














                                  SURVEY CONTROL DATA
                                
                             STATE=DC
                             [FEBRUARY 21, 2026 01]
                    PROGRAM = datasheet95, VERSION = 8.12.5.20
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1905 ***********************************************************************
 HV1905  DESIGNATION -  1
 HV1905  PID         -  HV1905
 HV1905  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1905  COUNTRY     -  US
 HV1905  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1905
 HV1905                         *CURRENT SURVEY CONTROL
 HV1905  ______________________________________________________________________
 HV1905* NAD 83(1986) POSITION- 38 56 35.     (N) 077 03 54.     (W)   SCALED
 HV1905* NAVD 88 ORTHO HEIGHT -    88.806 (meters)      291.36  (feet) ADJUSTED
 HV1905  ______________________________________________________________________
 HV1905  GEOID HEIGHT    -        -31.964 (meters)                     GEOID18
 HV1905  DYNAMIC HEIGHT  -         88.758 (meters)      291.20  (feet) COMP
 HV1905  MODELED GRAVITY -    980,083.1   (mgal)                       NAVD 88
 HV1905
 HV1905  VERT ORDER      -  SECOND    CLASS 0
 HV1905
 HV1905.The horizontal coordinates were scaled from a map and have
 HV1905.an estimated accuracy of +/- 6 seconds.
 HV1905
 HV1905.The orthometric height was determined by differential leveling and
 HV1905.adjusted by the NATIONAL GEODETIC SURVEY
 HV1905.in June 1991.
 HV1905
 HV1905.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1905.GEOID18 height accuracy estimate available here.
 HV1905
 HV1905.Click photographs - Photos may exist for this station.
 HV1905
 HV1905.The dynamic height is computed by dividing the NAVD 88
 HV1905.geopotential number by the normal gravity value computed on the
 HV1905.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1905.degrees latitude (g = 980.6199 gals.).
 HV1905
 HV1905.The modeled gravity was interpolated from observed gravity values.
 HV1905
 HV1905
 HV1905_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ210124(NAD 83)
 HV1905
 HV1905                          SUPERSEDED SURVEY CONTROL
 HV1905
 HV1905  NGVD 29 (11/26/84)   89.038  (m)          292.12   (f) ADJUSTED    2 0
 HV1905
 HV1905.Superseded values are not recommended for survey control.
 HV1905
 HV1905.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1905.See file dsdata.pdf to determine how the superseded data were derived.
 HV1905
 HV1905_MARKER: X = CHISELED CROSS
 HV1905_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1905_SP_SET: STEP
 HV1905_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1905
 HV1905  HISTORY     - Date     Condition        Report By
 HV1905  HISTORY     - UNK      MONUMENTED       CGS
 HV1905  HISTORY     - 1928     GOOD             CGS
 HV1905  HISTORY     - 1970     GOOD             NGS
 HV1905
 HV1905                          STATION DESCRIPTION
 HV1905
 HV1905'DESCRIBED BY COAST AND GEODETIC SURVEY 1928
 HV1905'IN WASHINGTON.
 HV1905'IN NORTHWEST WASHINGTON, AT THE NATIONAL BUREAU OF STANDARDS
 HV1905'(THESE GROUNDS ARE LOCATED WEST OF CONNECTICUT AVENUE AND NORTH
 HV1905'OF VAN NESS STREET NORTHWEST), AT THE SOUTH ENTRANCE TO THE
 HV1905'INDUSTRIAL BUILDING, AND ON THE RIGHT BACK CORNER OF THE TOP
 HV1905'STEP.  A CHISELED CROSS.
 HV1905
 HV1905                          STATION RECOVERY (1970)
 HV1905
 HV1905'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1970
 HV1905'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4500 ***********************************************************************
 HV4500  DESIGNATION -  1 LA
 HV4500  PID         -  HV4500
 HV4500  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4500  COUNTRY     -  US
 HV4500  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4500
 HV4500                         *CURRENT SURVEY CONTROL
 HV4500  ______________________________________________________________________
 HV4500* NAD 83(1993) POSITION- 38 53 32.97819(N) 077 00 44.62233(W)   ADJUSTED
 HV4500* NAVD 88 ORTHO HEIGHT -     4.82  (+/-2cm)       15.8   (feet) VERTCON3
 HV4500  ______________________________________________________________________
 HV4500  GEOID HEIGHT    -        -32.116 (meters)                     GEOID18
 HV4500  LAPLACE CORR    -         -3.26  (seconds)                    DEFLEC18
 HV4500  HORZ ORDER      -  SECOND
 HV4500  VERT ORDER      -  THIRD ? (See Below)
 HV4500
 HV4500.The horizontal coordinates were established by classical geodetic methods
 HV4500.and adjusted by the National Geodetic Survey in November 1994.
 HV4500
 HV4500.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4500.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4500
 HV4500.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4500.GEOID18 height accuracy estimate available here.
 HV4500
 HV4500.The vertical order pertains to the NGVD 29 superseded value.
 HV4500
 HV4500.Click photographs - Photos may exist for this station.
 HV4500
 HV4500.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4500
 HV4500. The following values were computed from the NAD 83(1993) position.
 HV4500
 HV4500;                    North         East     Units Scale Factor Converg.
 HV4500;SPC MD       -   136,072.142   398,924.689   MT  0.99994989   -0 00 28.0
 HV4500;SPC MD       -   446,430.02  1,308,805.42   sFT  0.99994989   -0 00 28.0
 HV4500;SPC VA N     - 2,137,112.523 3,629,049.817   MT  0.99995987   +0 55 42.4
 HV4500;SPC VA N     - 7,011,510.00 11,906,307.61   sFT  0.99995987   +0 55 42.4
 HV4500;UTM  18      - 4,306,771.443   325,472.116   MT  0.99997509   -1 15 49.8
 HV4500
 HV4500!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4500!SPC MD       -   1.00000428  x   0.99994989  =   0.99995417
 HV4500!SPC VA N     -   1.00000428  x   0.99995987  =   0.99996415
 HV4500!UTM  18      -   1.00000428  x   0.99997509  =   0.99997937
 HV4500
 HV4500:                Primary Azimuth Mark                     Grid Az
 HV4500:SPC MD       -  1 LA AZ MK                               248 13 39.5
 HV4500:SPC VA N     -  1 LA AZ MK                               247 17 29.1
 HV4500:UTM  18      -  1 LA AZ MK                               249 29 01.3
 HV4500
 HV4500_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2547206771(NAD 83)
 HV4500
 HV4500|---------------------------------------------------------------------|
 HV4500| PID    Reference Object                     Distance      Geod. Az  |
 HV4500|                                                           dddmmss.s |
 HV4500| HV4499 LA D                                360.744 METERS 04715     |
 HV4500| HV4501 3 PEN                               249.469 METERS 24624     |
 HV4500| DC6609 1 LA AZ MK                                         2481311.5 |
 HV4500|---------------------------------------------------------------------|
 HV4500
 HV4500                          SUPERSEDED SURVEY CONTROL
 HV4500
 HV4500  NAD 83(1991)-  38 53 32.97702(N)    077 00 44.62354(W) AD(       ) 2
 HV4500  NAD 83(1986)-  38 53 32.97648(N)    077 00 44.63427(W) AD(       ) 2
 HV4500  NAD 27      -  38 53 32.57586(N)    077 00 45.71633(W) AD(       ) 2
 HV4500  NGVD 29 (07/19/86)    5.06   (m)           16.6    (f) LEVELING    3  
 HV4500
 HV4500.Superseded values are not recommended for survey control.
 HV4500
 HV4500.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4500.See file dsdata.pdf to determine how the superseded data were derived.
 HV4500
 HV4500_MARKER: DD = SURVEY DISK
 HV4500_SETTING: 0 = UNSPECIFIED SETTING
 HV4500
 HV4500  HISTORY     - Date     Condition        Report By
 HV4500  HISTORY     - 1981     MONUMENTED       CANDA
 HV4500  HISTORY     - 20020811 GOOD             INDIV
 HV4500  HISTORY     - 20100314 GOOD             GEOCAC
 HV4500
 HV4500                          STATION DESCRIPTION
 HV4500
 HV4500'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4500'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4500'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4500'
 HV4500'STATION IS LOCATED IN THE CONCRETE SIDEWALK ON THE SOUTHWEST CORNER
 HV4500'OF FIRST STREET N.W. AND LOUISIANA AVE. N.W.
 HV4500'
 HV4500'STATION IS 35.39 FT. WNW OF X ON NORTH RIM OF PEPCO M.H. IN SIDEWALK
 HV4500'ON FIRST STREET N.W.
 HV4500'
 HV4500'STATION IS 36.81 FT. W OF SIGNAL POST BASE.
 HV4500'
 HV4500'STATION IS 14.33 FT. E OF NAIL AND WASHER IN 12 INCH OAK.
 HV4500
 HV4500                          STATION RECOVERY (2002)
 HV4500
 HV4500'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 HV4500'DISC INSCRIBED PADC. NAIL AND WASHER NOT FOUND IN OAK TREE, OTHER
 HV4500'LANDMARKS IN 1981 RECOVERY NOTE ARE AS DESCRIBED.
 HV4500
 HV4500                          STATION RECOVERY (2010)
 HV4500
 HV4500'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 HV4500'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1407 ***********************************************************************
 HV1407  DESIGNATION -  1 WNY
 HV1407  PID         -  HV1407
 HV1407  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1407  COUNTRY     -  US
 HV1407  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1407
 HV1407                         *CURRENT SURVEY CONTROL
 HV1407  ______________________________________________________________________
 HV1407* NAD 83(1986) POSITION- 38 52 31.6    (N) 076 59 33.1    (W)   HD_HELD2
 HV1407* NAVD 88 ORTHO HEIGHT -    11.370 (meters)       37.30  (feet) ADJUSTED
 HV1407  ______________________________________________________________________
 HV1407  GEOID HEIGHT    -        -32.184 (meters)                     GEOID18
 HV1407  DYNAMIC HEIGHT  -         11.364 (meters)       37.28  (feet) COMP
 HV1407  MODELED GRAVITY -    980,096.4   (mgal)                       NAVD 88
 HV1407
 HV1407  VERT ORDER      -  FIRST     CLASS II
 HV1407
 HV1407.The horizontal coordinates were established by autonomous hand held GPS
 HV1407.observations and have an estimated accuracy of +/- 10 meters.
 HV1407
 HV1407.The orthometric height was determined by differential leveling and
 HV1407.adjusted by the NATIONAL GEODETIC SURVEY
 HV1407.in June 1991.
 HV1407
 HV1407.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1407.GEOID18 height accuracy estimate available here.
 HV1407
 HV1407.Click photographs - Photos may exist for this station.
 HV1407
 HV1407.The dynamic height is computed by dividing the NAVD 88
 HV1407.geopotential number by the normal gravity value computed on the
 HV1407.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1407.degrees latitude (g = 980.6199 gals.).
 HV1407
 HV1407.The modeled gravity was interpolated from observed gravity values.
 HV1407
 HV1407
 HV1407_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2715304841(NAD 83)
 HV1407
 HV1407                          SUPERSEDED SURVEY CONTROL
 HV1407
 HV1407  NGVD 29 (11/26/84)   11.610  (m)           38.09   (f) ADJUSTED    1 2
 HV1407
 HV1407.Superseded values are not recommended for survey control.
 HV1407
 HV1407.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1407.See file dsdata.pdf to determine how the superseded data were derived.
 HV1407
 HV1407_MARKER: DD = SURVEY DISK
 HV1407_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1407_SP_SET: PAVEMENT
 HV1407_STAMPING: 1
 HV1407_MARK LOGO: WASNAV
 HV1407_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1407_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1407_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1407+SATELLITE: SATELLITE OBSERVATIONS - June 10, 2013
 HV1407
 HV1407  HISTORY     - Date     Condition        Report By
 HV1407  HISTORY     - UNK      MONUMENTED       USACE
 HV1407  HISTORY     - 1923     GOOD             CGS
 HV1407  HISTORY     - 1955     GOOD             CGS
 HV1407  HISTORY     - 20010716 GOOD             NGS
 HV1407  HISTORY     - 20120315 GOOD             GEOCAC
 HV1407  HISTORY     - 20130610 GOOD             GEOMET
 HV1407
 HV1407                          STATION DESCRIPTION
 HV1407
 HV1407'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1407'IN WASHINGTON.
 HV1407'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN
 HV1407'FACTORY, ON TENTH STREET, IN THE PAVEMENT OF THE EAST END OF
 HV1407'BUILDING 157, AT THE NORTH END OF A LARGE DOORWAY, 1.2 FEET
 HV1407'SOUTH OF THE NORTH EDGE OF THE DOORWAY, AND 1.7 FEET EAST OF THE
 HV1407'STEEL DOOR.  A WASHINGTON NAVY YARD STANDARD DISK, STAMPED 1.
 HV1407
 HV1407                          STATION RECOVERY (1955)
 HV1407
 HV1407'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1407'RECOVERED IN GOOD CONDITION.
 HV1407
 HV1407                          STATION RECOVERY (2001)
 HV1407
 HV1407'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 HV1407'RECOVERED AS DESCRIBED.
 HV1407
 HV1407                          STATION RECOVERY (2012)
 HV1407
 HV1407'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV1407'RECOVERED IN GOOD CONDITION.
 HV1407
 HV1407                          STATION RECOVERY (2013)
 HV1407
 HV1407'RECOVERY NOTE BY GEOMETRICS GPS INCORPORATED 2013 (DWB)
 HV1407'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1994 ***********************************************************************
 HV1994  DESIGNATION -  10.72=EP 1
 HV1994  PID         -  HV1994
 HV1994  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1994  COUNTRY     -  US
 HV1994  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1994
 HV1994                         *CURRENT SURVEY CONTROL
 HV1994  ______________________________________________________________________
 HV1994* NAD 83(1986) POSITION- 38 52 37.9    (N) 077 02 10.7    (W)   HD_HELD2
 HV1994* NAVD 88 ORTHO HEIGHT -     2.544 (meters)        8.35  (feet) ADJUSTED
 HV1994  ______________________________________________________________________
 HV1994  GEOID HEIGHT    -        -32.111 (meters)                     GEOID18
 HV1994  DYNAMIC HEIGHT  -          2.543 (meters)        8.34  (feet) COMP
 HV1994  MODELED GRAVITY -    980,096.8   (mgal)                       NAVD 88
 HV1994
 HV1994  VERT ORDER      -  FIRST     CLASS II
 HV1994
 HV1994.The horizontal coordinates were established by autonomous hand held GPS
 HV1994.observations and have an estimated accuracy of +/- 10 meters.
 HV1994
 HV1994.The orthometric height was determined by differential leveling and
 HV1994.adjusted by the NATIONAL GEODETIC SURVEY
 HV1994.in October 2012.
 HV1994
 HV1994.No vertical observational check was made to the station.
 HV1994
 HV1994.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1994.GEOID18 height accuracy estimate available here.
 HV1994
 HV1994.Click photographs - Photos may exist for this station.
 HV1994
 HV1994.The dynamic height is computed by dividing the NAVD 88
 HV1994.geopotential number by the normal gravity value computed on the
 HV1994.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1994.degrees latitude (g = 980.6199 gals.).
 HV1994
 HV1994.The modeled gravity was interpolated from observed gravity values.
 HV1994
 HV1994
 HV1994_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2336005119(NAD 83)
 HV1994
 HV1994                          SUPERSEDED SURVEY CONTROL
 HV1994
 HV1994  NAVD 88 (04/20/10)    2.548  (m)            8.36   (f) SUPERSEDED  1 2
 HV1994  NAVD 88 (06/15/91)    2.555  (m)            8.38   (f) SUPERSEDED  1 1
 HV1994  NGVD 29 (11/26/84)    2.792  (m)            9.16   (f) ADJUSTED    1 1
 HV1994
 HV1994.Superseded values are not recommended for survey control.
 HV1994
 HV1994.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1994.See file dsdata.pdf to determine how the superseded data were derived.
 HV1994
 HV1994_MARKER: B = BOLT
 HV1994_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1994_SP_SET: RAILROAD BRIDGE FOUNDATION
 HV1994_MARK LOGO: NONE
 HV1994_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1994_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1994+SATELLITE: SATELLITE OBSERVATIONS - March 01, 2012
 HV1994
 HV1994  HISTORY     - Date     Condition        Report By
 HV1994  HISTORY     - UNK      MONUMENTED       USACE
 HV1994  HISTORY     - 1971     GOOD             NGS
 HV1994  HISTORY     - 20070928 GOOD             NGS
 HV1994  HISTORY     - 20081222 GOOD             NGS
 HV1994  HISTORY     - 20120301 GOOD             NGS
 HV1994
 HV1994                          STATION DESCRIPTION
 HV1994
 HV1994'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1994'AT WASHINGTON.
 HV1994'AT WASHINGTON, D.C., AT THE NORTHEAST END OF THE RICHMOND,
 HV1994'FREDERICKSBURG AND POTOMAC RAILROAD BRIDGE OVER THE POTOMAC
 HV1994'RIVER AT EAST POTOMAC PARK, 19 1/2 FEET NORTHEAST OF THE
 HV1994'CENTER LINE OF OHIO DRIVE WHICH LEADS SOUTHEAST TO HAINES
 HV1994'POINT, 2.6 FEET NORTHWEST OF THE SOUTH CORNER OF THE STONE
 HV1994'FOUNDATION FOR THE BRIDGE, ABOUT 17 FEET BELOW THE LEVEL OF THE
 HV1994'TRACK, ABOUT 1 1/2 FEET ABOVE THE LEVEL OF THE GROUND, AND
 HV1994'IS A 3/4-INCH METAL BOLT SET IN THE SOUTHWEST FACE OF THE
 HV1994'FOUNDATION AND IS SURROUNDED BY THE LETTERS USBM 10.72 CUT IN
 HV1994'THE STONE.  NOTE-- 12.1 FEET SOUTHEAST OF BENCH MARK EP 10.
 HV1994
 HV1994                          STATION RECOVERY (2007)
 HV1994
 HV1994'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2007 (DRD)
 HV1994'RECOVERED IN GOOD CONDITION.
 HV1994
 HV1994                          STATION RECOVERY (2008)
 HV1994
 HV1994'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV1994'RECOVERED AS DESCRIBED.
 HV1994
 HV1994                          STATION RECOVERY (2012)
 HV1994
 HV1994'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1994'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1402 ***********************************************************************
 HV1402  TIDAL BM    -  This is a Tidal Bench Mark.
 HV1402  DESIGNATION -  101 WNY RESET 1955
 HV1402  PID         -  HV1402
 HV1402  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1402  COUNTRY     -  US
 HV1402  USGS QUAD   -  ANACOSTIA (2016)
 HV1402
 HV1402                         *CURRENT SURVEY CONTROL
 HV1402  ______________________________________________________________________
 HV1402* NAD 83(1986) POSITION- 38 52 22.     (N) 076 59 39.     (W)   SCALED
 HV1402* NAVD 88 ORTHO HEIGHT -     4.19  (+/-2cm)       13.7   (feet) VERTCON3
 HV1402  ______________________________________________________________________
 HV1402  GEOID HEIGHT    -        -32.186 (meters)                     GEOID18
 HV1402  VERT ORDER      -  ? (See Below)
 HV1402
 HV1402.The horizontal coordinates were scaled from a map and have
 HV1402.an estimated accuracy of +/- 6 seconds.
 HV1402
 HV1402.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1402.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1402
 HV1402.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1402.GEOID18 height accuracy estimate available here.
 HV1402
 HV1402.The vertical order pertains to the NGVD 29 superseded value.
 HV1402
 HV1402.This Tidal Bench Mark is designated as VM 12742
 HV1402.by the CENTER FOR OPERATIONAL OCEANOGRAPHIC PRODUCTS AND SERVICES.
 HV1402
 HV1402.Click photographs - Photos may exist for this station.
 HV1402
 HV1402
 HV1402_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ270045(NAD 83)
 HV1402
 HV1402                          SUPERSEDED SURVEY CONTROL
 HV1402
 HV1402  NGVD 29 (11/26/84)    4.436  (m)           14.55   (f) ADJUSTED       
 HV1402
 HV1402.Superseded values are not recommended for survey control.
 HV1402
 HV1402.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1402.See file dsdata.pdf to determine how the superseded data were derived.
 HV1402
 HV1402_MARKER: DD = SURVEY DISK
 HV1402_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1402_SP_SET: RETAINING WALL
 HV1402_STAMPING: NO 101 1940
 HV1402_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1402
 HV1402  HISTORY     - Date     Condition        Report By
 HV1402  HISTORY     - 1955     MONUMENTED       USACE
 HV1402  HISTORY     - 1955     GOOD             CGS
 HV1402  HISTORY     - 19950811 GOOD             USPSQD
 HV1402
 HV1402                          STATION DESCRIPTION
 HV1402
 HV1402'DESCRIBED BY COAST AND GEODETIC SURVEY 1955
 HV1402'IN WASHINGTON.
 HV1402'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN
 HV1402'FACTORY, ON PARSONS AVENUE, SOUTH OF BUILDING 101, EAST OF THE
 HV1402'NORTHEAST CORNER OF BUILDING 130, IN THE TOP OF A BRICK
 HV1402'RETAINING WALL (OLD YARD WALL), AND 1 FOOT SOUTH OF THE NORTH
 HV1402'END OF THE WALL.  A WASHINGTON NAVY YARD STANDARD DISK, STAMPED
 HV1402'NO 101 1940.
 HV1402
 HV1402                          STATION RECOVERY (1995)
 HV1402
 HV1402'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1402'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1782 ***********************************************************************
 HV1782  DESIGNATION -  1015
 HV1782  PID         -  HV1782
 HV1782  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1782  COUNTRY     -  US
 HV1782  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1782
 HV1782                         *CURRENT SURVEY CONTROL
 HV1782  ______________________________________________________________________
 HV1782* NAD 83(1986) POSITION- 38 58 22.     (N) 077 00 58.     (W)   SCALED
 HV1782* NAVD 88 ORTHO HEIGHT -    82.553 (meters)      270.84  (feet) ADJUSTED
 HV1782  ______________________________________________________________________
 HV1782  GEOID HEIGHT    -        -32.001 (meters)                     GEOID18
 HV1782  DYNAMIC HEIGHT  -         82.509 (meters)      270.70  (feet) COMP
 HV1782  MODELED GRAVITY -    980,093.8   (mgal)                       NAVD 88
 HV1782
 HV1782  VERT ORDER      -  FIRST     CLASS II
 HV1782
 HV1782.The horizontal coordinates were scaled from a map and have
 HV1782.an estimated accuracy of +/- 6 seconds.
 HV1782
 HV1782.The orthometric height was determined by differential leveling and
 HV1782.adjusted by the NATIONAL GEODETIC SURVEY
 HV1782.in June 1991.
 HV1782
 HV1782.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1782.GEOID18 height accuracy estimate available here.
 HV1782
 HV1782.Click photographs - Photos may exist for this station.
 HV1782
 HV1782.The dynamic height is computed by dividing the NAVD 88
 HV1782.geopotential number by the normal gravity value computed on the
 HV1782.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1782.degrees latitude (g = 980.6199 gals.).
 HV1782
 HV1782.The modeled gravity was interpolated from observed gravity values.
 HV1782
 HV1782
 HV1782_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ253156(NAD 83)
 HV1782
 HV1782                          SUPERSEDED SURVEY CONTROL
 HV1782
 HV1782  NGVD 29 (11/26/84)   82.768  (m)          271.55   (f) ADJUSTED    1 2
 HV1782
 HV1782.Superseded values are not recommended for survey control.
 HV1782
 HV1782.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1782.See file dsdata.pdf to determine how the superseded data were derived.
 HV1782
 HV1782_MARKER: Z = SEE DESCRIPTION
 HV1782_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1782_SP_SET: STEP
 HV1782_STAMPING: WSSC 1015
 HV1782_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1782
 HV1782  HISTORY     - Date     Condition        Report By
 HV1782  HISTORY     - UNK      MONUMENTED       WSSC
 HV1782  HISTORY     - 1933     GOOD             CGS
 HV1782  HISTORY     - 1951     GOOD             CGS
 HV1782  HISTORY     - 19900406 MARK NOT FOUND   NGS
 HV1782
 HV1782                          STATION DESCRIPTION
 HV1782
 HV1782'DESCRIBED BY COAST AND GEODETIC SURVEY 1933
 HV1782'NEAR TAKOMA PARK.
 HV1782'ABOUT 1000 FEET SOUTH ALONG THE METROPOLITAN BRANCH OF THE
 HV1782'BALTIMORE AND OHIO RAILROAD FROM TAKOMA PARK, D.C., AT THE BRIDGE
 HV1782'OVER APSEN STREET, AT THE SOUTH CONCRETE ABUTMENT, IN THE
 HV1782'SOUTHWEST CORNER OF THE TOP STEP OF THE WEST WING WALL, AND 12
 HV1782'FEET WEST OF THE CENTERLINE OF THE SOUTHBOUND TRACK.  A WASHINGTON
 HV1782'SUBURBAN SANITARY DISTRICT STANDARD COPPER LAG SCREW AND WASHER,
 HV1782'STAMPED WSSC 1015.
 HV1782
 HV1782                          STATION RECOVERY (1951)
 HV1782
 HV1782'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1951
 HV1782'RECOVERED IN GOOD CONDITION.
 HV1782
 HV1782                          STATION RECOVERY (1990)
 HV1782
 HV1782'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990
 HV1782'A THOROUGH SEARCH OF THE DESCRIBED AREA REVEALED NO EVIDENCE OF THE
 HV1782'MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1781 ***********************************************************************
 HV1781  DESIGNATION -  1016 WSSC
 HV1781  PID         -  HV1781
 HV1781  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1781  COUNTRY     -  US
 HV1781  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1781
 HV1781                         *CURRENT SURVEY CONTROL
 HV1781  ______________________________________________________________________
 HV1781* NAD 83(1986) POSITION- 38 57 45.     (N) 077 00 26.     (W)   SCALED
 HV1781* NAVD 88 ORTHO HEIGHT -    70.986 (meters)      232.89  (feet) ADJUSTED
 HV1781  ______________________________________________________________________
 HV1781  GEOID HEIGHT    -        -32.020 (meters)                     GEOID18
 HV1781  DYNAMIC HEIGHT  -         70.949 (meters)      232.77  (feet) COMP
 HV1781  MODELED GRAVITY -    980,101.1   (mgal)                       NAVD 88
 HV1781
 HV1781  VERT ORDER      -  FIRST     CLASS II
 HV1781
 HV1781.The horizontal coordinates were scaled from a map and have
 HV1781.an estimated accuracy of +/- 6 seconds.
 HV1781
 HV1781.The orthometric height was determined by differential leveling and
 HV1781.adjusted by the NATIONAL GEODETIC SURVEY
 HV1781.in June 1991.
 HV1781
 HV1781.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1781.GEOID18 height accuracy estimate available here.
 HV1781
 HV1781.Click photographs - Photos may exist for this station.
 HV1781
 HV1781.The dynamic height is computed by dividing the NAVD 88
 HV1781.geopotential number by the normal gravity value computed on the
 HV1781.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1781.degrees latitude (g = 980.6199 gals.).
 HV1781
 HV1781.The modeled gravity was interpolated from observed gravity values.
 HV1781
 HV1781
 HV1781_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ260145(NAD 83)
 HV1781
 HV1781                          SUPERSEDED SURVEY CONTROL
 HV1781
 HV1781  NGVD 29 (11/26/84)   71.205  (m)          233.61   (f) ADJUSTED    1 2
 HV1781
 HV1781.Superseded values are not recommended for survey control.
 HV1781
 HV1781.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1781.See file dsdata.pdf to determine how the superseded data were derived.
 HV1781
 HV1781_MARKER: Z = SEE DESCRIPTION
 HV1781_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1781_SP_SET: SIGNAL FOUNDATION
 HV1781_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1781
 HV1781  HISTORY     - Date     Condition        Report By
 HV1781  HISTORY     - UNK      MONUMENTED       WSSC
 HV1781  HISTORY     - 1943     GOOD             CGS
 HV1781
 HV1781                          STATION DESCRIPTION
 HV1781
 HV1781'DESCRIBED BY COAST AND GEODETIC SURVEY 1943
 HV1781'IN WASHINGTON.
 HV1781'ABOUT 1 MILE SOUTH ALONG THE METROPOLITAN BRANCH OF THE BALTIMORE
 HV1781'AND OHIO RR FROM TAKOMA PARK, D.C., ABOUT 1/2 MILE SOUTH OF LAMOND
 HV1781'STATION, AT THE SITE OF FORMER SIGNAL POST W 5-11, 8.8 FEET EAST
 HV1781'OF THE CENTER LINE OF THE NORTHBOUND TRACK, 102 FEET SOUTH OF
 HV1781'A WHISTLE POST LOCATED ON EAST SIDE OF TRACK, ACROSS THE TRACKS
 HV1781'FROM A SQUARE CONCRETE BATTERY WELL, IN A CUT, AT FORMER SITE
 HV1781'OF OVERPASS FOR ROAD LEADING TO MASONIC AND EASTERN STAR HOME
 HV1781'(NOW ABANDONED SINCE APPROACH IS FROM N.H. AVE.), ABOVE SAME ELEV.
 HV1781'AS BASE OF RAIL (MAYBE 3 OR 4 INCHES LOWER), 1-1/2 POLES N OF
 HV1781'POLE 5-10, IN NW PART OF OLD SIGNAL FOUNDATION, 3 INCHES FROM
 HV1781'CIRCULAR MARK IN CONCRETE LEFT BY BASE OF FORMER BLOCK SIGNAL
 HV1781'COLUMN, 16-3/4 RAILS (1943) N. OF N. SIDE OF N.H. AVENUE OVERPASS.
 HV1781'COPPER SCREW AND WASHER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1914 ***********************************************************************
 HV1914  DESIGNATION -  11
 HV1914  PID         -  HV1914
 HV1914  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1914  COUNTRY     -  US
 HV1914  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1914
 HV1914                         *CURRENT SURVEY CONTROL
 HV1914  ______________________________________________________________________
 HV1914* NAD 83(1986) POSITION- 38 56 40.     (N) 077 04 06.     (W)   SCALED
 HV1914* NAVD 88 ORTHO HEIGHT -   102.125 (meters)      335.06  (feet) ADJUSTED
 HV1914  ______________________________________________________________________
 HV1914  GEOID HEIGHT    -        -31.957 (meters)                     GEOID18
 HV1914  DYNAMIC HEIGHT  -        102.069 (meters)      334.87  (feet) COMP
 HV1914  MODELED GRAVITY -    980,082.8   (mgal)                       NAVD 88
 HV1914
 HV1914  VERT ORDER      -  SECOND    CLASS 0
 HV1914
 HV1914.The horizontal coordinates were scaled from a map and have
 HV1914.an estimated accuracy of +/- 6 seconds.
 HV1914
 HV1914.The orthometric height was determined by differential leveling and
 HV1914.adjusted by the NATIONAL GEODETIC SURVEY
 HV1914.in June 1991.
 HV1914
 HV1914.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1914.GEOID18 height accuracy estimate available here.
 HV1914
 HV1914.Click photographs - Photos may exist for this station.
 HV1914
 HV1914.The dynamic height is computed by dividing the NAVD 88
 HV1914.geopotential number by the normal gravity value computed on the
 HV1914.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1914.degrees latitude (g = 980.6199 gals.).
 HV1914
 HV1914.The modeled gravity was interpolated from observed gravity values.
 HV1914
 HV1914
 HV1914_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ207126(NAD 83)
 HV1914
 HV1914                          SUPERSEDED SURVEY CONTROL
 HV1914
 HV1914  NGVD 29 (11/26/84)  102.357  (m)          335.82   (f) ADJUSTED    2 0
 HV1914
 HV1914.Superseded values are not recommended for survey control.
 HV1914
 HV1914.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1914.See file dsdata.pdf to determine how the superseded data were derived.
 HV1914
 HV1914_MARKER: Z = SEE DESCRIPTION
 HV1914_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1914_SP_SET: BUILDING
 HV1914_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1914
 HV1914  HISTORY     - Date     Condition        Report By
 HV1914  HISTORY     - UNK      MONUMENTED       CGS
 HV1914  HISTORY     - 1928     GOOD             CGS
 HV1914  HISTORY     - 1970     MARK NOT FOUND   NGS
 HV1914
 HV1914                          STATION DESCRIPTION
 HV1914
 HV1914'DESCRIBED BY COAST AND GEODETIC SURVEY 1928
 HV1914'IN WASHINGTON.
 HV1914'IN NORTHWEST WASHINGTON, AT THE NATIONAL BUREAU OF STANDARDS, IN
 HV1914'THE NORTH WALL OF THE NORTH BUILDING, EAST OF THE NORTH ENTRANCE,
 HV1914'AND 3 FEET ABOVE THE GROUND.  THE CENTER OF A 1/4-INCH BRASS
 HV1914'ROD SET FLUSH WITH THE FACE OF THE WALL.
 HV1914
 HV1914                          STATION RECOVERY (1970)
 HV1914
 HV1914'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1970
 HV1914'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4514 ***********************************************************************
 HV4514  DESIGNATION -  11 E
 HV4514  PID         -  HV4514
 HV4514  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4514  COUNTRY     -  US
 HV4514  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4514
 HV4514                         *CURRENT SURVEY CONTROL
 HV4514  ______________________________________________________________________
 HV4514* NAD 83(1993) POSITION- 38 53 45.74727(N) 077 01 37.98903(W)   ADJUSTED
 HV4514* NAVD 88 ORTHO HEIGHT -     5.25  (+/-2cm)       17.2   (feet) VERTCON3
 HV4514  ______________________________________________________________________
 HV4514  GEOID HEIGHT    -        -32.085 (meters)                     GEOID18
 HV4514  LAPLACE CORR    -         -2.69  (seconds)                    DEFLEC18
 HV4514  HORZ ORDER      -  SECOND
 HV4514  VERT ORDER      -  THIRD ? (See Below)
 HV4514
 HV4514.The horizontal coordinates were established by classical geodetic methods
 HV4514.and adjusted by the National Geodetic Survey in November 1994.
 HV4514
 HV4514.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4514.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4514
 HV4514.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4514.GEOID18 height accuracy estimate available here.
 HV4514
 HV4514.The vertical order pertains to the NGVD 29 superseded value.
 HV4514
 HV4514.Click photographs - Photos may exist for this station.
 HV4514
 HV4514.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4514
 HV4514. The following values were computed from the NAD 83(1993) position.
 HV4514
 HV4514;                    North         East     Units Scale Factor Converg.
 HV4514;SPC MD       -   136,466.163   397,638.773   MT  0.99994991   -0 01 01.5
 HV4514;SPC MD       -   447,722.74  1,304,586.54   sFT  0.99994991   -0 01 01.5
 HV4514;SPC VA N     - 2,137,485.483 3,627,757.622   MT  0.99996017   +0 55 09.1
 HV4514;SPC VA N     - 7,012,733.62 11,902,068.13   sFT  0.99996017   +0 55 09.1
 HV4514;UTM  18      - 4,307,193.570   324,195.111   MT  0.99998060   -1 16 23.6
 HV4514
 HV4514!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4514!SPC MD       -   1.00000421  x   0.99994991  =   0.99995412
 HV4514!SPC VA N     -   1.00000421  x   0.99996017  =   0.99996438
 HV4514!UTM  18      -   1.00000421  x   0.99998060  =   0.99998481
 HV4514
 HV4514:                Primary Azimuth Mark                     Grid Az
 HV4514:SPC MD       -  11 E AZ MK                               078 42 29.8
 HV4514:SPC VA N     -  11 E AZ MK                               077 46 19.2
 HV4514:UTM  18      -  11 E AZ MK                               079 57 51.9
 HV4514
 HV4514_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2419507193(NAD 83)
 HV4514
 HV4514|---------------------------------------------------------------------|
 HV4514| PID    Reference Object                     Distance      Geod. Az  |
 HV4514|                                                           dddmmss.s |
 HV4514| DC6610 11 E AZ MK                                         0784128.3 |
 HV4514| HV4510 9 E                                 270.176 METERS 09016     |
 HV4514| HV4513 11 PEN                              174.709 METERS 17227     |
 HV4514| HV4516 13 E                                195.496 METERS 26950     |
 HV4514|---------------------------------------------------------------------|
 HV4514
 HV4514                          SUPERSEDED SURVEY CONTROL
 HV4514
 HV4514  NAD 83(1991)-  38 53 45.74612(N)    077 01 37.99027(W) AD(       ) 2
 HV4514  NAD 83(1986)-  38 53 45.74565(N)    077 01 38.00089(W) AD(       ) 2
 HV4514  NAD 27      -  38 53 45.34605(N)    077 01 39.08104(W) AD(       ) 2
 HV4514  NGVD 29 (07/19/86)    5.49   (m)           18.0    (f) LEVELING    3  
 HV4514
 HV4514.Superseded values are not recommended for survey control.
 HV4514
 HV4514.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4514.See file dsdata.pdf to determine how the superseded data were derived.
 HV4514
 HV4514_MARKER: DD = SURVEY DISK
 HV4514_SETTING: 0 = UNSPECIFIED SETTING
 HV4514
 HV4514  HISTORY     - Date     Condition        Report By
 HV4514  HISTORY     - 1981     MONUMENTED       CANDA
 HV4514
 HV4514                          STATION DESCRIPTION
 HV4514
 HV4514'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4514'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE
 HV4514'LETTER C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4514'
 HV4514'STATION IS LOCATED IN THE CONCRETE SIDEWALK ON THE SOUTHWEST CORNER
 HV4514'OF 11TH STREET N.W. AND E STREET N.W.
 HV4514'
 HV4514'STATION IS 11.18 FT N OF SIGNAL POST BASE ON 11TH STREET.
 HV4514'
 HV4514'STATION IS 29.75 FT SW OF X ON RIM OF MANHOLE IN STREET.
 HV4514'
 HV4514'STATION IS 22.71 FT E OF PARKING METER ON E STREET.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4513 ***********************************************************************
 HV4513  DESIGNATION -  11 PEN
 HV4513  PID         -  HV4513
 HV4513  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4513  COUNTRY     -  US
 HV4513  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4513
 HV4513                         *CURRENT SURVEY CONTROL
 HV4513  ______________________________________________________________________
 HV4513* NAD 83(1993) POSITION- 38 53 40.13075(N) 077 01 37.03742(W)   ADJUSTED
 HV4513* NAVD 88 ORTHO HEIGHT -     3.91  (+/-2cm)       12.8   (feet) VERTCON3
 HV4513  ______________________________________________________________________
 HV4513  GEOID HEIGHT    -        -32.089 (meters)                     GEOID18
 HV4513  LAPLACE CORR    -         -2.71  (seconds)                    DEFLEC18
 HV4513  HORZ ORDER      -  SECOND
 HV4513  VERT ORDER      -  THIRD ? (See Below)
 HV4513
 HV4513.The horizontal coordinates were established by classical geodetic methods
 HV4513.and adjusted by the National Geodetic Survey in November 1994.
 HV4513
 HV4513.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4513.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4513
 HV4513.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4513.GEOID18 height accuracy estimate available here.
 HV4513
 HV4513.The vertical order pertains to the NGVD 29 superseded value.
 HV4513
 HV4513.Click photographs - Photos may exist for this station.
 HV4513
 HV4513.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4513
 HV4513. The following values were computed from the NAD 83(1993) position.
 HV4513
 HV4513;                    North         East     Units Scale Factor Converg.
 HV4513;SPC MD       -   136,292.967   397,661.652   MT  0.99994990   -0 01 00.9
 HV4513;SPC MD       -   447,154.51  1,304,661.60   sFT  0.99994990   -0 01 00.9
 HV4513;SPC VA N     - 2,137,312.683 3,627,783.329   MT  0.99996004   +0 55 09.7
 HV4513;SPC VA N     - 7,012,166.69 11,902,152.47   sFT  0.99996004   +0 55 09.7
 HV4513;UTM  18      - 4,307,019.909   324,214.189   MT  0.99998051   -1 16 22.9
 HV4513
 HV4513!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4513!SPC MD       -   1.00000442  x   0.99994990  =   0.99995432
 HV4513!SPC VA N     -   1.00000442  x   0.99996004  =   0.99996446
 HV4513!UTM  18      -   1.00000442  x   0.99998051  =   0.99998493
 HV4513
 HV4513:                Primary Azimuth Mark                     Grid Az
 HV4513:SPC MD       -  11 PEN AZ MK                             093 16 24.9
 HV4513:SPC VA N     -  11 PEN AZ MK                             092 20 14.3
 HV4513:UTM  18      -  11 PEN AZ MK                             094 31 46.9
 HV4513
 HV4513_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2421407019(NAD 83)
 HV4513
 HV4513|---------------------------------------------------------------------|
 HV4513| PID    Reference Object                     Distance      Geod. Az  |
 HV4513|                                                           dddmmss.s |
 HV4513| DC6611 11 PEN AZ MK                                       0931524.0 |
 HV4513| HV4511 9 PEN                               248.163 METERS 09947     |
 HV4513| HV4517 WP                                  374.513 METERS 29232     |
 HV4513| HV4514 11 E                                174.709 METERS 35227     |
 HV4513|---------------------------------------------------------------------|
 HV4513
 HV4513                          SUPERSEDED SURVEY CONTROL
 HV4513
 HV4513  NAD 83(1991)-  38 53 40.12960(N)    077 01 37.03866(W) AD(       ) 2
 HV4513  NAD 83(1986)-  38 53 40.12912(N)    077 01 37.04931(W) AD(       ) 2
 HV4513  NAD 27      -  38 53 39.72946(N)    077 01 38.12963(W) AD(       ) 2
 HV4513  NGVD 29 (07/19/86)    4.15   (m)           13.6    (f) LEVELING    3  
 HV4513
 HV4513.Superseded values are not recommended for survey control.
 HV4513
 HV4513.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4513.See file dsdata.pdf to determine how the superseded data were derived.
 HV4513
 HV4513_MARKER: DD = SURVEY DISK
 HV4513
 HV4513  HISTORY     - Date     Condition        Report By
 HV4513  HISTORY     - 1981     MONUMENTED       CANDA
 HV4513  HISTORY     - 20180718 GOOD             USPSQD
 HV4513
 HV4513                          STATION DESCRIPTION
 HV4513
 HV4513'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4513'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4513'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4513'
 HV4513'STATION IS LOCATED IN THE SIDEWALK ON THE SOUTHEAST CORNER OF 11TH
 HV4513'STREET N.W. AND PENNSYLVANIA AVE. N.W.
 HV4513'
 HV4513'STATION IS 16.16 FT N OF X IN M.H. RIM ON 11TH STREET.
 HV4513'
 HV4513'STATION IS 5.48 FT SW OF X IN M.H. RIM ON PA. AVE.
 HV4513'
 HV4513'STATION IS 5.80 FT SE OF CONC. BASE SIGNAL CONTROL BOX.
 HV4513
 HV4513                          STATION RECOVERY (2018)
 HV4513
 HV4513'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV4513'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1364 ***********************************************************************
 HV1364  DESIGNATION -  1102 WSSC
 HV1364  PID         -  HV1364
 HV1364  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1364  COUNTRY     -  US
 HV1364  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1364
 HV1364                         *CURRENT SURVEY CONTROL
 HV1364  ______________________________________________________________________
 HV1364* NAD 83(1986) POSITION- 38 56 47.     (N) 076 58 41.     (W)   SCALED
 HV1364* NAVD 88 ORTHO HEIGHT -    25.04  (+/-2cm)       82.2   (feet) VERTCON3
 HV1364  ______________________________________________________________________
 HV1364  GEOID HEIGHT    -        -32.084 (meters)                     GEOID18
 HV1364  VERT ORDER      -  SECOND    CLASS 0 (See Below)
 HV1364
 HV1364.The horizontal coordinates were scaled from a map and have
 HV1364.an estimated accuracy of +/- 6 seconds.
 HV1364
 HV1364.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1364.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1364
 HV1364.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1364.GEOID18 height accuracy estimate available here.
 HV1364
 HV1364.The vertical order pertains to the NGVD 29 superseded value.
 HV1364
 HV1364.Click photographs - Photos may exist for this station.
 HV1364
 HV1364
 HV1364_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ285126(NAD 83)
 HV1364
 HV1364                          SUPERSEDED SURVEY CONTROL
 HV1364
 HV1364  NGVD 29 (11/26/84)   25.262  (m)           82.88   (f) ADJUSTED    2 0
 HV1364
 HV1364.Superseded values are not recommended for survey control.
 HV1364
 HV1364.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1364.See file dsdata.pdf to determine how the superseded data were derived.
 HV1364
 HV1364_MARKER: Z = SEE DESCRIPTION
 HV1364_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1364_SP_SET: BOUNDARY STONE
 HV1364_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1364
 HV1364  HISTORY     - Date     Condition        Report By
 HV1364  HISTORY     - UNK      MONUMENTED       WSSC
 HV1364  HISTORY     - 1944     GOOD             WSSC
 HV1364
 HV1364                          STATION DESCRIPTION
 HV1364
 HV1364'DESCRIBED BY WASH SUBURB SAN COMM 1944
 HV1364'AT NORTH WOODRIDGE.
 HV1364'AT THE NORTHWEST CORNER OF THE INTERSECTION OF QUEENS CHAPEL
 HV1364'ROAD AND LA SALLE ROAD, 2 FEET OFF THE EDGE OF THE MACADAM,
 HV1364'NEAR THE NORTH END OF A CULVERT, AND ON A MD.-D.C. BOUNDARY
 HV1364'STONE.  NOTE-- THE CHARACTER OF THIS MARK IS UNKNOWN.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2040 ***********************************************************************
 HV2040  DESIGNATION -  1103 USE
 HV2040  PID         -  HV2040
 HV2040  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2040  COUNTRY     -  US
 HV2040  USGS QUAD   -  ALEXANDRIA (2019)
 HV2040
 HV2040                         *CURRENT SURVEY CONTROL
 HV2040  ______________________________________________________________________
 HV2040* NAD 83(1986) POSITION- 38 49 52.     (N) 077 01 32.     (W)   SCALED
 HV2040* NAVD 88 ORTHO HEIGHT -     1.409 (meters)        4.62  (feet) ADJUSTED
 HV2040  ______________________________________________________________________
 HV2040  GEOID HEIGHT    -        -32.202 (meters)                     GEOID18
 HV2040  DYNAMIC HEIGHT  -          1.408 (meters)        4.62  (feet) COMP
 HV2040  MODELED GRAVITY -    980,091.8   (mgal)                       NAVD 88
 HV2040
 HV2040  VERT ORDER      -  FIRST     CLASS II
 HV2040
 HV2040.The horizontal coordinates were scaled from a map and have
 HV2040.an estimated accuracy of +/- 6 seconds.
 HV2040
 HV2040.The orthometric height was determined by differential leveling and
 HV2040.adjusted by the NATIONAL GEODETIC SURVEY
 HV2040.in June 1991.
 HV2040
 HV2040.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2040.GEOID18 height accuracy estimate available here.
 HV2040
 HV2040.Click photographs - Photos may exist for this station.
 HV2040
 HV2040.The dynamic height is computed by dividing the NAVD 88
 HV2040.geopotential number by the normal gravity value computed on the
 HV2040.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2040.degrees latitude (g = 980.6199 gals.).
 HV2040
 HV2040.The modeled gravity was interpolated from observed gravity values.
 HV2040
 HV2040
 HV2040_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH241999(NAD 83)
 HV2040
 HV2040                          SUPERSEDED SURVEY CONTROL
 HV2040
 HV2040  NGVD 29 (11/26/84)    1.672  (m)            5.49   (f) ADJUSTED    1 2
 HV2040
 HV2040.Superseded values are not recommended for survey control.
 HV2040
 HV2040.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2040.See file dsdata.pdf to determine how the superseded data were derived.
 HV2040
 HV2040_MARKER: DD = SURVEY DISK
 HV2040_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2040_SP_SET: CULVERT
 HV2040_STAMPING: 1103
 HV2040_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2040
 HV2040  HISTORY     - Date     Condition        Report By
 HV2040  HISTORY     - UNK      MONUMENTED       USACE
 HV2040  HISTORY     - 1944     GOOD             CGS
 HV2040
 HV2040                          STATION DESCRIPTION
 HV2040
 HV2040'DESCRIBED BY COAST AND GEODETIC SURVEY 1944
 HV2040'IN WASHINGTON.
 HV2040'IN SOUTHEAST WASHINGTON, AT BOLLING AIR FORCE BASE, NEAR THE
 HV2040'SOUTHWEST CORNER OF THE FIELD, 37.5 FEET WEST OF THE NORTHWEST
 HV2040'CORNER OF BUILDING 79 OVER A SEWER OUTLET, IN THE TOP OF THE
 HV2040'NORTH CONCRETE RETAINING WALL OF THE OUTLET CHANNEL, 2
 HV2040'FEET NORTH OF THE SOUTH EDGE OF THE RETAINING WALL, AND 1 FOOT
 HV2040'EAST OF THE WEST END.  A CORPS OF ENGINEERS, U.S. ARMY, STANDARD
 HV2040'DISK, STAMPED 1103.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1382 ***********************************************************************
 HV1382  DESIGNATION -  112 WNY
 HV1382  PID         -  HV1382
 HV1382  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1382  COUNTRY     -  US
 HV1382  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1382
 HV1382                         *CURRENT SURVEY CONTROL
 HV1382  ______________________________________________________________________
 HV1382* NAD 83(1986) POSITION- 38 52 33.     (N) 076 59 49.     (W)   SCALED
 HV1382* NAVD 88 ORTHO HEIGHT -     5.88  (+/-2cm)       19.3   (feet) VERTCON3
 HV1382  ______________________________________________________________________
 HV1382  GEOID HEIGHT    -        -32.176 (meters)                     GEOID18
 HV1382  VERT ORDER      -  ? (See Below)
 HV1382
 HV1382.The horizontal coordinates were scaled from a map and have
 HV1382.an estimated accuracy of +/- 6 seconds.
 HV1382
 HV1382.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1382.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1382
 HV1382.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1382.GEOID18 height accuracy estimate available here.
 HV1382
 HV1382.The vertical order pertains to the NGVD 29 superseded value.
 HV1382
 HV1382.Click photographs - Photos may exist for this station.
 HV1382
 HV1382
 HV1382_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ267048(NAD 83)
 HV1382
 HV1382                          SUPERSEDED SURVEY CONTROL
 HV1382
 HV1382  NGVD 29 (11/26/84)    6.123  (m)           20.09   (f) ADJUSTED       
 HV1382
 HV1382.Superseded values are not recommended for survey control.
 HV1382
 HV1382.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1382.See file dsdata.pdf to determine how the superseded data were derived.
 HV1382
 HV1382_MARKER: DB = BENCH MARK DISK
 HV1382_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1382_SP_SET: RETAINING WALL
 HV1382_STAMPING: NO 112 1940
 HV1382_MARK LOGO: WASNAV
 HV1382_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1382_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1382+SATELLITE: SATELLITE OBSERVATIONS - March 15, 2012
 HV1382
 HV1382  HISTORY     - Date     Condition        Report By
 HV1382  HISTORY     - 1940     MONUMENTED       USACE
 HV1382  HISTORY     - 1942     GOOD             CGS
 HV1382  HISTORY     - 19950810 GOOD             USPSQD
 HV1382  HISTORY     - 20120315 GOOD             GEOCAC
 HV1382
 HV1382                          STATION DESCRIPTION
 HV1382
 HV1382'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1382'IN WASHINGTON.
 HV1382'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1382'AT THE SOUTHWEST CORNER OF THE INTERSECTION OF PATTERSON STREET
 HV1382'AND WARRINGTON AVENUE, IN THE TOP OF THE CONCRETE COPING OF A
 HV1382'STONE RETAINING WALL, 7 FEET NORTHWEST OF A FIRE HYDRANT, AND
 HV1382'5.7 FEET SOUTHWEST OF A FIRE-ALARM BOX.  A WASHINGTON NAVY YARD
 HV1382'STANDARD DISK, STAMPED NO 112 1940.
 HV1382
 HV1382                          STATION RECOVERY (1995)
 HV1382
 HV1382'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1382'RECOVERED IN GOOD CONDITION.
 HV1382
 HV1382                          STATION RECOVERY (2012)
 HV1382
 HV1382'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV1382'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1356 ***********************************************************************
 HV1356  DESIGNATION -  1130 WSSC
 HV1356  PID         -  HV1356
 HV1356  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1356  COUNTRY     -  US
 HV1356  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1356
 HV1356                         *CURRENT SURVEY CONTROL
 HV1356  ______________________________________________________________________
 HV1356* NAD 83(1986) POSITION- 38 55 55.     (N) 076 57 34.     (W)   SCALED
 HV1356* NAVD 88 ORTHO HEIGHT -    23.49  (+/-2cm)       77.1   (feet) VERTCON3
 HV1356  ______________________________________________________________________
 HV1356  GEOID HEIGHT    -        -32.148 (meters)                     GEOID18
 HV1356  VERT ORDER      -  SECOND    CLASS 0 (See Below)
 HV1356
 HV1356.The horizontal coordinates were scaled from a map and have
 HV1356.an estimated accuracy of +/- 6 seconds.
 HV1356
 HV1356.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1356.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1356
 HV1356.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1356.GEOID18 height accuracy estimate available here.
 HV1356
 HV1356.The vertical order pertains to the NGVD 29 superseded value.
 HV1356
 HV1356.Click photographs - Photos may exist for this station.
 HV1356
 HV1356
 HV1356_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ301110(NAD 83)
 HV1356
 HV1356                          SUPERSEDED SURVEY CONTROL
 HV1356
 HV1356  NGVD 29 (11/26/84)   23.719  (m)           77.82   (f) ADJUSTED    2 0
 HV1356
 HV1356.Superseded values are not recommended for survey control.
 HV1356
 HV1356.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1356.See file dsdata.pdf to determine how the superseded data were derived.
 HV1356
 HV1356_MARKER: Z = SEE DESCRIPTION
 HV1356_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1356_SP_SET: BOUNDARY STONE
 HV1356_STAMPING: WSSC 1130
 HV1356_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1356
 HV1356  HISTORY     - Date     Condition        Report By
 HV1356  HISTORY     - UNK      MONUMENTED       WSSC
 HV1356  HISTORY     - 1944     GOOD             WSSC
 HV1356
 HV1356                          STATION DESCRIPTION
 HV1356
 HV1356'DESCRIBED BY WASH SUBURB SAN COMM 1944
 HV1356'AT MT RAINIER.
 HV1356'ON EASTERN AVENUE, ABOUT 150 FEET NORTHWEST OF THE BALTIMORE
 HV1356'AND OHIO RAILROAD, AT HARICLIFFS SUB-DIVISION, ON THE EAST SIDE
 HV1356'OF EASTERN AVENUE AND IN THE SOUTHWEST SIDE OF A MD.-D.C.
 HV1356'BOUNDARY STONE. LAG SCREW AND WASHER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1359 ***********************************************************************
 HV1359  DESIGNATION -  1132 WSSC
 HV1359  PID         -  HV1359
 HV1359  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1359  COUNTRY     -  US
 HV1359  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1359
 HV1359                         *CURRENT SURVEY CONTROL
 HV1359  ______________________________________________________________________
 HV1359* NAD 83(1986) POSITION- 38 56 07.     (N) 076 57 49.     (W)   SCALED
 HV1359* NAVD 88 ORTHO HEIGHT -    26.31  (+/-2cm)       86.3   (feet) VERTCON3
 HV1359  ______________________________________________________________________
 HV1359  GEOID HEIGHT    -        -32.132 (meters)                     GEOID18
 HV1359  VERT ORDER      -  SECOND    CLASS 0 (See Below)
 HV1359
 HV1359.The horizontal coordinates were scaled from a map and have
 HV1359.an estimated accuracy of +/- 6 seconds.
 HV1359
 HV1359.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1359.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1359
 HV1359.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1359.GEOID18 height accuracy estimate available here.
 HV1359
 HV1359.The vertical order pertains to the NGVD 29 superseded value.
 HV1359
 HV1359.Click photographs - Photos may exist for this station.
 HV1359
 HV1359
 HV1359_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ298114(NAD 83)
 HV1359
 HV1359                          SUPERSEDED SURVEY CONTROL
 HV1359
 HV1359  NGVD 29 (11/26/84)   26.539  (m)           87.07   (f) ADJUSTED    2 0
 HV1359
 HV1359.Superseded values are not recommended for survey control.
 HV1359
 HV1359.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1359.See file dsdata.pdf to determine how the superseded data were derived.
 HV1359
 HV1359_MARKER: B = BOLT
 HV1359_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1359_SP_SET: BUILDING
 HV1359_STAMPING: 1132
 HV1359_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1359
 HV1359  HISTORY     - Date     Condition        Report By
 HV1359  HISTORY     - UNK      MONUMENTED       WSSC
 HV1359  HISTORY     - 1944     GOOD             WSSC
 HV1359
 HV1359                          STATION DESCRIPTION
 HV1359
 HV1359'DESCRIBED BY WASH SUBURB SAN COMM 1944
 HV1359'AT MT RAINIER.
 HV1359'AT THE WEST CORNER OF THE INTERSECTION OF EASTERN AVENUE AND
 HV1359'RHODE ISLAND AVENUE, AT THE BACK CORNER OF A SERVICE STATION
 HV1359'ON MUNROE STREET, AND IN THE EAST SIDE OF THE BUILDING.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1915 ***********************************************************************
 HV1915  DESIGNATION -  12
 HV1915  PID         -  HV1915
 HV1915  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1915  COUNTRY     -  US
 HV1915  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1915
 HV1915                         *CURRENT SURVEY CONTROL
 HV1915  ______________________________________________________________________
 HV1915* NAD 83(1986) POSITION- 38 56 38.     (N) 077 04 08.     (W)   SCALED
 HV1915* NAVD 88 ORTHO HEIGHT -   103.721 (meters)      340.29  (feet) ADJUSTED
 HV1915  ______________________________________________________________________
 HV1915  GEOID HEIGHT    -        -31.956 (meters)                     GEOID18
 HV1915  DYNAMIC HEIGHT  -        103.665 (meters)      340.11  (feet) COMP
 HV1915  MODELED GRAVITY -    980,082.8   (mgal)                       NAVD 88
 HV1915
 HV1915  VERT ORDER      -  SECOND    CLASS 0
 HV1915
 HV1915.The horizontal coordinates were scaled from a map and have
 HV1915.an estimated accuracy of +/- 6 seconds.
 HV1915
 HV1915.The orthometric height was determined by differential leveling and
 HV1915.adjusted by the NATIONAL GEODETIC SURVEY
 HV1915.in June 1991.
 HV1915
 HV1915.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1915.GEOID18 height accuracy estimate available here.
 HV1915
 HV1915.Click photographs - Photos may exist for this station.
 HV1915
 HV1915.The dynamic height is computed by dividing the NAVD 88
 HV1915.geopotential number by the normal gravity value computed on the
 HV1915.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1915.degrees latitude (g = 980.6199 gals.).
 HV1915
 HV1915.The modeled gravity was interpolated from observed gravity values.
 HV1915
 HV1915
 HV1915_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ207125(NAD 83)
 HV1915
 HV1915                          SUPERSEDED SURVEY CONTROL
 HV1915
 HV1915  NGVD 29 (11/26/84)  103.953  (m)          341.05   (f) ADJUSTED    2 0
 HV1915
 HV1915.Superseded values are not recommended for survey control.
 HV1915
 HV1915.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1915.See file dsdata.pdf to determine how the superseded data were derived.
 HV1915
 HV1915_MARKER: X = CHISELED CROSS
 HV1915_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1915_SP_SET: CONCRETE PLATFORM
 HV1915_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1915
 HV1915  HISTORY     - Date     Condition        Report By
 HV1915  HISTORY     - UNK      MONUMENTED       CGS
 HV1915  HISTORY     - 1970     GOOD             NGS
 HV1915
 HV1915                          STATION DESCRIPTION
 HV1915
 HV1915'DESCRIBED BY NATIONAL GEODETIC SURVEY 1970
 HV1915'IN WASHINGTON.
 HV1915'AT NW. WASHINGTON ON THE GROUNDS OF THE OLD BUREAU OF STANDARDS,
 HV1915'NOW OCCUPIED BY THE WASHINGTON INSTITUTE OF TECH. SET IN THE TOP
 HV1915'OF THE N. END OF THE CONC PLATFORM FOR THE CONC STEPS TO THE
 HV1915'E. ENTRANCE TO BUILDING 2 FT 6 IN E. OF THE WALL OF THE BUILDING.
 HV1915'6 IN S. OF THE S. EDGE OF CONC. RETAINING WALL OF THE N END OF
 HV1915'STEPS AND PLATFORM 7 FT. N OF THE CENTERLINE OF THE DOORWAY
 HV1915'ENTRANCE.  A 1 1/2 X 1 1/2 IN CHISELED CROSS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1408 ***********************************************************************
 HV1408  DESIGNATION -  12=C=TIDAL BM
 HV1408  PID         -  HV1408
 HV1408  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1408  COUNTRY     -  US
 HV1408  USGS QUAD   -  ANACOSTIA (2016)
 HV1408
 HV1408                         *CURRENT SURVEY CONTROL
 HV1408  ______________________________________________________________________
 HV1408* NAD 83(1986) POSITION- 38 52 23.     (N) 076 59 43.     (W)   SCALED
 HV1408* NAVD 88 ORTHO HEIGHT -     2.573 (meters)        8.44  (feet) POSTED
 HV1408  ______________________________________________________________________
 HV1408  GEOID HEIGHT    -        -32.183 (meters)                     GEOID18
 HV1408  DYNAMIC HEIGHT  -          2.57  (meters)        8.4   (feet) COMP
 HV1408  MODELED GRAVITY -    980,096.0   (mgal)                       NAVD 88
 HV1408
 HV1408  VERT ORDER      -  * POSTED, SEE BELOW
 HV1408
 HV1408.The horizontal coordinates were scaled from a map and have
 HV1408.an estimated accuracy of +/- 6 seconds.
 HV1408
 HV1408.The orthometric height was determined by differential leveling
 HV1408.and adjusted by the NATIONAL GEODETIC SURVEY in 1992.
 HV1408
 HV1408.* This is a POSTED BENCH MARK height.
 HV1408
 HV1408.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1408.GEOID18 height accuracy estimate available here.
 HV1408
 HV1408.Click photographs - Photos may exist for this station.
 HV1408
 HV1408.The dynamic height is computed by dividing the NAVD 88
 HV1408.geopotential number by the normal gravity value computed on the
 HV1408.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1408.degrees latitude (g = 980.6199 gals.).
 HV1408
 HV1408.The modeled gravity was interpolated from observed gravity values.
 HV1408
 HV1408
 HV1408_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ269045(NAD 83)
 HV1408
 HV1408                          SUPERSEDED SURVEY CONTROL
 HV1408
 HV1408  NGVD 29 (11/26/84)    2.813  (m)            9.23   (f) ADJUSTED    1 2
 HV1408
 HV1408.Superseded values are not recommended for survey control.
 HV1408
 HV1408.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1408.See file dsdata.pdf to determine how the superseded data were derived.
 HV1408
 HV1408_MARKER: Z = SEE DESCRIPTION
 HV1408_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1408_SP_SET: COLUMN UNDER PORCH
 HV1408_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1408
 HV1408  HISTORY     - Date     Condition        Report By
 HV1408  HISTORY     - 1894     MONUMENTED       USACE
 HV1408  HISTORY     - 1923     GOOD             CGS
 HV1408
 HV1408                          STATION DESCRIPTION
 HV1408
 HV1408'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1408'IN WASHINGTON.
 HV1408'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN
 HV1408'FACTORY, AT BUILDING 1 (FORMERLY THE COMMANDANTS OFFICE), AT
 HV1408'THE BRICK COLUMN UNDER THE SOUTHWEST CORNER OF THE PORCH, ON
 HV1408'THE SOUTH SIDE OF THE COLUMN, AT THE WEST EDGE OF THE UPPER
 HV1408'SURFACE OF AN IRON PLATE, AND ABOUT 1 FOOT ABOVE THE PAVEMENT.
 HV1408'THE OUTER 1/2-INCH OF THE LEDGE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4516 ***********************************************************************
 HV4516  DESIGNATION -  13 E
 HV4516  PID         -  HV4516
 HV4516  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4516  COUNTRY     -  US
 HV4516  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4516
 HV4516                         *CURRENT SURVEY CONTROL
 HV4516  ______________________________________________________________________
 HV4516* NAD 83(1993) POSITION- 38 53 45.72871(N) 077 01 46.10152(W)   ADJUSTED
 HV4516* NAVD 88 ORTHO HEIGHT -     4.44  (+/-2cm)       14.6   (feet) VERTCON3
 HV4516  ______________________________________________________________________
 HV4516  GEOID HEIGHT    -        -32.082 (meters)                     GEOID18
 HV4516  LAPLACE CORR    -         -2.59  (seconds)                    DEFLEC18
 HV4516  HORZ ORDER      -  SECOND
 HV4516  VERT ORDER      -  THIRD ? (See Below)
 HV4516
 HV4516.The horizontal coordinates were established by classical geodetic methods
 HV4516.and adjusted by the National Geodetic Survey in November 1994.
 HV4516
 HV4516.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4516.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4516
 HV4516.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4516.GEOID18 height accuracy estimate available here.
 HV4516
 HV4516.The vertical order pertains to the NGVD 29 superseded value.
 HV4516
 HV4516.Click photographs - Photos may exist for this station.
 HV4516
 HV4516.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4516
 HV4516. The following values were computed from the NAD 83(1993) position.
 HV4516
 HV4516;                    North         East     Units Scale Factor Converg.
 HV4516;SPC MD       -   136,465.651   397,443.287   MT  0.99994991   -0 01 06.6
 HV4516;SPC MD       -   447,721.06  1,303,945.18   sFT  0.99994991   -0 01 06.6
 HV4516;SPC VA N     - 2,137,481.777 3,627,562.168   MT  0.99996017   +0 55 04.0
 HV4516;SPC VA N     - 7,012,721.46 11,901,426.88   sFT  0.99996017   +0 55 04.0
 HV4516;UTM  18      - 4,307,197.344   323,999.655   MT  0.99998144   -1 16 28.7
 HV4516
 HV4516!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4516!SPC MD       -   1.00000434  x   0.99994991  =   0.99995425
 HV4516!SPC VA N     -   1.00000434  x   0.99996017  =   0.99996451
 HV4516!UTM  18      -   1.00000434  x   0.99998144  =   0.99998578
 HV4516
 HV4516:                Primary Azimuth Mark                     Grid Az
 HV4516:SPC MD       -  13 E AZ MK                               349 35 25.0
 HV4516:SPC VA N     -  13 E AZ MK                               348 39 14.4
 HV4516:UTM  18      -  13 E AZ MK                               350 50 47.1
 HV4516
 HV4516_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2399907197(NAD 83)
 HV4516
 HV4516|---------------------------------------------------------------------|
 HV4516| PID    Reference Object                     Distance      Geod. Az  |
 HV4516|                                                           dddmmss.s |
 HV4516| HV4515 13 F                                157.966 METERS 00003     |
 HV4516| HV4514 11 E                                195.496 METERS 08950     |
 HV4516| HV4517 WP                                  130.769 METERS 25709     |
 HV4516| DC6612 13 E AZ MK                                         3493418.4 |
 HV4516|---------------------------------------------------------------------|
 HV4516
 HV4516                          SUPERSEDED SURVEY CONTROL
 HV4516
 HV4516  NAD 83(1991)-  38 53 45.72756(N)    077 01 46.10277(W) AD(       ) 2
 HV4516  NAD 83(1986)-  38 53 45.72711(N)    077 01 46.11339(W) AD(       ) 2
 HV4516  NAD 27      -  38 53 45.32762(N)    077 01 47.19315(W) AD(       ) 2
 HV4516  NGVD 29 (07/19/86)    4.68   (m)           15.4    (f) LEVELING    3  
 HV4516
 HV4516.Superseded values are not recommended for survey control.
 HV4516
 HV4516.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4516.See file dsdata.pdf to determine how the superseded data were derived.
 HV4516
 HV4516_MARKER: DD = SURVEY DISK
 HV4516_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV4516_SP_SET: SIDEWALK
 HV4516_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4516
 HV4516  HISTORY     - Date     Condition        Report By
 HV4516  HISTORY     - 1981     MONUMENTED       CANDA
 HV4516  HISTORY     - 20100314 GOOD             GEOCAC
 HV4516  HISTORY     - 20180716 GOOD             USPSQD
 HV4516
 HV4516                          STATION DESCRIPTION
 HV4516
 HV4516'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4516'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4516'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4516'
 HV4516'STATION IS LOCATED IN THE BRICK SIDEWALK ON THE SOUTHEAST CORNER OF
 HV4516'13TH STREET N.W. AND E STREET N.W.
 HV4516'
 HV4516'STATION IS 29.61 FT NE OF LIGHT POST BASE ON 13TH STREET.
 HV4516'
 HV4516'STATION IS 15.92 FT NW OF CORNER OF BUILDING.
 HV4516'
 HV4516'STATION IS 45.07 FT W OF X ON RIM SEWER M.H. ON E STREET.
 HV4516
 HV4516                          STATION RECOVERY (2010)
 HV4516
 HV4516'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 HV4516'RECOVERED IN GOOD CONDITION.
 HV4516
 HV4516                          STATION RECOVERY (2018)
 HV4516
 HV4516'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV4516'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4515 ***********************************************************************
 HV4515  DESIGNATION -  13 F
 HV4515  PID         -  HV4515
 HV4515  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4515  COUNTRY     -  US
 HV4515  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4515
 HV4515                         *CURRENT SURVEY CONTROL
 HV4515  ______________________________________________________________________
 HV4515* NAD 83(1993) POSITION- 38 53 50.85131(N) 077 01 46.09646(W)   ADJUSTED
 HV4515* NAVD 88 ORTHO HEIGHT -    11.75  (+/-2cm)       38.5   (feet) VERTCON3
 HV4515  ______________________________________________________________________
 HV4515  GEOID HEIGHT    -        -32.079 (meters)                     GEOID18
 HV4515  LAPLACE CORR    -         -2.57  (seconds)                    DEFLEC18
 HV4515  HORZ ORDER      -  SECOND
 HV4515  VERT ORDER      -  THIRD ? (See Below)
 HV4515
 HV4515.The horizontal coordinates were established by classical geodetic methods
 HV4515.and adjusted by the National Geodetic Survey in November 1994.
 HV4515
 HV4515.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4515.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4515
 HV4515.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4515.GEOID18 height accuracy estimate available here.
 HV4515
 HV4515.The vertical order pertains to the NGVD 29 superseded value.
 HV4515
 HV4515.Click photographs - Photos may exist for this station.
 HV4515
 HV4515.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4515
 HV4515. The following values were computed from the NAD 83(1993) position.
 HV4515
 HV4515;                    North         East     Units Scale Factor Converg.
 HV4515;SPC MD       -   136,623.609   397,443.460   MT  0.99994992   -0 01 06.6
 HV4515;SPC MD       -   448,239.29  1,303,945.75   sFT  0.99994992   -0 01 06.6
 HV4515;SPC VA N     - 2,137,639.718 3,627,559.760   MT  0.99996029   +0 55 04.0
 HV4515;SPC VA N     - 7,013,239.64 11,901,418.98   sFT  0.99996029   +0 55 04.0
 HV4515;UTM  18      - 4,307,355.265   324,003.291   MT  0.99998143   -1 16 28.9
 HV4515
 HV4515!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4515!SPC MD       -   1.00000319  x   0.99994992  =   0.99995311
 HV4515!SPC VA N     -   1.00000319  x   0.99996029  =   0.99996348
 HV4515!UTM  18      -   1.00000319  x   0.99998143  =   0.99998462
 HV4515
 HV4515:                Primary Azimuth Mark                     Grid Az
 HV4515:SPC MD       -  13 F AZ MK                               192 44 15.7
 HV4515:SPC VA N     -  13 F AZ MK                               191 48 05.1
 HV4515:UTM  18      -  13 F AZ MK                               193 59 38.0
 HV4515
 HV4515_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2400307355(NAD 83)
 HV4515
 HV4515|---------------------------------------------------------------------|
 HV4515| PID    Reference Object                     Distance      Geod. Az  |
 HV4515|                                                           dddmmss.s |
 HV4515| HV4516 13 E                                157.966 METERS 18003     |
 HV4515| DC6613 13 F AZ MK                                         1924309.1 |
 HV4515| HV4520 15 F                                379.608 METERS 26815     |
 HV4515|---------------------------------------------------------------------|
 HV4515
 HV4515                          SUPERSEDED SURVEY CONTROL
 HV4515
 HV4515  NAD 83(1991)-  38 53 50.85016(N)    077 01 46.09771(W) AD(       ) 2
 HV4515  NAD 83(1986)-  38 53 50.84970(N)    077 01 46.10830(W) AD(       ) 2
 HV4515  NAD 27      -  38 53 50.45033(N)    077 01 47.18794(W) AD(       ) 2
 HV4515  NGVD 29 (07/19/86)   11.99   (m)           39.3    (f) LEVELING    3  
 HV4515
 HV4515.Superseded values are not recommended for survey control.
 HV4515
 HV4515.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4515.See file dsdata.pdf to determine how the superseded data were derived.
 HV4515
 HV4515_MARKER: DD = SURVEY DISK
 HV4515_SETTING: 0 = UNSPECIFIED SETTING
 HV4515
 HV4515  HISTORY     - Date     Condition        Report By
 HV4515  HISTORY     - 1981     MONUMENTED       CANDA
 HV4515
 HV4515                          STATION DESCRIPTION
 HV4515
 HV4515'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4515'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4515'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4515'
 HV4515'STATION IS LOCATED IN THE SIDEWALK ON THE NORTHEAST CORNER OF 13TH
 HV4515'STREET N.W. AND F STREET N.W.
 HV4515'
 HV4515'STATION IS 8.48 FT NW OF SIGNAL POST BASE ON F STREET.
 HV4515'
 HV4515'STATION IS 7.11 FT SE OF SIGNAL POST BASE ON 13TH STREET.
 HV4515'
 HV4515'STATION IS 11.94 FT ENE OF X ON RIM OF M.H. IN STREET.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2013 ***********************************************************************
 HV2013  DESIGNATION -  130
 HV2013  PID         -  HV2013
 HV2013  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2013  COUNTRY     -  US
 HV2013  USGS QUAD   -  ALEXANDRIA (2019)
 HV2013
 HV2013                         *CURRENT SURVEY CONTROL
 HV2013  ______________________________________________________________________
 HV2013* NAD 83(1986) POSITION- 38 51 59.     (N) 077 01 20.     (W)   SCALED
 HV2013* NAVD 88 ORTHO HEIGHT -     1.91  (+/-2cm)        6.3   (feet) VERTCON3
 HV2013  ______________________________________________________________________
 HV2013  GEOID HEIGHT    -        -32.151 (meters)                     GEOID18
 HV2013  VERT ORDER      -  ? (See Below)
 HV2013
 HV2013.The horizontal coordinates were scaled from a map and have
 HV2013.an estimated accuracy of +/- 6 seconds.
 HV2013
 HV2013.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV2013.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV2013
 HV2013.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2013.GEOID18 height accuracy estimate available here.
 HV2013
 HV2013.The vertical order pertains to the NGVD 29 superseded value.
 HV2013
 HV2013.Click photographs - Photos may exist for this station.
 HV2013
 HV2013
 HV2013_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ245038(NAD 83)
 HV2013
 HV2013                          SUPERSEDED SURVEY CONTROL
 HV2013
 HV2013  NGVD 29 (11/26/84)    2.157  (m)            7.08   (f) ADJUSTED       
 HV2013
 HV2013.Superseded values are not recommended for survey control.
 HV2013
 HV2013.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2013.See file dsdata.pdf to determine how the superseded data were derived.
 HV2013
 HV2013_MARKER: DD = SURVEY DISK
 HV2013_SETTING: 0 = UNSPECIFIED SETTING
 HV2013_MARK LOGO: USACE
 HV2013_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2013
 HV2013  HISTORY     - Date     Condition        Report By
 HV2013  HISTORY     - UNK      MONUMENTED       USACE
 HV2013  HISTORY     - 1926     GOOD             PBPP
 HV2013  HISTORY     - 1959     GOOD             CGS
 HV2013
 HV2013                          STATION DESCRIPTION
 HV2013
 HV2013'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV2013'AT WASHINGTON.
 HV2013'AT WASHINGTON, IN EAST POTOMAC PARK, AT THE WASHINGTON CHANNEL
 HV2013'SIDE OF THE PARK, 50 FEET SOUTH OF THE SEAWALL, 20 FEET EAST OF
 HV2013'LAMPPOST 128, AND 2 FEET NORTH OF THE NORTH DRIVEWAY.  A CORPS OF
 HV2013'ENGINEERS, U.S. ARMY, STANDARD DISK.  NOTE-- LEVELING BY THE
 HV2013'NATIONAL CAPITAL PARKS SURVEY OFFICE HAS SHOWN THAT SOME OF THEM
 HV2013'HAVE SETTLED.  USE WITH CAUTION.
 HV2013
 HV2013                          STATION RECOVERY (1959)
 HV2013
 HV2013'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959
 HV2013'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2036 ***********************************************************************
 HV2036  DESIGNATION -  1308 USE
 HV2036  PID         -  HV2036
 HV2036  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2036  COUNTRY     -  US
 HV2036  USGS QUAD   -  ALEXANDRIA (2019)
 HV2036
 HV2036                         *CURRENT SURVEY CONTROL
 HV2036  ______________________________________________________________________
 HV2036* NAD 83(1986) POSITION- 38 51 01.     (N) 077 01 06.     (W)   SCALED
 HV2036* NAVD 88 ORTHO HEIGHT -     4.494 (meters)       14.74  (feet) ADJUSTED
 HV2036  ______________________________________________________________________
 HV2036  GEOID HEIGHT    -        -32.183 (meters)                     GEOID18
 HV2036  DYNAMIC HEIGHT  -          4.492 (meters)       14.74  (feet) COMP
 HV2036  MODELED GRAVITY -    980,093.4   (mgal)                       NAVD 88
 HV2036
 HV2036  VERT ORDER      -  FIRST     CLASS II
 HV2036
 HV2036.The horizontal coordinates were scaled from a map and have
 HV2036.an estimated accuracy of +/- 6 seconds.
 HV2036
 HV2036.The orthometric height was determined by differential leveling and
 HV2036.adjusted by the NATIONAL GEODETIC SURVEY
 HV2036.in June 1991.
 HV2036
 HV2036.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2036.GEOID18 height accuracy estimate available here.
 HV2036
 HV2036.Click photographs - Photos may exist for this station.
 HV2036
 HV2036.The dynamic height is computed by dividing the NAVD 88
 HV2036.geopotential number by the normal gravity value computed on the
 HV2036.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2036.degrees latitude (g = 980.6199 gals.).
 HV2036
 HV2036.The modeled gravity was interpolated from observed gravity values.
 HV2036
 HV2036
 HV2036_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ248020(NAD 83)
 HV2036
 HV2036                          SUPERSEDED SURVEY CONTROL
 HV2036
 HV2036  NGVD 29 (11/26/84)    4.755  (m)           15.60   (f) ADJUSTED    1 2
 HV2036
 HV2036.Superseded values are not recommended for survey control.
 HV2036
 HV2036.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2036.See file dsdata.pdf to determine how the superseded data were derived.
 HV2036
 HV2036_MARKER: DD = SURVEY DISK
 HV2036_SETTING: 17 = SET INTO TOP OF METAL PIPE DRIVEN INTO GROUND
 HV2036_STAMPING: 1308
 HV2036_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2036
 HV2036  HISTORY     - Date     Condition        Report By
 HV2036  HISTORY     - UNK      MONUMENTED       USACE
 HV2036  HISTORY     - 1944     GOOD             CGS
 HV2036
 HV2036                          STATION DESCRIPTION
 HV2036
 HV2036'DESCRIBED BY COAST AND GEODETIC SURVEY 1944
 HV2036'IN WASHINGTON.
 HV2036'IN SOUTHEAST WASHINGTON, AT THE BOUNDARY BETWEEN NAVAL AIR
 HV2036'STAITON AND BOLLING AIR FORCE BASE, ON THE TOP OF THE ANACOSTIA
 HV2036'RIVER LEVEE, AND 30 FEET FROM THE RIVER.  A CORPS OF ENGINEERS,
 HV2036'U.S. ARMY, STANDARD DISK, STAMPED 1308 AND SET IN THE TOP
 HV2036'OF A 3-1/2-INCH CONCRETE-FILLED PIPE PROJECTING 1 INCH ABOVE
 HV2036'GROUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1307 ***********************************************************************
 HV1307  DESIGNATION -  1308 WSSC
 HV1307  PID         -  HV1307
 HV1307  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1307  COUNTRY     -  US
 HV1307  USGS QUAD   -  ANACOSTIA (2016)
 HV1307
 HV1307                         *CURRENT SURVEY CONTROL
 HV1307  ______________________________________________________________________
 HV1307* NAD 83(1986) POSITION- 38 51 37.     (N) 076 58 06.     (W)   SCALED
 HV1307* NAVD 88 ORTHO HEIGHT -    85.00  (+/-2cm)      278.9   (feet) VERTCON3
 HV1307  ______________________________________________________________________
 HV1307  GEOID HEIGHT    -        -32.245 (meters)                     GEOID18
 HV1307  VERT ORDER      -  SECOND    CLASS 0 (See Below)
 HV1307
 HV1307.The horizontal coordinates were scaled from a map and have
 HV1307.an estimated accuracy of +/- 6 seconds.
 HV1307
 HV1307.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1307.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1307
 HV1307.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1307.GEOID18 height accuracy estimate available here.
 HV1307
 HV1307.The vertical order pertains to the NGVD 29 superseded value.
 HV1307
 HV1307.Click photographs - Photos may exist for this station.
 HV1307
 HV1307
 HV1307_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ292031(NAD 83)
 HV1307
 HV1307                          SUPERSEDED SURVEY CONTROL
 HV1307
 HV1307  NGVD 29 (11/26/84)   85.243  (m)          279.67   (f) ADJUSTED    2 0
 HV1307
 HV1307.Superseded values are not recommended for survey control.
 HV1307
 HV1307.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1307.See file dsdata.pdf to determine how the superseded data were derived.
 HV1307
 HV1307_MARKER: B = BOLT
 HV1307_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1307_SP_SET: BRICK PIER
 HV1307_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1307
 HV1307  HISTORY     - Date     Condition        Report By
 HV1307  HISTORY     - 1944     MONUMENTED       WSSC
 HV1307
 HV1307                          STATION DESCRIPTION
 HV1307
 HV1307'DESCRIBED BY WASH SUBURB SAN COMM 1944
 HV1307'AT NAYLOR HEIGHTS.
 HV1307'ON ALABAMA AVENUE, JUST NORTH OF NAYLOR GARDENS, AT THE INTERSECTION
 HV1307'OF GOOD HOPE ROAD AND WALKER ROAD, AT THE LORD BALTIMORE GAS
 HV1307'STATION ON THE SOUTH SIDE OF THE ALABAMA AVENUE, AT THE MIDDLE
 HV1307'PIER, AND IN THE NORTH SIDE OF THE BRICK PIER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2038 ***********************************************************************
 HV2038  DESIGNATION -  1334 USE
 HV2038  PID         -  HV2038
 HV2038  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2038  COUNTRY     -  US
 HV2038  USGS QUAD   -  ALEXANDRIA (2019)
 HV2038
 HV2038                         *CURRENT SURVEY CONTROL
 HV2038  ______________________________________________________________________
 HV2038* NAD 83(1986) POSITION- 38 50 39.     (N) 077 01 18.     (W)   SCALED
 HV2038* NAVD 88 ORTHO HEIGHT -     4.948 (meters)       16.23  (feet) ADJUSTED
 HV2038  ______________________________________________________________________
 HV2038  GEOID HEIGHT    -        -32.187 (meters)                     GEOID18
 HV2038  DYNAMIC HEIGHT  -          4.945 (meters)       16.22  (feet) COMP
 HV2038  MODELED GRAVITY -    980,092.9   (mgal)                       NAVD 88
 HV2038
 HV2038  VERT ORDER      -  FIRST     CLASS II
 HV2038
 HV2038.The horizontal coordinates were scaled from a map and have
 HV2038.an estimated accuracy of +/- 6 seconds.
 HV2038
 HV2038.The orthometric height was determined by differential leveling and
 HV2038.adjusted by the NATIONAL GEODETIC SURVEY
 HV2038.in June 1991.
 HV2038
 HV2038.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2038.GEOID18 height accuracy estimate available here.
 HV2038
 HV2038.Click photographs - Photos may exist for this station.
 HV2038
 HV2038.The dynamic height is computed by dividing the NAVD 88
 HV2038.geopotential number by the normal gravity value computed on the
 HV2038.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2038.degrees latitude (g = 980.6199 gals.).
 HV2038
 HV2038.The modeled gravity was interpolated from observed gravity values.
 HV2038
 HV2038
 HV2038_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ245014(NAD 83)
 HV2038
 HV2038                          SUPERSEDED SURVEY CONTROL
 HV2038
 HV2038  NGVD 29 (11/26/84)    5.208  (m)           17.09   (f) ADJUSTED    1 2
 HV2038
 HV2038.Superseded values are not recommended for survey control.
 HV2038
 HV2038.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2038.See file dsdata.pdf to determine how the superseded data were derived.
 HV2038
 HV2038_MARKER: DD = SURVEY DISK
 HV2038_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2038_SP_SET: SIDEWALK
 HV2038_STAMPING: 1334
 HV2038_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2038
 HV2038  HISTORY     - Date     Condition        Report By
 HV2038  HISTORY     - UNK      MONUMENTED       USACE
 HV2038  HISTORY     - 1944     GOOD             CGS
 HV2038
 HV2038                          STATION DESCRIPTION
 HV2038
 HV2038'DESCRIBED BY COAST AND GEODETIC SURVEY 1944
 HV2038'IN WASHINGTON.
 HV2038'IN SOUTHEAST WASHINGTON, AT BOLLING AIR FORCE BASE, 0.65 MILE
 HV2038'NORTH ALONG DARGUE AVENUE FROM THE INTERSECTION OF HICKMAN
 HV2038'AVENUE, 52 FEET EAST OF THE CENTERLINE OF DARGUE AVENUE, AT
 HV2038'THE NORTHERNMOST CONCRETE STANDING, 10 FEET EAST OF THE WEST
 HV2038'EDGE OF THE CIRCLE, AND IN THE TOP OF THE PAVEMENT.  A CORPS
 HV2038'OF ENGINEERS, U.S. ARMY, STANDARD DISK, STAMPED 1334.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2039 ***********************************************************************
 HV2039  DESIGNATION -  1335 USE
 HV2039  PID         -  HV2039
 HV2039  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2039  COUNTRY     -  US
 HV2039  USGS QUAD   -  ALEXANDRIA (2019)
 HV2039
 HV2039                         *CURRENT SURVEY CONTROL
 HV2039  ______________________________________________________________________
 HV2039* NAD 83(1986) POSITION- 38 50 17.     (N) 077 01 24.     (W)   SCALED
 HV2039* NAVD 88 ORTHO HEIGHT -     2.518 (meters)        8.26  (feet) ADJUSTED
 HV2039  ______________________________________________________________________
 HV2039  GEOID HEIGHT    -        -32.194 (meters)                     GEOID18
 HV2039  DYNAMIC HEIGHT  -          2.517 (meters)        8.26  (feet) COMP
 HV2039  MODELED GRAVITY -    980,092.3   (mgal)                       NAVD 88
 HV2039
 HV2039  VERT ORDER      -  FIRST     CLASS II
 HV2039
 HV2039.The horizontal coordinates were scaled from a map and have
 HV2039.an estimated accuracy of +/- 6 seconds.
 HV2039
 HV2039.The orthometric height was determined by differential leveling and
 HV2039.adjusted by the NATIONAL GEODETIC SURVEY
 HV2039.in June 1991.
 HV2039
 HV2039.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2039.GEOID18 height accuracy estimate available here.
 HV2039
 HV2039.Click photographs - Photos may exist for this station.
 HV2039
 HV2039.The dynamic height is computed by dividing the NAVD 88
 HV2039.geopotential number by the normal gravity value computed on the
 HV2039.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2039.degrees latitude (g = 980.6199 gals.).
 HV2039
 HV2039.The modeled gravity was interpolated from observed gravity values.
 HV2039
 HV2039
 HV2039_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ243007(NAD 83)
 HV2039
 HV2039                          SUPERSEDED SURVEY CONTROL
 HV2039
 HV2039  NGVD 29 (11/26/84)    2.780  (m)            9.12   (f) ADJUSTED    1 2
 HV2039
 HV2039.Superseded values are not recommended for survey control.
 HV2039
 HV2039.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2039.See file dsdata.pdf to determine how the superseded data were derived.
 HV2039
 HV2039_MARKER: DD = SURVEY DISK
 HV2039_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2039_SP_SET: RUNWAY
 HV2039_STAMPING: 1335
 HV2039_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2039
 HV2039  HISTORY     - Date     Condition        Report By
 HV2039  HISTORY     - UNK      MONUMENTED       USACE
 HV2039  HISTORY     - 1944     GOOD             CGS
 HV2039
 HV2039                          STATION DESCRIPTION
 HV2039
 HV2039'DESCRIBED BY COAST AND GEODETIC SURVEY 1944
 HV2039'IN WASHINGTON.
 HV2039'IN SOUTHEAST WASHINGTON, AT BOLLING AIR FORCE BASE, 0.2 MILE
 HV2039'NORTH ALONG DARGUE AVENUE FROM THE INTERSECTION OF HICKMAN
 HV2039'AVENUE, IN THE TOP OF A SHORT CONCRETE RUNWAY, 100 FEET EAST
 HV2039'OF THE END OF THE RUNWAY, 30 FEET NORTH OF THE SOUTH EDGE, AND
 HV2039'18 FEET SOUTH OF THE NORTH EDGE.  A CORPS OF ENGINEERS, U.S.
 HV2039'ARMY, STANDARD DISK, STAMPED 1335.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ5418 ***********************************************************************
 AJ5418  DESIGNATION -  142+50 OBT
 AJ5418  PID         -  AJ5418
 AJ5418  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ5418  COUNTRY     -  US
 AJ5418  USGS QUAD   -  ANACOSTIA (2016)
 AJ5418
 AJ5418                         *CURRENT SURVEY CONTROL
 AJ5418  ______________________________________________________________________
 AJ5418* NAD 83(1986) POSITION- 38 52 19.     (N) 076 59 51.     (W)   SCALED
 AJ5418* NAVD 88 ORTHO HEIGHT -   -25.058 (meters)      -82.21  (feet) ADJUSTED
 AJ5418  ______________________________________________________________________
 AJ5418  GEOID HEIGHT    -        -32.182 (meters)                     GEOID18
 AJ5418  DYNAMIC HEIGHT  -        -25.044 (meters)      -82.17  (feet) COMP
 AJ5418  MODELED GRAVITY -    980,096.0   (mgal)                       NAVD 88
 AJ5418
 AJ5418  VERT ORDER      -  SECOND    CLASS I
 AJ5418
 AJ5418.The horizontal coordinates were scaled from a map and have
 AJ5418.an estimated accuracy of +/- 6 seconds.
 AJ5418
 AJ5418.The orthometric height was determined by differential leveling and
 AJ5418.adjusted by the NATIONAL GEODETIC SURVEY
 AJ5418.in October 2001.
 AJ5418
 AJ5418.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ5418.GEOID18 height accuracy estimate available here.
 AJ5418
 AJ5418.Click photographs - Photos may exist for this station.
 AJ5418
 AJ5418.The dynamic height is computed by dividing the NAVD 88
 AJ5418.geopotential number by the normal gravity value computed on the
 AJ5418.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ5418.degrees latitude (g = 980.6199 gals.).
 AJ5418
 AJ5418.The modeled gravity was interpolated from observed gravity values.
 AJ5418
 AJ5418
 AJ5418_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ267044(NAD 83)
 AJ5418
 AJ5418                          SUPERSEDED SURVEY CONTROL
 AJ5418
 AJ5418.No superseded survey control is available for this station.
 AJ5418
 AJ5418_MARKER: DD = SURVEY DISK
 AJ5418_SETTING: 35 = SET IN A MAT FOUNDATION OR CONCRETE SLAB OTHER THAN
 AJ5418+WITH SETTING: PAVEMENT
 AJ5418_SP_SET: SAFETY WALKWAY
 AJ5418_STAMPING: 142+50 OBT
 AJ5418_MARK LOGO: NONE
 AJ5418_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ5418_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AJ5418+STABILITY: SURFACE MOTION
 AJ5418
 AJ5418  HISTORY     - Date     Condition        Report By
 AJ5418  HISTORY     - 1989     MONUMENTED       WMATA
 AJ5418  HISTORY     - 20010806 GOOD             NGS
 AJ5418
 AJ5418                          STATION DESCRIPTION
 AJ5418
 AJ5418'DESCRIBED BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 AJ5418'0.2 MILE (0.3 KM) EAST ALONG M STREET FROM THE NORTHBOUND LANES OF
 AJ5418'SOUTH CAPITOL BLVD TO THE NAVY METRO STATION ON LEFT, THENCE DOWN
 AJ5418'ESCALATORS TO THE MAIN TRACKS, THENCE 0.3 MILE (0.5 KM) SOUTHEAST
 AJ5418'ALONG OUTBOUND TRACKS TO MARK ON LEFT IN THE TUNNEL, APPROXIMATELY 2.5
 AJ5418'FEET (0.8 M) ABOVE TRACKS, 0.3 MILE (0.5 KM) FROM BM F040B 12666.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1309 ***********************************************************************
 HV1309  DESIGNATION -  1433 WSSC
 HV1309  PID         -  HV1309
 HV1309  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1309  COUNTRY     -  US
 HV1309  USGS QUAD   -  ANACOSTIA (2016)
 HV1309
 HV1309                         *CURRENT SURVEY CONTROL
 HV1309  ______________________________________________________________________
 HV1309* NAD 83(1986) POSITION- 38 52 15.     (N) 076 56 32.     (W)   SCALED
 HV1309* NAVD 88 ORTHO HEIGHT -    91.42  (+/-2cm)      299.9   (feet) VERTCON3
 HV1309  ______________________________________________________________________
 HV1309  GEOID HEIGHT    -        -32.281 (meters)                     GEOID18
 HV1309  VERT ORDER      -  SECOND    CLASS 0 (See Below)
 HV1309
 HV1309.The horizontal coordinates were scaled from a map and have
 HV1309.an estimated accuracy of +/- 6 seconds.
 HV1309
 HV1309.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1309.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1309
 HV1309.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1309.GEOID18 height accuracy estimate available here.
 HV1309
 HV1309.The vertical order pertains to the NGVD 29 superseded value.
 HV1309
 HV1309.Click photographs - Photos may exist for this station.
 HV1309
 HV1309
 HV1309_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ315042(NAD 83)
 HV1309
 HV1309                          SUPERSEDED SURVEY CONTROL
 HV1309
 HV1309  NGVD 29 (11/26/84)   91.658  (m)          300.71   (f) ADJUSTED    2 0
 HV1309
 HV1309.Superseded values are not recommended for survey control.
 HV1309
 HV1309.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1309.See file dsdata.pdf to determine how the superseded data were derived.
 HV1309
 HV1309_MARKER: B = BOLT
 HV1309_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1309_SP_SET: STEP
 HV1309_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1309
 HV1309  HISTORY     - Date     Condition        Report By
 HV1309  HISTORY     - 1944     MONUMENTED       WSSC
 HV1309
 HV1309                          STATION DESCRIPTION
 HV1309
 HV1309'DESCRIBED BY WASH SUBURB SAN COMM 1944
 HV1309'IN WASHINGTON.
 HV1309'IN THE SOUTHWEST CORNER OF THE INTERSECTION OF ALABAMA AVENUE AND
 HV1309'BOULEVARD AVENUE, AT A BRICK BUNGALOW, AND IN THE EAST END OF
 HV1309'THE BOTTOM CONCRETE STEP.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1308 ***********************************************************************
 HV1308  DESIGNATION -  1434 WSSC
 HV1308  PID         -  HV1308
 HV1308  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1308  COUNTRY     -  US
 HV1308  USGS QUAD   -  ANACOSTIA (2016)
 HV1308
 HV1308                         *CURRENT SURVEY CONTROL
 HV1308  ______________________________________________________________________
 HV1308* NAD 83(1986) POSITION- 38 51 44.40   (N) 076 57 29.99   (W)   HD_HELD1
 HV1308* NAVD 88 ORTHO HEIGHT -    88.08  (+/-2cm)      289.0   (feet) VERTCON3
 HV1308  ______________________________________________________________________
 HV1308  GEOID HEIGHT    -        -32.260 (meters)                     GEOID18
 HV1308  VERT ORDER      -  SECOND    CLASS 0 (See Below)
 HV1308
 HV1308.The horizontal coordinates were determined by differentially corrected
 HV1308.hand held GPS observations or other comparable positioning techniques
 HV1308.and have an estimated accuracy of +/- 3 meters.
 HV1308
 HV1308.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1308.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1308
 HV1308.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1308.GEOID18 height accuracy estimate available here.
 HV1308
 HV1308.The vertical order pertains to the NGVD 29 superseded value.
 HV1308
 HV1308.Click photographs - Photos may exist for this station.
 HV1308
 HV1308
 HV1308_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3008903322(NAD 83)
 HV1308
 HV1308                          SUPERSEDED SURVEY CONTROL
 HV1308
 HV1308  NGVD 29 (11/26/84)   88.321  (m)          289.77   (f) ADJUSTED    2 0
 HV1308
 HV1308.Superseded values are not recommended for survey control.
 HV1308
 HV1308.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1308.See file dsdata.pdf to determine how the superseded data were derived.
 HV1308
 HV1308_MARKER: B = BOLT
 HV1308_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1308_SP_SET: STEP
 HV1308_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1308
 HV1308  HISTORY     - Date     Condition        Report By
 HV1308  HISTORY     - 1944     MONUMENTED       WSSC
 HV1308
 HV1308                          STATION DESCRIPTION
 HV1308
 HV1308'DESCRIBED BY WASH SUBURB SAN COMM 1944
 HV1308'IN WASHINGTON.
 HV1308'ON ALABAMA AVENUE, 0.4 MILE WEST OF PENNSYLVANIA AVENUE, ABOUT
 HV1308'200 FEET EAST OF BRANCH AVENUE, AT A CHURCH ON THE NORTH SIDE
 HV1308'OF ALABAMA AVENUE, AND IN THE WEST END OF THE SECOND CONCRETE STEP.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1401 ***********************************************************************
 HV1401  DESIGNATION -  14=ORDNANCE
 HV1401  PID         -  HV1401
 HV1401  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1401  COUNTRY     -  US
 HV1401  USGS QUAD   -  ANACOSTIA (2016)
 HV1401
 HV1401                         *CURRENT SURVEY CONTROL
 HV1401  ______________________________________________________________________
 HV1401* NAD 83(1986) POSITION- 38 52 28.1    (N) 076 59 41.8    (W)   HD_HELD2
 HV1401* NAVD 88 ORTHO HEIGHT -     4.707 (meters)       15.44  (feet) ADJUSTED
 HV1401  ______________________________________________________________________
 HV1401  GEOID HEIGHT    -        -32.181 (meters)                     GEOID18
 HV1401  DYNAMIC HEIGHT  -          4.705 (meters)       15.44  (feet) COMP
 HV1401  MODELED GRAVITY -    980,096.3   (mgal)                       NAVD 88
 HV1401
 HV1401  VERT ORDER      -  FIRST     CLASS II
 HV1401
 HV1401.The horizontal coordinates were established by autonomous hand held GPS
 HV1401.observations and have an estimated accuracy of +/- 10 meters.
 HV1401
 HV1401.The orthometric height was determined by differential leveling and
 HV1401.adjusted by the NATIONAL GEODETIC SURVEY
 HV1401.in June 1991.
 HV1401
 HV1401.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1401.GEOID18 height accuracy estimate available here.
 HV1401
 HV1401.Click photographs - Photos may exist for this station.
 HV1401
 HV1401.The dynamic height is computed by dividing the NAVD 88
 HV1401.geopotential number by the normal gravity value computed on the
 HV1401.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1401.degrees latitude (g = 980.6199 gals.).
 HV1401
 HV1401.The modeled gravity was interpolated from observed gravity values.
 HV1401
 HV1401
 HV1401_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2694104738(NAD 83)
 HV1401
 HV1401                          SUPERSEDED SURVEY CONTROL
 HV1401
 HV1401  NGVD 29 (11/26/84)    4.948  (m)           16.23   (f) ADJUSTED    1 2
 HV1401
 HV1401.Superseded values are not recommended for survey control.
 HV1401
 HV1401.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1401.See file dsdata.pdf to determine how the superseded data were derived.
 HV1401
 HV1401_MARKER: Q = CHISELED SQUARE
 HV1401_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1401_SP_SET: STEP
 HV1401_MARK LOGO: NONE
 HV1401_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1401_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1401_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1401+SATELLITE: SATELLITE OBSERVATIONS - March 15, 2012
 HV1401
 HV1401  HISTORY     - Date     Condition        Report By
 HV1401  HISTORY     - UNK      MONUMENTED       CGS
 HV1401  HISTORY     - 1927     GOOD             CGS
 HV1401  HISTORY     - 1955     GOOD             CGS
 HV1401  HISTORY     - 20010716 GOOD             NGS
 HV1401  HISTORY     - 20120315 GOOD             GEOCAC
 HV1401
 HV1401                          STATION DESCRIPTION
 HV1401
 HV1401'DESCRIBED BY COAST AND GEODETIC SURVEY 1927
 HV1401'IN WASHINGTON.
 HV1401'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1401'ON DAHLGREN AVENUE, ON THE WEST SIDE OF BUILDING 44 (THE ORDNANCE
 HV1401'OFFICE), IN THE GRANITE STEP OF THE SOUTH DOORWAY, AND 0.4 FOOT
 HV1401'SOUTH OF THE NORTH END OF THE STEP.  A ONE-INCH CHISELED SQUARE
 HV1401'MARKED BY THE CHISELED LETTERS USC AND GS.
 HV1401
 HV1401                          STATION RECOVERY (1955)
 HV1401
 HV1401'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1401'RECOVERED IN GOOD CONDITION.
 HV1401
 HV1401                          STATION RECOVERY (2001)
 HV1401
 HV1401'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 HV1401'RECOVERED AS DESCRIBED.
 HV1401
 HV1401                          STATION RECOVERY (2012)
 HV1401
 HV1401'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV1401'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4519 ***********************************************************************
 HV4519  DESIGNATION -  15 CON
 HV4519  PID         -  HV4519
 HV4519  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4519  COUNTRY     -  US
 HV4519  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4519
 HV4519                         *CURRENT SURVEY CONTROL
 HV4519  ______________________________________________________________________
 HV4519* NAD 83(1993) POSITION- 38 53 32.13963(N) 077 02 00.55815(W)   ADJUSTED
 HV4519* NAVD 88 ORTHO HEIGHT -     1.9   (meters)        6.    (feet) VERTCON3
 HV4519  ______________________________________________________________________
 HV4519  GEOID HEIGHT    -        -32.085 (meters)                     GEOID18
 HV4519  LAPLACE CORR    -         -2.50  (seconds)                    DEFLEC18
 HV4519  HORZ ORDER      -  SECOND
 HV4519
 HV4519.The horizontal coordinates were established by classical geodetic methods
 HV4519.and adjusted by the National Geodetic Survey in November 1994.
 HV4519
 HV4519.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4519.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4519
 HV4519.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4519.GEOID18 height accuracy estimate available here.
 HV4519
 HV4519.Click photographs - Photos may exist for this station.
 HV4519
 HV4519.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4519
 HV4519. The following values were computed from the NAD 83(1993) position.
 HV4519
 HV4519;                    North         East     Units Scale Factor Converg.
 HV4519;SPC MD       -   136,046.745   397,094.774   MT  0.99994989   -0 01 15.7
 HV4519;SPC MD       -   446,346.70  1,302,801.77   sFT  0.99994989   -0 01 15.7
 HV4519;SPC VA N     - 2,137,057.227 3,627,220.544   MT  0.99995985   +0 54 55.0
 HV4519;SPC VA N     - 7,011,328.59 11,900,306.07   sFT  0.99995985   +0 54 55.0
 HV4519;UTM  18      - 4,306,786.165   323,642.031   MT  0.99998300   -1 16 37.5
 HV4519
 HV4519!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4519!SPC MD       -   1.00000474  x   0.99994989  =   0.99995463
 HV4519!SPC VA N     -   1.00000474  x   0.99995985  =   0.99996459
 HV4519!UTM  18      -   1.00000474  x   0.99998300  =   0.99998774
 HV4519
 HV4519:                Primary Azimuth Mark                     Grid Az
 HV4519:SPC MD       -  15 CON AZ MK                             000 21 43.5
 HV4519:SPC VA N     -  15 CON AZ MK                             359 25 32.8
 HV4519:UTM  18      -  15 CON AZ MK                             001 37 05.3
 HV4519
 HV4519_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2364206786(NAD 83)
 HV4519
 HV4519|---------------------------------------------------------------------|
 HV4519| PID    Reference Object                     Distance      Geod. Az  |
 HV4519|                                                           dddmmss.s |
 HV4519| HV4518 15 E                                341.856 METERS 00015     |
 HV4519| DC6614 15 CON AZ MK                                       0002027.8 |
 HV4519| HV4521 WMG 1981                            290.514 METERS 19637     |
 HV4519|---------------------------------------------------------------------|
 HV4519
 HV4519                          SUPERSEDED SURVEY CONTROL
 HV4519
 HV4519  NAD 83(1991)-  38 53 32.13848(N)    077 02 00.55941(W) AD(       ) 2
 HV4519  NAD 83(1986)-  38 53 32.13805(N)    077 02 00.57008(W) AD(       ) 2
 HV4519  NAD 27      -  38 53 31.73873(N)    077 02 01.64943(W) AD(       ) 2
 HV4519  NGVD 29 (07/19/86)    2.1    (m)            7.     (f) VERT ANG       
 HV4519
 HV4519.Superseded values are not recommended for survey control.
 HV4519
 HV4519.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4519.See file dsdata.pdf to determine how the superseded data were derived.
 HV4519
 HV4519_MARKER: DD = SURVEY DISK
 HV4519_SETTING: 0 = UNSPECIFIED SETTING
 HV4519
 HV4519  HISTORY     - Date     Condition        Report By
 HV4519  HISTORY     - 1981     MONUMENTED       CANDA
 HV4519
 HV4519                          STATION DESCRIPTION
 HV4519
 HV4519'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4519'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE
 HV4519'LETTER C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4519'
 HV4519'STATION IS LOCATED IN THE SIDEWALK ON THE NORTHEAST CORNER OF 15TH
 HV4519'STREET N.W. AND CONSTITUTION AVE. N.W.
 HV4519'
 HV4519'STATION IS 12.94 FT NE OF X ON RIM PEPCO M.H.
 HV4519'
 HV4519'STATION IS 20.34 FT NW OF SIGNAL POST BASE ON CON. AVE.
 HV4519'
 HV4519'STATION IS 8.56 FT SE OF SIGNAL POST BASE ON 15TH STREET.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4518 ***********************************************************************
 HV4518  DESIGNATION -  15 E
 HV4518  PID         -  HV4518
 HV4518  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4518  COUNTRY     -  US
 HV4518  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4518
 HV4518                         *CURRENT SURVEY CONTROL
 HV4518  ______________________________________________________________________
 HV4518* NAD 83(1993) POSITION- 38 53 43.22539(N) 077 02 00.49529(W)   ADJUSTED
 HV4518* NAVD 88 ORTHO HEIGHT -     4.74  (+/-2cm)       15.6   (feet) VERTCON3
 HV4518  ______________________________________________________________________
 HV4518  GEOID HEIGHT    -        -32.079 (meters)                     GEOID18
 HV4518  LAPLACE CORR    -         -2.45  (seconds)                    DEFLEC18
 HV4518  HORZ ORDER      -  SECOND
 HV4518  VERT ORDER      -  THIRD ? (See Below)
 HV4518
 HV4518.The horizontal coordinates were established by classical geodetic methods
 HV4518.and adjusted by the National Geodetic Survey in November 1994.
 HV4518
 HV4518.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4518.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4518
 HV4518.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4518.GEOID18 height accuracy estimate available here.
 HV4518
 HV4518.The vertical order pertains to the NGVD 29 superseded value.
 HV4518
 HV4518.Click photographs - Photos may exist for this station.
 HV4518
 HV4518.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4518
 HV4518. The following values were computed from the NAD 83(1993) position.
 HV4518
 HV4518;                    North         East     Units Scale Factor Converg.
 HV4518;SPC MD       -   136,388.579   397,096.414   MT  0.99994991   -0 01 15.6
 HV4518;SPC MD       -   447,468.20  1,302,807.15   sFT  0.99994991   -0 01 15.6
 HV4518;SPC VA N     - 2,137,399.047 3,627,216.598   MT  0.99996011   +0 54 55.0
 HV4518;SPC VA N     - 7,012,450.04 11,900,293.12   sFT  0.99996011   +0 54 55.0
 HV4518;UTM  18      - 4,307,127.893   323,651.164   MT  0.99998296   -1 16 37.7
 HV4518
 HV4518!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4518!SPC MD       -   1.00000429  x   0.99994991  =   0.99995420
 HV4518!SPC VA N     -   1.00000429  x   0.99996011  =   0.99996440
 HV4518!UTM  18      -   1.00000429  x   0.99998296  =   0.99998725
 HV4518
 HV4518:                Primary Azimuth Mark                     Grid Az
 HV4518:SPC MD       -  15 E AZ MK                               349 57 50.8
 HV4518:SPC VA N     -  15 E AZ MK                               349 01 40.2
 HV4518:UTM  18      -  15 E AZ MK                               351 13 12.9
 HV4518
 HV4518_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2365107127(NAD 83)
 HV4518
 HV4518|---------------------------------------------------------------------|
 HV4518| PID    Reference Object                     Distance      Geod. Az  |
 HV4518|                                                           dddmmss.s |
 HV4518| HV4517 WP                                  224.584 METERS 07738     |
 HV4518| HV4519 15 CON                              341.856 METERS 18015     |
 HV4518| DC6615 15 E AZ MK                                         3495635.2 |
 HV4518| HV4520 15 F                                225.943 METERS 35144     |
 HV4518|---------------------------------------------------------------------|
 HV4518
 HV4518                          SUPERSEDED SURVEY CONTROL
 HV4518
 HV4518  NAD 83(1991)-  38 53 43.22423(N)    077 02 00.49655(W) AD(       ) 2
 HV4518  NAD 83(1986)-  38 53 43.22381(N)    077 02 00.50718(W) AD(       ) 2
 HV4518  NAD 27      -  38 53 42.82454(N)    077 02 01.58631(W) AD(       ) 2
 HV4518  NGVD 29 (07/19/86)    4.98   (m)           16.3    (f) LEVELING    3  
 HV4518
 HV4518.Superseded values are not recommended for survey control.
 HV4518
 HV4518.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4518.See file dsdata.pdf to determine how the superseded data were derived.
 HV4518
 HV4518_MARKER: DD = SURVEY DISK
 HV4518_SETTING: 0 = UNSPECIFIED SETTING
 HV4518
 HV4518  HISTORY     - Date     Condition        Report By
 HV4518  HISTORY     - 1981     MONUMENTED       CANDA
 HV4518
 HV4518                          STATION DESCRIPTION
 HV4518
 HV4518'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4518'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4518'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4518'
 HV4518'STATION IS LOCATED IN THE SIDEWALK ON THE SOUTHEAST CORNER OF 15TH
 HV4518'STREET N.W. AND E STREET N.W.
 HV4518'
 HV4518'STATION IS 14.34 FT NE OF X IN RIM OF M.H. ON 15TH STREET.
 HV4518'
 HV4518'STATION IS 15.27 FT NW OF X IN RIM OF M.H.
 HV4518'
 HV4518'STATION IS 31.18 FT SW OF FIRE HYDRANT ON E STREET.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4520 ***********************************************************************
 HV4520  DESIGNATION -  15 F
 HV4520  PID         -  HV4520
 HV4520  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4520  COUNTRY     -  US
 HV4520  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4520
 HV4520                         *CURRENT SURVEY CONTROL
 HV4520  ______________________________________________________________________
 HV4520* NAD 83(1993) POSITION- 38 53 50.47641(N) 077 02 01.84210(W)   ADJUSTED
 HV4520* NAVD 88 ORTHO HEIGHT -    12.40  (+/-2cm)       40.7   (feet) VERTCON3
 HV4520  ______________________________________________________________________
 HV4520  GEOID HEIGHT    -        -32.074 (meters)                     GEOID18
 HV4520  LAPLACE CORR    -         -2.40  (seconds)                    DEFLEC18
 HV4520  HORZ ORDER      -  SECOND
 HV4520  VERT ORDER      -  THIRD ? (See Below)
 HV4520
 HV4520.The horizontal coordinates were established by classical geodetic methods
 HV4520.and adjusted by the National Geodetic Survey in November 1994.
 HV4520
 HV4520.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4520.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4520
 HV4520.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4520.GEOID18 height accuracy estimate available here.
 HV4520
 HV4520.The vertical order pertains to the NGVD 29 superseded value.
 HV4520
 HV4520.Click photographs - Photos may exist for this station.
 HV4520
 HV4520.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4520
 HV4520. The following values were computed from the NAD 83(1993) position.
 HV4520
 HV4520;                    North         East     Units Scale Factor Converg.
 HV4520;SPC MD       -   136,612.180   397,064.043   MT  0.99994992   -0 01 16.5
 HV4520;SPC MD       -   448,201.79  1,302,700.95   sFT  0.99994992   -0 01 16.5
 HV4520;SPC VA N     - 2,137,622.091 3,627,180.577   MT  0.99996028   +0 54 54.2
 HV4520;SPC VA N     - 7,013,181.81 11,900,174.94   sFT  0.99996028   +0 54 54.2
 HV4520;UTM  18      - 4,307,352.157   323,623.702   MT  0.99998308   -1 16 38.8
 HV4520
 HV4520!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4520!SPC MD       -   1.00000309  x   0.99994992  =   0.99995301
 HV4520!SPC VA N     -   1.00000309  x   0.99996028  =   0.99996337
 HV4520!UTM  18      -   1.00000309  x   0.99998308  =   0.99998617
 HV4520
 HV4520:                Primary Azimuth Mark                     Grid Az
 HV4520:SPC MD       -  15 F AZ MK                               013 16 10.9
 HV4520:SPC VA N     -  15 F AZ MK                               012 20 00.2
 HV4520:UTM  18      -  15 F AZ MK                               014 31 33.2
 HV4520
 HV4520_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2362307352(NAD 83)
 HV4520
 HV4520|---------------------------------------------------------------------|
 HV4520| PID    Reference Object                     Distance      Geod. Az  |
 HV4520|                                                           dddmmss.s |
 HV4520| DC6616 15 F AZ MK                                         0131454.4 |
 HV4520| HV4515 13 F                                379.608 METERS 08815     |
 HV4520| HV4518 15 E                                225.943 METERS 17144     |
 HV4520|---------------------------------------------------------------------|
 HV4520
 HV4520                          SUPERSEDED SURVEY CONTROL
 HV4520
 HV4520  NAD 83(1991)-  38 53 50.47526(N)    077 02 01.84335(W) AD(       ) 2
 HV4520  NAD 83(1986)-  38 53 50.47484(N)    077 02 01.85396(W) AD(       ) 2
 HV4520  NAD 27      -  38 53 50.07569(N)    077 02 02.93290(W) AD(       ) 2
 HV4520  NGVD 29 (07/19/86)   12.64   (m)           41.5    (f) LEVELING    3  
 HV4520
 HV4520.Superseded values are not recommended for survey control.
 HV4520
 HV4520.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4520.See file dsdata.pdf to determine how the superseded data were derived.
 HV4520
 HV4520
 HV4520  HISTORY     - Date     Condition        Report By
 HV4520  HISTORY     - 1981     MONUMENTED       CANDA
 HV4520  HISTORY     - 20180718 MARK NOT FOUND   USPSQD
 HV4520
 HV4520                          STATION DESCRIPTION
 HV4520
 HV4520'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4520'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4520'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4520'
 HV4520'STATION IS LOCATED IN THE GRANITE WALL ON THE EAST SIDE OF THE
 HV4520'TREASURY BUILDING AT THE INTERSECTION OF 15TH STREET N.W. AND F
 HV4520'STREET N.W.
 HV4520'
 HV4520'STATION IS 31.32 FT. NW OF X ON RIM OF M.H IN 15TH STREET.
 HV4520'
 HV4520'STATION IS 33.08 FT SW OF SIGNAL POST BASE ON 15TH STREET.
 HV4520
 HV4520                          STATION RECOVERY (2018)
 HV4520
 HV4520'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV4520'SEARCHED AREA ALONG THE WALL AND SIDEWALK AND FOUND NO SIGN OF THE
 HV4520'MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1390 ***********************************************************************
 HV1390  DESIGNATION -  159 A NGF
 HV1390  PID         -  HV1390
 HV1390  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1390  COUNTRY     -  US
 HV1390  USGS QUAD   -  ALEXANDRIA (2019)
 HV1390
 HV1390                         *CURRENT SURVEY CONTROL
 HV1390  ______________________________________________________________________
 HV1390* NAD 83(1986) POSITION- 38 52 28.     (N) 077 00 12.     (W)   SCALED
 HV1390* NAVD 88 ORTHO HEIGHT -     3.11  (+/-2cm)       10.2   (feet) VERTCON3
 HV1390  ______________________________________________________________________
 HV1390  GEOID HEIGHT    -        -32.167 (meters)                     GEOID18
 HV1390  VERT ORDER      -  ? (See Below)
 HV1390
 HV1390.The horizontal coordinates were scaled from a map and have
 HV1390.an estimated accuracy of +/- 6 seconds.
 HV1390
 HV1390.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1390.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1390
 HV1390.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1390.GEOID18 height accuracy estimate available here.
 HV1390
 HV1390.The vertical order pertains to the NGVD 29 superseded value.
 HV1390
 HV1390.Click photographs - Photos may exist for this station.
 HV1390
 HV1390
 HV1390_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ262047(NAD 83)
 HV1390
 HV1390                          SUPERSEDED SURVEY CONTROL
 HV1390
 HV1390  NGVD 29 (11/26/84)    3.356  (m)           11.01   (f) ADJUSTED       
 HV1390
 HV1390.Superseded values are not recommended for survey control.
 HV1390
 HV1390.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1390.See file dsdata.pdf to determine how the superseded data were derived.
 HV1390
 HV1390_MARKER: DD = SURVEY DISK
 HV1390_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1390_SP_SET: FOOTING
 HV1390_STAMPING: NO 159 A 1955
 HV1390_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1390
 HV1390  HISTORY     - Date     Condition        Report By
 HV1390  HISTORY     - 1955     MONUMENTED       USN
 HV1390  HISTORY     - 1955     GOOD             CGS
 HV1390  HISTORY     - 19950811 MARK NOT FOUND   USPSQD
 HV1390
 HV1390                          STATION DESCRIPTION
 HV1390
 HV1390'DESCRIBED BY COAST AND GEODETIC SURVEY 1955
 HV1390'IN WASHINGTON.
 HV1390'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1390'SOUTHEAST OF BUILDING 159, AT THE THIRTEENTH BENT FROM THE
 HV1390'SOUTH END OF THE CRANE RUNWAY ADJACENT TO THE BUILDING, ON THE
 HV1390'WEST SIDE OF THE CRANE RUNWAY, AND IN THE WEST CONCRETE
 HV1390'FOOTING.  A NAVAL GUN FACTORY STANDARD DISK, STAMPED NO 159
 HV1390'A 1955.
 HV1390
 HV1390                          STATION RECOVERY (1995)
 HV1390
 HV1390'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1390'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1391 ***********************************************************************
 HV1391  DESIGNATION -  159 WNY
 HV1391  PID         -  HV1391
 HV1391  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1391  COUNTRY     -  US
 HV1391  USGS QUAD   -  ALEXANDRIA (2019)
 HV1391
 HV1391                         *CURRENT SURVEY CONTROL
 HV1391  ______________________________________________________________________
 HV1391* NAD 83(1986) POSITION- 38 52 28.     (N) 077 00 13.     (W)   SCALED
 HV1391* NAVD 88 ORTHO HEIGHT -     3.95  (+/-2cm)       13.0   (feet) VERTCON3
 HV1391  ______________________________________________________________________
 HV1391  GEOID HEIGHT    -        -32.167 (meters)                     GEOID18
 HV1391  VERT ORDER      -  ? (See Below)
 HV1391
 HV1391.The horizontal coordinates were scaled from a map and have
 HV1391.an estimated accuracy of +/- 6 seconds.
 HV1391
 HV1391.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1391.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1391
 HV1391.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1391.GEOID18 height accuracy estimate available here.
 HV1391
 HV1391.The vertical order pertains to the NGVD 29 superseded value.
 HV1391
 HV1391.Click photographs - Photos may exist for this station.
 HV1391
 HV1391
 HV1391_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ261047(NAD 83)
 HV1391
 HV1391                          SUPERSEDED SURVEY CONTROL
 HV1391
 HV1391  NGVD 29 (11/26/84)    4.191  (m)           13.75   (f) ADJUSTED       
 HV1391
 HV1391.Superseded values are not recommended for survey control.
 HV1391
 HV1391.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1391.See file dsdata.pdf to determine how the superseded data were derived.
 HV1391
 HV1391_MARKER: DD = SURVEY DISK
 HV1391_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1391_SP_SET: CONC LOADING PLATFORM
 HV1391_STAMPING: NO 159 1940
 HV1391_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1391
 HV1391  HISTORY     - Date     Condition        Report By
 HV1391  HISTORY     - 1940     MONUMENTED       USN
 HV1391  HISTORY     - 1942     GOOD             CGS
 HV1391  HISTORY     - 1955     GOOD             CGS
 HV1391  HISTORY     - 19950811 MARK NOT FOUND   USPSQD
 HV1391
 HV1391                          STATION DESCRIPTION
 HV1391
 HV1391'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1391'IN WASHINGTON.
 HV1391'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1391'AT THE SOUTH END OF BUILDING 159, AT THE EAST END OF THE CONCRETE
 HV1391'LOADING PLATFORM, IN THE ENTRANCE, 0.4 FOOT EAST OF THE WEST
 HV1391'EDGE OF THE DOORWAY, AND 0.2 FOOT SOUTH OF THE FACE OF THE
 HV1391'DOOR.  A WASHINGTON NAVY YARD STANDARD DISK, STAMPED NO 159 1940.
 HV1391
 HV1391                          STATION RECOVERY (1955)
 HV1391
 HV1391'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1391'RECOVERED IN GOOD CONDITION.
 HV1391
 HV1391                          STATION RECOVERY (1995)
 HV1391
 HV1391'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1391'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1336 ***********************************************************************
 HV1336  DESIGNATION -  1617 WSSC
 HV1336  PID         -  HV1336
 HV1336  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1336  COUNTRY     -  US
 HV1336  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1336
 HV1336                         *CURRENT SURVEY CONTROL
 HV1336  ______________________________________________________________________
 HV1336* NAD 83(1986) POSITION- 38 54 44.     (N) 076 56 05.     (W)   SCALED
 HV1336* NAVD 88 ORTHO HEIGHT -    12.38  (+/-2cm)       40.6   (feet) VERTCON3
 HV1336  ______________________________________________________________________
 HV1336  GEOID HEIGHT    -        -32.243 (meters)                     GEOID18
 HV1336  VERT ORDER      -  SECOND    CLASS 0 (See Below)
 HV1336
 HV1336.The horizontal coordinates were scaled from a map and have
 HV1336.an estimated accuracy of +/- 6 seconds.
 HV1336
 HV1336.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1336.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1336
 HV1336.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1336.GEOID18 height accuracy estimate available here.
 HV1336
 HV1336.The vertical order pertains to the NGVD 29 superseded value.
 HV1336
 HV1336.Click photographs - Photos may exist for this station.
 HV1336
 HV1336
 HV1336_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ322088(NAD 83)
 HV1336
 HV1336                          SUPERSEDED SURVEY CONTROL
 HV1336
 HV1336  NGVD 29 (11/26/84)   12.613  (m)           41.38   (f) ADJUSTED    2 0
 HV1336
 HV1336.Superseded values are not recommended for survey control.
 HV1336
 HV1336.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1336.See file dsdata.pdf to determine how the superseded data were derived.
 HV1336
 HV1336_MARKER: DD = SURVEY DISK
 HV1336_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1336_SP_SET: PUMPING STATION
 HV1336_STAMPING: 1617
 HV1336_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1336
 HV1336  HISTORY     - Date     Condition        Report By
 HV1336  HISTORY     - UNK      MONUMENTED       WSSC
 HV1336  HISTORY     - 1944     GOOD             WSSC
 HV1336
 HV1336                          STATION DESCRIPTION
 HV1336
 HV1336'DESCRIBED BY WASH SUBURB SAN COMM 1944
 HV1336'NEAR MD DC LINE.
 HV1336'ON KENILWORTH AVENUE, IN THE SOUTH END OF A W.S.S.D. PUMPING
 HV1336'STATION, ON THE WEST SIDE OF THE ROAD, 45 FEET WEST OF THE
 HV1336'SOUTHEAST CORNER OF THE STATION, AND ABOUT 1 FOOT ABOVE
 HV1336'THE GROUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ5419 ***********************************************************************
 AJ5419  DESIGNATION -  169+03
 AJ5419  PID         -  AJ5419
 AJ5419  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ5419  COUNTRY     -  US
 AJ5419  USGS QUAD   -  ANACOSTIA (2016)
 AJ5419
 AJ5419                         *CURRENT SURVEY CONTROL
 AJ5419  ______________________________________________________________________
 AJ5419* NAD 83(1986) POSITION- 38 51 54.     (N) 076 59 47.     (W)   SCALED
 AJ5419* NAVD 88 ORTHO HEIGHT -   -11.362 (meters)      -37.28  (feet) ADJUSTED
 AJ5419  ______________________________________________________________________
 AJ5419  GEOID HEIGHT    -        -32.194 (meters)                     GEOID18
 AJ5419  DYNAMIC HEIGHT  -        -11.356 (meters)      -37.26  (feet) COMP
 AJ5419  MODELED GRAVITY -    980,094.0   (mgal)                       NAVD 88
 AJ5419
 AJ5419  VERT ORDER      -  SECOND    CLASS I
 AJ5419
 AJ5419.The horizontal coordinates were scaled from a map and have
 AJ5419.an estimated accuracy of +/- 6 seconds.
 AJ5419
 AJ5419.The orthometric height was determined by differential leveling and
 AJ5419.adjusted by the NATIONAL GEODETIC SURVEY
 AJ5419.in October 2001.
 AJ5419
 AJ5419.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ5419.GEOID18 height accuracy estimate available here.
 AJ5419
 AJ5419.Click photographs - Photos may exist for this station.
 AJ5419
 AJ5419.The dynamic height is computed by dividing the NAVD 88
 AJ5419.geopotential number by the normal gravity value computed on the
 AJ5419.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ5419.degrees latitude (g = 980.6199 gals.).
 AJ5419
 AJ5419.The modeled gravity was interpolated from observed gravity values.
 AJ5419
 AJ5419
 AJ5419_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ267036(NAD 83)
 AJ5419
 AJ5419                          SUPERSEDED SURVEY CONTROL
 AJ5419
 AJ5419.No superseded survey control is available for this station.
 AJ5419
 AJ5419_MARKER: DD = SURVEY DISK
 AJ5419_SETTING: 35 = SET IN A MAT FOUNDATION OR CONCRETE SLAB OTHER THAN
 AJ5419+WITH SETTING: PAVEMENT
 AJ5419_SP_SET: SAFETY WALKWAY
 AJ5419_STAMPING: 169+03
 AJ5419_MARK LOGO: NONE
 AJ5419_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ5419_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AJ5419+STABILITY: SURFACE MOTION
 AJ5419
 AJ5419  HISTORY     - Date     Condition        Report By
 AJ5419  HISTORY     - UNK      MONUMENTED       NONE
 AJ5419  HISTORY     - 20010806 GOOD             NGS
 AJ5419
 AJ5419                          STATION DESCRIPTION
 AJ5419
 AJ5419'DESCRIBED BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 AJ5419'FROM INTERSTATE 295 SOUTH AND HOWARD ROAD EXIT (3B) IN WASHINGTON DC
 AJ5419'GO SOUTHWEST 0.15 MILE (0.24 KM) ALONG EXIT RAMP (STAY IN RIGHT LANE)
 AJ5419'TO JUNCTION OF HOWARD ROAD, TURN EXTREME RIGHT ONTO A PAVED ROAD
 AJ5419'NORTHEAST FOR 0.10 MILE (0.16 KM) TO MARK AT THE ENTRANCE TO THE
 AJ5419'ANACOSTIA METRO STATION, THENCE GO THROUGH THE ENTRANCE AND DOWN TO
 AJ5419'BOTTOM OF THE ESCALATORS AT THE OUTBOUND TRACKS, THENCE 0.8 MILE (1.3
 AJ5419'KM) SOUTHEAST ALONG THE OUTBOUND TRACKS TO MARK ON LEFT, 0.8 FT (24.4
 AJ5419'CM) WESTERLY OF THE EDGE OF WALKWAY.  APPROXIMATELY 2.0 FEET (0.6 M)
 AJ5419'ABOVE TRACKS.  NOTE--0.32 KM SOUTHEAST OF ANA 2.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1785 ***********************************************************************
 HV1785  DESIGNATION -  1707
 HV1785  PID         -  HV1785
 HV1785  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1785  COUNTRY     -  US
 HV1785  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1785
 HV1785                         *CURRENT SURVEY CONTROL
 HV1785  ______________________________________________________________________
 HV1785* NAD 83(1986) POSITION- 38 58 40.     (N) 077 01 10.     (W)   SCALED
 HV1785* NAVD 88 ORTHO HEIGHT -    91.887 (meters)      301.47  (feet) ADJUSTED
 HV1785  ______________________________________________________________________
 HV1785  GEOID HEIGHT    -        -31.993 (meters)                     GEOID18
 HV1785  DYNAMIC HEIGHT  -         91.838 (meters)      301.31  (feet) COMP
 HV1785  MODELED GRAVITY -    980,090.9   (mgal)                       NAVD 88
 HV1785
 HV1785  VERT ORDER      -  SECOND    CLASS 0
 HV1785
 HV1785.The horizontal coordinates were scaled from a map and have
 HV1785.an estimated accuracy of +/- 6 seconds.
 HV1785
 HV1785.The orthometric height was determined by differential leveling and
 HV1785.adjusted by the NATIONAL GEODETIC SURVEY
 HV1785.in June 1991.
 HV1785
 HV1785.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1785.GEOID18 height accuracy estimate available here.
 HV1785
 HV1785.Click photographs - Photos may exist for this station.
 HV1785
 HV1785.The dynamic height is computed by dividing the NAVD 88
 HV1785.geopotential number by the normal gravity value computed on the
 HV1785.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1785.degrees latitude (g = 980.6199 gals.).
 HV1785
 HV1785.The modeled gravity was interpolated from observed gravity values.
 HV1785
 HV1785
 HV1785_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ250162(NAD 83)
 HV1785
 HV1785                          SUPERSEDED SURVEY CONTROL
 HV1785
 HV1785  NGVD 29 (11/26/84)   92.117  (m)          302.22   (f) ADJUSTED    2 0
 HV1785
 HV1785.Superseded values are not recommended for survey control.
 HV1785
 HV1785.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1785.See file dsdata.pdf to determine how the superseded data were derived.
 HV1785
 HV1785_MARKER: DD = SURVEY DISK
 HV1785_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1785_SP_SET: STEP
 HV1785_STAMPING: 1707
 HV1785_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1785
 HV1785  HISTORY     - Date     Condition        Report By
 HV1785  HISTORY     - UNK      MONUMENTED       WSSC
 HV1785  HISTORY     - 1933     GOOD             CGS
 HV1785  HISTORY     - 1960     GOOD             CGS
 HV1785  HISTORY     - 19900406 MARK NOT FOUND   NGS
 HV1785
 HV1785                          STATION DESCRIPTION
 HV1785
 HV1785'DESCRIBED BY COAST AND GEODETIC SURVEY 1933
 HV1785'AT TAKOMA PARK.
 HV1785'AT TAKOMA PARK, D.C., ON THE METROPOLITAN BRANCH OF THE BALTIMORE
 HV1785'AND OHIO RAILROAD, ABOUT 1/4 MILE NORTH OF THE STATION, AT THE
 HV1785'SOUTH END OF THE BRIDGE CARRYING THE RAILROAD OVER PINEY BRANCH
 HV1785'ROAD, AT THE SOUTH END OF THE WEST RAILING, AND IN THE TOP OF A
 HV1785'STEP IN THE CONCRETE WALL.  A WASHINGTON SUBURBAN SANITARY DISTRICT
 HV1785'STANDARD DISK, STAMPED 1707.
 HV1785
 HV1785                          STATION RECOVERY (1960)
 HV1785
 HV1785'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1785'RECOVERED IN GOOD CONDITION.
 HV1785
 HV1785                          STATION RECOVERY (1990)
 HV1785
 HV1785'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990
 HV1785'A THOROUGH SEARCH OF THE DESCRIBED AREA REVEALED NO EVIDENCE OF THE
 HV1785'MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1355 ***********************************************************************
 HV1355  DESIGNATION -  1719 WSSC
 HV1355  PID         -  HV1355
 HV1355  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1355  COUNTRY     -  US
 HV1355  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1355
 HV1355                         *CURRENT SURVEY CONTROL
 HV1355  ______________________________________________________________________
 HV1355* NAD 83(1986) POSITION- 38 55 53.     (N) 076 57 33.     (W)   SCALED
 HV1355* NAVD 88 ORTHO HEIGHT -    26.52  (+/-2cm)       87.0   (feet) VERTCON3
 HV1355  ______________________________________________________________________
 HV1355  GEOID HEIGHT    -        -32.150 (meters)                     GEOID18
 HV1355  VERT ORDER      -  SECOND    CLASS 0 (See Below)
 HV1355
 HV1355.The horizontal coordinates were scaled from a map and have
 HV1355.an estimated accuracy of +/- 6 seconds.
 HV1355
 HV1355.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1355.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1355
 HV1355.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1355.GEOID18 height accuracy estimate available here.
 HV1355
 HV1355.The vertical order pertains to the NGVD 29 superseded value.
 HV1355
 HV1355.Click photographs - Photos may exist for this station.
 HV1355
 HV1355
 HV1355_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ301109(NAD 83)
 HV1355
 HV1355                          SUPERSEDED SURVEY CONTROL
 HV1355
 HV1355  NGVD 29 (11/26/84)   26.748  (m)           87.76   (f) ADJUSTED    2 0
 HV1355
 HV1355.Superseded values are not recommended for survey control.
 HV1355
 HV1355.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1355.See file dsdata.pdf to determine how the superseded data were derived.
 HV1355
 HV1355_MARKER: DD = SURVEY DISK
 HV1355_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1355_SP_SET: BRIDGE
 HV1355_STAMPING: 1719
 HV1355_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1355
 HV1355  HISTORY     - Date     Condition        Report By
 HV1355  HISTORY     - UNK      MONUMENTED       WSSC
 HV1355  HISTORY     - 1944     GOOD             WSSC
 HV1355
 HV1355                          STATION DESCRIPTION
 HV1355
 HV1355'DESCRIBED BY WASH SUBURB SAN COMM 1944
 HV1355'AT MD DC LINE.
 HV1355'ON EASTERN AVENUE, AT THE BRIDGE OVER THE BALTIMORE AND OHIO
 HV1355'RAILROAD, ON THE SOUTHWEST SIDE OF THE AVENUE, AND AT THE
 HV1355'NORTHWEST END OF THE BRIDGE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4490 ***********************************************************************
 HV4490  DESIGNATION -  17241 WSSC 1970
 HV4490  PID         -  HV4490
 HV4490  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4490  COUNTRY     -  US
 HV4490  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4490
 HV4490                         *CURRENT SURVEY CONTROL
 HV4490  ______________________________________________________________________
 HV4490* NAD 83(1991) POSITION- 38 58 00.00194(N) 077 00 12.59610(W)   ADJUSTED
 HV4490* NAVD 88 ORTHO HEIGHT -    73.3   (meters)      240.    (feet) VERTCON3
 HV4490  ______________________________________________________________________
 HV4490  GEOID HEIGHT    -        -32.023 (meters)                     GEOID18
 HV4490  LAPLACE CORR    -         -2.93  (seconds)                    DEFLEC18
 HV4490  HORZ ORDER      -  SECOND
 HV4490
 HV4490.The horizontal coordinates were established by classical geodetic methods
 HV4490.and adjusted by the National Geodetic Survey in January 1992.
 HV4490
 HV4490.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4490.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4490
 HV4490.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4490.GEOID18 height accuracy estimate available here.
 HV4490
 HV4490.Click photographs - Photos may exist for this station.
 HV4490
 HV4490.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4490
 HV4490. The following values were computed from the NAD 83(1991) position.
 HV4490
 HV4490;                    North         East     Units Scale Factor Converg.
 HV4490;SPC MD       -   144,305.947   399,696.774   MT  0.99995110   -0 00 07.9
 HV4490;SPC MD       -   473,443.76  1,311,338.50   sFT  0.99995110   -0 00 07.9
 HV4490;UTM  18      - 4,314,986.515   326,424.670   MT  0.99997100   -1 15 36.9
 HV4490
 HV4490!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4490!SPC MD       -   0.99999353  x   0.99995110  =   0.99994463
 HV4490!UTM  18      -   0.99999353  x   0.99997100  =   0.99996453
 HV4490
 HV4490:                Primary Azimuth Mark                     Grid Az
 HV4490:SPC MD       -  HYATTSVILLE RAD STA WRC MAST             102 22 00.8
 HV4490:UTM  18      -  HYATTSVILLE RAD STA WRC MAST             103 37 29.8
 HV4490
 HV4490_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2642414986(NAD 83)
 HV4490
 HV4490|---------------------------------------------------------------------|
 HV4490| PID    Reference Object                     Distance      Geod. Az  |
 HV4490|                                                           dddmmss.s |
 HV4490| HV4489 17242 WSSC 1970                     293.227 METERS 04318     |
 HV4490| HV7738 HYATTSVILLE RAD STA WRC MAST        APPROX. 2.7 KM 1022152.9 |
 HV4490|---------------------------------------------------------------------|
 HV4490
 HV4490                          SUPERSEDED SURVEY CONTROL
 HV4490
 HV4490  NAD 83(1986)-  38 58 00.00137(N)    077 00 12.60713(W) AD(       ) 2
 HV4490  NAD 27      -  38 57 59.60326(N)    077 00 13.69182(W) AD(       ) 2
 HV4490  NGVD 29 (07/19/86)   73.5    (m)          241.     (f) VERT ANG       
 HV4490
 HV4490.Superseded values are not recommended for survey control.
 HV4490
 HV4490.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4490.See file dsdata.pdf to determine how the superseded data were derived.
 HV4490
 HV4490_MARKER: I = METAL ROD
 HV4490_SETTING: 0 = UNSPECIFIED SETTING
 HV4490_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4490
 HV4490  HISTORY     - Date     Condition        Report By
 HV4490  HISTORY     - 1969     MONUMENTED       WSSC
 HV4490
 HV4490                          STATION DESCRIPTION
 HV4490
 HV4490'DESCRIBED BY WASH SUBURB SAN COMM 1969
 HV4490'THE STATION IS ABOUT 1 MILE SOUTH OF TAKOMA PARK 2 MILES NORTHWEST
 HV4490'OF AVONDALE.
 HV4490'
 HV4490'THE STATION IS LOCATED ON THE WEST SIDE OF SLIGO MILL ROAD ABOUT
 HV4490'175 FEET EAST OF SHERIDAN STREET IN THE PARKING LOT OF THE
 HV4490'MEDICAL ARTS BUILDING 6480.
 HV4490'
 HV4490'THE STATION MARK IS A CONCRETE MONUMENT WITH AN IRON ROD CENTER
 HV4490'AND IS 2 INCHES BELOW THE SURFACE.  IT IS 38.91 FEET SOUTHWEST OF
 HV4490'THE SOUTHWEST CORNER OF BUILDING 6480, 53.64 FEET EAST OF PEPCO
 HV4490'POLE 8147726 AND 2.2 FEET SOUTH OF THE SOUTH EDGE OF THE PARKING
 HV4490'LOT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1394 ***********************************************************************
 HV1394  DESIGNATION -  173 A NGF
 HV1394  PID         -  HV1394
 HV1394  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1394  COUNTRY     -  US
 HV1394  USGS QUAD   -  ALEXANDRIA (2019)
 HV1394
 HV1394                         *CURRENT SURVEY CONTROL
 HV1394  ______________________________________________________________________
 HV1394* NAD 83(1986) POSITION- 38 52 28.     (N) 077 00 05.     (W)   SCALED
 HV1394* NAVD 88 ORTHO HEIGHT -     2.90  (+/-2cm)        9.5   (feet) VERTCON3
 HV1394  ______________________________________________________________________
 HV1394  GEOID HEIGHT    -        -32.171 (meters)                     GEOID18
 HV1394  VERT ORDER      -  ? (See Below)
 HV1394
 HV1394.The horizontal coordinates were scaled from a map and have
 HV1394.an estimated accuracy of +/- 6 seconds.
 HV1394
 HV1394.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1394.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1394
 HV1394.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1394.GEOID18 height accuracy estimate available here.
 HV1394
 HV1394.The vertical order pertains to the NGVD 29 superseded value.
 HV1394
 HV1394.Click photographs - Photos may exist for this station.
 HV1394
 HV1394
 HV1394_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ263047(NAD 83)
 HV1394
 HV1394                          SUPERSEDED SURVEY CONTROL
 HV1394
 HV1394  NGVD 29 (11/26/84)    3.142  (m)           10.31   (f) ADJUSTED       
 HV1394
 HV1394.Superseded values are not recommended for survey control.
 HV1394
 HV1394.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1394.See file dsdata.pdf to determine how the superseded data were derived.
 HV1394
 HV1394_MARKER: DD = SURVEY DISK
 HV1394_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1394_SP_SET: MANHOLE SLAB
 HV1394_STAMPING: 173 A 1955
 HV1394_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1394
 HV1394  HISTORY     - Date     Condition        Report By
 HV1394  HISTORY     - 1955     MONUMENTED       USN
 HV1394  HISTORY     - 1955     GOOD             CGS
 HV1394  HISTORY     - 1955     GOOD             CGS
 HV1394  HISTORY     - 19950811 GOOD             USPSQD
 HV1394
 HV1394                          STATION DESCRIPTION
 HV1394
 HV1394'DESCRIBED BY COAST AND GEODETIC SURVEY 1955
 HV1394'IN WASHINGTON.
 HV1394'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1394'IN THE STREET BETWEEN BUILDINGS 173 AND 187, AND IN THE SOUTHEAST
 HV1394'CORNER OF A 6.5-FOOT-SQUARE CONCRETE ELECTRIC MANHOLE SLAB
 HV1394'(MANHOLE NO. 576).  A NAVAL GUN FACTORY STANDARD DISK, STAMPED
 HV1394'173 A 1955.
 HV1394
 HV1394                          STATION RECOVERY (1955)
 HV1394
 HV1394'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1394'RECOVERED IN GOOD CONDITION.
 HV1394
 HV1394                          STATION RECOVERY (1995)
 HV1394
 HV1394'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1394'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1393 ***********************************************************************
 HV1393  DESIGNATION -  173 WNY
 HV1393  PID         -  HV1393
 HV1393  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1393  COUNTRY     -  US
 HV1393  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1393
 HV1393                         *CURRENT SURVEY CONTROL
 HV1393  ______________________________________________________________________
 HV1393* NAD 83(1986) POSITION- 38 52 29.     (N) 077 00 05.     (W)   SCALED
 HV1393* NAVD 88 ORTHO HEIGHT -     3.06  (+/-2cm)       10.0   (feet) VERTCON3
 HV1393  ______________________________________________________________________
 HV1393  GEOID HEIGHT    -        -32.170 (meters)                     GEOID18
 HV1393  VERT ORDER      -  ? (See Below)
 HV1393
 HV1393.The horizontal coordinates were scaled from a map and have
 HV1393.an estimated accuracy of +/- 6 seconds.
 HV1393
 HV1393.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1393.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1393
 HV1393.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1393.GEOID18 height accuracy estimate available here.
 HV1393
 HV1393.The vertical order pertains to the NGVD 29 superseded value.
 HV1393
 HV1393.Click photographs - Photos may exist for this station.
 HV1393
 HV1393
 HV1393_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ263047(NAD 83)
 HV1393
 HV1393                          SUPERSEDED SURVEY CONTROL
 HV1393
 HV1393  NGVD 29 (11/26/84)    3.299  (m)           10.82   (f) ADJUSTED       
 HV1393
 HV1393.Superseded values are not recommended for survey control.
 HV1393
 HV1393.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1393.See file dsdata.pdf to determine how the superseded data were derived.
 HV1393
 HV1393_MARKER: DD = SURVEY DISK
 HV1393_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1393_SP_SET: CONC SLAB
 HV1393_STAMPING: NO 173 1940
 HV1393_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1393
 HV1393  HISTORY     - Date     Condition        Report By
 HV1393  HISTORY     - 1940     MONUMENTED       USN
 HV1393  HISTORY     - 1942     GOOD             CGS
 HV1393  HISTORY     - 1955     GOOD             CGS
 HV1393  HISTORY     - 19950811 MARK NOT FOUND   USPSQD
 HV1393
 HV1393                          STATION DESCRIPTION
 HV1393
 HV1393'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1393'IN WASHINGTON.
 HV1393'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1393'AT THE EAST SIDE OF BUILDING 173 A, IN A CONCRETE SLAB, 1.5
 HV1393'FEET SOUTH OF THE CENTERLINE OF THE FOURTH COLUMN FROM THE NORTH
 HV1393'END OF THE BUILDING, AND 0.7 FOOT EAST OF THE EAST FACE OF THE
 HV1393'COLUMN.  A WASHINGTON NAVY YARD STANDARD DISK, STAMPED NO 173
 HV1393'1940.
 HV1393
 HV1393                          STATION RECOVERY (1955)
 HV1393
 HV1393'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1393'RECOVERED IN GOOD CONDITION.
 HV1393
 HV1393                          STATION RECOVERY (1995)
 HV1393
 HV1393'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1393'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1405 ***********************************************************************
 HV1405  DESIGNATION -  189 WNY
 HV1405  PID         -  HV1405
 HV1405  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1405  COUNTRY     -  US
 HV1405  USGS QUAD   -  ANACOSTIA (2016)
 HV1405
 HV1405                         *CURRENT SURVEY CONTROL
 HV1405  ______________________________________________________________________
 HV1405* NAD 83(1986) POSITION- 38 52 18.     (N) 076 59 35.     (W)   SCALED
 HV1405* NAVD 88 ORTHO HEIGHT -     6.04  (+/-2cm)       19.8   (feet) VERTCON3
 HV1405  ______________________________________________________________________
 HV1405  GEOID HEIGHT    -        -32.189 (meters)                     GEOID18
 HV1405  VERT ORDER      -  ? (See Below)
 HV1405
 HV1405.The horizontal coordinates were scaled from a map and have
 HV1405.an estimated accuracy of +/- 6 seconds.
 HV1405
 HV1405.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1405.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1405
 HV1405.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1405.GEOID18 height accuracy estimate available here.
 HV1405
 HV1405.The vertical order pertains to the NGVD 29 superseded value.
 HV1405
 HV1405.Click photographs - Photos may exist for this station.
 HV1405
 HV1405
 HV1405_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ270044(NAD 83)
 HV1405
 HV1405                          SUPERSEDED SURVEY CONTROL
 HV1405
 HV1405  NGVD 29 (11/26/84)    6.285  (m)           20.62   (f) ADJUSTED       
 HV1405
 HV1405.Superseded values are not recommended for survey control.
 HV1405
 HV1405.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1405.See file dsdata.pdf to determine how the superseded data were derived.
 HV1405
 HV1405_MARKER: DB = BENCH MARK DISK
 HV1405_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1405_SP_SET: BUILDING
 HV1405_STAMPING: NO 189 1940
 HV1405_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1405
 HV1405  HISTORY     - Date     Condition        Report By
 HV1405  HISTORY     - 1940     MONUMENTED       USACE
 HV1405  HISTORY     - 1942     GOOD             CGS
 HV1405  HISTORY     - 1955     GOOD             CGS
 HV1405  HISTORY     - 19950811 MARK NOT FOUND   USPSQD
 HV1405
 HV1405                          STATION DESCRIPTION
 HV1405
 HV1405'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1405'IN WASHINGTON.
 HV1405'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN
 HV1405'FACTORY, ON 0 STREET NEAR THE ENTRANCE GATE, ON THE SOUTH SIDE
 HV1405'OF BUILDING 189, AT THE EAST DOORWAY, 0.4 FOOT WEST OF THE EAST
 HV1405'SIDE, AND 0.6 FOOT SOUTH OF THE DOOR.  A WASHINGTON NAVY YARD
 HV1405'STANDARD DISK, STAMPED NO 189 1940.
 HV1405
 HV1405                          STATION RECOVERY (1955)
 HV1405
 HV1405'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1405'RECOVERED IN GOOD CONDITION.
 HV1405
 HV1405                          STATION RECOVERY (1995)
 HV1405
 HV1405'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1405'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1334 ***********************************************************************
 HV1334  DESIGNATION -  1911 WSSC
 HV1334  PID         -  HV1334
 HV1334  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1334  COUNTRY     -  US
 HV1334  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1334
 HV1334                         *CURRENT SURVEY CONTROL
 HV1334  ______________________________________________________________________
 HV1334* NAD 83(1986) POSITION- 38 54 37.     (N) 076 55 55.     (W)   SCALED
 HV1334* NAVD 88 ORTHO HEIGHT -    13.61  (+/-2cm)       44.7   (feet) VERTCON3
 HV1334  ______________________________________________________________________
 HV1334  GEOID HEIGHT    -        -32.252 (meters)                     GEOID18
 HV1334  VERT ORDER      -  SECOND    CLASS 0 (See Below)
 HV1334
 HV1334.The horizontal coordinates were scaled from a map and have
 HV1334.an estimated accuracy of +/- 6 seconds.
 HV1334
 HV1334.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1334.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1334
 HV1334.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1334.GEOID18 height accuracy estimate available here.
 HV1334
 HV1334.The vertical order pertains to the NGVD 29 superseded value.
 HV1334
 HV1334.Click photographs - Photos may exist for this station.
 HV1334
 HV1334
 HV1334_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ324085(NAD 83)
 HV1334
 HV1334                          SUPERSEDED SURVEY CONTROL
 HV1334
 HV1334  NGVD 29 (11/26/84)   13.844  (m)           45.42   (f) ADJUSTED    2 0
 HV1334
 HV1334.Superseded values are not recommended for survey control.
 HV1334
 HV1334.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1334.See file dsdata.pdf to determine how the superseded data were derived.
 HV1334
 HV1334_MARKER: DD = SURVEY DISK
 HV1334_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1334_SP_SET: PLATFORM
 HV1334_STAMPING: 1911
 HV1334_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1334
 HV1334  HISTORY     - Date     Condition        Report By
 HV1334  HISTORY     - UNK      MONUMENTED       WSSC
 HV1334  HISTORY     - 1944     GOOD             WSSC
 HV1334
 HV1334                          STATION DESCRIPTION
 HV1334
 HV1334'DESCRIBED BY WASH SUBURB SAN COMM 1944
 HV1334'AT MD DC LINE.
 HV1334'AT THE BALTIMORE AND OHIO FREIGHT LINE OVER EASTERN AVENUE, ON THE
 HV1334'WEST SIDE OF THE FREIGHT LINE, AND IN THE SOUTH END OF THE
 HV1334'PLATFORM.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1386 ***********************************************************************
 HV1386  DESIGNATION -  197 N WNY
 HV1386  PID         -  HV1386
 HV1386  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1386  COUNTRY     -  US
 HV1386  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1386
 HV1386                         *CURRENT SURVEY CONTROL
 HV1386  ______________________________________________________________________
 HV1386* NAD 83(1986) POSITION- 38 52 29.     (N) 076 59 55.     (W)   SCALED
 HV1386* NAVD 88 ORTHO HEIGHT -     2.73  (+/-2cm)        9.0   (feet) VERTCON3
 HV1386  ______________________________________________________________________
 HV1386  GEOID HEIGHT    -        -32.175 (meters)                     GEOID18
 HV1386  VERT ORDER      -  ? (See Below)
 HV1386
 HV1386.The horizontal coordinates were scaled from a map and have
 HV1386.an estimated accuracy of +/- 6 seconds.
 HV1386
 HV1386.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1386.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1386
 HV1386.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1386.GEOID18 height accuracy estimate available here.
 HV1386
 HV1386.The vertical order pertains to the NGVD 29 superseded value.
 HV1386
 HV1386.Click photographs - Photos may exist for this station.
 HV1386
 HV1386
 HV1386_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ266047(NAD 83)
 HV1386
 HV1386                          SUPERSEDED SURVEY CONTROL
 HV1386
 HV1386  NGVD 29 (11/26/84)    2.969  (m)            9.74   (f) ADJUSTED       
 HV1386
 HV1386.Superseded values are not recommended for survey control.
 HV1386
 HV1386.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1386.See file dsdata.pdf to determine how the superseded data were derived.
 HV1386
 HV1386_MARKER: DD = SURVEY DISK
 HV1386_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1386_SP_SET: RAILROAD DOORWAY
 HV1386_STAMPING: NO 197 N 1940
 HV1386_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1386
 HV1386  HISTORY     - Date     Condition        Report By
 HV1386  HISTORY     - 1940     MONUMENTED       USACE
 HV1386  HISTORY     - 1942     GOOD             CGS
 HV1386  HISTORY     - 1955     GOOD             CGS
 HV1386  HISTORY     - 19950810 MARK NOT FOUND   USPSQD
 HV1386
 HV1386                          STATION DESCRIPTION
 HV1386
 HV1386'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1386'IN WASHINGTON.
 HV1386'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1386'ON TINGEY STREET, AT THE NORTH END OF BUILDING 197, IN THE EAST
 HV1386'RAILROAD DOORWAY, AND BETWEEN THE RAILS OF THE TRACK.  A
 HV1386'WASHINGTON NAVY YARD STANDARD DISK, STAMPED NO 197 N 1940.
 HV1386
 HV1386                          STATION RECOVERY (1955)
 HV1386
 HV1386'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1386'RECOVERED IN GOOD CONDITION.
 HV1386
 HV1386                          STATION RECOVERY (1995)
 HV1386
 HV1386'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1386'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1395 ***********************************************************************
 HV1395  DESIGNATION -  197 WNY
 HV1395  PID         -  HV1395
 HV1395  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1395  COUNTRY     -  US
 HV1395  USGS QUAD   -  ANACOSTIA (2016)
 HV1395
 HV1395                         *CURRENT SURVEY CONTROL
 HV1395  ______________________________________________________________________
 HV1395* NAD 83(1986) POSITION- 38 52 24.     (N) 076 59 56.     (W)   SCALED
 HV1395* NAVD 88 ORTHO HEIGHT -     2.08  (+/-2cm)        6.8   (feet) VERTCON3
 HV1395  ______________________________________________________________________
 HV1395  GEOID HEIGHT    -        -32.177 (meters)                     GEOID18
 HV1395  VERT ORDER      -  ? (See Below)
 HV1395
 HV1395.The horizontal coordinates were scaled from a map and have
 HV1395.an estimated accuracy of +/- 6 seconds.
 HV1395
 HV1395.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1395.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1395
 HV1395.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1395.GEOID18 height accuracy estimate available here.
 HV1395
 HV1395.The vertical order pertains to the NGVD 29 superseded value.
 HV1395
 HV1395.Click photographs - Photos may exist for this station.
 HV1395
 HV1395
 HV1395_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ265046(NAD 83)
 HV1395
 HV1395                          SUPERSEDED SURVEY CONTROL
 HV1395
 HV1395  NGVD 29 (11/26/84)    2.328  (m)            7.64   (f) ADJUSTED       
 HV1395
 HV1395.Superseded values are not recommended for survey control.
 HV1395
 HV1395.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1395.See file dsdata.pdf to determine how the superseded data were derived.
 HV1395
 HV1395_MARKER: DD = SURVEY DISK
 HV1395_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1395_SP_SET: DOORWAY
 HV1395_STAMPING: NO 197 1940
 HV1395_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1395
 HV1395  HISTORY     - Date     Condition        Report By
 HV1395  HISTORY     - 1940     MONUMENTED       USACE
 HV1395  HISTORY     - 1942     GOOD             CGS
 HV1395  HISTORY     - 1955     GOOD             CGS
 HV1395  HISTORY     - 19950810 GOOD             USPSQD
 HV1395
 HV1395                          STATION DESCRIPTION
 HV1395
 HV1395'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1395'IN WASHINGTON.
 HV1395'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1395'AT THE SOUTH END OF BUILDING 197, AND IN THE CENTER OF THE
 HV1395'DOORWAY BETWEEN THE RAILS OF THE TRACK.  A WASHINGTON NAVY YARD
 HV1395'STANDARD DISK, STAMPED NO 197 1940.
 HV1395
 HV1395                          STATION RECOVERY (1955)
 HV1395
 HV1395'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1395'RECOVERED IN GOOD CONDITION.
 HV1395
 HV1395                          STATION RECOVERY (1995)
 HV1395
 HV1395'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1395'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1397 ***********************************************************************
 HV1397  TIDAL BM    -  This is a Tidal Bench Mark.
 HV1397  DESIGNATION -  2 WNY
 HV1397  PID         -  HV1397
 HV1397  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1397  COUNTRY     -  US
 HV1397  USGS QUAD   -  ANACOSTIA (2016)
 HV1397
 HV1397                         *CURRENT SURVEY CONTROL
 HV1397  ______________________________________________________________________
 HV1397* NAD 83(1986) POSITION- 38 52 22.     (N) 076 59 51.     (W)   SCALED
 HV1397* NAVD 88 ORTHO HEIGHT -     1.860 (meters)        6.10  (feet) ADJUSTED
 HV1397  ______________________________________________________________________
 HV1397  GEOID HEIGHT    -        -32.180 (meters)                     GEOID18
 HV1397  DYNAMIC HEIGHT  -          1.859 (meters)        6.10  (feet) COMP
 HV1397  MODELED GRAVITY -    980,096.2   (mgal)                       NAVD 88
 HV1397
 HV1397  VERT ORDER      -  FIRST     CLASS II
 HV1397
 HV1397.The horizontal coordinates were scaled from a map and have
 HV1397.an estimated accuracy of +/- 6 seconds.
 HV1397
 HV1397.The orthometric height was determined by differential leveling and
 HV1397.adjusted by the NATIONAL GEODETIC SURVEY
 HV1397.in June 1991.
 HV1397
 HV1397.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1397.GEOID18 height accuracy estimate available here.
 HV1397
 HV1397.This Tidal Bench Mark is designated as VM 12743
 HV1397.by the CENTER FOR OPERATIONAL OCEANOGRAPHIC PRODUCTS AND SERVICES.
 HV1397
 HV1397.Click photographs - Photos may exist for this station.
 HV1397
 HV1397.The dynamic height is computed by dividing the NAVD 88
 HV1397.geopotential number by the normal gravity value computed on the
 HV1397.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1397.degrees latitude (g = 980.6199 gals.).
 HV1397
 HV1397.The modeled gravity was interpolated from observed gravity values.
 HV1397
 HV1397
 HV1397_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ267045(NAD 83)
 HV1397
 HV1397                          SUPERSEDED SURVEY CONTROL
 HV1397
 HV1397  NGVD 29 (11/26/84)    2.101  (m)            6.89   (f) ADJUSTED    1 2
 HV1397
 HV1397.Superseded values are not recommended for survey control.
 HV1397
 HV1397.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1397.See file dsdata.pdf to determine how the superseded data were derived.
 HV1397
 HV1397_MARKER: DD = SURVEY DISK
 HV1397_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1397_SP_SET: BUILDING
 HV1397_STAMPING: NO 2 1940
 HV1397_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1397
 HV1397  HISTORY     - Date     Condition        Report By
 HV1397  HISTORY     - 1940     MONUMENTED       USACE
 HV1397  HISTORY     - 1942     GOOD             CGS
 HV1397  HISTORY     - 1955     GOOD             CGS
 HV1397  HISTORY     - 19950810 GOOD             USPSQD
 HV1397
 HV1397                          STATION DESCRIPTION
 HV1397
 HV1397'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1397'IN WASHINGTON.
 HV1397'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1397'AT THE NORTHWEST CORNER OF THE INTERSECTION OF PATTERSON AVENUE
 HV1397'AND SICARD STREET, ON THE SOUTH SIDE OF BUILDING 142, AT THE
 HV1397'EAST DOOR, 0.8 FOOT SOUTH OF THE DOOR, AND 0.2 FOOT FROM THE WEST
 HV1397'EDGE OF THE DOORWAY.  A WASHINGTON NAVY YARD STANDARD DISK,
 HV1397'STAMPED NO 2 1940.
 HV1397
 HV1397                          STATION RECOVERY (1955)
 HV1397
 HV1397'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1397'RECOVERED IN GOOD CONDITION.
 HV1397
 HV1397                          STATION RECOVERY (1995)
 HV1397
 HV1397'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1397'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9945 ***********************************************************************
 HV9945  DESIGNATION -  20439
 HV9945  PID         -  HV9945
 HV9945  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9945  COUNTRY     -  US
 HV9945  USGS QUAD   -  WASHINGTON EAST (2016)
 HV9945
 HV9945                         *CURRENT SURVEY CONTROL
 HV9945  ______________________________________________________________________
 HV9945* NAD 83(2011) POSITION- 38 57 09.07485(N) 076 59 08.61889(W)   ADJUSTED
 HV9945* NAD 83(2011) ELLIP HT-    -5.068 (meters)        (06/27/12)   ADJUSTED
 HV9945* NAD 83(2011) EPOCH   -  2010.00
 HV9945* NAVD 88 ORTHO HEIGHT -    27.0   (meters)       89.    (feet) GPS OBS
 HV9945  ______________________________________________________________________
 HV9945  NAVD 88 orthometric height was determined with geoid model    GEOID93
 HV9945  GEOID HEIGHT    -        -32.430 (meters)                     GEOID93
 HV9945  GEOID HEIGHT    -        -32.062 (meters)                     GEOID18
 HV9945  NAD 83(2011) X  -  1,118,456.091 (meters)                     COMP
 HV9945  NAD 83(2011) Y  - -4,839,065.698 (meters)                     COMP
 HV9945  NAD 83(2011) Z  -  3,988,216.200 (meters)                     COMP
 HV9945  LAPLACE CORR    -         -3.68  (seconds)                    DEFLEC18
 HV9945
 HV9945  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV9945  Standards:
 HV9945         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV9945            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV9945  -------------------------------------------------------------------
 HV9945  NETWORK    1.22   2.69           0.50   0.50   1.37     -0.11523477
 HV9945  -------------------------------------------------------------------
 HV9945  Click here for local accuracies and other accuracy information.
 HV9945
 HV9945.The horizontal coordinates were established by GPS observations
 HV9945.and adjusted by the National Geodetic Survey in June 2012.
 HV9945
 HV9945.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV9945.been affixed to the stable North American tectonic plate. See 
 HV9945.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV9945
 HV9945.The horizontal coordinates are valid at the epoch date displayed above
 HV9945.which is a decimal equivalence of Year/Month/Day.
 HV9945
 HV9945.The orthometric height was determined by GPS observations and a
 HV9945.high-resolution geoid model.
 HV9945
 HV9945.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9945.GEOID18 height accuracy estimate available here.
 HV9945
 HV9945.Click photographs - Photos may exist for this station.
 HV9945
 HV9945.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV9945
 HV9945.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9945
 HV9945.The ellipsoidal height was determined by GPS observations
 HV9945.and is referenced to NAD 83.
 HV9945
 HV9945. The following values were computed from the NAD 83(2011) position.
 HV9945
 HV9945;                    North         East     Units Scale Factor Converg.
 HV9945;SPC MD       -   142,735.655   401,237.143   MT  0.99995074   +0 00 32.2
 HV9945;SPC MD       -   468,291.89  1,316,392.19   sFT  0.99995074   +0 00 32.2
 HV9945;SPC VA N     - 2,143,813.011 3,631,253.118   MT  0.99996544   +0 56 42.3
 HV9945;SPC VA N     - 7,033,493.19 11,913,536.27   sFT  0.99996544   +0 56 42.3
 HV9945;UTM  18      - 4,313,382.761   327,930.222   MT  0.99996459   -1 14 55.3
 HV9945
 HV9945!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9945!SPC MD       -   1.00000080  x   0.99995074  =   0.99995154
 HV9945!SPC VA N     -   1.00000080  x   0.99996544  =   0.99996624
 HV9945!UTM  18      -   1.00000080  x   0.99996459  =   0.99996539
 HV9945
 HV9945_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2793013382(NAD 83)
 HV9945
 HV9945                          SUPERSEDED SURVEY CONTROL
 HV9945
 HV9945  NAD 83(2007)-  38 57 09.07520(N)    076 59 08.61972(W) AD(2002.00) 0
 HV9945  ELLIP H (02/10/07)   -5.042  (m)                       GP(2002.00)    
 HV9945  ELLIP H (08/30/02)   -5.040  (m)                       GP(       ) 4 2
 HV9945  ELLIP H (09/09/94)   -5.105  (m)                       GP(       ) 4 1
 HV9945  NAD 83(1991)-  38 57 09.07528(N)    076 59 08.62004(W) AD(       ) 1
 HV9945
 HV9945.Superseded values are not recommended for survey control.
 HV9945
 HV9945.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9945.See file dsdata.pdf to determine how the superseded data were derived.
 HV9945
 HV9945_MARKER: DD = SURVEY DISK
 HV9945_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV9945_STAMPING: T.S. 20439 PG
 HV9945_MARK LOGO: WSSC
 HV9945_MAGNETIC: R = STEEL ROD IMBEDDED IN MONUMENT
 HV9945_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV9945+STABILITY: SURFACE MOTION
 HV9945_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV9945+SATELLITE: SATELLITE OBSERVATIONS - May 06, 2008
 HV9945
 HV9945  HISTORY     - Date     Condition        Report By
 HV9945  HISTORY     - 1993     MONUMENTED       MSI
 HV9945  HISTORY     - 20040318 GOOD             GEOCAC
 HV9945  HISTORY     - 20080506 GOOD             NGS
 HV9945
 HV9945                          STATION DESCRIPTION
 HV9945
 HV9945'DESCRIBED BY MEASUREMENT SCIENCE INCORPORATED 1993
 HV9945'THE STATION IS LOCATED IN PRINCE GEORGES COUNTY, MARYLAND,
 HV9945'APPROXIMATELY 2.1 MI (3.4 KM) SOUTH OF THE TOWN OF TAKOMA PARK.  TO
 HV9945'REACH THE STATION FROM THE INTERSECTION OF RIGGS ROAD (S.R.  212) AND
 HV9945'SARGENT ROAD (S.R. 211), PROCEED SOUTH ALONG SARGENT ROAD FOR 1.1 MI
 HV9945'(1.8 KM) TO THE FIRST INTERSECTION WITH GALLOWAY STREET.  TURN LEFT
 HV9945'AND TRAVEL SOUTHEAST ALONG GALLOWAY STREET FOR 0.15 MI (0.24 KM) TO
 HV9945'THE STATION ON THE LEFT.
 HV9945'THE STATION IS A WSSC SURVEY DISK SET IN THE TOP OF A CONCRETE
 HV9945'MONUMENT, APPROXIMATELY FLUSH WITH THE GROUND SURFACE, AND STAMPED
 HV9945'T.S. 20439 PG.  THE DISK IS LOCATED 9.0 FT (2.7 M) SOUTHEAST OF A
 HV9945'MANHOLE, 64.0 FT (19.5 M) WEST OF A FIRE HYDRANT AND 11.8 FT (3.6 M)
 HV9945'SOUTH-SOUTHWEST OF THE CURB.
 HV9945
 HV9945                          STATION RECOVERY (2004)
 HV9945
 HV9945'RECOVERY NOTE BY GEOCACHING 2004 (APC)
 HV9945'LOCATED IN GRASSY AREA ACROSS EASTERN AVENUE FROM THE ARCHDIOCESE OF
 HV9945'WASHINGTON PASTORAL CENTER AT 5001 EASTERN AVENUE.
 HV9945
 HV9945                          STATION RECOVERY (2008)
 HV9945
 HV9945'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DRD)
 HV9945'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9960 ***********************************************************************
 HV9960  DESIGNATION -  20458
 HV9960  PID         -  HV9960
 HV9960  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9960  COUNTRY     -  US
 HV9960  USGS QUAD   -  ALEXANDRIA (2019)
 HV9960
 HV9960                         *CURRENT SURVEY CONTROL
 HV9960  ______________________________________________________________________
 HV9960* NAD 83(2011) POSITION- 38 49 06.85222(N) 077 00 50.05339(W)   ADJUSTED
 HV9960* NAD 83(2011) ELLIP HT-   -14.744 (meters)        (06/27/12)   ADJUSTED
 HV9960* NAD 83(2011) EPOCH   -  2010.00
 HV9960* NAVD 88 ORTHO HEIGHT -    17.5   (meters)       57.    (feet) GPS OBS
 HV9960  ______________________________________________________________________
 HV9960  NAVD 88 orthometric height was determined with geoid model    GEOID93
 HV9960  GEOID HEIGHT    -        -32.610 (meters)                     GEOID93
 HV9960  GEOID HEIGHT    -        -32.242 (meters)                     GEOID18
 HV9960  NAD 83(2011) X  -  1,118,172.290 (meters)                     COMP
 HV9960  NAD 83(2011) Y  - -4,848,704.117 (meters)                     COMP
 HV9960  NAD 83(2011) Z  -  3,976,635.072 (meters)                     COMP
 HV9960  LAPLACE CORR    -         -3.07  (seconds)                    DEFLEC18
 HV9960
 HV9960  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV9960  Standards:
 HV9960         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV9960            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV9960  -------------------------------------------------------------------
 HV9960  NETWORK    0.85   1.74           0.39   0.29   0.89     -0.02984695
 HV9960  -------------------------------------------------------------------
 HV9960  Click here for local accuracies and other accuracy information.
 HV9960
 HV9960.The horizontal coordinates were established by GPS observations
 HV9960.and adjusted by the National Geodetic Survey in June 2012.
 HV9960
 HV9960.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV9960.been affixed to the stable North American tectonic plate. See 
 HV9960.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV9960
 HV9960.The horizontal coordinates are valid at the epoch date displayed above
 HV9960.which is a decimal equivalence of Year/Month/Day.
 HV9960
 HV9960.The orthometric height was determined by GPS observations and a
 HV9960.high-resolution geoid model.
 HV9960
 HV9960.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9960.GEOID18 height accuracy estimate available here.
 HV9960
 HV9960.Click photographs - Photos may exist for this station.
 HV9960
 HV9960.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV9960
 HV9960.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9960
 HV9960.The ellipsoidal height was determined by GPS observations
 HV9960.and is referenced to NAD 83.
 HV9960
 HV9960. The following values were computed from the NAD 83(2011) position.
 HV9960
 HV9960;                    North         East     Units Scale Factor Converg.
 HV9960;SPC MD       -   127,866.080   398,792.561   MT  0.99995034   -0 00 31.4
 HV9960;SPC MD       -   419,507.30  1,308,371.93   sFT  0.99995034   -0 00 31.4
 HV9960;SPC VA N     - 2,128,905.339 3,629,051.790   MT  0.99995453   +0 55 39.0
 HV9960;SPC VA N     - 6,984,583.60 11,906,314.08   sFT  0.99995453   +0 55 39.0
 HV9960;UTM  18      - 4,298,570.032   325,160.277   MT  0.99997644   -1 15 45.9
 HV9960
 HV9960!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9960!SPC MD       -   1.00000231  x   0.99995034  =   0.99995265
 HV9960!SPC VA N     -   1.00000231  x   0.99995453  =   0.99995684
 HV9960!UTM  18      -   1.00000231  x   0.99997644  =   0.99997875
 HV9960
 HV9960_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2516098570(NAD 83)
 HV9960
 HV9960                          SUPERSEDED SURVEY CONTROL
 HV9960
 HV9960  NAD 83(2007)-  38 49 06.85292(N)    077 00 50.05421(W) AD(2002.00) 0
 HV9960  ELLIP H (02/10/07)  -14.736  (m)                       GP(2002.00)    
 HV9960  ELLIP H (08/30/02)  -14.721  (m)                       GP(       ) 4 2
 HV9960  ELLIP H (09/09/94)  -14.709  (m)                       GP(       ) 4 1
 HV9960  NAD 83(1991)-  38 49 06.85299(N)    077 00 50.05463(W) AD(       ) 1
 HV9960
 HV9960.Superseded values are not recommended for survey control.
 HV9960
 HV9960.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9960.See file dsdata.pdf to determine how the superseded data were derived.
 HV9960
 HV9960_MARKER: DD = SURVEY DISK
 HV9960_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV9960_STAMPING: T.S. 20458 PG
 HV9960_MARK LOGO: WSSC
 HV9960_MAGNETIC: R = STEEL ROD IMBEDDED IN MONUMENT
 HV9960_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV9960+STABILITY: SURFACE MOTION
 HV9960_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV9960+SATELLITE: SATELLITE OBSERVATIONS - 1993
 HV9960
 HV9960  HISTORY     - Date     Condition        Report By
 HV9960  HISTORY     - 1993     MONUMENTED       MSI
 HV9960
 HV9960                          STATION DESCRIPTION
 HV9960
 HV9960'DESCRIBED BY MEASUREMENT SCIENCE INCORPORATED 1993
 HV9960'THE STATION IS LOCATED IN THE DISTRICT OF COLUMBIA,
 HV9960'APPROXIMATELY 0.9 MI (1.4 KM) WEST OF THE TOWN OF FOREST HEIGHTS.  TO
 HV9960'REACH THE STATION FROM THE INTERSECTION OF MARTIN LUTHER KING JR
 HV9960'AVENUE AND SOUTH CAPITAL STREET, PROCEED SOUTHWEST ALONG MARTIN
 HV9960'LUTHER KING JR AVENUE FOR 0.9 MI (1.4 KM) TO THE INTERSECTION WITH
 HV9960'BLUE PLAINS DRIVE.  TURN RIGHT AND TRAVEL SOUTHWEST ALONG BLUE PLAINS
 HV9960'DRIVE FOR 0.3 MI (0.5 KM) TO THE FIRST ENTRANCE TO A PARKING LOT AND
 HV9960'THE STATION ON THE LEFT.
 HV9960'THE STATION IS A WSSC SURVEY DISK SET IN THE TOP OF A CONCRETE
 HV9960'MONUMENT, APPROXIMATELY FLUSH WITH THE GROUND SURFACE, AND STAMPED
 HV9960'T.S. 20458 PG.  THE DISK IS LOCATED 24.8 FT (7.6 M) EAST OF THE
 HV9960'CENTERLINE OF BLUE PLAINS DRIVE, 7.9 FT (2.4 M) WEST OF THE NORTHEAST
 HV9960'CORNER OF THE PARKING LOT, AND 19.4 FT (5.9 M) NORTH OF A METAL POST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AD9239 ***********************************************************************
 AD9239  DESIGNATION -  20725
 AD9239  PID         -  AD9239
 AD9239  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AD9239  COUNTRY     -  US
 AD9239  USGS QUAD   -  WASHINGTON WEST (2016)
 AD9239
 AD9239                         *CURRENT SURVEY CONTROL
 AD9239  ______________________________________________________________________
 AD9239* NAD 83(2011) POSITION- 38 58 05.78786(N) 077 00 26.65616(W)   ADJUSTED
 AD9239* NAD 83(2011) ELLIP HT-    26.661 (meters)        (06/27/12)   ADJUSTED
 AD9239* NAD 83(2011) EPOCH   -  2010.00
 AD9239* NAVD 88 ORTHO HEIGHT -    58.7   (meters)      193.    (feet) GPS OBS
 AD9239  ______________________________________________________________________
 AD9239  NAVD 88 orthometric height was determined with geoid model    GEOID96
 AD9239  GEOID HEIGHT    -        -32.006 (meters)                     GEOID96
 AD9239  GEOID HEIGHT    -        -32.017 (meters)                     GEOID18
 AD9239  NAD 83(2011) X  -  1,116,383.534 (meters)                     COMP
 AD9239  NAD 83(2011) Y  - -4,838,441.026 (meters)                     COMP
 AD9239  NAD 83(2011) Z  -  3,989,596.050 (meters)                     COMP
 AD9239  LAPLACE CORR    -         -2.85  (seconds)                    DEFLEC18
 AD9239
 AD9239  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AD9239  Standards:
 AD9239         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AD9239            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AD9239  -------------------------------------------------------------------
 AD9239  NETWORK    1.52   2.14           0.68   0.55   1.09      0.02308594
 AD9239  -------------------------------------------------------------------
 AD9239  Click here for local accuracies and other accuracy information.
 AD9239
 AD9239.The horizontal coordinates were established by GPS observations
 AD9239.and adjusted by the National Geodetic Survey in June 2012.
 AD9239
 AD9239.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AD9239.been affixed to the stable North American tectonic plate. See 
 AD9239.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AD9239
 AD9239.The horizontal coordinates are valid at the epoch date displayed above
 AD9239.which is a decimal equivalence of Year/Month/Day.
 AD9239
 AD9239.The orthometric height was determined by GPS observations and a
 AD9239.high-resolution geoid model.
 AD9239
 AD9239.Significant digits in the geoid height do not necessarily reflect accuracy.
 AD9239.GEOID18 height accuracy estimate available here.
 AD9239
 AD9239.Click photographs - Photos may exist for this station.
 AD9239
 AD9239.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AD9239
 AD9239.The Laplace correction was computed from DEFLEC18 derived deflections.
 AD9239
 AD9239.The ellipsoidal height was determined by GPS observations
 AD9239.and is referenced to NAD 83.
 AD9239
 AD9239. The following values were computed from the NAD 83(2011) position.
 AD9239
 AD9239;                    North         East     Units Scale Factor Converg.
 AD9239;UTM  18      - 4,315,172.342   326,090.209   MT  0.99997243   -1 15 45.9
 AD9239
 AD9239!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AD9239!UTM  18      -   0.99999582  x   0.99997243  =   0.99996825
 AD9239
 AD9239_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2609015172(NAD 83)
 AD9239
 AD9239                          SUPERSEDED SURVEY CONTROL
 AD9239
 AD9239  NAD 83(2007)-  38 58 05.78785(N)    077 00 26.65713(W) AD(2002.00) 0
 AD9239  ELLIP H (02/10/07)   26.709  (m)                       GP(2002.00)    
 AD9239  ELLIP H (08/30/02)   26.714  (m)                       GP(       ) 4 2
 AD9239  NAD 83(1991)-  38 58 05.78764(N)    077 00 26.65728(W) AD(       ) 1
 AD9239  ELLIP H (07/06/97)   26.639  (m)                       GP(       ) 3 1
 AD9239
 AD9239.Superseded values are not recommended for survey control.
 AD9239
 AD9239.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AD9239.See file dsdata.pdf to determine how the superseded data were derived.
 AD9239
 AD9239_MARKER: DD = SURVEY DISK
 AD9239_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 AD9239_STAMPING: 20725
 AD9239_MARK LOGO: WSSC
 AD9239_PROJECTION: FLUSH
 AD9239_MAGNETIC: R = STEEL ROD IMBEDDED IN MONUMENT
 AD9239_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AD9239+STABILITY: SURFACE MOTION
 AD9239_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AD9239+SATELLITE: SATELLITE OBSERVATIONS - May 06, 2008
 AD9239
 AD9239  HISTORY     - Date     Condition        Report By
 AD9239  HISTORY     - 1995     MONUMENTED       MSI
 AD9239  HISTORY     - 20080506 GOOD             NGS
 AD9239  HISTORY     - 20130104 GOOD             GEOCAC
 AD9239
 AD9239                          STATION DESCRIPTION
 AD9239
 AD9239'DESCRIBED BY MEASUREMENT SCIENCE INCORPORATED 1995 (JC)
 AD9239'STATION IS LOCATED WITHIN THE DISTRICT OF COLUMBIA IN TAKOMA PARK. TO
 AD9239'REACH THE STATION FROM THE INTERSECTION OF I-495 AND MD 650 (NEW
 AD9239'HAMPSHIRE AVE.), PROCEED SW ON MD 650 FOR 4.0 MI (6.4 KM) TO EASTERN
 AD9239'AVE. TURN RIGHT, AND PROCEED NW ON EASTERN AVE. FOR 0.2 MI (0.3 KM) TO
 AD9239'THE INTERSECTION WITH KANSAS AVE.  TURN LEFT ON KANSAS AVE, AND
 AD9239'PROCEED SOUTH FOR 0.05 MI (0.08 KM) TO THE INTERSECTION WITH UNDERWOOD
 AD9239'PLACE.  TURN RIGHT AND PROCEED NW ON UNDERWOOD PLACE FOR APPROXIMATELY
 AD9239'200 FEET (61.0 M) TO THE INTERSECTION WITH UNDERWOOD STREET AND THE
 AD9239'STATION. THE STATION IS LOCATED 13 FEET (4.0 M) SW OF FENCE CORNER,
 AD9239'3.3 FEET (1.0 M) NORTH OF THE BACK OF A CURB, AND 55 FEET (16.8 M) WSW
 AD9239'OF GAS METER (IN UNDERWOOD PLACE)
 AD9239
 AD9239                          STATION RECOVERY (2008)
 AD9239
 AD9239'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DRD)
 AD9239'RECOVERED IN GOOD CONDITION.
 AD9239
 AD9239                          STATION RECOVERY (2013)
 AD9239
 AD9239'RECOVERY NOTE BY GEOCACHING 2013 (APC)
 AD9239'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1404 ***********************************************************************
 HV1404  DESIGNATION -  211 RESET
 HV1404  PID         -  HV1404
 HV1404  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1404  COUNTRY     -  US
 HV1404  USGS QUAD   -  ANACOSTIA (2016)
 HV1404
 HV1404                         *CURRENT SURVEY CONTROL
 HV1404  ______________________________________________________________________
 HV1404* NAD 83(1986) POSITION- 38 52 18.     (N) 076 59 35.     (W)   SCALED
 HV1404* NAVD 88 ORTHO HEIGHT -     3.93  (+/-2cm)       12.9   (feet) VERTCON3
 HV1404  ______________________________________________________________________
 HV1404  GEOID HEIGHT    -        -32.189 (meters)                     GEOID18
 HV1404  VERT ORDER      -  ? (See Below)
 HV1404
 HV1404.The horizontal coordinates were scaled from a map and have
 HV1404.an estimated accuracy of +/- 6 seconds.
 HV1404
 HV1404.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1404.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1404
 HV1404.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1404.GEOID18 height accuracy estimate available here.
 HV1404
 HV1404.The vertical order pertains to the NGVD 29 superseded value.
 HV1404
 HV1404.Click photographs - Photos may exist for this station.
 HV1404
 HV1404
 HV1404_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ270044(NAD 83)
 HV1404
 HV1404                          SUPERSEDED SURVEY CONTROL
 HV1404
 HV1404  NGVD 29 (11/26/84)    4.173  (m)           13.69   (f) ADJUSTED       
 HV1404
 HV1404.Superseded values are not recommended for survey control.
 HV1404
 HV1404.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1404.See file dsdata.pdf to determine how the superseded data were derived.
 HV1404
 HV1404_MARKER: DD = SURVEY DISK
 HV1404_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1404_SP_SET: LOADING PLATFORM
 HV1404_STAMPING: 211 RESET 1955
 HV1404_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1404
 HV1404  HISTORY     - Date     Condition        Report By
 HV1404  HISTORY     - 1955     MONUMENTED       USACE
 HV1404  HISTORY     - 19950811 GOOD             USPSQD
 HV1404
 HV1404                          STATION DESCRIPTION
 HV1404
 HV1404'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1955
 HV1404'IN WASHINGTON.
 HV1404'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN
 HV1404'FACTORY, NEAR THE SOUTH END OF TENTH STREET, AT THE NORTHEAST
 HV1404'CORNER OF BUILDING 211, ON THE CONCRETE LOADING PLATFORM, 1.3
 HV1404'FEET SOUTH OF THE NORTH END, AND 0.8 FOOT WEST OF THE EAST SIDE
 HV1404'OF THE PLATFORM.  A NAVAL GUN FACTORY STANDARD DISK, STAMPED
 HV1404'211 RESET 1955.
 HV1404
 HV1404                          STATION RECOVERY (1995)
 HV1404
 HV1404'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1404'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1389 ***********************************************************************
 HV1389  DESIGNATION -  213 WNY
 HV1389  PID         -  HV1389
 HV1389  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1389  COUNTRY     -  US
 HV1389  USGS QUAD   -  ALEXANDRIA (2019)
 HV1389
 HV1389                         *CURRENT SURVEY CONTROL
 HV1389  ______________________________________________________________________
 HV1389* NAD 83(1986) POSITION- 38 52 23.     (N) 077 00 11.     (W)   SCALED
 HV1389* NAVD 88 ORTHO HEIGHT -     5.61  (+/-2cm)       18.4   (feet) VERTCON3
 HV1389  ______________________________________________________________________
 HV1389  GEOID HEIGHT    -        -32.170 (meters)                     GEOID18
 HV1389  VERT ORDER      -  ? (See Below)
 HV1389
 HV1389.The horizontal coordinates were scaled from a map and have
 HV1389.an estimated accuracy of +/- 6 seconds.
 HV1389
 HV1389.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1389.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1389
 HV1389.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1389.GEOID18 height accuracy estimate available here.
 HV1389
 HV1389.The vertical order pertains to the NGVD 29 superseded value.
 HV1389
 HV1389.Click photographs - Photos may exist for this station.
 HV1389
 HV1389
 HV1389_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ262045(NAD 83)
 HV1389
 HV1389                          SUPERSEDED SURVEY CONTROL
 HV1389
 HV1389  NGVD 29 (11/26/84)    5.853  (m)           19.20   (f) ADJUSTED       
 HV1389
 HV1389.Superseded values are not recommended for survey control.
 HV1389
 HV1389.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1389.See file dsdata.pdf to determine how the superseded data were derived.
 HV1389
 HV1389_MARKER: DD = SURVEY DISK
 HV1389_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1389_SP_SET: BUILDING
 HV1389_STAMPING: NO 213 1940
 HV1389_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1389
 HV1389  HISTORY     - Date     Condition        Report By
 HV1389  HISTORY     - 1940     MONUMENTED       USN
 HV1389  HISTORY     - 1942     GOOD             CGS
 HV1389  HISTORY     - 1955     GOOD             CGS
 HV1389  HISTORY     - 19950811 MARK NOT FOUND   USPSQD
 HV1389
 HV1389                          STATION DESCRIPTION
 HV1389
 HV1389'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1389'IN WASHINGTON.
 HV1389'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1389'INSIDE THE SOUTH END OF BUILDING 213 A (COVERED CRANEWAY), AT
 HV1389'THE WEST WALL, AND NEAR THE TOP OF THE CONCRETE RAMP LEADING
 HV1389'TO THE LOADING PLATFORM.  A WASHINGTON NAVY YARD STANDARD DISK,
 HV1389'STAMPED NO 213 1940.
 HV1389
 HV1389                          STATION RECOVERY (1955)
 HV1389
 HV1389'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1389'RECOVERED IN GOOD CONDITION.
 HV1389
 HV1389                          STATION RECOVERY (1995)
 HV1389
 HV1389'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1389'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1306 ***********************************************************************
 HV1306  DESIGNATION -  2203 WSSC
 HV1306  PID         -  HV1306
 HV1306  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1306  COUNTRY     -  US
 HV1306  USGS QUAD   -  ANACOSTIA (2016)
 HV1306
 HV1306                         *CURRENT SURVEY CONTROL
 HV1306  ______________________________________________________________________
 HV1306* NAD 83(1986) POSITION- 38 51 51.     (N) 076 58 32.     (W)   SCALED
 HV1306* NAVD 88 ORTHO HEIGHT -    34.43  (+/-2cm)      113.0   (feet) VERTCON3
 HV1306  ______________________________________________________________________
 HV1306  GEOID HEIGHT    -        -32.228 (meters)                     GEOID18
 HV1306  VERT ORDER      -  SECOND    CLASS 0 (See Below)
 HV1306
 HV1306.The horizontal coordinates were scaled from a map and have
 HV1306.an estimated accuracy of +/- 6 seconds.
 HV1306
 HV1306.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1306.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1306
 HV1306.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1306.GEOID18 height accuracy estimate available here.
 HV1306
 HV1306.The vertical order pertains to the NGVD 29 superseded value.
 HV1306
 HV1306.Click photographs - Photos may exist for this station.
 HV1306
 HV1306
 HV1306_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ285035(NAD 83)
 HV1306
 HV1306                          SUPERSEDED SURVEY CONTROL
 HV1306
 HV1306  NGVD 29 (11/26/84)   34.674  (m)          113.76   (f) ADJUSTED    2 0
 HV1306
 HV1306.Superseded values are not recommended for survey control.
 HV1306
 HV1306.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1306.See file dsdata.pdf to determine how the superseded data were derived.
 HV1306
 HV1306_MARKER: Q = CHISELED SQUARE
 HV1306_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1306_SP_SET: SIDEWALK
 HV1306_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1306
 HV1306  HISTORY     - Date     Condition        Report By
 HV1306  HISTORY     - 1944     MONUMENTED       WSSC
 HV1306
 HV1306                          STATION DESCRIPTION
 HV1306
 HV1306'DESCRIBED BY WASH SUBURB SAN COMM 1944
 HV1306'AT ANACOSTIA.
 HV1306'ON GOOD HOPE ROAD, AT THE GERMAN ORPHANAGE, AND ON THE WALK AND
 HV1306'CONCRETE DRIVE TO THE ORPHANAGE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1953 ***********************************************************************
 HV1953  DESIGNATION -  26 INCH EQ HOUSE
 HV1953  PID         -  HV1953
 HV1953  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1953  COUNTRY     -  US
 HV1953  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1953
 HV1953                         *CURRENT SURVEY CONTROL
 HV1953  ______________________________________________________________________
 HV1953* NAD 83(1986) POSITION- 38 55 17.     (N) 077 04 01.     (W)   SCALED
 HV1953* NAVD 88 ORTHO HEIGHT -    85.137 (meters)      279.32  (feet) ADJUSTED
 HV1953  ______________________________________________________________________
 HV1953  GEOID HEIGHT    -        -31.989 (meters)                     GEOID18
 HV1953  DYNAMIC HEIGHT  -         85.091 (meters)      279.17  (feet) COMP
 HV1953  MODELED GRAVITY -    980,088.7   (mgal)                       NAVD 88
 HV1953
 HV1953  VERT ORDER      -  SECOND    CLASS 0
 HV1953
 HV1953.The horizontal coordinates were scaled from a map and have
 HV1953.an estimated accuracy of +/- 6 seconds.
 HV1953
 HV1953.The orthometric height was determined by differential leveling and
 HV1953.adjusted by the NATIONAL GEODETIC SURVEY
 HV1953.in June 1991.
 HV1953
 HV1953.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1953.GEOID18 height accuracy estimate available here.
 HV1953
 HV1953.Click photographs - Photos may exist for this station.
 HV1953
 HV1953.The dynamic height is computed by dividing the NAVD 88
 HV1953.geopotential number by the normal gravity value computed on the
 HV1953.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1953.degrees latitude (g = 980.6199 gals.).
 HV1953
 HV1953.The modeled gravity was interpolated from observed gravity values.
 HV1953
 HV1953
 HV1953_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ208100(NAD 83)
 HV1953
 HV1953                          SUPERSEDED SURVEY CONTROL
 HV1953
 HV1953  NGVD 29 (11/26/84)   85.361  (m)          280.06   (f) ADJUSTED    2 0
 HV1953
 HV1953.Superseded values are not recommended for survey control.
 HV1953
 HV1953.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1953.See file dsdata.pdf to determine how the superseded data were derived.
 HV1953
 HV1953_MARKER: Q = CHISELED SQUARE
 HV1953_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1953_SP_SET: DOOR SILL
 HV1953_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1953
 HV1953  HISTORY     - Date     Condition        Report By
 HV1953  HISTORY     - UNK      MONUMENTED       CGS
 HV1953  HISTORY     - 1927     GOOD             CGS
 HV1953
 HV1953                          STATION DESCRIPTION
 HV1953
 HV1953'DESCRIBED BY COAST AND GEODETIC SURVEY 1927
 HV1953'AT WASHINGTON.
 HV1953'LOCATED IN THE CENTER OF THE EAST END OF DOOR SILL AT THE ENTRANCE
 HV1953'TO THE 26 IN EQUATORIAL HOUSE.  NOTE-- IN THE VICINITY OF THE
 HV1953'NAVAL OBSERVATORY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1975 ***********************************************************************
 HV1975  DESIGNATION -  27=US 1
 HV1975  PID         -  HV1975
 HV1975  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1975  COUNTRY     -  US
 HV1975  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1975
 HV1975                         *CURRENT SURVEY CONTROL
 HV1975  ______________________________________________________________________
 HV1975* NAD 83(1986) POSITION- 38 52 35.     (N) 077 00 50.     (W)   SCALED
 HV1975* NAVD 88 ORTHO HEIGHT -     3.112 (meters)       10.21  (feet) POSTED
 HV1975  ______________________________________________________________________
 HV1975  GEOID HEIGHT    -        -32.146 (meters)                     GEOID18
 HV1975  DYNAMIC HEIGHT  -          3.11  (meters)       10.2   (feet) COMP
 HV1975  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 HV1975
 HV1975  VERT ORDER      -  * POSTED, SEE BELOW
 HV1975
 HV1975.The horizontal coordinates were scaled from a map and have
 HV1975.an estimated accuracy of +/- 6 seconds.
 HV1975
 HV1975.The orthometric height was determined by differential leveling
 HV1975.and adjusted by the NATIONAL GEODETIC SURVEY in 1992.
 HV1975
 HV1975.* This is a POSTED BENCH MARK height.
 HV1975
 HV1975.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1975.GEOID18 height accuracy estimate available here.
 HV1975
 HV1975.Click photographs - Photos may exist for this station.
 HV1975
 HV1975.The dynamic height is computed by dividing the NAVD 88
 HV1975.geopotential number by the normal gravity value computed on the
 HV1975.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1975.degrees latitude (g = 980.6199 gals.).
 HV1975
 HV1975.The modeled gravity was interpolated from observed gravity values.
 HV1975
 HV1975
 HV1975_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ253049(NAD 83)
 HV1975
 HV1975                          SUPERSEDED SURVEY CONTROL
 HV1975
 HV1975  NGVD 29 (11/26/84)    3.348  (m)           10.98   (f) ADJUSTED    1 2
 HV1975
 HV1975.Superseded values are not recommended for survey control.
 HV1975
 HV1975.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1975.See file dsdata.pdf to determine how the superseded data were derived.
 HV1975
 HV1975_MARKER: Z = SEE DESCRIPTION
 HV1975_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1975_SP_SET: GRANITE BLOCK
 HV1975_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1975
 HV1975  HISTORY     - Date     Condition        Report By
 HV1975  HISTORY     - UNK      MONUMENTED       NONE
 HV1975  HISTORY     - 1923     GOOD             CGS
 HV1975  HISTORY     - 1941     MARK NOT FOUND   CGS
 HV1975
 HV1975                          STATION DESCRIPTION
 HV1975
 HV1975'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1975'AT WASHINGTON.
 HV1975'AT WASHINGTON, AT THE SOUTHEAST CORNER OF THE INTERSECTION OF
 HV1975'DELAWARE AVENUE AND M STREET SOUTHWEST, AND ON A 6-INCH SQUARE
 HV1975'GRANITE BLOCK MARKED U.S.  THE TOP OF THE BLOCK.
 HV1975
 HV1975                          STATION RECOVERY (1941)
 HV1975
 HV1975'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1941
 HV1975'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1976 ***********************************************************************
 HV1976  DESIGNATION -  28=US 2
 HV1976  PID         -  HV1976
 HV1976  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1976  COUNTRY     -  US
 HV1976  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1976
 HV1976                         *CURRENT SURVEY CONTROL
 HV1976  ______________________________________________________________________
 HV1976* NAD 83(1986) POSITION- 38 52 35.     (N) 077 00 50.     (W)   SCALED
 HV1976* NAVD 88 ORTHO HEIGHT -     3.065 (meters)       10.06  (feet) POSTED
 HV1976  ______________________________________________________________________
 HV1976  GEOID HEIGHT    -        -32.146 (meters)                     GEOID18
 HV1976  DYNAMIC HEIGHT  -          3.06  (meters)       10.0   (feet) COMP
 HV1976  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 HV1976
 HV1976  VERT ORDER      -  * POSTED, SEE BELOW
 HV1976
 HV1976.The horizontal coordinates were scaled from a map and have
 HV1976.an estimated accuracy of +/- 6 seconds.
 HV1976
 HV1976.The orthometric height was determined by differential leveling
 HV1976.and adjusted by the NATIONAL GEODETIC SURVEY in 1992.
 HV1976
 HV1976.* This is a POSTED BENCH MARK height.
 HV1976
 HV1976.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1976.GEOID18 height accuracy estimate available here.
 HV1976
 HV1976.Click photographs - Photos may exist for this station.
 HV1976
 HV1976.The dynamic height is computed by dividing the NAVD 88
 HV1976.geopotential number by the normal gravity value computed on the
 HV1976.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1976.degrees latitude (g = 980.6199 gals.).
 HV1976
 HV1976.The modeled gravity was interpolated from observed gravity values.
 HV1976
 HV1976
 HV1976_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ253049(NAD 83)
 HV1976
 HV1976                          SUPERSEDED SURVEY CONTROL
 HV1976
 HV1976  NGVD 29 (11/26/84)    3.301  (m)           10.83   (f) ADJUSTED    1 2
 HV1976
 HV1976.Superseded values are not recommended for survey control.
 HV1976
 HV1976.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1976.See file dsdata.pdf to determine how the superseded data were derived.
 HV1976
 HV1976_MARKER: Z = SEE DESCRIPTION
 HV1976_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1976_SP_SET: GRANITE BLOCK
 HV1976_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1976
 HV1976  HISTORY     - Date     Condition        Report By
 HV1976  HISTORY     - UNK      MONUMENTED       NONE
 HV1976  HISTORY     - 1923     GOOD             CGS
 HV1976  HISTORY     - 1941     MARK NOT FOUND   CGS
 HV1976
 HV1976                          STATION DESCRIPTION
 HV1976
 HV1976'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1976'AT WASHINGTON.
 HV1976'AT WASHINGTON, AT THE SOUTHWEST CORNER OF THE INTERSECTION OF
 HV1976'SECOND AND M STREETS SOUTHWEST, 21.2 FEET EAST OF BENCH MARK B.M.
 HV1976'27 DESCRIBED ABOVE, AND ON A 6-INCH SQUARE GRANITE BLOCK MARKED
 HV1976'U.S.  THE TOP OF THE BLOCK.  NOTE-- IT WAS REPORTED THAT M STREET
 HV1976'HAS RECENTLY BEEN PAVED WITH CONCRETE AND THE MARK MAY HAVE BEEN
 HV1976'DESTROYED.
 HV1976
 HV1976                          STATION RECOVERY (1941)
 HV1976
 HV1976'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1941
 HV1976'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1977 ***********************************************************************
 HV1977  DESIGNATION -  29
 HV1977  PID         -  HV1977
 HV1977  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1977  COUNTRY     -  US
 HV1977  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1977
 HV1977                         *CURRENT SURVEY CONTROL
 HV1977  ______________________________________________________________________
 HV1977* NAD 83(1986) POSITION- 38 52 35.     (N) 077 01 02.     (W)   SCALED
 HV1977* NAVD 88 ORTHO HEIGHT -     6.354 (meters)       20.85  (feet) POSTED
 HV1977  ______________________________________________________________________
 HV1977  GEOID HEIGHT    -        -32.141 (meters)                     GEOID18
 HV1977  DYNAMIC HEIGHT  -          6.35  (meters)       20.8   (feet) COMP
 HV1977  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 HV1977
 HV1977  VERT ORDER      -  * POSTED, SEE BELOW
 HV1977
 HV1977.The horizontal coordinates were scaled from a map and have
 HV1977.an estimated accuracy of +/- 6 seconds.
 HV1977
 HV1977.The orthometric height was determined by differential leveling
 HV1977.and adjusted by the NATIONAL GEODETIC SURVEY in 1992.
 HV1977
 HV1977.* This is a POSTED BENCH MARK height.
 HV1977
 HV1977.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1977.GEOID18 height accuracy estimate available here.
 HV1977
 HV1977.Click photographs - Photos may exist for this station.
 HV1977
 HV1977.The dynamic height is computed by dividing the NAVD 88
 HV1977.geopotential number by the normal gravity value computed on the
 HV1977.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1977.degrees latitude (g = 980.6199 gals.).
 HV1977
 HV1977.The modeled gravity was interpolated from observed gravity values.
 HV1977
 HV1977
 HV1977_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ250049(NAD 83)
 HV1977
 HV1977                          SUPERSEDED SURVEY CONTROL
 HV1977
 HV1977  NGVD 29 (11/26/84)    6.590  (m)           21.62   (f) ADJUSTED    1 2
 HV1977
 HV1977.Superseded values are not recommended for survey control.
 HV1977
 HV1977.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1977.See file dsdata.pdf to determine how the superseded data were derived.
 HV1977
 HV1977_MARKER: Z = SEE DESCRIPTION
 HV1977_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1977_SP_SET: DOORSILL
 HV1977_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1977
 HV1977  HISTORY     - Date     Condition        Report By
 HV1977  HISTORY     - UNK      MONUMENTED       NONE
 HV1977  HISTORY     - 1923     GOOD             CGS
 HV1977  HISTORY     - 1941     MARK NOT FOUND   CGS
 HV1977
 HV1977                          STATION DESCRIPTION
 HV1977
 HV1977'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1977'AT WASHINGTON.
 HV1977'AT WASHINGTON, AT THE SOUTHEAST CORNER OF THE INTERSECTION OF
 HV1977'FOURTH AND M STREETS SOUTHWEST, AT THE BUILDING AT 1200 FOURTH
 HV1977'STREET, AND ON THE DOORSILL.  THE SOUTH END OF THE DOORSILL.
 HV1977'NOTE-- IT WAS REPORTED THAT THERE ARE TWO DOORS NUMBERED
 HV1977'1200-- THE NORTH ONE AT THE M STREET CORNER IS AN ENTRANCE
 HV1977'TO A STORE, THE SOUTH ONE IS THE ENTRANCE TO THE APARTMENTS
 HV1977'OVER THE STORE.  THERE WAS NO MARK ON EITHER SILL.
 HV1977
 HV1977                          STATION RECOVERY (1941)
 HV1977
 HV1977'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1941
 HV1977'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1907 ***********************************************************************
 HV1907  DESIGNATION -  3
 HV1907  PID         -  HV1907
 HV1907  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1907  COUNTRY     -  US
 HV1907  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1907
 HV1907                         *CURRENT SURVEY CONTROL
 HV1907  ______________________________________________________________________
 HV1907* NAD 83(1986) POSITION- 38 56 32.     (N) 077 03 56.     (W)   SCALED
 HV1907* NAVD 88 ORTHO HEIGHT -   103.756 (meters)      340.41  (feet) ADJUSTED
 HV1907  ______________________________________________________________________
 HV1907  GEOID HEIGHT    -        -31.964 (meters)                     GEOID18
 HV1907  DYNAMIC HEIGHT  -        103.700 (meters)      340.22  (feet) COMP
 HV1907  MODELED GRAVITY -    980,083.0   (mgal)                       NAVD 88
 HV1907
 HV1907  VERT ORDER      -  SECOND    CLASS 0
 HV1907
 HV1907.The horizontal coordinates were scaled from a map and have
 HV1907.an estimated accuracy of +/- 6 seconds.
 HV1907
 HV1907.The orthometric height was determined by differential leveling and
 HV1907.adjusted by the NATIONAL GEODETIC SURVEY
 HV1907.in June 1991.
 HV1907
 HV1907.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1907.GEOID18 height accuracy estimate available here.
 HV1907
 HV1907.Click photographs - Photos may exist for this station.
 HV1907
 HV1907.The dynamic height is computed by dividing the NAVD 88
 HV1907.geopotential number by the normal gravity value computed on the
 HV1907.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1907.degrees latitude (g = 980.6199 gals.).
 HV1907
 HV1907.The modeled gravity was interpolated from observed gravity values.
 HV1907
 HV1907
 HV1907_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ209123(NAD 83)
 HV1907
 HV1907                          SUPERSEDED SURVEY CONTROL
 HV1907
 HV1907  NGVD 29 (11/26/84)  103.988  (m)          341.17   (f) ADJUSTED    2 0
 HV1907
 HV1907.Superseded values are not recommended for survey control.
 HV1907
 HV1907.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1907.See file dsdata.pdf to determine how the superseded data were derived.
 HV1907
 HV1907_MARKER: X = CHISELED CROSS
 HV1907_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1907_SP_SET: STEP
 HV1907_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1907
 HV1907  HISTORY     - Date     Condition        Report By
 HV1907  HISTORY     - UNK      MONUMENTED       CGS
 HV1907  HISTORY     - 1928     GOOD             CGS
 HV1907  HISTORY     - 1970     MARK NOT FOUND   NGS
 HV1907
 HV1907                          STATION DESCRIPTION
 HV1907
 HV1907'DESCRIBED BY COAST AND GEODETIC SURVEY 1928
 HV1907'IN WASHINGTON.
 HV1907'IN NORTHWEST WASHINGTON, AT THE NATIONAL BUREAU OF STANDARDS,
 HV1907'AT THE NORTH ENTRANCE TO THE WIND TUNNEL BUILDING, AND ON
 HV1907'THE WEST SIDE OF THE TOP STEP.  A CHISELED CROSS.
 HV1907
 HV1907                          STATION RECOVERY (1970)
 HV1907
 HV1907'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1970
 HV1907'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4502 ***********************************************************************
 HV4502  DESIGNATION -  3 C
 HV4502  PID         -  HV4502
 HV4502  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4502  COUNTRY     -  US
 HV4502  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4502
 HV4502                         *CURRENT SURVEY CONTROL
 HV4502  ______________________________________________________________________
 HV4502* NAD 83(1993) POSITION- 38 53 37.26086(N) 077 00 55.27510(W)   ADJUSTED
 HV4502* NAVD 88 ORTHO HEIGHT -     8.81  (+/-2cm)       28.9   (feet) VERTCON3
 HV4502  ______________________________________________________________________
 HV4502  GEOID HEIGHT    -        -32.109 (meters)                     GEOID18
 HV4502  LAPLACE CORR    -         -3.19  (seconds)                    DEFLEC18
 HV4502  HORZ ORDER      -  SECOND
 HV4502  VERT ORDER      -  THIRD ? (See Below)
 HV4502
 HV4502.The horizontal coordinates were established by classical geodetic methods
 HV4502.and adjusted by the National Geodetic Survey in November 1994.
 HV4502
 HV4502.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4502.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4502
 HV4502.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4502.GEOID18 height accuracy estimate available here.
 HV4502
 HV4502.The vertical order pertains to the NGVD 29 superseded value.
 HV4502
 HV4502.Click photographs - Photos may exist for this station.
 HV4502
 HV4502.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4502
 HV4502. The following values were computed from the NAD 83(1993) position.
 HV4502
 HV4502;                    North         East     Units Scale Factor Converg.
 HV4502;SPC MD       -   136,204.240   398,668.000   MT  0.99994990   -0 00 34.7
 HV4502;SPC MD       -   446,863.41  1,307,963.26   sFT  0.99994990   -0 00 34.7
 HV4502;SPC VA N     - 2,137,240.410 3,628,791.002   MT  0.99995997   +0 55 35.7
 HV4502;SPC VA N     - 7,011,929.58 11,905,458.48   sFT  0.99995997   +0 55 35.7
 HV4502;UTM  18      - 4,306,909.139   325,218.378   MT  0.99997618   -1 15 56.6
 HV4502
 HV4502!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4502!SPC MD       -   1.00000366  x   0.99994990  =   0.99995355
 HV4502!SPC VA N     -   1.00000366  x   0.99995997  =   0.99996362
 HV4502!UTM  18      -   1.00000366  x   0.99997618  =   0.99997984
 HV4502
 HV4502:                Primary Azimuth Mark                     Grid Az
 HV4502:SPC MD       -  3 C AZ MK                                192 53 41.5
 HV4502:SPC VA N     -  3 C AZ MK                                191 57 31.1
 HV4502:UTM  18      -  3 C AZ MK                                194 09 03.4
 HV4502
 HV4502_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2521806909(NAD 83)
 HV4502
 HV4502|---------------------------------------------------------------------|
 HV4502| PID    Reference Object                     Distance      Geod. Az  |
 HV4502|                                                           dddmmss.s |
 HV4502| HV4501 3 PEN                               233.645 METERS 17305     |
 HV4502| DC6617 3 C AZ MK                                          1925306.8 |
 HV4502| HV4504 6 C                                 382.050 METERS 27013     |
 HV4502|---------------------------------------------------------------------|
 HV4502
 HV4502                          SUPERSEDED SURVEY CONTROL
 HV4502
 HV4502  NAD 83(1991)-  38 53 37.25970(N)    077 00 55.27631(W) AD(       ) 2
 HV4502  NAD 83(1986)-  38 53 37.25916(N)    077 00 55.28703(W) AD(       ) 2
 HV4502  NAD 27      -  38 53 36.85886(N)    077 00 56.36884(W) AD(       ) 2
 HV4502  NGVD 29 (07/19/86)    9.05   (m)           29.7    (f) LEVELING    3  
 HV4502
 HV4502.Superseded values are not recommended for survey control.
 HV4502
 HV4502.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4502.See file dsdata.pdf to determine how the superseded data were derived.
 HV4502
 HV4502_MARKER: DD = SURVEY DISK
 HV4502_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV4502_SP_SET: SIDEWALK
 HV4502_MARK LOGO: CANDA
 HV4502_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4502
 HV4502  HISTORY     - Date     Condition        Report By
 HV4502  HISTORY     - 1981     MONUMENTED       CANDA
 HV4502
 HV4502                          STATION DESCRIPTION
 HV4502
 HV4502'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4502'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4502'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4502'
 HV4502'STATION IS LOCATED IN THE SIDEWALK ON THE NORTHWEST CORNER OF 3RD
 HV4502'STREET N.W. AND C STREET N.W.
 HV4502'
 HV4502'STATION IS 12.98 FT NW OF X ON RIM OF M.H. IN STREET.
 HV4502'
 HV4502'STATION IS 12.20 FT SW OF SIGNAL POST BASE ON 3RD ST.
 HV4502'
 HV4502'STATION IS 16.01 FT NE OF SIGNAL POST BASE ON C STREET.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4501 ***********************************************************************
 HV4501  DESIGNATION -  3 PEN
 HV4501  PID         -  HV4501
 HV4501  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4501  COUNTRY     -  US
 HV4501  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4501
 HV4501                         *CURRENT SURVEY CONTROL
 HV4501  ______________________________________________________________________
 HV4501* NAD 83(1993) POSITION- 38 53 29.73919(N) 077 00 54.10807(W)   ADJUSTED
 HV4501* NAVD 88 ORTHO HEIGHT -     2.93  (+/-2cm)        9.6   (feet) VERTCON3
 HV4501  ______________________________________________________________________
 HV4501  GEOID HEIGHT    -        -32.114 (meters)                     GEOID18
 HV4501  LAPLACE CORR    -         -3.17  (seconds)                    DEFLEC18
 HV4501  HORZ ORDER      -  SECOND
 HV4501  VERT ORDER      -  THIRD ? (See Below)
 HV4501
 HV4501.The horizontal coordinates were established by classical geodetic methods
 HV4501.and adjusted by the National Geodetic Survey in November 1994.
 HV4501
 HV4501.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4501.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4501
 HV4501.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4501.GEOID18 height accuracy estimate available here.
 HV4501
 HV4501.The vertical order pertains to the NGVD 29 superseded value.
 HV4501
 HV4501.Click photographs - Photos may exist for this station.
 HV4501
 HV4501.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4501
 HV4501. The following values were computed from the NAD 83(1993) position.
 HV4501
 HV4501;                    North         East     Units Scale Factor Converg.
 HV4501;SPC MD       -   135,972.300   398,696.084   MT  0.99994989   -0 00 34.0
 HV4501;SPC MD       -   446,102.45  1,308,055.40   sFT  0.99994989   -0 00 34.0
 HV4501;SPC VA N     - 2,137,008.958 3,628,822.873   MT  0.99995980   +0 55 36.5
 HV4501;SPC VA N     - 7,011,170.22 11,905,563.04   sFT  0.99995980   +0 55 36.5
 HV4501;UTM  18      - 4,306,676.634   325,241.372   MT  0.99997608   -1 15 55.6
 HV4501
 HV4501!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4501!SPC MD       -   1.00000458  x   0.99994989  =   0.99995447
 HV4501!SPC VA N     -   1.00000458  x   0.99995980  =   0.99996438
 HV4501!UTM  18      -   1.00000458  x   0.99997608  =   0.99998066
 HV4501
 HV4501:                Primary Azimuth Mark                     Grid Az
 HV4501:SPC MD       -  3 PEN AZ MK                              059 38 11.7
 HV4501:SPC VA N     -  3 PEN AZ MK                              058 42 01.2
 HV4501:UTM  18      -  3 PEN AZ MK                              060 53 33.3
 HV4501
 HV4501_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2524106676(NAD 83)
 HV4501
 HV4501|---------------------------------------------------------------------|
 HV4501| PID    Reference Object                     Distance      Geod. Az  |
 HV4501|                                                           dddmmss.s |
 HV4501| DC6621 3 PEN AZ MK                                        0593737.7 |
 HV4501| HV4500 1 LA                                249.469 METERS 06624     |
 HV4501| HV4508 6 CON                               452.978 METERS 2784515.0 |
 HV4501| HV4502 3 C                                 233.645 METERS 35305     |
 HV4501|---------------------------------------------------------------------|
 HV4501
 HV4501                          SUPERSEDED SURVEY CONTROL
 HV4501
 HV4501  NAD 83(1991)-  38 53 29.73803(N)    077 00 54.10928(W) AD(       ) 2
 HV4501  NAD 83(1986)-  38 53 29.73750(N)    077 00 54.12003(W) AD(       ) 2
 HV4501  NAD 27      -  38 53 29.33699(N)    077 00 55.20204(W) AD(       ) 2
 HV4501  NGVD 29 (07/19/86)    3.17   (m)           10.4    (f) LEVELING    3  
 HV4501
 HV4501.Superseded values are not recommended for survey control.
 HV4501
 HV4501.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4501.See file dsdata.pdf to determine how the superseded data were derived.
 HV4501
 HV4501
 HV4501  HISTORY     - Date     Condition        Report By
 HV4501  HISTORY     - 1981     MONUMENTED       CANDA
 HV4501  HISTORY     - 20180716 MARK NOT FOUND   USPSQD
 HV4501
 HV4501                          STATION DESCRIPTION
 HV4501
 HV4501'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4501'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4501'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4501'
 HV4501'STATION IS LOCATED IN THE SIDEWALK ON THE NORTHEAST CORNER OF 3RD
 HV4501'STREET N.W. AND PENNSYLVANIA AVE. N.W.
 HV4501'
 HV4501'STATION IS 32.58 FT NW OF X ON RIM PEPCO M.H. IN PA. AVE.
 HV4501'
 HV4501'STATION IS 24.20 FT. NE OF X ON RIM SAN. M.H. IN STREET.
 HV4501'
 HV4501'STATION IS 20.17 FT SE OF X ON RIM SAN. M.H. IN 3RD STREET.
 HV4501
 HV4501                          STATION RECOVERY (2018)
 HV4501
 HV4501'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV4501'SEARCHED ALL CORNERS OF THE INTERSECTION AND COULD NOT FIND ANY SIGN
 HV4501'ON THE MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1396 ***********************************************************************
 HV1396  DESIGNATION -  3 WNY
 HV1396  PID         -  HV1396
 HV1396  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1396  COUNTRY     -  US
 HV1396  USGS QUAD   -  ANACOSTIA (2016)
 HV1396
 HV1396                         *CURRENT SURVEY CONTROL
 HV1396  ______________________________________________________________________
 HV1396* NAD 83(1986) POSITION- 38 52 27.     (N) 076 59 52.     (W)   SCALED
 HV1396* NAVD 88 ORTHO HEIGHT -     2.065 (meters)        6.77  (feet) ADJUSTED
 HV1396  ______________________________________________________________________
 HV1396  GEOID HEIGHT    -        -32.177 (meters)                     GEOID18
 HV1396  DYNAMIC HEIGHT  -          2.064 (meters)        6.77  (feet) COMP
 HV1396  MODELED GRAVITY -    980,096.6   (mgal)                       NAVD 88
 HV1396
 HV1396  VERT ORDER      -  FIRST     CLASS II
 HV1396
 HV1396.The horizontal coordinates were scaled from a map and have
 HV1396.an estimated accuracy of +/- 6 seconds.
 HV1396
 HV1396.The orthometric height was determined by differential leveling and
 HV1396.adjusted by the NATIONAL GEODETIC SURVEY
 HV1396.in June 1991.
 HV1396
 HV1396.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1396.GEOID18 height accuracy estimate available here.
 HV1396
 HV1396.Click photographs - Photos may exist for this station.
 HV1396
 HV1396.The dynamic height is computed by dividing the NAVD 88
 HV1396.geopotential number by the normal gravity value computed on the
 HV1396.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1396.degrees latitude (g = 980.6199 gals.).
 HV1396
 HV1396.The modeled gravity was interpolated from observed gravity values.
 HV1396
 HV1396
 HV1396_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ266047(NAD 83)
 HV1396
 HV1396                          SUPERSEDED SURVEY CONTROL
 HV1396
 HV1396  NGVD 29 (11/26/84)    2.307  (m)            7.57   (f) ADJUSTED    1 2
 HV1396
 HV1396.Superseded values are not recommended for survey control.
 HV1396
 HV1396.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1396.See file dsdata.pdf to determine how the superseded data were derived.
 HV1396
 HV1396_MARKER: DD = SURVEY DISK
 HV1396_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1396_SP_SET: PAVEMENT
 HV1396_STAMPING: NO 3 1940
 HV1396_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1396
 HV1396  HISTORY     - Date     Condition        Report By
 HV1396  HISTORY     - 1940     MONUMENTED       USACE
 HV1396  HISTORY     - 1942     GOOD             CGS
 HV1396  HISTORY     - 1955     GOOD             CGS
 HV1396  HISTORY     - 19950810 MARK NOT FOUND   USPSQD
 HV1396
 HV1396                          STATION DESCRIPTION
 HV1396
 HV1396'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1396'IN WASHINGTON.
 HV1396'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1396'ON ISAAC HULL AVENUE, AT THE WEST END OF BUILDING 176, AT THE
 HV1396'NORTH END OF THE NORTH DOORWAY, IN THE PAVEMENT, 1.2 FEET OUT
 HV1396'FROM THE DOOR, AND 0.2 FOOT FROM THE NORTH EDGE OF THE
 HV1396'DOORWAY.  A WASHINGTON NAVY YARD STANDARD DISK, STAMPED NO 3 1940.
 HV1396
 HV1396                          STATION RECOVERY (1955)
 HV1396
 HV1396'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1396'RECOVERED IN GOOD CONDITION.
 HV1396
 HV1396                          STATION RECOVERY (1995)
 HV1396
 HV1396'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1396'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1322 ***********************************************************************
 HV1322  DESIGNATION -  302
 HV1322  PID         -  HV1322
 HV1322  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1322  COUNTRY     -  US
 HV1322  USGS QUAD   -  ANACOSTIA (2016)
 HV1322
 HV1322                         *CURRENT SURVEY CONTROL
 HV1322  ______________________________________________________________________
 HV1322* NAD 83(1986) POSITION- 38 52 28.5    (N) 076 58 53.1    (W)   HD_HELD2
 HV1322* NAVD 88 ORTHO HEIGHT -     2.485 (meters)        8.15  (feet) ADJUSTED
 HV1322  ______________________________________________________________________
 HV1322  GEOID HEIGHT    -        -32.204 (meters)                     GEOID18
 HV1322  DYNAMIC HEIGHT  -          2.484 (meters)        8.15  (feet) COMP
 HV1322  MODELED GRAVITY -    980,094.1   (mgal)                       NAVD 88
 HV1322
 HV1322  VERT ORDER      -  FIRST     CLASS II
 HV1322
 HV1322.The horizontal coordinates were established by autonomous hand held GPS
 HV1322.observations and have an estimated accuracy of +/- 10 meters.
 HV1322
 HV1322.The orthometric height was determined by differential leveling and
 HV1322.adjusted by the NATIONAL GEODETIC SURVEY
 HV1322.in August 2020.
 HV1322
 HV1322.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1322.GEOID18 height accuracy estimate available here.
 HV1322
 HV1322.Click photographs - Photos may exist for this station.
 HV1322
 HV1322.The dynamic height is computed by dividing the NAVD 88
 HV1322.geopotential number by the normal gravity value computed on the
 HV1322.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1322.degrees latitude (g = 980.6199 gals.).
 HV1322
 HV1322.The modeled gravity was interpolated from observed gravity values.
 HV1322
 HV1322
 HV1322_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2811504724(NAD 83)
 HV1322
 HV1322                          SUPERSEDED SURVEY CONTROL
 HV1322
 HV1322  NAVD 88 (06/15/91)    2.461  (m)            8.07   (f) SUPERSEDED  1 2
 HV1322  NGVD 29 (11/26/84)    2.703  (m)            8.87   (f) ADJUSTED    1 2
 HV1322
 HV1322.Superseded values are not recommended for survey control.
 HV1322
 HV1322.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1322.See file dsdata.pdf to determine how the superseded data were derived.
 HV1322
 HV1322_MARKER: DD = SURVEY DISK
 HV1322_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
 HV1322_SP_SET: HEADWALL
 HV1322_STAMPING: 302
 HV1322_MARK LOGO: PBPP
 HV1322_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1322_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1322+STABILITY: SURFACE MOTION
 HV1322_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1322+SATELLITE: SATELLITE OBSERVATIONS - January 13, 2020
 HV1322
 HV1322  HISTORY     - Date     Condition        Report By
 HV1322  HISTORY     - UNK      MONUMENTED       PBPP
 HV1322  HISTORY     - 1942     GOOD             CGS
 HV1322  HISTORY     - 1960     GOOD             CGS
 HV1322  HISTORY     - 20010723 GOOD             NGS
 HV1322  HISTORY     - 20050409 GOOD             GEOCAC
 HV1322  HISTORY     - 20071116 GOOD             PB
 HV1322  HISTORY     - 20110116 GOOD             NGS
 HV1322  HISTORY     - 20200113 GOOD             MDSHA
 HV1322
 HV1322                          STATION DESCRIPTION
 HV1322
 HV1322'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1322'IN WASHINGTON.
 HV1322'IN SOUTHEAST WASHINGTON, IN ANACOSTIA PARK, AT A SEWER OUTLET
 HV1322'ENTERING THE RIVER BETWEEN THE PENNSYLVANIA AVENUE AND ELEVENTH
 HV1322'STREET BRIDGES, BETWEEN THE FIELD HOUSE AND PENNSYLVANIA AVENUE,
 HV1322'IN THE TOP OF THE EAST CORNER OF THE CONCRETE HEADWALL, 5 INCHES
 HV1322'SOUTHWEST OF AN ORNAMENTAL STONE WALL ON TOP OF THE HEADWALL,
 HV1322'AND 7 INCHES SOUTHWEST OF THE SOUTHEAST WALL.  A PUBLIC BUILDINGS
 HV1322'AND PUBLIC PARKS STANDARD DISK, STAMPED 302.
 HV1322
 HV1322                          STATION RECOVERY (1960)
 HV1322
 HV1322'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1322'RECOVERED IN GOOD CONDITION.
 HV1322
 HV1322                          STATION RECOVERY (2001)
 HV1322
 HV1322'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 HV1322'RECOVERED IN GOOD CONDITION.  NOTE--NOT LEVELED TO.
 HV1322
 HV1322                          STATION RECOVERY (2005)
 HV1322
 HV1322'RECOVERY NOTE BY GEOCACHING 2005 (TAK)
 HV1322'RECOVERED IN GOOD CONDITION.
 HV1322
 HV1322                          STATION RECOVERY (2007)
 HV1322
 HV1322'RECOVERY NOTE BY PBS&J 2007
 HV1322'RECOVERED IN GOOD CONDITION.
 HV1322
 HV1322                          STATION RECOVERY (2011)
 HV1322
 HV1322'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2011 (DRD)
 HV1322'RECOVERED IN GOOD CONDITION.
 HV1322
 HV1322                          STATION RECOVERY (2020)
 HV1322
 HV1322'RECOVERY NOTE BY MARYLAND DOT HIGHWAY ADMINISTRATION 2020 (JML)
 HV1322'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1323 ***********************************************************************
 HV1323  DESIGNATION -  303
 HV1323  PID         -  HV1323
 HV1323  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1323  COUNTRY     -  US
 HV1323  USGS QUAD   -  ANACOSTIA (2016)
 HV1323
 HV1323                         *CURRENT SURVEY CONTROL
 HV1323  ______________________________________________________________________
 HV1323* NAD 83(1986) POSITION- 38 52 21.     (N) 076 59 01.     (W)   SCALED
 HV1323* NAVD 88 ORTHO HEIGHT -     5.486 (meters)       18.00  (feet) ADJUSTED
 HV1323  ______________________________________________________________________
 HV1323  GEOID HEIGHT    -        -32.203 (meters)                     GEOID18
 HV1323  DYNAMIC HEIGHT  -          5.483 (meters)       17.99  (feet) COMP
 HV1323  MODELED GRAVITY -    980,093.9   (mgal)                       NAVD 88
 HV1323
 HV1323  VERT ORDER      -  FIRST     CLASS II
 HV1323
 HV1323.The horizontal coordinates were scaled from a map and have
 HV1323.an estimated accuracy of +/- 6 seconds.
 HV1323
 HV1323.The orthometric height was determined by differential leveling and
 HV1323.adjusted by the NATIONAL GEODETIC SURVEY
 HV1323.in June 1991.
 HV1323
 HV1323.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1323.GEOID18 height accuracy estimate available here.
 HV1323
 HV1323.Click photographs - Photos may exist for this station.
 HV1323
 HV1323.The dynamic height is computed by dividing the NAVD 88
 HV1323.geopotential number by the normal gravity value computed on the
 HV1323.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1323.degrees latitude (g = 980.6199 gals.).
 HV1323
 HV1323.The modeled gravity was interpolated from observed gravity values.
 HV1323
 HV1323
 HV1323_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ279044(NAD 83)
 HV1323
 HV1323                          SUPERSEDED SURVEY CONTROL
 HV1323
 HV1323  NGVD 29 (11/26/84)    5.736  (m)           18.82   (f) ADJUSTED    1 2
 HV1323
 HV1323.Superseded values are not recommended for survey control.
 HV1323
 HV1323.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1323.See file dsdata.pdf to determine how the superseded data were derived.
 HV1323
 HV1323_MARKER: DD = SURVEY DISK
 HV1323_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1323_SP_SET: PORCH OF FIELDHOUSE
 HV1323_STAMPING: 303
 HV1323_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1323
 HV1323  HISTORY     - Date     Condition        Report By
 HV1323  HISTORY     - UNK      MONUMENTED       PBPP
 HV1323  HISTORY     - 1942     GOOD             CGS
 HV1323  HISTORY     - 1957     GOOD             CGS
 HV1323
 HV1323                          STATION DESCRIPTION
 HV1323
 HV1323'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1323'IN WASHINGTON.
 HV1323'IN SOUTHEAST WASHINGTON, IN ANACOSTIA PARK, BETWEEN THE
 HV1323'PENNSYLVANIA AVENUE AND THE ELEVENTH STREET BRIDGES, AT THE
 HV1323'FIELD HOUSE, IN THE SOUTH CORNER OF THE CONCRETE PORCH, 4
 HV1323'FEET NORTHWEST OF THE NORTHWEST WALL, AND 1 FOOT NORTHEAST OF
 HV1323'THE NORTHEAST FACE OF AN OFFSET.  A PUBLIC BUILDINGS AND PUBLIC
 HV1323'PARKS STANDARD DISK, STAMPED 303.
 HV1323
 HV1323                          STATION RECOVERY (1957)
 HV1323
 HV1323'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1957
 HV1323'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1324 ***********************************************************************
 HV1324  DESIGNATION -  304
 HV1324  PID         -  HV1324
 HV1324  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1324  COUNTRY     -  US
 HV1324  USGS QUAD   -  ANACOSTIA (2016)
 HV1324
 HV1324                         *CURRENT SURVEY CONTROL
 HV1324  ______________________________________________________________________
 HV1324* NAD 83(1986) POSITION- 38 52 22.3    (N) 076 59 06.9    (W)   HD_HELD2
 HV1324* NAVD 88 ORTHO HEIGHT -     2.471 (meters)        8.11  (feet) ADJUSTED
 HV1324  ______________________________________________________________________
 HV1324  GEOID HEIGHT    -        -32.200 (meters)                     GEOID18
 HV1324  DYNAMIC HEIGHT  -          2.469 (meters)        8.10  (feet) COMP
 HV1324  MODELED GRAVITY -    980,094.3   (mgal)                       NAVD 88
 HV1324
 HV1324  VERT ORDER      -  FIRST     CLASS II
 HV1324
 HV1324.The horizontal coordinates were established by autonomous hand held GPS
 HV1324.observations and have an estimated accuracy of +/- 10 meters.
 HV1324
 HV1324.The orthometric height was determined by differential leveling and
 HV1324.adjusted by the NATIONAL GEODETIC SURVEY
 HV1324.in August 2020.
 HV1324
 HV1324.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1324.GEOID18 height accuracy estimate available here.
 HV1324
 HV1324.Click photographs - Photos may exist for this station.
 HV1324
 HV1324.The dynamic height is computed by dividing the NAVD 88
 HV1324.geopotential number by the normal gravity value computed on the
 HV1324.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1324.degrees latitude (g = 980.6199 gals.).
 HV1324
 HV1324.The modeled gravity was interpolated from observed gravity values.
 HV1324
 HV1324
 HV1324_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2777904540(NAD 83)
 HV1324
 HV1324                          SUPERSEDED SURVEY CONTROL
 HV1324
 HV1324  NAVD 88 (06/15/91)    2.456  (m)            8.06   (f) SUPERSEDED  1 2
 HV1324  NGVD 29 (11/26/84)    2.698  (m)            8.85   (f) ADJUSTED    1 2
 HV1324
 HV1324.Superseded values are not recommended for survey control.
 HV1324
 HV1324.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1324.See file dsdata.pdf to determine how the superseded data were derived.
 HV1324
 HV1324_MARKER: DD = SURVEY DISK
 HV1324_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
 HV1324_SP_SET: HEADWALL
 HV1324_STAMPING: 304
 HV1324_MARK LOGO: PBPP
 HV1324_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1324_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1324+STABILITY: SURFACE MOTION
 HV1324_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1324+SATELLITE: SATELLITE OBSERVATIONS - January 13, 2020
 HV1324
 HV1324  HISTORY     - Date     Condition        Report By
 HV1324  HISTORY     - UNK      MONUMENTED       PBPP
 HV1324  HISTORY     - 1942     GOOD             CGS
 HV1324  HISTORY     - 1960     GOOD             CGS
 HV1324  HISTORY     - 20010723 GOOD             NGS
 HV1324  HISTORY     - 20050409 GOOD             GEOCAC
 HV1324  HISTORY     - 20071116 GOOD             PB
 HV1324  HISTORY     - 20200113 GOOD             MDSHA
 HV1324
 HV1324                          STATION DESCRIPTION
 HV1324
 HV1324'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1324'IN WASHINGTON.
 HV1324'IN SOUTHEAST WASHINGTON, IN ANACOSTIA PARK, 200 YARDS WEST
 HV1324'OF THE FIELD HOUSE, AT THE SECOND SEWER OUTLET NORTHEAST OF THE
 HV1324'ELEVENTH STREET BRIDGE, IN THE TOP OF THE EAST CORNER OF THE
 HV1324'CONCRETE HEADWALL, 5 INCHES SOUTHWEST OF THE NORTHEAST COPING,
 HV1324'AND 8 INCHES NORTHWEST OF THE SOUTHEAST COPING.  A PUBLIC
 HV1324'BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED 304.
 HV1324
 HV1324                          STATION RECOVERY (1960)
 HV1324
 HV1324'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1324'RECOVERED IN GOOD CONDITION.
 HV1324
 HV1324                          STATION RECOVERY (2001)
 HV1324
 HV1324'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 HV1324'RECOVERED AS DESCRIBED.
 HV1324
 HV1324                          STATION RECOVERY (2005)
 HV1324
 HV1324'RECOVERY NOTE BY GEOCACHING 2005 (TAK)
 HV1324'RECOVERED IN GOOD CONDITION.
 HV1324
 HV1324                          STATION RECOVERY (2007)
 HV1324
 HV1324'RECOVERY NOTE BY PBS&J 2007
 HV1324'RECOVERED IN GOOD CONDITION.
 HV1324
 HV1324                          STATION RECOVERY (2020)
 HV1324
 HV1324'RECOVERY NOTE BY MARYLAND DOT HIGHWAY ADMINISTRATION 2020 (JML)
 HV1324'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1325 ***********************************************************************
 HV1325  DESIGNATION -  305
 HV1325  PID         -  HV1325
 HV1325  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1325  COUNTRY     -  US
 HV1325  USGS QUAD   -  ANACOSTIA (2016)
 HV1325
 HV1325                         *CURRENT SURVEY CONTROL
 HV1325  ______________________________________________________________________
 HV1325* NAD 83(1986) POSITION- 38 52 15.     (N) 076 59 18.     (W)   SCALED
 HV1325* NAVD 88 ORTHO HEIGHT -     2.222 (meters)        7.29  (feet) ADJUSTED
 HV1325  ______________________________________________________________________
 HV1325  GEOID HEIGHT    -        -32.198 (meters)                     GEOID18
 HV1325  DYNAMIC HEIGHT  -          2.221 (meters)        7.29  (feet) COMP
 HV1325  MODELED GRAVITY -    980,094.4   (mgal)                       NAVD 88
 HV1325
 HV1325  VERT ORDER      -  FIRST     CLASS II
 HV1325
 HV1325.The horizontal coordinates were scaled from a map and have
 HV1325.an estimated accuracy of +/- 6 seconds.
 HV1325
 HV1325.The orthometric height was determined by differential leveling and
 HV1325.adjusted by the NATIONAL GEODETIC SURVEY
 HV1325.in June 1991.
 HV1325
 HV1325.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1325.GEOID18 height accuracy estimate available here.
 HV1325
 HV1325.Click photographs - Photos may exist for this station.
 HV1325
 HV1325.The dynamic height is computed by dividing the NAVD 88
 HV1325.geopotential number by the normal gravity value computed on the
 HV1325.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1325.degrees latitude (g = 980.6199 gals.).
 HV1325
 HV1325.The modeled gravity was interpolated from observed gravity values.
 HV1325
 HV1325
 HV1325_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ275043(NAD 83)
 HV1325
 HV1325                          SUPERSEDED SURVEY CONTROL
 HV1325
 HV1325  NGVD 29 (11/26/84)    2.464  (m)            8.08   (f) ADJUSTED    1 2
 HV1325
 HV1325.Superseded values are not recommended for survey control.
 HV1325
 HV1325.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1325.See file dsdata.pdf to determine how the superseded data were derived.
 HV1325
 HV1325_MARKER: DD = SURVEY DISK
 HV1325_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1325_SP_SET: SEWER OUTLET
 HV1325_STAMPING: 305
 HV1325_MARK LOGO: PBPP
 HV1325_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1325_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1325_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1325+SATELLITE: SATELLITE OBSERVATIONS - July 23, 2001
 HV1325
 HV1325  HISTORY     - Date     Condition        Report By
 HV1325  HISTORY     - UNK      MONUMENTED       PBPP
 HV1325  HISTORY     - 1942     GOOD             CGS
 HV1325  HISTORY     - 1960     GOOD             CGS
 HV1325  HISTORY     - 20010723 GOOD             NGS
 HV1325
 HV1325                          STATION DESCRIPTION
 HV1325
 HV1325'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1325'IN WASHINGTON.
 HV1325'IN SOUTHEAST WASHINGTON, IN ANACOSTIA PARK, 100 YARDS NORTHEAST
 HV1325'OF THE ELEVENTH STREET BRIDGE, AT THE FIRST SEWER OUTLET
 HV1325'NORTHEAST OF THE BRIDGE, IN THE TOP OF THE CONCRETE SLAB OVER THE
 HV1325'OUTLET, 7 INCHES NORTHWEST OF THE SOUTHEAST COPING, AND 7.5
 HV1325'INCHES NORTHEAST OF THE SOUTHWEST COPING.  A PUBLIC BUILDINGS
 HV1325'AND PUBLIC PARKS STANDARD DISK, STAMPED 305.
 HV1325
 HV1325                          STATION RECOVERY (1960)
 HV1325
 HV1325'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1325'RECOVERED IN GOOD CONDITION.
 HV1325
 HV1325                          STATION RECOVERY (2001)
 HV1325
 HV1325'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 HV1325'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1327 ***********************************************************************
 HV1327  DESIGNATION -  306
 HV1327  PID         -  HV1327
 HV1327  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1327  COUNTRY     -  US
 HV1327  USGS QUAD   -  ANACOSTIA (2016)
 HV1327
 HV1327                         *CURRENT SURVEY CONTROL
 HV1327  ______________________________________________________________________
 HV1327* NAD 83(1986) POSITION- 38 51 43.6    (N) 076 59 37.1    (W)   HD_HELD2
 HV1327* NAVD 88 ORTHO HEIGHT -    13.73  (+/-2cm)       45.0   (feet) VERTCON3
 HV1327  ______________________________________________________________________
 HV1327  GEOID HEIGHT    -        -32.202 (meters)                     GEOID18
 HV1327  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1327
 HV1327.The horizontal coordinates were established by autonomous hand held GPS
 HV1327.observations and have an estimated accuracy of +/- 10 meters.
 HV1327
 HV1327.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1327.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1327
 HV1327.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1327.GEOID18 height accuracy estimate available here.
 HV1327
 HV1327.The vertical order pertains to the NGVD 29 superseded value.
 HV1327
 HV1327.Click photographs - Photos may exist for this station.
 HV1327
 HV1327
 HV1327_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2702503363(NAD 83)
 HV1327
 HV1327                          SUPERSEDED SURVEY CONTROL
 HV1327
 HV1327  NGVD 29 (11/26/84)   13.979  (m)           45.86   (f) ADJUSTED    1 2
 HV1327
 HV1327.Superseded values are not recommended for survey control.
 HV1327
 HV1327.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1327.See file dsdata.pdf to determine how the superseded data were derived.
 HV1327
 HV1327_MARKER: DD = SURVEY DISK
 HV1327_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1327_SP_SET: SCHOOL BUILDING
 HV1327_STAMPING: 306
 HV1327_MARK LOGO: PBPP
 HV1327_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1327_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1327+SATELLITE: SATELLITE OBSERVATIONS - January 13, 2020
 HV1327
 HV1327  HISTORY     - Date     Condition        Report By
 HV1327  HISTORY     - 1931     MONUMENTED       PBPP
 HV1327  HISTORY     - 1942     GOOD             CGS
 HV1327  HISTORY     - 1943     GOOD             CGS
 HV1327  HISTORY     - 20110116 GOOD             NGS
 HV1327  HISTORY     - 20130417 GOOD             GEOMET
 HV1327  HISTORY     - 20200113 GOOD             ARCSHE
 HV1327
 HV1327                          STATION DESCRIPTION
 HV1327
 HV1327'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1327'IN WASHINGTON.
 HV1327'IN SOUTHEAST WASHINGTON, ON NICHOLS AVENUE SOUTHEAST, BETWEEN
 HV1327'NESSER AND HOWARD STREETS, AT BIRNEY SCHOOL, IN THE EAST WALL,
 HV1327'2.6 FEET NORTH OF THE SOUTHEAST CORNER, AND 2.5 FEET ABOVE THE
 HV1327'GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK,
 HV1327'STAMPED 306 AND SET VERTICALLY.
 HV1327
 HV1327                          STATION RECOVERY (1943)
 HV1327
 HV1327'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943
 HV1327'RECOVERED IN GOOD CONDITION.
 HV1327
 HV1327                          STATION RECOVERY (2011)
 HV1327
 HV1327'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2011 (DRD)
 HV1327'THE BUILDING IS NOW THE THURGOOD MARSHALL ACADEMY PUBLIC CHARTER
 HV1327'SCHOOL AND IS LOCATED AT 2427 MARTIN LUTHER KING JR. AVE., SE.
 HV1327
 HV1327                          STATION RECOVERY (2013)
 HV1327
 HV1327'RECOVERY NOTE BY GEOMETRICS GPS INCORPORATED 2013 (DWB)
 HV1327'RECOVERED AS DESCRIBED.
 HV1327
 HV1327                          STATION RECOVERY (2020)
 HV1327
 HV1327'RECOVERY NOTE BY ARCHER-SHEE LAND SURVEYING 2020 (MRA)
 HV1327'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1328 ***********************************************************************
 HV1328  DESIGNATION -  307
 HV1328  PID         -  HV1328
 HV1328  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1328  COUNTRY     -  US
 HV1328  USGS QUAD   -  ANACOSTIA (2016)
 HV1328
 HV1328                         *CURRENT SURVEY CONTROL
 HV1328  ______________________________________________________________________
 HV1328* NAD 83(1986) POSITION- 38 51 10.74   (N) 076 59 46.26   (W)   HD_HELD1
 HV1328* NAVD 88 ORTHO HEIGHT -    52.21  (+/-2cm)      171.3   (feet) VERTCON3
 HV1328  ______________________________________________________________________
 HV1328  GEOID HEIGHT    -        -32.210 (meters)                     GEOID18
 HV1328  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1328
 HV1328.The horizontal coordinates were determined by differentially corrected
 HV1328.hand held GPS observations or other comparable positioning techniques
 HV1328.and have an estimated accuracy of +/- 3 meters.
 HV1328
 HV1328.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1328.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1328
 HV1328.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1328.GEOID18 height accuracy estimate available here.
 HV1328
 HV1328.The vertical order pertains to the NGVD 29 superseded value.
 HV1328
 HV1328.Click photographs - Photos may exist for this station.
 HV1328
 HV1328
 HV1328_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2678202355(NAD 83)
 HV1328
 HV1328                          SUPERSEDED SURVEY CONTROL
 HV1328
 HV1328  NGVD 29 (11/26/84)   52.461  (m)          172.12   (f) ADJUSTED    1 2
 HV1328
 HV1328.Superseded values are not recommended for survey control.
 HV1328
 HV1328.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1328.See file dsdata.pdf to determine how the superseded data were derived.
 HV1328
 HV1328_MARKER: DD = SURVEY DISK
 HV1328_SETTING: 9 = POST (STONE OR PRECAST CONCRETE)
 HV1328_SP_SET: GATEPOST
 HV1328_STAMPING: 307
 HV1328_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1328_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1328+SATELLITE: SATELLITE OBSERVATIONS - July 27, 2018
 HV1328
 HV1328  HISTORY     - Date     Condition        Report By
 HV1328  HISTORY     - 1931     MONUMENTED       PBPP
 HV1328  HISTORY     - 1942     GOOD             CGS
 HV1328  HISTORY     - 1943     GOOD             CGS
 HV1328  HISTORY     - 20030901 GOOD             GEOCAC
 HV1328  HISTORY     - 20110116 GOOD             NGS
 HV1328  HISTORY     - 20180727 GOOD             PLSLLC
 HV1328
 HV1328                          STATION DESCRIPTION
 HV1328
 HV1328'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1328'IN WASHINGTON.
 HV1328'IN SOUTHEAST WASHINGTON, ON NICHOLS AVENUE SE, AT ST. ELIZABETHS
 HV1328'HOSPITAL, AT GATE 2, IN THE E SIDE OF THE S GATEPOST, AND 9
 HV1328'IN ABOVE THE GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS
 HV1328'STANDARD DISK, STAMPED 307 AND SET VERTICALLY.
 HV1328
 HV1328                          STATION RECOVERY (1943)
 HV1328
 HV1328'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943
 HV1328'RECOVERED IN GOOD CONDITION.
 HV1328
 HV1328                          STATION RECOVERY (2003)
 HV1328
 HV1328'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV1328'NICHOLS AVENUE IS NOW KNOWN AS MARTIN LUTHER KING, JR., AVENUE
 HV1328
 HV1328                          STATION RECOVERY (2011)
 HV1328
 HV1328'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2011 (DRD)
 HV1328'RECOVERED IN GOOD CONDITION.
 HV1328
 HV1328                          STATION RECOVERY (2018)
 HV1328
 HV1328'RECOVERY NOTE BY PENDER LAND SURVEYORS 2018 (MRB)
 HV1328'A CHAIN LINK CONSTRUCTION FENCE PARTIALLY OBSTRUCTS MARK BUT IT IS
 HV1328'STILL USABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2047 ***********************************************************************
 HV2047  DESIGNATION -  308
 HV2047  PID         -  HV2047
 HV2047  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2047  COUNTRY     -  US
 HV2047  USGS QUAD   -  ALEXANDRIA (2019)
 HV2047
 HV2047                         *CURRENT SURVEY CONTROL
 HV2047  ______________________________________________________________________
 HV2047* NAD 83(1986) POSITION- 38 50 34.4    (N) 077 00 02.4    (W)   HD_HELD2
 HV2047* NAVD 88 ORTHO HEIGHT -    53.708 (meters)      176.21  (feet) ADJUSTED
 HV2047  ______________________________________________________________________
 HV2047  GEOID HEIGHT    -        -32.218 (meters)                     GEOID18
 HV2047  DYNAMIC HEIGHT  -         53.679 (meters)      176.11  (feet) COMP
 HV2047  MODELED GRAVITY -    980,089.5   (mgal)                       NAVD 88
 HV2047
 HV2047  VERT ORDER      -  FIRST     CLASS II
 HV2047
 HV2047.The horizontal coordinates were established by autonomous hand held GPS
 HV2047.observations and have an estimated accuracy of +/- 10 meters.
 HV2047
 HV2047.The orthometric height was determined by differential leveling and
 HV2047.adjusted by the NATIONAL GEODETIC SURVEY
 HV2047.in June 1991.
 HV2047
 HV2047.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2047.GEOID18 height accuracy estimate available here.
 HV2047
 HV2047.Click photographs - Photos may exist for this station.
 HV2047
 HV2047.The dynamic height is computed by dividing the NAVD 88
 HV2047.geopotential number by the normal gravity value computed on the
 HV2047.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2047.degrees latitude (g = 980.6199 gals.).
 HV2047
 HV2047.The modeled gravity was interpolated from observed gravity values.
 HV2047
 HV2047
 HV2047_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2636801243(NAD 83)
 HV2047
 HV2047                          SUPERSEDED SURVEY CONTROL
 HV2047
 HV2047  NGVD 29 (11/26/84)   53.950  (m)          177.00   (f) ADJUSTED    1 2
 HV2047
 HV2047.Superseded values are not recommended for survey control.
 HV2047
 HV2047.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2047.See file dsdata.pdf to determine how the superseded data were derived.
 HV2047
 HV2047_MARKER: DD = SURVEY DISK
 HV2047_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV2047_SP_SET: BUILDING
 HV2047_STAMPING: 308
 HV2047_MARK LOGO: PBPP
 HV2047_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV2047_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV2047+SATELLITE: SATELLITE OBSERVATIONS - October 05, 2011
 HV2047
 HV2047  HISTORY     - Date     Condition        Report By
 HV2047  HISTORY     - UNK      MONUMENTED       PBPP
 HV2047  HISTORY     - 1931     GOOD             PBPP
 HV2047  HISTORY     - 1960     GOOD             CGS
 HV2047  HISTORY     - 20030828 GOOD             GEOCAC
 HV2047  HISTORY     - 20111005 GOOD             NGS
 HV2047
 HV2047                          STATION DESCRIPTION
 HV2047
 HV2047'DESCRIBED BY PUB BLDGS AND PARKS 1931
 HV2047'IN WASHINGTON.
 HV2047'IN SOUTHEAST WASHINGTON, AT THE INTERSECTION OF NICHOLS AVENUE
 HV2047'AND FOURTH STREET SOUTHEAST, AT FIRE STATION NO. 25, AT THE
 HV2047'CENTER ENTRANCE (THIS ENTRANCE PROJECTS ABOUT 4 FEET FROM THE
 HV2047'MAIN PORTION OF THE BUILDING), IN THE NORTH WALL OF THIS PROJECTING
 HV2047'ENTRANCE, AND 38 INCHES ABOVE THE PAVEMENT.  A PUBLIC BUILDINGS
 HV2047'AND PUBLIC PARKS STANDARD DISK, STAMPED 308 AND SET VERTICALLY.
 HV2047
 HV2047                          STATION RECOVERY (1960)
 HV2047
 HV2047'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV2047'RECOVERED IN GOOD CONDITION.
 HV2047
 HV2047                          STATION RECOVERY (2003)
 HV2047
 HV2047'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV2047'NICHOLS AVENUE IS NOW KNOWN AS MARTIN LUTHER KING, JR., AVENUE
 HV2047
 HV2047                          STATION RECOVERY (2011)
 HV2047
 HV2047'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2011 (DRD)
 HV2047'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2049 ***********************************************************************
 HV2049  DESIGNATION -  309
 HV2049  PID         -  HV2049
 HV2049  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2049  COUNTRY     -  US
 HV2049  USGS QUAD   -  ALEXANDRIA (2019)
 HV2049
 HV2049                         *CURRENT SURVEY CONTROL
 HV2049  ______________________________________________________________________
 HV2049* NAD 83(1986) POSITION- 38 50 16.0    (N) 077 00 23.2    (W)   HD_HELD2
 HV2049* NAVD 88 ORTHO HEIGHT -    52.355 (meters)      171.77  (feet) ADJUSTED
 HV2049  ______________________________________________________________________
 HV2049  GEOID HEIGHT    -        -32.219 (meters)                     GEOID18
 HV2049  DYNAMIC HEIGHT  -         52.327 (meters)      171.68  (feet) COMP
 HV2049  MODELED GRAVITY -    980,089.8   (mgal)                       NAVD 88
 HV2049
 HV2049  VERT ORDER      -  FIRST     CLASS II
 HV2049
 HV2049.The horizontal coordinates were established by autonomous hand held GPS
 HV2049.observations and have an estimated accuracy of +/- 10 meters.
 HV2049
 HV2049.The orthometric height was determined by differential leveling and
 HV2049.adjusted by the NATIONAL GEODETIC SURVEY
 HV2049.in June 1991.
 HV2049
 HV2049.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2049.GEOID18 height accuracy estimate available here.
 HV2049
 HV2049.Click photographs - Photos may exist for this station.
 HV2049
 HV2049.The dynamic height is computed by dividing the NAVD 88
 HV2049.geopotential number by the normal gravity value computed on the
 HV2049.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2049.degrees latitude (g = 980.6199 gals.).
 HV2049
 HV2049.The modeled gravity was interpolated from observed gravity values.
 HV2049
 HV2049
 HV2049_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2585400687(NAD 83)
 HV2049
 HV2049                          SUPERSEDED SURVEY CONTROL
 HV2049
 HV2049  NGVD 29 (11/26/84)   52.650  (m)          172.74   (f) ADJUSTED    1 2
 HV2049
 HV2049.Superseded values are not recommended for survey control.
 HV2049
 HV2049.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2049.See file dsdata.pdf to determine how the superseded data were derived.
 HV2049
 HV2049_MARKER: DD = SURVEY DISK
 HV2049_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV2049_SP_SET: BUILDING
 HV2049_STAMPING: 309
 HV2049_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV2049_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV2049+SATELLITE: SATELLITE OBSERVATIONS - April 11, 2013
 HV2049
 HV2049  HISTORY     - Date     Condition        Report By
 HV2049  HISTORY     - UNK      MONUMENTED       PBPP
 HV2049  HISTORY     - 1931     GOOD             PBPP
 HV2049  HISTORY     - 1943     GOOD             CGS
 HV2049  HISTORY     - 20111005 GOOD             NGS
 HV2049  HISTORY     - 20130411 GOOD             GEOMET
 HV2049
 HV2049                          STATION DESCRIPTION
 HV2049
 HV2049'DESCRIBED BY PUB BLDGS AND PARKS 1931
 HV2049'IN WASHINGTON.
 HV2049'IN SOUTHEAST WASHINGTON, AT A STORE BUILDING AT 3707 NICHOLS
 HV2049'AVENUE SOUTHEAST, IN THE SOUTH BRICK WALL, 7 INCHES WEST OF
 HV2049'THE SOUTHEAST CORNER OF THE BUILDING, AND 15 INCHES ABOVE THE
 HV2049'GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK,
 HV2049'STAMPED 309 AND SET VERTICALLY.
 HV2049
 HV2049                          STATION RECOVERY (1943)
 HV2049
 HV2049'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943
 HV2049'RECOVERED IN GOOD CONDITION.
 HV2049
 HV2049                          STATION RECOVERY (2011)
 HV2049
 HV2049'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2011 (DRD)
 HV2049'BUILDING IS NOW OCCUPIED BY THE OPPORTUNITIES INDUSTRIALIZATION CENTER
 HV2049'OF D.C.. MARK IS 7 INCHES WEST OF THE SOUTHWEST CORNER AND HAS BEEN
 HV2049'PAINTED OVER.
 HV2049
 HV2049                          STATION RECOVERY (2013)
 HV2049
 HV2049'RECOVERY NOTE BY GEOMETRICS GPS INCORPORATED 2013 (DWB)
 HV2049'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1978 ***********************************************************************
 HV1978  DESIGNATION -  31
 HV1978  PID         -  HV1978
 HV1978  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1978  COUNTRY     -  US
 HV1978  USGS QUAD   -  ALEXANDRIA (2019)
 HV1978
 HV1978                         *CURRENT SURVEY CONTROL
 HV1978  ______________________________________________________________________
 HV1978* NAD 83(1986) POSITION- 38 52 26.     (N) 077 01 03.     (W)   SCALED
 HV1978* NAVD 88 ORTHO HEIGHT -     6.322 (meters)       20.74  (feet) POSTED
 HV1978  ______________________________________________________________________
 HV1978  GEOID HEIGHT    -        -32.145 (meters)                     GEOID18
 HV1978  DYNAMIC HEIGHT  -          6.32  (meters)       20.7   (feet) COMP
 HV1978  MODELED GRAVITY -    980,097.2   (mgal)                       NAVD 88
 HV1978
 HV1978  VERT ORDER      -  * POSTED, SEE BELOW
 HV1978
 HV1978.The horizontal coordinates were scaled from a map and have
 HV1978.an estimated accuracy of +/- 6 seconds.
 HV1978
 HV1978.The orthometric height was determined by differential leveling
 HV1978.and adjusted by the NATIONAL GEODETIC SURVEY in 1992.
 HV1978
 HV1978.* This is a POSTED BENCH MARK height.
 HV1978
 HV1978.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1978.GEOID18 height accuracy estimate available here.
 HV1978
 HV1978.Click photographs - Photos may exist for this station.
 HV1978
 HV1978.The dynamic height is computed by dividing the NAVD 88
 HV1978.geopotential number by the normal gravity value computed on the
 HV1978.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1978.degrees latitude (g = 980.6199 gals.).
 HV1978
 HV1978.The modeled gravity was interpolated from observed gravity values.
 HV1978
 HV1978
 HV1978_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ249047(NAD 83)
 HV1978
 HV1978                          SUPERSEDED SURVEY CONTROL
 HV1978
 HV1978  NGVD 29 (11/26/84)    6.559  (m)           21.52   (f) ADJUSTED    1 2
 HV1978
 HV1978.Superseded values are not recommended for survey control.
 HV1978
 HV1978.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1978.See file dsdata.pdf to determine how the superseded data were derived.
 HV1978
 HV1978_MARKER: X = CHISELED CROSS
 HV1978_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1978_SP_SET: DOORSILL
 HV1978_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1978
 HV1978  HISTORY     - Date     Condition        Report By
 HV1978  HISTORY     - UNK      MONUMENTED       NONE
 HV1978  HISTORY     - 1923     GOOD             CGS
 HV1978  HISTORY     - 1941     GOOD             CGS
 HV1978  HISTORY     - 19920512 MARK NOT FOUND   NGS
 HV1978
 HV1978                          STATION DESCRIPTION
 HV1978
 HV1978'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1978'AT WASHINGTON.
 HV1978'AT WASHINGTON, ON THE EAST SIDE OF FOURTH STREET SOUTHWEST, SOUTH
 HV1978'OF N STREET, AT THE FIRST CHURCH OF CHRIST, AND ON THE SOUTH END
 HV1978'OF THE STONE DOORSILL.  A CHISELED CROSS.
 HV1978
 HV1978                          STATION RECOVERY (1941)
 HV1978
 HV1978'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1941
 HV1978'RECOVERED IN GOOD CONDITION.
 HV1978
 HV1978                          STATION RECOVERY (1992)
 HV1978
 HV1978'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1978'THERE IS A NEW BUILDING AT THE DESCRIBED LOCATION.  ASSUMED DESTROYED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2053 ***********************************************************************
 HV2053  DESIGNATION -  314 PBPP
 HV2053  PID         -  HV2053
 HV2053  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2053  COUNTRY     -  US
 HV2053  USGS QUAD   -  ALEXANDRIA (2019)
 HV2053
 HV2053                         *CURRENT SURVEY CONTROL
 HV2053  ______________________________________________________________________
 HV2053* NAD 83(1986) POSITION- 38 49 22.     (N) 077 01 17.     (W)   SCALED
 HV2053* NAVD 88 ORTHO HEIGHT -     7.288 (meters)       23.91  (feet) ADJUSTED
 HV2053  ______________________________________________________________________
 HV2053  GEOID HEIGHT    -        -32.223 (meters)                     GEOID18
 HV2053  DYNAMIC HEIGHT  -          7.284 (meters)       23.90  (feet) COMP
 HV2053  MODELED GRAVITY -    980,090.3   (mgal)                       NAVD 88
 HV2053
 HV2053  VERT ORDER      -  FIRST     CLASS II
 HV2053
 HV2053.The horizontal coordinates were scaled from a map and have
 HV2053.an estimated accuracy of +/- 6 seconds.
 HV2053
 HV2053.The orthometric height was determined by differential leveling and
 HV2053.adjusted by the NATIONAL GEODETIC SURVEY
 HV2053.in June 1991.
 HV2053
 HV2053.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2053.GEOID18 height accuracy estimate available here.
 HV2053
 HV2053.Click photographs - Photos may exist for this station.
 HV2053
 HV2053.The dynamic height is computed by dividing the NAVD 88
 HV2053.geopotential number by the normal gravity value computed on the
 HV2053.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2053.degrees latitude (g = 980.6199 gals.).
 HV2053
 HV2053.The modeled gravity was interpolated from observed gravity values.
 HV2053
 HV2053
 HV2053_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH245990(NAD 83)
 HV2053
 HV2053                          SUPERSEDED SURVEY CONTROL
 HV2053
 HV2053  NGVD 29 (11/26/84)    7.552  (m)           24.78   (f) ADJUSTED    1 2
 HV2053
 HV2053.Superseded values are not recommended for survey control.
 HV2053
 HV2053.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2053.See file dsdata.pdf to determine how the superseded data were derived.
 HV2053
 HV2053_MARKER: DD = SURVEY DISK
 HV2053_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2053_SP_SET: PLATFORM
 HV2053_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2053
 HV2053  HISTORY     - Date     Condition        Report By
 HV2053  HISTORY     - UNK      MONUMENTED       PBPP
 HV2053  HISTORY     - 1931     GOOD             PBPP
 HV2053  HISTORY     - 1950     GOOD             CGS
 HV2053
 HV2053                          STATION DESCRIPTION
 HV2053
 HV2053'DESCRIBED BY PUB BLDGS AND PARKS 1931
 HV2053'IN WASHINGTON.
 HV2053'IN SOUTHEAST WASHINGTON, AT THE NAVAL MAGAZINE LABORATORY AT
 HV2053'BELLEVUE, 50 YARDS NORTH OF THE WIRE FENCE THAT SEPARATES THE
 HV2053'NAVAL MAGAZINE FROM THE NAVAL RESEARCH LABORATORY, AT THE EAST
 HV2053'SIDE OF BUILDING 7, IN THE NORTH END OF THE CONCRETE LOADING
 HV2053'PLATFORM (THIS PLATFORM IS ABOUT 25 YARDS WEST OF THE MAIN
 HV2053'BALTIMORE AND OHIO RAILROAD TRACKS WHICH CROSS LABORATORY ROAD
 HV2053'IN THE NAVAL RESEARCH LABORATORY GROUNDS BETWEEN THE EAST AND
 HV2053'WEST MALLS), 11 INCHES WEST OF THE EAST EDGE OF THE PLATFORM,
 HV2053'AND 11 INCHES SOUTH OF THE NORTH EDGE.  A PUBLIC BUILDINGS
 HV2053'AND PUBLIC PARKS STANDARD DISK.
 HV2053
 HV2053                          STATION RECOVERY (1950)
 HV2053
 HV2053'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1950
 HV2053'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2046 ***********************************************************************
 HV2046  DESIGNATION -  317 PBPP
 HV2046  PID         -  HV2046
 HV2046  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2046  COUNTRY     -  US
 HV2046  USGS QUAD   -  ALEXANDRIA (2019)
 HV2046
 HV2046                         *CURRENT SURVEY CONTROL
 HV2046  ______________________________________________________________________
 HV2046* NAD 83(1986) POSITION- 38 51 26.     (N) 077 00 53.     (W)   SCALED
 HV2046* NAVD 88 ORTHO HEIGHT -     1.162 (meters)        3.81  (feet) ADJUSTED
 HV2046  ______________________________________________________________________
 HV2046  GEOID HEIGHT    -        -32.178 (meters)                     GEOID18
 HV2046  DYNAMIC HEIGHT  -          1.161 (meters)        3.81  (feet) COMP
 HV2046  MODELED GRAVITY -    980,094.1   (mgal)                       NAVD 88
 HV2046
 HV2046  VERT ORDER      -  FIRST     CLASS II
 HV2046
 HV2046.The horizontal coordinates were scaled from a map and have
 HV2046.an estimated accuracy of +/- 6 seconds.
 HV2046
 HV2046.The orthometric height was determined by differential leveling and
 HV2046.adjusted by the NATIONAL GEODETIC SURVEY
 HV2046.in June 1991.
 HV2046
 HV2046.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2046.GEOID18 height accuracy estimate available here.
 HV2046
 HV2046.Click photographs - Photos may exist for this station.
 HV2046
 HV2046.The dynamic height is computed by dividing the NAVD 88
 HV2046.geopotential number by the normal gravity value computed on the
 HV2046.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2046.degrees latitude (g = 980.6199 gals.).
 HV2046
 HV2046.The modeled gravity was interpolated from observed gravity values.
 HV2046
 HV2046
 HV2046_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ251028(NAD 83)
 HV2046
 HV2046                          SUPERSEDED SURVEY CONTROL
 HV2046
 HV2046  NGVD 29 (11/26/84)    1.423  (m)            4.67   (f) ADJUSTED    1 2
 HV2046
 HV2046.Superseded values are not recommended for survey control.
 HV2046
 HV2046.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2046.See file dsdata.pdf to determine how the superseded data were derived.
 HV2046
 HV2046_MARKER: DD = SURVEY DISK
 HV2046_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV2046_SP_SET: FOUNDATION
 HV2046_STAMPING: 317
 HV2046_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV2046
 HV2046  HISTORY     - Date     Condition        Report By
 HV2046  HISTORY     - UNK      MONUMENTED       PBPP
 HV2046  HISTORY     - 1944     GOOD             CGS
 HV2046  HISTORY     - 1944     GOOD             CGS
 HV2046
 HV2046                          STATION DESCRIPTION
 HV2046
 HV2046'DESCRIBED BY COAST AND GEODETIC SURVEY 1944
 HV2046'IN WASHINGTON.
 HV2046'IN SOUTHEAST WASHINGTON, AT THE NAVAL AIR STATION, 300 FEET
 HV2046'EAST OF ANACOSTIA RIVER, AT THE NORTHWEST CORNER OF THE PARKING
 HV2046'LOT SOUTH OF THE ADMINISTRATION BUILDING, IN THE NORTH WALL OF
 HV2046'AN OLD FOUNDATION (THE BUILDING HAS BEEN TORN DOWN AND ONLY
 HV2046'THE FOUNDATION IS LEFT), 7 INCHES EAST OF THE NORTHWEST CORNER,
 HV2046'AND ABOUT 1 FOOT ABOVE THE CONCRETE SIDEWALK.  A PUBLIC BUILDINGS
 HV2046'AND PUBLIC PARKS STANDARD DISK, STAMPED 317 AND SET VERTICALLY.
 HV2046
 HV2046                          STATION RECOVERY (1944)
 HV2046
 HV2046'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV2046'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2045 ***********************************************************************
 HV2045  DESIGNATION -  318 PBPP
 HV2045  PID         -  HV2045
 HV2045  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2045  COUNTRY     -  US
 HV2045  USGS QUAD   -  ANACOSTIA (2016)
 HV2045
 HV2045                         *CURRENT SURVEY CONTROL
 HV2045  ______________________________________________________________________
 HV2045* NAD 83(1986) POSITION- 38 51 50.     (N) 076 59 57.     (W)   SCALED
 HV2045* NAVD 88 ORTHO HEIGHT -     2.359 (meters)        7.74  (feet) ADJUSTED
 HV2045  ______________________________________________________________________
 HV2045  GEOID HEIGHT    -        -32.191 (meters)                     GEOID18
 HV2045  DYNAMIC HEIGHT  -          2.357 (meters)        7.73  (feet) COMP
 HV2045  MODELED GRAVITY -    980,094.1   (mgal)                       NAVD 88
 HV2045
 HV2045  VERT ORDER      -  FIRST     CLASS II
 HV2045
 HV2045.The horizontal coordinates were scaled from a map and have
 HV2045.an estimated accuracy of +/- 6 seconds.
 HV2045
 HV2045.The orthometric height was determined by differential leveling and
 HV2045.adjusted by the NATIONAL GEODETIC SURVEY
 HV2045.in June 1991.
 HV2045
 HV2045.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2045.GEOID18 height accuracy estimate available here.
 HV2045
 HV2045.Click photographs - Photos may exist for this station.
 HV2045
 HV2045.The dynamic height is computed by dividing the NAVD 88
 HV2045.geopotential number by the normal gravity value computed on the
 HV2045.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2045.degrees latitude (g = 980.6199 gals.).
 HV2045
 HV2045.The modeled gravity was interpolated from observed gravity values.
 HV2045
 HV2045
 HV2045_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ265035(NAD 83)
 HV2045
 HV2045                          SUPERSEDED SURVEY CONTROL
 HV2045
 HV2045  NGVD 29 (??/??/92)    2.62   (m)            8.6    (f) COMPUTED    1 2
 HV2045
 HV2045.Superseded values are not recommended for survey control.
 HV2045
 HV2045.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2045.See file dsdata.pdf to determine how the superseded data were derived.
 HV2045
 HV2045_MARKER: DD = SURVEY DISK
 HV2045_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV2045_SP_SET: BUILDING
 HV2045_STAMPING: 318
 HV2045_MARK LOGO: PBPP
 HV2045_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV2045_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV2045+SATELLITE: SATELLITE OBSERVATIONS - April 17, 2013
 HV2045
 HV2045  HISTORY     - Date     Condition        Report By
 HV2045  HISTORY     - UNK      MONUMENTED       PBPP
 HV2045  HISTORY     - 1944     GOOD             CGS
 HV2045  HISTORY     - 20030705 GOOD             GEOCAC
 HV2045  HISTORY     - 20130417 GOOD             GEOMET
 HV2045
 HV2045                          STATION DESCRIPTION
 HV2045
 HV2045'DESCRIBED BY COAST AND GEODETIC SURVEY 1944
 HV2045'IN WASHINGTON.
 HV2045'IN SOUTHEAST WASHINGTON, AT THE POPLAR POINT PUMPING STATION,
 HV2045'IN THE NORTH WALL OF THE SOUTH WING, 14 INCHES EAST OF THE
 HV2045'NORTHWEST CORNER, AND ABOUT 20 INCHES ABOVE THE MACADAM DRIVEWAY.
 HV2045'A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED
 HV2045'318 AND SET VERTICALLY.
 HV2045
 HV2045                          STATION RECOVERY (2003)
 HV2045
 HV2045'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV2045'DISK IS PAINTED OVER AND STAMPING COULD NOT BE VERIFIED.
 HV2045
 HV2045                          STATION RECOVERY (2013)
 HV2045
 HV2045'RECOVERY NOTE BY GEOMETRICS GPS INCORPORATED 2013 (DWB)
 HV2045'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1326 ***********************************************************************
 HV1326  DESIGNATION -  319
 HV1326  PID         -  HV1326
 HV1326  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1326  COUNTRY     -  US
 HV1326  USGS QUAD   -  ANACOSTIA (2016)
 HV1326
 HV1326                         *CURRENT SURVEY CONTROL
 HV1326  ______________________________________________________________________
 HV1326* NAD 83(1986) POSITION- 38 52 07.8    (N) 076 59 49.3    (W)   HD_HELD2
 HV1326* NAVD 88 ORTHO HEIGHT -     3.193 (meters)       10.48  (feet) ADJUSTED
 HV1326  ______________________________________________________________________
 HV1326  GEOID HEIGHT    -        -32.188 (meters)                     GEOID18
 HV1326  DYNAMIC HEIGHT  -          3.192 (meters)       10.47  (feet) COMP
 HV1326  MODELED GRAVITY -    980,095.0   (mgal)                       NAVD 88
 HV1326
 HV1326  VERT ORDER      -  SECOND    CLASS I
 HV1326
 HV1326.The horizontal coordinates were established by autonomous hand held GPS
 HV1326.observations and have an estimated accuracy of +/- 10 meters.
 HV1326
 HV1326.The orthometric height was determined by differential leveling and
 HV1326.adjusted by the NATIONAL GEODETIC SURVEY
 HV1326.in October 2001.
 HV1326
 HV1326.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1326.GEOID18 height accuracy estimate available here.
 HV1326
 HV1326.Click photographs - Photos may exist for this station.
 HV1326
 HV1326.The dynamic height is computed by dividing the NAVD 88
 HV1326.geopotential number by the normal gravity value computed on the
 HV1326.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1326.degrees latitude (g = 980.6199 gals.).
 HV1326
 HV1326.The modeled gravity was interpolated from observed gravity values.
 HV1326
 HV1326
 HV1326_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2674704116(NAD 83)
 HV1326
 HV1326                          SUPERSEDED SURVEY CONTROL
 HV1326
 HV1326  NAVD 88 (06/15/91)    3.253  (m)           10.67   (f) SUPERSEDED  1 2
 HV1326  NGVD 29 (11/26/84)    3.494  (m)           11.46   (f) ADJUSTED    1 2
 HV1326
 HV1326.Superseded values are not recommended for survey control.
 HV1326
 HV1326.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1326.See file dsdata.pdf to determine how the superseded data were derived.
 HV1326
 HV1326_MARKER: DD = SURVEY DISK
 HV1326_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1326_SP_SET: BRIDGE HEADWALL
 HV1326_STAMPING: 319
 HV1326_MARK LOGO: PBPP
 HV1326_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1326_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1326
 HV1326  HISTORY     - Date     Condition        Report By
 HV1326  HISTORY     - UNK      MONUMENTED       PBPP
 HV1326  HISTORY     - 1942     GOOD             CGS
 HV1326  HISTORY     - 1960     GOOD             CGS
 HV1326  HISTORY     - 20010723 GOOD             NGS
 HV1326  HISTORY     - 20050409 GOOD             GEOCAC
 HV1326
 HV1326                          STATION DESCRIPTION
 HV1326
 HV1326'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1326'IN WASHINGTON.
 HV1326'IN SOUTHEAST WASHINGTON, IN ANACOSTIA PARK, OPPOSITE THE NAVAL
 HV1326'GUN FACTORY, AT THE THIRD SEWER OUTLET SOUTHWEST OF THE ELEVENTH
 HV1326'STREET BRIDGE, IN THE TOP OF THE EAST CORNER OF THE CONCRETE
 HV1326'HEADWALL, 11 INCHES NORTHWEST OF THE SOUTHEAST COPING, AND 10
 HV1326'INCHES SOUTHWEST OF THE NORTHEAST COPING.  A PUBLIC BUILDINGS
 HV1326'AND PUBLIC PARKS STANDARD DISK, STAMPED 319.
 HV1326
 HV1326                          STATION RECOVERY (1960)
 HV1326
 HV1326'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1326'RECOVERED IN GOOD CONDITION.
 HV1326
 HV1326                          STATION RECOVERY (2001)
 HV1326
 HV1326'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 HV1326'RECOVERED AS DESCRIBED.
 HV1326
 HV1326                          STATION RECOVERY (2005)
 HV1326
 HV1326'RECOVERY NOTE BY GEOCACHING 2005 (TAK)
 HV1326'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1725 ***********************************************************************
 HV1725  DESIGNATION -  320=PYLON
 HV1725  PID         -  HV1725
 HV1725  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1725  COUNTRY     -  US
 HV1725  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1725
 HV1725                         *CURRENT SURVEY CONTROL
 HV1725  ______________________________________________________________________
 HV1725* NAD 83(1986) POSITION- 38 53 10.     (N) 077 03 32.     (W)   SCALED
 HV1725* NAVD 88 ORTHO HEIGHT -    10.983 (meters)       36.03  (feet) ADJUSTED
 HV1725  ______________________________________________________________________
 HV1725  GEOID HEIGHT    -        -32.063 (meters)                     GEOID18
 HV1725  DYNAMIC HEIGHT  -         10.977 (meters)       36.01  (feet) COMP
 HV1725  MODELED GRAVITY -    980,094.6   (mgal)                       NAVD 88
 HV1725
 HV1725  VERT ORDER      -  FIRST     CLASS II
 HV1725
 HV1725.The horizontal coordinates were scaled from a map and have
 HV1725.an estimated accuracy of +/- 6 seconds.
 HV1725
 HV1725.The orthometric height was determined by differential leveling and
 HV1725.adjusted by the NATIONAL GEODETIC SURVEY
 HV1725.in June 1991.
 HV1725
 HV1725.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1725.GEOID18 height accuracy estimate available here.
 HV1725
 HV1725.Click photographs - Photos may exist for this station.
 HV1725
 HV1725.The dynamic height is computed by dividing the NAVD 88
 HV1725.geopotential number by the normal gravity value computed on the
 HV1725.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1725.degrees latitude (g = 980.6199 gals.).
 HV1725
 HV1725.The modeled gravity was interpolated from observed gravity values.
 HV1725
 HV1725
 HV1725_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ214061(NAD 83)
 HV1725
 HV1725                          SUPERSEDED SURVEY CONTROL
 HV1725
 HV1725  NGVD 29 (08/12/92)   11.222  (m)           36.82   (f) ADJUSTED    1 2
 HV1725  NGVD 29 (??/??/87)   11.227  (m)           36.83   (f) SUPERSEDED  1 2
 HV1725
 HV1725.Superseded values are not recommended for survey control.
 HV1725
 HV1725.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1725.See file dsdata.pdf to determine how the superseded data were derived.
 HV1725
 HV1725_MARKER: X = CHISELED CROSS
 HV1725_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1725_SP_SET: PYLON
 HV1725_MARK LOGO: NONE
 HV1725_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1725_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1725_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1725+SATELLITE: SATELLITE OBSERVATIONS - May 12, 1992
 HV1725
 HV1725  HISTORY     - Date     Condition        Report By
 HV1725  HISTORY     - UNK      MONUMENTED       PBPP
 HV1725  HISTORY     - 1946     GOOD             CGS
 HV1725  HISTORY     - 1946     GOOD             CGS
 HV1725  HISTORY     - 19920512 GOOD             NGS
 HV1725  HISTORY     - 20090319 MARK NOT FOUND   GEOCAC
 HV1725
 HV1725                          STATION DESCRIPTION
 HV1725
 HV1725'DESCRIBED BY COAST AND GEODETIC SURVEY 1946
 HV1725'1.3 MI SE FROM ROSSLYN.
 HV1725'1.3 MILES SOUTHEAST ALONG POTOMAC RIVER FROM THE FRANCIS SCOTT
 HV1725'KEY BRIDGE AT ROSSLYN, ARLINGTON COUNTY, AT THE SOUTHWEST END
 HV1725'OF ARLINGTON MEMORIAL BRIDGE, AT THE WEST-BANK PYLON OF THE
 HV1725'BOUNDARY CHANNEL BRIDGE, ON THE DOWNSTREAM SIDE, AND ON THE WEST
 HV1725'CORNER OF THE FIRST STONE ABOVE THE SIDEWALK.  A CHISELED CROSS.
 HV1725
 HV1725                          STATION RECOVERY (1946)
 HV1725
 HV1725'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946
 HV1725'RECOVERED IN GOOD CONDITION.
 HV1725
 HV1725                          STATION RECOVERY (1992)
 HV1725
 HV1725'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1725'IN ARLINGTON, AT THE ARLINGTON NATIONAL CEMETERY, A CHISELED CROSS IN
 HV1725'THE NORTHWEST CORNER OF THE 1ST STONE ABOVE THE SIDEWALK OF THE
 HV1725'SOUTHWEST STONE PYLON OF THE ARLINGTON NATIONAL CEMETERY MAIN
 HV1725'ENTRANCE ROAD SPANNING THE BOUNDARY CHANNEL, 0.3 KM (0.20 MI)
 HV1725'SOUTHWEST OF THE SOUTHWEST END OF THE MEMORIAL BRIDGE, 26.1 M
 HV1725'(85.6 FT) SOUTHEAST OF THE CENTER OF THE ENTRANCE ROAD, AND 0.05 M
 HV1725'(0.16 FT) ABOVE THE LEVEL OF THE SIDEWALK.
 HV1725
 HV1725                          STATION RECOVERY (2009)
 HV1725
 HV1725'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV1725'SEARCHED ALL OVER THE BASE OF THE PYLON, BUT COULD NOT SEE OR FEEL A
 HV1725'CHISELED CROSS ANYWHERE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1699 ***********************************************************************
 HV1699  DESIGNATION -  327
 HV1699  PID         -  HV1699
 HV1699  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1699  COUNTRY     -  US
 HV1699  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1699
 HV1699                         *CURRENT SURVEY CONTROL
 HV1699  ______________________________________________________________________
 HV1699* NAD 83(1986) POSITION- 38 53 28.5    (N) 077 03 43.6    (W)   HD_HELD2
 HV1699* NAVD 88 ORTHO HEIGHT -     1.91  (+/-2cm)        6.3   (feet) VERTCON3
 HV1699  ______________________________________________________________________
 HV1699  GEOID HEIGHT    -        -32.050 (meters)                     GEOID18
 HV1699  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1699
 HV1699.The horizontal coordinates were established by autonomous hand held GPS
 HV1699.observations and have an estimated accuracy of +/- 10 meters.
 HV1699
 HV1699.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1699.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1699
 HV1699.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1699.GEOID18 height accuracy estimate available here.
 HV1699
 HV1699.The vertical order pertains to the NGVD 29 superseded value.
 HV1699
 HV1699.Click photographs - Photos may exist for this station.
 HV1699
 HV1699
 HV1699_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2115606729(NAD 83)
 HV1699
 HV1699                          SUPERSEDED SURVEY CONTROL
 HV1699
 HV1699  NGVD 29 (11/26/84)    2.146  (m)            7.04   (f) ADJUSTED    1 2
 HV1699
 HV1699.Superseded values are not recommended for survey control.
 HV1699
 HV1699.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1699.See file dsdata.pdf to determine how the superseded data were derived.
 HV1699
 HV1699_MARKER: DD = SURVEY DISK
 HV1699_SETTING: 66 = SET IN ROCK OUTCROP
 HV1699_STAMPING: 327 1932
 HV1699_MARK LOGO: PBPP
 HV1699_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 HV1699+STABILITY: POSITION/ELEVATION WELL
 HV1699
 HV1699  HISTORY     - Date     Condition        Report By
 HV1699  HISTORY     - 1932     MONUMENTED       PBPP
 HV1699  HISTORY     - 1935     GOOD             CGS
 HV1699  HISTORY     - 1946     GOOD             CGS
 HV1699
 HV1699                          STATION DESCRIPTION
 HV1699
 HV1699'DESCRIBED BY COAST AND GEODETIC SURVEY 1935
 HV1699'AT ANALOSTAN ISLAND.
 HV1699'SET IN TOP OF LARGE ROCK OUTCROP WHICH IS ON THE WEST SIDE
 HV1699'OF ANALOSTAN ISLAND AND FACING LITTLE RIVER, APPROX. 350 FT
 HV1699'NORTH FROM THE NORTH END OF COLUMBIA ISLAND, 150 FT SOUTH FROM
 HV1699'LINE OF PILING WHICH ARE THE REMAINS OF OLD CAUSEWAY CONNECTING
 HV1699'THE ISLAND WITH THE VIRGINIA SHORE.
 HV1699
 HV1699                          STATION RECOVERY (1946)
 HV1699
 HV1699'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946
 HV1699'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1329 ***********************************************************************
 HV1329  DESIGNATION -  328
 HV1329  PID         -  HV1329
 HV1329  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1329  COUNTRY     -  US
 HV1329  USGS QUAD   -  ANACOSTIA (2016)
 HV1329
 HV1329                         *CURRENT SURVEY CONTROL
 HV1329  ______________________________________________________________________
 HV1329* NAD 83(1986) POSITION- 38 50 54.     (N) 076 59 46.     (W)   SCALED
 HV1329* NAVD 88 ORTHO HEIGHT -    53.241 (meters)      174.67  (feet) ADJUSTED
 HV1329  ______________________________________________________________________
 HV1329  GEOID HEIGHT    -        -32.216 (meters)                     GEOID18
 HV1329  DYNAMIC HEIGHT  -         53.212 (meters)      174.58  (feet) COMP
 HV1329  MODELED GRAVITY -    980,090.1   (mgal)                       NAVD 88
 HV1329
 HV1329  VERT ORDER      -  FIRST     CLASS II
 HV1329
 HV1329.The horizontal coordinates were scaled from a map and have
 HV1329.an estimated accuracy of +/- 6 seconds.
 HV1329
 HV1329.The orthometric height was determined by differential leveling and
 HV1329.adjusted by the NATIONAL GEODETIC SURVEY
 HV1329.in June 1991.
 HV1329
 HV1329.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1329.GEOID18 height accuracy estimate available here.
 HV1329
 HV1329.Click photographs - Photos may exist for this station.
 HV1329
 HV1329.The dynamic height is computed by dividing the NAVD 88
 HV1329.geopotential number by the normal gravity value computed on the
 HV1329.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1329.degrees latitude (g = 980.6199 gals.).
 HV1329
 HV1329.The modeled gravity was interpolated from observed gravity values.
 HV1329
 HV1329
 HV1329_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ267018(NAD 83)
 HV1329
 HV1329                          SUPERSEDED SURVEY CONTROL
 HV1329
 HV1329  NGVD 29 (11/26/84)   53.481  (m)          175.46   (f) ADJUSTED    1 2
 HV1329
 HV1329.Superseded values are not recommended for survey control.
 HV1329
 HV1329.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1329.See file dsdata.pdf to determine how the superseded data were derived.
 HV1329
 HV1329_MARKER: Z = SEE DESCRIPTION
 HV1329_SETTING: 9 = POST (STONE OR PRECAST CONCRETE)
 HV1329_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1329
 HV1329  HISTORY     - Date     Condition        Report By
 HV1329  HISTORY     - 1931     MONUMENTED       PBPP
 HV1329  HISTORY     - 1942     GOOD             CGS
 HV1329  HISTORY     - 1954     GOOD             CGS
 HV1329
 HV1329                          STATION DESCRIPTION
 HV1329
 HV1329'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1329'IN WASHINGTON.
 HV1329'IN SOUTHEAST WASHINGTON, ON NICHOLS AVENUE SOUTHEAST, 120 FEET
 HV1329'NORTH OF MILWAUKEE PLACE, AT ST. ELIZABETHS HOSPITAL, AT THE
 HV1329'SOUTHEAST CORNER OF THE STONE WALL AROUND THE GROUNDS, 9.5
 HV1329'FEET SOUTH OF THE CORNER, 10.5 FEET WEST OF THE WEST CURB OF
 HV1329'NICHOLS AVENUE, ON A GRANITE PROPERTY-CORNER POST MARKED U.S.
 HV1329'ON THE NORTH SIDE, 2.5 INCHES NORTH OF THE SOUTH EDGE OF THE
 HV1329'STONE, 1.5 INCHES WEST OF THE EAST EDGE, AND ABOUT 1 FOOT
 HV1329'ABOVE THE SIDEWALK.  THE HIGHEST POINT ON THE PROPERTY CORNER.
 HV1329
 HV1329                          STATION RECOVERY (1954)
 HV1329
 HV1329'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1954
 HV1329'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ5411 ***********************************************************************
 AJ5411  DESIGNATION -  33
 AJ5411  PID         -  AJ5411
 AJ5411  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ5411  COUNTRY     -  US
 AJ5411  USGS QUAD   -  ANACOSTIA (2016)
 AJ5411
 AJ5411                         *CURRENT SURVEY CONTROL
 AJ5411  ______________________________________________________________________
 AJ5411* NAD 83(1986) POSITION- 38 52 27.     (N) 076 59 56.     (W)   SCALED
 AJ5411* NAVD 88 ORTHO HEIGHT -     2.205 (meters)        7.23  (feet) ADJUSTED
 AJ5411  ______________________________________________________________________
 AJ5411  GEOID HEIGHT    -        -32.175 (meters)                     GEOID18
 AJ5411  DYNAMIC HEIGHT  -          2.204 (meters)        7.23  (feet) COMP
 AJ5411  MODELED GRAVITY -    980,096.7   (mgal)                       NAVD 88
 AJ5411
 AJ5411  VERT ORDER      -  SECOND    CLASS I
 AJ5411
 AJ5411.The horizontal coordinates were scaled from a map and have
 AJ5411.an estimated accuracy of +/- 6 seconds.
 AJ5411
 AJ5411.The orthometric height was determined by differential leveling and
 AJ5411.adjusted by the NATIONAL GEODETIC SURVEY
 AJ5411.in October 2001.
 AJ5411
 AJ5411.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ5411.GEOID18 height accuracy estimate available here.
 AJ5411
 AJ5411.Click photographs - Photos may exist for this station.
 AJ5411
 AJ5411.The dynamic height is computed by dividing the NAVD 88
 AJ5411.geopotential number by the normal gravity value computed on the
 AJ5411.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ5411.degrees latitude (g = 980.6199 gals.).
 AJ5411
 AJ5411.The modeled gravity was interpolated from observed gravity values.
 AJ5411
 AJ5411
 AJ5411_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ265047(NAD 83)
 AJ5411
 AJ5411                          SUPERSEDED SURVEY CONTROL
 AJ5411
 AJ5411.No superseded survey control is available for this station.
 AJ5411
 AJ5411_MARKER: DD = SURVEY DISK
 AJ5411_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 AJ5411_SP_SET: DOOR SILL
 AJ5411_STAMPING: NO 33 1940 12.524
 AJ5411_MARK LOGO: WASNAV
 AJ5411_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ5411_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 AJ5411
 AJ5411  HISTORY     - Date     Condition        Report By
 AJ5411  HISTORY     - 1940     MONUMENTED       WASNAV
 AJ5411  HISTORY     - 20010806 GOOD             NGS
 AJ5411
 AJ5411                          STATION DESCRIPTION
 AJ5411
 AJ5411'DESCRIBED BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 AJ5411'IN WASHINGTON DC AT THE WASHINGTON NAVY YARD AT BUILDING NUMBER 33
 AJ5411'(NAVAL FACILITIES ENGINEERING COMMAND) ON PATTERSON STREET (ONE WAY
 AJ5411'NORTH) , IN THE NORTHEAST CORNER OF A DOOR SILL, 25.0 FEET (7.6 M)
 AJ5411'SOSUTHEAST OF THE CENTER OF 3 LANES (ONE WAY) OF PATTERSON STREET, 9.6
 AJ5411'FEET (2.9 M) SOUTHEAST OF CURB FOR PATTERSON STREET, 25.4 FEET (7.7 M)
 AJ5411'NORTHEAST OF NORTHEAST CORNER OF MAIN ENTRANCE TO BUILDING NUMBER 33
 AJ5411'(FACILITIES COMMAND) , 20.6 FEET (6.3 M) SOUTH OF A MONITORING WELL
 AJ5411'ENGRAVED ON A ROUND STEEL COVER WITH 2 BOLTS, AND 0.3 FEET (9.1 CM)
 AJ5411'EAST-SOUTHEAST OF EDGE OF SIDEWALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1967 ***********************************************************************
 HV1967  DESIGNATION -  331 PBPP
 HV1967  PID         -  HV1967
 HV1967  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1967  COUNTRY     -  US
 HV1967  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1967
 HV1967                         *CURRENT SURVEY CONTROL
 HV1967  ______________________________________________________________________
 HV1967* NAD 83(1986) POSITION- 38 55 47.     (N) 077 06 26.     (W)   SCALED
 HV1967* NAVD 88 ORTHO HEIGHT -    47.008 (meters)      154.23  (feet) ADJUSTED
 HV1967  ______________________________________________________________________
 HV1967  GEOID HEIGHT    -        -31.928 (meters)                     GEOID18
 HV1967  DYNAMIC HEIGHT  -         46.982 (meters)      154.14  (feet) COMP
 HV1967  MODELED GRAVITY -    980,091.0   (mgal)                       NAVD 88
 HV1967
 HV1967  VERT ORDER      -  FIRST     CLASS II
 HV1967
 HV1967.The horizontal coordinates were scaled from a map and have
 HV1967.an estimated accuracy of +/- 6 seconds.
 HV1967
 HV1967.The orthometric height was determined by differential leveling and
 HV1967.adjusted by the NATIONAL GEODETIC SURVEY
 HV1967.in June 1991.
 HV1967
 HV1967.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1967.GEOID18 height accuracy estimate available here.
 HV1967
 HV1967.Click photographs - Photos may exist for this station.
 HV1967
 HV1967.The dynamic height is computed by dividing the NAVD 88
 HV1967.geopotential number by the normal gravity value computed on the
 HV1967.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1967.degrees latitude (g = 980.6199 gals.).
 HV1967
 HV1967.The modeled gravity was interpolated from observed gravity values.
 HV1967
 HV1967
 HV1967_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ173110(NAD 83)
 HV1967
 HV1967                          SUPERSEDED SURVEY CONTROL
 HV1967
 HV1967  NGVD 29 (11/26/84)   47.236  (m)          154.97   (f) ADJUSTED    1 2
 HV1967
 HV1967.Superseded values are not recommended for survey control.
 HV1967
 HV1967.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1967.See file dsdata.pdf to determine how the superseded data were derived.
 HV1967
 HV1967_MARKER: DD = SURVEY DISK
 HV1967_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1967_SP_SET: BUILDING
 HV1967_STAMPING: 331
 HV1967_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1967
 HV1967  HISTORY     - Date     Condition        Report By
 HV1967  HISTORY     - UNK      MONUMENTED       PBPP
 HV1967  HISTORY     - 1931     GOOD             PBPP
 HV1967  HISTORY     - 1960     GOOD             CGS
 HV1967  HISTORY     - 1979     GOOD             NGS
 HV1967
 HV1967                          STATION DESCRIPTION
 HV1967
 HV1967'DESCRIBED BY PUB BLDGS AND PARKS 1931
 HV1967'AT WASHINGTON.
 HV1967'AT WASHINGTON, ON THE EAST SIDE OF MACARTHUR BOULEVARD NORTHWEST,
 HV1967'150 FEET SOUTH OF THE INTERSECTION OF CATHEDRAL AVENUE, AT A STORE
 HV1967'BUILDING (OCCUPIED IN 1926 BY AN ATLANTIC AND PACIFIC STORE, AND
 HV1967'IN 1943 BY THE HIGH CO. DAIRY), IN THE SOUTH WALL OF THE BUILDING,
 HV1967'1.4 FEET EAST OF THE SOUTHWEST CORNER, AND 2.2 FEET ABOVE THE
 HV1967'GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK,
 HV1967'STAMPED 331 AND SET VERTICALLY.
 HV1967
 HV1967                          STATION RECOVERY (1960)
 HV1967
 HV1967'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1967'RECOVERED IN GOOD CONDITION.
 HV1967
 HV1967                          STATION RECOVERY (1979)
 HV1967
 HV1967'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1967'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1226 ***********************************************************************
 HV1226  DESIGNATION -  343 107
 HV1226  PID         -  HV1226
 HV1226  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1226  COUNTRY     -  US
 HV1226  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1226
 HV1226                         *CURRENT SURVEY CONTROL
 HV1226  ______________________________________________________________________
 HV1226* NAD 83(1986) POSITION- 38 53 51.     (N) 076 58 08.     (W)   SCALED
 HV1226* NAVD 88 ORTHO HEIGHT -     6.012 (meters)       19.72  (feet) ADJUSTED
 HV1226  ______________________________________________________________________
 HV1226  GEOID HEIGHT    -        -32.192 (meters)                     GEOID18
 HV1226  DYNAMIC HEIGHT  -          6.009 (meters)       19.71  (feet) COMP
 HV1226  MODELED GRAVITY -    980,098.0   (mgal)                       NAVD 88
 HV1226
 HV1226  VERT ORDER      -  FIRST     CLASS II
 HV1226
 HV1226.The horizontal coordinates were scaled from a map and have
 HV1226.an estimated accuracy of +/- 6 seconds.
 HV1226
 HV1226.The orthometric height was determined by differential leveling and
 HV1226.adjusted by the NATIONAL GEODETIC SURVEY
 HV1226.in June 1991.
 HV1226
 HV1226.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1226.GEOID18 height accuracy estimate available here.
 HV1226
 HV1226.Click photographs - Photos may exist for this station.
 HV1226
 HV1226.The dynamic height is computed by dividing the NAVD 88
 HV1226.geopotential number by the normal gravity value computed on the
 HV1226.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1226.degrees latitude (g = 980.6199 gals.).
 HV1226
 HV1226.The modeled gravity was interpolated from observed gravity values.
 HV1226
 HV1226
 HV1226_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ292072(NAD 83)
 HV1226
 HV1226                          SUPERSEDED SURVEY CONTROL
 HV1226
 HV1226  NGVD 29 (11/26/84)    6.247  (m)           20.50   (f) ADJUSTED    1 2
 HV1226
 HV1226.Superseded values are not recommended for survey control.
 HV1226
 HV1226.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1226.See file dsdata.pdf to determine how the superseded data were derived.
 HV1226
 HV1226_MARKER: DD = SURVEY DISK
 HV1226_SETTING: 21 = SET IN CONCRETE IN A CLAY TILE PIPE
 HV1226_STAMPING: 343-107
 HV1226_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1226
 HV1226  HISTORY     - Date     Condition        Report By
 HV1226  HISTORY     - UNK      MONUMENTED       PBPP
 HV1226  HISTORY     - 1929     GOOD             CGS
 HV1226  HISTORY     - 1960     MARK NOT FOUND   CGS
 HV1226
 HV1226                          STATION DESCRIPTION
 HV1226
 HV1226'DESCRIBED BY COAST AND GEODETIC SURVEY 1929
 HV1226'AT WASHINGTON.
 HV1226'AT WASHINGTON, ON BENNING ROAD NORTHEAST, IN THE SOUTHEAST
 HV1226'QUADRANT OF THE INTERSECTION OF OKLAHOMA AVENUE NORTHEAST,
 HV1226'181 FEET EAST OF THE EAST CURB OF OKLAHOMA AVENUE, 14 FEET
 HV1226'SOUTH OF THE SOUTH CURB OF BENNING ROAD, 21.4 FEET NORTHEAST
 HV1226'OF BENCH MARK 732 (U.S.E.) DESCRIBED ABOVE, 19.7 FEET SOUTHEAST
 HV1226'OF POWER POLE 530346, AND 2 FEET SOUTH OF THE SOUTH EDGE OF A
 HV1226'SIDEWALK.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK,
 HV1226'STAMPED 343-107 AND SET IN THE TOP OF A 4-INCH CONCRETE-FILLED
 HV1226'TILE PIPE.
 HV1226
 HV1226                          STATION RECOVERY (1960)
 HV1226
 HV1226'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1226'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1908 ***********************************************************************
 HV1908  DESIGNATION -  4
 HV1908  PID         -  HV1908
 HV1908  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1908  COUNTRY     -  US
 HV1908  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1908
 HV1908                         *CURRENT SURVEY CONTROL
 HV1908  ______________________________________________________________________
 HV1908* NAD 83(1986) POSITION- 38 56 32.     (N) 077 03 58.     (W)   SCALED
 HV1908* NAVD 88 ORTHO HEIGHT -   104.088 (meters)      341.50  (feet) ADJUSTED
 HV1908  ______________________________________________________________________
 HV1908  GEOID HEIGHT    -        -31.963 (meters)                     GEOID18
 HV1908  DYNAMIC HEIGHT  -        104.032 (meters)      341.31  (feet) COMP
 HV1908  MODELED GRAVITY -    980,083.0   (mgal)                       NAVD 88
 HV1908
 HV1908  VERT ORDER      -  SECOND    CLASS 0
 HV1908
 HV1908.The horizontal coordinates were scaled from a map and have
 HV1908.an estimated accuracy of +/- 6 seconds.
 HV1908
 HV1908.The orthometric height was determined by differential leveling and
 HV1908.adjusted by the NATIONAL GEODETIC SURVEY
 HV1908.in June 1991.
 HV1908
 HV1908.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1908.GEOID18 height accuracy estimate available here.
 HV1908
 HV1908.Click photographs - Photos may exist for this station.
 HV1908
 HV1908.The dynamic height is computed by dividing the NAVD 88
 HV1908.geopotential number by the normal gravity value computed on the
 HV1908.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1908.degrees latitude (g = 980.6199 gals.).
 HV1908
 HV1908.The modeled gravity was interpolated from observed gravity values.
 HV1908
 HV1908
 HV1908_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ209123(NAD 83)
 HV1908
 HV1908                          SUPERSEDED SURVEY CONTROL
 HV1908
 HV1908  NGVD 29 (11/26/84)  104.320  (m)          342.26   (f) ADJUSTED    2 0
 HV1908
 HV1908.Superseded values are not recommended for survey control.
 HV1908
 HV1908.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1908.See file dsdata.pdf to determine how the superseded data were derived.
 HV1908
 HV1908_MARKER: X = CHISELED CROSS
 HV1908_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1908_SP_SET: STEP
 HV1908_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1908
 HV1908  HISTORY     - Date     Condition        Report By
 HV1908  HISTORY     - UNK      MONUMENTED       CGS
 HV1908  HISTORY     - 1928     GOOD             CGS
 HV1908  HISTORY     - 1932     GOOD             CGS
 HV1908
 HV1908                          STATION DESCRIPTION
 HV1908
 HV1908'DESCRIBED BY COAST AND GEODETIC SURVEY 1928
 HV1908'IN WASHINGTON.
 HV1908'IN NORTHWEST WASHINGTON, AT THE NATIONAL BUREAU OF STANDARDS,
 HV1908'AT THE SOUTH ENTRANCE TO THE NORTHWEST BUILDING, AND ON THE
 HV1908'RIGHT SIDE OF THE TOP STEP.  A CHISELED CROSS.
 HV1908
 HV1908                          STATION RECOVERY (1932)
 HV1908
 HV1908'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1932
 HV1908'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1384 ***********************************************************************
 HV1384  DESIGNATION -  4 WNY
 HV1384  PID         -  HV1384
 HV1384  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1384  COUNTRY     -  US
 HV1384  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1384
 HV1384                         *CURRENT SURVEY CONTROL
 HV1384  ______________________________________________________________________
 HV1384* NAD 83(1986) POSITION- 38 52 34.     (N) 076 59 53.     (W)   SCALED
 HV1384* NAVD 88 ORTHO HEIGHT -     2.197 (meters)        7.21  (feet) ADJUSTED
 HV1384  ______________________________________________________________________
 HV1384  GEOID HEIGHT    -        -32.173 (meters)                     GEOID18
 HV1384  DYNAMIC HEIGHT  -          2.196 (meters)        7.20  (feet) COMP
 HV1384  MODELED GRAVITY -    980,097.2   (mgal)                       NAVD 88
 HV1384
 HV1384  VERT ORDER      -  FIRST     CLASS II
 HV1384
 HV1384.The horizontal coordinates were scaled from a map and have
 HV1384.an estimated accuracy of +/- 6 seconds.
 HV1384
 HV1384.The orthometric height was determined by differential leveling and
 HV1384.adjusted by the NATIONAL GEODETIC SURVEY
 HV1384.in June 1991.
 HV1384
 HV1384.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1384.GEOID18 height accuracy estimate available here.
 HV1384
 HV1384.Click photographs - Photos may exist for this station.
 HV1384
 HV1384.The dynamic height is computed by dividing the NAVD 88
 HV1384.geopotential number by the normal gravity value computed on the
 HV1384.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1384.degrees latitude (g = 980.6199 gals.).
 HV1384
 HV1384.The modeled gravity was interpolated from observed gravity values.
 HV1384
 HV1384
 HV1384_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ266049(NAD 83)
 HV1384
 HV1384                          SUPERSEDED SURVEY CONTROL
 HV1384
 HV1384  NGVD 29 (11/26/84)    2.428  (m)            7.97   (f) ADJUSTED    1 2
 HV1384
 HV1384.Superseded values are not recommended for survey control.
 HV1384
 HV1384.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1384.See file dsdata.pdf to determine how the superseded data were derived.
 HV1384
 HV1384_MARKER: DD = SURVEY DISK
 HV1384_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1384_SP_SET: PAVEMENT
 HV1384_STAMPING: WNY 4
 HV1384_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1384
 HV1384  HISTORY     - Date     Condition        Report By
 HV1384  HISTORY     - UNK      MONUMENTED       USACE
 HV1384  HISTORY     - 1923     GOOD             CGS
 HV1384  HISTORY     - 1955     GOOD             CGS
 HV1384
 HV1384                          STATION DESCRIPTION
 HV1384
 HV1384'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1384'IN WASHINGTON.
 HV1384'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1384'ON ISAAC HULL AVENUE, ON THE EAST SIDE OF BUILDING 113, AT
 HV1384'A LARGE DOORWAY, IN THE PAVEMENT, 1.2 FEET OUT FROM THE DOOR,
 HV1384'AND 3 INCHES SOUTH OF THE NORTH END OF THE DOORWAY.  A WASHINGTON
 HV1384'NAVY YARD STANDARD DISK, STAMPED WNY 4.
 HV1384
 HV1384                          STATION RECOVERY (1955)
 HV1384
 HV1384'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1384'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1333 ***********************************************************************
 HV1333  DESIGNATION -  402=130 A PRR
 HV1333  PID         -  HV1333
 HV1333  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1333  COUNTRY     -  US
 HV1333  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1333
 HV1333                         *CURRENT SURVEY CONTROL
 HV1333  ______________________________________________________________________
 HV1333* NAD 83(1986) POSITION- 38 54 37.     (N) 076 55 55.     (W)   SCALED
 HV1333* NAVD 88 ORTHO HEIGHT -    13.98  (+/-2cm)       45.9   (feet) VERTCON3
 HV1333  ______________________________________________________________________
 HV1333  GEOID HEIGHT    -        -32.252 (meters)                     GEOID18
 HV1333  VERT ORDER      -  SECOND    CLASS 0 (See Below)
 HV1333
 HV1333.The horizontal coordinates were scaled from a map and have
 HV1333.an estimated accuracy of +/- 6 seconds.
 HV1333
 HV1333.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1333.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1333
 HV1333.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1333.GEOID18 height accuracy estimate available here.
 HV1333
 HV1333.The vertical order pertains to the NGVD 29 superseded value.
 HV1333
 HV1333.Click photographs - Photos may exist for this station.
 HV1333
 HV1333
 HV1333_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ324085(NAD 83)
 HV1333
 HV1333                          SUPERSEDED SURVEY CONTROL
 HV1333
 HV1333  NGVD 29 (11/26/84)   14.214  (m)           46.63   (f) ADJUSTED    2 0
 HV1333
 HV1333.Superseded values are not recommended for survey control.
 HV1333
 HV1333.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1333.See file dsdata.pdf to determine how the superseded data were derived.
 HV1333
 HV1333_MARKER: Q = CHISELED SQUARE
 HV1333_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1333_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1333+STABILITY: SURFACE MOTION
 HV1333
 HV1333  HISTORY     - Date     Condition        Report By
 HV1333  HISTORY     - UNK      MONUMENTED       PRR
 HV1333  HISTORY     - 1944     GOOD             WSSC
 HV1333
 HV1333                          STATION DESCRIPTION
 HV1333
 HV1333'DESCRIBED BY WASH SUBURB SAN COMM 1944
 HV1333'AT MD DC LINE.
 HV1333'ON THE PENNSYLVANIA RAILROAD, 0.9 MILE SOUTH OF THE MAGRUDER
 HV1333'AVENUE BRIDGE, ON THE WEST SIDE OF THE TRACKS, AND ON THE
 HV1333'MARYLAND-DISTRICT OF COLUMBIA LINE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1310 ***********************************************************************
 HV1310  DESIGNATION -  405 2 PBPP
 HV1310  PID         -  HV1310
 HV1310  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1310  COUNTRY     -  US
 HV1310  USGS QUAD   -  ANACOSTIA (2016)
 HV1310
 HV1310                         *CURRENT SURVEY CONTROL
 HV1310  ______________________________________________________________________
 HV1310* NAD 83(1986) POSITION- 38 52 17.     (N) 076 56 24.     (W)   SCALED
 HV1310* NAVD 88 ORTHO HEIGHT -    91.92  (+/-2cm)      301.6   (feet) VERTCON3
 HV1310  ______________________________________________________________________
 HV1310  GEOID HEIGHT    -        -32.285 (meters)                     GEOID18
 HV1310  VERT ORDER      -  SECOND    CLASS 0 (See Below)
 HV1310
 HV1310.The horizontal coordinates were scaled from a map and have
 HV1310.an estimated accuracy of +/- 6 seconds.
 HV1310
 HV1310.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1310.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1310
 HV1310.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1310.GEOID18 height accuracy estimate available here.
 HV1310
 HV1310.The vertical order pertains to the NGVD 29 superseded value.
 HV1310
 HV1310.Click photographs - Photos may exist for this station.
 HV1310
 HV1310
 HV1310_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ317042(NAD 83)
 HV1310
 HV1310                          SUPERSEDED SURVEY CONTROL
 HV1310
 HV1310  NGVD 29 (11/26/84)   92.162  (m)          302.37   (f) ADJUSTED    2 0
 HV1310
 HV1310.Superseded values are not recommended for survey control.
 HV1310
 HV1310.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1310.See file dsdata.pdf to determine how the superseded data were derived.
 HV1310
 HV1310_MARKER: DD = SURVEY DISK
 HV1310_SETTING: 0 = UNSPECIFIED SETTING
 HV1310_STAMPING: 405-2
 HV1310_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1310
 HV1310  HISTORY     - Date     Condition        Report By
 HV1310  HISTORY     - UNK      MONUMENTED       PBPP
 HV1310  HISTORY     - 1944     GOOD             WSSC
 HV1310
 HV1310                          STATION DESCRIPTION
 HV1310
 HV1310'DESCRIBED BY WASH SUBURB SAN COMM 1944
 HV1310'IN WASHINGTON.
 HV1310'ON ALABAMA AVENUE, 0.1 MILE EAST OF BOULEVARD AVENUE, ABOUT 300
 HV1310'FEET EAST OF THE ENTRANCE TO FORT DUPONT, 95 FEET NORTH OF THE
 HV1310'CENTERLINE OF ALABAMA AVENUE, 20.3 FEET NORTHWEST OF THE EDGE
 HV1310'OF A HEDGE, AND 13.8 FEET SOUTHWEST OF A 10-INCH OAK TREE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1383 ***********************************************************************
 HV1383  DESIGNATION -  41 WNY
 HV1383  PID         -  HV1383
 HV1383  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1383  COUNTRY     -  US
 HV1383  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1383
 HV1383                         *CURRENT SURVEY CONTROL
 HV1383  ______________________________________________________________________
 HV1383* NAD 83(1986) POSITION- 38 52 32.     (N) 076 59 49.     (W)   SCALED
 HV1383* NAVD 88 ORTHO HEIGHT -     2.90  (+/-2cm)        9.5   (feet) VERTCON3
 HV1383  ______________________________________________________________________
 HV1383  GEOID HEIGHT    -        -32.176 (meters)                     GEOID18
 HV1383  VERT ORDER      -  ? (See Below)
 HV1383
 HV1383.The horizontal coordinates were scaled from a map and have
 HV1383.an estimated accuracy of +/- 6 seconds.
 HV1383
 HV1383.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1383.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1383
 HV1383.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1383.GEOID18 height accuracy estimate available here.
 HV1383
 HV1383.The vertical order pertains to the NGVD 29 superseded value.
 HV1383
 HV1383.Click photographs - Photos may exist for this station.
 HV1383
 HV1383
 HV1383_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ267048(NAD 83)
 HV1383
 HV1383                          SUPERSEDED SURVEY CONTROL
 HV1383
 HV1383  NGVD 29 (11/26/84)    3.142  (m)           10.31   (f) ADJUSTED       
 HV1383
 HV1383.Superseded values are not recommended for survey control.
 HV1383
 HV1383.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1383.See file dsdata.pdf to determine how the superseded data were derived.
 HV1383
 HV1383_MARKER: DD = SURVEY DISK
 HV1383_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1383_SP_SET: BUILDING
 HV1383_STAMPING: NO 41 1940
 HV1383_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1383
 HV1383  HISTORY     - Date     Condition        Report By
 HV1383  HISTORY     - 1940     MONUMENTED       USACE
 HV1383  HISTORY     - 1942     GOOD             CGS
 HV1383  HISTORY     - 19950810 MARK NOT FOUND   USPSQD
 HV1383
 HV1383                          STATION DESCRIPTION
 HV1383
 HV1383'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1383'IN WASHINGTON.
 HV1383'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1383'AT THE NORTH END OF PAULDING STREET, AT THE NORTH END OF
 HV1383'BUILDING 41, AT THE WEST SIDE OF THE BUILDING, 1.4 FEET WEST OF
 HV1383'THE FACE OF THE DOOR, AND 0.3 FOOT SOUTH OF THE NORTH END OF
 HV1383'THE RAILROAD DOORWAY.  A WASHINGTON NAVY YARD STANDARD DISK,
 HV1383'STAMPED NO 41 1940.
 HV1383
 HV1383                          STATION RECOVERY (1995)
 HV1383
 HV1383'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1383'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1988 ***********************************************************************
 HV1988  DESIGNATION -  48
 HV1988  PID         -  HV1988
 HV1988  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1988  COUNTRY     -  US
 HV1988  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1988
 HV1988                         *CURRENT SURVEY CONTROL
 HV1988  ______________________________________________________________________
 HV1988* NAD 83(1986) POSITION- 38 52 59.     (N) 077 01 12.     (W)   SCALED
 HV1988* NAVD 88 ORTHO HEIGHT -     8.570 (meters)       28.12  (feet) ADJUSTED
 HV1988  ______________________________________________________________________
 HV1988  GEOID HEIGHT    -        -32.123 (meters)                     GEOID18
 HV1988  DYNAMIC HEIGHT  -          8.565 (meters)       28.10  (feet) COMP
 HV1988  MODELED GRAVITY -    980,098.8   (mgal)                       NAVD 88
 HV1988
 HV1988  VERT ORDER      -  FIRST     CLASS II
 HV1988
 HV1988.The horizontal coordinates were scaled from a map and have
 HV1988.an estimated accuracy of +/- 6 seconds.
 HV1988
 HV1988.The orthometric height was determined by differential leveling and
 HV1988.adjusted by the NATIONAL GEODETIC SURVEY
 HV1988.in June 1991.
 HV1988
 HV1988.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1988.GEOID18 height accuracy estimate available here.
 HV1988
 HV1988.Click photographs - Photos may exist for this station.
 HV1988
 HV1988.The dynamic height is computed by dividing the NAVD 88
 HV1988.geopotential number by the normal gravity value computed on the
 HV1988.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1988.degrees latitude (g = 980.6199 gals.).
 HV1988
 HV1988.The modeled gravity was interpolated from observed gravity values.
 HV1988
 HV1988
 HV1988_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ247057(NAD 83)
 HV1988
 HV1988                          SUPERSEDED SURVEY CONTROL
 HV1988
 HV1988  NGVD 29 (11/26/84)    8.808  (m)           28.90   (f) ADJUSTED    1 2
 HV1988
 HV1988.Superseded values are not recommended for survey control.
 HV1988
 HV1988.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1988.See file dsdata.pdf to determine how the superseded data were derived.
 HV1988
 HV1988_MARKER: Z = SEE DESCRIPTION
 HV1988_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1988_SP_SET: LAMPPOST BASE
 HV1988_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1988
 HV1988  HISTORY     - Date     Condition        Report By
 HV1988  HISTORY     - UNK      MONUMENTED       NONE
 HV1988  HISTORY     - 1923     GOOD             CGS
 HV1988  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV1988  HISTORY     - 1978     MARK NOT FOUND   DMA
 HV1988
 HV1988                          STATION DESCRIPTION
 HV1988
 HV1988'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1988'AT WASHINGTON.
 HV1988'AT WASHINGTON, AT THE SOUTHWEST CORNER OF THE INTERSECTION OF
 HV1988'SIXTH AND E STREETS SOUTHWEST, AT THE ST. DOMINIC CATHOLIC
 HV1988'CHURCH, ON THE SOUTH SIDE OF THE EAST MAIN ENTRANCE, AND AT A
 HV1988'LAMPPOST.  THE SOUTHEAST CORNER OF THE RED SANDSTONE BASE OF
 HV1988'THE LAMPPOST.
 HV1988
 HV1988                          STATION RECOVERY (1971)
 HV1988
 HV1988'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971
 HV1988'MARK NOT FOUND.
 HV1988
 HV1988                          STATION RECOVERY (1978)
 HV1988
 HV1988'RECOVERY NOTE BY DEFENSE MAP AGENCY 1978
 HV1988'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1909 ***********************************************************************
 HV1909  DESIGNATION -  5
 HV1909  PID         -  HV1909
 HV1909  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1909  COUNTRY     -  US
 HV1909  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1909
 HV1909                         *CURRENT SURVEY CONTROL
 HV1909  ______________________________________________________________________
 HV1909* NAD 83(1986) POSITION- 38 56 33.     (N) 077 04 06.     (W)   SCALED
 HV1909* NAVD 88 ORTHO HEIGHT -   106.657 (meters)      349.92  (feet) ADJUSTED
 HV1909  ______________________________________________________________________
 HV1909  GEOID HEIGHT    -        -31.959 (meters)                     GEOID18
 HV1909  DYNAMIC HEIGHT  -        106.599 (meters)      349.73  (feet) COMP
 HV1909  MODELED GRAVITY -    980,082.9   (mgal)                       NAVD 88
 HV1909
 HV1909  VERT ORDER      -  SECOND    CLASS 0
 HV1909
 HV1909.The horizontal coordinates were scaled from a map and have
 HV1909.an estimated accuracy of +/- 6 seconds.
 HV1909
 HV1909.The orthometric height was determined by differential leveling and
 HV1909.adjusted by the NATIONAL GEODETIC SURVEY
 HV1909.in June 1991.
 HV1909
 HV1909.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1909.GEOID18 height accuracy estimate available here.
 HV1909
 HV1909.Click photographs - Photos may exist for this station.
 HV1909
 HV1909.The dynamic height is computed by dividing the NAVD 88
 HV1909.geopotential number by the normal gravity value computed on the
 HV1909.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1909.degrees latitude (g = 980.6199 gals.).
 HV1909
 HV1909.The modeled gravity was interpolated from observed gravity values.
 HV1909
 HV1909
 HV1909_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ207124(NAD 83)
 HV1909
 HV1909                          SUPERSEDED SURVEY CONTROL
 HV1909
 HV1909  NGVD 29 (11/26/84)  106.889  (m)          350.69   (f) ADJUSTED    2 0
 HV1909
 HV1909.Superseded values are not recommended for survey control.
 HV1909
 HV1909.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1909.See file dsdata.pdf to determine how the superseded data were derived.
 HV1909
 HV1909_MARKER: X = CHISELED CROSS
 HV1909_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1909_SP_SET: STEP
 HV1909_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1909
 HV1909  HISTORY     - Date     Condition        Report By
 HV1909  HISTORY     - UNK      MONUMENTED       CGS
 HV1909  HISTORY     - 1970     GOOD             NGS
 HV1909
 HV1909                          STATION DESCRIPTION
 HV1909
 HV1909'DESCRIBED BY NATIONAL GEODETIC SURVEY 1970
 HV1909'IN WASHINGTON.
 HV1909'AT WASHINGTON D.C. IN THE NW SECTION ON THE GROUNDS OF THE OLD
 HV1909'BUREAU OF STANDARDS, NOW OCCUPIED BY WASHINGTON INSTITUTE OF
 HV1909'TECH.  LOCATED IN THE E. END OF THE TOP CONC. STEP TO THE S.
 HV1909'ENTRANCE TO BUILDING NO. 18 6 IN S. OF THE S. WALL OF BUILDING
 HV1909'6 IN W. OF THE W. EDGE OF THE E. CONC. RETAINING WALL OF THE
 HV1909'STEPS.  A 1 1/2 AND 1 1/2 CHISELED CROSS IN THE CONC. STEP.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1270 ***********************************************************************
 HV1270  DESIGNATION -  5 BORR
 HV1270  PID         -  HV1270
 HV1270  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1270  COUNTRY     -  US
 HV1270  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1270
 HV1270                         *CURRENT SURVEY CONTROL
 HV1270  ______________________________________________________________________
 HV1270* NAD 83(1986) POSITION- 38 55 54.     (N) 076 57 33.     (W)   SCALED
 HV1270* NAVD 88 ORTHO HEIGHT -    17.922 (meters)       58.80  (feet) ADJUSTED
 HV1270  ______________________________________________________________________
 HV1270  GEOID HEIGHT    -        -32.150 (meters)                     GEOID18
 HV1270  DYNAMIC HEIGHT  -         17.912 (meters)       58.77  (feet) COMP
 HV1270  MODELED GRAVITY -    980,104.1   (mgal)                       NAVD 88
 HV1270
 HV1270  VERT ORDER      -  FIRST     CLASS I
 HV1270
 HV1270.The horizontal coordinates were scaled from a map and have
 HV1270.an estimated accuracy of +/- 6 seconds.
 HV1270
 HV1270.The orthometric height was determined by differential leveling and
 HV1270.adjusted by the NATIONAL GEODETIC SURVEY
 HV1270.in June 1991.
 HV1270
 HV1270.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1270.GEOID18 height accuracy estimate available here.
 HV1270
 HV1270.Click photographs - Photos may exist for this station.
 HV1270
 HV1270.The dynamic height is computed by dividing the NAVD 88
 HV1270.geopotential number by the normal gravity value computed on the
 HV1270.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1270.degrees latitude (g = 980.6199 gals.).
 HV1270
 HV1270.The modeled gravity was interpolated from observed gravity values.
 HV1270
 HV1270
 HV1270_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ301110(NAD 83)
 HV1270
 HV1270                          SUPERSEDED SURVEY CONTROL
 HV1270
 HV1270  NGVD 29 (11/26/84)   18.150  (m)           59.55   (f) ADJUSTED    1 1
 HV1270
 HV1270.Superseded values are not recommended for survey control.
 HV1270
 HV1270.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1270.See file dsdata.pdf to determine how the superseded data were derived.
 HV1270
 HV1270_MARKER: B = BOLT
 HV1270_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1270_SP_SET: FOOT OF BRIDGE FOUNDATION
 HV1270_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1270
 HV1270  HISTORY     - Date     Condition        Report By
 HV1270  HISTORY     - 1903     MONUMENTED       BORR
 HV1270  HISTORY     - 1971     GOOD             NGS
 HV1270
 HV1270                          STATION DESCRIPTION
 HV1270
 HV1270'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1270'AT WASHINGTON.
 HV1270'AT WASHINGTON, D.C., AT THE SUBURB OF LANGDON, AT THE EASTERN
 HV1270'AVENUE OVERPASS FOR THE BALTIMORE AND OHIO RAILROAD, ABOUT 0.35
 HV1270'MILE SOUTHEAST OF THE JUNCTION OF THE AVENUE AND U.S. HIGHWAY 1,
 HV1270'53.2 FEET SOUTHWEST OF THE SOUTHWEST SIDE OF THE NEW OVERPASS,
 HV1270'SET IN THE TOP OF THE NORTHWEST CORNER OF A MASONRY FOOTING AT
 HV1270'THE OLD BRIDGE FOUNDATION, 8 FEET SOUTHEAST OF THE SOUTHEAST RAIL
 HV1270'OF THE SOUTHEAST TRACK, AND ABOUT 2 1/2 FEET BELOW THE LEVEL OF
 HV1270'THE TRACKS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1387 ***********************************************************************
 HV1387  DESIGNATION -  5 WNY
 HV1387  PID         -  HV1387
 HV1387  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1387  COUNTRY     -  US
 HV1387  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1387
 HV1387                         *CURRENT SURVEY CONTROL
 HV1387  ______________________________________________________________________
 HV1387* NAD 83(1986) POSITION- 38 52 29.     (N) 077 00 02.     (W)   SCALED
 HV1387* NAVD 88 ORTHO HEIGHT -     3.407 (meters)       11.18  (feet) ADJUSTED
 HV1387  ______________________________________________________________________
 HV1387  GEOID HEIGHT    -        -32.172 (meters)                     GEOID18
 HV1387  DYNAMIC HEIGHT  -          3.405 (meters)       11.17  (feet) COMP
 HV1387  MODELED GRAVITY -    980,096.6   (mgal)                       NAVD 88
 HV1387
 HV1387  VERT ORDER      -  FIRST     CLASS II
 HV1387
 HV1387.The horizontal coordinates were scaled from a map and have
 HV1387.an estimated accuracy of +/- 6 seconds.
 HV1387
 HV1387.The orthometric height was determined by differential leveling and
 HV1387.adjusted by the NATIONAL GEODETIC SURVEY
 HV1387.in June 1991.
 HV1387
 HV1387.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1387.GEOID18 height accuracy estimate available here.
 HV1387
 HV1387.Click photographs - Photos may exist for this station.
 HV1387
 HV1387.The dynamic height is computed by dividing the NAVD 88
 HV1387.geopotential number by the normal gravity value computed on the
 HV1387.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1387.degrees latitude (g = 980.6199 gals.).
 HV1387
 HV1387.The modeled gravity was interpolated from observed gravity values.
 HV1387
 HV1387
 HV1387_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ264047(NAD 83)
 HV1387
 HV1387                          SUPERSEDED SURVEY CONTROL
 HV1387
 HV1387  NGVD 29 (11/26/84)    3.651  (m)           11.98   (f) ADJUSTED    1 2
 HV1387
 HV1387.Superseded values are not recommended for survey control.
 HV1387
 HV1387.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1387.See file dsdata.pdf to determine how the superseded data were derived.
 HV1387
 HV1387_MARKER: DJ = TIDAL STATION DISK
 HV1387_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1387_SP_SET: FOOTING
 HV1387_STAMPING: NO 5 1940
 HV1387_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1387
 HV1387  HISTORY     - Date     Condition        Report By
 HV1387  HISTORY     - 1940     MONUMENTED       USN
 HV1387  HISTORY     - 1942     GOOD             CGS
 HV1387  HISTORY     - 1955     GOOD             CGS
 HV1387  HISTORY     - 19950811 MARK NOT FOUND   USPSQD
 HV1387
 HV1387                          STATION DESCRIPTION
 HV1387
 HV1387'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1387'IN WASHINGTON.
 HV1387'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1387'AT THE NORTHEAST CORNER OF THE INTERSECTION OF FOURTH AND TINGEY
 HV1387'STREETS, AT BUILDING 135, 6.2 FEET SOUTH AND 9.5 FEET WEST OF
 HV1387'THE SOUTHEAST CORNER, AND IN THE SOUTHEAST CORNER OF THE EAST
 HV1387'FOOTING OF THE WEST BENT OF THE CRANE RUNWAY ADJACENT TO THE
 HV1387'BUILDING.  A WASHINGTON NAVY YARD STANDARD DISK, STAMPED NO 5 1940.
 HV1387
 HV1387                          STATION RECOVERY (1955)
 HV1387
 HV1387'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1387'RECOVERED IN GOOD CONDITION.
 HV1387
 HV1387                          STATION RECOVERY (1995)
 HV1387
 HV1387'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1387'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1910 ***********************************************************************
 HV1910  DESIGNATION -  6
 HV1910  PID         -  HV1910
 HV1910  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1910  COUNTRY     -  US
 HV1910  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1910
 HV1910                         *CURRENT SURVEY CONTROL
 HV1910  ______________________________________________________________________
 HV1910* NAD 83(1986) POSITION- 38 56 32.     (N) 077 04 04.     (W)   SCALED
 HV1910* NAVD 88 ORTHO HEIGHT -   107.923 (meters)      354.08  (feet) ADJUSTED
 HV1910  ______________________________________________________________________
 HV1910  GEOID HEIGHT    -        -31.960 (meters)                     GEOID18
 HV1910  DYNAMIC HEIGHT  -        107.865 (meters)      353.89  (feet) COMP
 HV1910  MODELED GRAVITY -    980,082.9   (mgal)                       NAVD 88
 HV1910
 HV1910  VERT ORDER      -  SECOND    CLASS 0
 HV1910
 HV1910.The horizontal coordinates were scaled from a map and have
 HV1910.an estimated accuracy of +/- 6 seconds.
 HV1910
 HV1910.The orthometric height was determined by differential leveling and
 HV1910.adjusted by the NATIONAL GEODETIC SURVEY
 HV1910.in June 1991.
 HV1910
 HV1910.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1910.GEOID18 height accuracy estimate available here.
 HV1910
 HV1910.Click photographs - Photos may exist for this station.
 HV1910
 HV1910.The dynamic height is computed by dividing the NAVD 88
 HV1910.geopotential number by the normal gravity value computed on the
 HV1910.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1910.degrees latitude (g = 980.6199 gals.).
 HV1910
 HV1910.The modeled gravity was interpolated from observed gravity values.
 HV1910
 HV1910
 HV1910_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ207123(NAD 83)
 HV1910
 HV1910                          SUPERSEDED SURVEY CONTROL
 HV1910
 HV1910  NGVD 29 (11/26/84)  108.155  (m)          354.84   (f) ADJUSTED    2 0
 HV1910
 HV1910.Superseded values are not recommended for survey control.
 HV1910
 HV1910.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1910.See file dsdata.pdf to determine how the superseded data were derived.
 HV1910
 HV1910_MARKER: X = CHISELED CROSS
 HV1910_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1910_SP_SET: STEP
 HV1910_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1910
 HV1910  HISTORY     - Date     Condition        Report By
 HV1910  HISTORY     - UNK      MONUMENTED       CGS
 HV1910  HISTORY     - 1970     GOOD             NGS
 HV1910
 HV1910                          STATION DESCRIPTION
 HV1910
 HV1910'DESCRIBED BY NATIONAL GEODETIC SURVEY 1970
 HV1910'IN WASHINGTON.
 HV1910'AT WASHINGTON D.C. IN THE N.W. SECTION, ON THE GROUNDS OF THE
 HV1910'OLD BUREAU OF STANDARDS NOW OCCUPIED BY THE WASHINGTON INSTITUTE
 HV1910'OF TECH. LOCATED IN THE N. END OF THE TOP CONC. STEP TO THE
 HV1910'E. ENTRANCE OF BUILDING NO. 4.  5 IN E. OF THE E. BRICK WALL,
 HV1910'5 IN S. OF THE S. EDGE OF THE N. CONC. RETAINING WALL OF THE
 HV1910'STEPS.  A 1 1/2 X 1 1/2 CHISELED CROSS IN THE CONC. STEP.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4504 ***********************************************************************
 HV4504  DESIGNATION -  6 C
 HV4504  PID         -  HV4504
 HV4504  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4504  COUNTRY     -  US
 HV4504  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4504
 HV4504                         *CURRENT SURVEY CONTROL
 HV4504  ______________________________________________________________________
 HV4504* NAD 83(1993) POSITION- 38 53 37.30782(N) 077 01 11.12843(W)   ADJUSTED
 HV4504* NAVD 88 ORTHO HEIGHT -     4.13  (+/-2cm)       13.5   (feet) VERTCON3
 HV4504  ______________________________________________________________________
 HV4504  GEOID HEIGHT    -        -32.102 (meters)                     GEOID18
 HV4504  LAPLACE CORR    -         -3.02  (seconds)                    DEFLEC18
 HV4504  HORZ ORDER      -  SECOND
 HV4504  VERT ORDER      -  THIRD ? (See Below)
 HV4504
 HV4504.The horizontal coordinates were established by classical geodetic methods
 HV4504.and adjusted by the National Geodetic Survey in November 1994.
 HV4504
 HV4504.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4504.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4504
 HV4504.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4504.GEOID18 height accuracy estimate available here.
 HV4504
 HV4504.The vertical order pertains to the NGVD 29 superseded value.
 HV4504
 HV4504.Click photographs - Photos may exist for this station.
 HV4504
 HV4504.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4504
 HV4504. The following values were computed from the NAD 83(1993) position.
 HV4504
 HV4504;                    North         East     Units Scale Factor Converg.
 HV4504;SPC MD       -   136,205.761   398,285.972   MT  0.99994990   -0 00 44.6
 HV4504;SPC MD       -   446,868.40  1,306,709.89   sFT  0.99994990   -0 00 44.6
 HV4504;SPC VA N     - 2,137,235.689 3,628,408.997   MT  0.99995997   +0 55 25.8
 HV4504;SPC VA N     - 7,011,914.09 11,904,205.18   sFT  0.99995997   +0 55 25.8
 HV4504;UTM  18      - 4,306,919.035   324,836.465   MT  0.99997783   -1 16 06.5
 HV4504
 HV4504!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4504!SPC MD       -   1.00000439  x   0.99994990  =   0.99995429
 HV4504!SPC VA N     -   1.00000439  x   0.99995997  =   0.99996436
 HV4504!UTM  18      -   1.00000439  x   0.99997783  =   0.99998222
 HV4504
 HV4504:                Primary Azimuth Mark                     Grid Az
 HV4504:SPC MD       -  6 C AZ MK                                001 16 33.2
 HV4504:SPC VA N     -  6 C AZ MK                                000 20 22.8
 HV4504:UTM  18      -  6 C AZ MK                                002 31 55.1
 HV4504
 HV4504_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2483606919(NAD 83)
 HV4504
 HV4504|---------------------------------------------------------------------|
 HV4504| PID    Reference Object                     Distance      Geod. Az  |
 HV4504|                                                           dddmmss.s |
 HV4504| DC6625 6 C AZ MK                                          0011548.6 |
 HV4504| HV4502 3 C                                 382.050 METERS 09013     |
 HV4504| HV4508 6 CON                               168.692 METERS 19251     |
 HV4504| HV4507 6 D                                 132.738 METERS 34930     |
 HV4504|---------------------------------------------------------------------|
 HV4504
 HV4504                          SUPERSEDED SURVEY CONTROL
 HV4504
 HV4504  NAD 83(1991)-  38 53 37.30666(N)    077 01 11.12966(W) AD(       ) 2
 HV4504  NAD 83(1986)-  38 53 37.30615(N)    077 01 11.14036(W) AD(       ) 2
 HV4504  NAD 27      -  38 53 36.90605(N)    077 01 12.22185(W) AD(       ) 2
 HV4504  NGVD 29 (07/19/86)    4.37   (m)           14.3    (f) LEVELING    3  
 HV4504
 HV4504.Superseded values are not recommended for survey control.
 HV4504
 HV4504.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4504.See file dsdata.pdf to determine how the superseded data were derived.
 HV4504
 HV4504_MARKER: DD = SURVEY DISK
 HV4504_SETTING: 0 = UNSPECIFIED SETTING
 HV4504
 HV4504  HISTORY     - Date     Condition        Report By
 HV4504  HISTORY     - 1981     MONUMENTED       CANDA
 HV4504
 HV4504                          STATION DESCRIPTION
 HV4504
 HV4504'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4504'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4504'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4504'
 HV4504'STATION IS LOCATED IN THE SIDEWALK ON THE NORTHEAST CORNER OF 6TH
 HV4504'STREET N.W. AND C STREET N.W.
 HV4504'
 HV4504'STATION IS 12.64 FT NW OF X ON SIGNAL POST BASE ON C ST.
 HV4504'
 HV4504'STATION IS 24.00 FT SW OF X ON RIM UTILITY M.H. AT COR OF D.C.
 HV4504'COURT HOUSE.
 HV4504'
 HV4504'STATION IS 10.62 FT SE OF SIGNAL POST BASE ON 6TH STREET.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4508 ***********************************************************************
 HV4508  DESIGNATION -  6 CON
 HV4508  PID         -  HV4508
 HV4508  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4508  COUNTRY     -  US
 HV4508  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4508
 HV4508                         *CURRENT SURVEY CONTROL
 HV4508  ______________________________________________________________________
 HV4508* NAD 83(1993) POSITION- 38 53 31.97444(N) 077 01 12.68539(W)   ADJUSTED
 HV4508* NAVD 88 ORTHO HEIGHT -     2.63  (+/-2cm)        8.6   (feet) VERTCON3
 HV4508  ______________________________________________________________________
 HV4508  GEOID HEIGHT    -        -32.104 (meters)                     GEOID18
 HV4508  LAPLACE CORR    -         -3.00  (seconds)                    DEFLEC18
 HV4508  HORZ ORDER      -  SECOND
 HV4508  VERT ORDER      -  THIRD ? (See Below)
 HV4508
 HV4508.The horizontal coordinates were established by classical geodetic methods
 HV4508.and adjusted by the National Geodetic Survey in November 1994.
 HV4508
 HV4508.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4508.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4508
 HV4508.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4508.GEOID18 height accuracy estimate available here.
 HV4508
 HV4508.The vertical order pertains to the NGVD 29 superseded value.
 HV4508
 HV4508.Click photographs - Photos may exist for this station.
 HV4508
 HV4508.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4508
 HV4508. The following values were computed from the NAD 83(1993) position.
 HV4508
 HV4508;                    North         East     Units Scale Factor Converg.
 HV4508;SPC MD       -   136,041.312   398,248.417   MT  0.99994989   -0 00 45.6
 HV4508;SPC MD       -   446,328.87  1,306,586.68   sFT  0.99994989   -0 00 45.6
 HV4508;SPC VA N     - 2,137,070.646 3,628,374.133   MT  0.99995985   +0 55 24.9
 HV4508;SPC VA N     - 7,011,372.61 11,904,090.80   sFT  0.99995985   +0 55 24.9
 HV4508;UTM  18      - 4,306,755.444   324,795.313   MT  0.99997800   -1 16 07.4
 HV4508
 HV4508!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4508!SPC MD       -   1.00000462  x   0.99994989  =   0.99995451
 HV4508!SPC VA N     -   1.00000462  x   0.99995985  =   0.99996447
 HV4508!UTM  18      -   1.00000462  x   0.99997800  =   0.99998262
 HV4508
 HV4508:                Primary Azimuth Mark                     Grid Az
 HV4508:SPC MD       -  6 CON AZ MK                              056 32 52.9
 HV4508:SPC VA N     -  6 CON AZ MK                              055 36 42.4
 HV4508:UTM  18      -  6 CON AZ MK                              057 48 14.7
 HV4508
 HV4508_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2479506755(NAD 83)
 HV4508
 HV4508|---------------------------------------------------------------------|
 HV4508| PID    Reference Object                     Distance      Geod. Az  |
 HV4508|                                                           dddmmss.s |
 HV4508| HV4504 6 C                                 168.692 METERS 01251     |
 HV4508| DC6626 6 CON AZ MK                                        0563207.3 |
 HV4508| HV4501 3 PEN                               452.978 METERS 0984503.3 |
 HV4508| HV4512 9 CON                               343.809 METERS 27045     |
 HV4508|---------------------------------------------------------------------|
 HV4508
 HV4508                          SUPERSEDED SURVEY CONTROL
 HV4508
 HV4508  NAD 83(1991)-  38 53 31.97328(N)    077 01 12.68662(W) AD(       ) 2
 HV4508  NAD 83(1986)-  38 53 31.97278(N)    077 01 12.69734(W) AD(       ) 2
 HV4508  NAD 27      -  38 53 31.57263(N)    077 01 13.77888(W) AD(       ) 2
 HV4508  NGVD 29 (07/19/86)    2.87   (m)            9.4    (f) LEVELING    3  
 HV4508
 HV4508.Superseded values are not recommended for survey control.
 HV4508
 HV4508.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4508.See file dsdata.pdf to determine how the superseded data were derived.
 HV4508
 HV4508_MARKER: DD = SURVEY DISK
 HV4508_SETTING: 0 = UNSPECIFIED SETTING
 HV4508
 HV4508  HISTORY     - Date     Condition        Report By
 HV4508  HISTORY     - 1981     MONUMENTED       CANDA
 HV4508
 HV4508                          STATION DESCRIPTION
 HV4508
 HV4508'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4508'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4508'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4508'
 HV4508'STATION IS LOCATED IN GRASSY AREA BORDERED BY BRICK WALK IN CONCRETE
 HV4508'SIDEWALK ON THE NORTHWEST CORNER OF 6TH STREET N.W. AND CONSTITUTION
 HV4508'AVE. N.W.
 HV4508'
 HV4508'STATION IS 13.10 FT N OF X ON RIM SAN. M.H. IN CON. AVE.
 HV4508'
 HV4508'STATION IS 16.95 FT NW OF SIGNAL POST BASE AT CORNER.
 HV4508'
 HV4508'STATION IS 48.03 FT SW OF SIGNAL POST BASE ON 6TH STREET.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4507 ***********************************************************************
 HV4507  DESIGNATION -  6 D
 HV4507  PID         -  HV4507
 HV4507  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4507  COUNTRY     -  US
 HV4507  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4507
 HV4507                         *CURRENT SURVEY CONTROL
 HV4507  ______________________________________________________________________
 HV4507* NAD 83(1993) POSITION- 38 53 41.54034(N) 077 01 12.13147(W)   ADJUSTED
 HV4507* NAVD 88 ORTHO HEIGHT -     9.87  (+/-2cm)       32.4   (feet) VERTCON3
 HV4507  ______________________________________________________________________
 HV4507  GEOID HEIGHT    -        -32.099 (meters)                     GEOID18
 HV4507  LAPLACE CORR    -         -3.02  (seconds)                    DEFLEC18
 HV4507  HORZ ORDER      -  SECOND
 HV4507  VERT ORDER      -  THIRD ? (See Below)
 HV4507
 HV4507.The horizontal coordinates were established by classical geodetic methods
 HV4507.and adjusted by the National Geodetic Survey in November 1994.
 HV4507
 HV4507.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4507.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4507
 HV4507.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4507.GEOID18 height accuracy estimate available here.
 HV4507
 HV4507.The vertical order pertains to the NGVD 29 superseded value.
 HV4507
 HV4507.Click photographs - Photos may exist for this station.
 HV4507
 HV4507.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4507
 HV4507. The following values were computed from the NAD 83(1993) position.
 HV4507
 HV4507;                    North         East     Units Scale Factor Converg.
 HV4507;SPC MD       -   136,336.278   398,261.830   MT  0.99994990   -0 00 45.3
 HV4507;SPC MD       -   447,296.61  1,306,630.69   sFT  0.99994990   -0 00 45.3
 HV4507;SPC VA N     - 2,137,365.796 3,628,382.725   MT  0.99996007   +0 55 25.2
 HV4507;SPC VA N     - 7,012,340.95 11,904,118.99   sFT  0.99996007   +0 55 25.2
 HV4507;UTM  18      - 4,307,050.054   324,815.189   MT  0.99997792   -1 16 07.3
 HV4507
 HV4507!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4507!SPC MD       -   1.00000349  x   0.99994990  =   0.99995339
 HV4507!SPC VA N     -   1.00000349  x   0.99996007  =   0.99996356
 HV4507!UTM  18      -   1.00000349  x   0.99997792  =   0.99998141
 HV4507
 HV4507:                Primary Azimuth Mark                     Grid Az
 HV4507:SPC MD       -  6 D AZ MK                                171 38 00.0
 HV4507:SPC VA N     -  6 D AZ MK                                170 41 49.5
 HV4507:UTM  18      -  6 D AZ MK                                172 53 22.0
 HV4507
 HV4507_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2481507050(NAD 83)
 HV4507
 HV4507|---------------------------------------------------------------------|
 HV4507| PID    Reference Object                     Distance      Geod. Az  |
 HV4507|                                                           dddmmss.s |
 HV4507| HV4506 6 E                                 148.704 METERS 00012     |
 HV4507| HV4504 6 C                                 132.738 METERS 16930     |
 HV4507| DC6627 6 D AZ MK                                          1713714.7 |
 HV4507|---------------------------------------------------------------------|
 HV4507
 HV4507                          SUPERSEDED SURVEY CONTROL
 HV4507
 HV4507  NAD 83(1991)-  38 53 41.53919(N)    077 01 12.13270(W) AD(       ) 2
 HV4507  NAD 83(1986)-  38 53 41.53866(N)    077 01 12.14338(W) AD(       ) 2
 HV4507  NAD 27      -  38 53 41.13869(N)    077 01 13.22484(W) AD(       ) 2
 HV4507  NGVD 29 (07/19/86)   10.11   (m)           33.2    (f) LEVELING    3  
 HV4507
 HV4507.Superseded values are not recommended for survey control.
 HV4507
 HV4507.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4507.See file dsdata.pdf to determine how the superseded data were derived.
 HV4507
 HV4507_MARKER: DD = SURVEY DISK
 HV4507_SETTING: 0 = UNSPECIFIED SETTING
 HV4507
 HV4507  HISTORY     - Date     Condition        Report By
 HV4507  HISTORY     - 1981     MONUMENTED       CANDA
 HV4507  HISTORY     - 20090319 MARK NOT FOUND   GEOCAC
 HV4507
 HV4507                          STATION DESCRIPTION
 HV4507
 HV4507'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4507'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4507'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4507'
 HV4507'STATION IS LOCATED IN THE SIDEWALK ON THE NORTHWEST CORNER OF 6TH
 HV4507'STREET N.W. AND D STREET N.W.
 HV4507'
 HV4507'STATION IS 14.36 FT NE OF FIRE HYDRANT ON D STREET.
 HV4507'
 HV4507'STATION IS 16.05 FT NW OF X ON RIM M.H. AT CORNER.
 HV4507'
 HV4507'STATION IS 18.06 FT SE CONC. STEP AT S. RAILING.
 HV4507
 HV4507                          STATION RECOVERY (2009)
 HV4507
 HV4507'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV4507'WE LOOKED ALL OVER THE AREA, BUT THE POURED SIDEWALKS HAVE BEEN
 HV4507'REPLACED WITH BRICK PAVERS.  WE COULD NOT FIND ANY SIGN OF THE MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4506 ***********************************************************************
 HV4506  DESIGNATION -  6 E
 HV4506  PID         -  HV4506
 HV4506  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4506  COUNTRY     -  US
 HV4506  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4506
 HV4506                         *CURRENT SURVEY CONTROL
 HV4506  ______________________________________________________________________
 HV4506* NAD 83(1993) POSITION- 38 53 46.36257(N) 077 01 12.10941(W)   ADJUSTED
 HV4506* NAVD 88 ORTHO HEIGHT -    13.77  (+/-2cm)       45.2   (feet) VERTCON3
 HV4506  ______________________________________________________________________
 HV4506  GEOID HEIGHT    -        -32.096 (meters)                     GEOID18
 HV4506  LAPLACE CORR    -         -3.02  (seconds)                    DEFLEC18
 HV4506  HORZ ORDER      -  SECOND
 HV4506  VERT ORDER      -  THIRD ? (See Below)
 HV4506
 HV4506.The horizontal coordinates were established by classical geodetic methods
 HV4506.and adjusted by the National Geodetic Survey in November 1994.
 HV4506
 HV4506.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4506.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4506
 HV4506.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4506.GEOID18 height accuracy estimate available here.
 HV4506
 HV4506.The vertical order pertains to the NGVD 29 superseded value.
 HV4506
 HV4506.Click photographs - Photos may exist for this station.
 HV4506
 HV4506.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4506
 HV4506. The following values were computed from the NAD 83(1993) position.
 HV4506
 HV4506;                    North         East     Units Scale Factor Converg.
 HV4506;SPC MD       -   136,484.974   398,262.394   MT  0.99994991   -0 00 45.3
 HV4506;SPC MD       -   447,784.45  1,306,632.54   sFT  0.99994991   -0 00 45.3
 HV4506;SPC VA N     - 2,137,514.482 3,628,380.859   MT  0.99996019   +0 55 25.2
 HV4506;SPC VA N     - 7,012,828.76 11,904,112.87   sFT  0.99996019   +0 55 25.2
 HV4506;UTM  18      - 4,307,198.706   324,819.013   MT  0.99997790   -1 16 07.4
 HV4506
 HV4506!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4506!SPC MD       -   1.00000287  x   0.99994991  =   0.99995278
 HV4506!SPC VA N     -   1.00000287  x   0.99996019  =   0.99996306
 HV4506!UTM  18      -   1.00000287  x   0.99997790  =   0.99998077
 HV4506
 HV4506:                Primary Azimuth Mark                     Grid Az
 HV4506:SPC MD       -  6 E AZ MK                                266 35 19.0
 HV4506:SPC VA N     -  6 E AZ MK                                265 39 08.5
 HV4506:UTM  18      -  6 E AZ MK                                267 50 41.1
 HV4506
 HV4506_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2481907198(NAD 83)
 HV4506
 HV4506|---------------------------------------------------------------------|
 HV4506| PID    Reference Object                     Distance      Geod. Az  |
 HV4506|                                                           dddmmss.s |
 HV4506| HV4507 6 D                                 148.704 METERS 18012     |
 HV4506| DC6628 6 E AZ MK                                          2663433.7 |
 HV4506| HV4509 7 E                                 173.935 METERS 27026     |
 HV4506|---------------------------------------------------------------------|
 HV4506
 HV4506                          SUPERSEDED SURVEY CONTROL
 HV4506
 HV4506  NAD 83(1991)-  38 53 46.36141(N)    077 01 12.11063(W) AD(       ) 2
 HV4506  NAD 83(1986)-  38 53 46.36086(N)    077 01 12.12130(W) AD(       ) 2
 HV4506  NAD 27      -  38 53 45.96103(N)    077 01 13.20281(W) AD(       ) 2
 HV4506  NGVD 29 (07/19/86)   14.01   (m)           46.0    (f) LEVELING    3  
 HV4506
 HV4506.Superseded values are not recommended for survey control.
 HV4506
 HV4506.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4506.See file dsdata.pdf to determine how the superseded data were derived.
 HV4506
 HV4506_MARKER: DD = SURVEY DISK
 HV4506_SETTING: 0 = UNSPECIFIED SETTING
 HV4506
 HV4506  HISTORY     - Date     Condition        Report By
 HV4506  HISTORY     - 1981     MONUMENTED       CANDA
 HV4506  HISTORY     - 20090319 MARK NOT FOUND   GEOCAC
 HV4506
 HV4506                          STATION DESCRIPTION
 HV4506
 HV4506'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4506'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4506'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4506'
 HV4506'STATION IS LOCATED ON SMALL ISLAND ON THE NORTHWEST CORNER OF
 HV4506'INTERSECTION OF 6TH STREET N.W. AND E STREET N.W.
 HV4506'
 HV4506'STATION IS 4.21 FT N OF SIGNAL POST BASE ON ISLAND.
 HV4506'
 HV4506'STATION IS 37.93 FT SW OF X ON RIM M.H. IN 6TH STREET.
 HV4506'
 HV4506'STATION IS 24.97 FT SE OF FIRE HYDRANT ON CORNER.
 HV4506
 HV4506                          STATION RECOVERY (2009)
 HV4506
 HV4506'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV4506'WE LOOKED ALL OVER THE AREA, BUT THE POURED SIDEWALKS HAVE BEEN
 HV4506'REPLACED WITH BRICK PAVERS.  WE COULD NOT FIND ANY SIGN OF THE MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1392 ***********************************************************************
 HV1392  DESIGNATION -  6 WNY
 HV1392  PID         -  HV1392
 HV1392  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1392  COUNTRY     -  US
 HV1392  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1392
 HV1392                         *CURRENT SURVEY CONTROL
 HV1392  ______________________________________________________________________
 HV1392* NAD 83(1986) POSITION- 38 52 29.     (N) 077 00 12.     (W)   SCALED
 HV1392* NAVD 88 ORTHO HEIGHT -     3.975 (meters)       13.04  (feet) ADJUSTED
 HV1392  ______________________________________________________________________
 HV1392  GEOID HEIGHT    -        -32.167 (meters)                     GEOID18
 HV1392  DYNAMIC HEIGHT  -          3.973 (meters)       13.03  (feet) COMP
 HV1392  MODELED GRAVITY -    980,096.8   (mgal)                       NAVD 88
 HV1392
 HV1392  VERT ORDER      -  FIRST     CLASS II
 HV1392
 HV1392.The horizontal coordinates were scaled from a map and have
 HV1392.an estimated accuracy of +/- 6 seconds.
 HV1392
 HV1392.The orthometric height was determined by differential leveling and
 HV1392.adjusted by the NATIONAL GEODETIC SURVEY
 HV1392.in June 1991.
 HV1392
 HV1392.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1392.GEOID18 height accuracy estimate available here.
 HV1392
 HV1392.Click photographs - Photos may exist for this station.
 HV1392
 HV1392.The dynamic height is computed by dividing the NAVD 88
 HV1392.geopotential number by the normal gravity value computed on the
 HV1392.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1392.degrees latitude (g = 980.6199 gals.).
 HV1392
 HV1392.The modeled gravity was interpolated from observed gravity values.
 HV1392
 HV1392
 HV1392_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ262047(NAD 83)
 HV1392
 HV1392                          SUPERSEDED SURVEY CONTROL
 HV1392
 HV1392  NGVD 29 (11/26/84)    4.218  (m)           13.84   (f) ADJUSTED    1 2
 HV1392
 HV1392.Superseded values are not recommended for survey control.
 HV1392
 HV1392.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1392.See file dsdata.pdf to determine how the superseded data were derived.
 HV1392
 HV1392_MARKER: DJ = TIDAL STATION DISK
 HV1392_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1392_SP_SET: PAVEMENT
 HV1392_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1392
 HV1392  HISTORY     - Date     Condition        Report By
 HV1392  HISTORY     - UNK      MONUMENTED       USN
 HV1392  HISTORY     - 1923     GOOD             CGS
 HV1392  HISTORY     - 1955     MARK NOT FOUND   CGS
 HV1392
 HV1392                          STATION DESCRIPTION
 HV1392
 HV1392'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1392'IN WASHINGTON.
 HV1392'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1392'ON THE NORTH SIDE OF BUILDING 159, AT THE EAST SIDE OF THE
 HV1392'WEST DOOR, IN THE PAVEMENT, 6 INCHES OUT FROM THE DOOR, AND
 HV1392'4 INCHES FROM THE EAST SIDE OF THE DOORWAY.  A WASHINGTON NAVY
 HV1392'YARD STANDARD DISK.
 HV1392
 HV1392                          STATION RECOVERY (1955)
 HV1392
 HV1392'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1392'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4509 ***********************************************************************
 HV4509  DESIGNATION -  7 E
 HV4509  PID         -  HV4509
 HV4509  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4509  COUNTRY     -  US
 HV4509  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4509
 HV4509                         *CURRENT SURVEY CONTROL
 HV4509  ______________________________________________________________________
 HV4509* NAD 83(1993) POSITION- 38 53 46.40454(N) 077 01 19.32701(W)   ADJUSTED
 HV4509* NAVD 88 ORTHO HEIGHT -    11.99  (+/-2cm)       39.3   (feet) VERTCON3
 HV4509  ______________________________________________________________________
 HV4509  GEOID HEIGHT    -        -32.093 (meters)                     GEOID18
 HV4509  LAPLACE CORR    -         -2.93  (seconds)                    DEFLEC18
 HV4509  HORZ ORDER      -  SECOND
 HV4509  VERT ORDER      -  THIRD ? (See Below)
 HV4509
 HV4509.The horizontal coordinates were established by classical geodetic methods
 HV4509.and adjusted by the National Geodetic Survey in November 1994.
 HV4509
 HV4509.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4509.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4509
 HV4509.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4509.GEOID18 height accuracy estimate available here.
 HV4509
 HV4509.The vertical order pertains to the NGVD 29 superseded value.
 HV4509
 HV4509.Click photographs - Photos may exist for this station.
 HV4509
 HV4509.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4509
 HV4509. The following values were computed from the NAD 83(1993) position.
 HV4509
 HV4509;                    North         East     Units Scale Factor Converg.
 HV4509;SPC MD       -   136,486.309   398,088.473   MT  0.99994991   -0 00 49.8
 HV4509;SPC MD       -   447,788.83  1,306,061.93   sFT  0.99994991   -0 00 49.8
 HV4509;SPC VA N     - 2,137,512.975 3,628,206.938   MT  0.99996019   +0 55 20.7
 HV4509;SPC VA N     - 7,012,823.82 11,903,542.26   sFT  0.99996019   +0 55 20.7
 HV4509;UTM  18      - 4,307,203.853   324,645.159   MT  0.99997865   -1 16 11.9
 HV4509
 HV4509!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4509!SPC MD       -   1.00000315  x   0.99994991  =   0.99995306
 HV4509!SPC VA N     -   1.00000315  x   0.99996019  =   0.99996334
 HV4509!UTM  18      -   1.00000315  x   0.99997865  =   0.99998180
 HV4509
 HV4509:                Primary Azimuth Mark                     Grid Az
 HV4509:SPC MD       -  7 E AZ MK                                264 28 01.8
 HV4509:SPC VA N     -  7 E AZ MK                                263 31 51.3
 HV4509:UTM  18      -  7 E AZ MK                                265 43 23.9
 HV4509
 HV4509_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2464507203(NAD 83)
 HV4509
 HV4509|---------------------------------------------------------------------|
 HV4509| PID    Reference Object                     Distance      Geod. Az  |
 HV4509|                                                           dddmmss.s |
 HV4509| HV4506 6 E                                 173.935 METERS 09026     |
 HV4509| HV4510 9 E                                 180.829 METERS 26310     |
 HV4509| DC6629 7 E AZ MK                                          2642712.0 |
 HV4509|---------------------------------------------------------------------|
 HV4509
 HV4509                          SUPERSEDED SURVEY CONTROL
 HV4509
 HV4509  NAD 83(1991)-  38 53 46.40338(N)    077 01 19.32824(W) AD(       ) 2
 HV4509  NAD 83(1986)-  38 53 46.40285(N)    077 01 19.33888(W) AD(       ) 2
 HV4509  NAD 27      -  38 53 46.00304(N)    077 01 20.41999(W) AD(       ) 2
 HV4509  NGVD 29 (07/19/86)   12.23   (m)           40.1    (f) LEVELING    3  
 HV4509
 HV4509.Superseded values are not recommended for survey control.
 HV4509
 HV4509.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4509.See file dsdata.pdf to determine how the superseded data were derived.
 HV4509
 HV4509_MARKER: DD = SURVEY DISK
 HV4509_SETTING: 0 = UNSPECIFIED SETTING
 HV4509
 HV4509  HISTORY     - Date     Condition        Report By
 HV4509  HISTORY     - 1981     MONUMENTED       CANDA
 HV4509  HISTORY     - 20090319 MARK NOT FOUND   GEOCAC
 HV4509
 HV4509                          STATION DESCRIPTION
 HV4509
 HV4509'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4509'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4509'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4509'
 HV4509'STATION IS LOCATED IN THE SIDEWALK ON THE NORTHWEST CORNER OF 7TH
 HV4509'STREET N.W. AND E STREET N.W.
 HV4509'
 HV4509'STATION IS 8.65 FT NE OF FIRE HYDRANT ON E STREET.
 HV4509'
 HV4509'STATION IS 13.51 FT NW OF X ON RIM PEPCO M.H. AT CORNER.
 HV4509'
 HV4509'STATION IS 14.09 FT SW OF SIGNAL POST BASE ON 7TH ST.
 HV4509
 HV4509                          STATION RECOVERY (2009)
 HV4509
 HV4509'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV4509'WE LOOKED ALL OVER THE AREA, BUT THE POURED SIDEWALKS HAVE BEEN
 HV4509'REPLACED WITH BRICK PAVERS.  WE COULD NOT FIND ANY SIGN OF THE MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1385 ***********************************************************************
 HV1385  DESIGNATION -  7 WNY
 HV1385  PID         -  HV1385
 HV1385  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1385  COUNTRY     -  US
 HV1385  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1385
 HV1385                         *CURRENT SURVEY CONTROL
 HV1385  ______________________________________________________________________
 HV1385* NAD 83(1986) POSITION- 38 52 29.     (N) 076 59 52.     (W)   SCALED
 HV1385* NAVD 88 ORTHO HEIGHT -     3.82  (+/-2cm)       12.5   (feet) VERTCON3
 HV1385  ______________________________________________________________________
 HV1385  GEOID HEIGHT    -        -32.176 (meters)                     GEOID18
 HV1385  VERT ORDER      -  ? (See Below)
 HV1385
 HV1385.The horizontal coordinates were scaled from a map and have
 HV1385.an estimated accuracy of +/- 6 seconds.
 HV1385
 HV1385.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1385.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1385
 HV1385.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1385.GEOID18 height accuracy estimate available here.
 HV1385
 HV1385.The vertical order pertains to the NGVD 29 superseded value.
 HV1385
 HV1385.Click photographs - Photos may exist for this station.
 HV1385
 HV1385
 HV1385_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ266047(NAD 83)
 HV1385
 HV1385                          SUPERSEDED SURVEY CONTROL
 HV1385
 HV1385  NGVD 29 (11/26/84)    4.064  (m)           13.33   (f) ADJUSTED       
 HV1385
 HV1385.Superseded values are not recommended for survey control.
 HV1385
 HV1385.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1385.See file dsdata.pdf to determine how the superseded data were derived.
 HV1385
 HV1385_MARKER: DD = SURVEY DISK
 HV1385_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1385_SP_SET: GARAGE DOORWAY
 HV1385_STAMPING: NO 7 19--
 HV1385_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1385
 HV1385  HISTORY     - Date     Condition        Report By
 HV1385  HISTORY     - UNK      MONUMENTED       USACE
 HV1385  HISTORY     - 1923     GOOD             CGS
 HV1385
 HV1385                          STATION DESCRIPTION
 HV1385
 HV1385'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1385'IN WASHINGTON.
 HV1385'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1385'AT THE NORTH END OF ISAAC HULL AVENUE, AT GARAGE 20 OF BUILDING
 HV1385'7, IN THE DOORWAY, 0.8 FOOT SOUTH OF THE DOOR, AND 0.4 FOOT
 HV1385'EAST OF THE WEST END OF THE DOORWAY.  A WASHINGTON NAVY YARD
 HV1385'STANDARD DISK, STAMPED NO 7 19--.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1403 ***********************************************************************
 HV1403  DESIGNATION -  70 WNY
 HV1403  PID         -  HV1403
 HV1403  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1403  COUNTRY     -  US
 HV1403  USGS QUAD   -  ANACOSTIA (2016)
 HV1403
 HV1403                         *CURRENT SURVEY CONTROL
 HV1403  ______________________________________________________________________
 HV1403* NAD 83(1986) POSITION- 38 52 18.     (N) 076 59 41.     (W)   SCALED
 HV1403* NAVD 88 ORTHO HEIGHT -     1.98  (+/-2cm)        6.5   (feet) VERTCON3
 HV1403  ______________________________________________________________________
 HV1403  GEOID HEIGHT    -        -32.187 (meters)                     GEOID18
 HV1403  VERT ORDER      -  ? (See Below)
 HV1403
 HV1403.The horizontal coordinates were scaled from a map and have
 HV1403.an estimated accuracy of +/- 6 seconds.
 HV1403
 HV1403.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1403.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1403
 HV1403.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1403.GEOID18 height accuracy estimate available here.
 HV1403
 HV1403.The vertical order pertains to the NGVD 29 superseded value.
 HV1403
 HV1403.Click photographs - Photos may exist for this station.
 HV1403
 HV1403
 HV1403_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ269044(NAD 83)
 HV1403
 HV1403                          SUPERSEDED SURVEY CONTROL
 HV1403
 HV1403  NGVD 29 (11/26/84)    2.221  (m)            7.29   (f) ADJUSTED       
 HV1403
 HV1403.Superseded values are not recommended for survey control.
 HV1403
 HV1403.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1403.See file dsdata.pdf to determine how the superseded data were derived.
 HV1403
 HV1403_MARKER: DD = SURVEY DISK
 HV1403_SETTING: 0 = UNSPECIFIED SETTING
 HV1403_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1403
 HV1403  HISTORY     - Date     Condition        Report By
 HV1403  HISTORY     - UNK      MONUMENTED       USACE
 HV1403  HISTORY     - 1923     GOOD             CGS
 HV1403  HISTORY     - 1955     GOOD             CGS
 HV1403
 HV1403                          STATION DESCRIPTION
 HV1403
 HV1403'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1403'IN WASHINGTON.
 HV1403'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN
 HV1403'FACTORY, NEAR ANACOSTIA RIVER, WEST OF A MARINE RAILWAY, AND AT
 HV1403'THE SOUTH END OF BUILDING 70.  A WASHINGTON NAVY YARD STANDARD
 HV1403'DISK.
 HV1403
 HV1403                          STATION RECOVERY (1955)
 HV1403
 HV1403'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1403'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1912 ***********************************************************************
 HV1912  DESIGNATION -  8
 HV1912  PID         -  HV1912
 HV1912  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1912  COUNTRY     -  US
 HV1912  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1912
 HV1912                         *CURRENT SURVEY CONTROL
 HV1912  ______________________________________________________________________
 HV1912* NAD 83(1986) POSITION- 38 56 38.     (N) 077 04 07.     (W)   SCALED
 HV1912* NAVD 88 ORTHO HEIGHT -   101.436 (meters)      332.79  (feet) ADJUSTED
 HV1912  ______________________________________________________________________
 HV1912  GEOID HEIGHT    -        -31.957 (meters)                     GEOID18
 HV1912  DYNAMIC HEIGHT  -        101.381 (meters)      332.61  (feet) COMP
 HV1912  MODELED GRAVITY -    980,082.8   (mgal)                       NAVD 88
 HV1912
 HV1912  VERT ORDER      -  SECOND    CLASS 0
 HV1912
 HV1912.The horizontal coordinates were scaled from a map and have
 HV1912.an estimated accuracy of +/- 6 seconds.
 HV1912
 HV1912.The orthometric height was determined by differential leveling and
 HV1912.adjusted by the NATIONAL GEODETIC SURVEY
 HV1912.in June 1991.
 HV1912
 HV1912.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1912.GEOID18 height accuracy estimate available here.
 HV1912
 HV1912.Click photographs - Photos may exist for this station.
 HV1912
 HV1912.The dynamic height is computed by dividing the NAVD 88
 HV1912.geopotential number by the normal gravity value computed on the
 HV1912.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1912.degrees latitude (g = 980.6199 gals.).
 HV1912
 HV1912.The modeled gravity was interpolated from observed gravity values.
 HV1912
 HV1912
 HV1912_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ207125(NAD 83)
 HV1912
 HV1912                          SUPERSEDED SURVEY CONTROL
 HV1912
 HV1912  NGVD 29 (11/26/84)  101.668  (m)          333.56   (f) ADJUSTED    2 0
 HV1912
 HV1912.Superseded values are not recommended for survey control.
 HV1912
 HV1912.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1912.See file dsdata.pdf to determine how the superseded data were derived.
 HV1912
 HV1912_MARKER: X = CHISELED CROSS
 HV1912_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1912_SP_SET: STEP
 HV1912_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1912
 HV1912  HISTORY     - Date     Condition        Report By
 HV1912  HISTORY     - UNK      MONUMENTED       CGS
 HV1912  HISTORY     - 1928     GOOD             CGS
 HV1912
 HV1912                          STATION DESCRIPTION
 HV1912
 HV1912'DESCRIBED BY COAST AND GEODETIC SURVEY 1928
 HV1912'IN WASHINGTON.
 HV1912'IN NORTHWEST WASHINGTON, AT THE NATIONAL BUREAU OF STANDARDS,
 HV1912'AT THE RADIO BUILDING, AT THE RIGHT SIDE OF THE NORTH ENTRANCE,
 HV1912'AND ON THE TOP STEP.  A CHISELED CROSS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6620 ***********************************************************************
 DL6620  DESIGNATION -  801 HV86006
 DL6620  PID         -  DL6620
 DL6620  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6620  COUNTRY     -  US
 DL6620  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6620
 DL6620                         *CURRENT SURVEY CONTROL
 DL6620  ______________________________________________________________________
 DL6620* NAD 83(1986) POSITION- 38 52 55.83   (N) 077 02 02.19   (W)   HD_HELD1
 DL6620* NAVD 88 ORTHO HEIGHT -     1.443 (meters)        4.73  (feet) ADJUSTED
 DL6620  ______________________________________________________________________
 DL6620  GEOID HEIGHT    -        -32.105 (meters)                     GEOID18
 DL6620  DYNAMIC HEIGHT  -          1.442 (meters)        4.73  (feet) COMP
 DL6620  MODELED GRAVITY -    980,096.2   (mgal)                       NAVD 88
 DL6620
 DL6620  VERT ORDER      -  FIRST     CLASS II
 DL6620
 DL6620.The horizontal coordinates were determined by differentially corrected
 DL6620.hand held GPS observations or other comparable positioning techniques
 DL6620.and have an estimated accuracy of +/- 3 meters.
 DL6620
 DL6620.The orthometric height was determined by differential leveling and
 DL6620.adjusted by the NATIONAL GEODETIC SURVEY
 DL6620.in October 2012.
 DL6620
 DL6620.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6620.GEOID18 height accuracy estimate available here.
 DL6620
 DL6620.Click photographs - Photos may exist for this station.
 DL6620
 DL6620.The dynamic height is computed by dividing the NAVD 88
 DL6620.geopotential number by the normal gravity value computed on the
 DL6620.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6620.degrees latitude (g = 980.6199 gals.).
 DL6620
 DL6620.The modeled gravity was interpolated from observed gravity values.
 DL6620
 DL6620
 DL6620_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2357705667(NAD 83)
 DL6620
 DL6620                          SUPERSEDED SURVEY CONTROL
 DL6620
 DL6620  NAVD 88 (04/20/10)    2.160  (m)            7.09   (f) SUPERSEDED  1 2
 DL6620
 DL6620.Superseded values are not recommended for survey control.
 DL6620
 DL6620.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 DL6620.See file dsdata.pdf to determine how the superseded data were derived.
 DL6620
 DL6620_MARKER: DD = SURVEY DISK
 DL6620_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DL6620_STAMPING: 801 HV86006
 DL6620_MARK LOGO: NPS
 DL6620_PROJECTION: FLUSH
 DL6620_MAGNETIC: N = NO MAGNETIC MATERIAL
 DL6620_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DL6620+STABILITY: SURFACE MOTION
 DL6620_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 DL6620+SATELLITE: SATELLITE OBSERVATIONS - March 30, 2022
 DL6620
 DL6620  HISTORY     - Date     Condition        Report By
 DL6620  HISTORY     - UNK      MONUMENTED       NPS
 DL6620  HISTORY     - 20081222 GOOD             NGS
 DL6620  HISTORY     - 20120301 GOOD             NGS
 DL6620  HISTORY     - 20220330 GOOD             NGS
 DL6620
 DL6620                          STATION DESCRIPTION
 DL6620
 DL6620'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6620'THE MARK IS LOCATED ALONG THE TIDAL BASIN AT THE JEFFERSON MEMORIAL.
 DL6620'0.13 MI (0.2 KM) EAST OF THE JEFFERSON MEMORIAL ALONG WALKWAY.
 DL6620'
 DL6620'THE MARK IS A NATIONAL PARK SERVICE DISK SET IN A CONCRETE POST.
 DL6620'
 DL6620'IT IS 33.7 FT (10.3 M) SOUTHWEST OF THE CURB, 13.3 FT (4.1 M)
 DL6620'SOUTHWEST OF THE CENTER OF A ASPHALT SIDEWALK, AND 5.2 FT (1.6 M)
 DL6620'SOUTHEAST OF A TREE.
 DL6620
 DL6620                          STATION RECOVERY (2012)
 DL6620
 DL6620'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DL6620'RECOVERED AS DESCRIBED.
 DL6620
 DL6620                          STATION RECOVERY (2022)
 DL6620
 DL6620'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2022 (GAS)
 DL6620'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6617 ***********************************************************************
 DL6617  DESIGNATION -  801 HV86023
 DL6617  PID         -  DL6617
 DL6617  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6617  COUNTRY     -  US
 DL6617  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6617
 DL6617                         *CURRENT SURVEY CONTROL
 DL6617  ______________________________________________________________________
 DL6617* NAD 83(1986) POSITION- 38 53 08.16   (N) 077 02 12.29   (W)   HD_HELD1
 DL6617* NAVD 88 ORTHO HEIGHT -     1.653 (meters)        5.42  (feet) ADJUSTED
 DL6617  ______________________________________________________________________
 DL6617  GEOID HEIGHT    -        -32.094 (meters)                     GEOID18
 DL6617  DYNAMIC HEIGHT  -          1.652 (meters)        5.42  (feet) COMP
 DL6617  MODELED GRAVITY -    980,097.4   (mgal)                       NAVD 88
 DL6617
 DL6617  VERT ORDER      -  FIRST     CLASS II
 DL6617
 DL6617.The horizontal coordinates were determined by differentially corrected
 DL6617.hand held GPS observations or other comparable positioning techniques
 DL6617.and have an estimated accuracy of +/- 3 meters.
 DL6617
 DL6617.The orthometric height was determined by differential leveling and
 DL6617.adjusted by the NATIONAL GEODETIC SURVEY
 DL6617.in October 2012.
 DL6617
 DL6617.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6617.GEOID18 height accuracy estimate available here.
 DL6617
 DL6617.Click photographs - Photos may exist for this station.
 DL6617
 DL6617.The dynamic height is computed by dividing the NAVD 88
 DL6617.geopotential number by the normal gravity value computed on the
 DL6617.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6617.degrees latitude (g = 980.6199 gals.).
 DL6617
 DL6617.The modeled gravity was interpolated from observed gravity values.
 DL6617
 DL6617
 DL6617_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2334206053(NAD 83)
 DL6617
 DL6617                          SUPERSEDED SURVEY CONTROL
 DL6617
 DL6617  NAVD 88 (04/20/10)    1.658  (m)            5.44   (f) SUPERSEDED  1 2
 DL6617
 DL6617.Superseded values are not recommended for survey control.
 DL6617
 DL6617.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 DL6617.See file dsdata.pdf to determine how the superseded data were derived.
 DL6617
 DL6617_MARKER: DD = SURVEY DISK
 DL6617_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DL6617_STAMPING: 801HV86023
 DL6617_MARK LOGO: NPS
 DL6617_PROJECTION: FLUSH
 DL6617_MAGNETIC: N = NO MAGNETIC MATERIAL
 DL6617_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DL6617+STABILITY: SURFACE MOTION
 DL6617_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 DL6617+SATELLITE: SATELLITE OBSERVATIONS - December 31, 2024
 DL6617
 DL6617  HISTORY     - Date     Condition        Report By
 DL6617  HISTORY     - UNK      MONUMENTED       NPS
 DL6617  HISTORY     - 200812   GOOD             NGS
 DL6617  HISTORY     - 20120301 GOOD             NGS
 DL6617  HISTORY     - 20220330 GOOD             NGS
 DL6617  HISTORY     - 20241231 GOOD             INDIV
 DL6617
 DL6617                          STATION DESCRIPTION
 DL6617
 DL6617'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6617'THE MARK IS LOCATED AT THE NORTHERN END OF PARKING LOT ALONG MAINE
 DL6617'AVENUE , ALONG SIDEWALK IN GRASS AREA BETWEEN PARKING LOT AND
 DL6617'SIDEWALK.
 DL6617'
 DL6617'THE MARK IS A NATIONAL PARK SERVICE DISK SET IN A CONCRETE POST.
 DL6617'
 DL6617'THE MARK IS 18.2 FT (5.5 M) EAST OF THE WEST EDGE OF THE TIDAL BASIN,
 DL6617'45.5 FT (13.9 M) NORTH OF A IRRIGATION CONTROL BOX AND 15.3 FT (4.7 M)
 DL6617'EAST OF THE PARKING LOT CURB.
 DL6617
 DL6617                          STATION RECOVERY (2012)
 DL6617
 DL6617'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DL6617'RECOVERED AS DESCRIBED.
 DL6617
 DL6617                          STATION RECOVERY (2022)
 DL6617
 DL6617'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2022 (GAS)
 DL6617'RECOVERED IN GOOD CONDITION.
 DL6617
 DL6617                          STATION RECOVERY (2024)
 DL6617
 DL6617'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2024 (EF)
 DL6617'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6616 ***********************************************************************
 DL6616  DESIGNATION -  801 HV86025
 DL6616  PID         -  DL6616
 DL6616  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6616  COUNTRY     -  US
 DL6616  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6616
 DL6616                         *CURRENT SURVEY CONTROL
 DL6616  ______________________________________________________________________
 DL6616* NAD 83(1986) POSITION- 38 53 04.05   (N) 077 02 02.44   (W)   HD_HELD1
 DL6616* NAVD 88 ORTHO HEIGHT -     2.145 (meters)        7.04  (feet) ADJUSTED
 DL6616  ______________________________________________________________________
 DL6616  GEOID HEIGHT    -        -32.100 (meters)                     GEOID18
 DL6616  DYNAMIC HEIGHT  -          2.144 (meters)        7.03  (feet) COMP
 DL6616  MODELED GRAVITY -    980,097.6   (mgal)                       NAVD 88
 DL6616
 DL6616  VERT ORDER      -  FIRST     CLASS II
 DL6616
 DL6616.The horizontal coordinates were determined by differentially corrected
 DL6616.hand held GPS observations or other comparable positioning techniques
 DL6616.and have an estimated accuracy of +/- 3 meters.
 DL6616
 DL6616.The orthometric height was determined by differential leveling and
 DL6616.adjusted by the NATIONAL GEODETIC SURVEY
 DL6616.in April 2010.
 DL6616
 DL6616.No vertical observational check was made to the station.
 DL6616
 DL6616.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6616.GEOID18 height accuracy estimate available here.
 DL6616
 DL6616.Click photographs - Photos may exist for this station.
 DL6616
 DL6616.The dynamic height is computed by dividing the NAVD 88
 DL6616.geopotential number by the normal gravity value computed on the
 DL6616.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6616.degrees latitude (g = 980.6199 gals.).
 DL6616
 DL6616.The modeled gravity was interpolated from observed gravity values.
 DL6616
 DL6616
 DL6616_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2357705921(NAD 83)
 DL6616
 DL6616                          SUPERSEDED SURVEY CONTROL
 DL6616
 DL6616.No superseded survey control is available for this station.
 DL6616
 DL6616_MARKER: DD = SURVEY DISK
 DL6616_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DL6616_STAMPING: 801HV86025
 DL6616_MARK LOGO: NPS
 DL6616_PROJECTION: FLUSH
 DL6616_MAGNETIC: N = NO MAGNETIC MATERIAL
 DL6616_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DL6616+STABILITY: SURFACE MOTION
 DL6616
 DL6616  HISTORY     - Date     Condition        Report By
 DL6616  HISTORY     - 1986     MONUMENTED       NPS
 DL6616  HISTORY     - 200812   GOOD             NGS
 DL6616  HISTORY     - 20120301 GOOD             NGS
 DL6616
 DL6616                          STATION DESCRIPTION
 DL6616
 DL6616'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6616'THE MARK IS LOCATED AT THE TIDAL BASIN ALONG THE SIDEWALK LEADING
 DL6616'NORTH BETWEEN THE PARKING LOT AND SIDEWALK IN GRASS AREA.
 DL6616'
 DL6616'THE MARK IS AN ALUMINUM DISK SET IN A CONCRETE POST FLUSH WITH THE
 DL6616'GROUND.
 DL6616'
 DL6616'THE MARK IS 18.2 FT (5.5 M) EAST OF THE WEST EDGE OF TIDAL BASIN, 45.5
 DL6616'FT (13.9 M) NORTH OF AN IRRIGATION CONTROL CONTROL BOX AND 15.3 FT
 DL6616'(4.7 M) WEST OF THE EAST EDGE OF PARKING LOT CURB.
 DL6616
 DL6616                          STATION RECOVERY (2012)
 DL6616
 DL6616'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DL6616'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6615 ***********************************************************************
 DL6615  DESIGNATION -  801 HV86026
 DL6615  PID         -  DL6615
 DL6615  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6615  COUNTRY     -  US
 DL6615  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6615
 DL6615                         *CURRENT SURVEY CONTROL
 DL6615  ______________________________________________________________________
 DL6615* NAD 83(1986) POSITION- 38 52 59.93   (N) 077 01 59.61   (W)   HD_HELD1
 DL6615* NAVD 88 ORTHO HEIGHT -     1.556 (meters)        5.11  (feet) ADJUSTED
 DL6615  ______________________________________________________________________
 DL6615  GEOID HEIGHT    -        -32.104 (meters)                     GEOID18
 DL6615  DYNAMIC HEIGHT  -          1.555 (meters)        5.10  (feet) COMP
 DL6615  MODELED GRAVITY -    980,097.6   (mgal)                       NAVD 88
 DL6615
 DL6615  VERT ORDER      -  FIRST     CLASS II
 DL6615
 DL6615.The horizontal coordinates were determined by differentially corrected
 DL6615.hand held GPS observations or other comparable positioning techniques
 DL6615.and have an estimated accuracy of +/- 3 meters.
 DL6615
 DL6615.The orthometric height was determined by differential leveling and
 DL6615.adjusted by the NATIONAL GEODETIC SURVEY
 DL6615.in October 2012.
 DL6615
 DL6615.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6615.GEOID18 height accuracy estimate available here.
 DL6615
 DL6615.Click photographs - Photos may exist for this station.
 DL6615
 DL6615.The dynamic height is computed by dividing the NAVD 88
 DL6615.geopotential number by the normal gravity value computed on the
 DL6615.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6615.degrees latitude (g = 980.6199 gals.).
 DL6615
 DL6615.The modeled gravity was interpolated from observed gravity values.
 DL6615
 DL6615
 DL6615_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2364205792(NAD 83)
 DL6615
 DL6615                          SUPERSEDED SURVEY CONTROL
 DL6615
 DL6615  NAVD 88 (04/20/10)    1.562  (m)            5.12   (f) SUPERSEDED  1 2
 DL6615
 DL6615.Superseded values are not recommended for survey control.
 DL6615
 DL6615.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 DL6615.See file dsdata.pdf to determine how the superseded data were derived.
 DL6615
 DL6615_MARKER: DD = SURVEY DISK
 DL6615_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DL6615_STAMPING: 801 HV86026
 DL6615_MARK LOGO: NPS
 DL6615_PROJECTION: FLUSH
 DL6615_MAGNETIC: N = NO MAGNETIC MATERIAL
 DL6615_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DL6615+STABILITY: SURFACE MOTION
 DL6615
 DL6615  HISTORY     - Date     Condition        Report By
 DL6615  HISTORY     - 1986     MONUMENTED       NPS
 DL6615  HISTORY     - 20081222 GOOD             NGS
 DL6615  HISTORY     - 20120301 GOOD             NGS
 DL6615
 DL6615                          STATION DESCRIPTION
 DL6615
 DL6615'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6615'THE MARK IS LOCATED AT JUNCTION OF MAINE AVENUE BASIN DRIVE ALONG THE
 DL6615'WALKWAY AT THE NORTHEAST SIDE IF TIDAL BASIN.
 DL6615'
 DL6615'THE MARK IS A NATIONAL PARK SERVICE ALUMINUM DISK SET IN A CONCRETE
 DL6615'POST.
 DL6615'
 DL6615'THE MARK IS 12.2 FT (3.7 M) EAST OF THE NORTHEAST EDGE OF TIDAL BASIN,
 DL6615'10.6 FT (3.2 M) NORTH OF A WATER METER COVER, 88.3 FT (26.9 M)
 DL6615'SOUTHWEST OF BASIN DRIVE.
 DL6615
 DL6615                          STATION RECOVERY (2012)
 DL6615
 DL6615'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DL6615'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6613 ***********************************************************************
 DL6613  DESIGNATION -  808 HV86006
 DL6613  PID         -  DL6613
 DL6613  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6613  COUNTRY     -  US
 DL6613  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6613
 DL6613                         *CURRENT SURVEY CONTROL
 DL6613  ______________________________________________________________________
 DL6613* NAD 83(1986) POSITION- 38 52 55.     (N) 077 02 01.     (W)   SCALED
 DL6613* NAVD 88 ORTHO HEIGHT -     1.449 (meters)        4.75  (feet) ADJUSTED
 DL6613  ______________________________________________________________________
 DL6613  GEOID HEIGHT    -        -32.106 (meters)                     GEOID18
 DL6613  DYNAMIC HEIGHT  -          1.449 (meters)        4.75  (feet) COMP
 DL6613  MODELED GRAVITY -    980,097.4   (mgal)                       NAVD 88
 DL6613
 DL6613  VERT ORDER      -  FIRST     CLASS II
 DL6613
 DL6613.The horizontal coordinates were scaled from a map and have
 DL6613.an estimated accuracy of +/- 6 seconds.
 DL6613
 DL6613.The orthometric height was determined by differential leveling and
 DL6613.adjusted by the NATIONAL GEODETIC SURVEY
 DL6613.in April 2010.
 DL6613
 DL6613.No vertical observational check was made to the station.
 DL6613
 DL6613.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6613.GEOID18 height accuracy estimate available here.
 DL6613
 DL6613.Click photographs - Photos may exist for this station.
 DL6613
 DL6613.The dynamic height is computed by dividing the NAVD 88
 DL6613.geopotential number by the normal gravity value computed on the
 DL6613.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6613.degrees latitude (g = 980.6199 gals.).
 DL6613
 DL6613.The modeled gravity was interpolated from observed gravity values.
 DL6613
 DL6613
 DL6613_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ236056(NAD 83)
 DL6613
 DL6613                          SUPERSEDED SURVEY CONTROL
 DL6613
 DL6613.No superseded survey control is available for this station.
 DL6613
 DL6613_MARKER: DD = SURVEY DISK
 DL6613_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DL6613_STAMPING: 808 HV86006
 DL6613_MARK LOGO: NPS
 DL6613_PROJECTION: FLUSH
 DL6613_MAGNETIC: N = NO MAGNETIC MATERIAL
 DL6613_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DL6613+STABILITY: SURFACE MOTION
 DL6613
 DL6613  HISTORY     - Date     Condition        Report By
 DL6613  HISTORY     - UNK      MONUMENTED       NPS
 DL6613  HISTORY     - 20081212 GOOD             NGS
 DL6613
 DL6613                          STATION DESCRIPTION
 DL6613
 DL6613'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6613'THE MARK IS LOCATED 0.13 MI (0.2 KM) SOUTHWEST OF THE JEFFERSON
 DL6613'MEMORIAL AT TOUR BUS STOP ON BASIN DRIVE IN GRASSY AREA NORTH OF BASIN
 DL6613'DRIVE.
 DL6613'
 DL6613'THE MARK IS A NATIONAL PARK SERVICE DISK SET IN A CONCRETE POST.
 DL6613'
 DL6613'THE MARK IS 18 FT (5.5 M) WEST OF TOUR BUS INFORMATION SIGN, 17.4 FT
 DL6613'(5.3 M) NORTH OF THE SOUTH EDGE OF BASIN DRIVE, 8.3 FT (2.5 M) EAST OF
 DL6613'A STEEL SEWER COVER, AND 2.7 FT (0.8 M) NORTH OF A CONCRETE K-RAIL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6609 ***********************************************************************
 DL6609  DESIGNATION -  808 HV89003
 DL6609  PID         -  DL6609
 DL6609  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6609  COUNTRY     -  US
 DL6609  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6609
 DL6609                         *CURRENT SURVEY CONTROL
 DL6609  ______________________________________________________________________
 DL6609* NAD 83(1986) POSITION- 38 52 47.84   (N) 077 02 16.44   (W)   HD_HELD1
 DL6609* NAVD 88 ORTHO HEIGHT -     3.105 (meters)       10.19  (feet) ADJUSTED
 DL6609  ______________________________________________________________________
 DL6609  GEOID HEIGHT    -        -32.103 (meters)                     GEOID18
 DL6609  DYNAMIC HEIGHT  -          3.104 (meters)       10.18  (feet) COMP
 DL6609  MODELED GRAVITY -    980,096.9   (mgal)                       NAVD 88
 DL6609
 DL6609  VERT ORDER      -  FIRST     CLASS II
 DL6609
 DL6609.The horizontal coordinates were determined by differentially corrected
 DL6609.hand held GPS observations or other comparable positioning techniques
 DL6609.and have an estimated accuracy of +/- 3 meters.
 DL6609
 DL6609.The orthometric height was determined by differential leveling and
 DL6609.adjusted by the NATIONAL GEODETIC SURVEY
 DL6609.in October 2012.
 DL6609
 DL6609.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6609.GEOID18 height accuracy estimate available here.
 DL6609
 DL6609.Click photographs - Photos may exist for this station.
 DL6609
 DL6609.The dynamic height is computed by dividing the NAVD 88
 DL6609.geopotential number by the normal gravity value computed on the
 DL6609.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6609.degrees latitude (g = 980.6199 gals.).
 DL6609
 DL6609.The modeled gravity was interpolated from observed gravity values.
 DL6609
 DL6609
 DL6609_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2322805428(NAD 83)
 DL6609
 DL6609                          SUPERSEDED SURVEY CONTROL
 DL6609
 DL6609  NAVD 88 (04/20/10)    3.117  (m)           10.23   (f) SUPERSEDED  1 2
 DL6609
 DL6609.Superseded values are not recommended for survey control.
 DL6609
 DL6609.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 DL6609.See file dsdata.pdf to determine how the superseded data were derived.
 DL6609
 DL6609_MARKER: DD = SURVEY DISK
 DL6609_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DL6609_STAMPING: 808 HV89003
 DL6609_MARK LOGO: NPS
 DL6609_PROJECTION: FLUSH
 DL6609_MAGNETIC: N = NO MAGNETIC MATERIAL
 DL6609_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DL6609+STABILITY: SURFACE MOTION
 DL6609
 DL6609  HISTORY     - Date     Condition        Report By
 DL6609  HISTORY     - UNK      MONUMENTED       NPS
 DL6609  HISTORY     - 20081223 GOOD             NGS
 DL6609  HISTORY     - 20120301 GOOD             NGS
 DL6609
 DL6609                          STATION DESCRIPTION
 DL6609
 DL6609'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6609'THE MARK IS LOCATED 0.13 MI (0.2 KM) SOUTHWEST OF THE JEFFERSON
 DL6609'MEMORIAL AT A TOUR BUS STOP ON BASIN DRIVE IN A GRASSY AREA NORTH OF
 DL6609'BASIN DRIVE.
 DL6609'
 DL6609'THE MARK IS A NATIONAL PARK SERVICE DISK SET IN A CONCRETE POST 18 FT
 DL6609'(5.5 M) WEST OF A TOUR BUS INFORMATION SIGN, 17.4 FT (5.3 M) NORTH OF
 DL6609'THE SOUTH EDGE OF BASIN DRIVE, 8.3 FT (2.5 M) EAST OF A STEEL SEWER
 DL6609'COVER AND 2.7 FT (0.8 M) NORTH OF A CONCRETE K-RAIL.
 DL6609
 DL6609                          STATION RECOVERY (2012)
 DL6609
 DL6609'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DL6609'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6619 ***********************************************************************
 DL6619  DESIGNATION -  809 HV83001
 DL6619  PID         -  DL6619
 DL6619  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6619  COUNTRY     -  US
 DL6619  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6619
 DL6619                         *CURRENT SURVEY CONTROL
 DL6619  ______________________________________________________________________
 DL6619* NAD 83(1986) POSITION- 38 53 29.42   (N) 077 01 56.88   (W)   HD_HELD1
 DL6619* NAVD 88 ORTHO HEIGHT -     2.958 (meters)        9.70  (feet) ADJUSTED
 DL6619  ______________________________________________________________________
 DL6619  GEOID HEIGHT    -        -32.088 (meters)                     GEOID18
 DL6619  DYNAMIC HEIGHT  -          2.957 (meters)        9.70  (feet) COMP
 DL6619  MODELED GRAVITY -    980,098.3   (mgal)                       NAVD 88
 DL6619
 DL6619  VERT ORDER      -  FIRST     CLASS II
 DL6619
 DL6619.The horizontal coordinates were determined by differentially corrected
 DL6619.hand held GPS observations or other comparable positioning techniques
 DL6619.and have an estimated accuracy of +/- 3 meters.
 DL6619
 DL6619.The orthometric height was determined by differential leveling and
 DL6619.adjusted by the NATIONAL GEODETIC SURVEY
 DL6619.in April 2010.
 DL6619
 DL6619.No vertical observational check was made to the station.
 DL6619
 DL6619.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6619.GEOID18 height accuracy estimate available here.
 DL6619
 DL6619.Click photographs - Photos may exist for this station.
 DL6619
 DL6619.The dynamic height is computed by dividing the NAVD 88
 DL6619.geopotential number by the normal gravity value computed on the
 DL6619.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6619.degrees latitude (g = 980.6199 gals.).
 DL6619
 DL6619.The modeled gravity was interpolated from observed gravity values.
 DL6619
 DL6619
 DL6619_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2372806700(NAD 83)
 DL6619
 DL6619                          SUPERSEDED SURVEY CONTROL
 DL6619
 DL6619.No superseded survey control is available for this station.
 DL6619
 DL6619_MARKER: DD = SURVEY DISK
 DL6619_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DL6619_STAMPING: 809HV83001
 DL6619_MARK LOGO: NPS
 DL6619_PROJECTION: FLUSH
 DL6619_MAGNETIC: M = MARKER EQUIPPED WITH BAR MAGNET
 DL6619_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DL6619+STABILITY: SURFACE MOTION
 DL6619
 DL6619  HISTORY     - Date     Condition        Report By
 DL6619  HISTORY     - 1983     MONUMENTED       NPS
 DL6619  HISTORY     - 20081222 GOOD             NGS
 DL6619
 DL6619                          STATION DESCRIPTION
 DL6619
 DL6619'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6619'THE MARK IS LOCATED IN THE NORTHWEST QUADRANT OF WASHINGTON, DC, AT
 DL6619'THE JUNCTION OF CONSTITUTION AVENUE AND 14TH STREET, IN A GRASSY AREA
 DL6619'BETWEEN 14TH STREET AND 15TH STREET AT THE INTERSECTION OF TWO
 DL6619'SIDEWALKS JUST SOUTH OF THE EAST WEST SIDEWALK ABOUT.20 MI NORTHEAST
 DL6619'OF THE WASHINGTON MONUMENT.
 DL6619'
 DL6619'THE MARK IS A NATIONAL PARK SERVICE DISK SET IN A CONCRETE POST.
 DL6619'
 DL6619'THE MARK IS 11.8 FT (3.6 M) SOUTHWEST OF THE SOUTH EDGE OF A EAST WEST
 DL6619'SIDEWALK, 27.8 FT (8.5 M) WEST OF EAST EDGE OF THE NORTH SOUTH
 DL6619'SIDEWALK AND 8.3 FT (2.5 M) EAST OF A TREE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1836 ***********************************************************************
 HV1836  DESIGNATION -  82
 HV1836  PID         -  HV1836
 HV1836  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1836  COUNTRY     -  US
 HV1836  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1836
 HV1836                         *CURRENT SURVEY CONTROL
 HV1836  ______________________________________________________________________
 HV1836* NAD 83(1986) POSITION- 38 53 26.     (N) 077 01 32.     (W)   SCALED
 HV1836* NAVD 88 ORTHO HEIGHT -     8.782 (meters)       28.81  (feet) POSTED
 HV1836  ______________________________________________________________________
 HV1836  GEOID HEIGHT    -        -32.099 (meters)                     GEOID18
 HV1836  DYNAMIC HEIGHT  -          8.78  (meters)       28.8   (feet) COMP
 HV1836  MODELED GRAVITY -    980,099.3   (mgal)                       NAVD 88
 HV1836
 HV1836  VERT ORDER      -  * POSTED, SEE BELOW
 HV1836
 HV1836.The horizontal coordinates were scaled from a map and have
 HV1836.an estimated accuracy of +/- 6 seconds.
 HV1836
 HV1836.The orthometric height was determined by differential leveling
 HV1836.and adjusted by the NATIONAL GEODETIC SURVEY in 1992.
 HV1836
 HV1836.* This is a POSTED BENCH MARK height.
 HV1836
 HV1836.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1836.GEOID18 height accuracy estimate available here.
 HV1836
 HV1836.Click photographs - Photos may exist for this station.
 HV1836
 HV1836.The dynamic height is computed by dividing the NAVD 88
 HV1836.geopotential number by the normal gravity value computed on the
 HV1836.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1836.degrees latitude (g = 980.6199 gals.).
 HV1836
 HV1836.The modeled gravity was interpolated from observed gravity values.
 HV1836
 HV1836
 HV1836_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ243065(NAD 83)
 HV1836
 HV1836                          SUPERSEDED SURVEY CONTROL
 HV1836
 HV1836  NGVD 29 (11/26/84)    9.022  (m)           29.60   (f) ADJUSTED    1 2
 HV1836
 HV1836.Superseded values are not recommended for survey control.
 HV1836
 HV1836.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1836.See file dsdata.pdf to determine how the superseded data were derived.
 HV1836
 HV1836_MARKER: X = CHISELED CROSS
 HV1836_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1836_SP_SET: SILL
 HV1836_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1836
 HV1836  HISTORY     - Date     Condition        Report By
 HV1836  HISTORY     - 1894     MONUMENTED       CGS
 HV1836  HISTORY     - 1914     GOOD             CGS
 HV1836  HISTORY     - 1941     GOOD             CGS
 HV1836  HISTORY     - 1978     MARK NOT FOUND   DMA
 HV1836  HISTORY     - 20090317 MARK NOT FOUND   GEOCAC
 HV1836
 HV1836                          STATION DESCRIPTION
 HV1836
 HV1836'DESCRIBED BY COAST AND GEODETIC SURVEY 1914
 HV1836'AT WASHINGTON.
 HV1836'AT WASHINGTON, AT THE OLD NATIONAL MUSEUM, AT THE NORTH (MAIN)
 HV1836'ENTRANCE, 3 FEET EAST OF THE WEST BRICK WALL OF THE BUILDING,
 HV1836'AT THE FOOT OF THE WEST JAMB OF THE CENTRAL DOUBLE OUTER DOOR,
 HV1836'1 INCH EAST OF THE WOODEN DOOR JAMB, AND ON THE TOP OF THE
 HV1836'GRANITE SILL.  A CHISELED CROSS.
 HV1836
 HV1836                          STATION RECOVERY (1941)
 HV1836
 HV1836'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1941
 HV1836'RECOVERED IN GOOD CONDITION.
 HV1836
 HV1836                          STATION RECOVERY (1978)
 HV1836
 HV1836'RECOVERY NOTE BY DEFENSE MAP AGENCY 1978
 HV1836'MARK NOT FOUND.
 HV1836
 HV1836                          STATION RECOVERY (2009)
 HV1836
 HV1836'RECOVERY NOTE BY GEOCACHING 2009 (LPC)
 HV1836'WE SEARCHED CAREFULLY BUT WERE UNABLE TO FIND THIS MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1837 ***********************************************************************
 HV1837  DESIGNATION -  84=SMITHSONIAN
 HV1837  PID         -  HV1837
 HV1837  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1837  COUNTRY     -  US
 HV1837  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1837
 HV1837                         *CURRENT SURVEY CONTROL
 HV1837  ______________________________________________________________________
 HV1837* NAD 83(1986) POSITION- 38 53 19.9    (N) 077 01 31.7    (W)   HD_HELD2
 HV1837* NAVD 88 ORTHO HEIGHT -     9.311 (meters)       30.55  (feet) ADJUSTED
 HV1837  ______________________________________________________________________
 HV1837  GEOID HEIGHT    -        -32.103 (meters)                     GEOID18
 HV1837  DYNAMIC HEIGHT  -          9.306 (meters)       30.53  (feet) COMP
 HV1837  MODELED GRAVITY -    980,099.5   (mgal)                       NAVD 88
 HV1837
 HV1837  VERT ORDER      -  FIRST     CLASS II
 HV1837
 HV1837.The horizontal coordinates were established by autonomous hand held GPS
 HV1837.observations and have an estimated accuracy of +/- 10 meters.
 HV1837
 HV1837.The orthometric height was determined by differential leveling and
 HV1837.adjusted by the NATIONAL GEODETIC SURVEY
 HV1837.in October 2012.
 HV1837
 HV1837.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1837.GEOID18 height accuracy estimate available here.
 HV1837
 HV1837.Click photographs - Photos may exist for this station.
 HV1837
 HV1837.The dynamic height is computed by dividing the NAVD 88
 HV1837.geopotential number by the normal gravity value computed on the
 HV1837.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1837.degrees latitude (g = 980.6199 gals.).
 HV1837
 HV1837.The modeled gravity was interpolated from observed gravity values.
 HV1837
 HV1837
 HV1837_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2432806393(NAD 83)
 HV1837
 HV1837                          SUPERSEDED SURVEY CONTROL
 HV1837
 HV1837  NAVD 88 (06/15/91)    9.321  (m)           30.58   (f) SUPERSEDED  1 2
 HV1837  NGVD 29 (11/26/84)    9.560  (m)           31.36   (f) ADJUSTED    1 2
 HV1837
 HV1837.Superseded values are not recommended for survey control.
 HV1837
 HV1837.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1837.See file dsdata.pdf to determine how the superseded data were derived.
 HV1837
 HV1837_MARKER: X = CHISELED CROSS
 HV1837_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
 HV1837_SP_SET: STONE WALL
 HV1837_MARK LOGO: NONE
 HV1837_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1837+STABILITY: SURFACE MOTION
 HV1837_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1837+SATELLITE: SATELLITE OBSERVATIONS - December 11, 2021
 HV1837
 HV1837  HISTORY     - Date     Condition        Report By
 HV1837  HISTORY     - 1894     MONUMENTED       CGS
 HV1837  HISTORY     - 1941     GOOD             CGS
 HV1837  HISTORY     - 1941     GOOD             CGS
 HV1837  HISTORY     - 1978     GOOD             DMA
 HV1837  HISTORY     - 20050713 GOOD             GEOCAC
 HV1837  HISTORY     - 20090319 GOOD             GEOCAC
 HV1837  HISTORY     - 20120301 GOOD             NGS
 HV1837  HISTORY     - 20180717 GOOD             USPSQD
 HV1837  HISTORY     - 20211211 GOOD             USPSQD
 HV1837
 HV1837                          STATION DESCRIPTION
 HV1837
 HV1837'DESCRIBED BY COAST AND GEODETIC SURVEY 1941
 HV1837'AT WASHINGTON.
 HV1837'AT WASHINGTON, AT THE SMITHSONIAN INSTITUTION, AT THE NORTHEAST
 HV1837'CORNER OF THE BUILDING, OPPOSITE THE MIDDLE OF THE FIRST
 HV1837'BASEMENT WINDOW WEST OF THE CORNER, AND ON THE TOP OF THE
 HV1837'STONE AREA WALL.  A CHISELED CROSS.
 HV1837
 HV1837                          STATION RECOVERY (1941)
 HV1837
 HV1837'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1941
 HV1837'RECOVERED IN GOOD CONDITION.
 HV1837
 HV1837                          STATION RECOVERY (1978)
 HV1837
 HV1837'RECOVERY NOTE BY DEFENSE MAP AGENCY 1978
 HV1837'RECOVERED IN GOOD CONDITION.
 HV1837
 HV1837                          STATION RECOVERY (2005)
 HV1837
 HV1837'RECOVERY NOTE BY GEOCACHING 2005 (PR)
 HV1837'FOUND BY DESCRIPTION. AT THE SMITHSONIAN CASTLE. AT THE NORTHEAST
 HV1837'CORNER, FIRST BASEMENT WINDOW TO THE WEST. ON THE LINTEL OF THE WALL
 HV1837'ACROSS THE WINDOW WELL.
 HV1837
 HV1837                          STATION RECOVERY (2009)
 HV1837
 HV1837'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV1837'RECOVERED IN GOOD CONDITION.
 HV1837
 HV1837                          STATION RECOVERY (2012)
 HV1837
 HV1837'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1837'RECOVERED AS DESCRIBED.
 HV1837
 HV1837                          STATION RECOVERY (2018)
 HV1837
 HV1837'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV1837'RECOVERED IN GOOD CONDITION.
 HV1837
 HV1837                          STATION RECOVERY (2021)
 HV1837
 HV1837'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 HV1837'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1980 ***********************************************************************
 HV1980  TIDAL BM    -  This is a Tidal Bench Mark.
 HV1980  DESIGNATION -  859 4900 1
 HV1980  PID         -  HV1980
 HV1980  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1980  COUNTRY     -  US
 HV1980  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1980
 HV1980                         *CURRENT SURVEY CONTROL
 HV1980  ______________________________________________________________________
 HV1980* NAD 83(1986) POSITION- 38 52 29.40   (N) 077 01 15.53   (W)   HD_HELD1
 HV1980* NAVD 88 ORTHO HEIGHT -     2.311 (meters)        7.58  (feet) ADJUSTED
 HV1980  ______________________________________________________________________
 HV1980  GEOID HEIGHT    -        -32.138 (meters)                     GEOID18
 HV1980  DYNAMIC HEIGHT  -          2.310 (meters)        7.58  (feet) COMP
 HV1980  MODELED GRAVITY -    980,097.3   (mgal)                       NAVD 88
 HV1980
 HV1980  VERT ORDER      -  FIRST     CLASS II
 HV1980
 HV1980.The horizontal coordinates were determined by differentially corrected
 HV1980.hand held GPS observations or other comparable positioning techniques
 HV1980.and have an estimated accuracy of +/- 3 meters.
 HV1980
 HV1980.The orthometric height was determined by differential leveling and
 HV1980.adjusted by the NATIONAL GEODETIC SURVEY
 HV1980.in April 2010.
 HV1980
 HV1980.No vertical observational check was made to the station.
 HV1980
 HV1980.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1980.GEOID18 height accuracy estimate available here.
 HV1980
 HV1980.This Tidal Bench Mark is designated as VM 456
 HV1980.by the CENTER FOR OPERATIONAL OCEANOGRAPHIC PRODUCTS AND SERVICES.
 HV1980
 HV1980.Click photographs - Photos may exist for this station.
 HV1980
 HV1980.The dynamic height is computed by dividing the NAVD 88
 HV1980.geopotential number by the normal gravity value computed on the
 HV1980.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1980.degrees latitude (g = 980.6199 gals.).
 HV1980
 HV1980.The modeled gravity was interpolated from observed gravity values.
 HV1980
 HV1980
 HV1980_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2468404827(NAD 83)
 HV1980
 HV1980                          SUPERSEDED SURVEY CONTROL
 HV1980
 HV1980  NAVD 88 (06/15/91)    2.302  (m)            7.55   (f) SUPERSEDED  1 1
 HV1980  NGVD 29 (08/12/92)    2.540  (m)            8.33   (f) ADJUSTED    1 1
 HV1980  NGVD 29 (??/??/87)    2.540  (m)            8.33   (f) SUPERSEDED  1 1
 HV1980
 HV1980.Superseded values are not recommended for survey control.
 HV1980
 HV1980.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1980.See file dsdata.pdf to determine how the superseded data were derived.
 HV1980
 HV1980_STAMPING: TIDAL NO 1 1951
 HV1980_MARK LOGO: CGS
 HV1980_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1980+SATELLITE: SATELLITE OBSERVATIONS - April 05, 2012
 HV1980
 HV1980  HISTORY     - Date     Condition        Report By
 HV1980  HISTORY     - 1951     MONUMENTED       CGS
 HV1980  HISTORY     - 1972     GOOD             NGS
 HV1980  HISTORY     - 19920512 GOOD             NGS
 HV1980  HISTORY     - 20020902 GOOD             INDIV
 HV1980  HISTORY     - 20081124 GOOD             NGS
 HV1980  HISTORY     - 20100314 GOOD             GEOCAC
 HV1980  HISTORY     - 20120405 GOOD             NGS
 HV1980  HISTORY     - 20180413 MARK NOT FOUND   NGS
 HV1980
 HV1980                          STATION DESCRIPTION
 HV1980
 HV1980'DESCRIBED BY NATIONAL GEODETIC SURVEY 1972
 HV1980'AT WASHINGTON DC.
 HV1980'AT WASHINGTON, D.C., ALONG WATER STREET NEAR THE EXTENDED CENTER
 HV1980'LINE OF SW N STREET, NEAR THE NORTHEAST CORNER OF PIER 4 OF THE
 HV1980'WILSON BOAT LINE, 45.7 FEET SOUTHWEST OF THE SOUTHWEST CURB FOR
 HV1980'WATER STREET, 18.2 FEET EAST-SOUTHEAST OF THE CENTER OF THE
 HV1980'SOUTHEAST GATE FOR PIER 4, 5.6 FEET SOUTHEAST OF THE EAST CORNER
 HV1980'OF THE FIRST BRICK GATEPOST SOUTHEAST OF THE SOUTHEAST GATE, SET
 HV1980'IN TOP OF THE CONCRETE SEAWALL ALONG THE EAST SIDE OF WASHINGTON
 HV1980'CHANNEL AND ABOUT 1/2 FOOT ABOVE THE LEVEL OF THE PARKING AREA.
 HV1980
 HV1980                          STATION RECOVERY (1992)
 HV1980
 HV1980'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1980'IN WASHINGTON, D.C., AT 6TH AND WATER STREET, IN A CONCRETE SEAWALL
 HV1980'ALONG THE EAST BANK OF THE WASHINGTON CHANNEL, 13.9 M (45.6 FT)
 HV1980'SOUTHWEST OF THE CENTER OF WATER STREET, 5.5 M (18.0 FT) SOUTHEAST OF
 HV1980'THE CENTER OF THE SOUTH GATE LEADING TO THE SPIRIT OF WASHINGTON
 HV1980'CRUISES (PIER 4), 1.7 M (5.6 FT) SOUTHEAST OF THE EAST CORNER OF THE
 HV1980'FIRST BRICK PILLAR SOUTHEAST OF THE SOUTHEAST GATE, AND LEVEL WITH
 HV1980'THE STREET.
 HV1980
 HV1980                          STATION RECOVERY (2002)
 HV1980
 HV1980'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 HV1980'RECOVERED IN GOOD CONDITION.
 HV1980
 HV1980                          STATION RECOVERY (2008)
 HV1980
 HV1980'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV1980'RECOVERED AS DESCRIBED.
 HV1980
 HV1980                          STATION RECOVERY (2010)
 HV1980
 HV1980'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 HV1980'RECOVERED IN GOOD CONDITION.
 HV1980
 HV1980                          STATION RECOVERY (2012)
 HV1980
 HV1980'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1980'RECOVERED IN GOOD CONDITION.
 HV1980
 HV1980                          STATION RECOVERY (2018)
 HV1980
 HV1980'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2018 (JE)
 HV1980'THE MARK LOCATION IS NOW BURIED UNDER 8 INCHES (20 CM) OF NEW CONCRETE
 HV1980'SEA WALL CAP.  NEW TIDAL BENCH MARKS WERE SET IN 2014 AND 2017.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9069 ***********************************************************************
 HV9069  TIDAL BM    -  This is a Tidal Bench Mark.
 HV9069  DESIGNATION -  859 4900 5
 HV9069  PID         -  HV9069
 HV9069  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9069  COUNTRY     -  US
 HV9069  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9069
 HV9069                         *CURRENT SURVEY CONTROL
 HV9069  ______________________________________________________________________
 HV9069* NAD 83(1986) POSITION- 38 52 30.29   (N) 077 01 16.00   (W)   HD_HELD1
 HV9069* NAVD 88 ORTHO HEIGHT -     2.317 (meters)        7.60  (feet) ADJUSTED
 HV9069  ______________________________________________________________________
 HV9069  GEOID HEIGHT    -        -32.137 (meters)                     GEOID18
 HV9069  DYNAMIC HEIGHT  -          2.316 (meters)        7.60  (feet) COMP
 HV9069  MODELED GRAVITY -    980,097.4   (mgal)                       NAVD 88
 HV9069
 HV9069  VERT ORDER      -  FIRST     CLASS II
 HV9069
 HV9069.The horizontal coordinates were determined by differentially corrected
 HV9069.hand held GPS observations or other comparable positioning techniques
 HV9069.and have an estimated accuracy of +/- 3 meters.
 HV9069
 HV9069.The orthometric height was determined by differential leveling and
 HV9069.adjusted by the NATIONAL GEODETIC SURVEY
 HV9069.in April 2010.
 HV9069
 HV9069.No vertical observational check was made to the station.
 HV9069
 HV9069.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9069.GEOID18 height accuracy estimate available here.
 HV9069
 HV9069.This Tidal Bench Mark is designated as VM 459
 HV9069.by the CENTER FOR OPERATIONAL OCEANOGRAPHIC PRODUCTS AND SERVICES.
 HV9069
 HV9069.Click photographs - Photos may exist for this station.
 HV9069
 HV9069.The dynamic height is computed by dividing the NAVD 88
 HV9069.geopotential number by the normal gravity value computed on the
 HV9069.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV9069.degrees latitude (g = 980.6199 gals.).
 HV9069
 HV9069.The modeled gravity was interpolated from observed gravity values.
 HV9069
 HV9069
 HV9069_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2467304855(NAD 83)
 HV9069
 HV9069                          SUPERSEDED SURVEY CONTROL
 HV9069
 HV9069  NAVD 88 (02/03/93)    2.309  (m)            7.58   (f) SUPERSEDED  1 2
 HV9069  NGVD 29 (08/12/92)    2.545  (m)            8.35   (f) ADJUSTED    1 2
 HV9069
 HV9069.Superseded values are not recommended for survey control.
 HV9069
 HV9069.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9069.See file dsdata.pdf to determine how the superseded data were derived.
 HV9069
 HV9069_STAMPING: NO 5 1973
 HV9069_MARK LOGO: CGS
 HV9069_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9069+SATELLITE: SATELLITE OBSERVATIONS - April 05, 2012
 HV9069
 HV9069  HISTORY     - Date     Condition        Report By
 HV9069  HISTORY     - 1973     MONUMENTED       NOS
 HV9069  HISTORY     - 19920512 GOOD             NGS
 HV9069  HISTORY     - 20081124 GOOD             NGS
 HV9069  HISTORY     - 20100314 GOOD             GEOCAC
 HV9069  HISTORY     - 20120405 GOOD             NGS
 HV9069  HISTORY     - 20180413 MARK NOT FOUND   NGS
 HV9069  HISTORY     - 20230823 MARK NOT FOUND   WHG
 HV9069
 HV9069                          STATION DESCRIPTION
 HV9069
 HV9069'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9069'IN WASHINGTON, D.C., AT 6TH AND WATER STREET, IN A CONCRETE SEAWALL
 HV9069'ALONG THE EAST BANK OF THE WASHINGTON CHANNEL, 13.9 M (45.6 FT)
 HV9069'SOUTHWEST OF THE CENTER OF WATER STREET, 3.6 M (11.8 FT) NORTHWEST OF
 HV9069'THE CENTER OF THE NORTH GATE LEADING TO THE SPIRIT OF WASHINGTON
 HV9069'CRUISES (PIER 4), 0.45 M (1.48 FT) NORTHWEST OF THE NORTHWEST CORNER
 HV9069'OF THE FIRST BRICK PILLAR NORTHWEST OF THE NORTHWEST GATE, AND LEVEL
 HV9069'WITH THE STREET.
 HV9069
 HV9069                          STATION RECOVERY (2008)
 HV9069
 HV9069'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV9069'RECOVERED AS DESCRIBED.
 HV9069
 HV9069                          STATION RECOVERY (2010)
 HV9069
 HV9069'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 HV9069'RECOVERED IN GOOD CONDITION.
 HV9069
 HV9069                          STATION RECOVERY (2012)
 HV9069
 HV9069'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV9069'RECOVERED IN GOOD CONDITION.
 HV9069
 HV9069                          STATION RECOVERY (2018)
 HV9069
 HV9069'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2018 (JE)
 HV9069'MARK LOCATION IS NOW BURIED UNDER 8 INCHES (20 CM) OF NEW CONCRETE SEA
 HV9069'WALL CAP.  NEW TIDAL BENCH MARKS WERE SET IN 2014 AND 2017.
 HV9069
 HV9069                          STATION RECOVERY (2023)
 HV9069
 HV9069'RECOVERY NOTE BY WOODS HOLE GROUP INC 2023 (DRW)
 HV9069'THE PORTION OF THE SEAWALL WHERE THE BENCH MARK IS LOCATED HAS BEEN
 HV9069'REBUILT RECENTLY.  THIS MARK IS ASSUMED TO BE DESTROYED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6628 ***********************************************************************
 DL6628  DESIGNATION -  859 4900 C
 DL6628  PID         -  DL6628
 DL6628  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6628  COUNTRY     -  US
 DL6628  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6628
 DL6628                         *CURRENT SURVEY CONTROL
 DL6628  ______________________________________________________________________
 DL6628* NAD 83(1986) POSITION- 38 52 41.76   (N) 077 01 25.26   (W)   HD_HELD1
 DL6628* NAVD 88 ORTHO HEIGHT -     5.656 (meters)       18.56  (feet) ADJUSTED
 DL6628  ______________________________________________________________________
 DL6628  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 DL6628  DYNAMIC HEIGHT  -          5.653 (meters)       18.55  (feet) COMP
 DL6628  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 DL6628
 DL6628  VERT ORDER      -  FIRST     CLASS II
 DL6628
 DL6628.The horizontal coordinates were determined by differentially corrected
 DL6628.hand held GPS observations or other comparable positioning techniques
 DL6628.and have an estimated accuracy of +/- 3 meters.
 DL6628
 DL6628.The orthometric height was determined by differential leveling and
 DL6628.adjusted by the NATIONAL GEODETIC SURVEY
 DL6628.in April 2010.
 DL6628
 DL6628.No vertical observational check was made to the station.
 DL6628
 DL6628.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6628.GEOID18 height accuracy estimate available here.
 DL6628
 DL6628.Click photographs - Photos may exist for this station.
 DL6628
 DL6628.The dynamic height is computed by dividing the NAVD 88
 DL6628.geopotential number by the normal gravity value computed on the
 DL6628.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6628.degrees latitude (g = 980.6199 gals.).
 DL6628
 DL6628.The modeled gravity was interpolated from observed gravity values.
 DL6628
 DL6628
 DL6628_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2445805214(NAD 83)
 DL6628
 DL6628                          SUPERSEDED SURVEY CONTROL
 DL6628
 DL6628.No superseded survey control is available for this station.
 DL6628
 DL6628_STAMPING: 4900 C 1977
 DL6628_MARK LOGO: NOS
 DL6628
 DL6628  HISTORY     - Date     Condition        Report By
 DL6628  HISTORY     - 1977     MONUMENTED       NOS
 DL6628  HISTORY     - 20081124 GOOD             NGS
 DL6628  HISTORY     - 20180513 MARK NOT FOUND   NGS
 DL6628
 DL6628                          STATION DESCRIPTION
 DL6628
 DL6628'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6628'THE BENCH MARK IS A DISK SET IN THE NORTHWEST CORNER OF A CONCRETE
 DL6628'RETAINING WALL BORDERING THE ENTRANCE TO AN UNDERGROUND PARKING LOT
 DL6628'JUST SOUTH OF THE BUILDING AT 700 WATER STREET.
 DL6628'
 DL6628'THE MARK IS 68.4 FT (20.8 M) SOUTH-SOUTHEAST OF THE SOUTH WALL OF THE
 DL6628'BUILDING, 61.0 FT (18.6 M) NORTH OF A BELL IN THE PARK AREA SOUTHEAST
 DL6628'OF THE PARKING LOT ENTRANCE, 19.1 FT (5.8 M) NORTH OF THE SOUTHWEST
 DL6628'CORNER OF THE RETAINING WALL, AND 4.5 FT (1.4 M) ABOVE THE PARKING LOT
 DL6628'ENTRANCE.
 DL6628
 DL6628                          STATION RECOVERY (2018)
 DL6628
 DL6628'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2018 (JE)
 DL6628'EXISTENCE DOUBTFUL DUE TO MAJOR RECONSTRUCTION IN THE AREA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6627 ***********************************************************************
 DL6627  DESIGNATION -  859 4900 H
 DL6627  PID         -  DL6627
 DL6627  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6627  COUNTRY     -  US
 DL6627  USGS QUAD   -  ALEXANDRIA (2019)
 DL6627
 DL6627                         *CURRENT SURVEY CONTROL
 DL6627  ______________________________________________________________________
 DL6627* NAD 83(1986) POSITION- 38 52 26.03   (N) 077 01 15.35   (W)   HD_HELD1
 DL6627* NAVD 88 ORTHO HEIGHT -     2.348 (meters)        7.70  (feet) ADJUSTED
 DL6627  ______________________________________________________________________
 DL6627  GEOID HEIGHT    -        -32.140 (meters)                     GEOID18
 DL6627  DYNAMIC HEIGHT  -          2.347 (meters)        7.70  (feet) COMP
 DL6627  MODELED GRAVITY -    980,097.2   (mgal)                       NAVD 88
 DL6627
 DL6627  VERT ORDER      -  FIRST     CLASS II
 DL6627
 DL6627.The horizontal coordinates were determined by differentially corrected
 DL6627.hand held GPS observations or other comparable positioning techniques
 DL6627.and have an estimated accuracy of +/- 3 meters.
 DL6627
 DL6627.The orthometric height was determined by differential leveling and
 DL6627.adjusted by the NATIONAL GEODETIC SURVEY
 DL6627.in October 2012.
 DL6627
 DL6627.No vertical observational check was made to the station.
 DL6627
 DL6627.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6627.GEOID18 height accuracy estimate available here.
 DL6627
 DL6627.Click photographs - Photos may exist for this station.
 DL6627
 DL6627.The dynamic height is computed by dividing the NAVD 88
 DL6627.geopotential number by the normal gravity value computed on the
 DL6627.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6627.degrees latitude (g = 980.6199 gals.).
 DL6627
 DL6627.The modeled gravity was interpolated from observed gravity values.
 DL6627
 DL6627
 DL6627_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2468604723(NAD 83)
 DL6627
 DL6627                          SUPERSEDED SURVEY CONTROL
 DL6627
 DL6627  NAVD 88 (04/20/10)    2.349  (m)            7.71   (f) SUPERSEDED  1 2
 DL6627
 DL6627.Superseded values are not recommended for survey control.
 DL6627
 DL6627.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 DL6627.See file dsdata.pdf to determine how the superseded data were derived.
 DL6627
 DL6627_MARKER: DB = BENCH MARK DISK
 DL6627_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 DL6627_SP_SET: DECK
 DL6627_STAMPING: 4900 H 1989
 DL6627_MARK LOGO: NOS
 DL6627_MAGNETIC: N = NO MAGNETIC MATERIAL
 DL6627_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 DL6627
 DL6627  HISTORY     - Date     Condition        Report By
 DL6627  HISTORY     - 1989     MONUMENTED       NOS
 DL6627  HISTORY     - 200812   GOOD             NGS
 DL6627  HISTORY     - 20120405 GOOD             NGS
 DL6627
 DL6627                          STATION DESCRIPTION
 DL6627
 DL6627'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6627'THE BENCH MARK IS A DISK SET IN THE CONCRETE DECK ALONG THE NORTHWEST
 DL6627'SIDE OF THE DC POLICE AND FIRE HARBOR PATROL PIER 5.
 DL6627'
 DL6627'26.7 FT (8.1 M) SOUTHEAST OF THE NORTHWEST EDGE OF THE PIER, 12.2 FT
 DL6627'(3.7 M) NORTHWEST OF THE DOOR TO TIDE STATION ROOM AND 0.8 FT (0.2 M)
 DL6627'SOUTH OF THE SOUTHWEST CORNER OF THE PROTRUDING ENTRANCE TO THE BOAT
 DL6627'REPAIR BAY.
 DL6627
 DL6627                          STATION RECOVERY (2012)
 DL6627
 DL6627'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DL6627'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DO1150 ***********************************************************************
 DO1150  DESIGNATION -  859 4900 J
 DO1150  PID         -  DO1150
 DO1150  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DO1150  COUNTRY     -  US
 DO1150  USGS QUAD   -  ALEXANDRIA (2019)
 DO1150
 DO1150                         *CURRENT SURVEY CONTROL
 DO1150  ______________________________________________________________________
 DO1150* NAD 83(1986) POSITION- 38 52 24.0    (N) 077 01 16.2    (W)   HD_HELD2
 DO1150* NAVD 88 ORTHO HEIGHT -     2.226 (meters)        7.30  (feet) ADJUSTED
 DO1150  ______________________________________________________________________
 DO1150  GEOID HEIGHT    -        -32.140 (meters)                     GEOID18
 DO1150  DYNAMIC HEIGHT  -          2.225 (meters)        7.30  (feet) COMP
 DO1150  MODELED GRAVITY -    980,097.1   (mgal)                       NAVD 88
 DO1150
 DO1150  VERT ORDER      -  FIRST     CLASS II
 DO1150
 DO1150.The horizontal coordinates were established by autonomous hand held GPS
 DO1150.observations and have an estimated accuracy of +/- 10 meters.
 DO1150
 DO1150.The orthometric height was determined by differential leveling and
 DO1150.adjusted by the NATIONAL GEODETIC SURVEY
 DO1150.in October 2012.
 DO1150
 DO1150.No vertical observational check was made to the station.
 DO1150
 DO1150.Significant digits in the geoid height do not necessarily reflect accuracy.
 DO1150.GEOID18 height accuracy estimate available here.
 DO1150
 DO1150.Click photographs - Photos may exist for this station.
 DO1150
 DO1150.The dynamic height is computed by dividing the NAVD 88
 DO1150.geopotential number by the normal gravity value computed on the
 DO1150.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DO1150.degrees latitude (g = 980.6199 gals.).
 DO1150
 DO1150.The modeled gravity was interpolated from observed gravity values.
 DO1150
 DO1150
 DO1150_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2466404661(NAD 83)
 DO1150
 DO1150                          SUPERSEDED SURVEY CONTROL
 DO1150
 DO1150.No superseded survey control is available for this station.
 DO1150
 DO1150_MARKER: DD = SURVEY DISK
 DO1150_SETTING: 35 = SET IN A MAT FOUNDATION OR CONCRETE SLAB OTHER THAN
 DO1150+WITH SETTING: PAVEMENT
 DO1150_SP_SET: PIER DECK
 DO1150_STAMPING: 4900 J 2007
 DO1150_MARK LOGO: NOS
 DO1150_MAGNETIC: N = NO MAGNETIC MATERIAL
 DO1150_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DO1150+STABILITY: SURFACE MOTION
 DO1150_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 DO1150+SATELLITE: SATELLITE OBSERVATIONS - April 05, 2012
 DO1150
 DO1150  HISTORY     - Date     Condition        Report By
 DO1150  HISTORY     - 2007     MONUMENTED       NOS
 DO1150  HISTORY     - 20120405 GOOD             NGS
 DO1150
 DO1150                          STATION DESCRIPTION
 DO1150
 DO1150'DESCRIBED BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DO1150'THE STATION IS LOCATED IN WASHINGTON, DC.
 DO1150'
 DO1150'IT IS SET IN THE CONCRETE DECK ALONG THE SOUTHWEST SIDE OF THE DC
 DO1150'POLICE AND FIRE HARBOR PATROL PIER (PIER 5).
 DO1150'
 DO1150'IT IS 7.88 M (25.9 FT) EAST OF THE CENTER LINE OF A BOLLARD ON THE
 DO1150'SOUTHWEST END OF THE PIER, 2.10 M (6.9 FT) SOUTHWEST FROM THE CENTER
 DO1150'LINE OF A BOLLARD ON THE SOUTHEAST END OF THE PIER, 1.14 M (3.7 FT)
 DO1150'NORTHWEST OF THE SOUTHEAST RETAINING WALL AND SET FLUSH WITH THE PIER
 DO1150'DECK NEXT TO THE AQUATRAK WELL AND GAUGE HOUSE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1986 ***********************************************************************
 HV1986  DESIGNATION -  859 4900 TIDAL 2
 HV1986  PID         -  HV1986
 HV1986  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1986  COUNTRY     -  US
 HV1986  USGS QUAD   -  ALEXANDRIA (2019)
 HV1986
 HV1986                         *CURRENT SURVEY CONTROL
 HV1986  ______________________________________________________________________
 HV1986* NAD 83(1986) POSITION- 38 52 26.     (N) 077 01 14.     (W)   SCALED
 HV1986* NAVD 88 ORTHO HEIGHT -     2.294 (meters)        7.53  (feet) ADJUSTED
 HV1986  ______________________________________________________________________
 HV1986  GEOID HEIGHT    -        -32.140 (meters)                     GEOID18
 HV1986  DYNAMIC HEIGHT  -          2.293 (meters)        7.52  (feet) COMP
 HV1986  MODELED GRAVITY -    980,097.2   (mgal)                       NAVD 88
 HV1986
 HV1986  VERT ORDER      -  FIRST     CLASS I
 HV1986
 HV1986.The horizontal coordinates were scaled from a map and have
 HV1986.an estimated accuracy of +/- 6 seconds.
 HV1986
 HV1986.The orthometric height was determined by differential leveling and
 HV1986.adjusted by the NATIONAL GEODETIC SURVEY
 HV1986.in June 1991.
 HV1986
 HV1986.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1986.GEOID18 height accuracy estimate available here.
 HV1986
 HV1986.Click photographs - Photos may exist for this station.
 HV1986
 HV1986.The dynamic height is computed by dividing the NAVD 88
 HV1986.geopotential number by the normal gravity value computed on the
 HV1986.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1986.degrees latitude (g = 980.6199 gals.).
 HV1986
 HV1986.The modeled gravity was interpolated from observed gravity values.
 HV1986
 HV1986
 HV1986_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ247047(NAD 83)
 HV1986
 HV1986                          SUPERSEDED SURVEY CONTROL
 HV1986
 HV1986  NGVD 29 (11/26/84)    2.531  (m)            8.30   (f) ADJUSTED    1 1
 HV1986
 HV1986.Superseded values are not recommended for survey control.
 HV1986
 HV1986.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1986.See file dsdata.pdf to determine how the superseded data were derived.
 HV1986
 HV1986_MARKER: DB = BENCH MARK DISK
 HV1986_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
 HV1986_SP_SET: SEAWALL
 HV1986_STAMPING: TIDAL NO 2 1951
 HV1986_MARK LOGO: CGS
 HV1986_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1986+STABILITY: SURFACE MOTION
 HV1986
 HV1986  HISTORY     - Date     Condition        Report By
 HV1986  HISTORY     - 1951     MONUMENTED       CGS
 HV1986  HISTORY     - 1972     GOOD             NGS
 HV1986  HISTORY     - 19920512 MARK NOT FOUND   NGS
 HV1986
 HV1986                          STATION DESCRIPTION
 HV1986
 HV1986'DESCRIBED BY NATIONAL GEODETIC SURVEY 1972
 HV1986'AT WASHINGTON.
 HV1986'AT WASHINGTON DC, NEAR THE SOUTHEAST END OF WATER STREET, ALONG
 HV1986'THE SOUTHEAST SIDE OF PIER 5 FOR THE HARBOR POLICE, SET IN THE
 HV1986'TOP OF THE CONCRETE SEAWALL ALONG THE EAST SIDE OF THE
 HV1986'WASHINGTON CHANNEL, 50.9 FEET SOUTHEAST OF THE CENTER OF THE
 HV1986'SOUTHEAST GATE FOR PIER 5, 19.9 FEET NORTHWEST OF THE NORTH
 HV1986'CORNER OF THE MOST NORTHWESTERLY CONCRETE POST FOR THE PICKET
 HV1986'FENCE ON THE SEAWALL, 267.4 FEET SOUTHEAST OF BENCH MARK 1347
 HV1986'(USE)=TIDAL MARK DESCRIBED, ABOUT LEVEL WITH THE PARKING AREA.
 HV1986
 HV1986                          STATION RECOVERY (1992)
 HV1986
 HV1986'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1986'A THOROUGH SEARCH REVEALED NO EVIDENCE OF THE MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AH7372 ***********************************************************************
 AH7372  DESIGNATION -  868 H 90002
 AH7372  PID         -  AH7372
 AH7372  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AH7372  COUNTRY     -  US
 AH7372  USGS QUAD   -  WASHINGTON WEST (2016)
 AH7372
 AH7372                         *CURRENT SURVEY CONTROL
 AH7372  ______________________________________________________________________
 AH7372* NAD 83(2011) POSITION- 38 53 34.08259(N) 077 02 11.58325(W)   ADJUSTED
 AH7372* NAD 83(2011) ELLIP HT-   -28.927 (meters)        (06/27/12)   ADJUSTED
 AH7372* NAD 83(2011) EPOCH   -  2010.00
 AH7372* NAVD 88 ORTHO HEIGHT -     3.144 (meters)       10.31  (feet) ADJUSTED
 AH7372  ______________________________________________________________________
 AH7372  GEOID HEIGHT    -        -32.080 (meters)                     GEOID18
 AH7372  NAD 83(2011) X  -  1,115,093.455 (meters)                     COMP
 AH7372  NAD 83(2011) Y  - -4,844,096.933 (meters)                     COMP
 AH7372  NAD 83(2011) Z  -  3,983,043.302 (meters)                     COMP
 AH7372  LAPLACE CORR    -         -2.41  (seconds)                    DEFLEC18
 AH7372  DYNAMIC HEIGHT  -          3.143 (meters)       10.31  (feet) COMP
 AH7372  MODELED GRAVITY -    980,097.6   (mgal)                       NAVD 88
 AH7372
 AH7372  VERT ORDER      -  FIRST     CLASS II
 AH7372
 AH7372  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AH7372  Standards:
 AH7372         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AH7372            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AH7372  -------------------------------------------------------------------
 AH7372  NETWORK    1.34   1.00           0.62   0.44   0.51     -0.08557962
 AH7372  -------------------------------------------------------------------
 AH7372  Click here for local accuracies and other accuracy information.
 AH7372
 AH7372.The horizontal coordinates were established by GPS observations
 AH7372.and adjusted by the National Geodetic Survey in June 2012.
 AH7372
 AH7372.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AH7372.been affixed to the stable North American tectonic plate. See 
 AH7372.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AH7372
 AH7372.The horizontal coordinates are valid at the epoch date displayed above
 AH7372.which is a decimal equivalence of Year/Month/Day.
 AH7372
 AH7372.The orthometric height was determined by differential leveling and
 AH7372.adjusted by the NATIONAL GEODETIC SURVEY
 AH7372.in May 1999.
 AH7372
 AH7372.Significant digits in the geoid height do not necessarily reflect accuracy.
 AH7372.GEOID18 height accuracy estimate available here.
 AH7372
 AH7372.Click photographs - Photos may exist for this station.
 AH7372
 AH7372.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AH7372
 AH7372.The Laplace correction was computed from DEFLEC18 derived deflections.
 AH7372
 AH7372.The ellipsoidal height was determined by GPS observations
 AH7372.and is referenced to NAD 83.
 AH7372
 AH7372.The dynamic height is computed by dividing the NAVD 88
 AH7372.geopotential number by the normal gravity value computed on the
 AH7372.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AH7372.degrees latitude (g = 980.6199 gals.).
 AH7372
 AH7372.The modeled gravity was interpolated from observed gravity values.
 AH7372
 AH7372. The following values were computed from the NAD 83(2011) position.
 AH7372
 AH7372;                    North         East     Units Scale Factor Converg.
 AH7372;UTM  18      - 4,306,851.990   323,377.741   MT  0.99998415   -1 16 44.4
 AH7372
 AH7372!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AH7372!UTM  18      -   1.00000454  x   0.99998415  =   0.99998869
 AH7372
 AH7372_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2337706851(NAD 83)
 AH7372
 AH7372|---------------------------------------------------------------------|
 AH7372| PID    Reference Object                     Distance      Geod. Az  |
 AH7372|                                                           dddmmss.s |
 AH7372| HV4442 WASHINGTON MONUMENT                 387.127 METERS 16255     |
 AH7372|---------------------------------------------------------------------|
 AH7372
 AH7372                          SUPERSEDED SURVEY CONTROL
 AH7372
 AH7372  NAD 83(2007)-  38 53 34.08270(N)    077 02 11.58395(W) AD(2002.00) 0
 AH7372  ELLIP H (02/10/07)  -28.906  (m)                       GP(2002.00)    
 AH7372  NAD 83(1993)-  38 53 34.08274(N)    077 02 11.58362(W) AD(       ) A
 AH7372  ELLIP H (09/11/02)  -28.896  (m)                       GP(       ) 4 2
 AH7372  NAVD 88               3.14   (m)           10.3    (f) LEVELING    3  
 AH7372
 AH7372.Superseded values are not recommended for survey control.
 AH7372
 AH7372.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AH7372.See file dsdata.pdf to determine how the superseded data were derived.
 AH7372
 AH7372_MARKER: DD = SURVEY DISK
 AH7372_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 AH7372_STAMPING: 6H 90002
 AH7372_MARK LOGO: NPS
 AH7372_PROJECTION: FLUSH
 AH7372_MAGNETIC: N = NO MAGNETIC MATERIAL
 AH7372_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AH7372+STABILITY: SURFACE MOTION
 AH7372
 AH7372  HISTORY     - Date     Condition        Report By
 AH7372  HISTORY     - UNK      MONUMENTED       NPS
 AH7372  HISTORY     - 19980928 GOOD             NGS
 AH7372  HISTORY     - 19991122 GOOD             NGS
 AH7372  HISTORY     - 20090317 MARK NOT FOUND   GEOCAC
 AH7372  HISTORY     - 20120301 GOOD             NGS
 AH7372
 AH7372                          STATION DESCRIPTION
 AH7372
 AH7372'DESCRIBED BY NATIONAL GEODETIC SURVEY 1998 (RLA)
 AH7372'IN WASHINGTON, DC AT THE SOUTH END OF THE ELLIPSE, NEAR ELLIPSE DRIVE,
 AH7372'A CONCRETE POST FLUSH WITH THE GROUND, 1.5 M (4.8 FT) NORTH-NORTHWEST
 AH7372'OF THE NORTH EDGE OF SIDEWALK, 11.9 M (39.0 FT) NORTH-NORTHWEST OF
 AH7372'SOUTH EDGE OF THE NORTH CURB, 20.0 M (65.6 FT) NORTHWEST OF A LAMP
 AH7372'POLE (UNMARKED), 20.4 M (67.0 FT) NORTHEAST OF A LAMP POLE ALSO
 AH7372'UNMARKED, 19.0 M (62.2 FT) NORTH-NORTHWEST OF CENTERLINE OF ELLIPSE
 AH7372'DRIVE, AND 43.7 M (143.3 FT) SOUTH OF A 2.5 FT DIAMETER STEEL MANHOLE
 AH7372'COVER FOR THE BELL TELEPHONE SYSTEM.  NOTE--DISK HAS BEEN HIT BY
 AH7372'MACHINERY AND ONLY PART OF STAMPING IS LEGIBLE.
 AH7372
 AH7372                          STATION RECOVERY (1999)
 AH7372
 AH7372'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1999 (RWA)
 AH7372'RECOVERED AS DESCRIBED.
 AH7372
 AH7372                          STATION RECOVERY (2009)
 AH7372
 AH7372'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 AH7372'WE LOOKED ALL OVER, AND EVEN WITH THE BENEFIT OF ADJUSTED GPS
 AH7372'COORDINATES AND A GREAT DESCRIPTION, COULD NOT FIND THE MARK.  WE
 AH7372'THINK IT IS PROBABLY BURIED UNDER THE DIRT AND GRASS IN THE PARK.
 AH7372
 AH7372                          STATION RECOVERY (2012)
 AH7372
 AH7372'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 AH7372'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1913 ***********************************************************************
 HV1913  DESIGNATION -  9
 HV1913  PID         -  HV1913
 HV1913  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1913  COUNTRY     -  US
 HV1913  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1913
 HV1913                         *CURRENT SURVEY CONTROL
 HV1913  ______________________________________________________________________
 HV1913* NAD 83(1986) POSITION- 38 56 38.     (N) 077 04 05.     (W)   SCALED
 HV1913* NAVD 88 ORTHO HEIGHT -    99.834 (meters)      327.54  (feet) ADJUSTED
 HV1913  ______________________________________________________________________
 HV1913  GEOID HEIGHT    -        -31.958 (meters)                     GEOID18
 HV1913  DYNAMIC HEIGHT  -         99.780 (meters)      327.36  (feet) COMP
 HV1913  MODELED GRAVITY -    980,082.9   (mgal)                       NAVD 88
 HV1913
 HV1913  VERT ORDER      -  SECOND    CLASS 0
 HV1913
 HV1913.The horizontal coordinates were scaled from a map and have
 HV1913.an estimated accuracy of +/- 6 seconds.
 HV1913
 HV1913.The orthometric height was determined by differential leveling and
 HV1913.adjusted by the NATIONAL GEODETIC SURVEY
 HV1913.in June 1991.
 HV1913
 HV1913.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1913.GEOID18 height accuracy estimate available here.
 HV1913
 HV1913.Click photographs - Photos may exist for this station.
 HV1913
 HV1913.The dynamic height is computed by dividing the NAVD 88
 HV1913.geopotential number by the normal gravity value computed on the
 HV1913.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1913.degrees latitude (g = 980.6199 gals.).
 HV1913
 HV1913.The modeled gravity was interpolated from observed gravity values.
 HV1913
 HV1913
 HV1913_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ207125(NAD 83)
 HV1913
 HV1913                          SUPERSEDED SURVEY CONTROL
 HV1913
 HV1913  NGVD 29 (11/26/84)  100.066  (m)          328.30   (f) ADJUSTED    2 0
 HV1913
 HV1913.Superseded values are not recommended for survey control.
 HV1913
 HV1913.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1913.See file dsdata.pdf to determine how the superseded data were derived.
 HV1913
 HV1913_MARKER: X = CHISELED CROSS
 HV1913_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1913_SP_SET: STEPS
 HV1913_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1913
 HV1913  HISTORY     - Date     Condition        Report By
 HV1913  HISTORY     - UNK      MONUMENTED       CGS
 HV1913  HISTORY     - 1970     GOOD             NGS
 HV1913
 HV1913                          STATION DESCRIPTION
 HV1913
 HV1913'DESCRIBED BY NATIONAL GEODETIC SURVEY 1970
 HV1913'IN WASHINGTON.
 HV1913'AT WASHINGTON D.C. IN THE NW. SECTION ON THE GROUNDS OF THE OLD
 HV1913'BUREAU OF STANDARDS, NOW OCCUPIED BY THE WASHINGTON INSTITUTE
 HV1913'OF TECH. SET IN THE TOP OF THE E. END OF THE TOP OF THE CONC.
 HV1913'STEPS TO THE S. ENTRANCE OF BLDG. 5 6 IN S OF THE S. WALL OF THE
 HV1913'BUILDING 15 1/2 FT E. OF CENTERLINE OF THE DOORWAY ENTRANCE.
 HV1913'A 1 1/2 X 1 1/2 IN CHISELED CROSS IN CONC. STEP.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1472 ***********************************************************************
 HV1472  DESIGNATION -  9 23
 HV1472  PID         -  HV1472
 HV1472  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1472  COUNTRY     -  US
 HV1472  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1472
 HV1472                         *CURRENT SURVEY CONTROL
 HV1472  ______________________________________________________________________
 HV1472* NAD 83(1993) POSITION- 38 52 33.17277(N) 076 58 34.55287(W)   ADJUSTED
 HV1472* NAVD 88 ORTHO HEIGHT -    11.240 (meters)       36.88  (feet) ADJUSTED
 HV1472  ______________________________________________________________________
 HV1472  GEOID HEIGHT    -        -32.211 (meters)                     GEOID18
 HV1472  LAPLACE CORR    -         -3.28  (seconds)                    DEFLEC18
 HV1472  DYNAMIC HEIGHT  -         11.234 (meters)       36.86  (feet) COMP
 HV1472  MODELED GRAVITY -    980,093.2   (mgal)                       NAVD 88
 HV1472
 HV1472  HORZ ORDER      -  SECOND
 HV1472  VERT ORDER      -  SECOND    CLASS 0
 HV1472
 HV1472.The horizontal coordinates were established by classical geodetic methods
 HV1472.and adjusted by the National Geodetic Survey in November 1994.
 HV1472
 HV1472.The orthometric height was determined by differential leveling and
 HV1472.adjusted by the NATIONAL GEODETIC SURVEY
 HV1472.in June 1991.
 HV1472
 HV1472.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1472.GEOID18 height accuracy estimate available here.
 HV1472
 HV1472.Click photographs - Photos may exist for this station.
 HV1472
 HV1472.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1472
 HV1472.The dynamic height is computed by dividing the NAVD 88
 HV1472.geopotential number by the normal gravity value computed on the
 HV1472.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1472.degrees latitude (g = 980.6199 gals.).
 HV1472
 HV1472.The modeled gravity was interpolated from observed gravity values.
 HV1472
 HV1472. The following values were computed from the NAD 83(1993) position.
 HV1472
 HV1472;                    North         East     Units Scale Factor Converg.
 HV1472;SPC MD       -   134,228.209   402,059.589   MT  0.99994985   +0 00 53.6
 HV1472;SPC MD       -   440,380.38  1,319,090.50   sFT  0.99994985   +0 00 53.6
 HV1472;SPC VA N     - 2,135,320.038 3,632,214.456   MT  0.99995853   +0 57 03.6
 HV1472;SPC VA N     - 7,005,629.16 11,916,690.26   sFT  0.99995853   +0 57 03.6
 HV1472;UTM  18      - 4,304,859.212   328,565.909   MT  0.99996191   -1 14 26.4
 HV1472
 HV1472!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1472!SPC MD       -   1.00000329  x   0.99994985  =   0.99995314
 HV1472!SPC VA N     -   1.00000329  x   0.99995853  =   0.99996182
 HV1472!UTM  18      -   1.00000329  x   0.99996191  =   0.99996520
 HV1472
 HV1472:                Primary Azimuth Mark                     Grid Az
 HV1472:SPC MD       -  9 31 USE 1960                            302 38 44.6
 HV1472:SPC VA N     -  9 31 USE 1960                            301 42 34.6
 HV1472:UTM  18      -  9 31 USE 1960                            303 54 04.6
 HV1472
 HV1472_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2856504859(NAD 83)
 HV1472
 HV1472|---------------------------------------------------------------------|
 HV1472| PID    Reference Object                     Distance      Geod. Az  |
 HV1472|                                                           dddmmss.s |
 HV1472| HV7722 9 31 USE 1960                       409.202 METERS 3023938.2 |
 HV1472| HV1473 9 23 RESET                            3.990 METERS 30540     |
 HV1472|---------------------------------------------------------------------|
 HV1472
 HV1472                          SUPERSEDED SURVEY CONTROL
 HV1472
 HV1472  NAD 83(1991)-  38 52 33.17145(N)    076 58 34.55402(W) AD(       ) 2
 HV1472  NAD 83(1986)-  38 52 33.17067(N)    076 58 34.56480(W) AD(       ) 2
 HV1472  NAD 27      -  38 52 32.76820(N)    076 58 35.65120(W) AD(       ) 2
 HV1472  NGVD 29 (11/26/84)   11.480  (m)           37.66   (f) ADJUSTED    2 0
 HV1472
 HV1472.Superseded values are not recommended for survey control.
 HV1472
 HV1472.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1472.See file dsdata.pdf to determine how the superseded data were derived.
 HV1472
 HV1472_MARKER: DD = SURVEY DISK
 HV1472_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1472_SP_SET: BRIDGE SIDEWALK
 HV1472_STAMPING: 9-23
 HV1472_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1472
 HV1472  HISTORY     - Date     Condition        Report By
 HV1472  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1472  HISTORY     - 1961     GOOD             CGS
 HV1472  HISTORY     - 1962     SEE DESCRIPTION  CGS
 HV1472
 HV1472                          STATION DESCRIPTION
 HV1472
 HV1472'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1472'STATION IS LOCATED AT THE SE END OF THE JOHN PHILIP SOUSA MEMORIAL
 HV1472'BRIDGE, 131 FEET NW OF THE SE END OF THE SW RAILING, 3.4 FEET SW
 HV1472'OF THE SW BRIDGE CURB LINE AND IN THE SIDEWALK.  MARK IS A USE
 HV1472'DISK STAMPED 9-23.
 HV1472
 HV1472                          STATION RECOVERY (1961)
 HV1472
 HV1472'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1961
 HV1472'IN WASHINGTON.
 HV1472'IN SE WASHINGTON, AT THE SE END OF THE JOHN PHILIP SAUSA MEMORIAL
 HV1472'BRIDGE, 131 FT. NW OF THE SE END OF THE SW RAILING, 3.4 FT. SE
 HV1472'OF THE SW BRIDGE CURB LINE AND IN THE SIDEWALK.
 HV1472
 HV1472                          STATION RECOVERY (1962)
 HV1472
 HV1472'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1962 (JLA)
 HV1472'STATION RECOVERED AS DESCRIBED IN GOOD CONDITION.
 HV1472'
 HV1472'STATION WAS DESTROYED AFTER NEW STATION 9-23 USE RESET 1962 WAS
 HV1472'ESTABLISHED TO MAKE WAY FOR HIGHWAY CONSTRUCTION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1473 ***********************************************************************
 HV1473  DESIGNATION -  9 23 RESET
 HV1473  PID         -  HV1473
 HV1473  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1473  COUNTRY     -  US
 HV1473  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1473
 HV1473                         *CURRENT SURVEY CONTROL
 HV1473  ______________________________________________________________________
 HV1473* NAD 83(1993) POSITION- 38 52 33.24823(N) 076 58 34.68734(W)   NO CHECK
 HV1473* NAVD 88 ORTHO HEIGHT -    11.287 (meters)       37.03  (feet) ADJUSTED
 HV1473  ______________________________________________________________________
 HV1473  GEOID HEIGHT    -        -32.211 (meters)                     GEOID18
 HV1473  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV1473  DYNAMIC HEIGHT  -         11.281 (meters)       37.01  (feet) COMP
 HV1473  MODELED GRAVITY -    980,093.3   (mgal)                       NAVD 88
 HV1473
 HV1473  HORZ ORDER      -  THIRD
 HV1473  VERT ORDER      -  FIRST     CLASS I
 HV1473
 HV1473.The horizontal coordinates were established by classical geodetic methods
 HV1473.and adjusted by the National Geodetic Survey in November 1994.
 HV1473
 HV1473.No horizontal observational check was made to the station.
 HV1473
 HV1473.The orthometric height was determined by differential leveling and
 HV1473.adjusted by the NATIONAL GEODETIC SURVEY
 HV1473.in June 1991.
 HV1473
 HV1473.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1473.GEOID18 height accuracy estimate available here.
 HV1473
 HV1473.Click photographs - Photos may exist for this station.
 HV1473
 HV1473.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1473
 HV1473.The dynamic height is computed by dividing the NAVD 88
 HV1473.geopotential number by the normal gravity value computed on the
 HV1473.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1473.degrees latitude (g = 980.6199 gals.).
 HV1473
 HV1473.The modeled gravity was interpolated from observed gravity values.
 HV1473
 HV1473. The following values were computed from the NAD 83(1993) position.
 HV1473
 HV1473;                    North         East     Units Scale Factor Converg.
 HV1473;SPC MD       -   134,230.535   402,056.347   MT  0.99994985   +0 00 53.5
 HV1473;SPC MD       -   440,388.01  1,319,079.87   sFT  0.99994985   +0 00 53.5
 HV1473;SPC VA N     - 2,135,322.310 3,632,211.176   MT  0.99995853   +0 57 03.5
 HV1473;SPC VA N     - 7,005,636.61 11,916,679.50   sFT  0.99995853   +0 57 03.5
 HV1473;UTM  18      - 4,304,861.608   328,562.719   MT  0.99996192   -1 14 26.5
 HV1473
 HV1473!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1473!SPC MD       -   1.00000328  x   0.99994985  =   0.99995313
 HV1473!SPC VA N     -   1.00000328  x   0.99995853  =   0.99996181
 HV1473!UTM  18      -   1.00000328  x   0.99996192  =   0.99996520
 HV1473
 HV1473_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2856204861(NAD 83)
 HV1473
 HV1473                          SUPERSEDED SURVEY CONTROL
 HV1473
 HV1473  NAD 83(1991)-  38 52 33.24691(N)    076 58 34.68848(W) AD(       ) 3
 HV1473  NAD 83(1986)-  38 52 33.24613(N)    076 58 34.69927(W) AD(       ) 3
 HV1473  NAD 27      -  38 52 32.84370(N)    076 58 35.78570(W) AD(       ) 3
 HV1473  NGVD 29 (11/26/84)   11.525  (m)           37.81   (f) ADJUSTED    1 1
 HV1473
 HV1473.Superseded values are not recommended for survey control.
 HV1473
 HV1473.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1473.See file dsdata.pdf to determine how the superseded data were derived.
 HV1473
 HV1473_MARKER: DD = SURVEY DISK
 HV1473_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1473_SP_SET: BRIDGE SIDEWALK
 HV1473_STAMPING: 9 23 RESET 1963 USED
 HV1473_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1473
 HV1473  HISTORY     - Date     Condition        Report By
 HV1473  HISTORY     - 1963     MONUMENTED       CGS
 HV1473  HISTORY     - 1971     GOOD             NGS
 HV1473  HISTORY     - 1971     GOOD             NGS
 HV1473  HISTORY     - 20050409 MARK NOT FOUND   GEOCAC
 HV1473
 HV1473                          STATION DESCRIPTION
 HV1473
 HV1473'DESCRIBED BY COAST AND GEODETIC SURVEY 1963 (JLA)
 HV1473'STATION IS LOCATED NEAR THE EAST END AND ON THE SOUTH SIDE OF
 HV1473'JOHN PHILIP SOUSA BRIDGE, PENNSYLVANIA AVENUE, SOUTHEAST.
 HV1473'
 HV1473'MARK IS A STANDARD TRIANGULATION DISK SET FLUSH IN CONCRETE IN
 HV1473'A DRILL HOLE IN THE SIDEWALK, ABOUT MIDWAY BETWEEN THE CURB EDGE
 HV1473'AND A MARBLE BASED LAMP POST, AND ABOUT 1 FOOT EAST OF THE SOUTH
 HV1473'EASTERNMOST EXPANSION JOINT OF THE BRIDGE.  DISK IS STAMPED 9-23
 HV1473'USED RESET 1963.
 HV1473
 HV1473                          STATION RECOVERY (1971)
 HV1473
 HV1473'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1473'STATION WAS RECOVERED AS DESCRIBED AND WAS FOUND TO BE IN GOOD
 HV1473'CONDITION.  THE DESCRIPTION IS ADEQUATE.
 HV1473
 HV1473                          STATION RECOVERY (1971)
 HV1473
 HV1473'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971
 HV1473'IN WASHINGTON.
 HV1473'AT WASHINGTON, D.C., ABOUT 1.8 MILES SOUTHEAST ALONG PENNSYLVANIA
 HV1473'AVENUE FROM THE JUNCTION OF INDEPENDENCE AVENUE, SET IN THE TOP
 HV1473'OF THE CONCRETE SIDEWALK ON THE SOUTHWEST SIDE OF THE JOHN
 HV1473'PHILIP SOUSA BRIDGE OVER THE ANACOSTIA RIVER, (THE MARK IS OVER
 HV1473'THE SOUTHWEST END OF THE SOUTHEAST GRANITE ABUTMENT OF THE
 HV1473'BRIDGE), 3.6 FEET NORTH OF THE EAST CORNER OF THE GRANITE FOUNDATION
 HV1473'FOR A LIGHT POLE, 7.1 FEET EAST OF THE SOUTHEAST END OF THE
 HV1473'SOUTHWEST METAL GUARDRAIL ON THE BRIDGE, 2.5 FEET SOUTHWEST OF THE
 HV1473'SOUTHWEST CURB OF PENNSYLVANIA AVENUE, AND ABOUT 1/2 FOOT ABOVE
 HV1473'THE LEVEL OF THE AVENUE.
 HV1473
 HV1473                          STATION RECOVERY (2005)
 HV1473
 HV1473'RECOVERY NOTE BY GEOCACHING 2005 (TAK)
 HV1473'THE AREA WHERE THE DISK WAS HAS BEEN RE-WORKED AND THE DISK WAS NOT
 HV1473'FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7722 ***********************************************************************
 HV7722  DESIGNATION -  9 31 USE 1960
 HV7722  PID         -  HV7722
 HV7722  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7722  COUNTRY     -  US
 HV7722  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7722
 HV7722                         *CURRENT SURVEY CONTROL
 HV7722  ______________________________________________________________________
 HV7722* NAD 83(1993) POSITION- 38 52 40.33376(N) 076 58 48.84499(W)   ADJUSTED
 HV7722* NAVD 88 ORTHO HEIGHT -     3.    (meters)       10.    (feet) SCALED
 HV7722  ______________________________________________________________________
 HV7722  GEOID HEIGHT    -        -32.201 (meters)                     GEOID18
 HV7722  LAPLACE CORR    -         -3.40  (seconds)                    DEFLEC18
 HV7722  HORZ ORDER      -  SECOND
 HV7722
 HV7722.The horizontal coordinates were established by classical geodetic methods
 HV7722.and adjusted by the National Geodetic Survey in November 1994.
 HV7722
 HV7722.The orthometric height was scaled from a topographic map.
 HV7722
 HV7722.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7722.GEOID18 height accuracy estimate available here.
 HV7722
 HV7722.Click photographs - Photos may exist for this station.
 HV7722
 HV7722.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7722
 HV7722. The following values were computed from the NAD 83(1993) position.
 HV7722
 HV7722;                    North         East     Units Scale Factor Converg.
 HV7722;SPC MD       -   134,448.939   401,715.049   MT  0.99994985   +0 00 44.7
 HV7722;SPC MD       -   441,104.56  1,317,960.12   sFT  0.99994985   +0 00 44.7
 HV7722;SPC VA N     - 2,135,535.111 3,631,866.352   MT  0.99995868   +0 56 54.6
 HV7722;SPC VA N     - 7,006,334.78 11,915,548.19   sFT  0.99995868   +0 56 54.6
 HV7722;UTM  18      - 4,305,087.442   328,226.284   MT  0.99996334   -1 14 35.6
 HV7722
 HV7722!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7722!SPC MD       -   1.00000462  x   0.99994985  =   0.99995447
 HV7722!SPC VA N     -   1.00000462  x   0.99995868  =   0.99996330
 HV7722!UTM  18      -   1.00000462  x   0.99996334  =   0.99996796
 HV7722
 HV7722:                Primary Azimuth Mark                     Grid Az
 HV7722:SPC MD       -  9 23                                     122 38 44.5
 HV7722:SPC VA N     -  9 23                                     121 42 34.6
 HV7722:UTM  18      -  9 23                                     123 54 04.8
 HV7722
 HV7722_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2822605087(NAD 83)
 HV7722
 HV7722|---------------------------------------------------------------------|
 HV7722| PID    Reference Object                     Distance      Geod. Az  |
 HV7722|                                                           dddmmss.s |
 HV7722| HV1472 9 23                                409.202 METERS 1223929.2 |
 HV7722| HV7686 S E 153 C 1960                      165.994 METERS 28813     |
 HV7722|---------------------------------------------------------------------|
 HV7722
 HV7722                          SUPERSEDED SURVEY CONTROL
 HV7722
 HV7722  NAD 83(1991)-  38 52 40.33243(N)    076 58 48.84613(W) AD(       ) 2
 HV7722  NAD 83(1986)-  38 52 40.33169(N)    076 58 48.85691(W) AD(       ) 2
 HV7722  NAD 27      -  38 52 39.92950(N)    076 58 49.94310(W) AD(       ) 2
 HV7722
 HV7722.Superseded values are not recommended for survey control.
 HV7722
 HV7722.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7722.See file dsdata.pdf to determine how the superseded data were derived.
 HV7722
 HV7722_MARKER: DS = TRIANGULATION STATION DISK
 HV7722_SETTING: 0 = UNSPECIFIED SETTING
 HV7722_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7722
 HV7722  HISTORY     - Date     Condition        Report By
 HV7722  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7722  HISTORY     - 1963     GOOD             CGS
 HV7722  HISTORY     - 1971     GOOD             NGS
 HV7722
 HV7722                          STATION DESCRIPTION
 HV7722
 HV7722'DESCRIBED BY COAST AND GEODETIC SURVEY 1963 (JLA)
 HV7722'MARK IS A STANDARD USE DISK STAMPED 9-31 SET IN THE CONCRETE
 HV7722'SIDEWALK, ON THE SOUTH SIDE AND NEAR THE NORTH WEST END OF THE
 HV7722'JOHN PHILIP SOUSA BRIDGE, ON PENNSYLVANIA AVENUE S.E.  IT IS
 HV7722'DIRECTLY OVER THE APPROXIMATE CENTER OF THE RAILROAD TRACKS
 HV7722'PARALLELING THE WEST SIDE OF THE RIVER.
 HV7722
 HV7722                          STATION RECOVERY (1971)
 HV7722
 HV7722'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7722'THE STATION WAS RECOVERED IN GOOD CONDITION AND THE DESCRIPTION
 HV7722'IS ADEQUATE WITH THE FOLLOWING EXCEPTION, THE DISK IS ABOUT 42
 HV7722'FEET WEST OF A POINT DIRECTLY OVER THE APPROXIMATE CENTER OF THE
 HV7722'RAILROAD TRACKS PARALLELING THE WEST SIDE OF THE RIVER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4512 ***********************************************************************
 HV4512  DESIGNATION -  9 CON
 HV4512  PID         -  HV4512
 HV4512  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4512  COUNTRY     -  US
 HV4512  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4512
 HV4512                         *CURRENT SURVEY CONTROL
 HV4512  ______________________________________________________________________
 HV4512* NAD 83(1993) POSITION- 38 53 32.12142(N) 077 01 26.95048(W)   ADJUSTED
 HV4512* NAVD 88 ORTHO HEIGHT -     1.98  (+/-2cm)        6.5   (feet) VERTCON3
 HV4512  ______________________________________________________________________
 HV4512  GEOID HEIGHT    -        -32.098 (meters)                     GEOID18
 HV4512  LAPLACE CORR    -         -2.84  (seconds)                    DEFLEC18
 HV4512  HORZ ORDER      -  SECOND
 HV4512  VERT ORDER      -  THIRD ? (See Below)
 HV4512
 HV4512.The horizontal coordinates were established by classical geodetic methods
 HV4512.and adjusted by the National Geodetic Survey in November 1994.
 HV4512
 HV4512.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4512.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4512
 HV4512.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4512.GEOID18 height accuracy estimate available here.
 HV4512
 HV4512.The vertical order pertains to the NGVD 29 superseded value.
 HV4512
 HV4512.Click photographs - Photos may exist for this station.
 HV4512
 HV4512.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4512
 HV4512. The following values were computed from the NAD 83(1993) position.
 HV4512
 HV4512;                    North         East     Units Scale Factor Converg.
 HV4512;SPC MD       -   136,045.928   397,904.656   MT  0.99994989   -0 00 54.6
 HV4512;SPC MD       -   446,344.02  1,305,458.86   sFT  0.99994989   -0 00 54.6
 HV4512;SPC VA N     - 2,137,069.644 3,628,030.339   MT  0.99995985   +0 55 16.0
 HV4512;SPC VA N     - 7,011,369.32 11,902,962.87   sFT  0.99995985   +0 55 16.0
 HV4512;UTM  18      - 4,306,767.594   324,451.726   MT  0.99997949   -1 16 16.3
 HV4512
 HV4512!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4512!SPC MD       -   1.00000473  x   0.99994989  =   0.99995461
 HV4512!SPC VA N     -   1.00000473  x   0.99995985  =   0.99996457
 HV4512!UTM  18      -   1.00000473  x   0.99997949  =   0.99998422
 HV4512
 HV4512:                Primary Azimuth Mark                     Grid Az
 HV4512:SPC MD       -  9 CON AZ MK                              359 45 23.7
 HV4512:SPC VA N     -  9 CON AZ MK                              358 49 13.1
 HV4512:UTM  18      -  9 CON AZ MK                              001 00 45.4
 HV4512
 HV4512_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2445106767(NAD 83)
 HV4512
 HV4512|---------------------------------------------------------------------|
 HV4512| PID    Reference Object                     Distance      Geod. Az  |
 HV4512|                                                           dddmmss.s |
 HV4512| HV4511 9 PEN                               204.836 METERS 00025     |
 HV4512| HV4508 6 CON                               343.809 METERS 09045     |
 HV4512| DC6630 9 CON AZ MK                                        3594429.1 |
 HV4512|---------------------------------------------------------------------|
 HV4512
 HV4512                          SUPERSEDED SURVEY CONTROL
 HV4512
 HV4512  NAD 83(1991)-  38 53 32.12026(N)    077 01 26.95172(W) AD(       ) 2
 HV4512  NAD 83(1986)-  38 53 32.11978(N)    077 01 26.96240(W) AD(       ) 2
 HV4512  NAD 27      -  38 53 31.71987(N)    077 01 28.04338(W) AD(       ) 2
 HV4512  NGVD 29 (07/19/86)    2.22   (m)            7.3    (f) LEVELING    3  
 HV4512
 HV4512.Superseded values are not recommended for survey control.
 HV4512
 HV4512.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4512.See file dsdata.pdf to determine how the superseded data were derived.
 HV4512
 HV4512_MARKER: DD = SURVEY DISK
 HV4512_SETTING: 0 = UNSPECIFIED SETTING
 HV4512
 HV4512  HISTORY     - Date     Condition        Report By
 HV4512  HISTORY     - 1981     MONUMENTED       CANDA
 HV4512  HISTORY     - 20090319 MARK NOT FOUND   GEOCAC
 HV4512
 HV4512                          STATION DESCRIPTION
 HV4512
 HV4512'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4512'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4512'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4512'
 HV4512'STATION IS LOCATED IN THE CONCRETE SIDEWALK ON THE NORTHWEST CORNER
 HV4512'OF 9TH STREET N.W. AND CONSTITUTION AVE. N.W.
 HV4512'
 HV4512'STATION IS 20.91 FT N OF SIGNAL POSTBASE ON CON. AVE.
 HV4512'
 HV4512'STATION IS 21.30 FT NW OF X ON RIM PEPCO M.H. AT CORNER.
 HV4512'
 HV4512'STATION IS 19.05 FT SW OF X ON RIM OF CATCH BASIN TOP ON 9TH
 HV4512'STREET.
 HV4512
 HV4512                          STATION RECOVERY (2009)
 HV4512
 HV4512'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV4512'WE LOOKED ALL OVER THE AREA, BUT THE POURED SIDEWALKS HAVE BEEN
 HV4512'REPLACED WITH BRICK PAVERS.  WE COULD NOT FIND ANY SIGN OF THE MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4510 ***********************************************************************
 HV4510  DESIGNATION -  9 E
 HV4510  PID         -  HV4510
 HV4510  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4510  COUNTRY     -  US
 HV4510  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4510
 HV4510                         *CURRENT SURVEY CONTROL
 HV4510  ______________________________________________________________________
 HV4510* NAD 83(1993) POSITION- 38 53 45.70703(N) 077 01 26.77763(W)   ADJUSTED
 HV4510* NAVD 88 ORTHO HEIGHT -     8.40  (+/-2cm)       27.6   (feet) VERTCON3
 HV4510  ______________________________________________________________________
 HV4510  GEOID HEIGHT    -        -32.090 (meters)                     GEOID18
 HV4510  LAPLACE CORR    -         -2.83  (seconds)                    DEFLEC18
 HV4510  HORZ ORDER      -  SECOND
 HV4510  VERT ORDER      -  THIRD ? (See Below)
 HV4510
 HV4510.The horizontal coordinates were established by classical geodetic methods
 HV4510.and adjusted by the National Geodetic Survey in November 1994.
 HV4510
 HV4510.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4510.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4510
 HV4510.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4510.GEOID18 height accuracy estimate available here.
 HV4510
 HV4510.The vertical order pertains to the NGVD 29 superseded value.
 HV4510
 HV4510.Click photographs - Photos may exist for this station.
 HV4510
 HV4510.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4510
 HV4510. The following values were computed from the NAD 83(1993) position.
 HV4510
 HV4510;                    North         East     Units Scale Factor Converg.
 HV4510;SPC MD       -   136,464.846   397,908.932   MT  0.99994991   -0 00 54.5
 HV4510;SPC MD       -   447,718.42  1,305,472.89   sFT  0.99994991   -0 00 54.5
 HV4510;SPC VA N     - 2,137,488.581 3,628,027.769   MT  0.99996017   +0 55 16.1
 HV4510;SPC VA N     - 7,012,743.79 11,902,954.44   sFT  0.99996017   +0 55 16.1
 HV4510;UTM  18      - 4,307,186.331   324,465.184   MT  0.99997943   -1 16 16.6
 HV4510
 HV4510!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4510!SPC MD       -   1.00000372  x   0.99994991  =   0.99995363
 HV4510!SPC VA N     -   1.00000372  x   0.99996017  =   0.99996389
 HV4510!UTM  18      -   1.00000372  x   0.99997943  =   0.99998315
 HV4510
 HV4510:                Primary Azimuth Mark                     Grid Az
 HV4510:SPC MD       -  9 E AZ MK                                185 21 35.4
 HV4510:SPC VA N     -  9 E AZ MK                                184 25 24.8
 HV4510:UTM  18      -  9 E AZ MK                                186 36 57.5
 HV4510
 HV4510_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2446507186(NAD 83)
 HV4510
 HV4510|---------------------------------------------------------------------|
 HV4510| PID    Reference Object                     Distance      Geod. Az  |
 HV4510|                                                           dddmmss.s |
 HV4510| HV4509 7 E                                 180.829 METERS 08310     |
 HV4510| HV4511 9 PEN                               214.126 METERS 18043     |
 HV4510| DC6631 9 E AZ MK                                          1852040.9 |
 HV4510| HV4514 11 E                                270.176 METERS 27016     |
 HV4510|---------------------------------------------------------------------|
 HV4510
 HV4510                          SUPERSEDED SURVEY CONTROL
 HV4510
 HV4510  NAD 83(1991)-  38 53 45.70588(N)    077 01 26.77887(W) AD(       ) 2
 HV4510  NAD 83(1986)-  38 53 45.70538(N)    077 01 26.78950(W) AD(       ) 2
 HV4510  NAD 27      -  38 53 45.30563(N)    077 01 27.87018(W) AD(       ) 2
 HV4510  NGVD 29 (07/19/86)    8.64   (m)           28.3    (f) LEVELING    3  
 HV4510
 HV4510.Superseded values are not recommended for survey control.
 HV4510
 HV4510.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4510.See file dsdata.pdf to determine how the superseded data were derived.
 HV4510
 HV4510_MARKER: DD = SURVEY DISK
 HV4510_SETTING: 0 = UNSPECIFIED SETTING
 HV4510_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV4510+SATELLITE: SATELLITE OBSERVATIONS - November 12, 2006
 HV4510
 HV4510  HISTORY     - Date     Condition        Report By
 HV4510  HISTORY     - 1981     MONUMENTED       CANDA
 HV4510  HISTORY     - 20030529 GOOD             GEOCAC
 HV4510  HISTORY     - 20061112 GOOD             USPSQD
 HV4510
 HV4510                          STATION DESCRIPTION
 HV4510
 HV4510'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4510'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4510'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4510'
 HV4510'STATION IS LOCATED IN THE SIDEWALK ON THE SOUTHWEST CORNER OF 9TH
 HV4510'STREET N.W. AND E STREET N.W.
 HV4510'
 HV4510'STATION IS 10.76 FT NE OF X ON TOP OF CONCRETE WALL.
 HV4510'
 HV4510'STATION IS 11.37 FT NW OF SIGNAL POST BASE ON 9TH STREET.
 HV4510'
 HV4510'STATION IS 5.50 FT SE OF SIGNAL POST BASE ON E STREET.
 HV4510
 HV4510                          STATION RECOVERY (2003)
 HV4510
 HV4510'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV4510'STATION IS A PADC DISK LOCATED ABOUT THREE FEET SOUTH OF THE SOUTHWEST
 HV4510'CORNER OF A CONCRETE CURB CUT, NEAR THE NORTHEAST CORNER OF THE FBI
 HV4510'HEADQUARTERS BUILDING.
 HV4510
 HV4510                          STATION RECOVERY (2006)
 HV4510
 HV4510'RECOVERY NOTE BY US POWER SQUADRON 2006 (DEB)
 HV4510'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4511 ***********************************************************************
 HV4511  DESIGNATION -  9 PEN
 HV4511  PID         -  HV4511
 HV4511  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4511  COUNTRY     -  US
 HV4511  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4511
 HV4511                         *CURRENT SURVEY CONTROL
 HV4511  ______________________________________________________________________
 HV4511* NAD 83(1993) POSITION- 38 53 38.76378(N) 077 01 26.88929(W)   ADJUSTED
 HV4511* NAVD 88 ORTHO HEIGHT -     3.75  (+/-2cm)       12.3   (feet) VERTCON3
 HV4511  ______________________________________________________________________
 HV4511  GEOID HEIGHT    -        -32.094 (meters)                     GEOID18
 HV4511  LAPLACE CORR    -         -2.84  (seconds)                    DEFLEC18
 HV4511  HORZ ORDER      -  SECOND
 HV4511  VERT ORDER      -  THIRD ? (See Below)
 HV4511
 HV4511.The horizontal coordinates were established by classical geodetic methods
 HV4511.and adjusted by the National Geodetic Survey in November 1994.
 HV4511
 HV4511.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4511.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4511
 HV4511.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4511.GEOID18 height accuracy estimate available here.
 HV4511
 HV4511.The vertical order pertains to the NGVD 29 superseded value.
 HV4511
 HV4511.Click photographs - Photos may exist for this station.
 HV4511
 HV4511.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4511
 HV4511. The following values were computed from the NAD 83(1993) position.
 HV4511
 HV4511;                    North         East     Units Scale Factor Converg.
 HV4511;SPC MD       -   136,250.748   397,906.184   MT  0.99994990   -0 00 54.5
 HV4511;SPC MD       -   447,016.00  1,305,463.87   sFT  0.99994990   -0 00 54.5
 HV4511;SPC VA N     - 2,137,274.464 3,628,028.521   MT  0.99996001   +0 55 16.0
 HV4511;SPC VA N     - 7,012,041.30 11,902,956.91   sFT  0.99996001   +0 55 16.0
 HV4511;UTM  18      - 4,306,972.338   324,457.744   MT  0.99997946   -1 16 16.5
 HV4511
 HV4511!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4511!SPC MD       -   1.00000445  x   0.99994990  =   0.99995435
 HV4511!SPC VA N     -   1.00000445  x   0.99996001  =   0.99996446
 HV4511!UTM  18      -   1.00000445  x   0.99997946  =   0.99998391
 HV4511
 HV4511:                Primary Azimuth Mark                     Grid Az
 HV4511:SPC MD       -  9 PEN AZ MK                              357 18 26.1
 HV4511:SPC VA N     -  9 PEN AZ MK                              356 22 15.6
 HV4511:UTM  18      -  9 PEN AZ MK                              358 33 48.1
 HV4511
 HV4511_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2445706972(NAD 83)
 HV4511
 HV4511|---------------------------------------------------------------------|
 HV4511| PID    Reference Object                     Distance      Geod. Az  |
 HV4511|                                                           dddmmss.s |
 HV4511| HV4510 9 E                                 214.126 METERS 00043     |
 HV4511| HV4512 9 CON                               204.836 METERS 18025     |
 HV4511| HV4513 11 PEN                              248.163 METERS 27947     |
 HV4511| DC6632 9 PEN AZ MK                                        3571731.6 |
 HV4511|---------------------------------------------------------------------|
 HV4511
 HV4511                          SUPERSEDED SURVEY CONTROL
 HV4511
 HV4511  NAD 83(1991)-  38 53 38.76263(N)    077 01 26.89053(W) AD(       ) 2
 HV4511  NAD 83(1986)-  38 53 38.76214(N)    077 01 26.90119(W) AD(       ) 2
 HV4511  NAD 27      -  38 53 38.36231(N)    077 01 27.98200(W) AD(       ) 2
 HV4511  NGVD 29 (07/19/86)    3.99   (m)           13.1    (f) LEVELING    3  
 HV4511
 HV4511.Superseded values are not recommended for survey control.
 HV4511
 HV4511.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4511.See file dsdata.pdf to determine how the superseded data were derived.
 HV4511
 HV4511_MARKER: DD = SURVEY DISK
 HV4511_SETTING: 0 = UNSPECIFIED SETTING
 HV4511
 HV4511  HISTORY     - Date     Condition        Report By
 HV4511  HISTORY     - 1981     MONUMENTED       CANDA
 HV4511  HISTORY     - 20090319 MARK NOT FOUND   GEOCAC
 HV4511
 HV4511                          STATION DESCRIPTION
 HV4511
 HV4511'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4511'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4511'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4511'
 HV4511'STATION IS LOCATED IN THE SIDEWALK ON THE NORTHWEST CORNER OF 9TH
 HV4511'STREET N.W. AND PENNSYLVANIA AVE. N.W.
 HV4511'
 HV4511'STATION IS 9.29 FT N OF SIGNAL POST BASE ON PA. AVE.
 HV4511'
 HV4511'STATION IS 19.74 FT SW OF SIGNAL POST BASE ON 9TH ST.
 HV4511'
 HV4511'STATION IS 33.79 FT SE OF N.E. COR OF STONE WALL ON PA. AVE.
 HV4511
 HV4511                          STATION RECOVERY (2009)
 HV4511
 HV4511'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV4511'WE LOOKED ALL OVER THE AREA, BUT THE POURED SIDEWALKS HAVE BEEN
 HV4511'REPLACED WITH BRICK PAVERS.  WE COULD NOT FIND ANY SIGN OF THE MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1841 ***********************************************************************
 HV1841  DESIGNATION -  A
 HV1841  PID         -  HV1841
 HV1841  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1841  COUNTRY     -  US
 HV1841  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1841
 HV1841                         *CURRENT SURVEY CONTROL
 HV1841  ______________________________________________________________________
 HV1841* NAD 83(2011) POSITION- 38 53 20.61532(N) 077 02 06.86295(W)   ADJUSTED
 HV1841* NAD 83(2011) ELLIP HT-   -21.115 (meters)        (06/27/12)   ADJUSTED
 HV1841* NAD 83(2011) EPOCH   -  2010.00
 HV1841* NAVD 88 ORTHO HEIGHT -    10.984 (meters)       36.04  (feet) ADJUSTED
 HV1841  ______________________________________________________________________
 HV1841  GEOID HEIGHT    -        -32.089 (meters)                     GEOID18
 HV1841  NAD 83(2011) X  -  1,115,264.170 (meters)                     COMP
 HV1841  NAD 83(2011) Y  - -4,844,331.427 (meters)                     COMP
 HV1841  NAD 83(2011) Z  -  3,982,724.969 (meters)                     COMP
 HV1841  LAPLACE CORR    -         -2.53  (seconds)                    DEFLEC18
 HV1841  DYNAMIC HEIGHT  -         10.978 (meters)       36.02  (feet) COMP
 HV1841  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV1841
 HV1841  VERT ORDER      -  FIRST     CLASS II
 HV1841
 HV1841  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV1841  Standards:
 HV1841         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV1841            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV1841  -------------------------------------------------------------------
 HV1841  NETWORK    1.39   1.04           0.64   0.47   0.53     -0.01497051
 HV1841  -------------------------------------------------------------------
 HV1841  Click here for local accuracies and other accuracy information.
 HV1841
 HV1841.The horizontal coordinates were established by GPS observations
 HV1841.and adjusted by the National Geodetic Survey in June 2012.
 HV1841
 HV1841.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV1841.been affixed to the stable North American tectonic plate. See 
 HV1841.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV1841
 HV1841.The horizontal coordinates are valid at the epoch date displayed above
 HV1841.which is a decimal equivalence of Year/Month/Day.
 HV1841
 HV1841.The orthometric height was determined by differential leveling and
 HV1841.adjusted by the NATIONAL GEODETIC SURVEY
 HV1841.in February 2015.
 HV1841
 HV1841.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1841.GEOID18 height accuracy estimate available here.
 HV1841
 HV1841.Click photographs - Photos may exist for this station.
 HV1841
 HV1841.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV1841
 HV1841.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1841
 HV1841.The ellipsoidal height was determined by GPS observations
 HV1841.and is referenced to NAD 83.
 HV1841
 HV1841.The dynamic height is computed by dividing the NAVD 88
 HV1841.geopotential number by the normal gravity value computed on the
 HV1841.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1841.degrees latitude (g = 980.6199 gals.).
 HV1841
 HV1841.The modeled gravity was interpolated from observed gravity values.
 HV1841
 HV1841. The following values were computed from the NAD 83(2011) position.
 HV1841
 HV1841;                    North         East     Units Scale Factor Converg.
 HV1841;UTM  18      - 4,306,434.271   323,482.203   MT  0.99998369   -1 16 41.1
 HV1841
 HV1841!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1841!UTM  18      -   1.00000331  x   0.99998369  =   0.99998700
 HV1841
 HV1841_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2348206434(NAD 83)
 HV1841
 HV1841|---------------------------------------------------------------------|
 HV1841| PID    Reference Object                     Distance      Geod. Az  |
 HV1841|                                                           dddmmss.s |
 HV1841| HV4442 WASHINGTON MONUMENT                  45.246 METERS 35958     |
 HV1841|---------------------------------------------------------------------|
 HV1841
 HV1841                          SUPERSEDED SURVEY CONTROL
 HV1841
 HV1841  NAD 83(2007)-  38 53 20.61548(N)    077 02 06.86366(W) AD(2002.00) 0
 HV1841  ELLIP H (02/10/07)  -21.092  (m)                       GP(2002.00)    
 HV1841  NAD 83(1993)-  38 53 20.61549(N)    077 02 06.86333(W) AD(       ) A
 HV1841  ELLIP H (09/11/02)  -21.083  (m)                       GP(       ) 4 2
 HV1841  NAVD 88 (04/20/10)   10.981  (m)           36.03   (f) SUPERSEDED  1 2
 HV1841  NAVD 88              10.98   (m)           36.0    (f) LEVELING    3  
 HV1841  NAVD 88 (04/19/00)   10.980  (m)           36.02   (f) SUPERSEDED  1 2
 HV1841  NAVD 88 (05/07/99)   10.983  (m)           36.03   (f) SUPERSEDED  1 2
 HV1841  NAVD 88 (02/03/93)   10.982  (m)           36.03   (f) SUPERSEDED  1 0
 HV1841  NAVD 88 (06/15/91)   10.981  (m)           36.03   (f) SUPERSEDED  1 0
 HV1841  NGVD 29 (08/12/92)   11.211  (m)           36.78   (f) ADJUSTED    1 0
 HV1841  NGVD 29 (??/??/87)   11.215  (m)           36.79   (f) SUPERSEDED  1 0
 HV1841
 HV1841.Superseded values are not recommended for survey control.
 HV1841
 HV1841.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1841.See file dsdata.pdf to determine how the superseded data were derived.
 HV1841
 HV1841_MARKER: Z = SEE DESCRIPTION
 HV1841_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1841_SP_SET: OBELISK
 HV1841_MARK LOGO: NONE
 HV1841_PROJECTION: FLUSH
 HV1841_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1841_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1841_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1841+SATELLITE: SATELLITE OBSERVATIONS - March 29, 2023
 HV1841
 HV1841  HISTORY     - Date     Condition        Report By
 HV1841  HISTORY     - 1877     MONUMENTED       PBPP
 HV1841  HISTORY     - 1971     GOOD             NGS
 HV1841  HISTORY     - 1974     GOOD             NGS
 HV1841  HISTORY     - 1984     GOOD             NGS
 HV1841  HISTORY     - 19920513 GOOD             NGS
 HV1841  HISTORY     - 19920615 GOOD             NGS
 HV1841  HISTORY     - 19980928 GOOD             NGS
 HV1841  HISTORY     - 19991122 GOOD             NGS
 HV1841  HISTORY     - 20000510 GOOD             NGS
 HV1841  HISTORY     - 20081222 GOOD             NGS
 HV1841  HISTORY     - 20090319 GOOD             GEOCAC
 HV1841  HISTORY     - 20120301 GOOD             NGS
 HV1841  HISTORY     - 20140408 GOOD             NGS
 HV1841  HISTORY     - 20230329 GOOD             NGS
 HV1841
 HV1841                          STATION DESCRIPTION
 HV1841
 HV1841'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1841'AT WASHINGTON.
 HV1841'AT WASHINGTON, D.C., 121.0 FEET SOUTH OF THE SOUTH FACE OF THE
 HV1841'WASHINGTON MONUMENT, 28.0 FEET SOUTH OF THE SOUTH CONCRETE
 HV1841'CURB OF THE CIRCLE DRIVE AROUND THE MONUMENT, 3 FEET SOUTH OF
 HV1841'THE SOUTH FACE OF A 15- X 21-FOOT CONCRETE BOX WHICH PROJECTS
 HV1841'2 1/2 FEET ABOVE THE SURFACE OF THE GROUND AND WHICH HAS A
 HV1841'METAL COVER, AND IS THE TOP OF AN OBELISK WHICH IS INSIDE A
 HV1841'BRICK WELL WITH A 24-INCH METAL COVER.
 HV1841
 HV1841                          STATION RECOVERY (1974)
 HV1841
 HV1841'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974
 HV1841'RECOVERED IN GOOD CONDITION.
 HV1841
 HV1841                          STATION RECOVERY (1984)
 HV1841
 HV1841'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984
 HV1841'RECOVERED IN GOOD CONDITION.
 HV1841
 HV1841                          STATION RECOVERY (1992)
 HV1841
 HV1841'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1841'IN WASHINGTON, D.C., AT THE WASHINGTON MONUMENT, THE POINT LEVELED IS
 HV1841'THE TOP OF AN OBELISK WHICH IS INSIDE A BRICK WELL, 36.9 M
 HV1841'(121.1 FT) SOUTH OF THE SOUTH FACE OF THE MONUMENT, 8.5 M (27.9 FT)
 HV1841'SOUTH OF THE SOUTH EDGE OF A CIRCLE DRIVEWAY, AND 0.9 M (3.0 FT) SOUTH
 HV1841'OF THE SOUTH FACE OF A 15 BY 21-FOOT CONCRETE BOX THAT PROJECTS
 HV1841'18-INCHES ABOVE THE GROUND SURFACE. NOTE--ACCESS TO THE DATUM POINT
 HV1841'IS THROUGH A 24-INCH METAL MANHOLE COVER.
 HV1841
 HV1841                          STATION RECOVERY (1992)
 HV1841
 HV1841'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1841'IN WASHINGTON, D.C., THE POINT LEVELED IS THE TOP OF AN OBELISK WHICH
 HV1841'IS INSIDE A BRICK WELL, 36.9 M (121.1 FT) SOUTH OF THE SOUTH FACE OF
 HV1841'THE WASHINGTON MONUMENT, 8.5 M (27.9 FT) SOUTH OF THE SOUTH CONCRETE
 HV1841'CURB OF A CIRCLE DRIVE AROUND THE MONUMENT, 0.9 M (3.0 FT) SOUTH OF
 HV1841'THE SOUTH FACE OF A 15- BY 21-FOOT CONCRETE BOX WHICH PROJECTS 0.8 M
 HV1841'(2.6 FT) ABOVE THE SURFACE OF THE GROUND.  NOTE--ACCESS TO THE
 HV1841'OBELISK IS THROUGH A 24-INCH METAL COVER.
 HV1841
 HV1841                          STATION RECOVERY (1998)
 HV1841
 HV1841'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1998 (RLA)
 HV1841'RECOVERED AS DESCRIBED.
 HV1841
 HV1841                          STATION RECOVERY (1999)
 HV1841
 HV1841'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1999 (RWA)
 HV1841'RECOVERED AS DESCRIBED.
 HV1841
 HV1841                          STATION RECOVERY (2000)
 HV1841
 HV1841'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 HV1841'RECOVERED AS DESCRIBED.
 HV1841
 HV1841                          STATION RECOVERY (2008)
 HV1841
 HV1841'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV1841'RECOVERED AS DESCRIBED.
 HV1841
 HV1841                          STATION RECOVERY (2009)
 HV1841
 HV1841'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV1841'RECOVERED IN GOOD CONDITION.
 HV1841
 HV1841                          STATION RECOVERY (2012)
 HV1841
 HV1841'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1841'RECOVERED AS DESCRIBED.
 HV1841
 HV1841                          STATION RECOVERY (2014)
 HV1841
 HV1841'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 HV1841'RECOVERED IN GOOD CONDITION.
 HV1841'
 HV1841'NOTE-THE TOP OF THE OBELISK IS 3 INCHES (8 CM) BY 3 INCHES (8 CM)
 HV1841'SQUARE AND IS 13 1/2 INCHES (34 CM) BELOW GROUND LEVEL.  THE WELL
 HV1841'ITSELF IS 167 1/2 INCHES (425 CM) DEEP.  THE TOP OF THE OBELISK HAS
 HV1841'BEEN DAMAGED AT THE WEST EDGE, LEAVING ABOUT A 1/2 INCH (13 MM) DEEP
 HV1841'GOUGE THAT EXTENDS DOWN THE WEST SIDE AND ABOUT 1 INCH (3 CM) ACROSS
 HV1841'THE TOP SURFACE, BUT ENOUGH OF THE TOP SURFACE REMAINS INTACT TO
 HV1841'CONTINUE TO USE THE MARK.
 HV1841
 HV1841                          STATION RECOVERY (2023)
 HV1841
 HV1841'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2023 (JL)
 HV1841'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1981 ***********************************************************************
 HV1981  DESIGNATION -  A 1
 HV1981  PID         -  HV1981
 HV1981  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1981  COUNTRY     -  US
 HV1981  USGS QUAD   -  ALEXANDRIA (2019)
 HV1981
 HV1981                         *CURRENT SURVEY CONTROL
 HV1981  ______________________________________________________________________
 HV1981* NAD 83(1986) POSITION- 38 52 20.     (N) 077 01 04.     (W)   SCALED
 HV1981* NAVD 88 ORTHO HEIGHT -     5.505 (meters)       18.06  (feet) ADJUSTED
 HV1981  ______________________________________________________________________
 HV1981  GEOID HEIGHT    -        -32.148 (meters)                     GEOID18
 HV1981  DYNAMIC HEIGHT  -          5.502 (meters)       18.05  (feet) COMP
 HV1981  MODELED GRAVITY -    980,096.9   (mgal)                       NAVD 88
 HV1981
 HV1981  VERT ORDER      -  FIRST     CLASS II
 HV1981
 HV1981.The horizontal coordinates were scaled from a map and have
 HV1981.an estimated accuracy of +/- 6 seconds.
 HV1981
 HV1981.The orthometric height was determined by differential leveling and
 HV1981.adjusted by the NATIONAL GEODETIC SURVEY
 HV1981.in June 1991.
 HV1981
 HV1981.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1981.GEOID18 height accuracy estimate available here.
 HV1981
 HV1981.Click photographs - Photos may exist for this station.
 HV1981
 HV1981.The dynamic height is computed by dividing the NAVD 88
 HV1981.geopotential number by the normal gravity value computed on the
 HV1981.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1981.degrees latitude (g = 980.6199 gals.).
 HV1981
 HV1981.The modeled gravity was interpolated from observed gravity values.
 HV1981
 HV1981
 HV1981_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ249045(NAD 83)
 HV1981
 HV1981                          SUPERSEDED SURVEY CONTROL
 HV1981
 HV1981  NGVD 29 (11/26/84)    5.742  (m)           18.84   (f) ADJUSTED    1 2
 HV1981
 HV1981.Superseded values are not recommended for survey control.
 HV1981
 HV1981.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1981.See file dsdata.pdf to determine how the superseded data were derived.
 HV1981
 HV1981_MARKER: DB = BENCH MARK DISK
 HV1981_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1981_SP_SET: WATER TABLE
 HV1981_STAMPING: A 1 1923
 HV1981_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1981
 HV1981  HISTORY     - Date     Condition        Report By
 HV1981  HISTORY     - 1923     MONUMENTED       CGS
 HV1981  HISTORY     - 1943     GOOD             CGS
 HV1981  HISTORY     - 19920512 MARK NOT FOUND   NGS
 HV1981
 HV1981                          STATION DESCRIPTION
 HV1981
 HV1981'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1981'AT WASHINGTON DC.
 HV1981'AT WASHINGTON, AT THE NORTHWEST CORNER OF THE INTERSECTION OF
 HV1981'FOURTH AND P STREETS SOUTHWEST, AT THE CAPITAL TRANSIT CO. CAR
 HV1981'BARN, 2 FEET WEST OF THE SOUTHEAST CORNER OF THE BARN, AND IN
 HV1981'THE TOP OF THE STONE WATER TABLE.  A STANDARD DISK, STAMPED A 1
 HV1981'1923.
 HV1981
 HV1981                          STATION RECOVERY (1943)
 HV1981
 HV1981'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943
 HV1981'RECOVERED IN GOOD CONDITION.
 HV1981
 HV1981                          STATION RECOVERY (1992)
 HV1981
 HV1981'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1981'THERE IS A NEW BUILDING AT THE DESCRIBED LOCATION.  ASSUMED DESTROYED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1275 ***********************************************************************
 HV1275  DESIGNATION -  A 2 1933
 HV1275  PID         -  HV1275
 HV1275  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1275  COUNTRY     -  US
 HV1275  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1275
 HV1275                         *CURRENT SURVEY CONTROL
 HV1275  ______________________________________________________________________
 HV1275* NAD 83(1986) POSITION- 38 54 49.     (N) 076 59 35.     (W)   SCALED
 HV1275* NAVD 88 ORTHO HEIGHT -    29.782 (meters)       97.71  (feet) ADJUSTED
 HV1275  ______________________________________________________________________
 HV1275  GEOID HEIGHT    -        -32.108 (meters)                     GEOID18
 HV1275  DYNAMIC HEIGHT  -         29.767 (meters)       97.66  (feet) COMP
 HV1275  MODELED GRAVITY -    980,106.5   (mgal)                       NAVD 88
 HV1275
 HV1275  VERT ORDER      -  FIRST     CLASS II
 HV1275
 HV1275.The horizontal coordinates were scaled from a map and have
 HV1275.an estimated accuracy of +/- 6 seconds.
 HV1275
 HV1275.The orthometric height was determined by differential leveling and
 HV1275.adjusted by the NATIONAL GEODETIC SURVEY
 HV1275.in June 1991.
 HV1275
 HV1275.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1275.GEOID18 height accuracy estimate available here.
 HV1275
 HV1275.Click photographs - Photos may exist for this station.
 HV1275
 HV1275.The dynamic height is computed by dividing the NAVD 88
 HV1275.geopotential number by the normal gravity value computed on the
 HV1275.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1275.degrees latitude (g = 980.6199 gals.).
 HV1275
 HV1275.The modeled gravity was interpolated from observed gravity values.
 HV1275
 HV1275
 HV1275_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ272090(NAD 83)
 HV1275
 HV1275                          SUPERSEDED SURVEY CONTROL
 HV1275
 HV1275  NGVD 29 (11/26/84)   30.012  (m)           98.46   (f) ADJUSTED    1 2
 HV1275
 HV1275.Superseded values are not recommended for survey control.
 HV1275
 HV1275.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1275.See file dsdata.pdf to determine how the superseded data were derived.
 HV1275
 HV1275_MARKER: DB = BENCH MARK DISK
 HV1275_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1275_SP_SET: BRIDGE
 HV1275_STAMPING: A 2 1933
 HV1275_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1275
 HV1275  HISTORY     - Date     Condition        Report By
 HV1275  HISTORY     - 1933     MONUMENTED       CGS
 HV1275  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV1275
 HV1275                          STATION DESCRIPTION
 HV1275
 HV1275'DESCRIBED BY COAST AND GEODETIC SURVEY 1933
 HV1275'AT WASHINGTON.
 HV1275'AT WASHINGTON, 1.4 MILES NORTHEAST ALONG THE BALTIMORE AND OHIO
 HV1275'RAILROAD FROM UNION STATION, AT THE Y-CONNECTION BETWEEN THE
 HV1275'WASHINGTON-BALTIMORE LINE AND THE METROPOLITAN BRANCH OF THE
 HV1275'B. AND O. R.R., ABOUT 1000 FEET WEST OF THE F TOWER, AT THE
 HV1275'BRIDGE OVER THE WASHINGTON TERMINAL CO. TRACK, IN THE TOP OF THE
 HV1275'SOUTH END OF THE WING WALL OF THE SOUTH STONE ABUTMENT, 20 FEET
 HV1275'SOUTHWEST OF THE SOUTHWEST RAIL OF THE UPPER TRACK, AND ABOUT
 HV1275'12 FEET BELOW THE BASE OF THE RAIL.  A STANDARD DISK, STAMPED A
 HV1275'2 1933.
 HV1275
 HV1275                          STATION RECOVERY (1971)
 HV1275
 HV1275'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971
 HV1275'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2029 ***********************************************************************
 HV2029  DESIGNATION -  A 3
 HV2029  PID         -  HV2029
 HV2029  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2029  COUNTRY     -  US
 HV2029  USGS QUAD   -  ALEXANDRIA (2019)
 HV2029
 HV2029                         *CURRENT SURVEY CONTROL
 HV2029  ______________________________________________________________________
 HV2029* NAD 83(1986) POSITION- 38 49 26.     (N) 077 01 16.     (W)   SCALED
 HV2029* NAVD 88 ORTHO HEIGHT -     9.910 (meters)       32.51  (feet) ADJUSTED
 HV2029  ______________________________________________________________________
 HV2029  GEOID HEIGHT    -        -32.221 (meters)                     GEOID18
 HV2029  DYNAMIC HEIGHT  -          9.905 (meters)       32.50  (feet) COMP
 HV2029  MODELED GRAVITY -    980,090.4   (mgal)                       NAVD 88
 HV2029
 HV2029  VERT ORDER      -  FIRST     CLASS II
 HV2029
 HV2029.The horizontal coordinates were scaled from a map and have
 HV2029.an estimated accuracy of +/- 6 seconds.
 HV2029
 HV2029.The orthometric height was determined by differential leveling and
 HV2029.adjusted by the NATIONAL GEODETIC SURVEY
 HV2029.in June 1991.
 HV2029
 HV2029.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2029.GEOID18 height accuracy estimate available here.
 HV2029
 HV2029.Click photographs - Photos may exist for this station.
 HV2029
 HV2029.The dynamic height is computed by dividing the NAVD 88
 HV2029.geopotential number by the normal gravity value computed on the
 HV2029.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2029.degrees latitude (g = 980.6199 gals.).
 HV2029
 HV2029.The modeled gravity was interpolated from observed gravity values.
 HV2029
 HV2029
 HV2029_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH245991(NAD 83)
 HV2029
 HV2029                          SUPERSEDED SURVEY CONTROL
 HV2029
 HV2029  NGVD 29 (11/26/84)   10.175  (m)           33.38   (f) ADJUSTED    1 2
 HV2029
 HV2029.Superseded values are not recommended for survey control.
 HV2029
 HV2029.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2029.See file dsdata.pdf to determine how the superseded data were derived.
 HV2029
 HV2029_MARKER: DB = BENCH MARK DISK
 HV2029_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2029_SP_SET: FOOTING
 HV2029_STAMPING: A 3 1950
 HV2029_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2029
 HV2029  HISTORY     - Date     Condition        Report By
 HV2029  HISTORY     - 1950     MONUMENTED       CGS
 HV2029
 HV2029                          STATION DESCRIPTION
 HV2029
 HV2029'DESCRIBED BY COAST AND GEODETIC SURVEY 1950
 HV2029'IN WASHINGTON.
 HV2029'IN SOUTHEAST WASHINGTON, ON THE GROUNDS ON THE NAVAL RESEARCH
 HV2029'LABORATORY AT BELLEVUE, 25 YARDS NORTHWEST OF THE INTERSECTION
 HV2029'OF LABORATORY ROAD AND THE FIRST STREET TO THE NORTH INSIDE
 HV2029'THE MAIN GATE (THE STREET BETWEEN THE ADMINISTRATION BUILDING
 HV2029'AND THE CHAPEL), AT A BEDSPRING RADAR TOWER, IN THE SOUTHEAST
 HV2029'FOOTING, AND ABOUT 1 FOOT ABOVE THE GROUND.  A STANDARD DISK,
 HV2029'STAMPED A 3 1950.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1276 ***********************************************************************
 HV1276  DESIGNATION -  A 5
 HV1276  PID         -  HV1276
 HV1276  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1276  COUNTRY     -  US
 HV1276  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1276
 HV1276                         *CURRENT SURVEY CONTROL
 HV1276  ______________________________________________________________________
 HV1276* NAD 83(1986) POSITION- 38 55 52.     (N) 076 58 20.     (W)   SCALED
 HV1276* NAVD 88 ORTHO HEIGHT -    44.803 (meters)      146.99  (feet) ADJUSTED
 HV1276  ______________________________________________________________________
 HV1276  GEOID HEIGHT    -        -32.119 (meters)                     GEOID18
 HV1276  DYNAMIC HEIGHT  -         44.780 (meters)      146.92  (feet) COMP
 HV1276  MODELED GRAVITY -    980,106.7   (mgal)                       NAVD 88
 HV1276
 HV1276  VERT ORDER      -  FIRST     CLASS I
 HV1276
 HV1276.The horizontal coordinates were scaled from a map and have
 HV1276.an estimated accuracy of +/- 6 seconds.
 HV1276
 HV1276.The orthometric height was determined by differential leveling and
 HV1276.adjusted by the NATIONAL GEODETIC SURVEY
 HV1276.in June 1991.
 HV1276
 HV1276.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1276.GEOID18 height accuracy estimate available here.
 HV1276
 HV1276.Click photographs - Photos may exist for this station.
 HV1276
 HV1276.The dynamic height is computed by dividing the NAVD 88
 HV1276.geopotential number by the normal gravity value computed on the
 HV1276.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1276.degrees latitude (g = 980.6199 gals.).
 HV1276
 HV1276.The modeled gravity was interpolated from observed gravity values.
 HV1276
 HV1276
 HV1276_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ290109(NAD 83)
 HV1276
 HV1276                          SUPERSEDED SURVEY CONTROL
 HV1276
 HV1276  NGVD 29 (11/26/84)   45.032  (m)          147.74   (f) ADJUSTED    1 1
 HV1276
 HV1276.Superseded values are not recommended for survey control.
 HV1276
 HV1276.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1276.See file dsdata.pdf to determine how the superseded data were derived.
 HV1276
 HV1276_MARKER: DB = BENCH MARK DISK
 HV1276_SETTING: 16 = (FASTENED TO) A METAL ROD WITH BASE PLATE BURIED/SCREWED
 HV1276+WITH SETTING: INTO GROUND
 HV1276_STAMPING: A 5 1971
 HV1276_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1276+STABILITY: SURFACE MOTION
 HV1276_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1276+SATELLITE: SATELLITE OBSERVATIONS - May 16, 2003
 HV1276
 HV1276  HISTORY     - Date     Condition        Report By
 HV1276  HISTORY     - 1971     MONUMENTED       NGS
 HV1276  HISTORY     - 20030516 GOOD             DEWDAV
 HV1276  HISTORY     - 20071116 GOOD             PB
 HV1276
 HV1276                          STATION DESCRIPTION
 HV1276
 HV1276'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1276'AT WASHINGTON.
 HV1276'AT WASHINGTON, D.C., AT THE SUBURB OF WOODRIDGE, AT THE
 HV1276'INTERSECTION OF U.S. HIGHWAY 1 (RHODE ISLAND AVENUE) AND 24TH
 HV1276'STREET, 105 FEET NORTH OF THE CENTER LINE OF THE STREET, 2 FEET
 HV1276'SOUTH OF POLE NUMBER 55660, 2.0 FEET NORTH OF A METAL WITNESS
 HV1276'POST, AND ON THE TOP OF A 4-FOOT SECTION OF COPPER COATED ROD
 HV1276'THAT IS ATTACHED TO A METAL BASE PLATE.  THE DISK IS 1 1/2 INCHES
 HV1276'BELOW THE SURFACE OF THE GROUND AND IS PROTECTED BY A METAL PIPE
 HV1276'THAT IS LEVEL WITH THE SURFACE OF THE GROUND.  NOTE-- THIS MARK
 HV1276'IS ALSO 0.15 MILE NORTHEAST ALONG U.S. HIGHWAY 1 FROM THE POST
 HV1276'OFFICE AT LANGDON.  NOTE-- THIS MARK IS ALSO ABOUT 1.0 MILE
 HV1276'SOUTHWEST ALONG U.S. HIGHWAY 1 FROM THE POST OFFICE AT MOUNT
 HV1276'RAINIER, MARYLAND.
 HV1276
 HV1276                          STATION RECOVERY (2003)
 HV1276
 HV1276'RECOVERY NOTE BY DEWBERRY DAVIS 2003 (KEC)
 HV1276'RECOVERED IN GOOD CONDITION.
 HV1276
 HV1276                          STATION RECOVERY (2007)
 HV1276
 HV1276'RECOVERY NOTE BY PBS&J 2007
 HV1276'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7847 ***********************************************************************
 HV7847  DESIGNATION -  A 6
 HV7847  PID         -  HV7847
 HV7847  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7847  COUNTRY     -  US
 HV7847  USGS QUAD   -  WASHINGTON WEST (2016)
 HV7847
 HV7847                         *CURRENT SURVEY CONTROL
 HV7847  ______________________________________________________________________
 HV7847* NAD 83(1986) POSITION- 38 55 57.     (N) 077 05 46.     (W)   SCALED
 HV7847* NAVD 88 ORTHO HEIGHT -    95.450 (meters)      313.16  (feet) ADJUSTED
 HV7847  ______________________________________________________________________
 HV7847  GEOID HEIGHT    -        -31.934 (meters)                     GEOID18
 HV7847  DYNAMIC HEIGHT  -         95.398 (meters)      312.98  (feet) COMP
 HV7847  MODELED GRAVITY -    980,082.0   (mgal)                       NAVD 88
 HV7847
 HV7847  VERT ORDER      -  FIRST     CLASS II
 HV7847
 HV7847.The horizontal coordinates were scaled from a map and have
 HV7847.an estimated accuracy of +/- 6 seconds.
 HV7847
 HV7847.The orthometric height was determined by differential leveling and
 HV7847.adjusted by the NATIONAL GEODETIC SURVEY
 HV7847.in June 1991.
 HV7847
 HV7847.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7847.GEOID18 height accuracy estimate available here.
 HV7847
 HV7847.Click photographs - Photos may exist for this station.
 HV7847
 HV7847.The dynamic height is computed by dividing the NAVD 88
 HV7847.geopotential number by the normal gravity value computed on the
 HV7847.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV7847.degrees latitude (g = 980.6199 gals.).
 HV7847
 HV7847.The modeled gravity was interpolated from observed gravity values.
 HV7847
 HV7847
 HV7847_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ183113(NAD 83)
 HV7847
 HV7847                          SUPERSEDED SURVEY CONTROL
 HV7847
 HV7847.No superseded survey control is available for this station.
 HV7847
 HV7847_MARKER: DB = BENCH MARK DISK
 HV7847_SETTING: 49 = STAINLESS STEEL ROD W/O SLEEVE (10 FT.+)
 HV7847_STAMPING: A 6 1979
 HV7847_PROJECTION: FLUSH
 HV7847_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV7847_ROD/PIPE-DEPTH: 4.57 meters
 HV7847
 HV7847  HISTORY     - Date     Condition        Report By
 HV7847  HISTORY     - 1979     MONUMENTED       NGS
 HV7847  HISTORY     - 19950607 GOOD             USPSQD
 HV7847
 HV7847                          STATION DESCRIPTION
 HV7847
 HV7847'DESCRIBED BY NATIONAL GEODETIC SURVEY 1979
 HV7847'IN SPRING VALLEY.
 HV7847'IN SPRING VALLEY, SET AT THE JUNCTION OF LOUGHBORO ROAD N.W. AND
 HV7847'AND ARIZONA AVENUE, 2 FEET NORTH OF BRACE POLE, PEP 223292, 4.5
 HV7847'FEET NORTH OF THE NORTH CURB OF LOUGHBORO ROAD, 10 FEET SOUTH OF THE
 HV7847'BASE OF THE GUY WIRE OF THE BRACE POLE, 62.5 FEET SOUTH OF THE
 HV7847'FRONT ENTRANCE DOOR TO THE HOUSE OF MR PAUL WATERS NUMBER 4911.
 HV7847'THE MARK IS ABOVE LEVEL WITH ROAD.
 HV7847
 HV7847                          STATION RECOVERY (1995)
 HV7847
 HV7847'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV7847'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8076 ***********************************************************************
 HV8076  DESIGNATION -  A 8
 HV8076  PID         -  HV8076
 HV8076  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8076  COUNTRY     -  US
 HV8076  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8076
 HV8076                         *CURRENT SURVEY CONTROL
 HV8076  ______________________________________________________________________
 HV8076* NAD 83(1986) POSITION- 38 53 22.31   (N) 077 02 06.58   (W)   HD_HELD1
 HV8076* NAVD 88 ORTHO HEIGHT -    12.492 (meters)       40.98  (feet) ADJUSTED
 HV8076  ______________________________________________________________________
 HV8076  GEOID HEIGHT    -        -32.088 (meters)                     GEOID18
 HV8076  DYNAMIC HEIGHT  -         12.485 (meters)       40.96  (feet) COMP
 HV8076  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 HV8076
 HV8076  VERT ORDER      -  FIRST     CLASS II
 HV8076
 HV8076.The horizontal coordinates were determined by differentially corrected
 HV8076.hand held GPS observations or other comparable positioning techniques
 HV8076.and have an estimated accuracy of +/- 3 meters.
 HV8076
 HV8076.The orthometric height was determined by differential leveling and
 HV8076.adjusted by the NATIONAL GEODETIC SURVEY
 HV8076.in April 2000.
 HV8076
 HV8076.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8076.GEOID18 height accuracy estimate available here.
 HV8076
 HV8076.Click photographs - Photos may exist for this station.
 HV8076
 HV8076.The dynamic height is computed by dividing the NAVD 88
 HV8076.geopotential number by the normal gravity value computed on the
 HV8076.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8076.degrees latitude (g = 980.6199 gals.).
 HV8076
 HV8076.The modeled gravity was interpolated from observed gravity values.
 HV8076
 HV8076
 HV8076_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2349006486(NAD 83)
 HV8076
 HV8076                          SUPERSEDED SURVEY CONTROL
 HV8076
 HV8076  NAVD 88 (06/15/91)   12.496  (m)           41.00   (f) SUPERSEDED  1 0
 HV8076  NGVD 29 (08/12/92)   12.725  (m)           41.75   (f) ADJUSTED    1 0
 HV8076
 HV8076.Superseded values are not recommended for survey control.
 HV8076
 HV8076.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8076.See file dsdata.pdf to determine how the superseded data were derived.
 HV8076
 HV8076_MARKER: Z = SEE DESCRIPTION
 HV8076_SETTING: 40 = SET IN A LARGE STRUCTURE WITH DEEP FOUNDATIONS
 HV8076_SP_SET: WASHINGTON MONUMENT WALL
 HV8076_MARK LOGO: NONE
 HV8076_PROJECTION: FLUSH
 HV8076_MAGNETIC: P = MARKER IS A STEEL PIPE
 HV8076_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 HV8076+STABILITY: POSITION/ELEVATION WELL
 HV8076_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV8076+SATELLITE: SATELLITE OBSERVATIONS - April 08, 2014
 HV8076
 HV8076  HISTORY     - Date     Condition        Report By
 HV8076  HISTORY     - 1984     MONUMENTED       NGS
 HV8076  HISTORY     - 19920512 GOOD             NGS
 HV8076  HISTORY     - 19920615 GOOD             NGS
 HV8076  HISTORY     - 19980928 GOOD             NGS
 HV8076  HISTORY     - 19991122 GOOD             NGS
 HV8076  HISTORY     - 20000510 GOOD             NGS
 HV8076  HISTORY     - 20030801 GOOD             GEOCAC
 HV8076  HISTORY     - 20081222 GOOD             NGS
 HV8076  HISTORY     - 20090319 GOOD             GEOCAC
 HV8076  HISTORY     - 20120329 GOOD             NGS
 HV8076  HISTORY     - 20140408 GOOD             NGS
 HV8076
 HV8076                          STATION DESCRIPTION
 HV8076
 HV8076'DESCRIBED BY NATIONAL GEODETIC SURVEY 1984
 HV8076'IN WASHINGTON DC.
 HV8076'THE MARK IS 0.2 M ABOVE THE GROUND.
 HV8076'AT THE WASHINGTON MONUMENT, SET IN THE WALL OF THE MONUMENT 0.9 METER
 HV8076'(3.0 FT) WEST OF THE NORTHEAST CORNER AND 0.2 METER (0.6 FT) ABOVE THE
 HV8076'GROUND.  THE MARK CONSIST OF A 1-INCH DIAMETER BY 3.5 INCHES LONG
 HV8076'STAINLESS STEEL PIPE SET IN THE WALL, AND A STAINLESS STEEL SCREW
 HV8076'PLUG, SCREWED INTO THE PIPE AND FLUSH WITH THE WALL.  THE POINT FOR
 HV8076'WHICH THE ELEVATION IS GIVEN IS EQUIDISTANCE FROM THE TOP OF THE PIPE
 HV8076'AND THE TOP OF THE PLUG.  (A HORIZONTAL LINE BETWEEN THE TOPS OF THE
 HV8076'TWO VISIBLE CIRCLES.)  FOR PRECISE LEVELING SURVEYS, THE PLUG IS
 HV8076'UNSCREWED AND A SPECIAL STAINLESS STEEL BOLT IS INSERTED IN THE PIPE
 HV8076'FOR THE REFERENCE POINT.
 HV8076
 HV8076                          STATION RECOVERY (1992)
 HV8076
 HV8076'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8076'IN WASHINGTON, D.C., A 1-INCH STAINLESS STEEL PLUG SCREWED INTO A
 HV8076'1-INCH DIAMETER BY 3.5-INCHES LONG STAINLESS STEEL PIPE SET
 HV8076'VERTICALLY NEAR THE NORTHEAST CORNER OF THE WASHINGTON MONUMENT, 0.9
 HV8076'M (3.0 FT) WEST OF THE NORTHEAST CORNER OF THE MONUMENT, AND 0.2 M
 HV8076'(0.7 FT) ABOVE THE GROUND SURFACE.  NOTE--FOR PRECISE LEVELING
 HV8076'SURVEYS, THE PLUG IS REMOVED AND A SPECIAL STAINLESS STEEL BOLT IS
 HV8076'INSERTED INTO THE PIPE FOR THE DATUM POINT.
 HV8076
 HV8076                          STATION RECOVERY (1992)
 HV8076
 HV8076'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8076'IN WASHINGTON, D.C., SET IN THE WALL OF THE WASHINGTON MONUMENT, 0.9 M
 HV8076'(3.0 FT) WEST OF THE NORTHEAST CORNER OF THE MONUMENT, AND 0.2 M
 HV8076'(0.7 FT) ABOVE THE GROUND SURFACE.  THE MARK CONSISTS OF A 1-INCH
 HV8076'DIAMETER BY 3.5-INCH LONG STAINLESS STEEL PIPE SET IN THE WALL, A
 HV8076'STAINLESS STEEL PLUG SCREWED INTO THE PIPE THAT IS FLUSH WITH THE
 HV8076'WALL.  THE POINT FOR WHICH THE ELEVATION IS GIVEN IS EQUIDISTANT FROM
 HV8076'THE TOP OF THE PIPE AND THE TOP OF THE PLUG (A HORIZONTAL LINE
 HV8076'BETWEEN THE TOPS OF THE TWO VISIBLE CIRCLES.)   NOTE--FOR PRECISE
 HV8076'LEVELING SURVEYS, THE PLUG IS UNSCREWED AND A SPECIAL STAINLESS STEEL
 HV8076'BOLT IS INSERTED IN THE PIPE FOR THE REFERENCE POINT.
 HV8076
 HV8076                          STATION RECOVERY (1998)
 HV8076
 HV8076'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1998 (RLA)
 HV8076'RECOVERED AS DESCRIBED.
 HV8076
 HV8076                          STATION RECOVERY (1999)
 HV8076
 HV8076'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1999 (RWA)
 HV8076'RECOVERED AS DESCRIBED.
 HV8076
 HV8076                          STATION RECOVERY (2000)
 HV8076
 HV8076'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 HV8076'RECOVERED AS DESCRIBED.
 HV8076
 HV8076                          STATION RECOVERY (2003)
 HV8076
 HV8076'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV8076'RECOVERED IN GOOD CONDITION.
 HV8076
 HV8076                          STATION RECOVERY (2008)
 HV8076
 HV8076'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV8076'RECOVERED AS DESCRIBED.
 HV8076
 HV8076                          STATION RECOVERY (2009)
 HV8076
 HV8076'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV8076'RECOVERED IN GOOD CONDITION.
 HV8076
 HV8076                          STATION RECOVERY (2012)
 HV8076
 HV8076'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DBC)
 HV8076'RECOVERED IN GOOD CONDITION.
 HV8076
 HV8076                          STATION RECOVERY (2014)
 HV8076
 HV8076'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 HV8076'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8775 ***********************************************************************
 HV8775  DESIGNATION -  A 9
 HV8775  PID         -  HV8775
 HV8775  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8775  COUNTRY     -  US
 HV8775  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8775
 HV8775                         *CURRENT SURVEY CONTROL
 HV8775  ______________________________________________________________________
 HV8775* NAD 83(1986) POSITION- 38 54 44.     (N) 077 05 07.     (W)   SCALED
 HV8775* NAVD 88 ORTHO HEIGHT -    62.726 (meters)      205.79  (feet) ADJUSTED
 HV8775  ______________________________________________________________________
 HV8775  GEOID HEIGHT    -        -31.979 (meters)                     GEOID18
 HV8775  DYNAMIC HEIGHT  -         62.693 (meters)      205.69  (feet) COMP
 HV8775  MODELED GRAVITY -    980,091.3   (mgal)                       NAVD 88
 HV8775
 HV8775  VERT ORDER      -  FIRST     CLASS II
 HV8775
 HV8775.The horizontal coordinates were scaled from a map and have
 HV8775.an estimated accuracy of +/- 6 seconds.
 HV8775
 HV8775.The orthometric height was determined by differential leveling and
 HV8775.adjusted by the NATIONAL GEODETIC SURVEY
 HV8775.in June 1991.
 HV8775
 HV8775.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8775.GEOID18 height accuracy estimate available here.
 HV8775
 HV8775.Click photographs - Photos may exist for this station.
 HV8775
 HV8775.The dynamic height is computed by dividing the NAVD 88
 HV8775.geopotential number by the normal gravity value computed on the
 HV8775.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8775.degrees latitude (g = 980.6199 gals.).
 HV8775
 HV8775.The modeled gravity was interpolated from observed gravity values.
 HV8775
 HV8775
 HV8775_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ192091(NAD 83)
 HV8775
 HV8775                          SUPERSEDED SURVEY CONTROL
 HV8775
 HV8775.No superseded survey control is available for this station.
 HV8775
 HV8775_MARKER: I = METAL ROD
 HV8775_SETTING: 15 = METAL ROD DRIVEN INTO GROUND. SEE TEXT FOR ADDITIONAL
 HV8775+WITH SETTING: INFORMATION.
 HV8775_STAMPING: A 9 1990
 HV8775_MARK LOGO: NGS
 HV8775_MAGNETIC: I = MARKER IS A STEEL ROD
 HV8775_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8775_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV8775+SATELLITE: SATELLITE OBSERVATIONS - 1990
 HV8775
 HV8775  HISTORY     - Date     Condition        Report By
 HV8775  HISTORY     - 1990     MONUMENTED       NGS
 HV8775
 HV8775                          STATION DESCRIPTION
 HV8775
 HV8775'DESCRIBED BY NATIONAL GEODETIC SURVEY 1990
 HV8775'IN WASHINGTON DC, AT THE INTERSECTION OF FOXHALL ROAD AND 45TH STREET,
 HV8775'A METAL ROD DRIVEN 2.1 METERS IN THE GROUND AND RECESSED 01
 HV8775'CENTIMETER, 11.0 M (36.09 FT) WEST OF THE CENTERLINE OF THE ROAD,
 HV8775'10.5 M (34.45 FT) NORTH OF THE EXTENDED CENTER OF THE STREET, 0.7 M
 HV8775'(2.30 FT) WEST OF THE WEST EDGE OF A SIDEWALK, 0.4 M (1.31 FT)
 HV8775'SOUTHEAST OF A FENCE CORNER, AND 0.3 M (0.98 FT) ABOVE THE LEVEL OF
 HV8775'THE STREET. NOTE--ACCESS TO THE DATUM POINT IS THROUGH A 5-INCH LOGO
 HV8775'CAP.  THE ROD WAS DRIVEN TO REFUSAL AND ANCHORED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4000 ***********************************************************************
 HV4000  DESIGNATION -  ACADEMY 1943
 HV4000  PID         -  HV4000
 HV4000  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4000  COUNTRY     -  US
 HV4000  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4000
 HV4000                         *CURRENT SURVEY CONTROL
 HV4000  ______________________________________________________________________
 HV4000* NAD 83(1993) POSITION- 38 56 33.18060(N) 077 03 31.77904(W)   ADJUSTED
 HV4000* NAVD 88 ORTHO HEIGHT -    91.    (meters)      299.    (feet) SCALED
 HV4000  ______________________________________________________________________
 HV4000  GEOID HEIGHT    -        -31.974 (meters)                     GEOID18
 HV4000  LAPLACE CORR    -         -2.97  (seconds)                    DEFLEC18
 HV4000  HORZ ORDER      -  SECOND
 HV4000
 HV4000.The horizontal coordinates were established by classical geodetic methods
 HV4000.and adjusted by the National Geodetic Survey in November 1994.
 HV4000
 HV4000.The orthometric height was scaled from a topographic map.
 HV4000
 HV4000.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4000.GEOID18 height accuracy estimate available here.
 HV4000
 HV4000.Click photographs - Photos may exist for this station.
 HV4000
 HV4000.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4000
 HV4000. The following values were computed from the NAD 83(1993) position.
 HV4000
 HV4000;                    North         East     Units Scale Factor Converg.
 HV4000;SPC MD       -   141,630.373   394,900.119   MT  0.99995052   -0 02 12.9
 HV4000;SPC MD       -   464,665.65  1,295,601.47   sFT  0.99995052   -0 02 12.9
 HV4000;SPC VA N     - 2,142,604.312 3,624,934.909   MT  0.99996444   +0 53 58.1
 HV4000;SPC VA N     - 7,029,527.65 11,892,807.28   sFT  0.99996444   +0 53 58.1
 HV4000;UTM  18      - 4,312,416.795   321,570.291   MT  0.99999204   -1 17 39.8
 HV4000
 HV4000!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4000!SPC MD       -   0.99999077  x   0.99995052  =   0.99994129
 HV4000!SPC VA N     -   0.99999077  x   0.99996444  =   0.99995521
 HV4000!UTM  18      -   0.99999077  x   0.99999204  =   0.99998281
 HV4000
 HV4000:                Primary Azimuth Mark                     Grid Az
 HV4000:SPC MD       -  HOME RESET                               091 26 32.3
 HV4000:SPC VA N     -  HOME RESET                               090 30 21.3
 HV4000:UTM  18      -  HOME RESET                               092 41 59.2
 HV4000
 HV4000_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2157012416(NAD 83)
 HV4000
 HV4000|---------------------------------------------------------------------|
 HV4000| PID    Reference Object                     Distance      Geod. Az  |
 HV4000|                                                           dddmmss.s |
 HV4000| HV4281 MEDICO                              APPROX. 4.4 KM 0350023.0 |
 HV4000| HV4444 SQUARE                              APPROX. 3.2 KM 0503829.3 |
 HV4000| HV4135 DOUBLE                              APPROX. 4.4 KM 0510627.5 |
 HV4000| HV4446 STEVENS                             APPROX. 3.6 KM 0544549.8 |
 HV4000| HV4324 GEOPHYSIC                           171.045 METERS 07302     |
 HV4000| HV7719 RADIO                               APPROX. 7.7 KM 0740815.6 |
 HV4000| HV4008 ACADEMY CROSS 1943                    3.790 METERS 08714     |
 HV4000| HV4147 HOME RESET                          APPROX. 4.1 KM 0912419.4 |
 HV4000| HV4275 MULTIPLICITY                        APPROX. 3.2 KM 0975222.8 |
 HV4000| HV4260 ITALIAN                             APPROX. 1.5 KM 0990500.1 |
 HV4000| HV4148 CLOCK                               APPROX. 4.2 KM 1005737.4 |
 HV4000| HV4443 TIVOLI                              APPROX. 2.6 KM 1190145.2 |
 HV4000| HV4131 HOWARD                              APPROX. 4.1 KM 1232259.3 |
 HV4000| HV4312 MAJESTIC                            APPROX. 2.3 KM 1240759.7 |
 HV4000| HV4439 UNITY                               APPROX. 2.7 KM 1330122.9 |
 HV4000| HV4404 SWANK                               APPROX. 1.2 KM 1663040.5 |
 HV4000| HV4325 KLINGLE                             APPROX. 1.0 KM 1702530.0 |
 HV4000| HV4405 WARDMAN                             APPROX. 2.0 KM 1704837.8 |
 HV4000| HV4316 ORDWAY                              APPROX. 0.8 KM 1794426.0 |
 HV4000| HV4314 BROAD                               APPROX. 0.5 KM 1822142.3 |
 HV4000| HV4392 SIREN                               APPROX. 1.2 KM 2075226.8 |
 HV4000| HV4399 SEDGWICK                            444.349 METERS 2111110.3 |
 HV4000| HV4196 CATHEDRAL                           APPROX. 1.6 KM 2164058.1 |
 HV4000| HV4096 FLAGPOLE                            APPROX. 1.8 KM 2201938.4 |
 HV4000| HV4398 TILDEN                              336.501 METERS 23235     |
 HV4000| HV4200 CATHOLIC                            APPROX. 3.2 KM 3334443.2 |
 HV4000| JV4269 BETHESDA NAVAL MED CTR BCN          APPROX. 7.3 KM 3345812.7 |
 HV4000|---------------------------------------------------------------------|
 HV4000
 HV4000                          SUPERSEDED SURVEY CONTROL
 HV4000
 HV4000  NAD 83(1991)-  38 56 33.17990(N)    077 03 31.78028(W) AD(       ) 2
 HV4000  NAD 83(1986)-  38 56 33.17946(N)    077 03 31.79046(W) AD(       ) 2
 HV4000  NAD 27      -  38 56 32.78100(N)    077 03 32.86700(W) AD(       ) 2
 HV4000
 HV4000.Superseded values are not recommended for survey control.
 HV4000
 HV4000.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4000.See file dsdata.pdf to determine how the superseded data were derived.
 HV4000
 HV4000_MARKER: Z = SEE DESCRIPTION
 HV4000_SETTING: 0 = UNSPECIFIED SETTING
 HV4000_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4000
 HV4000  HISTORY     - Date     Condition        Report By
 HV4000  HISTORY     - 1943     MONUMENTED       CGS
 HV4000  HISTORY     - 19950607 GOOD             USPSQD
 HV4000
 HV4000                          STATION DESCRIPTION
 HV4000
 HV4000'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4000'THE STATION IS THE APPROXIMATE CENTER OF THE OCTAGONAL TURRET,
 HV4000'ABOUT 6 FEET IN DIAMETER, ON THE SOUTHWEST CORNER OF THE
 HV4000'RECTANGULAR TOWER (THERE IS A SIMILAR TURRET AT EACH CORNER)
 HV4000'ON THE MAIN BUILDING OF THE HOLD CRESS ACADEMY, LOCATED AT 2935
 HV4000'UPTON ST., N.W.
 HV4000'
 HV4000'THE STATION IS MARKED BY A DEEP CROSS CUT IN THE MOUND OF
 HV4000'SOLDER, ABOUT THE SIZE OF A QUARTER DOLLAR, PLACED ON THE TIN
 HV4000'COVERING OF THE TURRET ROOF.
 HV4000
 HV4000                          STATION RECOVERY (1995)
 HV4000
 HV4000'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4000'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4008 ***********************************************************************
 HV4008  DESIGNATION -  ACADEMY CROSS 1943
 HV4008  PID         -  HV4008
 HV4008  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4008  COUNTRY     -  US
 HV4008  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4008
 HV4008                         *CURRENT SURVEY CONTROL
 HV4008  ______________________________________________________________________
 HV4008* NAD 83(1993) POSITION- 38 56 33.18652(N) 077 03 31.62184(W)   ADJUSTED
 HV4008* NAVD 88 ORTHO HEIGHT -    91.    (meters)      299.    (feet) SCALED
 HV4008  ______________________________________________________________________
 HV4008  GEOID HEIGHT    -        -31.974 (meters)                     GEOID18
 HV4008  LAPLACE CORR    -         -2.97  (seconds)                    DEFLEC18
 HV4008  HORZ ORDER      -  THIRD
 HV4008
 HV4008.The horizontal coordinates were established by classical geodetic methods
 HV4008.and adjusted by the National Geodetic Survey in November 1994.
 HV4008
 HV4008.The orthometric height was scaled from a topographic map.
 HV4008
 HV4008.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4008.GEOID18 height accuracy estimate available here.
 HV4008
 HV4008.Click photographs - Photos may exist for this station.
 HV4008
 HV4008.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4008
 HV4008. The following values were computed from the NAD 83(1993) position.
 HV4008
 HV4008;                    North         East     Units Scale Factor Converg.
 HV4008;SPC MD       -   141,630.553   394,903.904   MT  0.99995052   -0 02 12.8
 HV4008;SPC MD       -   464,666.24  1,295,613.89   sFT  0.99995052   -0 02 12.8
 HV4008;SPC VA N     - 2,142,604.554 3,624,938.692   MT  0.99996444   +0 53 58.2
 HV4008;SPC VA N     - 7,029,528.44 11,892,819.69   sFT  0.99996444   +0 53 58.2
 HV4008;UTM  18      - 4,312,416.892   321,574.080   MT  0.99999203   -1 17 39.7
 HV4008
 HV4008!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4008!SPC MD       -   0.99999077  x   0.99995052  =   0.99994129
 HV4008!SPC VA N     -   0.99999077  x   0.99996444  =   0.99995521
 HV4008!UTM  18      -   0.99999077  x   0.99999203  =   0.99998280
 HV4008
 HV4008_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2157412416(NAD 83)
 HV4008
 HV4008                          SUPERSEDED SURVEY CONTROL
 HV4008
 HV4008  NAD 83(1991)-  38 56 33.18582(N)    077 03 31.62309(W) AD(       ) 3
 HV4008  NAD 83(1986)-  38 56 33.18538(N)    077 03 31.63327(W) AD(       ) 3
 HV4008  NAD 27      -  38 56 32.78700(N)    077 03 32.71000(W) AD(       ) 3
 HV4008
 HV4008.Superseded values are not recommended for survey control.
 HV4008
 HV4008.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4008.See file dsdata.pdf to determine how the superseded data were derived.
 HV4008
 HV4008_MARKER: 74 = LARGE CROSS
 HV4008_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4008+SATELLITE: SATELLITE OBSERVATIONS - March 15, 2012
 HV4008
 HV4008  HISTORY     - Date     Condition        Report By
 HV4008  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4008  HISTORY     - 1971     GOOD             NGS
 HV4008  HISTORY     - 19950607 GOOD             USPSQD
 HV4008  HISTORY     - 20050806 GOOD             GEOCAC
 HV4008  HISTORY     - 20120315 GOOD             GEOCAC
 HV4008
 HV4008                          STATION DESCRIPTION
 HV4008
 HV4008'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4008'DISTANCE DETERMINED TO WEST SIDE OF TOP OF LARGE GILT CROSS,
 HV4008'0.21 METERS IN CROSS SECTION, ON THE FRONT WALL OF TOWER,
 HV4008'BETWEEN THE FRONT TWO OF FOUR TURRETS ON THE RECTANGULAR
 HV4008'TOWER ON THE MAIN BUILDING OF THE HOLY CROSS ACADEMY. LOCATED
 HV4008'AT 2935 UPTON ST., N.W.
 HV4008
 HV4008                          STATION RECOVERY (1971)
 HV4008
 HV4008'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4008'STATION WAS RECOVERED IN GOOD CONDITION, AS PREVIOUSLY DESCRIBED.
 HV4008'THE ORIGINAL DESCRIPTION IS ADEQUATE.
 HV4008
 HV4008                          STATION RECOVERY (1995)
 HV4008
 HV4008'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4008'RECOVERED IN GOOD CONDITION.
 HV4008
 HV4008                          STATION RECOVERY (2005)
 HV4008
 HV4008'RECOVERY NOTE BY GEOCACHING 2005 (APC)
 HV4008'BUILDING IS NOW PART OF HOWARD UNIVERSITY SCHOOL OF LAW.
 HV4008
 HV4008                          STATION RECOVERY (2012)
 HV4008
 HV4008'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV4008'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9075 ***********************************************************************
 HV9075  DESIGNATION -  AIRPLANE COMPASS 1924
 HV9075  PID         -  HV9075
 HV9075  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9075  COUNTRY     -  US
 HV9075  USGS QUAD   -  ALEXANDRIA (2019)
 HV9075
 HV9075                         *CURRENT SURVEY CONTROL
 HV9075  ______________________________________________________________________
 HV9075* NAD 83(1986) POSITION- 38 51 42.     (N) 077 00 28.     (W)   SCALED
 HV9075* NAVD 88 ORTHO HEIGHT -     1.62  (+/-2cm)        5.3   (feet) VERTCON3
 HV9075  ______________________________________________________________________
 HV9075  GEOID HEIGHT    -        -32.182 (meters)                     GEOID18
 HV9075  VERT ORDER      -  THIRD ? (See Below)
 HV9075
 HV9075.The horizontal coordinates were scaled from a map and have
 HV9075.an estimated accuracy of +/- 6 seconds.
 HV9075
 HV9075.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV9075.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV9075
 HV9075.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9075.GEOID18 height accuracy estimate available here.
 HV9075
 HV9075.The vertical order pertains to the NGVD 29 superseded value.
 HV9075
 HV9075.Click photographs - Photos may exist for this station.
 HV9075
 HV9075;                    North         East    Units  Estimated Accuracy
 HV9075;SPC MD       -   132,650.      399,330.      MT  (+/- 180 meters Scaled)
 HV9075
 HV9075_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ257033(NAD 83)
 HV9075
 HV9075                          SUPERSEDED SURVEY CONTROL
 HV9075
 HV9075  NAD 27      -  38 51 41.31700(N)    077 00 28.59500(W) AD(       ) 3
 HV9075  NGVD 29               1.87   (m)            6.1    (f) LEVELING    3  
 HV9075
 HV9075.Superseded values are not recommended for survey control.
 HV9075
 HV9075.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9075.See file dsdata.pdf to determine how the superseded data were derived.
 HV9075
 HV9075
 HV9075  HISTORY     - Date     Condition        Report By
 HV9075  HISTORY     - 1924     MONUMENTED       CGS
 HV9075  HISTORY     - 1939     GOOD             CGS
 HV9075
 HV9075                          STATION DESCRIPTION
 HV9075
 HV9075'DESCRIBED BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV9075'STATION RECOVERED AND IS ON THE E SHORE OF THE ANACOSTIA RIVER,
 HV9075'ACROSS THE RIVER FROM THE BUZZARD POINT PLANT OF THE P.E.P. COMPANY,
 HV9075'AND ON BOLLING FIELD, ABOUT 350 YARDS NE OF THE N ENTRANCE TO THE
 HV9075'NAVAL AIR STATION.  THE STATION IS ABOUT 165 FEET INSHORE FROM THE
 HV9075'MEAN HIGH-WATER LINE OF THE ANACOSTIA RIVER, 112 FEET SE
 HV9075'(INSHORE) OF THE CENTER LINE OF THE LEVEE PARALLELING THE RIVER,
 HV9075'AND 67.3 FEET SE OF THE NW EDGE OF THE CONCRETE SHOULDER ON
 HV9075'THE NW SIDE OF THE MACADAM ROAD WHICH PARALLELS THE LEVEE ON
 HV9075'THE INSIDE AND LEADS TO THE NAVAL AIR STATION.  THE MARK IS
 HV9075'FLUSH WITH THE SURFACE OF THE FLAT GRASSY LANDING FIELD,
 HV9075'AND CONSISTS OF A CONCRETE COMPASS ROSE HAVING A TOTAL
 HV9075'RADIUS OF ABOUT 35 FEET.  THE STATION IS THE CENTER OF THIS ROSE.
 HV9075'THE COMPASS IS CONSTRUCTED AS FOLLOWS--INNER CIRCLE OF ABOUT 25
 HV9075'FEET RADIUS IS SOLID CONCRETE EXCEPT FOR A SMALL OPENING WHICH
 HV9075'MARKS THE CENTER (THE STATION).  AROUND THIS SOLID
 HV9075'DISK IS A NARROW CONCRETE RING ABOUT 3 FEET WIDE WHICH IS
 HV9075'CONCENTRIC WITH THE CENTER DISK AND SEPARATED FROM IT BY
 HV9075'ABOUT 7 FEET OF GRASS.  NARROW CONCRETE STRIPS JOIN THE
 HV9075'CENTER DISK WITH THE OUTER RING AT THE N, S, E, AND W POINTS.
 HV9075'
 HV9075'TRIANGULATION STATION COMPASS, U.S.E., IS 79.21 FEET N 48 DEG
 HV9075'48 MIN 59 SEC W FROM THIS STATION, AND ON THE U.S.E. DESCRIPTION
 HV9075'AND SKETCH THIS STATION IS CALLED COMPASS REF.
 HV9075'
 HV9075'NOTE.--ORIGINAL DESCRIPTION IS CONTAINED IN A LETTER DATED
 HV9075'OCTOBER 4, 1924, A COPY OF WHICH IS FILED WITH THE 1924 FIELD
 HV9075'COMPUTATIONS 859-ETZ-81699.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4460 ***********************************************************************
 HV4460  DESIGNATION -  AMERICAN UNIV 2
 HV4460  PID         -  HV4460
 HV4460  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4460  COUNTRY     -  US
 HV4460  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4460
 HV4460                         *CURRENT SURVEY CONTROL
 HV4460  ______________________________________________________________________
 HV4460* NAD 83(1993) POSITION- 38 56 13.09330(N) 077 05 13.61637(W)   ADJUSTED
 HV4460* NAVD 88 ORTHO HEIGHT -   120.    (meters)      394.    (feet) SCALED
 HV4460  ______________________________________________________________________
 HV4460  GEOID HEIGHT    -        -31.938 (meters)                     GEOID18
 HV4460  LAPLACE CORR    -         -2.24  (seconds)                    DEFLEC18
 HV4460  HORZ ORDER      -  SECOND
 HV4460
 HV4460.The horizontal coordinates were established by classical geodetic methods
 HV4460.and adjusted by the National Geodetic Survey in November 1994.
 HV4460
 HV4460.The orthometric height was scaled from a topographic map.
 HV4460
 HV4460.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4460.GEOID18 height accuracy estimate available here.
 HV4460
 HV4460.Click photographs - Photos may exist for this station.
 HV4460
 HV4460.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4460
 HV4460. The following values were computed from the NAD 83(1993) position.
 HV4460
 HV4460;                    North         East     Units Scale Factor Converg.
 HV4460;SPC MD       -   141,012.925   392,447.169   MT  0.99995042   -0 03 16.8
 HV4460;SPC MD       -   462,639.90  1,287,553.75   sFT  0.99995042   -0 03 16.8
 HV4460;SPC VA N     - 2,141,946.849 3,622,492.345   MT  0.99996389   +0 52 54.5
 HV4460;SPC VA N     - 7,027,370.62 11,884,793.64   sFT  0.99996389   +0 52 54.5
 HV4460;UTM  18      - 4,311,853.298   319,104.267   MT  1.00000296   -1 18 43.3
 HV4460
 HV4460!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4460!SPC MD       -   0.99998622  x   0.99995042  =   0.99993664
 HV4460!SPC VA N     -   0.99998622  x   0.99996389  =   0.99995011
 HV4460!UTM  18      -   0.99998622  x   1.00000296  =   0.99998918
 HV4460
 HV4460:                Primary Azimuth Mark                     Grid Az
 HV4460:SPC MD       -  WASHINGTON TV STA WTOP TOWER             024 58 08.4
 HV4460:SPC VA N     -  WASHINGTON TV STA WTOP TOWER             024 01 57.1
 HV4460:UTM  18      -  WASHINGTON TV STA WTOP TOWER             026 13 34.9
 HV4460
 HV4460_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1910411853(NAD 83)
 HV4460
 HV4460|---------------------------------------------------------------------|
 HV4460| PID    Reference Object                     Distance      Geod. Az  |
 HV4460|                                                           dddmmss.s |
 HV4460| HV4481 WASHINGTON TV STA WTTG TOWER        APPROX. 2.2 KM 0101822.5 |
 HV4460| HV4186 WASHINGTON TV STA WTOP TOWER        APPROX. 1.6 KM 0245451.6 |
 HV4460| HV8190 AMERICAN UNIV                        28.539 METERS 03242     |
 HV4460| DC6654 AMERICAN UNIV 2 RM 3                               08327     |
 HV4460| DC6655 AMERICAN UNIV 2 RM 4                 28.724 METERS 16039     |
 HV4460|---------------------------------------------------------------------|
 HV4460
 HV4460                          SUPERSEDED SURVEY CONTROL
 HV4460
 HV4460  NAD 83(1991)-  38 56 13.09241(N)    077 05 13.61757(W) AD(       ) 2
 HV4460  NAD 83(1986)-  38 56 13.09933(N)    077 05 13.62170(W) AD(       ) 2
 HV4460  NAD 27      -  38 56 12.69873(N)    077 05 14.69598(W) AD(       ) 2
 HV4460
 HV4460.Superseded values are not recommended for survey control.
 HV4460
 HV4460.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4460.See file dsdata.pdf to determine how the superseded data were derived.
 HV4460
 HV4460_MARKER: DS = TRIANGULATION STATION DISK
 HV4460_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV4460_STAMPING: AMER UNIV 2 1967
 HV4460_MARK LOGO: CGS
 HV4460_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV4460+STABILITY: SURFACE MOTION
 HV4460
 HV4460  HISTORY     - Date     Condition        Report By
 HV4460  HISTORY     - 1967     MONUMENTED       CGS
 HV4460  HISTORY     - 1971     GOOD             NGS
 HV4460  HISTORY     - 19950601 MARK NOT FOUND   USPSQD
 HV4460
 HV4460                          STATION DESCRIPTION
 HV4460
 HV4460'DESCRIBED BY COAST AND GEODETIC SURVEY 1967 (KDB)
 HV4460'THE STATION IS LOCATED IN THE NORTHWEST SECTION OF WASHINGTON, ON
 HV4460'THE PROPERTY OF AMERICAN UNIVERSITY.  IT IS 75.7 FEET NORTH OF THE
 HV4460'NORTH CURB OF NEBRASKA AVENUE, 42.4 FEET WEST OF THE CENTERLINE OF
 HV4460'A DRIVEWAY LEADING THROUGH MARY EMERY HANNAY GATE, 32.6 FEET SOUTH
 HV4460'OF THE SOUTHWEST CORNER OF HURST HALL AND SET IN THE TOP OF A
 HV4460'CONCRETE POST FLUSH WITH THE SURFACE.  THE MARK IS STAMPED AMER
 HV4460'UNIV 2 1967.
 HV4460'
 HV4460'TO REACH THE STATION FROM DOWNTOWN WASHINGTON, FOLLOW MASSACHUSETTS
 HV4460'AVENUE IN A NORTHWESTERLY DIRECTION TO WARD CIRCLE AND NEBRASKA
 HV4460'AVENUE, TURN LEFT, SOUTHWEST ON NEBRASKA AVENUE AND GO ABOUT 0.2
 HV4460'MILE TO THE STATION ON THE RIGHT AS DESCRIBED.
 HV4460'
 HV4460'REFERENCE MARK 3 IS 10.8 FEET WEST OF THE CENTERLINE OF THE DRIVEWAY
 HV4460'THROUGH MARY EMERY HANNAY GATE 5.8 FEET NORTHEAST OF THE WEST PILLAR
 HV4460'OF THE GATE, 4 FEET NORTHEAST OF A LARGE MAPLE TREE AND SET IN THE
 HV4460'THE MARK IS A STANDARD REFERENCE MARK DISK STMAPED AMERT UNIV 2 NO
 HV4460'3 SIDEWALK, 6 INCHES WEST OF THE EAST EDGE OF THE CURB.
 HV4460'1967.
 HV4460'
 HV4460'REFERENCE MARK 4 IS 63.6 FEET SOUTH-SOUTHEAST OF A 4-FOOT MONUMENT
 HV4460'ERECTED BY THE D.A.R. IN 1925, 21 FEET NORTH OF THE CENTERLINE OF
 HV4460'NEBRASKA AVENUE, 8 FEET SOUTH OF THE CENTER OF A MANHOLE COVER AND
 HV4460'SET IN THE TOP OF THE CURB.  THE MARK IS A STANDARD REFERENCE MARK
 HV4460'DISK STAMPED AMER UNIV 2 NO 4 1967.
 HV4460'
 HV4460'NO AZIMUTH MARK WAS ESTABLISHED.
 HV4460
 HV4460                          STATION RECOVERY (1971)
 HV4460
 HV4460'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4460'THE STATION AND REFERENCE MARK NO. 4 WERE RECOVERED AS DESCRIBED
 HV4460'AND IN GOOD CONDITION.  REFERENCE MARK NO. 3 WAS FOUND TO HAVE THE
 HV4460'DISK BROKEN OFF AND ONLY THE DISK SHANK REMAINS CEMENTED IN DRILL
 HV4460'HOLE.  THE 1967 DESCRIPTION IS ADEQUATE.
 HV4460'
 HV4460'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DIST. OF COL.
 HV4460
 HV4460                          STATION RECOVERY (1995)
 HV4460
 HV4460'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4460'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ5421 ***********************************************************************
 AJ5421  DESIGNATION -  AMY
 AJ5421  PID         -  AJ5421
 AJ5421  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ5421  COUNTRY     -  US
 AJ5421  USGS QUAD   -  ANACOSTIA (2016)
 AJ5421
 AJ5421                         *CURRENT SURVEY CONTROL
 AJ5421  ______________________________________________________________________
 AJ5421* NAD 83(1986) POSITION- 38 51 52.9    (N) 076 59 45.2    (W)   HD_HELD2
 AJ5421* NAVD 88 ORTHO HEIGHT -     9.592 (meters)       31.47  (feet) ADJUSTED
 AJ5421  ______________________________________________________________________
 AJ5421  GEOID HEIGHT    -        -32.195 (meters)                     GEOID18
 AJ5421  DYNAMIC HEIGHT  -          9.587 (meters)       31.45  (feet) COMP
 AJ5421  MODELED GRAVITY -    980,093.8   (mgal)                       NAVD 88
 AJ5421
 AJ5421  VERT ORDER      -  SECOND    CLASS I
 AJ5421
 AJ5421.The horizontal coordinates were established by autonomous hand held GPS
 AJ5421.observations and have an estimated accuracy of +/- 10 meters.
 AJ5421
 AJ5421.The orthometric height was determined by differential leveling and
 AJ5421.adjusted by the NATIONAL GEODETIC SURVEY
 AJ5421.in October 2001.
 AJ5421
 AJ5421.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ5421.GEOID18 height accuracy estimate available here.
 AJ5421
 AJ5421.Click photographs - Photos may exist for this station.
 AJ5421
 AJ5421.The dynamic height is computed by dividing the NAVD 88
 AJ5421.geopotential number by the normal gravity value computed on the
 AJ5421.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ5421.degrees latitude (g = 980.6199 gals.).
 AJ5421
 AJ5421.The modeled gravity was interpolated from observed gravity values.
 AJ5421
 AJ5421
 AJ5421_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2683603654(NAD 83)
 AJ5421
 AJ5421                          SUPERSEDED SURVEY CONTROL
 AJ5421
 AJ5421.No superseded survey control is available for this station.
 AJ5421
 AJ5421_MARKER: DD = SURVEY DISK
 AJ5421_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 AJ5421_SP_SET: WALKWAY
 AJ5421_STAMPING: AMY 2001
 AJ5421_MARK LOGO: NONE
 AJ5421_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ5421_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 AJ5421_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 AJ5421+SATELLITE: SATELLITE OBSERVATIONS - January 16, 2011
 AJ5421
 AJ5421  HISTORY     - Date     Condition        Report By
 AJ5421  HISTORY     - UNK      MONUMENTED       NONE
 AJ5421  HISTORY     - 20010806 GOOD             NGS
 AJ5421  HISTORY     - 20110116 GOOD             NGS
 AJ5421
 AJ5421                          STATION DESCRIPTION
 AJ5421
 AJ5421'DESCRIBED BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 AJ5421'TO REACH FROM INTERSTATE 295 SOUTH AND HOWARD ROAD EXIT (3B) IN
 AJ5421'WASHINGTON DC, GO SOUTHWEST FOR 0.15 MILE (0.24 KM) ON EXIT RAMP (STAY
 AJ5421'IN RIGHT LANE) TO JUNCTION OF HOWARD ROAD, MAKE SHARP RIGHT ONTO
 AJ5421'ACCESS ROAD, THENCE NORTHEAST FOR 0.1 MILE (0.2 KM) TO THE ANACOSTIA
 AJ5421'METRO STATION AND MARK ON THE RIGHT, 32.6 FEET (9.9 M) SOUTHWEST OF
 AJ5421'CENTER OF A 2X2 FOOT STEEL TELE/ELEC JUNCTION BOX (SOUTH ONE OF TWO) ,
 AJ5421'51.5 FEET (15.7 M) SOUTH OF CENTERLINE OF ACCESS ROAD, 0.5 FEET (15.2
 AJ5421'CM) WEST OF THE SECOND CONCRETE COLUMN WEST OF STATION ENTRANCE.  0.6
 AJ5421'FEET (18.3 CM) SOUTH OF CONCRETE EDGE OF PLATFORM ENTRANCE TO METRO
 AJ5421'ENTRANCE.  6.0 FEET (1.8 M) ABOVE LEVEL OF ACCESS ROAD.  23.0 FEET
 AJ5421'(7.0 M) NORTH OF CONCRETE COLUMN ATTACHED TO NORTHWEST CORNER OF METRO
 AJ5421'ENTRANCE.  NOTE--NO INSCRIPTION ON DISK. NOTE--AMY 2001 WAS STAMPED
 AJ5421'FOR SURVEY.
 AJ5421
 AJ5421                          STATION RECOVERY (2011)
 AJ5421
 AJ5421'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2011 (DRD)
 AJ5421'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ5420 ***********************************************************************
 AJ5420  DESIGNATION -  ANA 2
 AJ5420  PID         -  AJ5420
 AJ5420  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ5420  COUNTRY     -  US
 AJ5420  USGS QUAD   -  ANACOSTIA (2016)
 AJ5420
 AJ5420                         *CURRENT SURVEY CONTROL
 AJ5420  ______________________________________________________________________
 AJ5420* NAD 83(1986) POSITION- 38 51 54.     (N) 076 59 47.     (W)   SCALED
 AJ5420* NAVD 88 ORTHO HEIGHT -     1.528 (meters)        5.01  (feet) ADJUSTED
 AJ5420  ______________________________________________________________________
 AJ5420  GEOID HEIGHT    -        -32.194 (meters)                     GEOID18
 AJ5420  DYNAMIC HEIGHT  -          1.527 (meters)        5.01  (feet) COMP
 AJ5420  MODELED GRAVITY -    980,094.0   (mgal)                       NAVD 88
 AJ5420
 AJ5420  VERT ORDER      -  SECOND    CLASS I
 AJ5420
 AJ5420.The horizontal coordinates were scaled from a map and have
 AJ5420.an estimated accuracy of +/- 6 seconds.
 AJ5420
 AJ5420.The orthometric height was determined by differential leveling and
 AJ5420.adjusted by the NATIONAL GEODETIC SURVEY
 AJ5420.in October 2001.
 AJ5420
 AJ5420.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ5420.GEOID18 height accuracy estimate available here.
 AJ5420
 AJ5420.Click photographs - Photos may exist for this station.
 AJ5420
 AJ5420.The dynamic height is computed by dividing the NAVD 88
 AJ5420.geopotential number by the normal gravity value computed on the
 AJ5420.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ5420.degrees latitude (g = 980.6199 gals.).
 AJ5420
 AJ5420.The modeled gravity was interpolated from observed gravity values.
 AJ5420
 AJ5420
 AJ5420_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ267036(NAD 83)
 AJ5420
 AJ5420                          SUPERSEDED SURVEY CONTROL
 AJ5420
 AJ5420.No superseded survey control is available for this station.
 AJ5420
 AJ5420_MARKER: DD = SURVEY DISK
 AJ5420_SETTING: 35 = SET IN A MAT FOUNDATION OR CONCRETE SLAB OTHER THAN
 AJ5420+WITH SETTING: PAVEMENT
 AJ5420_SP_SET: SAFETY WALKWAY
 AJ5420_STAMPING: ANA 2
 AJ5420_MARK LOGO: NONE
 AJ5420_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ5420_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AJ5420+STABILITY: SURFACE MOTION
 AJ5420
 AJ5420  HISTORY     - Date     Condition        Report By
 AJ5420  HISTORY     - 1992     MONUMENTED       WMATA
 AJ5420  HISTORY     - 20010806 GOOD             NGS
 AJ5420
 AJ5420                          STATION DESCRIPTION
 AJ5420
 AJ5420'DESCRIBED BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 AJ5420'FROM INTERSTATE 295 SOUTH AND HOWARD ROAD EXIT (3B) IN WASHINGTON DC
 AJ5420'GO SOUTHWEST 0.15 MILE (0.24 KM) ALONG EXIT RAMP (STAY IN RIGHT LANE)
 AJ5420'TO JUNCTION OF HOWARD ROAD, TURN EXTREME RIGHT ONTO A PAVED ROAD
 AJ5420'NORTHEAST FOR 0.10 MILE (0.16 KM) TO MARK AT THE ENTRANCE TO THE
 AJ5420'ANACOSTIA METRO STATION, THENCE GO THROUGH THE ENTRANCE AND DOWN TO
 AJ5420'BOTTOM OF THE ESCALATORS AT THE OUTBOUND TRACKS AT THE NORTHWEST SIDE
 AJ5420'OF A PLATFORM IN THE WALKWAY, 2.4 FEET (0.7 M) NORTHEAST OF EDGE OF
 AJ5420'WALKWAY, 8.2 FEET (2.5 M) NORTHWEST OF EDGE OF TILE FLOOR AND
 AJ5420'APPROXIMATELY 2.0 FEET (0.6 M) ABOVE TRACKS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1876 ***********************************************************************
 HV1876  DESIGNATION -  ARCHWAY=TIDAL BM USE
 HV1876  PID         -  HV1876
 HV1876  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1876  COUNTRY     -  US
 HV1876  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1876
 HV1876                         *CURRENT SURVEY CONTROL
 HV1876  ______________________________________________________________________
 HV1876* NAD 83(1986) POSITION- 38 54 15.6    (N) 077 04 13.0    (W)   HD_HELD2
 HV1876* NAVD 88 ORTHO HEIGHT -     4.941 (meters)       16.21  (feet) POSTED
 HV1876  ______________________________________________________________________
 HV1876  GEOID HEIGHT    -        -32.015 (meters)                     GEOID18
 HV1876  DYNAMIC HEIGHT  -          4.94  (meters)       16.2   (feet) COMP
 HV1876  MODELED GRAVITY -    980,092.3   (mgal)                       NAVD 88
 HV1876
 HV1876  VERT ORDER      -  * POSTED, SEE BELOW
 HV1876
 HV1876.The horizontal coordinates were established by autonomous hand held GPS
 HV1876.observations and have an estimated accuracy of +/- 10 meters.
 HV1876
 HV1876.The orthometric height was determined by differential leveling
 HV1876.and adjusted by the NATIONAL GEODETIC SURVEY in 1992.
 HV1876
 HV1876.* This is a POSTED BENCH MARK height.
 HV1876
 HV1876.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1876.GEOID18 height accuracy estimate available here.
 HV1876
 HV1876.Click photographs - Photos may exist for this station.
 HV1876
 HV1876.The dynamic height is computed by dividing the NAVD 88
 HV1876.geopotential number by the normal gravity value computed on the
 HV1876.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1876.degrees latitude (g = 980.6199 gals.).
 HV1876
 HV1876.The modeled gravity was interpolated from observed gravity values.
 HV1876
 HV1876
 HV1876_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2048108197(NAD 83)
 HV1876
 HV1876                          SUPERSEDED SURVEY CONTROL
 HV1876
 HV1876  NGVD 29 (11/26/84)    5.170  (m)           16.96   (f) ADJUSTED    1 2
 HV1876
 HV1876.Superseded values are not recommended for survey control.
 HV1876
 HV1876.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1876.See file dsdata.pdf to determine how the superseded data were derived.
 HV1876
 HV1876_MARKER: B = BOLT
 HV1876_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1876_SP_SET: WATER TABLE
 HV1876_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1876_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1876+SATELLITE: SATELLITE OBSERVATIONS - August 27, 2011
 HV1876
 HV1876  HISTORY     - Date     Condition        Report By
 HV1876  HISTORY     - UNK      MONUMENTED       USACE
 HV1876  HISTORY     - 1941     GOOD             CGS
 HV1876  HISTORY     - 1949     GOOD             CGS
 HV1876  HISTORY     - 20110827 GOOD             NGS
 HV1876
 HV1876                          STATION DESCRIPTION
 HV1876
 HV1876'DESCRIBED BY COAST AND GEODETIC SURVEY 1941
 HV1876'AT WASHINGTON.
 HV1876'AT WASHINGTON, ON K STREET NORTHWEST, WEST OF KEY BRIDGE, SOUTH
 HV1876'OF THE BALTIMORE AND OHIO RAILROAD TRACK, AT A STONE ARCH OVER
 HV1876'THE STREET (THE ONLY REMAINS OF THE OLD AQUEDUCT BRIDGE), AT THE
 HV1876'SOUTHEAST CORNER OF THE ARCH, IN THE TOP OF THE WATER TABLE, AND
 HV1876'ABOUT 4 FEET ABOVE THE GROUND.  THE TOP OF A 3/4-INCH BOLT, LEADED
 HV1876'VERTICALLY IN THE STONE AND PROJECTING ABOUT 1-3/4 INCHES ABOVE
 HV1876'THE WATER TABLE.
 HV1876
 HV1876                          STATION RECOVERY (1949)
 HV1876
 HV1876'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1949
 HV1876'RECOVERED IN GOOD CONDITION.
 HV1876
 HV1876                          STATION RECOVERY (2011)
 HV1876
 HV1876'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2011 (DRD)
 HV1876'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1228 ***********************************************************************
 HV1228  DESIGNATION -  ARMORY DCDHT
 HV1228  PID         -  HV1228
 HV1228  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1228  COUNTRY     -  US
 HV1228  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1228
 HV1228                         *CURRENT SURVEY CONTROL
 HV1228  ______________________________________________________________________
 HV1228* NAD 83(1986) POSITION- 38 53 16.     (N) 076 58 32.     (W)   SCALED
 HV1228* NAVD 88 ORTHO HEIGHT -    12.412 (meters)       40.72  (feet) ADJUSTED
 HV1228  ______________________________________________________________________
 HV1228  GEOID HEIGHT    -        -32.194 (meters)                     GEOID18
 HV1228  DYNAMIC HEIGHT  -         12.405 (meters)       40.70  (feet) COMP
 HV1228  MODELED GRAVITY -    980,096.7   (mgal)                       NAVD 88
 HV1228
 HV1228  VERT ORDER      -  FIRST     CLASS II
 HV1228
 HV1228.The horizontal coordinates were scaled from a map and have
 HV1228.an estimated accuracy of +/- 6 seconds.
 HV1228
 HV1228.The orthometric height was determined by differential leveling and
 HV1228.adjusted by the NATIONAL GEODETIC SURVEY
 HV1228.in June 1991.
 HV1228
 HV1228.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1228.GEOID18 height accuracy estimate available here.
 HV1228
 HV1228.Click photographs - Photos may exist for this station.
 HV1228
 HV1228.The dynamic height is computed by dividing the NAVD 88
 HV1228.geopotential number by the normal gravity value computed on the
 HV1228.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1228.degrees latitude (g = 980.6199 gals.).
 HV1228
 HV1228.The modeled gravity was interpolated from observed gravity values.
 HV1228
 HV1228
 HV1228_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ286061(NAD 83)
 HV1228
 HV1228                          SUPERSEDED SURVEY CONTROL
 HV1228
 HV1228  NGVD 29 (11/26/84)   12.646  (m)           41.49   (f) ADJUSTED    1 2
 HV1228
 HV1228.Superseded values are not recommended for survey control.
 HV1228
 HV1228.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1228.See file dsdata.pdf to determine how the superseded data were derived.
 HV1228
 HV1228_MARKER: Z = SEE DESCRIPTION
 HV1228_SETTING: 45 = UNSPECIFIED DEEP UNSLEEVED SETTING (10 FT.+)
 HV1228_SP_SET: UNSPECIFIED DEEP SET
 HV1228_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1228+STABILITY: SURFACE MOTION
 HV1228
 HV1228  HISTORY     - Date     Condition        Report By
 HV1228  HISTORY     - UNK      MONUMENTED       DCDHT
 HV1228  HISTORY     - 1929     GOOD             CGS
 HV1228
 HV1228                          STATION DESCRIPTION
 HV1228
 HV1228'DESCRIBED BY COAST AND GEODETIC SURVEY 1929
 HV1228'AT WASHINGTON.
 HV1228'AT WASHINGTON, ON INDEPENDENCE AVENUE SOUTHEAST, AT THE
 HV1228'D.C. GENERAL HOSPITAL, NORTH ACROSS THE AVENUE FROM THE MAIN
 HV1228'ENTRANCE TO THE CHILDRENS BUILDING, 30 PACES NORTH OF THE
 HV1228'CENTERLINE OF THE EASTBOUND LANE LEADING TO THE EAST CAPITOL
 HV1228'STREET BRIDGE, IN LINE WITH THE CENTERLINE OF A WALK LEADING TO
 HV1228'THE ENTRANCE TO THE CHILDRENS BUILDING, 30 PACES NORTH OF
 HV1228'THE CENTERLINE OF THE EASTBOUND LANE LEADING TO THE EAST
 HV1228'CAPITOL STREET BRIDGE, IN LINE WITH THE CENTERLINE OF A WALK
 HV1228'LEADING TO THE ENTRANCE TO THE CHILDRENS BUILDING, 8 FEET
 HV1228'NORTHEAST OF A 6-INCH ELM TREE, AND 12.5 FEET SOUTHWEST OF
 HV1228'THE 6-INCH TREE WHICH IS THE MOST NORTHERLY ONE OF A GROUP OF
 HV1228'TREES.  A DISTRICT OF COLUMBIA HIGHWAY DEPARTMENT SPECIAL DEEP
 HV1228'MARK UNDER A 10-INCH COVER MARKED WATER METER.  NOTE-- ACCESS TO
 HV1228'THIS MARK IS OBTAINED BY PREARRANGEMENT WITH ENGINEERS
 HV1228'OF THE DISTRICT OF COLUMBIA HIGHWAY DEPARTMENT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1229 ***********************************************************************
 HV1229  DESIGNATION -  ARMORY RESET
 HV1229  PID         -  HV1229
 HV1229  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1229  COUNTRY     -  US
 HV1229  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1229
 HV1229                         *CURRENT SURVEY CONTROL
 HV1229  ______________________________________________________________________
 HV1229* NAD 83(1986) POSITION- 38 53 16.     (N) 076 58 32.     (W)   SCALED
 HV1229* NAVD 88 ORTHO HEIGHT -    11.950 (meters)       39.21  (feet) ADJUSTED
 HV1229  ______________________________________________________________________
 HV1229  GEOID HEIGHT    -        -32.194 (meters)                     GEOID18
 HV1229  DYNAMIC HEIGHT  -         11.943 (meters)       39.18  (feet) COMP
 HV1229  MODELED GRAVITY -    980,096.7   (mgal)                       NAVD 88
 HV1229
 HV1229  VERT ORDER      -  FIRST     CLASS II
 HV1229
 HV1229.The horizontal coordinates were scaled from a map and have
 HV1229.an estimated accuracy of +/- 6 seconds.
 HV1229
 HV1229.The orthometric height was determined by differential leveling and
 HV1229.adjusted by the NATIONAL GEODETIC SURVEY
 HV1229.in June 1991.
 HV1229
 HV1229.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1229.GEOID18 height accuracy estimate available here.
 HV1229
 HV1229.Click photographs - Photos may exist for this station.
 HV1229
 HV1229.The dynamic height is computed by dividing the NAVD 88
 HV1229.geopotential number by the normal gravity value computed on the
 HV1229.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1229.degrees latitude (g = 980.6199 gals.).
 HV1229
 HV1229.The modeled gravity was interpolated from observed gravity values.
 HV1229
 HV1229
 HV1229_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ286061(NAD 83)
 HV1229
 HV1229                          SUPERSEDED SURVEY CONTROL
 HV1229
 HV1229  NGVD 29 (11/26/84)   12.182  (m)           39.97   (f) ADJUSTED    1 2
 HV1229
 HV1229.Superseded values are not recommended for survey control.
 HV1229
 HV1229.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1229.See file dsdata.pdf to determine how the superseded data were derived.
 HV1229
 HV1229_MARKER: Z = SEE DESCRIPTION
 HV1229_SETTING: 45 = UNSPECIFIED DEEP UNSLEEVED SETTING (10 FT.+)
 HV1229_SP_SET: UNSPECIFIED DEEP SET
 HV1229_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1229+STABILITY: SURFACE MOTION
 HV1229
 HV1229  HISTORY     - Date     Condition        Report By
 HV1229  HISTORY     - 1956     MONUMENTED       DCDHT
 HV1229
 HV1229                          STATION DESCRIPTION
 HV1229
 HV1229'DESCRIBED BY DC DEPARTMENT OF HIGHWAYS AND TRAFFIC 1956
 HV1229'AT WASHINGTON.
 HV1229'AT WASHINGTON, ON INDEPENDENCE AVENUE SOUTHEAST, AT THE
 HV1229'D.C. GENERAL HOSPITAL, NORTH ACROSS THE AVENUE FROM THE MAIN
 HV1229'ENTRANCE TO THE CHILDRENS BUILDING, 30 PACES NORTH OF THE
 HV1229'CENTERLINE OF THE EASTBOUND LANE LEADING TO THE EAST CAPITOL
 HV1229'STREET BRIDGE, IN LINE WITH THE CENTERLINE OF A WALK LEADING TO
 HV1229'THE ENTRANCE TO THE CHILDRENS BUILDING, 8 FEET NORTHEAST OF A
 HV1229'6-INCH ELM TREE, AND 12.5 FEET SOUTHWEST OF THE 6-INCH TREE
 HV1229'WHICH IS THE MOST NORTHERLY ONE OF GROUP OF TREES.  A DISTRICT
 HV1229'OF COLUMBIA HIGHWAY DEPARTMENT SPECIAL DEEP MARK UNDER A
 HV1229'10-INCH COVER MARKED WATER METER. NOTE-- ACCESS TO THIS MARK IS
 HV1229'OBTAINED BY PREARRANGEMENT WITH ENGINEERS OF THE DISTRICT OF
 HV1229'COLUMBIA HIGHWAY DEPARTMENT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1982 ***********************************************************************
 HV1982  TIDAL BM    -  This is a Tidal Bench Mark.
 HV1982  DESIGNATION -  B 1
 HV1982  PID         -  HV1982
 HV1982  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1982  COUNTRY     -  US
 HV1982  USGS QUAD   -  ALEXANDRIA (2019)
 HV1982
 HV1982                         *CURRENT SURVEY CONTROL
 HV1982  ______________________________________________________________________
 HV1982* NAD 83(1986) POSITION- 38 52 23.     (N) 077 01 13.     (W)   SCALED
 HV1982* NAVD 88 ORTHO HEIGHT -     3.164 (meters)       10.38  (feet) ADJUSTED
 HV1982  ______________________________________________________________________
 HV1982  GEOID HEIGHT    -        -32.142 (meters)                     GEOID18
 HV1982  DYNAMIC HEIGHT  -          3.163 (meters)       10.38  (feet) COMP
 HV1982  MODELED GRAVITY -    980,097.1   (mgal)                       NAVD 88
 HV1982
 HV1982  VERT ORDER      -  FIRST     CLASS II
 HV1982
 HV1982.The horizontal coordinates were scaled from a map and have
 HV1982.an estimated accuracy of +/- 6 seconds.
 HV1982
 HV1982.The orthometric height was determined by differential leveling and
 HV1982.adjusted by the NATIONAL GEODETIC SURVEY
 HV1982.in June 1991.
 HV1982
 HV1982.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1982.GEOID18 height accuracy estimate available here.
 HV1982
 HV1982.This Tidal Bench Mark is designated as VM 457
 HV1982.by the CENTER FOR OPERATIONAL OCEANOGRAPHIC PRODUCTS AND SERVICES.
 HV1982
 HV1982.Click photographs - Photos may exist for this station.
 HV1982
 HV1982.The dynamic height is computed by dividing the NAVD 88
 HV1982.geopotential number by the normal gravity value computed on the
 HV1982.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1982.degrees latitude (g = 980.6199 gals.).
 HV1982
 HV1982.The modeled gravity was interpolated from observed gravity values.
 HV1982
 HV1982
 HV1982_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ247046(NAD 83)
 HV1982
 HV1982                          SUPERSEDED SURVEY CONTROL
 HV1982
 HV1982  NGVD 29 (11/26/84)    3.401  (m)           11.16   (f) ADJUSTED    1 2
 HV1982
 HV1982.Superseded values are not recommended for survey control.
 HV1982
 HV1982.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1982.See file dsdata.pdf to determine how the superseded data were derived.
 HV1982
 HV1982_MARKER: DB = BENCH MARK DISK
 HV1982_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1982_SP_SET: FOUNDATION
 HV1982_STAMPING: B 1 1923
 HV1982_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1982
 HV1982  HISTORY     - Date     Condition        Report By
 HV1982  HISTORY     - 1923     MONUMENTED       CGS
 HV1982  HISTORY     - 1951     GOOD             CGS
 HV1982
 HV1982                          STATION DESCRIPTION
 HV1982
 HV1982'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1982'AT WASHINGTON.
 HV1982'AT WASHINGTON, ON THE SOUTHWEST SIDE OF MAINE AVENUE SOUTHWEST,
 HV1982'AT THE ENTRANCE TO THE COAST GUARD WHARF, AT THE SOUTHEAST
 HV1982'GATEPOST, AND IN THE TOP OF THE CONCRETE FOUNDATION ON THE SIDE
 HV1982'NEXT TO THE DRIVEWAY.  A STANDARD DISK, STAMPED B 1 1923.
 HV1982
 HV1982                          STATION RECOVERY (1951)
 HV1982
 HV1982'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1951
 HV1982'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1376 ***********************************************************************
 HV1376  DESIGNATION -  B 2
 HV1376  PID         -  HV1376
 HV1376  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1376  COUNTRY     -  US
 HV1376  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1376
 HV1376                         *CURRENT SURVEY CONTROL
 HV1376  ______________________________________________________________________
 HV1376* NAD 83(1986) POSITION- 38 55 56.     (N) 076 59 40.     (W)   SCALED
 HV1376* NAVD 88 ORTHO HEIGHT -    48.006 (meters)      157.50  (feet) ADJUSTED
 HV1376  ______________________________________________________________________
 HV1376  GEOID HEIGHT    -        -32.069 (meters)                     GEOID18
 HV1376  DYNAMIC HEIGHT  -         47.981 (meters)      157.42  (feet) COMP
 HV1376  MODELED GRAVITY -    980,108.8   (mgal)                       NAVD 88
 HV1376
 HV1376  VERT ORDER      -  FIRST     CLASS I
 HV1376
 HV1376.The horizontal coordinates were scaled from a map and have
 HV1376.an estimated accuracy of +/- 6 seconds.
 HV1376
 HV1376.The orthometric height was determined by differential leveling and
 HV1376.adjusted by the NATIONAL GEODETIC SURVEY
 HV1376.in June 1991.
 HV1376
 HV1376.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1376.GEOID18 height accuracy estimate available here.
 HV1376
 HV1376.Click photographs - Photos may exist for this station.
 HV1376
 HV1376.The dynamic height is computed by dividing the NAVD 88
 HV1376.geopotential number by the normal gravity value computed on the
 HV1376.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1376.degrees latitude (g = 980.6199 gals.).
 HV1376
 HV1376.The modeled gravity was interpolated from observed gravity values.
 HV1376
 HV1376
 HV1376_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ271111(NAD 83)
 HV1376
 HV1376                          SUPERSEDED SURVEY CONTROL
 HV1376
 HV1376  NGVD 29 (11/26/84)   48.233  (m)          158.24   (f) ADJUSTED    1 1
 HV1376
 HV1376.Superseded values are not recommended for survey control.
 HV1376
 HV1376.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1376.See file dsdata.pdf to determine how the superseded data were derived.
 HV1376
 HV1376_MARKER: DB = BENCH MARK DISK
 HV1376_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1376_SP_SET: BRIDGE OVERPASS
 HV1376_STAMPING: B 2 1933
 HV1376_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1376
 HV1376  HISTORY     - Date     Condition        Report By
 HV1376  HISTORY     - 1933     MONUMENTED       CGS
 HV1376  HISTORY     - 1971     GOOD             NGS
 HV1376
 HV1376                          STATION DESCRIPTION
 HV1376
 HV1376'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1376'AT WASHINGTON.
 HV1376'AT WASHINGTON, D.C., AT THE SUBDIVISION OF BROOKLAND, AT THE
 HV1376'MONROE STREET OVERPASS FOR THE BALTIMORE AND OHIO RAILROAD,
 HV1376'SET VERTICALLY IN THE EAST WALL OF THE OVERPASS, 21 FEET EAST
 HV1376'OF THE CENTER LINE OF THE EAST TRACK, AND ABOUT 4 FEET ABOVE
 HV1376'THE LEVEL OF THE TRACKS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2028 ***********************************************************************
 HV2028  DESIGNATION -  B 3
 HV2028  PID         -  HV2028
 HV2028  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2028  COUNTRY     -  US
 HV2028  USGS QUAD   -  ALEXANDRIA (2019)
 HV2028
 HV2028                         *CURRENT SURVEY CONTROL
 HV2028  ______________________________________________________________________
 HV2028* NAD 83(1986) POSITION- 38 49 20.     (N) 077 01 16.     (W)   SCALED
 HV2028* NAVD 88 ORTHO HEIGHT -     7.108 (meters)       23.32  (feet) ADJUSTED
 HV2028  ______________________________________________________________________
 HV2028  GEOID HEIGHT    -        -32.224 (meters)                     GEOID18
 HV2028  DYNAMIC HEIGHT  -          7.104 (meters)       23.31  (feet) COMP
 HV2028  MODELED GRAVITY -    980,090.2   (mgal)                       NAVD 88
 HV2028
 HV2028  VERT ORDER      -  FIRST     CLASS II
 HV2028
 HV2028.The horizontal coordinates were scaled from a map and have
 HV2028.an estimated accuracy of +/- 6 seconds.
 HV2028
 HV2028.The orthometric height was determined by differential leveling and
 HV2028.adjusted by the NATIONAL GEODETIC SURVEY
 HV2028.in June 1991.
 HV2028
 HV2028.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2028.GEOID18 height accuracy estimate available here.
 HV2028
 HV2028.Click photographs - Photos may exist for this station.
 HV2028
 HV2028.The dynamic height is computed by dividing the NAVD 88
 HV2028.geopotential number by the normal gravity value computed on the
 HV2028.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2028.degrees latitude (g = 980.6199 gals.).
 HV2028
 HV2028.The modeled gravity was interpolated from observed gravity values.
 HV2028
 HV2028
 HV2028_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH245989(NAD 83)
 HV2028
 HV2028                          SUPERSEDED SURVEY CONTROL
 HV2028
 HV2028  NGVD 29 (11/26/84)    7.373  (m)           24.19   (f) ADJUSTED    1 2
 HV2028
 HV2028.Superseded values are not recommended for survey control.
 HV2028
 HV2028.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2028.See file dsdata.pdf to determine how the superseded data were derived.
 HV2028
 HV2028_MARKER: DB = BENCH MARK DISK
 HV2028_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2028_SP_SET: LAMP BASE
 HV2028_STAMPING: B 3 1950
 HV2028_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2028
 HV2028  HISTORY     - Date     Condition        Report By
 HV2028  HISTORY     - 1950     MONUMENTED       CGS
 HV2028  HISTORY     - 19950619 MARK NOT FOUND   USPSQD
 HV2028
 HV2028                          STATION DESCRIPTION
 HV2028
 HV2028'DESCRIBED BY COAST AND GEODETIC SURVEY 1950
 HV2028'IN WASHINGTON.
 HV2028'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL RESEARCH
 HV2028'LABORATORY AT BELLEVUE, AT THE EAST END OF THE EAST MALL,
 HV2028'70 YARDS EAST OF THE BALTIMORE AND OHIO RAILROAD TRACKS, IN
 HV2028'THE BASE OF A LAMP STANDARD, AND FLUSH WITH THE GROUND.  A
 HV2028'STANDARD DISK, STAMPED B 3 1950.
 HV2028
 HV2028                          STATION RECOVERY (1995)
 HV2028
 HV2028'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV2028'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1277 ***********************************************************************
 HV1277  DESIGNATION -  B 5
 HV1277  PID         -  HV1277
 HV1277  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1277  COUNTRY     -  US
 HV1277  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1277
 HV1277                         *CURRENT SURVEY CONTROL
 HV1277  ______________________________________________________________________
 HV1277* NAD 83(1986) POSITION- 38 55 37.     (N) 076 58 51.     (W)   SCALED
 HV1277* NAVD 88 ORTHO HEIGHT -    49.164 (meters)      161.30  (feet) ADJUSTED
 HV1277  ______________________________________________________________________
 HV1277  GEOID HEIGHT    -        -32.107 (meters)                     GEOID18
 HV1277  DYNAMIC HEIGHT  -         49.138 (meters)      161.21  (feet) COMP
 HV1277  MODELED GRAVITY -    980,107.4   (mgal)                       NAVD 88
 HV1277
 HV1277  VERT ORDER      -  FIRST     CLASS I
 HV1277
 HV1277.The horizontal coordinates were scaled from a map and have
 HV1277.an estimated accuracy of +/- 6 seconds.
 HV1277
 HV1277.The orthometric height was determined by differential leveling and
 HV1277.adjusted by the NATIONAL GEODETIC SURVEY
 HV1277.in June 1991.
 HV1277
 HV1277.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1277.GEOID18 height accuracy estimate available here.
 HV1277
 HV1277.Click photographs - Photos may exist for this station.
 HV1277
 HV1277.The dynamic height is computed by dividing the NAVD 88
 HV1277.geopotential number by the normal gravity value computed on the
 HV1277.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1277.degrees latitude (g = 980.6199 gals.).
 HV1277
 HV1277.The modeled gravity was interpolated from observed gravity values.
 HV1277
 HV1277
 HV1277_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ282105(NAD 83)
 HV1277
 HV1277                          SUPERSEDED SURVEY CONTROL
 HV1277
 HV1277  NGVD 29 (11/26/84)   49.392  (m)          162.05   (f) ADJUSTED    1 1
 HV1277
 HV1277.Superseded values are not recommended for survey control.
 HV1277
 HV1277.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1277.See file dsdata.pdf to determine how the superseded data were derived.
 HV1277
 HV1277_MARKER: DB = BENCH MARK DISK
 HV1277_SETTING: 16 = (FASTENED TO) A METAL ROD WITH BASE PLATE BURIED/SCREWED
 HV1277+WITH SETTING: INTO GROUND
 HV1277_STAMPING: B 5 1971
 HV1277_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1277+STABILITY: SURFACE MOTION
 HV1277
 HV1277  HISTORY     - Date     Condition        Report By
 HV1277  HISTORY     - 1971     MONUMENTED       NGS
 HV1277  HISTORY     - 20071116 GOOD             PB
 HV1277  HISTORY     - 20100323 GOOD             USACE
 HV1277
 HV1277                          STATION DESCRIPTION
 HV1277
 HV1277'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1277'AT WASHINGTON.
 HV1277'AT WASHINGTON, D.C., ABOUT 0.4 MILE SOUTHWEST ALONG U.S. HIGHWAY
 HV1277'1 (RHODE ISLAND AVENUE) FROM THE POST OFFICE AT THE SUBURB OF
 HV1277'LANGDON, AT THE INTERSECTION OF THE HIGHWAY AND 17TH STREET, AT
 HV1277'THE 5TH DISTRICT POLICE STATION, 54 FEET NORTH OF THE CENTER
 HV1277'LINE OF THE HIGHWAY, 26 FEET SOUTH OF THE EAST ENTRANCE TO THE
 HV1277'PARKING AREA AT THE POLICE STATION, 2 FEET SOUTHWEST OF POWER
 HV1277'POLE NUMBER 53533C, 2 1/2 FEET NORTHWEST OF A CORNER FENCE POST,
 HV1277'4.5 FEET SOUTH OF A METAL WITNESS POST, ABOUT 1 FOOT ABOVE THE
 HV1277'LEVEL OF THE HIGHWAY, AND ON THE TOP OF A COPPER COATED ROD WHICH
 HV1277'IS 1 INCH BELOW THE SURFACE OF THE GROUND AND IS PROTECTED BY
 HV1277'A METAL PIPE WHICH IS LEVEL WITH THE SURFACE OF THE GROUND.
 HV1277
 HV1277                          STATION RECOVERY (2007)
 HV1277
 HV1277'RECOVERY NOTE BY PBS&J 2007
 HV1277'RECOVERED IN GOOD CONDITION.
 HV1277
 HV1277                          STATION RECOVERY (2010)
 HV1277
 HV1277'RECOVERY NOTE BY US ARMY CORPS OF ENGINEERS 2010 (JCR)
 HV1277'RECOVERED IN GOOD CONDITION.  MARK IS APPROXIMATELY 162.37' ABOVE THE
 HV1277'CONSTRUCTION/HYDRAULIC DATUM FOR THE ANACOSTIA RIVER LEVEE PROJECT
 HV1277'BASED ON RTK GPS SURVEYS BY USACE BALTIMORE IN MARCH 2010.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7848 ***********************************************************************
 HV7848  DESIGNATION -  B 6
 HV7848  PID         -  HV7848
 HV7848  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7848  COUNTRY     -  US
 HV7848  USGS QUAD   -  WASHINGTON WEST (2016)
 HV7848
 HV7848                         *CURRENT SURVEY CONTROL
 HV7848  ______________________________________________________________________
 HV7848* NAD 83(1986) POSITION- 38 56 49.4    (N) 077 04 45.7    (W)   HD_HELD2
 HV7848* NAVD 88 ORTHO HEIGHT -   118.305 (meters)      388.14  (feet) ADJUSTED
 HV7848  ______________________________________________________________________
 HV7848  GEOID HEIGHT    -        -31.937 (meters)                     GEOID18
 HV7848  DYNAMIC HEIGHT  -        118.241 (meters)      387.93  (feet) COMP
 HV7848  MODELED GRAVITY -    980,082.4   (mgal)                       NAVD 88
 HV7848
 HV7848  VERT ORDER      -  FIRST     CLASS II
 HV7848
 HV7848.The horizontal coordinates were established by autonomous hand held GPS
 HV7848.observations and have an estimated accuracy of +/- 10 meters.
 HV7848
 HV7848.The orthometric height was determined by differential leveling and
 HV7848.adjusted by the NATIONAL GEODETIC SURVEY
 HV7848.in June 1991.
 HV7848
 HV7848.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7848.GEOID18 height accuracy estimate available here.
 HV7848
 HV7848.Click photographs - Photos may exist for this station.
 HV7848
 HV7848.The dynamic height is computed by dividing the NAVD 88
 HV7848.geopotential number by the normal gravity value computed on the
 HV7848.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV7848.degrees latitude (g = 980.6199 gals.).
 HV7848
 HV7848.The modeled gravity was interpolated from observed gravity values.
 HV7848
 HV7848
 HV7848_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1980112957(NAD 83)
 HV7848
 HV7848                          SUPERSEDED SURVEY CONTROL
 HV7848
 HV7848.No superseded survey control is available for this station.
 HV7848
 HV7848_MARKER: DV = VERTICAL CONTROL DISK
 HV7848_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV7848_SP_SET: FOUNDATION
 HV7848_STAMPING: B 6 1979
 HV7848_MARK LOGO: NGS
 HV7848_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV7848_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV7848+SATELLITE: SATELLITE OBSERVATIONS - August 06, 2005
 HV7848
 HV7848  HISTORY     - Date     Condition        Report By
 HV7848  HISTORY     - 1979     MONUMENTED       NGS
 HV7848  HISTORY     - 19950617 GOOD             USPSQD
 HV7848  HISTORY     - 20050806 GOOD             GEOCAC
 HV7848
 HV7848                          STATION DESCRIPTION
 HV7848
 HV7848'DESCRIBED BY NATIONAL GEODETIC SURVEY 1979
 HV7848'IN TENLEYTOWN.
 HV7848'IN TENLEYTOWN, 0.1 MILE NORTHWEST ALONG WISCONSIN AVENUE FROM
 HV7848'TENLEY CIRCLE, SET IN THE FOUNDATION AT THE SOUTHEAST SIDE OF THE
 HV7848'MAIN ENTRANCE TO THE AUDITORIUM OF ST. ANNS PARISH AND SCHOOL, 1.5
 HV7848'FEET SOUTHWEST OF CORNER STONE CAST 1937, 15.3 FEET SOUTHEAST OF THE
 HV7848'CENTER OF THE ENTRANCE DOORS, 35 FEET SOUTHWEST OF THE SOUTHWEST
 HV7848'CURB OF THE AVENUE.
 HV7848'THE MARK IS 6 FT ABOVE AVENUE.
 HV7848
 HV7848                          STATION RECOVERY (1995)
 HV7848
 HV7848'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV7848'RECOVERED IN GOOD CONDITION.
 HV7848
 HV7848                          STATION RECOVERY (2005)
 HV7848
 HV7848'RECOVERY NOTE BY GEOCACHING 2005 (APC)
 HV7848'FOUND AS DESCRIBED AND SET HORIZONTALLY ON THE WEST SIDE OF WISCONSIN
 HV7848'AVENUE OPPOSITE GRANT STREET.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8077 ***********************************************************************
 HV8077  DESIGNATION -  B 8
 HV8077  PID         -  HV8077
 HV8077  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8077  COUNTRY     -  US
 HV8077  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8077
 HV8077                         *CURRENT SURVEY CONTROL
 HV8077  ______________________________________________________________________
 HV8077* NAD 83(1986) POSITION- 38 53 21.78   (N) 077 02 07.15   (W)   HD_HELD1
 HV8077* NAVD 88 ORTHO HEIGHT -    12.550 (meters)       41.17  (feet) ADJUSTED
 HV8077  ______________________________________________________________________
 HV8077  GEOID HEIGHT    -        -32.089 (meters)                     GEOID18
 HV8077  DYNAMIC HEIGHT  -         12.543 (meters)       41.15  (feet) COMP
 HV8077  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 HV8077
 HV8077  VERT ORDER      -  FIRST     CLASS II
 HV8077
 HV8077.The horizontal coordinates were determined by differentially corrected
 HV8077.hand held GPS observations or other comparable positioning techniques
 HV8077.and have an estimated accuracy of +/- 3 meters.
 HV8077
 HV8077.The orthometric height was determined by differential leveling and
 HV8077.adjusted by the NATIONAL GEODETIC SURVEY
 HV8077.in April 2000.
 HV8077
 HV8077.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8077.GEOID18 height accuracy estimate available here.
 HV8077
 HV8077.Click photographs - Photos may exist for this station.
 HV8077
 HV8077.The dynamic height is computed by dividing the NAVD 88
 HV8077.geopotential number by the normal gravity value computed on the
 HV8077.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8077.degrees latitude (g = 980.6199 gals.).
 HV8077
 HV8077.The modeled gravity was interpolated from observed gravity values.
 HV8077
 HV8077
 HV8077_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2347606470(NAD 83)
 HV8077
 HV8077                          SUPERSEDED SURVEY CONTROL
 HV8077
 HV8077  NAVD 88 (06/15/91)   12.554  (m)           41.19   (f) SUPERSEDED  1 0
 HV8077  NGVD 29 (08/12/92)   12.784  (m)           41.94   (f) ADJUSTED    1 0
 HV8077
 HV8077.Superseded values are not recommended for survey control.
 HV8077
 HV8077.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8077.See file dsdata.pdf to determine how the superseded data were derived.
 HV8077
 HV8077_MARKER: Z = SEE DESCRIPTION
 HV8077_SETTING: 40 = SET IN A LARGE STRUCTURE WITH DEEP FOUNDATIONS
 HV8077_SP_SET: WASHINGTON MONUMENT WALL
 HV8077_MARK LOGO: NONE
 HV8077_PROJECTION: FLUSH
 HV8077_MAGNETIC: P = MARKER IS A STEEL PIPE
 HV8077_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 HV8077+STABILITY: POSITION/ELEVATION WELL
 HV8077_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV8077+SATELLITE: SATELLITE OBSERVATIONS - April 07, 2014
 HV8077
 HV8077  HISTORY     - Date     Condition        Report By
 HV8077  HISTORY     - 1984     MONUMENTED       NGS
 HV8077  HISTORY     - 19920512 GOOD             NGS
 HV8077  HISTORY     - 19920615 GOOD             NGS
 HV8077  HISTORY     - 19980928 GOOD             NGS
 HV8077  HISTORY     - 19991122 GOOD             NGS
 HV8077  HISTORY     - 20000510 GOOD             NGS
 HV8077  HISTORY     - 200811   GOOD             NGS
 HV8077  HISTORY     - 20090319 GOOD             GEOCAC
 HV8077  HISTORY     - 20120329 GOOD             NGS
 HV8077  HISTORY     - 20140407 GOOD             NGS
 HV8077
 HV8077                          STATION DESCRIPTION
 HV8077
 HV8077'DESCRIBED BY NATIONAL GEODETIC SURVEY 1984
 HV8077'IN WASHINGTON DC.
 HV8077'THE MARK IS 0.2 M ABOVE THE GROUND.
 HV8077'AT THE WASHINGTON MONUMENT, SET IN THE WALL OF THE MONUMENT 0.9 METER
 HV8077'(3.0 FT) EAST OF THE SOUTHWEST CORNER AND40.2 METER (0.6 FT) ABOVE THE
 HV8077'GROUND.  THE MARK CONSIST OF A 1-INCH DIAMETER BY 3.5 INCHES LONG
 HV8077'STAINLESS STEEL PIPE SET IN THE WALL, AND A STAINLESS STEEL SCREW
 HV8077'PLUG, SCREWED INTO THE PIPE AND FLUSH WITH THE WALL.  THE POINT FOR
 HV8077'WHICH THE ELEVATION IS GIVEN IS EQUIDISTANCE FROM THE TOP OF THE PIPE
 HV8077'AND THE TOP OF THE PLUG.  (A HORIZONTAL LINE BETWEEN THE TOPS OF THE
 HV8077'TWO VISIBLE CIRCLES.)  FOR PRECISE LEVELING SURVEYS, THE PLUG IS
 HV8077'UNSCREWED AND A SPECIAL STAINLESS STEEL BOLT IS INSERTED IN THE PIPE
 HV8077'FOR THE REFERENCE POINT.
 HV8077
 HV8077                          STATION RECOVERY (1992)
 HV8077
 HV8077'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8077'IN WASHINGTON, D.C., A 1-INCH STAINLESS STEEL PLUG SCREWED INTO A
 HV8077'1-INCH DIAMETER BY 3.5-INCHES LONG STAINLESS STEEL PIPE SET
 HV8077'VERTICALLY NEAR THE SOUTHWEST CORNER OF THE WASHINGTON MONUMENT, 0.9
 HV8077'M (3.0 FT) EAST OF THE SOUTHWEST CORNER OF THE MONUMENT, AND 0.2 M
 HV8077'(0.7 FT) ABOVE THE GROUND SURFACE.  NOTE--FOR PRECISE LEVELING
 HV8077'SURVEYS, THE PLUG IS REMOVED AND A SPECIAL STAINLESS STEEL BOLT IS
 HV8077'INSERTED INTO THE PIPE FOR A DATUM POINT.
 HV8077
 HV8077                          STATION RECOVERY (1992)
 HV8077
 HV8077'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8077'IN WASHINGTON, D.C., AT THE WASHINGTON MONUMENT, SET IN THE WALL OF
 HV8077'THE MONUMENT 0.9 M (3.0 FT) EAST OF THE SOUTHWEST CORNER AND 0.2 M
 HV8077'(0.7 FT) ABOVE THE GROUND.  THE MARK CONSISTS OF A 1-INCH DIAMETER BY
 HV8077'3 1/2-INCH LONG STAINLESS STEEL PIPE SET IN THE WALL WITH A STAINLESS
 HV8077'STEEL PLUG SCREWED INTO THE PIPE AND FLUSH WITH THE WALL.  THE POINT
 HV8077'FOR WHICH THE ELEVATION IS GIVEN IS EQUIDISTANT FROM THE TOP OF THE
 HV8077'PIPE AND THE TOP OF THE PLUG (A HORIZONTAL LINE BETWEEN THE TOPS OF
 HV8077'THE TWO VISIBLE CIRCLES.)  NOTE--FOR PRECISE LEVELING SURVEYS THE
 HV8077'PLUG IS UNSCREWED AND A SPECIAL STAINLESS STEEL BOLT IS INSERTED IN
 HV8077'THE PIPE FOR THE REFERENCE POINT.
 HV8077
 HV8077                          STATION RECOVERY (1998)
 HV8077
 HV8077'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1998 (RLA)
 HV8077'RECOVERED AS DESCRIBED.
 HV8077
 HV8077                          STATION RECOVERY (1999)
 HV8077
 HV8077'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1999 (RWA)
 HV8077'RECOVERED AS DESCRIBED.
 HV8077
 HV8077                          STATION RECOVERY (2000)
 HV8077
 HV8077'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 HV8077'RECOVERED AS DESCRIBED.
 HV8077
 HV8077                          STATION RECOVERY (2008)
 HV8077
 HV8077'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV8077'RECOVERED AS DESCRIBED.
 HV8077
 HV8077                          STATION RECOVERY (2009)
 HV8077
 HV8077'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV8077'RECOVERED IN GOOD CONDITION.
 HV8077
 HV8077                          STATION RECOVERY (2012)
 HV8077
 HV8077'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV8077'RECOVERED IN GOOD CONDITION.
 HV8077
 HV8077                          STATION RECOVERY (2014)
 HV8077
 HV8077'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 HV8077'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8776 ***********************************************************************
 HV8776  DESIGNATION -  B 9
 HV8776  PID         -  HV8776
 HV8776  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8776  COUNTRY     -  US
 HV8776  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8776
 HV8776                         *CURRENT SURVEY CONTROL
 HV8776  ______________________________________________________________________
 HV8776* NAD 83(1986) POSITION- 38 55 49.44   (N) 077 06 42.84   (W)   HD_HELD1
 HV8776* NAVD 88 ORTHO HEIGHT -    17.094 (meters)       56.08  (feet) ADJUSTED
 HV8776  ______________________________________________________________________
 HV8776  GEOID HEIGHT    -        -31.923 (meters)                     GEOID18
 HV8776  DYNAMIC HEIGHT  -         17.085 (meters)       56.05  (feet) COMP
 HV8776  MODELED GRAVITY -    980,094.8   (mgal)                       NAVD 88
 HV8776
 HV8776  VERT ORDER      -  FIRST     CLASS II
 HV8776
 HV8776.The horizontal coordinates were determined by differentially corrected
 HV8776.hand held GPS observations or other comparable positioning techniques
 HV8776.and have an estimated accuracy of +/- 3 meters.
 HV8776
 HV8776.The orthometric height was determined by differential leveling and
 HV8776.adjusted by the NATIONAL GEODETIC SURVEY
 HV8776.in June 1991.
 HV8776
 HV8776.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8776.GEOID18 height accuracy estimate available here.
 HV8776
 HV8776.Click photographs - Photos may exist for this station.
 HV8776
 HV8776.The dynamic height is computed by dividing the NAVD 88
 HV8776.geopotential number by the normal gravity value computed on the
 HV8776.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8776.degrees latitude (g = 980.6199 gals.).
 HV8776
 HV8776.The modeled gravity was interpolated from observed gravity values.
 HV8776
 HV8776
 HV8776_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1693911173(NAD 83)
 HV8776
 HV8776                          SUPERSEDED SURVEY CONTROL
 HV8776
 HV8776.No superseded survey control is available for this station.
 HV8776
 HV8776_MARKER: DV = VERTICAL CONTROL DISK
 HV8776_SETTING: 38 = SET IN THE ABUTMENT OR PIER OF A LARGE BRIDGE
 HV8776_SP_SET: ABUTMENT
 HV8776_STAMPING: B 9 1990
 HV8776_MARK LOGO: NGS
 HV8776_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8776_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8776_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV8776+SATELLITE: SATELLITE OBSERVATIONS - September 23, 2012
 HV8776
 HV8776  HISTORY     - Date     Condition        Report By
 HV8776  HISTORY     - 1990     MONUMENTED       NGS
 HV8776  HISTORY     - 20110829 GOOD             NGS
 HV8776  HISTORY     - 20120923 GOOD             WOOLPT
 HV8776
 HV8776                          STATION DESCRIPTION
 HV8776
 HV8776'DESCRIBED BY NATIONAL GEODETIC SURVEY 1990
 HV8776'IN WASHINGTON DC, AT THE JUNCTION OF CANAL ROAD AND THE POTOMAC RIVER,
 HV8776'IN THE NORTH END OF THE EAST CONCRETE ABUTMENT WALKWAY OF CHAIN
 HV8776'BRIDGE SPANNING THE RIVER, 8.5 M (27.89 FT) SOUTH OF THE CENTER OF
 HV8776'THE ROAD, AND 0.2 M (0.66 FT) ABOVE THE LEVEL OF THE ROAD.  NOTE--THE
 HV8776'WALKWAY IS PART OF THE ABUTMENT.
 HV8776
 HV8776                          STATION RECOVERY (2011)
 HV8776
 HV8776'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2011 (DRD)
 HV8776'MARK IS NORTH OF THE CENTERLINE OF THE ROAD GOING ACROSS THE BRIDGE
 HV8776'AND WEST OF THE CENTERLINE OF CANAL ROAD.  UNABLE TO MEASURE DISTANCES
 HV8776'DUE TO VERY HEAVY TRAFFIC.
 HV8776
 HV8776                          STATION RECOVERY (2012)
 HV8776
 HV8776'RECOVERY NOTE BY WOOLPERT CONSULTANTS 2012 (JRS)
 HV8776'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4164 ***********************************************************************
 HV4164  DESIGNATION -  B AND O ROUNDHOUSE STACK
 HV4164  PID         -  HV4164
 HV4164  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4164  COUNTRY     -  US
 HV4164  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4164
 HV4164                         *CURRENT SURVEY CONTROL
 HV4164  ______________________________________________________________________
 HV4164* NAD 83(1993) POSITION- 38 54 05.18738(N) 077 00 21.01885(W)   ADJUSTED
 HV4164  ______________________________________________________________________
 HV4164  GEOID HEIGHT    -        -32.109 (meters)                     GEOID18
 HV4164  LAPLACE CORR    -         -3.50  (seconds)                    DEFLEC18
 HV4164  HORZ ORDER      -  THIRD
 HV4164
 HV4164.The horizontal coordinates were established by classical geodetic methods
 HV4164.and adjusted by the National Geodetic Survey in November 1994.
 HV4164
 HV4164.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4164.GEOID18 height accuracy estimate available here.
 HV4164
 HV4164.Click photographs - Photos may exist for this station.
 HV4164
 HV4164.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4164
 HV4164. The following values were computed from the NAD 83(1993) position.
 HV4164
 HV4164;                    North         East     Units Scale Factor Converg.
 HV4164;SPC MD       -   137,065.273   399,493.550   MT  0.99994995   -0 00 13.2
 HV4164;SPC MD       -   449,688.32  1,310,671.76   sFT  0.99994995   -0 00 13.2
 HV4164;SPC VA N     - 2,138,114.827 3,629,602.382   MT  0.99996063   +0 55 57.1
 HV4164;SPC VA N     - 7,014,798.39 11,908,120.48   sFT  0.99996063   +0 55 57.1
 HV4164;UTM  18      - 4,307,751.888   326,062.627   MT  0.99997255   -1 15 35.8
 HV4164
 HV4164_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2606207751(NAD 83)
 HV4164
 HV4164                          SUPERSEDED SURVEY CONTROL
 HV4164
 HV4164  NAD 83(1991)-  38 54 05.18620(N)    077 00 21.01972(W) AD(       ) 3
 HV4164  NAD 83(1986)-  38 54 05.18552(N)    077 00 21.03048(W) AD(       ) 3
 HV4164  NAD 27      -  38 54 04.79000(N)    077 00 22.11000(W) AD(       ) 3
 HV4164
 HV4164.Superseded values are not recommended for survey control.
 HV4164
 HV4164.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4164.See file dsdata.pdf to determine how the superseded data were derived.
 HV4164
 HV4164_MARKER: 63 = STACK
 HV4164
 HV4164  HISTORY     - Date     Condition        Report By
 HV4164  HISTORY     - 1934     FIRST OBSERVED   CGS
 HV4164  HISTORY     - 1939     GOOD             CGS
 HV4164  HISTORY     - 1961     GOOD             CGS
 HV4164  HISTORY     - 1971     GOOD             NGS
 HV4164
 HV4164                          STATION DESCRIPTION
 HV4164
 HV4164'DESCRIBED BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4164'THIS STATION RECOVERED.  NOT PREVIOUSLY DESCRIBED.  IT IS A
 HV4164'VERY TALL, RED BRICK STACK RISING FROM THE MIDDLE OF THE BUILDING
 HV4164'IN THE WASHINGTON TERMINAL COMPANY RAILROAD YARDS ABOUT 1/4 MILE
 HV4164'NE OF THE CENTER FRONT OF UNION STATION.  STACK IS AT THE
 HV4164'INTERSECTION OF FIRST AND I STREETS, (PROLONGED), NE.
 HV4164
 HV4164                          STATION RECOVERY (1961)
 HV4164
 HV4164'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1961 (JPP)
 HV4164'THIS STATION RECOVERED AS DESCRIBED AND WAS FOUND TO BE IN GOOD
 HV4164'CONDITION.
 HV4164
 HV4164                          STATION RECOVERY (1971)
 HV4164
 HV4164'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4164'STATION WAS RECOVERED AS PREVIOUSLY DESCRIBED.
 HV4164'
 HV4164'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DISTRICT OF
 HV4164'COLUMBIA
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4224 ***********************************************************************
 HV4224  DESIGNATION -  BARREL
 HV4224  PID         -  HV4224
 HV4224  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4224  COUNTRY     -  US
 HV4224  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4224
 HV4224                         *CURRENT SURVEY CONTROL
 HV4224  ______________________________________________________________________
 HV4224* NAD 83(1993) POSITION- 38 54 08.97162(N) 077 03 53.98794(W)   ADJUSTED
 HV4224* NAVD 88 ORTHO HEIGHT -     3.    (meters)       10.    (feet) SCALED
 HV4224  ______________________________________________________________________
 HV4224  GEOID HEIGHT    -        -32.026 (meters)                     GEOID18
 HV4224  LAPLACE CORR    -         -2.74  (seconds)                    DEFLEC18
 HV4224  HORZ ORDER      -  THIRD
 HV4224
 HV4224.The horizontal coordinates were established by classical geodetic methods
 HV4224.and adjusted by the National Geodetic Survey in November 1994.
 HV4224
 HV4224.The orthometric height was scaled from a topographic map.
 HV4224
 HV4224.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4224.GEOID18 height accuracy estimate available here.
 HV4224
 HV4224.Click photographs - Photos may exist for this station.
 HV4224
 HV4224.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4224
 HV4224. The following values were computed from the NAD 83(1993) position.
 HV4224
 HV4224;                    North         East     Units Scale Factor Converg.
 HV4224;SPC MD       -   137,183.953   394,362.137   MT  0.99994996   -0 02 26.9
 HV4224;SPC MD       -   450,077.69  1,293,836.44   sFT  0.99994996   -0 02 26.9
 HV4224;SPC VA N     - 2,138,149.640 3,624,469.659   MT  0.99996072   +0 53 44.2
 HV4224;SPC VA N     - 7,014,912.61 11,891,280.87   sFT  0.99996072   +0 53 44.2
 HV4224;UTM  18      - 4,307,983.055   320,934.876   MT  0.99999484   -1 17 49.8
 HV4224
 HV4224!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4224!SPC MD       -   1.00000459  x   0.99994996  =   0.99995455
 HV4224!SPC VA N     -   1.00000459  x   0.99996072  =   0.99996531
 HV4224!UTM  18      -   1.00000459  x   0.99999484  =   0.99999943
 HV4224
 HV4224:                Primary Azimuth Mark                     Grid Az
 HV4224:SPC MD       -  VIRGINIA BASE USE 1956                   256 01 37.1
 HV4224:SPC VA N     -  VIRGINIA BASE USE 1956                   255 05 26.0
 HV4224:UTM  18      -  VIRGINIA BASE USE 1956                   257 17 00.0
 HV4224
 HV4224_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2093407983(NAD 83)
 HV4224
 HV4224|---------------------------------------------------------------------|
 HV4224| PID    Reference Object                     Distance      Geod. Az  |
 HV4224|                                                           dddmmss.s |
 HV4224| HV4276 ELECTRIC                            249.729 METERS 10520     |
 HV4224| HV4250 D                                   340.176 METERS 14922     |
 HV4224| HV4535 DAM USE 1926 REF                    343.718 METERS 20203     |
 HV4224| HV4207 DAM                                 338.904 METERS 20514     |
 HV4224| HV4449 VIRGINIA BASE USE 1956              459.365 METERS 2555910.2 |
 HV4224| HV4448 VIRGINIA BASE USE 1932              461.381 METERS 2560439.4 |
 HV4224| DC6666 BARREL RM                                          28924     |
 HV4224| HV4458 WASHINGTON BASE USE 1932            383.770 METERS 29335     |
 HV4224| HV2175 WASH BASE USE 1956                  381.616 METERS 29335     |
 HV4224|---------------------------------------------------------------------|
 HV4224
 HV4224                          SUPERSEDED SURVEY CONTROL
 HV4224
 HV4224  NAD 83(1991)-  38 54 08.97038(N)    077 03 53.98950(W) AD(       ) 3
 HV4224  NAD 83(1986)-  38 54 08.97001(N)    077 03 53.99978(W) AD(       ) 3
 HV4224  NAD 27      -  38 54 08.57000(N)    077 03 55.07300(W) AD(       ) 3
 HV4224
 HV4224.Superseded values are not recommended for survey control.
 HV4224
 HV4224.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4224.See file dsdata.pdf to determine how the superseded data were derived.
 HV4224
 HV4224_MARKER: DD = SURVEY DISK
 HV4224_SETTING: 2 = IMBEDDED OR DRIVEN IN THE GROUND
 HV4224_SP_SET: CAST IRON PIPE FILLED WITH CONCR
 HV4224_STAMPING: 156
 HV4224_MARK LOGO: USACE
 HV4224_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4224
 HV4224  HISTORY     - Date     Condition        Report By
 HV4224  HISTORY     - 1926     MONUMENTED       USACE
 HV4224  HISTORY     - 1935     GOOD             CGS
 HV4224  HISTORY     - 1938     MARK NOT FOUND   CGS
 HV4224  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4224
 HV4224                          STATION DESCRIPTION
 HV4224
 HV4224'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1926
 HV4224'BARREL SET BY AVERY IN 1926 IS MARKED BY MARKER NO. 156 IN
 HV4224'4-INCH CAST-IRONPIPE 0.1 FOOT ABOVE SURFACE ON PROPERTY OF
 HV4224'BRUCE WARRING.
 HV4224
 HV4224                          STATION RECOVERY (1935)
 HV4224
 HV4224'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4224'STATION IS ON THE DISTRICT OF COLUMBIA BANK OF THE POTOMAC
 HV4224'RIVER IN GEORGETOWN ABOUT 300 YARDS BELOW THE KEY BRIDGE
 HV4224'BETWEEN THE BUILDING OF THE B. WARRING BARREL COMPANY AND THE
 HV4224'BANK OF THE RIVER.  THE STATION IS 13.7 FEET S OF THE SW
 HV4224'CORNER OF THE BUILDING 17 FEET NW OF THE CONTINUATION OF THE
 HV4224'SE LINE OF THE BUILDING AND 9.1 FEET NE OF THE TOP OF THE
 HV4224'RIVER BANK.
 HV4224'
 HV4224'THE STATION IS MARKED WITH A U.S.E.D. TABLET SET IN CONCRETE
 HV4224'IN A 4-INCH IRON PIPE.  THE TABLET IS STAMED 156.  THE MARK
 HV4224'PROJECTS ABOUT 4 INCHES ABOVE THE GROUND.
 HV4224
 HV4224                          STATION RECOVERY (1938)
 HV4224
 HV4224'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4224'DESTROYED DURING 1936 FLOOD ACCORDING TO ONE OF THE PERSONNEL
 HV4224'OF WARRING BARREL COMPANY WHO HAD KNOWLEDGE OF THE MARK.
 HV4224
 HV4224                          STATION RECOVERY (1971)
 HV4224
 HV4224'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4224'IT WAS CONFERMED THAT THIS STATION IS DESTROYED, AS WAS
 HV4224'REPORTED IN 1938.
 HV4224'
 HV4224'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4299 ***********************************************************************
 HV4299  DESIGNATION -  BASE
 HV4299  PID         -  HV4299
 HV4299  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4299  COUNTRY     -  US
 HV4299  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4299
 HV4299                         *CURRENT SURVEY CONTROL
 HV4299  ______________________________________________________________________
 HV4299* NAD 83(1993) POSITION- 38 53 45.51259(N) 077 03 35.70573(W)   ADJUSTED
 HV4299* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV4299  ______________________________________________________________________
 HV4299  GEOID HEIGHT    -        -32.045 (meters)                     GEOID18
 HV4299  LAPLACE CORR    -         -2.63  (seconds)                    DEFLEC18
 HV4299  HORZ ORDER      -  THIRD
 HV4299
 HV4299.The horizontal coordinates were established by classical geodetic methods
 HV4299.and adjusted by the National Geodetic Survey in November 1994.
 HV4299
 HV4299.The orthometric height was scaled from a topographic map.
 HV4299
 HV4299.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4299.GEOID18 height accuracy estimate available here.
 HV4299
 HV4299.Click photographs - Photos may exist for this station.
 HV4299
 HV4299.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4299
 HV4299. The following values were computed from the NAD 83(1993) position.
 HV4299
 HV4299;                    North         East     Units Scale Factor Converg.
 HV4299;SPC MD       -   136,460.280   394,802.166   MT  0.99994991   -0 02 15.4
 HV4299;SPC MD       -   447,703.44  1,295,280.11   sFT  0.99994991   -0 02 15.4
 HV4299;SPC VA N     - 2,137,433.246 3,624,921.461   MT  0.99996017   +0 53 55.6
 HV4299;SPC VA N     - 7,012,562.24 11,892,763.16   sFT  0.99996017   +0 53 55.6
 HV4299;UTM  18      - 4,307,249.876   321,358.952   MT  0.99999298   -1 17 37.6
 HV4299
 HV4299!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4299!SPC MD       -   1.00000491  x   0.99994991  =   0.99995482
 HV4299!SPC VA N     -   1.00000491  x   0.99996017  =   0.99996508
 HV4299!UTM  18      -   1.00000491  x   0.99999298  =   0.99999789
 HV4299
 HV4299:                Primary Azimuth Mark                     Grid Az
 HV4299:SPC MD       -  PARK USE 1932                            131 29 17.5
 HV4299:SPC VA N     -  PARK USE 1932                            130 33 06.5
 HV4299:UTM  18      -  PARK USE 1932                            132 44 39.7
 HV4299
 HV4299_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2135807249(NAD 83)
 HV4299
 HV4299|---------------------------------------------------------------------|
 HV4299| PID    Reference Object                     Distance      Geod. Az  |
 HV4299|                                                           dddmmss.s |
 HV4299| HV4403 WALL USE 1932                       397.854 METERS 04610     |
 HV4299| HV4326 CRANFORD                            292.793 METERS 09242     |
 HV4299| HV4331 PARK USE 1932                       481.248 METERS 1312702.1 |
 HV4299| HV4300 F USE 1932                          329.917 METERS 17908     |
 HV4299| HV4400 SCOW USE 1932                       289.770 METERS 34906     |
 HV4299|---------------------------------------------------------------------|
 HV4299
 HV4299                          SUPERSEDED SURVEY CONTROL
 HV4299
 HV4299  NAD 83(1991)-  38 53 45.51134(N)    077 03 35.70728(W) AD(       ) 3
 HV4299  NAD 83(1986)-  38 53 45.51105(N)    077 03 35.71775(W) AD(       ) 3
 HV4299  NAD 27      -  38 53 45.11200(N)    077 03 36.79300(W) AD(       ) 3
 HV4299
 HV4299.Superseded values are not recommended for survey control.
 HV4299
 HV4299.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4299.See file dsdata.pdf to determine how the superseded data were derived.
 HV4299
 HV4299_MARKER: DD = SURVEY DISK
 HV4299_SETTING: 17 = SET INTO TOP OF METAL PIPE DRIVEN INTO GROUND
 HV4299_MARK LOGO: USACE
 HV4299_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4299
 HV4299  HISTORY     - Date     Condition        Report By
 HV4299  HISTORY     - 1932     MONUMENTED       CGS
 HV4299  HISTORY     - 1946     GOOD             CGS
 HV4299
 HV4299                          STATION DESCRIPTION
 HV4299
 HV4299'DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4299'STATION SITE IS ON THEODORE ROOSEVELT ISLAND, COMMONLY CALLED
 HV4299'ROOSEVELT ISLAND, BUT FORMERLY KNOWN AS ANALOSTON ISLAND.
 HV4299'IT LIES BETWEEN THE POTOMAC AND LITTLE RIVERS, BETWEEN THE
 HV4299'KEY AND THE MEMORIAL BRIDGES ACROSS THE POTOMAC, ABREAST
 HV4299'OF H STREET IN THE DISTRICT OF COLUMBIA, NEAR THE E CENTRAL
 HV4299'SHORE OF THE ISLAND.
 HV4299'
 HV4299'STATION IS A STANDARD U.S.E. DISK SET IN A 4-INCH CAST-IRON
 HV4299'PIPE FILLED WITH CONCRETE 0.7 FOOT BELOW SURFACE, ABOUT 44-1/2
 HV4299'FEET INSHORE FROM HIGH-WATER LINE, AND IS IN THE WOODS ABOUT
 HV4299'1,500 FEET ALONG THE SHORE ABOVE THE LOWER END OF THE ISLAND.
 HV4299'AREA IS PRESENTLY FILLED.
 HV4299'
 HV4299'STATION IS APPROXIMATELY IN LINE WITH HEURICH BREWERY CUPOLA AND
 HV4299'WASHINGTON MONUMENT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV3985 ***********************************************************************
 HV3985  DESIGNATION -  BATTERY
 HV3985  PID         -  HV3985
 HV3985  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV3985  COUNTRY     -  US
 HV3985  USGS QUAD   -  WASHINGTON WEST (2016)
 HV3985
 HV3985                         *CURRENT SURVEY CONTROL
 HV3985  ______________________________________________________________________
 HV3985* NAD 83(1993) POSITION- 38 55 49.66234(N) 077 05 45.53448(W)   ADJUSTED
 HV3985* NAVD 88 ORTHO HEIGHT -   114.    (meters)      374.    (feet) SCALED
 HV3985  ______________________________________________________________________
 HV3985  GEOID HEIGHT    -        -31.937 (meters)                     GEOID18
 HV3985  LAPLACE CORR    -         -1.82  (seconds)                    DEFLEC18
 HV3985  HORZ ORDER      -  SECOND
 HV3985
 HV3985.The horizontal coordinates were established by classical geodetic methods
 HV3985.and adjusted by the National Geodetic Survey in November 1994.
 HV3985
 HV3985.The orthometric height was scaled from a topographic map.
 HV3985
 HV3985.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV3985.GEOID18 height accuracy estimate available here.
 HV3985
 HV3985.Click photographs - Photos may exist for this station.
 HV3985
 HV3985.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV3985
 HV3985. The following values were computed from the NAD 83(1993) position.
 HV3985
 HV3985;                    North         East     Units Scale Factor Converg.
 HV3985;SPC MD       -   140,291.186   391,677.725   MT  0.99995030   -0 03 36.9
 HV3985;SPC MD       -   460,272.00  1,285,029.34   sFT  0.99995030   -0 03 36.9
 HV3985;SPC VA N     - 2,141,212.620 3,621,734.790   MT  0.99996327   +0 52 34.6
 HV3985;SPC VA N     - 7,024,961.74 11,882,308.22   sFT  0.99996327   +0 52 34.6
 HV3985;UTM  18      - 4,311,148.577   318,319.129   MT  1.00000646   -1 19 02.7
 HV3985
 HV3985!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV3985!SPC MD       -   0.99998716  x   0.99995030  =   0.99993746
 HV3985!SPC VA N     -   0.99998716  x   0.99996327  =   0.99995043
 HV3985!UTM  18      -   0.99998716  x   1.00000646  =   0.99999362
 HV3985
 HV3985:                Primary Azimuth Mark                     Grid Az
 HV3985:SPC MD       -  UP                                       161 50 19.3
 HV3985:SPC VA N     -  UP                                       160 54 07.8
 HV3985:UTM  18      -  UP                                       163 05 45.1
 HV3985
 HV3985_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1831911148(NAD 83)
 HV3985
 HV3985|---------------------------------------------------------------------|
 HV3985| PID    Reference Object                     Distance      Geod. Az  |
 HV3985|                                                           dddmmss.s |
 HV3985| DC6667 BATTERY RM 1                         26.609 METERS 03305     |
 HV3985| HV4376 UP                                  APPROX. 2.1 KM 1614642.4 |
 HV3985|---------------------------------------------------------------------|
 HV3985
 HV3985                          SUPERSEDED SURVEY CONTROL
 HV3985
 HV3985  NAD 83(1991)-  38 55 49.66126(N)    077 05 45.53603(W) AD(       ) 2
 HV3985  NAD 83(1986)-  38 55 49.66102(N)    077 05 45.54587(W) AD(       ) 2
 HV3985  NAD 27      -  38 55 49.26200(N)    077 05 46.61700(W) AD(       ) 2
 HV3985
 HV3985.Superseded values are not recommended for survey control.
 HV3985
 HV3985.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV3985.See file dsdata.pdf to determine how the superseded data were derived.
 HV3985
 HV3985_MARKER: DS = TRIANGULATION STATION DISK
 HV3985_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV3985
 HV3985  HISTORY     - Date     Condition        Report By
 HV3985  HISTORY     - 1935     MONUMENTED       CGS
 HV3985  HISTORY     - 1938     GOOD             CGS
 HV3985  HISTORY     - 1971     GOOD             NGS
 HV3985
 HV3985                          STATION DESCRIPTION
 HV3985
 HV3985'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV3985'STATION IS ON THE OLD BREASTWORKS ALONG THE CHAIN BRIDGE ROAD
 HV3985'BETWEEN CONDUIT ROAD AND MC COMB STREET, ABOUT 15 METERS SE OF
 HV3985'THE CENTER LINE OF THE ROAD, 13 METERS SE OF POWER LINE POLE NO.
 HV3985'P.E.P. 25081, 9 METERS E OF A LARGE OAK TREE AND 3-1/2 METERS
 HV3985'SW OF A 30-INCH TREE.  THE MARK PROJECTS ABOUT 3 INCHES ABOVE
 HV3985'GROUND.
 HV3985'
 HV3985'SURFACE, UNDERGROUND AND REFERENCE MARKS ARE STANDARD BRONZE
 HV3985'DISKS SET IN CONCRETE.
 HV3985'
 HV3985'REFERENCE MARK NO. 1 IS NE OF THE STATION.  IT IS 107.55 FEET
 HV3985'SLOPE DISTANCE NNE OF THE OLD MARK.
 HV3985'
 HV3985'AN OLD MARK WAS RECOVERED CONSISTING OF A DRILL HOLE IN THE CENTER
 HV3985'OF A 6- BY 6-INCH CONCRETE POST PROJECTING ABOUT 1 INCH ABOVE
 HV3985'THE GROUND.  THIS MARK WAS CONNECTED BY TRAVERSE TO BATTERY.
 HV3985'
 HV3985'A 100-FOOT TOWER USED.
 HV3985'
 HV3985'THIS CHECKS STATION KEMBLE, 1800.  NO AZIMUTH MARK SET.
 HV3985
 HV3985                          STATION RECOVERY (1938)
 HV3985
 HV3985'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV3985'STATION MARK AND OLD MARK (KEMBLE, 1880) WERE RECOVERED.
 HV3985'REFERENCE MARK NOT SEARCHED FOR.
 HV3985
 HV3985                          STATION RECOVERY (1971)
 HV3985
 HV3985'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV3985'THE STATION, REFERENCE MARK NO. 1 AND REFERENCE MARK NO. 2,
 HV3985'(KEMBLE 1880) WERE ALL RECOVERED IN GOOD CONDITION AND THE
 HV3985'DESCRIPTION TO STATION IS ADEQUATE.  IT IS ON THE TOP OF A MOUND,
 HV3985'THE HIGHEST GROUND IN VICINITY, AND THE MARK PROJECTS 8 INCHES.
 HV3985'REFERENCE MARK NO. 1 PROJECTS 4 INCHES AND IS IN OPEN PARK AREA
 HV3985'SEVERAL FEET BELOW STATION ELEVATION.
 HV3985'
 HV3985'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN-- IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4644 ***********************************************************************
 HV4644  DESIGNATION -  BELL
 HV4644  PID         -  HV4644
 HV4644  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4644  COUNTRY     -  US
 HV4644  USGS QUAD   -  ALEXANDRIA (2019)
 HV4644
 HV4644                         *CURRENT SURVEY CONTROL
 HV4644  ______________________________________________________________________
 HV4644* NAD 83(1993) POSITION- 38 49 36.04309(N) 077 01 42.56163(W)   ADJUSTED
 HV4644* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV4644  ______________________________________________________________________
 HV4644  GEOID HEIGHT    -        -32.205 (meters)                     GEOID18
 HV4644  LAPLACE CORR    -         -2.78  (seconds)                    DEFLEC18
 HV4644  HORZ ORDER      -  SECOND
 HV4644
 HV4644.The horizontal coordinates were established by classical geodetic methods
 HV4644.and adjusted by the National Geodetic Survey in November 1994.
 HV4644
 HV4644.The orthometric height was scaled from a topographic map.
 HV4644
 HV4644.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4644.GEOID18 height accuracy estimate available here.
 HV4644
 HV4644.Click photographs - Photos may exist for this station.
 HV4644
 HV4644.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4644
 HV4644. The following values were computed from the NAD 83(1993) position.
 HV4644
 HV4644;                    North         East     Units Scale Factor Converg.
 HV4644;SPC MD       -   128,766.479   397,526.184   MT  0.99995021   -0 01 04.4
 HV4644;SPC MD       -   422,461.36  1,304,217.16   sFT  0.99995021   -0 01 04.4
 HV4644;SPC VA N     - 2,129,784.930 3,627,770.864   MT  0.99995503   +0 55 06.2
 HV4644;SPC VA N     - 6,987,469.39 11,902,111.58   sFT  0.99995503   +0 55 06.2
 HV4644;UTM  18      - 4,299,497.960   323,913.875   MT  0.99998182   -1 16 19.6
 HV4644
 HV4644!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4644!SPC MD       -   1.00000494  x   0.99995021  =   0.99995515
 HV4644!SPC VA N     -   1.00000494  x   0.99995503  =   0.99995997
 HV4644!UTM  18      -   1.00000494  x   0.99998182  =   0.99998676
 HV4644
 HV4644:                Primary Azimuth Mark                     Grid Az
 HV4644:SPC MD       -  WATER                                    285 05 45.0
 HV4644:SPC VA N     -  WATER                                    284 09 34.4
 HV4644:UTM  18      -  WATER                                    286 21 00.2
 HV4644
 HV4644_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2391399497(NAD 83)
 HV4644
 HV4644|---------------------------------------------------------------------|
 HV4644| PID    Reference Object                     Distance      Geod. Az  |
 HV4644|                                                           dddmmss.s |
 HV4644| HV4652 C1                                  APPROX. 0.6 KM 0284408.0 |
 HV4644| HV4657 MAGAZINE                            196.149 METERS 10040     |
 HV4644| HV4629 WATER                               APPROX. 0.9 KM 2850440.6 |
 HV4644| DC6668 BELL RM                               3.147 METERS 34040     |
 HV4644|---------------------------------------------------------------------|
 HV4644
 HV4644                          SUPERSEDED SURVEY CONTROL
 HV4644
 HV4644  NAD 83(1991)-  38 49 36.04145(N)    077 01 42.56302(W) AD(       ) 2
 HV4644  NAD 83(1986)-  38 49 36.04138(N)    077 01 42.57441(W) AD(       ) 2
 HV4644  NAD 27      -  38 49 35.63600(N)    077 01 43.65400(W) AD(       ) 2
 HV4644  USSD        -  38 49 35.97700(N)    077 01 43.48400(W) AD(       ) 3
 HV4644
 HV4644.Superseded values are not recommended for survey control.
 HV4644
 HV4644.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4644.See file dsdata.pdf to determine how the superseded data were derived.
 HV4644
 HV4644_MARKER: B = BOLT
 HV4644_SETTING: 0 = UNSPECIFIED SETTING
 HV4644
 HV4644  HISTORY     - Date     Condition        Report By
 HV4644  HISTORY     - 1922     MONUMENTED       CGS
 HV4644  HISTORY     - 1928     SEE DESCRIPTION  CGS
 HV4644  HISTORY     - 1929     GOOD             CGS
 HV4644  HISTORY     - 1932     GOOD             CGS
 HV4644  HISTORY     - 1938     MARK NOT FOUND   CGS
 HV4644  HISTORY     - 19950619 MARK NOT FOUND   USPSQD
 HV4644
 HV4644                          STATION DESCRIPTION
 HV4644
 HV4644'DESCRIBED BY COAST AND GEODETIC SURVEY 1922 (HPO)
 HV4644'STATION IS ON THE SW CORNER OF THE WHARF AT THE BELLEVUE
 HV4644'MAGAZINE.  IT IS MARKED BY A DEEP CROSS-MARK, 3 INCHES LONG,
 HV4644'FILED ON THE NE BOLT OF A LARGE (2- BY 3-FOOT) STEEL MOORING
 HV4644'BLOCK.  THIS MOORING BLOCK IS THE MOST WESTERLY ONE OF THE S
 HV4644'SIDE OF THE WHARF.  THE STATION IS 2 METERS S OF THE STEEL
 HV4644'DERRICK AT THE END OF THIS WHARF.
 HV4644'
 HV4644'THE REFERENCE MARK CONSISTS OF A 6-INCH ARROW CHISELED IN THE
 HV4644'SE CORNER OF THE CONCRETE FOUNDATION OF THE DERRICK.
 HV4644
 HV4644                          STATION RECOVERY (1928)
 HV4644
 HV4644'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1928 (SAB)
 HV4644'STATION RECOVERED AS DESCRIBED, BUT HEAD OF BOLT HAS BEEN
 HV4644'HAMMERED SO THAT ABOUT HALF OF CROSS IS OBSCURED.  WAS NOT
 HV4644'ABLE TO DISTINGUISH REFERENCE MARK ON CONCRETE PIER STEEL
 HV4644'DERRICK.
 HV4644
 HV4644                          STATION RECOVERY (1929)
 HV4644
 HV4644'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1929 (FLP)
 HV4644'STATION RECOVERED AS DESCRIBED.  THE DESCRIPTION IS ADEQUATE.
 HV4644
 HV4644                          STATION RECOVERY (1932)
 HV4644
 HV4644'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1932 (JPL)
 HV4644'STATION WAS FOUND AS DESCRIBED BY H.P. ODESSEY IN 1922 AND AS
 HV4644'RECOVERED BY S.A. BUCKINGHAM IN 1928.
 HV4644
 HV4644                          STATION RECOVERY (1938)
 HV4644
 HV4644'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4644'STATION AND REFERENCE MARK COULD NOT BE FOUND AFTER A HALF
 HV4644'HOUR SEARCH.  IT IS BELIEVED THAT EXACT POSITION OF BOTH
 HV4644'MARKS IS LOST AND ONLY AN APPROXIMATE POSITION CAN BE RECOVERED
 HV4644'FROM THE STEEL DERRICK WHICH STILL REMAINS.
 HV4644
 HV4644                          STATION RECOVERY (1995)
 HV4644
 HV4644'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4644'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV0871 ***********************************************************************
 HV0871  DESIGNATION -  BEN 35 NCTA
 HV0871  PID         -  HV0871
 HV0871  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV0871  COUNTRY     -  US
 HV0871  USGS QUAD   -  WASHINGTON EAST (2016)
 HV0871
 HV0871                         *CURRENT SURVEY CONTROL
 HV0871  ______________________________________________________________________
 HV0871* NAD 83(1986) POSITION- 38 52 57.     (N) 076 59 29.     (W)   SCALED
 HV0871* NAVD 88 ORTHO HEIGHT -    22.519 (meters)       73.88  (feet) ADJUSTED
 HV0871  ______________________________________________________________________
 HV0871  GEOID HEIGHT    -        -32.173 (meters)                     GEOID18
 HV0871  DYNAMIC HEIGHT  -         22.507 (meters)       73.84  (feet) COMP
 HV0871  MODELED GRAVITY -    980,098.1   (mgal)                       NAVD 88
 HV0871
 HV0871  VERT ORDER      -  FIRST     CLASS I
 HV0871
 HV0871.The horizontal coordinates were scaled from a map and have
 HV0871.an estimated accuracy of +/- 6 seconds.
 HV0871
 HV0871.The orthometric height was determined by differential leveling and
 HV0871.adjusted by the NATIONAL GEODETIC SURVEY
 HV0871.in June 1991.
 HV0871
 HV0871.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV0871.GEOID18 height accuracy estimate available here.
 HV0871
 HV0871.Click photographs - Photos may exist for this station.
 HV0871
 HV0871.The dynamic height is computed by dividing the NAVD 88
 HV0871.geopotential number by the normal gravity value computed on the
 HV0871.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV0871.degrees latitude (g = 980.6199 gals.).
 HV0871
 HV0871.The modeled gravity was interpolated from observed gravity values.
 HV0871
 HV0871
 HV0871_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ272056(NAD 83)
 HV0871
 HV0871                          SUPERSEDED SURVEY CONTROL
 HV0871
 HV0871  NGVD 29 (11/26/84)   22.757  (m)           74.66   (f) ADJUSTED    1 1
 HV0871
 HV0871.Superseded values are not recommended for survey control.
 HV0871
 HV0871.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV0871.See file dsdata.pdf to determine how the superseded data were derived.
 HV0871
 HV0871_STAMPING: BEN 35
 HV0871
 HV0871  HISTORY     - Date     Condition        Report By
 HV0871  HISTORY     - UNK      MONUMENTED       LOCENG
 HV0871  HISTORY     - 1971     GOOD             NGS
 HV0871  HISTORY     - 20200113 MARK NOT FOUND   ARCSHE
 HV0871
 HV0871                          STATION DESCRIPTION
 HV0871
 HV0871'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV0871'AT WASHINGTON.
 HV0871'AT WASHINGTON, D.C., ABOUT 0.7 MILE SOUTHEAST ALONG PENNSYLVANIA
 HV0871'AVENUE FROM THE JUNCTION OF INDEPENDENCE AVENUE, AT THE JUNCTION
 HV0871'OF THE AVENUE AND SE E AND SE 11 STREETS, SET IN THE TOP OF THE
 HV0871'CONCRETE SIDEWALK, 15.1 FEET SOUTH OF THE SOUTH CURB OF SE E
 HV0871'STREET, 30.1 FEET NORTHWEST OF THE NORTHWEST CURB OF SE 11 STREET,
 HV0871'AND ABOUT 1/2 FOOT ABOVE THE LEVEL OF THE STREETS.
 HV0871
 HV0871                          STATION RECOVERY (2020)
 HV0871
 HV0871'RECOVERY NOTE BY ARCHER-SHEE LAND SURVEYING 2020 (MRA)
 HV0871'NEW BRICK SIDEWALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1231 ***********************************************************************
 HV1231  DESIGNATION -  BENNING
 HV1231  PID         -  HV1231
 HV1231  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1231  COUNTRY     -  US
 HV1231  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1231
 HV1231                         *CURRENT SURVEY CONTROL
 HV1231  ______________________________________________________________________
 HV1231* NAD 83(1986) POSITION- 38 53 45.     (N) 076 57 10.     (W)   SCALED
 HV1231* NAVD 88 ORTHO HEIGHT -    10.808 (meters)       35.46  (feet) ADJUSTED
 HV1231  ______________________________________________________________________
 HV1231  GEOID HEIGHT    -        -32.227 (meters)                     GEOID18
 HV1231  DYNAMIC HEIGHT  -         10.802 (meters)       35.44  (feet) COMP
 HV1231  MODELED GRAVITY -    980,093.2   (mgal)                       NAVD 88
 HV1231
 HV1231  VERT ORDER      -  FIRST     CLASS II
 HV1231
 HV1231.The horizontal coordinates were scaled from a map and have
 HV1231.an estimated accuracy of +/- 6 seconds.
 HV1231
 HV1231.The orthometric height was determined by differential leveling and
 HV1231.adjusted by the NATIONAL GEODETIC SURVEY
 HV1231.in June 1991.
 HV1231
 HV1231.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1231.GEOID18 height accuracy estimate available here.
 HV1231
 HV1231.Click photographs - Photos may exist for this station.
 HV1231
 HV1231.The dynamic height is computed by dividing the NAVD 88
 HV1231.geopotential number by the normal gravity value computed on the
 HV1231.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1231.degrees latitude (g = 980.6199 gals.).
 HV1231
 HV1231.The modeled gravity was interpolated from observed gravity values.
 HV1231
 HV1231
 HV1231_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ306070(NAD 83)
 HV1231
 HV1231                          SUPERSEDED SURVEY CONTROL
 HV1231
 HV1231  NGVD 29 (11/26/84)   11.044  (m)           36.23   (f) ADJUSTED    1 2
 HV1231
 HV1231.Superseded values are not recommended for survey control.
 HV1231
 HV1231.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1231.See file dsdata.pdf to determine how the superseded data were derived.
 HV1231
 HV1231_MARKER: Z = SEE DESCRIPTION
 HV1231_SETTING: 45 = UNSPECIFIED DEEP UNSLEEVED SETTING (10 FT.+)
 HV1231_SP_SET: UNSPECIFIED DEEP SET
 HV1231_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1231+STABILITY: SURFACE MOTION
 HV1231
 HV1231  HISTORY     - Date     Condition        Report By
 HV1231  HISTORY     - UNK      MONUMENTED       DCDHT
 HV1231  HISTORY     - 1929     GOOD             CGS
 HV1231
 HV1231                          STATION DESCRIPTION
 HV1231
 HV1231'DESCRIBED BY COAST AND GEODETIC SURVEY 1929
 HV1231'AT WASHINGTON.
 HV1231'AT WASHINGTON, ON BENNING ROAD NORTHEAST, AT THE INTERSECTION OF
 HV1231'KENILWORTH AVENUE NORTHEAST, AT THE WESTBOUND VIADUCT, 5 FEET
 HV1231'NORTH OF THE NORTH FACE OF THE WEST ABUTMENT, 32 FEET WEST OF
 HV1231'THE NORTHEAST CORNER, 5 FEET NORTH OF BENCH MARK J 2 RESET
 HV1231'DESCRIBED ABOUT, AND LEVEL WITH THE GROUND.  A DISTRICT OF
 HV1231'COLUMBIA HIGHWAY DEPARTMENT SPECIAL DEEP MARK UNDER A 10-INCH
 HV1231'COVER MARKED WATER METER.  NOTE-- ACCESS TO THIS MARK IS OBTAINED
 HV1231'BY PREARRANGEMENT WITH ENGINEERS OF THE DISTRICT OF COLUMBIA
 HV1231'HIGHWAY DEPARTMENT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1232 ***********************************************************************
 HV1232  DESIGNATION -  BENNING RESET
 HV1232  PID         -  HV1232
 HV1232  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1232  COUNTRY     -  US
 HV1232  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1232
 HV1232                         *CURRENT SURVEY CONTROL
 HV1232  ______________________________________________________________________
 HV1232* NAD 83(1986) POSITION- 38 53 45.     (N) 076 57 10.     (W)   SCALED
 HV1232* NAVD 88 ORTHO HEIGHT -    11.749 (meters)       38.55  (feet) ADJUSTED
 HV1232  ______________________________________________________________________
 HV1232  GEOID HEIGHT    -        -32.227 (meters)                     GEOID18
 HV1232  DYNAMIC HEIGHT  -         11.743 (meters)       38.53  (feet) COMP
 HV1232  MODELED GRAVITY -    980,093.2   (mgal)                       NAVD 88
 HV1232
 HV1232  VERT ORDER      -  FIRST     CLASS II
 HV1232
 HV1232.The horizontal coordinates were scaled from a map and have
 HV1232.an estimated accuracy of +/- 6 seconds.
 HV1232
 HV1232.The orthometric height was determined by differential leveling and
 HV1232.adjusted by the NATIONAL GEODETIC SURVEY
 HV1232.in June 1991.
 HV1232
 HV1232.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1232.GEOID18 height accuracy estimate available here.
 HV1232
 HV1232.Click photographs - Photos may exist for this station.
 HV1232
 HV1232.The dynamic height is computed by dividing the NAVD 88
 HV1232.geopotential number by the normal gravity value computed on the
 HV1232.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1232.degrees latitude (g = 980.6199 gals.).
 HV1232
 HV1232.The modeled gravity was interpolated from observed gravity values.
 HV1232
 HV1232
 HV1232_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ306070(NAD 83)
 HV1232
 HV1232                          SUPERSEDED SURVEY CONTROL
 HV1232
 HV1232  NGVD 29 (11/26/84)   11.983  (m)           39.31   (f) ADJUSTED    1 2
 HV1232
 HV1232.Superseded values are not recommended for survey control.
 HV1232
 HV1232.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1232.See file dsdata.pdf to determine how the superseded data were derived.
 HV1232
 HV1232_MARKER: Z = SEE DESCRIPTION
 HV1232_SETTING: 45 = UNSPECIFIED DEEP UNSLEEVED SETTING (10 FT.+)
 HV1232_SP_SET: UNSPECIFIED DEEP SET
 HV1232_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1232+STABILITY: SURFACE MOTION
 HV1232
 HV1232  HISTORY     - Date     Condition        Report By
 HV1232  HISTORY     - 1956     MONUMENTED       DCDHT
 HV1232
 HV1232                          STATION DESCRIPTION
 HV1232
 HV1232'DESCRIBED BY DC DEPARTMENT OF HIGHWAYS AND TRAFFIC 1956
 HV1232'AT WASHINGTON.
 HV1232'AT THE INTERSECTION OF BENNING ST. AND KENILWORTH AVE. N.E.,
 HV1232'AT THE WEST BOUND VIADUCT.  THIRTY-TWO FT. W. OF THE N.E.
 HV1232'CORNER AND 5 FT. N. OF THE N. FACE OF THE W. ABUTMENT AND ABOUT
 HV1232'LEVEL WITH THE GROUND. (NOTE, MARK IS 5 FT. NORTH OF J 2 RESET
 HV1232'1954).  A SPECIAL DEEP MARK UNDER A 10-INCH COVER MARKED WATER
 HV1232'METER.  ACCESS TO IT IS OBTAINED BY PREARRANGEMENT WITH
 HV1232'ENGINEERS OF THE D.C.H.D.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV3998 ***********************************************************************
 HV3998  DESIGNATION -  BENTON
 HV3998  PID         -  HV3998
 HV3998  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV3998  COUNTRY     -  US
 HV3998  USGS QUAD   -  WASHINGTON WEST (2016)
 HV3998
 HV3998                         *CURRENT SURVEY CONTROL
 HV3998  ______________________________________________________________________
 HV3998* NAD 83(1993) POSITION- 38 54 58.48160(N) 077 05 53.54715(W)   ADJUSTED
 HV3998* NAVD 88 ORTHO HEIGHT -    40.    (meters)      131.    (feet) SCALED
 HV3998  ______________________________________________________________________
 HV3998  GEOID HEIGHT    -        -31.958 (meters)                     GEOID18
 HV3998  LAPLACE CORR    -         -2.34  (seconds)                    DEFLEC18
 HV3998  HORZ ORDER      -  SECOND
 HV3998
 HV3998.The horizontal coordinates were established by classical geodetic methods
 HV3998.and adjusted by the National Geodetic Survey in November 1994.
 HV3998
 HV3998.The orthometric height was scaled from a topographic map.
 HV3998
 HV3998.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV3998.GEOID18 height accuracy estimate available here.
 HV3998
 HV3998.Click photographs - Photos may exist for this station.
 HV3998
 HV3998.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV3998
 HV3998. The following values were computed from the NAD 83(1993) position.
 HV3998
 HV3998;                    North         East     Units Scale Factor Converg.
 HV3998;SPC MD       -   138,713.198   391,483.040   MT  0.99995010   -0 03 41.9
 HV3998;SPC MD       -   455,094.88  1,284,390.61   sFT  0.99995010   -0 03 41.9
 HV3998;SPC VA N     - 2,139,631.642 3,621,565.921   MT  0.99996194   +0 52 29.6
 HV3998;SPC VA N     - 7,019,774.81 11,881,754.19   sFT  0.99996194   +0 52 29.6
 HV3998;UTM  18      - 4,309,575.151   318,089.862   MT  1.00000749   -1 19 06.3
 HV3998
 HV3998!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV3998!SPC MD       -   0.99999877  x   0.99995010  =   0.99994887
 HV3998!SPC VA N     -   0.99999877  x   0.99996194  =   0.99996071
 HV3998!UTM  18      -   0.99999877  x   1.00000749  =   1.00000626
 HV3998
 HV3998:                Primary Azimuth Mark                     Grid Az
 HV3998:SPC MD       -  UP                                       117 58 09.1
 HV3998:SPC VA N     -  UP                                       117 01 57.6
 HV3998:UTM  18      -  UP                                       119 13 33.5
 HV3998
 HV3998_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1808909575(NAD 83)
 HV3998
 HV3998|---------------------------------------------------------------------|
 HV3998| PID    Reference Object                     Distance      Geod. Az  |
 HV3998|                                                           dddmmss.s |
 HV3998| HV4376 UP                                  APPROX. 1.0 KM 1175427.2 |
 HV3998| HV3866 ROCK 2                              APPROX. 0.6 KM 2010359.3 |
 HV3998| DC6678 BENTON RM 1                          16.395 METERS 32021     |
 HV3998|---------------------------------------------------------------------|
 HV3998
 HV3998                          SUPERSEDED SURVEY CONTROL
 HV3998
 HV3998  NAD 83(1991)-  38 54 58.48043(N)    077 05 53.54877(W) AD(       ) 2
 HV3998  NAD 83(1986)-  38 54 58.48020(N)    077 05 53.55870(W) AD(       ) 2
 HV3998  NAD 27      -  38 54 58.08000(N)    077 05 54.62900(W) AD(       ) 2
 HV3998
 HV3998.Superseded values are not recommended for survey control.
 HV3998
 HV3998.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV3998.See file dsdata.pdf to determine how the superseded data were derived.
 HV3998
 HV3998_MARKER: DS = TRIANGULATION STATION DISK
 HV3998_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV3998_STAMPING: BENTON 1935
 HV3998_MARK LOGO: CGS
 HV3998_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV3998+STABILITY: SURFACE MOTION
 HV3998
 HV3998  HISTORY     - Date     Condition        Report By
 HV3998  HISTORY     - 1935     MONUMENTED       CGS
 HV3998  HISTORY     - 1938     GOOD             CGS
 HV3998  HISTORY     - 1946     GOOD             CGS
 HV3998  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV3998
 HV3998                          STATION DESCRIPTION
 HV3998
 HV3998'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV3998'THE STATION IS IN A SMALL ORCHARD IN FRONT OF THE HOME OF DR.
 HV3998'FREDERICK BENTON, RESERVOIR ROAD.
 HV3998'
 HV3998'SURFACE, UNDERGROUND AND REFERENCE MARKS ARE STANDARD BRONZE DISKS
 HV3998'SET IN CONCRETE.
 HV3998'
 HV3998'THE REFERENCE MARK IS N OF THE STATION, 2 METERS S OF THE TOP
 HV3998'OF A TERRACE SLOPE AND 2 METERS SE OF A 24-INCH TREE.
 HV3998'
 HV3998'REACHED FROM THE INTERSECTION OF RESERVOIR ROAD AND CONDUIT ROAD
 HV3998'BY GOING NW ON RESERVOIR ROAD 0.15 MILE TO THE DRIVE LEADING
 HV3998'LEFT TO DR. BENTONS HOUSE.  TURN LEFT HERE AND GO STRAIGHT UPHILL,
 HV3998'TO THE LEFT OF THE DRIVE, TO THE TOP OF THE HILL.  THE STATION IS
 HV3998'HERE ABOUT 50 METERS W OF RESERVOIR ROAD AND 75 METERS S OF THE
 HV3998'HOUSE, 3.9 METERS W OF A 14-INCH MAPLE TREE.  THE MARK PROJECTS
 HV3998'2 INCHES ABOVE GROUND.
 HV3998'
 HV3998'NO OTHER MARKS ESTABLISHED.  NO OBJECTS VG.
 HV3998
 HV3998                          STATION RECOVERY (1938)
 HV3998
 HV3998'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV3998'STATION AND REFERENCE MARKS RECOVERED.
 HV3998
 HV3998                          STATION RECOVERY (1946)
 HV3998
 HV3998'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV3998'STATION AND REFERENCE MARKS RECOVERED AS DESCRIBED.  MARKS ARE
 HV3998'IN GOOD CONDITION.
 HV3998
 HV3998                          STATION RECOVERY (1971)
 HV3998
 HV3998'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV3998'STATION IS LOST.  THE HILL ON WHICH IT WAS LOCATED HAS BEEN
 HV3998'GRADED OFF AND STATION SITE DESTROYED.  REFERENCE MARK NO. 1 WAS
 HV3998'RECOVERED BUT NOT IN POSITION IT WAS ORIGINALLY SET, IT HAS BEEN
 HV3998'MOVED AND THE ARROW IS POINTING IN A DIFFERENT DIRECTION THAN
 HV3998'WHERE THE STATION WAS LOCATED.
 HV3998'
 HV3998'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN-- IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4100 ***********************************************************************
 HV4100  DESIGNATION -  BLUFF
 HV4100  PID         -  HV4100
 HV4100  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4100  COUNTRY     -  US
 HV4100  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4100
 HV4100                         *CURRENT SURVEY CONTROL
 HV4100  ______________________________________________________________________
 HV4100* NAD 83(1993) POSITION- 38 55 44.82512(N) 077 06 37.03532(W)   ADJUSTED
 HV4100* NAVD 88 ORTHO HEIGHT -    35.    (meters)      115.    (feet) SCALED
 HV4100  ______________________________________________________________________
 HV4100  GEOID HEIGHT    -        -31.926 (meters)                     GEOID18
 HV4100  LAPLACE CORR    -         -2.00  (seconds)                    DEFLEC18
 HV4100  HORZ ORDER      -  SECOND
 HV4100
 HV4100.The horizontal coordinates were established by classical geodetic methods
 HV4100.and adjusted by the National Geodetic Survey in November 1994.
 HV4100
 HV4100.The orthometric height was scaled from a topographic map.
 HV4100
 HV4100.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4100.GEOID18 height accuracy estimate available here.
 HV4100
 HV4100.Click photographs - Photos may exist for this station.
 HV4100
 HV4100.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4100
 HV4100. The following values were computed from the NAD 83(1993) position.
 HV4100
 HV4100;                    North         East     Units Scale Factor Converg.
 HV4100;SPC MD       -   140,143.428   390,437.136   MT  0.99995028   -0 04 09.2
 HV4100;SPC MD       -   459,787.23  1,280,959.17   sFT  0.99995028   -0 04 09.2
 HV4100;SPC VA N     - 2,141,044.603 3,620,496.766   MT  0.99996314   +0 52 02.4
 HV4100;SPC VA N     - 7,024,410.50 11,878,246.47   sFT  0.99996314   +0 52 02.4
 HV4100;UTM  18      - 4,311,028.066   317,075.523   MT  1.00001205   -1 19 35.0
 HV4100
 HV4100!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4100!SPC MD       -   0.99999955  x   0.99995028  =   0.99994983
 HV4100!SPC VA N     -   0.99999955  x   0.99996314  =   0.99996269
 HV4100!UTM  18      -   0.99999955  x   1.00001205  =   1.00001160
 HV4100
 HV4100:                Primary Azimuth Mark                     Grid Az
 HV4100:SPC MD       -  CREEK                                    206 52 31.0
 HV4100:SPC VA N     -  CREEK                                    205 56 19.4
 HV4100:UTM  18      -  CREEK                                    208 07 56.8
 HV4100
 HV4100_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1707511028(NAD 83)
 HV4100
 HV4100|---------------------------------------------------------------------|
 HV4100| PID    Reference Object                     Distance      Geod. Az  |
 HV4100|                                                           dddmmss.s |
 HV4100| DC6699 BLUFF RM 1                           26.222 METERS 01459     |
 HV4100| DC6700 BLUFF RM 2                           20.306 METERS 07857     |
 HV4100| DC6701 BLUFF WM 1                           21.245 METERS 09804     |
 HV4100| HV1825 GALENA                              261.865 METERS 14848     |
 HV4100| HV0556 DRILL                               APPROX. 0.6 KM 1853912.0 |
 HV4100| HV0366 CREEK                               APPROX. 0.5 KM 2064821.8 |
 HV4100| HV0746 HOLE                                455.107 METERS 2364509.2 |
 HV4100|---------------------------------------------------------------------|
 HV4100
 HV4100                          SUPERSEDED SURVEY CONTROL
 HV4100
 HV4100  NAD 83(1991)-  38 55 44.82406(N)    077 06 37.03697(W) AD(       ) 2
 HV4100  NAD 83(1986)-  38 55 44.82382(N)    077 06 37.04697(W) AD(       ) 2
 HV4100  NAD 27      -  38 55 44.42400(N)    077 06 38.11900(W) AD(       ) 2
 HV4100
 HV4100.Superseded values are not recommended for survey control.
 HV4100
 HV4100.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4100.See file dsdata.pdf to determine how the superseded data were derived.
 HV4100
 HV4100_MARKER: DD = SURVEY DISK
 HV4100_SETTING: 21 = SET IN CONCRETE IN A CLAY TILE PIPE
 HV4100_MARK LOGO: USACE
 HV4100_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4100
 HV4100  HISTORY     - Date     Condition        Report By
 HV4100  HISTORY     - 1925     MONUMENTED       USACE
 HV4100  HISTORY     - 1935     MARK NOT FOUND   CGS
 HV4100  HISTORY     - 19950619 MARK NOT FOUND   USPSQD
 HV4100
 HV4100                          STATION DESCRIPTION
 HV4100
 HV4100'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1925 (GLB)
 HV4100'STATION IS SITUATED OPPOSITE NO. 5221 ON THE STREET FOLLOWING
 HV4100'ALONG THE TOP OF THE BLUFF ABOVE CHAIN BRIDGE.  ABOUT 225 METERS SE
 HV4100'OF THE E END OF THE BRIDGE AND ABOUT 50 FEET W OF THE STREET.
 HV4100'ABOUT 12 FEET FROM THE EDGE OF THE BLUFF OVER THE RAILROAD CUT,
 HV4100'AND ABOUT MIDWAY BETWEEN TWO FIRE HYDRANTS, ABOUT 60 METERS
 HV4100'EITHER WAY.
 HV4100'
 HV4100'STATION IS MARKED BY A U.S. ENGINEERS MARK SET IN A 12-INCH
 HV4100'TILE FILLED WITH CONCRETE SET BIG END DOWN AND PROJECTING FROM
 HV4100'THE GROUND ABOUT 3 INCHES.
 HV4100'
 HV4100'REFERENCE MARK NO. 1 IS THE CENTER OF THE IRON COVER OF A SEWER
 HV4100'MANHOLE.
 HV4100'
 HV4100'REFERENCE MARK NO. 2 IS THE CENTER OF THE IRON COVER OF A WATER
 HV4100'METER.
 HV4100'
 HV4100'WITNESS MARK NO. 1 IS A P.E.P. TELEPHONE POLE NO. 2447.
 HV4100
 HV4100                          STATION RECOVERY (1935)
 HV4100
 HV4100'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4100'STATION WAS SEARCHED FOR BUT NOT RECOVERED.  THE STREET HERE HAS
 HV4100'BEEN GRADED SINCE THE MARK WAS SET, SO THE MARK IS EVIDENTLY
 HV4100'COVERED OR HAS BEEN REMOVED.  A NEW STATION BLUFF 2, WAS
 HV4100'ESTABLISHED IN THE VICINITY.
 HV4100
 HV4100                          STATION RECOVERY (1995)
 HV4100
 HV4100'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4100'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4102 ***********************************************************************
 HV4102  DESIGNATION -  BLUFF 2
 HV4102  PID         -  HV4102
 HV4102  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4102  COUNTRY     -  US
 HV4102  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4102
 HV4102                         *CURRENT SURVEY CONTROL
 HV4102  ______________________________________________________________________
 HV4102* NAD 83(1993) POSITION- 38 55 45.29429(N) 077 06 37.27009(W)   ADJUSTED
 HV4102* NAVD 88 ORTHO HEIGHT -    35.    (meters)      115.    (feet) SCALED
 HV4102  ______________________________________________________________________
 HV4102  GEOID HEIGHT    -        -31.926 (meters)                     GEOID18
 HV4102  LAPLACE CORR    -         -1.99  (seconds)                    DEFLEC18
 HV4102  HORZ ORDER      -  SECOND
 HV4102
 HV4102.The horizontal coordinates were established by classical geodetic methods
 HV4102.and adjusted by the National Geodetic Survey in November 1994.
 HV4102
 HV4102.The orthometric height was scaled from a topographic map.
 HV4102
 HV4102.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4102.GEOID18 height accuracy estimate available here.
 HV4102
 HV4102.Click photographs - Photos may exist for this station.
 HV4102
 HV4102.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4102
 HV4102. The following values were computed from the NAD 83(1993) position.
 HV4102
 HV4102;                    North         East     Units Scale Factor Converg.
 HV4102;SPC MD       -   140,157.902   390,431.499   MT  0.99995028   -0 04 09.3
 HV4102;SPC MD       -   459,834.72  1,280,940.68   sFT  0.99995028   -0 04 09.3
 HV4102;SPC VA N     - 2,141,058.983 3,620,490.893   MT  0.99996315   +0 52 02.3
 HV4102;SPC VA N     - 7,024,457.68 11,878,227.20   sFT  0.99996315   +0 52 02.3
 HV4102;UTM  18      - 4,311,042.661   317,070.205   MT  1.00001207   -1 19 35.1
 HV4102
 HV4102!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4102!SPC MD       -   0.99999955  x   0.99995028  =   0.99994983
 HV4102!SPC VA N     -   0.99999955  x   0.99996315  =   0.99996270
 HV4102!UTM  18      -   0.99999955  x   1.00001207  =   1.00001162
 HV4102
 HV4102:                Primary Azimuth Mark                     Grid Az
 HV4102:SPC MD       -  BATTERY                                  083 53 43.5
 HV4102:SPC VA N     -  BATTERY                                  082 57 31.9
 HV4102:UTM  18      -  BATTERY                                  085 09 09.3
 HV4102
 HV4102_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1707011042(NAD 83)
 HV4102
 HV4102|---------------------------------------------------------------------|
 HV4102| PID    Reference Object                     Distance      Geod. Az  |
 HV4102|                                                           dddmmss.s |
 HV4102| HV3985 BATTERY                             APPROX. 1.3 KM 0834934.2 |
 HV4102| DC6696 BLUFF 2 RM 1                         24.894 METERS 14310     |
 HV4102| HV0366 CREEK                               APPROX. 0.5 KM 2053246.3 |
 HV4102| HV0746 HOLE                                458.562 METERS 2345110.7 |
 HV4102| DC6697 BLUFF 2 RM 2                         20.772 METERS 33737     |
 HV4102|---------------------------------------------------------------------|
 HV4102
 HV4102                          SUPERSEDED SURVEY CONTROL
 HV4102
 HV4102  NAD 83(1991)-  38 55 45.29323(N)    077 06 37.27174(W) AD(       ) 2
 HV4102  NAD 83(1986)-  38 55 45.29302(N)    077 06 37.28163(W) AD(       ) 2
 HV4102  NAD 27      -  38 55 44.89300(N)    077 06 38.35200(W) AD(       ) 2
 HV4102
 HV4102.Superseded values are not recommended for survey control.
 HV4102
 HV4102.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4102.See file dsdata.pdf to determine how the superseded data were derived.
 HV4102
 HV4102_MARKER: DS = TRIANGULATION STATION DISK
 HV4102_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV4102_STAMPING: BLUFF 2 1935
 HV4102_MARK LOGO: CGS
 HV4102_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV4102+STABILITY: SURFACE MOTION
 HV4102
 HV4102  HISTORY     - Date     Condition        Report By
 HV4102  HISTORY     - 1935     MONUMENTED       CGS
 HV4102  HISTORY     - 1938     GOOD             CGS
 HV4102  HISTORY     - 1946     GOOD             CGS
 HV4102  HISTORY     - 19950619 GOOD             USPSQD
 HV4102  HISTORY     - 20050806 GOOD             GEOCAC
 HV4102
 HV4102                          STATION DESCRIPTION
 HV4102
 HV4102'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4102'STATION WAS ESTABLISHED TO REPLACE BLUFF WHICH WAS NOT RECOVERED.
 HV4102'IT IS ON THE BLUFF OVERLOOKING THE POTOMAC RIVER FROM THE DISTRICT
 HV4102'OF COLUMBIA SIDE, 7.6 METERS WSW OF THE CENTER LINE OF POTOMAC
 HV4102'AVENUE (THE STREET ABOVE CHAIN BRIDGE ROAD), OPPOSITE A POINT
 HV4102'JUST S OF HOUSE NO. 5533, WHERE A CABLE GUARD IS SET BACK, 1.5
 HV4102'METERS W OF THIS CABLE GUARD, AND 11.5 METERS SW OF TELEPHONE POLE
 HV4102'NO.  P.E.P. 220042.  THE MARK PROJECTS ABOUT 2 INCHES ABOVE THE
 HV4102'GROUND.
 HV4102'
 HV4102'SURFACE, UNDERGROUND AND REFERENCE MARKS ARE STANDARD BRONZE
 HV4102'DISKS SET IN CONCRETE.
 HV4102'
 HV4102'REFERENCE MARK NO. 1 IS SE OF THE STATION, 3 METERS W OF THE
 HV4102'CENTER LINE OF POTOMAC AVENUE AND 0.5 METER E OF THE CABLE GUARD.
 HV4102'
 HV4102'REFERENCE MARK NO. 2 IS NNW OF THE STATION IN THE GUARD RAIL
 HV4102'LINE, 6 METERS W OF THE CENTER LINE OF POTOMAC AVENUE, OPPOSITE
 HV4102'HOUSE NO. 5533, AND 8 METERS S OF RANGE WITH THE TERRACE STEPS
 HV4102'AND FRONT DOOR OF THIS HOUSE.
 HV4102'
 HV4102'A 64-FOOT TOWER WAS USED.  NO AZIMUTH MARK SET.
 HV4102
 HV4102                          STATION RECOVERY (1938)
 HV4102
 HV4102'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4102'STATION MARK RECOVERED.  REFERENCE MARKS NOT SEARCHED FOR.
 HV4102
 HV4102                          STATION RECOVERY (1946)
 HV4102
 HV4102'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4102'FIRST PARAGRAPH OF DESCRIPTION--HOUSE NO. 5533 WHERE A CABLE
 HV4102'GUARD IS SET BACK, 1.5 METERS W OF THIS CABLE GUARD SHOULD READ
 HV4102'HOUSE NO. 5529, 1.5 METERS W OF A CABLE GUARD.
 HV4102'
 HV4102'FOURTH PARAGRAPH--OPPOSITE HOUSE NO. 5533 AND 8 METERS S OF
 HV4102'RANGE WITH THE TERRACE STEPS AND FRONT DOOR OF THIS HOUSE SHOULD
 HV4102'READ BETWEEN HOUSE NO. 5529 AND HOUSE NO. 5533.  OTHERWISE, AS
 HV4102'DESCRIBED.  STATION AND REFERENCE MARKS IN GOOD CONDITION.
 HV4102
 HV4102                          STATION RECOVERY (1995)
 HV4102
 HV4102'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4102'RECOVERED IN GOOD CONDITION.
 HV4102
 HV4102                          STATION RECOVERY (2005)
 HV4102
 HV4102'RECOVERY NOTE BY GEOCACHING 2005 (APC)
 HV4102'FOUND AS DESCRIBED AND ABOUT 6.6 FEET SOUTH-SOUTHWEST OF A METAL POST
 HV4102'WITH A 'ONE LANE AHEAD' SIGN, AND ABOUT 4.7 FEET BEHIND (WEST OF) A
 HV4102'CABLE FENCE. MARK IS ACROSS POTOMAC AVENUE FROM HOUSE NUMBER 5525.
 HV4102'
 HV4102'RM 1 NOT OBSERVED BUT MAY BE IN SHRUBBERY, ETC., ACROSS STREET FROM
 HV4102'HOUSE NUMBER 5521.
 HV4102'
 HV4102'RM 2 FOUND AS DESCRIBED IN 1946 RECOVERY REPORT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2005 ***********************************************************************
 HV2005  DESIGNATION -  BOAT
 HV2005  PID         -  HV2005
 HV2005  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2005  COUNTRY     -  US
 HV2005  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2005
 HV2005                         *CURRENT SURVEY CONTROL
 HV2005  ______________________________________________________________________
 HV2005* NAD 83(1993) POSITION- 38 52 55.81722(N) 077 02 40.75117(W)   ADJUSTED
 HV2005* NAVD 88 ORTHO HEIGHT -     2.063 (meters)        6.77  (feet) ADJUSTED
 HV2005  ______________________________________________________________________
 HV2005  GEOID HEIGHT    -        -32.090 (meters)                     GEOID18
 HV2005  LAPLACE CORR    -         -2.63  (seconds)                    DEFLEC18
 HV2005  DYNAMIC HEIGHT  -          2.062 (meters)        6.77  (feet) COMP
 HV2005  MODELED GRAVITY -    980,096.3   (mgal)                       NAVD 88
 HV2005
 HV2005  HORZ ORDER      -  THIRD
 HV2005  VERT ORDER      -  FIRST     CLASS II
 HV2005
 HV2005.The horizontal coordinates were established by classical geodetic methods
 HV2005.and adjusted by the National Geodetic Survey in November 1994.
 HV2005
 HV2005.The orthometric height was determined by differential leveling and
 HV2005.adjusted by the NATIONAL GEODETIC SURVEY
 HV2005.in June 1991.
 HV2005
 HV2005.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2005.GEOID18 height accuracy estimate available here.
 HV2005
 HV2005.Click photographs - Photos may exist for this station.
 HV2005
 HV2005.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2005
 HV2005.The dynamic height is computed by dividing the NAVD 88
 HV2005.geopotential number by the normal gravity value computed on the
 HV2005.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2005.degrees latitude (g = 980.6199 gals.).
 HV2005
 HV2005.The modeled gravity was interpolated from observed gravity values.
 HV2005
 HV2005. The following values were computed from the NAD 83(1993) position.
 HV2005
 HV2005;                    North         East     Units Scale Factor Converg.
 HV2005;SPC MD       -   134,927.140   396,125.649   MT  0.99994985   -0 01 40.9
 HV2005;SPC MD       -   442,673.46  1,299,622.23   sFT  0.99994985   -0 01 40.9
 HV2005;SPC VA N     - 2,135,921.925 3,626,269.835   MT  0.99995903   +0 54 29.9
 HV2005;SPC VA N     - 7,007,603.85 11,897,186.95   sFT  0.99995903   +0 54 29.9
 HV2005;UTM  18      - 4,305,688.032   322,648.565   MT  0.99998732   -1 17 01.7
 HV2005
 HV2005!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2005!SPC MD       -   1.00000471  x   0.99994985  =   0.99995456
 HV2005!SPC VA N     -   1.00000471  x   0.99995903  =   0.99996374
 HV2005!UTM  18      -   1.00000471  x   0.99998732  =   0.99999203
 HV2005
 HV2005:                Primary Azimuth Mark                     Grid Az
 HV2005:SPC MD       -  CUP                                      235 14 52.6
 HV2005:SPC VA N     -  CUP                                      234 18 41.8
 HV2005:UTM  18      -  CUP                                      236 30 13.4
 HV2005
 HV2005_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2264805688(NAD 83)
 HV2005
 HV2005|---------------------------------------------------------------------|
 HV2005| PID    Reference Object                     Distance      Geod. Az  |
 HV2005|                                                           dddmmss.s |
 HV2005| HV4436 TIDAL USE                           248.851 METERS 13132     |
 HV2005| HV4263 CUP                                 APPROX. 0.6 KM 2351311.7 |
 HV2005| HV2006 BOAT RM 1                            13.686 METERS 23513     |
 HV2005|---------------------------------------------------------------------|
 HV2005
 HV2005                          SUPERSEDED SURVEY CONTROL
 HV2005
 HV2005  NAD 83(1991)-  38 52 55.81594(N)    077 02 40.75266(W) AD(       ) 3
 HV2005  NAD 83(1986)-  38 52 55.81566(N)    077 02 40.76332(W) AD(       ) 3
 HV2005  NAD 27      -  38 52 55.41500(N)    077 02 41.84000(W) AD(       ) 3
 HV2005  NGVD 29               2.30   (m)            7.5    (f) LEVELING    3  
 HV2005  NGVD 29 (11/26/84)    2.299  (m)            7.54   (f) ADJUSTED    1 2
 HV2005
 HV2005.Superseded values are not recommended for survey control.
 HV2005
 HV2005.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2005.See file dsdata.pdf to determine how the superseded data were derived.
 HV2005
 HV2005_MARKER: DE = TRAVERSE STATION DISK
 HV2005_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV2005_STAMPING: BOAT 1935
 HV2005_MARK LOGO: CGS
 HV2005_PROJECTION: RECESSED 20 CENTIMETERS
 HV2005_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV2005+STABILITY: SURFACE MOTION
 HV2005
 HV2005  HISTORY     - Date     Condition        Report By
 HV2005  HISTORY     - 1935     MONUMENTED       CGS
 HV2005  HISTORY     - 1935     GOOD             CGS
 HV2005  HISTORY     - 1946     GOOD             CGS
 HV2005  HISTORY     - 1959     MARK NOT FOUND   CGS
 HV2005  HISTORY     - 20120422 GOOD             PROFLN
 HV2005  HISTORY     - 20141106 GOOD             PROFLN
 HV2005
 HV2005                          STATION DESCRIPTION
 HV2005
 HV2005'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (LOC)
 HV2005'THIS TRAVERSE STATION IS A STANDARD BRONZE DISK STAMPED BOAT 1935
 HV2005'SET IN THE TOP OF A CONCRETE MONUMENT, 8 INCHES IN DIAMETER AT THE
 HV2005'TOP, 12 INCHES SQUARE AT THE BOTTOM, AND 30 INCHES DEEP WITH THE
 HV2005'MARK 3 INCHES BELOW THE GROUND LEVEL (A 2 1/2-INCH BY 6-INCH BY
 HV2005'6-FOOT OAK PLANK WAS DRIVEN IN THE BOTTOM OF THE HOLE LEAVING
 HV2005'ABOUT 4 INCHES PROTRUDING, WHICH WAS SURROUNDED BY THE CONCRETE
 HV2005'OF THE MONUMENT) IN THE LAWN 36.8 FEET SW OF THE CENTER LINE OF
 HV2005'THE SW GUTTER OF THE DRIVE ALONG THE SW SIDE OF THE POLO FIELD
 HV2005'IN WEST POTOMAC PARK, 44.5 FEET NE OF THE WATER FACE OF THE SEA
 HV2005'WALL, 81.2 FEET SW OF PARK LAMP POST NO. 364, 142.2 FEET S OF
 HV2005'PARK LAMP POST NO. 363, 52.7 FEET N OF A 30-INCH DIAMETER
 HV2005'WILLOW TREE, AND 47.1 FEET S OF A WATER PIPE FOR HOSE CONNECTION
 HV2005'PROTRUDING ABOUT 1 FOOT ABOVE THE GROUND LEVEL.  THIS MARK IS
 HV2005'THE 1/4 MILE MARK FOR THE 1 MILE SPEEDBOAT RACE COURSE WITH
 HV2005'THE ZERO AT GATE.
 HV2005'
 HV2005'REFERENCE MARK NO. 1 IS A STANDARD BRONZE DISK STAMPED NO. 1 1935
 HV2005'SET IN THE TOP OF A GRANITE STONE 2 BY 1.3 FEET BY 0.4 FOOT, WHICH
 HV2005'IS PART OF THE TOP OF THE SEA WALL ALONG WEST POTOMAC PARK
 HV2005'1/4 MILE NW OF THE INLET GATE BRIDGE OF THE TIDAL BASIN.  IT IS
 HV2005'0.45 FOOT IN FROM THE WATER FACE OF THE SEA WALL.  REFERENCE
 HV2005'MARK IS SET ON THE LINE BETWEEN BOAT AND CUP.
 HV2005'
 HV2005'NOTE--DISTANCES MEASURED ON THE GROUND OR SLOPE AS THE CASE MAY BE.
 HV2005
 HV2005                          STATION RECOVERY (1935)
 HV2005
 HV2005'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935
 HV2005'AT WASHINGTON.
 HV2005'THIS TRAVERSE STATION IS A STANDARD BRONZE DISK STAMPED
 HV2005'BOAT 1935 SET IN THE TOP OF A CONCRETE MONUMENT, 8 INCHES IN
 HV2005'DIAMETER AT THE TOP, 12 INCHES SQUARE AT THE BOTTOM, AND
 HV2005'30 INCHES DEEP WITH THE MARK 3 INCHES BLOW THE GROUND LEVEL
 HV2005'(A 2 1/2 INCH BY 6 INCH BY 6 FOOT OAK PLANK WAS DRIVEN IN THE
 HV2005'BOTTOM OF THE HOLE LEAVING ABOUT 4 INCHES PROTRUDING, WHICH WAS
 HV2005'SURROUNDED BY THE CONCRETE OF THE MONUMENT) IN THE LAWN 36.8
 HV2005'FEET SW OF THE CENTERLINE OF THE SW GUTTER OF THE DRIVE ALONG THE
 HV2005'SW SIDE OF THE POLO FIELD IN WEST POTOMAC PARK, 44.5 FEET NE OF
 HV2005'THE WATER FACE OF THE SEA WALL, 81.2 FEET SW OF PARK LAMP POST
 HV2005'NO. 364, 142.2 FEET S OF PARK LAMP POST NO. 363, 52.7 FEET N OF A
 HV2005'30-INCH DIAMETER WILLOW TREE, AND 47.1 FEET S OF A WATER PIPE
 HV2005'FOR HOSE CONNECTION PROTRUDING ABOUT 1 FOOT ABOVE THE GROUND
 HV2005'LEVEL.  THIS MARK IS THE 1/4 MILE MARK FOR THE 1 MILE SPEEDBOAT
 HV2005'RACE COURSE WITH THE ZERO AT GATE.
 HV2005
 HV2005                          STATION RECOVERY (1946)
 HV2005
 HV2005'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV2005'RECOVERED AS DESCRIBED.  MARKS IN GOOD CONDITION.  DESCRIPTION
 HV2005'ADEQUATE.
 HV2005
 HV2005                          STATION RECOVERY (1959)
 HV2005
 HV2005'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (BFL)
 HV2005'STATION SEARCHED FOR BUT NOT FOUND.  PROBABLY LOST OR DESTROYED.
 HV2005'R.M. 1 RECOVERED AS DESCRIBED.  2 MI IS 56.8 FT (17.34 METERS)
 HV2005'FROM THE 30 IN WILLOW TREE MENTIONED IN STATION DESCRIPTION.
 HV2005
 HV2005                          STATION RECOVERY (2012)
 HV2005
 HV2005'RECOVERY NOTE BY PROFESSIONAL LAND SURVEYOR 2012 (JRO)
 HV2005'THE STATION IS IN WEST POTOMAC PARK, ABOUT 0.45 MI (0.7 KM) SOUTHEAST
 HV2005'ALONG OHIO DRIVE FROM THE STATUE OF JOHN ERICSSON, ROUGHLY ACROSS THE
 HV2005'STREET FROM BASEBALL BACKSTOP 5, A FIRE HYDRANT AND A DRINKING
 HV2005'FOUNTAIN. OHIO DRIVE RUNS SOUTHEAST-NORTHWEST HERE.
 HV2005'
 HV2005'THE MARK IS TOWARD THE RIVER FROM A CONCRETE SLAB WITH BENCH AND
 HV2005'TRASH-RECYCLING CANS, 67.5 FT (20.6 M) SOUTH OF A MANHOLE IN THE
 HV2005'STREET, 53.5 FT (16.3 M) SOUTH OF THE MOST SOUTHEASTERLY OF THREE
 HV2005'MANHOLES IN A STORM DRAIN STRUCTURE, 49.3 FT (15.0 M) SOUTH (AZ 180)
 HV2005'FROM A STREETLIGHT, 39.3 FT (11.4 M) SOUTHWEST (AZ 220) FROM THE FACE
 HV2005'OF GRANITE CURB AT A POINT THAT IS 34.5 FT (11.7 M) SOUTHEAST ALONG
 HV2005'THE CURB FROM THE STREETLIGHT, 103.5 FT (31.5 M) WEST-NORTHWEST FROM A
 HV2005'MANHOLE IN OHIO DR, 90.0 FT (27.4 M) WEST-NORTHWEST OF THE MOST
 HV2005'NORTHWEST MANHOLE OF THREE MANHOLES IN A STORM DRAIN STRUCTURE, 84.7
 HV2005'FT (25.8 M) WEST-NORTHWEST OF A SIGNPOST WITH SIGNS -NO PARKING-, 14.7
 HV2005'FT (4.5 M) SOUTHWEST OF THE NORTH CORNER OF THE CONCRETE SLAB AND THE
 HV2005'SOUTHWEST EDGE OF THE ASPHALT SIDEWALK, 10.0 FT (3.0 M) SOUTHWEST OF
 HV2005'THE WEST CORNER OF THE SLAB, 19.0 FT (5.8 M) WEST-NORTHWEST OF SOUTH
 HV2005'CORNER OF SAME, 21.5 FT (6.6 M) SOUTHEAST (AZ 130) OF A 2 INCH (5 CM)
 HV2005'SAPLING, 11.5 FT (3.5 M) NORTHWEST (AZ 310) OF A 2 INCH (5 CM)
 HV2005'SAPLING, ABOUT 1 FT (0.3 M) NORTHEAST TOWARD OHIO DR FROM A LINE
 HV2005'BETWEEN THE TWO SAPLINGS, 39 FT (11.9 M) NORTHEAST OF THE TOP OF BANK
 HV2005'AND RIP RAP, 45 FT (13.7 M) NORTHEAST OF OUTER OR RIVER CORNER OF SEA
 HV2005'WALL, 8 INCHES (20 CM) BELOW GROUND. REFERENCE MARK 1 WAS MEASURED AS
 HV2005'45 FT (13.7 M) SOUTHWEST OF THE MARK IN 1935, AT THE PRESENT OUTER
 HV2005'EDGE OF THE SEA WALL, SO IT DOES NOT LOOK GOOD FOR REFERENCE MARK 1,
 HV2005'WHICH WAS NOT RECOVERED. PERHAPS IT IS STILL THERE, TO BE RECOVERED
 HV2005'WITH THE AID OF A METAL DETECTOR AND SCRAPING AWAY THE GRASS THAT HAS
 HV2005'GROWN UP ON TOP OF THE WALL.
 HV2005
 HV2005                          STATION RECOVERY (2014)
 HV2005
 HV2005'RECOVERY NOTE BY PROFESSIONAL LAND SURVEYOR 2014 (JRO)
 HV2005'A 12 INCH (30 CM) BY 18 INCH PLASTIC VALVE BOX WITH GREEN LID WAS PUT
 HV2005'AROUND THE MARK TODAY IN COOPERATION WITH THE NATIONAL PARK SERVICE.
 HV2005'NEW PHOTOS TAKEN TO SHOW THE BOX.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2006 ***********************************************************************
 HV2006  DESIGNATION -  BOAT RM 1
 HV2006  PID         -  HV2006
 HV2006  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2006  COUNTRY     -  US
 HV2006  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2006
 HV2006                         *CURRENT SURVEY CONTROL
 HV2006  ______________________________________________________________________
 HV2006* NAD 83(1986) POSITION- 38 52 55.56   (N) 077 02 41.22   (W)   HD_HELD1
 HV2006* NAVD 88 ORTHO HEIGHT -     0.641 (meters)        2.10  (feet) ADJUSTED
 HV2006  ______________________________________________________________________
 HV2006  GEOID HEIGHT    -        -32.090 (meters)                     GEOID18
 HV2006  DYNAMIC HEIGHT  -          0.641 (meters)        2.10  (feet) COMP
 HV2006  MODELED GRAVITY -    980,096.3   (mgal)                       NAVD 88
 HV2006
 HV2006  VERT ORDER      -  FIRST     CLASS II
 HV2006
 HV2006.The horizontal coordinates were determined by differentially corrected
 HV2006.hand held GPS observations or other comparable positioning techniques
 HV2006.and have an estimated accuracy of +/- 3 meters.
 HV2006
 HV2006.The orthometric height was determined by differential leveling and
 HV2006.adjusted by the NATIONAL GEODETIC SURVEY
 HV2006.in June 1991.
 HV2006
 HV2006.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2006.GEOID18 height accuracy estimate available here.
 HV2006
 HV2006.Click photographs - Photos may exist for this station.
 HV2006
 HV2006.The dynamic height is computed by dividing the NAVD 88
 HV2006.geopotential number by the normal gravity value computed on the
 HV2006.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2006.degrees latitude (g = 980.6199 gals.).
 HV2006
 HV2006.The modeled gravity was interpolated from observed gravity values.
 HV2006
 HV2006
 HV2006_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2263705680(NAD 83)
 HV2006
 HV2006                          SUPERSEDED SURVEY CONTROL
 HV2006
 HV2006  NGVD 29 (11/26/84)    0.876  (m)            2.87   (f) ADJUSTED    1 2
 HV2006
 HV2006.Superseded values are not recommended for survey control.
 HV2006
 HV2006.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2006.See file dsdata.pdf to determine how the superseded data were derived.
 HV2006
 HV2006_MARKER: DR = REFERENCE MARK DISK
 HV2006_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
 HV2006_SP_SET: SEAWALL
 HV2006_STAMPING: NO 1 1935
 HV2006_MARK LOGO: CGS
 HV2006_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV2006+STABILITY: SURFACE MOTION
 HV2006
 HV2006  HISTORY     - Date     Condition        Report By
 HV2006  HISTORY     - 1935     MONUMENTED       CGS
 HV2006  HISTORY     - 1935     GOOD             CGS
 HV2006
 HV2006                          STATION DESCRIPTION
 HV2006
 HV2006'DESCRIBED BY COAST AND GEODETIC SURVEY 1935
 HV2006'AT WASHINGTON.
 HV2006'A STANDARD BRONZE DISK STAMPED NO. 1 1935 SET IN THE TOP OF A
 HV2006'GRANITE STONE 2 BY 1.3 FEET BY 0.4 FOOT, WHICH IS PART OF THE
 HV2006'TOP OF THE SEA WALL ALONG WEST POTOMAC PARK 1/4 MILE NE OF THE
 HV2006'INLET GATE BRIDGE OF THE TIDAL BASIN.  IT IS 0.45 FOOT IN FROM
 HV2006'THE WATER FACE OF THE SEA WALL, AND 45 FEET SW OF BOAT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DO1151 ***********************************************************************
 DO1151  DESIGNATION -  BOB HUMPHRIES
 DO1151  PID         -  DO1151
 DO1151  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DO1151  COUNTRY     -  US
 DO1151  USGS QUAD   -  WASHINGTON WEST (2016)
 DO1151
 DO1151                         *CURRENT SURVEY CONTROL
 DO1151  ______________________________________________________________________
 DO1151* NAD 83(1986) POSITION- 38 53 39.65   (N) 077 02 11.58   (W)   HD_HELD1
 DO1151* NAVD 88 ORTHO HEIGHT -     5.780 (meters)       18.96  (feet) ADJUSTED
 DO1151  ______________________________________________________________________
 DO1151  GEOID HEIGHT    -        -32.077 (meters)                     GEOID18
 DO1151  DYNAMIC HEIGHT  -          5.777 (meters)       18.95  (feet) COMP
 DO1151  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 DO1151
 DO1151  VERT ORDER      -  FIRST     CLASS II
 DO1151
 DO1151.The horizontal coordinates were determined by differentially corrected
 DO1151.hand held GPS observations or other comparable positioning techniques
 DO1151.and have an estimated accuracy of +/- 3 meters.
 DO1151
 DO1151.The orthometric height was determined by differential leveling and
 DO1151.adjusted by the NATIONAL GEODETIC SURVEY
 DO1151.in October 2012.
 DO1151
 DO1151.Significant digits in the geoid height do not necessarily reflect accuracy.
 DO1151.GEOID18 height accuracy estimate available here.
 DO1151
 DO1151.Click photographs - Photos may exist for this station.
 DO1151
 DO1151.The dynamic height is computed by dividing the NAVD 88
 DO1151.geopotential number by the normal gravity value computed on the
 DO1151.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DO1151.degrees latitude (g = 980.6199 gals.).
 DO1151
 DO1151.The modeled gravity was interpolated from observed gravity values.
 DO1151
 DO1151
 DO1151_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2338107023(NAD 83)
 DO1151
 DO1151                          SUPERSEDED SURVEY CONTROL
 DO1151
 DO1151.No superseded survey control is available for this station.
 DO1151
 DO1151_MARKER: DD = SURVEY DISK
 DO1151_SETTING: 17 = SET INTO TOP OF METAL PIPE DRIVEN INTO GROUND
 DO1151_STAMPING: BOB HUMPHRIES
 DO1151_MARK LOGO: NPS
 DO1151_PROJECTION: RECESSED 15 CENTIMETERS
 DO1151_MAGNETIC: P = MARKER IS A STEEL PIPE
 DO1151_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 DO1151
 DO1151  HISTORY     - Date     Condition        Report By
 DO1151  HISTORY     - UNK      MONUMENTED       NPS
 DO1151  HISTORY     - 20120402 GOOD             NGS
 DO1151
 DO1151                          STATION DESCRIPTION
 DO1151
 DO1151'DESCRIBED BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DO1151'THE MARK IS LOCATED IN WASHINGTON, DC ON THE ELLIPSE.
 DO1151'
 DO1151'IT IS 277.0 FT (84.4 M) SOUTH OF THE ZERO MILESTONE, 149.8 FT (45.7 M)
 DO1151'NORTH OF THE MERIDIAN STONE, 117.4 FT (35.8 M) SOUTHEAST OF WATER WELL
 DO1151'WITH STONE TOP AND 34.9 FT (10.6 M) NORTHWEST OF AN ELECTRIC MANHOLE.
 DO1151'
 DO1151'NOTE-ROD DEPTH UNKNOWN.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1467 ***********************************************************************
 HV1467  DESIGNATION -  BOLT DCDHT
 HV1467  PID         -  HV1467
 HV1467  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1467  COUNTRY     -  US
 HV1467  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1467
 HV1467                         *CURRENT SURVEY CONTROL
 HV1467  ______________________________________________________________________
 HV1467* NAD 83(1986) POSITION- 38 52 51.     (N) 076 57 53.     (W)   SCALED
 HV1467* NAVD 88 ORTHO HEIGHT -    16.835 (meters)       55.23  (feet) ADJUSTED
 HV1467  ______________________________________________________________________
 HV1467  GEOID HEIGHT    -        -32.225 (meters)                     GEOID18
 HV1467  DYNAMIC HEIGHT  -         16.826 (meters)       55.20  (feet) COMP
 HV1467  MODELED GRAVITY -    980,091.8   (mgal)                       NAVD 88
 HV1467
 HV1467  VERT ORDER      -  SECOND    CLASS 0
 HV1467
 HV1467.The horizontal coordinates were scaled from a map and have
 HV1467.an estimated accuracy of +/- 6 seconds.
 HV1467
 HV1467.The orthometric height was determined by differential leveling and
 HV1467.adjusted by the NATIONAL GEODETIC SURVEY
 HV1467.in June 1991.
 HV1467
 HV1467.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1467.GEOID18 height accuracy estimate available here.
 HV1467
 HV1467.Click photographs - Photos may exist for this station.
 HV1467
 HV1467.The dynamic height is computed by dividing the NAVD 88
 HV1467.geopotential number by the normal gravity value computed on the
 HV1467.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1467.degrees latitude (g = 980.6199 gals.).
 HV1467
 HV1467.The modeled gravity was interpolated from observed gravity values.
 HV1467
 HV1467
 HV1467_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ295053(NAD 83)
 HV1467
 HV1467                          SUPERSEDED SURVEY CONTROL
 HV1467
 HV1467  NGVD 29 (11/26/84)   17.073  (m)           56.01   (f) ADJUSTED    2 0
 HV1467
 HV1467.Superseded values are not recommended for survey control.
 HV1467
 HV1467.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1467.See file dsdata.pdf to determine how the superseded data were derived.
 HV1467
 HV1467_MARKER: B = BOLT
 HV1467_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1467_SP_SET: ABUTMENT
 HV1467_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1467
 HV1467  HISTORY     - Date     Condition        Report By
 HV1467  HISTORY     - UNK      MONUMENTED       DCDHT
 HV1467  HISTORY     - 1961     GOOD             CGS
 HV1467
 HV1467                          STATION DESCRIPTION
 HV1467
 HV1467'DESCRIBED BY COAST AND GEODETIC SURVEY 1961
 HV1467'IN WASHINGTON.
 HV1467'IN S.E. WASHINGTON, D.C., IN ANACOSTIA PARK, AT THE W. CORNER
 HV1467'OF BRIDGE 505 CARRYING THE ANACOSTIA FREEWAY OVER THE P.R.R.
 HV1467'FREIGHT YARDS, ON THE NW SIDE OF THE ROADWAY, AT THE SE END OF THE
 HV1467'NW-SE GUARDRAIL ON THE ABUTMENT, THE TOP OF THE SOUTH HOLD-DOWN
 HV1467'BOLT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1862 ***********************************************************************
 HV1862  DESIGNATION -  BRADDOCKS ROCK=TIDAL BM
 HV1862  PID         -  HV1862
 HV1862  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1862  COUNTRY     -  US
 HV1862  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1862
 HV1862                         *CURRENT SURVEY CONTROL
 HV1862  ______________________________________________________________________
 HV1862* NAD 83(1986) POSITION- 38 53 33.94   (N) 077 03 05.15   (W)   HD_HELD1
 HV1862* NAVD 88 ORTHO HEIGHT -     4.399 (meters)       14.43  (feet) ADJUSTED
 HV1862  ______________________________________________________________________
 HV1862  GEOID HEIGHT    -        -32.062 (meters)                     GEOID18
 HV1862  DYNAMIC HEIGHT  -          4.396 (meters)       14.42  (feet) COMP
 HV1862  MODELED GRAVITY -    980,095.5   (mgal)                       NAVD 88
 HV1862
 HV1862  VERT ORDER      -  FIRST     CLASS II
 HV1862
 HV1862.The horizontal coordinates were determined by differentially corrected
 HV1862.hand held GPS observations or other comparable positioning techniques
 HV1862.and have an estimated accuracy of +/- 3 meters.
 HV1862
 HV1862.The orthometric height was determined by differential leveling and
 HV1862.adjusted by the NATIONAL GEODETIC SURVEY
 HV1862.in June 1991.
 HV1862
 HV1862.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1862.GEOID18 height accuracy estimate available here.
 HV1862
 HV1862.Click photographs - Photos may exist for this station.
 HV1862
 HV1862.The dynamic height is computed by dividing the NAVD 88
 HV1862.geopotential number by the normal gravity value computed on the
 HV1862.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1862.degrees latitude (g = 980.6199 gals.).
 HV1862
 HV1862.The modeled gravity was interpolated from observed gravity values.
 HV1862
 HV1862
 HV1862_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2208706876(NAD 83)
 HV1862
 HV1862                          SUPERSEDED SURVEY CONTROL
 HV1862
 HV1862  NGVD 29 (11/26/84)    4.632  (m)           15.20   (f) ADJUSTED    1 2
 HV1862
 HV1862.Superseded values are not recommended for survey control.
 HV1862
 HV1862.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1862.See file dsdata.pdf to determine how the superseded data were derived.
 HV1862
 HV1862_MARKER: B = BOLT
 HV1862_SETTING: 66 = SET IN ROCK OUTCROP
 HV1862_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 HV1862+STABILITY: POSITION/ELEVATION WELL
 HV1862
 HV1862  HISTORY     - Date     Condition        Report By
 HV1862  HISTORY     - UNK      MONUMENTED       CGS
 HV1862  HISTORY     - 1926     GOOD             CGS
 HV1862  HISTORY     - 1956     GOOD             CGS
 HV1862
 HV1862                          STATION DESCRIPTION
 HV1862
 HV1862'DESCRIBED BY COAST AND GEODETIC SURVEY 1926
 HV1862'AT WASHINGTON.
 HV1862'AT WASHINGTON, ON CONSTITUTION AVENUE, AT THE INTERSECTION OF
 HV1862'TWENTY-THIRD STREET NORTHWEST, IN THE FORMER NAVAL HOSPITAL
 HV1862'RESERVATION, AT WARD H (A TEMPORARY FRAME BUILDING SHAPED LIKE A
 HV1862'CAPITAL H), BETWEEN THE TWO LONG WINGS, SOUTHEAST OF THE SHORT
 HV1862'CENTRAL CONNECTING BUILDING, UNDER THE SOUTHWEST SIDE OF THE
 HV1862'BUILDING, AND IN THE TOP OF A ROCK OUTCROP SURROUNDED BY A SQUARE
 HV1862'BRICK WELL ABOUT 8 FEET DEEP.  THE TOP OF A 1-1/2-INCH BOLT.
 HV1862'NOTE-- THIS LOCATION IS KNOWN AS THE KEY OF ALL KEYS.
 HV1862
 HV1862                          STATION RECOVERY (1956)
 HV1862
 HV1862'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956
 HV1862'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4195 ***********************************************************************
 HV4195  DESIGNATION -  BRIDGE
 HV4195  PID         -  HV4195
 HV4195  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4195  COUNTRY     -  US
 HV4195  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4195
 HV4195                         *CURRENT SURVEY CONTROL
 HV4195  ______________________________________________________________________
 HV4195* NAD 83(1993) POSITION- 38 54 06.27182(N) 077 04 12.97386(W)   ADJUSTED
 HV4195* NAVD 88 ORTHO HEIGHT -   101.    (meters)      331.    (feet) SCALED
 HV4195  ______________________________________________________________________
 HV4195  GEOID HEIGHT    -        -32.020 (meters)                     GEOID18
 HV4195  LAPLACE CORR    -         -2.87  (seconds)                    DEFLEC18
 HV4195  HORZ ORDER      -  SECOND
 HV4195
 HV4195.The horizontal coordinates were established by classical geodetic methods
 HV4195.and adjusted by the National Geodetic Survey in November 1994.
 HV4195
 HV4195.The orthometric height was scaled from a topographic map.
 HV4195
 HV4195.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4195.GEOID18 height accuracy estimate available here.
 HV4195
 HV4195.Click photographs - Photos may exist for this station.
 HV4195
 HV4195.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4195
 HV4195. The following values were computed from the NAD 83(1993) position.
 HV4195
 HV4195;                    North         East     Units Scale Factor Converg.
 HV4195;SPC MD       -   137,101.042   393,904.613   MT  0.99994995   -0 02 38.8
 HV4195;SPC MD       -   449,805.67  1,292,335.38   sFT  0.99994995   -0 02 38.8
 HV4195;SPC VA N     - 2,138,059.262 3,624,013.547   MT  0.99996066   +0 53 32.4
 HV4195;SPC VA N     - 7,014,616.10 11,889,784.45   sFT  0.99996066   +0 53 32.4
 HV4195;UTM  18      - 4,307,910.192   320,475.624   MT  0.99999687   -1 18 01.6
 HV4195
 HV4195!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4195!SPC MD       -   0.99998921  x   0.99994995  =   0.99993916
 HV4195!SPC VA N     -   0.99998921  x   0.99996066  =   0.99994987
 HV4195!UTM  18      -   0.99998921  x   0.99999687  =   0.99998608
 HV4195
 HV4195:                Primary Azimuth Mark                     Grid Az
 HV4195:SPC MD       -  BOUNDARY WITNESS MK 7 DC VA              154 21 36.9
 HV4195:SPC VA N     -  BOUNDARY WITNESS MK 7 DC VA              153 25 25.7
 HV4195:UTM  18      -  BOUNDARY WITNESS MK 7 DC VA              155 36 59.7
 HV4195
 HV4195_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2047507910(NAD 83)
 HV4195
 HV4195|---------------------------------------------------------------------|
 HV4195| PID    Reference Object                     Distance      Geod. Az  |
 HV4195|                                                           dddmmss.s |
 HV4195| HV1694 BOUNDARY WITNESS MK 7 DC VA         APPROX. 2.6 KM 1541858.1 |
 HV4195| HV3961 GEORGETOWN UNIV LOWER SPIRE         APPROX. 0.6 KM 3385627.2 |
 HV4195|---------------------------------------------------------------------|
 HV4195
 HV4195                          SUPERSEDED SURVEY CONTROL
 HV4195
 HV4195  NAD 83(1991)-  38 54 06.27058(N)    077 04 12.97543(W) AD(       ) 2
 HV4195  NAD 83(1986)-  38 54 06.27032(N)    077 04 12.98566(W) AD(       ) 2
 HV4195  NAD 27      -  38 54 05.87000(N)    077 04 14.05900(W) AD(       ) 2
 HV4195
 HV4195.Superseded values are not recommended for survey control.
 HV4195
 HV4195.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4195.See file dsdata.pdf to determine how the superseded data were derived.
 HV4195
 HV4195_MARKER: DD = SURVEY DISK
 HV4195_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV4195_SP_SET: SIDEWALK
 HV4195_MARK LOGO: USACE
 HV4195_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4195
 HV4195  HISTORY     - Date     Condition        Report By
 HV4195  HISTORY     - 1924     MONUMENTED       USACE
 HV4195  HISTORY     - 1925     GOOD             CGS
 HV4195  HISTORY     - 1930     GOOD             CGS
 HV4195  HISTORY     - 1935     GOOD             CGS
 HV4195  HISTORY     - 1938     GOOD             CGS
 HV4195  HISTORY     - 1946     GOOD             CGS
 HV4195  HISTORY     - 1947     GOOD             CGS
 HV4195  HISTORY     - 1957     SEE DESCRIPTION  CGS
 HV4195  HISTORY     - 19950607 MARK NOT FOUND   USPSQD
 HV4195  HISTORY     - 19950818 MARK NOT FOUND   USPSQD
 HV4195
 HV4195                          STATION DESCRIPTION
 HV4195
 HV4195'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1924 (EWE)
 HV4195'STATION IS ON THE KEY BRIDGE ACROSS THE POTOMAC RIVER AT
 HV4195'GEORGETOWN, ABOUT IN THE CENTER OF THE HIGHEST PORTION OF THE
 HV4195'BRIDGE, ON THE SIDEWALK AND 2 FEET FROM THE W WALL.  A BRICK
 HV4195'CHIMNEY NEAR THE GAS PLANT AND THE CAPITOL DOME ARE ON RANGE.
 HV4195'STATION IS MARKED BY A STANDARD U.S.E. DISK SET IN THE CEMENT
 HV4195'SIDEWALK.
 HV4195
 HV4195                          STATION RECOVERY (1925)
 HV4195
 HV4195'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1925 (GLB)
 HV4195'STATION FOUND AS DESCRIBED.
 HV4195
 HV4195                          STATION RECOVERY (1930)
 HV4195
 HV4195'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1930 (PP)
 HV4195'STATION IS LOCATED ON KEY BRIDGE, WHICH SPANS THE POTOMAC RIVER
 HV4195'AT WASHINGTON, D.C. AND ROSSLYN, VIRGINIA.
 HV4195'
 HV4195'THIS STATION IS ON U.S. SIDEWALK DIRECTLY OVER 3RD CROSS WALL
 HV4195'OF SECOND ARCH COUNTING FROM VIRGINIA SIDE.
 HV4195'
 HV4195'THE STATION IS 6 FEET FROM EDGE OF CURB AND 640.7 (MEASURED
 HV4195'FLAT ON SIDEWALK) FROM VIRGINIA END OF BALUSTRADE.
 HV4195'
 HV4195'THE STATION IS MARKED WITH A STANDARD PUBLIC BUILDING AND
 HV4195'PUBLIC PARKS BRASS DISK SET IN CONCRETE SIDEWALK.
 HV4195'
 HV4195'THIS STATION WAS ESTABLISHED BY LIEUTENANT BEAN OF U.S.C. AND G.S.
 HV4195'FOR U.S.P.S. AND P.P. IN 1925.
 HV4195
 HV4195                          STATION RECOVERY (1935)
 HV4195
 HV4195'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4195'THE STATION IS MARKED BY A DISK OF THE CORPS OF ENGINEERS SET
 HV4195'FLUSH IN THE WALK ALONG THE W SIDE OF THE KEY BRIDGE AT
 HV4195'GEORGETOWN, ON THE S GRADE OF THE CAMBER OF THE BRIDGE, BETWEEN
 HV4195'TH 7TH AND 8TH LIGHT POST TO THE S OF THE TABLET FRANCIS SCOTT
 HV4195'KEY BRIDGE.  THESE POSTS ARE NUMBERED 33 AND 34 RESPECTIVELY.
 HV4195'THE MARK IS 4.1 METERS SSE OF POST NUMBER 33 AND 7.9 METERS NNE
 HV4195'OF POST NUMBER 34, 1.804 METERS W OF THE W CURB OF THE ROADWAY,
 HV4195'AND 0.622 METER E OF THE INSIDE OF THE W WALL.  AT THE STATION
 HV4195'IT WAS NOTED THAT A STACK NEAR THE GAS PLANT WAS IN RANGE
 HV4195'WITH THE CAPITOL DOME, AND THAT A STACK LETTERED D.C. PAPER
 HV4195'MANUFACTURING COMPANY, WAS IN RANGE WITH A LIGHT POST ON THE E SIDE
 HV4195'OF THE BRIDGE.
 HV4195'
 HV4195'NO REFERENCE MARKS HAVE BEEN ESTABLISHED.
 HV4195
 HV4195                          STATION RECOVERY (1938)
 HV4195
 HV4195'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4195'STATION RECOVERED AS DESCRIBED.
 HV4195
 HV4195                          STATION RECOVERY (1946)
 HV4195
 HV4195'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (RCB)
 HV4195'THE STATION WAS RECOVERED AS DESCRIBED AND THE MARK WAS FOUND
 HV4195'TO BE IN GOOD CONDITION.  A COMPLETE NEW DESCRIPTION FOLLOWS--
 HV4195'THE STATION IS LOCATED ON THE KEY BRIDGE ACROSS THE POTOMAC.
 HV4195'IT IS BETWEEN THE 17TH AND 18TH LIGHT POLES FROM THE VIRGINIA
 HV4195'SIDE OF THE BRIDGE, IN A DRILL HOLE IN THE SIDEWALK ON THE
 HV4195'UPSTREAM SIDE, 6 FEET FROM THE CURB AND 2 FEET FROM THE RAILING.
 HV4195'THE DISK IS A STANDARD U.S. ENGINEERS BRASS DISK.
 HV4195
 HV4195                          STATION RECOVERY (1947)
 HV4195
 HV4195'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947 (EAD)
 HV4195'THE DESCRIPTION SUBMITTED BY R.C. BOLSTAD, 1947, IS ADEQUATE.
 HV4195'THE NUMBERING OF THE LAMPPOSTS MENTIONED HAS BEEN CHANGED.
 HV4195
 HV4195                          STATION RECOVERY (1957)
 HV4195
 HV4195'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1957 (ROW)
 HV4195'VIRGINIA BASE
 HV4195'
 HV4195'VIRGINIA BASE 1
 HV4195'
 HV4195'BRIDGE 1924
 HV4195'
 HV4195'WASHINGTON BASE
 HV4195'
 HV4195'WASHINGTON BASE 1
 HV4195'
 HV4195'STATION DESTROYED.  THE ENTIRE SURFACE OF THE BRIDGE WAS REBUILT
 HV4195'DURING THE WINTER OF 1956-57.  A THIRD TRAFFIC LANE WAS ADDED
 HV4195'IN BOTH DIRECTIONS IN PLACE OF THE OLD SIDEWALKS.  NEW SIDEWALKS
 HV4195'WERE PLACED BY EXTENDING THE WIDTH OF THE BRIDGE ON BOTH SIDES
 HV4195'APPARENTLY BY CANTILEVER BRACING.
 HV4195'
 HV4195'REPLACEMENT STATIONS WERE ESTABLISHED AND OBSERVATIONS TYING THEM
 HV4195'IN WERE MADE BY THE U.S.S.D. AFTER THE BRIDGE WAS OCCUPIED.
 HV4195
 HV4195                          STATION RECOVERY (1995)
 HV4195
 HV4195'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4195'MARK NOT FOUND.
 HV4195
 HV4195                          STATION RECOVERY (1995)
 HV4195
 HV4195'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4195'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7558 ***********************************************************************
 HV7558  DESIGNATION -  BRIDGE USE 1923
 HV7558  PID         -  HV7558
 HV7558  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7558  COUNTRY     -  US
 HV7558  USGS QUAD   -  ANACOSTIA (2016)
 HV7558
 HV7558                         *CURRENT SURVEY CONTROL
 HV7558  ______________________________________________________________________
 HV7558* NAD 83(1993) POSITION- 38 52 19.96005(N) 076 59 28.17121(W)   ADJUSTED
 HV7558* NAVD 88 ORTHO HEIGHT -     3.    (meters)       10.    (feet) SCALED
 HV7558  ______________________________________________________________________
 HV7558  GEOID HEIGHT    -        -32.191 (meters)                     GEOID18
 HV7558  LAPLACE CORR    -         -3.15  (seconds)                    DEFLEC18
 HV7558  HORZ ORDER      -  THIRD
 HV7558
 HV7558.The horizontal coordinates were established by classical geodetic methods
 HV7558.and adjusted by the National Geodetic Survey in November 1994.
 HV7558
 HV7558.The orthometric height was scaled from a topographic map.
 HV7558
 HV7558.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7558.GEOID18 height accuracy estimate available here.
 HV7558
 HV7558.Click photographs - Photos may exist for this station.
 HV7558
 HV7558.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7558
 HV7558. The following values were computed from the NAD 83(1993) position.
 HV7558
 HV7558;                    North         East     Units Scale Factor Converg.
 HV7558;SPC MD       -   133,820.558   400,767.230   MT  0.99994985   +0 00 20.0
 HV7558;SPC MD       -   439,042.95  1,314,850.49   sFT  0.99994985   +0 00 20.0
 HV7558;SPC VA N     - 2,134,891.324 3,630,928.918   MT  0.99995824   +0 56 30.1
 HV7558;SPC VA N     - 7,004,222.62 11,912,472.63   sFT  0.99995824   +0 56 30.1
 HV7558;UTM  18      - 4,304,479.971   327,264.909   MT  0.99996742   -1 14 59.8
 HV7558
 HV7558!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7558!SPC MD       -   1.00000462  x   0.99994985  =   0.99995447
 HV7558!SPC VA N     -   1.00000462  x   0.99995824  =   0.99996286
 HV7558!UTM  18      -   1.00000462  x   0.99996742  =   0.99997204
 HV7558
 HV7558:                Primary Azimuth Mark                     Grid Az
 HV7558:SPC MD       -  KNOLL USE 1931                           048 02 10.4
 HV7558:SPC VA N     -  KNOLL USE 1931                           047 06 00.3
 HV7558:UTM  18      -  KNOLL USE 1931                           049 17 30.2
 HV7558
 HV7558_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2726404479(NAD 83)
 HV7558
 HV7558|---------------------------------------------------------------------|
 HV7558| PID    Reference Object                     Distance      Geod. Az  |
 HV7558|                                                           dddmmss.s |
 HV7558| HV7682 KNOLL USE 1931                      APPROX. 0.7 KM 0480230.4 |
 HV7558| HV7560 RAY USE 1923                        332.879 METERS 14701     |
 HV7558| HV7573 CHICAGO USE 1923                    441.721 METERS 2015044.5 |
 HV7558| HV7568 SLIP USE 1923                       288.832 METERS 25750     |
 HV7558|---------------------------------------------------------------------|
 HV7558
 HV7558                          SUPERSEDED SURVEY CONTROL
 HV7558
 HV7558  NAD 83(1991)-  38 52 19.95865(N)    076 59 28.17242(W) AD(       ) 3
 HV7558  NAD 83(1986)-  38 52 19.95810(N)    076 59 28.18358(W) AD(       ) 3
 HV7558  NAD 27      -  38 52 19.55500(N)    076 59 29.27100(W) AD(       ) 3
 HV7558
 HV7558.Superseded values are not recommended for survey control.
 HV7558
 HV7558.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7558.See file dsdata.pdf to determine how the superseded data were derived.
 HV7558
 HV7558
 HV7558  HISTORY     - Date     Condition        Report By
 HV7558  HISTORY     - 1923     MONUMENTED       CGS
 HV7558  HISTORY     - 1958     MARK NOT FOUND   CGS
 HV7558
 HV7558                          STATION DESCRIPTION
 HV7558
 HV7558'DESCRIBED BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7558'THIS STATION IS NOT RECOVERABLE DUE TO THE LACK OF DESCRIPTION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4314 ***********************************************************************
 HV4314  DESIGNATION -  BROAD
 HV4314  PID         -  HV4314
 HV4314  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4314  COUNTRY     -  US
 HV4314  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4314
 HV4314                         *CURRENT SURVEY CONTROL
 HV4314  ______________________________________________________________________
 HV4314* NAD 83(1993) POSITION- 38 56 15.88034(N) 077 03 32.69265(W)   ADJUSTED
 HV4314  ______________________________________________________________________
 HV4314  GEOID HEIGHT    -        -31.979 (meters)                     GEOID18
 HV4314  LAPLACE CORR    -         -2.99  (seconds)                    DEFLEC18
 HV4314  HORZ ORDER      -  THIRD
 HV4314
 HV4314.The horizontal coordinates were established by classical geodetic methods
 HV4314.and adjusted by the National Geodetic Survey in November 1994.
 HV4314
 HV4314.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4314.GEOID18 height accuracy estimate available here.
 HV4314
 HV4314.Click photographs - Photos may exist for this station.
 HV4314
 HV4314.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4314
 HV4314. The following values were computed from the NAD 83(1993) position.
 HV4314
 HV4314;                    North         East     Units Scale Factor Converg.
 HV4314;SPC MD       -   141,096.920   394,877.772   MT  0.99995043   -0 02 13.5
 HV4314;SPC MD       -   462,915.48  1,295,528.16   sFT  0.99995043   -0 02 13.5
 HV4314;SPC VA N     - 2,142,070.558 3,624,921.284   MT  0.99996397   +0 53 57.5
 HV4314;SPC VA N     - 7,027,776.49 11,892,762.58   sFT  0.99996397   +0 53 57.5
 HV4314;UTM  18      - 4,311,883.939   321,536.243   MT  0.99999219   -1 17 39.9
 HV4314
 HV4314_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2153611883(NAD 83)
 HV4314
 HV4314                          SUPERSEDED SURVEY CONTROL
 HV4314
 HV4314  NAD 83(1991)-  38 56 15.87961(N)    077 03 32.69388(W) AD(       ) 3
 HV4314  NAD 83(1986)-  38 56 15.87917(N)    077 03 32.70405(W) AD(       ) 3
 HV4314  NAD 27      -  38 56 15.48000(N)    077 03 33.78100(W) AD(       ) 3
 HV4314
 HV4314.Superseded values are not recommended for survey control.
 HV4314
 HV4314.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4314.See file dsdata.pdf to determine how the superseded data were derived.
 HV4314
 HV4314_MARKER: 82 = FINIAL
 HV4314
 HV4314  HISTORY     - Date     Condition        Report By
 HV4314  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4314  HISTORY     - 19950617 GOOD             USPSQD
 HV4314  HISTORY     - 20021024 MARK NOT FOUND   INDIV
 HV4314  HISTORY     - 20100314 MARK NOT FOUND   GEOCAC
 HV4314
 HV4314                          STATION DESCRIPTION
 HV4314
 HV4314'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4314'STATION IS THE CENTER OF BALL-TIPPED FINIAL ON NORTHERN END
 HV4314'OF HIPPED ROOF OF WESTERN PENTHOUSE ON WESTERN SIDE OF THE
 HV4314'BROADMOOR APARTMENTS BUILDING, 3601 CONNECTICUT AVE., N.W.
 HV4314'
 HV4314'THIS IS THE ONLY FINIAL ON THE PENTHOUSE.
 HV4314
 HV4314                          STATION RECOVERY (1995)
 HV4314
 HV4314'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4314'RECOVERED IN GOOD CONDITION.
 HV4314
 HV4314                          STATION RECOVERY (2002)
 HV4314
 HV4314'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 HV4314'HIP ROOF PENTHOUSE OBSERVED FROM GROUND, BUT WITHOUT BALL-TIPPED
 HV4314'FINIAL.
 HV4314
 HV4314                          STATION RECOVERY (2010)
 HV4314
 HV4314'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 HV4314'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DF6525 ***********************************************************************
 DF6525  DESIGNATION -  BUCHMAN
 DF6525  PID         -  DF6525
 DF6525  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DF6525  COUNTRY     -  US
 DF6525  USGS QUAD   -  WASHINGTON EAST (2016)
 DF6525
 DF6525                         *CURRENT SURVEY CONTROL
 DF6525  ______________________________________________________________________
 DF6525* NAD 83(2011) POSITION- 38 55 05.46021(N) 076 56 35.66528(W)   ADJUSTED
 DF6525* NAD 83(2011) ELLIP HT-   -23.458 (meters)        (06/27/12)   ADJUSTED
 DF6525* NAD 83(2011) EPOCH   -  2010.00
 DF6525* NAVD 88 ORTHO HEIGHT -     8.8   (meters)       29.    (feet) GPS OBS
 DF6525  ______________________________________________________________________
 DF6525  NAVD 88 orthometric height was determined with geoid model    GEOID99
 DF6525  GEOID HEIGHT    -        -32.179 (meters)                     GEOID99
 DF6525  GEOID HEIGHT    -        -32.213 (meters)                     GEOID18
 DF6525  NAD 83(2011) X  -  1,122,582.113 (meters)                     COMP
 DF6525  NAD 83(2011) Y  - -4,840,554.701 (meters)                     COMP
 DF6525  NAD 83(2011) Z  -  3,985,239.510 (meters)                     COMP
 DF6525  LAPLACE CORR    -         -4.65  (seconds)                    DEFLEC18
 DF6525
 DF6525  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 DF6525  Standards:
 DF6525         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 DF6525            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 DF6525  -------------------------------------------------------------------
 DF6525  NETWORK    0.14   1.16           0.06   0.05   0.59     -0.03494497
 DF6525  -------------------------------------------------------------------
 DF6525  Click here for local accuracies and other accuracy information.
 DF6525
 DF6525.The horizontal coordinates were established by GPS observations
 DF6525.and adjusted by the National Geodetic Survey in June 2012.
 DF6525
 DF6525.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 DF6525.been affixed to the stable North American tectonic plate. See 
 DF6525.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 DF6525
 DF6525.The horizontal coordinates are valid at the epoch date displayed above
 DF6525.which is a decimal equivalence of Year/Month/Day.
 DF6525
 DF6525.The orthometric height was determined by GPS observations and a
 DF6525.high-resolution geoid model.
 DF6525
 DF6525.Significant digits in the geoid height do not necessarily reflect accuracy.
 DF6525.GEOID18 height accuracy estimate available here.
 DF6525
 DF6525.Click photographs - Photos may exist for this station.
 DF6525
 DF6525.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 DF6525
 DF6525.The Laplace correction was computed from DEFLEC18 derived deflections.
 DF6525
 DF6525.The ellipsoidal height was determined by GPS observations
 DF6525.and is referenced to NAD 83.
 DF6525
 DF6525. The following values were computed from the NAD 83(2011) position.
 DF6525
 DF6525;                    North         East     Units Scale Factor Converg.
 DF6525;UTM  18      - 4,309,492.483   331,530.914   MT  0.99994949   -1 13 15.8
 DF6525
 DF6525!             -  Elev Factor  x  Scale Factor =   Combined Factor
 DF6525!UTM  18      -   1.00000368  x   0.99994949  =   0.99995317
 DF6525
 DF6525_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3153009492(NAD 83)
 DF6525
 DF6525                          SUPERSEDED SURVEY CONTROL
 DF6525
 DF6525  NAD 83(2007)-  38 55 05.46042(N)    076 56 35.66595(W) AD(2002.00) 0
 DF6525  ELLIP H (02/10/07)  -23.441  (m)                       GP(2002.00)    
 DF6525  NAD 83(1991)-  38 55 05.46048(N)    076 56 35.66604(W) AD(       ) B
 DF6525  ELLIP H (07/23/03)  -23.443  (m)                       GP(       ) 3 2
 DF6525
 DF6525.Superseded values are not recommended for survey control.
 DF6525
 DF6525.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 DF6525.See file dsdata.pdf to determine how the superseded data were derived.
 DF6525
 DF6525_MARKER: DH = HORIZONTAL CONTROL DISK
 DF6525_SETTING: 37 = SET IN A MASSIVE RETAINING WALL
 DF6525_SP_SET: TOP OF BRIDGE ABUTMENT
 DF6525_STAMPING: BUCHMAN 2003
 DF6525_MARK LOGO: NGS
 DF6525_MAGNETIC: N = NO MAGNETIC MATERIAL
 DF6525_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 DF6525_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 DF6525+SATELLITE: SATELLITE OBSERVATIONS - May 12, 2003
 DF6525
 DF6525  HISTORY     - Date     Condition        Report By
 DF6525  HISTORY     - 20030512 MONUMENTED       NGS
 DF6525
 DF6525                          STATION DESCRIPTION
 DF6525
 DF6525'DESCRIBED BY NATIONAL GEODETIC SURVEY 2003 (CSC)
 DF6525'THE MARK IS LOCATED JUST WITHIN THE BOUNDARY OF WASHINGTON, D.C., ON
 DF6525'THE WEST SIDE OF THE U.S. ROUTE 50 ANACOSTIA RIVER BRIDGE WHERE THE
 DF6525'ANACOSTIA RIVER ENTERS D.C.
 DF6525'
 DF6525'TO REACH FROM THE INTERSECTION OF U.S. ROUTE 50 AND INTERSTATE 295
 DF6525'(THE BALTIMORE-WASHINGTON PARKWAY), GO WEST 0.6 KM (0.35 MI) ACROSS
 DF6525'THE ANACOSTIA RIVER TO THE WEST BRIDGE ABUTMENT AND THE MARK ON THE
 DF6525'RIGHT.
 DF6525'
 DF6525'THE STATION IS 2.6 KM (1.6 MI) EAST OF THE TURN-AROUND FOR THE
 DF6525'NATIONAL ARBORETUM, 2.6 KM (1.6 MI) EAST OF THE INTERSECTION OF
 DF6525'OF ROUTE 50 AND BLADENSBURG ROAD, AND 2.3 KM (1.2 MI)
 DF6525'EAST OF THE ENTRANCE TO THE NATIONAL ARBORETUM.  THE MARK IS SET IN
 DF6525'THE TOP OF THE CAPSTONE OF THE EAST END OF THE NORTH-WEST
 DF6525'ABUTMENT OF THE 6 LANE ROUTE 50 BRIDGE
 DF6525'OVER THE ANACOSTIA RIVER.  IT IS 1.5 M (5 FT) EAST OF A LAMP POST SET
 DF6525'ATOP THE SAME ABUTMENT AND 0.6 M (2 FT) FROM THE EAST EDGE OF THE
 DF6525'ABUTMENT.  THE MARK IS A STANDARD NGS HORIZONTAL CONTROL SET FLUSH
 DF6525'IN THE CAPSTONE AND STAMPED--BUCHMAN 2003--.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI7415 ***********************************************************************
 AI7415  DESIGNATION -  BUILDING 52
 AI7415  PID         -  AI7415
 AI7415  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI7415  COUNTRY     -  US
 AI7415  USGS QUAD   -  WASHINGTON WEST (2016)
 AI7415
 AI7415                         *CURRENT SURVEY CONTROL
 AI7415  ______________________________________________________________________
 AI7415* NAD 83(2011) POSITION- 38 55 08.96166(N) 077 04 00.01681(W)   ADJUSTED
 AI7415* NAD 83(2011) ELLIP HT-    50.109 (meters)        (06/27/12)   ADJUSTED
 AI7415* NAD 83(2011) EPOCH   -  2010.00
 AI7415* NAVD 88 ORTHO HEIGHT -    82.1   (meters)      269.    (feet) GPS OBS
 AI7415  ______________________________________________________________________
 AI7415  NAVD 88 orthometric height was determined with geoid model    GEOID99
 AI7415  GEOID HEIGHT    -        -31.955 (meters)                     GEOID99
 AI7415  GEOID HEIGHT    -        -31.993 (meters)                     GEOID18
 AI7415  NAD 83(2011) X  -  1,112,149.249 (meters)                     COMP
 AI7415  NAD 83(2011) Y  - -4,842,951.495 (meters)                     COMP
 AI7415  NAD 83(2011) Z  -  3,985,369.735 (meters)                     COMP
 AI7415  LAPLACE CORR    -         -2.94  (seconds)                    DEFLEC18
 AI7415
 AI7415  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AI7415  Standards:
 AI7415         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AI7415            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AI7415  -------------------------------------------------------------------
 AI7415  NETWORK    0.21   0.71           0.09   0.08   0.36      0.00041570
 AI7415  -------------------------------------------------------------------
 AI7415  Click here for local accuracies and other accuracy information.
 AI7415
 AI7415.The horizontal coordinates were established by GPS observations
 AI7415.and adjusted by the National Geodetic Survey in June 2012.
 AI7415
 AI7415.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AI7415.been affixed to the stable North American tectonic plate. See 
 AI7415.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AI7415
 AI7415.The horizontal coordinates are valid at the epoch date displayed above
 AI7415.which is a decimal equivalence of Year/Month/Day.
 AI7415
 AI7415.The orthometric height was determined by GPS observations and a
 AI7415.high-resolution geoid model.
 AI7415
 AI7415.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI7415.GEOID18 height accuracy estimate available here.
 AI7415
 AI7415.Click photographs - Photos may exist for this station.
 AI7415
 AI7415.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AI7415
 AI7415.The Laplace correction was computed from DEFLEC18 derived deflections.
 AI7415
 AI7415.The ellipsoidal height was determined by GPS observations
 AI7415.and is referenced to NAD 83.
 AI7415
 AI7415. The following values were computed from the NAD 83(2011) position.
 AI7415
 AI7415;                    North         East     Units Scale Factor Converg.
 AI7415;UTM  18      - 4,309,835.784   320,831.563   MT  0.99999530   -1 17 55.2
 AI7415
 AI7415!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AI7415!UTM  18      -   0.99999214  x   0.99999530  =   0.99998744
 AI7415
 AI7415_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2083109835(NAD 83)
 AI7415
 AI7415                          SUPERSEDED SURVEY CONTROL
 AI7415
 AI7415  NAD 83(2007)-  38 55 08.96187(N)    077 04 00.01751(W) AD(2002.00) 0
 AI7415  ELLIP H (02/10/07)   50.125  (m)                       GP(2002.00)    
 AI7415  ELLIP H (08/09/02)   50.129  (m)                       GP(       ) 3 2
 AI7415  NAD 83(1991)-  38 55 08.96198(N)    077 04 00.01774(W) AD(       ) B
 AI7415  ELLIP H (08/03/00)   50.123  (m)                       GP(       ) 2 1
 AI7415
 AI7415.Superseded values are not recommended for survey control.
 AI7415
 AI7415.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AI7415.See file dsdata.pdf to determine how the superseded data were derived.
 AI7415
 AI7415_MARKER: Z = SEE DESCRIPTION
 AI7415_SETTING: 37 = SET IN A MASSIVE RETAINING WALL
 AI7415_SP_SET: PARAPET WALL
 AI7415_MARK LOGO: NONE
 AI7415_MAGNETIC: N = NO MAGNETIC MATERIAL
 AI7415_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 AI7415_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AI7415+SATELLITE: SATELLITE OBSERVATIONS - March 30, 2000
 AI7415
 AI7415  HISTORY     - Date     Condition        Report By
 AI7415  HISTORY     - 1997     MONUMENTED       NGS
 AI7415  HISTORY     - 20000330 GOOD             NGS
 AI7415
 AI7415                          STATION DESCRIPTION
 AI7415
 AI7415'DESCRIBED BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 AI7415'2.75 MI (4.4 KM) SOUTHEAST ALONG MASSACHUSETTS AVE FROM THE
 AI7415'INTERSECTION WITH WESTERN AVE AT WESTMORELAND CIRCLE AT THE MARYLAND
 AI7415'AND DISTRICT OF COLUMBIA STATE LINE, TO THE INTERSECTION OF
 AI7415'OBSERVATORY CIRCLE NW, THENCE 0.2 MI (0.32 KM) NORTHWEST ALONG
 AI7415'OBSERVATORY CIRCLE NW TO THE GUARD HOUSE, THENCE .05 MI (0.08 KM)
 AI7415'NORTH ALONG A PAVED ROAD TO THE TOP OF INCLINE TO THE SECOND SIDEWALK
 AI7415'LEADING TH THE ENTRANCE OF BUILDING NUMBER 52, GO TO THE ROOF AND ON
 AI7415'THE WEST WALL OF BUILDING, 28.7 FT (8.7 M) WEST OF SOUTHEAST CORNER OF
 AI7415'BUILDING ROOF, 53.0 FEET (16.1 M) SOUTHEAST OF SOUTHEAST CORNER WALL
 AI7415'OF A ROOF STAIRWELL, 23.0 FT (7.0 M) SOUTH OF A BLACK PLATFORM
 AI7415'SUPPORTING A AIR CONDITION UNIT, AND 7 IN (17.7 CM) NORTH OF WALL. THE
 AI7415'MARK IS A 3/4 INCH SCREW BOLT EPOXYED IN TOP OF THE PARAPET WALL.
 AI7415'NOTE--CALL HEAD OF EARTH ORIENTATION DEPT. (JIM RAY) AT 202-762-1444
 AI7415'BEFORE ENTERING THE OBSERVATORY GROUNDS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4522 ***********************************************************************
 HV4522  DESIGNATION -  BUREAU ENGRAVING RED TWR
 HV4522  PID         -  HV4522
 HV4522  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4522  COUNTRY     -  US
 HV4522  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4522
 HV4522                         *CURRENT SURVEY CONTROL
 HV4522  ______________________________________________________________________
 HV4522* NAD 83(1993) POSITION- 38 53 14.71513(N) 077 01 56.11910(W)   ADJUSTED
 HV4522  ______________________________________________________________________
 HV4522  GEOID HEIGHT    -        -32.097 (meters)                     GEOID18
 HV4522  LAPLACE CORR    -         -2.62  (seconds)                    DEFLEC18
 HV4522  HORZ ORDER      -  THIRD
 HV4522
 HV4522.The horizontal coordinates were established by classical geodetic methods
 HV4522.and adjusted by the National Geodetic Survey in November 1994.
 HV4522
 HV4522.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4522.GEOID18 height accuracy estimate available here.
 HV4522
 HV4522.Click photographs - Photos may exist for this station.
 HV4522
 HV4522.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4522
 HV4522. The following values were computed from the NAD 83(1993) position.
 HV4522
 HV4522;                    North         East     Units Scale Factor Converg.
 HV4522;SPC MD       -   135,509.413   397,201.557   MT  0.99994987   -0 01 12.9
 HV4522;SPC MD       -   444,583.80  1,303,152.11   sFT  0.99994987   -0 01 12.9
 HV4522;SPC VA N     - 2,136,521.707 3,627,336.094   MT  0.99995945   +0 54 57.8
 HV4522;SPC VA N     - 7,009,571.63 11,900,685.17   sFT  0.99995945   +0 54 57.8
 HV4522;UTM  18      - 4,306,246.604   323,737.013   MT  0.99998258   -1 16 34.2
 HV4522
 HV4522_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2373706246(NAD 83)
 HV4522
 HV4522                          SUPERSEDED SURVEY CONTROL
 HV4522
 HV4522  NAD 83(1991)-  38 53 14.71391(N)    077 01 56.12056(W) AD(       ) 3
 HV4522  NAD 83(1986)-  38 53 14.71341(N)    077 01 56.13146(W) AD(       ) 3
 HV4522  NAD 27      -  38 53 14.31102(N)    077 01 57.21433(W) AD(       ) 3
 HV4522
 HV4522.Superseded values are not recommended for survey control.
 HV4522
 HV4522.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4522.See file dsdata.pdf to determine how the superseded data were derived.
 HV4522
 HV4522_MARKER: 55 = TOWER
 HV4522_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4522+SATELLITE: SATELLITE OBSERVATIONS - March 19, 2009
 HV4522
 HV4522  HISTORY     - Date     Condition        Report By
 HV4522  HISTORY     - 1979     FIRST OBSERVED   NGS
 HV4522  HISTORY     - 20030801 GOOD             GEOCAC
 HV4522  HISTORY     - 20050718 GOOD             USPSQD
 HV4522  HISTORY     - 20090319 GOOD             GEOCAC
 HV4522
 HV4522                          STATION DESCRIPTION
 HV4522
 HV4522'DESCRIBED BY NATIONAL GEODETIC SURVEY 1979 (BMP)
 HV4522'THE STATION IS THE RED TOWER ON THE OLD SECTION OF THE BUREAU OF
 HV4522'ENGRAVING BUILDING ON THE SOUTHWEST CORNER OF THE INTERSECTION
 HV4522'OF INDEPENDENCE AVENUE AND 14TH STREET IN WASHINGTON D.C. THE
 HV4522'TOWER IS APPROXIMATELY 50 METERS HIGH.
 HV4522
 HV4522                          STATION RECOVERY (2003)
 HV4522
 HV4522'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV4522'TOWER IS ATOP THE AUDITOR'S BUILDING
 HV4522
 HV4522                          STATION RECOVERY (2005)
 HV4522
 HV4522'RECOVERY NOTE BY US POWER SQUADRON 2005 (FM)
 HV4522'RECOVERED IN GOOD CONDITION.
 HV4522
 HV4522                          STATION RECOVERY (2009)
 HV4522
 HV4522'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV4522'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4206 ***********************************************************************
 HV4206  DESIGNATION -  BUREAU STANDARDS WIRELESS TWR
 HV4206  PID         -  HV4206
 HV4206  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4206  COUNTRY     -  US
 HV4206  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4206
 HV4206                         *CURRENT SURVEY CONTROL
 HV4206  ______________________________________________________________________
 HV4206* NAD 83(1993) POSITION- 38 56 31.21738(N) 077 04 03.81276(W)   ADJUSTED
 HV4206  ______________________________________________________________________
 HV4206  GEOID HEIGHT    -        -31.960 (meters)                     GEOID18
 HV4206  LAPLACE CORR    -         -3.11  (seconds)                    DEFLEC18
 HV4206  HORZ ORDER      -  THIRD
 HV4206
 HV4206.The horizontal coordinates were established by classical geodetic methods
 HV4206.and adjusted by the National Geodetic Survey in November 1994.
 HV4206
 HV4206.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4206.GEOID18 height accuracy estimate available here.
 HV4206
 HV4206.Click photographs - Photos may exist for this station.
 HV4206
 HV4206.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4206
 HV4206. The following values were computed from the NAD 83(1993) position.
 HV4206
 HV4206;                    North         East     Units Scale Factor Converg.
 HV4206;SPC MD       -   141,570.370   394,128.665   MT  0.99995051   -0 02 33.0
 HV4206;SPC MD       -   464,468.79  1,293,070.46   sFT  0.99995051   -0 02 33.0
 HV4206;SPC VA N     - 2,142,531.709 3,624,164.529   MT  0.99996438   +0 53 38.1
 HV4206;SPC VA N     - 7,029,289.45 11,890,279.79   sFT  0.99996438   +0 53 38.1
 HV4206;UTM  18      - 4,312,373.735   320,797.673   MT  0.99999545   -1 17 59.9
 HV4206
 HV4206_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2079712373(NAD 83)
 HV4206
 HV4206                          SUPERSEDED SURVEY CONTROL
 HV4206
 HV4206  NAD 83(1991)-  38 56 31.21666(N)    077 04 03.81390(W) AD(       ) 3
 HV4206  NAD 83(1986)-  38 56 31.21624(N)    077 04 03.82398(W) AD(       ) 3
 HV4206  NAD 27      -  38 56 30.82000(N)    077 04 04.90100(W) AD(       ) 3
 HV4206  USSD        -  38 56 31.15600(N)    077 04 04.72100(W) AD(       ) 3
 HV4206
 HV4206.Superseded values are not recommended for survey control.
 HV4206
 HV4206.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4206.See file dsdata.pdf to determine how the superseded data were derived.
 HV4206
 HV4206_MARKER: 55 = TOWER
 HV4206
 HV4206  HISTORY     - Date     Condition        Report By
 HV4206  HISTORY     - 1917     FIRST OBSERVED   CGS
 HV4206
 HV4206                          STATION DESCRIPTION
 HV4206
 HV4206'NO DESCRIPTIVE TEXT AVAILABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4665 ***********************************************************************
 HV4665  DESIGNATION -  BUZZARD PT PEPCO CENTER STACK
 HV4665  PID         -  HV4665
 HV4665  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4665  COUNTRY     -  US
 HV4665  USGS QUAD   -  ALEXANDRIA (2019)
 HV4665
 HV4665                         *CURRENT SURVEY CONTROL
 HV4665  ______________________________________________________________________
 HV4665* NAD 83(1993) POSITION- 38 51 55.35604(N) 077 00 42.18255(W)   ADJUSTED
 HV4665  ______________________________________________________________________
 HV4665  GEOID HEIGHT    -        -32.170 (meters)                     GEOID18
 HV4665  LAPLACE CORR    -         -3.05  (seconds)                    DEFLEC18
 HV4665  HORZ ORDER      -  THIRD
 HV4665
 HV4665.The horizontal coordinates were established by classical geodetic methods
 HV4665.and adjusted by the National Geodetic Survey in November 1994.
 HV4665
 HV4665.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4665.GEOID18 height accuracy estimate available here.
 HV4665
 HV4665.Click photographs - Photos may exist for this station.
 HV4665
 HV4665.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4665
 HV4665. The following values were computed from the NAD 83(1993) position.
 HV4665
 HV4665;                    North         East     Units Scale Factor Converg.
 HV4665;SPC MD       -   133,061.912   398,983.096   MT  0.99994986   -0 00 26.5
 HV4665;SPC MD       -   436,553.96  1,308,997.04   sFT  0.99994986   -0 00 26.5
 HV4665;SPC VA N     - 2,134,103.622 3,629,157.404   MT  0.99995772   +0 55 43.9
 HV4665;SPC VA N     - 7,001,638.30 11,906,660.58   sFT  0.99995772   +0 55 43.9
 HV4665;UTM  18      - 4,303,760.580   325,464.544   MT  0.99997512   -1 15 45.6
 HV4665
 HV4665_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2546403760(NAD 83)
 HV4665
 HV4665                          SUPERSEDED SURVEY CONTROL
 HV4665
 HV4665  NAD 83(1991)-  38 51 55.35460(N)    077 00 42.18395(W) AD(       ) 3
 HV4665  NAD 83(1986)-  38 51 55.35434(N)    077 00 42.19480(W) AD(       ) 3
 HV4665  NAD 27      -  38 51 54.95100(N)    077 00 43.27900(W) AD(       ) 3
 HV4665
 HV4665.Superseded values are not recommended for survey control.
 HV4665
 HV4665.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4665.See file dsdata.pdf to determine how the superseded data were derived.
 HV4665
 HV4665_MARKER: 63 = STACK
 HV4665
 HV4665  HISTORY     - Date     Condition        Report By
 HV4665  HISTORY     - 1946     FIRST OBSERVED   CGS
 HV4665  HISTORY     - 1974     GOOD             NGS
 HV4665  HISTORY     - 19950619 GOOD             USPSQD
 HV4665  HISTORY     - 20030817 GOOD             GEOCAC
 HV4665
 HV4665                          STATION DESCRIPTION
 HV4665
 HV4665'DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (RCB)
 HV4665'THE POINT OBSERVED UPON WAS THE RIGHT AND LEFT TANGENTS OF THE
 HV4665'CENTER STACK OF THREE IN A ROW FROM N TO S.  THE STACK IS
 HV4665'LOCATED AT THE NW CORNER OF FIRST STREET SW AND V STREET.  THE
 HV4665'STACK IS OF WHITE BRICK CONSTRUCTION, OCTAGON SHAPED, AND IS
 HV4665'APPROXIMATELY 200 FEET TALL.
 HV4665
 HV4665                          STATION RECOVERY (1974)
 HV4665
 HV4665'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974 (GWJ)
 HV4665'STATION RECOVERED AS DESCRIBED BY RCB IN 1946.
 HV4665'
 HV4665'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DC.
 HV4665
 HV4665                          STATION RECOVERY (1995)
 HV4665
 HV4665'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4665'RECOVERED IN GOOD CONDITION.
 HV4665
 HV4665                          STATION RECOVERY (2003)
 HV4665
 HV4665'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV4665'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4664 ***********************************************************************
 HV4664  DESIGNATION -  BUZZARD PT PLANT PEPCO STACK
 HV4664  PID         -  HV4664
 HV4664  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4664  COUNTRY     -  US
 HV4664  USGS QUAD   -  ALEXANDRIA (2019)
 HV4664
 HV4664                         *CURRENT SURVEY CONTROL
 HV4664  ______________________________________________________________________
 HV4664* NAD 83(1993) POSITION- 38 51 54.27632(N) 077 00 42.18333(W)   ADJUSTED
 HV4664  ______________________________________________________________________
 HV4664  GEOID HEIGHT    -        -32.170 (meters)                     GEOID18
 HV4664  LAPLACE CORR    -         -3.04  (seconds)                    DEFLEC18
 HV4664  HORZ ORDER      -  THIRD
 HV4664
 HV4664.The horizontal coordinates were established by classical geodetic methods
 HV4664.and adjusted by the National Geodetic Survey in November 1994.
 HV4664
 HV4664.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4664.GEOID18 height accuracy estimate available here.
 HV4664
 HV4664.Click photographs - Photos may exist for this station.
 HV4664
 HV4664.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4664
 HV4664. The following values were computed from the NAD 83(1993) position.
 HV4664
 HV4664;                    North         East     Units Scale Factor Converg.
 HV4664;SPC MD       -   133,028.618   398,983.073   MT  0.99994987   -0 00 26.5
 HV4664;SPC MD       -   436,444.72  1,308,996.97   sFT  0.99994987   -0 00 26.5
 HV4664;SPC VA N     - 2,134,070.332 3,629,157.924   MT  0.99995770   +0 55 43.9
 HV4664;SPC VA N     - 7,001,529.08 11,906,662.29   sFT  0.99995770   +0 55 43.9
 HV4664;UTM  18      - 4,303,727.294   325,463.791   MT  0.99997513   -1 15 45.5
 HV4664
 HV4664_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2546303727(NAD 83)
 HV4664
 HV4664                          SUPERSEDED SURVEY CONTROL
 HV4664
 HV4664  NAD 83(1991)-  38 51 54.27493(N)    077 00 42.18467(W) AD(       ) 3
 HV4664  NAD 83(1986)-  38 51 54.27464(N)    077 00 42.19566(W) AD(       ) 3
 HV4664  NAD 27      -  38 51 53.87100(N)    077 00 43.28000(W) AD(       ) 3
 HV4664
 HV4664.Superseded values are not recommended for survey control.
 HV4664
 HV4664.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4664.See file dsdata.pdf to determine how the superseded data were derived.
 HV4664
 HV4664_MARKER: 63 = STACK
 HV4664
 HV4664  HISTORY     - Date     Condition        Report By
 HV4664  HISTORY     - 1934     FIRST OBSERVED   CGS
 HV4664  HISTORY     - 1938     GOOD             CGS
 HV4664  HISTORY     - 19950619 GOOD             USPSQD
 HV4664
 HV4664                          STATION DESCRIPTION
 HV4664
 HV4664'DESCRIBED BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4664'STATION NOT PREVIOUSLY DESCRIBED.  RECOVERED.  MASONRY STACK ABOUT
 HV4664'150 FEET HIGH, AMONG THE P.E.P. COMPANY POWER PLANT BUILDING
 HV4664'ON THE ANACOSTIA RIVER AT BUZZARD POINT.
 HV4664
 HV4664                          STATION RECOVERY (1995)
 HV4664
 HV4664'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4664'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1842 ***********************************************************************
 HV1842  DESIGNATION -  C 1
 HV1842  PID         -  HV1842
 HV1842  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1842  COUNTRY     -  US
 HV1842  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1842
 HV1842                         *CURRENT SURVEY CONTROL
 HV1842  ______________________________________________________________________
 HV1842* NAD 83(1986) POSITION- 38 53 22.1    (N) 077 02 06.5    (W)   HD_HELD2
 HV1842* NAVD 88 ORTHO HEIGHT -    12.322 (meters)       40.43  (feet) ADJUSTED
 HV1842  ______________________________________________________________________
 HV1842  GEOID HEIGHT    -        -32.089 (meters)                     GEOID18
 HV1842  DYNAMIC HEIGHT  -         12.316 (meters)       40.41  (feet) COMP
 HV1842  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 HV1842
 HV1842  VERT ORDER      -  FIRST     CLASS I
 HV1842
 HV1842.The horizontal coordinates were established by autonomous hand held GPS
 HV1842.observations and have an estimated accuracy of +/- 10 meters.
 HV1842
 HV1842.The orthometric height was determined by differential leveling and
 HV1842.adjusted by the NATIONAL GEODETIC SURVEY
 HV1842.in June 1991.
 HV1842
 HV1842.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1842.GEOID18 height accuracy estimate available here.
 HV1842
 HV1842.Click photographs - Photos may exist for this station.
 HV1842
 HV1842.The dynamic height is computed by dividing the NAVD 88
 HV1842.geopotential number by the normal gravity value computed on the
 HV1842.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1842.degrees latitude (g = 980.6199 gals.).
 HV1842
 HV1842.The modeled gravity was interpolated from observed gravity values.
 HV1842
 HV1842
 HV1842_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2349106479(NAD 83)
 HV1842
 HV1842                          SUPERSEDED SURVEY CONTROL
 HV1842
 HV1842  NGVD 29 (11/26/84)   12.557  (m)           41.20   (f) ADJUSTED    1 1
 HV1842
 HV1842.Superseded values are not recommended for survey control.
 HV1842
 HV1842.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1842.See file dsdata.pdf to determine how the superseded data were derived.
 HV1842
 HV1842_MARKER: DD = SURVEY DISK
 HV1842_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1842_SP_SET: DOORSILL
 HV1842_STAMPING: C 1 1923
 HV1842_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1842
 HV1842  HISTORY     - Date     Condition        Report By
 HV1842  HISTORY     - 1923     MONUMENTED       CGS
 HV1842  HISTORY     - 1971     GOOD             NGS
 HV1842  HISTORY     - 1974     GOOD             NGS
 HV1842  HISTORY     - 19920512 MARK NOT FOUND   NGS
 HV1842
 HV1842                          STATION DESCRIPTION
 HV1842
 HV1842'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1842'AT WASHINGTON.
 HV1842'AT WASHINGTON, D.C., AT THE WASHINGTON MONUMENT, SET IN THE
 HV1842'TOP OF THE NORTH END OF THE GRANITE DOORSILL ON THE EAST SIDE
 HV1842'OF THE MONUMENT, 12 INCHES SOUTH OF A CONCRETE WALL, AND 8 INCHES
 HV1842'ABOVE THE LANDING AT THE ENTRANCE TO THE MONUMENT.  NOTE-- THERE
 HV1842'IS A DOOR ABOVE THE MARK WHICH CAN BE PUSHED ASIDE IN ORDER TO
 HV1842'PLUMB THE ROD.
 HV1842
 HV1842                          STATION RECOVERY (1974)
 HV1842
 HV1842'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974
 HV1842'RECOVERED IN GOOD CONDITION.
 HV1842
 HV1842                          STATION RECOVERY (1992)
 HV1842
 HV1842'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1842'PARK RANGERS STATED THE MARK HAD BEEN DESTROYED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1969 ***********************************************************************
 HV1969  DESIGNATION -  C 231 PBPP
 HV1969  PID         -  HV1969
 HV1969  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1969  COUNTRY     -  US
 HV1969  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1969
 HV1969                         *CURRENT SURVEY CONTROL
 HV1969  ______________________________________________________________________
 HV1969* NAD 83(1986) POSITION- 38 55 59.     (N) 077 06 43.     (W)   SCALED
 HV1969* NAVD 88 ORTHO HEIGHT -    38.063 (meters)      124.88  (feet) ADJUSTED
 HV1969  ______________________________________________________________________
 HV1969  GEOID HEIGHT    -        -31.920 (meters)                     GEOID18
 HV1969  DYNAMIC HEIGHT  -         38.042 (meters)      124.81  (feet) COMP
 HV1969  MODELED GRAVITY -    980,094.2   (mgal)                       NAVD 88
 HV1969
 HV1969  VERT ORDER      -  FIRST     CLASS II
 HV1969
 HV1969.The horizontal coordinates were scaled from a map and have
 HV1969.an estimated accuracy of +/- 6 seconds.
 HV1969
 HV1969.The orthometric height was determined by differential leveling and
 HV1969.adjusted by the NATIONAL GEODETIC SURVEY
 HV1969.in June 1991.
 HV1969
 HV1969.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1969.GEOID18 height accuracy estimate available here.
 HV1969
 HV1969.Click photographs - Photos may exist for this station.
 HV1969
 HV1969.The dynamic height is computed by dividing the NAVD 88
 HV1969.geopotential number by the normal gravity value computed on the
 HV1969.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1969.degrees latitude (g = 980.6199 gals.).
 HV1969
 HV1969.The modeled gravity was interpolated from observed gravity values.
 HV1969
 HV1969
 HV1969_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ169114(NAD 83)
 HV1969
 HV1969                          SUPERSEDED SURVEY CONTROL
 HV1969
 HV1969  NGVD 29 (11/26/84)   38.290  (m)          125.62   (f) ADJUSTED    1 2
 HV1969
 HV1969.Superseded values are not recommended for survey control.
 HV1969
 HV1969.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1969.See file dsdata.pdf to determine how the superseded data were derived.
 HV1969
 HV1969_MARKER: DD = SURVEY DISK
 HV1969_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1969_SP_SET: CHIMNEY
 HV1969_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1969
 HV1969  HISTORY     - Date     Condition        Report By
 HV1969  HISTORY     - UNK      MONUMENTED       PBPP
 HV1969  HISTORY     - 1931     GOOD             PBPP
 HV1969  HISTORY     - 1960     GOOD             CGS
 HV1969
 HV1969                          STATION DESCRIPTION
 HV1969
 HV1969'DESCRIBED BY PUB BLDGS AND PARKS 1931
 HV1969'AT WASHINGTON.
 HV1969'AT WASHINGTON, ON POTOMAC AVENUE NORTHWEST, ABOUT 1000 FEET ABOVE
 HV1969'CHAIN BRIDGE, ON THE SOUTH SIDE OF THE HOUSE AT 5731 POTOMAC
 HV1969'AVENUE, IN THE SOUTH FACE OF THE EXPOSED BRICK CHIMNEY, 1.5 FEET
 HV1969'EAST OF THE WEST END OF THE CHIMNEY, AND ABOUT 2 FEET ABOVE THE
 HV1969'GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK, SET
 HV1969'VERTICALLY.
 HV1969
 HV1969                          STATION RECOVERY (1960)
 HV1969
 HV1969'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1969'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1236 ***********************************************************************
 HV1236  DESIGNATION -  C 3
 HV1236  PID         -  HV1236
 HV1236  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1236  COUNTRY     -  US
 HV1236  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1236
 HV1236                         *CURRENT SURVEY CONTROL
 HV1236  ______________________________________________________________________
 HV1236* NAD 83(1986) POSITION- 38 53 47.     (N) 076 55 35.     (W)   SCALED
 HV1236* NAVD 88 ORTHO HEIGHT -    18.280 (meters)       59.97  (feet) ADJUSTED
 HV1236  ______________________________________________________________________
 HV1236  GEOID HEIGHT    -        -32.284 (meters)                     GEOID18
 HV1236  DYNAMIC HEIGHT  -         18.270 (meters)       59.94  (feet) COMP
 HV1236  MODELED GRAVITY -    980,086.6   (mgal)                       NAVD 88
 HV1236
 HV1236  VERT ORDER      -  FIRST     CLASS II
 HV1236
 HV1236.The horizontal coordinates were scaled from a map and have
 HV1236.an estimated accuracy of +/- 6 seconds.
 HV1236
 HV1236.The orthometric height was determined by differential leveling and
 HV1236.adjusted by the NATIONAL GEODETIC SURVEY
 HV1236.in June 1991.
 HV1236
 HV1236.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1236.GEOID18 height accuracy estimate available here.
 HV1236
 HV1236.Click photographs - Photos may exist for this station.
 HV1236
 HV1236.The dynamic height is computed by dividing the NAVD 88
 HV1236.geopotential number by the normal gravity value computed on the
 HV1236.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1236.degrees latitude (g = 980.6199 gals.).
 HV1236
 HV1236.The modeled gravity was interpolated from observed gravity values.
 HV1236
 HV1236
 HV1236_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ329070(NAD 83)
 HV1236
 HV1236                          SUPERSEDED SURVEY CONTROL
 HV1236
 HV1236  NGVD 29 (11/26/84)   18.516  (m)           60.75   (f) ADJUSTED    1 2
 HV1236
 HV1236.Superseded values are not recommended for survey control.
 HV1236
 HV1236.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1236.See file dsdata.pdf to determine how the superseded data were derived.
 HV1236
 HV1236_MARKER: DB = BENCH MARK DISK
 HV1236_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1236_SP_SET: SIDEWALK
 HV1236_STAMPING: C 3 1951
 HV1236_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1236
 HV1236  HISTORY     - Date     Condition        Report By
 HV1236  HISTORY     - 1951     MONUMENTED       CGS
 HV1236
 HV1236                          STATION DESCRIPTION
 HV1236
 HV1236'DESCRIBED BY COAST AND GEODETIC SURVEY 1951
 HV1236'AT WASHINGTON.
 HV1236'IN NORTHEAST WASHINGTON, NEAR THE INTERSECTION OF DIVISON
 HV1236'AVENUE AND FITCH PLACE, N.E., AT A BRIDGE OVER A STREAM, NEAR
 HV1236'THE SOUTHWEST CORNER OF THE BRIDGE, 4.6 FEET WEST OF THE FACE OF
 HV1236'THE WEST CURB, 0.4 FOOT EAST OF THE EAST FACE OF THE WEST
 HV1236'SIDE WALL, 1.5 FEET NORTH OF SOUTH END OF STRAIGHT PORTION OF
 HV1236'WEST SIDE WALL, AND IN THE SURFACE OF THE CONCRETE WALK.  A
 HV1236'BRASS DISK, STAMPED C 3 1951.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1238 ***********************************************************************
 HV1238  DESIGNATION -  C 3 A
 HV1238  PID         -  HV1238
 HV1238  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1238  COUNTRY     -  US
 HV1238  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1238
 HV1238                         *CURRENT SURVEY CONTROL
 HV1238  ______________________________________________________________________
 HV1238* NAD 83(1986) POSITION- 38 53 47.     (N) 076 55 34.     (W)   SCALED
 HV1238* NAVD 88 ORTHO HEIGHT -    18.290 (meters)       60.01  (feet) ADJUSTED
 HV1238  ______________________________________________________________________
 HV1238  GEOID HEIGHT    -        -32.284 (meters)                     GEOID18
 HV1238  DYNAMIC HEIGHT  -         18.280 (meters)       59.97  (feet) COMP
 HV1238  MODELED GRAVITY -    980,086.6   (mgal)                       NAVD 88
 HV1238
 HV1238  VERT ORDER      -  FIRST     CLASS II
 HV1238
 HV1238.The horizontal coordinates were scaled from a map and have
 HV1238.an estimated accuracy of +/- 6 seconds.
 HV1238
 HV1238.The orthometric height was determined by differential leveling and
 HV1238.adjusted by the NATIONAL GEODETIC SURVEY
 HV1238.in June 1991.
 HV1238
 HV1238.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1238.GEOID18 height accuracy estimate available here.
 HV1238
 HV1238.Click photographs - Photos may exist for this station.
 HV1238
 HV1238.The dynamic height is computed by dividing the NAVD 88
 HV1238.geopotential number by the normal gravity value computed on the
 HV1238.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1238.degrees latitude (g = 980.6199 gals.).
 HV1238
 HV1238.The modeled gravity was interpolated from observed gravity values.
 HV1238
 HV1238
 HV1238_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ329070(NAD 83)
 HV1238
 HV1238                          SUPERSEDED SURVEY CONTROL
 HV1238
 HV1238  NGVD 29 (11/26/84)   18.528  (m)           60.79   (f) ADJUSTED    1 2
 HV1238
 HV1238.Superseded values are not recommended for survey control.
 HV1238
 HV1238.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1238.See file dsdata.pdf to determine how the superseded data were derived.
 HV1238
 HV1238_MARKER: Z = SEE DESCRIPTION
 HV1238_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1238_SP_SET: CONC BOX ON BRIDGE
 HV1238_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1238
 HV1238  HISTORY     - Date     Condition        Report By
 HV1238  HISTORY     - UNK      MONUMENTED       CGS
 HV1238  HISTORY     - 1929     GOOD             CGS
 HV1238
 HV1238                          STATION DESCRIPTION
 HV1238
 HV1238'DESCRIBED BY COAST AND GEODETIC SURVEY 1929
 HV1238'IN WASHINGTON.
 HV1238'IN NORTHEAST WASHINGTON, NEAR THE INTERSECTION OF DIVISION
 HV1238'AVENUE AND FITCH PLACE NORTHEAST, AT A BRIDGE OVER A STREAM,
 HV1238'NEAR THE NORTHEAST CORNER OF THE BRIDGE, ON A 2-FOOT-SQUARE
 HV1238'CONCRETE BOX HAVING A 1-FOOT-SQUARE IRON COVER MARKED FUEL OIL,
 HV1238'0.2 FOOT SOUTHWEST OF THE NORTHEAST EDGE OF THE CONCRETE, AND
 HV1238'0.2 FOOT NORTHWEST OF THE SOUTHEAST EDGE.  A CONICAL DENT 0.03
 HV1238'FOOT IN DIAMETER AT THE SURFACE.  NOTE-- TO USE THIS MARK,
 HV1238'PLACE A 3/8-INCH BALL BEARING IN THE DENT (AFTER BLOWING OUT
 HV1238'DUST AND DIRT) AND STAND THE ROD ON THE BALL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1237 ***********************************************************************
 HV1237  DESIGNATION -  C 3 RESET 1952
 HV1237  PID         -  HV1237
 HV1237  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1237  COUNTRY     -  US
 HV1237  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1237
 HV1237                         *CURRENT SURVEY CONTROL
 HV1237  ______________________________________________________________________
 HV1237* NAD 83(1986) POSITION- 38 53 47.     (N) 076 55 35.     (W)   SCALED
 HV1237* NAVD 88 ORTHO HEIGHT -    18.277 (meters)       59.96  (feet) ADJUSTED
 HV1237  ______________________________________________________________________
 HV1237  GEOID HEIGHT    -        -32.284 (meters)                     GEOID18
 HV1237  DYNAMIC HEIGHT  -         18.267 (meters)       59.93  (feet) COMP
 HV1237  MODELED GRAVITY -    980,086.6   (mgal)                       NAVD 88
 HV1237
 HV1237  VERT ORDER      -  FIRST     CLASS II
 HV1237
 HV1237.The horizontal coordinates were scaled from a map and have
 HV1237.an estimated accuracy of +/- 6 seconds.
 HV1237
 HV1237.The orthometric height was determined by differential leveling and
 HV1237.adjusted by the NATIONAL GEODETIC SURVEY
 HV1237.in June 1991.
 HV1237
 HV1237.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1237.GEOID18 height accuracy estimate available here.
 HV1237
 HV1237.Click photographs - Photos may exist for this station.
 HV1237
 HV1237.The dynamic height is computed by dividing the NAVD 88
 HV1237.geopotential number by the normal gravity value computed on the
 HV1237.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1237.degrees latitude (g = 980.6199 gals.).
 HV1237
 HV1237.The modeled gravity was interpolated from observed gravity values.
 HV1237
 HV1237
 HV1237_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ329070(NAD 83)
 HV1237
 HV1237                          SUPERSEDED SURVEY CONTROL
 HV1237
 HV1237  NGVD 29 (11/26/84)   18.515  (m)           60.74   (f) ADJUSTED    1 2
 HV1237
 HV1237.Superseded values are not recommended for survey control.
 HV1237
 HV1237.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1237.See file dsdata.pdf to determine how the superseded data were derived.
 HV1237
 HV1237_MARKER: DB = BENCH MARK DISK
 HV1237_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1237_SP_SET: SIDEWALK
 HV1237_STAMPING: C 3 RESET 1952
 HV1237_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1237
 HV1237  HISTORY     - Date     Condition        Report By
 HV1237  HISTORY     - 1952     MONUMENTED       CGS
 HV1237  HISTORY     - 1960     GOOD             CGS
 HV1237
 HV1237                          STATION DESCRIPTION
 HV1237
 HV1237'DESCRIBED BY COAST AND GEODETIC SURVEY 1952
 HV1237'IN WASHINGTON.
 HV1237'IN NORTHEAST WASHINGTON, NEAR THE INTERSECTION OF DIVISION
 HV1237'AVENUE AND FITCH PLACE NORTHEAST, AT A BRIDGE OVER A STREAM,
 HV1237'NEAR THE SOUTHWWEST CORNER OF THE BRIDGE, 4.6 FEET WEST OF
 HV1237'THE WEST CURB, 1.5 FEET NORTH OF THE SOUTH END OF THE STRAIGHT
 HV1237'PORTION OF THE WEST SIDE WALL, 0.4 FOOT EAST OF THE EAST FACE OF
 HV1237'THE WEST SIDE WALL, AND IN THE SURFACE OF THE CONCRETE WALK.
 HV1237'A STANDARD DISK, STAMPED C 3 RESET 1952.
 HV1237
 HV1237                          STATION RECOVERY (1960)
 HV1237
 HV1237'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1237'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1471 ***********************************************************************
 HV1471  DESIGNATION -  C 5
 HV1471  PID         -  HV1471
 HV1471  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1471  COUNTRY     -  US
 HV1471  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1471
 HV1471                         *CURRENT SURVEY CONTROL
 HV1471  ______________________________________________________________________
 HV1471* NAD 83(1986) POSITION- 38 53 16.6    (N) 077 00 13.1    (W)   HD_HELD2
 HV1471* NAVD 88 ORTHO HEIGHT -    27.126 (meters)       89.00  (feet) ADJUSTED
 HV1471  ______________________________________________________________________
 HV1471  GEOID HEIGHT    -        -32.141 (meters)                     GEOID18
 HV1471  DYNAMIC HEIGHT  -         27.111 (meters)       88.95  (feet) COMP
 HV1471  MODELED GRAVITY -    980,100.3   (mgal)                       NAVD 88
 HV1471
 HV1471  VERT ORDER      -  FIRST     CLASS II
 HV1471
 HV1471.The horizontal coordinates were established by autonomous hand held GPS
 HV1471.observations and have an estimated accuracy of +/- 10 meters.
 HV1471
 HV1471.The orthometric height was determined by differential leveling and
 HV1471.adjusted by the NATIONAL GEODETIC SURVEY
 HV1471.in August 2020.
 HV1471
 HV1471.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1471.GEOID18 height accuracy estimate available here.
 HV1471
 HV1471.Click photographs - Photos may exist for this station.
 HV1471
 HV1471.The dynamic height is computed by dividing the NAVD 88
 HV1471.geopotential number by the normal gravity value computed on the
 HV1471.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1471.degrees latitude (g = 980.6199 gals.).
 HV1471
 HV1471.The modeled gravity was interpolated from observed gravity values.
 HV1471
 HV1471
 HV1471_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2622006249(NAD 83)
 HV1471
 HV1471                          SUPERSEDED SURVEY CONTROL
 HV1471
 HV1471  NAVD 88 (06/15/91)   27.118  (m)           88.97   (f) SUPERSEDED  1 1
 HV1471  NGVD 29 (11/26/84)   27.355  (m)           89.75   (f) ADJUSTED    1 1
 HV1471
 HV1471.Superseded values are not recommended for survey control.
 HV1471
 HV1471.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1471.See file dsdata.pdf to determine how the superseded data were derived.
 HV1471
 HV1471_MARKER: DB = BENCH MARK DISK
 HV1471_SETTING: 34 = SET IN THE FOOTINGS OF SMALL/MEDIUM STRUCTURES
 HV1471_SP_SET: AIR VENT
 HV1471_STAMPING: C 5 1971
 HV1471_MARK LOGO: CGS
 HV1471_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1471+STABILITY: SURFACE MOTION
 HV1471_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1471+SATELLITE: SATELLITE OBSERVATIONS - January 14, 2020
 HV1471
 HV1471  HISTORY     - Date     Condition        Report By
 HV1471  HISTORY     - 1971     MONUMENTED       NGS
 HV1471  HISTORY     - 20200114 GOOD             MDSHA
 HV1471
 HV1471                          STATION DESCRIPTION
 HV1471
 HV1471'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1471'IN WASHINGTON.
 HV1471'AT WASHINGTON, D.C., AT THE JUNCTION OF PENNSYLVANIA AVENUE,
 HV1471'INDEPENDENCE AVENUE AND SE 2ND STREET, SET IN THE TOP OF THE
 HV1471'SOUTHWEST CORNER OF AN 11-FOOT BY 8-FOOT BY 14-FOOT DEEP CONCRETE
 HV1471'AIR VENT IN THE LAWN OF THE LIBRARY OF CONGRESS, 138.0 FEET
 HV1471'SOUTHEAST OF THE SOUTHEAST CORNER OF THE BUILDING, 86 1/2
 HV1471'FEET NORTH OF THE NORTH CURB OF INDEPENDENCE AVENUE, 24 FEET
 HV1471'EAST OF THE EAST CURB OF SE 2ND STREET, ABOUT 1 FOOT ABOVE THE
 HV1471'LEVEL OF THE GROUND, AND ABOUT 3 FEET ABOVE THE LEVEL OF THE
 HV1471'STREET.
 HV1471
 HV1471                          STATION RECOVERY (2020)
 HV1471
 HV1471'RECOVERY NOTE BY MARYLAND DOT HIGHWAY ADMINISTRATION 2020 (JML)
 HV1471'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8080 ***********************************************************************
 HV8080  DESIGNATION -  C 8
 HV8080  PID         -  HV8080
 HV8080  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8080  COUNTRY     -  US
 HV8080  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8080
 HV8080                         *CURRENT SURVEY CONTROL
 HV8080  ______________________________________________________________________
 HV8080* NAD 83(1986) POSITION- 38 54 30.     (N) 077 04 27.     (W)   SCALED
 HV8080* NAVD 88 ORTHO HEIGHT -    33.201 (meters)      108.93  (feet) ADJUSTED
 HV8080  ______________________________________________________________________
 HV8080  GEOID HEIGHT    -        -32.002 (meters)                     GEOID18
 HV8080  DYNAMIC HEIGHT  -         33.183 (meters)      108.87  (feet) COMP
 HV8080  MODELED GRAVITY -    980,091.3   (mgal)                       NAVD 88
 HV8080
 HV8080  VERT ORDER      -  FIRST     CLASS I
 HV8080
 HV8080.The horizontal coordinates were scaled from a map and have
 HV8080.an estimated accuracy of +/- 6 seconds.
 HV8080
 HV8080.The orthometric height was determined by differential leveling and
 HV8080.adjusted by the NATIONAL GEODETIC SURVEY
 HV8080.in June 1991.
 HV8080
 HV8080.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8080.GEOID18 height accuracy estimate available here.
 HV8080
 HV8080.Click photographs - Photos may exist for this station.
 HV8080
 HV8080.The dynamic height is computed by dividing the NAVD 88
 HV8080.geopotential number by the normal gravity value computed on the
 HV8080.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8080.degrees latitude (g = 980.6199 gals.).
 HV8080
 HV8080.The modeled gravity was interpolated from observed gravity values.
 HV8080
 HV8080
 HV8080_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ201086(NAD 83)
 HV8080
 HV8080                          SUPERSEDED SURVEY CONTROL
 HV8080
 HV8080  NGVD 29 (11/26/84)   33.432  (m)          109.68   (f) ADJUSTED    1 1
 HV8080
 HV8080.Superseded values are not recommended for survey control.
 HV8080
 HV8080.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8080.See file dsdata.pdf to determine how the superseded data were derived.
 HV8080
 HV8080_MARKER: I = METAL ROD
 HV8080_SETTING: 59 = STAINLESS STEEL ROD IN SLEEVE (10 FT.+)
 HV8080_STAMPING: C 8 1984
 HV8080_MARK LOGO: NGS
 HV8080_PROJECTION: FLUSH
 HV8080_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 HV8080+STABILITY: POSITION/ELEVATION WELL
 HV8080_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV8080+SATELLITE: SATELLITE OBSERVATIONS - March 30, 1990
 HV8080_ROD/PIPE-DEPTH: 11.6 meters
 HV8080_SLEEVE-DEPTH  : 6.10 meters
 HV8080
 HV8080  HISTORY     - Date     Condition        Report By
 HV8080  HISTORY     - 1984     MONUMENTED       NGS
 HV8080  HISTORY     - 19900330 GOOD             NGS
 HV8080
 HV8080                          STATION DESCRIPTION
 HV8080
 HV8080'DESCRIBED BY NATIONAL GEODETIC SURVEY 1984
 HV8080'000
 HV8080'THE MARK IS ABOVE LEVEL WITH LAWN.
 HV8080'IN WASHINGTON DC, ON THE GROUNDS OF THE GEORGETOWN UNIVERSITY AND AT
 HV8080'THE NORTH SIDE OF A SMALL CEMETERY, 2.28 METERS (7.5 FEET) NORTH OF A
 HV8080'SINGLE CHAIN-TYPE FENCE AROUND THE CEMETERY, 4.9 METERS (16.1 FEET)
 HV8080'SOUTH OF THE SOUTH FACE OF THE SECOND BRICK COLUMN EAST OF THE WEST
 HV8080'END OF THE INTERNATIONAL CULTURE CENTER BUILDING, AND 1.0 METER (3.4
 HV8080'FEET) EAST OF THE EAST EDGE OF THE CONCRETE SLAB AT THE SOUTH ENTRANCE
 HV8080'TO THE BUILDING.
 HV8080
 HV8080                          STATION RECOVERY (1990)
 HV8080
 HV8080'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990
 HV8080'IN WASHINGTON DC, AT GEORGETOWN UNIVERSITY, NEAR THE MIDPOINT BETWEEN
 HV8080'THE INTERCULTURAL BUILDING AND A CEMETERY, 27.0 M (88.58 FT) EAST OF
 HV8080'THE CENTER OF A STREET, 19.5 M (63.98 FT) EAST OF THE SOUTHWEST
 HV8080'CORNER OF THE BUILDING, 11.3 M (37.07 FT) WEST OF THE CENTER OF A
 HV8080'24-INCH MANHOLE COVER, 10.5 M (34.45 FT) SOUTH OF THE SOUTH FACE OF
 HV8080'THE BUILDING, 2.2 M (7.22 FT) NORTH OF THE NORTH FENCE AROUND THE
 HV8080'CEMETERY, AND 1.0 M (3.28 FT) EAST OF THE EAST EDGE OF A CONCRETE
 HV8080'PAD.  NOTE--ACCESS TO THE DATUM POINT IS THROUGH A 5-INCH LOGO CAP.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4647 ***********************************************************************
 HV4647  DESIGNATION -  CABLE
 HV4647  PID         -  HV4647
 HV4647  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4647  COUNTRY     -  US
 HV4647  USGS QUAD   -  ALEXANDRIA (2019)
 HV4647
 HV4647                         *CURRENT SURVEY CONTROL
 HV4647  ______________________________________________________________________
 HV4647* NAD 83(1993) POSITION- 38 48 55.26860(N) 077 01 43.77517(W)   ADJUSTED
 HV4647* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV4647  ______________________________________________________________________
 HV4647  GEOID HEIGHT    -        -32.225 (meters)                     GEOID18
 HV4647  LAPLACE CORR    -         -3.02  (seconds)                    DEFLEC18
 HV4647  HORZ ORDER      -  SECOND
 HV4647
 HV4647.The horizontal coordinates were established by classical geodetic methods
 HV4647.and adjusted by the National Geodetic Survey in November 1994.
 HV4647
 HV4647.The orthometric height was scaled from a topographic map.
 HV4647
 HV4647.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4647.GEOID18 height accuracy estimate available here.
 HV4647
 HV4647.Click photographs - Photos may exist for this station.
 HV4647
 HV4647.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4647
 HV4647. The following values were computed from the NAD 83(1993) position.
 HV4647
 HV4647;                    North         East     Units Scale Factor Converg.
 HV4647;SPC MD       -   127,509.201   397,496.516   MT  0.99995040   -0 01 05.1
 HV4647;SPC MD       -   418,336.44  1,304,119.82   sFT  0.99995040   -0 01 05.1
 HV4647;SPC VA N     - 2,128,527.329 3,627,761.745   MT  0.99995433   +0 55 05.5
 HV4647;SPC VA N     - 6,983,343.41 11,902,081.66   sFT  0.99995433   +0 55 05.5
 HV4647;UTM  18      - 4,298,241.592   323,856.695   MT  0.99998207   -1 16 19.3
 HV4647
 HV4647!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4647!SPC MD       -   1.00000494  x   0.99995040  =   0.99995534
 HV4647!SPC VA N     -   1.00000494  x   0.99995433  =   0.99995927
 HV4647!UTM  18      -   1.00000494  x   0.99998207  =   0.99998701
 HV4647
 HV4647:                Primary Azimuth Mark                     Grid Az
 HV4647:SPC MD       -  PILGRIM 2                                171 04 41.7
 HV4647:SPC VA N     -  PILGRIM 2                                170 08 31.1
 HV4647:UTM  18      -  PILGRIM 2                                172 19 55.9
 HV4647
 HV4647_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2385698241(NAD 83)
 HV4647
 HV4647|---------------------------------------------------------------------|
 HV4647| PID    Reference Object                     Distance      Geod. Az  |
 HV4647|                                                           dddmmss.s |
 HV4647| HV2052 CABLE RM 2                            2.440 METERS 15032     |
 HV4647| DC6763 CABLE RM 1                           12.118 METERS 15405     |
 HV4647| HV4686 PILGRIM 2                           APPROX. 1.5 KM 1710336.6 |
 HV4647| HV4687 RACE COURSE AIR BCN PYRAMID         APPROX. 1.5 KM 1752857.5 |
 HV4647| HV4691 REAR RNG POLE CROSS CHAN RNG        APPROX. 0.8 KM 1965653.8 |
 HV4647| HV4658 FRONT RNG POLE CROSS CHAN RNG       APPROX. 0.8 KM 1990139.6 |
 HV4647|---------------------------------------------------------------------|
 HV4647
 HV4647                          SUPERSEDED SURVEY CONTROL
 HV4647
 HV4647  NAD 83(1991)-  38 48 55.26692(N)    077 01 43.77659(W) AD(       ) 2
 HV4647  NAD 83(1986)-  38 48 55.26685(N)    077 01 43.78824(W) AD(       ) 2
 HV4647  NAD 27      -  38 48 54.85900(N)    077 01 44.86800(W) AD(       ) 2
 HV4647
 HV4647.Superseded values are not recommended for survey control.
 HV4647
 HV4647.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4647.See file dsdata.pdf to determine how the superseded data were derived.
 HV4647
 HV4647_MARKER: DS = TRIANGULATION STATION DISK
 HV4647_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV4647_MARK LOGO: CGS
 HV4647_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV4647+STABILITY: SURFACE MOTION
 HV4647
 HV4647  HISTORY     - Date     Condition        Report By
 HV4647  HISTORY     - 1929     MONUMENTED       CGS
 HV4647  HISTORY     - 1931     GOOD             CGS
 HV4647  HISTORY     - 1938     GOOD             CGS
 HV4647
 HV4647                          STATION DESCRIPTION
 HV4647
 HV4647'DESCRIBED BY COAST AND GEODETIC SURVEY 1929 (FLP)
 HV4647'STATION IS ON THE N SHORE OF THE POTOMAC RIVER NEAR ALEXANDRIA,
 HV4647'VIRGINIA, ON MARBERRY POINT WHICH IS THE POINT TO THE NORTHWARD
 HV4647'OF OXON CREEK.  THE CABLE CROSSING IS AT THIS POINT.  THE
 HV4647'STATION IS 21 FEET FROM THE OUTER END OF THE POINT, 12 FEET
 HV4647'FROM THE S SHORE, AND 15 FEET FROM THE N SHORE.  IT IS 4 FEET
 HV4647'S OF THE S RAIL OF THE RAILROAD TRACK AND 4 FEET N OF THE
 HV4647'IRON STRUCTURE THAT IS AT THE END OF THE ELECTRIC LINE THAT
 HV4647'GOES INTO THE CABLE AT THIS POINT.
 HV4647'
 HV4647'SURFACE, UNDERGROUND, AND REFERENCE MARKS ARE STANDARD
 HV4647'BRONZE DISKS SET IN CONCRETE.
 HV4647'
 HV4647'REFERENCE MARK NO. 1 IS DIRECTLY INSHORE FROM THE STATION.
 HV4647'
 HV4647'REFERENCE MARK NO. 2 IS SET IN THE TOP OF A MASONRY PIER 3 FEET
 HV4647'SQUARE AND PROJECTING 3 FEET FROM THE TOP OF THE GROUND.
 HV4647'
 HV4647'HEIGHT OF TELESCOPE ABOVE STATION MARK - 4.0 METERS.
 HV4647
 HV4647                          STATION RECOVERY (1931)
 HV4647
 HV4647'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1931 (JPL)
 HV4647'STATION RECOVERED AS DESCRIBED.  DESCRIPTION ADEQUATE.
 HV4647
 HV4647                          STATION RECOVERY (1938)
 HV4647
 HV4647'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4647'STATION AND REFERENCE MARKS RECOVERED.  STATION IS ON THE OUTER
 HV4647'END OF MARBURY POINT, IN THE EXTENSION OF THE CENTER LINE OF
 HV4647'THE ROAD THAT LEADS DOWN TO THE POINT, AND 2.8 METERS INSHORE FROM
 HV4647'THE EDGE OF THE VEGETATION (WHICH FORMS THE APPROXIMATE
 HV4647'HIGH-WATER LINE) AT THE END OF THE POINT.
 HV4647'
 HV4647'MARK IS 52.4 METERS SW OF THE CENTER OF THE OUTER END OF AN
 HV4647'OLD PIER WHICH EXTENDS A VERY SHORT DISTANCE OFFSHORE ON THE
 HV4647'N SIDE OF THE POINT ABOUT 53 METERS E OF END OF POINT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2052 ***********************************************************************
 HV2052  DESIGNATION -  CABLE RM 2
 HV2052  PID         -  HV2052
 HV2052  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2052  COUNTRY     -  US
 HV2052  USGS QUAD   -  ALEXANDRIA (2019)
 HV2052
 HV2052                         *CURRENT SURVEY CONTROL
 HV2052  ______________________________________________________________________
 HV2052* NAD 83(1986) POSITION- 38 48 55.20   (N) 077 01 43.73   (W)   HD_HELD1
 HV2052* NAVD 88 ORTHO HEIGHT -     1.08  (+/-2cm)        3.5   (feet) VERTCON3
 HV2052  ______________________________________________________________________
 HV2052  GEOID HEIGHT    -        -32.225 (meters)                     GEOID18
 HV2052  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV2052
 HV2052.The horizontal coordinates were determined by differentially corrected
 HV2052.hand held GPS observations or other comparable positioning techniques
 HV2052.and have an estimated accuracy of +/- 3 meters.
 HV2052
 HV2052.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV2052.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV2052
 HV2052.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2052.GEOID18 height accuracy estimate available here.
 HV2052
 HV2052.The vertical order pertains to the NGVD 29 superseded value.
 HV2052
 HV2052.Click photographs - Photos may exist for this station.
 HV2052
 HV2052
 HV2052_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2385798239(NAD 83)
 HV2052
 HV2052                          SUPERSEDED SURVEY CONTROL
 HV2052
 HV2052  NGVD 29 (11/26/84)    1.336  (m)            4.38   (f) ADJUSTED    1 2
 HV2052
 HV2052.Superseded values are not recommended for survey control.
 HV2052
 HV2052.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2052.See file dsdata.pdf to determine how the superseded data were derived.
 HV2052
 HV2052_MARKER: DR = REFERENCE MARK DISK
 HV2052_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV2052_SP_SET: PIER
 HV2052_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV2052
 HV2052  HISTORY     - Date     Condition        Report By
 HV2052  HISTORY     - 1929     MONUMENTED       CGS
 HV2052  HISTORY     - 1931     GOOD             PBPP
 HV2052
 HV2052                          STATION DESCRIPTION
 HV2052
 HV2052'DESCRIBED BY PUB BLDGS AND PARKS 1931
 HV2052'IN WASHINGTON.
 HV2052'IN SOUTHEAST WASHINGTON, ABOUT 1/2 MILE SOUTH OF BELLEVUE, ON
 HV2052'POTOMAC RIVER, AT AN ABANDONED BALTIMORE AND OHIO RAILROAD
 HV2052'FERRY AT MARBURY POINT, SOUTH OF THE ROAD LEADING TO THE POINT,
 HV2052'7.5 FEET SOUTH OF TRIANGULATION STATION CABLE, AND IN THE TOP OF
 HV2052'AN OLD MASONRY PIER 3 FEET SQUARE AND PROJECTING 3 FEET ABOVE
 HV2052'THE GROUND.  A STANDARD REFERENCE-MARK DISK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7564 ***********************************************************************
 HV7564  DESIGNATION -  CANNON USE 1923
 HV7564  PID         -  HV7564
 HV7564  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7564  COUNTRY     -  US
 HV7564  USGS QUAD   -  ANACOSTIA (2016)
 HV7564
 HV7564                         *CURRENT SURVEY CONTROL
 HV7564  ______________________________________________________________________
 HV7564* NAD 83(1993) POSITION- 38 52 21.99755(N) 076 59 56.23971(W)   ADJUSTED
 HV7564* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV7564  ______________________________________________________________________
 HV7564  GEOID HEIGHT    -        -32.178 (meters)                     GEOID18
 HV7564  LAPLACE CORR    -         -3.15  (seconds)                    DEFLEC18
 HV7564  HORZ ORDER      -  THIRD
 HV7564
 HV7564.The horizontal coordinates were established by classical geodetic methods
 HV7564.and adjusted by the National Geodetic Survey in November 1994.
 HV7564
 HV7564.The orthometric height was scaled from a topographic map.
 HV7564
 HV7564.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7564.GEOID18 height accuracy estimate available here.
 HV7564
 HV7564.Click photographs - Photos may exist for this station.
 HV7564
 HV7564.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7564
 HV7564. The following values were computed from the NAD 83(1993) position.
 HV7564
 HV7564;                    North         East     Units Scale Factor Converg.
 HV7564;SPC MD       -   133,883.349   400,090.641   MT  0.99994985   +0 00 02.4
 HV7564;SPC MD       -   439,248.95  1,312,630.71   sFT  0.99994985   +0 00 02.4
 HV7564;SPC VA N     - 2,134,943.052 3,630,251.388   MT  0.99995828   +0 56 12.6
 HV7564;SPC VA N     - 7,004,392.33 11,910,249.76   sFT  0.99995828   +0 56 12.6
 HV7564;UTM  18      - 4,304,557.573   326,589.845   MT  0.99997030   -1 15 17.4
 HV7564
 HV7564!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7564!SPC MD       -   1.00000493  x   0.99994985  =   0.99995478
 HV7564!SPC VA N     -   1.00000493  x   0.99995828  =   0.99996321
 HV7564!UTM  18      -   1.00000493  x   0.99997030  =   0.99997523
 HV7564
 HV7564:                Primary Azimuth Mark                     Grid Az
 HV7564:SPC MD       -  STICKFOOT USE 1923                       159 12 18.3
 HV7564:SPC VA N     -  STICKFOOT USE 1923                       158 16 08.1
 HV7564:UTM  18      -  STICKFOOT USE 1923                       160 27 38.1
 HV7564
 HV7564_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2658904557(NAD 83)
 HV7564
 HV7564|---------------------------------------------------------------------|
 HV7564| PID    Reference Object                     Distance      Geod. Az  |
 HV7564|                                                           dddmmss.s |
 HV7564| HV7568 SLIP USE 1923                       413.241 METERS 1072514.1 |
 HV7564| HV7566 STICKFOOT USE 1923                  469.660 METERS 1591220.7 |
 HV7564| HV4722 PUMP USE 1923                       427.099 METERS 2665624.5 |
 HV7564|---------------------------------------------------------------------|
 HV7564
 HV7564                          SUPERSEDED SURVEY CONTROL
 HV7564
 HV7564  NAD 83(1991)-  38 52 21.99615(N)    076 59 56.24095(W) AD(       ) 3
 HV7564  NAD 83(1986)-  38 52 21.99564(N)    076 59 56.25205(W) AD(       ) 3
 HV7564  NAD 27      -  38 52 21.59300(N)    076 59 57.33800(W) AD(       ) 3
 HV7564
 HV7564.Superseded values are not recommended for survey control.
 HV7564
 HV7564.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7564.See file dsdata.pdf to determine how the superseded data were derived.
 HV7564
 HV7564
 HV7564  HISTORY     - Date     Condition        Report By
 HV7564  HISTORY     - 1923     MONUMENTED       CGS
 HV7564  HISTORY     - 1958     MARK NOT FOUND   CGS
 HV7564
 HV7564                          STATION DESCRIPTION
 HV7564
 HV7564'DESCRIBED BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7564'A THOROUGH SEARCH WAS MADE ALONG THE SEA WALL FOR THIS
 HV7564'UNDESCRIBED STATION WITHOUT RESULTS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9318 ***********************************************************************
 HV9318  DESIGNATION -  CAP 1
 HV9318  PID         -  HV9318
 HV9318  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9318  COUNTRY     -  US
 HV9318  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9318
 HV9318                         *CURRENT SURVEY CONTROL
 HV9318  ______________________________________________________________________
 HV9318* NAD 83(1993) POSITION- 38 53 23.96342(N) 077 00 31.39266(W)   ADJUSTED
 HV9318* NAVD 88 ORTHO HEIGHT -    27.4   (meters)       90.    (feet) VERT ANG
 HV9318  ______________________________________________________________________
 HV9318  GEOID HEIGHT    -        -32.128 (meters)                     GEOID18
 HV9318  LAPLACE CORR    -         -3.30  (seconds)                    DEFLEC18
 HV9318  HORZ ORDER      -  THIRD
 HV9318
 HV9318.The horizontal coordinates were established by classical geodetic methods
 HV9318.and adjusted by the National Geodetic Survey in November 1994.
 HV9318
 HV9318.The orthometric height was determined by vertical angle observations.
 HV9318
 HV9318.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9318.GEOID18 height accuracy estimate available here.
 HV9318
 HV9318.Click photographs - Photos may exist for this station.
 HV9318
 HV9318.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9318
 HV9318. The following values were computed from the NAD 83(1993) position.
 HV9318
 HV9318;                    North         East     Units Scale Factor Converg.
 HV9318;SPC MD       -   135,794.130   399,243.471   MT  0.99994988   -0 00 19.7
 HV9318;SPC MD       -   445,517.91  1,309,851.29   sFT  0.99994988   -0 00 19.7
 HV9318;SPC VA N     - 2,136,839.754 3,629,373.103   MT  0.99995966   +0 55 50.6
 HV9318;SPC VA N     - 7,010,615.09 11,907,368.26   sFT  0.99995966   +0 55 50.6
 HV9318;UTM  18      - 4,306,486.504   325,784.736   MT  0.99997375   -1 15 41.2
 HV9318
 HV9318!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9318!SPC MD       -   1.00000075  x   0.99994988  =   0.99995063
 HV9318!SPC VA N     -   1.00000075  x   0.99995966  =   0.99996041
 HV9318!UTM  18      -   1.00000075  x   0.99997375  =   0.99997450
 HV9318
 HV9318_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2578406486(NAD 83)
 HV9318
 HV9318                          SUPERSEDED SURVEY CONTROL
 HV9318
 HV9318  NAD 83(1991)-  38 53 23.96407(N)    077 00 31.39268(W) AD(       ) 3
 HV9318
 HV9318.Superseded values are not recommended for survey control.
 HV9318
 HV9318.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9318.See file dsdata.pdf to determine how the superseded data were derived.
 HV9318
 HV9318_MARKER: Z = SEE DESCRIPTION
 HV9318_SETTING: 0 = UNSPECIFIED SETTING
 HV9318_MARK LOGO: NGS
 HV9318_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9318_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9318_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9318+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9318
 HV9318  HISTORY     - Date     Condition        Report By
 HV9318  HISTORY     - 1992     MONUMENTED       NGS
 HV9318  HISTORY     - 20100314 GOOD             GEOCAC
 HV9318
 HV9318                          STATION DESCRIPTION
 HV9318
 HV9318'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9318'STATION IS LOCATED JUST OUTSIDE THE FIRST FLOOR LAW LIBRARY DOOR
 HV9318'ENTRANCE OF THE CAPITOL, SENATE SIDE.  MARK IS THE INTERSECTION OF
 HV9318'TILES, IN THE CENTER OF THE GROUT SEAMS.  1.05 METERS (3.44 FT) EAST
 HV9318'SOUTHEAST OF THE NORTHEAST CORNER OF THE STEP OUTSIDE THE DOOR. 2.30
 HV9318'METERS (7.55 FT) NORTH NORTHEAST OF THE SOUTHEAST CORNER OF THE SAME
 HV9318'STEP.  1.62 METERS (5.31 FT) WEST OF THE SOUTHWEST CORNER OF THE
 HV9318'SECOND PILLAR FROM THE NORTH.  2.29 METERS (7.51 FT) NORTHWEST OF THE
 HV9318'NORTHWEST CORNER OF THE THIRD PILLAR FROM THE NORTH.
 HV9318
 HV9318                          STATION RECOVERY (2010)
 HV9318
 HV9318'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 HV9318'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9319 ***********************************************************************
 HV9319  DESIGNATION -  CAP 10
 HV9319  PID         -  HV9319
 HV9319  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9319  COUNTRY     -  US
 HV9319  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9319
 HV9319                         *CURRENT SURVEY CONTROL
 HV9319  ______________________________________________________________________
 HV9319* NAD 83(1993) POSITION- 38 53 23.87684(N) 077 00 31.88347(W)   ADJUSTED
 HV9319* NAVD 88 ORTHO HEIGHT -    23.9   (meters)       78.    (feet) VERT ANG
 HV9319  ______________________________________________________________________
 HV9319  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 HV9319  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9319  HORZ ORDER      -  THIRD
 HV9319
 HV9319.The horizontal coordinates were established by classical geodetic methods
 HV9319.and adjusted by the National Geodetic Survey in November 1994.
 HV9319
 HV9319.The orthometric height was determined by vertical angle observations.
 HV9319
 HV9319.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9319.GEOID18 height accuracy estimate available here.
 HV9319
 HV9319.Click photographs - Photos may exist for this station.
 HV9319
 HV9319.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9319
 HV9319. The following values were computed from the NAD 83(1993) position.
 HV9319
 HV9319;                    North         East     Units Scale Factor Converg.
 HV9319;SPC MD       -   135,791.462   399,231.643   MT  0.99994988   -0 00 20.0
 HV9319;SPC MD       -   445,509.15  1,309,812.48   sFT  0.99994988   -0 00 20.0
 HV9319;SPC VA N     - 2,136,836.893 3,629,361.320   MT  0.99995966   +0 55 50.3
 HV9319;SPC VA N     - 7,010,605.71 11,907,329.60   sFT  0.99995966   +0 55 50.3
 HV9319;UTM  18      - 4,306,484.095   325,772.852   MT  0.99997380   -1 15 41.5
 HV9319
 HV9319!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9319!SPC MD       -   1.00000129  x   0.99994988  =   0.99995117
 HV9319!SPC VA N     -   1.00000129  x   0.99995966  =   0.99996095
 HV9319!UTM  18      -   1.00000129  x   0.99997380  =   0.99997509
 HV9319
 HV9319_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577206484(NAD 83)
 HV9319
 HV9319                          SUPERSEDED SURVEY CONTROL
 HV9319
 HV9319  NAD 83(1991)-  38 53 23.87751(N)    077 00 31.88346(W) AD(       ) 3
 HV9319
 HV9319.Superseded values are not recommended for survey control.
 HV9319
 HV9319.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9319.See file dsdata.pdf to determine how the superseded data were derived.
 HV9319
 HV9319_MARKER: DD = SURVEY DISK
 HV9319_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV9319_SP_SET: DRILL HOLE IN FLOOR
 HV9319_STAMPING: CAP 10
 HV9319_MARK LOGO: NONE
 HV9319_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9319_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9319
 HV9319  HISTORY     - Date     Condition        Report By
 HV9319  HISTORY     - 1992     MONUMENTED       NGS
 HV9319
 HV9319                          STATION DESCRIPTION
 HV9319
 HV9319'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9319'STATION IS LOCATED IN A TELEPHONE SWITCH ROOM OFF THE NORTH-SOUTH
 HV9319'BASEMENT HALLWAY OF THE CAPITOL ON THE EAST SIDE, SENATE WING, JUST
 HV9319'SOUTH OF THE STAIRWAY LEADING TO THE LAW LIBRARY ENTRANCE ON THE
 HV9319'FIRST FLOOR.  STATION IS MARKED BY A 30 MILLIMETER BRASS DISK WITH A
 HV9319'CONE SHAPED CENTER MARK SET IN THE FLOOR 0.53 METER (1.74 FT) EAST OF
 HV9319'THE KICKBOARD ALONG THE WEST WALL, 1.17 METERS (3.84 FT) WEST OF THE
 HV9319'EAST WALL AND 1.97 METERS (6.46 FT) SOUTHWEST OF THE SOUTH EDGE OF
 HV9319'THE DOOR.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9320 ***********************************************************************
 HV9320  DESIGNATION -  CAP 11
 HV9320  PID         -  HV9320
 HV9320  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9320  COUNTRY     -  US
 HV9320  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9320
 HV9320                         *CURRENT SURVEY CONTROL
 HV9320  ______________________________________________________________________
 HV9320* NAD 83(1993) POSITION- 38 53 24.04894(N) 077 00 31.88701(W)   ADJUSTED
 HV9320* NAVD 88 ORTHO HEIGHT -    23.9   (meters)       78.    (feet) VERT ANG
 HV9320  ______________________________________________________________________
 HV9320  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 HV9320  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9320  HORZ ORDER      -  THIRD
 HV9320
 HV9320.The horizontal coordinates were established by classical geodetic methods
 HV9320.and adjusted by the National Geodetic Survey in November 1994.
 HV9320
 HV9320.The orthometric height was determined by vertical angle observations.
 HV9320
 HV9320.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9320.GEOID18 height accuracy estimate available here.
 HV9320
 HV9320.Click photographs - Photos may exist for this station.
 HV9320
 HV9320.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9320
 HV9320. The following values were computed from the NAD 83(1993) position.
 HV9320
 HV9320;                    North         East     Units Scale Factor Converg.
 HV9320;SPC MD       -   135,796.769   399,231.558   MT  0.99994988   -0 00 20.0
 HV9320;SPC MD       -   445,526.57  1,309,812.20   sFT  0.99994988   -0 00 20.0
 HV9320;SPC VA N     - 2,136,842.197 3,629,361.149   MT  0.99995967   +0 55 50.3
 HV9320;SPC VA N     - 7,010,623.11 11,907,329.04   sFT  0.99995967   +0 55 50.3
 HV9320;UTM  18      - 4,306,489.402   325,772.883   MT  0.99997380   -1 15 41.5
 HV9320
 HV9320!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9320!SPC MD       -   1.00000129  x   0.99994988  =   0.99995117
 HV9320!SPC VA N     -   1.00000129  x   0.99995967  =   0.99996096
 HV9320!UTM  18      -   1.00000129  x   0.99997380  =   0.99997509
 HV9320
 HV9320_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577206489(NAD 83)
 HV9320
 HV9320                          SUPERSEDED SURVEY CONTROL
 HV9320
 HV9320  NAD 83(1991)-  38 53 24.04961(N)    077 00 31.88700(W) AD(       ) 3
 HV9320
 HV9320.Superseded values are not recommended for survey control.
 HV9320
 HV9320.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9320.See file dsdata.pdf to determine how the superseded data were derived.
 HV9320
 HV9320_MARKER: DD = SURVEY DISK
 HV9320_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV9320_SP_SET: DRILL HOLE IN FLOOR
 HV9320_STAMPING: CAP 11
 HV9320_MARK LOGO: NONE
 HV9320_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9320_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9320_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9320+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9320
 HV9320  HISTORY     - Date     Condition        Report By
 HV9320  HISTORY     - 1992     MONUMENTED       NGS
 HV9320
 HV9320                          STATION DESCRIPTION
 HV9320
 HV9320'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9320'STATION IS LOCATED IN A TELEPHONE SWITCH ROOM OFF THE NORTH-SOUTH
 HV9320'BASEMENT HALLWAY OF THE CAPITOL ON THE EAST SIDE, SENATE WING, JUST
 HV9320'SOUTH OF THE STAIRWAY LEADING TO THE LAW LIBRARY ENTRANCE ON THE
 HV9320'FIRST FLOOR.  STATION IS MARKED BY A 30 MILLIMETER BRASS DISK WITH A
 HV9320'CONE SHAPED CENTER MARK SET IN THE FLOOR 0.73 METER (2.40 FT) EAST OF
 HV9320'THE WEST WALL, 0.96 METER (3.15 FT) WEST OF THE EAST WALL, AND 1.26
 HV9320'METER (4.13 FT) SOUTH OF THE NORTH WALL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9321 ***********************************************************************
 HV9321  DESIGNATION -  CAP 12
 HV9321  PID         -  HV9321
 HV9321  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9321  COUNTRY     -  US
 HV9321  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9321
 HV9321                         *CURRENT SURVEY CONTROL
 HV9321  ______________________________________________________________________
 HV9321* NAD 83(1993) POSITION- 38 53 22.39210(N) 077 00 31.79985(W)   ADJUSTED
 HV9321* NAVD 88 ORTHO HEIGHT -    23.9   (meters)       78.    (feet) VERT ANG
 HV9321  ______________________________________________________________________
 HV9321  GEOID HEIGHT    -        -32.128 (meters)                     GEOID18
 HV9321  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9321  HORZ ORDER      -  THIRD
 HV9321
 HV9321.The horizontal coordinates were established by classical geodetic methods
 HV9321.and adjusted by the National Geodetic Survey in November 1994.
 HV9321
 HV9321.The orthometric height was determined by vertical angle observations.
 HV9321
 HV9321.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9321.GEOID18 height accuracy estimate available here.
 HV9321
 HV9321.Click photographs - Photos may exist for this station.
 HV9321
 HV9321.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9321
 HV9321. The following values were computed from the NAD 83(1993) position.
 HV9321
 HV9321;                    North         East     Units Scale Factor Converg.
 HV9321;SPC MD       -   135,745.679   399,233.654   MT  0.99994988   -0 00 20.0
 HV9321;SPC MD       -   445,358.95  1,309,819.08   sFT  0.99994988   -0 00 20.0
 HV9321;SPC VA N     - 2,136,791.148 3,629,364.079   MT  0.99995963   +0 55 50.4
 HV9321;SPC VA N     - 7,010,455.62 11,907,338.65   sFT  0.99995963   +0 55 50.4
 HV9321;UTM  18      - 4,306,438.278   325,773.859   MT  0.99997379   -1 15 41.4
 HV9321
 HV9321!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9321!SPC MD       -   1.00000129  x   0.99994988  =   0.99995117
 HV9321!SPC VA N     -   1.00000129  x   0.99995963  =   0.99996092
 HV9321!UTM  18      -   1.00000129  x   0.99997379  =   0.99997508
 HV9321
 HV9321_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577306438(NAD 83)
 HV9321
 HV9321                          SUPERSEDED SURVEY CONTROL
 HV9321
 HV9321  NAD 83(1991)-  38 53 22.39277(N)    077 00 31.79989(W) AD(       ) 3
 HV9321
 HV9321.Superseded values are not recommended for survey control.
 HV9321
 HV9321.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9321.See file dsdata.pdf to determine how the superseded data were derived.
 HV9321
 HV9321_MARKER: DD = SURVEY DISK
 HV9321_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV9321_SP_SET: DRILL HOLE IN FLOOR
 HV9321_STAMPING: CAP 12
 HV9321_MARK LOGO: NONE
 HV9321_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9321_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9321_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9321+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9321
 HV9321  HISTORY     - Date     Condition        Report By
 HV9321  HISTORY     - 1992     MONUMENTED       NGS
 HV9321
 HV9321                          STATION DESCRIPTION
 HV9321
 HV9321'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9321'STATION IS LOCATED IN THE NORTH-SOUTH BASEMENT HALLWAY OF THE CAPITOL
 HV9321'ON THE EAST SIDE, HOUSE WING, OPPOSITE THE ENTRANCE TO ROOM HB-4,
 HV9321'LIBRARY OF CONGRESS CAPITOL STATION, AND JUST SOUTH OF THE STAIRWAY
 HV9321'LEADING TO THE DOCUMENT ENTRANCE ON THE FIRST FLOOR.  STATION IS
 HV9321'MARKED BY A 30 MILLIMETER BRASS DISK WITH A CONE SHAPED CENTER MARK
 HV9321'SET IN THE FLOOR OF THE HALLWAY, 1.64 METERS (5.38 FT) WEST OF THE
 HV9321'DOOR TO ROOM HB-4 AND 0.74 METER (2.43 FT) EAST OF THE WEST WALL OF
 HV9321'THE HALLWAY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9322 ***********************************************************************
 HV9322  DESIGNATION -  CAP 13
 HV9322  PID         -  HV9322
 HV9322  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9322  COUNTRY     -  US
 HV9322  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9322
 HV9322                         *CURRENT SURVEY CONTROL
 HV9322  ______________________________________________________________________
 HV9322* NAD 83(1993) POSITION- 38 53 22.50495(N) 077 00 31.69908(W)   ADJUSTED
 HV9322* NAVD 88 ORTHO HEIGHT -    24.0   (meters)       79.    (feet) VERT ANG
 HV9322  ______________________________________________________________________
 HV9322  GEOID HEIGHT    -        -32.128 (meters)                     GEOID18
 HV9322  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9322  HORZ ORDER      -  THIRD
 HV9322
 HV9322.The horizontal coordinates were established by classical geodetic methods
 HV9322.and adjusted by the National Geodetic Survey in November 1994.
 HV9322
 HV9322.The orthometric height was determined by vertical angle observations.
 HV9322
 HV9322.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9322.GEOID18 height accuracy estimate available here.
 HV9322
 HV9322.Click photographs - Photos may exist for this station.
 HV9322
 HV9322.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9322
 HV9322. The following values were computed from the NAD 83(1993) position.
 HV9322
 HV9322;                    North         East     Units Scale Factor Converg.
 HV9322;SPC MD       -   135,749.158   399,236.083   MT  0.99994988   -0 00 19.9
 HV9322;SPC MD       -   445,370.36  1,309,827.05   sFT  0.99994988   -0 00 19.9
 HV9322;SPC VA N     - 2,136,794.667 3,629,366.450   MT  0.99995963   +0 55 50.5
 HV9322;SPC VA N     - 7,010,467.17 11,907,346.43   sFT  0.99995963   +0 55 50.5
 HV9322;UTM  18      - 4,306,441.703   325,776.363   MT  0.99997378   -1 15 41.4
 HV9322
 HV9322!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9322!SPC MD       -   1.00000128  x   0.99994988  =   0.99995116
 HV9322!SPC VA N     -   1.00000128  x   0.99995963  =   0.99996091
 HV9322!UTM  18      -   1.00000128  x   0.99997378  =   0.99997506
 HV9322
 HV9322_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577606441(NAD 83)
 HV9322
 HV9322                          SUPERSEDED SURVEY CONTROL
 HV9322
 HV9322  NAD 83(1991)-  38 53 22.50561(N)    077 00 31.69912(W) AD(       ) 3
 HV9322
 HV9322.Superseded values are not recommended for survey control.
 HV9322
 HV9322.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9322.See file dsdata.pdf to determine how the superseded data were derived.
 HV9322
 HV9322_MARKER: Z = SEE DESCRIPTION
 HV9322_SETTING: 0 = UNSPECIFIED SETTING
 HV9322_MARK LOGO: NGS
 HV9322_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9322_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9322_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9322+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9322
 HV9322  HISTORY     - Date     Condition        Report By
 HV9322  HISTORY     - 1992     MONUMENTED       NGS
 HV9322
 HV9322                          STATION DESCRIPTION
 HV9322
 HV9322'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9322'STATION IS LOCATED ON THE BASEMENT LANDING OF THE STAIRS SOUTH OF THE
 HV9322'SECURITY CHECK AREA INSIDE THE DOCUMENT DOOR ENTRANCE, FIRST FLOOR,
 HV9322'HOUSE WING OF THE CAPITOL AND JUST NORTHEAST OF CAP 12.  STATION IS
 HV9322'MARKED BY A PUNCH MARK IN THE CONCRETE LANDING, 0.46 METER (1.51 FT)
 HV9322'SOUTH OF THE NORTH WALL, 0.70 METER (2.30 FT) EAST OF THE WEST WALL
 HV9322'AND 0.66 METER (2.17 FT) WEST OF THE WEST EDGE OF THE BOTTOM STEP.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9323 ***********************************************************************
 HV9323  DESIGNATION -  CAP 14
 HV9323  PID         -  HV9323
 HV9323  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9323  COUNTRY     -  US
 HV9323  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9323
 HV9323                         *CURRENT SURVEY CONTROL
 HV9323  ______________________________________________________________________
 HV9323* NAD 83(1993) POSITION- 38 53 22.48064(N) 077 00 31.51913(W)   ADJUSTED
 HV9323* NAVD 88 ORTHO HEIGHT -    26.2   (meters)       86.    (feet) VERT ANG
 HV9323  ______________________________________________________________________
 HV9323  GEOID HEIGHT    -        -32.128 (meters)                     GEOID18
 HV9323  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9323  HORZ ORDER      -  THIRD
 HV9323
 HV9323.The horizontal coordinates were established by classical geodetic methods
 HV9323.and adjusted by the National Geodetic Survey in November 1994.
 HV9323
 HV9323.The orthometric height was determined by vertical angle observations.
 HV9323
 HV9323.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9323.GEOID18 height accuracy estimate available here.
 HV9323
 HV9323.Click photographs - Photos may exist for this station.
 HV9323
 HV9323.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9323
 HV9323. The following values were computed from the NAD 83(1993) position.
 HV9323
 HV9323;                    North         East     Units Scale Factor Converg.
 HV9323;SPC MD       -   135,748.408   399,240.419   MT  0.99994988   -0 00 19.8
 HV9323;SPC MD       -   445,367.90  1,309,841.27   sFT  0.99994988   -0 00 19.8
 HV9323;SPC VA N     - 2,136,793.988 3,629,370.799   MT  0.99995963   +0 55 50.6
 HV9323;SPC VA N     - 7,010,464.94 11,907,360.70   sFT  0.99995963   +0 55 50.6
 HV9323;UTM  18      - 4,306,440.859   325,780.682   MT  0.99997376   -1 15 41.2
 HV9323
 HV9323!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9323!SPC MD       -   1.00000092  x   0.99994988  =   0.99995080
 HV9323!SPC VA N     -   1.00000092  x   0.99995963  =   0.99996055
 HV9323!UTM  18      -   1.00000092  x   0.99997376  =   0.99997468
 HV9323
 HV9323_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2578006440(NAD 83)
 HV9323
 HV9323                          SUPERSEDED SURVEY CONTROL
 HV9323
 HV9323  NAD 83(1991)-  38 53 22.48130(N)    077 00 31.51917(W) AD(       ) 3
 HV9323
 HV9323.Superseded values are not recommended for survey control.
 HV9323
 HV9323.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9323.See file dsdata.pdf to determine how the superseded data were derived.
 HV9323
 HV9323_MARKER: Z = SEE DESCRIPTION
 HV9323_SETTING: 0 = UNSPECIFIED SETTING
 HV9323_MARK LOGO: NGS
 HV9323_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9323_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9323_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9323+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9323
 HV9323  HISTORY     - Date     Condition        Report By
 HV9323  HISTORY     - 1992     MONUMENTED       NGS
 HV9323
 HV9323                          STATION DESCRIPTION
 HV9323
 HV9323'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9323'STATION IS LOCATED ON THE STAIRWAY LANDING MIDWAY BETWEEN THE FIRST
 HV9323'AND BASEMENT LEVELS OF THE CAPITOL, IN THE STAIRWELL LOCATED JUST
 HV9323'SOUTH OF THE SECURITY CHECK AREA INSIDE THE DOCUMENT DOOR ENTRANCE,
 HV9323'FIRST FLOOR HOUSE WING.  STATION IS MARKED BY A PUNCH MARK IN THE
 HV9323'CONCRETE LANDING, 1.20 METERS (3.94 FT) SOUTH OF THE NORTH WALL, 0.42
 HV9323'METER (1.38 FT) WEST OF THE EAST WALL AND 0.90 METER (2.95 FT) EAST
 HV9323'OF THE WEST EDGE OF THE LANDING.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9324 ***********************************************************************
 HV9324  DESIGNATION -  CAP 15
 HV9324  PID         -  HV9324
 HV9324  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9324  COUNTRY     -  US
 HV9324  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9324
 HV9324                         *CURRENT SURVEY CONTROL
 HV9324  ______________________________________________________________________
 HV9324* NAD 83(1993) POSITION- 38 53 22.45006(N) 077 00 31.62688(W)   ADJUSTED
 HV9324* NAVD 88 ORTHO HEIGHT -    27.6   (meters)       91.    (feet) VERT ANG
 HV9324  ______________________________________________________________________
 HV9324  GEOID HEIGHT    -        -32.128 (meters)                     GEOID18
 HV9324  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9324  HORZ ORDER      -  THIRD
 HV9324
 HV9324.The horizontal coordinates were established by classical geodetic methods
 HV9324.and adjusted by the National Geodetic Survey in November 1994.
 HV9324
 HV9324.The orthometric height was determined by vertical angle observations.
 HV9324
 HV9324.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9324.GEOID18 height accuracy estimate available here.
 HV9324
 HV9324.Click photographs - Photos may exist for this station.
 HV9324
 HV9324.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9324
 HV9324. The following values were computed from the NAD 83(1993) position.
 HV9324
 HV9324;                    North         East     Units Scale Factor Converg.
 HV9324;SPC MD       -   135,747.466   399,237.823   MT  0.99994988   -0 00 19.9
 HV9324;SPC MD       -   445,364.81  1,309,832.76   sFT  0.99994988   -0 00 19.9
 HV9324;SPC VA N     - 2,136,793.003 3,629,368.218   MT  0.99995963   +0 55 50.5
 HV9324;SPC VA N     - 7,010,461.71 11,907,352.23   sFT  0.99995963   +0 55 50.5
 HV9324;UTM  18      - 4,306,439.973   325,778.065   MT  0.99997377   -1 15 41.3
 HV9324
 HV9324!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9324!SPC MD       -   1.00000072  x   0.99994988  =   0.99995060
 HV9324!SPC VA N     -   1.00000072  x   0.99995963  =   0.99996035
 HV9324!UTM  18      -   1.00000072  x   0.99997377  =   0.99997449
 HV9324
 HV9324_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577806439(NAD 83)
 HV9324
 HV9324                          SUPERSEDED SURVEY CONTROL
 HV9324
 HV9324  NAD 83(1991)-  38 53 22.45072(N)    077 00 31.62693(W) AD(       ) 3
 HV9324
 HV9324.Superseded values are not recommended for survey control.
 HV9324
 HV9324.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9324.See file dsdata.pdf to determine how the superseded data were derived.
 HV9324
 HV9324_MARKER: Z = SEE DESCRIPTION
 HV9324_SETTING: 0 = UNSPECIFIED SETTING
 HV9324_MARK LOGO: NGS
 HV9324_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9324_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9324_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9324+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9324
 HV9324  HISTORY     - Date     Condition        Report By
 HV9324  HISTORY     - 1992     MONUMENTED       NGS
 HV9324
 HV9324                          STATION DESCRIPTION
 HV9324
 HV9324'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9324'STATION IS LOCATED AT THE TOP OF THE STAIRWAY LEADING TO THE BASEMENT
 HV9324'LEVEL OF THE CAPITOL, SOUTH OF THE SECURITY CHECK AREA INSIDE THE
 HV9324'DOCUMENT DOOR ENTRANCE ON THE FIRST FLOOR, HOUSE SIDE, ADJACENT TO
 HV9324'THE ELEVATOR.  STATION IS MARKED BY A PUNCH MARK IN THE CONCRETE
 HV9324'LANDING, 0.74 METER (2.43 FT) SOUTH OF THE NORTH WALL, 0.32 METER
 HV9324'(1.05 FT) NORTH OF THE SOUTH WALL AND 0.26 METER (0.85 FT) WEST OF
 HV9324'THE EDGE OF THE LANDING.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9325 ***********************************************************************
 HV9325  DESIGNATION -  CAP 16
 HV9325  PID         -  HV9325
 HV9325  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9325  COUNTRY     -  US
 HV9325  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9325
 HV9325                         *CURRENT SURVEY CONTROL
 HV9325  ______________________________________________________________________
 HV9325* NAD 83(1993) POSITION- 38 53 22.60165(N) 077 00 31.91719(W)   ADJUSTED
 HV9325* NAVD 88 ORTHO HEIGHT -    27.6   (meters)       91.    (feet) VERT ANG
 HV9325  ______________________________________________________________________
 HV9325  GEOID HEIGHT    -        -32.128 (meters)                     GEOID18
 HV9325  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9325  HORZ ORDER      -  THIRD
 HV9325
 HV9325.The horizontal coordinates were established by classical geodetic methods
 HV9325.and adjusted by the National Geodetic Survey in November 1994.
 HV9325
 HV9325.The orthometric height was determined by vertical angle observations.
 HV9325
 HV9325.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9325.GEOID18 height accuracy estimate available here.
 HV9325
 HV9325.Click photographs - Photos may exist for this station.
 HV9325
 HV9325.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9325
 HV9325. The following values were computed from the NAD 83(1993) position.
 HV9325
 HV9325;                    North         East     Units Scale Factor Converg.
 HV9325;SPC MD       -   135,752.141   399,230.827   MT  0.99994988   -0 00 20.0
 HV9325;SPC MD       -   445,380.15  1,309,809.80   sFT  0.99994988   -0 00 20.0
 HV9325;SPC VA N     - 2,136,797.563 3,629,361.146   MT  0.99995963   +0 55 50.3
 HV9325;SPC VA N     - 7,010,476.67 11,907,329.03   sFT  0.99995963   +0 55 50.3
 HV9325;UTM  18      - 4,306,444.800   325,771.174   MT  0.99997380   -1 15 41.5
 HV9325
 HV9325!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9325!SPC MD       -   1.00000072  x   0.99994988  =   0.99995060
 HV9325!SPC VA N     -   1.00000072  x   0.99995963  =   0.99996035
 HV9325!UTM  18      -   1.00000072  x   0.99997380  =   0.99997452
 HV9325
 HV9325_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577106444(NAD 83)
 HV9325
 HV9325                          SUPERSEDED SURVEY CONTROL
 HV9325
 HV9325  NAD 83(1991)-  38 53 22.60231(N)    077 00 31.91723(W) AD(       ) 3
 HV9325
 HV9325.Superseded values are not recommended for survey control.
 HV9325
 HV9325.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9325.See file dsdata.pdf to determine how the superseded data were derived.
 HV9325
 HV9325_MARKER: Z = SEE DESCRIPTION
 HV9325_SETTING: 0 = UNSPECIFIED SETTING
 HV9325_MARK LOGO: NGS
 HV9325_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9325_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9325_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9325+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9325
 HV9325  HISTORY     - Date     Condition        Report By
 HV9325  HISTORY     - 1992     MONUMENTED       NGS
 HV9325
 HV9325                          STATION DESCRIPTION
 HV9325
 HV9325'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9325'LOCATED IN THE AREA SOUTH OF THE SECURITY CHECK INSIDE THE FIRST FLOOR
 HV9325'DOCUMENT DOOR ENTRANCE OF THE CAPITOL ON THE HOUSE SIDE, JUST INSIDE
 HV9325'THE DOOR LEADING TO THE STAIRWELL AND ELEVATOR.  STATION IS MARKED BY
 HV9325'THE TEE INTERSECTION OF FLOOR TILES 0.38 METER (1.25 FT) EAST OF THE
 HV9325'WEST WALL, 0.58 METER (1.90 FT) SOUTH OF THE SOUTH EDGE OF THE DOOR
 HV9325'AND 1.92 METERS (6.30 FT) NORTH OF THE SOUTH WALL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9326 ***********************************************************************
 HV9326  DESIGNATION -  CAP 17
 HV9326  PID         -  HV9326
 HV9326  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9326  COUNTRY     -  US
 HV9326  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9326
 HV9326                         *CURRENT SURVEY CONTROL
 HV9326  ______________________________________________________________________
 HV9326* NAD 83(1993) POSITION- 38 53 22.74322(N) 077 00 31.69421(W)   ADJUSTED
 HV9326* NAVD 88 ORTHO HEIGHT -    27.6   (meters)       91.    (feet) VERT ANG
 HV9326  ______________________________________________________________________
 HV9326  GEOID HEIGHT    -        -32.128 (meters)                     GEOID18
 HV9326  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9326  HORZ ORDER      -  THIRD
 HV9326
 HV9326.The horizontal coordinates were established by classical geodetic methods
 HV9326.and adjusted by the National Geodetic Survey in November 1994.
 HV9326
 HV9326.The orthometric height was determined by vertical angle observations.
 HV9326
 HV9326.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9326.GEOID18 height accuracy estimate available here.
 HV9326
 HV9326.Click photographs - Photos may exist for this station.
 HV9326
 HV9326.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9326
 HV9326. The following values were computed from the NAD 83(1993) position.
 HV9326
 HV9326;                    North         East     Units Scale Factor Converg.
 HV9326;SPC MD       -   135,756.506   399,236.201   MT  0.99994988   -0 00 19.9
 HV9326;SPC MD       -   445,394.47  1,309,827.44   sFT  0.99994988   -0 00 19.9
 HV9326;SPC VA N     - 2,136,802.015 3,629,366.448   MT  0.99995964   +0 55 50.5
 HV9326;SPC VA N     - 7,010,491.28 11,907,346.42   sFT  0.99995964   +0 55 50.5
 HV9326;UTM  18      - 4,306,449.046   325,776.642   MT  0.99997378   -1 15 41.4
 HV9326
 HV9326!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9326!SPC MD       -   1.00000072  x   0.99994988  =   0.99995060
 HV9326!SPC VA N     -   1.00000072  x   0.99995964  =   0.99996036
 HV9326!UTM  18      -   1.00000072  x   0.99997378  =   0.99997450
 HV9326
 HV9326_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577606449(NAD 83)
 HV9326
 HV9326                          SUPERSEDED SURVEY CONTROL
 HV9326
 HV9326  NAD 83(1991)-  38 53 22.74388(N)    077 00 31.69425(W) AD(       ) 3
 HV9326
 HV9326.Superseded values are not recommended for survey control.
 HV9326
 HV9326.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9326.See file dsdata.pdf to determine how the superseded data were derived.
 HV9326
 HV9326_MARKER: Z = SEE DESCRIPTION
 HV9326_SETTING: 0 = UNSPECIFIED SETTING
 HV9326_MARK LOGO: NGS
 HV9326_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9326_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9326_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9326+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9326
 HV9326  HISTORY     - Date     Condition        Report By
 HV9326  HISTORY     - 1992     MONUMENTED       NGS
 HV9326
 HV9326                          STATION DESCRIPTION
 HV9326
 HV9326'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9326'LOCATED IN THE AREA OF THE FIRST FLOOR DOCUMENT DOOR ENTRANCE OF THE
 HV9326'CAPITOL, ON THE HOUSE SIDE, JUST NORTH OF THE SECURITY CHECK AREA.
 HV9326'THE STATION IS MARKED BY THE TEE INTERSECTION OF FLOOR TILES.  1.50
 HV9326'METERS (4.92 FT) SOUTHEAST OF THE NEAREST EDGE OF THE WEST ONE OF TWO
 HV9326'PILLARS, 1.50 METERS (4.92 FT) SOUTHWEST OF THE NEAREST EDGE OF THE
 HV9326'EAST ONE OF TWO PILLARS, 2.83 METERS (9.28 FT) EAST OF THE WEST EDGE
 HV9326'OF THE HALLWAY WALL AND 2.83 METERS (9.28 FT) WEST OF THE EAST EDGE
 HV9326'OF THE HALLWAY WALL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9327 ***********************************************************************
 HV9327  DESIGNATION -  CAP 18
 HV9327  PID         -  HV9327
 HV9327  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9327  COUNTRY     -  US
 HV9327  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9327
 HV9327                         *CURRENT SURVEY CONTROL
 HV9327  ______________________________________________________________________
 HV9327* NAD 83(1993) POSITION- 38 53 23.32824(N) 077 00 31.64596(W)   ADJUSTED
 HV9327* NAVD 88 ORTHO HEIGHT -    27.6   (meters)       91.    (feet) VERT ANG
 HV9327  ______________________________________________________________________
 HV9327  GEOID HEIGHT    -        -32.128 (meters)                     GEOID18
 HV9327  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9327  HORZ ORDER      -  THIRD
 HV9327
 HV9327.The horizontal coordinates were established by classical geodetic methods
 HV9327.and adjusted by the National Geodetic Survey in November 1994.
 HV9327
 HV9327.The orthometric height was determined by vertical angle observations.
 HV9327
 HV9327.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9327.GEOID18 height accuracy estimate available here.
 HV9327
 HV9327.Click photographs - Photos may exist for this station.
 HV9327
 HV9327.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9327
 HV9327. The following values were computed from the NAD 83(1993) position.
 HV9327
 HV9327;                    North         East     Units Scale Factor Converg.
 HV9327;SPC MD       -   135,774.545   399,237.365   MT  0.99994988   -0 00 19.9
 HV9327;SPC MD       -   445,453.65  1,309,831.26   sFT  0.99994988   -0 00 19.9
 HV9327;SPC VA N     - 2,136,820.071 3,629,367.318   MT  0.99995965   +0 55 50.5
 HV9327;SPC VA N     - 7,010,550.52 11,907,349.28   sFT  0.99995965   +0 55 50.5
 HV9327;UTM  18      - 4,306,467.056   325,778.202   MT  0.99997377   -1 15 41.3
 HV9327
 HV9327!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9327!SPC MD       -   1.00000071  x   0.99994988  =   0.99995059
 HV9327!SPC VA N     -   1.00000071  x   0.99995965  =   0.99996036
 HV9327!UTM  18      -   1.00000071  x   0.99997377  =   0.99997448
 HV9327
 HV9327_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577806467(NAD 83)
 HV9327
 HV9327                          SUPERSEDED SURVEY CONTROL
 HV9327
 HV9327  NAD 83(1991)-  38 53 23.32891(N)    077 00 31.64598(W) AD(       ) 3
 HV9327
 HV9327.Superseded values are not recommended for survey control.
 HV9327
 HV9327.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9327.See file dsdata.pdf to determine how the superseded data were derived.
 HV9327
 HV9327_MARKER: Z = SEE DESCRIPTION
 HV9327_SETTING: 0 = UNSPECIFIED SETTING
 HV9327_MARK LOGO: NGS
 HV9327_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9327_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9327_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9327+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9327
 HV9327  HISTORY     - Date     Condition        Report By
 HV9327  HISTORY     - 1992     MONUMENTED       NGS
 HV9327
 HV9327                          STATION DESCRIPTION
 HV9327
 HV9327'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9327'STATION IS LOCATED MIDWAY BETWEEN THE SECURITY CHECK AREAS AT THE LAW
 HV9327'LIBRARY ENTRANCE AND DOCUMENT DOOR ENTRANCE ON THE FIRST FLOOR OF THE
 HV9327'CAPITOL ON THE EAST SIDE OF THE INFORMATION AND SOUVENIER STAND.
 HV9327'STATION IS MARKED BY A CROSS INTERSECTION OF FLOOR TILES 3.25 METERS
 HV9327'(10.66 FT) NORTH-NORTHWEST OF THE CLOSEST CORNER OF THE STATUE OF
 HV9327'GREEN FROM RHODE ISLAND, 2.36 METERS (7.74 FT) WEST OF THE DOUBLE
 HV9327'DOOR ENTRANCE TO ROOM XX, 1.96 METERS (6.43 FT) EAST OF THE EAST EDGE
 HV9327'OF THE INFORMATION AND SOUVENIER STAND AND 2.51 METERS (8.23 FT)
 HV9327'SOUTH-SOUTHWEST OF THE NEAREST CORNER OF THE STATUE OF RICHARD STOCTON
 HV9327'FROM NEW JERSEY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9328 ***********************************************************************
 HV9328  DESIGNATION -  CAP 19
 HV9328  PID         -  HV9328
 HV9328  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9328  COUNTRY     -  US
 HV9328  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9328
 HV9328                         *CURRENT SURVEY CONTROL
 HV9328  ______________________________________________________________________
 HV9328* NAD 83(1993) POSITION- 38 53 22.66794(N) 077 00 31.39324(W)   ADJUSTED
 HV9328* NAVD 88 ORTHO HEIGHT -    27.5   (meters)       90.    (feet) VERT ANG
 HV9328  ______________________________________________________________________
 HV9328  GEOID HEIGHT    -        -32.128 (meters)                     GEOID18
 HV9328  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9328  HORZ ORDER      -  THIRD
 HV9328
 HV9328.The horizontal coordinates were established by classical geodetic methods
 HV9328.and adjusted by the National Geodetic Survey in November 1994.
 HV9328
 HV9328.The orthometric height was determined by vertical angle observations.
 HV9328
 HV9328.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9328.GEOID18 height accuracy estimate available here.
 HV9328
 HV9328.Click photographs - Photos may exist for this station.
 HV9328
 HV9328.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9328
 HV9328. The following values were computed from the NAD 83(1993) position.
 HV9328
 HV9328;                    North         East     Units Scale Factor Converg.
 HV9328;SPC MD       -   135,754.184   399,243.454   MT  0.99994988   -0 00 19.7
 HV9328;SPC MD       -   445,386.85  1,309,851.23   sFT  0.99994988   -0 00 19.7
 HV9328;SPC VA N     - 2,136,799.812 3,629,373.738   MT  0.99995963   +0 55 50.6
 HV9328;SPC VA N     - 7,010,484.05 11,907,370.34   sFT  0.99995963   +0 55 50.6
 HV9328;UTM  18      - 4,306,446.566   325,783.843   MT  0.99997375   -1 15 41.2
 HV9328
 HV9328!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9328!SPC MD       -   1.00000072  x   0.99994988  =   0.99995060
 HV9328!SPC VA N     -   1.00000072  x   0.99995963  =   0.99996035
 HV9328!UTM  18      -   1.00000072  x   0.99997375  =   0.99997447
 HV9328
 HV9328_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2578306446(NAD 83)
 HV9328
 HV9328                          SUPERSEDED SURVEY CONTROL
 HV9328
 HV9328  NAD 83(1991)-  38 53 22.66860(N)    077 00 31.39328(W) AD(       ) 3
 HV9328
 HV9328.Superseded values are not recommended for survey control.
 HV9328
 HV9328.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9328.See file dsdata.pdf to determine how the superseded data were derived.
 HV9328
 HV9328_MARKER: Z = SEE DESCRIPTION
 HV9328_SETTING: 0 = UNSPECIFIED SETTING
 HV9328_MARK LOGO: NGS
 HV9328_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9328_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9328_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9328+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9328
 HV9328  HISTORY     - Date     Condition        Report By
 HV9328  HISTORY     - 1992     MONUMENTED       NGS
 HV9328
 HV9328                          STATION DESCRIPTION
 HV9328
 HV9328'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9328'STATION IS LOCATED JUST OUTSIDE THE FIRST FLOOR DOCUMENT DOOR ENTRANCE
 HV9328'OF THE CAPITOL, HOUSE SIDE.  MARK IS THE INTERSECTION OF GRANITE
 HV9328'BLOCKS 1.61 METERS (5.28 FT) WEST OF THE NORTHWEST CORNER OF PILLAR
 HV9328'NO. 4, 1.41 METER (4.63 FT) EAST OF THE CAPITOL WALL AND SOUTH END OF
 HV9328'ENTRY DOOR AND 2.28 METERS (7.48 FT) SOUTHWEST OF THE SOUTHWEST
 HV9328'CORNER OF PILLAR NO. 3.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9329 ***********************************************************************
 HV9329  DESIGNATION -  CAP 2
 HV9329  PID         -  HV9329
 HV9329  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9329  COUNTRY     -  US
 HV9329  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9329
 HV9329                         *CURRENT SURVEY CONTROL
 HV9329  ______________________________________________________________________
 HV9329* NAD 83(1993) POSITION- 38 53 23.87820(N) 077 00 31.70922(W)   ADJUSTED
 HV9329* NAVD 88 ORTHO HEIGHT -    27.6   (meters)       91.    (feet) VERT ANG
 HV9329  ______________________________________________________________________
 HV9329  GEOID HEIGHT    -        -32.128 (meters)                     GEOID18
 HV9329  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9329  HORZ ORDER      -  THIRD
 HV9329
 HV9329.The horizontal coordinates were established by classical geodetic methods
 HV9329.and adjusted by the National Geodetic Survey in November 1994.
 HV9329
 HV9329.The orthometric height was determined by vertical angle observations.
 HV9329
 HV9329.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9329.GEOID18 height accuracy estimate available here.
 HV9329
 HV9329.Click photographs - Photos may exist for this station.
 HV9329
 HV9329.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9329
 HV9329. The following values were computed from the NAD 83(1993) position.
 HV9329
 HV9329;                    North         East     Units Scale Factor Converg.
 HV9329;SPC MD       -   135,791.503   399,235.842   MT  0.99994988   -0 00 19.9
 HV9329;SPC MD       -   445,509.29  1,309,826.26   sFT  0.99994988   -0 00 19.9
 HV9329;SPC VA N     - 2,136,837.003 3,629,365.518   MT  0.99995966   +0 55 50.4
 HV9329;SPC VA N     - 7,010,606.07 11,907,343.37   sFT  0.99995966   +0 55 50.4
 HV9329;UTM  18      - 4,306,484.044   325,777.051   MT  0.99997378   -1 15 41.4
 HV9329
 HV9329!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9329!SPC MD       -   1.00000071  x   0.99994988  =   0.99995059
 HV9329!SPC VA N     -   1.00000071  x   0.99995966  =   0.99996037
 HV9329!UTM  18      -   1.00000071  x   0.99997378  =   0.99997449
 HV9329
 HV9329_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577706484(NAD 83)
 HV9329
 HV9329                          SUPERSEDED SURVEY CONTROL
 HV9329
 HV9329  NAD 83(1991)-  38 53 23.87886(N)    077 00 31.70923(W) AD(       ) 3
 HV9329
 HV9329.Superseded values are not recommended for survey control.
 HV9329
 HV9329.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9329.See file dsdata.pdf to determine how the superseded data were derived.
 HV9329
 HV9329_MARKER: Z = SEE DESCRIPTION
 HV9329_SETTING: 0 = UNSPECIFIED SETTING
 HV9329_MARK LOGO: NGS
 HV9329_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9329_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9329_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9329+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9329
 HV9329  HISTORY     - Date     Condition        Report By
 HV9329  HISTORY     - 1992     MONUMENTED       NGS
 HV9329
 HV9329                          STATION DESCRIPTION
 HV9329
 HV9329'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9329'LOCATED IN THE AREA OF THE FIRST FLOOR LAW LIBRARY DOOR ENTRANCE OF
 HV9329'THE CAPITOL, ON THE SENATE SIDE, JUST SOUTH OF THE SECURITY CHECK
 HV9329'AREA. THE STATION IS MARKED BY THE TEE INTERSECTION OF FLOOR TILES.
 HV9329'1.01 METERS (3.31 FT) NORTHEAST OF THE CLOSEST EDGE OF THE WEST ONE
 HV9329'OF TWO PILLARS. 1.70 METERS (5.58 FT) WEST NORTHWEST OF THE CLOSEST
 HV9329'EDGE OF THE EAST ONE OF TWO PILLARS.  3.20 METERS (10.50 FT) WEST OF
 HV9329'THE EAST WALL AND 2.43 METERS (7.97 FT) EAST OF THE WEST WALL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9330 ***********************************************************************
 HV9330  DESIGNATION -  CAP 20
 HV9330  PID         -  HV9330
 HV9330  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9330  COUNTRY     -  US
 HV9330  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9330
 HV9330                         *CURRENT SURVEY CONTROL
 HV9330  ______________________________________________________________________
 HV9330* NAD 83(1993) POSITION- 38 53 24.05196(N) 077 00 32.15942(W)   ADJUSTED
 HV9330* NAVD 88 ORTHO HEIGHT -    25.0   (meters)       82.    (feet) VERT ANG
 HV9330  ______________________________________________________________________
 HV9330  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 HV9330  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9330  HORZ ORDER      -  THIRD
 HV9330
 HV9330.The horizontal coordinates were established by classical geodetic methods
 HV9330.and adjusted by the National Geodetic Survey in November 1994.
 HV9330
 HV9330.The orthometric height was determined by vertical angle observations.
 HV9330
 HV9330.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9330.GEOID18 height accuracy estimate available here.
 HV9330
 HV9330.Click photographs - Photos may exist for this station.
 HV9330
 HV9330.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9330
 HV9330. The following values were computed from the NAD 83(1993) position.
 HV9330
 HV9330;                    North         East     Units Scale Factor Converg.
 HV9330;SPC MD       -   135,796.862   399,224.994   MT  0.99994988   -0 00 20.2
 HV9330;SPC MD       -   445,526.87  1,309,790.67   sFT  0.99994988   -0 00 20.2
 HV9330;SPC VA N     - 2,136,842.184 3,629,354.583   MT  0.99995967   +0 55 50.2
 HV9330;SPC VA N     - 7,010,623.07 11,907,307.49   sFT  0.99995967   +0 55 50.2
 HV9330;UTM  18      - 4,306,489.640   325,766.322   MT  0.99997382   -1 15 41.7
 HV9330
 HV9330!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9330!SPC MD       -   1.00000112  x   0.99994988  =   0.99995100
 HV9330!SPC VA N     -   1.00000112  x   0.99995967  =   0.99996079
 HV9330!UTM  18      -   1.00000112  x   0.99997382  =   0.99997494
 HV9330
 HV9330_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2576606489(NAD 83)
 HV9330
 HV9330                          SUPERSEDED SURVEY CONTROL
 HV9330
 HV9330  NAD 83(1991)-  38 53 24.05264(N)    077 00 32.15939(W) AD(       ) 3
 HV9330
 HV9330.Superseded values are not recommended for survey control.
 HV9330
 HV9330.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9330.See file dsdata.pdf to determine how the superseded data were derived.
 HV9330
 HV9330_MARKER: DD = SURVEY DISK
 HV9330_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV9330_SP_SET: DRILL HOLE IN FLOOR
 HV9330_STAMPING: CAP 20
 HV9330_MARK LOGO: NONE
 HV9330_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9330_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV9330_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9330+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9330
 HV9330  HISTORY     - Date     Condition        Report By
 HV9330  HISTORY     - 1992     MONUMENTED       NGS
 HV9330
 HV9330                          STATION DESCRIPTION
 HV9330
 HV9330'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9330'STATION IS LOCATED IN THE BASEMENT LEVEL OF THE CAPITOL IN A SMALL
 HV9330'ROOM AT THE ORIGINAL SOUTHEAST CORNER OF THE SENATE WING DIRECTLY
 HV9330'BELOW THE LATROBE CORN STALK COLUMNS AND THE PRESUMED SITE OF THE
 HV9330'ORIGINAL CORNERSTONE.  THE STATION IS MARKED BY A 30 MILLIMETER BRASS
 HV9330'DISK WITH A CONE SHAPED CENTER MARK SET IN THE FLOOR 3.36 METERS
 HV9330'(11.02 FT) WEST OF THE EAST WALL OF THE ROOM, 1.52 METERS (4.99 FT)
 HV9330'EAST OF THE CENTER OF A DOORWAY AND 1.70 METERS (5.58 FT) SOUTH OF THE
 HV9330'NORTH WALL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9333 ***********************************************************************
 HV9333  DESIGNATION -  CAP 23
 HV9333  PID         -  HV9333
 HV9333  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9333  COUNTRY     -  US
 HV9333  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9333
 HV9333                         *CURRENT SURVEY CONTROL
 HV9333  ______________________________________________________________________
 HV9333* NAD 83(1993) POSITION- 38 53 22.05592(N) 077 00 31.76490(W)   ADJUSTED
 HV9333* NAVD 88 ORTHO HEIGHT -    23.9   (meters)       78.    (feet) VERT ANG
 HV9333  ______________________________________________________________________
 HV9333  GEOID HEIGHT    -        -32.129 (meters)                     GEOID18
 HV9333  LAPLACE CORR    -         -3.28  (seconds)                    DEFLEC18
 HV9333  HORZ ORDER      -  THIRD
 HV9333
 HV9333.The horizontal coordinates were established by classical geodetic methods
 HV9333.and adjusted by the National Geodetic Survey in November 1994.
 HV9333
 HV9333.The orthometric height was determined by vertical angle observations.
 HV9333
 HV9333.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9333.GEOID18 height accuracy estimate available here.
 HV9333
 HV9333.Click photographs - Photos may exist for this station.
 HV9333
 HV9333.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9333
 HV9333. The following values were computed from the NAD 83(1993) position.
 HV9333
 HV9333;                    North         East     Units Scale Factor Converg.
 HV9333;SPC MD       -   135,735.313   399,234.495   MT  0.99994988   -0 00 19.9
 HV9333;SPC MD       -   445,324.94  1,309,821.84   sFT  0.99994988   -0 00 19.9
 HV9333;SPC VA N     - 2,136,780.797 3,629,365.089   MT  0.99995962   +0 55 50.4
 HV9333;SPC VA N     - 7,010,421.66 11,907,341.96   sFT  0.99995962   +0 55 50.4
 HV9333;UTM  18      - 4,306,427.895   325,774.472   MT  0.99997379   -1 15 41.4
 HV9333
 HV9333!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9333!SPC MD       -   1.00000128  x   0.99994988  =   0.99995116
 HV9333!SPC VA N     -   1.00000128  x   0.99995962  =   0.99996090
 HV9333!UTM  18      -   1.00000128  x   0.99997379  =   0.99997507
 HV9333
 HV9333_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577406427(NAD 83)
 HV9333
 HV9333                          SUPERSEDED SURVEY CONTROL
 HV9333
 HV9333  NAD 83(1991)-  38 53 22.05659(N)    077 00 31.76495(W) AD(       ) 3
 HV9333
 HV9333.Superseded values are not recommended for survey control.
 HV9333
 HV9333.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9333.See file dsdata.pdf to determine how the superseded data were derived.
 HV9333
 HV9333_MARKER: DD = SURVEY DISK
 HV9333_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV9333_SP_SET: DRILL HOLE IN FLOOR
 HV9333_STAMPING: CAP 23
 HV9333_MARK LOGO: NONE
 HV9333_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9333_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9333_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9333+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9333
 HV9333  HISTORY     - Date     Condition        Report By
 HV9333  HISTORY     - 1992     MONUMENTED       NGS
 HV9333
 HV9333                          STATION DESCRIPTION
 HV9333
 HV9333'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9333'LOCATED IN THE BASEMENT LEVEL OF THE CAPITOL ALONG THE NORTH-SOUTH
 HV9333'HALLWAY ON THE EAST SIDE.  STATION IS IN THE HOUSE WING DIRECTLY
 HV9333'OUTSIDE THE ENTRANCE TO ROOM HB-5 AND OPPOSITE AN EAST-WEST HALLWAY
 HV9333'NEAR THE LOCATION OF THE ORIGINAL SOUTHEAST CORNER OF THE HOUSE WING.
 HV9333'THE MARK IS 12.7 METERS (41.7 FT) SOUTH OF A STAIRWAY LEADING TO THE
 HV9333'FIRST LEVEL 0.64 METER (2.10 FT) SOUTHWEST OF THE NORTH DOOR CORNER
 HV9333'TO ROOM HB-5, 0.74 METER (2.43 FT) NORTHWEST OF THE SOUTH DOOR CORNER
 HV9333'TO ROOM HB-5, 1.79 METER (5.87 FT) SOUTHWEST OF THE NORTH DOOR CORNER
 HV9333'TO THE EAST-WEST HALLWAY, AND 1.75 METERS (5.74 FT) NORTHWEST OF THE
 HV9333'SOUTH DOOR CORNER TO THE EAST-WEST HALLWAY.  STATION IS MARKED BY A
 HV9333'30 MILLIMETER BRASS DISK WITH A CONE SHAPED CENTER MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9334 ***********************************************************************
 HV9334  DESIGNATION -  CAP 24
 HV9334  PID         -  HV9334
 HV9334  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9334  COUNTRY     -  US
 HV9334  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9334
 HV9334                         *CURRENT SURVEY CONTROL
 HV9334  ______________________________________________________________________
 HV9334* NAD 83(1993) POSITION- 38 53 22.04830(N) 077 00 32.00281(W)   NO CHECK
 HV9334* NAVD 88 ORTHO HEIGHT -    24.    (meters)       79.    (feet) VERT ANG
 HV9334  ______________________________________________________________________
 HV9334  GEOID HEIGHT    -        -32.128 (meters)                     GEOID18
 HV9334  LAPLACE CORR    -         -3.28  (seconds)                    DEFLEC18
 HV9334  HORZ ORDER      -  THIRD
 HV9334
 HV9334.The horizontal coordinates were established by classical geodetic methods
 HV9334.and adjusted by the National Geodetic Survey in November 1994.
 HV9334
 HV9334.No horizontal observational check was made to the station.
 HV9334
 HV9334.The orthometric height was determined by vertical angle observations.
 HV9334
 HV9334.No vertical observational check was made to the station.
 HV9334
 HV9334.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9334.GEOID18 height accuracy estimate available here.
 HV9334
 HV9334.Click photographs - Photos may exist for this station.
 HV9334
 HV9334.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9334
 HV9334. The following values were computed from the NAD 83(1993) position.
 HV9334
 HV9334;                    North         East     Units Scale Factor Converg.
 HV9334;SPC MD       -   135,735.078   399,228.762   MT  0.99994988   -0 00 20.1
 HV9334;SPC MD       -   445,324.17  1,309,803.03   sFT  0.99994988   -0 00 20.1
 HV9334;SPC VA N     - 2,136,780.469 3,629,359.360   MT  0.99995962   +0 55 50.3
 HV9334;SPC VA N     - 7,010,420.59 11,907,323.17   sFT  0.99995962   +0 55 50.3
 HV9334;UTM  18      - 4,306,427.787   325,768.735   MT  0.99997381   -1 15 41.5
 HV9334
 HV9334!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9334!SPC MD       -   1.00000124  x   0.99994988  =   0.99995112
 HV9334!SPC VA N     -   1.00000124  x   0.99995962  =   0.99996086
 HV9334!UTM  18      -   1.00000124  x   0.99997381  =   0.99997505
 HV9334
 HV9334_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2576806427(NAD 83)
 HV9334
 HV9334                          SUPERSEDED SURVEY CONTROL
 HV9334
 HV9334  NAD 83(1991)-  38 53 22.04898(N)    077 00 32.00288(W) AD(       ) 3
 HV9334
 HV9334.Superseded values are not recommended for survey control.
 HV9334
 HV9334.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9334.See file dsdata.pdf to determine how the superseded data were derived.
 HV9334
 HV9334_MARKER: DD = SURVEY DISK
 HV9334_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV9334_SP_SET: DRILL HOLE IN FLOOR
 HV9334_STAMPING: CAP 24
 HV9334_MARK LOGO: NONE
 HV9334_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9334_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9334_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9334+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9334
 HV9334  HISTORY     - Date     Condition        Report By
 HV9334  HISTORY     - 1992     MONUMENTED       NGS
 HV9334
 HV9334                          STATION DESCRIPTION
 HV9334
 HV9334'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9334'STATION IS LOCATED IN THE BASEMENT LEVEL OF THE CAPITOL ON THE HOUSE
 HV9334'SIDE IN A EAST-WEST HALLWAY OFF THE MAIN NORTH-SOUTH HALLWAY ALONG
 HV9334'THE EAST SIDE OF THE BUILDING, IN THE VICINITY OF ROOM HB-5 AND
 HV9334'OPPOSITE AN ENTRANCE TO A STORAGE AREA NEAR THE ORIGINAL SOUTHWEST
 HV9334'CORNER OF THE HOUSE WING.  THE STATION IS APPROXIMATELY 6.4 METERS
 HV9334'(21.0 FT) WEST OF THE ENTRANCE TO ROOM HB-5 ALONG THE EAST-WEST
 HV9334'HALLWAY, 2.05 METERS (6.73 FT) NORTHWEST OF THE EAST BUILDING CORNER
 HV9334'RECESS TO THE STORAGE ROOM AND 1.04 METERS (3.41 FT) NORTHEAST OF THE
 HV9334'WEST BUILDING CORNER RECESS TO THE STORAGE ROOM.  STATION IS MARKED
 HV9334'BY A 30 MILLIMETER BRASS DISK WITH A CONE SHAPED CENTER MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9335 ***********************************************************************
 HV9335  DESIGNATION -  CAP 25
 HV9335  PID         -  HV9335
 HV9335  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9335  COUNTRY     -  US
 HV9335  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9335
 HV9335                         *CURRENT SURVEY CONTROL
 HV9335  ______________________________________________________________________
 HV9335* NAD 83(1993) POSITION- 38 53 21.58751(N) 077 00 31.79203(W)   ADJUSTED
 HV9335* NAVD 88 ORTHO HEIGHT -    23.    (meters)       75.    (feet) VERT ANG
 HV9335  ______________________________________________________________________
 HV9335  GEOID HEIGHT    -        -32.129 (meters)                     GEOID18
 HV9335  LAPLACE CORR    -         -3.28  (seconds)                    DEFLEC18
 HV9335  HORZ ORDER      -  THIRD
 HV9335
 HV9335.The horizontal coordinates were established by classical geodetic methods
 HV9335.and adjusted by the National Geodetic Survey in November 1994.
 HV9335
 HV9335.The orthometric height was determined by vertical angle observations.
 HV9335
 HV9335.No vertical observational check was made to the station.
 HV9335
 HV9335.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9335.GEOID18 height accuracy estimate available here.
 HV9335
 HV9335.Click photographs - Photos may exist for this station.
 HV9335
 HV9335.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9335
 HV9335. The following values were computed from the NAD 83(1993) position.
 HV9335
 HV9335;                    North         East     Units Scale Factor Converg.
 HV9335;SPC MD       -   135,720.869   399,233.840   MT  0.99994988   -0 00 20.0
 HV9335;SPC MD       -   445,277.55  1,309,819.69   sFT  0.99994988   -0 00 20.0
 HV9335;SPC VA N     - 2,136,766.344 3,629,364.670   MT  0.99995961   +0 55 50.4
 HV9335;SPC VA N     - 7,010,374.25 11,907,340.59   sFT  0.99995961   +0 55 50.4
 HV9335;UTM  18      - 4,306,413.469   325,773.501   MT  0.99997379   -1 15 41.4
 HV9335
 HV9335!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9335!SPC MD       -   1.00000143  x   0.99994988  =   0.99995131
 HV9335!SPC VA N     -   1.00000143  x   0.99995961  =   0.99996104
 HV9335!UTM  18      -   1.00000143  x   0.99997379  =   0.99997522
 HV9335
 HV9335_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577306413(NAD 83)
 HV9335
 HV9335                          SUPERSEDED SURVEY CONTROL
 HV9335
 HV9335  NAD 83(1991)-  38 53 21.58818(N)    077 00 31.79209(W) AD(       ) 3
 HV9335
 HV9335.Superseded values are not recommended for survey control.
 HV9335
 HV9335.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9335.See file dsdata.pdf to determine how the superseded data were derived.
 HV9335
 HV9335_MARKER: DD = SURVEY DISK
 HV9335_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV9335_SP_SET: DRILL HOLE IN FLOOR
 HV9335_STAMPING: CAP 25
 HV9335_MARK LOGO: NONE
 HV9335_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9335_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9335_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9335+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9335
 HV9335  HISTORY     - Date     Condition        Report By
 HV9335  HISTORY     - 1992     MONUMENTED       NGS
 HV9335
 HV9335                          STATION DESCRIPTION
 HV9335
 HV9335'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9335'STATION IS LOCATED IN THE BASEMENT LEVEL OF THE CAPITOL ALONG A
 HV9335'NORTH-SOUTH HALLWAY ON THE EAST SIDE OF THE BUILDING OPPOSITE THE
 HV9335'ENTRANCE TO A STORAGE ROOM ON THE EAST SIDE OF THE HALLWAY AND JUST
 HV9335'NORTH OF THE ENTRANCE TO THE COFFEE SHOP.  THE MARK IS 1.51 METERS
 HV9335'(4.95 FT) SOUTHEAST OF THE NORTH EDGE OF THE ENTRANCE TO THE STORAGE
 HV9335'ROOM, 1.99 METERS (6.53 FT) NORTHEAST OF THE SOUTH EDGE OF THE
 HV9335'ENTRANCE TO THE STORAGE ROOM AND 7.2 METERS (23.6 FT) NORTH OF THE
 HV9335'ENTRANCE TO THE COFFEE SHOP.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9336 ***********************************************************************
 HV9336  DESIGNATION -  CAP 3
 HV9336  PID         -  HV9336
 HV9336  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9336  COUNTRY     -  US
 HV9336  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9336
 HV9336                         *CURRENT SURVEY CONTROL
 HV9336  ______________________________________________________________________
 HV9336* NAD 83(1993) POSITION- 38 53 24.02942(N) 077 00 31.91731(W)   ADJUSTED
 HV9336* NAVD 88 ORTHO HEIGHT -    27.6   (meters)       91.    (feet) VERT ANG
 HV9336  ______________________________________________________________________
 HV9336  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 HV9336  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9336  HORZ ORDER      -  THIRD
 HV9336
 HV9336.The horizontal coordinates were established by classical geodetic methods
 HV9336.and adjusted by the National Geodetic Survey in November 1994.
 HV9336
 HV9336.The orthometric height was determined by vertical angle observations.
 HV9336
 HV9336.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9336.GEOID18 height accuracy estimate available here.
 HV9336
 HV9336.Click photographs - Photos may exist for this station.
 HV9336
 HV9336.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9336
 HV9336. The following values were computed from the NAD 83(1993) position.
 HV9336
 HV9336;                    North         East     Units Scale Factor Converg.
 HV9336;SPC MD       -   135,796.167   399,230.828   MT  0.99994988   -0 00 20.0
 HV9336;SPC MD       -   445,524.59  1,309,809.81   sFT  0.99994988   -0 00 20.0
 HV9336;SPC VA N     - 2,136,841.584 3,629,360.428   MT  0.99995967   +0 55 50.3
 HV9336;SPC VA N     - 7,010,621.10 11,907,326.67   sFT  0.99995967   +0 55 50.3
 HV9336;UTM  18      - 4,306,488.817   325,772.140   MT  0.99997380   -1 15 41.5
 HV9336
 HV9336!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9336!SPC MD       -   1.00000071  x   0.99994988  =   0.99995059
 HV9336!SPC VA N     -   1.00000071  x   0.99995967  =   0.99996038
 HV9336!UTM  18      -   1.00000071  x   0.99997380  =   0.99997451
 HV9336
 HV9336_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577206488(NAD 83)
 HV9336
 HV9336                          SUPERSEDED SURVEY CONTROL
 HV9336
 HV9336  NAD 83(1991)-  38 53 24.03008(N)    077 00 31.91731(W) AD(       ) 3
 HV9336
 HV9336.Superseded values are not recommended for survey control.
 HV9336
 HV9336.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9336.See file dsdata.pdf to determine how the superseded data were derived.
 HV9336
 HV9336_MARKER: Z = SEE DESCRIPTION
 HV9336_SETTING: 0 = UNSPECIFIED SETTING
 HV9336_MARK LOGO: NGS
 HV9336_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9336_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9336_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9336+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9336
 HV9336  HISTORY     - Date     Condition        Report By
 HV9336  HISTORY     - 1992     MONUMENTED       NGS
 HV9336
 HV9336                          STATION DESCRIPTION
 HV9336
 HV9336'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9336'LOCATED IN THE AREA NORTH OF THE SECURITY CHECK INSIDE THE FIRST FLOOR
 HV9336'LAW LIBRARY DOOR ENTRANCE OF THE CAPITOL ON THE SENATE SIDE, JUST
 HV9336'INSIDE THE DOOR WHERE DEADICATION MARKERS COMMERATING THE CORNERSTONE
 HV9336'ARE FOUND. THE STATION IS MARKED BY THE TEE INTERSECTION OF FLOOR
 HV9336'TILES JUST SOUTH OF THE INSCRIBED STONE SET IN 1933 BY THE MASONS TO
 HV9336'MARK THE CORNERSTONE.  0.36 METER (1.18 FT) EAST OF THE WEST WALL,
 HV9336'0.57 METER (1.87 FT) NORTH OF THE DOOR, AND 1.93 METERS (6.33 FT)
 HV9336'SOUTH OF THE NORTH WALL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9337 ***********************************************************************
 HV9337  DESIGNATION -  CAP 4
 HV9337  PID         -  HV9337
 HV9337  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9337  COUNTRY     -  US
 HV9337  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9337
 HV9337                         *CURRENT SURVEY CONTROL
 HV9337  ______________________________________________________________________
 HV9337* NAD 83(1993) POSITION- 38 53 24.17961(N) 077 00 31.63217(W)   ADJUSTED
 HV9337* NAVD 88 ORTHO HEIGHT -    27.6   (meters)       91.    (feet) VERT ANG
 HV9337  ______________________________________________________________________
 HV9337  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 HV9337  LAPLACE CORR    -         -3.30  (seconds)                    DEFLEC18
 HV9337  HORZ ORDER      -  THIRD
 HV9337
 HV9337.The horizontal coordinates were established by classical geodetic methods
 HV9337.and adjusted by the National Geodetic Survey in November 1994.
 HV9337
 HV9337.The orthometric height was determined by vertical angle observations.
 HV9337
 HV9337.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9337.GEOID18 height accuracy estimate available here.
 HV9337
 HV9337.Click photographs - Photos may exist for this station.
 HV9337
 HV9337.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9337
 HV9337. The following values were computed from the NAD 83(1993) position.
 HV9337
 HV9337;                    North         East     Units Scale Factor Converg.
 HV9337;SPC MD       -   135,800.797   399,237.700   MT  0.99994988   -0 00 19.9
 HV9337;SPC MD       -   445,539.78  1,309,832.35   sFT  0.99994988   -0 00 19.9
 HV9337;SPC VA N     - 2,136,846.326 3,629,367.224   MT  0.99995967   +0 55 50.5
 HV9337;SPC VA N     - 7,010,636.65 11,907,348.97   sFT  0.99995967   +0 55 50.5
 HV9337;UTM  18      - 4,306,493.296   325,779.112   MT  0.99997377   -1 15 41.4
 HV9337
 HV9337!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9337!SPC MD       -   1.00000071  x   0.99994988  =   0.99995059
 HV9337!SPC VA N     -   1.00000071  x   0.99995967  =   0.99996038
 HV9337!UTM  18      -   1.00000071  x   0.99997377  =   0.99997448
 HV9337
 HV9337_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577906493(NAD 83)
 HV9337
 HV9337                          SUPERSEDED SURVEY CONTROL
 HV9337
 HV9337  NAD 83(1991)-  38 53 24.18027(N)    077 00 31.63215(W) AD(       ) 3
 HV9337
 HV9337.Superseded values are not recommended for survey control.
 HV9337
 HV9337.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9337.See file dsdata.pdf to determine how the superseded data were derived.
 HV9337
 HV9337_MARKER: Z = SEE DESCRIPTION
 HV9337_SETTING: 0 = UNSPECIFIED SETTING
 HV9337_MARK LOGO: NGS
 HV9337_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9337_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9337_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9337+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9337
 HV9337  HISTORY     - Date     Condition        Report By
 HV9337  HISTORY     - 1992     MONUMENTED       NGS
 HV9337
 HV9337                          STATION DESCRIPTION
 HV9337
 HV9337'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9337'STATION IS LOCATED AT THE TOP OF THE STAIRS LEADING TO THE BASEMENT
 HV9337'LEVEL OF THE CAPITOL, NORTH OF THE SECURITY CHECK AREA INSIDE THE LAW
 HV9337'LIBRARY DOOR ENTRANCE ON THE FIRST FLOOR, SENATE SIDE, ADJACENT TO
 HV9337'THE ELEVATOR. STATION IS MARKED BY A PUNCH MARK IN THE CONCRETE
 HV9337'LANDING, 0.38 METER (1.25 FT) SOUTH OF THE NORTH WALL, 0.40 METER
 HV9337'(1.31 FT) WEST OF THE EAST EDGE OF THE LANDING, AND 1.51 METERS
 HV9337'(4.95 FT) EAST OF THE WEST WALL OF THE HALL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9338 ***********************************************************************
 HV9338  DESIGNATION -  CAP 45 DEGREES
 HV9338  PID         -  HV9338
 HV9338  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9338  COUNTRY     -  US
 HV9338  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9338
 HV9338                         *CURRENT SURVEY CONTROL
 HV9338  ______________________________________________________________________
 HV9338* NAD 83(1993) POSITION- 38 53 23.78223(N) 077 00 32.01122(W)   NO CHECK
 HV9338* NAVD 88 ORTHO HEIGHT -    25.    (meters)       82.    (feet) SCALED
 HV9338  ______________________________________________________________________
 HV9338  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 HV9338  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9338  HORZ ORDER      -  THIRD
 HV9338
 HV9338.The horizontal coordinates were established by classical geodetic methods
 HV9338.and adjusted by the National Geodetic Survey in November 1994.
 HV9338
 HV9338.No horizontal observational check was made to the station.
 HV9338
 HV9338.The orthometric height was scaled from a topographic map.
 HV9338
 HV9338.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9338.GEOID18 height accuracy estimate available here.
 HV9338
 HV9338.Click photographs - Photos may exist for this station.
 HV9338
 HV9338.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9338
 HV9338. The following values were computed from the NAD 83(1993) position.
 HV9338
 HV9338;                    North         East     Units Scale Factor Converg.
 HV9338;SPC MD       -   135,788.545   399,228.564   MT  0.99994988   -0 00 20.1
 HV9338;SPC MD       -   445,499.58  1,309,802.38   sFT  0.99994988   -0 00 20.1
 HV9338;SPC VA N     - 2,136,833.926 3,629,358.289   MT  0.99995966   +0 55 50.3
 HV9338;SPC VA N     - 7,010,595.97 11,907,319.65   sFT  0.99995966   +0 55 50.3
 HV9338;UTM  18      - 4,306,481.246   325,769.710   MT  0.99997381   -1 15 41.6
 HV9338
 HV9338!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9338!SPC MD       -   1.00000112  x   0.99994988  =   0.99995100
 HV9338!SPC VA N     -   1.00000112  x   0.99995966  =   0.99996078
 HV9338!UTM  18      -   1.00000112  x   0.99997381  =   0.99997493
 HV9338
 HV9338_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2576906481(NAD 83)
 HV9338
 HV9338                          SUPERSEDED SURVEY CONTROL
 HV9338
 HV9338  NAD 83(1991)-  38 53 23.78292(N)    077 00 32.01120(W) AD(       ) 3
 HV9338
 HV9338.Superseded values are not recommended for survey control.
 HV9338
 HV9338.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9338.See file dsdata.pdf to determine how the superseded data were derived.
 HV9338
 HV9338_MARKER: DD = SURVEY DISK
 HV9338_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV9338_SP_SET: VERTICALLY IN A WALL
 HV9338_STAMPING: 45 DEGREES
 HV9338_MARK LOGO: NONE
 HV9338_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9338_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9338_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9338+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9338
 HV9338  HISTORY     - Date     Condition        Report By
 HV9338  HISTORY     - 1992     MONUMENTED       NGS
 HV9338
 HV9338                          STATION DESCRIPTION
 HV9338
 HV9338'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9338'STATION IS LOCATED IN THE BASEMENT LEVEL OF THE CAPITOL IN A SMALL
 HV9338'ROOM AT THE ORIGINAL SOUTHEAST CORNER OF THE SENATE WING DIRECTLY
 HV9338'BELOW THE LATROBE CORN STALK COLUMNS AND THE PRESUMED SITE OF THE
 HV9338'ORIGINAL CORNERSTONE.  THIS STATION MARKS THE APPROXIMATE (+/- ONE
 HV9338'DEGREE)INTERSECTION OF AN AZIMUTH OF 45 DEGREES EAST OF NORTH FROM
 HV9338'THE CENTER OF THE CAPITOL UNDER THE ROTUNDA AND THE EAST WALL OF THE
 HV9338'ORIGINAL HOUSE BUILDING.  THE STATION IS MARKED BY A 30 MILLIMETER
 HV9338'BRASS DISK SET VERTICALLY IN THE FACE OF THE EAST WALL 0.67 METER
 HV9338'(2.20 FT) NORTH OF THE SOUTHEAST CORNER OF THE ROOM, 0.55 METER
 HV9338'(1.80 FT) ABOVE THE STONE FOUNDATION, 1.90 METERS (6.23 FT) EAST OF
 HV9338'THE EAST WALL OF A CHIMNEY, AND 2.75 METERS (9.02 FT) SOUTHEAST OF
 HV9338'THE NORTHEAST CORNER OF A CHIMNEY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9339 ***********************************************************************
 HV9339  DESIGNATION -  CAP 5
 HV9339  PID         -  HV9339
 HV9339  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9339  COUNTRY     -  US
 HV9339  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9339
 HV9339                         *CURRENT SURVEY CONTROL
 HV9339  ______________________________________________________________________
 HV9339* NAD 83(1993) POSITION- 38 53 24.15111(N) 077 00 31.51589(W)   ADJUSTED
 HV9339* NAVD 88 ORTHO HEIGHT -    26.2   (meters)       86.    (feet) VERT ANG
 HV9339  ______________________________________________________________________
 HV9339  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 HV9339  LAPLACE CORR    -         -3.30  (seconds)                    DEFLEC18
 HV9339  HORZ ORDER      -  THIRD
 HV9339
 HV9339.The horizontal coordinates were established by classical geodetic methods
 HV9339.and adjusted by the National Geodetic Survey in November 1994.
 HV9339
 HV9339.The orthometric height was determined by vertical angle observations.
 HV9339
 HV9339.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9339.GEOID18 height accuracy estimate available here.
 HV9339
 HV9339.Click photographs - Photos may exist for this station.
 HV9339
 HV9339.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9339
 HV9339. The following values were computed from the NAD 83(1993) position.
 HV9339
 HV9339;                    North         East     Units Scale Factor Converg.
 HV9339;SPC MD       -   135,799.918   399,240.502   MT  0.99994988   -0 00 19.8
 HV9339;SPC MD       -   445,536.90  1,309,841.55   sFT  0.99994988   -0 00 19.8
 HV9339;SPC VA N     - 2,136,845.493 3,629,370.040   MT  0.99995967   +0 55 50.6
 HV9339;SPC VA N     - 7,010,633.92 11,907,358.21   sFT  0.99995967   +0 55 50.6
 HV9339;UTM  18      - 4,306,492.355   325,781.894   MT  0.99997376   -1 15 41.3
 HV9339
 HV9339!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9339!SPC MD       -   1.00000092  x   0.99994988  =   0.99995080
 HV9339!SPC VA N     -   1.00000092  x   0.99995967  =   0.99996059
 HV9339!UTM  18      -   1.00000092  x   0.99997376  =   0.99997468
 HV9339
 HV9339_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2578106492(NAD 83)
 HV9339
 HV9339                          SUPERSEDED SURVEY CONTROL
 HV9339
 HV9339  NAD 83(1991)-  38 53 24.15178(N)    077 00 31.51587(W) AD(       ) 3
 HV9339
 HV9339.Superseded values are not recommended for survey control.
 HV9339
 HV9339.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9339.See file dsdata.pdf to determine how the superseded data were derived.
 HV9339
 HV9339_MARKER: Z = SEE DESCRIPTION
 HV9339_SETTING: 0 = UNSPECIFIED SETTING
 HV9339_MARK LOGO: NGS
 HV9339_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9339_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9339_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9339+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9339
 HV9339  HISTORY     - Date     Condition        Report By
 HV9339  HISTORY     - 1992     MONUMENTED       NGS
 HV9339
 HV9339                          STATION DESCRIPTION
 HV9339
 HV9339'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9339'STATION IS LOCATED ON THE STAIRWAY LANDING MIDWAY BETWEEN THE FIRST
 HV9339'AND BASEMENT LEVELS OF THE CAPITOL. IN THE STAIRWELL LOCATED JUST
 HV9339'NORTH OF THE SECURITY CHECK AREA INSIDE THE LAW LIBRARY DOOR
 HV9339'ENTRANCE, FIRST FLOOR LEVEL, SENATE SIDE.  STATION IS MARKED BY A
 HV9339'PUNCH MARK IN THE CONCRETE LANDING, 1.27 METERS (4.17 FT) SOUTH OF
 HV9339'THE NORTH WALL, 1.20 METERS (3.94 FT) NORTH OF THE SOUTH WALL, AND
 HV9339'0.35 METERS (1.15 FT) WEST OF THE EAST WALL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9340 ***********************************************************************
 HV9340  DESIGNATION -  CAP 6
 HV9340  PID         -  HV9340
 HV9340  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9340  COUNTRY     -  US
 HV9340  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9340
 HV9340                         *CURRENT SURVEY CONTROL
 HV9340  ______________________________________________________________________
 HV9340* NAD 83(1993) POSITION- 38 53 24.12974(N) 077 00 31.69409(W)   ADJUSTED
 HV9340* NAVD 88 ORTHO HEIGHT -    23.9   (meters)       78.    (feet) VERT ANG
 HV9340  ______________________________________________________________________
 HV9340  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 HV9340  LAPLACE CORR    -         -3.30  (seconds)                    DEFLEC18
 HV9340  HORZ ORDER      -  THIRD
 HV9340
 HV9340.The horizontal coordinates were established by classical geodetic methods
 HV9340.and adjusted by the National Geodetic Survey in November 1994.
 HV9340
 HV9340.The orthometric height was determined by vertical angle observations.
 HV9340
 HV9340.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9340.GEOID18 height accuracy estimate available here.
 HV9340
 HV9340.Click photographs - Photos may exist for this station.
 HV9340
 HV9340.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9340
 HV9340. The following values were computed from the NAD 83(1993) position.
 HV9340
 HV9340;                    North         East     Units Scale Factor Converg.
 HV9340;SPC MD       -   135,799.260   399,236.208   MT  0.99994988   -0 00 19.9
 HV9340;SPC MD       -   445,534.74  1,309,827.46   sFT  0.99994988   -0 00 19.9
 HV9340;SPC VA N     - 2,136,844.764 3,629,365.757   MT  0.99995967   +0 55 50.5
 HV9340;SPC VA N     - 7,010,631.53 11,907,344.15   sFT  0.99995967   +0 55 50.5
 HV9340;UTM  18      - 4,306,491.791   325,777.586   MT  0.99997378   -1 15 41.4
 HV9340
 HV9340!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9340!SPC MD       -   1.00000129  x   0.99994988  =   0.99995117
 HV9340!SPC VA N     -   1.00000129  x   0.99995967  =   0.99996096
 HV9340!UTM  18      -   1.00000129  x   0.99997378  =   0.99997507
 HV9340
 HV9340_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577706491(NAD 83)
 HV9340
 HV9340                          SUPERSEDED SURVEY CONTROL
 HV9340
 HV9340  NAD 83(1991)-  38 53 24.13041(N)    077 00 31.69407(W) AD(       ) 3
 HV9340
 HV9340.Superseded values are not recommended for survey control.
 HV9340
 HV9340.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9340.See file dsdata.pdf to determine how the superseded data were derived.
 HV9340
 HV9340_MARKER: Z = SEE DESCRIPTION
 HV9340_SETTING: 0 = UNSPECIFIED SETTING
 HV9340_MARK LOGO: NGS
 HV9340_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9340_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9340_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9340+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9340
 HV9340  HISTORY     - Date     Condition        Report By
 HV9340  HISTORY     - 1992     MONUMENTED       NGS
 HV9340
 HV9340                          STATION DESCRIPTION
 HV9340
 HV9340'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9340'STATION IS LOCATED ON THE BASEMENT LANDING OF THE STAIRS NORTH OF THE
 HV9340'SECURITY CHECK AREA INSIDE THE LAW LIBRARY DOOR ENTRANCE, FIRST FLOOR
 HV9340'LEVEL, SENATE WING OF THE CAPITOL AND JUST WEST OF STATION CAP 5.
 HV9340'STATION IS MARKED BY A PUNCH MARK IN THE CONCRETE LANDING, 0.53 METER
 HV9340'(1.74 FT) NORTH OF THE SOUTH WALL, 0.82 METER (2.69 FT) EAST OF THE
 HV9340'WEST WALL, AND 0.54 METER (1.77 FT) WEST OF THE EDGE OF THE BOTTOM
 HV9340'STEP.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9341 ***********************************************************************
 HV9341  DESIGNATION -  CAP 7
 HV9341  PID         -  HV9341
 HV9341  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9341  COUNTRY     -  US
 HV9341  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9341
 HV9341                         *CURRENT SURVEY CONTROL
 HV9341  ______________________________________________________________________
 HV9341* NAD 83(1993) POSITION- 38 53 24.23603(N) 077 00 31.80260(W)   ADJUSTED
 HV9341* NAVD 88 ORTHO HEIGHT -    23.9   (meters)       78.    (feet) VERT ANG
 HV9341  ______________________________________________________________________
 HV9341  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 HV9341  LAPLACE CORR    -         -3.30  (seconds)                    DEFLEC18
 HV9341  HORZ ORDER      -  THIRD
 HV9341
 HV9341.The horizontal coordinates were established by classical geodetic methods
 HV9341.and adjusted by the National Geodetic Survey in November 1994.
 HV9341
 HV9341.The orthometric height was determined by vertical angle observations.
 HV9341
 HV9341.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9341.GEOID18 height accuracy estimate available here.
 HV9341
 HV9341.Click photographs - Photos may exist for this station.
 HV9341
 HV9341.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9341
 HV9341. The following values were computed from the NAD 83(1993) position.
 HV9341
 HV9341;                    North         East     Units Scale Factor Converg.
 HV9341;SPC MD       -   135,802.537   399,233.593   MT  0.99994988   -0 00 20.0
 HV9341;SPC MD       -   445,545.49  1,309,818.88   sFT  0.99994988   -0 00 20.0
 HV9341;SPC VA N     - 2,136,847.999 3,629,363.089   MT  0.99995967   +0 55 50.4
 HV9341;SPC VA N     - 7,010,642.14 11,907,335.40   sFT  0.99995967   +0 55 50.4
 HV9341;UTM  18      - 4,306,495.125   325,775.044   MT  0.99997379   -1 15 41.5
 HV9341
 HV9341!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9341!SPC MD       -   1.00000129  x   0.99994988  =   0.99995117
 HV9341!SPC VA N     -   1.00000129  x   0.99995967  =   0.99996096
 HV9341!UTM  18      -   1.00000129  x   0.99997379  =   0.99997508
 HV9341
 HV9341_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577506495(NAD 83)
 HV9341
 HV9341                          SUPERSEDED SURVEY CONTROL
 HV9341
 HV9341  NAD 83(1991)-  38 53 24.23670(N)    077 00 31.80257(W) AD(       ) 3
 HV9341
 HV9341.Superseded values are not recommended for survey control.
 HV9341
 HV9341.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9341.See file dsdata.pdf to determine how the superseded data were derived.
 HV9341
 HV9341_MARKER: DD = SURVEY DISK
 HV9341_SETTING: 40 = SET IN A LARGE STRUCTURE WITH DEEP FOUNDATIONS
 HV9341_SP_SET: DRILL HOLE IN FLOOR
 HV9341_STAMPING: CAP 7
 HV9341_MARK LOGO: NONE
 HV9341_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9341_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9341_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9341+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9341
 HV9341  HISTORY     - Date     Condition        Report By
 HV9341  HISTORY     - 1992     MONUMENTED       NGS
 HV9341
 HV9341                          STATION DESCRIPTION
 HV9341
 HV9341'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9341'STATION IS LOCATED IN THE NORTH-SOUTH BASEMENT HALLWAY OF THE CAPITOL
 HV9341'ON THE EAST SIDE NEAR THE STAIRWELL ENTRANCE LEADING TO THE LAW
 HV9341'LIBRARY ENTRANCE ON THE SENATE SIDE.  STATION IS MARKED BY A 30
 HV9341'MILLIMETER BRASS DISK WITH A CONE SHAPED CENTER MARK SET INTO A DRILL
 HV9341'HOLE IN THE FLOOR OF THE HALLWAY. STATION IS 0.63 METER (2.07 FT)
 HV9341'EAST OF THE WEST WALL, 1.34 METERS (4.40 FT) WEST OF THE EAST WALL,
 HV9341'AND 2.42 METERS (7.94 FT) SOUTHWEST OF THE NORTH EDGE OF THE DOOR
 HV9341'INTO ROOM SB-4.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9342 ***********************************************************************
 HV9342  DESIGNATION -  CAP 8
 HV9342  PID         -  HV9342
 HV9342  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9342  COUNTRY     -  US
 HV9342  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9342
 HV9342                         *CURRENT SURVEY CONTROL
 HV9342  ______________________________________________________________________
 HV9342* NAD 83(1993) POSITION- 38 53 25.16948(N) 077 00 31.77502(W)   ADJUSTED
 HV9342* NAVD 88 ORTHO HEIGHT -    22.8   (meters)       75.    (feet) VERT ANG
 HV9342  ______________________________________________________________________
 HV9342  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 HV9342  LAPLACE CORR    -         -3.30  (seconds)                    DEFLEC18
 HV9342  HORZ ORDER      -  THIRD
 HV9342
 HV9342.The horizontal coordinates were established by classical geodetic methods
 HV9342.and adjusted by the National Geodetic Survey in November 1994.
 HV9342
 HV9342.The orthometric height was determined by vertical angle observations.
 HV9342
 HV9342.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9342.GEOID18 height accuracy estimate available here.
 HV9342
 HV9342.Click photographs - Photos may exist for this station.
 HV9342
 HV9342.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9342
 HV9342. The following values were computed from the NAD 83(1993) position.
 HV9342
 HV9342;                    North         East     Units Scale Factor Converg.
 HV9342;SPC MD       -   135,831.321   399,234.261   MT  0.99994988   -0 00 19.9
 HV9342;SPC MD       -   445,639.93  1,309,821.07   sFT  0.99994988   -0 00 19.9
 HV9342;SPC VA N     - 2,136,876.789 3,629,363.286   MT  0.99995969   +0 55 50.4
 HV9342;SPC VA N     - 7,010,736.60 11,907,336.05   sFT  0.99995969   +0 55 50.4
 HV9342;UTM  18      - 4,306,523.888   325,776.342   MT  0.99997378   -1 15 41.5
 HV9342
 HV9342!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9342!SPC MD       -   1.00000147  x   0.99994988  =   0.99995135
 HV9342!SPC VA N     -   1.00000147  x   0.99995969  =   0.99996116
 HV9342!UTM  18      -   1.00000147  x   0.99997378  =   0.99997525
 HV9342
 HV9342_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577606523(NAD 83)
 HV9342
 HV9342                          SUPERSEDED SURVEY CONTROL
 HV9342
 HV9342  NAD 83(1991)-  38 53 25.17015(N)    077 00 31.77496(W) AD(       ) 3
 HV9342
 HV9342.Superseded values are not recommended for survey control.
 HV9342
 HV9342.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9342.See file dsdata.pdf to determine how the superseded data were derived.
 HV9342
 HV9342_MARKER: DD = SURVEY DISK
 HV9342_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV9342_SP_SET: DRILL HOLE IN FLOOR
 HV9342_STAMPING: CAP 8
 HV9342_MARK LOGO: NONE
 HV9342_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9342_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9342_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9342+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9342
 HV9342  HISTORY     - Date     Condition        Report By
 HV9342  HISTORY     - 1992     MONUMENTED       NGS
 HV9342
 HV9342                          STATION DESCRIPTION
 HV9342
 HV9342'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9342'STATION IS LOCATED IN THE NORTH-SOUTH BASEMENT HALLWAY OF THE CAPITOL
 HV9342'ON THE EAST SIDE, SENATE WING, AT A RIGHT (EAST) TURN IN THE HALLWAY
 HV9342'NEAR DOUBLE DOORS COVERING THE ORIGINAL NORTHEAST CORNER OF THE
 HV9342'CAPITOL. STATION IS MARKED BY A 30 MILLIMETER BRASS DISK SET IN THE
 HV9342'FLOOR WITH A CONE SHAPED CENTER MARK, 1.57 METERS (5.15 FT) EAST OF
 HV9342'THE WEST WALL, 0.89 SOUTH OF THE NORTH WALL AND 1.16 METER (3.81 FT)
 HV9342'NORTHWEST OF THE CORNER OF EAST WALL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9343 ***********************************************************************
 HV9343  DESIGNATION -  CAP 9
 HV9343  PID         -  HV9343
 HV9343  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9343  COUNTRY     -  US
 HV9343  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9343
 HV9343                         *CURRENT SURVEY CONTROL
 HV9343  ______________________________________________________________________
 HV9343* NAD 83(1993) POSITION- 38 53 23.97942(N) 077 00 31.76873(W)   ADJUSTED
 HV9343* NAVD 88 ORTHO HEIGHT -    23.9   (meters)       78.    (feet) VERT ANG
 HV9343  ______________________________________________________________________
 HV9343  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 HV9343  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9343  HORZ ORDER      -  THIRD
 HV9343
 HV9343.The horizontal coordinates were established by classical geodetic methods
 HV9343.and adjusted by the National Geodetic Survey in November 1994.
 HV9343
 HV9343.The orthometric height was determined by vertical angle observations.
 HV9343
 HV9343.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9343.GEOID18 height accuracy estimate available here.
 HV9343
 HV9343.Click photographs - Photos may exist for this station.
 HV9343
 HV9343.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9343
 HV9343. The following values were computed from the NAD 83(1993) position.
 HV9343
 HV9343;                    North         East     Units Scale Factor Converg.
 HV9343;SPC MD       -   135,794.625   399,234.409   MT  0.99994988   -0 00 19.9
 HV9343;SPC MD       -   445,519.53  1,309,821.56   sFT  0.99994988   -0 00 19.9
 HV9343;SPC VA N     - 2,136,840.100 3,629,364.034   MT  0.99995966   +0 55 50.4
 HV9343;SPC VA N     - 7,010,616.23 11,907,338.50   sFT  0.99995966   +0 55 50.4
 HV9343;UTM  18      - 4,306,487.197   325,775.686   MT  0.99997378   -1 15 41.4
 HV9343
 HV9343!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9343!SPC MD       -   1.00000129  x   0.99994988  =   0.99995117
 HV9343!SPC VA N     -   1.00000129  x   0.99995966  =   0.99996095
 HV9343!UTM  18      -   1.00000129  x   0.99997378  =   0.99997507
 HV9343
 HV9343_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577506487(NAD 83)
 HV9343
 HV9343                          SUPERSEDED SURVEY CONTROL
 HV9343
 HV9343  NAD 83(1991)-  38 53 23.98009(N)    077 00 31.76871(W) AD(       ) 3
 HV9343
 HV9343.Superseded values are not recommended for survey control.
 HV9343
 HV9343.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9343.See file dsdata.pdf to determine how the superseded data were derived.
 HV9343
 HV9343_MARKER: DD = SURVEY DISK
 HV9343_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV9343_SP_SET: DRILL HOLE IN FLOOR
 HV9343_STAMPING: CAP 9
 HV9343_MARK LOGO: NONE
 HV9343_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9343_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9343_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9343+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9343
 HV9343  HISTORY     - Date     Condition        Report By
 HV9343  HISTORY     - 1992     MONUMENTED       NGS
 HV9343
 HV9343                          STATION DESCRIPTION
 HV9343
 HV9343'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9343'STATION IS LOCATED IN THE NORTH-SOUTH BASEMENT HALLWAY OF THE CAPITOL
 HV9343'ON THE EAST SIDE, SENATE WING NEAR THE ENTRANCE TO A TELEPHONE SWITCH
 HV9343'ROOM JUST SOUTH OF THE STAIRWAY LEADING TO THE LAW LIBRARY ENTRANCE
 HV9343'ON THE FIRST FLOOR.  STATION IS MARKED BY A 30 MILLIMETER BRASS DISK
 HV9343'WITH A CONE SHAPED CENTER MARK SET IN THE FLOOR OF THE HALLWAY, 1.12
 HV9343'METER (3.67 FT) WEST OF THE EAST WALL, 1.13 METERS (3.71 FT) EAST OF
 HV9343'THE WEST WALL AND 1.58 METERS (5.18 FT) NORTHEAST OF THE NORTH EDGE
 HV9343'OF THE DOOR INTO THE TELEPHONE ROOM.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2017 ***********************************************************************
 HV2017  DESIGNATION -  CAPITOL=M 15
 HV2017  PID         -  HV2017
 HV2017  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2017  COUNTRY     -  US
 HV2017  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2017
 HV2017                         *CURRENT SURVEY CONTROL
 HV2017  ______________________________________________________________________
 HV2017* NAD 83(1986) POSITION- 38 53 25.51   (N) 077 00 31.47   (W)   HD_HELD1
 HV2017* NAVD 88 ORTHO HEIGHT -    27.355 (meters)       89.75  (feet) ADJUSTED
 HV2017  ______________________________________________________________________
 HV2017  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 HV2017  DYNAMIC HEIGHT  -         27.340 (meters)       89.70  (feet) COMP
 HV2017  MODELED GRAVITY -    980,100.9   (mgal)                       NAVD 88
 HV2017
 HV2017  VERT ORDER      -  FIRST     CLASS II
 HV2017
 HV2017.The horizontal coordinates were determined by differentially corrected
 HV2017.hand held GPS observations or other comparable positioning techniques
 HV2017.and have an estimated accuracy of +/- 3 meters.
 HV2017
 HV2017.The orthometric height was determined by differential leveling and
 HV2017.adjusted by the NATIONAL GEODETIC SURVEY
 HV2017.in October 2012.
 HV2017
 HV2017.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2017.GEOID18 height accuracy estimate available here.
 HV2017
 HV2017.Click photographs - Photos may exist for this station.
 HV2017
 HV2017.The dynamic height is computed by dividing the NAVD 88
 HV2017.geopotential number by the normal gravity value computed on the
 HV2017.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2017.degrees latitude (g = 980.6199 gals.).
 HV2017
 HV2017.The modeled gravity was interpolated from observed gravity values.
 HV2017
 HV2017
 HV2017_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2578306534(NAD 83)
 HV2017
 HV2017                          SUPERSEDED SURVEY CONTROL
 HV2017
 HV2017  NAVD 88 (06/15/91)   27.354  (m)           89.74   (f) SUPERSEDED  1 1
 HV2017  NGVD 29 (08/12/92)   27.591  (m)           90.52   (f) ADJUSTED    1 1
 HV2017  NGVD 29 (??/??/87)   27.591  (m)           90.52   (f) SUPERSEDED  1 1
 HV2017
 HV2017.Superseded values are not recommended for survey control.
 HV2017
 HV2017.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2017.See file dsdata.pdf to determine how the superseded data were derived.
 HV2017
 HV2017_MARKER: B = BOLT
 HV2017_SETTING: 40 = SET IN A LARGE STRUCTURE WITH DEEP FOUNDATIONS
 HV2017_SP_SET: BUILDING
 HV2017_STAMPING: CAPITOL BENCH MARK U.S. COAST AND GEODETIC SURVEY
 HV2017_MARK LOGO: CGS
 HV2017_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV2017_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 HV2017+STABILITY: POSITION/ELEVATION WELL
 HV2017_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV2017+SATELLITE: SATELLITE OBSERVATIONS - January 14, 2020
 HV2017
 HV2017  HISTORY     - Date     Condition        Report By
 HV2017  HISTORY     - 1884     MONUMENTED       CGS
 HV2017  HISTORY     - 1971     GOOD             NGS
 HV2017  HISTORY     - 1974     GOOD             NGS
 HV2017  HISTORY     - 1979     GOOD             NGS
 HV2017  HISTORY     - 19920512 GOOD             NGS
 HV2017  HISTORY     - 20100314 GOOD             GEOCAC
 HV2017  HISTORY     - 20120222 GOOD             NGS
 HV2017  HISTORY     - 20200114 GOOD             MDSHA
 HV2017
 HV2017                          STATION DESCRIPTION
 HV2017
 HV2017'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV2017'AT WASHINGTON.
 HV2017'AT WASHINGTON, D.C., AT THE CAPITOL BUILDING, 121 FEET NORTH OF
 HV2017'THE CENTER OF THE EAST (MAIN) ENTRANCE TO THE BUILDING, BELOW
 HV2017'THE FIRST WINDOW WEST OF THE SOUTHEAST CORNER OF THE CAPITOL WING
 HV2017'OF THE BUILDING, 0.7 FOOT SOUTH OF THE SOUTH FACE OF THE SENATE
 HV2017'WING OF THE BUILDING, 16.9 FEET WEST OF THE SOUTHEAST CORNER OF
 HV2017'THE GRANITE WATER TABLE, SET IN THE TOP OF THE GRANITE WATER
 HV2017'TABLE AND ABOUT 3 FEET AOVE THE LEVEL OF THE SIDEWALK.
 HV2017'NOTE-- THIS MARK IS ALSO 183.6 FEET NORTH OF BM 52 (DC ENGRS) =
 HV2017'TIDAL MARK RESET 1971.
 HV2017
 HV2017                          STATION RECOVERY (1974)
 HV2017
 HV2017'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974
 HV2017'RECOVERED IN GOOD CONDITION.
 HV2017
 HV2017                          STATION RECOVERY (1979)
 HV2017
 HV2017'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV2017'INSCRIBED CAPITOL BENCH MARK U.S. COAST AND GEODEDTIC SURVEY 1884.
 HV2017
 HV2017                          STATION RECOVERY (1992)
 HV2017
 HV2017'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV2017'IN WASHINGTON, D.C., AT THE U.S. CAPITOL, A COPPER BOLT IN TOP OF THE
 HV2017'WATER TABLE BELOW THE 1ST WINDOW WEST OF THE SOUTHEAST CORNER OF THE
 HV2017'NORTH WING OF THE BUILDING, 36.9 M (121.1 FT) NORTH OF THE PROJECTED
 HV2017'CENTER OF THE EAST (MAIN) ENTRANCE TO THE BUILDING, 5.2 M (17.1 FT)
 HV2017'WEST OF THE SOUTHEAST CORNER OF THE WATER TABLE, 0.9 M (3.0 FT) ABOVE
 HV2017'THE GROUND SURFACE, AND 0.2 M (0.7 FT) SOUTH OF THE SOUTH FACE OF THE
 HV2017'NORTH WING.  NOTE--THE BOLT IS IN THE CENTER OF A 5-INCH BRASS PLATE
 HV2017'INSCRIBED CAPITOL BENCH MARK U.S. COAST AND GEODETIC SURVEY 1884.
 HV2017
 HV2017                          STATION RECOVERY (2010)
 HV2017
 HV2017'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 HV2017'RECOVERED IN GOOD CONDITION.
 HV2017
 HV2017                          STATION RECOVERY (2012)
 HV2017
 HV2017'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV2017'RECOVERED IN GOOD CONDITION.
 HV2017
 HV2017                          STATION RECOVERY (2020)
 HV2017
 HV2017'RECOVERY NOTE BY MARYLAND DOT HIGHWAY ADMINISTRATION 2020 (JML)
 HV2017'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4196 ***********************************************************************
 HV4196  DESIGNATION -  CATHEDRAL
 HV4196  PID         -  HV4196
 HV4196  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4196  COUNTRY     -  US
 HV4196  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4196
 HV4196                         *CURRENT SURVEY CONTROL
 HV4196  ______________________________________________________________________
 HV4196* NAD 83(1993) POSITION- 38 55 50.67714(N) 077 04 12.31252(W)   ADJUSTED
 HV4196  ______________________________________________________________________
 HV4196  GEOID HEIGHT    -        -31.970 (meters)                     GEOID18
 HV4196  LAPLACE CORR    -         -3.08  (seconds)                    DEFLEC18
 HV4196  HORZ ORDER      -  THIRD
 HV4196
 HV4196.The horizontal coordinates were established by classical geodetic methods
 HV4196.and adjusted by the National Geodetic Survey in November 1994.
 HV4196
 HV4196.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4196.GEOID18 height accuracy estimate available here.
 HV4196
 HV4196.Click photographs - Photos may exist for this station.
 HV4196
 HV4196.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4196
 HV4196. The following values were computed from the NAD 83(1993) position.
 HV4196
 HV4196;                    North         East     Units Scale Factor Converg.
 HV4196;SPC MD       -   140,320.435   393,923.020   MT  0.99995031   -0 02 38.4
 HV4196;SPC MD       -   460,367.96  1,292,395.77   sFT  0.99995031   -0 02 38.4
 HV4196;SPC VA N     - 2,141,278.563 3,623,979.336   MT  0.99996329   +0 53 32.8
 HV4196;SPC VA N     - 7,025,178.09 11,889,672.20   sFT  0.99996329   +0 53 32.8
 HV4196;UTM  18      - 4,311,128.557   320,564.640   MT  0.99999648   -1 18 04.1
 HV4196
 HV4196_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2056411128(NAD 83)
 HV4196
 HV4196                          SUPERSEDED SURVEY CONTROL
 HV4196
 HV4196  NAD 83(1991)-  38 55 50.67643(N)    077 04 12.31377(W) AD(       ) 3
 HV4196  NAD 83(1986)-  38 55 50.67608(N)    077 04 12.32392(W) AD(       ) 3
 HV4196  NAD 27      -  38 55 50.27800(N)    077 04 13.39800(W) AD(       ) 3
 HV4196
 HV4196.Superseded values are not recommended for survey control.
 HV4196
 HV4196.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4196.See file dsdata.pdf to determine how the superseded data were derived.
 HV4196
 HV4196_MARKER: 91 = CHURCH CROSS
 HV4196
 HV4196  HISTORY     - Date     Condition        Report By
 HV4196  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4196  HISTORY     - 19950601 GOOD             USPSQD
 HV4196  HISTORY     - 19950818 GOOD             USPSQD
 HV4196  HISTORY     - 20031220 GOOD             GEOCAC
 HV4196  HISTORY     - 20201110 GOOD             NGS
 HV4196
 HV4196                          STATION DESCRIPTION
 HV4196
 HV4196'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4196'STATION IS THE FINIAL-CROSS ON THE EASTERN END OF THE HIP
 HV4196'ROOF OF THE NATIONAL CATHEDRAL (EPISCOPALIAN) LOCATED NORTHEAST
 HV4196'OF THE INTERSECTION OF MASSACHUSETTS AND WISCONSIN AVENUES,
 HV4196'N.W.
 HV4196
 HV4196                          STATION RECOVERY (1995)
 HV4196
 HV4196'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4196'RECOVERED IN GOOD CONDITION.
 HV4196
 HV4196                          STATION RECOVERY (1995)
 HV4196
 HV4196'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4196'RECOVERED IN GOOD CONDITION.
 HV4196
 HV4196                          STATION RECOVERY (2003)
 HV4196
 HV4196'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV4196'CROSS IS AT THE REAR OF THE CATHEDRAL.
 HV4196
 HV4196                          STATION RECOVERY (2020)
 HV4196
 HV4196'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JH)
 HV4196'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4200 ***********************************************************************
 HV4200  DESIGNATION -  CATHOLIC
 HV4200  PID         -  HV4200
 HV4200  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4200  COUNTRY     -  US
 HV4200  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4200
 HV4200                         *CURRENT SURVEY CONTROL
 HV4200  ______________________________________________________________________
 HV4200* NAD 83(1993) POSITION- 38 58 06.47404(N) 077 04 30.72739(W)   ADJUSTED
 HV4200  ______________________________________________________________________
 HV4200  GEOID HEIGHT    -        -31.921 (meters)                     GEOID18
 HV4200  LAPLACE CORR    -         -2.82  (seconds)                    DEFLEC18
 HV4200  HORZ ORDER      -  THIRD
 HV4200
 HV4200.The horizontal coordinates were established by classical geodetic methods
 HV4200.and adjusted by the National Geodetic Survey in November 1994.
 HV4200
 HV4200.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4200.GEOID18 height accuracy estimate available here.
 HV4200
 HV4200.Click photographs - Photos may exist for this station.
 HV4200
 HV4200.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4200
 HV4200. The following values were computed from the NAD 83(1993) position.
 HV4200
 HV4200;                    North         East     Units Scale Factor Converg.
 HV4200;SPC MD       -   144,508.199   393,482.945   MT  0.99995115   -0 02 49.9
 HV4200;SPC MD       -   474,107.32  1,290,951.96   sFT  0.99995115   -0 02 49.9
 HV4200;SPC VA N     - 2,145,458.636 3,623,470.872   MT  0.99996710   +0 53 21.3
 HV4200;SPC VA N     - 7,038,892.21 11,888,004.02   sFT  0.99996710   +0 53 21.3
 HV4200;UTM  18      - 4,315,325.166   320,216.573   MT  0.99999801   -1 18 19.5
 HV4200
 HV4200_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2021615325(NAD 83)
 HV4200
 HV4200                          SUPERSEDED SURVEY CONTROL
 HV4200
 HV4200  NAD 83(1991)-  38 58 06.47333(N)    077 04 30.72845(W) AD(       ) 3
 HV4200  NAD 83(1986)-  38 58 06.47285(N)    077 04 30.73832(W) AD(       ) 3
 HV4200  NAD 27      -  38 58 06.07600(N)    077 04 31.81600(W) AD(       ) 3
 HV4200
 HV4200.Superseded values are not recommended for survey control.
 HV4200
 HV4200.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4200.See file dsdata.pdf to determine how the superseded data were derived.
 HV4200
 HV4200_MARKER: 82 = FINIAL
 HV4200_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4200+SATELLITE: SATELLITE OBSERVATIONS - April 29, 2010
 HV4200
 HV4200  HISTORY     - Date     Condition        Report By
 HV4200  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4200  HISTORY     - 1971     GOOD             NGS
 HV4200  HISTORY     - 19950601 GOOD             USPSQD
 HV4200  HISTORY     - 20100429 GOOD             GEOCAC
 HV4200
 HV4200                          STATION DESCRIPTION
 HV4200
 HV4200'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4200'STATION IS THE CENTER OF THE FINIAL ON THE SPIRE OF THE BLESSED
 HV4200'SACRAMENT CATHOLIC CHURCH LOCATED JUST S OF THE INTERSECTION OF
 HV4200'WESTERN AVENUE AND QUESADA STREET, E OF CHEVY CHASE CIRCLE, N.W.
 HV4200
 HV4200                          STATION RECOVERY (1971)
 HV4200
 HV4200'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4200'THE STATION IS THE CENTER OF A FINIAL FORMING A CROSS ON THE
 HV4200'TOP OF THE SPIRE ATOP A CUT STONE TOWER, LOCATED NEAR THE
 HV4200'CENTER AND ON THE NORTH SIDE OF BLESSED SACRAMENT CATHOLIC
 HV4200'CHURCH.  THE FINIAL IS ABOUT 80 FEET ABOVE THE GROUND, 65 FEET
 HV4200'SOUTH OF CENTERLINE OF QUESADA ST. NW, AT THE INTERSECTION OF
 HV4200'WESTERN AVE AND QUESADA STREET, 1 BLOCK EAST OF CHEVY CHASE
 HV4200'CIRCLE N.W.
 HV4200'
 HV4200'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DIST. OF
 HV4200'COL.
 HV4200
 HV4200                          STATION RECOVERY (1995)
 HV4200
 HV4200'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4200'RECOVERED IN GOOD CONDITION.
 HV4200
 HV4200                          STATION RECOVERY (2010)
 HV4200
 HV4200'RECOVERY NOTE BY GEOCACHING 2010 (JA)
 HV4200'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4007 ***********************************************************************
 HV4007  DESIGNATION -  CATHOLIC UNIVERSITY
 HV4007  PID         -  HV4007
 HV4007  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4007  COUNTRY     -  US
 HV4007  USGS QUAD   -  WASHINGTON EAST (2016)
 HV4007
 HV4007                         *CURRENT SURVEY CONTROL
 HV4007  ______________________________________________________________________
 HV4007* NAD 83(1993) POSITION- 38 56 15.15795(N) 076 59 59.43016(W)   ADJUSTED
 HV4007* NAVD 88 ORTHO HEIGHT -    69.    (meters)      226.    (feet) SCALED
 HV4007  ______________________________________________________________________
 HV4007  GEOID HEIGHT    -        -32.052 (meters)                     GEOID18
 HV4007  LAPLACE CORR    -         -3.30  (seconds)                    DEFLEC18
 HV4007  HORZ ORDER      -  SECOND
 HV4007
 HV4007.The horizontal coordinates were established by classical geodetic methods
 HV4007.and adjusted by the National Geodetic Survey in November 1994.
 HV4007
 HV4007.The orthometric height was scaled from a topographic map.
 HV4007
 HV4007.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4007.GEOID18 height accuracy estimate available here.
 HV4007
 HV4007.Click photographs - Photos may exist for this station.
 HV4007
 HV4007.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4007
 HV4007. The following values were computed from the NAD 83(1993) position.
 HV4007
 HV4007;                    North         East     Units Scale Factor Converg.
 HV4007;SPC MD       -   141,072.987   400,013.723   MT  0.99995043   +0 00 00.4
 HV4007;SPC MD       -   462,836.96  1,312,378.36   sFT  0.99995043   +0 00 00.4
 HV4007;SPC VA N     - 2,142,130.553 3,630,057.010   MT  0.99996395   +0 56 10.6
 HV4007;SPC VA N     - 7,027,973.32 11,909,612.04   sFT  0.99996395   +0 56 10.6
 HV4007;UTM  18      - 4,311,747.313   326,670.589   MT  0.99996995   -1 15 25.8
 HV4007
 HV4007!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4007!SPC MD       -   0.99999424  x   0.99995043  =   0.99994467
 HV4007!SPC VA N     -   0.99999424  x   0.99996395  =   0.99995819
 HV4007!UTM  18      -   0.99999424  x   0.99996995  =   0.99996419
 HV4007
 HV4007:                Primary Azimuth Mark                     Grid Az
 HV4007:SPC MD       -  CATHOLIC UNIVERSITY AZ MK                051 28 37.0
 HV4007:SPC VA N     -  CATHOLIC UNIVERSITY AZ MK                050 32 26.8
 HV4007:UTM  18      -  CATHOLIC UNIVERSITY AZ MK                052 44 03.2
 HV4007
 HV4007_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2667011747(NAD 83)
 HV4007
 HV4007|---------------------------------------------------------------------|
 HV4007| PID    Reference Object                     Distance      Geod. Az  |
 HV4007|                                                           dddmmss.s |
 HV4007| DC6791 CATHOLIC UNIVERSITY AZ MK                          0512837.4 |
 HV4007| DC6794 CATHOLIC UNIVERSITY RM 3              9.950 METERS 17349     |
 HV4007| DC6793 CATHOLIC UNIVERSITY RM 2             55.440 METERS 19053     |
 HV4007| DC6792 CATHOLIC UNIVERSITY RM 1             33.842 METERS 33618     |
 HV4007|---------------------------------------------------------------------|
 HV4007
 HV4007                          SUPERSEDED SURVEY CONTROL
 HV4007
 HV4007  NAD 83(1991)-  38 56 15.15712(N)    076 59 59.43097(W) AD(       ) 2
 HV4007  NAD 83(1986)-  38 56 15.15640(N)    076 59 59.44150(W) AD(       ) 2
 HV4007  NAD 27      -  38 56 14.75800(N)    077 00 00.52500(W) AD(       ) 2
 HV4007
 HV4007.Superseded values are not recommended for survey control.
 HV4007
 HV4007.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4007.See file dsdata.pdf to determine how the superseded data were derived.
 HV4007
 HV4007_MARKER: DS = TRIANGULATION STATION DISK
 HV4007_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV4007_STAMPING: CATHOLIC U 1934
 HV4007_MARK LOGO: CGS
 HV4007_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV4007+STABILITY: SURFACE MOTION
 HV4007
 HV4007  HISTORY     - Date     Condition        Report By
 HV4007  HISTORY     - 1934     MONUMENTED       CGS
 HV4007  HISTORY     - 1940     GOOD             CGS
 HV4007  HISTORY     - 1960     GOOD             MADHOP
 HV4007  HISTORY     - 1971     GOOD             NGS
 HV4007
 HV4007                          STATION DESCRIPTION
 HV4007
 HV4007'DESCRIBED BY COAST AND GEODETIC SURVEY 1934 (JB)
 HV4007'STATION IS LOCATED ON THE GROUNDS OF THE CATHOLIC UNIVERSITY
 HV4007'OF AMERICA 25.3 FEET S FROM THE FENCE LINE DIVIDING THE
 HV4007'PROPERTIES OF THE CATHOLIC UNIVERSITY AND THOSE OF MARIST
 HV4007'COLLEGE, 119.2 FEET E FROM THE CENTER OF THE E POST AT THE
 HV4007'MAIN ENTRANCE TO MARIST COLLEGE.  IT IS AT THE N EDGE OF THE
 HV4007'BASEBALL DIAMOND IN BACK OF CALDWELL HALL.
 HV4007'
 HV4007'SURFACE, UNDERGROUND, AND REFERENCE MARKS ARE STANDARD
 HV4007'BRONZE DISKS SET IN CONCRETE.
 HV4007'
 HV4007'REFERENCE MARK NO. 1 IS 110.90 FEET E FROM STATION, 15 FEET
 HV4007'NE FROM 24-INCH OAK TREE, AND 5 FEET W FROM A 10-INCH OAK
 HV4007'TREE.
 HV4007'
 HV4007'REFERENCE MARK NO. 2 IS 181.89 FEET NW FROM STATION, 33 PACES
 HV4007'N FROM THE ENTRANCE GATE TO MARIST COLLEGE, AND 9 FEET E FROM
 HV4007'THE CENTER OF THE ROAD GOING INTO THE COLLEGE.
 HV4007'
 HV4007'AZIMUTH MARK IS LOCATED ABOUT 2 MILES ENE FROM THE STATION
 HV4007'ON THE GROUNDS OF THE CHRISTIAN BROTHERS DE LA SALLE SCHOOL.
 HV4007'IT IS 55 FEET W FROM THE NW CORNER OF THE BUILDING AT THE TOP
 HV4007'OF TERRACE.
 HV4007'
 HV4007'TO REACH AZIMUTH MARK GO E ON MICHIGAN AVENUE TO QUEENS
 HV4007'CHAPEL ROAD, TURN LEFT ON QUEENS CHAPEL ROAD AND GO OUT TO
 HV4007'THE DISTRICT OF COLUMBIA-MARYLAND LINE.  HERE TURN LEFT ON
 HV4007'DIRT ROAD AND GO 0.2 MILE TO THE COLLEGE AND MARK.
 HV4007'
 HV4007'HEIGHT OF LIGHT ABOVE STATION MARK - 35 METERS.
 HV4007
 HV4007                          STATION RECOVERY (1940)
 HV4007
 HV4007'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV4007'STATION AND AZIMUTH MARKS RECOVERED IN GOOD CONDITION.
 HV4007'
 HV4007'REFERENCE MARKS WERE NOT SEARCHED FOR.  THE FIRST PARAGRAPH
 HV4007'OF THE 1934 DESCRIPTION OF THIS STATION SHOULD BE CHANGED
 HV4007'TO READ AS FOLLOWS--
 HV4007'
 HV4007'STATION IS LOCATED IN THE NORTHERN PART OF THE GROUNDS OF
 HV4007'THE CATHOLIC UNIVERSITY OF AMERICA, 25.3 FEET S FROM THE FENCE
 HV4007'LINE DIVIDING THE PROPERTIES OF THE CATHOLIC UNIVERSITY
 HV4007'FROM THOSE OF THE MARIST COLLEGE, 119.2 FEET E OF THE CENTER
 HV4007'OF THE E GATEPOST AT THE S END OF THE DRIVEWAY WHICH IS THE
 HV4007'MAIN ENTRANCE TO AND IS S OF THE MAIN BUILDING OF THE MARIST
 HV4007'COLLEGE.
 HV4007'
 HV4007'THE FIELD WHICH CONTAINS THE MARK IS IN THE BACK OF CALDWELL
 HV4007'HALL OF THE CATHOLIC UNIVERSITY, AND WAS FORMERLY AN ATHLETIC
 HV4007'FIELD, BUT AT THE PRESENT TIME IS NOT IN USE, AS SUCH, AND
 HV4007'PROBABLY AWAITS USE AS A SITE FOR ADDITIONAL BUILDINGS OF THE
 HV4007'CATHOLIC UNIVERSITY.
 HV4007
 HV4007                          STATION RECOVERY (1960)
 HV4007
 HV4007'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4007'STATION AND REFERENCE MARK 2 RECOVERED AS DESCRIBED.
 HV4007'
 HV4007'NOTE--THE DIRECTIONS SHOWN ON THE DESCRIPTION CARD WERE
 HV4007'APPARENTLY INITIALED ON STATION HOME INSTEAD OF INSANE.
 HV4007
 HV4007                          STATION RECOVERY (1971)
 HV4007
 HV4007'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4007'STATION WAS RECOVERED AND ALL MARKS FOUND IN GOOD CONDITION
 HV4007'EXCEPT R.M. NO. 2, WHICH HAS APPARENTLY BEEN DESTROYED.  A
 HV4007'NEW REFERENCE MARK, NO. 3, WAS ESTABLISHED.  THE AZIMUTH
 HV4007'MARK IS NOW BLOCKED AT BOTH ENDS BY TREES.  A DIFFERENCE OF
 HV4007'0.13 FT. WAS NOTED IN THE DISTANCE TO R.M. NO. 1.  THE
 HV4007'ANGLE LISTED IN THE OLD DESCRIPTION TO THE AZIMUTH MARK
 HV4007'APPEARS TO BE CORRECT, HOWEVER THE ANGLE LISTED TO R.M. NO. 1
 HV4007'IS ERRONEOUS.  IT IS BELIEVED THAT THIS ANGLE WAS MEASURED
 HV4007'FROM STATION HOME 1912 (THIS GIVES A CHECK OF 3 FT 12 IN
 HV4007'LOWER THAN THE ABOVE OBSERVED ANGLE).  A COMPLETE DESCRIPTION
 HV4007'FOLLOWS--
 HV4007'
 HV4007'STATION IS LOCATED AT THE NORTHERN END OF THE GROUNDS OF THE
 HV4007'CATHOLIC UNIVERSITY, ON A LAWN TERRACE AT NORTHEAST CORNER OF
 HV4007'LARGE PLAYFIELD LAWN, JUST SOUTH OF THE LINE BETWEEN CATHOLIC
 HV4007'UNIVERSITY AND MARIST COLLEGE.  STATION MARK IS A STANDARD
 HV4007'DISK STAMPED CATHOLIC U 1934, SET IN THE TOP OF A 10-INCH-SQUARE,
 HV4007'CONCRETE MONUMENT PROJECTING 4 INCHES FROM GROUND.  IT IS 38
 HV4007'FEET SOUTH OF CENTER LINE OF MACADAM DRIVE ALONG SOUTH SIDE OF
 HV4007'THE MARIST COLLEGE LAWN, 118 FEET EAST OF THE EAST ONE OF TWO
 HV4007'LARGE CONCRETE GATEPOSTS AND 43 FEET NORTHWEST OF NORTHWEST
 HV4007'CORNER OF OLD BRICK FOUNDATION 4 FEET SQUARE AND 2 FEET
 HV4007'HIGH.
 HV4007'
 HV4007'REFERENCE MARK NUMBER ONE IS A STANDARD DISK STAMPED CATHOLIC
 HV4007'U NO 1 1934, SET IN THE TOP OF A 10-INCH-SQUARE, CONCRETE
 HV4007'MONUMENT PROJECTING 4 INCHES FROM GROUND, LOCATED IN TREES,
 HV4007'31 FEET NORTHEAST OF EDGE OF LAWN, 15 FEET WEST OF EDGE OF
 HV4007'TERRACE AND 1.1 FEET LOWER THAN STATION.
 HV4007'
 HV4007'REFERENCE MARK NUMBER THREE IS A STANDARD DISK STAMPED CATHOLIC
 HV4007'U 1934 NO 3 1971, SET IN THE TOP OF A 10-INCH-DIAMETER,
 HV4007'CONCRETE MONUMENT PROJECTING 1 INCH FROM GROUND, LOCATED
 HV4007'AT NORTH END OF TREE ROW BETWEEN 2 LANWS, 23 FEET SOUTH OF CENTER
 HV4007'LINE OF MACADAM DRIVEWAY.
 HV4007'
 HV4007'AZIMUTH MARK IS A STANDARD REFERENCE MARK DISK STAMPED
 HV4007'CATHOLIC U AZ MARK 1934, SET IN THE TOP OF A 10-INCH-SQUARE,
 HV4007'CONCRETE MONUMENT FLUSH WITH THE TOP OF A LARGE CONCRETE
 HV4007'PAD WHICH HAS BEEN BUILT AROUND IT, FOR RUBBISH CONTAINERS.
 HV4007'IT IS 16 INCHES EAST OF WEST EDGE OF THE PAD, 8 FEET SOUTH
 HV4007'OF NORTHWEST CORNER OF PAD, 62 FEET WEST OF THE NORTHWEST CORNER
 HV4007'OF THE OLD CHRISTIAN BROTHERS SCHOOL, AND AT NORTH SIDE OF
 HV4007'THE MACADAM DRIVE, AT TOP OF GRADE.
 HV4007'
 HV4007'MARIST COLLEGE CROSS IS A SMALL, GREY, CONCRETE CROSS, ATOP
 HV4007'THE GABLE ROOF OF THE CUPOLA HOUSING A LARGE STATUE ABOVE
 HV4007'ENTRANCE TO THE COLLEGE.
 HV4007'
 HV4007'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN NE
 HV4007'PART OF DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV3995 ***********************************************************************
 HV3995  DESIGNATION -  CAUSTEN
 HV3995  PID         -  HV3995
 HV3995  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV3995  COUNTRY     -  US
 HV3995  USGS QUAD   -  WASHINGTON WEST (2016)
 HV3995
 HV3995                         *CURRENT SURVEY CONTROL
 HV3995  ______________________________________________________________________
 HV3995* NAD 83(1993) POSITION- 38 55 35.36185(N) 077 04 22.89662(W)   ADJUSTED
 HV3995* NAVD 88 ORTHO HEIGHT -   107.    (meters)      351.    (feet) SCALED
 HV3995  ______________________________________________________________________
 HV3995  GEOID HEIGHT    -        -31.972 (meters)                     GEOID18
 HV3995  LAPLACE CORR    -         -2.91  (seconds)                    DEFLEC18
 HV3995  HORZ ORDER      -  SECOND
 HV3995
 HV3995.The horizontal coordinates were established by classical geodetic methods
 HV3995.and adjusted by the National Geodetic Survey in November 1994.
 HV3995
 HV3995.The orthometric height was scaled from a topographic map.
 HV3995
 HV3995.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV3995.GEOID18 height accuracy estimate available here.
 HV3995
 HV3995.Click photographs - Photos may exist for this station.
 HV3995
 HV3995.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV3995
 HV3995. The following values were computed from the NAD 83(1993) position.
 HV3995
 HV3995;                    North         East     Units Scale Factor Converg.
 HV3995;SPC MD       -   139,848.377   393,667.723   MT  0.99995024   -0 02 45.0
 HV3995;SPC MD       -   458,819.22  1,291,558.19   sFT  0.99995024   -0 02 45.0
 HV3995;SPC VA N     - 2,140,802.390 3,623,731.785   MT  0.99996289   +0 53 26.2
 HV3995;SPC VA N     - 7,023,615.84 11,888,860.03   sFT  0.99996289   +0 53 26.2
 HV3995;UTM  18      - 4,310,662.191   320,299.036   MT  0.99999765   -1 18 10.4
 HV3995
 HV3995!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV3995!SPC MD       -   0.99998826  x   0.99995024  =   0.99993850
 HV3995!SPC VA N     -   0.99998826  x   0.99996289  =   0.99995115
 HV3995!UTM  18      -   0.99998826  x   0.99999765  =   0.99998591
 HV3995
 HV3995:                Primary Azimuth Mark                     Grid Az
 HV3995:SPC MD       -  CAPITOL STATUE OF FREEDOM HEAD           126 18 02.4
 HV3995:SPC VA N     -  CAPITOL STATUE OF FREEDOM HEAD           125 21 51.2
 HV3995:UTM  18      -  CAPITOL STATUE OF FREEDOM HEAD           127 33 27.8
 HV3995
 HV3995_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2029910662(NAD 83)
 HV3995
 HV3995|---------------------------------------------------------------------|
 HV3995| PID    Reference Object                     Distance      Geod. Az  |
 HV3995|                                                           dddmmss.s |
 HV3995| DC6795 CAUSTEN AZ MK                                      0305257.1 |
 HV3995| HV4150 CAPITOL STATUE OF FREEDOM HEAD      APPROX. 6.9 KM 1261517.4 |
 HV3995|---------------------------------------------------------------------|
 HV3995
 HV3995                          SUPERSEDED SURVEY CONTROL
 HV3995
 HV3995  NAD 83(1991)-  38 55 35.36107(N)    077 04 22.89736(W) AD(       ) 2
 HV3995  NAD 83(1986)-  38 55 35.36046(N)    077 04 22.90770(W) AD(       ) 2
 HV3995  NAD 27      -  38 55 34.96000(N)    077 04 23.98000(W) AD(       ) 2
 HV3995  USBS        -  38 55 31.96000(N)    077 04 05.29000(W) AD(       ) 3
 HV3995  USSD        -  38 55 35.29300(N)    077 04 23.81200(W) AD(       ) 3
 HV3995
 HV3995.Superseded values are not recommended for survey control.
 HV3995
 HV3995.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV3995.See file dsdata.pdf to determine how the superseded data were derived.
 HV3995
 HV3995
 HV3995  HISTORY     - Date     Condition        Report By
 HV3995  HISTORY     - 1851     MONUMENTED       COASUR
 HV3995  HISTORY     - 1868     GOOD             COASUR
 HV3995  HISTORY     - 1927     MARK NOT FOUND   PBPP
 HV3995
 HV3995                          STATION DESCRIPTION
 HV3995
 HV3995'DESCRIBED BY COAST SURVEY (CGS) 1868
 HV3995'THIS STATION IS ON THE SUMMIT OF CAUSTENS HILL, ON THE E SIDE OF
 HV3995'THE GEORGETOWN-ROCKVILLE ROAD (WISCONSIN AVENUE).  THE STATION IS
 HV3995'MARKED BY A DRILL HOLE IN THE CENTER OF THE TOP OF A 5-INCH STONE
 HV3995'POST SUNK 2 FEET INTO THE GROUND.  THREE SIMILAR STONES WITH
 HV3995'DIAGONAL GROOVES WERE PLACED 5 FEET FROM THE STATION,
 HV3995'RESPECTIVELY, N, E AND S.
 HV3995
 HV3995                          STATION RECOVERY (1927)
 HV3995
 HV3995'RECOVERY NOTE BY PUB BLDGS AND PARKS 1927
 HV3995'STATION LOST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9344 ***********************************************************************
 HV9344  DESIGNATION -  CENTER OF CRYPT
 HV9344  PID         -  HV9344
 HV9344  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9344  COUNTRY     -  US
 HV9344  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9344
 HV9344                         *CURRENT SURVEY CONTROL
 HV9344  ______________________________________________________________________
 HV9344* NAD 83(1993) POSITION- 38 53 23.31598(N) 077 00 32.61583(W)   ADJUSTED
 HV9344* NAVD 88 ORTHO HEIGHT -    28.2   (meters)       93.    (feet) VERT ANG
 HV9344  ______________________________________________________________________
 HV9344  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 HV9344  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9344  HORZ ORDER      -  THIRD
 HV9344
 HV9344.The horizontal coordinates were established by classical geodetic methods
 HV9344.and adjusted by the National Geodetic Survey in November 1994.
 HV9344
 HV9344.The orthometric height was determined by vertical angle observations.
 HV9344
 HV9344.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9344.GEOID18 height accuracy estimate available here.
 HV9344
 HV9344.Click photographs - Photos may exist for this station.
 HV9344
 HV9344.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9344
 HV9344. The following values were computed from the NAD 83(1993) position.
 HV9344
 HV9344;                    North         East     Units Scale Factor Converg.
 HV9344;SPC MD       -   135,774.169   399,213.992   MT  0.99994988   -0 00 20.5
 HV9344;SPC MD       -   445,452.42  1,309,754.57   sFT  0.99994988   -0 00 20.5
 HV9344;SPC VA N     - 2,136,819.314 3,629,343.954   MT  0.99995965   +0 55 49.9
 HV9344;SPC VA N     - 7,010,548.03 11,907,272.62   sFT  0.99995965   +0 55 49.9
 HV9344;UTM  18      - 4,306,467.193   325,754.826   MT  0.99997387   -1 15 42.0
 HV9344
 HV9344!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9344!SPC MD       -   1.00000062  x   0.99994988  =   0.99995050
 HV9344!SPC VA N     -   1.00000062  x   0.99995965  =   0.99996027
 HV9344!UTM  18      -   1.00000062  x   0.99997387  =   0.99997449
 HV9344
 HV9344_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2575406467(NAD 83)
 HV9344
 HV9344                          SUPERSEDED SURVEY CONTROL
 HV9344
 HV9344  NAD 83(1991)-  38 53 23.31666(N)    077 00 32.61585(W) AD(       ) 3
 HV9344
 HV9344.Superseded values are not recommended for survey control.
 HV9344
 HV9344.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9344.See file dsdata.pdf to determine how the superseded data were derived.
 HV9344
 HV9344_MARKER: DD = SURVEY DISK
 HV9344_SETTING: 0 = UNSPECIFIED SETTING
 HV9344_MARK LOGO: NGS
 HV9344_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9344_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9344_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9344+SATELLITE: SATELLITE OBSERVATIONS - June 15, 2010
 HV9344
 HV9344  HISTORY     - Date     Condition        Report By
 HV9344  HISTORY     - 1992     MONUMENTED       NGS
 HV9344  HISTORY     - 20090319 GOOD             GEOCAC
 HV9344  HISTORY     - 20100615 GOOD             GEOCAC
 HV9344
 HV9344                          STATION DESCRIPTION
 HV9344
 HV9344'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9344'STATION IS THE CENTER OF THE 20 POINT WHITE MARBLE STAR IN THE CENTER
 HV9344'OF THE FIRST FLOOR OF THE CAPITOL BENEATH THE ROTUNDA AT THE
 HV9344'INTERSECTION OF THE NORTH-SOUTH AND EAST-WEST HALLWAYS.  THE STATION
 HV9344'IS MARKED BY A ONE MILLIMETER BLACK SPOT IN THE CENTER OF THE STAR
 HV9344'2.77 METERS (9.09 FT) INSIDE A CIRCLE OF MARBLE PILLARS.
 HV9344
 HV9344                          STATION RECOVERY (2009)
 HV9344
 HV9344'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV9344'RECOVERED IN GOOD CONDITION.
 HV9344
 HV9344                          STATION RECOVERY (2010)
 HV9344
 HV9344'RECOVERY NOTE BY GEOCACHING 2010 (JA)
 HV9344'FOUND IN GOOD CONDITION. ROOM WHERE BENCHMARK IS LOCATED IS NOW PART
 HV9344'OF THE PUBLIC CAPITOL TOUR. THE 1 MM BLACK DOT HAS BEEN WORN AWAY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9345 ***********************************************************************
 HV9345  DESIGNATION -  CENTER OF GRATE
 HV9345  PID         -  HV9345
 HV9345  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9345  COUNTRY     -  US
 HV9345  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9345
 HV9345                         *CURRENT SURVEY CONTROL
 HV9345  ______________________________________________________________________
 HV9345* NAD 83(1993) POSITION- 38 53 24.14015(N) 077 00 32.61493(W)   ADJUSTED
 HV9345* NAVD 88 ORTHO HEIGHT -    28.    (meters)       92.    (feet) VERT ANG
 HV9345  ______________________________________________________________________
 HV9345  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 HV9345  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 HV9345  HORZ ORDER      -  THIRD
 HV9345
 HV9345.The horizontal coordinates were established by classical geodetic methods
 HV9345.and adjusted by the National Geodetic Survey in November 1994.
 HV9345
 HV9345.The orthometric height was determined by vertical angle observations.
 HV9345
 HV9345.No vertical observational check was made to the station.
 HV9345
 HV9345.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9345.GEOID18 height accuracy estimate available here.
 HV9345
 HV9345.Click photographs - Photos may exist for this station.
 HV9345
 HV9345.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9345
 HV9345. The following values were computed from the NAD 83(1993) position.
 HV9345
 HV9345;                    North         East     Units Scale Factor Converg.
 HV9345;SPC MD       -   135,799.583   399,214.017   MT  0.99994988   -0 00 20.5
 HV9345;SPC MD       -   445,535.80  1,309,754.65   sFT  0.99994988   -0 00 20.5
 HV9345;SPC VA N     - 2,136,844.725 3,629,343.563   MT  0.99995967   +0 55 49.9
 HV9345;SPC VA N     - 7,010,631.40 11,907,271.34   sFT  0.99995967   +0 55 49.9
 HV9345;UTM  18      - 4,306,492.601   325,755.407   MT  0.99997387   -1 15 42.0
 HV9345
 HV9345!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9345!SPC MD       -   1.00000061  x   0.99994988  =   0.99995049
 HV9345!SPC VA N     -   1.00000061  x   0.99995967  =   0.99996028
 HV9345!UTM  18      -   1.00000061  x   0.99997387  =   0.99997448
 HV9345
 HV9345_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2575506492(NAD 83)
 HV9345
 HV9345                          SUPERSEDED SURVEY CONTROL
 HV9345
 HV9345  NAD 83(1991)-  38 53 24.14084(N)    077 00 32.61493(W) AD(       ) 3
 HV9345
 HV9345.Superseded values are not recommended for survey control.
 HV9345
 HV9345.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9345.See file dsdata.pdf to determine how the superseded data were derived.
 HV9345
 HV9345_MARKER: Z = SEE DESCRIPTION
 HV9345_SETTING: 0 = UNSPECIFIED SETTING
 HV9345_MARK LOGO: NGS
 HV9345_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9345_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9345_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9345+SATELLITE: SATELLITE OBSERVATIONS - June 17, 2010
 HV9345
 HV9345  HISTORY     - Date     Condition        Report By
 HV9345  HISTORY     - 1992     MONUMENTED       NGS
 HV9345  HISTORY     - 20090319 GOOD             GEOCAC
 HV9345  HISTORY     - 20100617 GOOD             GEOCAC
 HV9345
 HV9345                          STATION DESCRIPTION
 HV9345
 HV9345'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9345'STATION IS LOCATED ON THE FIRST FLOOR OF THE CAPITOL IN THE SENATE
 HV9345'WING AND IS MARKED BY THE CENTER OF A BRASS GRATE LOCATED IN THE
 HV9345'SMALL ROTUNA ALONG THE MAIN NORTH-SOUTH HALLWAY OF THE CAPITOL AND
 HV9345'JUST NORTH OF THE CRYPT.
 HV9345
 HV9345                          STATION RECOVERY (2009)
 HV9345
 HV9345'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV9345'RECOVERED IN GOOD CONDITION.
 HV9345
 HV9345                          STATION RECOVERY (2010)
 HV9345
 HV9345'RECOVERY NOTE BY GEOCACHING 2010 (JA)
 HV9345'RECOVERED IN GOOD CONDITION. TO ACCESS THIS BENCHMARK, YOU NEED TO
 HV9345'ARRANGE FOR A GUIDED TOUR THROUGH EITHER YOUR SENATOR'S OR
 HV9345'CONGRESSMAN'S OFFICE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7573 ***********************************************************************
 HV7573  DESIGNATION -  CHICAGO USE 1923
 HV7573  PID         -  HV7573
 HV7573  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7573  COUNTRY     -  US
 HV7573  USGS QUAD   -  ANACOSTIA (2016)
 HV7573
 HV7573                         *CURRENT SURVEY CONTROL
 HV7573  ______________________________________________________________________
 HV7573* NAD 83(1993) POSITION- 38 52 06.66423(N) 076 59 34.98938(W)   ADJUSTED
 HV7573* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV7573  ______________________________________________________________________
 HV7573  GEOID HEIGHT    -        -32.194 (meters)                     GEOID18
 HV7573  LAPLACE CORR    -         -3.03  (seconds)                    DEFLEC18
 HV7573  HORZ ORDER      -  THIRD
 HV7573
 HV7573.The horizontal coordinates were established by classical geodetic methods
 HV7573.and adjusted by the National Geodetic Survey in November 1994.
 HV7573
 HV7573.The orthometric height was scaled from a topographic map.
 HV7573
 HV7573.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7573.GEOID18 height accuracy estimate available here.
 HV7573
 HV7573.Click photographs - Photos may exist for this station.
 HV7573
 HV7573.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7573
 HV7573. The following values were computed from the NAD 83(1993) position.
 HV7573
 HV7573;                    North         East     Units Scale Factor Converg.
 HV7573;SPC MD       -   133,410.562   400,602.910   MT  0.99994986   +0 00 15.7
 HV7573;SPC MD       -   437,697.82  1,314,311.38   sFT  0.99994986   +0 00 15.7
 HV7573;SPC VA N     - 2,134,478.694 3,630,771.317   MT  0.99995796   +0 56 25.8
 HV7573;SPC VA N     - 7,002,868.85 11,911,955.56   sFT  0.99995796   +0 56 25.8
 HV7573;UTM  18      - 4,304,073.666   327,091.642   MT  0.99996816   -1 15 03.7
 HV7573
 HV7573!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7573!SPC MD       -   1.00000493  x   0.99994986  =   0.99995479
 HV7573!SPC VA N     -   1.00000493  x   0.99995796  =   0.99996289
 HV7573!UTM  18      -   1.00000493  x   0.99996816  =   0.99997309
 HV7573
 HV7573:                Primary Azimuth Mark                     Grid Az
 HV7573:SPC MD       -  BRIDGE USE 1923                          021 50 24.5
 HV7573:SPC VA N     -  BRIDGE USE 1923                          020 54 14.4
 HV7573:UTM  18      -  BRIDGE USE 1923                          023 05 43.9
 HV7573
 HV7573_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2709104073(NAD 83)
 HV7573
 HV7573|---------------------------------------------------------------------|
 HV7573| PID    Reference Object                     Distance      Geod. Az  |
 HV7573|                                                           dddmmss.s |
 HV7573| HV7558 BRIDGE USE 1923                     441.721 METERS 0215040.2 |
 HV7573| HV7560 RAY USE 1923                        369.458 METERS 06916     |
 HV7573| HV7566 STICKFOOT USE 1923                  347.198 METERS 27535     |
 HV7573| HV7568 SLIP USE 1923                       368.503 METERS 34120     |
 HV7573|---------------------------------------------------------------------|
 HV7573
 HV7573                          SUPERSEDED SURVEY CONTROL
 HV7573
 HV7573  NAD 83(1991)-  38 52 06.66282(N)    076 59 34.99060(W) AD(       ) 3
 HV7573  NAD 83(1986)-  38 52 06.66230(N)    076 59 35.00178(W) AD(       ) 3
 HV7573  NAD 27      -  38 52 06.25900(N)    076 59 36.08900(W) AD(       ) 3
 HV7573
 HV7573.Superseded values are not recommended for survey control.
 HV7573
 HV7573.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7573.See file dsdata.pdf to determine how the superseded data were derived.
 HV7573
 HV7573
 HV7573  HISTORY     - Date     Condition        Report By
 HV7573  HISTORY     - 1923     MONUMENTED       CGS
 HV7573  HISTORY     - 1958     MARK NOT FOUND   CGS
 HV7573
 HV7573                          STATION DESCRIPTION
 HV7573
 HV7573'DESCRIBED BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7573'A THOROUGH SEARCH WAS MADE ALONG THE SEA WALL FOR THIS UNDESCRIBED
 HV7573'STATION WITHOUT RESULTS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1409 ***********************************************************************
 HV1409  DESIGNATION -  CHISELED SQUARE
 HV1409  PID         -  HV1409
 HV1409  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1409  COUNTRY     -  US
 HV1409  USGS QUAD   -  ANACOSTIA (2016)
 HV1409
 HV1409                         *CURRENT SURVEY CONTROL
 HV1409  ______________________________________________________________________
 HV1409* NAD 83(1986) POSITION- 38 52 25.     (N) 076 59 42.     (W)   SCALED
 HV1409* NAVD 88 ORTHO HEIGHT -     3.52  (+/-2cm)       11.5   (feet) VERTCON3
 HV1409  ______________________________________________________________________
 HV1409  GEOID HEIGHT    -        -32.183 (meters)                     GEOID18
 HV1409  VERT ORDER      -  ? (See Below)
 HV1409
 HV1409.The horizontal coordinates were scaled from a map and have
 HV1409.an estimated accuracy of +/- 6 seconds.
 HV1409
 HV1409.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1409.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1409
 HV1409.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1409.GEOID18 height accuracy estimate available here.
 HV1409
 HV1409.The vertical order pertains to the NGVD 29 superseded value.
 HV1409
 HV1409.Click photographs - Photos may exist for this station.
 HV1409
 HV1409
 HV1409_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ269046(NAD 83)
 HV1409
 HV1409                          SUPERSEDED SURVEY CONTROL
 HV1409
 HV1409  NGVD 29 (11/26/84)    3.762  (m)           12.34   (f) ADJUSTED       
 HV1409
 HV1409.Superseded values are not recommended for survey control.
 HV1409
 HV1409.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1409.See file dsdata.pdf to determine how the superseded data were derived.
 HV1409
 HV1409_MARKER: Q = CHISELED SQUARE
 HV1409_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1409_SP_SET: STONE SILL
 HV1409_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1409
 HV1409  HISTORY     - Date     Condition        Report By
 HV1409  HISTORY     - UNK      MONUMENTED       CGS
 HV1409  HISTORY     - 1923     GOOD             CGS
 HV1409
 HV1409                          STATION DESCRIPTION
 HV1409
 HV1409'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1409'IN WASHINGTON.
 HV1409'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN
 HV1409'FACTORY, ON THE WEST SIDE OF THE BUILDING EAST OF THE
 HV1409'CARTRIDGE-CASE SHOP, AND ON THE STONE SILL OF THE SOUTH DOOR.
 HV1409'A CHISELED SQUARE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4233 ***********************************************************************
 HV4233  DESIGNATION -  CHRISTIAN CHURCH SPIRE
 HV4233  PID         -  HV4233
 HV4233  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4233  COUNTRY     -  US
 HV4233  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4233
 HV4233                         *CURRENT SURVEY CONTROL
 HV4233  ______________________________________________________________________
 HV4233* NAD 83(1993) POSITION- 38 54 22.61717(N) 077 01 56.69634(W)   ADJUSTED
 HV4233  ______________________________________________________________________
 HV4233  GEOID HEIGHT    -        -32.058 (meters)                     GEOID18
 HV4233  LAPLACE CORR    -         -2.34  (seconds)                    DEFLEC18
 HV4233  HORZ ORDER      -  THIRD
 HV4233
 HV4233.The horizontal coordinates were established by classical geodetic methods
 HV4233.and adjusted by the National Geodetic Survey in November 1994.
 HV4233
 HV4233.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4233.GEOID18 height accuracy estimate available here.
 HV4233
 HV4233.Click photographs - Photos may exist for this station.
 HV4233
 HV4233.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4233
 HV4233. The following values were computed from the NAD 83(1993) position.
 HV4233
 HV4233;                    North         East     Units Scale Factor Converg.
 HV4233;SPC MD       -   137,603.214   397,188.389   MT  0.99994999   -0 01 13.2
 HV4233;SPC MD       -   451,453.21  1,303,108.91   sFT  0.99994999   -0 01 13.2
 HV4233;SPC VA N     - 2,138,615.035 3,627,288.713   MT  0.99996105   +0 54 57.4
 HV4233;SPC VA N     - 7,016,439.49 11,900,529.72   sFT  0.99996105   +0 54 57.4
 HV4233;UTM  18      - 4,308,340.259   323,769.752   MT  0.99998244   -1 16 36.4
 HV4233
 HV4233_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2376908340(NAD 83)
 HV4233
 HV4233                          SUPERSEDED SURVEY CONTROL
 HV4233
 HV4233  NAD 83(1991)-  38 54 22.61637(N)    077 01 56.69753(W) AD(       ) 3
 HV4233  NAD 83(1986)-  38 54 22.61622(N)    077 01 56.70794(W) AD(       ) 3
 HV4233  NAD 27      -  38 54 22.22000(N)    077 01 57.79000(W) AD(       ) 3
 HV4233
 HV4233.Superseded values are not recommended for survey control.
 HV4233
 HV4233.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4233.See file dsdata.pdf to determine how the superseded data were derived.
 HV4233
 HV4233_MARKER: 90 = CHURCH SPIRE
 HV4233_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4233+SATELLITE: SATELLITE OBSERVATIONS - July 18, 2005
 HV4233
 HV4233  HISTORY     - Date     Condition        Report By
 HV4233  HISTORY     - 1934     FIRST OBSERVED   CGS
 HV4233  HISTORY     - 20030529 GOOD             GEOCAC
 HV4233  HISTORY     - 20050718 GOOD             USPSQD
 HV4233  HISTORY     - 20201104 GOOD             NGS
 HV4233
 HV4233                          STATION DESCRIPTION
 HV4233
 HV4233'DESCRIBED BY GEOCACHING 2003 (APC)
 HV4233'NATIONAL CITY CHRISTIAN CHURCH IS LOCATED AT 5 THOMAS CIRCLE, AT THE
 HV4233'NORTHEAST PORTION OF THE CIRCLE BETWEEN 14TH STREET AND MASSACHUSETTS
 HV4233'AVE., NW
 HV4233
 HV4233                          STATION RECOVERY (2005)
 HV4233
 HV4233'RECOVERY NOTE BY US POWER SQUADRON 2005 (FM)
 HV4233'RECOVERED IN GOOD CONDITION.
 HV4233
 HV4233                          STATION RECOVERY (2020)
 HV4233
 HV4233'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JKH)
 HV4233'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4148 ***********************************************************************
 HV4148  DESIGNATION -  CLOCK
 HV4148  PID         -  HV4148
 HV4148  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4148  COUNTRY     -  US
 HV4148  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4148
 HV4148                         *CURRENT SURVEY CONTROL
 HV4148  ______________________________________________________________________
 HV4148* NAD 83(1993) POSITION- 38 56 07.04819(N) 077 00 39.24407(W)   ADJUSTED
 HV4148  ______________________________________________________________________
 HV4148  GEOID HEIGHT    -        -32.038 (meters)                     GEOID18
 HV4148  LAPLACE CORR    -         -2.79  (seconds)                    DEFLEC18
 HV4148  HORZ ORDER      -  THIRD
 HV4148
 HV4148.The horizontal coordinates were established by classical geodetic methods
 HV4148.and adjusted by the National Geodetic Survey in November 1994.
 HV4148
 HV4148.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4148.GEOID18 height accuracy estimate available here.
 HV4148
 HV4148.Click photographs - Photos may exist for this station.
 HV4148
 HV4148.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4148
 HV4148. The following values were computed from the NAD 83(1993) position.
 HV4148
 HV4148;                    North         East     Units Scale Factor Converg.
 HV4148;SPC MD       -   140,822.973   399,054.862   MT  0.99995039   -0 00 24.6
 HV4148;SPC MD       -   462,016.70  1,309,232.49   sFT  0.99995039   -0 00 24.6
 HV4148;SPC VA N     - 2,141,864.901 3,629,102.348   MT  0.99996373   +0 55 45.7
 HV4148;SPC VA N     - 7,027,101.76 11,906,479.95   sFT  0.99996373   +0 55 45.7
 HV4148;UTM  18      - 4,311,518.393   325,706.452   MT  0.99997408   -1 15 50.6
 HV4148
 HV4148_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2570611518(NAD 83)
 HV4148
 HV4148                          SUPERSEDED SURVEY CONTROL
 HV4148
 HV4148  NAD 83(1991)-  38 56 07.04735(N)    077 00 39.24491(W) AD(       ) 3
 HV4148  NAD 83(1986)-  38 56 07.04671(N)    077 00 39.25539(W) AD(       ) 3
 HV4148  NAD 27      -  38 56 06.65400(N)    077 00 40.33800(W) AD(       ) 3
 HV4148
 HV4148.Superseded values are not recommended for survey control.
 HV4148
 HV4148.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4148.See file dsdata.pdf to determine how the superseded data were derived.
 HV4148
 HV4148_MARKER: 82 = FINIAL
 HV4148
 HV4148  HISTORY     - Date     Condition        Report By
 HV4148  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4148
 HV4148                          STATION DESCRIPTION
 HV4148
 HV4148'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4148'STATION IS THE CENTER OF THE FINIAL ON THE SPIRE, WITH 4-FACED
 HV4148'CLOCK, OF THE FORWARD BUILDING OF THE HOSPITAL GROUP ON THE
 HV4148'GROUNDS OF THE SOLDIERS HOME, NORTH OF THE CAPITOL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7706 ***********************************************************************
 HV7706  DESIGNATION -  COAL USE 1931
 HV7706  PID         -  HV7706
 HV7706  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7706  COUNTRY     -  US
 HV7706  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7706
 HV7706                         *CURRENT SURVEY CONTROL
 HV7706  ______________________________________________________________________
 HV7706* NAD 83(1993) POSITION- 38 54 02.00121(N) 076 57 32.60124(W)   ADJUSTED
 HV7706* NAVD 88 ORTHO HEIGHT -     5.6   (meters)       18.    (feet) VERTCON3
 HV7706  ______________________________________________________________________
 HV7706  GEOID HEIGHT    -        -32.207 (meters)                     GEOID18
 HV7706  LAPLACE CORR    -         -4.07  (seconds)                    DEFLEC18
 HV7706  HORZ ORDER      -  THIRD
 HV7706
 HV7706.The horizontal coordinates were established by classical geodetic methods
 HV7706.and adjusted by the National Geodetic Survey in November 1994.
 HV7706
 HV7706.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV7706.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV7706
 HV7706.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7706.GEOID18 height accuracy estimate available here.
 HV7706
 HV7706.Click photographs - Photos may exist for this station.
 HV7706
 HV7706.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7706
 HV7706. The following values were computed from the NAD 83(1993) position.
 HV7706
 HV7706;                    North         East     Units Scale Factor Converg.
 HV7706;SPC MD       -   136,967.806   403,551.622   MT  0.99994994   +0 01 32.5
 HV7706;SPC MD       -   449,368.54  1,323,985.61   sFT  0.99994994   +0 01 32.5
 HV7706;SPC VA N     - 2,138,083.671 3,633,661.547   MT  0.99996056   +0 57 42.2
 HV7706;SPC VA N     - 7,014,696.18 11,921,437.93   sFT  0.99996056   +0 57 42.2
 HV7706;UTM  18      - 4,307,565.473   330,117.643   MT  0.99995538   -1 13 49.9
 HV7706
 HV7706!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7706!SPC MD       -   1.00000418  x   0.99994994  =   0.99995412
 HV7706!SPC VA N     -   1.00000418  x   0.99996056  =   0.99996474
 HV7706!UTM  18      -   1.00000418  x   0.99995538  =   0.99995956
 HV7706
 HV7706:                Primary Azimuth Mark                     Grid Az
 HV7706:SPC MD       -  ROAD USE 1931                            233 36 25.5
 HV7706:SPC VA N     -  ROAD USE 1931                            232 40 15.8
 HV7706:UTM  18      -  ROAD USE 1931                            234 51 47.9
 HV7706
 HV7706_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3011707565(NAD 83)
 HV7706
 HV7706|---------------------------------------------------------------------|
 HV7706| PID    Reference Object                     Distance      Geod. Az  |
 HV7706|                                                           dddmmss.s |
 HV7706| HV7737 ROAD USE 1931                       APPROX. 0.6 KM 2333758.0 |
 HV7706|---------------------------------------------------------------------|
 HV7706
 HV7706                          SUPERSEDED SURVEY CONTROL
 HV7706
 HV7706  NAD 83(1991)-  38 54 01.99994(N)    076 57 32.60234(W) AD(       ) 3
 HV7706  NAD 83(1986)-  38 54 01.99908(N)    076 57 32.61342(W) AD(       ) 3
 HV7706  NAD 27      -  38 54 01.59300(N)    076 57 33.71200(W) AD(       ) 3
 HV7706  NGVD 29 (07/19/86)    5.8    (m)           19.     (f) VERT ANG       
 HV7706
 HV7706.Superseded values are not recommended for survey control.
 HV7706
 HV7706.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7706.See file dsdata.pdf to determine how the superseded data were derived.
 HV7706
 HV7706
 HV7706  HISTORY     - Date     Condition        Report By
 HV7706  HISTORY     - 1931     MONUMENTED       CGS
 HV7706  HISTORY     - 1958     MARK NOT FOUND   CGS
 HV7706
 HV7706                          STATION DESCRIPTION
 HV7706
 HV7706'DESCRIBED BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7706'DUE TO THE LACK OF A DESCRIPTION, THIS STATION IS NOT RECOVERABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV3990 ***********************************************************************
 HV3990  DESIGNATION -  COL
 HV3990  PID         -  HV3990
 HV3990  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV3990  COUNTRY     -  US
 HV3990  USGS QUAD   -  WASHINGTON WEST (2016)
 HV3990
 HV3990                         *CURRENT SURVEY CONTROL
 HV3990  ______________________________________________________________________
 HV3990* NAD 83(1993) POSITION- 38 54 26.20381(N) 077 04 21.77027(W)   ADJUSTED
 HV3990  ______________________________________________________________________
 HV3990  GEOID HEIGHT    -        -32.006 (meters)                     GEOID18
 HV3990  LAPLACE CORR    -         -2.81  (seconds)                    DEFLEC18
 HV3990  HORZ ORDER      -  THIRD
 HV3990
 HV3990.The horizontal coordinates were established by classical geodetic methods
 HV3990.and adjusted by the National Geodetic Survey in November 1994.
 HV3990
 HV3990.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV3990.GEOID18 height accuracy estimate available here.
 HV3990
 HV3990.Click photographs - Photos may exist for this station.
 HV3990
 HV3990.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV3990
 HV3990. The following values were computed from the NAD 83(1993) position.
 HV3990
 HV3990;                    North         East     Units Scale Factor Converg.
 HV3990;SPC MD       -   137,715.823   393,693.154   MT  0.99995000   -0 02 44.3
 HV3990;SPC MD       -   451,822.66  1,291,641.62   sFT  0.99995000   -0 02 44.3
 HV3990;SPC VA N     - 2,138,670.511 3,623,792.066   MT  0.99996114   +0 53 26.9
 HV3990;SPC VA N     - 7,016,621.50 11,889,057.80   sFT  0.99996114   +0 53 26.9
 HV3990;UTM  18      - 4,308,529.491   320,277.686   MT  0.99999775   -1 18 07.7
 HV3990
 HV3990_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2027708529(NAD 83)
 HV3990
 HV3990                          SUPERSEDED SURVEY CONTROL
 HV3990
 HV3990  NAD 83(1991)-  38 54 26.20260(N)    077 04 21.77187(W) AD(       ) 3
 HV3990  NAD 83(1986)-  38 54 26.20222(N)    077 04 21.78192(W) AD(       ) 3
 HV3990  NAD 27      -  38 54 25.80200(N)    077 04 22.85500(W) AD(       ) 3
 HV3990  USSD        -  38 54 26.13900(N)    077 04 22.68900(W) AD(       ) 3
 HV3990
 HV3990.Superseded values are not recommended for survey control.
 HV3990
 HV3990.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV3990.See file dsdata.pdf to determine how the superseded data were derived.
 HV3990
 HV3990
 HV3990  HISTORY     - Date     Condition        Report By
 HV3990  HISTORY     - 1880     FIRST OBSERVED   CGS
 HV3990  HISTORY     - 1924     GOOD             CGS
 HV3990  HISTORY     - 1940     GOOD             CGS
 HV3990  HISTORY     - 1946     GOOD             CGS
 HV3990  HISTORY     - 20061119 GOOD             GEOCAC
 HV3990
 HV3990                          STATION DESCRIPTION
 HV3990
 HV3990'DESCRIBED BY COAST AND GEODETIC SURVEY 1924 (EWE)
 HV3990'THIS STATION IS AS DESCRIBED IN THE OLD RECORDS EXCEPT THAT IT
 HV3990'IS DIFFICULT TO PICK OUT THE PROPER SPIRE FROM A DISTANCE.
 HV3990'IT SHOULD BE USED WITH GREAT CAUTION.  IT WAS CONSIDERED
 HV3990'NECESSARY BY ME TO GO TO AN OLD STATION TO CHECK ON THE IDENTITY
 HV3990'OF THE SPIRE BY TURNING OFF AN OLD ANGLE.
 HV3990
 HV3990                          STATION RECOVERY (1940)
 HV3990
 HV3990'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV3990'STATION RECOVERED.  THIS STATION WAS AS PREVIOUSLY DESCRIBED.
 HV3990'ITS POSITION IS THE SAME AS STATION GEORGETOWN COLLEGE, EAST
 HV3990'LIGHTNING ROD ON HIGHEST TOWER.  THIS INFORMATION IDENTIFIES
 HV3990'THE POINT USED.  THE LIGHTNING ROD AND TOWER REMAIN INTACT.
 HV3990
 HV3990                          STATION RECOVERY (1946)
 HV3990
 HV3990'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV3990'RECOVERED AS DESCRIBED.
 HV3990
 HV3990                          STATION RECOVERY (2006)
 HV3990
 HV3990'RECOVERY NOTE BY GEOCACHING 2006 (APC)
 HV3990'THIS STATION IS ON THE CENTER TOWER OF HEALY HALL, A
 HV3990'LANDMARK BUILDING ON THE CAMPUS OF GEORGETOWN UNIVERSITY. THE TOWER
 HV3990'RISES JUST ABOVE THE MAIN ENTRANCE OF THE BUILDING.
 HV3990'
 HV3990'THE TOWER IS TOPPED WITH TWO DECORATIVE METAL SPIRES. THE EAST
 HV3990'LIGHTNING ROD, AS DESCRIBED IN 1940, IS THE ONE TOWARD THE FRONT OF
 HV3990'THE BUILDING.
 HV3990'
 HV3990'THIS TOWER IS RECTANGULAR IN CROSS-SECTION. ANOTHER TOWER ON HEALY
 HV3990'HALL IS SQUARE IN CROSS-SECTION AND IS SHORTER AND IS LOCATED ABOUT
 HV3990'100 FEET TO THE SOUTH. THE OTHER TOWER IS GEORGETOWN UNIV LOWER SPIRE
 HV3990'(HV3961).
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7692 ***********************************************************************
 HV7692  DESIGNATION -  COLUMBIA DEAF AND DUMB INST FS
 HV7692  PID         -  HV7692
 HV7692  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7692  COUNTRY     -  US
 HV7692  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7692
 HV7692                         *CURRENT SURVEY CONTROL
 HV7692  ______________________________________________________________________
 HV7692* NAD 83(1993) POSITION- 38 54 20.74014(N) 076 59 42.24599(W)   ADJUSTED
 HV7692  ______________________________________________________________________
 HV7692  GEOID HEIGHT    -        -32.120 (meters)                     GEOID18
 HV7692  LAPLACE CORR    -         -3.77  (seconds)                    DEFLEC18
 HV7692  HORZ ORDER      -  THIRD
 HV7692
 HV7692.The horizontal coordinates were established by classical geodetic methods
 HV7692.and adjusted by the National Geodetic Survey in November 1994.
 HV7692
 HV7692.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7692.GEOID18 height accuracy estimate available here.
 HV7692
 HV7692.Click photographs - Photos may exist for this station.
 HV7692
 HV7692.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7692
 HV7692. The following values were computed from the NAD 83(1993) position.
 HV7692
 HV7692;                    North         East     Units Scale Factor Converg.
 HV7692;SPC MD       -   137,544.847   400,427.758   MT  0.99994998   +0 00 11.1
 HV7692;SPC MD       -   451,261.72  1,313,736.74   sFT  0.99994998   +0 00 11.1
 HV7692;SPC VA N     - 2,138,609.605 3,630,528.639   MT  0.99996101   +0 56 21.3
 HV7692;SPC VA N     - 7,016,421.68 11,911,159.38   sFT  0.99996101   +0 56 21.3
 HV7692;UTM  18      - 4,308,210.873   327,007.144   MT  0.99996852   -1 15 11.9
 HV7692
 HV7692_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2700708210(NAD 83)
 HV7692
 HV7692                          SUPERSEDED SURVEY CONTROL
 HV7692
 HV7692  NAD 83(1991)-  38 54 20.73909(N)    076 59 42.24694(W) AD(       ) 3
 HV7692  NAD 83(1986)-  38 54 20.73846(N)    076 59 42.25762(W) AD(       ) 3
 HV7692  NAD 27      -  38 54 20.33900(N)    076 59 43.34200(W) AD(       ) 3
 HV7692  USSD        -  38 54 20.67000(N)    076 59 43.18000(W) AD(       ) 3
 HV7692
 HV7692.Superseded values are not recommended for survey control.
 HV7692
 HV7692.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7692.See file dsdata.pdf to determine how the superseded data were derived.
 HV7692
 HV7692_MARKER: 83 = FLAGSTAFF
 HV7692_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV7692+SATELLITE: SATELLITE OBSERVATIONS - March 15, 2012
 HV7692
 HV7692  HISTORY     - Date     Condition        Report By
 HV7692  HISTORY     - 1880     FIRST OBSERVED   CGS
 HV7692  HISTORY     - 1913     GOOD             CGS
 HV7692  HISTORY     - 1939     GOOD             CGS
 HV7692  HISTORY     - 1958     GOOD             CGS
 HV7692  HISTORY     - 1971     GOOD             NGS
 HV7692  HISTORY     - 20030824 GOOD             GEOCAC
 HV7692  HISTORY     - 20120315 GOOD             GEOCAC
 HV7692
 HV7692                          STATION DESCRIPTION
 HV7692
 HV7692'DESCRIBED BY COAST AND GEODETIC SURVEY 1880 (CHS)
 HV7692'STATION IS FLAGSTAFF, ON BOUNDARY STREET AND 8TH (NEARLY NE).
 HV7692
 HV7692                          STATION RECOVERY (1913)
 HV7692
 HV7692'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV7692'STATION RECOVERED.  IT IS ON THE MAIN CUPOLA OF COLUMBIA DEAF
 HV7692'AND DUMB INSTITUTE ON FLORIDA AVENUE, NE.
 HV7692
 HV7692                          STATION RECOVERY (1939)
 HV7692
 HV7692'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV7692'THIS STATION WAS LOCATED IN 1880 AND WAS LISTED AS COLUMBIA DEAF
 HV7692'AND DUMB INSTITUTE, FLAGSTAFF, AND WAS DESCRIBED AS DEAF AND DUMB
 HV7692'ASYLUM, FLAGSTAFF, ON BOUNDARY STREET, AND 8TH, NE.
 HV7692'
 HV7692'THIS WAS EVIDENTLY THE SAME STATION (THE POSITION SEEMS TO
 HV7692'INDICATE IT ALSO) AS THAT LOCATED IN 1913, LISTED AS DEAF AND DUMB
 HV7692'INSTITUTE AND DESCRIBED AS MUTE.
 HV7692'
 HV7692'THE STATION IS THE FLAGSTAFF ON TOP OF THE TALLEST TOWER OF THE
 HV7692'MAIN BUILDING OF THE COLUMBIA INSTITUTION FOR THE DEAF, LOCATED
 HV7692'IN THE GROUNDS N OF THE INTERSECTION OF FLORIDA AVENUE, AND 8TH
 HV7692'STREET, NE.  THE TOWER, WHICH IS ABOUT 60 FEET HIGH AND
 HV7692'RECTANGULAR, IS ON THE W CORNER OF THE FRONT (SW) FACE AT THE
 HV7692'MAIN ENTRANCE TO THE BUILDING.
 HV7692'
 HV7692'A FLAGSTAFF IS STILL IN EXISTENCE AT THE PLACE DESCRIBED, AND ITS
 HV7692'POSITION WAS USED, AND FOUND TO CHECK, IN A 1/10,000 SCALE AIR
 HV7692'PHOTOGRAPHIC SURVEY IN WHICH THERE WAS A GREAT DEAL OF OTHER
 HV7692'TRIANGULATION CONTROL.
 HV7692
 HV7692                          STATION RECOVERY (1958)
 HV7692
 HV7692'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7692'THE STATION WAS RECOVERED IN GOOD CONDITION.  THE 1939 DESCRIPTION
 HV7692'BY T.M.P. JR. IS ADEQUATE AND COMPLETE.
 HV7692
 HV7692                          STATION RECOVERY (1971)
 HV7692
 HV7692'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7692'STATION WAS RECOVERED AS PREVIOUSLY DESCRIBED.
 HV7692'
 HV7692'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DISTRICT OF
 HV7692'COLUMBIA
 HV7692
 HV7692                          STATION RECOVERY (2003)
 HV7692
 HV7692'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV7692'INSTITUTION IS NOW KNOWN AS GALLAUDET UNIVERSITY.
 HV7692
 HV7692                          STATION RECOVERY (2012)
 HV7692
 HV7692'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV7692'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4243 ***********************************************************************
 HV4243  DESIGNATION -  COMMERCE
 HV4243  PID         -  HV4243
 HV4243  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4243  COUNTRY     -  US
 HV4243  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4243
 HV4243                         *CURRENT SURVEY CONTROL
 HV4243  ______________________________________________________________________
 HV4243* NAD 83(1993) POSITION- 38 53 32.95727(N) 077 01 58.05553(W)   ADJUSTED
 HV4243* NAVD 88 ORTHO HEIGHT -    38.    (meters)      125.    (feet) VERTCON3
 HV4243  ______________________________________________________________________
 HV4243  GEOID HEIGHT    -        -32.085 (meters)                     GEOID18
 HV4243  LAPLACE CORR    -         -2.52  (seconds)                    DEFLEC18
 HV4243  HORZ ORDER      -  FIRST
 HV4243
 HV4243.The horizontal coordinates were established by classical geodetic methods
 HV4243.and adjusted by the National Geodetic Survey in November 1994.
 HV4243
 HV4243.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4243.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4243
 HV4243.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4243.GEOID18 height accuracy estimate available here.
 HV4243
 HV4243.Click photographs - Photos may exist for this station.
 HV4243
 HV4243.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4243
 HV4243. The following values were computed from the NAD 83(1993) position.
 HV4243
 HV4243;                    North         East     Units Scale Factor Converg.
 HV4243;SPC MD       -   136,071.935   397,155.091   MT  0.99994989   -0 01 14.1
 HV4243;SPC MD       -   446,429.34  1,302,999.66   sFT  0.99994989   -0 01 14.1
 HV4243;SPC VA N     - 2,137,083.400 3,627,280.442   MT  0.99995987   +0 54 56.6
 HV4243;SPC VA N     - 7,011,414.45 11,900,502.58   sFT  0.99995987   +0 54 56.6
 HV4243;UTM  18      - 4,306,810.028   323,702.888   MT  0.99998273   -1 16 35.9
 HV4243
 HV4243!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4243!SPC MD       -   0.99999911  x   0.99994989  =   0.99994900
 HV4243!SPC VA N     -   0.99999911  x   0.99995987  =   0.99995898
 HV4243!UTM  18      -   0.99999911  x   0.99998273  =   0.99998184
 HV4243
 HV4243:                Primary Azimuth Mark                     Grid Az
 HV4243:SPC MD       -  CAPITOL STATUE OF FREEDOM HEAD           098 13 53.7
 HV4243:SPC VA N     -  CAPITOL STATUE OF FREEDOM HEAD           097 17 43.0
 HV4243:UTM  18      -  CAPITOL STATUE OF FREEDOM HEAD           099 29 15.5
 HV4243
 HV4243_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2370206810(NAD 83)
 HV4243
 HV4243|---------------------------------------------------------------------|
 HV4243| PID    Reference Object                     Distance      Geod. Az  |
 HV4243|                                                           dddmmss.s |
 HV4243| HV4150 CAPITOL STATUE OF FREEDOM HEAD      APPROX. 2.1 KM 0981239.6 |
 HV4243| HV4521 WMG 1981                            335.748 METERS 20517     |
 HV4243| HV4442 WASHINGTON MONUMENT                 396.854 METERS 21220     |
 HV4243|---------------------------------------------------------------------|
 HV4243
 HV4243                          SUPERSEDED SURVEY CONTROL
 HV4243
 HV4243  NAD 83(1991)-  38 53 32.95611(N)    077 01 58.05680(W) AD(       ) 1
 HV4243  NAD 83(1986)-  38 53 32.95567(N)    077 01 58.06747(W) AD(       ) 1
 HV4243  NAD 27      -  38 53 32.55600(N)    077 01 59.14700(W) AD(       ) 1
 HV4243  NGVD 29 (07/19/86)   38.     (m)          125.     (f) VERT ANG       
 HV4243
 HV4243.Superseded values are not recommended for survey control.
 HV4243
 HV4243.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4243.See file dsdata.pdf to determine how the superseded data were derived.
 HV4243
 HV4243_MARKER: DS = TRIANGULATION STATION DISK
 HV4243_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV4243_SP_SET: SHAFT
 HV4243_STAMPING: C. AND G.S. OFFICE
 HV4243_MARK LOGO: CGS
 HV4243_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV4243
 HV4243  HISTORY     - Date     Condition        Report By
 HV4243  HISTORY     - 1934     MONUMENTED       CGS
 HV4243  HISTORY     - 1960     GOOD             MADHOP
 HV4243
 HV4243                          STATION DESCRIPTION
 HV4243
 HV4243'DESCRIBED BY COAST AND GEODETIC SURVEY 1934
 HV4243'THE STATION CONSISTS OF A STANDARD MARK STAMPED C. AND G.S.
 HV4243'OFFICE, SET IN THE CENTER OF A CONCRETE SHAFT THAT IS BUILT
 HV4243'ON BEDROCK AND EXTENDS UP THROUGH THE COMMERCE BUILDING TO
 HV4243'THE TOP.  IT IS IN NO WAY CONNECTED WITH THE BUILDING.  THEREFORE
 HV4243'IS NOT EFFECTED BY MOVEMENTS OF THE LATTER.  THIS SHAFT IS
 HV4243'AT THE S END OF THE BUILDING, AND IS REACHED FROM THE 8TH
 HV4243'FLOOR THROUGH A TRAP-DOOR.  A TRAP-DOOR ALSO OPENS IN THE ROOF
 HV4243'JUST OVER THE MARK, SO THAT THE STATION MAY BE OCCUPIED BY
 HV4243'ERECTING A STAND ON THE ROOF.  THE TRAP-DOOR IS LOCATED ABOUT
 HV4243'THE CENTER OF THE S END OF THE BUILDING, AND IS THE CENTER
 HV4243'ONE OF THREE.
 HV4243'
 HV4243'NO REFERENCE MARKS OR AZIMUTH MARKS WERE ESTABLISHED.
 HV4243'
 HV4243'NOTE--THIS DESCRIPTION IS IN ERROR IN STATING THAT STATION IS
 HV4243'ON AN INDEPENDENT SHAFT EXTENDING UP THROUGH BUILDING.  IT IS
 HV4243'ON SHORT SHAFT FLOATED ON AN UPPER FLOOR.
 HV4243
 HV4243                          STATION RECOVERY (1960)
 HV4243
 HV4243'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4243'THIS STATION WAS RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4661 ***********************************************************************
 HV4661  DESIGNATION -  COMPASS USE 1939
 HV4661  PID         -  HV4661
 HV4661  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4661  COUNTRY     -  US
 HV4661  USGS QUAD   -  ALEXANDRIA (2019)
 HV4661
 HV4661                         *CURRENT SURVEY CONTROL
 HV4661  ______________________________________________________________________
 HV4661* NAD 83(1993) POSITION- 38 51 42.23762(N) 077 00 28.25271(W)   ADJUSTED
 HV4661* NAVD 88 ORTHO HEIGHT -     2.    (meters)        7.    (feet) SCALED
 HV4661  ______________________________________________________________________
 HV4661  GEOID HEIGHT    -        -32.181 (meters)                     GEOID18
 HV4661  LAPLACE CORR    -         -2.91  (seconds)                    DEFLEC18
 HV4661  HORZ ORDER      -  THIRD
 HV4661
 HV4661.The horizontal coordinates were established by classical geodetic methods
 HV4661.and adjusted by the National Geodetic Survey in November 1994.
 HV4661
 HV4661.The orthometric height was scaled from a topographic map.
 HV4661
 HV4661.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4661.GEOID18 height accuracy estimate available here.
 HV4661
 HV4661.Click photographs - Photos may exist for this station.
 HV4661
 HV4661.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4661
 HV4661. The following values were computed from the NAD 83(1993) position.
 HV4661
 HV4661;                    North         East     Units Scale Factor Converg.
 HV4661;SPC MD       -   132,657.365   399,318.871   MT  0.99994988   -0 00 17.7
 HV4661;SPC MD       -   435,226.71  1,310,098.66   sFT  0.99994988   -0 00 17.7
 HV4661;SPC VA N     - 2,133,704.612 3,629,499.746   MT  0.99995745   +0 55 52.6
 HV4661;SPC VA N     - 7,000,329.21 11,907,783.75   sFT  0.99995745   +0 55 52.6
 HV4661;UTM  18      - 4,303,348.764   325,791.384   MT  0.99997372   -1 15 36.5
 HV4661
 HV4661!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4661!SPC MD       -   1.00000477  x   0.99994988  =   0.99995465
 HV4661!SPC VA N     -   1.00000477  x   0.99995745  =   0.99996222
 HV4661!UTM  18      -   1.00000477  x   0.99997372  =   0.99997849
 HV4661
 HV4661:                Primary Azimuth Mark                     Grid Az
 HV4661:SPC MD       -  LAB USE 1939                             229 09 40.8
 HV4661:SPC VA N     -  LAB USE 1939                             228 13 30.5
 HV4661:UTM  18      -  LAB USE 1939                             230 24 59.6
 HV4661
 HV4661_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2579103348(NAD 83)
 HV4661
 HV4661|---------------------------------------------------------------------|
 HV4661| PID    Reference Object                     Distance      Geod. Az  |
 HV4661|                                                           dddmmss.s |
 HV4661| HV4668 LAB USE 1939                        APPROX. 0.8 KM 2290923.1 |
 HV4661| HV4663 BUZZ REFERENCE MARK USE 1939        438.357 METERS 3234127.8 |
 HV4661|---------------------------------------------------------------------|
 HV4661
 HV4661                          SUPERSEDED SURVEY CONTROL
 HV4661
 HV4661  NAD 83(1991)-  38 51 42.23618(N)    077 00 28.25399(W) AD(       ) 3
 HV4661  NAD 83(1986)-  38 51 42.23579(N)    077 00 28.26512(W) AD(       ) 3
 HV4661  NAD 27      -  38 51 41.83300(N)    077 00 29.34900(W) AD(       ) 3
 HV4661
 HV4661.Superseded values are not recommended for survey control.
 HV4661
 HV4661.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4661.See file dsdata.pdf to determine how the superseded data were derived.
 HV4661
 HV4661
 HV4661  HISTORY     - Date     Condition        Report By
 HV4661  HISTORY     - UNK      MONUMENTED       USACE
 HV4661  HISTORY     - 1939     GOOD             USACE
 HV4661
 HV4661                          STATION DESCRIPTION
 HV4661
 HV4661'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1939 (TMP)
 HV4661'TRIANGULATION STATION COMPASS, U.S.E., IS 79.21 FEET N 48 DEG
 HV4661'48 MIN 59 SEC W FROM AIRPLANE COMPASS, AND ON THE U.S.E. DESCRIPTION
 HV4661'AND SKETCH THIS STATION IS CALLED COMPASS REF.
 HV4661'
 HV4661'NOTE--ORIGINAL DESCRIPTION IS CONTAINED IN A LETTER DATED
 HV4661'OCTOBER 4, 1924, A COPY OF WHICH IS FILLED WITH THE 1924 FIELD
 HV4661'COMPUTATIONS 859-ETZ-81699.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1851 ***********************************************************************
 HV1851  DESIGNATION -  CON
 HV1851  PID         -  HV1851
 HV1851  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1851  COUNTRY     -  US
 HV1851  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1851
 HV1851                         *CURRENT SURVEY CONTROL
 HV1851  ______________________________________________________________________
 HV1851* NAD 83(1986) POSITION- 38 53 31.29   (N) 077 02 23.19   (W)   HD_HELD1
 HV1851* NAVD 88 ORTHO HEIGHT -     4.361 (meters)       14.31  (feet) ADJUSTED
 HV1851  ______________________________________________________________________
 HV1851  GEOID HEIGHT    -        -32.078 (meters)                     GEOID18
 HV1851  DYNAMIC HEIGHT  -          4.359 (meters)       14.30  (feet) COMP
 HV1851  MODELED GRAVITY -    980,097.2   (mgal)                       NAVD 88
 HV1851
 HV1851  VERT ORDER      -  FIRST     CLASS II
 HV1851
 HV1851.The horizontal coordinates were determined by differentially corrected
 HV1851.hand held GPS observations or other comparable positioning techniques
 HV1851.and have an estimated accuracy of +/- 3 meters.
 HV1851
 HV1851.The orthometric height was determined by differential leveling and
 HV1851.adjusted by the NATIONAL GEODETIC SURVEY
 HV1851.in October 2012.
 HV1851
 HV1851.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1851.GEOID18 height accuracy estimate available here.
 HV1851
 HV1851.Click photographs - Photos may exist for this station.
 HV1851
 HV1851.The dynamic height is computed by dividing the NAVD 88
 HV1851.geopotential number by the normal gravity value computed on the
 HV1851.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1851.degrees latitude (g = 980.6199 gals.).
 HV1851
 HV1851.The modeled gravity was interpolated from observed gravity values.
 HV1851
 HV1851
 HV1851_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2309606772(NAD 83)
 HV1851
 HV1851                          SUPERSEDED SURVEY CONTROL
 HV1851
 HV1851  NAVD 88 (06/15/91)    4.437  (m)           14.56   (f) SUPERSEDED  1 2
 HV1851  NGVD 29 (11/26/84)    4.673  (m)           15.33   (f) ADJUSTED    1 2
 HV1851
 HV1851.Superseded values are not recommended for survey control.
 HV1851
 HV1851.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1851.See file dsdata.pdf to determine how the superseded data were derived.
 HV1851
 HV1851_MARKER: Q = CHISELED SQUARE
 HV1851_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1851_SP_SET: DOORSILL
 HV1851_MARK LOGO: NONE
 HV1851_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1851_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1851+SATELLITE: SATELLITE OBSERVATIONS - March 30, 2022
 HV1851
 HV1851  HISTORY     - Date     Condition        Report By
 HV1851  HISTORY     - UNK      MONUMENTED       NONE
 HV1851  HISTORY     - 1941     GOOD             CGS
 HV1851  HISTORY     - 1956     GOOD             CGS
 HV1851  HISTORY     - 20031211 GOOD             GEOCAC
 HV1851  HISTORY     - 20070919 POOR             USACE
 HV1851  HISTORY     - 20100321 GOOD             GEOCAC
 HV1851  HISTORY     - 20110315 GOOD             GEOCAC
 HV1851  HISTORY     - 20120301 GOOD             NGS
 HV1851  HISTORY     - 20180718 GOOD             USPSQD
 HV1851  HISTORY     - 20220330 GOOD             NGS
 HV1851
 HV1851                          STATION DESCRIPTION
 HV1851
 HV1851'DESCRIBED BY COAST AND GEODETIC SURVEY 1941
 HV1851'AT WASHINGTON.
 HV1851'AT WASHINGTON, AT THE SOUTHWEST CORNER OF THE INTERSECTION OF
 HV1851'CONSTITUTION AVENUE AND SEVENTEENTH STREET NORTHWEST, AT THE
 HV1851'NORTH ENTRANCE TO THE PARK LODGE, AT THE OUTSIDE CORNER OF THE
 HV1851'EAST END OF THE STONE DOORSILL, AND NEAR THE PAINTED LETTERS BM
 HV1851'CON.  A CHISELED SQUARE.
 HV1851
 HV1851                          STATION RECOVERY (1956)
 HV1851
 HV1851'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956
 HV1851'RECOVERED IN GOOD CONDITION.
 HV1851
 HV1851                          STATION RECOVERY (2003)
 HV1851
 HV1851'RECOVERY NOTE BY GEOCACHING 2003
 HV1851'SMALL STONE BUILDING DESCRIBED IN 1941 AS PARK LODGE IS NOW KNOWN AS
 HV1851'CANAL LOCK KEEPER'S HOUSE. THE STEP ON WHICH THE SQUARE IS CHISELED
 HV1851'FACES CONSTITUTION AVENUE.
 HV1851
 HV1851                          STATION RECOVERY (2007)
 HV1851
 HV1851'RECOVERY NOTE BY US ARMY CORPS OF ENGINEERS 2007 (JBC)
 HV1851'PUBLISHED ELEVATION OF MARK IS SUSPECT.  3RD ORDER LEVELING FROM
 HV1851'HV1845, HV1848, AND AI4421 SHOWED MARK ELEVATION TO BE APPROXIMATELY
 HV1851'7CM BELOW THE PUBLISHED VALUE.
 HV1851
 HV1851                          STATION RECOVERY (2010)
 HV1851
 HV1851'RECOVERY NOTE BY GEOCACHING 2010 (MFM)
 HV1851'RECOVERED IN GOOD CONDITION.
 HV1851
 HV1851                          STATION RECOVERY (2011)
 HV1851
 HV1851'RECOVERY NOTE BY GEOCACHING 2011 (LPC)
 HV1851'RECOVERED IN GOOD CONDITION.
 HV1851
 HV1851                          STATION RECOVERY (2012)
 HV1851
 HV1851'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1851'RECOVERED AS DESCRIBED.
 HV1851
 HV1851                          STATION RECOVERY (2018)
 HV1851
 HV1851'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV1851'RECOVERED IN GOOD CONDITION.
 HV1851
 HV1851                          STATION RECOVERY (2022)
 HV1851
 HV1851'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2022 (GS)
 HV1851'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4225 ***********************************************************************
 HV4225  DESIGNATION -  CONCRETE CHIMNEY
 HV4225  PID         -  HV4225
 HV4225  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4225  COUNTRY     -  US
 HV4225  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4225
 HV4225                         *CURRENT SURVEY CONTROL
 HV4225  ______________________________________________________________________
 HV4225* NAD 83(1993) POSITION- 38 54 14.51353(N) 077 03 53.13234(W)   ADJUSTED
 HV4225  ______________________________________________________________________
 HV4225  GEOID HEIGHT    -        -32.024 (meters)                     GEOID18
 HV4225  LAPLACE CORR    -         -2.73  (seconds)                    DEFLEC18
 HV4225  HORZ ORDER      -  THIRD
 HV4225
 HV4225.The horizontal coordinates were established by classical geodetic methods
 HV4225.and adjusted by the National Geodetic Survey in November 1994.
 HV4225
 HV4225.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4225.GEOID18 height accuracy estimate available here.
 HV4225
 HV4225.Click photographs - Photos may exist for this station.
 HV4225
 HV4225.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4225
 HV4225. The following values were computed from the NAD 83(1993) position.
 HV4225
 HV4225;                    North         East     Units Scale Factor Converg.
 HV4225;SPC MD       -   137,354.827   394,382.873   MT  0.99994997   -0 02 26.3
 HV4225;SPC MD       -   450,638.29  1,293,904.48   sFT  0.99994997   -0 02 26.3
 HV4225;SPC VA N     - 2,138,320.831 3,624,487.601   MT  0.99996086   +0 53 44.7
 HV4225;SPC VA N     - 7,015,474.26 11,891,339.74   sFT  0.99996086   +0 53 44.7
 HV4225;UTM  18      - 4,308,153.440   320,959.356   MT  0.99999474   -1 17 49.4
 HV4225
 HV4225_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2095908153(NAD 83)
 HV4225
 HV4225                          SUPERSEDED SURVEY CONTROL
 HV4225
 HV4225  NAD 83(1991)-  38 54 14.51230(N)    077 03 53.13392(W) AD(       ) 3
 HV4225  NAD 83(1986)-  38 54 14.51198(N)    077 03 53.14422(W) AD(       ) 3
 HV4225  NAD 27      -  38 54 14.11300(N)    077 03 54.22000(W) AD(       ) 3
 HV4225  USSD        -  38 54 14.44900(N)    077 03 54.05200(W) AD(       ) 3
 HV4225
 HV4225.Superseded values are not recommended for survey control.
 HV4225
 HV4225.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4225.See file dsdata.pdf to determine how the superseded data were derived.
 HV4225
 HV4225_MARKER: 85 = CHIMNEY
 HV4225
 HV4225  HISTORY     - Date     Condition        Report By
 HV4225  HISTORY     - 1913     FIRST OBSERVED   CGS
 HV4225  HISTORY     - 1924     GOOD             CGS
 HV4225  HISTORY     - 1939     GOOD             CGS
 HV4225  HISTORY     - 1946     GOOD             CGS
 HV4225  HISTORY     - 1971     GOOD             NGS
 HV4225  HISTORY     - 19950617 GOOD             USPSQD
 HV4225
 HV4225                          STATION DESCRIPTION
 HV4225
 HV4225'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4225'STATION IS THE CENTER OF THE ONLY LARGE TALL CHIMNEY IN THE
 HV4225'SOUTHERN PART OF GEORGETOWN HAVING AN APPEARANCE OF BEING BUILT
 HV4225'OF CONCRETE.  IT IS LOCATED ON THE BANK OF THE CANAL LESS THAN
 HV4225'1/4 MILE NW OF THE LARGE POWER PLANT OF THE CAPITAL TRACTION
 HV4225'COMPANY WHICH IS LOCATED ON THE RIVER BANK AT THE FOOT OF
 HV4225'WISCONSIN AVENUE.
 HV4225
 HV4225                          STATION RECOVERY (1924)
 HV4225
 HV4225'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1924 (EWE)
 HV4225'STATION RECOVERED AS DESCRIBED.
 HV4225
 HV4225                          STATION RECOVERY (1939)
 HV4225
 HV4225'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4225'THIS IS THE CONCRETE STACK OF THE DISTRICT OF COLUMBIA PAPER
 HV4225'MANUFACTURING COMPANY, LOCATED NEAR THE NE CORNER OF GRACE AND
 HV4225'POTOMAC STREETS.  STATION RECOVERED INTACT.
 HV4225
 HV4225                          STATION RECOVERY (1946)
 HV4225
 HV4225'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4225'RECOVERED AS DESCRIBED.
 HV4225
 HV4225                          STATION RECOVERY (1971)
 HV4225
 HV4225'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4225'STATION RECOVERED AND APPEARS TO BE IN GOOD CONDITION.  THE
 HV4225'1939 DESCRIPTION IS ADEQUATE.
 HV4225'
 HV4225'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DIST. OF COL.
 HV4225
 HV4225                          STATION RECOVERY (1995)
 HV4225
 HV4225'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4225'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4015 ***********************************************************************
 HV4015  DESIGNATION -  COURSE
 HV4015  PID         -  HV4015
 HV4015  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4015  COUNTRY     -  US
 HV4015  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4015
 HV4015                         *CURRENT SURVEY CONTROL
 HV4015  ______________________________________________________________________
 HV4015* NAD 83(1993) POSITION- 38 53 25.79357(N) 077 03 13.32066(W)   ADJUSTED
 HV4015* NAVD 88 ORTHO HEIGHT -     2.    (meters)        7.    (feet) SCALED
 HV4015  ______________________________________________________________________
 HV4015  GEOID HEIGHT    -        -32.063 (meters)                     GEOID18
 HV4015  LAPLACE CORR    -         -2.55  (seconds)                    DEFLEC18
 HV4015  HORZ ORDER      -  THIRD
 HV4015
 HV4015.The horizontal coordinates were established by classical geodetic methods
 HV4015.and adjusted by the National Geodetic Survey in November 1994.
 HV4015
 HV4015.The orthometric height was scaled from a topographic map.
 HV4015
 HV4015.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4015.GEOID18 height accuracy estimate available here.
 HV4015
 HV4015.Click photographs - Photos may exist for this station.
 HV4015
 HV4015.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4015
 HV4015. The following values were computed from the NAD 83(1993) position.
 HV4015
 HV4015;                    North         East     Units Scale Factor Converg.
 HV4015;SPC MD       -   135,851.898   395,341.218   MT  0.99994988   -0 02 01.3
 HV4015;SPC MD       -   445,707.44  1,297,048.65   sFT  0.99994988   -0 02 01.3
 HV4015;SPC VA N     - 2,136,833.749 3,625,470.389   MT  0.99995971   +0 54 09.6
 HV4015;SPC VA N     - 7,010,595.39 11,894,564.10   sFT  0.99995971   +0 54 09.6
 HV4015;UTM  18      - 4,306,629.798   321,884.561   MT  0.99999067   -1 17 23.0
 HV4015
 HV4015!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4015!SPC MD       -   1.00000475  x   0.99994988  =   0.99995463
 HV4015!SPC VA N     -   1.00000475  x   0.99995971  =   0.99996446
 HV4015!UTM  18      -   1.00000475  x   0.99999067  =   0.99999542
 HV4015
 HV4015:                Primary Azimuth Mark                     Grid Az
 HV4015:SPC MD       -  FINISH                                   235 14 56.2
 HV4015:SPC VA N     -  FINISH                                   234 18 45.3
 HV4015:UTM  18      -  FINISH                                   236 30 17.9
 HV4015
 HV4015_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2188406629(NAD 83)
 HV4015
 HV4015|---------------------------------------------------------------------|
 HV4015| PID    Reference Object                     Distance      Geod. Az  |
 HV4015|                                                           dddmmss.s |
 HV4015| HV4301 HEURICHS BREWERY FINIAL             435.300 METERS 0004839.7 |
 HV4015| HV4284 DRIVE 1935                          155.180 METERS 11912     |
 HV4015| HV4313 FINISH                              APPROX. 0.6 KM 2351254.9 |
 HV4015|---------------------------------------------------------------------|
 HV4015
 HV4015                          SUPERSEDED SURVEY CONTROL
 HV4015
 HV4015  NAD 83(1991)-  38 53 25.79228(N)    077 03 13.32217(W) AD(       ) 3
 HV4015  NAD 83(1986)-  38 53 25.79221(N)    077 03 13.33221(W) AD(       ) 3
 HV4015  NAD 27      -  38 53 25.39100(N)    077 03 14.40800(W) AD(       ) 3
 HV4015
 HV4015.Superseded values are not recommended for survey control.
 HV4015
 HV4015.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4015.See file dsdata.pdf to determine how the superseded data were derived.
 HV4015
 HV4015_MARKER: DE = TRAVERSE STATION DISK
 HV4015_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV4015_SP_SET: SIDEWALK
 HV4015_STAMPING: COURSE 1935
 HV4015_MARK LOGO: CGS
 HV4015_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4015
 HV4015  HISTORY     - Date     Condition        Report By
 HV4015  HISTORY     - 1935     MONUMENTED       CGS
 HV4015  HISTORY     - 1939     GOOD             CGS
 HV4015  HISTORY     - 1946     GOOD             CGS
 HV4015  HISTORY     - 1959     GOOD             CGS
 HV4015
 HV4015                          STATION DESCRIPTION
 HV4015
 HV4015'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (LOC)
 HV4015'THIS TRAVERSE STATION IS A STANDARD BRONZE DISK STAMPED COURSE
 HV4015'1935 SET FLUSH IN THE CONCRETE SIDEWALK ON THE RIVER SIDE (SW)
 HV4015'OF POTOMAC RIVER DRIVE 505.5 FEET NW OF THE EASTERN SIDE OF THE
 HV4015'PYLON ON THE RIVER SIDE OF THE ENTRANCE TO POTOMAC RIVER DRIVE,
 HV4015'WHICH IS NW OF THE LINCOLN MEMORIAL.  MARK IS 9.83 FEET SW OF
 HV4015'THE STREET EDGE OF THE GRANITE CURB, 2.0 FEET NE OF THE NE EDGE
 HV4015'OF THE GRANITE BASE OF THE GRANITE BALUSTRADE, AND 32.8 FEET
 HV4015'NW OF THE NW END OF THE THIRD GRANITE SEAT ALONG THE
 HV4015'BALUSTRADE FROM THE PYLON AT THE ENTRANCE TO POTOMAC RIVER
 HV4015'DRIVE.  IT IS THE FINISH OF THE 1 MILE SPEEDBOAT RACE COURSE
 HV4015'WITH THE START AT GATE.
 HV4015
 HV4015                          STATION RECOVERY (1939)
 HV4015
 HV4015'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4015'DESCRIBED AND MARKED AS A TRAVERSE STATION.  RECOVERED IN GOOD
 HV4015'CONDITION.  THE DESCRIPTION IS ADEQUATE.
 HV4015
 HV4015                          STATION RECOVERY (1946)
 HV4015
 HV4015'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4015'RECOVERED AS DESCRIBED.  MARK IN GOOD CONDITION.  DESCRIPTION
 HV4015'ADEQUATE.
 HV4015
 HV4015                          STATION RECOVERY (1959)
 HV4015
 HV4015'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (BFL)
 HV4015'STATION RECOVERED AS DESCRIBED. IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4679 ***********************************************************************
 HV4679  DESIGNATION -  COURSE
 HV4679  PID         -  HV4679
 HV4679  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4679  COUNTRY     -  US
 HV4679  USGS QUAD   -  ALEXANDRIA (2019)
 HV4679
 HV4679                         *CURRENT SURVEY CONTROL
 HV4679  ______________________________________________________________________
 HV4679* NAD 83(1993) POSITION- 38 48 50.85509(N) 077 01 52.50822(W)   ADJUSTED
 HV4679* NAVD 88 ORTHO HEIGHT -    -0.    (meters)       -0.    (feet) SCALED
 HV4679  ______________________________________________________________________
 HV4679  GEOID HEIGHT    -        -32.224 (meters)                     GEOID18
 HV4679  LAPLACE CORR    -         -3.03  (seconds)                    DEFLEC18
 HV4679  HORZ ORDER      -  SECOND
 HV4679
 HV4679.The horizontal coordinates were established by classical geodetic methods
 HV4679.and adjusted by the National Geodetic Survey in November 1994.
 HV4679
 HV4679.The orthometric height was scaled from a topographic map.
 HV4679
 HV4679.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4679.GEOID18 height accuracy estimate available here.
 HV4679
 HV4679.Click photographs - Photos may exist for this station.
 HV4679
 HV4679.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4679
 HV4679. The following values were computed from the NAD 83(1993) position.
 HV4679
 HV4679;                    North         East     Units Scale Factor Converg.
 HV4679;SPC MD       -   127,373.179   397,285.793   MT  0.99995042   -0 01 10.6
 HV4679;SPC MD       -   417,890.17  1,303,428.47   sFT  0.99995042   -0 01 10.6
 HV4679;SPC VA N     - 2,128,387.882 3,627,553.271   MT  0.99995426   +0 55 00.0
 HV4679;SPC VA N     - 6,982,885.91 11,901,397.69   sFT  0.99995426   +0 55 00.0
 HV4679;UTM  18      - 4,298,110.210   323,643.039   MT  0.99998300   -1 16 24.6
 HV4679
 HV4679!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4679!SPC MD       -   1.00000510  x   0.99995042  =   0.99995552
 HV4679!SPC VA N     -   1.00000510  x   0.99995426  =   0.99995936
 HV4679!UTM  18      -   1.00000510  x   0.99998300  =   0.99998810
 HV4679
 HV4679_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2364398110(NAD 83)
 HV4679
 HV4679                          SUPERSEDED SURVEY CONTROL
 HV4679
 HV4679  NAD 83(1991)-  38 48 50.85340(N)    077 01 52.50963(W) AD(       ) 2
 HV4679  NAD 83(1986)-  38 48 50.85341(N)    077 01 52.52116(W) AD(       ) 2
 HV4679  NAD 27      -  38 48 50.44700(N)    077 01 53.60200(W) AD(       ) 2
 HV4679  USSD        -  38 48 50.79100(N)    077 01 53.42900(W) AD(       ) 3
 HV4679
 HV4679.Superseded values are not recommended for survey control.
 HV4679
 HV4679.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4679.See file dsdata.pdf to determine how the superseded data were derived.
 HV4679
 HV4679_MARKER: Z = SEE DESCRIPTION
 HV4679_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4679
 HV4679  HISTORY     - Date     Condition        Report By
 HV4679  HISTORY     - 1922     MONUMENTED       CGS
 HV4679  HISTORY     - 1928     GOOD             CGS
 HV4679
 HV4679                          STATION DESCRIPTION
 HV4679
 HV4679'DESCRIBED BY COAST AND GEODETIC SURVEY 1922 (HPO)
 HV4679'STATION IS THE CENTER OF THE 4- BY 4-INCH MAST OF THE WESTERLY
 HV4679'TARGET MARKING THE S RANGE OF THE SPEED TRIAL COURSE.  THE TARGET
 HV4679'IS SECURELY NAILED TO ONE OF THE PILES OF THE WHARF AT SHEPHERDS
 HV4679'LANDING.  THE WHARF IS AT PRESENT IN RUINS, THE ENTIRE FLOOR
 HV4679'BEING GONE.  THE FEW REMAINING PILES, ALL OF WHICH ARE UNSOUND,
 HV4679'WILL PROBABLY BE COMPLETELY DESTROYED WITHIN THE NEXT FEW YEARS.
 HV4679'STATION IS ABOUT 200 METERS FROM SHORE.
 HV4679'
 HV4679'NO REFERENCE MARK WAS ESTABLISHED.
 HV4679
 HV4679                          STATION RECOVERY (1928)
 HV4679
 HV4679'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1928 (CP)
 HV4679'STATION RECOVERED AS DESCRIBED.  BOTH THE TARGET 4- BY 4-INCH POLE
 HV4679'AND THE PILING TO WHICH IT IS SECURED ARE ROTTEN.  THE TARGET POLE
 HV4679'IS OUT OF PLUMB OVER AN INCH AND THE WHOLE STRUCTURE IS LIABLE
 HV4679'TO FALL TO PIECES IN ANY STRONG WIND.  THE PRESENT POINT MAY BE
 HV4679'OF USE AS LONG AS IT REMAINS IN ITS PRESENT POSITION FOR
 HV4679'HYDROGRAPHIC PURPOSES BUT IT IS TOO NON-PERMANENT FOR
 HV4679'TRIANGULATION PURPOSES.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4678 ***********************************************************************
 HV4678  DESIGNATION -  COURSE 2
 HV4678  PID         -  HV4678
 HV4678  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4678  COUNTRY     -  US
 HV4678  USGS QUAD   -  ALEXANDRIA (2019)
 HV4678
 HV4678                         *CURRENT SURVEY CONTROL
 HV4678  ______________________________________________________________________
 HV4678* NAD 83(1993) POSITION- 38 48 50.85423(N) 077 01 52.51363(W)   ADJUSTED
 HV4678* NAVD 88 ORTHO HEIGHT -    -0.    (meters)       -0.    (feet) SCALED
 HV4678  ______________________________________________________________________
 HV4678  GEOID HEIGHT    -        -32.224 (meters)                     GEOID18
 HV4678  LAPLACE CORR    -         -3.03  (seconds)                    DEFLEC18
 HV4678  HORZ ORDER      -  THIRD
 HV4678
 HV4678.The horizontal coordinates were established by classical geodetic methods
 HV4678.and adjusted by the National Geodetic Survey in November 1994.
 HV4678
 HV4678.The orthometric height was scaled from a topographic map.
 HV4678
 HV4678.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4678.GEOID18 height accuracy estimate available here.
 HV4678
 HV4678.Click photographs - Photos may exist for this station.
 HV4678
 HV4678.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4678
 HV4678. The following values were computed from the NAD 83(1993) position.
 HV4678
 HV4678;                    North         East     Units Scale Factor Converg.
 HV4678;SPC MD       -   127,373.153   397,285.662   MT  0.99995042   -0 01 10.6
 HV4678;SPC MD       -   417,890.09  1,303,428.04   sFT  0.99995042   -0 01 10.6
 HV4678;SPC VA N     - 2,128,387.853 3,627,553.141   MT  0.99995426   +0 55 00.0
 HV4678;SPC VA N     - 6,982,885.81 11,901,397.26   sFT  0.99995426   +0 55 00.0
 HV4678;UTM  18      - 4,298,110.187   323,642.908   MT  0.99998300   -1 16 24.6
 HV4678
 HV4678!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4678!SPC MD       -   1.00000510  x   0.99995042  =   0.99995552
 HV4678!SPC VA N     -   1.00000510  x   0.99995426  =   0.99995936
 HV4678!UTM  18      -   1.00000510  x   0.99998300  =   0.99998810
 HV4678
 HV4678_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2364298110(NAD 83)
 HV4678
 HV4678                          SUPERSEDED SURVEY CONTROL
 HV4678
 HV4678  NAD 83(1991)-  38 48 50.85254(N)    077 01 52.51505(W) AD(       ) 3
 HV4678  NAD 83(1986)-  38 48 50.85254(N)    077 01 52.52669(W) AD(       ) 3
 HV4678  NAD 27      -  38 48 50.44400(N)    077 01 53.60700(W) AD(       ) 3
 HV4678
 HV4678.Superseded values are not recommended for survey control.
 HV4678
 HV4678.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4678.See file dsdata.pdf to determine how the superseded data were derived.
 HV4678
 HV4678_MARKER: Z = SEE DESCRIPTION
 HV4678_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4678
 HV4678  HISTORY     - Date     Condition        Report By
 HV4678  HISTORY     - 1928     MONUMENTED       CGS
 HV4678
 HV4678                          STATION DESCRIPTION
 HV4678
 HV4678'DESCRIBED BY COAST AND GEODETIC SURVEY 1928 (CP)
 HV4678'STATION IS THE CENTER OF A 4- BY 4-INCH MAST OF THE WESTERLY
 HV4678'TARGET MARKING THE S RANGE OF THE SPEED TRIAL COURSE.  THE
 HV4678'TARGET IS NAILED TO ONE OF THE PILES TO THE WHARF AT SHEPHERDS
 HV4678'LANDING, THE WHARF AT PRESENT IS IN RUINS.  STATION IS ABOUT
 HV4678'200 METERS FROM SHORE.  THE ABOVE DESCRIPTION IS FOR COURSE
 HV4678'ESTABLISHED BY H.P. ODESSEY IN 1922.  THE SAME TARGET WAS
 HV4678'USED FOR COURSE 2, BUT DUE TO THE FACT THAT BOTH THE TARGET
 HV4678'4- BY 4-INCH AND THE PILING IT WAS NAILED TO WERE ROTTEN
 HV4678'AS PUNK AND THE MAST OF THE TARGET OUT OF LEVEL, THE MAST OF
 HV4678'THE TARGET WAS DRESSED WITH SIGNAL CLOTH AND THIS POINT
 HV4678'CALLED COURSE 2.  IT IS ONLY A MATTER OF TIME WHEN THE TARGET
 HV4678'POLE, AND PILE WILL FALL TO PIECES AND THIS STATION
 HV4678'IS NOT AT ALL A PERMANENT MARK.
 HV4678'
 HV4678'THERE ARE NO REFERENCE MARKS AND THE STATION WAS NOT OCCUPIED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4197 ***********************************************************************
 HV4197  DESIGNATION -  CRAMPTON
 HV4197  PID         -  HV4197
 HV4197  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4197  COUNTRY     -  US
 HV4197  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4197
 HV4197                         *CURRENT SURVEY CONTROL
 HV4197  ______________________________________________________________________
 HV4197* NAD 83(1993) POSITION- 38 54 17.45499(N) 077 04 35.84742(W)   ADJUSTED
 HV4197* NAVD 88 ORTHO HEIGHT -     3.    (meters)       10.    (feet) SCALED
 HV4197  ______________________________________________________________________
 HV4197  GEOID HEIGHT    -        -32.005 (meters)                     GEOID18
 HV4197  LAPLACE CORR    -         -2.83  (seconds)                    DEFLEC18
 HV4197  HORZ ORDER      -  THIRD
 HV4197
 HV4197.The horizontal coordinates were established by classical geodetic methods
 HV4197.and adjusted by the National Geodetic Survey in November 1994.
 HV4197
 HV4197.The orthometric height was scaled from a topographic map.
 HV4197
 HV4197.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4197.GEOID18 height accuracy estimate available here.
 HV4197
 HV4197.Click photographs - Photos may exist for this station.
 HV4197
 HV4197.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4197
 HV4197. The following values were computed from the NAD 83(1993) position.
 HV4197
 HV4197;                    North         East     Units Scale Factor Converg.
 HV4197;SPC MD       -   137,446.325   393,353.766   MT  0.99994998   -0 02 53.1
 HV4197;SPC MD       -   450,938.48  1,290,528.15   sFT  0.99994998   -0 02 53.1
 HV4197;SPC VA N     - 2,138,395.499 3,623,457.124   MT  0.99996093   +0 53 18.1
 HV4197;SPC VA N     - 7,015,719.23 11,887,958.91   sFT  0.99996093   +0 53 18.1
 HV4197;UTM  18      - 4,308,267.487   319,932.454   MT  0.99999928   -1 18 16.3
 HV4197
 HV4197!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4197!SPC MD       -   1.00000459  x   0.99994998  =   0.99995457
 HV4197!SPC VA N     -   1.00000459  x   0.99996093  =   0.99996552
 HV4197!UTM  18      -   1.00000459  x   0.99999928  =   1.00000387
 HV4197
 HV4197:                Primary Azimuth Mark                     Grid Az
 HV4197:SPC MD       -  WASHINGTON BASE NO 1 USE 1956            099 04 02.1
 HV4197:SPC VA N     -  WASHINGTON BASE NO 1 USE 1956            098 07 50.9
 HV4197:UTM  18      -  WASHINGTON BASE NO 1 USE 1956            100 19 25.3
 HV4197
 HV4197_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1993208267(NAD 83)
 HV4197
 HV4197|---------------------------------------------------------------------|
 HV4197| PID    Reference Object                     Distance      Geod. Az  |
 HV4197|                                                           dddmmss.s |
 HV4197| HV4451 WASHINGTON BASE NO 1 USE 1956       APPROX. 0.6 KM 0990109.0 |
 HV4197| HV3620 MAPLE POINT 147                     311.870 METERS 20630     |
 HV4197|---------------------------------------------------------------------|
 HV4197
 HV4197                          SUPERSEDED SURVEY CONTROL
 HV4197
 HV4197  NAD 83(1991)-  38 54 17.45376(N)    077 04 35.84899(W) AD(       ) 3
 HV4197  NAD 83(1986)-  38 54 17.45329(N)    077 04 35.85866(W) AD(       ) 3
 HV4197  NAD 27      -  38 54 17.05400(N)    077 04 36.93100(W) AD(       ) 3
 HV4197
 HV4197.Superseded values are not recommended for survey control.
 HV4197
 HV4197.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4197.See file dsdata.pdf to determine how the superseded data were derived.
 HV4197
 HV4197_MARKER: DD = SURVEY DISK
 HV4197_SETTING: 2 = IMBEDDED OR DRIVEN IN THE GROUND
 HV4197_SP_SET: IRON PIPE FILLED WITH CONCRETE
 HV4197_STAMPING: 897
 HV4197_MARK LOGO: USACE
 HV4197_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4197
 HV4197  HISTORY     - Date     Condition        Report By
 HV4197  HISTORY     - 1932     MONUMENTED       CGS
 HV4197  HISTORY     - 1946     GOOD             CGS
 HV4197  HISTORY     - 1947     GOOD             CGS
 HV4197
 HV4197                          STATION DESCRIPTION
 HV4197
 HV4197'DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4197'STATION SITE IS ON E SHORE OF POTOMAC RIVER ABOVE KEY BRIDGE
 HV4197'IN A SECTION OF DISTRICT OF COLUMBIA KNOWN AS GEORGETOWN,
 HV4197'BETWEEN THE C. AND O. CANAL AND THE RIVER.  STATION IS APPROACHED
 HV4197'AFTER CROSSING THE KEY BRIDGE BY TURNING LEFT AT THE END OF
 HV4197'THE BRIDGE, PROCEEDING UP CANAL ROAD TO MAC ARTHUR BOULEVARD,
 HV4197'TURNING RIGHT OFF CANAL ROAD AT THE JUNCTION INTO A GRAVEL
 HV4197'DRIVEWAY LEADING DOWN AND TO THE LEFT AROUND A SHARP CURVE,
 HV4197'THEN INTO A TUNNEL UNDER THE CANAL AND CANAL ROAD, OUT OF THE
 HV4197'TUNNEL, ACROSS THE B. AND O. RAILWAY TRACK, TURNING SHARP
 HV4197'LEFT AND FOLLOWING ALONG THE TRACK PAST A MARINE RAILWAY ON
 HV4197'THE RIGHT AND THEN A BOAT STORAGE HOUSE TO A LARGE FRAME
 HV4197'RESIDENCE WHICH IS ON THE PROPERTY WHERE THE STATION IS
 HV4197'LOCATED.
 HV4197'
 HV4197'STATION IS A U.S.E. CONCRETE MONUMENT ENCASED IN PIPE 0.3
 HV4197'FOOT ABOVE SURFACE IN CRAMPTONS YARD ON A ROCK PILE BELOW
 HV4197'THE BOATHOUSE.  REFERENCE 1--1/2-INCH PIPE 0.4 FOOT ABOVE
 HV4197'SURFACE ON TOP OF KNOLL AT UPPER SIDE OF ALLEY.  REFERENCE
 HV4197'2--NAIL IN BLAZE OF 24-INCH MAPLE 3.0 FEET ABOVE SURFACE,
 HV4197'FORKED 6.0 FEET ABOVE SURFACE.  REFERENCE 3.  LOWER AND
 HV4197'OUTER CORNER STONE BULKHEAD CRAMPTONS BOATHOUSE.  REFERENCE
 HV4197'4--CONCRETE CORNER OF CRAMPTONS HOUSE.  REFERENCE 5--CORNER OF
 HV4197'HOUSE.
 HV4197
 HV4197                          STATION RECOVERY (1947)
 HV4197
 HV4197'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947 (RMB)
 HV4197'STATION IS LOCATED ON THE DISTRICT OF COLUMBIA BANK OF THE
 HV4197'POTOMAC RIVER, ABOUT A HALF MILE ABOVE KEY BRIDGE, 30.5
 HV4197'FEET NW OF THE NW CORNER OF THE HOUSE T 3912 K STREET, NW,
 HV4197'AND 22.5 FEET FROM THE BANK OF THE RIVER.  STATION IS MARKED
 HV4197'BY A 6-INCH CAST-IRON PIPE FILLED WITH CONCRETE FROM WHICH
 HV4197'THE DISK HAS APPARENTLY BEEN REMOVED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4326 ***********************************************************************
 HV4326  DESIGNATION -  CRANFORD
 HV4326  PID         -  HV4326
 HV4326  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4326  COUNTRY     -  US
 HV4326  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4326
 HV4326                         *CURRENT SURVEY CONTROL
 HV4326  ______________________________________________________________________
 HV4326* NAD 83(1993) POSITION- 38 53 45.06451(N) 077 03 23.56923(W)   ADJUSTED
 HV4326* NAVD 88 ORTHO HEIGHT -     3.    (meters)       10.    (feet) SCALED
 HV4326  ______________________________________________________________________
 HV4326  GEOID HEIGHT    -        -32.050 (meters)                     GEOID18
 HV4326  LAPLACE CORR    -         -2.50  (seconds)                    DEFLEC18
 HV4326  HORZ ORDER      -  THIRD
 HV4326
 HV4326.The horizontal coordinates were established by classical geodetic methods
 HV4326.and adjusted by the National Geodetic Survey in November 1994.
 HV4326
 HV4326.The orthometric height was scaled from a topographic map.
 HV4326
 HV4326.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4326.GEOID18 height accuracy estimate available here.
 HV4326
 HV4326.Click photographs - Photos may exist for this station.
 HV4326
 HV4326.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4326
 HV4326. The following values were computed from the NAD 83(1993) position.
 HV4326
 HV4326;                    North         East     Units Scale Factor Converg.
 HV4326;SPC MD       -   136,446.277   395,094.609   MT  0.99994991   -0 02 07.8
 HV4326;SPC MD       -   447,657.49  1,296,239.56   sFT  0.99994991   -0 02 07.8
 HV4326;SPC VA N     - 2,137,424.024 3,625,214.097   MT  0.99996016   +0 54 03.2
 HV4326;SPC VA N     - 7,012,531.99 11,893,723.25   sFT  0.99996016   +0 54 03.2
 HV4326;UTM  18      - 4,307,229.464   321,651.031   MT  0.99999169   -1 17 30.0
 HV4326
 HV4326!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4326!SPC MD       -   1.00000460  x   0.99994991  =   0.99995450
 HV4326!SPC VA N     -   1.00000460  x   0.99996016  =   0.99996475
 HV4326!UTM  18      -   1.00000460  x   0.99999169  =   0.99999629
 HV4326
 HV4326:                Primary Azimuth Mark                     Grid Az
 HV4326:SPC MD       -  SCOW USE 1932                            310 42 32.7
 HV4326:SPC VA N     -  SCOW USE 1932                            309 46 21.7
 HV4326:UTM  18      -  SCOW USE 1932                            311 57 54.9
 HV4326
 HV4326_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2165107229(NAD 83)
 HV4326
 HV4326|---------------------------------------------------------------------|
 HV4326| PID    Reference Object                     Distance      Geod. Az  |
 HV4326|                                                           dddmmss.s |
 HV4326| HV4331 PARK USE 1932                       312.309 METERS 16723     |
 HV4326| HV4300 F USE 1932                          427.253 METERS 2221726.5 |
 HV4326| HV4299 BASE                                292.793 METERS 27242     |
 HV4326| HV4400 SCOW USE 1932                       457.804 METERS 3104024.9 |
 HV4326| HV4403 WALL USE 1932                       289.381 METERS 35855     |
 HV4326|---------------------------------------------------------------------|
 HV4326
 HV4326                          SUPERSEDED SURVEY CONTROL
 HV4326
 HV4326  NAD 83(1991)-  38 53 45.06326(N)    077 03 23.57077(W) AD(       ) 3
 HV4326  NAD 83(1986)-  38 53 45.06296(N)    077 03 23.58129(W) AD(       ) 3
 HV4326  NAD 27      -  38 53 44.65950(N)    077 03 24.65720(W) AD(       ) 3
 HV4326
 HV4326.Superseded values are not recommended for survey control.
 HV4326
 HV4326.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4326.See file dsdata.pdf to determine how the superseded data were derived.
 HV4326
 HV4326_MARKER: DD = SURVEY DISK
 HV4326_SETTING: 17 = SET INTO TOP OF METAL PIPE DRIVEN INTO GROUND
 HV4326_STAMPING: 897
 HV4326_MARK LOGO: USACE
 HV4326_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4326
 HV4326  HISTORY     - Date     Condition        Report By
 HV4326  HISTORY     - 1932     MONUMENTED       CGS
 HV4326  HISTORY     - 1946     GOOD             CGS
 HV4326  HISTORY     - 1960     GOOD             MADHOP
 HV4326  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4326
 HV4326                          STATION DESCRIPTION
 HV4326
 HV4326'DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4326'STATION IS ON THE E SHORE OF THE POTOMAC RIVER BETWEEN THE RIVER
 HV4326'AND THE ROCK CREEK PARKWAY AT A POINT WHERE NEW HAMPSHIRE
 HV4326'AVENUE AND E STREET JOIN THE PARKWAY, AND IS NEAR THE TITANIC
 HV4326'MEMORIAL IN WEST POTOMAC PARK.
 HV4326'
 HV4326'THE STATION IS A STANDARD U.S.E. DISK STAMPED 897 AND IS SET
 HV4326'IN A 4-INCH CAST-IRON PIPE FILLED WITH CONCRETE, FLUSH WITH
 HV4326'THE GROUND, 17.0 FEET S OF THE S BUILDING LINE OF E STREET,
 HV4326'67.4 FEET W OF THE W CURB OF ROCK CREEK PARKWAY, ABOUT 40 FEET
 HV4326'S OF S WALL OF TITANIC MEMORIAL, AND 43.01 FEET E OF A 1/4-INCH
 HV4326'BRASS TUBE LEADED IN TOP OF SEA WALL.
 HV4326
 HV4326                          STATION RECOVERY (1960)
 HV4326
 HV4326'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV4326'THE STATION MARK RECOVERED IN GOOD CONDITION AS
 HV4326'DESCRIBED.  REFERENCE PLUG NO. 2 HAS BEEN DESTROYED.  REFERENCE
 HV4326'PLUG NO. 1 FOUND AS DESCRIBED.
 HV4326
 HV4326                          STATION RECOVERY (1971)
 HV4326
 HV4326'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4326'THIS STATION WAS DESTROYED WHEN THE PARKWAY WAS MOVED CLOSER TO
 HV4326'THE RIVER TO MAKE ROOM FOR A NEW BUILDING OF THE JOHN
 HV4326'F. KENNEDY CENTER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1379 ***********************************************************************
 HV1379  DESIGNATION -  CUA 1
 HV1379  PID         -  HV1379
 HV1379  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1379  COUNTRY     -  US
 HV1379  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1379
 HV1379                         *CURRENT SURVEY CONTROL
 HV1379  ______________________________________________________________________
 HV1379* NAD 83(1986) POSITION- 38 56 07.74   (N) 077 00 02.90   (W)   HD_HELD1
 HV1379* NAVD 88 ORTHO HEIGHT -    66.846 (meters)      219.31  (feet) ADJUSTED
 HV1379  ______________________________________________________________________
 HV1379  GEOID HEIGHT    -        -32.053 (meters)                     GEOID18
 HV1379  DYNAMIC HEIGHT  -         66.811 (meters)      219.20  (feet) COMP
 HV1379  MODELED GRAVITY -    980,108.0   (mgal)                       NAVD 88
 HV1379
 HV1379  VERT ORDER      -  FIRST     CLASS I
 HV1379
 HV1379.The horizontal coordinates were determined by differentially corrected
 HV1379.hand held GPS observations or other comparable positioning techniques
 HV1379.and have an estimated accuracy of +/- 3 meters.
 HV1379
 HV1379.The orthometric height was determined by differential leveling and
 HV1379.adjusted by the NATIONAL GEODETIC SURVEY
 HV1379.in June 1991.
 HV1379
 HV1379.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1379.GEOID18 height accuracy estimate available here.
 HV1379
 HV1379.Click photographs - Photos may exist for this station.
 HV1379
 HV1379.The dynamic height is computed by dividing the NAVD 88
 HV1379.geopotential number by the normal gravity value computed on the
 HV1379.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1379.degrees latitude (g = 980.6199 gals.).
 HV1379
 HV1379.The modeled gravity was interpolated from observed gravity values.
 HV1379
 HV1379
 HV1379_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2658211520(NAD 83)
 HV1379
 HV1379                          SUPERSEDED SURVEY CONTROL
 HV1379
 HV1379  NGVD 29 (11/26/84)   67.073  (m)          220.06   (f) ADJUSTED    1 1
 HV1379
 HV1379.Superseded values are not recommended for survey control.
 HV1379
 HV1379.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1379.See file dsdata.pdf to determine how the superseded data were derived.
 HV1379
 HV1379_MARKER: DB = BENCH MARK DISK
 HV1379_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1379_SP_SET: STEPS
 HV1379_STAMPING: C.U.A. NO 1 1933
 HV1379_MARK LOGO: CGS
 HV1379_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1379_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1379+SATELLITE: SATELLITE OBSERVATIONS - August 09, 2014
 HV1379
 HV1379  HISTORY     - Date     Condition        Report By
 HV1379  HISTORY     - 1933     MONUMENTED       CGS
 HV1379  HISTORY     - 1971     GOOD             NGS
 HV1379  HISTORY     - 20030626 GOOD             GEOCAC
 HV1379  HISTORY     - 20090319 GOOD             GEOCAC
 HV1379  HISTORY     - 20140809 GOOD             BASE9
 HV1379
 HV1379                          STATION DESCRIPTION
 HV1379
 HV1379'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1379'AT WASHINGTON.
 HV1379'AT WASHINGTON, D.C., AT THE SUBDIVISION OF BROOKLAND, ON THE
 HV1379'CAMPUS OF THE CATHOLIC UNIVERSITY OF AMERICA, SET IN THE TOP
 HV1379'AND 1.0 FOOT SOUTH OF THE NORTH END OF THE TOP STEP AT THE
 HV1379'WEST ENTRANCE TO CALDWEL HALL, 6 FEET EAST OF THE BOTTOM STEP,
 HV1379'AND ABOUT 4 FEET ABOVE THE LEVEL OF THE GROUND.
 HV1379
 HV1379                          STATION RECOVERY (2003)
 HV1379
 HV1379'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV1379'RECOVERED IN GOOD CONDITION.
 HV1379
 HV1379                          STATION RECOVERY (2009)
 HV1379
 HV1379'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV1379'RECOVERED IN GOOD CONDITION.
 HV1379
 HV1379                          STATION RECOVERY (2014)
 HV1379
 HV1379'RECOVERY NOTE BY BASE 9 GEODETIC CONSULTING SERVICE 2014 (DRD)
 HV1379'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1378 ***********************************************************************
 HV1378  DESIGNATION -  CUA 2
 HV1378  PID         -  HV1378
 HV1378  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1378  COUNTRY     -  US
 HV1378  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1378
 HV1378                         *CURRENT SURVEY CONTROL
 HV1378  ______________________________________________________________________
 HV1378* NAD 83(1986) POSITION- 38 55 55.14   (N) 076 59 58.99   (W)   HD_HELD1
 HV1378* NAVD 88 ORTHO HEIGHT -    58.275 (meters)      191.19  (feet) ADJUSTED
 HV1378  ______________________________________________________________________
 HV1378  GEOID HEIGHT    -        -32.060 (meters)                     GEOID18
 HV1378  DYNAMIC HEIGHT  -         58.245 (meters)      191.09  (feet) COMP
 HV1378  MODELED GRAVITY -    980,107.9   (mgal)                       NAVD 88
 HV1378
 HV1378  VERT ORDER      -  FIRST     CLASS II
 HV1378
 HV1378.The horizontal coordinates were determined by differentially corrected
 HV1378.hand held GPS observations or other comparable positioning techniques
 HV1378.and have an estimated accuracy of +/- 3 meters.
 HV1378
 HV1378.The orthometric height was determined by differential leveling and
 HV1378.adjusted by the NATIONAL GEODETIC SURVEY
 HV1378.in June 1991.
 HV1378
 HV1378.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1378.GEOID18 height accuracy estimate available here.
 HV1378
 HV1378.Click photographs - Photos may exist for this station.
 HV1378
 HV1378.The dynamic height is computed by dividing the NAVD 88
 HV1378.geopotential number by the normal gravity value computed on the
 HV1378.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1378.degrees latitude (g = 980.6199 gals.).
 HV1378
 HV1378.The modeled gravity was interpolated from observed gravity values.
 HV1378
 HV1378
 HV1378_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2666711129(NAD 83)
 HV1378
 HV1378                          SUPERSEDED SURVEY CONTROL
 HV1378
 HV1378  NGVD 29 (11/26/84)   58.504  (m)          191.94   (f) ADJUSTED    1 2
 HV1378
 HV1378.Superseded values are not recommended for survey control.
 HV1378
 HV1378.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1378.See file dsdata.pdf to determine how the superseded data were derived.
 HV1378
 HV1378_MARKER: DB = BENCH MARK DISK
 HV1378_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1378_SP_SET: DOORSILL
 HV1378_STAMPING: C.U.A. NO. 2 1933
 HV1378_MARK LOGO: CGS
 HV1378_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1378_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1378+SATELLITE: SATELLITE OBSERVATIONS - August 09, 2014
 HV1378
 HV1378  HISTORY     - Date     Condition        Report By
 HV1378  HISTORY     - 1933     MONUMENTED       CGS
 HV1378  HISTORY     - 1971     GOOD             NGS
 HV1378  HISTORY     - 20030626 GOOD             GEOCAC
 HV1378  HISTORY     - 20090319 GOOD             GEOCAC
 HV1378  HISTORY     - 20140809 GOOD             BASE9
 HV1378
 HV1378                          STATION DESCRIPTION
 HV1378
 HV1378'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1378'AT WASHINGTON.
 HV1378'AT WASHINGTON, D.C., AT THE SUBDIVISION OF BROOKLAND, ON THE
 HV1378'CAMPUS OF THE CATHOLIC UNIVERSITY OF AMERICA, SET IN THE TOP
 HV1378'OF THE SOUTH END OF THE GRANITE DOORSILL AT THE WEST ENTRANCE
 HV1378'TO THE BASEMENT OF GIBBONS HALL, 50 FEET NORTH OF THE CENTER
 HV1378'LINE OF MICHIGAN AVENUE, AND ABOUT 3 1/2 FEET BELOW THE LEVEL
 HV1378'OF THE GROUND.
 HV1378
 HV1378                          STATION RECOVERY (2003)
 HV1378
 HV1378'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV1378'RECOVERED IN GOOD CONDITION.
 HV1378
 HV1378                          STATION RECOVERY (2009)
 HV1378
 HV1378'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV1378'RECOVERED IN GOOD CONDITION.
 HV1378
 HV1378                          STATION RECOVERY (2014)
 HV1378
 HV1378'RECOVERY NOTE BY BASE 9 GEODETIC CONSULTING SERVICE 2014 (DRD)
 HV1378'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4263 ***********************************************************************
 HV4263  DESIGNATION -  CUP
 HV4263  PID         -  HV4263
 HV4263  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4263  COUNTRY     -  US
 HV4263  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4263
 HV4263                         *CURRENT SURVEY CONTROL
 HV4263  ______________________________________________________________________
 HV4263* NAD 83(1993) POSITION- 38 52 44.49126(N) 077 03 01.61374(W)   ADJUSTED
 HV4263* NAVD 88 ORTHO HEIGHT -     5.2   (meters)       17.    (feet) VERTCON3
 HV4263  ______________________________________________________________________
 HV4263  GEOID HEIGHT    -        -32.087 (meters)                     GEOID18
 HV4263  LAPLACE CORR    -         -2.78  (seconds)                    DEFLEC18
 HV4263  HORZ ORDER      -  THIRD
 HV4263
 HV4263.The horizontal coordinates were established by classical geodetic methods
 HV4263.and adjusted by the National Geodetic Survey in November 1994.
 HV4263
 HV4263.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4263.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4263
 HV4263.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4263.GEOID18 height accuracy estimate available here.
 HV4263
 HV4263.Click photographs - Photos may exist for this station.
 HV4263
 HV4263.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4263
 HV4263. The following values were computed from the NAD 83(1993) position.
 HV4263
 HV4263;                    North         East     Units Scale Factor Converg.
 HV4263;SPC MD       -   134,578.161   395,622.636   MT  0.99994985   -0 01 54.0
 HV4263;SPC MD       -   441,528.52  1,297,971.93   sFT  0.99994985   -0 01 54.0
 HV4263;SPC VA N     - 2,135,564.769 3,625,772.588   MT  0.99995877   +0 54 16.9
 HV4263;SPC VA N     - 7,006,432.08 11,895,555.57   sFT  0.99995877   +0 54 16.9
 HV4263;UTM  18      - 4,305,350.147   322,138.005   MT  0.99998956   -1 17 14.5
 HV4263
 HV4263!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4263!SPC MD       -   1.00000423  x   0.99994985  =   0.99995408
 HV4263!SPC VA N     -   1.00000423  x   0.99995877  =   0.99996300
 HV4263!UTM  18      -   1.00000423  x   0.99998956  =   0.99999379
 HV4263
 HV4263:                Primary Azimuth Mark                     Grid Az
 HV4263:SPC MD       -  MOTOR                                    072 10 13.6
 HV4263:SPC VA N     -  MOTOR                                    071 14 02.7
 HV4263:UTM  18      -  MOTOR                                    073 25 34.1
 HV4263
 HV4263_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2213805350(NAD 83)
 HV4263
 HV4263|---------------------------------------------------------------------|
 HV4263| PID    Reference Object                     Distance      Geod. Az  |
 HV4263|                                                           dddmmss.s |
 HV4263| HV4251 MOTOR                               APPROX. 0.7 KM 0720819.6 |
 HV4263| HV4524 GEORGIA                             379.012 METERS 31637     |
 HV4263|---------------------------------------------------------------------|
 HV4263
 HV4263                          SUPERSEDED SURVEY CONTROL
 HV4263
 HV4263  NAD 83(1991)-  38 52 44.48998(N)    077 03 01.61523(W) AD(       ) 3
 HV4263  NAD 83(1986)-  38 52 44.48969(N)    077 03 01.62587(W) AD(       ) 3
 HV4263  NAD 27      -  38 52 44.08600(N)    077 03 02.70500(W) AD(       ) 3
 HV4263  NGVD 29 (07/19/86)    5.4    (m)           18.     (f) VERT ANG       
 HV4263
 HV4263.Superseded values are not recommended for survey control.
 HV4263
 HV4263.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4263.See file dsdata.pdf to determine how the superseded data were derived.
 HV4263
 HV4263_MARKER: DE = TRAVERSE STATION DISK
 HV4263_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV4263_STAMPING: CUP 1935
 HV4263_MARK LOGO: CGS
 HV4263_PROJECTION: RECESSED 20 CENTIMETERS
 HV4263_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV4263+STABILITY: SURFACE MOTION
 HV4263
 HV4263  HISTORY     - Date     Condition        Report By
 HV4263  HISTORY     - 1935     MONUMENTED       CGS
 HV4263  HISTORY     - 1939     GOOD             CGS
 HV4263  HISTORY     - 1946     GOOD             CGS
 HV4263  HISTORY     - 1979     GOOD             NGS
 HV4263  HISTORY     - 20120511 GOOD             PROFLN
 HV4263
 HV4263                          STATION DESCRIPTION
 HV4263
 HV4263'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (LOC)
 HV4263'THIS TRAVERSE STATION IS A STANDARD BRONZE DISK STAMPED CUP 1935
 HV4263'SET IN THE TOP OF A CONCRETE MONUMENT, 8 INCHES IN DIAMETER AT THE
 HV4263'TOP, 14 INCHES SQUARE AT THE BOTTOM, AND 32 INCHES DEEP WITH THE
 HV4263'MARK 5 INCHES BELOW THE GROUND LEVEL, IN THE GRASS ABOUT 1/4
 HV4263'MILE NW OF THE SE END OF COLUMBIA ISLAND, 78.8 FEET NE OF THE
 HV4263'CENTER LINE OF TALL IRON LAMP POST NO. 34, WHICH IS ON THE SW
 HV4263'SIDE OF THE MOUNT VERNON HIGHWAY, 12.6 FEET NE OF THE STREET
 HV4263'EDGE OF THE NE SIDE (POTOMAC RIVER SIDE) OF THE MOUNT VERNON
 HV4263'HIGHWAY, 133.7 FEET SE OF THE CENTER LINE OF TALL IRON LAMP POST NO.
 HV4263'33, WHICH IS THE 14TH LAMP POST ON THE NE SIDE (POTOMAC RIVER
 HV4263'SIDE) OF THE MOUNT VERNON HIGHWAY STARTING WITH THE FIRST LAMP
 HV4263'POST WHICH IS ABOUT 15 FEET FROM THE ARLINGTON END OF THE
 HV4263'ARLINGTON MEMORIAL BRIDGE, 54.5 FEET SW OF THE CENTER LINE OF
 HV4263'THE CINDER BRIDLE PATH, 86.0 FEET SW OF WHERE THE BANK BREAKS
 HV4263'OFF SHARPLY TO THE WATER AND 169.2 FEET NW OF THE CENTER LINE
 HV4263'OF TALL IRON POST NO. 35, WHICH IS THE 15TH LAMP POST ON THE
 HV4263'NE SIDE OF THE MOUNT VERNON HIGHWAY STARTING WITH THE FIRST
 HV4263'LAMP POST WHICH IS ABOUT 15 FEET FROM THE ARLINGTON END OF THE
 HV4263'ARLINGTON MEMORIAL BRIDGE.  THE MARK IS THE 1/4-MARK FOR THE
 HV4263'1 MILE SPEEDBOAT RACE COURSE WITH THE START AT GATE - START.
 HV4263'
 HV4263'THE LINE BOAT-CUP IS 90 DEG TO THE AXIS OF THE RACE COURSE.
 HV4263'
 HV4263'NOTE--DISTANCES MEASURED ON THE GROUND OR SLOPE AS THE CASE
 HV4263'MAY BE.
 HV4263
 HV4263                          STATION RECOVERY (1939)
 HV4263
 HV4263'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4263'THIS STATION WAS RECOVERED IN GOOD CONDITION AND THE DESCRIPTION
 HV4263'IS ADEQUATE EXCEPT THAT THE REFERENCES TO LAMP POST NUMBERS IN THE
 HV4263'ORIGINAL DESCRIPTION SHOULD BE DISREGARDED AS THEY HAVE CHANGED.
 HV4263'THIS STATION IS DESCRIBED AND MARKED AS A TRAVERSE STATION.
 HV4263
 HV4263                          STATION RECOVERY (1946)
 HV4263
 HV4263'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4263'STATION RECOVERED AS DESCRIBED.  MARK IN GOOD CONDITION.
 HV4263'DESCRIPTION ADEQUATE.
 HV4263
 HV4263                          STATION RECOVERY (1979)
 HV4263
 HV4263'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 (BMP)
 HV4263'THE STATION IS ON COLUMBIA ISLAND A PART OF THE DISTRICT OF
 HV4263'COLUMBIA ON THE WEST OR VIRGINIA SIDE OF THE POTOMAC RIVER.
 HV4263'
 HV4263'TO REACH THE STATION FROM THE PARKING AREA FOR THE MARINERS
 HV4263'MEMORIAL AT THE SOUTH END OF THE ISLAND PROCEED NORTH ON THE
 HV4263'GEORGE WASHINGTON PARKWAY 0.25 KM (0.15 MI) TO THE STATION ON
 HV4263'THE RIGHT, RIVER SIDE, OF THE PARKWAY. ONE CAN PARK AT THE
 HV4263'PARKING AREA FOR THE MARINERS MEMORIAL OR ACROSS THE PARKWAY
 HV4263'AT A MARINA.
 HV4263'
 HV4263'THE STATION MARK IS A STANDARD TRAVERSE DISK STAMPED---CUP 1935---
 HV4263'SET IN A CONCRETE MONUMENT 10 CM BELOW GROUND LEVEL. IT IS IN
 HV4263'A GRASSY AREA AT THE TOP OF A SLOPE AMONG A GROUP OF DOGWOOD
 HV4263'TREES, 24.4 METERS (80.0 FT) NORTH OF A HIGHWAY SIGN READING
 HV4263'IWO JIMA MEMORIAL NETHERLANDS CARILLON FOLLOW 50 NEXT LEFT,
 HV4263'20.6 METERS (67.5 FT) NORTH OF THE NORTHEAST EDGE OF A METAL
 HV4263'CURB OF A CATCH BASIN, 16.3 METERS (53.5 FT) WEST OF THE WEST
 HV4263'SIDE OF A PAVED BICYCLE PATH, AND 3.8 METERS (12.45 FT)
 HV4263'EAST NORTHEAST OF THE CURB OF THE PARKWAY.
 HV4263
 HV4263                          STATION RECOVERY (2012)
 HV4263
 HV4263'RECOVERY NOTE BY PROFESSIONAL LAND SURVEYOR 2012 (JRO)
 HV4263'THE STATION IS ON COLUMBIA ISLAND ALONG THE EAST SIDE OF NORTHBOUND
 HV4263'GEORGE WASHINGTON MEMORIAL PARKWAY, ABOUT 0.5 MI (0.8 KM) NORTHEAST OF
 HV4263'THE PENTAGON.  OWNERSHIP--NATIONAL PARK SERVICE.
 HV4263'
 HV4263'PARKING FOR THE STATION IS AT THE LARGE LOT FOR LYNDON B. JOHNSON
 HV4263'GROVE, COLUMBIA ISLAND MARINA AND THE MARINERS MEMORIAL OFF SOUTHBOUND
 HV4263'G WEST MEMORIAL PARKWAY.  FROM THE SOUTH END OF THE LOT TAKE THE BIKE
 HV4263'PATH EAST UNDER THE PARKWAY OVERPASS AND THEN NORTHERLY ABOUT 0.3 MI
 HV4263'(0.5 KM) FROM THE MARINERS MEMORIAL TO THE MARK ON THE LEFT, UP THE
 HV4263'HILL BY THE PARKWAY.
 HV4263'
 HV4263'THE MARK IS 123.5 FT (37.6 M) NORTH-NORTHWEST OF A 30 INCH (76 CM)
 HV4263'MAPLE WHICH IS 38 FT (11.6 M) WEST OF THE BIKE PATH, 105.0 FT (32.0 M)
 HV4263'NORTH-NORTHWEST OF A 12 INCH (30 CM) MAPLE WHICH IS 20 FT (6.1 M) WEST
 HV4263'OF THE BIKE PATH, 81.0 FT (24.7 M) NORTH OF THE WESTERLY OF TWO 6X6
 HV4263'WOODEN SIGN POSTS HOLDING UP A BROWN SIGN READING IN PART--50 WEST,
 HV4263'ROSSLYN-KEY BRIDGE, US MARINE CORPS MEMORIAL--80.3 FT NORTH OF THE
 HV4263'EASTERLY SIGN POST, 112.2 FT (34.2 M) SOUTH-SOUTHEAST FROM THE CENTER
 HV4263'OF A MANHOLE AND THE SOUTHERLY EDGE OF THE STREETLIGHT BY THE MANHOLE,
 HV4263'107.2 FT (32.7 M) SOUTH-SOUTHEAST FROM THE SOUTHEAST CORNER OF A CATCH
 HV4263'BASIN, 58 FT (17.7 M) SOUTHWEST OF THE CENTER OF THE BIKE PATH
 HV4263'MEASURED ON THE SLOPE FROM RIGHT DOWN ON THE ASPHALT (ESTIMATED 12 FT
 HV4263'(3.7 M) BELOW THE MARK.  WHICH IS 8 INCHES (20 CM) BELOW THE GROUND IN
 HV4263'AN OPEN GRASSY AREA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4250 ***********************************************************************
 HV4250  DESIGNATION -  D
 HV4250  PID         -  HV4250
 HV4250  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4250  COUNTRY     -  US
 HV4250  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4250
 HV4250                         *CURRENT SURVEY CONTROL
 HV4250  ______________________________________________________________________
 HV4250* NAD 83(1993) POSITION- 38 53 59.47884(N) 077 03 46.79641(W)   ADJUSTED
 HV4250* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV4250  ______________________________________________________________________
 HV4250  GEOID HEIGHT    -        -32.034 (meters)                     GEOID18
 HV4250  LAPLACE CORR    -         -2.69  (seconds)                    DEFLEC18
 HV4250  HORZ ORDER      -  THIRD
 HV4250
 HV4250.The horizontal coordinates were established by classical geodetic methods
 HV4250.and adjusted by the National Geodetic Survey in November 1994.
 HV4250
 HV4250.The orthometric height was scaled from a topographic map.
 HV4250
 HV4250.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4250.GEOID18 height accuracy estimate available here.
 HV4250
 HV4250.Click photographs - Photos may exist for this station.
 HV4250
 HV4250.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4250
 HV4250. The following values were computed from the NAD 83(1993) position.
 HV4250
 HV4250;                    North         East     Units Scale Factor Converg.
 HV4250;SPC MD       -   136,891.117   394,535.212   MT  0.99994994   -0 02 22.3
 HV4250;SPC MD       -   449,116.94  1,294,404.27   sFT  0.99994994   -0 02 22.3
 HV4250;SPC VA N     - 2,137,859.668 3,624,647.499   MT  0.99996050   +0 53 48.7
 HV4250;SPC VA N     - 7,013,961.26 11,891,864.34   sFT  0.99996050   +0 53 48.7
 HV4250;UTM  18      - 4,307,686.481   321,101.497   MT  0.99999411   -1 17 45.0
 HV4250
 HV4250!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4250!SPC MD       -   1.00000491  x   0.99994994  =   0.99995485
 HV4250!SPC VA N     -   1.00000491  x   0.99996050  =   0.99996541
 HV4250!UTM  18      -   1.00000491  x   0.99999411  =   0.99999902
 HV4250
 HV4250_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2110107686(NAD 83)
 HV4250
 HV4250|---------------------------------------------------------------------|
 HV4250| PID    Reference Object                     Distance      Geod. Az  |
 HV4250|                                                           dddmmss.s |
 HV4250| HV4276 ELECTRIC                            236.536 METERS 01636     |
 HV4250| HV4450 SMOOT                               357.399 METERS 07306     |
 HV4250| HV4400 SCOW USE 1932                       257.891 METERS 12431     |
 HV4250| HV4535 DAM USE 1926 REF                    303.451 METERS 26507     |
 HV4250| HV4207 DAM                                 318.029 METERS 26730     |
 HV4250| HV4224 BARREL                              340.176 METERS 32923     |
 HV4250|---------------------------------------------------------------------|
 HV4250
 HV4250                          SUPERSEDED SURVEY CONTROL
 HV4250
 HV4250  NAD 83(1991)-  38 53 59.47760(N)    077 03 46.79797(W) AD(       ) 3
 HV4250  NAD 83(1986)-  38 53 59.47728(N)    077 03 46.80833(W) AD(       ) 3
 HV4250  NAD 27      -  38 53 59.07800(N)    077 03 47.88200(W) AD(       ) 3
 HV4250
 HV4250.Superseded values are not recommended for survey control.
 HV4250
 HV4250.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4250.See file dsdata.pdf to determine how the superseded data were derived.
 HV4250
 HV4250_MARKER: H = DRILL HOLE
 HV4250_SETTING: 80 = SET IN A BOULDER
 HV4250_MARK LOGO: USACE
 HV4250_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV4250+STABILITY: SURFACE MOTION
 HV4250
 HV4250  HISTORY     - Date     Condition        Report By
 HV4250  HISTORY     - 1932     MONUMENTED       CGS
 HV4250  HISTORY     - 1946     GOOD             CGS
 HV4250  HISTORY     - 1980     GOOD             NGS
 HV4250
 HV4250                          STATION DESCRIPTION
 HV4250
 HV4250'DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4250'THE STATION IS ON ROOSEVELT ISLAND (FORMERLY CALLED ANALOSTAN
 HV4250'ISLAND) WHICH LIES BETWEEN THE POTOMAC AND LITTLE RIVERS
 HV4250'AND IS ABREAST OF THE MOUTH OF ROCK CREEK.  STATION IS ON
 HV4250'THE N SHORE OF THE ISLAND, ABOUT ON THE CENTER LINE OF
 HV4250'WISCONSIN AVENUE EXTENDED, AT A ROCKY POINT.  THE ROCK ON WHICH
 HV4250'THE STATION IS LOCATED IS NOT AWASH, IS ONE OF SEVERAL ROCKS
 HV4250'IN A CLUMP OF BUSHES JUST BACK OF THE HIGH-WATER LINE AND ABOUT
 HV4250'6 FEET ABOVE MEAN LOW WATER.  STATION IS A U.S.E. 1/4-INCH
 HV4250'BRASS PLUG LEADED INTO A 1-INCH DRILL HOLE IN THE TOP OF A
 HV4250'LARGE BOULDER.
 HV4250'
 HV4250'THE 18-INCH ELM IS BROKEN OFF, LEAVING A STUMP.  THE UPSTREAM
 HV4250'HICKORY IS OUT.
 HV4250
 HV4250                          STATION RECOVERY (1980)
 HV4250
 HV4250'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1980 (BMP)
 HV4250'THE STATION IS ON THE UPRIVER AND WASHINGTON SIDE OF THEODORE
 HV4250'ROOSEVELT ISLAND IN THE POTOMAC RIVER IN WASHINGTON D.C.
 HV4250'
 HV4250'TO REACH THE ISLAND HEADING NORTH ON THE GEORGE WASHINGTON
 HV4250'PARKWAY ON THE VIRGINIA SIDE OF THE POTOMAC RIVER ENTER THE
 HV4250'PARKING AREA IMMEDIATELY NORTH OF THE ROOSEVELT BRIDGE. A
 HV4250'FOOT BRIDGE LEADS TO THE ISLAND AT ABOUT MIDPOINT IN THE
 HV4250'ISLAND. A SMALL VEHICLE COULD BE USED WITH PERMISSION OF THE
 HV4250'U.S. PARK SERVICE. FROM THE EAST EDGE OF THE BRIDGE TURN RIGHT
 HV4250'SOUTH FOR 85 METERS TO A ROAD CALLED THE WOODS TRAIL. TURN LEFT SOUTH
 HV4250'FOR FOR 350 METERS TO A CROSS TRAIL, TURN RIGHT FOR 224 METERS
 HV4250'TO A PLAQUE MARKING THE GEORGETOWN WATER FRONT, CONTINUE
 HV4250'APPROXIMATELY 20 METERS TO A POINT OF ROCKS EXTENDING INTO THE
 HV4250'RIVER ON THE LEFT.
 HV4250'
 HV4250'THE MARK IS A LEADED DRILL HOLE WITH A PUNCH HOLE SET IN THE
 HV4250'CENTER OF A METER WIDE ROCK ON THE SHORE EDGE OF THE POINT
 HV4250'ABOUT A METER NORTH OF A DOZEN HARDENED QUITE OLD BAGS OF
 HV4250'CEMENT. IT IS 6.2 METERS (20.2 FT) NORTH NORTHWEST OF A 0.76 METER
 HV4250'OAK TREE, 7.6 METERS (24.8 FT) EAST NORTHEAST OF A 0.3 METER
 HV4250'LOCUST AND APPROXIMATELY 0.8 METERS ABOVE HIGH WATER.
 HV4250'
 HV4250'THIS STATION WAS NOT OCCUPIED AT THIS TIME.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4285 ***********************************************************************
 HV4285  DESIGNATION -  D 1913
 HV4285  PID         -  HV4285
 HV4285  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4285  COUNTRY     -  US
 HV4285  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4285
 HV4285                         *CURRENT SURVEY CONTROL
 HV4285  ______________________________________________________________________
 HV4285* NAD 83(1993) POSITION- 38 53 18.76452(N) 077 03 06.66301(W)   ADJUSTED
 HV4285* NAVD 88 ORTHO HEIGHT -    10.    (meters)       33.    (feet) SCALED
 HV4285  ______________________________________________________________________
 HV4285  GEOID HEIGHT    -        -32.069 (meters)                     GEOID18
 HV4285  LAPLACE CORR    -         -2.56  (seconds)                    DEFLEC18
 HV4285  HORZ ORDER      -  THIRD
 HV4285
 HV4285.The horizontal coordinates were established by classical geodetic methods
 HV4285.and adjusted by the National Geodetic Survey in November 1994.
 HV4285
 HV4285.The orthometric height was scaled from a topographic map.
 HV4285
 HV4285.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4285.GEOID18 height accuracy estimate available here.
 HV4285
 HV4285.Click photographs - Photos may exist for this station.
 HV4285
 HV4285.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4285
 HV4285. The following values were computed from the NAD 83(1993) position.
 HV4285
 HV4285;                    North         East     Units Scale Factor Converg.
 HV4285;SPC MD       -   135,635.061   395,501.536   MT  0.99994987   -0 01 57.2
 HV4285;SPC MD       -   444,996.03  1,297,574.62   sFT  0.99994987   -0 01 57.2
 HV4285;SPC VA N     - 2,136,619.559 3,625,634.231   MT  0.99995955   +0 54 13.7
 HV4285;SPC VA N     - 7,009,892.67 11,895,101.64   sFT  0.99995955   +0 54 13.7
 HV4285;UTM  18      - 4,306,409.490   322,040.093   MT  0.99998999   -1 17 18.6
 HV4285
 HV4285!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4285!SPC MD       -   1.00000350  x   0.99994987  =   0.99995337
 HV4285!SPC VA N     -   1.00000350  x   0.99995955  =   0.99996305
 HV4285!UTM  18      -   1.00000350  x   0.99998999  =   0.99999349
 HV4285
 HV4285_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2204006409(NAD 83)
 HV4285
 HV4285                          SUPERSEDED SURVEY CONTROL
 HV4285
 HV4285  NAD 83(1991)-  38 53 18.76327(N)    077 03 06.66454(W) AD(       ) 3
 HV4285  NAD 83(1986)-  38 53 18.76300(N)    077 03 06.67509(W) AD(       ) 3
 HV4285  NAD 27      -  38 53 18.36400(N)    077 03 07.75200(W) AD(       ) 3
 HV4285  USSD        -  38 53 18.70200(N)    077 03 07.58400(W) AD(       ) 3
 HV4285
 HV4285.Superseded values are not recommended for survey control.
 HV4285
 HV4285.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4285.See file dsdata.pdf to determine how the superseded data were derived.
 HV4285
 HV4285_MARKER: I = METAL ROD
 HV4285_SETTING: 0 = UNSPECIFIED SETTING
 HV4285_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4285
 HV4285  HISTORY     - Date     Condition        Report By
 HV4285  HISTORY     - 1913     MONUMENTED       CGS
 HV4285  HISTORY     - 1940     SEE DESCRIPTION  CGS
 HV4285
 HV4285                          STATION DESCRIPTION
 HV4285
 HV4285'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4285'STATION IS IN CONCRETE MONUMENT, 8-INCH CAST-IRON PIPE, CENTERED
 HV4285'WITH 1/4-INCH BRASS ROD, 0.1 FOOT ABOVE GROUND, ABOUT 6
 HV4285'FEET ABOVE MEAN LOW WATER, 6.5 FEET E OF EDGE OF WALL, 18.8
 HV4285'FEET W OF 15-INCH WILLOW TREE, 51.8 FEET SW OF 6-INCH SILVER
 HV4285'BIRCH TREE, AND 60.3 FEET SW OF 6-INCH SILVER BIRCH TREE.
 HV4285
 HV4285                          STATION RECOVERY (1940)
 HV4285
 HV4285'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV4285'STATION IS LOST.  DESTROYED BY CONSTRUCTION OF LINCOLN MEMORIAL
 HV4285'AND THE DRIVES IN THE VICINITY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1783 ***********************************************************************
 HV1783  DESIGNATION -  D 2
 HV1783  PID         -  HV1783
 HV1783  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1783  COUNTRY     -  US
 HV1783  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1783
 HV1783                         *CURRENT SURVEY CONTROL
 HV1783  ______________________________________________________________________
 HV1783* NAD 83(1986) POSITION- 38 58 30.     (N) 077 01 03.     (W)   SCALED
 HV1783* NAVD 88 ORTHO HEIGHT -    87.586 (meters)      287.36  (feet) ADJUSTED
 HV1783  ______________________________________________________________________
 HV1783  GEOID HEIGHT    -        -31.998 (meters)                     GEOID18
 HV1783  DYNAMIC HEIGHT  -         87.539 (meters)      287.20  (feet) COMP
 HV1783  MODELED GRAVITY -    980,092.5   (mgal)                       NAVD 88
 HV1783
 HV1783  VERT ORDER      -  SECOND    CLASS 0
 HV1783
 HV1783.The horizontal coordinates were scaled from a map and have
 HV1783.an estimated accuracy of +/- 6 seconds.
 HV1783
 HV1783.The orthometric height was determined by differential leveling and
 HV1783.adjusted by the NATIONAL GEODETIC SURVEY
 HV1783.in June 1991.
 HV1783
 HV1783.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1783.GEOID18 height accuracy estimate available here.
 HV1783
 HV1783.Click photographs - Photos may exist for this station.
 HV1783
 HV1783.The dynamic height is computed by dividing the NAVD 88
 HV1783.geopotential number by the normal gravity value computed on the
 HV1783.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1783.degrees latitude (g = 980.6199 gals.).
 HV1783
 HV1783.The modeled gravity was interpolated from observed gravity values.
 HV1783
 HV1783
 HV1783_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ252159(NAD 83)
 HV1783
 HV1783                          SUPERSEDED SURVEY CONTROL
 HV1783
 HV1783  NGVD 29 (11/26/84)   87.816  (m)          288.11   (f) ADJUSTED    2 0
 HV1783
 HV1783.Superseded values are not recommended for survey control.
 HV1783
 HV1783.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1783.See file dsdata.pdf to determine how the superseded data were derived.
 HV1783
 HV1783_MARKER: DB = BENCH MARK DISK
 HV1783_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1783_SP_SET: BRIDGE
 HV1783_STAMPING: D 2 1933
 HV1783_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1783
 HV1783  HISTORY     - Date     Condition        Report By
 HV1783  HISTORY     - 1933     MONUMENTED       CGS
 HV1783  HISTORY     - 1960     GOOD             CGS
 HV1783  HISTORY     - 19900406 MARK NOT FOUND   NGS
 HV1783
 HV1783                          STATION DESCRIPTION
 HV1783
 HV1783'DESCRIBED BY COAST AND GEODETIC SURVEY 1933
 HV1783'AT TAKOMA PARK.
 HV1783'AT TAKOMA PARK, D.C., ON THE METROOLITAN BRANCH OF THE BALTIMORE
 HV1783'AND OHIO RAILROAD, 120 FEET NORTH OF THE STATION, AT THE BRIDGE
 HV1783'OVER CEDAR STREET, IN THE TOP OF THE RETAINING WALL, 27 FEET WEST
 HV1783'OF THE CENTERLINE OF THE SOUTHBOUND TRACK, 6 FEET SOUTH OF THE
 HV1783'NORTH END OF THE WEST RETAINING WALL, 0.5 FOOT EAST OF THE IRON
 HV1783'RAILING, AND ABOUT 6 INCHES ABOVE THE TOP OF THE RAIL.  A STANDARD
 HV1783'DISK, STAMPED D 2 1933.
 HV1783
 HV1783                          STATION RECOVERY (1960)
 HV1783
 HV1783'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1783'RECOVERED IN GOOD CONDITION.
 HV1783
 HV1783                          STATION RECOVERY (1990)
 HV1783
 HV1783'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990
 HV1783'A THOROUGH SEARCH OF THE DESCRIBED AREA REVEALED NO EVIDENCE OF THE
 HV1783'MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1330 ***********************************************************************
 HV1330  DESIGNATION -  D 3
 HV1330  PID         -  HV1330
 HV1330  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1330  COUNTRY     -  US
 HV1330  USGS QUAD   -  ANACOSTIA (2016)
 HV1330
 HV1330                         *CURRENT SURVEY CONTROL
 HV1330  ______________________________________________________________________
 HV1330* NAD 83(1986) POSITION- 38 50 13.     (N) 076 59 36.     (W)   SCALED
 HV1330* NAVD 88 ORTHO HEIGHT -    23.876 (meters)       78.33  (feet) ADJUSTED
 HV1330  ______________________________________________________________________
 HV1330  GEOID HEIGHT    -        -32.240 (meters)                     GEOID18
 HV1330  DYNAMIC HEIGHT  -         23.863 (meters)       78.29  (feet) COMP
 HV1330  MODELED GRAVITY -    980,087.5   (mgal)                       NAVD 88
 HV1330
 HV1330  VERT ORDER      -  FIRST     CLASS II
 HV1330
 HV1330.The horizontal coordinates were scaled from a map and have
 HV1330.an estimated accuracy of +/- 6 seconds.
 HV1330
 HV1330.The orthometric height was determined by differential leveling and
 HV1330.adjusted by the NATIONAL GEODETIC SURVEY
 HV1330.in June 1991.
 HV1330
 HV1330.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1330.GEOID18 height accuracy estimate available here.
 HV1330
 HV1330.Click photographs - Photos may exist for this station.
 HV1330
 HV1330.The dynamic height is computed by dividing the NAVD 88
 HV1330.geopotential number by the normal gravity value computed on the
 HV1330.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1330.degrees latitude (g = 980.6199 gals.).
 HV1330
 HV1330.The modeled gravity was interpolated from observed gravity values.
 HV1330
 HV1330
 HV1330_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ269005(NAD 83)
 HV1330
 HV1330                          SUPERSEDED SURVEY CONTROL
 HV1330
 HV1330  NGVD 29 (11/26/84)   24.118  (m)           79.13   (f) ADJUSTED    1 2
 HV1330
 HV1330.Superseded values are not recommended for survey control.
 HV1330
 HV1330.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1330.See file dsdata.pdf to determine how the superseded data were derived.
 HV1330
 HV1330_MARKER: DB = BENCH MARK DISK
 HV1330_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1330_SP_SET: BRIDGE
 HV1330_STAMPING: D 3 1952
 HV1330_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1330
 HV1330  HISTORY     - Date     Condition        Report By
 HV1330  HISTORY     - 1952     MONUMENTED       CGS
 HV1330  HISTORY     - 1960     GOOD             CGS
 HV1330
 HV1330                          STATION DESCRIPTION
 HV1330
 HV1330'DESCRIBED BY COAST AND GEODETIC SURVEY 1952
 HV1330'AT WASHINGTON.
 HV1330'IN THE SOUTHEAST SECTION OF WASHINGTON, D.C., AT THE WHEELER
 HV1330'ROAD BRIDGE OVER OXON RUN, AT THE SOUTHWEST CORNER OF THE BRIDGE,
 HV1330'AT SIDEWALK LEVEL, 5.5 FEET WEST OF THE FACE OF THE CURB, AND
 HV1330'0.5 FOOT EAST OF THE EAST FACE OF A GRANITE-TOPPED STONE WALL
 HV1330'UNDER A STEEL RAILING.  A BRASS DISK, STAMPED D 3 1952.
 HV1330
 HV1330                          STATION RECOVERY (1960)
 HV1330
 HV1330'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1330'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV0872 ***********************************************************************
 HV0872  DESIGNATION -  D 5
 HV0872  PID         -  HV0872
 HV0872  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV0872  COUNTRY     -  US
 HV0872  USGS QUAD   -  WASHINGTON EAST (2016)
 HV0872
 HV0872                         *CURRENT SURVEY CONTROL
 HV0872  ______________________________________________________________________
 HV0872* NAD 83(1986) POSITION- 38 52 59.1    (N) 076 59 24.9    (W)   HD_HELD2
 HV0872* NAVD 88 ORTHO HEIGHT -    23.199 (meters)       76.11  (feet) ADJUSTED
 HV0872  ______________________________________________________________________
 HV0872  GEOID HEIGHT    -        -32.174 (meters)                     GEOID18
 HV0872  DYNAMIC HEIGHT  -         23.187 (meters)       76.07  (feet) COMP
 HV0872  MODELED GRAVITY -    980,098.0   (mgal)                       NAVD 88
 HV0872
 HV0872  VERT ORDER      -  FIRST     CLASS I
 HV0872
 HV0872.The horizontal coordinates were established by autonomous hand held GPS
 HV0872.observations and have an estimated accuracy of +/- 10 meters.
 HV0872
 HV0872.The orthometric height was determined by differential leveling and
 HV0872.adjusted by the NATIONAL GEODETIC SURVEY
 HV0872.in June 1991.
 HV0872
 HV0872.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV0872.GEOID18 height accuracy estimate available here.
 HV0872
 HV0872.Click photographs - Photos may exist for this station.
 HV0872
 HV0872.The dynamic height is computed by dividing the NAVD 88
 HV0872.geopotential number by the normal gravity value computed on the
 HV0872.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV0872.degrees latitude (g = 980.6199 gals.).
 HV0872
 HV0872.The modeled gravity was interpolated from observed gravity values.
 HV0872
 HV0872
 HV0872_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2737005684(NAD 83)
 HV0872
 HV0872                          SUPERSEDED SURVEY CONTROL
 HV0872
 HV0872  NGVD 29 (11/26/84)   23.437  (m)           76.89   (f) ADJUSTED    1 1
 HV0872
 HV0872.Superseded values are not recommended for survey control.
 HV0872
 HV0872.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV0872.See file dsdata.pdf to determine how the superseded data were derived.
 HV0872
 HV0872_STAMPING: D 5 1971
 HV0872_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV0872+SATELLITE: SATELLITE OBSERVATIONS - May 14, 2005
 HV0872
 HV0872  HISTORY     - Date     Condition        Report By
 HV0872  HISTORY     - 1971     MONUMENTED       NGS
 HV0872  HISTORY     - 20050514 GOOD             GEOCAC
 HV0872  HISTORY     - 20051230 GOOD             GEOCAC
 HV0872  HISTORY     - 20200113 MARK NOT FOUND   ARCSHE
 HV0872
 HV0872                          STATION DESCRIPTION
 HV0872
 HV0872'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV0872'AT WASHINGTON.
 HV0872'AT WASHINGTON, D.C., ABOUT 0.8 MILE SOUTHEAST ALONG PENNSYLVANIA
 HV0872'AVENUE FROM THE JUNCTION OF INDEPENDENCE AVENUE, IN THE NORTHEAST
 HV0872'ANGLE OF SE E AND SE 12TH STREETS, AT THE CATHARINE R. WATKINS
 HV0872'ELEMENTARY SCHOOL, SET IN THE TOP OF THE SOUTHWEST SIDE OF THE
 HV0872'12-FOOT CONCRETE FOUNDATION FOR A FLAGPOLE, 78 YARDS NORTH OF THE
 HV0872'NORTHEAST CURB OF THE NORTHEAST LANES OF PENNSYLVANIA AVENUE,
 HV0872'26.7 FEET EAST OF THE EAST CURB OF SE 12TH STREET, 67.5 FEET
 HV0872'NORTH OF THE NORTH CURB OF SE E STREET, 30.3 FEET NORTHWEST OF
 HV0872'THE NORTHWEST CORNER OF THE SCHOOL BUILDING, AND ABOUT 4 FEET
 HV0872'ABOVE THE LEVEL OF THE STREET.  NOTE-- THIS PARTY WAS INFORMED
 HV0872'THAT THE CONCRETE FOUNDATION FOR THE FLAGPOLE WAS IN EXCESS OF
 HV0872'4 FEET DEEP.
 HV0872
 HV0872                          STATION RECOVERY (2005)
 HV0872
 HV0872'RECOVERY NOTE BY GEOCACHING 2005 (APC)
 HV0872'RECOVERED IN GOOD CONDITION.
 HV0872
 HV0872                          STATION RECOVERY (2005)
 HV0872
 HV0872'RECOVERY NOTE BY GEOCACHING 2005 (KDD)
 HV0872'CORRECT NAME OF SCHOOL IS CATHARINE R. WATKINS ELEMENTARY SCHOOL.
 HV0872
 HV0872                          STATION RECOVERY (2020)
 HV0872
 HV0872'RECOVERY NOTE BY ARCHER-SHEE LAND SURVEYING 2020 (MRA)
 HV0872'NEW FLAGPOLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8079 ***********************************************************************
 HV8079  DESIGNATION -  D 8
 HV8079  PID         -  HV8079
 HV8079  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8079  COUNTRY     -  US
 HV8079  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8079
 HV8079                         *CURRENT SURVEY CONTROL
 HV8079  ______________________________________________________________________
 HV8079* NAD 83(1986) POSITION- 38 54 28.1    (N) 077 04 22.7    (W)   HD_HELD2
 HV8079* NAVD 88 ORTHO HEIGHT -    43.682 (meters)      143.31  (feet) ADJUSTED
 HV8079  ______________________________________________________________________
 HV8079  GEOID HEIGHT    -        -32.005 (meters)                     GEOID18
 HV8079  DYNAMIC HEIGHT  -         43.658 (meters)      143.23  (feet) COMP
 HV8079  MODELED GRAVITY -    980,091.5   (mgal)                       NAVD 88
 HV8079
 HV8079  VERT ORDER      -  FIRST     CLASS I
 HV8079
 HV8079.The horizontal coordinates were established by autonomous hand held GPS
 HV8079.observations and have an estimated accuracy of +/- 10 meters.
 HV8079
 HV8079.The orthometric height was determined by differential leveling and
 HV8079.adjusted by the NATIONAL GEODETIC SURVEY
 HV8079.in June 1991.
 HV8079
 HV8079.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8079.GEOID18 height accuracy estimate available here.
 HV8079
 HV8079.Click photographs - Photos may exist for this station.
 HV8079
 HV8079.The dynamic height is computed by dividing the NAVD 88
 HV8079.geopotential number by the normal gravity value computed on the
 HV8079.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8079.degrees latitude (g = 980.6199 gals.).
 HV8079
 HV8079.The modeled gravity was interpolated from observed gravity values.
 HV8079
 HV8079
 HV8079_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2025608588(NAD 83)
 HV8079
 HV8079                          SUPERSEDED SURVEY CONTROL
 HV8079
 HV8079  NGVD 29 (11/26/84)   43.913  (m)          144.07   (f) ADJUSTED    1 1
 HV8079
 HV8079.Superseded values are not recommended for survey control.
 HV8079
 HV8079.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8079.See file dsdata.pdf to determine how the superseded data were derived.
 HV8079
 HV8079_MARKER: DV = VERTICAL CONTROL DISK
 HV8079_SETTING: 34 = SET IN THE FOOTINGS OF SMALL/MEDIUM STRUCTURES
 HV8079_SP_SET: FOUNDATION
 HV8079_STAMPING: D 8 1984
 HV8079_MARK LOGO: NGS
 HV8079_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV8079+STABILITY: SURFACE MOTION
 HV8079_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV8079+SATELLITE: SATELLITE OBSERVATIONS - November 19, 2006
 HV8079
 HV8079  HISTORY     - Date     Condition        Report By
 HV8079  HISTORY     - 1935     MONUMENTED       NGS
 HV8079  HISTORY     - 19900330 GOOD             NGS
 HV8079  HISTORY     - 20061119 GOOD             GEOCAC
 HV8079
 HV8079                          STATION DESCRIPTION
 HV8079
 HV8079'DESCRIBED BY NATIONAL GEODETIC SURVEY 1935
 HV8079'IN WASHINGTON DC.
 HV8079'IN WASHINGTON DC, ON THE GROUNDS OF GEORGETOWN UNIVERSITY, IN THE TOP
 HV8079'OF THE SOUTHEAST CORNER OF A LARGE 10- BY 15-FOOT CONCRETE TRANSFORMER
 HV8079'VAULT WITH STEEL GRATE, 6.55 METERS (21.5 FEET) EAST OF THE SOUTHEAST
 HV8079'CORNER OF THE RIGGS NATIONAL BANK BUILDING.
 HV8079
 HV8079                          STATION RECOVERY (1990)
 HV8079
 HV8079'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990
 HV8079'IN WASHINGTON DC, AT GEORGETOWN UNIVERSITY, IN THE SOUTHEAST CORNER OF
 HV8079'A 10 BY 16 FOOT CONCRETE FOUNDATION FOR AN ELECTRIC VAULT, 6.6 M
 HV8079'(21.65 FT) EAST OF THE SOUTHEAST CORNER OF THE RIGGS NATIONAL BANK,
 HV8079'AND LEVEL WITH A STREET.
 HV8079
 HV8079                          STATION RECOVERY (2006)
 HV8079
 HV8079'RECOVERY NOTE BY GEOCACHING 2006 (APC)
 HV8079'FOUND AS DESCRIBED, EXCEPT THE FORMER RIGGS NATIONAL BANK IS NOW, OR
 HV8079'HAS BEEN REPLACED BY, THE DAVIS PERFORMING ARTS CENTER, INCLUDING THE
 HV8079'GONDA THEATER.
 HV8079'
 HV8079'DISK IS SET HORIZONTALLY IN THE CONCRETE FRAME AROUND A STEEL GRATE IN
 HV8079'THE STREET.
 HV8079'
 HV8079'IT IS LOCATED BEHIND (WEST OF) THE SOUTHWEST CORNER OF COPLEY HALL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4207 ***********************************************************************
 HV4207  DESIGNATION -  DAM
 HV4207  PID         -  HV4207
 HV4207  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4207  COUNTRY     -  US
 HV4207  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4207
 HV4207                         *CURRENT SURVEY CONTROL
 HV4207  ______________________________________________________________________
 HV4207* NAD 83(1993) POSITION- 38 53 59.02947(N) 077 03 59.98185(W)   ADJUSTED
 HV4207* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV4207  ______________________________________________________________________
 HV4207  GEOID HEIGHT    -        -32.029 (meters)                     GEOID18
 HV4207  LAPLACE CORR    -         -2.81  (seconds)                    DEFLEC18
 HV4207  HORZ ORDER      -  THIRD
 HV4207
 HV4207.The horizontal coordinates were established by classical geodetic methods
 HV4207.and adjusted by the National Geodetic Survey in November 1994.
 HV4207
 HV4207.The orthometric height was scaled from a topographic map.
 HV4207
 HV4207.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4207.GEOID18 height accuracy estimate available here.
 HV4207
 HV4207.Click photographs - Photos may exist for this station.
 HV4207
 HV4207.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4207
 HV4207. The following values were computed from the NAD 83(1993) position.
 HV4207
 HV4207;                    North         East     Units Scale Factor Converg.
 HV4207;SPC MD       -   136,877.486   394,217.492   MT  0.99994993   -0 02 30.6
 HV4207;SPC MD       -   449,072.22  1,293,361.89   sFT  0.99994993   -0 02 30.6
 HV4207;SPC VA N     - 2,137,840.846 3,624,330.040   MT  0.99996049   +0 53 40.5
 HV4207;SPC VA N     - 7,013,899.51 11,890,822.81   sFT  0.99996049   +0 53 40.5
 HV4207;UTM  18      - 4,307,679.819   320,783.540   MT  0.99999551   -1 17 53.2
 HV4207
 HV4207!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4207!SPC MD       -   1.00000491  x   0.99994993  =   0.99995484
 HV4207!SPC VA N     -   1.00000491  x   0.99996049  =   0.99996540
 HV4207!UTM  18      -   1.00000491  x   0.99999551  =   1.00000042
 HV4207
 HV4207:                Primary Azimuth Mark                     Grid Az
 HV4207:SPC MD       -  POWER 1913                               057 06 22.4
 HV4207:SPC VA N     -  POWER 1913                               056 10 11.3
 HV4207:UTM  18      -  POWER 1913                               058 21 45.0
 HV4207
 HV4207_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2078307679(NAD 83)
 HV4207
 HV4207|---------------------------------------------------------------------|
 HV4207| PID    Reference Object                     Distance      Geod. Az  |
 HV4207|                                                           dddmmss.s |
 HV4207| HV4224 BARREL                              338.904 METERS 02513     |
 HV4207| HV4453 POWER 1913                          453.750 METERS 0570351.8 |
 HV4207| HV4276 ELECTRIC                            454.199 METERS 0580113.5 |
 HV4207| HV4250 D                                   318.029 METERS 08730     |
 HV4207| DE4967 DAM RM                                             12754     |
 HV4207| HV4448 VIRGINIA BASE USE 1932              360.966 METERS 30248     |
 HV4207| HV4195 BRIDGE                              384.559 METERS 30530     |
 HV4207| HV3961 GEORGETOWN UNIV LOWER SPIRE         APPROX. 1.0 KM 3260722.6 |
 HV4207| HV4458 WASHINGTON BASE USE 1932            APPROX. 0.5 KM 3354455.5 |
 HV4207|---------------------------------------------------------------------|
 HV4207
 HV4207                          SUPERSEDED SURVEY CONTROL
 HV4207
 HV4207  NAD 83(1991)-  38 53 59.02823(N)    077 03 59.98342(W) AD(       ) 3
 HV4207  NAD 83(1986)-  38 53 59.02797(N)    077 03 59.99368(W) AD(       ) 3
 HV4207  NAD 27      -  38 53 58.62800(N)    077 04 01.06700(W) AD(       ) 3
 HV4207
 HV4207.Superseded values are not recommended for survey control.
 HV4207
 HV4207.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4207.See file dsdata.pdf to determine how the superseded data were derived.
 HV4207
 HV4207_MARKER: DB = BENCH MARK DISK
 HV4207_SETTING: 17 = SET INTO TOP OF METAL PIPE DRIVEN INTO GROUND
 HV4207_MARK LOGO: USACE
 HV4207_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4207
 HV4207  HISTORY     - Date     Condition        Report By
 HV4207  HISTORY     - 1926     MONUMENTED       USACE
 HV4207  HISTORY     - 1935     GOOD             CGS
 HV4207  HISTORY     - 1946     SEE DESCRIPTION  CGS
 HV4207
 HV4207                          STATION DESCRIPTION
 HV4207
 HV4207'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1926
 HV4207'STATION IS U.S.E.D. COM. MONUMENT IN 6-INCH CAST-IRON PIPE
 HV4207'0.2 FOOT ABOVE SURFACE NO. 158 AT EXTREME UPPER END OF ANALOSTIAN
 HV4207'ISLAND.
 HV4207'
 HV4207'REFERENCE MARK NO. 1 IS A NAIL IN BLAZE ON 18-INCH ELM.  DISTANT
 HV4207'40.45 FEET ANGLE FROM BARREL 157 DEG 51 MIN.
 HV4207'
 HV4207'REFERENCE MARK NO. 2 IS A NAIL IN BLAZE ON 24-INCH ELM.  DISTANT
 HV4207'37.6 FEET ANGLE FROM BARREL 188 DEG 49 MIN 30 SEC.
 HV4207'
 HV4207'DAM REFERENCE MONUMENT IS U.S.E.D. COM. MONUMENT IN 6-INCH
 HV4207'CAST-IRON PIPE NO. 153 0.3 FOOT ABOVE SURFACE.  REFERENCE
 HV4207'IS A NAIL IN BLAZE DOUBLE ELM 20-INCHES DIAMETER, DISTANT
 HV4207'42.65 FEET.
 HV4207'
 HV4207'REFERENCE MARK NO. 4 IS A NAIL IN BLAZE 20-INCH ELM 33.76 FEET
 HV4207'FROM REFERENCE MONUMENT.
 HV4207'
 HV4207'DISTANCE DAM TO DAM REFERENCE MONUMENT 64.085 FEET.
 HV4207
 HV4207                          STATION RECOVERY (1935)
 HV4207
 HV4207'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4207'STATION IS SITUATED ON THE EXTREME NORTHWESTERN TIP OF THEODORE
 HV4207'ROOSEVELT ISLAND IN THE POTOMAC RIVER, ABOUT 350 YARDS BELOW
 HV4207'KEY BRIDGE, ABOUT 3 FEET IN FROM HIGH-WATER LINE.  THERE IS A
 HV4207'SMALL CONCRETE RETAINING WALL BUILT AROUND THE STATION TO THE
 HV4207'NW AND NE, EVIDENTLY TO KEEP THE MARK FROM WASHING OUT.  THE
 HV4207'STATION IS A U.S.E. TABLET SET IN CONCRETE IN A 6-INCH
 HV4207'CAST-IRON PIPE, PROJECTING ABOUT 3 INCHES ABOVE THE GROUND.
 HV4207'
 HV4207'TO REACH STATION BY TRUCK, GO TO W END OF THE MEMORIAL BRIDGE
 HV4207'AND TAKE ROAD LEADING N THROUGH THE CCC CAMP, ACROSS THE
 HV4207'BRIDGE TO ROOSEVELT ISLAND AND N ON ISLAND TO END OF ROAD.
 HV4207'THE STATION IS ABOUT 75 YARDS NE OF THE END OF THE ROAD.  A
 HV4207'NEW ROAD IS UNDER CONSTRUCTION ON THE ISLAND WHICH WILL
 HV4207'PROBABLY TAKE ONE NEARER THE POINT.
 HV4207'
 HV4207'HEIGHT OF LIGHT ABOVE STATION MARK - 1.0 METER.
 HV4207
 HV4207                          STATION RECOVERY (1946)
 HV4207
 HV4207'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4207'CAST-IRON PIPE WITH STATION MARK IS WASHED OUT AND IS LYING
 HV4207'ON SHORE.  STATION NOT USABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1233 ***********************************************************************
 HV1233  DESIGNATION -  DEAN DCDHT
 HV1233  PID         -  HV1233
 HV1233  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1233  COUNTRY     -  US
 HV1233  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1233
 HV1233                         *CURRENT SURVEY CONTROL
 HV1233  ______________________________________________________________________
 HV1233* NAD 83(1986) POSITION- 38 54 07.     (N) 076 56 39.     (W)   SCALED
 HV1233* NAVD 88 ORTHO HEIGHT -     8.777 (meters)       28.80  (feet) ADJUSTED
 HV1233  ______________________________________________________________________
 HV1233  GEOID HEIGHT    -        -32.236 (meters)                     GEOID18
 HV1233  DYNAMIC HEIGHT  -          8.772 (meters)       28.78  (feet) COMP
 HV1233  MODELED GRAVITY -    980,092.9   (mgal)                       NAVD 88
 HV1233
 HV1233  VERT ORDER      -  FIRST     CLASS II
 HV1233
 HV1233.The horizontal coordinates were scaled from a map and have
 HV1233.an estimated accuracy of +/- 6 seconds.
 HV1233
 HV1233.The orthometric height was determined by differential leveling and
 HV1233.adjusted by the NATIONAL GEODETIC SURVEY
 HV1233.in June 1991.
 HV1233
 HV1233.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1233.GEOID18 height accuracy estimate available here.
 HV1233
 HV1233.Click photographs - Photos may exist for this station.
 HV1233
 HV1233.The dynamic height is computed by dividing the NAVD 88
 HV1233.geopotential number by the normal gravity value computed on the
 HV1233.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1233.degrees latitude (g = 980.6199 gals.).
 HV1233
 HV1233.The modeled gravity was interpolated from observed gravity values.
 HV1233
 HV1233
 HV1233_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ314076(NAD 83)
 HV1233
 HV1233                          SUPERSEDED SURVEY CONTROL
 HV1233
 HV1233  NGVD 29 (11/26/84)    9.014  (m)           29.57   (f) ADJUSTED    1 2
 HV1233
 HV1233.Superseded values are not recommended for survey control.
 HV1233
 HV1233.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1233.See file dsdata.pdf to determine how the superseded data were derived.
 HV1233
 HV1233_MARKER: Z = SEE DESCRIPTION
 HV1233_SETTING: 45 = UNSPECIFIED DEEP UNSLEEVED SETTING (10 FT.+)
 HV1233_SP_SET: UNSPECIFIED DEEP SET
 HV1233_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1233+STABILITY: SURFACE MOTION
 HV1233
 HV1233  HISTORY     - Date     Condition        Report By
 HV1233  HISTORY     - UNK      MONUMENTED       DCDHT
 HV1233  HISTORY     - 1956     GOOD             CGS
 HV1233
 HV1233                          STATION DESCRIPTION
 HV1233
 HV1233'DESCRIBED BY COAST AND GEODETIC SURVEY 1956
 HV1233'AT WASHINGTON.
 HV1233'AT THE INTERSECTION OF DEAN AND KENILWORTH AVENUES IN NORTHEAST
 HV1233'WASHINGTON, AT THE SOUTH END OF THE OVERPASS ON THE EAST SIDE OF
 HV1233'THE RAMP CARRYING TRAFFIC FROM KENILWORTH AVENUE INTO DEAN
 HV1233'AVENUE, 17.5 FEET EAST OF THE CENTERLINE OF THE RAMP AND 3.5
 HV1233'FEET NORTHEAST OF A TELEPHONE POLE.  A SPECIAL DESTRICT OF
 HV1233'COLUMBIA HIGHWAY DEPARTMENT DEEP MARK LOCATED UNDER A 10 INCH
 HV1233'STEEL COVER.  NOTE-- ACCESS TO THIS MARK IS OBTAINED BY
 HV1233'PREARRANGEMENT WITH ENGINEERS OF THE DISTRICE OF COLUMBIA
 HV1233'HIGHWAY DEPARTMENT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1462 ***********************************************************************
 HV1462  DESIGNATION -  DEEP MARK 1 DCDHT
 HV1462  PID         -  HV1462
 HV1462  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1462  COUNTRY     -  US
 HV1462  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1462
 HV1462                         *CURRENT SURVEY CONTROL
 HV1462  ______________________________________________________________________
 HV1462* NAD 83(1986) POSITION- 38 53 23.     (N) 076 57 33.     (W)   SCALED
 HV1462* NAVD 88 ORTHO HEIGHT -    10.942 (meters)       35.90  (feet) ADJUSTED
 HV1462  ______________________________________________________________________
 HV1462  GEOID HEIGHT    -        -32.223 (meters)                     GEOID18
 HV1462  DYNAMIC HEIGHT  -         10.936 (meters)       35.88  (feet) COMP
 HV1462  MODELED GRAVITY -    980,093.1   (mgal)                       NAVD 88
 HV1462
 HV1462  VERT ORDER      -  SECOND    CLASS 0
 HV1462
 HV1462.The horizontal coordinates were scaled from a map and have
 HV1462.an estimated accuracy of +/- 6 seconds.
 HV1462
 HV1462.The orthometric height was determined by differential leveling and
 HV1462.adjusted by the NATIONAL GEODETIC SURVEY
 HV1462.in June 1991.
 HV1462
 HV1462.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1462.GEOID18 height accuracy estimate available here.
 HV1462
 HV1462.Click photographs - Photos may exist for this station.
 HV1462
 HV1462.The dynamic height is computed by dividing the NAVD 88
 HV1462.geopotential number by the normal gravity value computed on the
 HV1462.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1462.degrees latitude (g = 980.6199 gals.).
 HV1462
 HV1462.The modeled gravity was interpolated from observed gravity values.
 HV1462
 HV1462
 HV1462_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ300063(NAD 83)
 HV1462
 HV1462                          SUPERSEDED SURVEY CONTROL
 HV1462
 HV1462  NGVD 29 (11/26/84)   11.178  (m)           36.67   (f) ADJUSTED    2 0
 HV1462
 HV1462.Superseded values are not recommended for survey control.
 HV1462
 HV1462.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1462.See file dsdata.pdf to determine how the superseded data were derived.
 HV1462
 HV1462_MARKER: Z = SEE DESCRIPTION
 HV1462_SETTING: 45 = UNSPECIFIED DEEP UNSLEEVED SETTING (10 FT.+)
 HV1462_SP_SET: UNSPECIFIED DEEP SET
 HV1462_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1462+STABILITY: SURFACE MOTION
 HV1462
 HV1462  HISTORY     - Date     Condition        Report By
 HV1462  HISTORY     - UNK      MONUMENTED       DCDHT
 HV1462  HISTORY     - 1961     GOOD             CGS
 HV1462
 HV1462                          STATION DESCRIPTION
 HV1462
 HV1462'DESCRIBED BY COAST AND GEODETIC SURVEY 1961
 HV1462'AT WASHINGTON DC.
 HV1462'AT THE EAST CAPITOL ST., KENILWORTH AVE. INTERCHANGE BETWEEN THE
 HV1462'NE ENDS OF TWO BRIDGES OVER EAST CAPITOL ST., 11 FEET N OF THE
 HV1462'N CORNER OF THE NW WALL OF THE LOWER BRIDGE, 12.4 FT. NW OF THE
 HV1462'CURB OF THE LANE CARRYING E BOUND TRAFFIC TO KENILWORTH AVE.  A
 HV1462'DISTRICT OF COLUMBIA DEPT. OF HWYS. SPECIAL DEEP MARK UNDER A
 HV1462'10 IN CIRCULAR METER COVER.  (NOTE-- ACCESS TO THIS MARK IS
 HV1462'OBTAINED BY PREARRANGEMENT WITH ENGINEERS OF THE D.C. DEPT OF
 HV1462'HWYS.).
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1469 ***********************************************************************
 HV1469  DESIGNATION -  DEEP MARK 19
 HV1469  PID         -  HV1469
 HV1469  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1469  COUNTRY     -  US
 HV1469  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1469
 HV1469                         *CURRENT SURVEY CONTROL
 HV1469  ______________________________________________________________________
 HV1469* NAD 83(1986) POSITION- 38 52 41.     (N) 076 58 02.     (W)   SCALED
 HV1469* NAVD 88 ORTHO HEIGHT -     6.440 (meters)       21.13  (feet) ADJUSTED
 HV1469  ______________________________________________________________________
 HV1469  GEOID HEIGHT    -        -32.224 (meters)                     GEOID18
 HV1469  DYNAMIC HEIGHT  -          6.437 (meters)       21.12  (feet) COMP
 HV1469  MODELED GRAVITY -    980,091.7   (mgal)                       NAVD 88
 HV1469
 HV1469  VERT ORDER      -  SECOND    CLASS 0
 HV1469
 HV1469.The horizontal coordinates were scaled from a map and have
 HV1469.an estimated accuracy of +/- 6 seconds.
 HV1469
 HV1469.The orthometric height was determined by differential leveling and
 HV1469.adjusted by the NATIONAL GEODETIC SURVEY
 HV1469.in June 1991.
 HV1469
 HV1469.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1469.GEOID18 height accuracy estimate available here.
 HV1469
 HV1469.Click photographs - Photos may exist for this station.
 HV1469
 HV1469.The dynamic height is computed by dividing the NAVD 88
 HV1469.geopotential number by the normal gravity value computed on the
 HV1469.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1469.degrees latitude (g = 980.6199 gals.).
 HV1469
 HV1469.The modeled gravity was interpolated from observed gravity values.
 HV1469
 HV1469
 HV1469_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ293050(NAD 83)
 HV1469
 HV1469                          SUPERSEDED SURVEY CONTROL
 HV1469
 HV1469  NGVD 29 (11/26/84)    6.679  (m)           21.91   (f) ADJUSTED    2 0
 HV1469
 HV1469.Superseded values are not recommended for survey control.
 HV1469
 HV1469.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1469.See file dsdata.pdf to determine how the superseded data were derived.
 HV1469
 HV1469_MARKER: Z = SEE DESCRIPTION
 HV1469_SETTING: 45 = UNSPECIFIED DEEP UNSLEEVED SETTING (10 FT.+)
 HV1469_SP_SET: UNSPECIFIED DEEP SET
 HV1469_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1469+STABILITY: SURFACE MOTION
 HV1469
 HV1469  HISTORY     - Date     Condition        Report By
 HV1469  HISTORY     - UNK      MONUMENTED       DCDHT
 HV1469  HISTORY     - 1961     GOOD             CGS
 HV1469
 HV1469                          STATION DESCRIPTION
 HV1469
 HV1469'DESCRIBED BY COAST AND GEODETIC SURVEY 1961
 HV1469'IN WASHINGTON DC.
 HV1469'IN SE WASHINGTON, IN ANACOSTIA PARK, ABOUT 0.2 MI. SOUTHWEST OF
 HV1469'THE SOUTHWEST END OF BRIDGE 505 OVER THE P.R.R. FREIGHT YARD,
 HV1469'ABOUT 70 FT NORTHWEST OF THE NW EDGE OF ANACOSTIA FREEWAY, 60
 HV1469'FEET SOUTH OF THE MOST SOUTHERN OF A CLUMP OF THREE LARGE MAPLE
 HV1469'TREES, AND 102 FEET NE OF THE CENTER OF A MANHOLE COVER.  A DIST.
 HV1469'OF COLUMBIA DEPT. OF HIGHWAYS SPECIAL DEEP MARK UNDER A 10 IN
 HV1469'CIRCULAR METER COVER.  (NOTE-- ACCESS TO THIS MARK IS OBTAINED
 HV1469'BY PREARRANGEMENT WITH ENGINEERS OF THE D.C. DEPT. OF HWYS.).
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1464 ***********************************************************************
 HV1464  DESIGNATION -  DEEP MARK 2 DCDHT
 HV1464  PID         -  HV1464
 HV1464  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1464  COUNTRY     -  US
 HV1464  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1464
 HV1464                         *CURRENT SURVEY CONTROL
 HV1464  ______________________________________________________________________
 HV1464* NAD 83(1986) POSITION- 38 53 16.     (N) 076 57 42.     (W)   SCALED
 HV1464* NAVD 88 ORTHO HEIGHT -     9.350 (meters)       30.68  (feet) ADJUSTED
 HV1464  ______________________________________________________________________
 HV1464  GEOID HEIGHT    -        -32.221 (meters)                     GEOID18
 HV1464  DYNAMIC HEIGHT  -          9.345 (meters)       30.66  (feet) COMP
 HV1464  MODELED GRAVITY -    980,093.2   (mgal)                       NAVD 88
 HV1464
 HV1464  VERT ORDER      -  SECOND    CLASS 0
 HV1464
 HV1464.The horizontal coordinates were scaled from a map and have
 HV1464.an estimated accuracy of +/- 6 seconds.
 HV1464
 HV1464.The orthometric height was determined by differential leveling and
 HV1464.adjusted by the NATIONAL GEODETIC SURVEY
 HV1464.in June 1991.
 HV1464
 HV1464.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1464.GEOID18 height accuracy estimate available here.
 HV1464
 HV1464.Click photographs - Photos may exist for this station.
 HV1464
 HV1464.The dynamic height is computed by dividing the NAVD 88
 HV1464.geopotential number by the normal gravity value computed on the
 HV1464.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1464.degrees latitude (g = 980.6199 gals.).
 HV1464
 HV1464.The modeled gravity was interpolated from observed gravity values.
 HV1464
 HV1464
 HV1464_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ298061(NAD 83)
 HV1464
 HV1464                          SUPERSEDED SURVEY CONTROL
 HV1464
 HV1464  NGVD 29 (11/26/84)    9.587  (m)           31.45   (f) ADJUSTED    2 0
 HV1464
 HV1464.Superseded values are not recommended for survey control.
 HV1464
 HV1464.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1464.See file dsdata.pdf to determine how the superseded data were derived.
 HV1464
 HV1464_MARKER: Z = SEE DESCRIPTION
 HV1464_SETTING: 45 = UNSPECIFIED DEEP UNSLEEVED SETTING (10 FT.+)
 HV1464_SP_SET: UNSPECIFIED DEEP SET
 HV1464_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1464+STABILITY: SURFACE MOTION
 HV1464
 HV1464  HISTORY     - Date     Condition        Report By
 HV1464  HISTORY     - UNK      MONUMENTED       DCDHT
 HV1464  HISTORY     - 1961     GOOD             CGS
 HV1464
 HV1464                          STATION DESCRIPTION
 HV1464
 HV1464'DESCRIBED BY COAST AND GEODETIC SURVEY 1961
 HV1464'IN WASHINGTON.
 HV1464'IN SE WASHINGTON, IN ANACOSTIA PARK, ABOUT 0.1 MI. NE OF THE NE
 HV1464'END OF BRIDGE 505 OVER THE P.R.R. FREIGHT YARDS, ABOUT 50 YARDS
 HV1464'E OF THE SE EDGE OF THE ANACOSTIA FREEWAY, 55 FEET NW OF THE NW
 HV1464'TRACK, 18 FEET NE OF A 5 IN LOCUST TREE.  A DISTRICT OF COLUMBIA
 HV1464'DEPT. OF HWYS. SPECIAL DEEP MARK UNDER A 10 INCH CIRCULAR METER
 HV1464'COVER.  (NOTE-- ACCESS TO THIS MARK IS OBTAINED BY PREARRANGEMENT
 HV1464'WITH ENGINEERS OF THE D.C. DEPT. OF HWYS.).
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1470 ***********************************************************************
 HV1470  DESIGNATION -  DEEP MARK 3
 HV1470  PID         -  HV1470
 HV1470  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1470  COUNTRY     -  US
 HV1470  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1470
 HV1470                         *CURRENT SURVEY CONTROL
 HV1470  ______________________________________________________________________
 HV1470* NAD 83(1986) POSITION- 38 52 30.     (N) 076 58 16.     (W)   SCALED
 HV1470* NAVD 88 ORTHO HEIGHT -     6.180 (meters)       20.28  (feet) ADJUSTED
 HV1470  ______________________________________________________________________
 HV1470  GEOID HEIGHT    -        -32.221 (meters)                     GEOID18
 HV1470  DYNAMIC HEIGHT  -          6.177 (meters)       20.27  (feet) COMP
 HV1470  MODELED GRAVITY -    980,091.8   (mgal)                       NAVD 88
 HV1470
 HV1470  VERT ORDER      -  SECOND    CLASS 0
 HV1470
 HV1470.The horizontal coordinates were scaled from a map and have
 HV1470.an estimated accuracy of +/- 6 seconds.
 HV1470
 HV1470.The orthometric height was determined by differential leveling and
 HV1470.adjusted by the NATIONAL GEODETIC SURVEY
 HV1470.in June 1991.
 HV1470
 HV1470.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1470.GEOID18 height accuracy estimate available here.
 HV1470
 HV1470.Click photographs - Photos may exist for this station.
 HV1470
 HV1470.The dynamic height is computed by dividing the NAVD 88
 HV1470.geopotential number by the normal gravity value computed on the
 HV1470.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1470.degrees latitude (g = 980.6199 gals.).
 HV1470
 HV1470.The modeled gravity was interpolated from observed gravity values.
 HV1470
 HV1470
 HV1470_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ290047(NAD 83)
 HV1470
 HV1470                          SUPERSEDED SURVEY CONTROL
 HV1470
 HV1470  NGVD 29 (11/26/84)    6.420  (m)           21.06   (f) ADJUSTED    2 0
 HV1470
 HV1470.Superseded values are not recommended for survey control.
 HV1470
 HV1470.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1470.See file dsdata.pdf to determine how the superseded data were derived.
 HV1470
 HV1470_MARKER: Z = SEE DESCRIPTION
 HV1470_SETTING: 45 = UNSPECIFIED DEEP UNSLEEVED SETTING (10 FT.+)
 HV1470_SP_SET: UNSPECIFIED DEEP SET
 HV1470_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1470+STABILITY: SURFACE MOTION
 HV1470
 HV1470  HISTORY     - Date     Condition        Report By
 HV1470  HISTORY     - UNK      MONUMENTED       DCDHT
 HV1470  HISTORY     - 1961     GOOD             CGS
 HV1470
 HV1470                          STATION DESCRIPTION
 HV1470
 HV1470'DESCRIBED BY COAST AND GEODETIC SURVEY 1961
 HV1470'IN WASHINGTON.
 HV1470'IN SE WASHINGTON, IN ANACOSTIA PARK, ABOUT 0.3 MI. SE OF THE
 HV1470'SE END OF JOHN PHILIP SOUSA MEMORIAL BRIDGE, N ACROSS THE P.R.R.
 HV1470'TRACK FROM 2501 FAIRLAWN AVENUE, 19 YARDS W OF THE W SIDE OF THE
 HV1470'HOUSE PROJECTED, 42 FEET N OF THE N RAIL OF THE TRACK, 50 FEET
 HV1470'S OF THE E END OF A 40 INCH CULVERT HEADWALL,  (THE CULVERT IS
 HV1470'UNDER THE ANOCOSTIA FREEWAY).  A DIST. OF COLUMBIA DEPT. OF
 HV1470'HWYS. SPECIAL DEEP MARK UNDER A 10 INCH CIRCULAR METER COVER.
 HV1470'(NOTE-- ACCESS TO THIS MARK IS OBTAINED BY PREARRANGEMENT WITH
 HV1470'ENGINEERS OF THE D.C. DEPT. OF HWYS.).
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1468 ***********************************************************************
 HV1468  DESIGNATION -  DEEP MARK 505 DCDHT
 HV1468  PID         -  HV1468
 HV1468  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1468  COUNTRY     -  US
 HV1468  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1468
 HV1468                         *CURRENT SURVEY CONTROL
 HV1468  ______________________________________________________________________
 HV1468* NAD 83(1986) POSITION- 38 52 54.     (N) 076 57 52.     (W)   SCALED
 HV1468* NAVD 88 ORTHO HEIGHT -     5.355 (meters)       17.57  (feet) ADJUSTED
 HV1468  ______________________________________________________________________
 HV1468  GEOID HEIGHT    -        -32.224 (meters)                     GEOID18
 HV1468  DYNAMIC HEIGHT  -          5.352 (meters)       17.56  (feet) COMP
 HV1468  MODELED GRAVITY -    980,092.0   (mgal)                       NAVD 88
 HV1468
 HV1468  VERT ORDER      -  SECOND    CLASS 0
 HV1468
 HV1468.The horizontal coordinates were scaled from a map and have
 HV1468.an estimated accuracy of +/- 6 seconds.
 HV1468
 HV1468.The orthometric height was determined by differential leveling and
 HV1468.adjusted by the NATIONAL GEODETIC SURVEY
 HV1468.in June 1991.
 HV1468
 HV1468.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1468.GEOID18 height accuracy estimate available here.
 HV1468
 HV1468.Click photographs - Photos may exist for this station.
 HV1468
 HV1468.The dynamic height is computed by dividing the NAVD 88
 HV1468.geopotential number by the normal gravity value computed on the
 HV1468.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1468.degrees latitude (g = 980.6199 gals.).
 HV1468
 HV1468.The modeled gravity was interpolated from observed gravity values.
 HV1468
 HV1468
 HV1468_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ296054(NAD 83)
 HV1468
 HV1468                          SUPERSEDED SURVEY CONTROL
 HV1468
 HV1468  NGVD 29 (11/26/84)    5.593  (m)           18.35   (f) ADJUSTED    2 0
 HV1468
 HV1468.Superseded values are not recommended for survey control.
 HV1468
 HV1468.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1468.See file dsdata.pdf to determine how the superseded data were derived.
 HV1468
 HV1468_MARKER: Z = SEE DESCRIPTION
 HV1468_SETTING: 45 = UNSPECIFIED DEEP UNSLEEVED SETTING (10 FT.+)
 HV1468_SP_SET: UNSPECIFIED DEEP SET
 HV1468_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1468+STABILITY: SURFACE MOTION
 HV1468
 HV1468  HISTORY     - Date     Condition        Report By
 HV1468  HISTORY     - UNK      MONUMENTED       DCDHT
 HV1468  HISTORY     - 1961     GOOD             CGS
 HV1468
 HV1468                          STATION DESCRIPTION
 HV1468
 HV1468'DESCRIBED BY COAST AND GEODETIC SURVEY 1961
 HV1468'IN WASHINGTON.
 HV1468'IN SE WASHINGTON, D.C., IN ANACOSTIA PARK, NEAR THE SW END OF
 HV1468'BRIDGE 505 WHICH CARRIES THE ANACOISTIA FREEWAY OVER THE P.R.R.
 HV1468'FREIGHT YARDS, 19 1/2 FEET N OF THE NW END OF THE FIRST PIER NE
 HV1468'OF THE SW END OF THE BRIDGE, AND 1 1/2 FEET NW OF A VERTICAL
 HV1468'RAIL SECTION PROJECTING ABOUT 4 1/2 FEET AND PAINTED ORANGE.
 HV1468'A DISTRICT OF COLUMBIA DEPT. OF HWYS. SPECIAL DEEP MARK UNDER
 HV1468'A 10 IN CIRCULAR METER COVER.  (NOTE-- ACCESS TO THIS MARK IS
 HV1468'OBTAINED BY PREARRANGEMENT WITH ENGINEERS OF THE D.C. DEPT. OF HWYS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9830 ***********************************************************************
 HV9830  DESIGNATION -  DICKSON GPS E 14I
 HV9830  PID         -  HV9830
 HV9830  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9830  COUNTRY     -  US
 HV9830  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9830
 HV9830                         *CURRENT SURVEY CONTROL
 HV9830  ______________________________________________________________________
 HV9830* NAD 83(2011) POSITION- 38 56 36.77159(N) 077 01 08.34929(W)   ADJUSTED
 HV9830* NAD 83(2011) ELLIP HT-    42.624 (meters)        (06/27/12)   ADJUSTED
 HV9830* NAD 83(2011) EPOCH   -  2010.00
 HV9830* NAVD 88 ORTHO HEIGHT -    74.7   (meters)      245.    (feet) VERTCON3
 HV9830  ______________________________________________________________________
 HV9830  GEOID HEIGHT    -        -32.019 (meters)                     GEOID18
 HV9830  NAD 83(2011) X  -  1,115,795.966 (meters)                     COMP
 HV9830  NAD 83(2011) Y  - -4,840,360.447 (meters)                     COMP
 HV9830  NAD 83(2011) Z  -  3,987,471.457 (meters)                     COMP
 HV9830  LAPLACE CORR    -         -2.23  (seconds)                    DEFLEC18
 HV9830
 HV9830  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV9830  Standards:
 HV9830         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV9830            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV9830  -------------------------------------------------------------------
 HV9830  NETWORK    0.97   1.78           0.43   0.36   0.91      0.05191058
 HV9830  -------------------------------------------------------------------
 HV9830  Click here for local accuracies and other accuracy information.
 HV9830
 HV9830.The horizontal coordinates were established by GPS observations
 HV9830.and adjusted by the National Geodetic Survey in June 2012.
 HV9830
 HV9830.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV9830.been affixed to the stable North American tectonic plate. See 
 HV9830.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV9830
 HV9830.The horizontal coordinates are valid at the epoch date displayed above
 HV9830.which is a decimal equivalence of Year/Month/Day.
 HV9830
 HV9830.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV9830.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV9830
 HV9830.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9830.GEOID18 height accuracy estimate available here.
 HV9830
 HV9830.Click photographs - Photos may exist for this station.
 HV9830
 HV9830.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV9830
 HV9830.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9830
 HV9830.The ellipsoidal height was determined by GPS observations
 HV9830.and is referenced to NAD 83.
 HV9830
 HV9830. The following values were computed from the NAD 83(2011) position.
 HV9830
 HV9830;                    North         East     Units Scale Factor Converg.
 HV9830;SPC MD       -   141,739.632   398,354.094   MT  0.99995054   -0 00 42.9
 HV9830;SPC MD       -   465,024.11  1,306,933.39   sFT  0.99995054   -0 00 42.9
 HV9830;SPC VA N     - 2,142,770.000 3,628,386.686   MT  0.99996454   +0 55 27.6
 HV9830;SPC VA N     - 7,030,071.24 11,904,131.99   sFT  0.99996454   +0 55 27.6
 HV9830;UTM  18      - 4,312,450.231   325,025.950   MT  0.99997700   -1 16 09.7
 HV9830
 HV9830!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9830!SPC MD       -   0.99999331  x   0.99995054  =   0.99994385
 HV9830!SPC VA N     -   0.99999331  x   0.99996454  =   0.99995785
 HV9830!UTM  18      -   0.99999331  x   0.99997700  =   0.99997031
 HV9830
 HV9830_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2502512450(NAD 83)
 HV9830
 HV9830|---------------------------------------------------------------------|
 HV9830| PID    Reference Object                     Distance      Geod. Az  |
 HV9830|                                                           dddmmss.s |
 HV9830| HV9834 STEINKOLK GPS E14H                  343.165 METERS 20933     |
 HV9830|---------------------------------------------------------------------|
 HV9830
 HV9830                          SUPERSEDED SURVEY CONTROL
 HV9830
 HV9830  NAD 83(2007)-  38 56 36.77221(N)    077 01 08.35011(W) AD(2002.00) 0
 HV9830  ELLIP H (02/10/07)   42.636  (m)                       GP(2002.00)    
 HV9830  ELLIP H (08/30/02)   42.631  (m)                       GP(       ) 4 2
 HV9830  NAD 83(1993)-  38 56 36.77269(N)    077 01 08.34984(W) AD(       ) 1
 HV9830  ELLIP H (11/14/94)   42.623  (m)                       GP(       ) 4 2
 HV9830  NAD 83(1991)-  38 56 36.77210(N)    077 01 08.34984(W) AD(       ) 1
 HV9830  NGVD 29 (11/30/93)   74.9    (m)  GEOID93  model used  GPS OBS        
 HV9830
 HV9830.Superseded values are not recommended for survey control.
 HV9830
 HV9830.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9830.See file dsdata.pdf to determine how the superseded data were derived.
 HV9830
 HV9830_MARKER: DD = SURVEY DISK
 HV9830_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV9830_SP_SET: FLUSH IN SIDEWALK
 HV9830_STAMPING: DICKSON GPS 9-92
 HV9830_MARK LOGO: DEWDAV
 HV9830_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9830_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9830_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV9830+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9830
 HV9830  HISTORY     - Date     Condition        Report By
 HV9830  HISTORY     - 1992     MONUMENTED       DEWDAV
 HV9830
 HV9830                          STATION DESCRIPTION
 HV9830
 HV9830'DESCRIBED BY DEWBERRY DAVIS 1992
 HV9830'STATION IS LOCATED IN DOWNTOWN WASHINGTON, DISTRICT OF COLUMBIA.
 HV9830'TO REACH STATION PROCEED TO GRANT CIRCLE NORTHWEST AT INTERSECTION OF
 HV9830'NEW HAMPSHIRE AVENUE AND VARNUM STREET AND 5TH STREET NORTHWEST.
 HV9830'STATION IS WITHIN CIRCLE AND IS STANDARD 2.5 INCH DIAMETER BRASS
 HV9830'METRO SURVEY DISK SET FLUSH IN CONCRETE SIDEWALK ON NORTH SIDE OF
 HV9830'INNER AREA OF TRAFFIC CIRCLE.
 HV9830'STATION IS BEARING SOUTH 29-55-16 WEST 113.641 FT (34.638 M) FROM
 HV9830'METRO CONTROL POINT E-14I, BEARING SOUTH 32-53-59 WEST 935.433 FT
 HV9830'(285.121 M) FROM METRO CONTROL POINT E-14JR, NORTH 29-33-33 EAST FROM
 HV9830'METRO CONTROL STATION STEINKOLK GPS E-14H, 285.120 FT (86.905 M)
 HV9830'SOUTH FROM REFERENCE DISK C, 594.549 FT (181.219 M) SOUTHEAST FROM
 HV9830'REFERENCE DISK B AND 197.865 FT (60.309 M) NORTHWEST FROM REFERENCE
 HV9830'DISK A.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI7408 ***********************************************************************
 AI7408  DESIGNATION -  DMA 32017
 AI7408  PID         -  AI7408
 AI7408  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI7408  COUNTRY     -  US
 AI7408  USGS QUAD   -  WASHINGTON WEST (2016)
 AI7408
 AI7408                         *CURRENT SURVEY CONTROL
 AI7408  ______________________________________________________________________
 AI7408* NAD 83(1991) POSITION- 38 55 13.25205(N) 077 03 58.75308(W)   ADJUSTED
 AI7408* NAVD 88 ORTHO HEIGHT -    86.56  (meters)      284.0   (feet) LEVELING
 AI7408  ______________________________________________________________________
 AI7408  GEOID HEIGHT    -        -31.992 (meters)                     GEOID18
 AI7408  LAPLACE CORR    -         -2.96  (seconds)                    DEFLEC18
 AI7408  HORZ ORDER      -  FIRST
 AI7408  VERT ORDER      -  THIRD ?
 AI7408
 AI7408.The horizontal coordinates were established by classical geodetic methods
 AI7408.and adjusted by the National Geodetic Survey in August 2000.
 AI7408
 AI7408.The orthometric height was determined by differential leveling.
 AI7408.The vertical network tie was performed by a horz. field party for horz.
 AI7408.obs reductions. Reset procedures were used to establish the elevation.
 AI7408
 AI7408.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI7408.GEOID18 height accuracy estimate available here.
 AI7408
 AI7408.Click photographs - Photos may exist for this station.
 AI7408
 AI7408.The Laplace correction was computed from DEFLEC18 derived deflections.
 AI7408
 AI7408. The following values were computed from the NAD 83(1991) position.
 AI7408
 AI7408;                    North         East     Units Scale Factor Converg.
 AI7408;UTM  18      - 4,309,967.363   320,864.996   MT  0.99999515   -1 17 54.6
 AI7408
 AI7408!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AI7408!UTM  18      -   0.99999144  x   0.99999515  =   0.99998659
 AI7408
 AI7408_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2086409967(NAD 83)
 AI7408
 AI7408                          SUPERSEDED SURVEY CONTROL
 AI7408
 AI7408.No superseded survey control is available for this station.
 AI7408
 AI7408_MARKER: DD = SURVEY DISK
 AI7408_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 AI7408_SP_SET: BUILDING
 AI7408_STAMPING: 32017 DMAHTC GS SS 1987
 AI7408_MARK LOGO: USACE
 AI7408_MAGNETIC: N = NO MAGNETIC MATERIAL
 AI7408_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 AI7408
 AI7408  HISTORY     - Date     Condition        Report By
 AI7408  HISTORY     - 1987     MONUMENTED       DMA
 AI7408  HISTORY     - 20000125 GOOD             NGS
 AI7408
 AI7408                          STATION DESCRIPTION
 AI7408
 AI7408'DESCRIBED BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 AI7408'2.75 MILES (4.43 KM) SOUTHEAST ALONG MASSACHUSETTS AVENUE FROM THE
 AI7408'INTERSECTION WITH WESTERN AVENUE AT WESTMORELAND CIRCLE AT THE
 AI7408'MARYLAND AND DISTRICT OF COLUMBIA STATE LINE TO THE INTERSECTION OF
 AI7408'OBSERVATORY CIRCLE NORTHWEST, THENCE 0.2 MILE (0.3 KM) NORTHWEST ALONG
 AI7408'OBSERVATORY CIRCLE NORTHWEST TO THE GUARD HOUSE, THENCE 0.5 MILE (0.8
 AI7408'KM) NORTH ALONG A PAVED ROAD TO THE TOP OF INCLINE TO THE SECOND
 AI7408'SIDEWALK LEADING TO THE ENTRANCE OF BUILDING NUMBER 52, CONTINUE 0.1
 AI7408'MILE (0.2 KM) IN NORTHERLY DIRECTION FOLLOWING THE ROAD PASSING
 AI7408'BUILDING NUMBER 59 ON LEFT TO A T INTERSECTION.  THENCE 0.05 MILE
 AI7408'(0.08 KM) EAST ALONG PAVED ROAD TO BUILDING NUMBER 78 (SIMON NEWCOMB
 AI7408'LABORATORY) ON EAST SIDE OF BUILDING ON THE ROOF, 30.0 FEET (9.1 M)
 AI7408'WEST OF BM 85407 RM 1, 4.0 FEET (1.2 M) EAST OF WEST EDGE OF ROOF
 AI7408'EDGE, 7.8 FEET (2.4 M) NORTH OF SOUTH EDGE OF ROOF EDGE, 33.1 FEET
 AI7408'(10.1 M) WEST OF EAST EDGE OF ROOF EDGE, IN THE SOUTHWEST CORNER OF
 AI7408'BUILDING.  NOTE--DISK HAS PHILLIP HEAD SCREW IN CENTER. NOTE--CONTACT
 AI7408'HEAD OF EARTH ORIENTATION DEPT. (JIM RAY) AT 202-762-1444 BEFORE
 AI7408'ENTERING OBSERVATORY GROUNDS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI7406 ***********************************************************************
 AI7406  DESIGNATION -  DMA 85407 GPS ANTENNA
 AI7406  PID         -  AI7406
 AI7406  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI7406  COUNTRY     -  US
 AI7406  USGS QUAD   -  WASHINGTON WEST (2016)
 AI7406
 AI7406                         *CURRENT SURVEY CONTROL
 AI7406  ______________________________________________________________________
 AI7406* NAD 83(1991) POSITION- 38 55 13.59278(N) 077 03 58.39876(W)   ADJUSTED
 AI7406* NAVD 88 ORTHO HEIGHT -    92.27  (meters)      302.7   (feet) LEVELING
 AI7406  ______________________________________________________________________
 AI7406  GEOID HEIGHT    -        -31.992 (meters)                     GEOID18
 AI7406  LAPLACE CORR    -         -2.96  (seconds)                    DEFLEC18
 AI7406  HORZ ORDER      -  SECOND
 AI7406  VERT ORDER      -  THIRD ?
 AI7406
 AI7406.The horizontal coordinates were established by classical geodetic methods
 AI7406.and adjusted by the National Geodetic Survey in August 2000.
 AI7406
 AI7406.The orthometric height was determined by differential leveling.
 AI7406.The vertical network tie was performed by a horz. field party for horz.
 AI7406.obs reductions. Reset procedures were used to establish the elevation.
 AI7406
 AI7406.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI7406.GEOID18 height accuracy estimate available here.
 AI7406
 AI7406.Click photographs - Photos may exist for this station.
 AI7406
 AI7406.The Laplace correction was computed from DEFLEC18 derived deflections.
 AI7406
 AI7406. The following values were computed from the NAD 83(1991) position.
 AI7406
 AI7406;                    North         East     Units Scale Factor Converg.
 AI7406;UTM  18      - 4,309,977.674   320,873.768   MT  0.99999511   -1 17 54.3
 AI7406
 AI7406!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AI7406!UTM  18      -   0.99999054  x   0.99999511  =   0.99998565
 AI7406
 AI7406_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2087309977(NAD 83)
 AI7406
 AI7406                          SUPERSEDED SURVEY CONTROL
 AI7406
 AI7406.No superseded survey control is available for this station.
 AI7406
 AI7406_MARKER: DD = SURVEY DISK
 AI7406_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 AI7406_SP_SET: BUILDING
 AI7406_STAMPING: 85407 GGB 1995
 AI7406_MARK LOGO: USACE
 AI7406_MAGNETIC: N = NO MAGNETIC MATERIAL
 AI7406_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 AI7406
 AI7406  HISTORY     - Date     Condition        Report By
 AI7406  HISTORY     - 1995     MONUMENTED       DMA
 AI7406  HISTORY     - 20000125 GOOD             NGS
 AI7406
 AI7406                          STATION DESCRIPTION
 AI7406
 AI7406'DESCRIBED BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 AI7406'2.75 MILES (4.43 KM) SOUTHEAST ALONG MASSACHUSETTS AVENUE FROM THE
 AI7406'INTERSECTION WITH WESTERN AVENUE AT WESTMORELAND CIRCLE AT THE
 AI7406'MARYLAND AND DISTRICT OF COLUMBIA STATE LINE TO THE INTERSECTION OF
 AI7406'OBSERVATORY CIRCLE NW, THENCE 0.2 MILE (0.3 KM) NORTHWEST ALONG
 AI7406'OBSERVATORY CIRCLE NORTHWEST TO THE GUARD HOUSE, THENCE 0.5 MILE (0.8
 AI7406'KM) NORTH ALONG A PAVED ROAD TO THE TOP OF INCLINE TO THE SECOND
 AI7406'SIDEWALK LEADING TO THE ENTRANCE OF BUILDING NUMBER 52, CONTINUE 0.1
 AI7406'MILE (0.2 KM) IN NORTHERLY DIRECTION FOLLOWING THE ROAD PASSING
 AI7406'BUILDING NUMBER 59 ON LEFT TO A T INTERSECTIO.  THENCE 0.05 MILE (0.08
 AI7406'KM) EAST ALONG PAVED ROAD TO BUILDING NUMBER 78 (SIMON NEWCOMB
 AI7406'LABORATORY) ON EAST SIDE OF BUILDING ON THE ROOF, 5.6 FEET (1.7 M)
 AI7406'WEST OF EAST EDGE OF ROOF, 11.3 FEET (3.4 M) SOUTHEAST OF THE OUTSIDE
 AI7406'CENTER OF A LARGE DOME, 46.0 FEET (14.0 M) SOUTH OF THE NORTH EDGE OF
 AI7406'ROOF.  A STEEL PIPE ATTACHED TO THE BUILDING FRAME EPOXIED TO THE
 AI7406'SQUARE STEEL PLATE ON PIPE. NOTE--CONTACT HEAD OF EARTH ORIENTATION
 AI7406'DEPT. (JIM RAY) AT 202-762-1444 BEFORE ENTERING OBSERVATORY GROUNDS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI7407 ***********************************************************************
 AI7407  DESIGNATION -  DMA 85407 RM 1
 AI7407  PID         -  AI7407
 AI7407  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI7407  COUNTRY     -  US
 AI7407  USGS QUAD   -  WASHINGTON WEST (2016)
 AI7407
 AI7407                         *CURRENT SURVEY CONTROL
 AI7407  ______________________________________________________________________
 AI7407* NAD 83(1991) POSITION- 38 55 13.59307(N) 077 03 58.39915(W)   ADJUSTED
 AI7407* NAVD 88 ORTHO HEIGHT -    86.77  (meters)      284.7   (feet) LEVELING
 AI7407  ______________________________________________________________________
 AI7407  GEOID HEIGHT    -        -31.992 (meters)                     GEOID18
 AI7407  LAPLACE CORR    -         -2.96  (seconds)                    DEFLEC18
 AI7407  HORZ ORDER      -  FIRST
 AI7407  VERT ORDER      -  THIRD ?
 AI7407
 AI7407.The horizontal coordinates were established by classical geodetic methods
 AI7407.and adjusted by the National Geodetic Survey in August 2000.
 AI7407
 AI7407.The orthometric height was determined by differential leveling.
 AI7407.The vertical network tie was performed by a horz. field party for horz.
 AI7407.obs reductions. Reset procedures were used to establish the elevation.
 AI7407
 AI7407.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI7407.GEOID18 height accuracy estimate available here.
 AI7407
 AI7407.Click photographs - Photos may exist for this station.
 AI7407
 AI7407.The Laplace correction was computed from DEFLEC18 derived deflections.
 AI7407
 AI7407. The following values were computed from the NAD 83(1991) position.
 AI7407
 AI7407;                    North         East     Units Scale Factor Converg.
 AI7407;UTM  18      - 4,309,977.683   320,873.759   MT  0.99999511   -1 17 54.3
 AI7407
 AI7407!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AI7407!UTM  18      -   0.99999141  x   0.99999511  =   0.99998652
 AI7407
 AI7407_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2087309977(NAD 83)
 AI7407
 AI7407                          SUPERSEDED SURVEY CONTROL
 AI7407
 AI7407.No superseded survey control is available for this station.
 AI7407
 AI7407_MARKER: DD = SURVEY DISK
 AI7407_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 AI7407_SP_SET: BUILDING
 AI7407_STAMPING: 85407 RM 1 GGB 1995
 AI7407_MARK LOGO: USACE
 AI7407_MAGNETIC: N = NO MAGNETIC MATERIAL
 AI7407_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 AI7407
 AI7407  HISTORY     - Date     Condition        Report By
 AI7407  HISTORY     - 1995     MONUMENTED       DMA
 AI7407  HISTORY     - 20000125 GOOD             NGS
 AI7407
 AI7407                          STATION DESCRIPTION
 AI7407
 AI7407'DESCRIBED BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 AI7407'2.75 MILES (4.43 KM) SOUTHEAST ALONG MASSACHUSETTS AVENUE FROM THE
 AI7407'INTERSECTION WITH WESTERN AVENUE AT WESTMORELAND CIRCLE AT THE
 AI7407'MARYLAND AND DISTRICT OF COLUMBIA STATE LINE TO THE INTERSECTION OF
 AI7407'OBSERVATORY CIRCLE NW, THENCE 0.2 MILE (0.3 KM) NORTHWE4ST ALONG
 AI7407'OBSERVATORY CIRCLE NORTHWEST TO THE GUARD HOUSE, THENCE 0.5 MLE NORTH
 AI7407'ALONG A PAVED ROAD TO THE TOP OF INCLINE TO THE SECOND SIDEWALK
 AI7407'LEADING TO THE ENTRANCE OF BUILDING NUMBER 52, CONTONUE 0.1 MILE (0.2
 AI7407'KM) IN NORTHERLY DIRECTION FOLLOWING THE ROAD PASSING BUILDING NUMBER
 AI7407'59 ON LEFT TO A T INTERSECTION.  THENCE 0.05 MILE (0.08 KM) EAST ALONG
 AI7407'PAVED ROAD TO BUILDING NUMBER 78 (SIMON NEWCOMB LABORATORY) ON EAST
 AI7407'SIDE OF BUILDING ON THE ROOF.  3.2 FEET (1.0 M) WEST OF EAST EDGE OF
 AI7407'ROOF, 7.8 FEET (2.4 M) NORTH OF SOUTH EDGE OF ROOF, 30.0 FEET (9.1 M)
 AI7407'EAST OF BM 32017 IN THE SOUTHEAST CORNER OF BUILDING. NOTE--CONTACT
 AI7407'HEAD OF EARTH ORIENTATION DEPT. (JIM RAY) AT 202-762-1444 BEFORE
 AI7407'ENTERING OBSERVATORY GROUNDS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI7411 ***********************************************************************
 AI7411  DESIGNATION -  DMA US NAVAL OBSERVATORY A
 AI7411  PID         -  AI7411
 AI7411  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI7411  COUNTRY     -  US
 AI7411  USGS QUAD   -  WASHINGTON WEST (2016)
 AI7411
 AI7411                         *CURRENT SURVEY CONTROL
 AI7411  ______________________________________________________________________
 AI7411* NAD 83(2011) POSITION- 38 55 12.88663(N) 077 03 54.91061(W)   ADJUSTED
 AI7411* NAD 83(2011) ELLIP HT-    44.363 (meters)        (06/27/12)   ADJUSTED
 AI7411* NAD 83(2011) EPOCH   -  2010.00
 AI7411* NAVD 88 ORTHO HEIGHT -    76.35  (meters)      250.5   (feet) LEVELING
 AI7411  ______________________________________________________________________
 AI7411  GEOID HEIGHT    -        -31.993 (meters)                     GEOID18
 AI7411  NAD 83(2011) X  -  1,112,251.118 (meters)                     COMP
 AI7411  NAD 83(2011) Y  - -4,842,845.495 (meters)                     COMP
 AI7411  NAD 83(2011) Z  -  3,985,460.294 (meters)                     COMP
 AI7411  LAPLACE CORR    -         -2.95  (seconds)                    DEFLEC18
 AI7411  VERT ORDER      -  THIRD ?
 AI7411
 AI7411  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AI7411  Standards:
 AI7411         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AI7411            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AI7411  -------------------------------------------------------------------
 AI7411  NETWORK    0.93   0.96           0.43   0.31   0.49     -0.12411627
 AI7411  -------------------------------------------------------------------
 AI7411  Click here for local accuracies and other accuracy information.
 AI7411
 AI7411.The horizontal coordinates were established by GPS observations
 AI7411.and adjusted by the National Geodetic Survey in June 2012.
 AI7411
 AI7411.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AI7411.been affixed to the stable North American tectonic plate. See 
 AI7411.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AI7411
 AI7411.The horizontal coordinates are valid at the epoch date displayed above
 AI7411.which is a decimal equivalence of Year/Month/Day.
 AI7411
 AI7411.The orthometric height was determined by differential leveling.
 AI7411.The vertical network tie was performed by a horz. field party for horz.
 AI7411.obs reductions. Reset procedures were used to establish the elevation.
 AI7411
 AI7411.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI7411.GEOID18 height accuracy estimate available here.
 AI7411
 AI7411.Click photographs - Photos may exist for this station.
 AI7411
 AI7411.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AI7411
 AI7411.The Laplace correction was computed from DEFLEC18 derived deflections.
 AI7411
 AI7411.The ellipsoidal height was determined by GPS observations
 AI7411.and is referenced to NAD 83.
 AI7411
 AI7411. The following values were computed from the NAD 83(2011) position.
 AI7411
 AI7411;                    North         East     Units Scale Factor Converg.
 AI7411;UTM  18      - 4,309,954.000   320,957.281   MT  0.99999474   -1 17 52.1
 AI7411
 AI7411!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AI7411!UTM  18      -   0.99999304  x   0.99999474  =   0.99998778
 AI7411
 AI7411_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2095709954(NAD 83)
 AI7411
 AI7411|---------------------------------------------------------------------|
 AI7411| PID    Reference Object                     Distance      Geod. Az  |
 AI7411|                                                           dddmmss.s |
 AI7411| AI7417 US NAVAL OBSERVATORY                166.171 METERS 21021     |
 AI7411|---------------------------------------------------------------------|
 AI7411
 AI7411                          SUPERSEDED SURVEY CONTROL
 AI7411
 AI7411  NAD 83(2007)-  38 55 12.88684(N)    077 03 54.91126(W) AD(2002.00) 0
 AI7411  ELLIP H (02/10/07)   44.364  (m)                       GP(2002.00)    
 AI7411  ELLIP H (08/09/02)   44.371  (m)                       GP(       ) 3 2
 AI7411  NAD 83(1991)-  38 55 12.88694(N)    077 03 54.91150(W) AD(       ) B
 AI7411  ELLIP H (08/03/00)   44.363  (m)                       GP(       ) 2 1
 AI7411
 AI7411.Superseded values are not recommended for survey control.
 AI7411
 AI7411.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AI7411.See file dsdata.pdf to determine how the superseded data were derived.
 AI7411
 AI7411_MARKER: DD = SURVEY DISK
 AI7411_SETTING: 35 = SET IN A MAT FOUNDATION OR CONCRETE SLAB OTHER THAN
 AI7411+WITH SETTING: PAVEMENT
 AI7411_SP_SET: LIGHT BASE
 AI7411_STAMPING: USNO-A GGAA 1993
 AI7411_MARK LOGO: USACE
 AI7411_MAGNETIC: N = NO MAGNETIC MATERIAL
 AI7411_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AI7411+STABILITY: SURFACE MOTION
 AI7411_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AI7411+SATELLITE: SATELLITE OBSERVATIONS - January 25, 2000
 AI7411
 AI7411  HISTORY     - Date     Condition        Report By
 AI7411  HISTORY     - 1993     MONUMENTED       DMA
 AI7411  HISTORY     - 20000125 GOOD             NGS
 AI7411
 AI7411                          STATION DESCRIPTION
 AI7411
 AI7411'DESCRIBED BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 AI7411'LOCATED AT THE US NAVAL OBSERVATORY IN WASHINGTON, D.C.  CONTACT THE
 AI7411'HEAD OF EARTH ORIENTATION DEPT.  (JIM RAY) AT 202-762-1444 BEFORE
 AI7411'ENTERING THE OBSERVATORY GROUNDS.  TO REACH GO 2.75 MILES (4.43 KM)
 AI7411'SOUTHEAST ALONG MASSACHUSETTS AVENUE FROM THE INTERSECTION WITH
 AI7411'WESTERN AVENUE AT WESTMORELAND CIRCLE AT THE MARYLAND AND DISTRICT OF
 AI7411'COLUMBIA STATE LINE, TO THE INTERSECTION OF OBSERVATORY CIRCLE NW,
 AI7411'THENCE 0.2 MILE (0.3 KM) NORTHWEST ALONG OBSERVATORY CIRCLE NORTHWEST
 AI7411'TO THE GUARD HOUSE, THENCE 0.05 MILE (0.08 KM) NORTH ALONG A PAVED
 AI7411'ROAD TO THE TOP OF INCLINE TO THE SECOND SIDEWALK LEADING TO THE
 AI7411'ENTRANCE OF BUILDING NUMBER 52, CONTINUE 0.1 MILE (0.2 KM) IN
 AI7411'NORTHERLY DIRECTION FOLLOWING THE ROAD PASSING BUILDING 59 ON LEFT TO
 AI7411'A T INTERSECTION, THENCE RIGHT AT INTERSECTION AND GO 0.05 MILE (0.08
 AI7411'KM) TO FLAG POLE CIRCLE, GO RIGHT AND PARK AT SIDEWALK LEADING TO
 AI7411'HELIPORT.  WALK SOUTH TO END OF SIDEWALK AND STATION.  18.1 FEET (5.5
 AI7411'M) WEST OF BM LAPINE, 49.6 FEET (15.1 M) SOUTHEAST OF SOUTHEAST CORNER
 AI7411'OF A 22 BY 15 FOOT (4.6 M) CONCRETE HELI PAD, 27.4 FEET (8.4 M) NORTH
 AI7411'OF A LANDING LIGHT, 28.6 FEET (8.7 M) SOUTHWEST OF A LANDING LIGHT
 AI7411'EPOXIED IN THE CONCRETE CIRCULAR BASE SURROUNDING LIGHT. NOTE--CONTACT
 AI7411'HEAD OF EARTH ORIENTATION DEPT. (JIM RAY) AT 202-762-1444 BEFORE
 AI7411'ENTERING OBSERVATORY GROUNDS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI7412 ***********************************************************************
 AI7412  DESIGNATION -  DMA US NAVAL OBSERVATORY B
 AI7412  PID         -  AI7412
 AI7412  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI7412  COUNTRY     -  US
 AI7412  USGS QUAD   -  WASHINGTON WEST (2016)
 AI7412
 AI7412                         *CURRENT SURVEY CONTROL
 AI7412  ______________________________________________________________________
 AI7412* NAD 83(2011) POSITION- 38 55 13.02642(N) 077 03 53.60726(W)   ADJUSTED
 AI7412* NAD 83(2011) ELLIP HT-    42.851 (meters)        (06/27/12)   ADJUSTED
 AI7412* NAD 83(2011) EPOCH   -  2010.00
 AI7412* NAVD 88 ORTHO HEIGHT -    74.84  (meters)      245.5   (feet) LEVELING
 AI7412  ______________________________________________________________________
 AI7412  GEOID HEIGHT    -        -31.994 (meters)                     GEOID18
 AI7412  NAD 83(2011) X  -  1,112,280.849 (meters)                     COMP
 AI7412  NAD 83(2011) Y  - -4,842,834.681 (meters)                     COMP
 AI7412  NAD 83(2011) Z  -  3,985,462.698 (meters)                     COMP
 AI7412  LAPLACE CORR    -         -2.95  (seconds)                    DEFLEC18
 AI7412  VERT ORDER      -  THIRD ?
 AI7412
 AI7412  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AI7412  Standards:
 AI7412         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AI7412            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AI7412  -------------------------------------------------------------------
 AI7412  NETWORK    0.91   1.06           0.42   0.30   0.54      0.01589605
 AI7412  -------------------------------------------------------------------
 AI7412  Click here for local accuracies and other accuracy information.
 AI7412
 AI7412.The horizontal coordinates were established by GPS observations
 AI7412.and adjusted by the National Geodetic Survey in June 2012.
 AI7412
 AI7412.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AI7412.been affixed to the stable North American tectonic plate. See 
 AI7412.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AI7412
 AI7412.The horizontal coordinates are valid at the epoch date displayed above
 AI7412.which is a decimal equivalence of Year/Month/Day.
 AI7412
 AI7412.The orthometric height was determined by differential leveling.
 AI7412.The vertical network tie was performed by a horz. field party for horz.
 AI7412.obs reductions. Reset procedures were used to establish the elevation.
 AI7412
 AI7412.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI7412.GEOID18 height accuracy estimate available here.
 AI7412
 AI7412.Click photographs - Photos may exist for this station.
 AI7412
 AI7412.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AI7412
 AI7412.The Laplace correction was computed from DEFLEC18 derived deflections.
 AI7412
 AI7412.The ellipsoidal height was determined by GPS observations
 AI7412.and is referenced to NAD 83.
 AI7412
 AI7412. The following values were computed from the NAD 83(2011) position.
 AI7412
 AI7412;                    North         East     Units Scale Factor Converg.
 AI7412;UTM  18      - 4,309,957.599   320,988.768   MT  0.99999461   -1 17 51.3
 AI7412
 AI7412!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AI7412!UTM  18      -   0.99999328  x   0.99999461  =   0.99998789
 AI7412
 AI7412_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2098809957(NAD 83)
 AI7412
 AI7412|---------------------------------------------------------------------|
 AI7412| PID    Reference Object                     Distance      Geod. Az  |
 AI7412|                                                           dddmmss.s |
 AI7412| AI7417 US NAVAL OBSERVATORY                187.420 METERS 21759     |
 AI7412|---------------------------------------------------------------------|
 AI7412
 AI7412                          SUPERSEDED SURVEY CONTROL
 AI7412
 AI7412  NAD 83(2007)-  38 55 13.02664(N)    077 03 53.60792(W) AD(2002.00) 0
 AI7412  ELLIP H (02/10/07)   42.852  (m)                       GP(2002.00)    
 AI7412  ELLIP H (08/09/02)   42.860  (m)                       GP(       ) 3 2
 AI7412  NAD 83(1991)-  38 55 13.02671(N)    077 03 53.60817(W) AD(       ) B
 AI7412  ELLIP H (08/03/00)   42.851  (m)                       GP(       ) 2 1
 AI7412
 AI7412.Superseded values are not recommended for survey control.
 AI7412
 AI7412.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AI7412.See file dsdata.pdf to determine how the superseded data were derived.
 AI7412
 AI7412_MARKER: DD = SURVEY DISK
 AI7412_SETTING: 35 = SET IN A MAT FOUNDATION OR CONCRETE SLAB OTHER THAN
 AI7412+WITH SETTING: PAVEMENT
 AI7412_SP_SET: LIGHT BASE
 AI7412_STAMPING: USNO B GGAA 1993
 AI7412_MARK LOGO: USACE
 AI7412_MAGNETIC: N = NO MAGNETIC MATERIAL
 AI7412_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AI7412+STABILITY: SURFACE MOTION
 AI7412_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AI7412+SATELLITE: SATELLITE OBSERVATIONS - January 25, 2000
 AI7412
 AI7412  HISTORY     - Date     Condition        Report By
 AI7412  HISTORY     - 1993     MONUMENTED       DMA
 AI7412  HISTORY     - 20000125 GOOD             NGS
 AI7412
 AI7412                          STATION DESCRIPTION
 AI7412
 AI7412'DESCRIBED BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 AI7412'LOCATED AT THE US NAVAL OBSERVATORY IN WASHINGTON, D.C.  CONTACT THE
 AI7412'HEAD OF EARTH ORIENTATION DEPT.  (JIM RAY) AT 202-762-1444 BEFORE
 AI7412'ENTERING THE OBSERVATORY GROUNDS.  TO REACH GO 2.75 MILES (4.43 KM)
 AI7412'SOUTHEAST ALONG MASSACHUSETTS AVENUE FROM THE INTERSECTION WITH
 AI7412'WESTERN AVENUE AT WESTMORELAND CIRCLE AT THE MARYLAND AND DISTRICT OF
 AI7412'COLUMBIA STATE LINE, TO THE INTERSECTION OF OBSERVATORY CIRCLE NW,
 AI7412'THENCE 0.2 MILE (0.3 KM) NORTHWEST ALONG OBSERVATORY CIRCLE NW TO THE
 AI7412'GUARD HOUSE, THENCE 0.05 MILE (0.08 KM) NORTH ALONG A PAVED ROAD TO
 AI7412'THE TOP OF INCLINE TO THE SECOND SIDEWALK LEADING TO THE ENTRANCE OF
 AI7412'BUILDING NUMBER 52, CONTINUE 0.1 MILE (0.2 KM) IN NORTHERLY DIRECTION
 AI7412'FOLLOWING THE ROAD PASSING BUILDING 59 ON LEFT TO A T INTERSECTION,
 AI7412'THENCE RIGHT AT INTERSECTION AND GO 0.05 MILE (0.08 KM) TO FLAGPOLE
 AI7412'CIRCLE, GO RIGHT AND PARK AT SIDEWALK LEADING TO HELIPORT.  WALK SOUTH
 AI7412'TO END OF SIDEWALK AND STATION.  THENCE 164.2 FEET (50.0 M) EASTERLY
 AI7412'ACROSS LAWN AND DIRT LAND TO MARK, 3RD LIGHT BASE EAST OF A DIRT LANE
 AI7412'NORTH-SOUTH, 87.2 FEET (26.6 M) EAST OF BM LAPINE 1997, 119.3 FEET
 AI7412'(36.4 M) SOUTHEAST OF STEEL POLE FOR WIND SOCK, 113.0 FEET (34.4 M)
 AI7412'NORTHWEST OF A STEEL POLE WITH APPROACHING WARNING LIGHT EPOXIED IN
 AI7412'THE CONCRETE CIRCULAR BASE SURROUNDING LIGHT. NOTE--CONTACT HEAD OF
 AI7412'EARTH ORIENTATION DEPT. (JIM RAY) AT 202-762-1444 BEFORE ENTERING
 AI7412'OBSERVATORY GROUNDS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4135 ***********************************************************************
 HV4135  DESIGNATION -  DOUBLE
 HV4135  PID         -  HV4135
 HV4135  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4135  COUNTRY     -  US
 HV4135  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4135
 HV4135                         *CURRENT SURVEY CONTROL
 HV4135  ______________________________________________________________________
 HV4135* NAD 83(1993) POSITION- 38 58 02.23065(N) 077 01 10.33652(W)   ADJUSTED
 HV4135  ______________________________________________________________________
 HV4135  GEOID HEIGHT    -        -32.000 (meters)                     GEOID18
 HV4135  LAPLACE CORR    -         -2.58  (seconds)                    DEFLEC18
 HV4135  HORZ ORDER      -  THIRD
 HV4135
 HV4135.The horizontal coordinates were established by classical geodetic methods
 HV4135.and adjusted by the National Geodetic Survey in November 1994.
 HV4135
 HV4135.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4135.GEOID18 height accuracy estimate available here.
 HV4135
 HV4135.Click photographs - Photos may exist for this station.
 HV4135
 HV4135.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4135
 HV4135. The following values were computed from the NAD 83(1993) position.
 HV4135
 HV4135;                    North         East     Units Scale Factor Converg.
 HV4135;SPC MD       -   144,374.847   398,306.804   MT  0.99995112   -0 00 44.1
 HV4135;SPC MD       -   473,669.81  1,306,778.24   sFT  0.99995112   -0 00 44.1
 HV4135;SPC VA N     - 2,145,404.130 3,628,296.342   MT  0.99996698   +0 55 26.3
 HV4135;SPC VA N     - 7,038,713.38 11,903,835.58   sFT  0.99996698   +0 55 26.3
 HV4135;UTM  18      - 4,315,085.919   325,036.516   MT  0.99997696   -1 16 13.3
 HV4135
 HV4135_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2503615085(NAD 83)
 HV4135
 HV4135                          SUPERSEDED SURVEY CONTROL
 HV4135
 HV4135  NAD 83(1991)-  38 58 02.23001(N)    077 01 10.33741(W) AD(       ) 3
 HV4135  NAD 83(1986)-  38 58 02.22921(N)    077 01 10.34757(W) AD(       ) 3
 HV4135  NAD 27      -  38 58 01.85700(N)    077 01 11.38300(W) AD(       ) 3
 HV4135
 HV4135.Superseded values are not recommended for survey control.
 HV4135
 HV4135.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4135.See file dsdata.pdf to determine how the superseded data were derived.
 HV4135
 HV4135_MARKER: 85 = CHIMNEY
 HV4135
 HV4135  HISTORY     - Date     Condition        Report By
 HV4135  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4135
 HV4135                          STATION DESCRIPTION
 HV4135
 HV4135'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4135'STATION IS THE FINIAL WEATHER VANE - ON THE OCTAGONAL, DOUBLE
 HV4135'CUPOLA OF THE CALVIN COOLIDGE HIGH SCHOOL ERECTED IN 1938 ON
 HV4135'THE E SIDE OF FIFTH STREET AT TUCKERMAN STREET, N.W.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2128 ***********************************************************************
 HV2128  DESIGNATION -  DTP 1 MADHOP
 HV2128  PID         -  HV2128
 HV2128  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2128  COUNTRY     -  US
 HV2128  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2128
 HV2128                         *CURRENT SURVEY CONTROL
 HV2128  ______________________________________________________________________
 HV2128* NAD 83(1986) POSITION- 38 57 41.     (N) 077 02 37.     (W)   SCALED
 HV2128* NAVD 88 ORTHO HEIGHT -    51.508 (meters)      168.99  (feet) ADJUSTED
 HV2128  ______________________________________________________________________
 HV2128  GEOID HEIGHT    -        -31.974 (meters)                     GEOID18
 HV2128  DYNAMIC HEIGHT  -         51.481 (meters)      168.90  (feet) COMP
 HV2128  MODELED GRAVITY -    980,088.7   (mgal)                       NAVD 88
 HV2128
 HV2128  VERT ORDER      -  SECOND    CLASS 0
 HV2128
 HV2128.The horizontal coordinates were scaled from a map and have
 HV2128.an estimated accuracy of +/- 6 seconds.
 HV2128
 HV2128.The orthometric height was determined by differential leveling and
 HV2128.adjusted by the NATIONAL GEODETIC SURVEY
 HV2128.in June 1991.
 HV2128
 HV2128.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2128.GEOID18 height accuracy estimate available here.
 HV2128
 HV2128.Click photographs - Photos may exist for this station.
 HV2128
 HV2128.The dynamic height is computed by dividing the NAVD 88
 HV2128.geopotential number by the normal gravity value computed on the
 HV2128.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2128.degrees latitude (g = 980.6199 gals.).
 HV2128
 HV2128.The modeled gravity was interpolated from observed gravity values.
 HV2128
 HV2128
 HV2128_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ229144(NAD 83)
 HV2128
 HV2128                          SUPERSEDED SURVEY CONTROL
 HV2128
 HV2128  NGVD 29 (11/26/84)   51.738  (m)          169.74   (f) ADJUSTED    2 0
 HV2128
 HV2128.Superseded values are not recommended for survey control.
 HV2128
 HV2128.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2128.See file dsdata.pdf to determine how the superseded data were derived.
 HV2128
 HV2128_MARKER: N = NAIL
 HV2128_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2128_SP_SET: CATCH BASIN
 HV2128_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2128
 HV2128  HISTORY     - Date     Condition        Report By
 HV2128  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2128  HISTORY     - 1960     GOOD             MADHOP
 HV2128
 HV2128                          STATION DESCRIPTION
 HV2128
 HV2128'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2128'IN WASHINGTON DC.
 HV2128'0.5 MI. WEST ON MISSOURI AVE. FROM 16TH ST. N.W. LOCATED IN
 HV2128'NORTH EAST CORNER OF CATCH BASIN IN MEDIAN OF MISSOURI AVE. ON
 HV2128'BRIDGE OVER ROCK CREEK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2157 ***********************************************************************
 HV2157  DESIGNATION -  DTP 10 MADHOP
 HV2157  PID         -  HV2157
 HV2157  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2157  COUNTRY     -  US
 HV2157  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2157
 HV2157                         *CURRENT SURVEY CONTROL
 HV2157  ______________________________________________________________________
 HV2157* NAD 83(1986) POSITION- 38 56 00.     (N) 077 04 48.     (W)   SCALED
 HV2157* NAVD 88 ORTHO HEIGHT -    93.809 (meters)      307.77  (feet) ADJUSTED
 HV2157  ______________________________________________________________________
 HV2157  GEOID HEIGHT    -        -31.952 (meters)                     GEOID18
 HV2157  DYNAMIC HEIGHT  -         93.758 (meters)      307.60  (feet) COMP
 HV2157  MODELED GRAVITY -    980,083.6   (mgal)                       NAVD 88
 HV2157
 HV2157  VERT ORDER      -  SECOND    CLASS 0
 HV2157
 HV2157.The horizontal coordinates were scaled from a map and have
 HV2157.an estimated accuracy of +/- 6 seconds.
 HV2157
 HV2157.The orthometric height was determined by differential leveling and
 HV2157.adjusted by the NATIONAL GEODETIC SURVEY
 HV2157.in June 1991.
 HV2157
 HV2157.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2157.GEOID18 height accuracy estimate available here.
 HV2157
 HV2157.Click photographs - Photos may exist for this station.
 HV2157
 HV2157.The dynamic height is computed by dividing the NAVD 88
 HV2157.geopotential number by the normal gravity value computed on the
 HV2157.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2157.degrees latitude (g = 980.6199 gals.).
 HV2157
 HV2157.The modeled gravity was interpolated from observed gravity values.
 HV2157
 HV2157
 HV2157_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ197114(NAD 83)
 HV2157
 HV2157                          SUPERSEDED SURVEY CONTROL
 HV2157
 HV2157  NGVD 29 (11/26/84)   94.032  (m)          308.50   (f) ADJUSTED    2 0
 HV2157
 HV2157.Superseded values are not recommended for survey control.
 HV2157
 HV2157.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2157.See file dsdata.pdf to determine how the superseded data were derived.
 HV2157
 HV2157_MARKER: N = NAIL
 HV2157_SETTING: 0 = UNSPECIFIED SETTING
 HV2157_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2157
 HV2157  HISTORY     - Date     Condition        Report By
 HV2157  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2157  HISTORY     - 1960     GOOD             MADHOP
 HV2157
 HV2157                          STATION DESCRIPTION
 HV2157
 HV2157'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2157'IN WASHINGTON DC.
 HV2157'LOCATED AT THE Y INTERSECTION OF MASSACHUSETTS AVE. N.W. AND
 HV2157'MACOMB ST. N.W.   0.20 FT WEST OF THE EAST TREE BOX AT THE
 HV2157'INTERSECTION, AND 0.60 FT NORTH OF NORTH CURB FACE OF MACOMB
 HV2157'ST.  A RAMSET NAIL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2160 ***********************************************************************
 HV2160  DESIGNATION -  DTP 11 MADHOP
 HV2160  PID         -  HV2160
 HV2160  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2160  COUNTRY     -  US
 HV2160  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2160
 HV2160                         *CURRENT SURVEY CONTROL
 HV2160  ______________________________________________________________________
 HV2160* NAD 83(1986) POSITION- 38 54 51.     (N) 077 02 47.     (W)   SCALED
 HV2160* NAVD 88 ORTHO HEIGHT -    33.739 (meters)      110.69  (feet) ADJUSTED
 HV2160  ______________________________________________________________________
 HV2160  GEOID HEIGHT    -        -32.029 (meters)                     GEOID18
 HV2160  DYNAMIC HEIGHT  -         33.721 (meters)      110.63  (feet) COMP
 HV2160  MODELED GRAVITY -    980,094.5   (mgal)                       NAVD 88
 HV2160
 HV2160  VERT ORDER      -  SECOND    CLASS 0
 HV2160
 HV2160.The horizontal coordinates were scaled from a map and have
 HV2160.an estimated accuracy of +/- 6 seconds.
 HV2160
 HV2160.The orthometric height was determined by differential leveling and
 HV2160.adjusted by the NATIONAL GEODETIC SURVEY
 HV2160.in June 1991.
 HV2160
 HV2160.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2160.GEOID18 height accuracy estimate available here.
 HV2160
 HV2160.Click photographs - Photos may exist for this station.
 HV2160
 HV2160.The dynamic height is computed by dividing the NAVD 88
 HV2160.geopotential number by the normal gravity value computed on the
 HV2160.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2160.degrees latitude (g = 980.6199 gals.).
 HV2160
 HV2160.The modeled gravity was interpolated from observed gravity values.
 HV2160
 HV2160
 HV2160_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ225092(NAD 83)
 HV2160
 HV2160                          SUPERSEDED SURVEY CONTROL
 HV2160
 HV2160  NGVD 29 (11/26/84)   33.967  (m)          111.44   (f) ADJUSTED    2 0
 HV2160
 HV2160.Superseded values are not recommended for survey control.
 HV2160
 HV2160.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2160.See file dsdata.pdf to determine how the superseded data were derived.
 HV2160
 HV2160_MARKER: N = NAIL
 HV2160_SETTING: 0 = UNSPECIFIED SETTING
 HV2160_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2160
 HV2160  HISTORY     - Date     Condition        Report By
 HV2160  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2160  HISTORY     - 1960     GOOD             MADHOP
 HV2160
 HV2160                          STATION DESCRIPTION
 HV2160
 HV2160'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2160'IN WASHINGTON DC.
 HV2160'LOCATED AT THE INTERSECTION OF FLORIDA AVE. N.W. AND CONN. AVE.
 HV2160'N.W. 3.07 FT NORTHEAST OF L.S. ON SIDEWALK AT INTERSECTION,
 HV2160'AND 2.0 FT NORTHWEST OF CURB FACE.  IN NORTHWEST CORNER OF
 HV2160'INTERSECTION.  A RAMSET NAIL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2165 ***********************************************************************
 HV2165  DESIGNATION -  DTP 12 MADHOP
 HV2165  PID         -  HV2165
 HV2165  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2165  COUNTRY     -  US
 HV2165  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2165
 HV2165                         *CURRENT SURVEY CONTROL
 HV2165  ______________________________________________________________________
 HV2165* NAD 83(1986) POSITION- 38 54 17.     (N) 077 04 03.     (W)   SCALED
 HV2165* NAVD 88 ORTHO HEIGHT -    23.453 (meters)       76.95  (feet) ADJUSTED
 HV2165  ______________________________________________________________________
 HV2165  GEOID HEIGHT    -        -32.019 (meters)                     GEOID18
 HV2165  DYNAMIC HEIGHT  -         23.440 (meters)       76.90  (feet) COMP
 HV2165  MODELED GRAVITY -    980,092.3   (mgal)                       NAVD 88
 HV2165
 HV2165  VERT ORDER      -  SECOND    CLASS 0
 HV2165
 HV2165.The horizontal coordinates were scaled from a map and have
 HV2165.an estimated accuracy of +/- 6 seconds.
 HV2165
 HV2165.The orthometric height was determined by differential leveling and
 HV2165.adjusted by the NATIONAL GEODETIC SURVEY
 HV2165.in June 1991.
 HV2165
 HV2165.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2165.GEOID18 height accuracy estimate available here.
 HV2165
 HV2165.Click photographs - Photos may exist for this station.
 HV2165
 HV2165.The dynamic height is computed by dividing the NAVD 88
 HV2165.geopotential number by the normal gravity value computed on the
 HV2165.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2165.degrees latitude (g = 980.6199 gals.).
 HV2165
 HV2165.The modeled gravity was interpolated from observed gravity values.
 HV2165
 HV2165
 HV2165_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ207082(NAD 83)
 HV2165
 HV2165                          SUPERSEDED SURVEY CONTROL
 HV2165
 HV2165  NGVD 29 (11/26/84)   23.684  (m)           77.70   (f) ADJUSTED    2 0
 HV2165
 HV2165.Superseded values are not recommended for survey control.
 HV2165
 HV2165.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2165.See file dsdata.pdf to determine how the superseded data were derived.
 HV2165
 HV2165_MARKER: N = NAIL
 HV2165_SETTING: 0 = UNSPECIFIED SETTING
 HV2165_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2165
 HV2165  HISTORY     - Date     Condition        Report By
 HV2165  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2165  HISTORY     - 1960     GOOD             MADHOP
 HV2165
 HV2165                          STATION DESCRIPTION
 HV2165
 HV2165'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2165'IN WASHINGTON DC.
 HV2165'LOCATED AT INTERSECTION OF M ST. N.W. AND 34TH ST. N.W. NEXT TO
 HV2165'GENERAL AUTO GLASS.  9 FT TOWARD 34TH ST. FROM FRONT CORNER
 HV2165'OF GENERAL AUTO GLASS, AND 0.30 FT FROM BACK EDGE OF SIDEWALK.
 HV2165'A RAMSET NAIL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2170 ***********************************************************************
 HV2170  DESIGNATION -  DTP 13 MADHOP
 HV2170  PID         -  HV2170
 HV2170  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2170  COUNTRY     -  US
 HV2170  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2170
 HV2170                         *CURRENT SURVEY CONTROL
 HV2170  ______________________________________________________________________
 HV2170* NAD 83(1986) POSITION- 38 56 08.     (N) 077 06 24.     (W)   SCALED
 HV2170* NAVD 88 ORTHO HEIGHT -    74.278 (meters)      243.69  (feet) ADJUSTED
 HV2170  ______________________________________________________________________
 HV2170  GEOID HEIGHT    -        -31.921 (meters)                     GEOID18
 HV2170  DYNAMIC HEIGHT  -         74.238 (meters)      243.56  (feet) COMP
 HV2170  MODELED GRAVITY -    980,089.7   (mgal)                       NAVD 88
 HV2170
 HV2170  VERT ORDER      -  SECOND    CLASS 0
 HV2170
 HV2170.The horizontal coordinates were scaled from a map and have
 HV2170.an estimated accuracy of +/- 6 seconds.
 HV2170
 HV2170.The orthometric height was determined by differential leveling and
 HV2170.adjusted by the NATIONAL GEODETIC SURVEY
 HV2170.in June 1991.
 HV2170
 HV2170.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2170.GEOID18 height accuracy estimate available here.
 HV2170
 HV2170.Click photographs - Photos may exist for this station.
 HV2170
 HV2170.The dynamic height is computed by dividing the NAVD 88
 HV2170.geopotential number by the normal gravity value computed on the
 HV2170.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2170.degrees latitude (g = 980.6199 gals.).
 HV2170
 HV2170.The modeled gravity was interpolated from observed gravity values.
 HV2170
 HV2170
 HV2170_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ174117(NAD 83)
 HV2170
 HV2170                          SUPERSEDED SURVEY CONTROL
 HV2170
 HV2170  NGVD 29 (11/26/84)   74.504  (m)          244.44   (f) ADJUSTED    2 0
 HV2170
 HV2170.Superseded values are not recommended for survey control.
 HV2170
 HV2170.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2170.See file dsdata.pdf to determine how the superseded data were derived.
 HV2170
 HV2170_MARKER: N = NAIL
 HV2170_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2170_SP_SET: CURB
 HV2170_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2170
 HV2170  HISTORY     - Date     Condition        Report By
 HV2170  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2170  HISTORY     - 1960     GOOD             MADHOP
 HV2170
 HV2170                          STATION DESCRIPTION
 HV2170
 HV2170'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2170'IN WASHINGTON DC.
 HV2170'LOCATED IN THE NORTHEAST CORNER OF THE ISLAND BETWEEN DALE CARLIA
 HV2170'PARKWAY N.W. AND LOUGHBORO RD. N.W.  A RAM SET NAIL 0.25 FT.
 HV2170'WEST OF P.T. IN TOP OF CURB.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1480 ***********************************************************************
 HV1480  DESIGNATION -  DTP 15 MADHOP
 HV1480  PID         -  HV1480
 HV1480  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1480  COUNTRY     -  US
 HV1480  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1480
 HV1480                         *CURRENT SURVEY CONTROL
 HV1480  ______________________________________________________________________
 HV1480* NAD 83(1986) POSITION- 38 55 05.     (N) 076 56 36.     (W)   SCALED
 HV1480* NAVD 88 ORTHO HEIGHT -     8.694 (meters)       28.52  (feet) ADJUSTED
 HV1480  ______________________________________________________________________
 HV1480  GEOID HEIGHT    -        -32.213 (meters)                     GEOID18
 HV1480  DYNAMIC HEIGHT  -          8.690 (meters)       28.51  (feet) COMP
 HV1480  MODELED GRAVITY -    980,097.3   (mgal)                       NAVD 88
 HV1480
 HV1480  VERT ORDER      -  SECOND    CLASS 0
 HV1480
 HV1480.The horizontal coordinates were scaled from a map and have
 HV1480.an estimated accuracy of +/- 6 seconds.
 HV1480
 HV1480.The orthometric height was determined by differential leveling and
 HV1480.adjusted by the NATIONAL GEODETIC SURVEY
 HV1480.in June 1991.
 HV1480
 HV1480.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1480.GEOID18 height accuracy estimate available here.
 HV1480
 HV1480.Click photographs - Photos may exist for this station.
 HV1480
 HV1480.The dynamic height is computed by dividing the NAVD 88
 HV1480.geopotential number by the normal gravity value computed on the
 HV1480.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1480.degrees latitude (g = 980.6199 gals.).
 HV1480
 HV1480.The modeled gravity was interpolated from observed gravity values.
 HV1480
 HV1480
 HV1480_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ315094(NAD 83)
 HV1480
 HV1480                          SUPERSEDED SURVEY CONTROL
 HV1480
 HV1480  NGVD 29 (11/26/84)    8.930  (m)           29.30   (f) ADJUSTED    2 0
 HV1480
 HV1480.Superseded values are not recommended for survey control.
 HV1480
 HV1480.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1480.See file dsdata.pdf to determine how the superseded data were derived.
 HV1480
 HV1480_MARKER: N = NAIL
 HV1480_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1480_SP_SET: BRIDGE
 HV1480_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1480
 HV1480  HISTORY     - Date     Condition        Report By
 HV1480  HISTORY     - UNK      MONUMENTED       MADHOP
 HV1480  HISTORY     - 1960     GOOD             MADHOP
 HV1480
 HV1480                          STATION DESCRIPTION
 HV1480
 HV1480'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1480'IN DC.
 HV1480'LOACTED ON WASH,-BALT, PKWY, NORTH BOUND BRIDGE OVER ANACOSTIA
 HV1480'RIVER.  1.39 FT SOUTHWEST OF VENT, AND 0.25 FT NORTHWEST OF
 HV1480'BRIDGE EDGE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2129 ***********************************************************************
 HV2129  DESIGNATION -  DTP 2 MADHOP
 HV2129  PID         -  HV2129
 HV2129  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2129  COUNTRY     -  US
 HV2129  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2129
 HV2129                         *CURRENT SURVEY CONTROL
 HV2129  ______________________________________________________________________
 HV2129* NAD 83(1986) POSITION- 38 57 39.     (N) 077 03 22.     (W)   SCALED
 HV2129* NAVD 88 ORTHO HEIGHT -    93.230 (meters)      305.87  (feet) ADJUSTED
 HV2129  ______________________________________________________________________
 HV2129  GEOID HEIGHT    -        -31.957 (meters)                     GEOID18
 HV2129  DYNAMIC HEIGHT  -         93.179 (meters)      305.70  (feet) COMP
 HV2129  MODELED GRAVITY -    980,085.8   (mgal)                       NAVD 88
 HV2129
 HV2129  VERT ORDER      -  SECOND    CLASS 0
 HV2129
 HV2129.The horizontal coordinates were scaled from a map and have
 HV2129.an estimated accuracy of +/- 6 seconds.
 HV2129
 HV2129.The orthometric height was determined by differential leveling and
 HV2129.adjusted by the NATIONAL GEODETIC SURVEY
 HV2129.in June 1991.
 HV2129
 HV2129.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2129.GEOID18 height accuracy estimate available here.
 HV2129
 HV2129.Click photographs - Photos may exist for this station.
 HV2129
 HV2129.The dynamic height is computed by dividing the NAVD 88
 HV2129.geopotential number by the normal gravity value computed on the
 HV2129.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2129.degrees latitude (g = 980.6199 gals.).
 HV2129
 HV2129.The modeled gravity was interpolated from observed gravity values.
 HV2129
 HV2129
 HV2129_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ218144(NAD 83)
 HV2129
 HV2129                          SUPERSEDED SURVEY CONTROL
 HV2129
 HV2129  NGVD 29 (11/26/84)   93.459  (m)          306.62   (f) ADJUSTED    2 0
 HV2129
 HV2129.Superseded values are not recommended for survey control.
 HV2129
 HV2129.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2129.See file dsdata.pdf to determine how the superseded data were derived.
 HV2129
 HV2129_MARKER: N = NAIL
 HV2129_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2129_SP_SET: MEDIAN STRIP
 HV2129_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2129
 HV2129  HISTORY     - Date     Condition        Report By
 HV2129  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2129  HISTORY     - 1960     GOOD             MADHOP
 HV2129
 HV2129                          STATION DESCRIPTION
 HV2129
 HV2129'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2129'IN WASHINGTON DC.
 HV2129'LOCATED IN WEST EDGE OF THE MEDIAN STRIP AT THE INTERSECTION OF
 HV2129'27TH ST. N.W. AND MISSOURI AVE. N.W. 1.0 FT EAST FROM ROAD EDGE
 HV2129'INTO MEDIAN STRIP AND 4.5 FT WEST OF LAMP POST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2134 ***********************************************************************
 HV2134  DESIGNATION -  DTP 3 MADHOP
 HV2134  PID         -  HV2134
 HV2134  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2134  COUNTRY     -  US
 HV2134  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2134
 HV2134                         *CURRENT SURVEY CONTROL
 HV2134  ______________________________________________________________________
 HV2134* NAD 83(1986) POSITION- 38 58 55.     (N) 077 02 33.     (W)   SCALED
 HV2134* NAVD 88 ORTHO HEIGHT -    65.071 (meters)      213.49  (feet) ADJUSTED
 HV2134  ______________________________________________________________________
 HV2134  GEOID HEIGHT    -        -31.960 (meters)                     GEOID18
 HV2134  DYNAMIC HEIGHT  -         65.035 (meters)      213.37  (feet) COMP
 HV2134  MODELED GRAVITY -    980,086.7   (mgal)                       NAVD 88
 HV2134
 HV2134  VERT ORDER      -  SECOND    CLASS 0
 HV2134
 HV2134.The horizontal coordinates were scaled from a map and have
 HV2134.an estimated accuracy of +/- 6 seconds.
 HV2134
 HV2134.The orthometric height was determined by differential leveling and
 HV2134.adjusted by the NATIONAL GEODETIC SURVEY
 HV2134.in June 1991.
 HV2134
 HV2134.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2134.GEOID18 height accuracy estimate available here.
 HV2134
 HV2134.Click photographs - Photos may exist for this station.
 HV2134
 HV2134.The dynamic height is computed by dividing the NAVD 88
 HV2134.geopotential number by the normal gravity value computed on the
 HV2134.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2134.degrees latitude (g = 980.6199 gals.).
 HV2134
 HV2134.The modeled gravity was interpolated from observed gravity values.
 HV2134
 HV2134
 HV2134_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ230167(NAD 83)
 HV2134
 HV2134                          SUPERSEDED SURVEY CONTROL
 HV2134
 HV2134  NGVD 29 (11/26/84)   65.302  (m)          214.25   (f) ADJUSTED    2 0
 HV2134
 HV2134.Superseded values are not recommended for survey control.
 HV2134
 HV2134.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2134.See file dsdata.pdf to determine how the superseded data were derived.
 HV2134
 HV2134_MARKER: N = NAIL
 HV2134_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2134_SP_SET: STREET
 HV2134_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2134
 HV2134  HISTORY     - Date     Condition        Report By
 HV2134  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2134  HISTORY     - 1960     GOOD             MADHOP
 HV2134
 HV2134                          STATION DESCRIPTION
 HV2134
 HV2134'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2134'IN WASHINGTON DC.
 HV2134'AT THE INTERSECTION OF BEACH DR. N.W. AND WISE RD. N.W. 3.5 FT
 HV2134'NORTH OF THE STOP SIGN IN THE SOUTH ISLAND OF THE INTERSECTION.
 HV2134'A RAMSET NAIL ON THE NORTHEAST EDGE OF THE SOUTH ISLAND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2141 ***********************************************************************
 HV2141  DESIGNATION -  DTP 4 MADHOP
 HV2141  PID         -  HV2141
 HV2141  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2141  COUNTRY     -  US
 HV2141  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2141
 HV2141                         *CURRENT SURVEY CONTROL
 HV2141  ______________________________________________________________________
 HV2141* NAD 83(1986) POSITION- 38 56 24.     (N) 077 02 07.     (W)   SCALED
 HV2141* NAVD 88 ORTHO HEIGHT -    43.439 (meters)      142.52  (feet) ADJUSTED
 HV2141  ______________________________________________________________________
 HV2141  GEOID HEIGHT    -        -32.005 (meters)                     GEOID18
 HV2141  DYNAMIC HEIGHT  -         43.416 (meters)      142.44  (feet) COMP
 HV2141  MODELED GRAVITY -    980,094.6   (mgal)                       NAVD 88
 HV2141
 HV2141  VERT ORDER      -  SECOND    CLASS 0
 HV2141
 HV2141.The horizontal coordinates were scaled from a map and have
 HV2141.an estimated accuracy of +/- 6 seconds.
 HV2141
 HV2141.The orthometric height was determined by differential leveling and
 HV2141.adjusted by the NATIONAL GEODETIC SURVEY
 HV2141.in June 1991.
 HV2141
 HV2141.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2141.GEOID18 height accuracy estimate available here.
 HV2141
 HV2141.Click photographs - Photos may exist for this station.
 HV2141
 HV2141.The dynamic height is computed by dividing the NAVD 88
 HV2141.geopotential number by the normal gravity value computed on the
 HV2141.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2141.degrees latitude (g = 980.6199 gals.).
 HV2141
 HV2141.The modeled gravity was interpolated from observed gravity values.
 HV2141
 HV2141
 HV2141_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ236120(NAD 83)
 HV2141
 HV2141                          SUPERSEDED SURVEY CONTROL
 HV2141
 HV2141  NGVD 29 (11/26/84)   43.670  (m)          143.27   (f) ADJUSTED    2 0
 HV2141
 HV2141.Superseded values are not recommended for survey control.
 HV2141
 HV2141.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2141.See file dsdata.pdf to determine how the superseded data were derived.
 HV2141
 HV2141_MARKER: N = NAIL
 HV2141_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2141_SP_SET: CURB
 HV2141_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2141
 HV2141  HISTORY     - Date     Condition        Report By
 HV2141  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2141  HISTORY     - 1960     GOOD             MADHOP
 HV2141
 HV2141                          STATION DESCRIPTION
 HV2141
 HV2141'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2141'IN WASHINGTON DC.
 HV2141'AT THE INTERSECTION OF ARKANSAS AVE. N.W. AND PINEY BRANCH RD. N.W.
 HV2141'ON THE WEST CORNER OF Y INTERSECTION.  500 FT EAST OF 16TH ST.
 HV2141'BRIDGE OVER ROCK CREEK, AND EAST OF THE CATCH BASIN ON ARKANSAS
 HV2141'AVE ON THE WEST CORNER OF THE INTERSECTION.  A RAMSET NAIL IN TOP
 HV2141'OF THE CURB OF ARKANSAS AVE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2142 ***********************************************************************
 HV2142  DESIGNATION -  DTP 5 MADHOP
 HV2142  PID         -  HV2142
 HV2142  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2142  COUNTRY     -  US
 HV2142  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2142
 HV2142                         *CURRENT SURVEY CONTROL
 HV2142  ______________________________________________________________________
 HV2142* NAD 83(1986) POSITION- 38 56 08.     (N) 077 02 45.     (W)   SCALED
 HV2142* NAVD 88 ORTHO HEIGHT -    19.452 (meters)       63.82  (feet) ADJUSTED
 HV2142  ______________________________________________________________________
 HV2142  GEOID HEIGHT    -        -32.000 (meters)                     GEOID18
 HV2142  DYNAMIC HEIGHT  -         19.441 (meters)       63.78  (feet) COMP
 HV2142  MODELED GRAVITY -    980,091.2   (mgal)                       NAVD 88
 HV2142
 HV2142  VERT ORDER      -  SECOND    CLASS 0
 HV2142
 HV2142.The horizontal coordinates were scaled from a map and have
 HV2142.an estimated accuracy of +/- 6 seconds.
 HV2142
 HV2142.The orthometric height was determined by differential leveling and
 HV2142.adjusted by the NATIONAL GEODETIC SURVEY
 HV2142.in June 1991.
 HV2142
 HV2142.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2142.GEOID18 height accuracy estimate available here.
 HV2142
 HV2142.Click photographs - Photos may exist for this station.
 HV2142
 HV2142.The dynamic height is computed by dividing the NAVD 88
 HV2142.geopotential number by the normal gravity value computed on the
 HV2142.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2142.degrees latitude (g = 980.6199 gals.).
 HV2142
 HV2142.The modeled gravity was interpolated from observed gravity values.
 HV2142
 HV2142
 HV2142_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ226116(NAD 83)
 HV2142
 HV2142                          SUPERSEDED SURVEY CONTROL
 HV2142
 HV2142  NGVD 29 (11/26/84)   19.682  (m)           64.57   (f) ADJUSTED    2 0
 HV2142
 HV2142.Superseded values are not recommended for survey control.
 HV2142
 HV2142.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2142.See file dsdata.pdf to determine how the superseded data were derived.
 HV2142
 HV2142_MARKER: N = NAIL
 HV2142_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2142_SP_SET: CURB
 HV2142_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2142
 HV2142  HISTORY     - Date     Condition        Report By
 HV2142  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2142  HISTORY     - 1960     GOOD             MADHOP
 HV2142  HISTORY     - 20081204 MARK NOT FOUND   AMTHOM
 HV2142
 HV2142                          STATION DESCRIPTION
 HV2142
 HV2142'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2142'IN WASHINGTON DC.
 HV2142'0.5 MI. WEST OF 16TH ST. N.W. ON PINEY BRANCH RD. UNDER PARK
 HV2142'RD. N.W. BRIDGE OVER ROCK CREEK.  A RAMSET NAIL IN NORTH CURB OF
 HV2142'PINEY BRANCH RD. IN LINE WITH EAST ABUTMENT WALL OF PARK RD
 HV2142'BRIDGE.
 HV2142
 HV2142                          STATION RECOVERY (2008)
 HV2142
 HV2142'RECOVERY NOTE BY A MORTON THOMAS AND ASSOCIATES 2008 (JAN)
 HV2142'HIGH SPEED MOUNTABLE CURB APPEARS NEWER THAN 1960
 HV2142'CURB BROKEN AND IN POOR CONDITION
 HV2142'NO SIGN OF NAIL IN TOP OF CURB
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2143 ***********************************************************************
 HV2143  DESIGNATION -  DTP 6 MADHOP
 HV2143  PID         -  HV2143
 HV2143  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2143  COUNTRY     -  US
 HV2143  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2143
 HV2143                         *CURRENT SURVEY CONTROL
 HV2143  ______________________________________________________________________
 HV2143* NAD 83(1986) POSITION- 38 56 04.     (N) 077 03 11.     (W)   SCALED
 HV2143* NAVD 88 ORTHO HEIGHT -    27.217 (meters)       89.29  (feet) ADJUSTED
 HV2143  ______________________________________________________________________
 HV2143  GEOID HEIGHT    -        -31.993 (meters)                     GEOID18
 HV2143  DYNAMIC HEIGHT  -         27.202 (meters)       89.25  (feet) COMP
 HV2143  MODELED GRAVITY -    980,088.7   (mgal)                       NAVD 88
 HV2143
 HV2143  VERT ORDER      -  SECOND    CLASS 0
 HV2143
 HV2143.The horizontal coordinates were scaled from a map and have
 HV2143.an estimated accuracy of +/- 6 seconds.
 HV2143
 HV2143.The orthometric height was determined by differential leveling and
 HV2143.adjusted by the NATIONAL GEODETIC SURVEY
 HV2143.in June 1991.
 HV2143
 HV2143.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2143.GEOID18 height accuracy estimate available here.
 HV2143
 HV2143.Click photographs - Photos may exist for this station.
 HV2143
 HV2143.The dynamic height is computed by dividing the NAVD 88
 HV2143.geopotential number by the normal gravity value computed on the
 HV2143.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2143.degrees latitude (g = 980.6199 gals.).
 HV2143
 HV2143.The modeled gravity was interpolated from observed gravity values.
 HV2143
 HV2143
 HV2143_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ220115(NAD 83)
 HV2143
 HV2143                          SUPERSEDED SURVEY CONTROL
 HV2143
 HV2143  NGVD 29 (11/26/84)   27.446  (m)           90.05   (f) ADJUSTED    2 0
 HV2143
 HV2143.Superseded values are not recommended for survey control.
 HV2143
 HV2143.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2143.See file dsdata.pdf to determine how the superseded data were derived.
 HV2143
 HV2143_MARKER: N = NAIL
 HV2143_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2143_SP_SET: CURB
 HV2143_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2143
 HV2143  HISTORY     - Date     Condition        Report By
 HV2143  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2143  HISTORY     - 1960     GOOD             MADHOP
 HV2143
 HV2143                          STATION DESCRIPTION
 HV2143
 HV2143'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2143'IN WASHINGTON DC.
 HV2143'ON THE WEST EDGE OF MEDIAN STRIP ON PORTER ST. N.W. 0.5 MI. EAST
 HV2143'OF CONN. AVE. N.W. AND 500 FT WEST OF BRIDGE OVER ROCK CREEK.
 HV2143'49.0 FT SOUTHWEST OF A TACK AND WASHER ON PEPCO POLE 120046.
 HV2143'P.E.P.C.O. POLE IS ON NORTH SIDE OF PORTER ST. AND 200 FT WEST
 HV2143'OF WILLIAMSBURG LA. DTP 6 IS A RAMSET NAIL IN CURB OF MEDIAN
 HV2143'STRIP.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2148 ***********************************************************************
 HV2148  DESIGNATION -  DTP 7 MADHOP
 HV2148  PID         -  HV2148
 HV2148  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2148  COUNTRY     -  US
 HV2148  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2148
 HV2148                         *CURRENT SURVEY CONTROL
 HV2148  ______________________________________________________________________
 HV2148* NAD 83(1986) POSITION- 38 56 52.     (N) 077 04 21.     (W)   SCALED
 HV2148* NAVD 88 ORTHO HEIGHT -    94.638 (meters)      310.49  (feet) ADJUSTED
 HV2148  ______________________________________________________________________
 HV2148  GEOID HEIGHT    -        -31.947 (meters)                     GEOID18
 HV2148  DYNAMIC HEIGHT  -         94.586 (meters)      310.32  (feet) COMP
 HV2148  MODELED GRAVITY -    980,082.7   (mgal)                       NAVD 88
 HV2148
 HV2148  VERT ORDER      -  SECOND    CLASS 0
 HV2148
 HV2148.The horizontal coordinates were scaled from a map and have
 HV2148.an estimated accuracy of +/- 6 seconds.
 HV2148
 HV2148.The orthometric height was determined by differential leveling and
 HV2148.adjusted by the NATIONAL GEODETIC SURVEY
 HV2148.in June 1991.
 HV2148
 HV2148.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2148.GEOID18 height accuracy estimate available here.
 HV2148
 HV2148.Click photographs - Photos may exist for this station.
 HV2148
 HV2148.The dynamic height is computed by dividing the NAVD 88
 HV2148.geopotential number by the normal gravity value computed on the
 HV2148.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2148.degrees latitude (g = 980.6199 gals.).
 HV2148
 HV2148.The modeled gravity was interpolated from observed gravity values.
 HV2148
 HV2148
 HV2148_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ203130(NAD 83)
 HV2148
 HV2148                          SUPERSEDED SURVEY CONTROL
 HV2148
 HV2148  NGVD 29 (11/26/84)   94.862  (m)          311.23   (f) ADJUSTED    2 0
 HV2148
 HV2148.Superseded values are not recommended for survey control.
 HV2148
 HV2148.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2148.See file dsdata.pdf to determine how the superseded data were derived.
 HV2148
 HV2148_MARKER: N = NAIL
 HV2148_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2148_SP_SET: CURB
 HV2148_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2148
 HV2148  HISTORY     - Date     Condition        Report By
 HV2148  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2148  HISTORY     - 1960     GOOD             MADHOP
 HV2148  HISTORY     - 20101030 MARK NOT FOUND   GEOCAC
 HV2148
 HV2148                          STATION DESCRIPTION
 HV2148
 HV2148'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2148'IN WASHINGTON DC.
 HV2148'AT THE INTERSECTION OF ALBEMARLE ST. N.W. AND RENO RD. N.W.
 HV2148'ON THE SOUTHEAST CORNER OF THE INTERSECTION.  A RAMSET NAIL 0.5
 HV2148'E. P.C. CURB. (IN TOP OF CURB).
 HV2148
 HV2148                          STATION RECOVERY (2010)
 HV2148
 HV2148'RECOVERY NOTE BY GEOCACHING 2010 (RLM)
 HV2148'CURB CUTS HAVE BEEN INSTALLED AT THE LOCATION DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2154 ***********************************************************************
 HV2154  DESIGNATION -  DTP 8 MADHOP
 HV2154  PID         -  HV2154
 HV2154  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2154  COUNTRY     -  US
 HV2154  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2154
 HV2154                         *CURRENT SURVEY CONTROL
 HV2154  ______________________________________________________________________
 HV2154* NAD 83(1986) POSITION- 38 55 54.     (N) 077 03 23.     (W)   SCALED
 HV2154* NAVD 88 ORTHO HEIGHT -    64.298 (meters)      210.95  (feet) ADJUSTED
 HV2154  ______________________________________________________________________
 HV2154  GEOID HEIGHT    -        -31.991 (meters)                     GEOID18
 HV2154  DYNAMIC HEIGHT  -         64.263 (meters)      210.84  (feet) COMP
 HV2154  MODELED GRAVITY -    980,088.2   (mgal)                       NAVD 88
 HV2154
 HV2154  VERT ORDER      -  SECOND    CLASS 0
 HV2154
 HV2154.The horizontal coordinates were scaled from a map and have
 HV2154.an estimated accuracy of +/- 6 seconds.
 HV2154
 HV2154.The orthometric height was determined by differential leveling and
 HV2154.adjusted by the NATIONAL GEODETIC SURVEY
 HV2154.in June 1991.
 HV2154
 HV2154.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2154.GEOID18 height accuracy estimate available here.
 HV2154
 HV2154.Click photographs - Photos may exist for this station.
 HV2154
 HV2154.The dynamic height is computed by dividing the NAVD 88
 HV2154.geopotential number by the normal gravity value computed on the
 HV2154.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2154.degrees latitude (g = 980.6199 gals.).
 HV2154
 HV2154.The modeled gravity was interpolated from observed gravity values.
 HV2154
 HV2154
 HV2154_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ217112(NAD 83)
 HV2154
 HV2154                          SUPERSEDED SURVEY CONTROL
 HV2154
 HV2154  NGVD 29 (11/26/84)   64.525  (m)          211.70   (f) ADJUSTED    2 0
 HV2154
 HV2154.Superseded values are not recommended for survey control.
 HV2154
 HV2154.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2154.See file dsdata.pdf to determine how the superseded data were derived.
 HV2154
 HV2154_MARKER: N = NAIL
 HV2154_SETTING: 0 = UNSPECIFIED SETTING
 HV2154_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2154
 HV2154  HISTORY     - Date     Condition        Report By
 HV2154  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2154  HISTORY     - 1960     GOOD             MADHOP
 HV2154
 HV2154                          STATION DESCRIPTION
 HV2154
 HV2154'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2154'IN WASHINGTON DC.
 HV2154'LOCATED ON CONNECTICUT AVE. N.W. BETWEEN INTERSECTION OF CONN.
 HV2154'AVE. AND KLINGLE RD. N.W., AND CONN. AVE AND DEVONSHIRE PL.
 HV2154'N.W. 0.25 FT SOUTHWEST OF CURB FACE, ON WEST SIDE OF CONNECTICUT
 HV2154'AVE.  A RAMSET NAIL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2155 ***********************************************************************
 HV2155  DESIGNATION -  DTP 9 MADHOP
 HV2155  PID         -  HV2155
 HV2155  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2155  COUNTRY     -  US
 HV2155  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2155
 HV2155                         *CURRENT SURVEY CONTROL
 HV2155  ______________________________________________________________________
 HV2155* NAD 83(1986) POSITION- 38 55 48.     (N) 077 03 43.     (W)   SCALED
 HV2155* NAVD 88 ORTHO HEIGHT -    84.535 (meters)      277.35  (feet) ADJUSTED
 HV2155  ______________________________________________________________________
 HV2155  GEOID HEIGHT    -        -31.984 (meters)                     GEOID18
 HV2155  DYNAMIC HEIGHT  -         84.490 (meters)      277.20  (feet) COMP
 HV2155  MODELED GRAVITY -    980,087.1   (mgal)                       NAVD 88
 HV2155
 HV2155  VERT ORDER      -  SECOND    CLASS 0
 HV2155
 HV2155.The horizontal coordinates were scaled from a map and have
 HV2155.an estimated accuracy of +/- 6 seconds.
 HV2155
 HV2155.The orthometric height was determined by differential leveling and
 HV2155.adjusted by the NATIONAL GEODETIC SURVEY
 HV2155.in June 1991.
 HV2155
 HV2155.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2155.GEOID18 height accuracy estimate available here.
 HV2155
 HV2155.Click photographs - Photos may exist for this station.
 HV2155
 HV2155.The dynamic height is computed by dividing the NAVD 88
 HV2155.geopotential number by the normal gravity value computed on the
 HV2155.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2155.degrees latitude (g = 980.6199 gals.).
 HV2155
 HV2155.The modeled gravity was interpolated from observed gravity values.
 HV2155
 HV2155
 HV2155_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ212110(NAD 83)
 HV2155
 HV2155                          SUPERSEDED SURVEY CONTROL
 HV2155
 HV2155  NGVD 29 (11/26/84)   84.762  (m)          278.09   (f) ADJUSTED    2 0
 HV2155
 HV2155.Superseded values are not recommended for survey control.
 HV2155
 HV2155.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2155.See file dsdata.pdf to determine how the superseded data were derived.
 HV2155
 HV2155_MARKER: N = NAIL
 HV2155_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2155_SP_SET: CURB
 HV2155_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2155
 HV2155  HISTORY     - Date     Condition        Report By
 HV2155  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2155  HISTORY     - 1960     GOOD             MADHOP
 HV2155
 HV2155                          STATION DESCRIPTION
 HV2155
 HV2155'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2155'IN WASHINGTON DC.
 HV2155'LOCATED ON KLINGLE RD. N.W. IN FRONT OF BUILDING 3124 AND WOOLEY RD.
 HV2155'KLINGLE RD. INTERSECTION. 7.0 FT WEST OF THE CON. WALK PERPENDICULAR
 HV2155'TO KLINGLE RD IN FRONT OF BUILDING 3124.  A RAMSET NAIL SET IN
 HV2155'THE SOUTH SIDE OF KLINGLE RD. RAMSET NAIL IN CURB.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7581 ***********************************************************************
 HV7581  DESIGNATION -  DUPONT
 HV7581  PID         -  HV7581
 HV7581  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7581  COUNTRY     -  US
 HV7581  USGS QUAD   -  ANACOSTIA (2016)
 HV7581
 HV7581                         *CURRENT SURVEY CONTROL
 HV7581  ______________________________________________________________________
 HV7581* NAD 83(1993) POSITION- 38 52 21.25241(N) 076 56 24.99202(W)   ADJUSTED
 HV7581* NAVD 88 ORTHO HEIGHT -    93.    (meters)      305.    (feet) SCALED
 HV7581  ______________________________________________________________________
 HV7581  GEOID HEIGHT    -        -32.283 (meters)                     GEOID18
 HV7581  LAPLACE CORR    -         -4.26  (seconds)                    DEFLEC18
 HV7581  HORZ ORDER      -  FIRST
 HV7581
 HV7581.The horizontal coordinates were established by classical geodetic methods
 HV7581.and adjusted by the National Geodetic Survey in November 1994.
 HV7581
 HV7581.The orthometric height was scaled from a topographic map.
 HV7581
 HV7581.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7581.GEOID18 height accuracy estimate available here.
 HV7581
 HV7581.Click photographs - Photos may exist for this station.
 HV7581
 HV7581.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7581
 HV7581. The following values were computed from the NAD 83(1993) position.
 HV7581
 HV7581;                    North         East     Units Scale Factor Converg.
 HV7581;SPC MD       -   133,862.067   405,182.720   MT  0.99994985   +0 02 14.9
 HV7581;SPC MD       -   439,179.13  1,329,336.97   sFT  0.99994985   +0 02 14.9
 HV7581;SPC VA N     - 2,135,004.962 3,635,343.178   MT  0.99995827   +0 58 24.4
 HV7581;SPC VA N     - 7,004,595.45 11,926,955.08   sFT  0.99995827   +0 58 24.4
 HV7581;UTM  18      - 4,304,424.724   331,680.285   MT  0.99994888   -1 13 04.7
 HV7581
 HV7581!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7581!SPC MD       -   0.99999051  x   0.99994985  =   0.99994036
 HV7581!SPC VA N     -   0.99999051  x   0.99995827  =   0.99994878
 HV7581!UTM  18      -   0.99999051  x   0.99994888  =   0.99993939
 HV7581
 HV7581:                Primary Azimuth Mark                     Grid Az
 HV7581:SPC MD       -  ALEXANDRIA WASH MASON MEMORIAL           236 29 24.3
 HV7581:SPC VA N     -  ALEXANDRIA WASH MASON MEMORIAL           235 33 14.8
 HV7581:UTM  18      -  ALEXANDRIA WASH MASON MEMORIAL           237 44 43.9
 HV7581
 HV7581_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3168004424(NAD 83)
 HV7581
 HV7581|---------------------------------------------------------------------|
 HV7581| PID    Reference Object                     Distance      Geod. Az  |
 HV7581|                                                           dddmmss.s |
 HV7581| CX2720 DUPONT RM 1                          40.170 METERS 04942     |
 HV7581| HV7616 BRADBURY HEIGHTS WSSD TANK          337.840 METERS 13707     |
 HV7581| HV4631 ALEXANDRIA WASH MASON MEMORIAL      APPROX.13.1 KM 2363139.2 |
 HV7581| HV7585 STANTON SCHOOL STANDPIPE            APPROX. 3.0 KM 2393013.5 |
 HV7581| HV4726 ST ELIZABETHS ASYLUM RED STK        APPROX. 5.7 KM 2461852.7 |
 HV7581| HV4724 ST ELIZABETHS ASYLUM WHITE STK      APPROX. 5.6 KM 2462338.7 |
 HV7581| CX2721 DUPONT RM 2                          39.082 METERS 32906     |
 HV7581|---------------------------------------------------------------------|
 HV7581
 HV7581                          SUPERSEDED SURVEY CONTROL
 HV7581
 HV7581  NAD 83(1991)-  38 52 21.25105(N)    076 56 24.99241(W) AD(       ) 1
 HV7581  NAD 83(1986)-  38 52 21.25034(N)    076 56 25.00386(W) AD(       ) 1
 HV7581  NAD 27      -  38 52 20.85000(N)    076 56 26.09300(W) AD(       ) 1
 HV7581  USSD        -  38 52 21.18300(N)    076 56 25.92300(W) AD(       ) 3
 HV7581
 HV7581.Superseded values are not recommended for survey control.
 HV7581
 HV7581.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7581.See file dsdata.pdf to determine how the superseded data were derived.
 HV7581
 HV7581_MARKER: DD = SURVEY DISK
 HV7581_SETTING: 0 = UNSPECIFIED SETTING
 HV7581_MARK LOGO: PBPP
 HV7581
 HV7581  HISTORY     - Date     Condition        Report By
 HV7581  HISTORY     - 1880     MONUMENTED       CGS
 HV7581  HISTORY     - 1912     GOOD             CGS
 HV7581  HISTORY     - 1934     GOOD             CGS
 HV7581  HISTORY     - 1938     GOOD             CGS
 HV7581  HISTORY     - 1943     GOOD             CGS
 HV7581  HISTORY     - 1959     GOOD             CGS
 HV7581  HISTORY     - 1960     GOOD             MADHOP
 HV7581  HISTORY     - 1971     GOOD             NGS
 HV7581
 HV7581                          STATION DESCRIPTION
 HV7581
 HV7581'DESCRIBED BY COAST AND GEODETIC SURVEY 1880 (CHS)
 HV7581'STATION IS ACROSS THE EASTERN BRANCH NOT FAR FROM THE HOUSE
 HV7581'OF SILAS J. BOWEN, ON THE ROAD TO MARLBOROUGH, MARYLAND.  CROSS
 HV7581'OVER THE UNIONTOWN BRIDGE AND TAKE THE LEFT-HAND ROAD.  BEARINGS
 HV7581'AND DISTANCES WERE TAKEN TO 4 TREES, TWO SMALL PINES, A CEDAR
 HV7581'AND APPLE TREE.  STATION IS MARKED BY STUB AND COPPER TACKS.
 HV7581'
 HV7581'STATION IS ON A GUN SUPPORT, NEAR THE S SIDE OF THE FORT AND
 HV7581'CLOSE TO THE EMBANKMENT, APRIL 28, 1884.  MARKED POINTS WITH
 HV7581'EARTHEN ALE BOTTLE 3 FEET UNDERGROUND, BOTTOM, AND SURFACE
 HV7581'MARK, A GRANITE BLOCK 2 FEET BY 6 BY 6 INCHES, 1/4-INCH
 HV7581'HOLE IN CENTER.
 HV7581
 HV7581                          STATION RECOVERY (1912)
 HV7581
 HV7581'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1912
 HV7581'STATION RECOVERED AFTER CONSIDERABLE HUNTING AND DIGGING
 HV7581'AS THE OLD FORT IS A THICKET.  THE CEDAR TREE ON THE INTERIOR
 HV7581'BANK IS THE ONLY ONE OF THE TREES YOU COULD FIND, DID NOT
 HV7581'DISTURB SURFACE MARK.
 HV7581
 HV7581                          STATION RECOVERY (1934)
 HV7581
 HV7581'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1934 (JB)
 HV7581'THIS STATION IS ON THE SITE OF THE OLD FORT DUPONT NEAR THE
 HV7581'SE BOUNDARY OF THE DISTRICT OF COLUMBIA, ON THE ROAD TO
 HV7581'MARLBOROUGH, MARYLAND.  IT IS INSIDE OF THE FORT ON A GUN
 HV7581'SUPPORT, NEAR THE S SIDE OF THE FORT, AND CLOSE TO THE EMBANKMENT
 HV7581'ABOUT 30 FEET N OF THE S REDOUBT BANK, ABOUT 150 FEET NE OF A
 HV7581'WHITEWASHED GARAGE.  TWO TREES NEAR THE STATION HAVE TRIANGLES
 HV7581'BLAZED ON THEM, ONE A CEDAR, 5-INCHES IN DIAMETER IS 11.8
 HV7581'FEET NE OF THE STATION, THE OTHER AN 8-INCH LOCUST IS 13.2
 HV7581'FEET SE OF THE STATION.  THERE ARE TWO 6-INCH SQUARE STONES
 HV7581'WITH NAILS CEMENTED IN THE TOP, ONE IS S OF THE STATION
 HV7581'3.191 METERS, THE OTHER IS E OF THE STATION 3.675 METERS.
 HV7581'THEY ARE TOO CLOSE TO THE MARK TO SEE WITH THE INSTRUMENT.
 HV7581'THE STATION IS MARKED WITH A P.B. AND P.P. TRIANGULATION
 HV7581'MARK CEMENTED IN THE TOP OF A 6-INCH SQUARE STONE.  THE
 HV7581'STONE IS FLUSH WITH THE SURFACE OF THE GROUND.
 HV7581'
 HV7581'TWO NEW REFERENCE MARKS WERE SET, THEY WERE STAMPED DUPONT 1934.
 HV7581'THEY ARE STANDARD BRONZE DISKS SET IN CONCRETE.
 HV7581'REFERENCE MARK NO. 1 IS 40.170 METERS NE OF
 HV7581'THE STATION, AT THE NE SIDE OF THE FORT, 9 METERS E OF A TWIN
 HV7581'TREE (ONE TREE 30 INCHES IN DIAMETER, THE OTHER 10 INCHES
 HV7581'IN DIAMETER).
 HV7581'
 HV7581'REFERENCE MARK NO. 2 IS 39.082 METERS N OF THE STATION, ON
 HV7581'THE N SIDE OF THE FORT, 12 METERS SSW OF THE E END OF A SMALL
 HV7581'FOOT BRIDGE.
 HV7581'
 HV7581'STATION TRAINING CAN BE USED AS AN AZIMUTH MARK.
 HV7581
 HV7581                          STATION RECOVERY (1938)
 HV7581
 HV7581'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV7581'STATION RECOVERED.
 HV7581'
 HV7581'REFERENCE MARKS NOT SEARCHED FOR.
 HV7581
 HV7581                          STATION RECOVERY (1943)
 HV7581
 HV7581'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943 (RLS)
 HV7581'RECOVERED AS DESCRIBED.  DESCRIPTION ADEQUATE AND COMPLETE
 HV7581'EXCEPT FOR THE FOLLOWING DISCREPANCIES--
 HV7581'
 HV7581'(1) DELETE PHRASE TWO TREES NEAR STATION HAVE TRIANGLES BLAZED
 HV7581'ON THEM, ONE A CEDAR, 5 INCHES IN DIAMETER, IS 11.8 FEET NE
 HV7581'OF STATION.
 HV7581'
 HV7581'(2) WITH REFERENCE TO R.M. 2, DELETE PHRASE 12 METERS SSW
 HV7581'OF THE E END OF A SMALL FOOT BRIDGE, AND INSERT INSTEAD THE
 HV7581'PHRASE 12 METERS SSE OF EAST END OF FILL ACROSS MOAT.
 HV7581
 HV7581                          STATION RECOVERY (1959)
 HV7581
 HV7581'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (JJK)
 HV7581'STATION RECOVERED.  GARAGE MENTIONED IN DESCRIPTION IS GONE, SO
 HV7581'ARE THE TREES.  R.M. IS 3.191 METERS NORTH OF STATION NOT SOUTH.
 HV7581
 HV7581                          STATION RECOVERY (1960)
 HV7581
 HV7581'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7581'STATION RECOVERED AS DESCRIBED.
 HV7581'
 HV7581'REFERENCE MARKS NOT SEARCHED FOR.
 HV7581
 HV7581                          STATION RECOVERY (1971)
 HV7581
 HV7581'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7581'THE STATION WAS RECOVERED AS DESCRIBED IN THE 1934 DESCRIPTION
 HV7581'AND FOUND TO BE IN GOOD CONDITION.  THE GARAGE AND TWO TREES
 HV7581'NEAR THE STATION WITH TRIANGULAR BLAZES NO LONGER EXISTS,
 HV7581'OTHERWISE THE DESCRIPTION IS ADEQUATE.  THE REFERENCE MARKS
 HV7581'ESTABLISHED IN 1934 WERE RECOVERED IN GOOD CONDITION.  REFERENCE
 HV7581'MARKS NO. 1 IS FLUSH WITH GROUND AND AT FOOT OF WEST SLOPE
 HV7581'OF BANK, AND 9 METERS EAST OF A TWIN TREE.  REFERENCE MARK
 HV7581'NO. 2 RECOVERED IN GOOD CONDITION, SET FLUSH WITH THE GROUND.
 HV7581'THE BRIDGE MENTIONED IN THE 1934 DESCRIPTION, NO LONGER
 HV7581'EXISTS.  THE MARK IS 10 FEET NORTH OF THE NORTH EDGE OF A
 HV7581'DEEP HOLE IN GROUND AND 9 FEET EAST OF THE TOP OF
 HV7581'EMBANKMENT.  NO AZIMUTH MARK GIVEN FOR THIS STATION.
 HV7581'
 HV7581'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--DIST. OF
 HV7581'COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4283 ***********************************************************************
 HV4283  DESIGNATION -  DUPONT A 1960
 HV4283  PID         -  HV4283
 HV4283  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4283  COUNTRY     -  US
 HV4283  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4283
 HV4283                         *CURRENT SURVEY CONTROL
 HV4283  ______________________________________________________________________
 HV4283* NAD 83(1993) POSITION- 38 54 22.22884(N) 077 02 48.19794(W)   ADJUSTED
 HV4283* NAVD 88 ORTHO HEIGHT -    20.    (meters)       66.    (feet) SCALED
 HV4283  ______________________________________________________________________
 HV4283  GEOID HEIGHT    -        -32.042 (meters)                     GEOID18
 HV4283  LAPLACE CORR    -         -2.13  (seconds)                    DEFLEC18
 HV4283  HORZ ORDER      -  SECOND
 HV4283
 HV4283.The horizontal coordinates were established by classical geodetic methods
 HV4283.and adjusted by the National Geodetic Survey in November 1994.
 HV4283
 HV4283.The orthometric height was scaled from a topographic map.
 HV4283
 HV4283.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4283.GEOID18 height accuracy estimate available here.
 HV4283
 HV4283.Click photographs - Photos may exist for this station.
 HV4283
 HV4283.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4283
 HV4283. The following values were computed from the NAD 83(1993) position.
 HV4283
 HV4283;                    North         East     Units Scale Factor Converg.
 HV4283;SPC MD       -   137,591.778   395,947.534   MT  0.99994999   -0 01 45.6
 HV4283;SPC MD       -   451,415.69  1,299,037.87   sFT  0.99994999   -0 01 45.6
 HV4283;SPC VA N     - 2,138,583.323 3,626,048.198   MT  0.99996104   +0 54 25.3
 HV4283;SPC VA N     - 7,016,335.45 11,896,459.80   sFT  0.99996104   +0 54 25.3
 HV4283;UTM  18      - 4,308,356.034   322,528.901   MT  0.99998785   -1 17 08.8
 HV4283
 HV4283!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4283!SPC MD       -   1.00000193  x   0.99994999  =   0.99995192
 HV4283!SPC VA N     -   1.00000193  x   0.99996104  =   0.99996297
 HV4283!UTM  18      -   1.00000193  x   0.99998785  =   0.99998978
 HV4283
 HV4283:                Primary Azimuth Mark                     Grid Az
 HV4283:SPC MD       -  N W 119 A 1960                           036 39 13.4
 HV4283:SPC VA N     -  N W 119 A 1960                           035 43 02.5
 HV4283:UTM  18      -  N W 119 A 1960                           037 54 36.6
 HV4283
 HV4283_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2252808356(NAD 83)
 HV4283
 HV4283|---------------------------------------------------------------------|
 HV4283| PID    Reference Object                     Distance      Geod. Az  |
 HV4283|                                                           dddmmss.s |
 HV4283| HV4258 N W 119 A 1960                      472.952 METERS 0363727.8 |
 HV4283| HV2163 NW 120 DCDHT                        APPROX. 0.5 KM 2162202.0 |
 HV4283|---------------------------------------------------------------------|
 HV4283
 HV4283                          SUPERSEDED SURVEY CONTROL
 HV4283
 HV4283  NAD 83(1991)-  38 54 22.22777(N)    077 02 48.19932(W) AD(       ) 2
 HV4283  NAD 83(1986)-  38 54 22.22740(N)    077 02 48.20981(W) AD(       ) 2
 HV4283  NAD 27      -  38 54 21.82570(N)    077 02 49.29040(W) AD(       ) 2
 HV4283
 HV4283.Superseded values are not recommended for survey control.
 HV4283
 HV4283.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4283.See file dsdata.pdf to determine how the superseded data were derived.
 HV4283
 HV4283_MARKER: N = NAIL
 HV4283_SETTING: 0 = UNSPECIFIED SETTING
 HV4283_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4283
 HV4283  HISTORY     - Date     Condition        Report By
 HV4283  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4283  HISTORY     - 1971     GOOD             NGS
 HV4283
 HV4283                          STATION DESCRIPTION
 HV4283
 HV4283'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4283'STATION RECOVERED AS DESCRIBED.  THE STATION, A P.K. NAIL IS
 HV4283'PLAINLY VISIBLE AND HAS ABOUT 3/8 INCH HEAD.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1863 ***********************************************************************
 HV1863  DESIGNATION -  E 1
 HV1863  PID         -  HV1863
 HV1863  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1863  COUNTRY     -  US
 HV1863  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1863
 HV1863                         *CURRENT SURVEY CONTROL
 HV1863  ______________________________________________________________________
 HV1863* NAD 83(1986) POSITION- 38 53 51.     (N) 077 03 14.     (W)   SCALED
 HV1863* NAVD 88 ORTHO HEIGHT -     6.832 (meters)       22.41  (feet) ADJUSTED
 HV1863  ______________________________________________________________________
 HV1863  GEOID HEIGHT    -        -32.050 (meters)                     GEOID18
 HV1863  DYNAMIC HEIGHT  -          6.828 (meters)       22.40  (feet) COMP
 HV1863  MODELED GRAVITY -    980,094.8   (mgal)                       NAVD 88
 HV1863
 HV1863  VERT ORDER      -  FIRST     CLASS II
 HV1863
 HV1863.The horizontal coordinates were scaled from a map and have
 HV1863.an estimated accuracy of +/- 6 seconds.
 HV1863
 HV1863.The orthometric height was determined by differential leveling and
 HV1863.adjusted by the NATIONAL GEODETIC SURVEY
 HV1863.in June 1991.
 HV1863
 HV1863.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1863.GEOID18 height accuracy estimate available here.
 HV1863
 HV1863.Click photographs - Photos may exist for this station.
 HV1863
 HV1863.The dynamic height is computed by dividing the NAVD 88
 HV1863.geopotential number by the normal gravity value computed on the
 HV1863.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1863.degrees latitude (g = 980.6199 gals.).
 HV1863
 HV1863.The modeled gravity was interpolated from observed gravity values.
 HV1863
 HV1863
 HV1863_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ218074(NAD 83)
 HV1863
 HV1863                          SUPERSEDED SURVEY CONTROL
 HV1863
 HV1863  NGVD 29 (11/26/84)    7.061  (m)           23.17   (f) ADJUSTED    1 2
 HV1863
 HV1863.Superseded values are not recommended for survey control.
 HV1863
 HV1863.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1863.See file dsdata.pdf to determine how the superseded data were derived.
 HV1863
 HV1863_MARKER: DB = BENCH MARK DISK
 HV1863_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1863_SP_SET: BUILDING
 HV1863_STAMPING: E 1 1914
 HV1863_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1863
 HV1863  HISTORY     - Date     Condition        Report By
 HV1863  HISTORY     - 1914     MONUMENTED       CGS
 HV1863  HISTORY     - 1914     GOOD             CGS
 HV1863  HISTORY     - 1948     GOOD             CGS
 HV1863
 HV1863                          STATION DESCRIPTION
 HV1863
 HV1863'DESCRIBED BY COAST AND GEODETIC SURVEY 1914
 HV1863'AT WASHINGTON.
 HV1863'AT WASHINGTON, ON THE NORTH SIDE OF WATER STREET NORTHWEST
 HV1863'BETWEEN TWENTY-FIFTH AND TWENTY-SIXTH STREETS, AT THE OLD HEURICH
 HV1863'BREWERY (TO BE TORN DOWN), IN THE SOUTH WALL, 15 FEET WEST OF
 HV1863'THE ENTRANCE TO THE OFFICE, AND ABOUT 2 FEET ABOVE THE GROUND.  A
 HV1863'STANDARD DISK, STAMPED E 1 1914 AND SET VERTICALLY.
 HV1863
 HV1863                          STATION RECOVERY (1948)
 HV1863
 HV1863'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1948
 HV1863'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4211 ***********************************************************************
 HV4211  DESIGNATION -  E 1913
 HV4211  PID         -  HV4211
 HV4211  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4211  COUNTRY     -  US
 HV4211  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4211
 HV4211                         *CURRENT SURVEY CONTROL
 HV4211  ______________________________________________________________________
 HV4211* NAD 83(1993) POSITION- 38 53 09.47406(N) 077 02 57.88172(W)   ADJUSTED
 HV4211* NAVD 88 ORTHO HEIGHT -     3.    (meters)       10.    (feet) SCALED
 HV4211  ______________________________________________________________________
 HV4211  GEOID HEIGHT    -        -32.077 (meters)                     GEOID18
 HV4211  LAPLACE CORR    -         -2.58  (seconds)                    DEFLEC18
 HV4211  HORZ ORDER      -  THIRD
 HV4211
 HV4211.The horizontal coordinates were established by classical geodetic methods
 HV4211.and adjusted by the National Geodetic Survey in November 1994.
 HV4211
 HV4211.The orthometric height was scaled from a topographic map.
 HV4211
 HV4211.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4211.GEOID18 height accuracy estimate available here.
 HV4211
 HV4211.Click photographs - Photos may exist for this station.
 HV4211
 HV4211.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4211
 HV4211. The following values were computed from the NAD 83(1993) position.
 HV4211
 HV4211;                    North         East     Units Scale Factor Converg.
 HV4211;SPC MD       -   135,348.468   395,713.005   MT  0.99994986   -0 01 51.6
 HV4211;SPC MD       -   444,055.77  1,298,268.42   sFT  0.99994986   -0 01 51.6
 HV4211;SPC VA N     - 2,136,336.457 3,625,850.356   MT  0.99995933   +0 54 19.2
 HV4211;SPC VA N     - 7,008,963.86 11,895,810.71   sFT  0.99995933   +0 54 19.2
 HV4211;UTM  18      - 4,306,118.319   322,245.238   MT  0.99998909   -1 17 12.8
 HV4211
 HV4211!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4211!SPC MD       -   1.00000460  x   0.99994986  =   0.99995446
 HV4211!SPC VA N     -   1.00000460  x   0.99995933  =   0.99996393
 HV4211!UTM  18      -   1.00000460  x   0.99998909  =   0.99999369
 HV4211
 HV4211_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2224506118(NAD 83)
 HV4211
 HV4211|---------------------------------------------------------------------|
 HV4211| PID    Reference Object                     Distance      Geod. Az  |
 HV4211|                                                           dddmmss.s |
 HV4211| HV4279 F B 1913                            312.108 METERS 13910     |
 HV4211| HV4285 D 1913                              356.184 METERS 32333     |
 HV4211|---------------------------------------------------------------------|
 HV4211
 HV4211                          SUPERSEDED SURVEY CONTROL
 HV4211
 HV4211  NAD 83(1991)-  38 53 09.47279(N)    077 02 57.88323(W) AD(       ) 3
 HV4211  NAD 83(1986)-  38 53 09.47253(N)    077 02 57.89383(W) AD(       ) 3
 HV4211  NAD 27      -  38 53 09.07300(N)    077 02 58.97100(W) AD(       ) 3
 HV4211  USSD        -  38 53 09.41100(N)    077 02 58.80200(W) AD(       ) 3
 HV4211
 HV4211.Superseded values are not recommended for survey control.
 HV4211
 HV4211.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4211.See file dsdata.pdf to determine how the superseded data were derived.
 HV4211
 HV4211_MARKER: I = METAL ROD
 HV4211_SETTING: 17 = SET INTO TOP OF METAL PIPE DRIVEN INTO GROUND
 HV4211_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4211
 HV4211  HISTORY     - Date     Condition        Report By
 HV4211  HISTORY     - 1913     MONUMENTED       CGS
 HV4211  HISTORY     - 1940     MARK NOT FOUND   CGS
 HV4211
 HV4211                          STATION DESCRIPTION
 HV4211
 HV4211'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4211'STATION IS IN CONCRETE MONUMENT 8-INCH CAST-IRON PIPE, CENTERED
 HV4211'WITH 1/4-INCH BRASS ROD, 0.3 FOOT ABOVE GROUND, ABOUT 6 FEET
 HV4211'ABOVE MEAN LOW WATER, 5.95 FEET E OF EDGE OF WALL, 36 FEET
 HV4211'S OF 38-INCH WILLOW TREE, AND 91 FEET N OF 35-INCH WILLOW
 HV4211'TREE.
 HV4211
 HV4211                          STATION RECOVERY (1940)
 HV4211
 HV4211'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV4211'STATION LOST BY RECONSTRUCTION OF SEA WALL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1227 ***********************************************************************
 HV1227  DESIGNATION -  E 3
 HV1227  PID         -  HV1227
 HV1227  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1227  COUNTRY     -  US
 HV1227  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1227
 HV1227                         *CURRENT SURVEY CONTROL
 HV1227  ______________________________________________________________________
 HV1227* NAD 83(1986) POSITION- 38 53 13.     (N) 076 58 33.     (W)   SCALED
 HV1227* NAVD 88 ORTHO HEIGHT -    12.804 (meters)       42.01  (feet) ADJUSTED
 HV1227  ______________________________________________________________________
 HV1227  GEOID HEIGHT    -        -32.195 (meters)                     GEOID18
 HV1227  DYNAMIC HEIGHT  -         12.797 (meters)       41.98  (feet) COMP
 HV1227  MODELED GRAVITY -    980,096.5   (mgal)                       NAVD 88
 HV1227
 HV1227  VERT ORDER      -  FIRST     CLASS II
 HV1227
 HV1227.The horizontal coordinates were scaled from a map and have
 HV1227.an estimated accuracy of +/- 6 seconds.
 HV1227
 HV1227.The orthometric height was determined by differential leveling and
 HV1227.adjusted by the NATIONAL GEODETIC SURVEY
 HV1227.in June 1991.
 HV1227
 HV1227.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1227.GEOID18 height accuracy estimate available here.
 HV1227
 HV1227.Click photographs - Photos may exist for this station.
 HV1227
 HV1227.The dynamic height is computed by dividing the NAVD 88
 HV1227.geopotential number by the normal gravity value computed on the
 HV1227.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1227.degrees latitude (g = 980.6199 gals.).
 HV1227
 HV1227.The modeled gravity was interpolated from observed gravity values.
 HV1227
 HV1227
 HV1227_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ286060(NAD 83)
 HV1227
 HV1227                          SUPERSEDED SURVEY CONTROL
 HV1227
 HV1227  NGVD 29 (11/26/84)   13.036  (m)           42.77   (f) ADJUSTED    1 2
 HV1227
 HV1227.Superseded values are not recommended for survey control.
 HV1227
 HV1227.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1227.See file dsdata.pdf to determine how the superseded data were derived.
 HV1227
 HV1227_MARKER: DB = BENCH MARK DISK
 HV1227_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1227_SP_SET: PARAPET
 HV1227_STAMPING: E 3 1954
 HV1227_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1227
 HV1227  HISTORY     - Date     Condition        Report By
 HV1227  HISTORY     - 1954     MONUMENTED       CGS
 HV1227
 HV1227                          STATION DESCRIPTION
 HV1227
 HV1227'DESCRIBED BY COAST AND GEODETIC SURVEY 1954
 HV1227'AT WASHINGTON.
 HV1227'AT WASHINGTON, ON INDEPENDENCE AVENUE SOUTHEAST, AT THE D.C.
 HV1227'GENERAL HOSPITAL, AT THE MAIN NORTH ENTRANCE TO THE CHILDRENS
 HV1227'BUILDING, IN THE TOP OF THE EAST PARAPET OF THE STEPS,
 HV1227'6 INCHES WEST OF THE EAST EDGE OF THE WALL, AND 6 INCHES
 HV1227'NORTH OF THE NORTH FACE OF THE BUILDING.  A STANDARD DISK,
 HV1227'STAMPED E 3 1954.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV0870 ***********************************************************************
 HV0870  DESIGNATION -  E 5
 HV0870  PID         -  HV0870
 HV0870  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV0870  COUNTRY     -  US
 HV0870  USGS QUAD   -  WASHINGTON EAST (2016)
 HV0870
 HV0870                         *CURRENT SURVEY CONTROL
 HV0870  ______________________________________________________________________
 HV0870* NAD 83(1986) POSITION- 38 53 05.     (N) 076 59 46.     (W)   SCALED
 HV0870* NAVD 88 ORTHO HEIGHT -    24.682 (meters)       80.98  (feet) ADJUSTED
 HV0870  ______________________________________________________________________
 HV0870  GEOID HEIGHT    -        -32.160 (meters)                     GEOID18
 HV0870  DYNAMIC HEIGHT  -         24.669 (meters)       80.93  (feet) COMP
 HV0870  MODELED GRAVITY -    980,099.4   (mgal)                       NAVD 88
 HV0870
 HV0870  VERT ORDER      -  FIRST     CLASS I
 HV0870
 HV0870.The horizontal coordinates were scaled from a map and have
 HV0870.an estimated accuracy of +/- 6 seconds.
 HV0870
 HV0870.The orthometric height was determined by differential leveling and
 HV0870.adjusted by the NATIONAL GEODETIC SURVEY
 HV0870.in June 1991.
 HV0870
 HV0870.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV0870.GEOID18 height accuracy estimate available here.
 HV0870
 HV0870.Click photographs - Photos may exist for this station.
 HV0870
 HV0870.The dynamic height is computed by dividing the NAVD 88
 HV0870.geopotential number by the normal gravity value computed on the
 HV0870.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV0870.degrees latitude (g = 980.6199 gals.).
 HV0870
 HV0870.The modeled gravity was interpolated from observed gravity values.
 HV0870
 HV0870
 HV0870_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ268058(NAD 83)
 HV0870
 HV0870                          SUPERSEDED SURVEY CONTROL
 HV0870
 HV0870  NGVD 29 (11/26/84)   24.920  (m)           81.76   (f) ADJUSTED    1 1
 HV0870
 HV0870.Superseded values are not recommended for survey control.
 HV0870
 HV0870.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV0870.See file dsdata.pdf to determine how the superseded data were derived.
 HV0870
 HV0870_MARKER: DB = BENCH MARK DISK
 HV0870_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV0870_SP_SET: CONC AIR VENT
 HV0870_STAMPING: E 5 1971
 HV0870_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV0870
 HV0870  HISTORY     - Date     Condition        Report By
 HV0870  HISTORY     - 1971     MONUMENTED       NGS
 HV0870  HISTORY     - 20020814 GOOD             INDIV
 HV0870
 HV0870                          STATION DESCRIPTION
 HV0870
 HV0870'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV0870'AT WASHINGTON.
 HV0870'AT WASHINGTON, D.C., ABOUT 0.45 MILE SOUTHEAST ALONG PENNSYLVANIA
 HV0870'AVENUE FROM THE JUNCTION OF INDEPENDENCE AVENUE SE, AT THE
 HV0870'NORTHEAST ANGLE OF THE INTERSECTION OF PENNSYLVANIA AVENUE AND
 HV0870'SE 7TH STREET, SET IN THE TOP OF THE SOUTHWEST CORNER OF A
 HV0870'7- X 2 1/2- X 5-FOOT CONCRETE AIR VENT IN THE LAWN OF THE HINE
 HV0870'JUNIOR HIGH SCHOOL, 159 FEET NORTH ALONG SE 7TH STREET FROM
 HV0870'THE NORTHEAST CURB OF THE NORTHEAST LANES OF PENNSYLVANIA
 HV0870'AVENUE, 31.4 FEET SOUTH OF THE NORTHWEST CORNER OF THE 4-STORY
 HV0870'BRICK SCHOOL BUILDING, 27.2 FEET EAST OF THE EAST CURB OF THE
 HV0870'STREET, ABOUT 1/2 FOOT ABOVE THE SURFACE OF THE GROUND, AND ABOUT
 HV0870'1 FOOT ABOVE THE LEVEL OF THE STREET.
 HV0870
 HV0870                          STATION RECOVERY (2002)
 HV0870
 HV0870'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 HV0870'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4656 ***********************************************************************
 HV4656  DESIGNATION -  E P P 5 PB AND PP 1934
 HV4656  PID         -  HV4656
 HV4656  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4656  COUNTRY     -  US
 HV4656  USGS QUAD   -  ALEXANDRIA (2019)
 HV4656
 HV4656                         *CURRENT SURVEY CONTROL
 HV4656  ______________________________________________________________________
 HV4656* NAD 83(1993) POSITION- 38 51 53.49840(N) 077 01 35.51827(W)   ADJUSTED
 HV4656* NAVD 88 ORTHO HEIGHT -     2.    (meters)        7.    (feet) SCALED
 HV4656  ______________________________________________________________________
 HV4656  GEOID HEIGHT    -        -32.147 (meters)                     GEOID18
 HV4656  LAPLACE CORR    -         -3.00  (seconds)                    DEFLEC18
 HV4656  HORZ ORDER      -  SECOND
 HV4656
 HV4656.The horizontal coordinates were established by classical geodetic methods
 HV4656.and adjusted by the National Geodetic Survey in November 1994.
 HV4656
 HV4656.The orthometric height was scaled from a topographic map.
 HV4656
 HV4656.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4656.GEOID18 height accuracy estimate available here.
 HV4656
 HV4656.Click photographs - Photos may exist for this station.
 HV4656
 HV4656.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4656
 HV4656. The following values were computed from the NAD 83(1993) position.
 HV4656
 HV4656;                    North         East     Units Scale Factor Converg.
 HV4656;SPC MD       -   133,004.900   397,697.304   MT  0.99994987   -0 00 60.0
 HV4656;SPC MD       -   436,366.91  1,304,778.57   sFT  0.99994987   -0 00 60.0
 HV4656;SPC VA N     - 2,134,025.608 3,627,872.704   MT  0.99995768   +0 55 10.6
 HV4656;SPC VA N     - 7,001,382.35 11,902,445.70   sFT  0.99995768   +0 55 10.6
 HV4656;UTM  18      - 4,303,731.750   324,177.775   MT  0.99998068   -1 16 19.0
 HV4656
 HV4656!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4656!SPC MD       -   1.00000477  x   0.99994987  =   0.99995464
 HV4656!SPC VA N     -   1.00000477  x   0.99995768  =   0.99996245
 HV4656!UTM  18      -   1.00000477  x   0.99998068  =   0.99998545
 HV4656
 HV4656:                Primary Azimuth Mark                     Grid Az
 HV4656:SPC MD       -  BOUNDARY WITNESS MK 10 DC VA             243 16 35.5
 HV4656:SPC VA N     -  BOUNDARY WITNESS MK 10 DC VA             242 20 24.9
 HV4656:UTM  18      -  BOUNDARY WITNESS MK 10 DC VA             244 31 54.5
 HV4656
 HV4656_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2417703731(NAD 83)
 HV4656
 HV4656|---------------------------------------------------------------------|
 HV4656| PID    Reference Object                     Distance      Geod. Az  |
 HV4656|                                                           dddmmss.s |
 HV4656| HV1684 BOUNDARY WITNESS MK 10 DC VA        APPROX. 1.0 KM 2431535.5 |
 HV4656|---------------------------------------------------------------------|
 HV4656
 HV4656                          SUPERSEDED SURVEY CONTROL
 HV4656
 HV4656  NAD 83(1991)-  38 51 53.49698(N)    077 01 35.51964(W) AD(       ) 2
 HV4656  NAD 83(1986)-  38 51 53.49675(N)    077 01 35.53060(W) AD(       ) 2
 HV4656  NAD 27      -  38 51 53.09600(N)    077 01 36.60900(W) AD(       ) 2
 HV4656
 HV4656.Superseded values are not recommended for survey control.
 HV4656
 HV4656.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4656.See file dsdata.pdf to determine how the superseded data were derived.
 HV4656
 HV4656_MARKER: Z = SEE DESCRIPTION
 HV4656_SETTING: 0 = UNSPECIFIED SETTING
 HV4656_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4656
 HV4656  HISTORY     - Date     Condition        Report By
 HV4656  HISTORY     - 1934     MONUMENTED       CGS
 HV4656  HISTORY     - 1946     GOOD             CGS
 HV4656  HISTORY     - 1946     GOOD             CGS
 HV4656
 HV4656                          STATION DESCRIPTION
 HV4656
 HV4656'DESCRIBED BY COAST AND GEODETIC SURVEY 1934 (LOC)
 HV4656'STATION IS A COPPER WIRE SET IN THE CENTER OF A 4 1/2-INCH IRON
 HV4656'PIPE FILLED WITH CONCRETE AND EXTENDING 30 INCHES IN THE GROUND
 HV4656'SET IN THE MIDDLE OF THE E GUTTER OF THE HAINS POINT SPEEDWAY,
 HV4656'ABOUT 5,200 FEET SE OF THE RAILROAD BRIDGE, BETWEEN PARK ROADWAY
 HV4656'LAMP POSTS NOS. 50 AND 51, AND SW OF A LARGE WILLOW TREE WHICH
 HV4656'IS 150 FEET FROM THE SPEEDWAY.  PIPE PROJECTS ABOUT 2 INCHES
 HV4656'ABOVE THE LEVEL OF THE BRICKS OF THE GUTTER.
 HV4656
 HV4656                          STATION RECOVERY (1946)
 HV4656
 HV4656'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4656'RECOVERED AS DESCRIBED AND IN GOOD CONDITION.  DESCRIPTION
 HV4656'ADEQUATE.
 HV4656
 HV4656                          STATION RECOVERY (1946)
 HV4656
 HV4656'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (RCB)
 HV4656'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  COMPLETE
 HV4656'NEW DESCRIPTION FOLLOWS--STATION IS LOCATED IN THE E GUTTER OF
 HV4656'THE RAINS POINT DRIVE, ABOUT 1 MILE SE OF THE RAILROAD BRIDGE,
 HV4656'BETWEEN LAMPPOSTS 50 AND 51.  THE MARK IS COPPER WIRE SET IN
 HV4656'CONCRETE IN A 4-1/2-INCH IRON PIPE AND PROJECTS ABOUT 2 INCHES.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7716 ***********************************************************************
 HV7716  DESIGNATION -  E USE 1931
 HV7716  PID         -  HV7716
 HV7716  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7716  COUNTRY     -  US
 HV7716  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7716
 HV7716                         *CURRENT SURVEY CONTROL
 HV7716  ______________________________________________________________________
 HV7716* NAD 83(1993) POSITION- 38 53 23.67770(N) 076 58 29.82354(W)   ADJUSTED
 HV7716* NAVD 88 ORTHO HEIGHT -    13.9   (meters)       46.    (feet) VERTCON3
 HV7716  ______________________________________________________________________
 HV7716  GEOID HEIGHT    -        -32.192 (meters)                     GEOID18
 HV7716  LAPLACE CORR    -         -3.82  (seconds)                    DEFLEC18
 HV7716  HORZ ORDER      -  THIRD
 HV7716
 HV7716.The horizontal coordinates were established by classical geodetic methods
 HV7716.and adjusted by the National Geodetic Survey in November 1994.
 HV7716
 HV7716.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV7716.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV7716
 HV7716.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7716.GEOID18 height accuracy estimate available here.
 HV7716
 HV7716.Click photographs - Photos may exist for this station.
 HV7716
 HV7716.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7716
 HV7716. The following values were computed from the NAD 83(1993) position.
 HV7716
 HV7716;                    North         East     Units Scale Factor Converg.
 HV7716;SPC MD       -   135,785.582   402,173.156   MT  0.99994988   +0 00 56.6
 HV7716;SPC MD       -   445,489.86  1,319,463.10   sFT  0.99994988   +0 00 56.6
 HV7716;SPC VA N     - 2,136,879.073 3,632,302.565   MT  0.99995966   +0 57 06.5
 HV7716;SPC VA N     - 7,010,744.09 11,916,979.33   sFT  0.99995966   +0 57 06.5
 HV7716;UTM  18      - 4,306,413.741   328,713.581   MT  0.99996128   -1 14 24.8
 HV7716
 HV7716!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7716!SPC MD       -   1.00000288  x   0.99994988  =   0.99995276
 HV7716!SPC VA N     -   1.00000288  x   0.99995966  =   0.99996254
 HV7716!UTM  18      -   1.00000288  x   0.99996128  =   0.99996416
 HV7716
 HV7716:                Primary Azimuth Mark                     Grid Az
 HV7716:SPC MD       -  F USE 1931                               023 41 57.5
 HV7716:SPC VA N     -  F USE 1931                               022 45 47.6
 HV7716:UTM  18      -  F USE 1931                               024 57 18.9
 HV7716
 HV7716_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2871306413(NAD 83)
 HV7716
 HV7716|---------------------------------------------------------------------|
 HV7716| PID    Reference Object                     Distance      Geod. Az  |
 HV7716|                                                           dddmmss.s |
 HV7716| HV7714 F USE 1931                          APPROX. 1.1 KM 0234254.1 |
 HV7716|---------------------------------------------------------------------|
 HV7716
 HV7716                          SUPERSEDED SURVEY CONTROL
 HV7716
 HV7716  NAD 83(1991)-  38 53 23.67638(N)    076 58 29.82470(W) AD(       ) 3
 HV7716  NAD 83(1986)-  38 53 23.67564(N)    076 58 29.83579(W) AD(       ) 3
 HV7716  NAD 27      -  38 53 23.27000(N)    076 58 30.92800(W) AD(       ) 3
 HV7716  NGVD 29 (07/19/86)   14.1    (m)           46.     (f) VERT ANG       
 HV7716
 HV7716.Superseded values are not recommended for survey control.
 HV7716
 HV7716.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7716.See file dsdata.pdf to determine how the superseded data were derived.
 HV7716
 HV7716
 HV7716  HISTORY     - Date     Condition        Report By
 HV7716  HISTORY     - 1931     MONUMENTED       CGS
 HV7716  HISTORY     - 1958     MARK NOT FOUND   CGS
 HV7716
 HV7716                          STATION DESCRIPTION
 HV7716
 HV7716'DESCRIBED BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7716'DUE TO THE LACK OF A DESCRIPTION, THE STATION IS NOT RECOVERABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1235 ***********************************************************************
 HV1235  DESIGNATION -  EASTERN DCDHT
 HV1235  PID         -  HV1235
 HV1235  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1235  COUNTRY     -  US
 HV1235  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1235
 HV1235                         *CURRENT SURVEY CONTROL
 HV1235  ______________________________________________________________________
 HV1235* NAD 83(1986) POSITION- 38 54 43.     (N) 076 56 03.     (W)   SCALED
 HV1235* NAVD 88 ORTHO HEIGHT -     6.90  (+/-2cm)       22.6   (feet) VERTCON3
 HV1235  ______________________________________________________________________
 HV1235  GEOID HEIGHT    -        -32.244 (meters)                     GEOID18
 HV1235  VERT ORDER      -  ? (See Below)
 HV1235
 HV1235.The horizontal coordinates were scaled from a map and have
 HV1235.an estimated accuracy of +/- 6 seconds.
 HV1235
 HV1235.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1235.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1235
 HV1235.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1235.GEOID18 height accuracy estimate available here.
 HV1235
 HV1235.The vertical order pertains to the NGVD 29 superseded value.
 HV1235
 HV1235.Click photographs - Photos may exist for this station.
 HV1235
 HV1235
 HV1235_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ323087(NAD 83)
 HV1235
 HV1235                          SUPERSEDED SURVEY CONTROL
 HV1235
 HV1235  NGVD 29 (11/26/84)    7.137  (m)           23.42   (f) ADJUSTED       
 HV1235
 HV1235.Superseded values are not recommended for survey control.
 HV1235
 HV1235.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1235.See file dsdata.pdf to determine how the superseded data were derived.
 HV1235
 HV1235_MARKER: Z = SEE DESCRIPTION
 HV1235_SETTING: 45 = UNSPECIFIED DEEP UNSLEEVED SETTING (10 FT.+)
 HV1235_SP_SET: UNSPECIFIED DEEP SET
 HV1235_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1235+STABILITY: SURFACE MOTION
 HV1235
 HV1235  HISTORY     - Date     Condition        Report By
 HV1235  HISTORY     - UNK      MONUMENTED       DCDHT
 HV1235  HISTORY     - 1956     GOOD             CGS
 HV1235
 HV1235                          STATION DESCRIPTION
 HV1235
 HV1235'DESCRIBED BY COAST AND GEODETIC SURVEY 1956
 HV1235'AT WASHINGTON.
 HV1235'AT THE INTERSECTION OF KENILWORTH AND EASTERN AVENUES IN
 HV1235'NORTHEAST WASHINGTON.  IN THE CONCRETE ISLAND DIVIDING THE
 HV1235'TWO WAY TRAFFIC ALONG KENILWORTH AVENUE, AND DIRECTLY
 HV1235'BENEATH THE SOUTHERN EDGE OF EASTERN AVENUE OVERPASS.  A SPECIAL
 HV1235'DISTRICT OF COLUMBIA HIGHWAY DEPARTMENT DEEP MARK LOCATED UNDER
 HV1235'A 10 INCH STEEL COVER.  NOTE-- ACCESS TO THIS MARK IS OBTAINED
 HV1235'BY PREARRANGEMENT WITH ENGINEERS OF THE DISTRICT OF COLUMBIA
 HV1235'HIGHWAY DEPARTMENT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7696 ***********************************************************************
 HV7696  DESIGNATION -  EASTERN PRESB CH STONE SPIRE
 HV7696  PID         -  HV7696
 HV7696  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7696  COUNTRY     -  US
 HV7696  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7696
 HV7696                         *CURRENT SURVEY CONTROL
 HV7696  ______________________________________________________________________
 HV7696* NAD 83(1993) POSITION- 38 53 37.76157(N) 076 59 53.81364(W)   ADJUSTED
 HV7696  ______________________________________________________________________
 HV7696  GEOID HEIGHT    -        -32.139 (meters)                     GEOID18
 HV7696  LAPLACE CORR    -         -3.59  (seconds)                    DEFLEC18
 HV7696  HORZ ORDER      -  THIRD
 HV7696
 HV7696.The horizontal coordinates were established by classical geodetic methods
 HV7696.and adjusted by the National Geodetic Survey in November 1994.
 HV7696
 HV7696.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7696.GEOID18 height accuracy estimate available here.
 HV7696
 HV7696.Click photographs - Photos may exist for this station.
 HV7696
 HV7696.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7696
 HV7696. The following values were computed from the NAD 83(1993) position.
 HV7696
 HV7696;                    North         East     Units Scale Factor Converg.
 HV7696;SPC MD       -   136,219.569   400,149.076   MT  0.99994990   +0 00 03.9
 HV7696;SPC MD       -   446,913.70  1,312,822.43   sFT  0.99994990   +0 00 03.9
 HV7696;SPC VA N     - 2,137,279.937 3,630,271.645   MT  0.99995998   +0 56 14.1
 HV7696;SPC VA N     - 7,012,059.26 11,910,316.22   sFT  0.99995998   +0 56 14.1
 HV7696;UTM  18      - 4,306,891.998   326,699.469   MT  0.99996983   -1 15 18.0
 HV7696
 HV7696_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2669906891(NAD 83)
 HV7696
 HV7696                          SUPERSEDED SURVEY CONTROL
 HV7696
 HV7696  NAD 83(1991)-  38 53 37.76043(N)    076 59 53.81468(W) AD(       ) 3
 HV7696  NAD 83(1986)-  38 53 37.75977(N)    076 59 53.82531(W) AD(       ) 3
 HV7696  NAD 27      -  38 53 37.36000(N)    076 59 54.90900(W) AD(       ) 3
 HV7696  USSD        -  38 53 37.69700(N)    076 59 54.74000(W) AD(       ) 3
 HV7696
 HV7696.Superseded values are not recommended for survey control.
 HV7696
 HV7696.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7696.See file dsdata.pdf to determine how the superseded data were derived.
 HV7696
 HV7696_MARKER: 90 = CHURCH SPIRE
 HV7696
 HV7696  HISTORY     - Date     Condition        Report By
 HV7696  HISTORY     - 1913     FIRST OBSERVED   CGS
 HV7696  HISTORY     - 1939     GOOD             CGS
 HV7696  HISTORY     - 1958     GOOD             CGS
 HV7696  HISTORY     - 1971     GOOD             NGS
 HV7696  HISTORY     - 20030713 GOOD             GEOCAC
 HV7696
 HV7696                          STATION DESCRIPTION
 HV7696
 HV7696'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV7696'THIS STATION IS IN CENTER OF TALL STONE SPIRE OF EASTERN
 HV7696'PRESBYTERIAN CHURCH, AT 6TH, C, AND MARYLAND AVENUE, NE.
 HV7696
 HV7696                          STATION RECOVERY (1939)
 HV7696
 HV7696'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV7696'THIS STATION WAS RECOVERD INTACT.  THIS IS THE CENTER OF THE
 HV7696'CYLINDRICAL GRAY STONE TOWER ABOUT 80 FEET HIGH ON THE NW CORNER
 HV7696'OF THE EASTERN PRESBYTERIAN CHURCH WHICH IS LOCATED IN NE
 HV7696'WASHINGTON, BETWEEN C STREET, AND MARYLAND AVENUE, AT 6TH.
 HV7696
 HV7696                          STATION RECOVERY (1958)
 HV7696
 HV7696'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7696'THE STATION WAS RECOVERED IN GOOD CONDITION.  THE 1939 DESCRIPTION
 HV7696'BY T.M.P. JR. IS ADEQUATE AND COMPLETE.
 HV7696
 HV7696                          STATION RECOVERY (1971)
 HV7696
 HV7696'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7696'STATION WAS RECOVERED AS PREVIOUSLY DESCRIBED.
 HV7696'
 HV7696'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DISTRICT OF
 HV7696'COLUMBIA.
 HV7696
 HV7696                          STATION RECOVERY (2003)
 HV7696
 HV7696'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV7696'THIS PROMINENT STONE BUILDING IS NOW KNOWN AS IMANI TEMPLE ON CAPITOL
 HV7696'HILL. IT IS LOCATED ON THE EAST SIDE OF STANTON PARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4158 ***********************************************************************
 HV4158  DESIGNATION -  ECKINGTON PRESB CHURCH SPIRE
 HV4158  PID         -  HV4158
 HV4158  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4158  COUNTRY     -  US
 HV4158  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4158
 HV4158                         *CURRENT SURVEY CONTROL
 HV4158  ______________________________________________________________________
 HV4158* NAD 83(1993) POSITION- 38 54 38.94152(N) 077 00 31.45245(W)   ADJUSTED
 HV4158  ______________________________________________________________________
 HV4158  GEOID HEIGHT    -        -32.084 (meters)                     GEOID18
 HV4158  LAPLACE CORR    -         -3.31  (seconds)                    DEFLEC18
 HV4158  HORZ ORDER      -  THIRD
 HV4158
 HV4158.The horizontal coordinates were established by classical geodetic methods
 HV4158.and adjusted by the National Geodetic Survey in November 1994.
 HV4158
 HV4158.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4158.GEOID18 height accuracy estimate available here.
 HV4158
 HV4158.Click photographs - Photos may exist for this station.
 HV4158
 HV4158.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4158
 HV4158. The following values were computed from the NAD 83(1993) position.
 HV4158
 HV4158;                    North         East     Units Scale Factor Converg.
 HV4158;SPC MD       -   138,106.122   399,242.252   MT  0.99995003   -0 00 19.7
 HV4158;SPC MD       -   453,103.17  1,309,847.29   sFT  0.99995003   -0 00 19.7
 HV4158;SPC VA N     - 2,139,151.442 3,629,334.107   MT  0.99996146   +0 55 50.6
 HV4158;SPC VA N     - 7,018,199.36 11,907,240.32   sFT  0.99996146   +0 55 50.6
 HV4158;UTM  18      - 4,308,798.022   325,834.206   MT  0.99997353   -1 15 43.3
 HV4158
 HV4158_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2583408798(NAD 83)
 HV4158
 HV4158                          SUPERSEDED SURVEY CONTROL
 HV4158
 HV4158  NAD 83(1991)-  38 54 38.94048(N)    077 00 31.45346(W) AD(       ) 3
 HV4158  NAD 83(1986)-  38 54 38.93984(N)    077 00 31.46405(W) AD(       ) 3
 HV4158  NAD 27      -  38 54 38.54000(N)    077 00 32.54700(W) AD(       ) 3
 HV4158  USSD        -  38 54 38.87800(N)    077 00 32.37700(W) AD(       ) 3
 HV4158
 HV4158.Superseded values are not recommended for survey control.
 HV4158
 HV4158.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4158.See file dsdata.pdf to determine how the superseded data were derived.
 HV4158
 HV4158_MARKER: 90 = CHURCH SPIRE
 HV4158
 HV4158  HISTORY     - Date     Condition        Report By
 HV4158  HISTORY     - 1913     FIRST OBSERVED   CGS
 HV4158  HISTORY     - 1939     GOOD             CGS
 HV4158  HISTORY     - 19950623 GOOD             USPSQD
 HV4158
 HV4158                          STATION DESCRIPTION
 HV4158
 HV4158'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4158'STATION IS CENTER OF SPIRE ON ECKINGTON PRESBYTERIAN CHURCH
 HV4158'AT NE CORNER OF N CAPITOL STREET, AND FLORIDA AVENUE.
 HV4158
 HV4158                          STATION RECOVERY (1939)
 HV4158
 HV4158'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4158'STATION RECOVERED INTACT.  THIS IS THE CENTER OF THE SQUARE TOWER
 HV4158'WITH THE PRYAMIDAL ROOF LOCATED ON THE SW CORNER OF THE ECKINGTON
 HV4158'PRESBYTERIAN CHURCH WHICH IS IN NE WASHINGTON, ON THE E SIDE
 HV4158'OF N CAPITOL STREET BETWEEN FLORIDA AVENUE AND Q STREET.
 HV4158'
 HV4158'THE TOWER IS APPROXIMATELY 70 FEET HIGH.
 HV4158
 HV4158                          STATION RECOVERY (1995)
 HV4158
 HV4158'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4158'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4276 ***********************************************************************
 HV4276  DESIGNATION -  ELECTRIC
 HV4276  PID         -  HV4276
 HV4276  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4276  COUNTRY     -  US
 HV4276  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4276
 HV4276                         *CURRENT SURVEY CONTROL
 HV4276  ______________________________________________________________________
 HV4276* NAD 83(1993) POSITION- 38 54 06.82988(N) 077 03 43.99301(W)   ADJUSTED
 HV4276* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV4276  ______________________________________________________________________
 HV4276  GEOID HEIGHT    -        -32.031 (meters)                     GEOID18
 HV4276  LAPLACE CORR    -         -2.64  (seconds)                    DEFLEC18
 HV4276  HORZ ORDER      -  THIRD
 HV4276
 HV4276.The horizontal coordinates were established by classical geodetic methods
 HV4276.and adjusted by the National Geodetic Survey in November 1994.
 HV4276
 HV4276.The orthometric height was scaled from a topographic map.
 HV4276
 HV4276.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4276.GEOID18 height accuracy estimate available here.
 HV4276
 HV4276.Click photographs - Photos may exist for this station.
 HV4276
 HV4276.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4276
 HV4276. The following values were computed from the NAD 83(1993) position.
 HV4276
 HV4276;                    North         East     Units Scale Factor Converg.
 HV4276;SPC MD       -   137,117.744   394,602.916   MT  0.99994995   -0 02 20.6
 HV4276;SPC MD       -   449,860.47  1,294,626.40   sFT  0.99994995   -0 02 20.6
 HV4276;SPC VA N     - 2,138,087.373 3,624,711.491   MT  0.99996067   +0 53 50.4
 HV4276;SPC VA N     - 7,014,708.32 11,892,074.28   sFT  0.99996067   +0 53 50.4
 HV4276;UTM  18      - 4,307,911.579   321,174.157   MT  0.99999379   -1 17 43.4
 HV4276
 HV4276!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4276!SPC MD       -   1.00000491  x   0.99994995  =   0.99995486
 HV4276!SPC VA N     -   1.00000491  x   0.99996067  =   0.99996558
 HV4276!UTM  18      -   1.00000491  x   0.99999379  =   0.99999870
 HV4276
 HV4276:                Primary Azimuth Mark                     Grid Az
 HV4276:SPC MD       -  DAM                                      238 03 44.2
 HV4276:SPC VA N     -  DAM                                      237 07 33.2
 HV4276:UTM  18      -  DAM                                      239 19 07.0
 HV4276
 HV4276_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2117407911(NAD 83)
 HV4276
 HV4276|---------------------------------------------------------------------|
 HV4276| PID    Reference Object                     Distance      Geod. Az  |
 HV4276|                                                           dddmmss.s |
 HV4276| HV4450 SMOOT                               300.617 METERS 11406     |
 HV4276| HV4400 SCOW USE 1932                       399.998 METERS 15845     |
 HV4276| HV4250 D                                   236.536 METERS 19636     |
 HV4276| HV4207 DAM                                 454.199 METERS 2380123.6 |
 HV4276| HV4224 BARREL                              249.729 METERS 28520     |
 HV4276|---------------------------------------------------------------------|
 HV4276
 HV4276                          SUPERSEDED SURVEY CONTROL
 HV4276
 HV4276  NAD 83(1991)-  38 54 06.82864(N)    077 03 43.99457(W) AD(       ) 3
 HV4276  NAD 83(1986)-  38 54 06.82827(N)    077 03 44.00493(W) AD(       ) 3
 HV4276  NAD 27      -  38 54 06.42800(N)    077 03 45.07900(W) AD(       ) 3
 HV4276
 HV4276.Superseded values are not recommended for survey control.
 HV4276
 HV4276.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4276.See file dsdata.pdf to determine how the superseded data were derived.
 HV4276
 HV4276_MARKER: DD = SURVEY DISK
 HV4276_SETTING: 17 = SET INTO TOP OF METAL PIPE DRIVEN INTO GROUND
 HV4276_MARK LOGO: USACE
 HV4276_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4276
 HV4276  HISTORY     - Date     Condition        Report By
 HV4276  HISTORY     - 1932     MONUMENTED       CGS
 HV4276  HISTORY     - 1946     GOOD             CGS
 HV4276
 HV4276                          STATION DESCRIPTION
 HV4276
 HV4276'DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4276'STATION SITE IS ON THE E SHORE OF THE POTOMAC RIVER IN THE
 HV4276'DISTRICT OF COLUMBIA, IN A LOCALITY KNOWN AS GEORGETOWN.
 HV4276'IT IS NEAR THE RIVERBANK AT THE FOOT OF WISCONSIN AVENUE,
 HV4276'BETWEEN THE POWERHOUSE AND THE RIVER, 2.9 FEET N OF SEA WALL,
 HV4276'10.13 FEET S OF POWERHOUSE, AND 113.53 FEET E OF W SEA WALL
 HV4276'OF WISCONSIN AVENUE EXTENDED.
 HV4276'
 HV4276'STATION IS A STANDARD U.S.E. DISK SET IN CONCRETE IN A 4-INCH
 HV4276'CAST-IRON PIPE, SET FLUSH WITH THE SURFACE OF CINDER-FILL
 HV4276'ABOUT 12.5 FEET ABOVE MEAN LOW WATER.  REFERENCE MONUMENT
 HV4276'IS A STANDARD BRONZE DISK NO. 152 SET IN CONCRETE IN A 6-INCH
 HV4276'CAST-IRON PIPE, 90.5 FEET N OF THE STATION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1997 ***********************************************************************
 HV1997  DESIGNATION -  ENGINEER WHARF USE
 HV1997  PID         -  HV1997
 HV1997  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1997  COUNTRY     -  US
 HV1997  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1997
 HV1997                         *CURRENT SURVEY CONTROL
 HV1997  ______________________________________________________________________
 HV1997* NAD 83(1986) POSITION- 38 52 43.     (N) 077 02 05.     (W)   SCALED
 HV1997* NAVD 88 ORTHO HEIGHT -     1.593 (meters)        5.23  (feet) POSTED
 HV1997  ______________________________________________________________________
 HV1997  GEOID HEIGHT    -        -32.110 (meters)                     GEOID18
 HV1997  DYNAMIC HEIGHT  -          1.59  (meters)        5.2   (feet) COMP
 HV1997  MODELED GRAVITY -    980,097.1   (mgal)                       NAVD 88
 HV1997
 HV1997  VERT ORDER      -  * POSTED, SEE BELOW
 HV1997
 HV1997.The horizontal coordinates were scaled from a map and have
 HV1997.an estimated accuracy of +/- 6 seconds.
 HV1997
 HV1997.The orthometric height was determined by differential leveling
 HV1997.and adjusted by the NATIONAL GEODETIC SURVEY in 1992.
 HV1997
 HV1997.* This is a POSTED BENCH MARK height.
 HV1997
 HV1997.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1997.GEOID18 height accuracy estimate available here.
 HV1997
 HV1997.Click photographs - Photos may exist for this station.
 HV1997
 HV1997.The dynamic height is computed by dividing the NAVD 88
 HV1997.geopotential number by the normal gravity value computed on the
 HV1997.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1997.degrees latitude (g = 980.6199 gals.).
 HV1997
 HV1997.The modeled gravity was interpolated from observed gravity values.
 HV1997
 HV1997
 HV1997_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ235052(NAD 83)
 HV1997
 HV1997                          SUPERSEDED SURVEY CONTROL
 HV1997
 HV1997  NGVD 29 (11/26/84)    1.827  (m)            5.99   (f) ADJUSTED    1 2
 HV1997
 HV1997.Superseded values are not recommended for survey control.
 HV1997
 HV1997.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1997.See file dsdata.pdf to determine how the superseded data were derived.
 HV1997
 HV1997_MARKER: Z = SEE DESCRIPTION
 HV1997_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1997_SP_SET: DOORSILL
 HV1997_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1997
 HV1997  HISTORY     - Date     Condition        Report By
 HV1997  HISTORY     - UNK      MONUMENTED       USACE
 HV1997  HISTORY     - 1926     GOOD             PBPP
 HV1997  HISTORY     - 1972     MARK NOT FOUND   NGS
 HV1997
 HV1997                          STATION DESCRIPTION
 HV1997
 HV1997'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1997'AT WASHINGTON.
 HV1997'AT WASHINGTON, IN EAST POTOMAC PARK, NEAR THE RAILROAD BRIDGE
 HV1997'OVER THE EAST SPEEDWAY, AT THE BUILDING USED AS A CONCESSION
 HV1997'STAND (FORMERLY THE U.S. ENGINEER WHARF STOREHOUSE), AT THE
 HV1997'NORTHWEST ENTRANCE, IN THE NORTHWEST END OF THE DOORSILL, 0.8
 HV1997'FOOT FROM THE DOOR FRAME, AND 0.5 FOOT OUT FROM THE FACE OF THE
 HV1997'WALL.  A 1/2-INCH BRASS PIPE LEADED INTO THE SILL.  NOTE-- IT
 HV1997'WAS REPORTED THAT THE NORTHWEST ENTRANCE HAS BEEN CLOSED BY A
 HV1997'SOLID WALL CONTAINING A WINDOW.  IF THE MARK STILL EXISTS, IT
 HV1997'IS UNDER THIS WALL.  NOTE-- LEVELING BY THE NATIONAL CAPITAL
 HV1997'PARKS SURVEY OFFICE HAS SHOWN THAT SOME OF THEM HAVE SETTLED.
 HV1997'USE WITH CAUTION.
 HV1997
 HV1997                          STATION RECOVERY (1972)
 HV1997
 HV1997'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1972
 HV1997'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1995 ***********************************************************************
 HV1995  DESIGNATION -  EP 10
 HV1995  PID         -  HV1995
 HV1995  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1995  COUNTRY     -  US
 HV1995  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1995
 HV1995                         *CURRENT SURVEY CONTROL
 HV1995  ______________________________________________________________________
 HV1995* NAD 83(1986) POSITION- 38 52 37.9    (N) 077 02 10.7    (W)   HD_HELD2
 HV1995* NAVD 88 ORTHO HEIGHT -     2.538 (meters)        8.33  (feet) ADJUSTED
 HV1995  ______________________________________________________________________
 HV1995  GEOID HEIGHT    -        -32.111 (meters)                     GEOID18
 HV1995  DYNAMIC HEIGHT  -          2.537 (meters)        8.32  (feet) COMP
 HV1995  MODELED GRAVITY -    980,096.8   (mgal)                       NAVD 88
 HV1995
 HV1995  VERT ORDER      -  FIRST     CLASS II
 HV1995
 HV1995.The horizontal coordinates were established by autonomous hand held GPS
 HV1995.observations and have an estimated accuracy of +/- 10 meters.
 HV1995
 HV1995.The orthometric height was determined by differential leveling and
 HV1995.adjusted by the NATIONAL GEODETIC SURVEY
 HV1995.in April 2010.
 HV1995
 HV1995.No vertical observational check was made to the station.
 HV1995
 HV1995.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1995.GEOID18 height accuracy estimate available here.
 HV1995
 HV1995.Click photographs - Photos may exist for this station.
 HV1995
 HV1995.The dynamic height is computed by dividing the NAVD 88
 HV1995.geopotential number by the normal gravity value computed on the
 HV1995.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1995.degrees latitude (g = 980.6199 gals.).
 HV1995
 HV1995.The modeled gravity was interpolated from observed gravity values.
 HV1995
 HV1995
 HV1995_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2336005119(NAD 83)
 HV1995
 HV1995                          SUPERSEDED SURVEY CONTROL
 HV1995
 HV1995  NAVD 88 (06/15/91)    2.547  (m)            8.36   (f) SUPERSEDED  1 1
 HV1995  NGVD 29 (11/26/84)    2.783  (m)            9.13   (f) ADJUSTED    1 1
 HV1995
 HV1995.Superseded values are not recommended for survey control.
 HV1995
 HV1995.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1995.See file dsdata.pdf to determine how the superseded data were derived.
 HV1995
 HV1995_MARKER: DD = SURVEY DISK
 HV1995_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1995_SP_SET: RAILROAD BRIDGE FOUNDATION
 HV1995_MARK LOGO: BORR
 HV1995_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1995_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1995+SATELLITE: SATELLITE OBSERVATIONS - March 01, 2012
 HV1995
 HV1995  HISTORY     - Date     Condition        Report By
 HV1995  HISTORY     - UNK      MONUMENTED       PBPP
 HV1995  HISTORY     - 1971     GOOD             NGS
 HV1995  HISTORY     - 20070928 GOOD             NGS
 HV1995  HISTORY     - 20081222 GOOD             NGS
 HV1995  HISTORY     - 20120301 GOOD             NGS
 HV1995
 HV1995                          STATION DESCRIPTION
 HV1995
 HV1995'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1995'AT WASHINGTON.
 HV1995'AT WASHINGTON, D.C., AT THE NORTHEAST END OF THE RICHMOND
 HV1995'FREDERICKSBURG AND POTOMAC RAILROAD BRIDGE OVER THE POTOMAC
 HV1995'RIVER AT EAST POTOMAC PARK, SET VERTICALLY IN THE SOUTHWEST
 HV1995'FACE OF THE STONE FOUNDATION FOR THE BRIDGE, 19 FEET NORTHEAST
 HV1995'OF THE CENTER LINE OF OHIO DRIVE WHICH LEADS SOUTHEAST OF HAINS
 HV1995'POINT, ABOUT 17 FEET BELOW THE LEVEL OF THE TRACK, AND ABOUT
 HV1995'2 FEET ABOVE THE LEVEL OF THE DRIVE.
 HV1995
 HV1995                          STATION RECOVERY (2007)
 HV1995
 HV1995'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2007 (DRD)
 HV1995'RECOVERED IN GOOD CONDITION.
 HV1995
 HV1995                          STATION RECOVERY (2008)
 HV1995
 HV1995'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV1995'RECOVERED AS DESCRIBED.
 HV1995
 HV1995                          STATION RECOVERY (2012)
 HV1995
 HV1995'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1995'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2000 ***********************************************************************
 HV2000  DESIGNATION -  EP 3 PBPP
 HV2000  PID         -  HV2000
 HV2000  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2000  COUNTRY     -  US
 HV2000  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2000
 HV2000                         *CURRENT SURVEY CONTROL
 HV2000  ______________________________________________________________________
 HV2000* NAD 83(1986) POSITION- 38 52 49.     (N) 077 02 26.     (W)   SCALED
 HV2000* NAVD 88 ORTHO HEIGHT -     1.22  (+/-2cm)        4.0   (feet) VERTCON3
 HV2000  ______________________________________________________________________
 HV2000  GEOID HEIGHT    -        -32.099 (meters)                     GEOID18
 HV2000  VERT ORDER      -  ? (See Below)
 HV2000
 HV2000.The horizontal coordinates were scaled from a map and have
 HV2000.an estimated accuracy of +/- 6 seconds.
 HV2000
 HV2000.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV2000.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV2000
 HV2000.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2000.GEOID18 height accuracy estimate available here.
 HV2000
 HV2000.The vertical order pertains to the NGVD 29 superseded value.
 HV2000
 HV2000.Click photographs - Photos may exist for this station.
 HV2000
 HV2000
 HV2000_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ229054(NAD 83)
 HV2000
 HV2000                          SUPERSEDED SURVEY CONTROL
 HV2000
 HV2000  NGVD 29 (11/26/84)    1.464  (m)            4.80   (f) ADJUSTED       
 HV2000
 HV2000.Superseded values are not recommended for survey control.
 HV2000
 HV2000.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2000.See file dsdata.pdf to determine how the superseded data were derived.
 HV2000
 HV2000_MARKER: Z = SEE DESCRIPTION
 HV2000_SETTING: 0 = UNSPECIFIED SETTING
 HV2000_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2000
 HV2000  HISTORY     - Date     Condition        Report By
 HV2000  HISTORY     - UNK      MONUMENTED       PBPP
 HV2000  HISTORY     - 1926     GOOD             CGS
 HV2000
 HV2000                          STATION DESCRIPTION
 HV2000
 HV2000'DESCRIBED BY COAST AND GEODETIC SURVEY 1926
 HV2000'AT WASHINGTON.
 HV2000'NO DESCRIPTION FOR THIS MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2016 ***********************************************************************
 HV2016  DESIGNATION -  EP 4
 HV2016  PID         -  HV2016
 HV2016  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2016  COUNTRY     -  US
 HV2016  USGS QUAD   -  ALEXANDRIA (2019)
 HV2016
 HV2016                         *CURRENT SURVEY CONTROL
 HV2016  ______________________________________________________________________
 HV2016* NAD 83(1986) POSITION- 38 51 28.     (N) 077 01 21.     (W)   SCALED
 HV2016* NAVD 88 ORTHO HEIGHT -     2.54  (+/-2cm)        8.3   (feet) VERTCON3
 HV2016  ______________________________________________________________________
 HV2016  GEOID HEIGHT    -        -32.165 (meters)                     GEOID18
 HV2016  VERT ORDER      -  ? (See Below)
 HV2016
 HV2016.The horizontal coordinates were scaled from a map and have
 HV2016.an estimated accuracy of +/- 6 seconds.
 HV2016
 HV2016.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV2016.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV2016
 HV2016.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2016.GEOID18 height accuracy estimate available here.
 HV2016
 HV2016.The vertical order pertains to the NGVD 29 superseded value.
 HV2016
 HV2016.Click photographs - Photos may exist for this station.
 HV2016
 HV2016
 HV2016_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ245029(NAD 83)
 HV2016
 HV2016                          SUPERSEDED SURVEY CONTROL
 HV2016
 HV2016  NGVD 29 (11/26/84)    2.787  (m)            9.14   (f) ADJUSTED       
 HV2016
 HV2016.Superseded values are not recommended for survey control.
 HV2016
 HV2016.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2016.See file dsdata.pdf to determine how the superseded data were derived.
 HV2016
 HV2016_MARKER: DD = SURVEY DISK
 HV2016_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV2016_SP_SET: SLAB
 HV2016_MARK LOGO: PBPP
 HV2016_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2016
 HV2016  HISTORY     - Date     Condition        Report By
 HV2016  HISTORY     - UNK      MONUMENTED       PBPP
 HV2016  HISTORY     - 1926     GOOD             PBPP
 HV2016  HISTORY     - 1945     GOOD             CGS
 HV2016  HISTORY     - 20040223 MARK NOT FOUND   GEOCAC
 HV2016
 HV2016                          STATION DESCRIPTION
 HV2016
 HV2016'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV2016'AT WASHINGTON.
 HV2016'AT WASHINGTON, IN EAST POTOMAC PARK, ON HAINS POINT, ON THE WEST
 HV2016'SIDE OF THE HAINS POINT TEA HOUSE, IN THE SOUTHWEST CORNER OF THE
 HV2016'PORCH, 11 FEET SOUTH OF THE WALL, AND 8 INCHES EAST OF THE WEST
 HV2016'EDGE OF THE CONCRETE PORCH SLAB.  A PUBLIC BUILDINGS AND PUBLIC
 HV2016'PARKS STANDARD DISK.  NOTE-- LEVELING BY THE NATIONAL CAPITAL
 HV2016'PARKS SURVEY OFFICE HAS SHOWN THAT SOME OF THEM HAVE SETTLED.
 HV2016'USE WITH CAUTION.
 HV2016
 HV2016                          STATION RECOVERY (1945)
 HV2016
 HV2016'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1945
 HV2016'RECOVERED IN GOOD CONDITION.
 HV2016
 HV2016                          STATION RECOVERY (2004)
 HV2016
 HV2016'RECOVERY NOTE BY GEOCACHING 2004 (APC)
 HV2016'THE HAINS POINT TEA HOUSE WAS DEMOLISHED MANY YEARS AGO.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2014 ***********************************************************************
 HV2014  DESIGNATION -  EP 6
 HV2014  PID         -  HV2014
 HV2014  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2014  COUNTRY     -  US
 HV2014  USGS QUAD   -  ALEXANDRIA (2019)
 HV2014
 HV2014                         *CURRENT SURVEY CONTROL
 HV2014  ______________________________________________________________________
 HV2014* NAD 83(1986) POSITION- 38 51 28.     (N) 077 01 21.     (W)   SCALED
 HV2014* NAVD 88 ORTHO HEIGHT -     0.79  (+/-2cm)        2.6   (feet) VERTCON3
 HV2014  ______________________________________________________________________
 HV2014  GEOID HEIGHT    -        -32.165 (meters)                     GEOID18
 HV2014  VERT ORDER      -  ? (See Below)
 HV2014
 HV2014.The horizontal coordinates were scaled from a map and have
 HV2014.an estimated accuracy of +/- 6 seconds.
 HV2014
 HV2014.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV2014.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV2014
 HV2014.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2014.GEOID18 height accuracy estimate available here.
 HV2014
 HV2014.The vertical order pertains to the NGVD 29 superseded value.
 HV2014
 HV2014.Click photographs - Photos may exist for this station.
 HV2014
 HV2014
 HV2014_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ245029(NAD 83)
 HV2014
 HV2014                          SUPERSEDED SURVEY CONTROL
 HV2014
 HV2014  NGVD 29 (11/26/84)    1.041  (m)            3.42   (f) ADJUSTED       
 HV2014
 HV2014.Superseded values are not recommended for survey control.
 HV2014
 HV2014.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2014.See file dsdata.pdf to determine how the superseded data were derived.
 HV2014
 HV2014_MARKER: DD = SURVEY DISK
 HV2014_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV2014_SP_SET: SIDEWALK
 HV2014_MARK LOGO: PBPP
 HV2014_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2014
 HV2014  HISTORY     - Date     Condition        Report By
 HV2014  HISTORY     - UNK      MONUMENTED       PBPP
 HV2014  HISTORY     - 1926     GOOD             PBPP
 HV2014  HISTORY     - 1959     MARK NOT FOUND   CGS
 HV2014
 HV2014                          STATION DESCRIPTION
 HV2014
 HV2014'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV2014'AT WASHINGTON.
 HV2014'AT WASHINGTON, IN EAST POTOMAC PARK, AT THE WASHINGTON CHANNEL
 HV2014'SIDE OF THE PARK, OPPOSITE THE UPSTREAM SIDE OF THE BOAT LANDING
 HV2014'NEAR HAINS POINT, OPPOSITE A POINT 49 FEET UPSTREAM FROM LAMPPOST
 HV2014'84, IN THE CONCRETE WALK, BETWEEN THE GUARDRAIL AND THE RIVERSIDE
 HV2014'OF THE WALK, AND 8 INCHES FROM THE OUTER EDGE.  A PUBLIC
 HV2014'BUILDINGS AND PUBLIC PARKS STANDARD DISK.  NOTE-- LEVELING BY THE
 HV2014'NATIONAL CAPITAL PARKS SURVEY OFFICE HAS SHOWN THAT SOME OF THEM
 HV2014'HAVE SETTLED.  USE WITH CAUTION.
 HV2014
 HV2014                          STATION RECOVERY (1959)
 HV2014
 HV2014'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959
 HV2014'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2012 ***********************************************************************
 HV2012  DESIGNATION -  EP 8
 HV2012  PID         -  HV2012
 HV2012  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2012  COUNTRY     -  US
 HV2012  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2012
 HV2012                         *CURRENT SURVEY CONTROL
 HV2012  ______________________________________________________________________
 HV2012* NAD 83(1986) POSITION- 38 52 32.9    (N) 077 01 31.6    (W)   HD_HELD2
 HV2012* NAVD 88 ORTHO HEIGHT -     0.90  (+/-2cm)        3.0   (feet) VERTCON3
 HV2012  ______________________________________________________________________
 HV2012  GEOID HEIGHT    -        -32.129 (meters)                     GEOID18
 HV2012  VERT ORDER      -  ? (See Below)
 HV2012
 HV2012.The horizontal coordinates were established by autonomous hand held GPS
 HV2012.observations and have an estimated accuracy of +/- 10 meters.
 HV2012
 HV2012.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV2012.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV2012
 HV2012.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2012.GEOID18 height accuracy estimate available here.
 HV2012
 HV2012.The vertical order pertains to the NGVD 29 superseded value.
 HV2012
 HV2012.Click photographs - Photos may exist for this station.
 HV2012
 HV2012
 HV2012_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2429904944(NAD 83)
 HV2012
 HV2012                          SUPERSEDED SURVEY CONTROL
 HV2012
 HV2012  NGVD 29 (11/26/84)    1.148  (m)            3.77   (f) ADJUSTED       
 HV2012
 HV2012.Superseded values are not recommended for survey control.
 HV2012
 HV2012.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2012.See file dsdata.pdf to determine how the superseded data were derived.
 HV2012
 HV2012_MARKER: DD = SURVEY DISK
 HV2012_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
 HV2012_SP_SET: SEAWALL
 HV2012_MARK LOGO: PBPP
 HV2012_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV2012+STABILITY: SURFACE MOTION
 HV2012_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV2012+SATELLITE: SATELLITE OBSERVATIONS - September 28, 2007
 HV2012
 HV2012  HISTORY     - Date     Condition        Report By
 HV2012  HISTORY     - UNK      MONUMENTED       PBPP
 HV2012  HISTORY     - 1926     GOOD             PBPP
 HV2012  HISTORY     - 20070928 GOOD             NGS
 HV2012
 HV2012                          STATION DESCRIPTION
 HV2012
 HV2012'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV2012'AT WASHINGTON.
 HV2012'AT WASHINGTON, IN EAST POTOMAC PARK, AT THE WASHINGTON CHANNEL
 HV2012'SIDE OF THE PARK, IN LINE WITH THE NORTHWEST SIDE OF THE
 HV2012'SOUTHEAST SECTION OF THE GOLF-FIELDHOUSE, AND IN THE CENTER OF
 HV2012'THE TOP OF THE SEAWALL.  A PUBLIC BUILDINGS AND PUBLIC PARKS
 HV2012'STANDARD DISK.  NOTE-- LEVELING BY THE NATIONAL CAPITAL PARKS
 HV2012'SURVEY OFFICE HAS SHOWN THAT SOME OF THEM HAVE SETTLED.  USE
 HV2012'WITH CAUTION.
 HV2012
 HV2012                          STATION RECOVERY (2007)
 HV2012
 HV2012'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2007 (DRD)
 HV2012'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2011 ***********************************************************************
 HV2011  DESIGNATION -  EP 9
 HV2011  PID         -  HV2011
 HV2011  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2011  COUNTRY     -  US
 HV2011  USGS QUAD   -  ALEXANDRIA (2019)
 HV2011
 HV2011                         *CURRENT SURVEY CONTROL
 HV2011  ______________________________________________________________________
 HV2011* NAD 83(1986) POSITION- 38 52 28.     (N) 077 01 37.     (W)   SCALED
 HV2011* NAVD 88 ORTHO HEIGHT -     3.75  (+/-2cm)       12.3   (feet) VERTCON3
 HV2011  ______________________________________________________________________
 HV2011  GEOID HEIGHT    -        -32.129 (meters)                     GEOID18
 HV2011  VERT ORDER      -  ? (See Below)
 HV2011
 HV2011.The horizontal coordinates were scaled from a map and have
 HV2011.an estimated accuracy of +/- 6 seconds.
 HV2011
 HV2011.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV2011.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV2011
 HV2011.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2011.GEOID18 height accuracy estimate available here.
 HV2011
 HV2011.The vertical order pertains to the NGVD 29 superseded value.
 HV2011
 HV2011.Click photographs - Photos may exist for this station.
 HV2011
 HV2011
 HV2011_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ241047(NAD 83)
 HV2011
 HV2011                          SUPERSEDED SURVEY CONTROL
 HV2011
 HV2011  NGVD 29 (11/26/84)    3.997  (m)           13.11   (f) ADJUSTED       
 HV2011
 HV2011.Superseded values are not recommended for survey control.
 HV2011
 HV2011.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2011.See file dsdata.pdf to determine how the superseded data were derived.
 HV2011
 HV2011_MARKER: DD = SURVEY DISK
 HV2011_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
 HV2011_SP_SET: RETAINING WALL
 HV2011_STAMPING: EP 9
 HV2011_MARK LOGO: PBPP
 HV2011_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV2011+STABILITY: SURFACE MOTION
 HV2011
 HV2011  HISTORY     - Date     Condition        Report By
 HV2011  HISTORY     - UNK      MONUMENTED       PBPP
 HV2011  HISTORY     - 1926     GOOD             PBPP
 HV2011  HISTORY     - 20020902 MARK NOT FOUND   INDIV
 HV2011
 HV2011                          STATION DESCRIPTION
 HV2011
 HV2011'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV2011'AT WASHINGTON.
 HV2011'AT WASHINGTON, IN EAST POTOMAC PARK, AT THE GOLF-FIELDHOUSE, AT
 HV2011'THE NORTHWEST CORNER OF THE EAST WING, AT THE NORTHWEST CORNER
 HV2011'OF THE PORCH, IN THE NORTH FACE OF THE SMALL RETAINING WALL
 HV2011'AROUND A BASEMENT WINDOW, 6 INCHES EAST OF THE NORTHWEST CORNER
 HV2011'OF THE WALL, AND 3 FEET BELOW THE TOP OF THE WALL.  A PUBLIC
 HV2011'BUILDINGS AND PUBLIC PARKS STANDARD DISK, SET VERTICALLY.
 HV2011'NOTE-- LEVELING BY THE NATIONAL CAPITAL PARKS SURVEY OFFICE HAS
 HV2011'SHOWN THAT SOME OF THEM HAVE SETTLED.  USE WITH CAUTION.
 HV2011
 HV2011                          STATION RECOVERY (2002)
 HV2011
 HV2011'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 HV2011'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1860 ***********************************************************************
 HV1860  DESIGNATION -  ERICSSONS TOE
 HV1860  PID         -  HV1860
 HV1860  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1860  COUNTRY     -  US
 HV1860  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1860
 HV1860                         *CURRENT SURVEY CONTROL
 HV1860  ______________________________________________________________________
 HV1860* NAD 83(1986) POSITION- 38 53 12.04   (N) 077 03 00.62   (W)   HD_HELD1
 HV1860* NAVD 88 ORTHO HEIGHT -     5.182 (meters)       17.00  (feet) ADJUSTED
 HV1860  ______________________________________________________________________
 HV1860  GEOID HEIGHT    -        -32.074 (meters)                     GEOID18
 HV1860  DYNAMIC HEIGHT  -          5.179 (meters)       16.99  (feet) COMP
 HV1860  MODELED GRAVITY -    980,095.7   (mgal)                       NAVD 88
 HV1860
 HV1860  VERT ORDER      -  FIRST     CLASS II
 HV1860
 HV1860.The horizontal coordinates were determined by differentially corrected
 HV1860.hand held GPS observations or other comparable positioning techniques
 HV1860.and have an estimated accuracy of +/- 3 meters.
 HV1860
 HV1860.The orthometric height was determined by differential leveling and
 HV1860.adjusted by the NATIONAL GEODETIC SURVEY
 HV1860.in October 2012.
 HV1860
 HV1860.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1860.GEOID18 height accuracy estimate available here.
 HV1860
 HV1860.Click photographs - Photos may exist for this station.
 HV1860
 HV1860.The dynamic height is computed by dividing the NAVD 88
 HV1860.geopotential number by the normal gravity value computed on the
 HV1860.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1860.degrees latitude (g = 980.6199 gals.).
 HV1860
 HV1860.The modeled gravity was interpolated from observed gravity values.
 HV1860
 HV1860
 HV1860_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2218106198(NAD 83)
 HV1860
 HV1860                          SUPERSEDED SURVEY CONTROL
 HV1860
 HV1860  NAVD 88 (04/20/10)    5.184  (m)           17.01   (f) SUPERSEDED  1 2
 HV1860  NAVD 88 (06/15/91)    5.242  (m)           17.20   (f) SUPERSEDED  1 2
 HV1860  NGVD 29 (11/26/84)    5.478  (m)           17.97   (f) ADJUSTED    1 2
 HV1860
 HV1860.Superseded values are not recommended for survey control.
 HV1860
 HV1860.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1860.See file dsdata.pdf to determine how the superseded data were derived.
 HV1860
 HV1860_MARKER: Z = SEE DESCRIPTION
 HV1860_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1860_SP_SET: PEDESTAL
 HV1860_MARK LOGO: NONE
 HV1860_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1860_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1860+SATELLITE: SATELLITE OBSERVATIONS - July 17, 2018
 HV1860
 HV1860  HISTORY     - Date     Condition        Report By
 HV1860  HISTORY     - UNK      MONUMENTED       CGS
 HV1860  HISTORY     - 1941     GOOD             CGS
 HV1860  HISTORY     - 1956     GOOD             CGS
 HV1860  HISTORY     - 20040612 GOOD             NGS
 HV1860  HISTORY     - 20081118 GOOD             NGS
 HV1860  HISTORY     - 20081212 GOOD             NGS
 HV1860  HISTORY     - 20100314 GOOD             GEOCAC
 HV1860  HISTORY     - 20120301 GOOD             NGS
 HV1860  HISTORY     - 20180717 GOOD             USPSQD
 HV1860
 HV1860                          STATION DESCRIPTION
 HV1860
 HV1860'DESCRIBED BY COAST AND GEODETIC SURVEY 1941
 HV1860'AT WASHINGTON.
 HV1860'AT WASHINGTON, IN WEST POTOMAC PARK, SOUTH OF THE LINCOLN
 HV1860'MEMORIAL, AT THE ERICSSON MEMORIAL, ON THE TOP OF THE PEDESTAL,
 HV1860'AND DIRECTLY IN FRONT OF THE TOE OF ERICSSONS LEFT BOOT.  AN
 HV1860'UNMARKED POINT.
 HV1860
 HV1860                          STATION RECOVERY (1956)
 HV1860
 HV1860'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956
 HV1860'RECOVERED IN GOOD CONDITION.
 HV1860
 HV1860                          STATION RECOVERY (2004)
 HV1860
 HV1860'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2004 (DW)
 HV1860'RECOVERED IN GOOD CONDITION.
 HV1860
 HV1860                          STATION RECOVERY (2008)
 HV1860
 HV1860'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DRD)
 HV1860'RECOVERED IN GOOD CONDITION.
 HV1860
 HV1860                          STATION RECOVERY (2008)
 HV1860
 HV1860'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV1860'RECOVERED AS DESCRIBED.
 HV1860
 HV1860                          STATION RECOVERY (2010)
 HV1860
 HV1860'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 HV1860'RECOVERED IN GOOD CONDITION.
 HV1860
 HV1860                          STATION RECOVERY (2012)
 HV1860
 HV1860'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1860'RECOVERED AS DESCRIBED.
 HV1860
 HV1860                          STATION RECOVERY (2018)
 HV1860
 HV1860'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV1860'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ5414 ***********************************************************************
 AJ5414  DESIGNATION -  F 00 3 C
 AJ5414  PID         -  AJ5414
 AJ5414  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ5414  COUNTRY     -  US
 AJ5414  USGS QUAD   -  WASHINGTON WEST (2016)
 AJ5414
 AJ5414                         *CURRENT SURVEY CONTROL
 AJ5414  ______________________________________________________________________
 AJ5414* NAD 83(1986) POSITION- 38 52 33.     (N) 077 00 10.     (W)   SCALED
 AJ5414* NAVD 88 ORTHO HEIGHT -     4.809 (meters)       15.78  (feet) ADJUSTED
 AJ5414  ______________________________________________________________________
 AJ5414  GEOID HEIGHT    -        -32.166 (meters)                     GEOID18
 AJ5414  DYNAMIC HEIGHT  -          4.806 (meters)       15.77  (feet) COMP
 AJ5414  MODELED GRAVITY -    980,097.1   (mgal)                       NAVD 88
 AJ5414
 AJ5414  VERT ORDER      -  SECOND    CLASS I
 AJ5414
 AJ5414.The horizontal coordinates were scaled from a map and have
 AJ5414.an estimated accuracy of +/- 6 seconds.
 AJ5414
 AJ5414.The orthometric height was determined by differential leveling and
 AJ5414.adjusted by the NATIONAL GEODETIC SURVEY
 AJ5414.in October 2001.
 AJ5414
 AJ5414.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ5414.GEOID18 height accuracy estimate available here.
 AJ5414
 AJ5414.Click photographs - Photos may exist for this station.
 AJ5414
 AJ5414.The dynamic height is computed by dividing the NAVD 88
 AJ5414.geopotential number by the normal gravity value computed on the
 AJ5414.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ5414.degrees latitude (g = 980.6199 gals.).
 AJ5414
 AJ5414.The modeled gravity was interpolated from observed gravity values.
 AJ5414
 AJ5414
 AJ5414_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ262049(NAD 83)
 AJ5414
 AJ5414                          SUPERSEDED SURVEY CONTROL
 AJ5414
 AJ5414.No superseded survey control is available for this station.
 AJ5414
 AJ5414_MARKER: I = METAL ROD
 AJ5414_SETTING: 49 = STAINLESS STEEL ROD W/O SLEEVE (10 FT.+)
 AJ5414_MARK LOGO: NONE
 AJ5414_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ5414_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 AJ5414_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AJ5414+SATELLITE: SATELLITE OBSERVATIONS - August 06, 2001
 AJ5414
 AJ5414  HISTORY     - Date     Condition        Report By
 AJ5414  HISTORY     - 1988     MONUMENTED       DEWDAV
 AJ5414  HISTORY     - 20010806 GOOD             NGS
 AJ5414
 AJ5414                          STATION DESCRIPTION
 AJ5414
 AJ5414'DESCRIBED BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 AJ5414'TO REACH FROM THE JUNCTION OF SOUTH CAPITAL STREET AND M STREET (IN
 AJ5414'SOUTHEAST WASHINGTON DC) GO EAST ALONG M STREET FOR 0.35 MILE (0.56
 AJ5414'KM) TO ENTRANCE OF THE SOUTHEAST FEDERAL CENTER, PASS THRU SECURITY
 AJ5414'GATE TO THE FIRST ENTRANCE TO PARKING LOT ON RIGHT AND GO WEST THRU
 AJ5414'PARKING LOT TO THE MARK WHICH IS THE SMALLER ONE OF TWO MANHOLE COVERS
 AJ5414'SET FLUSH WITH PARKING SURFACE, ACCESS IS THRU MANHOLE COVER
 AJ5414'SURROUNDED BY A BROKEN MASS OF CONCRETE.  MARK IS A SMALL STEEL BALL
 AJ5414'ON A ROD ENCASED IN A SLEEVE.  237.8 FEET (72.5 M) WEST OF CENTERLINE
 AJ5414'OF ENTRANCE ROAD.  129.5 FEET (39.5 M) SOUTHWEST OF 8 FOOT (2.4 M)
 AJ5414'CHAIN LINK FENCE.  58.0 FEET (17.7 M) NORTHWEST OF LIGHT POLE WITH TWO
 AJ5414'LIGHTS NO L-4-4.  17.3 FEET (5.3 M) EAST OF EAST EDGE OF CURB.  13.3
 AJ5414'FEET (4.1 M) SOUTHWEST OF LARGE MAN HOLE COVER. NOTE--ROD DEPTH IS
 AJ5414'UNKNOWN.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1864 ***********************************************************************
 HV1864  DESIGNATION -  F 1
 HV1864  PID         -  HV1864
 HV1864  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1864  COUNTRY     -  US
 HV1864  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1864
 HV1864                         *CURRENT SURVEY CONTROL
 HV1864  ______________________________________________________________________
 HV1864* NAD 83(1986) POSITION- 38 53 51.     (N) 077 03 04.     (W)   SCALED
 HV1864* NAVD 88 ORTHO HEIGHT -     9.749 (meters)       31.98  (feet) ADJUSTED
 HV1864  ______________________________________________________________________
 HV1864  GEOID HEIGHT    -        -32.054 (meters)                     GEOID18
 HV1864  DYNAMIC HEIGHT  -          9.743 (meters)       31.97  (feet) COMP
 HV1864  MODELED GRAVITY -    980,095.2   (mgal)                       NAVD 88
 HV1864
 HV1864  VERT ORDER      -  FIRST     CLASS II
 HV1864
 HV1864.The horizontal coordinates were scaled from a map and have
 HV1864.an estimated accuracy of +/- 6 seconds.
 HV1864
 HV1864.The orthometric height was determined by differential leveling and
 HV1864.adjusted by the NATIONAL GEODETIC SURVEY
 HV1864.in June 1991.
 HV1864
 HV1864.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1864.GEOID18 height accuracy estimate available here.
 HV1864
 HV1864.Click photographs - Photos may exist for this station.
 HV1864
 HV1864.The dynamic height is computed by dividing the NAVD 88
 HV1864.geopotential number by the normal gravity value computed on the
 HV1864.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1864.degrees latitude (g = 980.6199 gals.).
 HV1864
 HV1864.The modeled gravity was interpolated from observed gravity values.
 HV1864
 HV1864
 HV1864_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ221074(NAD 83)
 HV1864
 HV1864                          SUPERSEDED SURVEY CONTROL
 HV1864
 HV1864  NGVD 29 (11/26/84)    9.975  (m)           32.73   (f) ADJUSTED    1 2
 HV1864
 HV1864.Superseded values are not recommended for survey control.
 HV1864
 HV1864.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1864.See file dsdata.pdf to determine how the superseded data were derived.
 HV1864
 HV1864_MARKER: DB = BENCH MARK DISK
 HV1864_SETTING: 0 = UNSPECIFIED SETTING
 HV1864_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1864
 HV1864  HISTORY     - Date     Condition        Report By
 HV1864  HISTORY     - 1914     MONUMENTED       CGS
 HV1864
 HV1864                          STATION DESCRIPTION
 HV1864
 HV1864'DESCRIBED BY COAST AND GEODETIC SURVEY 1914
 HV1864'IN WASHINGTON.
 HV1864'ON THE NORTHEAST CORNER OF TWENTY-SIXTH AND G STREETS, N.W. 3/4
 HV1864'FOOT SOUTH OF THE NORTHWEST CORNER OF THE OFFICE OF THE
 HV1864'WASHINGTON GAS COMPANY, 3 1/2 FEET ABOVE THE SIDEWALK ON
 HV1864'TWENTY-SIXTH STREET.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1865 ***********************************************************************
 HV1865  DESIGNATION -  F 1 RESET
 HV1865  PID         -  HV1865
 HV1865  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1865  COUNTRY     -  US
 HV1865  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1865
 HV1865                         *CURRENT SURVEY CONTROL
 HV1865  ______________________________________________________________________
 HV1865* NAD 83(1986) POSITION- 38 53 51.30   (N) 077 03 03.96   (W)   HD_HELD1
 HV1865* NAVD 88 ORTHO HEIGHT -    18.035 (meters)       59.17  (feet) ADJUSTED
 HV1865  ______________________________________________________________________
 HV1865  GEOID HEIGHT    -        -32.053 (meters)                     GEOID18
 HV1865  DYNAMIC HEIGHT  -         18.025 (meters)       59.14  (feet) COMP
 HV1865  MODELED GRAVITY -    980,095.1   (mgal)                       NAVD 88
 HV1865
 HV1865  VERT ORDER      -  FIRST     CLASS II
 HV1865
 HV1865.The horizontal coordinates were determined by differentially corrected
 HV1865.hand held GPS observations or other comparable positioning techniques
 HV1865.and have an estimated accuracy of +/- 3 meters.
 HV1865
 HV1865.The orthometric height was determined by differential leveling and
 HV1865.adjusted by the NATIONAL GEODETIC SURVEY
 HV1865.in June 1991.
 HV1865
 HV1865.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1865.GEOID18 height accuracy estimate available here.
 HV1865
 HV1865.Click photographs - Photos may exist for this station.
 HV1865
 HV1865.The dynamic height is computed by dividing the NAVD 88
 HV1865.geopotential number by the normal gravity value computed on the
 HV1865.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1865.degrees latitude (g = 980.6199 gals.).
 HV1865
 HV1865.The modeled gravity was interpolated from observed gravity values.
 HV1865
 HV1865
 HV1865_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2212707411(NAD 83)
 HV1865
 HV1865                          SUPERSEDED SURVEY CONTROL
 HV1865
 HV1865  NGVD 29 (??/??/??)   18.27   (m)           59.9    (f) RESET       3  
 HV1865
 HV1865.Superseded values are not recommended for survey control.
 HV1865
 HV1865.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1865.See file dsdata.pdf to determine how the superseded data were derived.
 HV1865
 HV1865_MARKER: DB = BENCH MARK DISK
 HV1865_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1865_SP_SET: UNDERPASS WALL
 HV1865_STAMPING: F 1 RESET 1949
 HV1865_MARK LOGO: CGS
 HV1865_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1865
 HV1865  HISTORY     - Date     Condition        Report By
 HV1865  HISTORY     - 1949     MONUMENTED       CGS
 HV1865  HISTORY     - 1979     GOOD             NGS
 HV1865
 HV1865                          STATION DESCRIPTION
 HV1865
 HV1865'DESCRIBED BY COAST AND GEODETIC SURVEY 1949
 HV1865'AT WASHINGTON.
 HV1865'AT WASHINGTON, NEAR THE INTERSECTION OF TWENTY-FOURTH STREET AND
 HV1865'VIRGINIA AVENUE NORTHWEST, 100 FEET SOUTHEAST OF THE CENTERLINE
 HV1865'OF TWENTY-FOURTH STREET, 20 FEET NORTHEAST OF THE SOUTHWEST CURB
 HV1865'OF VIRGINIA AVENUE, AT THE WEST END OF THE UNDERPASS THAT CARRIES
 HV1865'VIRGINIA AVENUE UNDER TWENTY-THIRD STREET, AND IN THE TOP OF THE
 HV1865'SOUTHWEST WALL.  A STANDARD DISK, STAMPED F 1 RESET 1949.
 HV1865'NOTE-- TIDAL STA. PREVIOUSLY DESIGNATED F 1 RESET 1949=RCPP
 HV1865'2=TIDAL MARK.
 HV1865
 HV1865                          STATION RECOVERY (1979)
 HV1865
 HV1865'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1865'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1818 ***********************************************************************
 HV1818  DESIGNATION -  F 2
 HV1818  PID         -  HV1818
 HV1818  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1818  COUNTRY     -  US
 HV1818  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1818
 HV1818                         *CURRENT SURVEY CONTROL
 HV1818  ______________________________________________________________________
 HV1818* NAD 83(1986) POSITION- 38 55 29.     (N) 077 06 26.     (W)   SCALED
 HV1818* NAVD 88 ORTHO HEIGHT -    16.963 (meters)       55.65  (feet) ADJUSTED
 HV1818  ______________________________________________________________________
 HV1818  GEOID HEIGHT    -        -31.935 (meters)                     GEOID18
 HV1818  DYNAMIC HEIGHT  -         16.954 (meters)       55.62  (feet) COMP
 HV1818  MODELED GRAVITY -    980,091.5   (mgal)                       NAVD 88
 HV1818
 HV1818  VERT ORDER      -  FIRST     CLASS II
 HV1818
 HV1818.The horizontal coordinates were scaled from a map and have
 HV1818.an estimated accuracy of +/- 6 seconds.
 HV1818
 HV1818.The orthometric height was determined by differential leveling and
 HV1818.adjusted by the NATIONAL GEODETIC SURVEY
 HV1818.in June 1991.
 HV1818
 HV1818.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1818.GEOID18 height accuracy estimate available here.
 HV1818
 HV1818.Click photographs - Photos may exist for this station.
 HV1818
 HV1818.The dynamic height is computed by dividing the NAVD 88
 HV1818.geopotential number by the normal gravity value computed on the
 HV1818.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1818.degrees latitude (g = 980.6199 gals.).
 HV1818
 HV1818.The modeled gravity was interpolated from observed gravity values.
 HV1818
 HV1818
 HV1818_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ173105(NAD 83)
 HV1818
 HV1818                          SUPERSEDED SURVEY CONTROL
 HV1818
 HV1818  NGVD 29 (11/26/84)   17.188  (m)           56.39   (f) ADJUSTED    1 2
 HV1818
 HV1818.Superseded values are not recommended for survey control.
 HV1818
 HV1818.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1818.See file dsdata.pdf to determine how the superseded data were derived.
 HV1818
 HV1818_MARKER: DB = BENCH MARK DISK
 HV1818_SETTING: 38 = SET IN THE ABUTMENT OR PIER OF A LARGE BRIDGE
 HV1818_SP_SET: PIER
 HV1818_STAMPING: F 2 1933
 HV1818_MARK LOGO: CGS
 HV1818_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV1818_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1818_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1818+SATELLITE: SATELLITE OBSERVATIONS - March 29, 1990
 HV1818
 HV1818  HISTORY     - Date     Condition        Report By
 HV1818  HISTORY     - 1933     MONUMENTED       CGS
 HV1818  HISTORY     - 1933     GOOD             CGS
 HV1818  HISTORY     - 1947     GOOD             CGS
 HV1818  HISTORY     - 19900329 GOOD             NGS
 HV1818  HISTORY     - 19920129 GOOD             MSI
 HV1818
 HV1818                          STATION DESCRIPTION
 HV1818
 HV1818'DESCRIBED BY COAST AND GEODETIC SURVEY 1933
 HV1818'2.8 MI NW FROM GEORGETOWN.
 HV1818'2.8 MILES NORTHWEST ALONG THE GEORGETOWN BRANCH OF THE BALTIMORE
 HV1818'AND OHIO RAILROAD FROM KEY BRIDGE AT GEORGETOWN, D.C., 100 FEET
 HV1818'SOUTHWEST OF THE INTERSECTION OF CANAL ROAD AND WEAVER PLACE,
 HV1818'29 FEET SOUTH OF THE CENTERLINE OF CANAL ROAD, 10 FEET NORTH OF
 HV1818'THE NORTH SIDE OF THE CHESAPEAKE AND OHIO CANAL, AT A STEEL BRIDGE
 HV1818'OVER THE HIGHWAY AND THE CANAL, IN THE SOUTHWEST END OF THE
 HV1818'CONCRETE PIER, 12 FEET SOUTHWEST OF THE CENTERLINE OF THE TRACK,
 HV1818'AND ABOUT 4-1/2 FEET BELOW THE TOP OF THE RAIL.  A STANDARD
 HV1818'DISK, STAMPED F 2.
 HV1818
 HV1818                          STATION RECOVERY (1947)
 HV1818
 HV1818'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947
 HV1818'RECOVERED IN GOOD CONDITION.
 HV1818
 HV1818                          STATION RECOVERY (1990)
 HV1818
 HV1818'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990
 HV1818'IN WASHINGTON DC, AT THE INTERSECTION OF CANAL ROAD AND ARIZONA AVENUE
 HV1818', NEAR THE CENTER OF THE WEST LEG OF A L-SHAPED CONCRETE PIER OF A
 HV1818'ABANDONED RAILROAD OVERPASS, 16.7 M (54.79 FT) NORTHWEST OF THE
 HV1818'EXTENDED CENTER OF THE AVENUE, 8.0 M (26.25 FT) SOUTHWEST OF THE
 HV1818'CENTER OF THE ROAD, 4.7 M (15.42 FT) ABOVE THE LEVEL OF THE ROAD, 3.1
 HV1818'M (10.17 FT) WEST OF THE NEAR RAIL, AND 1.3 M (4.27 FT) BELOW THE
 HV1818'LEVEL OF THE TRACKS.
 HV1818
 HV1818                          STATION RECOVERY (1992)
 HV1818
 HV1818'RECOVERY NOTE BY MEASUREMENT SCIENCE INCORPORATED 1992
 HV1818'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ5423 ***********************************************************************
 AJ5423  DESIGNATION -  F 305
 AJ5423  PID         -  AJ5423
 AJ5423  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ5423  COUNTRY     -  US
 AJ5423  USGS QUAD   -  ANACOSTIA (2016)
 AJ5423
 AJ5423                         *CURRENT SURVEY CONTROL
 AJ5423  ______________________________________________________________________
 AJ5423* NAD 83(1986) POSITION- 38 51 54.     (N) 076 59 54.     (W)   SCALED
 AJ5423* NAVD 88 ORTHO HEIGHT -     1.971 (meters)        6.47  (feet) ADJUSTED
 AJ5423  ______________________________________________________________________
 AJ5423  GEOID HEIGHT    -        -32.191 (meters)                     GEOID18
 AJ5423  DYNAMIC HEIGHT  -          1.970 (meters)        6.46  (feet) COMP
 AJ5423  MODELED GRAVITY -    980,094.3   (mgal)                       NAVD 88
 AJ5423
 AJ5423  VERT ORDER      -  SECOND    CLASS I
 AJ5423
 AJ5423.The horizontal coordinates were scaled from a map and have
 AJ5423.an estimated accuracy of +/- 6 seconds.
 AJ5423
 AJ5423.The orthometric height was determined by differential leveling and
 AJ5423.adjusted by the NATIONAL GEODETIC SURVEY
 AJ5423.in October 2001.
 AJ5423
 AJ5423.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ5423.GEOID18 height accuracy estimate available here.
 AJ5423
 AJ5423.Click photographs - Photos may exist for this station.
 AJ5423
 AJ5423.The dynamic height is computed by dividing the NAVD 88
 AJ5423.geopotential number by the normal gravity value computed on the
 AJ5423.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ5423.degrees latitude (g = 980.6199 gals.).
 AJ5423
 AJ5423.The modeled gravity was interpolated from observed gravity values.
 AJ5423
 AJ5423
 AJ5423_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ266036(NAD 83)
 AJ5423
 AJ5423                          SUPERSEDED SURVEY CONTROL
 AJ5423
 AJ5423.No superseded survey control is available for this station.
 AJ5423
 AJ5423_MARKER: DD = SURVEY DISK
 AJ5423_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 AJ5423_STAMPING: F 305
 AJ5423_MARK LOGO: WMATA
 AJ5423_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ5423_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AJ5423+STABILITY: SURFACE MOTION
 AJ5423_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AJ5423+SATELLITE: SATELLITE OBSERVATIONS - August 06, 2001
 AJ5423
 AJ5423  HISTORY     - Date     Condition        Report By
 AJ5423  HISTORY     - UNK      MONUMENTED       DEWDAV
 AJ5423  HISTORY     - 20010806 GOOD             NGS
 AJ5423
 AJ5423                          STATION DESCRIPTION
 AJ5423
 AJ5423'DESCRIBED BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 AJ5423'FROM INTERSTATE 295 SOUTH AND HOWARD ROAD EXIT (3B) IN WASHINGTON DC,
 AJ5423'GO 0.15 MILE (0.24 KM) SOUTHWEST ON EXIT RAMP TO THE JUNCTION OF
 AJ5423'HOWARD ROAD, THENCE 0.05 M (0.16 FT) EASTERLY ALONG HOWARD ROAD TO A
 AJ5423'DRIVEWAY FOR APARTMENT BUILDINGS, THENCE 0.05 M (0.16 FT) NORTHERLY
 AJ5423'DOWN DRIVEWAY AND THROUGH A BROKEN FENCE TO MARK AT A T JUNCTION ON
 AJ5423'RIGHT, 8.0 FEET (2.4 M) EAST OF CENTERLINE OF AN ABANDONED ASPHALT
 AJ5423'ROAD, 39.0 FEET (11.9 M) SOUTHEAST OF A STEEL CORNER POST FOR A CHAIN
 AJ5423'LINK FENCE, 28.0 FEET (8.5 M) SOUTHEAST OF CENTER OF T JUNCTION AND
 AJ5423'30.0 FEET (9.1 M) EAST-SOUTHEAST OF A STEEL CORNER POST FOR A CHAIN
 AJ5423'LINK FENCE.  MARK IS 1 INCH BELOW GROUND LEVEL AND FLUSH WITH ASPHALT
 AJ5423'ROAD.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ5422 ***********************************************************************
 AJ5422  DESIGNATION -  F 307 RXD
 AJ5422  PID         -  AJ5422
 AJ5422  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ5422  COUNTRY     -  US
 AJ5422  USGS QUAD   -  ANACOSTIA (2016)
 AJ5422
 AJ5422                         *CURRENT SURVEY CONTROL
 AJ5422  ______________________________________________________________________
 AJ5422* NAD 83(1986) POSITION- 38 51 50.     (N) 076 59 52.     (W)   SCALED
 AJ5422* NAVD 88 ORTHO HEIGHT -     5.490 (meters)       18.01  (feet) ADJUSTED
 AJ5422  ______________________________________________________________________
 AJ5422  GEOID HEIGHT    -        -32.194 (meters)                     GEOID18
 AJ5422  DYNAMIC HEIGHT  -          5.487 (meters)       18.00  (feet) COMP
 AJ5422  MODELED GRAVITY -    980,093.9   (mgal)                       NAVD 88
 AJ5422
 AJ5422  VERT ORDER      -  SECOND    CLASS I
 AJ5422
 AJ5422.The horizontal coordinates were scaled from a map and have
 AJ5422.an estimated accuracy of +/- 6 seconds.
 AJ5422
 AJ5422.The orthometric height was determined by differential leveling and
 AJ5422.adjusted by the NATIONAL GEODETIC SURVEY
 AJ5422.in October 2001.
 AJ5422
 AJ5422.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ5422.GEOID18 height accuracy estimate available here.
 AJ5422
 AJ5422.Click photographs - Photos may exist for this station.
 AJ5422
 AJ5422.The dynamic height is computed by dividing the NAVD 88
 AJ5422.geopotential number by the normal gravity value computed on the
 AJ5422.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ5422.degrees latitude (g = 980.6199 gals.).
 AJ5422
 AJ5422.The modeled gravity was interpolated from observed gravity values.
 AJ5422
 AJ5422
 AJ5422_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ266035(NAD 83)
 AJ5422
 AJ5422                          SUPERSEDED SURVEY CONTROL
 AJ5422
 AJ5422.No superseded survey control is available for this station.
 AJ5422
 AJ5422_MARKER: DD = SURVEY DISK
 AJ5422_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 AJ5422_SP_SET: SIDEWALK
 AJ5422_STAMPING: F 307 RXD
 AJ5422_MARK LOGO: WMATA
 AJ5422_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ5422_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 AJ5422
 AJ5422  HISTORY     - Date     Condition        Report By
 AJ5422  HISTORY     - UNK      MONUMENTED       NONE
 AJ5422  HISTORY     - 20010806 POOR             NGS
 AJ5422
 AJ5422                          STATION DESCRIPTION
 AJ5422
 AJ5422'DESCRIBED BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 AJ5422'TO REACH FROM INTERSTATE 295 SOUTH AND HOWARD ROAD EXIT (3B) (IN
 AJ5422'WASHINGTON DC) GO SW FOR 0.15 MILE (0.24 KM) ON EXIT RAMP (STAY IN
 AJ5422'RIGHT LANE) TO T JUNCTION OF HOWARD ROAD AND MARK ON THE RIGHT IN
 AJ5422'CURB.  31.5 FEET (9.6 M) NORTHEAST OF CENTERLINE OF HOWARD ROAD. 19.0
 AJ5422'FEET (5.8 M) SOUTHEAST OF CENTERLINE OF BLACK TOP ROAD LEADING TO
 AJ5422'METRO STATION.  21.1 FEET (6.4 M) NORTHWEST OF A PLP WITH ONE GUY WIRE
 AJ5422'AND 3 SIGNAL LIGHTS.  2.3 FEET (0.7 M) SOUTHEAST OF CURB EDGE.
 AJ5422'NOTE--THERE IS A 2 FOOT (0.6 M) LONG CRACK IN CONCRETE ON NORTHWEST
 AJ5422'SIDE OF BM.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ5413 ***********************************************************************
 AJ5413  DESIGNATION -  F 4 A 144+00
 AJ5413  PID         -  AJ5413
 AJ5413  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ5413  COUNTRY     -  US
 AJ5413  USGS QUAD   -  ANACOSTIA (2016)
 AJ5413
 AJ5413                         *CURRENT SURVEY CONTROL
 AJ5413  ______________________________________________________________________
 AJ5413* NAD 83(1986) POSITION- 38 52 28.     (N) 076 59 59.     (W)   SCALED
 AJ5413* NAVD 88 ORTHO HEIGHT -     2.131 (meters)        6.99  (feet) ADJUSTED
 AJ5413  ______________________________________________________________________
 AJ5413  GEOID HEIGHT    -        -32.173 (meters)                     GEOID18
 AJ5413  DYNAMIC HEIGHT  -          2.130 (meters)        6.99  (feet) COMP
 AJ5413  MODELED GRAVITY -    980,096.4   (mgal)                       NAVD 88
 AJ5413
 AJ5413  VERT ORDER      -  SECOND    CLASS I
 AJ5413
 AJ5413.The horizontal coordinates were scaled from a map and have
 AJ5413.an estimated accuracy of +/- 6 seconds.
 AJ5413
 AJ5413.The orthometric height was determined by differential leveling and
 AJ5413.adjusted by the NATIONAL GEODETIC SURVEY
 AJ5413.in October 2001.
 AJ5413
 AJ5413.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ5413.GEOID18 height accuracy estimate available here.
 AJ5413
 AJ5413.Click photographs - Photos may exist for this station.
 AJ5413
 AJ5413.The dynamic height is computed by dividing the NAVD 88
 AJ5413.geopotential number by the normal gravity value computed on the
 AJ5413.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ5413.degrees latitude (g = 980.6199 gals.).
 AJ5413
 AJ5413.The modeled gravity was interpolated from observed gravity values.
 AJ5413
 AJ5413
 AJ5413_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ265047(NAD 83)
 AJ5413
 AJ5413                          SUPERSEDED SURVEY CONTROL
 AJ5413
 AJ5413.No superseded survey control is available for this station.
 AJ5413
 AJ5413_MARKER: Z = SEE DESCRIPTION
 AJ5413_SETTING: 0 = UNSPECIFIED SETTING
 AJ5413_MARK LOGO: NONE
 AJ5413_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ5413_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 AJ5413
 AJ5413  HISTORY     - Date     Condition        Report By
 AJ5413  HISTORY     - UNK      MONUMENTED       NONE
 AJ5413  HISTORY     - 20010806 GOOD             NGS
 AJ5413
 AJ5413                          STATION DESCRIPTION
 AJ5413
 AJ5413'DESCRIBED BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 AJ5413'0.3 MILE (0.5 KM) EAST ALONG M STREET FROM THE NORTHBOUND LANES OF
 AJ5413'SOUTH CAPITOL BLVD TO INTERSECTION OF 2ND STREET, THENCE 0.1 MILE (0.2
 AJ5413'KM) SOUTH PASSING THROUGH GUARD HOUSE TO THE INTERSECTION OF TINGLEY
 AJ5413'STREET, THENCE EAST ALONG TINGLEY STREET FOR 0.1 MILE (0.2 KM) TO
 AJ5413'BUILDING NUMBER 118 ON RIGHT AND PENDLETON AVENUE, THENCE 208.0 FEET
 AJ5413'(63.4 M) SOUTH ALONG PENDLETON AVENUE FROM THE CENTERLINE OF TINGLEY
 AJ5413'STREET TO MARK ON LEFT.  20.2 FEET (6.2 M) EAST OF CENTERLINE OF
 AJ5413'PENDLETON AVENUE, 11.7 FEET (3.6 M) WEST OF THE BOTTOM STEP FOR
 AJ5413'BUILDING, AND 5.2 FEET (1.6 M) SOUTHEAST OF SOUTHWEST CORNER OF
 AJ5413'BUILDING NUMBER 118.  ACCESS TO MARK IS THROUGH A SMALL ROUND CAST
 AJ5413'IRON COVER AND HIGH POINT BEING A 1/2 IRON BALL RECESSED IN A CASING 1
 AJ5413'INCH BELOW GROUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ5442 ***********************************************************************
 AJ5442  DESIGNATION -  F 4 A 169 RESET
 AJ5442  PID         -  AJ5442
 AJ5442  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ5442  COUNTRY     -  US
 AJ5442  USGS QUAD   -  ANACOSTIA (2016)
 AJ5442
 AJ5442                         *CURRENT SURVEY CONTROL
 AJ5442  ______________________________________________________________________
 AJ5442* NAD 83(1986) POSITION- 38 52 03.20   (N) 076 59 48.63   (W)   HD_HELD1
 AJ5442* NAVD 88 ORTHO HEIGHT -     4.830 (meters)       15.85  (feet) ADJUSTED
 AJ5442  ______________________________________________________________________
 AJ5442  GEOID HEIGHT    -        -32.190 (meters)                     GEOID18
 AJ5442  DYNAMIC HEIGHT  -          4.827 (meters)       15.84  (feet) COMP
 AJ5442  MODELED GRAVITY -    980,094.8   (mgal)                       NAVD 88
 AJ5442
 AJ5442  VERT ORDER      -  SECOND    CLASS I
 AJ5442
 AJ5442.The horizontal coordinates were determined by differentially corrected
 AJ5442.hand held GPS observations or other comparable positioning techniques
 AJ5442.and have an estimated accuracy of +/- 3 meters.
 AJ5442
 AJ5442.The orthometric height was determined by differential leveling and
 AJ5442.adjusted by the NATIONAL GEODETIC SURVEY
 AJ5442.in October 2001.
 AJ5442
 AJ5442.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ5442.GEOID18 height accuracy estimate available here.
 AJ5442
 AJ5442.Click photographs - Photos may exist for this station.
 AJ5442
 AJ5442.The dynamic height is computed by dividing the NAVD 88
 AJ5442.geopotential number by the normal gravity value computed on the
 AJ5442.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ5442.degrees latitude (g = 980.6199 gals.).
 AJ5442
 AJ5442.The modeled gravity was interpolated from observed gravity values.
 AJ5442
 AJ5442
 AJ5442_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2676003974(NAD 83)
 AJ5442
 AJ5442                          SUPERSEDED SURVEY CONTROL
 AJ5442
 AJ5442.No superseded survey control is available for this station.
 AJ5442
 AJ5442_MARKER: DD = SURVEY DISK
 AJ5442_SETTING: 41 = SET IN A LARGE STRUCTURE WITH FOUNDATIONS ON BEDROCK
 AJ5442_SP_SET: AIR SHAFT FOUNDATION
 AJ5442_STAMPING: F 4 A BM 169 R
 AJ5442_MARK LOGO: WMATA
 AJ5442_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ5442_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 AJ5442+STABILITY: POSITION/ELEVATION WELL
 AJ5442_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AJ5442+SATELLITE: SATELLITE OBSERVATIONS - July 06, 2016
 AJ5442
 AJ5442  HISTORY     - Date     Condition        Report By
 AJ5442  HISTORY     - 2001     MONUMENTED       WMATA
 AJ5442  HISTORY     - 20110116 GOOD             NGS
 AJ5442  HISTORY     - 20160706 GOOD             JMTMD
 AJ5442
 AJ5442                          STATION DESCRIPTION
 AJ5442
 AJ5442'DESCRIBED BY WASH METRO TRANSIT 2001 (CAR)
 AJ5442'FROM INTERSTATE 295 SOUTH AND HOWARD ROAD EXIT (3B) IN WASHINGTON DC
 AJ5442'GO SOUTHWEST 0.15 MILE (0.24 KM) ON EXIT RAMP (STAY IN RIGHT LANE) TO
 AJ5442'JUNCTION OF HOWARD ROAD, THENCE RIGHT IN RIGHT LANE FOR 0.20 MILE
 AJ5442'(0.32 KM) ALONG HOWARD ROAD TO A Y JUNCTION WITH FLASHING YELLOW
 AJ5442'LIGHT, THENCE RIGHT ALONG A BLACK TOP ROAD FOR 0.20 MILE (0.32 KM) FOR
 AJ5442'THE ENTRANCE TO ANACOSTIA PARK TO A T JUNCTION, THENCE 0.15 MILE (0.24
 AJ5442'KM) EAST ALONG ANACOSTIA ROAD TO A LARGE AIR DUCT ON RIGHT, THENCE
 AJ5442'SOUTH ACROSS FIELD FOR 0.1 MILE (0.16 KM) TO MARK ON LEFT SIDE OF A
 AJ5442'20.6 FOOT (6.3 M) BY 6.4 FOOT (2.0 M) CONCRETE RETAINING WALL FOR A
 AJ5442'AIR DUCT FOR METRO TRAIN.  90.3 FEET (27.5 M) EAST-SOUTHEAST OF A
 AJ5442'CHAIN LINK FENCE, 0.8 FEET (24.4 CM) ABOVE GROUND LEVEL. NOTE--THE AIR
 AJ5442'DUCT WALL IS 100.0 FEET DEEP.
 AJ5442
 AJ5442                          STATION RECOVERY (2011)
 AJ5442
 AJ5442'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2011 (DRD)
 AJ5442'RECOVERED IN GOOD CONDITION.
 AJ5442
 AJ5442                          STATION RECOVERY (2016)
 AJ5442
 AJ5442'RECOVERY NOTE BY JMT ENGINEERING 2016 (JLS)
 AJ5442'USED FOR STATIC GPS WITH HV8868 AND HV9275
 AJ5442'MD SPC NAD82(2011) USFT N 437340.24 E 1313239.19
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV0873 ***********************************************************************
 HV0873  DESIGNATION -  F 5
 HV0873  PID         -  HV0873
 HV0873  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV0873  COUNTRY     -  US
 HV0873  USGS QUAD   -  WASHINGTON EAST (2016)
 HV0873
 HV0873                         *CURRENT SURVEY CONTROL
 HV0873  ______________________________________________________________________
 HV0873* NAD 83(1986) POSITION- 38 52 44.7    (N) 076 58 52.6    (W)   HD_HELD2
 HV0873* NAVD 88 ORTHO HEIGHT -    13.138 (meters)       43.10  (feet) ADJUSTED
 HV0873  ______________________________________________________________________
 HV0873  GEOID HEIGHT    -        -32.197 (meters)                     GEOID18
 HV0873  DYNAMIC HEIGHT  -         13.131 (meters)       43.08  (feet) COMP
 HV0873  MODELED GRAVITY -    980,095.3   (mgal)                       NAVD 88
 HV0873
 HV0873  VERT ORDER      -  FIRST     CLASS II
 HV0873
 HV0873.The horizontal coordinates were established by autonomous hand held GPS
 HV0873.observations and have an estimated accuracy of +/- 10 meters.
 HV0873
 HV0873.The orthometric height was determined by differential leveling and
 HV0873.adjusted by the NATIONAL GEODETIC SURVEY
 HV0873.in August 2020.
 HV0873
 HV0873.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV0873.GEOID18 height accuracy estimate available here.
 HV0873
 HV0873.Click photographs - Photos may exist for this station.
 HV0873
 HV0873.The dynamic height is computed by dividing the NAVD 88
 HV0873.geopotential number by the normal gravity value computed on the
 HV0873.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV0873.degrees latitude (g = 980.6199 gals.).
 HV0873
 HV0873.The modeled gravity was interpolated from observed gravity values.
 HV0873
 HV0873
 HV0873_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2813805224(NAD 83)
 HV0873
 HV0873                          SUPERSEDED SURVEY CONTROL
 HV0873
 HV0873  NAVD 88 (06/15/91)   13.124  (m)           43.06   (f) SUPERSEDED  1 1
 HV0873  NGVD 29 (11/26/84)   13.362  (m)           43.84   (f) ADJUSTED    1 1
 HV0873
 HV0873.Superseded values are not recommended for survey control.
 HV0873
 HV0873.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV0873.See file dsdata.pdf to determine how the superseded data were derived.
 HV0873
 HV0873_MARKER: DB = BENCH MARK DISK
 HV0873_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV0873_SP_SET: BRIDGE
 HV0873_STAMPING: F 5 1971
 HV0873_MARK LOGO: CGS
 HV0873_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV0873_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV0873+SATELLITE: SATELLITE OBSERVATIONS - January 13, 2020
 HV0873
 HV0873  HISTORY     - Date     Condition        Report By
 HV0873  HISTORY     - 1971     MONUMENTED       NGS
 HV0873  HISTORY     - 20200113 GOOD             ARCSHE
 HV0873
 HV0873                          STATION DESCRIPTION
 HV0873
 HV0873'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV0873'AT WASHINGTON.
 HV0873'AT WASHINGTON, D.C., ABOUT 1.4 MILES SOUTHEAST ALONG PENNSYLVANIA
 HV0873'AVENUE FROM THE JUNCTION OF INDEPENDENCE AVENUE, 0.4 MILE
 HV0873'NORTHWEST OF THE SOUTHEAST END OF THE PENNSYLVANIA AVENUE BRIDGE
 HV0873'(JOHN PHILIP SOUSA BRIDGE) OVER THE ANACOSTIA RIVER, AT THE
 HV0873'JUNCTION OF THE AVENUE, KENTUCKY AVENUE AND BARNEY CIRCLE, SET
 HV0873'IN THE TOP AND 1.4 FEET NORTHEAST OF THE SOUTHWEST END OF THE
 HV0873'CONCRETE RETAINING WALL ON THE NORTHWEST SIDE OF AN AVENUE
 HV0873'OVERPASS, 95 FEET NORTH AND ACROSS KENTUCKY AVENUE FROM THE
 HV0873'CENTER LINE OF THE NORTHEAST LANES OF PENNSYLVANIA AVENUE, 43
 HV0873'FEET SOUTHEAST OF THE CENTER LINE OF BARNEY CIRCLE, 22 FEET
 HV0873'NORTHEAST OF THE CENTER LINE OF KENTUCKY AVENUE, 1.5 FEET
 HV0873'BELOW THE TOP OF THE GRANITE BASE FOR THE METAL GUARDRAIL ON
 HV0873'THE OVERPASS, AND ABOUT 1 FOOT ABOVE THE LEVEL OF KENTUCKY
 HV0873'AVENUE.
 HV0873
 HV0873                          STATION RECOVERY (2020)
 HV0873
 HV0873'RECOVERY NOTE BY ARCHER-SHEE LAND SURVEYING 2020 (MRA)
 HV0873'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ5443 ***********************************************************************
 AJ5443  DESIGNATION -  F 70
 AJ5443  PID         -  AJ5443
 AJ5443  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ5443  COUNTRY     -  US
 AJ5443  USGS QUAD   -  ANACOSTIA (2016)
 AJ5443
 AJ5443                         *CURRENT SURVEY CONTROL
 AJ5443  ______________________________________________________________________
 AJ5443* NAD 83(1986) POSITION- 38 52 06.     (N) 076 59 23.     (W)   SCALED
 AJ5443* NAVD 88 ORTHO HEIGHT -     2.533 (meters)        8.31  (feet) ADJUSTED
 AJ5443  ______________________________________________________________________
 AJ5443  GEOID HEIGHT    -        -32.200 (meters)                     GEOID18
 AJ5443  DYNAMIC HEIGHT  -          2.532 (meters)        8.31  (feet) COMP
 AJ5443  MODELED GRAVITY -    980,093.9   (mgal)                       NAVD 88
 AJ5443
 AJ5443  VERT ORDER      -  SECOND    CLASS I
 AJ5443
 AJ5443.The horizontal coordinates were scaled from a map and have
 AJ5443.an estimated accuracy of +/- 6 seconds.
 AJ5443
 AJ5443.The orthometric height was determined by differential leveling and
 AJ5443.adjusted by the NATIONAL GEODETIC SURVEY
 AJ5443.in October 2001.
 AJ5443
 AJ5443.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ5443.GEOID18 height accuracy estimate available here.
 AJ5443
 AJ5443.Click photographs - Photos may exist for this station.
 AJ5443
 AJ5443.The dynamic height is computed by dividing the NAVD 88
 AJ5443.geopotential number by the normal gravity value computed on the
 AJ5443.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ5443.degrees latitude (g = 980.6199 gals.).
 AJ5443
 AJ5443.The modeled gravity was interpolated from observed gravity values.
 AJ5443
 AJ5443
 AJ5443_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ273040(NAD 83)
 AJ5443
 AJ5443                          SUPERSEDED SURVEY CONTROL
 AJ5443
 AJ5443.No superseded survey control is available for this station.
 AJ5443
 AJ5443_MARKER: DD = SURVEY DISK
 AJ5443_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 AJ5443_SP_SET: SIDEWALK
 AJ5443_STAMPING: F 70
 AJ5443_MARK LOGO: WMATA
 AJ5443_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ5443_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 AJ5443
 AJ5443  HISTORY     - Date     Condition        Report By
 AJ5443  HISTORY     - UNK      MONUMENTED       WMATA
 AJ5443  HISTORY     - 20010806 GOOD             NGS
 AJ5443
 AJ5443                          STATION DESCRIPTION
 AJ5443
 AJ5443'DESCRIBED BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 AJ5443'FROM INTERSTATE 295 SOUTH AND HOWARD ROAD EXIT (3B) IN WASHINGTON DC
 AJ5443'GO SOUTHWEST 0.15 MILE (0.24 KM) ON EXIT RAMP (STAY IN RIGHT LANE) TO
 AJ5443'JUNCTION OF HOWARD ROAD, THENCE RIGHT IN RIGHT LANE FOR 0.20 MILE
 AJ5443'(0.32 KM) ALONG HOWARD ROAD TO A Y JUNCTION WITH FLASHING YELLOW
 AJ5443'LIGHT, THENCE RIGHT ALONG A BLACK TOP ROAD FOR 0.20 MILE (0.32 KM) FOR
 AJ5443'THE ENTRANCE TO ANACOSTIA PARK TO A T JUNCTION, THENCE 0.55 MILE (0.89
 AJ5443'KM) EAST ALONG ANACOSTIA ROAD TO THE T JUNCTION FOR GOOD HOPE ROAD,
 AJ5443'THENCE 0.10 MI (0.16 KM) SOUTH ALONG GOOD HOPE ROAD TO MARK ON LEFT
 AJ5443'UNDERNEATH THE SOUTHEAST SIDE OF I-295 NORTHBOUND LANES, 17.0 FT (5.2
 AJ5443'M) EAST OF THE CENTERLINE OF GOOD HOPE RD, 4.5 FT (1.4 M) NORTHWEST OF
 AJ5443'A BLOCK RETAINING WALL SUPPORTING I-295, 41.0 FT (12.5 M)
 AJ5443'NORTH-NORTHWEST OF OFF RAMP, AND 7.0 FT (2.1 M) EAST OF A CURB FOR
 AJ5443'GOOD HOPE ROAD.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4279 ***********************************************************************
 HV4279  DESIGNATION -  F B 1913
 HV4279  PID         -  HV4279
 HV4279  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4279  COUNTRY     -  US
 HV4279  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4279
 HV4279                         *CURRENT SURVEY CONTROL
 HV4279  ______________________________________________________________________
 HV4279* NAD 83(1993) POSITION- 38 53 01.81568(N) 077 02 49.41531(W)   ADJUSTED
 HV4279* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV4279  ______________________________________________________________________
 HV4279  GEOID HEIGHT    -        -32.084 (meters)                     GEOID18
 HV4279  LAPLACE CORR    -         -2.61  (seconds)                    DEFLEC18
 HV4279  HORZ ORDER      -  THIRD
 HV4279
 HV4279.The horizontal coordinates were established by classical geodetic methods
 HV4279.and adjusted by the National Geodetic Survey in November 1994.
 HV4279
 HV4279.The orthometric height was scaled from a topographic map.
 HV4279
 HV4279.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4279.GEOID18 height accuracy estimate available here.
 HV4279
 HV4279.Click photographs - Photos may exist for this station.
 HV4279
 HV4279.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4279
 HV4279. The following values were computed from the NAD 83(1993) position.
 HV4279
 HV4279;                    North         East     Units Scale Factor Converg.
 HV4279;SPC MD       -   135,112.210   395,916.926   MT  0.99994986   -0 01 46.3
 HV4279;SPC MD       -   443,280.64  1,298,937.45   sFT  0.99994986   -0 01 46.3
 HV4279;SPC VA N     - 2,136,103.561 3,626,058.113   MT  0.99995916   +0 54 24.5
 HV4279;SPC VA N     - 7,008,199.77 11,896,492.33   sFT  0.99995916   +0 54 24.5
 HV4279;UTM  18      - 4,305,877.639   322,443.939   MT  0.99998822   -1 17 07.3
 HV4279
 HV4279!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4279!SPC MD       -   1.00000491  x   0.99994986  =   0.99995477
 HV4279!SPC VA N     -   1.00000491  x   0.99995916  =   0.99996407
 HV4279!UTM  18      -   1.00000491  x   0.99998822  =   0.99999313
 HV4279
 HV4279:                Primary Azimuth Mark                     Grid Az
 HV4279:SPC MD       -  HEURICHS BREWERY FINIAL                  334 08 53.4
 HV4279:SPC VA N     -  HEURICHS BREWERY FINIAL                  333 12 42.6
 HV4279:UTM  18      -  HEURICHS BREWERY FINIAL                  335 24 14.4
 HV4279
 HV4279_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2244305877(NAD 83)
 HV4279
 HV4279|---------------------------------------------------------------------|
 HV4279| PID    Reference Object                     Distance      Geod. Az  |
 HV4279|                                                           dddmmss.s |
 HV4279| HV4435 W P P 4 PB AND PP                   119.942 METERS 04410     |
 HV4279| HV4251 MOTOR                               486.032 METERS 1313158.1 |
 HV4279| HV4436 TIDAL USE                           APPROX. 0.5 KM 1313200.7 |
 HV4279| HV2005 BOAT                                278.970 METERS 13132     |
 HV4279| HV4301 HEURICHS BREWERY FINIAL             APPROX. 1.3 KM 3340707.1 |
 HV4279|---------------------------------------------------------------------|
 HV4279
 HV4279                          SUPERSEDED SURVEY CONTROL
 HV4279
 HV4279  NAD 83(1991)-  38 53 01.81439(N)    077 02 49.41681(W) AD(       ) 3
 HV4279  NAD 83(1986)-  38 53 01.81415(N)    077 02 49.42744(W) AD(       ) 3
 HV4279  NAD 27      -  38 53 01.41400(N)    077 02 50.50400(W) AD(       ) 3
 HV4279  USSD        -  38 53 01.75300(N)    077 02 50.33600(W) AD(       ) 3
 HV4279
 HV4279.Superseded values are not recommended for survey control.
 HV4279
 HV4279.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4279.See file dsdata.pdf to determine how the superseded data were derived.
 HV4279
 HV4279_MARKER: I = METAL ROD
 HV4279_SETTING: 0 = UNSPECIFIED SETTING
 HV4279_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4279
 HV4279  HISTORY     - Date     Condition        Report By
 HV4279  HISTORY     - 1913     MONUMENTED       USACE
 HV4279  HISTORY     - 1948     MARK NOT FOUND   CGS
 HV4279
 HV4279                          STATION DESCRIPTION
 HV4279
 HV4279'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1913 (OBF)
 HV4279'STATION IS IN CONCRETE MONUMENT, 8-INCH CAST-IRON PIPE,
 HV4279'CENTERED WITH 1/4-INCH BRASS ROD, 0.1 FOOT ABOVE GROUND, ABOUT
 HV4279'6 FEET ABOVE MEAN LOW WATER, 5.6 FEET NE OF EDGE OF WALL, 16.7
 HV4279'FEET SW OF 31-INCH WILLOW, AND 27 FEET NW OF 30-INCH WILLOW.
 HV4279
 HV4279                          STATION RECOVERY (1948)
 HV4279
 HV4279'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1948 (RJS)
 HV4279'STATION NOT RECOVERED AFTER SEARCH WITH PLANE TABLE.  WILLOW
 HV4279'TREES MENTIONED IN DESCRIPTION HAVE BEEN DESTROYED AND THIS AREA
 HV4279'IS BELIEVED TO HAVE UNDERGONE EXTENSIVE GRADING CHANGES SINCE
 HV4279'1935.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4676 ***********************************************************************
 HV4676  DESIGNATION -  F USE 1913
 HV4676  PID         -  HV4676
 HV4676  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4676  COUNTRY     -  US
 HV4676  USGS QUAD   -  ALEXANDRIA (2019)
 HV4676
 HV4676                         *CURRENT SURVEY CONTROL
 HV4676  ______________________________________________________________________
 HV4676* NAD 83(1993) POSITION- 38 52 14.17053(N) 077 01 06.95502(W)   ADJUSTED
 HV4676* NAVD 88 ORTHO HEIGHT -     4.    (meters)       13.    (feet) SCALED
 HV4676  ______________________________________________________________________
 HV4676  GEOID HEIGHT    -        -32.150 (meters)                     GEOID18
 HV4676  LAPLACE CORR    -         -3.08  (seconds)                    DEFLEC18
 HV4676  HORZ ORDER      -  THIRD
 HV4676
 HV4676.The horizontal coordinates were established by classical geodetic methods
 HV4676.and adjusted by the National Geodetic Survey in November 1994.
 HV4676
 HV4676.The orthometric height was scaled from a topographic map.
 HV4676
 HV4676.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4676.GEOID18 height accuracy estimate available here.
 HV4676
 HV4676.Click photographs - Photos may exist for this station.
 HV4676
 HV4676.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4676
 HV4676. The following values were computed from the NAD 83(1993) position.
 HV4676
 HV4676;                    North         East     Units Scale Factor Converg.
 HV4676;SPC MD       -   133,642.163   398,386.019   MT  0.99994985   -0 00 42.0
 HV4676;SPC MD       -   438,457.66  1,307,038.13   sFT  0.99994985   -0 00 42.0
 HV4676;SPC VA N     - 2,134,674.044 3,628,550.920   MT  0.99995812   +0 55 28.4
 HV4676;SPC VA N     - 7,003,509.76 11,904,670.81   sFT  0.99995812   +0 55 28.4
 HV4676;UTM  18      - 4,304,353.789   324,880.307   MT  0.99997764   -1 16 01.6
 HV4676
 HV4676!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4676!SPC MD       -   1.00000446  x   0.99994985  =   0.99995431
 HV4676!SPC VA N     -   1.00000446  x   0.99995812  =   0.99996258
 HV4676!UTM  18      -   1.00000446  x   0.99997764  =   0.99998210
 HV4676
 HV4676:                Primary Azimuth Mark                     Grid Az
 HV4676:SPC MD       -  INSANE                                   137 24 29.3
 HV4676:SPC VA N     -  INSANE                                   136 28 18.9
 HV4676:UTM  18      -  INSANE                                   138 39 48.9
 HV4676
 HV4676_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2488004353(NAD 83)
 HV4676
 HV4676|---------------------------------------------------------------------|
 HV4676| PID    Reference Object                     Distance      Geod. Az  |
 HV4676|                                                           dddmmss.s |
 HV4676| HV4675 INSANE                              APPROX. 2.4 KM 1372347.3 |
 HV4676|---------------------------------------------------------------------|
 HV4676
 HV4676                          SUPERSEDED SURVEY CONTROL
 HV4676
 HV4676  NAD 83(1991)-  38 52 14.16919(N)    077 01 06.95631(W) AD(       ) 3
 HV4676  NAD 83(1986)-  38 52 14.16880(N)    077 01 06.96725(W) AD(       ) 3
 HV4676  NAD 27      -  38 52 13.76900(N)    077 01 08.04900(W) AD(       ) 3
 HV4676  USSD        -  38 52 14.10600(N)    077 01 07.87900(W) AD(       ) 3
 HV4676
 HV4676.Superseded values are not recommended for survey control.
 HV4676
 HV4676.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4676.See file dsdata.pdf to determine how the superseded data were derived.
 HV4676
 HV4676_MARKER: B = BOLT
 HV4676_SETTING: 0 = UNSPECIFIED SETTING
 HV4676_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4676
 HV4676  HISTORY     - Date     Condition        Report By
 HV4676  HISTORY     - 1913     MONUMENTED       USACE
 HV4676  HISTORY     - 1940     GOOD             CGS
 HV4676
 HV4676                          STATION DESCRIPTION
 HV4676
 HV4676'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1913 (OBF)
 HV4676'STATION IS LOCATED SOME 100 FEET N OF THE ROAD ONTO THE WHARF
 HV4676'AT THE ARSENAL AT FOOT OF 4-1/2 STREET, AND ABOUT 30 OR 40 FEET
 HV4676'FROM SEA WALL.  H IS VISIBLE JUST ALONG THE W SIDE OF THE ROAD
 HV4676'EXTRUDING SOUTHERLY FROM THE WHARF ROAD.
 HV4676'
 HV4676'FOUND A CONCRETE BLOCK WITH A COPPER BOLT IN IT AND CROSS ON
 HV4676'THE TOP OF THE BOLT.
 HV4676
 HV4676                          STATION RECOVERY (1940)
 HV4676
 HV4676'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV4676'STATION IS LOST.  THIS STATION WAS REPLACED BY BARRACKS U.S.E.
 HV4676'IN 1931 AND THIS LATER STATION HAS NOW BEEN LOST BY CONSTRUCTION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ5416 ***********************************************************************
 AJ5416  DESIGNATION -  F04MEZNJ
 AJ5416  PID         -  AJ5416
 AJ5416  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ5416  COUNTRY     -  US
 AJ5416  USGS QUAD   -  WASHINGTON WEST (2016)
 AJ5416
 AJ5416                         *CURRENT SURVEY CONTROL
 AJ5416  ______________________________________________________________________
 AJ5416* NAD 83(1986) POSITION- 38 52 34.     (N) 077 00 17.     (W)   SCALED
 AJ5416* NAVD 88 ORTHO HEIGHT -    -5.720 (meters)      -18.77  (feet) ADJUSTED
 AJ5416  ______________________________________________________________________
 AJ5416  GEOID HEIGHT    -        -32.162 (meters)                     GEOID18
 AJ5416  DYNAMIC HEIGHT  -         -5.717 (meters)      -18.76  (feet) COMP
 AJ5416  MODELED GRAVITY -    980,097.3   (mgal)                       NAVD 88
 AJ5416
 AJ5416  VERT ORDER      -  SECOND    CLASS I
 AJ5416
 AJ5416.The horizontal coordinates were scaled from a map and have
 AJ5416.an estimated accuracy of +/- 6 seconds.
 AJ5416
 AJ5416.The orthometric height was determined by differential leveling and
 AJ5416.adjusted by the NATIONAL GEODETIC SURVEY
 AJ5416.in October 2001.
 AJ5416
 AJ5416.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ5416.GEOID18 height accuracy estimate available here.
 AJ5416
 AJ5416.Click photographs - Photos may exist for this station.
 AJ5416
 AJ5416.The dynamic height is computed by dividing the NAVD 88
 AJ5416.geopotential number by the normal gravity value computed on the
 AJ5416.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ5416.degrees latitude (g = 980.6199 gals.).
 AJ5416
 AJ5416.The modeled gravity was interpolated from observed gravity values.
 AJ5416
 AJ5416
 AJ5416_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ260049(NAD 83)
 AJ5416
 AJ5416                          SUPERSEDED SURVEY CONTROL
 AJ5416
 AJ5416.No superseded survey control is available for this station.
 AJ5416
 AJ5416_MARKER: DD = SURVEY DISK
 AJ5416_SETTING: 35 = SET IN A MAT FOUNDATION OR CONCRETE SLAB OTHER THAN
 AJ5416+WITH SETTING: PAVEMENT
 AJ5416_SP_SET: FLOOR
 AJ5416_STAMPING: F04MEZNJ
 AJ5416_MARK LOGO: WMATA
 AJ5416_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ5416_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AJ5416+STABILITY: SURFACE MOTION
 AJ5416
 AJ5416  HISTORY     - Date     Condition        Report By
 AJ5416  HISTORY     - 2001     MONUMENTED       WMATA
 AJ5416
 AJ5416                          STATION DESCRIPTION
 AJ5416
 AJ5416'DESCRIBED BY WASH METRO TRANSIT 2001 (CAR)
 AJ5416'0.2 MILE (0.3 KM) EAST ALONG M STREET FROM THE NORTHBOUND LANES OF
 AJ5416'SOUTH CAPITOL BLVD, TO THE NAVY YARD METRO STATION ON LEFT, THENCE
 AJ5416'DOWN ESCALATORS AND MARK ON RIGHT AT BOTTOM OF ESCALATORS.  1.5 FEET
 AJ5416'(0.5 M) SOUTH OF NORTH FACE OF WALL, AND 5.8 FEET (1.8 M) EAST OF THE
 AJ5416'EDGE WHERE THE ESCALATORS GO UNDER FLOOR.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ5417 ***********************************************************************
 AJ5417  DESIGNATION -  F04OB 12666
 AJ5417  PID         -  AJ5417
 AJ5417  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ5417  COUNTRY     -  US
 AJ5417  USGS QUAD   -  WASHINGTON WEST (2016)
 AJ5417
 AJ5417                         *CURRENT SURVEY CONTROL
 AJ5417  ______________________________________________________________________
 AJ5417* NAD 83(1986) POSITION- 38 52 33.     (N) 077 00 17.     (W)   SCALED
 AJ5417* NAVD 88 ORTHO HEIGHT -    -9.902 (meters)      -32.49  (feet) ADJUSTED
 AJ5417  ______________________________________________________________________
 AJ5417  GEOID HEIGHT    -        -32.163 (meters)                     GEOID18
 AJ5417  DYNAMIC HEIGHT  -         -9.897 (meters)      -32.47  (feet) COMP
 AJ5417  MODELED GRAVITY -    980,097.2   (mgal)                       NAVD 88
 AJ5417
 AJ5417  VERT ORDER      -  SECOND    CLASS I
 AJ5417
 AJ5417.The horizontal coordinates were scaled from a map and have
 AJ5417.an estimated accuracy of +/- 6 seconds.
 AJ5417
 AJ5417.The orthometric height was determined by differential leveling and
 AJ5417.adjusted by the NATIONAL GEODETIC SURVEY
 AJ5417.in October 2001.
 AJ5417
 AJ5417.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ5417.GEOID18 height accuracy estimate available here.
 AJ5417
 AJ5417.Click photographs - Photos may exist for this station.
 AJ5417
 AJ5417.The dynamic height is computed by dividing the NAVD 88
 AJ5417.geopotential number by the normal gravity value computed on the
 AJ5417.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ5417.degrees latitude (g = 980.6199 gals.).
 AJ5417
 AJ5417.The modeled gravity was interpolated from observed gravity values.
 AJ5417
 AJ5417
 AJ5417_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ260049(NAD 83)
 AJ5417
 AJ5417                          SUPERSEDED SURVEY CONTROL
 AJ5417
 AJ5417.No superseded survey control is available for this station.
 AJ5417
 AJ5417_MARKER: DD = SURVEY DISK
 AJ5417_SETTING: 35 = SET IN A MAT FOUNDATION OR CONCRETE SLAB OTHER THAN
 AJ5417+WITH SETTING: PAVEMENT
 AJ5417_SP_SET: WALKWAY
 AJ5417_STAMPING: F040B 12666
 AJ5417_MARK LOGO: WMATA
 AJ5417_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ5417_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AJ5417+STABILITY: SURFACE MOTION
 AJ5417
 AJ5417  HISTORY     - Date     Condition        Report By
 AJ5417  HISTORY     - 2001     MONUMENTED       WMATA
 AJ5417
 AJ5417                          STATION DESCRIPTION
 AJ5417
 AJ5417'DESCRIBED BY WASH METRO TRANSIT 2001 (CAR)
 AJ5417'0.2 MILE (0.3 KM) EAST ALONG M STREET FROM THE NORTHBOUND LANES OF
 AJ5417'SOUTH CAPITOL BLVD, TO THE NAVY YARD METRO STATION, THENCE DOWN
 AJ5417'ESCALATORS AND CONCRETE STEPS, THENCE TURN LEFT AND FOLLOW OUTBOUND
 AJ5417'TRACKS TO A GATE AND MARK PAST GATE IN A WALKWAY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ5415 ***********************************************************************
 AJ5415  DESIGNATION -  F04VF9
 AJ5415  PID         -  AJ5415
 AJ5415  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ5415  COUNTRY     -  US
 AJ5415  USGS QUAD   -  WASHINGTON WEST (2016)
 AJ5415
 AJ5415                         *CURRENT SURVEY CONTROL
 AJ5415  ______________________________________________________________________
 AJ5415* NAD 83(1986) POSITION- 38 52 34.     (N) 077 00 17.     (W)   SCALED
 AJ5415* NAVD 88 ORTHO HEIGHT -     4.958 (meters)       16.27  (feet) ADJUSTED
 AJ5415  ______________________________________________________________________
 AJ5415  GEOID HEIGHT    -        -32.162 (meters)                     GEOID18
 AJ5415  DYNAMIC HEIGHT  -          4.955 (meters)       16.26  (feet) COMP
 AJ5415  MODELED GRAVITY -    980,097.3   (mgal)                       NAVD 88
 AJ5415
 AJ5415  VERT ORDER      -  SECOND    CLASS I
 AJ5415
 AJ5415.The horizontal coordinates were scaled from a map and have
 AJ5415.an estimated accuracy of +/- 6 seconds.
 AJ5415
 AJ5415.The orthometric height was determined by differential leveling and
 AJ5415.adjusted by the NATIONAL GEODETIC SURVEY
 AJ5415.in October 2001.
 AJ5415
 AJ5415.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ5415.GEOID18 height accuracy estimate available here.
 AJ5415
 AJ5415.Click photographs - Photos may exist for this station.
 AJ5415
 AJ5415.The dynamic height is computed by dividing the NAVD 88
 AJ5415.geopotential number by the normal gravity value computed on the
 AJ5415.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ5415.degrees latitude (g = 980.6199 gals.).
 AJ5415
 AJ5415.The modeled gravity was interpolated from observed gravity values.
 AJ5415
 AJ5415
 AJ5415_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ260049(NAD 83)
 AJ5415
 AJ5415                          SUPERSEDED SURVEY CONTROL
 AJ5415
 AJ5415.No superseded survey control is available for this station.
 AJ5415
 AJ5415_MARKER: DD = SURVEY DISK
 AJ5415_SETTING: 41 = SET IN A LARGE STRUCTURE WITH FOUNDATIONS ON BEDROCK
 AJ5415_SP_SET: AIR SHAFT FOUNDATION
 AJ5415_STAMPING: F04VF9
 AJ5415_MARK LOGO: WMATA
 AJ5415_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ5415_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 AJ5415+STABILITY: POSITION/ELEVATION WELL
 AJ5415_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AJ5415+SATELLITE: SATELLITE OBSERVATIONS - 2001
 AJ5415
 AJ5415  HISTORY     - Date     Condition        Report By
 AJ5415  HISTORY     - 2001     MONUMENTED       WMATA
 AJ5415
 AJ5415                          STATION DESCRIPTION
 AJ5415
 AJ5415'DESCRIBED BY WASH METRO TRANSIT 2001 (CAR)
 AJ5415'0.2 MILE (0.3 KM) EAST ALONG M STREET FROM THE NORTHBOUND LANES OF
 AJ5415'SOUTH CAPITOL BLVD, TO THE NAVY YARD METRO STATION ON LEFT, IN TOP OF
 AJ5415'THE AIR SHAFT FOR THE METRO TRAIN BELOW, 16.9 FEET (5.2 M) SOUTHWEST
 AJ5415'OF THE RETAINING WALL FOR ESCALATORS, 5.63 FEET (1.72 M) WEST OF A
 AJ5415'STANDPIPE, AND 3.63 FEET (1.11 M) NORTH OF CURB FOR M STREET.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ5412 ***********************************************************************
 AJ5412  DESIGNATION -  F05VF9
 AJ5412  PID         -  AJ5412
 AJ5412  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ5412  COUNTRY     -  US
 AJ5412  USGS QUAD   -  ANACOSTIA (2016)
 AJ5412
 AJ5412                         *CURRENT SURVEY CONTROL
 AJ5412  ______________________________________________________________________
 AJ5412* NAD 83(1986) POSITION- 38 52 26.     (N) 076 59 59.     (W)   SCALED
 AJ5412* NAVD 88 ORTHO HEIGHT -     5.067 (meters)       16.62  (feet) ADJUSTED
 AJ5412  ______________________________________________________________________
 AJ5412  GEOID HEIGHT    -        -32.174 (meters)                     GEOID18
 AJ5412  DYNAMIC HEIGHT  -          5.064 (meters)       16.61  (feet) COMP
 AJ5412  MODELED GRAVITY -    980,096.2   (mgal)                       NAVD 88
 AJ5412
 AJ5412  VERT ORDER      -  SECOND    CLASS I
 AJ5412
 AJ5412.The horizontal coordinates were scaled from a map and have
 AJ5412.an estimated accuracy of +/- 6 seconds.
 AJ5412
 AJ5412.The orthometric height was determined by differential leveling and
 AJ5412.adjusted by the NATIONAL GEODETIC SURVEY
 AJ5412.in October 2001.
 AJ5412
 AJ5412.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ5412.GEOID18 height accuracy estimate available here.
 AJ5412
 AJ5412.Click photographs - Photos may exist for this station.
 AJ5412
 AJ5412.The dynamic height is computed by dividing the NAVD 88
 AJ5412.geopotential number by the normal gravity value computed on the
 AJ5412.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ5412.degrees latitude (g = 980.6199 gals.).
 AJ5412
 AJ5412.The modeled gravity was interpolated from observed gravity values.
 AJ5412
 AJ5412
 AJ5412_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ265046(NAD 83)
 AJ5412
 AJ5412                          SUPERSEDED SURVEY CONTROL
 AJ5412
 AJ5412.No superseded survey control is available for this station.
 AJ5412
 AJ5412_MARKER: DD = SURVEY DISK
 AJ5412_SETTING: 41 = SET IN A LARGE STRUCTURE WITH FOUNDATIONS ON BEDROCK
 AJ5412_SP_SET: AIR VENT SHAFT
 AJ5412_STAMPING: F05VF9
 AJ5412_MARK LOGO: WMATA
 AJ5412_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ5412_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 AJ5412+STABILITY: POSITION/ELEVATION WELL
 AJ5412_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AJ5412+SATELLITE: SATELLITE OBSERVATIONS - August 06, 2001
 AJ5412
 AJ5412  HISTORY     - Date     Condition        Report By
 AJ5412  HISTORY     - 2001     MONUMENTED       WMATA
 AJ5412  HISTORY     - 20010806 GOOD             NGS
 AJ5412
 AJ5412                          STATION DESCRIPTION
 AJ5412
 AJ5412'DESCRIBED BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 AJ5412'TO REACH FROM THE JUNCTION OF SOUTH CAPITAL STREET AND M STREET (IN
 AJ5412'SOUTHEAST WASHINGTON DC) GO EAST ALONG M STREET FOR 0.35 MILE (0.56
 AJ5412'KM) TO ENTRANCE OF THE SOUTHEAST FEDERAL CENTER, TURN RIGHT AND GO
 AJ5412'SOUTH, PASS THRU SECURITY GATE AND CONTINUE 0.1 MILE (0.2 KM) TO THE
 AJ5412'T-ROAD JUNCTION OF TINGEY STREET, TURN LEFT AND GO EAST 0.05 MILE
 AJ5412'(0.08 KM) ALONG TINGEY STREET TO ENTRANCE OF A GRAVEL PARKING AREA,
 AJ5412'THENCE SOUTHEAST THRU PARKING AREA FOR 0.05 MILE (0.08 KM) TO A LARGE
 AJ5412'CONCRETE AIR VENT SHAFT AND MARK ON TOP OF EAST SIDE OF SHAFT.  19.1
 AJ5412'FEET (5.8 M) EAST OF WEST EDGE OF CONCRETE FOUNDATION, 6.3 FEET (1.9
 AJ5412'M) WEST OF EAST EDGE OF CONCRETE FOUNDATION, 1.5 FEET (0.5 M) NORTH OF
 AJ5412'SOUTH EDGE OF CONCRETE FOUNDATION, 0.5 FEET (15.2 CM) SOUTH FROM HAND
 AJ5412'RAIL.  NOTE--AIR SHAFT FOUNDATION IS 100 FEET (30.5 M) DEEP.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8285 ***********************************************************************
 HV8285  DESIGNATION -  FALKEN GPS E1
 HV8285  PID         -  HV8285
 HV8285  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8285  COUNTRY     -  US
 HV8285  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8285
 HV8285                         *CURRENT SURVEY CONTROL
 HV8285  ______________________________________________________________________
 HV8285* NAD 83(2011) POSITION- 38 57 07.62834(N) 077 00 08.37473(W)   ADJUSTED
 HV8285* NAD 83(2011) ELLIP HT-    33.222 (meters)        (06/27/12)   ADJUSTED
 HV8285* NAD 83(2011) EPOCH   -  2010.00
 HV8285* NAVD 88 ORTHO HEIGHT -    65.3   (meters)      214.    (feet) VERTCON3
 HV8285  ______________________________________________________________________
 HV8285  GEOID HEIGHT    -        -32.034 (meters)                     GEOID18
 HV8285  NAD 83(2011) X  -  1,117,067.149 (meters)                     COMP
 HV8285  NAD 83(2011) Y  - -4,839,445.855 (meters)                     COMP
 HV8285  NAD 83(2011) Z  -  3,988,205.582 (meters)                     COMP
 HV8285  LAPLACE CORR    -         -2.97  (seconds)                    DEFLEC18
 HV8285
 HV8285  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV8285  Standards:
 HV8285         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV8285            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV8285  -------------------------------------------------------------------
 HV8285  NETWORK    0.96   1.78           0.42   0.36   0.91      0.04409350
 HV8285  -------------------------------------------------------------------
 HV8285  Click here for local accuracies and other accuracy information.
 HV8285
 HV8285.The horizontal coordinates were established by GPS observations
 HV8285.and adjusted by the National Geodetic Survey in June 2012.
 HV8285
 HV8285.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV8285.been affixed to the stable North American tectonic plate. See 
 HV8285.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV8285
 HV8285.The horizontal coordinates are valid at the epoch date displayed above
 HV8285.which is a decimal equivalence of Year/Month/Day.
 HV8285
 HV8285.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV8285.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV8285
 HV8285.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8285.GEOID18 height accuracy estimate available here.
 HV8285
 HV8285.Click photographs - Photos may exist for this station.
 HV8285
 HV8285.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV8285
 HV8285.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV8285
 HV8285.The ellipsoidal height was determined by GPS observations
 HV8285.and is referenced to NAD 83.
 HV8285
 HV8285. The following values were computed from the NAD 83(2011) position.
 HV8285
 HV8285;                    North         East     Units Scale Factor Converg.
 HV8285;SPC MD       -   142,690.957   399,798.354   MT  0.99995073   -0 00 05.3
 HV8285;SPC MD       -   468,145.25  1,311,671.77   sFT  0.99995073   -0 00 05.3
 HV8285;SPC VA N     - 2,143,744.810 3,629,815.230   MT  0.99996540   +0 56 05.0
 HV8285;SPC VA N     - 7,033,269.43 11,908,818.80   sFT  0.99996540   +0 56 05.0
 HV8285;UTM  18      - 4,313,369.652   326,490.774   MT  0.99997072   -1 15 32.8
 HV8285
 HV8285!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV8285!SPC MD       -   0.99999479  x   0.99995073  =   0.99994552
 HV8285!SPC VA N     -   0.99999479  x   0.99996540  =   0.99996019
 HV8285!UTM  18      -   0.99999479  x   0.99997072  =   0.99996551
 HV8285
 HV8285_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2649013369(NAD 83)
 HV8285
 HV8285                          SUPERSEDED SURVEY CONTROL
 HV8285
 HV8285  NAD 83(2007)-  38 57 07.62895(N)    077 00 08.37555(W) AD(2002.00) 0
 HV8285  ELLIP H (02/10/07)   33.234  (m)                       GP(2002.00)    
 HV8285  ELLIP H (08/30/02)   33.230  (m)                       GP(       ) 4 2
 HV8285  NAD 83(1993)-  38 57 07.62944(N)    077 00 08.37526(W) AD(       ) 1
 HV8285  ELLIP H (11/14/94)   33.221  (m)                       GP(       ) 4 2
 HV8285  NAD 83(1991)-  38 57 07.62885(N)    077 00 08.37517(W) AD(       ) 1
 HV8285  NAD 83(1986)-  38 57 07.62751(N)    077 00 08.38593(W) AD(       ) 1
 HV8285  NGVD 29 (05/23/89)   65.5    (m)  RAPSU86  model used  GPS OBS        
 HV8285
 HV8285.Superseded values are not recommended for survey control.
 HV8285
 HV8285.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8285.See file dsdata.pdf to determine how the superseded data were derived.
 HV8285
 HV8285_MARKER: DD = SURVEY DISK
 HV8285_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8285_SP_SET: CANOPY ROOF OF METRO STATION
 HV8285_STAMPING: GPS E1
 HV8285_MARK LOGO: DEWDAV
 HV8285_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV8285_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8285_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV8285+SATELLITE: SATELLITE OBSERVATIONS - September 20, 1992
 HV8285
 HV8285  HISTORY     - Date     Condition        Report By
 HV8285  HISTORY     - 1988     MONUMENTED       DEWDAV
 HV8285  HISTORY     - 19920920 GOOD             HOBBS
 HV8285  HISTORY     - 20090317 MARK NOT FOUND   GEOCAC
 HV8285
 HV8285                          STATION DESCRIPTION
 HV8285
 HV8285'DESCRIBED BY DEWBERRY DAVIS 1988
 HV8285'THE STATION IN NEAR THE NORTHEAST BOUNDARY BETWEEN THE DISTRICT OF
 HV8285'COLUMBIA AND MARYLAND.
 HV8285'TO REACH THE STATION FROM THE INTERSECTION OF NORTH CAPITOL STREET AND
 HV8285'MISSOURI AVENUE, GO EAST ON MISSOURI AVENUE 0.4 MILE PASSING UNDER
 HV8285'RAIL ROAD BRIDGE, BEAR RIGHT UNDER TRACKS AND TURN ON TO SOUTH DAKOTA
 HV8285'AVENUE, CONTINUE SE ON SOUTH DAKOTA AVENUE FOR 0.4 MILE TO GALLOWAY
 HV8285'STREET ON THE RIGHT, TURN RIGHT ON TO GALLOWAY STREET AND GO WEST FOR
 HV8285'0.2 MILE TO FORT TOTTEN METRO STATION, AND STATION.
 HV8285'THE STATION MARK IS A 3.5 INCH BRASS METRO CONTROL SURVEY DISK STAMPED
 HV8285'---GPS E1--- SET IN THE CANOPY ROOF OF THE METRO STATION.  THE MARK IS
 HV8285'ON THE WEST CANOPY JUST NORTH OF THE LATERAL ROOF SUPPORT.
 HV8285
 HV8285                          STATION RECOVERY (1992)
 HV8285
 HV8285'RECOVERY NOTE BY HOBBS AND ASSOCIATES 1992
 HV8285'RECOVERED IN GOOD CONDITION.
 HV8285
 HV8285                          STATION RECOVERY (2009)
 HV8285
 HV8285'RECOVERY NOTE BY GEOCACHING 2009 (LPC)
 HV8285'WE SEARCHED CAREFULLY BUT WERE UNABLE TO FIND THIS MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9831 ***********************************************************************
 HV9831  DESIGNATION -  FALKEN III GPS E 14
 HV9831  PID         -  HV9831
 HV9831  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9831  COUNTRY     -  US
 HV9831  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9831
 HV9831                         *CURRENT SURVEY CONTROL
 HV9831  ______________________________________________________________________
 HV9831* NAD 83(2011) POSITION- 38 55 49.41946(N) 077 01 57.79120(W)   ADJUSTED
 HV9831* NAD 83(2011) ELLIP HT-    26.717 (meters)        (06/27/12)   ADJUSTED
 HV9831* NAD 83(2011) EPOCH   -  2010.00
 HV9831* NAVD 88 ORTHO HEIGHT -    58.8   (meters)      193.    (feet) VERTCON3
 HV9831  ______________________________________________________________________
 HV9831  GEOID HEIGHT    -        -32.018 (meters)                     GEOID18
 HV9831  NAD 83(2011) X  -  1,114,838.844 (meters)                     COMP
 HV9831  NAD 83(2011) Y  - -4,841,510.003 (meters)                     COMP
 HV9831  NAD 83(2011) Z  -  3,986,325.646 (meters)                     COMP
 HV9831  LAPLACE CORR    -         -1.81  (seconds)                    DEFLEC18
 HV9831
 HV9831  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV9831  Standards:
 HV9831         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV9831            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV9831  -------------------------------------------------------------------
 HV9831  NETWORK    1.03   1.84           0.45   0.39   0.94      0.09921118
 HV9831  -------------------------------------------------------------------
 HV9831  Click here for local accuracies and other accuracy information.
 HV9831
 HV9831.The horizontal coordinates were established by GPS observations
 HV9831.and adjusted by the National Geodetic Survey in June 2012.
 HV9831
 HV9831.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV9831.been affixed to the stable North American tectonic plate. See 
 HV9831.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV9831
 HV9831.The horizontal coordinates are valid at the epoch date displayed above
 HV9831.which is a decimal equivalence of Year/Month/Day.
 HV9831
 HV9831.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV9831.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV9831
 HV9831.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9831.GEOID18 height accuracy estimate available here.
 HV9831
 HV9831.Click photographs - Photos may exist for this station.
 HV9831
 HV9831.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV9831
 HV9831.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9831
 HV9831.The ellipsoidal height was determined by GPS observations
 HV9831.and is referenced to NAD 83.
 HV9831
 HV9831. The following values were computed from the NAD 83(2011) position.
 HV9831
 HV9831;                    North         East     Units Scale Factor Converg.
 HV9831;SPC MD       -   140,279.829   397,162.969   MT  0.99995030   -0 01 13.9
 HV9831;SPC MD       -   460,234.74  1,303,025.51   sFT  0.99995030   -0 01 13.9
 HV9831;SPC VA N     - 2,141,290.910 3,627,219.559   MT  0.99996326   +0 54 56.7
 HV9831;SPC VA N     - 7,025,218.59 11,900,302.84   sFT  0.99996326   +0 54 56.7
 HV9831;UTM  18      - 4,311,016.874   323,803.046   MT  0.99998229   -1 16 39.5
 HV9831
 HV9831!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9831!SPC MD       -   0.99999581  x   0.99995030  =   0.99994611
 HV9831!SPC VA N     -   0.99999581  x   0.99996326  =   0.99995907
 HV9831!UTM  18      -   0.99999581  x   0.99998229  =   0.99997810
 HV9831
 HV9831_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2380311016(NAD 83)
 HV9831
 HV9831|---------------------------------------------------------------------|
 HV9831| PID    Reference Object                     Distance      Geod. Az  |
 HV9831|                                                           dddmmss.s |
 HV9831| HV9835 UNGER GPS COL 5R E 14A              255.569 METERS 07013     |
 HV9831|---------------------------------------------------------------------|
 HV9831
 HV9831                          SUPERSEDED SURVEY CONTROL
 HV9831
 HV9831  NAD 83(2007)-  38 55 49.42009(N)    077 01 57.79201(W) AD(2002.00) 0
 HV9831  ELLIP H (02/10/07)   26.729  (m)                       GP(2002.00)    
 HV9831  ELLIP H (08/30/02)   26.725  (m)                       GP(       ) 4 2
 HV9831  NAD 83(1993)-  38 55 49.42054(N)    077 01 57.79179(W) AD(       ) 1
 HV9831  ELLIP H (11/14/94)   26.719  (m)                       GP(       ) 4 2
 HV9831  NAD 83(1991)-  38 55 49.41996(N)    077 01 57.79183(W) AD(       ) 1
 HV9831  NGVD 29 (11/30/93)   59.0    (m)  GEOID93  model used  GPS OBS        
 HV9831
 HV9831.Superseded values are not recommended for survey control.
 HV9831
 HV9831.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9831.See file dsdata.pdf to determine how the superseded data were derived.
 HV9831
 HV9831_MARKER: DD = SURVEY DISK
 HV9831_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV9831_SP_SET: FLUSH IN TRAFFIC ISLAND
 HV9831_STAMPING: FALKEN III GPS 9-92
 HV9831_MARK LOGO: DEWDAV
 HV9831_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9831_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9831_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV9831+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9831
 HV9831  HISTORY     - Date     Condition        Report By
 HV9831  HISTORY     - 1992     MONUMENTED       DEWDAV
 HV9831  HISTORY     - 20200813 MARK NOT FOUND   NGS
 HV9831
 HV9831                          STATION DESCRIPTION
 HV9831
 HV9831'DESCRIBED BY DEWBERRY DAVIS 1992
 HV9831'STATION IS LOCATED IN DOWNTOWN WASHINGTON, DISTRICT OF COLUMBIA.
 HV9831'TO REACH STATION PROCEED TO INTERSECTION OF 14TH STREET NORTHWEST AND
 HV9831'PARK ROAD NORTHWEST TO STATION IN TRAFFIC ISLAND NORTHWEST OF
 HV9831'CENTERLINE INTERSECTION. STATION IS STANDARD 2.5 INCH DIAMETER BRASS
 HV9831'METRO DISK SET FLUSH IN TRAFFIC ISLAND.
 HV9831'STATION IS 10.35 FT (3.15 M) SOUTHEAST OF LIGHT POLE BASE, 12.48 FT
 HV9831'(3.80 M) SOUTHWEST OF BELL SYSTEM MANHOLE, 18.00 FT (5.49 M)
 HV9831'SOUTHWEST OF PEPCO MANHOLE, SOUTH 05-18-16 EAST 1069.938 FT
 HV9831'(326.118 M) FROM METRO CONTROL POINT E12XR, SOUTH 70-14-15 WEST
 HV9831'838.486 FT (255.571 M) FROM METRO CONTROL STATION UNGER GPS COL5R AND
 HV9831'NORTH 06-54-31 WEST OF METRO CONTROL POINT E-13.
 HV9831
 HV9831                          STATION RECOVERY (2020)
 HV9831
 HV9831'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JKH)
 HV9831'THERE IS NO LONGER AN ELEVATED TRAFFIC ISLAND AT THIS LOCATION.  IT
 HV9831'HAS RECENTLY BEEN DEMOLISHED AND HAS BEEN REPLACED WITH ASPHALT FLUSH
 HV9831'WITH THE REST OF THE ROAD.  MARK IS MOST LIKELY DESTROYED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4337 ***********************************************************************
 HV4337  DESIGNATION -  FARM
 HV4337  PID         -  HV4337
 HV4337  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4337  COUNTRY     -  US
 HV4337  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4337
 HV4337                         *CURRENT SURVEY CONTROL
 HV4337  ______________________________________________________________________
 HV4337* NAD 83(1993) POSITION- 38 52 51.05809(N) 077 03 18.31438(W)   ADJUSTED
 HV4337* NAVD 88 ORTHO HEIGHT -     2.    (meters)        7.    (feet) SCALED
 HV4337  ______________________________________________________________________
 HV4337  GEOID HEIGHT    -        -32.078 (meters)                     GEOID18
 HV4337  LAPLACE CORR    -         -2.87  (seconds)                    DEFLEC18
 HV4337  HORZ ORDER      -  SECOND
 HV4337
 HV4337.The horizontal coordinates were established by classical geodetic methods
 HV4337.and adjusted by the National Geodetic Survey in November 1994.
 HV4337
 HV4337.The orthometric height was scaled from a topographic map.
 HV4337
 HV4337.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4337.GEOID18 height accuracy estimate available here.
 HV4337
 HV4337.Click photographs - Photos may exist for this station.
 HV4337
 HV4337.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4337
 HV4337. The following values were computed from the NAD 83(1993) position.
 HV4337
 HV4337;                    North         East     Units Scale Factor Converg.
 HV4337;SPC MD       -   134,780.885   395,220.230   MT  0.99994985   -0 02 04.5
 HV4337;SPC MD       -   442,193.62  1,296,651.70   sFT  0.99994985   -0 02 04.5
 HV4337;SPC VA N     - 2,135,760.891 3,625,366.918   MT  0.99995892   +0 54 06.5
 HV4337;SPC VA N     - 7,007,075.52 11,894,224.63   sFT  0.99995892   +0 54 06.5
 HV4337;UTM  18      - 4,305,561.649   321,740.121   MT  0.99999130   -1 17 25.2
 HV4337
 HV4337!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4337!SPC MD       -   1.00000476  x   0.99994985  =   0.99995461
 HV4337!SPC VA N     -   1.00000476  x   0.99995892  =   0.99996368
 HV4337!UTM  18      -   1.00000476  x   0.99999130  =   0.99999606
 HV4337
 HV4337:                Primary Azimuth Mark                     Grid Az
 HV4337:SPC MD       -  KNOLL                                    189 32 34.7
 HV4337:SPC VA N     -  KNOLL                                    188 36 23.7
 HV4337:UTM  18      -  KNOLL                                    190 47 55.4
 HV4337
 HV4337_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2174005561(NAD 83)
 HV4337
 HV4337|---------------------------------------------------------------------|
 HV4337| PID    Reference Object                     Distance      Geod. Az  |
 HV4337|                                                           dddmmss.s |
 HV4337| DC6266 FARM RM                              12.063 METERS 13946     |
 HV4337| HV4592 KNOLL                               APPROX. 0.8 KM 1893030.2 |
 HV4337| HV3406 T O                                  89.512 METERS 20716     |
 HV4337|---------------------------------------------------------------------|
 HV4337
 HV4337                          SUPERSEDED SURVEY CONTROL
 HV4337
 HV4337  NAD 83(1991)-  38 52 51.05679(N)    077 03 18.31591(W) AD(       ) 2
 HV4337  NAD 83(1986)-  38 52 51.05662(N)    077 03 18.32649(W) AD(       ) 2
 HV4337  NAD 27      -  38 52 50.65500(N)    077 03 19.40200(W) AD(       ) 2
 HV4337
 HV4337.Superseded values are not recommended for survey control.
 HV4337
 HV4337.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4337.See file dsdata.pdf to determine how the superseded data were derived.
 HV4337
 HV4337_MARKER: DD = SURVEY DISK
 HV4337_SETTING: 4 = OBJECT SURROUNDED BY MASS OF CONCRETE
 HV4337_MARK LOGO: USACE
 HV4337_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4337
 HV4337  HISTORY     - Date     Condition        Report By
 HV4337  HISTORY     - 1924     MONUMENTED       USACE
 HV4337  HISTORY     - 1940     MARK NOT FOUND   CGS
 HV4337
 HV4337                          STATION DESCRIPTION
 HV4337
 HV4337'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1924 (EWE)
 HV4337'STATION IS ON COLUMBIA ISLAND IN THE POTOMAC RIVER A FEW METERS N
 HV4337'OF THE AGRICULTURAL FARM FERRY LANDING AND AT THE W SIDE OF THE
 HV4337'TOOL HOUSE AND SHELTER, JUST INSIDE THE DIKE WHICH WAS BUILT
 HV4337'TO RETAIN THE PUMPED IN MATERIAL.  STATION IS MARKED BY A STANDARD
 HV4337'U.S.E. DISK SET IN A MASS OF CONCRETE FLUSH WITH THE SURFACE.
 HV4337'
 HV4337'A REFERENCE MARK CONSISTING OF A DRILL HOLE IN A HEAVY ROCK WAS SET
 HV4337'ON THE DIKE JUST S OF THE FERRY LANDING.
 HV4337
 HV4337                          STATION RECOVERY (1940)
 HV4337
 HV4337'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV4337'NEITHER THE STATION OR THE REFERENCE MARK COULD BE FOUND AFTER 1/2
 HV4337'HOUR SEARCH.  CHANGES MAKE THE ORIGINAL DESCRIPTION OF LITTLE VALUE.
 HV4337'IT SEEMS AS THOUGH THE AREA HAS BEEN FILLED IN SINCE THE
 HV4337'ESTABLISHMENT OF THE STATION AND THE MARKS COVERED OVER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2037 ***********************************************************************
 HV2037  DESIGNATION -  FIELD
 HV2037  PID         -  HV2037
 HV2037  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2037  COUNTRY     -  US
 HV2037  USGS QUAD   -  ALEXANDRIA (2019)
 HV2037
 HV2037                         *CURRENT SURVEY CONTROL
 HV2037  ______________________________________________________________________
 HV2037* NAD 83(1986) POSITION- 38 50 53.     (N) 077 01 12.     (W)   SCALED
 HV2037* NAVD 88 ORTHO HEIGHT -     2.949 (meters)        9.68  (feet) ADJUSTED
 HV2037  ______________________________________________________________________
 HV2037  GEOID HEIGHT    -        -32.184 (meters)                     GEOID18
 HV2037  DYNAMIC HEIGHT  -          2.947 (meters)        9.67  (feet) COMP
 HV2037  MODELED GRAVITY -    980,093.2   (mgal)                       NAVD 88
 HV2037
 HV2037  VERT ORDER      -  FIRST     CLASS II
 HV2037
 HV2037.The horizontal coordinates were scaled from a map and have
 HV2037.an estimated accuracy of +/- 6 seconds.
 HV2037
 HV2037.The orthometric height was determined by differential leveling and
 HV2037.adjusted by the NATIONAL GEODETIC SURVEY
 HV2037.in June 1991.
 HV2037
 HV2037.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2037.GEOID18 height accuracy estimate available here.
 HV2037
 HV2037.Click photographs - Photos may exist for this station.
 HV2037
 HV2037.The dynamic height is computed by dividing the NAVD 88
 HV2037.geopotential number by the normal gravity value computed on the
 HV2037.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2037.degrees latitude (g = 980.6199 gals.).
 HV2037
 HV2037.The modeled gravity was interpolated from observed gravity values.
 HV2037
 HV2037;                    North         East    Units  Estimated Accuracy
 HV2037;SPC MD       -   131,140.      398,260.      MT  (+/- 180 meters Scaled)
 HV2037
 HV2037_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ247018(NAD 83)
 HV2037
 HV2037                          SUPERSEDED SURVEY CONTROL
 HV2037
 HV2037  NAD 27      -  38 50 52.51000(N)    077 01 13.37000(W) AD(       ) 3
 HV2037  NGVD 29               3.21   (m)           10.5    (f) LEVELING    3  
 HV2037  NGVD 29 (11/26/84)    3.210  (m)           10.53   (f) ADJUSTED    1 2
 HV2037
 HV2037.Superseded values are not recommended for survey control.
 HV2037
 HV2037.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2037.See file dsdata.pdf to determine how the superseded data were derived.
 HV2037
 HV2037_MARKER: DS = TRIANGULATION STATION DISK
 HV2037_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2037_SP_SET: CULVERT
 HV2037_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2037
 HV2037  HISTORY     - Date     Condition        Report By
 HV2037  HISTORY     - 1937     MONUMENTED       CGS
 HV2037  HISTORY     - 1944     GOOD             CGS
 HV2037  HISTORY     - 1953     GOOD             CGS
 HV2037  HISTORY     - 1965     MARK NOT FOUND   CGS
 HV2037
 HV2037                          STATION DESCRIPTION
 HV2037
 HV2037'DESCRIBED BY COAST AND GEODETIC SURVEY 1937 (LOC)
 HV2037'THIS STATION IS A STANDARD BRASS DISK SET IN THE TOP OF THE
 HV2037'CONCRETE N WING WALL OF THE FIRST CULVERT DOWNSTREAM FROM THE S
 HV2037'END OF THE SEA WALL.  THE STATION IS ABOUT 12 FEET ABOVE HIGH WATER
 HV2037'AND ABOUT 200 FEET UPSTREAM FROM THE GRAVEL PIT.  IT IS REFERENCED
 HV2037'TO THE CENTER PIPE OF THE LIGHT BOX AT BOLLING FIELD 87.8 FEET
 HV2037'123 DEG 15 MIN FROM SE BASE.  THE STATION IS ON THE RANGE
 HV2037'LINCOLN MEMORIAL OVER FIRST SPAN E OF DRAW ON RAILROAD BRIDGE.
 HV2037'OBJECTS OBSERVED WITH SE BASE AS INITIAL--OLD P.O. 3 DEG 35
 HV2037'MIN, CAPITOL 22 DEG 26 MIN, MASONIC MEMORIAL (ALEXANDRIA) 232
 HV2037'DEG 18 MIN, WASHINGTON MONUMENT, 355 DEG 50 MIN.
 HV2037
 HV2037                          STATION RECOVERY (1944)
 HV2037
 HV2037'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV2037'IN WASHINGTON.
 HV2037'IN SOUTHEAST WASHINGTON, AT THE NORTH EDGE OF BOLLING AIR
 HV2037'FORCE BASE, 900 FEET SOUTH OF THE NORTHWEST CORNER OF THE FIELD,
 HV2037'20 FEET WEST OF THE CENTERLINE OF DARGUE AVENUE, 12.6 FEET
 HV2037'FROM THE FENCE, AT A SEWER OUTLET, AND IN THE TOP OF THE
 HV2037'NORTHEAST CORNER OF THE CONCRETE HEADWALL.  A STANDARD
 HV2037'TRIANGULATION-STATION DISK.
 HV2037
 HV2037                          STATION RECOVERY (1953)
 HV2037
 HV2037'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1953 (JHB)
 HV2037'STATION WAS RECOVERED USING THE 1937 DESCRIPTION.  A NEW
 HV2037'DESCRIPTION IS REQUIRED AS FOLLOWS--
 HV2037'
 HV2037'STATION IS LOCATED IN THE TOP OF THE N CONCRETE WING WALL OF
 HV2037'THE SECOND CULVERT DOWNSTREAM, ABOUT 150 YDS. FROM THE S END OF
 HV2037'THE SEAWALL.  IT IS ABOUT 12 FT. ABOVE HIGH WATER.  THE CULVERT IS
 HV2037'NOT BEING USED AS SUCH AND WAS PARTIALLY COVERED WITH EARTH WHEN
 HV2037'FOUND.  THE STATION IS LOCATED 12 FT. INSIDE THE HEAVY WIRE
 HV2037'MESH FENCE SURROUNDING BOLLING AIRFIELD.
 HV2037
 HV2037                          STATION RECOVERY (1965)
 HV2037
 HV2037'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1965 (DCW)
 HV2037'SEARCHED FOR BUT COULD NOT RECOVER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV3982 ***********************************************************************
 HV3982  DESIGNATION -  FILTER WSSD 1935
 HV3982  PID         -  HV3982
 HV3982  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV3982  COUNTRY     -  US
 HV3982  USGS QUAD   -  WASHINGTON WEST (2016)
 HV3982
 HV3982                         *CURRENT SURVEY CONTROL
 HV3982  ______________________________________________________________________
 HV3982* NAD 83(1993) POSITION- 38 56 15.21863(N) 077 06 46.83317(W)   ADJUSTED
 HV3982* NAVD 88 ORTHO HEIGHT -    46.    (meters)      151.    (feet) SCALED
 HV3982  ______________________________________________________________________
 HV3982  GEOID HEIGHT    -        -31.913 (meters)                     GEOID18
 HV3982  LAPLACE CORR    -         -1.85  (seconds)                    DEFLEC18
 HV3982  HORZ ORDER      -  SECOND
 HV3982
 HV3982.The horizontal coordinates were established by classical geodetic methods
 HV3982.and adjusted by the National Geodetic Survey in November 1994.
 HV3982
 HV3982.The orthometric height was scaled from a topographic map.
 HV3982
 HV3982.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV3982.GEOID18 height accuracy estimate available here.
 HV3982
 HV3982.Click photographs - Photos may exist for this station.
 HV3982
 HV3982.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV3982
 HV3982. The following values were computed from the NAD 83(1993) position.
 HV3982
 HV3982;                    North         East     Units Scale Factor Converg.
 HV3982;SPC MD       -   141,080.922   390,202.308   MT  0.99995043   -0 04 15.3
 HV3982;SPC MD       -   462,862.99  1,280,188.74   sFT  0.99995043   -0 04 15.3
 HV3982;SPC VA N     - 2,141,978.146 3,620,246.642   MT  0.99996395   +0 51 56.3
 HV3982;SPC VA N     - 7,027,473.30 11,877,425.86   sFT  0.99996395   +0 51 56.3
 HV3982;UTM  18      - 4,311,970.546   316,861.310   MT  1.00001301   -1 19 42.0
 HV3982
 HV3982!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV3982!SPC MD       -   0.99999782  x   0.99995043  =   0.99994825
 HV3982!SPC VA N     -   0.99999782  x   0.99996395  =   0.99996177
 HV3982!UTM  18      -   0.99999782  x   1.00001301  =   1.00001083
 HV3982
 HV3982:                Primary Azimuth Mark                     Grid Az
 HV3982:SPC MD       -  MARCY                                    258 44 43.3
 HV3982:SPC VA N     -  MARCY                                    257 48 31.7
 HV3982:UTM  18      -  MARCY                                    260 00 10.0
 HV3982
 HV3982_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1686111970(NAD 83)
 HV3982
 HV3982|---------------------------------------------------------------------|
 HV3982| PID    Reference Object                     Distance      Geod. Az  |
 HV3982|                                                           dddmmss.s |
 HV3982| HV4828 MARCY                               APPROX. 1.2 KM 2584028.0 |
 HV3982|---------------------------------------------------------------------|
 HV3982
 HV3982                          SUPERSEDED SURVEY CONTROL
 HV3982
 HV3982  NAD 83(1991)-  38 56 15.21765(N)    077 06 46.83480(W) AD(       ) 2
 HV3982  NAD 83(1986)-  38 56 15.21748(N)    077 06 46.84461(W) AD(       ) 2
 HV3982  NAD 27      -  38 56 14.81900(N)    077 06 47.91400(W) AD(       ) 2
 HV3982
 HV3982.Superseded values are not recommended for survey control.
 HV3982
 HV3982.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV3982.See file dsdata.pdf to determine how the superseded data were derived.
 HV3982
 HV3982_MARKER: Z = SEE DESCRIPTION
 HV3982_SETTING: 0 = UNSPECIFIED SETTING
 HV3982_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV3982
 HV3982  HISTORY     - Date     Condition        Report By
 HV3982  HISTORY     - 1935     MONUMENTED       WSSC
 HV3982  HISTORY     - 1938     GOOD             CGS
 HV3982  HISTORY     - 1946     GOOD             CGS
 HV3982  HISTORY     - 1946     GOOD             CGS
 HV3982  HISTORY     - 1956     GOOD             CGS
 HV3982  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV3982
 HV3982                          STATION DESCRIPTION
 HV3982
 HV3982'DESCRIBED BY WASH SUBURB SAN COMM 1935 (JHB)
 HV3982'STATION IS IN THE SW CORNER OF DALECARLIA WATER PLANT ROOF, 0.895
 HV3982'METER N OF S OUTER EDGE OF COPING, 0.789 METER E OF W OUTER EDGE
 HV3982'OF COPING, 7.292 METERS W OF WASHINGTON SUBURBAN SANITARY
 HV3982'DISTRICT AND NATIONAL PARK SERVICE TRIANGULATION STATION FILTER
 HV3982'WHICH IS 318 DEG 23 MIN 32.5 SEC TO THE RIGHT OF BATTERY.
 HV3982'
 HV3982'THE STATION IS MARKED WITH A CROSS (X) SCRATCHED ON THE COPPER
 HV3982'ROOF.
 HV3982'
 HV3982'TRIANGULATION STATIONS HOLE, IN, CHAIN 2 AND RAPID ARE ALL LESS
 HV3982'THAN 1/2 MILE DISTANT AND CAN BE USED FOR AZIMUTH MARKS.
 HV3982'
 HV3982'HEIGHT OF LIGHT ABOVE STATION MARK 1.5 METERS.
 HV3982
 HV3982                          STATION RECOVERY (1938)
 HV3982
 HV3982'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV3982'ROOF OF BUILDING WAS NOT VISITED, BUT FROM THE GROUND THERE APPEARS
 HV3982'TO HAVE BEEN NO CONSTRUCTION SINCE THE ESTABLISHMENT OF THE
 HV3982'STATION WHICH WOULD PREVENT RECOVERY FROM THE REFERENCE TIES GIVEN
 HV3982'IN THE DESCRIPTION.
 HV3982
 HV3982                          STATION RECOVERY (1946)
 HV3982
 HV3982'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV3982'FIRST PART OF DESCRIPTION SHOULD READ STATION IS IN THE SW
 HV3982'CORNER OF ROOF OF ELEVATOR TOWER.  OTHERWISE, AS DESCRIBED.
 HV3982
 HV3982                          STATION RECOVERY (1946)
 HV3982
 HV3982'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (RCB)
 HV3982'STATION WAS RECOVERED AS DESCRIBED AND MARK WAS IN GOOD
 HV3982'CONDITION.  COMPLETE NEW DESCRIPTION FOLLOWS--THE STATION IS
 HV3982'LOCATED ON THE SW CORNER OF THE DALECARLIA FILTRATION PLANT
 HV3982'ROOF.  IT IS 0.895 METER N OF THE S EDGE OF THE OTHER COPING,
 HV3982'0.789 METER E OF THE W EDGE OF THE OUTER COPING.  THE STATION IS
 HV3982'MARKED WITH A CROSS (X) SCRATCHED IN THE COPPER ROOF.
 HV3982
 HV3982                          STATION RECOVERY (1956)
 HV3982
 HV3982'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956 (MLC)
 HV3982'THE STATION WAS RECOVERED AND FOUND TO BE IN GOOD CONDITION,
 HV3982'ALTHOUGH THE X IN THE FLASHING IS NOT TOO DISTINCT.  IT CAN BE
 HV3982'EASILY LOCATED FROM THE MEASUREMENTS LISTED IN THE PREVIOUS
 HV3982'DESCRIPTIONS.
 HV3982
 HV3982                          STATION RECOVERY (1971)
 HV3982
 HV3982'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV3982'THE STATION MARK WAS NOT FOUND BECAUSE THE ROOF HAS BEEN TARRED
 HV3982'OVER, HOWEVER THE TOWER AND RAILING IS STILL THE SAME, SO THE
 HV3982'STATION COULD BE RECOVERED IF NEEDED, FROM PUBLISHED REFERENCE
 HV3982'DISTANCES.
 HV3982'
 HV3982'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV3982'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4313 ***********************************************************************
 HV4313  DESIGNATION -  FINISH
 HV4313  PID         -  HV4313
 HV4313  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4313  COUNTRY     -  US
 HV4313  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4313
 HV4313                         *CURRENT SURVEY CONTROL
 HV4313  ______________________________________________________________________
 HV4313* NAD 83(1993) POSITION- 38 53 14.16449(N) 077 03 34.74033(W)   ADJUSTED
 HV4313* NAVD 88 ORTHO HEIGHT -     3.    (meters)       10.    (feet) SCALED
 HV4313  ______________________________________________________________________
 HV4313  GEOID HEIGHT    -        -32.060 (meters)                     GEOID18
 HV4313  LAPLACE CORR    -         -2.86  (seconds)                    DEFLEC18
 HV4313  HORZ ORDER      -  THIRD
 HV4313
 HV4313.The horizontal coordinates were established by classical geodetic methods
 HV4313.and adjusted by the National Geodetic Survey in November 1994.
 HV4313
 HV4313.The orthometric height was scaled from a topographic map.
 HV4313
 HV4313.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4313.GEOID18 height accuracy estimate available here.
 HV4313
 HV4313.Click photographs - Photos may exist for this station.
 HV4313
 HV4313.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4313
 HV4313. The following values were computed from the NAD 83(1993) position.
 HV4313
 HV4313;                    North         East     Units Scale Factor Converg.
 HV4313;SPC MD       -   135,493.630   394,824.797   MT  0.99994987   -0 02 14.8
 HV4313;SPC MD       -   444,532.02  1,295,354.35   sFT  0.99994987   -0 02 14.8
 HV4313;SPC VA N     - 2,136,467.086 3,624,959.887   MT  0.99995944   +0 53 56.2
 HV4313;SPC VA N     - 7,009,392.43 11,892,889.23   sFT  0.99995944   +0 53 56.2
 HV4313;UTM  18      - 4,306,282.921   321,360.389   MT  0.99999297   -1 17 36.1
 HV4313
 HV4313!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4313!SPC MD       -   1.00000460  x   0.99994987  =   0.99995447
 HV4313!SPC VA N     -   1.00000460  x   0.99995944  =   0.99996404
 HV4313!UTM  18      -   1.00000460  x   0.99999297  =   0.99999757
 HV4313
 HV4313:                Primary Azimuth Mark                     Grid Az
 HV4313:SPC MD       -  HEURICHS BREWERY FINIAL                  033 22 51.5
 HV4313:SPC VA N     -  HEURICHS BREWERY FINIAL                  032 26 40.5
 HV4313:UTM  18      -  HEURICHS BREWERY FINIAL                  034 38 12.8
 HV4313
 HV4313_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2136006282(NAD 83)
 HV4313
 HV4313|---------------------------------------------------------------------|
 HV4313| PID    Reference Object                     Distance      Geod. Az  |
 HV4313|                                                           dddmmss.s |
 HV4313| HV4301 HEURICHS BREWERY FINIAL             APPROX. 1.0 KM 0332036.7 |
 HV4313|---------------------------------------------------------------------|
 HV4313
 HV4313                          SUPERSEDED SURVEY CONTROL
 HV4313
 HV4313  NAD 83(1991)-  38 53 14.16316(N)    077 03 34.74188(W) AD(       ) 3
 HV4313  NAD 83(1986)-  38 53 14.16289(N)    077 03 34.75234(W) AD(       ) 3
 HV4313  NAD 27      -  38 53 13.75300(N)    077 03 35.83800(W) AD(       ) 3
 HV4313
 HV4313.Superseded values are not recommended for survey control.
 HV4313
 HV4313.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4313.See file dsdata.pdf to determine how the superseded data were derived.
 HV4313
 HV4313_MARKER: DE = TRAVERSE STATION DISK
 HV4313_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV4313_STAMPING: FINISH 1935
 HV4313_MARK LOGO: CGS
 HV4313_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV4313+STABILITY: SURFACE MOTION
 HV4313
 HV4313  HISTORY     - Date     Condition        Report By
 HV4313  HISTORY     - 1935     MONUMENTED       CGS
 HV4313  HISTORY     - 1946     MARK NOT FOUND   CGS
 HV4313  HISTORY     - 1948     MARK NOT FOUND   CGS
 HV4313  HISTORY     - 20120603 MARK NOT FOUND   NGS
 HV4313
 HV4313                          STATION DESCRIPTION
 HV4313
 HV4313'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (LOC)
 HV4313'THIS TRAVERSE STATION IS A STANDARD BRONZE DISK STAMPED FINISHED
 HV4313'1935 SET IN THE TOP OF A CONCRETE MONUMENT, 9 INCHES SQUARE AT
 HV4313'THE TOP, 15 INCHES SQUARE AT THE BOTTOM, AND 40 INCHES DEEP,
 HV4313'WITH THE MARK 9 INCHES ABOVE THE GROUND LEVEL (A 2 1/2-BY 7-INCH
 HV4313'BY 6-FOOT OAK PLANK WAS DRIVEN IN THE BOTTOM OF THE HOLE LEAVING
 HV4313'ABOUT 6 INCHES PROTRUDING, WHICH WAS SURROUNDED BY THE CONCRETE
 HV4313'OF THE MONUMENT) ON THE EASTERN SIDE OF THE COLUMBIA ISLAND
 HV4313'ABOUT 430 FEET NNW OF THE NORTHERN SIDE OF THE ARLINGTON END
 HV4313'OF THE ARLINGTON MEMORIAL BRIDGE.  MARK IS ON THE EDGE OF THE
 HV4313'SECOND NATURAL TERRACE ABOUT 13-1/2 FEET ABOVE THE RIVER LEVEL AND
 HV4313'42 FEET FROM HIGH-WATER LINE, INCLINED DISTANCE.  THE LEVEL
 HV4313'DISTANCE BETWEEN THE FIRST AND SECOND NATURAL TERRACES IS
 HV4313'ABOUT 21 FEET WHILE THE LEVEL DISTANCE BETWEEN THE SECOND AND
 HV4313'THIRD NATURAL TERRACES IS ABOUT 200 FEET, AND THE TOP OF THE
 HV4313'THIRD NATURAL TERRACE ABOVE THE RIVER LEVEL IS ALMOST LEVEL
 HV4313'WITH THE ARLINGTON SIDE OF THE ARLINGTON MEMORIAL BRIDGE.
 HV4313'FROM THE MARK THE WASHINGTON MONUMENT IS IN LINE WITH THE
 HV4313'CENTER WITH THE 4TH ARCH OUT FROM THE WASHINGTON SIDE OF
 HV4313'THE ARLINGTON MEMORIAL BRIDGE (4TH ARCH IS THE 1ST ARCH E OF
 HV4313'THE DRAW.) THIS MARK AND COURSE MAKE THE LINE COURSE-FINISH
 HV4313'WHICH IS THE FINISH LINE OF THE 1 MILE SPEEDBOAT RACE COURSE.
 HV4313'
 HV4313'THE LINE COURSE-FINICH IS 90 DEG TO THE AXIS OF THE RACE
 HV4313'COURSE.
 HV4313'
 HV4313'NOTE.--DISTANCE MEASURED ON THE GROUND OR SLOPE AS CASE MAY BE.
 HV4313
 HV4313                          STATION RECOVERY (1946)
 HV4313
 HV4313'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4313'STATION SEARCHED FOR BUT NOT FOUND.  GROUND HAS BEEN GRADED
 HV4313'EXTENSIVELY AND THE STATION MAY HAVE BEEN REMOVED.
 HV4313
 HV4313                          STATION RECOVERY (1948)
 HV4313
 HV4313'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1948 (RJS)
 HV4313'STATION NOT RECOVERED.  PLANETABLE WAS USED IN SEARCH FOR THIS
 HV4313'MONUMENT WITHOUT SUCCESS. THE TERRAIN AROUND THE STATION HAS
 HV4313'BEEN GRADED EXTENSIVELY SINCE 1935.
 HV4313
 HV4313                          STATION RECOVERY (2012)
 HV4313
 HV4313'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (JRO)
 HV4313'THE POSITION OF THE MARK WAS ESTABLISHED BY OPUS-RS OBSERVATION.  A
 HV4313'HOLE 2 FT (0.6 M) WIDE AND EQUALLY DEEP WAS DUG AND PROBED ANOTHER 1.5
 HV4313'FT (0.5 M) AS WELL AS SEARCHED BY METAL DETECTOR.  NO MARK WAS FOUND.
 HV4313'THIS LOCATION DOES MATCH THE TOPO CALL FOR LINING UP WITH THE
 HV4313'WASHINGTON MONUMENT AND THE FOURTH ARCH OF THE MEMORIAL BRIDGE.  THERE
 HV4313'IS NO PUBLISHED HEIGHT.  THE MARK COULD BE BURIED DEEPER.
 HV4313'
 HV4313'ONE CAN REACH THE AREA BY PULLING OFF THE NORTH-BOUND GW PARKWAY ONTO
 HV4313'THE GRASS.  THE POSITION IS ABOUT 40 FT (12.2 M) SOUTHWEST OF THE
 HV4313'SOUTHWEST CURB OF THE PARKWAY LANES THAT ARE CLOSEST TO THE POTOMAC
 HV4313'RIVER.  IT IS IN A GRASS ISLAND ABOUT 1000 FT (304.8 M) LONG BETWEEN
 HV4313'TWO SETS OF LANES OF THE PARKWAY, ABOUT 500 FT (152.4 M) NORTH OF THE
 HV4313'MEMORIAL BRIDGE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1872 ***********************************************************************
 HV1872  DESIGNATION -  FLOOD MARK=TIDAL BM
 HV1872  PID         -  HV1872
 HV1872  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1872  COUNTRY     -  US
 HV1872  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1872
 HV1872                         *CURRENT SURVEY CONTROL
 HV1872  ______________________________________________________________________
 HV1872* NAD 83(1986) POSITION- 38 54 07.     (N) 077 03 42.     (W)   SCALED
 HV1872* NAVD 88 ORTHO HEIGHT -     4.61  (+/-2cm)       15.1   (feet) VERTCON3
 HV1872  ______________________________________________________________________
 HV1872  GEOID HEIGHT    -        -32.032 (meters)                     GEOID18
 HV1872  VERT ORDER      -  ? (See Below)
 HV1872
 HV1872.The horizontal coordinates were scaled from a map and have
 HV1872.an estimated accuracy of +/- 6 seconds.
 HV1872
 HV1872.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1872.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1872
 HV1872.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1872.GEOID18 height accuracy estimate available here.
 HV1872
 HV1872.The vertical order pertains to the NGVD 29 superseded value.
 HV1872
 HV1872.Click photographs - Photos may exist for this station.
 HV1872
 HV1872
 HV1872_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ212079(NAD 83)
 HV1872
 HV1872                          SUPERSEDED SURVEY CONTROL
 HV1872
 HV1872  NGVD 29 (11/26/84)    4.849  (m)           15.91   (f) ADJUSTED       
 HV1872
 HV1872.Superseded values are not recommended for survey control.
 HV1872
 HV1872.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1872.See file dsdata.pdf to determine how the superseded data were derived.
 HV1872
 HV1872_MARKER: DJ = TIDAL STATION DISK
 HV1872_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1872_SP_SET: GAGE HOUSE
 HV1872_STAMPING: MARCH 19 1936
 HV1872_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1872
 HV1872  HISTORY     - Date     Condition        Report By
 HV1872  HISTORY     - 1936     MONUMENTED       USGS
 HV1872  HISTORY     - 1941     GOOD             CGS
 HV1872  HISTORY     - 1947     GOOD             CGS
 HV1872
 HV1872                          STATION DESCRIPTION
 HV1872
 HV1872'DESCRIBED BY COAST AND GEODETIC SURVEY 1941
 HV1872'AT GEORGETOWN.
 HV1872'AT GEORGETOWN, WASHINGTON, D.C., AT THE FOOT OF WISCONSIN AVENUE
 HV1872'NORTHWEST, BELOW K STREET, AT THE U.S. GEOLOGICAL SURVEY GAGE HOUSE,
 HV1872'IN THE EAST CONCRETE WALL, NEAR THE CLEAN-OUT DOOR, AND ABOUT 4
 HV1872'FEET ABOVE THE GROUND.  A UNITED STATES GEOLOGICAL SURVEY
 HV1872'STANDARD FLOODMARK DISK, STAMPED MARCH 19 1936 AND SET VERTICALLY.
 HV1872
 HV1872                          STATION RECOVERY (1947)
 HV1872
 HV1872'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947
 HV1872'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI7405 ***********************************************************************
 AI7405  DESIGNATION -  FOSTER
 AI7405  PID         -  AI7405
 AI7405  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI7405  COUNTRY     -  US
 AI7405  USGS QUAD   -  WASHINGTON WEST (2016)
 AI7405
 AI7405                         *CURRENT SURVEY CONTROL
 AI7405  ______________________________________________________________________
 AI7405* NAD 83(2011) POSITION- 38 55 20.23014(N) 077 04 00.99122(W)   ADJUSTED
 AI7405* NAD 83(2011) ELLIP HT-    49.527 (meters)        (06/27/12)   ADJUSTED
 AI7405* NAD 83(2011) EPOCH   -  2010.00
 AI7405* NAVD 88 ORTHO HEIGHT -    81.54  (meters)      267.5   (feet) LEVELING
 AI7405  ______________________________________________________________________
 AI7405  GEOID HEIGHT    -        -31.988 (meters)                     GEOID18
 AI7405  NAD 83(2011) X  -  1,112,077.409 (meters)                     COMP
 AI7405  NAD 83(2011) Y  - -4,842,743.536 (meters)                     COMP
 AI7405  NAD 83(2011) Z  -  3,985,639.723 (meters)                     COMP
 AI7405  LAPLACE CORR    -         -2.99  (seconds)                    DEFLEC18
 AI7405  VERT ORDER      -  THIRD ?
 AI7405
 AI7405  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AI7405  Standards:
 AI7405         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AI7405            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AI7405  -------------------------------------------------------------------
 AI7405  NETWORK    0.22   0.74           0.10   0.08   0.38      0.02432354
 AI7405  -------------------------------------------------------------------
 AI7405  Click here for local accuracies and other accuracy information.
 AI7405
 AI7405.The horizontal coordinates were established by GPS observations
 AI7405.and adjusted by the National Geodetic Survey in June 2012.
 AI7405
 AI7405.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AI7405.been affixed to the stable North American tectonic plate. See 
 AI7405.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AI7405
 AI7405.The horizontal coordinates are valid at the epoch date displayed above
 AI7405.which is a decimal equivalence of Year/Month/Day.
 AI7405
 AI7405.The orthometric height was determined by differential leveling.
 AI7405.The vertical network tie was performed by a horz. field party for horz.
 AI7405.obs reductions. Reset procedures were used to establish the elevation.
 AI7405
 AI7405.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI7405.GEOID18 height accuracy estimate available here.
 AI7405
 AI7405.Click photographs - Photos may exist for this station.
 AI7405
 AI7405.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AI7405
 AI7405.The Laplace correction was computed from DEFLEC18 derived deflections.
 AI7405
 AI7405.The ellipsoidal height was determined by GPS observations
 AI7405.and is referenced to NAD 83.
 AI7405
 AI7405. The following values were computed from the NAD 83(2011) position.
 AI7405
 AI7405;                    North         East     Units Scale Factor Converg.
 AI7405;UTM  18      - 4,310,183.714   320,815.972   MT  0.99999537   -1 17 56.2
 AI7405
 AI7405!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AI7405!UTM  18      -   0.99999223  x   0.99999537  =   0.99998760
 AI7405
 AI7405_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2081510183(NAD 83)
 AI7405
 AI7405                          SUPERSEDED SURVEY CONTROL
 AI7405
 AI7405  NAD 83(2007)-  38 55 20.23036(N)    077 04 00.99193(W) AD(2002.00) 0
 AI7405  ELLIP H (02/10/07)   49.542  (m)                       GP(2002.00)    
 AI7405  ELLIP H (08/09/02)   49.549  (m)                       GP(       ) 3 2
 AI7405  NAD 83(1991)-  38 55 20.23043(N)    077 04 00.99215(W) AD(       ) B
 AI7405  ELLIP H (08/03/00)   49.541  (m)                       GP(       ) 2 1
 AI7405
 AI7405.Superseded values are not recommended for survey control.
 AI7405
 AI7405.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AI7405.See file dsdata.pdf to determine how the superseded data were derived.
 AI7405
 AI7405_MARKER: F = FLANGE-ENCASED ROD
 AI7405_SETTING: 59 = STAINLESS STEEL ROD IN SLEEVE (10 FT.+)
 AI7405_STAMPING: FOSTER 1997
 AI7405_MARK LOGO: NGS
 AI7405_PROJECTION: FLUSH
 AI7405_MAGNETIC: N = NO MAGNETIC MATERIAL
 AI7405_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 AI7405_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AI7405+SATELLITE: SATELLITE OBSERVATIONS - 1997
 AI7405_ROD/PIPE-DEPTH: 7.7 meters
 AI7405_SLEEVE-DEPTH  : 0.9 meters
 AI7405
 AI7405  HISTORY     - Date     Condition        Report By
 AI7405  HISTORY     - 1997     MONUMENTED       NGS
 AI7405
 AI7405                          STATION DESCRIPTION
 AI7405
 AI7405'DESCRIBED BY NATIONAL GEODETIC SURVEY 1997 (RWA)
 AI7405'2.75 MILES (4.43 KM) SOUTHEAST ALONG MASSACHUSETTS AVENUE FROM THE
 AI7405'INTERSECTION WITH WESTERN AVENUE AT WESTMORELAND CIRCLE AT THE
 AI7405'MARYLAND AND DISTRICT OF COLUMBIA STATE LINE TO THE INTERSECTION OF
 AI7405'OBSERVATORY CIRCLE NORTHWEST, THENCE 0.2 MILE (0.3 KM) NORTHWEST ALONG
 AI7405'OBSERVATORY CIRCLE NORTHWEST TO THE GUARD HOUSE, THENCE 0.5 MILE (0.8
 AI7405'KM) NORTH ALONG A PAVED ROAD TO THE TOP OF INCLINE TO THE SECOND
 AI7405'SIDEWALK LEADING TO THE ENTRANCE OF BUILDING NUMBER 52, CONTINUE 0.1
 AI7405'MILE (0.2 KM) IN NORTHERLY DIRECTION FOLLOWING THE ROAD PASSING
 AI7405'BUILDING NUMBER 59 ON LEFT TO A T INTERSECTION, THENCE 0.3 MILE (0.5
 AI7405'KM) EASTERLY FOLLOWING THE PAVED ROAD ALONG A ONE WAY ROAD AROUND
 AI7405'BUILDING NUMBER 1 TO THE FRONT OF BUILDING AND A CIRCLE, THENCE
 AI7405'NORTHERLY 0.02 MILE (0.03 KM) TO THE FIFTH AND SIXTH TREES ON LEFT,
 AI7405'TURN LEFT (NORTHWEST) BETWEEN THESE TREES AND GO ACROSS LAWN 0.04 MILE
 AI7405'(0.06 KM) TOWARDS DOME BUILDING 87, CROSSING OVER 2 SIDEWALKS TO THE
 AI7405'3RD SIDEWALK AND MARK, 7.0 FEET (2.1 M) SOUTHEAST OF SOUTHEAST EDGE OF
 AI7405'SIDEWALK, 68.1 FEET (20.8 M) EAST OF EAST SIDE OF OBSERVATORY DOME
 AI7405'BUILDING NUMBER 87, 50.8 FEET (15.5 M) SOUTH OF SOUTHEAST CORNER OF A
 AI7405'5.5 BY 7.5 FOOT (2.3 M) CONCRETE PAD, 35.5 FEET (10.8 M) NORTHEAST OF
 AI7405'NORTHEAST CORNER OF A 5.5 X 7.5 FOOT CONCRETE PAD, AND 69.10 FEET EAST
 AI7405'OF SOUTHWEST CORNER OF A 5.5 X 7.5 FOOT CONCRETE PAD, WHICH ALL 3 PADS
 AI7405'HAVE A METAL ACCESS PANEL. NOTE-- ACCESS TO THE DATUM POINT (A
 AI7405'CENTERING CAP DRIVEN ON TOP OF THE ROD) IS THROUGH A 5-INCH LOGO CAP.
 AI7405'THE SLEEVE DEPTH OF 0.9 METER DOES NOT MEET THE SPECIFICATIONS FOR A
 AI7405'CLASS A MARK. THE ROD WAS DRIVEN TO REFUSAL. NOTE--CONTACT HEAD OF
 AI7405'EARTH ORIENTATION DEPT. (JIM RAY) AT 202-762-1444 BEFORE ENTERING
 AI7405'OBSERVATORY GROUNDS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9832 ***********************************************************************
 HV9832  DESIGNATION -  FOX GPS E809
 HV9832  PID         -  HV9832
 HV9832  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9832  COUNTRY     -  US
 HV9832  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9832
 HV9832                         *CURRENT SURVEY CONTROL
 HV9832  ______________________________________________________________________
 HV9832* NAD 83(2011) POSITION- 38 55 01.58085(N) 077 01 54.39691(W)   ADJUSTED
 HV9832* NAD 83(2011) ELLIP HT-    -1.200 (meters)        (06/27/12)   ADJUSTED
 HV9832* NAD 83(2011) EPOCH   -  2010.00
 HV9832* NAVD 88 ORTHO HEIGHT -    30.9   (meters)      101.    (feet) VERTCON3
 HV9832  ______________________________________________________________________
 HV9832  GEOID HEIGHT    -        -32.039 (meters)                     GEOID18
 HV9832  NAD 83(2011) X  -  1,115,121.638 (meters)                     COMP
 HV9832  NAD 83(2011) Y  - -4,842,373.707 (meters)                     COMP
 HV9832  NAD 83(2011) Z  -  3,985,160.416 (meters)                     COMP
 HV9832  LAPLACE CORR    -         -2.17  (seconds)                    DEFLEC18
 HV9832
 HV9832  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV9832  Standards:
 HV9832         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV9832            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV9832  -------------------------------------------------------------------
 HV9832  NETWORK    1.42   2.21           0.56   0.58   1.13      0.32280484
 HV9832  -------------------------------------------------------------------
 HV9832  Click here for local accuracies and other accuracy information.
 HV9832
 HV9832.The horizontal coordinates were established by GPS observations
 HV9832.and adjusted by the National Geodetic Survey in June 2012.
 HV9832
 HV9832.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV9832.been affixed to the stable North American tectonic plate. See 
 HV9832.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV9832
 HV9832.The horizontal coordinates are valid at the epoch date displayed above
 HV9832.which is a decimal equivalence of Year/Month/Day.
 HV9832
 HV9832.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV9832.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV9832
 HV9832.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9832.GEOID18 height accuracy estimate available here.
 HV9832
 HV9832.Click photographs - Photos may exist for this station.
 HV9832
 HV9832.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV9832
 HV9832.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9832
 HV9832.The ellipsoidal height was determined by GPS observations
 HV9832.and is referenced to NAD 83.
 HV9832
 HV9832. The following values were computed from the NAD 83(2011) position.
 HV9832
 HV9832;                    North         East     Units Scale Factor Converg.
 HV9832;SPC MD       -   138,804.664   397,244.208   MT  0.99995011   -0 01 11.8
 HV9832;SPC MD       -   455,394.97  1,303,292.04   sFT  0.99995011   -0 01 11.8
 HV9832;SPC VA N     - 2,139,817.250 3,627,324.893   MT  0.99996202   +0 54 58.8
 HV9832;SPC VA N     - 7,020,383.76 11,900,648.42   sFT  0.99996202   +0 54 58.8
 HV9832;UTM  18      - 4,309,540.234   323,851.908   MT  0.99998208   -1 16 36.1
 HV9832
 HV9832!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9832!SPC MD       -   1.00000019  x   0.99995011  =   0.99995030
 HV9832!SPC VA N     -   1.00000019  x   0.99996202  =   0.99996221
 HV9832!UTM  18      -   1.00000019  x   0.99998208  =   0.99998227
 HV9832
 HV9832_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2385109540(NAD 83)
 HV9832
 HV9832|---------------------------------------------------------------------|
 HV9832| PID    Reference Object                     Distance      Geod. Az  |
 HV9832|                                                           dddmmss.s |
 HV9832| HV9833 HAGGINS GPS E808                    332.308 METERS 09006     |
 HV9832|---------------------------------------------------------------------|
 HV9832
 HV9832                          SUPERSEDED SURVEY CONTROL
 HV9832
 HV9832  NAD 83(2007)-  38 55 01.58148(N)    077 01 54.39772(W) AD(2002.00) 0
 HV9832  ELLIP H (02/10/07)   -1.187  (m)                       GP(2002.00)    
 HV9832  ELLIP H (08/30/02)   -1.189  (m)                       GP(       ) 4 2
 HV9832  NAD 83(1993)-  38 55 01.58189(N)    077 01 54.39757(W) AD(       ) 1
 HV9832  ELLIP H (11/14/94)   -1.195  (m)                       GP(       ) 4 2
 HV9832  NAD 83(1991)-  38 55 01.58128(N)    077 01 54.39774(W) AD(       ) 1
 HV9832  NGVD 29 (11/30/93)   31.1    (m)  GEOID93  model used  GPS OBS        
 HV9832
 HV9832.Superseded values are not recommended for survey control.
 HV9832
 HV9832.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9832.See file dsdata.pdf to determine how the superseded data were derived.
 HV9832
 HV9832_MARKER: DD = SURVEY DISK
 HV9832_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV9832_SP_SET: FLUSH IN SIDEWALK
 HV9832_STAMPING: FOX GPS E809 9-92
 HV9832_MARK LOGO: DEWDAV
 HV9832_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9832_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9832_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV9832+SATELLITE: SATELLITE OBSERVATIONS - February 28, 2014
 HV9832
 HV9832  HISTORY     - Date     Condition        Report By
 HV9832  HISTORY     - 1992     MONUMENTED       DEWDAV
 HV9832  HISTORY     - 20030824 GOOD             GEOCAC
 HV9832  HISTORY     - 20140228 GOOD             INDIV
 HV9832
 HV9832                          STATION DESCRIPTION
 HV9832
 HV9832'DESCRIBED BY DEWBERRY DAVIS 1992
 HV9832'STATION IS LOCATED IN DOWNTOWN WASHINGTON, DISTRICT OF COLUMBIA.
 HV9832'TO REACH STATION PROCEED TO INTERSECTION OF 14TH STREET NORTHWEST AND
 HV9832'U STREET NORTHWEST. STATION IS STANDARD 2.5 INCH DIAMETER BRASS METRO
 HV9832'DISK SET IN SIDEWALK IN NORTHEAST QUADRANT OF SAID INTERSECTION.
 HV9832'STATION IS 343.622 FT (104.736 M) SOUTH 00-13-12 EAST OF METRO CONTROL
 HV9832'POINT E903 ON 14TH STREET, 122.015 FT (37.190 M) NORTH OF REFERENCE
 HV9832'DISK A, 897.00 FT (273.41 M) WEST OF REFERENCE DISK C AT 13TH STREET
 HV9832'AND NORTH 89-52-29 WEST 1090.251 FT (332.309 M) FROM METRO CONTROL
 HV9832'STATION HAGGINS E808.
 HV9832
 HV9832                          STATION RECOVERY (2003)
 HV9832
 HV9832'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV9832'RECOVERED IN GOOD CONDITION.
 HV9832
 HV9832                          STATION RECOVERY (2014)
 HV9832
 HV9832'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2014 (BSU)
 HV9832'RECOVERED AS DESCRIBED IN GOOD CONDITION BY JMT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 UA0016 ***********************************************************************
 UA0016  DESIGNATION -  FREEDOM
 UA0016  PID         -  UA0016
 UA0016  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 UA0016  COUNTRY     -  US
 UA0016  USGS QUAD   -  WASHINGTON WEST (2016)
 UA0016
 UA0016                         *CURRENT SURVEY CONTROL
 UA0016  ______________________________________________________________________
 UA0016* NAD 83(2011) POSITION- 38 53 23.31608(N) 077 00 32.61474(W)   ADJUSTED
 UA0016* NAD 83(2011) ELLIP HT-    76.564 (meters)        (06/27/12)   ADJUSTED
 UA0016* NAD 83(2011) EPOCH   -  2010.00
 UA0016* NAVD 88 ORTHO HEIGHT -   108.7   (meters)      357.    (feet) GPS OBS
 UA0016  ______________________________________________________________________
 UA0016  NAVD 88 orthometric height was determined with geoid model    GEOID93
 UA0016  GEOID HEIGHT    -        -32.490 (meters)                     GEOID93
 UA0016  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 UA0016  NAD 83(2011) X  -  1,117,482.903 (meters)                     COMP
 UA0016  NAD 83(2011) Y  - -4,843,844.460 (meters)                     COMP
 UA0016  NAD 83(2011) Z  -  3,982,851.119 (meters)                     COMP
 UA0016  LAPLACE CORR    -         -3.29  (seconds)                    DEFLEC18
 UA0016
 UA0016  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 UA0016  Standards:
 UA0016         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 UA0016            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 UA0016  -------------------------------------------------------------------
 UA0016  NETWORK    0.97   3.53           0.44   0.34   1.80     -0.06851394
 UA0016  -------------------------------------------------------------------
 UA0016  Click here for local accuracies and other accuracy information.
 UA0016
 UA0016.The horizontal coordinates were established by GPS observations
 UA0016.and adjusted by the National Geodetic Survey in June 2012.
 UA0016
 UA0016.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 UA0016.been affixed to the stable North American tectonic plate. See 
 UA0016.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 UA0016
 UA0016.The horizontal coordinates are valid at the epoch date displayed above
 UA0016.which is a decimal equivalence of Year/Month/Day.
 UA0016
 UA0016.The orthometric height was determined by GPS observations and a
 UA0016.high-resolution geoid model.
 UA0016
 UA0016.Significant digits in the geoid height do not necessarily reflect accuracy.
 UA0016.GEOID18 height accuracy estimate available here.
 UA0016
 UA0016.Click photographs - Photos may exist for this station.
 UA0016
 UA0016.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 UA0016
 UA0016.The Laplace correction was computed from DEFLEC18 derived deflections.
 UA0016
 UA0016.The ellipsoidal height was determined by GPS observations
 UA0016.and is referenced to NAD 83.
 UA0016
 UA0016. The following values were computed from the NAD 83(2011) position.
 UA0016
 UA0016;                    North         East     Units Scale Factor Converg.
 UA0016;SPC MD       -   135,774.172   399,214.019   MT  0.99994988   -0 00 20.5
 UA0016;SPC MD       -   445,452.43  1,309,754.66   sFT  0.99994988   -0 00 20.5
 UA0016;SPC VA N     - 2,136,819.317 3,629,343.980   MT  0.99995965   +0 55 49.9
 UA0016;SPC VA N     - 7,010,548.04 11,907,272.71   sFT  0.99995965   +0 55 49.9
 UA0016;UTM  18      - 4,306,467.195   325,754.852   MT  0.99997387   -1 15 42.0
 UA0016
 UA0016!             -  Elev Factor  x  Scale Factor =   Combined Factor
 UA0016!SPC MD       -   0.99998799  x   0.99994988  =   0.99993787
 UA0016!SPC VA N     -   0.99998799  x   0.99995965  =   0.99994764
 UA0016!UTM  18      -   0.99998799  x   0.99997387  =   0.99996186
 UA0016
 UA0016_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2575406467(NAD 83)
 UA0016
 UA0016                          SUPERSEDED SURVEY CONTROL
 UA0016
 UA0016  NAD 83(2007)-  38 53 23.31632(N)    077 00 32.61548(W) AD(2002.00) 0
 UA0016  ELLIP H (02/10/07)   76.588  (m)                       GP(2002.00)    
 UA0016  ELLIP H (08/09/02)   76.554  (m)                       GP(       ) 4 2
 UA0016  NAD 83(1993)-  38 53 23.31643(N)    077 00 32.61537(W) AD(       ) B
 UA0016  ELLIP H (06/29/94)   76.546  (m)                       GP(       ) 4 1
 UA0016  NAD 83(1993)-  38 53 23.31644(N)    077 00 32.61536(W) AD(       ) B
 UA0016  ELLIP H (04/04/94)   76.546  (m)                       GP(       ) 4 1
 UA0016
 UA0016.Superseded values are not recommended for survey control.
 UA0016
 UA0016.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 UA0016.See file dsdata.pdf to determine how the superseded data were derived.
 UA0016
 UA0016_MARKER: Z = SEE DESCRIPTION
 UA0016_SETTING: 0 = UNSPECIFIED SETTING
 UA0016_MARK LOGO: NGS
 UA0016_MAGNETIC: N = NO MAGNETIC MATERIAL
 UA0016_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 UA0016_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 UA0016+SATELLITE: SATELLITE OBSERVATIONS - March 19, 2009
 UA0016
 UA0016  HISTORY     - Date     Condition        Report By
 UA0016  HISTORY     - 1993     MONUMENTED       NGS
 UA0016  HISTORY     - 20090319 GOOD             GEOCAC
 UA0016
 UA0016                          STATION DESCRIPTION
 UA0016
 UA0016'DESCRIBED BY NATIONAL GEODETIC SURVEY 1993
 UA0016'LOCATED ON THE DOME OF THE CAPITOL BUILDING.  A NON RECOVERABLE
 UA0016'STATION.
 UA0016
 UA0016                          STATION RECOVERY (2009)
 UA0016
 UA0016'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 UA0016'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1868 ***********************************************************************
 HV1868  DESIGNATION -  G 1 RESET 1948
 HV1868  PID         -  HV1868
 HV1868  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1868  COUNTRY     -  US
 HV1868  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1868
 HV1868                         *CURRENT SURVEY CONTROL
 HV1868  ______________________________________________________________________
 HV1868* NAD 83(1986) POSITION- 38 54 09.4    (N) 077 03 27.6    (W)   HD_HELD2
 HV1868* NAVD 88 ORTHO HEIGHT -     6.552 (meters)       21.50  (feet) ADJUSTED
 HV1868  ______________________________________________________________________
 HV1868  GEOID HEIGHT    -        -32.036 (meters)                     GEOID18
 HV1868  DYNAMIC HEIGHT  -          6.549 (meters)       21.49  (feet) COMP
 HV1868  MODELED GRAVITY -    980,093.8   (mgal)                       NAVD 88
 HV1868
 HV1868  VERT ORDER      -  FIRST     CLASS II
 HV1868
 HV1868.The horizontal coordinates were established by autonomous hand held GPS
 HV1868.observations and have an estimated accuracy of +/- 10 meters.
 HV1868
 HV1868.The orthometric height was determined by differential leveling and
 HV1868.adjusted by the NATIONAL GEODETIC SURVEY
 HV1868.in June 1991.
 HV1868
 HV1868.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1868.GEOID18 height accuracy estimate available here.
 HV1868
 HV1868.Click photographs - Photos may exist for this station.
 HV1868
 HV1868.The dynamic height is computed by dividing the NAVD 88
 HV1868.geopotential number by the normal gravity value computed on the
 HV1868.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1868.degrees latitude (g = 980.6199 gals.).
 HV1868
 HV1868.The modeled gravity was interpolated from observed gravity values.
 HV1868
 HV1868
 HV1868_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2157007981(NAD 83)
 HV1868
 HV1868                          SUPERSEDED SURVEY CONTROL
 HV1868
 HV1868  NGVD 29 (??/??/??)    6.79   (m)           22.3    (f) RESET       3  
 HV1868
 HV1868.Superseded values are not recommended for survey control.
 HV1868
 HV1868.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1868.See file dsdata.pdf to determine how the superseded data were derived.
 HV1868
 HV1868_MARKER: DB = BENCH MARK DISK
 HV1868_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1868_SP_SET: CURB
 HV1868_STAMPING: G 1 RESET 1948
 HV1868_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1868_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1868+SATELLITE: SATELLITE OBSERVATIONS - August 30, 2005
 HV1868
 HV1868  HISTORY     - Date     Condition        Report By
 HV1868  HISTORY     - 1948     MONUMENTED       CGS
 HV1868  HISTORY     - 1956     GOOD             USGS
 HV1868  HISTORY     - 1979     GOOD             NGS
 HV1868  HISTORY     - 20050830 GOOD             GEOCAC
 HV1868
 HV1868                          STATION DESCRIPTION
 HV1868
 HV1868'DESCRIBED BY COAST AND GEODETIC SURVEY 1948
 HV1868'AT WASHINGTON.
 HV1868'AT WASHINGTON, AT THE EAST END OF THE WHITEHURST FREEWAY (THE NEW
 HV1868'K STREET ELEVATED ROADWAY), NEAR THE INTERSECTION OF TWENTY-NINTH
 HV1868'AND K STREETS NORTHWEST, ON THE LOWER LEVEL OF THE BRIDGE OVER
 HV1868'THE ROCK CREEK AND POTOMAC PARK PARKWAY, ON THE NORTH ROADWAY
 HV1868'LEADING FROM THE PARKWAY TO K STREET, OPPOSITE THE LARGE MAIN
 HV1868'COLUMN ON THE EAST BANK OF ROCK CREEK, 120.4 FEET EAST OF THE WEST
 HV1868'END OF THE WALL SEPARATING K STREET AND THE ROADWAY, AT THE FOOT
 HV1868'OF THE THIRD CONCRETE COLUMN FROM THE WEST END, AND ON THE SOUTH
 HV1868'CURB.  A STANDARD DISK, STAMPED G 1 RESET 1948.  NOTE-- TIDAL STA.
 HV1868'THIS MARK PREVIOUSLY DESIGNATED G 1 RESET 1948 = RCPP 4 (PBPP ) =
 HV1868'TIDAL MARK.
 HV1868
 HV1868                          STATION RECOVERY (1956)
 HV1868
 HV1868'RECOVERY NOTE BY US GEOLOGICAL SURVEY 1956
 HV1868'RECOVERED IN GOOD CONDITION.
 HV1868
 HV1868                          STATION RECOVERY (1979)
 HV1868
 HV1868'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1868'RECOVERED IN GOOD CONDITION.
 HV1868
 HV1868                          STATION RECOVERY (2005)
 HV1868
 HV1868'RECOVERY NOTE BY GEOCACHING 2005 (RBW)
 HV1868'ON THE RAMP/BRIDGE FROM THE PARKWAY SOUTHBOUND TO K STREET WESTBOUND,
 HV1868'ON THE CURB OF THE LEFT SIDE OF THE ROAD.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1399 ***********************************************************************
 HV1399  TIDAL BM    -  This is a Tidal Bench Mark.
 HV1399  DESIGNATION -  G 2
 HV1399  PID         -  HV1399
 HV1399  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1399  COUNTRY     -  US
 HV1399  USGS QUAD   -  ANACOSTIA (2016)
 HV1399
 HV1399                         *CURRENT SURVEY CONTROL
 HV1399  ______________________________________________________________________
 HV1399* NAD 83(1986) POSITION- 38 52 22.     (N) 076 59 44.     (W)   SCALED
 HV1399* NAVD 88 ORTHO HEIGHT -     2.677 (meters)        8.78  (feet) ADJUSTED
 HV1399  ______________________________________________________________________
 HV1399  GEOID HEIGHT    -        -32.183 (meters)                     GEOID18
 HV1399  DYNAMIC HEIGHT  -          2.675 (meters)        8.78  (feet) COMP
 HV1399  MODELED GRAVITY -    980,095.9   (mgal)                       NAVD 88
 HV1399
 HV1399  VERT ORDER      -  FIRST     CLASS II
 HV1399
 HV1399.The horizontal coordinates were scaled from a map and have
 HV1399.an estimated accuracy of +/- 6 seconds.
 HV1399
 HV1399.The orthometric height was determined by differential leveling and
 HV1399.adjusted by the NATIONAL GEODETIC SURVEY
 HV1399.in June 1991.
 HV1399
 HV1399.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1399.GEOID18 height accuracy estimate available here.
 HV1399
 HV1399.This Tidal Bench Mark is designated as VM 12744
 HV1399.by the CENTER FOR OPERATIONAL OCEANOGRAPHIC PRODUCTS AND SERVICES.
 HV1399
 HV1399.Click photographs - Photos may exist for this station.
 HV1399
 HV1399.The dynamic height is computed by dividing the NAVD 88
 HV1399.geopotential number by the normal gravity value computed on the
 HV1399.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1399.degrees latitude (g = 980.6199 gals.).
 HV1399
 HV1399.The modeled gravity was interpolated from observed gravity values.
 HV1399
 HV1399
 HV1399_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ268045(NAD 83)
 HV1399
 HV1399                          SUPERSEDED SURVEY CONTROL
 HV1399
 HV1399  NGVD 29 (11/26/84)    2.918  (m)            9.57   (f) ADJUSTED    1 2
 HV1399
 HV1399.Superseded values are not recommended for survey control.
 HV1399
 HV1399.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1399.See file dsdata.pdf to determine how the superseded data were derived.
 HV1399
 HV1399_MARKER: B = BOLT
 HV1399_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1399_SP_SET: GRANITE FOUNDATION
 HV1399_STAMPING: G 2
 HV1399_MARK LOGO: NONE
 HV1399_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1399_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1399_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1399+SATELLITE: SATELLITE OBSERVATIONS - March 15, 2012
 HV1399
 HV1399  HISTORY     - Date     Condition        Report By
 HV1399  HISTORY     - UNK      MONUMENTED       CGS
 HV1399  HISTORY     - 1923     GOOD             CGS
 HV1399  HISTORY     - 1955     GOOD             CGS
 HV1399  HISTORY     - 20010724 GOOD             NGS
 HV1399  HISTORY     - 20120315 GOOD             GEOCAC
 HV1399
 HV1399                          STATION DESCRIPTION
 HV1399
 HV1399'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1399'IN WASHINGTON.
 HV1399'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1399'ON PAULDING STREET, AT THE SOUTHWEST CORNER OF BUILDING 76,
 HV1399'0.4 FOOT WEST OF THE CORNER, AND IN THE SOUTH SIDE OF THE
 HV1399'GRANITE FOUNDATION.  THE HIGHEST POINT OF A BARREL-SHAPED KNOB
 HV1399'ON THE PROJECTING END OF A BRASS BOLT, THE EXPOSED END OF WHICH
 HV1399'IS STAMPED G 2.
 HV1399
 HV1399                          STATION RECOVERY (1955)
 HV1399
 HV1399'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1399'RECOVERED IN GOOD CONDITION.
 HV1399
 HV1399                          STATION RECOVERY (2001)
 HV1399
 HV1399'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 HV1399'RECOVERED AS DESCRIBED.
 HV1399
 HV1399                          STATION RECOVERY (2012)
 HV1399
 HV1399'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV1399'THIS BENCHMARK IS INSIDE THE FRONT DOORWAY ADDITION TO THE NAVY MUSEUM
 HV1399'
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1466 ***********************************************************************
 HV1466  DESIGNATION -  G 4 DCDHT
 HV1466  PID         -  HV1466
 HV1466  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1466  COUNTRY     -  US
 HV1466  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1466
 HV1466                         *CURRENT SURVEY CONTROL
 HV1466  ______________________________________________________________________
 HV1466* NAD 83(1986) POSITION- 38 52 51.     (N) 076 57 53.     (W)   SCALED
 HV1466* NAVD 88 ORTHO HEIGHT -    16.246 (meters)       53.30  (feet) ADJUSTED
 HV1466  ______________________________________________________________________
 HV1466  GEOID HEIGHT    -        -32.225 (meters)                     GEOID18
 HV1466  DYNAMIC HEIGHT  -         16.237 (meters)       53.27  (feet) COMP
 HV1466  MODELED GRAVITY -    980,091.8   (mgal)                       NAVD 88
 HV1466
 HV1466  VERT ORDER      -  SECOND    CLASS 0
 HV1466
 HV1466.The horizontal coordinates were scaled from a map and have
 HV1466.an estimated accuracy of +/- 6 seconds.
 HV1466
 HV1466.The orthometric height was determined by differential leveling and
 HV1466.adjusted by the NATIONAL GEODETIC SURVEY
 HV1466.in June 1991.
 HV1466
 HV1466.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1466.GEOID18 height accuracy estimate available here.
 HV1466
 HV1466.Click photographs - Photos may exist for this station.
 HV1466
 HV1466.The dynamic height is computed by dividing the NAVD 88
 HV1466.geopotential number by the normal gravity value computed on the
 HV1466.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1466.degrees latitude (g = 980.6199 gals.).
 HV1466
 HV1466.The modeled gravity was interpolated from observed gravity values.
 HV1466
 HV1466
 HV1466_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ295053(NAD 83)
 HV1466
 HV1466                          SUPERSEDED SURVEY CONTROL
 HV1466
 HV1466  NGVD 29 (11/26/84)   16.484  (m)           54.08   (f) ADJUSTED    2 0
 HV1466
 HV1466.Superseded values are not recommended for survey control.
 HV1466
 HV1466.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1466.See file dsdata.pdf to determine how the superseded data were derived.
 HV1466
 HV1466_MARKER: DD = SURVEY DISK
 HV1466_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1466_SP_SET: WALK
 HV1466_STAMPING: G 4 1961
 HV1466_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1466
 HV1466  HISTORY     - Date     Condition        Report By
 HV1466  HISTORY     - 1961     MONUMENTED       DCDHT
 HV1466
 HV1466                          STATION DESCRIPTION
 HV1466
 HV1466'DESCRIBED BY DC DEPARTMENT OF HIGHWAYS AND TRAFFIC 1961
 HV1466'IN WASHINGTON.
 HV1466'IN SE WASHINGTON, D.C., IN ANACOSTIA PARK, AT THE W CORNER OF
 HV1466'BRIDGE 505 CARRYING THE ANACOSTIA FREEWAY OVER THE P.R.R. FREIGHT
 HV1466'YARDS, NEAR THE NW END OF THE SE ABUTMENT, 1 FOOT NW OF THE CURB,
 HV1466'1 FOOT NE OF THE NE FACE OF THE ABUTMENT, AND IN THE WALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV0874 ***********************************************************************
 HV0874  DESIGNATION -  G 5
 HV0874  PID         -  HV0874
 HV0874  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV0874  COUNTRY     -  US
 HV0874  USGS QUAD   -  ANACOSTIA (2016)
 HV0874
 HV0874                         *CURRENT SURVEY CONTROL
 HV0874  ______________________________________________________________________
 HV0874* NAD 83(1986) POSITION- 38 52 23.0    (N) 076 58 08.0    (W)   HD_HELD2
 HV0874* NAVD 88 ORTHO HEIGHT -    15.941 (meters)       52.30  (feet) ADJUSTED
 HV0874  ______________________________________________________________________
 HV0874  GEOID HEIGHT    -        -32.227 (meters)                     GEOID18
 HV0874  DYNAMIC HEIGHT  -         15.932 (meters)       52.27  (feet) COMP
 HV0874  MODELED GRAVITY -    980,090.6   (mgal)                       NAVD 88
 HV0874
 HV0874  VERT ORDER      -  FIRST     CLASS II
 HV0874
 HV0874.The horizontal coordinates were established by autonomous hand held GPS
 HV0874.observations and have an estimated accuracy of +/- 10 meters.
 HV0874
 HV0874.The orthometric height was determined by differential leveling and
 HV0874.adjusted by the NATIONAL GEODETIC SURVEY
 HV0874.in August 2020.
 HV0874
 HV0874.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV0874.GEOID18 height accuracy estimate available here.
 HV0874
 HV0874.Click photographs - Photos may exist for this station.
 HV0874
 HV0874.The dynamic height is computed by dividing the NAVD 88
 HV0874.geopotential number by the normal gravity value computed on the
 HV0874.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV0874.degrees latitude (g = 980.6199 gals.).
 HV0874
 HV0874.The modeled gravity was interpolated from observed gravity values.
 HV0874
 HV0874
 HV0874_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2919904531(NAD 83)
 HV0874
 HV0874                          SUPERSEDED SURVEY CONTROL
 HV0874
 HV0874  NAVD 88 (06/15/91)   15.924  (m)           52.24   (f) SUPERSEDED  1 1
 HV0874  NGVD 29 (11/26/84)   16.161  (m)           53.02   (f) ADJUSTED    1 1
 HV0874
 HV0874.Superseded values are not recommended for survey control.
 HV0874
 HV0874.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV0874.See file dsdata.pdf to determine how the superseded data were derived.
 HV0874
 HV0874_MARKER: DB = BENCH MARK DISK
 HV0874_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV0874_SP_SET: BUILDING
 HV0874_STAMPING: G 5 1971
 HV0874_MARK LOGO: CGS
 HV0874_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV0874_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV0874+SATELLITE: SATELLITE OBSERVATIONS - October 28, 2019
 HV0874
 HV0874  HISTORY     - Date     Condition        Report By
 HV0874  HISTORY     - 1971     MONUMENTED       NGS
 HV0874  HISTORY     - 20030621 GOOD             GEOCAC
 HV0874  HISTORY     - 20110924 GOOD             NGS
 HV0874  HISTORY     - 20191028 GOOD             ARCSHE
 HV0874
 HV0874                          STATION DESCRIPTION
 HV0874
 HV0874'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV0874'AT WASHINGTON.
 HV0874'AT WASHINGTON, D.C., ABOUT 0.45 MILE SOUTHEAST ALONG PENNSYLVANIA
 HV0874'AVENUE FROM THE SOUTHEAST END OF THE JOHN PHILIP SOUSA BRIDGE
 HV0874'OVER THE ANACOSTIA RIVER, AT THE NORTHEAST ANGLE OF THE JUNCTION
 HV0874'OF SE 27TH AND SE O STREETS, SET VERTICALLY IN THE SOUTH BRICK
 HV0874'FACE AND 3.6 FEET EAST OF THE SOUTHWEST CORNER OF THE ST. FRANCIS
 HV0874'XAVIER SCHOOL BUILDING (2700 0 STREET SE), 29.9 FEET NORTH OF THE
 HV0874'NORTH CURB OF SE O STREET, 77.0 FEET NORTH AND ACROSS SE 0 STREET
 HV0874'FROM THE NORTHEAST CURB OF THE NORTHEAST LANES OF PENNSYLVANIA
 HV0874'AVENUE, 18.6 FEET EAST OF THE EAST CURB OF SE 27TH STREET, AND
 HV0874'ABOUT 2 1/2 FEET ABOVE THE LEVEL OF THE SIDEWALK.
 HV0874
 HV0874                          STATION RECOVERY (2003)
 HV0874
 HV0874'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV0874'STATION IS ADJACENT TO CORNERSTONE, WHICH IS INSCRIBED AD 1939.
 HV0874
 HV0874                          STATION RECOVERY (2011)
 HV0874
 HV0874'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2011 (DRD)
 HV0874'RECOVERED IN GOOD CONDITION.
 HV0874
 HV0874                          STATION RECOVERY (2019)
 HV0874
 HV0874'RECOVERY NOTE BY ARCHER-SHEE LAND SURVEYING 2019 (MRA)
 HV0874'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7708 ***********************************************************************
 HV7708  DESIGNATION -  G USE 1931
 HV7708  PID         -  HV7708
 HV7708  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7708  COUNTRY     -  US
 HV7708  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7708
 HV7708                         *CURRENT SURVEY CONTROL
 HV7708  ______________________________________________________________________
 HV7708* NAD 83(1993) POSITION- 38 54 32.24458(N) 076 57 25.03621(W)   ADJUSTED
 HV7708* NAVD 88 ORTHO HEIGHT -     2.47  (+/-2cm)        8.1   (feet) VERTCON3
 HV7708  ______________________________________________________________________
 HV7708  GEOID HEIGHT    -        -32.197 (meters)                     GEOID18
 HV7708  LAPLACE CORR    -         -4.33  (seconds)                    DEFLEC18
 HV7708  HORZ ORDER      -  THIRD
 HV7708  VERT ORDER      -  THIRD ? (See Below)
 HV7708
 HV7708.The horizontal coordinates were established by classical geodetic methods
 HV7708.and adjusted by the National Geodetic Survey in November 1994.
 HV7708
 HV7708.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV7708.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV7708
 HV7708.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7708.GEOID18 height accuracy estimate available here.
 HV7708
 HV7708.The vertical order pertains to the NGVD 29 superseded value.
 HV7708
 HV7708.Click photographs - Photos may exist for this station.
 HV7708
 HV7708.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7708
 HV7708. The following values were computed from the NAD 83(1993) position.
 HV7708
 HV7708;                    North         East     Units Scale Factor Converg.
 HV7708;SPC MD       -   137,900.462   403,733.464   MT  0.99995001   +0 01 37.3
 HV7708;SPC MD       -   452,428.43  1,324,582.21   sFT  0.99995001   +0 01 37.3
 HV7708;SPC VA N     - 2,139,019.183 3,633,828.131   MT  0.99996129   +0 57 47.0
 HV7708;SPC VA N     - 7,017,765.44 11,921,984.46   sFT  0.99996129   +0 57 47.0
 HV7708;UTM  18      - 4,308,493.922   330,319.891   MT  0.99995454   -1 13 45.9
 HV7708
 HV7708!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7708!SPC MD       -   1.00000466  x   0.99995001  =   0.99995467
 HV7708!SPC VA N     -   1.00000466  x   0.99996129  =   0.99996595
 HV7708!UTM  18      -   1.00000466  x   0.99995454  =   0.99995920
 HV7708
 HV7708:                Primary Azimuth Mark                     Grid Az
 HV7708:SPC MD       -  H USE 1931                               033 07 17.1
 HV7708:SPC VA N     -  H USE 1931                               032 11 07.4
 HV7708:UTM  18      -  H USE 1931                               034 22 40.3
 HV7708
 HV7708_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3031908493(NAD 83)
 HV7708
 HV7708|---------------------------------------------------------------------|
 HV7708| PID    Reference Object                     Distance      Geod. Az  |
 HV7708|                                                           dddmmss.s |
 HV7708| HV7667 H USE 1931                          APPROX. 1.1 KM 0330854.4 |
 HV7708|---------------------------------------------------------------------|
 HV7708
 HV7708                          SUPERSEDED SURVEY CONTROL
 HV7708
 HV7708  NAD 83(1991)-  38 54 32.24334(N)    076 57 25.03730(W) AD(       ) 3
 HV7708  NAD 83(1986)-  38 54 32.24244(N)    076 57 25.04831(W) AD(       ) 3
 HV7708  NAD 27      -  38 54 31.83500(N)    076 57 26.14800(W) AD(       ) 3
 HV7708  NGVD 29               2.71   (m)            8.9    (f) LEVELING    3  
 HV7708
 HV7708.Superseded values are not recommended for survey control.
 HV7708
 HV7708.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7708.See file dsdata.pdf to determine how the superseded data were derived.
 HV7708
 HV7708
 HV7708  HISTORY     - Date     Condition        Report By
 HV7708  HISTORY     - 1931     MONUMENTED       CGS
 HV7708  HISTORY     - 1958     MARK NOT FOUND   CGS
 HV7708
 HV7708                          STATION DESCRIPTION
 HV7708
 HV7708'DESCRIBED BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7708'DUE TO THE LACK OF A DESCRIPTION, THE STATION IS NOT RECOVERABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1873 ***********************************************************************
 HV1873  DESIGNATION -  GAGING STA RM 1=TIDAL
 HV1873  PID         -  HV1873
 HV1873  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1873  COUNTRY     -  US
 HV1873  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1873
 HV1873                         *CURRENT SURVEY CONTROL
 HV1873  ______________________________________________________________________
 HV1873* NAD 83(1986) POSITION- 38 54 07.     (N) 077 03 42.     (W)   SCALED
 HV1873* NAVD 88 ORTHO HEIGHT -     4.306 (meters)       14.13  (feet) ADJUSTED
 HV1873  ______________________________________________________________________
 HV1873  GEOID HEIGHT    -        -32.032 (meters)                     GEOID18
 HV1873  DYNAMIC HEIGHT  -          4.304 (meters)       14.12  (feet) COMP
 HV1873  MODELED GRAVITY -    980,093.2   (mgal)                       NAVD 88
 HV1873
 HV1873  VERT ORDER      -  SECOND    CLASS 0
 HV1873
 HV1873.The horizontal coordinates were scaled from a map and have
 HV1873.an estimated accuracy of +/- 6 seconds.
 HV1873
 HV1873.The orthometric height was determined by differential leveling and
 HV1873.adjusted by the NATIONAL GEODETIC SURVEY
 HV1873.in June 1991.
 HV1873
 HV1873.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1873.GEOID18 height accuracy estimate available here.
 HV1873
 HV1873.Click photographs - Photos may exist for this station.
 HV1873
 HV1873.The dynamic height is computed by dividing the NAVD 88
 HV1873.geopotential number by the normal gravity value computed on the
 HV1873.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1873.degrees latitude (g = 980.6199 gals.).
 HV1873
 HV1873.The modeled gravity was interpolated from observed gravity values.
 HV1873
 HV1873
 HV1873_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ212079(NAD 83)
 HV1873
 HV1873                          SUPERSEDED SURVEY CONTROL
 HV1873
 HV1873  NGVD 29 (11/26/84)    4.538  (m)           14.89   (f) ADJUSTED    2 0
 HV1873
 HV1873.Superseded values are not recommended for survey control.
 HV1873
 HV1873.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1873.See file dsdata.pdf to determine how the superseded data were derived.
 HV1873
 HV1873_MARKER: DR = REFERENCE MARK DISK
 HV1873_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
 HV1873_SP_SET: WALL
 HV1873_MARK LOGO: USGS
 HV1873_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1873+STABILITY: SURFACE MOTION
 HV1873
 HV1873  HISTORY     - Date     Condition        Report By
 HV1873  HISTORY     - UNK      MONUMENTED       USGS
 HV1873  HISTORY     - 1941     GOOD             CGS
 HV1873  HISTORY     - 1960     GOOD             CGS
 HV1873
 HV1873                          STATION DESCRIPTION
 HV1873
 HV1873'DESCRIBED BY COAST AND GEODETIC SURVEY 1941
 HV1873'AT GEORGETOWN.
 HV1873'AT GEORGETOWN, WASHINGTON, D.C., AT THE FOOT OF WISCONSIN AVENUE
 HV1873'NORTHWEST, BELOW K STREET, NEAR THE U.S. GEOLOGICAL SURVEY GAGE
 HV1873'HOUSE, 20 FEET DOWNSTREAM AND 25 FEET STREAMWARD FROM THE CONCRETE
 HV1873'BUILDING, IN THE TOP OF THE CONCRETE WALL AROUND THE GATE PIT
 HV1873'NEAREST TO THE DOCK LINE, AND UNDER PLANKING.  A UNITED STATES
 HV1873'GEOLOGICAL SURVEY STANDARD GAGING-STATION REFERENCE-MARK DISK.
 HV1873
 HV1873                          STATION RECOVERY (1960)
 HV1873
 HV1873'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1873'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1825 ***********************************************************************
 HV1825  DESIGNATION -  GALENA
 HV1825  PID         -  HV1825
 HV1825  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1825  COUNTRY     -  US
 HV1825  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1825
 HV1825                         *CURRENT SURVEY CONTROL
 HV1825  ______________________________________________________________________
 HV1825* NAD 83(1993) POSITION- 38 55 37.56142(N) 077 06 31.40375(W)   ADJUSTED
 HV1825* NAVD 88 ORTHO HEIGHT -    41.40  (+/-2cm)      135.8   (feet) VERTCON3
 HV1825  ______________________________________________________________________
 HV1825  GEOID HEIGHT    -        -31.930 (meters)                     GEOID18
 HV1825  LAPLACE CORR    -         -2.04  (seconds)                    DEFLEC18
 HV1825  HORZ ORDER      -  SECOND
 HV1825  VERT ORDER      -  ? (See Below)
 HV1825
 HV1825.The horizontal coordinates were established by classical geodetic methods
 HV1825.and adjusted by the National Geodetic Survey in November 1994.
 HV1825
 HV1825.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1825.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1825
 HV1825.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1825.GEOID18 height accuracy estimate available here.
 HV1825
 HV1825.The vertical order pertains to the NGVD 29 superseded value.
 HV1825
 HV1825.Click photographs - Photos may exist for this station.
 HV1825
 HV1825.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1825
 HV1825. The following values were computed from the NAD 83(1993) position.
 HV1825
 HV1825;                    North         East     Units Scale Factor Converg.
 HV1825;SPC MD       -   139,919.284   390,572.509   MT  0.99995025   -0 04 05.7
 HV1825;SPC MD       -   459,051.85  1,281,403.31   sFT  0.99995025   -0 04 05.7
 HV1825;SPC VA N     - 2,140,822.698 3,620,635.786   MT  0.99996295   +0 52 06.0
 HV1825;SPC VA N     - 7,023,682.47 11,878,702.57   sFT  0.99996295   +0 52 06.0
 HV1825;UTM  18      - 4,310,800.992   317,205.955   MT  1.00001146   -1 19 31.2
 HV1825
 HV1825!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1825!SPC MD       -   0.99999851  x   0.99995025  =   0.99994876
 HV1825!SPC VA N     -   0.99999851  x   0.99996295  =   0.99996146
 HV1825!UTM  18      -   0.99999851  x   1.00001146  =   1.00000997
 HV1825
 HV1825:                Primary Azimuth Mark                     Grid Az
 HV1825:SPC MD       -  GARAGE USE 1925                          143 38 01.9
 HV1825:SPC VA N     -  GARAGE USE 1925                          142 41 50.2
 HV1825:UTM  18      -  GARAGE USE 1925                          144 53 27.4
 HV1825
 HV1825_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1720510800(NAD 83)
 HV1825
 HV1825|---------------------------------------------------------------------|
 HV1825| PID    Reference Object                     Distance      Geod. Az  |
 HV1825|                                                           dddmmss.s |
 HV1825| HV3997 GARAGE USE 1925                     APPROX. 1.5 KM 1433356.2 |
 HV1825| DE5038 GALENA WM 1                                        15315     |
 HV1825| HV0556 DRILL                               458.135 METERS 2054210.5 |
 HV1825| DE5036 GALENA RM 1                                        23511     |
 HV1825| HV0366 CREEK                               437.631 METERS 2371810.4 |
 HV1825| HV4100 BLUFF                               261.865 METERS 32848     |
 HV1825| DE5037 GALENA RM 2                                        33639     |
 HV1825|---------------------------------------------------------------------|
 HV1825
 HV1825                          SUPERSEDED SURVEY CONTROL
 HV1825
 HV1825  NAD 83(1991)-  38 55 37.56034(N)    077 06 31.40540(W) AD(       ) 2
 HV1825  NAD 83(1986)-  38 55 37.56013(N)    077 06 31.41541(W) AD(       ) 2
 HV1825  NAD 27      -  38 55 37.16000(N)    077 06 32.48700(W) AD(       ) 2
 HV1825  NGVD 29              41.62   (m)          136.5    (f) LEVELING    3  
 HV1825  NGVD 29 (11/26/84)   41.620  (m)          136.55   (f) ADJUSTED       
 HV1825
 HV1825.Superseded values are not recommended for survey control.
 HV1825
 HV1825.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1825.See file dsdata.pdf to determine how the superseded data were derived.
 HV1825
 HV1825_MARKER: DD = SURVEY DISK
 HV1825_SETTING: 17 = SET INTO TOP OF METAL PIPE DRIVEN INTO GROUND
 HV1825_MARK LOGO: USACE
 HV1825_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1825
 HV1825  HISTORY     - Date     Condition        Report By
 HV1825  HISTORY     - 1925     MONUMENTED       USACE
 HV1825  HISTORY     - 1925     GOOD             CGS
 HV1825  HISTORY     - 1947     GOOD             CGS
 HV1825  HISTORY     - 1947     GOOD             CGS
 HV1825
 HV1825                          STATION DESCRIPTION
 HV1825
 HV1825'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1925 (GLB)
 HV1825'STATION IS SITUATED ON THE W END OF GALENA PLACE AT STREET
 HV1825'INTERSECTION AT TOP OF BLUFF OVERLOOKING RIVER.  BOTH CHAIN BRIDGE
 HV1825'AND THE RAILROAD BRIDGE ARE VISIBLE.
 HV1825'
 HV1825'STATION MARKED BY A U.S. ENGINEERS MARK IS SET IN A 12-INCH TILE
 HV1825'FILLED WITH CONCRETE AND SET BIG END DOWN, PROJECTING ABOUT
 HV1825'3 INCHES ABOVE SURFACE OF GROUND.
 HV1825'
 HV1825'REFERENCE MARK NO. 1 IS THE CENTER OF THE TOP NUT IN A FIRE HYDRANT.
 HV1825'
 HV1825'REFERENCE MARK NO. 2 IS THE CENTER OF THE CROSS CUT IN THE TOP OF
 HV1825'A STONE PROPERTY MONUMENT ON THE NE CORNER OF THE STREET
 HV1825'INTERSECTION.
 HV1825'
 HV1825'WITNESS MARK NO. 1 IS THE NORTHERNMOST OF TWO TREES ABOUT 6 INCHES
 HV1825'IN DIAMETER ABOUT 12 FEET APART AND ON THE SE CORNER OF THE
 HV1825'STREET INTERSECTION.
 HV1825
 HV1825                          STATION RECOVERY (1925)
 HV1825
 HV1825'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1925
 HV1825'AT WASHINGTON.
 HV1825'AT WASHINGTON, AT THE JUNCTION OF GALENA PLACE AND POTOMAC AVENUE
 HV1825'NORTHWEST, 53.2 FEET EAST OF THE CENTERLINE OF POTOMAC AVENUE,
 HV1825'28.6 FEET NORTH OF THE CENTERLINE OF GALENA PLACE, 20.7 FEET
 HV1825'NORTHEAST OF A FIRE HYDRANT (R.M. 1), AND 16.6 FEET SOUTHEAST
 HV1825'OF A STONE PROPERTY MONUMENT (R.M. 2) AT THE NORTHEAST CORNER OF
 HV1825'THE INTERSECTION.  A CORPS OF ENGINEERS, U.S. ARMY, STANDARD
 HV1825'DISK, SET IN THE TOP OF A CONCRETE-FILLED 12-INCH TILE PIPE.
 HV1825
 HV1825                          STATION RECOVERY (1947)
 HV1825
 HV1825'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947 (RMB)
 HV1825'STATION WAS RECOVERED.  R.M. 2 WAS SEARCHED FOR AND NOT FOUND.
 HV1825'WITNESS MARK HAS BEEN REMOVED.  THE DISTANCE TO REFERENCE MARK 1
 HV1825'WAS CHECKED AND FOUND TO BE 20.7 FEET (6.31 METERS).  THE STATION
 HV1825'IS AT THE TOE OF A 3-FOOT TERRACE UNDER A CLUSTER OF ROSE BUSHES.
 HV1825
 HV1825                          STATION RECOVERY (1947)
 HV1825
 HV1825'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947
 HV1825'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV3997 ***********************************************************************
 HV3997  DESIGNATION -  GARAGE USE 1925
 HV3997  PID         -  HV3997
 HV3997  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV3997  COUNTRY     -  US
 HV3997  USGS QUAD   -  WASHINGTON WEST (2016)
 HV3997
 HV3997                         *CURRENT SURVEY CONTROL
 HV3997  ______________________________________________________________________
 HV3997* NAD 83(1993) POSITION- 38 54 58.82636(N) 077 05 54.80455(W)   ADJUSTED
 HV3997* NAVD 88 ORTHO HEIGHT -    37.    (meters)      121.    (feet) SCALED
 HV3997  ______________________________________________________________________
 HV3997  GEOID HEIGHT    -        -31.957 (meters)                     GEOID18
 HV3997  LAPLACE CORR    -         -2.34  (seconds)                    DEFLEC18
 HV3997  HORZ ORDER      -  SECOND
 HV3997
 HV3997.The horizontal coordinates were established by classical geodetic methods
 HV3997.and adjusted by the National Geodetic Survey in November 1994.
 HV3997
 HV3997.The orthometric height was scaled from a topographic map.
 HV3997
 HV3997.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV3997.GEOID18 height accuracy estimate available here.
 HV3997
 HV3997.Click photographs - Photos may exist for this station.
 HV3997
 HV3997.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV3997
 HV3997. The following values were computed from the NAD 83(1993) position.
 HV3997
 HV3997;                    North         East     Units Scale Factor Converg.
 HV3997;SPC MD       -   138,723.862   391,452.761   MT  0.99995010   -0 03 42.7
 HV3997;SPC MD       -   455,129.87  1,284,291.27   sFT  0.99995010   -0 03 42.7
 HV3997;SPC VA N     - 2,139,641.809 3,621,535.471   MT  0.99996195   +0 52 28.8
 HV3997;SPC VA N     - 7,019,808.17 11,881,654.29   sFT  0.99996195   +0 52 28.8
 HV3997;UTM  18      - 4,309,586.476   318,059.822   MT  1.00000763   -1 19 07.1
 HV3997
 HV3997!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV3997!SPC MD       -   0.99999924  x   0.99995010  =   0.99994934
 HV3997!SPC VA N     -   0.99999924  x   0.99996195  =   0.99996119
 HV3997!UTM  18      -   0.99999924  x   1.00000763  =   1.00000687
 HV3997
 HV3997_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1805909586(NAD 83)
 HV3997
 HV3997                          SUPERSEDED SURVEY CONTROL
 HV3997
 HV3997  NAD 83(1991)-  38 54 58.82519(N)    077 05 54.80618(W) AD(       ) 2
 HV3997  NAD 83(1986)-  38 54 58.82507(N)    077 05 54.81601(W) AD(       ) 2
 HV3997  NAD 27      -  38 54 58.42300(N)    077 05 55.88700(W) AD(       ) 2
 HV3997
 HV3997.Superseded values are not recommended for survey control.
 HV3997
 HV3997.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV3997.See file dsdata.pdf to determine how the superseded data were derived.
 HV3997
 HV3997_MARKER: DD = SURVEY DISK
 HV3997_SETTING: 0 = UNSPECIFIED SETTING
 HV3997_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV3997
 HV3997  HISTORY     - Date     Condition        Report By
 HV3997  HISTORY     - 1925     MONUMENTED       USACE
 HV3997  HISTORY     - 1940     MARK NOT FOUND   CGS
 HV3997  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV3997
 HV3997                          STATION DESCRIPTION
 HV3997
 HV3997'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1925 (GLB)
 HV3997'STATION IS SITUATED ON THE TOP OF A FLAT ROOFED GARAGE AT THE
 HV3997'RESIDENCE OF MR. BENTON, CALLED WHITHAVEN, ON NEW CUT ROAD.
 HV3997'A U.S. ENGINEERS MARK IS SET IN AN IRREGULAR MASS OF CONCRETE AND
 HV3997'RAISED ABOUT 4 INCHES ABOVE THE LEVEL OF THE ROOF.  THE GARAGE
 HV3997'IS SQUARE, PAINTED GREEN AND HAS A FLAT CONCRETE ROOF WITH A
 HV3997'GUARD RAIL AROUND IT.
 HV3997'
 HV3997'WITNESS MARK NO. 1 IS THE W EDGE OF THE ROOF DISTANT 9.7 FEET.
 HV3997'
 HV3997'WITNESS MARK NO. 2 IS THE N EDGE OF THE ROOF DISTANT 3.1 FEET.
 HV3997'
 HV3997'HEIGHT OF TELESCOPE ABOVE STATION MARK - 4.05 FEET.
 HV3997
 HV3997                          STATION RECOVERY (1940)
 HV3997
 HV3997'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV3997'STATION LOST.  OWNER SAYS MARK DESTROYED SEVERAL YEARS AGO WHEN
 HV3997'NEW ROOF WAS PUT ON, BUT THAT A PARTY OF SURVEYORS CAME THERE AT
 HV3997'THE TIME AND REFERENCED IT IN.  SHE DID NOT KNOW WHO THEY WERE,
 HV3997'BUT IT IS LIKELY THEY WERE WITH THE U.S.E.D.
 HV3997
 HV3997                          STATION RECOVERY (1971)
 HV3997
 HV3997'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV3997'STATION WAS LOST WHEN THE GARAGE ON WHICH IT WAS LOCATED WAS
 HV3997'REROOFED.
 HV3997'
 HV3997'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7551 ***********************************************************************
 HV7551  DESIGNATION -  GARFIELD
 HV7551  PID         -  HV7551
 HV7551  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7551  COUNTRY     -  US
 HV7551  USGS QUAD   -  ANACOSTIA (2016)
 HV7551
 HV7551                         *CURRENT SURVEY CONTROL
 HV7551  ______________________________________________________________________
 HV7551* NAD 83(1993) POSITION- 38 51 06.10794(N) 076 58 14.87612(W)   ADJUSTED
 HV7551* NAVD 88 ORTHO HEIGHT -    87.    (meters)      285.    (feet) SCALED
 HV7551  ______________________________________________________________________
 HV7551  GEOID HEIGHT    -        -32.254 (meters)                     GEOID18
 HV7551  LAPLACE CORR    -         -3.54  (seconds)                    DEFLEC18
 HV7551  HORZ ORDER      -  SECOND
 HV7551
 HV7551.The horizontal coordinates were established by classical geodetic methods
 HV7551.and adjusted by the National Geodetic Survey in November 1994.
 HV7551
 HV7551.The orthometric height was scaled from a topographic map.
 HV7551
 HV7551.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7551.GEOID18 height accuracy estimate available here.
 HV7551
 HV7551.Click photographs - Photos may exist for this station.
 HV7551
 HV7551.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7551
 HV7551. The following values were computed from the NAD 83(1993) position.
 HV7551
 HV7551;                    North         East     Units Scale Factor Converg.
 HV7551;SPC MD       -   131,543.670   402,534.729   MT  0.99994994   +0 01 06.0
 HV7551;SPC MD       -   431,572.86  1,320,649.36   sFT  0.99994994   +0 01 06.0
 HV7551;SPC VA N     - 2,132,643.599 3,632,733.394   MT  0.99995672   +0 57 15.8
 HV7551;SPC VA N     - 6,996,848.21 11,918,392.81   sFT  0.99995672   +0 57 15.8
 HV7551;UTM  18      - 4,302,164.879   328,982.132   MT  0.99996016   -1 14 11.7
 HV7551
 HV7551!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7551!SPC MD       -   0.99999145  x   0.99994994  =   0.99994139
 HV7551!SPC VA N     -   0.99999145  x   0.99995672  =   0.99994817
 HV7551!UTM  18      -   0.99999145  x   0.99996016  =   0.99995161
 HV7551
 HV7551:                Primary Azimuth Mark                     Grid Az
 HV7551:SPC MD       -  S E 160 A 1960                           008 44 12.0
 HV7551:SPC VA N     -  S E 160 A 1960                           007 48 02.2
 HV7551:UTM  18      -  S E 160 A 1960                           009 59 29.7
 HV7551
 HV7551_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2898202164(NAD 83)
 HV7551
 HV7551|---------------------------------------------------------------------|
 HV7551| PID    Reference Object                     Distance      Geod. Az  |
 HV7551|                                                           dddmmss.s |
 HV7551| HV7585 STANTON SCHOOL STANDPIPE            APPROX. 0.8 KM 0062723.2 |
 HV7551| HV7553 S E 160 A 1960                      APPROX. 0.6 KM 0084518.0 |
 HV7551| HV7710 PEPCO CENTER STK OF THREE STKS      APPROX. 5.2 KM 0105815.2 |
 HV7551| CX2793 GARFIELD RM                          46.660 METERS 25445     |
 HV7551| HV7547 S E 160 B 1960                      411.332 METERS 2545534.9 |
 HV7551| HV7567 NAVY YARD EAST WIRELESS MAST        APPROX. 3.2 KM 3170627.8 |
 HV7551|---------------------------------------------------------------------|
 HV7551
 HV7551                          SUPERSEDED SURVEY CONTROL
 HV7551
 HV7551  NAD 83(1991)-  38 51 06.10641(N)    076 58 14.87684(W) AD(       ) 2
 HV7551  NAD 83(1986)-  38 51 06.10579(N)    076 58 14.88827(W) AD(       ) 2
 HV7551  NAD 27      -  38 51 05.70500(N)    076 58 15.98300(W) AD(       ) 2
 HV7551  USSD        -  38 51 06.04100(N)    076 58 15.80800(W) AD(       ) 3
 HV7551
 HV7551.Superseded values are not recommended for survey control.
 HV7551
 HV7551.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7551.See file dsdata.pdf to determine how the superseded data were derived.
 HV7551
 HV7551_MARKER: Z = SEE DESCRIPTION
 HV7551_SETTING: 0 = UNSPECIFIED SETTING
 HV7551
 HV7551  HISTORY     - Date     Condition        Report By
 HV7551  HISTORY     - 1917     MONUMENTED       CGS
 HV7551  HISTORY     - 1938     MARK NOT FOUND   CGS
 HV7551  HISTORY     - 1960     MARK NOT FOUND   CGS
 HV7551  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7551
 HV7551                          STATION DESCRIPTION
 HV7551
 HV7551'DESCRIBED BY COAST AND GEODETIC SURVEY 1917 (CVH)
 HV7551'STATION IS ON THE ROOF OF GARFIELD SCHOOL.  MARKED BY A SINGLE TACK
 HV7551'IN THE TIN ROOF WITH REFERENCE POINTS AT THE FOLLOWING DISTANCES
 HV7551'AND BEARINGS--SE CORNER OF TRAP DOOR OF ROOF, 3.380 METERS (11.09
 HV7551'FEET), N 42 DEG 39 MIN W, NW VENTILATOR, FINIAL, 5.980 METERS
 HV7551'(19.62 FEET), N 40 DEG 36 MIN W, NE VENTILATOR, FINIAL, 6.805
 HV7551'METERS (22.33 FEET), N 28 DEG 55 MIN E. NE CORNER OF THE BRICK
 HV7551'CHIMNEY, 11.525 METERS (37.81 FEET), S 21 DEG 21 MIN W, AND
 HV7551'GRANITE REFERENCE MARK, A STANDARD BRONZE DISK SET IN CONCRETE
 HV7551'46.656 METERS (153.07 FEET), S 74 DEG 45 MIN W.
 HV7551
 HV7551                          STATION RECOVERY (1938)
 HV7551
 HV7551'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV7551'STATION RECOVERED.  THE TACK MARKING STATION WAS NOT SEARCHED
 HV7551'FOR, BUT THE SCHOOL IS STILL IN GOOD CONDITION AND THE REFERENCE
 HV7551'MEASUREMENTS TO VARIOUS PARTS OF THE BUILDING APPARENTLY WILL NOT
 HV7551'HAVE BEEN SUBJECT TO ANY CHANGE.  THE REFERENCE MARK COULD NOT BE
 HV7551'FOUND AFTER 1/2 HOUR SEARCH.
 HV7551
 HV7551                          STATION RECOVERY (1960)
 HV7551
 HV7551'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960 (CJM)
 HV7551'THE TACK MARKING THE STATION WAS NOT FOUND.  ALL REFERENCE MARKS
 HV7551'IN GOOD SHAPE.
 HV7551
 HV7551                          STATION RECOVERY (1971)
 HV7551
 HV7551'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7551'THE ORIGINAL DESCRIPTION IS ADEQUATE.  HOWEVER, THE TACK MARKING
 HV7551'THE STATION WAS NOT RECOVERED, THE BUILDING ON WHICH THE STATION
 HV7551'IS ON IS THE SAME AND THE STATION LOCATION CAN BE REDETERMINED
 HV7551'FROM REFERENCE MEASUREMENTS GIVEN.
 HV7551'
 HV7551'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2003 ***********************************************************************
 HV2003  DESIGNATION -  GATE
 HV2003  PID         -  HV2003
 HV2003  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2003  COUNTRY     -  US
 HV2003  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2003
 HV2003                         *CURRENT SURVEY CONTROL
 HV2003  ______________________________________________________________________
 HV2003* NAD 83(1993) POSITION- 38 52 48.39951(N) 077 02 25.14943(W)   ADJUSTED
 HV2003* NAVD 88 ORTHO HEIGHT -     4.867 (meters)       15.97  (feet) ADJUSTED
 HV2003  ______________________________________________________________________
 HV2003  GEOID HEIGHT    -        -32.100 (meters)                     GEOID18
 HV2003  LAPLACE CORR    -         -2.67  (seconds)                    DEFLEC18
 HV2003  DYNAMIC HEIGHT  -          4.864 (meters)       15.96  (feet) COMP
 HV2003  MODELED GRAVITY -    980,096.6   (mgal)                       NAVD 88
 HV2003
 HV2003  HORZ ORDER      -  THIRD
 HV2003  VERT ORDER      -  FIRST     CLASS II
 HV2003
 HV2003.The horizontal coordinates were established by classical geodetic methods
 HV2003.and adjusted by the National Geodetic Survey in November 1994.
 HV2003
 HV2003.The orthometric height was determined by differential leveling and
 HV2003.adjusted by the NATIONAL GEODETIC SURVEY
 HV2003.in June 1991.
 HV2003
 HV2003.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2003.GEOID18 height accuracy estimate available here.
 HV2003
 HV2003.Click photographs - Photos may exist for this station.
 HV2003
 HV2003.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2003
 HV2003.The dynamic height is computed by dividing the NAVD 88
 HV2003.geopotential number by the normal gravity value computed on the
 HV2003.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2003.degrees latitude (g = 980.6199 gals.).
 HV2003
 HV2003.The modeled gravity was interpolated from observed gravity values.
 HV2003
 HV2003. The following values were computed from the NAD 83(1993) position.
 HV2003
 HV2003;                    North         East     Units Scale Factor Converg.
 HV2003;SPC MD       -   134,698.237   396,501.574   MT  0.99994985   -0 01 31.1
 HV2003;SPC MD       -   441,922.47  1,300,855.58   sFT  0.99994985   -0 01 31.1
 HV2003;SPC VA N     - 2,135,699.193 3,626,649.454   MT  0.99995886   +0 54 39.6
 HV2003;SPC VA N     - 7,006,873.10 11,898,432.42   sFT  0.99995886   +0 54 39.6
 HV2003;UTM  18      - 4,305,450.936   323,019.396   MT  0.99998571   -1 16 51.7
 HV2003
 HV2003!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2003!SPC MD       -   1.00000427  x   0.99994985  =   0.99995412
 HV2003!SPC VA N     -   1.00000427  x   0.99995886  =   0.99996313
 HV2003!UTM  18      -   1.00000427  x   0.99998571  =   0.99998998
 HV2003
 HV2003:                Primary Azimuth Mark                     Grid Az
 HV2003:SPC MD       -  WASHINGTON MONUMENT                      023 00 53.9
 HV2003:SPC VA N     -  WASHINGTON MONUMENT                      022 04 43.2
 HV2003:UTM  18      -  WASHINGTON MONUMENT                      024 16 14.5
 HV2003
 HV2003_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2301905450(NAD 83)
 HV2003
 HV2003|---------------------------------------------------------------------|
 HV2003| PID    Reference Object                     Distance      Geod. Az  |
 HV2003|                                                           dddmmss.s |
 HV2003| HV4442 WASHINGTON MONUMENT                 APPROX. 1.1 KM 0225922.8 |
 HV2003| HV2004 GATE 2                                6.139 METERS 09201     |
 HV2003|---------------------------------------------------------------------|
 HV2003
 HV2003                          SUPERSEDED SURVEY CONTROL
 HV2003
 HV2003  NAD 83(1991)-  38 52 48.39823(N)    077 02 25.15091(W) AD(       ) 3
 HV2003  NAD 83(1986)-  38 52 48.39798(N)    077 02 25.16168(W) AD(       ) 3
 HV2003  NAD 27      -  38 52 47.99900(N)    077 02 26.23700(W) AD(       ) 3
 HV2003  NGVD 29               5.10   (m)           16.7    (f) LEVELING    3  
 HV2003  NGVD 29 (11/26/84)    5.102  (m)           16.74   (f) ADJUSTED    1 2
 HV2003
 HV2003.Superseded values are not recommended for survey control.
 HV2003
 HV2003.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2003.See file dsdata.pdf to determine how the superseded data were derived.
 HV2003
 HV2003_MARKER: DE = TRAVERSE STATION DISK
 HV2003_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV2003_SP_SET: OVERPASS
 HV2003_STAMPING: GATE 1935
 HV2003_MARK LOGO: CGS
 HV2003_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV2003
 HV2003  HISTORY     - Date     Condition        Report By
 HV2003  HISTORY     - 1935     MONUMENTED       CGS
 HV2003  HISTORY     - 1939     GOOD             CGS
 HV2003  HISTORY     - 1946     GOOD             CGS
 HV2003  HISTORY     - 1959     GOOD             CGS
 HV2003  HISTORY     - 1959     GOOD             CGS
 HV2003  HISTORY     - 1970     MARK NOT FOUND   NGS
 HV2003  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV2003
 HV2003                          STATION DESCRIPTION
 HV2003
 HV2003'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (LOC)
 HV2003'THIS TRAVERSE STATION IS A STANDARD BRONZE DISK STAMPED GATE 1935
 HV2003'SET FLUSH IN THE CONCRETE SIDEWALK 0.3 FOOT E OF THE CENTER LINE
 HV2003'OF THE CONCRETE INLET GATE BRIDGE (U.S. ENGINEERS, BUILT IN
 HV2003'1908-1909) PERMITTING ACCESS OF WATER FROM THE POTOMAC RIVER TO THE
 HV2003'TIDAL BASIN AS WELL AS CONNECTING THE ROSE GARDEN AND THE
 HV2003'POLO FIELD IN WEST POTOMAC PARK.  MARK IS AT THE SOUTHERN
 HV2003'SIDE OF THE BRIDGE, 1.4 FEET FROM THE SOUTHERN FACE OF THE
 HV2003'BRIDGE, AND 13.2 FEET S OF THE NORTHERN EDGE OF THE CONCRETE
 HV2003'SIDEWALK.  THIS MARK IS THE START OF THE 1 MILE SPEEDBOAT RACE
 HV2003'COURSE.
 HV2003
 HV2003                          STATION RECOVERY (1939)
 HV2003
 HV2003'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV2003'THIS IS A TRAVERSE STATION.  THE MARK WAS FOUND IN GOOD CONDITION.
 HV2003'THE ORIGINAL DESCRIPTION IS ADEQUATE.
 HV2003
 HV2003                          STATION RECOVERY (1946)
 HV2003
 HV2003'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV2003'STATION RECOVERED AS DESCRIBED AND FOUND TO BE IN GOOD CONDITION.
 HV2003'DESCRIPTION IS ADEQUATE.
 HV2003
 HV2003                          STATION RECOVERY (1959)
 HV2003
 HV2003'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (BFL)
 HV2003'RECOVERED AS DESCRIBED.  PREVIOUS DESCRIPTION ADEQUATE.
 HV2003
 HV2003                          STATION RECOVERY (1959)
 HV2003
 HV2003'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959
 HV2003'AT WASHINGTON.
 HV2003'AT THE INLET GATES TO THE TIDAL BASIN, AT THE CENTER OF THE
 HV2003'CONCRETE BRIDGE OVER THE GATES, 0.3 FOOT SOUTHEAST OF THE CENTER
 HV2003'LINE OF THE BRIDGE, 1.4 FEET NORTHEAST OF THE SOUTHEAST FACE
 HV2003'OF THE BRIDGE, AND IN THE SIDEWALK.
 HV2003
 HV2003                          STATION RECOVERY (1970)
 HV2003
 HV2003'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1970 (JBJ)
 HV2003'THE MARK HAS BEEN DESTROYED BY BRIDGE CONSTRUCTION.
 HV2003'
 HV2003'GATE 2 WAS ESTABLISHED IN THE NEAR VICINITY.  SEE DESCRIPTION
 HV2003'THEREOF.
 HV2003'
 HV2003'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN WASHINGTON DC.
 HV2003
 HV2003                          STATION RECOVERY (1971)
 HV2003
 HV2003'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971
 HV2003'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2004 ***********************************************************************
 HV2004  DESIGNATION -  GATE 2
 HV2004  PID         -  HV2004
 HV2004  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2004  COUNTRY     -  US
 HV2004  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2004
 HV2004                         *CURRENT SURVEY CONTROL
 HV2004  ______________________________________________________________________
 HV2004* NAD 83(1993) POSITION- 38 52 48.39252(N) 077 02 24.89489(W)   NO CHECK
 HV2004* NAVD 88 ORTHO HEIGHT -     4.777 (meters)       15.67  (feet) ADJUSTED
 HV2004  ______________________________________________________________________
 HV2004  GEOID HEIGHT    -        -32.100 (meters)                     GEOID18
 HV2004  LAPLACE CORR    -         -2.67  (seconds)                    DEFLEC18
 HV2004  DYNAMIC HEIGHT  -          4.774 (meters)       15.66  (feet) COMP
 HV2004  MODELED GRAVITY -    980,096.7   (mgal)                       NAVD 88
 HV2004
 HV2004  HORZ ORDER      -  THIRD
 HV2004  VERT ORDER      -  FIRST     CLASS II
 HV2004
 HV2004.The horizontal coordinates were established by classical geodetic methods
 HV2004.and adjusted by the National Geodetic Survey in November 1994.
 HV2004
 HV2004.No horizontal observational check was made to the station.
 HV2004
 HV2004.The orthometric height was determined by differential leveling and
 HV2004.adjusted by the NATIONAL GEODETIC SURVEY
 HV2004.in October 2012.
 HV2004
 HV2004.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2004.GEOID18 height accuracy estimate available here.
 HV2004
 HV2004.Click photographs - Photos may exist for this station.
 HV2004
 HV2004.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2004
 HV2004.The dynamic height is computed by dividing the NAVD 88
 HV2004.geopotential number by the normal gravity value computed on the
 HV2004.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2004.degrees latitude (g = 980.6199 gals.).
 HV2004
 HV2004.The modeled gravity was interpolated from observed gravity values.
 HV2004
 HV2004. The following values were computed from the NAD 83(1993) position.
 HV2004
 HV2004;                    North         East     Units Scale Factor Converg.
 HV2004;SPC MD       -   134,698.018   396,507.709   MT  0.99994985   -0 01 30.9
 HV2004;SPC MD       -   441,921.75  1,300,875.71   sFT  0.99994985   -0 01 30.9
 HV2004;SPC VA N     - 2,135,699.075 3,626,655.591   MT  0.99995886   +0 54 39.8
 HV2004;SPC VA N     - 7,006,872.72 11,898,452.55   sFT  0.99995886   +0 54 39.8
 HV2004;UTM  18      - 4,305,450.584   323,025.525   MT  0.99998568   -1 16 51.5
 HV2004
 HV2004!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2004!SPC MD       -   1.00000429  x   0.99994985  =   0.99995414
 HV2004!SPC VA N     -   1.00000429  x   0.99995886  =   0.99996315
 HV2004!UTM  18      -   1.00000429  x   0.99998568  =   0.99998997
 HV2004
 HV2004:                Primary Azimuth Mark                     Grid Az
 HV2004:SPC MD       -  WASHINGTON MONUMENT                      022 43 24.0
 HV2004:SPC VA N     -  WASHINGTON MONUMENT                      021 47 13.3
 HV2004:UTM  18      -  WASHINGTON MONUMENT                      023 58 44.6
 HV2004
 HV2004_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2302505450(NAD 83)
 HV2004
 HV2004|---------------------------------------------------------------------|
 HV2004| PID    Reference Object                     Distance      Geod. Az  |
 HV2004|                                                           dddmmss.s |
 HV2004| HV4442 WASHINGTON MONUMENT                 APPROX. 1.1 KM 0224153.1 |
 HV2004| DE5042 GATE 2 RP A                           9.800 METERS 12600     |
 HV2004| HV2003 GATE                                  6.139 METERS 27201     |
 HV2004|---------------------------------------------------------------------|
 HV2004
 HV2004                          SUPERSEDED SURVEY CONTROL
 HV2004
 HV2004  NAD 83(1991)-  38 52 48.39123(N)    077 02 24.89638(W) AD(       ) 3
 HV2004  NAD 83(1986)-  38 52 48.39099(N)    077 02 24.90713(W) AD(       ) 3
 HV2004  NAD 27      -  38 52 47.99203(N)    077 02 25.98247(W) AD(       ) 3
 HV2004  NAVD 88 (04/20/10)    4.780  (m)           15.68   (f) SUPERSEDED  1 2
 HV2004  NAVD 88 (06/15/91)    4.852  (m)           15.92   (f) SUPERSEDED  1 1
 HV2004  NGVD 29               5.09   (m)           16.7    (f) LEVELING    3  
 HV2004  NGVD 29 (11/26/84)    5.089  (m)           16.70   (f) ADJUSTED    1 1
 HV2004
 HV2004.Superseded values are not recommended for survey control.
 HV2004
 HV2004.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2004.See file dsdata.pdf to determine how the superseded data were derived.
 HV2004
 HV2004_MARKER: DS = TRIANGULATION STATION DISK
 HV2004_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV2004_SP_SET: BRIDGE SIDEWALK
 HV2004_STAMPING: TRAVERSE STATION GATE 2 1970
 HV2004_MARK LOGO: CGS
 HV2004_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2004_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV2004+SATELLITE: SATELLITE OBSERVATIONS - March 01, 2012
 HV2004
 HV2004  HISTORY     - Date     Condition        Report By
 HV2004  HISTORY     - 1970     MONUMENTED       NGS
 HV2004  HISTORY     - 1971     GOOD             NGS
 HV2004  HISTORY     - 1972     GOOD             NGS
 HV2004  HISTORY     - 20020902 GOOD             INDIV
 HV2004  HISTORY     - 20040612 GOOD             NGS
 HV2004  HISTORY     - 20070928 GOOD             NGS
 HV2004  HISTORY     - 20081224 GOOD             NGS
 HV2004  HISTORY     - 20100314 GOOD             GEOCAC
 HV2004  HISTORY     - 20120301 GOOD             NGS
 HV2004
 HV2004                          STATION DESCRIPTION
 HV2004
 HV2004'DESCRIBED BY NATIONAL GEODETIC SURVEY 1970 (JBJ)
 HV2004'THE MARK IS IN THE INLET TIDAL BASIN BRIDGE, IN WEST POTOMAC
 HV2004'PARK, WASHINGTON D.C.
 HV2004'
 HV2004'THE MARK IS A STANDARD TRIANGULATION STATION DISK, STAMPED
 HV2004'TRAVERSE STATION GATE 2 1970, CEMENTED IN A DRILL HOLE IN A
 HV2004'CONCRETE SIDEWALK, ON THE SOUTH SIDE OF THE BRIDGE.  IT IS 17.4
 HV2004'FEET SOUTH OF THE CENTERLINE OF THE BRIDGE, 10.3 FEET NORTH
 HV2004'OF A PEDESTAL ON THE SOUTH FACE OF THE BRIDGE, 2.6 FEET WEST
 HV2004'OF THE THIRD PEDESTAL FROM THE EAST END OF THE BRIDGE AND 2.0
 HV2004'FEET SOUTH OF THE NORTH EDGE OF THE CURB.
 HV2004'
 HV2004'REFERENCE POINT A IS THE CENTER OF A BRONZE DISK ON TOP OF THE
 HV2004'SECOND PEDESTAL FROM THE EAST END OF THE BRIDGE.  THIS DISK
 HV2004'CAN BE REMOVED AND THE HOLE IS EVIDENTLY USED TO HOLD A FLAGPOLE.
 HV2004'IT IS 18.0 FEET SOUTH OF THE CENTERLINE OF THE BRIDGE AND 10.7
 HV2004'FEET NORTH OF THE SOUTH RAILING OF THE BRIDGE.
 HV2004
 HV2004                          STATION RECOVERY (1971)
 HV2004
 HV2004'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971
 HV2004'AT WASHINGTON.
 HV2004'AT WASHINGTON, D.C., ABOUT 0.3 MILE NORTHWEST ALONG OHIO DRIVE
 HV2004'FROM THE NORTHEAST END OF THE RICHMOND, FREDERICKSBURG AND
 HV2004'POTOMAC RAILROAD BRIDGE OVER THE POTOMAC RIVER, AT THE OHIO DRIVE
 HV2004'BRIDGE AND INLET GATE TO THE TIDAL BASIN AT WEST POTOMAC PARK,
 HV2004'17 FEET SOUTHWEST OF THE CENTER LINE OF THE DRIVE, SET IN THE
 HV2004'TOP OF A CONCRETE WALK WHICH OVERLOOKS THE INLET, 7 1/2 FEET
 HV2004'SOUTHEAST OF THE CENTER LINE OF THE GATE BELOW THE BRIDGE, 2.8
 HV2004'FEET NORTHWEST OF AN IMITATION STONE PILLAR, AND ABOUT 1 FOOT
 HV2004'ABOVE THE LEVEL OF THE DRIVE.
 HV2004
 HV2004                          STATION RECOVERY (1972)
 HV2004
 HV2004'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1972 (RDO)
 HV2004'STATION MARK AND REFERENCE POINT A WERE RECOVERED IN GOOD
 HV2004'CONDITION.  DESCRIPITION BY V. WILSON OF 1970 IS ADEQUATE FOR
 HV2004'RECOVERY.
 HV2004
 HV2004                          STATION RECOVERY (2002)
 HV2004
 HV2004'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 HV2004'RECOVERED IN GOOD CONDITION.
 HV2004
 HV2004                          STATION RECOVERY (2004)
 HV2004
 HV2004'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2004 (DW)
 HV2004'RECOVERED IN GOOD CONDITION.
 HV2004
 HV2004                          STATION RECOVERY (2007)
 HV2004
 HV2004'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2007 (DRD)
 HV2004'RECOVERED IN GOOD CONDITION.
 HV2004
 HV2004                          STATION RECOVERY (2008)
 HV2004
 HV2004'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV2004'RECOVERED AS DESCRIBED.
 HV2004
 HV2004                          STATION RECOVERY (2010)
 HV2004
 HV2004'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 HV2004'RECOVERED IN GOOD CONDITION.
 HV2004
 HV2004                          STATION RECOVERY (2012)
 HV2004
 HV2004'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV2004'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4055 ***********************************************************************
 HV4055  DESIGNATION -  GB 1913
 HV4055  PID         -  HV4055
 HV4055  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4055  COUNTRY     -  US
 HV4055  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4055
 HV4055                         *CURRENT SURVEY CONTROL
 HV4055  ______________________________________________________________________
 HV4055* NAD 83(1993) POSITION- 38 52 55.52345(N) 077 02 41.04374(W)   ADJUSTED
 HV4055* NAVD 88 ORTHO HEIGHT -     3.    (meters)       10.    (feet) SCALED
 HV4055  ______________________________________________________________________
 HV4055  GEOID HEIGHT    -        -32.090 (meters)                     GEOID18
 HV4055  LAPLACE CORR    -         -2.63  (seconds)                    DEFLEC18
 HV4055  HORZ ORDER      -  THIRD
 HV4055
 HV4055.The horizontal coordinates were established by classical geodetic methods
 HV4055.and adjusted by the National Geodetic Survey in November 1994.
 HV4055
 HV4055.The orthometric height was scaled from a topographic map.
 HV4055
 HV4055.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4055.GEOID18 height accuracy estimate available here.
 HV4055
 HV4055.Click photographs - Photos may exist for this station.
 HV4055
 HV4055.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4055
 HV4055. The following values were computed from the NAD 83(1993) position.
 HV4055
 HV4055;                    North         East     Units Scale Factor Converg.
 HV4055;SPC MD       -   134,918.085   396,118.594   MT  0.99994985   -0 01 41.1
 HV4055;SPC MD       -   442,643.75  1,299,599.09   sFT  0.99994985   -0 01 41.1
 HV4055;SPC VA N     - 2,135,912.756 3,626,262.928   MT  0.99995902   +0 54 29.7
 HV4055;SPC VA N     - 7,007,573.77 11,897,164.29   sFT  0.99995902   +0 54 29.7
 HV4055;UTM  18      - 4,305,679.133   322,641.312   MT  0.99998736   -1 17 01.9
 HV4055
 HV4055!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4055!SPC MD       -   1.00000460  x   0.99994985  =   0.99995445
 HV4055!SPC VA N     -   1.00000460  x   0.99995902  =   0.99996362
 HV4055!UTM  18      -   1.00000460  x   0.99998736  =   0.99999196
 HV4055
 HV4055:                Primary Azimuth Mark                     Grid Az
 HV4055:SPC MD       -  P                                        193 17 06.3
 HV4055:SPC VA N     -  P                                        192 20 55.5
 HV4055:UTM  18      -  P                                        194 32 27.1
 HV4055
 HV4055_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2264105679(NAD 83)
 HV4055
 HV4055|---------------------------------------------------------------------|
 HV4055| PID    Reference Object                     Distance      Geod. Az  |
 HV4055|                                                           dddmmss.s |
 HV4055| HV4253 HB 1913                             316.056 METERS 13015     |
 HV4055| HV4256 P                                   APPROX. 0.7 KM 1931525.2 |
 HV4055| HV4228 N                                   APPROX. 0.6 KM 2223958.4 |
 HV4055| HV4279 F B 1913                            279.933 METERS 31353     |
 HV4055|---------------------------------------------------------------------|
 HV4055
 HV4055                          SUPERSEDED SURVEY CONTROL
 HV4055
 HV4055  NAD 83(1991)-  38 52 55.52216(N)    077 02 41.04522(W) AD(       ) 3
 HV4055  NAD 83(1986)-  38 52 55.52191(N)    077 02 41.05588(W) AD(       ) 3
 HV4055  NAD 27      -  38 52 55.12200(N)    077 02 42.13300(W) AD(       ) 3
 HV4055  USSD        -  38 52 55.46000(N)    077 02 41.96400(W) AD(       ) 3
 HV4055
 HV4055.Superseded values are not recommended for survey control.
 HV4055
 HV4055.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4055.See file dsdata.pdf to determine how the superseded data were derived.
 HV4055
 HV4055_MARKER: I = METAL ROD
 HV4055_SETTING: 0 = UNSPECIFIED SETTING
 HV4055_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4055
 HV4055  HISTORY     - Date     Condition        Report By
 HV4055  HISTORY     - 1913     MONUMENTED       CGS
 HV4055  HISTORY     - 1939     MARK NOT FOUND   CGS
 HV4055
 HV4055                          STATION DESCRIPTION
 HV4055
 HV4055'DESCRIBED BY COAST AND GEODETIC SURVEY 1913
 HV4055'STATION IS IN CONCRETE MONUMENT, 8-INCH CAST-IRON PIPE CENTERED
 HV4055'WITH 1/4-INCH BRASS ROD, 0.1 FOOT ABOVE GROUND, ABOUT 6 FEET
 HV4055'ABOVE MEAN LOW WATER, 6.6 FEET NE OF EDGE OF WALL, 16.5
 HV4055'FEET SW OF 26-INCH WILLOW TREE, 25.5 FEET NW OF TWO FORKED
 HV4055'18-INCH AND 24-INCH WILLOW TREE.
 HV4055
 HV4055                          STATION RECOVERY (1939)
 HV4055
 HV4055'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4055'STATION IS PROBABLY LOST.  CHANGES HAVE TAKEN PLACE WHICH
 HV4055'MAKE THE ORIGINAL DESCRIPTION INADEQUATE.  A BRIEF SEARCH
 HV4055'INDICATED THAT THE MARK HAS PROBABLY BEEN DESTROYED.  IF A
 HV4055'RECOVERY IS POSSIBLE, WHICH SEEMS DOUBTFUL, IT WOULD HAVE TO
 HV4055'BE MADE BY AN AZIMUTH AND DISTANCE FROM A NEARBY STATION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4324 ***********************************************************************
 HV4324  DESIGNATION -  GEOPHYSIC
 HV4324  PID         -  HV4324
 HV4324  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4324  COUNTRY     -  US
 HV4324  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4324
 HV4324                         *CURRENT SURVEY CONTROL
 HV4324  ______________________________________________________________________
 HV4324* NAD 83(1993) POSITION- 38 56 34.79960(N) 077 03 24.98579(W)   ADJUSTED
 HV4324  ______________________________________________________________________
 HV4324  GEOID HEIGHT    -        -31.976 (meters)                     GEOID18
 HV4324  LAPLACE CORR    -         -2.90  (seconds)                    DEFLEC18
 HV4324  HORZ ORDER      -  THIRD
 HV4324
 HV4324.The horizontal coordinates were established by classical geodetic methods
 HV4324.and adjusted by the National Geodetic Survey in November 1994.
 HV4324
 HV4324.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4324.GEOID18 height accuracy estimate available here.
 HV4324
 HV4324.Click photographs - Photos may exist for this station.
 HV4324
 HV4324.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4324
 HV4324. The following values were computed from the NAD 83(1993) position.
 HV4324
 HV4324;                    North         East     Units Scale Factor Converg.
 HV4324;SPC MD       -   141,680.192   395,063.739   MT  0.99995053   -0 02 08.7
 HV4324;SPC MD       -   464,829.10  1,296,138.28   sFT  0.99995053   -0 02 08.7
 HV4324;SPC VA N     - 2,142,656.799 3,625,097.696   MT  0.99996448   +0 54 02.3
 HV4324;SPC VA N     - 7,029,699.85 11,893,341.36   sFT  0.99996448   +0 54 02.3
 HV4324;UTM  18      - 4,312,463.014   321,734.972   MT  0.99999132   -1 17 35.6
 HV4324
 HV4324_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2173412463(NAD 83)
 HV4324
 HV4324                          SUPERSEDED SURVEY CONTROL
 HV4324
 HV4324  NAD 83(1991)-  38 56 34.79890(N)    077 03 24.98706(W) AD(       ) 3
 HV4324  NAD 83(1986)-  38 56 34.79841(N)    077 03 24.99719(W) AD(       ) 3
 HV4324  NAD 27      -  38 56 34.40000(N)    077 03 26.07600(W) AD(       ) 3
 HV4324
 HV4324.Superseded values are not recommended for survey control.
 HV4324
 HV4324.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4324.See file dsdata.pdf to determine how the superseded data were derived.
 HV4324
 HV4324_MARKER: 84 = LIGHTNING ROD
 HV4324_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4324+SATELLITE: SATELLITE OBSERVATIONS - March 15, 2012
 HV4324
 HV4324  HISTORY     - Date     Condition        Report By
 HV4324  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4324  HISTORY     - 1971     GOOD             NGS
 HV4324  HISTORY     - 19950605 GOOD             USPSQD
 HV4324  HISTORY     - 20050806 GOOD             GEOCAC
 HV4324  HISTORY     - 20120315 GOOD             GEOCAC
 HV4324
 HV4324                          STATION DESCRIPTION
 HV4324
 HV4324'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4324'STATION IS THE NORTHWESTERN OF TWO LIGHTNING RODS ON THE CONCRETE
 HV4324'SMOKESTACK OF THE POWER HOUSE OF THE GEOPHYSICAL LABORATORY,
 HV4324'2801 UPTON STREET, N.W.
 HV4324'
 HV4324'THE TOP OF THE STACK IS APPROXIMATELY 75 FEET ABOVE THE SURROUNDING
 HV4324'GROUND LEVEL.
 HV4324
 HV4324                          STATION RECOVERY (1971)
 HV4324
 HV4324'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4324'STATION WAS RECOVERED AS PREVIOUSLY DESCRIBED.  BOTH LIGHTNING
 HV4324'RODS ARE STILL ON THE STACK.  STACK IS GREY, AND SETS 48 FEET
 HV4324'WEST OF SOUTHWEST CORNER OF THE GEOPHYSICAL LABORATORY BUILDING.
 HV4324
 HV4324                          STATION RECOVERY (1995)
 HV4324
 HV4324'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4324'RECOVERED IN GOOD CONDITION.
 HV4324
 HV4324                          STATION RECOVERY (2005)
 HV4324
 HV4324'RECOVERY NOTE BY GEOCACHING 2005 (APC)
 HV4324'THE CARNEGIE GEOPHYSICAL LABORATORY IS NOW THE LEVINE SCHOOL OF MUSIC.
 HV4324'
 HV4324
 HV4324                          STATION RECOVERY (2012)
 HV4324
 HV4324'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV4324'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV3961 ***********************************************************************
 HV3961  DESIGNATION -  GEORGETOWN UNIV LOWER SPIRE
 HV3961  PID         -  HV3961
 HV3961  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV3961  COUNTRY     -  US
 HV3961  USGS QUAD   -  WASHINGTON WEST (2016)
 HV3961
 HV3961                         *CURRENT SURVEY CONTROL
 HV3961  ______________________________________________________________________
 HV3961* NAD 83(1993) POSITION- 38 54 24.74069(N) 077 04 22.07541(W)   ADJUSTED
 HV3961  ______________________________________________________________________
 HV3961  GEOID HEIGHT    -        -32.007 (meters)                     GEOID18
 HV3961  LAPLACE CORR    -         -2.81  (seconds)                    DEFLEC18
 HV3961  HORZ ORDER      -  THIRD
 HV3961
 HV3961.The horizontal coordinates were established by classical geodetic methods
 HV3961.and adjusted by the National Geodetic Survey in November 1994.
 HV3961
 HV3961.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV3961.GEOID18 height accuracy estimate available here.
 HV3961
 HV3961.Click photographs - Photos may exist for this station.
 HV3961
 HV3961.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV3961
 HV3961. The following values were computed from the NAD 83(1993) position.
 HV3961
 HV3961;                    North         East     Units Scale Factor Converg.
 HV3961;SPC MD       -   137,670.713   393,685.766   MT  0.99994999   -0 02 44.5
 HV3961;SPC MD       -   451,674.66  1,291,617.38   sFT  0.99994999   -0 02 44.5
 HV3961;SPC VA N     - 2,138,625.285 3,623,785.416   MT  0.99996111   +0 53 26.7
 HV3961;SPC VA N     - 7,016,473.12 11,889,035.99   sFT  0.99996111   +0 53 26.7
 HV3961;UTM  18      - 4,308,484.551   320,269.311   MT  0.99999779   -1 18 07.9
 HV3961
 HV3961_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2026908484(NAD 83)
 HV3961
 HV3961                          SUPERSEDED SURVEY CONTROL
 HV3961
 HV3961  NAD 83(1991)-  38 54 24.73947(N)    077 04 22.07702(W) AD(       ) 3
 HV3961  NAD 83(1986)-  38 54 24.73912(N)    077 04 22.08709(W) AD(       ) 3
 HV3961  NAD 27      -  38 54 24.33900(N)    077 04 23.15900(W) AD(       ) 3
 HV3961
 HV3961.Superseded values are not recommended for survey control.
 HV3961
 HV3961.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV3961.See file dsdata.pdf to determine how the superseded data were derived.
 HV3961
 HV3961_MARKER: 89 = SPIRE
 HV3961
 HV3961  HISTORY     - Date     Condition        Report By
 HV3961  HISTORY     - 1935     FIRST OBSERVED   CGS
 HV3961  HISTORY     - 1938     GOOD             CGS
 HV3961  HISTORY     - 1946     GOOD             CGS
 HV3961  HISTORY     - 1946     GOOD             CGS
 HV3961  HISTORY     - 1959     GOOD             CGS
 HV3961  HISTORY     - 1961     GOOD             CGS
 HV3961  HISTORY     - 1974     GOOD             NGS
 HV3961  HISTORY     - 1979     GOOD             NGS
 HV3961  HISTORY     - 19950607 GOOD             USPSQD
 HV3961  HISTORY     - 20061119 GOOD             GEOCAC
 HV3961
 HV3961                          STATION DESCRIPTION
 HV3961
 HV3961'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV3961'THIS IS AN UNOCCUPIED STATION.  THE OBJECT OBSERVED UPON WAS THE
 HV3961'SINGLE FINIAL ON THE LOWER OF THE TWO PROMINENT SPIRES ON THE
 HV3961'MAIN BUILDING AT GEORGETOWN UNIVERSITY.
 HV3961
 HV3961                          STATION RECOVERY (1938)
 HV3961
 HV3961'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV3961'STATION RECOVERED AS DESCRIBED.
 HV3961
 HV3961                          STATION RECOVERY (1946)
 HV3961
 HV3961'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV3961'STATION RECOVERED AS DESCRIBED AND FOUND TO BE IN GOOD CONDITION.
 HV3961'DESCRIPTION IS ADEQUATE.
 HV3961
 HV3961                          STATION RECOVERY (1946)
 HV3961
 HV3961'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (RCB)
 HV3961'STATION RECOVERD AS DESCRIBED.  A COMPLETE NEW DESCRIPTION
 HV3961'FOLLOWS--THIS IS AN UNOCCUPIED STATION.  THE STATION OBSERVED
 HV3961'UPON IS THE LOWER OF THE TWO PROMINENT SPIRES ON THE MAIN
 HV3961'BUILDING AT GEORGETOWN UNIVERSITY.
 HV3961
 HV3961                          STATION RECOVERY (1959)
 HV3961
 HV3961'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (JKR)
 HV3961'THIS INTERSECTION STATION WAS RECOVERED IN GOOD CONDITION AS
 HV3961'DESCRIBED.
 HV3961
 HV3961                          STATION RECOVERY (1961)
 HV3961
 HV3961'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1961 (JPP)
 HV3961'THIS STATION RECOVERED AS DESCRIBED AND WAS FOUND TO BE IN GOOD
 HV3961'CONDITION.
 HV3961
 HV3961                          STATION RECOVERY (1974)
 HV3961
 HV3961'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974 (GWJ)
 HV3961'STATION RECOVERED AS DESCRIBED.
 HV3961
 HV3961                          STATION RECOVERY (1979)
 HV3961
 HV3961'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 (BMP)
 HV3961'THE LANDMARK INTERSECTED WAS THE LOWER OF THE TWO PROMINENT
 HV3961'SPIRES IN THE MAIN BUILDINGS AT GEORGETOWN UNIVERSITY IN
 HV3961'WASHINGTON D.C. THE BUILDING IS NOW CALLED HEALEY HALL.
 HV3961
 HV3961                          STATION RECOVERY (1995)
 HV3961
 HV3961'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV3961'RECOVERED IN GOOD CONDITION.
 HV3961
 HV3961                          STATION RECOVERY (2006)
 HV3961
 HV3961'RECOVERY NOTE BY GEOCACHING 2006 (APC)
 HV3961'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4273 ***********************************************************************
 HV4273  DESIGNATION -  GEORGIA WSSD 1933
 HV4273  PID         -  HV4273
 HV4273  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4273  COUNTRY     -  US
 HV4273  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4273
 HV4273                         *CURRENT SURVEY CONTROL
 HV4273  ______________________________________________________________________
 HV4273* NAD 83(1993) POSITION- 38 58 56.84946(N) 077 01 33.85528(W)   ADJUSTED
 HV4273* NAVD 88 ORTHO HEIGHT -   102.    (meters)      335.    (feet) SCALED
 HV4273  ______________________________________________________________________
 HV4273  GEOID HEIGHT    -        -31.981 (meters)                     GEOID18
 HV4273  LAPLACE CORR    -         -2.65  (seconds)                    DEFLEC18
 HV4273  HORZ ORDER      -  THIRD
 HV4273
 HV4273.The horizontal coordinates were established by classical geodetic methods
 HV4273.and adjusted by the National Geodetic Survey in November 1994.
 HV4273
 HV4273.The orthometric height was scaled from a topographic map.
 HV4273
 HV4273.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4273.GEOID18 height accuracy estimate available here.
 HV4273
 HV4273.Click photographs - Photos may exist for this station.
 HV4273
 HV4273.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4273
 HV4273. The following values were computed from the NAD 83(1993) position.
 HV4273
 HV4273;                    North         East     Units Scale Factor Converg.
 HV4273;SPC MD       -   146,059.214   397,741.123   MT  0.99995157   -0 00 58.9
 HV4273;SPC MD       -   479,195.94  1,304,922.33   sFT  0.99995157   -0 00 58.9
 HV4273;SPC VA N     - 2,147,079.057 3,627,703.204   MT  0.99996863   +0 55 11.7
 HV4273;SPC VA N     - 7,044,208.54 11,901,889.60   sFT  0.99996863   +0 55 11.7
 HV4273;UTM  18      - 4,316,782.347   324,507.945   MT  0.99997924   -1 16 29.6
 HV4273
 HV4273!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4273!SPC MD       -   0.99998905  x   0.99995157  =   0.99994062
 HV4273!SPC VA N     -   0.99998905  x   0.99996863  =   0.99995768
 HV4273!UTM  18      -   0.99998905  x   0.99997924  =   0.99996829
 HV4273
 HV4273:                Primary Azimuth Mark                     Grid Az
 HV4273:SPC MD       -  COLLEGE PARK UNIV OF MD TANK             088 11 36.0
 HV4273:SPC VA N     -  COLLEGE PARK UNIV OF MD TANK             087 15 25.4
 HV4273:UTM  18      -  COLLEGE PARK UNIV OF MD TANK             089 27 06.7
 HV4273
 HV4273_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2450716782(NAD 83)
 HV4273
 HV4273|---------------------------------------------------------------------|
 HV4273| PID    Reference Object                     Distance      Geod. Az  |
 HV4273|                                                           dddmmss.s |
 HV4273| HV7664 COLLEGE PARK UNIV OF MD TANK        APPROX. 7.1 KM 0881037.1 |
 HV4273| HV4369 STANDPIPE NEAR STA DULCE            APPROX. 7.4 KM 2733312.8 |
 HV4273|---------------------------------------------------------------------|
 HV4273
 HV4273                          SUPERSEDED SURVEY CONTROL
 HV4273
 HV4273  NAD 83(1991)-  38 58 56.84904(N)    077 01 33.85614(W) AD(       ) 3
 HV4273  NAD 83(1986)-  38 58 56.84814(N)    077 01 33.86623(W) AD(       ) 3
 HV4273  NAD 27      -  38 58 56.45400(N)    077 01 34.94500(W) AD(       ) 3
 HV4273
 HV4273.Superseded values are not recommended for survey control.
 HV4273
 HV4273.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4273.See file dsdata.pdf to determine how the superseded data were derived.
 HV4273
 HV4273_MARKER: N = NAIL
 HV4273_SETTING: 0 = UNSPECIFIED SETTING
 HV4273_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4273
 HV4273  HISTORY     - Date     Condition        Report By
 HV4273  HISTORY     - 1955     MONUMENTED       WSSC
 HV4273
 HV4273                          STATION DESCRIPTION
 HV4273
 HV4273'DESCRIBED BY WASH SUBURB SAN COMM 1955 (JHP)
 HV4273'MARKED BY A NAIL IN THE ROOF OF AN EAST PENTHOUSE OF A SOUTH
 HV4273'APARTMENT HOUSE ON THE EAST SIDE OF GEORGIA AVENUE.  APPROXIMATELY
 HV4273'600 FEET SOUTH OF BLAIR ROAD IN THE DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9071 ***********************************************************************
 HV9071  DESIGNATION -  GOLF
 HV9071  PID         -  HV9071
 HV9071  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9071  COUNTRY     -  US
 HV9071  USGS QUAD   -  ALEXANDRIA (2019)
 HV9071
 HV9071                         *CURRENT SURVEY CONTROL
 HV9071  ______________________________________________________________________
 HV9071* NAD 83(2011) POSITION- 38 51 43.92338(N) 077 01 01.86560(W)   NO CHECK
 HV9071* NAD 83(2011) ELLIP HT-   -28.680 (meters)        (06/27/12)   NO CHECK
 HV9071* NAD 83(2011) EPOCH   -  2010.00
 HV9071* NAVD 88 ORTHO HEIGHT -     3.505 (meters)       11.50  (feet) ADJUSTED
 HV9071  ______________________________________________________________________
 HV9071  GEOID HEIGHT    -        -32.166 (meters)                     GEOID18
 HV9071  NAD 83(2011) X  -  1,117,209.744 (meters)                     COMP
 HV9071  NAD 83(2011) Y  - -4,845,797.567 (meters)                     COMP
 HV9071  NAD 83(2011) Z  -  3,980,398.957 (meters)                     COMP
 HV9071  LAPLACE CORR    -         -2.99  (seconds)                    DEFLEC18
 HV9071  DYNAMIC HEIGHT  -          3.503 (meters)       11.49  (feet) COMP
 HV9071  MODELED GRAVITY -    980,095.1   (mgal)                       NAVD 88
 HV9071
 HV9071  VERT ORDER      -  FIRST     CLASS II
 HV9071
 HV9071  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV9071  Standards:
 HV9071         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV9071            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV9071  -------------------------------------------------------------------
 HV9071  NETWORK    4.21  19.19           1.66   1.75   9.79      0.26720441
 HV9071  -------------------------------------------------------------------
 HV9071  Click here for local accuracies and other accuracy information.
 HV9071
 HV9071.The horizontal coordinates were established by GPS observations
 HV9071.and adjusted by the National Geodetic Survey in June 2012.
 HV9071
 HV9071.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV9071.been affixed to the stable North American tectonic plate. See 
 HV9071.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV9071
 HV9071.The horizontal coordinates are valid at the epoch date displayed above
 HV9071.which is a decimal equivalence of Year/Month/Day.
 HV9071
 HV9071.No horizontal observational check was made to the station.
 HV9071
 HV9071.The orthometric height was determined by differential leveling and
 HV9071.adjusted by the NATIONAL GEODETIC SURVEY
 HV9071.in February 1993.
 HV9071
 HV9071.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9071.GEOID18 height accuracy estimate available here.
 HV9071
 HV9071.Click photographs - Photos may exist for this station.
 HV9071
 HV9071.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV9071
 HV9071.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9071
 HV9071.The ellipsoidal height was determined by GPS observations
 HV9071.and is referenced to NAD 83.
 HV9071
 HV9071.The dynamic height is computed by dividing the NAVD 88
 HV9071.geopotential number by the normal gravity value computed on the
 HV9071.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV9071.degrees latitude (g = 980.6199 gals.).
 HV9071
 HV9071.The modeled gravity was interpolated from observed gravity values.
 HV9071
 HV9071. The following values were computed from the NAD 83(2011) position.
 HV9071
 HV9071;                    North         East     Units Scale Factor Converg.
 HV9071;SPC MD       -   132,709.457   398,508.526   MT  0.99994988   -0 00 38.8
 HV9071;SPC MD       -   435,397.61  1,307,440.06   sFT  0.99994988   -0 00 38.8
 HV9071;SPC VA N     - 2,133,743.457 3,628,688.652   MT  0.99995748   +0 55 31.6
 HV9071;SPC VA N     - 7,000,456.66 11,905,122.69   sFT  0.99995748   +0 55 31.6
 HV9071;UTM  18      - 4,303,418.597   324,982.354   MT  0.99997720   -1 15 57.6
 HV9071
 HV9071!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9071!SPC MD       -   1.00000450  x   0.99994988  =   0.99995438
 HV9071!SPC VA N     -   1.00000450  x   0.99995748  =   0.99996198
 HV9071!UTM  18      -   1.00000450  x   0.99997720  =   0.99998170
 HV9071
 HV9071_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2498203418(NAD 83)
 HV9071
 HV9071                          SUPERSEDED SURVEY CONTROL
 HV9071
 HV9071  NAD 83(2007)-  38 51 43.92356(N)    077 01 01.86648(W) AD(2002.00) 0
 HV9071  ELLIP H (02/10/07)  -28.656  (m)                       GP(2002.00)    
 HV9071  ELLIP H (08/09/02)  -28.651  (m)                       GP(       ) 4 2
 HV9071  NAD 83(1993)-  38 51 43.92439(N)    077 01 01.86650(W) AD(       ) 1
 HV9071  ELLIP H (06/29/94)  -28.631  (m)                       GP(       ) 4 1
 HV9071  NAD 83(1993)-  38 51 43.92442(N)    077 01 01.86649(W) AD(       ) 1
 HV9071  ELLIP H (04/04/94)  -28.631  (m)                       GP(       ) 4 1
 HV9071  NAD 83(1991)-  38 51 43.92447(N)    077 01 01.86637(W) AD(       ) 1
 HV9071  ELLIP H (12/31/92)  -28.631  (m)                       GP(       ) 4 2
 HV9071  NAVD 88               3.50   (m)           11.5    (f) LEVELING    3  
 HV9071  NAVD 88 (12/31/92)    3.5    (m)  GEOID90  model used  GPS OBS        
 HV9071  NGVD 29 (08/12/92)    3.742  (m)           12.28   (f) ADJUSTED    1 2
 HV9071
 HV9071.Superseded values are not recommended for survey control.
 HV9071
 HV9071.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9071.See file dsdata.pdf to determine how the superseded data were derived.
 HV9071
 HV9071_MARKER: I = METAL ROD
 HV9071_SETTING: 59 = STAINLESS STEEL ROD IN SLEEVE (10 FT.+)
 HV9071_STAMPING: GOLF 1992
 HV9071_MARK LOGO: NGS
 HV9071_PROJECTION: FLUSH
 HV9071_MAGNETIC: I = MARKER IS A STEEL ROD
 HV9071_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV9071_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV9071+SATELLITE: SATELLITE OBSERVATIONS - August 25, 2009
 HV9071_ROD/PIPE-DEPTH: 13.4 meters
 HV9071_SLEEVE-DEPTH  : 0.9 meters
 HV9071
 HV9071  HISTORY     - Date     Condition        Report By
 HV9071  HISTORY     - 1992     MONUMENTED       NGS
 HV9071  HISTORY     - 19920513 GOOD             NGS
 HV9071  HISTORY     - 20010316 GOOD             CHANCE
 HV9071  HISTORY     - 20020929 GOOD             JCLS
 HV9071  HISTORY     - 20030612 GOOD             DMW
 HV9071  HISTORY     - 20090825 GOOD             JMTMD
 HV9071
 HV9071                          STATION DESCRIPTION
 HV9071
 HV9071'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9071'THE STATION IS LOCATED ABOUT 3.2 KM (1.99 MI) SOUTH FROM THE U.S.
 HV9071'CAPITOL BUILDING IN WASHINGTON, D.C., ON THE SOUTH END OF FORT MCNAIR,
 HV9071'IN THE CENTER OF A TRAFFIC CIRCLE IN THE MIDDLE OF A PAR THREE GOLF
 HV9071'COURSE.  OWNERSHIP--U.S. ARMY, DIRECTORATE OF PUBLIC WORKS,
 HV9071'(ANTW-END), ATTENTION CHARLES R. CHALFANT, BUILDING 203, FORT MYERS,
 HV9071'ARLINGTON, VA. 22211-5050.  TELEPHONE NUMBER 703-696-6730.
 HV9071'TO REACH THE STATION FROM THE JUNCTION OF INDEPENDENCE AVENUE AND
 HV9071'SOUTHWEST 12TH STREET IN DOWNTOWN WASHINGTON, D.C. GO SOUTH ON
 HV9071'SOUTHWEST 12TH STREET FOR 0.48 KM (0.30 MI) TO A TUNNEL.  CONTINUE
 HV9071'SOUTHERLY ON MAINE AVENUE FOR 1.3 KM (0.81 MI) TO 4TH STREET.  TURN
 HV9071'RIGHT, SOUTH, ON 4TH STREET FOR 0.64 KM (0.40 MI) TO P STREET AND THE
 HV9071'MAIN GATE TO FORT MCNAIR.  PASS THROUGH GATE, SOUTH, FOR 0.16 KM
 HV9071'(0.10 MI) TO B STREET.  TURN RIGHT, WEST, FOR 0.16 KM (0.10 MI) TO
 HV9071'SECOND AVENUE.  TURN LEFT, SOUTH, ON SECOND STREET FOR 1.0 KM
 HV9071'(0.62 MI) TO E STREET.  TURN LEFT, EAST, ON E STREET FOR 0.08 KM
 HV9071'(0.05 MI) TO A TRAFFIC CIRCLE AND THE STATION.
 HV9071'THE STATION IS SET 16.7 M (54.79 FT) EAST FROM A NO LEFT TURN SIGN AND
 HV9071'15.9 M (52.17 FT) WEST FROM AN ARTILLERY CANNON.
 HV9071
 HV9071                          STATION RECOVERY (1992)
 HV9071
 HV9071'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV9071'0.5 KM (0.30 MI) SOUTHERLY AND WESTERLY ALONG B STREET FROM THE MAIN
 HV9071'GATE AT FORT MCNAIR, THENCE 1.0 KM (0.60 MI) SOUTHERLY ALONG 2ND
 HV9071'AVENUE, THENCE 0.1 KM (0.05 MI) EASTERLY ALONG E STREET TO A TRAFFIC
 HV9071'CIRCLE, 16.7 M (54.8 FT) EAST OF A SIGN (NO LEFT TURN), AND 15.9 M
 HV9071'(52.2 FT) WEST OF AN ARTILLERY PIECE.  NOTE--ACCESS TO THE DATUM
 HV9071'POINT IS THROUGH A 5-INCH LOGO CAP.
 HV9071
 HV9071                          STATION RECOVERY (2001)
 HV9071
 HV9071'RECOVERY NOTE BY JE CHANCE AND ASSOCIATES 2001 (CLG)
 HV9071'RECOVERED IN GOOD CONDITION.
 HV9071
 HV9071                          STATION RECOVERY (2002)
 HV9071
 HV9071'RECOVERY NOTE BY JOHN CHANCE LAND SURVEYS INC 2002 (MRY)
 HV9071'THIS IS NOW A HIGH SECURITY AREA. EXTENSIVE VEHICLE AND PERSONAL
 HV9071'INSPECTIONS WILL BE REQUIRED TO GAIN ACCESS.
 HV9071
 HV9071                          STATION RECOVERY (2003)
 HV9071
 HV9071'RECOVERY NOTE BY DAFT MCCUNE WALKER INCORPORATED 2003 (JMS)
 HV9071'THIS IS A HIGH SECURITY AREA AND EXTENSIVE VEHICLE AND PERSONAL
 HV9071'INFORMATION MUST BE SENT PRIOR TO ACCESS TO THE MILITARY GROUNDS.
 HV9071'INSPECTIONS WILL BE PERFORMED UPON ENTRY TO THE PROPERTY.
 HV9071
 HV9071                          STATION RECOVERY (2009)
 HV9071
 HV9071'RECOVERY NOTE BY JMT ENGINEERING 2009 (GPS)
 HV9071'FD (DID NOT USE)
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4146 ***********************************************************************
 HV4146  DESIGNATION -  GRANT
 HV4146  PID         -  HV4146
 HV4146  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4146  COUNTRY     -  US
 HV4146  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4146
 HV4146                         *CURRENT SURVEY CONTROL
 HV4146  ______________________________________________________________________
 HV4146* NAD 83(1993) POSITION- 38 56 38.60531(N) 077 00 39.85983(W)   ADJUSTED
 HV4146* NAVD 88 ORTHO HEIGHT -    52.    (meters)      171.    (feet) SCALED
 HV4146  ______________________________________________________________________
 HV4146  GEOID HEIGHT    -        -32.028 (meters)                     GEOID18
 HV4146  LAPLACE CORR    -         -2.61  (seconds)                    DEFLEC18
 HV4146  HORZ ORDER      -  SECOND
 HV4146
 HV4146.The horizontal coordinates were established by classical geodetic methods
 HV4146.and adjusted by the National Geodetic Survey in November 1994.
 HV4146
 HV4146.The orthometric height was scaled from a topographic map.
 HV4146
 HV4146.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4146.GEOID18 height accuracy estimate available here.
 HV4146
 HV4146.Click photographs - Photos may exist for this station.
 HV4146
 HV4146.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4146
 HV4146. The following values were computed from the NAD 83(1993) position.
 HV4146
 HV4146;                    North         East     Units Scale Factor Converg.
 HV4146;SPC MD       -   141,796.063   399,040.150   MT  0.99995056   -0 00 25.0
 HV4146;SPC MD       -   465,209.25  1,309,184.23   sFT  0.99995056   -0 00 25.0
 HV4146;SPC VA N     - 2,142,837.635 3,629,071.738   MT  0.99996459   +0 55 45.4
 HV4146;SPC VA N     - 7,030,293.14 11,906,379.53   sFT  0.99996459   +0 55 45.4
 HV4146;UTM  18      - 4,312,491.594   325,713.096   MT  0.99997405   -1 15 51.8
 HV4146
 HV4146!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4146!SPC MD       -   0.99999690  x   0.99995056  =   0.99994746
 HV4146!SPC VA N     -   0.99999690  x   0.99996459  =   0.99996149
 HV4146!UTM  18      -   0.99999690  x   0.99997405  =   0.99997095
 HV4146
 HV4146:                Primary Azimuth Mark                     Grid Az
 HV4146:SPC MD       -  BETHESDA BRADLEY HILLS S SPIPE           294 17 21.9
 HV4146:SPC VA N     -  BETHESDA BRADLEY HILLS S SPIPE           293 21 11.5
 HV4146:UTM  18      -  BETHESDA BRADLEY HILLS S SPIPE           295 32 48.7
 HV4146
 HV4146_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2571312491(NAD 83)
 HV4146
 HV4146|---------------------------------------------------------------------|
 HV4146| PID    Reference Object                     Distance      Geod. Az  |
 HV4146|                                                           dddmmss.s |
 HV4146| DE5055 GRANT RM 1                            5.473 METERS 14615     |
 HV4146| HV4147 HOME RESET                          270.172 METERS 17841     |
 HV4146| DE5056 GRANT RM 2                            4.634 METERS 18341     |
 HV4146| DE5057 GRANT RM 3                            8.779 METERS 20722     |
 HV4146| HV4105 BETHESDA RAD STA WJMD MAST          APPROX. 9.7 KM 2915905.3 |
 HV4146| HV4103 BETHESDA BRADLEY HILLS S SPIPE      APPROX. 9.7 KM 2941656.9 |
 HV4146|---------------------------------------------------------------------|
 HV4146
 HV4146                          SUPERSEDED SURVEY CONTROL
 HV4146
 HV4146  NAD 83(1991)-  38 56 38.60438(N)    077 00 39.86063(W) AD(       ) 2
 HV4146  NAD 83(1986)-  38 56 38.60387(N)    077 00 39.87111(W) AD(       ) 2
 HV4146  NAD 27      -  38 56 38.20631(N)    077 00 40.95527(W) AD(       ) 2
 HV4146
 HV4146.Superseded values are not recommended for survey control.
 HV4146
 HV4146.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4146.See file dsdata.pdf to determine how the superseded data were derived.
 HV4146
 HV4146_MARKER: Z = SEE DESCRIPTION
 HV4146_SETTING: 0 = UNSPECIFIED SETTING
 HV4146
 HV4146  HISTORY     - Date     Condition        Report By
 HV4146  HISTORY     - 1952     MONUMENTED       CGS
 HV4146
 HV4146                          STATION DESCRIPTION
 HV4146
 HV4146'DESCRIBED BY COAST AND GEODETIC SURVEY 1952 (IWS)
 HV4146'SOLDIERS HOME, GRANT BUILDING, N WING ROOF.  THE STATION COULD NOT
 HV4146'BE PERMANENTLY MARKED.  A TEMPORARY MARK (A CROSS MARK IN A
 HV4146'TRIANGLE SCRATCHED IN THE METAL ROOF) WILL BE DESTROYED WHEN THE
 HV4146'ROOF IS PAINTED.  THIS MARK IS 2.07 FEET E OF THE W ROOF LEDGE,
 HV4146'14.32 FEET S OF THE N ROOF LEDGE.
 HV4146'
 HV4146'R.M. 1 IS A STANDARD DISK SET IN A DRILL HOLE IN A CONCRETE BLOCK
 HV4146'ON ROOF.  IT IS ABOUT 1 FOOT HIGHER THAN THE STATION AND IS STAMPED
 HV4146'GRANT NO 1 1952.
 HV4146'
 HV4146'R.M. 2 IS A STANDARD DISK SET IN A DRILL HOLE IN A CONCRETE BLOCK
 HV4146'ON THE ROOF.  IT IS ABOUT 1 FOOT HIGHER THAN THE STATION AND IS
 HV4146'STAMPED GRANT NO 2 1952.
 HV4146'
 HV4146'R.M. 3 IS A STANDARD DISK SET IN A DRILL HOLE IN A CONCRETE BLOCK
 HV4146'ON THE ROOF.  IT IS ABOUT 6 INCHES HIGHER THAN THE STATION AND
 HV4146'IS STAMPED GRANT NO 3 1952.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4666 ***********************************************************************
 HV4666  DESIGNATION -  GREBLE 2
 HV4666  PID         -  HV4666
 HV4666  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4666  COUNTRY     -  US
 HV4666  USGS QUAD   -  ALEXANDRIA (2019)
 HV4666
 HV4666                         *CURRENT SURVEY CONTROL
 HV4666  ______________________________________________________________________
 HV4666* NAD 83(1993) POSITION- 38 49 31.99004(N) 077 00 56.32585(W)   ADJUSTED
 HV4666* NAVD 88 ORTHO HEIGHT -    46.    (meters)      151.    (feet) SCALED
 HV4666  ______________________________________________________________________
 HV4666  GEOID HEIGHT    -        -32.226 (meters)                     GEOID18
 HV4666  LAPLACE CORR    -         -2.97  (seconds)                    DEFLEC18
 HV4666  HORZ ORDER      -  SECOND
 HV4666
 HV4666.The horizontal coordinates were established by classical geodetic methods
 HV4666.and adjusted by the National Geodetic Survey in November 1994.
 HV4666
 HV4666.The orthometric height was scaled from a topographic map.
 HV4666
 HV4666.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4666.GEOID18 height accuracy estimate available here.
 HV4666
 HV4666.Click photographs - Photos may exist for this station.
 HV4666
 HV4666.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4666
 HV4666. The following values were computed from the NAD 83(1993) position.
 HV4666
 HV4666;                    North         East     Units Scale Factor Converg.
 HV4666;SPC MD       -   128,641.233   398,641.383   MT  0.99995023   -0 00 35.4
 HV4666;SPC MD       -   422,050.45  1,307,875.94   sFT  0.99995023   -0 00 35.4
 HV4666;SPC VA N     - 2,129,677.922 3,628,887.966   MT  0.99995496   +0 55 35.1
 HV4666;SPC VA N     - 6,987,118.32 11,905,776.60   sFT  0.99995496   +0 55 35.1
 HV4666;UTM  18      - 4,299,348.329   325,026.097   MT  0.99997701   -1 15 50.5
 HV4666
 HV4666!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4666!SPC MD       -   0.99999788  x   0.99995023  =   0.99994811
 HV4666!SPC VA N     -   0.99999788  x   0.99995496  =   0.99995284
 HV4666!UTM  18      -   0.99999788  x   0.99997701  =   0.99997489
 HV4666
 HV4666:                Primary Azimuth Mark                     Grid Az
 HV4666:SPC MD       -  GODDING RESET                            167 52 18.0
 HV4666:SPC VA N     -  GODDING RESET                            166 56 07.5
 HV4666:UTM  18      -  GODDING RESET                            169 07 33.1
 HV4666
 HV4666_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2502699348(NAD 83)
 HV4666
 HV4666|---------------------------------------------------------------------|
 HV4666| PID    Reference Object                     Distance      Geod. Az  |
 HV4666|                                                           dddmmss.s |
 HV4666| DE5059 GREBLE 2 RM 2                        30.035 METERS 00116     |
 HV4666| DE5058 GREBLE 2 RM 1                        30.220 METERS 06944     |
 HV4666| HV2352 GODDING RESET                       APPROX. 2.6 KM 1675142.6 |
 HV4666| HV4655 BELLEVUE NRL POWERHSE STK           APPROX. 1.1 KM 2435801.5 |
 HV4666| HV4631 ALEXANDRIA WASH MASON MEMORIAL      APPROX. 4.8 KM 2452138.8 |
 HV4666| HV4545 ALEXANDRIA DANGERFIELD IS TWR       APPROX. 2.2 KM 2814241.1 |
 HV4666|---------------------------------------------------------------------|
 HV4666
 HV4666                          SUPERSEDED SURVEY CONTROL
 HV4666
 HV4666  NAD 83(1991)-  38 49 31.98843(N)    077 00 56.32715(W) AD(       ) 2
 HV4666  NAD 83(1986)-  38 49 31.98826(N)    077 00 56.33866(W) AD(       ) 2
 HV4666  NAD 27      -  38 49 31.58300(N)    077 00 57.42000(W) AD(       ) 2
 HV4666
 HV4666.Superseded values are not recommended for survey control.
 HV4666
 HV4666.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4666.See file dsdata.pdf to determine how the superseded data were derived.
 HV4666
 HV4666_MARKER: DS = TRIANGULATION STATION DISK
 HV4666_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV4666
 HV4666  HISTORY     - Date     Condition        Report By
 HV4666  HISTORY     - 1935     MONUMENTED       CGS
 HV4666  HISTORY     - 1938     GOOD             CGS
 HV4666  HISTORY     - 1946     GOOD             CGS
 HV4666  HISTORY     - 1958     GOOD             CGS
 HV4666
 HV4666                          STATION DESCRIPTION
 HV4666
 HV4666'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4666'STATION IS LOCATED AT OLD FORT GREBLE, ON THE POINT OF A RIDGE
 HV4666'ABOUT 1/2 MILE E OF BELLEVIEW LANDING, ON PROPERTY OWNED BY
 HV4666'MRS. VICTORIA BEYER, 4601 NICHOLS AVENUE, SE.  THE STATION
 HV4666'IS ON THE BARE WESTERLY SLOPE OF THE RIDGE ABOUT 100 YARDS
 HV4666'W OF A LARGE FRAME HOUSE.
 HV4666'
 HV4666'SURFACE, UNDERGROUND AND REFERENCE MARKS ARE STANDARD BRONZE
 HV4666'DISKS SET IN CONCRETE.
 HV4666'
 HV4666'REFERENCE MARK NO. 1 IS E OF THE STATION ABOUT 10 FEET NW OF
 HV4666'A 2-FOOT LOCUST TREE.
 HV4666'
 HV4666'REFERENCE MARK NO. 2 IS N OF THE STATION AND ABOUT 30 FEET
 HV4666'S OF AN E AND W WIRE FENCE.
 HV4666'
 HV4666'TO REACH STATION FROM ANACOSTIA GO S ON NICHOLS AVENUE FROM
 HV4666'JUNCTION WITH HIGHWAY 5 FOR 2.7 MILES TO FORKS IN ROAD, TAKE
 HV4666'RIGHT FORK AND GO 0.7 MILE (0.3 MILE BEYOND NAVAL MAGAZINE
 HV4666'ROAD) TURN RIGHT AND GO STRAIGHT AHEAD TO HOUSE, KEEP LEFT
 HV4666'ON ROAD AROUND HOUSE AND PASS THROUGH GATE TO OPEN GROUND.  THE
 HV4666'STATION IS ABOUT 30 YARDS W OF LARGE LOCUST TREE AND ABOUT ON
 HV4666'LINE TO THE MASONIC MEMORIAL IN ALEXANDRIA.
 HV4666'
 HV4666'HEIGHT OF LIGHT ABOVE STATION MARK - 2 METERS.
 HV4666
 HV4666                          STATION RECOVERY (1938)
 HV4666
 HV4666'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4666'STATION MARK RECOVERED.  REFERENCE MARKS NOT SEARCHED FOR.
 HV4666
 HV4666                          STATION RECOVERY (1946)
 HV4666
 HV4666'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (RCB)
 HV4666'STATION RECOVERED AS DESCRIBED IN GOOD CONDITION.  REFERENCE
 HV4666'MARKS WERE LOCATED.  A COMPLETE NEW DESCRIPTION FOLLOWS--THE
 HV4666'STATION IS LOCATED AT OLD FORT GREBLE ON THE POINT OF A RIDGE
 HV4666'JUST BELOW THE BROW OF A HILL.  IT IS ABOUT 200 YARDS NW OF A
 HV4666'GROUP OF RED BRICK APARTMENT BUILDINGS AND 200 YARDS NW OF A
 HV4666'LARGE FRAME HOUSE.  THE MARK IS FLUSH WITH THE GROUND AND THE
 HV4666'DISK IS STAMPED GREBLE 2 1935.  TO REACH THE STATION FROM
 HV4666'ANACOSTIA, GO S ON NICHOLS AVENUE FOR 2.7 MILES FROM THE JUNCTION
 HV4666'WITH HIGHWAY 5 TO A FORKS IN THE STREET.  CONTINUE RIGHT
 HV4666'ON NICHOLS AVENUE FOR 0.7 MILE TO A LARGE WHITE HOUSE ON THE
 HV4666'RIGHT.  TURN INTO DRIVE AND GO PAST HOUSE ON TRACK ROAD TO
 HV4666'OPEN GROND ON THE BLUFF OVERLOOKING THE POTOMAC AND THE
 HV4666'STATION ON LINE WITH A LARGE LOCUST TREE AND THE MASONIC
 HV4666'MEMORIAL IN ALEXANDRIA.
 HV4666
 HV4666                          STATION RECOVERY (1958)
 HV4666
 HV4666'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV4666'THE STATION MARKS AND REFERENCE MARKS NOS, 1 AND 2 WERE RECOVERED
 HV4666'IN GOOD CONDITION.  THE 1935 DESCRIPTION BY J.H.B. WILL BE
 HV4666'ADEQUATE AND COMPLETE WITH THE ADDITION OF A NEW TO REACH.
 HV4666'
 HV4666'TO REACH STATION FROM S. CAPITOL STREET BRIDGE, GO SOUTH
 HV4666'ON SOUTH CAPITOL STREET TO CHESAPEAKE STREET, TURN LEFT AND
 HV4666'GO EAST TO NICHOLS AVENUE, TURN RIGHT AND GO TO ELMIRA, TURN
 HV4666'RIGHT AND GO TO END OF STREET, AND TO PLAYGROUND.  CONTINUE
 HV4666'ON THROUGH A GATE AND ACROSS PLAYGROUND IN A SOUTH WESTERLY
 HV4666'DIRECTION TO A WOODS AND THE CREST OF THE HILL.  THE STATION
 HV4666'IS APPROXIMATELY 150 FEET BEYOND THE CREST AND 100 FEET WEST
 HV4666'OF A STONE OUTDOOR FIREPLACE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1874 ***********************************************************************
 HV1874  DESIGNATION -  H 1
 HV1874  PID         -  HV1874
 HV1874  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1874  COUNTRY     -  US
 HV1874  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1874
 HV1874                         *CURRENT SURVEY CONTROL
 HV1874  ______________________________________________________________________
 HV1874* NAD 83(1986) POSITION- 38 54 13.     (N) 077 04 06.     (W)   SCALED
 HV1874* NAVD 88 ORTHO HEIGHT -     4.812 (meters)       15.79  (feet) POSTED
 HV1874  ______________________________________________________________________
 HV1874  GEOID HEIGHT    -        -32.020 (meters)                     GEOID18
 HV1874  DYNAMIC HEIGHT  -          4.81  (meters)       15.8   (feet) COMP
 HV1874  MODELED GRAVITY -    980,092.3   (mgal)                       NAVD 88
 HV1874
 HV1874  VERT ORDER      -  * POSTED, SEE BELOW
 HV1874
 HV1874.The horizontal coordinates were scaled from a map and have
 HV1874.an estimated accuracy of +/- 6 seconds.
 HV1874
 HV1874.The orthometric height was determined by differential leveling
 HV1874.and adjusted by the NATIONAL GEODETIC SURVEY in 1992.
 HV1874
 HV1874.* This is a POSTED BENCH MARK height.
 HV1874
 HV1874.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1874.GEOID18 height accuracy estimate available here.
 HV1874
 HV1874.Click photographs - Photos may exist for this station.
 HV1874
 HV1874.The dynamic height is computed by dividing the NAVD 88
 HV1874.geopotential number by the normal gravity value computed on the
 HV1874.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1874.degrees latitude (g = 980.6199 gals.).
 HV1874
 HV1874.The modeled gravity was interpolated from observed gravity values.
 HV1874
 HV1874
 HV1874_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ206081(NAD 83)
 HV1874
 HV1874                          SUPERSEDED SURVEY CONTROL
 HV1874
 HV1874  NGVD 29 (11/26/84)    5.041  (m)           16.54   (f) ADJUSTED    1 2
 HV1874
 HV1874.Superseded values are not recommended for survey control.
 HV1874
 HV1874.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1874.See file dsdata.pdf to determine how the superseded data were derived.
 HV1874
 HV1874_MARKER: DB = BENCH MARK DISK
 HV1874_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1874_SP_SET: PIER
 HV1874_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1874
 HV1874  HISTORY     - Date     Condition        Report By
 HV1874  HISTORY     - 1914     MONUMENTED       CGS
 HV1874  HISTORY     - 1923     MARK NOT FOUND   CGS
 HV1874  HISTORY     - 1947     GOOD             CGS
 HV1874
 HV1874                          STATION DESCRIPTION
 HV1874
 HV1874'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1874'AT WASHINGTON.
 HV1874'AT WASHINGTON, ON K STREET NORTHWEST, AT KEY BRIDGE, AT THE PIER
 HV1874'BETWEEN WATER STREET AND THE NORTH BANK OF POTOMAC RIVER, IN
 HV1874'THE TOP OF THE BASE OF THE PIER, EAST OF THE WEST LEG, 12 FEET
 HV1874'EAST OF THE NORTHWEST CORNER OF THE PIER, AND LEVEL WITH K
 HV1874'STREET.  A STANDARD DISK.  NOTE-- IT WAS REPORTED IN DECEMBER
 HV1874'1940 THAT THE MARK IS NOW INACCESSIBLE DUE TO THE FACT THAT A
 HV1874'TEMPORARY RUNWAY HAS BEEN BUILT OVER IT.  THE PLANKING HAS BEEN
 HV1874'REMOVED SO THAT THE DISK IS VISIBLE, BUT A LARGE GAS MAIN
 HV1874'EXTENDS FROM THE GROUND DIAGONALLY UPWARD OVER THE MARK SO THAT
 HV1874'A ROD COULD NOT BE HELD PLUMP ON IT.
 HV1874
 HV1874                          STATION RECOVERY (1947)
 HV1874
 HV1874'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947
 HV1874'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1406 ***********************************************************************
 HV1406  DESIGNATION -  H 2
 HV1406  PID         -  HV1406
 HV1406  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1406  COUNTRY     -  US
 HV1406  USGS QUAD   -  ANACOSTIA (2016)
 HV1406
 HV1406                         *CURRENT SURVEY CONTROL
 HV1406  ______________________________________________________________________
 HV1406* NAD 83(1986) POSITION- 38 52 27.     (N) 076 59 35.     (W)   SCALED
 HV1406* NAVD 88 ORTHO HEIGHT -     7.826 (meters)       25.68  (feet) ADJUSTED
 HV1406  ______________________________________________________________________
 HV1406  GEOID HEIGHT    -        -32.185 (meters)                     GEOID18
 HV1406  DYNAMIC HEIGHT  -          7.822 (meters)       25.66  (feet) COMP
 HV1406  MODELED GRAVITY -    980,096.0   (mgal)                       NAVD 88
 HV1406
 HV1406  VERT ORDER      -  FIRST     CLASS II
 HV1406
 HV1406.The horizontal coordinates were scaled from a map and have
 HV1406.an estimated accuracy of +/- 6 seconds.
 HV1406
 HV1406.The orthometric height was determined by differential leveling and
 HV1406.adjusted by the NATIONAL GEODETIC SURVEY
 HV1406.in June 1991.
 HV1406
 HV1406.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1406.GEOID18 height accuracy estimate available here.
 HV1406
 HV1406.Click photographs - Photos may exist for this station.
 HV1406
 HV1406.The dynamic height is computed by dividing the NAVD 88
 HV1406.geopotential number by the normal gravity value computed on the
 HV1406.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1406.degrees latitude (g = 980.6199 gals.).
 HV1406
 HV1406.The modeled gravity was interpolated from observed gravity values.
 HV1406
 HV1406
 HV1406_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ271047(NAD 83)
 HV1406
 HV1406                          SUPERSEDED SURVEY CONTROL
 HV1406
 HV1406  NGVD 29 (11/26/84)    8.067  (m)           26.47   (f) ADJUSTED    1 2
 HV1406
 HV1406.Superseded values are not recommended for survey control.
 HV1406
 HV1406.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1406.See file dsdata.pdf to determine how the superseded data were derived.
 HV1406
 HV1406_MARKER: B = BOLT
 HV1406_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1406_SP_SET: BUILDING
 HV1406_STAMPING: H 2
 HV1406_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1406_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1406+SATELLITE: SATELLITE OBSERVATIONS - March 15, 2012
 HV1406
 HV1406  HISTORY     - Date     Condition        Report By
 HV1406  HISTORY     - UNK      MONUMENTED       CGS
 HV1406  HISTORY     - 1923     GOOD             CGS
 HV1406  HISTORY     - 20120315 GOOD             GEOCAC
 HV1406
 HV1406                          STATION DESCRIPTION
 HV1406
 HV1406'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1406'IN WASHINGTON.
 HV1406'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1406'IN THE EAST SIDE OF THE PROOF BUILDING, AND ABOUT 6 PACES SOUTH
 HV1406'OF THE NORTHEAST CORNER OF THE BUILDING.  THE HIGHEST POINT OF
 HV1406'A BARREL-SHAPED KNOB ON THE PROJECTING END OF A BRONZE BOLT,
 HV1406'THE EXPOSED END OF WHICH IS STAMPED H 2.
 HV1406
 HV1406                          STATION RECOVERY (2012)
 HV1406
 HV1406'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV1406'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1870 ***********************************************************************
 HV1870  DESIGNATION -  H 2 X
 HV1870  PID         -  HV1870
 HV1870  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1870  COUNTRY     -  US
 HV1870  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1870
 HV1870                         *CURRENT SURVEY CONTROL
 HV1870  ______________________________________________________________________
 HV1870* NAD 83(1986) POSITION- 38 54 08.     (N) 077 03 43.     (W)   SCALED
 HV1870* NAVD 88 ORTHO HEIGHT -     9.19  (+/-2cm)       30.2   (feet) VERTCON3
 HV1870  ______________________________________________________________________
 HV1870  GEOID HEIGHT    -        -32.031 (meters)                     GEOID18
 HV1870  VERT ORDER      -  ? (See Below)
 HV1870
 HV1870.The horizontal coordinates were scaled from a map and have
 HV1870.an estimated accuracy of +/- 6 seconds.
 HV1870
 HV1870.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1870.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1870
 HV1870.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1870.GEOID18 height accuracy estimate available here.
 HV1870
 HV1870.The vertical order pertains to the NGVD 29 superseded value.
 HV1870
 HV1870.Click photographs - Photos may exist for this station.
 HV1870
 HV1870
 HV1870_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ211079(NAD 83)
 HV1870
 HV1870                          SUPERSEDED SURVEY CONTROL
 HV1870
 HV1870  NGVD 29 (11/26/84)    9.422  (m)           30.91   (f) ADJUSTED       
 HV1870
 HV1870.Superseded values are not recommended for survey control.
 HV1870
 HV1870.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1870.See file dsdata.pdf to determine how the superseded data were derived.
 HV1870
 HV1870_MARKER: DB = BENCH MARK DISK
 HV1870_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1870_SP_SET: BUILDING
 HV1870_STAMPING: H 2 X 1933
 HV1870_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1870
 HV1870  HISTORY     - Date     Condition        Report By
 HV1870  HISTORY     - 1933     MONUMENTED       CGS
 HV1870  HISTORY     - 1947     GOOD             CGS
 HV1870
 HV1870                          STATION DESCRIPTION
 HV1870
 HV1870'DESCRIBED BY COAST AND GEODETIC SURVEY 1933
 HV1870'IN GEORGETOWN.
 HV1870'AT GEORGETOWN, WASHINGTON D.C., ON THE NORTH SIDE OF K STREET
 HV1870'NORTHWEST BETWEEN WISCONSIN AVENUE AND THIRTY-FIRST STREET, ON THE
 HV1870'EAST SIDE OF THE DISTRICT OF COLUMBIA INCINERATOR PLANT, AT THE
 HV1870'LOWER (TRUCK) DOORWAY, IN THE WALL JUST NORTH OF THE DOOR, AND
 HV1870'ABOUT 4 FEET ABOVE THE GROUND.  A STANDARD DISK, STAMPED H 2 X 1933
 HV1870'AND SET VERTICALLY.
 HV1870
 HV1870                          STATION RECOVERY (1947)
 HV1870
 HV1870'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947
 HV1870'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV0875 ***********************************************************************
 HV0875  DESIGNATION -  H 5
 HV0875  PID         -  HV0875
 HV0875  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV0875  COUNTRY     -  US
 HV0875  USGS QUAD   -  ANACOSTIA (2016)
 HV0875
 HV0875                         *CURRENT SURVEY CONTROL
 HV0875  ______________________________________________________________________
 HV0875* NAD 83(1986) POSITION- 38 52 10.3    (N) 076 57 37.8    (W)   HD_HELD2
 HV0875* NAVD 88 ORTHO HEIGHT -    50.444 (meters)      165.50  (feet) ADJUSTED
 HV0875  ______________________________________________________________________
 HV0875  GEOID HEIGHT    -        -32.246 (meters)                     GEOID18
 HV0875  DYNAMIC HEIGHT  -         50.417 (meters)      165.41  (feet) COMP
 HV0875  MODELED GRAVITY -    980,087.4   (mgal)                       NAVD 88
 HV0875
 HV0875  VERT ORDER      -  FIRST     CLASS II
 HV0875
 HV0875.The horizontal coordinates were established by autonomous hand held GPS
 HV0875.observations and have an estimated accuracy of +/- 10 meters.
 HV0875
 HV0875.The orthometric height was determined by differential leveling and
 HV0875.adjusted by the NATIONAL GEODETIC SURVEY
 HV0875.in August 2020.
 HV0875
 HV0875.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV0875.GEOID18 height accuracy estimate available here.
 HV0875
 HV0875.Click photographs - Photos may exist for this station.
 HV0875
 HV0875.The dynamic height is computed by dividing the NAVD 88
 HV0875.geopotential number by the normal gravity value computed on the
 HV0875.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV0875.degrees latitude (g = 980.6199 gals.).
 HV0875
 HV0875.The modeled gravity was interpolated from observed gravity values.
 HV0875
 HV0875
 HV0875_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2991804124(NAD 83)
 HV0875
 HV0875                          SUPERSEDED SURVEY CONTROL
 HV0875
 HV0875  NAVD 88 (06/15/91)   50.441  (m)          165.49   (f) SUPERSEDED  1 1
 HV0875  NGVD 29 (11/26/84)   50.678  (m)          166.27   (f) ADJUSTED    1 1
 HV0875
 HV0875.Superseded values are not recommended for survey control.
 HV0875
 HV0875.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV0875.See file dsdata.pdf to determine how the superseded data were derived.
 HV0875
 HV0875_MARKER: DB = BENCH MARK DISK
 HV0875_SETTING: 16 = (FASTENED TO) A METAL ROD WITH BASE PLATE BURIED/SCREWED
 HV0875+WITH SETTING: INTO GROUND
 HV0875_STAMPING: H 5 1971
 HV0875_MARK LOGO: CGS
 HV0875_PROJECTION: RECESSED 20 CENTIMETERS
 HV0875_MAGNETIC: I = MARKER IS A STEEL ROD
 HV0875_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV0875+STABILITY: SURFACE MOTION
 HV0875_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV0875+SATELLITE: SATELLITE OBSERVATIONS - October 28, 2019
 HV0875
 HV0875  HISTORY     - Date     Condition        Report By
 HV0875  HISTORY     - 1971     MONUMENTED       NGS
 HV0875  HISTORY     - 20191028 GOOD             ARCSHE
 HV0875
 HV0875                          STATION DESCRIPTION
 HV0875
 HV0875'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV0875'AT WASHINGTON.
 HV0875'AT WASHINGTON, D.C., ABOUT 1.0 MILE SOUTHEAST ALONG PENNSYLVANIA
 HV0875'AVENUE FROM THE SOUTHEAST END OF THE JOHN PHILIP SOUSA BRIDGE
 HV0875'OVER THE ANACOSTIA RIVER, ABOUT 0.85 MILE NORTHWEST OF THE
 HV0875'D.C.-MARYLAND BOUNDARY LINE, IN THE NORTHWEST ANGLE OF THE
 HV0875'INTERSECTION OF PENNSYLVANIA AND SE BRANCE AVENUES, 81.9 FEET
 HV0875'SOUTHEAST OF THE SOUTHEAST CORNER OF THE BOTTOM STEP FOR THE
 HV0875'PORCH ON THE SECOND CHURCH OF CHRIST SCIENTIST BUILDING, 37.3
 HV0875'FEET NORTHEAST OF THE NORTHEAST CURB OF PENNSYLVANIA AVENUE,
 HV0875'2.7 FEET WEST OF THE WEST CURB OF SE BRANCH AVENUE, 3.4 FEET EAST
 HV0875'OF THE EAST EDGE OF THE SIDEWALK ON THE WEST SIDE OF SE BRANCE
 HV0875'AVENUE, 1 1/2 FEET SOUTH OF A BRACE POLE FOR A POWER POLE, AND ON
 HV0875'TOP OF A 4-FOOT SECTION OF COPPER COATED ROAD THAT IS ATTACHED
 HV0875'TO A METAL BASE PLATE.  THS DISK IS 1 INCH BELOW THE SURFACE
 HV0875'OF THE GROUND AND IS PROTECTED BY A 6-INCH METAL PIPE WHICH IS
 HV0875'LEVEL WITH THE SURFACE OF THE GROUND.
 HV0875
 HV0875                          STATION RECOVERY (2019)
 HV0875
 HV0875'RECOVERY NOTE BY ARCHER-SHEE LAND SURVEYING 2019 (MRA)
 HV0875'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4670 ***********************************************************************
 HV4670  DESIGNATION -  H USE 1913
 HV4670  PID         -  HV4670
 HV4670  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4670  COUNTRY     -  US
 HV4670  USGS QUAD   -  ALEXANDRIA (2019)
 HV4670
 HV4670                         *CURRENT SURVEY CONTROL
 HV4670  ______________________________________________________________________
 HV4670* NAD 83(1993) POSITION- 38 51 42.05700(N) 077 01 06.98812(W)   ADJUSTED
 HV4670* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV4670  ______________________________________________________________________
 HV4670  GEOID HEIGHT    -        -32.165 (meters)                     GEOID18
 HV4670  LAPLACE CORR    -         -2.98  (seconds)                    DEFLEC18
 HV4670  HORZ ORDER      -  THIRD
 HV4670
 HV4670.The horizontal coordinates were established by classical geodetic methods
 HV4670.and adjusted by the National Geodetic Survey in November 1994.
 HV4670
 HV4670.The orthometric height was scaled from a topographic map.
 HV4670
 HV4670.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4670.GEOID18 height accuracy estimate available here.
 HV4670
 HV4670.Click photographs - Photos may exist for this station.
 HV4670
 HV4670.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4670
 HV4670. The following values were computed from the NAD 83(1993) position.
 HV4670
 HV4670;                    North         East     Units Scale Factor Converg.
 HV4670;SPC MD       -   132,651.931   398,385.020   MT  0.99994988   -0 00 42.0
 HV4670;SPC MD       -   435,208.88  1,307,034.85   sFT  0.99994988   -0 00 42.0
 HV4670;SPC VA N     - 2,133,683.920 3,628,566.101   MT  0.99995744   +0 55 28.4
 HV4670;SPC VA N     - 7,000,261.33 11,904,720.62   sFT  0.99995744   +0 55 28.4
 HV4670;UTM  18      - 4,303,363.788   324,857.613   MT  0.99997774   -1 16 00.8
 HV4670
 HV4670!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4670!SPC MD       -   1.00000493  x   0.99994988  =   0.99995481
 HV4670!SPC VA N     -   1.00000493  x   0.99995744  =   0.99996237
 HV4670!UTM  18      -   1.00000493  x   0.99997774  =   0.99998267
 HV4670
 HV4670:                Primary Azimuth Mark                     Grid Az
 HV4670:SPC MD       -  POTOMAC PARK SOUTHEAST BASE              211 22 30.5
 HV4670:SPC VA N     -  POTOMAC PARK SOUTHEAST BASE              210 26 20.1
 HV4670:UTM  18      -  POTOMAC PARK SOUTHEAST BASE              212 37 49.3
 HV4670
 HV4670_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2485703363(NAD 83)
 HV4670
 HV4670|---------------------------------------------------------------------|
 HV4670| PID    Reference Object                     Distance      Geod. Az  |
 HV4670|                                                           dddmmss.s |
 HV4670| HV4764 POTOMAC PARK SOUTHEAST BASE         APPROX. 0.6 KM 2112148.5 |
 HV4670|---------------------------------------------------------------------|
 HV4670
 HV4670                          SUPERSEDED SURVEY CONTROL
 HV4670
 HV4670  NAD 83(1991)-  38 51 42.05558(N)    077 01 06.98941(W) AD(       ) 3
 HV4670  NAD 83(1986)-  38 51 42.05521(N)    077 01 07.00047(W) AD(       ) 3
 HV4670  NAD 27      -  38 51 41.65400(N)    077 01 08.08300(W) AD(       ) 3
 HV4670  USSD        -  38 51 41.99100(N)    077 01 07.91300(W) AD(       ) 3
 HV4670
 HV4670.Superseded values are not recommended for survey control.
 HV4670
 HV4670.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4670.See file dsdata.pdf to determine how the superseded data were derived.
 HV4670
 HV4670_MARKER: Z = SEE DESCRIPTION
 HV4670_SETTING: 0 = UNSPECIFIED SETTING
 HV4670_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4670
 HV4670  HISTORY     - Date     Condition        Report By
 HV4670  HISTORY     - 1913     MONUMENTED       USACE
 HV4670  HISTORY     - 1940     MARK NOT FOUND   CGS
 HV4670  HISTORY     - 1958     MARK NOT FOUND   CGS
 HV4670
 HV4670                          STATION DESCRIPTION
 HV4670
 HV4670'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1913 (OBF)
 HV4670'STATION IS A CONCRETE BLOCK 6 INCHES IN DIAMETER, AND 1 OR 2
 HV4670'INCHES OUT OF GROUND.  ABOUT 5 METERS FROM SEA WALL AND SOME
 HV4670'50 METERS FROM S END OF THE GROUNDS AT ARSENAL AND NEAR W SIDE
 HV4670'OF GROUNDS.
 HV4670
 HV4670                          STATION RECOVERY (1940)
 HV4670
 HV4670'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV4670'STATION IS LOST.  THE U.S. ENGINEERS REPORT THAT THIS MARK WAS
 HV4670'RECOVERED IN 1914, BUT SINCE THEN IT HAS BEEN COVERED OVER.
 HV4670
 HV4670                          STATION RECOVERY (1958)
 HV4670
 HV4670'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV4670'DUE TO THE LACK OF A DESCRIPTION THE STATION IS NOT RECOVERABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7667 ***********************************************************************
 HV7667  DESIGNATION -  H USE 1931
 HV7667  PID         -  HV7667
 HV7667  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7667  COUNTRY     -  US
 HV7667  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7667
 HV7667                         *CURRENT SURVEY CONTROL
 HV7667  ______________________________________________________________________
 HV7667* NAD 83(1993) POSITION- 38 55 00.79211(N) 076 57 01.17040(W)   ADJUSTED
 HV7667* NAVD 88 ORTHO HEIGHT -    17.2   (meters)       56.    (feet) VERTCON3
 HV7667  ______________________________________________________________________
 HV7667  GEOID HEIGHT    -        -32.198 (meters)                     GEOID18
 HV7667  LAPLACE CORR    -         -4.60  (seconds)                    DEFLEC18
 HV7667  HORZ ORDER      -  THIRD
 HV7667
 HV7667.The horizontal coordinates were established by classical geodetic methods
 HV7667.and adjusted by the National Geodetic Survey in November 1994.
 HV7667
 HV7667.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV7667.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV7667
 HV7667.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7667.GEOID18 height accuracy estimate available here.
 HV7667
 HV7667.Click photographs - Photos may exist for this station.
 HV7667
 HV7667.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7667
 HV7667. The following values were computed from the NAD 83(1993) position.
 HV7667
 HV7667;                    North         East     Units Scale Factor Converg.
 HV7667;SPC MD       -   138,781.035   404,307.972   MT  0.99995010   +0 01 52.2
 HV7667;SPC MD       -   455,317.45  1,326,467.07   sFT  0.99995010   +0 01 52.2
 HV7667;SPC VA N     - 2,139,909.034 3,634,388.184   MT  0.99996200   +0 58 01.8
 HV7667;SPC VA N     - 7,020,684.89 11,923,821.90   sFT  0.99996200   +0 58 01.8
 HV7667;UTM  18      - 4,309,361.688   330,913.573   MT  0.99995206   -1 13 31.7
 HV7667
 HV7667!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7667!SPC MD       -   1.00000236  x   0.99995010  =   0.99995246
 HV7667!SPC VA N     -   1.00000236  x   0.99996200  =   0.99996436
 HV7667!UTM  18      -   1.00000236  x   0.99995206  =   0.99995442
 HV7667
 HV7667:                Primary Azimuth Mark                     Grid Az
 HV7667:SPC MD       -  P USE 1931                               138 24 54.4
 HV7667:SPC VA N     -  P USE 1931                               137 28 44.8
 HV7667:UTM  18      -  P USE 1931                               139 40 18.3
 HV7667
 HV7667_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3091309361(NAD 83)
 HV7667
 HV7667|---------------------------------------------------------------------|
 HV7667| PID    Reference Object                     Distance      Geod. Az  |
 HV7667|                                                           dddmmss.s |
 HV7667| HV7657 P USE 1931                          APPROX. 1.1 KM 1382646.6 |
 HV7667|---------------------------------------------------------------------|
 HV7667
 HV7667                          SUPERSEDED SURVEY CONTROL
 HV7667
 HV7667  NAD 83(1991)-  38 55 00.79090(N)    076 57 01.17147(W) AD(       ) 3
 HV7667  NAD 83(1986)-  38 55 00.78994(N)    076 57 01.18242(W) AD(       ) 3
 HV7667  NAD 27      -  38 55 00.38100(N)    076 57 02.28500(W) AD(       ) 3
 HV7667  NGVD 29 (07/19/86)   17.4    (m)           57.     (f) VERT ANG       
 HV7667
 HV7667.Superseded values are not recommended for survey control.
 HV7667
 HV7667.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7667.See file dsdata.pdf to determine how the superseded data were derived.
 HV7667
 HV7667
 HV7667  HISTORY     - Date     Condition        Report By
 HV7667  HISTORY     - 1931     MONUMENTED       CGS
 HV7667  HISTORY     - 1958     MARK NOT FOUND   CGS
 HV7667
 HV7667                          STATION DESCRIPTION
 HV7667
 HV7667'DESCRIBED BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7667'DUE TO THE LACK OF DESCRIPTION, THE STATION IS NOT RECOVERABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9833 ***********************************************************************
 HV9833  DESIGNATION -  HAGGINS GPS E808
 HV9833  PID         -  HV9833
 HV9833  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9833  COUNTRY     -  US
 HV9833  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9833
 HV9833                         *CURRENT SURVEY CONTROL
 HV9833  ______________________________________________________________________
 HV9833* NAD 83(2011) POSITION- 38 55 01.56092(N) 077 01 40.60304(W)   ADJUSTED
 HV9833* NAD 83(2011) ELLIP HT-    -3.418 (meters)        (06/27/12)   ADJUSTED
 HV9833* NAD 83(2011) EPOCH   -  2010.00
 HV9833* NAVD 88 ORTHO HEIGHT -    28.6   (meters)       94.    (feet) VERTCON3
 HV9833  ______________________________________________________________________
 HV9833  GEOID HEIGHT    -        -32.044 (meters)                     GEOID18
 HV9833  NAD 83(2011) X  -  1,115,445.166 (meters)                     COMP
 HV9833  NAD 83(2011) Y  - -4,842,297.817 (meters)                     COMP
 HV9833  NAD 83(2011) Z  -  3,985,158.544 (meters)                     COMP
 HV9833  LAPLACE CORR    -         -2.31  (seconds)                    DEFLEC18
 HV9833
 HV9833  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV9833  Standards:
 HV9833         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV9833            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV9833  -------------------------------------------------------------------
 HV9833  NETWORK    1.01   1.80           0.44   0.38   0.92      0.13104301
 HV9833  -------------------------------------------------------------------
 HV9833  Click here for local accuracies and other accuracy information.
 HV9833
 HV9833.The horizontal coordinates were established by GPS observations
 HV9833.and adjusted by the National Geodetic Survey in June 2012.
 HV9833
 HV9833.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV9833.been affixed to the stable North American tectonic plate. See 
 HV9833.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV9833
 HV9833.The horizontal coordinates are valid at the epoch date displayed above
 HV9833.which is a decimal equivalence of Year/Month/Day.
 HV9833
 HV9833.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV9833.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV9833
 HV9833.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9833.GEOID18 height accuracy estimate available here.
 HV9833
 HV9833.Click photographs - Photos may exist for this station.
 HV9833
 HV9833.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV9833
 HV9833.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9833
 HV9833.The ellipsoidal height was determined by GPS observations
 HV9833.and is referenced to NAD 83.
 HV9833
 HV9833. The following values were computed from the NAD 83(2011) position.
 HV9833
 HV9833;                    North         East     Units Scale Factor Converg.
 HV9833;SPC MD       -   138,803.941   397,576.499   MT  0.99995011   -0 01 03.1
 HV9833;SPC MD       -   455,392.60  1,304,382.23   sFT  0.99995011   -0 01 03.1
 HV9833;SPC VA N     - 2,139,821.957 3,627,657.155   MT  0.99996202   +0 55 07.4
 HV9833;SPC VA N     - 7,020,399.20 11,901,738.52   sFT  0.99996202   +0 55 07.4
 HV9833;UTM  18      - 4,309,532.223   324,184.113   MT  0.99998064   -1 16 27.4
 HV9833
 HV9833!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9833!SPC MD       -   1.00000054  x   0.99995011  =   0.99995065
 HV9833!SPC VA N     -   1.00000054  x   0.99996202  =   0.99996256
 HV9833!UTM  18      -   1.00000054  x   0.99998064  =   0.99998118
 HV9833
 HV9833_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2418409532(NAD 83)
 HV9833
 HV9833|---------------------------------------------------------------------|
 HV9833| PID    Reference Object                     Distance      Geod. Az  |
 HV9833|                                                           dddmmss.s |
 HV9833| HV9832 FOX GPS E809                        332.308 METERS 27006     |
 HV9833|---------------------------------------------------------------------|
 HV9833
 HV9833                          SUPERSEDED SURVEY CONTROL
 HV9833
 HV9833  NAD 83(2007)-  38 55 01.56156(N)    077 01 40.60385(W) AD(2002.00) 0
 HV9833  ELLIP H (02/10/07)   -3.406  (m)                       GP(2002.00)    
 HV9833  ELLIP H (08/30/02)   -3.410  (m)                       GP(       ) 4 2
 HV9833  NAD 83(1993)-  38 55 01.56198(N)    077 01 40.60368(W) AD(       ) 1
 HV9833  ELLIP H (11/14/94)   -3.414  (m)                       GP(       ) 4 2
 HV9833  NAD 83(1991)-  38 55 01.56143(N)    077 01 40.60380(W) AD(       ) 1
 HV9833  NGVD 29 (11/30/93)   28.9    (m)  GEOID93  model used  GPS OBS        
 HV9833
 HV9833.Superseded values are not recommended for survey control.
 HV9833
 HV9833.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9833.See file dsdata.pdf to determine how the superseded data were derived.
 HV9833
 HV9833_MARKER: DD = SURVEY DISK
 HV9833_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV9833_SP_SET: FLUSH IN SIDEWALK
 HV9833_STAMPING: HAGGINS GPS E808 9-92
 HV9833_MARK LOGO: DEWDAV
 HV9833_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9833_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9833_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV9833+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9833
 HV9833  HISTORY     - Date     Condition        Report By
 HV9833  HISTORY     - 1992     MONUMENTED       DEWDAV
 HV9833
 HV9833                          STATION DESCRIPTION
 HV9833
 HV9833'DESCRIBED BY DEWBERRY DAVIS 1992
 HV9833'STATION IS LOCATED IN DOWNTOWN WASHINGTON, DISTRICT OF COLUMBIA.
 HV9833'TO REACH STATION, PROCEED TO THE INTERSECTION OF U STREET NORTHWEST
 HV9833'AND 12TH STREET NORTHWEST. STATION IS 2.5 INCH DIAMETER BRASS SURVEY
 HV9833'DISK SET IN SIDEWALK IN NORTHEAST QUADRANT OF SAID INTERSECTION NEAR
 HV9833'VACANT LOT WITH SIX-FOOT HIGH CHAIN LINK FENCE.
 HV9833'STATION IS 441.034 FT (134.427 M) EAST OF REFERENCE DISK C AT
 HV9833'NORTHEAST CORNER OF 13TH AND U STREETS, 634.524 FT (193.403 M) NORTH
 HV9833'OF REFERENCE DISK B ON 12TH STREET, 348.644 FT (106.267 M) SOUTH OF
 HV9833'REFERENCE DISK A ON 12TH STREET AND 1090.2514 FT (332.3093 M) ON
 HV9833'BEARING NORTH 89-52-29 WEST FROM STATION FOX GPS E809.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8288 ***********************************************************************
 HV8288  DESIGNATION -  HAMPSHIRE GPS E20
 HV8288  PID         -  HV8288
 HV8288  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8288  COUNTRY     -  US
 HV8288  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8288
 HV8288                         *CURRENT SURVEY CONTROL
 HV8288  ______________________________________________________________________
 HV8288* NAD 83(2011) POSITION- 38 57 39.93996(N) 077 00 20.59082(W)   ADJUSTED
 HV8288* NAD 83(2011) ELLIP HT-    45.638 (meters)        (06/27/12)   ADJUSTED
 HV8288* NAD 83(2011) EPOCH   -  2010.00
 HV8288* NAVD 88 ORTHO HEIGHT -    77.7   (meters)      255.    (feet) VERTCON3
 HV8288  ______________________________________________________________________
 HV8288  GEOID HEIGHT    -        -32.023 (meters)                     GEOID18
 HV8288  NAD 83(2011) X  -  1,116,641.835 (meters)                     COMP
 HV8288  NAD 83(2011) Y  - -4,838,910.979 (meters)                     COMP
 HV8288  NAD 83(2011) Z  -  3,988,988.221 (meters)                     COMP
 HV8288  LAPLACE CORR    -         -2.82  (seconds)                    DEFLEC18
 HV8288
 HV8288  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV8288  Standards:
 HV8288         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV8288            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV8288  -------------------------------------------------------------------
 HV8288  NETWORK    0.98   1.84           0.43   0.37   0.94      0.04058703
 HV8288  -------------------------------------------------------------------
 HV8288  Click here for local accuracies and other accuracy information.
 HV8288
 HV8288.The horizontal coordinates were established by GPS observations
 HV8288.and adjusted by the National Geodetic Survey in June 2012.
 HV8288
 HV8288.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV8288.been affixed to the stable North American tectonic plate. See 
 HV8288.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV8288
 HV8288.The horizontal coordinates are valid at the epoch date displayed above
 HV8288.which is a decimal equivalence of Year/Month/Day.
 HV8288
 HV8288.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV8288.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV8288
 HV8288.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8288.GEOID18 height accuracy estimate available here.
 HV8288
 HV8288.Click photographs - Photos may exist for this station.
 HV8288
 HV8288.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV8288
 HV8288.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV8288
 HV8288.The ellipsoidal height was determined by GPS observations
 HV8288.and is referenced to NAD 83.
 HV8288
 HV8288. The following values were computed from the NAD 83(2011) position.
 HV8288
 HV8288;                    North         East     Units Scale Factor Converg.
 HV8288;SPC MD       -   143,687.327   399,504.278   MT  0.99995095   -0 00 12.9
 HV8288;SPC MD       -   471,414.17  1,310,706.95   sFT  0.99995095   -0 00 12.9
 HV8288;SPC VA N     - 2,144,736.258 3,629,504.910   MT  0.99996632   +0 55 57.4
 HV8288;SPC VA N     - 7,036,522.21 11,907,800.69   sFT  0.99996632   +0 55 57.4
 HV8288;UTM  18      - 4,314,372.258   326,218.635   MT  0.99997188   -1 15 41.4
 HV8288
 HV8288!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV8288!SPC MD       -   0.99999284  x   0.99995095  =   0.99994379
 HV8288!SPC VA N     -   0.99999284  x   0.99996632  =   0.99995916
 HV8288!UTM  18      -   0.99999284  x   0.99997188  =   0.99996472
 HV8288
 HV8288_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2621814372(NAD 83)
 HV8288
 HV8288                          SUPERSEDED SURVEY CONTROL
 HV8288
 HV8288  NAD 83(2007)-  38 57 39.94057(N)    077 00 20.59163(W) AD(2002.00) 0
 HV8288  ELLIP H (02/10/07)   45.650  (m)                       GP(2002.00)    
 HV8288  ELLIP H (08/30/02)   45.642  (m)                       GP(       ) 4 2
 HV8288  NAD 83(1993)-  38 57 39.94105(N)    077 00 20.59132(W) AD(       ) 1
 HV8288  ELLIP H (11/14/94)   45.636  (m)                       GP(       ) 4 2
 HV8288  NAD 83(1991)-  38 57 39.94053(N)    077 00 20.59120(W) AD(       ) 1
 HV8288  NAD 83(1986)-  38 57 39.93919(N)    077 00 20.60197(W) AD(       ) 1
 HV8288  NGVD 29 (05/23/89)   77.9    (m)  RAPSU86  model used  GPS OBS        
 HV8288
 HV8288.Superseded values are not recommended for survey control.
 HV8288
 HV8288.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8288.See file dsdata.pdf to determine how the superseded data were derived.
 HV8288
 HV8288_MARKER: A = ALUMINUM MARKER
 HV8288_SETTING: 15 = METAL ROD DRIVEN INTO GROUND. SEE TEXT FOR ADDITIONAL
 HV8288+WITH SETTING: INFORMATION.
 HV8288_STAMPING: HAMPSHIRE GPS E-20
 HV8288_MARK LOGO: DEWDAV
 HV8288_MAGNETIC: B = BAR MAGNET IMBEDDED IN MONUMENT
 HV8288_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV8288+STABILITY: SURFACE MOTION
 HV8288_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV8288+SATELLITE: SATELLITE OBSERVATIONS - May 03, 2008
 HV8288
 HV8288  HISTORY     - Date     Condition        Report By
 HV8288  HISTORY     - 1988     MONUMENTED       DEWDAV
 HV8288  HISTORY     - 19920710 GOOD             NOS
 HV8288  HISTORY     - 19920920 GOOD             HOBBS
 HV8288  HISTORY     - 19960817 GOOD             DMW
 HV8288  HISTORY     - 20001001 GOOD             NGS
 HV8288  HISTORY     - 20080503 GOOD             NGS
 HV8288
 HV8288                          STATION DESCRIPTION
 HV8288
 HV8288'DESCRIBED BY DEWBERRY DAVIS 1988
 HV8288'THE STATION IS LOCATED IN THE DISTRICT OF COLUMBIA NEAR THE NORTHEAST
 HV8288'BOUNDARY WITH MARYLAND.
 HV8288'TO REACH STATION FROM THE INTERSECTION OF N. CAPITAL STREET AND NEW
 HV8288'HAMPSHIRE AVENUE, GO NE ON NEW HAMPSHIRE AVENUE FOR 0.35 MILE TO THE
 HV8288'STATION ON RIGHT.  THE STATION IS ON THE EAST SIDE OF NEW HAMPSHIRE
 HV8288'AVENUE NORTH OF THE BRIDGE OVER THE METRO TRACKS.  THE STATION IS 10
 HV8288'FEET EAST OF THE EAST EDGE OF THE CURB ALONG THE EAST SIDE OF NEW
 HV8288'HAMPSHIRE AVENUE AND 54 FEET SOUTH OF THE END OF CURB AT THE SOUTH
 HV8288'CORNER OF NEW HAMPSHIRE AVENUE AND OGELTHORPE STREET.
 HV8288'THE STATION MARK IS A 2.5 INCH ALUMINUM DISK STAMPED ---HAMPSHIRE GPS
 HV8288'E-20---FIXED TO THE TOP OF A BERNSTEN 3-D MONUMENT, SET IN A 5 INCH
 HV8288'ALUMINUM MONUMENT BOX AND RECESSED 8 INCHES BELOW GROUND.  IT IS 10.75
 HV8288'FEET SW OF A SCRIBE MARK IN THE CURB,  81.02 FEET NW FROM THE
 HV8288'NORTHERLY END OF THE BRIDGE ABUTMENT WALL, AND  54.07 SW FEET FROM A
 HV8288'SCRIBE MARK IN THE END OF THE CURB ALONG THE SOUTH SIDE IF THE CORNER
 HV8288'OF NEW HAMPSHIRE AVENUE AND OGLETHORPE STREET.
 HV8288
 HV8288                          STATION RECOVERY (1992)
 HV8288
 HV8288'RECOVERY NOTE BY NATIONAL OCEAN SERVICE 1992
 HV8288'RECOVERED IN GOOD CONDITION.
 HV8288
 HV8288                          STATION RECOVERY (1992)
 HV8288
 HV8288'RECOVERY NOTE BY HOBBS AND ASSOCIATES 1992
 HV8288'RECOVERED IN GOOD CONDITION.
 HV8288
 HV8288                          STATION RECOVERY (1996)
 HV8288
 HV8288'RECOVERY NOTE BY DAFT MCCUNE WALKER INCORPORATED 1996 (DMM)
 HV8288'RECOVERED AS DESCRIBED.
 HV8288
 HV8288                          STATION RECOVERY (2000)
 HV8288
 HV8288'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2000 (CSM)
 HV8288'RECOVERED AS DESCRIBED.
 HV8288
 HV8288                          STATION RECOVERY (2008)
 HV8288
 HV8288'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DRD)
 HV8288'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4253 ***********************************************************************
 HV4253  DESIGNATION -  HB 1913
 HV4253  PID         -  HV4253
 HV4253  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4253  COUNTRY     -  US
 HV4253  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4253
 HV4253                         *CURRENT SURVEY CONTROL
 HV4253  ______________________________________________________________________
 HV4253* NAD 83(1993) POSITION- 38 52 48.90000(N) 077 02 31.03696(W)   ADJUSTED
 HV4253* NAVD 88 ORTHO HEIGHT -     3.    (meters)       10.    (feet) SCALED
 HV4253  ______________________________________________________________________
 HV4253  GEOID HEIGHT    -        -32.097 (meters)                     GEOID18
 HV4253  LAPLACE CORR    -         -2.67  (seconds)                    DEFLEC18
 HV4253  HORZ ORDER      -  THIRD
 HV4253
 HV4253.The horizontal coordinates were established by classical geodetic methods
 HV4253.and adjusted by the National Geodetic Survey in November 1994.
 HV4253
 HV4253.The orthometric height was scaled from a topographic map.
 HV4253
 HV4253.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4253.GEOID18 height accuracy estimate available here.
 HV4253
 HV4253.Click photographs - Photos may exist for this station.
 HV4253
 HV4253.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4253
 HV4253. The following values were computed from the NAD 83(1993) position.
 HV4253
 HV4253;                    North         East     Units Scale Factor Converg.
 HV4253;SPC MD       -   134,713.733   396,359.679   MT  0.99994985   -0 01 34.8
 HV4253;SPC MD       -   441,973.31  1,300,390.05   sFT  0.99994985   -0 01 34.8
 HV4253;SPC VA N     - 2,135,712.369 3,626,507.323   MT  0.99995887   +0 54 36.0
 HV4253;SPC VA N     - 7,006,916.33 11,897,966.11   sFT  0.99995887   +0 54 36.0
 HV4253;UTM  18      - 4,305,469.540   322,877.869   MT  0.99998632   -1 16 55.4
 HV4253
 HV4253!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4253!SPC MD       -   1.00000460  x   0.99994985  =   0.99995445
 HV4253!SPC VA N     -   1.00000460  x   0.99995887  =   0.99996347
 HV4253!UTM  18      -   1.00000460  x   0.99998632  =   0.99999092
 HV4253
 HV4253:                Primary Azimuth Mark                     Grid Az
 HV4253:SPC MD       -  P                                        221 34 52.5
 HV4253:SPC VA N     -  P                                        220 38 41.7
 HV4253:UTM  18      -  P                                        222 50 13.1
 HV4253
 HV4253_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2287705469(NAD 83)
 HV4253
 HV4253|---------------------------------------------------------------------|
 HV4253| PID    Reference Object                     Distance      Geod. Az  |
 HV4253|                                                           dddmmss.s |
 HV4253| HV4438 TB 1913                             244.839 METERS 12523     |
 HV4253| HV4256 P                                   APPROX. 0.6 KM 2213317.7 |
 HV4253| HV4055 GB 1913                             316.056 METERS 31016     |
 HV4253|---------------------------------------------------------------------|
 HV4253
 HV4253                          SUPERSEDED SURVEY CONTROL
 HV4253
 HV4253  NAD 83(1991)-  38 52 48.89870(N)    077 02 31.03842(W) AD(       ) 3
 HV4253  NAD 83(1986)-  38 52 48.89845(N)    077 02 31.04911(W) AD(       ) 3
 HV4253  NAD 27      -  38 52 48.49900(N)    077 02 32.12600(W) AD(       ) 3
 HV4253  USSD        -  38 52 48.83700(N)    077 02 31.95700(W) AD(       ) 3
 HV4253
 HV4253.Superseded values are not recommended for survey control.
 HV4253
 HV4253.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4253.See file dsdata.pdf to determine how the superseded data were derived.
 HV4253
 HV4253_MARKER: I = METAL ROD
 HV4253_SETTING: 0 = UNSPECIFIED SETTING
 HV4253_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4253
 HV4253  HISTORY     - Date     Condition        Report By
 HV4253  HISTORY     - 1913     MONUMENTED       CGS
 HV4253  HISTORY     - 1940     MARK NOT FOUND   CGS
 HV4253
 HV4253                          STATION DESCRIPTION
 HV4253
 HV4253'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4253'STATION IS IN CONCRETE MONUMENT, 8-INCH CAST-IRON PIPE CENTERED
 HV4253'WITH 1/4-INCH BRASS ROD, 0.1 FOOT ABOVE GROUND ABOUT 6 FEET
 HV4253'ABOVE MEAN LOW WATER, 6.7 FEET NE OF EDGE OF WALL, 15 FEET
 HV4253'SW OF THREE-FORKED WILLOW TREE, 18-INCH, 19-INCH AND
 HV4253'24-INCH DIAMETER.
 HV4253
 HV4253                          STATION RECOVERY (1940)
 HV4253
 HV4253'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV4253'STATION IS PROBABLY LOST.  CHANGES HAVE TAKEN PLACE WHICH
 HV4253'MAKE THE ORIGINAL DESCRIPTION INADEQUATE.  A BRIEF SEARCH
 HV4253'INDICATED THAT THE MARK HAS PROBABLY BEEN WASHED OUT.  IF A
 HV4253'RECOVERY IS POSSIBLE, WHICH SEEMS DOUBTFUL, IT WILL HAVE TO
 HV4253'BE MADE BY AN AZIMUTH AND DISTANCE FROM A NEARBY STATION,
 HV4253'BUT SINCE THE U.S.E., WHO ESTABLISHED THIS STATION, NO LONGER
 HV4253'USE IT, AND ESTABLISHED ANOTHER STATION NEARBY IN 1932,
 HV4253'THE OLD STATION IS PROBABLY GONE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4136 ***********************************************************************
 HV4136  DESIGNATION -  HERALD WSSD 1933
 HV4136  PID         -  HV4136
 HV4136  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4136  COUNTRY     -  US
 HV4136  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4136
 HV4136                         *CURRENT SURVEY CONTROL
 HV4136  ______________________________________________________________________
 HV4136* NAD 83(1993) POSITION- 38 58 26.79962(N) 077 00 49.14518(W)   ADJUSTED
 HV4136* NAVD 88 ORTHO HEIGHT -    87.    (meters)      285.    (feet) SCALED
 HV4136  ______________________________________________________________________
 HV4136  GEOID HEIGHT    -        -32.004 (meters)                     GEOID18
 HV4136  LAPLACE CORR    -         -2.85  (seconds)                    DEFLEC18
 HV4136  HORZ ORDER      -  THIRD
 HV4136
 HV4136.The horizontal coordinates were established by classical geodetic methods
 HV4136.and adjusted by the National Geodetic Survey in November 1994.
 HV4136
 HV4136.The orthometric height was scaled from a topographic map.
 HV4136
 HV4136.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4136.GEOID18 height accuracy estimate available here.
 HV4136
 HV4136.Click photographs - Photos may exist for this station.
 HV4136
 HV4136.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4136
 HV4136. The following values were computed from the NAD 83(1993) position.
 HV4136
 HV4136;                    North         East     Units Scale Factor Converg.
 HV4136;SPC MD       -   145,132.362   398,817.052   MT  0.99995131   -0 00 30.8
 HV4136;SPC MD       -   476,155.09  1,308,452.28   sFT  0.99995131   -0 00 30.8
 HV4136;SPC VA N     - 2,146,169.894 3,628,794.153   MT  0.99996771   +0 55 39.6
 HV4136;SPC VA N     - 7,041,225.73 11,905,468.82   sFT  0.99996771   +0 55 39.6
 HV4136;UTM  18      - 4,315,832.066   325,563.287   MT  0.99997469   -1 16 00.6
 HV4136
 HV4136!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4136!SPC MD       -   0.99999141  x   0.99995131  =   0.99994272
 HV4136!SPC VA N     -   0.99999141  x   0.99996771  =   0.99995912
 HV4136!UTM  18      -   0.99999141  x   0.99997469  =   0.99996610
 HV4136
 HV4136:                Primary Azimuth Mark                     Grid Az
 HV4136:SPC MD       -  PISGAH 2 WSSD 1930                       034 39 38.2
 HV4136:SPC VA N     -  PISGAH 2 WSSD 1930                       033 43 27.8
 HV4136:UTM  18      -  PISGAH 2 WSSD 1930                       035 55 08.0
 HV4136
 HV4136_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2556315832(NAD 83)
 HV4136
 HV4136|---------------------------------------------------------------------|
 HV4136| PID    Reference Object                     Distance      Geod. Az  |
 HV4136|                                                           dddmmss.s |
 HV4136| JV5930 PISGAH 2 WSSD 1930                  APPROX. 5.4 KM 0343907.4 |
 HV4136|---------------------------------------------------------------------|
 HV4136
 HV4136                          SUPERSEDED SURVEY CONTROL
 HV4136
 HV4136  NAD 83(1991)-  38 58 26.79906(N)    077 00 49.14590(W) AD(       ) 3
 HV4136  NAD 83(1986)-  38 58 26.79817(N)    077 00 49.15615(W) AD(       ) 3
 HV4136  NAD 27      -  38 58 26.40500(N)    077 00 50.23700(W) AD(       ) 3
 HV4136
 HV4136.Superseded values are not recommended for survey control.
 HV4136
 HV4136.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4136.See file dsdata.pdf to determine how the superseded data were derived.
 HV4136
 HV4136
 HV4136  HISTORY     - Date     Condition        Report By
 HV4136  HISTORY     - 1955     MONUMENTED       WSSC
 HV4136
 HV4136                          STATION DESCRIPTION
 HV4136
 HV4136'DESCRIBED BY WASH SUBURB SAN COMM 1955 (JHP)
 HV4136'STATION NOT MARKED.  STATION IS ON THE ROOF OF A NORTH ELEVATOR
 HV4136'SHAFT ON THE NW BUILDING OF HERALD REVIEW AND PUBLISHING CO. IN
 HV4136'TAKOMA PARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1996 ***********************************************************************
 HV1996  DESIGNATION -  HIGHWAY BRIDGE=TIDAL BM
 HV1996  PID         -  HV1996
 HV1996  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1996  COUNTRY     -  US
 HV1996  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1996
 HV1996                         *CURRENT SURVEY CONTROL
 HV1996  ______________________________________________________________________
 HV1996* NAD 83(1986) POSITION- 38 52 44.     (N) 077 02 21.     (W)   SCALED
 HV1996* NAVD 88 ORTHO HEIGHT -     2.614 (meters)        8.58  (feet) ADJUSTED
 HV1996  ______________________________________________________________________
 HV1996  GEOID HEIGHT    -        -32.104 (meters)                     GEOID18
 HV1996  DYNAMIC HEIGHT  -          2.613 (meters)        8.57  (feet) COMP
 HV1996  MODELED GRAVITY -    980,096.7   (mgal)                       NAVD 88
 HV1996
 HV1996  VERT ORDER      -  FIRST     CLASS II
 HV1996
 HV1996.The horizontal coordinates were scaled from a map and have
 HV1996.an estimated accuracy of +/- 6 seconds.
 HV1996
 HV1996.The orthometric height was determined by differential leveling and
 HV1996.adjusted by the NATIONAL GEODETIC SURVEY
 HV1996.in June 1991.
 HV1996
 HV1996.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1996.GEOID18 height accuracy estimate available here.
 HV1996
 HV1996.Click photographs - Photos may exist for this station.
 HV1996
 HV1996.The dynamic height is computed by dividing the NAVD 88
 HV1996.geopotential number by the normal gravity value computed on the
 HV1996.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1996.degrees latitude (g = 980.6199 gals.).
 HV1996
 HV1996.The modeled gravity was interpolated from observed gravity values.
 HV1996
 HV1996
 HV1996_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ231053(NAD 83)
 HV1996
 HV1996                          SUPERSEDED SURVEY CONTROL
 HV1996
 HV1996  NGVD 29 (11/26/84)    2.849  (m)            9.35   (f) ADJUSTED    1 2
 HV1996
 HV1996.Superseded values are not recommended for survey control.
 HV1996
 HV1996.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1996.See file dsdata.pdf to determine how the superseded data were derived.
 HV1996
 HV1996_MARKER: B = BOLT
 HV1996_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1996_SP_SET: BRIDGE
 HV1996_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1996
 HV1996  HISTORY     - Date     Condition        Report By
 HV1996  HISTORY     - UNK      MONUMENTED       USACE
 HV1996  HISTORY     - 1926     GOOD             PBPP
 HV1996  HISTORY     - 1972     MARK NOT FOUND   NGS
 HV1996
 HV1996                          STATION DESCRIPTION
 HV1996
 HV1996'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1996'AT WASHINGTON.
 HV1996'AT WASHINGTON, IN EAST POTOMAC PARK, AT THE NORTH END OF THE OLD
 HV1996'HIGHWAY BRIDGE OVER POTOMAC RIVER, AT THE NORTHEAST ABUTMENT,
 HV1996'AT THE NORTHWEST END OF THE NORTHWEST WING WALL, IN THE TOP OF
 HV1996'THE HORIZONTAL STONE AT THE ANGLE IN THE STEPS LEADING UP TO
 HV1996'THE BRIDGE FLOOR, AND ABOUT 4 FEET ABOVE THE GROUND.  THE TOP
 HV1996'OF A 3/4-INCH IRON BOLT.
 HV1996
 HV1996                          STATION RECOVERY (1972)
 HV1996
 HV1996'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1972
 HV1996'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4106 ***********************************************************************
 HV4106  DESIGNATION -  HOUSE AND HERMAN STORE DOME
 HV4106  PID         -  HV4106
 HV4106  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4106  COUNTRY     -  US
 HV4106  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4106
 HV4106                         *CURRENT SURVEY CONTROL
 HV4106  ______________________________________________________________________
 HV4106* NAD 83(1993) POSITION- 38 54 03.65607(N) 077 01 18.25934(W)   ADJUSTED
 HV4106  ______________________________________________________________________
 HV4106  GEOID HEIGHT    -        -32.083 (meters)                     GEOID18
 HV4106  LAPLACE CORR    -         -2.93  (seconds)                    DEFLEC18
 HV4106  HORZ ORDER      -  THIRD
 HV4106
 HV4106.The horizontal coordinates were established by classical geodetic methods
 HV4106.and adjusted by the National Geodetic Survey in November 1994.
 HV4106
 HV4106.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4106.GEOID18 height accuracy estimate available here.
 HV4106
 HV4106.Click photographs - Photos may exist for this station.
 HV4106
 HV4106.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4106
 HV4106. The following values were computed from the NAD 83(1993) position.
 HV4106
 HV4106;                    North         East     Units Scale Factor Converg.
 HV4106;SPC MD       -   137,018.263   398,114.328   MT  0.99994994   -0 00 49.1
 HV4106;SPC MD       -   449,534.08  1,306,146.76   sFT  0.99994994   -0 00 49.1
 HV4106;SPC VA N     - 2,138,045.286 3,628,224.097   MT  0.99996060   +0 55 21.4
 HV4106;SPC VA N     - 7,014,570.24 11,903,598.56   sFT  0.99996060   +0 55 21.4
 HV4106;UTM  18      - 4,307,735.128   324,682.670   MT  0.99997849   -1 16 11.7
 HV4106
 HV4106_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2468207735(NAD 83)
 HV4106
 HV4106                          SUPERSEDED SURVEY CONTROL
 HV4106
 HV4106  NAD 83(1991)-  38 54 03.65489(N)    077 01 18.26048(W) AD(       ) 3
 HV4106  NAD 83(1986)-  38 54 03.65444(N)    077 01 18.27108(W) AD(       ) 3
 HV4106  NAD 27      -  38 54 03.25400(N)    077 01 19.35200(W) AD(       ) 3
 HV4106  USSD        -  38 54 03.59100(N)    077 01 19.18200(W) AD(       ) 3
 HV4106
 HV4106.Superseded values are not recommended for survey control.
 HV4106
 HV4106.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4106.See file dsdata.pdf to determine how the superseded data were derived.
 HV4106
 HV4106_MARKER: 83 = FLAGSTAFF
 HV4106
 HV4106  HISTORY     - Date     Condition        Report By
 HV4106  HISTORY     - 1913     FIRST OBSERVED   CGS
 HV4106  HISTORY     - 1939     GOOD             CGS
 HV4106  HISTORY     - 20051204 MARK NOT FOUND   GEOCAC
 HV4106  HISTORY     - 20100314 MARK NOT FOUND   GEOCAC
 HV4106
 HV4106                          STATION DESCRIPTION
 HV4106
 HV4106'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4106'STATION IS CENTER OF FLAGSTAFF ON THE DOME OF HOUSE AND HERMAN
 HV4106'FURNITURE STORE AT NE CORNER OF 7TH AND I STREETS NW.
 HV4106
 HV4106                          STATION RECOVERY (1939)
 HV4106
 HV4106'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4106'STATION RECOVERED INTACT.  IT IS THE CENTER OF THE FLAGSTAFF ON THE
 HV4106'DOME OF HOUSE AND HERMAN FURNITURE STORE LOCATED AT THE NE
 HV4106'CORNER OF 7TH AND I STEETS NW.  THE DOME IS A TOWER-LIKE
 HV4106'PROJECTION ABOVE THE FLAT ROOF OF THE STORE.  IT HAS AN EGG-SHAPED
 HV4106'GILDED TOP, FROM THE CENTER OF WHICH THE FLAGPOLE RISES.  THE
 HV4106'DOME IS A CONTINUATION OF A SEMI-CIRCULAR OFF-SET AT THE SW
 HV4106'CORNER OF THE BUILDING.  STATION IS 16 METERS N OF THE CENTER
 HV4106'LINE OF I STREET AND 15.5 METERS E OF THE CENTER LINE OF 7TH
 HV4106'STREET.
 HV4106
 HV4106                          STATION RECOVERY (2005)
 HV4106
 HV4106'RECOVERY NOTE BY GEOCACHING 2005 (WD)
 HV4106'THE BUILDING REMAINS AS DESCRIBED IN 1939, BUT THERE IS NO LONGER A
 HV4106'FLAGPOLE RISING FROM THE DOME.
 HV4106
 HV4106                          STATION RECOVERY (2010)
 HV4106
 HV4106'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 HV4106'THE FLAGPOLE WHOSE CENTER WAS THE STATION HAS BEN REMOVED, ALTHOUGH
 HV4106'THE DOME AND BUILDING ARE STILL THERE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4131 ***********************************************************************
 HV4131  DESIGNATION -  HOWARD
 HV4131  PID         -  HV4131
 HV4131  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4131  COUNTRY     -  US
 HV4131  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4131
 HV4131                         *CURRENT SURVEY CONTROL
 HV4131  ______________________________________________________________________
 HV4131* NAD 83(1993) POSITION- 38 55 20.63901(N) 077 01 10.90097(W)   ADJUSTED
 HV4131  ______________________________________________________________________
 HV4131  GEOID HEIGHT    -        -32.045 (meters)                     GEOID18
 HV4131  LAPLACE CORR    -         -2.57  (seconds)                    DEFLEC18
 HV4131  HORZ ORDER      -  THIRD
 HV4131
 HV4131.The horizontal coordinates were established by classical geodetic methods
 HV4131.and adjusted by the National Geodetic Survey in November 1994.
 HV4131
 HV4131.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4131.GEOID18 height accuracy estimate available here.
 HV4131
 HV4131.Click photographs - Photos may exist for this station.
 HV4131
 HV4131.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4131
 HV4131. The following values were computed from the NAD 83(1993) position.
 HV4131
 HV4131;                    North         East     Units Scale Factor Converg.
 HV4131;SPC MD       -   139,392.040   398,292.141   MT  0.99995018   -0 00 44.5
 HV4131;SPC MD       -   457,322.05  1,306,730.13   sFT  0.99995018   -0 00 44.5
 HV4131;SPC VA N     - 2,140,421.678 3,628,363.101   MT  0.99996251   +0 55 26.0
 HV4131;SPC VA N     - 7,022,366.79 11,904,054.61   sFT  0.99996251   +0 55 26.0
 HV4131;UTM  18      - 4,310,104.500   324,912.503   MT  0.99997750   -1 16 09.2
 HV4131
 HV4131_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2491210104(NAD 83)
 HV4131
 HV4131                          SUPERSEDED SURVEY CONTROL
 HV4131
 HV4131  NAD 83(1991)-  38 55 20.63806(N)    077 01 10.90189(W) AD(       ) 3
 HV4131  NAD 83(1986)-  38 55 20.63755(N)    077 01 10.91242(W) AD(       ) 3
 HV4131  NAD 27      -  38 55 20.24300(N)    077 01 11.99300(W) AD(       ) 3
 HV4131
 HV4131.Superseded values are not recommended for survey control.
 HV4131
 HV4131.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4131.See file dsdata.pdf to determine how the superseded data were derived.
 HV4131
 HV4131_MARKER: 89 = SPIRE
 HV4131
 HV4131  HISTORY     - Date     Condition        Report By
 HV4131  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4131
 HV4131                          STATION DESCRIPTION
 HV4131
 HV4131'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4131'STATION IS THE CENTER OF THE FINIAL ON THE WHITE SPIRE, WITH
 HV4131'FOUR-FACED CLOCK, ON FOUNDERS LIBRARY ERECTED IN 1938 IN THE
 HV4131'GROUNDS OF HOWARD UNIVERSITY BETWEEN 4TH AND 6TH STREETS AND
 HV4131'NORTH OF COLLEGE STREET, N.W.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6614 ***********************************************************************
 DL6614  DESIGNATION -  HV2009
 DL6614  PID         -  DL6614
 DL6614  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6614  COUNTRY     -  US
 DL6614  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6614
 DL6614                         *CURRENT SURVEY CONTROL
 DL6614  ______________________________________________________________________
 DL6614* NAD 83(1986) POSITION- 38 52 57.5    (N) 077 01 58.7    (W)   HD_HELD2
 DL6614* NAVD 88 ORTHO HEIGHT -     3.431 (meters)       11.26  (feet) ADJUSTED
 DL6614  ______________________________________________________________________
 DL6614  GEOID HEIGHT    -        -32.105 (meters)                     GEOID18
 DL6614  DYNAMIC HEIGHT  -          3.429 (meters)       11.25  (feet) COMP
 DL6614  MODELED GRAVITY -    980,097.6   (mgal)                       NAVD 88
 DL6614
 DL6614  VERT ORDER      -  FIRST     CLASS II
 DL6614
 DL6614.The horizontal coordinates were established by autonomous hand held GPS
 DL6614.observations and have an estimated accuracy of +/- 10 meters.
 DL6614
 DL6614.The orthometric height was determined by differential leveling and
 DL6614.adjusted by the NATIONAL GEODETIC SURVEY
 DL6614.in April 2010.
 DL6614
 DL6614.No vertical observational check was made to the station.
 DL6614
 DL6614.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6614.GEOID18 height accuracy estimate available here.
 DL6614
 DL6614.Click photographs - Photos may exist for this station.
 DL6614
 DL6614.The dynamic height is computed by dividing the NAVD 88
 DL6614.geopotential number by the normal gravity value computed on the
 DL6614.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6614.degrees latitude (g = 980.6199 gals.).
 DL6614
 DL6614.The modeled gravity was interpolated from observed gravity values.
 DL6614
 DL6614
 DL6614_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2366305717(NAD 83)
 DL6614
 DL6614                          SUPERSEDED SURVEY CONTROL
 DL6614
 DL6614.No superseded survey control is available for this station.
 DL6614
 DL6614_MARKER: B = BOLT
 DL6614_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 DL6614_SP_SET: SIDEWALK
 DL6614_MARK LOGO: NONE
 DL6614_MAGNETIC: N = NO MAGNETIC MATERIAL
 DL6614_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 DL6614
 DL6614  HISTORY     - Date     Condition        Report By
 DL6614  HISTORY     - UNK      MONUMENTED       NPS
 DL6614  HISTORY     - 200812   GOOD             NGS
 DL6614  HISTORY     - 20120301 GOOD             NGS
 DL6614
 DL6614                          STATION DESCRIPTION
 DL6614
 DL6614'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6614'THE MARK IS LOCATED 0.21 MI (0.3 KM) NORTHEAST OF THE JEFFERSON
 DL6614'MEMORIAL, NORTHEAST OF THE JUNCTION OF EAST BASIN DR AND OHIO DRIVE ON
 DL6614'THE FOOT BRIDGE.
 DL6614'
 DL6614'TO REACH FROM MAINE AVENUE AND R. WALLENBERG PLACE TRAVEL SOUTHEAST ON
 DL6614'MAINE AVENUE FOR.10 MI PROCEED SOUTH ALONG EAST BASIN DRIVE FOR.07 TO
 DL6614'MARK ON THE FOOT BRIDGE.
 DL6614'
 DL6614'THE MARK IS A BOLT SET IN A DRILL HOLE ON THE FOOT BRIDGE.
 DL6614'
 DL6614'THE MARK IS 115 FT (35.1 M) SOUTHEAST FROM NORTH CORNER OF THE FOOT
 DL6614'BRIDGE, 16.4 FT (5.0 M) WEST OF THE EAST RAIL OF FOOT BRIDGE, 58.6 FT
 DL6614'(17.9 M) NORTHEAST OF THE SOUTH CORNER OF THE FOOT BRIDGE AND 1.4 FT
 DL6614'(0.4 M) EAST OF THE WEST RAIL OF FOOT BRIDGE.
 DL6614
 DL6614                          STATION RECOVERY (2012)
 DL6614
 DL6614'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DL6614'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1838 ***********************************************************************
 HV1838  DESIGNATION -  I=M 8=TIDAL
 HV1838  PID         -  HV1838
 HV1838  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1838  COUNTRY     -  US
 HV1838  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1838
 HV1838                         *CURRENT SURVEY CONTROL
 HV1838  ______________________________________________________________________
 HV1838* NAD 83(1986) POSITION- 38 53 22.32   (N) 077 02 00.02   (W)   HD_HELD1
 HV1838* NAVD 88 ORTHO HEIGHT -     6.018 (meters)       19.74  (feet) ADJUSTED
 HV1838  ______________________________________________________________________
 HV1838  GEOID HEIGHT    -        -32.091 (meters)                     GEOID18
 HV1838  DYNAMIC HEIGHT  -          6.014 (meters)       19.73  (feet) COMP
 HV1838  MODELED GRAVITY -    980,098.1   (mgal)                       NAVD 88
 HV1838  OBS GRAVITY     -    980,102.3   (mgal)                       GRAV_OBS
 HV1838
 HV1838  VERT ORDER      -  FIRST     CLASS II
 HV1838
 HV1838.The horizontal coordinates were determined by differentially corrected
 HV1838.hand held GPS observations or other comparable positioning techniques
 HV1838.and have an estimated accuracy of +/- 3 meters.
 HV1838
 HV1838.The orthometric height was determined by differential leveling and
 HV1838.adjusted by the NATIONAL GEODETIC SURVEY
 HV1838.in February 2015.
 HV1838
 HV1838.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1838.GEOID18 height accuracy estimate available here.
 HV1838
 HV1838.Click photographs - Photos may exist for this station.
 HV1838
 HV1838.The dynamic height is computed by dividing the NAVD 88
 HV1838.geopotential number by the normal gravity value computed on the
 HV1838.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1838.degrees latitude (g = 980.6199 gals.).
 HV1838
 HV1838.The modeled gravity was interpolated from observed gravity values.
 HV1838
 HV1838.The observed gravity was obtained from relative gravimeter ties
 HV1838.to the IGSN71 gravity network.
 HV1838
 HV1838
 HV1838_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2364806483(NAD 83)
 HV1838
 HV1838                          SUPERSEDED SURVEY CONTROL
 HV1838
 HV1838  NAVD 88 (06/15/91)    6.021  (m)           19.75   (f) SUPERSEDED  1 2
 HV1838  NGVD 29 (11/26/84)    6.255  (m)           20.52   (f) ADJUSTED    1 2
 HV1838
 HV1838.Superseded values are not recommended for survey control.
 HV1838
 HV1838.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1838.See file dsdata.pdf to determine how the superseded data were derived.
 HV1838
 HV1838_MARKER: X = CHISELED CROSS
 HV1838_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1838_SP_SET: STEP
 HV1838_MARK LOGO: NONE
 HV1838_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1838_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1838+SATELLITE: SATELLITE OBSERVATIONS - December 11, 2021
 HV1838
 HV1838  HISTORY     - Date     Condition        Report By
 HV1838  HISTORY     - UNK      MONUMENTED       PBPP
 HV1838  HISTORY     - 1941     GOOD             CGS
 HV1838  HISTORY     - 1956     GOOD             CGS
 HV1838  HISTORY     - 1978     GOOD             DMA
 HV1838  HISTORY     - 20081229 GOOD             GEOCAC
 HV1838  HISTORY     - 20100521 GOOD             GEOCAC
 HV1838  HISTORY     - 20120301 GOOD             NGS
 HV1838  HISTORY     - 20140410 GOOD             NGS
 HV1838  HISTORY     - 20180718 GOOD             USPSQD
 HV1838  HISTORY     - 20211211 GOOD             USPSQD
 HV1838
 HV1838                          STATION DESCRIPTION
 HV1838
 HV1838'DESCRIBED BY COAST AND GEODETIC SURVEY 1941
 HV1838'AT WASHINGTON.
 HV1838'AT WASHINGTON, JUST EAST OF THE WASHINGTON MONUMENT, ON THE
 HV1838'EAST SIDE OF A SMALL LODGE, AT THE MAIN ENTRANCE, ON THE TOP
 HV1838'OF THE NORTH END OF THE TOP STEP, 3 INCHES FROM THE SOUTH SIDE
 HV1838'OF THE BASE OF A COLUMN, AND 3 INCHES FROM THE EAST EDGE.  THE
 HV1838'SOUTHWEST QUADRANT OF A CHISELED CROSS.
 HV1838
 HV1838                          STATION RECOVERY (1956)
 HV1838
 HV1838'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956
 HV1838'RECOVERED IN GOOD CONDITION.
 HV1838
 HV1838                          STATION RECOVERY (1978)
 HV1838
 HV1838'RECOVERY NOTE BY DEFENSE MAP AGENCY 1978
 HV1838'RECOVERED IN GOOD CONDITION.
 HV1838
 HV1838                          STATION RECOVERY (2008)
 HV1838
 HV1838'RECOVERY NOTE BY GEOCACHING 2008 (WD)
 HV1838'RECENT RENOVATIONS TO THE AREA INCLUDED A NEW SIDEWALK AT THE EAST
 HV1838'SIDE OF THE GREY STONE WASHINGTON MONUMENT LODGE.  THE NEW SIDEWALK IS
 HV1838'NOW LEVEL WITH THE GRANITE SLAB THAT FORMERLY FORMED THE TOP STEP OF
 HV1838'THE EAST PORCH.  THE CHISELED CROSS SURVIVES ABOUT FOUR FEET
 HV1838'NORTHEAST OF THE CENTER OF THE DOORWAY, THREE INCHES SOUTH OF THE
 HV1838'SOUTH EDGE OF THE STONE WALL ON THE NORTH SIDE OF THE ENTRANCE, AND
 HV1838'THREE INCHES WEST OF THE SEAM BETWEEN A GRANITE SLAB THAT RUNS
 HV1838'NORTH-SOUTH BETWEEN THE STONE WALLS ON EITHER SIDE OF THE ENTRANCE AND
 HV1838'THE SIDEWALK LYING IMMEDIATELY EAST.
 HV1838
 HV1838                          STATION RECOVERY (2010)
 HV1838
 HV1838'RECOVERY NOTE BY GEOCACHING 2010 (MTT)
 HV1838'RECOVERED IN GOOD CONDITION.
 HV1838
 HV1838                          STATION RECOVERY (2012)
 HV1838
 HV1838'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1838'RECOVERED AS DESCRIBED.
 HV1838
 HV1838                          STATION RECOVERY (2014)
 HV1838
 HV1838'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (KF)
 HV1838'RECOVERED AS DESCRIBED.
 HV1838
 HV1838                          STATION RECOVERY (2018)
 HV1838
 HV1838'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV1838'THE CROSS IS GETTING HARD TO SEE.
 HV1838
 HV1838                          STATION RECOVERY (2021)
 HV1838
 HV1838'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 HV1838'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2002 ***********************************************************************
 HV2002  DESIGNATION -  INLET GATES
 HV2002  PID         -  HV2002
 HV2002  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2002  COUNTRY     -  US
 HV2002  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2002
 HV2002                         *CURRENT SURVEY CONTROL
 HV2002  ______________________________________________________________________
 HV2002* NAD 83(1986) POSITION- 38 52 48.     (N) 077 02 24.     (W)   SCALED
 HV2002* NAVD 88 ORTHO HEIGHT -     2.68  (+/-2cm)        8.8   (feet) VERTCON3
 HV2002  ______________________________________________________________________
 HV2002  GEOID HEIGHT    -        -32.100 (meters)                     GEOID18
 HV2002  VERT ORDER      -  ? (See Below)
 HV2002
 HV2002.The horizontal coordinates were scaled from a map and have
 HV2002.an estimated accuracy of +/- 6 seconds.
 HV2002
 HV2002.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV2002.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV2002
 HV2002.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2002.GEOID18 height accuracy estimate available here.
 HV2002
 HV2002.The vertical order pertains to the NGVD 29 superseded value.
 HV2002
 HV2002.Click photographs - Photos may exist for this station.
 HV2002
 HV2002
 HV2002_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ230054(NAD 83)
 HV2002
 HV2002                          SUPERSEDED SURVEY CONTROL
 HV2002
 HV2002  NGVD 29 (11/26/84)    2.920  (m)            9.58   (f) ADJUSTED       
 HV2002
 HV2002.Superseded values are not recommended for survey control.
 HV2002
 HV2002.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2002.See file dsdata.pdf to determine how the superseded data were derived.
 HV2002
 HV2002_MARKER: B = BOLT
 HV2002_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2002_SP_SET: STEP
 HV2002_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2002
 HV2002  HISTORY     - Date     Condition        Report By
 HV2002  HISTORY     - UNK      MONUMENTED       NONE
 HV2002  HISTORY     - 1937     GOOD             CGS
 HV2002  HISTORY     - 1941     MARK NOT FOUND   CGS
 HV2002
 HV2002                          STATION DESCRIPTION
 HV2002
 HV2002'DESCRIBED BY COAST AND GEODETIC SURVEY 1937
 HV2002'AT WASHINGTON.
 HV2002'AT WASHINGTON, IN WEST POTOMAC PARK, AT THE BRIDGE OVER THE INLET
 HV2002'TO THE TIDAL BASIN, AT THE SOUTHEAST CORNER OF INLET BRIDGE, AT
 HV2002'THE TOP OF THE STEPS LEADING UP FROM THE SEAWALL, AND IN
 HV2002'THE SOUTHEAST CORNER OF THE LANDING.  A COPPER BOLT.  NOTE-- IT
 HV2002'WAS REPORTED THAT A CHISELED SQUARE FORMED BY TWO GROOVES AT
 HV2002'RIGHT ANGLES (THE NORTH FACE OF THE ABUTMENT AND THE WEST SIDE
 HV2002'OF THE POST OF A GATE TO A SPACE UNDER THE BRIDGE SIDEWALK)
 HV2002'WAS FOUND AT THE DESCRIBED LOCATION, BUT NO COPPER BOLT.
 HV2002
 HV2002                          STATION RECOVERY (1941)
 HV2002
 HV2002'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1941
 HV2002'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4674 ***********************************************************************
 HV4674  DESIGNATION -  INSANE ECC
 HV4674  PID         -  HV4674
 HV4674  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4674  COUNTRY     -  US
 HV4674  USGS QUAD   -  ANACOSTIA (2016)
 HV4674
 HV4674                         *CURRENT SURVEY CONTROL
 HV4674  ______________________________________________________________________
 HV4674* NAD 83(1993) POSITION- 38 51 17.30810(N) 077 00 00.10147(W)   ADJUSTED
 HV4674* NAVD 88 ORTHO HEIGHT -    50.    (meters)      164.    (feet) SCALED
 HV4674  ______________________________________________________________________
 HV4674  GEOID HEIGHT    -        -32.202 (meters)                     GEOID18
 HV4674  LAPLACE CORR    -         -2.70  (seconds)                    DEFLEC18
 HV4674  HORZ ORDER      -  FIRST
 HV4674
 HV4674.The horizontal coordinates were established by classical geodetic methods
 HV4674.and adjusted by the National Geodetic Survey in November 1994.
 HV4674
 HV4674.The orthometric height was scaled from a topographic map.
 HV4674
 HV4674.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4674.GEOID18 height accuracy estimate available here.
 HV4674
 HV4674.Click photographs - Photos may exist for this station.
 HV4674
 HV4674.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4674
 HV4674. The following values were computed from the NAD 83(1993) position.
 HV4674
 HV4674;                    North         East     Units Scale Factor Converg.
 HV4674;SPC MD       -   131,888.625   399,997.553   MT  0.99994991   -0 00 00.1
 HV4674;SPC MD       -   432,704.60  1,312,325.31   sFT  0.99994991   -0 00 00.1
 HV4674;SPC VA N     - 2,132,947.059 3,630,190.903   MT  0.99995694   +0 56 10.2
 HV4674;SPC VA N     - 6,997,843.81 11,910,051.32   sFT  0.99995694   +0 56 10.2
 HV4674;UTM  18      - 4,302,565.326   326,453.080   MT  0.99997089   -1 15 18.1
 HV4674
 HV4674!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4674!SPC MD       -   0.99999725  x   0.99994991  =   0.99994716
 HV4674!SPC VA N     -   0.99999725  x   0.99995694  =   0.99995419
 HV4674!UTM  18      -   0.99999725  x   0.99997089  =   0.99996814
 HV4674
 HV4674:                Primary Azimuth Mark                     Grid Az
 HV4674:SPC MD       -  WIRE 2                                   282 07 05.8
 HV4674:SPC VA N     -  WIRE 2                                   281 10 55.5
 HV4674:UTM  18      -  WIRE 2                                   283 22 23.8
 HV4674
 HV4674_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2645302565(NAD 83)
 HV4674
 HV4674|---------------------------------------------------------------------|
 HV4674| PID    Reference Object                     Distance      Geod. Az  |
 HV4674|                                                           dddmmss.s |
 HV4674| DC6382 INSANE RM 1                           6.768 METERS 08703     |
 HV4674| HV4766 INSANE ASYLUM STA TURRET              3.096 METERS 12259     |
 HV4674| DC6383 INSANE RM 2                           3.868 METERS 20452     |
 HV4674| HV4608 ALEXANDRIA EPIS THEO SEM SPIRE      APPROX. 8.8 KM 2442633.8 |
 HV4674| HV4641 WIRE 2                              APPROX. 7.1 KM 2820705.7 |
 HV4674| HV4664 BUZZARD PT PLANT PEPCO STACK        APPROX. 1.5 KM 3182002.7 |
 HV4674| HV4675 INSANE                                1.298 METERS 33247     |
 HV4674|---------------------------------------------------------------------|
 HV4674
 HV4674                          SUPERSEDED SURVEY CONTROL
 HV4674
 HV4674  NAD 83(1991)-  38 51 17.30660(N)    077 00 00.10260(W) AD(       ) 1
 HV4674  NAD 83(1986)-  38 51 17.30631(N)    077 00 00.11384(W) AD(       ) 1
 HV4674  NAD 27      -  38 51 16.90400(N)    077 00 01.19600(W) AD(       ) 1
 HV4674
 HV4674.Superseded values are not recommended for survey control.
 HV4674
 HV4674.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4674.See file dsdata.pdf to determine how the superseded data were derived.
 HV4674
 HV4674
 HV4674  HISTORY     - Date     Condition        Report By
 HV4674  HISTORY     - 1934     MONUMENTED       CGS
 HV4674
 HV4674                          STATION DESCRIPTION
 HV4674
 HV4674'DESCRIBED BY COAST AND GEODETIC SURVEY 1934
 HV4674'STATION IS ON ROOF 1.319 METERS FROM STATION INSANE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4260 ***********************************************************************
 HV4260  DESIGNATION -  ITALIAN
 HV4260  PID         -  HV4260
 HV4260  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4260  COUNTRY     -  US
 HV4260  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4260
 HV4260                         *CURRENT SURVEY CONTROL
 HV4260  ______________________________________________________________________
 HV4260* NAD 83(1993) POSITION- 38 56 25.37570(N) 077 02 29.30638(W)   ADJUSTED
 HV4260  ______________________________________________________________________
 HV4260  GEOID HEIGHT    -        -31.999 (meters)                     GEOID18
 HV4260  LAPLACE CORR    -         -2.06  (seconds)                    DEFLEC18
 HV4260  HORZ ORDER      -  THIRD
 HV4260
 HV4260.The horizontal coordinates were established by classical geodetic methods
 HV4260.and adjusted by the National Geodetic Survey in November 1994.
 HV4260
 HV4260.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4260.GEOID18 height accuracy estimate available here.
 HV4260
 HV4260.Click photographs - Photos may exist for this station.
 HV4260
 HV4260.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4260
 HV4260. The following values were computed from the NAD 83(1993) position.
 HV4260
 HV4260;                    North         East     Units Scale Factor Converg.
 HV4260;SPC MD       -   141,388.876   396,404.422   MT  0.99995048   -0 01 33.7
 HV4260;SPC MD       -   463,873.34  1,300,536.84   sFT  0.99995048   -0 01 33.7
 HV4260;SPC VA N     - 2,142,387.427 3,626,442.980   MT  0.99996423   +0 54 37.1
 HV4260;SPC VA N     - 7,028,816.08 11,897,755.01   sFT  0.99996423   +0 54 37.1
 HV4260;UTM  18      - 4,312,142.335   323,068.990   MT  0.99998549   -1 17 00.3
 HV4260
 HV4260_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2306812142(NAD 83)
 HV4260
 HV4260                          SUPERSEDED SURVEY CONTROL
 HV4260
 HV4260  NAD 83(1991)-  38 56 25.37494(N)    077 02 29.30734(W) AD(       ) 3
 HV4260  NAD 83(1986)-  38 56 25.37441(N)    077 02 29.31765(W) AD(       ) 3
 HV4260  NAD 27      -  38 56 24.97600(N)    077 02 30.38800(W) AD(       ) 3
 HV4260
 HV4260.Superseded values are not recommended for survey control.
 HV4260
 HV4260.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4260.See file dsdata.pdf to determine how the superseded data were derived.
 HV4260
 HV4260_MARKER: 85 = CHIMNEY
 HV4260
 HV4260  HISTORY     - Date     Condition        Report By
 HV4260  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4260  HISTORY     - 1971     GOOD             NGS
 HV4260
 HV4260                          STATION DESCRIPTION
 HV4260
 HV4260'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4260'STATION IS THE CENTER OF THE STUCCO CHIMNEY ON THE SOUTH SIDE
 HV4260'OF A RESIDENCE AT 4010- 18TH STREET, N.W.  CHIMNEY HAS A T-TOP
 HV4260'OF VITRIFIED TILE.
 HV4260
 HV4260                          STATION RECOVERY (1971)
 HV4260
 HV4260'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4260'STATION WAS RECOVERED IN GOOD CONDITION AS PREVIOUSLY DESCRIBED.  THE
 HV4260'HOUSE IS PAINTED PINK, AND HAS A TILE ROOF.
 HV4260'
 HV4260'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DISTRICT
 HV4260'OF COLUMBIA
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1878 ***********************************************************************
 HV1878  DESIGNATION -  J 1
 HV1878  PID         -  HV1878
 HV1878  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1878  COUNTRY     -  US
 HV1878  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1878
 HV1878                         *CURRENT SURVEY CONTROL
 HV1878  ______________________________________________________________________
 HV1878* NAD 83(1986) POSITION- 38 54 17.     (N) 077 04 09.     (W)   SCALED
 HV1878* NAVD 88 ORTHO HEIGHT -    22.125 (meters)       72.59  (feet) ADJUSTED
 HV1878  ______________________________________________________________________
 HV1878  GEOID HEIGHT    -        -32.016 (meters)                     GEOID18
 HV1878  DYNAMIC HEIGHT  -         22.113 (meters)       72.55  (feet) COMP
 HV1878  MODELED GRAVITY -    980,092.1   (mgal)                       NAVD 88
 HV1878
 HV1878  VERT ORDER      -  FIRST     CLASS II
 HV1878
 HV1878.The horizontal coordinates were scaled from a map and have
 HV1878.an estimated accuracy of +/- 6 seconds.
 HV1878
 HV1878.The orthometric height was determined by differential leveling and
 HV1878.adjusted by the NATIONAL GEODETIC SURVEY
 HV1878.in June 1991.
 HV1878
 HV1878.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1878.GEOID18 height accuracy estimate available here.
 HV1878
 HV1878.Click photographs - Photos may exist for this station.
 HV1878
 HV1878.The dynamic height is computed by dividing the NAVD 88
 HV1878.geopotential number by the normal gravity value computed on the
 HV1878.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1878.degrees latitude (g = 980.6199 gals.).
 HV1878
 HV1878.The modeled gravity was interpolated from observed gravity values.
 HV1878
 HV1878
 HV1878_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ205082(NAD 83)
 HV1878
 HV1878                          SUPERSEDED SURVEY CONTROL
 HV1878
 HV1878  NGVD 29 (11/26/84)   22.355  (m)           73.34   (f) ADJUSTED    1 2
 HV1878
 HV1878.Superseded values are not recommended for survey control.
 HV1878
 HV1878.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1878.See file dsdata.pdf to determine how the superseded data were derived.
 HV1878
 HV1878_MARKER: DB = BENCH MARK DISK
 HV1878_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1878_SP_SET: SIDEWALK
 HV1878_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1878
 HV1878  HISTORY     - Date     Condition        Report By
 HV1878  HISTORY     - 1914     MONUMENTED       CGS
 HV1878  HISTORY     - 1923     GOOD             CGS
 HV1878
 HV1878                          STATION DESCRIPTION
 HV1878
 HV1878'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1878'IN GEORGETOWN.
 HV1878'IN GEORGETOWN AT THE NORTH END OF KEY BRIDGE, IN THE WEST SIDE
 HV1878'OF THE WEST SIDEWALK, AT THE FOOT OF THE FOURTH LAMP POST
 HV1878'(ABOUT 60 FEET) FROM THE NORTHWEST CORNER OF THE BRIDGE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8051 ***********************************************************************
 HV8051  DESIGNATION -  J 1 RESET 1948
 HV8051  PID         -  HV8051
 HV8051  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8051  COUNTRY     -  US
 HV8051  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8051
 HV8051                         *CURRENT SURVEY CONTROL
 HV8051  ______________________________________________________________________
 HV8051* NAD 83(1986) POSITION- 38 54 17.     (N) 077 04 10.     (W)   SCALED
 HV8051* NAVD 88 ORTHO HEIGHT -    22.14  (+/-2cm)       72.6   (feet) VERTCON3
 HV8051  ______________________________________________________________________
 HV8051  GEOID HEIGHT    -        -32.016 (meters)                     GEOID18
 HV8051  VERT ORDER      -  THIRD (See Below)
 HV8051
 HV8051.The horizontal coordinates were scaled from a map and have
 HV8051.an estimated accuracy of +/- 6 seconds.
 HV8051
 HV8051.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV8051.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV8051
 HV8051.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8051.GEOID18 height accuracy estimate available here.
 HV8051
 HV8051.The vertical order pertains to the NGVD 29 superseded value.
 HV8051
 HV8051.Click photographs - Photos may exist for this station.
 HV8051
 HV8051
 HV8051_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ205082(NAD 83)
 HV8051
 HV8051                          SUPERSEDED SURVEY CONTROL
 HV8051
 HV8051  NGVD 29 (??/??/??)   22.37   (m)           73.4    (f) RESET       3  
 HV8051
 HV8051.Superseded values are not recommended for survey control.
 HV8051
 HV8051.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8051.See file dsdata.pdf to determine how the superseded data were derived.
 HV8051
 HV8051_MARKER: DB = BENCH MARK DISK
 HV8051_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV8051_SP_SET: SIDEWALK
 HV8051_STAMPING: J 1 RESET 1948
 HV8051_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV8051
 HV8051  HISTORY     - Date     Condition        Report By
 HV8051  HISTORY     - 1948     MONUMENTED       CGS
 HV8051  HISTORY     - 19950607 MARK NOT FOUND   USPSQD
 HV8051  HISTORY     - 19950818 MARK NOT FOUND   USPSQD
 HV8051
 HV8051                          STATION DESCRIPTION
 HV8051
 HV8051'DESCRIBED BY COAST AND GEODETIC SURVEY 1948
 HV8051'IN GEORGETOWN.
 HV8051'AT WASHINGTON, IN GEORGETOWN, AT THE NORTH END OF KEY BRIDGE,
 HV8051'AT THE FOOT OF THE FOURTH LAMP POST FROM THE NORTH
 HV8051'END OF THE BRIDGE, DIRECTLY ACROSS THE STREE AND ON THE OPPOSITE SIDE
 HV8051'OF THE BRIDGE FROM BENCH MARK J 1, AND IN THE EAST SIDEWALK. A
 HV8051'STANDARD DISK, STAMPED 'J 1 RESET 1948'.
 HV8051
 HV8051                          STATION RECOVERY (1995)
 HV8051
 HV8051'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV8051'MARK NOT FOUND.
 HV8051
 HV8051                          STATION RECOVERY (1995)
 HV8051
 HV8051'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV8051'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1879 ***********************************************************************
 HV1879  DESIGNATION -  J 1 RESET 1956
 HV1879  PID         -  HV1879
 HV1879  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1879  COUNTRY     -  US
 HV1879  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1879
 HV1879                         *CURRENT SURVEY CONTROL
 HV1879  ______________________________________________________________________
 HV1879* NAD 83(1986) POSITION- 38 54 17.     (N) 077 04 10.     (W)   SCALED
 HV1879* NAVD 88 ORTHO HEIGHT -    19.012 (meters)       62.38  (feet) ADJUSTED
 HV1879  ______________________________________________________________________
 HV1879  GEOID HEIGHT    -        -32.016 (meters)                     GEOID18
 HV1879  DYNAMIC HEIGHT  -         19.002 (meters)       62.34  (feet) COMP
 HV1879  MODELED GRAVITY -    980,092.1   (mgal)                       NAVD 88
 HV1879
 HV1879  VERT ORDER      -  FIRST     CLASS II
 HV1879
 HV1879.The horizontal coordinates were scaled from a map and have
 HV1879.an estimated accuracy of +/- 6 seconds.
 HV1879
 HV1879.The orthometric height was determined by differential leveling and
 HV1879.adjusted by the NATIONAL GEODETIC SURVEY
 HV1879.in June 1991.
 HV1879
 HV1879.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1879.GEOID18 height accuracy estimate available here.
 HV1879
 HV1879.Click photographs - Photos may exist for this station.
 HV1879
 HV1879.The dynamic height is computed by dividing the NAVD 88
 HV1879.geopotential number by the normal gravity value computed on the
 HV1879.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1879.degrees latitude (g = 980.6199 gals.).
 HV1879
 HV1879.The modeled gravity was interpolated from observed gravity values.
 HV1879
 HV1879
 HV1879_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ205082(NAD 83)
 HV1879
 HV1879                          SUPERSEDED SURVEY CONTROL
 HV1879
 HV1879  NGVD 29 (??/??/??)   19.24   (m)           63.1    (f) RESET       3  
 HV1879
 HV1879.Superseded values are not recommended for survey control.
 HV1879
 HV1879.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1879.See file dsdata.pdf to determine how the superseded data were derived.
 HV1879
 HV1879_MARKER: DB = BENCH MARK DISK
 HV1879_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1879_SP_SET: PIER
 HV1879_STAMPING: J 1 RESET 1956
 HV1879_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1879
 HV1879  HISTORY     - Date     Condition        Report By
 HV1879  HISTORY     - 1956     MONUMENTED       CGS
 HV1879  HISTORY     - 1965     GOOD             CGS
 HV1879  HISTORY     - 1979     GOOD             NGS
 HV1879  HISTORY     - 19950607 MARK NOT FOUND   USPSQD
 HV1879  HISTORY     - 19950819 MARK NOT FOUND   USPSQD
 HV1879
 HV1879                          STATION DESCRIPTION
 HV1879
 HV1879'DESCRIBED BY COAST AND GEODETIC SURVEY 1956
 HV1879'IN GEORGETOWN.
 HV1879'AT WASHINGTON, IN GEORGETOWN, NEAR THE NORTH END OF KEY BRIDGE,
 HV1879'ON THE OUTSIDE OF THE CURVED RAMP LEADING WHITEHURST FREEWAY ONTO
 HV1879'THE BRIDGE, AT THE NORTHWEST CORNER OF THE BRIDGE OVER THE
 HV1879'CHESAPEAKE AND OHIO CANAL, AND IN THE TOP OF THE PIER.  A STANDARD
 HV1879'DISK, STAMPED J 1 RESET 1956.
 HV1879
 HV1879                          STATION RECOVERY (1965)
 HV1879
 HV1879'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1965
 HV1879'RECOVERED IN GOOD CONDITION.
 HV1879
 HV1879                          STATION RECOVERY (1979)
 HV1879
 HV1879'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1879'RECOVERED IN GOOD CONDITION.
 HV1879
 HV1879                          STATION RECOVERY (1995)
 HV1879
 HV1879'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1879'MARK NOT FOUND.
 HV1879
 HV1879                          STATION RECOVERY (1995)
 HV1879
 HV1879'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1879'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1460 ***********************************************************************
 HV1460  DESIGNATION -  J 4 DCDHT
 HV1460  PID         -  HV1460
 HV1460  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1460  COUNTRY     -  US
 HV1460  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1460
 HV1460                         *CURRENT SURVEY CONTROL
 HV1460  ______________________________________________________________________
 HV1460* NAD 83(1986) POSITION- 38 53 44.     (N) 076 57 08.     (W)   SCALED
 HV1460* NAVD 88 ORTHO HEIGHT -    13.696 (meters)       44.93  (feet) ADJUSTED
 HV1460  ______________________________________________________________________
 HV1460  GEOID HEIGHT    -        -32.228 (meters)                     GEOID18
 HV1460  DYNAMIC HEIGHT  -         13.689 (meters)       44.91  (feet) COMP
 HV1460  MODELED GRAVITY -    980,093.0   (mgal)                       NAVD 88
 HV1460
 HV1460  VERT ORDER      -  SECOND    CLASS 0
 HV1460
 HV1460.The horizontal coordinates were scaled from a map and have
 HV1460.an estimated accuracy of +/- 6 seconds.
 HV1460
 HV1460.The orthometric height was determined by differential leveling and
 HV1460.adjusted by the NATIONAL GEODETIC SURVEY
 HV1460.in June 1991.
 HV1460
 HV1460.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1460.GEOID18 height accuracy estimate available here.
 HV1460
 HV1460.Click photographs - Photos may exist for this station.
 HV1460
 HV1460.The dynamic height is computed by dividing the NAVD 88
 HV1460.geopotential number by the normal gravity value computed on the
 HV1460.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1460.degrees latitude (g = 980.6199 gals.).
 HV1460
 HV1460.The modeled gravity was interpolated from observed gravity values.
 HV1460
 HV1460
 HV1460_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ306069(NAD 83)
 HV1460
 HV1460                          SUPERSEDED SURVEY CONTROL
 HV1460
 HV1460  NGVD 29 (11/26/84)   13.930  (m)           45.70   (f) ADJUSTED    2 0
 HV1460
 HV1460.Superseded values are not recommended for survey control.
 HV1460
 HV1460.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1460.See file dsdata.pdf to determine how the superseded data were derived.
 HV1460
 HV1460_MARKER: DD = SURVEY DISK
 HV1460_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1460_SP_SET: ABUTMENT
 HV1460_STAMPING: J 4 1961
 HV1460_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1460
 HV1460  HISTORY     - Date     Condition        Report By
 HV1460  HISTORY     - 1961     MONUMENTED       DCDHT
 HV1460  HISTORY     - 1961     GOOD             CGS
 HV1460
 HV1460                          STATION DESCRIPTION
 HV1460
 HV1460'DESCRIBED BY COAST AND GEODETIC SURVEY 1961
 HV1460'AT WASHINGTON DC.
 HV1460'IN NE WASHINGTON, AT THE KENILWORTH AVE., BENNING RD,
 HV1460'INTERCHANGE, NE OF BENNING ROAD AT A BRIDGE OVER THE SW BOUND
 HV1460'TRAFFIC LANE OF KENILWORTH AVE.  (THIS BRIDGE IS PART OF THE RAMP
 HV1460'CARRYING THE NE BOUND TRAFFIC ON KENILWORTH AVE. TO THE NW BOUND
 HV1460'TRAFFIC ON BENNING ROAD), IN THE ABUTMENT AT THE S CORNER OF THE
 HV1460'BRIDGE, 3 FEET FROM THE CURB AND 3 FEET FROM THE CENTER OF A
 HV1460'METER COVER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1835 ***********************************************************************
 HV1835  DESIGNATION -  J 5
 HV1835  PID         -  HV1835
 HV1835  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1835  COUNTRY     -  US
 HV1835  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1835
 HV1835                         *CURRENT SURVEY CONTROL
 HV1835  ______________________________________________________________________
 HV1835* NAD 83(1986) POSITION- 38 53 22.     (N) 077 01 47.     (W)   SCALED
 HV1835* NAVD 88 ORTHO HEIGHT -     8.584 (meters)       28.16  (feet) ADJUSTED
 HV1835  ______________________________________________________________________
 HV1835  GEOID HEIGHT    -        -32.096 (meters)                     GEOID18
 HV1835  DYNAMIC HEIGHT  -          8.579 (meters)       28.15  (feet) COMP
 HV1835  MODELED GRAVITY -    980,098.6   (mgal)                       NAVD 88
 HV1835
 HV1835  VERT ORDER      -  FIRST     CLASS I
 HV1835
 HV1835.The horizontal coordinates were scaled from a map and have
 HV1835.an estimated accuracy of +/- 6 seconds.
 HV1835
 HV1835.The orthometric height was determined by differential leveling and
 HV1835.adjusted by the NATIONAL GEODETIC SURVEY
 HV1835.in June 1991.
 HV1835
 HV1835.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1835.GEOID18 height accuracy estimate available here.
 HV1835
 HV1835.Click photographs - Photos may exist for this station.
 HV1835
 HV1835.The dynamic height is computed by dividing the NAVD 88
 HV1835.geopotential number by the normal gravity value computed on the
 HV1835.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1835.degrees latitude (g = 980.6199 gals.).
 HV1835
 HV1835.The modeled gravity was interpolated from observed gravity values.
 HV1835
 HV1835
 HV1835_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ239064(NAD 83)
 HV1835
 HV1835                          SUPERSEDED SURVEY CONTROL
 HV1835
 HV1835  NGVD 29 (11/26/84)    8.820  (m)           28.94   (f) ADJUSTED    1 1
 HV1835
 HV1835.Superseded values are not recommended for survey control.
 HV1835
 HV1835.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1835.See file dsdata.pdf to determine how the superseded data were derived.
 HV1835
 HV1835_MARKER: DB = BENCH MARK DISK
 HV1835_SETTING: 47 = GALVANIZED STEEL PIPE W/O SLEEVE (10 FT.+)
 HV1835_STAMPING: J 5 1971
 HV1835_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1835
 HV1835  HISTORY     - Date     Condition        Report By
 HV1835  HISTORY     - 1971     MONUMENTED       NGS
 HV1835  HISTORY     - 20040612 MARK NOT FOUND   NGS
 HV1835
 HV1835                          STATION DESCRIPTION
 HV1835
 HV1835'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1835'AT WASHINGTON.
 HV1835'AT WASHINGTON, D.C., ABOUT 0.1 MILE SOUTH OF THE MAIN
 HV1835'ENTRANCE TO THE MUSEUM OF HISTORY AND TECHNOLOGY AT THE
 HV1835'SMITHSONIAN INSTITUTE, IN THE MALL BETWEEN WASHINGTON DRIVE AND
 HV1835'ADAMS DRIVE, 42.8 FEET EAST OF THE EAST EDGE OF A CONCRETE
 HV1835'CURB OF SW 13TH STREET, 78.8 FEET SOUTH AND ACROSS WASHINGTON
 HV1835'DRIVE FROM A LIGHT POLE, 64.2 FEET NORTH-NORTHEAST OF THE CENTER
 HV1835'OF A METAL MANHOLE COVER, 38.5 FEET SOUTHWEST OF THE SOUTHWEST
 HV1835'CORNER OF A CONCRETE FOUNDATION AROUND A LARGE METAL MANHOLE,
 HV1835'21.5 FEET EAST OF THE EAST EDGE OF A SIDEWALK, 20.9 FEET
 HV1835'SOUTH OF THE SOUTH EDGE OF THE SOUTH CONCRETE CURB OF
 HV1835'WASHINGTON DRIVE, AND ON THE TOP OF A COPPER COATED ROD WHICH
 HV1835'IS 5 INCHES BELOW THE SURFACE OF THE GROUND AND IS PROTECTED BY
 HV1835'A 6-INCH PIPE WHICH IS 4 INCHES BELOW THE SURFACE OF THE GROUND.
 HV1835'THE ROD WAS DRIVEN TO REFUSAL AT A DEPTH OF 23 FEET.
 HV1835
 HV1835                          STATION RECOVERY (2004)
 HV1835
 HV1835'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2004 (DW)
 HV1835'TOO MANY REFERENCES ARE GONE TO LOCATE MARK FROM DESCRIPTION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DO9453 ***********************************************************************
 DO9453  DESIGNATION -  JBAB1
 DO9453  PID         -  DO9453
 DO9453  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DO9453  COUNTRY     -  US
 DO9453  USGS QUAD   -  ALEXANDRIA (2019)
 DO9453
 DO9453                         *CURRENT SURVEY CONTROL
 DO9453  ______________________________________________________________________
 DO9453* NAD 83(2011) POSITION- 38 51 47.18035(N) 077 00 22.79148(W)   ADJUSTED
 DO9453* NAD 83(2011) ELLIP HT-   -31.062 (meters)        (09/09/13)   ADJUSTED
 DO9453* NAD 83(2011) EPOCH   -  2010.00
 DO9453* NAVD 88 ORTHO HEIGHT -     1.1   (meters)        4.    (feet) GPS OBS
 DO9453  ______________________________________________________________________
 DO9453  NAVD 88 orthometric height was determined with geoid model    GEOID12A
 DO9453  GEOID HEIGHT    -        -32.180 (meters)                     GEOID12A
 DO9453  GEOID HEIGHT    -        -32.182 (meters)                     GEOID18
 DO9453  NAD 83(2011) X  -  1,118,113.109 (meters)                     COMP
 DO9453  NAD 83(2011) Y  - -4,845,522.628 (meters)                     COMP
 DO9453  NAD 83(2011) Z  -  3,980,475.666 (meters)                     COMP
 DO9453  LAPLACE CORR    -         -2.95  (seconds)                    DEFLEC18
 DO9453
 DO9453  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 DO9453  Standards:
 DO9453         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 DO9453            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 DO9453  -------------------------------------------------------------------
 DO9453  NETWORK    1.02   2.29           0.47   0.34   1.17      0.09469664
 DO9453  -------------------------------------------------------------------
 DO9453  Click here for local accuracies and other accuracy information.
 DO9453
 DO9453.The horizontal coordinates were established by GPS observations
 DO9453.and adjusted by the GEOMETRICS GPS INCORPORATED in September 2013.
 DO9453
 DO9453.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 DO9453.been affixed to the stable North American tectonic plate. See 
 DO9453.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 DO9453
 DO9453.The horizontal coordinates are valid at the epoch date displayed above
 DO9453.which is a decimal equivalence of Year/Month/Day.
 DO9453
 DO9453.The orthometric height was determined by GPS observations and a
 DO9453.high-resolution geoid model.
 DO9453
 DO9453.Significant digits in the geoid height do not necessarily reflect accuracy.
 DO9453.GEOID18 height accuracy estimate available here.
 DO9453
 DO9453.Click photographs - Photos may exist for this station.
 DO9453
 DO9453.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 DO9453
 DO9453.The Laplace correction was computed from DEFLEC18 derived deflections.
 DO9453
 DO9453.The ellipsoidal height was determined by GPS observations
 DO9453.and is referenced to NAD 83.
 DO9453
 DO9453. The following values were computed from the NAD 83(2011) position.
 DO9453
 DO9453;                    North         East     Units Scale Factor Converg.
 DO9453;UTM  18      - 4,303,498.247   325,926.366   MT  0.99997314   -1 15 33.2
 DO9453
 DO9453!             -  Elev Factor  x  Scale Factor =   Combined Factor
 DO9453!UTM  18      -   1.00000487  x   0.99997314  =   0.99997801
 DO9453
 DO9453_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2592603498(NAD 83)
 DO9453
 DO9453|---------------------------------------------------------------------|
 DO9453| PID    Reference Object                     Distance      Geod. Az  |
 DO9453|                                                           dddmmss.s |
 DO9453| DO9454 JBAB2                               209.804 METERS 14521     |
 DO9453|---------------------------------------------------------------------|
 DO9453
 DO9453                          SUPERSEDED SURVEY CONTROL
 DO9453
 DO9453.No superseded survey control is available for this station.
 DO9453
 DO9453_MARKER: DD = SURVEY DISK
 DO9453_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DO9453_STAMPING: JBAB1 2013
 DO9453_MARK LOGO: USN
 DO9453_PROJECTION: FLUSH
 DO9453_MAGNETIC: N = NO MAGNETIC MATERIAL
 DO9453_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DO9453+STABILITY: SURFACE MOTION
 DO9453_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 DO9453+SATELLITE: SATELLITE OBSERVATIONS - June 11, 2013
 DO9453
 DO9453  HISTORY     - Date     Condition        Report By
 DO9453  HISTORY     - 20130611 MONUMENTED       GEOMET
 DO9453
 DO9453                          STATION DESCRIPTION
 DO9453
 DO9453'DESCRIBED BY GEOMETRICS GPS INCORPORATED 2013 (DWB)
 DO9453'THE STATION IS LOCATED ABOUT 28.5 MI (45.9 KM) WEST OF ANNAPOLIS
 DO9453'MARYLAND, 15.9 MI (25.6 KM) EAST OF FAIRFAX, VIRGINIA.  10.42 MI (16.8
 DO9453'KM) SOUTHEAST OF MCLEAN, VIRGINIA.
 DO9453'
 DO9453'TO REACH FROM THE INTERSECTION OF SOUTH CAPITOL STREET SOUTHWEST AND
 DO9453'FIRTH STERLING AVENUE SOUTHEAST, GO WEST ON DEFENSE BOULEVARD 0.09 MI
 DO9453'(0.1 KM) TO AN INTERSECTION WITH MITSCHER ROAD.  TURN RIGHT AND GO
 DO9453'NORTHWEST 0.20 MI (0.3 KM) TO AN INTERSECTION WITH ROBBINS ROAD AND
 DO9453'THE STATION ON THE LEFT.
 DO9453'
 DO9453'THE STATION IS A DISK STAMPED --JBAB1-- SET IN A ROUND CONCRETE
 DO9453'MONUMENT 1.2 M (3.9 FT) DEEP AND 0.3 M (1.0 FT) IN DIAMETER.  THE MARK
 DO9453'IS SET FLUSH WITH THE GROUND.  THE MARK IS 18 FT (5.5 M) NORTHWEST OF
 DO9453'A DRAIN INLET, 36 FT (11.0 M) NORTHEAST FROM A DRAIN INLET, 68 FT
 DO9453'(20.7 M) SOUTHEAST OF A DRAIN INLET, 27 FT (8.2 M) SOUTHEAST OF A
 DO9453'SIDEWALK CORNER, 69 FT (21.0 M) SOUTHWEST OF A STREET SIGN, 42 FT
 DO9453'(12.8 M) SOUTHEAST OF THE CENTERLINE OF ROBBINS ROAD, 28 FT (8.5 M)
 DO9453'SOUTHWEST OF THE CENTERLINE OF MITSCHER ROAD.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DO9454 ***********************************************************************
 DO9454  DESIGNATION -  JBAB2
 DO9454  PID         -  DO9454
 DO9454  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DO9454  COUNTRY     -  US
 DO9454  USGS QUAD   -  ALEXANDRIA (2019)
 DO9454
 DO9454                         *CURRENT SURVEY CONTROL
 DO9454  ______________________________________________________________________
 DO9454* NAD 83(2011) POSITION- 38 51 41.58298(N) 077 00 17.84450(W)   ADJUSTED
 DO9454* NAD 83(2011) ELLIP HT-   -31.495 (meters)        (09/09/13)   ADJUSTED
 DO9454* NAD 83(2011) EPOCH   -  2010.00
 DO9454* NAVD 88 ORTHO HEIGHT -     0.7   (meters)        2.    (feet) GPS OBS
 DO9454  ______________________________________________________________________
 DO9454  NAVD 88 orthometric height was determined with geoid model    GEOID12A
 DO9454  GEOID HEIGHT    -        -32.184 (meters)                     GEOID12A
 DO9454  GEOID HEIGHT    -        -32.186 (meters)                     GEOID18
 DO9454  NAD 83(2011) X  -  1,118,253.600 (meters)                     COMP
 DO9454  NAD 83(2011) Y  - -4,845,601.009 (meters)                     COMP
 DO9454  NAD 83(2011) Z  -  3,980,340.994 (meters)                     COMP
 DO9454  LAPLACE CORR    -         -2.88  (seconds)                    DEFLEC18
 DO9454
 DO9454  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 DO9454  Standards:
 DO9454         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 DO9454            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 DO9454  -------------------------------------------------------------------
 DO9454  NETWORK    1.03   2.29           0.48   0.34   1.17      0.09872509
 DO9454  -------------------------------------------------------------------
 DO9454  Click here for local accuracies and other accuracy information.
 DO9454
 DO9454.The horizontal coordinates were established by GPS observations
 DO9454.and adjusted by the GEOMETRICS GPS INCORPORATED in September 2013.
 DO9454
 DO9454.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 DO9454.been affixed to the stable North American tectonic plate. See 
 DO9454.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 DO9454
 DO9454.The horizontal coordinates are valid at the epoch date displayed above
 DO9454.which is a decimal equivalence of Year/Month/Day.
 DO9454
 DO9454.The orthometric height was determined by GPS observations and a
 DO9454.high-resolution geoid model.
 DO9454
 DO9454.Significant digits in the geoid height do not necessarily reflect accuracy.
 DO9454.GEOID18 height accuracy estimate available here.
 DO9454
 DO9454.Click photographs - Photos may exist for this station.
 DO9454
 DO9454.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 DO9454
 DO9454.The Laplace correction was computed from DEFLEC18 derived deflections.
 DO9454
 DO9454.The ellipsoidal height was determined by GPS observations
 DO9454.and is referenced to NAD 83.
 DO9454
 DO9454. The following values were computed from the NAD 83(2011) position.
 DO9454
 DO9454;                    North         East     Units Scale Factor Converg.
 DO9454;UTM  18      - 4,303,323.068   326,041.812   MT  0.99997265   -1 15 29.9
 DO9454
 DO9454!             -  Elev Factor  x  Scale Factor =   Combined Factor
 DO9454!UTM  18      -   1.00000494  x   0.99997265  =   0.99997759
 DO9454
 DO9454_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2604103323(NAD 83)
 DO9454
 DO9454|---------------------------------------------------------------------|
 DO9454| PID    Reference Object                     Distance      Geod. Az  |
 DO9454|                                                           dddmmss.s |
 DO9454| DO9453 JBAB1                               209.804 METERS 32521     |
 DO9454|---------------------------------------------------------------------|
 DO9454
 DO9454                          SUPERSEDED SURVEY CONTROL
 DO9454
 DO9454.No superseded survey control is available for this station.
 DO9454
 DO9454_MARKER: DD = SURVEY DISK
 DO9454_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DO9454_STAMPING: JBAB2 2013
 DO9454_MARK LOGO: USN
 DO9454_PROJECTION: FLUSH
 DO9454_MAGNETIC: N = NO MAGNETIC MATERIAL
 DO9454_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DO9454+STABILITY: SURFACE MOTION
 DO9454_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 DO9454+SATELLITE: SATELLITE OBSERVATIONS - June 11, 2013
 DO9454
 DO9454  HISTORY     - Date     Condition        Report By
 DO9454  HISTORY     - 20130611 MONUMENTED       GEOMET
 DO9454
 DO9454                          STATION DESCRIPTION
 DO9454
 DO9454'DESCRIBED BY GEOMETRICS GPS INCORPORATED 2013 (DWB)
 DO9454'THE STATION IS LOCATED ABOUT 28.5 MI (45.9 KM) WEST OF ANNAPOLIS
 DO9454'MARYLAND, 15.9 MI (25.6 KM) EAST OF FAIRFAX, VIRGINIA.  10.42 MI (16.8
 DO9454'KM) SOUTHEAST OF MCLEAN, VIRGINIA.
 DO9454'
 DO9454'TO REACH FROM THE INTERSECTION OF SOUTH CAPITOL STREET SOUTHWEST AND
 DO9454'FIRTH STERLING AVENUE SOUTHEAST, GO WEST ON DEFENSE BOULEVARD 0.09 MI
 DO9454'(0.1 KM) TO AN INTERSECTION WITH MITSCHER ROAD.  TURN RIGHT AND GO
 DO9454'NORTHEAST 0.01 MI (0.0 KM) TO THE STATION ON THE LEFT.
 DO9454'
 DO9454'THE STATION IS A DISK STAMPED --JBAB2-- SET IN A ROUND CONCRETE
 DO9454'MONUMENT 1.2 M (3.9 FT) DEEP AND 0.3 M (1.0 FT) IN DIAMETER.  THE MARK
 DO9454'IS SET FLUSH WITH THE GROUND.  THE MARK IS 32 FT (9.8 M) NORTH OF A
 DO9454'STOP SIGN, 62.5 FT (19.1 M) SOUTHEAST OF A DRAIN INLET, 34 FT (10.4 M)
 DO9454'EAST OF THE EASTERN CORNER OF AN AIRPLANES CONCRETE BASE, 38.5 FT
 DO9454'(11.7 M) NORTHEAST OF A LAMP, 55.8 FT (17.0 M) NORTHEAST OF A LAMP, 65
 DO9454'FT (19.8 M) NORTHEAST OF A LAMP POST, 25 FT (7.6 M) WEST OF THE
 DO9454'CENTERLINE OF MITSCHER ROAD, 48 FT (14.6 M) NORTH OF THE CENTERLINE OF
 DO9454'DEFENSE BOULEVARD.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DO9455 ***********************************************************************
 DO9455  DESIGNATION -  JBAB3
 DO9455  PID         -  DO9455
 DO9455  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DO9455  COUNTRY     -  US
 DO9455  USGS QUAD   -  ALEXANDRIA (2019)
 DO9455
 DO9455                         *CURRENT SURVEY CONTROL
 DO9455  ______________________________________________________________________
 DO9455* NAD 83(2011) POSITION- 38 49 58.64137(N) 077 01 22.93690(W)   ADJUSTED
 DO9455* NAD 83(2011) ELLIP HT-   -29.198 (meters)        (09/09/13)   ADJUSTED
 DO9455* NAD 83(2011) EPOCH   -  2010.00
 DO9455* NAVD 88 ORTHO HEIGHT -     3.0   (meters)       10.    (feet) GPS OBS
 DO9455  ______________________________________________________________________
 DO9455  NAVD 88 orthometric height was determined with geoid model    GEOID12A
 DO9455  GEOID HEIGHT    -        -32.205 (meters)                     GEOID12A
 DO9455  GEOID HEIGHT    -        -32.202 (meters)                     GEOID18
 DO9455  NAD 83(2011) X  -  1,117,171.910 (meters)                     COMP
 DO9455  NAD 83(2011) Y  - -4,847,895.670 (meters)                     COMP
 DO9455  NAD 83(2011) Z  -  3,977,870.164 (meters)                     COMP
 DO9455  LAPLACE CORR    -         -2.75  (seconds)                    DEFLEC18
 DO9455
 DO9455  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 DO9455  Standards:
 DO9455         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 DO9455            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 DO9455  -------------------------------------------------------------------
 DO9455  NETWORK    1.03   2.63           0.45   0.39   1.34      0.10025946
 DO9455  -------------------------------------------------------------------
 DO9455  Click here for local accuracies and other accuracy information.
 DO9455
 DO9455.The horizontal coordinates were established by GPS observations
 DO9455.and adjusted by the GEOMETRICS GPS INCORPORATED in September 2013.
 DO9455
 DO9455.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 DO9455.been affixed to the stable North American tectonic plate. See 
 DO9455.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 DO9455
 DO9455.The horizontal coordinates are valid at the epoch date displayed above
 DO9455.which is a decimal equivalence of Year/Month/Day.
 DO9455
 DO9455.The orthometric height was determined by GPS observations and a
 DO9455.high-resolution geoid model.
 DO9455
 DO9455.Significant digits in the geoid height do not necessarily reflect accuracy.
 DO9455.GEOID18 height accuracy estimate available here.
 DO9455
 DO9455.Click photographs - Photos may exist for this station.
 DO9455
 DO9455.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 DO9455
 DO9455.The Laplace correction was computed from DEFLEC18 derived deflections.
 DO9455
 DO9455.The ellipsoidal height was determined by GPS observations
 DO9455.and is referenced to NAD 83.
 DO9455
 DO9455. The following values were computed from the NAD 83(2011) position.
 DO9455
 DO9455;                    North         East     Units Scale Factor Converg.
 DO9455;UTM  18      - 4,300,184.137   324,402.557   MT  0.99997971   -1 16 07.9
 DO9455
 DO9455!             -  Elev Factor  x  Scale Factor =   Combined Factor
 DO9455!UTM  18      -   1.00000458  x   0.99997971  =   0.99998429
 DO9455
 DO9455:                Primary Azimuth Mark                     Grid Az
 DO9455:UTM  18      -  JBAB5                                    200 55 53.0
 DO9455
 DO9455_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2440200184(NAD 83)
 DO9455
 DO9455|---------------------------------------------------------------------|
 DO9455| PID    Reference Object                     Distance      Geod. Az  |
 DO9455|                                                           dddmmss.s |
 DO9455| DO9456 JBAB4                               194.332 METERS 05453     |
 DO9455| DO9457 JBAB5                               495.985 METERS 1993945.1 |
 DO9455|---------------------------------------------------------------------|
 DO9455
 DO9455                          SUPERSEDED SURVEY CONTROL
 DO9455
 DO9455.No superseded survey control is available for this station.
 DO9455
 DO9455_MARKER: DD = SURVEY DISK
 DO9455_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DO9455_STAMPING: JBAB3 2013
 DO9455_MARK LOGO: USN
 DO9455_PROJECTION: FLUSH
 DO9455_MAGNETIC: N = NO MAGNETIC MATERIAL
 DO9455_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DO9455+STABILITY: SURFACE MOTION
 DO9455_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 DO9455+SATELLITE: SATELLITE OBSERVATIONS - March 27, 2013
 DO9455
 DO9455  HISTORY     - Date     Condition        Report By
 DO9455  HISTORY     - 20130327 MONUMENTED       GEOMET
 DO9455
 DO9455                          STATION DESCRIPTION
 DO9455
 DO9455'DESCRIBED BY GEOMETRICS GPS INCORPORATED 2013 (DWB)
 DO9455'THE STATION IS LOCATED ABOUT 30.4 MI (48.9 KM) WEST OF ANNAPOLIS
 DO9455'MARYLAND, 15.3 MI (24.6 KM) EAST OF FAIRFAX, VIRGINIA.  10.7 MI (17.2
 DO9455'KM) SOUTHEAST OF MCLEAN, VIRGINIA.
 DO9455'
 DO9455'TO REACH FROM THE INTERSECTION OF INTERSTATE 295 AND OVERLOOK AVENUE
 DO9455'SOUTHWEST, GO NORTH ON OVERLOOK AVENUE SOUTHWEST 0.52 MI (0.8 KM) TO
 DO9455'CHAPPIE JAMES BOULEVARD.  TURN LEFT AND GO 0.40 MI (0.6 KM) NORTHWEST
 DO9455'TO ARNOLD AVENUE SOUTHWEST.  TURN LEFT AND GO 0.08 MI (0.1 KM) WEST TO
 DO9455'MCQUIRE AVENUE SOUTHEAST ON THE LEFT.  TURN LEFT AND GO 0.09 MI (0.1
 DO9455'KM) SOUTH TO THE STATION ON THE LEFT.
 DO9455'
 DO9455'THE STATION IS A DISK STAMPED --JBAB3-- SET IN A ROUND CONCRETE
 DO9455'MONUMENT 1.2 M (3.9 FT) DEEP AND 0.3 M (1.0 FT) IN DIAMETER.  THE MARK
 DO9455'IS SET FLUSH WITH THE GROUND.  THE MARK IS 15.0 FT (4.6 M) NORTH OF A
 DO9455'MANHOLE, 40.0 FT (12.2 M) SOUTHEAST OF A LAMP POST, 20.3 FT (6.2 M)
 DO9455'SOUTHWEST OF THE CORNER OF THE SIDEWALK, 40.0 FT (12.2 M) NORTHWEST OF
 DO9455'A MANHOLE, 10.5 FT (3.2 M) NORTHWEST OF A DRAIN INLET.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DO9456 ***********************************************************************
 DO9456  DESIGNATION -  JBAB4
 DO9456  PID         -  DO9456
 DO9456  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DO9456  COUNTRY     -  US
 DO9456  USGS QUAD   -  ALEXANDRIA (2019)
 DO9456
 DO9456                         *CURRENT SURVEY CONTROL
 DO9456  ______________________________________________________________________
 DO9456* NAD 83(2011) POSITION- 38 50 02.26623(N) 077 01 16.34601(W)   ADJUSTED
 DO9456* NAD 83(2011) ELLIP HT-   -28.258 (meters)        (09/09/13)   ADJUSTED
 DO9456* NAD 83(2011) EPOCH   -  2010.00
 DO9456* NAVD 88 ORTHO HEIGHT -     3.9   (meters)       13.    (feet) GPS OBS
 DO9456  ______________________________________________________________________
 DO9456  NAVD 88 orthometric height was determined with geoid model    GEOID12A
 DO9456  GEOID HEIGHT    -        -32.206 (meters)                     GEOID12A
 DO9456  GEOID HEIGHT    -        -32.203 (meters)                     GEOID18
 DO9456  NAD 83(2011) X  -  1,117,311.239 (meters)                     COMP
 DO9456  NAD 83(2011) Y  - -4,847,792.383 (meters)                     COMP
 DO9456  NAD 83(2011) Z  -  3,977,957.825 (meters)                     COMP
 DO9456  LAPLACE CORR    -         -2.76  (seconds)                    DEFLEC18
 DO9456
 DO9456  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 DO9456  Standards:
 DO9456         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 DO9456            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 DO9456  -------------------------------------------------------------------
 DO9456  NETWORK    1.03   2.63           0.45   0.39   1.34      0.09324451
 DO9456  -------------------------------------------------------------------
 DO9456  Click here for local accuracies and other accuracy information.
 DO9456
 DO9456.The horizontal coordinates were established by GPS observations
 DO9456.and adjusted by the GEOMETRICS GPS INCORPORATED in September 2013.
 DO9456
 DO9456.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 DO9456.been affixed to the stable North American tectonic plate. See 
 DO9456.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 DO9456
 DO9456.The horizontal coordinates are valid at the epoch date displayed above
 DO9456.which is a decimal equivalence of Year/Month/Day.
 DO9456
 DO9456.The orthometric height was determined by GPS observations and a
 DO9456.high-resolution geoid model.
 DO9456
 DO9456.Significant digits in the geoid height do not necessarily reflect accuracy.
 DO9456.GEOID18 height accuracy estimate available here.
 DO9456
 DO9456.Click photographs - Photos may exist for this station.
 DO9456
 DO9456.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 DO9456
 DO9456.The Laplace correction was computed from DEFLEC18 derived deflections.
 DO9456
 DO9456.The ellipsoidal height was determined by GPS observations
 DO9456.and is referenced to NAD 83.
 DO9456
 DO9456. The following values were computed from the NAD 83(2011) position.
 DO9456
 DO9456;                    North         East     Units Scale Factor Converg.
 DO9456;UTM  18      - 4,300,292.368   324,563.956   MT  0.99997901   -1 16 03.9
 DO9456
 DO9456!             -  Elev Factor  x  Scale Factor =   Combined Factor
 DO9456!UTM  18      -   1.00000443  x   0.99997901  =   0.99998344
 DO9456
 DO9456:                Primary Azimuth Mark                     Grid Az
 DO9456:UTM  18      -  JBAB6                                    179 56 07.6
 DO9456
 DO9456_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2456300292(NAD 83)
 DO9456
 DO9456|---------------------------------------------------------------------|
 DO9456| PID    Reference Object                     Distance      Geod. Az  |
 DO9456|                                                           dddmmss.s |
 DO9456| DO9458 JBAB6                               APPROX. 0.5 KM 1784003.7 |
 DO9456|---------------------------------------------------------------------|
 DO9456
 DO9456                          SUPERSEDED SURVEY CONTROL
 DO9456
 DO9456.No superseded survey control is available for this station.
 DO9456
 DO9456_MARKER: DD = SURVEY DISK
 DO9456_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DO9456_STAMPING: JBAB4 2013
 DO9456_MARK LOGO: USN
 DO9456_PROJECTION: FLUSH
 DO9456_MAGNETIC: N = NO MAGNETIC MATERIAL
 DO9456_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DO9456+STABILITY: SURFACE MOTION
 DO9456_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 DO9456+SATELLITE: SATELLITE OBSERVATIONS - March 27, 2013
 DO9456
 DO9456  HISTORY     - Date     Condition        Report By
 DO9456  HISTORY     - 20130327 MONUMENTED       GEOMET
 DO9456
 DO9456                          STATION DESCRIPTION
 DO9456
 DO9456'DESCRIBED BY GEOMETRICS GPS INCORPORATED 2013 (DWB)
 DO9456'THE STATION IS LOCATED ABOUT 30.4 MI (48.9 KM) WEST OF ANNAPOLIS
 DO9456'MARYLAND, 15.3 MI (24.6 KM) EAST OF FAIRFAX, VIRGINIA.  10.7 MI (17.2
 DO9456'KM) SOUTHEAST OF MCLEAN, VIRGINIA.
 DO9456'
 DO9456'TO REACH FROM THE INTERSECTION OF INTERSTATE 295 AND OVERLOOK AVENUE
 DO9456'SOUTHWEST, GO NORTH ON OVERLOOK AVENUE SOUTHWEST 0.52 MI (0.8 KM) TO
 DO9456'CHAPPIE JAMES BOULEVARD.  TURN LEFT AND GO 0.40 MI (0.6 KM) NORTHWEST
 DO9456'TO ARNOLD AVENUE SOUTHWEST AND THE STATION ON THE LEFT.
 DO9456'
 DO9456'THE STATION IS A DISK STAMPED --JBAB4-- SET IN A ROUND CONCRETE
 DO9456'MONUMENT 1.2 M (3.9 FT) DEEP AND 0.3 M (1.0 FT) IN DIAMETER.  THE MARK
 DO9456'IS SET FLUSH WITH THE GROUND.  THE MARK IS 17.6 FT (5.4 M) SOUTHEAST
 DO9456'OF A LIGHT POLE, 16.6 FT (5.1 M) SOUTHEAST OF A SQUARE MANHOLE, 52.0
 DO9456'FT (15.8 M) NORTH OF A 4 INCH (10 CM) OAK TREE, 78.0 FT (23.8 M)
 DO9456'NORTHEAST OF THE NORTHEASTERN CORNER OF A TRANSFORMER PAD, 42.0 FT
 DO9456'(12.8 M) SOUTHEAST OF A MANHOLE, 6.5 FT (2.0 M) NORTHEAST OF THE
 DO9456'SIDEWALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DO9457 ***********************************************************************
 DO9457  DESIGNATION -  JBAB5
 DO9457  PID         -  DO9457
 DO9457  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DO9457  COUNTRY     -  US
 DO9457  USGS QUAD   -  ALEXANDRIA (2019)
 DO9457
 DO9457                         *CURRENT SURVEY CONTROL
 DO9457  ______________________________________________________________________
 DO9457* NAD 83(2011) POSITION- 38 49 43.49495(N) 077 01 29.85578(W)   ADJUSTED
 DO9457* NAD 83(2011) ELLIP HT-   -28.473 (meters)        (09/09/13)   ADJUSTED
 DO9457* NAD 83(2011) EPOCH   -  2010.00
 DO9457* NAVD 88 ORTHO HEIGHT -     3.7   (meters)       12.    (feet) GPS OBS
 DO9457  ______________________________________________________________________
 DO9457  NAVD 88 orthometric height was determined with geoid model    GEOID12A
 DO9457  GEOID HEIGHT    -        -32.209 (meters)                     GEOID12A
 DO9457  GEOID HEIGHT    -        -32.207 (meters)                     GEOID18
 DO9457  NAD 83(2011) X  -  1,117,075.175 (meters)                     COMP
 DO9457  NAD 83(2011) Y  - -4,848,219.075 (meters)                     COMP
 DO9457  NAD 83(2011) Z  -  3,977,506.775 (meters)                     COMP
 DO9457  LAPLACE CORR    -         -2.79  (seconds)                    DEFLEC18
 DO9457
 DO9457  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 DO9457  Standards:
 DO9457         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 DO9457            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 DO9457  -------------------------------------------------------------------
 DO9457  NETWORK    1.12   2.63           0.47   0.44   1.34      0.15934128
 DO9457  -------------------------------------------------------------------
 DO9457  Click here for local accuracies and other accuracy information.
 DO9457
 DO9457.The horizontal coordinates were established by GPS observations
 DO9457.and adjusted by the GEOMETRICS GPS INCORPORATED in September 2013.
 DO9457
 DO9457.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 DO9457.been affixed to the stable North American tectonic plate. See 
 DO9457.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 DO9457
 DO9457.The horizontal coordinates are valid at the epoch date displayed above
 DO9457.which is a decimal equivalence of Year/Month/Day.
 DO9457
 DO9457.The orthometric height was determined by GPS observations and a
 DO9457.high-resolution geoid model.
 DO9457
 DO9457.Significant digits in the geoid height do not necessarily reflect accuracy.
 DO9457.GEOID18 height accuracy estimate available here.
 DO9457
 DO9457.Click photographs - Photos may exist for this station.
 DO9457
 DO9457.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 DO9457
 DO9457.The Laplace correction was computed from DEFLEC18 derived deflections.
 DO9457
 DO9457.The ellipsoidal height was determined by GPS observations
 DO9457.and is referenced to NAD 83.
 DO9457
 DO9457. The following values were computed from the NAD 83(2011) position.
 DO9457
 DO9457;                    North         East     Units Scale Factor Converg.
 DO9457;UTM  18      - 4,299,720.892   324,225.370   MT  0.99998047   -1 16 11.9
 DO9457
 DO9457!             -  Elev Factor  x  Scale Factor =   Combined Factor
 DO9457!UTM  18      -   1.00000447  x   0.99998047  =   0.99998494
 DO9457
 DO9457:                Primary Azimuth Mark                     Grid Az
 DO9457:UTM  18      -  JBAB3                                    020 55 52.7
 DO9457
 DO9457_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2422599720(NAD 83)
 DO9457
 DO9457|---------------------------------------------------------------------|
 DO9457| PID    Reference Object                     Distance      Geod. Az  |
 DO9457|                                                           dddmmss.s |
 DO9457| DO9455 JBAB3                               495.985 METERS 0193940.8 |
 DO9457|---------------------------------------------------------------------|
 DO9457
 DO9457                          SUPERSEDED SURVEY CONTROL
 DO9457
 DO9457.No superseded survey control is available for this station.
 DO9457
 DO9457_MARKER: DD = SURVEY DISK
 DO9457_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DO9457_STAMPING: JBAB5 2013
 DO9457_MARK LOGO: USN
 DO9457_PROJECTION: FLUSH
 DO9457_MAGNETIC: N = NO MAGNETIC MATERIAL
 DO9457_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DO9457+STABILITY: SURFACE MOTION
 DO9457_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 DO9457+SATELLITE: SATELLITE OBSERVATIONS - March 27, 2013
 DO9457
 DO9457  HISTORY     - Date     Condition        Report By
 DO9457  HISTORY     - 20130327 MONUMENTED       GEOMET
 DO9457
 DO9457                          STATION DESCRIPTION
 DO9457
 DO9457'DESCRIBED BY GEOMETRICS GPS INCORPORATED 2013 (DWB)
 DO9457'THE STATION IS LOCATED ABOUT 30.6 MI (49.2 KM) WEST OF ANNAPOLIS
 DO9457'MARYLAND, 15.2 MI (24.5 KM) EAST OF FAIRFAX, VIRGINIA.  11 MI (17.7
 DO9457'KM) SOUTHEAST OF MCLEAN, VIRGINIA.
 DO9457'
 DO9457'TO REACH FROM THE INTERSECTION OF INTERSTATE 295 AND OVERLOOK AVENUE
 DO9457'SOUTHWEST, GO NORTH ON OVERLOOK AVENUE SOUTHWEST 0.52 MI (0.8 KM) TO
 DO9457'CHAPPIE JAMES BOULEVARD.  TURN LEFT AND GO 0.40 MI (0.6 KM) NORTHWEST
 DO9457'TO ARNOLD AVENUE SOUTHWEST ON THE LEFT.  TURN LEFT AND GO 0.09 MI (0.1
 DO9457'KM) WEST TO MCQUIRE AVENUE SOUTHEAST ON THE LEFT.  TURN LEFT AND GO
 DO9457'0.42 MI (0.7 KM) SOUTH TO THE STATION ON THE LEFT.
 DO9457'
 DO9457'THE STATION IS A DISK STAMPED --JBAB5-- SET IN A ROUND CONCRETE
 DO9457'MONUMENT 1.2 M (3.9 FT) DEEP AND 0.3 M (1.0 FT) IN DIAMETER.  THE MARK
 DO9457'IS SET FLUSH WITH THE GROUND.  THE MARK IS 115.0 FT (35.1 M) SOUTHEAST
 DO9457'OF A FIRE HYDRANT, 8.0 FT (2.4 M) WEST OF THE EDGE OF AN ASPHALT
 DO9457'SIDEWALK, 59.0 FT (18.0 M) NORTHWEST OF A LIGHT POLE, 66.0 FT (20.1 M)
 DO9457'NORTHWEST OF A CONCRETE VAULT, 22.0 FT (6.7 M) NORTHEAST OF A CHAIN
 DO9457'LINK FENCE, 21.0 FT (6.4 M) SOUTHWEST OF THE EDGE OF PAVEMENT ON
 DO9457'MCQUIRE AVENUE SOUTHEAST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DO9458 ***********************************************************************
 DO9458  DESIGNATION -  JBAB6
 DO9458  PID         -  DO9458
 DO9458  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DO9458  COUNTRY     -  US
 DO9458  USGS QUAD   -  ALEXANDRIA (2019)
 DO9458
 DO9458                         *CURRENT SURVEY CONTROL
 DO9458  ______________________________________________________________________
 DO9458* NAD 83(2011) POSITION- 38 49 45.13068(N) 077 01 15.83652(W)   ADJUSTED
 DO9458* NAD 83(2011) ELLIP HT-   -21.987 (meters)        (09/09/13)   ADJUSTED
 DO9458* NAD 83(2011) EPOCH   -  2010.00
 DO9458* NAVD 88 ORTHO HEIGHT -    10.2   (meters)       33.    (feet) GPS OBS
 DO9458  ______________________________________________________________________
 DO9458  NAVD 88 orthometric height was determined with geoid model    GEOID12A
 DO9458  GEOID HEIGHT    -        -32.214 (meters)                     GEOID12A
 DO9458  GEOID HEIGHT    -        -32.211 (meters)                     GEOID18
 DO9458  NAD 83(2011) X  -  1,117,398.724 (meters)                     COMP
 DO9458  NAD 83(2011) Y  - -4,848,117.245 (meters)                     COMP
 DO9458  NAD 83(2011) Z  -  3,977,550.136 (meters)                     COMP
 DO9458  LAPLACE CORR    -         -2.83  (seconds)                    DEFLEC18
 DO9458
 DO9458  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 DO9458  Standards:
 DO9458         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 DO9458            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 DO9458  -------------------------------------------------------------------
 DO9458  NETWORK    1.06   2.67           0.46   0.40   1.36      0.10308075
 DO9458  -------------------------------------------------------------------
 DO9458  Click here for local accuracies and other accuracy information.
 DO9458
 DO9458.The horizontal coordinates were established by GPS observations
 DO9458.and adjusted by the GEOMETRICS GPS INCORPORATED in September 2013.
 DO9458
 DO9458.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 DO9458.been affixed to the stable North American tectonic plate. See 
 DO9458.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 DO9458
 DO9458.The horizontal coordinates are valid at the epoch date displayed above
 DO9458.which is a decimal equivalence of Year/Month/Day.
 DO9458
 DO9458.The orthometric height was determined by GPS observations and a
 DO9458.high-resolution geoid model.
 DO9458
 DO9458.Significant digits in the geoid height do not necessarily reflect accuracy.
 DO9458.GEOID18 height accuracy estimate available here.
 DO9458
 DO9458.Click photographs - Photos may exist for this station.
 DO9458
 DO9458.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 DO9458
 DO9458.The Laplace correction was computed from DEFLEC18 derived deflections.
 DO9458
 DO9458.The ellipsoidal height was determined by GPS observations
 DO9458.and is referenced to NAD 83.
 DO9458
 DO9458. The following values were computed from the NAD 83(2011) position.
 DO9458
 DO9458;                    North         East     Units Scale Factor Converg.
 DO9458;UTM  18      - 4,299,763.832   324,564.552   MT  0.99997901   -1 16 03.1
 DO9458
 DO9458!             -  Elev Factor  x  Scale Factor =   Combined Factor
 DO9458!UTM  18      -   1.00000345  x   0.99997901  =   0.99998246
 DO9458
 DO9458:                Primary Azimuth Mark                     Grid Az
 DO9458:UTM  18      -  JBAB4                                    359 56 07.1
 DO9458
 DO9458_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2456499763(NAD 83)
 DO9458
 DO9458|---------------------------------------------------------------------|
 DO9458| PID    Reference Object                     Distance      Geod. Az  |
 DO9458|                                                           dddmmss.s |
 DO9458| DO9456 JBAB4                               APPROX. 0.5 KM 3584004.0 |
 DO9458|---------------------------------------------------------------------|
 DO9458
 DO9458                          SUPERSEDED SURVEY CONTROL
 DO9458
 DO9458.No superseded survey control is available for this station.
 DO9458
 DO9458_MARKER: DD = SURVEY DISK
 DO9458_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DO9458_STAMPING: JBAB6 2013
 DO9458_MARK LOGO: USN
 DO9458_PROJECTION: FLUSH
 DO9458_MAGNETIC: N = NO MAGNETIC MATERIAL
 DO9458_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DO9458+STABILITY: SURFACE MOTION
 DO9458_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 DO9458+SATELLITE: SATELLITE OBSERVATIONS - March 27, 2013
 DO9458
 DO9458  HISTORY     - Date     Condition        Report By
 DO9458  HISTORY     - 20130327 MONUMENTED       GEOMET
 DO9458
 DO9458                          STATION DESCRIPTION
 DO9458
 DO9458'DESCRIBED BY GEOMETRICS GPS INCORPORATED 2013 (DWB)
 DO9458'THE STATION IS LOCATED ABOUT 30.4 MI (48.9 KM) WEST OF ANNAPOLIS
 DO9458'MARYLAND, 15.3 MI (24.6 KM) EAST OF FAIRFAX, VIRGINIA.  11 MI (17.7
 DO9458'KM) SOUTHEAST OF MCLEAN, VIRGINIA.
 DO9458'
 DO9458'TO REACH FROM THE INTERSECTION OF INTERSTATE 295 AND OVERLOOK AVENUE
 DO9458'SOUTHWEST, GO NORTH ON OVERLOOK AVENUE SOUTHWEST 0.52 MI (0.8 KM) TO
 DO9458'CHAPPIE JAMES BOULEVARD.  TURN LEFT AND GO 0.40 MI (0.6 KM) NORTHWEST
 DO9458'TO ARNOLD AVENUE SOUTHWEST ON THE LEFT.  TURN LEFT AND GO 0.09 MI (0.1
 DO9458'KM) WEST TO MCQUIRE AVENUE SOUTHEAST ON THE LEFT.  TURN LEFT AND GO
 DO9458'0.64 MI (1.0 KM) EAST TO AN INTERSECTION WITH EDGIN WAY AND THE
 DO9458'STATION ON THE RIGHT.
 DO9458'
 DO9458'THE STATION IS A DISK STAMPED --JBAB6-- SET IN A ROUND CONCRETE
 DO9458'MONUMENT 1.2 M (3.9 FT) DEEP AND 0.3 M (1.0 FT) IN DIAMETER.  THE MARK
 DO9458'IS SET FLUSH WITH THE GROUND.  THE MARK IS 90.2 FT (27.5 M) SOUTH OF A
 DO9458'NO PARKING SIGN, 65.8 FT (20.1 M) NORTHEAST OF A 3 INCH (8 CM) OAK
 DO9458'TREE, 46.2 FT (14.1 M) NORTHWEST OF A STOP SIGN, 80.5 FT (24.5 M)
 DO9458'SOUTHWEST OF A ROAD SIGN, 68.8 FT (21.0 M) SOUTHEAST OF A FIRE
 DO9458'HYDRANT, 61.0 FT (18.6 M) SOUTHEAST OF A YIELD SIGN, 12.0 FT (3.7 M)
 DO9458'FROM THE EDGE OF PAVEMENT ON MCQUIRE AVENUE, 10.0 FT (3.0 M) FROM THE
 DO9458'EDGE OF PAVEMENT ON EDGIN WAY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6610 ***********************************************************************
 DL6610  DESIGNATION -  JEFFERSON MEMORIAL SOUTH
 DL6610  PID         -  DL6610
 DL6610  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6610  COUNTRY     -  US
 DL6610  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6610
 DL6610                         *CURRENT SURVEY CONTROL
 DL6610  ______________________________________________________________________
 DL6610* NAD 83(1986) POSITION- 38 52 51.04   (N) 077 02 10.40   (W)   HD_HELD1
 DL6610* NAVD 88 ORTHO HEIGHT -     3.727 (meters)       12.23  (feet) ADJUSTED
 DL6610  ______________________________________________________________________
 DL6610  GEOID HEIGHT    -        -32.104 (meters)                     GEOID18
 DL6610  DYNAMIC HEIGHT  -          3.725 (meters)       12.22  (feet) COMP
 DL6610  MODELED GRAVITY -    980,097.1   (mgal)                       NAVD 88
 DL6610
 DL6610  VERT ORDER      -  FIRST     CLASS II
 DL6610
 DL6610.The horizontal coordinates were determined by differentially corrected
 DL6610.hand held GPS observations or other comparable positioning techniques
 DL6610.and have an estimated accuracy of +/- 3 meters.
 DL6610
 DL6610.The orthometric height was determined by differential leveling and
 DL6610.adjusted by the NATIONAL GEODETIC SURVEY
 DL6610.in April 2010.
 DL6610
 DL6610.No vertical observational check was made to the station.
 DL6610
 DL6610.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6610.GEOID18 height accuracy estimate available here.
 DL6610
 DL6610.Click photographs - Photos may exist for this station.
 DL6610
 DL6610.The dynamic height is computed by dividing the NAVD 88
 DL6610.geopotential number by the normal gravity value computed on the
 DL6610.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6610.degrees latitude (g = 980.6199 gals.).
 DL6610
 DL6610.The modeled gravity was interpolated from observed gravity values.
 DL6610
 DL6610
 DL6610_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2337605524(NAD 83)
 DL6610
 DL6610                          SUPERSEDED SURVEY CONTROL
 DL6610
 DL6610.No superseded survey control is available for this station.
 DL6610
 DL6610_MARKER: Z = SEE DESCRIPTION
 DL6610_SETTING: 37 = SET IN A MASSIVE RETAINING WALL
 DL6610_SP_SET: RETAINING WALL
 DL6610_MAGNETIC: N = NO MAGNETIC MATERIAL
 DL6610_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 DL6610_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 DL6610+SATELLITE: SATELLITE OBSERVATIONS - March 18, 2025
 DL6610
 DL6610  HISTORY     - Date     Condition        Report By
 DL6610  HISTORY     - 20081010 MONUMENTED       NGS
 DL6610  HISTORY     - 20120401 GOOD             GEOCAC
 DL6610  HISTORY     - 20250318 GOOD             INDIV
 DL6610
 DL6610                          STATION DESCRIPTION
 DL6610
 DL6610'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008
 DL6610'THE MARK IS LOCATED AT THE JEFFERSON MEMORIAL SOUTH WALKWAY LEADING TO
 DL6610'THE MEMORIAL.
 DL6610'
 DL6610'TO REACH FROM EAST BASIN DRIVE AND SOUTHWEST FREEWAY, WALK 0.02 MI
 DL6610'(0.0 KM) EAST TO A PARKING LOT ENTRANCE, PROCEED 0.06 MI (0.1 KM)
 DL6610'NORTH ACROSS THE PARKING LOT TO A SIDEWALK, PROCEED EAST ALONG THE
 DL6610'SIDEWALK FOR 0.03 MI (0.0 KM) TO THE MARK ON THE LEFT.
 DL6610'
 DL6610'THE MARK CONSISTS OF A 1-INCH (3 CM) DIAMETER BY 3.5 INCHES (9 CM)
 DL6610'LONG STAINLESS STEEL PIPE SET IN THE WALL AND A STAINLESS STEEL SCREW
 DL6610'PLUG, SCREWED INTO THE PIPE AND FLUSH WITH THE WALL OF A WALKWAY 37.1
 DL6610'FT (11.3 M) NORTH OF THE SOUTH CURB OF THE SIDEWALK, 5.0 FT (1.5 M)
 DL6610'NORTH OF A LIGHT SET IN THE RETAINING WALL, 26.9 FT (8.2 M) EAST OF A
 DL6610'RAMP LEADING TO THE MEMORIAL.
 DL6610
 DL6610                          STATION RECOVERY (2012)
 DL6610
 DL6610'RECOVERY NOTE BY GEOCACHING 2012 (MFM)
 DL6610'RECOVERED AS DESCRIBED.
 DL6610
 DL6610                          STATION RECOVERY (2025)
 DL6610
 DL6610'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2025 (JH)
 DL6610'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6611 ***********************************************************************
 DL6611  DESIGNATION -  JEFFERSON MEMORIAL NORTH
 DL6611  PID         -  DL6611
 DL6611  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6611  COUNTRY     -  US
 DL6611  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6611
 DL6611                         *CURRENT SURVEY CONTROL
 DL6611  ______________________________________________________________________
 DL6611* NAD 83(1986) POSITION- 38 52 54.41   (N) 077 02 12.89   (W)   HD_HELD1
 DL6611* NAVD 88 ORTHO HEIGHT -     3.701 (meters)       12.14  (feet) ADJUSTED
 DL6611  ______________________________________________________________________
 DL6611  GEOID HEIGHT    -        -32.101 (meters)                     GEOID18
 DL6611  DYNAMIC HEIGHT  -          3.699 (meters)       12.14  (feet) COMP
 DL6611  MODELED GRAVITY -    980,097.1   (mgal)                       NAVD 88
 DL6611
 DL6611  VERT ORDER      -  FIRST     CLASS II
 DL6611
 DL6611.The horizontal coordinates were determined by differentially corrected
 DL6611.hand held GPS observations or other comparable positioning techniques
 DL6611.and have an estimated accuracy of +/- 3 meters.
 DL6611
 DL6611.The orthometric height was determined by differential leveling and
 DL6611.adjusted by the NATIONAL GEODETIC SURVEY
 DL6611.in April 2010.
 DL6611
 DL6611.No vertical observational check was made to the station.
 DL6611
 DL6611.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6611.GEOID18 height accuracy estimate available here.
 DL6611
 DL6611.Click photographs - Photos may exist for this station.
 DL6611
 DL6611.The dynamic height is computed by dividing the NAVD 88
 DL6611.geopotential number by the normal gravity value computed on the
 DL6611.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6611.degrees latitude (g = 980.6199 gals.).
 DL6611
 DL6611.The modeled gravity was interpolated from observed gravity values.
 DL6611
 DL6611
 DL6611_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2331805629(NAD 83)
 DL6611
 DL6611                          SUPERSEDED SURVEY CONTROL
 DL6611
 DL6611.No superseded survey control is available for this station.
 DL6611
 DL6611_MARKER: Z = SEE DESCRIPTION
 DL6611_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 DL6611_SP_SET: BUILDING WALL
 DL6611_MARK LOGO: NONE
 DL6611_MAGNETIC: N = NO MAGNETIC MATERIAL
 DL6611_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 DL6611_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 DL6611+SATELLITE: SATELLITE OBSERVATIONS - April 01, 2012
 DL6611
 DL6611  HISTORY     - Date     Condition        Report By
 DL6611  HISTORY     - 2008     MONUMENTED       NGS
 DL6611  HISTORY     - 20120301 GOOD             NGS
 DL6611  HISTORY     - 20120401 GOOD             GEOCAC
 DL6611
 DL6611                          STATION DESCRIPTION
 DL6611
 DL6611'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008
 DL6611'THE MARK IS LOCATED ON THE NORTH SIDE OF THE BUILDING AT THE JEFFERSON
 DL6611'MEMORIAL.
 DL6611'
 DL6611'TO REACH FROM EAST BASIN DRIVE AND SOUTHWEST FREEWAY, WALK 0.02 MI
 DL6611'(0.0 KM) EAST TO A PARKING LOT ENTRANCE.  PROCEED 0.06 MI (0.1 KM)
 DL6611'NORTH ACROSS THE PARKING LOT TO A SIDEWALK.  CONTINUE NORTH ALONG THE
 DL6611'SIDEWALK FOR 0.07 MI (0.1 KM) PROCEED EAST FOR 0.01 MI (0.0 KM) TO THE
 DL6611'MARK SET IN THE SIDE OF THE BUILDING.
 DL6611'
 DL6611'THE MARK CONSISTS OF A 1-INCH (3 CM) DIAMETER BY 3.5 INCHES (9 CM)
 DL6611'LONG STAINLESS STEEL PIPE SET IN THE WALL AND A STAINLESS STEEL SCREW
 DL6611'PLUG, SCREWED INTO THE PIPE AND FLUSH WITH THE WALL.  IT IS 37.3 FT
 DL6611'(11.4 M) SOUTH OF THE STAIRS LEADING TO THE TIDAL BASIN, 16.5 FT (5.0
 DL6611'M) EAST OF THE WALKWAY CIRCLING THE MEMORIAL AND 0.25 M (0.8 FT) SOUTH
 DL6611'OF THE SECOND STEP LEADING TO THE MEMORIAL.
 DL6611
 DL6611                          STATION RECOVERY (2012)
 DL6611
 DL6611'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DL6611'RECOVERED AS DESCRIBED.
 DL6611
 DL6611                          STATION RECOVERY (2012)
 DL6611
 DL6611'RECOVERY NOTE BY GEOCACHING 2012 (MFM)
 DL6611'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6612 ***********************************************************************
 DL6612  DESIGNATION -  JEFFERSON MEMORIAL EAST
 DL6612  PID         -  DL6612
 DL6612  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6612  COUNTRY     -  US
 DL6612  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6612
 DL6612                         *CURRENT SURVEY CONTROL
 DL6612  ______________________________________________________________________
 DL6612* NAD 83(1986) POSITION- 38 52 54.42   (N) 077 02 10.27   (W)   HD_HELD1
 DL6612* NAVD 88 ORTHO HEIGHT -     3.076 (meters)       10.09  (feet) ADJUSTED
 DL6612  ______________________________________________________________________
 DL6612  GEOID HEIGHT    -        -32.102 (meters)                     GEOID18
 DL6612  DYNAMIC HEIGHT  -          3.074 (meters)       10.09  (feet) COMP
 DL6612  MODELED GRAVITY -    980,097.2   (mgal)                       NAVD 88
 DL6612
 DL6612  VERT ORDER      -  FIRST     CLASS II
 DL6612
 DL6612.The horizontal coordinates were determined by differentially corrected
 DL6612.hand held GPS observations or other comparable positioning techniques
 DL6612.and have an estimated accuracy of +/- 3 meters.
 DL6612
 DL6612.The orthometric height was determined by differential leveling and
 DL6612.adjusted by the NATIONAL GEODETIC SURVEY
 DL6612.in April 2010.
 DL6612
 DL6612.No vertical observational check was made to the station.
 DL6612
 DL6612.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6612.GEOID18 height accuracy estimate available here.
 DL6612
 DL6612.Click photographs - Photos may exist for this station.
 DL6612
 DL6612.The dynamic height is computed by dividing the NAVD 88
 DL6612.geopotential number by the normal gravity value computed on the
 DL6612.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6612.degrees latitude (g = 980.6199 gals.).
 DL6612
 DL6612.The modeled gravity was interpolated from observed gravity values.
 DL6612
 DL6612
 DL6612_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2338205628(NAD 83)
 DL6612
 DL6612                          SUPERSEDED SURVEY CONTROL
 DL6612
 DL6612.No superseded survey control is available for this station.
 DL6612
 DL6612_MARKER: Z = SEE DESCRIPTION
 DL6612_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 DL6612_SP_SET: BUILDING WALL
 DL6612_MAGNETIC: N = NO MAGNETIC MATERIAL
 DL6612_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 DL6612_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 DL6612+SATELLITE: SATELLITE OBSERVATIONS - March 30, 2022
 DL6612
 DL6612  HISTORY     - Date     Condition        Report By
 DL6612  HISTORY     - 2008     MONUMENTED       NGS
 DL6612  HISTORY     - 20120401 GOOD             GEOCAC
 DL6612  HISTORY     - 20220330 GOOD             NGS
 DL6612
 DL6612                          STATION DESCRIPTION
 DL6612
 DL6612'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008
 DL6612'THE MARK IS LOCATED ON THE NORTH EAST OF THE BUILDING AT THE JEFFERSON
 DL6612'MEMORIAL.
 DL6612'
 DL6612'TO REACH FROM EAST BASIN DRIVE AND SOUTHWEST FREEWAY, WALK 0.02 MI
 DL6612'(0.0 KM) EAST TO A PARKING LOT ENTRANCE.  PROCEED 0.06 MI (0.1 KM)
 DL6612'NORTH ACROSS THE PARKING LOT TO A SIDEWALK.  CONTINUE NORTH ALONG THE
 DL6612'SIDEWALK FOR 0.07 MI (0.1 KM) PROCEED EAST FOR 0.04 MI (0.0 KM) TO THE
 DL6612'MARK SET IN SIDE OF THE BUILDING.
 DL6612'
 DL6612'THE MARK CONSISTS OF A 1-INCH (3 CM) DIAMETER BY 3.5 INCHES (9 CM)
 DL6612'LONG STAINLESS STEEL PIPE SET IN THE WALL AND A STAINLESS STEEL SCREW
 DL6612'PLUG, SCREWED INTO THE PIPE AND FLUSH WITH THE WALL, 16.1 FT (4.9 M)
 DL6612'WEST FROM THE EDGE OF A WALKWAY, 0.25 M (0.8 FT) SOUTH OF THE SECOND
 DL6612'STEP LEADING TO THE MEMORIAL, 37.3 FT (11.4 M) SOUTH OF THE TOP STEP
 DL6612'LEADING TO THE TIDAL BASIN.
 DL6612
 DL6612                          STATION RECOVERY (2012)
 DL6612
 DL6612'RECOVERY NOTE BY GEOCACHING 2012 (MFM)
 DL6612'RECOVERED AS DESCRIBED.
 DL6612
 DL6612                          STATION RECOVERY (2022)
 DL6612
 DL6612'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2022 (GAS)
 DL6612'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 UA0024 ***********************************************************************
 UA0024  FBN         -  This is a Federal Base Network Control Station.
 UA0024  DESIGNATION -  JEFFERSON PIER
 UA0024  PID         -  UA0024
 UA0024  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 UA0024  COUNTRY     -  US
 UA0024  USGS QUAD   -  WASHINGTON WEST (2016)
 UA0024
 UA0024                         *CURRENT SURVEY CONTROL
 UA0024  ______________________________________________________________________
 UA0024* NAD 83(2011) POSITION- 38 53 23.29439(N) 077 02 11.56187(W)   ADJUSTED
 UA0024* NAD 83(2011) ELLIP HT-   -25.066 (meters)        (06/27/12)   ADJUSTED
 UA0024* NAD 83(2011) EPOCH   -  2010.00
 UA0024* NAVD 88 ORTHO HEIGHT -     7.022 (meters)       23.04  (feet) ADJUSTED
 UA0024  ______________________________________________________________________
 UA0024  GEOID HEIGHT    -        -32.086 (meters)                     GEOID18
 UA0024  NAD 83(2011) X  -  1,115,141.486 (meters)                     COMP
 UA0024  NAD 83(2011) Y  - -4,844,303.291 (meters)                     COMP
 UA0024  NAD 83(2011) Z  -  3,982,786.792 (meters)                     COMP
 UA0024  LAPLACE CORR    -         -2.48  (seconds)                    DEFLEC18
 UA0024  DYNAMIC HEIGHT  -          7.018 (meters)       23.02  (feet) COMP
 UA0024  MODELED GRAVITY -    980,097.6   (mgal)                       NAVD 88
 UA0024
 UA0024  VERT ORDER      -  FIRST     CLASS II
 UA0024
 UA0024  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 UA0024  Standards:
 UA0024         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 UA0024            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 UA0024  -------------------------------------------------------------------
 UA0024  NETWORK    0.31   0.63           0.14   0.11   0.32     -0.06516443
 UA0024  -------------------------------------------------------------------
 UA0024  Click here for local accuracies and other accuracy information.
 UA0024
 UA0024.The horizontal coordinates were established by GPS observations
 UA0024.and adjusted by the National Geodetic Survey in June 2012.
 UA0024
 UA0024.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 UA0024.been affixed to the stable North American tectonic plate. See 
 UA0024.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 UA0024
 UA0024.The horizontal coordinates are valid at the epoch date displayed above
 UA0024.which is a decimal equivalence of Year/Month/Day.
 UA0024
 UA0024.The orthometric height was determined by differential leveling and
 UA0024.adjusted by the NATIONAL GEODETIC SURVEY
 UA0024.in February 2015.
 UA0024
 UA0024.Significant digits in the geoid height do not necessarily reflect accuracy.
 UA0024.GEOID18 height accuracy estimate available here.
 UA0024
 UA0024.Click photographs - Photos may exist for this station.
 UA0024
 UA0024.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 UA0024
 UA0024.The Laplace correction was computed from DEFLEC18 derived deflections.
 UA0024
 UA0024.The ellipsoidal height was determined by GPS observations
 UA0024.and is referenced to NAD 83.
 UA0024
 UA0024.The dynamic height is computed by dividing the NAVD 88
 UA0024.geopotential number by the normal gravity value computed on the
 UA0024.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 UA0024.degrees latitude (g = 980.6199 gals.).
 UA0024
 UA0024.The modeled gravity was interpolated from observed gravity values.
 UA0024
 UA0024. The following values were computed from the NAD 83(2011) position.
 UA0024
 UA0024;                    North         East     Units Scale Factor Converg.
 UA0024;SPC MD       -   135,774.099   396,829.496   MT  0.99994988   -0 01 22.6
 UA0024;SPC MD       -   445,452.19  1,301,931.44   sFT  0.99994988   -0 01 22.6
 UA0024;SPC VA N     - 2,136,780.280 3,626,959.754   MT  0.99995965   +0 54 48.1
 UA0024;SPC VA N     - 7,010,419.97 11,899,450.46   sFT  0.99995965   +0 54 48.1
 UA0024;UTM  18      - 4,306,519.391   323,370.831   MT  0.99998418   -1 16 44.1
 UA0024
 UA0024!             -  Elev Factor  x  Scale Factor =   Combined Factor
 UA0024!SPC MD       -   1.00000393  x   0.99994988  =   0.99995381
 UA0024!SPC VA N     -   1.00000393  x   0.99995965  =   0.99996358
 UA0024!UTM  18      -   1.00000393  x   0.99998418  =   0.99998811
 UA0024
 UA0024_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2337006519(NAD 83)
 UA0024
 UA0024|---------------------------------------------------------------------|
 UA0024| PID    Reference Object                     Distance      Geod. Az  |
 UA0024|                                                           dddmmss.s |
 UA0024| HV4442 WASHINGTON MONUMENT                 119.221 METERS 10816     |
 UA0024|---------------------------------------------------------------------|
 UA0024
 UA0024                          SUPERSEDED SURVEY CONTROL
 UA0024
 UA0024  NAD 83(2007)-  38 53 23.29463(N)    077 02 11.56258(W) AD(2002.00) 0
 UA0024  ELLIP H (02/10/07)  -25.045  (m)                       GP(2002.00)    
 UA0024  ELLIP H (02/12/02)  -25.021  (m)                       GP(       ) 4 1
 UA0024  NAD 83(1993)-  38 53 23.29439(N)    077 02 11.56216(W) AD(       ) B
 UA0024  ELLIP H (06/29/94)  -25.094  (m)                       GP(       ) 4 1
 UA0024  NAD 83(1993)-  38 53 23.29440(N)    077 02 11.56215(W) AD(       ) B
 UA0024  ELLIP H (04/04/94)  -25.094  (m)                       GP(       ) 4 1
 UA0024  NAD 27      -  38 53 22.89700(N)    077 02 12.64600(W) AD(       ) 3
 UA0024  USSD        -  38 53 23.23000(N)    077 02 12.48000(W) AD(       ) 3
 UA0024  NAVD 88 (04/20/10)    7.020  (m)           23.03   (f) SUPERSEDED  1 2
 UA0024  NAVD 88               7.02   (m)           23.0    (f) LEVELING    3  
 UA0024  NAVD 88 (05/07/99)    7.021  (m)           23.03   (f) SUPERSEDED  1 2
 UA0024  NAVD 88 (04/04/94)    7.0    (m)  GEOID93  model used  GPS OBS        
 UA0024
 UA0024.Superseded values are not recommended for survey control.
 UA0024
 UA0024.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 UA0024.See file dsdata.pdf to determine how the superseded data were derived.
 UA0024
 UA0024_MARKER: X = CHISELED CROSS
 UA0024_SETTING: 9 = POST (STONE OR PRECAST CONCRETE)
 UA0024_PROJECTION: PROJECTING 30 CENTIMETERS
 UA0024_MAGNETIC: N = NO MAGNETIC MATERIAL
 UA0024_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 UA0024_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 UA0024+SATELLITE: SATELLITE OBSERVATIONS - October 05, 2025
 UA0024
 UA0024  HISTORY     - Date     Condition        Report By
 UA0024  HISTORY     - 1889     MONUMENTED       PBPP
 UA0024  HISTORY     - 1907     GOOD             CGS
 UA0024  HISTORY     - 1940     GOOD             CGS
 UA0024  HISTORY     - 19930909 GOOD             NGS
 UA0024  HISTORY     - 19960718 GOOD             DMW
 UA0024  HISTORY     - 19980928 GOOD             NGS
 UA0024  HISTORY     - 19991122 GOOD             NGS
 UA0024  HISTORY     - 20000224 GOOD             NGS
 UA0024  HISTORY     - 20000330 GOOD             NGS
 UA0024  HISTORY     - 20000510 GOOD             NGS
 UA0024  HISTORY     - 20030515 GOOD             DMW
 UA0024  HISTORY     - 20051216 GOOD             GEOCAC
 UA0024  HISTORY     - 20061111 GOOD             USPSQD
 UA0024  HISTORY     - 20081222 GOOD             NGS
 UA0024  HISTORY     - 20090319 GOOD             GEOCAC
 UA0024  HISTORY     - 20100521 GOOD             GEOCAC
 UA0024  HISTORY     - 20120301 GOOD             NGS
 UA0024  HISTORY     - 20140408 GOOD             NGS
 UA0024  HISTORY     - 20180718 GOOD             USPSQD
 UA0024  HISTORY     - 20211211 GOOD             USPSQD
 UA0024  HISTORY     - 20230329 GOOD             DIO
 UA0024  HISTORY     - 20251005 GOOD             NGIA
 UA0024
 UA0024                          STATION DESCRIPTION
 UA0024
 UA0024'DESCRIBED BY PUB BLDGS AND PARKS 1889 (OBF)
 UA0024'JEFFERSON PIER IS A CONCRETE POST ABOUT NW OF THE WASHINGTON MONUMENT,
 UA0024'VERY NEARLY IN THE LATITUDE OF THE CAPITOL DOME AND THE LONGTITUDE OF
 UA0024'THE WHITE HOUSE.
 UA0024
 UA0024                          STATION RECOVERY (1907)
 UA0024
 UA0024'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1907
 UA0024'RECOVERED IN GOOD CONDITION.
 UA0024
 UA0024                          STATION RECOVERY (1940)
 UA0024
 UA0024'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 UA0024'THIS STATION WAS RECOVERED.  THIS STATION IS LOCATED ON THE W
 UA0024'SLOPE OF THE MOUND OF THE WASHINGTON MONUMENT, AND IS IN LINE
 UA0024'WITH 16TH STREET EXTENDED, AND IN APPROXIMATE RANGE WITH THE
 UA0024'N SIDE OF THE LINCOLN MEMORIAL.  IT IS IN A DEPRESSION ABOUT 8
 UA0024'INCHES BELOW THE LINCOLN MEMORIAL.  IT IS IN A DEPRESSION ABOUT
 UA0024'8 INCHES BELOW THE GENERAL GROUND SURFACE AND ABOUT 15 FEET IN
 UA0024'DIAMETER.  THE MARK IS ABOUT 2 FEET SQUARE AT BASE AND ABOUT 6
 UA0024'INCHES SQUARE AT TOP AND EXTENDS ABOUT 2 FEET ABOVE GROUND.
 UA0024'
 UA0024'THIS MARK IS SAID TO HAVE BEEN RAISED FROM TIME TO TIME AS WORK
 UA0024'WAS DONE ON THE MONUMENT GROUNDS, BUT THE POSITION OF THE
 UA0024'STATION IS SUPPOSED TO HAVE BEEN HELD EACH TIME.
 UA0024
 UA0024                          STATION RECOVERY (1993)
 UA0024
 UA0024'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1993
 UA0024'THE STATION IS LOCATED IN WASHINGTON, D.C., ON THE WASHINGTON MONUMENT
 UA0024'GROUNDS AT THE JEFFERSON PIER STONE WHICH LIES ON A LINE EXTENDING
 UA0024'BETWEEN THE WHITE HOUSE AND THE JEFFERSON MEMORIAL.  OWNERSHIP--UNITED
 UA0024'STATES DEPARTMENT OF THE INTERIOR, NATIONAL PARK SERVICE.  CONTACT THE
 UA0024'NATIONAL PARK SERVICE, TELEPHONE NUMBER (202) 485-9880.
 UA0024'
 UA0024'THE STATION IS A BRASS PLUG WITH A PUNCH MARK, SET IN THE CENTER OF A
 UA0024'RECESSED CROSS IN THE TOP OF A 2 BY 2-FOOT GRANITE MONUMENT WHICH IS
 UA0024'INSCRIBED POSITION OF JEFFERSON PIER ERECTED DECEMBER 18, 1804,
 UA0024'RECOVERED AND RE-ERECTED DECEMBER 2, 1889, DISTRICT OF COLUMBIA AND
 UA0024'PROJECTS 26 INCHES ABOVE THE GROUND.  LOCATED 110 M (360.9 FT)
 UA0024'WEST-NORTHWEST OF THE WASHINGTON MONUMENT AND 13.0 M (42.7 FT) SOUTH
 UA0024'OF THE SOUTH EDGE OF A 15-FOOT WIDE CONCRETE WALKWAY.  NOTE-PERMISSION
 UA0024'MUST BE OBTAINED FROM THE NATIONAL PARK SERVICE TO OCCUPY THIS
 UA0024'STATION.
 UA0024
 UA0024                          STATION RECOVERY (1996)
 UA0024
 UA0024'RECOVERY NOTE BY DAFT MCCUNE WALKER INCORPORATED 1996 (JMS)
 UA0024'RECOVERED AS DESCRIBED.
 UA0024
 UA0024                          STATION RECOVERY (1998)
 UA0024
 UA0024'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1998 (RLA)
 UA0024'RECOVERED AS DESCRIBED.
 UA0024
 UA0024                          STATION RECOVERY (1999)
 UA0024
 UA0024'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1999 (RWA)
 UA0024'RECOVERED AS DESCRIBED.
 UA0024
 UA0024                          STATION RECOVERY (2000)
 UA0024
 UA0024'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2000 (MLM)
 UA0024'RECOVERED BY NGS, RECOVERED AS PREVIOUSLY DESCRIBED.
 UA0024
 UA0024                          STATION RECOVERY (2000)
 UA0024
 UA0024'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 UA0024'RECOVERED AS DESCRIBED.
 UA0024
 UA0024                          STATION RECOVERY (2000)
 UA0024
 UA0024'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 UA0024'RECOVERED AS DESCRIBED.
 UA0024
 UA0024                          STATION RECOVERY (2003)
 UA0024
 UA0024'RECOVERY NOTE BY DAFT MCCUNE WALKER INCORPORATED 2003 (JMS)
 UA0024'RECOVERED IN GOOD CONDITION.
 UA0024
 UA0024                          STATION RECOVERY (2005)
 UA0024
 UA0024'RECOVERY NOTE BY GEOCACHING 2005 (WD)
 UA0024'THE PIER NOW LIES INSIDE A NEW PAVED PATH AND RETAINING WALL THAT
 UA0024'CIRCLES THE WASHINGTON MONUMENT, ABOUT 60 FEET SOUTHEAST OF THE
 UA0024'INTERSECTION OF THREE PAVED ACCESS PATHS AND THE CIRCULAR PATH, AND
 UA0024'ABOUT THREE FEET HIGHER THAN THE CIRCULAR PATH.
 UA0024
 UA0024                          STATION RECOVERY (2006)
 UA0024
 UA0024'RECOVERY NOTE BY US POWER SQUADRON 2006 (DEB)
 UA0024'RECOVERED IN GOOD CONDITION.
 UA0024
 UA0024                          STATION RECOVERY (2008)
 UA0024
 UA0024'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 UA0024'RECOVERED AS DESCRIBED.
 UA0024
 UA0024                          STATION RECOVERY (2009)
 UA0024
 UA0024'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 UA0024'RECOVERED IN GOOD CONDITION.
 UA0024
 UA0024                          STATION RECOVERY (2010)
 UA0024
 UA0024'RECOVERY NOTE BY GEOCACHING 2010 (MTT)
 UA0024'RECOVERED IN GOOD CONDITION.
 UA0024
 UA0024                          STATION RECOVERY (2012)
 UA0024
 UA0024'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 UA0024'RECOVERED AS DESCRIBED.
 UA0024
 UA0024                          STATION RECOVERY (2014)
 UA0024
 UA0024'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 UA0024'RECOVERED AS DESCRIBED.
 UA0024
 UA0024                          STATION RECOVERY (2018)
 UA0024
 UA0024'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 UA0024'RECOVERED IN GOOD CONDITION.
 UA0024
 UA0024                          STATION RECOVERY (2021)
 UA0024
 UA0024'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 UA0024'RECOVERED IN GOOD CONDITION.
 UA0024
 UA0024                          STATION RECOVERY (2023)
 UA0024
 UA0024'RECOVERY NOTE BY DIOPTRA LLC 2023 (AT)
 UA0024'RECOVERED IN GOOD CONDITION.
 UA0024
 UA0024                          STATION RECOVERY (2025)
 UA0024
 UA0024'RECOVERY NOTE BY NATIONAL GEOSPATIAL INTELL AGY 2025 (PR)
 UA0024'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1461 ***********************************************************************
 HV1461  DESIGNATION -  K 4 DCDHT
 HV1461  PID         -  HV1461
 HV1461  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1461  COUNTRY     -  US
 HV1461  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1461
 HV1461                         *CURRENT SURVEY CONTROL
 HV1461  ______________________________________________________________________
 HV1461* NAD 83(1986) POSITION- 38 53 44.     (N) 076 57 08.     (W)   SCALED
 HV1461* NAVD 88 ORTHO HEIGHT -    13.573 (meters)       44.53  (feet) ADJUSTED
 HV1461  ______________________________________________________________________
 HV1461  GEOID HEIGHT    -        -32.228 (meters)                     GEOID18
 HV1461  DYNAMIC HEIGHT  -         13.566 (meters)       44.51  (feet) COMP
 HV1461  MODELED GRAVITY -    980,093.0   (mgal)                       NAVD 88
 HV1461
 HV1461  VERT ORDER      -  SECOND    CLASS 0
 HV1461
 HV1461.The horizontal coordinates were scaled from a map and have
 HV1461.an estimated accuracy of +/- 6 seconds.
 HV1461
 HV1461.The orthometric height was determined by differential leveling and
 HV1461.adjusted by the NATIONAL GEODETIC SURVEY
 HV1461.in June 1991.
 HV1461
 HV1461.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1461.GEOID18 height accuracy estimate available here.
 HV1461
 HV1461.Click photographs - Photos may exist for this station.
 HV1461
 HV1461.The dynamic height is computed by dividing the NAVD 88
 HV1461.geopotential number by the normal gravity value computed on the
 HV1461.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1461.degrees latitude (g = 980.6199 gals.).
 HV1461
 HV1461.The modeled gravity was interpolated from observed gravity values.
 HV1461
 HV1461
 HV1461_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ306069(NAD 83)
 HV1461
 HV1461                          SUPERSEDED SURVEY CONTROL
 HV1461
 HV1461  NGVD 29 (11/26/84)   13.808  (m)           45.30   (f) ADJUSTED    2 0
 HV1461
 HV1461.Superseded values are not recommended for survey control.
 HV1461
 HV1461.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1461.See file dsdata.pdf to determine how the superseded data were derived.
 HV1461
 HV1461_MARKER: DD = SURVEY DISK
 HV1461_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1461_SP_SET: ABUTMENT
 HV1461_STAMPING: K 4 1961
 HV1461_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1461
 HV1461  HISTORY     - Date     Condition        Report By
 HV1461  HISTORY     - 1961     MONUMENTED       DCDHT
 HV1461  HISTORY     - 1961     GOOD             CGS
 HV1461
 HV1461                          STATION DESCRIPTION
 HV1461
 HV1461'DESCRIBED BY COAST AND GEODETIC SURVEY 1961
 HV1461'AT WASHINGTON DC.
 HV1461'IN NE WASHINGTON, AT KENILWORTH AVE., BENNING RD.
 HV1461'INTERCHANGE, NE OF BENNING ROAD, AT A BRIDGE OVER THE SW BOUND
 HV1461'TRAFFIC LANE OF KENILWORTH AVE.  (THIS BRIDGE IS PART OF THE RAMP
 HV1461'CARRYING THE NE BOUND TRAFFIC ON KENILWORTH AVE. TO THE NW BOUND
 HV1461'TRAFFIC ON BENNING ROAD) IN THE ABUTMENT AT THE E CORNER OF THE
 HV1461'BRIDGE, 3.7 FT. FROM THE CURB AND 5.5 FT. FROM THE CENTER OF A
 HV1461'MANHOLE COVER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1991 ***********************************************************************
 HV1991  DESIGNATION -  K 5
 HV1991  PID         -  HV1991
 HV1991  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1991  COUNTRY     -  US
 HV1991  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1991
 HV1991                         *CURRENT SURVEY CONTROL
 HV1991  ______________________________________________________________________
 HV1991* NAD 83(1986) POSITION- 38 53 03.     (N) 077 01 42.     (W)   SCALED
 HV1991* NAVD 88 ORTHO HEIGHT -     4.903 (meters)       16.09  (feet) ADJUSTED
 HV1991  ______________________________________________________________________
 HV1991  GEOID HEIGHT    -        -32.109 (meters)                     GEOID18
 HV1991  DYNAMIC HEIGHT  -          4.901 (meters)       16.08  (feet) COMP
 HV1991  MODELED GRAVITY -    980,098.2   (mgal)                       NAVD 88
 HV1991
 HV1991  VERT ORDER      -  FIRST     CLASS I
 HV1991
 HV1991.The horizontal coordinates were scaled from a map and have
 HV1991.an estimated accuracy of +/- 6 seconds.
 HV1991
 HV1991.The orthometric height was determined by differential leveling and
 HV1991.adjusted by the NATIONAL GEODETIC SURVEY
 HV1991.in June 1991.
 HV1991
 HV1991.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1991.GEOID18 height accuracy estimate available here.
 HV1991
 HV1991.Click photographs - Photos may exist for this station.
 HV1991
 HV1991.The dynamic height is computed by dividing the NAVD 88
 HV1991.geopotential number by the normal gravity value computed on the
 HV1991.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1991.degrees latitude (g = 980.6199 gals.).
 HV1991
 HV1991.The modeled gravity was interpolated from observed gravity values.
 HV1991
 HV1991
 HV1991_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ240058(NAD 83)
 HV1991
 HV1991                          SUPERSEDED SURVEY CONTROL
 HV1991
 HV1991  NGVD 29 (11/26/84)    5.140  (m)           16.86   (f) ADJUSTED    1 1
 HV1991
 HV1991.Superseded values are not recommended for survey control.
 HV1991
 HV1991.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1991.See file dsdata.pdf to determine how the superseded data were derived.
 HV1991
 HV1991_MARKER: DB = BENCH MARK DISK
 HV1991_SETTING: 35 = SET IN A MAT FOUNDATION OR CONCRETE SLAB OTHER THAN
 HV1991+WITH SETTING: PAVEMENT
 HV1991_SP_SET: FOUNDATION
 HV1991_STAMPING: K 5 1971
 HV1991_MARK LOGO: CGS
 HV1991_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1991+STABILITY: SURFACE MOTION
 HV1991
 HV1991  HISTORY     - Date     Condition        Report By
 HV1991  HISTORY     - 1971     MONUMENTED       NGS
 HV1991  HISTORY     - 19920512 MARK NOT FOUND   NGS
 HV1991
 HV1991                          STATION DESCRIPTION
 HV1991
 HV1991'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1991'AT WASHINGTON.
 HV1991'AT WASHINGTON, D.C., ABOUT 0.7 MILE NORTHEAST ALONG THE RICHMOND,
 HV1991'FREDERICKSBURG AND POTOMAC RAILROAD FROM THE NORTHEAST END OF
 HV1991'THE RAILROAD BRIDGE OVER THE POTOMAC RIVER AT POTOMAC PARK,
 HV1991'112.0 FEET WEST OF THE CENTER LINE OF THE 12TH STREET OVERPASS
 HV1991'FOR THE TRACKS, SET IN THE TOP OF THE NORTHEAST CORNER OF THE
 HV1991'CONCRETE FOUNDATION FOR OVERHEAD ELECTRIC CABLE TRUSS NUMBER
 HV1991'F137-52, 7 FEET SOUTHEAST OF THE SOUTHEAST RAIL OF THE MOST
 HV1991'SOUTHEASTERLY OF 4 TRACKS, ABOUT LEVEL WITH THE TRACKS, AND ABOUT
 HV1991'1 FOOT ABOVE THE LEVEL OF THE GROUND.
 HV1991
 HV1991                          STATION RECOVERY (1992)
 HV1991
 HV1991'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1991'THERE IS A NEW BUILDING AT THE DESCRIBED LOCATION.  ASSUMED DESTROYED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV3991 ***********************************************************************
 HV3991  DESIGNATION -  KEMBLE PB AND PP
 HV3991  PID         -  HV3991
 HV3991  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV3991  COUNTRY     -  US
 HV3991  USGS QUAD   -  WASHINGTON WEST (2016)
 HV3991
 HV3991                         *CURRENT SURVEY CONTROL
 HV3991  ______________________________________________________________________
 HV3991* NAD 83(1993) POSITION- 38 55 48.28736(N) 077 05 53.19834(W)   ADJUSTED
 HV3991* NAVD 88 ORTHO HEIGHT -   101.    (meters)      331.    (feet) SCALED
 HV3991  ______________________________________________________________________
 HV3991  GEOID HEIGHT    -        -31.936 (meters)                     GEOID18
 HV3991  LAPLACE CORR    -         -1.79  (seconds)                    DEFLEC18
 HV3991  HORZ ORDER      -  SECOND
 HV3991
 HV3991.The horizontal coordinates were established by classical geodetic methods
 HV3991.and adjusted by the National Geodetic Survey in November 1994.
 HV3991
 HV3991.The orthometric height was scaled from a topographic map.
 HV3991
 HV3991.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV3991.GEOID18 height accuracy estimate available here.
 HV3991
 HV3991.Click photographs - Photos may exist for this station.
 HV3991
 HV3991.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV3991
 HV3991. The following values were computed from the NAD 83(1993) position.
 HV3991
 HV3991;                    North         East     Units Scale Factor Converg.
 HV3991;SPC MD       -   140,248.983   391,493.093   MT  0.99995030   -0 03 41.7
 HV3991;SPC MD       -   460,133.54  1,284,423.59   sFT  0.99995030   -0 03 41.7
 HV3991;SPC VA N     - 2,141,167.405 3,621,550.871   MT  0.99996323   +0 52 29.8
 HV3991;SPC VA N     - 7,024,813.39 11,881,704.82   sFT  0.99996323   +0 52 29.8
 HV3991;UTM  18      - 4,311,110.434   318,133.606   MT  1.00000729   -1 19 07.5
 HV3991
 HV3991!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV3991!SPC MD       -   0.99998920  x   0.99995030  =   0.99993950
 HV3991!SPC VA N     -   0.99998920  x   0.99996323  =   0.99995243
 HV3991!UTM  18      -   0.99998920  x   1.00000729  =   0.99999649
 HV3991
 HV3991:                Primary Azimuth Mark                     Grid Az
 HV3991:SPC MD       -  MITCHELL 2                               202 34 06.3
 HV3991:SPC VA N     -  MITCHELL 2                               201 37 54.8
 HV3991:UTM  18      -  MITCHELL 2                               203 49 32.1
 HV3991
 HV3991_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1813311110(NAD 83)
 HV3991
 HV3991|---------------------------------------------------------------------|
 HV3991| PID    Reference Object                     Distance      Geod. Az  |
 HV3991|                                                           dddmmss.s |
 HV3991| HV1555 MITCHELL 2                          APPROX. 2.2 KM 2023024.6 |
 HV3991|---------------------------------------------------------------------|
 HV3991
 HV3991                          SUPERSEDED SURVEY CONTROL
 HV3991
 HV3991  NAD 83(1991)-  38 55 48.28628(N)    077 05 53.19991(W) AD(       ) 2
 HV3991  NAD 83(1986)-  38 55 48.28608(N)    077 05 53.20976(W) AD(       ) 2
 HV3991  NAD 27      -  38 55 47.88700(N)    077 05 54.28100(W) AD(       ) 2
 HV3991
 HV3991.Superseded values are not recommended for survey control.
 HV3991
 HV3991.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV3991.See file dsdata.pdf to determine how the superseded data were derived.
 HV3991
 HV3991_MARKER: DD = SURVEY DISK
 HV3991_SETTING: 21 = SET IN CONCRETE IN A CLAY TILE PIPE
 HV3991_MARK LOGO: PBPP
 HV3991_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV3991
 HV3991  HISTORY     - Date     Condition        Report By
 HV3991  HISTORY     - 1930     MONUMENTED       PBPP
 HV3991  HISTORY     - 1930     GOOD             PBPP
 HV3991  HISTORY     - 1938     GOOD             CGS
 HV3991  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV3991
 HV3991                          STATION DESCRIPTION
 HV3991
 HV3991'DESCRIBED BY PUB BLDGS AND PARKS 1930
 HV3991'STATION IS LOCATED ON DISTRICT OF COLUMBIA SIDE OF POTOMAC
 HV3991'RIVER 0.4 MILE S OF INTERSECTION OF LOUGHBOROUGH ROAD AND
 HV3991'CHAIN BRIDGE ROAD.  THIS STATION IS LOCATED ON PROMINENT KNOLL
 HV3991'SE OF OLD BATTERY KEMBLE AND DUE S OF LONGVIEW.  A SMALL FRAME
 HV3991'CHAPEL IS JUST N (125 FEET) AND OVER SIDE OF HILL FROM THE
 HV3991'STATION.
 HV3991'
 HV3991'THIS STATION IS MARKED WITH STANDARD P.B. AND P.P. DISK SET
 HV3991'IN 24-INCH TERRA COTTA PIPE FILLED WITH CONCRETE.  THE UNDERGROUND
 HV3991'MARKER IS A NAIL SET IN 8 INCHES OF CONCRETE.
 HV3991
 HV3991                          STATION RECOVERY (1930)
 HV3991
 HV3991'RECOVERY NOTE BY PUB BLDGS AND PARKS 1930
 HV3991'STATION IS LOCATED ON DISTRICT OF COLUMBIA SIDE OF POTOMAC
 HV3991'RIVER, 0.4 MILE S OF INTERSECTION OF LOUGHBOROUGH ROAD AND
 HV3991'CHAIN BRIDGE ROAD.  LOCATED IN YARD OF MR. RUSSELLS HOME,
 HV3991'LONGVIEW.  STATION IS BURIED ABOUT 4 INCHES UNDERGROUND
 HV3991'IN GRASS WALK BETWEEN TERRACE AND LOW HEDGE AND 10 FEET W OF
 HV3991'END OF CONCRETE WALK.
 HV3991'
 HV3991'STATION IS MARKED WITH A STANDARD P.B. AND P.P. BRASS DISK
 HV3991'SET IN 24-INCH TERRA COTTA PIPE FILLED WITH CONCRETE.
 HV3991'
 HV3991'OLD UNDERGROUND MARKER REMOVED AND NEW UNDERGROUND MARKER
 HV3991'IS NAIL SET IN CENTER OF SMALL MILK BOTTLE.
 HV3991'
 HV3991'ENTRANCE TO STATION FROM CHAIN BRIDGE ROAD, TURNING INTO
 HV3991'DIRT LANE AT SIGN MARKED LONGVIEW, AROUND TURN IN LANE TO
 HV3991'RUSSELLS DRIVEWAY.
 HV3991
 HV3991                          STATION RECOVERY (1938)
 HV3991
 HV3991'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV3991'STATION MARK RECOVERED.
 HV3991
 HV3991                          STATION RECOVERY (1971)
 HV3991
 HV3991'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV3991'THIS STATION WAS RECOVERED.  THE DESCRIPTION IS VERY INADEQUATE
 HV3991'AS NO MEASUREMENTS WERE GIVEN TO LANDMARKS.  THE HOUSE STILL
 HV3991'REMAINS AT STATION SITE BUT THE YARD HAS BEEN RE-LANDSCAPED.
 HV3991'ONE DAY WAS ALLOTED IN SEARCH FOR STATION.  HOWEVER, IT IS
 HV3991'BELIEVED THAT THIS STATION STILL IS IN POSITION AND COULD
 HV3991'BE RECOVERED FROM AN INVERSE POSITION.
 HV3991'
 HV3991'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DIST.
 HV3991'OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1225 ***********************************************************************
 HV1225  DESIGNATION -  L
 HV1225  PID         -  HV1225
 HV1225  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1225  COUNTRY     -  US
 HV1225  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1225
 HV1225                         *CURRENT SURVEY CONTROL
 HV1225  ______________________________________________________________________
 HV1225* NAD 83(1986) POSITION- 38 53 59.     (N) 076 58 58.     (W)   SCALED
 HV1225* NAVD 88 ORTHO HEIGHT -    14.332 (meters)       47.02  (feet) ADJUSTED
 HV1225  ______________________________________________________________________
 HV1225  GEOID HEIGHT    -        -32.158 (meters)                     GEOID18
 HV1225  DYNAMIC HEIGHT  -         14.325 (meters)       47.00  (feet) COMP
 HV1225  MODELED GRAVITY -    980,101.7   (mgal)                       NAVD 88
 HV1225
 HV1225  VERT ORDER      -  FIRST     CLASS II
 HV1225
 HV1225.The horizontal coordinates were scaled from a map and have
 HV1225.an estimated accuracy of +/- 6 seconds.
 HV1225
 HV1225.The orthometric height was determined by differential leveling and
 HV1225.adjusted by the NATIONAL GEODETIC SURVEY
 HV1225.in June 1991.
 HV1225
 HV1225.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1225.GEOID18 height accuracy estimate available here.
 HV1225
 HV1225.Click photographs - Photos may exist for this station.
 HV1225
 HV1225.The dynamic height is computed by dividing the NAVD 88
 HV1225.geopotential number by the normal gravity value computed on the
 HV1225.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1225.degrees latitude (g = 980.6199 gals.).
 HV1225
 HV1225.The modeled gravity was interpolated from observed gravity values.
 HV1225
 HV1225
 HV1225_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ280075(NAD 83)
 HV1225
 HV1225                          SUPERSEDED SURVEY CONTROL
 HV1225
 HV1225  NGVD 29 (11/26/84)   14.570  (m)           47.80   (f) ADJUSTED    1 2
 HV1225
 HV1225.Superseded values are not recommended for survey control.
 HV1225
 HV1225.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1225.See file dsdata.pdf to determine how the superseded data were derived.
 HV1225
 HV1225_MARKER: DB = BENCH MARK DISK
 HV1225_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1225_SP_SET: STEPS
 HV1225_STAMPING: L 1916
 HV1225_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1225
 HV1225  HISTORY     - Date     Condition        Report By
 HV1225  HISTORY     - 1916     MONUMENTED       CGS
 HV1225  HISTORY     - 1929     GOOD             CGS
 HV1225  HISTORY     - 1960     GOOD             CGS
 HV1225
 HV1225                          STATION DESCRIPTION
 HV1225
 HV1225'DESCRIBED BY COAST AND GEODETIC SURVEY 1929
 HV1225'AT WASHINGTON.
 HV1225'AT WASHINGTON, ON BENNING ROAD, JUST EAST OF FIFTEENTH STREET
 HV1225'NORTHEAST, AT THE CAPITAL TRANSIT CO. CAR BARNS, AT THE MAIN
 HV1225'PEDESTRIAN ENTRANCE, AND IN THE TOP OF THE WEST END OF THE
 HV1225'SECOND STEP FROM THE TOP.  A STANDARD DISK, STAMPED L 1916.
 HV1225
 HV1225                          STATION RECOVERY (1960)
 HV1225
 HV1225'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1225'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4348 ***********************************************************************
 HV4348  DESIGNATION -  L 1913
 HV4348  PID         -  HV4348
 HV4348  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4348  COUNTRY     -  US
 HV4348  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4348
 HV4348                         *CURRENT SURVEY CONTROL
 HV4348  ______________________________________________________________________
 HV4348* NAD 83(1993) POSITION- 38 52 59.67393(N) 077 03 15.98428(W)   ADJUSTED
 HV4348* NAVD 88 ORTHO HEIGHT -    -0.    (meters)       -0.    (feet) SCALED
 HV4348  ______________________________________________________________________
 HV4348  GEOID HEIGHT    -        -32.074 (meters)                     GEOID18
 HV4348  LAPLACE CORR    -         -2.79  (seconds)                    DEFLEC18
 HV4348  HORZ ORDER      -  THIRD
 HV4348
 HV4348.The horizontal coordinates were established by classical geodetic methods
 HV4348.and adjusted by the National Geodetic Survey in November 1994.
 HV4348
 HV4348.The orthometric height was scaled from a topographic map.
 HV4348
 HV4348.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4348.GEOID18 height accuracy estimate available here.
 HV4348
 HV4348.Click photographs - Photos may exist for this station.
 HV4348
 HV4348.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4348
 HV4348. The following values were computed from the NAD 83(1993) position.
 HV4348
 HV4348;                    North         East     Units Scale Factor Converg.
 HV4348;SPC MD       -   135,046.524   395,276.548   MT  0.99994986   -0 02 03.0
 HV4348;SPC MD       -   443,065.14  1,296,836.47   sFT  0.99994986   -0 02 03.0
 HV4348;SPC VA N     - 2,136,027.418 3,625,418.888   MT  0.99995911   +0 54 07.9
 HV4348;SPC VA N     - 7,007,949.95 11,894,395.14   sFT  0.99995911   +0 54 07.9
 HV4348;UTM  18      - 4,305,826.002   321,802.251   MT  0.99999103   -1 17 23.9
 HV4348
 HV4348!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4348!SPC MD       -   1.00000507  x   0.99994986  =   0.99995493
 HV4348!SPC VA N     -   1.00000507  x   0.99995911  =   0.99996418
 HV4348!UTM  18      -   1.00000507  x   0.99999103  =   0.99999610
 HV4348
 HV4348:                Primary Azimuth Mark                     Grid Az
 HV4348:SPC MD       -  SCHOOL                                   302 27 40.0
 HV4348:SPC VA N     -  SCHOOL                                   301 31 29.1
 HV4348:UTM  18      -  SCHOOL                                   303 43 00.9
 HV4348
 HV4348_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2180205826(NAD 83)
 HV4348
 HV4348|---------------------------------------------------------------------|
 HV4348| PID    Reference Object                     Distance      Geod. Az  |
 HV4348|                                                           dddmmss.s |
 HV4348| HV4301 HEURICHS BREWERY FINIAL             APPROX. 1.2 KM 0031443.2 |
 HV4348| HV4418 RM                                  373.275 METERS 14216     |
 HV4348| HV4417 RT                                  463.628 METERS 1700254.0 |
 HV4348| HV2886 RED TANK                            APPROX. 0.7 KM 2165305.5 |
 HV4348| HV3274 SCHOOL                              APPROX. 2.3 KM 3022537.0 |
 HV4348| HV0043 ARLINGTON BREWERY CUPOLA            APPROX. 2.4 KM 3180013.6 |
 HV4348| HV0240 BLACK TANK                          APPROX. 2.0 KM 3205256.6 |
 HV4348| HV4330 K                                   308.570 METERS 32740     |
 HV4348| HV4225 CONCRETE CHIMNEY                    APPROX. 2.5 KM 3384805.7 |
 HV4348|---------------------------------------------------------------------|
 HV4348
 HV4348                          SUPERSEDED SURVEY CONTROL
 HV4348
 HV4348  NAD 83(1991)-  38 52 59.67264(N)    077 03 15.98583(W) AD(       ) 3
 HV4348  NAD 83(1986)-  38 52 59.67244(N)    077 03 15.99640(W) AD(       ) 3
 HV4348  NAD 27      -  38 52 59.27200(N)    077 03 17.07300(W) AD(       ) 3
 HV4348  USSD        -  38 52 59.61100(N)    077 03 16.90500(W) AD(       ) 3
 HV4348
 HV4348.Superseded values are not recommended for survey control.
 HV4348
 HV4348.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4348.See file dsdata.pdf to determine how the superseded data were derived.
 HV4348
 HV4348_MARKER: Z = SEE DESCRIPTION
 HV4348_SETTING: 0 = UNSPECIFIED SETTING
 HV4348_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4348
 HV4348  HISTORY     - Date     Condition        Report By
 HV4348  HISTORY     - 1913     MONUMENTED       CGS
 HV4348  HISTORY     - 1940     MARK NOT FOUND   CGS
 HV4348
 HV4348                          STATION DESCRIPTION
 HV4348
 HV4348'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4348'STATION IS 3/4-INCH HOLE ON TOP OF TRAINING DIKE.
 HV4348
 HV4348                          STATION RECOVERY (1940)
 HV4348
 HV4348'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV4348'STATION IS LOST.  THE MARK PLOTS IN THE OPEN RIVER ABOUT 60
 HV4348'METERS OFFSHORE FROM THE PRESENT SEA WALL DUE TO THE WIDESPREAD
 HV4348'CHANGES WHICH HAVE TAKEN PLACE ALONG THIS SHORE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1230 ***********************************************************************
 HV1230  DESIGNATION -  L 1=TIDAL BM
 HV1230  PID         -  HV1230
 HV1230  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1230  COUNTRY     -  US
 HV1230  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1230
 HV1230                         *CURRENT SURVEY CONTROL
 HV1230  ______________________________________________________________________
 HV1230* NAD 83(1986) POSITION- 38 53 49.     (N) 076 57 36.     (W)   SCALED
 HV1230* NAVD 88 ORTHO HEIGHT -     4.669 (meters)       15.32  (feet) ADJUSTED
 HV1230  ______________________________________________________________________
 HV1230  GEOID HEIGHT    -        -32.211 (meters)                     GEOID18
 HV1230  DYNAMIC HEIGHT  -          4.667 (meters)       15.31  (feet) COMP
 HV1230  MODELED GRAVITY -    980,095.5   (mgal)                       NAVD 88
 HV1230
 HV1230  VERT ORDER      -  FIRST     CLASS II
 HV1230
 HV1230.The horizontal coordinates were scaled from a map and have
 HV1230.an estimated accuracy of +/- 6 seconds.
 HV1230
 HV1230.The orthometric height was determined by differential leveling and
 HV1230.adjusted by the NATIONAL GEODETIC SURVEY
 HV1230.in June 1991.
 HV1230
 HV1230.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1230.GEOID18 height accuracy estimate available here.
 HV1230
 HV1230.Click photographs - Photos may exist for this station.
 HV1230
 HV1230.The dynamic height is computed by dividing the NAVD 88
 HV1230.geopotential number by the normal gravity value computed on the
 HV1230.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1230.degrees latitude (g = 980.6199 gals.).
 HV1230
 HV1230.The modeled gravity was interpolated from observed gravity values.
 HV1230
 HV1230
 HV1230_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ300071(NAD 83)
 HV1230
 HV1230                          SUPERSEDED SURVEY CONTROL
 HV1230
 HV1230  NGVD 29 (11/26/84)    4.904  (m)           16.09   (f) ADJUSTED    1 2
 HV1230
 HV1230.Superseded values are not recommended for survey control.
 HV1230
 HV1230.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1230.See file dsdata.pdf to determine how the superseded data were derived.
 HV1230
 HV1230_MARKER: DJ = TIDAL STATION DISK
 HV1230_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1230_SP_SET: DOORSILL
 HV1230_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1230
 HV1230  HISTORY     - Date     Condition        Report By
 HV1230  HISTORY     - UNK      MONUMENTED       CGS
 HV1230  HISTORY     - 1929     GOOD             CGS
 HV1230  HISTORY     - 1960     GOOD             CGS
 HV1230
 HV1230                          STATION DESCRIPTION
 HV1230
 HV1230'DESCRIBED BY COAST AND GEODETIC SURVEY 1929
 HV1230'AT WASHINGTON.
 HV1230'AT WASHINGTON, ON BENNING ROAD NORTHEAST, EAST OF BENNING BRIDGE,
 HV1230'AT THE SOUTHWEST CORNER OF THE POTOMAC ELECTRIC POWER CO.
 HV1230'GENERATING PLANT, AT THE ENTRANCE TO THE MACHINE SHOP NOW CALLED
 HV1230'THE MAIN BUILDING, AND IN THE WEST END OF THE DOORSILL.  A
 HV1230'STANDARD DISK.  NOTE-- IT WAS REPORTED IN MAY 1954 THAT STONE
 HV1230'PROJECTIONS ABOVE THE DOOR MAKE IT IMPOSSIBLE TO PLUMB THE ROD
 HV1230'ACCURATELY ON THE MARK.
 HV1230
 HV1230                          STATION RECOVERY (1960)
 HV1230
 HV1230'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1230'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2031 ***********************************************************************
 HV2031  DESIGNATION -  L 2
 HV2031  PID         -  HV2031
 HV2031  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2031  COUNTRY     -  US
 HV2031  USGS QUAD   -  ALEXANDRIA (2019)
 HV2031
 HV2031                         *CURRENT SURVEY CONTROL
 HV2031  ______________________________________________________________________
 HV2031* NAD 83(1986) POSITION- 38 51 25.     (N) 077 00 24.     (W)   SCALED
 HV2031* NAVD 88 ORTHO HEIGHT -     2.135 (meters)        7.00  (feet) ADJUSTED
 HV2031  ______________________________________________________________________
 HV2031  GEOID HEIGHT    -        -32.190 (meters)                     GEOID18
 HV2031  DYNAMIC HEIGHT  -          2.134 (meters)        7.00  (feet) COMP
 HV2031  MODELED GRAVITY -    980,093.2   (mgal)                       NAVD 88
 HV2031
 HV2031  VERT ORDER      -  FIRST     CLASS II
 HV2031
 HV2031.The horizontal coordinates were scaled from a map and have
 HV2031.an estimated accuracy of +/- 6 seconds.
 HV2031
 HV2031.The orthometric height was determined by differential leveling and
 HV2031.adjusted by the NATIONAL GEODETIC SURVEY
 HV2031.in June 1991.
 HV2031
 HV2031.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2031.GEOID18 height accuracy estimate available here.
 HV2031
 HV2031.Click photographs - Photos may exist for this station.
 HV2031
 HV2031.The dynamic height is computed by dividing the NAVD 88
 HV2031.geopotential number by the normal gravity value computed on the
 HV2031.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2031.degrees latitude (g = 980.6199 gals.).
 HV2031
 HV2031.The modeled gravity was interpolated from observed gravity values.
 HV2031
 HV2031
 HV2031_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ258028(NAD 83)
 HV2031
 HV2031                          SUPERSEDED SURVEY CONTROL
 HV2031
 HV2031  NGVD 29 (11/26/84)    2.394  (m)            7.85   (f) ADJUSTED    1 2
 HV2031
 HV2031.Superseded values are not recommended for survey control.
 HV2031
 HV2031.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2031.See file dsdata.pdf to determine how the superseded data were derived.
 HV2031
 HV2031_MARKER: DB = BENCH MARK DISK
 HV2031_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2031_SP_SET: RETAINING WALL
 HV2031_STAMPING: L 2 1944
 HV2031_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2031
 HV2031  HISTORY     - Date     Condition        Report By
 HV2031  HISTORY     - 1944     MONUMENTED       CGS
 HV2031  HISTORY     - 1956     GOOD             CGS
 HV2031
 HV2031                          STATION DESCRIPTION
 HV2031
 HV2031'DESCRIBED BY COAST AND GEODETIC SURVEY 1944
 HV2031'IN WASHINGTON.
 HV2031'IN SOUTHEAST WASHINGTON, AT THE NAVAL AIR STATION, AT THE
 HV2031'PHOTOGRAPHIC SCIENCE LABORATORY (BUILDING 168), AT THE FRONT
 HV2031'ENTRANCE, IN THE TOP OF THE CONCRETE RETAINING WALL, AND 3
 HV2031'INCHES WEST OF THE WEST SIDE OF THE BUILDING.  A STANDARD DISK,
 HV2031'STAMPED L 2 1944.
 HV2031
 HV2031                          STATION RECOVERY (1956)
 HV2031
 HV2031'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956
 HV2031'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8017 ***********************************************************************
 HV8017  DESIGNATION -  L 2
 HV8017  PID         -  HV8017
 HV8017  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8017  COUNTRY     -  US
 HV8017  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8017
 HV8017                         *CURRENT SURVEY CONTROL
 HV8017  ______________________________________________________________________
 HV8017* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8017* NAVD 88 ORTHO HEIGHT -    19.581 (meters)       64.24  (feet) ADJUSTED
 HV8017  ______________________________________________________________________
 HV8017  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8017  DYNAMIC HEIGHT  -         19.571 (meters)       64.21  (feet) COMP
 HV8017  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8017
 HV8017  VERT ORDER      -  FIRST     CLASS 0
 HV8017
 HV8017.The horizontal coordinates were scaled from a map and have
 HV8017.an estimated accuracy of +/- 6 seconds.
 HV8017
 HV8017.The orthometric height was determined by differential leveling and
 HV8017.adjusted by the NATIONAL GEODETIC SURVEY
 HV8017.in June 1991.
 HV8017
 HV8017.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8017.GEOID18 height accuracy estimate available here.
 HV8017
 HV8017.Click photographs - Photos may exist for this station.
 HV8017
 HV8017.The dynamic height is computed by dividing the NAVD 88
 HV8017.geopotential number by the normal gravity value computed on the
 HV8017.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8017.degrees latitude (g = 980.6199 gals.).
 HV8017
 HV8017.The modeled gravity was interpolated from observed gravity values.
 HV8017
 HV8017
 HV8017_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8017
 HV8017                          SUPERSEDED SURVEY CONTROL
 HV8017
 HV8017  NGVD 29 (08/12/92)   19.814  (m)           65.01   (f) ADJUSTED    1 0
 HV8017
 HV8017.Superseded values are not recommended for survey control.
 HV8017
 HV8017.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8017.See file dsdata.pdf to determine how the superseded data were derived.
 HV8017
 HV8017_MARKER: Z = SEE DESCRIPTION
 HV8017_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8017_SP_SET: BUILDING
 HV8017_MARK LOGO: NONE
 HV8017_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8017_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8017
 HV8017  HISTORY     - Date     Condition        Report By
 HV8017  HISTORY     - 1949     MONUMENTED       CGS
 HV8017  HISTORY     - 1978     GOOD             NGS
 HV8017  HISTORY     - 1978     GOOD             NGS
 HV8017  HISTORY     - 1982     GOOD             NGS
 HV8017  HISTORY     - 19920615 GOOD             NGS
 HV8017
 HV8017                          STATION DESCRIPTION
 HV8017
 HV8017'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8017'IN WASHINGTON DC.
 HV8017'THE MARK IS 11.6 FT ABOVE GROUND.
 HV8017'AT THE WHITE HOUSE, IN THE W CORNER OF THE SOUTH PORTICO, 1.5 FEET
 HV8017'WEST FROM WEST CORNER OF SOUTH PORTICO, 0.9 FEET
 HV8017'EAST FROM MOST EASTERLY EDGE OF WINDOW LOCATED ON THE SW PORTION OF
 HV8017'THE SOUTH WALL.  WHITE HOUSE WALL MARK.
 HV8017
 HV8017                          STATION RECOVERY (1978)
 HV8017
 HV8017'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8017'THE MARK IS 11.6 FT ABOVE GROUND.
 HV8017'AT THE WHITE HOUSE, IN THE W CORNER OF THE SOUTH PORTICO, 1.5 FEET
 HV8017'WEST FROM WEST CORNER OF SOUTH PORTICO, 0.9 FEET
 HV8017'EAST FROM MOST EASTERLY EDGE OF WINDOW LOCATED ON THE SW PORTION OF
 HV8017'THE SOUTH WALL.  WHITE HOUSE WALL MARK.
 HV8017
 HV8017                          STATION RECOVERY (1982)
 HV8017
 HV8017'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8017'RECOVERED IN GOOD CONDITION.
 HV8017
 HV8017                          STATION RECOVERY (1992)
 HV8017
 HV8017'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8017'IN WASHINGTON, D.C., AT THE WHITE HOUSE, IN THE WEST CORNER OF THE
 HV8017'SOUTH PORTICO, 1.5 FEET (0.5 M) WEST FROM WEST CORNER OF SOUTH
 HV8017'PORTICO, 0.9 FEET (27.4 CM) EAST FROM MOST EASTERLY EDGE OF WINDOW
 HV8017'LOCATED ON THE SW PORTION OF THE SOUTH WALL.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7997 ***********************************************************************
 HV7997  DESIGNATION -  L 3
 HV7997  PID         -  HV7997
 HV7997  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7997  COUNTRY     -  US
 HV7997  USGS QUAD   -  WASHINGTON WEST (2016)
 HV7997
 HV7997                         *CURRENT SURVEY CONTROL
 HV7997  ______________________________________________________________________
 HV7997* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV7997* NAVD 88 ORTHO HEIGHT -    19.607 (meters)       64.33  (feet) ADJUSTED
 HV7997  ______________________________________________________________________
 HV7997  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV7997  DYNAMIC HEIGHT  -         19.596 (meters)       64.29  (feet) COMP
 HV7997  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV7997
 HV7997  VERT ORDER      -  FIRST     CLASS 0
 HV7997
 HV7997.The horizontal coordinates were scaled from a map and have
 HV7997.an estimated accuracy of +/- 6 seconds.
 HV7997
 HV7997.The orthometric height was determined by differential leveling and
 HV7997.adjusted by the NATIONAL GEODETIC SURVEY
 HV7997.in June 1991.
 HV7997
 HV7997.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7997.GEOID18 height accuracy estimate available here.
 HV7997
 HV7997.Click photographs - Photos may exist for this station.
 HV7997
 HV7997.The dynamic height is computed by dividing the NAVD 88
 HV7997.geopotential number by the normal gravity value computed on the
 HV7997.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV7997.degrees latitude (g = 980.6199 gals.).
 HV7997
 HV7997.The modeled gravity was interpolated from observed gravity values.
 HV7997
 HV7997
 HV7997_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV7997
 HV7997                          SUPERSEDED SURVEY CONTROL
 HV7997
 HV7997  NGVD 29 (08/12/92)   19.838  (m)           65.09   (f) ADJUSTED    1 0
 HV7997
 HV7997.Superseded values are not recommended for survey control.
 HV7997
 HV7997.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7997.See file dsdata.pdf to determine how the superseded data were derived.
 HV7997
 HV7997_MARKER: Z = SEE DESCRIPTION
 HV7997_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV7997_SP_SET: BUILDING
 HV7997_MARK LOGO: NONE
 HV7997_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV7997_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV7997_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV7997+SATELLITE: SATELLITE OBSERVATIONS - June 16, 1992
 HV7997
 HV7997  HISTORY     - Date     Condition        Report By
 HV7997  HISTORY     - 1949     MONUMENTED       CGS
 HV7997  HISTORY     - 1978     GOOD             NGS
 HV7997  HISTORY     - 1978     GOOD             NGS
 HV7997  HISTORY     - 1982     GOOD             NGS
 HV7997  HISTORY     - 19920616 GOOD             NGS
 HV7997
 HV7997                          STATION DESCRIPTION
 HV7997
 HV7997'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV7997'IN WASHINGTON DC.
 HV7997'THE MARK IS 12 FT ABOVE GROUND.
 HV7997'AT THE WHITE HOUSE, 1 FOOT SOUTH OF THE CORNER OF THE WHITE HOUSE MAIN
 HV7997'BUILDING, AND THE CHINESE ROOM WHICH IS PART OF THE WEST WING, 14 FEET
 HV7997'EAST OF THE CENTER OF THE SOUTH ENTRANCE TO THE CHINESE ROOM, 13 FEET
 HV7997'NORTH OF THE SOUTHWEST CORNER OF THE WHITE HOUSE.  WHITE HOUSE WALL
 HV7997'MARK.
 HV7997
 HV7997                          STATION RECOVERY (1978)
 HV7997
 HV7997'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV7997'THE MARK IS 12 FT ABOVE GROUND.
 HV7997'AT THE WHITE HOUSE, 1 FOOT SOUTH OF THE CORNER OF THE WHITE HOUSE MAIN
 HV7997'BUILDING, AND THE CHINESE ROOM WHICH IS PART OF THE WEST WING, 14 FEET
 HV7997'EAST OF THE CENTER OF THE SOUTH ENTRANCE TO THE CHINESE ROOM, 13 FEET
 HV7997'NORTH OF THE SOUTHWEST CORNER OF THE WHITE HOUSE.  WHITE HOUSE WALL
 HV7997'MARK.
 HV7997
 HV7997                          STATION RECOVERY (1982)
 HV7997
 HV7997'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV7997'RECOVERED IN GOOD CONDITION.
 HV7997
 HV7997                          STATION RECOVERY (1992)
 HV7997
 HV7997'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV7997'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 1 FOOT (0.3 M) SOUTH OF THE
 HV7997'CORNER OF THE WHITE HOUSE MAIN BUILDING AND THE CHINESE ROOM WHICH IS
 HV7997'PART OF THE WEST WING, 14 FEET (4.3 M) EAST OF THE CENTER OF THE
 HV7997'SOUTH ENTRANCE TO THE CHINESE ROOM, 13 FEET (4.0 M) NORTH OF THE
 HV7997'SOUTHWEST CORNER OF THE WHITE HOUSE.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8000 ***********************************************************************
 HV8000  DESIGNATION -  L 4
 HV8000  PID         -  HV8000
 HV8000  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8000  COUNTRY     -  US
 HV8000  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8000
 HV8000                         *CURRENT SURVEY CONTROL
 HV8000  ______________________________________________________________________
 HV8000* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8000* NAVD 88 ORTHO HEIGHT -    19.599 (meters)       64.30  (feet) ADJUSTED
 HV8000  ______________________________________________________________________
 HV8000  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8000  DYNAMIC HEIGHT  -         19.588 (meters)       64.27  (feet) COMP
 HV8000  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8000
 HV8000  VERT ORDER      -  FIRST     CLASS 0
 HV8000
 HV8000.The horizontal coordinates were scaled from a map and have
 HV8000.an estimated accuracy of +/- 6 seconds.
 HV8000
 HV8000.The orthometric height was determined by differential leveling and
 HV8000.adjusted by the NATIONAL GEODETIC SURVEY
 HV8000.in June 1991.
 HV8000
 HV8000.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8000.GEOID18 height accuracy estimate available here.
 HV8000
 HV8000.Click photographs - Photos may exist for this station.
 HV8000
 HV8000.The dynamic height is computed by dividing the NAVD 88
 HV8000.geopotential number by the normal gravity value computed on the
 HV8000.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8000.degrees latitude (g = 980.6199 gals.).
 HV8000
 HV8000.The modeled gravity was interpolated from observed gravity values.
 HV8000
 HV8000
 HV8000_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8000
 HV8000                          SUPERSEDED SURVEY CONTROL
 HV8000
 HV8000  NGVD 29 (08/12/92)   19.830  (m)           65.06   (f) ADJUSTED    1 0
 HV8000
 HV8000.Superseded values are not recommended for survey control.
 HV8000
 HV8000.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8000.See file dsdata.pdf to determine how the superseded data were derived.
 HV8000
 HV8000_MARKER: Z = SEE DESCRIPTION
 HV8000_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8000_SP_SET: BUILDING
 HV8000_MARK LOGO: NONE
 HV8000_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8000_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8000
 HV8000  HISTORY     - Date     Condition        Report By
 HV8000  HISTORY     - 1949     MONUMENTED       CGS
 HV8000  HISTORY     - 1978     GOOD             NGS
 HV8000  HISTORY     - 1978     GOOD             NGS
 HV8000  HISTORY     - 1982     GOOD             NGS
 HV8000  HISTORY     - 19920615 GOOD             NGS
 HV8000
 HV8000                          STATION DESCRIPTION
 HV8000
 HV8000'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8000'IN WASHINGTON DC.
 HV8000'THE MARK IS 12 FT ABOVE BLACKTOP DELIVERY AREA.
 HV8000'AT THE WHITE HOUSE, 1.5 FEET NORTH OF THE CORNER OF THE WHITE HOUSE
 HV8000'AND THE CHINESE ROOM AND ON THE NORTH SIDE OF THE CHINESE ROOM, 14.8
 HV8000'FEET EAST OF THE NORTH ENTRANCE TO THE CHINESE ROOM, AND 33.6 FEET
 HV8000'SOUTH OF THE NORTHWEST CORNER OF THE WHITE HOUSE.  WHITE HOUSE WALL
 HV8000'MARK.
 HV8000
 HV8000                          STATION RECOVERY (1978)
 HV8000
 HV8000'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8000'THE MARK IS 12 FT ABOVE BLACKTOP DELIVERY AREA.
 HV8000'AT THE WHITE HOUSE, 1.5 FEET NORTH OF THE CORNER OF THE WHITE HOUSE
 HV8000'AND THE CHINESE ROOM AND ON THE NORTH SIDE OF THE CHINESE ROOM, 14.8
 HV8000'FEET EAST OF THE NORTH ENTRANCE TO THE CHINESE ROOM, AND 33.6 FEET
 HV8000'SOUTH OF THE NORTHWEST CORNER OF THE WHITE HOUSE.  WHITE HOUSE WALL
 HV8000'MARK.
 HV8000
 HV8000                          STATION RECOVERY (1982)
 HV8000
 HV8000'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8000'RECOVERED IN GOOD CONDITION.
 HV8000
 HV8000                          STATION RECOVERY (1992)
 HV8000
 HV8000'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8000'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 1.5 FEET (0.5 M) NORTH OF THE
 HV8000'CORNER OF THE WHITE HOUSE AND THE CHINESE ROOM AND ON THE NORTH SIDE
 HV8000'OF THE CHINESE ROOM, 14.8 FEET (4.5 M) EAST OF THE NORTH ENTRANCE TO
 HV8000'THE CHINESE ROOM, AND 33.6 FEET (10.2 M) SOUTH OF THE NORTHWEST
 HV8000'CORNER OF THE WHITE HOUSE.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1459 ***********************************************************************
 HV1459  DESIGNATION -  L 4 DCDHT
 HV1459  PID         -  HV1459
 HV1459  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1459  COUNTRY     -  US
 HV1459  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1459
 HV1459                         *CURRENT SURVEY CONTROL
 HV1459  ______________________________________________________________________
 HV1459* NAD 83(1986) POSITION- 38 53 44.     (N) 076 57 08.     (W)   SCALED
 HV1459* NAVD 88 ORTHO HEIGHT -    13.343 (meters)       43.78  (feet) ADJUSTED
 HV1459  ______________________________________________________________________
 HV1459  GEOID HEIGHT    -        -32.228 (meters)                     GEOID18
 HV1459  DYNAMIC HEIGHT  -         13.336 (meters)       43.75  (feet) COMP
 HV1459  MODELED GRAVITY -    980,093.0   (mgal)                       NAVD 88
 HV1459
 HV1459  VERT ORDER      -  SECOND    CLASS 0
 HV1459
 HV1459.The horizontal coordinates were scaled from a map and have
 HV1459.an estimated accuracy of +/- 6 seconds.
 HV1459
 HV1459.The orthometric height was determined by differential leveling and
 HV1459.adjusted by the NATIONAL GEODETIC SURVEY
 HV1459.in June 1991.
 HV1459
 HV1459.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1459.GEOID18 height accuracy estimate available here.
 HV1459
 HV1459.Click photographs - Photos may exist for this station.
 HV1459
 HV1459.The dynamic height is computed by dividing the NAVD 88
 HV1459.geopotential number by the normal gravity value computed on the
 HV1459.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1459.degrees latitude (g = 980.6199 gals.).
 HV1459
 HV1459.The modeled gravity was interpolated from observed gravity values.
 HV1459
 HV1459
 HV1459_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ306069(NAD 83)
 HV1459
 HV1459                          SUPERSEDED SURVEY CONTROL
 HV1459
 HV1459  NGVD 29 (11/26/84)   13.577  (m)           44.54   (f) ADJUSTED    2 0
 HV1459
 HV1459.Superseded values are not recommended for survey control.
 HV1459
 HV1459.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1459.See file dsdata.pdf to determine how the superseded data were derived.
 HV1459
 HV1459_MARKER: DD = SURVEY DISK
 HV1459_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1459_SP_SET: ABUTMENT
 HV1459_STAMPING: L 4 1961
 HV1459_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1459
 HV1459  HISTORY     - Date     Condition        Report By
 HV1459  HISTORY     - 1961     MONUMENTED       DCDHT
 HV1459  HISTORY     - 1961     GOOD             CGS
 HV1459
 HV1459                          STATION DESCRIPTION
 HV1459
 HV1459'DESCRIBED BY COAST AND GEODETIC SURVEY 1961
 HV1459'AT WASHINGTON DC.
 HV1459'IN NE WASHINGTON, AT THE KENILWORTH AVE., BENNING RD.
 HV1459'INTERCHANGE, NE OF BENNING ROAD AT A BRIDGE OVER THE SW BOUND
 HV1459'TRAFFIC LANE OF KENILWORTH AVE.  (THIS BRIDGE IS PART OF THE RAMP
 HV1459'CARRYING THE NE BOUND TRAFFIC ON KENILWORTH AVE. TO THE NW BOUND
 HV1459'TRAFFIC ON BENNING ROAD), AT THE N CORNER, IN THE TOP OF THE
 HV1459'ABUTMENT, 1.6 FT. FROM THE CURB AND 2.3 FT. W. OF A GUARDRAIL
 HV1459'POST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1859 ***********************************************************************
 HV1859  DESIGNATION -  L 5
 HV1859  PID         -  HV1859
 HV1859  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1859  COUNTRY     -  US
 HV1859  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1859
 HV1859                         *CURRENT SURVEY CONTROL
 HV1859  ______________________________________________________________________
 HV1859* NAD 83(1986) POSITION- 38 54 33.     (N) 077 03 09.     (W)   SCALED
 HV1859* NAVD 88 ORTHO HEIGHT -    11.038 (meters)       36.21  (feet) ADJUSTED
 HV1859  ______________________________________________________________________
 HV1859  GEOID HEIGHT    -        -32.030 (meters)                     GEOID18
 HV1859  DYNAMIC HEIGHT  -         11.032 (meters)       36.19  (feet) COMP
 HV1859  MODELED GRAVITY -    980,093.8   (mgal)                       NAVD 88
 HV1859
 HV1859  VERT ORDER      -  FIRST     CLASS I
 HV1859
 HV1859.The horizontal coordinates were scaled from a map and have
 HV1859.an estimated accuracy of +/- 6 seconds.
 HV1859
 HV1859.The orthometric height was determined by differential leveling and
 HV1859.adjusted by the NATIONAL GEODETIC SURVEY
 HV1859.in June 1991.
 HV1859
 HV1859.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1859.GEOID18 height accuracy estimate available here.
 HV1859
 HV1859.Click photographs - Photos may exist for this station.
 HV1859
 HV1859.The dynamic height is computed by dividing the NAVD 88
 HV1859.geopotential number by the normal gravity value computed on the
 HV1859.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1859.degrees latitude (g = 980.6199 gals.).
 HV1859
 HV1859.The modeled gravity was interpolated from observed gravity values.
 HV1859
 HV1859
 HV1859_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ220086(NAD 83)
 HV1859
 HV1859                          SUPERSEDED SURVEY CONTROL
 HV1859
 HV1859  NGVD 29 (11/26/84)   11.275  (m)           36.99   (f) ADJUSTED    1 1
 HV1859
 HV1859.Superseded values are not recommended for survey control.
 HV1859
 HV1859.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1859.See file dsdata.pdf to determine how the superseded data were derived.
 HV1859
 HV1859_MARKER: DB = BENCH MARK DISK
 HV1859_SETTING: 66 = SET IN ROCK OUTCROP
 HV1859_STAMPING: L 5 1971
 HV1859_MARK LOGO: CGS
 HV1859_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 HV1859+STABILITY: POSITION/ELEVATION WELL
 HV1859_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1859+SATELLITE: SATELLITE OBSERVATIONS - March 31, 1990
 HV1859
 HV1859  HISTORY     - Date     Condition        Report By
 HV1859  HISTORY     - 1971     MONUMENTED       NGS
 HV1859  HISTORY     - 1974     GOOD             NGS
 HV1859  HISTORY     - 1984     GOOD             NGS
 HV1859  HISTORY     - 19900331 GOOD             NGS
 HV1859
 HV1859                          STATION DESCRIPTION
 HV1859
 HV1859'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1859'AT WASHINGTON DC.
 HV1859'AT WASHINGTON, D.C., ABOUT 1.9 MILES NORTH ALONG ROCK CREEK
 HV1859'PARKWAY FROM THE LINCOLN MEMORIAL, 48 FEET NORTH-NORTHWEST OF THE
 HV1859'CENTER LINE OF THE PARKWAY, SET IN THE TOP AND 11.0 FEET
 HV1859'NORTHWEST OF THE SOUTHEAST EDGE OF A 20- X 90-FOOT SLOPING ROCK
 HV1859'BANK, 81.5 FEET WEST OF LIGHT POLE NUMBER 68, 83 FEET
 HV1859'WEST-SOUTHWEST OF A FORKED ELM TREE, 42 1/2 FEET (SLOPE
 HV1859'MEASUREMENT) NORTHEAST OF A METAL MANHOLE COVER ON THE NORTH SIDE
 HV1859'OF A PAVED BICYCLE PATH, AND ABOUT 12 FEET ABOVE THE LEVEL OF
 HV1859'THE PARKWAY.
 HV1859
 HV1859                          STATION RECOVERY (1974)
 HV1859
 HV1859'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974
 HV1859'RECOVERED IN GOOD CONDITION.
 HV1859
 HV1859                          STATION RECOVERY (1984)
 HV1859
 HV1859'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984
 HV1859'RECOVERED IN GOOD CONDITION.  ADD--7.0 METERS (23 FT) NNW OF THE NNW
 HV1859'CURB OF THE PARKWAY, 14.6 METERS (48 FT) NE OF A ROUND MANHOLE COVER
 HV1859'IN THE MIDDLE OF THE BIKE PATH.
 HV1859
 HV1859                          STATION RECOVERY (1990)
 HV1859
 HV1859'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990
 HV1859'3.0 KM (1.86 MI) NORTHERLY ALONG ROCK CREEK PARKWAY FROM THE LINCOLN
 HV1859'MEMORIAL IN WASHINGTON, DC, NEAR THE CENTER OF A 20 BY 90 FOOT
 HV1859'EXPOSED AREA OF BEDROCK IN A HIGHWAY CUT, 42.8 M (140.42 FT) WEST OF
 HV1859'UTILITY LIGHT POLE NUMBER 510, 14.6 M (47.90 FT) NORTHWEST OF THE
 HV1859'CENTER OF THE PARKWAY, 12.9 M (42.32 FT) NORTHEAST OF A 24-INCH
 HV1859'MANHOLE COVER IN A BICYCLE PATH ALONG THE NORTHWEST SIDE OF THE
 HV1859'PARKWAY, AND 3.7 M (12.14 FT) NORTHWEST OF THE SOUTHEAST EDGE OF THE
 HV1859'BEDROCK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8029 ***********************************************************************
 HV8029  DESIGNATION -  L 7
 HV8029  PID         -  HV8029
 HV8029  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8029  COUNTRY     -  US
 HV8029  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8029
 HV8029                         *CURRENT SURVEY CONTROL
 HV8029  ______________________________________________________________________
 HV8029* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8029* NAVD 88 ORTHO HEIGHT -    19.620 (meters)       64.37  (feet) ADJUSTED
 HV8029  ______________________________________________________________________
 HV8029  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8029  DYNAMIC HEIGHT  -         19.610 (meters)       64.34  (feet) COMP
 HV8029  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8029
 HV8029  VERT ORDER      -  FIRST     CLASS 0
 HV8029
 HV8029.The horizontal coordinates were scaled from a map and have
 HV8029.an estimated accuracy of +/- 6 seconds.
 HV8029
 HV8029.The orthometric height was determined by differential leveling and
 HV8029.adjusted by the NATIONAL GEODETIC SURVEY
 HV8029.in June 1991.
 HV8029
 HV8029.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8029.GEOID18 height accuracy estimate available here.
 HV8029
 HV8029.Click photographs - Photos may exist for this station.
 HV8029
 HV8029.The dynamic height is computed by dividing the NAVD 88
 HV8029.geopotential number by the normal gravity value computed on the
 HV8029.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8029.degrees latitude (g = 980.6199 gals.).
 HV8029
 HV8029.The modeled gravity was interpolated from observed gravity values.
 HV8029
 HV8029
 HV8029_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8029
 HV8029                          SUPERSEDED SURVEY CONTROL
 HV8029
 HV8029  NGVD 29 (08/12/92)   19.851  (m)           65.13   (f) ADJUSTED    1 0
 HV8029
 HV8029.Superseded values are not recommended for survey control.
 HV8029
 HV8029.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8029.See file dsdata.pdf to determine how the superseded data were derived.
 HV8029
 HV8029_MARKER: Z = SEE DESCRIPTION
 HV8029_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8029_SP_SET: BUILDING
 HV8029_MARK LOGO: NONE
 HV8029_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8029_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8029
 HV8029  HISTORY     - Date     Condition        Report By
 HV8029  HISTORY     - 1949     MONUMENTED       CGS
 HV8029  HISTORY     - 1978     GOOD             NGS
 HV8029  HISTORY     - 1978     GOOD             NGS
 HV8029  HISTORY     - 1982     GOOD             NGS
 HV8029  HISTORY     - 19920615 GOOD             NGS
 HV8029
 HV8029                          STATION DESCRIPTION
 HV8029
 HV8029'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8029'IN WASHINGTON DC.
 HV8029'THE MARK IS 12 FT ABOVE BLACKTOP AREA.
 HV8029'AT THE WHITE HOUSE, AT THE CORNER OF THE EAST WING AND THE WHITE
 HV8029'HOUSE, 1.5 FEET NORTH OF THE CORNER AND THE NORTH WALL OF THE EAST
 HV8029'WING, 33.4 FEET SOUTH OF THE NORTHEAST CORNER OF THE WHITE HOUSE, AND
 HV8029'15.0 FEET WEST OF THE NORTH ENTRANCE TO THE EAST WING.  WHITE HOUSE
 HV8029'WALL MARK.
 HV8029
 HV8029                          STATION RECOVERY (1978)
 HV8029
 HV8029'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8029'THE MARK IS 12 FT ABOVE BLACKTOP AREA.
 HV8029'AT THE WHITE HOUSE, AT THE CORNER OF THE EAST WING AND THE WHITE
 HV8029'HOUSE, 1.5 FEET NORTH OF THE CORNER AND THE NORTH WALL OF THE EAST
 HV8029'WING, 33.4 FEET SOUTH OF THE NORTHEAST CORNER OF THE WHITE HOUSE, AND
 HV8029'15.0 FEET WEST OF THE NORTH ENTRANCE TO THE EAST WING.  WHITE HOUSE
 HV8029'WALL MARK.
 HV8029
 HV8029                          STATION RECOVERY (1982)
 HV8029
 HV8029'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8029'RECOVERED IN GOOD CONDITION.
 HV8029
 HV8029                          STATION RECOVERY (1992)
 HV8029
 HV8029'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8029'AT THE WHITE HOUSE, AT THE CORNER OF THE EAST WING AND THE WHITE
 HV8029'HOUSE, 33.4 FEET (10.2 M) SOUTH OF THE NORTHEAST CORNER OF THE WHITE
 HV8029'HOUSE, AND 15.0 FEET (4.6 M) WEST OF THE NORTH ENTRANCE TO THE EAST
 HV8029'WING, AND 1.5 FEET (0.5 M) NORTH OF THE CORNER AND THE NORTH WALL OF
 HV8029'THE EAST WING.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1993 ***********************************************************************
 HV1993  DESIGNATION -  L 7 METRO
 HV1993  PID         -  HV1993
 HV1993  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1993  COUNTRY     -  US
 HV1993  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1993
 HV1993                         *CURRENT SURVEY CONTROL
 HV1993  ______________________________________________________________________
 HV1993* NAD 83(1986) POSITION- 38 52 37.     (N) 077 02 11.     (W)   SCALED
 HV1993* NAVD 88 ORTHO HEIGHT -     7.475 (meters)       24.52  (feet) ADJUSTED
 HV1993  ______________________________________________________________________
 HV1993  GEOID HEIGHT    -        -32.111 (meters)                     GEOID18
 HV1993  DYNAMIC HEIGHT  -          7.471 (meters)       24.51  (feet) COMP
 HV1993  MODELED GRAVITY -    980,096.8   (mgal)                       NAVD 88
 HV1993
 HV1993  VERT ORDER      -  FIRST     CLASS I
 HV1993
 HV1993.The horizontal coordinates were scaled from a map and have
 HV1993.an estimated accuracy of +/- 6 seconds.
 HV1993
 HV1993.The orthometric height was determined by differential leveling and
 HV1993.adjusted by the NATIONAL GEODETIC SURVEY
 HV1993.in June 1991.
 HV1993
 HV1993.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1993.GEOID18 height accuracy estimate available here.
 HV1993
 HV1993.Click photographs - Photos may exist for this station.
 HV1993
 HV1993.The dynamic height is computed by dividing the NAVD 88
 HV1993.geopotential number by the normal gravity value computed on the
 HV1993.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1993.degrees latitude (g = 980.6199 gals.).
 HV1993
 HV1993.The modeled gravity was interpolated from observed gravity values.
 HV1993
 HV1993
 HV1993_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ233050(NAD 83)
 HV1993
 HV1993                          SUPERSEDED SURVEY CONTROL
 HV1993
 HV1993  NGVD 29 (11/26/84)    7.711  (m)           25.30   (f) ADJUSTED    1 1
 HV1993
 HV1993.Superseded values are not recommended for survey control.
 HV1993
 HV1993.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1993.See file dsdata.pdf to determine how the superseded data were derived.
 HV1993
 HV1993_MARKER: DD = SURVEY DISK
 HV1993_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1993_SP_SET: BRIDGE
 HV1993_STAMPING: L 7
 HV1993_MARK LOGO: WMATA
 HV1993_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1993
 HV1993  HISTORY     - Date     Condition        Report By
 HV1993  HISTORY     - 1971     MONUMENTED       LOCSUR
 HV1993  HISTORY     - 1971     GOOD             NGS
 HV1993
 HV1993                          STATION DESCRIPTION
 HV1993
 HV1993'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1993'AT WASHINGTON.
 HV1993'AT WASHINGTON, D.C., AT EAST POTOMAC PARK, AT THE NORTHEAST
 HV1993'END OF THE RICHMOND, FREDERICKSBURG AND POTOMAC RAILROAD BRIDGE
 HV1993'OVER THE POTOMAC RIVER, 6 1/2 FEET SOUTHEAST OF THE SOUTHEAST
 HV1993'RAIL OF THE MORE SOUTHEASTERLY OF TWO TRACKS, 2.1 FEET NORTH OF
 HV1993'THE NORTHEAST END OF THE SOUTHEAST METAL GIRDER ON THE BRIDGE,
 HV1993'AND ABOUT 1/2 FOOT BELOW THE LEVEL OF THE TRACK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8028 ***********************************************************************
 HV8028  DESIGNATION -  L 8
 HV8028  PID         -  HV8028
 HV8028  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8028  COUNTRY     -  US
 HV8028  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8028
 HV8028                         *CURRENT SURVEY CONTROL
 HV8028  ______________________________________________________________________
 HV8028* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8028* NAVD 88 ORTHO HEIGHT -    19.600 (meters)       64.30  (feet) ADJUSTED
 HV8028  ______________________________________________________________________
 HV8028  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8028  DYNAMIC HEIGHT  -         19.590 (meters)       64.27  (feet) COMP
 HV8028  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8028
 HV8028  VERT ORDER      -  FIRST     CLASS 0
 HV8028
 HV8028.The horizontal coordinates were scaled from a map and have
 HV8028.an estimated accuracy of +/- 6 seconds.
 HV8028
 HV8028.The orthometric height was determined by differential leveling and
 HV8028.adjusted by the NATIONAL GEODETIC SURVEY
 HV8028.in June 1991.
 HV8028
 HV8028.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8028.GEOID18 height accuracy estimate available here.
 HV8028
 HV8028.Click photographs - Photos may exist for this station.
 HV8028
 HV8028.The dynamic height is computed by dividing the NAVD 88
 HV8028.geopotential number by the normal gravity value computed on the
 HV8028.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8028.degrees latitude (g = 980.6199 gals.).
 HV8028
 HV8028.The modeled gravity was interpolated from observed gravity values.
 HV8028
 HV8028
 HV8028_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8028
 HV8028                          SUPERSEDED SURVEY CONTROL
 HV8028
 HV8028  NGVD 29 (08/12/92)   19.832  (m)           65.07   (f) ADJUSTED    1 0
 HV8028
 HV8028.Superseded values are not recommended for survey control.
 HV8028
 HV8028.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8028.See file dsdata.pdf to determine how the superseded data were derived.
 HV8028
 HV8028_MARKER: Z = SEE DESCRIPTION
 HV8028_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8028_SP_SET: BUILDING
 HV8028_MARK LOGO: NONE
 HV8028_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8028_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8028
 HV8028  HISTORY     - Date     Condition        Report By
 HV8028  HISTORY     - 1949     MONUMENTED       CGS
 HV8028  HISTORY     - 1978     GOOD             NGS
 HV8028  HISTORY     - 1978     GOOD             NGS
 HV8028  HISTORY     - 1982     GOOD             NGS
 HV8028  HISTORY     - 19920615 GOOD             NGS
 HV8028
 HV8028                          STATION DESCRIPTION
 HV8028
 HV8028'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8028'IN WASHINGTON DC.
 HV8028'AT THE WHITE HOUSE, 15 FEET N OF SE CORNER IN THE NW SECTION OF THE
 HV8028'EAST GARDEN, 1.8 FEET SOUTH FROM SE CORNER IN THE EAST GARDEN, 11.6
 HV8028'FEET ABOVE THE GROUND IN THE EAST WALL.  WHITE HOUSE WALL MARK.
 HV8028
 HV8028                          STATION RECOVERY (1978)
 HV8028
 HV8028'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8028'AT THE WHITE HOUSE, 15 FEET N OF SE CORNER IN THE NW SECTION OF THE
 HV8028'EAST GARDEN, 1.8 FEET SOUTH FROM SE CORNER IN THE EAST GARDEN, 11.6
 HV8028'FEET ABOVE THE GROUND IN THE SOUTH WALL.  WHITE HOUSE WALL MARK.
 HV8028
 HV8028                          STATION RECOVERY (1982)
 HV8028
 HV8028'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8028'RECOVERED IN GOOD CONDITION.
 HV8028
 HV8028                          STATION RECOVERY (1992)
 HV8028
 HV8028'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8028'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 15 FEET (4.6 M) NORTH OF
 HV8028'SOUTHEAST CORNER IN THE NORTHWEST SECTION OF THE EAST GARDEN, 1.8
 HV8028'FEET (0.5 M) SOUTH FROM SOUTHEAST CORNER IN THE EAST GARDEN, 11.6
 HV8028'FEET (3.5 M) ABOVE THE GROUND IN THE EAST WALL.  WHITE HOUSE WALL
 HV8028'MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1992 ***********************************************************************
 HV1992  DESIGNATION -  L 8 METRO
 HV1992  PID         -  HV1992
 HV1992  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1992  COUNTRY     -  US
 HV1992  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1992
 HV1992                         *CURRENT SURVEY CONTROL
 HV1992  ______________________________________________________________________
 HV1992* NAD 83(1986) POSITION- 38 52 44.     (N) 077 02 06.     (W)   SCALED
 HV1992* NAVD 88 ORTHO HEIGHT -     7.439 (meters)       24.41  (feet) ADJUSTED
 HV1992  ______________________________________________________________________
 HV1992  GEOID HEIGHT    -        -32.109 (meters)                     GEOID18
 HV1992  DYNAMIC HEIGHT  -          7.435 (meters)       24.39  (feet) COMP
 HV1992  MODELED GRAVITY -    980,097.1   (mgal)                       NAVD 88
 HV1992
 HV1992  VERT ORDER      -  FIRST     CLASS I
 HV1992
 HV1992.The horizontal coordinates were scaled from a map and have
 HV1992.an estimated accuracy of +/- 6 seconds.
 HV1992
 HV1992.The orthometric height was determined by differential leveling and
 HV1992.adjusted by the NATIONAL GEODETIC SURVEY
 HV1992.in June 1991.
 HV1992
 HV1992.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1992.GEOID18 height accuracy estimate available here.
 HV1992
 HV1992.Click photographs - Photos may exist for this station.
 HV1992
 HV1992.The dynamic height is computed by dividing the NAVD 88
 HV1992.geopotential number by the normal gravity value computed on the
 HV1992.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1992.degrees latitude (g = 980.6199 gals.).
 HV1992
 HV1992.The modeled gravity was interpolated from observed gravity values.
 HV1992
 HV1992
 HV1992_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234053(NAD 83)
 HV1992
 HV1992                          SUPERSEDED SURVEY CONTROL
 HV1992
 HV1992  NGVD 29 (11/26/84)    7.676  (m)           25.18   (f) ADJUSTED    1 1
 HV1992
 HV1992.Superseded values are not recommended for survey control.
 HV1992
 HV1992.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1992.See file dsdata.pdf to determine how the superseded data were derived.
 HV1992
 HV1992_MARKER: DD = SURVEY DISK
 HV1992_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1992_SP_SET: BRIDGE
 HV1992_STAMPING: L 8
 HV1992_MARK LOGO: WMATA
 HV1992_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1992
 HV1992  HISTORY     - Date     Condition        Report By
 HV1992  HISTORY     - 1971     MONUMENTED       LOCSUR
 HV1992  HISTORY     - 1971     GOOD             NGS
 HV1992
 HV1992                          STATION DESCRIPTION
 HV1992
 HV1992'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1992'AT WASHINGTON.
 HV1992'AT WASHINGTON, D.C., ABOUT 0.15 MILE NORTHEAST ALONG THE
 HV1992'RICHMOND, FREDERICKSBURG AND POTOMAC RAILROAD FROM THE NORTHEAST
 HV1992'END OF THE RAILROAD BRIDGE OVER THE POTOMAC RIVER AT POTOMAC
 HV1992'PARK, 7 FEET SOUTHEAST OF THE SOUTHEAST RAIL OF THE MORE
 HV1992'SOUTHEASTERLY OF TWO TRACKS, SET IN THE TOP AND 2.1 FEET
 HV1992'NORTHEAST OF THE SOUTHWEST END OF A 90-FOOT LONG CONCRETE
 HV1992'RETAINING WALL, 95 FEET SOUTHWEST OF THE SOUTHWEST END OF A
 HV1992'METAL GIRDER ON THE RAILROAD OVERPASS FOR INTERSTATE HIGHWAY 95,
 HV1992'AND ABOUT LEVEL WITH THE TRACK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7733 ***********************************************************************
 HV7733  DESIGNATION -  L USE 1931
 HV7733  PID         -  HV7733
 HV7733  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7733  COUNTRY     -  US
 HV7733  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7733
 HV7733                         *CURRENT SURVEY CONTROL
 HV7733  ______________________________________________________________________
 HV7733* NAD 83(1993) POSITION- 38 52 53.51053(N) 076 58 01.18438(W)   ADJUSTED
 HV7733* NAVD 88 ORTHO HEIGHT -     3.52  (+/-2cm)       11.5   (feet) VERTCON3
 HV7733  ______________________________________________________________________
 HV7733  GEOID HEIGHT    -        -32.220 (meters)                     GEOID18
 HV7733  LAPLACE CORR    -         -3.44  (seconds)                    DEFLEC18
 HV7733  HORZ ORDER      -  THIRD
 HV7733  VERT ORDER      -  THIRD ? (See Below)
 HV7733
 HV7733.The horizontal coordinates were established by classical geodetic methods
 HV7733.and adjusted by the National Geodetic Survey in November 1994.
 HV7733
 HV7733.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV7733.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV7733
 HV7733.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7733.GEOID18 height accuracy estimate available here.
 HV7733
 HV7733.The vertical order pertains to the NGVD 29 superseded value.
 HV7733
 HV7733.Click photographs - Photos may exist for this station.
 HV7733
 HV7733.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7733
 HV7733. The following values were computed from the NAD 83(1993) position.
 HV7733
 HV7733;                    North         East     Units Scale Factor Converg.
 HV7733;SPC MD       -   134,855.582   402,863.665   MT  0.99994985   +0 01 14.6
 HV7733;SPC MD       -   442,438.69  1,321,728.54   sFT  0.99994985   +0 01 14.6
 HV7733;SPC VA N     - 2,135,960.469 3,633,008.182   MT  0.99995897   +0 57 24.4
 HV7733;SPC VA N     - 7,007,730.31 11,919,294.34   sFT  0.99995897   +0 57 24.4
 HV7733;UTM  18      - 4,305,468.821   329,383.548   MT  0.99995846   -1 14 06.0
 HV7733
 HV7733!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7733!SPC MD       -   1.00000450  x   0.99994985  =   0.99995435
 HV7733!SPC VA N     -   1.00000450  x   0.99995897  =   0.99996347
 HV7733!UTM  18      -   1.00000450  x   0.99995846  =   0.99996296
 HV7733
 HV7733:                Primary Azimuth Mark                     Grid Az
 HV7733:SPC MD       -  TEE                                      194 43 18.0
 HV7733:SPC VA N     -  TEE                                      193 47 08.2
 HV7733:UTM  18      -  TEE                                      195 58 38.6
 HV7733
 HV7733_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2938305468(NAD 83)
 HV7733
 HV7733|---------------------------------------------------------------------|
 HV7733| PID    Reference Object                     Distance      Geod. Az  |
 HV7733|                                                           dddmmss.s |
 HV7733| HV7731 TEE                                 APPROX. 0.6 KM 1944432.6 |
 HV7733| HV7715 LOCK                                393.883 METERS 31928     |
 HV7733|---------------------------------------------------------------------|
 HV7733
 HV7733                          SUPERSEDED SURVEY CONTROL
 HV7733
 HV7733  NAD 83(1991)-  38 52 53.50918(N)    076 58 01.18550(W) AD(       ) 3
 HV7733  NAD 83(1986)-  38 52 53.50842(N)    076 58 01.19671(W) AD(       ) 3
 HV7733  NAD 27      -  38 52 53.10400(N)    076 58 02.29100(W) AD(       ) 3
 HV7733  NGVD 29               3.76   (m)           12.3    (f) LEVELING    3  
 HV7733
 HV7733.Superseded values are not recommended for survey control.
 HV7733
 HV7733.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7733.See file dsdata.pdf to determine how the superseded data were derived.
 HV7733
 HV7733
 HV7733  HISTORY     - Date     Condition        Report By
 HV7733  HISTORY     - 1931     MONUMENTED       CGS
 HV7733  HISTORY     - 1958     MARK NOT FOUND   CGS
 HV7733
 HV7733                          STATION DESCRIPTION
 HV7733
 HV7733'DESCRIBED BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7733'DUE TO THE LACK OF DESCRIPTION, THE STATION IS NOT RECOVERABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4499 ***********************************************************************
 HV4499  DESIGNATION -  LA D
 HV4499  PID         -  HV4499
 HV4499  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4499  COUNTRY     -  US
 HV4499  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4499
 HV4499                         *CURRENT SURVEY CONTROL
 HV4499  ______________________________________________________________________
 HV4499* NAD 83(1993) POSITION- 38 53 40.91925(N) 077 00 33.63026(W)   ADJUSTED
 HV4499* NAVD 88 ORTHO HEIGHT -    12.6   (meters)       41.    (feet) VERTCON3
 HV4499  ______________________________________________________________________
 HV4499  GEOID HEIGHT    -        -32.117 (meters)                     GEOID18
 HV4499  LAPLACE CORR    -         -3.37  (seconds)                    DEFLEC18
 HV4499  HORZ ORDER      -  SECOND
 HV4499
 HV4499.The horizontal coordinates were established by classical geodetic methods
 HV4499.and adjusted by the National Geodetic Survey in November 1994.
 HV4499
 HV4499.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4499.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4499
 HV4499.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4499.GEOID18 height accuracy estimate available here.
 HV4499
 HV4499.Click photographs - Photos may exist for this station.
 HV4499
 HV4499.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4499
 HV4499. The following values were computed from the NAD 83(1993) position.
 HV4499
 HV4499;                    North         East     Units Scale Factor Converg.
 HV4499;SPC MD       -   136,316.978   399,189.601   MT  0.99994990   -0 00 21.1
 HV4499;SPC MD       -   447,233.29  1,309,674.55   sFT  0.99994990   -0 00 21.1
 HV4499;SPC VA N     - 2,137,361.656 3,629,310.697   MT  0.99996006   +0 55 49.2
 HV4499;SPC VA N     - 7,012,327.37 11,907,163.51   sFT  0.99996006   +0 55 49.2
 HV4499;UTM  18      - 4,307,010.419   325,742.339   MT  0.99997393   -1 15 43.1
 HV4499
 HV4499!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4499!SPC MD       -   1.00000307  x   0.99994990  =   0.99995297
 HV4499!SPC VA N     -   1.00000307  x   0.99996006  =   0.99996313
 HV4499!UTM  18      -   1.00000307  x   0.99997393  =   0.99997700
 HV4499
 HV4499:                Primary Azimuth Mark                     Grid Az
 HV4499:SPC MD       -  LA D AZ MK                               173 54 58.9
 HV4499:SPC VA N     -  LA D AZ MK                               172 58 48.6
 HV4499:UTM  18      -  LA D AZ MK                               175 10 20.9
 HV4499
 HV4499_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2574207010(NAD 83)
 HV4499
 HV4499|---------------------------------------------------------------------|
 HV4499| PID    Reference Object                     Distance      Geod. Az  |
 HV4499|                                                           dddmmss.s |
 HV4499| HV2188 NE 134 A                            307.009 METERS 04819     |
 HV4499| DC6808 LA D AZ MK                                         1735437.8 |
 HV4499| HV4500 1 LA                                360.744 METERS 22715     |
 HV4499|---------------------------------------------------------------------|
 HV4499
 HV4499                          SUPERSEDED SURVEY CONTROL
 HV4499
 HV4499  NAD 83(1991)-  38 53 40.91808(N)    077 00 33.63146(W) AD(       ) 2
 HV4499  NAD 83(1986)-  38 53 40.91749(N)    077 00 33.64218(W) AD(       ) 2
 HV4499  NAD 27      -  38 53 40.51682(N)    077 00 34.72404(W) AD(       ) 2
 HV4499  NGVD 29 (07/19/86)   12.8    (m)           42.     (f) VERT ANG       
 HV4499
 HV4499.Superseded values are not recommended for survey control.
 HV4499
 HV4499.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4499.See file dsdata.pdf to determine how the superseded data were derived.
 HV4499
 HV4499_MARK LOGO: CANDA
 HV4499
 HV4499  HISTORY     - Date     Condition        Report By
 HV4499  HISTORY     - 1981     MONUMENTED       CANDA
 HV4499  HISTORY     - 20180716 MARK NOT FOUND   USPSQD
 HV4499
 HV4499                          STATION DESCRIPTION
 HV4499
 HV4499'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4499'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE LETTER
 HV4499'C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4499'
 HV4499'STATION IS LOCATED IN THE CONCRETE SIDEWALK ON THE SOUTHEAST CORNER
 HV4499'OF LOUISIANA AVE N.W. AND D STREET N.W.
 HV4499'
 HV4499'STATION IS 65.00 FT. NORTH OF LAMP BASE ON LA. AVE.
 HV4499'
 HV4499'STATION IS 10.48 FT. SOUTHWEST OF SIGNAL POST BASE ON D STREET.
 HV4499'
 HV4499'STATION IS 23.87 FT. EAST OF SIGNAL POST BASE ON LA. AVE.
 HV4499
 HV4499                          STATION RECOVERY (2018)
 HV4499
 HV4499'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV4499'SEARCHED ALL CORNERS OF THE INTERSECTION AND COULD NOT FIND ANY SIGN
 HV4499'ON THE MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4176 ***********************************************************************
 HV4176  DESIGNATION -  LAMP
 HV4176  PID         -  HV4176
 HV4176  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4176  COUNTRY     -  US
 HV4176  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4176
 HV4176                         *CURRENT SURVEY CONTROL
 HV4176  ______________________________________________________________________
 HV4176* NAD 83(1993) POSITION- 38 54 04.13077(N) 077 04 13.96177(W)   ADJUSTED
 HV4176  ______________________________________________________________________
 HV4176  GEOID HEIGHT    -        -32.021 (meters)                     GEOID18
 HV4176  LAPLACE CORR    -         -2.88  (seconds)                    DEFLEC18
 HV4176  HORZ ORDER      -  THIRD
 HV4176
 HV4176.The horizontal coordinates were established by classical geodetic methods
 HV4176.and adjusted by the National Geodetic Survey in November 1994.
 HV4176
 HV4176.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4176.GEOID18 height accuracy estimate available here.
 HV4176
 HV4176.Click photographs - Photos may exist for this station.
 HV4176
 HV4176.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4176
 HV4176. The following values were computed from the NAD 83(1993) position.
 HV4176
 HV4176;                    North         East     Units Scale Factor Converg.
 HV4176;SPC MD       -   137,035.040   393,880.759   MT  0.99994995   -0 02 39.4
 HV4176;SPC MD       -   449,589.13  1,292,257.12   sFT  0.99994995   -0 02 39.4
 HV4176;SPC VA N     - 2,137,992.878 3,623,990.774   MT  0.99996061   +0 53 31.7
 HV4176;SPC VA N     - 7,014,398.30 11,889,709.73   sFT  0.99996061   +0 53 31.7
 HV4176;UTM  18      - 4,307,844.726   320,450.327   MT  0.99999698   -1 18 02.2
 HV4176
 HV4176_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2045007844(NAD 83)
 HV4176
 HV4176                          SUPERSEDED SURVEY CONTROL
 HV4176
 HV4176  NAD 83(1991)-  38 54 04.12954(N)    077 04 13.96334(W) AD(       ) 3
 HV4176  NAD 83(1986)-  38 54 04.12930(N)    077 04 13.97362(W) AD(       ) 3
 HV4176  NAD 27      -  38 54 03.72900(N)    077 04 15.04800(W) AD(       ) 3
 HV4176  USSD        -  38 54 04.06600(N)    077 04 14.88100(W) AD(       ) 3
 HV4176
 HV4176.Superseded values are not recommended for survey control.
 HV4176
 HV4176.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4176.See file dsdata.pdf to determine how the superseded data were derived.
 HV4176
 HV4176
 HV4176  HISTORY     - Date     Condition        Report By
 HV4176  HISTORY     - 1913     MONUMENTED       CGS
 HV4176  HISTORY     - 1940     MARK NOT FOUND   CGS
 HV4176
 HV4176                          STATION DESCRIPTION
 HV4176
 HV4176'DESCRIBED BY COAST AND GEODETIC SURVEY 1913
 HV4176'NO TEXT
 HV4176
 HV4176                          STATION RECOVERY (1940)
 HV4176
 HV4176'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940
 HV4176'THE STATION IS LOST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI7410 ***********************************************************************
 AI7410  DESIGNATION -  LAPINE
 AI7410  PID         -  AI7410
 AI7410  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI7410  COUNTRY     -  US
 AI7410  USGS QUAD   -  WASHINGTON WEST (2016)
 AI7410
 AI7410                         *CURRENT SURVEY CONTROL
 AI7410  ______________________________________________________________________
 AI7410* NAD 83(2011) POSITION- 38 55 12.98290(N) 077 03 54.70749(W)   ADJUSTED
 AI7410* NAD 83(2011) ELLIP HT-    44.152 (meters)        (06/27/12)   ADJUSTED
 AI7410* NAD 83(2011) EPOCH   -  2010.00
 AI7410* NAVD 88 ORTHO HEIGHT -    76.16  (meters)      249.9   (feet) LEVELING
 AI7410  ______________________________________________________________________
 AI7410  GEOID HEIGHT    -        -31.994 (meters)                     GEOID18
 AI7410  NAD 83(2011) X  -  1,112,255.433 (meters)                     COMP
 AI7410  NAD 83(2011) Y  - -4,842,842.422 (meters)                     COMP
 AI7410  NAD 83(2011) Z  -  3,985,462.472 (meters)                     COMP
 AI7410  LAPLACE CORR    -         -2.95  (seconds)                    DEFLEC18
 AI7410  VERT ORDER      -  THIRD ?
 AI7410
 AI7410  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AI7410  Standards:
 AI7410         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AI7410            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AI7410  -------------------------------------------------------------------
 AI7410  NETWORK    0.21   0.71           0.09   0.08   0.36      0.01318030
 AI7410  -------------------------------------------------------------------
 AI7410  Click here for local accuracies and other accuracy information.
 AI7410
 AI7410.The horizontal coordinates were established by GPS observations
 AI7410.and adjusted by the National Geodetic Survey in June 2012.
 AI7410
 AI7410.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AI7410.been affixed to the stable North American tectonic plate. See 
 AI7410.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AI7410
 AI7410.The horizontal coordinates are valid at the epoch date displayed above
 AI7410.which is a decimal equivalence of Year/Month/Day.
 AI7410
 AI7410.The orthometric height was determined by differential leveling.
 AI7410.The vertical network tie was performed by a horz. field party for horz.
 AI7410.obs reductions. Reset procedures were used to establish the elevation.
 AI7410
 AI7410.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI7410.GEOID18 height accuracy estimate available here.
 AI7410
 AI7410.Click photographs - Photos may exist for this station.
 AI7410
 AI7410.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AI7410
 AI7410.The Laplace correction was computed from DEFLEC18 derived deflections.
 AI7410
 AI7410.The ellipsoidal height was determined by GPS observations
 AI7410.and is referenced to NAD 83.
 AI7410
 AI7410. The following values were computed from the NAD 83(2011) position.
 AI7410
 AI7410;                    North         East     Units Scale Factor Converg.
 AI7410;UTM  18      - 4,309,956.858   320,962.241   MT  0.99999472   -1 17 52.0
 AI7410
 AI7410!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AI7410!UTM  18      -   0.99999307  x   0.99999472  =   0.99998779
 AI7410
 AI7410_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2096209956(NAD 83)
 AI7410
 AI7410                          SUPERSEDED SURVEY CONTROL
 AI7410
 AI7410  NAD 83(2007)-  38 55 12.98312(N)    077 03 54.70819(W) AD(2002.00) 0
 AI7410  ELLIP H (02/10/07)   44.167  (m)                       GP(2002.00)    
 AI7410  ELLIP H (08/09/02)   44.173  (m)                       GP(       ) 3 2
 AI7410  NAD 83(1991)-  38 55 12.98321(N)    077 03 54.70842(W) AD(       ) B
 AI7410  ELLIP H (08/03/00)   44.165  (m)                       GP(       ) 2 1
 AI7410
 AI7410.Superseded values are not recommended for survey control.
 AI7410
 AI7410.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AI7410.See file dsdata.pdf to determine how the superseded data were derived.
 AI7410
 AI7410_MARKER: F = FLANGE-ENCASED ROD
 AI7410_SETTING: 59 = STAINLESS STEEL ROD IN SLEEVE (10 FT.+)
 AI7410_STAMPING: LAPINE 1997
 AI7410_MARK LOGO: NGS
 AI7410_PROJECTION: RECESSED 1 CENTIMETERS
 AI7410_MAGNETIC: N = NO MAGNETIC MATERIAL
 AI7410_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 AI7410_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AI7410+SATELLITE: SATELLITE OBSERVATIONS - 1997
 AI7410_ROD/PIPE-DEPTH: 7.3 meters
 AI7410_SLEEVE-DEPTH  : 0.9 meters
 AI7410
 AI7410  HISTORY     - Date     Condition        Report By
 AI7410  HISTORY     - 1997     MONUMENTED       NGS
 AI7410
 AI7410                          STATION DESCRIPTION
 AI7410
 AI7410'DESCRIBED BY NATIONAL GEODETIC SURVEY 1997 (RWZ)
 AI7410'LOCATED AT THE US NAVAL OBSERVATORY IN WASHINGTON, DC.  CONTACT THE
 AI7410'LOCATED AT THE US NAVAL OBSERVATORY IN WASHINGTON, DC.  CONTACT THE
 AI7410'HEAD OF EARTH ORIENTATION DEPT.  (JIM RAY) AT 202-762-1444 BEFORE
 AI7410'ENTERING THE OBSERVATORY GROUNDS.  TO REACH GO 2.75 MILES (4.43 KM)
 AI7410'SOUTHEAST ALONG MASSACHUSETTS AVENUE FROM THE INTERSECTION WITH
 AI7410'WESTERN AVENUE AT WESTMORELAND CIRCLE AT THE MARYLAND AND DISTRICT OF
 AI7410'COLUMBIA STATE LINE, TO THE INTERSECTION OF OBSERVATORY CIRCLE NW,
 AI7410'THENCE 0.2 MILE (0.3 KM) NORTHWEST ALONG OBSERVATORY CIRCLE NW TO THE
 AI7410'GUARD HOUSE, THENCE 0.05 MILE (0.08 KM) NORTH ALONG A PAVED ROAD TO
 AI7410'THE TOP OF INCLINE TO THE SECOND SIDEWALK LEADING TO THE ENTRANCE OF
 AI7410'BUILDING NUMBER 52, CONTINUE 0.1 MILE (0.2 KM) IN NORTHERLY DIRECTION
 AI7410'FOLLOWING THE ROAD PASSING BUILDING 59 ON LEFT TO A T INTERSECTION,
 AI7410'THENCE RIGHT AT INTERSECTION AND GO 0.05 MLE TO FLAG POLE CIRCLE, GO
 AI7410'RIGHT AND PARK AT SIDEWALK LEADING TO HELIPORT.  WALK SOUTH TO END OF
 AI7410'SIDEWALK AND STATION, 77.0 FEET (23.5 M) SOSUTHEAST OF SOUTHEAST
 AI7410'CORNER OF SIDEWALK, 18.1 FEET (5.5 M) EAST-NORTHEAST OF BM US NO A IN
 AI7410'A CONCRETE SURROUNDING FOR THE LANDING LIGHT.  NOTE--ACCESS TO THE
 AI7410'DATUM POINT (A CENTERING CAP DRIVEN ON TOP OF THE ROD) IS THROUGH A
 AI7410'5-INCH LOGO CAP. THE SLEEVE DEPTH OF 0.9 METER DOES NOT MEET THE
 AI7410'SPECIFICATIONS FOR A CLASS A MARK. THE ROD WAS DRIVEN TO REFUSAL.
 AI7410'NOTE--CONTACT HEAD OF EARTH ORIENTATION DEPT. (JIM RAY) AT
 AI7410'202-762-1444 BEFORE ENTERING OBSERVATORY GROUNDS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1239 ***********************************************************************
 HV1239  DESIGNATION -  LEE DCDHT
 HV1239  PID         -  HV1239
 HV1239  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1239  COUNTRY     -  US
 HV1239  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1239
 HV1239                         *CURRENT SURVEY CONTROL
 HV1239  ______________________________________________________________________
 HV1239* NAD 83(1986) POSITION- 38 53 47.     (N) 076 55 35.     (W)   SCALED
 HV1239* NAVD 88 ORTHO HEIGHT -    18.231 (meters)       59.81  (feet) ADJUSTED
 HV1239  ______________________________________________________________________
 HV1239  GEOID HEIGHT    -        -32.284 (meters)                     GEOID18
 HV1239  DYNAMIC HEIGHT  -         18.221 (meters)       59.78  (feet) COMP
 HV1239  MODELED GRAVITY -    980,086.6   (mgal)                       NAVD 88
 HV1239
 HV1239  VERT ORDER      -  FIRST     CLASS II
 HV1239
 HV1239.The horizontal coordinates were scaled from a map and have
 HV1239.an estimated accuracy of +/- 6 seconds.
 HV1239
 HV1239.The orthometric height was determined by differential leveling and
 HV1239.adjusted by the NATIONAL GEODETIC SURVEY
 HV1239.in June 1991.
 HV1239
 HV1239.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1239.GEOID18 height accuracy estimate available here.
 HV1239
 HV1239.Click photographs - Photos may exist for this station.
 HV1239
 HV1239.The dynamic height is computed by dividing the NAVD 88
 HV1239.geopotential number by the normal gravity value computed on the
 HV1239.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1239.degrees latitude (g = 980.6199 gals.).
 HV1239
 HV1239.The modeled gravity was interpolated from observed gravity values.
 HV1239
 HV1239
 HV1239_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ329070(NAD 83)
 HV1239
 HV1239                          SUPERSEDED SURVEY CONTROL
 HV1239
 HV1239  NGVD 29 (11/26/84)   18.470  (m)           60.60   (f) ADJUSTED    1 2
 HV1239
 HV1239.Superseded values are not recommended for survey control.
 HV1239
 HV1239.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1239.See file dsdata.pdf to determine how the superseded data were derived.
 HV1239
 HV1239_MARKER: Z = SEE DESCRIPTION
 HV1239_SETTING: 45 = UNSPECIFIED DEEP UNSLEEVED SETTING (10 FT.+)
 HV1239_SP_SET: UNSPECIFIED DEEP SET
 HV1239_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1239+STABILITY: SURFACE MOTION
 HV1239
 HV1239  HISTORY     - Date     Condition        Report By
 HV1239  HISTORY     - UNK      MONUMENTED       DCDHT
 HV1239  HISTORY     - 1929     GOOD             CGS
 HV1239  HISTORY     - 1954     GOOD             CGS
 HV1239
 HV1239                          STATION DESCRIPTION
 HV1239
 HV1239'DESCRIBED BY COAST AND GEODETIC SURVEY 1929
 HV1239'IN WASHINGTON.
 HV1239'IN NORTHEAST WASHINGTON, NEAR THE INTERSECTION OF DIVISION
 HV1239'AVENUE AND FITCH PLACE NORTHEAST, NEAR A BRIDGE OVER A STREAM,
 HV1239'AT THE SOUTHWEST CORNER OF THE BRIDGE, AND 9.5 FEET WEST OF
 HV1239'THE WEST CORNER OF THE CURVED PORTION OF THE WALL.  A DISTRICT
 HV1239'OF COLUMBIA HIGHWAY DEPARTMENT SPECIAL DEEP MARK UNDER A
 HV1239'10-INCH CIRCULAR COVER MARKED WATER METER.  NOTE-- ACCESS TO
 HV1239'THIS MARK IS OBTAINED BY PREARRANGEMENTS WITH ENGINEERS OF THE
 HV1239'DISTRICE OF COLUMBIA HIGHWAY DEPARTMENT.
 HV1239
 HV1239                          STATION RECOVERY (1954)
 HV1239
 HV1239'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1954
 HV1239'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4165 ***********************************************************************
 HV4165  DESIGNATION -  LIBRARY CONGRESS DOME FINIAL
 HV4165  PID         -  HV4165
 HV4165  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4165  COUNTRY     -  US
 HV4165  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4165
 HV4165                         *CURRENT SURVEY CONTROL
 HV4165  ______________________________________________________________________
 HV4165* NAD 83(1993) POSITION- 38 53 19.24774(N) 077 00 16.79591(W)   ADJUSTED
 HV4165  ______________________________________________________________________
 HV4165  GEOID HEIGHT    -        -32.137 (meters)                     GEOID18
 HV4165  LAPLACE CORR    -         -3.35  (seconds)                    DEFLEC18
 HV4165  HORZ ORDER      -  THIRD
 HV4165
 HV4165.The horizontal coordinates were established by classical geodetic methods
 HV4165.and adjusted by the National Geodetic Survey in November 1994.
 HV4165
 HV4165.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4165.GEOID18 height accuracy estimate available here.
 HV4165
 HV4165.Click photographs - Photos may exist for this station.
 HV4165
 HV4165.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4165
 HV4165. The following values were computed from the NAD 83(1993) position.
 HV4165
 HV4165;                    North         East     Units Scale Factor Converg.
 HV4165;SPC MD       -   135,648.694   399,595.230   MT  0.99994987   -0 00 10.5
 HV4165;SPC MD       -   445,040.76  1,311,005.35   sFT  0.99994987   -0 00 10.5
 HV4165;SPC VA N     - 2,136,700.083 3,629,727.194   MT  0.99995956   +0 55 59.8
 HV4165;SPC VA N     - 7,010,156.86 11,908,529.97   sFT  0.99995956   +0 55 59.8
 HV4165;UTM  18      - 4,306,333.389   326,133.230   MT  0.99997225   -1 15 31.9
 HV4165
 HV4165_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2613306333(NAD 83)
 HV4165
 HV4165                          SUPERSEDED SURVEY CONTROL
 HV4165
 HV4165  NAD 83(1991)-  38 53 19.24651(N)    077 00 16.79697(W) AD(       ) 3
 HV4165  NAD 83(1986)-  38 53 19.24597(N)    077 00 16.80776(W) AD(       ) 3
 HV4165  NAD 27      -  38 53 18.84500(N)    077 00 17.88700(W) AD(       ) 3
 HV4165
 HV4165.Superseded values are not recommended for survey control.
 HV4165
 HV4165.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4165.See file dsdata.pdf to determine how the superseded data were derived.
 HV4165
 HV4165_MARKER: 82 = FINIAL
 HV4165_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4165+SATELLITE: SATELLITE OBSERVATIONS - March 19, 2009
 HV4165
 HV4165  HISTORY     - Date     Condition        Report By
 HV4165  HISTORY     - 1913     FIRST OBSERVED   CGS
 HV4165  HISTORY     - 1934     GOOD             CGS
 HV4165  HISTORY     - 1958     GOOD             CGS
 HV4165  HISTORY     - 1961     GOOD             CGS
 HV4165  HISTORY     - 1979     GOOD             NGS
 HV4165  HISTORY     - 19950619 GOOD             USPSQD
 HV4165  HISTORY     - 20020814 GOOD             GEOCAC
 HV4165  HISTORY     - 20090319 GOOD             GEOCAC
 HV4165
 HV4165                          STATION DESCRIPTION
 HV4165
 HV4165'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4165'THIS STATION IS THE TIP OF TOWER ON CONGRESSIONAL LIBRARY.
 HV4165
 HV4165                          STATION RECOVERY (1934)
 HV4165
 HV4165'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1934 (JB)
 HV4165'THIS STATION REDETERMINED.
 HV4165
 HV4165                          STATION RECOVERY (1958)
 HV4165
 HV4165'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV4165'THIS UNDESCRIBED STATION WAS RECOVERED IN GOOD CONDITION.
 HV4165'THE POINT DETERMINED IN 1934 BY J.B., JR. IS AS LISTED ON THE
 HV4165'GPS BASE OF FINIAL ON DOME.
 HV4165
 HV4165                          STATION RECOVERY (1961)
 HV4165
 HV4165'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1961 (JPP)
 HV4165'THIS STATION RECOVERED, AS DESCRIBED.
 HV4165
 HV4165                          STATION RECOVERY (1979)
 HV4165
 HV4165'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 (BMP)
 HV4165'THE STATION IS THE SHORT FINIAL ON THE SQUAT DOME OF THE LIBRARY
 HV4165'OF CONGRESS, WHICH IS IMMEDIATELY EAST OF THE UNITED STATES
 HV4165'CAPITOL BUILDING ON CAPITOL HILL IN WASHINGTON D.C. THE POINT
 HV4165'INTERSECTED WAS THE BASE OF THE FINIAL.
 HV4165
 HV4165                          STATION RECOVERY (1995)
 HV4165
 HV4165'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4165'RECOVERED IN GOOD CONDITION.
 HV4165
 HV4165                          STATION RECOVERY (2002)
 HV4165
 HV4165'RECOVERY NOTE BY GEOCACHING 2002 (APC)
 HV4165'RECOVERED IN GOOD CONDITION.
 HV4165
 HV4165                          STATION RECOVERY (2009)
 HV4165
 HV4165'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV4165'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4047 ***********************************************************************
 HV4047  DESIGNATION -  LINCOLN 1924
 HV4047  PID         -  HV4047
 HV4047  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4047  COUNTRY     -  US
 HV4047  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4047
 HV4047                         *CURRENT SURVEY CONTROL
 HV4047  ______________________________________________________________________
 HV4047* NAD 83(1993) POSITION- 38 53 20.62352(N) 077 03 01.11041(W)   ADJUSTED
 HV4047* NAVD 88 ORTHO HEIGHT -     8.    (meters)       26.    (feet) SCALED
 HV4047  ______________________________________________________________________
 HV4047  GEOID HEIGHT    -        -32.070 (meters)                     GEOID18
 HV4047  LAPLACE CORR    -         -2.50  (seconds)                    DEFLEC18
 HV4047  HORZ ORDER      -  SECOND
 HV4047
 HV4047.The horizontal coordinates were established by classical geodetic methods
 HV4047.and adjusted by the National Geodetic Survey in November 1994.
 HV4047
 HV4047.The orthometric height was scaled from a topographic map.
 HV4047
 HV4047.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4047.GEOID18 height accuracy estimate available here.
 HV4047
 HV4047.Click photographs - Photos may exist for this station.
 HV4047
 HV4047.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4047
 HV4047. The following values were computed from the NAD 83(1993) position.
 HV4047
 HV4047;                    North         East     Units Scale Factor Converg.
 HV4047;SPC MD       -   135,692.309   395,635.382   MT  0.99994987   -0 01 53.7
 HV4047;SPC MD       -   445,183.85  1,298,013.75   sFT  0.99994987   -0 01 53.7
 HV4047;SPC VA N     - 2,136,678.987 3,625,767.124   MT  0.99995959   +0 54 17.2
 HV4047;SPC VA N     - 7,010,087.64 11,895,537.64   sFT  0.99995959   +0 54 17.2
 HV4047;UTM  18      - 4,306,463.793   322,175.167   MT  0.99998939   -1 17 15.2
 HV4047
 HV4047!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4047!SPC MD       -   1.00000381  x   0.99994987  =   0.99995368
 HV4047!SPC VA N     -   1.00000381  x   0.99995959  =   0.99996340
 HV4047!UTM  18      -   1.00000381  x   0.99998939  =   0.99999320
 HV4047
 HV4047:                Primary Azimuth Mark                     Grid Az
 HV4047:SPC MD       -  BOUNDARY WITNESS MK 7 DC VA              211 07 59.1
 HV4047:SPC VA N     -  BOUNDARY WITNESS MK 7 DC VA              210 11 48.2
 HV4047:UTM  18      -  BOUNDARY WITNESS MK 7 DC VA              212 23 20.6
 HV4047
 HV4047_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2217506463(NAD 83)
 HV4047
 HV4047|---------------------------------------------------------------------|
 HV4047| PID    Reference Object                     Distance      Geod. Az  |
 HV4047|                                                           dddmmss.s |
 HV4047| HV1694 BOUNDARY WITNESS MK 7 DC VA         APPROX. 1.1 KM 2110605.4 |
 HV4047| HV3621 ARLINGTON CEMETERY LEE MANSION      APPROX. 2.1 KM 2451841.9 |
 HV4047| HV3961 GEORGETOWN UNIV LOWER SPIRE         APPROX. 2.8 KM 3152318.0 |
 HV4047| HV4301 HEURICHS BREWERY FINIAL             APPROX. 0.7 KM 3340910.4 |
 HV4047|---------------------------------------------------------------------|
 HV4047
 HV4047                          SUPERSEDED SURVEY CONTROL
 HV4047
 HV4047  NAD 83(1991)-  38 53 20.62226(N)    077 03 01.11192(W) AD(       ) 2
 HV4047  NAD 83(1986)-  38 53 20.62198(N)    077 03 01.12246(W) AD(       ) 2
 HV4047  NAD 27      -  38 53 20.22100(N)    077 03 02.19900(W) AD(       ) 2
 HV4047
 HV4047.Superseded values are not recommended for survey control.
 HV4047
 HV4047.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4047.See file dsdata.pdf to determine how the superseded data were derived.
 HV4047
 HV4047_MARKER: Z = SEE DESCRIPTION
 HV4047_SETTING: 0 = UNSPECIFIED SETTING
 HV4047_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4047
 HV4047  HISTORY     - Date     Condition        Report By
 HV4047  HISTORY     - 1924     MONUMENTED       CGS
 HV4047  HISTORY     - 1935     GOOD             CGS
 HV4047  HISTORY     - 1946     GOOD             CGS
 HV4047  HISTORY     - 1959     MARK NOT FOUND   CGS
 HV4047  HISTORY     - 20100314 GOOD             GEOCAC
 HV4047
 HV4047                          STATION DESCRIPTION
 HV4047
 HV4047'DESCRIBED BY COAST AND GEODETIC SURVEY 1924 (EWE)
 HV4047'STATION IS ON TOP OF THE WALLS OF THE LINCOLN MEMORIAL ON THE
 HV4047'SOUTHWESTERN CORNER AT THE INTERSECTION OF THE INNER FACES OF THE
 HV4047'SOUTHERN AND WESTERN WALLS.
 HV4047
 HV4047                          STATION RECOVERY (1935)
 HV4047
 HV4047'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4047'STATION WAS OCCUPIED ECCENTRICALLY.
 HV4047
 HV4047                          STATION RECOVERY (1946)
 HV4047
 HV4047'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (RCB)
 HV4047'THE STATION WAS RECOVERED AS DESCRIBED.  A COMPLETE NEW
 HV4047'DESCRIPTION FOLLOWS--THE STATION IS LOCATED AT THE INNER FACES OF
 HV4047'THE S AND W WALLS OF THE LINCOLN MEMORIAL.  THE MARK IS THE
 HV4047'INTERSECTION OF THE INNER FACES OF THE WALLS.
 HV4047
 HV4047                          STATION RECOVERY (1959)
 HV4047
 HV4047'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (BFL)
 HV4047'STATION SEARCHED FOR BUT NOT FOUND.  PROBABLY LOST.  ROOF HAS
 HV4047'BEEN RECOVERED SINCE ESTABLISHMENT OF STATION.  STATION COULD
 HV4047'NOT BE RE-ESTABLISHED SINCE DESCRIPTION COULD FIT ANY OF FOUR
 HV4047'DIFFERENT POINTS ON ROOF.
 HV4047
 HV4047                          STATION RECOVERY (2010)
 HV4047
 HV4047'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 HV4047'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4048 ***********************************************************************
 HV4048  DESIGNATION -  LINCOLN ECC 1935
 HV4048  PID         -  HV4048
 HV4048  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4048  COUNTRY     -  US
 HV4048  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4048
 HV4048                         *CURRENT SURVEY CONTROL
 HV4048  ______________________________________________________________________
 HV4048* NAD 83(1993) POSITION- 38 53 20.64543(N) 077 03 01.08446(W)   ADJUSTED
 HV4048* NAVD 88 ORTHO HEIGHT -     8.    (meters)       26.    (feet) SCALED
 HV4048  ______________________________________________________________________
 HV4048  GEOID HEIGHT    -        -32.070 (meters)                     GEOID18
 HV4048  LAPLACE CORR    -         -2.50  (seconds)                    DEFLEC18
 HV4048  HORZ ORDER      -  SECOND
 HV4048
 HV4048.The horizontal coordinates were established by classical geodetic methods
 HV4048.and adjusted by the National Geodetic Survey in November 1994.
 HV4048
 HV4048.The orthometric height was scaled from a topographic map.
 HV4048
 HV4048.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4048.GEOID18 height accuracy estimate available here.
 HV4048
 HV4048.Click photographs - Photos may exist for this station.
 HV4048
 HV4048.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4048
 HV4048. The following values were computed from the NAD 83(1993) position.
 HV4048
 HV4048;                    North         East     Units Scale Factor Converg.
 HV4048;SPC MD       -   135,692.985   395,636.008   MT  0.99994987   -0 01 53.7
 HV4048;SPC MD       -   445,186.07  1,298,015.80   sFT  0.99994987   -0 01 53.7
 HV4048;SPC VA N     - 2,136,679.673 3,625,767.739   MT  0.99995959   +0 54 17.2
 HV4048;SPC VA N     - 7,010,089.89 11,895,539.66   sFT  0.99995959   +0 54 17.2
 HV4048;UTM  18      - 4,306,464.454   322,175.808   MT  0.99998939   -1 17 15.2
 HV4048
 HV4048!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4048!SPC MD       -   1.00000381  x   0.99994987  =   0.99995368
 HV4048!SPC VA N     -   1.00000381  x   0.99995959  =   0.99996340
 HV4048!UTM  18      -   1.00000381  x   0.99998939  =   0.99999320
 HV4048
 HV4048:                Primary Azimuth Mark                     Grid Az
 HV4048:SPC MD       -  POTOMAC PARK NW BASE                     130 47 32.4
 HV4048:SPC VA N     -  POTOMAC PARK NW BASE                     129 51 21.5
 HV4048:UTM  18      -  POTOMAC PARK NW BASE                     132 02 53.9
 HV4048
 HV4048_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2217506464(NAD 83)
 HV4048
 HV4048|---------------------------------------------------------------------|
 HV4048| PID    Reference Object                     Distance      Geod. Az  |
 HV4048|                                                           dddmmss.s |
 HV4048| HV1998 POTOMAC PARK NW BASE                APPROX. 1.9 KM 1304538.7 |
 HV4048| HV4047 LINCOLN 1924                          0.921 METERS 22247     |
 HV4048|---------------------------------------------------------------------|
 HV4048
 HV4048                          SUPERSEDED SURVEY CONTROL
 HV4048
 HV4048  NAD 83(1991)-  38 53 20.64415(N)    077 03 01.08598(W) AD(       ) 2
 HV4048  NAD 83(1986)-  38 53 20.64386(N)    077 03 01.09651(W) AD(       ) 2
 HV4048  NAD 27      -  38 53 20.24300(N)    077 03 02.17300(W) AD(       ) 2
 HV4048
 HV4048.Superseded values are not recommended for survey control.
 HV4048
 HV4048.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4048.See file dsdata.pdf to determine how the superseded data were derived.
 HV4048
 HV4048_MARKER: Z = SEE DESCRIPTION
 HV4048_SETTING: 0 = UNSPECIFIED SETTING
 HV4048_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4048
 HV4048  HISTORY     - Date     Condition        Report By
 HV4048  HISTORY     - 1935     MONUMENTED       CGS
 HV4048  HISTORY     - 20100314 GOOD             GEOCAC
 HV4048
 HV4048                          STATION DESCRIPTION
 HV4048
 HV4048'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4048'THIS IS A DESCRIPTION OF AN ECCENTRIC OCCUPATION OF THE OLD
 HV4048'C. AND G.S. STATION LINCOLN.  INSTRUMENT AND LIGHTS WERE SET
 HV4048'AT A POINT 0.715 METER N AND NE CORNER OF THE S BLOCK OF
 HV4048'GRANITE FORMING THE SW CORNER OF THE TOP OF THE LINCOLN
 HV4048'MEMORIAL, 0.669 METER E OF THE NE CORNER OF THE W BLOCK OF
 HV4048'GRANITE FORMING THE CORNER, AND 0.979 METER NE OF A CROSS
 HV4048'SCRATCHED IN THE TOP OF THE GRANITE COPING.  (THIS CROSS MARKS
 HV4048'A STATION OF UNKNOWN ORIGIN AND IS REFERRED TO BELOW.)
 HV4048'THE ECCENTRIC OCCUPATION WAS 0.942 METER NE OF THE INSIDE
 HV4048'CORNER OF THE SW CORNER OF THE COPING.  IT IS NOT MARKED.
 HV4048'NO REFERENCE MARKS.
 HV4048
 HV4048                          STATION RECOVERY (2010)
 HV4048
 HV4048'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 HV4048'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6622 ***********************************************************************
 DL6622  DESIGNATION -  LINCOLN NORTHEAST
 DL6622  PID         -  DL6622
 DL6622  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6622  COUNTRY     -  US
 DL6622  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6622
 DL6622                         *CURRENT SURVEY CONTROL
 DL6622  ______________________________________________________________________
 DL6622* NAD 83(1986) POSITION- 38 53 21.80   (N) 077 02 59.18   (W)   HD_HELD1
 DL6622* NAVD 88 ORTHO HEIGHT -    11.078 (meters)       36.35  (feet) ADJUSTED
 DL6622  ______________________________________________________________________
 DL6622  GEOID HEIGHT    -        -32.070 (meters)                     GEOID18
 DL6622  DYNAMIC HEIGHT  -         11.072 (meters)       36.33  (feet) COMP
 DL6622  MODELED GRAVITY -    980,095.7   (mgal)                       NAVD 88
 DL6622
 DL6622  VERT ORDER      -  FIRST     CLASS II
 DL6622
 DL6622.The horizontal coordinates were determined by differentially corrected
 DL6622.hand held GPS observations or other comparable positioning techniques
 DL6622.and have an estimated accuracy of +/- 3 meters.
 DL6622
 DL6622.The orthometric height was determined by differential leveling and
 DL6622.adjusted by the NATIONAL GEODETIC SURVEY
 DL6622.in April 2010.
 DL6622
 DL6622.No vertical observational check was made to the station.
 DL6622
 DL6622.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6622.GEOID18 height accuracy estimate available here.
 DL6622
 DL6622.Click photographs - Photos may exist for this station.
 DL6622
 DL6622.The dynamic height is computed by dividing the NAVD 88
 DL6622.geopotential number by the normal gravity value computed on the
 DL6622.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6622.degrees latitude (g = 980.6199 gals.).
 DL6622
 DL6622.The modeled gravity was interpolated from observed gravity values.
 DL6622
 DL6622
 DL6622_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2222206499(NAD 83)
 DL6622
 DL6622                          SUPERSEDED SURVEY CONTROL
 DL6622
 DL6622.No superseded survey control is available for this station.
 DL6622
 DL6622_MARKER: Z = SEE DESCRIPTION
 DL6622_SP_SET: BUILDING
 DL6622_MARK LOGO: NONE
 DL6622_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 DL6622_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 DL6622+SATELLITE: SATELLITE OBSERVATIONS - December 11, 2021
 DL6622
 DL6622  HISTORY     - Date     Condition        Report By
 DL6622  HISTORY     - 20081212 MONUMENTED       NGS
 DL6622  HISTORY     - 20100301 GOOD             NGS
 DL6622  HISTORY     - 20211211 GOOD             USPSQD
 DL6622
 DL6622                          STATION DESCRIPTION
 DL6622
 DL6622'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6622'THE MARK IS LOCATED ON THE NORTHEAST CORNER OF THE LINCOLN MEMORIAL.
 DL6622'
 DL6622'THE MARK CONSISTS OF A 1-INCH (3 CM) DIAMETER BY 3.5 INCHES (9 CM)
 DL6622'LONG STAINLESS STEEL PIPE SET IN THE WALL AND A STAINLESS STEEL SCREW
 DL6622'PLUG, SCREWED INTO THE PIPE AND FLUSH WITH THE WALL.
 DL6622'
 DL6622'IT IS 8 FT (2.4 M) NORTHEAST OF A COLUMN, 22 FT (6.7 M) SOUTHWEST OF
 DL6622'THE RAMP RETAINING WALL EDGE AND 15.8 FT (4.8 M) SOUTH OF SHOP
 DL6622'DOORWAY.
 DL6622
 DL6622                          STATION RECOVERY (2010)
 DL6622
 DL6622'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2010 (DRD)
 DL6622'RECOVERED AS DESCRIBED.
 DL6622
 DL6622                          STATION RECOVERY (2021)
 DL6622
 DL6622'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 DL6622'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6621 ***********************************************************************
 DL6621  DESIGNATION -  LINCOLN SOUTHEAST
 DL6621  PID         -  DL6621
 DL6621  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6621  COUNTRY     -  US
 DL6621  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6621
 DL6621                         *CURRENT SURVEY CONTROL
 DL6621  ______________________________________________________________________
 DL6621* NAD 83(1986) POSITION- 38 53 20.89   (N) 077 02 59.19   (W)   HD_HELD1
 DL6621* NAVD 88 ORTHO HEIGHT -    11.064 (meters)       36.30  (feet) ADJUSTED
 DL6621  ______________________________________________________________________
 DL6621  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 DL6621  DYNAMIC HEIGHT  -         11.058 (meters)       36.28  (feet) COMP
 DL6621  MODELED GRAVITY -    980,095.7   (mgal)                       NAVD 88
 DL6621
 DL6621  VERT ORDER      -  FIRST     CLASS II
 DL6621
 DL6621.The horizontal coordinates were determined by differentially corrected
 DL6621.hand held GPS observations or other comparable positioning techniques
 DL6621.and have an estimated accuracy of +/- 3 meters.
 DL6621
 DL6621.The orthometric height was determined by differential leveling and
 DL6621.adjusted by the NATIONAL GEODETIC SURVEY
 DL6621.in April 2010.
 DL6621
 DL6621.No vertical observational check was made to the station.
 DL6621
 DL6621.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6621.GEOID18 height accuracy estimate available here.
 DL6621
 DL6621.Click photographs - Photos may exist for this station.
 DL6621
 DL6621.The dynamic height is computed by dividing the NAVD 88
 DL6621.geopotential number by the normal gravity value computed on the
 DL6621.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6621.degrees latitude (g = 980.6199 gals.).
 DL6621
 DL6621.The modeled gravity was interpolated from observed gravity values.
 DL6621
 DL6621
 DL6621_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2222106470(NAD 83)
 DL6621
 DL6621                          SUPERSEDED SURVEY CONTROL
 DL6621
 DL6621.No superseded survey control is available for this station.
 DL6621
 DL6621_MARKER: Z = SEE DESCRIPTION
 DL6621_SP_SET: BUILDING
 DL6621_MARK LOGO: NONE
 DL6621_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 DL6621_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 DL6621+SATELLITE: SATELLITE OBSERVATIONS - December 11, 2021
 DL6621
 DL6621  HISTORY     - Date     Condition        Report By
 DL6621  HISTORY     - 20081212 MONUMENTED       NGS
 DL6621  HISTORY     - 20120301 GOOD             NGS
 DL6621  HISTORY     - 20211211 GOOD             USPSQD
 DL6621
 DL6621                          STATION DESCRIPTION
 DL6621
 DL6621'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6621'THE MARK IS LOCATED AT THE LINCOLN MEMORIAL IN THE SOUTHEAST CORNER OF
 DL6621'THE BUILDING.
 DL6621'
 DL6621'THE MARK CONSISTS OF A 1-INCH (3 CM) DIAMETER BY 3.5 INCHES (9 CM)
 DL6621'LONG STAINLESS STEEL PIPE SET IN THE WALL AND A STAINLESS STEEL SCREW
 DL6621'PLUG, SCREWED INTO THE PIPE AND FLUSH WITH THE WALL.
 DL6621'
 DL6621'IT IS 16.8 FT (5.1 M) SOUTHEAST OF A DOORWAY, 21.3 FT (6.5 M) NORTH OF
 DL6621'THE EDGE OF THE RAMP RETAINING WALL AND 8.2 FT (2.5 M) WEST OF THE
 DL6621'SOUTHEAST CORNER COLUMN.
 DL6621
 DL6621                          STATION RECOVERY (2012)
 DL6621
 DL6621'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DL6621'RECOVERED AS DESCRIBED.
 DL6621
 DL6621                          STATION RECOVERY (2021)
 DL6621
 DL6621'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 DL6621'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6623 ***********************************************************************
 DL6623  DESIGNATION -  LINCOLN WEST
 DL6623  PID         -  DL6623
 DL6623  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6623  COUNTRY     -  US
 DL6623  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6623
 DL6623                         *CURRENT SURVEY CONTROL
 DL6623  ______________________________________________________________________
 DL6623* NAD 83(1986) POSITION- 38 53 21.57   (N) 077 03 01.80   (W)   HD_HELD1
 DL6623* NAVD 88 ORTHO HEIGHT -    10.317 (meters)       33.85  (feet) ADJUSTED
 DL6623  ______________________________________________________________________
 DL6623  GEOID HEIGHT    -        -32.069 (meters)                     GEOID18
 DL6623  DYNAMIC HEIGHT  -         10.312 (meters)       33.83  (feet) COMP
 DL6623  MODELED GRAVITY -    980,095.6   (mgal)                       NAVD 88
 DL6623
 DL6623  VERT ORDER      -  FIRST     CLASS II
 DL6623
 DL6623.The horizontal coordinates were determined by differentially corrected
 DL6623.hand held GPS observations or other comparable positioning techniques
 DL6623.and have an estimated accuracy of +/- 3 meters.
 DL6623
 DL6623.The orthometric height was determined by differential leveling and
 DL6623.adjusted by the NATIONAL GEODETIC SURVEY
 DL6623.in April 2010.
 DL6623
 DL6623.No vertical observational check was made to the station.
 DL6623
 DL6623.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6623.GEOID18 height accuracy estimate available here.
 DL6623
 DL6623.Click photographs - Photos may exist for this station.
 DL6623
 DL6623.The dynamic height is computed by dividing the NAVD 88
 DL6623.geopotential number by the normal gravity value computed on the
 DL6623.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6623.degrees latitude (g = 980.6199 gals.).
 DL6623
 DL6623.The modeled gravity was interpolated from observed gravity values.
 DL6623
 DL6623
 DL6623_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2215906493(NAD 83)
 DL6623
 DL6623                          SUPERSEDED SURVEY CONTROL
 DL6623
 DL6623.No superseded survey control is available for this station.
 DL6623
 DL6623_MARKER: Z = SEE DESCRIPTION
 DL6623_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 DL6623_SP_SET: BUILDING
 DL6623_MARK LOGO: NONE
 DL6623_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 DL6623_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 DL6623+SATELLITE: SATELLITE OBSERVATIONS - December 11, 2021
 DL6623
 DL6623  HISTORY     - Date     Condition        Report By
 DL6623  HISTORY     - 20081212 MONUMENTED       NGS
 DL6623  HISTORY     - 20120301 GOOD             NGS
 DL6623  HISTORY     - 20211211 GOOD             USPSQD
 DL6623
 DL6623                          STATION DESCRIPTION
 DL6623
 DL6623'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6623'THE MARK IS LOCATED ON THE WEST SIDE OF THE LINCOLN MEMORIAL.
 DL6623'
 DL6623'THE MARK CONSISTS OF A 1-INCH (3 CM) DIAMETER BY 3.5 INCHES (9 CM)
 DL6623'LONG STAINLESS STEEL PIPE SET IN THE WALL AND A STAINLESS STEEL SCREW
 DL6623'PLUG, SCREWED INTO THE PIPE AND FLUSH WITH THE WALL.
 DL6623'
 DL6623'IT IS 101.1 FT (30.8 M) SOUTHWEST OF THE NORTH CORNER OF THE WEST
 DL6623'FACING WALL, 48.1 FT (14.7 M) NORTH OF A SPRINKLER CONTROL BOX AND
 DL6623'201.3 FT (61.4 M) EAST OF A RETAINING WALL CIRCLING THE MEMORIAL.
 DL6623
 DL6623                          STATION RECOVERY (2012)
 DL6623
 DL6623'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DL6623'RECOVERED AS DESCRIBED.
 DL6623
 DL6623                          STATION RECOVERY (2021)
 DL6623
 DL6623'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 DL6623'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9355 ***********************************************************************
 HV9355  DESIGNATION -  LOCRAFT NORTH
 HV9355  PID         -  HV9355
 HV9355  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9355  COUNTRY     -  US
 HV9355  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9355
 HV9355                         *CURRENT SURVEY CONTROL
 HV9355  ______________________________________________________________________
 HV9355* NAD 83(1993) POSITION- 38 53 26.24733(N) 077 00 32.61406(W)   NO CHECK
 HV9355* NAVD 88 ORTHO HEIGHT -    28.    (meters)       92.    (feet) VERT ANG
 HV9355  ______________________________________________________________________
 HV9355  GEOID HEIGHT    -        -32.126 (meters)                     GEOID18
 HV9355  LAPLACE CORR    -         -3.30  (seconds)                    DEFLEC18
 HV9355  HORZ ORDER      -  THIRD
 HV9355
 HV9355.The horizontal coordinates were established by classical geodetic methods
 HV9355.and adjusted by the National Geodetic Survey in November 1994.
 HV9355
 HV9355.No horizontal observational check was made to the station.
 HV9355
 HV9355.The orthometric height was determined by vertical angle observations.
 HV9355
 HV9355.No vertical observational check was made to the station.
 HV9355
 HV9355.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9355.GEOID18 height accuracy estimate available here.
 HV9355
 HV9355.Click photographs - Photos may exist for this station.
 HV9355
 HV9355.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9355
 HV9355. The following values were computed from the NAD 83(1993) position.
 HV9355
 HV9355;                    North         East     Units Scale Factor Converg.
 HV9355;SPC MD       -   135,864.559   399,214.044   MT  0.99994988   -0 00 20.5
 HV9355;SPC MD       -   445,748.97  1,309,754.74   sFT  0.99994988   -0 00 20.5
 HV9355;SPC VA N     - 2,136,909.693 3,629,342.529   MT  0.99995972   +0 55 49.9
 HV9355;SPC VA N     - 7,010,844.55 11,907,267.95   sFT  0.99995972   +0 55 49.9
 HV9355;UTM  18      - 4,306,557.562   325,756.859   MT  0.99997387   -1 15 42.0
 HV9355
 HV9355!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9355!SPC MD       -   1.00000071  x   0.99994988  =   0.99995059
 HV9355!SPC VA N     -   1.00000071  x   0.99995972  =   0.99996043
 HV9355!UTM  18      -   1.00000071  x   0.99997387  =   0.99997458
 HV9355
 HV9355_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2575606557(NAD 83)
 HV9355
 HV9355                          SUPERSEDED SURVEY CONTROL
 HV9355
 HV9355  NAD 83(1991)-  38 53 26.24799(N)    077 00 32.61399(W) AD(       ) 3
 HV9355
 HV9355.Superseded values are not recommended for survey control.
 HV9355
 HV9355.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9355.See file dsdata.pdf to determine how the superseded data were derived.
 HV9355
 HV9355_MARKER: N = NAIL
 HV9355_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV9355_SP_SET: SET IN FLOOR
 HV9355_MARK LOGO: LOCENG
 HV9355_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9355_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9355_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9355+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9355
 HV9355  HISTORY     - Date     Condition        Report By
 HV9355  HISTORY     - 1992     MONUMENTED       LOCENG
 HV9355
 HV9355                          STATION DESCRIPTION
 HV9355
 HV9355'DESCRIBED BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1992
 HV9355'STATION IS LOCATED ON THE FIRST FLOOR OF THE CAPITOL IN THE SENATE
 HV9355'WING NEAR THE CENTER OF THE INTERSECTION OF THE HALLWAY LEADING TO
 HV9355'THE SENATE DOOR AND THE MAIN NORTH-SOUTH HALLWAY OF THE CAPITOL.  THE
 HV9355'STATION IS 3.44 METERS (11.29 FT) EAST OF THE WEST WALL OF THE
 HV9355'HALLWAY, 5.94 METERS (19.49 FT) SOUTH OF THE SOUTHEAST CORNER OF THE
 HV9355'WEST SIDE OF AN ARCHWAY, AND 3.30 METERS (10.83 FT) WEST OF THE EAST
 HV9355'WALL OF THE HALLWAY.  STATION IS MARKED BY A 2 MILLIMETER COPPER NAIL
 HV9355'SET BETWEEN FLOOR TILES.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9358 ***********************************************************************
 HV9358  DESIGNATION -  LOCRAFT SOUTH
 HV9358  PID         -  HV9358
 HV9358  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9358  COUNTRY     -  US
 HV9358  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9358
 HV9358                         *CURRENT SURVEY CONTROL
 HV9358  ______________________________________________________________________
 HV9358* NAD 83(1993) POSITION- 38 53 20.38719(N) 077 00 32.61841(W)   NO CHECK
 HV9358* NAVD 88 ORTHO HEIGHT -    28.    (meters)       92.    (feet) VERT ANG
 HV9358  ______________________________________________________________________
 HV9358  GEOID HEIGHT    -        -32.129 (meters)                     GEOID18
 HV9358  LAPLACE CORR    -         -3.27  (seconds)                    DEFLEC18
 HV9358  HORZ ORDER      -  THIRD
 HV9358
 HV9358.The horizontal coordinates were established by classical geodetic methods
 HV9358.and adjusted by the National Geodetic Survey in November 1994.
 HV9358
 HV9358.No horizontal observational check was made to the station.
 HV9358
 HV9358.The orthometric height was determined by vertical angle observations.
 HV9358
 HV9358.No vertical observational check was made to the station.
 HV9358
 HV9358.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9358.GEOID18 height accuracy estimate available here.
 HV9358
 HV9358.Click photographs - Photos may exist for this station.
 HV9358
 HV9358.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9358
 HV9358. The following values were computed from the NAD 83(1993) position.
 HV9358
 HV9358;                    North         East     Units Scale Factor Converg.
 HV9358;SPC MD       -   135,683.858   399,213.921   MT  0.99994987   -0 00 20.5
 HV9358;SPC MD       -   445,156.12  1,309,754.34   sFT  0.99994987   -0 00 20.5
 HV9358;SPC VA N     - 2,136,729.013 3,629,345.359   MT  0.99995958   +0 55 49.9
 HV9358;SPC VA N     - 7,010,251.77 11,907,277.23   sFT  0.99995958   +0 55 49.9
 HV9358;UTM  18      - 4,306,376.903   325,752.775   MT  0.99997388   -1 15 41.9
 HV9358
 HV9358!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9358!SPC MD       -   1.00000071  x   0.99994987  =   0.99995058
 HV9358!SPC VA N     -   1.00000071  x   0.99995958  =   0.99996029
 HV9358!UTM  18      -   1.00000071  x   0.99997388  =   0.99997459
 HV9358
 HV9358_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2575206376(NAD 83)
 HV9358
 HV9358                          SUPERSEDED SURVEY CONTROL
 HV9358
 HV9358  NAD 83(1991)-  38 53 20.38785(N)    077 00 32.61851(W) AD(       ) 3
 HV9358
 HV9358.Superseded values are not recommended for survey control.
 HV9358
 HV9358.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9358.See file dsdata.pdf to determine how the superseded data were derived.
 HV9358
 HV9358_MARKER: N = NAIL
 HV9358_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV9358_SP_SET: SET IN FLOOR
 HV9358_MARK LOGO: LOCENG
 HV9358_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9358_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9358_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9358+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9358
 HV9358  HISTORY     - Date     Condition        Report By
 HV9358  HISTORY     - 1992     MONUMENTED       LOCENG
 HV9358
 HV9358                          STATION DESCRIPTION
 HV9358
 HV9358'DESCRIBED BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1992
 HV9358'STATION IS LOCATED ON THE FIRST FLOOR OF THE CAPITOL IN THE HOUSE WING
 HV9358'AT THE INTERSECTION OF A HALLWAY RUNNING WEST FROM THE HOUSE DOOR AND
 HV9358'THE MAIN NORTH-SOUTH HALLWAY OF THE CAPITOL.  THE STATION IS 2.31
 HV9358'METERS (7.58 FT) NORTHWEST OF THE NORTHWEST CORNER OF THE STATUE OF
 HV9358'MORTON FROM INDIANA, 2.39 METERS (7.84 FT) EAST-NORTHEAST OF THE
 HV9358'NORTHEAST CORNER OF THE STATUE OF CURRY FROM ALABAMA, 4.33 METERS
 HV9358'(14.21 FT) SOUTHWEST OF THE SOUTHWEST CORNER OF THE STATUE OF
 HV9358'WINTHROP FROM MASSACHUSETTS, AND 4.24 METERS (13.91 FT) SOUTHEAST OF
 HV9358'THE SOUTHEAST CORNER OF THE STATUE OF CLARKE FROM ARKANSAS.  STATION
 HV9358'IS MARKED BY A 2 MILLIMETER COPPER NAIL SET BETWEEN FLOOR TILES.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4240 ***********************************************************************
 HV4240  DESIGNATION -  LONGFELLOW 1960
 HV4240  PID         -  HV4240
 HV4240  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4240  COUNTRY     -  US
 HV4240  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4240
 HV4240                         *CURRENT SURVEY CONTROL
 HV4240  ______________________________________________________________________
 HV4240* NAD 83(1993) POSITION- 38 54 22.39005(N) 077 02 26.15052(W)   ADJUSTED
 HV4240* NAVD 88 ORTHO HEIGHT -    18.    (meters)       59.    (feet) SCALED
 HV4240  ______________________________________________________________________
 HV4240  GEOID HEIGHT    -        -32.049 (meters)                     GEOID18
 HV4240  LAPLACE CORR    -         -2.13  (seconds)                    DEFLEC18
 HV4240  HORZ ORDER      -  SECOND
 HV4240
 HV4240.The horizontal coordinates were established by classical geodetic methods
 HV4240.and adjusted by the National Geodetic Survey in November 1994.
 HV4240
 HV4240.The orthometric height was scaled from a topographic map.
 HV4240
 HV4240.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4240.GEOID18 height accuracy estimate available here.
 HV4240
 HV4240.Click photographs - Photos may exist for this station.
 HV4240
 HV4240.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4240
 HV4240. The following values were computed from the NAD 83(1993) position.
 HV4240
 HV4240;                    North         East     Units Scale Factor Converg.
 HV4240;SPC MD       -   137,596.494   396,478.735   MT  0.99994999   -0 01 31.7
 HV4240;SPC MD       -   451,431.16  1,300,780.65   sFT  0.99994999   -0 01 31.7
 HV4240;SPC VA N     - 2,138,596.720 3,626,579.256   MT  0.99996105   +0 54 39.0
 HV4240;SPC VA N     - 7,016,379.41 11,898,202.11   sFT  0.99996105   +0 54 39.0
 HV4240;UTM  18      - 4,308,349.102   323,060.096   MT  0.99998553   -1 16 54.9
 HV4240
 HV4240!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4240!SPC MD       -   1.00000224  x   0.99994999  =   0.99995223
 HV4240!SPC VA N     -   1.00000224  x   0.99996105  =   0.99996329
 HV4240!UTM  18      -   1.00000224  x   0.99998553  =   0.99998777
 HV4240
 HV4240:                Primary Azimuth Mark                     Grid Az
 HV4240:SPC MD       -  N W 119 A 1960                           326 24 27.8
 HV4240:SPC VA N     -  N W 119 A 1960                           325 28 17.1
 HV4240:UTM  18      -  N W 119 A 1960                           327 39 51.0
 HV4240
 HV4240_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2306008349(NAD 83)
 HV4240
 HV4240|---------------------------------------------------------------------|
 HV4240| PID    Reference Object                     Distance      Geod. Az  |
 HV4240|                                                           dddmmss.s |
 HV4240| HV4258 N W 119 A 1960                      449.837 METERS 3262256.1 |
 HV4240|---------------------------------------------------------------------|
 HV4240
 HV4240                          SUPERSEDED SURVEY CONTROL
 HV4240
 HV4240  NAD 83(1991)-  38 54 22.38895(N)    077 02 26.15181(W) AD(       ) 2
 HV4240  NAD 83(1986)-  38 54 22.38855(N)    077 02 26.16233(W) AD(       ) 2
 HV4240  NAD 27      -  38 54 21.98680(N)    077 02 27.24400(W) AD(       ) 2
 HV4240
 HV4240.Superseded values are not recommended for survey control.
 HV4240
 HV4240.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4240.See file dsdata.pdf to determine how the superseded data were derived.
 HV4240
 HV4240_MARKER: N = NAIL
 HV4240_SETTING: 0 = UNSPECIFIED SETTING
 HV4240_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4240
 HV4240  HISTORY     - Date     Condition        Report By
 HV4240  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4240  HISTORY     - 1964     MARK NOT FOUND   CGS
 HV4240
 HV4240                          STATION DESCRIPTION
 HV4240
 HV4240'DESCRIBED BY COAST AND GEODETIC SURVEY 1964 (RWT)
 HV4240'STATION WAS SEARCHED FOR BUT NOT FOUND.  LIGHT WAS SHOWN AS PER
 HV4240'THE FOLLOWING SKETCH AND MEASUREMENTS.  WITH THESE MEASUREMENTS
 HV4240'I REMOVED THE TAR IN SEARCH OF THE STATION BUT COULD NOT FIND
 HV4240'THE NAIL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1880 ***********************************************************************
 HV1880  DESIGNATION -  M 1
 HV1880  PID         -  HV1880
 HV1880  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1880  COUNTRY     -  US
 HV1880  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1880
 HV1880                         *CURRENT SURVEY CONTROL
 HV1880  ______________________________________________________________________
 HV1880* NAD 83(1986) POSITION- 38 54 21.     (N) 077 04 46.     (W)   SCALED
 HV1880* NAVD 88 ORTHO HEIGHT -    13.788 (meters)       45.24  (feet) ADJUSTED
 HV1880  ______________________________________________________________________
 HV1880  GEOID HEIGHT    -        -31.999 (meters)                     GEOID18
 HV1880  DYNAMIC HEIGHT  -         13.781 (meters)       45.21  (feet) COMP
 HV1880  MODELED GRAVITY -    980,091.6   (mgal)                       NAVD 88
 HV1880
 HV1880  VERT ORDER      -  FIRST     CLASS II
 HV1880
 HV1880.The horizontal coordinates were scaled from a map and have
 HV1880.an estimated accuracy of +/- 6 seconds.
 HV1880
 HV1880.The orthometric height was determined by differential leveling and
 HV1880.adjusted by the NATIONAL GEODETIC SURVEY
 HV1880.in June 1991.
 HV1880
 HV1880.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1880.GEOID18 height accuracy estimate available here.
 HV1880
 HV1880.Click photographs - Photos may exist for this station.
 HV1880
 HV1880.The dynamic height is computed by dividing the NAVD 88
 HV1880.geopotential number by the normal gravity value computed on the
 HV1880.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1880.degrees latitude (g = 980.6199 gals.).
 HV1880
 HV1880.The modeled gravity was interpolated from observed gravity values.
 HV1880
 HV1880
 HV1880_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ196083(NAD 83)
 HV1880
 HV1880                          SUPERSEDED SURVEY CONTROL
 HV1880
 HV1880  NGVD 29 (11/26/84)   14.019  (m)           45.99   (f) ADJUSTED    1 2
 HV1880
 HV1880.Superseded values are not recommended for survey control.
 HV1880
 HV1880.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1880.See file dsdata.pdf to determine how the superseded data were derived.
 HV1880
 HV1880_MARKER: DB = BENCH MARK DISK
 HV1880_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1880_SP_SET: CONCRETE WALL
 HV1880_STAMPING: M 1 1925
 HV1880_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1880
 HV1880  HISTORY     - Date     Condition        Report By
 HV1880  HISTORY     - 1925     MONUMENTED       CGS
 HV1880  HISTORY     - 1943     GOOD             CGS
 HV1880  HISTORY     - 1979     GOOD             NGS
 HV1880  HISTORY     - 19950617 MARK NOT FOUND   USPSQD
 HV1880
 HV1880                          STATION DESCRIPTION
 HV1880
 HV1880'DESCRIBED BY COAST AND GEODETIC SURVEY 1925
 HV1880'AT WASHINGTON.
 HV1880'AT WASHINGTON, ON CANAL ROAD NORTHWEST, NEAR THE INTERSECTION OF
 HV1880'FOXHALL ROAD, 20 YARDS SOUTHEAST OF THE POINT OF INTERSECTION
 HV1880'OF THE SOUTH CURB OF FOXHALL ROAD AND THE NORTH CURB OF CANAL
 HV1880'ROAD, ON THE SOUTH SIDE OF CANAL ROAD, OPPOSITE AN OUTLET GATE
 HV1880'IN THE TOWPATH OF THE CHESAPAKEA AND OHIO CANAL, AND IN THE TOP
 HV1880'OF THE MASONRY WALL BETWEEN CANAL ROAD AND THE CANAL.  A STANDARD
 HV1880'DISK, STAMPED M 1 1925.
 HV1880
 HV1880                          STATION RECOVERY (1943)
 HV1880
 HV1880'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943
 HV1880'RECOVERED IN GOOD CONDITION.
 HV1880
 HV1880                          STATION RECOVERY (1979)
 HV1880
 HV1880'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1880'RECOVERED IN GOOD CONDITION.
 HV1880
 HV1880                          STATION RECOVERY (1995)
 HV1880
 HV1880'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1880'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9066 ***********************************************************************
 HV9066  DESIGNATION -  M 1 RESET
 HV9066  PID         -  HV9066
 HV9066  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9066  COUNTRY     -  US
 HV9066  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9066
 HV9066                         *CURRENT SURVEY CONTROL
 HV9066  ______________________________________________________________________
 HV9066* NAD 83(1986) POSITION- 38 53 20.     (N) 077 02 57.     (W)   SCALED
 HV9066* NAVD 88 ORTHO HEIGHT -     8.525 (meters)       27.97  (feet) ADJUSTED
 HV9066  ______________________________________________________________________
 HV9066  GEOID HEIGHT    -        -32.072 (meters)                     GEOID18
 HV9066  DYNAMIC HEIGHT  -          8.520 (meters)       27.95  (feet) COMP
 HV9066  MODELED GRAVITY -    980,095.8   (mgal)                       NAVD 88
 HV9066
 HV9066  VERT ORDER      -  FIRST     CLASS II
 HV9066
 HV9066.The horizontal coordinates were scaled from a map and have
 HV9066.an estimated accuracy of +/- 6 seconds.
 HV9066
 HV9066.The orthometric height was determined by differential leveling and
 HV9066.adjusted by the NATIONAL GEODETIC SURVEY
 HV9066.in February 1993.
 HV9066
 HV9066.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9066.GEOID18 height accuracy estimate available here.
 HV9066
 HV9066.Click photographs - Photos may exist for this station.
 HV9066
 HV9066.The dynamic height is computed by dividing the NAVD 88
 HV9066.geopotential number by the normal gravity value computed on the
 HV9066.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV9066.degrees latitude (g = 980.6199 gals.).
 HV9066
 HV9066.The modeled gravity was interpolated from observed gravity values.
 HV9066
 HV9066
 HV9066_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ222064(NAD 83)
 HV9066
 HV9066                          SUPERSEDED SURVEY CONTROL
 HV9066
 HV9066  NGVD 29 (08/12/92)    8.760  (m)           28.74   (f) ADJUSTED    1 2
 HV9066
 HV9066.Superseded values are not recommended for survey control.
 HV9066
 HV9066.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9066.See file dsdata.pdf to determine how the superseded data were derived.
 HV9066
 HV9066_MARKER: Z = SEE DESCRIPTION
 HV9066_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
 HV9066_SP_SET: RETAINING WALL
 HV9066_MARK LOGO: NONE
 HV9066_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV9066_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV9066+STABILITY: SURFACE MOTION
 HV9066_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9066+SATELLITE: SATELLITE OBSERVATIONS - May 13, 1992
 HV9066
 HV9066  HISTORY     - Date     Condition        Report By
 HV9066  HISTORY     - UNK      MONUMENTED       NONE
 HV9066  HISTORY     - 19920513 GOOD             NGS
 HV9066  HISTORY     - 20070919 MARK NOT FOUND   USACE
 HV9066
 HV9066                          STATION DESCRIPTION
 HV9066
 HV9066'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9066'IN WASHINGTON, D.C., AT THE LINCOLN MEMORIAL, THE POINT LEVELED IS THE
 HV9066'STEM OF THE ORIGINAL DISK NEAR THE CENTER OF THE 6TH STONE SOUTH OF A
 HV9066'PILLAR AT THE SOUTH EDGE OF THE STEPS LEADING TO THE EAST ENTRANCE TO
 HV9066'THE MONUMENT, 26.5 M (86.9 FT) SOUTH OF THE CENTER OF THE LOWER 8
 HV9066'STEPS LEADING TO THE MONUMENT, 9.8 M (32.2 FT) WEST OF THE WEST CURB
 HV9066'OF A CIRCLE DRIVEWAY, AND 1.5 M (4.9 FT) ABOVE THE LEVEL OF THE
 HV9066'DRIVEWAY.
 HV9066
 HV9066                          STATION RECOVERY (2007)
 HV9066
 HV9066'RECOVERY NOTE BY US ARMY CORPS OF ENGINEERS 2007 (JBC)
 HV9066'IT APPEARS AS THOUGH NEW CAPSTONE(S) MAY COVER THE STEM OF ORIGINAL
 HV9066'MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2001 ***********************************************************************
 HV2001  DESIGNATION -  M 10
 HV2001  PID         -  HV2001
 HV2001  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2001  COUNTRY     -  US
 HV2001  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2001
 HV2001                         *CURRENT SURVEY CONTROL
 HV2001  ______________________________________________________________________
 HV2001* NAD 83(1986) POSITION- 38 52 49.     (N) 077 02 26.     (W)   SCALED
 HV2001* NAVD 88 ORTHO HEIGHT -     0.740 (meters)        2.43  (feet) ADJUSTED
 HV2001  ______________________________________________________________________
 HV2001  GEOID HEIGHT    -        -32.099 (meters)                     GEOID18
 HV2001  DYNAMIC HEIGHT  -          0.740 (meters)        2.43  (feet) COMP
 HV2001  MODELED GRAVITY -    980,096.6   (mgal)                       NAVD 88
 HV2001
 HV2001  VERT ORDER      -  FIRST     CLASS I
 HV2001
 HV2001.The horizontal coordinates were scaled from a map and have
 HV2001.an estimated accuracy of +/- 6 seconds.
 HV2001
 HV2001.The orthometric height was determined by differential leveling and
 HV2001.adjusted by the NATIONAL GEODETIC SURVEY
 HV2001.in June 1991.
 HV2001
 HV2001.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2001.GEOID18 height accuracy estimate available here.
 HV2001
 HV2001.Click photographs - Photos may exist for this station.
 HV2001
 HV2001.The dynamic height is computed by dividing the NAVD 88
 HV2001.geopotential number by the normal gravity value computed on the
 HV2001.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2001.degrees latitude (g = 980.6199 gals.).
 HV2001
 HV2001.The modeled gravity was interpolated from observed gravity values.
 HV2001
 HV2001
 HV2001_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ229054(NAD 83)
 HV2001
 HV2001                          SUPERSEDED SURVEY CONTROL
 HV2001
 HV2001  NGVD 29 (11/26/84)    0.976  (m)            3.20   (f) ADJUSTED    1 1
 HV2001
 HV2001.Superseded values are not recommended for survey control.
 HV2001
 HV2001.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2001.See file dsdata.pdf to determine how the superseded data were derived.
 HV2001
 HV2001_MARKER: DD = SURVEY DISK
 HV2001_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
 HV2001_SP_SET: SEAWALL
 HV2001_STAMPING: M 10
 HV2001_MARK LOGO: PBPP
 HV2001_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV2001+STABILITY: SURFACE MOTION
 HV2001
 HV2001  HISTORY     - Date     Condition        Report By
 HV2001  HISTORY     - UNK      MONUMENTED       PBPP
 HV2001  HISTORY     - 1971     POOR             NGS
 HV2001
 HV2001                          STATION DESCRIPTION
 HV2001
 HV2001'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV2001'AT WASHINGTON.
 HV2001'AT WASHINGTON, D.C., ABOUT 0.3 MILE NORTHWEST ALONG OHIO DRIVE
 HV2001'FROM THE NORTHEAST END OF THE RICHMOND, FREDERICKSBURG AND POTOMAC
 HV2001'RAILROAD BRIDGE OVER THE POTOMAC RIVER, AT THE OHIO DRIVE BRIDGE
 HV2001'AND INLET GATE TO THE TIDAL BASIN IN WEST POTOMAC PARK, 90.0
 HV2001'FEET SOUTHWEST OF THE NORTHWEST END OF THE SOUTHWEST WALL OF THE
 HV2001'BRIDGE, SET IN THE TOP OF AN ARCHED ROCK SEAWALL, AND ABOUT
 HV2001'12 FEET BELOW THE LEVEL OF THE DRIVE.  NOTE-- THE SEAWALL IS
 HV2001'BADLY WEATHERED AND CRACKED.  THE ELEVATION OF THIS MARK SHOULD
 HV2001'BE USED WITH CAUTION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1834 ***********************************************************************
 HV1834  DESIGNATION -  M 12
 HV1834  PID         -  HV1834
 HV1834  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1834  COUNTRY     -  US
 HV1834  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1834
 HV1834                         *CURRENT SURVEY CONTROL
 HV1834  ______________________________________________________________________
 HV1834* NAD 83(1986) POSITION- 38 53 26.04   (N) 077 01 32.91   (W)   HD_HELD1
 HV1834* NAVD 88 ORTHO HEIGHT -     7.287 (meters)       23.91  (feet) ADJUSTED
 HV1834  ______________________________________________________________________
 HV1834  GEOID HEIGHT    -        -32.099 (meters)                     GEOID18
 HV1834  DYNAMIC HEIGHT  -          7.283 (meters)       23.89  (feet) COMP
 HV1834  MODELED GRAVITY -    980,099.3   (mgal)                       NAVD 88
 HV1834
 HV1834  VERT ORDER      -  FIRST     CLASS II
 HV1834
 HV1834.The horizontal coordinates were determined by differentially corrected
 HV1834.hand held GPS observations or other comparable positioning techniques
 HV1834.and have an estimated accuracy of +/- 3 meters.
 HV1834
 HV1834.The orthometric height was determined by differential leveling and
 HV1834.adjusted by the NATIONAL GEODETIC SURVEY
 HV1834.in October 2012.
 HV1834
 HV1834.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1834.GEOID18 height accuracy estimate available here.
 HV1834
 HV1834.Click photographs - Photos may exist for this station.
 HV1834
 HV1834.The dynamic height is computed by dividing the NAVD 88
 HV1834.geopotential number by the normal gravity value computed on the
 HV1834.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1834.degrees latitude (g = 980.6199 gals.).
 HV1834
 HV1834.The modeled gravity was interpolated from observed gravity values.
 HV1834
 HV1834
 HV1834_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2430306583(NAD 83)
 HV1834
 HV1834                          SUPERSEDED SURVEY CONTROL
 HV1834
 HV1834  NAVD 88 (06/15/91)    7.278  (m)           23.88   (f) SUPERSEDED  1 1
 HV1834  NGVD 29 (11/26/84)    7.513  (m)           24.65   (f) ADJUSTED    1 1
 HV1834
 HV1834.Superseded values are not recommended for survey control.
 HV1834
 HV1834.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1834.See file dsdata.pdf to determine how the superseded data were derived.
 HV1834
 HV1834_MARKER: DD = SURVEY DISK
 HV1834_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1834_SP_SET: STEP
 HV1834_STAMPING: M 12
 HV1834_MARK LOGO: PBPP
 HV1834_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1834_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1834+SATELLITE: SATELLITE OBSERVATIONS - March 23, 2023
 HV1834
 HV1834  HISTORY     - Date     Condition        Report By
 HV1834  HISTORY     - UNK      MONUMENTED       PBPP
 HV1834  HISTORY     - 1971     GOOD             NGS
 HV1834  HISTORY     - 1978     GOOD             DMA
 HV1834  HISTORY     - 1979     GOOD             NGS
 HV1834  HISTORY     - 20050424 GOOD             GEOCAC
 HV1834  HISTORY     - 20090319 GOOD             GEOCAC
 HV1834  HISTORY     - 20100521 GOOD             GEOCAC
 HV1834  HISTORY     - 20120301 GOOD             NGS
 HV1834  HISTORY     - 20180717 GOOD             USPSQD
 HV1834  HISTORY     - 20211211 GOOD             USPSQD
 HV1834  HISTORY     - 20230323 GOOD             INDIV
 HV1834
 HV1834                          STATION DESCRIPTION
 HV1834
 HV1834'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1834'AT WASHINGTON.
 HV1834'AT WASHINGTON, D.C., ABOUT 0.2 MILE WEST ALONG MADISON DRIVE
 HV1834'FROM THE INTERSECTION OF SW 7TH STREET, AT THE SMITHSONIAN
 HV1834'MUSEUM OF NATURAL HISTORY BUILDING, SET IN THE TOP OF THE EAST
 HV1834'END OF THE BOTTOM GRANITE STEP AT THE SOUTH MAIN ENTRANCE TO THE
 HV1834'BUILDING, 36 FEET NORTH OF THE CENTER LINE OF MADISON DRIVE,
 HV1834'0.2 FOOT SOUTH OF THE SOUTH FACE OF THE GRANITE BALUSTRADE,
 HV1834'0.2 FOOT EAST OF THE EAST END OF THE SECOND STEP UP FROM THE
 HV1834'SIDEWALK, AND ABOUT 1 FOOT ABOVE THE LEVEL OF THE DRIVE.
 HV1834
 HV1834                          STATION RECOVERY (1978)
 HV1834
 HV1834'RECOVERY NOTE BY DEFENSE MAP AGENCY 1978
 HV1834'RECOVERED IN GOOD CONDITION.
 HV1834
 HV1834                          STATION RECOVERY (1979)
 HV1834
 HV1834'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1834'RECOVERED IN GOOD CONDITION.
 HV1834
 HV1834                          STATION RECOVERY (2005)
 HV1834
 HV1834'RECOVERY NOTE BY GEOCACHING 2005 (APC)
 HV1834'RECOVERED IN GOOD CONDITION.
 HV1834
 HV1834                          STATION RECOVERY (2009)
 HV1834
 HV1834'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV1834'RECOVERED IN GOOD CONDITION.
 HV1834
 HV1834                          STATION RECOVERY (2010)
 HV1834
 HV1834'RECOVERY NOTE BY GEOCACHING 2010 (MTT)
 HV1834'RECOVERED IN GOOD CONDITION.
 HV1834
 HV1834                          STATION RECOVERY (2012)
 HV1834
 HV1834'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1834'RECOVERED AS DESCRIBED.
 HV1834
 HV1834                          STATION RECOVERY (2018)
 HV1834
 HV1834'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV1834'RECOVERED IN GOOD CONDITION.
 HV1834
 HV1834                          STATION RECOVERY (2021)
 HV1834
 HV1834'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 HV1834'RECOVERED IN GOOD CONDITION.
 HV1834
 HV1834                          STATION RECOVERY (2023)
 HV1834
 HV1834'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2023 (KHL)
 HV1834'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1827 ***********************************************************************
 HV1827  DESIGNATION -  M 13
 HV1827  PID         -  HV1827
 HV1827  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1827  COUNTRY     -  US
 HV1827  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1827
 HV1827                         *CURRENT SURVEY CONTROL
 HV1827  ______________________________________________________________________
 HV1827* NAD 83(1986) POSITION- 38 53 24.18   (N) 077 00 46.71   (W)   HD_HELD1
 HV1827* NAVD 88 ORTHO HEIGHT -     3.355 (meters)       11.01  (feet) ADJUSTED
 HV1827  ______________________________________________________________________
 HV1827  GEOID HEIGHT    -        -32.120 (meters)                     GEOID18
 HV1827  DYNAMIC HEIGHT  -          3.353 (meters)       11.00  (feet) COMP
 HV1827  MODELED GRAVITY -    980,100.6   (mgal)                       NAVD 88
 HV1827  OBS GRAVITY     -    980,105.3   (mgal)                       GRAV_OBS
 HV1827
 HV1827  VERT ORDER      -  FIRST     CLASS II
 HV1827
 HV1827.The horizontal coordinates were determined by differentially corrected
 HV1827.hand held GPS observations or other comparable positioning techniques
 HV1827.and have an estimated accuracy of +/- 3 meters.
 HV1827
 HV1827.The orthometric height was determined by differential leveling and
 HV1827.adjusted by the NATIONAL GEODETIC SURVEY
 HV1827.in October 2012.
 HV1827
 HV1827.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1827.GEOID18 height accuracy estimate available here.
 HV1827
 HV1827.Click photographs - Photos may exist for this station.
 HV1827
 HV1827.The dynamic height is computed by dividing the NAVD 88
 HV1827.geopotential number by the normal gravity value computed on the
 HV1827.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1827.degrees latitude (g = 980.6199 gals.).
 HV1827
 HV1827.The modeled gravity was interpolated from observed gravity values.
 HV1827
 HV1827.The observed gravity was obtained from relative gravimeter ties
 HV1827.to the IGSN71 gravity network.
 HV1827
 HV1827
 HV1827_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2541506501(NAD 83)
 HV1827
 HV1827                          SUPERSEDED SURVEY CONTROL
 HV1827
 HV1827  NAVD 88 (06/15/91)    3.361  (m)           11.03   (f) SUPERSEDED  1 1
 HV1827  NGVD 29 (11/26/84)    3.597  (m)           11.80   (f) ADJUSTED    1 1
 HV1827
 HV1827.Superseded values are not recommended for survey control.
 HV1827
 HV1827.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1827.See file dsdata.pdf to determine how the superseded data were derived.
 HV1827
 HV1827_MARKER: DB = BENCH MARK DISK
 HV1827_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1827_SP_SET: STEP
 HV1827_STAMPING: M 13
 HV1827_MARK LOGO: PBPP
 HV1827_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1827_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1827+SATELLITE: SATELLITE OBSERVATIONS - March 24, 2023
 HV1827
 HV1827  HISTORY     - Date     Condition        Report By
 HV1827  HISTORY     - UNK      MONUMENTED       PBPP
 HV1827  HISTORY     - 1971     GOOD             NGS
 HV1827  HISTORY     - 1978     GOOD             DMA
 HV1827  HISTORY     - 1979     GOOD             NGS
 HV1827  HISTORY     - 20020811 GOOD             INDIV
 HV1827  HISTORY     - 20051204 GOOD             GEOCAC
 HV1827  HISTORY     - 20090319 GOOD             GEOCAC
 HV1827  HISTORY     - 20100521 GOOD             GEOCAC
 HV1827  HISTORY     - 20120301 GOOD             NGS
 HV1827  HISTORY     - 20160218 SEE DESCRIPTION  PROFLN
 HV1827  HISTORY     - 20211211 GOOD             USPSQD
 HV1827  HISTORY     - 20230324 GOOD             INDIV
 HV1827
 HV1827                          STATION DESCRIPTION
 HV1827
 HV1827'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1827'AT WASHINGTON.
 HV1827'AT WASHINGTON, D.C., ABOUT 0.2 MILE WEST OF THE CAPITOL
 HV1827'BUILDING, AT GRANTS MEMORIAL, SET IN THE TOP OF THE NORTH END OF
 HV1827'THE BOTTOM GRANITE STEP ON THE WEST SIDE OF THE MEMORIAL, 9.2
 HV1827'FEET EAST OF THE NORTHWEST CORNER OF THE BOTTOM STEP, 60.0 FEET
 HV1827'EAST OF A LARGE OVAL POOL, 88.0 FEET NORTH OF THE NORTHWEST CORNER
 HV1827'OF THE MEMORIAL.
 HV1827
 HV1827                          STATION RECOVERY (1978)
 HV1827
 HV1827'RECOVERY NOTE BY DEFENSE MAP AGENCY 1978
 HV1827'RECOVERED IN GOOD CONDITION.
 HV1827
 HV1827                          STATION RECOVERY (1979)
 HV1827
 HV1827'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1827'RECOVERED IN GOOD CONDITION.
 HV1827
 HV1827                          STATION RECOVERY (2002)
 HV1827
 HV1827'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 HV1827'RECOVERED IN GOOD CONDITION.
 HV1827
 HV1827                          STATION RECOVERY (2005)
 HV1827
 HV1827'RECOVERY NOTE BY GEOCACHING 2005 (WD)
 HV1827'RECOVERED IN GOOD CONDITION.
 HV1827
 HV1827                          STATION RECOVERY (2009)
 HV1827
 HV1827'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV1827'RECOVERED IN GOOD CONDITION.
 HV1827
 HV1827                          STATION RECOVERY (2010)
 HV1827
 HV1827'RECOVERY NOTE BY GEOCACHING 2010 (MTT)
 HV1827'RECOVERED IN GOOD CONDITION.
 HV1827
 HV1827                          STATION RECOVERY (2012)
 HV1827
 HV1827'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1827'RECOVERED AS DESCRIBED.
 HV1827
 HV1827                          STATION RECOVERY (2016)
 HV1827
 HV1827'RECOVERY NOTE BY PROFESSIONAL LAND SURVEYOR 2016 (JRO)
 HV1827'REQUEST BY NON-GOVERNMENT SURVEYOR TO USE THIS MARK DENIED BY CAPITOL
 HV1827'POLICE.
 HV1827
 HV1827                          STATION RECOVERY (2021)
 HV1827
 HV1827'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 HV1827'RECOVERED IN GOOD CONDITION.
 HV1827
 HV1827                          STATION RECOVERY (2023)
 HV1827
 HV1827'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2023 (KLH)
 HV1827'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2019 ***********************************************************************
 HV2019  DESIGNATION -  M 14
 HV2019  PID         -  HV2019
 HV2019  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2019  COUNTRY     -  US
 HV2019  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2019
 HV2019                         *CURRENT SURVEY CONTROL
 HV2019  ______________________________________________________________________
 HV2019* NAD 83(1986) POSITION- 38 53 19.     (N) 077 00 32.     (W)   SCALED
 HV2019* NAVD 88 ORTHO HEIGHT -    26.317 (meters)       86.34  (feet) ADJUSTED
 HV2019  ______________________________________________________________________
 HV2019  GEOID HEIGHT    -        -32.130 (meters)                     GEOID18
 HV2019  DYNAMIC HEIGHT  -         26.303 (meters)       86.30  (feet) COMP
 HV2019  MODELED GRAVITY -    980,100.6   (mgal)                       NAVD 88
 HV2019
 HV2019  VERT ORDER      -  FIRST     CLASS II
 HV2019
 HV2019.The horizontal coordinates were scaled from a map and have
 HV2019.an estimated accuracy of +/- 6 seconds.
 HV2019
 HV2019.The orthometric height was determined by differential leveling and
 HV2019.adjusted by the NATIONAL GEODETIC SURVEY
 HV2019.in October 2012.
 HV2019
 HV2019.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2019.GEOID18 height accuracy estimate available here.
 HV2019
 HV2019.Click photographs - Photos may exist for this station.
 HV2019
 HV2019.The dynamic height is computed by dividing the NAVD 88
 HV2019.geopotential number by the normal gravity value computed on the
 HV2019.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2019.degrees latitude (g = 980.6199 gals.).
 HV2019
 HV2019.The modeled gravity was interpolated from observed gravity values.
 HV2019
 HV2019
 HV2019_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ257063(NAD 83)
 HV2019
 HV2019                          SUPERSEDED SURVEY CONTROL
 HV2019
 HV2019  NAVD 88 (06/15/91)   26.311  (m)           86.32   (f) SUPERSEDED  1 1
 HV2019  NGVD 29 (08/12/92)   26.549  (m)           87.10   (f) ADJUSTED    1 1
 HV2019  NGVD 29 (??/??/87)   26.549  (m)           87.10   (f) SUPERSEDED  1 1
 HV2019
 HV2019.Superseded values are not recommended for survey control.
 HV2019
 HV2019.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2019.See file dsdata.pdf to determine how the superseded data were derived.
 HV2019
 HV2019_MARKER: DD = SURVEY DISK
 HV2019_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV2019_SP_SET: STEP
 HV2019_STAMPING: M 14
 HV2019_MARK LOGO: PBPP
 HV2019_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV2019_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2019_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV2019+SATELLITE: SATELLITE OBSERVATIONS - March 01, 2012
 HV2019
 HV2019  HISTORY     - Date     Condition        Report By
 HV2019  HISTORY     - UNK      MONUMENTED       PBPP
 HV2019  HISTORY     - 1971     GOOD             NGS
 HV2019  HISTORY     - 1974     GOOD             NGS
 HV2019  HISTORY     - 19920512 GOOD             NGS
 HV2019  HISTORY     - 20090319 GOOD             GEOCAC
 HV2019  HISTORY     - 20120222 GOOD             NGS
 HV2019  HISTORY     - 20120301 GOOD             NGS
 HV2019
 HV2019                          STATION DESCRIPTION
 HV2019
 HV2019'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV2019'AT WASHINGTON.
 HV2019'AT WASHINGTON, D.C., AT THE HOUSE WING OF THE CAPITOL BUILDING,
 HV2019'SET IN THE TOP OF THE WEST END OF THE BOTTOM GRANITE STEP AT
 HV2019'THE SOUTHEAST CORNER OF THE BUILDING, 118 1/2 FEET EAST OF THE
 HV2019'CENTER OF THE SOUTH ENTRANCE TO THE BUILDING, 0.2 FOOT SOUTH OF
 HV2019'THE SOUTH FACE OF THE WING, 1.2 FEET WEST OF THE SOUTHEAST CORNER
 HV2019'OF THE WATER TABLE ON THE WING, AND 0.7 FOOT ABOVE THE PATIO
 HV2019'WHICH SURROUNDS THE WING.
 HV2019
 HV2019                          STATION RECOVERY (1974)
 HV2019
 HV2019'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974
 HV2019'RECOVERED IN GOOD CONDITION.
 HV2019
 HV2019                          STATION RECOVERY (1992)
 HV2019
 HV2019'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV2019'IN WASHINGTON, D.C., AT THE SOUTH WING OF THE U.S. CAPITOL, IN THE
 HV2019'WEST END OF THE BOTTOM GRANITE STEP AT THE SOUTHEAST CORNER OF THE
 HV2019'BUILDING, 36.1 M (118.4 FT) SOUTH OF THE PROJECTED CENTER OF THE
 HV2019'SOUTH ENTRANCE TO THE BUILDING, 0.4 M (1.3 FT) WEST OF THE SOUTHEAST
 HV2019'CORNER OF THE WATER TABLE, 0.2 M (0.7 FT) ABOVE THE LEVEL OF A PATIO
 HV2019'WHICH SURROUNDS THE WING, AND 0.05 M (0.16 FT) SOUTH OF THE SOUTH
 HV2019'FACE OF THE WING.
 HV2019
 HV2019                          STATION RECOVERY (2009)
 HV2019
 HV2019'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV2019'RECOVERED IN GOOD CONDITION.
 HV2019
 HV2019                          STATION RECOVERY (2012)
 HV2019
 HV2019'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV2019'RECOVERED IN GOOD CONDITION.
 HV2019
 HV2019                          STATION RECOVERY (2012)
 HV2019
 HV2019'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV2019'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1845 ***********************************************************************
 HV1845  DESIGNATION -  M 17
 HV1845  PID         -  HV1845
 HV1845  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1845  COUNTRY     -  US
 HV1845  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1845
 HV1845                         *CURRENT SURVEY CONTROL
 HV1845  ______________________________________________________________________
 HV1845* NAD 83(2011) POSITION- 38 53 17.86826(N) 077 02 15.33851(W)   ADJUSTED
 HV1845* NAD 83(2011) ELLIP HT-   -28.177 (meters)        (06/27/12)   ADJUSTED
 HV1845* NAD 83(2011) EPOCH   -  2010.00
 HV1845* NAVD 88 ORTHO HEIGHT -     3.899 (meters)       12.79  (feet) ADJUSTED
 HV1845  ______________________________________________________________________
 HV1845  GEOID HEIGHT    -        -32.088 (meters)                     GEOID18
 HV1845  NAD 83(2011) X  -  1,115,075.809 (meters)                     COMP
 HV1845  NAD 83(2011) Y  - -4,844,423.720 (meters)                     COMP
 HV1845  NAD 83(2011) Z  -  3,982,654.599 (meters)                     COMP
 HV1845  LAPLACE CORR    -         -2.50  (seconds)                    DEFLEC18
 HV1845  DYNAMIC HEIGHT  -          3.897 (meters)       12.79  (feet) COMP
 HV1845  MODELED GRAVITY -    980,097.4   (mgal)                       NAVD 88
 HV1845
 HV1845  VERT ORDER      -  FIRST     CLASS II
 HV1845
 HV1845  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV1845  Standards:
 HV1845         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV1845            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV1845  -------------------------------------------------------------------
 HV1845  NETWORK    1.88   1.39           0.86   0.64   0.71     -0.10379531
 HV1845  -------------------------------------------------------------------
 HV1845  Click here for local accuracies and other accuracy information.
 HV1845
 HV1845.The horizontal coordinates were established by GPS observations
 HV1845.and adjusted by the National Geodetic Survey in June 2012.
 HV1845
 HV1845.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV1845.been affixed to the stable North American tectonic plate. See 
 HV1845.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV1845
 HV1845.The horizontal coordinates are valid at the epoch date displayed above
 HV1845.which is a decimal equivalence of Year/Month/Day.
 HV1845
 HV1845.The orthometric height was determined by differential leveling and
 HV1845.adjusted by the NATIONAL GEODETIC SURVEY
 HV1845.in May 1999.
 HV1845
 HV1845.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1845.GEOID18 height accuracy estimate available here.
 HV1845
 HV1845.Click photographs - Photos may exist for this station.
 HV1845
 HV1845.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV1845
 HV1845.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1845
 HV1845.The ellipsoidal height was determined by GPS observations
 HV1845.and is referenced to NAD 83.
 HV1845
 HV1845.The dynamic height is computed by dividing the NAVD 88
 HV1845.geopotential number by the normal gravity value computed on the
 HV1845.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1845.degrees latitude (g = 980.6199 gals.).
 HV1845
 HV1845.The modeled gravity was interpolated from observed gravity values.
 HV1845
 HV1845. The following values were computed from the NAD 83(2011) position.
 HV1845
 HV1845;                    North         East     Units Scale Factor Converg.
 HV1845;UTM  18      - 4,306,354.141   323,276.101   MT  0.99998459   -1 16 46.3
 HV1845
 HV1845!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1845!UTM  18      -   1.00000442  x   0.99998459  =   0.99998901
 HV1845
 HV1845_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2327606354(NAD 83)
 HV1845
 HV1845|---------------------------------------------------------------------|
 HV1845| PID    Reference Object                     Distance      Geod. Az  |
 HV1845|                                                           dddmmss.s |
 HV1845| HV4442 WASHINGTON MONUMENT                 242.074 METERS 05732     |
 HV1845|---------------------------------------------------------------------|
 HV1845
 HV1845                          SUPERSEDED SURVEY CONTROL
 HV1845
 HV1845  NAD 83(2007)-  38 53 17.86841(N)    077 02 15.33926(W) AD(2002.00) 0
 HV1845  ELLIP H (02/10/07)  -28.154  (m)                       GP(2002.00)    
 HV1845  NAD 83(1993)-  38 53 17.86846(N)    077 02 15.33895(W) AD(       ) A
 HV1845  ELLIP H (09/11/02)  -28.146  (m)                       GP(       ) 4 2
 HV1845  NAVD 88               3.90   (m)           12.8    (f) LEVELING    3  
 HV1845  NAVD 88 (02/03/93)    3.901  (m)           12.80   (f) SUPERSEDED  1 1
 HV1845  NAVD 88 (06/15/91)    3.896  (m)           12.78   (f) SUPERSEDED  1 1
 HV1845  NGVD 29 (08/12/92)    4.133  (m)           13.56   (f) ADJUSTED    1 1
 HV1845  NGVD 29 (??/??/87)    4.133  (m)           13.56   (f) SUPERSEDED  1 1
 HV1845
 HV1845.Superseded values are not recommended for survey control.
 HV1845
 HV1845.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1845.See file dsdata.pdf to determine how the superseded data were derived.
 HV1845
 HV1845_MARKER: DD = SURVEY DISK
 HV1845_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1845_STAMPING: M 17
 HV1845_MARK LOGO: PBPP
 HV1845_PROJECTION: FLUSH
 HV1845_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1845_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1845+STABILITY: SURFACE MOTION
 HV1845_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1845+SATELLITE: SATELLITE OBSERVATIONS - November 05, 2020
 HV1845
 HV1845  HISTORY     - Date     Condition        Report By
 HV1845  HISTORY     - UNK      MONUMENTED       PBPP
 HV1845  HISTORY     - 1971     GOOD             NGS
 HV1845  HISTORY     - 1979     GOOD             NGS
 HV1845  HISTORY     - 19920513 GOOD             NGS
 HV1845  HISTORY     - 19980928 GOOD             NGS
 HV1845  HISTORY     - 19991122 GOOD             NGS
 HV1845  HISTORY     - 20040226 GOOD             FHWA
 HV1845  HISTORY     - 20070717 GOOD             USACE
 HV1845  HISTORY     - 20081222 GOOD             NGS
 HV1845  HISTORY     - 20090319 GOOD             GEOCAC
 HV1845  HISTORY     - 20100324 GOOD             USACE
 HV1845  HISTORY     - 20100418 GOOD             GEOCAC
 HV1845  HISTORY     - 20120301 GOOD             NGS
 HV1845  HISTORY     - 20180717 GOOD             USPSQD
 HV1845  HISTORY     - 20201105 GOOD             NGS
 HV1845
 HV1845                          STATION DESCRIPTION
 HV1845
 HV1845'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1845'AT WASHINGTON.
 HV1845'AT WASHINGTON, D.C., ABOUT 0.2 MILE WEST-SOUTHWEST OF THE
 HV1845'WASHINGTON MONUMENT, 67.0 FEET NORTHWEST OF THE NORTHWEST SIDE
 HV1845'OF THE STONE OFFICE OF MONUMENTS AND MEMORIALS BUILDING, 37
 HV1845'FEET SOUTHWEST OF THE CENTER LINE OF A PAVED DRIVE, 15 FEET
 HV1845'SOUTH-SOUTHEAST OF A 3-FORKED CATALPA TREE, 17 1/2 FEET NORTHEAST
 HV1845'OF THE FORK OF A 32-INCH 2-FORKED CATALPA TREE, ABOUT 1 FOOT
 HV1845'ABOVE THE LEVEL OF THE DRIVE, AND SET IN THE TOP OF A CONCRETE
 HV1845'POST WHICH IS LEVEL WITH THE SURFACE OF THE GROUND.
 HV1845
 HV1845                          STATION RECOVERY (1979)
 HV1845
 HV1845'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1845'RECOVERED IN GOOD CONDITION.
 HV1845
 HV1845                          STATION RECOVERY (1992)
 HV1845
 HV1845'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1845'1.2 KM (0.75 MI) EASTERLY ALONG INDEPENDENCE AVENUE FROM THE LINCOLN
 HV1845'MEMORIAL IN WASHINGTON, D.C., 41.4 M (135.8 FT) NORTH OF THE NORTH
 HV1845'CURB OF THE EASTBOUND LANES OF THE AVENUE, 20.4 M (66.9 FT) NORTHWEST
 HV1845'OF THE NORTHWEST FACE OF A STONE BUILDING USED AS AN INFORMATION
 HV1845'OFFICE BY THE NATIONAL PARK SERVICE, 11.3 M (37.1 FT) SOUTHWEST OF
 HV1845'THE CENTER OF A CIRCLE DRIVEWAY, 4.6 M (15.1 FT) SOUTH OF A 3-FORKED
 HV1845'CATALPA TREE, 0.3 M (1.0 FT) SOUTHEAST OF THE SOUTHEAST EDGE OF A
 HV1845'SIDEWALK, AND THE MONUMENT IS FLUSH WITH THE GROUND SURFACE.
 HV1845
 HV1845                          STATION RECOVERY (1998)
 HV1845
 HV1845'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1998 (RLA)
 HV1845'RECOVERED AS DESCRIBED.
 HV1845
 HV1845                          STATION RECOVERY (1999)
 HV1845
 HV1845'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1999 (RWA)
 HV1845'RECOVERED AS DESCRIBED.
 HV1845
 HV1845                          STATION RECOVERY (2004)
 HV1845
 HV1845'RECOVERY NOTE BY FEDERAL HIGHWAY ADMINISTRATION 2004 (JDW)
 HV1845'RECOVERED IN GOOD CONDITION.
 HV1845
 HV1845                          STATION RECOVERY (2007)
 HV1845
 HV1845'RECOVERY NOTE BY US ARMY CORPS OF ENGINEERS 2007 (JBC)
 HV1845'RECOVERED IN GOOD CONDITION.
 HV1845
 HV1845                          STATION RECOVERY (2008)
 HV1845
 HV1845'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV1845'RECOVERED AS DESCRIBED.
 HV1845
 HV1845                          STATION RECOVERY (2009)
 HV1845
 HV1845'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV1845'RECOVERED IN GOOD CONDITION.
 HV1845
 HV1845                          STATION RECOVERY (2010)
 HV1845
 HV1845'RECOVERY NOTE BY US ARMY CORPS OF ENGINEERS 2010 (JCR)
 HV1845'RECOVERED IN GOOD CONDITION.  MARK IS APPROXIMATELY 15.05' AND 15.29
 HV1845'ABOVE THE ORIGINAL CONSTRUCTION/HYDRAULIC DATUM FOR THE POTOMAC PARK
 HV1845'SYSTEM AND ANACOSTIA SYSTEM, RESPECTIVELY, OF THE WASHINGTON, DC AND
 HV1845'VICINITY LEVEE PROJECT.
 HV1845
 HV1845                          STATION RECOVERY (2010)
 HV1845
 HV1845'RECOVERY NOTE BY GEOCACHING 2010 (GAH)
 HV1845'EXCELLENT.
 HV1845'SATELLITE VIEWS COMPROMISED BY TREES AND ONE NEARBY STRUCTURE.
 HV1845
 HV1845                          STATION RECOVERY (2012)
 HV1845
 HV1845'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1845'RECOVERED AS DESCRIBED.
 HV1845
 HV1845                          STATION RECOVERY (2018)
 HV1845
 HV1845'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV1845'RECOVERED IN GOOD CONDITION.
 HV1845
 HV1845                          STATION RECOVERY (2020)
 HV1845
 HV1845'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JKH)
 HV1845'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2033 ***********************************************************************
 HV2033  DESIGNATION -  M 2
 HV2033  PID         -  HV2033
 HV2033  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2033  COUNTRY     -  US
 HV2033  USGS QUAD   -  ALEXANDRIA (2019)
 HV2033
 HV2033                         *CURRENT SURVEY CONTROL
 HV2033  ______________________________________________________________________
 HV2033* NAD 83(1986) POSITION- 38 51 29.     (N) 077 00 48.     (W)   SCALED
 HV2033* NAVD 88 ORTHO HEIGHT -     3.066 (meters)       10.06  (feet) ADJUSTED
 HV2033  ______________________________________________________________________
 HV2033  GEOID HEIGHT    -        -32.179 (meters)                     GEOID18
 HV2033  DYNAMIC HEIGHT  -          3.065 (meters)       10.06  (feet) COMP
 HV2033  MODELED GRAVITY -    980,094.1   (mgal)                       NAVD 88
 HV2033
 HV2033  VERT ORDER      -  FIRST     CLASS II
 HV2033
 HV2033.The horizontal coordinates were scaled from a map and have
 HV2033.an estimated accuracy of +/- 6 seconds.
 HV2033
 HV2033.The orthometric height was determined by differential leveling and
 HV2033.adjusted by the NATIONAL GEODETIC SURVEY
 HV2033.in June 1991.
 HV2033
 HV2033.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2033.GEOID18 height accuracy estimate available here.
 HV2033
 HV2033.Click photographs - Photos may exist for this station.
 HV2033
 HV2033.The dynamic height is computed by dividing the NAVD 88
 HV2033.geopotential number by the normal gravity value computed on the
 HV2033.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2033.degrees latitude (g = 980.6199 gals.).
 HV2033
 HV2033.The modeled gravity was interpolated from observed gravity values.
 HV2033
 HV2033
 HV2033_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ253029(NAD 83)
 HV2033
 HV2033                          SUPERSEDED SURVEY CONTROL
 HV2033
 HV2033  NGVD 29 (11/26/84)    3.326  (m)           10.91   (f) ADJUSTED    1 2
 HV2033
 HV2033.Superseded values are not recommended for survey control.
 HV2033
 HV2033.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2033.See file dsdata.pdf to determine how the superseded data were derived.
 HV2033
 HV2033_MARKER: DB = BENCH MARK DISK
 HV2033_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2033_SP_SET: STEP LANDING
 HV2033_STAMPING: M 2 1944
 HV2033_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2033
 HV2033  HISTORY     - Date     Condition        Report By
 HV2033  HISTORY     - 1944     MONUMENTED       CGS
 HV2033  HISTORY     - 1956     GOOD             CGS
 HV2033
 HV2033                          STATION DESCRIPTION
 HV2033
 HV2033'DESCRIBED BY COAST AND GEODETIC SURVEY 1944
 HV2033'IN WASHINGTON.
 HV2033'IN SOUTHEAST WASHINGTON, AT THE NAVAL AIR STATION, AT THE
 HV2033'CONTROL TOWER (BUILDING 92), AT THE ENTRANCE IN THE SOUTHEAST
 HV2033'SIDE OF THE BUILDING, AT THE NORTHEAST DOOR, ON THE STEP LANDING,
 HV2033'15 INCHES SOUTHWEST OF THE NORTHEAST EDGE OF THE LANDING, AND
 HV2033'8 INCHES SOUTHEAST OF THE SOUTHEAST WALL.  A STANDARD DISK,
 HV2033'STAMPED M 2 1944.
 HV2033
 HV2033                          STATION RECOVERY (1956)
 HV2033
 HV2033'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956
 HV2033'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8021 ***********************************************************************
 HV8021  DESIGNATION -  M 2
 HV8021  PID         -  HV8021
 HV8021  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8021  COUNTRY     -  US
 HV8021  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8021
 HV8021                         *CURRENT SURVEY CONTROL
 HV8021  ______________________________________________________________________
 HV8021* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8021* NAVD 88 ORTHO HEIGHT -    17.198 (meters)       56.42  (feet) ADJUSTED
 HV8021  ______________________________________________________________________
 HV8021  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8021  DYNAMIC HEIGHT  -         17.189 (meters)       56.39  (feet) COMP
 HV8021  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8021
 HV8021  VERT ORDER      -  FIRST     CLASS 0
 HV8021
 HV8021.The horizontal coordinates were scaled from a map and have
 HV8021.an estimated accuracy of +/- 6 seconds.
 HV8021
 HV8021.The orthometric height was determined by differential leveling and
 HV8021.adjusted by the NATIONAL GEODETIC SURVEY
 HV8021.in June 1991.
 HV8021
 HV8021.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8021.GEOID18 height accuracy estimate available here.
 HV8021
 HV8021.Click photographs - Photos may exist for this station.
 HV8021
 HV8021.The dynamic height is computed by dividing the NAVD 88
 HV8021.geopotential number by the normal gravity value computed on the
 HV8021.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8021.degrees latitude (g = 980.6199 gals.).
 HV8021
 HV8021.The modeled gravity was interpolated from observed gravity values.
 HV8021
 HV8021
 HV8021_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8021
 HV8021                          SUPERSEDED SURVEY CONTROL
 HV8021
 HV8021  NGVD 29 (08/12/92)   17.431  (m)           57.19   (f) ADJUSTED    1 0
 HV8021
 HV8021.Superseded values are not recommended for survey control.
 HV8021
 HV8021.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8021.See file dsdata.pdf to determine how the superseded data were derived.
 HV8021
 HV8021_MARKER: Z = SEE DESCRIPTION
 HV8021_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8021_SP_SET: BUILDING
 HV8021_MARK LOGO: NONE
 HV8021_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8021_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8021
 HV8021  HISTORY     - Date     Condition        Report By
 HV8021  HISTORY     - 1949     MONUMENTED       CGS
 HV8021  HISTORY     - 1978     GOOD             NGS
 HV8021  HISTORY     - 1978     GOOD             NGS
 HV8021  HISTORY     - 1982     GOOD             NGS
 HV8021  HISTORY     - 19920615 GOOD             NGS
 HV8021
 HV8021                          STATION DESCRIPTION
 HV8021
 HV8021'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8021'IN WASHINGTON DC.
 HV8021'THE MARK IS 3.4 FT ABOVE GROUND.
 HV8021'AT THE WHITE HOUSE, IN THE SOUTH PORTICO, 2.4 FEET WEST FROM MOST
 HV8021'EASTERLY GATE OF PORTICO, 6.9 FEET EAST FROM
 HV8021'THE LADIES RESTROOM DOOR IN SOUTH PORTICO.  WHITE HOUSE WALL MARK.
 HV8021
 HV8021                          STATION RECOVERY (1978)
 HV8021
 HV8021'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8021'THE MARK IS 3.4 FT ABOVE GROUND.
 HV8021'AT THE WHITE HOUSE, IN THE SOUTH PORTICO, 2.4 FEET WEST FROM MOST
 HV8021'EASTERLY GATE OF PORTICO, 6.9 FEET EAST FROM
 HV8021'THE LADIES RESTROOM DOOR IN SOUTH PORTICO.  WHITE HOUSE WALL MARK.
 HV8021
 HV8021                          STATION RECOVERY (1982)
 HV8021
 HV8021'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8021'RECOVERED IN GOOD CONDITION.
 HV8021
 HV8021                          STATION RECOVERY (1992)
 HV8021
 HV8021'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8021'IN WASHINGTON, D.C., AT THE WHITE HOUSE, IN THE SOUTH PORTICO, 2.4
 HV8021'FEET (0.7 M) WEST FROM MOST EASTERLY GATE OF PORTICO, 6.9 FEET
 HV8021'(2.1 M) EAST FROM THE LADIES REST ROOM DOOR IN SOUTH PORTICO.  WHITE
 HV8021'HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1854 ***********************************************************************
 HV1854  DESIGNATION -  M 2 PBPP
 HV1854  PID         -  HV1854
 HV1854  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1854  COUNTRY     -  US
 HV1854  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1854
 HV1854                         *CURRENT SURVEY CONTROL
 HV1854  ______________________________________________________________________
 HV1854* NAD 83(1986) POSITION- 38 53 34.     (N) 077 02 46.     (W)   SCALED
 HV1854* NAVD 88 ORTHO HEIGHT -     6.617 (meters)       21.71  (feet) ADJUSTED
 HV1854  ______________________________________________________________________
 HV1854  GEOID HEIGHT    -        -32.068 (meters)                     GEOID18
 HV1854  DYNAMIC HEIGHT  -          6.613 (meters)       21.70  (feet) COMP
 HV1854  MODELED GRAVITY -    980,096.2   (mgal)                       NAVD 88
 HV1854
 HV1854  VERT ORDER      -  FIRST     CLASS II
 HV1854
 HV1854.The horizontal coordinates were scaled from a map and have
 HV1854.an estimated accuracy of +/- 6 seconds.
 HV1854
 HV1854.The orthometric height was determined by differential leveling and
 HV1854.adjusted by the NATIONAL GEODETIC SURVEY
 HV1854.in June 1991.
 HV1854
 HV1854.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1854.GEOID18 height accuracy estimate available here.
 HV1854
 HV1854.Click photographs - Photos may exist for this station.
 HV1854
 HV1854.The dynamic height is computed by dividing the NAVD 88
 HV1854.geopotential number by the normal gravity value computed on the
 HV1854.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1854.degrees latitude (g = 980.6199 gals.).
 HV1854
 HV1854.The modeled gravity was interpolated from observed gravity values.
 HV1854
 HV1854
 HV1854_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ225068(NAD 83)
 HV1854
 HV1854                          SUPERSEDED SURVEY CONTROL
 HV1854
 HV1854  NGVD 29 (11/26/84)    6.854  (m)           22.49   (f) ADJUSTED    1 2
 HV1854
 HV1854.Superseded values are not recommended for survey control.
 HV1854
 HV1854.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1854.See file dsdata.pdf to determine how the superseded data were derived.
 HV1854
 HV1854_MARKER: DD = SURVEY DISK
 HV1854_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1854_SP_SET: PILASTER
 HV1854_STAMPING: M 2
 HV1854_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1854
 HV1854  HISTORY     - Date     Condition        Report By
 HV1854  HISTORY     - UNK      MONUMENTED       PBPP
 HV1854  HISTORY     - 1926     GOOD             CGS
 HV1854  HISTORY     - 1956     GOOD             CGS
 HV1854
 HV1854                          STATION DESCRIPTION
 HV1854
 HV1854'DESCRIBED BY COAST AND GEODETIC SURVEY 1926
 HV1854'AT WASHINGTON.
 HV1854'AT WASHINGTON, ON CONSTITUTION AVENUE, AT THE INTERSECTION OF
 HV1854'TWENTIETH STREET NORTHWEST, AT THE MUNITIONS BUILDING, AT THE
 HV1854'WEST SIDE OF THE CENTER ENTRANCE, AT THE WEST END OF THE ROW OF
 HV1854'DOORS, IN THE NORTH FACE OF THE CONCRETE PILASTER, AND ABOUT
 HV1854'2-1/2 FEET ABOVE THE BASE OF THE PILASTER.  A PUBLIC BUILDINGS
 HV1854'AND PUBLIC PARKS STANDARD DISK, STAMPED M 2 AND SET VERTICALLY.
 HV1854
 HV1854                          STATION RECOVERY (1956)
 HV1854
 HV1854'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956
 HV1854'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8020 ***********************************************************************
 HV8020  DESIGNATION -  M 3
 HV8020  PID         -  HV8020
 HV8020  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8020  COUNTRY     -  US
 HV8020  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8020
 HV8020                         *CURRENT SURVEY CONTROL
 HV8020  ______________________________________________________________________
 HV8020* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8020* NAVD 88 ORTHO HEIGHT -    17.202 (meters)       56.44  (feet) ADJUSTED
 HV8020  ______________________________________________________________________
 HV8020  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8020  DYNAMIC HEIGHT  -         17.193 (meters)       56.41  (feet) COMP
 HV8020  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8020
 HV8020  VERT ORDER      -  FIRST     CLASS 0
 HV8020
 HV8020.The horizontal coordinates were scaled from a map and have
 HV8020.an estimated accuracy of +/- 6 seconds.
 HV8020
 HV8020.The orthometric height was determined by differential leveling and
 HV8020.adjusted by the NATIONAL GEODETIC SURVEY
 HV8020.in June 1991.
 HV8020
 HV8020.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8020.GEOID18 height accuracy estimate available here.
 HV8020
 HV8020.Click photographs - Photos may exist for this station.
 HV8020
 HV8020.The dynamic height is computed by dividing the NAVD 88
 HV8020.geopotential number by the normal gravity value computed on the
 HV8020.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8020.degrees latitude (g = 980.6199 gals.).
 HV8020
 HV8020.The modeled gravity was interpolated from observed gravity values.
 HV8020
 HV8020
 HV8020_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8020
 HV8020                          SUPERSEDED SURVEY CONTROL
 HV8020
 HV8020  NGVD 29 (08/12/92)   17.434  (m)           57.20   (f) ADJUSTED    1 0
 HV8020
 HV8020.Superseded values are not recommended for survey control.
 HV8020
 HV8020.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8020.See file dsdata.pdf to determine how the superseded data were derived.
 HV8020
 HV8020_MARKER: Z = SEE DESCRIPTION
 HV8020_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8020_SP_SET: BUILDING
 HV8020_MARK LOGO: NONE
 HV8020_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8020_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8020
 HV8020  HISTORY     - Date     Condition        Report By
 HV8020  HISTORY     - 1949     MONUMENTED       CGS
 HV8020  HISTORY     - 1978     GOOD             NGS
 HV8020  HISTORY     - 1978     GOOD             NGS
 HV8020  HISTORY     - 1982     GOOD             NGS
 HV8020  HISTORY     - 19920615 GOOD             NGS
 HV8020
 HV8020                          STATION DESCRIPTION
 HV8020
 HV8020'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8020'IN WASHINGTON DC.
 HV8020'THE MARK IS 3.3 FT ABOVE GROUND.
 HV8020'AT THE WHITE HOUSE, ON THE SOUTH PORTICO WALL, 6.7 FEET WEST FROM THE
 HV8020'LADIES RESTROOM DOOR IN EASTERN HALF OF SOUTH PORTICO,
 HV8020'6 FEET WEST FROM THE SOUTH ENTRANCE DOOR IN SOUTH
 HV8020'PORTICO.  WHITE HOUSE WALL MARK.
 HV8020
 HV8020                          STATION RECOVERY (1978)
 HV8020
 HV8020'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8020'THE MARK IS 3.3 FT ABOVE GROUND.
 HV8020'AT THE WHITE HOUSE, ON THE SOUTH PORTICO WALL, 6.7 FEET WEST FROM THE
 HV8020'LADIES RESTROOM DOOR IN EASTERN HALF OF SOUTH PORTICO,
 HV8020'6 FEET WEST FROM THE SOUTH ENTRANCE DOOR IN SOUTH
 HV8020'PORTICO.  WHITE HOUSE WALL MARK.
 HV8020
 HV8020                          STATION RECOVERY (1982)
 HV8020
 HV8020'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8020'RECOVERED IN GOOD CONDITION.
 HV8020
 HV8020                          STATION RECOVERY (1992)
 HV8020
 HV8020'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8020'IN WASHINGTON, D.C., AT THE WHITE HOUSE, ON THE SOUTH PORTICO WALL,
 HV8020'6.7 FEET (2.0 M) WEST FROM THE LADIES REST ROOM DOOR IN EASTERN HALF
 HV8020'OF SOUTH PORTICO, 6 FEET (1.8 M) WEST FROM THE SOUTH ENTRANCE DOOR IN
 HV8020'SOUTH PORTICO.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1853 ***********************************************************************
 HV1853  DESIGNATION -  M 3 PBPP
 HV1853  PID         -  HV1853
 HV1853  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1853  COUNTRY     -  US
 HV1853  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1853
 HV1853                         *CURRENT SURVEY CONTROL
 HV1853  ______________________________________________________________________
 HV1853* NAD 83(1986) POSITION- 38 53 33.     (N) 077 02 34.     (W)   SCALED
 HV1853* NAVD 88 ORTHO HEIGHT -     6.073 (meters)       19.92  (feet) ADJUSTED
 HV1853  ______________________________________________________________________
 HV1853  GEOID HEIGHT    -        -32.073 (meters)                     GEOID18
 HV1853  DYNAMIC HEIGHT  -          6.069 (meters)       19.91  (feet) COMP
 HV1853  MODELED GRAVITY -    980,096.7   (mgal)                       NAVD 88
 HV1853
 HV1853  VERT ORDER      -  FIRST     CLASS II
 HV1853
 HV1853.The horizontal coordinates were scaled from a map and have
 HV1853.an estimated accuracy of +/- 6 seconds.
 HV1853
 HV1853.The orthometric height was determined by differential leveling and
 HV1853.adjusted by the NATIONAL GEODETIC SURVEY
 HV1853.in June 1991.
 HV1853
 HV1853.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1853.GEOID18 height accuracy estimate available here.
 HV1853
 HV1853.Click photographs - Photos may exist for this station.
 HV1853
 HV1853.The dynamic height is computed by dividing the NAVD 88
 HV1853.geopotential number by the normal gravity value computed on the
 HV1853.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1853.degrees latitude (g = 980.6199 gals.).
 HV1853
 HV1853.The modeled gravity was interpolated from observed gravity values.
 HV1853
 HV1853
 HV1853_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ228068(NAD 83)
 HV1853
 HV1853                          SUPERSEDED SURVEY CONTROL
 HV1853
 HV1853  NGVD 29 (11/26/84)    6.310  (m)           20.70   (f) ADJUSTED    1 2
 HV1853
 HV1853.Superseded values are not recommended for survey control.
 HV1853
 HV1853.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1853.See file dsdata.pdf to determine how the superseded data were derived.
 HV1853
 HV1853_MARKER: DD = SURVEY DISK
 HV1853_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1853_SP_SET: PILASTER
 HV1853_STAMPING: M 3
 HV1853_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1853
 HV1853  HISTORY     - Date     Condition        Report By
 HV1853  HISTORY     - UNK      MONUMENTED       PBPP
 HV1853  HISTORY     - 1926     GOOD             CGS
 HV1853  HISTORY     - 1956     GOOD             CGS
 HV1853
 HV1853                          STATION DESCRIPTION
 HV1853
 HV1853'DESCRIBED BY COAST AND GEODETIC SURVEY 1926
 HV1853'AT WASHINGTON.
 HV1853'AT WASHINGTON, ON CONSTITUTION AVENUE, AT THE INTERSECTION OF
 HV1853'THE EIGHTEENTH STREET NORTHWEST, AT THE NAVY BUILDING, AT THE
 HV1853'EAST SIDE OF THE CENTER ENTRANCE, IN LINE WITH THE CENTERLINE OF
 HV1853'THE WEST SIDEWALK OF EIGHTEENTH STREET, AT THE EAST END OF THE
 HV1853'ROW OF DOORS, IN THE NORTH FACE OF THE CONCRETE PILASTER, AND
 HV1853'ABOUT 3 FEET ABOVE THE BASE OF THE PILASTER.  A PUBLIC BUILDINGS
 HV1853'AND PUBLIC PARKS STANDARD DISK, STAMPED M 3 AND SET VERTICALLY.
 HV1853
 HV1853                          STATION RECOVERY (1956)
 HV1853
 HV1853'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956
 HV1853'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8019 ***********************************************************************
 HV8019  DESIGNATION -  M 4
 HV8019  PID         -  HV8019
 HV8019  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8019  COUNTRY     -  US
 HV8019  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8019
 HV8019                         *CURRENT SURVEY CONTROL
 HV8019  ______________________________________________________________________
 HV8019* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8019* NAVD 88 ORTHO HEIGHT -    17.203 (meters)       56.44  (feet) ADJUSTED
 HV8019  ______________________________________________________________________
 HV8019  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8019  DYNAMIC HEIGHT  -         17.194 (meters)       56.41  (feet) COMP
 HV8019  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8019
 HV8019  VERT ORDER      -  FIRST     CLASS 0
 HV8019
 HV8019.The horizontal coordinates were scaled from a map and have
 HV8019.an estimated accuracy of +/- 6 seconds.
 HV8019
 HV8019.The orthometric height was determined by differential leveling and
 HV8019.adjusted by the NATIONAL GEODETIC SURVEY
 HV8019.in June 1991.
 HV8019
 HV8019.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8019.GEOID18 height accuracy estimate available here.
 HV8019
 HV8019.Click photographs - Photos may exist for this station.
 HV8019
 HV8019.The dynamic height is computed by dividing the NAVD 88
 HV8019.geopotential number by the normal gravity value computed on the
 HV8019.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8019.degrees latitude (g = 980.6199 gals.).
 HV8019
 HV8019.The modeled gravity was interpolated from observed gravity values.
 HV8019
 HV8019
 HV8019_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8019
 HV8019                          SUPERSEDED SURVEY CONTROL
 HV8019
 HV8019  NGVD 29 (08/12/92)   17.436  (m)           57.20   (f) ADJUSTED    1 0
 HV8019
 HV8019.Superseded values are not recommended for survey control.
 HV8019
 HV8019.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8019.See file dsdata.pdf to determine how the superseded data were derived.
 HV8019
 HV8019_MARKER: Z = SEE DESCRIPTION
 HV8019_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8019_SP_SET: BUILDING
 HV8019_MARK LOGO: NONE
 HV8019_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8019_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8019
 HV8019  HISTORY     - Date     Condition        Report By
 HV8019  HISTORY     - 1949     MONUMENTED       CGS
 HV8019  HISTORY     - 1978     GOOD             NGS
 HV8019  HISTORY     - 1978     GOOD             NGS
 HV8019  HISTORY     - 1982     GOOD             NGS
 HV8019  HISTORY     - 19920615 GOOD             NGS
 HV8019
 HV8019                          STATION DESCRIPTION
 HV8019
 HV8019'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8019'IN WASHINGTON DC.
 HV8019'AT THE WHITE HOUSE, IN THE SOUTH PORTICO, 6 FEET EAST FROM THE SOUTH
 HV8019'ENTRANCE DOOR, 6 FEET BELOW BASE OF WALL LAMP
 HV8019'JUST EAST OF SOUTH ENTRANCE.  WHITE HOUSE WALL MARK.
 HV8019
 HV8019                          STATION RECOVERY (1978)
 HV8019
 HV8019'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8019'AT THE WHITE HOUSE, IN THE SOUTH PORTICO, 6 FEET EAST FROM THE SOUTH
 HV8019'ENTRANCE DOOR, 6 FEET BELOW BASE OF WALL LAMP
 HV8019'JUST EAST OF SOUTH ENTRANCE.  WHITE HOUSE WALL MARK.
 HV8019
 HV8019                          STATION RECOVERY (1982)
 HV8019
 HV8019'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8019'RECOVERED IN GOOD CONDITION.
 HV8019
 HV8019                          STATION RECOVERY (1992)
 HV8019
 HV8019'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8019'IN WASHINGTON, D.C., AT THE WHITE HOUSE, IN THE SOUTH PORTICO, 6 FEET
 HV8019'(1.8 M) EAST FROM THE SOUTH ENTRANCE DOOR, 6 FEET (1.8 M) BELOW BASE
 HV8019'OF WALL LAMP JUST EAST OF SOUTH ENTRANCE.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1458 ***********************************************************************
 HV1458  DESIGNATION -  M 4 DCDHT
 HV1458  PID         -  HV1458
 HV1458  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1458  COUNTRY     -  US
 HV1458  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1458
 HV1458                         *CURRENT SURVEY CONTROL
 HV1458  ______________________________________________________________________
 HV1458* NAD 83(1986) POSITION- 38 53 44.     (N) 076 57 08.     (W)   SCALED
 HV1458* NAVD 88 ORTHO HEIGHT -    13.566 (meters)       44.51  (feet) ADJUSTED
 HV1458  ______________________________________________________________________
 HV1458  GEOID HEIGHT    -        -32.228 (meters)                     GEOID18
 HV1458  DYNAMIC HEIGHT  -         13.559 (meters)       44.48  (feet) COMP
 HV1458  MODELED GRAVITY -    980,093.0   (mgal)                       NAVD 88
 HV1458
 HV1458  VERT ORDER      -  SECOND    CLASS 0
 HV1458
 HV1458.The horizontal coordinates were scaled from a map and have
 HV1458.an estimated accuracy of +/- 6 seconds.
 HV1458
 HV1458.The orthometric height was determined by differential leveling and
 HV1458.adjusted by the NATIONAL GEODETIC SURVEY
 HV1458.in June 1991.
 HV1458
 HV1458.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1458.GEOID18 height accuracy estimate available here.
 HV1458
 HV1458.Click photographs - Photos may exist for this station.
 HV1458
 HV1458.The dynamic height is computed by dividing the NAVD 88
 HV1458.geopotential number by the normal gravity value computed on the
 HV1458.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1458.degrees latitude (g = 980.6199 gals.).
 HV1458
 HV1458.The modeled gravity was interpolated from observed gravity values.
 HV1458
 HV1458
 HV1458_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ306069(NAD 83)
 HV1458
 HV1458                          SUPERSEDED SURVEY CONTROL
 HV1458
 HV1458  NGVD 29 (11/26/84)   13.799  (m)           45.27   (f) ADJUSTED    2 0
 HV1458
 HV1458.Superseded values are not recommended for survey control.
 HV1458
 HV1458.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1458.See file dsdata.pdf to determine how the superseded data were derived.
 HV1458
 HV1458_MARKER: DD = SURVEY DISK
 HV1458_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1458_SP_SET: ABUTMENT
 HV1458_STAMPING: M 4 1961
 HV1458_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1458
 HV1458  HISTORY     - Date     Condition        Report By
 HV1458  HISTORY     - 1961     MONUMENTED       DCDHT
 HV1458  HISTORY     - 1961     GOOD             CGS
 HV1458
 HV1458                          STATION DESCRIPTION
 HV1458
 HV1458'DESCRIBED BY COAST AND GEODETIC SURVEY 1961
 HV1458'AT WASHINGTON DC.
 HV1458'IN NE WASHINGTON, AT THE KENILWORTH AVE., BENNING RD. INTERCHANGE,
 HV1458'NE OF BENNING ROAD AT A BRIDGE OVER THE SW BOUND TRAFFIC LANE OF
 HV1458'KENILWORTH AVE.  (THIS BRIDGE IS PART OF THE RAMP CARRYING THE
 HV1458'NE BOUND TRAFFIC ON KENILWORTH AVE. TO THE NW BOUND TRAFFIC ON
 HV1458'BENNING ROAD), AT THE W CORNER, IN THE ABUTMENT, 6 FEET FROM THE
 HV1458'CURB AND 4 FEET N OF A GUARDRAIL POST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1852 ***********************************************************************
 HV1852  DESIGNATION -  M 4 PBPP
 HV1852  PID         -  HV1852
 HV1852  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1852  COUNTRY     -  US
 HV1852  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1852
 HV1852                         *CURRENT SURVEY CONTROL
 HV1852  ______________________________________________________________________
 HV1852* NAD 83(1986) POSITION- 38 53 33.     (N) 077 02 33.     (W)   SCALED
 HV1852* NAVD 88 ORTHO HEIGHT -     5.006 (meters)       16.42  (feet) ADJUSTED
 HV1852  ______________________________________________________________________
 HV1852  GEOID HEIGHT    -        -32.073 (meters)                     GEOID18
 HV1852  DYNAMIC HEIGHT  -          5.003 (meters)       16.41  (feet) COMP
 HV1852  MODELED GRAVITY -    980,096.7   (mgal)                       NAVD 88
 HV1852
 HV1852  VERT ORDER      -  FIRST     CLASS II
 HV1852
 HV1852.The horizontal coordinates were scaled from a map and have
 HV1852.an estimated accuracy of +/- 6 seconds.
 HV1852
 HV1852.The orthometric height was determined by differential leveling and
 HV1852.adjusted by the NATIONAL GEODETIC SURVEY
 HV1852.in June 1991.
 HV1852
 HV1852.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1852.GEOID18 height accuracy estimate available here.
 HV1852
 HV1852.Click photographs - Photos may exist for this station.
 HV1852
 HV1852.The dynamic height is computed by dividing the NAVD 88
 HV1852.geopotential number by the normal gravity value computed on the
 HV1852.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1852.degrees latitude (g = 980.6199 gals.).
 HV1852
 HV1852.The modeled gravity was interpolated from observed gravity values.
 HV1852
 HV1852
 HV1852_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ228068(NAD 83)
 HV1852
 HV1852                          SUPERSEDED SURVEY CONTROL
 HV1852
 HV1852  NGVD 29 (11/26/84)    5.243  (m)           17.20   (f) ADJUSTED    1 2
 HV1852
 HV1852.Superseded values are not recommended for survey control.
 HV1852
 HV1852.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1852.See file dsdata.pdf to determine how the superseded data were derived.
 HV1852
 HV1852_MARKER: DD = SURVEY DISK
 HV1852_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1852_SP_SET: WALL
 HV1852_STAMPING: M 4
 HV1852_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1852
 HV1852  HISTORY     - Date     Condition        Report By
 HV1852  HISTORY     - UNK      MONUMENTED       PBPP
 HV1852  HISTORY     - 1926     GOOD             CGS
 HV1852  HISTORY     - 1956     GOOD             CGS
 HV1852
 HV1852                          STATION DESCRIPTION
 HV1852
 HV1852'DESCRIBED BY COAST AND GEODETIC SURVEY 1926
 HV1852'AT WASHINGTON.
 HV1852'AT WASHINGTON, ON CONSTITUTION AVENUE, AT THE JUNCTION OF
 HV1852'VIRGINIA AVENUE NORTHWEST, AT THE EAST ENTRANCE TO THE NAVY
 HV1852'BUILDING, AT THE EAST END OF THE STEPS, IN THE NORTH FACE OF THE
 HV1852'LOW CONCRETE WALL, AND ABOUT 1 FOOT ABOVE THE SIDEWALK.  A PUBLIC
 HV1852'BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED M 4 AND SET
 HV1852'VERTICALLY.
 HV1852
 HV1852                          STATION RECOVERY (1956)
 HV1852
 HV1852'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956
 HV1852'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8018 ***********************************************************************
 HV8018  DESIGNATION -  M 5
 HV8018  PID         -  HV8018
 HV8018  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8018  COUNTRY     -  US
 HV8018  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8018
 HV8018                         *CURRENT SURVEY CONTROL
 HV8018  ______________________________________________________________________
 HV8018* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8018* NAVD 88 ORTHO HEIGHT -    17.210 (meters)       56.46  (feet) ADJUSTED
 HV8018  ______________________________________________________________________
 HV8018  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8018  DYNAMIC HEIGHT  -         17.201 (meters)       56.43  (feet) COMP
 HV8018  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8018
 HV8018  VERT ORDER      -  FIRST     CLASS 0
 HV8018
 HV8018.The horizontal coordinates were scaled from a map and have
 HV8018.an estimated accuracy of +/- 6 seconds.
 HV8018
 HV8018.The orthometric height was determined by differential leveling and
 HV8018.adjusted by the NATIONAL GEODETIC SURVEY
 HV8018.in June 1991.
 HV8018
 HV8018.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8018.GEOID18 height accuracy estimate available here.
 HV8018
 HV8018.Click photographs - Photos may exist for this station.
 HV8018
 HV8018.The dynamic height is computed by dividing the NAVD 88
 HV8018.geopotential number by the normal gravity value computed on the
 HV8018.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8018.degrees latitude (g = 980.6199 gals.).
 HV8018
 HV8018.The modeled gravity was interpolated from observed gravity values.
 HV8018
 HV8018
 HV8018_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8018
 HV8018                          SUPERSEDED SURVEY CONTROL
 HV8018
 HV8018  NGVD 29 (08/12/92)   17.443  (m)           57.23   (f) ADJUSTED    1 0
 HV8018
 HV8018.Superseded values are not recommended for survey control.
 HV8018
 HV8018.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8018.See file dsdata.pdf to determine how the superseded data were derived.
 HV8018
 HV8018_MARKER: Z = SEE DESCRIPTION
 HV8018_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8018_SP_SET: BUILDING
 HV8018_MARK LOGO: NONE
 HV8018_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8018_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8018
 HV8018  HISTORY     - Date     Condition        Report By
 HV8018  HISTORY     - 1949     MONUMENTED       CGS
 HV8018  HISTORY     - 1978     GOOD             NGS
 HV8018  HISTORY     - 1978     GOOD             NGS
 HV8018  HISTORY     - 1982     GOOD             NGS
 HV8018  HISTORY     - 19920615 GOOD             NGS
 HV8018
 HV8018                          STATION DESCRIPTION
 HV8018
 HV8018'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8018'IN WASHINGTON DC.
 HV8018'THE MARK IS 3.3 FT ABOVE GROUND.
 HV8018'AT THE WHITE HOUSE, 6 FEET WEST FROM THE DOOR TO HELICOPTER ROOM,
 HV8018'2.9 FEET EAST FROM MOST WESTERLY GATE OF SOUTH
 HV8018'PORTICO.  WHITE HOUSE WALL MARK.
 HV8018
 HV8018                          STATION RECOVERY (1978)
 HV8018
 HV8018'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8018'THE MARK IS 3.3 FT ABOVE GROUND.
 HV8018'AT THE WHITE HOUSE, 6 FEET WEST FROM THE DOOR TO HELICOPTER ROOM,
 HV8018'2.9 FEET EAST FROM MOST WESTERLY GATE OF SOUTH
 HV8018'PORTICO.  WHITE HOUSE WALL MARK.
 HV8018
 HV8018                          STATION RECOVERY (1982)
 HV8018
 HV8018'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8018'RECOVERED IN GOOD CONDITION.  NEW DESCRIPTION FOLLOWS.  1.83 METERS
 HV8018'(6 FT) WEST FROM THE SOUTH ENTRANCE DOOR, 6 FT BELOW THE BASE OF A
 HV8018'WALL LAMP WHITE HOUSE WALL MARK, 3 FT ABOVE THE GROUND.
 HV8018
 HV8018                          STATION RECOVERY (1992)
 HV8018
 HV8018'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8018'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 1.83 M (6.00 FT) WEST FROM
 HV8018'THE SOUTH ENTRANCE DOOR, 6 FEET (1.8 M) BELOW THE BASE OF A WALL
 HV8018'LAMP, AND 3 FEET (0.9 M) ABOVE THE GROUND.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1858 ***********************************************************************
 HV1858  DESIGNATION -  M 5
 HV1858  PID         -  HV1858
 HV1858  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1858  COUNTRY     -  US
 HV1858  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1858
 HV1858                         *CURRENT SURVEY CONTROL
 HV1858  ______________________________________________________________________
 HV1858* NAD 83(1986) POSITION- 38 54 30.     (N) 077 03 16.     (W)   SCALED
 HV1858* NAVD 88 ORTHO HEIGHT -    10.003 (meters)       32.82  (feet) ADJUSTED
 HV1858  ______________________________________________________________________
 HV1858  GEOID HEIGHT    -        -32.029 (meters)                     GEOID18
 HV1858  DYNAMIC HEIGHT  -          9.998 (meters)       32.80  (feet) COMP
 HV1858  MODELED GRAVITY -    980,093.5   (mgal)                       NAVD 88
 HV1858
 HV1858  VERT ORDER      -  FIRST     CLASS I
 HV1858
 HV1858.The horizontal coordinates were scaled from a map and have
 HV1858.an estimated accuracy of +/- 6 seconds.
 HV1858
 HV1858.The orthometric height was determined by differential leveling and
 HV1858.adjusted by the NATIONAL GEODETIC SURVEY
 HV1858.in June 1991.
 HV1858
 HV1858.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1858.GEOID18 height accuracy estimate available here.
 HV1858
 HV1858.Click photographs - Photos may exist for this station.
 HV1858
 HV1858.The dynamic height is computed by dividing the NAVD 88
 HV1858.geopotential number by the normal gravity value computed on the
 HV1858.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1858.degrees latitude (g = 980.6199 gals.).
 HV1858
 HV1858.The modeled gravity was interpolated from observed gravity values.
 HV1858
 HV1858
 HV1858_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ218086(NAD 83)
 HV1858
 HV1858                          SUPERSEDED SURVEY CONTROL
 HV1858
 HV1858  NGVD 29 (11/26/84)   10.240  (m)           33.60   (f) ADJUSTED    1 1
 HV1858
 HV1858.Superseded values are not recommended for survey control.
 HV1858
 HV1858.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1858.See file dsdata.pdf to determine how the superseded data were derived.
 HV1858
 HV1858_MARKER: DB = BENCH MARK DISK
 HV1858_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1858_STAMPING: M 5 1971
 HV1858_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1858+STABILITY: SURFACE MOTION
 HV1858
 HV1858  HISTORY     - Date     Condition        Report By
 HV1858  HISTORY     - 1971     MONUMENTED       NGS
 HV1858  HISTORY     - 1974     GOOD             NGS
 HV1858
 HV1858                          STATION DESCRIPTION
 HV1858
 HV1858'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1858'AT WASHINGTON.
 HV1858'AT WASHINGTON, D.C., ABOUT 1.75 MILES NORTH ALONG ROCK CREEK
 HV1858'PARKWAY FROM THE LINCOLN MEMORIAL, ABOUT 0.2 MILE NORTHEAST OF
 HV1858'THE M STREET OVERPASS FOR THE PARKWAY, AT A 50-FOOT LONG 10-FOOT
 HV1858'HIGH ROCK BANK, 47 1/2 FEET NORTHWEST (SLOPE MEASUREMENT) FROM
 HV1858'THE CENTER LINE OF THE PARKWAY, 141.0 FEET EAST (SLOPE
 HV1858'MEASUREMENT) FROM A METAL CORNER POST IN A CHAIN LINK FENCE, 63.8
 HV1858'FEET SOUTHWEST OF LIGHT POLE NUMBER 72, 16.0 FEET NORTHWEST OF
 HV1858'THE SOUTHEAST EDGE OF THE ROCK BANK, AND SET IN THE TOP OF A
 HV1858'CONCRETE POST WHICH IS 3 FEET DEEP AND WHICH HAS BEEN IMBEDDED
 HV1858'IN BEDROCK.  THE DISK IS 2 INCHES ABOVE THE SURFACE OF THE
 HV1858'GROUND AND IS ABOUT 12 FEET ABOVE THE LEVEL OF THE PARKWAY.
 HV1858
 HV1858                          STATION RECOVERY (1974)
 HV1858
 HV1858'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974
 HV1858'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1849 ***********************************************************************
 HV1849  DESIGNATION -  M 5=PAUL JONES=TIDAL
 HV1849  PID         -  HV1849
 HV1849  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1849  COUNTRY     -  US
 HV1849  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1849
 HV1849                         *CURRENT SURVEY CONTROL
 HV1849  ______________________________________________________________________
 HV1849* NAD 83(1986) POSITION- 38 53 17.85   (N) 077 02 22.10   (W)   HD_HELD1
 HV1849* NAVD 88 ORTHO HEIGHT -     3.052 (meters)       10.01  (feet) ADJUSTED
 HV1849  ______________________________________________________________________
 HV1849  GEOID HEIGHT    -        -32.085 (meters)                     GEOID18
 HV1849  DYNAMIC HEIGHT  -          3.050 (meters)       10.01  (feet) COMP
 HV1849  MODELED GRAVITY -    980,097.1   (mgal)                       NAVD 88
 HV1849
 HV1849  VERT ORDER      -  FIRST     CLASS II
 HV1849
 HV1849.The horizontal coordinates were determined by differentially corrected
 HV1849.hand held GPS observations or other comparable positioning techniques
 HV1849.and have an estimated accuracy of +/- 3 meters.
 HV1849
 HV1849.The orthometric height was determined by differential leveling and
 HV1849.adjusted by the NATIONAL GEODETIC SURVEY
 HV1849.in October 2012.
 HV1849
 HV1849.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1849.GEOID18 height accuracy estimate available here.
 HV1849
 HV1849.Click photographs - Photos may exist for this station.
 HV1849
 HV1849.The dynamic height is computed by dividing the NAVD 88
 HV1849.geopotential number by the normal gravity value computed on the
 HV1849.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1849.degrees latitude (g = 980.6199 gals.).
 HV1849
 HV1849.The modeled gravity was interpolated from observed gravity values.
 HV1849
 HV1849
 HV1849_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2311306357(NAD 83)
 HV1849
 HV1849                          SUPERSEDED SURVEY CONTROL
 HV1849
 HV1849  NAVD 88 (06/15/91)    3.381  (m)           11.09   (f) SUPERSEDED  1 2
 HV1849  NGVD 29 (11/26/84)    3.617  (m)           11.87   (f) ADJUSTED    1 2
 HV1849
 HV1849.Superseded values are not recommended for survey control.
 HV1849
 HV1849.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1849.See file dsdata.pdf to determine how the superseded data were derived.
 HV1849
 HV1849_MARKER: X = CHISELED CROSS
 HV1849_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1849_SP_SET: MONUMENT PEDESTAL
 HV1849_MARK LOGO: NONE
 HV1849_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1849_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1849+SATELLITE: SATELLITE OBSERVATIONS - March 01, 2012
 HV1849
 HV1849  HISTORY     - Date     Condition        Report By
 HV1849  HISTORY     - UNK      MONUMENTED       PBPP
 HV1849  HISTORY     - 1926     GOOD             CGS
 HV1849  HISTORY     - 1956     GOOD             CGS
 HV1849  HISTORY     - 20040612 POOR             NGS
 HV1849  HISTORY     - 20120301 GOOD             NGS
 HV1849
 HV1849                          STATION DESCRIPTION
 HV1849
 HV1849'DESCRIBED BY COAST AND GEODETIC SURVEY 1926
 HV1849'AT WASHINGTON.
 HV1849'AT WASHINGTON, IN WEST POTOMAC PARK, AT THE FOOT OF SEVENTEENTH
 HV1849'STREET, AT THE JOHN PAUL JONES MONUMENT, ON THE NORTHEAST CORNER
 HV1849'OF THE PEDESTAL, AND ABOUT 3 FEET ABOVE THE GROUND.  A FAINT
 HV1849'CHISELED CROSS.
 HV1849
 HV1849                          STATION RECOVERY (1956)
 HV1849
 HV1849'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956
 HV1849'RECOVERED IN GOOD CONDITION.
 HV1849
 HV1849                          STATION RECOVERY (2004)
 HV1849
 HV1849'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2004 (DW)
 HV1849'THE J.P. JONES MONUMENT IS INTACT, HOWEVER, NO FAINT X COULD BE SEEN.
 HV1849
 HV1849                          STATION RECOVERY (2012)
 HV1849
 HV1849'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1849'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1843 ***********************************************************************
 HV1843  DESIGNATION -  M 9 PBPP
 HV1843  PID         -  HV1843
 HV1843  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1843  COUNTRY     -  US
 HV1843  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1843
 HV1843                         *CURRENT SURVEY CONTROL
 HV1843  ______________________________________________________________________
 HV1843* NAD 83(1986) POSITION- 38 53 10.     (N) 077 02 02.     (W)   SCALED
 HV1843* NAVD 88 ORTHO HEIGHT -     9.257 (meters)       30.37  (feet) ADJUSTED
 HV1843  ______________________________________________________________________
 HV1843  GEOID HEIGHT    -        -32.097 (meters)                     GEOID18
 HV1843  DYNAMIC HEIGHT  -          9.252 (meters)       30.35  (feet) COMP
 HV1843  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV1843
 HV1843  VERT ORDER      -  FIRST     CLASS II
 HV1843
 HV1843.The horizontal coordinates were scaled from a map and have
 HV1843.an estimated accuracy of +/- 6 seconds.
 HV1843
 HV1843.The orthometric height was determined by differential leveling and
 HV1843.adjusted by the NATIONAL GEODETIC SURVEY
 HV1843.in June 1991.
 HV1843
 HV1843.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1843.GEOID18 height accuracy estimate available here.
 HV1843
 HV1843.Click photographs - Photos may exist for this station.
 HV1843
 HV1843.The dynamic height is computed by dividing the NAVD 88
 HV1843.geopotential number by the normal gravity value computed on the
 HV1843.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1843.degrees latitude (g = 980.6199 gals.).
 HV1843
 HV1843.The modeled gravity was interpolated from observed gravity values.
 HV1843
 HV1843
 HV1843_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ235061(NAD 83)
 HV1843
 HV1843                          SUPERSEDED SURVEY CONTROL
 HV1843
 HV1843  NGVD 29 (11/26/84)    9.491  (m)           31.14   (f) ADJUSTED    1 2
 HV1843
 HV1843.Superseded values are not recommended for survey control.
 HV1843
 HV1843.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1843.See file dsdata.pdf to determine how the superseded data were derived.
 HV1843
 HV1843_MARKER: DD = SURVEY DISK
 HV1843_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1843_SP_SET: BUILDING
 HV1843_STAMPING: M 9
 HV1843_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1843
 HV1843  HISTORY     - Date     Condition        Report By
 HV1843  HISTORY     - UNK      MONUMENTED       PBPP
 HV1843  HISTORY     - 1926     GOOD             CGS
 HV1843  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV1843
 HV1843                          STATION DESCRIPTION
 HV1843
 HV1843'DESCRIBED BY COAST AND GEODETIC SURVEY 1926
 HV1843'AT WASHINGTON.
 HV1843'AT WASHINGTON, ON FIFTEENTH STREET, WEST ACROSS THE STREET
 HV1843'FROM THE NORTH END OF THE BUREAU OF ENGRAVING AND PRINTING, AT A
 HV1843'ONE-STORY BRICK BUILDING USED AS A STOCKROOM BY THE NATIONAL
 HV1843'CAPITOL PARKS, IN THE EAST WALL, 21 FEET NORTH OF THE SOUTHEAST
 HV1843'CORNER OF THE BUILDING, 3 FEET SOUTH OF THE SOUTH EDGE OF THE
 HV1843'SOUTH DOORWAY, 4 FEET WEST OF THE WEST CURB OF THE STREET, AND
 HV1843'ABOUT 2 FEET ABOVE THE GROUND.  A PUBLIC BUILDINGS AND PUBLIC
 HV1843'PARKS STANDARD DISK, STAMPED M 9 AND SET VERTICALLY.
 HV1843
 HV1843                          STATION RECOVERY (1971)
 HV1843
 HV1843'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971
 HV1843'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7730 ***********************************************************************
 HV7730  DESIGNATION -  M USE 1931
 HV7730  PID         -  HV7730
 HV7730  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7730  COUNTRY     -  US
 HV7730  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7730
 HV7730                         *CURRENT SURVEY CONTROL
 HV7730  ______________________________________________________________________
 HV7730* NAD 83(1993) POSITION- 38 53 18.83700(N) 076 57 42.19872(W)   ADJUSTED
 HV7730* NAVD 88 ORTHO HEIGHT -     8.7   (meters)       29.    (feet) VERTCON3
 HV7730  ______________________________________________________________________
 HV7730  GEOID HEIGHT    -        -32.220 (meters)                     GEOID18
 HV7730  LAPLACE CORR    -         -3.63  (seconds)                    DEFLEC18
 HV7730  HORZ ORDER      -  THIRD
 HV7730
 HV7730.The horizontal coordinates were established by classical geodetic methods
 HV7730.and adjusted by the National Geodetic Survey in November 1994.
 HV7730
 HV7730.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV7730.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV7730
 HV7730.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7730.GEOID18 height accuracy estimate available here.
 HV7730
 HV7730.Click photographs - Photos may exist for this station.
 HV7730
 HV7730.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7730
 HV7730. The following values were computed from the NAD 83(1993) position.
 HV7730
 HV7730;                    North         East     Units Scale Factor Converg.
 HV7730;SPC MD       -   135,636.715   403,320.925   MT  0.99994987   +0 01 26.5
 HV7730;SPC MD       -   445,001.46  1,323,228.73   sFT  0.99994987   +0 01 26.5
 HV7730;SPC VA N     - 2,136,748.975 3,633,452.625   MT  0.99995955   +0 57 36.2
 HV7730;SPC VA N     - 7,010,317.26 11,920,752.49   sFT  0.99995955   +0 57 36.2
 HV7730;UTM  18      - 4,306,239.751   329,857.822   MT  0.99995647   -1 13 54.8
 HV7730
 HV7730!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7730!SPC MD       -   1.00000370  x   0.99994987  =   0.99995357
 HV7730!SPC VA N     -   1.00000370  x   0.99995955  =   0.99996325
 HV7730!UTM  18      -   1.00000370  x   0.99995647  =   0.99996017
 HV7730
 HV7730:                Primary Azimuth Mark                     Grid Az
 HV7730:SPC MD       -  L USE 1931                               210 20 38.1
 HV7730:SPC VA N     -  L USE 1931                               209 24 28.4
 HV7730:UTM  18      -  L USE 1931                               211 35 59.4
 HV7730
 HV7730_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2985706239(NAD 83)
 HV7730
 HV7730|---------------------------------------------------------------------|
 HV7730| PID    Reference Object                     Distance      Geod. Az  |
 HV7730|                                                           dddmmss.s |
 HV7730| HV7733 L USE 1931                          APPROX. 0.9 KM 2102204.6 |
 HV7730|---------------------------------------------------------------------|
 HV7730
 HV7730                          SUPERSEDED SURVEY CONTROL
 HV7730
 HV7730  NAD 83(1991)-  38 53 18.83568(N)    076 57 42.19982(W) AD(       ) 3
 HV7730  NAD 83(1986)-  38 53 18.83488(N)    076 57 42.21097(W) AD(       ) 3
 HV7730  NAD 27      -  38 53 18.43000(N)    076 57 43.30700(W) AD(       ) 3
 HV7730  NGVD 29 (07/19/86)    8.9    (m)           29.     (f) VERT ANG       
 HV7730
 HV7730.Superseded values are not recommended for survey control.
 HV7730
 HV7730.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7730.See file dsdata.pdf to determine how the superseded data were derived.
 HV7730
 HV7730
 HV7730  HISTORY     - Date     Condition        Report By
 HV7730  HISTORY     - 1931     MONUMENTED       CGS
 HV7730  HISTORY     - 1958     MARK NOT FOUND   CGS
 HV7730
 HV7730                          STATION DESCRIPTION
 HV7730
 HV7730'DESCRIBED BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7730'DUE TO THE LACK OF A DESCRIPTION, THE STATION IS NOT RECOVERABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1954 ***********************************************************************
 HV1954  DESIGNATION -  MAIN BUILDING
 HV1954  PID         -  HV1954
 HV1954  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1954  COUNTRY     -  US
 HV1954  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1954
 HV1954                         *CURRENT SURVEY CONTROL
 HV1954  ______________________________________________________________________
 HV1954* NAD 83(1986) POSITION- 38 55 16.     (N) 077 04 01.     (W)   SCALED
 HV1954* NAVD 88 ORTHO HEIGHT -    81.723 (meters)      268.12  (feet) ADJUSTED
 HV1954  ______________________________________________________________________
 HV1954  GEOID HEIGHT    -        -31.989 (meters)                     GEOID18
 HV1954  DYNAMIC HEIGHT  -         81.679 (meters)      267.98  (feet) COMP
 HV1954  MODELED GRAVITY -    980,088.8   (mgal)                       NAVD 88
 HV1954
 HV1954  VERT ORDER      -  SECOND    CLASS 0
 HV1954
 HV1954.The horizontal coordinates were scaled from a map and have
 HV1954.an estimated accuracy of +/- 6 seconds.
 HV1954
 HV1954.The orthometric height was determined by differential leveling and
 HV1954.adjusted by the NATIONAL GEODETIC SURVEY
 HV1954.in June 1991.
 HV1954
 HV1954.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1954.GEOID18 height accuracy estimate available here.
 HV1954
 HV1954.Click photographs - Photos may exist for this station.
 HV1954
 HV1954.The dynamic height is computed by dividing the NAVD 88
 HV1954.geopotential number by the normal gravity value computed on the
 HV1954.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1954.degrees latitude (g = 980.6199 gals.).
 HV1954
 HV1954.The modeled gravity was interpolated from observed gravity values.
 HV1954
 HV1954
 HV1954_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ208100(NAD 83)
 HV1954
 HV1954                          SUPERSEDED SURVEY CONTROL
 HV1954
 HV1954  NGVD 29 (11/26/84)   81.948  (m)          268.86   (f) ADJUSTED    2 0
 HV1954
 HV1954.Superseded values are not recommended for survey control.
 HV1954
 HV1954.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1954.See file dsdata.pdf to determine how the superseded data were derived.
 HV1954
 HV1954_MARKER: Q = CHISELED SQUARE
 HV1954_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1954_SP_SET: STEP
 HV1954_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1954
 HV1954  HISTORY     - Date     Condition        Report By
 HV1954  HISTORY     - UNK      MONUMENTED       CGS
 HV1954  HISTORY     - 1927     GOOD             CGS
 HV1954
 HV1954                          STATION DESCRIPTION
 HV1954
 HV1954'DESCRIBED BY COAST AND GEODETIC SURVEY 1927
 HV1954'AT WASHINGTON.
 HV1954'LOCATED IN THE NW CORNER OF THE TOP STEP AT THE SOUTH ENTRANCE
 HV1954'TO THE MAIN BUILDING AT THE NAVAL OBSERVATORY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4312 ***********************************************************************
 HV4312  DESIGNATION -  MAJESTIC
 HV4312  PID         -  HV4312
 HV4312  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4312  COUNTRY     -  US
 HV4312  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4312
 HV4312                         *CURRENT SURVEY CONTROL
 HV4312  ______________________________________________________________________
 HV4312* NAD 83(1993) POSITION- 38 55 51.80634(N) 077 02 13.65267(W)   ADJUSTED
 HV4312  ______________________________________________________________________
 HV4312  GEOID HEIGHT    -        -32.013 (meters)                     GEOID18
 HV4312  LAPLACE CORR    -         -1.82  (seconds)                    DEFLEC18
 HV4312  HORZ ORDER      -  THIRD
 HV4312
 HV4312.The horizontal coordinates were established by classical geodetic methods
 HV4312.and adjusted by the National Geodetic Survey in November 1994.
 HV4312
 HV4312.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4312.GEOID18 height accuracy estimate available here.
 HV4312
 HV4312.Click photographs - Photos may exist for this station.
 HV4312
 HV4312.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4312
 HV4312. The following values were computed from the NAD 83(1993) position.
 HV4312
 HV4312;                    North         East     Units Scale Factor Converg.
 HV4312;SPC MD       -   140,353.577   396,780.972   MT  0.99995031   -0 01 23.9
 HV4312;SPC MD       -   460,476.69  1,301,772.24   sFT  0.99995031   -0 01 23.9
 HV4312;SPC VA N     - 2,141,358.406 3,626,836.402   MT  0.99996332   +0 54 46.8
 HV4312;SPC VA N     - 7,025,440.04 11,899,045.76   sFT  0.99996332   +0 54 46.8
 HV4312;UTM  18      - 4,311,098.987   323,422.745   MT  0.99998395   -1 16 49.5
 HV4312
 HV4312_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2342211098(NAD 83)
 HV4312
 HV4312                          SUPERSEDED SURVEY CONTROL
 HV4312
 HV4312  NAD 83(1991)-  38 55 51.80550(N)    077 02 13.65368(W) AD(       ) 3
 HV4312  NAD 83(1986)-  38 55 51.80500(N)    077 02 13.66403(W) AD(       ) 3
 HV4312  NAD 27      -  38 55 51.40700(N)    077 02 14.74400(W) AD(       ) 3
 HV4312
 HV4312.Superseded values are not recommended for survey control.
 HV4312
 HV4312.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4312.See file dsdata.pdf to determine how the superseded data were derived.
 HV4312
 HV4312_MARKER: 61 = POLE
 HV4312
 HV4312  HISTORY     - Date     Condition        Report By
 HV4312  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4312  HISTORY     - 19950623 GOOD             USPSQD
 HV4312
 HV4312                          STATION DESCRIPTION
 HV4312
 HV4312'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4312'ON THE ROOF OF THE MAJESTIC, APARTMENT HOUSE, 3200 - 16TH
 HV4312'ST., N.W.  THE STATION IS THE WESTERN OF TWO GALVANIZED IRON
 HV4312'PIPE, RADIO POLES AT THE SOUTHERN END OF RADIO ANTENNAS IN AN
 HV4312'L-SHAPED SYSTEM, 1.79 METERS FROM INNER EDGE OF WATER GUTTER
 HV4312'ON WESTERN SIDE OF BUILDING, 3.15 METERS FROM WEST FACE OF
 HV4312'NORTHERN PENTHOUSE, 6.235 METERS FROM SOUTHWEST CORNER AND
 HV4312'0.180 METERS SOUTH OF THE PLANE OF THE NORTH FACE OF THE
 HV4312'SAME PENTHOUSE.
 HV4312'
 HV4312'THE POLE WAS PAINTED WHITE IN ALTERNATING SECTIONS.
 HV4312
 HV4312                          STATION RECOVERY (1995)
 HV4312
 HV4312'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4312'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4166 ***********************************************************************
 HV4166  DESIGNATION -  MC KINLEY HIGH SCHOOL FINIAL
 HV4166  PID         -  HV4166
 HV4166  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4166  COUNTRY     -  US
 HV4166  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4166
 HV4166                         *CURRENT SURVEY CONTROL
 HV4166  ______________________________________________________________________
 HV4166* NAD 83(1993) POSITION- 38 54 53.13080(N) 077 00 16.33413(W)   ADJUSTED
 HV4166  ______________________________________________________________________
 HV4166  GEOID HEIGHT    -        -32.083 (meters)                     GEOID18
 HV4166  LAPLACE CORR    -         -3.39  (seconds)                    DEFLEC18
 HV4166  HORZ ORDER      -  THIRD
 HV4166
 HV4166.The horizontal coordinates were established by classical geodetic methods
 HV4166.and adjusted by the National Geodetic Survey in November 1994.
 HV4166
 HV4166.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4166.GEOID18 height accuracy estimate available here.
 HV4166
 HV4166.Click photographs - Photos may exist for this station.
 HV4166
 HV4166.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4166
 HV4166. The following values were computed from the NAD 83(1993) position.
 HV4166
 HV4166;                    North         East     Units Scale Factor Converg.
 HV4166;SPC MD       -   138,543.631   399,606.502   MT  0.99995008   -0 00 10.3
 HV4166;SPC MD       -   454,538.56  1,311,042.33   sFT  0.99995008   -0 00 10.3
 HV4166;SPC VA N     - 2,139,594.849 3,629,691.165   MT  0.99996181   +0 56 00.0
 HV4166;SPC VA N     - 7,019,654.10 11,908,411.76   sFT  0.99996181   +0 56 00.0
 HV4166;UTM  18      - 4,309,227.447   326,207.972   MT  0.99997193   -1 15 34.2
 HV4166
 HV4166_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2620709227(NAD 83)
 HV4166
 HV4166                          SUPERSEDED SURVEY CONTROL
 HV4166
 HV4166  NAD 83(1991)-  38 54 53.12976(N)    077 00 16.33496(W) AD(       ) 3
 HV4166  NAD 83(1986)-  38 54 53.12899(N)    077 00 16.34560(W) AD(       ) 3
 HV4166  NAD 27      -  38 54 52.73000(N)    077 00 17.43000(W) AD(       ) 3
 HV4166
 HV4166.Superseded values are not recommended for survey control.
 HV4166
 HV4166.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4166.See file dsdata.pdf to determine how the superseded data were derived.
 HV4166
 HV4166_MARKER: 82 = FINIAL
 HV4166
 HV4166  HISTORY     - Date     Condition        Report By
 HV4166  HISTORY     - 1934     FIRST OBSERVED   CGS
 HV4166  HISTORY     - 19950623 GOOD             USPSQD
 HV4166
 HV4166                          STATION DESCRIPTION
 HV4166
 HV4166'NO DESCRIPTIVE TEXT AVAILABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4281 ***********************************************************************
 HV4281  DESIGNATION -  MEDICO
 HV4281  PID         -  HV4281
 HV4281  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4281  COUNTRY     -  US
 HV4281  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4281
 HV4281                         *CURRENT SURVEY CONTROL
 HV4281  ______________________________________________________________________
 HV4281* NAD 83(1993) POSITION- 38 58 30.09313(N) 077 01 46.86903(W)   ADJUSTED
 HV4281  ______________________________________________________________________
 HV4281  GEOID HEIGHT    -        -31.981 (meters)                     GEOID18
 HV4281  LAPLACE CORR    -         -2.51  (seconds)                    DEFLEC18
 HV4281  HORZ ORDER      -  THIRD
 HV4281
 HV4281.The horizontal coordinates were established by classical geodetic methods
 HV4281.and adjusted by the National Geodetic Survey in November 1994.
 HV4281
 HV4281.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4281.GEOID18 height accuracy estimate available here.
 HV4281
 HV4281.Click photographs - Photos may exist for this station.
 HV4281
 HV4281.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4281
 HV4281. The following values were computed from the NAD 83(1993) position.
 HV4281
 HV4281;                    North         East     Units Scale Factor Converg.
 HV4281;SPC MD       -   145,234.251   397,427.644   MT  0.99995134   -0 01 07.1
 HV4281;SPC MD       -   476,489.37  1,303,893.86   sFT  0.99995134   -0 01 07.1
 HV4281;SPC VA N     - 2,146,249.068 3,627,403.242   MT  0.99996781   +0 55 03.5
 HV4281;SPC VA N     - 7,041,485.48 11,900,905.47   sFT  0.99996781   +0 55 03.5
 HV4281;UTM  18      - 4,315,964.444   324,176.415   MT  0.99998067   -1 16 37.1
 HV4281
 HV4281_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2417615964(NAD 83)
 HV4281
 HV4281                          SUPERSEDED SURVEY CONTROL
 HV4281
 HV4281  NAD 83(1991)-  38 58 30.09247(N)    077 01 46.86999(W) AD(       ) 3
 HV4281  NAD 83(1986)-  38 58 30.09169(N)    077 01 46.88002(W) AD(       ) 3
 HV4281  NAD 27      -  38 58 29.70100(N)    077 01 47.96300(W) AD(       ) 3
 HV4281
 HV4281.Superseded values are not recommended for survey control.
 HV4281
 HV4281.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4281.See file dsdata.pdf to determine how the superseded data were derived.
 HV4281
 HV4281_MARKER: 82 = FINIAL
 HV4281_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4281+SATELLITE: SATELLITE OBSERVATIONS - March 15, 2012
 HV4281
 HV4281  HISTORY     - Date     Condition        Report By
 HV4281  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4281  HISTORY     - 19950623 GOOD             USPSQD
 HV4281  HISTORY     - 20040320 GOOD             GEOCAC
 HV4281  HISTORY     - 20120315 GOOD             GEOCAC
 HV4281
 HV4281                          STATION DESCRIPTION
 HV4281
 HV4281'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4281'STATION IS THE FINIAL, PASSING THROUGH A SMALL GOLDEN BALL,
 HV4281'ON THE GREEN-ROOFED, OCTAGONAL CUPOLA OF THE ADMINISTRATION
 HV4281'BUILDING OF WALTER REED GENERAL HOSPITAL LOCATED N OF ASPEN
 HV4281'STREET BETWEEN GEORGIA AVENUE AND SIXTEENTH STREET, N.W.
 HV4281
 HV4281                          STATION RECOVERY (1995)
 HV4281
 HV4281'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4281'RECOVERED IN GOOD CONDITION.
 HV4281
 HV4281                          STATION RECOVERY (2004)
 HV4281
 HV4281'RECOVERY NOTE BY GEOCACHING 2004 (APC)
 HV4281'RECOVERED IN GOOD CONDITION.
 HV4281
 HV4281                          STATION RECOVERY (2012)
 HV4281
 HV4281'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV4281'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4315 ***********************************************************************
 HV4315  DESIGNATION -  MEMORIAL
 HV4315  PID         -  HV4315
 HV4315  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4315  COUNTRY     -  US
 HV4315  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4315
 HV4315                         *CURRENT SURVEY CONTROL
 HV4315  ______________________________________________________________________
 HV4315* NAD 83(1993) POSITION- 38 53 08.77709(N) 077 03 32.66463(W)   ADJUSTED
 HV4315* NAVD 88 ORTHO HEIGHT -     8.86  (+/-2cm)       29.1   (feet) VERTCON3
 HV4315  ______________________________________________________________________
 HV4315  GEOID HEIGHT    -        -32.064 (meters)                     GEOID18
 HV4315  LAPLACE CORR    -         -2.88  (seconds)                    DEFLEC18
 HV4315  HORZ ORDER      -  THIRD
 HV4315  VERT ORDER      -  THIRD ? (See Below)
 HV4315
 HV4315.The horizontal coordinates were established by classical geodetic methods
 HV4315.and adjusted by the National Geodetic Survey in November 1994.
 HV4315
 HV4315.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4315.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4315
 HV4315.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4315.GEOID18 height accuracy estimate available here.
 HV4315
 HV4315.The vertical order pertains to the NGVD 29 superseded value.
 HV4315
 HV4315.Click photographs - Photos may exist for this station.
 HV4315
 HV4315.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4315
 HV4315. The following values were computed from the NAD 83(1993) position.
 HV4315
 HV4315;                    North         East     Units Scale Factor Converg.
 HV4315;SPC MD       -   135,327.475   394,874.714   MT  0.99994986   -0 02 13.5
 HV4315;SPC MD       -   443,986.89  1,295,518.12   sFT  0.99994986   -0 02 13.5
 HV4315;SPC VA N     - 2,136,301.767 3,625,012.513   MT  0.99995932   +0 53 57.5
 HV4315;SPC VA N     - 7,008,850.05 11,893,061.89   sFT  0.99995932   +0 53 57.5
 HV4315;UTM  18      - 4,306,115.704   321,406.654   MT  0.99999277   -1 17 34.7
 HV4315
 HV4315!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4315!SPC MD       -   1.00000364  x   0.99994986  =   0.99995350
 HV4315!SPC VA N     -   1.00000364  x   0.99995932  =   0.99996296
 HV4315!UTM  18      -   1.00000364  x   0.99999277  =   0.99999641
 HV4315
 HV4315:                Primary Azimuth Mark                     Grid Az
 HV4315:SPC MD       -  ARLINGTON CEMETERY LEE MANSION           245 59 37.5
 HV4315:SPC VA N     -  ARLINGTON CEMETERY LEE MANSION           245 03 26.5
 HV4315:UTM  18      -  ARLINGTON CEMETERY LEE MANSION           247 14 58.7
 HV4315
 HV4315_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2140606115(NAD 83)
 HV4315
 HV4315|---------------------------------------------------------------------|
 HV4315| PID    Reference Object                     Distance      Geod. Az  |
 HV4315|                                                           dddmmss.s |
 HV4315| HV4264 OLD POST OFFICE FINIAL              APPROX. 2.9 KM 0703733.0 |
 HV4315| HV3621 ARLINGTON CEMETERY LEE MANSION      APPROX. 1.3 KM 2455724.0 |
 HV4315| HV3961 GEORGETOWN UNIV LOWER SPIRE         APPROX. 2.6 KM 3330335.7 |
 HV4315|---------------------------------------------------------------------|
 HV4315
 HV4315                          SUPERSEDED SURVEY CONTROL
 HV4315
 HV4315  NAD 83(1991)-  38 53 08.77581(N)    077 03 32.66615(W) AD(       ) 3
 HV4315  NAD 83(1986)-  38 53 08.77561(N)    077 03 32.67669(W) AD(       ) 3
 HV4315  NAD 27      -  38 53 08.37300(N)    077 03 33.75500(W) AD(       ) 3
 HV4315  NGVD 29               9.10   (m)           29.9    (f) LEVELING    3  
 HV4315
 HV4315.Superseded values are not recommended for survey control.
 HV4315
 HV4315.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4315.See file dsdata.pdf to determine how the superseded data were derived.
 HV4315
 HV4315_MARKER: DS = TRIANGULATION STATION DISK
 HV4315_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV4315_SP_SET: SIDEWALK
 HV4315_STAMPING: MEMORIAL 1946
 HV4315_MARK LOGO: CGS
 HV4315_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4315
 HV4315  HISTORY     - Date     Condition        Report By
 HV4315  HISTORY     - 1946     MONUMENTED       CGS
 HV4315  HISTORY     - 1974     GOOD             NGS
 HV4315  HISTORY     - 1979     GOOD             NGS
 HV4315
 HV4315                          STATION DESCRIPTION
 HV4315
 HV4315'DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (RCB)
 HV4315'THE STATION IS LOCATED NEAR THE S TOWER ON THE W END OF MEMORIAL
 HV4315'BRIDGE.  IT IS 90 FEET SW OF THE NW CORNER OF THE TOWER.  THE
 HV4315'MARK IS IN A DRILL HOLE IN THE SIDEWALK LEADING TO THE BRIDGE
 HV4315'AND IS STAMPED MEMORIAL 1946.  IT IS A BRONZE STATION DISK SET
 HV4315'IN CONCRETE.
 HV4315'
 HV4315'HEIGHT OF LIGHT ABOVE STATION MARK - 1 METER.
 HV4315
 HV4315                          STATION RECOVERY (1974)
 HV4315
 HV4315'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974 (GWJ)
 HV4315'STATION RECOVERED AS DESCRIBED BY RCB IN 1946.
 HV4315
 HV4315                          STATION RECOVERY (1979)
 HV4315
 HV4315'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 (BMP)
 HV4315'THE STATION WAS RECOVERED AS DESCRIBED IN 1946.
 HV4315'
 HV4315'THE STATION IS A STANDARD BRASS DISK STAMPED---MEMORIAL 1946---
 HV4315'SET IN A SIDEWALK IN THE AREA OF HIGH TRAFFIC. AUTOMOTIVE ON THE
 HV4315'ROAD AND JOGGERS AND BICYCLES ON THE SIDEWALK. PARKING, NOT LEGAL,
 HV4315'IS POSSIBLE AT THE FAR SIDE OF THE TRAFFIC CIRCLE ON THE WEST SIDE
 HV4315'OF MEMORIAL BRIDGE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1846 ***********************************************************************
 HV1846  DESIGNATION -  MERIDIAN STONE
 HV1846  PID         -  HV1846
 HV1846  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1846  COUNTRY     -  US
 HV1846  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1846
 HV1846                         *CURRENT SURVEY CONTROL
 HV1846  ______________________________________________________________________
 HV1846* NAD 83(2011) POSITION- 38 53 38.16944(N) 077 02 11.55811(W)   ADJUSTED
 HV1846* NAD 83(2011) ELLIP HT-   -26.883 (meters)        (06/27/12)   ADJUSTED
 HV1846* NAD 83(2011) EPOCH   -  2010.00
 HV1846* NAVD 88 ORTHO HEIGHT -     5.204 (meters)       17.07  (feet) ADJUSTED
 HV1846  ______________________________________________________________________
 HV1846  GEOID HEIGHT    -        -32.078 (meters)                     GEOID18
 HV1846  NAD 83(2011) X  -  1,115,076.651 (meters)                     COMP
 HV1846  NAD 83(2011) Y  - -4,844,021.236 (meters)                     COMP
 HV1846  NAD 83(2011) Z  -  3,983,142.673 (meters)                     COMP
 HV1846  LAPLACE CORR    -         -2.39  (seconds)                    DEFLEC18
 HV1846  DYNAMIC HEIGHT  -          5.201 (meters)       17.06  (feet) COMP
 HV1846  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 HV1846
 HV1846  VERT ORDER      -  FIRST     CLASS 0
 HV1846
 HV1846  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV1846  Standards:
 HV1846         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV1846            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV1846  -------------------------------------------------------------------
 HV1846  NETWORK    0.55   0.69           0.25   0.19   0.35     -0.05512653
 HV1846  -------------------------------------------------------------------
 HV1846  Click here for local accuracies and other accuracy information.
 HV1846
 HV1846.The horizontal coordinates were established by GPS observations
 HV1846.and adjusted by the National Geodetic Survey in June 2012.
 HV1846
 HV1846.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV1846.been affixed to the stable North American tectonic plate. See 
 HV1846.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV1846
 HV1846.The horizontal coordinates are valid at the epoch date displayed above
 HV1846.which is a decimal equivalence of Year/Month/Day.
 HV1846
 HV1846.The orthometric height was determined by differential leveling and
 HV1846.adjusted by the NATIONAL GEODETIC SURVEY
 HV1846.in February 1993.
 HV1846
 HV1846.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1846.GEOID18 height accuracy estimate available here.
 HV1846
 HV1846.Click photographs - Photos may exist for this station.
 HV1846
 HV1846.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV1846
 HV1846.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1846
 HV1846.The ellipsoidal height was determined by GPS observations
 HV1846.and is referenced to NAD 83.
 HV1846
 HV1846.The dynamic height is computed by dividing the NAVD 88
 HV1846.geopotential number by the normal gravity value computed on the
 HV1846.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1846.degrees latitude (g = 980.6199 gals.).
 HV1846
 HV1846.The modeled gravity was interpolated from observed gravity values.
 HV1846
 HV1846. The following values were computed from the NAD 83(2011) position.
 HV1846
 HV1846;                    North         East     Units Scale Factor Converg.
 HV1846;SPC MD       -   136,232.779   396,829.770   MT  0.99994990   -0 01 22.6
 HV1846;SPC MD       -   446,957.04  1,301,932.34   sFT  0.99994990   -0 01 22.6
 HV1846;SPC VA N     - 2,137,238.908 3,626,952.532   MT  0.99995999   +0 54 48.1
 HV1846;SPC VA N     - 7,011,924.65 11,899,426.77   sFT  0.99995999   +0 54 48.1
 HV1846;UTM  18      - 4,306,977.970   323,381.160   MT  0.99998413   -1 16 44.5
 HV1846
 HV1846!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1846!SPC MD       -   1.00000422  x   0.99994990  =   0.99995412
 HV1846!SPC VA N     -   1.00000422  x   0.99995999  =   0.99996421
 HV1846!UTM  18      -   1.00000422  x   0.99998413  =   0.99998835
 HV1846
 HV1846:                Primary Azimuth Mark                     Grid Az
 HV1846:SPC MD       -  OLD POST OFFICE FINIAL                   086 03 28.5
 HV1846:SPC VA N     -  OLD POST OFFICE FINIAL                   085 07 17.8
 HV1846:UTM  18      -  OLD POST OFFICE FINIAL                   087 18 50.4
 HV1846
 HV1846_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2338106977(NAD 83)
 HV1846
 HV1846|---------------------------------------------------------------------|
 HV1846| PID    Reference Object                     Distance      Geod. Az  |
 HV1846|                                                           dddmmss.s |
 HV1846| HV4264 OLD POST OFFICE FINIAL              APPROX. 0.8 KM 0860205.9 |
 HV1846| HV4442 WASHINGTON MONUMENT                 APPROX. 0.5 KM 1670914.7 |
 HV1846| UA0024 JEFFERSON PIER                      458.703 METERS 1800040.8 |
 HV1846| HV4531 WEST BASE                           133.960 METERS 28759     |
 HV1846| HV1847 ZERO MILESTONE                      130.069 METERS 35951     |
 HV1846|---------------------------------------------------------------------|
 HV1846
 HV1846                          SUPERSEDED SURVEY CONTROL
 HV1846
 HV1846  NAD 83(2007)-  38 53 38.16972(N)    077 02 11.55880(W) AD(2002.00) 0
 HV1846  ELLIP H (02/10/07)  -26.863  (m)                       GP(2002.00)    
 HV1846  ELLIP H (09/11/02)  -26.845  (m)                       GP(       ) 4 2
 HV1846  ELLIP H (08/09/02)  -26.811  (m)                       GP(       ) 4 2
 HV1846  NAD 83(1993)-  38 53 38.17002(N)    077 02 11.55845(W) AD(       ) B
 HV1846  ELLIP H (06/29/94)  -26.809  (m)                       GP(       ) 4 1
 HV1846  NAD 83(1993)-  38 53 38.17004(N)    077 02 11.55845(W) AD(       ) B
 HV1846  ELLIP H (04/04/94)  -26.809  (m)                       GP(       ) 4 1
 HV1846  NAD 83(1991)-  38 53 38.17011(N)    077 02 11.55833(W) AD(       ) B
 HV1846  ELLIP H (12/31/92)  -26.841  (m)                       GP(       ) 4 2
 HV1846  NAD 83(1991)-  38 53 38.17010(N)    077 02 11.56021(W) AD(       ) 3
 HV1846  NAD 83(1986)-  38 53 38.16962(N)    077 02 11.57082(W) AD(       ) 3
 HV1846  USSD        -  38 53 38.10500(N)    077 02 12.47800(W) AD(       ) 3
 HV1846  NAVD 88               5.20   (m)           17.1    (f) LEVELING    3  
 HV1846  NAVD 88 (??/??/92)    5.192  (m)           17.03   (f) SUPERSEDED  1 0
 HV1846  NAVD 88               5.21   (m)           17.1    (f) LEVELING    3  
 HV1846  NGVD 29 (08/12/92)    5.436  (m)           17.83   (f) ADJUSTED    1 0
 HV1846  NGVD 29 (??/??/87)    5.452  (m)           17.89   (f) SUPERSEDED  1 0
 HV1846  NGVD 29 (07/19/86)    5.4    (m)           18.     (f) VERT ANG       
 HV1846
 HV1846.Superseded values are not recommended for survey control.
 HV1846
 HV1846.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1846.See file dsdata.pdf to determine how the superseded data were derived.
 HV1846
 HV1846_MARKER: B = BOLT
 HV1846_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1846_SP_SET: GRANITE STONE
 HV1846_MARK LOGO: NONE
 HV1846_PROJECTION: FLUSH
 HV1846_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1846_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1846_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1846+SATELLITE: SATELLITE OBSERVATIONS - April 10, 2014
 HV1846
 HV1846  HISTORY     - Date     Condition        Report By
 HV1846  HISTORY     - 1890     MONUMENTED       CGS
 HV1846  HISTORY     - 1921     GOOD             CGS
 HV1846  HISTORY     - 1942     GOOD             CGS
 HV1846  HISTORY     - 1979     GOOD             NGS
 HV1846  HISTORY     - 19920427 GOOD             NGS
 HV1846  HISTORY     - 19920615 GOOD             NGS
 HV1846  HISTORY     - 19920616 GOOD             NGS
 HV1846  HISTORY     - 19930824 GOOD             WOOLPT
 HV1846  HISTORY     - 19960718 GOOD             DMW
 HV1846  HISTORY     - 19980928 GOOD             NGS
 HV1846  HISTORY     - 20030515 GOOD             DMW
 HV1846  HISTORY     - 20040612 GOOD             NGS
 HV1846  HISTORY     - 20090319 GOOD             GEOCAC
 HV1846  HISTORY     - 20100301 GOOD             NGS
 HV1846  HISTORY     - 20110806 GOOD             GEOCAC
 HV1846  HISTORY     - 20140410 GOOD             NGS
 HV1846
 HV1846                          STATION DESCRIPTION
 HV1846
 HV1846'DESCRIBED BY COAST AND GEODETIC SURVEY 1921
 HV1846'AT WASHINGTON.
 HV1846'AT WASHINGTON, NORTH OF THE WASHINGTON MONUMENT, SOUTH OF THE
 HV1846'WHITE HOUSE, AT THE CENTER OF THE ELLIPSE, AND AT THE
 HV1846'MERIDIAN STONE (THIS SQUARE STONE IS MARKED U.S. MERIDIAN
 HV1846'1890 AND SET FLUSH WITH THE GROUND).  A COPPER BOLT, SET IN
 HV1846'THE TOP OF THE STONE.
 HV1846
 HV1846                          STATION RECOVERY (1942)
 HV1846
 HV1846'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1942
 HV1846'RECOVERED IN GOOD CONDITION.
 HV1846
 HV1846                          STATION RECOVERY (1979)
 HV1846
 HV1846'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1846'RECOVERED IN GOOD CONDITION.
 HV1846
 HV1846                          STATION RECOVERY (1992)
 HV1846
 HV1846'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1846'THE STATION IS IN WASHINGTON, D.C., NORTH-NORTHWEST OF THE WASHINGTON
 HV1846'MONUMENT, SOUTH OF THE WHITE HOUSE, AT THE CENTER OF THE ELLIPSE
 HV1846'AREA. OWENERSHIP--UNITED STATES DEPARTMENT OF INTERIOR, NATIONAL PARK
 HV1846'SERVICE.  PHONE (202) 755-7798.  PERMISSION MUST BE OBTAINED IN
 HV1846'ADVANCE.
 HV1846'THE STATION IS A DRILL HOLE IN THE TOP OF A BOLT THAT IS SET IN A
 HV1846'SQUARE STONE THAT IS MARKED U.S. MERIDIAN 1890 AND SET FLUSH WITH THE
 HV1846'GROUND.
 HV1846'THE STATION IS 24.35 M (79.89 FT) NORTH-NORTHEAST FROM THE CENTER OF A
 HV1846'METAL MANHOLE COVER, 3.2 M (10.5 FT) SOUTH FROM A TEMPORARY CHAIN
 HV1846'LINK FENCE AND 2.2 M (7.2 FT) SOUTHWEST FROM THE CENTER OF A MANHOLE
 HV1846'COVER.
 HV1846
 HV1846                          STATION RECOVERY (1992)
 HV1846
 HV1846'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1846'IN WASHINGTON, D.C., NORTH OF THE WASHINGTON MONUMENT, SOUTH OF THE
 HV1846'WHITE HOUSE, NEAR THE CENTER OF THE ELLIPSE, AND AT THE MERIDIAN
 HV1846'STONE (THIS SQUARE STONE IS MARKED U.S. MERIDIAN 1890 AND SET FLUSH
 HV1846'WITH THE GROUND).  A COPPER BOLT, SET IN THE TOP OF THE STONE.
 HV1846
 HV1846                          STATION RECOVERY (1992)
 HV1846
 HV1846'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1846'THE STATION IS IN WASHINGTON, D.C., NORTH-NORTHWEST OF THE WASHINGTON
 HV1846'MONUMENT, SOUTH OF THE WHITE HOUSE, AT THE CENTER OF THE ELLIPSE
 HV1846'AREA. OWENERSHIP--UNITED STATES DEPARTMENT OF INTERIOR, NATIONAL PARK
 HV1846'SERVICE.
 HV1846'THE STATION IS A DRILL HOLE IN THE TOP OF A BOLT THAT IS SET IN A
 HV1846'SQUARE STONE THAT IS MARKED U.S. MERIDIAN 1890 AND SET FLUSH WITH THE
 HV1846'GROUND.
 HV1846'THE STATION IS 24.35 M (79.89 FT) NORTH-NORTHEAST FROM THE CENTER OF A
 HV1846'METAL MANHOLE COVER, 3.2 M (10.50 FT) SOUTH FROM A TEMPORARY CHAIN
 HV1846'LINK FENCE, 2.2 M (7.22 FT) SOUTHWEST FROM THE CENTER OF A MANHOLE
 HV1846'COVER.
 HV1846
 HV1846                          STATION RECOVERY (1993)
 HV1846
 HV1846'RECOVERY NOTE BY WOOLPERT CONSULTANTS 1993 (TM)
 HV1846'RECOVERED AS DESCRIBED.
 HV1846
 HV1846                          STATION RECOVERY (1996)
 HV1846
 HV1846'RECOVERY NOTE BY DAFT MCCUNE WALKER INCORPORATED 1996 (JMS)
 HV1846'RECOVERED AS DESCRIBED.
 HV1846
 HV1846                          STATION RECOVERY (1998)
 HV1846
 HV1846'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1998 (RLA)
 HV1846'RECOVERED AS DESCRIBED.
 HV1846
 HV1846                          STATION RECOVERY (2003)
 HV1846
 HV1846'RECOVERY NOTE BY DAFT MCCUNE WALKER INCORPORATED 2003 (JMS)
 HV1846'THE PREVIOUSLY-REFERENCED TEMPORARY CHAINLINK FENCE HAS SINCE MOVED
 HV1846'AND IS NO LONGER A VALID RECOVERY REFERENCE.
 HV1846
 HV1846                          STATION RECOVERY (2004)
 HV1846
 HV1846'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2004 (DW)
 HV1846'THE 'ME' HAS BEEN OBLITERATED, PRESUMABLY BY A LAWN MOWER.
 HV1846
 HV1846                          STATION RECOVERY (2009)
 HV1846
 HV1846'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV1846'RECOVERED IN GOOD CONDITION.
 HV1846
 HV1846                          STATION RECOVERY (2010)
 HV1846
 HV1846'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2010 (DRD)
 HV1846'RECOVERED AS DESCRIBED.
 HV1846
 HV1846                          STATION RECOVERY (2011)
 HV1846
 HV1846'RECOVERY NOTE BY GEOCACHING 2011 (MFM)
 HV1846'RECOVERED IN GOOD CONDITION.
 HV1846'
 HV1846'NOTE THAT STATION MAY BE COMPROMISED IN THE NEAR FUTURE DUE TO THE
 HV1846'SELECTED ELLIPSE REDESIGN PLAN, WHICH PLANS DATED AS OF JUL 11TH 2011
 HV1846'INVOLVES RAISING THE HEIGHT OF THE GROUND WITHIN THE ELLIPSE.
 HV1846
 HV1846                          STATION RECOVERY (2014)
 HV1846
 HV1846'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (KF)
 HV1846'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DO1149 ***********************************************************************
 DO1149  DESIGNATION -  MLK 4120
 DO1149  PID         -  DO1149
 DO1149  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DO1149  COUNTRY     -  US
 DO1149  USGS QUAD   -  WASHINGTON WEST (2016)
 DO1149
 DO1149                         *CURRENT SURVEY CONTROL
 DO1149  ______________________________________________________________________
 DO1149* NAD 83(1986) POSITION- 38 53 11.94   (N) 077 02 34.93   (W)   HD_HELD1
 DO1149* NAVD 88 ORTHO HEIGHT -     2.943 (meters)        9.66  (feet) ADJUSTED
 DO1149  ______________________________________________________________________
 DO1149  GEOID HEIGHT    -        -32.084 (meters)                     GEOID18
 DO1149  DYNAMIC HEIGHT  -          2.941 (meters)        9.65  (feet) COMP
 DO1149  MODELED GRAVITY -    980,096.6   (mgal)                       NAVD 88
 DO1149
 DO1149  VERT ORDER      -  FIRST     CLASS II
 DO1149
 DO1149.The horizontal coordinates were determined by differentially corrected
 DO1149.hand held GPS observations or other comparable positioning techniques
 DO1149.and have an estimated accuracy of +/- 3 meters.
 DO1149
 DO1149.The orthometric height was determined by differential leveling and
 DO1149.adjusted by the NATIONAL GEODETIC SURVEY
 DO1149.in October 2012.
 DO1149
 DO1149.No vertical observational check was made to the station.
 DO1149
 DO1149.Significant digits in the geoid height do not necessarily reflect accuracy.
 DO1149.GEOID18 height accuracy estimate available here.
 DO1149
 DO1149.Click photographs - Photos may exist for this station.
 DO1149
 DO1149.The dynamic height is computed by dividing the NAVD 88
 DO1149.geopotential number by the normal gravity value computed on the
 DO1149.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DO1149.degrees latitude (g = 980.6199 gals.).
 DO1149
 DO1149.The modeled gravity was interpolated from observed gravity values.
 DO1149
 DO1149
 DO1149_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2279906181(NAD 83)
 DO1149
 DO1149                          SUPERSEDED SURVEY CONTROL
 DO1149
 DO1149.No superseded survey control is available for this station.
 DO1149
 DO1149_MARKER: DD = SURVEY DISK
 DO1149_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DO1149_STAMPING: MLK-4120 MARCH 2012
 DO1149_MARK LOGO: NPS
 DO1149_PROJECTION: FLUSH
 DO1149_MAGNETIC: N = NO MAGNETIC MATERIAL
 DO1149_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DO1149+STABILITY: SURFACE MOTION
 DO1149_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 DO1149+SATELLITE: SATELLITE OBSERVATIONS - December 31, 2024
 DO1149
 DO1149  HISTORY     - Date     Condition        Report By
 DO1149  HISTORY     - 20120628 MONUMENTED       DI
 DO1149  HISTORY     - 20160324 GOOD             BASE9
 DO1149  HISTORY     - 20180718 GOOD             USPSQD
 DO1149  HISTORY     - 20241231 GOOD             INDIV
 DO1149
 DO1149                          STATION DESCRIPTION
 DO1149
 DO1149'DESCRIBED BY US DEPARTMENT OF INTERIOR 2012 (DBC)
 DO1149'THE MARK IS LOCATED SOUTHWEST QUAD OF DC NEAR MARTIN LUTHER KING
 DO1149'VISITOR CENTER.
 DO1149'
 DO1149'TO REACH THE MARK FROM LINCOLN MEMORIAL CIR GO SOUTH ON 23RD ST 0.09
 DO1149'MI (0.1 KM) TURN LEFT ON INDEPENDENCE AVENUE GO 0.38 MI (0.6 KM) TO
 DO1149'THE MARK ON THE RIGHT.
 DO1149'
 DO1149'IT IS 30.6 FT (9.3 M) WEST OF THE CURB FROM INDEPENDENCE AVENUE, FIVE
 DO1149'LIGHT POLES FROM THE INTERSECTION OF INDEPENDENCE AND WEST BASIN DR,
 DO1149'40.1 FT (12.2 M) SOUTHWEST OF RETAINING WALL.
 DO1149
 DO1149                          STATION RECOVERY (2016)
 DO1149
 DO1149'RECOVERY NOTE BY BASE 9 GEODETIC CONSULTING SERVICE 2016 (DRD)
 DO1149'RECOVERED IN GOOD CONDITION.
 DO1149
 DO1149                          STATION RECOVERY (2018)
 DO1149
 DO1149'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 DO1149'RECOVERED IN GOOD CONDITION.
 DO1149
 DO1149                          STATION RECOVERY (2024)
 DO1149
 DO1149'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2024 (EF)
 DO1149'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DO1147 ***********************************************************************
 DO1147  DESIGNATION -  MLK 4130
 DO1147  PID         -  DO1147
 DO1147  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DO1147  COUNTRY     -  US
 DO1147  USGS QUAD   -  WASHINGTON WEST (2016)
 DO1147
 DO1147                         *CURRENT SURVEY CONTROL
 DO1147  ______________________________________________________________________
 DO1147* NAD 83(1986) POSITION- 38 53 09.3    (N) 077 02 39.8    (W)   HD_HELD2
 DO1147* NAVD 88 ORTHO HEIGHT -     1.227 (meters)        4.03  (feet) ADJUSTED
 DO1147  ______________________________________________________________________
 DO1147  GEOID HEIGHT    -        -32.084 (meters)                     GEOID18
 DO1147  DYNAMIC HEIGHT  -          1.226 (meters)        4.02  (feet) COMP
 DO1147  MODELED GRAVITY -    980,096.4   (mgal)                       NAVD 88
 DO1147
 DO1147  VERT ORDER      -  FIRST     CLASS II
 DO1147
 DO1147.The horizontal coordinates were established by autonomous hand held GPS
 DO1147.observations and have an estimated accuracy of +/- 10 meters.
 DO1147
 DO1147.The orthometric height was determined by differential leveling and
 DO1147.adjusted by the NATIONAL GEODETIC SURVEY
 DO1147.in October 2012.
 DO1147
 DO1147.No vertical observational check was made to the station.
 DO1147
 DO1147.Significant digits in the geoid height do not necessarily reflect accuracy.
 DO1147.GEOID18 height accuracy estimate available here.
 DO1147
 DO1147.Click photographs - Photos may exist for this station.
 DO1147
 DO1147.The dynamic height is computed by dividing the NAVD 88
 DO1147.geopotential number by the normal gravity value computed on the
 DO1147.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DO1147.degrees latitude (g = 980.6199 gals.).
 DO1147
 DO1147.The modeled gravity was interpolated from observed gravity values.
 DO1147
 DO1147
 DO1147_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2268006103(NAD 83)
 DO1147
 DO1147                          SUPERSEDED SURVEY CONTROL
 DO1147
 DO1147.No superseded survey control is available for this station.
 DO1147
 DO1147_MARKER: DB = BENCH MARK DISK
 DO1147_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DO1147_STAMPING: MLK 4130 2012
 DO1147_MARK LOGO: DI
 DO1147_PROJECTION: FLUSH
 DO1147_MAGNETIC: N = NO MAGNETIC MATERIAL
 DO1147_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DO1147+STABILITY: SURFACE MOTION
 DO1147_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 DO1147+SATELLITE: SATELLITE OBSERVATIONS - June 28, 2012
 DO1147
 DO1147  HISTORY     - Date     Condition        Report By
 DO1147  HISTORY     - 20120628 MONUMENTED       DI
 DO1147
 DO1147                          STATION DESCRIPTION
 DO1147
 DO1147'DESCRIBED BY US DEPARTMENT OF INTERIOR 2012 (DBC)
 DO1147'THE MARK IS LOCATED SOUTHWEST QUAD OF DC NEAR MARTIN LUTHER KING
 DO1147'VISITOR CENTER.
 DO1147'
 DO1147'TO REACH THE MARK FROM LINCOLN MEMORIAL CIR GO SOUTH ON 23RD ST 0.09
 DO1147'MI (0.1 KM) CONTINUE AHEAD AROUND TURNABOUT FOR 0.04 MI (0.1 KM) TO
 DO1147'OHIO DRIVE.  CONTINUE AHEAD ON OHIO DRIVE FOR 0.26 MI (0.4 KM) TO WEST
 DO1147'BASIN DRIVE.  TURN LEFT AND GO.15 MI ALONG WEST BASIN DRIVE GO TO THE
 DO1147'ENTRANCE TO MARTIN LUTHER KING MEMORIAL.  YOU WILL HAVE PACK IN FROM
 DO1147'THIS POINT.  GO 0.03 MI (0.0 KM) SOUTHEAST TO THE WALKWAY OF THE TIDAL
 DO1147'BASIN.  TURN RIGHT AND GO 0.01 MI (0.0 KM) SOUTH-SOUTHWEST TO THE MARK
 DO1147'ON THE RIGHT.
 DO1147'
 DO1147'IT IS 19.6 FT (6.0 M) NORTH OF THE TIDAL BASIN HEADWALL, 52.1 FT (15.9
 DO1147'M) NORTHWEST OF THE SOUTHEAST CORNER OF THE RETAINING WALL, 35.5 FT
 DO1147'(10.8 M) SOUTH OF THE RETAINING WALL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DO1145 ***********************************************************************
 DO1145  DESIGNATION -  MLK 4140
 DO1145  PID         -  DO1145
 DO1145  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DO1145  COUNTRY     -  US
 DO1145  USGS QUAD   -  WASHINGTON WEST (2016)
 DO1145
 DO1145                         *CURRENT SURVEY CONTROL
 DO1145  ______________________________________________________________________
 DO1145* NAD 83(1986) POSITION- 38 53 07.43   (N) 077 02 42.73   (W)   HD_HELD1
 DO1145* NAVD 88 ORTHO HEIGHT -     2.693 (meters)        8.84  (feet) ADJUSTED
 DO1145  ______________________________________________________________________
 DO1145  GEOID HEIGHT    -        -32.083 (meters)                     GEOID18
 DO1145  DYNAMIC HEIGHT  -          2.692 (meters)        8.83  (feet) COMP
 DO1145  MODELED GRAVITY -    980,096.3   (mgal)                       NAVD 88
 DO1145
 DO1145  VERT ORDER      -  FIRST     CLASS II
 DO1145
 DO1145.The horizontal coordinates were determined by differentially corrected
 DO1145.hand held GPS observations or other comparable positioning techniques
 DO1145.and have an estimated accuracy of +/- 3 meters.
 DO1145
 DO1145.The orthometric height was determined by differential leveling and
 DO1145.adjusted by the NATIONAL GEODETIC SURVEY
 DO1145.in October 2012.
 DO1145
 DO1145.No vertical observational check was made to the station.
 DO1145
 DO1145.Significant digits in the geoid height do not necessarily reflect accuracy.
 DO1145.GEOID18 height accuracy estimate available here.
 DO1145
 DO1145.Click photographs - Photos may exist for this station.
 DO1145
 DO1145.The dynamic height is computed by dividing the NAVD 88
 DO1145.geopotential number by the normal gravity value computed on the
 DO1145.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DO1145.degrees latitude (g = 980.6199 gals.).
 DO1145
 DO1145.The modeled gravity was interpolated from observed gravity values.
 DO1145
 DO1145
 DO1145_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2260806047(NAD 83)
 DO1145
 DO1145                          SUPERSEDED SURVEY CONTROL
 DO1145
 DO1145.No superseded survey control is available for this station.
 DO1145
 DO1145_MARKER: DD = SURVEY DISK
 DO1145_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DO1145_STAMPING: MLK-4140 MARCH 2012
 DO1145_MARK LOGO: NPS
 DO1145_PROJECTION: RECESSED 1 CENTIMETERS
 DO1145_MAGNETIC: N = NO MAGNETIC MATERIAL
 DO1145_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DO1145+STABILITY: SURFACE MOTION
 DO1145_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 DO1145+SATELLITE: SATELLITE OBSERVATIONS - June 28, 2012
 DO1145
 DO1145  HISTORY     - Date     Condition        Report By
 DO1145  HISTORY     - 20120628 MONUMENTED       DI
 DO1145  HISTORY     - 20160324 GOOD             BASE9
 DO1145  HISTORY     - 20241231 GOOD             INDIV
 DO1145
 DO1145                          STATION DESCRIPTION
 DO1145
 DO1145'DESCRIBED BY US DEPARTMENT OF INTERIOR 2012 (DBC)
 DO1145'THE MARK IS LOCATED SOUTHWEST QUAD OF DC NEAR MARTIN LUTHER KING
 DO1145'VISITOR CENTER.
 DO1145'
 DO1145'TO REACH THE MARK FROM LINCOLN MEMORIAL CIR GO SOUTH ON 23RD ST 0.09
 DO1145'MI (0.1 KM) CONTINUE AHEAD AROUND TURNABOUT FOR 0.04 MI (0.1 KM) TO
 DO1145'OHIO DRIVE.  CONTINUE AHEAD ON OHIO DRIVE FOR 0.26 MI (0.4 KM) TO WEST
 DO1145'BASIN DRIVE.  TURN LEFT AND GO.15 MI ALONG WEST BASIN DRIVE TO MARK ON
 DO1145'THE LEFT.
 DO1145'
 DO1145'IT IS 37.8 FT (11.5 M) WEST OF THE CURB ON WEST BASIN DR, 47.1 FT
 DO1145'(14.4 M) WEST NORTH WEST FROM THE LIGHT POLE, 58.8 FT (17.9 M) EAST OF
 DO1145'THE BLACK FENCE.
 DO1145
 DO1145                          STATION RECOVERY (2016)
 DO1145
 DO1145'RECOVERY NOTE BY BASE 9 GEODETIC CONSULTING SERVICE 2016 (DRD)
 DO1145'RECOVERED IN GOOD CONDITION.
 DO1145
 DO1145                          STATION RECOVERY (2024)
 DO1145
 DO1145'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2024 (EF)
 DO1145'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DO1148 ***********************************************************************
 DO1148  DESIGNATION -  MLK MEMORIAL STATUE
 DO1148  PID         -  DO1148
 DO1148  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DO1148  COUNTRY     -  US
 DO1148  USGS QUAD   -  WASHINGTON WEST (2016)
 DO1148
 DO1148                         *CURRENT SURVEY CONTROL
 DO1148  ______________________________________________________________________
 DO1148* NAD 83(1986) POSITION- 38 53 10.5    (N) 077 02 39.4    (W)   HD_HELD2
 DO1148* NAVD 88 ORTHO HEIGHT -     2.480 (meters)        8.14  (feet) ADJUSTED
 DO1148  ______________________________________________________________________
 DO1148  GEOID HEIGHT    -        -32.083 (meters)                     GEOID18
 DO1148  DYNAMIC HEIGHT  -          2.478 (meters)        8.13  (feet) COMP
 DO1148  MODELED GRAVITY -    980,096.4   (mgal)                       NAVD 88
 DO1148
 DO1148  VERT ORDER      -  FIRST     CLASS II
 DO1148
 DO1148.The horizontal coordinates were established by autonomous hand held GPS
 DO1148.observations and have an estimated accuracy of +/- 10 meters.
 DO1148
 DO1148.The orthometric height was determined by differential leveling and
 DO1148.adjusted by the NATIONAL GEODETIC SURVEY
 DO1148.in October 2012.
 DO1148
 DO1148.Significant digits in the geoid height do not necessarily reflect accuracy.
 DO1148.GEOID18 height accuracy estimate available here.
 DO1148
 DO1148.Click photographs - Photos may exist for this station.
 DO1148
 DO1148.The dynamic height is computed by dividing the NAVD 88
 DO1148.geopotential number by the normal gravity value computed on the
 DO1148.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DO1148.degrees latitude (g = 980.6199 gals.).
 DO1148
 DO1148.The modeled gravity was interpolated from observed gravity values.
 DO1148
 DO1148
 DO1148_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2269106139(NAD 83)
 DO1148
 DO1148                          SUPERSEDED SURVEY CONTROL
 DO1148
 DO1148.No superseded survey control is available for this station.
 DO1148
 DO1148_MARKER: Z = SEE DESCRIPTION
 DO1148_SETTING: 0 = UNSPECIFIED SETTING
 DO1148_SP_SET: STATUE BASE
 DO1148_MARK LOGO: NONE
 DO1148_MAGNETIC: N = NO MAGNETIC MATERIAL
 DO1148_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 DO1148
 DO1148  HISTORY     - Date     Condition        Report By
 DO1148  HISTORY     - 20120628 MONUMENTED       DI
 DO1148
 DO1148                          STATION DESCRIPTION
 DO1148
 DO1148'DESCRIBED BY US DEPARTMENT OF INTERIOR 2012 (DBC)
 DO1148'THE MARK IS LOCATED SOUTHWEST QUAD OF DC NEAR MARTIN LUTHER KING
 DO1148'VISITOR CENTER.
 DO1148'
 DO1148'TO REACH THE MARK FROM LINCOLN MEMORIAL CIR GO SOUTH ON 23RD ST 0.09
 DO1148'MI (0.1 KM) CONTINUE AHEAD AROUND TURNABOUT FOR 0.04 MI (0.1 KM) TO
 DO1148'OHIO DRIVE.  CONTINUE AHEAD ON OHIO DRIVE FOR 0.26 MI (0.4 KM) TO WEST
 DO1148'BASIN DRIVE.  TURN LEFT AND GO.15 MI ALONG WEST BASIN DRIVE GO TO THE
 DO1148'ENTRANCE TO MARTIN LUTHER KING MEMORIAL.  YOU WILL HAVE PACK IN FROM
 DO1148'THIS POINT.
 DO1148'
 DO1148'IT IS 24.1 FT (7.3 M) SOUTH OF THE EAST ENTRANCE STONE, 109 FT (33.2
 DO1148'M) NORTH OF THE TIDAL BASIN HEADWALL, 63.2 FT (19.3 M) EAST OF THE
 DO1148'RETAINING WALL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7683 ***********************************************************************
 HV7683  DESIGNATION -  MONASTERY FINIAL ON DOME
 HV7683  PID         -  HV7683
 HV7683  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7683  COUNTRY     -  US
 HV7683  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7683
 HV7683                         *CURRENT SURVEY CONTROL
 HV7683  ______________________________________________________________________
 HV7683* NAD 83(1993) POSITION- 38 56 14.99325(N) 076 59 06.85816(W)   ADJUSTED
 HV7683  ______________________________________________________________________
 HV7683  GEOID HEIGHT    -        -32.080 (meters)                     GEOID18
 HV7683  LAPLACE CORR    -         -3.99  (seconds)                    DEFLEC18
 HV7683  HORZ ORDER      -  THIRD
 HV7683
 HV7683.The horizontal coordinates were established by classical geodetic methods
 HV7683.and adjusted by the National Geodetic Survey in November 1994.
 HV7683
 HV7683.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7683.GEOID18 height accuracy estimate available here.
 HV7683
 HV7683.Click photographs - Photos may exist for this station.
 HV7683
 HV7683.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7683
 HV7683. The following values were computed from the NAD 83(1993) position.
 HV7683
 HV7683;                    North         East     Units Scale Factor Converg.
 HV7683;SPC MD       -   141,068.012   401,279.807   MT  0.99995043   +0 00 33.4
 HV7683;SPC MD       -   462,820.64  1,316,532.17   sFT  0.99995043   +0 00 33.4
 HV7683;SPC VA N     - 2,142,146.264 3,631,323.023   MT  0.99996394   +0 56 43.4
 HV7683;SPC VA N     - 7,028,024.87 11,913,765.62   sFT  0.99996394   +0 56 43.4
 HV7683;UTM  18      - 4,311,714.559   327,936.280   MT  0.99996457   -1 14 52.7
 HV7683
 HV7683_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2793611714(NAD 83)
 HV7683
 HV7683                          SUPERSEDED SURVEY CONTROL
 HV7683
 HV7683  NAD 83(1991)-  38 56 14.99244(N)    076 59 06.85876(W) AD(       ) 3
 HV7683  NAD 83(1986)-  38 56 14.99158(N)    076 59 06.86936(W) AD(       ) 3
 HV7683  NAD 27      -  38 56 14.59300(N)    076 59 07.94900(W) AD(       ) 3
 HV7683  USSD        -  38 56 14.93100(N)    076 59 07.78200(W) AD(       ) 3
 HV7683
 HV7683.Superseded values are not recommended for survey control.
 HV7683
 HV7683.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7683.See file dsdata.pdf to determine how the superseded data were derived.
 HV7683
 HV7683_MARKER: 82 = FINIAL
 HV7683_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV7683+SATELLITE: SATELLITE OBSERVATIONS - March 19, 2009
 HV7683
 HV7683  HISTORY     - Date     Condition        Report By
 HV7683  HISTORY     - 1917     FIRST OBSERVED   CGS
 HV7683  HISTORY     - 19950623 GOOD             USPSQD
 HV7683  HISTORY     - 20031201 GOOD             USPSQD
 HV7683  HISTORY     - 20090319 GOOD             GEOCAC
 HV7683
 HV7683                          STATION DESCRIPTION
 HV7683
 HV7683'NO DESCRIPTIVE TEXT AVAILABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4251 ***********************************************************************
 HV4251  DESIGNATION -  MOTOR
 HV4251  PID         -  HV4251
 HV4251  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4251  COUNTRY     -  US
 HV4251  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4251
 HV4251                         *CURRENT SURVEY CONTROL
 HV4251  ______________________________________________________________________
 HV4251* NAD 83(1993) POSITION- 38 52 51.36488(N) 077 02 34.32052(W)   ADJUSTED
 HV4251* NAVD 88 ORTHO HEIGHT -     1.8   (meters)        6.    (feet) VERTCON3
 HV4251  ______________________________________________________________________
 HV4251  GEOID HEIGHT    -        -32.095 (meters)                     GEOID18
 HV4251  LAPLACE CORR    -         -2.65  (seconds)                    DEFLEC18
 HV4251  HORZ ORDER      -  THIRD
 HV4251
 HV4251.The horizontal coordinates were established by classical geodetic methods
 HV4251.and adjusted by the National Geodetic Survey in November 1994.
 HV4251
 HV4251.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4251.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4251
 HV4251.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4251.GEOID18 height accuracy estimate available here.
 HV4251
 HV4251.Click photographs - Photos may exist for this station.
 HV4251
 HV4251.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4251
 HV4251. The following values were computed from the NAD 83(1993) position.
 HV4251
 HV4251;                    North         East     Units Scale Factor Converg.
 HV4251;SPC MD       -   134,789.776   396,280.573   MT  0.99994985   -0 01 36.9
 HV4251;SPC MD       -   442,222.79  1,300,130.51   sFT  0.99994985   -0 01 36.9
 HV4251;SPC VA N     - 2,135,787.109 3,626,426.985   MT  0.99995893   +0 54 33.9
 HV4251;SPC VA N     - 7,007,161.54 11,897,702.53   sFT  0.99995893   +0 54 33.9
 HV4251;UTM  18      - 4,305,547.300   322,800.447   MT  0.99998666   -1 16 57.5
 HV4251
 HV4251!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4251!SPC MD       -   1.00000476  x   0.99994985  =   0.99995461
 HV4251!SPC VA N     -   1.00000476  x   0.99995893  =   0.99996369
 HV4251!UTM  18      -   1.00000476  x   0.99998666  =   0.99999142
 HV4251
 HV4251:                Primary Azimuth Mark                     Grid Az
 HV4251:SPC MD       -  USED 1330                                215 32 51.7
 HV4251:SPC VA N     -  USED 1330                                214 36 40.9
 HV4251:UTM  18      -  USED 1330                                216 48 12.3
 HV4251
 HV4251_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2280005547(NAD 83)
 HV4251
 HV4251|---------------------------------------------------------------------|
 HV4251| PID    Reference Object                     Distance      Geod. Az  |
 HV4251|                                                           dddmmss.s |
 HV4251| HV4436 TIDAL USE                            41.789 METERS 13133     |
 HV4251| HV4525 USED 1330                           APPROX. 0.6 KM 2153114.8 |
 HV4251| DC6913 MOTOR RM 1                            8.717 METERS 23513     |
 HV4251| HV3621 ARLINGTON CEMETERY LEE MANSION      APPROX. 2.6 KM 2703539.5 |
 HV4251| HV4279 F B 1913                            486.032 METERS 3113207.6 |
 HV4251|---------------------------------------------------------------------|
 HV4251
 HV4251                          SUPERSEDED SURVEY CONTROL
 HV4251
 HV4251  NAD 83(1991)-  38 52 51.36359(N)    077 02 34.32201(W) AD(       ) 3
 HV4251  NAD 83(1986)-  38 52 51.36325(N)    077 02 34.33258(W) AD(       ) 3
 HV4251  NAD 27      -  38 52 50.96200(N)    077 02 35.41000(W) AD(       ) 3
 HV4251  NGVD 29 (07/19/86)    2.0    (m)            7.     (f) VERT ANG       
 HV4251
 HV4251.Superseded values are not recommended for survey control.
 HV4251
 HV4251.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4251.See file dsdata.pdf to determine how the superseded data were derived.
 HV4251
 HV4251_MARKER: DE = TRAVERSE STATION DISK
 HV4251_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV4251_STAMPING: MOTOR 1935
 HV4251_MARK LOGO: CGS
 HV4251_PROJECTION: RECESSED 30 CENTIMETERS
 HV4251
 HV4251  HISTORY     - Date     Condition        Report By
 HV4251  HISTORY     - 1935     MONUMENTED       CGS
 HV4251  HISTORY     - 1946     GOOD             CGS
 HV4251  HISTORY     - 1980     GOOD             NGS
 HV4251  HISTORY     - 20120429 GOOD             PROFLN
 HV4251  HISTORY     - 20141106 GOOD             PROFLN
 HV4251
 HV4251                          STATION DESCRIPTION
 HV4251
 HV4251'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (LOC)
 HV4251'THIS TRAVERSE STATION IS A STANDARD BRONZE DISK STAMPED MOTOR 1935,
 HV4251'SET IN THE TOP OF A CONCRETE MONUMENT, 8 INCHES IN DIAMETER AT
 HV4251'THE TOP, 12 INCHES SQUARE AT THE BOTTOM, AND 32 INCHES DEEP WITH
 HV4251'THE MARK 2-1/2 INCHES BELOW THE GROUND LEVEL, IN THE LAWN 28.3
 HV4251'FEET SW OF THE CENTER LINE OF THE SW GUTTER OF THE DRIVE ALONG
 HV4251'THE SW SIDE OF THE POLO FIELD IN WEST POTOMAC PARK, 30.3 FEET NE
 HV4251'OF THE WATER FACE OF THE SEA WALL, 57.1 FEET S OF PARK LAMP
 HV4251'POST NO. 369, 63.0 FEET SW OF A SEWER CATCH BASIN IN THE SW
 HV4251'GUTTER OF THE DRIVE, AND 76.8 FEET NW OF A WATER PIPE FOR HOSE
 HV4251'CONNECTION PROTRUDING ABOUT 1 FOOT ABOVE THE GROUND LEVEL.
 HV4251'THIS MARK IS THE 1/8 MILE MARK FOR THE 1 MILE SPEEDBOAT RACE
 HV4251'COURSE WITH THE ZERO AT GATE.
 HV4251'
 HV4251'REFERENCE MARK NO. 1 A STANDARD BRONZE REFERENCE DISK STAMPED
 HV4251'NO. 1 1935 SET IN THE TOP OF THE SEA WALL IN A MASS OF CONCRETE
 HV4251'USED TO FILL IN BETWEEN THE GRANITE STONES OF THE SEA WALL ALONG
 HV4251'WEST POTOMAC PARK ABOUT 1/8 MILE NW OF THE INLET GATE BRIDGE OF
 HV4251'THE TIDAL BASIN, 2.4 FEET IN FROM THE WATER FACE OF THE SEA WALL
 HV4251'AND 0.8 FOOT FROM THE LAND SIDE.  IT IS SET ON THE LINE BETWEEN
 HV4251'MOTOR AND PRESIDENTS.
 HV4251'
 HV4251'NOTE--DISTANCES ARE MEASURED ON THE GROUND OR SLOPE AS THE CASE
 HV4251'MAY BE.
 HV4251
 HV4251                          STATION RECOVERY (1946)
 HV4251
 HV4251'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4251'SW OF SEWER SHOULD READ NW OF SEWER.  OTHERWISE, RECOVERED AS
 HV4251'DESCRIBED AND FOUND TO BE IN GOOD CONDITION.  DESCRIPTION IS
 HV4251'ADEQUATE.
 HV4251
 HV4251                          STATION RECOVERY (1980)
 HV4251
 HV4251'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1980 (BMP)
 HV4251'THE STATION IS IN WASHINGTON D.C. ALONG THE DISTRICT OR EAST SIDE
 HV4251'OF THE POTOMAC RIVER IN WEST POTOMAC PARK.
 HV4251'
 HV4251'TO REACH THE STATION FROM THE LINCOLN MEMORIAL GO SOUTH TO THE
 HV4251'ERICSSON STATUE WHICH IS ON A SMALL TRAFFIC CIRCLE, THEN
 HV4251'SOUTH ALONG THE RIVER ON RIVERSIDE DRIVE 0.98 KM (0.61 MI) TO
 HV4251'THE STATION ON THE RIGHT.
 HV4251'
 HV4251'THE STATION IS A STANDARD BRASS TRAVERSE DISK
 HV4251'STAMPED---MOTOR 1935---, SET IN A ROUND CONCRETE MONUMENT
 HV4251'10 CM BELOW GROUND LEVEL. IT IS IN THE LAWN, 11.5 METERS (37.7 FT)
 HV4251'SOUTHWEST OF THE LAST METAL CATCH BASIN ON THE WEST SIDE OF THE
 HV4251'DRIVE BEFORE THE CURVE LEADING TO THE GATE BRIDGE, 10.8 METERS
 HV4251'(35.4 FT) SOUTH OF A 25 CM ELM TREE, APPROXIMATELY 9.1 METERS
 HV4251'(29.9 FT) EAST AND A METER ABOVE THE RIVER SEA WALL, 2.0 METERS
 HV4251'(6.6 FT) WEST OF THE WEST EDGE OF AN ASPHALT PATH
 HV4251'PARALLEL TO THE ROAD.
 HV4251'A TRAVERSE CONNECTION WAS MADE TO STATION TIDAL USE NO 691 1932
 HV4251'AT THIS TIME.
 HV4251
 HV4251                          STATION RECOVERY (2012)
 HV4251
 HV4251'RECOVERY NOTE BY PROFESSIONAL LAND SURVEYOR 2012 (JRO)
 HV4251'THE MARK IS ABOUT 0.55 MI (0.9 KM) SOUTHEAST ALONG OHIO DRIVE FROM THE
 HV4251'STATUE OF JOHN ERICSSON IN WEST POTOMAC PARK, ABOUT 200 FT (61.0 M)
 HV4251'NORTHWEST ALONG SAME FROM THE POINT WHERE OHIO DRIVE STARTS TO CURVE
 HV4251'LEFT (EAST) TO PASS OVER THE BRIDGE OVER THE TIDAL INLET.  IT IS IN AN
 HV4251'OPEN GRASSY AREA ON THE RIVER SIDE OF THE ASPHALT SIDEWALK.  THE
 HV4251'ORIENTATION OF THE SIDEWALK AND DRIVE IS SE-NW, AZIMUTH 130-310 TRUE.
 HV4251'NO PERMISSION IS KNOWN TO BE NEEDED TO USE THE MARK, OTHER THAN PAYING
 HV4251'ATTENTION TO PARKING RESTRICTIONS.  NATIONAL PARK POLICE AT 1100 OHIO
 HV4251'DRIVE CAN BE CONTACTED ON 202-610-7505 IN CASE OF ANY SUCH QUESTIONS.
 HV4251'
 HV4251'THE MARK IS 37.0 FT (11.3 M) SE (AZ 165) FROM A 14 INCH (36 CM) TREE,
 HV4251'28.2 FT (8.6 M) SW (AZ 220) TOWARD RIVER FROM THE FACE OF GRANITE
 HV4251'CURB, 27.0 FT (8.2 M) SW (AZ 220) FROM A STREETLIGHT, 31.5 FT (9.6 M)
 HV4251'WSW (AZ 250) FROM THE MOST SOUTHEAST OF THREE MANHOLES IN A STORM
 HV4251'DRAINAGE STRUCTURE, 35.5 FT (10.8 M) WEST (AZ 275) FROM A 2 INCH (5
 HV4251'CM) SAPLING, 2 FT (0.6 M) BELOW THE SIDEWALK AND 1 FT (0.3 M) BELOW
 HV4251'GROUND.
 HV4251
 HV4251                          STATION RECOVERY (2014)
 HV4251
 HV4251'RECOVERY NOTE BY PROFESSIONAL LAND SURVEYOR 2014 (JRO)
 HV4251'A 12 INCH (30 CM) BY 18 INCH PLASTIC VALVE BOX WITH GREEN LID WAS PUT
 HV4251'AROUND THE MARK TODAY IN COOPERATION WITH THE NATIONAL PARK SERVICE.
 HV4251'NEW PHOTOS WERE TAKEN TO SHOW THE BOX.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4275 ***********************************************************************
 HV4275  DESIGNATION -  MULTIPLICITY
 HV4275  PID         -  HV4275
 HV4275  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4275  COUNTRY     -  US
 HV4275  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4275
 HV4275                         *CURRENT SURVEY CONTROL
 HV4275  ______________________________________________________________________
 HV4275* NAD 83(1993) POSITION- 38 56 18.97059(N) 077 01 20.39076(W)   ADJUSTED
 HV4275  ______________________________________________________________________
 HV4275  GEOID HEIGHT    -        -32.020 (meters)                     GEOID18
 HV4275  LAPLACE CORR    -         -2.10  (seconds)                    DEFLEC18
 HV4275  HORZ ORDER      -  THIRD
 HV4275
 HV4275.The horizontal coordinates were established by classical geodetic methods
 HV4275.and adjusted by the National Geodetic Survey in November 1994.
 HV4275
 HV4275.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4275.GEOID18 height accuracy estimate available here.
 HV4275
 HV4275.Click photographs - Photos may exist for this station.
 HV4275
 HV4275.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4275
 HV4275. The following values were computed from the NAD 83(1993) position.
 HV4275
 HV4275;                    North         East     Units Scale Factor Converg.
 HV4275;SPC MD       -   141,190.789   398,063.991   MT  0.99995045   -0 00 50.5
 HV4275;SPC MD       -   463,223.45  1,305,981.61   sFT  0.99995045   -0 00 50.5
 HV4275;SPC VA N     - 2,142,216.483 3,628,105.587   MT  0.99996405   +0 55 20.1
 HV4275;SPC VA N     - 7,028,255.24 11,903,209.75   sFT  0.99996405   +0 55 20.1
 HV4275;UTM  18      - 4,311,907.872   324,723.865   MT  0.99997831   -1 16 16.8
 HV4275
 HV4275_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2472311907(NAD 83)
 HV4275
 HV4275                          SUPERSEDED SURVEY CONTROL
 HV4275
 HV4275  NAD 83(1991)-  38 56 18.96980(N)    077 01 20.39163(W) AD(       ) 3
 HV4275  NAD 83(1986)-  38 56 18.96919(N)    077 01 20.40195(W) AD(       ) 3
 HV4275  NAD 27      -  38 56 18.57600(N)    077 01 21.47000(W) AD(       ) 3
 HV4275
 HV4275.Superseded values are not recommended for survey control.
 HV4275
 HV4275.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4275.See file dsdata.pdf to determine how the superseded data were derived.
 HV4275
 HV4275_MARKER: 90 = CHURCH SPIRE
 HV4275
 HV4275  HISTORY     - Date     Condition        Report By
 HV4275  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4275  HISTORY     - 1971     GOOD             NGS
 HV4275  HISTORY     - 19950623 GOOD             USPSQD
 HV4275  HISTORY     - 20201028 GOOD             NGS
 HV4275
 HV4275                          STATION DESCRIPTION
 HV4275
 HV4275'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4275'STATION IS THE SPIRE ON THE NORTHERNMOST CORNER OF THE SQUARE
 HV4275'TOWER ON THE WALLACE MEMORIAL UNITED PRESBYTERIAN CHURCH, LOCATED
 HV4275'AT THE SOUTHEAST CORNER OF THE INTERSECTION OF RANDOLPH ST.
 HV4275'AND NEW HAMPSHIRE AVE., N.W.
 HV4275
 HV4275                          STATION RECOVERY (1971)
 HV4275
 HV4275'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4275'STATION WAS RECOVERED.  THE CHURCH IS NOW THE FIRST BAPTIST
 HV4275'CHURCH. THERE ARE 8 SPRIES, ALL OF ABOUT THE SAME HEIGHT
 HV4275'(6 FEET), ON THE TOP OF THE SQUARE TOWER OF THE CHURCH.  ONE
 HV4275'SPIRE IS ON EACH CORNER OF THE TOWER, AND 1 IS AT THE CENTER OF
 HV4275'EACH SIDE OF THE TOWER.
 HV4275'
 HV4275'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DISTRICT
 HV4275'OF COLUMBIA.
 HV4275
 HV4275                          STATION RECOVERY (1995)
 HV4275
 HV4275'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4275'RECOVERED IN GOOD CONDITION.
 HV4275
 HV4275                          STATION RECOVERY (2020)
 HV4275
 HV4275'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JKH)
 HV4275'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1234 ***********************************************************************
 HV1234  DESIGNATION -  N
 HV1234  PID         -  HV1234
 HV1234  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1234  COUNTRY     -  US
 HV1234  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1234
 HV1234                         *CURRENT SURVEY CONTROL
 HV1234  ______________________________________________________________________
 HV1234* NAD 83(1986) POSITION- 38 54 07.     (N) 076 56 36.     (W)   SCALED
 HV1234* NAVD 88 ORTHO HEIGHT -     6.231 (meters)       20.44  (feet) ADJUSTED
 HV1234  ______________________________________________________________________
 HV1234  GEOID HEIGHT    -        -32.238 (meters)                     GEOID18
 HV1234  DYNAMIC HEIGHT  -          6.227 (meters)       20.43  (feet) COMP
 HV1234  MODELED GRAVITY -    980,092.6   (mgal)                       NAVD 88
 HV1234
 HV1234  VERT ORDER      -  FIRST     CLASS II
 HV1234
 HV1234.The horizontal coordinates were scaled from a map and have
 HV1234.an estimated accuracy of +/- 6 seconds.
 HV1234
 HV1234.The orthometric height was determined by differential leveling and
 HV1234.adjusted by the NATIONAL GEODETIC SURVEY
 HV1234.in June 1991.
 HV1234
 HV1234.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1234.GEOID18 height accuracy estimate available here.
 HV1234
 HV1234.Click photographs - Photos may exist for this station.
 HV1234
 HV1234.The dynamic height is computed by dividing the NAVD 88
 HV1234.geopotential number by the normal gravity value computed on the
 HV1234.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1234.degrees latitude (g = 980.6199 gals.).
 HV1234
 HV1234.The modeled gravity was interpolated from observed gravity values.
 HV1234
 HV1234
 HV1234_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ314076(NAD 83)
 HV1234
 HV1234                          SUPERSEDED SURVEY CONTROL
 HV1234
 HV1234  NGVD 29 (11/26/84)    6.468  (m)           21.22   (f) ADJUSTED    1 2
 HV1234
 HV1234.Superseded values are not recommended for survey control.
 HV1234
 HV1234.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1234.See file dsdata.pdf to determine how the superseded data were derived.
 HV1234
 HV1234_MARKER: DB = BENCH MARK DISK
 HV1234_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1234_SP_SET: BRIDGE
 HV1234_STAMPING: N 1917
 HV1234_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1234
 HV1234  HISTORY     - Date     Condition        Report By
 HV1234  HISTORY     - 1917     MONUMENTED       CGS
 HV1234  HISTORY     - 1929     GOOD             CGS
 HV1234  HISTORY     - 1960     GOOD             CGS
 HV1234
 HV1234                          STATION DESCRIPTION
 HV1234
 HV1234'DESCRIBED BY COAST AND GEODETIC SURVEY 1929
 HV1234'AT WASHINGTON.
 HV1234'AT WASHINGTON, ON KENILWORTH AVENUE NORTHEAST, AT THE INTERSECTION
 HV1234'OF DEANE AVENUE, AT THE POINT WHERE THE PENNSYLVANIA RAILROAD
 HV1234'CROSSES THE TRACKS OF THE CAPITOL TRANSIT CO. (AN OVERHEAD
 HV1234'BRIDGE), AT THE SOUTHWEST ABUTMENT OF THE BRIDGE, ON THE
 HV1234'NORTHWEST WING WALL, AND IN THE TOP OF THE NORTH END OF THE
 HV1234'SECOND COURSE OF STONE FROM THE BOTTOM.  A STANDARD DISK,
 HV1234'STAMPED N 1917.
 HV1234
 HV1234                          STATION RECOVERY (1960)
 HV1234
 HV1234'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1234'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2034 ***********************************************************************
 HV2034  DESIGNATION -  N 2
 HV2034  PID         -  HV2034
 HV2034  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2034  COUNTRY     -  US
 HV2034  USGS QUAD   -  ALEXANDRIA (2019)
 HV2034
 HV2034                         *CURRENT SURVEY CONTROL
 HV2034  ______________________________________________________________________
 HV2034* NAD 83(1986) POSITION- 38 51 20.     (N) 077 00 57.     (W)   SCALED
 HV2034* NAVD 88 ORTHO HEIGHT -     2.419 (meters)        7.94  (feet) ADJUSTED
 HV2034  ______________________________________________________________________
 HV2034  GEOID HEIGHT    -        -32.179 (meters)                     GEOID18
 HV2034  DYNAMIC HEIGHT  -          2.417 (meters)        7.93  (feet) COMP
 HV2034  MODELED GRAVITY -    980,093.9   (mgal)                       NAVD 88
 HV2034
 HV2034  VERT ORDER      -  FIRST     CLASS II
 HV2034
 HV2034.The horizontal coordinates were scaled from a map and have
 HV2034.an estimated accuracy of +/- 6 seconds.
 HV2034
 HV2034.The orthometric height was determined by differential leveling and
 HV2034.adjusted by the NATIONAL GEODETIC SURVEY
 HV2034.in June 1991.
 HV2034
 HV2034.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2034.GEOID18 height accuracy estimate available here.
 HV2034
 HV2034.Click photographs - Photos may exist for this station.
 HV2034
 HV2034.The dynamic height is computed by dividing the NAVD 88
 HV2034.geopotential number by the normal gravity value computed on the
 HV2034.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2034.degrees latitude (g = 980.6199 gals.).
 HV2034
 HV2034.The modeled gravity was interpolated from observed gravity values.
 HV2034
 HV2034
 HV2034_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ250026(NAD 83)
 HV2034
 HV2034                          SUPERSEDED SURVEY CONTROL
 HV2034
 HV2034  NGVD 29 (11/26/84)    2.679  (m)            8.79   (f) ADJUSTED    1 2
 HV2034
 HV2034.Superseded values are not recommended for survey control.
 HV2034
 HV2034.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2034.See file dsdata.pdf to determine how the superseded data were derived.
 HV2034
 HV2034_MARKER: DB = BENCH MARK DISK
 HV2034_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV2034_SP_SET: PLATFORM
 HV2034_STAMPING: N 2 1944
 HV2034_MARK LOGO: CGS
 HV2034_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2034
 HV2034  HISTORY     - Date     Condition        Report By
 HV2034  HISTORY     - 1944     MONUMENTED       CGS
 HV2034
 HV2034                          STATION DESCRIPTION
 HV2034
 HV2034'DESCRIBED BY COAST AND GEODETIC SURVEY 1944
 HV2034'IN WASHINGTON.
 HV2034'IN SOUTHEAST WASHINGTON, AT THE NAVAL AIR STATION, AT THE
 HV2034'EAST CORNER OF BUILDING 94, IN THE TOP OF THE SOUTHEAST CONCRETE
 HV2034'PLATFORM, 12 INCHES NORTHEAST OF THE NORTHEAST FACE OF THE
 HV2034'BUILDING, AND 14 INCHES NORTHWEST OF THE SOUTHEAST EDGE OF THE
 HV2034'PLATFORM.  A STANDARD DISK, STAMPED N 2 1944.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1465 ***********************************************************************
 HV1465  DESIGNATION -  N 4 DCDHT
 HV1465  PID         -  HV1465
 HV1465  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1465  COUNTRY     -  US
 HV1465  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1465
 HV1465                         *CURRENT SURVEY CONTROL
 HV1465  ______________________________________________________________________
 HV1465* NAD 83(1986) POSITION- 38 53 11.     (N) 076 57 45.     (W)   SCALED
 HV1465* NAVD 88 ORTHO HEIGHT -    11.172 (meters)       36.65  (feet) ADJUSTED
 HV1465  ______________________________________________________________________
 HV1465  GEOID HEIGHT    -        -32.222 (meters)                     GEOID18
 HV1465  DYNAMIC HEIGHT  -         11.166 (meters)       36.63  (feet) COMP
 HV1465  MODELED GRAVITY -    980,093.0   (mgal)                       NAVD 88
 HV1465
 HV1465  VERT ORDER      -  SECOND    CLASS 0
 HV1465
 HV1465.The horizontal coordinates were scaled from a map and have
 HV1465.an estimated accuracy of +/- 6 seconds.
 HV1465
 HV1465.The orthometric height was determined by differential leveling and
 HV1465.adjusted by the NATIONAL GEODETIC SURVEY
 HV1465.in June 1991.
 HV1465
 HV1465.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1465.GEOID18 height accuracy estimate available here.
 HV1465
 HV1465.Click photographs - Photos may exist for this station.
 HV1465
 HV1465.The dynamic height is computed by dividing the NAVD 88
 HV1465.geopotential number by the normal gravity value computed on the
 HV1465.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1465.degrees latitude (g = 980.6199 gals.).
 HV1465
 HV1465.The modeled gravity was interpolated from observed gravity values.
 HV1465
 HV1465
 HV1465_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ297059(NAD 83)
 HV1465
 HV1465                          SUPERSEDED SURVEY CONTROL
 HV1465
 HV1465  NGVD 29 (11/26/84)   11.409  (m)           37.43   (f) ADJUSTED    2 0
 HV1465
 HV1465.Superseded values are not recommended for survey control.
 HV1465
 HV1465.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1465.See file dsdata.pdf to determine how the superseded data were derived.
 HV1465
 HV1465_MARKER: DD = SURVEY DISK
 HV1465_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1465_SP_SET: WALK
 HV1465_STAMPING: N 4 1961
 HV1465_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1465
 HV1465  HISTORY     - Date     Condition        Report By
 HV1465  HISTORY     - 1961     MONUMENTED       DCDHT
 HV1465
 HV1465                          STATION DESCRIPTION
 HV1465
 HV1465'DESCRIBED BY DC DEPARTMENT OF HIGHWAYS AND TRAFFIC 1961
 HV1465'IN WASHINGTON DC.
 HV1465'IN SE WASHINGTON, D.C., IN ANACOSTIA PARK, AT THE E CONRER OF
 HV1465'BRIDGE 505, WHICH CARRIES THE ANACOSTIA FREEWAY OVER THE P.R.R.
 HV1465'FREIGHT YARDS, IN THE WALK, 0.9 FEET SE OF THE CURB AND 3 FEET
 HV1465'SW OF THE SW EDGE OF THE NE ABUTMENT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1856 ***********************************************************************
 HV1856  DESIGNATION -  N 5
 HV1856  PID         -  HV1856
 HV1856  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1856  COUNTRY     -  US
 HV1856  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1856
 HV1856                         *CURRENT SURVEY CONTROL
 HV1856  ______________________________________________________________________
 HV1856* NAD 83(1986) POSITION- 38 53 35.     (N) 077 03 19.     (W)   SCALED
 HV1856* NAVD 88 ORTHO HEIGHT -     3.625 (meters)       11.89  (feet) ADJUSTED
 HV1856  ______________________________________________________________________
 HV1856  GEOID HEIGHT    -        -32.056 (meters)                     GEOID18
 HV1856  DYNAMIC HEIGHT  -          3.623 (meters)       11.89  (feet) COMP
 HV1856  MODELED GRAVITY -    980,094.8   (mgal)                       NAVD 88
 HV1856
 HV1856  VERT ORDER      -  FIRST     CLASS I
 HV1856
 HV1856.The horizontal coordinates were scaled from a map and have
 HV1856.an estimated accuracy of +/- 6 seconds.
 HV1856
 HV1856.The orthometric height was determined by differential leveling and
 HV1856.adjusted by the NATIONAL GEODETIC SURVEY
 HV1856.in June 1991.
 HV1856
 HV1856.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1856.GEOID18 height accuracy estimate available here.
 HV1856
 HV1856.Click photographs - Photos may exist for this station.
 HV1856
 HV1856.The dynamic height is computed by dividing the NAVD 88
 HV1856.geopotential number by the normal gravity value computed on the
 HV1856.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1856.degrees latitude (g = 980.6199 gals.).
 HV1856
 HV1856.The modeled gravity was interpolated from observed gravity values.
 HV1856
 HV1856
 HV1856_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ217069(NAD 83)
 HV1856
 HV1856                          SUPERSEDED SURVEY CONTROL
 HV1856
 HV1856  NGVD 29 (11/26/84)    3.861  (m)           12.67   (f) ADJUSTED    1 1
 HV1856
 HV1856.Superseded values are not recommended for survey control.
 HV1856
 HV1856.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1856.See file dsdata.pdf to determine how the superseded data were derived.
 HV1856
 HV1856_MARKER: DB = BENCH MARK DISK
 HV1856_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1856_SP_SET: GRANITE DOORSTEP
 HV1856_STAMPING: N 5 1971
 HV1856_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1856_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1856+SATELLITE: SATELLITE OBSERVATIONS - November 13, 2009
 HV1856
 HV1856  HISTORY     - Date     Condition        Report By
 HV1856  HISTORY     - 1971     MONUMENTED       NGS
 HV1856  HISTORY     - 1974     GOOD             NGS
 HV1856  HISTORY     - 20091113 GOOD             GEOCAC
 HV1856
 HV1856                          STATION DESCRIPTION
 HV1856
 HV1856'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1856'AT WASHINGTON.
 HV1856'AT WASHINGTON, D.C., ABOUT 0.6 MILE NORTHWEST ALONG ROCK CREEK
 HV1856'PARKWAY FROM THE LINCOLN MEMORIAL, 0.15 MILE SOUTHEAST OF THE
 HV1856'JOHN F. KENNEDY CENTER, AT THE THEODORE ROOSEVELT BRIDGE
 HV1856'(INTERSTATE HIGHWAY 66) WHICH FORMS THE OVERPASS FOR ROCK CREEK
 HV1856'PARKWAY, SET IN THE TOP OF THE CENTER OF A GRANITE DOORSTEP AT
 HV1856'A METAL DOOR IN THE NORTHEAST WALL OF THE OVERPASS, 13 1/2 FEET
 HV1856'NORTHEAST OF THE CENTER LINE OF THE NORTHEAST LANES OF THE
 HV1856'PARKWAY, 2.8 FEET NORTHEAST OF THE NORTHEAST SIDE OF THE
 HV1856'NORTHEAST CURB, AND ABOUT 1 FOOT ABOVE THE LEVEL OF THE PARKWAY.
 HV1856'NOTE-- THE STEP IS ALSO THE FOUNDATION FOR THE WALL OF THE
 HV1856'OVERPASS.
 HV1856
 HV1856                          STATION RECOVERY (1974)
 HV1856
 HV1856'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974
 HV1856'RECOVERED IN GOOD CONDITION.
 HV1856
 HV1856                          STATION RECOVERY (2009)
 HV1856
 HV1856'RECOVERY NOTE BY GEOCACHING 2009 (GAH)
 HV1856'DISK AND SETTING INTACT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4072 ***********************************************************************
 HV4072  DESIGNATION -  N DC CORNER ECC
 HV4072  PID         -  HV4072
 HV4072  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4072  COUNTRY     -  US
 HV4072  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4072
 HV4072                         *CURRENT SURVEY CONTROL
 HV4072  ______________________________________________________________________
 HV4072* NAD 83(1993) POSITION- 38 59 40.33056(N) 077 02 20.53957(W)   ADJUSTED
 HV4072* NAVD 88 ORTHO HEIGHT -   102.    (meters)      335.    (feet) SCALED
 HV4072  ______________________________________________________________________
 HV4072  GEOID HEIGHT    -        -31.954 (meters)                     GEOID18
 HV4072  LAPLACE CORR    -         -2.63  (seconds)                    DEFLEC18
 HV4072  HORZ ORDER      -  FIRST
 HV4072
 HV4072.The horizontal coordinates were established by classical geodetic methods
 HV4072.and adjusted by the National Geodetic Survey in November 1994.
 HV4072
 HV4072.The orthometric height was scaled from a topographic map.
 HV4072
 HV4072.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4072.GEOID18 height accuracy estimate available here.
 HV4072
 HV4072.Click photographs - Photos may exist for this station.
 HV4072
 HV4072.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4072
 HV4072. The following values were computed from the NAD 83(1993) position.
 HV4072
 HV4072;                    North         East     Units Scale Factor Converg.
 HV4072;SPC MD       -   147,400.402   396,618.114   MT  0.99995199   -0 01 28.2
 HV4072;SPC MD       -   483,596.15  1,301,237.93   sFT  0.99995199   -0 01 28.2
 HV4072;SPC VA N     - 2,148,401.738 3,626,558.410   MT  0.99996999   +0 54 42.5
 HV4072;SPC VA N     - 7,048,548.04 11,898,133.72   sFT  0.99996999   +0 54 42.5
 HV4072;UTM  18      - 4,318,147.921   323,414.637   MT  0.99998398   -1 17 00.2
 HV4072
 HV4072!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4072!SPC MD       -   0.99998904  x   0.99995199  =   0.99994103
 HV4072!SPC VA N     -   0.99998904  x   0.99996999  =   0.99995903
 HV4072!UTM  18      -   0.99998904  x   0.99998398  =   0.99997302
 HV4072
 HV4072:                Primary Azimuth Mark                     Grid Az
 HV4072:SPC MD       -  N DC CORNER ECC AZ MK                    094 23 38.1
 HV4072:SPC VA N     -  N DC CORNER ECC AZ MK                    093 27 27.4
 HV4072:UTM  18      -  N DC CORNER ECC AZ MK                    095 39 10.1
 HV4072
 HV4072_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2341418147(NAD 83)
 HV4072
 HV4072|---------------------------------------------------------------------|
 HV4072| PID    Reference Object                     Distance      Geod. Az  |
 HV4072|                                                           dddmmss.s |
 HV4072| HV4296 N DC COR ECC 1934 RM 1               94.571 METERS 02725     |
 HV4072| DC6928 N DC CORNER ECC AZ MK                              0942209.9 |
 HV4072| HV4631 ALEXANDRIA WASH MASON MEMORIAL      APPROX.20.9 KM 1862505.3 |
 HV4072| HV4584 GROVETON AIRWAY BEACON              APPROX.24.9 KM 1884853.0 |
 HV4072| JV4278 ALTA VISTA WHITE STANDPIPE          APPROX. 6.2 KM 2805221.9 |
 HV4072| DC6929 N DC CORNER ECC RM 2                 43.070 METERS 32411     |
 HV4072|---------------------------------------------------------------------|
 HV4072
 HV4072                          SUPERSEDED SURVEY CONTROL
 HV4072
 HV4072  NAD 83(1991)-  38 59 40.32989(N)    077 02 20.54030(W) AD(       ) 1
 HV4072  NAD 83(1986)-  38 59 40.32908(N)    077 02 20.55031(W) AD(       ) 1
 HV4072  NAD 27      -  38 59 39.93300(N)    077 02 21.63100(W) AD(       ) 1
 HV4072
 HV4072.Superseded values are not recommended for survey control.
 HV4072
 HV4072.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4072.See file dsdata.pdf to determine how the superseded data were derived.
 HV4072
 HV4072_MARKER: Z = SEE DESCRIPTION
 HV4072_SETTING: 0 = UNSPECIFIED SETTING
 HV4072
 HV4072  HISTORY     - Date     Condition        Report By
 HV4072  HISTORY     - 1934     MONUMENTED       PBPP
 HV4072
 HV4072                          STATION DESCRIPTION
 HV4072
 HV4072'DESCRIBED BY PUB BLDGS AND PARKS 1934 (JB)
 HV4072'THIS STATION IS LOCATED OVER A TRIANGULATION STATION OF THE
 HV4072'P.B. AND P.P. SURVEY.  IT IS IN THE N CORNER OF THE DISTRICT
 HV4072'OF COLUMBIA.  THE STATION IS NOT LOCATED OVER THE CORNER
 HV4072'MONUMENT, BUT IS ON THE HIGHER GROUND TO THE SE.  IT IS IN
 HV4072'A CLEARED SPACE, JUST N OF A PATH THAT RUNS THROUGH THE LOT,
 HV4072'106.5 METERS SW OF THE PAVED HIGHWAY 410.  THE MARK IS 3
 HV4072'INCHES BELOW GROUND AND 7.840 METERS NE OF AN INTERMEDIATE
 HV4072'BOUNDARY STONE.  THIS STONE IS 6 INCHES SQUARE AND STANDS
 HV4072'ABOUT 8 INCHES ABOVE GROUND.  TWO NEW REFERENCE MARKS AND AN
 HV4072'AZIMUTH MARK WERE SET FOR THIS STATION.  THE STATION MARK AND
 HV4072'REFERENCE MARKS WERE STAMPED N D C CORNER ECC 1934.
 HV4072'
 HV4072'REFERENCE MARK NO. 1, A STANDARD BRONZE DISK IN A SQUARE
 HV4072'BLOCK OR POST OF CONCRETE, IS ABOUT 94.57 METERS NE OF THE
 HV4072'STATION, 12.1 METERS SW OF THE CENTER LINE OF PAVED HIGHWAY
 HV4072'410.  THE MARK PROJECTS 6 INCHES ABOVE GROUND.
 HV4072'
 HV4072'REFERENCE MARK NO. 2, A STANDARD BRONZE DISK IN A SQUARE
 HV4072'BLOCK OR POST OF CONCRETE, IS 43.070 METERS NW OF THE STATION,
 HV4072'IN A NE-SW FENCE LINE.  THE MARK PROJECTS 2 INCHES ABOVE
 HV4072'GROUND.
 HV4072'
 HV4072'THE AZIMUTH MARK IS ABOUT 0.4 MILE E OF THE STATION.  IT IS
 HV4072'SET IN THE W RAIL OF THE OVERHEAD BRIDGE OF THE BALTIMORE
 HV4072'AND OHIO RAILROAD METROPOLITAN BRANCH, AT THE POINT WHERE
 HV4072'IT CROSSES 16TH STREET EXTENSION.  SOME CLEARING WILL BE
 HV4072'NECESSARY IN ORDER TO SEE THE MARK FROM THE GROUND AT THE
 HV4072'STATION.
 HV4072'
 HV4072'STATION RENO AND THE NEW WATER TOWER AT STATION RENO ARE
 HV4072'VG IF A LITTLE CLEARING IS DONE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4159 ***********************************************************************
 HV4159  DESIGNATION -  N E 129 C 1960
 HV4159  PID         -  HV4159
 HV4159  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4159  COUNTRY     -  US
 HV4159  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4159
 HV4159                         *CURRENT SURVEY CONTROL
 HV4159  ______________________________________________________________________
 HV4159* NAD 83(1993) POSITION- 38 56 45.77455(N) 077 00 31.30842(W)   ADJUSTED
 HV4159* NAVD 88 ORTHO HEIGHT -    99.    (meters)      325.    (feet) SCALED
 HV4159  ______________________________________________________________________
 HV4159  GEOID HEIGHT    -        -32.030 (meters)                     GEOID18
 HV4159  LAPLACE CORR    -         -2.71  (seconds)                    DEFLEC18
 HV4159  HORZ ORDER      -  SECOND
 HV4159
 HV4159.The horizontal coordinates were established by classical geodetic methods
 HV4159.and adjusted by the National Geodetic Survey in November 1994.
 HV4159
 HV4159.The orthometric height was scaled from a topographic map.
 HV4159
 HV4159.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4159.GEOID18 height accuracy estimate available here.
 HV4159
 HV4159.Click photographs - Photos may exist for this station.
 HV4159
 HV4159.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4159
 HV4159. The following values were computed from the NAD 83(1993) position.
 HV4159
 HV4159;                    North         East     Units Scale Factor Converg.
 HV4159;SPC MD       -   142,017.110   399,246.094   MT  0.99995060   -0 00 19.7
 HV4159;SPC MD       -   465,934.47  1,309,859.89   sFT  0.99995060   -0 00 19.7
 HV4159;SPC VA N     - 2,143,062.020 3,629,274.046   MT  0.99996479   +0 55 50.7
 HV4159;SPC VA N     - 7,031,029.31 11,907,043.27   sFT  0.99996479   +0 55 50.7
 HV4159;UTM  18      - 4,312,708.074   325,923.847   MT  0.99997314   -1 15 46.7
 HV4159
 HV4159!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4159!SPC MD       -   0.99998953  x   0.99995060  =   0.99994013
 HV4159!SPC VA N     -   0.99998953  x   0.99996479  =   0.99995432
 HV4159!UTM  18      -   0.99998953  x   0.99997314  =   0.99996267
 HV4159
 HV4159_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2592312708(NAD 83)
 HV4159
 HV4159|---------------------------------------------------------------------|
 HV4159| PID    Reference Object                     Distance      Geod. Az  |
 HV4159|                                                           dddmmss.s |
 HV4159| HV4161 N W 129 D 1960                      191.181 METERS 15239     |
 HV4159| HV4157 N W 129 B 1960                      363.330 METERS 35716     |
 HV4159|---------------------------------------------------------------------|
 HV4159
 HV4159                          SUPERSEDED SURVEY CONTROL
 HV4159
 HV4159  NAD 83(1991)-  38 56 45.77353(N)    077 00 31.30941(W) AD(       ) 2
 HV4159  NAD 83(1986)-  38 56 45.77279(N)    077 00 31.31947(W) AD(       ) 2
 HV4159  NAD 27      -  38 56 45.37840(N)    077 00 32.39970(W) AD(       ) 2
 HV4159
 HV4159.Superseded values are not recommended for survey control.
 HV4159
 HV4159.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4159.See file dsdata.pdf to determine how the superseded data were derived.
 HV4159
 HV4159_MARKER: Z = SEE DESCRIPTION
 HV4159_SETTING: 0 = UNSPECIFIED SETTING
 HV4159_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4159
 HV4159  HISTORY     - Date     Condition        Report By
 HV4159  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4159  HISTORY     - 1971     GOOD             NGS
 HV4159
 HV4159                          STATION DESCRIPTION
 HV4159
 HV4159'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4159'STATION AND REFERENCE POINTS RECOVERED IN GOOD CONDITION.  IT
 HV4159'IS ALSO 16.5 FEET EAST OF WHERE SIDEWALK JOINS CURB AND 1-INCH
 HV4159'NORTH OF BACK OF CURB.  NORTH CAPITOL ST. (SHOWN ON DRAWING) IS
 HV4159'NOW ROCK CREEK CHURCH RD.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4163 ***********************************************************************
 HV4163  DESIGNATION -  N E 129 E 1960
 HV4163  PID         -  HV4163
 HV4163  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4163  COUNTRY     -  US
 HV4163  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4163
 HV4163                         *CURRENT SURVEY CONTROL
 HV4163  ______________________________________________________________________
 HV4163* NAD 83(1993) POSITION- 38 57 19.29242(N) 077 00 21.74623(W)   ADJUSTED
 HV4163* NAVD 88 ORTHO HEIGHT -    72.    (meters)      236.    (feet) SCALED
 HV4163  ______________________________________________________________________
 HV4163  GEOID HEIGHT    -        -32.026 (meters)                     GEOID18
 HV4163  LAPLACE CORR    -         -2.78  (seconds)                    DEFLEC18
 HV4163  HORZ ORDER      -  SECOND
 HV4163
 HV4163.The horizontal coordinates were established by classical geodetic methods
 HV4163.and adjusted by the National Geodetic Survey in November 1994.
 HV4163
 HV4163.The orthometric height was scaled from a topographic map.
 HV4163
 HV4163.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4163.GEOID18 height accuracy estimate available here.
 HV4163
 HV4163.Click photographs - Photos may exist for this station.
 HV4163
 HV4163.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4163
 HV4163. The following values were computed from the NAD 83(1993) position.
 HV4163
 HV4163;                    North         East     Units Scale Factor Converg.
 HV4163;SPC MD       -   143,050.644   399,476.420   MT  0.99995081   -0 00 13.6
 HV4163;SPC MD       -   469,325.32  1,310,615.55   sFT  0.99995081   -0 00 13.6
 HV4163;SPC VA N     - 2,144,099.194 3,629,487.457   MT  0.99996573   +0 55 56.7
 HV4163;SPC VA N     - 7,034,432.11 11,907,743.43   sFT  0.99996573   +0 55 56.7
 HV4163;UTM  18      - 4,313,736.326   326,176.806   MT  0.99997206   -1 15 41.6
 HV4163
 HV4163!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4163!SPC MD       -   0.99999376  x   0.99995081  =   0.99994457
 HV4163!SPC VA N     -   0.99999376  x   0.99996573  =   0.99995949
 HV4163!UTM  18      -   0.99999376  x   0.99997206  =   0.99996582
 HV4163
 HV4163_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2617613736(NAD 83)
 HV4163
 HV4163|---------------------------------------------------------------------|
 HV4163| PID    Reference Object                     Distance      Geod. Az  |
 HV4163|                                                           dddmmss.s |
 HV4163| HV2180 NE 129 F MADHOP                     384.810 METERS 07313     |
 HV4163| HV2178 NW 129                              284.018 METERS 25414     |
 HV4163|---------------------------------------------------------------------|
 HV4163
 HV4163                          SUPERSEDED SURVEY CONTROL
 HV4163
 HV4163  NAD 83(1991)-  38 57 19.29141(N)    077 00 21.74717(W) AD(       ) 2
 HV4163  NAD 83(1986)-  38 57 19.29061(N)    077 00 21.75709(W) AD(       ) 2
 HV4163  NAD 27      -  38 57 18.89850(N)    077 00 22.83490(W) AD(       ) 2
 HV4163
 HV4163.Superseded values are not recommended for survey control.
 HV4163
 HV4163.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4163.See file dsdata.pdf to determine how the superseded data were derived.
 HV4163
 HV4163_MARKER: Z = SEE DESCRIPTION
 HV4163_SETTING: 0 = UNSPECIFIED SETTING
 HV4163_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4163
 HV4163  HISTORY     - Date     Condition        Report By
 HV4163  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4163  HISTORY     - 1966     GOOD             LOCENG
 HV4163  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4163
 HV4163                          STATION DESCRIPTION
 HV4163
 HV4163'DESCRIBED BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (WST)
 HV4163'RECOVERED BY DE LEUW CATHER CO.
 HV4163'
 HV4163'GOOD
 HV4163
 HV4163                          STATION RECOVERY (1971)
 HV4163
 HV4163'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4163'THIS STATION WAS DESTROYED WHEN NEW SIDEWALK AND DRIVEWAY WAS
 HV4163'PUT IN.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4160 ***********************************************************************
 HV4160  DESIGNATION -  N E 130 A 1960
 HV4160  PID         -  HV4160
 HV4160  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4160  COUNTRY     -  US
 HV4160  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4160
 HV4160                         *CURRENT SURVEY CONTROL
 HV4160  ______________________________________________________________________
 HV4160* NAD 83(1993) POSITION- 38 56 25.97650(N) 077 00 28.29963(W)   ADJUSTED
 HV4160* NAVD 88 ORTHO HEIGHT -    85.    (meters)      279.    (feet) SCALED
 HV4160  ______________________________________________________________________
 HV4160  GEOID HEIGHT    -        -32.036 (meters)                     GEOID18
 HV4160  LAPLACE CORR    -         -2.84  (seconds)                    DEFLEC18
 HV4160  HORZ ORDER      -  SECOND
 HV4160
 HV4160.The horizontal coordinates were established by classical geodetic methods
 HV4160.and adjusted by the National Geodetic Survey in November 1994.
 HV4160
 HV4160.The orthometric height was scaled from a topographic map.
 HV4160
 HV4160.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4160.GEOID18 height accuracy estimate available here.
 HV4160
 HV4160.Click photographs - Photos may exist for this station.
 HV4160
 HV4160.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4160
 HV4160. The following values were computed from the NAD 83(1993) position.
 HV4160
 HV4160;                    North         East     Units Scale Factor Converg.
 HV4160;SPC MD       -   141,406.615   399,318.493   MT  0.99995048   -0 00 17.8
 HV4160;SPC MD       -   463,931.54  1,310,097.42   sFT  0.99995048   -0 00 17.8
 HV4160;SPC VA N     - 2,142,452.781 3,629,356.412   MT  0.99996424   +0 55 52.6
 HV4160;SPC VA N     - 7,029,030.50 11,907,313.50   sFT  0.99996424   +0 55 52.6
 HV4160;UTM  18      - 4,312,096.123   325,982.833   MT  0.99997289   -1 15 44.2
 HV4160
 HV4160!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4160!SPC MD       -   0.99999173  x   0.99995048  =   0.99994221
 HV4160!SPC VA N     -   0.99999173  x   0.99996424  =   0.99995597
 HV4160!UTM  18      -   0.99999173  x   0.99997289  =   0.99996462
 HV4160
 HV4160:                Primary Azimuth Mark                     Grid Az
 HV4160:SPC MD       -  N E 130 B ECC                            167 48 00.0
 HV4160:SPC VA N     -  N E 130 B ECC                            166 51 49.6
 HV4160:UTM  18      -  N E 130 B ECC                            169 03 26.4
 HV4160
 HV4160_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2598212096(NAD 83)
 HV4160
 HV4160|---------------------------------------------------------------------|
 HV4160| PID    Reference Object                     Distance      Geod. Az  |
 HV4160|                                                           dddmmss.s |
 HV4160| HV2179 NE 130 DCDHT                        180.482 METERS 01046     |
 HV4160| HV4533 N E 130 B ECC                       APPROX. 0.7 KM 1674742.2 |
 HV4160|---------------------------------------------------------------------|
 HV4160
 HV4160                          SUPERSEDED SURVEY CONTROL
 HV4160
 HV4160  NAD 83(1991)-  38 56 25.97548(N)    077 00 28.30063(W) AD(       ) 2
 HV4160  NAD 83(1986)-  38 56 25.97472(N)    077 00 28.31077(W) AD(       ) 2
 HV4160  NAD 27      -  38 56 25.57840(N)    077 00 29.39100(W) AD(       ) 2
 HV4160
 HV4160.Superseded values are not recommended for survey control.
 HV4160
 HV4160.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4160.See file dsdata.pdf to determine how the superseded data were derived.
 HV4160
 HV4160_MARKER: DD = SURVEY DISK
 HV4160_SETTING: 0 = UNSPECIFIED SETTING
 HV4160_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4160
 HV4160  HISTORY     - Date     Condition        Report By
 HV4160  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4160  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4160
 HV4160                          STATION DESCRIPTION
 HV4160
 HV4160'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4160'STATION PIPE WAS NOT RECOVERED.  A NEW ATHLETIC FIELD WAS
 HV4160'BUILT DURING THE PAST YEAR.  THE 2 REFERENCE POINTS WERE RECOVERED.
 HV4160'
 HV4160'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4160'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4162 ***********************************************************************
 HV4162  DESIGNATION -  N E 130 B 1960
 HV4162  PID         -  HV4162
 HV4162  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4162  COUNTRY     -  US
 HV4162  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4162
 HV4162                         *CURRENT SURVEY CONTROL
 HV4162  ______________________________________________________________________
 HV4162* NAD 83(1993) POSITION- 38 56 02.88045(N) 077 00 21.89314(W)   ADJUSTED
 HV4162* NAVD 88 ORTHO HEIGHT -    64.    (meters)      210.    (feet) SCALED
 HV4162  ______________________________________________________________________
 HV4162  GEOID HEIGHT    -        -32.046 (meters)                     GEOID18
 HV4162  LAPLACE CORR    -         -3.05  (seconds)                    DEFLEC18
 HV4162  HORZ ORDER      -  SECOND
 HV4162
 HV4162.The horizontal coordinates were established by classical geodetic methods
 HV4162.and adjusted by the National Geodetic Survey in November 1994.
 HV4162
 HV4162.The orthometric height was scaled from a topographic map.
 HV4162
 HV4162.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4162.GEOID18 height accuracy estimate available here.
 HV4162
 HV4162.Click photographs - Photos may exist for this station.
 HV4162
 HV4162.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4162
 HV4162. The following values were computed from the NAD 83(1993) position.
 HV4162
 HV4162;                    North         East     Units Scale Factor Converg.
 HV4162;SPC MD       -   140,694.418   399,472.726   MT  0.99995036   -0 00 13.7
 HV4162;SPC MD       -   461,594.94  1,310,603.44   sFT  0.99995036   -0 00 13.7
 HV4162;SPC VA N     - 2,141,743.190 3,629,522.263   MT  0.99996362   +0 55 56.6
 HV4162;SPC VA N     - 7,026,702.45 11,907,857.62   sFT  0.99996362   +0 55 56.6
 HV4162;UTM  18      - 4,311,380.698   326,121.404   MT  0.99997230   -1 15 39.6
 HV4162
 HV4162!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4162!SPC MD       -   0.99999502  x   0.99995036  =   0.99994538
 HV4162!SPC VA N     -   0.99999502  x   0.99996362  =   0.99995864
 HV4162!UTM  18      -   0.99999502  x   0.99997230  =   0.99996732
 HV4162
 HV4162_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2612111380(NAD 83)
 HV4162
 HV4162                          SUPERSEDED SURVEY CONTROL
 HV4162
 HV4162  NAD 83(1991)-  38 56 02.87942(N)    077 00 21.89417(W) AD(       ) 2
 HV4162  NAD 83(1986)-  38 56 02.87862(N)    077 00 21.90439(W) AD(       ) 2
 HV4162  NAD 27      -  38 56 02.48070(N)    077 00 22.98520(W) AD(       ) 2
 HV4162
 HV4162.Superseded values are not recommended for survey control.
 HV4162
 HV4162.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4162.See file dsdata.pdf to determine how the superseded data were derived.
 HV4162
 HV4162_MARKER: Z = SEE DESCRIPTION
 HV4162_SETTING: 0 = UNSPECIFIED SETTING
 HV4162_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4162
 HV4162  HISTORY     - Date     Condition        Report By
 HV4162  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4162  HISTORY     - 1971     GOOD             NGS
 HV4162
 HV4162                          STATION DESCRIPTION
 HV4162
 HV4162'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4162'STATION WAS RECOVERED AS DESCRIBED.  ADDITIONAL INFORMATION--IT
 HV4162'IS A CROSS CUT ON IRON RIM OF THE MOST NORTHERLY ONE OF TWO CATCH
 HV4162'BASINS IN THE MEDIAN STRIP BETWEEN AN APPROACH RAMP AND AN EXIT
 HV4162'RAMP TO AND FROM THE SOUTH BOUND TRAFFIC LANES.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4154 ***********************************************************************
 HV4154  DESIGNATION -  N E 131 A 1960
 HV4154  PID         -  HV4154
 HV4154  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4154  COUNTRY     -  US
 HV4154  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4154
 HV4154                         *CURRENT SURVEY CONTROL
 HV4154  ______________________________________________________________________
 HV4154* NAD 83(1993) POSITION- 38 55 40.16355(N) 077 00 32.06721(W)   ADJUSTED
 HV4154* NAVD 88 ORTHO HEIGHT -    61.    (meters)      200.    (feet) SCALED
 HV4154  ______________________________________________________________________
 HV4154  GEOID HEIGHT    -        -32.052 (meters)                     GEOID18
 HV4154  LAPLACE CORR    -         -3.02  (seconds)                    DEFLEC18
 HV4154  HORZ ORDER      -  SECOND
 HV4154
 HV4154.The horizontal coordinates were established by classical geodetic methods
 HV4154.and adjusted by the National Geodetic Survey in November 1994.
 HV4154
 HV4154.The orthometric height was scaled from a topographic map.
 HV4154
 HV4154.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4154.GEOID18 height accuracy estimate available here.
 HV4154
 HV4154.Click photographs - Photos may exist for this station.
 HV4154
 HV4154.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4154
 HV4154. The following values were computed from the NAD 83(1993) position.
 HV4154
 HV4154;                    North         East     Units Scale Factor Converg.
 HV4154;SPC MD       -   139,993.946   399,227.625   MT  0.99995026   -0 00 20.1
 HV4154;SPC MD       -   459,296.80  1,309,799.30   sFT  0.99995026   -0 00 20.1
 HV4154;SPC VA N     - 2,141,038.798 3,629,288.637   MT  0.99996302   +0 55 50.2
 HV4154;SPC VA N     - 7,024,391.46 11,907,091.14   sFT  0.99996302   +0 55 50.2
 HV4154;UTM  18      - 4,310,685.756   325,860.990   MT  0.99997342   -1 15 45.3
 HV4154
 HV4154!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4154!SPC MD       -   0.99999549  x   0.99995026  =   0.99994575
 HV4154!SPC VA N     -   0.99999549  x   0.99996302  =   0.99995851
 HV4154!UTM  18      -   0.99999549  x   0.99997342  =   0.99996891
 HV4154
 HV4154:                Primary Azimuth Mark                     Grid Az
 HV4154:SPC MD       -  NE 131 B                                 180 05 54.6
 HV4154:SPC VA N     -  NE 131 B                                 179 09 44.3
 HV4154:UTM  18      -  NE 131 B                                 181 21 19.8
 HV4154
 HV4154_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2586010685(NAD 83)
 HV4154
 HV4154|---------------------------------------------------------------------|
 HV4154| PID    Reference Object                     Distance      Geod. Az  |
 HV4154|                                                           dddmmss.s |
 HV4154| HV2181 NE 131 DCDHT                        375.956 METERS 02650     |
 HV4154| HV2182 NE 131 B                            APPROX. 0.7 KM 1800534.5 |
 HV4154|---------------------------------------------------------------------|
 HV4154
 HV4154                          SUPERSEDED SURVEY CONTROL
 HV4154
 HV4154  NAD 83(1991)-  38 55 40.16249(N)    077 00 32.06828(W) AD(       ) 2
 HV4154  NAD 83(1986)-  38 55 40.16169(N)    077 00 32.07860(W) AD(       ) 2
 HV4154  NAD 27      -  38 55 39.76320(N)    077 00 33.15960(W) AD(       ) 2
 HV4154
 HV4154.Superseded values are not recommended for survey control.
 HV4154
 HV4154.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4154.See file dsdata.pdf to determine how the superseded data were derived.
 HV4154
 HV4154_MARKER: Z = SEE DESCRIPTION
 HV4154_SETTING: 0 = UNSPECIFIED SETTING
 HV4154_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4154
 HV4154  HISTORY     - Date     Condition        Report By
 HV4154  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4154  HISTORY     - 1971     GOOD             NGS
 HV4154
 HV4154                          STATION DESCRIPTION
 HV4154
 HV4154'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4154'NOTE--THIS STATION (N.E.-131-A) IS LOCATED IN THE SOLDIERS HOME
 HV4154'GROUNDS.
 HV4154
 HV4154                          STATION RECOVERY (1971)
 HV4154
 HV4154'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4154'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  IT IS IN THE
 HV4154'FIRST CATCH BASIN NORTH ALONG NORTH CAPITOL ST. FROM MICHIGAN AVE.
 HV4154'
 HV4154'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4154'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7693 ***********************************************************************
 HV7693  DESIGNATION -  N E 131 D 1960
 HV7693  PID         -  HV7693
 HV7693  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7693  COUNTRY     -  US
 HV7693  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7693
 HV7693                         *CURRENT SURVEY CONTROL
 HV7693  ______________________________________________________________________
 HV7693* NAD 83(1993) POSITION- 38 56 02.13771(N) 076 59 40.65689(W)   ADJUSTED
 HV7693* NAVD 88 ORTHO HEIGHT -    47.    (meters)      154.    (feet) SCALED
 HV7693  ______________________________________________________________________
 HV7693  GEOID HEIGHT    -        -32.066 (meters)                     GEOID18
 HV7693  LAPLACE CORR    -         -3.62  (seconds)                    DEFLEC18
 HV7693  HORZ ORDER      -  SECOND
 HV7693
 HV7693.The horizontal coordinates were established by classical geodetic methods
 HV7693.and adjusted by the National Geodetic Survey in November 1994.
 HV7693
 HV7693.The orthometric height was scaled from a topographic map.
 HV7693
 HV7693.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7693.GEOID18 height accuracy estimate available here.
 HV7693
 HV7693.Click photographs - Photos may exist for this station.
 HV7693
 HV7693.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7693
 HV7693. The following values were computed from the NAD 83(1993) position.
 HV7693
 HV7693;                    North         East     Units Scale Factor Converg.
 HV7693;SPC MD       -   140,671.511   400,465.861   MT  0.99995036   +0 00 12.1
 HV7693;SPC MD       -   461,519.78  1,313,861.75   sFT  0.99995036   +0 00 12.1
 HV7693;SPC VA N     - 2,141,736.513 3,630,515.652   MT  0.99996360   +0 56 22.3
 HV7693;SPC VA N     - 7,026,680.54 11,911,116.77   sFT  0.99996360   +0 56 22.3
 HV7693;UTM  18      - 4,311,336.007   327,113.817   MT  0.99996806   -1 15 13.6
 HV7693
 HV7693!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7693!SPC MD       -   0.99999769  x   0.99995036  =   0.99994805
 HV7693!SPC VA N     -   0.99999769  x   0.99996360  =   0.99996129
 HV7693!UTM  18      -   0.99999769  x   0.99996806  =   0.99996575
 HV7693
 HV7693:                Primary Azimuth Mark                     Grid Az
 HV7693:SPC MD       -  N E 131 C 1960                           239 37 17.4
 HV7693:SPC VA N     -  N E 131 C 1960                           238 41 07.2
 HV7693:UTM  18      -  N E 131 C 1960                           240 52 43.1
 HV7693
 HV7693_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2711311336(NAD 83)
 HV7693
 HV7693|---------------------------------------------------------------------|
 HV7693| PID    Reference Object                     Distance      Geod. Az  |
 HV7693|                                                           dddmmss.s |
 HV7693| HV1495 NE 138 DCDHT                        165.936 METERS 10701     |
 HV7693| HV7697 N E 131 C 1960                      432.377 METERS 2393729.5 |
 HV7693|---------------------------------------------------------------------|
 HV7693
 HV7693                          SUPERSEDED SURVEY CONTROL
 HV7693
 HV7693  NAD 83(1991)-  38 56 02.13665(N)    076 59 40.65791(W) AD(       ) 2
 HV7693  NAD 83(1986)-  38 56 02.13574(N)    076 59 40.66813(W) AD(       ) 2
 HV7693  NAD 27      -  38 56 01.73720(N)    076 59 41.75300(W) AD(       ) 2
 HV7693
 HV7693.Superseded values are not recommended for survey control.
 HV7693
 HV7693.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7693.See file dsdata.pdf to determine how the superseded data were derived.
 HV7693
 HV7693_MARKER: Z = SEE DESCRIPTION
 HV7693_SETTING: 0 = UNSPECIFIED SETTING
 HV7693_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7693
 HV7693  HISTORY     - Date     Condition        Report By
 HV7693  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7693  HISTORY     - 1971     GOOD             NGS
 HV7693
 HV7693                          STATION DESCRIPTION
 HV7693
 HV7693'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7693'THE STATION IS A TACK SET IN CONCRETE IN THE SIDEWALK.
 HV7693
 HV7693                          STATION RECOVERY (1971)
 HV7693
 HV7693'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7693'STATION WAS RECOVERED AS DESCRIBED IN GOOD CONDITION AND IS
 HV7693'LOCATED AT A + JOINT IN CENTER OF SIDEWALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4151 ***********************************************************************
 HV4151  DESIGNATION -  N E 132 A 1960
 HV4151  PID         -  HV4151
 HV4151  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4151  COUNTRY     -  US
 HV4151  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4151
 HV4151                         *CURRENT SURVEY CONTROL
 HV4151  ______________________________________________________________________
 HV4151* NAD 83(1993) POSITION- 38 54 47.88059(N) 077 00 32.13819(W)   ADJUSTED
 HV4151* NAVD 88 ORTHO HEIGHT -    30.    (meters)       98.    (feet) SCALED
 HV4151  ______________________________________________________________________
 HV4151  GEOID HEIGHT    -        -32.079 (meters)                     GEOID18
 HV4151  LAPLACE CORR    -         -3.26  (seconds)                    DEFLEC18
 HV4151  HORZ ORDER      -  SECOND
 HV4151
 HV4151.The horizontal coordinates were established by classical geodetic methods
 HV4151.and adjusted by the National Geodetic Survey in November 1994.
 HV4151
 HV4151.The orthometric height was scaled from a topographic map.
 HV4151
 HV4151.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4151.GEOID18 height accuracy estimate available here.
 HV4151
 HV4151.Click photographs - Photos may exist for this station.
 HV4151
 HV4151.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4151
 HV4151. The following values were computed from the NAD 83(1993) position.
 HV4151
 HV4151;                    North         East     Units Scale Factor Converg.
 HV4151;SPC MD       -   138,381.766   399,225.758   MT  0.99995006   -0 00 20.2
 HV4151;SPC MD       -   454,007.51  1,309,793.17   sFT  0.99995006   -0 00 20.2
 HV4151;SPC VA N     - 2,139,426.782 3,629,313.112   MT  0.99996168   +0 55 50.2
 HV4151;SPC VA N     - 7,019,102.70 11,907,171.43   sFT  0.99996168   +0 55 50.2
 HV4151;UTM  18      - 4,309,073.967   325,823.761   MT  0.99997358   -1 15 44.0
 HV4151
 HV4151!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4151!SPC MD       -   1.00000036  x   0.99995006  =   0.99995042
 HV4151!SPC VA N     -   1.00000036  x   0.99996168  =   0.99996204
 HV4151!UTM  18      -   1.00000036  x   0.99997358  =   0.99997394
 HV4151
 HV4151_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2582309073(NAD 83)
 HV4151
 HV4151|---------------------------------------------------------------------|
 HV4151| PID    Reference Object                     Distance      Geod. Az  |
 HV4151|                                                           dddmmss.s |
 HV4151| HV4152 NW 132                              384.294 METERS 00005     |
 HV4151| HV2184 NE 132 B DCDHT                      301.319 METERS 17907     |
 HV4151|---------------------------------------------------------------------|
 HV4151
 HV4151                          SUPERSEDED SURVEY CONTROL
 HV4151
 HV4151  NAD 83(1991)-  38 54 47.87952(N)    077 00 32.13932(W) AD(       ) 2
 HV4151  NAD 83(1986)-  38 54 47.87869(N)    077 00 32.14986(W) AD(       ) 2
 HV4151  NAD 27      -  38 54 47.47930(N)    077 00 33.23170(W) AD(       ) 2
 HV4151
 HV4151.Superseded values are not recommended for survey control.
 HV4151
 HV4151.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4151.See file dsdata.pdf to determine how the superseded data were derived.
 HV4151
 HV4151_MARKER: Z = SEE DESCRIPTION
 HV4151_SETTING: 0 = UNSPECIFIED SETTING
 HV4151_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4151
 HV4151  HISTORY     - Date     Condition        Report By
 HV4151  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4151  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4151
 HV4151                          STATION DESCRIPTION
 HV4151
 HV4151'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4151'STATION WAS NOT FOUND, AND IS BELIEVED DESTROYED BY NEW STREET
 HV4151'CONSTRUCTION.
 HV4151'
 HV4151'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4151'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7699 ***********************************************************************
 HV7699  DESIGNATION -  N E 135 A 1960
 HV7699  PID         -  HV7699
 HV7699  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7699  COUNTRY     -  US
 HV7699  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7699
 HV7699                         *CURRENT SURVEY CONTROL
 HV7699  ______________________________________________________________________
 HV7699* NAD 83(1993) POSITION- 38 56 47.62361(N) 076 59 20.01010(W)   ADJUSTED
 HV7699* NAVD 88 ORTHO HEIGHT -    37.    (meters)      121.    (feet) SCALED
 HV7699  ______________________________________________________________________
 HV7699  GEOID HEIGHT    -        -32.062 (meters)                     GEOID18
 HV7699  LAPLACE CORR    -         -3.68  (seconds)                    DEFLEC18
 HV7699  HORZ ORDER      -  SECOND
 HV7699
 HV7699.The horizontal coordinates were established by classical geodetic methods
 HV7699.and adjusted by the National Geodetic Survey in November 1994.
 HV7699
 HV7699.The orthometric height was scaled from a topographic map.
 HV7699
 HV7699.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7699.GEOID18 height accuracy estimate available here.
 HV7699
 HV7699.Click photographs - Photos may exist for this station.
 HV7699
 HV7699.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7699
 HV7699. The following values were computed from the NAD 83(1993) position.
 HV7699
 HV7699;                    North         East     Units Scale Factor Converg.
 HV7699;SPC MD       -   142,074.150   400,962.948   MT  0.99995061   +0 00 25.1
 HV7699;SPC MD       -   466,121.61  1,315,492.61   sFT  0.99995061   +0 00 25.1
 HV7699;SPC VA N     - 2,143,147.105 3,630,989.764   MT  0.99996484   +0 56 35.2
 HV7699;SPC VA N     - 7,031,308.46 11,912,672.25   sFT  0.99996484   +0 56 35.2
 HV7699;UTM  18      - 4,312,727.423   327,641.572   MT  0.99996582   -1 15 01.9
 HV7699
 HV7699!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7699!SPC MD       -   0.99999926  x   0.99995061  =   0.99994987
 HV7699!SPC VA N     -   0.99999926  x   0.99996484  =   0.99996410
 HV7699!UTM  18      -   0.99999926  x   0.99996582  =   0.99996508
 HV7699
 HV7699:                Primary Azimuth Mark                     Grid Az
 HV7699:SPC MD       -  NE 135                                   315 07 32.1
 HV7699:SPC VA N     -  NE 135                                   314 11 22.0
 HV7699:UTM  18      -  NE 135                                   316 22 59.1
 HV7699
 HV7699_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2764112727(NAD 83)
 HV7699
 HV7699|---------------------------------------------------------------------|
 HV7699| PID    Reference Object                     Distance      Geod. Az  |
 HV7699|                                                           dddmmss.s |
 HV7699| HV7704 N E 135 B 1960                      203.386 METERS 13224     |
 HV7699| HV1493 NE 135                              APPROX. 0.5 KM 3150757.2 |
 HV7699|---------------------------------------------------------------------|
 HV7699
 HV7699                          SUPERSEDED SURVEY CONTROL
 HV7699
 HV7699  NAD 83(1991)-  38 56 47.62256(N)    076 59 20.01105(W) AD(       ) 2
 HV7699  NAD 83(1986)-  38 56 47.62160(N)    076 59 20.02112(W) AD(       ) 2
 HV7699  NAD 27      -  38 56 47.22500(N)    076 59 21.10130(W) AD(       ) 2
 HV7699
 HV7699.Superseded values are not recommended for survey control.
 HV7699
 HV7699.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7699.See file dsdata.pdf to determine how the superseded data were derived.
 HV7699
 HV7699_MARKER: Z = SEE DESCRIPTION
 HV7699_SETTING: 0 = UNSPECIFIED SETTING
 HV7699_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7699
 HV7699  HISTORY     - Date     Condition        Report By
 HV7699  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7699  HISTORY     - 1971     GOOD             NGS
 HV7699
 HV7699                          STATION DESCRIPTION
 HV7699
 HV7699'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7699'THE STATION MARK IS AN IRON PIPE WITH A BRASS SCREW IN THE CENTER,
 HV7699'SET IN THE SIDEWALK.
 HV7699
 HV7699                          STATION RECOVERY (1971)
 HV7699
 HV7699'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7699'STATION WAS RECOVERED IN GOOD CONDITION AS PREVIOUSLY
 HV7699'DESCRIBED.  ORIGINAL DESCRIPTION IS ADEQUATE, WITH THE FOLLOWING
 HV7699'ADDITIONS--STATION IS 7.6 FEET NORTH-NORTHWEST OF CENTER OF
 HV7699'STREET SIGNAL POLE, 5.2 FEET WEST OF CURB OF SOUTH DAKOTA AVE.,
 HV7699'4.9 FEET EAST OF WEST EDGE OF SIDEWALK, AND SET IN A JOINT
 HV7699'BETWEEN SECTIONS OF THE SIDEWALK.
 HV7699'
 HV7699'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7699'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7704 ***********************************************************************
 HV7704  DESIGNATION -  N E 135 B 1960
 HV7704  PID         -  HV7704
 HV7704  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7704  COUNTRY     -  US
 HV7704  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7704
 HV7704                         *CURRENT SURVEY CONTROL
 HV7704  ______________________________________________________________________
 HV7704* NAD 83(1993) POSITION- 38 56 43.17686(N) 076 59 13.77256(W)   ADJUSTED
 HV7704* NAVD 88 ORTHO HEIGHT -    36.    (meters)      118.    (feet) SCALED
 HV7704  ______________________________________________________________________
 HV7704  GEOID HEIGHT    -        -32.066 (meters)                     GEOID18
 HV7704  LAPLACE CORR    -         -3.77  (seconds)                    DEFLEC18
 HV7704  HORZ ORDER      -  SECOND
 HV7704
 HV7704.The horizontal coordinates were established by classical geodetic methods
 HV7704.and adjusted by the National Geodetic Survey in November 1994.
 HV7704
 HV7704.The orthometric height was scaled from a topographic map.
 HV7704
 HV7704.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7704.GEOID18 height accuracy estimate available here.
 HV7704
 HV7704.Click photographs - Photos may exist for this station.
 HV7704
 HV7704.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7704
 HV7704. The following values were computed from the NAD 83(1993) position.
 HV7704
 HV7704;                    North         East     Units Scale Factor Converg.
 HV7704;SPC MD       -   141,937.050   401,113.166   MT  0.99995058   +0 00 29.0
 HV7704;SPC MD       -   465,671.80  1,315,985.45   sFT  0.99995058   +0 00 29.0
 HV7704;SPC VA N     - 2,143,012.476 3,631,142.204   MT  0.99996471   +0 56 39.1
 HV7704;SPC VA N     - 7,030,866.77 11,913,172.38   sFT  0.99996471   +0 56 39.1
 HV7704;UTM  18      - 4,312,587.058   327,788.747   MT  0.99996519   -1 14 57.8
 HV7704
 HV7704!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7704!SPC MD       -   0.99999942  x   0.99995058  =   0.99995000
 HV7704!SPC VA N     -   0.99999942  x   0.99996471  =   0.99996413
 HV7704!UTM  18      -   0.99999942  x   0.99996519  =   0.99996461
 HV7704
 HV7704:                Primary Azimuth Mark                     Grid Az
 HV7704:SPC MD       -  NE 136                                   133 11 24.7
 HV7704:SPC VA N     -  NE 136                                   132 15 14.6
 HV7704:UTM  18      -  NE 136                                   134 26 51.5
 HV7704
 HV7704_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2778812587(NAD 83)
 HV7704
 HV7704|---------------------------------------------------------------------|
 HV7704| PID    Reference Object                     Distance      Geod. Az  |
 HV7704|                                                           dddmmss.s |
 HV7704| HV1494 NE 136                              410.242 METERS 1331153.7 |
 HV7704| HV7699 N E 135 A 1960                      203.386 METERS 31224     |
 HV7704|---------------------------------------------------------------------|
 HV7704
 HV7704                          SUPERSEDED SURVEY CONTROL
 HV7704
 HV7704  NAD 83(1991)-  38 56 43.17580(N)    076 59 13.77351(W) AD(       ) 2
 HV7704  NAD 83(1986)-  38 56 43.17483(N)    076 59 13.78360(W) AD(       ) 2
 HV7704  NAD 27      -  38 56 42.77810(N)    076 59 14.86450(W) AD(       ) 2
 HV7704
 HV7704.Superseded values are not recommended for survey control.
 HV7704
 HV7704.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7704.See file dsdata.pdf to determine how the superseded data were derived.
 HV7704
 HV7704_MARKER: Z = SEE DESCRIPTION
 HV7704_SETTING: 0 = UNSPECIFIED SETTING
 HV7704_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7704
 HV7704  HISTORY     - Date     Condition        Report By
 HV7704  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7704  HISTORY     - 1971     GOOD             NGS
 HV7704
 HV7704                          STATION DESCRIPTION
 HV7704
 HV7704'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7704'THE STATION MARK IS AN IRON PIPE WITH A BRASS SCREW IN THE CENTER,
 HV7704'SET IN THE SIDEWALK.
 HV7704
 HV7704                          STATION RECOVERY (1971)
 HV7704
 HV7704'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7704'STATION WAS RECOVERED IN GOOD CONDITION.  ORIGINAL DESCRIPTION
 HV7704'IS ADEQUATE.
 HV7704'
 HV7704'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7704'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7688 ***********************************************************************
 HV7688  DESIGNATION -  N E 136 A 1960
 HV7688  PID         -  HV7688
 HV7688  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7688  COUNTRY     -  US
 HV7688  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7688
 HV7688                         *CURRENT SURVEY CONTROL
 HV7688  ______________________________________________________________________
 HV7688* NAD 83(1993) POSITION- 38 56 25.23079(N) 076 58 52.08481(W)   ADJUSTED
 HV7688* NAVD 88 ORTHO HEIGHT -    30.    (meters)       98.    (feet) SCALED
 HV7688  ______________________________________________________________________
 HV7688  GEOID HEIGHT    -        -32.085 (meters)                     GEOID18
 HV7688  LAPLACE CORR    -         -4.10  (seconds)                    DEFLEC18
 HV7688  HORZ ORDER      -  SECOND
 HV7688
 HV7688.The horizontal coordinates were established by classical geodetic methods
 HV7688.and adjusted by the National Geodetic Survey in November 1994.
 HV7688
 HV7688.The orthometric height was scaled from a topographic map.
 HV7688
 HV7688.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7688.GEOID18 height accuracy estimate available here.
 HV7688
 HV7688.Click photographs - Photos may exist for this station.
 HV7688
 HV7688.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7688
 HV7688. The following values were computed from the NAD 83(1993) position.
 HV7688
 HV7688;                    North         East     Units Scale Factor Converg.
 HV7688;SPC MD       -   141,383.760   401,635.526   MT  0.99995048   +0 00 42.6
 HV7688;SPC MD       -   463,856.55  1,317,699.22   sFT  0.99995048   +0 00 42.6
 HV7688;SPC VA N     - 2,142,467.786 3,631,673.541   MT  0.99996422   +0 56 52.6
 HV7688;SPC VA N     - 7,029,079.73 11,914,915.61   sFT  0.99996422   +0 56 52.6
 HV7688;UTM  18      - 4,312,022.430   328,298.847   MT  0.99996303   -1 14 43.7
 HV7688
 HV7688!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7688!SPC MD       -   1.00000036  x   0.99995048  =   0.99995084
 HV7688!SPC VA N     -   1.00000036  x   0.99996422  =   0.99996458
 HV7688!UTM  18      -   1.00000036  x   0.99996303  =   0.99996339
 HV7688
 HV7688_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2829812022(NAD 83)
 HV7688
 HV7688|---------------------------------------------------------------------|
 HV7688| PID    Reference Object                     Distance      Geod. Az  |
 HV7688|                                                           dddmmss.s |
 HV7688| HV7728 N E 136 B 1960                      250.669 METERS 13646     |
 HV7688| HV1494 NE 136                              352.326 METERS 32041     |
 HV7688|---------------------------------------------------------------------|
 HV7688
 HV7688                          SUPERSEDED SURVEY CONTROL
 HV7688
 HV7688  NAD 83(1991)-  38 56 25.22971(N)    076 58 52.08576(W) AD(       ) 2
 HV7688  NAD 83(1986)-  38 56 25.22868(N)    076 58 52.09593(W) AD(       ) 2
 HV7688  NAD 27      -  38 56 24.83100(N)    076 58 53.17900(W) AD(       ) 2
 HV7688
 HV7688.Superseded values are not recommended for survey control.
 HV7688
 HV7688.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7688.See file dsdata.pdf to determine how the superseded data were derived.
 HV7688
 HV7688_MARKER: DS = TRIANGULATION STATION DISK
 HV7688_SETTING: 0 = UNSPECIFIED SETTING
 HV7688_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7688
 HV7688  HISTORY     - Date     Condition        Report By
 HV7688  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7688  HISTORY     - 1971     GOOD             NGS
 HV7688
 HV7688                          STATION DESCRIPTION
 HV7688
 HV7688'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7688'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV7688'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.E. 136-A
 HV7688'GROUTED IN CONCRETE WALK.
 HV7688
 HV7688                          STATION RECOVERY (1971)
 HV7688
 HV7688'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7688'STATION WAS RECOVERED IN GOOD CONDITION AS PREVIOUSLY
 HV7688'DESCRIBED.  ORIGINAL DESCRIPTION IS ADEQUATE, WITH THE FOLLOWING
 HV7688'ADDITIONS--STATION IS 135.3 FEET SOUTHEAST OF TRAFFIC SIGNAL
 HV7688'POLE, 182.0 FEET SOUTHEAST OF CENTER LINE OF TAYLOR STREET, AT
 HV7688'NORTHWEST SIDE OF DIRT DRIVEWAY TO GATE IN WIRE MESH FENCE, AND
 HV7688'1.2 FEET SOUTHWEST OF EDGE OF SIDEWALK.
 HV7688'
 HV7688'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7688'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7728 ***********************************************************************
 HV7728  DESIGNATION -  N E 136 B 1960
 HV7728  PID         -  HV7728
 HV7728  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7728  COUNTRY     -  US
 HV7728  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7728
 HV7728                         *CURRENT SURVEY CONTROL
 HV7728  ______________________________________________________________________
 HV7728* NAD 83(1993) POSITION- 38 56 19.30857(N) 076 58 44.95518(W)   ADJUSTED
 HV7728* NAVD 88 ORTHO HEIGHT -    35.    (meters)      115.    (feet) SCALED
 HV7728  ______________________________________________________________________
 HV7728  GEOID HEIGHT    -        -32.091 (meters)                     GEOID18
 HV7728  LAPLACE CORR    -         -4.20  (seconds)                    DEFLEC18
 HV7728  HORZ ORDER      -  SECOND
 HV7728
 HV7728.The horizontal coordinates were established by classical geodetic methods
 HV7728.and adjusted by the National Geodetic Survey in November 1994.
 HV7728
 HV7728.The orthometric height was scaled from a topographic map.
 HV7728
 HV7728.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7728.GEOID18 height accuracy estimate available here.
 HV7728
 HV7728.Click photographs - Photos may exist for this station.
 HV7728
 HV7728.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7728
 HV7728. The following values were computed from the NAD 83(1993) position.
 HV7728
 HV7728;                    North         East     Units Scale Factor Converg.
 HV7728;SPC MD       -   141,201.181   401,807.263   MT  0.99995045   +0 00 47.1
 HV7728;SPC MD       -   463,257.54  1,318,262.66   sFT  0.99995045   +0 00 47.1
 HV7728;SPC VA N     - 2,142,288.034 3,631,848.240   MT  0.99996406   +0 56 57.1
 HV7728;SPC VA N     - 7,028,489.99 11,915,488.77   sFT  0.99996406   +0 56 57.1
 HV7728;UTM  18      - 4,311,836.125   328,466.538   MT  0.99996232   -1 14 39.0
 HV7728
 HV7728!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7728!SPC MD       -   0.99999958  x   0.99995045  =   0.99995003
 HV7728!SPC VA N     -   0.99999958  x   0.99996406  =   0.99996364
 HV7728!UTM  18      -   0.99999958  x   0.99996232  =   0.99996190
 HV7728
 HV7728_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2846611836(NAD 83)
 HV7728
 HV7728                          SUPERSEDED SURVEY CONTROL
 HV7728
 HV7728  NAD 83(1991)-  38 56 19.30749(N)    076 58 44.95613(W) AD(       ) 2
 HV7728  NAD 83(1986)-  38 56 19.30645(N)    076 58 44.96633(W) AD(       ) 2
 HV7728  NAD 27      -  38 56 18.90870(N)    076 58 46.05020(W) AD(       ) 2
 HV7728
 HV7728.Superseded values are not recommended for survey control.
 HV7728
 HV7728.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7728.See file dsdata.pdf to determine how the superseded data were derived.
 HV7728
 HV7728_MARKER: Z = SEE DESCRIPTION
 HV7728_SETTING: 0 = UNSPECIFIED SETTING
 HV7728_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7728
 HV7728  HISTORY     - Date     Condition        Report By
 HV7728  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7728  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7728
 HV7728                          STATION DESCRIPTION
 HV7728
 HV7728'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7728'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7728
 HV7728                          STATION RECOVERY (1971)
 HV7728
 HV7728'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7728'STATION MARK HAS BEEN DESTROYED BY CONSTRUCTION OF NEW SIDEWALK.
 HV7728'
 HV7728'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7728'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7720 ***********************************************************************
 HV7720  DESIGNATION -  N E 136 C 1960
 HV7720  PID         -  HV7720
 HV7720  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7720  COUNTRY     -  US
 HV7720  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7720
 HV7720                         *CURRENT SURVEY CONTROL
 HV7720  ______________________________________________________________________
 HV7720* NAD 83(1993) POSITION- 38 56 12.77353(N) 076 58 38.96615(W)   ADJUSTED
 HV7720* NAVD 88 ORTHO HEIGHT -    23.    (meters)       75.    (feet) SCALED
 HV7720  ______________________________________________________________________
 HV7720  GEOID HEIGHT    -        -32.097 (meters)                     GEOID18
 HV7720  LAPLACE CORR    -         -4.28  (seconds)                    DEFLEC18
 HV7720  HORZ ORDER      -  SECOND
 HV7720
 HV7720.The horizontal coordinates were established by classical geodetic methods
 HV7720.and adjusted by the National Geodetic Survey in November 1994.
 HV7720
 HV7720.The orthometric height was scaled from a topographic map.
 HV7720
 HV7720.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7720.GEOID18 height accuracy estimate available here.
 HV7720
 HV7720.Click photographs - Photos may exist for this station.
 HV7720
 HV7720.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7720
 HV7720. The following values were computed from the NAD 83(1993) position.
 HV7720
 HV7720;                    North         East     Units Scale Factor Converg.
 HV7720;SPC MD       -   140,999.702   401,951.543   MT  0.99995041   +0 00 50.9
 HV7720;SPC MD       -   462,596.52  1,318,736.02   sFT  0.99995041   +0 00 50.9
 HV7720;SPC VA N     - 2,142,088.937 3,631,995.794   MT  0.99996388   +0 57 00.8
 HV7720;SPC VA N     - 7,027,836.79 11,915,972.87   sFT  0.99996388   +0 57 00.8
 HV7720;UTM  18      - 4,311,631.526   328,606.364   MT  0.99996173   -1 14 35.1
 HV7720
 HV7720!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7720!SPC MD       -   1.00000146  x   0.99995041  =   0.99995187
 HV7720!SPC VA N     -   1.00000146  x   0.99996388  =   0.99996534
 HV7720!UTM  18      -   1.00000146  x   0.99996173  =   0.99996319
 HV7720
 HV7720:                Primary Azimuth Mark                     Grid Az
 HV7720:SPC MD       -  NE 136 D DCDHT                           140 49 31.1
 HV7720:SPC VA N     -  NE 136 D DCDHT                           139 53 21.2
 HV7720:UTM  18      -  NE 136 D DCDHT                           142 04 57.1
 HV7720
 HV7720_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2860611631(NAD 83)
 HV7720
 HV7720|---------------------------------------------------------------------|
 HV7720| PID    Reference Object                     Distance      Geod. Az  |
 HV7720|                                                           dddmmss.s |
 HV7720| HV1486 NE 136 D DCDHT                      410.273 METERS 1405022.0 |
 HV7720| HV7728 N E 136 B 1960                      247.824 METERS 32424     |
 HV7720|---------------------------------------------------------------------|
 HV7720
 HV7720                          SUPERSEDED SURVEY CONTROL
 HV7720
 HV7720  NAD 83(1991)-  38 56 12.77243(N)    076 58 38.96710(W) AD(       ) 2
 HV7720  NAD 83(1986)-  38 56 12.77138(N)    076 58 38.97732(W) AD(       ) 2
 HV7720  NAD 27      -  38 56 12.37370(N)    076 58 40.06200(W) AD(       ) 2
 HV7720
 HV7720.Superseded values are not recommended for survey control.
 HV7720
 HV7720.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7720.See file dsdata.pdf to determine how the superseded data were derived.
 HV7720
 HV7720_MARKER: Z = SEE DESCRIPTION
 HV7720_SETTING: 0 = UNSPECIFIED SETTING
 HV7720_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7720
 HV7720  HISTORY     - Date     Condition        Report By
 HV7720  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7720  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7720
 HV7720                          STATION DESCRIPTION
 HV7720
 HV7720'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7720'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7720
 HV7720                          STATION RECOVERY (1971)
 HV7720
 HV7720'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7720'STATION WAS NOT RECOVERED, AND IS BELIEVED TO BE DESTROYED.
 HV7720'
 HV7720'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7720'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7734 ***********************************************************************
 HV7734  DESIGNATION -  N E 137 A 1960
 HV7734  PID         -  HV7734
 HV7734  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7734  COUNTRY     -  US
 HV7734  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7734
 HV7734                         *CURRENT SURVEY CONTROL
 HV7734  ______________________________________________________________________
 HV7734* NAD 83(1993) POSITION- 38 55 46.11745(N) 076 58 10.39383(W)   ADJUSTED
 HV7734* NAVD 88 ORTHO HEIGHT -    26.    (meters)       85.    (feet) SCALED
 HV7734  ______________________________________________________________________
 HV7734  GEOID HEIGHT    -        -32.128 (meters)                     GEOID18
 HV7734  LAPLACE CORR    -         -4.56  (seconds)                    DEFLEC18
 HV7734  HORZ ORDER      -  SECOND
 HV7734
 HV7734.The horizontal coordinates were established by classical geodetic methods
 HV7734.and adjusted by the National Geodetic Survey in November 1994.
 HV7734
 HV7734.The orthometric height was scaled from a topographic map.
 HV7734
 HV7734.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7734.GEOID18 height accuracy estimate available here.
 HV7734
 HV7734.Click photographs - Photos may exist for this station.
 HV7734
 HV7734.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7734
 HV7734. The following values were computed from the NAD 83(1993) position.
 HV7734
 HV7734;                    North         East     Units Scale Factor Converg.
 HV7734;SPC MD       -   140,177.941   402,639.926   MT  0.99995029   +0 01 08.8
 HV7734;SPC MD       -   459,900.46  1,320,994.49   sFT  0.99995029   +0 01 08.8
 HV7734;SPC VA N     - 2,141,278.522 3,632,697.520   MT  0.99996317   +0 57 18.6
 HV7734;SPC VA N     - 7,025,177.95 11,918,275.11   sFT  0.99996317   +0 57 18.6
 HV7734;UTM  18      - 4,310,794.853   329,276.560   MT  0.99995891   -1 14 16.4
 HV7734
 HV7734!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7734!SPC MD       -   1.00000100  x   0.99995029  =   0.99995129
 HV7734!SPC VA N     -   1.00000100  x   0.99996317  =   0.99996417
 HV7734!UTM  18      -   1.00000100  x   0.99995891  =   0.99995991
 HV7734
 HV7734_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2927610794(NAD 83)
 HV7734
 HV7734                          SUPERSEDED SURVEY CONTROL
 HV7734
 HV7734  NAD 83(1991)-  38 55 46.11633(N)    076 58 10.39481(W) AD(       ) 2
 HV7734  NAD 83(1986)-  38 55 46.11527(N)    076 58 10.40511(W) AD(       ) 2
 HV7734  NAD 27      -  38 55 45.71660(N)    076 58 11.49200(W) AD(       ) 2
 HV7734
 HV7734.Superseded values are not recommended for survey control.
 HV7734
 HV7734.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7734.See file dsdata.pdf to determine how the superseded data were derived.
 HV7734
 HV7734_MARKER: Z = SEE DESCRIPTION
 HV7734_SETTING: 0 = UNSPECIFIED SETTING
 HV7734_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7734
 HV7734  HISTORY     - Date     Condition        Report By
 HV7734  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7734  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7734
 HV7734                          STATION DESCRIPTION
 HV7734
 HV7734'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7734'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7734
 HV7734                          STATION RECOVERY (1971)
 HV7734
 HV7734'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7734'STATION WAS DESTROYED WHEN STREET WAS WIDENED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7732 ***********************************************************************
 HV7732  DESIGNATION -  N E 137 B 1960
 HV7732  PID         -  HV7732
 HV7732  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7732  COUNTRY     -  US
 HV7732  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7732
 HV7732                         *CURRENT SURVEY CONTROL
 HV7732  ______________________________________________________________________
 HV7732* NAD 83(1993) POSITION- 38 55 42.13823(N) 076 58 06.34262(W)   ADJUSTED
 HV7732* NAVD 88 ORTHO HEIGHT -    38.    (meters)      125.    (feet) SCALED
 HV7732  ______________________________________________________________________
 HV7732  GEOID HEIGHT    -        -32.133 (meters)                     GEOID18
 HV7732  LAPLACE CORR    -         -4.59  (seconds)                    DEFLEC18
 HV7732  HORZ ORDER      -  SECOND
 HV7732
 HV7732.The horizontal coordinates were established by classical geodetic methods
 HV7732.and adjusted by the National Geodetic Survey in November 1994.
 HV7732
 HV7732.The orthometric height was scaled from a topographic map.
 HV7732
 HV7732.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7732.GEOID18 height accuracy estimate available here.
 HV7732
 HV7732.Click photographs - Photos may exist for this station.
 HV7732
 HV7732.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7732
 HV7732. The following values were computed from the NAD 83(1993) position.
 HV7732
 HV7732;                    North         East     Units Scale Factor Converg.
 HV7732;SPC MD       -   140,055.272   402,737.544   MT  0.99995027   +0 01 11.3
 HV7732;SPC MD       -   459,498.00  1,321,314.76   sFT  0.99995027   +0 01 11.3
 HV7732;SPC VA N     - 2,141,157.462 3,632,797.130   MT  0.99996307   +0 57 21.2
 HV7732;SPC VA N     - 7,024,780.77 11,918,601.92   sFT  0.99996307   +0 57 21.2
 HV7732;UTM  18      - 4,310,670.071   329,371.464   MT  0.99995851   -1 14 13.8
 HV7732
 HV7732!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7732!SPC MD       -   0.99999912  x   0.99995027  =   0.99994939
 HV7732!SPC VA N     -   0.99999912  x   0.99996307  =   0.99996219
 HV7732!UTM  18      -   0.99999912  x   0.99995851  =   0.99995763
 HV7732
 HV7732:                Primary Azimuth Mark                     Grid Az
 HV7732:SPC MD       -  NE 137 C MADHOP                          140 44 48.5
 HV7732:SPC VA N     -  NE 137 C MADHOP                          139 48 38.6
 HV7732:UTM  18      -  NE 137 C MADHOP                          142 00 13.6
 HV7732
 HV7732_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2937110670(NAD 83)
 HV7732
 HV7732|---------------------------------------------------------------------|
 HV7732| PID    Reference Object                     Distance      Geod. Az  |
 HV7732|                                                           dddmmss.s |
 HV7732| HV1488 NE 137 C MADHOP                     422.183 METERS 1404559.8 |
 HV7732| HV7734 N E 137 A 1960                      156.778 METERS 32130     |
 HV7732|---------------------------------------------------------------------|
 HV7732
 HV7732                          SUPERSEDED SURVEY CONTROL
 HV7732
 HV7732  NAD 83(1991)-  38 55 42.13711(N)    076 58 06.34359(W) AD(       ) 2
 HV7732  NAD 83(1986)-  38 55 42.13606(N)    076 58 06.35391(W) AD(       ) 2
 HV7732  NAD 27      -  38 55 41.73710(N)    076 58 07.44110(W) AD(       ) 2
 HV7732
 HV7732.Superseded values are not recommended for survey control.
 HV7732
 HV7732.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7732.See file dsdata.pdf to determine how the superseded data were derived.
 HV7732
 HV7732_MARKER: Z = SEE DESCRIPTION
 HV7732_SETTING: 0 = UNSPECIFIED SETTING
 HV7732_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7732
 HV7732  HISTORY     - Date     Condition        Report By
 HV7732  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7732
 HV7732                          STATION DESCRIPTION
 HV7732
 HV7732'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7732'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7711 ***********************************************************************
 HV7711  DESIGNATION -  N E 137 E 1960
 HV7711  PID         -  HV7711
 HV7711  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7711  COUNTRY     -  US
 HV7711  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7711
 HV7711                         *CURRENT SURVEY CONTROL
 HV7711  ______________________________________________________________________
 HV7711* NAD 83(1993) POSITION- 38 55 15.92628(N) 076 57 32.89551(W)   ADJUSTED
 HV7711* NAVD 88 ORTHO HEIGHT -    29.    (meters)       95.    (feet) SCALED
 HV7711  ______________________________________________________________________
 HV7711  GEOID HEIGHT    -        -32.169 (meters)                     GEOID18
 HV7711  LAPLACE CORR    -         -4.65  (seconds)                    DEFLEC18
 HV7711  HORZ ORDER      -  SECOND
 HV7711
 HV7711.The horizontal coordinates were established by classical geodetic methods
 HV7711.and adjusted by the National Geodetic Survey in November 1994.
 HV7711
 HV7711.The orthometric height was scaled from a topographic map.
 HV7711
 HV7711.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7711.GEOID18 height accuracy estimate available here.
 HV7711
 HV7711.Click photographs - Photos may exist for this station.
 HV7711
 HV7711.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7711
 HV7711. The following values were computed from the NAD 83(1993) position.
 HV7711
 HV7711;                    North         East     Units Scale Factor Converg.
 HV7711;SPC MD       -   139,247.328   403,543.511   MT  0.99995016   +0 01 32.3
 HV7711;SPC MD       -   456,847.28  1,323,959.00   sFT  0.99995016   +0 01 32.3
 HV7711;SPC VA N     - 2,140,362.782 3,633,616.198   MT  0.99996239   +0 57 42.0
 HV7711;SPC VA N     - 7,022,173.56 11,921,289.14   sFT  0.99996239   +0 57 42.0
 HV7711;UTM  18      - 4,309,844.637   330,159.520   MT  0.99995521   -1 13 52.0
 HV7711
 HV7711!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7711!SPC MD       -   1.00000053  x   0.99995016  =   0.99995069
 HV7711!SPC VA N     -   1.00000053  x   0.99996239  =   0.99996292
 HV7711!UTM  18      -   1.00000053  x   0.99995521  =   0.99995574
 HV7711
 HV7711:                Primary Azimuth Mark                     Grid Az
 HV7711:SPC MD       -  NE 142 DCDHT                             132 47 40.3
 HV7711:SPC VA N     -  NE 142 DCDHT                             131 51 30.6
 HV7711:UTM  18      -  NE 142 DCDHT                             134 03 04.6
 HV7711
 HV7711_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3015909844(NAD 83)
 HV7711
 HV7711|---------------------------------------------------------------------|
 HV7711| PID    Reference Object                     Distance      Geod. Az  |
 HV7711|                                                           dddmmss.s |
 HV7711| HV1490 NE 142 DCDHT                        486.220 METERS 1324912.6 |
 HV7711| HV1489 NE 137 D MADHOP                     380.144 METERS 30939     |
 HV7711|---------------------------------------------------------------------|
 HV7711
 HV7711                          SUPERSEDED SURVEY CONTROL
 HV7711
 HV7711  NAD 83(1991)-  38 55 15.92511(N)    076 57 32.89651(W) AD(       ) 2
 HV7711  NAD 83(1986)-  38 55 15.92408(N)    076 57 32.90690(W) AD(       ) 2
 HV7711  NAD 27      -  38 55 15.52370(N)    076 57 33.99680(W) AD(       ) 2
 HV7711
 HV7711.Superseded values are not recommended for survey control.
 HV7711
 HV7711.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7711.See file dsdata.pdf to determine how the superseded data were derived.
 HV7711
 HV7711_MARKER: Z = SEE DESCRIPTION
 HV7711_SETTING: 0 = UNSPECIFIED SETTING
 HV7711_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7711
 HV7711  HISTORY     - Date     Condition        Report By
 HV7711  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7711  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7711
 HV7711                          STATION DESCRIPTION
 HV7711
 HV7711'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7711'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7711
 HV7711                          STATION RECOVERY (1971)
 HV7711
 HV7711'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7711'STATION WAS NOT RECOVERED, ALTHOUGH CONSIDERABLE DIGGING WAS
 HV7711'DONE AT THE POINT INDICATED BY THE PUBLISHED REFERENCE
 HV7711'MEASUREMENTS.
 HV7711'
 HV7711'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7711'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7703 ***********************************************************************
 HV7703  DESIGNATION -  N E 138 A 1960
 HV7703  PID         -  HV7703
 HV7703  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7703  COUNTRY     -  US
 HV7703  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7703
 HV7703                         *CURRENT SURVEY CONTROL
 HV7703  ______________________________________________________________________
 HV7703* NAD 83(1993) POSITION- 38 56 00.97432(N) 076 59 26.58079(W)   ADJUSTED
 HV7703* NAVD 88 ORTHO HEIGHT -    54.    (meters)      177.    (feet) SCALED
 HV7703  ______________________________________________________________________
 HV7703  GEOID HEIGHT    -        -32.074 (meters)                     GEOID18
 HV7703  LAPLACE CORR    -         -3.81  (seconds)                    DEFLEC18
 HV7703  HORZ ORDER      -  SECOND
 HV7703
 HV7703.The horizontal coordinates were established by classical geodetic methods
 HV7703.and adjusted by the National Geodetic Survey in November 1994.
 HV7703
 HV7703.The orthometric height was scaled from a topographic map.
 HV7703
 HV7703.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7703.GEOID18 height accuracy estimate available here.
 HV7703
 HV7703.Click photographs - Photos may exist for this station.
 HV7703
 HV7703.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7703
 HV7703. The following values were computed from the NAD 83(1993) position.
 HV7703
 HV7703;                    North         East     Units Scale Factor Converg.
 HV7703;SPC MD       -   140,635.665   400,804.874   MT  0.99995036   +0 00 21.0
 HV7703;SPC MD       -   461,402.18  1,314,973.99   sFT  0.99995036   +0 00 21.0
 HV7703;SPC VA N     - 2,141,706.209 3,630,855.210   MT  0.99996357   +0 56 31.1
 HV7703;SPC VA N     - 7,026,581.12 11,912,230.80   sFT  0.99996357   +0 56 31.1
 HV7703;UTM  18      - 4,311,292.730   327,451.968   MT  0.99996662   -1 15 04.7
 HV7703
 HV7703!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7703!SPC MD       -   0.99999660  x   0.99995036  =   0.99994696
 HV7703!SPC VA N     -   0.99999660  x   0.99996357  =   0.99996017
 HV7703!UTM  18      -   0.99999660  x   0.99996662  =   0.99996322
 HV7703
 HV7703_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2745111292(NAD 83)
 HV7703
 HV7703|---------------------------------------------------------------------|
 HV7703| PID    Reference Object                     Distance      Geod. Az  |
 HV7703|                                                           dddmmss.s |
 HV7703| HV7679 N E 138 B 1960                      355.889 METERS 08613     |
 HV7703| HV1495 NE 138 DCDHT                        180.810 METERS 26558     |
 HV7703|---------------------------------------------------------------------|
 HV7703
 HV7703                          SUPERSEDED SURVEY CONTROL
 HV7703
 HV7703  NAD 83(1991)-  38 56 00.97324(N)    076 59 26.58180(W) AD(       ) 2
 HV7703  NAD 83(1986)-  38 56 00.97230(N)    076 59 26.59204(W) AD(       ) 2
 HV7703  NAD 27      -  38 56 00.57390(N)    076 59 27.67660(W) AD(       ) 2
 HV7703
 HV7703.Superseded values are not recommended for survey control.
 HV7703
 HV7703.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7703.See file dsdata.pdf to determine how the superseded data were derived.
 HV7703
 HV7703_MARKER: Z = SEE DESCRIPTION
 HV7703_SETTING: 0 = UNSPECIFIED SETTING
 HV7703_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7703
 HV7703  HISTORY     - Date     Condition        Report By
 HV7703  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7703  HISTORY     - 1971     GOOD             NGS
 HV7703
 HV7703                          STATION DESCRIPTION
 HV7703
 HV7703'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7703'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7703
 HV7703                          STATION RECOVERY (1971)
 HV7703
 HV7703'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7703'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  IT IS
 HV7703'SET IN A CRACK IN THE SIDEWALK.
 HV7703'
 HV7703'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7703'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7679 ***********************************************************************
 HV7679  DESIGNATION -  N E 138 B 1960
 HV7679  PID         -  HV7679
 HV7679  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7679  COUNTRY     -  US
 HV7679  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7679
 HV7679                         *CURRENT SURVEY CONTROL
 HV7679  ______________________________________________________________________
 HV7679* NAD 83(1993) POSITION- 38 56 01.73612(N) 076 59 11.83686(W)   ADJUSTED
 HV7679* NAVD 88 ORTHO HEIGHT -    61.    (meters)      200.    (feet) SCALED
 HV7679  ______________________________________________________________________
 HV7679  GEOID HEIGHT    -        -32.083 (meters)                     GEOID18
 HV7679  LAPLACE CORR    -         -3.98  (seconds)                    DEFLEC18
 HV7679  HORZ ORDER      -  SECOND
 HV7679
 HV7679.The horizontal coordinates were established by classical geodetic methods
 HV7679.and adjusted by the National Geodetic Survey in November 1994.
 HV7679
 HV7679.The orthometric height was scaled from a topographic map.
 HV7679
 HV7679.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7679.GEOID18 height accuracy estimate available here.
 HV7679
 HV7679.Click photographs - Photos may exist for this station.
 HV7679
 HV7679.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7679
 HV7679. The following values were computed from the NAD 83(1993) position.
 HV7679
 HV7679;                    North         East     Units Scale Factor Converg.
 HV7679;SPC MD       -   140,659.199   401,159.966   MT  0.99995036   +0 00 30.2
 HV7679;SPC MD       -   461,479.39  1,316,138.99   sFT  0.99995036   +0 00 30.2
 HV7679;SPC VA N     - 2,141,735.543 3,631,209.875   MT  0.99996359   +0 56 40.3
 HV7679;SPC VA N     - 7,026,677.36 11,913,394.40   sFT  0.99996359   +0 56 40.3
 HV7679;UTM  18      - 4,311,308.469   327,807.496   MT  0.99996511   -1 14 55.5
 HV7679
 HV7679!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7679!SPC MD       -   0.99999550  x   0.99995036  =   0.99994586
 HV7679!SPC VA N     -   0.99999550  x   0.99996359  =   0.99995909
 HV7679!UTM  18      -   0.99999550  x   0.99996511  =   0.99996061
 HV7679
 HV7679_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2780711308(NAD 83)
 HV7679
 HV7679|---------------------------------------------------------------------|
 HV7679| PID    Reference Object                     Distance      Geod. Az  |
 HV7679|                                                           dddmmss.s |
 HV7679| HV7684 N E 138 C 1960                      172.582 METERS 08649     |
 HV7679| HV7703 N E 138 A 1960                      355.889 METERS 26613     |
 HV7679|---------------------------------------------------------------------|
 HV7679
 HV7679                          SUPERSEDED SURVEY CONTROL
 HV7679
 HV7679  NAD 83(1991)-  38 56 01.73504(N)    076 59 11.83786(W) AD(       ) 2
 HV7679  NAD 83(1986)-  38 56 01.73406(N)    076 59 11.84811(W) AD(       ) 2
 HV7679  NAD 27      -  38 56 01.33590(N)    076 59 12.93340(W) AD(       ) 2
 HV7679
 HV7679.Superseded values are not recommended for survey control.
 HV7679
 HV7679.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7679.See file dsdata.pdf to determine how the superseded data were derived.
 HV7679
 HV7679_MARKER: Z = SEE DESCRIPTION
 HV7679_SETTING: 0 = UNSPECIFIED SETTING
 HV7679_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7679
 HV7679  HISTORY     - Date     Condition        Report By
 HV7679  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7679  HISTORY     - 1971     GOOD             NGS
 HV7679
 HV7679                          STATION DESCRIPTION
 HV7679
 HV7679'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7679'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7679
 HV7679                          STATION RECOVERY (1971)
 HV7679
 HV7679'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7679'STATION WAS RECOVERED IN GOOD CONDITION AS PREVIOUSLY DESCRIBED.  IT
 HV7679'IS SET IN A CRACK IN THE SIDEWALK.
 HV7679'
 HV7679'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7679'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7684 ***********************************************************************
 HV7684  DESIGNATION -  N E 138 C 1960
 HV7684  PID         -  HV7684
 HV7684  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7684  COUNTRY     -  US
 HV7684  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7684
 HV7684                         *CURRENT SURVEY CONTROL
 HV7684  ______________________________________________________________________
 HV7684* NAD 83(1993) POSITION- 38 56 02.04626(N) 076 59 04.68242(W)   ADJUSTED
 HV7684* NAVD 88 ORTHO HEIGHT -    49.    (meters)      161.    (feet) SCALED
 HV7684  ______________________________________________________________________
 HV7684  GEOID HEIGHT    -        -32.087 (meters)                     GEOID18
 HV7684  LAPLACE CORR    -         -4.07  (seconds)                    DEFLEC18
 HV7684  HORZ ORDER      -  SECOND
 HV7684
 HV7684.The horizontal coordinates were established by classical geodetic methods
 HV7684.and adjusted by the National Geodetic Survey in November 1994.
 HV7684
 HV7684.The orthometric height was scaled from a topographic map.
 HV7684
 HV7684.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7684.GEOID18 height accuracy estimate available here.
 HV7684
 HV7684.Click photographs - Photos may exist for this station.
 HV7684
 HV7684.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7684
 HV7684. The following values were computed from the NAD 83(1993) position.
 HV7684
 HV7684;                    North         East     Units Scale Factor Converg.
 HV7684;SPC MD       -   140,668.790   401,332.272   MT  0.99995036   +0 00 34.7
 HV7684;SPC MD       -   461,510.86  1,316,704.30   sFT  0.99995036   +0 00 34.7
 HV7684;SPC VA N     - 2,141,747.947 3,631,382.004   MT  0.99996360   +0 56 44.8
 HV7684;SPC VA N     - 7,026,718.06 11,913,959.12   sFT  0.99996360   +0 56 44.8
 HV7684;UTM  18      - 4,311,314.277   327,979.974   MT  0.99996438   -1 14 51.0
 HV7684
 HV7684!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7684!SPC MD       -   0.99999738  x   0.99995036  =   0.99994774
 HV7684!SPC VA N     -   0.99999738  x   0.99996360  =   0.99996098
 HV7684!UTM  18      -   0.99999738  x   0.99996438  =   0.99996176
 HV7684
 HV7684_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2797911314(NAD 83)
 HV7684
 HV7684                          SUPERSEDED SURVEY CONTROL
 HV7684
 HV7684  NAD 83(1991)-  38 56 02.04518(N)    076 59 04.68341(W) AD(       ) 2
 HV7684  NAD 83(1986)-  38 56 02.04418(N)    076 59 04.69365(W) AD(       ) 2
 HV7684  NAD 27      -  38 56 01.64620(N)    076 59 05.77890(W) AD(       ) 2
 HV7684
 HV7684.Superseded values are not recommended for survey control.
 HV7684
 HV7684.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7684.See file dsdata.pdf to determine how the superseded data were derived.
 HV7684
 HV7684_MARKER: Z = SEE DESCRIPTION
 HV7684_SETTING: 0 = UNSPECIFIED SETTING
 HV7684_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7684
 HV7684  HISTORY     - Date     Condition        Report By
 HV7684  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7684  HISTORY     - 1971     GOOD             NGS
 HV7684
 HV7684                          STATION DESCRIPTION
 HV7684
 HV7684'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7684'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7684
 HV7684                          STATION RECOVERY (1971)
 HV7684
 HV7684'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7684'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  ORIGINAL
 HV7684'DESCRIPTION IS ADEQUATE, WITH THE FOLLOWING ADDITIONS--STATION IS
 HV7684'3.5 FEET NORTHWEST OF CENTER OF A MANHOLE COVER AND 14.6 FEET
 HV7684'EAST OF CENTER OF TOP NUT OF A FIRE HYDRANT.
 HV7684'
 HV7684'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7684'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7687 ***********************************************************************
 HV7687  DESIGNATION -  N E 138 D 1960
 HV7687  PID         -  HV7687
 HV7687  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7687  COUNTRY     -  US
 HV7687  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7687
 HV7687                         *CURRENT SURVEY CONTROL
 HV7687  ______________________________________________________________________
 HV7687* NAD 83(1993) POSITION- 38 56 02.63082(N) 076 58 53.48660(W)   ADJUSTED
 HV7687* NAVD 88 ORTHO HEIGHT -    34.    (meters)      112.    (feet) SCALED
 HV7687  ______________________________________________________________________
 HV7687  GEOID HEIGHT    -        -32.093 (meters)                     GEOID18
 HV7687  LAPLACE CORR    -         -4.18  (seconds)                    DEFLEC18
 HV7687  HORZ ORDER      -  SECOND
 HV7687
 HV7687.The horizontal coordinates were established by classical geodetic methods
 HV7687.and adjusted by the National Geodetic Survey in November 1994.
 HV7687
 HV7687.The orthometric height was scaled from a topographic map.
 HV7687
 HV7687.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7687.GEOID18 height accuracy estimate available here.
 HV7687
 HV7687.Click photographs - Photos may exist for this station.
 HV7687
 HV7687.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7687
 HV7687. The following values were computed from the NAD 83(1993) position.
 HV7687
 HV7687;                    North         East     Units Scale Factor Converg.
 HV7687;SPC MD       -   140,686.865   401,601.909   MT  0.99995036   +0 00 41.7
 HV7687;SPC MD       -   461,570.16  1,317,588.93   sFT  0.99995036   +0 00 41.7
 HV7687;SPC VA N     - 2,141,770.426 3,631,651.314   MT  0.99996361   +0 56 51.7
 HV7687;SPC VA N     - 7,026,791.81 11,914,842.69   sFT  0.99996361   +0 56 51.7
 HV7687;UTM  18      - 4,311,326.432   328,249.947   MT  0.99996324   -1 14 44.0
 HV7687
 HV7687!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7687!SPC MD       -   0.99999974  x   0.99995036  =   0.99995010
 HV7687!SPC VA N     -   0.99999974  x   0.99996361  =   0.99996335
 HV7687!UTM  18      -   0.99999974  x   0.99996324  =   0.99996298
 HV7687
 HV7687_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2824911326(NAD 83)
 HV7687
 HV7687                          SUPERSEDED SURVEY CONTROL
 HV7687
 HV7687  NAD 83(1991)-  38 56 02.62973(N)    076 58 53.48759(W) AD(       ) 2
 HV7687  NAD 83(1986)-  38 56 02.62871(N)    076 58 53.49782(W) AD(       ) 2
 HV7687  NAD 27      -  38 56 02.23080(N)    076 58 54.58330(W) AD(       ) 2
 HV7687
 HV7687.Superseded values are not recommended for survey control.
 HV7687
 HV7687.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7687.See file dsdata.pdf to determine how the superseded data were derived.
 HV7687
 HV7687_MARKER: Z = SEE DESCRIPTION
 HV7687_SETTING: 0 = UNSPECIFIED SETTING
 HV7687_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7687
 HV7687  HISTORY     - Date     Condition        Report By
 HV7687  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7687  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7687
 HV7687                          STATION DESCRIPTION
 HV7687
 HV7687'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7687'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7687
 HV7687                          STATION RECOVERY (1971)
 HV7687
 HV7687'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7687'STATION MARK WAS NOT FOUND.  A NEW CONCRETE SIDEWALK HAS BEEN
 HV7687'BUILT AND THE PIPE IS EITHER DESTROYED OR COVERED OVER.
 HV7687'
 HV7687'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7687'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7726 ***********************************************************************
 HV7726  DESIGNATION -  N E 138 E 1960
 HV7726  PID         -  HV7726
 HV7726  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7726  COUNTRY     -  US
 HV7726  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7726
 HV7726                         *CURRENT SURVEY CONTROL
 HV7726  ______________________________________________________________________
 HV7726* NAD 83(1993) POSITION- 38 56 02.94086(N) 076 58 46.57144(W)   ADJUSTED
 HV7726* NAVD 88 ORTHO HEIGHT -    27.    (meters)       89.    (feet) SCALED
 HV7726  ______________________________________________________________________
 HV7726  GEOID HEIGHT    -        -32.097 (meters)                     GEOID18
 HV7726  LAPLACE CORR    -         -4.25  (seconds)                    DEFLEC18
 HV7726  HORZ ORDER      -  SECOND
 HV7726
 HV7726.The horizontal coordinates were established by classical geodetic methods
 HV7726.and adjusted by the National Geodetic Survey in November 1994.
 HV7726
 HV7726.The orthometric height was scaled from a topographic map.
 HV7726
 HV7726.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7726.GEOID18 height accuracy estimate available here.
 HV7726
 HV7726.Click photographs - Photos may exist for this station.
 HV7726
 HV7726.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7726
 HV7726. The following values were computed from the NAD 83(1993) position.
 HV7726
 HV7726;                    North         East     Units Scale Factor Converg.
 HV7726;SPC MD       -   140,696.461   401,768.452   MT  0.99995036   +0 00 46.1
 HV7726;SPC MD       -   461,601.64  1,318,135.33   sFT  0.99995036   +0 00 46.1
 HV7726;SPC VA N     - 2,141,782.741 3,631,817.680   MT  0.99996362   +0 56 56.1
 HV7726;SPC VA N     - 7,026,832.21 11,915,388.51   sFT  0.99996362   +0 56 56.1
 HV7726;UTM  18      - 4,311,332.372   328,416.662   MT  0.99996253   -1 14 39.6
 HV7726
 HV7726!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7726!SPC MD       -   1.00000084  x   0.99995036  =   0.99995120
 HV7726!SPC VA N     -   1.00000084  x   0.99996362  =   0.99996446
 HV7726!UTM  18      -   1.00000084  x   0.99996253  =   0.99996337
 HV7726
 HV7726_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2841611332(NAD 83)
 HV7726
 HV7726                          SUPERSEDED SURVEY CONTROL
 HV7726
 HV7726  NAD 83(1991)-  38 56 02.93977(N)    076 58 46.57242(W) AD(       ) 2
 HV7726  NAD 83(1986)-  38 56 02.93874(N)    076 58 46.58265(W) AD(       ) 2
 HV7726  NAD 27      -  38 56 02.54090(N)    076 58 47.66810(W) AD(       ) 2
 HV7726
 HV7726.Superseded values are not recommended for survey control.
 HV7726
 HV7726.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7726.See file dsdata.pdf to determine how the superseded data were derived.
 HV7726
 HV7726_MARKER: Z = SEE DESCRIPTION
 HV7726_SETTING: 0 = UNSPECIFIED SETTING
 HV7726_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7726
 HV7726  HISTORY     - Date     Condition        Report By
 HV7726  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7726  HISTORY     - 1971     GOOD             NGS
 HV7726
 HV7726                          STATION DESCRIPTION
 HV7726
 HV7726'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7726'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7726
 HV7726                          STATION RECOVERY (1971)
 HV7726
 HV7726'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7726'STATION WAS RECOVERED AS DESCRIBED.  ORIGINAL DESCRIPTION IS
 HV7726'ADEQUATE.
 HV7726'
 HV7726'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7726'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7724 ***********************************************************************
 HV7724  DESIGNATION -  N E 138 F 1960
 HV7724  PID         -  HV7724
 HV7724  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7724  COUNTRY     -  US
 HV7724  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7724
 HV7724                         *CURRENT SURVEY CONTROL
 HV7724  ______________________________________________________________________
 HV7724* NAD 83(1993) POSITION- 38 56 02.96667(N) 076 58 36.35796(W)   ADJUSTED
 HV7724* NAVD 88 ORTHO HEIGHT -    26.    (meters)       85.    (feet) SCALED
 HV7724  ______________________________________________________________________
 HV7724  GEOID HEIGHT    -        -32.103 (meters)                     GEOID18
 HV7724  LAPLACE CORR    -         -4.34  (seconds)                    DEFLEC18
 HV7724  HORZ ORDER      -  SECOND
 HV7724
 HV7724.The horizontal coordinates were established by classical geodetic methods
 HV7724.and adjusted by the National Geodetic Survey in November 1994.
 HV7724
 HV7724.The orthometric height was scaled from a topographic map.
 HV7724
 HV7724.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7724.GEOID18 height accuracy estimate available here.
 HV7724
 HV7724.Click photographs - Photos may exist for this station.
 HV7724
 HV7724.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7724
 HV7724. The following values were computed from the NAD 83(1993) position.
 HV7724
 HV7724;                    North         East     Units Scale Factor Converg.
 HV7724;SPC MD       -   140,697.316   402,014.433   MT  0.99995036   +0 00 52.5
 HV7724;SPC MD       -   461,604.44  1,318,942.35   sFT  0.99995036   +0 00 52.5
 HV7724;SPC VA N     - 2,141,787.614 3,632,063.617   MT  0.99996362   +0 57 02.4
 HV7724;SPC VA N     - 7,026,848.20 11,916,195.38   sFT  0.99996362   +0 57 02.4
 HV7724;UTM  18      - 4,311,327.830   328,662.605   MT  0.99996150   -1 14 33.2
 HV7724
 HV7724!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7724!SPC MD       -   1.00000099  x   0.99995036  =   0.99995135
 HV7724!SPC VA N     -   1.00000099  x   0.99996362  =   0.99996461
 HV7724!UTM  18      -   1.00000099  x   0.99996150  =   0.99996249
 HV7724
 HV7724_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2866211327(NAD 83)
 HV7724
 HV7724                          SUPERSEDED SURVEY CONTROL
 HV7724
 HV7724  NAD 83(1991)-  38 56 02.96558(N)    076 58 36.35893(W) AD(       ) 2
 HV7724  NAD 83(1986)-  38 56 02.96453(N)    076 58 36.36916(W) AD(       ) 2
 HV7724  NAD 27      -  38 56 02.56670(N)    076 58 37.45480(W) AD(       ) 2
 HV7724
 HV7724.Superseded values are not recommended for survey control.
 HV7724
 HV7724.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7724.See file dsdata.pdf to determine how the superseded data were derived.
 HV7724
 HV7724_MARKER: Z = SEE DESCRIPTION
 HV7724_SETTING: 0 = UNSPECIFIED SETTING
 HV7724_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7724
 HV7724  HISTORY     - Date     Condition        Report By
 HV7724  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7724  HISTORY     - 1971     GOOD             NGS
 HV7724
 HV7724                          STATION DESCRIPTION
 HV7724
 HV7724'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7724'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7724
 HV7724                          STATION RECOVERY (1971)
 HV7724
 HV7724'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7724'STATION WAS RECOVERED IN GOOD CONDITION AS PREVIOUSLY
 HV7724'DESCRIBED.  ORIGINAL DESCRIPTION IS ADEQUATE.
 HV7724'
 HV7724'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7724'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7721 ***********************************************************************
 HV7721  DESIGNATION -  N E 140 A 1960
 HV7721  PID         -  HV7721
 HV7721  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7721  COUNTRY     -  US
 HV7721  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7721
 HV7721                         *CURRENT SURVEY CONTROL
 HV7721  ______________________________________________________________________
 HV7721* NAD 83(1993) POSITION- 38 55 01.99951(N) 076 58 50.76353(W)   ADJUSTED
 HV7721* NAVD 88 ORTHO HEIGHT -    27.    (meters)       89.    (feet) SCALED
 HV7721  ______________________________________________________________________
 HV7721  GEOID HEIGHT    -        -32.126 (meters)                     GEOID18
 HV7721  LAPLACE CORR    -         -4.30  (seconds)                    DEFLEC18
 HV7721  HORZ ORDER      -  SECOND
 HV7721
 HV7721.The horizontal coordinates were established by classical geodetic methods
 HV7721.and adjusted by the National Geodetic Survey in November 1994.
 HV7721
 HV7721.The orthometric height was scaled from a topographic map.
 HV7721
 HV7721.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7721.GEOID18 height accuracy estimate available here.
 HV7721
 HV7721.Click photographs - Photos may exist for this station.
 HV7721
 HV7721.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7721
 HV7721. The following values were computed from the NAD 83(1993) position.
 HV7721
 HV7721;                    North         East     Units Scale Factor Converg.
 HV7721;SPC MD       -   138,817.270   401,667.886   MT  0.99995011   +0 00 43.5
 HV7721;SPC MD       -   455,436.33  1,317,805.39   sFT  0.99995011   +0 00 43.5
 HV7721;SPC VA N     - 2,139,902.134 3,631,747.827   MT  0.99996203   +0 56 53.4
 HV7721;SPC VA N     - 7,020,662.25 11,915,159.33   sFT  0.99996203   +0 56 53.4
 HV7721;UTM  18      - 4,309,455.815   328,274.897   MT  0.99996314   -1 14 40.6
 HV7721
 HV7721!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7721!SPC MD       -   1.00000084  x   0.99995011  =   0.99995095
 HV7721!SPC VA N     -   1.00000084  x   0.99996203  =   0.99996287
 HV7721!UTM  18      -   1.00000084  x   0.99996314  =   0.99996398
 HV7721
 HV7721:                Primary Azimuth Mark                     Grid Az
 HV7721:SPC MD       -  NE 141 DCDHT                             088 32 34.5
 HV7721:SPC VA N     -  NE 141 DCDHT                             087 36 24.6
 HV7721:UTM  18      -  NE 141 DCDHT                             089 47 58.6
 HV7721
 HV7721_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2827409455(NAD 83)
 HV7721
 HV7721|---------------------------------------------------------------------|
 HV7721| PID    Reference Object                     Distance      Geod. Az  |
 HV7721|                                                           dddmmss.s |
 HV7721| HV1491 NE 141 DCDHT                        APPROX. 0.7 KM 0883318.0 |
 HV7721|---------------------------------------------------------------------|
 HV7721
 HV7721                          SUPERSEDED SURVEY CONTROL
 HV7721
 HV7721  NAD 83(1991)-  38 55 01.99840(N)    076 58 50.76459(W) AD(       ) 2
 HV7721  NAD 83(1986)-  38 55 01.99746(N)    076 58 50.77506(W) AD(       ) 2
 HV7721  NAD 27      -  38 55 01.59730(N)    076 58 51.86170(W) AD(       ) 2
 HV7721
 HV7721.Superseded values are not recommended for survey control.
 HV7721
 HV7721.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7721.See file dsdata.pdf to determine how the superseded data were derived.
 HV7721
 HV7721_MARKER: Z = SEE DESCRIPTION
 HV7721_SETTING: 0 = UNSPECIFIED SETTING
 HV7721_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7721
 HV7721  HISTORY     - Date     Condition        Report By
 HV7721  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7721  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7721
 HV7721                          STATION DESCRIPTION
 HV7721
 HV7721'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7721'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7721
 HV7721                          STATION RECOVERY (1971)
 HV7721
 HV7721'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7721'STATION HAS BEEN DESTROYED.  THE STREET HAS BEEN WIDENED, AND
 HV7721'THERE ARE NEW BUILDINGS HERE.
 HV7721'
 HV7721'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7721'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7707 ***********************************************************************
 HV7707  DESIGNATION -  N E 141 A 1960
 HV7707  PID         -  HV7707
 HV7707  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7707  COUNTRY     -  US
 HV7707  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7707
 HV7707                         *CURRENT SURVEY CONTROL
 HV7707  ______________________________________________________________________
 HV7707* NAD 83(1993) POSITION- 38 55 00.27526(N) 076 57 28.99422(W)   ADJUSTED
 HV7707* NAVD 88 ORTHO HEIGHT -    27.    (meters)       89.    (feet) SCALED
 HV7707  ______________________________________________________________________
 HV7707  GEOID HEIGHT    -        -32.180 (meters)                     GEOID18
 HV7707  LAPLACE CORR    -         -4.55  (seconds)                    DEFLEC18
 HV7707  HORZ ORDER      -  SECOND
 HV7707
 HV7707.The horizontal coordinates were established by classical geodetic methods
 HV7707.and adjusted by the National Geodetic Survey in November 1994.
 HV7707
 HV7707.The orthometric height was scaled from a topographic map.
 HV7707
 HV7707.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7707.GEOID18 height accuracy estimate available here.
 HV7707
 HV7707.Click photographs - Photos may exist for this station.
 HV7707
 HV7707.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7707
 HV7707. The following values were computed from the NAD 83(1993) position.
 HV7707
 HV7707;                    North         East     Units Scale Factor Converg.
 HV7707;SPC MD       -   138,764.761   403,637.708   MT  0.99995010   +0 01 34.8
 HV7707;SPC MD       -   455,264.05  1,324,268.05   sFT  0.99995010   +0 01 34.8
 HV7707;SPC VA N     - 2,139,881.813 3,633,718.268   MT  0.99996199   +0 57 44.5
 HV7707;SPC VA N     - 7,020,595.58 11,921,624.02   sFT  0.99996199   +0 57 44.5
 HV7707;UTM  18      - 4,309,360.118   330,243.112   MT  0.99995486   -1 13 49.2
 HV7707
 HV7707!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7707!SPC MD       -   1.00000085  x   0.99995010  =   0.99995095
 HV7707!SPC VA N     -   1.00000085  x   0.99996199  =   0.99996284
 HV7707!UTM  18      -   1.00000085  x   0.99995486  =   0.99995571
 HV7707
 HV7707:                Primary Azimuth Mark                     Grid Az
 HV7707:SPC MD       -  NE 141 DCDHT                             273 19 28.2
 HV7707:SPC VA N     -  NE 141 DCDHT                             272 23 18.5
 HV7707:UTM  18      -  NE 141 DCDHT                             274 34 52.2
 HV7707
 HV7707_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3024309360(NAD 83)
 HV7707
 HV7707|---------------------------------------------------------------------|
 HV7707| PID    Reference Object                     Distance      Geod. Az  |
 HV7707|                                                           dddmmss.s |
 HV7707| HV1490 NE 142 DCDHT                        303.538 METERS 05955     |
 HV7707| HV1491 NE 141 DCDHT                        APPROX. 1.2 KM 2732103.0 |
 HV7707|---------------------------------------------------------------------|
 HV7707
 HV7707                          SUPERSEDED SURVEY CONTROL
 HV7707
 HV7707  NAD 83(1991)-  38 55 00.27407(N)    076 57 28.99526(W) AD(       ) 2
 HV7707  NAD 83(1986)-  38 55 00.27304(N)    076 57 29.00572(W) AD(       ) 2
 HV7707  NAD 27      -  38 54 59.87240(N)    076 57 30.09640(W) AD(       ) 2
 HV7707
 HV7707.Superseded values are not recommended for survey control.
 HV7707
 HV7707.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7707.See file dsdata.pdf to determine how the superseded data were derived.
 HV7707
 HV7707_MARKER: Z = SEE DESCRIPTION
 HV7707_SETTING: 0 = UNSPECIFIED SETTING
 HV7707_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7707
 HV7707  HISTORY     - Date     Condition        Report By
 HV7707  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7707  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7707
 HV7707                          STATION DESCRIPTION
 HV7707
 HV7707'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7707'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7707
 HV7707                          STATION RECOVERY (1971)
 HV7707
 HV7707'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7707'STATION WAS NOT FOUND.  A NEW STREET CURB HAS BEEN BUILT IN THIS
 HV7707'AREA AND IT IS BELIEVED THE STATION IS DESTROYED.  THE 3 REFERENCE
 HV7707'POINTS WERE RECOVERED, HOWEVER.
 HV7707'
 HV7707'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7707'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7691 ***********************************************************************
 HV7691  DESIGNATION -  N E 143 A 1960
 HV7691  PID         -  HV7691
 HV7691  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7691  COUNTRY     -  US
 HV7691  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7691
 HV7691                         *CURRENT SURVEY CONTROL
 HV7691  ______________________________________________________________________
 HV7691* NAD 83(1993) POSITION- 38 53 45.56609(N) 076 59 37.91335(W)   ADJUSTED
 HV7691* NAVD 88 ORTHO HEIGHT -    23.    (meters)       75.    (feet) SCALED
 HV7691  ______________________________________________________________________
 HV7691  GEOID HEIGHT    -        -32.143 (meters)                     GEOID18
 HV7691  LAPLACE CORR    -         -3.73  (seconds)                    DEFLEC18
 HV7691  HORZ ORDER      -  SECOND
 HV7691
 HV7691.The horizontal coordinates were established by classical geodetic methods
 HV7691.and adjusted by the National Geodetic Survey in November 1994.
 HV7691
 HV7691.The orthometric height was scaled from a topographic map.
 HV7691
 HV7691.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7691.GEOID18 height accuracy estimate available here.
 HV7691
 HV7691.Click photographs - Photos may exist for this station.
 HV7691
 HV7691.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7691
 HV7691. The following values were computed from the NAD 83(1993) position.
 HV7691
 HV7691;                    North         East     Units Scale Factor Converg.
 HV7691;SPC MD       -   136,460.242   400,532.219   MT  0.99994991   +0 00 13.9
 HV7691;SPC MD       -   447,703.31  1,314,079.46   sFT  0.99994991   +0 00 13.9
 HV7691;SPC VA N     - 2,137,526.840 3,630,650.808   MT  0.99996017   +0 56 24.0
 HV7691;SPC VA N     - 7,012,869.31 11,911,560.19   sFT  0.99996017   +0 56 24.0
 HV7691;UTM  18      - 4,307,124.219   327,087.803   MT  0.99996817   -1 15 08.2
 HV7691
 HV7691!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7691!SPC MD       -   1.00000147  x   0.99994991  =   0.99995138
 HV7691!SPC VA N     -   1.00000147  x   0.99996017  =   0.99996164
 HV7691!UTM  18      -   1.00000147  x   0.99996817  =   0.99996964
 HV7691
 HV7691:                Primary Azimuth Mark                     Grid Az
 HV7691:SPC MD       -  NE 143 B                                 062 30 11.3
 HV7691:SPC VA N     -  NE 143 B                                 061 34 01.2
 HV7691:UTM  18      -  NE 143 B                                 063 45 33.4
 HV7691
 HV7691_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2708707124(NAD 83)
 HV7691
 HV7691|---------------------------------------------------------------------|
 HV7691| PID    Reference Object                     Distance      Geod. Az  |
 HV7691|                                                           dddmmss.s |
 HV7691| HV7700 NE 143 B                            457.178 METERS 0623025.2 |
 HV7691|---------------------------------------------------------------------|
 HV7691
 HV7691                          SUPERSEDED SURVEY CONTROL
 HV7691
 HV7691  NAD 83(1991)-  38 53 45.56486(N)    076 59 37.91448(W) AD(       ) 2
 HV7691  NAD 83(1986)-  38 53 45.56414(N)    076 59 37.92524(W) AD(       ) 2
 HV7691  NAD 27      -  38 53 45.16340(N)    076 59 39.00940(W) AD(       ) 2
 HV7691
 HV7691.Superseded values are not recommended for survey control.
 HV7691
 HV7691.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7691.See file dsdata.pdf to determine how the superseded data were derived.
 HV7691
 HV7691_MARKER: Z = SEE DESCRIPTION
 HV7691_SETTING: 0 = UNSPECIFIED SETTING
 HV7691_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7691
 HV7691  HISTORY     - Date     Condition        Report By
 HV7691  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7691  HISTORY     - 1971     GOOD             NGS
 HV7691
 HV7691                          STATION DESCRIPTION
 HV7691
 HV7691'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7691'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7691
 HV7691                          STATION RECOVERY (1971)
 HV7691
 HV7691'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7691'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED, IN A RED
 HV7691'BRICK SIDEWALK.  ORIGINAL DESCRIPTION IS ADEQUATE.
 HV7691'
 HV7691'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7691'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7690 ***********************************************************************
 HV7690  DESIGNATION -  N E 143 C 1960
 HV7690  PID         -  HV7690
 HV7690  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7690  COUNTRY     -  US
 HV7690  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7690
 HV7690                         *CURRENT SURVEY CONTROL
 HV7690  ______________________________________________________________________
 HV7690* NAD 83(1993) POSITION- 38 53 24.89943(N) 076 59 29.10545(W)   ADJUSTED
 HV7690* NAVD 88 ORTHO HEIGHT -    27.    (meters)       89.    (feet) SCALED
 HV7690  ______________________________________________________________________
 HV7690  GEOID HEIGHT    -        -32.159 (meters)                     GEOID18
 HV7690  LAPLACE CORR    -         -3.71  (seconds)                    DEFLEC18
 HV7690  HORZ ORDER      -  SECOND
 HV7690
 HV7690.The horizontal coordinates were established by classical geodetic methods
 HV7690.and adjusted by the National Geodetic Survey in November 1994.
 HV7690
 HV7690.The orthometric height was scaled from a topographic map.
 HV7690
 HV7690.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7690.GEOID18 height accuracy estimate available here.
 HV7690
 HV7690.Click photographs - Photos may exist for this station.
 HV7690
 HV7690.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7690
 HV7690. The following values were computed from the NAD 83(1993) position.
 HV7690
 HV7690;                    North         East     Units Scale Factor Converg.
 HV7690;SPC MD       -   135,822.992   400,744.522   MT  0.99994988   +0 00 19.4
 HV7690;SPC MD       -   445,612.60  1,314,775.99   sFT  0.99994988   +0 00 19.4
 HV7690;SPC VA N     - 2,136,893.137 3,630,873.497   MT  0.99995969   +0 56 29.5
 HV7690;SPC VA N     - 7,010,790.23 11,912,290.80   sFT  0.99995969   +0 56 29.5
 HV7690;UTM  18      - 4,306,482.456   327,286.090   MT  0.99996733   -1 15 02.1
 HV7690
 HV7690!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7690!SPC MD       -   1.00000085  x   0.99994988  =   0.99995073
 HV7690!SPC VA N     -   1.00000085  x   0.99995969  =   0.99996054
 HV7690!UTM  18      -   1.00000085  x   0.99996733  =   0.99996818
 HV7690
 HV7690:                Primary Azimuth Mark                     Grid Az
 HV7690:SPC MD       -  S E 143 D 1960                           179 58 13.1
 HV7690:SPC VA N     -  S E 143 D 1960                           179 02 03.0
 HV7690:UTM  18      -  S E 143 D 1960                           181 13 34.6
 HV7690
 HV7690_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2728606482(NAD 83)
 HV7690
 HV7690|---------------------------------------------------------------------|
 HV7690| PID    Reference Object                     Distance      Geod. Az  |
 HV7690|                                                           dddmmss.s |
 HV7690| HV7702 S E 143 D 1960                      APPROX. 0.9 KM 1795832.5 |
 HV7690|---------------------------------------------------------------------|
 HV7690
 HV7690                          SUPERSEDED SURVEY CONTROL
 HV7690
 HV7690  NAD 83(1991)-  38 53 24.89818(N)    076 59 29.10659(W) AD(       ) 2
 HV7690  NAD 83(1986)-  38 53 24.89745(N)    076 59 29.11734(W) AD(       ) 2
 HV7690  NAD 27      -  38 53 24.49660(N)    076 59 30.20140(W) AD(       ) 2
 HV7690
 HV7690.Superseded values are not recommended for survey control.
 HV7690
 HV7690.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7690.See file dsdata.pdf to determine how the superseded data were derived.
 HV7690
 HV7690_MARKER: Z = SEE DESCRIPTION
 HV7690_SETTING: 0 = UNSPECIFIED SETTING
 HV7690_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7690
 HV7690  HISTORY     - Date     Condition        Report By
 HV7690  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7690  HISTORY     - 1971     GOOD             NGS
 HV7690
 HV7690                          STATION DESCRIPTION
 HV7690
 HV7690'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7690'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7690
 HV7690                          STATION RECOVERY (1971)
 HV7690
 HV7690'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7690'STATION RECOVERED IN GOOD CONDITION.  CROSS CUT ON RIM OF
 HV7690'MANHOLE LOCATED ON SIDEWALK PLAINLY VISIBLE, CROSS CUTS ON MANHOLES
 HV7690'IN STREET AREA ARE WORN OFF AND NOT VISIBLE.  STATION IS AS
 HV7690'DESCRIBED AND IN A CRACK IN SIDEWALK PAVEMENT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7727 ***********************************************************************
 HV7727  DESIGNATION -  N E 144 A 1960
 HV7727  PID         -  HV7727
 HV7727  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7727  COUNTRY     -  US
 HV7727  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7727
 HV7727                         *CURRENT SURVEY CONTROL
 HV7727  ______________________________________________________________________
 HV7727* NAD 83(1993) POSITION- 38 53 57.31142(N) 076 58 45.31124(W)   ADJUSTED
 HV7727* NAVD 88 ORTHO HEIGHT -    14.    (meters)       46.    (feet) SCALED
 HV7727  ______________________________________________________________________
 HV7727  GEOID HEIGHT    -        -32.166 (meters)                     GEOID18
 HV7727  LAPLACE CORR    -         -4.03  (seconds)                    DEFLEC18
 HV7727  HORZ ORDER      -  SECOND
 HV7727
 HV7727.The horizontal coordinates were established by classical geodetic methods
 HV7727.and adjusted by the National Geodetic Survey in November 1994.
 HV7727
 HV7727.The orthometric height was scaled from a topographic map.
 HV7727
 HV7727.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7727.GEOID18 height accuracy estimate available here.
 HV7727
 HV7727.Click photographs - Photos may exist for this station.
 HV7727
 HV7727.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7727
 HV7727. The following values were computed from the NAD 83(1993) position.
 HV7727
 HV7727;                    North         East     Units Scale Factor Converg.
 HV7727;SPC MD       -   136,822.602   401,799.683   MT  0.99994993   +0 00 46.9
 HV7727;SPC MD       -   448,892.15  1,318,237.79   sFT  0.99994993   +0 00 46.9
 HV7727;SPC VA N     - 2,137,909.863 3,631,912.196   MT  0.99996044   +0 56 56.9
 HV7727;SPC VA N     - 7,014,125.94 11,915,698.60   sFT  0.99996044   +0 56 56.9
 HV7727;UTM  18      - 4,307,458.711   328,362.926   MT  0.99996276   -1 14 35.5
 HV7727
 HV7727!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7727!SPC MD       -   1.00000289  x   0.99994993  =   0.99995282
 HV7727!SPC VA N     -   1.00000289  x   0.99996044  =   0.99996333
 HV7727!UTM  18      -   1.00000289  x   0.99996276  =   0.99996565
 HV7727
 HV7727:                Primary Azimuth Mark                     Grid Az
 HV7727:SPC MD       -  NE 144 RESET                             282 36 11.3
 HV7727:SPC VA N     -  NE 144 RESET                             281 40 01.3
 HV7727:UTM  18      -  NE 144 RESET                             283 51 33.7
 HV7727
 HV7727_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2836207458(NAD 83)
 HV7727
 HV7727|---------------------------------------------------------------------|
 HV7727| PID    Reference Object                     Distance      Geod. Az  |
 HV7727|                                                           dddmmss.s |
 HV7727| HV7729 NE 144 A RESET                       17.151 METERS 10236     |
 HV7727| HV8044 NE 144 RESET                        411.842 METERS 2823658.2 |
 HV7727|---------------------------------------------------------------------|
 HV7727
 HV7727                          SUPERSEDED SURVEY CONTROL
 HV7727
 HV7727  NAD 83(1991)-  38 53 57.31017(N)    076 58 45.31235(W) AD(       ) 2
 HV7727  NAD 83(1986)-  38 53 57.30924(N)    076 58 45.32290(W) AD(       ) 2
 HV7727  NAD 27      -  38 53 56.90820(N)    076 58 46.40870(W) AD(       ) 2
 HV7727
 HV7727.Superseded values are not recommended for survey control.
 HV7727
 HV7727.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7727.See file dsdata.pdf to determine how the superseded data were derived.
 HV7727
 HV7727_MARKER: DS = TRIANGULATION STATION DISK
 HV7727_SETTING: 0 = UNSPECIFIED SETTING
 HV7727_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7727
 HV7727  HISTORY     - Date     Condition        Report By
 HV7727  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7727  HISTORY     - 1964     SEE DESCRIPTION  CGS
 HV7727  HISTORY     - 1971     SEE DESCRIPTION  NGS
 HV7727
 HV7727                          STATION DESCRIPTION
 HV7727
 HV7727'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7727'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV7727'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.E. 144-A
 HV7727'GROUTED IN CONCRETE SIDEWALK.
 HV7727
 HV7727                          STATION RECOVERY (1964)
 HV7727
 HV7727'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1964 (ELH)
 HV7727'THE STATION WAS REMOVED AT THE REQUEST OF THE DISTRICT SEWER
 HV7727'DEPARTMENT, DUE TO SEWER CONSTRUCTION.  BEFORE REMOVAL A NEW
 HV7727'STATION NE 144 A RESET 1964 WAS ESTABLISHED.
 HV7727
 HV7727                          STATION RECOVERY (1971)
 HV7727
 HV7727'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7727'STATION WAS NOT FOUND, AND IS BELIEVED TO BE DESTROYED, SINCE A
 HV7727'NEW SIDEWALK HAS BEEN CONSTRUCTED HERE.  ONLY 1 OF THE 3 REFERENCE
 HV7727'CROSSES WERE RECOVERED.  THE 2 ON THE MANHOLE RIMS IN THE STREET
 HV7727'HAVE BEEN WORN OFF BY TRAFFIC.
 HV7727'
 HV7727'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7727'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7718 ***********************************************************************
 HV7718  DESIGNATION -  N E 144 B 1960
 HV7718  PID         -  HV7718
 HV7718  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7718  COUNTRY     -  US
 HV7718  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7718
 HV7718                         *CURRENT SURVEY CONTROL
 HV7718  ______________________________________________________________________
 HV7718* NAD 83(1993) POSITION- 38 53 53.80910(N) 076 58 25.37828(W)   ADJUSTED
 HV7718* NAVD 88 ORTHO HEIGHT -    18.    (meters)       59.    (feet) SCALED
 HV7718  ______________________________________________________________________
 HV7718  GEOID HEIGHT    -        -32.180 (meters)                     GEOID18
 HV7718  LAPLACE CORR    -         -4.05  (seconds)                    DEFLEC18
 HV7718  HORZ ORDER      -  SECOND
 HV7718
 HV7718.The horizontal coordinates were established by classical geodetic methods
 HV7718.and adjusted by the National Geodetic Survey in November 1994.
 HV7718
 HV7718.The orthometric height was scaled from a topographic map.
 HV7718
 HV7718.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7718.GEOID18 height accuracy estimate available here.
 HV7718
 HV7718.Click photographs - Photos may exist for this station.
 HV7718
 HV7718.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7718
 HV7718. The following values were computed from the NAD 83(1993) position.
 HV7718
 HV7718;                    North         East     Units Scale Factor Converg.
 HV7718;SPC MD       -   136,714.730   402,280.014   MT  0.99994992   +0 00 59.4
 HV7718;SPC MD       -   448,538.24  1,319,813.68   sFT  0.99994992   +0 00 59.4
 HV7718;SPC VA N     - 2,137,809.852 3,632,394.231   MT  0.99996036   +0 57 09.3
 HV7718;SPC VA N     - 7,013,797.82 11,917,280.07   sFT  0.99996036   +0 57 09.3
 HV7718;UTM  18      - 4,307,340.333   328,840.783   MT  0.99996075   -1 14 22.8
 HV7718
 HV7718!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7718!SPC MD       -   1.00000226  x   0.99994992  =   0.99995218
 HV7718!SPC VA N     -   1.00000226  x   0.99996036  =   0.99996262
 HV7718!UTM  18      -   1.00000226  x   0.99996075  =   0.99996301
 HV7718
 HV7718_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2884007340(NAD 83)
 HV7718
 HV7718|---------------------------------------------------------------------|
 HV7718| PID    Reference Object                     Distance      Geod. Az  |
 HV7718|                                                           dddmmss.s |
 HV7718| HV1484 NE 144 C MADHOP                     378.509 METERS 10236     |
 HV7718|---------------------------------------------------------------------|
 HV7718
 HV7718                          SUPERSEDED SURVEY CONTROL
 HV7718
 HV7718  NAD 83(1991)-  38 53 53.80784(N)    076 58 25.37939(W) AD(       ) 2
 HV7718  NAD 83(1986)-  38 53 53.80694(N)    076 58 25.38992(W) AD(       ) 2
 HV7718  NAD 27      -  38 53 53.40600(N)    076 58 26.47660(W) AD(       ) 2
 HV7718
 HV7718.Superseded values are not recommended for survey control.
 HV7718
 HV7718.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7718.See file dsdata.pdf to determine how the superseded data were derived.
 HV7718
 HV7718_MARKER: Z = SEE DESCRIPTION
 HV7718_SETTING: 0 = UNSPECIFIED SETTING
 HV7718_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7718
 HV7718  HISTORY     - Date     Condition        Report By
 HV7718  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7718  HISTORY     - 1964     GOOD             CGS
 HV7718  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7718
 HV7718                          STATION DESCRIPTION
 HV7718
 HV7718'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7718'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7718
 HV7718                          STATION RECOVERY (1964)
 HV7718
 HV7718'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1964 (ELH)
 HV7718'THE STATION WAS RECOVERED AS DESCRIBED AND FOUND TO BE IN GOOD
 HV7718'CONDITION.
 HV7718
 HV7718                          STATION RECOVERY (1971)
 HV7718
 HV7718'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7718'STATION MARK HAS BEEN DESTROYED BY CONSTRUCTION OF A NEW
 HV7718'DRIVEWAY.  THE REFERENCE CROSS TO NORTHEAST HAS BEEN WORN OFF BY
 HV7718'TRAFFIC, BUT THE OTHER 2 REFERENCE POINTS WERE RECOVERED, AND AT
 HV7718'THE INTERSECTION OF THE PUBLISHED DISTANCES FROM THESE 2 A YELLOW
 HV7718'CROSS WAS FOUND PAINTED ON THE CONCRETE.
 HV7718'
 HV7718'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7718'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7709 ***********************************************************************
 HV7709  DESIGNATION -  N E 145 A 1960
 HV7709  PID         -  HV7709
 HV7709  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7709  COUNTRY     -  US
 HV7709  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7709
 HV7709                         *CURRENT SURVEY CONTROL
 HV7709  ______________________________________________________________________
 HV7709* NAD 83(1993) POSITION- 38 53 49.16417(N) 076 57 39.29803(W)   ADJUSTED
 HV7709* NAVD 88 ORTHO HEIGHT -     3.    (meters)       10.    (feet) SCALED
 HV7709  ______________________________________________________________________
 HV7709  GEOID HEIGHT    -        -32.209 (meters)                     GEOID18
 HV7709  LAPLACE CORR    -         -3.95  (seconds)                    DEFLEC18
 HV7709  HORZ ORDER      -  SECOND
 HV7709
 HV7709.The horizontal coordinates were established by classical geodetic methods
 HV7709.and adjusted by the National Geodetic Survey in November 1994.
 HV7709
 HV7709.The orthometric height was scaled from a topographic map.
 HV7709
 HV7709.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7709.GEOID18 height accuracy estimate available here.
 HV7709
 HV7709.Click photographs - Photos may exist for this station.
 HV7709
 HV7709.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7709
 HV7709. The following values were computed from the NAD 83(1993) position.
 HV7709
 HV7709;                    North         East     Units Scale Factor Converg.
 HV7709;SPC MD       -   136,571.898   403,390.430   MT  0.99994992   +0 01 28.3
 HV7709;SPC MD       -   448,069.64  1,323,456.77   sFT  0.99994992   +0 01 28.3
 HV7709;SPC VA N     - 2,137,685.179 3,633,506.843   MT  0.99996025   +0 57 38.1
 HV7709;SPC VA N     - 7,013,388.79 11,920,930.37   sFT  0.99996025   +0 57 38.1
 HV7709;UTM  18      - 4,307,173.192   329,947.809   MT  0.99995610   -1 13 53.8
 HV7709
 HV7709!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7709!SPC MD       -   1.00000462  x   0.99994992  =   0.99995454
 HV7709!SPC VA N     -   1.00000462  x   0.99996025  =   0.99996487
 HV7709!UTM  18      -   1.00000462  x   0.99995610  =   0.99996072
 HV7709
 HV7709:                Primary Azimuth Mark                     Grid Az
 HV7709:SPC MD       -  N E 145 B 1960                           099 04 41.2
 HV7709:SPC VA N     -  N E 145 B 1960                           098 08 31.4
 HV7709:UTM  18      -  N E 145 B 1960                           100 20 03.3
 HV7709
 HV7709_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2994707173(NAD 83)
 HV7709
 HV7709|---------------------------------------------------------------------|
 HV7709| PID    Reference Object                     Distance      Geod. Az  |
 HV7709|                                                           dddmmss.s |
 HV7709| HV7713 N E 145 B 1960                      APPROX. 0.5 KM 0990609.5 |
 HV7709| HV1483 NE 145 DCDHT                        433.357 METERS 2735205.8 |
 HV7709|---------------------------------------------------------------------|
 HV7709
 HV7709                          SUPERSEDED SURVEY CONTROL
 HV7709
 HV7709  NAD 83(1991)-  38 53 49.16288(N)    076 57 39.29915(W) AD(       ) 2
 HV7709  NAD 83(1986)-  38 53 49.16199(N)    076 57 39.30966(W) AD(       ) 2
 HV7709  NAD 27      -  38 53 48.76130(N)    076 57 40.39830(W) AD(       ) 2
 HV7709
 HV7709.Superseded values are not recommended for survey control.
 HV7709
 HV7709.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7709.See file dsdata.pdf to determine how the superseded data were derived.
 HV7709
 HV7709_MARKER: DS = TRIANGULATION STATION DISK
 HV7709_SETTING: 0 = UNSPECIFIED SETTING
 HV7709_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7709
 HV7709  HISTORY     - Date     Condition        Report By
 HV7709  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7709  HISTORY     - 1969     GOOD             CGS
 HV7709  HISTORY     - 1971     GOOD             NGS
 HV7709  HISTORY     - 1976     MARK NOT FOUND   NGS
 HV7709
 HV7709                          STATION DESCRIPTION
 HV7709
 HV7709'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7709'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV7709'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.E. 145-A
 HV7709'GROUTED IN CONCRETE MEDIAN STRIP.
 HV7709
 HV7709                          STATION RECOVERY (1969)
 HV7709
 HV7709'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1969 (EBK)
 HV7709'STATION MARK WAS FOUND IN GOOD CONDITION AND AS DESCRIBED IN 1960
 HV7709'DESCRIPTIONS BY C. J. MADDOX.
 HV7709
 HV7709                          STATION RECOVERY (1971)
 HV7709
 HV7709'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7709'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE ORIGINAL
 HV7709'DESCRIPTION IS ADEQUATE.
 HV7709'
 HV7709'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7709'IN DISTRICT OF COLUMBIA.
 HV7709
 HV7709                          STATION RECOVERY (1976)
 HV7709
 HV7709'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1976 (CLN)
 HV7709'A SEARCH FOR THE STATION WAS CONDUCTED AND NO EVIDENCE OF THE
 HV7709'STATION COULD BE FOUND.  IT IS BELIEVED THE STATION AND THE
 HV7709'REFERENCE POINTS WERE DESTROYED DURING CONSTRUCTION IN THE AREA
 HV7709'OF THE STATION.
 HV7709'
 HV7709'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7709'IN THE NE PART OF THE DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7713 ***********************************************************************
 HV7713  DESIGNATION -  N E 145 B 1960
 HV7713  PID         -  HV7713
 HV7713  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7713  COUNTRY     -  US
 HV7713  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7713
 HV7713                         *CURRENT SURVEY CONTROL
 HV7713  ______________________________________________________________________
 HV7713* NAD 83(1993) POSITION- 38 53 46.36240(N) 076 57 16.92562(W)   ADJUSTED
 HV7713* NAVD 88 ORTHO HEIGHT -    12.    (meters)       39.    (feet) SCALED
 HV7713  ______________________________________________________________________
 HV7713  GEOID HEIGHT    -        -32.222 (meters)                     GEOID18
 HV7713  LAPLACE CORR    -         -3.88  (seconds)                    DEFLEC18
 HV7713  HORZ ORDER      -  SECOND
 HV7713
 HV7713.The horizontal coordinates were established by classical geodetic methods
 HV7713.and adjusted by the National Geodetic Survey in November 1994.
 HV7713
 HV7713.The orthometric height was scaled from a topographic map.
 HV7713
 HV7713.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7713.GEOID18 height accuracy estimate available here.
 HV7713
 HV7713.Click photographs - Photos may exist for this station.
 HV7713
 HV7713.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7713
 HV7713. The following values were computed from the NAD 83(1993) position.
 HV7713
 HV7713;                    North         East     Units Scale Factor Converg.
 HV7713;SPC MD       -   136,485.753   403,929.570   MT  0.99994991   +0 01 42.4
 HV7713;SPC MD       -   447,787.01  1,325,225.60   sFT  0.99994991   +0 01 42.4
 HV7713;SPC VA N     - 2,137,607.852 3,634,047.324   MT  0.99996019   +0 57 52.0
 HV7713;SPC VA N     - 7,013,135.09 11,922,703.60   sFT  0.99996019   +0 57 52.0
 HV7713;UTM  18      - 4,307,075.248   330,484.935   MT  0.99995385   -1 13 39.6
 HV7713
 HV7713!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7713!SPC MD       -   1.00000321  x   0.99994991  =   0.99995312
 HV7713!SPC VA N     -   1.00000321  x   0.99996019  =   0.99996340
 HV7713!UTM  18      -   1.00000321  x   0.99995385  =   0.99995706
 HV7713
 HV7713:                Primary Azimuth Mark                     Grid Az
 HV7713:SPC MD       -  N E 145 A 1960                           279 04 41.1
 HV7713:SPC VA N     -  N E 145 A 1960                           278 08 31.5
 HV7713:UTM  18      -  N E 145 A 1960                           280 20 03.1
 HV7713
 HV7713_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3048407075(NAD 83)
 HV7713
 HV7713|---------------------------------------------------------------------|
 HV7713| PID    Reference Object                     Distance      Geod. Az  |
 HV7713|                                                           dddmmss.s |
 HV7713| HV1482 NE 146                              265.426 METERS 09927     |
 HV7713| HV7709 N E 145 A 1960                      APPROX. 0.5 KM 2790623.5 |
 HV7713|---------------------------------------------------------------------|
 HV7713
 HV7713                          SUPERSEDED SURVEY CONTROL
 HV7713
 HV7713  NAD 83(1991)-  38 53 46.36110(N)    076 57 16.92674(W) AD(       ) 2
 HV7713  NAD 83(1986)-  38 53 46.36020(N)    076 57 16.93726(W) AD(       ) 2
 HV7713  NAD 27      -  38 53 45.95960(N)    076 57 18.02680(W) AD(       ) 2
 HV7713
 HV7713.Superseded values are not recommended for survey control.
 HV7713
 HV7713.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7713.See file dsdata.pdf to determine how the superseded data were derived.
 HV7713
 HV7713_MARKER: Z = SEE DESCRIPTION
 HV7713_SETTING: 0 = UNSPECIFIED SETTING
 HV7713_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7713
 HV7713  HISTORY     - Date     Condition        Report By
 HV7713  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7713  HISTORY     - 1971     GOOD             NGS
 HV7713  HISTORY     - 1976     MARK NOT FOUND   NGS
 HV7713
 HV7713                          STATION DESCRIPTION
 HV7713
 HV7713'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7713'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7713
 HV7713                          STATION RECOVERY (1971)
 HV7713
 HV7713'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7713'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE ORIGINAL
 HV7713'DESCRIPTION IS ADEQUATE, WITH THE FOLLOWING ADDITIONS--STATION IS
 HV7713'8.1 FEET SOUTHWEST OF A WIRE MESH FENCE AND 65.7 FEET NORTHWEST
 HV7713'OF A POWER POLE.
 HV7713'
 HV7713'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7713'IN DISTRICT OF COLUMBIA.
 HV7713
 HV7713                          STATION RECOVERY (1976)
 HV7713
 HV7713'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1976 (CLN)
 HV7713'A SEARCH WAS CONDUCTED FOR THE STATION AND NO EVIDENCE OF IT WAS
 HV7713'FOUND.  IT IS BELIEVED THE STATION AND ALL REFERENCE POINTS WERE
 HV7713'DESTROYED DURING CONSTRUCTION IN THE AREA OF THE STATION.
 HV7713'
 HV7713'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7713'IN THE NE PART OF THE DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7665 ***********************************************************************
 HV7665  DESIGNATION -  N E 146 A 1960
 HV7665  PID         -  HV7665
 HV7665  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7665  COUNTRY     -  US
 HV7665  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7665
 HV7665                         *CURRENT SURVEY CONTROL
 HV7665  ______________________________________________________________________
 HV7665* NAD 83(1993) POSITION- 38 53 55.55344(N) 076 56 53.60666(W)   ADJUSTED
 HV7665* NAVD 88 ORTHO HEIGHT -    14.    (meters)       46.    (feet) SCALED
 HV7665  ______________________________________________________________________
 HV7665  GEOID HEIGHT    -        -32.232 (meters)                     GEOID18
 HV7665  LAPLACE CORR    -         -3.99  (seconds)                    DEFLEC18
 HV7665  HORZ ORDER      -  SECOND
 HV7665
 HV7665.The horizontal coordinates were established by classical geodetic methods
 HV7665.and adjusted by the National Geodetic Survey in November 1994.
 HV7665
 HV7665.The orthometric height was scaled from a topographic map.
 HV7665
 HV7665.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7665.GEOID18 height accuracy estimate available here.
 HV7665
 HV7665.Click photographs - Photos may exist for this station.
 HV7665
 HV7665.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7665
 HV7665. The following values were computed from the NAD 83(1993) position.
 HV7665
 HV7665;                    North         East     Units Scale Factor Converg.
 HV7665;SPC MD       -   136,769.463   404,491.322   MT  0.99994993   +0 01 57.0
 HV7665;SPC MD       -   448,717.81  1,327,068.61   sFT  0.99994993   +0 01 57.0
 HV7665;SPC VA N     - 2,137,900.703 3,634,604.372   MT  0.99996040   +0 58 06.6
 HV7665;SPC VA N     - 7,014,095.89 11,924,531.18   sFT  0.99996040   +0 58 06.6
 HV7665;UTM  18      - 4,307,346.576   331,052.772   MT  0.99995148   -1 13 25.2
 HV7665
 HV7665!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7665!SPC MD       -   1.00000290  x   0.99994993  =   0.99995283
 HV7665!SPC VA N     -   1.00000290  x   0.99996040  =   0.99996330
 HV7665!UTM  18      -   1.00000290  x   0.99995148  =   0.99995438
 HV7665
 HV7665:                Primary Azimuth Mark                     Grid Az
 HV7665:SPC MD       -  N E 146 B 1960                           045 01 13.7
 HV7665:SPC VA N     -  N E 146 B 1960                           044 05 04.1
 HV7665:UTM  18      -  N E 146 B 1960                           046 16 35.9
 HV7665
 HV7665_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3105207346(NAD 83)
 HV7665
 HV7665|---------------------------------------------------------------------|
 HV7665| PID    Reference Object                     Distance      Geod. Az  |
 HV7665|                                                           dddmmss.s |
 HV7665| HV7669 N E 146 B 1960                      APPROX. 0.5 KM 0450310.7 |
 HV7665| HV1482 NE 146                              443.871 METERS 2223236.9 |
 HV7665|---------------------------------------------------------------------|
 HV7665
 HV7665                          SUPERSEDED SURVEY CONTROL
 HV7665
 HV7665  NAD 83(1991)-  38 53 55.55214(N)    076 56 53.60775(W) AD(       ) 2
 HV7665  NAD 83(1986)-  38 53 55.55119(N)    076 56 53.61828(W) AD(       ) 2
 HV7665  NAD 27      -  38 53 55.15060(N)    076 56 54.70900(W) AD(       ) 2
 HV7665
 HV7665.Superseded values are not recommended for survey control.
 HV7665
 HV7665.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7665.See file dsdata.pdf to determine how the superseded data were derived.
 HV7665
 HV7665_MARKER: DS = TRIANGULATION STATION DISK
 HV7665_SETTING: 0 = UNSPECIFIED SETTING
 HV7665_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7665
 HV7665  HISTORY     - Date     Condition        Report By
 HV7665  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7665  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7665  HISTORY     - 1976     MARK NOT FOUND   NGS
 HV7665
 HV7665                          STATION DESCRIPTION
 HV7665
 HV7665'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7665'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV7665'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.E. 146-A
 HV7665'GROUTED IN CONCRETE CURB.
 HV7665
 HV7665                          STATION RECOVERY (1971)
 HV7665
 HV7665'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7665'THE STATION COULD NOT BE RECOVERED AND IS BELIEVED LOST.  APPARENTLY
 HV7665'DESTROYED WHEN NEW MEDIAN STRIP WAS PUT IN.
 HV7665
 HV7665                          STATION RECOVERY (1976)
 HV7665
 HV7665'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1976 (CLN)
 HV7665'A SEARCH WAS MADE FOR THE STATION AND NO EVIDENCE OF IT WAS
 HV7665'FOUND.  THE REFERENCE POINTS WERE ALSO DESTROYED BY THE TRAFFIC
 HV7665'ALONG THE STREET.  THIS STATION WAS NOT FOUND AND BELIEVED LOST
 HV7665'AS PREVIOUSLY REPORTED.
 HV7665'
 HV7665'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7665'IN THE NE PART OF THE DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7669 ***********************************************************************
 HV7669  DESIGNATION -  N E 146 B 1960
 HV7669  PID         -  HV7669
 HV7669  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7669  COUNTRY     -  US
 HV7669  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7669
 HV7669                         *CURRENT SURVEY CONTROL
 HV7669  ______________________________________________________________________
 HV7669* NAD 83(1993) POSITION- 38 54 07.22095(N) 076 56 38.64710(W)   ADJUSTED
 HV7669* NAVD 88 ORTHO HEIGHT -     9.    (meters)       30.    (feet) SCALED
 HV7669  ______________________________________________________________________
 HV7669  GEOID HEIGHT    -        -32.236 (meters)                     GEOID18
 HV7669  LAPLACE CORR    -         -4.13  (seconds)                    DEFLEC18
 HV7669  HORZ ORDER      -  SECOND
 HV7669
 HV7669.The horizontal coordinates were established by classical geodetic methods
 HV7669.and adjusted by the National Geodetic Survey in November 1994.
 HV7669
 HV7669.The orthometric height was scaled from a topographic map.
 HV7669
 HV7669.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7669.GEOID18 height accuracy estimate available here.
 HV7669
 HV7669.Click photographs - Photos may exist for this station.
 HV7669
 HV7669.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7669
 HV7669. The following values were computed from the NAD 83(1993) position.
 HV7669
 HV7669;                    North         East     Units Scale Factor Converg.
 HV7669;SPC MD       -   137,129.450   404,851.566   MT  0.99994995   +0 02 06.4
 HV7669;SPC MD       -   449,898.87  1,328,250.51   sFT  0.99994995   +0 02 06.4
 HV7669;SPC VA N     - 2,138,266.530 3,634,958.691   MT  0.99996068   +0 58 15.9
 HV7669;SPC VA N     - 7,015,296.11 11,925,693.64   sFT  0.99996068   +0 58 15.9
 HV7669;UTM  18      - 4,307,698.579   331,420.822   MT  0.99994995   -1 13 16.1
 HV7669
 HV7669!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7669!SPC MD       -   1.00000368  x   0.99994995  =   0.99995363
 HV7669!SPC VA N     -   1.00000368  x   0.99996068  =   0.99996436
 HV7669!UTM  18      -   1.00000368  x   0.99994995  =   0.99995363
 HV7669
 HV7669:                Primary Azimuth Mark                     Grid Az
 HV7669:SPC MD       -  N E 146 C 1960                           040 44 27.1
 HV7669:SPC VA N     -  N E 146 C 1960                           039 48 17.6
 HV7669:UTM  18      -  N E 146 C 1960                           041 59 49.6
 HV7669
 HV7669_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3142007698(NAD 83)
 HV7669
 HV7669|---------------------------------------------------------------------|
 HV7669| PID    Reference Object                     Distance      Geod. Az  |
 HV7669|                                                           dddmmss.s |
 HV7669| HV7656 N E 146 C 1960                      APPROX. 0.7 KM 0404633.5 |
 HV7669| HV7665 N E 146 A 1960                      APPROX. 0.5 KM 2250320.1 |
 HV7669|---------------------------------------------------------------------|
 HV7669
 HV7669                          SUPERSEDED SURVEY CONTROL
 HV7669
 HV7669  NAD 83(1991)-  38 54 07.21965(N)    076 56 38.64817(W) AD(       ) 2
 HV7669  NAD 83(1986)-  38 54 07.21867(N)    076 56 38.65870(W) AD(       ) 2
 HV7669  NAD 27      -  38 54 06.81800(N)    076 56 39.75040(W) AD(       ) 2
 HV7669
 HV7669.Superseded values are not recommended for survey control.
 HV7669
 HV7669.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7669.See file dsdata.pdf to determine how the superseded data were derived.
 HV7669
 HV7669_MARKER: DS = TRIANGULATION STATION DISK
 HV7669_SETTING: 0 = UNSPECIFIED SETTING
 HV7669_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7669
 HV7669  HISTORY     - Date     Condition        Report By
 HV7669  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7669  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7669
 HV7669                          STATION DESCRIPTION
 HV7669
 HV7669'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7669'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV7669'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.E. 146-B
 HV7669'GROUTED IN CONCRETE CURB.
 HV7669
 HV7669                          STATION RECOVERY (1971)
 HV7669
 HV7669'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7669'STATION WAS NOT RECOVERED AND SHOULD BE CONSIDERED LOST.  A TWO
 HV7669'HOUR SEARCH REVEALED NO SIGN OF THE MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7656 ***********************************************************************
 HV7656  DESIGNATION -  N E 146 C 1960
 HV7656  PID         -  HV7656
 HV7656  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7656  COUNTRY     -  US
 HV7656  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7656
 HV7656                         *CURRENT SURVEY CONTROL
 HV7656  ______________________________________________________________________
 HV7656* NAD 83(1993) POSITION- 38 54 23.41647(N) 076 56 20.77021(W)   ADJUSTED
 HV7656* NAVD 88 ORTHO HEIGHT -    11.    (meters)       36.    (feet) SCALED
 HV7656  ______________________________________________________________________
 HV7656  GEOID HEIGHT    -        -32.241 (meters)                     GEOID18
 HV7656  LAPLACE CORR    -         -4.34  (seconds)                    DEFLEC18
 HV7656  HORZ ORDER      -  SECOND
 HV7656
 HV7656.The horizontal coordinates were established by classical geodetic methods
 HV7656.and adjusted by the National Geodetic Survey in November 1994.
 HV7656
 HV7656.The orthometric height was scaled from a topographic map.
 HV7656
 HV7656.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7656.GEOID18 height accuracy estimate available here.
 HV7656
 HV7656.Click photographs - Photos may exist for this station.
 HV7656
 HV7656.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7656
 HV7656. The following values were computed from the NAD 83(1993) position.
 HV7656
 HV7656;                    North         East     Units Scale Factor Converg.
 HV7656;SPC MD       -   137,629.124   405,281.973   MT  0.99994999   +0 02 17.6
 HV7656;SPC MD       -   451,538.22  1,329,662.61   sFT  0.99994999   +0 02 17.6
 HV7656;SPC VA N     - 2,138,773.174 3,635,380.884   MT  0.99996107   +0 58 27.1
 HV7656;SPC VA N     - 7,016,958.32 11,927,078.78   sFT  0.99996107   +0 58 27.1
 HV7656;UTM  18      - 4,308,188.695   331,862.081   MT  0.99994812   -1 13 05.3
 HV7656
 HV7656!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7656!SPC MD       -   1.00000337  x   0.99994999  =   0.99995336
 HV7656!SPC VA N     -   1.00000337  x   0.99996107  =   0.99996444
 HV7656!UTM  18      -   1.00000337  x   0.99994812  =   0.99995149
 HV7656
 HV7656:                Primary Azimuth Mark                     Grid Az
 HV7656:SPC MD       -  NE 147 DCDHT                             035 31 46.3
 HV7656:SPC VA N     -  NE 147 DCDHT                             034 35 36.8
 HV7656:UTM  18      -  NE 147 DCDHT                             036 47 09.2
 HV7656
 HV7656_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3186208188(NAD 83)
 HV7656
 HV7656|---------------------------------------------------------------------|
 HV7656| PID    Reference Object                     Distance      Geod. Az  |
 HV7656|                                                           dddmmss.s |
 HV7656| HV1481 NE 147 DCDHT                        APPROX. 0.6 KM 0353403.9 |
 HV7656|---------------------------------------------------------------------|
 HV7656
 HV7656                          SUPERSEDED SURVEY CONTROL
 HV7656
 HV7656  NAD 83(1991)-  38 54 23.41517(N)    076 56 20.77126(W) AD(       ) 2
 HV7656  NAD 83(1986)-  38 54 23.41415(N)    076 56 20.78178(W) AD(       ) 2
 HV7656  NAD 27      -  38 54 23.01350(N)    076 56 21.87450(W) AD(       ) 2
 HV7656
 HV7656.Superseded values are not recommended for survey control.
 HV7656
 HV7656.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7656.See file dsdata.pdf to determine how the superseded data were derived.
 HV7656
 HV7656_MARKER: DS = TRIANGULATION STATION DISK
 HV7656_SETTING: 0 = UNSPECIFIED SETTING
 HV7656_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7656
 HV7656  HISTORY     - Date     Condition        Report By
 HV7656  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7656  HISTORY     - 1971     GOOD             NGS
 HV7656  HISTORY     - 1972     GOOD             NGS
 HV7656
 HV7656                          STATION DESCRIPTION
 HV7656
 HV7656'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7656'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV7656'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.E. 146-C
 HV7656'GROUTED IN CONCRETE RAMP.
 HV7656
 HV7656                          STATION RECOVERY (1971)
 HV7656
 HV7656'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7656'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE
 HV7656'ORIGINAL DESCRIPTION IS ADEQUATE, EXCEPT THAT THE PEDESTRIAN
 HV7656'OVERPASS IS NOW COVERED OVER WITH A GREEN WIRE MESH FENCE.
 HV7656'
 HV7656'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7656'IN DISTRICT OF COLUMBIA.
 HV7656
 HV7656                          STATION RECOVERY (1972)
 HV7656
 HV7656'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1972 (RDO)
 HV7656'RECOVERED IN GOOD CONDITION AS DESCRIBED IN 1960 AND 1971.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7705 ***********************************************************************
 HV7705  DESIGNATION -  N E 146 D 1960
 HV7705  PID         -  HV7705
 HV7705  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7705  COUNTRY     -  US
 HV7705  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7705
 HV7705                         *CURRENT SURVEY CONTROL
 HV7705  ______________________________________________________________________
 HV7705* NAD 83(1993) POSITION- 38 53 32.03938(N) 076 57 20.16780(W)   ADJUSTED
 HV7705* NAVD 88 ORTHO HEIGHT -    12.    (meters)       39.    (feet) SCALED
 HV7705  ______________________________________________________________________
 HV7705  GEOID HEIGHT    -        -32.226 (meters)                     GEOID18
 HV7705  LAPLACE CORR    -         -3.74  (seconds)                    DEFLEC18
 HV7705  HORZ ORDER      -  SECOND
 HV7705
 HV7705.The horizontal coordinates were established by classical geodetic methods
 HV7705.and adjusted by the National Geodetic Survey in November 1994.
 HV7705
 HV7705.The orthometric height was scaled from a topographic map.
 HV7705
 HV7705.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7705.GEOID18 height accuracy estimate available here.
 HV7705
 HV7705.Click photographs - Photos may exist for this station.
 HV7705
 HV7705.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7705
 HV7705. The following values were computed from the NAD 83(1993) position.
 HV7705
 HV7705;                    North         East     Units Scale Factor Converg.
 HV7705;SPC MD       -   136,044.057   403,851.659   MT  0.99994989   +0 01 40.3
 HV7705;SPC MD       -   446,337.88  1,324,969.98   sFT  0.99994989   +0 01 40.3
 HV7705;SPC VA N     - 2,137,164.937 3,633,976.638   MT  0.99995985   +0 57 50.0
 HV7705;SPC VA N     - 7,011,681.96 11,922,471.69   sFT  0.99995985   +0 57 50.0
 HV7705;UTM  18      - 4,306,635.364   330,397.359   MT  0.99995422   -1 13 41.3
 HV7705
 HV7705!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7705!SPC MD       -   1.00000321  x   0.99994989  =   0.99995310
 HV7705!SPC VA N     -   1.00000321  x   0.99995985  =   0.99996306
 HV7705!UTM  18      -   1.00000321  x   0.99995422  =   0.99995743
 HV7705
 HV7705:                Primary Azimuth Mark                     Grid Az
 HV7705:SPC MD       -  SE 155 DCDHT RESET                       228 35 12.1
 HV7705:SPC VA N     -  SE 155 DCDHT RESET                       227 39 02.4
 HV7705:UTM  18      -  SE 155 DCDHT RESET                       229 50 33.7
 HV7705
 HV7705_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3039706635(NAD 83)
 HV7705
 HV7705|---------------------------------------------------------------------|
 HV7705| PID    Reference Object                     Distance      Geod. Az  |
 HV7705|                                                           dddmmss.s |
 HV7705| HV1482 NE 146                              APPROX. 0.5 KM 0402947.7 |
 HV7705| HV1463 SE 155 DCDHT RESET                  APPROX. 0.5 KM 2283652.4 |
 HV7705|---------------------------------------------------------------------|
 HV7705
 HV7705                          SUPERSEDED SURVEY CONTROL
 HV7705
 HV7705  NAD 83(1991)-  38 53 32.03806(N)    076 57 20.16892(W) AD(       ) 2
 HV7705  NAD 83(1986)-  38 53 32.03717(N)    076 57 20.17949(W) AD(       ) 2
 HV7705  NAD 27      -  38 53 31.63680(N)    076 57 21.26860(W) AD(       ) 2
 HV7705
 HV7705.Superseded values are not recommended for survey control.
 HV7705
 HV7705.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7705.See file dsdata.pdf to determine how the superseded data were derived.
 HV7705
 HV7705_MARKER: Z = SEE DESCRIPTION
 HV7705_SETTING: 0 = UNSPECIFIED SETTING
 HV7705_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7705
 HV7705  HISTORY     - Date     Condition        Report By
 HV7705  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7705  HISTORY     - 1968     GOOD             CGS
 HV7705
 HV7705                          STATION DESCRIPTION
 HV7705
 HV7705'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7705'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7705
 HV7705                          STATION RECOVERY (1968)
 HV7705
 HV7705'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1968 (JCB)
 HV7705'STATION WAS RECOVERED AND ALL MARKS EXCEPT THE CROSS IN THE LAMP
 HV7705'POST BASE TO THE SOUTH WERE FOUND TO BE IN GOOD CONDITION.  THIS
 HV7705'BASE WAS REPLACED IN WHOLE OR IN PART WHICH APPARENTLY DESTROYED
 HV7705'MARK.  ALTHOUGH THIS OFFICE WAS REQUESTED TO RELOCATE THIS STATION
 HV7705'BECAUSE OF THE TRAFFIC PROBLEM THIS WOULD BE IMPOSSIBLE WITH THE
 HV7705'NUMBER OF PERSONNEL AVAILABLE.
 HV7705'
 HV7705'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7705'IN NORTHEAST PART OF D.C.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7659 ***********************************************************************
 HV7659  DESIGNATION -  N E 147 A 1960
 HV7659  PID         -  HV7659
 HV7659  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7659  COUNTRY     -  US
 HV7659  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7659
 HV7659                         *CURRENT SURVEY CONTROL
 HV7659  ______________________________________________________________________
 HV7659* NAD 83(1993) POSITION- 38 54 34.54131(N) 076 55 58.84424(W)   ADJUSTED
 HV7659* NAVD 88 ORTHO HEIGHT -    13.    (meters)       43.    (feet) SCALED
 HV7659  ______________________________________________________________________
 HV7659  GEOID HEIGHT    -        -32.250 (meters)                     GEOID18
 HV7659  LAPLACE CORR    -         -4.51  (seconds)                    DEFLEC18
 HV7659  HORZ ORDER      -  SECOND
 HV7659
 HV7659.The horizontal coordinates were established by classical geodetic methods
 HV7659.and adjusted by the National Geodetic Survey in November 1994.
 HV7659
 HV7659.The orthometric height was scaled from a topographic map.
 HV7659
 HV7659.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7659.GEOID18 height accuracy estimate available here.
 HV7659
 HV7659.Click photographs - Photos may exist for this station.
 HV7659
 HV7659.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7659
 HV7659. The following values were computed from the NAD 83(1993) position.
 HV7659
 HV7659;                    North         East     Units Scale Factor Converg.
 HV7659;SPC MD       -   137,972.535   405,809.991   MT  0.99995002   +0 02 31.4
 HV7659;SPC MD       -   452,664.89  1,331,394.95   sFT  0.99995002   +0 02 31.4
 HV7659;SPC VA N     - 2,139,125.168 3,635,903.227   MT  0.99996135   +0 58 40.7
 HV7659;SPC VA N     - 7,018,113.16 11,928,792.50   sFT  0.99996135   +0 58 40.7
 HV7659;UTM  18      - 4,308,520.445   332,397.500   MT  0.99994591   -1 12 51.8
 HV7659
 HV7659!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7659!SPC MD       -   1.00000306  x   0.99995002  =   0.99995308
 HV7659!SPC VA N     -   1.00000306  x   0.99996135  =   0.99996441
 HV7659!UTM  18      -   1.00000306  x   0.99994591  =   0.99994897
 HV7659
 HV7659_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3239708520(NAD 83)
 HV7659
 HV7659                          SUPERSEDED SURVEY CONTROL
 HV7659
 HV7659  NAD 83(1991)-  38 54 34.54001(N)    076 55 58.84526(W) AD(       ) 2
 HV7659  NAD 83(1986)-  38 54 34.53893(N)    076 55 58.85578(W) AD(       ) 2
 HV7659  NAD 27      -  38 54 34.13790(N)    076 55 59.94920(W) AD(       ) 2
 HV7659
 HV7659.Superseded values are not recommended for survey control.
 HV7659
 HV7659.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7659.See file dsdata.pdf to determine how the superseded data were derived.
 HV7659
 HV7659_MARKER: Z = SEE DESCRIPTION
 HV7659_SETTING: 0 = UNSPECIFIED SETTING
 HV7659_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7659
 HV7659  HISTORY     - Date     Condition        Report By
 HV7659  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7659  HISTORY     - 1971     GOOD             NGS
 HV7659
 HV7659                          STATION DESCRIPTION
 HV7659
 HV7659'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7659'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7659
 HV7659                          STATION RECOVERY (1971)
 HV7659
 HV7659'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7659'THE STATION WAS NOT RECOVERED AND IT APPEARS NEW ROAD WORK AND
 HV7659'GUARD RAILS WERE PUT UP IN AREA NEAR STATION SITE.  ALL THREE
 HV7659'REFERENCE POINTS, NAILS AND WASHERS, WERE RECOVERED.  HOWEVER, THE
 HV7659'MEASUREMENTS GIVEN WILL NOT INTERSECT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7660 ***********************************************************************
 HV7660  DESIGNATION -  N E 147 B 1960
 HV7660  PID         -  HV7660
 HV7660  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7660  COUNTRY     -  US
 HV7660  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7660
 HV7660                         *CURRENT SURVEY CONTROL
 HV7660  ______________________________________________________________________
 HV7660* NAD 83(1993) POSITION- 38 54 31.06121(N) 076 55 53.99085(W)   ADJUSTED
 HV7660* NAVD 88 ORTHO HEIGHT -    11.    (meters)       36.    (feet) SCALED
 HV7660  ______________________________________________________________________
 HV7660  GEOID HEIGHT    -        -32.255 (meters)                     GEOID18
 HV7660  LAPLACE CORR    -         -4.51  (seconds)                    DEFLEC18
 HV7660  HORZ ORDER      -  SECOND
 HV7660
 HV7660.The horizontal coordinates were established by classical geodetic methods
 HV7660.and adjusted by the National Geodetic Survey in November 1994.
 HV7660
 HV7660.The orthometric height was scaled from a topographic map.
 HV7660
 HV7660.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7660.GEOID18 height accuracy estimate available here.
 HV7660
 HV7660.Click photographs - Photos may exist for this station.
 HV7660
 HV7660.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7660
 HV7660. The following values were computed from the NAD 83(1993) position.
 HV7660
 HV7660;                    North         East     Units Scale Factor Converg.
 HV7660;SPC MD       -   137,865.310   405,927.000   MT  0.99995001   +0 02 34.4
 HV7660;SPC MD       -   452,313.10  1,331,778.83   sFT  0.99995001   +0 02 34.4
 HV7660;SPC VA N     - 2,139,019.868 3,636,021.974   MT  0.99996126   +0 58 43.8
 HV7660;SPC VA N     - 7,017,767.68 11,929,182.09   sFT  0.99996126   +0 58 43.8
 HV7660;UTM  18      - 4,308,410.681   332,512.129   MT  0.99994544   -1 12 48.7
 HV7660
 HV7660!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7660!SPC MD       -   1.00000337  x   0.99995001  =   0.99995338
 HV7660!SPC VA N     -   1.00000337  x   0.99996126  =   0.99996463
 HV7660!UTM  18      -   1.00000337  x   0.99994544  =   0.99994881
 HV7660
 HV7660:                Primary Azimuth Mark                     Grid Az
 HV7660:SPC MD       -  N E 147 C 1960                           179 44 57.6
 HV7660:SPC VA N     -  N E 147 C 1960                           178 48 48.2
 HV7660:UTM  18      -  N E 147 C 1960                           181 00 20.7
 HV7660
 HV7660_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3251208410(NAD 83)
 HV7660
 HV7660|---------------------------------------------------------------------|
 HV7660| PID    Reference Object                     Distance      Geod. Az  |
 HV7660|                                                           dddmmss.s |
 HV7660| HV7661 N E 147 C 1960                      APPROX. 0.8 KM 1794732.0 |
 HV7660| HV7659 N E 147 A 1960                      158.716 METERS 31233     |
 HV7660|---------------------------------------------------------------------|
 HV7660
 HV7660                          SUPERSEDED SURVEY CONTROL
 HV7660
 HV7660  NAD 83(1991)-  38 54 31.05991(N)    076 55 53.99188(W) AD(       ) 2
 HV7660  NAD 83(1986)-  38 54 31.05882(N)    076 55 54.00241(W) AD(       ) 2
 HV7660  NAD 27      -  38 54 30.65750(N)    076 55 55.09570(W) AD(       ) 2
 HV7660
 HV7660.Superseded values are not recommended for survey control.
 HV7660
 HV7660.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7660.See file dsdata.pdf to determine how the superseded data were derived.
 HV7660
 HV7660_MARKER: Z = SEE DESCRIPTION
 HV7660_SETTING: 0 = UNSPECIFIED SETTING
 HV7660_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7660
 HV7660  HISTORY     - Date     Condition        Report By
 HV7660  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7660  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7660
 HV7660                          STATION DESCRIPTION
 HV7660
 HV7660'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7660'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7660
 HV7660                          STATION RECOVERY (1971)
 HV7660
 HV7660'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7660'STATION WAS NOT RECOVERED AND IS BELIEVED LOST.  ALL REFERENCE
 HV7660'POINTS WERE RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7661 ***********************************************************************
 HV7661  DESIGNATION -  N E 147 C 1960
 HV7661  PID         -  HV7661
 HV7661  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7661  COUNTRY     -  US
 HV7661  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7661
 HV7661                         *CURRENT SURVEY CONTROL
 HV7661  ______________________________________________________________________
 HV7661* NAD 83(1993) POSITION- 38 54 05.98741(N) 076 55 53.87449(W)   ADJUSTED
 HV7661* NAVD 88 ORTHO HEIGHT -    44.    (meters)      144.    (feet) SCALED
 HV7661  ______________________________________________________________________
 HV7661  GEOID HEIGHT    -        -32.264 (meters)                     GEOID18
 HV7661  LAPLACE CORR    -         -4.42  (seconds)                    DEFLEC18
 HV7661  HORZ ORDER      -  SECOND
 HV7661
 HV7661.The horizontal coordinates were established by classical geodetic methods
 HV7661.and adjusted by the National Geodetic Survey in November 1994.
 HV7661
 HV7661.The orthometric height was scaled from a topographic map.
 HV7661
 HV7661.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7661.GEOID18 height accuracy estimate available here.
 HV7661
 HV7661.Click photographs - Photos may exist for this station.
 HV7661
 HV7661.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7661
 HV7661. The following values were computed from the NAD 83(1993) position.
 HV7661
 HV7661;                    North         East     Units Scale Factor Converg.
 HV7661;SPC MD       -   137,092.147   405,930.383   MT  0.99994995   +0 02 34.5
 HV7661;SPC MD       -   449,776.49  1,331,789.93   sFT  0.99994995   +0 02 34.5
 HV7661;SPC VA N     - 2,138,246.855 3,636,037.985   MT  0.99996065   +0 58 43.8
 HV7661;SPC VA N     - 7,015,231.56 11,929,234.62   sFT  0.99996065   +0 58 43.8
 HV7661;UTM  18      - 4,307,637.633   332,498.559   MT  0.99994549   -1 12 47.9
 HV7661
 HV7661!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7661!SPC MD       -   0.99999820  x   0.99994995  =   0.99994815
 HV7661!SPC VA N     -   0.99999820  x   0.99996065  =   0.99995885
 HV7661!UTM  18      -   0.99999820  x   0.99994549  =   0.99994369
 HV7661
 HV7661:                Primary Azimuth Mark                     Grid Az
 HV7661:SPC MD       -  N E 147 B 1960                           359 44 57.6
 HV7661:SPC VA N     -  N E 147 B 1960                           358 48 48.3
 HV7661:UTM  18      -  N E 147 B 1960                           001 00 20.0
 HV7661
 HV7661_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3249807637(NAD 83)
 HV7661
 HV7661|---------------------------------------------------------------------|
 HV7661| PID    Reference Object                     Distance      Geod. Az  |
 HV7661|                                                           dddmmss.s |
 HV7661| HV1476 NE 148                              362.922 METERS 18140     |
 HV7661| HV7660 N E 147 B 1960                      APPROX. 0.8 KM 3594732.1 |
 HV7661|---------------------------------------------------------------------|
 HV7661
 HV7661                          SUPERSEDED SURVEY CONTROL
 HV7661
 HV7661  NAD 83(1991)-  38 54 05.98611(N)    076 55 53.87554(W) AD(       ) 2
 HV7661  NAD 83(1986)-  38 54 05.98503(N)    076 55 53.88612(W) AD(       ) 2
 HV7661  NAD 27      -  38 54 05.58380(N)    076 55 54.97940(W) AD(       ) 2
 HV7661
 HV7661.Superseded values are not recommended for survey control.
 HV7661
 HV7661.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7661.See file dsdata.pdf to determine how the superseded data were derived.
 HV7661
 HV7661_MARKER: Z = SEE DESCRIPTION
 HV7661_SETTING: 0 = UNSPECIFIED SETTING
 HV7661_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7661
 HV7661  HISTORY     - Date     Condition        Report By
 HV7661  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7661  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7661
 HV7661                          STATION DESCRIPTION
 HV7661
 HV7661'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7661'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7661
 HV7661                          STATION RECOVERY (1971)
 HV7661
 HV7661'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7661'STATION POINT IS UNDER NEW MACADAM SURFACE OF STREET AND WAS NOT
 HV7661'DUG UP.  ALL REFERENCE POINTS GIVEN WERE RECOVERED IN GOOD
 HV7661'CONDITION.  THE HOUSE NO. 4830 AS GIVEN IN REFERENCE NOTES SHOULD
 HV7661'BE NO. 4850.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7651 ***********************************************************************
 HV7651  DESIGNATION -  N E 148 A 1960
 HV7651  PID         -  HV7651
 HV7651  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7651  COUNTRY     -  US
 HV7651  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7651
 HV7651                         *CURRENT SURVEY CONTROL
 HV7651  ______________________________________________________________________
 HV7651* NAD 83(1993) POSITION- 38 53 53.86277(N) 076 55 18.49498(W)   ADJUSTED
 HV7651* NAVD 88 ORTHO HEIGHT -    22.    (meters)       72.    (feet) SCALED
 HV7651  ______________________________________________________________________
 HV7651  GEOID HEIGHT    -        -32.292 (meters)                     GEOID18
 HV7651  LAPLACE CORR    -         -4.68  (seconds)                    DEFLEC18
 HV7651  HORZ ORDER      -  SECOND
 HV7651
 HV7651.The horizontal coordinates were established by classical geodetic methods
 HV7651.and adjusted by the National Geodetic Survey in November 1994.
 HV7651
 HV7651.The orthometric height was scaled from a topographic map.
 HV7651
 HV7651.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7651.GEOID18 height accuracy estimate available here.
 HV7651
 HV7651.Click photographs - Photos may exist for this station.
 HV7651
 HV7651.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7651
 HV7651. The following values were computed from the NAD 83(1993) position.
 HV7651
 HV7651;                    North         East     Units Scale Factor Converg.
 HV7651;SPC MD       -   136,718.962   406,783.171   MT  0.99994992   +0 02 56.7
 HV7651;SPC MD       -   448,552.13  1,334,587.79   sFT  0.99994992   +0 02 56.7
 HV7651;SPC VA N     - 2,137,887.645 3,636,896.764   MT  0.99996036   +0 59 05.9
 HV7651;SPC VA N     - 7,014,053.05 11,932,052.13   sFT  0.99996036   +0 59 05.9
 HV7651;UTM  18      - 4,307,245.845   333,342.956   MT  0.99994202   -1 12 25.4
 HV7651
 HV7651!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7651!SPC MD       -   1.00000165  x   0.99994992  =   0.99995157
 HV7651!SPC VA N     -   1.00000165  x   0.99996036  =   0.99996201
 HV7651!UTM  18      -   1.00000165  x   0.99994202  =   0.99994367
 HV7651
 HV7651:                Primary Azimuth Mark                     Grid Az
 HV7651:SPC MD       -  NE 148                                   270 41 31.9
 HV7651:SPC VA N     -  NE 148                                   269 45 22.7
 HV7651:UTM  18      -  NE 148                                   271 56 54.0
 HV7651
 HV7651_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3334207245(NAD 83)
 HV7651
 HV7651|---------------------------------------------------------------------|
 HV7651| PID    Reference Object                     Distance      Geod. Az  |
 HV7651|                                                           dddmmss.s |
 HV7651| HV7650 N E 148 B 1960                      APPROX. 0.5 KM 1815438.1 |
 HV7651| HV1476 NE 148                              APPROX. 0.9 KM 2704428.6 |
 HV7651|---------------------------------------------------------------------|
 HV7651
 HV7651                          SUPERSEDED SURVEY CONTROL
 HV7651
 HV7651  NAD 83(1991)-  38 53 53.86145(N)    076 55 18.49604(W) AD(       ) 2
 HV7651  NAD 83(1986)-  38 53 53.86031(N)    076 55 18.50665(W) AD(       ) 2
 HV7651  NAD 27      -  38 53 53.45920(N)    076 55 19.60040(W) AD(       ) 2
 HV7651
 HV7651.Superseded values are not recommended for survey control.
 HV7651
 HV7651.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7651.See file dsdata.pdf to determine how the superseded data were derived.
 HV7651
 HV7651_MARKER: DS = TRIANGULATION STATION DISK
 HV7651_SETTING: 0 = UNSPECIFIED SETTING
 HV7651_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7651
 HV7651  HISTORY     - Date     Condition        Report By
 HV7651  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7651  HISTORY     - 1971     GOOD             NGS
 HV7651
 HV7651                          STATION DESCRIPTION
 HV7651
 HV7651'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7651'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV7651'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.E. 148-A
 HV7651'GROUTED IN CURB.
 HV7651
 HV7651                          STATION RECOVERY (1971)
 HV7651
 HV7651'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7651'STATION RECOVERED AS DESCRIBED IN GOOD CONDITION.  REFERENCE POINTS
 HV7651'RECOVERED, WITH THE EXCEPTION THE CROSS CHISELED ON MANHOLE RIM
 HV7651'IN STREET INTERSECTION IS WORN OFF.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7650 ***********************************************************************
 HV7650  DESIGNATION -  N E 148 B 1960
 HV7650  PID         -  HV7650
 HV7650  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7650  COUNTRY     -  US
 HV7650  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7650
 HV7650                         *CURRENT SURVEY CONTROL
 HV7650  ______________________________________________________________________
 HV7650* NAD 83(1993) POSITION- 38 53 37.16464(N) 076 55 19.20775(W)   ADJUSTED
 HV7650* NAVD 88 ORTHO HEIGHT -    30.    (meters)       98.    (feet) SCALED
 HV7650  ______________________________________________________________________
 HV7650  GEOID HEIGHT    -        -32.298 (meters)                     GEOID18
 HV7650  LAPLACE CORR    -         -4.68  (seconds)                    DEFLEC18
 HV7650  HORZ ORDER      -  SECOND
 HV7650
 HV7650.The horizontal coordinates were established by classical geodetic methods
 HV7650.and adjusted by the National Geodetic Survey in November 1994.
 HV7650
 HV7650.The orthometric height was scaled from a topographic map.
 HV7650
 HV7650.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7650.GEOID18 height accuracy estimate available here.
 HV7650
 HV7650.Click photographs - Photos may exist for this station.
 HV7650
 HV7650.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7650
 HV7650. The following values were computed from the NAD 83(1993) position.
 HV7650
 HV7650;                    North         East     Units Scale Factor Converg.
 HV7650;SPC MD       -   136,204.051   406,766.436   MT  0.99994990   +0 02 56.2
 HV7650;SPC MD       -   446,862.79  1,334,532.88   sFT  0.99994990   +0 02 56.2
 HV7650;SPC VA N     - 2,137,372.525 3,636,888.441   MT  0.99995997   +0 59 05.5
 HV7650;SPC VA N     - 7,012,363.03 11,932,024.83   sFT  0.99995997   +0 59 05.5
 HV7650;UTM  18      - 4,306,731.429   333,314.938   MT  0.99994213   -1 12 25.4
 HV7650
 HV7650!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7650!SPC MD       -   1.00000040  x   0.99994990  =   0.99995030
 HV7650!SPC VA N     -   1.00000040  x   0.99995997  =   0.99996037
 HV7650!UTM  18      -   1.00000040  x   0.99994213  =   0.99994253
 HV7650
 HV7650:                Primary Azimuth Mark                     Grid Az
 HV7650:SPC MD       -  N E 148 A 1960                           001 51 41.5
 HV7650:SPC VA N     -  N E 148 A 1960                           000 55 32.2
 HV7650:UTM  18      -  N E 148 A 1960                           003 07 03.1
 HV7650
 HV7650_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3331406731(NAD 83)
 HV7650
 HV7650|---------------------------------------------------------------------|
 HV7650| PID    Reference Object                     Distance      Geod. Az  |
 HV7650|                                                           dddmmss.s |
 HV7650| HV7651 N E 148 A 1960                      APPROX. 0.5 KM 0015437.7 |
 HV7650| HV7649 N E 148 C 1960                      169.845 METERS 19601     |
 HV7650|---------------------------------------------------------------------|
 HV7650
 HV7650                          SUPERSEDED SURVEY CONTROL
 HV7650
 HV7650  NAD 83(1991)-  38 53 37.16332(N)    076 55 19.20883(W) AD(       ) 2
 HV7650  NAD 83(1986)-  38 53 37.16218(N)    076 55 19.21948(W) AD(       ) 2
 HV7650  NAD 27      -  38 53 36.76100(N)    076 55 20.31310(W) AD(       ) 2
 HV7650
 HV7650.Superseded values are not recommended for survey control.
 HV7650
 HV7650.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7650.See file dsdata.pdf to determine how the superseded data were derived.
 HV7650
 HV7650_MARKER: Z = SEE DESCRIPTION
 HV7650_SETTING: 0 = UNSPECIFIED SETTING
 HV7650_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7650
 HV7650  HISTORY     - Date     Condition        Report By
 HV7650  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7650  HISTORY     - 1971     GOOD             NGS
 HV7650
 HV7650                          STATION DESCRIPTION
 HV7650
 HV7650'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7650'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7650
 HV7650                          STATION RECOVERY (1971)
 HV7650
 HV7650'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7650'STATION RECOVERED IN GOOD CONDITION AS DESCRIBED AND SHOWN ON
 HV7650'SKETCH.  THE HOUSE REFERENCE TO IS NO. 344 INSTEAD OF 346 AS
 HV7650'SHOWN ON SKETCH.  IT IS ALSO APPROXIMATELY 300 FEET SOUTH OF THE
 HV7650'INTERSECTION OF 55TH STREET AND CLAY PL. GO EAST FROM 55TH ST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7649 ***********************************************************************
 HV7649  DESIGNATION -  N E 148 C 1960
 HV7649  PID         -  HV7649
 HV7649  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7649  COUNTRY     -  US
 HV7649  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7649
 HV7649                         *CURRENT SURVEY CONTROL
 HV7649  ______________________________________________________________________
 HV7649* NAD 83(1993) POSITION- 38 53 31.87077(N) 076 55 21.15297(W)   ADJUSTED
 HV7649* NAVD 88 ORTHO HEIGHT -    27.    (meters)       89.    (feet) SCALED
 HV7649  ______________________________________________________________________
 HV7649  GEOID HEIGHT    -        -32.299 (meters)                     GEOID18
 HV7649  LAPLACE CORR    -         -4.67  (seconds)                    DEFLEC18
 HV7649  HORZ ORDER      -  SECOND
 HV7649
 HV7649.The horizontal coordinates were established by classical geodetic methods
 HV7649.and adjusted by the National Geodetic Survey in November 1994.
 HV7649
 HV7649.The orthometric height was scaled from a topographic map.
 HV7649
 HV7649.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7649.GEOID18 height accuracy estimate available here.
 HV7649
 HV7649.Click photographs - Photos may exist for this station.
 HV7649
 HV7649.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7649
 HV7649. The following values were computed from the NAD 83(1993) position.
 HV7649
 HV7649;                    North         East     Units Scale Factor Converg.
 HV7649;SPC MD       -   136,040.772   406,719.699   MT  0.99994989   +0 02 55.0
 HV7649;SPC MD       -   446,327.10  1,334,379.55   sFT  0.99994989   +0 02 55.0
 HV7649;SPC VA N     - 2,137,208.502 3,636,844.378   MT  0.99995985   +0 59 04.3
 HV7649;SPC VA N     - 7,011,824.89 11,931,880.26   sFT  0.99995985   +0 59 04.3
 HV7649;UTM  18      - 4,306,569.215   333,264.634   MT  0.99994234   -1 12 26.5
 HV7649
 HV7649!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7649!SPC MD       -   1.00000087  x   0.99994989  =   0.99995076
 HV7649!SPC VA N     -   1.00000087  x   0.99995985  =   0.99996072
 HV7649!UTM  18      -   1.00000087  x   0.99994234  =   0.99994321
 HV7649
 HV7649_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3326406569(NAD 83)
 HV7649
 HV7649                          SUPERSEDED SURVEY CONTROL
 HV7649
 HV7649  NAD 83(1991)-  38 53 31.86944(N)    076 55 21.15405(W) AD(       ) 2
 HV7649  NAD 83(1986)-  38 53 31.86830(N)    076 55 21.16471(W) AD(       ) 2
 HV7649  NAD 27      -  38 53 31.46720(N)    076 55 22.25820(W) AD(       ) 2
 HV7649
 HV7649.Superseded values are not recommended for survey control.
 HV7649
 HV7649.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7649.See file dsdata.pdf to determine how the superseded data were derived.
 HV7649
 HV7649_MARKER: Z = SEE DESCRIPTION
 HV7649_SETTING: 0 = UNSPECIFIED SETTING
 HV7649_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7649
 HV7649  HISTORY     - Date     Condition        Report By
 HV7649  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7649  HISTORY     - 1971     GOOD             NGS
 HV7649
 HV7649                          STATION DESCRIPTION
 HV7649
 HV7649'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7649'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7649
 HV7649                          STATION RECOVERY (1971)
 HV7649
 HV7649'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7649'STATION RECOVERED IN GOOD CONDITION.  REFERENCE POINTS GIVEN ARE
 HV7649'GOOD WITH THE EXCEPTIONS.  HOUSE NO. 240 IS NOW NO. 238 AND HOUSE
 HV7649'NO. 250 IS NOW NO. 248.  IT IS ALSO 7.5 FEET NORTH OF THE CENTER
 HV7649'OF POLE NO. PEP 527 538.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4280 ***********************************************************************
 HV4280  DESIGNATION -  N W 101 A 1960
 HV4280  PID         -  HV4280
 HV4280  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4280  COUNTRY     -  US
 HV4280  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4280
 HV4280                         *CURRENT SURVEY CONTROL
 HV4280  ______________________________________________________________________
 HV4280* NAD 83(1993) POSITION- 38 58 35.28597(N) 077 03 09.63019(W)   ADJUSTED
 HV4280* NAVD 88 ORTHO HEIGHT -    63.    (meters)      207.    (feet) SCALED
 HV4280  ______________________________________________________________________
 HV4280  GEOID HEIGHT    -        -31.950 (meters)                     GEOID18
 HV4280  LAPLACE CORR    -         -2.78  (seconds)                    DEFLEC18
 HV4280  HORZ ORDER      -  SECOND
 HV4280
 HV4280.The horizontal coordinates were established by classical geodetic methods
 HV4280.and adjusted by the National Geodetic Survey in November 1994.
 HV4280
 HV4280.The orthometric height was scaled from a topographic map.
 HV4280
 HV4280.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4280.GEOID18 height accuracy estimate available here.
 HV4280
 HV4280.Click photographs - Photos may exist for this station.
 HV4280
 HV4280.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4280
 HV4280. The following values were computed from the NAD 83(1993) position.
 HV4280
 HV4280;                    North         East     Units Scale Factor Converg.
 HV4280;SPC MD       -   145,395.276   395,435.661   MT  0.99995139   -0 01 59.0
 HV4280;SPC MD       -   477,017.67  1,297,358.50   sFT  0.99995139   -0 01 59.0
 HV4280;SPC VA N     - 2,146,377.522 3,625,408.861   MT  0.99996797   +0 54 11.9
 HV4280;SPC VA N     - 7,041,906.92 11,894,362.24   sFT  0.99996797   +0 54 11.9
 HV4280;UTM  18      - 4,316,169.183   322,188.382   MT  0.99998933   -1 17 29.3
 HV4280
 HV4280!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4280!SPC MD       -   0.99999516  x   0.99995139  =   0.99994655
 HV4280!SPC VA N     -   0.99999516  x   0.99996797  =   0.99996313
 HV4280!UTM  18      -   0.99999516  x   0.99998933  =   0.99998449
 HV4280
 HV4280:                Primary Azimuth Mark                     Grid Az
 HV4280:SPC MD       -  N W 101 B 1960                           186 09 46.7
 HV4280:SPC VA N     -  N W 101 B 1960                           185 13 35.8
 HV4280:UTM  18      -  N W 101 B 1960                           187 25 17.0
 HV4280
 HV4280_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2218816169(NAD 83)
 HV4280
 HV4280|---------------------------------------------------------------------|
 HV4280| PID    Reference Object                     Distance      Geod. Az  |
 HV4280|                                                           dddmmss.s |
 HV4280| HV2133 NW 101                              366.215 METERS 00804     |
 HV4280| HV4310 N W 101 B 1960                      416.001 METERS 1860747.7 |
 HV4280|---------------------------------------------------------------------|
 HV4280
 HV4280                          SUPERSEDED SURVEY CONTROL
 HV4280
 HV4280  NAD 83(1991)-  38 58 35.28525(N)    077 03 09.63114(W) AD(       ) 2
 HV4280  NAD 83(1986)-  38 58 35.28491(N)    077 03 09.64110(W) AD(       ) 2
 HV4280  NAD 27      -  38 58 34.88910(N)    077 03 10.71780(W) AD(       ) 2
 HV4280
 HV4280.Superseded values are not recommended for survey control.
 HV4280
 HV4280.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4280.See file dsdata.pdf to determine how the superseded data were derived.
 HV4280
 HV4280_MARKER: Z = SEE DESCRIPTION
 HV4280_SETTING: 0 = UNSPECIFIED SETTING
 HV4280_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4280
 HV4280  HISTORY     - Date     Condition        Report By
 HV4280  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4280  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4280
 HV4280                          STATION DESCRIPTION
 HV4280
 HV4280'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4280'THE STATION IS UNDER A NEW SURFACE OF MACADAM ROAD AND WAS NOT DUG
 HV4280'UP.  NW 101-AZ U.S.D. 1 N.P.S., BM R.C. 24 IS IN POSITION AND
 HV4280'PROTRUDES ABOUT 1-INCH FROM PARAPET WALL.  THE TWO REFERENCE POINTS
 HV4280'OF RAMSET NAILS HAVE RUSTED AWAY, AND P.E.P.C.O. POLE NO. 13957
 HV4280'NO LONGER EXISTS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4310 ***********************************************************************
 HV4310  DESIGNATION -  N W 101 B 1960
 HV4310  PID         -  HV4310
 HV4310  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4310  COUNTRY     -  US
 HV4310  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4310
 HV4310                         *CURRENT SURVEY CONTROL
 HV4310  ______________________________________________________________________
 HV4310* NAD 83(1993) POSITION- 38 58 21.87301(N) 077 03 11.47556(W)   ADJUSTED
 HV4310* NAVD 88 ORTHO HEIGHT -    84.    (meters)      276.    (feet) SCALED
 HV4310  ______________________________________________________________________
 HV4310  GEOID HEIGHT    -        -31.951 (meters)                     GEOID18
 HV4310  LAPLACE CORR    -         -2.82  (seconds)                    DEFLEC18
 HV4310  HORZ ORDER      -  SECOND
 HV4310
 HV4310.The horizontal coordinates were established by classical geodetic methods
 HV4310.and adjusted by the National Geodetic Survey in November 1994.
 HV4310
 HV4310.The orthometric height was scaled from a topographic map.
 HV4310
 HV4310.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4310.GEOID18 height accuracy estimate available here.
 HV4310
 HV4310.Click photographs - Photos may exist for this station.
 HV4310
 HV4310.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4310
 HV4310. The following values were computed from the NAD 83(1993) position.
 HV4310
 HV4310;                    North         East     Units Scale Factor Converg.
 HV4310;SPC MD       -   144,981.700   395,391.002   MT  0.99995127   -0 02 00.2
 HV4310;SPC MD       -   475,660.79  1,297,211.98   sFT  0.99995127   -0 02 00.2
 HV4310;SPC VA N     - 2,145,963.264 3,625,370.967   MT  0.99996756   +0 54 10.7
 HV4310;SPC VA N     - 7,040,547.81 11,894,237.91   sFT  0.99996756   +0 54 10.7
 HV4310;UTM  18      - 4,315,756.672   322,134.649   MT  0.99998956   -1 17 30.1
 HV4310
 HV4310!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4310!SPC MD       -   0.99999187  x   0.99995127  =   0.99994314
 HV4310!SPC VA N     -   0.99999187  x   0.99996756  =   0.99995943
 HV4310!UTM  18      -   0.99999187  x   0.99998956  =   0.99998143
 HV4310
 HV4310:                Primary Azimuth Mark                     Grid Az
 HV4310:SPC MD       -  N W 101 A 1960                           006 09 46.8
 HV4310:SPC VA N     -  N W 101 A 1960                           005 13 35.9
 HV4310:UTM  18      -  N W 101 A 1960                           007 25 16.7
 HV4310
 HV4310_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2213415756(NAD 83)
 HV4310
 HV4310|---------------------------------------------------------------------|
 HV4310| PID    Reference Object                     Distance      Geod. Az  |
 HV4310|                                                           dddmmss.s |
 HV4310| HV4280 N W 101 A 1960                      416.001 METERS 0060746.6 |
 HV4310| HV4304 N W 101 C 1960                      208.359 METERS 18845     |
 HV4310|---------------------------------------------------------------------|
 HV4310
 HV4310                          SUPERSEDED SURVEY CONTROL
 HV4310
 HV4310  NAD 83(1991)-  38 58 21.87227(N)    077 03 11.47652(W) AD(       ) 2
 HV4310  NAD 83(1986)-  38 58 21.87193(N)    077 03 11.48650(W) AD(       ) 2
 HV4310  NAD 27      -  38 58 21.47550(N)    077 03 12.56300(W) AD(       ) 2
 HV4310
 HV4310.Superseded values are not recommended for survey control.
 HV4310
 HV4310.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4310.See file dsdata.pdf to determine how the superseded data were derived.
 HV4310
 HV4310_MARKER: Z = SEE DESCRIPTION
 HV4310_SETTING: 0 = UNSPECIFIED SETTING
 HV4310_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4310
 HV4310  HISTORY     - Date     Condition        Report By
 HV4310  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4310  HISTORY     - 1971     GOOD             NGS
 HV4310
 HV4310                          STATION DESCRIPTION
 HV4310
 HV4310'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4310'THE STATION WAS RECOVERED ABOUT 2-INCHES BELOW SURFACE OF
 HV4310'PAVEMENT.  REFERENCE POINT, NAIL AND WASHER IN 12-INCH BEECH TREE
 HV4310'NO LONGER EXISTS.  THE OTHER TWO REFERENCE POINTS REMAIN AS
 HV4310'DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4304 ***********************************************************************
 HV4304  DESIGNATION -  N W 101 C 1960
 HV4304  PID         -  HV4304
 HV4304  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4304  COUNTRY     -  US
 HV4304  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4304
 HV4304                         *CURRENT SURVEY CONTROL
 HV4304  ______________________________________________________________________
 HV4304* NAD 83(1993) POSITION- 38 58 15.19485(N) 077 03 12.79132(W)   ADJUSTED
 HV4304* NAVD 88 ORTHO HEIGHT -    69.40  (+/-2cm)      227.7   (feet) VERTCON3
 HV4304  ______________________________________________________________________
 HV4304  GEOID HEIGHT    -        -31.952 (meters)                     GEOID18
 HV4304  LAPLACE CORR    -         -2.83  (seconds)                    DEFLEC18
 HV4304  HORZ ORDER      -  SECOND
 HV4304  VERT ORDER      -  THIRD ? (See Below)
 HV4304
 HV4304.The horizontal coordinates were established by classical geodetic methods
 HV4304.and adjusted by the National Geodetic Survey in November 1994.
 HV4304
 HV4304.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4304.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4304
 HV4304.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4304.GEOID18 height accuracy estimate available here.
 HV4304
 HV4304.The vertical order pertains to the NGVD 29 superseded value.
 HV4304
 HV4304.Click photographs - Photos may exist for this station.
 HV4304
 HV4304.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4304
 HV4304. The following values were computed from the NAD 83(1993) position.
 HV4304
 HV4304;                    North         East     Units Scale Factor Converg.
 HV4304;SPC MD       -   144,775.791   395,359.210   MT  0.99995122   -0 02 01.0
 HV4304;SPC MD       -   474,985.24  1,297,107.67   sFT  0.99995122   -0 02 01.0
 HV4304;SPC VA N     - 2,145,756.860 3,625,342.543   MT  0.99996736   +0 54 09.9
 HV4304;SPC VA N     - 7,039,870.63 11,894,144.66   sFT  0.99996736   +0 54 09.9
 HV4304;UTM  18      - 4,315,551.503   322,098.342   MT  0.99998972   -1 17 30.7
 HV4304
 HV4304!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4304!SPC MD       -   0.99999412  x   0.99995122  =   0.99994535
 HV4304!SPC VA N     -   0.99999412  x   0.99996736  =   0.99996148
 HV4304!UTM  18      -   0.99999412  x   0.99998972  =   0.99998384
 HV4304
 HV4304:                Primary Azimuth Mark                     Grid Az
 HV4304:SPC MD       -  NW 102 DCDHT                             237 26 59.6
 HV4304:SPC VA N     -  NW 102 DCDHT                             236 30 48.7
 HV4304:UTM  18      -  NW 102 DCDHT                             238 42 29.3
 HV4304
 HV4304_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2209815551(NAD 83)
 HV4304
 HV4304|---------------------------------------------------------------------|
 HV4304| PID    Reference Object                     Distance      Geod. Az  |
 HV4304|                                                           dddmmss.s |
 HV4304| HV4310 N W 101 B 1960                      208.359 METERS 00845     |
 HV4304| HV2130 NW 102 DCDHT                        APPROX. 0.7 KM 2372458.6 |
 HV4304|---------------------------------------------------------------------|
 HV4304
 HV4304                          SUPERSEDED SURVEY CONTROL
 HV4304
 HV4304  NAD 83(1991)-  38 58 15.19409(N)    077 03 12.79230(W) AD(       ) 2
 HV4304  NAD 83(1986)-  38 58 15.19374(N)    077 03 12.80229(W) AD(       ) 2
 HV4304  NAD 27      -  38 58 14.79680(N)    077 03 13.87870(W) AD(       ) 2
 HV4304  NGVD 29              69.62   (m)          228.4    (f) LEVELING    3  
 HV4304
 HV4304.Superseded values are not recommended for survey control.
 HV4304
 HV4304.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4304.See file dsdata.pdf to determine how the superseded data were derived.
 HV4304
 HV4304_MARKER: Z = SEE DESCRIPTION
 HV4304_SETTING: 0 = UNSPECIFIED SETTING
 HV4304_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4304
 HV4304  HISTORY     - Date     Condition        Report By
 HV4304  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4304  HISTORY     - 1971     GOOD             NGS
 HV4304
 HV4304                          STATION DESCRIPTION
 HV4304
 HV4304'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4304'THE STATION WAS RECOVERED AFTER 2-INCHES OF PAVEMENT WAS DUG
 HV4304'OUT.  THE REFERENCE POINT ON 15-INCH PIN OAK TREE IS LOST AS
 HV4304'TREE HAS BEEN CUT DOWN.  THE OTHER TWO REFERENCE POINTS REMAIN
 HV4304'AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4352 ***********************************************************************
 HV4352  DESIGNATION -  N W 101 D 1960
 HV4352  PID         -  HV4352
 HV4352  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4352  COUNTRY     -  US
 HV4352  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4352
 HV4352                         *CURRENT SURVEY CONTROL
 HV4352  ______________________________________________________________________
 HV4352* NAD 83(1993) POSITION- 38 58 47.55068(N) 077 03 13.83073(W)   ADJUSTED
 HV4352* NAVD 88 ORTHO HEIGHT -    93.    (meters)      305.    (feet) SCALED
 HV4352  ______________________________________________________________________
 HV4352  GEOID HEIGHT    -        -31.946 (meters)                     GEOID18
 HV4352  LAPLACE CORR    -         -2.80  (seconds)                    DEFLEC18
 HV4352  HORZ ORDER      -  SECOND
 HV4352
 HV4352.The horizontal coordinates were established by classical geodetic methods
 HV4352.and adjusted by the National Geodetic Survey in November 1994.
 HV4352
 HV4352.The orthometric height was scaled from a topographic map.
 HV4352
 HV4352.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4352.GEOID18 height accuracy estimate available here.
 HV4352
 HV4352.Click photographs - Photos may exist for this station.
 HV4352
 HV4352.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4352
 HV4352. The following values were computed from the NAD 83(1993) position.
 HV4352
 HV4352;                    North         East     Units Scale Factor Converg.
 HV4352;SPC MD       -   145,773.530   395,334.778   MT  0.99995149   -0 02 01.7
 HV4352;SPC MD       -   478,258.66  1,297,027.52   sFT  0.99995149   -0 02 01.7
 HV4352;SPC VA N     - 2,146,754.083 3,625,301.809   MT  0.99996834   +0 54 09.3
 HV4352;SPC VA N     - 7,043,142.35 11,894,011.02   sFT  0.99996834   +0 54 09.3
 HV4352;UTM  18      - 4,316,549.576   322,095.827   MT  0.99998973   -1 17 32.3
 HV4352
 HV4352!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4352!SPC MD       -   0.99999046  x   0.99995149  =   0.99994195
 HV4352!SPC VA N     -   0.99999046  x   0.99996834  =   0.99995880
 HV4352!UTM  18      -   0.99999046  x   0.99998973  =   0.99998019
 HV4352
 HV4352_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2209516549(NAD 83)
 HV4352
 HV4352                          SUPERSEDED SURVEY CONTROL
 HV4352
 HV4352  NAD 83(1991)-  38 58 47.54998(N)    077 03 13.83168(W) AD(       ) 2
 HV4352  NAD 83(1986)-  38 58 47.54966(N)    077 03 13.84164(W) AD(       ) 2
 HV4352  NAD 27      -  38 58 47.15450(N)    077 03 14.91920(W) AD(       ) 2
 HV4352
 HV4352.Superseded values are not recommended for survey control.
 HV4352
 HV4352.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4352.See file dsdata.pdf to determine how the superseded data were derived.
 HV4352
 HV4352_MARKER: Z = SEE DESCRIPTION
 HV4352_SETTING: 0 = UNSPECIFIED SETTING
 HV4352_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4352
 HV4352  HISTORY     - Date     Condition        Report By
 HV4352  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4352  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4352
 HV4352                          STATION DESCRIPTION
 HV4352
 HV4352'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4352'THE STATION IS UNDER SURFACE OF MACADAM PAVEMENT AND WAS NOT DUG
 HV4352'UP.  ALL REFERENCE POINTS WERE RECOVERED AS DESCRIBED.  HOUSE
 HV4352'NO. 3036 SHOWN ON SKETCH OF DESCRIPTION IS HOUSE NO. 3038.  HOUSE
 HV4352'NO. 3034 IS CORRECT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4321 ***********************************************************************
 HV4321  DESIGNATION -  N W 101 E 1960
 HV4321  PID         -  HV4321
 HV4321  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4321  COUNTRY     -  US
 HV4321  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4321
 HV4321                         *CURRENT SURVEY CONTROL
 HV4321  ______________________________________________________________________
 HV4321* NAD 83(1993) POSITION- 38 58 51.07612(N) 077 03 25.85859(W)   ADJUSTED
 HV4321* NAVD 88 ORTHO HEIGHT -    94.    (meters)      308.    (feet) SCALED
 HV4321  ______________________________________________________________________
 HV4321  GEOID HEIGHT    -        -31.940 (meters)                     GEOID18
 HV4321  LAPLACE CORR    -         -2.90  (seconds)                    DEFLEC18
 HV4321  HORZ ORDER      -  SECOND
 HV4321
 HV4321.The horizontal coordinates were established by classical geodetic methods
 HV4321.and adjusted by the National Geodetic Survey in November 1994.
 HV4321
 HV4321.The orthometric height was scaled from a topographic map.
 HV4321
 HV4321.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4321.GEOID18 height accuracy estimate available here.
 HV4321
 HV4321.Click photographs - Photos may exist for this station.
 HV4321
 HV4321.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4321
 HV4321. The following values were computed from the NAD 83(1993) position.
 HV4321
 HV4321;                    North         East     Units Scale Factor Converg.
 HV4321;SPC MD       -   145,882.416   395,045.353   MT  0.99995152   -0 02 09.2
 HV4321;SPC MD       -   478,615.89  1,296,077.96   sFT  0.99995152   -0 02 09.2
 HV4321;SPC VA N     - 2,146,858.227 3,625,010.638   MT  0.99996845   +0 54 01.8
 HV4321;SPC VA N     - 7,043,484.03 11,893,055.73   sFT  0.99996845   +0 54 01.8
 HV4321;UTM  18      - 4,316,664.798   321,808.853   MT  0.99999099   -1 17 40.0
 HV4321
 HV4321!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4321!SPC MD       -   0.99999030  x   0.99995152  =   0.99994182
 HV4321!SPC VA N     -   0.99999030  x   0.99996845  =   0.99995875
 HV4321!UTM  18      -   0.99999030  x   0.99999099  =   0.99998129
 HV4321
 HV4321_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2180816664(NAD 83)
 HV4321
 HV4321                          SUPERSEDED SURVEY CONTROL
 HV4321
 HV4321  NAD 83(1991)-  38 58 51.07544(N)    077 03 25.85954(W) AD(       ) 2
 HV4321  NAD 83(1986)-  38 58 51.07513(N)    077 03 25.86952(W) AD(       ) 2
 HV4321  NAD 27      -  38 58 50.68000(N)    077 03 26.94750(W) AD(       ) 2
 HV4321
 HV4321.Superseded values are not recommended for survey control.
 HV4321
 HV4321.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4321.See file dsdata.pdf to determine how the superseded data were derived.
 HV4321
 HV4321_MARKER: Z = SEE DESCRIPTION
 HV4321_SETTING: 0 = UNSPECIFIED SETTING
 HV4321_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4321
 HV4321  HISTORY     - Date     Condition        Report By
 HV4321  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4321  HISTORY     - 1971     GOOD             NGS
 HV4321
 HV4321                          STATION DESCRIPTION
 HV4321
 HV4321'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4321'THE STATION AND ALL REFERENCE POINTS RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4322 ***********************************************************************
 HV4322  DESIGNATION -  N W 101 F 1960
 HV4322  PID         -  HV4322
 HV4322  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4322  COUNTRY     -  US
 HV4322  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4322
 HV4322                         *CURRENT SURVEY CONTROL
 HV4322  ______________________________________________________________________
 HV4322* NAD 83(1993) POSITION- 38 58 54.20706(N) 077 03 25.30262(W)   ADJUSTED
 HV4322* NAVD 88 ORTHO HEIGHT -    98.    (meters)      322.    (feet) SCALED
 HV4322  ______________________________________________________________________
 HV4322  GEOID HEIGHT    -        -31.940 (meters)                     GEOID18
 HV4322  LAPLACE CORR    -         -2.88  (seconds)                    DEFLEC18
 HV4322  HORZ ORDER      -  SECOND
 HV4322
 HV4322.The horizontal coordinates were established by classical geodetic methods
 HV4322.and adjusted by the National Geodetic Survey in November 1994.
 HV4322
 HV4322.The orthometric height was scaled from a topographic map.
 HV4322
 HV4322.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4322.GEOID18 height accuracy estimate available here.
 HV4322
 HV4322.Click photographs - Photos may exist for this station.
 HV4322
 HV4322.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4322
 HV4322. The following values were computed from the NAD 83(1993) position.
 HV4322
 HV4322;                    North         East     Units Scale Factor Converg.
 HV4322;SPC MD       -   145,978.954   395,058.795   MT  0.99995155   -0 02 08.9
 HV4322;SPC MD       -   478,932.62  1,296,122.06   sFT  0.99995155   -0 02 08.9
 HV4322;SPC VA N     - 2,146,954.973 3,625,022.500   MT  0.99996854   +0 54 02.1
 HV4322;SPC VA N     - 7,043,801.44 11,893,094.65   sFT  0.99996854   +0 54 02.1
 HV4322;UTM  18      - 4,316,761.020   321,824.412   MT  0.99999092   -1 17 39.7
 HV4322
 HV4322!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4322!SPC MD       -   0.99998967  x   0.99995155  =   0.99994122
 HV4322!SPC VA N     -   0.99998967  x   0.99996854  =   0.99995821
 HV4322!UTM  18      -   0.99998967  x   0.99999092  =   0.99998059
 HV4322
 HV4322:                Primary Azimuth Mark                     Grid Az
 HV4322:SPC MD       -  MEDICAL CENTER                           304 36 10.9
 HV4322:SPC VA N     -  MEDICAL CENTER                           303 39 59.9
 HV4322:UTM  18      -  MEDICAL CENTER                           305 51 41.7
 HV4322
 HV4322_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2182416761(NAD 83)
 HV4322
 HV4322|---------------------------------------------------------------------|
 HV4322| PID    Reference Object                     Distance      Geod. Az  |
 HV4322|                                                           dddmmss.s |
 HV4322| HV4321 N W 101 E 1960                       97.473 METERS 18753     |
 HV4322| JV4314 MEDICAL CENTER                      APPROX. 3.9 KM 3043402.0 |
 HV4322|---------------------------------------------------------------------|
 HV4322
 HV4322                          SUPERSEDED SURVEY CONTROL
 HV4322
 HV4322  NAD 83(1991)-  38 58 54.20640(N)    077 03 25.30357(W) AD(       ) 2
 HV4322  NAD 83(1986)-  38 58 54.20610(N)    077 03 25.31354(W) AD(       ) 2
 HV4322  NAD 27      -  38 58 53.81160(N)    077 03 26.39160(W) AD(       ) 2
 HV4322
 HV4322.Superseded values are not recommended for survey control.
 HV4322
 HV4322.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4322.See file dsdata.pdf to determine how the superseded data were derived.
 HV4322
 HV4322_MARKER: Z = SEE DESCRIPTION
 HV4322_SETTING: 0 = UNSPECIFIED SETTING
 HV4322_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4322
 HV4322  HISTORY     - Date     Condition        Report By
 HV4322  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4322  HISTORY     - 1971     GOOD             NGS
 HV4322
 HV4322                          STATION DESCRIPTION
 HV4322
 HV4322'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4322'THE STATION AND ALL REFERENCE POINTS WERE RECOVERED AS
 HV4322'DESCRIBED.  THE STATION IS ALSO 18.8 FEET SOUTH OF THE CENTERLINE
 HV4322'OF A DRIVEWAY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4278 ***********************************************************************
 HV4278  DESIGNATION -  N W 102 A 1960
 HV4278  PID         -  HV4278
 HV4278  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4278  COUNTRY     -  US
 HV4278  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4278
 HV4278                         *CURRENT SURVEY CONTROL
 HV4278  ______________________________________________________________________
 HV4278* NAD 83(1993) POSITION- 38 57 58.39345(N) 077 03 42.27707(W)   ADJUSTED
 HV4278* NAVD 88 ORTHO HEIGHT -    91.    (meters)      299.    (feet) SCALED
 HV4278  ______________________________________________________________________
 HV4278  GEOID HEIGHT    -        -31.944 (meters)                     GEOID18
 HV4278  LAPLACE CORR    -         -2.97  (seconds)                    DEFLEC18
 HV4278  HORZ ORDER      -  SECOND
 HV4278
 HV4278.The horizontal coordinates were established by classical geodetic methods
 HV4278.and adjusted by the National Geodetic Survey in November 1994.
 HV4278
 HV4278.The orthometric height was scaled from a topographic map.
 HV4278
 HV4278.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4278.GEOID18 height accuracy estimate available here.
 HV4278
 HV4278.Click photographs - Photos may exist for this station.
 HV4278
 HV4278.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4278
 HV4278. The following values were computed from the NAD 83(1993) position.
 HV4278
 HV4278;                    North         East     Units Scale Factor Converg.
 HV4278;SPC MD       -   144,258.152   394,649.091   MT  0.99995109   -0 02 19.5
 HV4278;SPC MD       -   473,286.95  1,294,777.89   sFT  0.99995109   -0 02 19.5
 HV4278;SPC VA N     - 2,145,227.677 3,624,640.967   MT  0.99996686   +0 53 51.5
 HV4278;SPC VA N     - 7,038,134.47 11,891,842.91   sFT  0.99996686   +0 53 51.5
 HV4278;UTM  18      - 4,315,049.561   321,376.999   MT  0.99999289   -1 17 48.8
 HV4278
 HV4278!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4278!SPC MD       -   0.99999077  x   0.99995109  =   0.99994186
 HV4278!SPC VA N     -   0.99999077  x   0.99996686  =   0.99995763
 HV4278!UTM  18      -   0.99999077  x   0.99999289  =   0.99998366
 HV4278
 HV4278_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2137615049(NAD 83)
 HV4278
 HV4278|---------------------------------------------------------------------|
 HV4278| PID    Reference Object                     Distance      Geod. Az  |
 HV4278|                                                           dddmmss.s |
 HV4278| HV2130 NW 102 DCDHT                        217.777 METERS 04259     |
 HV4278| HV4226 N W 102 B 1960                      331.020 METERS 21213     |
 HV4278|---------------------------------------------------------------------|
 HV4278
 HV4278                          SUPERSEDED SURVEY CONTROL
 HV4278
 HV4278  NAD 83(1991)-  38 57 58.39270(N)    077 03 42.27808(W) AD(       ) 2
 HV4278  NAD 83(1986)-  38 57 58.39236(N)    077 03 42.28809(W) AD(       ) 2
 HV4278  NAD 27      -  38 57 57.99500(N)    077 03 43.36300(W) AD(       ) 2
 HV4278
 HV4278.Superseded values are not recommended for survey control.
 HV4278
 HV4278.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4278.See file dsdata.pdf to determine how the superseded data were derived.
 HV4278
 HV4278_MARKER: Z = SEE DESCRIPTION
 HV4278_SETTING: 0 = UNSPECIFIED SETTING
 HV4278_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4278
 HV4278  HISTORY     - Date     Condition        Report By
 HV4278  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4278  HISTORY     - 1971     SEE DESCRIPTION  NGS
 HV4278
 HV4278                          STATION DESCRIPTION
 HV4278
 HV4278'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4278'STATION LOCATION IS UNDER NEW PAVEMENT AND WAS NOT DUG UP.  POLE
 HV4278'NO. 13934 HAS BEEN REPLACED AND THE WASHER AND NAIL NOT
 HV4278'RECOVERED.  THE OTHER TWO REFERENCE POINTS RECOVERED AS SHOWN.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4226 ***********************************************************************
 HV4226  DESIGNATION -  N W 102 B 1960
 HV4226  PID         -  HV4226
 HV4226  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4226  COUNTRY     -  US
 HV4226  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4226
 HV4226                         *CURRENT SURVEY CONTROL
 HV4226  ______________________________________________________________________
 HV4226* NAD 83(1993) POSITION- 38 57 49.31128(N) 077 03 49.60634(W)   ADJUSTED
 HV4226* NAVD 88 ORTHO HEIGHT -    98.    (meters)      322.    (feet) SCALED
 HV4226  ______________________________________________________________________
 HV4226  GEOID HEIGHT    -        -31.943 (meters)                     GEOID18
 HV4226  LAPLACE CORR    -         -2.97  (seconds)                    DEFLEC18
 HV4226  HORZ ORDER      -  SECOND
 HV4226
 HV4226.The horizontal coordinates were established by classical geodetic methods
 HV4226.and adjusted by the National Geodetic Survey in November 1994.
 HV4226
 HV4226.The orthometric height was scaled from a topographic map.
 HV4226
 HV4226.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4226.GEOID18 height accuracy estimate available here.
 HV4226
 HV4226.Click photographs - Photos may exist for this station.
 HV4226
 HV4226.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4226
 HV4226. The following values were computed from the NAD 83(1993) position.
 HV4226
 HV4226;                    North         East     Units Scale Factor Converg.
 HV4226;SPC MD       -   143,978.216   394,472.457   MT  0.99995102   -0 02 24.1
 HV4226;SPC MD       -   472,368.53  1,294,198.39   sFT  0.99995102   -0 02 24.1
 HV4226;SPC VA N     - 2,144,944.887 3,624,468.929   MT  0.99996660   +0 53 46.9
 HV4226;SPC VA N     - 7,037,206.68 11,891,278.48   sFT  0.99996660   +0 53 46.9
 HV4226;UTM  18      - 4,314,773.559   321,194.253   MT  0.99999370   -1 17 53.2
 HV4226
 HV4226!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4226!SPC MD       -   0.99998967  x   0.99995102  =   0.99994069
 HV4226!SPC VA N     -   0.99998967  x   0.99996660  =   0.99995627
 HV4226!UTM  18      -   0.99998967  x   0.99999370  =   0.99998337
 HV4226
 HV4226_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2119414773(NAD 83)
 HV4226
 HV4226|---------------------------------------------------------------------|
 HV4226| PID    Reference Object                     Distance      Geod. Az  |
 HV4226|                                                           dddmmss.s |
 HV4226| HV4278 N W 102 A 1960                      331.020 METERS 03213     |
 HV4226|---------------------------------------------------------------------|
 HV4226
 HV4226                          SUPERSEDED SURVEY CONTROL
 HV4226
 HV4226  NAD 83(1991)-  38 57 49.31052(N)    077 03 49.60738(W) AD(       ) 2
 HV4226  NAD 83(1986)-  38 57 49.31019(N)    077 03 49.61740(W) AD(       ) 2
 HV4226  NAD 27      -  38 57 48.91270(N)    077 03 50.69220(W) AD(       ) 2
 HV4226
 HV4226.Superseded values are not recommended for survey control.
 HV4226
 HV4226.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4226.See file dsdata.pdf to determine how the superseded data were derived.
 HV4226
 HV4226_MARKER: N = NAIL
 HV4226_SETTING: 0 = UNSPECIFIED SETTING
 HV4226_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4226
 HV4226  HISTORY     - Date     Condition        Report By
 HV4226  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4226  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4226
 HV4226                          STATION DESCRIPTION
 HV4226
 HV4226'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4226'ALL REFERENCE POINTS RECOVERED AS SHOWN.  THE STATION IS UNDER
 HV4226'SURFACE OF PAVED ROAD AND WAS NOT DUG UP.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4205 ***********************************************************************
 HV4205  DESIGNATION -  N W 102 C 1960
 HV4205  PID         -  HV4205
 HV4205  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4205  COUNTRY     -  US
 HV4205  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4205
 HV4205                         *CURRENT SURVEY CONTROL
 HV4205  ______________________________________________________________________
 HV4205* NAD 83(1993) POSITION- 38 57 32.41027(N) 077 04 04.06278(W)   ADJUSTED
 HV4205* NAVD 88 ORTHO HEIGHT -    72.    (meters)      236.    (feet) SCALED
 HV4205  ______________________________________________________________________
 HV4205  GEOID HEIGHT    -        -31.942 (meters)                     GEOID18
 HV4205  LAPLACE CORR    -         -2.95  (seconds)                    DEFLEC18
 HV4205  HORZ ORDER      -  SECOND
 HV4205
 HV4205.The horizontal coordinates were established by classical geodetic methods
 HV4205.and adjusted by the National Geodetic Survey in November 1994.
 HV4205
 HV4205.The orthometric height was scaled from a topographic map.
 HV4205
 HV4205.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4205.GEOID18 height accuracy estimate available here.
 HV4205
 HV4205.Click photographs - Photos may exist for this station.
 HV4205
 HV4205.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4205
 HV4205. The following values were computed from the NAD 83(1993) position.
 HV4205
 HV4205;                    North         East     Units Scale Factor Converg.
 HV4205;SPC MD       -   143,457.309   394,124.046   MT  0.99995090   -0 02 33.2
 HV4205;SPC MD       -   470,659.52  1,293,055.31   sFT  0.99995090   -0 02 33.2
 HV4205;SPC VA N     - 2,144,418.347 3,624,129.072   MT  0.99996611   +0 53 37.9
 HV4205;SPC VA N     - 7,035,479.19 11,890,163.46   sFT  0.99996611   +0 53 37.9
 HV4205;UTM  18      - 4,314,260.405   320,834.474   MT  0.99999528   -1 18 01.8
 HV4205
 HV4205!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4205!SPC MD       -   0.99999375  x   0.99995090  =   0.99994465
 HV4205!SPC VA N     -   0.99999375  x   0.99996611  =   0.99995986
 HV4205!UTM  18      -   0.99999375  x   0.99999528  =   0.99998903
 HV4205
 HV4205:                Primary Azimuth Mark                     Grid Az
 HV4205:SPC MD       -  N W 102 B 1960                           033 46 36.4
 HV4205:SPC VA N     -  N W 102 B 1960                           032 50 25.3
 HV4205:UTM  18      -  N W 102 B 1960                           035 02 05.0
 HV4205
 HV4205_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2083414260(NAD 83)
 HV4205
 HV4205|---------------------------------------------------------------------|
 HV4205| PID    Reference Object                     Distance      Geod. Az  |
 HV4205|                                                           dddmmss.s |
 HV4205| HV4226 N W 102 B 1960                      APPROX. 0.6 KM 0334403.2 |
 HV4205| HV4199 N W 102 D 1960                      381.247 METERS 21537     |
 HV4205|---------------------------------------------------------------------|
 HV4205
 HV4205                          SUPERSEDED SURVEY CONTROL
 HV4205
 HV4205  NAD 83(1991)-  38 57 32.40951(N)    077 04 04.06385(W) AD(       ) 2
 HV4205  NAD 83(1986)-  38 57 32.40919(N)    077 04 04.07389(W) AD(       ) 2
 HV4205  NAD 27      -  38 57 32.01160(N)    077 04 05.14830(W) AD(       ) 2
 HV4205
 HV4205.Superseded values are not recommended for survey control.
 HV4205
 HV4205.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4205.See file dsdata.pdf to determine how the superseded data were derived.
 HV4205
 HV4205_MARKER: Z = SEE DESCRIPTION
 HV4205_SETTING: 0 = UNSPECIFIED SETTING
 HV4205_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4205
 HV4205  HISTORY     - Date     Condition        Report By
 HV4205  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4205  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4205
 HV4205                          STATION DESCRIPTION
 HV4205
 HV4205'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4205'STATION WAS NOT RECOVERED.  ITS LOCATION FALLS UNDER THE SURFACE
 HV4205'OF NEW MACADAM ON ROAD SURFACE.  P.E.P.C.O. POLE NO. 120326 HAS
 HV4205'BEEN REPLACED, THE OTHER REFERENCE POINTS REMAIN AS SHOWN.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4199 ***********************************************************************
 HV4199  DESIGNATION -  N W 102 D 1960
 HV4199  PID         -  HV4199
 HV4199  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4199  COUNTRY     -  US
 HV4199  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4199
 HV4199                         *CURRENT SURVEY CONTROL
 HV4199  ______________________________________________________________________
 HV4199* NAD 83(1993) POSITION- 38 57 22.36000(N) 077 04 13.28428(W)   ADJUSTED
 HV4199* NAVD 88 ORTHO HEIGHT -    91.    (meters)      299.    (feet) SCALED
 HV4199  ______________________________________________________________________
 HV4199  GEOID HEIGHT    -        -31.941 (meters)                     GEOID18
 HV4199  LAPLACE CORR    -         -2.91  (seconds)                    DEFLEC18
 HV4199  HORZ ORDER      -  SECOND
 HV4199
 HV4199.The horizontal coordinates were established by classical geodetic methods
 HV4199.and adjusted by the National Geodetic Survey in November 1994.
 HV4199
 HV4199.The orthometric height was scaled from a topographic map.
 HV4199
 HV4199.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4199.GEOID18 height accuracy estimate available here.
 HV4199
 HV4199.Click photographs - Photos may exist for this station.
 HV4199
 HV4199.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4199
 HV4199. The following values were computed from the NAD 83(1993) position.
 HV4199
 HV4199;                    North         East     Units Scale Factor Converg.
 HV4199;SPC MD       -   143,147.568   393,901.794   MT  0.99995083   -0 02 39.0
 HV4199;SPC MD       -   469,643.31  1,292,326.14   sFT  0.99995083   -0 02 39.0
 HV4199;SPC VA N     - 2,144,105.011 3,623,911.908   MT  0.99996582   +0 53 32.2
 HV4199;SPC VA N     - 7,034,451.19 11,889,450.98   sFT  0.99996582   +0 53 32.2
 HV4199;UTM  18      - 4,313,955.604   320,605.466   MT  0.99999629   -1 18 07.3
 HV4199
 HV4199!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4199!SPC MD       -   0.99999077  x   0.99995083  =   0.99994160
 HV4199!SPC VA N     -   0.99999077  x   0.99996582  =   0.99995659
 HV4199!UTM  18      -   0.99999077  x   0.99999629  =   0.99998706
 HV4199
 HV4199_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2060513955(NAD 83)
 HV4199
 HV4199|---------------------------------------------------------------------|
 HV4199| PID    Reference Object                     Distance      Geod. Az  |
 HV4199|                                                           dddmmss.s |
 HV4199| HV4205 N W 102 C 1960                      381.247 METERS 03537     |
 HV4199| HV2146 NW 115 B DCDHT                      288.265 METERS 15524     |
 HV4199| HV4094 N W 102 E 1960                      374.199 METERS 33522     |
 HV4199|---------------------------------------------------------------------|
 HV4199
 HV4199                          SUPERSEDED SURVEY CONTROL
 HV4199
 HV4199  NAD 83(1991)-  38 57 22.35925(N)    077 04 13.28537(W) AD(       ) 2
 HV4199  NAD 83(1986)-  38 57 22.35893(N)    077 04 13.29543(W) AD(       ) 2
 HV4199  NAD 27      -  38 57 21.96130(N)    077 04 14.36980(W) AD(       ) 2
 HV4199
 HV4199.Superseded values are not recommended for survey control.
 HV4199
 HV4199.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4199.See file dsdata.pdf to determine how the superseded data were derived.
 HV4199
 HV4199_MARKER: Z = SEE DESCRIPTION
 HV4199_SETTING: 0 = UNSPECIFIED SETTING
 HV4199_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4199
 HV4199  HISTORY     - Date     Condition        Report By
 HV4199  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4199  HISTORY     - 1966     GOOD             LOCENG
 HV4199  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4199
 HV4199                          STATION DESCRIPTION
 HV4199
 HV4199'DESCRIBED BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (CJM)
 HV4199'RECOVERED BY DE LEUW CATHER CO.
 HV4199'
 HV4199'GOOD
 HV4199
 HV4199                          STATION RECOVERY (1971)
 HV4199
 HV4199'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4199'THE STATION WAS LOST WHEN SIDEWALK WAS IMPROVED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4094 ***********************************************************************
 HV4094  DESIGNATION -  N W 102 E 1960
 HV4094  PID         -  HV4094
 HV4094  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4094  COUNTRY     -  US
 HV4094  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4094
 HV4094                         *CURRENT SURVEY CONTROL
 HV4094  ______________________________________________________________________
 HV4094* NAD 83(1993) POSITION- 38 57 33.39017(N) 077 04 19.76238(W)   ADJUSTED
 HV4094* NAVD 88 ORTHO HEIGHT -    98.    (meters)      322.    (feet) SCALED
 HV4094  ______________________________________________________________________
 HV4094  GEOID HEIGHT    -        -31.935 (meters)                     GEOID18
 HV4094  LAPLACE CORR    -         -2.85  (seconds)                    DEFLEC18
 HV4094  HORZ ORDER      -  SECOND
 HV4094
 HV4094.The horizontal coordinates were established by classical geodetic methods
 HV4094.and adjusted by the National Geodetic Survey in November 1994.
 HV4094
 HV4094.The orthometric height was scaled from a topographic map.
 HV4094
 HV4094.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4094.GEOID18 height accuracy estimate available here.
 HV4094
 HV4094.Click photographs - Photos may exist for this station.
 HV4094
 HV4094.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4094
 HV4094. The following values were computed from the NAD 83(1993) position.
 HV4094
 HV4094;                    North         East     Units Scale Factor Converg.
 HV4094;SPC MD       -   143,487.814   393,746.093   MT  0.99995091   -0 02 43.0
 HV4094;SPC MD       -   470,759.60  1,291,815.31   sFT  0.99995091   -0 02 43.0
 HV4094;SPC VA N     - 2,144,442.673 3,623,750.665   MT  0.99996613   +0 53 28.1
 HV4094;SPC VA N     - 7,035,559.00 11,888,921.97   sFT  0.99996613   +0 53 28.1
 HV4094;UTM  18      - 4,314,299.202   320,457.265   MT  0.99999695   -1 18 11.7
 HV4094
 HV4094!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4094!SPC MD       -   0.99998967  x   0.99995091  =   0.99994058
 HV4094!SPC VA N     -   0.99998967  x   0.99996613  =   0.99995580
 HV4094!UTM  18      -   0.99998967  x   0.99999695  =   0.99998662
 HV4094
 HV4094_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2045714299(NAD 83)
 HV4094
 HV4094|---------------------------------------------------------------------|
 HV4094| PID    Reference Object                     Distance      Geod. Az  |
 HV4094|                                                           dddmmss.s |
 HV4094| HV4199 N W 102 D 1960                      374.199 METERS 15522     |
 HV4094| HV2147 NW 103                              216.991 METERS 33619     |
 HV4094|---------------------------------------------------------------------|
 HV4094
 HV4094                          SUPERSEDED SURVEY CONTROL
 HV4094
 HV4094  NAD 83(1991)-  38 57 33.38939(N)    077 04 19.76344(W) AD(       ) 2
 HV4094  NAD 83(1986)-  38 57 33.38908(N)    077 04 19.77348(W) AD(       ) 2
 HV4094  NAD 27      -  38 57 32.99130(N)    077 04 20.84720(W) AD(       ) 2
 HV4094
 HV4094.Superseded values are not recommended for survey control.
 HV4094
 HV4094.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4094.See file dsdata.pdf to determine how the superseded data were derived.
 HV4094
 HV4094_MARKER: Z = SEE DESCRIPTION
 HV4094_SETTING: 0 = UNSPECIFIED SETTING
 HV4094_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4094
 HV4094  HISTORY     - Date     Condition        Report By
 HV4094  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4094  HISTORY     - 1966     GOOD             LOCENG
 HV4094  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4094
 HV4094                          STATION DESCRIPTION
 HV4094
 HV4094'DESCRIBED BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (CJM)
 HV4094'RECOVERED BY DE LEUW CATHER CO.
 HV4094'
 HV4094'GOOD
 HV4094
 HV4094                          STATION RECOVERY (1971)
 HV4094
 HV4094'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4094'THE STATION WAS NOT RECOVERED.  THE SIDEWALK HAS BEEN REPLACED AND
 HV4094'REFERENCE POINTS DESTROYED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4169 ***********************************************************************
 HV4169  DESIGNATION -  N W 103 A 1960
 HV4169  PID         -  HV4169
 HV4169  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4169  COUNTRY     -  US
 HV4169  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4169
 HV4169                         *CURRENT SURVEY CONTROL
 HV4169  ______________________________________________________________________
 HV4169* NAD 83(1993) POSITION- 38 57 39.48953(N) 077 04 53.15633(W)   ADJUSTED
 HV4169* NAVD 88 ORTHO HEIGHT -   107.    (meters)      351.    (feet) SCALED
 HV4169  ______________________________________________________________________
 HV4169  GEOID HEIGHT    -        -31.920 (meters)                     GEOID18
 HV4169  LAPLACE CORR    -         -2.56  (seconds)                    DEFLEC18
 HV4169  HORZ ORDER      -  SECOND
 HV4169
 HV4169.The horizontal coordinates were established by classical geodetic methods
 HV4169.and adjusted by the National Geodetic Survey in November 1994.
 HV4169
 HV4169.The orthometric height was scaled from a topographic map.
 HV4169
 HV4169.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4169.GEOID18 height accuracy estimate available here.
 HV4169
 HV4169.Click photographs - Photos may exist for this station.
 HV4169
 HV4169.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4169
 HV4169. The following values were computed from the NAD 83(1993) position.
 HV4169
 HV4169;                    North         East     Units Scale Factor Converg.
 HV4169;SPC MD       -   143,676.570   392,942.285   MT  0.99995095   -0 03 04.0
 HV4169;SPC MD       -   471,378.88  1,289,178.15   sFT  0.99995095   -0 03 04.0
 HV4169;SPC VA N     - 2,144,618.269 3,622,943.867   MT  0.99996631   +0 53 07.3
 HV4169;SPC VA N     - 7,036,135.10 11,886,275.00   sFT  0.99996631   +0 53 07.3
 HV4169;UTM  18      - 4,314,505.569   319,657.756   MT  1.00000049   -1 18 32.9
 HV4169
 HV4169!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4169!SPC MD       -   0.99998825  x   0.99995095  =   0.99993920
 HV4169!SPC VA N     -   0.99998825  x   0.99996631  =   0.99995456
 HV4169!UTM  18      -   0.99998825  x   1.00000049  =   0.99998874
 HV4169
 HV4169:                Primary Azimuth Mark                     Grid Az
 HV4169:SPC MD       -  NW 103                                   089 11 55.9
 HV4169:SPC VA N     -  NW 103                                   088 15 44.6
 HV4169:UTM  18      -  NW 103                                   090 27 24.8
 HV4169
 HV4169_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1965714505(NAD 83)
 HV4169
 HV4169|---------------------------------------------------------------------|
 HV4169| PID    Reference Object                     Distance      Geod. Az  |
 HV4169|                                                           dddmmss.s |
 HV4169| HV2147 NW 103                              APPROX. 0.7 KM 0890851.9 |
 HV4169| HV2153 NW 104                              305.746 METERS 27355     |
 HV4169|---------------------------------------------------------------------|
 HV4169
 HV4169                          SUPERSEDED SURVEY CONTROL
 HV4169
 HV4169  NAD 83(1991)-  38 57 39.48875(N)    077 04 53.15733(W) AD(       ) 2
 HV4169  NAD 83(1986)-  38 57 39.48846(N)    077 04 53.16733(W) AD(       ) 2
 HV4169  NAD 27      -  38 57 39.09090(N)    077 04 54.23930(W) AD(       ) 2
 HV4169
 HV4169.Superseded values are not recommended for survey control.
 HV4169
 HV4169.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4169.See file dsdata.pdf to determine how the superseded data were derived.
 HV4169
 HV4169_MARKER: DS = TRIANGULATION STATION DISK
 HV4169_SETTING: 0 = UNSPECIFIED SETTING
 HV4169_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4169
 HV4169  HISTORY     - Date     Condition        Report By
 HV4169  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4169  HISTORY     - 1970     GOOD             NGS
 HV4169
 HV4169                          STATION DESCRIPTION
 HV4169
 HV4169'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4169'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4169'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N. W. 103-A
 HV4169'GROUTED IN CONCRETE WALK.
 HV4169
 HV4169                          STATION RECOVERY (1970)
 HV4169
 HV4169'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1970 (LFS)
 HV4169'STATION RECOVERED AS SHOWN IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV3972 ***********************************************************************
 HV3972  DESIGNATION -  N W 104 A 1960
 HV3972  PID         -  HV3972
 HV3972  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV3972  COUNTRY     -  US
 HV3972  USGS QUAD   -  WASHINGTON WEST (2016)
 HV3972
 HV3972                         *CURRENT SURVEY CONTROL
 HV3972  ______________________________________________________________________
 HV3972* NAD 83(1993) POSITION- 38 57 31.19562(N) 077 05 18.75970(W)   ADJUSTED
 HV3972* NAVD 88 ORTHO HEIGHT -    91.    (meters)      299.    (feet) SCALED
 HV3972  ______________________________________________________________________
 HV3972  GEOID HEIGHT    -        -31.913 (meters)                     GEOID18
 HV3972  LAPLACE CORR    -         -2.38  (seconds)                    DEFLEC18
 HV3972  HORZ ORDER      -  SECOND
 HV3972
 HV3972.The horizontal coordinates were established by classical geodetic methods
 HV3972.and adjusted by the National Geodetic Survey in November 1994.
 HV3972
 HV3972.The orthometric height was scaled from a topographic map.
 HV3972
 HV3972.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV3972.GEOID18 height accuracy estimate available here.
 HV3972
 HV3972.Click photographs - Photos may exist for this station.
 HV3972
 HV3972.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV3972
 HV3972. The following values were computed from the NAD 83(1993) position.
 HV3972
 HV3972;                    North         East     Units Scale Factor Converg.
 HV3972;SPC MD       -   143,421.394   392,325.638   MT  0.99995089   -0 03 20.1
 HV3972;SPC MD       -   470,541.69  1,287,155.03   sFT  0.99995089   -0 03 20.1
 HV3972;SPC VA N     - 2,144,353.044 3,622,331.464   MT  0.99996607   +0 52 51.3
 HV3972;SPC VA N     - 7,035,264.95 11,884,265.81   sFT  0.99996607   +0 52 51.3
 HV3972;UTM  18      - 4,314,263.981   319,035.624   MT  1.00000326   -1 18 48.8
 HV3972
 HV3972!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV3972!SPC MD       -   0.99999076  x   0.99995089  =   0.99994165
 HV3972!SPC VA N     -   0.99999076  x   0.99996607  =   0.99995683
 HV3972!UTM  18      -   0.99999076  x   1.00000326  =   0.99999402
 HV3972
 HV3972:                Primary Azimuth Mark                     Grid Az
 HV3972:SPC MD       -  N W 105 1960                             225 01 34.1
 HV3972:SPC VA N     -  N W 105 1960                             224 05 22.7
 HV3972:UTM  18      -  N W 105 1960                             226 17 02.8
 HV3972
 HV3972_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1903514263(NAD 83)
 HV3972
 HV3972|---------------------------------------------------------------------|
 HV3972| PID    Reference Object                     Distance      Geod. Az  |
 HV3972|                                                           dddmmss.s |
 HV3972| HV2153 NW 104                              416.511 METERS 0482306.2 |
 HV3972| HV3975 NW 105 RESET                        328.247 METERS 22236     |
 HV3972| HV3983 N W 105 1960                        485.283 METERS 2245814.0 |
 HV3972| HV3974 N W 104 B 1960                      165.169 METERS 35015     |
 HV3972|---------------------------------------------------------------------|
 HV3972
 HV3972                          SUPERSEDED SURVEY CONTROL
 HV3972
 HV3972  NAD 83(1991)-  38 57 31.19487(N)    077 05 18.76070(W) AD(       ) 2
 HV3972  NAD 83(1986)-  38 57 31.19461(N)    077 05 18.77061(W) AD(       ) 2
 HV3972  NAD 27      -  38 57 30.79670(N)    077 05 19.84320(W) AD(       ) 2
 HV3972
 HV3972.Superseded values are not recommended for survey control.
 HV3972
 HV3972.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV3972.See file dsdata.pdf to determine how the superseded data were derived.
 HV3972
 HV3972_MARKER: DS = TRIANGULATION STATION DISK
 HV3972_SETTING: 0 = UNSPECIFIED SETTING
 HV3972_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV3972
 HV3972  HISTORY     - Date     Condition        Report By
 HV3972  HISTORY     - 1960     MONUMENTED       MADHOP
 HV3972  HISTORY     - 1965     MARK NOT FOUND   CGS
 HV3972  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV3972
 HV3972                          STATION DESCRIPTION
 HV3972
 HV3972'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV3972'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV3972'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N. W. 104-A
 HV3972'GROUTED IN CONCRETE CURB.
 HV3972
 HV3972                          STATION RECOVERY (1965)
 HV3972
 HV3972'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1965 (JRM)
 HV3972'WESTERN AVE. N.W. HAS BEEN WIDENED IN THE VICINITY OF
 HV3972'N.W. 104-A.  THE MONUMENT WAS EITHER REMOVED OR RESET BELOW THE
 HV3972'ROADWAY PAVEMENT.
 HV3972
 HV3972                          STATION RECOVERY (1971)
 HV3972
 HV3972'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV3972'THIS STATION WAS LOST WHEN EXTRA TRAFFIC LANE WAS ADDED TO THE
 HV3972'NORTH SIDE OF WESTERN AVE. N.W.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV3983 ***********************************************************************
 HV3983  DESIGNATION -  N W 105 1960
 HV3983  PID         -  HV3983
 HV3983  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV3983  COUNTRY     -  US
 HV3983  USGS QUAD   -  WASHINGTON WEST (2016)
 HV3983
 HV3983                         *CURRENT SURVEY CONTROL
 HV3983  ______________________________________________________________________
 HV3983* NAD 83(1993) POSITION- 38 57 20.06204(N) 077 05 33.00389(W)   ADJUSTED
 HV3983* NAVD 88 ORTHO HEIGHT -    91.    (meters)      299.    (feet) SCALED
 HV3983  ______________________________________________________________________
 HV3983  GEOID HEIGHT    -        -31.912 (meters)                     GEOID18
 HV3983  LAPLACE CORR    -         -2.28  (seconds)                    DEFLEC18
 HV3983  HORZ ORDER      -  SECOND
 HV3983
 HV3983.The horizontal coordinates were established by classical geodetic methods
 HV3983.and adjusted by the National Geodetic Survey in November 1994.
 HV3983
 HV3983.The orthometric height was scaled from a topographic map.
 HV3983
 HV3983.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV3983.GEOID18 height accuracy estimate available here.
 HV3983
 HV3983.Click photographs - Photos may exist for this station.
 HV3983
 HV3983.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV3983
 HV3983. The following values were computed from the NAD 83(1993) position.
 HV3983
 HV3983;                    North         East     Units Scale Factor Converg.
 HV3983;SPC MD       -   143,078.420   391,982.351   MT  0.99995081   -0 03 29.0
 HV3983;SPC MD       -   469,416.45  1,286,028.76   sFT  0.99995081   -0 03 29.0
 HV3983;SPC VA N     - 2,144,004.500 3,621,993.823   MT  0.99996575   +0 52 42.4
 HV3983;SPC VA N     - 7,034,121.43 11,883,158.07   sFT  0.99996575   +0 52 42.4
 HV3983;UTM  18      - 4,313,928.608   318,684.872   MT  1.00000483   -1 18 57.4
 HV3983
 HV3983!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV3983!SPC MD       -   0.99999076  x   0.99995081  =   0.99994157
 HV3983!SPC VA N     -   0.99999076  x   0.99996575  =   0.99995651
 HV3983!UTM  18      -   0.99999076  x   1.00000483  =   0.99999559
 HV3983
 HV3983_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1868413928(NAD 83)
 HV3983
 HV3983                          SUPERSEDED SURVEY CONTROL
 HV3983
 HV3983  NAD 83(1991)-  38 57 20.06126(N)    077 05 33.00497(W) AD(       ) 2
 HV3983  NAD 83(1986)-  38 57 20.06124(N)    077 05 33.01459(W) AD(       ) 2
 HV3983  NAD 27      -  38 57 19.66320(N)    077 05 34.08680(W) AD(       ) 2
 HV3983
 HV3983.Superseded values are not recommended for survey control.
 HV3983
 HV3983.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV3983.See file dsdata.pdf to determine how the superseded data were derived.
 HV3983
 HV3983_MARKER: DS = TRIANGULATION STATION DISK
 HV3983_SETTING: 0 = UNSPECIFIED SETTING
 HV3983_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV3983
 HV3983  HISTORY     - Date     Condition        Report By
 HV3983  HISTORY     - 1960     MONUMENTED       MADHOP
 HV3983  HISTORY     - 1960     MARK NOT FOUND   CGS
 HV3983
 HV3983                          STATION DESCRIPTION
 HV3983
 HV3983'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV3983'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV3983'DEPARTMENT OF HIGHWAYS AND TRAFFIC - NO NW 105 SET IN TOP OF 12 IN
 HV3983'CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID
 HV3983'LABELED SURVEY.
 HV3983
 HV3983                          STATION RECOVERY (1960)
 HV3983
 HV3983'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV3983'NOTE-- THIS STATION HAS BEEN DESTROYED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV3988 ***********************************************************************
 HV3988  DESIGNATION -  N W 105 A 1960
 HV3988  PID         -  HV3988
 HV3988  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV3988  COUNTRY     -  US
 HV3988  USGS QUAD   -  WASHINGTON WEST (2016)
 HV3988
 HV3988                         *CURRENT SURVEY CONTROL
 HV3988  ______________________________________________________________________
 HV3988* NAD 83(1993) POSITION- 38 57 06.30195(N) 077 05 49.86631(W)   ADJUSTED
 HV3988* NAVD 88 ORTHO HEIGHT -    91.    (meters)      299.    (feet) SCALED
 HV3988  ______________________________________________________________________
 HV3988  GEOID HEIGHT    -        -31.911 (meters)                     GEOID18
 HV3988  LAPLACE CORR    -         -2.13  (seconds)                    DEFLEC18
 HV3988  HORZ ORDER      -  SECOND
 HV3988
 HV3988.The horizontal coordinates were established by classical geodetic methods
 HV3988.and adjusted by the National Geodetic Survey in November 1994.
 HV3988
 HV3988.The orthometric height was scaled from a topographic map.
 HV3988
 HV3988.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV3988.GEOID18 height accuracy estimate available here.
 HV3988
 HV3988.Click photographs - Photos may exist for this station.
 HV3988
 HV3988.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV3988
 HV3988. The following values were computed from the NAD 83(1993) position.
 HV3988
 HV3988;                    North         East     Units Scale Factor Converg.
 HV3988;SPC MD       -   142,654.538   391,575.907   MT  0.99995072   -0 03 39.6
 HV3988;SPC MD       -   468,025.76  1,284,695.29   sFT  0.99995072   -0 03 39.6
 HV3988;SPC VA N     - 2,143,574.025 3,621,594.356   MT  0.99996536   +0 52 31.9
 HV3988;SPC VA N     - 7,032,709.11 11,881,847.48   sFT  0.99996536   +0 52 31.9
 HV3988;UTM  18      - 4,313,513.727   318,269.198   MT  1.00000668   -1 19 07.6
 HV3988
 HV3988!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV3988!SPC MD       -   0.99999076  x   0.99995072  =   0.99994148
 HV3988!SPC VA N     -   0.99999076  x   0.99996536  =   0.99995612
 HV3988!UTM  18      -   0.99999076  x   1.00000668  =   0.99999744
 HV3988
 HV3988:                Primary Azimuth Mark                     Grid Az
 HV3988:SPC MD       -  N W 105 1960                             043 47 48.6
 HV3988:SPC VA N     -  N W 105 1960                             042 51 37.1
 HV3988:UTM  18      -  N W 105 1960                             045 03 16.6
 HV3988
 HV3988_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1826913513(NAD 83)
 HV3988
 HV3988|---------------------------------------------------------------------|
 HV3988| PID    Reference Object                     Distance      Geod. Az  |
 HV3988|                                                           dddmmss.s |
 HV3988| HV3983 N W 105 1960                        APPROX. 0.6 KM 0434409.0 |
 HV3988| HV2151 NW 106 DCDHT                        452.680 METERS 2255744.7 |
 HV3988|---------------------------------------------------------------------|
 HV3988
 HV3988                          SUPERSEDED SURVEY CONTROL
 HV3988
 HV3988  NAD 83(1991)-  38 57 06.30113(N)    077 05 49.86746(W) AD(       ) 2
 HV3988  NAD 83(1986)-  38 57 06.30135(N)    077 05 49.87679(W) AD(       ) 2
 HV3988  NAD 27      -  38 57 05.90320(N)    077 05 50.94820(W) AD(       ) 2
 HV3988
 HV3988.Superseded values are not recommended for survey control.
 HV3988
 HV3988.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV3988.See file dsdata.pdf to determine how the superseded data were derived.
 HV3988
 HV3988_MARKER: Z = SEE DESCRIPTION
 HV3988_SETTING: 0 = UNSPECIFIED SETTING
 HV3988_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV3988
 HV3988  HISTORY     - Date     Condition        Report By
 HV3988  HISTORY     - 1960     MONUMENTED       MADHOP
 HV3988  HISTORY     - 1971     GOOD             NGS
 HV3988
 HV3988                          STATION DESCRIPTION
 HV3988
 HV3988'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV3988'THE STATION AND REFERENCE POINTS WERE RECOVERED IN GOOD
 HV3988'CONDITION.  IT IS 0.25 MILE NORTHWEST OF THE EAST EDGE OF THE
 HV3988'WESTMORELAND CIRCLE.  THE DISTANCE TO REFERENCE POINT ON
 HV3988'P.E.P.C.O. POLE 24981 SHOULD READ 23.65 FEET INSTEAD OF 23.27
 HV3988'FEET.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4050 ***********************************************************************
 HV4050  DESIGNATION -  N W 106 A 1960
 HV4050  PID         -  HV4050
 HV4050  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4050  COUNTRY     -  US
 HV4050  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4050
 HV4050                         *CURRENT SURVEY CONTROL
 HV4050  ______________________________________________________________________
 HV4050* NAD 83(1993) POSITION- 38 56 53.48535(N) 077 06 06.44491(W)   ADJUSTED
 HV4050* NAVD 88 ORTHO HEIGHT -    88.    (meters)      289.    (feet) SCALED
 HV4050  ______________________________________________________________________
 HV4050  GEOID HEIGHT    -        -31.910 (meters)                     GEOID18
 HV4050  LAPLACE CORR    -         -1.94  (seconds)                    DEFLEC18
 HV4050  HORZ ORDER      -  SECOND
 HV4050
 HV4050.The horizontal coordinates were established by classical geodetic methods
 HV4050.and adjusted by the National Geodetic Survey in November 1994.
 HV4050
 HV4050.The orthometric height was scaled from a topographic map.
 HV4050
 HV4050.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4050.GEOID18 height accuracy estimate available here.
 HV4050
 HV4050.Click photographs - Photos may exist for this station.
 HV4050
 HV4050.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4050
 HV4050. The following values were computed from the NAD 83(1993) position.
 HV4050
 HV4050;                    North         East     Units Scale Factor Converg.
 HV4050;SPC MD       -   142,259.762   391,176.287   MT  0.99995064   -0 03 50.0
 HV4050;SPC MD       -   466,730.57  1,283,384.20   sFT  0.99995064   -0 03 50.0
 HV4050;SPC VA N     - 2,143,172.765 3,621,201.236   MT  0.99996500   +0 52 21.5
 HV4050;SPC VA N     - 7,031,392.65 11,880,557.72   sFT  0.99996500   +0 52 21.5
 HV4050;UTM  18      - 4,313,127.797   317,860.986   MT  1.00000851   -1 19 17.7
 HV4050
 HV4050!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4050!SPC MD       -   0.99999123  x   0.99995064  =   0.99994187
 HV4050!SPC VA N     -   0.99999123  x   0.99996500  =   0.99995623
 HV4050!UTM  18      -   0.99999123  x   1.00000851  =   0.99999974
 HV4050
 HV4050_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1786013127(NAD 83)
 HV4050
 HV4050|---------------------------------------------------------------------|
 HV4050| PID    Reference Object                     Distance      Geod. Az  |
 HV4050|                                                           dddmmss.s |
 HV4050| HV2151 NW 106 DCDHT                        109.242 METERS 04230     |
 HV4050| HV4062 N W 106 B 1960                      340.230 METERS 20715     |
 HV4050|---------------------------------------------------------------------|
 HV4050
 HV4050                          SUPERSEDED SURVEY CONTROL
 HV4050
 HV4050  NAD 83(1991)-  38 56 53.48445(N)    077 06 06.44621(W) AD(       ) 2
 HV4050  NAD 83(1986)-  38 56 53.48474(N)    077 06 06.45540(W) AD(       ) 2
 HV4050  NAD 27      -  38 56 53.08600(N)    077 06 07.52690(W) AD(       ) 2
 HV4050
 HV4050.Superseded values are not recommended for survey control.
 HV4050
 HV4050.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4050.See file dsdata.pdf to determine how the superseded data were derived.
 HV4050
 HV4050_MARKER: Z = SEE DESCRIPTION
 HV4050_SETTING: 0 = UNSPECIFIED SETTING
 HV4050_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4050
 HV4050  HISTORY     - Date     Condition        Report By
 HV4050  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4050  HISTORY     - 1971     SEE DESCRIPTION  NGS
 HV4050
 HV4050                          STATION DESCRIPTION
 HV4050
 HV4050'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4050'STATION RECOVERED IN GOOD CONDITION AND IS FLUSH WITH GROUND
 HV4050'SURFACE.  ALL RAMSET NAILS SET FOR REFERENCE POINTS ARE
 HV4050'GONE.  HOWEVER, THE IMPRINTS OF THEIR LOCATION REMAINS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4062 ***********************************************************************
 HV4062  DESIGNATION -  N W 106 B 1960
 HV4062  PID         -  HV4062
 HV4062  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4062  COUNTRY     -  US
 HV4062  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4062
 HV4062                         *CURRENT SURVEY CONTROL
 HV4062  ______________________________________________________________________
 HV4062* NAD 83(1993) POSITION- 38 56 43.67740(N) 077 06 12.91561(W)   ADJUSTED
 HV4062* NAVD 88 ORTHO HEIGHT -    58.    (meters)      190.    (feet) SCALED
 HV4062  ______________________________________________________________________
 HV4062  GEOID HEIGHT    -        -31.912 (meters)                     GEOID18
 HV4062  LAPLACE CORR    -         -1.83  (seconds)                    DEFLEC18
 HV4062  HORZ ORDER      -  SECOND
 HV4062
 HV4062.The horizontal coordinates were established by classical geodetic methods
 HV4062.and adjusted by the National Geodetic Survey in November 1994.
 HV4062
 HV4062.The orthometric height was scaled from a topographic map.
 HV4062
 HV4062.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4062.GEOID18 height accuracy estimate available here.
 HV4062
 HV4062.Click photographs - Photos may exist for this station.
 HV4062
 HV4062.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4062
 HV4062. The following values were computed from the NAD 83(1993) position.
 HV4062
 HV4062;                    North         East     Units Scale Factor Converg.
 HV4062;SPC MD       -   141,957.502   391,020.134   MT  0.99995058   -0 03 54.1
 HV4062;SPC MD       -   465,738.90  1,282,871.89   sFT  0.99995058   -0 03 54.1
 HV4062;SPC VA N     - 2,142,867.988 3,621,050.042   MT  0.99996473   +0 52 17.5
 HV4062;SPC VA N     - 7,030,392.72 11,880,061.68   sFT  0.99996473   +0 52 17.5
 HV4062;UTM  18      - 4,312,829.018   317,698.227   MT  1.00000924   -1 19 21.5
 HV4062
 HV4062!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4062!SPC MD       -   0.99999594  x   0.99995058  =   0.99994652
 HV4062!SPC VA N     -   0.99999594  x   0.99996473  =   0.99996067
 HV4062!UTM  18      -   0.99999594  x   1.00000924  =   1.00000518
 HV4062
 HV4062:                Primary Azimuth Mark                     Grid Az
 HV4062:SPC MD       -  NW 107 DCDHT                             181 20 38.7
 HV4062:SPC VA N     -  NW 107 DCDHT                             180 24 27.1
 HV4062:UTM  18      -  NW 107 DCDHT                             182 36 06.1
 HV4062
 HV4062_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1769812829(NAD 83)
 HV4062
 HV4062|---------------------------------------------------------------------|
 HV4062| PID    Reference Object                     Distance      Geod. Az  |
 HV4062|                                                           dddmmss.s |
 HV4062| HV4050 N W 106 A 1960                      340.230 METERS 02715     |
 HV4062| HV2171 NW 107 DCDHT                        APPROX. 0.5 KM 1811644.6 |
 HV4062|---------------------------------------------------------------------|
 HV4062
 HV4062                          SUPERSEDED SURVEY CONTROL
 HV4062
 HV4062  NAD 83(1991)-  38 56 43.67647(N)    077 06 12.91695(W) AD(       ) 2
 HV4062  NAD 83(1986)-  38 56 43.67659(N)    077 06 12.92624(W) AD(       ) 2
 HV4062  NAD 27      -  38 56 43.27750(N)    077 06 13.99770(W) AD(       ) 2
 HV4062
 HV4062.Superseded values are not recommended for survey control.
 HV4062
 HV4062.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4062.See file dsdata.pdf to determine how the superseded data were derived.
 HV4062
 HV4062_MARKER: DS = TRIANGULATION STATION DISK
 HV4062_SETTING: 0 = UNSPECIFIED SETTING
 HV4062_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4062
 HV4062  HISTORY     - Date     Condition        Report By
 HV4062  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4062  HISTORY     - 1971     GOOD             NGS
 HV4062
 HV4062                          STATION DESCRIPTION
 HV4062
 HV4062'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4062'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4062'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NW 106-B SET IN TOP
 HV4062'OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER
 HV4062'WITH LID LABELED SURVEY.  THIS STATION IS AZIMUTH MARK FOR NW 107.
 HV4062
 HV4062                          STATION RECOVERY (1971)
 HV4062
 HV4062'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4062'THE STATION AND ALL REFERENCE POINTS WERE RECOVERED IN GOOD
 HV4062'CONDITION AS SHOWN ON SKETCH.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4058 ***********************************************************************
 HV4058  DESIGNATION -  N W 107 A 1960
 HV4058  PID         -  HV4058
 HV4058  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4058  COUNTRY     -  US
 HV4058  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4058
 HV4058                         *CURRENT SURVEY CONTROL
 HV4058  ______________________________________________________________________
 HV4058* NAD 83(1993) POSITION- 38 56 19.48578(N) 077 06 14.19201(W)   ADJUSTED
 HV4058* NAVD 88 ORTHO HEIGHT -    61.    (meters)      200.    (feet) SCALED
 HV4058  ______________________________________________________________________
 HV4058  GEOID HEIGHT    -        -31.919 (meters)                     GEOID18
 HV4058  LAPLACE CORR    -         -1.69  (seconds)                    DEFLEC18
 HV4058  HORZ ORDER      -  SECOND
 HV4058
 HV4058.The horizontal coordinates were established by classical geodetic methods
 HV4058.and adjusted by the National Geodetic Survey in November 1994.
 HV4058
 HV4058.The orthometric height was scaled from a topographic map.
 HV4058
 HV4058.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4058.GEOID18 height accuracy estimate available here.
 HV4058
 HV4058.Click photographs - Photos may exist for this station.
 HV4058
 HV4058.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4058
 HV4058. The following values were computed from the NAD 83(1993) position.
 HV4058
 HV4058;                    North         East     Units Scale Factor Converg.
 HV4058;SPC MD       -   141,211.569   390,988.549   MT  0.99995045   -0 03 54.9
 HV4058;SPC MD       -   463,291.62  1,282,768.26   sFT  0.99995045   -0 03 54.9
 HV4058;SPC VA N     - 2,142,121.628 3,621,030.653   MT  0.99996406   +0 52 16.7
 HV4058;SPC VA N     - 7,027,944.04 11,879,998.07   sFT  0.99996406   +0 52 16.7
 HV4058;UTM  18      - 4,312,083.915   317,650.276   MT  1.00000946   -1 19 21.6
 HV4058
 HV4058!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4058!SPC MD       -   0.99999547  x   0.99995045  =   0.99994592
 HV4058!SPC VA N     -   0.99999547  x   0.99996406  =   0.99995953
 HV4058!UTM  18      -   0.99999547  x   1.00000946  =   1.00000493
 HV4058
 HV4058_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1765012083(NAD 83)
 HV4058
 HV4058|---------------------------------------------------------------------|
 HV4058| PID    Reference Object                     Distance      Geod. Az  |
 HV4058|                                                           dddmmss.s |
 HV4058| HV2171 NW 107 DCDHT                        241.650 METERS 00437     |
 HV4058| HV4063 N W 107 B 1960                      374.368 METERS 20900     |
 HV4058|---------------------------------------------------------------------|
 HV4058
 HV4058                          SUPERSEDED SURVEY CONTROL
 HV4058
 HV4058  NAD 83(1991)-  38 56 19.48484(N)    077 06 14.19339(W) AD(       ) 2
 HV4058  NAD 83(1986)-  38 56 19.48473(N)    077 06 14.20273(W) AD(       ) 2
 HV4058  NAD 27      -  38 56 19.08520(N)    077 06 15.27390(W) AD(       ) 2
 HV4058
 HV4058.Superseded values are not recommended for survey control.
 HV4058
 HV4058.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4058.See file dsdata.pdf to determine how the superseded data were derived.
 HV4058
 HV4058_MARKER: Z = SEE DESCRIPTION
 HV4058_SETTING: 0 = UNSPECIFIED SETTING
 HV4058_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4058
 HV4058  HISTORY     - Date     Condition        Report By
 HV4058  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4058  HISTORY     - 1971     SEE DESCRIPTION  NGS
 HV4058
 HV4058                          STATION DESCRIPTION
 HV4058
 HV4058'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4058'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE
 HV4058'ORIGINAL DESCRIPTION IS ADEQUATE.
 HV4058'
 HV4058'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4058'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4063 ***********************************************************************
 HV4063  DESIGNATION -  N W 107 B 1960
 HV4063  PID         -  HV4063
 HV4063  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4063  COUNTRY     -  US
 HV4063  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4063
 HV4063                         *CURRENT SURVEY CONTROL
 HV4063  ______________________________________________________________________
 HV4063* NAD 83(1993) POSITION- 38 56 08.86718(N) 077 06 21.72654(W)   ADJUSTED
 HV4063* NAVD 88 ORTHO HEIGHT -    76.    (meters)      249.    (feet) SCALED
 HV4063  ______________________________________________________________________
 HV4063  GEOID HEIGHT    -        -31.921 (meters)                     GEOID18
 HV4063  LAPLACE CORR    -         -1.69  (seconds)                    DEFLEC18
 HV4063  HORZ ORDER      -  SECOND
 HV4063
 HV4063.The horizontal coordinates were established by classical geodetic methods
 HV4063.and adjusted by the National Geodetic Survey in November 1994.
 HV4063
 HV4063.The orthometric height was scaled from a topographic map.
 HV4063
 HV4063.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4063.GEOID18 height accuracy estimate available here.
 HV4063
 HV4063.Click photographs - Photos may exist for this station.
 HV4063
 HV4063.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4063
 HV4063. The following values were computed from the NAD 83(1993) position.
 HV4063
 HV4063;                    North         East     Units Scale Factor Converg.
 HV4063;SPC MD       -   140,884.345   390,806.719   MT  0.99995039   -0 03 59.6
 HV4063;SPC MD       -   462,218.06  1,282,171.71   sFT  0.99995039   -0 03 59.6
 HV4063;SPC VA N     - 2,141,791.472 3,620,854.194   MT  0.99996378   +0 52 12.0
 HV4063;SPC VA N     - 7,026,860.85 11,879,419.13   sFT  0.99996378   +0 52 12.0
 HV4063;UTM  18      - 4,311,760.741   317,461.298   MT  1.00001031   -1 19 26.0
 HV4063
 HV4063!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4063!SPC MD       -   0.99999312  x   0.99995039  =   0.99994351
 HV4063!SPC VA N     -   0.99999312  x   0.99996378  =   0.99995690
 HV4063!UTM  18      -   0.99999312  x   1.00001031  =   1.00000343
 HV4063
 HV4063_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1746111760(NAD 83)
 HV4063
 HV4063|---------------------------------------------------------------------|
 HV4063| PID    Reference Object                     Distance      Geod. Az  |
 HV4063|                                                           dddmmss.s |
 HV4063| HV4058 N W 107 A 1960                      374.368 METERS 02900     |
 HV4063| HV4076 N W 107 C 1960                      265.822 METERS 27000     |
 HV4063|---------------------------------------------------------------------|
 HV4063
 HV4063                          SUPERSEDED SURVEY CONTROL
 HV4063
 HV4063  NAD 83(1991)-  38 56 08.86620(N)    077 06 21.72796(W) AD(       ) 2
 HV4063  NAD 83(1986)-  38 56 08.86593(N)    077 06 21.73743(W) AD(       ) 2
 HV4063  NAD 27      -  38 56 08.46600(N)    077 06 22.80830(W) AD(       ) 2
 HV4063
 HV4063.Superseded values are not recommended for survey control.
 HV4063
 HV4063.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4063.See file dsdata.pdf to determine how the superseded data were derived.
 HV4063
 HV4063_MARKER: N = NAIL
 HV4063_SETTING: 0 = UNSPECIFIED SETTING
 HV4063_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4063
 HV4063  HISTORY     - Date     Condition        Report By
 HV4063  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4063  HISTORY     - 1971     GOOD             NGS
 HV4063
 HV4063                          STATION DESCRIPTION
 HV4063
 HV4063'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4063'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE
 HV4063'ORIGINAL DESCRIPTION IS ADEQUATE.
 HV4063'
 HV4063'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4063'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4076 ***********************************************************************
 HV4076  DESIGNATION -  N W 107 C 1960
 HV4076  PID         -  HV4076
 HV4076  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4076  COUNTRY     -  US
 HV4076  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4076
 HV4076                         *CURRENT SURVEY CONTROL
 HV4076  ______________________________________________________________________
 HV4076* NAD 83(1993) POSITION- 38 56 08.86727(N) 077 06 32.76356(W)   ADJUSTED
 HV4076* NAVD 88 ORTHO HEIGHT -    69.    (meters)      226.    (feet) SCALED
 HV4076  ______________________________________________________________________
 HV4076  GEOID HEIGHT    -        -31.919 (meters)                     GEOID18
 HV4076  LAPLACE CORR    -         -1.75  (seconds)                    DEFLEC18
 HV4076  HORZ ORDER      -  SECOND
 HV4076
 HV4076.The horizontal coordinates were established by classical geodetic methods
 HV4076.and adjusted by the National Geodetic Survey in November 1994.
 HV4076
 HV4076.The orthometric height was scaled from a topographic map.
 HV4076
 HV4076.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4076.GEOID18 height accuracy estimate available here.
 HV4076
 HV4076.Click photographs - Photos may exist for this station.
 HV4076
 HV4076.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4076
 HV4076. The following values were computed from the NAD 83(1993) position.
 HV4076
 HV4076;                    North         East     Units Scale Factor Converg.
 HV4076;SPC MD       -   140,884.661   390,540.910   MT  0.99995039   -0 04 06.5
 HV4076;SPC MD       -   462,219.09  1,281,299.64   sFT  0.99995039   -0 04 06.5
 HV4076;SPC VA N     - 2,141,787.443 3,620,588.411   MT  0.99996378   +0 52 05.1
 HV4076;SPC VA N     - 7,026,847.64 11,878,547.15   sFT  0.99996378   +0 52 05.1
 HV4076;UTM  18      - 4,311,766.890   317,195.544   MT  1.00001151   -1 19 33.0
 HV4076
 HV4076!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4076!SPC MD       -   0.99999422  x   0.99995039  =   0.99994461
 HV4076!SPC VA N     -   0.99999422  x   0.99996378  =   0.99995800
 HV4076!UTM  18      -   0.99999422  x   1.00001151  =   1.00000573
 HV4076
 HV4076_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1719511766(NAD 83)
 HV4076
 HV4076|---------------------------------------------------------------------|
 HV4076| PID    Reference Object                     Distance      Geod. Az  |
 HV4076|                                                           dddmmss.s |
 HV4076| HV4063 N W 107 B 1960                      265.822 METERS 09000     |
 HV4076| HV3978 N W 107 D 1960                      396.671 METERS 29852     |
 HV4076|---------------------------------------------------------------------|
 HV4076
 HV4076                          SUPERSEDED SURVEY CONTROL
 HV4076
 HV4076  NAD 83(1991)-  38 56 08.86630(N)    077 06 32.76510(W) AD(       ) 2
 HV4076  NAD 83(1986)-  38 56 08.86603(N)    077 06 32.77480(W) AD(       ) 2
 HV4076  NAD 27      -  38 56 08.46600(N)    077 06 33.84600(W) AD(       ) 2
 HV4076
 HV4076.Superseded values are not recommended for survey control.
 HV4076
 HV4076.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4076.See file dsdata.pdf to determine how the superseded data were derived.
 HV4076
 HV4076_MARKER: Z = SEE DESCRIPTION
 HV4076_SETTING: 0 = UNSPECIFIED SETTING
 HV4076_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4076
 HV4076  HISTORY     - Date     Condition        Report By
 HV4076  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4076  HISTORY     - 1961     GOOD             CGS
 HV4076  HISTORY     - 1971     GOOD             NGS
 HV4076
 HV4076                          STATION DESCRIPTION
 HV4076
 HV4076'DESCRIBED BY COAST AND GEODETIC SURVEY 1961 (JLA)
 HV4076'STATION WAS RECOVERED AS DESCRIBED AND FOUND TO BE IN GOOD
 HV4076'CONDITION.  DISTANCES TO THE TWO REFERENCE POINTS ON THE WEST
 HV4076'SIDE OF LOUGHBORO RD. NW DID NOT CHECK.  DIRECT MEASUREMENT TO
 HV4076'THE NAIL IN THE TREE SOUTH OF THE STATION IS 20.70 FEET AND
 HV4076'DIRECT MARK TO MARK MEASUREMENT TO THE TREE NORTH OF THE STATION
 HV4076'IS 45.90 FEET.
 HV4076
 HV4076                          STATION RECOVERY (1971)
 HV4076
 HV4076'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4076'STATION MARK WAS RECOVERED IN GOOD CONDITION, HOWEVER THE NAILS
 HV4076'AND WASHERS CAN NO LONGER BE SEEN AS THE TREES HAVE GROWN OVER
 HV4076'THEM.  STATION IS 6 FEET EAST OF LINE EXTENDED FROM WEST SIDE
 HV4076'OF HOUSE (ADDRESS 5246 LOUGHBORO RD.)
 HV4076'
 HV4076'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4076'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV3978 ***********************************************************************
 HV3978  DESIGNATION -  N W 107 D 1960
 HV3978  PID         -  HV3978
 HV3978  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV3978  COUNTRY     -  US
 HV3978  USGS QUAD   -  WASHINGTON WEST (2016)
 HV3978
 HV3978                         *CURRENT SURVEY CONTROL
 HV3978  ______________________________________________________________________
 HV3978* NAD 83(1993) POSITION- 38 56 15.07759(N) 077 06 47.18698(W)   ADJUSTED
 HV3978* NAVD 88 ORTHO HEIGHT -    45.    (meters)      148.    (feet) SCALED
 HV3978  ______________________________________________________________________
 HV3978  GEOID HEIGHT    -        -31.913 (meters)                     GEOID18
 HV3978  LAPLACE CORR    -         -1.85  (seconds)                    DEFLEC18
 HV3978  HORZ ORDER      -  SECOND
 HV3978
 HV3978.The horizontal coordinates were established by classical geodetic methods
 HV3978.and adjusted by the National Geodetic Survey in November 1994.
 HV3978
 HV3978.The orthometric height was scaled from a topographic map.
 HV3978
 HV3978.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV3978.GEOID18 height accuracy estimate available here.
 HV3978
 HV3978.Click photographs - Photos may exist for this station.
 HV3978
 HV3978.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV3978
 HV3978. The following values were computed from the NAD 83(1993) position.
 HV3978
 HV3978;                    North         East     Units Scale Factor Converg.
 HV3978;SPC MD       -   141,076.584   390,193.782   MT  0.99995043   -0 04 15.6
 HV3978;SPC MD       -   462,848.76  1,280,160.77   sFT  0.99995043   -0 04 15.6
 HV3978;SPC VA N     - 2,141,973.668 3,620,238.188   MT  0.99996395   +0 51 56.1
 HV3978;SPC VA N     - 7,027,458.61 11,877,398.12   sFT  0.99996395   +0 51 56.1
 HV3978;UTM  18      - 4,311,966.396   316,852.690   MT  1.00001305   -1 19 42.2
 HV3978
 HV3978!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV3978!SPC MD       -   0.99999798  x   0.99995043  =   0.99994841
 HV3978!SPC VA N     -   0.99999798  x   0.99996395  =   0.99996193
 HV3978!UTM  18      -   0.99999798  x   1.00001305  =   1.00001103
 HV3978
 HV3978_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1685211966(NAD 83)
 HV3978
 HV3978|---------------------------------------------------------------------|
 HV3978| PID    Reference Object                     Distance      Geod. Az  |
 HV3978|                                                           dddmmss.s |
 HV3978| HV4076 N W 107 C 1960                      396.671 METERS 11852     |
 HV3978| HV2169 NW 108                              285.138 METERS 19849     |
 HV3978|---------------------------------------------------------------------|
 HV3978
 HV3978                          SUPERSEDED SURVEY CONTROL
 HV3978
 HV3978  NAD 83(1991)-  38 56 15.07665(N)    077 06 47.18860(W) AD(       ) 2
 HV3978  NAD 83(1986)-  38 56 15.07644(N)    077 06 47.19840(W) AD(       ) 2
 HV3978  NAD 27      -  38 56 14.67640(N)    077 06 48.26950(W) AD(       ) 2
 HV3978
 HV3978.Superseded values are not recommended for survey control.
 HV3978
 HV3978.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV3978.See file dsdata.pdf to determine how the superseded data were derived.
 HV3978
 HV3978_MARKER: N = NAIL
 HV3978_SETTING: 0 = UNSPECIFIED SETTING
 HV3978_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV3978
 HV3978  HISTORY     - Date     Condition        Report By
 HV3978  HISTORY     - 1960     MONUMENTED       MADHOP
 HV3978  HISTORY     - 1961     GOOD             CGS
 HV3978  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV3978
 HV3978                          STATION DESCRIPTION
 HV3978
 HV3978'DESCRIBED BY COAST AND GEODETIC SURVEY 1961 (JLA)
 HV3978'STATION WAS RECOVERED AS DESCRIBED AND THE MARK WAS FOUND TO BE
 HV3978'IN GOOD CONDITION.  STATION WAS OCCUPIED ECCENTRICALLY AT THIS
 HV3978'TIME.  DISTANCE TO THE ECCENTRIC SETUP IS 11.221 METERS (36.82
 HV3978'FEET).
 HV3978
 HV3978                          STATION RECOVERY (1971)
 HV3978
 HV3978'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV3978'THE ROOF HAS BEEN TARRED SO STATION NAIL WAS NOT FOUND, HOWEVER
 HV3978'THE TOWER AND RAILING IS STILL THE SAME AND STATION COULD BE
 HV3978'UNCOVERED IF NEEDED, BY USING THE PUBLISHED REFERENCE DISTANCES.
 HV3978'
 HV3978'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV3978'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4101 ***********************************************************************
 HV4101  DESIGNATION -  N W 110 A 1960
 HV4101  PID         -  HV4101
 HV4101  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4101  COUNTRY     -  US
 HV4101  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4101
 HV4101                         *CURRENT SURVEY CONTROL
 HV4101  ______________________________________________________________________
 HV4101* NAD 83(1993) POSITION- 38 54 18.43141(N) 077 04 16.11535(W)   ADJUSTED
 HV4101* NAVD 88 ORTHO HEIGHT -    30.    (meters)       98.    (feet) SCALED
 HV4101  ______________________________________________________________________
 HV4101  GEOID HEIGHT    -        -32.013 (meters)                     GEOID18
 HV4101  LAPLACE CORR    -         -2.83  (seconds)                    DEFLEC18
 HV4101  HORZ ORDER      -  SECOND
 HV4101
 HV4101.The horizontal coordinates were established by classical geodetic methods
 HV4101.and adjusted by the National Geodetic Survey in November 1994.
 HV4101
 HV4101.The orthometric height was scaled from a topographic map.
 HV4101
 HV4101.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4101.GEOID18 height accuracy estimate available here.
 HV4101
 HV4101.Click photographs - Photos may exist for this station.
 HV4101
 HV4101.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4101
 HV4101. The following values were computed from the NAD 83(1993) position.
 HV4101
 HV4101;                    North         East     Units Scale Factor Converg.
 HV4101;SPC MD       -   137,476.049   393,829.212   MT  0.99994998   -0 02 40.7
 HV4101;SPC MD       -   451,036.00  1,292,088.01   sFT  0.99994998   -0 02 40.7
 HV4101;SPC VA N     - 2,138,432.990 3,623,932.026   MT  0.99996095   +0 53 30.4
 HV4101;SPC VA N     - 7,015,842.23 11,889,516.99   sFT  0.99996095   +0 53 30.4
 HV4101;UTM  18      - 4,308,286.780   320,408.460   MT  0.99999717   -1 18 03.9
 HV4101
 HV4101!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4101!SPC MD       -   1.00000035  x   0.99994998  =   0.99995033
 HV4101!SPC VA N     -   1.00000035  x   0.99996095  =   0.99996130
 HV4101!UTM  18      -   1.00000035  x   0.99999717  =   0.99999752
 HV4101
 HV4101:                Primary Azimuth Mark                     Grid Az
 HV4101:SPC MD       -  NW 110 DCDHT                             277 03 31.3
 HV4101:SPC VA N     -  NW 110 DCDHT                             276 07 20.2
 HV4101:UTM  18      -  NW 110 DCDHT                             278 18 54.5
 HV4101
 HV4101_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2040808286(NAD 83)
 HV4101
 HV4101|---------------------------------------------------------------------|
 HV4101| PID    Reference Object                     Distance      Geod. Az  |
 HV4101|                                                           dddmmss.s |
 HV4101| HV2175 WASH BASE USE 1956                  230.161 METERS 12709     |
 HV4101| HV2167 NW 110 DCDHT                        APPROX. 0.7 KM 2770050.6 |
 HV4101|---------------------------------------------------------------------|
 HV4101
 HV4101                          SUPERSEDED SURVEY CONTROL
 HV4101
 HV4101  NAD 83(1991)-  38 54 18.43018(N)    077 04 16.11694(W) AD(       ) 2
 HV4101  NAD 83(1986)-  38 54 18.42978(N)    077 04 16.12699(W) AD(       ) 2
 HV4101  NAD 27      -  38 54 18.02740(N)    077 04 17.20310(W) AD(       ) 2
 HV4101
 HV4101.Superseded values are not recommended for survey control.
 HV4101
 HV4101.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4101.See file dsdata.pdf to determine how the superseded data were derived.
 HV4101
 HV4101_MARKER: Z = SEE DESCRIPTION
 HV4101_SETTING: 0 = UNSPECIFIED SETTING
 HV4101_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4101
 HV4101  HISTORY     - Date     Condition        Report By
 HV4101  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4101  HISTORY     - 1971     GOOD             NGS
 HV4101
 HV4101                          STATION DESCRIPTION
 HV4101
 HV4101'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4101'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE
 HV4101'ORIGINAL DESCRIPTION IS ADEQUATE, WITH THE FOLLOWING
 HV4101'ADDITION--STATION PIPE IS IN A 10-INCH-DIAMETER, DIRT-FILLED HOLE
 HV4101'IN THE MACADAM SIDEWALK.
 HV4101'
 HV4101'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4101'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4204 ***********************************************************************
 HV4204  DESIGNATION -  N W 111 A 1960
 HV4204  PID         -  HV4204
 HV4204  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4204  COUNTRY     -  US
 HV4204  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4204
 HV4204                         *CURRENT SURVEY CONTROL
 HV4204  ______________________________________________________________________
 HV4204* NAD 83(1993) POSITION- 38 54 20.87382(N) 077 04 08.25727(W)   ADJUSTED
 HV4204* NAVD 88 ORTHO HEIGHT -    34.    (meters)      112.    (feet) SCALED
 HV4204  ______________________________________________________________________
 HV4204  GEOID HEIGHT    -        -32.015 (meters)                     GEOID18
 HV4204  LAPLACE CORR    -         -2.81  (seconds)                    DEFLEC18
 HV4204  HORZ ORDER      -  SECOND
 HV4204
 HV4204.The horizontal coordinates were established by classical geodetic methods
 HV4204.and adjusted by the National Geodetic Survey in November 1994.
 HV4204
 HV4204.The orthometric height was scaled from a topographic map.
 HV4204
 HV4204.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4204.GEOID18 height accuracy estimate available here.
 HV4204
 HV4204.Click photographs - Photos may exist for this station.
 HV4204
 HV4204.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4204
 HV4204. The following values were computed from the NAD 83(1993) position.
 HV4204
 HV4204;                    North         East     Units Scale Factor Converg.
 HV4204;SPC MD       -   137,551.217   394,018.599   MT  0.99994998   -0 02 35.8
 HV4204;SPC MD       -   451,282.62  1,292,709.35   sFT  0.99994998   -0 02 35.8
 HV4204;SPC VA N     - 2,138,511.244 3,624,120.162   MT  0.99996101   +0 53 35.3
 HV4204;SPC VA N     - 7,016,098.97 11,890,134.23   sFT  0.99996101   +0 53 35.3
 HV4204;UTM  18      - 4,308,357.780   320,599.459   MT  0.99999633   -1 17 59.1
 HV4204
 HV4204!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4204!SPC MD       -   0.99999973  x   0.99994998  =   0.99994971
 HV4204!SPC VA N     -   0.99999973  x   0.99996101  =   0.99996074
 HV4204!UTM  18      -   0.99999973  x   0.99999633  =   0.99999606
 HV4204
 HV4204:                Primary Azimuth Mark                     Grid Az
 HV4204:SPC MD       -  NW 112 DCDHT                             358 05 29.8
 HV4204:SPC VA N     -  NW 112 DCDHT                             357 09 18.7
 HV4204:UTM  18      -  NW 112 DCDHT                             359 20 53.1
 HV4204
 HV4204_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2059908357(NAD 83)
 HV4204
 HV4204|---------------------------------------------------------------------|
 HV4204| PID    Reference Object                     Distance      Geod. Az  |
 HV4204|                                                           dddmmss.s |
 HV4204| HV2175 WASH BASE USE 1956                  214.412 METERS 18135     |
 HV4204| HV2166 NW 112 DCDHT                        APPROX. 1.4 KM 3580254.0 |
 HV4204|---------------------------------------------------------------------|
 HV4204
 HV4204                          SUPERSEDED SURVEY CONTROL
 HV4204
 HV4204  NAD 83(1991)-  38 54 20.87261(N)    077 04 08.25881(W) AD(       ) 2
 HV4204  NAD 83(1986)-  38 54 20.87236(N)    077 04 08.26874(W) AD(       ) 2
 HV4204  NAD 27      -  38 54 20.47010(N)    077 04 09.34500(W) AD(       ) 2
 HV4204
 HV4204.Superseded values are not recommended for survey control.
 HV4204
 HV4204.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4204.See file dsdata.pdf to determine how the superseded data were derived.
 HV4204
 HV4204_MARKER: Z = SEE DESCRIPTION
 HV4204_SETTING: 0 = UNSPECIFIED SETTING
 HV4204_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4204
 HV4204  HISTORY     - Date     Condition        Report By
 HV4204  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4204  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4204
 HV4204                          STATION DESCRIPTION
 HV4204
 HV4204'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4204'STATION PIPE WAS SEARCHED FOR BUT NOT FOUND.  THE DISTANCES FROM
 HV4204'THE 2 CROSSES ON MANHOLE RIMS APPEAR TO BE CORRECT, BUT THE
 HV4204'DISTANCE FROM THE BUILDING CORNER SEEMS ERRONEOUS.  THE STREET
 HV4204'WHERE IT IS BELIEVED STATION SHOULD BE IS COBBLESTONE, BUT NO PIPE
 HV4204'COULD BE FOUND IN THE CRACKS BETWEEN STONES.
 HV4204'
 HV4204'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4204'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4077 ***********************************************************************
 HV4077  DESIGNATION -  N W 112 A 1960
 HV4077  PID         -  HV4077
 HV4077  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4077  COUNTRY     -  US
 HV4077  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4077
 HV4077                         *CURRENT SURVEY CONTROL
 HV4077  ______________________________________________________________________
 HV4077* NAD 83(1993) POSITION- 38 55 12.66296(N) 077 04 16.85144(W)   ADJUSTED
 HV4077* NAVD 88 ORTHO HEIGHT -    80.    (meters)      262.    (feet) SCALED
 HV4077  ______________________________________________________________________
 HV4077  GEOID HEIGHT    -        -31.984 (meters)                     GEOID18
 HV4077  LAPLACE CORR    -         -2.87  (seconds)                    DEFLEC18
 HV4077  HORZ ORDER      -  SECOND
 HV4077
 HV4077.The horizontal coordinates were established by classical geodetic methods
 HV4077.and adjusted by the National Geodetic Survey in November 1994.
 HV4077
 HV4077.The orthometric height was scaled from a topographic map.
 HV4077
 HV4077.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4077.GEOID18 height accuracy estimate available here.
 HV4077
 HV4077.Click photographs - Photos may exist for this station.
 HV4077
 HV4077.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4077
 HV4077. The following values were computed from the NAD 83(1993) position.
 HV4077
 HV4077;                    North         East     Units Scale Factor Converg.
 HV4077;SPC MD       -   139,148.326   393,812.783   MT  0.99995015   -0 02 41.2
 HV4077;SPC MD       -   456,522.47  1,292,034.11   sFT  0.99995015   -0 02 41.2
 HV4077;SPC VA N     - 2,140,104.795 3,623,888.269   MT  0.99996230   +0 53 29.9
 HV4077;SPC VA N     - 7,021,327.15 11,889,373.43   sFT  0.99996230   +0 53 29.9
 HV4077;UTM  18      - 4,309,959.094   320,428.711   MT  0.99999708   -1 18 05.9
 HV4077
 HV4077!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4077!SPC MD       -   0.99999250  x   0.99995015  =   0.99994265
 HV4077!SPC VA N     -   0.99999250  x   0.99996230  =   0.99995480
 HV4077!UTM  18      -   0.99999250  x   0.99999708  =   0.99998958
 HV4077
 HV4077_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2042809959(NAD 83)
 HV4077
 HV4077|---------------------------------------------------------------------|
 HV4077| PID    Reference Object                     Distance      Geod. Az  |
 HV4077|                                                           dddmmss.s |
 HV4077| HV2166 NW 112 DCDHT                        288.845 METERS 14610     |
 HV4077| HV4189 N W 112 B 1960                      343.485 METERS 33445     |
 HV4077|---------------------------------------------------------------------|
 HV4077
 HV4077                          SUPERSEDED SURVEY CONTROL
 HV4077
 HV4077  NAD 83(1991)-  38 55 12.66182(N)    077 04 16.85280(W) AD(       ) 2
 HV4077  NAD 83(1986)-  38 55 12.66183(N)    077 04 16.86201(W) AD(       ) 2
 HV4077  NAD 27      -  38 55 12.25950(N)    077 04 17.93680(W) AD(       ) 2
 HV4077
 HV4077.Superseded values are not recommended for survey control.
 HV4077
 HV4077.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4077.See file dsdata.pdf to determine how the superseded data were derived.
 HV4077
 HV4077_MARKER: Z = SEE DESCRIPTION
 HV4077_SETTING: 0 = UNSPECIFIED SETTING
 HV4077_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4077
 HV4077  HISTORY     - Date     Condition        Report By
 HV4077  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4077  HISTORY     - 1971     GOOD             NGS
 HV4077
 HV4077                          STATION DESCRIPTION
 HV4077
 HV4077'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4077'STATION RECOVERED EMBEDDED IN SIDEWALK AND APPEARS TO HAVE BEEN
 HV4077'LEADED AROUND.  THE MARK IS PLAINLY VISIBLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4189 ***********************************************************************
 HV4189  DESIGNATION -  N W 112 B 1960
 HV4189  PID         -  HV4189
 HV4189  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4189  COUNTRY     -  US
 HV4189  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4189
 HV4189                         *CURRENT SURVEY CONTROL
 HV4189  ______________________________________________________________________
 HV4189* NAD 83(1993) POSITION- 38 55 22.73737(N) 077 04 22.93381(W)   ADJUSTED
 HV4189* NAVD 88 ORTHO HEIGHT -    94.    (meters)      308.    (feet) SCALED
 HV4189  ______________________________________________________________________
 HV4189  GEOID HEIGHT    -        -31.977 (meters)                     GEOID18
 HV4189  LAPLACE CORR    -         -2.85  (seconds)                    DEFLEC18
 HV4189  HORZ ORDER      -  SECOND
 HV4189
 HV4189.The horizontal coordinates were established by classical geodetic methods
 HV4189.and adjusted by the National Geodetic Survey in November 1994.
 HV4189
 HV4189.The orthometric height was scaled from a topographic map.
 HV4189
 HV4189.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4189.GEOID18 height accuracy estimate available here.
 HV4189
 HV4189.Click photographs - Photos may exist for this station.
 HV4189
 HV4189.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4189
 HV4189. The following values were computed from the NAD 83(1993) position.
 HV4189
 HV4189;                    North         East     Units Scale Factor Converg.
 HV4189;SPC MD       -   139,459.093   393,666.516   MT  0.99995019   -0 02 45.0
 HV4189;SPC MD       -   457,542.04  1,291,554.23   sFT  0.99995019   -0 02 45.0
 HV4189;SPC VA N     - 2,140,413.134 3,623,736.940   MT  0.99996256   +0 53 26.1
 HV4189;SPC VA N     - 7,022,338.76 11,888,876.94   sFT  0.99996256   +0 53 26.1
 HV4189;UTM  18      - 4,310,273.009   320,289.289   MT  0.99999770   -1 18 10.0
 HV4189
 HV4189!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4189!SPC MD       -   0.99999030  x   0.99995019  =   0.99994050
 HV4189!SPC VA N     -   0.99999030  x   0.99996256  =   0.99995286
 HV4189!UTM  18      -   0.99999030  x   0.99999770  =   0.99998800
 HV4189
 HV4189_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2028910273(NAD 83)
 HV4189
 HV4189|---------------------------------------------------------------------|
 HV4189| PID    Reference Object                     Distance      Geod. Az  |
 HV4189|                                                           dddmmss.s |
 HV4189| HV4077 N W 112 A 1960                      343.485 METERS 15445     |
 HV4189| HV4198 N W 112 C 1960                      280.429 METERS 35935     |
 HV4189|---------------------------------------------------------------------|
 HV4189
 HV4189                          SUPERSEDED SURVEY CONTROL
 HV4189
 HV4189  NAD 83(1991)-  38 55 22.73626(N)    077 04 22.93514(W) AD(       ) 2
 HV4189  NAD 83(1986)-  38 55 22.73637(N)    077 04 22.94428(W) AD(       ) 2
 HV4189  NAD 27      -  38 55 22.33450(N)    077 04 24.01880(W) AD(       ) 2
 HV4189
 HV4189.Superseded values are not recommended for survey control.
 HV4189
 HV4189.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4189.See file dsdata.pdf to determine how the superseded data were derived.
 HV4189
 HV4189_MARKER: Z = SEE DESCRIPTION
 HV4189_SETTING: 0 = UNSPECIFIED SETTING
 HV4189_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4189
 HV4189  HISTORY     - Date     Condition        Report By
 HV4189  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4189  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4189
 HV4189                          STATION DESCRIPTION
 HV4189
 HV4189'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4189'THIS STATION HAS BEEN DESTROYED.  THE REFERENCE POINTS GIVEN WERE
 HV4189'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4198 ***********************************************************************
 HV4198  DESIGNATION -  N W 112 C 1960
 HV4198  PID         -  HV4198
 HV4198  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4198  COUNTRY     -  US
 HV4198  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4198
 HV4198                         *CURRENT SURVEY CONTROL
 HV4198  ______________________________________________________________________
 HV4198* NAD 83(1993) POSITION- 38 55 31.83098(N) 077 04 23.02006(W)   ADJUSTED
 HV4198* NAVD 88 ORTHO HEIGHT -   107.    (meters)      351.    (feet) SCALED
 HV4198  ______________________________________________________________________
 HV4198  GEOID HEIGHT    -        -31.973 (meters)                     GEOID18
 HV4198  LAPLACE CORR    -         -2.89  (seconds)                    DEFLEC18
 HV4198  HORZ ORDER      -  SECOND
 HV4198
 HV4198.The horizontal coordinates were established by classical geodetic methods
 HV4198.and adjusted by the National Geodetic Survey in November 1994.
 HV4198
 HV4198.The orthometric height was scaled from a topographic map.
 HV4198
 HV4198.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4198.GEOID18 height accuracy estimate available here.
 HV4198
 HV4198.Click photographs - Photos may exist for this station.
 HV4198
 HV4198.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4198
 HV4198. The following values were computed from the NAD 83(1993) position.
 HV4198
 HV4198;                    North         East     Units Scale Factor Converg.
 HV4198;SPC MD       -   139,739.503   393,664.662   MT  0.99995022   -0 02 45.1
 HV4198;SPC MD       -   458,462.02  1,291,548.15   sFT  0.99995022   -0 02 45.1
 HV4198;SPC VA N     - 2,140,693.479 3,623,730.504   MT  0.99996280   +0 53 26.1
 HV4198;SPC VA N     - 7,023,258.52 11,888,855.83   sFT  0.99996280   +0 53 26.1
 HV4198;UTM  18      - 4,310,553.405   320,293.587   MT  0.99999768   -1 18 10.3
 HV4198
 HV4198!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4198!SPC MD       -   0.99998826  x   0.99995022  =   0.99993848
 HV4198!SPC VA N     -   0.99998826  x   0.99996280  =   0.99995106
 HV4198!UTM  18      -   0.99998826  x   0.99999768  =   0.99998594
 HV4198
 HV4198_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2029310553(NAD 83)
 HV4198
 HV4198                          SUPERSEDED SURVEY CONTROL
 HV4198
 HV4198  NAD 83(1991)-  38 55 31.82989(N)    077 04 23.02137(W) AD(       ) 2
 HV4198  NAD 83(1986)-  38 55 31.83018(N)    077 04 23.03042(W) AD(       ) 2
 HV4198  NAD 27      -  38 55 31.42840(N)    077 04 24.10470(W) AD(       ) 2
 HV4198
 HV4198.Superseded values are not recommended for survey control.
 HV4198
 HV4198.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4198.See file dsdata.pdf to determine how the superseded data were derived.
 HV4198
 HV4198_MARKER: DS = TRIANGULATION STATION DISK
 HV4198_SETTING: 0 = UNSPECIFIED SETTING
 HV4198_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4198
 HV4198  HISTORY     - Date     Condition        Report By
 HV4198  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4198  HISTORY     - 1971     GOOD             NGS
 HV4198
 HV4198                          STATION DESCRIPTION
 HV4198
 HV4198'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4198'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4198'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. N.W. 112-C
 HV4198'GROUTED IN CONCRETE WALK.
 HV4198
 HV4198                          STATION RECOVERY (1971)
 HV4198
 HV4198'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4198'THE STATION WAS RECOVERED IN GOOD CONDITION AND ALL REFERENCE
 HV4198'POINTS GIVEN WERE RECOVERED AS SHOWN ON SKETCH.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4201 ***********************************************************************
 HV4201  DESIGNATION -  N W 113 A 1960
 HV4201  PID         -  HV4201
 HV4201  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4201  COUNTRY     -  US
 HV4201  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4201
 HV4201                         *CURRENT SURVEY CONTROL
 HV4201  ______________________________________________________________________
 HV4201* NAD 83(1993) POSITION- 38 55 47.31789(N) 077 04 30.00062(W)   ADJUSTED
 HV4201* NAVD 88 ORTHO HEIGHT -   111.    (meters)      364.    (feet) SCALED
 HV4201  ______________________________________________________________________
 HV4201  GEOID HEIGHT    -        -31.964 (meters)                     GEOID18
 HV4201  LAPLACE CORR    -         -2.88  (seconds)                    DEFLEC18
 HV4201  HORZ ORDER      -  SECOND
 HV4201
 HV4201.The horizontal coordinates were established by classical geodetic methods
 HV4201.and adjusted by the National Geodetic Survey in November 1994.
 HV4201
 HV4201.The orthometric height was scaled from a topographic map.
 HV4201
 HV4201.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4201.GEOID18 height accuracy estimate available here.
 HV4201
 HV4201.Click photographs - Photos may exist for this station.
 HV4201
 HV4201.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4201
 HV4201. The following values were computed from the NAD 83(1993) position.
 HV4201
 HV4201;                    North         East     Units Scale Factor Converg.
 HV4201;SPC MD       -   140,217.189   393,496.915   MT  0.99995029   -0 02 49.5
 HV4201;SPC MD       -   460,029.23  1,290,997.80   sFT  0.99995029   -0 02 49.5
 HV4201;SPC VA N     - 2,141,168.366 3,623,554.970   MT  0.99996320   +0 53 21.7
 HV4201;SPC VA N     - 7,024,816.55 11,888,279.93   sFT  0.99996320   +0 53 21.7
 HV4201;UTM  18      - 4,311,034.680   320,136.352   MT  0.99999837   -1 18 15.2
 HV4201
 HV4201!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4201!SPC MD       -   0.99998763  x   0.99995029  =   0.99993793
 HV4201!SPC VA N     -   0.99998763  x   0.99996320  =   0.99995084
 HV4201!UTM  18      -   0.99998763  x   0.99999837  =   0.99998600
 HV4201
 HV4201_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2013611034(NAD 83)
 HV4201
 HV4201                          SUPERSEDED SURVEY CONTROL
 HV4201
 HV4201  NAD 83(1991)-  38 55 47.31685(N)    077 04 30.00188(W) AD(       ) 2
 HV4201  NAD 83(1986)-  38 55 47.31731(N)    077 04 30.01081(W) AD(       ) 2
 HV4201  NAD 27      -  38 55 46.91610(N)    077 04 31.08520(W) AD(       ) 2
 HV4201
 HV4201.Superseded values are not recommended for survey control.
 HV4201
 HV4201.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4201.See file dsdata.pdf to determine how the superseded data were derived.
 HV4201
 HV4201_MARKER: Z = SEE DESCRIPTION
 HV4201_SETTING: 0 = UNSPECIFIED SETTING
 HV4201_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4201
 HV4201  HISTORY     - Date     Condition        Report By
 HV4201  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4201  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4201
 HV4201                          STATION DESCRIPTION
 HV4201
 HV4201'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4201'STATION WAS NOT FOUND, AND IS BELIEVED TO HAVE BEEN DESTROYED, OR
 HV4201'COVERED, BY NEW CONCRETE SIDEWALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4174 ***********************************************************************
 HV4174  DESIGNATION -  N W 113 B 1960
 HV4174  PID         -  HV4174
 HV4174  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4174  COUNTRY     -  US
 HV4174  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4174
 HV4174                         *CURRENT SURVEY CONTROL
 HV4174  ______________________________________________________________________
 HV4174* NAD 83(1993) POSITION- 38 56 01.05112(N) 077 04 48.71329(W)   ADJUSTED
 HV4174* NAVD 88 ORTHO HEIGHT -    94.    (meters)      308.    (feet) SCALED
 HV4174  ______________________________________________________________________
 HV4174  GEOID HEIGHT    -        -31.952 (meters)                     GEOID18
 HV4174  LAPLACE CORR    -         -2.64  (seconds)                    DEFLEC18
 HV4174  HORZ ORDER      -  SECOND
 HV4174
 HV4174.The horizontal coordinates were established by classical geodetic methods
 HV4174.and adjusted by the National Geodetic Survey in November 1994.
 HV4174
 HV4174.The orthometric height was scaled from a topographic map.
 HV4174
 HV4174.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4174.GEOID18 height accuracy estimate available here.
 HV4174
 HV4174.Click photographs - Photos may exist for this station.
 HV4174
 HV4174.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4174
 HV4174. The following values were computed from the NAD 83(1993) position.
 HV4174
 HV4174;                    North         East     Units Scale Factor Converg.
 HV4174;SPC MD       -   140,641.046   393,046.584   MT  0.99995036   -0 03 01.2
 HV4174;SPC MD       -   461,419.83  1,289,520.33   sFT  0.99995036   -0 03 01.2
 HV4174;SPC VA N     - 2,141,584.812 3,623,097.766   MT  0.99996357   +0 53 10.0
 HV4174;SPC VA N     - 7,026,182.84 11,886,779.92   sFT  0.99996357   +0 53 10.0
 HV4174;UTM  18      - 4,311,468.336   319,695.408   MT  1.00000033   -1 18 27.3
 HV4174
 HV4174!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4174!SPC MD       -   0.99999030  x   0.99995036  =   0.99994066
 HV4174!SPC VA N     -   0.99999030  x   0.99996357  =   0.99995387
 HV4174!UTM  18      -   0.99999030  x   1.00000033  =   0.99999063
 HV4174
 HV4174:                Primary Azimuth Mark                     Grid Az
 HV4174:SPC MD       -  N W 113 A 1960                           133 15 55.4
 HV4174:SPC VA N     -  N W 113 A 1960                           132 19 44.2
 HV4174:UTM  18      -  N W 113 A 1960                           134 31 21.5
 HV4174
 HV4174_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1969511468(NAD 83)
 HV4174
 HV4174|---------------------------------------------------------------------|
 HV4174| PID    Reference Object                     Distance      Geod. Az  |
 HV4174|                                                           dddmmss.s |
 HV4174| HV4201 N W 113 A 1960                      APPROX. 0.6 KM 1331254.2 |
 HV4174|---------------------------------------------------------------------|
 HV4174
 HV4174                          SUPERSEDED SURVEY CONTROL
 HV4174
 HV4174  NAD 83(1991)-  38 56 01.05011(N)    077 04 48.71453(W) AD(       ) 2
 HV4174  NAD 83(1986)-  38 56 01.05056(N)    077 04 48.72339(W) AD(       ) 2
 HV4174  NAD 27      -  38 56 00.64990(N)    077 04 49.79730(W) AD(       ) 2
 HV4174
 HV4174.Superseded values are not recommended for survey control.
 HV4174
 HV4174.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4174.See file dsdata.pdf to determine how the superseded data were derived.
 HV4174
 HV4174_MARKER: Z = SEE DESCRIPTION
 HV4174_SETTING: 0 = UNSPECIFIED SETTING
 HV4174_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4174
 HV4174  HISTORY     - Date     Condition        Report By
 HV4174  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4174  HISTORY     - 1971     GOOD             NGS
 HV4174
 HV4174                          STATION DESCRIPTION
 HV4174
 HV4174'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4174'STATION WAS RECOVERED IN GOOD CONDITION.  NAIL AND WASHER IN OAK
 HV4174'TREE IS GONE.  ADDITIONAL INFORMATION TO AID IN FUTURE RECOVERY
 HV4174'IS AS FOLLOWS--STATION IS 12.9 FEET WEST OF CURB OF MASSACHUSETTS
 HV4174'AVE., 9.35 FEET EAST OF BASE OF THE GUARD-RAIL POST WITH RAMSET
 HV4174'NAIL, 77.2 FEET NORTH OF STREET SIGNPOST BEARING SIGN MASS. AVE -
 HV4174'MACOMB ST. AND 4 INCHES BELOW GROUND SURFACE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4168 ***********************************************************************
 HV4168  DESIGNATION -  N W 114 A 1960
 HV4168  PID         -  HV4168
 HV4168  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4168  COUNTRY     -  US
 HV4168  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4168
 HV4168                         *CURRENT SURVEY CONTROL
 HV4168  ______________________________________________________________________
 HV4168* NAD 83(1993) POSITION- 38 56 34.71203(N) 077 04 53.99811(W)   ADJUSTED
 HV4168* NAVD 88 ORTHO HEIGHT -   120.    (meters)      394.    (feet) SCALED
 HV4168  ______________________________________________________________________
 HV4168  GEOID HEIGHT    -        -31.939 (meters)                     GEOID18
 HV4168  LAPLACE CORR    -         -2.56  (seconds)                    DEFLEC18
 HV4168  HORZ ORDER      -  SECOND
 HV4168
 HV4168.The horizontal coordinates were established by classical geodetic methods
 HV4168.and adjusted by the National Geodetic Survey in November 1994.
 HV4168
 HV4168.The orthometric height was scaled from a topographic map.
 HV4168
 HV4168.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4168.GEOID18 height accuracy estimate available here.
 HV4168
 HV4168.Click photographs - Photos may exist for this station.
 HV4168
 HV4168.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4168
 HV4168. The following values were computed from the NAD 83(1993) position.
 HV4168
 HV4168;                    North         East     Units Scale Factor Converg.
 HV4168;SPC MD       -   141,679.119   392,920.232   MT  0.99995053   -0 03 04.5
 HV4168;SPC MD       -   464,825.58  1,289,105.79   sFT  0.99995053   -0 03 04.5
 HV4168;SPC VA N     - 2,142,620.695 3,622,954.463   MT  0.99996448   +0 53 06.7
 HV4168;SPC VA N     - 7,029,581.40 11,886,309.77   sFT  0.99996448   +0 53 06.7
 HV4168;UTM  18      - 4,312,508.984   319,591.860   MT  1.00000079   -1 18 31.6
 HV4168
 HV4168!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4168!SPC MD       -   0.99998622  x   0.99995053  =   0.99993675
 HV4168!SPC VA N     -   0.99998622  x   0.99996448  =   0.99995070
 HV4168!UTM  18      -   0.99998622  x   1.00000079  =   0.99998701
 HV4168
 HV4168:                Primary Azimuth Mark                     Grid Az
 HV4168:SPC MD       -  NW 114 DCDHT                             212 44 56.4
 HV4168:SPC VA N     -  NW 114 DCDHT                             211 48 45.2
 HV4168:UTM  18      -  NW 114 DCDHT                             214 00 23.5
 HV4168
 HV4168_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1959112508(NAD 83)
 HV4168
 HV4168|---------------------------------------------------------------------|
 HV4168| PID    Reference Object                     Distance      Geod. Az  |
 HV4168|                                                           dddmmss.s |
 HV4168| HV2149 NW 115                              468.503 METERS 0342754.7 |
 HV4168| HV2150 NW 114 DCDHT                        APPROX. 0.7 KM 2124151.9 |
 HV4168|---------------------------------------------------------------------|
 HV4168
 HV4168                          SUPERSEDED SURVEY CONTROL
 HV4168
 HV4168  NAD 83(1991)-  38 56 34.71111(N)    077 04 53.99923(W) AD(       ) 2
 HV4168  NAD 83(1986)-  38 56 34.71121(N)    077 04 54.00836(W) AD(       ) 2
 HV4168  NAD 27      -  38 56 34.31160(N)    077 04 55.08130(W) AD(       ) 2
 HV4168
 HV4168.Superseded values are not recommended for survey control.
 HV4168
 HV4168.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4168.See file dsdata.pdf to determine how the superseded data were derived.
 HV4168
 HV4168_MARKER: N = NAIL
 HV4168_SETTING: 0 = UNSPECIFIED SETTING
 HV4168_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4168
 HV4168  HISTORY     - Date     Condition        Report By
 HV4168  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4168  HISTORY     - 1971     GOOD             NGS
 HV4168  HISTORY     - 20101030 MARK NOT FOUND   GEOCAC
 HV4168
 HV4168                          STATION DESCRIPTION
 HV4168
 HV4168'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4168'STATION WAS RECOVERED IN GOOD CONDITION, HOWEVER THE NAILS AND
 HV4168'WASHERS IN THE 3 TREES ARE GONE.
 HV4168'
 HV4168'ADDITIONAL INFORMATION TO AID IN FUTURE RECOVERY IS AS
 HV4168'FOLLOWS--STATION IS 45.8 FEET SOUTHWEST OF CENTER OF STREET SIGNAL
 HV4168'POST, 34.3 FEET SOUTHWEST OF CENTER OF TREE TO NORTHEAST, 19.5
 HV4168'FEET NORTHEAST OF CENTER OF TREE TO SOUTHWEST, AND THE 1/4-INCH
 HV4168'NAIL HEAD PROJECTS 3/16-INCH FROM CONCRETE CURB.
 HV4168
 HV4168                          STATION RECOVERY (2010)
 HV4168
 HV4168'RECOVERY NOTE BY GEOCACHING 2010 (RLM)
 HV4168'THE CURB HAS BEEN REPLACED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4202 ***********************************************************************
 HV4202  DESIGNATION -  N W 115 A
 HV4202  PID         -  HV4202
 HV4202  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4202  COUNTRY     -  US
 HV4202  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4202
 HV4202                         *CURRENT SURVEY CONTROL
 HV4202  ______________________________________________________________________
 HV4202* NAD 83(1993) POSITION- 38 57 04.59881(N) 077 04 28.44459(W)   ADJUSTED
 HV4202* NAVD 88 ORTHO HEIGHT -   111.    (meters)      364.    (feet) SCALED
 HV4202  ______________________________________________________________________
 HV4202  GEOID HEIGHT    -        -31.940 (meters)                     GEOID18
 HV4202  LAPLACE CORR    -         -2.82  (seconds)                    DEFLEC18
 HV4202  HORZ ORDER      -  SECOND
 HV4202
 HV4202.The horizontal coordinates were established by classical geodetic methods
 HV4202.and adjusted by the National Geodetic Survey in November 1994.
 HV4202
 HV4202.The orthometric height was scaled from a topographic map.
 HV4202
 HV4202.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4202.GEOID18 height accuracy estimate available here.
 HV4202
 HV4202.Click photographs - Photos may exist for this station.
 HV4202
 HV4202.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4202
 HV4202. The following values were computed from the NAD 83(1993) position.
 HV4202
 HV4202;                    North         East     Units Scale Factor Converg.
 HV4202;SPC MD       -   142,600.176   393,536.339   MT  0.99995071   -0 02 48.5
 HV4202;SPC MD       -   467,847.41  1,291,127.14   sFT  0.99995071   -0 02 48.5
 HV4202;SPC VA N     - 2,143,551.711 3,623,555.443   MT  0.99996531   +0 53 22.7
 HV4202;SPC VA N     - 7,032,635.91 11,888,281.48   sFT  0.99996531   +0 53 22.7
 HV4202;UTM  18      - 4,313,416.341   320,228.065   MT  0.99999796   -1 18 16.4
 HV4202
 HV4202!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4202!SPC MD       -   0.99998763  x   0.99995071  =   0.99993834
 HV4202!SPC VA N     -   0.99998763  x   0.99996531  =   0.99995294
 HV4202!UTM  18      -   0.99998763  x   0.99999796  =   0.99998559
 HV4202
 HV4202:                Primary Azimuth Mark                     Grid Az
 HV4202:SPC MD       -  NW 115                                   213 14 20.7
 HV4202:SPC VA N     -  NW 115                                   212 18 09.5
 HV4202:UTM  18      -  NW 115                                   214 29 48.6
 HV4202
 HV4202_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2022813416(NAD 83)
 HV4202
 HV4202|---------------------------------------------------------------------|
 HV4202| PID    Reference Object                     Distance      Geod. Az  |
 HV4202|                                                           dddmmss.s |
 HV4202| HV2149 NW 115                              APPROX. 0.6 KM 2131132.2 |
 HV4202| HV4384 RENO RESET                          317.482 METERS 29755     |
 HV4202|---------------------------------------------------------------------|
 HV4202
 HV4202                          SUPERSEDED SURVEY CONTROL
 HV4202
 HV4202  NAD 83(1991)-  38 57 04.59799(N)    077 04 28.44554(W) AD(       ) 2
 HV4202  NAD 83(1986)-  38 57 04.59746(N)    077 04 28.45524(W) AD(       ) 2
 HV4202  NAD 27      -  38 57 04.19920(N)    077 04 29.52900(W) AD(       ) 2
 HV4202
 HV4202.Superseded values are not recommended for survey control.
 HV4202
 HV4202.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4202.See file dsdata.pdf to determine how the superseded data were derived.
 HV4202
 HV4202_MARKER: DD = SURVEY DISK
 HV4202_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV4202_SP_SET: CURB
 HV4202_STAMPING: U.S.C.G.S NO. NW 115 A
 HV4202_MARK LOGO: DCDHT
 HV4202_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4202
 HV4202  HISTORY     - Date     Condition        Report By
 HV4202  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4202  HISTORY     - 1971     GOOD             NGS
 HV4202  HISTORY     - 20101030 GOOD             GEOCAC
 HV4202
 HV4202                          STATION DESCRIPTION
 HV4202
 HV4202'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4202'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4202'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. N.W. 115-A
 HV4202'GROUTED IN CONCRETE CURB.
 HV4202
 HV4202                          STATION RECOVERY (1971)
 HV4202
 HV4202'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4202'THE STATION WAS RECOVERED IN GOOD CONDITION.
 HV4202
 HV4202                          STATION RECOVERY (2010)
 HV4202
 HV4202'RECOVERY NOTE BY GEOCACHING 2010 (RLM)
 HV4202'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4247 ***********************************************************************
 HV4247  DESIGNATION -  N W 116 A 1960
 HV4247  PID         -  HV4247
 HV4247  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4247  COUNTRY     -  US
 HV4247  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4247
 HV4247                         *CURRENT SURVEY CONTROL
 HV4247  ______________________________________________________________________
 HV4247* NAD 83(1993) POSITION- 38 56 41.65633(N) 077 03 49.55066(W)   ADJUSTED
 HV4247* NAVD 88 ORTHO HEIGHT -    76.    (meters)      249.    (feet) SCALED
 HV4247  ______________________________________________________________________
 HV4247  GEOID HEIGHT    -        -31.964 (meters)                     GEOID18
 HV4247  LAPLACE CORR    -         -3.07  (seconds)                    DEFLEC18
 HV4247  HORZ ORDER      -  SECOND
 HV4247
 HV4247.The horizontal coordinates were established by classical geodetic methods
 HV4247.and adjusted by the National Geodetic Survey in November 1994.
 HV4247
 HV4247.The orthometric height was scaled from a topographic map.
 HV4247
 HV4247.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4247.GEOID18 height accuracy estimate available here.
 HV4247
 HV4247.Click photographs - Photos may exist for this station.
 HV4247
 HV4247.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4247
 HV4247. The following values were computed from the NAD 83(1993) position.
 HV4247
 HV4247;                    North         East     Units Scale Factor Converg.
 HV4247;SPC MD       -   141,892.016   394,472.340   MT  0.99995057   -0 02 24.1
 HV4247;SPC MD       -   465,524.06  1,294,198.00   sFT  0.99995057   -0 02 24.1
 HV4247;SPC VA N     - 2,142,858.933 3,624,502.906   MT  0.99996467   +0 53 47.0
 HV4247;SPC VA N     - 7,030,363.02 11,891,389.95   sFT  0.99996467   +0 53 47.0
 HV4247;UTM  18      - 4,312,687.775   321,148.340   MT  0.99999390   -1 17 51.3
 HV4247
 HV4247!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4247!SPC MD       -   0.99999313  x   0.99995057  =   0.99994370
 HV4247!SPC VA N     -   0.99999313  x   0.99996467  =   0.99995780
 HV4247!UTM  18      -   0.99999313  x   0.99999390  =   0.99998703
 HV4247
 HV4247_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2114812687(NAD 83)
 HV4247
 HV4247                          SUPERSEDED SURVEY CONTROL
 HV4247
 HV4247  NAD 83(1991)-  38 56 41.65556(N)    077 03 49.55185(W) AD(       ) 2
 HV4247  NAD 83(1986)-  38 56 41.65519(N)    077 03 49.56197(W) AD(       ) 2
 HV4247  NAD 27      -  38 56 41.25690(N)    077 03 50.63800(W) AD(       ) 2
 HV4247
 HV4247.Superseded values are not recommended for survey control.
 HV4247
 HV4247.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4247.See file dsdata.pdf to determine how the superseded data were derived.
 HV4247
 HV4247_MARKER: Z = SEE DESCRIPTION
 HV4247_SETTING: 0 = UNSPECIFIED SETTING
 HV4247_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4247
 HV4247  HISTORY     - Date     Condition        Report By
 HV4247  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4247  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4247
 HV4247                          STATION DESCRIPTION
 HV4247
 HV4247'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4247'THIS STATION WAS DESTROYED WHEN SIDEWALK WAS REPLACED.  THE SAFEWAY
 HV4247'STORE HAS BEEN REPLACED BY A NEW BUILDING.  THE REFERENCE POINT
 HV4247'ON RIM OF MANHOLE REMAINS AND WAS RECOVERED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4261 ***********************************************************************
 HV4261  DESIGNATION -  N W 116 B 1960
 HV4261  PID         -  HV4261
 HV4261  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4261  COUNTRY     -  US
 HV4261  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4261
 HV4261                         *CURRENT SURVEY CONTROL
 HV4261  ______________________________________________________________________
 HV4261* NAD 83(1993) POSITION- 38 56 33.72748(N) 077 03 45.01721(W)   ADJUSTED
 HV4261* NAVD 88 ORTHO HEIGHT -    82.    (meters)      269.    (feet) SCALED
 HV4261  ______________________________________________________________________
 HV4261  GEOID HEIGHT    -        -31.968 (meters)                     GEOID18
 HV4261  LAPLACE CORR    -         -3.07  (seconds)                    DEFLEC18
 HV4261  HORZ ORDER      -  SECOND
 HV4261
 HV4261.The horizontal coordinates were established by classical geodetic methods
 HV4261.and adjusted by the National Geodetic Survey in November 1994.
 HV4261
 HV4261.The orthometric height was scaled from a topographic map.
 HV4261
 HV4261.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4261.GEOID18 height accuracy estimate available here.
 HV4261
 HV4261.Click photographs - Photos may exist for this station.
 HV4261
 HV4261.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4261
 HV4261. The following values were computed from the NAD 83(1993) position.
 HV4261
 HV4261;                    North         East     Units Scale Factor Converg.
 HV4261;SPC MD       -   141,647.448   394,581.340   MT  0.99995053   -0 02 21.2
 HV4261;SPC MD       -   464,721.67  1,294,555.61   sFT  0.99995053   -0 02 21.2
 HV4261;SPC VA N     - 2,142,616.176 3,624,615.890   MT  0.99996445   +0 53 49.8
 HV4261;SPC VA N     - 7,029,566.57 11,891,760.63   sFT  0.99996445   +0 53 49.8
 HV4261;UTM  18      - 4,312,440.863   321,251.950   MT  0.99999344   -1 17 48.2
 HV4261
 HV4261!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4261!SPC MD       -   0.99999219  x   0.99995053  =   0.99994272
 HV4261!SPC VA N     -   0.99999219  x   0.99996445  =   0.99995664
 HV4261!UTM  18      -   0.99999219  x   0.99999344  =   0.99998563
 HV4261
 HV4261:                Primary Azimuth Mark                     Grid Az
 HV4261:SPC MD       -  NW 117                                   155 39 18.9
 HV4261:SPC VA N     -  NW 117                                   154 43 07.9
 HV4261:UTM  18      -  NW 117                                   156 54 45.9
 HV4261
 HV4261_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2125112440(NAD 83)
 HV4261
 HV4261|---------------------------------------------------------------------|
 HV4261| PID    Reference Object                     Distance      Geod. Az  |
 HV4261|                                                           dddmmss.s |
 HV4261| HV2144 NW 117                              APPROX. 0.7 KM 1553657.7 |
 HV4261| HV4247 N W 116 A 1960                      267.771 METERS 33556     |
 HV4261|---------------------------------------------------------------------|
 HV4261
 HV4261                          SUPERSEDED SURVEY CONTROL
 HV4261
 HV4261  NAD 83(1991)-  38 56 33.72669(N)    077 03 45.01840(W) AD(       ) 2
 HV4261  NAD 83(1986)-  38 56 33.72632(N)    077 03 45.02855(W) AD(       ) 2
 HV4261  NAD 27      -  38 56 33.32750(N)    077 03 46.10480(W) AD(       ) 2
 HV4261
 HV4261.Superseded values are not recommended for survey control.
 HV4261
 HV4261.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4261.See file dsdata.pdf to determine how the superseded data were derived.
 HV4261
 HV4261_MARKER: DS = TRIANGULATION STATION DISK
 HV4261_SETTING: 0 = UNSPECIFIED SETTING
 HV4261_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4261_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4261+SATELLITE: SATELLITE OBSERVATIONS - March 15, 2012
 HV4261
 HV4261  HISTORY     - Date     Condition        Report By
 HV4261  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4261  HISTORY     - 1966     GOOD             LOCENG
 HV4261  HISTORY     - 1971     GOOD             NGS
 HV4261  HISTORY     - 20120315 GOOD             GEOCAC
 HV4261
 HV4261                          STATION DESCRIPTION
 HV4261
 HV4261'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4261'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4261'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. N.W. 116-B
 HV4261'GROUTED IN CONCRETE WALK.
 HV4261
 HV4261                          STATION RECOVERY (1966)
 HV4261
 HV4261'RECOVERY NOTE BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (CJM)
 HV4261'RECOVERED BY DE LEUW CATHER CO.
 HV4261'
 HV4261'NW 116-B GOOD
 HV4261
 HV4261                          STATION RECOVERY (1971)
 HV4261
 HV4261'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4261'STATION RECOVERED AS DESCRIBED IN GOOD CONDITION.
 HV4261
 HV4261                          STATION RECOVERY (2012)
 HV4261
 HV4261'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV4261'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4335 ***********************************************************************
 HV4335  DESIGNATION -  N W 117 B 1960
 HV4335  PID         -  HV4335
 HV4335  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4335  COUNTRY     -  US
 HV4335  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4335
 HV4335                         *CURRENT SURVEY CONTROL
 HV4335  ______________________________________________________________________
 HV4335* NAD 83(1993) POSITION- 38 55 48.30635(N) 077 03 18.58650(W)   ADJUSTED
 HV4335* NAVD 88 ORTHO HEIGHT -    69.    (meters)      226.    (feet) SCALED
 HV4335  ______________________________________________________________________
 HV4335  GEOID HEIGHT    -        -31.995 (meters)                     GEOID18
 HV4335  LAPLACE CORR    -         -2.73  (seconds)                    DEFLEC18
 HV4335  HORZ ORDER      -  SECOND
 HV4335
 HV4335.The horizontal coordinates were established by classical geodetic methods
 HV4335.and adjusted by the National Geodetic Survey in November 1994.
 HV4335
 HV4335.The orthometric height was scaled from a topographic map.
 HV4335
 HV4335.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4335.GEOID18 height accuracy estimate available here.
 HV4335
 HV4335.Click photographs - Photos may exist for this station.
 HV4335
 HV4335.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4335
 HV4335. The following values were computed from the NAD 83(1993) position.
 HV4335
 HV4335;                    North         East     Units Scale Factor Converg.
 HV4335;SPC MD       -   140,246.443   395,216.974   MT  0.99995030   -0 02 04.6
 HV4335;SPC MD       -   460,125.21  1,296,641.02   sFT  0.99995030   -0 02 04.6
 HV4335;SPC VA N     - 2,141,225.726 3,625,274.343   MT  0.99996323   +0 54 06.3
 HV4335;SPC VA N     - 7,025,004.74 11,893,920.91   sFT  0.99996323   +0 54 06.3
 HV4335;UTM  18      - 4,311,026.189   321,856.715   MT  0.99999079   -1 17 30.3
 HV4335
 HV4335!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4335!SPC MD       -   0.99999423  x   0.99995030  =   0.99994453
 HV4335!SPC VA N     -   0.99999423  x   0.99996323  =   0.99995746
 HV4335!UTM  18      -   0.99999423  x   0.99999079  =   0.99998502
 HV4335
 HV4335:                Primary Azimuth Mark                     Grid Az
 HV4335:SPC MD       -  N W 117 A 1960                           332 35 02.0
 HV4335:SPC VA N     -  N W 117 A 1960                           331 38 51.1
 HV4335:UTM  18      -  N W 117 A 1960                           333 50 27.7
 HV4335
 HV4335_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2185611026(NAD 83)
 HV4335
 HV4335|---------------------------------------------------------------------|
 HV4335| PID    Reference Object                     Distance      Geod. Az  |
 HV4335|                                                           dddmmss.s |
 HV4335| HV2162 NW 118                              395.558 METERS 15550     |
 HV4335| HV4320 N W 117 A 1960                      441.114 METERS 3323257.4 |
 HV4335|---------------------------------------------------------------------|
 HV4335
 HV4335                          SUPERSEDED SURVEY CONTROL
 HV4335
 HV4335  NAD 83(1991)-  38 55 48.30546(N)    077 03 18.58777(W) AD(       ) 2
 HV4335  NAD 83(1986)-  38 55 48.30509(N)    077 03 18.59804(W) AD(       ) 2
 HV4335  NAD 27      -  38 55 47.90540(N)    077 03 19.67720(W) AD(       ) 2
 HV4335
 HV4335.Superseded values are not recommended for survey control.
 HV4335
 HV4335.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4335.See file dsdata.pdf to determine how the superseded data were derived.
 HV4335
 HV4335_MARKER: DS = TRIANGULATION STATION DISK
 HV4335_SETTING: 0 = UNSPECIFIED SETTING
 HV4335_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4335
 HV4335  HISTORY     - Date     Condition        Report By
 HV4335  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4335  HISTORY     - 1971     GOOD             NGS
 HV4335
 HV4335                          STATION DESCRIPTION
 HV4335
 HV4335'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4335'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4335'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. N.W. 117-B
 HV4335'GROUTED IN CONCRETE WALK.
 HV4335
 HV4335                          STATION RECOVERY (1971)
 HV4335
 HV4335'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4335'STATION WAS RECOVERED AS PREVIOUSLY DESCRIBED, EXCEPT THAT THE
 HV4335'NAIL AND WASHER IN 24-INCH MAPLE TO SOUTHEAST IS GONE.  ADDITIONAL
 HV4335'MEASUREMENTS FOLLOW--STATION IS 11.3 FEET SOUTHEAST OF A FIRE
 HV4335'HYDRANT AND 8 INCHES WEST OF EAST EDGE OF SIDEWALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4286 ***********************************************************************
 HV4286  DESIGNATION -  N W 118 A 1960
 HV4286  PID         -  HV4286
 HV4286  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4286  COUNTRY     -  US
 HV4286  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4286
 HV4286                         *CURRENT SURVEY CONTROL
 HV4286  ______________________________________________________________________
 HV4286* NAD 83(1993) POSITION- 38 55 25.39358(N) 077 03 05.34701(W)   ADJUSTED
 HV4286* NAVD 88 ORTHO HEIGHT -    47.    (meters)      154.    (feet) SCALED
 HV4286  ______________________________________________________________________
 HV4286  GEOID HEIGHT    -        -32.009 (meters)                     GEOID18
 HV4286  LAPLACE CORR    -         -2.44  (seconds)                    DEFLEC18
 HV4286  HORZ ORDER      -  SECOND
 HV4286
 HV4286.The horizontal coordinates were established by classical geodetic methods
 HV4286.and adjusted by the National Geodetic Survey in November 1994.
 HV4286
 HV4286.The orthometric height was scaled from a topographic map.
 HV4286
 HV4286.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4286.GEOID18 height accuracy estimate available here.
 HV4286
 HV4286.Click photographs - Photos may exist for this station.
 HV4286
 HV4286.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4286
 HV4286. The following values were computed from the NAD 83(1993) position.
 HV4286
 HV4286;                    North         East     Units Scale Factor Converg.
 HV4286;SPC MD       -   139,539.725   395,535.453   MT  0.99995020   -0 01 56.3
 HV4286;SPC MD       -   457,806.58  1,297,685.90   sFT  0.99995020   -0 01 56.3
 HV4286;SPC VA N     - 2,140,524.299 3,625,604.333   MT  0.99996263   +0 54 14.6
 HV4286;SPC VA N     - 7,022,703.47 11,895,003.55   sFT  0.99996263   +0 54 14.6
 HV4286;UTM  18      - 4,310,312.626   322,159.626   MT  0.99998946   -1 17 21.3
 HV4286
 HV4286!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4286!SPC MD       -   0.99999768  x   0.99995020  =   0.99994788
 HV4286!SPC VA N     -   0.99999768  x   0.99996263  =   0.99996031
 HV4286!UTM  18      -   0.99999768  x   0.99998946  =   0.99998714
 HV4286
 HV4286:                Primary Azimuth Mark                     Grid Az
 HV4286:SPC MD       -  N W 118 B 1960                           157 35 29.0
 HV4286:SPC VA N     -  N W 118 B 1960                           156 39 18.1
 HV4286:UTM  18      -  N W 118 B 1960                           158 50 54.0
 HV4286
 HV4286_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2215910312(NAD 83)
 HV4286
 HV4286|---------------------------------------------------------------------|
 HV4286| PID    Reference Object                     Distance      Geod. Az  |
 HV4286|                                                           dddmmss.s |
 HV4286| HV4214 N W 118 B 1960                      APPROX. 0.5 KM 1573332.7 |
 HV4286| HV2162 NW 118                              379.646 METERS 33535     |
 HV4286|---------------------------------------------------------------------|
 HV4286
 HV4286                          SUPERSEDED SURVEY CONTROL
 HV4286
 HV4286  NAD 83(1991)-  38 55 25.39263(N)    077 03 05.34831(W) AD(       ) 2
 HV4286  NAD 83(1986)-  38 55 25.39225(N)    077 03 05.35864(W) AD(       ) 2
 HV4286  NAD 27      -  38 55 24.99160(N)    077 03 06.43900(W) AD(       ) 2
 HV4286
 HV4286.Superseded values are not recommended for survey control.
 HV4286
 HV4286.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4286.See file dsdata.pdf to determine how the superseded data were derived.
 HV4286
 HV4286_MARKER: Z = SEE DESCRIPTION
 HV4286_SETTING: 0 = UNSPECIFIED SETTING
 HV4286_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4286
 HV4286  HISTORY     - Date     Condition        Report By
 HV4286  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4286  HISTORY     - 1966     GOOD             LOCENG
 HV4286  HISTORY     - 1971     GOOD             NGS
 HV4286
 HV4286                          STATION DESCRIPTION
 HV4286
 HV4286'DESCRIBED BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (CJM)
 HV4286'RECOVERED BY DE LEUW CATHER CO.
 HV4286'
 HV4286'NW 118 A GOOD
 HV4286
 HV4286                          STATION RECOVERY (1971)
 HV4286
 HV4286'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4286'STATION WAS RECOVERED IN GOOD CONDITION AS PREVIOUSLY
 HV4286'DESCRIBED.  ORIGINAL DESCRIPTION IS ADEQUATE, WITH THE FOLLOWING
 HV4286'ADDITIONS.  STATION IS 3.0 FEET EAST-NORTHEAST OF THE NORTHEAST
 HV4286'CORNER OF A RECTANGULAR, IRON MANHOLE COVER, AND PROJECTS
 HV4286'3/4-INCH FROM THE DIRT AT SOUTH EDGE OF CONCRETE SIDEWALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4214 ***********************************************************************
 HV4214  DESIGNATION -  N W 118 B 1960
 HV4214  PID         -  HV4214
 HV4214  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4214  COUNTRY     -  US
 HV4214  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4214
 HV4214                         *CURRENT SURVEY CONTROL
 HV4214  ______________________________________________________________________
 HV4214* NAD 83(1993) POSITION- 38 55 10.08858(N) 077 02 57.25562(W)   ADJUSTED
 HV4214* NAVD 88 ORTHO HEIGHT -    46.    (meters)      151.    (feet) SCALED
 HV4214  ______________________________________________________________________
 HV4214  GEOID HEIGHT    -        -32.017 (meters)                     GEOID18
 HV4214  LAPLACE CORR    -         -2.29  (seconds)                    DEFLEC18
 HV4214  HORZ ORDER      -  SECOND
 HV4214
 HV4214.The horizontal coordinates were established by classical geodetic methods
 HV4214.and adjusted by the National Geodetic Survey in November 1994.
 HV4214
 HV4214.The orthometric height was scaled from a topographic map.
 HV4214
 HV4214.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4214.GEOID18 height accuracy estimate available here.
 HV4214
 HV4214.Click photographs - Photos may exist for this station.
 HV4214
 HV4214.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4214
 HV4214. The following values were computed from the NAD 83(1993) position.
 HV4214
 HV4214;                    North         East     Units Scale Factor Converg.
 HV4214;SPC MD       -   139,067.677   395,730.100   MT  0.99995014   -0 01 51.3
 HV4214;SPC MD       -   456,257.87  1,298,324.50   sFT  0.99995014   -0 01 51.3
 HV4214;SPC VA N     - 2,140,055.489 3,625,806.671   MT  0.99996224   +0 54 19.6
 HV4214;SPC VA N     - 7,021,165.38 11,895,667.39   sFT  0.99996224   +0 54 19.6
 HV4214;UTM  18      - 4,309,836.404   322,343.879   MT  0.99998865   -1 17 15.8
 HV4214
 HV4214!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4214!SPC MD       -   0.99999784  x   0.99995014  =   0.99994798
 HV4214!SPC VA N     -   0.99999784  x   0.99996224  =   0.99996008
 HV4214!UTM  18      -   0.99999784  x   0.99998865  =   0.99998649
 HV4214
 HV4214:                Primary Azimuth Mark                     Grid Az
 HV4214:SPC MD       -  N W 118 A 1960                           337 35 29.1
 HV4214:SPC VA N     -  N W 118 A 1960                           336 39 18.2
 HV4214:UTM  18      -  N W 118 A 1960                           338 50 53.6
 HV4214
 HV4214_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2234309836(NAD 83)
 HV4214
 HV4214|---------------------------------------------------------------------|
 HV4214| PID    Reference Object                     Distance      Geod. Az  |
 HV4214|                                                           dddmmss.s |
 HV4214| HV2161 NW 119                              258.860 METERS 13326     |
 HV4214| HV4286 N W 118 A 1960                      APPROX. 0.5 KM 3373337.8 |
 HV4214|---------------------------------------------------------------------|
 HV4214
 HV4214                          SUPERSEDED SURVEY CONTROL
 HV4214
 HV4214  NAD 83(1991)-  38 55 10.08760(N)    077 02 57.25695(W) AD(       ) 2
 HV4214  NAD 83(1986)-  38 55 10.08722(N)    077 02 57.26732(W) AD(       ) 2
 HV4214  NAD 27      -  38 55 09.68630(N)    077 02 58.34840(W) AD(       ) 2
 HV4214
 HV4214.Superseded values are not recommended for survey control.
 HV4214
 HV4214.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4214.See file dsdata.pdf to determine how the superseded data were derived.
 HV4214
 HV4214_MARKER: N = NAIL
 HV4214_SETTING: 0 = UNSPECIFIED SETTING
 HV4214_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4214
 HV4214  HISTORY     - Date     Condition        Report By
 HV4214  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4214  HISTORY     - 1966     GOOD             LOCENG
 HV4214  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4214
 HV4214                          STATION DESCRIPTION
 HV4214
 HV4214'DESCRIBED BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (CJM)
 HV4214'RECOVERED BY DE LEUW CATHER CO.
 HV4214'
 HV4214'NW 118 B GOOD
 HV4214
 HV4214                          STATION RECOVERY (1971)
 HV4214
 HV4214'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4214'STATION WAS SEARCHED FOR BUT NOT FOUND, AND IT IS BELIEVED
 HV4214'THAT THE NAIL IS GONE.  THE 3 REFERENCE POINTS WERE RECOVERED
 HV4214'AS DESCRIBED.
 HV4214'
 HV4214'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4214'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4258 ***********************************************************************
 HV4258  DESIGNATION -  N W 119 A 1960
 HV4258  PID         -  HV4258
 HV4258  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4258  COUNTRY     -  US
 HV4258  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4258
 HV4258                         *CURRENT SURVEY CONTROL
 HV4258  ______________________________________________________________________
 HV4258* NAD 83(1993) POSITION- 38 54 34.53766(N) 077 02 36.48742(W)   ADJUSTED
 HV4258* NAVD 88 ORTHO HEIGHT -    26.    (meters)       85.    (feet) SCALED
 HV4258  ______________________________________________________________________
 HV4258  GEOID HEIGHT    -        -32.040 (meters)                     GEOID18
 HV4258  LAPLACE CORR    -         -2.11  (seconds)                    DEFLEC18
 HV4258  HORZ ORDER      -  SECOND
 HV4258
 HV4258.The horizontal coordinates were established by classical geodetic methods
 HV4258.and adjusted by the National Geodetic Survey in November 1994.
 HV4258
 HV4258.The orthometric height was scaled from a topographic map.
 HV4258
 HV4258.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4258.GEOID18 height accuracy estimate available here.
 HV4258
 HV4258.Click photographs - Photos may exist for this station.
 HV4258
 HV4258.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4258
 HV4258. The following values were computed from the NAD 83(1993) position.
 HV4258
 HV4258;                    North         East     Units Scale Factor Converg.
 HV4258;SPC MD       -   137,971.188   396,229.862   MT  0.99995002   -0 01 38.2
 HV4258;SPC MD       -   452,660.47  1,299,964.14   sFT  0.99995002   -0 01 38.2
 HV4258;SPC VA N     - 2,138,967.300 3,626,324.290   MT  0.99996135   +0 54 32.6
 HV4258;SPC VA N     - 7,017,595.22 11,897,365.61   sFT  0.99996135   +0 54 32.6
 HV4258;UTM  18      - 4,308,729.176   322,819.491   MT  0.99998658   -1 17 01.8
 HV4258
 HV4258!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4258!SPC MD       -   1.00000098  x   0.99995002  =   0.99995100
 HV4258!SPC VA N     -   1.00000098  x   0.99996135  =   0.99996233
 HV4258!UTM  18      -   1.00000098  x   0.99998658  =   0.99998756
 HV4258
 HV4258:                Primary Azimuth Mark                     Grid Az
 HV4258:SPC MD       -  CAFRITZ 1960                             339 38 40.3
 HV4258:SPC VA N     -  CAFRITZ 1960                             338 42 29.5
 HV4258:UTM  18      -  CAFRITZ 1960                             340 54 03.9
 HV4258
 HV4258_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2281908729(NAD 83)
 HV4258
 HV4258|---------------------------------------------------------------------|
 HV4258| PID    Reference Object                     Distance      Geod. Az  |
 HV4258|                                                           dddmmss.s |
 HV4258| HV4248 N W 133 G 1960                      164.533 METERS 09110     |
 HV4258| HV4240 LONGFELLOW 1960                     449.837 METERS 1462249.6 |
 HV4258| HV4283 DUPONT A 1960                       472.952 METERS 2163735.2 |
 HV4258| HV4257 CAFRITZ 1960                        APPROX. 0.6 KM 3393702.1 |
 HV4258|---------------------------------------------------------------------|
 HV4258
 HV4258                          SUPERSEDED SURVEY CONTROL
 HV4258
 HV4258  NAD 83(1991)-  38 54 34.53661(N)    077 02 36.48876(W) AD(       ) 2
 HV4258  NAD 83(1986)-  38 54 34.53623(N)    077 02 36.49923(W) AD(       ) 2
 HV4258  NAD 27      -  38 54 34.13450(N)    077 02 37.58090(W) AD(       ) 2
 HV4258
 HV4258.Superseded values are not recommended for survey control.
 HV4258
 HV4258.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4258.See file dsdata.pdf to determine how the superseded data were derived.
 HV4258
 HV4258_MARKER: DS = TRIANGULATION STATION DISK
 HV4258_SETTING: 0 = UNSPECIFIED SETTING
 HV4258_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4258_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV4258+SATELLITE: SATELLITE OBSERVATIONS - March 15, 2012
 HV4258
 HV4258  HISTORY     - Date     Condition        Report By
 HV4258  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4258  HISTORY     - 1971     GOOD             NGS
 HV4258  HISTORY     - 20120315 GOOD             GEOCAC
 HV4258
 HV4258                          STATION DESCRIPTION
 HV4258
 HV4258'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4258'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4258'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. NW 119A
 HV4258'RESET IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV4258'MANHOLE COVER WITH LID LABELED SURVEY.
 HV4258
 HV4258                          STATION RECOVERY (1971)
 HV4258
 HV4258'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4258'STATION RECOVERED IN GOOD CONDITION AS SHOWN ON DESCRIPTION
 HV4258'SKETCH.  STATION IS UNDER A SQUARE MANHOLE WITH A METAL LID
 HV4258'AND NO LETTERING ON LID.
 HV4258
 HV4258                          STATION RECOVERY (2012)
 HV4258
 HV4258'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV4258'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4302 ***********************************************************************
 HV4302  DESIGNATION -  N W 122 1960
 HV4302  PID         -  HV4302
 HV4302  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4302  COUNTRY     -  US
 HV4302  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4302
 HV4302                         *CURRENT SURVEY CONTROL
 HV4302  ______________________________________________________________________
 HV4302* NAD 83(1993) POSITION- 38 55 01.54550(N) 077 02 10.99107(W)   ADJUSTED
 HV4302* NAVD 88 ORTHO HEIGHT -    30.    (meters)       98.    (feet) SCALED
 HV4302  ______________________________________________________________________
 HV4302  GEOID HEIGHT    -        -32.034 (meters)                     GEOID18
 HV4302  LAPLACE CORR    -         -2.08  (seconds)                    DEFLEC18
 HV4302  HORZ ORDER      -  SECOND
 HV4302
 HV4302.The horizontal coordinates were established by classical geodetic methods
 HV4302.and adjusted by the National Geodetic Survey in November 1994.
 HV4302
 HV4302.The orthometric height was scaled from a topographic map.
 HV4302
 HV4302.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4302.GEOID18 height accuracy estimate available here.
 HV4302
 HV4302.Click photographs - Photos may exist for this station.
 HV4302
 HV4302.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4302
 HV4302. The following values were computed from the NAD 83(1993) position.
 HV4302
 HV4302;                    North         East     Units Scale Factor Converg.
 HV4302;SPC MD       -   138,803.723   396,844.459   MT  0.99995011   -0 01 22.2
 HV4302;SPC MD       -   455,391.88  1,301,980.53   sFT  0.99995011   -0 01 22.2
 HV4302;SPC VA N     - 2,139,809.777 3,626,925.208   MT  0.99996202   +0 54 48.5
 HV4302;SPC VA N     - 7,020,359.24 11,899,337.12   sFT  0.99996202   +0 54 48.5
 HV4302;UTM  18      - 4,309,548.061   323,452.221   MT  0.99998382   -1 16 46.5
 HV4302
 HV4302!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4302!SPC MD       -   1.00000036  x   0.99995011  =   0.99995047
 HV4302!SPC VA N     -   1.00000036  x   0.99996202  =   0.99996238
 HV4302!UTM  18      -   1.00000036  x   0.99998382  =   0.99998418
 HV4302
 HV4302:                Primary Azimuth Mark                     Grid Az
 HV4302:SPC MD       -  N W 119 A 1960                           216 26 08.2
 HV4302:SPC VA N     -  N W 119 A 1960                           215 29 57.5
 HV4302:UTM  18      -  N W 119 A 1960                           217 41 32.5
 HV4302
 HV4302_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2345209548(NAD 83)
 HV4302
 HV4302|---------------------------------------------------------------------|
 HV4302| PID    Reference Object                     Distance      Geod. Az  |
 HV4302|                                                           dddmmss.s |
 HV4302| HV4356 N W 122 A 1960                      APPROX. 0.6 KM 0000255.3 |
 HV4302| HV2159 NW 122 DCDHT RESET                   18.684 METERS 00003     |
 HV4302| HV4258 N W 119 A 1960                      APPROX. 1.0 KM 2162446.0 |
 HV4302|---------------------------------------------------------------------|
 HV4302
 HV4302                          SUPERSEDED SURVEY CONTROL
 HV4302
 HV4302  NAD 83(1991)-  38 55 01.54446(N)    077 02 10.99236(W) AD(       ) 2
 HV4302  NAD 83(1986)-  38 55 01.54401(N)    077 02 11.00287(W) AD(       ) 2
 HV4302  NAD 27      -  38 55 01.14260(N)    077 02 12.08570(W) AD(       ) 2
 HV4302
 HV4302.Superseded values are not recommended for survey control.
 HV4302
 HV4302.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4302.See file dsdata.pdf to determine how the superseded data were derived.
 HV4302
 HV4302_MARKER: DS = TRIANGULATION STATION DISK
 HV4302_SETTING: 0 = UNSPECIFIED SETTING
 HV4302_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4302
 HV4302  HISTORY     - Date     Condition        Report By
 HV4302  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4302
 HV4302                          STATION DESCRIPTION
 HV4302
 HV4302'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4302'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4302'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. N.W. 122
 HV4302'GROUTED IN CONCRETE ISLAND.
 HV4302'
 HV4302'DESTROYED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4356 ***********************************************************************
 HV4356  DESIGNATION -  N W 122 A 1960
 HV4356  PID         -  HV4356
 HV4356  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4356  COUNTRY     -  US
 HV4356  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4356
 HV4356                         *CURRENT SURVEY CONTROL
 HV4356  ______________________________________________________________________
 HV4356* NAD 83(1993) POSITION- 38 55 21.02182(N) 077 02 10.96988(W)   ADJUSTED
 HV4356* NAVD 88 ORTHO HEIGHT -    58.    (meters)      190.    (feet) SCALED
 HV4356  ______________________________________________________________________
 HV4356  GEOID HEIGHT    -        -32.026 (meters)                     GEOID18
 HV4356  LAPLACE CORR    -         -1.96  (seconds)                    DEFLEC18
 HV4356  HORZ ORDER      -  SECOND
 HV4356
 HV4356.The horizontal coordinates were established by classical geodetic methods
 HV4356.and adjusted by the National Geodetic Survey in November 1994.
 HV4356
 HV4356.The orthometric height was scaled from a topographic map.
 HV4356
 HV4356.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4356.GEOID18 height accuracy estimate available here.
 HV4356
 HV4356.Click photographs - Photos may exist for this station.
 HV4356
 HV4356.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4356
 HV4356. The following values were computed from the NAD 83(1993) position.
 HV4356
 HV4356;                    North         East     Units Scale Factor Converg.
 HV4356;SPC MD       -   139,404.288   396,845.209   MT  0.99995018   -0 01 22.2
 HV4356;SPC MD       -   457,362.23  1,301,982.99   sFT  0.99995018   -0 01 22.2
 HV4356;SPC VA N     - 2,140,410.282 3,626,916.144   MT  0.99996252   +0 54 48.5
 HV4356;SPC VA N     - 7,022,329.40 11,899,307.38   sFT  0.99996252   +0 54 48.5
 HV4356;UTM  18      - 4,310,148.486   323,466.143   MT  0.99998376   -1 16 47.0
 HV4356
 HV4356!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4356!SPC MD       -   0.99999596  x   0.99995018  =   0.99994614
 HV4356!SPC VA N     -   0.99999596  x   0.99996252  =   0.99995848
 HV4356!UTM  18      -   0.99999596  x   0.99998376  =   0.99997972
 HV4356
 HV4356:                Primary Azimuth Mark                     Grid Az
 HV4356:SPC MD       -  NW 123                                   000 09 57.5
 HV4356:SPC VA N     -  NW 123                                   359 13 46.8
 HV4356:UTM  18      -  NW 123                                   001 25 22.3
 HV4356
 HV4356_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2346610148(NAD 83)
 HV4356
 HV4356|---------------------------------------------------------------------|
 HV4356| PID    Reference Object                     Distance      Geod. Az  |
 HV4356|                                                           dddmmss.s |
 HV4356| HV2158 NW 123                              APPROX. 0.7 KM 0000835.3 |
 HV4356| HV4302 N W 122 1960                        APPROX. 0.6 KM 1800255.3 |
 HV4356| HV2159 NW 122 DCDHT RESET                  APPROX. 0.6 KM 1800255.6 |
 HV4356|---------------------------------------------------------------------|
 HV4356
 HV4356                          SUPERSEDED SURVEY CONTROL
 HV4356
 HV4356  NAD 83(1991)-  38 55 21.02078(N)    077 02 10.97116(W) AD(       ) 2
 HV4356  NAD 83(1986)-  38 55 21.02034(N)    077 02 10.98155(W) AD(       ) 2
 HV4356  NAD 27      -  38 55 20.61960(N)    077 02 12.06410(W) AD(       ) 2
 HV4356
 HV4356.Superseded values are not recommended for survey control.
 HV4356
 HV4356.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4356.See file dsdata.pdf to determine how the superseded data were derived.
 HV4356
 HV4356_MARKER: Z = SEE DESCRIPTION
 HV4356_SETTING: 0 = UNSPECIFIED SETTING
 HV4356_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4356
 HV4356  HISTORY     - Date     Condition        Report By
 HV4356  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4356  HISTORY     - 1971     GOOD             NGS
 HV4356
 HV4356                          STATION DESCRIPTION
 HV4356
 HV4356'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4356'STATION AND REFERENCE POINTS RECOVERED IN GOOD
 HV4356'CONDITION.  ADDITIONAL MEASUREMENT IS.  65.7 FEET SOUTH OF
 HV4356'INSIDE OF THE SOUTH PILLAR WHERE STEPS GO EAST FROM SIDEWALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4323 ***********************************************************************
 HV4323  DESIGNATION -  N W 123 A 1960
 HV4323  PID         -  HV4323
 HV4323  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4323  COUNTRY     -  US
 HV4323  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4323
 HV4323                         *CURRENT SURVEY CONTROL
 HV4323  ______________________________________________________________________
 HV4323* NAD 83(1993) POSITION- 38 55 59.19203(N) 077 02 10.77998(W)   ADJUSTED
 HV4323* NAVD 88 ORTHO HEIGHT -    59.    (meters)      194.    (feet) SCALED
 HV4323  ______________________________________________________________________
 HV4323  GEOID HEIGHT    -        -32.012 (meters)                     GEOID18
 HV4323  LAPLACE CORR    -         -1.79  (seconds)                    DEFLEC18
 HV4323  HORZ ORDER      -  SECOND
 HV4323
 HV4323.The horizontal coordinates were established by classical geodetic methods
 HV4323.and adjusted by the National Geodetic Survey in November 1994.
 HV4323
 HV4323.The orthometric height was scaled from a topographic map.
 HV4323
 HV4323.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4323.GEOID18 height accuracy estimate available here.
 HV4323
 HV4323.Click photographs - Photos may exist for this station.
 HV4323
 HV4323.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4323
 HV4323. The following values were computed from the NAD 83(1993) position.
 HV4323
 HV4323;                    North         East     Units Scale Factor Converg.
 HV4323;SPC MD       -   140,581.292   396,850.251   MT  0.99995035   -0 01 22.1
 HV4323;SPC MD       -   461,223.79  1,301,999.53   sFT  0.99995035   -0 01 22.1
 HV4323;SPC VA N     - 2,141,587.226 3,626,901.952   MT  0.99996352   +0 54 48.6
 HV4323;SPC VA N     - 7,026,190.76 11,899,260.82   sFT  0.99996352   +0 54 48.6
 HV4323;UTM  18      - 4,311,325.135   323,497.007   MT  0.99998362   -1 16 47.9
 HV4323
 HV4323!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4323!SPC MD       -   0.99999580  x   0.99995035  =   0.99994615
 HV4323!SPC VA N     -   0.99999580  x   0.99996352  =   0.99995932
 HV4323!UTM  18      -   0.99999580  x   0.99998362  =   0.99997942
 HV4323
 HV4323:                Primary Azimuth Mark                     Grid Az
 HV4323:SPC MD       -  NW 123                                   180 20 57.6
 HV4323:SPC VA N     -  NW 123                                   179 24 46.9
 HV4323:UTM  18      -  NW 123                                   181 36 23.4
 HV4323
 HV4323_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2349711325(NAD 83)
 HV4323
 HV4323|---------------------------------------------------------------------|
 HV4323| PID    Reference Object                     Distance      Geod. Az  |
 HV4323|                                                           dddmmss.s |
 HV4323| HV4319 N W 123 B 1960                      APPROX. 0.5 KM 0000240.1 |
 HV4323| HV2158 NW 123                              APPROX. 0.5 KM 1801935.5 |
 HV4323|---------------------------------------------------------------------|
 HV4323
 HV4323                          SUPERSEDED SURVEY CONTROL
 HV4323
 HV4323  NAD 83(1991)-  38 55 59.19101(N)    077 02 10.78121(W) AD(       ) 2
 HV4323  NAD 83(1986)-  38 55 59.19056(N)    077 02 10.79136(W) AD(       ) 2
 HV4323  NAD 27      -  38 55 58.79120(N)    077 02 11.87240(W) AD(       ) 2
 HV4323
 HV4323.Superseded values are not recommended for survey control.
 HV4323
 HV4323.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4323.See file dsdata.pdf to determine how the superseded data were derived.
 HV4323
 HV4323_MARKER: DS = TRIANGULATION STATION DISK
 HV4323_SETTING: 0 = UNSPECIFIED SETTING
 HV4323_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4323
 HV4323  HISTORY     - Date     Condition        Report By
 HV4323  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4323  HISTORY     - 1971     GOOD             NGS
 HV4323
 HV4323                          STATION DESCRIPTION
 HV4323
 HV4323'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4323'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4323'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. N.W. 123-A
 HV4323'GROUTED IN CONCRETE WALK.
 HV4323
 HV4323                          STATION RECOVERY (1971)
 HV4323
 HV4323'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4323'THE STATION MARK DISK WAS RECOVERED IN SIDEWALK AS
 HV4323'DESCRIBED.  HOWEVER, THE DISTANCES TO REFERENCE POINTS DO NOT
 HV4323'CHECK.  MARK POSSIBLY HAS BEEN MOVED AS IT IS PRESENTLY IN OLDER
 HV4323'PORTION OF SIDEWALK, FROM MEASUREMENTS GIVEN TO REFERENCE POINTS
 HV4323'THE LOCATION FOR THE STATION SHOWN TO BE IN PART OF SIDEWALK THAT
 HV4323'HAS BEEN REPLACED BY NEW WALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4319 ***********************************************************************
 HV4319  DESIGNATION -  N W 123 B 1960
 HV4319  PID         -  HV4319
 HV4319  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4319  COUNTRY     -  US
 HV4319  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4319
 HV4319                         *CURRENT SURVEY CONTROL
 HV4319  ______________________________________________________________________
 HV4319* NAD 83(1993) POSITION- 38 56 16.19853(N) 077 02 10.76308(W)   ADJUSTED
 HV4319* NAVD 88 ORTHO HEIGHT -    47.    (meters)      154.    (feet) SCALED
 HV4319  ______________________________________________________________________
 HV4319  GEOID HEIGHT    -        -32.007 (meters)                     GEOID18
 HV4319  LAPLACE CORR    -         -1.83  (seconds)                    DEFLEC18
 HV4319  HORZ ORDER      -  SECOND
 HV4319
 HV4319.The horizontal coordinates were established by classical geodetic methods
 HV4319.and adjusted by the National Geodetic Survey in November 1994.
 HV4319
 HV4319.The orthometric height was scaled from a topographic map.
 HV4319
 HV4319.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4319.GEOID18 height accuracy estimate available here.
 HV4319
 HV4319.Click photographs - Photos may exist for this station.
 HV4319
 HV4319.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4319
 HV4319. The following values were computed from the NAD 83(1993) position.
 HV4319
 HV4319;                    North         East     Units Scale Factor Converg.
 HV4319;SPC MD       -   141,105.700   396,850.867   MT  0.99995043   -0 01 22.1
 HV4319;SPC MD       -   462,944.28  1,302,001.55   sFT  0.99995043   -0 01 22.1
 HV4319;SPC VA N     - 2,142,111.581 3,626,893.998   MT  0.99996398   +0 54 48.6
 HV4319;SPC VA N     - 7,027,911.08 11,899,234.73   sFT  0.99996398   +0 54 48.6
 HV4319;UTM  18      - 4,311,849.421   323,509.129   MT  0.99998357   -1 16 48.4
 HV4319
 HV4319!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4319!SPC MD       -   0.99999768  x   0.99995043  =   0.99994811
 HV4319!SPC VA N     -   0.99999768  x   0.99996398  =   0.99996166
 HV4319!UTM  18      -   0.99999768  x   0.99998357  =   0.99998125
 HV4319
 HV4319:                Primary Azimuth Mark                     Grid Az
 HV4319:SPC MD       -  N W 123 A 1960                           180 04 02.2
 HV4319:SPC VA N     -  N W 123 A 1960                           179 07 51.5
 HV4319:UTM  18      -  N W 123 A 1960                           181 19 28.5
 HV4319
 HV4319_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2350911849(NAD 83)
 HV4319
 HV4319|---------------------------------------------------------------------|
 HV4319| PID    Reference Object                     Distance      Geod. Az  |
 HV4319|                                                           dddmmss.s |
 HV4319| HV4340 N W 123 C 1960                      344.620 METERS 00004     |
 HV4319| HV4323 N W 123 A 1960                      APPROX. 0.5 KM 1800240.1 |
 HV4319|---------------------------------------------------------------------|
 HV4319
 HV4319                          SUPERSEDED SURVEY CONTROL
 HV4319
 HV4319  NAD 83(1991)-  38 56 16.19752(N)    077 02 10.76428(W) AD(       ) 2
 HV4319  NAD 83(1986)-  38 56 16.19707(N)    077 02 10.77434(W) AD(       ) 2
 HV4319  NAD 27      -  38 56 15.79840(N)    077 02 11.85460(W) AD(       ) 2
 HV4319
 HV4319.Superseded values are not recommended for survey control.
 HV4319
 HV4319.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4319.See file dsdata.pdf to determine how the superseded data were derived.
 HV4319
 HV4319_MARKER: Z = SEE DESCRIPTION
 HV4319_SETTING: 0 = UNSPECIFIED SETTING
 HV4319_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4319
 HV4319  HISTORY     - Date     Condition        Report By
 HV4319  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4319  HISTORY     - 1971     GOOD             NGS
 HV4319
 HV4319                          STATION DESCRIPTION
 HV4319
 HV4319'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4319'THE STATION AND REFERENCE POINTS WERE ALL RECOVERED.  THE STATION
 HV4319'IS 4-INCHES UNDER SURFACE OF GROUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4340 ***********************************************************************
 HV4340  DESIGNATION -  N W 123 C 1960
 HV4340  PID         -  HV4340
 HV4340  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4340  COUNTRY     -  US
 HV4340  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4340
 HV4340                         *CURRENT SURVEY CONTROL
 HV4340  ______________________________________________________________________
 HV4340* NAD 83(1993) POSITION- 38 56 27.37396(N) 077 02 10.74505(W)   ADJUSTED
 HV4340* NAVD 88 ORTHO HEIGHT -    50.    (meters)      164.    (feet) SCALED
 HV4340  ______________________________________________________________________
 HV4340  GEOID HEIGHT    -        -32.003 (meters)                     GEOID18
 HV4340  LAPLACE CORR    -         -1.88  (seconds)                    DEFLEC18
 HV4340  HORZ ORDER      -  SECOND
 HV4340
 HV4340.The horizontal coordinates were established by classical geodetic methods
 HV4340.and adjusted by the National Geodetic Survey in November 1994.
 HV4340
 HV4340.The orthometric height was scaled from a topographic map.
 HV4340
 HV4340.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4340.GEOID18 height accuracy estimate available here.
 HV4340
 HV4340.Click photographs - Photos may exist for this station.
 HV4340
 HV4340.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4340
 HV4340. The following values were computed from the NAD 83(1993) position.
 HV4340
 HV4340;                    North         East     Units Scale Factor Converg.
 HV4340;SPC MD       -   141,450.303   396,851.438   MT  0.99995049   -0 01 22.1
 HV4340;SPC MD       -   464,074.87  1,302,003.43   sFT  0.99995049   -0 01 22.1
 HV4340;SPC VA N     - 2,142,456.152 3,626,888.938   MT  0.99996428   +0 54 48.6
 HV4340;SPC VA N     - 7,029,041.56 11,899,218.12   sFT  0.99996428   +0 54 48.6
 HV4340;UTM  18      - 4,312,193.940   323,517.262   MT  0.99998353   -1 16 48.7
 HV4340
 HV4340!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4340!SPC MD       -   0.99999721  x   0.99995049  =   0.99994770
 HV4340!SPC VA N     -   0.99999721  x   0.99996428  =   0.99996149
 HV4340!UTM  18      -   0.99999721  x   0.99998353  =   0.99998074
 HV4340
 HV4340_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2351712193(NAD 83)
 HV4340
 HV4340|---------------------------------------------------------------------|
 HV4340| PID    Reference Object                     Distance      Geod. Az  |
 HV4340|                                                           dddmmss.s |
 HV4340| HV2140 NW 124                              348.344 METERS 00027     |
 HV4340| HV4319 N W 123 B 1960                      344.620 METERS 18004     |
 HV4340|---------------------------------------------------------------------|
 HV4340
 HV4340                          SUPERSEDED SURVEY CONTROL
 HV4340
 HV4340  NAD 83(1991)-  38 56 27.37296(N)    077 02 10.74622(W) AD(       ) 2
 HV4340  NAD 83(1986)-  38 56 27.37251(N)    077 02 10.75624(W) AD(       ) 2
 HV4340  NAD 27      -  38 56 26.97410(N)    077 02 11.83580(W) AD(       ) 2
 HV4340
 HV4340.Superseded values are not recommended for survey control.
 HV4340
 HV4340.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4340.See file dsdata.pdf to determine how the superseded data were derived.
 HV4340
 HV4340_MARKER: Z = SEE DESCRIPTION
 HV4340_SETTING: 0 = UNSPECIFIED SETTING
 HV4340_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4340
 HV4340  HISTORY     - Date     Condition        Report By
 HV4340  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4340  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4340
 HV4340                          STATION DESCRIPTION
 HV4340
 HV4340'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4340'THIS STATION IS BELIEVED LOST, NEITHER THE STATION OR REFERENCE
 HV4340'POINTS WERE RECOVERED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4332 ***********************************************************************
 HV4332  DESIGNATION -  N W 124 A 1960
 HV4332  PID         -  HV4332
 HV4332  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4332  COUNTRY     -  US
 HV4332  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4332
 HV4332                         *CURRENT SURVEY CONTROL
 HV4332  ______________________________________________________________________
 HV4332* NAD 83(1993) POSITION- 38 56 49.47735(N) 077 02 10.72954(W)   ADJUSTED
 HV4332* NAVD 88 ORTHO HEIGHT -    72.    (meters)      236.    (feet) SCALED
 HV4332  ______________________________________________________________________
 HV4332  GEOID HEIGHT    -        -31.998 (meters)                     GEOID18
 HV4332  LAPLACE CORR    -         -2.04  (seconds)                    DEFLEC18
 HV4332  HORZ ORDER      -  SECOND
 HV4332
 HV4332.The horizontal coordinates were established by classical geodetic methods
 HV4332.and adjusted by the National Geodetic Survey in November 1994.
 HV4332
 HV4332.The orthometric height was scaled from a topographic map.
 HV4332
 HV4332.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4332.GEOID18 height accuracy estimate available here.
 HV4332
 HV4332.Click photographs - Photos may exist for this station.
 HV4332
 HV4332.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4332
 HV4332. The following values were computed from the NAD 83(1993) position.
 HV4332
 HV4332;                    North         East     Units Scale Factor Converg.
 HV4332;SPC MD       -   142,131.879   396,852.083   MT  0.99995062   -0 01 22.1
 HV4332;SPC MD       -   466,311.01  1,302,005.54   sFT  0.99995062   -0 01 22.1
 HV4332;SPC VA N     - 2,143,137.657 3,626,878.445   MT  0.99996489   +0 54 48.6
 HV4332;SPC VA N     - 7,031,277.46 11,899,183.70   sFT  0.99996489   +0 54 48.6
 HV4332;UTM  18      - 4,312,875.360   323,532.865   MT  0.99998347   -1 16 49.3
 HV4332
 HV4332!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4332!SPC MD       -   0.99999376  x   0.99995062  =   0.99994438
 HV4332!SPC VA N     -   0.99999376  x   0.99996489  =   0.99995865
 HV4332!UTM  18      -   0.99999376  x   0.99998347  =   0.99997723
 HV4332
 HV4332_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2353212875(NAD 83)
 HV4332
 HV4332|---------------------------------------------------------------------|
 HV4332| PID    Reference Object                     Distance      Geod. Az  |
 HV4332|                                                           dddmmss.s |
 HV4332| HV2139 NW 124 B MADHOP                     278.335 METERS 00006     |
 HV4332| HV2140 NW 124                              333.285 METERS 17936     |
 HV4332|---------------------------------------------------------------------|
 HV4332
 HV4332                          SUPERSEDED SURVEY CONTROL
 HV4332
 HV4332  NAD 83(1991)-  38 56 49.47637(N)    077 02 10.73067(W) AD(       ) 2
 HV4332  NAD 83(1986)-  38 56 49.47592(N)    077 02 10.74060(W) AD(       ) 2
 HV4332  NAD 27      -  38 56 49.07880(N)    077 02 11.81890(W) AD(       ) 2
 HV4332
 HV4332.Superseded values are not recommended for survey control.
 HV4332
 HV4332.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4332.See file dsdata.pdf to determine how the superseded data were derived.
 HV4332
 HV4332_MARKER: Z = SEE DESCRIPTION
 HV4332_SETTING: 0 = UNSPECIFIED SETTING
 HV4332_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4332
 HV4332  HISTORY     - Date     Condition        Report By
 HV4332  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4332  HISTORY     - 1971     GOOD             NGS
 HV4332
 HV4332                          STATION DESCRIPTION
 HV4332
 HV4332'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4332'STATION RECOVERED IN GOOD CONDITION.  FOLLOWING ARE SOME ADDITIONAL
 HV4332'MEASUREMENTS FOR EASIER RECOVERY.  2.0 FEET WEST OF EDGE OF WALK,
 HV4332'17.5 FEET SOUTH-SOUTHWEST OF INSIDE CORNER OF SIDEWALKS, AND 20.5
 HV4332'FEET NORTHWEST OF THE NORTHWEST CORNER OF STEPS TO HOUSE NO. 4643.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4309 ***********************************************************************
 HV4309  DESIGNATION -  N W 124 C 1960
 HV4309  PID         -  HV4309
 HV4309  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4309  COUNTRY     -  US
 HV4309  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4309
 HV4309                         *CURRENT SURVEY CONTROL
 HV4309  ______________________________________________________________________
 HV4309* NAD 83(1993) POSITION- 38 57 06.94596(N) 077 02 10.57053(W)   ADJUSTED
 HV4309* NAVD 88 ORTHO HEIGHT -    72.    (meters)      236.    (feet) SCALED
 HV4309  ______________________________________________________________________
 HV4309  GEOID HEIGHT    -        -31.993 (meters)                     GEOID18
 HV4309  LAPLACE CORR    -         -2.18  (seconds)                    DEFLEC18
 HV4309  HORZ ORDER      -  SECOND
 HV4309
 HV4309.The horizontal coordinates were established by classical geodetic methods
 HV4309.and adjusted by the National Geodetic Survey in November 1994.
 HV4309
 HV4309.The orthometric height was scaled from a topographic map.
 HV4309
 HV4309.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4309.GEOID18 height accuracy estimate available here.
 HV4309
 HV4309.Click photographs - Photos may exist for this station.
 HV4309
 HV4309.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4309
 HV4309. The following values were computed from the NAD 83(1993) position.
 HV4309
 HV4309;                    North         East     Units Scale Factor Converg.
 HV4309;SPC MD       -   142,670.537   396,856.126   MT  0.99995073   -0 01 22.0
 HV4309;SPC MD       -   468,078.25  1,302,018.81   sFT  0.99995073   -0 01 22.0
 HV4309;SPC VA N     - 2,143,676.317 3,626,873.685   MT  0.99996538   +0 54 48.7
 HV4309;SPC VA N     - 7,033,044.72 11,899,168.08   sFT  0.99996538   +0 54 48.7
 HV4309;UTM  18      - 4,313,413.817   323,548.730   MT  0.99998340   -1 16 49.7
 HV4309
 HV4309!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4309!SPC MD       -   0.99999376  x   0.99995073  =   0.99994449
 HV4309!SPC VA N     -   0.99999376  x   0.99996538  =   0.99995914
 HV4309!UTM  18      -   0.99999376  x   0.99998340  =   0.99997716
 HV4309
 HV4309_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2354813413(NAD 83)
 HV4309
 HV4309|---------------------------------------------------------------------|
 HV4309| PID    Reference Object                     Distance      Geod. Az  |
 HV4309|                                                           dddmmss.s |
 HV4309| HV2139 NW 124 B MADHOP                     260.372 METERS 18044     |
 HV4309| HV4329 N W 124 D 1960                      322.496 METERS 35937     |
 HV4309|---------------------------------------------------------------------|
 HV4309
 HV4309                          SUPERSEDED SURVEY CONTROL
 HV4309
 HV4309  NAD 83(1991)-  38 57 06.94499(N)    077 02 10.57161(W) AD(       ) 2
 HV4309  NAD 83(1986)-  38 57 06.94455(N)    077 02 10.58148(W) AD(       ) 2
 HV4309  NAD 27      -  38 57 06.54860(N)    077 02 11.65860(W) AD(       ) 2
 HV4309
 HV4309.Superseded values are not recommended for survey control.
 HV4309
 HV4309.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4309.See file dsdata.pdf to determine how the superseded data were derived.
 HV4309
 HV4309_MARKER: Z = SEE DESCRIPTION
 HV4309_SETTING: 0 = UNSPECIFIED SETTING
 HV4309_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4309
 HV4309  HISTORY     - Date     Condition        Report By
 HV4309  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4309  HISTORY     - 1971     GOOD             NGS
 HV4309
 HV4309                          STATION DESCRIPTION
 HV4309
 HV4309'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4309'STATION RECOVERED IN GOOD CONDITION.  THE NAIL IN LARGE TREE TO
 HV4309'THE EAST REMAINS BUT WASHER IS GONE, BOTH WASHER AND NAIL IN OTHER
 HV4309'REFERENCE TREE IS GONE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4329 ***********************************************************************
 HV4329  DESIGNATION -  N W 124 D 1960
 HV4329  PID         -  HV4329
 HV4329  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4329  COUNTRY     -  US
 HV4329  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4329
 HV4329                         *CURRENT SURVEY CONTROL
 HV4329  ______________________________________________________________________
 HV4329* NAD 83(1993) POSITION- 38 57 17.40368(N) 077 02 10.66192(W)   ADJUSTED
 HV4329* NAVD 88 ORTHO HEIGHT -    81.    (meters)      266.    (feet) SCALED
 HV4329  ______________________________________________________________________
 HV4329  GEOID HEIGHT    -        -31.990 (meters)                     GEOID18
 HV4329  LAPLACE CORR    -         -2.27  (seconds)                    DEFLEC18
 HV4329  HORZ ORDER      -  SECOND
 HV4329
 HV4329.The horizontal coordinates were established by classical geodetic methods
 HV4329.and adjusted by the National Geodetic Survey in November 1994.
 HV4329
 HV4329.The orthometric height was scaled from a topographic map.
 HV4329
 HV4329.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4329.GEOID18 height accuracy estimate available here.
 HV4329
 HV4329.Click photographs - Photos may exist for this station.
 HV4329
 HV4329.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4329
 HV4329. The following values were computed from the NAD 83(1993) position.
 HV4329
 HV4329;                    North         East     Units Scale Factor Converg.
 HV4329;SPC MD       -   142,993.011   396,854.054   MT  0.99995080   -0 01 22.0
 HV4329;SPC MD       -   469,136.24  1,302,012.01   sFT  0.99995080   -0 01 22.0
 HV4329;SPC VA N     - 2,143,998.718 3,626,866.344   MT  0.99996568   +0 54 48.7
 HV4329;SPC VA N     - 7,034,102.46 11,899,144.00   sFT  0.99996568   +0 54 48.7
 HV4329;UTM  18      - 4,313,736.269   323,553.736   MT  0.99998337   -1 16 50.0
 HV4329
 HV4329!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4329!SPC MD       -   0.99999235  x   0.99995080  =   0.99994315
 HV4329!SPC VA N     -   0.99999235  x   0.99996568  =   0.99995803
 HV4329!UTM  18      -   0.99999235  x   0.99998337  =   0.99997572
 HV4329
 HV4329_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2355313736(NAD 83)
 HV4329
 HV4329|---------------------------------------------------------------------|
 HV4329| PID    Reference Object                     Distance      Geod. Az  |
 HV4329|                                                           dddmmss.s |
 HV4329| HV2138 NW 124 E MADHOP                     325.282 METERS 00016     |
 HV4329| HV4309 N W 124 C 1960                      322.496 METERS 17937     |
 HV4329|---------------------------------------------------------------------|
 HV4329
 HV4329                          SUPERSEDED SURVEY CONTROL
 HV4329
 HV4329  NAD 83(1991)-  38 57 17.40272(N)    077 02 10.66297(W) AD(       ) 2
 HV4329  NAD 83(1986)-  38 57 17.40227(N)    077 02 10.67282(W) AD(       ) 2
 HV4329  NAD 27      -  38 57 17.00700(N)    077 02 11.74910(W) AD(       ) 2
 HV4329
 HV4329.Superseded values are not recommended for survey control.
 HV4329
 HV4329.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4329.See file dsdata.pdf to determine how the superseded data were derived.
 HV4329
 HV4329_MARKER: Z = SEE DESCRIPTION
 HV4329_SETTING: 0 = UNSPECIFIED SETTING
 HV4329_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4329
 HV4329  HISTORY     - Date     Condition        Report By
 HV4329  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4329  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4329
 HV4329                          STATION DESCRIPTION
 HV4329
 HV4329'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4329'STATION NOT RECOVERED AND IS BELIEVED LOST.  A NEW SIDEWALK HAS
 HV4329'BEEN PUT IN AND A MANHOLE PUT IN NEAR LOCATION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4298 ***********************************************************************
 HV4298  DESIGNATION -  N W 126 C 1960
 HV4298  PID         -  HV4298
 HV4298  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4298  COUNTRY     -  US
 HV4298  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4298
 HV4298                         *CURRENT SURVEY CONTROL
 HV4298  ______________________________________________________________________
 HV4298* NAD 83(1993) POSITION- 38 58 49.15768(N) 077 02 10.46537(W)   ADJUSTED
 HV4298* NAVD 88 ORTHO HEIGHT -    94.    (meters)      308.    (feet) SCALED
 HV4298  ______________________________________________________________________
 HV4298  GEOID HEIGHT    -        -31.969 (meters)                     GEOID18
 HV4298  LAPLACE CORR    -         -2.43  (seconds)                    DEFLEC18
 HV4298  HORZ ORDER      -  SECOND
 HV4298
 HV4298.The horizontal coordinates were established by classical geodetic methods
 HV4298.and adjusted by the National Geodetic Survey in November 1994.
 HV4298
 HV4298.The orthometric height was scaled from a topographic map.
 HV4298
 HV4298.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4298.GEOID18 height accuracy estimate available here.
 HV4298
 HV4298.Click photographs - Photos may exist for this station.
 HV4298
 HV4298.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4298
 HV4298. The following values were computed from the NAD 83(1993) position.
 HV4298
 HV4298;                    North         East     Units Scale Factor Converg.
 HV4298;SPC MD       -   145,822.331   396,859.909   MT  0.99995151   -0 01 21.9
 HV4298;SPC MD       -   478,418.76  1,302,031.22   sFT  0.99995151   -0 01 21.9
 HV4298;SPC VA N     - 2,146,827.801 3,626,825.964   MT  0.99996839   +0 54 48.8
 HV4298;SPC VA N     - 7,043,384.21 11,899,011.52   sFT  0.99996839   +0 54 48.8
 HV4298;UTM  18      - 4,316,564.869   323,621.715   MT  0.99998308   -1 16 52.4
 HV4298
 HV4298!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4298!SPC MD       -   0.99999030  x   0.99995151  =   0.99994181
 HV4298!SPC VA N     -   0.99999030  x   0.99996839  =   0.99995869
 HV4298!UTM  18      -   0.99999030  x   0.99998308  =   0.99997338
 HV4298
 HV4298_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2362116564(NAD 83)
 HV4298
 HV4298|---------------------------------------------------------------------|
 HV4298| PID    Reference Object                     Distance      Geod. Az  |
 HV4298|                                                           dddmmss.s |
 HV4298| HV2135 NW 127                              332.901 METERS 00006     |
 HV4298| HV2136 NW 126 B MADHOP                     279.157 METERS 17952     |
 HV4298|---------------------------------------------------------------------|
 HV4298
 HV4298                          SUPERSEDED SURVEY CONTROL
 HV4298
 HV4298  NAD 83(1991)-  38 58 49.15684(N)    077 02 10.46618(W) AD(       ) 2
 HV4298  NAD 83(1986)-  38 58 49.15647(N)    077 02 10.47592(W) AD(       ) 2
 HV4298  NAD 27      -  38 58 48.76330(N)    077 02 11.55480(W) AD(       ) 2
 HV4298
 HV4298.Superseded values are not recommended for survey control.
 HV4298
 HV4298.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4298.See file dsdata.pdf to determine how the superseded data were derived.
 HV4298
 HV4298_MARKER: DS = TRIANGULATION STATION DISK
 HV4298_SETTING: 0 = UNSPECIFIED SETTING
 HV4298_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4298
 HV4298  HISTORY     - Date     Condition        Report By
 HV4298  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4298  HISTORY     - 1971     GOOD             NGS
 HV4298  HISTORY     - 1979     GOOD             NGS
 HV4298
 HV4298                          STATION DESCRIPTION
 HV4298
 HV4298'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4298'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4298'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.W. 126-C
 HV4298'GROUTED IN CONCRETE WALK.
 HV4298
 HV4298                          STATION RECOVERY (1971)
 HV4298
 HV4298'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4298'THE STATION AND ALL REFERENCE POINTS WERE RECOVERED AS DESCRIBED
 HV4298'AND IN GOOD CONDITION.
 HV4298
 HV4298                          STATION RECOVERY (1979)
 HV4298
 HV4298'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 (RGP)
 HV4298'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4305 ***********************************************************************
 HV4305  DESIGNATION -  N W 127 A 1960
 HV4305  PID         -  HV4305
 HV4305  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4305  COUNTRY     -  US
 HV4305  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4305
 HV4305                         *CURRENT SURVEY CONTROL
 HV4305  ______________________________________________________________________
 HV4305* NAD 83(1993) POSITION- 38 59 15.15054(N) 077 02 11.16530(W)   ADJUSTED
 HV4305* NAVD 88 ORTHO HEIGHT -    81.    (meters)      266.    (feet) SCALED
 HV4305  ______________________________________________________________________
 HV4305  GEOID HEIGHT    -        -31.963 (meters)                     GEOID18
 HV4305  LAPLACE CORR    -         -2.50  (seconds)                    DEFLEC18
 HV4305  HORZ ORDER      -  SECOND
 HV4305
 HV4305.The horizontal coordinates were established by classical geodetic methods
 HV4305.and adjusted by the National Geodetic Survey in November 1994.
 HV4305
 HV4305.The orthometric height was scaled from a topographic map.
 HV4305
 HV4305.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4305.GEOID18 height accuracy estimate available here.
 HV4305
 HV4305.Click photographs - Photos may exist for this station.
 HV4305
 HV4305.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4305
 HV4305. The following values were computed from the NAD 83(1993) position.
 HV4305
 HV4305;                    North         East     Units Scale Factor Converg.
 HV4305;SPC MD       -   146,623.855   396,843.383   MT  0.99995174   -0 01 22.3
 HV4305;SPC MD       -   481,048.43  1,301,977.00   sFT  0.99995174   -0 01 22.3
 HV4305;SPC VA N     - 2,147,628.962 3,626,796.342   MT  0.99996919   +0 54 48.4
 HV4305;SPC VA N     - 7,046,012.69 11,898,914.33   sFT  0.99996919   +0 54 48.4
 HV4305;UTM  18      - 4,317,366.588   323,622.798   MT  0.99998307   -1 16 53.6
 HV4305
 HV4305!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4305!SPC MD       -   0.99999234  x   0.99995174  =   0.99994408
 HV4305!SPC VA N     -   0.99999234  x   0.99996919  =   0.99996153
 HV4305!UTM  18      -   0.99999234  x   0.99998307  =   0.99997541
 HV4305
 HV4305:                Primary Azimuth Mark                     Grid Az
 HV4305:SPC MD       -  NW 127                                   177 53 34.7
 HV4305:SPC VA N     -  NW 127                                   176 57 24.0
 HV4305:UTM  18      -  NW 127                                   179 09 06.0
 HV4305
 HV4305_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2362217366(NAD 83)
 HV4305
 HV4305|---------------------------------------------------------------------|
 HV4305| PID    Reference Object                     Distance      Geod. Az  |
 HV4305|                                                           dddmmss.s |
 HV4305| HV4242 BLAIR TOWER 1960                    400.844 METERS 0420437.8 |
 HV4305| HV2135 NW 127                              468.979 METERS 1775212.4 |
 HV4305|---------------------------------------------------------------------|
 HV4305
 HV4305                          SUPERSEDED SURVEY CONTROL
 HV4305
 HV4305  NAD 83(1991)-  38 59 15.14974(N)    077 02 11.16606(W) AD(       ) 2
 HV4305  NAD 83(1986)-  38 59 15.14942(N)    077 02 11.17577(W) AD(       ) 2
 HV4305  NAD 27      -  38 59 14.75610(N)    077 02 12.25600(W) AD(       ) 2
 HV4305
 HV4305.Superseded values are not recommended for survey control.
 HV4305
 HV4305.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4305.See file dsdata.pdf to determine how the superseded data were derived.
 HV4305
 HV4305_MARKER: Z = SEE DESCRIPTION
 HV4305_SETTING: 0 = UNSPECIFIED SETTING
 HV4305_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4305
 HV4305  HISTORY     - Date     Condition        Report By
 HV4305  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4305  HISTORY     - 1966     GOOD             LOCENG
 HV4305  HISTORY     - 1971     GOOD             NGS
 HV4305
 HV4305                          STATION DESCRIPTION
 HV4305
 HV4305'DESCRIBED BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (CB)
 HV4305'RECOVERED BY DE LEUW CATHER CO.
 HV4305'
 HV4305'GOOD
 HV4305'
 HV4305'NOTE--THIS IS A PIPE AND SCREW
 HV4305'
 HV4305'ALL TIES ARE GOOD
 HV4305
 HV4305                          STATION RECOVERY (1971)
 HV4305
 HV4305'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4305'STATION WAS RECOVERED AND FOUND TO BE ABOUT 1-INCH BELOW SURFACE
 HV4305'OF GROUND.  ALL REFERENCE POINTS CHECKED.  IT IS ALSO 4.6 FOOT
 HV4305'WEST OF FACE OF CURB AND 21.8 FEET NORTH OF THE LETTER W OF THE
 HV4305'WORD SEWER ON MANHOLE COVER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4107 ***********************************************************************
 HV4107  DESIGNATION -  N W 128 A 1960
 HV4107  PID         -  HV4107
 HV4107  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4107  COUNTRY     -  US
 HV4107  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4107
 HV4107                         *CURRENT SURVEY CONTROL
 HV4107  ______________________________________________________________________
 HV4107* NAD 83(1993) POSITION- 38 58 11.99145(N) 077 01 17.37421(W)   ADJUSTED
 HV4107* NAVD 88 ORTHO HEIGHT -    76.    (meters)      249.    (feet) SCALED
 HV4107  ______________________________________________________________________
 HV4107  GEOID HEIGHT    -        -31.996 (meters)                     GEOID18
 HV4107  LAPLACE CORR    -         -2.60  (seconds)                    DEFLEC18
 HV4107  HORZ ORDER      -  SECOND
 HV4107
 HV4107.The horizontal coordinates were established by classical geodetic methods
 HV4107.and adjusted by the National Geodetic Survey in November 1994.
 HV4107
 HV4107.The orthometric height was scaled from a topographic map.
 HV4107
 HV4107.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4107.GEOID18 height accuracy estimate available here.
 HV4107
 HV4107.Click photographs - Photos may exist for this station.
 HV4107
 HV4107.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4107
 HV4107. The following values were computed from the NAD 83(1993) position.
 HV4107
 HV4107;                    North         East     Units Scale Factor Converg.
 HV4107;SPC MD       -   144,675.869   398,137.458   MT  0.99995119   -0 00 48.6
 HV4107;SPC MD       -   474,657.41  1,306,222.64   sFT  0.99995119   -0 00 48.6
 HV4107;SPC VA N     - 2,145,702.350 3,628,122.097   MT  0.99996727   +0 55 21.9
 HV4107;SPC VA N     - 7,039,691.79 11,903,263.91   sFT  0.99996727   +0 55 21.9
 HV4107;UTM  18      - 4,315,390.594   324,873.816   MT  0.99997766   -1 16 18.0
 HV4107
 HV4107!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4107!SPC MD       -   0.99999313  x   0.99995119  =   0.99994432
 HV4107!SPC VA N     -   0.99999313  x   0.99996727  =   0.99996040
 HV4107!UTM  18      -   0.99999313  x   0.99997766  =   0.99997079
 HV4107
 HV4107_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2487315390(NAD 83)
 HV4107
 HV4107                          SUPERSEDED SURVEY CONTROL
 HV4107
 HV4107  NAD 83(1991)-  38 58 11.99048(N)    077 01 17.37510(W) AD(       ) 2
 HV4107  NAD 83(1986)-  38 58 11.98989(N)    077 01 17.38483(W) AD(       ) 2
 HV4107  NAD 27      -  38 58 11.59640(N)    077 01 18.46450(W) AD(       ) 2
 HV4107
 HV4107.Superseded values are not recommended for survey control.
 HV4107
 HV4107.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4107.See file dsdata.pdf to determine how the superseded data were derived.
 HV4107
 HV4107_MARKER: Z = SEE DESCRIPTION
 HV4107_SETTING: 0 = UNSPECIFIED SETTING
 HV4107_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4107
 HV4107  HISTORY     - Date     Condition        Report By
 HV4107  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4107  HISTORY     - 1966     GOOD             LOCENG
 HV4107  HISTORY     - 1971     GOOD             NGS
 HV4107
 HV4107                          STATION DESCRIPTION
 HV4107
 HV4107'DESCRIBED BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (WST)
 HV4107'RECOVERED BY DE LEUW CATHER CO.
 HV4107'
 HV4107'GOOD
 HV4107
 HV4107                          STATION RECOVERY (1971)
 HV4107
 HV4107'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4107'STATION AND REFERENCE POINTS RECOVERED AS DESCRIBED AND IN GOOD
 HV4107'CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4274 ***********************************************************************
 HV4274  DESIGNATION -  N W 128 B 1960
 HV4274  PID         -  HV4274
 HV4274  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4274  COUNTRY     -  US
 HV4274  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4274
 HV4274                         *CURRENT SURVEY CONTROL
 HV4274  ______________________________________________________________________
 HV4274* NAD 83(1993) POSITION- 38 58 11.92831(N) 077 01 29.49720(W)   ADJUSTED
 HV4274* NAVD 88 ORTHO HEIGHT -    84.    (meters)      276.    (feet) SCALED
 HV4274  ______________________________________________________________________
 HV4274  GEOID HEIGHT    -        -31.991 (meters)                     GEOID18
 HV4274  LAPLACE CORR    -         -2.55  (seconds)                    DEFLEC18
 HV4274  HORZ ORDER      -  SECOND
 HV4274
 HV4274.The horizontal coordinates were established by classical geodetic methods
 HV4274.and adjusted by the National Geodetic Survey in November 1994.
 HV4274
 HV4274.The orthometric height was scaled from a topographic map.
 HV4274
 HV4274.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4274.GEOID18 height accuracy estimate available here.
 HV4274
 HV4274.Click photographs - Photos may exist for this station.
 HV4274
 HV4274.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4274
 HV4274. The following values were computed from the NAD 83(1993) position.
 HV4274
 HV4274;                    North         East     Units Scale Factor Converg.
 HV4274;SPC MD       -   144,673.996   397,845.634   MT  0.99995119   -0 00 56.2
 HV4274;SPC MD       -   474,651.27  1,305,265.22   sFT  0.99995119   -0 00 56.2
 HV4274;SPC VA N     - 2,145,695.708 3,627,830.339   MT  0.99996726   +0 55 14.4
 HV4274;SPC VA N     - 7,039,670.00 11,902,306.70   sFT  0.99996726   +0 55 14.4
 HV4274;UTM  18      - 4,315,395.130   324,582.013   MT  0.99997892   -1 16 25.6
 HV4274
 HV4274!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4274!SPC MD       -   0.99999187  x   0.99995119  =   0.99994306
 HV4274!SPC VA N     -   0.99999187  x   0.99996726  =   0.99995913
 HV4274!UTM  18      -   0.99999187  x   0.99997892  =   0.99997079
 HV4274
 HV4274_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2458215395(NAD 83)
 HV4274
 HV4274                          SUPERSEDED SURVEY CONTROL
 HV4274
 HV4274  NAD 83(1991)-  38 58 11.92735(N)    077 01 29.49809(W) AD(       ) 2
 HV4274  NAD 83(1986)-  38 58 11.92678(N)    077 01 29.50783(W) AD(       ) 2
 HV4274  NAD 27      -  38 58 11.53340(N)    077 01 30.58740(W) AD(       ) 2
 HV4274
 HV4274.Superseded values are not recommended for survey control.
 HV4274
 HV4274.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4274.See file dsdata.pdf to determine how the superseded data were derived.
 HV4274
 HV4274_MARKER: Z = SEE DESCRIPTION
 HV4274_SETTING: 0 = UNSPECIFIED SETTING
 HV4274_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4274
 HV4274  HISTORY     - Date     Condition        Report By
 HV4274  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4274  HISTORY     - 1971     GOOD             NGS
 HV4274
 HV4274                          STATION DESCRIPTION
 HV4274
 HV4274'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4274'THE STATION AND REFERENCE POINTS ALL RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4271 ***********************************************************************
 HV4271  DESIGNATION -  N W 128 C 1960
 HV4271  PID         -  HV4271
 HV4271  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4271  COUNTRY     -  US
 HV4271  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4271
 HV4271                         *CURRENT SURVEY CONTROL
 HV4271  ______________________________________________________________________
 HV4271* NAD 83(1993) POSITION- 38 58 11.98210(N) 077 01 36.09989(W)   ADJUSTED
 HV4271* NAVD 88 ORTHO HEIGHT -    75.    (meters)      246.    (feet) SCALED
 HV4271  ______________________________________________________________________
 HV4271  GEOID HEIGHT    -        -31.989 (meters)                     GEOID18
 HV4271  LAPLACE CORR    -         -2.52  (seconds)                    DEFLEC18
 HV4271  HORZ ORDER      -  SECOND
 HV4271
 HV4271.The horizontal coordinates were established by classical geodetic methods
 HV4271.and adjusted by the National Geodetic Survey in November 1994.
 HV4271
 HV4271.The orthometric height was scaled from a topographic map.
 HV4271
 HV4271.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4271.GEOID18 height accuracy estimate available here.
 HV4271
 HV4271.Click photographs - Photos may exist for this station.
 HV4271
 HV4271.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4271
 HV4271. The following values were computed from the NAD 83(1993) position.
 HV4271
 HV4271;                    North         East     Units Scale Factor Converg.
 HV4271;SPC MD       -   144,675.699   397,686.696   MT  0.99995119   -0 01 00.3
 HV4271;SPC MD       -   474,656.86  1,304,743.77   sFT  0.99995119   -0 01 00.3
 HV4271;SPC VA N     - 2,145,694.815 3,627,671.391   MT  0.99996727   +0 55 10.3
 HV4271;SPC VA N     - 7,039,667.07 11,901,785.22   sFT  0.99996727   +0 55 10.3
 HV4271;UTM  18      - 4,315,400.323   324,423.146   MT  0.99997960   -1 16 29.8
 HV4271
 HV4271!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4271!SPC MD       -   0.99999329  x   0.99995119  =   0.99994448
 HV4271!SPC VA N     -   0.99999329  x   0.99996727  =   0.99996056
 HV4271!UTM  18      -   0.99999329  x   0.99997960  =   0.99997289
 HV4271
 HV4271_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2442315400(NAD 83)
 HV4271
 HV4271                          SUPERSEDED SURVEY CONTROL
 HV4271
 HV4271  NAD 83(1991)-  38 58 11.98114(N)    077 01 36.10078(W) AD(       ) 2
 HV4271  NAD 83(1986)-  38 58 11.98060(N)    077 01 36.11054(W) AD(       ) 2
 HV4271  NAD 27      -  38 58 11.58730(N)    077 01 37.19010(W) AD(       ) 2
 HV4271
 HV4271.Superseded values are not recommended for survey control.
 HV4271
 HV4271.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4271.See file dsdata.pdf to determine how the superseded data were derived.
 HV4271
 HV4271_MARKER: Z = SEE DESCRIPTION
 HV4271_SETTING: 0 = UNSPECIFIED SETTING
 HV4271_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4271
 HV4271  HISTORY     - Date     Condition        Report By
 HV4271  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4271  HISTORY     - 1971     GOOD             NGS
 HV4271
 HV4271                          STATION DESCRIPTION
 HV4271
 HV4271'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4271'THE STATION AND ALL REFERENCE POINTS RECOVERED AS DESCRIBED.  IT
 HV4271'IS ALSO 6-INCHES SOUTH OF THE CORNER OF A BRICK WALL AROUND YARD
 HV4271'OF HOUSE NO. 865.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4277 ***********************************************************************
 HV4277  DESIGNATION -  N W 128 D 1960
 HV4277  PID         -  HV4277
 HV4277  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4277  COUNTRY     -  US
 HV4277  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4277
 HV4277                         *CURRENT SURVEY CONTROL
 HV4277  ______________________________________________________________________
 HV4277* NAD 83(1993) POSITION- 38 58 11.93630(N) 077 01 46.47654(W)   ADJUSTED
 HV4277* NAVD 88 ORTHO HEIGHT -    88.    (meters)      289.    (feet) SCALED
 HV4277  ______________________________________________________________________
 HV4277  GEOID HEIGHT    -        -31.985 (meters)                     GEOID18
 HV4277  LAPLACE CORR    -         -2.49  (seconds)                    DEFLEC18
 HV4277  HORZ ORDER      -  SECOND
 HV4277
 HV4277.The horizontal coordinates were established by classical geodetic methods
 HV4277.and adjusted by the National Geodetic Survey in November 1994.
 HV4277
 HV4277.The orthometric height was scaled from a topographic map.
 HV4277
 HV4277.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4277.GEOID18 height accuracy estimate available here.
 HV4277
 HV4277.Click photographs - Photos may exist for this station.
 HV4277
 HV4277.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4277
 HV4277. The following values were computed from the NAD 83(1993) position.
 HV4277
 HV4277;                    North         East     Units Scale Factor Converg.
 HV4277;SPC MD       -   144,674.364   397,436.910   MT  0.99995119   -0 01 06.8
 HV4277;SPC MD       -   474,652.48  1,303,924.26   sFT  0.99995119   -0 01 06.8
 HV4277;SPC VA N     - 2,145,689.398 3,627,421.656   MT  0.99996727   +0 55 03.8
 HV4277;SPC VA N     - 7,039,649.30 11,900,965.88   sFT  0.99996727   +0 55 03.8
 HV4277;UTM  18      - 4,315,404.473   324,173.384   MT  0.99998068   -1 16 36.3
 HV4277
 HV4277!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4277!SPC MD       -   0.99999125  x   0.99995119  =   0.99994244
 HV4277!SPC VA N     -   0.99999125  x   0.99996727  =   0.99995852
 HV4277!UTM  18      -   0.99999125  x   0.99998068  =   0.99997193
 HV4277
 HV4277_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2417315404(NAD 83)
 HV4277
 HV4277                          SUPERSEDED SURVEY CONTROL
 HV4277
 HV4277  NAD 83(1991)-  38 58 11.93536(N)    077 01 46.47742(W) AD(       ) 2
 HV4277  NAD 83(1986)-  38 58 11.93483(N)    077 01 46.48721(W) AD(       ) 2
 HV4277  NAD 27      -  38 58 11.54170(N)    077 01 47.56670(W) AD(       ) 2
 HV4277
 HV4277.Superseded values are not recommended for survey control.
 HV4277
 HV4277.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4277.See file dsdata.pdf to determine how the superseded data were derived.
 HV4277
 HV4277_MARKER: Z = SEE DESCRIPTION
 HV4277_SETTING: 0 = UNSPECIFIED SETTING
 HV4277_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4277
 HV4277  HISTORY     - Date     Condition        Report By
 HV4277  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4277  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4277
 HV4277                          STATION DESCRIPTION
 HV4277
 HV4277'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4277'THIS STATION WAS DESTROYED WHEN A NEW SIDEWALK WAS PUT IN.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4149 ***********************************************************************
 HV4149  DESIGNATION -  N W 129 A 1960
 HV4149  PID         -  HV4149
 HV4149  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4149  COUNTRY     -  US
 HV4149  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4149
 HV4149                         *CURRENT SURVEY CONTROL
 HV4149  ______________________________________________________________________
 HV4149* NAD 83(1993) POSITION- 38 57 08.86295(N) 077 00 32.96558(W)   ADJUSTED
 HV4149* NAVD 88 ORTHO HEIGHT -    72.    (meters)      236.    (feet) SCALED
 HV4149  ______________________________________________________________________
 HV4149  GEOID HEIGHT    -        -32.024 (meters)                     GEOID18
 HV4149  LAPLACE CORR    -         -2.64  (seconds)                    DEFLEC18
 HV4149  HORZ ORDER      -  SECOND
 HV4149
 HV4149.The horizontal coordinates were established by classical geodetic methods
 HV4149.and adjusted by the National Geodetic Survey in November 1994.
 HV4149
 HV4149.The orthometric height was scaled from a topographic map.
 HV4149
 HV4149.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4149.GEOID18 height accuracy estimate available here.
 HV4149
 HV4149.Click photographs - Photos may exist for this station.
 HV4149
 HV4149.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4149
 HV4149. The following values were computed from the NAD 83(1993) position.
 HV4149
 HV4149;                    North         East     Units Scale Factor Converg.
 HV4149;SPC MD       -   142,729.064   399,206.261   MT  0.99995074   -0 00 20.7
 HV4149;SPC MD       -   468,270.27  1,309,729.21   sFT  0.99995074   -0 00 20.7
 HV4149;SPC VA N     - 2,143,773.239 3,629,222.585   MT  0.99996543   +0 55 49.7
 HV4149;SPC VA N     - 7,033,362.70 11,906,874.43   sFT  0.99996543   +0 55 49.7
 HV4149;UTM  18      - 4,313,420.747   325,899.648   MT  0.99997325   -1 15 48.3
 HV4149
 HV4149!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4149!SPC MD       -   0.99999376  x   0.99995074  =   0.99994450
 HV4149!SPC VA N     -   0.99999376  x   0.99996543  =   0.99995919
 HV4149!UTM  18      -   0.99999376  x   0.99997325  =   0.99996701
 HV4149
 HV4149_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2589913420(NAD 83)
 HV4149
 HV4149|---------------------------------------------------------------------|
 HV4149| PID    Reference Object                     Distance      Geod. Az  |
 HV4149|                                                           dddmmss.s |
 HV4149| HV4157 N W 129 B 1960                      349.799 METERS 17618     |
 HV4149| HV2178 NW 129                              244.499 METERS 35915     |
 HV4149|---------------------------------------------------------------------|
 HV4149
 HV4149                          SUPERSEDED SURVEY CONTROL
 HV4149
 HV4149  NAD 83(1991)-  38 57 08.86193(N)    077 00 32.96654(W) AD(       ) 2
 HV4149  NAD 83(1986)-  38 57 08.86118(N)    077 00 32.97649(W) AD(       ) 2
 HV4149  NAD 27      -  38 57 08.46850(N)    077 00 34.05550(W) AD(       ) 2
 HV4149
 HV4149.Superseded values are not recommended for survey control.
 HV4149
 HV4149.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4149.See file dsdata.pdf to determine how the superseded data were derived.
 HV4149
 HV4149_MARKER: Z = SEE DESCRIPTION
 HV4149_SETTING: 0 = UNSPECIFIED SETTING
 HV4149_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4149
 HV4149  HISTORY     - Date     Condition        Report By
 HV4149  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4149  HISTORY     - 1971     GOOD             NGS
 HV4149
 HV4149                          STATION DESCRIPTION
 HV4149
 HV4149'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4149'STATION AND REFERENCE POINTS RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4157 ***********************************************************************
 HV4157  DESIGNATION -  N W 129 B 1960
 HV4157  PID         -  HV4157
 HV4157  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4157  COUNTRY     -  US
 HV4157  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4157
 HV4157                         *CURRENT SURVEY CONTROL
 HV4157  ______________________________________________________________________
 HV4157* NAD 83(1993) POSITION- 38 56 57.54334(N) 077 00 32.02616(W)   ADJUSTED
 HV4157* NAVD 88 ORTHO HEIGHT -    70.    (meters)      230.    (feet) SCALED
 HV4157  ______________________________________________________________________
 HV4157  GEOID HEIGHT    -        -32.027 (meters)                     GEOID18
 HV4157  LAPLACE CORR    -         -2.66  (seconds)                    DEFLEC18
 HV4157  HORZ ORDER      -  SECOND
 HV4157
 HV4157.The horizontal coordinates were established by classical geodetic methods
 HV4157.and adjusted by the National Geodetic Survey in November 1994.
 HV4157
 HV4157.The orthometric height was scaled from a topographic map.
 HV4157
 HV4157.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4157.GEOID18 height accuracy estimate available here.
 HV4157
 HV4157.Click photographs - Photos may exist for this station.
 HV4157
 HV4157.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4157
 HV4157. The following values were computed from the NAD 83(1993) position.
 HV4157
 HV4157;                    North         East     Units Scale Factor Converg.
 HV4157;SPC MD       -   142,380.012   399,228.847   MT  0.99995067   -0 00 20.1
 HV4157;SPC MD       -   467,125.09  1,309,803.31   sFT  0.99995067   -0 00 20.1
 HV4157;SPC VA N     - 2,143,424.598 3,629,250.871   MT  0.99996511   +0 55 50.2
 HV4157;SPC VA N     - 7,032,218.87 11,906,967.23   sFT  0.99996511   +0 55 50.2
 HV4157;UTM  18      - 4,313,071.275   325,914.567   MT  0.99997318   -1 15 47.4
 HV4157
 HV4157!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4157!SPC MD       -   0.99999408  x   0.99995067  =   0.99994475
 HV4157!SPC VA N     -   0.99999408  x   0.99996511  =   0.99995919
 HV4157!UTM  18      -   0.99999408  x   0.99997318  =   0.99996726
 HV4157
 HV4157_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2591413071(NAD 83)
 HV4157
 HV4157|---------------------------------------------------------------------|
 HV4157| PID    Reference Object                     Distance      Geod. Az  |
 HV4157|                                                           dddmmss.s |
 HV4157| HV4159 N E 129 C 1960                      363.330 METERS 17716     |
 HV4157| HV4149 N W 129 A 1960                      349.799 METERS 35618     |
 HV4157|---------------------------------------------------------------------|
 HV4157
 HV4157                          SUPERSEDED SURVEY CONTROL
 HV4157
 HV4157  NAD 83(1991)-  38 56 57.54233(N)    077 00 32.02713(W) AD(       ) 2
 HV4157  NAD 83(1986)-  38 56 57.54158(N)    077 00 32.03713(W) AD(       ) 2
 HV4157  NAD 27      -  38 56 57.14800(N)    077 00 33.11680(W) AD(       ) 2
 HV4157
 HV4157.Superseded values are not recommended for survey control.
 HV4157
 HV4157.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4157.See file dsdata.pdf to determine how the superseded data were derived.
 HV4157
 HV4157_MARKER: Z = SEE DESCRIPTION
 HV4157_SETTING: 0 = UNSPECIFIED SETTING
 HV4157_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4157
 HV4157  HISTORY     - Date     Condition        Report By
 HV4157  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4157  HISTORY     - 1971     GOOD             NGS
 HV4157
 HV4157                          STATION DESCRIPTION
 HV4157
 HV4157'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4157'STATION RECOVERED IN GOOD CONDITION AND REFERENCE POINTS ARE
 HV4157'ADEQUATE.  NEW REFERENCES ARE 1.9 FEET WEST OF END OF CURB AND
 HV4157'1-INCH NORTH OF EDGE OF MACADAM DRIVE TO CEMETERY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4074 ***********************************************************************
 HV4074  DESIGNATION -  N W 133 1960
 HV4074  PID         -  HV4074
 HV4074  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4074  COUNTRY     -  US
 HV4074  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4074
 HV4074                         *CURRENT SURVEY CONTROL
 HV4074  ______________________________________________________________________
 HV4074* NAD 83(1993) POSITION- 38 54 46.78020(N) 077 01 12.06376(W)   ADJUSTED
 HV4074* NAVD 88 ORTHO HEIGHT -    23.3   (meters)       76.    (feet) VERTCON3
 HV4074  ______________________________________________________________________
 HV4074  GEOID HEIGHT    -        -32.062 (meters)                     GEOID18
 HV4074  LAPLACE CORR    -         -2.79  (seconds)                    DEFLEC18
 HV4074  HORZ ORDER      -  SECOND
 HV4074
 HV4074.The horizontal coordinates were established by classical geodetic methods
 HV4074.and adjusted by the National Geodetic Survey in November 1994.
 HV4074
 HV4074.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4074.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4074
 HV4074.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4074.GEOID18 height accuracy estimate available here.
 HV4074
 HV4074.Click photographs - Photos may exist for this station.
 HV4074
 HV4074.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4074
 HV4074. The following values were computed from the NAD 83(1993) position.
 HV4074
 HV4074;                    North         East     Units Scale Factor Converg.
 HV4074;SPC MD       -   138,347.987   398,263.903   MT  0.99995006   -0 00 45.2
 HV4074;SPC MD       -   453,896.69  1,306,637.49   sFT  0.99995006   -0 00 45.2
 HV4074;SPC VA N     - 2,139,377.291 3,628,351.926   MT  0.99996165   +0 55 25.3
 HV4074;SPC VA N     - 7,018,940.33 11,904,017.94   sFT  0.99996165   +0 55 25.3
 HV4074;UTM  18      - 4,309,061.290   324,861.371   MT  0.99997772   -1 16 09.0
 HV4074
 HV4074!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4074!SPC MD       -   1.00000138  x   0.99995006  =   0.99995144
 HV4074!SPC VA N     -   1.00000138  x   0.99996165  =   0.99996303
 HV4074!UTM  18      -   1.00000138  x   0.99997772  =   0.99997910
 HV4074
 HV4074:                Primary Azimuth Mark                     Grid Az
 HV4074:SPC MD       -  N W 133 A 1960                           180 02 25.8
 HV4074:SPC VA N     -  N W 133 A 1960                           179 06 15.3
 HV4074:UTM  18      -  N W 133 A 1960                           181 17 49.6
 HV4074
 HV4074_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2486109061(NAD 83)
 HV4074
 HV4074|---------------------------------------------------------------------|
 HV4074| PID    Reference Object                     Distance      Geod. Az  |
 HV4074|                                                           dddmmss.s |
 HV4074| HV4075 N W 133 RESET 1961                    0.338 METERS 00719     |
 HV4074| HV4109 N W 133 A 1960                      APPROX. 0.6 KM 1800140.6 |
 HV4074|---------------------------------------------------------------------|
 HV4074
 HV4074                          SUPERSEDED SURVEY CONTROL
 HV4074
 HV4074  NAD 83(1991)-  38 54 46.77911(N)    077 01 12.06493(W) AD(       ) 2
 HV4074  NAD 83(1986)-  38 54 46.77837(N)    077 01 12.07550(W) AD(       ) 2
 HV4074  NAD 27      -  38 54 46.37840(N)    077 01 13.15740(W) AD(       ) 2
 HV4074  NGVD 29 (07/19/86)   23.5    (m)           77.     (f) VERT ANG       
 HV4074
 HV4074.Superseded values are not recommended for survey control.
 HV4074
 HV4074.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4074.See file dsdata.pdf to determine how the superseded data were derived.
 HV4074
 HV4074_MARKER: DS = TRIANGULATION STATION DISK
 HV4074_SETTING: 0 = UNSPECIFIED SETTING
 HV4074_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4074
 HV4074  HISTORY     - Date     Condition        Report By
 HV4074  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4074  HISTORY     - 1971     GOOD             NGS
 HV4074
 HV4074                          STATION DESCRIPTION
 HV4074
 HV4074'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4074'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4074'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.W. 133 SET
 HV4074'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV4074'COVER WITH LID LABELED SURVEY.
 HV4074
 HV4074                          STATION RECOVERY (1971)
 HV4074
 HV4074'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4074'STATION WAS RECOVERED IN GOOD CONDITION.
 HV4074'
 HV4074'IT IS IN SOUTH EDGE OF THE MEDIAL STRIP, ALONG NORTH SIDE OF THE
 HV4074'EAST-BOUND TRAFFIC LANE OF RHODE ISLAND AVENUE, AND IS 14 INCHES
 HV4074'SOUTH OF NW 133 RESET.
 HV4074'
 HV4074'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4074'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4109 ***********************************************************************
 HV4109  DESIGNATION -  N W 133 A 1960
 HV4109  PID         -  HV4109
 HV4109  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4109  COUNTRY     -  US
 HV4109  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4109
 HV4109                         *CURRENT SURVEY CONTROL
 HV4109  ______________________________________________________________________
 HV4109* NAD 83(1993) POSITION- 38 54 25.83412(N) 077 01 12.07684(W)   ADJUSTED
 HV4109* NAVD 88 ORTHO HEIGHT -    27.    (meters)       89.    (feet) SCALED
 HV4109  ______________________________________________________________________
 HV4109  GEOID HEIGHT    -        -32.073 (meters)                     GEOID18
 HV4109  LAPLACE CORR    -         -2.93  (seconds)                    DEFLEC18
 HV4109  HORZ ORDER      -  SECOND
 HV4109
 HV4109.The horizontal coordinates were established by classical geodetic methods
 HV4109.and adjusted by the National Geodetic Survey in November 1994.
 HV4109
 HV4109.The orthometric height was scaled from a topographic map.
 HV4109
 HV4109.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4109.GEOID18 height accuracy estimate available here.
 HV4109
 HV4109.Click photographs - Photos may exist for this station.
 HV4109
 HV4109.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4109
 HV4109. The following values were computed from the NAD 83(1993) position.
 HV4109
 HV4109;                    North         East     Units Scale Factor Converg.
 HV4109;SPC MD       -   137,702.102   398,263.446   MT  0.99995000   -0 00 45.2
 HV4109;SPC MD       -   451,777.65  1,306,635.99   sFT  0.99995000   -0 00 45.2
 HV4109;SPC VA N     - 2,138,731.478 3,628,362.023   MT  0.99996113   +0 55 25.3
 HV4109;SPC VA N     - 7,016,821.52 11,904,051.07   sFT  0.99996113   +0 55 25.3
 HV4109;UTM  18      - 4,308,415.552   324,846.751   MT  0.99997778   -1 16 08.5
 HV4109
 HV4109!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4109!SPC MD       -   1.00000083  x   0.99995000  =   0.99995083
 HV4109!SPC VA N     -   1.00000083  x   0.99996113  =   0.99996196
 HV4109!UTM  18      -   1.00000083  x   0.99997778  =   0.99997861
 HV4109
 HV4109_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2484608415(NAD 83)
 HV4109
 HV4109                          SUPERSEDED SURVEY CONTROL
 HV4109
 HV4109  NAD 83(1991)-  38 54 25.83302(N)    077 01 12.07803(W) AD(       ) 2
 HV4109  NAD 83(1986)-  38 54 25.83234(N)    077 01 12.08858(W) AD(       ) 2
 HV4109  NAD 27      -  38 54 25.43240(N)    077 01 13.17040(W) AD(       ) 2
 HV4109
 HV4109.Superseded values are not recommended for survey control.
 HV4109
 HV4109.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4109.See file dsdata.pdf to determine how the superseded data were derived.
 HV4109
 HV4109_MARKER: DS = TRIANGULATION STATION DISK
 HV4109_SETTING: 0 = UNSPECIFIED SETTING
 HV4109_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4109
 HV4109  HISTORY     - Date     Condition        Report By
 HV4109  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4109  HISTORY     - 1971     SEE DESCRIPTION  NGS
 HV4109
 HV4109                          STATION DESCRIPTION
 HV4109
 HV4109'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4109'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4109'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.W. 133-A
 HV4109'GROUTED IN SIDEWALK.
 HV4109
 HV4109                          STATION RECOVERY (1971)
 HV4109
 HV4109'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4109'STATION HAS BEEN DESTROYED BY CONSTRUCTION OF A NEW CONCRETE
 HV4109'SIDEWALK.  A SMALL CROSS CHISELED INTO THE SIDEWALK WAS FOUND,
 HV4109'INSIDE A SMALL YELLOW CIRCLE, AND A CHECK ON THE DISTANCES FROM
 HV4109'THE 3 REFERENCE POINTS INDICATES THAT IT IS AT THE APPROXIMATE
 HV4109'LOCATION OF THE OLD STATION.
 HV4109'
 HV4109'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4109'IN DISTRICT OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4111 ***********************************************************************
 HV4111  DESIGNATION -  N W 133 B 1960
 HV4111  PID         -  HV4111
 HV4111  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4111  COUNTRY     -  US
 HV4111  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4111
 HV4111                         *CURRENT SURVEY CONTROL
 HV4111  ______________________________________________________________________
 HV4111* NAD 83(1993) POSITION- 38 54 19.58746(N) 077 01 12.06882(W)   ADJUSTED
 HV4111* NAVD 88 ORTHO HEIGHT -    27.    (meters)       89.    (feet) SCALED
 HV4111  ______________________________________________________________________
 HV4111  GEOID HEIGHT    -        -32.077 (meters)                     GEOID18
 HV4111  LAPLACE CORR    -         -2.96  (seconds)                    DEFLEC18
 HV4111  HORZ ORDER      -  SECOND
 HV4111
 HV4111.The horizontal coordinates were established by classical geodetic methods
 HV4111.and adjusted by the National Geodetic Survey in November 1994.
 HV4111
 HV4111.The orthometric height was scaled from a topographic map.
 HV4111
 HV4111.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4111.GEOID18 height accuracy estimate available here.
 HV4111
 HV4111.Click photographs - Photos may exist for this station.
 HV4111
 HV4111.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4111
 HV4111. The following values were computed from the NAD 83(1993) position.
 HV4111
 HV4111;                    North         East     Units Scale Factor Converg.
 HV4111;SPC MD       -   137,509.482   398,263.597   MT  0.99994998   -0 00 45.2
 HV4111;SPC MD       -   451,145.69  1,306,636.48   sFT  0.99994998   -0 00 45.2
 HV4111;SPC VA N     - 2,138,538.884 3,628,365.321   MT  0.99996098   +0 55 25.3
 HV4111;SPC VA N     - 7,016,189.66 11,904,061.89   sFT  0.99996098   +0 55 25.3
 HV4111;UTM  18      - 4,308,222.970   324,842.678   MT  0.99997780   -1 16 08.3
 HV4111
 HV4111!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4111!SPC MD       -   1.00000083  x   0.99994998  =   0.99995081
 HV4111!SPC VA N     -   1.00000083  x   0.99996098  =   0.99996181
 HV4111!UTM  18      -   1.00000083  x   0.99997780  =   0.99997863
 HV4111
 HV4111:                Primary Azimuth Mark                     Grid Az
 HV4111:SPC MD       -  N W 133 C 1960                           180 08 00.1
 HV4111:SPC VA N     -  N W 133 C 1960                           179 11 49.6
 HV4111:UTM  18      -  N W 133 C 1960                           181 23 23.2
 HV4111
 HV4111_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2484208222(NAD 83)
 HV4111
 HV4111|---------------------------------------------------------------------|
 HV4111| PID    Reference Object                     Distance      Geod. Az  |
 HV4111|                                                           dddmmss.s |
 HV4111| HV4108 N W 133 C 1960                      421.808 METERS 1800714.9 |
 HV4111| HV4109 N W 133 A 1960                      192.629 METERS 35957     |
 HV4111|---------------------------------------------------------------------|
 HV4111
 HV4111                          SUPERSEDED SURVEY CONTROL
 HV4111
 HV4111  NAD 83(1991)-  38 54 19.58634(N)    077 01 12.07002(W) AD(       ) 2
 HV4111  NAD 83(1986)-  38 54 19.58572(N)    077 01 12.08058(W) AD(       ) 2
 HV4111  NAD 27      -  38 54 19.18590(N)    077 01 13.16250(W) AD(       ) 2
 HV4111
 HV4111.Superseded values are not recommended for survey control.
 HV4111
 HV4111.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4111.See file dsdata.pdf to determine how the superseded data were derived.
 HV4111
 HV4111_MARKER: Z = SEE DESCRIPTION
 HV4111_SETTING: 0 = UNSPECIFIED SETTING
 HV4111_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4111
 HV4111  HISTORY     - Date     Condition        Report By
 HV4111  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4111  HISTORY     - 1971     GOOD             NGS
 HV4111
 HV4111                          STATION DESCRIPTION
 HV4111
 HV4111'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4111'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE ORIGINAL
 HV4111'DESCRIPTION IS ADEQUATE.  THE PIPE IS IN A CRACK IN THE SIDEWALK,
 HV4111'FLUSH WITH SIDEWALK.
 HV4111'
 HV4111'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4111'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4108 ***********************************************************************
 HV4108  DESIGNATION -  N W 133 C 1960
 HV4108  PID         -  HV4108
 HV4108  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4108  COUNTRY     -  US
 HV4108  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4108
 HV4108                         *CURRENT SURVEY CONTROL
 HV4108  ______________________________________________________________________
 HV4108* NAD 83(1993) POSITION- 38 54 05.90890(N) 077 01 12.10573(W)   ADJUSTED
 HV4108* NAVD 88 ORTHO HEIGHT -    15.    (meters)       49.    (feet) SCALED
 HV4108  ______________________________________________________________________
 HV4108  GEOID HEIGHT    -        -32.084 (meters)                     GEOID18
 HV4108  LAPLACE CORR    -         -3.01  (seconds)                    DEFLEC18
 HV4108  HORZ ORDER      -  SECOND
 HV4108
 HV4108.The horizontal coordinates were established by classical geodetic methods
 HV4108.and adjusted by the National Geodetic Survey in November 1994.
 HV4108
 HV4108.The orthometric height was scaled from a topographic map.
 HV4108
 HV4108.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4108.GEOID18 height accuracy estimate available here.
 HV4108
 HV4108.Click photographs - Photos may exist for this station.
 HV4108
 HV4108.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4108
 HV4108. The following values were computed from the NAD 83(1993) position.
 HV4108
 HV4108;                    North         East     Units Scale Factor Converg.
 HV4108;SPC MD       -   137,087.696   398,262.615   MT  0.99994995   -0 00 45.3
 HV4108;SPC MD       -   449,761.88  1,306,633.26   sFT  0.99994995   -0 00 45.3
 HV4108;SPC VA N     - 2,138,117.134 3,628,371.231   MT  0.99996065   +0 55 25.2
 HV4108;SPC VA N     - 7,014,805.96 11,904,081.28   sFT  0.99996065   +0 55 25.2
 HV4108;UTM  18      - 4,307,801.295   324,832.448   MT  0.99997784   -1 16 07.9
 HV4108
 HV4108!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4108!SPC MD       -   1.00000272  x   0.99994995  =   0.99995267
 HV4108!SPC VA N     -   1.00000272  x   0.99996065  =   0.99996337
 HV4108!UTM  18      -   1.00000272  x   0.99997784  =   0.99998056
 HV4108
 HV4108:                Primary Azimuth Mark                     Grid Az
 HV4108:SPC MD       -  N W 133 B 1960                           000 08 00.2
 HV4108:SPC VA N     -  N W 133 B 1960                           359 11 49.7
 HV4108:UTM  18      -  N W 133 B 1960                           001 23 22.8
 HV4108
 HV4108_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2483207801(NAD 83)
 HV4108
 HV4108|---------------------------------------------------------------------|
 HV4108| PID    Reference Object                     Distance      Geod. Az  |
 HV4108|                                                           dddmmss.s |
 HV4108| HV4111 N W 133 B 1960                      421.808 METERS 0000714.9 |
 HV4108| HV2189 NW 134 DCDHT                        497.097 METERS 1142040.6 |
 HV4108| HV4505 6 H 1981                            157.035 METERS 17202     |
 HV4108|---------------------------------------------------------------------|
 HV4108
 HV4108                          SUPERSEDED SURVEY CONTROL
 HV4108
 HV4108  NAD 83(1991)-  38 54 05.90776(N)    077 01 12.10694(W) AD(       ) 2
 HV4108  NAD 83(1986)-  38 54 05.90720(N)    077 01 12.11753(W) AD(       ) 2
 HV4108  NAD 27      -  38 54 05.50740(N)    077 01 13.19960(W) AD(       ) 2
 HV4108
 HV4108.Superseded values are not recommended for survey control.
 HV4108
 HV4108.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4108.See file dsdata.pdf to determine how the superseded data were derived.
 HV4108
 HV4108_MARKER: Z = SEE DESCRIPTION
 HV4108_SETTING: 0 = UNSPECIFIED SETTING
 HV4108_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4108
 HV4108  HISTORY     - Date     Condition        Report By
 HV4108  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4108  HISTORY     - 1971     GOOD             NGS
 HV4108
 HV4108                          STATION DESCRIPTION
 HV4108
 HV4108'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4108'THE STATION PIPE IS GONE, HOWEVER AT THE INTERSECTION OF THE
 HV4108'DISTANCES FROM THE 3 REFERENCE POINTS A COPPER NAIL, WITH A 3/8-INCH
 HV4108'DIAMETER HEAD, WAS FOUND DRIVEN INTO A CRACK BETWEEN THE CURB AND
 HV4108'A NEW SIDEWALK.  THE 3 REFERENCE POINTS ARE READILY IDENTIFIABLE.
 HV4108'
 HV4108'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4108'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4255 ***********************************************************************
 HV4255  DESIGNATION -  N W 133 D 1960
 HV4255  PID         -  HV4255
 HV4255  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4255  COUNTRY     -  US
 HV4255  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4255
 HV4255                         *CURRENT SURVEY CONTROL
 HV4255  ______________________________________________________________________
 HV4255* NAD 83(1993) POSITION- 38 54 34.48402(N) 077 01 47.96495(W)   ADJUSTED
 HV4255* NAVD 88 ORTHO HEIGHT -    27.    (meters)       89.    (feet) SCALED
 HV4255  ______________________________________________________________________
 HV4255  GEOID HEIGHT    -        -32.055 (meters)                     GEOID18
 HV4255  LAPLACE CORR    -         -2.39  (seconds)                    DEFLEC18
 HV4255  HORZ ORDER      -  SECOND
 HV4255
 HV4255.The horizontal coordinates were established by classical geodetic methods
 HV4255.and adjusted by the National Geodetic Survey in November 1994.
 HV4255
 HV4255.The orthometric height was scaled from a topographic map.
 HV4255
 HV4255.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4255.GEOID18 height accuracy estimate available here.
 HV4255
 HV4255.Click photographs - Photos may exist for this station.
 HV4255
 HV4255.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4255
 HV4255. The following values were computed from the NAD 83(1993) position.
 HV4255
 HV4255;                    North         East     Units Scale Factor Converg.
 HV4255;SPC MD       -   137,969.064   397,398.878   MT  0.99995002   -0 01 07.8
 HV4255;SPC MD       -   452,653.50  1,303,799.49   sFT  0.99995002   -0 01 07.8
 HV4255;SPC VA N     - 2,138,984.279 3,627,493.198   MT  0.99996135   +0 55 02.9
 HV4255;SPC VA N     - 7,017,650.92 11,901,200.60   sFT  0.99996135   +0 55 02.9
 HV4255;UTM  18      - 4,308,701.416   323,988.219   MT  0.99998149   -1 16 31.3
 HV4255
 HV4255!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4255!SPC MD       -   1.00000083  x   0.99995002  =   0.99995085
 HV4255!SPC VA N     -   1.00000083  x   0.99996135  =   0.99996218
 HV4255!UTM  18      -   1.00000083  x   0.99998149  =   0.99998232
 HV4255
 HV4255:                Primary Azimuth Mark                     Grid Az
 HV4255:SPC MD       -  N W 133 E 1960                           269 59 18.4
 HV4255:SPC VA N     -  N W 133 E 1960                           269 03 07.7
 HV4255:UTM  18      -  N W 133 E 1960                           271 14 41.9
 HV4255
 HV4255_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2398808701(NAD 83)
 HV4255
 HV4255|---------------------------------------------------------------------|
 HV4255| PID    Reference Object                     Distance      Geod. Az  |
 HV4255|                                                           dddmmss.s |
 HV4255| HV4306 N W 133 E 1960                      APPROX. 0.6 KM 2695810.6 |
 HV4255|---------------------------------------------------------------------|
 HV4255
 HV4255                          SUPERSEDED SURVEY CONTROL
 HV4255
 HV4255  NAD 83(1991)-  38 54 34.48295(N)    077 01 47.96617(W) AD(       ) 2
 HV4255  NAD 83(1986)-  38 54 34.48244(N)    077 01 47.97688(W) AD(       ) 2
 HV4255  NAD 27      -  38 54 34.08150(N)    077 01 49.05870(W) AD(       ) 2
 HV4255
 HV4255.Superseded values are not recommended for survey control.
 HV4255
 HV4255.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4255.See file dsdata.pdf to determine how the superseded data were derived.
 HV4255
 HV4255_MARKER: Z = SEE DESCRIPTION
 HV4255_SETTING: 0 = UNSPECIFIED SETTING
 HV4255_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4255
 HV4255  HISTORY     - Date     Condition        Report By
 HV4255  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4255  HISTORY     - 1971     GOOD             NGS
 HV4255
 HV4255                          STATION DESCRIPTION
 HV4255
 HV4255'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4255'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE ORIGINAL
 HV4255'DESCRIPTION IS ADEQUATE.  TOP OF PIPE IS PAINTED YELLOW AND IS
 HV4255'FLUSH WITH LAWN.
 HV4255'
 HV4255'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4255'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4306 ***********************************************************************
 HV4306  DESIGNATION -  N W 133 E 1960
 HV4306  PID         -  HV4306
 HV4306  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4306  COUNTRY     -  US
 HV4306  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4306
 HV4306                         *CURRENT SURVEY CONTROL
 HV4306  ______________________________________________________________________
 HV4306* NAD 83(1993) POSITION- 38 54 34.47381(N) 077 02 11.06224(W)   ADJUSTED
 HV4306* NAVD 88 ORTHO HEIGHT -    24.    (meters)       79.    (feet) SCALED
 HV4306  ______________________________________________________________________
 HV4306  GEOID HEIGHT    -        -32.047 (meters)                     GEOID18
 HV4306  LAPLACE CORR    -         -2.18  (seconds)                    DEFLEC18
 HV4306  HORZ ORDER      -  SECOND
 HV4306
 HV4306.The horizontal coordinates were established by classical geodetic methods
 HV4306.and adjusted by the National Geodetic Survey in November 1994.
 HV4306
 HV4306.The orthometric height was scaled from a topographic map.
 HV4306
 HV4306.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4306.GEOID18 height accuracy estimate available here.
 HV4306
 HV4306.Click photographs - Photos may exist for this station.
 HV4306
 HV4306.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4306
 HV4306. The following values were computed from the NAD 83(1993) position.
 HV4306
 HV4306;                    North         East     Units Scale Factor Converg.
 HV4306;SPC MD       -   137,968.951   396,842.411   MT  0.99995002   -0 01 22.3
 HV4306;SPC MD       -   452,653.13  1,301,973.81   sFT  0.99995002   -0 01 22.3
 HV4306;SPC VA N     - 2,138,975.074 3,626,936.802   MT  0.99996135   +0 54 48.4
 HV4306;SPC VA N     - 7,017,620.72 11,899,375.16   sFT  0.99996135   +0 54 48.4
 HV4306;UTM  18      - 4,308,713.507   323,431.866   MT  0.99998391   -1 16 45.8
 HV4306
 HV4306!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4306!SPC MD       -   1.00000130  x   0.99995002  =   0.99995132
 HV4306!SPC VA N     -   1.00000130  x   0.99996135  =   0.99996265
 HV4306!UTM  18      -   1.00000130  x   0.99998391  =   0.99998521
 HV4306
 HV4306_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2343108713(NAD 83)
 HV4306
 HV4306                          SUPERSEDED SURVEY CONTROL
 HV4306
 HV4306  NAD 83(1991)-  38 54 34.47275(N)    077 02 11.06348(W) AD(       ) 2
 HV4306  NAD 83(1986)-  38 54 34.47228(N)    077 02 11.07414(W) AD(       ) 2
 HV4306  NAD 27      -  38 54 34.07090(N)    077 02 12.15580(W) AD(       ) 2
 HV4306
 HV4306.Superseded values are not recommended for survey control.
 HV4306
 HV4306.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4306.See file dsdata.pdf to determine how the superseded data were derived.
 HV4306
 HV4306_MARKER: Z = SEE DESCRIPTION
 HV4306_SETTING: 0 = UNSPECIFIED SETTING
 HV4306_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4306
 HV4306  HISTORY     - Date     Condition        Report By
 HV4306  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4306  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4306
 HV4306                          STATION DESCRIPTION
 HV4306
 HV4306'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4306'STATION WAS NOT FOUND AND IS BELIEVED DESTROYED BY CONSTRUCTION
 HV4306'OF NEW CONCRETE SIDEWALK.
 HV4306'
 HV4306'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4306'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4295 ***********************************************************************
 HV4295  DESIGNATION -  N W 133 F 1960
 HV4295  PID         -  HV4295
 HV4295  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4295  COUNTRY     -  US
 HV4295  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4295
 HV4295                         *CURRENT SURVEY CONTROL
 HV4295  ______________________________________________________________________
 HV4295* NAD 83(1993) POSITION- 38 54 34.46444(N) 077 02 19.41405(W)   ADJUSTED
 HV4295* NAVD 88 ORTHO HEIGHT -    24.    (meters)       79.    (feet) SCALED
 HV4295  ______________________________________________________________________
 HV4295  GEOID HEIGHT    -        -32.045 (meters)                     GEOID18
 HV4295  LAPLACE CORR    -         -2.14  (seconds)                    DEFLEC18
 HV4295  HORZ ORDER      -  SECOND
 HV4295
 HV4295.The horizontal coordinates were established by classical geodetic methods
 HV4295.and adjusted by the National Geodetic Survey in November 1994.
 HV4295
 HV4295.The orthometric height was scaled from a topographic map.
 HV4295
 HV4295.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4295.GEOID18 height accuracy estimate available here.
 HV4295
 HV4295.Click photographs - Photos may exist for this station.
 HV4295
 HV4295.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4295
 HV4295. The following values were computed from the NAD 83(1993) position.
 HV4295
 HV4295;                    North         East     Units Scale Factor Converg.
 HV4295;SPC MD       -   137,968.745   396,641.197   MT  0.99995002   -0 01 27.5
 HV4295;SPC MD       -   452,652.46  1,301,313.66   sFT  0.99995002   -0 01 27.5
 HV4295;SPC VA N     - 2,138,971.580 3,626,735.615   MT  0.99996134   +0 54 43.2
 HV4295;SPC VA N     - 7,017,609.26 11,898,715.10   sFT  0.99996134   +0 54 43.2
 HV4295;UTM  18      - 4,308,717.713   323,230.689   MT  0.99998478   -1 16 51.0
 HV4295
 HV4295!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4295!SPC MD       -   1.00000130  x   0.99995002  =   0.99995132
 HV4295!SPC VA N     -   1.00000130  x   0.99996134  =   0.99996264
 HV4295!UTM  18      -   1.00000130  x   0.99998478  =   0.99998608
 HV4295
 HV4295_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2323008717(NAD 83)
 HV4295
 HV4295                          SUPERSEDED SURVEY CONTROL
 HV4295
 HV4295  NAD 83(1991)-  38 54 34.46338(N)    077 02 19.41532(W) AD(       ) 2
 HV4295  NAD 83(1986)-  38 54 34.46294(N)    077 02 19.42592(W) AD(       ) 2
 HV4295  NAD 27      -  38 54 34.06140(N)    077 02 20.50760(W) AD(       ) 2
 HV4295
 HV4295.Superseded values are not recommended for survey control.
 HV4295
 HV4295.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4295.See file dsdata.pdf to determine how the superseded data were derived.
 HV4295
 HV4295_MARKER: Z = SEE DESCRIPTION
 HV4295_SETTING: 0 = UNSPECIFIED SETTING
 HV4295_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4295
 HV4295  HISTORY     - Date     Condition        Report By
 HV4295  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4295  HISTORY     - 1971     GOOD             NGS
 HV4295
 HV4295                          STATION DESCRIPTION
 HV4295
 HV4295'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4295'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE ORIGINAL
 HV4295'DESCRIPTION IS ADEQUATE, WITH THE FOLLOWING ADDITIONS--STATION IS
 HV4295'6.3 FEET SOUTH OF THE CURB OF P STREET, 43.0 FEET WEST OF CURB
 HV4295'OF 17TH STREET, AND NEAR THE EAST END OF A CONCRETE COBBLE-STONE
 HV4295'SIDEWALK, FLUSH WITH THE SIDEWALK.
 HV4295'
 HV4295'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4295'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4248 ***********************************************************************
 HV4248  DESIGNATION -  N W 133 G 1960
 HV4248  PID         -  HV4248
 HV4248  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4248  COUNTRY     -  US
 HV4248  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4248
 HV4248                         *CURRENT SURVEY CONTROL
 HV4248  ______________________________________________________________________
 HV4248* NAD 83(1993) POSITION- 38 54 34.42861(N) 077 02 29.65989(W)   ADJUSTED
 HV4248* NAVD 88 ORTHO HEIGHT -    26.    (meters)       85.    (feet) SCALED
 HV4248  ______________________________________________________________________
 HV4248  GEOID HEIGHT    -        -32.042 (meters)                     GEOID18
 HV4248  LAPLACE CORR    -         -2.11  (seconds)                    DEFLEC18
 HV4248  HORZ ORDER      -  SECOND
 HV4248
 HV4248.The horizontal coordinates were established by classical geodetic methods
 HV4248.and adjusted by the National Geodetic Survey in November 1994.
 HV4248
 HV4248.The orthometric height was scaled from a topographic map.
 HV4248
 HV4248.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4248.GEOID18 height accuracy estimate available here.
 HV4248
 HV4248.Click photographs - Photos may exist for this station.
 HV4248
 HV4248.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4248
 HV4248. The following values were computed from the NAD 83(1993) position.
 HV4248
 HV4248;                    North         East     Units Scale Factor Converg.
 HV4248;SPC MD       -   137,967.749   396,394.351   MT  0.99995002   -0 01 33.9
 HV4248;SPC MD       -   452,649.19  1,300,503.80   sFT  0.99995002   -0 01 33.9
 HV4248;SPC VA N     - 2,138,966.550 3,626,488.816   MT  0.99996134   +0 54 36.8
 HV4248;SPC VA N     - 7,017,592.76 11,897,905.39   sFT  0.99996134   +0 54 36.8
 HV4248;UTM  18      - 4,308,722.131   322,983.871   MT  0.99998586   -1 16 57.5
 HV4248
 HV4248!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4248!SPC MD       -   1.00000098  x   0.99995002  =   0.99995100
 HV4248!SPC VA N     -   1.00000098  x   0.99996134  =   0.99996232
 HV4248!UTM  18      -   1.00000098  x   0.99998586  =   0.99998684
 HV4248
 HV4248_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2298308722(NAD 83)
 HV4248
 HV4248                          SUPERSEDED SURVEY CONTROL
 HV4248
 HV4248  NAD 83(1991)-  38 54 34.42755(N)    077 02 29.66120(W) AD(       ) 2
 HV4248  NAD 83(1986)-  38 54 34.42714(N)    077 02 29.67174(W) AD(       ) 2
 HV4248  NAD 27      -  38 54 34.02540(N)    077 02 30.75340(W) AD(       ) 2
 HV4248
 HV4248.Superseded values are not recommended for survey control.
 HV4248
 HV4248.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4248.See file dsdata.pdf to determine how the superseded data were derived.
 HV4248
 HV4248_MARKER: Z = SEE DESCRIPTION
 HV4248_SETTING: 0 = UNSPECIFIED SETTING
 HV4248_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4248
 HV4248  HISTORY     - Date     Condition        Report By
 HV4248  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4248  HISTORY     - 1966     GOOD             LOCENG
 HV4248  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4248
 HV4248                          STATION DESCRIPTION
 HV4248
 HV4248'DESCRIBED BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (CJM)
 HV4248'RECOVERED BY DE LEUW CATHER CO.
 HV4248'
 HV4248'GOOD
 HV4248
 HV4248                          STATION RECOVERY (1971)
 HV4248
 HV4248'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4248'STATION HAS BEEN DESTROYED OR COVERED OVER BY A NEW CONCRETE
 HV4248'SIDEWALK.  THE 3 REFERENCE POINTS WERE RECOVERED, AND THE POINT
 HV4248'COULD POSSIBLY BE DETERMINED FROM THEM.
 HV4248'
 HV4248'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4248'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4075 ***********************************************************************
 HV4075  DESIGNATION -  N W 133 RESET 1961
 HV4075  PID         -  HV4075
 HV4075  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4075  COUNTRY     -  US
 HV4075  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4075
 HV4075                         *CURRENT SURVEY CONTROL
 HV4075  ______________________________________________________________________
 HV4075* NAD 83(1993) POSITION- 38 54 46.79108(N) 077 01 12.06197(W)   ADJUSTED
 HV4075* NAVD 88 ORTHO HEIGHT -    23.27  (+/-2cm)       76.3   (feet) VERTCON3
 HV4075  ______________________________________________________________________
 HV4075  GEOID HEIGHT    -        -32.062 (meters)                     GEOID18
 HV4075  LAPLACE CORR    -         -2.79  (seconds)                    DEFLEC18
 HV4075  HORZ ORDER      -  SECOND
 HV4075  VERT ORDER      -  THIRD ? (See Below)
 HV4075
 HV4075.The horizontal coordinates were established by classical geodetic methods
 HV4075.and adjusted by the National Geodetic Survey in November 1994.
 HV4075
 HV4075.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4075.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4075
 HV4075.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4075.GEOID18 height accuracy estimate available here.
 HV4075
 HV4075.The vertical order pertains to the NGVD 29 superseded value.
 HV4075
 HV4075.Click photographs - Photos may exist for this station.
 HV4075
 HV4075.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4075
 HV4075. The following values were computed from the NAD 83(1993) position.
 HV4075
 HV4075;                    North         East     Units Scale Factor Converg.
 HV4075;SPC MD       -   138,348.323   398,263.946   MT  0.99995006   -0 00 45.2
 HV4075;SPC MD       -   453,897.79  1,306,637.63   sFT  0.99995006   -0 00 45.2
 HV4075;SPC VA N     - 2,139,377.627 3,628,351.963   MT  0.99996165   +0 55 25.3
 HV4075;SPC VA N     - 7,018,941.43 11,904,018.07   sFT  0.99996165   +0 55 25.3
 HV4075;UTM  18      - 4,309,061.624   324,861.422   MT  0.99997772   -1 16 09.0
 HV4075
 HV4075!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4075!SPC MD       -   1.00000138  x   0.99995006  =   0.99995144
 HV4075!SPC VA N     -   1.00000138  x   0.99996165  =   0.99996303
 HV4075!UTM  18      -   1.00000138  x   0.99997772  =   0.99997910
 HV4075
 HV4075:                Primary Azimuth Mark                     Grid Az
 HV4075:SPC MD       -  NW 132 RESET                             066 46 11.9
 HV4075:SPC VA N     -  NW 132 RESET                             065 50 01.4
 HV4075:UTM  18      -  NW 132 RESET                             068 01 35.7
 HV4075
 HV4075_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2486109061(NAD 83)
 HV4075
 HV4075|---------------------------------------------------------------------|
 HV4075| PID    Reference Object                     Distance      Geod. Az  |
 HV4075|                                                           dddmmss.s |
 HV4075| HV4498 NW 132 RESET                        APPROX. 1.0 KM 0664526.7 |
 HV4075| HV4437 ST MATTHEWS CH CROSS ON DOME        APPROX. 1.9 KM 2472837.7 |
 HV4075|---------------------------------------------------------------------|
 HV4075
 HV4075                          SUPERSEDED SURVEY CONTROL
 HV4075
 HV4075  NAD 83(1991)-  38 54 46.79000(N)    077 01 12.06315(W) AD(       ) 2
 HV4075  NAD 83(1986)-  38 54 46.78967(N)    077 01 12.07364(W) AD(       ) 2
 HV4075  NAD 27      -  38 54 46.38930(N)    077 01 13.15560(W) AD(       ) 2
 HV4075  NGVD 29              23.50   (m)           77.1    (f) LEVELING    3  
 HV4075
 HV4075.Superseded values are not recommended for survey control.
 HV4075
 HV4075.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4075.See file dsdata.pdf to determine how the superseded data were derived.
 HV4075
 HV4075_MARKER: DS = TRIANGULATION STATION DISK
 HV4075_SETTING: 0 = UNSPECIFIED SETTING
 HV4075_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4075
 HV4075  HISTORY     - Date     Condition        Report By
 HV4075  HISTORY     - 1961     MONUMENTED       CGS
 HV4075  HISTORY     - 1964     GOOD             CGS
 HV4075  HISTORY     - 1971     GOOD             NGS
 HV4075
 HV4075                          STATION DESCRIPTION
 HV4075
 HV4075'DESCRIBED BY COAST AND GEODETIC SURVEY 1961 (CJM)
 HV4075'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4075'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO SE168 RESET IN
 HV4075'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV4075'COVER WITH LID LABELED SURVEY.
 HV4075
 HV4075                          STATION RECOVERY (1964)
 HV4075
 HV4075'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1964 (ELH)
 HV4075'THE STATION WAS RECOVERED AS DESCRIBED AND FOUND TO BE IN
 HV4075'GOOD CONDITION.
 HV4075
 HV4075                          STATION RECOVERY (1971)
 HV4075
 HV4075'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4075'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE ORIGINAL
 HV4075'DESCRIPTION IS ADEQUATE, WITH THE FOLLOWING ADDITION--STATION IS
 HV4075'14 INCHES NORTH OF NW 133 1960.
 HV4075'
 HV4075'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4075'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1894 ***********************************************************************
 HV1894  DESIGNATION -  NATIONAL GEOGRAPHIC
 HV1894  PID         -  HV1894
 HV1894  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1894  COUNTRY     -  US
 HV1894  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1894
 HV1894                         *CURRENT SURVEY CONTROL
 HV1894  ______________________________________________________________________
 HV1894* NAD 83(1986) POSITION- 38 54 18.     (N) 077 02 19.     (W)   SCALED
 HV1894* NAVD 88 ORTHO HEIGHT -    18.410 (meters)       60.40  (feet) ADJUSTED
 HV1894  ______________________________________________________________________
 HV1894  GEOID HEIGHT    -        -32.053 (meters)                     GEOID18
 HV1894  DYNAMIC HEIGHT  -         18.400 (meters)       60.37  (feet) COMP
 HV1894  MODELED GRAVITY -    980,097.3   (mgal)                       NAVD 88
 HV1894
 HV1894  VERT ORDER      -  FIRST     CLASS II
 HV1894
 HV1894.The horizontal coordinates were scaled from a map and have
 HV1894.an estimated accuracy of +/- 6 seconds.
 HV1894
 HV1894.The orthometric height was determined by differential leveling and
 HV1894.adjusted by the NATIONAL GEODETIC SURVEY
 HV1894.in June 1991.
 HV1894
 HV1894.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1894.GEOID18 height accuracy estimate available here.
 HV1894
 HV1894.Click photographs - Photos may exist for this station.
 HV1894
 HV1894.The dynamic height is computed by dividing the NAVD 88
 HV1894.geopotential number by the normal gravity value computed on the
 HV1894.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1894.degrees latitude (g = 980.6199 gals.).
 HV1894
 HV1894.The modeled gravity was interpolated from observed gravity values.
 HV1894
 HV1894
 HV1894_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ232082(NAD 83)
 HV1894
 HV1894                          SUPERSEDED SURVEY CONTROL
 HV1894
 HV1894  NGVD 29 (11/26/84)   18.656  (m)           61.21   (f) ADJUSTED    1 2
 HV1894
 HV1894.Superseded values are not recommended for survey control.
 HV1894
 HV1894.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1894.See file dsdata.pdf to determine how the superseded data were derived.
 HV1894
 HV1894_MARKER: DB = BENCH MARK DISK
 HV1894_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1894_SP_SET: APRON
 HV1894_STAMPING: NATIONAL GEOGRAPHIC 1964 ELEVATION 6 FT 2 INCHES
 HV1894_MARK LOGO: CGS
 HV1894_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1894
 HV1894  HISTORY     - Date     Condition        Report By
 HV1894  HISTORY     - 1964     MONUMENTED       CGS
 HV1894  HISTORY     - 1989     MARK NOT FOUND   USPSQD
 HV1894  HISTORY     - 20040927 GOOD             USPSQD
 HV1894  HISTORY     - 20090319 MARK NOT FOUND   GEOCAC
 HV1894
 HV1894                          STATION DESCRIPTION
 HV1894
 HV1894'DESCRIBED BY COAST AND GEODETIC SURVEY 1964
 HV1894'AT WASHINGTON.
 HV1894'AT WASHINGTON, D.C. AT THE SOUTHEAST QUADRANT OF THE INTERSECTION
 HV1894'OF 17TH STREET AND M STREET, AT THE NEW NATIONAL GEOGRAPHIC
 HV1894'BUILDING COMPLETED IN 1964.  6.6 FEET WEST OF WEST EDGE OF THE
 HV1894'BOTTOM STEP OF THE WEST ENTRANCE TO THE BUILDING.  21.3 FEET
 HV1894'NORTH OF THE SOUTH EDGE OF THE CONCRETE ENTRANCE APRON, 21.0
 HV1894'FEET SOUTH OF THE NORTH EDGE OF THE CONCRETE ENTRANCE APRON,
 HV1894'19.9 FEET EAST OF THE EAST CURB OF 17TH STREET, AND SET IN THE
 HV1894'TOP OF THE CONCRETE ENTRANCE APRON.
 HV1894
 HV1894                          STATION RECOVERY (1989)
 HV1894
 HV1894'RECOVERY NOTE BY US POWER SQUADRON 1989 (MJP)
 HV1894'MARK NOT FOUND.
 HV1894
 HV1894                          STATION RECOVERY (2004)
 HV1894
 HV1894'RECOVERY NOTE BY US POWER SQUADRON 2004
 HV1894'ELEVATION MARK AT STREET LEVEL IS MISSING BUT LAT/LON MARK IS ON
 HV1894'ROOF (10TH STORY) OF NATIONAL GEOGRAPHIC BUILDING AT 17TH AND M.
 HV1894'MARK WAS VIEWED WHEN RESEARCHING FOR AN EXHIBIT.
 HV1894
 HV1894                          STATION RECOVERY (2009)
 HV1894
 HV1894'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV1894'WE SEARCHED DILIGENTLY, BUT THE MARK IS EITHER UNDER THE FROG STATUE
 HV1894'OR HAS BEEN REMOVED DURING RENOVATION OF THE PLAZA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4208 ***********************************************************************
 HV4208  DESIGNATION -  NAVAL 1912
 HV4208  PID         -  HV4208
 HV4208  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4208  COUNTRY     -  US
 HV4208  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4208
 HV4208                         *CURRENT SURVEY CONTROL
 HV4208  ______________________________________________________________________
 HV4208* NAD 83(1993) POSITION- 38 55 15.42918(N) 077 03 57.41950(W)   ADJUSTED
 HV4208* NAVD 88 ORTHO HEIGHT -    81.    (meters)      266.    (feet) SCALED
 HV4208  ______________________________________________________________________
 HV4208  GEOID HEIGHT    -        -31.991 (meters)                     GEOID18
 HV4208  LAPLACE CORR    -         -2.97  (seconds)                    DEFLEC18
 HV4208  HORZ ORDER      -  THIRD
 HV4208
 HV4208.The horizontal coordinates were established by classical geodetic methods
 HV4208.and adjusted by the National Geodetic Survey in November 1994.
 HV4208
 HV4208.The orthometric height was scaled from a topographic map.
 HV4208
 HV4208.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4208.GEOID18 height accuracy estimate available here.
 HV4208
 HV4208.Click photographs - Photos may exist for this station.
 HV4208
 HV4208.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4208
 HV4208. The following values were computed from the NAD 83(1993) position.
 HV4208
 HV4208;                    North         East     Units Scale Factor Converg.
 HV4208;SPC MD       -   139,233.273   394,280.935   MT  0.99995016   -0 02 29.0
 HV4208;SPC MD       -   456,801.16  1,293,570.03   sFT  0.99995016   -0 02 29.0
 HV4208;SPC VA N     - 2,140,197.382 3,624,354.976   MT  0.99996238   +0 53 42.1
 HV4208;SPC VA N     - 7,021,630.91 11,890,904.62   sFT  0.99996238   +0 53 42.1
 HV4208;UTM  18      - 4,310,033.754   320,898.635   MT  0.99999500   -1 17 53.8
 HV4208
 HV4208!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4208!SPC MD       -   0.99999235  x   0.99995016  =   0.99994251
 HV4208!SPC VA N     -   0.99999235  x   0.99996238  =   0.99995473
 HV4208!UTM  18      -   0.99999235  x   0.99999500  =   0.99998735
 HV4208
 HV4208:                Primary Azimuth Mark                     Grid Az
 HV4208:SPC MD       -  HOME RESET                               064 18 25.2
 HV4208:SPC VA N     -  HOME RESET                               063 22 14.1
 HV4208:UTM  18      -  HOME RESET                               065 33 50.0
 HV4208
 HV4208_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2089810033(NAD 83)
 HV4208
 HV4208|---------------------------------------------------------------------|
 HV4208| PID    Reference Object                     Distance      Geod. Az  |
 HV4208|                                                           dddmmss.s |
 HV4208| HV4147 HOME RESET                          APPROX. 5.3 KM 0641556.2 |
 HV4208| HV4365 TRINITY COLLEGE DOME                APPROX. 5.4 KM 0822247.1 |
 HV4208| HV4121 HOWARD UNIVERSITY FLAG ON CUP       APPROX. 4.0 KM 0874907.4 |
 HV4208| HV4158 ECKINGTON PRESB CHURCH SPIRE        APPROX. 5.1 KM 1024529.6 |
 HV4208| HV7692 COLUMBIA DEAF AND DUMB INST FS      APPROX. 6.4 KM 1051904.6 |
 HV4208| HV7696 EASTERN PRESB CH STONE SPIRE        APPROX. 6.6 KM 1170832.2 |
 HV4208| HV4106 HOUSE AND HERMAN STORE DOME         APPROX. 4.4 KM 1195843.5 |
 HV4208| HV7680 NATIONAL CAPITAL BREWERY CUP        APPROX. 8.0 KM 1204403.8 |
 HV4208| HV4165 LIBRARY CONGRESS DOME FINIAL        APPROX. 6.4 KM 1235732.0 |
 HV4208| HV4437 ST MATTHEWS CH CROSS ON DOME        APPROX. 2.7 KM 1255439.6 |
 HV4208| HV4264 OLD POST OFFICE FINIAL              APPROX. 4.4 KM 1312947.1 |
 HV4208| HV4358 ST DOMINIC CHURCH SPIRE             APPROX. 5.8 KM 1363832.7 |
 HV4208| HV4301 HEURICHS BREWERY FINIAL             APPROX. 3.1 KM 1600317.9 |
 HV4208|---------------------------------------------------------------------|
 HV4208
 HV4208                          SUPERSEDED SURVEY CONTROL
 HV4208
 HV4208  NAD 83(1991)-  38 55 15.42824(N)    077 03 57.42103(W) AD(       ) 3
 HV4208  NAD 83(1986)-  38 55 15.42786(N)    077 03 57.43124(W) AD(       ) 3
 HV4208  NAD 27      -  38 55 15.02800(N)    077 03 58.50800(W) AD(       ) 3
 HV4208  USSD        -  38 55 15.36500(N)    077 03 58.33900(W) AD(       ) 3
 HV4208
 HV4208.Superseded values are not recommended for survey control.
 HV4208
 HV4208.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4208.See file dsdata.pdf to determine how the superseded data were derived.
 HV4208
 HV4208_MARKER: Z = SEE DESCRIPTION
 HV4208_SETTING: 0 = UNSPECIFIED SETTING
 HV4208_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4208
 HV4208  HISTORY     - Date     Condition        Report By
 HV4208  HISTORY     - 1912     MONUMENTED       CGS
 HV4208  HISTORY     - 1940     MARK NOT FOUND   CGS
 HV4208
 HV4208                          STATION DESCRIPTION
 HV4208
 HV4208'DESCRIBED BY COAST AND GEODETIC SURVEY 1912 (OBF)
 HV4208'STATION IS LOCATED ON THE ROOF OF THE MAIN OFFICE BUILDING AT
 HV4208'THE U.S. NAVAL OBSERVATORY.
 HV4208'
 HV4208'TO REACH STATION, GO UP WINDING STAIRWAY NEAR W END OF BUILDING
 HV4208'TO THE TOP, THENCE EASTWARD THROUGH A DOOR AND DOWN 3 STEPS
 HV4208'TO THE STONE WALK ALONG TOP OF BUILDING.  STATION IS 1.670 METERS
 HV4208'E OF THE FACE OF THE WALL WHERE YOU HAVE JUST COME OUT AND 0.825
 HV4208'METER FROM N IRON RAIL, 1.895 METERS FROM S IRON RAIL ALONG WALK.
 HV4208'THE N EDGE OF THE STONE WALK IS 1.14 METERS DISTANT FROM STATION
 HV4208'AND S EDGE 2.22 METERS DISTANT.  THE BOTTOM STEP, WHERE YOU
 HV4208'HAVE JUST COME OUT, IS 0.76 METER FROM STATION.  A SMALL HOLE
 HV4208'IN CENTER OF A SHALLOW CROSS MARKS CENTER OF STATION, CUT
 HV4208'IN THE STONE FLOOR (SLATE).
 HV4208
 HV4208                          STATION RECOVERY (1940)
 HV4208
 HV4208'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV4208'STATION NOT RECOVERED.  CROSS-MARK WAS NOT SEARCHED FOR BECAUSE
 HV4208'THE ROOF WAS COVERED OVER WITH A TAR ROOFING COMPOSITION, AND A
 HV4208'BOARDWALK BUILT OVER THIS, BUT THE WALLS AND STEPS REFERENCED TO
 HV4208'THE STATION IN THE ORIGINAL DESCRIPTION ARE UNCHANGED AND THE
 HV4208'STATION CAN BE RECOVERED FROM THESE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2180 ***********************************************************************
 HV2180  DESIGNATION -  NE 129 F MADHOP
 HV2180  PID         -  HV2180
 HV2180  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2180  COUNTRY     -  US
 HV2180  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2180
 HV2180                         *CURRENT SURVEY CONTROL
 HV2180  ______________________________________________________________________
 HV2180* NAD 83(1993) POSITION- 38 57 22.89674(N) 077 00 06.44549(W)   ADJUSTED
 HV2180* NAVD 88 ORTHO HEIGHT -    45.976 (meters)      150.84  (feet) ADJUSTED
 HV2180  ______________________________________________________________________
 HV2180  GEOID HEIGHT    -        -32.032 (meters)                     GEOID18
 HV2180  LAPLACE CORR    -         -2.97  (seconds)                    DEFLEC18
 HV2180  DYNAMIC HEIGHT  -         45.952 (meters)      150.76  (feet) COMP
 HV2180  MODELED GRAVITY -    980,105.9   (mgal)                       NAVD 88
 HV2180
 HV2180  HORZ ORDER      -  SECOND
 HV2180  VERT ORDER      -  SECOND    CLASS 0
 HV2180
 HV2180.The horizontal coordinates were established by classical geodetic methods
 HV2180.and adjusted by the National Geodetic Survey in November 1994.
 HV2180
 HV2180.The orthometric height was determined by differential leveling and
 HV2180.adjusted by the NATIONAL GEODETIC SURVEY
 HV2180.in June 1991.
 HV2180
 HV2180.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2180.GEOID18 height accuracy estimate available here.
 HV2180
 HV2180.Click photographs - Photos may exist for this station.
 HV2180
 HV2180.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2180
 HV2180.The dynamic height is computed by dividing the NAVD 88
 HV2180.geopotential number by the normal gravity value computed on the
 HV2180.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2180.degrees latitude (g = 980.6199 gals.).
 HV2180
 HV2180.The modeled gravity was interpolated from observed gravity values.
 HV2180
 HV2180. The following values were computed from the NAD 83(1993) position.
 HV2180
 HV2180;                    North         East     Units Scale Factor Converg.
 HV2180;SPC MD       -   143,161.770   399,844.815   MT  0.99995083   -0 00 04.0
 HV2180;SPC MD       -   469,689.91  1,311,824.20   sFT  0.99995083   -0 00 04.0
 HV2180;SPC VA N     - 2,144,216.327 3,629,853.993   MT  0.99996583   +0 56 06.2
 HV2180;SPC VA N     - 7,034,816.40 11,908,945.98   sFT  0.99996583   +0 56 06.2
 HV2180;UTM  18      - 4,313,839.341   326,547.560   MT  0.99997047   -1 15 32.0
 HV2180
 HV2180!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2180!SPC MD       -   0.99999781  x   0.99995083  =   0.99994864
 HV2180!SPC VA N     -   0.99999781  x   0.99996583  =   0.99996364
 HV2180!UTM  18      -   0.99999781  x   0.99997047  =   0.99996828
 HV2180
 HV2180_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2654713839(NAD 83)
 HV2180
 HV2180|---------------------------------------------------------------------|
 HV2180| PID    Reference Object                     Distance      Geod. Az  |
 HV2180|                                                           dddmmss.s |
 HV2180| HV4163 N E 129 E 1960                      384.810 METERS 25313     |
 HV2180|---------------------------------------------------------------------|
 HV2180
 HV2180                          SUPERSEDED SURVEY CONTROL
 HV2180
 HV2180  NAD 83(1991)-  38 57 22.89572(N)    077 00 06.44642(W) AD(       ) 2
 HV2180  NAD 83(1986)-  38 57 22.89487(N)    077 00 06.45632(W) AD(       ) 2
 HV2180  NAD 27      -  38 57 22.50220(N)    077 00 07.53350(W) AD(       ) 2
 HV2180  NGVD 29              46.21   (m)          151.6    (f) LEVELING    3  
 HV2180  NGVD 29 (11/26/84)   46.206  (m)          151.59   (f) ADJUSTED    2 0
 HV2180
 HV2180.Superseded values are not recommended for survey control.
 HV2180
 HV2180.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2180.See file dsdata.pdf to determine how the superseded data were derived.
 HV2180
 HV2180_MARKER: Z = SEE DESCRIPTION
 HV2180_SETTING: 0 = UNSPECIFIED SETTING
 HV2180_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2180
 HV2180  HISTORY     - Date     Condition        Report By
 HV2180  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2180  HISTORY     - 1960     GOOD             MADHOP
 HV2180  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV2180
 HV2180                          STATION DESCRIPTION
 HV2180
 HV2180'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2180'IN WASHINGTON DC.
 HV2180'LOCATED AT THE Y INTERSECTION OF SOUTH DAKOTA AVE. N.E. AND RIGGS
 HV2180'RD. N.E. ON THE WEST SIDE OF INTERSECTION, 26.83 FT. NORTHWEST
 HV2180'OF CROSS CUT IN MANHOLE RIM ON NORTH END OF ISLAND, AND 48.35 FT.
 HV2180'SOUTHWEST OF BASE OF SIGNAL LIGHT IN ISLAND OF RD., AND 3.30 FT.
 HV2180'SOUTH OF SIGNAL LIGHT BASE ADJACENT TO ROAD.  A PIPE AND SCREW
 HV2180'ADJACENT TO ROAD.
 HV2180
 HV2180                          STATION RECOVERY (1971)
 HV2180
 HV2180'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2180'STATION WAS NOT FOUND, ALTHOUGH DIGGING WAS DONE AT THE POINT
 HV2180'INDICATED BY THE REFERENCE MEASUREMENTS IN ORIGINAL DESCRIPTION.
 HV2180'
 HV2180'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2180'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2179 ***********************************************************************
 HV2179  DESIGNATION -  NE 130 DCDHT
 HV2179  PID         -  HV2179
 HV2179  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2179  COUNTRY     -  US
 HV2179  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2179
 HV2179                         *CURRENT SURVEY CONTROL
 HV2179  ______________________________________________________________________
 HV2179* NAD 83(1993) POSITION- 38 56 31.72626(N) 077 00 26.90024(W)   ADJUSTED
 HV2179* NAVD 88 ORTHO HEIGHT -    96.061 (meters)      315.16  (feet) ADJUSTED
 HV2179  ______________________________________________________________________
 HV2179  GEOID HEIGHT    -        -32.035 (meters)                     GEOID18
 HV2179  LAPLACE CORR    -         -2.83  (seconds)                    DEFLEC18
 HV2179  DYNAMIC HEIGHT  -         96.011 (meters)      315.00  (feet) COMP
 HV2179  MODELED GRAVITY -    980,105.9   (mgal)                       NAVD 88
 HV2179
 HV2179  HORZ ORDER      -  SECOND
 HV2179  VERT ORDER      -  SECOND    CLASS 0
 HV2179
 HV2179.The horizontal coordinates were established by classical geodetic methods
 HV2179.and adjusted by the National Geodetic Survey in November 1994.
 HV2179
 HV2179.The orthometric height was determined by differential leveling and
 HV2179.adjusted by the NATIONAL GEODETIC SURVEY
 HV2179.in June 1991.
 HV2179
 HV2179.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2179.GEOID18 height accuracy estimate available here.
 HV2179
 HV2179.Click photographs - Photos may exist for this station.
 HV2179
 HV2179.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2179
 HV2179.The dynamic height is computed by dividing the NAVD 88
 HV2179.geopotential number by the normal gravity value computed on the
 HV2179.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2179.degrees latitude (g = 980.6199 gals.).
 HV2179
 HV2179.The modeled gravity was interpolated from observed gravity values.
 HV2179
 HV2179. The following values were computed from the NAD 83(1993) position.
 HV2179
 HV2179;                    North         East     Units Scale Factor Converg.
 HV2179;SPC MD       -   141,583.910   399,352.208   MT  0.99995052   -0 00 16.9
 HV2179;SPC MD       -   464,513.21  1,310,208.04   sFT  0.99995052   -0 00 16.9
 HV2179;SPC VA N     - 2,142,630.606 3,629,387.225   MT  0.99996440   +0 55 53.4
 HV2179;SPC VA N     - 7,029,613.91 11,907,414.59   sFT  0.99996440   +0 55 53.4
 HV2179;UTM  18      - 4,312,272.640   326,020.430   MT  0.99997273   -1 15 43.5
 HV2179
 HV2179!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2179!SPC MD       -   0.99998995  x   0.99995052  =   0.99994048
 HV2179!SPC VA N     -   0.99998995  x   0.99996440  =   0.99995435
 HV2179!UTM  18      -   0.99998995  x   0.99997273  =   0.99996268
 HV2179
 HV2179:                Primary Azimuth Mark                     Grid Az
 HV2179:SPC MD       -  CAPITOL STATUE OF FREEDOM HEAD           181 21 41.7
 HV2179:SPC VA N     -  CAPITOL STATUE OF FREEDOM HEAD           180 25 31.4
 HV2179:UTM  18      -  CAPITOL STATUE OF FREEDOM HEAD           182 37 08.3
 HV2179
 HV2179_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2602012272(NAD 83)
 HV2179
 HV2179|---------------------------------------------------------------------|
 HV2179| PID    Reference Object                     Distance      Geod. Az  |
 HV2179|                                                           dddmmss.s |
 HV2179| HV4150 CAPITOL STATUE OF FREEDOM HEAD      APPROX. 5.8 KM 1812124.8 |
 HV2179| HV4160 N E 130 A 1960                      180.482 METERS 19046     |
 HV2179| HV4161 N W 129 D 1960                      264.045 METERS 35601     |
 HV2179|---------------------------------------------------------------------|
 HV2179
 HV2179                          SUPERSEDED SURVEY CONTROL
 HV2179
 HV2179  NAD 83(1991)-  38 56 31.72525(N)    077 00 26.90124(W) AD(       ) 2
 HV2179  NAD 83(1986)-  38 56 31.72450(N)    077 00 26.91135(W) AD(       ) 2
 HV2179  NAD 27      -  38 56 31.32850(N)    077 00 27.99150(W) AD(       ) 2
 HV2179  NGVD 29              96.29   (m)          315.9    (f) LEVELING    3  
 HV2179  NGVD 29 (11/26/84)   96.290  (m)          315.91   (f) ADJUSTED    2 0
 HV2179
 HV2179.Superseded values are not recommended for survey control.
 HV2179
 HV2179.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2179.See file dsdata.pdf to determine how the superseded data were derived.
 HV2179
 HV2179_MARKER: DD = SURVEY DISK
 HV2179_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2179_SP_SET: MONUMENT
 HV2179_STAMPING: USCGS NO NE 130
 HV2179_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2179_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV2179+SATELLITE: SATELLITE OBSERVATIONS - February 28, 2014
 HV2179
 HV2179  HISTORY     - Date     Condition        Report By
 HV2179  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2179  HISTORY     - 1960     GOOD             MADHOP
 HV2179  HISTORY     - 1971     GOOD             NGS
 HV2179  HISTORY     - 20140228 GOOD             INDIV
 HV2179
 HV2179                          STATION DESCRIPTION
 HV2179
 HV2179'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2179'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2179'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. N.E. 130 SET IN
 HV2179'TOP OF 12 IN CONCRETE MOUNUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2179'COVER WITH LID LABELED SURVEY.
 HV2179
 HV2179                          STATION RECOVERY (1960)
 HV2179
 HV2179'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2179'IN WASHINGTON DC.
 HV2179'LOCATED ON HAREWOOD RD. N.E. ADJACENT TO ATHLETIC FIELD, AND
 HV2179'SOUTHWEST OF INTERSECTION OF HAREWOOD, DRIVE N.E., AND CIREMONT.
 HV2179'54.24 FT. SOUTHWEST OF CROSS CUT IN MANHOLE IN INTERSECTION,
 HV2179'AND 47.21 FT. SOUTHEAST OF CROSS CUT IN RIM OF MANHOLE ON
 HV2179'NORTHSIDE OF HAREWOOD RD., AND 30.62 FT. SOUTHEAST OF A NAIL AND
 HV2179'WASHER IN P.E.P.C.O. POLE 5213.  A STANDARD BRASS DISC SET IN
 HV2179'TOP OF 12 IN. CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV2179'MANHOLE COVER WITH LID LABELED SURVEY.
 HV2179
 HV2179                          STATION RECOVERY (1971)
 HV2179
 HV2179'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2179'STATION RECOVERED IN GOOD CONDITION WITH REFERENCE POINTS GIVEN
 HV2179'ADEQUATE.  THE LID OF MANHOLE COVERING STATION IS 1-INCH BELOW
 HV2179'SURFACE OF GROUND.  ADDITIONAL MEASUREMENTS ARE.  18.0 FEET
 HV2179'WEST OF SLIGHT ANGLE IN FENCE, 54.5 FEET SOUTHWEST OF BOLT AT
 HV2179'BASE OF TRAFFIC LIGHT POST, 9.0 FEET NORTH OF CHAIN-LINKED FENCE,
 HV2179'AND 8.0 FEET SOUTHEAST OF INSIDE CORNER OF SIDEWALK.
 HV2179
 HV2179                          STATION RECOVERY (2014)
 HV2179
 HV2179'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2014 (BSU)
 HV2179'RECOVERED AS DESCRIBED, 1' BELOW SOIL SURFACE IN GOOD CONDITION BY
 HV2179'JMT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2182 ***********************************************************************
 HV2182  DESIGNATION -  NE 131 B
 HV2182  PID         -  HV2182
 HV2182  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2182  COUNTRY     -  US
 HV2182  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2182
 HV2182                         *CURRENT SURVEY CONTROL
 HV2182  ______________________________________________________________________
 HV2182* NAD 83(1993) POSITION- 38 55 16.42595(N) 077 00 32.11649(W)   ADJUSTED
 HV2182* NAVD 88 ORTHO HEIGHT -    43.625 (meters)      143.13  (feet) ADJUSTED
 HV2182  ______________________________________________________________________
 HV2182  GEOID HEIGHT    -        -32.063 (meters)                     GEOID18
 HV2182  LAPLACE CORR    -         -3.12  (seconds)                    DEFLEC18
 HV2182  DYNAMIC HEIGHT  -         43.602 (meters)      143.05  (feet) COMP
 HV2182  MODELED GRAVITY -    980,105.4   (mgal)                       NAVD 88
 HV2182
 HV2182  HORZ ORDER      -  SECOND
 HV2182  VERT ORDER      -  SECOND    CLASS 0
 HV2182
 HV2182.The horizontal coordinates were established by classical geodetic methods
 HV2182.and adjusted by the National Geodetic Survey in November 1994.
 HV2182
 HV2182.The orthometric height was determined by differential leveling and
 HV2182.adjusted by the NATIONAL GEODETIC SURVEY
 HV2182.in June 1991.
 HV2182
 HV2182.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2182.GEOID18 height accuracy estimate available here.
 HV2182
 HV2182.Click photographs - Photos may exist for this station.
 HV2182
 HV2182.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2182
 HV2182.The dynamic height is computed by dividing the NAVD 88
 HV2182.geopotential number by the normal gravity value computed on the
 HV2182.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2182.degrees latitude (g = 980.6199 gals.).
 HV2182
 HV2182.The modeled gravity was interpolated from observed gravity values.
 HV2182
 HV2182. The following values were computed from the NAD 83(1993) position.
 HV2182
 HV2182;                    North         East     Units Scale Factor Converg.
 HV2182;SPC MD       -   139,261.981   399,226.367   MT  0.99995016   -0 00 20.2
 HV2182;SPC MD       -   456,895.35  1,309,795.17   sFT  0.99995016   -0 00 20.2
 HV2182;SPC VA N     - 2,140,306.900 3,629,299.338   MT  0.99996240   +0 55 50.2
 HV2182;SPC VA N     - 7,021,990.22 11,907,126.24   sFT  0.99996240   +0 55 50.2
 HV2182;UTM  18      - 4,309,953.977   325,843.675   MT  0.99997349   -1 15 44.7
 HV2182
 HV2182!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2182!SPC MD       -   0.99999819  x   0.99995016  =   0.99994835
 HV2182!SPC VA N     -   0.99999819  x   0.99996240  =   0.99996059
 HV2182!UTM  18      -   0.99999819  x   0.99997349  =   0.99997168
 HV2182
 HV2182_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2584309953(NAD 83)
 HV2182
 HV2182                          SUPERSEDED SURVEY CONTROL
 HV2182
 HV2182  NAD 83(1991)-  38 55 16.42488(N)    077 00 32.11758(W) AD(       ) 2
 HV2182  NAD 83(1986)-  38 55 16.42405(N)    077 00 32.12800(W) AD(       ) 2
 HV2182  NAD 27      -  38 55 16.02500(N)    077 00 33.20950(W) AD(       ) 2
 HV2182  NGVD 29              43.86   (m)          143.9    (f) LEVELING    3  
 HV2182  NGVD 29 (11/26/84)   43.856  (m)          143.88   (f) ADJUSTED    2 0
 HV2182
 HV2182.Superseded values are not recommended for survey control.
 HV2182
 HV2182.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2182.See file dsdata.pdf to determine how the superseded data were derived.
 HV2182
 HV2182_MARKER: I = METAL ROD
 HV2182_SETTING: 17 = SET INTO TOP OF METAL PIPE DRIVEN INTO GROUND
 HV2182_MAGNETIC: P = MARKER IS A STEEL PIPE
 HV2182_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2182
 HV2182  HISTORY     - Date     Condition        Report By
 HV2182  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2182  HISTORY     - 1960     GOOD             MADHOP
 HV2182  HISTORY     - 1964     MARK NOT FOUND   CGS
 HV2182  HISTORY     - 1964     MARK NOT FOUND   CGS
 HV2182  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV2182
 HV2182                          STATION DESCRIPTION
 HV2182
 HV2182'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2182'IN WASHINGTON DC.
 HV2182'LOCATED AT INTERSECTION OF NORTH CAPITOL ST. AND BRYANT ST. N.E.
 HV2182'IN SOUTHEAST CORNER OF INTERSECTION.  32.89 FT. SOUTHEAST OF
 HV2182'CROSS CUT IN MANHOLE RIM (NORTH CAPITOL ST.), AND 29.53 FT.
 HV2182'SOUTHWEST OF CROSS CUT IN MANHOLE RIM (ON BRYANT ST.), AND 14.65 FT.
 HV2182'SOUTHWEST OF CROSS CUT IN MANHOLE RIM ADJACENT TO ROAD (BRYANT
 HV2182'STREET) A PIPE AND TACK SET IN CORNER OF SIDEWALK.
 HV2182
 HV2182                          STATION RECOVERY (1964)
 HV2182
 HV2182'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1964
 HV2182'MARK NOT FOUND.
 HV2182
 HV2182                          STATION RECOVERY (1964)
 HV2182
 HV2182'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1964 (ELH)
 HV2182'THE STATION WAS SEARCHED FOR AND WAS NOT FOUND.  IT IS BELIEVED
 HV2182'IT WAS DESTROYED DUE TO CONSTRUCTION.
 HV2182
 HV2182                          STATION RECOVERY (1971)
 HV2182
 HV2182'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2182'STATION WAS DESTROYED.  A NEW SIDEWALK COVERS THE STATION SITE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2181 ***********************************************************************
 HV2181  DESIGNATION -  NE 131 DCDHT
 HV2181  PID         -  HV2181
 HV2181  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2181  COUNTRY     -  US
 HV2181  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2181
 HV2181                         *CURRENT SURVEY CONTROL
 HV2181  ______________________________________________________________________
 HV2181* NAD 83(1993) POSITION- 38 55 51.04263(N) 077 00 25.02222(W)   ADJUSTED
 HV2181* NAVD 88 ORTHO HEIGHT -    64.794 (meters)      212.58  (feet) ADJUSTED
 HV2181  ______________________________________________________________________
 HV2181  GEOID HEIGHT    -        -32.050 (meters)                     GEOID18
 HV2181  LAPLACE CORR    -         -3.07  (seconds)                    DEFLEC18
 HV2181  DYNAMIC HEIGHT  -         64.760 (meters)      212.47  (feet) COMP
 HV2181  MODELED GRAVITY -    980,106.1   (mgal)                       NAVD 88
 HV2181
 HV2181  HORZ ORDER      -  SECOND
 HV2181  VERT ORDER      -  SECOND    CLASS 0
 HV2181
 HV2181.The horizontal coordinates were established by classical geodetic methods
 HV2181.and adjusted by the National Geodetic Survey in November 1994.
 HV2181
 HV2181.The orthometric height was determined by differential leveling and
 HV2181.adjusted by the NATIONAL GEODETIC SURVEY
 HV2181.in June 1991.
 HV2181
 HV2181.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2181.GEOID18 height accuracy estimate available here.
 HV2181
 HV2181.Click photographs - Photos may exist for this station.
 HV2181
 HV2181.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2181
 HV2181.The dynamic height is computed by dividing the NAVD 88
 HV2181.geopotential number by the normal gravity value computed on the
 HV2181.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2181.degrees latitude (g = 980.6199 gals.).
 HV2181
 HV2181.The modeled gravity was interpolated from observed gravity values.
 HV2181
 HV2181. The following values were computed from the NAD 83(1993) position.
 HV2181
 HV2181;                    North         East     Units Scale Factor Converg.
 HV2181;SPC MD       -   140,329.396   399,397.337   MT  0.99995031   -0 00 15.7
 HV2181;SPC MD       -   460,397.36  1,310,356.10   sFT  0.99995031   -0 00 15.7
 HV2181;SPC VA N     - 2,141,376.980 3,629,452.847   MT  0.99996330   +0 55 54.6
 HV2181;SPC VA N     - 7,025,500.98 11,907,629.88   sFT  0.99996330   +0 55 54.6
 HV2181;UTM  18      - 4,311,017.409   326,038.024   MT  0.99997266   -1 15 41.2
 HV2181
 HV2181!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2181!SPC MD       -   0.99999486  x   0.99995031  =   0.99994517
 HV2181!SPC VA N     -   0.99999486  x   0.99996330  =   0.99995816
 HV2181!UTM  18      -   0.99999486  x   0.99997266  =   0.99996752
 HV2181
 HV2181:                Primary Azimuth Mark                     Grid Az
 HV2181:SPC MD       -  N E 131 C 1960                           079 56 01.6
 HV2181:SPC VA N     -  N E 131 C 1960                           078 59 51.3
 HV2181:UTM  18      -  N E 131 C 1960                           081 11 27.1
 HV2181
 HV2181_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2603811017(NAD 83)
 HV2181
 HV2181|---------------------------------------------------------------------|
 HV2181| PID    Reference Object                     Distance      Geod. Az  |
 HV2181|                                                           dddmmss.s |
 HV2181| HV4533 N E 130 B ECC                       372.141 METERS 01140     |
 HV2181| HV4527 P O L                               360.370 METERS 01140     |
 HV2181| HV4162 N E 130 B 1960                      372.745 METERS 01140     |
 HV2181| HV7697 N E 131 C 1960                      APPROX. 0.7 KM 0795545.9 |
 HV2181| HV4154 N E 131 A 1960                      375.956 METERS 20650     |
 HV2181|---------------------------------------------------------------------|
 HV2181
 HV2181                          SUPERSEDED SURVEY CONTROL
 HV2181
 HV2181  NAD 83(1991)-  38 55 51.04159(N)    077 00 25.02326(W) AD(       ) 2
 HV2181  NAD 83(1986)-  38 55 51.04079(N)    077 00 25.03353(W) AD(       ) 2
 HV2181  NAD 27      -  38 55 50.64240(N)    077 00 26.11460(W) AD(       ) 2
 HV2181  NGVD 29              65.02   (m)          213.3    (f) LEVELING    3  
 HV2181  NGVD 29 (11/26/84)   65.024  (m)          213.33   (f) ADJUSTED    2 0
 HV2181
 HV2181.Superseded values are not recommended for survey control.
 HV2181
 HV2181.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2181.See file dsdata.pdf to determine how the superseded data were derived.
 HV2181
 HV2181_MARKER: DD = SURVEY DISK
 HV2181_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2181_SP_SET: MONUMENT
 HV2181_STAMPING: USCGS NO NE 131
 HV2181_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2181
 HV2181  HISTORY     - Date     Condition        Report By
 HV2181  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2181  HISTORY     - 1960     GOOD             MADHOP
 HV2181  HISTORY     - 1966     GOOD             LOCENG
 HV2181  HISTORY     - 1971     GOOD             NGS
 HV2181
 HV2181                          STATION DESCRIPTION
 HV2181
 HV2181'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2181'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2181'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.E. 131 SET IN
 HV2181'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2181'COVER WITH LID LABELED SURVEY.
 HV2181
 HV2181                          STATION RECOVERY (1960)
 HV2181
 HV2181'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2181'IN WASHINGTON DC.
 HV2181'LOCATED ON NORTH CAPITOL ST. BRIDGE WHERE IT CROSSES OVER
 HV2181'IRVING ST. N.W. ON THE EAST SIDE OF BRIDGE, 60.24 FT. EAST OF
 HV2181'CROSS CUT IN MANHOLE RIM IN CENTER OF BRIDGE, 27.06 FT. SOUTH OF
 HV2181'CORNER OF BRIDGE, 95.43 FT. NORTH OF CROSS CUT IN LAMP POST
 HV2181'BASE.  A STANDARD BRASS DISC SET IN TOP OF 12 IN. CONCRETE
 HV2181'MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID
 HV2181'LABELED SURVEY.
 HV2181
 HV2181                          STATION RECOVERY (1966)
 HV2181
 HV2181'RECOVERY NOTE BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (WST)
 HV2181'RECOVERED BY DELEUW CATHER.
 HV2181'
 HV2181'GOOD
 HV2181'
 HV2181'ONE TIE ON M.H. RIM VERY POOR SHAPE X NEEDS REPLACING
 HV2181
 HV2181                          STATION RECOVERY (1971)
 HV2181
 HV2181'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2181'THE STATION AND REFERENCE POINTS WERE RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2184 ***********************************************************************
 HV2184  DESIGNATION -  NE 132 B DCDHT
 HV2184  PID         -  HV2184
 HV2184  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2184  COUNTRY     -  US
 HV2184  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2184
 HV2184                         *CURRENT SURVEY CONTROL
 HV2184  ______________________________________________________________________
 HV2184* NAD 83(1993) POSITION- 38 54 38.11045(N) 077 00 31.94642(W)   ADJUSTED
 HV2184* NAVD 88 ORTHO HEIGHT -    20.940 (meters)       68.70  (feet) ADJUSTED
 HV2184  ______________________________________________________________________
 HV2184  GEOID HEIGHT    -        -32.085 (meters)                     GEOID18
 HV2184  LAPLACE CORR    -         -3.31  (seconds)                    DEFLEC18
 HV2184  DYNAMIC HEIGHT  -         20.929 (meters)       68.66  (feet) COMP
 HV2184  MODELED GRAVITY -    980,105.2   (mgal)                       NAVD 88
 HV2184
 HV2184  HORZ ORDER      -  SECOND
 HV2184  VERT ORDER      -  SECOND    CLASS 0
 HV2184
 HV2184.The horizontal coordinates were established by classical geodetic methods
 HV2184.and adjusted by the National Geodetic Survey in November 1994.
 HV2184
 HV2184.The orthometric height was determined by differential leveling and
 HV2184.adjusted by the NATIONAL GEODETIC SURVEY
 HV2184.in June 1991.
 HV2184
 HV2184.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2184.GEOID18 height accuracy estimate available here.
 HV2184
 HV2184.Click photographs - Photos may exist for this station.
 HV2184
 HV2184.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2184
 HV2184.The dynamic height is computed by dividing the NAVD 88
 HV2184.geopotential number by the normal gravity value computed on the
 HV2184.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2184.degrees latitude (g = 980.6199 gals.).
 HV2184
 HV2184.The modeled gravity was interpolated from observed gravity values.
 HV2184
 HV2184. The following values were computed from the NAD 83(1993) position.
 HV2184
 HV2184;                    North         East     Units Scale Factor Converg.
 HV2184;SPC MD       -   138,080.497   399,230.349   MT  0.99995003   -0 00 20.1
 HV2184;SPC MD       -   453,019.10  1,309,808.24   sFT  0.99995003   -0 00 20.1
 HV2184;SPC VA N     - 2,139,125.625 3,629,322.624   MT  0.99996144   +0 55 50.3
 HV2184;SPC VA N     - 7,018,114.65 11,907,202.64   sFT  0.99996144   +0 55 50.3
 HV2184;UTM  18      - 4,308,772.663   325,821.744   MT  0.99997359   -1 15 43.6
 HV2184
 HV2184!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2184!SPC MD       -   1.00000175  x   0.99995003  =   0.99995178
 HV2184!SPC VA N     -   1.00000175  x   0.99996144  =   0.99996319
 HV2184!UTM  18      -   1.00000175  x   0.99997359  =   0.99997534
 HV2184
 HV2184:                Primary Azimuth Mark                     Grid Az
 HV2184:SPC MD       -  NE 139 RESET                             114 58 46.8
 HV2184:SPC VA N     -  NE 139 RESET                             114 02 36.4
 HV2184:UTM  18      -  NE 139 RESET                             116 14 10.3
 HV2184
 HV2184_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2582108772(NAD 83)
 HV2184
 HV2184|---------------------------------------------------------------------|
 HV2184| PID    Reference Object                     Distance      Geod. Az  |
 HV2184|                                                           dddmmss.s |
 HV2184| HV2186 NE 139 RESET                        407.260 METERS 1145826.7 |
 HV2184| HV4151 N E 132 A 1960                      301.319 METERS 35907     |
 HV2184|---------------------------------------------------------------------|
 HV2184
 HV2184                          SUPERSEDED SURVEY CONTROL
 HV2184
 HV2184  NAD 83(1991)-  38 54 38.10940(N)    077 00 31.94756(W) AD(       ) 2
 HV2184  NAD 83(1986)-  38 54 38.10860(N)    077 00 31.95813(W) AD(       ) 2
 HV2184  NAD 27      -  38 54 37.70900(N)    077 00 33.04000(W) AD(       ) 2
 HV2184  NGVD 29              21.17   (m)           69.5    (f) LEVELING    3  
 HV2184  NGVD 29 (11/26/84)   21.174  (m)           69.47   (f) ADJUSTED    2 0
 HV2184
 HV2184.Superseded values are not recommended for survey control.
 HV2184
 HV2184.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2184.See file dsdata.pdf to determine how the superseded data were derived.
 HV2184
 HV2184_MARKER: DD = SURVEY DISK
 HV2184_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2184_SP_SET: CONCRETE ISLAND
 HV2184_STAMPING: USCGS NO NE 132 B
 HV2184_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2184
 HV2184  HISTORY     - Date     Condition        Report By
 HV2184  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2184  HISTORY     - 1960     GOOD             MADHOP
 HV2184  HISTORY     - 1971     GOOD             NGS
 HV2184
 HV2184                          STATION DESCRIPTION
 HV2184
 HV2184'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2184'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2184'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.E. 132-B
 HV2184'GROUTED IN CONCRETE CONCRETE ISLAND.
 HV2184
 HV2184                          STATION RECOVERY (1960)
 HV2184
 HV2184'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2184'IN WASHINGTON DC.
 HV2184'LOCATED AT INTERSECTION OF FLORIDA AVE. N.E. AND NORTH CAPITOL
 HV2184'ST. GROUTED IN CONCRETE ISLAND AT ESSO GAS STATION.  17.52 FT.
 HV2184'NORTHWEST OF CROSS CUT IN BOLT OF ESSO SIGN, AND 8.73 FT. WEST
 HV2184'OF CROSSCUT IN MANHOLE RIM, AND 12.15 FT. SOUTHEAST OF CROSS CUT
 HV2184'IN MANHOLE RIM.  A STANDARD BRASS DISC GROUTED IN CONCRETE ISLAND.
 HV2184
 HV2184                          STATION RECOVERY (1971)
 HV2184
 HV2184'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2184'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE
 HV2184'ORIGINAL DESCRIPTION IS ADEQUATE.
 HV2184'
 HV2184'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2184'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2188 ***********************************************************************
 HV2188  DESIGNATION -  NE 134 A
 HV2188  PID         -  HV2188
 HV2188  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2188  COUNTRY     -  US
 HV2188  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2188
 HV2188                         *CURRENT SURVEY CONTROL
 HV2188  ______________________________________________________________________
 HV2188* NAD 83(1993) POSITION- 38 53 47.54066(N) 077 00 24.11644(W)   ADJUSTED
 HV2188* NAVD 88 ORTHO HEIGHT -    17.249 (meters)       56.59  (feet) ADJUSTED
 HV2188  ______________________________________________________________________
 HV2188  GEOID HEIGHT    -        -32.118 (meters)                     GEOID18
 HV2188  LAPLACE CORR    -         -3.45  (seconds)                    DEFLEC18
 HV2188  DYNAMIC HEIGHT  -         17.240 (meters)       56.56  (feet) COMP
 HV2188  MODELED GRAVITY -    980,102.8   (mgal)                       NAVD 88
 HV2188
 HV2188  HORZ ORDER      -  SECOND
 HV2188  VERT ORDER      -  FIRST     CLASS II
 HV2188
 HV2188.The horizontal coordinates were established by classical geodetic methods
 HV2188.and adjusted by the National Geodetic Survey in November 1994.
 HV2188
 HV2188.The orthometric height was determined by differential leveling and
 HV2188.adjusted by the NATIONAL GEODETIC SURVEY
 HV2188.in October 2012.
 HV2188
 HV2188.No vertical observational check was made to the station.
 HV2188
 HV2188.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2188.GEOID18 height accuracy estimate available here.
 HV2188
 HV2188.Click photographs - Photos may exist for this station.
 HV2188
 HV2188.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2188
 HV2188.The dynamic height is computed by dividing the NAVD 88
 HV2188.geopotential number by the normal gravity value computed on the
 HV2188.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2188.degrees latitude (g = 980.6199 gals.).
 HV2188
 HV2188.The modeled gravity was interpolated from observed gravity values.
 HV2188
 HV2188. The following values were computed from the NAD 83(1993) position.
 HV2188
 HV2188;                    North         East     Units Scale Factor Converg.
 HV2188;SPC MD       -   136,521.132   399,418.874   MT  0.99994991   -0 00 15.1
 HV2188;SPC MD       -   447,903.08  1,310,426.76   sFT  0.99994991   -0 00 15.1
 HV2188;SPC VA N     - 2,137,569.532 3,629,536.605   MT  0.99996021   +0 55 55.2
 HV2188;SPC VA N     - 7,013,009.37 11,907,904.68   sFT  0.99996021   +0 55 55.2
 HV2188;UTM  18      - 4,307,209.503   325,976.037   MT  0.99997292   -1 15 37.3
 HV2188
 HV2188!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2188!SPC MD       -   1.00000233  x   0.99994991  =   0.99995224
 HV2188!SPC VA N     -   1.00000233  x   0.99996021  =   0.99996254
 HV2188!UTM  18      -   1.00000233  x   0.99997292  =   0.99997525
 HV2188
 HV2188:                Primary Azimuth Mark                     Grid Az
 HV2188:SPC MD       -  CAPITOL STATUE OF FREEDOM HEAD           195 19 38.4
 HV2188:SPC VA N     -  CAPITOL STATUE OF FREEDOM HEAD           194 23 28.1
 HV2188:UTM  18      -  CAPITOL STATUE OF FREEDOM HEAD           196 35 00.6
 HV2188
 HV2188_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2597607209(NAD 83)
 HV2188
 HV2188|---------------------------------------------------------------------|
 HV2188| PID    Reference Object                     Distance      Geod. Az  |
 HV2188|                                                           dddmmss.s |
 HV2188| HV4150 CAPITOL STATUE OF FREEDOM HEAD      APPROX. 0.8 KM 1951923.3 |
 HV2188| HV4499 LA D                                307.009 METERS 22819     |
 HV2188|---------------------------------------------------------------------|
 HV2188
 HV2188                          SUPERSEDED SURVEY CONTROL
 HV2188
 HV2188  NAD 83(1991)-  38 53 47.53947(N)    077 00 24.11764(W) AD(       ) 2
 HV2188  NAD 83(1986)-  38 53 47.53886(N)    077 00 24.12833(W) AD(       ) 2
 HV2188  NAD 27      -  38 53 47.13810(N)    077 00 25.21000(W) AD(       ) 2
 HV2188  NAVD 88 (06/15/91)   17.271  (m)           56.66   (f) SUPERSEDED  1 1
 HV2188  NGVD 29              17.51   (m)           57.4    (f) LEVELING    3  
 HV2188  NGVD 29 (11/26/84)   17.505  (m)           57.43   (f) ADJUSTED    1 1
 HV2188
 HV2188.Superseded values are not recommended for survey control.
 HV2188
 HV2188.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2188.See file dsdata.pdf to determine how the superseded data were derived.
 HV2188
 HV2188_MARKER: DD = SURVEY DISK
 HV2188_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV2188_SP_SET: CURB
 HV2188_STAMPING: U.S.C.&G.S. NO. NE 134 A
 HV2188_MARK LOGO: DCDHT
 HV2188_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2188_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV2188+SATELLITE: SATELLITE OBSERVATIONS - March 16, 2020
 HV2188
 HV2188  HISTORY     - Date     Condition        Report By
 HV2188  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2188  HISTORY     - 1960     GOOD             MADHOP
 HV2188  HISTORY     - 1971     GOOD             NGS
 HV2188  HISTORY     - 20080320 GOOD             NGS
 HV2188  HISTORY     - 20090319 GOOD             GEOCAC
 HV2188  HISTORY     - 20100109 GOOD             GEOCAC
 HV2188  HISTORY     - 20120301 GOOD             NGS
 HV2188  HISTORY     - 20180716 GOOD             USPSQD
 HV2188  HISTORY     - 20200316 GOOD             MDSHA
 HV2188
 HV2188                          STATION DESCRIPTION
 HV2188
 HV2188'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2188'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2188'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.E. 134-A
 HV2188'GROUTED IN CONCRETE CURB.
 HV2188
 HV2188                          STATION RECOVERY (1960)
 HV2188
 HV2188'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2188'IN WASHINGTON DC.
 HV2188'LOCATED ON THE STEPS OF COLUMBUS MEMORIAL SOUTH OF UNION STATION.
 HV2188'44.44 FT. SOUTHEAST OF CROSS CUT IN LAMP POST BASE, AND 36.98 FT.
 HV2188'NORTHWEST OF THE CENTER OF THE WEST SIDE OF THE HORSESHOE CURVE
 HV2188'(OF THE MEMORIAL), AND 13.10 FT. WEST OF THE NORTHWEST CORNER OF
 HV2188'THE MEMORIAL.  A STANDARD BRASS DISC GROUTED IN CONCRETE CURB.
 HV2188
 HV2188                          STATION RECOVERY (1971)
 HV2188
 HV2188'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2188'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE ORIGINAL
 HV2188'DESCRIPTION IS ADEQUATE.
 HV2188'
 HV2188'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2188'IN DISTRICT OF COLUMBIA.
 HV2188
 HV2188                          STATION RECOVERY (2008)
 HV2188
 HV2188'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DRD)
 HV2188'RECOVERED IN GOOD CONDITION.
 HV2188
 HV2188                          STATION RECOVERY (2009)
 HV2188
 HV2188'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV2188'RECOVERED IN GOOD CONDITION.
 HV2188
 HV2188                          STATION RECOVERY (2010)
 HV2188
 HV2188'RECOVERY NOTE BY GEOCACHING 2010 (MFM)
 HV2188'RECOVERED IN GOOD CONDITION.
 HV2188
 HV2188                          STATION RECOVERY (2012)
 HV2188
 HV2188'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV2188'RECOVERED AS DESCRIBED.
 HV2188
 HV2188                          STATION RECOVERY (2018)
 HV2188
 HV2188'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV2188'RECOVERED IN GOOD CONDITION.
 HV2188
 HV2188                          STATION RECOVERY (2020)
 HV2188
 HV2188'RECOVERY NOTE BY MARYLAND DOT HIGHWAY ADMINISTRATION 2020 (JML)
 HV2188'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1493 ***********************************************************************
 HV1493  DESIGNATION -  NE 135
 HV1493  PID         -  HV1493
 HV1493  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1493  COUNTRY     -  US
 HV1493  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1493
 HV1493                         *CURRENT SURVEY CONTROL
 HV1493  ______________________________________________________________________
 HV1493* NAD 83(1993) POSITION- 38 57 00.06989(N) 076 59 35.87599(W)   ADJUSTED
 HV1493* NAVD 88 ORTHO HEIGHT -    28.756 (meters)       94.34  (feet) ADJUSTED
 HV1493  ______________________________________________________________________
 HV1493  GEOID HEIGHT    -        -32.051 (meters)                     GEOID18
 HV1493  LAPLACE CORR    -         -3.43  (seconds)                    DEFLEC18
 HV1493  DYNAMIC HEIGHT  -         28.742 (meters)       94.30  (feet) COMP
 HV1493  MODELED GRAVITY -    980,111.7   (mgal)                       NAVD 88
 HV1493
 HV1493  HORZ ORDER      -  SECOND
 HV1493  VERT ORDER      -  SECOND    CLASS 0
 HV1493
 HV1493.The horizontal coordinates were established by classical geodetic methods
 HV1493.and adjusted by the National Geodetic Survey in November 1994.
 HV1493
 HV1493.The orthometric height was determined by differential leveling and
 HV1493.adjusted by the NATIONAL GEODETIC SURVEY
 HV1493.in June 1991.
 HV1493
 HV1493.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1493.GEOID18 height accuracy estimate available here.
 HV1493
 HV1493.Click photographs - Photos may exist for this station.
 HV1493
 HV1493.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1493
 HV1493.The dynamic height is computed by dividing the NAVD 88
 HV1493.geopotential number by the normal gravity value computed on the
 HV1493.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1493.degrees latitude (g = 980.6199 gals.).
 HV1493
 HV1493.The modeled gravity was interpolated from observed gravity values.
 HV1493
 HV1493. The following values were computed from the NAD 83(1993) position.
 HV1493
 HV1493;                    North         East     Units Scale Factor Converg.
 HV1493;SPC MD       -   142,457.904   400,580.873   MT  0.99995068   +0 00 15.1
 HV1493;SPC MD       -   467,380.64  1,314,239.08   sFT  0.99995068   +0 00 15.1
 HV1493;SPC VA N     - 2,143,524.571 3,630,601.464   MT  0.99996519   +0 56 25.3
 HV1493;SPC VA N     - 7,032,546.86 11,911,398.30   sFT  0.99996519   +0 56 25.3
 HV1493;UTM  18      - 4,313,119.476   327,268.004   MT  0.99996740   -1 15 12.2
 HV1493
 HV1493!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1493!SPC MD       -   1.00000052  x   0.99995068  =   0.99995120
 HV1493!SPC VA N     -   1.00000052  x   0.99996519  =   0.99996571
 HV1493!UTM  18      -   1.00000052  x   0.99996740  =   0.99996792
 HV1493
 HV1493:                Primary Azimuth Mark                     Grid Az
 HV1493:SPC MD       -  NE 129 F MADHOP                          313 43 09.5
 HV1493:SPC VA N     -  NE 129 F MADHOP                          312 46 59.3
 HV1493:UTM  18      -  NE 129 F MADHOP                          314 58 36.8
 HV1493
 HV1493_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2726813119(NAD 83)
 HV1493
 HV1493|---------------------------------------------------------------------|
 HV1493| PID    Reference Object                     Distance      Geod. Az  |
 HV1493|                                                           dddmmss.s |
 HV1493| HV7699 N E 135 A 1960                      APPROX. 0.5 KM 1350747.3 |
 HV1493| CX3515 NE 135 AZ MK                                       3111331.8 |
 HV1493| HV2180 NE 129 F MADHOP                     APPROX. 1.0 KM 3134324.6 |
 HV1493|---------------------------------------------------------------------|
 HV1493
 HV1493                          SUPERSEDED SURVEY CONTROL
 HV1493
 HV1493  NAD 83(1991)-  38 57 00.06885(N)    076 59 35.87693(W) AD(       ) 2
 HV1493  NAD 83(1986)-  38 57 00.06792(N)    076 59 35.88693(W) AD(       ) 2
 HV1493  NAD 27      -  38 56 59.67240(N)    076 59 36.96570(W) AD(       ) 2
 HV1493  NGVD 29              28.99   (m)           95.1    (f) LEVELING    3  
 HV1493  NGVD 29 (11/26/84)   28.989  (m)           95.11   (f) ADJUSTED    2 0
 HV1493
 HV1493.Superseded values are not recommended for survey control.
 HV1493
 HV1493.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1493.See file dsdata.pdf to determine how the superseded data were derived.
 HV1493
 HV1493_MARKER: DD = SURVEY DISK
 HV1493_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1493_STAMPING: USCGS NO NE 135
 HV1493_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1493+STABILITY: SURFACE MOTION
 HV1493
 HV1493  HISTORY     - Date     Condition        Report By
 HV1493  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1493  HISTORY     - 1960     GOOD             MADHOP
 HV1493  HISTORY     - 1971     GOOD             NGS
 HV1493
 HV1493                          STATION DESCRIPTION
 HV1493
 HV1493'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1493'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1493'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.E. 135 SET IN
 HV1493'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1493'COVER WITH LID LABELED SURVEY.
 HV1493'
 HV1493'AZIMUTH MARK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1493'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NE 135-AZ. SET
 HV1493'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1493'COVER WITH LID LABELED SURVEY.
 HV1493'
 HV1493'NO GEOGRAPHIC POSITION.
 HV1493
 HV1493                          STATION RECOVERY (1960)
 HV1493
 HV1493'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1493'IN DC.
 HV1493'LOCATED ON SOUTH DAKOTA AVE. N.E. NEAR INTERSECTION OF 10TH ST.
 HV1493'N.E. AND SOUTH DAKOTA.  32.10 FT NORTHWEST OF CROSS CUT IN MANHOLE
 HV1493'RIM IN ROADWAY OF 10TH ST., AND 48.35 FT SOUTHWEST OF SOUTHWEST
 HV1493'CORNER OF BUILDING 5001, AND SOUTH OF CROSS CUT IN MANHOLE RIM
 HV1493'ADJACENT TO S. DAKOTA AVE.  A STANDARD BRASS DISC SET IN TOP OF 12
 HV1493'IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH
 HV1493'LID LABELED SURVEY.
 HV1493
 HV1493                          STATION RECOVERY (1971)
 HV1493
 HV1493'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1493'STATION WAS RECOVERED IN GOOD CONDITION.  ORIGINAL DESCRIPTION
 HV1493'IS ADEQUATE, WITH THE FOLLOWING ADDITIONS--STATION IS 5.7 FEET
 HV1493'SOUTH OF CROSS CUT IN RIM OF MANHOLE COVER TO NORTH, 2.8 FEET
 HV1493'SOUTH OF CENTER OF A TRAFFIC SIGNAL POLE, AND IS BENEATH A SQUARE
 HV1493'MANHOLE COVER.
 HV1493'
 HV1493'AZIMUTH MARK WAS ALSO RECOVERED IN GOOD CONDITION AS DESCRIBED.
 HV1493'
 HV1493'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV1493'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1494 ***********************************************************************
 HV1494  DESIGNATION -  NE 136
 HV1494  PID         -  HV1494
 HV1494  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1494  COUNTRY     -  US
 HV1494  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1494
 HV1494                         *CURRENT SURVEY CONTROL
 HV1494  ______________________________________________________________________
 HV1494* NAD 83(1993) POSITION- 38 56 34.07016(N) 076 59 01.35420(W)   ADJUSTED
 HV1494* NAVD 88 ORTHO HEIGHT -    26.266 (meters)       86.17  (feet) ADJUSTED
 HV1494  ______________________________________________________________________
 HV1494  GEOID HEIGHT    -        -32.076 (meters)                     GEOID18
 HV1494  LAPLACE CORR    -         -3.95  (seconds)                    DEFLEC18
 HV1494  DYNAMIC HEIGHT  -         26.252 (meters)       86.13  (feet) COMP
 HV1494  MODELED GRAVITY -    980,110.1   (mgal)                       NAVD 88
 HV1494
 HV1494  HORZ ORDER      -  SECOND
 HV1494  VERT ORDER      -  SECOND    CLASS 0
 HV1494
 HV1494.The horizontal coordinates were established by classical geodetic methods
 HV1494.and adjusted by the National Geodetic Survey in November 1994.
 HV1494
 HV1494.The orthometric height was determined by differential leveling and
 HV1494.adjusted by the NATIONAL GEODETIC SURVEY
 HV1494.in June 1991.
 HV1494
 HV1494.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1494.GEOID18 height accuracy estimate available here.
 HV1494
 HV1494.Click photographs - Photos may exist for this station.
 HV1494
 HV1494.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1494
 HV1494.The dynamic height is computed by dividing the NAVD 88
 HV1494.geopotential number by the normal gravity value computed on the
 HV1494.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1494.degrees latitude (g = 980.6199 gals.).
 HV1494
 HV1494.The modeled gravity was interpolated from observed gravity values.
 HV1494
 HV1494. The following values were computed from the NAD 83(1993) position.
 HV1494
 HV1494;                    North         East     Units Scale Factor Converg.
 HV1494;SPC MD       -   141,656.286   401,412.253   MT  0.99995053   +0 00 36.8
 HV1494;SPC MD       -   464,750.66  1,316,966.70   sFT  0.99995053   +0 00 36.8
 HV1494;SPC VA N     - 2,142,736.631 3,631,445.842   MT  0.99996446   +0 56 46.8
 HV1494;SPC VA N     - 7,029,961.76 11,914,168.57   sFT  0.99996446   +0 56 46.8
 HV1494;UTM  18      - 4,312,299.793   328,081.604   MT  0.99996395   -1 14 49.8
 HV1494
 HV1494!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1494!SPC MD       -   1.00000091  x   0.99995053  =   0.99995144
 HV1494!SPC VA N     -   1.00000091  x   0.99996446  =   0.99996537
 HV1494!UTM  18      -   1.00000091  x   0.99996395  =   0.99996486
 HV1494
 HV1494:                Primary Azimuth Mark                     Grid Az
 HV1494:SPC MD       -  NE 136 AZ MK                             138 05 39.3
 HV1494:SPC VA N     -  NE 136 AZ MK                             137 09 29.3
 HV1494:UTM  18      -  NE 136 AZ MK                             139 21 05.9
 HV1494
 HV1494_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2808112299(NAD 83)
 HV1494
 HV1494|---------------------------------------------------------------------|
 HV1494| PID    Reference Object                     Distance      Geod. Az  |
 HV1494|                                                           dddmmss.s |
 HV1494| CX3516 NE 136 AZ MK                                       1380616.1 |
 HV1494| HV7688 N E 136 A 1960                      352.326 METERS 14041     |
 HV1494| HV7704 N E 135 B 1960                      410.242 METERS 3131201.5 |
 HV1494|---------------------------------------------------------------------|
 HV1494
 HV1494                          SUPERSEDED SURVEY CONTROL
 HV1494
 HV1494  NAD 83(1991)-  38 56 34.06908(N)    076 59 01.35515(W) AD(       ) 2
 HV1494  NAD 83(1986)-  38 56 34.06808(N)    076 59 01.36527(W) AD(       ) 2
 HV1494  NAD 27      -  38 56 33.67070(N)    076 59 02.44730(W) AD(       ) 2
 HV1494  NGVD 29              26.50   (m)           86.9    (f) LEVELING    3  
 HV1494  NGVD 29 (11/26/84)   26.498  (m)           86.94   (f) ADJUSTED    2 0
 HV1494
 HV1494.Superseded values are not recommended for survey control.
 HV1494
 HV1494.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1494.See file dsdata.pdf to determine how the superseded data were derived.
 HV1494
 HV1494_MARKER: DD = SURVEY DISK
 HV1494_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1494_SP_SET: MONUMENT
 HV1494_STAMPING: USCGS NO NE 136
 HV1494_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1494
 HV1494  HISTORY     - Date     Condition        Report By
 HV1494  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1494  HISTORY     - 1960     GOOD             MADHOP
 HV1494  HISTORY     - 1971     GOOD             NGS
 HV1494
 HV1494                          STATION DESCRIPTION
 HV1494
 HV1494'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1494'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1494'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO NE 136 SET IN
 HV1494'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1494'COVER WITH LID LABELED SURVEY.
 HV1494'
 HV1494'AZIMUTH MARK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1494'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NE 136-AZ. SET
 HV1494'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1494'COVER WITH LID LABELED SURVEY.
 HV1494
 HV1494                          STATION RECOVERY (1960)
 HV1494
 HV1494'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1494'IN DC.
 HV1494'LOCATED AT INTERSECTION OF SOUTH DAKOTA AVE. N.E. AND 16TH ST.
 HV1494'N.E. ON THE SOUTHWEST CORNER OF INTERSECTION.  30.52 FT
 HV1494'SOUTHWEST OF CROSS CUT IN RIM OF MANHOLE ON ROADWAY OF INTERSECTION,
 HV1494'AND 2.56 FT SOUTHEAST OF CROSS CUT IN MANHOLE RIM ADJACENT TO
 HV1494'S. DAKOTA AVE, AND 8.15 FT NORTH OF NAIL AND WASHER IN P.E.P.C.D.
 HV1494'POLE 22064.  A STANDARD BRASS DISC SET IN TOP OF 12 IN CON.
 HV1494'MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID LABELED
 HV1494'SURVEY.
 HV1494
 HV1494                          STATION RECOVERY (1971)
 HV1494
 HV1494'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1494'STATION WAS RECOVERED IN GOOD CONDITION AS PREVIOUSLY
 HV1494'DESCRIBED.  ORIGINAL DESCRIPTION IS ADEQUATE.  STATION IS
 HV1494'BENEATH A SQUARE MANHOLE COVER.
 HV1494'
 HV1494'AZIMUTH MARK WAS ALSO FOUND IN GOOD CONDITION AS DESCRIBED.
 HV1494'
 HV1494'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV1494'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1486 ***********************************************************************
 HV1486  DESIGNATION -  NE 136 D DCDHT
 HV1486  PID         -  HV1486
 HV1486  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1486  COUNTRY     -  US
 HV1486  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1486
 HV1486                         *CURRENT SURVEY CONTROL
 HV1486  ______________________________________________________________________
 HV1486* NAD 83(1993) POSITION- 38 56 02.45739(N) 076 58 28.20910(W)   ADJUSTED
 HV1486* NAVD 88 ORTHO HEIGHT -    28.587 (meters)       93.79  (feet) ADJUSTED
 HV1486  ______________________________________________________________________
 HV1486  GEOID HEIGHT    -        -32.109 (meters)                     GEOID18
 HV1486  LAPLACE CORR    -         -4.41  (seconds)                    DEFLEC18
 HV1486  DYNAMIC HEIGHT  -         28.572 (meters)       93.74  (feet) COMP
 HV1486  MODELED GRAVITY -    980,107.6   (mgal)                       NAVD 88
 HV1486
 HV1486  HORZ ORDER      -  SECOND
 HV1486  VERT ORDER      -  SECOND    CLASS 0
 HV1486
 HV1486.The horizontal coordinates were established by classical geodetic methods
 HV1486.and adjusted by the National Geodetic Survey in November 1994.
 HV1486
 HV1486.The orthometric height was determined by differential leveling and
 HV1486.adjusted by the NATIONAL GEODETIC SURVEY
 HV1486.in June 1991.
 HV1486
 HV1486.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1486.GEOID18 height accuracy estimate available here.
 HV1486
 HV1486.Click photographs - Photos may exist for this station.
 HV1486
 HV1486.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1486
 HV1486.The dynamic height is computed by dividing the NAVD 88
 HV1486.geopotential number by the normal gravity value computed on the
 HV1486.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1486.degrees latitude (g = 980.6199 gals.).
 HV1486
 HV1486.The modeled gravity was interpolated from observed gravity values.
 HV1486
 HV1486. The following values were computed from the NAD 83(1993) position.
 HV1486
 HV1486;                    North         East     Units Scale Factor Converg.
 HV1486;SPC MD       -   140,681.664   402,210.695   MT  0.99995036   +0 00 57.6
 HV1486;SPC MD       -   461,553.09  1,319,586.26   sFT  0.99995036   +0 00 57.6
 HV1486;SPC VA N     - 2,141,775.171 3,632,260.111   MT  0.99996361   +0 57 07.5
 HV1486;SPC VA N     - 7,026,807.37 11,916,840.05   sFT  0.99996361   +0 57 07.5
 HV1486;UTM  18      - 4,311,307.876   328,858.478   MT  0.99996067   -1 14 28.1
 HV1486
 HV1486!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1486!SPC MD       -   1.00000055  x   0.99995036  =   0.99995091
 HV1486!SPC VA N     -   1.00000055  x   0.99996361  =   0.99996416
 HV1486!UTM  18      -   1.00000055  x   0.99996067  =   0.99996122
 HV1486
 HV1486:                Primary Azimuth Mark                     Grid Az
 HV1486:SPC MD       -  N E 136 C 1960                           320 49 31.1
 HV1486:SPC VA N     -  N E 136 C 1960                           319 53 21.2
 HV1486:UTM  18      -  N E 136 C 1960                           322 04 56.8
 HV1486
 HV1486_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2885811307(NAD 83)
 HV1486
 HV1486|---------------------------------------------------------------------|
 HV1486| PID    Reference Object                     Distance      Geod. Az  |
 HV1486|                                                           dddmmss.s |
 HV1486| HV1487 NE 137                              415.212 METERS 1390724.6 |
 HV1486| HV7724 N E 138 F 1960                      196.894 METERS 27435     |
 HV1486| HV7720 N E 136 C 1960                      410.273 METERS 3205028.7 |
 HV1486|---------------------------------------------------------------------|
 HV1486
 HV1486                          SUPERSEDED SURVEY CONTROL
 HV1486
 HV1486  NAD 83(1991)-  38 56 02.45629(N)    076 58 28.21006(W) AD(       ) 2
 HV1486  NAD 83(1986)-  38 56 02.45523(N)    076 58 28.22031(W) AD(       ) 2
 HV1486  NAD 27      -  38 56 02.05720(N)    076 58 29.30580(W) AD(       ) 2
 HV1486  NGVD 29              28.82   (m)           94.6    (f) LEVELING    3  
 HV1486  NGVD 29 (11/26/84)   28.820  (m)           94.55   (f) ADJUSTED    2 0
 HV1486
 HV1486.Superseded values are not recommended for survey control.
 HV1486
 HV1486.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1486.See file dsdata.pdf to determine how the superseded data were derived.
 HV1486
 HV1486_MARKER: DD = SURVEY DISK
 HV1486_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1486_SP_SET: CONC CURB
 HV1486_STAMPING: USCGS NO NE 136 D
 HV1486_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1486
 HV1486  HISTORY     - Date     Condition        Report By
 HV1486  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1486  HISTORY     - 1960     GOOD             MADHOP
 HV1486  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV1486
 HV1486                          STATION DESCRIPTION
 HV1486
 HV1486'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1486'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1486'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.E, 136-D
 HV1486'GROUTED IN CONCRETE CURB.
 HV1486
 HV1486                          STATION RECOVERY (1960)
 HV1486
 HV1486'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1486'IN DC.
 HV1486'LOCATED ON DAKOTA AVE. N.E. BETWEEN NEWTON ST. N.E. AND 22 ND ST.
 HV1486'N.E. 13.43 FT SOUTHEAST OF NORTHWEST CORNER OF STONE WALL IN
 HV1486'FRONT OF BUILDING 3528, AND 27.13 FT SOUTHEAST OF CROSS CUT IN
 HV1486'MANHOLE RIM IN ROADWAY OF INTERSECTION, AND 33.47 FT SOUTH OF
 HV1486'CROSS CUT IN MANHOLE RIM IN ROADWAY OF INTERSECTION, AND 1.30 FT
 HV1486'NORTHWEST OF NORTHWEST CORNER OF CATCH BASIN ON DAKOTA AVE.
 HV1486'A STANDARD BRASS DISC GROUTED IN TOP OF CONCRETE CURB.
 HV1486
 HV1486                          STATION RECOVERY (1971)
 HV1486
 HV1486'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1486'STATION WAS NOT FOUND.  IT IS BELIEVED IT WAS DESTROYED WHEN A
 HV1486'NEW CURB WAS BUILT.
 HV1486'
 HV1486'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV1486'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1487 ***********************************************************************
 HV1487  DESIGNATION -  NE 137
 HV1487  PID         -  HV1487
 HV1487  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1487  COUNTRY     -  US
 HV1487  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1487
 HV1487                         *CURRENT SURVEY CONTROL
 HV1487  ______________________________________________________________________
 HV1487* NAD 83(1993) POSITION- 38 55 52.27636(N) 076 58 16.92764(W)   ADJUSTED
 HV1487* NAVD 88 ORTHO HEIGHT -    45.785 (meters)      150.21  (feet) ADJUSTED
 HV1487  ______________________________________________________________________
 HV1487  GEOID HEIGHT    -        -32.121 (meters)                     GEOID18
 HV1487  LAPLACE CORR    -         -4.52  (seconds)                    DEFLEC18
 HV1487  DYNAMIC HEIGHT  -         45.761 (meters)      150.13  (feet) COMP
 HV1487  MODELED GRAVITY -    980,106.5   (mgal)                       NAVD 88
 HV1487
 HV1487  HORZ ORDER      -  SECOND
 HV1487  VERT ORDER      -  SECOND    CLASS 0
 HV1487
 HV1487.The horizontal coordinates were established by classical geodetic methods
 HV1487.and adjusted by the National Geodetic Survey in November 1994.
 HV1487
 HV1487.The orthometric height was determined by differential leveling and
 HV1487.adjusted by the NATIONAL GEODETIC SURVEY
 HV1487.in June 1991.
 HV1487
 HV1487.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1487.GEOID18 height accuracy estimate available here.
 HV1487
 HV1487.Click photographs - Photos may exist for this station.
 HV1487
 HV1487.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1487
 HV1487.The dynamic height is computed by dividing the NAVD 88
 HV1487.geopotential number by the normal gravity value computed on the
 HV1487.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1487.degrees latitude (g = 980.6199 gals.).
 HV1487
 HV1487.The modeled gravity was interpolated from observed gravity values.
 HV1487
 HV1487. The following values were computed from the NAD 83(1993) position.
 HV1487
 HV1487;                    North         East     Units Scale Factor Converg.
 HV1487;SPC MD       -   140,367.805   402,482.496   MT  0.99995031   +0 01 04.7
 HV1487;SPC MD       -   460,523.37  1,320,477.99   sFT  0.99995031   +0 01 04.7
 HV1487;SPC VA N     - 2,141,465.790 3,632,537.007   MT  0.99996334   +0 57 14.6
 HV1487;SPC VA N     - 7,025,792.35 11,917,748.50   sFT  0.99996334   +0 57 14.6
 HV1487;UTM  18      - 4,310,988.126   329,123.331   MT  0.99995955   -1 14 20.7
 HV1487
 HV1487!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1487!SPC MD       -   0.99999786  x   0.99995031  =   0.99994817
 HV1487!SPC VA N     -   0.99999786  x   0.99996334  =   0.99996120
 HV1487!UTM  18      -   0.99999786  x   0.99995955  =   0.99995741
 HV1487
 HV1487:                Primary Azimuth Mark                     Grid Az
 HV1487:SPC MD       -  NE 136 D DCDHT                           319 06 27.0
 HV1487:SPC VA N     -  NE 136 D DCDHT                           318 10 17.1
 HV1487:UTM  18      -  NE 136 D DCDHT                           320 21 52.4
 HV1487
 HV1487_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2912310988(NAD 83)
 HV1487
 HV1487|---------------------------------------------------------------------|
 HV1487| PID    Reference Object                     Distance      Geod. Az  |
 HV1487|                                                           dddmmss.s |
 HV1487| HV7734 N E 137 A 1960                      246.654 METERS 14021     |
 HV1487| HV1486 NE 136 D DCDHT                      415.212 METERS 3190731.7 |
 HV1487| CX3517 NE 137 AZ MK                                       3205417.2 |
 HV1487|---------------------------------------------------------------------|
 HV1487
 HV1487                          SUPERSEDED SURVEY CONTROL
 HV1487
 HV1487  NAD 83(1991)-  38 55 52.27525(N)    076 58 16.92861(W) AD(       ) 2
 HV1487  NAD 83(1986)-  38 55 52.27420(N)    076 58 16.93889(W) AD(       ) 2
 HV1487  NAD 27      -  38 55 51.87590(N)    076 58 18.02540(W) AD(       ) 2
 HV1487  NGVD 29              46.02   (m)          151.0    (f) LEVELING    3  
 HV1487  NGVD 29 (11/26/84)   46.018  (m)          150.98   (f) ADJUSTED    2 0
 HV1487
 HV1487.Superseded values are not recommended for survey control.
 HV1487
 HV1487.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1487.See file dsdata.pdf to determine how the superseded data were derived.
 HV1487
 HV1487_MARKER: DD = SURVEY DISK
 HV1487_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1487_STAMPING: USCGS NO NE 137
 HV1487_MARK LOGO: DCDHT
 HV1487_PROJECTION: FLUSH
 HV1487_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1487+STABILITY: SURFACE MOTION
 HV1487
 HV1487  HISTORY     - Date     Condition        Report By
 HV1487  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1487  HISTORY     - 1960     GOOD             MADHOP
 HV1487  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV1487
 HV1487                          STATION DESCRIPTION
 HV1487
 HV1487'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1487'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1487'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. N.E. 137 SET
 HV1487'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV1487'MANHOLE COVER WITH LID LABELED SURVEY.
 HV1487'
 HV1487'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1487'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NE 137-AZ. SET
 HV1487'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV1487'MANHOLE COVER WITH LID LABELED SURVEY.
 HV1487'
 HV1487'NO GEOGRAPHIC POSITION.
 HV1487
 HV1487                          STATION RECOVERY (1960)
 HV1487
 HV1487'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1487'IN DC.
 HV1487'LOCATED NEAR INTERSECTION OF RHODE ISLAND AVE. N.E. AND SOUTH
 HV1487'DAKOTA AVE. N.E. ADJACENT TO TOURIST HOUSE.  32.25 FT SOUTHEAST
 HV1487'OF CROSS CUT IN MANHOLE RIM ON ROADWAY OF INTERSECTION, AND
 HV1487'23.70 FT SOUTH OF CROSS CUT IN MANHOLE RIM ON ROADWAY OF RHODE ISLAND
 HV1487'AVE., AND 22.67 FT NORTHEAST OF CROSS CUT IN MANHOLE RIM ON ROADWAY OF
 HV1487'SOUTH DAKOTA AVE. N.E.  A STANDARD BRASS DISC SET IN TOP OF 12 IN
 HV1487'CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH
 HV1487'LID LABELED SURVEY.
 HV1487
 HV1487                          STATION RECOVERY (1971)
 HV1487
 HV1487'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1487'STATION WAS DESTROYED WHEN STREET WAS WIDENED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1488 ***********************************************************************
 HV1488  DESIGNATION -  NE 137 C MADHOP
 HV1488  PID         -  HV1488
 HV1488  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1488  COUNTRY     -  US
 HV1488  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1488
 HV1488                         *CURRENT SURVEY CONTROL
 HV1488  ______________________________________________________________________
 HV1488* NAD 83(1993) POSITION- 38 55 31.53362(N) 076 57 55.25739(W)   ADJUSTED
 HV1488* NAVD 88 ORTHO HEIGHT -    29.177 (meters)       95.72  (feet) ADJUSTED
 HV1488  ______________________________________________________________________
 HV1488  GEOID HEIGHT    -        -32.146 (meters)                     GEOID18
 HV1488  LAPLACE CORR    -         -4.63  (seconds)                    DEFLEC18
 HV1488  DYNAMIC HEIGHT  -         29.161 (meters)       95.67  (feet) COMP
 HV1488  MODELED GRAVITY -    980,104.2   (mgal)                       NAVD 88
 HV1488
 HV1488  HORZ ORDER      -  SECOND
 HV1488  VERT ORDER      -  SECOND    CLASS 0
 HV1488
 HV1488.The horizontal coordinates were established by classical geodetic methods
 HV1488.and adjusted by the National Geodetic Survey in November 1994.
 HV1488
 HV1488.The orthometric height was determined by differential leveling and
 HV1488.adjusted by the NATIONAL GEODETIC SURVEY
 HV1488.in June 1991.
 HV1488
 HV1488.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1488.GEOID18 height accuracy estimate available here.
 HV1488
 HV1488.Click photographs - Photos may exist for this station.
 HV1488
 HV1488.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1488
 HV1488.The dynamic height is computed by dividing the NAVD 88
 HV1488.geopotential number by the normal gravity value computed on the
 HV1488.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1488.degrees latitude (g = 980.6199 gals.).
 HV1488
 HV1488.The modeled gravity was interpolated from observed gravity values.
 HV1488
 HV1488. The following values were computed from the NAD 83(1993) position.
 HV1488
 HV1488;                    North         East     Units Scale Factor Converg.
 HV1488;SPC MD       -   139,728.369   403,004.666   MT  0.99995022   +0 01 18.3
 HV1488;SPC MD       -   458,425.49  1,322,191.14   sFT  0.99995022   +0 01 18.3
 HV1488;SPC VA N     - 2,140,834.962 3,633,069.561   MT  0.99996279   +0 57 28.1
 HV1488;SPC VA N     - 7,023,722.70 11,919,495.72   sFT  0.99996279   +0 57 28.1
 HV1488;UTM  18      - 4,310,337.383   329,631.353   MT  0.99995742   -1 14 06.5
 HV1488
 HV1488!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1488!SPC MD       -   1.00000047  x   0.99995022  =   0.99995069
 HV1488!SPC VA N     -   1.00000047  x   0.99996279  =   0.99996326
 HV1488!UTM  18      -   1.00000047  x   0.99995742  =   0.99995789
 HV1488
 HV1488:                Primary Azimuth Mark                     Grid Az
 HV1488:SPC MD       -  N E 137 B 1960                           320 44 48.4
 HV1488:SPC VA N     -  N E 137 B 1960                           319 48 38.6
 HV1488:UTM  18      -  N E 137 B 1960                           322 00 13.2
 HV1488
 HV1488_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2963110337(NAD 83)
 HV1488
 HV1488|---------------------------------------------------------------------|
 HV1488| PID    Reference Object                     Distance      Geod. Az  |
 HV1488|                                                           dddmmss.s |
 HV1488| HV1489 NE 137 D MADHOP                     342.776 METERS 13409     |
 HV1488| HV7732 N E 137 B 1960                      422.183 METERS 3204606.7 |
 HV1488|---------------------------------------------------------------------|
 HV1488
 HV1488                          SUPERSEDED SURVEY CONTROL
 HV1488
 HV1488  NAD 83(1991)-  38 55 31.53247(N)    076 57 55.25838(W) AD(       ) 2
 HV1488  NAD 83(1986)-  38 55 31.53143(N)    076 57 55.26872(W) AD(       ) 2
 HV1488  NAD 27      -  38 55 31.13200(N)    076 57 56.35710(W) AD(       ) 2
 HV1488  NGVD 29              29.41   (m)           96.5    (f) LEVELING    3  
 HV1488  NGVD 29 (11/26/84)   29.410  (m)           96.49   (f) ADJUSTED    2 0
 HV1488
 HV1488.Superseded values are not recommended for survey control.
 HV1488
 HV1488.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1488.See file dsdata.pdf to determine how the superseded data were derived.
 HV1488
 HV1488_MARKER: Z = SEE DESCRIPTION
 HV1488_SETTING: 0 = UNSPECIFIED SETTING
 HV1488_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1488
 HV1488  HISTORY     - Date     Condition        Report By
 HV1488  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1488  HISTORY     - 1960     GOOD             MADHOP
 HV1488  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV1488
 HV1488                          STATION DESCRIPTION
 HV1488
 HV1488'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1488'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV1488
 HV1488                          STATION RECOVERY (1960)
 HV1488
 HV1488'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1488'IN DC.
 HV1488'LOCATED ON SOUTH DAKOTA AVE. BETWEEN FRANKLIN AVE. N.E. AND
 HV1488'BLADENSBURG RD. N.E. 5.93 FT SOUTHWEST OF CROSS CUT IN TOP OF
 HV1488'IRON FENCE POST ON EDGE OF PARK, AND 7.68 FT NORTHWEST OF CROSS
 HV1488'CUT IN TOP OF IRON FENCE POST AT PARK ENTRANCE, AND 5.8 FT
 HV1488'NORTHWEST OF LINE DRAWN PERPENDICULAR TO S. DAKOTA AVE. AND AN
 HV1488'EXTENSION OF PARK ENTRANCE EDGE. PIPE AND TACK.
 HV1488
 HV1488                          STATION RECOVERY (1971)
 HV1488
 HV1488'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1488'STATION HAS BEEN DESTROYED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1489 ***********************************************************************
 HV1489  DESIGNATION -  NE 137 D MADHOP
 HV1489  PID         -  HV1489
 HV1489  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1489  COUNTRY     -  US
 HV1489  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1489
 HV1489                         *CURRENT SURVEY CONTROL
 HV1489  ______________________________________________________________________
 HV1489* NAD 83(1993) POSITION- 38 55 23.79091(N) 076 57 45.04748(W)   ADJUSTED
 HV1489* NAVD 88 ORTHO HEIGHT -    34.408 (meters)      112.89  (feet) ADJUSTED
 HV1489  ______________________________________________________________________
 HV1489  GEOID HEIGHT    -        -32.157 (meters)                     GEOID18
 HV1489  LAPLACE CORR    -         -4.65  (seconds)                    DEFLEC18
 HV1489  DYNAMIC HEIGHT  -         34.390 (meters)      112.83  (feet) COMP
 HV1489  MODELED GRAVITY -    980,103.1   (mgal)                       NAVD 88
 HV1489
 HV1489  HORZ ORDER      -  SECOND
 HV1489  VERT ORDER      -  SECOND    CLASS 0
 HV1489
 HV1489.The horizontal coordinates were established by classical geodetic methods
 HV1489.and adjusted by the National Geodetic Survey in November 1994.
 HV1489
 HV1489.The orthometric height was determined by differential leveling and
 HV1489.adjusted by the NATIONAL GEODETIC SURVEY
 HV1489.in June 1991.
 HV1489
 HV1489.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1489.GEOID18 height accuracy estimate available here.
 HV1489
 HV1489.Click photographs - Photos may exist for this station.
 HV1489
 HV1489.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1489
 HV1489.The dynamic height is computed by dividing the NAVD 88
 HV1489.geopotential number by the normal gravity value computed on the
 HV1489.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1489.degrees latitude (g = 980.6199 gals.).
 HV1489
 HV1489.The modeled gravity was interpolated from observed gravity values.
 HV1489
 HV1489. The following values were computed from the NAD 83(1993) position.
 HV1489
 HV1489;                    North         East     Units Scale Factor Converg.
 HV1489;SPC MD       -   139,489.714   403,250.690   MT  0.99995019   +0 01 24.7
 HV1489;SPC MD       -   457,642.50  1,322,998.31   sFT  0.99995019   +0 01 24.7
 HV1489;SPC VA N     - 2,140,600.355 3,633,319.453   MT  0.99996259   +0 57 34.5
 HV1489;SPC VA N     - 7,022,953.00 11,920,315.57   sFT  0.99996259   +0 57 34.5
 HV1489;UTM  18      - 4,310,093.388   329,872.084   MT  0.99995641   -1 13 59.9
 HV1489
 HV1489!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1489!SPC MD       -   0.99999965  x   0.99995019  =   0.99994984
 HV1489!SPC VA N     -   0.99999965  x   0.99996259  =   0.99996224
 HV1489!UTM  18      -   0.99999965  x   0.99995641  =   0.99995606
 HV1489
 HV1489_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2987210093(NAD 83)
 HV1489
 HV1489|---------------------------------------------------------------------|
 HV1489| PID    Reference Object                     Distance      Geod. Az  |
 HV1489|                                                           dddmmss.s |
 HV1489| HV7711 N E 137 E 1960                      380.144 METERS 12938     |
 HV1489| HV1488 NE 137 C MADHOP                     342.776 METERS 31409     |
 HV1489|---------------------------------------------------------------------|
 HV1489
 HV1489                          SUPERSEDED SURVEY CONTROL
 HV1489
 HV1489  NAD 83(1991)-  38 55 23.78975(N)    076 57 45.04847(W) AD(       ) 2
 HV1489  NAD 83(1986)-  38 55 23.78872(N)    076 57 45.05884(W) AD(       ) 2
 HV1489  NAD 27      -  38 55 23.38880(N)    076 57 46.14800(W) AD(       ) 2
 HV1489  NGVD 29              34.64   (m)          113.6    (f) LEVELING    3  
 HV1489  NGVD 29 (11/26/84)   34.642  (m)          113.65   (f) ADJUSTED    2 0
 HV1489
 HV1489.Superseded values are not recommended for survey control.
 HV1489
 HV1489.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1489.See file dsdata.pdf to determine how the superseded data were derived.
 HV1489
 HV1489_MARKER: Z = SEE DESCRIPTION
 HV1489_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1489_SP_SET: CURB EDGE
 HV1489_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1489
 HV1489  HISTORY     - Date     Condition        Report By
 HV1489  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1489  HISTORY     - 1960     GOOD             MADHOP
 HV1489  HISTORY     - 1971     GOOD             NGS
 HV1489
 HV1489                          STATION DESCRIPTION
 HV1489
 HV1489'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1489'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV1489
 HV1489                          STATION RECOVERY (1960)
 HV1489
 HV1489'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1489'IN DC.
 HV1489'LOCATED ON SOUTH DAKOTA AVE. 47.65 FT SOUTHEAST OF P.C. OF CURB
 HV1489'AT DOUGLAS ST. N.E., AND 41.24 FT SOUTHEAST OF SOUTHEAST CORNER
 HV1489'OF PORCH ON BUILDING 2428, AND 19.62 FT NORTHEAST OF CORNER OF
 HV1489'CONC. SLAB AND BACK EDGE OF WALK.  A PIPE AND TACK SET IN EDGE
 HV1489'OF CURB.
 HV1489
 HV1489                          STATION RECOVERY (1971)
 HV1489
 HV1489'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1489'THE STATION RECOVERED AS SHOWN ON SKETCH OF DESCRIPTION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1495 ***********************************************************************
 HV1495  DESIGNATION -  NE 138 DCDHT
 HV1495  PID         -  HV1495
 HV1495  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1495  COUNTRY     -  US
 HV1495  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1495
 HV1495                         *CURRENT SURVEY CONTROL
 HV1495  ______________________________________________________________________
 HV1495* NAD 83(1993) POSITION- 38 56 00.56231(N) 076 59 34.06927(W)   ADJUSTED
 HV1495* NAVD 88 ORTHO HEIGHT -    47.020 (meters)      154.26  (feet) ADJUSTED
 HV1495  ______________________________________________________________________
 HV1495  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV1495  LAPLACE CORR    -         -3.71  (seconds)                    DEFLEC18
 HV1495  DYNAMIC HEIGHT  -         46.996 (meters)      154.19  (feet) COMP
 HV1495  MODELED GRAVITY -    980,109.1   (mgal)                       NAVD 88
 HV1495
 HV1495  HORZ ORDER      -  SECOND
 HV1495  VERT ORDER      -  SECOND    CLASS 0
 HV1495
 HV1495.The horizontal coordinates were established by classical geodetic methods
 HV1495.and adjusted by the National Geodetic Survey in November 1994.
 HV1495
 HV1495.The orthometric height was determined by differential leveling and
 HV1495.adjusted by the NATIONAL GEODETIC SURVEY
 HV1495.in June 1991.
 HV1495
 HV1495.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1495.GEOID18 height accuracy estimate available here.
 HV1495
 HV1495.Click photographs - Photos may exist for this station.
 HV1495
 HV1495.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1495
 HV1495.The dynamic height is computed by dividing the NAVD 88
 HV1495.geopotential number by the normal gravity value computed on the
 HV1495.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1495.degrees latitude (g = 980.6199 gals.).
 HV1495
 HV1495.The modeled gravity was interpolated from observed gravity values.
 HV1495
 HV1495. The following values were computed from the NAD 83(1993) position.
 HV1495
 HV1495;                    North         East     Units Scale Factor Converg.
 HV1495;SPC MD       -   140,622.944   400,624.521   MT  0.99995035   +0 00 16.3
 HV1495;SPC MD       -   461,360.44  1,314,382.28   sFT  0.99995035   +0 00 16.3
 HV1495;SPC VA N     - 2,141,690.543 3,630,675.087   MT  0.99996356   +0 56 26.4
 HV1495;SPC VA N     - 7,026,529.72 11,911,639.85   sFT  0.99996356   +0 56 26.4
 HV1495;UTM  18      - 4,311,283.969   327,271.377   MT  0.99996739   -1 15 09.4
 HV1495
 HV1495!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1495!SPC MD       -   0.99999765  x   0.99995035  =   0.99994800
 HV1495!SPC VA N     -   0.99999765  x   0.99996356  =   0.99996121
 HV1495!UTM  18      -   0.99999765  x   0.99996739  =   0.99996504
 HV1495
 HV1495_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2727111283(NAD 83)
 HV1495
 HV1495                          SUPERSEDED SURVEY CONTROL
 HV1495
 HV1495  NAD 83(1991)-  38 56 00.56125(N)    076 59 34.07028(W) AD(       ) 2
 HV1495  NAD 83(1986)-  38 56 00.56032(N)    076 59 34.08052(W) AD(       ) 2
 HV1495  NAD 27      -  38 56 00.16180(N)    076 59 35.16510(W) AD(       ) 2
 HV1495  NGVD 29              47.25   (m)          155.0    (f) LEVELING    3  
 HV1495  NGVD 29 (11/26/84)   47.249  (m)          155.02   (f) ADJUSTED    2 0
 HV1495
 HV1495.Superseded values are not recommended for survey control.
 HV1495
 HV1495.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1495.See file dsdata.pdf to determine how the superseded data were derived.
 HV1495
 HV1495_MARKER: DD = SURVEY DISK
 HV1495_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1495_STAMPING: USCGS NO NE 138
 HV1495_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1495+STABILITY: SURFACE MOTION
 HV1495
 HV1495  HISTORY     - Date     Condition        Report By
 HV1495  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1495  HISTORY     - 1960     GOOD             MADHOP
 HV1495  HISTORY     - 1971     GOOD             NGS
 HV1495
 HV1495                          STATION DESCRIPTION
 HV1495
 HV1495'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1495'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1495'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO NE 138 SET IN
 HV1495'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1495'COVER WITH LID LABELED SURVEY.
 HV1495
 HV1495                          STATION RECOVERY (1960)
 HV1495
 HV1495'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1495'IN DC.
 HV1495'LOCATED NEAR INTERSECTION OF NEWTON ST. N.E. AND 10TH ST. N.E.
 HV1495'IN NORTHWEST CORNER OF INTERSECTION.  23.97 FT NORTHEAST OF CROSS
 HV1495'CUT IN SEWER MANHOLE RIM IN ROADWAY OF NEWTON ST., AND 26.72 FT
 HV1495'NORTHWEST OF CROSS CUT IN WATER MANHOLE RIM IN INTERSECTION
 HV1495'ROADWAY, AND 12.22 FT SOUTHWEST OF CROSS CUT ON GAS VALVE RIM.
 HV1495'AT THE CORNER OF SIDEWALK.  A STANDARD BRASS DISC SET IN TOP OF
 HV1495'12 IN CONC. MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH
 HV1495'LID LABELED SURVEY.
 HV1495
 HV1495                          STATION RECOVERY (1971)
 HV1495
 HV1495'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1495'STATION RECOVERED IN GOOD CONDITION AND IS AS DESCRIBED WITH THE
 HV1495'EXCEPTION.  THE MANHOLE COVER LID IS MISSING AND THE STATION IS
 HV1495'INSIDE A SQUARE METAL BOX.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2186 ***********************************************************************
 HV2186  DESIGNATION -  NE 139 RESET
 HV2186  PID         -  HV2186
 HV2186  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2186  COUNTRY     -  US
 HV2186  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2186
 HV2186                         *CURRENT SURVEY CONTROL
 HV2186  ______________________________________________________________________
 HV2186* NAD 83(1993) POSITION- 38 54 32.53416(N) 077 00 16.62371(W)   ADJUSTED
 HV2186* NAVD 88 ORTHO HEIGHT -    18.63  (meters)       61.1   (feet) RESET
 HV2186  ______________________________________________________________________
 HV2186  GEOID HEIGHT    -        -32.095 (meters)                     GEOID18
 HV2186  LAPLACE CORR    -         -3.47  (seconds)                    DEFLEC18
 HV2186  HORZ ORDER      -  SECOND
 HV2186  VERT ORDER      -  THIRD
 HV2186
 HV2186.The horizontal coordinates were established by classical geodetic methods
 HV2186.and adjusted by the National Geodetic Survey in November 1994.
 HV2186
 HV2186.The orthometric height was computed from unverified reset data.
 HV2186
 HV2186.No vertical observational check was made to the station.
 HV2186
 HV2186.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2186.GEOID18 height accuracy estimate available here.
 HV2186
 HV2186.Click photographs - Photos may exist for this station.
 HV2186
 HV2186.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2186
 HV2186. The following values were computed from the NAD 83(1993) position.
 HV2186
 HV2186;                    North         East     Units Scale Factor Converg.
 HV2186;SPC MD       -   137,908.521   399,599.494   MT  0.99995002   -0 00 10.4
 HV2186;SPC MD       -   452,454.87  1,311,019.34   sFT  0.99995002   -0 00 10.4
 HV2186;SPC VA N     - 2,138,959.702 3,629,694.535   MT  0.99996130   +0 55 59.9
 HV2186;SPC VA N     - 7,017,570.29 11,908,422.82   sFT  0.99996130   +0 55 59.9
 HV2186;UTM  18      - 4,308,592.630   326,187.037   MT  0.99997202   -1 15 33.8
 HV2186
 HV2186!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2186!SPC MD       -   1.00000211  x   0.99995002  =   0.99995213
 HV2186!SPC VA N     -   1.00000211  x   0.99996130  =   0.99996341
 HV2186!UTM  18      -   1.00000211  x   0.99997202  =   0.99997413
 HV2186
 HV2186:                Primary Azimuth Mark                     Grid Az
 HV2186:SPC MD       -  NE 132 B DCDHT                           294 58 46.7
 HV2186:SPC VA N     -  NE 132 B DCDHT                           294 02 36.4
 HV2186:UTM  18      -  NE 132 B DCDHT                           296 14 10.1
 HV2186
 HV2186_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2618708592(NAD 83)
 HV2186
 HV2186|---------------------------------------------------------------------|
 HV2186| PID    Reference Object                     Distance      Geod. Az  |
 HV2186|                                                           dddmmss.s |
 HV2186| DC6930 NE 139 RESET AZ MK                                 2424415.7 |
 HV2186| HV2184 NE 132 B DCDHT                      407.260 METERS 2945836.3 |
 HV2186|---------------------------------------------------------------------|
 HV2186
 HV2186                          SUPERSEDED SURVEY CONTROL
 HV2186
 HV2186  NAD 83(1991)-  38 54 32.53309(N)    077 00 16.62485(W) AD(       ) 2
 HV2186  NAD 83(1986)-  38 54 32.53226(N)    077 00 16.63545(W) AD(       ) 2
 HV2186  NAD 27      -  38 54 32.13250(N)    077 00 17.71790(W) AD(       ) 2
 HV2186  NGVD 29 (??/??/??)   18.86   (m)           61.9    (f) RESET       3  
 HV2186  NGVD 29              18.86   (m)           61.9    (f) LEVELING    3  
 HV2186
 HV2186.Superseded values are not recommended for survey control.
 HV2186
 HV2186.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2186.See file dsdata.pdf to determine how the superseded data were derived.
 HV2186
 HV2186_MARKER: DD = SURVEY DISK
 HV2186_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2186_SP_SET: MONUMENT
 HV2186_STAMPING: USCGS NO NE 139 RESET
 HV2186_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2186
 HV2186  HISTORY     - Date     Condition        Report By
 HV2186  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2186  HISTORY     - 1960     GOOD             MADHOP
 HV2186  HISTORY     - 1971     GOOD             NGS
 HV2186
 HV2186                          STATION DESCRIPTION
 HV2186
 HV2186'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2186'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2186'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.+E. 139 RESET
 HV2186'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2186'COVER WITH LID LABELED SURVEY.  STATION 139 WAS LOWERED IN SAME
 HV2186'HORIZONTAL POSITION.  AZIMUTH MARK = N.E. 139-AZ.
 HV2186'
 HV2186'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2186'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NW 139-AZ. SET
 HV2186'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2186'COVER WITH LID LABELED SURVEY.  THIS STATION IS AZIMUTH MARK FOR
 HV2186'NE 139.  NO POSITION DETERMINED.
 HV2186
 HV2186                          STATION RECOVERY (1960)
 HV2186
 HV2186'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2186'IN WASHINGTON DC.
 HV2186'LOCATED AT INTERSECTION OF NEW YORK AVE. NE. AND FLORIDA AVE.
 HV2186'N.E. IN NORTHEAST CORNER OF INTERSECTION.  61.44 FT. SOUTHEAST
 HV2186'OF CROSSCUT IN RIM OF MANHOLE, AND APPROX. 22 FT. NORTHWEST OF
 HV2186'CROSS CUT IN MANHOLE RIM, AND 14.9 FT. NORTHEAST OF CROSS CUT
 HV2186'IN MANHOLE RIM.  A STANDARD BRASS DISC SET IN TOP OF 12 IN.
 HV2186'CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH
 HV2186'LID LABELED SURVEY.
 HV2186
 HV2186                          STATION RECOVERY (1971)
 HV2186
 HV2186'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2186'STATION WAS RECOVERED IN GOOD CONDITION.  IT IS 21.2 FEET
 HV2186'SOUTHWEST OF A CROSS CUT IN RIM OF MANHOLE, 13.25 FEET SOUTHWEST
 HV2186'OF CROSS CUT ON SHOULDER OF A TRAFFIC SIGNAL POLE AND 61.44 FEET
 HV2186'SOUTHEAST OF A CROSS CUT ON ANOTHER MANHOLE RIM, SET IN THE
 HV2186'SOUTHWEST, ROUNDED END OF A CONCRETE SIDEWALK, BENEATH A SQUARE,
 HV2186'IRON MANHOLE LID (WHICH IS NOT LABELED).
 HV2186'
 HV2186'NOTE--THE LINE BACK TO NE 140 IS NOW BLOCKED BY AN OVERPASS BRIDGE.
 HV2186'
 HV2186'THE AZIMUTH MARK WAS SEARCHED FOR BUT NOT FOUND, AND IS BELIEVED
 HV2186'DESTROYED.
 HV2186'
 HV2186'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2186'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1492 ***********************************************************************
 HV1492  DESIGNATION -  NE 140 DCDHT
 HV1492  PID         -  HV1492
 HV1492  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1492  COUNTRY     -  US
 HV1492  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1492
 HV1492                         *CURRENT SURVEY CONTROL
 HV1492  ______________________________________________________________________
 HV1492* NAD 83(1993) POSITION- 38 54 49.54712(N) 076 59 33.48559(W)   ADJUSTED
 HV1492* NAVD 88 ORTHO HEIGHT -    43.812 (meters)      143.74  (feet) ADJUSTED
 HV1492  ______________________________________________________________________
 HV1492  GEOID HEIGHT    -        -32.108 (meters)                     GEOID18
 HV1492  LAPLACE CORR    -         -3.87  (seconds)                    DEFLEC18
 HV1492  DYNAMIC HEIGHT  -         43.789 (meters)      143.66  (feet) COMP
 HV1492  MODELED GRAVITY -    980,106.4   (mgal)                       NAVD 88
 HV1492
 HV1492  HORZ ORDER      -  SECOND
 HV1492  VERT ORDER      -  SECOND    CLASS 0
 HV1492
 HV1492.The horizontal coordinates were established by classical geodetic methods
 HV1492.and adjusted by the National Geodetic Survey in November 1994.
 HV1492
 HV1492.The orthometric height was determined by differential leveling and
 HV1492.adjusted by the NATIONAL GEODETIC SURVEY
 HV1492.in June 1991.
 HV1492
 HV1492.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1492.GEOID18 height accuracy estimate available here.
 HV1492
 HV1492.Click photographs - Photos may exist for this station.
 HV1492
 HV1492.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1492
 HV1492.The dynamic height is computed by dividing the NAVD 88
 HV1492.geopotential number by the normal gravity value computed on the
 HV1492.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1492.degrees latitude (g = 980.6199 gals.).
 HV1492
 HV1492.The modeled gravity was interpolated from observed gravity values.
 HV1492
 HV1492. The following values were computed from the NAD 83(1993) position.
 HV1492
 HV1492;                    North         East     Units Scale Factor Converg.
 HV1492;SPC MD       -   138,433.142   400,638.755   MT  0.99995007   +0 00 16.6
 HV1492;SPC MD       -   454,176.07  1,314,428.98   sFT  0.99995007   +0 00 16.6
 HV1492;SPC VA N     - 2,139,501.239 3,630,725.097   MT  0.99996172   +0 56 26.8
 HV1492;SPC VA N     - 7,019,346.98 11,911,803.92   sFT  0.99996172   +0 56 26.8
 HV1492;UTM  18      - 4,309,094.344   327,237.574   MT  0.99996754   -1 15 07.1
 HV1492
 HV1492!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1492!SPC MD       -   0.99999816  x   0.99995007  =   0.99994823
 HV1492!SPC VA N     -   0.99999816  x   0.99996172  =   0.99995988
 HV1492!UTM  18      -   0.99999816  x   0.99996754  =   0.99996570
 HV1492
 HV1492:                Primary Azimuth Mark                     Grid Az
 HV1492:SPC MD       -  N E 140 A 1960                           069 31 54.1
 HV1492:SPC VA N     -  N E 140 A 1960                           068 35 43.9
 HV1492:UTM  18      -  N E 140 A 1960                           070 47 17.8
 HV1492
 HV1492_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2723709094(NAD 83)
 HV1492
 HV1492|---------------------------------------------------------------------|
 HV1492| PID    Reference Object                     Distance      Geod. Az  |
 HV1492|                                                           dddmmss.s |
 HV1492| HV7721 N E 140 A 1960                      APPROX. 1.1 KM 0693210.7 |
 HV1492|---------------------------------------------------------------------|
 HV1492
 HV1492                          SUPERSEDED SURVEY CONTROL
 HV1492
 HV1492  NAD 83(1991)-  38 54 49.54604(N)    076 59 33.48668(W) AD(       ) 2
 HV1492  NAD 83(1986)-  38 54 49.54514(N)    076 59 33.49722(W) AD(       ) 2
 HV1492  NAD 27      -  38 54 49.14520(N)    076 59 34.58180(W) AD(       ) 2
 HV1492  NGVD 29              44.05   (m)          144.5    (f) LEVELING    3  
 HV1492  NGVD 29 (11/26/84)   44.045  (m)          144.50   (f) ADJUSTED    2 0
 HV1492
 HV1492.Superseded values are not recommended for survey control.
 HV1492
 HV1492.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1492.See file dsdata.pdf to determine how the superseded data were derived.
 HV1492
 HV1492_MARKER: DD = SURVEY DISK
 HV1492_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1492_SP_SET: CONC SLAB
 HV1492_STAMPING: USCGS NO NE 140
 HV1492_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1492
 HV1492  HISTORY     - Date     Condition        Report By
 HV1492  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1492  HISTORY     - 1960     GOOD             MADHOP
 HV1492  HISTORY     - 1971     GOOD             NGS
 HV1492
 HV1492                          STATION DESCRIPTION
 HV1492
 HV1492'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1492'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1492'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.E. 140
 HV1492'GROUTED IN CONCRETE.
 HV1492
 HV1492                          STATION RECOVERY (1960)
 HV1492
 HV1492'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1492'IN DC.
 HV1492'LOCATED BESIDE THE EAST RAMP TO BRENTWOOD PKWY. N.E. FROM NEW
 HV1492'YORK AVE. N.E. AT THE BRIDGE WHERE BRENTWOOD CROSSES OVER NEW
 HV1492'YORK AVE. 26.14 FT WEST OF CROSS CUT IN MANHOLE RIM ON ROADWAY OF
 HV1492'RAMP, AND 31.85 FT NORTH OF CROSS CUT IN NORTHWEST RIM OF INLET.
 HV1492'A STANDARD BRASS DISC GROUTED IN CONCRETE.
 HV1492
 HV1492                          STATION RECOVERY (1971)
 HV1492
 HV1492'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1492'STATION WAS RECOVERED AS DESCRIBED.  THE ORIGINAL DESCRIPTION IS
 HV1492'ADEQUATE.
 HV1492'
 HV1492'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV1492'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1491 ***********************************************************************
 HV1491  DESIGNATION -  NE 141 DCDHT
 HV1491  PID         -  HV1491
 HV1491  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1491  COUNTRY     -  US
 HV1491  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1491
 HV1491                         *CURRENT SURVEY CONTROL
 HV1491  ______________________________________________________________________
 HV1491* NAD 83(1993) POSITION- 38 55 02.60481(N) 076 58 19.99110(W)   ADJUSTED
 HV1491* NAVD 88 ORTHO HEIGHT -    12.904 (meters)       42.34  (feet) ADJUSTED
 HV1491  ______________________________________________________________________
 HV1491  GEOID HEIGHT    -        -32.145 (meters)                     GEOID18
 HV1491  LAPLACE CORR    -         -4.45  (seconds)                    DEFLEC18
 HV1491  DYNAMIC HEIGHT  -         12.898 (meters)       42.32  (feet) COMP
 HV1491  MODELED GRAVITY -    980,103.9   (mgal)                       NAVD 88
 HV1491
 HV1491  HORZ ORDER      -  SECOND
 HV1491  VERT ORDER      -  SECOND    CLASS 0
 HV1491
 HV1491.The horizontal coordinates were established by classical geodetic methods
 HV1491.and adjusted by the National Geodetic Survey in November 1994.
 HV1491
 HV1491.The orthometric height was determined by differential leveling and
 HV1491.adjusted by the NATIONAL GEODETIC SURVEY
 HV1491.in June 1991.
 HV1491
 HV1491.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1491.GEOID18 height accuracy estimate available here.
 HV1491
 HV1491.Click photographs - Photos may exist for this station.
 HV1491
 HV1491.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1491
 HV1491.The dynamic height is computed by dividing the NAVD 88
 HV1491.geopotential number by the normal gravity value computed on the
 HV1491.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1491.degrees latitude (g = 980.6199 gals.).
 HV1491
 HV1491.The modeled gravity was interpolated from observed gravity values.
 HV1491
 HV1491. The following values were computed from the NAD 83(1993) position.
 HV1491
 HV1491;                    North         East     Units Scale Factor Converg.
 HV1491;SPC MD       -   138,836.125   402,409.179   MT  0.99995011   +0 01 02.8
 HV1491;SPC MD       -   455,498.19  1,320,237.45   sFT  0.99995011   +0 01 02.8
 HV1491;SPC VA N     - 2,139,933.098 3,632,488.722   MT  0.99996205   +0 57 12.7
 HV1491;SPC VA N     - 7,020,763.84 11,917,590.08   sFT  0.99996205   +0 57 12.7
 HV1491;UTM  18      - 4,309,458.408   329,016.434   MT  0.99996001   -1 14 21.3
 HV1491
 HV1491!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1491!SPC MD       -   1.00000302  x   0.99995011  =   0.99995313
 HV1491!SPC VA N     -   1.00000302  x   0.99996205  =   0.99996507
 HV1491!UTM  18      -   1.00000302  x   0.99996001  =   0.99996303
 HV1491
 HV1491:                Primary Azimuth Mark                     Grid Az
 HV1491:SPC MD       -  N E 141 A 1960                           093 19 28.2
 HV1491:SPC VA N     -  N E 141 A 1960                           092 23 18.3
 HV1491:UTM  18      -  N E 141 A 1960                           094 34 52.3
 HV1491
 HV1491_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2901609458(NAD 83)
 HV1491
 HV1491|---------------------------------------------------------------------|
 HV1491| PID    Reference Object                     Distance      Geod. Az  |
 HV1491|                                                           dddmmss.s |
 HV1491| HV7707 N E 141 A 1960                      APPROX. 1.2 KM 0932031.0 |
 HV1491|---------------------------------------------------------------------|
 HV1491
 HV1491                          SUPERSEDED SURVEY CONTROL
 HV1491
 HV1491  NAD 83(1991)-  38 55 02.60368(N)    076 58 19.99215(W) AD(       ) 2
 HV1491  NAD 83(1986)-  38 55 02.60269(N)    076 58 20.00259(W) AD(       ) 2
 HV1491  NAD 27      -  38 55 02.20240(N)    076 58 21.09050(W) AD(       ) 2
 HV1491  NGVD 29              13.14   (m)           43.1    (f) LEVELING    3  
 HV1491  NGVD 29 (11/26/84)   13.141  (m)           43.11   (f) ADJUSTED    2 0
 HV1491
 HV1491.Superseded values are not recommended for survey control.
 HV1491
 HV1491.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1491.See file dsdata.pdf to determine how the superseded data were derived.
 HV1491
 HV1491_MARKER: DD = SURVEY DISK
 HV1491_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1491_STAMPING: USCGS NO NE 141
 HV1491_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1491+STABILITY: SURFACE MOTION
 HV1491
 HV1491  HISTORY     - Date     Condition        Report By
 HV1491  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1491  HISTORY     - 1960     GOOD             MADHOP
 HV1491  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV1491
 HV1491                          STATION DESCRIPTION
 HV1491
 HV1491'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1491'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1491'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO. NE 141 SET IN
 HV1491'TOP OF 12 INCH CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1491'COVER WITH LID LABELED SURVEY.
 HV1491
 HV1491                          STATION RECOVERY (1960)
 HV1491
 HV1491'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1491'IN DC.
 HV1491'LOCATED AT INTERSECTION OF NEW YORK AVE. N.E. AND BLADENSBURG RD.
 HV1491'N.E. 17.97 FT NORTHEAST OF CROSS CUT IN SIGNAL LIGHT BASE, AND
 HV1491'32.25 FT SOUTHWEST OF CROSS CUT ON MANHOLE RIM ON ROADWAY OF
 HV1491'NEW YORK AVE., AND 42.02 FT NORTHWEST OF CROSS CUT IN MANHOLE
 HV1491'RIM ON MEDIAN OF NEW YORK AVE. (SOUTH SIDE OF ROAD.)  A STANDARD
 HV1491'BRASS DISC SET IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A
 HV1491'STANDARD MANHOLE COVER WITH LID LABELED SURVEY.
 HV1491
 HV1491                          STATION RECOVERY (1971)
 HV1491
 HV1491'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1491'STATION HAS BEEN DESTROYED BY CONSTRUCTION OF A NEW BRICK MEDIAL
 HV1491'STRIP.  SOME BRICKS WERE REMOVED AND DIGGING DONE, WHICH REVEALED
 HV1491'A CONCRETE BASE FOR THE MEDIAL STRIP.
 HV1491'
 HV1491'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV1491'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1490 ***********************************************************************
 HV1490  DESIGNATION -  NE 142 DCDHT
 HV1490  PID         -  HV1490
 HV1490  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1490  COUNTRY     -  US
 HV1490  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1490
 HV1490                         *CURRENT SURVEY CONTROL
 HV1490  ______________________________________________________________________
 HV1490* NAD 83(1993) POSITION- 38 55 05.20899(N) 076 57 18.09150(W)   ADJUSTED
 HV1490* NAVD 88 ORTHO HEIGHT -    23.674 (meters)       77.67  (feet) ADJUSTED
 HV1490  ______________________________________________________________________
 HV1490  GEOID HEIGHT    -        -32.184 (meters)                     GEOID18
 HV1490  LAPLACE CORR    -         -4.61  (seconds)                    DEFLEC18
 HV1490  DYNAMIC HEIGHT  -         23.661 (meters)       77.63  (feet) COMP
 HV1490  MODELED GRAVITY -    980,100.1   (mgal)                       NAVD 88
 HV1490
 HV1490  HORZ ORDER      -  SECOND
 HV1490  VERT ORDER      -  SECOND    CLASS 0
 HV1490
 HV1490.The horizontal coordinates were established by classical geodetic methods
 HV1490.and adjusted by the National Geodetic Survey in November 1994.
 HV1490
 HV1490.The orthometric height was determined by differential leveling and
 HV1490.adjusted by the NATIONAL GEODETIC SURVEY
 HV1490.in June 1991.
 HV1490
 HV1490.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1490.GEOID18 height accuracy estimate available here.
 HV1490
 HV1490.Click photographs - Photos may exist for this station.
 HV1490
 HV1490.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1490
 HV1490.The dynamic height is computed by dividing the NAVD 88
 HV1490.geopotential number by the normal gravity value computed on the
 HV1490.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1490.degrees latitude (g = 980.6199 gals.).
 HV1490
 HV1490.The modeled gravity was interpolated from observed gravity values.
 HV1490
 HV1490. The following values were computed from the NAD 83(1993) position.
 HV1490
 HV1490;                    North         East     Units Scale Factor Converg.
 HV1490;SPC MD       -   138,917.021   403,900.278   MT  0.99995012   +0 01 41.6
 HV1490;SPC MD       -   455,763.59  1,325,129.50   sFT  0.99995012   +0 01 41.6
 HV1490;SPC VA N     - 2,140,038.344 3,633,978.319   MT  0.99996211   +0 57 51.3
 HV1490;SPC VA N     - 7,021,109.13 11,922,477.20   sFT  0.99996211   +0 57 51.3
 HV1490;UTM  18      - 4,309,506.583   330,508.959   MT  0.99995375   -1 13 42.4
 HV1490
 HV1490!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1490!SPC MD       -   1.00000134  x   0.99995012  =   0.99995146
 HV1490!SPC VA N     -   1.00000134  x   0.99996211  =   0.99996345
 HV1490!UTM  18      -   1.00000134  x   0.99995375  =   0.99995509
 HV1490
 HV1490:                Primary Azimuth Mark                     Grid Az
 HV1490:SPC MD       -  N E 137 E 1960                           312 47 40.3
 HV1490:SPC VA N     -  N E 137 E 1960                           311 51 30.6
 HV1490:UTM  18      -  N E 137 E 1960                           314 03 04.3
 HV1490
 HV1490_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3050809506(NAD 83)
 HV1490
 HV1490|---------------------------------------------------------------------|
 HV1490| PID    Reference Object                     Distance      Geod. Az  |
 HV1490|                                                           dddmmss.s |
 HV1490| HV7707 N E 141 A 1960                      303.538 METERS 23955     |
 HV1490| HV4488 WASHINGTON IMM CON SHRINE TWR       APPROX. 4.3 KM 2921949.5 |
 HV1490| HV7711 N E 137 E 1960                      486.220 METERS 3124921.9 |
 HV1490|---------------------------------------------------------------------|
 HV1490
 HV1490                          SUPERSEDED SURVEY CONTROL
 HV1490
 HV1490  NAD 83(1991)-  38 55 05.20779(N)    076 57 18.09252(W) AD(       ) 2
 HV1490  NAD 83(1986)-  38 55 05.20676(N)    076 57 18.10293(W) AD(       ) 2
 HV1490  NAD 27      -  38 55 04.80620(N)    076 57 19.19390(W) AD(       ) 2
 HV1490  NGVD 29              23.91   (m)           78.4    (f) LEVELING    3  
 HV1490  NGVD 29 (11/26/84)   23.908  (m)           78.44   (f) ADJUSTED    2 0
 HV1490
 HV1490.Superseded values are not recommended for survey control.
 HV1490
 HV1490.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1490.See file dsdata.pdf to determine how the superseded data were derived.
 HV1490
 HV1490_MARKER: DD = SURVEY DISK
 HV1490_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1490_SP_SET: CONC WALK
 HV1490_STAMPING: USCGS NO NE 142
 HV1490_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1490
 HV1490  HISTORY     - Date     Condition        Report By
 HV1490  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1490  HISTORY     - 1960     GOOD             MADHOP
 HV1490  HISTORY     - 1971     GOOD             NGS
 HV1490
 HV1490                          STATION DESCRIPTION
 HV1490
 HV1490'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1490'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1490'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.E. 142 GROUTED
 HV1490'IN A CONCRETE WALK.
 HV1490
 HV1490                          STATION RECOVERY (1960)
 HV1490
 HV1490'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1490'IN DC.
 HV1490'LOCATED ON NEW YORK AVE. N.E. ON BRIDGE OVER SOUTH DAKOTA AVE.
 HV1490'N.E. 56.72 FT NORTHEAST OF CROSS CUT ON RIM OF STEEL BOX, AND
 HV1490'7.04 FT NORTHEAST OF CROSS CUT IN BASE OF RAIL, AND 4.92 FT WEST
 HV1490'OF CROSS CUT IN BASE OF RAILS.  A STANDARD BRASS DISC GROUTED
 HV1490'IN A CONCRETE WALK.
 HV1490
 HV1490                          STATION RECOVERY (1971)
 HV1490
 HV1490'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1490'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE ORIGINAL
 HV1490'DESCRIPTION IS ADEQUATE.
 HV1490'
 HV1490'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV1490'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7700 ***********************************************************************
 HV7700  DESIGNATION -  NE 143 B
 HV7700  PID         -  HV7700
 HV7700  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7700  COUNTRY     -  US
 HV7700  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7700
 HV7700                         *CURRENT SURVEY CONTROL
 HV7700  ______________________________________________________________________
 HV7700* NAD 83(1993) POSITION- 38 53 52.40984(N) 076 59 21.08387(W)   ADJUSTED
 HV7700* NAVD 88 ORTHO HEIGHT -    17.    (meters)       56.    (feet) SCALED
 HV7700  ______________________________________________________________________
 HV7700  GEOID HEIGHT    -        -32.148 (meters)                     GEOID18
 HV7700  LAPLACE CORR    -         -3.85  (seconds)                    DEFLEC18
 HV7700  HORZ ORDER      -  SECOND
 HV7700
 HV7700.The horizontal coordinates were established by classical geodetic methods
 HV7700.and adjusted by the National Geodetic Survey in November 1994.
 HV7700
 HV7700.The orthometric height was scaled from a topographic map.
 HV7700
 HV7700.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7700.GEOID18 height accuracy estimate available here.
 HV7700
 HV7700.Click photographs - Photos may exist for this station.
 HV7700
 HV7700.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7700
 HV7700. The following values were computed from the NAD 83(1993) position.
 HV7700
 HV7700;                    North         East     Units Scale Factor Converg.
 HV7700;SPC MD       -   136,671.310   400,937.732   MT  0.99994992   +0 00 24.4
 HV7700;SPC MD       -   448,395.79  1,315,409.88   sFT  0.99994992   +0 00 24.4
 HV7700;SPC VA N     - 2,137,744.508 3,631,052.823   MT  0.99996033   +0 56 34.5
 HV7700;SPC VA N     - 7,013,583.44 11,912,879.14   sFT  0.99996033   +0 56 34.5
 HV7700;UTM  18      - 4,307,326.350   327,497.853   MT  0.99996643   -1 14 57.8
 HV7700
 HV7700!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7700!SPC MD       -   1.00000241  x   0.99994992  =   0.99995233
 HV7700!SPC VA N     -   1.00000241  x   0.99996033  =   0.99996274
 HV7700!UTM  18      -   1.00000241  x   0.99996643  =   0.99996884
 HV7700
 HV7700:                Primary Azimuth Mark                     Grid Az
 HV7700:SPC MD       -  NE 144 RESET 2                           062 14 55.7
 HV7700:SPC VA N     -  NE 144 RESET 2                           061 18 45.6
 HV7700:UTM  18      -  NE 144 RESET 2                           063 30 17.9
 HV7700
 HV7700_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2749707326(NAD 83)
 HV7700
 HV7700|---------------------------------------------------------------------|
 HV7700| PID    Reference Object                     Distance      Geod. Az  |
 HV7700|                                                           dddmmss.s |
 HV7700| HV1485 NE 144 RESET 2                      APPROX. 0.5 KM 0621520.1 |
 HV7700|---------------------------------------------------------------------|
 HV7700
 HV7700                          SUPERSEDED SURVEY CONTROL
 HV7700
 HV7700  NAD 83(1991)-  38 53 52.40861(N)    076 59 21.08498(W) AD(       ) 2
 HV7700  NAD 83(1986)-  38 53 52.40782(N)    076 59 21.09576(W) AD(       ) 2
 HV7700  NAD 27      -  38 53 52.00710(N)    076 59 22.18060(W) AD(       ) 2
 HV7700
 HV7700.Superseded values are not recommended for survey control.
 HV7700
 HV7700.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7700.See file dsdata.pdf to determine how the superseded data were derived.
 HV7700
 HV7700_MARKER: Z = SEE DESCRIPTION
 HV7700_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV7700_SP_SET: SIDEWALK
 HV7700_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV7700_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7700
 HV7700  HISTORY     - Date     Condition        Report By
 HV7700  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7700  HISTORY     - 1971     GOOD             NGS
 HV7700  HISTORY     - 1973     GOOD             NGS
 HV7700  HISTORY     - 19800618 GOOD             NGS
 HV7700
 HV7700                          STATION DESCRIPTION
 HV7700
 HV7700'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7700'THE STATION MARK IS AN IRON PIPE WITH A BRASS SCREW IN THE CENTER,
 HV7700'SET IN THE SIDEWALK.
 HV7700
 HV7700                          STATION RECOVERY (1971)
 HV7700
 HV7700'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7700'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE
 HV7700'ORIGINAL DESCRIPTION IS ADEQUATE, WITH THE FOLLOWING
 HV7700'ADDITIONS--STATION IS IN CORNER OF SIDEWALK, 5.9 FEET NORTH OF
 HV7700'NORTH CURB OF MARYLAND AVE., ON LINE BETWEEN HOMES, ADDRESS 1226
 HV7700'AND 1228, AND 1 INCH BENEATH GROUND LEVEL.
 HV7700'
 HV7700'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7700'IN DISTRICT OF COLUMBIA.
 HV7700
 HV7700                          STATION RECOVERY (1973)
 HV7700
 HV7700'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1973 (CLN)
 HV7700'THE STATION WAS RECOVERED AND FOUND IN GOOD CONDITION AS DESCRIBED
 HV7700'IN THE 1960 DESCRIPTION.  THIS STATION WAS USED AS AN AZIMUTH FROM
 HV7700'TRIANGULATION STATION NE 144 RESET 1960, WHEN TRIANGULATION
 HV7700'STATION NE 144 RESET 2 WAS ESTABLISHED.
 HV7700'
 HV7700'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7700'IN NE SECTION OF DIST. OF COL.
 HV7700
 HV7700                          STATION RECOVERY (1980)
 HV7700
 HV7700'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1980 (RGP)
 HV7700'RECOVERED IN GOOD CONDITION AS DESCRIBED.  THIS STATION WAS NOT
 HV7700'OCCUPIED AT THIS DATE BUT IT WAS INTERSECTED FROM STATION NE 144 RESET
 HV7700'2 1973.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7729 ***********************************************************************
 HV7729  DESIGNATION -  NE 144 A RESET
 HV7729  PID         -  HV7729
 HV7729  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7729  COUNTRY     -  US
 HV7729  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7729
 HV7729                         *CURRENT SURVEY CONTROL
 HV7729  ______________________________________________________________________
 HV7729* NAD 83(1993) POSITION- 38 53 57.19015(N) 076 58 44.61662(W)   ADJUSTED
 HV7729* NAVD 88 ORTHO HEIGHT -    13.5   (meters)       44.    (feet) VERTCON3
 HV7729  ______________________________________________________________________
 HV7729  GEOID HEIGHT    -        -32.166 (meters)                     GEOID18
 HV7729  LAPLACE CORR    -         -4.03  (seconds)                    DEFLEC18
 HV7729  HORZ ORDER      -  SECOND
 HV7729
 HV7729.The horizontal coordinates were established by classical geodetic methods
 HV7729.and adjusted by the National Geodetic Survey in November 1994.
 HV7729
 HV7729.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV7729.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV7729
 HV7729.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7729.GEOID18 height accuracy estimate available here.
 HV7729
 HV7729.Click photographs - Photos may exist for this station.
 HV7729
 HV7729.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7729
 HV7729. The following values were computed from the NAD 83(1993) position.
 HV7729
 HV7729;                    North         East     Units Scale Factor Converg.
 HV7729;SPC MD       -   136,818.866   401,816.421   MT  0.99994993   +0 00 47.3
 HV7729;SPC MD       -   448,879.90  1,318,292.71   sFT  0.99994993   +0 00 47.3
 HV7729;SPC VA N     - 2,137,906.402 3,631,928.993   MT  0.99996044   +0 56 57.3
 HV7729;SPC VA N     - 7,014,114.59 11,915,753.70   sFT  0.99996044   +0 56 57.3
 HV7729;UTM  18      - 4,307,454.609   328,379.579   MT  0.99996269   -1 14 35.0
 HV7729
 HV7729!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7729!SPC MD       -   1.00000293  x   0.99994993  =   0.99995286
 HV7729!SPC VA N     -   1.00000293  x   0.99996044  =   0.99996337
 HV7729!UTM  18      -   1.00000293  x   0.99996269  =   0.99996562
 HV7729
 HV7729:                Primary Azimuth Mark                     Grid Az
 HV7729:SPC MD       -  NE 144 B 2                               098 55 15.9
 HV7729:SPC VA N     -  NE 144 B 2                               097 59 05.9
 HV7729:UTM  18      -  NE 144 B 2                               100 10 38.2
 HV7729
 HV7729_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2837907454(NAD 83)
 HV7729
 HV7729|---------------------------------------------------------------------|
 HV7729| PID    Reference Object                     Distance      Geod. Az  |
 HV7729|                                                           dddmmss.s |
 HV7729| HV8135 NE 144 B 2                          447.673 METERS 0985603.2 |
 HV7729| CX3537 NE 144 A RESET RM 2                   9.293 METERS 09901     |
 HV7729| HV8136 NE 144 A RESET RM 1                  31.685 METERS 35408     |
 HV7729|---------------------------------------------------------------------|
 HV7729
 HV7729                          SUPERSEDED SURVEY CONTROL
 HV7729
 HV7729  NAD 83(1991)-  38 53 57.18889(N)    076 58 44.61772(W) AD(       ) 2
 HV7729  NAD 83(1986)-  38 53 57.18800(N)    076 58 44.62837(W) AD(       ) 2
 HV7729  NAD 27      -  38 53 56.78690(N)    076 58 45.71410(W) AD(       ) 2
 HV7729  NGVD 29 (07/19/86)   13.7    (m)           45.     (f) VERT ANG       
 HV7729
 HV7729.Superseded values are not recommended for survey control.
 HV7729
 HV7729.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7729.See file dsdata.pdf to determine how the superseded data were derived.
 HV7729
 HV7729_MARKER: DS = TRIANGULATION STATION DISK
 HV7729_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV7729_SP_SET: SIDEWALK
 HV7729_STAMPING: DCHWY CGS 144 A RESET 1964
 HV7729_MARK LOGO: CGS
 HV7729_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV7729_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7729
 HV7729  HISTORY     - Date     Condition        Report By
 HV7729  HISTORY     - 1964     MONUMENTED       CGS
 HV7729  HISTORY     - 1971     GOOD             NGS
 HV7729  HISTORY     - 19800618 GOOD             NGS
 HV7729  HISTORY     - 20070421 MARK NOT FOUND   GEOCAC
 HV7729
 HV7729                          STATION DESCRIPTION
 HV7729
 HV7729'DESCRIBED BY COAST AND GEODETIC SURVEY 1964 (ELH)
 HV7729'THE STATION IS LOCATED ON 17TH AND BENNING NORTHEAST, IN
 HV7729'WASHINGTON D.C.
 HV7729'
 HV7729'THE STATION IS A STANDARD DISK STAMPED DC HWY. C AND GS 144 A
 HV7729'RESET, SET IN A DRILL HOLE IN A SIDE WALK, THAT IS FLUSH WITH
 HV7729'THE GROUND SURFACE.  IT IS 7.0 FEET SOUTH OF THE CURBING.  63.6
 HV7729'FEET EAST OF EAST CURB OF 17TH STREET.  4.8 FEET SOUTH OF
 HV7729'TELEPHONE POLE IN BETWEEN DUAL DRIVEWAYS TO AMOCO STATION.
 HV7729
 HV7729                          STATION RECOVERY (1971)
 HV7729
 HV7729'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7729'THIS MARK WAS RECOVERED IN THE VICINITY OF NE 144 A.  IT IS A
 HV7729'STANDARD USC AND GS STATION DISK, STAMPED DC HWY C AND GS 144 A
 HV7729'RESET 1964, AND IS CEMENTED IN A DRILL HOLE IN CONCRETE SIDEWALK,
 HV7729'7.2 FEET SOUTH OF SOUTH CURB OF BENNING STREET, 11.5 FEET WEST
 HV7729'OF CENTER OF A LARGE MANHOLE COVER, 1 FOOT SOUTH OF NORTH EDGE
 HV7729'OF SIDEWALK, AND 4.4 FEET EAST OF EAST EDGE OF THE WEST ENTRANCE
 HV7729'DRIVE TO THE AMERICAN SERVICE STATION.
 HV7729'
 HV7729'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7729'IN DISTRICT OF COLUMBIA.
 HV7729
 HV7729                          STATION RECOVERY (1980)
 HV7729
 HV7729'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1980 (CLN)
 HV7729'THE STATION AND ALL MARKS WERE RECOVERED AND FOUND IN GOOD CONDITION
 HV7729'AS DESCRIBED.
 HV7729
 HV7729                          STATION RECOVERY (2007)
 HV7729
 HV7729'RECOVERY NOTE BY GEOCACHING 2007 (APC)
 HV7729'MARK NOT FOUND. APARTMENT BUILDING OBSERVED AT THE DESCRIBED LOCATION
 HV7729'OF SERVICE STATION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7689 ***********************************************************************
 HV7689  DESIGNATION -  NE 144 AZ MK
 HV7689  PID         -  HV7689
 HV7689  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7689  COUNTRY     -  US
 HV7689  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7689
 HV7689                         *CURRENT SURVEY CONTROL
 HV7689  ______________________________________________________________________
 HV7689* NAD 83(1993) POSITION- 38 54 03.92923(N) 076 58 50.94765(W)   ADJUSTED
 HV7689* NAVD 88 ORTHO HEIGHT -    18.4   (meters)       60.    (feet) VERTCON3
 HV7689  ______________________________________________________________________
 HV7689  GEOID HEIGHT    -        -32.159 (meters)                     GEOID18
 HV7689  LAPLACE CORR    -         -4.04  (seconds)                    DEFLEC18
 HV7689  HORZ ORDER      -  SECOND
 HV7689
 HV7689.The horizontal coordinates were established by classical geodetic methods
 HV7689.and adjusted by the National Geodetic Survey in November 1994.
 HV7689
 HV7689.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV7689.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV7689
 HV7689.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7689.GEOID18 height accuracy estimate available here.
 HV7689
 HV7689.Click photographs - Photos may exist for this station.
 HV7689
 HV7689.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7689
 HV7689. The following values were computed from the NAD 83(1993) position.
 HV7689
 HV7689;                    North         East     Units Scale Factor Converg.
 HV7689;SPC MD       -   137,026.636   401,663.827   MT  0.99994994   +0 00 43.3
 HV7689;SPC MD       -   449,561.55  1,317,792.07   sFT  0.99994994   +0 00 43.3
 HV7689;SPC VA N     - 2,138,111.653 3,631,773.023   MT  0.99996060   +0 56 53.3
 HV7689;SPC VA N     - 7,014,787.98 11,915,241.99   sFT  0.99996060   +0 56 53.3
 HV7689;UTM  18      - 4,307,665.677   328,231.574   MT  0.99996332   -1 14 39.2
 HV7689
 HV7689!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7689!SPC MD       -   1.00000216  x   0.99994994  =   0.99995210
 HV7689!SPC VA N     -   1.00000216  x   0.99996060  =   0.99996276
 HV7689!UTM  18      -   1.00000216  x   0.99996332  =   0.99996548
 HV7689
 HV7689_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2823107665(NAD 83)
 HV7689
 HV7689                          SUPERSEDED SURVEY CONTROL
 HV7689
 HV7689  NAD 83(1991)-  38 54 03.92798(N)    076 58 50.94875(W) AD(       ) 2
 HV7689  NAD 83(1986)-  38 54 03.92704(N)    076 58 50.95944(W) AD(       ) 2
 HV7689  NAD 27      -  38 54 03.52616(N)    076 58 52.04572(W) AD(       ) 2
 HV7689  NGVD 29 (07/19/86)   18.6    (m)           61.     (f) VERT ANG       
 HV7689
 HV7689.Superseded values are not recommended for survey control.
 HV7689
 HV7689.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7689.See file dsdata.pdf to determine how the superseded data were derived.
 HV7689
 HV7689_MARKER: DD = SURVEY DISK
 HV7689_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV7689_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV7689_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7689
 HV7689  HISTORY     - Date     Condition        Report By
 HV7689  HISTORY     - 1960     MONUMENTED       DCDHT
 HV7689  HISTORY     - 19800618 GOOD             NGS
 HV7689
 HV7689                          STATION DESCRIPTION
 HV7689
 HV7689'DESCRIBED BY DC DEPARTMENT OF HIGHWAYS AND TRAFFIC 1960
 HV7689'THE AZIMUTH MARK IS A DISTRICT OF COLUMBIA HIGHWAY DEPARTMENT
 HV7689'DISK SET IN THE TOP OF A 12-INCH SQUARE CONCRETE MONUMENT WHICH
 HV7689'IS 6-INCHES BELOW THE SURFACE.  THE DISK IS STAMPED U.S.C. AND
 HV7689'G.S. NO 144 AZ.  THERE IS A 14-INCH IRON MANHOLE COVER PLACED
 HV7689'OVER THE DISK TO PROTECT IT.  THE MANHOLE COVER HAS SURVEY
 HV7689'STAMPED ON THE TOP.
 HV7689'
 HV7689'TO REACH THE AZIMUTH MARK FROM THE STATION, GO NORTHEAST ON
 HV7689'MARYLAND AVENUE N.E. FOR 1/4 MILE TO A LOADING RAMP FOR THE
 HV7689'HECHINGER COMPANY ON THE RIGHT AND THE AZIMUTH MARK 30 FEET
 HV7689'NORTHWEST OF THE LOADING RAMP, 6 FEET SOUTHWEST OF THE CENTER OF
 HV7689
 HV7689                          STATION RECOVERY (1980)
 HV7689
 HV7689'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1980 (RGP)
 HV7689'RECOVERED AS DESCRIBED IN GOOD CONDITION.  IT WILL SOON BE DESTROYED
 HV7689'BY CONSTRUCTION.  A NEW STATION NE 144 RESET 2 1973 AZ 2 1980 WAS
 HV7689'ESTABLISHED.  SEE DESCRIPTION THEREOF.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8135 ***********************************************************************
 HV8135  DESIGNATION -  NE 144 B 2
 HV8135  PID         -  HV8135
 HV8135  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8135  COUNTRY     -  US
 HV8135  USGS QUAD   -  WASHINGTON EAST (2016)
 HV8135
 HV8135                         *CURRENT SURVEY CONTROL
 HV8135  ______________________________________________________________________
 HV8135* NAD 83(1993) POSITION- 38 53 54.93520(N) 076 58 26.26421(W)   ADJUSTED
 HV8135* NAVD 88 ORTHO HEIGHT -    16.8   (meters)       55.    (feet) VERTCON3
 HV8135  ______________________________________________________________________
 HV8135  GEOID HEIGHT    -        -32.179 (meters)                     GEOID18
 HV8135  LAPLACE CORR    -         -4.06  (seconds)                    DEFLEC18
 HV8135  HORZ ORDER      -  SECOND
 HV8135
 HV8135.The horizontal coordinates were established by classical geodetic methods
 HV8135.and adjusted by the National Geodetic Survey in November 1994.
 HV8135
 HV8135.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV8135.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV8135
 HV8135.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8135.GEOID18 height accuracy estimate available here.
 HV8135
 HV8135.Click photographs - Photos may exist for this station.
 HV8135
 HV8135.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV8135
 HV8135. The following values were computed from the NAD 83(1993) position.
 HV8135
 HV8135;                    North         East     Units Scale Factor Converg.
 HV8135;SPC MD       -   136,749.448   402,258.657   MT  0.99994993   +0 00 58.8
 HV8135;SPC MD       -   448,652.15  1,319,743.61   sFT  0.99994993   +0 00 58.8
 HV8135;SPC VA N     - 2,137,844.216 3,632,372.309   MT  0.99996039   +0 57 08.7
 HV8135;SPC VA N     - 7,013,910.57 11,917,208.15   sFT  0.99996039   +0 57 08.7
 HV8135;UTM  18      - 4,307,375.511   328,820.191   MT  0.99996083   -1 14 23.4
 HV8135
 HV8135!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV8135!SPC MD       -   1.00000242  x   0.99994993  =   0.99995235
 HV8135!SPC VA N     -   1.00000242  x   0.99996039  =   0.99996281
 HV8135!UTM  18      -   1.00000242  x   0.99996083  =   0.99996325
 HV8135
 HV8135:                Primary Azimuth Mark                     Grid Az
 HV8135:SPC MD       -  NE 144 C 2                               106 37 48.4
 HV8135:SPC VA N     -  NE 144 C 2                               105 41 38.5
 HV8135:UTM  18      -  NE 144 C 2                               107 53 10.6
 HV8135
 HV8135_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2882007375(NAD 83)
 HV8135
 HV8135|---------------------------------------------------------------------|
 HV8135| PID    Reference Object                     Distance      Geod. Az  |
 HV8135|                                                           dddmmss.s |
 HV8135| CX3538 NE 144 B 2 RM 1                       8.824 METERS 08258     |
 HV8135| HV8137 NE 144 C 2                          408.215 METERS 1063847.2 |
 HV8135| HV7729 NE 144 A RESET                      447.673 METERS 2785614.7 |
 HV8135| CX3539 NE 144 B 2 RM 2                      14.548 METERS 30227     |
 HV8135|---------------------------------------------------------------------|
 HV8135
 HV8135                          SUPERSEDED SURVEY CONTROL
 HV8135
 HV8135  NAD 83(1991)-  38 53 54.93393(N)    076 58 26.26532(W) AD(       ) 2
 HV8135  NAD 83(1986)-  38 53 54.93305(N)    076 58 26.27594(W) AD(       ) 2
 HV8135  NAD 27      -  38 53 54.53213(N)    076 58 27.36243(W) AD(       ) 2
 HV8135  NGVD 29 (07/19/86)   17.0    (m)           56.     (f) VERT ANG       
 HV8135
 HV8135.Superseded values are not recommended for survey control.
 HV8135
 HV8135.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8135.See file dsdata.pdf to determine how the superseded data were derived.
 HV8135
 HV8135_MARKER: Z = SEE DESCRIPTION
 HV8135_SETTING: 0 = UNSPECIFIED SETTING
 HV8135_MARK LOGO: NGS
 HV8135_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV8135_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV8135
 HV8135  HISTORY     - Date     Condition        Report By
 HV8135  HISTORY     - 1979     MONUMENTED       NGS
 HV8135  HISTORY     - 19800618 GOOD             NGS
 HV8135
 HV8135                          STATION DESCRIPTION
 HV8135
 HV8135'DESCRIBED BY NATIONAL GEODETIC SURVEY 1980 (CLN)
 HV8135'THE STATION AND ALL MARKS WRE RECOVERED AND FOUND IN GOOD CONDITION AS
 HV8135'DESCRIBED.  THIS STATION WAS NOT OCCUPIED AT THIS DATE, HOWEVER, IT
 HV8135'WAS INTERSECTED FROM STATION NE 144 A RESET 1964.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1484 ***********************************************************************
 HV1484  DESIGNATION -  NE 144 C MADHOP
 HV1484  PID         -  HV1484
 HV1484  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1484  COUNTRY     -  US
 HV1484  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1484
 HV1484                         *CURRENT SURVEY CONTROL
 HV1484  ______________________________________________________________________
 HV1484* NAD 83(1993) POSITION- 38 53 51.13028(N) 076 58 10.04948(W)   ADJUSTED
 HV1484* NAVD 88 ORTHO HEIGHT -     7.333 (meters)       24.06  (feet) ADJUSTED
 HV1484  ______________________________________________________________________
 HV1484  GEOID HEIGHT    -        -32.190 (meters)                     GEOID18
 HV1484  LAPLACE CORR    -         -4.03  (seconds)                    DEFLEC18
 HV1484  DYNAMIC HEIGHT  -          7.329 (meters)       24.05  (feet) COMP
 HV1484  MODELED GRAVITY -    980,098.0   (mgal)                       NAVD 88
 HV1484
 HV1484  HORZ ORDER      -  SECOND
 HV1484  VERT ORDER      -  SECOND    CLASS 0
 HV1484
 HV1484.The horizontal coordinates were established by classical geodetic methods
 HV1484.and adjusted by the National Geodetic Survey in November 1994.
 HV1484
 HV1484.The orthometric height was determined by differential leveling and
 HV1484.adjusted by the NATIONAL GEODETIC SURVEY
 HV1484.in June 1991.
 HV1484
 HV1484.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1484.GEOID18 height accuracy estimate available here.
 HV1484
 HV1484.Click photographs - Photos may exist for this station.
 HV1484
 HV1484.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1484
 HV1484.The dynamic height is computed by dividing the NAVD 88
 HV1484.geopotential number by the normal gravity value computed on the
 HV1484.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1484.degrees latitude (g = 980.6199 gals.).
 HV1484
 HV1484.The modeled gravity was interpolated from observed gravity values.
 HV1484
 HV1484. The following values were computed from the NAD 83(1993) position.
 HV1484
 HV1484;                    North         East     Units Scale Factor Converg.
 HV1484;SPC MD       -   136,632.242   402,649.406   MT  0.99994992   +0 01 09.0
 HV1484;SPC MD       -   448,267.61  1,321,025.59   sFT  0.99994992   +0 01 09.0
 HV1484;SPC VA N     - 2,137,733.409 3,632,764.925   MT  0.99996030   +0 57 18.9
 HV1484;SPC VA N     - 7,013,547.03 11,918,496.26   sFT  0.99996030   +0 57 18.9
 HV1484;UTM  18      - 4,307,249.766   329,208.281   MT  0.99995920   -1 14 13.1
 HV1484
 HV1484!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1484!SPC MD       -   1.00000390  x   0.99994992  =   0.99995382
 HV1484!SPC VA N     -   1.00000390  x   0.99996030  =   0.99996420
 HV1484!UTM  18      -   1.00000390  x   0.99995920  =   0.99996310
 HV1484
 HV1484_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2920807249(NAD 83)
 HV1484
 HV1484|---------------------------------------------------------------------|
 HV1484| PID    Reference Object                     Distance      Geod. Az  |
 HV1484|                                                           dddmmss.s |
 HV1484| HV1483 NE 145 DCDHT                        310.261 METERS 09549     |
 HV1484| HV7718 N E 144 B 1960                      378.509 METERS 28236     |
 HV1484|---------------------------------------------------------------------|
 HV1484
 HV1484                          SUPERSEDED SURVEY CONTROL
 HV1484
 HV1484  NAD 83(1991)-  38 53 51.12901(N)    076 58 10.05059(W) AD(       ) 2
 HV1484  NAD 83(1986)-  38 53 51.12812(N)    076 58 10.06110(W) AD(       ) 2
 HV1484  NAD 27      -  38 53 50.72730(N)    076 58 11.14850(W) AD(       ) 2
 HV1484  NGVD 29               7.57   (m)           24.8    (f) LEVELING    3  
 HV1484  NGVD 29 (11/26/84)    7.568  (m)           24.83   (f) ADJUSTED    2 0
 HV1484
 HV1484.Superseded values are not recommended for survey control.
 HV1484
 HV1484.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1484.See file dsdata.pdf to determine how the superseded data were derived.
 HV1484
 HV1484_MARKER: Z = SEE DESCRIPTION
 HV1484_SETTING: 0 = UNSPECIFIED SETTING
 HV1484_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1484
 HV1484  HISTORY     - Date     Condition        Report By
 HV1484  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1484  HISTORY     - 1960     GOOD             MADHOP
 HV1484  HISTORY     - 1971     GOOD             NGS
 HV1484  HISTORY     - 20070421 MARK NOT FOUND   GEOCAC
 HV1484
 HV1484                          STATION DESCRIPTION
 HV1484
 HV1484'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1484'THE STATION MARK IS AN IRON PIPE WITH A BRASS SCREW IN THE CENTER,
 HV1484'SET IN THE SIDEWALK.
 HV1484
 HV1484                          STATION RECOVERY (1960)
 HV1484
 HV1484'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1484'IN DC.
 HV1484'LOCATED NEAR INTERSECTION OF BENNING RD. N.E. AND OKLAHOMA AVE.
 HV1484'N.E. 55.88 FT SOUTHEAST OF CROSS CUT IN RIM OF MANHOLE ON WEST
 HV1484'SIDE OF INTERSECTION, AND 58.10 FT SOUTH OF CROSS CUT IN MANHOLE
 HV1484'RIM ON EAST SIDE OF INTERSECTION, AND 5.89 FT SOUTHWEST OF CROSS
 HV1484'CUT IN MANHOLE RIM.  A PIPE AND SCREW ADJACENT TO CONCRETE WALK.
 HV1484
 HV1484                          STATION RECOVERY (1971)
 HV1484
 HV1484'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1484'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE ORIGINAL
 HV1484'DESCRIPTION IS ADEQUATE.
 HV1484'
 HV1484'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV1484'IN DISTRICT OF COLUMBIA.
 HV1484
 HV1484                          STATION RECOVERY (2007)
 HV1484
 HV1484'RECOVERY NOTE BY GEOCACHING 2007 (APC)
 HV1484'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1485 ***********************************************************************
 HV1485  DESIGNATION -  NE 144 RESET 2
 HV1485  PID         -  HV1485
 HV1485  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1485  COUNTRY     -  US
 HV1485  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1485
 HV1485                         *CURRENT SURVEY CONTROL
 HV1485  ______________________________________________________________________
 HV1485* NAD 83(1993) POSITION- 38 54 00.13375(N) 076 59 02.29113(W)   ADJUSTED
 HV1485* NAVD 88 ORTHO HEIGHT -    13.36  (+/-2cm)       43.8   (feet) VERTCON3
 HV1485  ______________________________________________________________________
 HV1485  GEOID HEIGHT    -        -32.155 (meters)                     GEOID18
 HV1485  LAPLACE CORR    -         -3.97  (seconds)                    DEFLEC18
 HV1485  HORZ ORDER      -  SECOND
 HV1485  VERT ORDER      -  THIRD (See Below)
 HV1485
 HV1485.The horizontal coordinates were established by classical geodetic methods
 HV1485.and adjusted by the National Geodetic Survey in November 1994.
 HV1485
 HV1485.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1485.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1485
 HV1485.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1485.GEOID18 height accuracy estimate available here.
 HV1485
 HV1485.The vertical order pertains to the NGVD 29 superseded value.
 HV1485
 HV1485.Click photographs - Photos may exist for this station.
 HV1485
 HV1485.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1485
 HV1485. The following values were computed from the NAD 83(1993) position.
 HV1485
 HV1485;                    North         East     Units Scale Factor Converg.
 HV1485;SPC MD       -   136,909.548   401,390.524   MT  0.99994994   +0 00 36.2
 HV1485;SPC MD       -   449,177.41  1,316,895.41   sFT  0.99994994   +0 00 36.2
 HV1485;SPC VA N     - 2,137,990.114 3,631,501.667   MT  0.99996051   +0 56 46.3
 HV1485;SPC VA N     - 7,014,389.23 11,914,351.72   sFT  0.99996051   +0 56 46.3
 HV1485;UTM  18      - 4,307,554.607   327,955.766   MT  0.99996449   -1 14 46.2
 HV1485
 HV1485!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1485!SPC MD       -   1.00000295  x   0.99994994  =   0.99995289
 HV1485!SPC VA N     -   1.00000295  x   0.99996051  =   0.99996346
 HV1485!UTM  18      -   1.00000295  x   0.99996449  =   0.99996744
 HV1485
 HV1485:                Primary Azimuth Mark                     Grid Az
 HV1485:SPC MD       -  NE 143 B                                 242 14 55.7
 HV1485:SPC VA N     -  NE 143 B                                 241 18 45.6
 HV1485:UTM  18      -  NE 143 B                                 243 30 18.1
 HV1485
 HV1485_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2795507554(NAD 83)
 HV1485
 HV1485|---------------------------------------------------------------------|
 HV1485| PID    Reference Object                     Distance      Geod. Az  |
 HV1485|                                                           dddmmss.s |
 HV1485| HV7689 NE 144 AZ MK                        297.343 METERS 06649     |
 HV1485| HV8044 NE 144 RESET                          7.823 METERS 06809     |
 HV1485| HV8136 NE 144 A RESET RM 1                 426.795 METERS 0975843.6 |
 HV1485| CX3542 NE 144 RESET 2 RM 1                  13.251 METERS 13836     |
 HV1485| HV7700 NE 143 B                            APPROX. 0.5 KM 2421531.9 |
 HV1485| CX3543 NE 144 RESET 2 RM 2                  13.342 METERS 26643     |
 HV1485|---------------------------------------------------------------------|
 HV1485
 HV1485                          SUPERSEDED SURVEY CONTROL
 HV1485
 HV1485  NAD 83(1991)-  38 54 00.13251(N)    076 59 02.29223(W) AD(       ) 2
 HV1485  NAD 83(1986)-  38 54 00.13167(N)    076 59 02.30285(W) AD(       ) 2
 HV1485  NAD 27      -  38 53 59.73066(N)    076 59 03.38892(W) AD(       ) 2
 HV1485  NGVD 29 (??/??/??)   13.59   (m)           44.6    (f) RESET       3  
 HV1485  NGVD 29              13.59   (m)           44.6    (f) LEVELING    3  
 HV1485
 HV1485.Superseded values are not recommended for survey control.
 HV1485
 HV1485.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1485.See file dsdata.pdf to determine how the superseded data were derived.
 HV1485
 HV1485_MARKER: DD = SURVEY DISK
 HV1485_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1485_STAMPING: NE 144 RESET 2 1973
 HV1485_MARK LOGO: NGS
 HV1485_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV1485_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1485+STABILITY: SURFACE MOTION
 HV1485
 HV1485  HISTORY     - Date     Condition        Report By
 HV1485  HISTORY     - 1973     MONUMENTED       NGS
 HV1485  HISTORY     - 1973     GOOD             NGS
 HV1485  HISTORY     - 19800618 GOOD             NGS
 HV1485
 HV1485                          STATION DESCRIPTION
 HV1485
 HV1485'DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 (CLN)
 HV1485'THE STATION IS LOCATED AT THE INTERSECTION OF BLADENSBURG ROAD
 HV1485'N.E., MARYLAND AVENUE N.E., 15TH STREET N.E. AND H STREET N.E. IN
 HV1485'THE NORTHEAST SECTION OF THE DISTRICT OF COLUMBIA.  IT IS IN A
 HV1485'SMALL CONCRETE ISLAND BETWEEN H STREET N.E. AND MARYLAND AVENUE
 HV1485'N.E.  THE PROPERTY IS OWNED BY THE DISTRICT OF COLUMBIA.
 HV1485'
 HV1485'THE STATION MARK IS A STANDARD DISK STAMPED NE 144 RESET 2
 HV1485'1973, SET IN THE TOP OF A 10-INCH ROUND CONCRETE MONUMENT WHICH
 HV1485'IS 1 FOOT BELOW THE SURFACE OF THE CONCRETE ISLAND.  THE STATION
 HV1485'MARK IS COVERED BY A 14-INCH SQUARE STEEL MANHOLE COVER WITH
 HV1485'SURVEY STAMPED IN LARGE LETTERS ON THE TOP OF THE LID.  IT IS 32
 HV1485'FEET SOUTHWEST OF A SIGN MARYLAND H ST., 19 FEET NORTHEAST OF
 HV1485'THE CENTER OF A MANHOLE AND 13 FEET NORTHWEST OF THE NORTHWEST
 HV1485'CURB OF MARYLAND AVENUE N.E.
 HV1485'
 HV1485'REFERENCE MARK ONE IS A STANDARD DISK STAMPED NE 144 RESET 2 NO
 HV1485'1 1973, CEMENTED IN A DRILL HOLE IN THE CONCRETE ISLAND IN THE
 HV1485'CENTER OF MARYLAND AVENUE N.E.  IT IS 10 FEET SOUTHWEST OF THE
 HV1485'NORTHEAST EDGE OF THE CONCRETE ISLAND AND IT PROJECTS 6 INCHES
 HV1485'ABOVE THE ROAD.
 HV1485'
 HV1485'REFERENCE MARK TWO IS A STANDARD DISK STAMPED NE 144 RESET 2
 HV1485'NO 2 1973, CEMENTED IN A DRILL HOLE IN THE SIDEWALK ON THE SOUTHWEST
 HV1485'SIDE OF A SMALL CIRCLE DRIVE BETWEEN MARYLAND AVENUE N.E. AND H
 HV1485'STREET N.E.  IT IS 6 FEET SOUTHWEST OF THE NORTHEAST EDGE OF
 HV1485'THE CURB ON THE SOUTHWEST SIDE OF THE DRIVE AND IS ABOUT 6 INCHES
 HV1485'HIGHER THAN THE ROAD.
 HV1485'
 HV1485'THE AZIMUTH MARK IS A DISTRICT OF COLUMBIA HIGHWAY DEPARTMENT
 HV1485'DISK SET IN THE TOP OF A 12-INCH SQUARE CONCRETE MONUMENT WHICH
 HV1485'IS 6-INCHES BELOW THE SURFACE.  THE DISK IS STAMPED U.S.C. AND
 HV1485'G.S. NO 144 AZ.  THERE IS A 14-INCH IRON MANHOLE COVER PLACED
 HV1485'OVER THE DISK TO PROTECT IT.  THE MANHOLE COVER HAS SURVEY
 HV1485'STAMPED ON THE TOP.
 HV1485'
 HV1485'TO REACH THE AZIMUTH MARK FROM THE STATION, GO NORTHEAST ON
 HV1485'MARYLAND AVENUE N.E. FOR 1/4 MILE TO A LOADING RAMP FOR THE
 HV1485'HECHINGER COMPANY ON THE RIGHT AND THE AZIMUTH MARK 30 FEET
 HV1485'NORTHWEST OF THE LOADING RAMP, 6 FEET SOUTHWEST OF THE CENTER OF
 HV1485'A DRIVE LEADING TO THE RAMP AND 2 FEET SOUTH OF THE CURB ON THE
 HV1485'SOUTH SIDE OF MARYLAND AVENUE N.E.
 HV1485
 HV1485                          STATION RECOVERY (1973)
 HV1485
 HV1485'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1973
 HV1485'IN DC.
 HV1485'THE STATION IS LOCATED AT THE INTERSECTION OF BLADENSBURG ROAD
 HV1485'N.E., MARYLAND AVENUE N.E., 15TH. STREET N.E. AND H STREET N.E. IN
 HV1485'THE NORTHEAST SECTION OF THE DISTRICT OF COLUMBIA.  IT IS IN A SMALL
 HV1485'CONCRETE ISLAND BETWEEN H STREET N.E. AND MARYLAND AVENUE N.E.
 HV1485'SET IN THE TOP OF A 10-INCH ROUND CONCRETE MONUMENT WHICH IS 1
 HV1485'FOOT BELOW THE SURFACE OF THE CONCRETE ISLAND.  THE STATION MARK
 HV1485'IS COVERED BY A 14-INCH SQUARE MANHOLE COVER WITH SURVEY STAMPED
 HV1485'IN LARGE LETTERS ON THE TOP OF THE LID.  32 FEET SOUTHWEST OF A
 HV1485'SIGN MARYLAND H ST., 19 FEET NORTHEAST OF THE CENTER OF A MANHOLE,
 HV1485'13 FEET NORTHWEST OF THE NORTHWEST CURB OF MARYLAND AVENUE N.E.,
 HV1485'43.77 FEET NORTHEAST OF RM 2, 43.47 FEET NORTHWEST OF RM 1.
 HV1485
 HV1485                          STATION RECOVERY (1980)
 HV1485
 HV1485'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1980 (RGP)
 HV1485'THE STATION AND ALL MARKS WERE RECOVERED AND FOUND IN GOOD CONDITION
 HV1485'AS DESCRIBED.  IT IS POSSIBLE THAT REFERENCE MARK ONE MAY HAVE BEEN
 HV1485'HIT DURING CONSTRUCTION BUT IT IS SOLID AND IN VERY GOOD CONDITION. A
 HV1485'LONGER DISTANCE OF 0.07 FT (2.13 CM) OR 0.021 METER (0.069 FT) AND A
 HV1485'DIFFERENCE OF 14 MINUTES AND 48 SECONDS IN DIRECTION WAS NOTED TO
 HV1485'REFERENCE MARK ONE.  THE 1960 AZ MK WAS IN DANGER OF DESTRUCTION BY A
 HV1485'NEW SHOPPING CENTER WHICH IS BEING CONSTRUCTED ALONG MARYLAND AVENUE.
 HV1485'A NEW STATION --NE 144 RESET 2 1973 AZ 2 1980 -- WAS ESTABLISHED.  SEE
 HV1485'DESCRIPTION THEREOF.  NO NEW DESCRIPTION OF THIS STATION IS REQUIRED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1483 ***********************************************************************
 HV1483  TIDAL BM    -  This is a Tidal Bench Mark.
 HV1483  DESIGNATION -  NE 145 DCDHT
 HV1483  PID         -  HV1483
 HV1483  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1483  COUNTRY     -  US
 HV1483  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1483
 HV1483                         *CURRENT SURVEY CONTROL
 HV1483  ______________________________________________________________________
 HV1483* NAD 83(1993) POSITION- 38 53 50.11185(N) 076 57 57.24044(W)   ADJUSTED
 HV1483* NAVD 88 ORTHO HEIGHT -     3.785 (meters)       12.42  (feet) ADJUSTED
 HV1483  ______________________________________________________________________
 HV1483  GEOID HEIGHT    -        -32.198 (meters)                     GEOID18
 HV1483  LAPLACE CORR    -         -4.00  (seconds)                    DEFLEC18
 HV1483  DYNAMIC HEIGHT  -          3.783 (meters)       12.41  (feet) COMP
 HV1483  MODELED GRAVITY -    980,097.0   (mgal)                       NAVD 88
 HV1483
 HV1483  HORZ ORDER      -  SECOND
 HV1483  VERT ORDER      -  SECOND    CLASS 0
 HV1483
 HV1483.The horizontal coordinates were established by classical geodetic methods
 HV1483.and adjusted by the National Geodetic Survey in November 1994.
 HV1483
 HV1483.The orthometric height was determined by differential leveling and
 HV1483.adjusted by the NATIONAL GEODETIC SURVEY
 HV1483.in June 1991.
 HV1483
 HV1483.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1483.GEOID18 height accuracy estimate available here.
 HV1483
 HV1483.This Tidal Bench Mark is designated as VM 12741
 HV1483.by the CENTER FOR OPERATIONAL OCEANOGRAPHIC PRODUCTS AND SERVICES.
 HV1483
 HV1483.Click photographs - Photos may exist for this station.
 HV1483
 HV1483.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1483
 HV1483.The dynamic height is computed by dividing the NAVD 88
 HV1483.geopotential number by the normal gravity value computed on the
 HV1483.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1483.degrees latitude (g = 980.6199 gals.).
 HV1483
 HV1483.The modeled gravity was interpolated from observed gravity values.
 HV1483
 HV1483. The following values were computed from the NAD 83(1993) position.
 HV1483
 HV1483;                    North         East     Units Scale Factor Converg.
 HV1483;SPC MD       -   136,600.947   402,958.069   MT  0.99994992   +0 01 17.0
 HV1483;SPC MD       -   448,164.94  1,322,038.26   sFT  0.99994992   +0 01 17.0
 HV1483;SPC VA N     - 2,137,707.161 3,633,074.061   MT  0.99996027   +0 57 26.9
 HV1483;SPC VA N     - 7,013,460.91 11,919,510.48   sFT  0.99996027   +0 57 26.9
 HV1483;UTM  18      - 4,307,211.712   329,516.186   MT  0.99995791   -1 14 05.1
 HV1483
 HV1483!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1483!SPC MD       -   1.00000446  x   0.99994992  =   0.99995438
 HV1483!SPC VA N     -   1.00000446  x   0.99996027  =   0.99996473
 HV1483!UTM  18      -   1.00000446  x   0.99995791  =   0.99996237
 HV1483
 HV1483:                Primary Azimuth Mark                     Grid Az
 HV1483:SPC MD       -  NEW 132 METRO                            093 56 27.4
 HV1483:SPC VA N     -  NEW 132 METRO                            093 00 17.5
 HV1483:UTM  18      -  NEW 132 METRO                            095 11 49.5
 HV1483
 HV1483_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2951607211(NAD 83)
 HV1483
 HV1483|---------------------------------------------------------------------|
 HV1483| PID    Reference Object                     Distance      Geod. Az  |
 HV1483|                                                           dddmmss.s |
 HV1483| HV8134 NEW 132 METRO                       449.847 METERS 0935744.4 |
 HV1483| HV8137 NE 144 C 2                          309.930 METERS 27553     |
 HV1483|---------------------------------------------------------------------|
 HV1483
 HV1483                          SUPERSEDED SURVEY CONTROL
 HV1483
 HV1483  NAD 83(1991)-  38 53 50.11057(N)    076 57 57.24155(W) AD(       ) 2
 HV1483  NAD 83(1986)-  38 53 50.10969(N)    076 57 57.25209(W) AD(       ) 2
 HV1483  NAD 27      -  38 53 49.70900(N)    076 57 58.33980(W) AD(       ) 2
 HV1483  NGVD 29               4.02   (m)           13.2    (f) LEVELING    3  
 HV1483  NGVD 29 (11/26/84)    4.020  (m)           13.19   (f) ADJUSTED    2 0
 HV1483
 HV1483.Superseded values are not recommended for survey control.
 HV1483
 HV1483.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1483.See file dsdata.pdf to determine how the superseded data were derived.
 HV1483
 HV1483_MARKER: DD = SURVEY DISK
 HV1483_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1483_STAMPING: USCGS NO NE 145
 HV1483_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1483+STABILITY: SURFACE MOTION
 HV1483
 HV1483  HISTORY     - Date     Condition        Report By
 HV1483  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1483  HISTORY     - 1960     GOOD             MADHOP
 HV1483  HISTORY     - 1969     GOOD             CGS
 HV1483  HISTORY     - 1971     GOOD             NGS
 HV1483
 HV1483                          STATION DESCRIPTION
 HV1483
 HV1483'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1483'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1483'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO NE 145 SET IN
 HV1483'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1483'COVER WITH LID LABELED SURVEY.
 HV1483
 HV1483                          STATION RECOVERY (1960)
 HV1483
 HV1483'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1483'IN DC.
 HV1483'LOCATED ON BENNING RD. N.E. ON BRIDGE OVER ANACOSTIA RIVER.
 HV1483'27.12 FT WEST OF CROSS CUT IN MANHOLE RIM, AND 51.02 FT EAST OF
 HV1483'CROSS CUT IN MANHOLE RIM LOCATED ON SIDEWALK, AND 35.66 FT SOUTH
 HV1483'OF CROSS CUT IN MANHOLE RIM IN ROADWAY.  A STANDARD BRASS DISC
 HV1483'SET IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV1483'MANHOLE COVER WITH LID LABELED SURVEY.
 HV1483
 HV1483                          STATION RECOVERY (1969)
 HV1483
 HV1483'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1969 (EBK)
 HV1483'STATION FOUND IN GOOD CONDITION, THE MANHOLE COVER HAS BEEN
 HV1483'RE-MOVED FROM AROUND THE MARK.
 HV1483'
 HV1483'THE STATION MARK IS 1 FOOT NORTH OF THE NORTH EDGE OF THE SOUTH
 HV1483'SIDEWALK AND IS ABOUT 2 INCHES UNDERGROUND.
 HV1483
 HV1483                          STATION RECOVERY (1971)
 HV1483
 HV1483'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1483'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE ORIGINAL
 HV1483'DESCRIPTION IS ADEQUATE, WITH THE FOLLOWING ADDITIONS--STATION
 HV1483'MARK IS 8 INCHES BELOW GROUND, AT NORTH EDGE OF SIDEWALK, 7.05
 HV1483'FEET NORTH OF A CROSS IN WEST END OF A CONCRETE CURB.
 HV1483'
 HV1483'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV1483'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1482 ***********************************************************************
 HV1482  DESIGNATION -  NE 146
 HV1482  PID         -  HV1482
 HV1482  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1482  COUNTRY     -  US
 HV1482  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1482
 HV1482                         *CURRENT SURVEY CONTROL
 HV1482  ______________________________________________________________________
 HV1482* NAD 83(1993) POSITION- 38 53 44.94823(N) 076 57 06.06090(W)   ADJUSTED
 HV1482* NAVD 88 ORTHO HEIGHT -    13.219 (meters)       43.37  (feet) ADJUSTED
 HV1482  ______________________________________________________________________
 HV1482  GEOID HEIGHT    -        -32.229 (meters)                     GEOID18
 HV1482  LAPLACE CORR    -         -3.87  (seconds)                    DEFLEC18
 HV1482  DYNAMIC HEIGHT  -         13.211 (meters)       43.34  (feet) COMP
 HV1482  MODELED GRAVITY -    980,092.8   (mgal)                       NAVD 88
 HV1482
 HV1482  HORZ ORDER      -  SECOND
 HV1482  VERT ORDER      -  SECOND    CLASS 0
 HV1482
 HV1482.The horizontal coordinates were established by classical geodetic methods
 HV1482.and adjusted by the National Geodetic Survey in November 1994.
 HV1482
 HV1482.The orthometric height was determined by differential leveling and
 HV1482.adjusted by the NATIONAL GEODETIC SURVEY
 HV1482.in June 1991.
 HV1482
 HV1482.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1482.GEOID18 height accuracy estimate available here.
 HV1482
 HV1482.Click photographs - Photos may exist for this station.
 HV1482
 HV1482.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1482
 HV1482.The dynamic height is computed by dividing the NAVD 88
 HV1482.geopotential number by the normal gravity value computed on the
 HV1482.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1482.degrees latitude (g = 980.6199 gals.).
 HV1482
 HV1482.The modeled gravity was interpolated from observed gravity values.
 HV1482
 HV1482. The following values were computed from the NAD 83(1993) position.
 HV1482
 HV1482;                    North         East     Units Scale Factor Converg.
 HV1482;SPC MD       -   136,442.281   404,191.398   MT  0.99994991   +0 01 49.2
 HV1482;SPC MD       -   447,644.38  1,326,084.61   sFT  0.99994991   +0 01 49.2
 HV1482;SPC VA N     - 2,137,568.662 3,634,309.830   MT  0.99996015   +0 57 58.8
 HV1482;SPC VA N     - 7,013,006.52 11,923,564.83   sFT  0.99996015   +0 57 58.8
 HV1482;UTM  18      - 4,307,026.047   330,745.748   MT  0.99995276   -1 13 32.8
 HV1482
 HV1482!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1482!SPC MD       -   1.00000298  x   0.99994991  =   0.99995289
 HV1482!SPC VA N     -   1.00000298  x   0.99996015  =   0.99996313
 HV1482!UTM  18      -   1.00000298  x   0.99995276  =   0.99995574
 HV1482
 HV1482:                Primary Azimuth Mark                     Grid Az
 HV1482:SPC MD       -  N E 146 D 1960                           220 28 07.3
 HV1482:SPC VA N     -  N E 146 D 1960                           219 31 57.7
 HV1482:UTM  18      -  N E 146 D 1960                           221 43 29.3
 HV1482
 HV1482_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3074507026(NAD 83)
 HV1482
 HV1482|---------------------------------------------------------------------|
 HV1482| PID    Reference Object                     Distance      Geod. Az  |
 HV1482|                                                           dddmmss.s |
 HV1482| HV7665 N E 146 A 1960                      443.871 METERS 0423229.1 |
 HV1482| HV7705 N E 146 D 1960                      APPROX. 0.5 KM 2202956.5 |
 HV1482| CX3519 NE 146 AZ MK                                       2223909.2 |
 HV1482|---------------------------------------------------------------------|
 HV1482
 HV1482                          SUPERSEDED SURVEY CONTROL
 HV1482
 HV1482  NAD 83(1991)-  38 53 44.94693(N)    076 57 06.06201(W) AD(       ) 2
 HV1482  NAD 83(1986)-  38 53 44.94602(N)    076 57 06.07254(W) AD(       ) 2
 HV1482  NAD 27      -  38 53 44.54550(N)    076 57 07.16250(W) AD(       ) 2
 HV1482  NGVD 29              13.45   (m)           44.1    (f) LEVELING    3  
 HV1482  NGVD 29 (11/26/84)   13.453  (m)           44.14   (f) ADJUSTED    2 0
 HV1482
 HV1482.Superseded values are not recommended for survey control.
 HV1482
 HV1482.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1482.See file dsdata.pdf to determine how the superseded data were derived.
 HV1482
 HV1482_MARKER: DD = SURVEY DISK
 HV1482_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1482_STAMPING: USCGS NO NE 146
 HV1482_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1482+STABILITY: SURFACE MOTION
 HV1482
 HV1482  HISTORY     - Date     Condition        Report By
 HV1482  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1482  HISTORY     - 1960     GOOD             MADHOP
 HV1482  HISTORY     - 1971     GOOD             NGS
 HV1482
 HV1482                          STATION DESCRIPTION
 HV1482
 HV1482'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1482'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1482'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO NE 146 SET IN
 HV1482'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1482'COVER WITH LID LABELED SURVEY.
 HV1482'
 HV1482'AZIMUTH MARK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1482'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NE 146-AZ. SET
 HV1482'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV1482'MANHOLE COVER WITH LID LABELED SURVEY.
 HV1482'
 HV1482'NO GEOGRAPHIC POSITION.
 HV1482
 HV1482                          STATION RECOVERY (1960)
 HV1482
 HV1482'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1482'IN DC.
 HV1482'LOCATED IN MEDIAN STRIP OF KENILWORTH AVE. N.E. NEAR WHERE
 HV1482'BENNING ROAD N.E. CROSSES OVER A BRIDGE.  27.71 FT SOUTH OF
 HV1482'CROSS CUT IN LAMP POST BASE, AND 43.16 FT EAST OF CROSS CUT IN
 HV1482'MANHOLE RIM, AND 21.28 FT NORTHEAST OF CROSS CUT IN MANHOLE
 HV1482'RIM.  A STANDARD BRASS DISC SET IN TOP OF 12 IN CONCRETE
 HV1482'MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID LABELED
 HV1482'SURVEY.
 HV1482
 HV1482                          STATION RECOVERY (1971)
 HV1482
 HV1482'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1482'THE STATION AND REFERENCE POINTS RECOVERED IN GOOD CONDITION AS
 HV1482'DESCRIBED.
 HV1482'
 HV1482'NE 146-AZ.  THIS MARK WAS NOT RECOVERED AND EVIDENCE POINT TO
 HV1482'POSSIBILITY OF BEING DESTROYED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1481 ***********************************************************************
 HV1481  DESIGNATION -  NE 147 DCDHT
 HV1481  PID         -  HV1481
 HV1481  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1481  COUNTRY     -  US
 HV1481  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1481
 HV1481                         *CURRENT SURVEY CONTROL
 HV1481  ______________________________________________________________________
 HV1481* NAD 83(1993) POSITION- 38 54 39.83993(N) 076 56 05.73847(W)   ADJUSTED
 HV1481* NAVD 88 ORTHO HEIGHT -    11.789 (meters)       38.68  (feet) ADJUSTED
 HV1481  ______________________________________________________________________
 HV1481  GEOID HEIGHT    -        -32.244 (meters)                     GEOID18
 HV1481  LAPLACE CORR    -         -4.51  (seconds)                    DEFLEC18
 HV1481  DYNAMIC HEIGHT  -         11.783 (meters)       38.66  (feet) COMP
 HV1481  MODELED GRAVITY -    980,093.1   (mgal)                       NAVD 88
 HV1481
 HV1481  HORZ ORDER      -  SECOND
 HV1481  VERT ORDER      -  SECOND    CLASS 0
 HV1481
 HV1481.The horizontal coordinates were established by classical geodetic methods
 HV1481.and adjusted by the National Geodetic Survey in November 1994.
 HV1481
 HV1481.The orthometric height was determined by differential leveling and
 HV1481.adjusted by the NATIONAL GEODETIC SURVEY
 HV1481.in June 1991.
 HV1481
 HV1481.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1481.GEOID18 height accuracy estimate available here.
 HV1481
 HV1481.Click photographs - Photos may exist for this station.
 HV1481
 HV1481.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1481
 HV1481.The dynamic height is computed by dividing the NAVD 88
 HV1481.geopotential number by the normal gravity value computed on the
 HV1481.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1481.degrees latitude (g = 980.6199 gals.).
 HV1481
 HV1481.The modeled gravity was interpolated from observed gravity values.
 HV1481
 HV1481. The following values were computed from the NAD 83(1993) position.
 HV1481
 HV1481;                    North         East     Units Scale Factor Converg.
 HV1481;SPC MD       -   138,135.801   405,643.777   MT  0.99995004   +0 02 27.0
 HV1481;SPC MD       -   453,200.54  1,330,849.63   sFT  0.99995004   +0 02 27.0
 HV1481;SPC VA N     - 2,139,285.699 3,635,734.366   MT  0.99996148   +0 58 36.4
 HV1481;SPC VA N     - 7,018,639.83 11,928,238.50   sFT  0.99996148   +0 58 36.4
 HV1481;UTM  18      - 4,308,687.316   332,234.906   MT  0.99994658   -1 12 56.3
 HV1481
 HV1481!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1481!SPC MD       -   1.00000321  x   0.99995004  =   0.99995325
 HV1481!SPC VA N     -   1.00000321  x   0.99996148  =   0.99996469
 HV1481!UTM  18      -   1.00000321  x   0.99994658  =   0.99994979
 HV1481
 HV1481:                Primary Azimuth Mark                     Grid Az
 HV1481:SPC MD       -  N E 146 C 1960                           215 31 46.4
 HV1481:SPC VA N     -  N E 146 C 1960                           214 35 37.0
 HV1481:UTM  18      -  N E 146 C 1960                           216 47 09.7
 HV1481
 HV1481_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3223408687(NAD 83)
 HV1481
 HV1481|---------------------------------------------------------------------|
 HV1481| PID    Reference Object                     Distance      Geod. Az  |
 HV1481|                                                           dddmmss.s |
 HV1481| HV7659 N E 147 A 1960                      232.999 METERS 13432     |
 HV1481| HV7656 N E 146 C 1960                      APPROX. 0.6 KM 2153413.4 |
 HV1481|---------------------------------------------------------------------|
 HV1481
 HV1481                          SUPERSEDED SURVEY CONTROL
 HV1481
 HV1481  NAD 83(1991)-  38 54 39.83864(N)    076 56 05.73948(W) AD(       ) 2
 HV1481  NAD 83(1986)-  38 54 39.83757(N)    076 56 05.75000(W) AD(       ) 2
 HV1481  NAD 27      -  38 54 39.43690(N)    076 56 06.84350(W) AD(       ) 2
 HV1481  NGVD 29              12.03   (m)           39.5    (f) LEVELING    3  
 HV1481  NGVD 29 (11/26/84)   12.025  (m)           39.45   (f) ADJUSTED    2 0
 HV1481
 HV1481.Superseded values are not recommended for survey control.
 HV1481
 HV1481.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1481.See file dsdata.pdf to determine how the superseded data were derived.
 HV1481
 HV1481_MARKER: DD = SURVEY DISK
 HV1481_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1481_STAMPING: USCGS NO NE 147
 HV1481_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1481+STABILITY: SURFACE MOTION
 HV1481
 HV1481  HISTORY     - Date     Condition        Report By
 HV1481  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1481  HISTORY     - 1960     GOOD             MADHOP
 HV1481  HISTORY     - 1971     GOOD             NGS
 HV1481
 HV1481                          STATION DESCRIPTION
 HV1481
 HV1481'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1481'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1481'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO. N.E. 147 SET
 HV1481'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1481'COVER WITH LID LABELED SURVEY.
 HV1481
 HV1481                          STATION RECOVERY (1960)
 HV1481
 HV1481'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1481'IN DC.
 HV1481'LOCATED AT THE INTERSECTION OF KENILWORTH AVE. N.E. AND QUARELS
 HV1481'ST. N.E. 8.04 FT NORTH OF CROSS CUT IN MANHOLE RIM, AND 14.64
 HV1481'FT NORTHWEST OF CROSS CUT IN MANHOLE RIM, AND 44.89 FT SOUTHWEST
 HV1481'OF CROSS CUT IN MANHOLE RIM.  A STANDARD BRASS DISC SET IN TOP
 HV1481'OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER
 HV1481'WITH LID LABELED SURVEY.
 HV1481
 HV1481                          STATION RECOVERY (1971)
 HV1481
 HV1481'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1481'THE STATION RECOVERED IN GOOD CONDITION.  THE MANHOLES STILL
 HV1481'REMAIN BUT THE CROSSES CHISELED IN THE RIMS HAVE WORN OFF.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1476 ***********************************************************************
 HV1476  DESIGNATION -  NE 148
 HV1476  PID         -  HV1476
 HV1476  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1476  COUNTRY     -  US
 HV1476  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1476
 HV1476                         *CURRENT SURVEY CONTROL
 HV1476  ______________________________________________________________________
 HV1476* NAD 83(1993) POSITION- 38 53 54.22337(N) 076 55 54.31152(W)   ADJUSTED
 HV1476* NAVD 88 ORTHO HEIGHT -    13.991 (meters)       45.90  (feet) ADJUSTED
 HV1476  ______________________________________________________________________
 HV1476  GEOID HEIGHT    -        -32.268 (meters)                     GEOID18
 HV1476  LAPLACE CORR    -         -4.40  (seconds)                    DEFLEC18
 HV1476  DYNAMIC HEIGHT  -         13.983 (meters)       45.88  (feet) COMP
 HV1476  MODELED GRAVITY -    980,088.4   (mgal)                       NAVD 88
 HV1476
 HV1476  HORZ ORDER      -  SECOND
 HV1476  VERT ORDER      -  SECOND    CLASS 0
 HV1476
 HV1476.The horizontal coordinates were established by classical geodetic methods
 HV1476.and adjusted by the National Geodetic Survey in November 1994.
 HV1476
 HV1476.The orthometric height was determined by differential leveling and
 HV1476.adjusted by the NATIONAL GEODETIC SURVEY
 HV1476.in June 1991.
 HV1476
 HV1476.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1476.GEOID18 height accuracy estimate available here.
 HV1476
 HV1476.Click photographs - Photos may exist for this station.
 HV1476
 HV1476.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1476
 HV1476.The dynamic height is computed by dividing the NAVD 88
 HV1476.geopotential number by the normal gravity value computed on the
 HV1476.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1476.degrees latitude (g = 980.6199 gals.).
 HV1476
 HV1476.The modeled gravity was interpolated from observed gravity values.
 HV1476
 HV1476. The following values were computed from the NAD 83(1993) position.
 HV1476
 HV1476;                    North         East     Units Scale Factor Converg.
 HV1476;SPC MD       -   136,729.389   405,920.124   MT  0.99994993   +0 02 34.2
 HV1476;SPC MD       -   448,586.34  1,331,756.27   sFT  0.99994993   +0 02 34.2
 HV1476;SPC VA N     - 2,137,883.973 3,636,033.653   MT  0.99996037   +0 58 43.6
 HV1476;SPC VA N     - 7,014,041.00 11,929,220.41   sFT  0.99996037   +0 58 43.6
 HV1476;UTM  18      - 4,307,275.189   332,480.350   MT  0.99994557   -1 12 47.9
 HV1476
 HV1476!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1476!SPC MD       -   1.00000287  x   0.99994993  =   0.99995280
 HV1476!SPC VA N     -   1.00000287  x   0.99996037  =   0.99996324
 HV1476!UTM  18      -   1.00000287  x   0.99994557  =   0.99994844
 HV1476
 HV1476:                Primary Azimuth Mark                     Grid Az
 HV1476:SPC MD       -  NE 148 AZ MK                             091 54 54.9
 HV1476:SPC VA N     -  NE 148 AZ MK                             090 58 45.5
 HV1476:UTM  18      -  NE 148 AZ MK                             093 10 17.0
 HV1476
 HV1476_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3248007275(NAD 83)
 HV1476
 HV1476|---------------------------------------------------------------------|
 HV1476| PID    Reference Object                     Distance      Geod. Az  |
 HV1476|                                                           dddmmss.s |
 HV1476| HV7661 N E 147 C 1960                      362.922 METERS 00140     |
 HV1476| CX3520 NE 148 AZ MK                                       0915729.1 |
 HV1476|---------------------------------------------------------------------|
 HV1476
 HV1476                          SUPERSEDED SURVEY CONTROL
 HV1476
 HV1476  NAD 83(1991)-  38 53 54.22207(N)    076 55 54.31258(W) AD(       ) 2
 HV1476  NAD 83(1986)-  38 53 54.22098(N)    076 55 54.32318(W) AD(       ) 2
 HV1476  NAD 27      -  38 53 53.81960(N)    076 55 55.41630(W) AD(       ) 2
 HV1476  NGVD 29              14.23   (m)           46.7    (f) LEVELING    3  
 HV1476  NGVD 29 (11/26/84)   14.229  (m)           46.68   (f) ADJUSTED    2 0
 HV1476
 HV1476.Superseded values are not recommended for survey control.
 HV1476
 HV1476.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1476.See file dsdata.pdf to determine how the superseded data were derived.
 HV1476
 HV1476_MARKER: DD = SURVEY DISK
 HV1476_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1476_STAMPING: USCGS NO NE 148
 HV1476_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1476+STABILITY: SURFACE MOTION
 HV1476
 HV1476  HISTORY     - Date     Condition        Report By
 HV1476  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1476  HISTORY     - 1960     GOOD             MADHOP
 HV1476  HISTORY     - 1971     GOOD             NGS
 HV1476
 HV1476                          STATION DESCRIPTION
 HV1476
 HV1476'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1476'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1476'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. NE 148 SET IN
 HV1476'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1476'COVER WITH LID LABELED SURVEY.
 HV1476'
 HV1476'AZIMUTH MARK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1476'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NE 148-AZ. SET
 HV1476'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1476'COVER WITH LID LABELED SURVEY
 HV1476'
 HV1476'NO GEOGRAPHIC POSITION.
 HV1476
 HV1476                          STATION RECOVERY (1960)
 HV1476
 HV1476'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1476'IN DC.
 HV1476'LOCATED AT INTERSECTION OF GRANT ST. NE., 49TH ST. NE, AND
 HV1476'DEANE AVE. ON WEST SIDE OF INTERSECTIONS.  32.56 FT NORTHWEST OF
 HV1476'CROSS CUT IN MANHOLE RIM IN ROADWAY OF 49TH ST., AND 20.70 FT
 HV1476'SOUTH OF CROSS CUT IN MANHOLE RIM ADJACENT TO 49TH ST. AND DEANE
 HV1476'AVE., AND 24.08 FT NORTHEAST OF CROSS CUT IN MANHOLE RIM IN
 HV1476'ROADWAY OF GRANT ST., N.E.  A STANDARD BRASS DISC SET IN TOP OF
 HV1476'12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER
 HV1476'WITH LID LABELED SURVEY.
 HV1476
 HV1476                          STATION RECOVERY (1971)
 HV1476
 HV1476'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1476'STATION WAS RECOVERED IN GOOD CONDITION.  THE LID TO MANHOLE
 HV1476'COVERING THE STATION IS MISSING.  ALL REFERENCE POINTS GIVEN
 HV1476'RECOVERED AS DESCRIBED.  ADDITIONAL MEASUREMENTS TO STATION
 HV1476'ARE.  10.5 FEET NORTHEAST OF LAMPOST, 6-INCHES WEST OF BACK OF
 HV1476'CURB.
 HV1476'
 HV1476'NE 148-AZ WAS RECOVERED AS DESCRIBED AND SHOWN ON SKETCH.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1822 ***********************************************************************
 HV1822  DESIGNATION -  NEW
 HV1822  PID         -  HV1822
 HV1822  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1822  COUNTRY     -  US
 HV1822  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1822
 HV1822                         *CURRENT SURVEY CONTROL
 HV1822  ______________________________________________________________________
 HV1822* NAD 83(1993) POSITION- 38 54 21.86490(N) 077 04 53.67897(W)   ADJUSTED
 HV1822* NAVD 88 ORTHO HEIGHT -    29.04  (+/-2cm)       95.3   (feet) VERTCON3
 HV1822  ______________________________________________________________________
 HV1822  GEOID HEIGHT    -        -31.995 (meters)                     GEOID18
 HV1822  LAPLACE CORR    -         -2.74  (seconds)                    DEFLEC18
 HV1822  HORZ ORDER      -  THIRD
 HV1822  VERT ORDER      -  ? (See Below)
 HV1822
 HV1822.The horizontal coordinates were established by classical geodetic methods
 HV1822.and adjusted by the National Geodetic Survey in November 1994.
 HV1822
 HV1822.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1822.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1822
 HV1822.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1822.GEOID18 height accuracy estimate available here.
 HV1822
 HV1822.The vertical order pertains to the NGVD 29 superseded value.
 HV1822
 HV1822.Click photographs - Photos may exist for this station.
 HV1822
 HV1822.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1822
 HV1822. The following values were computed from the NAD 83(1993) position.
 HV1822
 HV1822;                    North         East     Units Scale Factor Converg.
 HV1822;SPC MD       -   137,582.680   392,924.257   MT  0.99994999   -0 03 04.3
 HV1822;SPC MD       -   451,385.84  1,289,119.00   sFT  0.99994999   -0 03 04.3
 HV1822;SPC VA N     - 2,138,524.817 3,623,025.439   MT  0.99996104   +0 53 06.9
 HV1822;SPC VA N     - 7,016,143.50 11,886,542.63   sFT  0.99996104   +0 53 06.9
 HV1822;UTM  18      - 4,308,413.234   319,506.016   MT  1.00000117   -1 18 27.6
 HV1822
 HV1822!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1822!SPC MD       -   1.00000046  x   0.99994999  =   0.99995045
 HV1822!SPC VA N     -   1.00000046  x   0.99996104  =   0.99996150
 HV1822!UTM  18      -   1.00000046  x   1.00000117  =   1.00000163
 HV1822
 HV1822:                Primary Azimuth Mark                     Grid Az
 HV1822:SPC MD       -  ARLINGTON BREWERY CUPOLA                 135 06 27.5
 HV1822:SPC VA N     -  ARLINGTON BREWERY CUPOLA                 134 10 16.3
 HV1822:UTM  18      -  ARLINGTON BREWERY CUPOLA                 136 21 50.8
 HV1822
 HV1822_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1950608413(NAD 83)
 HV1822
 HV1822|---------------------------------------------------------------------|
 HV1822| PID    Reference Object                     Distance      Geod. Az  |
 HV1822|                                                           dddmmss.s |
 HV1822| DC6966 NEW WM 3                             17.500 METERS 12446     |
 HV1822| HV0043 ARLINGTON BREWERY CUPOLA            APPROX. 1.0 KM 1350323.2 |
 HV1822| HV3388 SIMPSON                             APPROX. 0.5 KM 1451307.4 |
 HV1822| DC6964 NEW WM 1                             17.140 METERS 21357     |
 HV1822| DC6965 NEW WM 2                             20.660 METERS 23329     |
 HV1822|---------------------------------------------------------------------|
 HV1822
 HV1822                          SUPERSEDED SURVEY CONTROL
 HV1822
 HV1822  NAD 83(1991)-  38 54 21.86367(N)    077 04 53.68056(W) AD(       ) 3
 HV1822  NAD 83(1986)-  38 54 21.86314(N)    077 04 53.68988(W) AD(       ) 3
 HV1822  NAD 27      -  38 54 21.45750(N)    077 04 54.76650(W) AD(       ) 3
 HV1822  NGVD 29              29.27   (m)           96.0    (f) LEVELING    3  
 HV1822  NGVD 29 (11/26/84)   29.268  (m)           96.02   (f) ADJUSTED       
 HV1822
 HV1822.Superseded values are not recommended for survey control.
 HV1822
 HV1822.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1822.See file dsdata.pdf to determine how the superseded data were derived.
 HV1822
 HV1822_MARKER: DD = SURVEY DISK
 HV1822_SETTING: 17 = SET INTO TOP OF METAL PIPE DRIVEN INTO GROUND
 HV1822_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1822
 HV1822  HISTORY     - Date     Condition        Report By
 HV1822  HISTORY     - 1925     MONUMENTED       USACE
 HV1822  HISTORY     - 1925     GOOD             CGS
 HV1822  HISTORY     - 1940     GOOD             CGS
 HV1822  HISTORY     - 1946     GOOD             CGS
 HV1822  HISTORY     - 1956     GOOD             CGS
 HV1822  HISTORY     - 1960     GOOD             MADHOP
 HV1822  HISTORY     - 1960     GOOD             CGS
 HV1822
 HV1822                          STATION DESCRIPTION
 HV1822
 HV1822'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1925 (GLB)
 HV1822'STATION IS SITUATED NEAR FOXHALL ROAD, WHERE 44TH STREET
 HV1822'INTERSECTS IT AND THE CAR LINE CROSSES IT, ON THE NW SIDE OF
 HV1822'FOXHALL ROAD NEAR THE RESIDENCE AT 1310 44TH STREET KNOWN AS
 HV1822'OAKCREST.  A U.S. ENGINEERS MARK IS SET IN A 12-INCH TILE,
 HV1822'PROJECTING 3 INCHES ABOVE THE SURFACE OF THE GROUND, WITH THE
 HV1822'BELL DOWN.
 HV1822'
 HV1822'STATION MARK IS A STANDARD DISK SET IN CONCRETE AT THE CENTER
 HV1822'OF THE TOP OF A TILE WHICH IS SURROUNDED BY A MASS OF CONCRETE.
 HV1822'
 HV1822'REFERENCE MARK NO.1 IS A STANDARD DISK WITH THE ARROW POINTING
 HV1822'TOWARD THE STATION, SET IN CONCRETE AT THE CORNER OF THE STEPS
 HV1822'LEADING TO THE HOUSE.
 HV1822'
 HV1822'WITNESS MARK NO.1 IS THE NE CORNER OF THE BRICK FOUNDATION OF
 HV1822'THE HOUSE.
 HV1822'
 HV1822'WITNESS MARK NO.2 IS THE NW CORNER OF THE BRICK FOUNDATION OF
 HV1822'THE HOUSE.
 HV1822'
 HV1822'WITNESS MARK NO.3 IS AN OAK TREE ABOUT 3 FEET IN DIAMETER.
 HV1822'
 HV1822'WASHINGTON MONUMENT SHOWS JUST OVER THE CENTER OF KEY BRIDGE.
 HV1822
 HV1822                          STATION RECOVERY (1925)
 HV1822
 HV1822'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1925
 HV1822'AT WASHINGTON.
 HV1822'AT WASHINGTON, NEAR THE INTERSECTION OF FOXHALL ROAD AND
 HV1822'FORTY-FOURTH STREET NORTHWEST, SOUTH OF THE CROSSING OF THE CABIN
 HV1822'JOHN STREETCAR LINE, AT THE RESIDENCE AT 1310 FORTY-FOURTH STREET
 HV1822'KNOWN IN 1944 AS OAKCREST, 50 FEET NORTH OF THE HOUSE, AND ABOUT
 HV1822'7 PACES NORTH OF A DRIVE LEADING TO THE REAR OF THE HOUSE.  A
 HV1822'CORPS OF ENGINEERS, U.S. ARMY, STANDARD DISK, SET IN THE TOP OF A
 HV1822'CONCRETE-FILLED 12-INCH TILE PIPE PROJECTING 3 INCHES ABOVE
 HV1822'GROUND.
 HV1822
 HV1822                          STATION RECOVERY (1940)
 HV1822
 HV1822'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV1822'STATION AND REFERENCE MARK FOUND IN GOOD CONDITION.  DISTANCES
 HV1822'TO REFERENCE MARK AND WITNESS MARKS CHECKED APPROXIMATELY BY
 HV1822'PACING.
 HV1822
 HV1822                          STATION RECOVERY (1946)
 HV1822
 HV1822'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV1822'STATION AND REFERENCE MARKS RECOVERED AS DESCRIBED AND FOUND TO
 HV1822'BE IN GOOD CONDITION.  DESCRIPTION IS ADEQUATE.
 HV1822
 HV1822                          STATION RECOVERY (1956)
 HV1822
 HV1822'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956 (MLC)
 HV1822'STATION AND REFERENCE MARK RECOVERED AND FOUND TO BE IN GOOD
 HV1822'CONDITION.  THE STATION MARK IS A U.S. ENGINEERS DISK, SET IN
 HV1822'CONCRETE AND NOT STAMPED.
 HV1822'
 HV1822'THE REFERENCE MARK IS A U.S.C. AND G.S. REFERENCE-MARK DISK,
 HV1822'AND NOT STAMPED.
 HV1822
 HV1822                          STATION RECOVERY (1960)
 HV1822
 HV1822'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1822'THE STATION MARK WAS RECOVERED IN GOOD CONDITION.  THE HOUSE
 HV1822'REFERRED TO IN THE ORIGINAL DESCRIPTION NO LONGER EXISTS.  REFERENCE
 HV1822'MARKS NOT SEARCHED FOR.
 HV1822
 HV1822                          STATION RECOVERY (1960)
 HV1822
 HV1822'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1822'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4297 ***********************************************************************
 HV4297  DESIGNATION -  NGS
 HV4297  PID         -  HV4297
 HV4297  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4297  COUNTRY     -  US
 HV4297  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4297
 HV4297                         *CURRENT SURVEY CONTROL
 HV4297  ______________________________________________________________________
 HV4297* NAD 83(1993) POSITION- 38 54 17.23591(N) 077 02 17.18865(W)   NO CHECK
 HV4297* NAVD 88 ORTHO HEIGHT -    18.    (meters)       59.    (feet) SCALED
 HV4297  ______________________________________________________________________
 HV4297  GEOID HEIGHT    -        -32.054 (meters)                     GEOID18
 HV4297  LAPLACE CORR    -         -2.18  (seconds)                    DEFLEC18
 HV4297  HORZ ORDER      -  THIRD
 HV4297
 HV4297.The horizontal coordinates were established by classical geodetic methods
 HV4297.and adjusted by the National Geodetic Survey in November 1994.
 HV4297
 HV4297.No horizontal observational check was made to the station.
 HV4297
 HV4297.The orthometric height was scaled from a topographic map.
 HV4297
 HV4297.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4297.GEOID18 height accuracy estimate available here.
 HV4297
 HV4297.Click photographs - Photos may exist for this station.
 HV4297
 HV4297.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4297
 HV4297. The following values were computed from the NAD 83(1993) position.
 HV4297
 HV4297;                    North         East     Units Scale Factor Converg.
 HV4297;SPC MD       -   137,437.470   396,694.590   MT  0.99994998   -0 01 26.1
 HV4297;SPC MD       -   450,909.43  1,301,488.83   sFT  0.99994998   -0 01 26.1
 HV4297;SPC VA N     - 2,138,441.242 3,626,797.684   MT  0.99996092   +0 54 44.6
 HV4297;SPC VA N     - 7,015,869.31 11,898,918.73   sFT  0.99996092   +0 54 44.6
 HV4297;UTM  18      - 4,308,185.377   323,272.421   MT  0.99998460   -1 16 49.2
 HV4297
 HV4297!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4297!SPC MD       -   1.00000224  x   0.99994998  =   0.99995222
 HV4297!SPC VA N     -   1.00000224  x   0.99996092  =   0.99996316
 HV4297!UTM  18      -   1.00000224  x   0.99998460  =   0.99998684
 HV4297
 HV4297:                Primary Azimuth Mark                     Grid Az
 HV4297:SPC MD       -  CAPITOL STATUE OF FREEDOM HEAD           123 25 58.8
 HV4297:SPC VA N     -  CAPITOL STATUE OF FREEDOM HEAD           122 29 48.1
 HV4297:UTM  18      -  CAPITOL STATUE OF FREEDOM HEAD           124 41 21.9
 HV4297
 HV4297_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2327208185(NAD 83)
 HV4297
 HV4297|---------------------------------------------------------------------|
 HV4297| PID    Reference Object                     Distance      Geod. Az  |
 HV4297|                                                           dddmmss.s |
 HV4297| HV4150 CAPITOL STATUE OF FREEDOM HEAD      APPROX. 3.0 KM 1232432.7 |
 HV4297| HV4264 OLD POST OFFICE FINIAL              APPROX. 1.5 KM 1413347.6 |
 HV4297| HV4631 ALEXANDRIA WASH MASON MEMORIAL      APPROX.11.1 KM 1923643.4 |
 HV4297|---------------------------------------------------------------------|
 HV4297
 HV4297                          SUPERSEDED SURVEY CONTROL
 HV4297
 HV4297  NAD 83(1991)-  38 54 17.23516(N)    077 02 17.19005(W) AD(       ) 3
 HV4297  NAD 83(1986)-  38 54 17.23457(N)    077 02 17.20055(W) AD(       ) 3
 HV4297  NAD 27      -  38 54 16.83700(N)    077 02 18.27800(W) AD(       ) 3
 HV4297
 HV4297.Superseded values are not recommended for survey control.
 HV4297
 HV4297.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4297.See file dsdata.pdf to determine how the superseded data were derived.
 HV4297
 HV4297_MARKER: DS = TRIANGULATION STATION DISK
 HV4297_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV4297_SP_SET: BUILDING LEDGE
 HV4297_STAMPING: NGS 1964
 HV4297_MARK LOGO: CGS
 HV4297_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV4297
 HV4297  HISTORY     - Date     Condition        Report By
 HV4297  HISTORY     - 1964     MONUMENTED       CGS
 HV4297
 HV4297                          STATION DESCRIPTION
 HV4297
 HV4297'DESCRIBED BY COAST AND GEODETIC SURVEY 1964
 HV4297'STATION IS LOCATED ON TOP OF THE NATIONAL GEOGRAPHIC BUILDING,
 HV4297'17TH AND M STREETS, WASHINGTON, D.C.
 HV4297'
 HV4297'STATION IS A STANDARD C AND GS DISK, CEMENTED IN DRILL HOLE,
 HV4297'STAMPED NGS 1964.  STATION IS ON THE EAST SIDE OF THE BUILDING ON
 HV4297'THE OUTER LEDGE AND IS SET BETWEEN THE 16TH AND 17TH SQUARE SHAPED
 HV4297'HOLES ON THE LEDGE.  IT IS 1.04 FEET FROM EDGE OF THE NORTH HOLE,
 HV4297'1.06 FEET FROM EDGE OF THE SOUTH HOLE AND 2.49 FEET FROM THE
 HV4297'MAIN BUILDING SIDING.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DO9452 ***********************************************************************
 DO9452  DESIGNATION -  NRL1
 DO9452  PID         -  DO9452
 DO9452  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DO9452  COUNTRY     -  US
 DO9452  USGS QUAD   -  ALEXANDRIA (2019)
 DO9452
 DO9452                         *CURRENT SURVEY CONTROL
 DO9452  ______________________________________________________________________
 DO9452* NAD 83(2011) POSITION- 38 49 18.63373(N) 077 01 17.76035(W)   ADJUSTED
 DO9452* NAD 83(2011) ELLIP HT-   -25.665 (meters)        (09/09/13)   ADJUSTED
 DO9452* NAD 83(2011) EPOCH   -  2010.00
 DO9452* NAVD 88 ORTHO HEIGHT -     6.6   (meters)       22.    (feet) GPS OBS
 DO9452  ______________________________________________________________________
 DO9452  NAVD 88 orthometric height was determined with geoid model    GEOID12A
 DO9452  GEOID HEIGHT    -        -32.227 (meters)                     GEOID12A
 DO9452  GEOID HEIGHT    -        -32.224 (meters)                     GEOID18
 DO9452  NAD 83(2011) X  -  1,117,467.909 (meters)                     COMP
 DO9452  NAD 83(2011) Y  - -4,848,624.055 (meters)                     COMP
 DO9452  NAD 83(2011) Z  -  3,976,911.280 (meters)                     COMP
 DO9452  LAPLACE CORR    -         -2.96  (seconds)                    DEFLEC18
 DO9452
 DO9452  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 DO9452  Standards:
 DO9452         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 DO9452            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 DO9452  -------------------------------------------------------------------
 DO9452  NETWORK    0.96   2.59           0.43   0.35   1.32      0.02081359
 DO9452  -------------------------------------------------------------------
 DO9452  Click here for local accuracies and other accuracy information.
 DO9452
 DO9452.The horizontal coordinates were established by GPS observations
 DO9452.and adjusted by the GEOMETRICS GPS INCORPORATED in September 2013.
 DO9452
 DO9452.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 DO9452.been affixed to the stable North American tectonic plate. See 
 DO9452.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 DO9452
 DO9452.The horizontal coordinates are valid at the epoch date displayed above
 DO9452.which is a decimal equivalence of Year/Month/Day.
 DO9452
 DO9452.The orthometric height was determined by GPS observations and a
 DO9452.high-resolution geoid model.
 DO9452
 DO9452.Significant digits in the geoid height do not necessarily reflect accuracy.
 DO9452.GEOID18 height accuracy estimate available here.
 DO9452
 DO9452.Click photographs - Photos may exist for this station.
 DO9452
 DO9452.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 DO9452
 DO9452.The Laplace correction was computed from DEFLEC18 derived deflections.
 DO9452
 DO9452.The ellipsoidal height was determined by GPS observations
 DO9452.and is referenced to NAD 83.
 DO9452
 DO9452. The following values were computed from the NAD 83(2011) position.
 DO9452
 DO9452;                    North         East     Units Scale Factor Converg.
 DO9452;UTM  18      - 4,298,947.997   324,500.083   MT  0.99997928   -1 16 03.6
 DO9452
 DO9452!             -  Elev Factor  x  Scale Factor =   Combined Factor
 DO9452!UTM  18      -   1.00000403  x   0.99997928  =   0.99998331
 DO9452
 DO9452_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2450098947(NAD 83)
 DO9452
 DO9452                          SUPERSEDED SURVEY CONTROL
 DO9452
 DO9452.No superseded survey control is available for this station.
 DO9452
 DO9452_MARKER: DD = SURVEY DISK
 DO9452_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DO9452_STAMPING: NRL1 2013
 DO9452_MARK LOGO: USN
 DO9452_PROJECTION: FLUSH
 DO9452_MAGNETIC: N = NO MAGNETIC MATERIAL
 DO9452_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DO9452+STABILITY: SURFACE MOTION
 DO9452_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 DO9452+SATELLITE: SATELLITE OBSERVATIONS - March 27, 2013
 DO9452
 DO9452  HISTORY     - Date     Condition        Report By
 DO9452  HISTORY     - 20130327 MONUMENTED       GEOMET
 DO9452
 DO9452                          STATION DESCRIPTION
 DO9452
 DO9452'DESCRIBED BY GEOMETRICS GPS INCORPORATED 2013 (DWB)
 DO9452'THE STATION IS LOCATED ABOUT 30.6 MI (49.2 KM) WEST OF ANNAPOLIS
 DO9452'MARYLAND, 15.4 MI (24.6 KM) EAST OF FAIRFAX, VIRGINIA.  11.3 MI (18.2
 DO9452'KM) SOUTHEAST OF MCLEAN, VIRGINIA.
 DO9452'
 DO9452'TO REACH FROM THE INTERSECTION OF INTERSTATE 95 AND INTERSTATE 295
 DO9452'NORTH, GO NORTH ON INTERSTATE 295 2.0 MI (3.2 KM) TO EXIT 1, NAVAL
 DO9452'RESEARCH LABORATORY, AND INTERSECTION WITH OVERLOOK AVENUE SOUTHWEST,
 DO9452'CONTINUE STRAIGHT THROUGH THE INTERSECTION 0.24 MI (0.4 KM) WEST TO A
 DO9452'SIDE-ROAD LEFT, TURN LEFT AND GO 0.03 MI (0.0 KM) TO AN INTERSECTION
 DO9452'WITH COOLEY ROAD, TURN LEFT AND GO 0.01 MI (0.0 KM) TO THE STATION ON
 DO9452'THE RIGHT AT THE SOUTHEASTERN CORNER OF THE INTERSECTION OF THE
 DO9452'RAILROAD TRACKS AND COOLEY ROAD.
 DO9452'
 DO9452'THE STATION IS A DISK STAMPED --NRL1-- SET IN A ROUND CONCRETE
 DO9452'MONUMENT 1.2 M (3.9 FT) DEEP AND 0.3 M (1.0 FT) IN DIAMETER.  THE MARK
 DO9452'IS SET FLUSH WITH THE GROUND.  THE MARK IS 25.0 FT (7.6 M) SOUTHEAST
 DO9452'OF AN ELECTRIC VAULT, 45.0 FT (13.7 M) SOUTHWEST OF THE CENTERLINE OF
 DO9452'THE INTERSECTION OF THE RAILROAD TRACKS AND COOLEY ROAD, 10.0 FT (3.0
 DO9452'M) SOUTHWEST OF A DRAIN INLET, 98.0 FT (29.9 M) NORTHEAST OF A
 DO9452'MANHOLE, 6.5 FT (2.0 M) SOUTHEAST OF THE CENTERLINE OF THE RAILROAD
 DO9452'TRACKS, 45.0 FT (13.7 M) SOUTHWEST OF THE CENTERLINE OF COOLEY ROAD.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1898 ***********************************************************************
 HV1898  DESIGNATION -  NW 10
 HV1898  PID         -  HV1898
 HV1898  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1898  COUNTRY     -  US
 HV1898  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1898
 HV1898                         *CURRENT SURVEY CONTROL
 HV1898  ______________________________________________________________________
 HV1898* NAD 83(1986) POSITION- 38 55 00.00   (N) 077 02 47.01   (W)   HD_HELD1
 HV1898* NAVD 88 ORTHO HEIGHT -    49.365 (meters)      161.96  (feet) ADJUSTED
 HV1898  ______________________________________________________________________
 HV1898  GEOID HEIGHT    -        -32.025 (meters)                     GEOID18
 HV1898  DYNAMIC HEIGHT  -         49.339 (meters)      161.87  (feet) COMP
 HV1898  MODELED GRAVITY -    980,094.1   (mgal)                       NAVD 88
 HV1898
 HV1898  VERT ORDER      -  SECOND    CLASS 0
 HV1898
 HV1898.The horizontal coordinates were determined by differentially corrected
 HV1898.hand held GPS observations or other comparable positioning techniques
 HV1898.and have an estimated accuracy of +/- 3 meters.
 HV1898
 HV1898.The orthometric height was determined by differential leveling and
 HV1898.adjusted by the NATIONAL GEODETIC SURVEY
 HV1898.in June 1991.
 HV1898
 HV1898.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1898.GEOID18 height accuracy estimate available here.
 HV1898
 HV1898.Click photographs - Photos may exist for this station.
 HV1898
 HV1898.The dynamic height is computed by dividing the NAVD 88
 HV1898.geopotential number by the normal gravity value computed on the
 HV1898.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1898.degrees latitude (g = 980.6199 gals.).
 HV1898
 HV1898.The modeled gravity was interpolated from observed gravity values.
 HV1898
 HV1898
 HV1898_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2258309519(NAD 83)
 HV1898
 HV1898                          SUPERSEDED SURVEY CONTROL
 HV1898
 HV1898  NGVD 29 (11/26/84)   49.592  (m)          162.70   (f) ADJUSTED    2 0
 HV1898
 HV1898.Superseded values are not recommended for survey control.
 HV1898
 HV1898.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1898.See file dsdata.pdf to determine how the superseded data were derived.
 HV1898
 HV1898_MARKER: DD = SURVEY DISK
 HV1898_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1898_SP_SET: STEP
 HV1898_STAMPING: NW 10
 HV1898_MARK LOGO: PBPP
 HV1898_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1898_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1898+SATELLITE: SATELLITE OBSERVATIONS - October 16, 2020
 HV1898
 HV1898  HISTORY     - Date     Condition        Report By
 HV1898  HISTORY     - UNK      MONUMENTED       PBPP
 HV1898  HISTORY     - 1926     GOOD             PBPP
 HV1898  HISTORY     - 1961     GOOD             CGS
 HV1898  HISTORY     - 20020813 GOOD             INDIV
 HV1898  HISTORY     - 20060308 GOOD             GEOCAC
 HV1898  HISTORY     - 20081204 GOOD             AMTHOM
 HV1898  HISTORY     - 20120315 GOOD             GEOCAC
 HV1898  HISTORY     - 20201016 GOOD             NGS
 HV1898
 HV1898                          STATION DESCRIPTION
 HV1898
 HV1898'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1898'AT WASHINGTON.
 HV1898'AT WASHINGTON, ON CONNECTICUT AVENUE, AT THE INTERSECTION OF
 HV1898'CALIFORNIA STREET NORTHWEST, AT THE MC CLELLAN STATUE, AT THE
 HV1898'SOUTHEAST CORNER OF THE BASE, IN THE TOP OF THE LOWEST STEP,
 HV1898'18 INCHES NORTH OF THE SOUTH EDGE OF THE STEP, AND 14 INCHES
 HV1898'WEST OF THE EAST EDGE.  A PUBLIC BUILDINGS AND PUBLIC PARKS
 HV1898'STANDARD DISK, STAMPED NW 10.
 HV1898
 HV1898                          STATION RECOVERY (1961)
 HV1898
 HV1898'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1961
 HV1898'RECOVERED IN GOOD CONDITION.
 HV1898
 HV1898                          STATION RECOVERY (2002)
 HV1898
 HV1898'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 HV1898'RECOVERED IN GOOD CONDITION.
 HV1898
 HV1898                          STATION RECOVERY (2006)
 HV1898
 HV1898'RECOVERY NOTE BY GEOCACHING 2006 (WD)
 HV1898'RECOVERED IN GOOD CONDITION.
 HV1898
 HV1898                          STATION RECOVERY (2008)
 HV1898
 HV1898'RECOVERY NOTE BY A MORTON THOMAS AND ASSOCIATES 2008 (JAN)
 HV1898'RECOVERED IN GOOD CONDITION.
 HV1898
 HV1898                          STATION RECOVERY (2012)
 HV1898
 HV1898'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV1898'RECOVERED IN GOOD CONDITION.
 HV1898
 HV1898                          STATION RECOVERY (2020)
 HV1898
 HV1898'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JKH)
 HV1898'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2133 ***********************************************************************
 HV2133  DESIGNATION -  NW 101
 HV2133  PID         -  HV2133
 HV2133  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2133  COUNTRY     -  US
 HV2133  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2133
 HV2133                         *CURRENT SURVEY CONTROL
 HV2133  ______________________________________________________________________
 HV2133* NAD 83(1993) POSITION- 38 58 47.04419(N) 077 03 07.49612(W)   ADJUSTED
 HV2133* NAVD 88 ORTHO HEIGHT -    84.077 (meters)      275.84  (feet) ADJUSTED
 HV2133  ______________________________________________________________________
 HV2133  GEOID HEIGHT    -        -31.948 (meters)                     GEOID18
 HV2133  LAPLACE CORR    -         -2.74  (seconds)                    DEFLEC18
 HV2133  DYNAMIC HEIGHT  -         84.032 (meters)      275.70  (feet) COMP
 HV2133  MODELED GRAVITY -    980,086.1   (mgal)                       NAVD 88
 HV2133
 HV2133  HORZ ORDER      -  SECOND
 HV2133  VERT ORDER      -  SECOND    CLASS 0
 HV2133
 HV2133.The horizontal coordinates were established by classical geodetic methods
 HV2133.and adjusted by the National Geodetic Survey in November 1994.
 HV2133
 HV2133.The orthometric height was determined by differential leveling and
 HV2133.adjusted by the NATIONAL GEODETIC SURVEY
 HV2133.in June 1991.
 HV2133
 HV2133.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2133.GEOID18 height accuracy estimate available here.
 HV2133
 HV2133.Click photographs - Photos may exist for this station.
 HV2133
 HV2133.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2133
 HV2133.The dynamic height is computed by dividing the NAVD 88
 HV2133.geopotential number by the normal gravity value computed on the
 HV2133.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2133.degrees latitude (g = 980.6199 gals.).
 HV2133
 HV2133.The modeled gravity was interpolated from observed gravity values.
 HV2133
 HV2133. The following values were computed from the NAD 83(1993) position.
 HV2133
 HV2133;                    North         East     Units Scale Factor Converg.
 HV2133;SPC MD       -   145,757.823   395,487.234   MT  0.99995149   -0 01 57.7
 HV2133;SPC MD       -   478,207.12  1,297,527.70   sFT  0.99995149   -0 01 57.7
 HV2133;SPC VA N     - 2,146,740.870 3,625,454.503   MT  0.99996833   +0 54 13.2
 HV2133;SPC VA N     - 7,043,099.00 11,894,511.98   sFT  0.99996833   +0 54 13.2
 HV2133;UTM  18      - 4,316,530.524   322,247.907   MT  0.99998907   -1 17 28.3
 HV2133
 HV2133!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2133!SPC MD       -   0.99999182  x   0.99995149  =   0.99994331
 HV2133!SPC VA N     -   0.99999182  x   0.99996833  =   0.99996015
 HV2133!UTM  18      -   0.99999182  x   0.99998907  =   0.99998089
 HV2133
 HV2133:                Primary Azimuth Mark                     Grid Az
 HV2133:SPC MD       -  NW 101 AZ MK                             186 55 42.3
 HV2133:SPC VA N     -  NW 101 AZ MK                             185 59 31.4
 HV2133:UTM  18      -  NW 101 AZ MK                             188 11 12.9
 HV2133
 HV2133_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2224716530(NAD 83)
 HV2133
 HV2133|---------------------------------------------------------------------|
 HV2133| PID    Reference Object                     Distance      Geod. Az  |
 HV2133|                                                           dddmmss.s |
 HV2133| DC6932 NW 101 AZ MK                                       1865344.6 |
 HV2133| HV4280 N W 101 A 1960                      366.215 METERS 18804     |
 HV2133| HV4352 N W 101 D 1960                      153.270 METERS 27551     |
 HV2133|---------------------------------------------------------------------|
 HV2133
 HV2133                          SUPERSEDED SURVEY CONTROL
 HV2133
 HV2133  NAD 83(1991)-  38 58 47.04348(N)    077 03 07.49705(W) AD(       ) 2
 HV2133  NAD 83(1986)-  38 58 47.04316(N)    077 03 07.50700(W) AD(       ) 2
 HV2133  NAD 27      -  38 58 46.64800(N)    077 03 08.58400(W) AD(       ) 2
 HV2133  NGVD 29              84.31   (m)          276.6    (f) LEVELING    3  
 HV2133  NGVD 29 (11/26/84)   84.308  (m)          276.60   (f) ADJUSTED    2 0
 HV2133
 HV2133.Superseded values are not recommended for survey control.
 HV2133
 HV2133.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2133.See file dsdata.pdf to determine how the superseded data were derived.
 HV2133
 HV2133_MARKER: DD = SURVEY DISK
 HV2133_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2133_SP_SET: MONUMENT
 HV2133_STAMPING: USCGS NO NW 101
 HV2133_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2133
 HV2133  HISTORY     - Date     Condition        Report By
 HV2133  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2133  HISTORY     - 1960     GOOD             MADHOP
 HV2133  HISTORY     - 1971     GOOD             NGS
 HV2133
 HV2133                          STATION DESCRIPTION
 HV2133
 HV2133'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2133'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2133'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO. NW 101 SET IN
 HV2133'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2133'COVER WITH LID LABELED SURVEY.
 HV2133'
 HV2133'DESCRIPTION FOR BM RC 24 (NPS) SEE NW 101-A SKETCH.
 HV2133
 HV2133                          STATION RECOVERY (1960)
 HV2133
 HV2133'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2133'IN WASHINGTON DC.
 HV2133'LOCATED AT THE INTERSECTION OF OREGON AVE. N.W. AND CHESTNUT ST.
 HV2133'69.51 FT NORTHEAST OF A NAIL IN A CONCRETE FOOTING OF THE ROCK
 HV2133'CREEK PARK SIGN IN THE SOUTHEAST CORNER OF INTERSECTION, AND
 HV2133'20.98 FT SOUTHWEST OF A NAIL AND WASHER IN A 14 IN POPLAR ON
 HV2133'THE NORTHEAST CORNER OF THE INTERSECTION, 63.76 FT SOUTHEAST OF
 HV2133'THE CENTER TOP NUT OF A FIRE HYDRANT IN NORTH WEST CORNER OF THE
 HV2133'INTERSECTION.  A STANDARD BRASS DISC SET IN TOP OF 12 IN CONCRETE
 HV2133'MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID LABELED
 HV2133'SURVEY.
 HV2133
 HV2133                          STATION RECOVERY (1971)
 HV2133
 HV2133'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2133'THE STATION WAS RECOVERED AS DESCRIBED IN GOOD CONDITION.  ALL
 HV2133'REFERENCE POINTS REMAIN IN GOOD CONDITION WITH THE EXCEPTION, THE
 HV2133'NAIL AND WASHER IN 14-INCH POPLAR TREE IS GONE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2131 ***********************************************************************
 HV2131  DESIGNATION -  NW 101 C MADHOP
 HV2131  PID         -  HV2131
 HV2131  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2131  COUNTRY     -  US
 HV2131  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2131
 HV2131                         *CURRENT SURVEY CONTROL
 HV2131  ______________________________________________________________________
 HV2131* NAD 83(1986) POSITION- 38 58 15.     (N) 077 03 13.     (W)   SCALED
 HV2131* NAVD 88 ORTHO HEIGHT -    69.394 (meters)      227.67  (feet) ADJUSTED
 HV2131  ______________________________________________________________________
 HV2131  GEOID HEIGHT    -        -31.952 (meters)                     GEOID18
 HV2131  DYNAMIC HEIGHT  -         69.356 (meters)      227.55  (feet) COMP
 HV2131  MODELED GRAVITY -    980,086.1   (mgal)                       NAVD 88
 HV2131
 HV2131  VERT ORDER      -  SECOND    CLASS 0
 HV2131
 HV2131.The horizontal coordinates were scaled from a map and have
 HV2131.an estimated accuracy of +/- 6 seconds.
 HV2131
 HV2131.The orthometric height was determined by differential leveling and
 HV2131.adjusted by the NATIONAL GEODETIC SURVEY
 HV2131.in June 1991.
 HV2131
 HV2131.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2131.GEOID18 height accuracy estimate available here.
 HV2131
 HV2131.Click photographs - Photos may exist for this station.
 HV2131
 HV2131.The dynamic height is computed by dividing the NAVD 88
 HV2131.geopotential number by the normal gravity value computed on the
 HV2131.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2131.degrees latitude (g = 980.6199 gals.).
 HV2131
 HV2131.The modeled gravity was interpolated from observed gravity values.
 HV2131
 HV2131
 HV2131_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ220155(NAD 83)
 HV2131
 HV2131                          SUPERSEDED SURVEY CONTROL
 HV2131
 HV2131  NGVD 29 (11/26/84)   69.623  (m)          228.42   (f) ADJUSTED    2 0
 HV2131
 HV2131.Superseded values are not recommended for survey control.
 HV2131
 HV2131.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2131.See file dsdata.pdf to determine how the superseded data were derived.
 HV2131
 HV2131_MARKER: Z = SEE DESCRIPTION
 HV2131_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2131_SP_SET: STREET
 HV2131_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2131
 HV2131  HISTORY     - Date     Condition        Report By
 HV2131  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2131  HISTORY     - 1960     GOOD             MADHOP
 HV2131
 HV2131                          STATION DESCRIPTION
 HV2131
 HV2131'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2131'IN WASHINGTON DC.
 HV2131'IN THE INTERSECTION OF NEBRASKA AVE. AND OREGON AVE. N.W. 44.73
 HV2131'FT NORTHWEST OF A NAIL AND WASHER IN A 15 IN PIN OAK ON THE EAST
 HV2131'SIDE OF OREGON AVE., AND 57.74 FT SOUTHEAST OF A NAIL IN THE
 HV2131'SOUTHEAST CORNER OF A CATCH BASIN LOCATED ON NORTH SIDE OF
 HV2131'NEBRASKA AVE., AND 37.79 FT EAST OF A NAIL AND WASHER IN A STREET
 HV2131'LIGHT POLE LOCATED ON THE NORTH SIDE OF THE ISLAND BETWEEN OREGON
 HV2131'AVE. AND NEBRASKA AVE.  A PIPE AND SCREW 1 IN BELOW MACADAM.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2130 ***********************************************************************
 HV2130  DESIGNATION -  NW 102 DCDHT
 HV2130  PID         -  HV2130
 HV2130  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2130  COUNTRY     -  US
 HV2130  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2130
 HV2130                         *CURRENT SURVEY CONTROL
 HV2130  ______________________________________________________________________
 HV2130* NAD 83(1993) POSITION- 38 58 03.55969(N) 077 03 36.10950(W)   ADJUSTED
 HV2130* NAVD 88 ORTHO HEIGHT -    99.702 (meters)      327.11  (feet) ADJUSTED
 HV2130  ______________________________________________________________________
 HV2130  GEOID HEIGHT    -        -31.945 (meters)                     GEOID18
 HV2130  LAPLACE CORR    -         -2.95  (seconds)                    DEFLEC18
 HV2130  DYNAMIC HEIGHT  -         99.648 (meters)      326.93  (feet) COMP
 HV2130  MODELED GRAVITY -    980,085.3   (mgal)                       NAVD 88
 HV2130
 HV2130  HORZ ORDER      -  SECOND
 HV2130  VERT ORDER      -  SECOND    CLASS 0
 HV2130
 HV2130.The horizontal coordinates were established by classical geodetic methods
 HV2130.and adjusted by the National Geodetic Survey in November 1994.
 HV2130
 HV2130.The orthometric height was determined by differential leveling and
 HV2130.adjusted by the NATIONAL GEODETIC SURVEY
 HV2130.in June 1991.
 HV2130
 HV2130.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2130.GEOID18 height accuracy estimate available here.
 HV2130
 HV2130.Click photographs - Photos may exist for this station.
 HV2130
 HV2130.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2130
 HV2130.The dynamic height is computed by dividing the NAVD 88
 HV2130.geopotential number by the normal gravity value computed on the
 HV2130.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2130.degrees latitude (g = 980.6199 gals.).
 HV2130
 HV2130.The modeled gravity was interpolated from observed gravity values.
 HV2130
 HV2130. The following values were computed from the NAD 83(1993) position.
 HV2130
 HV2130;                    North         East     Units Scale Factor Converg.
 HV2130;SPC MD       -   144,417.359   394,797.669   MT  0.99995113   -0 02 15.6
 HV2130;SPC MD       -   473,809.29  1,295,265.35   sFT  0.99995113   -0 02 15.6
 HV2130;SPC VA N     - 2,145,389.293 3,624,786.925   MT  0.99996702   +0 53 55.4
 HV2130;SPC VA N     - 7,038,664.71 11,892,321.77   sFT  0.99996702   +0 53 55.4
 HV2130;UTM  18      - 4,315,205.474   321,529.043   MT  0.99999222   -1 17 45.1
 HV2130
 HV2130!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2130!SPC MD       -   0.99998937  x   0.99995113  =   0.99994050
 HV2130!SPC VA N     -   0.99998937  x   0.99996702  =   0.99995639
 HV2130!UTM  18      -   0.99998937  x   0.99999222  =   0.99998159
 HV2130
 HV2130:                Primary Azimuth Mark                     Grid Az
 HV2130:SPC MD       -  WASHINGTON TV STA WTOP TOWER             220 35 28.5
 HV2130:SPC VA N     -  WASHINGTON TV STA WTOP TOWER             219 39 17.5
 HV2130:UTM  18      -  WASHINGTON TV STA WTOP TOWER             221 50 58.0
 HV2130
 HV2130_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2152915205(NAD 83)
 HV2130
 HV2130|---------------------------------------------------------------------|
 HV2130| PID    Reference Object                     Distance      Geod. Az  |
 HV2130|                                                           dddmmss.s |
 HV2130| HV4186 WASHINGTON TV STA WTOP TOWER        APPROX. 2.6 KM 2203312.9 |
 HV2130| HV4278 N W 102 A 1960                      217.777 METERS 22259     |
 HV2130|---------------------------------------------------------------------|
 HV2130
 HV2130                          SUPERSEDED SURVEY CONTROL
 HV2130
 HV2130  NAD 83(1991)-  38 58 03.55894(N)    077 03 36.11050(W) AD(       ) 2
 HV2130  NAD 83(1986)-  38 58 03.55860(N)    077 03 36.12050(W) AD(       ) 2
 HV2130  NAD 27      -  38 58 03.16140(N)    077 03 37.19560(W) AD(       ) 2
 HV2130  NGVD 29              99.93   (m)          327.9    (f) LEVELING    3  
 HV2130  NGVD 29 (11/26/84)   99.931  (m)          327.86   (f) ADJUSTED    2 0
 HV2130
 HV2130.Superseded values are not recommended for survey control.
 HV2130
 HV2130.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2130.See file dsdata.pdf to determine how the superseded data were derived.
 HV2130
 HV2130_MARKER: DD = SURVEY DISK
 HV2130_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2130_SP_SET: CONCRETE MONUMENT
 HV2130_STAMPING: USCGS NO NW 102
 HV2130_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2130_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV2130+SATELLITE: SATELLITE OBSERVATIONS - October 17, 2014
 HV2130
 HV2130  HISTORY     - Date     Condition        Report By
 HV2130  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2130  HISTORY     - 1960     GOOD             MADHOP
 HV2130  HISTORY     - 1971     GOOD             NGS
 HV2130  HISTORY     - 20101030 GOOD             GEOCAC
 HV2130  HISTORY     - 20141017 GOOD             INDIV
 HV2130
 HV2130                          STATION DESCRIPTION
 HV2130
 HV2130'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2130'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2130'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO. NW 102 SET IN
 HV2130'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2130'COVER WITH LID LABELED SURVEY.
 HV2130
 HV2130                          STATION RECOVERY (1960)
 HV2130
 HV2130'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2130'IN WASHINGTON DC.
 HV2130'LOCATED ON NEBRASKA AVE. N.W. IN FRONT OF SATTERLEE HALL 41.22
 HV2130'FT SOUTH WEST OF SOUTH EAST CORNER OF BRICK WALL ON WEST SIDE
 HV2130'OF STEPS IN FRONT OF BUILDING, AND 42.82 FT SOUTH EAST OF SOUTH
 HV2130'WEST CORNER OF SATTERLEE HALL, AND 22.00 FT NORTH WEST OF NAIL
 HV2130'AND WASHER IN POWER POLE EP 121700 IN FRONT OF SATTERLEE HALL.  A
 HV2130'CONCRETE MONUMENT.
 HV2130
 HV2130                          STATION RECOVERY (1971)
 HV2130
 HV2130'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2130'STATION RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE LID TO THE
 HV2130'MANHOLE COVER IS ABOUT 1-INCH BELOW THE SURFACE OF THE GROUND.  POLE
 HV2130'EP NO. 121700 HAS BEEN REPLACED WITH A NEW POLE.  HOWEVER, THE
 HV2130'DISTANCE OF 22.0 FEET CHECKS TO THE CLOSE SIDE OF THE POLE.  THE
 HV2130'OTHER REFERENCE POINTS CHECK AND AN ADDITIONAL MEASUREMENT OF
 HV2130'32.6 FEET WAS MADE FROM THE STATION TO THE WEST EDGE OF THE
 HV2130'SIDEWALK FROM STREET TO BUILDING.
 HV2130
 HV2130                          STATION RECOVERY (2010)
 HV2130
 HV2130'RECOVERY NOTE BY GEOCACHING 2010 (RLM)
 HV2130'RECOVERED IN GOOD CONDITION.
 HV2130
 HV2130                          STATION RECOVERY (2014)
 HV2130
 HV2130'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2014 (WRA)
 HV2130'RECOVERED AS DESCRIBED, USED FOR STATIC GPS
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2147 ***********************************************************************
 HV2147  DESIGNATION -  NW 103
 HV2147  PID         -  HV2147
 HV2147  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2147  COUNTRY     -  US
 HV2147  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2147
 HV2147                         *CURRENT SURVEY CONTROL
 HV2147  ______________________________________________________________________
 HV2147* NAD 83(1993) POSITION- 38 57 39.83427(N) 077 04 23.38229(W)   ADJUSTED
 HV2147* NAVD 88 ORTHO HEIGHT -    90.989 (meters)      298.52  (feet) ADJUSTED
 HV2147  ______________________________________________________________________
 HV2147  GEOID HEIGHT    -        -31.932 (meters)                     GEOID18
 HV2147  LAPLACE CORR    -         -2.82  (seconds)                    DEFLEC18
 HV2147  DYNAMIC HEIGHT  -         90.940 (meters)      298.36  (feet) COMP
 HV2147  MODELED GRAVITY -    980,083.9   (mgal)                       NAVD 88
 HV2147
 HV2147  HORZ ORDER      -  SECOND
 HV2147  VERT ORDER      -  SECOND    CLASS 0
 HV2147
 HV2147.The horizontal coordinates were established by classical geodetic methods
 HV2147.and adjusted by the National Geodetic Survey in November 1994.
 HV2147
 HV2147.The orthometric height was determined by differential leveling and
 HV2147.adjusted by the NATIONAL GEODETIC SURVEY
 HV2147.in June 1991.
 HV2147
 HV2147.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2147.GEOID18 height accuracy estimate available here.
 HV2147
 HV2147.Click photographs - Photos may exist for this station.
 HV2147
 HV2147.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2147
 HV2147.The dynamic height is computed by dividing the NAVD 88
 HV2147.geopotential number by the normal gravity value computed on the
 HV2147.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2147.degrees latitude (g = 980.6199 gals.).
 HV2147
 HV2147.The modeled gravity was interpolated from observed gravity values.
 HV2147
 HV2147. The following values were computed from the NAD 83(1993) position.
 HV2147
 HV2147;                    North         East     Units Scale Factor Converg.
 HV2147;SPC MD       -   143,686.593   393,659.101   MT  0.99995095   -0 02 45.3
 HV2147;SPC MD       -   471,411.76  1,291,529.90   sFT  0.99995095   -0 02 45.3
 HV2147;SPC VA N     - 2,144,640.006 3,623,660.435   MT  0.99996632   +0 53 25.9
 HV2147;SPC VA N     - 7,036,206.42 11,888,625.94   sFT  0.99996632   +0 53 25.9
 HV2147;UTM  18      - 4,314,499.853   320,374.654   MT  0.99999731   -1 18 14.2
 HV2147
 HV2147!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2147!SPC MD       -   0.99999073  x   0.99995095  =   0.99994168
 HV2147!SPC VA N     -   0.99999073  x   0.99996632  =   0.99995705
 HV2147!UTM  18      -   0.99999073  x   0.99999731  =   0.99998804
 HV2147
 HV2147:                Primary Azimuth Mark                     Grid Az
 HV2147:SPC MD       -  N W 103 A 1960                           269 11 55.9
 HV2147:SPC VA N     -  N W 103 A 1960                           268 15 44.7
 HV2147:UTM  18      -  N W 103 A 1960                           270 27 24.8
 HV2147
 HV2147_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2037414499(NAD 83)
 HV2147
 HV2147|---------------------------------------------------------------------|
 HV2147| PID    Reference Object                     Distance      Geod. Az  |
 HV2147|                                                           dddmmss.s |
 HV2147| HV4094 N W 102 E 1960                      216.991 METERS 15619     |
 HV2147| HV4169 N W 103 A 1960                      APPROX. 0.7 KM 2690910.6 |
 HV2147| DC6933 NW 103 AZ MK                                       3344947.8 |
 HV2147|---------------------------------------------------------------------|
 HV2147
 HV2147                          SUPERSEDED SURVEY CONTROL
 HV2147
 HV2147  NAD 83(1991)-  38 57 39.83347(N)    077 04 23.38331(W) AD(       ) 2
 HV2147  NAD 83(1986)-  38 57 39.83316(N)    077 04 23.39335(W) AD(       ) 2
 HV2147  NAD 27      -  38 57 39.43520(N)    077 04 24.46650(W) AD(       ) 2
 HV2147  NGVD 29              91.22   (m)          299.3    (f) LEVELING    3  
 HV2147  NGVD 29 (11/26/84)   91.215  (m)          299.26   (f) ADJUSTED    2 0
 HV2147
 HV2147.Superseded values are not recommended for survey control.
 HV2147
 HV2147.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2147.See file dsdata.pdf to determine how the superseded data were derived.
 HV2147
 HV2147_MARKER: DD = SURVEY DISK
 HV2147_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV2147_STAMPING: USCGS NW 103
 HV2147_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV2147+STABILITY: SURFACE MOTION
 HV2147
 HV2147  HISTORY     - Date     Condition        Report By
 HV2147  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2147  HISTORY     - 1960     GOOD             MADHOP
 HV2147  HISTORY     - 1971     GOOD             NGS
 HV2147
 HV2147                          STATION DESCRIPTION
 HV2147
 HV2147'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2147'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2147'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO. NW 103 SET IN
 HV2147'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2147'COVER WITH LID LABELED SURVEY.
 HV2147'
 HV2147'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2147'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NW 103-AZ. SET
 HV2147'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2147'COVER WITH LID LABELED SURVEY.
 HV2147'
 HV2147'NO GEOGRAPHIC POSITION
 HV2147
 HV2147                          STATION RECOVERY (1960)
 HV2147
 HV2147'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2147'IN WASHINGTON DC.
 HV2147'LOCATED AT THE INTERSECTION OF CONNECTICUT AVE. N.W. AND MILITARY
 HV2147'RD. N.W. IN THE NORTHEAST CORNER OF THE INTERSECTION.  35.22 FT
 HV2147'SOUTHEAST OF A NAIL AND WASHER IN A 36 IN OAK TREE, AND 9.55 FT
 HV2147'WEST OF A NAIL AND WASHER IN A 36 IN BLACK OAK, AND 1.81 FT NORTH
 HV2147'OF THE CURB FACE.  A STANDARD BRASS DISC SET IN TOP OF 12 IN
 HV2147'CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID
 HV2147'LABELED SURVEY.
 HV2147
 HV2147                          STATION RECOVERY (1971)
 HV2147
 HV2147'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2147'THE STATION WAS RECOVERED AND IS 4-INCHES UNDER SURFACE OF
 HV2147'GROUND.  ALL REFERENCE POINTS ARE GONE EXCEPT THE MEASUREMENT TO
 HV2147'FACE OF CURB.  FOLLOWING ARE SOME ADDITIONAL MEASUREMENTS FOR
 HV2147'RECOVERY.  12-INCHES E OF E EDGE OF SIDEWALK, 2.9 FEET WEST OF A
 HV2147'METAL POLE SUPPORTING A TRAFFIC LIGHT, AND 4.0 FEET SOUTH OF
 HV2147'SOUTH EDGE OF SIDEWALK FROM THE EAST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2153 ***********************************************************************
 HV2153  DESIGNATION -  NW 104
 HV2153  PID         -  HV2153
 HV2153  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2153  COUNTRY     -  US
 HV2153  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2153
 HV2153                         *CURRENT SURVEY CONTROL
 HV2153  ______________________________________________________________________
 HV2153* NAD 83(1993) POSITION- 38 57 40.16549(N) 077 05 05.82593(W)   ADJUSTED
 HV2153* NAVD 88 ORTHO HEIGHT -    96.281 (meters)      315.88  (feet) ADJUSTED
 HV2153  ______________________________________________________________________
 HV2153  GEOID HEIGHT    -        -31.915 (meters)                     GEOID18
 HV2153  LAPLACE CORR    -         -2.47  (seconds)                    DEFLEC18
 HV2153  DYNAMIC HEIGHT  -         96.229 (meters)      315.71  (feet) COMP
 HV2153  MODELED GRAVITY -    980,084.2   (mgal)                       NAVD 88
 HV2153
 HV2153  HORZ ORDER      -  SECOND
 HV2153  VERT ORDER      -  FIRST     CLASS II
 HV2153
 HV2153.The horizontal coordinates were established by classical geodetic methods
 HV2153.and adjusted by the National Geodetic Survey in November 1994.
 HV2153
 HV2153.The orthometric height was determined by differential leveling and
 HV2153.adjusted by the NATIONAL GEODETIC SURVEY
 HV2153.in June 1991.
 HV2153
 HV2153.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2153.GEOID18 height accuracy estimate available here.
 HV2153
 HV2153.Click photographs - Photos may exist for this station.
 HV2153
 HV2153.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2153
 HV2153.The dynamic height is computed by dividing the NAVD 88
 HV2153.geopotential number by the normal gravity value computed on the
 HV2153.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2153.degrees latitude (g = 980.6199 gals.).
 HV2153
 HV2153.The modeled gravity was interpolated from observed gravity values.
 HV2153
 HV2153. The following values were computed from the NAD 83(1993) position.
 HV2153
 HV2153;                    North         East     Units Scale Factor Converg.
 HV2153;SPC MD       -   143,697.692   392,637.285   MT  0.99995095   -0 03 11.9
 HV2153;SPC MD       -   471,448.18  1,288,177.49   sFT  0.99995095   -0 03 11.9
 HV2153;SPC VA N     - 2,144,634.403 3,622,638.558   MT  0.99996633   +0 52 59.4
 HV2153;SPC VA N     - 7,036,188.04 11,885,273.34   sFT  0.99996633   +0 52 59.4
 HV2153;UTM  18      - 4,314,533.384   319,353.278   MT  1.00000185   -1 18 40.9
 HV2153
 HV2153!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2153!SPC MD       -   0.99998990  x   0.99995095  =   0.99994085
 HV2153!SPC VA N     -   0.99998990  x   0.99996633  =   0.99995623
 HV2153!UTM  18      -   0.99998990  x   1.00000185  =   0.99999175
 HV2153
 HV2153:                Primary Azimuth Mark                     Grid Az
 HV2153:SPC MD       -  N W 104 A 1960                           228 26 26.2
 HV2153:SPC VA N     -  N W 104 A 1960                           227 30 14.9
 HV2153:UTM  18      -  N W 104 A 1960                           229 41 55.2
 HV2153
 HV2153_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1935314533(NAD 83)
 HV2153
 HV2153|---------------------------------------------------------------------|
 HV2153| PID    Reference Object                     Distance      Geod. Az  |
 HV2153|                                                           dddmmss.s |
 HV2153| HV4169 N W 103 A 1960                      305.746 METERS 09354     |
 HV2153| HV3972 N W 104 A 1960                      416.511 METERS 2282314.3 |
 HV2153| DC6934 NW 104 AZ MK                                       2293135.0 |
 HV2153|---------------------------------------------------------------------|
 HV2153
 HV2153                          SUPERSEDED SURVEY CONTROL
 HV2153
 HV2153  NAD 83(1991)-  38 57 40.16473(N)    077 05 05.82691(W) AD(       ) 2
 HV2153  NAD 83(1986)-  38 57 40.16445(N)    077 05 05.83686(W) AD(       ) 2
 HV2153  NAD 27      -  38 57 39.76700(N)    077 05 06.90910(W) AD(       ) 2
 HV2153  NGVD 29              96.51   (m)          316.6    (f) LEVELING    3  
 HV2153  NGVD 29 (11/26/84)   96.505  (m)          316.62   (f) ADJUSTED    1 2
 HV2153
 HV2153.Superseded values are not recommended for survey control.
 HV2153
 HV2153.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2153.See file dsdata.pdf to determine how the superseded data were derived.
 HV2153
 HV2153_MARKER: DD = SURVEY DISK
 HV2153_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2153_SP_SET: MONUMENT
 HV2153_STAMPING: USCGS NO NW 104
 HV2153_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2153
 HV2153  HISTORY     - Date     Condition        Report By
 HV2153  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2153  HISTORY     - 1960     GOOD             MADHOP
 HV2153  HISTORY     - 1971     GOOD             NGS
 HV2153  HISTORY     - 1979     GOOD             NGS
 HV2153
 HV2153                          STATION DESCRIPTION
 HV2153
 HV2153'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2153'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2153'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO. NW 104 SET IN
 HV2153'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2153'COVER WITH LID LABELED SURVEY.
 HV2153'
 HV2153'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2153'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NW 104-AZ. SET
 HV2153'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2153'COVER WITH LID LABELED SURVEY.
 HV2153'
 HV2153'NO GEOGRAPHIC POSITION.
 HV2153
 HV2153                          STATION RECOVERY (1960)
 HV2153
 HV2153'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2153'IN WASHINGTON DC.
 HV2153'LOCATED AT THE Y INTERSECTION OF MILITARY RD. N.W. AND WESTERN
 HV2153'AVE. N.W. 20.04 FT NORTHEAST OF CROSS CUT IN A RIM OF MANHOLE
 HV2153'ADJACENT TO MILITARY RD, AND 23.45 FT SOUTHEAST OF A CROSS CUT
 HV2153'IN A RIM OF MANHOLE ADJACENT TO WESTERN AVE, AND 33.08 FT SOUTHWEST
 HV2153'OF THE WEST CORNER OF CONC. BASE OF FLAG POLE.  A STANDARD
 HV2153'BRASS DISC SET IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY
 HV2153'A STANDARD MANHOLE COVER WITH LID LABELED SURVEY.
 HV2153
 HV2153                          STATION RECOVERY (1971)
 HV2153
 HV2153'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2153'STATION AND REFERENCE POINTS RECOVERED AS DESCRIBED IN GOOD
 HV2153'CONDITION.
 HV2153
 HV2153                          STATION RECOVERY (1979)
 HV2153
 HV2153'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV2153'1.05 MILES NORTHWEST ALONG WISCONSIN AVENUE FROM TENLEY CIRCLE IN
 HV2153'TENLEYTOWN, THENCE 0.05 MILE EAST ALONG WESTERN AVENUE TO THE
 HV2153'JUNCTION OF MILITARY ROAD, SET AT THE NORTHWEST CORNER OF MILITARY
 HV2153'ROAD UNDER A 12 INCH ROUND METAL MANHOLE COVER CAST SURVEY, 13.5
 HV2153'FEET NORTHEAST OF THE NORTHEAST CURB OF THE ROAD, 35.5 FEET SOUTHEAST
 HV2153'OF THE SOUTHEAST CURB OF WESTERN AVENUE, 35.3 FEET WEST OF A FLAG
 HV2153'POLE IN FRONT OF WASHINGTON CLINIC MEDICAL CENTER.
 HV2153'THE MARK IS ABOVE LEVEL WITH ROAD.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2152 ***********************************************************************
 HV2152  DESIGNATION -  NW 105 DCDHT RESET
 HV2152  PID         -  HV2152
 HV2152  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2152  COUNTRY     -  US
 HV2152  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2152
 HV2152                         *CURRENT SURVEY CONTROL
 HV2152  ______________________________________________________________________
 HV2152* NAD 83(1986) POSITION- 38 57 20.     (N) 077 05 33.     (W)   SCALED
 HV2152* NAVD 88 ORTHO HEIGHT -    91.896 (meters)      301.50  (feet) ADJUSTED
 HV2152  ______________________________________________________________________
 HV2152  GEOID HEIGHT    -        -31.912 (meters)                     GEOID18
 HV2152  DYNAMIC HEIGHT  -         91.847 (meters)      301.33  (feet) COMP
 HV2152  MODELED GRAVITY -    980,084.6   (mgal)                       NAVD 88
 HV2152
 HV2152  VERT ORDER      -  SECOND    CLASS 0
 HV2152
 HV2152.The horizontal coordinates were scaled from a map and have
 HV2152.an estimated accuracy of +/- 6 seconds.
 HV2152
 HV2152.The orthometric height was determined by differential leveling and
 HV2152.adjusted by the NATIONAL GEODETIC SURVEY
 HV2152.in June 1991.
 HV2152
 HV2152.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2152.GEOID18 height accuracy estimate available here.
 HV2152
 HV2152.Click photographs - Photos may exist for this station.
 HV2152
 HV2152.The dynamic height is computed by dividing the NAVD 88
 HV2152.geopotential number by the normal gravity value computed on the
 HV2152.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2152.degrees latitude (g = 980.6199 gals.).
 HV2152
 HV2152.The modeled gravity was interpolated from observed gravity values.
 HV2152
 HV2152
 HV2152_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ186139(NAD 83)
 HV2152
 HV2152                          SUPERSEDED SURVEY CONTROL
 HV2152
 HV2152  NGVD 29 (??/??/??)   92.47   (m)          303.4    (f) RESET       3  
 HV2152
 HV2152.Superseded values are not recommended for survey control.
 HV2152
 HV2152.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2152.See file dsdata.pdf to determine how the superseded data were derived.
 HV2152
 HV2152_MARKER: DD = SURVEY DISK
 HV2152_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2152_SP_SET: MONUMENT
 HV2152_STAMPING: USCGS NO NW 105 RESET
 HV2152_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2152
 HV2152  HISTORY     - Date     Condition        Report By
 HV2152  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2152  HISTORY     - 1961     GOOD             MADHOP
 HV2152
 HV2152                          STATION DESCRIPTION
 HV2152
 HV2152'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1961
 HV2152'IN WASHINGTON DC.
 HV2152'LOCATED AT THE INTERSECTION OF RIVER RD. N.W. AND WESTERN AVE.
 HV2152'N.W.  IN THE SOUTHEAST CORNER OF THE INTERSECTION, 16.03 FT
 HV2152'NORTHEAST OF X CUT IN MANHOLE RING, AND 7.81 FT NORTHWEST OF
 HV2152'X CUT IN MANHOLE RIM, AND 9.85 FT SOUTHWEST OF X CUT IN MANHOLE
 HV2152'RIM.  A STANDARD BRASS DISC SET IN TOP OF 12 IN CONCRETE MONUMENT
 HV2152'SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID LABELED SURVEY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV3975 ***********************************************************************
 HV3975  DESIGNATION -  NW 105 RESET
 HV3975  PID         -  HV3975
 HV3975  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV3975  COUNTRY     -  US
 HV3975  USGS QUAD   -  WASHINGTON WEST (2016)
 HV3975
 HV3975                         *CURRENT SURVEY CONTROL
 HV3975  ______________________________________________________________________
 HV3975* NAD 83(1993) POSITION- 38 57 23.35934(N) 077 05 27.98632(W)   ADJUSTED
 HV3975* NAVD 88 ORTHO HEIGHT -    92.25  (+/-2cm)      302.7   (feet) VERTCON3
 HV3975  ______________________________________________________________________
 HV3975  GEOID HEIGHT    -        -31.913 (meters)                     GEOID18
 HV3975  LAPLACE CORR    -         -2.32  (seconds)                    DEFLEC18
 HV3975  HORZ ORDER      -  THIRD
 HV3975  VERT ORDER      -  THIRD ? (See Below)
 HV3975
 HV3975.The horizontal coordinates were established by classical geodetic methods
 HV3975.and adjusted by the National Geodetic Survey in November 1994.
 HV3975
 HV3975.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV3975.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV3975
 HV3975.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV3975.GEOID18 height accuracy estimate available here.
 HV3975
 HV3975.The vertical order pertains to the NGVD 29 superseded value.
 HV3975
 HV3975.Click photographs - Photos may exist for this station.
 HV3975
 HV3975.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV3975
 HV3975. The following values were computed from the NAD 83(1993) position.
 HV3975
 HV3975;                    North         East     Units Scale Factor Converg.
 HV3975;SPC MD       -   143,179.974   392,103.259   MT  0.99995084   -0 03 25.9
 HV3975;SPC MD       -   469,749.63  1,286,425.44   sFT  0.99995084   -0 03 25.9
 HV3975;SPC VA N     - 2,144,108.018 3,622,113.057   MT  0.99996585   +0 52 45.5
 HV3975;SPC VA N     - 7,034,461.06 11,883,549.25   sFT  0.99996585   +0 52 45.5
 HV3975;UTM  18      - 4,314,027.488   318,807.987   MT  1.00000428   -1 18 54.4
 HV3975
 HV3975!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV3975!SPC MD       -   0.99999053  x   0.99995084  =   0.99994137
 HV3975!SPC VA N     -   0.99999053  x   0.99996585  =   0.99995638
 HV3975!UTM  18      -   0.99999053  x   1.00000428  =   0.99999481
 HV3975
 HV3975:                Primary Azimuth Mark                     Grid Az
 HV3975:SPC MD       -  NW 105 RESET AZ MK                       135 47 09.8
 HV3975:SPC VA N     -  NW 105 RESET AZ MK                       134 50 58.4
 HV3975:UTM  18      -  NW 105 RESET AZ MK                       137 02 38.3
 HV3975
 HV3975_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1880714027(NAD 83)
 HV3975
 HV3975|---------------------------------------------------------------------|
 HV3975| PID    Reference Object                     Distance      Geod. Az  |
 HV3975|                                                           dddmmss.s |
 HV3975| HV3972 N W 104 A 1960                      328.247 METERS 04236     |
 HV3975| DC6935 NW 105 RESET AZ MK                                 1354343.9 |
 HV3975| HV3983 N W 105 1960                        157.906 METERS 22955     |
 HV3975|---------------------------------------------------------------------|
 HV3975
 HV3975                          SUPERSEDED SURVEY CONTROL
 HV3975
 HV3975  NAD 83(1991)-  38 57 23.35856(N)    077 05 27.98737(W) AD(       ) 3
 HV3975  NAD 83(1986)-  38 57 23.35850(N)    077 05 27.99706(W) AD(       ) 3
 HV3975  NAD 27      -  38 57 22.96560(N)    077 05 29.06210(W) AD(       ) 3
 HV3975  NGVD 29              92.47   (m)          303.4    (f) LEVELING    3  
 HV3975
 HV3975.Superseded values are not recommended for survey control.
 HV3975
 HV3975.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV3975.See file dsdata.pdf to determine how the superseded data were derived.
 HV3975
 HV3975_MARKER: DS = TRIANGULATION STATION DISK
 HV3975_SETTING: 0 = UNSPECIFIED SETTING
 HV3975
 HV3975  HISTORY     - Date     Condition        Report By
 HV3975  HISTORY     - 1961     MONUMENTED       MADHOP
 HV3975  HISTORY     - 1971     GOOD             NGS
 HV3975
 HV3975                          STATION DESCRIPTION
 HV3975
 HV3975'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1961 (CJM)
 HV3975'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV3975'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NW 105 RESET
 HV3975'SET IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV3975'MANHOLE COVER WITH LID LABELED SURVEY.
 HV3975'
 HV3975'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV3975'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GA NO NW 105-AZ. SET
 HV3975'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV3975'COVER WITH LID LABELED SURVEY.
 HV3975'
 HV3975'NO GEOGRAPHIC POSITION
 HV3975
 HV3975                          STATION RECOVERY (1971)
 HV3975
 HV3975'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV3975'THE STATION AND ALL REFERENCE POINTS RECOVERED IN GOOD CONDITION
 HV3975'AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2151 ***********************************************************************
 HV2151  DESIGNATION -  NW 106 DCDHT
 HV2151  PID         -  HV2151
 HV2151  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2151  COUNTRY     -  US
 HV2151  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2151
 HV2151                         *CURRENT SURVEY CONTROL
 HV2151  ______________________________________________________________________
 HV2151* NAD 83(1993) POSITION- 38 56 56.09751(N) 077 06 03.38050(W)   ADJUSTED
 HV2151* NAVD 88 ORTHO HEIGHT -    85.939 (meters)      281.95  (feet) ADJUSTED
 HV2151  ______________________________________________________________________
 HV2151  GEOID HEIGHT    -        -31.910 (meters)                     GEOID18
 HV2151  LAPLACE CORR    -         -1.98  (seconds)                    DEFLEC18
 HV2151  DYNAMIC HEIGHT  -         85.893 (meters)      281.80  (feet) COMP
 HV2151  MODELED GRAVITY -    980,086.4   (mgal)                       NAVD 88
 HV2151
 HV2151  HORZ ORDER      -  SECOND
 HV2151  VERT ORDER      -  SECOND    CLASS 0
 HV2151
 HV2151.The horizontal coordinates were established by classical geodetic methods
 HV2151.and adjusted by the National Geodetic Survey in November 1994.
 HV2151
 HV2151.The orthometric height was determined by differential leveling and
 HV2151.adjusted by the NATIONAL GEODETIC SURVEY
 HV2151.in June 1991.
 HV2151
 HV2151.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2151.GEOID18 height accuracy estimate available here.
 HV2151
 HV2151.Click photographs - Photos may exist for this station.
 HV2151
 HV2151.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2151
 HV2151.The dynamic height is computed by dividing the NAVD 88
 HV2151.geopotential number by the normal gravity value computed on the
 HV2151.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2151.degrees latitude (g = 980.6199 gals.).
 HV2151
 HV2151.The modeled gravity was interpolated from observed gravity values.
 HV2151
 HV2151. The following values were computed from the NAD 83(1993) position.
 HV2151
 HV2151;                    North         East     Units Scale Factor Converg.
 HV2151;SPC MD       -   142,340.229   391,250.165   MT  0.99995066   -0 03 48.1
 HV2151;SPC MD       -   466,994.57  1,283,626.58   sFT  0.99995066   -0 03 48.1
 HV2151;SPC VA N     - 2,143,254.429 3,621,273.790   MT  0.99996507   +0 52 23.4
 HV2151;SPC VA N     - 7,031,660.57 11,880,795.76   sFT  0.99996507   +0 52 23.4
 HV2151;UTM  18      - 4,313,206.626   317,936.616   MT  1.00000817   -1 19 15.9
 HV2151
 HV2151!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2151!SPC MD       -   0.99999152  x   0.99995066  =   0.99994218
 HV2151!SPC VA N     -   0.99999152  x   0.99996507  =   0.99995659
 HV2151!UTM  18      -   0.99999152  x   1.00000817  =   0.99999969
 HV2151
 HV2151:                Primary Azimuth Mark                     Grid Az
 HV2151:SPC MD       -  N W 105 A 1960                           046 01 24.3
 HV2151:SPC VA N     -  N W 105 A 1960                           045 05 12.8
 HV2151:UTM  18      -  N W 105 A 1960                           047 16 52.1
 HV2151
 HV2151_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1793613206(NAD 83)
 HV2151
 HV2151|---------------------------------------------------------------------|
 HV2151| PID    Reference Object                     Distance      Geod. Az  |
 HV2151|                                                           dddmmss.s |
 HV2151| HV3988 N W 105 A 1960                      452.680 METERS 0455736.2 |
 HV2151| HV4050 N W 106 A 1960                      109.242 METERS 22230     |
 HV2151|---------------------------------------------------------------------|
 HV2151
 HV2151                          SUPERSEDED SURVEY CONTROL
 HV2151
 HV2151  NAD 83(1991)-  38 56 56.09665(N)    077 06 03.38174(W) AD(       ) 2
 HV2151  NAD 83(1986)-  38 56 56.09710(N)    077 06 03.39075(W) AD(       ) 2
 HV2151  NAD 27      -  38 56 55.69880(N)    077 06 04.46180(W) AD(       ) 2
 HV2151  NGVD 29              86.16   (m)          282.7    (f) LEVELING    3  
 HV2151  NGVD 29 (11/26/84)   86.163  (m)          282.69   (f) ADJUSTED    2 0
 HV2151
 HV2151.Superseded values are not recommended for survey control.
 HV2151
 HV2151.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2151.See file dsdata.pdf to determine how the superseded data were derived.
 HV2151
 HV2151_MARKER: DD = SURVEY DISK
 HV2151_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2151_SP_SET: MONUMENT
 HV2151_STAMPING: USCGS NO NW 106
 HV2151_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2151
 HV2151  HISTORY     - Date     Condition        Report By
 HV2151  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2151  HISTORY     - 1960     GOOD             MADHOP
 HV2151  HISTORY     - 1971     GOOD             NGS
 HV2151
 HV2151                          STATION DESCRIPTION
 HV2151
 HV2151'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2151'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2151'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO. NW 106 SET
 HV2151'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2151'COVER WITH LID LABELED SURVEY.
 HV2151
 HV2151                          STATION RECOVERY (1960)
 HV2151
 HV2151'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2151'IN WASHINGTON DC.
 HV2151'LOCATED IN THE CENTER OF WESTMORELAND CIRCLE, 110.65 FT
 HV2151'SOUTHWEST OF THE WEST CORNER OF D.C.-M.D. STONE, AND 53.58 FT
 HV2151'WEST OF CROSS CUT IN RIM OF MANHOLE, AND 52.63 FT NORTHWEST OF
 HV2151'CROSS CUT IN RIM OF MANHOLE.  A STANDARD BRASS DISC SET IN TOP
 HV2151'OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER
 HV2151'WITH THE LID LABELED SURVEY.
 HV2151
 HV2151                          STATION RECOVERY (1971)
 HV2151
 HV2151'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2151'STATION WAS RECOVERED IN GOOD CONDITION, AS PREVIOUSLY DESCRIBED,
 HV2151'AT THE CENTER OF WESTMORELAND CIRCLE, HOWEVER THERE ARE SEVERAL
 HV2151'MANHOLE COVERS IN THE VICINITY, AND CARE MUST BE USED IN LOCATING
 HV2151'THE CORRECT ONES FOR THE REFERENCE MEASUREMENTS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2171 ***********************************************************************
 HV2171  DESIGNATION -  NW 107 DCDHT
 HV2171  PID         -  HV2171
 HV2171  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2171  COUNTRY     -  US
 HV2171  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2171
 HV2171                         *CURRENT SURVEY CONTROL
 HV2171  ______________________________________________________________________
 HV2171* NAD 83(1993) POSITION- 38 56 27.29661(N) 077 06 13.38393(W)   ADJUSTED
 HV2171* NAVD 88 ORTHO HEIGHT -    78.556 (meters)      257.73  (feet) ADJUSTED
 HV2171  ______________________________________________________________________
 HV2171  GEOID HEIGHT    -        -31.917 (meters)                     GEOID18
 HV2171  LAPLACE CORR    -         -1.72  (seconds)                    DEFLEC18
 HV2171  DYNAMIC HEIGHT  -         78.513 (meters)      257.59  (feet) COMP
 HV2171  MODELED GRAVITY -    980,087.2   (mgal)                       NAVD 88
 HV2171
 HV2171  HORZ ORDER      -  SECOND
 HV2171  VERT ORDER      -  SECOND    CLASS 0
 HV2171
 HV2171.The horizontal coordinates were established by classical geodetic methods
 HV2171.and adjusted by the National Geodetic Survey in November 1994.
 HV2171
 HV2171.The orthometric height was determined by differential leveling and
 HV2171.adjusted by the NATIONAL GEODETIC SURVEY
 HV2171.in June 1991.
 HV2171
 HV2171.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2171.GEOID18 height accuracy estimate available here.
 HV2171
 HV2171.Click photographs - Photos may exist for this station.
 HV2171
 HV2171.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2171
 HV2171.The dynamic height is computed by dividing the NAVD 88
 HV2171.geopotential number by the normal gravity value computed on the
 HV2171.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2171.degrees latitude (g = 980.6199 gals.).
 HV2171
 HV2171.The modeled gravity was interpolated from observed gravity values.
 HV2171
 HV2171. The following values were computed from the NAD 83(1993) position.
 HV2171
 HV2171;                    North         East     Units Scale Factor Converg.
 HV2171;SPC MD       -   141,452.400   391,008.283   MT  0.99995049   -0 03 54.3
 HV2171;SPC MD       -   464,081.75  1,282,833.01   sFT  0.99995049   -0 03 54.3
 HV2171;SPC VA N     - 2,142,362.753 3,621,046.449   MT  0.99996428   +0 52 17.2
 HV2171;SPC VA N     - 7,028,735.13 11,880,049.89   sFT  0.99996428   +0 52 17.2
 HV2171;UTM  18      - 4,312,324.269   317,675.292   MT  1.00000935   -1 19 21.3
 HV2171
 HV2171!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2171!SPC MD       -   0.99999268  x   0.99995049  =   0.99994317
 HV2171!SPC VA N     -   0.99999268  x   0.99996428  =   0.99995696
 HV2171!UTM  18      -   0.99999268  x   1.00000935  =   1.00000203
 HV2171
 HV2171:                Primary Azimuth Mark                     Grid Az
 HV2171:SPC MD       -  N W 106 B 1960                           001 20 38.6
 HV2171:SPC VA N     -  N W 106 B 1960                           000 24 27.1
 HV2171:UTM  18      -  N W 106 B 1960                           002 36 05.6
 HV2171
 HV2171_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1767512324(NAD 83)
 HV2171
 HV2171|---------------------------------------------------------------------|
 HV2171| PID    Reference Object                     Distance      Geod. Az  |
 HV2171|                                                           dddmmss.s |
 HV2171| HV4062 N W 106 B 1960                      APPROX. 0.5 KM 0011644.3 |
 HV2171| HV4058 N W 107 A 1960                      241.650 METERS 18437     |
 HV2171|---------------------------------------------------------------------|
 HV2171
 HV2171                          SUPERSEDED SURVEY CONTROL
 HV2171
 HV2171  NAD 83(1991)-  38 56 27.29568(N)    077 06 13.38530(W) AD(       ) 2
 HV2171  NAD 83(1986)-  38 56 27.29570(N)    077 06 13.39461(W) AD(       ) 2
 HV2171  NAD 27      -  38 56 26.89640(N)    077 06 14.46590(W) AD(       ) 2
 HV2171  NGVD 29              78.78   (m)          258.5    (f) LEVELING    3  
 HV2171  NGVD 29 (11/26/84)   78.780  (m)          258.46   (f) ADJUSTED    2 0
 HV2171
 HV2171.Superseded values are not recommended for survey control.
 HV2171
 HV2171.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2171.See file dsdata.pdf to determine how the superseded data were derived.
 HV2171
 HV2171_MARKER: DD = SURVEY DISK
 HV2171_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2171_SP_SET: MONUMENT
 HV2171_STAMPING: USCGS NO NW 107
 HV2171_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2171
 HV2171  HISTORY     - Date     Condition        Report By
 HV2171  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2171  HISTORY     - 1960     GOOD             MADHOP
 HV2171  HISTORY     - 1971     GOOD             NGS
 HV2171
 HV2171                          STATION DESCRIPTION
 HV2171
 HV2171'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2171'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2171'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NW 107 SET IN
 HV2171'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV2171'MANHOLE COVER WITH LID LABELED SURVEY.
 HV2171
 HV2171                          STATION RECOVERY (1960)
 HV2171
 HV2171'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2171'IN WASHINGTON DC.
 HV2171'LOCATED ON DALECARLIA PARKWAY, SOUTH OF WEST MORELAND CIRCLE,
 HV2171'AND NORTH 800 FT. PLUS OR MINUS FROM ROCKWOOD PKWY.  16.98 FT.
 HV2171'SOUTHEAST OF RAMSET NAIL IN TOP OF CURB, AND 7.33 FT. EAST OF
 HV2171'RAMSET NAIL IN TOP OF CURB, AND 13.97 FT. NORTHEAST OF RAMSET
 HV2171'RAIL IN TOP OF CURB. (STA. IS EAST OF THE EAST SIDE OF
 HV2171'DALECARLIA PKWY) A STANDARD BRASS DISC SET IN TOP OF A 12 IN.
 HV2171'CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH
 HV2171'LID LABELED SURVEY.
 HV2171
 HV2171                          STATION RECOVERY (1971)
 HV2171
 HV2171'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2171'THE STATION AND ALL REFERENCE POINTS RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2169 ***********************************************************************
 HV2169  DESIGNATION -  NW 108
 HV2169  PID         -  HV2169
 HV2169  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2169  COUNTRY     -  US
 HV2169  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2169
 HV2169                         *CURRENT SURVEY CONTROL
 HV2169  ______________________________________________________________________
 HV2169* NAD 83(1993) POSITION- 38 56 06.32543(N) 077 06 51.00628(W)   ADJUSTED
 HV2169* NAVD 88 ORTHO HEIGHT -    45.017 (meters)      147.69  (feet) ADJUSTED
 HV2169  ______________________________________________________________________
 HV2169  GEOID HEIGHT    -        -31.915 (meters)                     GEOID18
 HV2169  LAPLACE CORR    -         -1.93  (seconds)                    DEFLEC18
 HV2169  DYNAMIC HEIGHT  -         44.993 (meters)      147.61  (feet) COMP
 HV2169  MODELED GRAVITY -    980,095.2   (mgal)                       NAVD 88
 HV2169
 HV2169  HORZ ORDER      -  SECOND
 HV2169  VERT ORDER      -  SECOND    CLASS 0
 HV2169
 HV2169.The horizontal coordinates were established by classical geodetic methods
 HV2169.and adjusted by the National Geodetic Survey in November 1994.
 HV2169
 HV2169.The orthometric height was determined by differential leveling and
 HV2169.adjusted by the NATIONAL GEODETIC SURVEY
 HV2169.in June 1991.
 HV2169
 HV2169.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2169.GEOID18 height accuracy estimate available here.
 HV2169
 HV2169.Click photographs - Photos may exist for this station.
 HV2169
 HV2169.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2169
 HV2169.The dynamic height is computed by dividing the NAVD 88
 HV2169.geopotential number by the normal gravity value computed on the
 HV2169.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2169.degrees latitude (g = 980.6199 gals.).
 HV2169
 HV2169.The modeled gravity was interpolated from observed gravity values.
 HV2169
 HV2169. The following values were computed from the NAD 83(1993) position.
 HV2169
 HV2169;                    North         East     Units Scale Factor Converg.
 HV2169;SPC MD       -   140,806.819   390,101.465   MT  0.99995038   -0 04 18.0
 HV2169;SPC MD       -   461,963.71  1,279,857.89   sFT  0.99995038   -0 04 18.0
 HV2169;SPC VA N     - 2,141,702.427 3,620,150.292   MT  0.99996371   +0 51 53.7
 HV2169;SPC VA N     - 7,026,568.71 11,877,109.75   sFT  0.99996371   +0 51 53.7
 HV2169;UTM  18      - 4,311,698.705   316,754.469   MT  1.00001349   -1 19 44.4
 HV2169
 HV2169!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2169!SPC MD       -   0.99999794  x   0.99995038  =   0.99994832
 HV2169!SPC VA N     -   0.99999794  x   0.99996371  =   0.99996165
 HV2169!UTM  18      -   0.99999794  x   1.00001349  =   1.00001143
 HV2169
 HV2169:                Primary Azimuth Mark                     Grid Az
 HV2169:SPC MD       -  N W 108 A 1960                           189 38 11.4
 HV2169:SPC VA N     -  N W 108 A 1960                           188 41 59.7
 HV2169:UTM  18      -  N W 108 A 1960                           190 53 37.8
 HV2169
 HV2169_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1675411698(NAD 83)
 HV2169
 HV2169|---------------------------------------------------------------------|
 HV2169| PID    Reference Object                     Distance      Geod. Az  |
 HV2169|                                                           dddmmss.s |
 HV2169| HV3978 N W 107 D 1960                      285.138 METERS 01849     |
 HV2169| DC6936 NW 108 AZ MK                                       1422641.6 |
 HV2169| HV1984 N W 108 A 1960                      APPROX. 0.9 KM 1893353.4 |
 HV2169|---------------------------------------------------------------------|
 HV2169
 HV2169                          SUPERSEDED SURVEY CONTROL
 HV2169
 HV2169  NAD 83(1991)-  38 56 06.32443(N)    077 06 51.00793(W) AD(       ) 2
 HV2169  NAD 83(1986)-  38 56 06.32423(N)    077 06 51.01774(W) AD(       ) 2
 HV2169  NAD 27      -  38 56 05.92400(N)    077 06 52.08850(W) AD(       ) 2
 HV2169  NGVD 29              45.24   (m)          148.4    (f) LEVELING    3  
 HV2169  NGVD 29 (11/26/84)   45.244  (m)          148.44   (f) ADJUSTED    2 0
 HV2169
 HV2169.Superseded values are not recommended for survey control.
 HV2169
 HV2169.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2169.See file dsdata.pdf to determine how the superseded data were derived.
 HV2169
 HV2169_MARKER: DD = SURVEY DISK
 HV2169_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2169_SP_SET: MONUMENT
 HV2169_STAMPING: USCGS NO NW 108
 HV2169_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2169
 HV2169  HISTORY     - Date     Condition        Report By
 HV2169  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2169  HISTORY     - 1960     GOOD             MADHOP
 HV2169  HISTORY     - 1971     GOOD             NGS
 HV2169
 HV2169                          STATION DESCRIPTION
 HV2169
 HV2169'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2169'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2169'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO. NW 108 SET
 HV2169'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV2169'MANHOLE COVER WITH LID LABELED SURVEY.
 HV2169'
 HV2169'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2169'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NW 108 AZ. SET
 HV2169'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV2169'MANHOLE COVER WITH LID LABELED SURVEY.
 HV2169'
 HV2169'NO GEOGRAPHIC POSITION.
 HV2169
 HV2169                          STATION RECOVERY (1960)
 HV2169
 HV2169'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2169'IN WASHINGTON DC.
 HV2169'LOCATED ON POTOMAC AVE. N.W. IN FRONT OF BRICK BUILDING 5847 ON
 HV2169'SOUTH SIDE OF POTOMAC AVE. 60.87 FT. SOUTH OF NAIL AND WASHER
 HV2169'IN P.E.P.C.O. POLE 25618, AND 110.78 FT. SOUTHWEST OF SOUTHWEST
 HV2169'CORNER OF BUILDING, AND 110.27 FT. WEST OF NAIL AND WASHER IN
 HV2169'P.E.P.C.O. POLE 25250.  A STANDARD BRASS DISC SET IN TOP OF
 HV2169'12 IN. CONCRETE MONUMENT SURMOUNTED BY A STANDARD MONHOLE COVER
 HV2169'WITH LID LABELED SURVEY.
 HV2169
 HV2169                          STATION RECOVERY (1971)
 HV2169
 HV2169'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2169'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE
 HV2169'ORIGINAL DESCRIPTION IS ADEQUATE, WITH THE FOLLOWING
 HV2169'ADDITION--STATION IS 23 FEET SOUTHWEST OF EDGE OF POTOMAC AVE.
 HV2169'
 HV2169'NW 108 AZ. WAS RECOVERED IN GOOD CONDITION AS DESCRIBED, WITH
 HV2169'THE FOLLOWING ADDITION--AZ. MARK IS 2 FEET EAST OF PEPCO POLE 24813.
 HV2169'
 HV2169'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2169'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2168 ***********************************************************************
 HV2168  DESIGNATION -  NW 109 DCDHT
 HV2168  PID         -  HV2168
 HV2168  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2168  COUNTRY     -  US
 HV2168  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2168
 HV2168                         *CURRENT SURVEY CONTROL
 HV2168  ______________________________________________________________________
 HV2168* NAD 83(1993) POSITION- 38 55 08.83878(N) 077 05 59.32390(W)   ADJUSTED
 HV2168* NAVD 88 ORTHO HEIGHT -    37.441 (meters)      122.84  (feet) ADJUSTED
 HV2168  ______________________________________________________________________
 HV2168  GEOID HEIGHT    -        -31.952 (meters)                     GEOID18
 HV2168  LAPLACE CORR    -         -2.23  (seconds)                    DEFLEC18
 HV2168  DYNAMIC HEIGHT  -         37.420 (meters)      122.77  (feet) COMP
 HV2168  MODELED GRAVITY -    980,090.6   (mgal)                       NAVD 88
 HV2168
 HV2168  HORZ ORDER      -  SECOND
 HV2168  VERT ORDER      -  SECOND    CLASS 0
 HV2168
 HV2168.The horizontal coordinates were established by classical geodetic methods
 HV2168.and adjusted by the National Geodetic Survey in November 1994.
 HV2168
 HV2168.The orthometric height was determined by differential leveling and
 HV2168.adjusted by the NATIONAL GEODETIC SURVEY
 HV2168.in June 1991.
 HV2168
 HV2168.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2168.GEOID18 height accuracy estimate available here.
 HV2168
 HV2168.Click photographs - Photos may exist for this station.
 HV2168
 HV2168.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2168
 HV2168.The dynamic height is computed by dividing the NAVD 88
 HV2168.geopotential number by the normal gravity value computed on the
 HV2168.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2168.degrees latitude (g = 980.6199 gals.).
 HV2168
 HV2168.The modeled gravity was interpolated from observed gravity values.
 HV2168
 HV2168. The following values were computed from the NAD 83(1993) position.
 HV2168
 HV2168;                    North         East     Units Scale Factor Converg.
 HV2168;SPC MD       -   139,032.719   391,344.227   MT  0.99995013   -0 03 45.5
 HV2168;SPC MD       -   456,143.18  1,283,935.18   sFT  0.99995013   -0 03 45.5
 HV2168;SPC VA N     - 2,139,948.855 3,621,421.902   MT  0.99996221   +0 52 26.0
 HV2168;SPC VA N     - 7,020,815.54 11,881,281.69   sFT  0.99996221   +0 52 26.0
 HV2168;UTM  18      - 4,309,897.658   317,958.083   MT  1.00000808   -1 19 10.2
 HV2168
 HV2168!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2168!SPC MD       -   0.99999914  x   0.99995013  =   0.99994927
 HV2168!SPC VA N     -   0.99999914  x   0.99996221  =   0.99996135
 HV2168!UTM  18      -   0.99999914  x   1.00000808  =   1.00000722
 HV2168
 HV2168:                Primary Azimuth Mark                     Grid Az
 HV2168:SPC MD       -  N W 108 C 1960                           279 57 50.2
 HV2168:SPC VA N     -  N W 108 C 1960                           279 01 38.7
 HV2168:UTM  18      -  N W 108 C 1960                           281 13 14.9
 HV2168
 HV2168_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1795809897(NAD 83)
 HV2168
 HV2168|---------------------------------------------------------------------|
 HV2168| PID    Reference Object                     Distance      Geod. Az  |
 HV2168|                                                           dddmmss.s |
 HV2168| HV2117 N W 108 C 1960                      APPROX. 0.8 KM 2795404.7 |
 HV2168|---------------------------------------------------------------------|
 HV2168
 HV2168                          SUPERSEDED SURVEY CONTROL
 HV2168
 HV2168  NAD 83(1991)-  38 55 08.83766(N)    077 05 59.32552(W) AD(       ) 2
 HV2168  NAD 83(1986)-  38 55 08.83739(N)    077 05 59.33538(W) AD(       ) 2
 HV2168  NAD 27      -  38 55 08.43620(N)    077 06 00.40640(W) AD(       ) 2
 HV2168  NGVD 29              37.67   (m)          123.6    (f) LEVELING    3  
 HV2168  NGVD 29 (11/26/84)   37.668  (m)          123.58   (f) ADJUSTED    2 0
 HV2168
 HV2168.Superseded values are not recommended for survey control.
 HV2168
 HV2168.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2168.See file dsdata.pdf to determine how the superseded data were derived.
 HV2168
 HV2168_MARKER: DD = SURVEY DISK
 HV2168_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2168_SP_SET: MONUMENT
 HV2168_STAMPING: USCGS NO NW 109
 HV2168_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2168
 HV2168  HISTORY     - Date     Condition        Report By
 HV2168  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2168  HISTORY     - 1960     GOOD             MADHOP
 HV2168  HISTORY     - 1971     GOOD             NGS
 HV2168  HISTORY     - 20170308 MARK NOT FOUND   NPS
 HV2168
 HV2168                          STATION DESCRIPTION
 HV2168
 HV2168'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2168'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2168'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NW 109 SET
 HV2168'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV2168'MANHOLE COVER LID LABELED SURVEY.
 HV2168
 HV2168                          STATION RECOVERY (1960)
 HV2168
 HV2168'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2168'IN WASHINGTON DC.
 HV2168'LOCATED NEAR THE INTERSECTION OF POTOMAC AVE. N.W. AND W ST. N.W.
 HV2168'19.68 FT NORTHWEST OF NAIL AND WASHER M. P.E.P.C.O. POLE 24530,
 HV2168'AND 17.55 FT SOUTHEAST OF SOUTHWEST CORNER OF STONE WALL IN FRONT
 HV2168'OF BUILDING 4905, AND 33.36 FT SOUTHWEST OF NAIL IN TOP OF POST
 HV2168'ON SOUTH SIDE OF POTOMAC AVE.  A STANDARD BRASS DISC SET IN TOP
 HV2168'OF 12 IN CONC. MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER
 HV2168'LID LABELED SURVEY.
 HV2168
 HV2168                          STATION RECOVERY (1971)
 HV2168
 HV2168'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2168'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE
 HV2168'ORIGINAL DESCRIPITION IS ADEQUATE.
 HV2168'
 HV2168'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2168'IN DISTRICT OF COLUMBIA.
 HV2168
 HV2168                          STATION RECOVERY (2017)
 HV2168
 HV2168'RECOVERY NOTE BY NATIONAL PARK SERVICE 2017 (JCR)
 HV2168'NEW PAVING AND SIDEWALK OF POTOMAC AVENUE NW MOST LIKELY COVERED OR
 HV2168'DESTROYED THE MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2167 ***********************************************************************
 HV2167  DESIGNATION -  NW 110 DCDHT
 HV2167  PID         -  HV2167
 HV2167  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2167  COUNTRY     -  US
 HV2167  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2167
 HV2167                         *CURRENT SURVEY CONTROL
 HV2167  ______________________________________________________________________
 HV2167* NAD 83(1993) POSITION- 38 54 21.34690(N) 077 04 46.45448(W)   ADJUSTED
 HV2167* NAVD 88 ORTHO HEIGHT -    14.929 (meters)       48.98  (feet) ADJUSTED
 HV2167  ______________________________________________________________________
 HV2167  GEOID HEIGHT    -        -31.998 (meters)                     GEOID18
 HV2167  LAPLACE CORR    -         -2.77  (seconds)                    DEFLEC18
 HV2167  DYNAMIC HEIGHT  -         14.921 (meters)       48.95  (feet) COMP
 HV2167  MODELED GRAVITY -    980,091.6   (mgal)                       NAVD 88
 HV2167
 HV2167  HORZ ORDER      -  SECOND
 HV2167  VERT ORDER      -  SECOND    CLASS 0
 HV2167
 HV2167.The horizontal coordinates were established by classical geodetic methods
 HV2167.and adjusted by the National Geodetic Survey in November 1994.
 HV2167
 HV2167.The orthometric height was determined by differential leveling and
 HV2167.adjusted by the NATIONAL GEODETIC SURVEY
 HV2167.in June 1991.
 HV2167
 HV2167.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2167.GEOID18 height accuracy estimate available here.
 HV2167
 HV2167.Click photographs - Photos may exist for this station.
 HV2167
 HV2167.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2167
 HV2167.The dynamic height is computed by dividing the NAVD 88
 HV2167.geopotential number by the normal gravity value computed on the
 HV2167.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2167.degrees latitude (g = 980.6199 gals.).
 HV2167
 HV2167.The modeled gravity was interpolated from observed gravity values.
 HV2167
 HV2167. The following values were computed from the NAD 83(1993) position.
 HV2167
 HV2167;                    North         East     Units Scale Factor Converg.
 HV2167;SPC MD       -   137,566.553   393,098.306   MT  0.99994999   -0 02 59.8
 HV2167;SPC MD       -   451,332.93  1,289,690.03   sFT  0.99994999   -0 02 59.8
 HV2167;SPC VA N     - 2,138,511.537 3,623,199.730   MT  0.99996102   +0 53 11.5
 HV2167;SPC VA N     - 7,016,099.93 11,887,114.45   sFT  0.99996102   +0 53 11.5
 HV2167;UTM  18      - 4,308,393.294   319,679.678   MT  1.00000040   -1 18 23.1
 HV2167
 HV2167!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2167!SPC MD       -   1.00000268  x   0.99994999  =   0.99995267
 HV2167!SPC VA N     -   1.00000268  x   0.99996102  =   0.99996370
 HV2167!UTM  18      -   1.00000268  x   1.00000040  =   1.00000308
 HV2167
 HV2167:                Primary Azimuth Mark                     Grid Az
 HV2167:SPC MD       -  GEORGETOWN UNIV LOWER SPIRE              079 56 44.5
 HV2167:SPC VA N     -  GEORGETOWN UNIV LOWER SPIRE              079 00 33.2
 HV2167:UTM  18      -  GEORGETOWN UNIV LOWER SPIRE              081 12 07.8
 HV2167
 HV2167_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1967908393(NAD 83)
 HV2167
 HV2167|---------------------------------------------------------------------|
 HV2167| PID    Reference Object                     Distance      Geod. Az  |
 HV2167|                                                           dddmmss.s |
 HV2167| HV3961 GEORGETOWN UNIV LOWER SPIRE         APPROX. 0.6 KM 0795344.7 |
 HV2167|---------------------------------------------------------------------|
 HV2167
 HV2167                          SUPERSEDED SURVEY CONTROL
 HV2167
 HV2167  NAD 83(1991)-  38 54 21.34568(N)    077 04 46.45608(W) AD(       ) 2
 HV2167  NAD 83(1986)-  38 54 21.34530(N)    077 04 46.46611(W) AD(       ) 2
 HV2167  NAD 27      -  38 54 20.94280(N)    077 04 47.54130(W) AD(       ) 2
 HV2167  NGVD 29              15.16   (m)           49.7    (f) LEVELING    3  
 HV2167  NGVD 29 (11/26/84)   15.159  (m)           49.73   (f) ADJUSTED    2 0
 HV2167
 HV2167.Superseded values are not recommended for survey control.
 HV2167
 HV2167.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2167.See file dsdata.pdf to determine how the superseded data were derived.
 HV2167
 HV2167_MARKER: DD = SURVEY DISK
 HV2167_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2167_SP_SET: MONUMENT
 HV2167_STAMPING: USCGS NO NW 110
 HV2167_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2167
 HV2167  HISTORY     - Date     Condition        Report By
 HV2167  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2167  HISTORY     - 1960     GOOD             MADHOP
 HV2167  HISTORY     - 1971     GOOD             NGS
 HV2167  HISTORY     - 1972     GOOD             NGS
 HV2167  HISTORY     - 20170308 MARK NOT FOUND   NPS
 HV2167
 HV2167                          STATION DESCRIPTION
 HV2167
 HV2167'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2167'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2167'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO. NW 110 SET
 HV2167'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV2167'MANHOLE COVER WITH LID LABELED SURVEY.
 HV2167
 HV2167                          STATION RECOVERY (1960)
 HV2167
 HV2167'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2167'IN WASHINGTON DC.
 HV2167'LOCATED AT THE Y INTERSECTIN OF FOXHALL RD AND CANAL RD. NEAR
 HV2167'THE CENTER OF THE ISLAND IN FOXHALL RD.  23.27 FT NORTH WEST OF
 HV2167'A CROSS CUT IN RIM OF MANHOLE (ON ISLAND), AND 52.86 FT SOUTHWEST
 HV2167'OF A CROSS CUT IN RIM OF MANHOLE ON NORTH SIDE OF FOXHALL RD.,
 HV2167'AND 31.88 FT NORTH OF RAMSET NAIL IN TOP OF CONC. POST ON SOUTH
 HV2167'SIDE OF FOXHALL RD.  A STANDARD BRASS DISC SET IN TOP OF 12
 HV2167'IN CONC. MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH
 HV2167'LID LABELED SURVEY.
 HV2167
 HV2167                          STATION RECOVERY (1971)
 HV2167
 HV2167'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2167'STATION AND REFERENCE POINTS RECOVERED IN GOOD CONDITION.
 HV2167'
 HV2167'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2167'IN DIST. OF COL.
 HV2167
 HV2167                          STATION RECOVERY (1972)
 HV2167
 HV2167'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1972 (RDO)
 HV2167'STATION AND NORTHERN REFERENCE MARK WERE RECOVERED IN GOOD
 HV2167'CONDITION AS DESCRIBED.  THE OTHER TWO REFERENCE MARKS WERE
 HV2167'NOT FOUND, THOUGH THE OBJECTS ON WHICH THEY WERE REPORTED SET
 HV2167'APPEARED TO EXIST ROUGHLY AS DRAWN IN THE 1960 DESCRIPTION.
 HV2167'
 HV2167'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2167'IN D.C.
 HV2167
 HV2167                          STATION RECOVERY (2017)
 HV2167
 HV2167'RECOVERY NOTE BY NATIONAL PARK SERVICE 2017 (JCR)
 HV2167'MARK WAS NOT FOUND. IT APPEARED THAT RECENT WORK BY UTILITY COMPANY
 HV2167'MAY HAVE DESTROYED THE MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2164 ***********************************************************************
 HV2164  DESIGNATION -  NW 111 DCDHT
 HV2164  PID         -  HV2164
 HV2164  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2164  COUNTRY     -  US
 HV2164  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2164
 HV2164                         *CURRENT SURVEY CONTROL
 HV2164  ______________________________________________________________________
 HV2164* NAD 83(1993) POSITION- 38 54 08.20811(N) 077 03 50.08492(W)   ADJUSTED
 HV2164* NAVD 88 ORTHO HEIGHT -     3.068 (meters)       10.07  (feet) ADJUSTED
 HV2164  ______________________________________________________________________
 HV2164  GEOID HEIGHT    -        -32.028 (meters)                     GEOID18
 HV2164  LAPLACE CORR    -         -2.70  (seconds)                    DEFLEC18
 HV2164  DYNAMIC HEIGHT  -          3.066 (meters)       10.06  (feet) COMP
 HV2164  MODELED GRAVITY -    980,093.0   (mgal)                       NAVD 88
 HV2164
 HV2164  HORZ ORDER      -  SECOND
 HV2164  VERT ORDER      -  SECOND    CLASS 0
 HV2164
 HV2164.The horizontal coordinates were established by classical geodetic methods
 HV2164.and adjusted by the National Geodetic Survey in November 1994.
 HV2164
 HV2164.The orthometric height was determined by differential leveling and
 HV2164.adjusted by the NATIONAL GEODETIC SURVEY
 HV2164.in June 1991.
 HV2164
 HV2164.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2164.GEOID18 height accuracy estimate available here.
 HV2164
 HV2164.Click photographs - Photos may exist for this station.
 HV2164
 HV2164.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2164
 HV2164.The dynamic height is computed by dividing the NAVD 88
 HV2164.geopotential number by the normal gravity value computed on the
 HV2164.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2164.degrees latitude (g = 980.6199 gals.).
 HV2164
 HV2164.The modeled gravity was interpolated from observed gravity values.
 HV2164
 HV2164. The following values were computed from the NAD 83(1993) position.
 HV2164
 HV2164;                    North         East     Units Scale Factor Converg.
 HV2164;SPC MD       -   137,160.344   394,456.162   MT  0.99994995   -0 02 24.4
 HV2164;SPC MD       -   450,000.23  1,294,144.92   sFT  0.99994995   -0 02 24.4
 HV2164;SPC VA N     - 2,138,127.570 3,624,564.059   MT  0.99996071   +0 53 46.6
 HV2164;SPC VA N     - 7,014,840.20 11,891,590.58   sFT  0.99996071   +0 53 46.6
 HV2164;UTM  18      - 4,307,957.388   321,028.366   MT  0.99999443   -1 17 47.3
 HV2164
 HV2164!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2164!SPC MD       -   1.00000454  x   0.99994995  =   0.99995449
 HV2164!SPC VA N     -   1.00000454  x   0.99996071  =   0.99996525
 HV2164!UTM  18      -   1.00000454  x   0.99999443  =   0.99999897
 HV2164
 HV2164:                Primary Azimuth Mark                     Grid Az
 HV2164:SPC MD       -  NW 121 DCDHT                             139 00 56.4
 HV2164:SPC VA N     -  NW 121 DCDHT                             138 04 45.4
 HV2164:UTM  18      -  NW 121 DCDHT                             140 16 19.3
 HV2164
 HV2164_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2102807957(NAD 83)
 HV2164
 HV2164|---------------------------------------------------------------------|
 HV2164| PID    Reference Object                     Distance      Geod. Az  |
 HV2164|                                                           dddmmss.s |
 HV2164| HV4453 POWER 1913                          146.914 METERS 10419     |
 HV2164| HV2172 NW 121 DCDHT                        APPROX. 1.0 KM 1385832.0 |
 HV2164| HV2175 WASH BASE USE 1956                  477.496 METERS 2913942.0 |
 HV2164|---------------------------------------------------------------------|
 HV2164
 HV2164                          SUPERSEDED SURVEY CONTROL
 HV2164
 HV2164  NAD 83(1991)-  38 54 08.20686(N)    077 03 50.08644(W) AD(       ) 2
 HV2164  NAD 83(1986)-  38 54 08.20657(N)    077 03 50.09694(W) AD(       ) 2
 HV2164  NAD 27      -  38 54 07.80350(N)    077 03 51.17250(W) AD(       ) 2
 HV2164  NGVD 29               3.30   (m)           10.8    (f) LEVELING    3  
 HV2164  NGVD 29 (11/26/84)    3.300  (m)           10.83   (f) ADJUSTED    2 0
 HV2164
 HV2164.Superseded values are not recommended for survey control.
 HV2164
 HV2164.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2164.See file dsdata.pdf to determine how the superseded data were derived.
 HV2164
 HV2164_MARKER: DD = SURVEY DISK
 HV2164_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2164_SP_SET: MONUMENT
 HV2164_STAMPING: USCGS NO NW 111
 HV2164_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2164
 HV2164  HISTORY     - Date     Condition        Report By
 HV2164  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2164  HISTORY     - 1960     GOOD             MADHOP
 HV2164  HISTORY     - 1966     GOOD             LOCENG
 HV2164  HISTORY     - 1971     GOOD             NGS
 HV2164
 HV2164                          STATION DESCRIPTION
 HV2164
 HV2164'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2164'STATION IS A STANDARD DISC STAMPED DISTRICT OF COLUMBIA DEPARTMENT
 HV2164'OF HIGHWAYS AND TRAFFIC - USC AND GS NO. NW 111 SET IN TOP OF 12
 HV2164'IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH
 HV2164'LID LABELED SURVEY.
 HV2164
 HV2164                          STATION RECOVERY (1960)
 HV2164
 HV2164'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2164'IN WASHINGTON DC.
 HV2164'LOCATED NEAR K STREET N.W. BETWEEN THE RAILROAD TRACKS AND THE
 HV2164'SEA WALL WHICH PARALLEL K ST. N.W.  23.75 FT EAST OF THE WEST
 HV2164'END OF SEA WALL, AND 6.87 FT NORTHEAST OF CROSS CUT IN BASE
 HV2164'PLATES OF STEEL FENCE, AND 4.35 FT NORTH OF CROSS CUT IN BASE
 HV2164'PLATE OF STEEL FENCE, AND 9.05 FT NORTHWEST OF CROSS CUT IN BASE
 HV2164'PLATE OF STEEL FENCE.  A STANDARD BRASS DISC SET IN TOP OF 12
 HV2164'IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH
 HV2164'LID LABELED SURVEY.
 HV2164
 HV2164                          STATION RECOVERY (1966)
 HV2164
 HV2164'RECOVERY NOTE BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (CJM)
 HV2164'RECOVERED BY DE LEUW CATHER CO.
 HV2164'
 HV2164'N W 111 GOOD CONDITION ALL TIES AS SHOWN.
 HV2164
 HV2164                          STATION RECOVERY (1971)
 HV2164
 HV2164'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2164'STATION WAS RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE ORIGINAL
 HV2164'DESCRIPTION IS ADEQUATE, WITH THE FOLLOWING ADDITIONS--STATION IS
 HV2164'1 FOOT NORTH OF EDGE OF SEAWALL, 4.8 FEET SOUTH OF SOUTH RAIL OF
 HV2164'RAILROAD TRACKS, AND 333.5 FEET WEST OF CENTER LINE OF THE
 HV2164'EXTENSION OF WISCONSIN AVENUE, WHICH ENDS AT THE SEAWALL.
 HV2164'
 HV2164'NOTE--THE MANHOLE COVER IS GONE AND THE MARK WAS FOUND COVERED
 HV2164'WITH DEBRIS.
 HV2164'
 HV2164'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2164'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2166 ***********************************************************************
 HV2166  DESIGNATION -  NW 112 DCDHT
 HV2166  PID         -  HV2166
 HV2166  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2166  COUNTRY     -  US
 HV2166  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2166
 HV2166                         *CURRENT SURVEY CONTROL
 HV2166  ______________________________________________________________________
 HV2166* NAD 83(1993) POSITION- 38 55 04.88171(N) 077 04 10.17686(W)   ADJUSTED
 HV2166* NAVD 88 ORTHO HEIGHT -    72.627 (meters)      238.28  (feet) ADJUSTED
 HV2166  ______________________________________________________________________
 HV2166  GEOID HEIGHT    -        -31.991 (meters)                     GEOID18
 HV2166  LAPLACE CORR    -         -2.88  (seconds)                    DEFLEC18
 HV2166  DYNAMIC HEIGHT  -         72.588 (meters)      238.15  (feet) COMP
 HV2166  MODELED GRAVITY -    980,089.4   (mgal)                       NAVD 88
 HV2166
 HV2166  HORZ ORDER      -  SECOND
 HV2166  VERT ORDER      -  SECOND    CLASS 0
 HV2166
 HV2166.The horizontal coordinates were established by classical geodetic methods
 HV2166.and adjusted by the National Geodetic Survey in November 1994.
 HV2166
 HV2166.The orthometric height was determined by differential leveling and
 HV2166.adjusted by the NATIONAL GEODETIC SURVEY
 HV2166.in June 1991.
 HV2166
 HV2166.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2166.GEOID18 height accuracy estimate available here.
 HV2166
 HV2166.Click photographs - Photos may exist for this station.
 HV2166
 HV2166.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2166
 HV2166.The dynamic height is computed by dividing the NAVD 88
 HV2166.geopotential number by the normal gravity value computed on the
 HV2166.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2166.degrees latitude (g = 980.6199 gals.).
 HV2166
 HV2166.The modeled gravity was interpolated from observed gravity values.
 HV2166
 HV2166. The following values were computed from the NAD 83(1993) position.
 HV2166
 HV2166;                    North         East     Units Scale Factor Converg.
 HV2166;SPC MD       -   138,908.262   393,973.383   MT  0.99995012   -0 02 37.0
 HV2166;SPC MD       -   455,734.86  1,292,561.01   sFT  0.99995012   -0 02 37.0
 HV2166;SPC VA N     - 2,139,867.385 3,624,052.772   MT  0.99996211   +0 53 34.1
 HV2166;SPC VA N     - 7,020,548.25 11,889,913.14   sFT  0.99996211   +0 53 34.1
 HV2166;UTM  18      - 4,309,715.554   320,584.013   MT  0.99999639   -1 18 01.5
 HV2166
 HV2166!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2166!SPC MD       -   0.99999362  x   0.99995012  =   0.99994374
 HV2166!SPC VA N     -   0.99999362  x   0.99996211  =   0.99995573
 HV2166!UTM  18      -   0.99999362  x   0.99999639  =   0.99999001
 HV2166
 HV2166:                Primary Azimuth Mark                     Grid Az
 HV2166:SPC MD       -  N W 111 A 1960                           178 05 29.8
 HV2166:SPC VA N     -  N W 111 A 1960                           177 09 18.7
 HV2166:UTM  18      -  N W 111 A 1960                           179 20 54.3
 HV2166
 HV2166_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2058409715(NAD 83)
 HV2166
 HV2166|---------------------------------------------------------------------|
 HV2166| PID    Reference Object                     Distance      Geod. Az  |
 HV2166|                                                           dddmmss.s |
 HV2166| HV4204 N W 111 A 1960                      APPROX. 1.4 KM 1780252.8 |
 HV2166| HV4077 N W 112 A 1960                      288.845 METERS 32610     |
 HV2166|---------------------------------------------------------------------|
 HV2166
 HV2166                          SUPERSEDED SURVEY CONTROL
 HV2166
 HV2166  NAD 83(1991)-  38 55 04.88054(N)    077 04 10.17823(W) AD(       ) 2
 HV2166  NAD 83(1986)-  38 55 04.88048(N)    077 04 10.18754(W) AD(       ) 2
 HV2166  NAD 27      -  38 55 04.47760(N)    077 04 11.26240(W) AD(       ) 2
 HV2166  NGVD 29              72.85   (m)          239.0    (f) LEVELING    3  
 HV2166  NGVD 29 (11/26/84)   72.854  (m)          239.02   (f) ADJUSTED    2 0
 HV2166
 HV2166.Superseded values are not recommended for survey control.
 HV2166
 HV2166.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2166.See file dsdata.pdf to determine how the superseded data were derived.
 HV2166
 HV2166_MARKER: DD = SURVEY DISK
 HV2166_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2166_SP_SET: MONUMENT
 HV2166_STAMPING: USCGS NO NW 112
 HV2166_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2166
 HV2166  HISTORY     - Date     Condition        Report By
 HV2166  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2166  HISTORY     - 1960     GOOD             MADHOP
 HV2166  HISTORY     - 1971     GOOD             NGS
 HV2166
 HV2166                          STATION DESCRIPTION
 HV2166
 HV2166'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2166'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2166'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO NW 112 SET IN TOP
 HV2166'OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2166'COVER WITH LID LABELED SURVEY.
 HV2166
 HV2166                          STATION RECOVERY (1960)
 HV2166
 HV2166'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2166'IN WASHINGTON DC.
 HV2166'LOCATED NEAR THE Y INTERSECTION OF WISCONSIN AVE. N.W. AND 35TH
 HV2166'ST.  16.74 FT SOUTHEAST OF CROSS CUT IN RIM OF MANHOLE IN THE
 HV2166'ROADWAY OF WISCONSIN AVE., AND 41.33 FT NORTH OF CROSS CUT IN
 HV2166'RIM OF MANHOLE LOCATED ON THE CONCRETE WALK PARALLEL TO WISCONSIN
 HV2166'AVE., AND 6.44 FT NORTHEAST OF CROSS CUT IN TOP CURB OF WISCONSIN
 HV2166'AVE.  A STANDARD BRASS DISC SET IN TOP OF 12 IN CONCRETE MONUMENT
 HV2166'SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID LABELED SURVEY.
 HV2166
 HV2166                          STATION RECOVERY (1971)
 HV2166
 HV2166'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2166'THE STATION AND REFERENCE POINTS RECOVERED AND FOUND IN GOOD
 HV2166'CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2156 ***********************************************************************
 HV2156  DESIGNATION -  NW 113
 HV2156  PID         -  HV2156
 HV2156  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2156  COUNTRY     -  US
 HV2156  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2156
 HV2156                         *CURRENT SURVEY CONTROL
 HV2156  ______________________________________________________________________
 HV2156* NAD 83(1993) POSITION- 38 55 42.08705(N) 077 04 22.90061(W)   ADJUSTED
 HV2156* NAVD 88 ORTHO HEIGHT -   111.350 (meters)      365.32  (feet) ADJUSTED
 HV2156  ______________________________________________________________________
 HV2156  GEOID HEIGHT    -        -31.969 (meters)                     GEOID18
 HV2156  LAPLACE CORR    -         -2.95  (seconds)                    DEFLEC18
 HV2156  DYNAMIC HEIGHT  -        111.290 (meters)      365.12  (feet) COMP
 HV2156  MODELED GRAVITY -    980,085.9   (mgal)                       NAVD 88
 HV2156
 HV2156  HORZ ORDER      -  SECOND
 HV2156  VERT ORDER      -  SECOND    CLASS 0
 HV2156
 HV2156.The horizontal coordinates were established by classical geodetic methods
 HV2156.and adjusted by the National Geodetic Survey in November 1994.
 HV2156
 HV2156.The orthometric height was determined by differential leveling and
 HV2156.adjusted by the NATIONAL GEODETIC SURVEY
 HV2156.in June 1991.
 HV2156
 HV2156.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2156.GEOID18 height accuracy estimate available here.
 HV2156
 HV2156.Click photographs - Photos may exist for this station.
 HV2156
 HV2156.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2156
 HV2156.The dynamic height is computed by dividing the NAVD 88
 HV2156.geopotential number by the normal gravity value computed on the
 HV2156.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2156.degrees latitude (g = 980.6199 gals.).
 HV2156
 HV2156.The modeled gravity was interpolated from observed gravity values.
 HV2156
 HV2156. The following values were computed from the NAD 83(1993) position.
 HV2156
 HV2156;                    North         East     Units Scale Factor Converg.
 HV2156;SPC MD       -   140,055.754   393,667.793   MT  0.99995027   -0 02 45.0
 HV2156;SPC MD       -   459,499.59  1,291,558.42   sFT  0.99995027   -0 02 45.0
 HV2156;SPC VA N     - 2,141,009.742 3,623,728.465   MT  0.99996307   +0 53 26.2
 HV2156;SPC VA N     - 7,024,296.13 11,888,849.14   sFT  0.99996307   +0 53 26.2
 HV2156;UTM  18      - 4,310,869.526   320,303.655   MT  0.99999763   -1 18 10.6
 HV2156
 HV2156!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2156!SPC MD       -   0.99998755  x   0.99995027  =   0.99993782
 HV2156!SPC VA N     -   0.99998755  x   0.99996307  =   0.99995062
 HV2156!UTM  18      -   0.99998755  x   0.99999763  =   0.99998518
 HV2156
 HV2156:                Primary Azimuth Mark                     Grid Az
 HV2156:SPC MD       -  NW 113 AZ MK                             132 27 54.0
 HV2156:SPC VA N     -  NW 113 AZ MK                             131 31 42.8
 HV2156:UTM  18      -  NW 113 AZ MK                             133 43 19.6
 HV2156
 HV2156_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2030310869(NAD 83)
 HV2156
 HV2156|---------------------------------------------------------------------|
 HV2156| PID    Reference Object                     Distance      Geod. Az  |
 HV2156|                                                           dddmmss.s |
 HV2156| DC6937 NW 113 AZ MK                                       1322509.0 |
 HV2156| HV4198 N W 112 C 1960                      316.282 METERS 18031     |
 HV2156|---------------------------------------------------------------------|
 HV2156
 HV2156                          SUPERSEDED SURVEY CONTROL
 HV2156
 HV2156  NAD 83(1991)-  38 55 42.08600(N)    077 04 22.90189(W) AD(       ) 2
 HV2156  NAD 83(1986)-  38 55 42.08646(N)    077 04 22.91087(W) AD(       ) 2
 HV2156  NAD 27      -  38 55 41.68460(N)    077 04 23.98500(W) AD(       ) 2
 HV2156  NGVD 29             111.58   (m)          366.1    (f) LEVELING    3  
 HV2156  NGVD 29 (11/26/84)  111.575  (m)          366.06   (f) ADJUSTED    2 0
 HV2156
 HV2156.Superseded values are not recommended for survey control.
 HV2156
 HV2156.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2156.See file dsdata.pdf to determine how the superseded data were derived.
 HV2156
 HV2156_MARKER: DD = SURVEY DISK
 HV2156_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV2156_SP_SET: MONUMENT
 HV2156_STAMPING: USCGS NO NW 113
 HV2156_MARK LOGO: DCDHT
 HV2156_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2156_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV2156+SATELLITE: SATELLITE OBSERVATIONS - November 10, 2020
 HV2156
 HV2156  HISTORY     - Date     Condition        Report By
 HV2156  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2156  HISTORY     - 1960     GOOD             MADHOP
 HV2156  HISTORY     - 1971     GOOD             NGS
 HV2156  HISTORY     - 20201110 GOOD             NGS
 HV2156
 HV2156                          STATION DESCRIPTION
 HV2156
 HV2156'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2156'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2156'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO. NW 113 SET IN
 HV2156'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2156'COVER WITH LID LABELED SURVEY.
 HV2156'
 HV2156'NO GEOGRAPHIC POSITION
 HV2156'
 HV2156'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2156'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NW 113-AZ.  SET
 HV2156'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV2156'MANHOLE COVER WITH LID LABELED SURVEY.
 HV2156
 HV2156                          STATION RECOVERY (1960)
 HV2156
 HV2156'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2156'IN WASHINGTON DC.
 HV2156'LOCATED AT INTERSECTION OF WISCONSIN AVE. N.W. AND MASS. AVE.
 HV2156'N.W. ON THE SOUTHEAST CORNER OF INTERSECTION.  36.55 FT NORTHWEST
 HV2156'OF CROSS CUT IN RIM OF MANHOLE ADJACENT TO MASS. AVE., AND 5.57
 HV2156'FT SOUTHEAST OF CROSSCUT IN RIM OF MANHOLE AT INTERSECTION,
 HV2156'AND 6.03 FT NORTHEAST OF CROSS CUT IN RIM OF MANHOLE ADJACENT
 HV2156'TO WISCONSIN AVE.  A STANDARD BRASS DISC SET IN TOP OF 12 IN
 HV2156'CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH
 HV2156'LID LABELED SURVEY.
 HV2156
 HV2156                          STATION RECOVERY (1971)
 HV2156
 HV2156'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2156'AZ MK WAS RECOVERED AS PREVIOUSLY DESCRIBED.  ORIGINAL DESCRIPTION
 HV2156'IS ADEQUATE.
 HV2156'
 HV2156'STATION WAS RECOVERED IN GOOD CONDITION, AS PREVIOUSLY
 HV2156'DESCRIBED.  IT IS IN THE NORTH TIP OF A SHRUBBERY BED, 1 FOOT
 HV2156'EAST OF SIDEWALK, AND THE MANHOLE LID IS ABOUT 2 INCHES BELOW
 HV2156'GROUND.
 HV2156
 HV2156                          STATION RECOVERY (2020)
 HV2156
 HV2156'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JH)
 HV2156'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2150 ***********************************************************************
 HV2150  DESIGNATION -  NW 114 DCDHT
 HV2150  PID         -  HV2150
 HV2150  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2150  COUNTRY     -  US
 HV2150  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2150
 HV2150                         *CURRENT SURVEY CONTROL
 HV2150  ______________________________________________________________________
 HV2150* NAD 83(1993) POSITION- 38 56 16.40287(N) 077 05 09.04689(W)   ADJUSTED
 HV2150* NAVD 88 ORTHO HEIGHT -   118.643 (meters)      389.25  (feet) ADJUSTED
 HV2150  ______________________________________________________________________
 HV2150  GEOID HEIGHT    -        -31.939 (meters)                     GEOID18
 HV2150  LAPLACE CORR    -         -2.32  (seconds)                    DEFLEC18
 HV2150  DYNAMIC HEIGHT  -        118.579 (meters)      389.04  (feet) COMP
 HV2150  MODELED GRAVITY -    980,082.4   (mgal)                       NAVD 88
 HV2150
 HV2150  HORZ ORDER      -  SECOND
 HV2150  VERT ORDER      -  SECOND    CLASS 0
 HV2150
 HV2150.The horizontal coordinates were established by classical geodetic methods
 HV2150.and adjusted by the National Geodetic Survey in November 1994.
 HV2150
 HV2150.The orthometric height was determined by differential leveling and
 HV2150.adjusted by the NATIONAL GEODETIC SURVEY
 HV2150.in June 1991.
 HV2150
 HV2150.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2150.GEOID18 height accuracy estimate available here.
 HV2150
 HV2150.Click photographs - Photos may exist for this station.
 HV2150
 HV2150.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2150
 HV2150.The dynamic height is computed by dividing the NAVD 88
 HV2150.geopotential number by the normal gravity value computed on the
 HV2150.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2150.degrees latitude (g = 980.6199 gals.).
 HV2150
 HV2150.The modeled gravity was interpolated from observed gravity values.
 HV2150
 HV2150. The following values were computed from the NAD 83(1993) position.
 HV2150
 HV2150;                    North         East     Units Scale Factor Converg.
 HV2150;SPC MD       -   141,114.874   392,557.312   MT  0.99995043   -0 03 14.0
 HV2150;SPC MD       -   462,974.38  1,287,915.11   sFT  0.99995043   -0 03 14.0
 HV2150;SPC VA N     - 2,142,050.586 3,622,600.808   MT  0.99996398   +0 52 57.4
 HV2150;SPC VA N     - 7,027,710.96 11,885,149.48   sFT  0.99996398   +0 52 57.4
 HV2150;UTM  18      - 4,311,952.811   319,216.626   MT  1.00000246   -1 18 40.5
 HV2150
 HV2150!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2150!SPC MD       -   0.99998640  x   0.99995043  =   0.99993683
 HV2150!SPC VA N     -   0.99998640  x   0.99996398  =   0.99995038
 HV2150!UTM  18      -   0.99998640  x   1.00000246  =   0.99998886
 HV2150
 HV2150:                Primary Azimuth Mark                     Grid Az
 HV2150:SPC MD       -  N W 113 B 1960                           134 04 52.7
 HV2150:SPC VA N     -  N W 113 B 1960                           133 08 41.3
 HV2150:UTM  18      -  N W 113 B 1960                           135 20 19.2
 HV2150
 HV2150_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1921611952(NAD 83)
 HV2150
 HV2150|---------------------------------------------------------------------|
 HV2150| PID    Reference Object                     Distance      Geod. Az  |
 HV2150|                                                           dddmmss.s |
 HV2150| HV4174 N W 113 B 1960                      APPROX. 0.7 KM 1340138.7 |
 HV2150| HV8190 AMERICAN UNIV                       122.662 METERS 23029     |
 HV2150|---------------------------------------------------------------------|
 HV2150
 HV2150                          SUPERSEDED SURVEY CONTROL
 HV2150
 HV2150  NAD 83(1991)-  38 56 16.40189(N)    077 05 09.04810(W) AD(       ) 2
 HV2150  NAD 83(1986)-  38 56 16.40232(N)    077 05 09.05695(W) AD(       ) 2
 HV2150  NAD 27      -  38 56 16.00250(N)    077 05 10.13000(W) AD(       ) 2
 HV2150  NGVD 29             118.86   (m)          390.0    (f) LEVELING    3  
 HV2150  NGVD 29 (11/26/84)  118.864  (m)          389.97   (f) ADJUSTED    2 0
 HV2150
 HV2150.Superseded values are not recommended for survey control.
 HV2150
 HV2150.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2150.See file dsdata.pdf to determine how the superseded data were derived.
 HV2150
 HV2150_MARKER: DD = SURVEY DISK
 HV2150_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2150_SP_SET: MONUMENT
 HV2150_STAMPING: USCGS NO NW 114
 HV2150_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2150
 HV2150  HISTORY     - Date     Condition        Report By
 HV2150  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2150  HISTORY     - 1960     GOOD             MADHOP
 HV2150  HISTORY     - 1966     SEE DESCRIPTION  DCDHT
 HV2150  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV2150
 HV2150                          STATION DESCRIPTION
 HV2150
 HV2150'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2150'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2150'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO. NW 114 SET IN
 HV2150'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2150'COVER WITH LID LABELED SURVEY.
 HV2150
 HV2150                          STATION RECOVERY (1960)
 HV2150
 HV2150'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2150'IN WASHINGTON DC.
 HV2150'LOCATED IN WARD CIRCLE, 7.75 FT NORTHEAST OF A CROSS CUT IN
 HV2150'RIM OF WATER MANHOLE, AND 13.57 FT NORTHWEST OF A CROSS CUT IN
 HV2150'RIM OF WATER MANHOLE, AND 16.58 FT SOUTHEAST OF THE SOUTHWEST
 HV2150'CORNER OF THE STATUE, AND 11.28 FT SOUTHEAST OF THE SOUTHEAST
 HV2150'CORNER OF THE STATUE.  A STANDARD BRASS DISC SET IN TOP OF A
 HV2150'12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER
 HV2150'WITH LID LABELED SURVEY.
 HV2150
 HV2150                          STATION RECOVERY (1966)
 HV2150
 HV2150'RECOVERY NOTE BY DC DEPARTMENT OF HIGHWAYS AND TRAFFIC 1966
 HV2150'STATION ACCIDENTLY DESTROYED BY NATIONAL PARK SERVICE WORKMAN
 HV2150'ABOUT 5/27/66.
 HV2150'
 HV2150'DISK WAS RECEIVED IN THE ROCKVILLE OFFICE 6/13/66.
 HV2150'
 HV2150'THIS CARD PREPARED IN ROCKVILLE OFFICE.
 HV2150
 HV2150                          STATION RECOVERY (1971)
 HV2150
 HV2150'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2150'THIS STATION WAS NOT RECOVERED AFTER ONE HALF DAY SEARCH.  IF
 HV2150'MEASUREMENTS FROM REFERENCE POINTS ARE CORRECT THE STATION IS TO
 HV2150'BE CONSIDERED LOST.  EVIDENCE SHOW THAT SOME WORK HAS BEEN DONE
 HV2150'IN THE AREA AND GROUND DISTURBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2149 ***********************************************************************
 HV2149  DESIGNATION -  NW 115
 HV2149  PID         -  HV2149
 HV2149  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2149  COUNTRY     -  US
 HV2149  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2149
 HV2149                         *CURRENT SURVEY CONTROL
 HV2149  ______________________________________________________________________
 HV2149* NAD 83(1993) POSITION- 38 56 47.23782(N) 077 04 42.98826(W)   ADJUSTED
 HV2149* NAVD 88 ORTHO HEIGHT -   115.594 (meters)      379.24  (feet) ADJUSTED
 HV2149  ______________________________________________________________________
 HV2149  GEOID HEIGHT    -        -31.939 (meters)                     GEOID18
 HV2149  LAPLACE CORR    -         -2.70  (seconds)                    DEFLEC18
 HV2149  DYNAMIC HEIGHT  -        115.532 (meters)      379.04  (feet) COMP
 HV2149  MODELED GRAVITY -    980,082.5   (mgal)                       NAVD 88
 HV2149
 HV2149  HORZ ORDER      -  SECOND
 HV2149  VERT ORDER      -  SECOND    CLASS 0
 HV2149
 HV2149.The horizontal coordinates were established by classical geodetic methods
 HV2149.and adjusted by the National Geodetic Survey in November 1994.
 HV2149
 HV2149.The orthometric height was determined by differential leveling and
 HV2149.adjusted by the NATIONAL GEODETIC SURVEY
 HV2149.in June 1991.
 HV2149
 HV2149.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2149.GEOID18 height accuracy estimate available here.
 HV2149
 HV2149.Click photographs - Photos may exist for this station.
 HV2149
 HV2149.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2149
 HV2149.The dynamic height is computed by dividing the NAVD 88
 HV2149.geopotential number by the normal gravity value computed on the
 HV2149.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2149.degrees latitude (g = 980.6199 gals.).
 HV2149
 HV2149.The modeled gravity was interpolated from observed gravity values.
 HV2149
 HV2149. The following values were computed from the NAD 83(1993) position.
 HV2149
 HV2149;                    North         East     Units Scale Factor Converg.
 HV2149;SPC MD       -   142,065.129   393,185.693   MT  0.99995061   -0 02 57.6
 HV2149;SPC MD       -   466,092.01  1,289,976.73   sFT  0.99995061   -0 02 57.6
 HV2149;SPC VA N     - 2,143,010.997 3,623,213.583   MT  0.99996483   +0 53 13.6
 HV2149;SPC VA N     - 7,030,861.91 11,887,159.90   sFT  0.99996483   +0 53 13.6
 HV2149;UTM  18      - 4,312,889.094   319,865.743   MT  0.99999957   -1 18 25.0
 HV2149
 HV2149!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2149!SPC MD       -   0.99998687  x   0.99995061  =   0.99993749
 HV2149!SPC VA N     -   0.99998687  x   0.99996483  =   0.99995171
 HV2149!UTM  18      -   0.99998687  x   0.99999957  =   0.99998644
 HV2149
 HV2149:                Primary Azimuth Mark                     Grid Az
 HV2149:SPC MD       -  N W 115 A                                033 14 20.7
 HV2149:SPC VA N     -  N W 115 A                                032 18 09.5
 HV2149:UTM  18      -  N W 115 A                                034 29 48.1
 HV2149
 HV2149_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1986512889(NAD 83)
 HV2149
 HV2149|---------------------------------------------------------------------|
 HV2149| PID    Reference Object                     Distance      Geod. Az  |
 HV2149|                                                           dddmmss.s |
 HV2149| DC6938 NW 115 AZ MK                                       0022051.7 |
 HV2149| HV4202 N W 115 A                           APPROX. 0.6 KM 0331123.1 |
 HV2149| HV4168 N W 114 A 1960                      468.503 METERS 2142801.7 |
 HV2149|---------------------------------------------------------------------|
 HV2149
 HV2149                          SUPERSEDED SURVEY CONTROL
 HV2149
 HV2149  NAD 83(1991)-  38 56 47.23695(N)    077 04 42.98931(W) AD(       ) 2
 HV2149  NAD 83(1986)-  38 56 47.23674(N)    077 04 42.99872(W) AD(       ) 2
 HV2149  NAD 27      -  38 56 46.83780(N)    077 04 44.07180(W) AD(       ) 2
 HV2149  NGVD 29             115.82   (m)          380.0    (f) LEVELING    3  
 HV2149  NGVD 29 (11/26/84)  115.817  (m)          379.98   (f) ADJUSTED    2 0
 HV2149
 HV2149.Superseded values are not recommended for survey control.
 HV2149
 HV2149.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2149.See file dsdata.pdf to determine how the superseded data were derived.
 HV2149
 HV2149_MARKER: DD = SURVEY DISK
 HV2149_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2149_SP_SET: MONUMENT
 HV2149_STAMPING: USCGS NO NW 115
 HV2149_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2149
 HV2149  HISTORY     - Date     Condition        Report By
 HV2149  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2149  HISTORY     - 1960     GOOD             MADHOP
 HV2149  HISTORY     - 1971     GOOD             NGS
 HV2149
 HV2149                          STATION DESCRIPTION
 HV2149
 HV2149'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2149'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2149'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO. NW 115 SET IN
 HV2149'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2149'COVER WITH LID LABELED SURVEY.
 HV2149'
 HV2149'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2149'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NW 115 AZ. SET
 HV2149'IN THE TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV2149'MANHOLE COVER WITH LID LABELED SURVEY.
 HV2149'
 HV2149'NO GEOGRAPHIC POSITION
 HV2149
 HV2149                          STATION RECOVERY (1960)
 HV2149
 HV2149'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2149'IN WASHINGTON DC.
 HV2149'LOCATED IN TENLEY CIRCLE ON THE EAST ISLAND.  37.36 FT SOUTHEAST OF
 HV2149'A NAIL AND WASHER IN A 18 INCH SYCAMORE TREE, AND 20.17 FT NORTHWEST
 HV2149'OF A CROSS CUT IN THE RIM OF A P.E.P.C.O. MANHOLE, AND 25.28 FT
 HV2149'WEST OF A NAIL AND WASHER IN A 22 INCH SYCAMORE TREE.  A STANDARD
 HV2149'BRASS DISK SET IN TOP OF A 12 INCH CONCRETE MONUMENT SURMOUNTED BY A
 HV2149'STANDARD MANHOLE COVER WITH LID LABELED SURVEY.
 HV2149
 HV2149                          STATION RECOVERY (1971)
 HV2149
 HV2149'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2149'STATION RECOVERED AS DESCRIBED.  THE MANHOLE COVER OVER STATION IS
 HV2149'PAINTED YELLOW.
 HV2149'
 HV2149'NW 115 AZ. RECOVERED AS DESCRIBED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2146 ***********************************************************************
 HV2146  DESIGNATION -  NW 115 B DCDHT
 HV2146  PID         -  HV2146
 HV2146  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2146  COUNTRY     -  US
 HV2146  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2146
 HV2146                         *CURRENT SURVEY CONTROL
 HV2146  ______________________________________________________________________
 HV2146* NAD 83(1993) POSITION- 38 57 13.86038(N) 077 04 08.30104(W)   ADJUSTED
 HV2146* NAVD 88 ORTHO HEIGHT -    99.264 (meters)      325.67  (feet) ADJUSTED
 HV2146  ______________________________________________________________________
 HV2146  GEOID HEIGHT    -        -31.946 (meters)                     GEOID18
 HV2146  LAPLACE CORR    -         -2.96  (seconds)                    DEFLEC18
 HV2146  DYNAMIC HEIGHT  -         99.210 (meters)      325.49  (feet) COMP
 HV2146  MODELED GRAVITY -    980,083.4   (mgal)                       NAVD 88
 HV2146
 HV2146  HORZ ORDER      -  SECOND
 HV2146  VERT ORDER      -  SECOND    CLASS 0
 HV2146
 HV2146.The horizontal coordinates were established by classical geodetic methods
 HV2146.and adjusted by the National Geodetic Survey in November 1994.
 HV2146
 HV2146.The orthometric height was determined by differential leveling and
 HV2146.adjusted by the NATIONAL GEODETIC SURVEY
 HV2146.in June 1991.
 HV2146
 HV2146.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2146.GEOID18 height accuracy estimate available here.
 HV2146
 HV2146.Click photographs - Photos may exist for this station.
 HV2146
 HV2146.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2146
 HV2146.The dynamic height is computed by dividing the NAVD 88
 HV2146.geopotential number by the normal gravity value computed on the
 HV2146.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2146.degrees latitude (g = 980.6199 gals.).
 HV2146
 HV2146.The modeled gravity was interpolated from observed gravity values.
 HV2146
 HV2146. The following values were computed from the NAD 83(1993) position.
 HV2146
 HV2146;                    North         East     Units Scale Factor Converg.
 HV2146;SPC MD       -   142,885.383   394,021.575   MT  0.99995077   -0 02 35.8
 HV2146;SPC MD       -   468,783.13  1,292,719.12   sFT  0.99995077   -0 02 35.8
 HV2146;SPC VA N     - 2,143,844.815 3,624,035.960   MT  0.99996558   +0 53 35.3
 HV2146;SPC VA N     - 7,033,597.53 11,889,857.98   sFT  0.99996558   +0 53 35.3
 HV2146;UTM  18      - 4,313,690.841   320,719.468   MT  0.99999579   -1 18 04.0
 HV2146
 HV2146!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2146!SPC MD       -   0.99998944  x   0.99995077  =   0.99994021
 HV2146!SPC VA N     -   0.99998944  x   0.99996558  =   0.99995502
 HV2146!UTM  18      -   0.99998944  x   0.99999579  =   0.99998523
 HV2146
 HV2146:                Primary Azimuth Mark                     Grid Az
 HV2146:SPC MD       -  NW 116 DCDHT                             155 44 03.9
 HV2146:SPC VA N     -  NW 116 DCDHT                             154 47 52.8
 HV2146:UTM  18      -  NW 116 DCDHT                             156 59 32.1
 HV2146
 HV2146_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2071913690(NAD 83)
 HV2146
 HV2146|---------------------------------------------------------------------|
 HV2146| PID    Reference Object                     Distance      Geod. Az  |
 HV2146|                                                           dddmmss.s |
 HV2146| HV2145 NW 116 DCDHT                        APPROX. 0.8 KM 1554128.1 |
 HV2146| HV4199 N W 102 D 1960                      288.265 METERS 33524     |
 HV2146|---------------------------------------------------------------------|
 HV2146
 HV2146                          SUPERSEDED SURVEY CONTROL
 HV2146
 HV2146  NAD 83(1991)-  38 57 13.85964(N)    077 04 08.30216(W) AD(       ) 2
 HV2146  NAD 83(1986)-  38 57 13.85930(N)    077 04 08.31223(W) AD(       ) 2
 HV2146  NAD 27      -  38 57 13.46160(N)    077 04 09.38700(W) AD(       ) 2
 HV2146  NGVD 29              99.49   (m)          326.4    (f) LEVELING    3  
 HV2146  NGVD 29 (11/26/84)   99.490  (m)          326.41   (f) ADJUSTED    2 0
 HV2146
 HV2146.Superseded values are not recommended for survey control.
 HV2146
 HV2146.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2146.See file dsdata.pdf to determine how the superseded data were derived.
 HV2146
 HV2146_MARKER: DD = SURVEY DISK
 HV2146_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2146_SP_SET: SIDEWALK
 HV2146_STAMPING: USCGS NO NW 115-B
 HV2146_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2146
 HV2146  HISTORY     - Date     Condition        Report By
 HV2146  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2146  HISTORY     - 1960     GOOD             MADHOP
 HV2146  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV2146
 HV2146                          STATION DESCRIPTION
 HV2146
 HV2146'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2146'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2146'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. N.W. 115-B
 HV2146'GROUTED IN CONCRETE WALK.
 HV2146
 HV2146                          STATION RECOVERY (1960)
 HV2146
 HV2146'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2146'IN WASHINGTON DC.
 HV2146'LOCATED ON CONNECTICUT AVE. N.W. IN FRONT OF THE METHODIST HOME
 HV2146'4901.  ON THE EAST SIDE OF CONN. AVE. 23.61 FT NORTH OF A NAIL
 HV2146'AND WASHER IN A 3 IN PIN OAK NEXT TO CONN. AVE. CURB FACE, AND
 HV2146'43.79 FT SOUTHEAST OF A NAIL AND WASHER IN A 18 IN PIN OAK ON
 HV2146'NORTH SIDE OF NORTH DRIVEWAY NEXT TO CONN. AVE. CURB FACE, AND
 HV2146'39.19 FT SOUTHWEST OF A NAIL AND WASHER IN 18 IN OAK.  A STANDARD
 HV2146'BRASS DISC GROUTED IN CONCRETE WALK.
 HV2146
 HV2146                          STATION RECOVERY (1971)
 HV2146
 HV2146'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2146'THE STATION WAS LOST WHEN NEW SIDEWALK WAS PUT IN.  A NAIL IN A
 HV2146'1-INCH HOLE FILLED WITH LEAD IN SIDEWALK WAS FOUND AT THE
 HV2146'APPROXIMATE SITE FOR THE STATION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2145 ***********************************************************************
 HV2145  DESIGNATION -  NW 116 DCDHT
 HV2145  PID         -  HV2145
 HV2145  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2145  COUNTRY     -  US
 HV2145  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2145
 HV2145                         *CURRENT SURVEY CONTROL
 HV2145  ______________________________________________________________________
 HV2145* NAD 83(1993) POSITION- 38 56 50.82990(N) 077 03 54.97930(W)   ADJUSTED
 HV2145* NAVD 88 ORTHO HEIGHT -    72.713 (meters)      238.56  (feet) ADJUSTED
 HV2145  ______________________________________________________________________
 HV2145  GEOID HEIGHT    -        -31.958 (meters)                     GEOID18
 HV2145  LAPLACE CORR    -         -3.06  (seconds)                    DEFLEC18
 HV2145  DYNAMIC HEIGHT  -         72.673 (meters)      238.43  (feet) COMP
 HV2145  MODELED GRAVITY -    980,083.4   (mgal)                       NAVD 88
 HV2145
 HV2145  HORZ ORDER      -  SECOND
 HV2145  VERT ORDER      -  SECOND    CLASS 0
 HV2145
 HV2145.The horizontal coordinates were established by classical geodetic methods
 HV2145.and adjusted by the National Geodetic Survey in November 1994.
 HV2145
 HV2145.The orthometric height was determined by differential leveling and
 HV2145.adjusted by the NATIONAL GEODETIC SURVEY
 HV2145.in June 1991.
 HV2145
 HV2145.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2145.GEOID18 height accuracy estimate available here.
 HV2145
 HV2145.Click photographs - Photos may exist for this station.
 HV2145
 HV2145.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2145
 HV2145.The dynamic height is computed by dividing the NAVD 88
 HV2145.geopotential number by the normal gravity value computed on the
 HV2145.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2145.degrees latitude (g = 980.6199 gals.).
 HV2145
 HV2145.The modeled gravity was interpolated from observed gravity values.
 HV2145
 HV2145. The following values were computed from the NAD 83(1993) position.
 HV2145
 HV2145;                    North         East     Units Scale Factor Converg.
 HV2145;SPC MD       -   142,174.983   394,341.819   MT  0.99995063   -0 02 27.5
 HV2145;SPC MD       -   466,452.42  1,293,769.78   sFT  0.99995063   -0 02 27.5
 HV2145;SPC VA N     - 2,143,139.733 3,624,367.776   MT  0.99996493   +0 53 43.6
 HV2145;SPC VA N     - 7,031,284.27 11,890,946.61   sFT  0.99996493   +0 53 43.6
 HV2145;UTM  18      - 4,312,973.551   321,024.055   MT  0.99999445   -1 17 54.9
 HV2145
 HV2145!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2145!SPC MD       -   0.99999361  x   0.99995063  =   0.99994424
 HV2145!SPC VA N     -   0.99999361  x   0.99996493  =   0.99995854
 HV2145!UTM  18      -   0.99999361  x   0.99999445  =   0.99998806
 HV2145
 HV2145:                Primary Azimuth Mark                     Grid Az
 HV2145:SPC MD       -  NW 115 B DCDHT                           335 44 04.0
 HV2145:SPC VA N     -  NW 115 B DCDHT                           334 47 52.9
 HV2145:UTM  18      -  NW 115 B DCDHT                           336 59 31.4
 HV2145
 HV2145_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2102412973(NAD 83)
 HV2145
 HV2145|---------------------------------------------------------------------|
 HV2145| PID    Reference Object                     Distance      Geod. Az  |
 HV2145|                                                           dddmmss.s |
 HV2145| HV4247 N W 116 A 1960                      311.634 METERS 15512     |
 HV2145| HV2146 NW 115 B DCDHT                      APPROX. 0.8 KM 3354136.5 |
 HV2145|---------------------------------------------------------------------|
 HV2145
 HV2145                          SUPERSEDED SURVEY CONTROL
 HV2145
 HV2145  NAD 83(1991)-  38 56 50.82916(N)    077 03 54.98048(W) AD(       ) 2
 HV2145  NAD 83(1986)-  38 56 50.82878(N)    077 03 54.99058(W) AD(       ) 2
 HV2145  NAD 27      -  38 56 50.43100(N)    077 03 56.06640(W) AD(       ) 2
 HV2145  NGVD 29              72.94   (m)          239.3    (f) LEVELING    3  
 HV2145  NGVD 29 (11/26/84)   72.939  (m)          239.30   (f) ADJUSTED    2 0
 HV2145
 HV2145.Superseded values are not recommended for survey control.
 HV2145
 HV2145.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2145.See file dsdata.pdf to determine how the superseded data were derived.
 HV2145
 HV2145_MARKER: DD = SURVEY DISK
 HV2145_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2145_SP_SET: MONUMENT
 HV2145_STAMPING: USCGS NO NW 116
 HV2145_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2145
 HV2145  HISTORY     - Date     Condition        Report By
 HV2145  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2145  HISTORY     - 1960     GOOD             MADHOP
 HV2145  HISTORY     - 1966     GOOD             LOCENG
 HV2145  HISTORY     - 1971     GOOD             NGS
 HV2145
 HV2145                          STATION DESCRIPTION
 HV2145
 HV2145'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2145'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2145'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO. NW 116 SET
 HV2145'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2145'COVER WITH LID LABELED SURVEY.
 HV2145
 HV2145                          STATION RECOVERY (1960)
 HV2145
 HV2145'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2145'IN WASHINGTON DC.
 HV2145'NEAR THE INTERSECTION OF CONNECTICUT AVE. N.W. AND ALBEMARRE ST.
 HV2145'IN FRONT OF BUILDING 4477.  29.55 FT SOUTHWEST OF THE NORTHWEST
 HV2145'CORNER OF BULDING 4477, AND 29.56 FT NORTHWEST OF SOUTHWEST
 HV2145'CORNER OF BUILDING, AND 9.48 FT NORTHWEST OF CROSSCUT IN RIM OF
 HV2145'MANHOLE.  A STANDARD BRASS DISC SET IN TOP OF 12 IN CONCRETE
 HV2145'MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID LABELED
 HV2145'SURVEY.
 HV2145
 HV2145                          STATION RECOVERY (1966)
 HV2145
 HV2145'RECOVERY NOTE BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (CJM)
 HV2145'RECOVERED BY DE LEUW CATHER CO.
 HV2145'
 HV2145'NW 116 GOOD
 HV2145
 HV2145                          STATION RECOVERY (1971)
 HV2145
 HV2145'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2145'STATION AND REFERENCE POINTS RECOVERED AS DESCRIBED IN GOOD
 HV2145'CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2144 ***********************************************************************
 HV2144  DESIGNATION -  NW 117
 HV2144  PID         -  HV2144
 HV2144  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2144  COUNTRY     -  US
 HV2144  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2144
 HV2144                         *CURRENT SURVEY CONTROL
 HV2144  ______________________________________________________________________
 HV2144* NAD 83(1993) POSITION- 38 56 13.09175(N) 077 03 33.04073(W)   ADJUSTED
 HV2144* NAVD 88 ORTHO HEIGHT -    64.199 (meters)      210.63  (feet) ADJUSTED
 HV2144  ______________________________________________________________________
 HV2144  GEOID HEIGHT    -        -31.980 (meters)                     GEOID18
 HV2144  LAPLACE CORR    -         -2.99  (seconds)                    DEFLEC18
 HV2144  DYNAMIC HEIGHT  -         64.165 (meters)      210.51  (feet) COMP
 HV2144  MODELED GRAVITY -    980,086.1   (mgal)                       NAVD 88
 HV2144
 HV2144  HORZ ORDER      -  SECOND
 HV2144  VERT ORDER      -  SECOND    CLASS 0
 HV2144
 HV2144.The horizontal coordinates were established by classical geodetic methods
 HV2144.and adjusted by the National Geodetic Survey in November 1994.
 HV2144
 HV2144.The orthometric height was determined by differential leveling and
 HV2144.adjusted by the NATIONAL GEODETIC SURVEY
 HV2144.in June 1991.
 HV2144
 HV2144.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2144.GEOID18 height accuracy estimate available here.
 HV2144
 HV2144.Click photographs - Photos may exist for this station.
 HV2144
 HV2144.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2144
 HV2144.The dynamic height is computed by dividing the NAVD 88
 HV2144.geopotential number by the normal gravity value computed on the
 HV2144.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2144.degrees latitude (g = 980.6199 gals.).
 HV2144
 HV2144.The modeled gravity was interpolated from observed gravity values.
 HV2144
 HV2144. The following values were computed from the NAD 83(1993) position.
 HV2144
 HV2144;                    North         East     Units Scale Factor Converg.
 HV2144;SPC MD       -   141,010.937   394,869.334   MT  0.99995042   -0 02 13.7
 HV2144;SPC MD       -   462,633.38  1,295,500.47   sFT  0.99995042   -0 02 13.7
 HV2144;SPC VA N     - 2,141,984.447 3,624,914.252   MT  0.99996389   +0 53 57.3
 HV2144;SPC VA N     - 7,027,493.97 11,892,739.51   sFT  0.99996389   +0 53 57.3
 HV2144;UTM  18      - 4,311,798.158   321,525.919   MT  0.99999224   -1 17 40.1
 HV2144
 HV2144!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2144!SPC MD       -   0.99999494  x   0.99995042  =   0.99994537
 HV2144!SPC VA N     -   0.99999494  x   0.99996389  =   0.99995884
 HV2144!UTM  18      -   0.99999494  x   0.99999224  =   0.99998718
 HV2144
 HV2144:                Primary Azimuth Mark                     Grid Az
 HV2144:SPC MD       -  N W 116 B 1960                           335 39 19.0
 HV2144:SPC VA N     -  N W 116 B 1960                           334 43 08.0
 HV2144:UTM  18      -  N W 116 B 1960                           336 54 45.4
 HV2144
 HV2144_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2152511798(NAD 83)
 HV2144
 HV2144|---------------------------------------------------------------------|
 HV2144| PID    Reference Object                     Distance      Geod. Az  |
 HV2144|                                                           dddmmss.s |
 HV2144| HV4320 N W 117 A 1960                      399.992 METERS 15847     |
 HV2144| DC6939 NW 117 AZ MK                                       3353406.7 |
 HV2144| HV4261 N W 116 B 1960                      APPROX. 0.7 KM 3353705.3 |
 HV2144|---------------------------------------------------------------------|
 HV2144
 HV2144                          SUPERSEDED SURVEY CONTROL
 HV2144
 HV2144  NAD 83(1991)-  38 56 13.09093(N)    077 03 33.04197(W) AD(       ) 2
 HV2144  NAD 83(1986)-  38 56 13.09055(N)    077 03 33.05217(W) AD(       ) 2
 HV2144  NAD 27      -  38 56 12.69180(N)    077 03 34.13000(W) AD(       ) 2
 HV2144  NGVD 29              64.43   (m)          211.4    (f) LEVELING    3  
 HV2144  NGVD 29 (11/26/84)   64.428  (m)          211.38   (f) ADJUSTED    2 0
 HV2144
 HV2144.Superseded values are not recommended for survey control.
 HV2144
 HV2144.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2144.See file dsdata.pdf to determine how the superseded data were derived.
 HV2144
 HV2144_MARKER: DD = SURVEY DISK
 HV2144_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV2144_SP_SET: MONUMENT
 HV2144_STAMPING: USCGS NO NW 117
 HV2144_MARK LOGO: DCDHT
 HV2144_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2144_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV2144+SATELLITE: SATELLITE OBSERVATIONS - November 10, 2020
 HV2144
 HV2144  HISTORY     - Date     Condition        Report By
 HV2144  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2144  HISTORY     - 1960     GOOD             MADHOP
 HV2144  HISTORY     - 1966     GOOD             LOCENG
 HV2144  HISTORY     - 1966     GOOD             LOCENG
 HV2144  HISTORY     - 1971     GOOD             NGS
 HV2144  HISTORY     - 20100314 GOOD             GEOCAC
 HV2144  HISTORY     - 20201110 GOOD             NGS
 HV2144
 HV2144                          STATION DESCRIPTION
 HV2144
 HV2144'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2144'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2144'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO. NW 117 SET IN
 HV2144'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2144'COVER WITH LID LABELED SURVEY.
 HV2144'
 HV2144'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2144'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NW 117 AZ. SET
 HV2144'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2144'COVER WITH LID LABELED SURVEY.
 HV2144'
 HV2144'NO GEOGRAPHIC POSITION
 HV2144
 HV2144                          STATION RECOVERY (1960)
 HV2144
 HV2144'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2144'IN WASHINGTON DC.
 HV2144'AT INTERSECTION OF CONNECTICUT AVE. N.W. AND PORTER ST. N.W.
 HV2144'LOCATED ON THE NORTHEAST CORNER OF THE INTERSECTION.  5.70 FT
 HV2144'SOUTH OF CROSS CUT IN SOUTHEAST RIM OF P.E.P.C.O. VAULT, AND
 HV2144'4.45 FT NORTHWEST OF A CROSS CUT IN RIM OF P.E.P.C.O. MANHOLE,
 HV2144'AND 3.63 FT NORTHEAST OF CROSSCUT IN RIM OF A P.E.P.C.O. MANHOLE.
 HV2144'A STANDARD BRASS DISC SET IN TOP OF 12 IN CONCRETE MONUMENT
 HV2144'SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID LABELED SURVEY.
 HV2144
 HV2144                          STATION RECOVERY (1966)
 HV2144
 HV2144'RECOVERY NOTE BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (CRM)
 HV2144'RECOVERED BY DE LEUW CATHER CO.
 HV2144'
 HV2144'N.W. 117 AZ GOOD
 HV2144
 HV2144                          STATION RECOVERY (1966)
 HV2144
 HV2144'RECOVERY NOTE BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (CJM)
 HV2144'RECOVERED BY DE LEUW CATHER CO.
 HV2144'
 HV2144'NW 117 GOOD
 HV2144
 HV2144                          STATION RECOVERY (1971)
 HV2144
 HV2144'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2144'STATION WAS RECOVERED IN GOOD CONDITION AS PREVIOUSLY
 HV2144'DESCRIBED.  THE ORIGINAL DESCRIPTION IS ADEQUATE.
 HV2144
 HV2144                          STATION RECOVERY (2010)
 HV2144
 HV2144'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 HV2144'RECOVERED IN GOOD CONDITION.
 HV2144
 HV2144                          STATION RECOVERY (2020)
 HV2144
 HV2144'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JH)
 HV2144'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2162 ***********************************************************************
 HV2162  DESIGNATION -  NW 118
 HV2162  PID         -  HV2162
 HV2162  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2162  COUNTRY     -  US
 HV2162  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2162
 HV2162                         *CURRENT SURVEY CONTROL
 HV2162  ______________________________________________________________________
 HV2162* NAD 83(1993) POSITION- 38 55 36.60310(N) 077 03 11.86393(W)   ADJUSTED
 HV2162* NAVD 88 ORTHO HEIGHT -    54.307 (meters)      178.17  (feet) ADJUSTED
 HV2162  ______________________________________________________________________
 HV2162  GEOID HEIGHT    -        -32.002 (meters)                     GEOID18
 HV2162  LAPLACE CORR    -         -2.58  (seconds)                    DEFLEC18
 HV2162  DYNAMIC HEIGHT  -         54.278 (meters)      178.08  (feet) COMP
 HV2162  MODELED GRAVITY -    980,090.4   (mgal)                       NAVD 88
 HV2162
 HV2162  HORZ ORDER      -  SECOND
 HV2162  VERT ORDER      -  SECOND    CLASS 0
 HV2162
 HV2162.The horizontal coordinates were established by classical geodetic methods
 HV2162.and adjusted by the National Geodetic Survey in November 1994.
 HV2162
 HV2162.The orthometric height was determined by differential leveling and
 HV2162.adjusted by the NATIONAL GEODETIC SURVEY
 HV2162.in June 1991.
 HV2162
 HV2162.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2162.GEOID18 height accuracy estimate available here.
 HV2162
 HV2162.Click photographs - Photos may exist for this station.
 HV2162
 HV2162.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2162
 HV2162.The dynamic height is computed by dividing the NAVD 88
 HV2162.geopotential number by the normal gravity value computed on the
 HV2162.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2162.degrees latitude (g = 980.6199 gals.).
 HV2162
 HV2162.The modeled gravity was interpolated from observed gravity values.
 HV2162
 HV2162. The following values were computed from the NAD 83(1993) position.
 HV2162
 HV2162;                    North         East     Units Scale Factor Converg.
 HV2162;SPC MD       -   139,885.468   395,378.679   MT  0.99995024   -0 02 00.4
 HV2162;SPC MD       -   458,940.91  1,297,171.55   sFT  0.99995024   -0 02 00.4
 HV2162;SPC VA N     - 2,140,867.438 3,625,441.928   MT  0.99996292   +0 54 10.5
 HV2162;SPC VA N     - 7,023,829.25 11,894,470.73   sFT  0.99996292   +0 54 10.5
 HV2162;UTM  18      - 4,310,661.739   322,010.468   MT  0.99999011   -1 17 25.7
 HV2162
 HV2162!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2162!SPC MD       -   0.99999650  x   0.99995024  =   0.99994674
 HV2162!SPC VA N     -   0.99999650  x   0.99996292  =   0.99995942
 HV2162!UTM  18      -   0.99999650  x   0.99999011  =   0.99998661
 HV2162
 HV2162:                Primary Azimuth Mark                     Grid Az
 HV2162:SPC MD       -  NW 118 AZ MK                             336 06 07.0
 HV2162:SPC VA N     -  NW 118 AZ MK                             335 09 56.1
 HV2162:UTM  18      -  NW 118 AZ MK                             337 21 32.3
 HV2162
 HV2162_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2201010661(NAD 83)
 HV2162
 HV2162|---------------------------------------------------------------------|
 HV2162| PID    Reference Object                     Distance      Geod. Az  |
 HV2162|                                                           dddmmss.s |
 HV2162| HV4286 N W 118 A 1960                      379.646 METERS 15535     |
 HV2162| HV4335 N W 117 B 1960                      395.558 METERS 33550     |
 HV2162| DC6940 NW 118 AZ MK                                       3360406.6 |
 HV2162|---------------------------------------------------------------------|
 HV2162
 HV2162                          SUPERSEDED SURVEY CONTROL
 HV2162
 HV2162  NAD 83(1991)-  38 55 36.60218(N)    077 03 11.86522(W) AD(       ) 2
 HV2162  NAD 83(1986)-  38 55 36.60181(N)    077 03 11.87552(W) AD(       ) 2
 HV2162  NAD 27      -  38 55 36.20170(N)    077 03 12.95530(W) AD(       ) 2
 HV2162  NGVD 29              54.54   (m)          178.9    (f) LEVELING    3  
 HV2162  NGVD 29 (11/26/84)   54.535  (m)          178.92   (f) ADJUSTED    2 0
 HV2162
 HV2162.Superseded values are not recommended for survey control.
 HV2162
 HV2162.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2162.See file dsdata.pdf to determine how the superseded data were derived.
 HV2162
 HV2162_MARKER: DD = SURVEY DISK
 HV2162_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2162_SP_SET: MONUMENT
 HV2162_STAMPING: USCGS NO NW 118
 HV2162_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2162
 HV2162  HISTORY     - Date     Condition        Report By
 HV2162  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2162  HISTORY     - 1960     GOOD             MADHOP
 HV2162  HISTORY     - 1966     GOOD             LOCENG
 HV2162  HISTORY     - 1971     GOOD             NGS
 HV2162  HISTORY     - 20081204 MARK NOT FOUND   AMTHOM
 HV2162
 HV2162                          STATION DESCRIPTION
 HV2162
 HV2162'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2162'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2162'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO NW 118 SET IN
 HV2162'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2162'COVER WITH LID LABELED SURVEY.
 HV2162'
 HV2162'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2162'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NW 118-AZ. SET
 HV2162'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2162'COVER WITH LID LABELED SURVEY.
 HV2162'
 HV2162'NO GEOGRAPHIC POSITION
 HV2162
 HV2162                          STATION RECOVERY (1960)
 HV2162
 HV2162'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2162'IN WASHINGTON DC.
 HV2162'LOCATED ON CONNECTICUT AVE. N.W., NORTH OF THE Y INTERSECTION
 HV2162'OF GARFIELD ST. N.W.  IN FRONT OF BUILDING 2737 ON THE EAST SIDE
 HV2162'OF CONN. AVE. 23.25 FT NORTHWEST OF CROSS CUT IN RIM OF MANHOLE
 HV2162'LOCATED ON CONCRETE WALK PARALLEL TO CONN. AVE., AND 28.03
 HV2162'FT SOUTHEAST OF A CROSS CUT ON LAMP POST, AND 30.20 FT SOUTHWEST
 HV2162'OF THE SOUTHWEST CORNER OF BUILDING 2737.  A STANDARD BRASS
 HV2162'DISC SET IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A
 HV2162'STANDARD MANHOLE COVER WITH LID LABELED SURVEY.
 HV2162
 HV2162                          STATION RECOVERY (1966)
 HV2162
 HV2162'RECOVERY NOTE BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (CJM)
 HV2162'RECOVERED BY DE LEUW CATHER CO.
 HV2162'
 HV2162'NW 118 GOOD
 HV2162
 HV2162                          STATION RECOVERY (1971)
 HV2162
 HV2162'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2162'AZ MK WAS RECOVERED IN GOOD CONDITION AS PREVIOUSLY DESCRIBED,
 HV2162'EXCEPT THAT THE TREE WITH THE NAIL AND WASHER IN IT HAS BEEN
 HV2162'REMOVED.
 HV2162'
 HV2162'ADDITIONAL MEASUREMENTS FOLLOW--STATION IS 12.6 FEET EAST OF CURB
 HV2162'OF CONNECTICUT AVENUE, 1.4 FEET NORTH OF CURB OF HAWTHORNE STREET,
 HV2162'AND 38.7 FEET SOUTH-SOUTHEAST OF THE CENTER OF A MANHOLE COVER.
 HV2162'
 HV2162'STATION WAS RECOVERED IN GOOD CONDITION AS PREVIOUSLY DESCRIBED,
 HV2162'HOWEVER THE IRON MANHOLE COVER IS NOW CRACKED AND IS IN 2
 HV2162'PIECES.  ORIGINAL DESCRIPTION IS ADEQUATE.
 HV2162
 HV2162                          STATION RECOVERY (2008)
 HV2162
 HV2162'RECOVERY NOTE BY A MORTON THOMAS AND ASSOCIATES 2008 (JAN)
 HV2162'2737 CONN AVE NO LONGER EXISTS
 HV2162'NEW CONCRETE SIDEWALK IN PLACE
 HV2162'MANHOLE NO LONGER EXISTS
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2161 ***********************************************************************
 HV2161  DESIGNATION -  NW 119
 HV2161  PID         -  HV2161
 HV2161  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2161  COUNTRY     -  US
 HV2161  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2161
 HV2161                         *CURRENT SURVEY CONTROL
 HV2161  ______________________________________________________________________
 HV2161* NAD 83(1993) POSITION- 38 55 04.31677(N) 077 02 49.45330(W)   ADJUSTED
 HV2161* NAVD 88 ORTHO HEIGHT -    51.729 (meters)      169.71  (feet) ADJUSTED
 HV2161  ______________________________________________________________________
 HV2161  GEOID HEIGHT    -        -32.022 (meters)                     GEOID18
 HV2161  LAPLACE CORR    -         -2.20  (seconds)                    DEFLEC18
 HV2161  DYNAMIC HEIGHT  -         51.701 (meters)      169.62  (feet) COMP
 HV2161  MODELED GRAVITY -    980,093.9   (mgal)                       NAVD 88
 HV2161
 HV2161  HORZ ORDER      -  SECOND
 HV2161  VERT ORDER      -  SECOND    CLASS 0
 HV2161
 HV2161.The horizontal coordinates were established by classical geodetic methods
 HV2161.and adjusted by the National Geodetic Survey in November 1994.
 HV2161
 HV2161.The orthometric height was determined by differential leveling and
 HV2161.adjusted by the NATIONAL GEODETIC SURVEY
 HV2161.in June 1991.
 HV2161
 HV2161.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2161.GEOID18 height accuracy estimate available here.
 HV2161
 HV2161.Click photographs - Photos may exist for this station.
 HV2161
 HV2161.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2161
 HV2161.The dynamic height is computed by dividing the NAVD 88
 HV2161.geopotential number by the normal gravity value computed on the
 HV2161.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2161.degrees latitude (g = 980.6199 gals.).
 HV2161
 HV2161.The modeled gravity was interpolated from observed gravity values.
 HV2161
 HV2161. The following values were computed from the NAD 83(1993) position.
 HV2161
 HV2161;                    North         East     Units Scale Factor Converg.
 HV2161;SPC MD       -   138,889.601   395,917.958   MT  0.99995012   -0 01 46.4
 HV2161;SPC MD       -   455,673.63  1,298,940.83   sFT  0.99995012   -0 01 46.4
 HV2161;SPC VA N     - 2,139,880.504 3,625,997.416   MT  0.99996209   +0 54 24.5
 HV2161;SPC VA N     - 7,020,591.29 11,896,293.19   sFT  0.99996209   +0 54 24.5
 HV2161;UTM  18      - 4,309,654.243   322,527.793   MT  0.99998785   -1 17 10.7
 HV2161
 HV2161!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2161!SPC MD       -   0.99999691  x   0.99995012  =   0.99994703
 HV2161!SPC VA N     -   0.99999691  x   0.99996209  =   0.99995900
 HV2161!UTM  18      -   0.99999691  x   0.99998785  =   0.99998476
 HV2161
 HV2161:                Primary Azimuth Mark                     Grid Az
 HV2161:SPC MD       -  NW 119 AZ MK                             069 43 16.0
 HV2161:SPC VA N     -  NW 119 AZ MK                             068 47 05.1
 HV2161:UTM  18      -  NW 119 AZ MK                             070 58 40.3
 HV2161
 HV2161_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2252709654(NAD 83)
 HV2161
 HV2161|---------------------------------------------------------------------|
 HV2161| PID    Reference Object                     Distance      Geod. Az  |
 HV2161|                                                           dddmmss.s |
 HV2161| DC6941 NW 119 AZ MK                                       0694129.6 |
 HV2161| HV4257 CAFRITZ 1960                        342.889 METERS 16408     |
 HV2161| HV4214 N W 118 B 1960                      258.860 METERS 31326     |
 HV2161|---------------------------------------------------------------------|
 HV2161
 HV2161                          SUPERSEDED SURVEY CONTROL
 HV2161
 HV2161  NAD 83(1991)-  38 55 04.31578(N)    077 02 49.45463(W) AD(       ) 2
 HV2161  NAD 83(1986)-  38 55 04.31540(N)    077 02 49.46503(W) AD(       ) 2
 HV2161  NAD 27      -  38 55 03.91380(N)    077 02 50.54580(W) AD(       ) 2
 HV2161  NGVD 29              51.96   (m)          170.5    (f) LEVELING    3  
 HV2161  NGVD 29 (11/26/84)   51.956  (m)          170.46   (f) ADJUSTED    2 0
 HV2161
 HV2161.Superseded values are not recommended for survey control.
 HV2161
 HV2161.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2161.See file dsdata.pdf to determine how the superseded data were derived.
 HV2161
 HV2161_MARKER: DD = SURVEY DISK
 HV2161_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2161_SP_SET: MONUMENT
 HV2161_STAMPING: USCGS NO NW 119
 HV2161_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2161
 HV2161  HISTORY     - Date     Condition        Report By
 HV2161  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2161  HISTORY     - 1960     GOOD             MADHOP
 HV2161  HISTORY     - 1966     GOOD             LOCENG
 HV2161  HISTORY     - 1971     GOOD             NGS
 HV2161  HISTORY     - 20081204 MARK NOT FOUND   AMTHOM
 HV2161
 HV2161                          STATION DESCRIPTION
 HV2161
 HV2161'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2161'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2161'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NW 119 SET
 HV2161'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV2161'MANHOLE COVER WITH LID LABELED SURVEY.
 HV2161'
 HV2161'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2161'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NW119 -AZ. SET
 HV2161'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2161'COVER WITH LID LABELED SURVEY.
 HV2161'
 HV2161'NO GEOGRAPHIC POSITION
 HV2161
 HV2161                          STATION RECOVERY (1960)
 HV2161
 HV2161'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2161'IN WASHINGTON DC.
 HV2161'NEAR INTERSECTION OF CONNECTICUT AVE. N.W. AND WYOMING AVE.
 HV2161'N.W. ADJACENT TO BUILDING 2101 ON CONN. AVE.  39.00 FT SOUTHEAST
 HV2161'OF THE SOUTHWEST CORNER OF BUILDING 2101, AND 22.21 FT NORTHWEST
 HV2161'OF A NAIL AND WASHER IN A 6 IN ASH TREE ADJACENT TO WYOMING
 HV2161'AVE., AND 19.86 FT NORTHEAST OF A NAIL AND WASHER IN A 10 IN
 HV2161'ASH TREE ADJACENT TO WYOMING AVE., AND 33.23 FT NORTHEAST OF A
 HV2161'NAIL AND WASHER IN A 36 IN OAK TREE ADJACENT TO CONN. AVE.  A STANDARD
 HV2161'BRASS DISC SET IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED
 HV2161'BY A STANDARD MANHOLE COVER WITH LID LABELED SURVEY.
 HV2161
 HV2161                          STATION RECOVERY (1966)
 HV2161
 HV2161'RECOVERY NOTE BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (CJM)
 HV2161'RECOVERED BY DE LEUW CATHER CO.
 HV2161'
 HV2161'NW 119 AZ GOOD
 HV2161
 HV2161                          STATION RECOVERY (1971)
 HV2161
 HV2161'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2161'STATION WAS RECOVERED IN GOOD CONDITION.  THE NAILS AND
 HV2161'WASHERS IN THE 3 TREES CAN NO LONGER BE SEEN.  ADDITIONAL
 HV2161'INFORMATION TO AID IN RECOVERY IS AS FOLLOWS--STATION IS 10
 HV2161'INCHES NORTH OF EDGE OF SIDEWALK AND 20.0 FEET EAST OF EAST
 HV2161'EDGE OF SIDEWALK ALONG CONNECTICUT AVE.
 HV2161'
 HV2161'NW 119 AZ. WAS RECOVERED AS DESCRIBED.
 HV2161'
 HV2161'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2161'IN DISTRICT OF COLUMBIA.
 HV2161
 HV2161                          STATION RECOVERY (2008)
 HV2161
 HV2161'RECOVERY NOTE BY A MORTON THOMAS AND ASSOCIATES 2008 (JAN)
 HV2161'NEW CONCRETE SIDEWALK, CURB AND GRASS STRIP IN PLACE
 HV2161'NO SIGN OF MANHOLE OR DISK
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1886 ***********************************************************************
 HV1886  DESIGNATION -  NW 12
 HV1886  PID         -  HV1886
 HV1886  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1886  COUNTRY     -  US
 HV1886  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1886
 HV1886                         *CURRENT SURVEY CONTROL
 HV1886  ______________________________________________________________________
 HV1886* NAD 83(1986) POSITION- 38 55 17.3    (N) 077 02 07.3    (W)   HD_HELD2
 HV1886* NAVD 88 ORTHO HEIGHT -    59.65  (+/-2cm)      195.7   (feet) VERTCON3
 HV1886  ______________________________________________________________________
 HV1886  GEOID HEIGHT    -        -32.028 (meters)                     GEOID18
 HV1886  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1886
 HV1886.The horizontal coordinates were established by autonomous hand held GPS
 HV1886.observations and have an estimated accuracy of +/- 10 meters.
 HV1886
 HV1886.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1886.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1886
 HV1886.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1886.GEOID18 height accuracy estimate available here.
 HV1886
 HV1886.The vertical order pertains to the NGVD 29 superseded value.
 HV1886
 HV1886.Click photographs - Photos may exist for this station.
 HV1886
 HV1886
 HV1886_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2355110031(NAD 83)
 HV1886
 HV1886                          SUPERSEDED SURVEY CONTROL
 HV1886
 HV1886  NGVD 29 (11/26/84)   59.877  (m)          196.45   (f) ADJUSTED    1 2
 HV1886
 HV1886.Superseded values are not recommended for survey control.
 HV1886
 HV1886.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1886.See file dsdata.pdf to determine how the superseded data were derived.
 HV1886
 HV1886_MARKER: DD = SURVEY DISK
 HV1886_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1886_SP_SET: STEP
 HV1886_STAMPING: NW 12
 HV1886_MARK LOGO: PBPP
 HV1886_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1886_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1886+SATELLITE: SATELLITE OBSERVATIONS - November 12, 2011
 HV1886
 HV1886  HISTORY     - Date     Condition        Report By
 HV1886  HISTORY     - UNK      MONUMENTED       PBPP
 HV1886  HISTORY     - 1926     GOOD             PBPP
 HV1886  HISTORY     - 1943     GOOD             CGS
 HV1886  HISTORY     - 20020818 GOOD             INDIV
 HV1886  HISTORY     - 20111112 GOOD             NGS
 HV1886
 HV1886                          STATION DESCRIPTION
 HV1886
 HV1886'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1886'AT WASHINGTON.
 HV1886'AT WASHINGTON, AT THE INTERSECTION OF FIFTEENTH AND CHAPIN
 HV1886'STREETS NORTHWEST, AT THE ENTRANCE OT MERIDIAN HILL PARK, 50
 HV1886'FEET SOUTH OF THE CENTERLINE OF THE ENTRANCE, AT THE SOUTH END
 HV1886'OF THE SIDEWALK JUST INSIDE THE ORNAMENTAL CONCRETE WALL, AND
 HV1886'IN THE TOP OF THE EAST END OF THE LOWEST OF THREE STEPS.  A
 HV1886'PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED NW 12.
 HV1886'NOTE-- THE CORNER OF THE STEP IN WHICH THE DISK IS SET IS CRACKED
 HV1886'AND IS ABOUT 1/8 INCH HIGHER THAN THE REST OF THE STEP.
 HV1886
 HV1886                          STATION RECOVERY (1943)
 HV1886
 HV1886'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943
 HV1886'RECOVERED IN GOOD CONDITION.
 HV1886
 HV1886                          STATION RECOVERY (2002)
 HV1886
 HV1886'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 HV1886'ENTER PARK, ALSO KNOWN AS MALCOLM X PARK, AT 15TH AND CHAPIN STREETS,
 HV1886'AND IMMEDIATELY TURN LEFT. STATION IS IN SOUTHEAST CORNER OF LOWEST
 HV1886'STEP IN SMALL FLIGHT OF STAIRS.
 HV1886
 HV1886                          STATION RECOVERY (2011)
 HV1886
 HV1886'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2011 (DRD)
 HV1886'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2172 ***********************************************************************
 HV2172  DESIGNATION -  NW 121 DCDHT
 HV2172  PID         -  HV2172
 HV2172  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2172  COUNTRY     -  US
 HV2172  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2172
 HV2172                         *CURRENT SURVEY CONTROL
 HV2172  ______________________________________________________________________
 HV2172* NAD 83(1993) POSITION- 38 53 44.39219(N) 077 03 23.57073(W)   ADJUSTED
 HV2172* NAVD 88 ORTHO HEIGHT -     2.956 (meters)        9.70  (feet) ADJUSTED
 HV2172  ______________________________________________________________________
 HV2172  GEOID HEIGHT    -        -32.050 (meters)                     GEOID18
 HV2172  LAPLACE CORR    -         -2.50  (seconds)                    DEFLEC18
 HV2172  DYNAMIC HEIGHT  -          2.955 (meters)        9.69  (feet) COMP
 HV2172  MODELED GRAVITY -    980,094.5   (mgal)                       NAVD 88
 HV2172
 HV2172  HORZ ORDER      -  SECOND
 HV2172  VERT ORDER      -  SECOND    CLASS 0
 HV2172
 HV2172.The horizontal coordinates were established by classical geodetic methods
 HV2172.and adjusted by the National Geodetic Survey in November 1994.
 HV2172
 HV2172.The orthometric height was determined by differential leveling and
 HV2172.adjusted by the NATIONAL GEODETIC SURVEY
 HV2172.in June 1991.
 HV2172
 HV2172.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2172.GEOID18 height accuracy estimate available here.
 HV2172
 HV2172.Click photographs - Photos may exist for this station.
 HV2172
 HV2172.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2172
 HV2172.The dynamic height is computed by dividing the NAVD 88
 HV2172.geopotential number by the normal gravity value computed on the
 HV2172.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2172.degrees latitude (g = 980.6199 gals.).
 HV2172
 HV2172.The modeled gravity was interpolated from observed gravity values.
 HV2172
 HV2172. The following values were computed from the NAD 83(1993) position.
 HV2172
 HV2172;                    North         East     Units Scale Factor Converg.
 HV2172;SPC MD       -   136,425.545   395,094.560   MT  0.99994991   -0 02 07.8
 HV2172;SPC MD       -   447,589.48  1,296,239.40   sFT  0.99994991   -0 02 07.8
 HV2172;SPC VA N     - 2,137,403.295 3,625,214.387   MT  0.99996014   +0 54 03.2
 HV2172;SPC VA N     - 7,012,463.98 11,893,724.20   sFT  0.99996014   +0 54 03.2
 HV2172;UTM  18      - 4,307,208.738   321,650.527   MT  0.99999170   -1 17 30.0
 HV2172
 HV2172!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2172!SPC MD       -   1.00000456  x   0.99994991  =   0.99995447
 HV2172!SPC VA N     -   1.00000456  x   0.99996014  =   0.99996470
 HV2172!UTM  18      -   1.00000456  x   0.99999170  =   0.99999626
 HV2172
 HV2172:                Primary Azimuth Mark                     Grid Az
 HV2172:SPC MD       -  NW 111 DCDHT                             319 00 56.5
 HV2172:SPC VA N     -  NW 111 DCDHT                             318 04 45.5
 HV2172:UTM  18      -  NW 111 DCDHT                             320 16 18.7
 HV2172
 HV2172_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2165007208(NAD 83)
 HV2172
 HV2172|---------------------------------------------------------------------|
 HV2172| PID    Reference Object                     Distance      Geod. Az  |
 HV2172|                                                           dddmmss.s |
 HV2172| HV4326 CRANFORD                             20.732 METERS 00006     |
 HV2172| HV2164 NW 111 DCDHT                        APPROX. 1.0 KM 3185848.7 |
 HV2172|---------------------------------------------------------------------|
 HV2172
 HV2172                          SUPERSEDED SURVEY CONTROL
 HV2172
 HV2172  NAD 83(1991)-  38 53 44.39097(N)    077 03 23.57227(W) AD(       ) 2
 HV2172  NAD 83(1986)-  38 53 44.39066(N)    077 03 23.58279(W) AD(       ) 2
 HV2172  NAD 27      -  38 53 43.98860(N)    077 03 24.65870(W) AD(       ) 2
 HV2172  NGVD 29               3.19   (m)           10.5    (f) LEVELING    3  
 HV2172  NGVD 29 (11/26/84)    3.192  (m)           10.47   (f) ADJUSTED    2 0
 HV2172
 HV2172.Superseded values are not recommended for survey control.
 HV2172
 HV2172.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2172.See file dsdata.pdf to determine how the superseded data were derived.
 HV2172
 HV2172_MARKER: DD = SURVEY DISK
 HV2172_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2172_SP_SET: MONUMENT
 HV2172_STAMPING: USCGS NO NW 121
 HV2172_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2172
 HV2172  HISTORY     - Date     Condition        Report By
 HV2172  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2172  HISTORY     - 1960     GOOD             MADHOP
 HV2172
 HV2172                          STATION DESCRIPTION
 HV2172
 HV2172'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2172'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2172'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO NW 121 SET IN
 HV2172'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2172'COVER WITH LID LABELED SURVEY.
 HV2172
 HV2172                          STATION RECOVERY (1960)
 HV2172
 HV2172'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2172'IN WASHINGTON DC.
 HV2172'LOCATED NEAR POTOMAC PARKWAY AT INTERSECTIONS OF POTOMAC PKWY,
 HV2172'E ST. N.W., AND NEW HAMPSHIRE AVE. N.W. ADJACENT TO TITANIC
 HV2172'MEMORIAL 107.52 FT. SOUTHEAST OF THE SOUTHEAST CORNER OF
 HV2172'MEMORIAL, AND 58.80 FT. SOUTHWEST OF CROSS CUT IN RIM OF
 HV2172'MANHOLE ADJACENT TO PARKWAY, AND 42.45 FT. NORTHEAST OF A
 HV2172'RAMSET NAIL IN TOP OF SEA WALL.  A STANDARD BRASS DISC SET IN TOP
 HV2172'OF A 12 IN. CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2172'COVER WITH LID LABELED SURVEY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2159 ***********************************************************************
 HV2159  DESIGNATION -  NW 122 DCDHT RESET
 HV2159  PID         -  HV2159
 HV2159  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2159  COUNTRY     -  US
 HV2159  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2159
 HV2159                         *CURRENT SURVEY CONTROL
 HV2159  ______________________________________________________________________
 HV2159* NAD 83(1993) POSITION- 38 55 02.15138(N) 077 02 10.99044(W)   ADJUSTED
 HV2159* NAVD 88 ORTHO HEIGHT -    29.74  (meters)       97.6   (feet) RESET
 HV2159  ______________________________________________________________________
 HV2159  GEOID HEIGHT    -        -32.034 (meters)                     GEOID18
 HV2159  LAPLACE CORR    -         -2.08  (seconds)                    DEFLEC18
 HV2159  HORZ ORDER      -  SECOND
 HV2159  VERT ORDER      -  THIRD
 HV2159
 HV2159.The horizontal coordinates were established by classical geodetic methods
 HV2159.and adjusted by the National Geodetic Survey in November 1994.
 HV2159
 HV2159.The orthometric height was computed from unverified reset data.
 HV2159
 HV2159.No vertical observational check was made to the station.
 HV2159
 HV2159.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2159.GEOID18 height accuracy estimate available here.
 HV2159
 HV2159.Click photographs - Photos may exist for this station.
 HV2159
 HV2159.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2159
 HV2159. The following values were computed from the NAD 83(1993) position.
 HV2159
 HV2159;                    North         East     Units Scale Factor Converg.
 HV2159;SPC MD       -   138,822.406   396,844.481   MT  0.99995011   -0 01 22.2
 HV2159;SPC MD       -   455,453.18  1,301,980.60   sFT  0.99995011   -0 01 22.2
 HV2159;SPC VA N     - 2,139,828.458 3,626,924.925   MT  0.99996204   +0 54 48.5
 HV2159;SPC VA N     - 7,020,420.53 11,899,336.19   sFT  0.99996204   +0 54 48.5
 HV2159;UTM  18      - 4,309,566.740   323,452.653   MT  0.99998382   -1 16 46.5
 HV2159
 HV2159!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2159!SPC MD       -   1.00000036  x   0.99995011  =   0.99995047
 HV2159!SPC VA N     -   1.00000036  x   0.99996204  =   0.99996240
 HV2159!UTM  18      -   1.00000036  x   0.99998382  =   0.99998418
 HV2159
 HV2159:                Primary Azimuth Mark                     Grid Az
 HV2159:SPC MD       -  N W 119 A 1960                           215 49 51.8
 HV2159:SPC VA N     -  N W 119 A 1960                           214 53 41.1
 HV2159:UTM  18      -  N W 119 A 1960                           217 05 16.1
 HV2159
 HV2159_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2345209566(NAD 83)
 HV2159
 HV2159|---------------------------------------------------------------------|
 HV2159| PID    Reference Object                     Distance      Geod. Az  |
 HV2159|                                                           dddmmss.s |
 HV2159| HV4356 N W 122 A 1960                      APPROX. 0.6 KM 0000255.5 |
 HV2159| HV4258 N W 119 A 1960                      APPROX. 1.0 KM 2154829.6 |
 HV2159|---------------------------------------------------------------------|
 HV2159
 HV2159                          SUPERSEDED SURVEY CONTROL
 HV2159
 HV2159  NAD 83(1991)-  38 55 02.15034(N)    077 02 10.99174(W) AD(       ) 2
 HV2159  NAD 83(1986)-  38 55 02.14932(N)    077 02 11.00227(W) AD(       ) 2
 HV2159  NAD 27      -  38 55 01.74850(N)    077 02 12.08510(W) AD(       ) 2
 HV2159  NGVD 29 (??/??/??)   29.97   (m)           98.3    (f) RESET       3  
 HV2159  NGVD 29              29.97   (m)           98.3    (f) LEVELING    3  
 HV2159
 HV2159.Superseded values are not recommended for survey control.
 HV2159
 HV2159.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2159.See file dsdata.pdf to determine how the superseded data were derived.
 HV2159
 HV2159_MARKER: DD = SURVEY DISK
 HV2159_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2159_SP_SET: MONUMENT
 HV2159_STAMPING: USCGS NO NW 122 RESET
 HV2159_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2159
 HV2159  HISTORY     - Date     Condition        Report By
 HV2159  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2159  HISTORY     - 1961     GOOD             MADHOP
 HV2159  HISTORY     - 1971     GOOD             NGS
 HV2159
 HV2159                          STATION DESCRIPTION
 HV2159
 HV2159'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2159'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2159'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NW 122 RESET IN
 HV2159'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2159'COVER WITH LID LABELED SURVEY.
 HV2159
 HV2159                          STATION RECOVERY (1961)
 HV2159
 HV2159'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1961
 HV2159'IN WASHINGTON DC.
 HV2159'LOCATED IN THE INTERSECTION OF NEW HAMPSHIRE AVE. N.W. AND 16TH
 HV2159'ST. N.W. 15.59 FT WEST OF CROSS CUT IN MANHOLE RIM LOCATED IN
 HV2159'THE ROADWAY OF NEW HAMPSHIRE AVE. N.W., AND 3.36 FT NORTHEAST
 HV2159'OF X CUT IN MAN HOLE RIM LOCATED IN THE ROADWAY OF INTERSECTION.
 HV2159'A STANDARD BRASS DISC SET IN TOP OF 12 IN CONCRETE MONUMENT
 HV2159'SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID LABELED SURVEY.
 HV2159
 HV2159                          STATION RECOVERY (1971)
 HV2159
 HV2159'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2159'STATION AND REFERENCE POINTS RECOVERED AND FOUND TO BE IN GOOD
 HV2159'CONDITION.  STATION IS ALSO 7.9 FEET SOUTH OF CURB FACE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2140 ***********************************************************************
 HV2140  DESIGNATION -  NW 124
 HV2140  PID         -  HV2140
 HV2140  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2140  COUNTRY     -  US
 HV2140  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2140
 HV2140                         *CURRENT SURVEY CONTROL
 HV2140  ______________________________________________________________________
 HV2140* NAD 83(1993) POSITION- 38 56 38.66978(N) 077 02 10.63175(W)   ADJUSTED
 HV2140* NAVD 88 ORTHO HEIGHT -    61.172 (meters)      200.70  (feet) ADJUSTED
 HV2140  ______________________________________________________________________
 HV2140  GEOID HEIGHT    -        -32.000 (meters)                     GEOID18
 HV2140  LAPLACE CORR    -         -1.96  (seconds)                    DEFLEC18
 HV2140  DYNAMIC HEIGHT  -         61.139 (meters)      200.59  (feet) COMP
 HV2140  MODELED GRAVITY -    980,093.7   (mgal)                       NAVD 88
 HV2140
 HV2140  HORZ ORDER      -  SECOND
 HV2140  VERT ORDER      -  SECOND    CLASS 0
 HV2140
 HV2140.The horizontal coordinates were established by classical geodetic methods
 HV2140.and adjusted by the National Geodetic Survey in November 1994.
 HV2140
 HV2140.The orthometric height was determined by differential leveling and
 HV2140.adjusted by the NATIONAL GEODETIC SURVEY
 HV2140.in June 1991.
 HV2140
 HV2140.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2140.GEOID18 height accuracy estimate available here.
 HV2140
 HV2140.Click photographs - Photos may exist for this station.
 HV2140
 HV2140.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2140
 HV2140.The dynamic height is computed by dividing the NAVD 88
 HV2140.geopotential number by the normal gravity value computed on the
 HV2140.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2140.degrees latitude (g = 980.6199 gals.).
 HV2140
 HV2140.The modeled gravity was interpolated from observed gravity values.
 HV2140
 HV2140. The following values were computed from the NAD 83(1993) position.
 HV2140
 HV2140;                    North         East     Units Scale Factor Converg.
 HV2140;SPC MD       -   141,798.618   396,854.305   MT  0.99995056   -0 01 22.0
 HV2140;SPC MD       -   465,217.63  1,302,012.83   sFT  0.99995056   -0 01 22.0
 HV2140;SPC VA N     - 2,142,804.472 3,626,886.113   MT  0.99996459   +0 54 48.7
 HV2140;SPC VA N     - 7,030,184.34 11,899,208.86   sFT  0.99996459   +0 54 48.7
 HV2140;UTM  18      - 4,312,542.119   323,527.772   MT  0.99998349   -1 16 48.9
 HV2140
 HV2140!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2140!SPC MD       -   0.99999542  x   0.99995056  =   0.99994598
 HV2140!SPC VA N     -   0.99999542  x   0.99996459  =   0.99996001
 HV2140!UTM  18      -   0.99999542  x   0.99998349  =   0.99997891
 HV2140
 HV2140:                Primary Azimuth Mark                     Grid Az
 HV2140:SPC MD       -  NW 124 AZ MK                             181 56 08.7
 HV2140:SPC VA N     -  NW 124 AZ MK                             180 59 58.0
 HV2140:UTM  18      -  NW 124 AZ MK                             183 11 35.6
 HV2140
 HV2140_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2352712542(NAD 83)
 HV2140
 HV2140|---------------------------------------------------------------------|
 HV2140| PID    Reference Object                     Distance      Geod. Az  |
 HV2140|                                                           dddmmss.s |
 HV2140| HV4340 N W 123 C 1960                      348.344 METERS 18027     |
 HV2140| DC6943 NW 124 AZ MK                                       1815446.7 |
 HV2140| HV4332 N W 124 A 1960                      333.285 METERS 35936     |
 HV2140|---------------------------------------------------------------------|
 HV2140
 HV2140                          SUPERSEDED SURVEY CONTROL
 HV2140
 HV2140  NAD 83(1991)-  38 56 38.66878(N)    077 02 10.63290(W) AD(       ) 2
 HV2140  NAD 83(1986)-  38 56 38.66834(N)    077 02 10.64287(W) AD(       ) 2
 HV2140  NAD 27      -  38 56 38.27050(N)    077 02 11.72180(W) AD(       ) 2
 HV2140  NGVD 29              61.40   (m)          201.4    (f) LEVELING    3  
 HV2140  NGVD 29 (11/26/84)   61.403  (m)          201.45   (f) ADJUSTED    2 0
 HV2140
 HV2140.Superseded values are not recommended for survey control.
 HV2140
 HV2140.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2140.See file dsdata.pdf to determine how the superseded data were derived.
 HV2140
 HV2140_MARKER: DD = SURVEY DISK
 HV2140_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2140_SP_SET: MONUMENT
 HV2140_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2140
 HV2140  HISTORY     - Date     Condition        Report By
 HV2140  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2140  HISTORY     - 1960     GOOD             MADHOP
 HV2140  HISTORY     - 1971     GOOD             NGS
 HV2140
 HV2140                          STATION DESCRIPTION
 HV2140
 HV2140'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2140'STATION IS A STANDARD BRASS DISC SET IN TOP OF 12 IN CONCRETE
 HV2140'MONUMENT STAMPED DISTRICT OF COLUMBIA DEPARTMENT OF HIGHWAYS AND
 HV2140'TRAFFIC USC AND GS NO NW 124 SURMOUNTED BY A STANDARD MANHOLE
 HV2140'COVER WITH LID LABELED SURVEY.
 HV2140'
 HV2140'NW 124-F IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2140'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS N.W. 124-F GROUTED
 HV2140'IN CONCRETE WALK.  THIS IS AZIMUTH MARK FOR STATION NW 124.  NO
 HV2140'POSITION DETERMINED.
 HV2140'
 HV2140'NO GEOGRAPHIC POSITION
 HV2140
 HV2140                          STATION RECOVERY (1960)
 HV2140
 HV2140'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2140'IN WASHINGTON DC.
 HV2140'AT THE INTERSECTION OF 16TH ST. N.W. AND WEBSTER ST. N.W., BESIDE
 HV2140'THE FIRST CHURCH OF THE NAZERENE.  12.47 FT NORTH OF A RAMSET NAIL
 HV2140'IN THE TOP OF WEBSTER ST. CURB IN THE NORTHEAST CORNER OF THE
 HV2140'INTERSECTION, AND 15.12 FT EAST OF A RAMSET NAIL IN THE TOP OF
 HV2140'16TH ST. CURB IN THE NORTH EAST CORNER OF THE INTERSECTION, AND
 HV2140'3.05 FT NORTHEAST OF A CROSS CUT IN THE RIM OF A MAN HOLE IN THE
 HV2140'NORTHEAST CORNER OF THE INTERSECTION.  A 12 IN CONCRETE MONUMENT
 HV2140'6 IN BELOW SURFACE WITH GRATE COVER MARKED SURVEY.
 HV2140
 HV2140                          STATION RECOVERY (1971)
 HV2140
 HV2140'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2140'STATION AND REFERENCE POINTS RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2139 ***********************************************************************
 HV2139  DESIGNATION -  NW 124 B MADHOP
 HV2139  PID         -  HV2139
 HV2139  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2139  COUNTRY     -  US
 HV2139  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2139
 HV2139                         *CURRENT SURVEY CONTROL
 HV2139  ______________________________________________________________________
 HV2139* NAD 83(1993) POSITION- 38 56 58.50325(N) 077 02 10.70931(W)   ADJUSTED
 HV2139* NAVD 88 ORTHO HEIGHT -    72.405 (meters)      237.55  (feet) ADJUSTED
 HV2139  ______________________________________________________________________
 HV2139  GEOID HEIGHT    -        -31.995 (meters)                     GEOID18
 HV2139  LAPLACE CORR    -         -2.11  (seconds)                    DEFLEC18
 HV2139  DYNAMIC HEIGHT  -         72.366 (meters)      237.42  (feet) COMP
 HV2139  MODELED GRAVITY -    980,092.8   (mgal)                       NAVD 88
 HV2139
 HV2139  HORZ ORDER      -  SECOND
 HV2139  VERT ORDER      -  SECOND    CLASS 0
 HV2139
 HV2139.The horizontal coordinates were established by classical geodetic methods
 HV2139.and adjusted by the National Geodetic Survey in November 1994.
 HV2139
 HV2139.The orthometric height was determined by differential leveling and
 HV2139.adjusted by the NATIONAL GEODETIC SURVEY
 HV2139.in June 1991.
 HV2139
 HV2139.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2139.GEOID18 height accuracy estimate available here.
 HV2139
 HV2139.Click photographs - Photos may exist for this station.
 HV2139
 HV2139.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2139
 HV2139.The dynamic height is computed by dividing the NAVD 88
 HV2139.geopotential number by the normal gravity value computed on the
 HV2139.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2139.degrees latitude (g = 980.6199 gals.).
 HV2139
 HV2139.The modeled gravity was interpolated from observed gravity values.
 HV2139
 HV2139. The following values were computed from the NAD 83(1993) position.
 HV2139
 HV2139;                    North         East     Units Scale Factor Converg.
 HV2139;SPC MD       -   142,410.200   396,852.681   MT  0.99995067   -0 01 22.0
 HV2139;SPC MD       -   467,224.13  1,302,007.50   sFT  0.99995067   -0 01 22.0
 HV2139;SPC VA N     - 2,143,415.955 3,626,874.495   MT  0.99996514   +0 54 48.7
 HV2139;SPC VA N     - 7,032,190.51 11,899,170.74   sFT  0.99996514   +0 54 48.7
 HV2139;UTM  18      - 4,313,153.610   323,539.571   MT  0.99998344   -1 16 49.5
 HV2139
 HV2139!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2139!SPC MD       -   0.99999366  x   0.99995067  =   0.99994433
 HV2139!SPC VA N     -   0.99999366  x   0.99996514  =   0.99995880
 HV2139!UTM  18      -   0.99999366  x   0.99998344  =   0.99997710
 HV2139
 HV2139_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2353913153(NAD 83)
 HV2139
 HV2139                          SUPERSEDED SURVEY CONTROL
 HV2139
 HV2139  NAD 83(1991)-  38 56 58.50227(N)    077 02 10.71042(W) AD(       ) 2
 HV2139  NAD 83(1986)-  38 56 58.50183(N)    077 02 10.72032(W) AD(       ) 2
 HV2139  NAD 27      -  38 56 58.10530(N)    077 02 11.79800(W) AD(       ) 2
 HV2139  NGVD 29              72.64   (m)          238.3    (f) LEVELING    3  
 HV2139  NGVD 29 (11/26/84)   72.635  (m)          238.30   (f) ADJUSTED    2 0
 HV2139
 HV2139.Superseded values are not recommended for survey control.
 HV2139
 HV2139.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2139.See file dsdata.pdf to determine how the superseded data were derived.
 HV2139
 HV2139_MARKER: Z = SEE DESCRIPTION
 HV2139_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2139_SP_SET: SIDEWALK
 HV2139_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2139
 HV2139  HISTORY     - Date     Condition        Report By
 HV2139  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2139  HISTORY     - 1960     GOOD             MADHOP
 HV2139  HISTORY     - 1971     GOOD             NGS
 HV2139
 HV2139                          STATION DESCRIPTION
 HV2139
 HV2139'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2139'IN WASHINGTON DC.
 HV2139'NEAR THE INTERSECTION OF 16TH ST. N.W. AND EMERSON ST. N.W. IN
 HV2139'FRONT OF BUILDING 4831.  12.39 FT NORTHEAST OF A 12 IN ASH TREE
 HV2139'BESIDE 16TH ST., AND 30.55 FT SOUTHWEST OF THE NORTHWEST CORNER
 HV2139'OF THE RETAINING WALL SURROUNDING BUILDING 4831, AND 5.71 FT
 HV2139'EAST OF THE CURB FACE ON 16TH ST.  A PIPE AND SCREW ON WEST EDGE
 HV2139'OF WALK.
 HV2139
 HV2139                          STATION RECOVERY (1971)
 HV2139
 HV2139'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2139'STATION AND REFERENCE POINTS RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2138 ***********************************************************************
 HV2138  DESIGNATION -  NW 124 E MADHOP
 HV2138  PID         -  HV2138
 HV2138  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2138  COUNTRY     -  US
 HV2138  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2138
 HV2138                         *CURRENT SURVEY CONTROL
 HV2138  ______________________________________________________________________
 HV2138* NAD 83(1993) POSITION- 38 57 27.95185(N) 077 02 10.60068(W)   ADJUSTED
 HV2138* NAVD 88 ORTHO HEIGHT -    81.601 (meters)      267.72  (feet) ADJUSTED
 HV2138  ______________________________________________________________________
 HV2138  GEOID HEIGHT    -        -31.987 (meters)                     GEOID18
 HV2138  LAPLACE CORR    -         -2.35  (seconds)                    DEFLEC18
 HV2138  DYNAMIC HEIGHT  -         81.557 (meters)      267.57  (feet) COMP
 HV2138  MODELED GRAVITY -    980,091.5   (mgal)                       NAVD 88
 HV2138
 HV2138  HORZ ORDER      -  SECOND
 HV2138  VERT ORDER      -  SECOND    CLASS 0
 HV2138
 HV2138.The horizontal coordinates were established by classical geodetic methods
 HV2138.and adjusted by the National Geodetic Survey in November 1994.
 HV2138
 HV2138.The orthometric height was determined by differential leveling and
 HV2138.adjusted by the NATIONAL GEODETIC SURVEY
 HV2138.in June 1991.
 HV2138
 HV2138.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2138.GEOID18 height accuracy estimate available here.
 HV2138
 HV2138.Click photographs - Photos may exist for this station.
 HV2138
 HV2138.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2138
 HV2138.The dynamic height is computed by dividing the NAVD 88
 HV2138.geopotential number by the normal gravity value computed on the
 HV2138.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2138.degrees latitude (g = 980.6199 gals.).
 HV2138
 HV2138.The modeled gravity was interpolated from observed gravity values.
 HV2138
 HV2138. The following values were computed from the NAD 83(1993) position.
 HV2138
 HV2138;                    North         East     Units Scale Factor Converg.
 HV2138;SPC MD       -   143,318.272   396,855.657   MT  0.99995087   -0 01 22.0
 HV2138;SPC MD       -   470,203.36  1,302,017.27   sFT  0.99995087   -0 01 22.0
 HV2138;SPC VA N     - 2,144,323.968 3,626,862.632   MT  0.99996598   +0 54 48.7
 HV2138;SPC VA N     - 7,035,169.55 11,899,131.82   sFT  0.99996598   +0 54 48.7
 HV2138;UTM  18      - 4,314,061.427   323,562.480   MT  0.99998334   -1 16 50.3
 HV2138
 HV2138!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2138!SPC MD       -   0.99999222  x   0.99995087  =   0.99994309
 HV2138!SPC VA N     -   0.99999222  x   0.99996598  =   0.99995820
 HV2138!UTM  18      -   0.99999222  x   0.99998334  =   0.99997556
 HV2138
 HV2138:                Primary Azimuth Mark                     Grid Az
 HV2138:SPC MD       -  NW 125                                   000 23 30.3
 HV2138:SPC VA N     -  NW 125                                   359 27 19.6
 HV2138:UTM  18      -  NW 125                                   001 38 58.6
 HV2138
 HV2138_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2356214061(NAD 83)
 HV2138
 HV2138|---------------------------------------------------------------------|
 HV2138| PID    Reference Object                     Distance      Geod. Az  |
 HV2138|                                                           dddmmss.s |
 HV2138| HV2127 NW 125                              426.985 METERS 0002208.3 |
 HV2138| HV4329 N W 124 D 1960                      325.282 METERS 18016     |
 HV2138|---------------------------------------------------------------------|
 HV2138
 HV2138                          SUPERSEDED SURVEY CONTROL
 HV2138
 HV2138  NAD 83(1991)-  38 57 27.95090(N)    077 02 10.60170(W) AD(       ) 2
 HV2138  NAD 83(1986)-  38 57 27.95045(N)    077 02 10.61154(W) AD(       ) 2
 HV2138  NAD 27      -  38 57 27.55580(N)    077 02 11.68700(W) AD(       ) 2
 HV2138  NGVD 29              81.83   (m)          268.5    (f) LEVELING    3  
 HV2138  NGVD 29 (11/26/84)   81.831  (m)          268.47   (f) ADJUSTED    2 0
 HV2138
 HV2138.Superseded values are not recommended for survey control.
 HV2138
 HV2138.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2138.See file dsdata.pdf to determine how the superseded data were derived.
 HV2138
 HV2138_MARKER: Z = SEE DESCRIPTION
 HV2138_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2138_SP_SET: SIDEWALK
 HV2138_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2138
 HV2138  HISTORY     - Date     Condition        Report By
 HV2138  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2138  HISTORY     - 1960     GOOD             MADHOP
 HV2138  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV2138
 HV2138                          STATION DESCRIPTION
 HV2138
 HV2138'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2138'IN WASHINGTON DC.
 HV2138'NORTH OF LONGFELLOW ST. ON 16TH ST. N.W. IN FRONT OF BUILDING
 HV2138'5605, 12.30 FT NORTHEAST OF A NAIL AND WASHER IN A 10 IN ASH TREE
 HV2138'NEXT TO THE CURB OF 16TH ST., AND 11.81 FT SOUTHWEST OF THE
 HV2138'NORTHWEST CORNER OF A SMALL PILLAR ON NORTH SIDE OF THE NORTHWEST
 HV2138'CORNER OF A SMALL PILLAR ON NORTH SIDE OF WALK IN FRONT OF
 HV2138'BUILDING 5605., AND 8.98 FT EAST OF THE CURB FACE.  A PIPE AND
 HV2138'SCREW AT CORNER OF WALKS.
 HV2138
 HV2138                          STATION RECOVERY (1971)
 HV2138
 HV2138'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2138'STATION WAS LOST WHEN THE SIDEWALK WAS REPLACED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2127 ***********************************************************************
 HV2127  DESIGNATION -  NW 125
 HV2127  PID         -  HV2127
 HV2127  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2127  COUNTRY     -  US
 HV2127  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2127
 HV2127                         *CURRENT SURVEY CONTROL
 HV2127  ______________________________________________________________________
 HV2127* NAD 83(1993) POSITION- 38 57 41.79790(N) 077 02 10.48647(W)   ADJUSTED
 HV2127* NAVD 88 ORTHO HEIGHT -    76.796 (meters)      251.95  (feet) ADJUSTED
 HV2127  ______________________________________________________________________
 HV2127  GEOID HEIGHT    -        -31.984 (meters)                     GEOID18
 HV2127  LAPLACE CORR    -         -2.43  (seconds)                    DEFLEC18
 HV2127  DYNAMIC HEIGHT  -         76.755 (meters)      251.82  (feet) COMP
 HV2127  MODELED GRAVITY -    980,090.9   (mgal)                       NAVD 88
 HV2127
 HV2127  HORZ ORDER      -  SECOND
 HV2127  VERT ORDER      -  SECOND    CLASS 0
 HV2127
 HV2127.The horizontal coordinates were established by classical geodetic methods
 HV2127.and adjusted by the National Geodetic Survey in November 1994.
 HV2127
 HV2127.The orthometric height was determined by differential leveling and
 HV2127.adjusted by the NATIONAL GEODETIC SURVEY
 HV2127.in June 1991.
 HV2127
 HV2127.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2127.GEOID18 height accuracy estimate available here.
 HV2127
 HV2127.Click photographs - Photos may exist for this station.
 HV2127
 HV2127.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2127
 HV2127.The dynamic height is computed by dividing the NAVD 88
 HV2127.geopotential number by the normal gravity value computed on the
 HV2127.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2127.degrees latitude (g = 980.6199 gals.).
 HV2127
 HV2127.The modeled gravity was interpolated from observed gravity values.
 HV2127
 HV2127. The following values were computed from the NAD 83(1993) position.
 HV2127
 HV2127;                    North         East     Units Scale Factor Converg.
 HV2127;SPC MD       -   143,745.227   396,858.577   MT  0.99995097   -0 01 21.9
 HV2127;SPC MD       -   471,604.13  1,302,026.85   sFT  0.99995097   -0 01 21.9
 HV2127;SPC VA N     - 2,144,750.919 3,626,858.574   MT  0.99996638   +0 54 48.8
 HV2127;SPC VA N     - 7,036,570.31 11,899,118.50   sFT  0.99996638   +0 54 48.8
 HV2127;UTM  18      - 4,314,488.229   323,574.772   MT  0.99998328   -1 16 50.6
 HV2127
 HV2127!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2127!SPC MD       -   0.99999297  x   0.99995097  =   0.99994394
 HV2127!SPC VA N     -   0.99999297  x   0.99996638  =   0.99995935
 HV2127!UTM  18      -   0.99999297  x   0.99998328  =   0.99997625
 HV2127
 HV2127:                Primary Azimuth Mark                     Grid Az
 HV2127:SPC MD       -  NW 124 E MADHOP                          180 23 30.3
 HV2127:SPC VA N     -  NW 124 E MADHOP                          179 27 19.6
 HV2127:UTM  18      -  NW 124 E MADHOP                          181 38 59.0
 HV2127
 HV2127_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2357414488(NAD 83)
 HV2127
 HV2127|---------------------------------------------------------------------|
 HV2127| PID    Reference Object                     Distance      Geod. Az  |
 HV2127|                                                           dddmmss.s |
 HV2127| HV2126 NW 125 A DCDHT                      436.176 METERS 0000209.4 |
 HV2127| HV2138 NW 124 E MADHOP                     426.985 METERS 1802208.4 |
 HV2127| DC6944 NW 125 AZ MK                                       1804236.3 |
 HV2127|---------------------------------------------------------------------|
 HV2127
 HV2127                          SUPERSEDED SURVEY CONTROL
 HV2127
 HV2127  NAD 83(1991)-  38 57 41.79696(N)    077 02 10.48746(W) AD(       ) 2
 HV2127  NAD 83(1986)-  38 57 41.79651(N)    077 02 10.49727(W) AD(       ) 2
 HV2127  NAD 27      -  38 57 41.40250(N)    077 02 11.57150(W) AD(       ) 2
 HV2127  NGVD 29              77.03   (m)          252.7    (f) LEVELING    3  
 HV2127  NGVD 29 (11/26/84)   77.026  (m)          252.71   (f) ADJUSTED    2 0
 HV2127
 HV2127.Superseded values are not recommended for survey control.
 HV2127
 HV2127.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2127.See file dsdata.pdf to determine how the superseded data were derived.
 HV2127
 HV2127_MARKER: DD = SURVEY DISK
 HV2127_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2127_SP_SET: MONUMENT
 HV2127_STAMPING: USCGS NO NW 125
 HV2127_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2127
 HV2127  HISTORY     - Date     Condition        Report By
 HV2127  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2127  HISTORY     - 1960     GOOD             MADHOP
 HV2127  HISTORY     - 1971     GOOD             NGS
 HV2127
 HV2127                          STATION DESCRIPTION
 HV2127
 HV2127'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2127'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2127'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO NW 125 SET IN
 HV2127'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2127'COVER WITH LID LABELED SURVEY.
 HV2127'
 HV2127'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2127'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NW 125-AZ. SET
 HV2127'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2127'COVER WITH LID LABELED SURVEY.
 HV2127'
 HV2127'NO GEOGRAPHIC POSITION
 HV2127
 HV2127                          STATION RECOVERY (1960)
 HV2127
 HV2127'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2127'IN WASHINGTON DC.
 HV2127'AT THE CORNER OF 16TH ST. N.W. AND OGLETHORPE ST. 15.92 FT NORTHWEST
 HV2127'OF A NAIL AND WASHER IN A 12 IN MAPLE TREE ON OGLETHORPE ST.,
 HV2127'AND 11.53 FT NORTHEAST OF A NAIL AND WASHER IN A 10 IN ASH TREE
 HV2127'ON 16TH ST., AND 21.31 FT SOUTH OF THE SOUTH CORNER OF A WALK IN
 HV2127'FRONT OF BUILDING NO. 5921.  A BRASS DISC SET IN A 12 IN CONC
 HV2127'MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID
 HV2127'LABELED SURVEY.
 HV2127
 HV2127                          STATION RECOVERY (1971)
 HV2127
 HV2127'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2127'THE STATION WAS RECOVERED AND IN GOOD CONDITION.  HOWEVER, THE LID
 HV2127'TO THE MANHOLE COVERING THE STATION HAS BEEN BROKEN.  THE MARK IS
 HV2127'ABOUT 8-INCHES BELOW THE GROUND SURFACE.  THE BROKEN PARTS OF THE
 HV2127'MANHOLE LID WERE LAID OVER THE MARK AND COVERED WITH DIRT.  SOME
 HV2127'NEW MEASUREMENTS TO STATION ARE GIVEN.  17.0 FEET NORTH OF THE
 HV2127'TOP NUT ON A FIRE HYDRANT, 15.8 FEET EAST OF THE FACE OF CURB,
 HV2127'AND THE DISTANCES GIVEN TO REFERENCE POINTS ON TREES SHOULD
 HV2127'BE REVERSED.
 HV2127'
 HV2127'NW 125-AZ.  THIS MARK WAS RECOVERED AS DESCRIBED AND FOUND IN
 HV2127'GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2126 ***********************************************************************
 HV2126  DESIGNATION -  NW 125 A DCDHT
 HV2126  PID         -  HV2126
 HV2126  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2126  COUNTRY     -  US
 HV2126  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2126
 HV2126                         *CURRENT SURVEY CONTROL
 HV2126  ______________________________________________________________________
 HV2126* NAD 83(1993) POSITION- 38 57 55.94226(N) 077 02 10.47510(W)   ADJUSTED
 HV2126* NAVD 88 ORTHO HEIGHT -    62.615 (meters)      205.43  (feet) ADJUSTED
 HV2126  ______________________________________________________________________
 HV2126  GEOID HEIGHT    -        -31.980 (meters)                     GEOID18
 HV2126  LAPLACE CORR    -         -2.48  (seconds)                    DEFLEC18
 HV2126  DYNAMIC HEIGHT  -         62.581 (meters)      205.32  (feet) COMP
 HV2126  MODELED GRAVITY -    980,090.2   (mgal)                       NAVD 88
 HV2126
 HV2126  HORZ ORDER      -  SECOND
 HV2126  VERT ORDER      -  SECOND    CLASS 0
 HV2126
 HV2126.The horizontal coordinates were established by classical geodetic methods
 HV2126.and adjusted by the National Geodetic Survey in November 1994.
 HV2126
 HV2126.The orthometric height was determined by differential leveling and
 HV2126.adjusted by the NATIONAL GEODETIC SURVEY
 HV2126.in June 1991.
 HV2126
 HV2126.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2126.GEOID18 height accuracy estimate available here.
 HV2126
 HV2126.Click photographs - Photos may exist for this station.
 HV2126
 HV2126.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2126
 HV2126.The dynamic height is computed by dividing the NAVD 88
 HV2126.geopotential number by the normal gravity value computed on the
 HV2126.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2126.degrees latitude (g = 980.6199 gals.).
 HV2126
 HV2126.The modeled gravity was interpolated from observed gravity values.
 HV2126
 HV2126. The following values were computed from the NAD 83(1993) position.
 HV2126
 HV2126;                    North         East     Units Scale Factor Converg.
 HV2126;SPC MD       -   144,181.381   396,859.023   MT  0.99995107   -0 01 21.9
 HV2126;SPC MD       -   473,035.08  1,302,028.31   sFT  0.99995107   -0 01 21.9
 HV2126;SPC VA N     - 2,145,187.029 3,626,851.894   MT  0.99996679   +0 54 48.8
 HV2126;SPC VA N     - 7,038,001.11 11,899,096.59   sFT  0.99996679   +0 54 48.8
 HV2126;UTM  18      - 4,314,924.282   323,584.795   MT  0.99998324   -1 16 51.0
 HV2126
 HV2126!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2126!SPC MD       -   0.99999519  x   0.99995107  =   0.99994626
 HV2126!SPC VA N     -   0.99999519  x   0.99996679  =   0.99996198
 HV2126!UTM  18      -   0.99999519  x   0.99998324  =   0.99997843
 HV2126
 HV2126:                Primary Azimuth Mark                     Grid Az
 HV2126:SPC MD       -  NW 125                                   180 03 31.3
 HV2126:SPC VA N     -  NW 125                                   179 07 20.6
 HV2126:UTM  18      -  NW 125                                   181 19 00.4
 HV2126
 HV2126_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2358414924(NAD 83)
 HV2126
 HV2126|---------------------------------------------------------------------|
 HV2126| PID    Reference Object                     Distance      Geod. Az  |
 HV2126|                                                           dddmmss.s |
 HV2126| HV2127 NW 125                              436.176 METERS 1800209.4 |
 HV2126| HV2125 NW 125 B MADHOP                     464.790 METERS 3595401.5 |
 HV2126|---------------------------------------------------------------------|
 HV2126
 HV2126                          SUPERSEDED SURVEY CONTROL
 HV2126
 HV2126  NAD 83(1991)-  38 57 55.94133(N)    077 02 10.47605(W) AD(       ) 2
 HV2126  NAD 83(1986)-  38 57 55.94088(N)    077 02 10.48584(W) AD(       ) 2
 HV2126  NAD 27      -  38 57 55.54750(N)    077 02 11.55880(W) AD(       ) 2
 HV2126  NGVD 29              62.85   (m)          206.2    (f) LEVELING    3  
 HV2126  NGVD 29 (11/26/84)   62.846  (m)          206.19   (f) ADJUSTED    2 0
 HV2126
 HV2126.Superseded values are not recommended for survey control.
 HV2126
 HV2126.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2126.See file dsdata.pdf to determine how the superseded data were derived.
 HV2126
 HV2126_MARKER: DD = SURVEY DISK
 HV2126_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2126_SP_SET: SIDEWALK
 HV2126_STAMPING: USCGS NO NW 126 A
 HV2126_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2126
 HV2126  HISTORY     - Date     Condition        Report By
 HV2126  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2126  HISTORY     - 1960     GOOD             MADHOP
 HV2126  HISTORY     - 1971     GOOD             NGS
 HV2126
 HV2126                          STATION DESCRIPTION
 HV2126
 HV2126'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2126'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2126'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.W. 126-A
 HV2126'GROUTED CONCRETE WALK.
 HV2126
 HV2126                          STATION RECOVERY (1960)
 HV2126
 HV2126'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2126'IN WASHINGTON DC.
 HV2126'LOCATED NEAR THE CORNER OF 16TH ST. N.W. AND RITTENHOUSE ST. N.W.
 HV2126'5.20 FT SOUTH OF A CROSS CUT IN THE RIM OF A MANHOLE IN FRONT
 HV2126'OF BUILDING NO. 6201, AND 11.23 FT EAST OF A NAIL AND WASHER IN AN
 HV2126'8 IN ASH TREE, AND 26.48 FT NORTHWEST OF THE SOUTHWEST CORNER OF
 HV2126'A STEEL CATCH BASIN.  A STANDARD BRASS DISC GROUTED IN A CONCRETE
 HV2126'WALK.
 HV2126
 HV2126                          STATION RECOVERY (1971)
 HV2126
 HV2126'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2126'STATION RECOVERED AS DESCRIBED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2125 ***********************************************************************
 HV2125  DESIGNATION -  NW 125 B MADHOP
 HV2125  PID         -  HV2125
 HV2125  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2125  COUNTRY     -  US
 HV2125  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2125
 HV2125                         *CURRENT SURVEY CONTROL
 HV2125  ______________________________________________________________________
 HV2125* NAD 83(1993) POSITION- 38 58 11.01449(N) 077 02 10.50866(W)   ADJUSTED
 HV2125* NAVD 88 ORTHO HEIGHT -    83.264 (meters)      273.18  (feet) ADJUSTED
 HV2125  ______________________________________________________________________
 HV2125  GEOID HEIGHT    -        -31.976 (meters)                     GEOID18
 HV2125  LAPLACE CORR    -         -2.50  (seconds)                    DEFLEC18
 HV2125  DYNAMIC HEIGHT  -         83.219 (meters)      273.03  (feet) COMP
 HV2125  MODELED GRAVITY -    980,089.4   (mgal)                       NAVD 88
 HV2125
 HV2125  HORZ ORDER      -  SECOND
 HV2125  VERT ORDER      -  SECOND    CLASS 0
 HV2125
 HV2125.The horizontal coordinates were established by classical geodetic methods
 HV2125.and adjusted by the National Geodetic Survey in November 1994.
 HV2125
 HV2125.The orthometric height was determined by differential leveling and
 HV2125.adjusted by the NATIONAL GEODETIC SURVEY
 HV2125.in June 1991.
 HV2125
 HV2125.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2125.GEOID18 height accuracy estimate available here.
 HV2125
 HV2125.Click photographs - Photos may exist for this station.
 HV2125
 HV2125.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2125
 HV2125.The dynamic height is computed by dividing the NAVD 88
 HV2125.geopotential number by the normal gravity value computed on the
 HV2125.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2125.degrees latitude (g = 980.6199 gals.).
 HV2125
 HV2125.The modeled gravity was interpolated from observed gravity values.
 HV2125
 HV2125. The following values were computed from the NAD 83(1993) position.
 HV2125
 HV2125;                    North         East     Units Scale Factor Converg.
 HV2125;SPC MD       -   144,646.148   396,858.400   MT  0.99995119   -0 01 21.9
 HV2125;SPC MD       -   474,559.90  1,302,026.27   sFT  0.99995119   -0 01 21.9
 HV2125;SPC VA N     - 2,145,651.731 3,626,843.676   MT  0.99996724   +0 54 48.8
 HV2125;SPC VA N     - 7,039,525.72 11,899,069.63   sFT  0.99996724   +0 54 48.8
 HV2125;UTM  18      - 4,315,388.965   323,594.376   MT  0.99998320   -1 16 51.4
 HV2125
 HV2125!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2125!SPC MD       -   0.99999195  x   0.99995119  =   0.99994314
 HV2125!SPC VA N     -   0.99999195  x   0.99996724  =   0.99995919
 HV2125!UTM  18      -   0.99999195  x   0.99998320  =   0.99997515
 HV2125
 HV2125:                Primary Azimuth Mark                     Grid Az
 HV2125:SPC MD       -  NW 125 A DCDHT                           179 55 23.4
 HV2125:SPC VA N     -  NW 125 A DCDHT                           178 59 12.7
 HV2125:UTM  18      -  NW 125 A DCDHT                           181 10 52.9
 HV2125
 HV2125_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2359415388(NAD 83)
 HV2125
 HV2125|---------------------------------------------------------------------|
 HV2125| PID    Reference Object                     Distance      Geod. Az  |
 HV2125|                                                           dddmmss.s |
 HV2125| HV2124 NW 126                              272.743 METERS 00004     |
 HV2125| HV2126 NW 125 A DCDHT                      464.790 METERS 1795401.5 |
 HV2125|---------------------------------------------------------------------|
 HV2125
 HV2125                          SUPERSEDED SURVEY CONTROL
 HV2125
 HV2125  NAD 83(1991)-  38 58 11.01356(N)    077 02 10.50956(W) AD(       ) 2
 HV2125  NAD 83(1986)-  38 58 11.01311(N)    077 02 10.51935(W) AD(       ) 2
 HV2125  NAD 27      -  38 58 10.62040(N)    077 02 11.59400(W) AD(       ) 2
 HV2125  NGVD 29              83.50   (m)          273.9    (f) LEVELING    3  
 HV2125  NGVD 29 (11/26/84)   83.495  (m)          273.93   (f) ADJUSTED    2 0
 HV2125
 HV2125.Superseded values are not recommended for survey control.
 HV2125
 HV2125.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2125.See file dsdata.pdf to determine how the superseded data were derived.
 HV2125
 HV2125_MARKER: Z = SEE DESCRIPTION
 HV2125_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2125_SP_SET: SIDEWALK
 HV2125_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2125
 HV2125  HISTORY     - Date     Condition        Report By
 HV2125  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2125  HISTORY     - 1960     GOOD             MADHOP
 HV2125  HISTORY     - 1971     GOOD             NGS
 HV2125
 HV2125                          STATION DESCRIPTION
 HV2125
 HV2125'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2125'IN WASHINGTON DC.
 HV2125'LOCATED ON 16TH ST. N.W. IN FRONT OF BUILDING NO. 6517.  6.35 FT
 HV2125'NORTHWEST OF THE SOUTH CORNER OF THE CONC. STEPS IN FRONT OF
 HV2125'BUILDING 6517, AND 8.62 FT EAST OF THE FACE OF 16TH ST. CURB,
 HV2125'AND 13.58 FT SOUTHWEST OF A CROSS CUT IN THE RIM OF A MANHOLE
 HV2125'IN THE CONCRETE WALK PARALLEL TO 16TH ST.  A PIPE AND SCREW AT
 HV2125'THE EDGE OF THE WALK.
 HV2125
 HV2125                          STATION RECOVERY (1971)
 HV2125
 HV2125'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2125'THE STATION AND REFERENCE POINTS RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2124 ***********************************************************************
 HV2124  DESIGNATION -  NW 126
 HV2124  PID         -  HV2124
 HV2124  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2124  COUNTRY     -  US
 HV2124  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2124
 HV2124                         *CURRENT SURVEY CONTROL
 HV2124  ______________________________________________________________________
 HV2124* NAD 83(1993) POSITION- 38 58 19.85900(N) 077 02 10.49581(W)   ADJUSTED
 HV2124* NAVD 88 ORTHO HEIGHT -    80.307 (meters)      263.47  (feet) ADJUSTED
 HV2124  ______________________________________________________________________
 HV2124  GEOID HEIGHT    -        -31.975 (meters)                     GEOID18
 HV2124  LAPLACE CORR    -         -2.48  (seconds)                    DEFLEC18
 HV2124  DYNAMIC HEIGHT  -         80.264 (meters)      263.33  (feet) COMP
 HV2124  MODELED GRAVITY -    980,089.0   (mgal)                       NAVD 88
 HV2124
 HV2124  HORZ ORDER      -  SECOND
 HV2124  VERT ORDER      -  SECOND    CLASS 0
 HV2124
 HV2124.The horizontal coordinates were established by classical geodetic methods
 HV2124.and adjusted by the National Geodetic Survey in November 1994.
 HV2124
 HV2124.The orthometric height was determined by differential leveling and
 HV2124.adjusted by the NATIONAL GEODETIC SURVEY
 HV2124.in June 1991.
 HV2124
 HV2124.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2124.GEOID18 height accuracy estimate available here.
 HV2124
 HV2124.Click photographs - Photos may exist for this station.
 HV2124
 HV2124.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2124
 HV2124.The dynamic height is computed by dividing the NAVD 88
 HV2124.geopotential number by the normal gravity value computed on the
 HV2124.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2124.degrees latitude (g = 980.6199 gals.).
 HV2124
 HV2124.The modeled gravity was interpolated from observed gravity values.
 HV2124
 HV2124. The following values were computed from the NAD 83(1993) position.
 HV2124
 HV2124;                    North         East     Units Scale Factor Converg.
 HV2124;SPC MD       -   144,918.877   396,858.818   MT  0.99995126   -0 01 21.9
 HV2124;SPC MD       -   475,454.68  1,302,027.64   sFT  0.99995126   -0 01 21.9
 HV2124;SPC VA N     - 2,145,924.435 3,626,839.637   MT  0.99996750   +0 54 48.8
 HV2124;SPC VA N     - 7,040,420.42 11,899,056.38   sFT  0.99996750   +0 54 48.8
 HV2124;UTM  18      - 4,315,661.628   323,600.783   MT  0.99998317   -1 16 51.7
 HV2124
 HV2124!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2124!SPC MD       -   0.99999242  x   0.99995126  =   0.99994368
 HV2124!SPC VA N     -   0.99999242  x   0.99996750  =   0.99995992
 HV2124!UTM  18      -   0.99999242  x   0.99998317  =   0.99997559
 HV2124
 HV2124:                Primary Azimuth Mark                     Grid Az
 HV2124:SPC MD       -  NW 126 A MADHOP                          000 18 53.7
 HV2124:SPC VA N     -  NW 126 A MADHOP                          359 22 43.0
 HV2124:UTM  18      -  NW 126 A MADHOP                          001 34 23.5
 HV2124
 HV2124_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2360015661(NAD 83)
 HV2124
 HV2124|---------------------------------------------------------------------|
 HV2124| PID    Reference Object                     Distance      Geod. Az  |
 HV2124|                                                           dddmmss.s |
 HV2124| DC6945 NW 126 AZ MK                                       0000633.6 |
 HV2124| HV2137 NW 126 A MADHOP                     439.113 METERS 0001731.8 |
 HV2124| HV4529 N W 125 C POL                       244.021 METERS 18002     |
 HV2124| HV2125 NW 125 B MADHOP                     272.743 METERS 18004     |
 HV2124|---------------------------------------------------------------------|
 HV2124
 HV2124                          SUPERSEDED SURVEY CONTROL
 HV2124
 HV2124  NAD 83(1991)-  38 58 19.85810(N)    077 02 10.49669(W) AD(       ) 2
 HV2124  NAD 83(1986)-  38 58 19.85767(N)    077 02 10.50647(W) AD(       ) 2
 HV2124  NAD 27      -  38 58 19.46490(N)    077 02 11.58240(W) AD(       ) 2
 HV2124  NGVD 29              80.54   (m)          264.2    (f) LEVELING    3  
 HV2124  NGVD 29 (11/26/84)   80.539  (m)          264.24   (f) ADJUSTED    2 0
 HV2124
 HV2124.Superseded values are not recommended for survey control.
 HV2124
 HV2124.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2124.See file dsdata.pdf to determine how the superseded data were derived.
 HV2124
 HV2124_MARKER: DD = SURVEY DISK
 HV2124_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2124_SP_SET: MONUMENT
 HV2124_STAMPING: USCGS NC NW 126
 HV2124_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2124
 HV2124  HISTORY     - Date     Condition        Report By
 HV2124  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2124  HISTORY     - 1960     GOOD             MADHOP
 HV2124  HISTORY     - 1971     GOOD             NGS
 HV2124  HISTORY     - 1979     GOOD             NGS
 HV2124
 HV2124                          STATION DESCRIPTION
 HV2124
 HV2124'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2124'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2124'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO NW 126 SET IN
 HV2124'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2124'COVER WITH LID LABELED SURVEY.
 HV2124'
 HV2124'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2124'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NW 126-AZ. SET
 HV2124'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV2124'MANHOLE COVER WITH LID LABELED SURVEY.
 HV2124
 HV2124                          STATION RECOVERY (1960)
 HV2124
 HV2124'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2124'IN WASHINGTON DC.
 HV2124'LOCATED AT THE INTERSECTION OF 16TH ST. N.W. AND ASPEN ST. N.W.
 HV2124'40.65 FT NORTH OF A NAIL AND WASHER SET IN A 14 IN ASH TREE,
 HV2124'AND 24.80 FT SOUTHEAST OF A CROSS CUT IN A SEWER MANHOLE IN THE
 HV2124'SOUTHEAST AREA OF THE ROAD INTERSECTION, AND 17.50 FT SOUTHWEST
 HV2124'OF A CROSS CUT IN A SEWER MANHOLE ON THE SOUTH EDGE OF ASPEN STREET.
 HV2124'SET IN A 12 IN CONC MONUMENT 6 IN UNDER SURFACE WITH GRATE ON TOP
 HV2124'MARKED SURVEY.
 HV2124
 HV2124                          STATION RECOVERY (1971)
 HV2124
 HV2124'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2124'THE STATION AND ALL REFERENCE POINTS RECOVERED.  THE STATION IS
 HV2124'ALSO 49.0 FEET WEST FROM THE TOP NUT ON FIRE HYDRANT AND 7.9
 HV2124'FEET EAST OF THE FACE OF CURB.
 HV2124'
 HV2124'NW 126-AZ. WAS NOT RECOVERED AND IS BELIEVED TO BE DESTROYED.
 HV2124
 HV2124                          STATION RECOVERY (1979)
 HV2124
 HV2124'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 (RGP)
 HV2124'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2137 ***********************************************************************
 HV2137  DESIGNATION -  NW 126 A MADHOP
 HV2137  PID         -  HV2137
 HV2137  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2137  COUNTRY     -  US
 HV2137  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2137
 HV2137                         *CURRENT SURVEY CONTROL
 HV2137  ______________________________________________________________________
 HV2137* NAD 83(1993) POSITION- 38 58 34.09839(N) 077 02 10.40279(W)   ADJUSTED
 HV2137* NAVD 88 ORTHO HEIGHT -    96.964 (meters)      318.12  (feet) ADJUSTED
 HV2137  ______________________________________________________________________
 HV2137  GEOID HEIGHT    -        -31.972 (meters)                     GEOID18
 HV2137  LAPLACE CORR    -         -2.45  (seconds)                    DEFLEC18
 HV2137  DYNAMIC HEIGHT  -         96.912 (meters)      317.95  (feet) COMP
 HV2137  MODELED GRAVITY -    980,088.3   (mgal)                       NAVD 88
 HV2137
 HV2137  HORZ ORDER      -  SECOND
 HV2137  VERT ORDER      -  SECOND    CLASS 0
 HV2137
 HV2137.The horizontal coordinates were established by classical geodetic methods
 HV2137.and adjusted by the National Geodetic Survey in November 1994.
 HV2137
 HV2137.The orthometric height was determined by differential leveling and
 HV2137.adjusted by the NATIONAL GEODETIC SURVEY
 HV2137.in June 1991.
 HV2137
 HV2137.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2137.GEOID18 height accuracy estimate available here.
 HV2137
 HV2137.Click photographs - Photos may exist for this station.
 HV2137
 HV2137.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2137
 HV2137.The dynamic height is computed by dividing the NAVD 88
 HV2137.geopotential number by the normal gravity value computed on the
 HV2137.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2137.degrees latitude (g = 980.6199 gals.).
 HV2137
 HV2137.The modeled gravity was interpolated from observed gravity values.
 HV2137
 HV2137. The following values were computed from the NAD 83(1993) position.
 HV2137
 HV2137;                    North         East     Units Scale Factor Converg.
 HV2137;SPC MD       -   145,357.962   396,861.231   MT  0.99995138   -0 01 21.8
 HV2137;SPC MD       -   476,895.25  1,302,035.56   sFT  0.99995138   -0 01 21.8
 HV2137;SPC VA N     - 2,146,363.508 3,626,834.874   MT  0.99996793   +0 54 48.8
 HV2137;SPC VA N     - 7,041,860.94 11,899,040.75   sFT  0.99996793   +0 54 48.8
 HV2137;UTM  18      - 4,316,100.568   323,612.838   MT  0.99998312   -1 16 52.0
 HV2137
 HV2137!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2137!SPC MD       -   0.99998980  x   0.99995138  =   0.99994118
 HV2137!SPC VA N     -   0.99998980  x   0.99996793  =   0.99995773
 HV2137!UTM  18      -   0.99998980  x   0.99998312  =   0.99997292
 HV2137
 HV2137:                Primary Azimuth Mark                     Grid Az
 HV2137:SPC MD       -  NW 126                                   180 18 53.6
 HV2137:SPC VA N     -  NW 126                                   179 22 43.0
 HV2137:UTM  18      -  NW 126                                   181 34 23.8
 HV2137
 HV2137_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2361216100(NAD 83)
 HV2137
 HV2137|---------------------------------------------------------------------|
 HV2137| PID    Reference Object                     Distance      Geod. Az  |
 HV2137|                                                           dddmmss.s |
 HV2137| HV2124 NW 126                              439.113 METERS 1801731.8 |
 HV2137| HV2136 NW 126 B MADHOP                     185.237 METERS 35944     |
 HV2137|---------------------------------------------------------------------|
 HV2137
 HV2137                          SUPERSEDED SURVEY CONTROL
 HV2137
 HV2137  NAD 83(1991)-  38 58 34.09751(N)    077 02 10.40363(W) AD(       ) 2
 HV2137  NAD 83(1986)-  38 58 34.09710(N)    077 02 10.41340(W) AD(       ) 2
 HV2137  NAD 27      -  38 58 33.70420(N)    077 02 11.49100(W) AD(       ) 2
 HV2137  NGVD 29              97.20   (m)          318.9    (f) LEVELING    3  
 HV2137  NGVD 29 (11/26/84)   97.195  (m)          318.88   (f) ADJUSTED    2 0
 HV2137
 HV2137.Superseded values are not recommended for survey control.
 HV2137
 HV2137.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2137.See file dsdata.pdf to determine how the superseded data were derived.
 HV2137
 HV2137_MARKER: DD = SURVEY DISK
 HV2137_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2137_SP_SET: SIDEWALK
 HV2137_STAMPING: USCGS NO NW 126-C
 HV2137_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2137
 HV2137  HISTORY     - Date     Condition        Report By
 HV2137  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2137  HISTORY     - 1960     GOOD             MADHOP
 HV2137  HISTORY     - 1971     GOOD             NGS
 HV2137  HISTORY     - 1979     GOOD             NGS
 HV2137
 HV2137                          STATION DESCRIPTION
 HV2137
 HV2137'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2137'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2137'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.W. 126-C
 HV2137'GROUTED IN CONCRETE WALK.
 HV2137
 HV2137                          STATION RECOVERY (1960)
 HV2137
 HV2137'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2137'IN WASHINGTON DC.
 HV2137'ABOUT 350 FT NORTH OF ALASKA AVE. ON 16TH ST. N.W. 14.05 FT
 HV2137'SOUTHEAST OF P.C. OF GRANITE CURB RETURN, AND 13.38 FT NORTH OF
 HV2137'CROSSCUT IN RIM OF P.E.P.C.O. M.H. ON FLOOR OF CONCRETE ALLEY
 HV2137'PERPENDICULAR TO 16TH ST. N.W., AND 59.08 FT NORTHWEST OF NAIL
 HV2137'AND WASHER IN BASE OF P.E.P.S.C.O. POLE 422108 BESIDE BUILDING
 HV2137'NO. 7031 IN CONCRETE ALLEY.  A STANDARD BRASS DISC GROUTED IN
 HV2137'CONCRETE WALK.
 HV2137
 HV2137                          STATION RECOVERY (1971)
 HV2137
 HV2137'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2137'THE STATION AND ALL REFERENCE POINTS RECOVERED AS DESCRIBED.
 HV2137
 HV2137                          STATION RECOVERY (1979)
 HV2137
 HV2137'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 (RGP)
 HV2137'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2136 ***********************************************************************
 HV2136  DESIGNATION -  NW 126 B MADHOP
 HV2136  PID         -  HV2136
 HV2136  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2136  COUNTRY     -  US
 HV2136  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2136
 HV2136                         *CURRENT SURVEY CONTROL
 HV2136  ______________________________________________________________________
 HV2136* NAD 83(1993) POSITION- 38 58 40.10520(N) 077 02 10.43857(W)   ADJUSTED
 HV2136* NAVD 88 ORTHO HEIGHT -   101.249 (meters)      332.18  (feet) ADJUSTED
 HV2136  ______________________________________________________________________
 HV2136  GEOID HEIGHT    -        -31.970 (meters)                     GEOID18
 HV2136  LAPLACE CORR    -         -2.44  (seconds)                    DEFLEC18
 HV2136  DYNAMIC HEIGHT  -        101.194 (meters)      332.00  (feet) COMP
 HV2136  MODELED GRAVITY -    980,088.0   (mgal)                       NAVD 88
 HV2136
 HV2136  HORZ ORDER      -  SECOND
 HV2136  VERT ORDER      -  SECOND    CLASS 0
 HV2136
 HV2136.The horizontal coordinates were established by classical geodetic methods
 HV2136.and adjusted by the National Geodetic Survey in November 1994.
 HV2136
 HV2136.The orthometric height was determined by differential leveling and
 HV2136.adjusted by the NATIONAL GEODETIC SURVEY
 HV2136.in June 1991.
 HV2136
 HV2136.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2136.GEOID18 height accuracy estimate available here.
 HV2136
 HV2136.Click photographs - Photos may exist for this station.
 HV2136
 HV2136.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2136
 HV2136.The dynamic height is computed by dividing the NAVD 88
 HV2136.geopotential number by the normal gravity value computed on the
 HV2136.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2136.degrees latitude (g = 980.6199 gals.).
 HV2136
 HV2136.The modeled gravity was interpolated from observed gravity values.
 HV2136
 HV2136. The following values were computed from the NAD 83(1993) position.
 HV2136
 HV2136;                    North         East     Units Scale Factor Converg.
 HV2136;SPC MD       -   145,543.188   396,860.443   MT  0.99995143   -0 01 21.9
 HV2136;SPC MD       -   477,502.94  1,302,032.97   sFT  0.99995143   -0 01 21.9
 HV2136;SPC VA N     - 2,146,548.700 3,626,831.060   MT  0.99996811   +0 54 48.8
 HV2136;SPC VA N     - 7,042,468.53 11,899,028.24   sFT  0.99996811   +0 54 48.8
 HV2136;UTM  18      - 4,316,285.773   323,616.119   MT  0.99998310   -1 16 52.2
 HV2136
 HV2136!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2136!SPC MD       -   0.99998913  x   0.99995143  =   0.99994056
 HV2136!SPC VA N     -   0.99998913  x   0.99996811  =   0.99995724
 HV2136!UTM  18      -   0.99998913  x   0.99998310  =   0.99997223
 HV2136
 HV2136_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2361616285(NAD 83)
 HV2136
 HV2136                          SUPERSEDED SURVEY CONTROL
 HV2136
 HV2136  NAD 83(1991)-  38 58 40.10434(N)    077 02 10.43940(W) AD(       ) 2
 HV2136  NAD 83(1986)-  38 58 40.10395(N)    077 02 10.44916(W) AD(       ) 2
 HV2136  NAD 27      -  38 58 39.71090(N)    077 02 11.52740(W) AD(       ) 2
 HV2136  NGVD 29             101.48   (m)          332.9    (f) LEVELING    3  
 HV2136  NGVD 29 (11/26/84)  101.480  (m)          332.94   (f) ADJUSTED    2 0
 HV2136
 HV2136.Superseded values are not recommended for survey control.
 HV2136
 HV2136.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2136.See file dsdata.pdf to determine how the superseded data were derived.
 HV2136
 HV2136_MARKER: DD = SURVEY DISK
 HV2136_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2136_SP_SET: SIDEWALK
 HV2136_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2136
 HV2136  HISTORY     - Date     Condition        Report By
 HV2136  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2136  HISTORY     - 1960     GOOD             MADHOP
 HV2136  HISTORY     - 1971     GOOD             NGS
 HV2136  HISTORY     - 1979     GOOD             NGS
 HV2136
 HV2136                          STATION DESCRIPTION
 HV2136
 HV2136'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2136'IN WASHINGTON DC.
 HV2136'NORTH OF ALASKA AVE ON 16TH ST. N.W. IN FRONT OF BUILDING 7215.
 HV2136'23.42 FT NORTHEAST OF A NAIL AND WASHER IN A 12 IN ASH BESIDE THE
 HV2136'FACE OF 16TH ST. CURB, 24.89 FT SOUTHWEST OF THE NORTHWEST CORNER
 HV2136'OF A BRICK RETAINING WALL SURROUNDING BUILDING 7215.  A PIPE AND
 HV2136'SCREW AT INTERSECTION OF WALKS.
 HV2136
 HV2136                          STATION RECOVERY (1971)
 HV2136
 HV2136'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2136'THE STATION WAS RECOVERED.  THE NAIL AND WASHER IN 12-INCH ASH
 HV2136'TREE IS GONE.  THE STATION IS ALSO 19.5 FEET NORTH-NORTHEAST OF
 HV2136'THE TOP NUT OF A FIRE HYDRANT.
 HV2136
 HV2136                          STATION RECOVERY (1979)
 HV2136
 HV2136'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 (RGP)
 HV2136'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2135 ***********************************************************************
 HV2135  DESIGNATION -  NW 127
 HV2135  PID         -  HV2135
 HV2135  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2135  COUNTRY     -  US
 HV2135  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2135
 HV2135                         *CURRENT SURVEY CONTROL
 HV2135  ______________________________________________________________________
 HV2135* NAD 83(1993) POSITION- 38 58 59.95299(N) 077 02 10.44113(W)   ADJUSTED
 HV2135* NAVD 88 ORTHO HEIGHT -    78.287 (meters)      256.85  (feet) ADJUSTED
 HV2135  ______________________________________________________________________
 HV2135  GEOID HEIGHT    -        -31.967 (meters)                     GEOID18
 HV2135  LAPLACE CORR    -         -2.44  (seconds)                    DEFLEC18
 HV2135  DYNAMIC HEIGHT  -         78.245 (meters)      256.71  (feet) COMP
 HV2135  MODELED GRAVITY -    980,087.1   (mgal)                       NAVD 88
 HV2135
 HV2135  HORZ ORDER      -  SECOND
 HV2135  VERT ORDER      -  SECOND    CLASS 0
 HV2135
 HV2135.The horizontal coordinates were established by classical geodetic methods
 HV2135.and adjusted by the National Geodetic Survey in November 1994.
 HV2135
 HV2135.The orthometric height was determined by differential leveling and
 HV2135.adjusted by the NATIONAL GEODETIC SURVEY
 HV2135.in June 1991.
 HV2135
 HV2135.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2135.GEOID18 height accuracy estimate available here.
 HV2135
 HV2135.Click photographs - Photos may exist for this station.
 HV2135
 HV2135.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2135
 HV2135.The dynamic height is computed by dividing the NAVD 88
 HV2135.geopotential number by the normal gravity value computed on the
 HV2135.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2135.degrees latitude (g = 980.6199 gals.).
 HV2135
 HV2135.The modeled gravity was interpolated from observed gravity values.
 HV2135
 HV2135. The following values were computed from the NAD 83(1993) position.
 HV2135
 HV2135;                    North         East     Units Scale Factor Converg.
 HV2135;SPC MD       -   146,155.215   396,860.625   MT  0.99995160   -0 01 21.9
 HV2135;SPC MD       -   479,510.90  1,302,033.57   sFT  0.99995160   -0 01 21.9
 HV2135;SPC VA N     - 2,147,160.659 3,626,821.240   MT  0.99996872   +0 54 48.8
 HV2135;SPC VA N     - 7,044,476.26 11,898,996.02   sFT  0.99996872   +0 54 48.8
 HV2135;UTM  18      - 4,316,897.668   323,629.742   MT  0.99998304   -1 16 52.7
 HV2135
 HV2135!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2135!SPC MD       -   0.99999273  x   0.99995160  =   0.99994433
 HV2135!SPC VA N     -   0.99999273  x   0.99996872  =   0.99996145
 HV2135!UTM  18      -   0.99999273  x   0.99998304  =   0.99997577
 HV2135
 HV2135:                Primary Azimuth Mark                     Grid Az
 HV2135:SPC MD       -  NW 127 AZ MK                             000 19 56.3
 HV2135:SPC VA N     -  NW 127 AZ MK                             359 23 45.6
 HV2135:UTM  18      -  NW 127 AZ MK                             001 35 27.1
 HV2135
 HV2135_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2362916897(NAD 83)
 HV2135
 HV2135|---------------------------------------------------------------------|
 HV2135| PID    Reference Object                     Distance      Geod. Az  |
 HV2135|                                                           dddmmss.s |
 HV2135| DC6946 NW 127 AZ MK                                       0001834.4 |
 HV2135| HV4298 N W 126 C 1960                      332.901 METERS 18006     |
 HV2135| HV4305 N W 127 A 1960                      468.979 METERS 3575212.8 |
 HV2135|---------------------------------------------------------------------|
 HV2135
 HV2135                          SUPERSEDED SURVEY CONTROL
 HV2135
 HV2135  NAD 83(1991)-  38 58 59.95216(N)    077 02 10.44191(W) AD(       ) 2
 HV2135  NAD 83(1986)-  38 58 59.95182(N)    077 02 10.45164(W) AD(       ) 2
 HV2135  NAD 27      -  38 58 59.55860(N)    077 02 11.53120(W) AD(       ) 2
 HV2135  NGVD 29              78.52   (m)          257.6    (f) LEVELING    3  
 HV2135  NGVD 29 (11/26/84)   78.519  (m)          257.61   (f) ADJUSTED    2 0
 HV2135
 HV2135.Superseded values are not recommended for survey control.
 HV2135
 HV2135.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2135.See file dsdata.pdf to determine how the superseded data were derived.
 HV2135
 HV2135_MARKER: DD = SURVEY DISK
 HV2135_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2135_SP_SET: MONUMENT
 HV2135_STAMPING: USCGS NO NW 127
 HV2135_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2135
 HV2135  HISTORY     - Date     Condition        Report By
 HV2135  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2135  HISTORY     - 1960     GOOD             MADHOP
 HV2135  HISTORY     - 1966     GOOD             LOCENG
 HV2135  HISTORY     - 1971     GOOD             NGS
 HV2135
 HV2135                          STATION DESCRIPTION
 HV2135
 HV2135'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2135'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2135'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.W. 127 SET IN
 HV2135'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2135'COVER WITH LID LABELED SURVEY.
 HV2135'
 HV2135'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2135'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO NW 127-AZ.  SET
 HV2135'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV2135'MANHOLE COVER WITH LID LABELED SURVEY.
 HV2135'
 HV2135'NO GEOGRAPHIC POSITION
 HV2135
 HV2135                          STATION RECOVERY (1960)
 HV2135
 HV2135'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2135'IN WASHINGTON DC.
 HV2135'NEAR THE INTERSECTION OF 16TH ST. N.W. AND JUNIPER ST. N.W. IN
 HV2135'FRONT OF TIFFERETH ISRAEL CONGREGATION CHURCH ON THE EAST SIDE
 HV2135'OF 16TH ST. 13.88 FT NORTHEAST OF A CROSS CUT IN THE NORTHEAST
 HV2135'CORNER OF A STEEL BASE OF LIGHT POLE ON THE EAST SIDE OF 16TH
 HV2135'ST. AND NORTH OF JUNIPER ST., AND 4.90 FT EAST OF A RAMSET NAIL
 HV2135'IN THE TOP OF THE EAST SIDE OF 16TH ST. CURB, AND 12.39 FT
 HV2135'SOUTHEAST OF A SECOND NAIL (DIRECTLY NORTH OF THE PREVIOUS NAIL)
 HV2135'IN THE TOP OF THE EAST SIDE OF 16TH ST. CURB.  A CONCRETE
 HV2135'MONUMENT 6 IN BELOW SURFACE WITH GRATE COVER MARKED SURVEY.
 HV2135
 HV2135                          STATION RECOVERY (1966)
 HV2135
 HV2135'RECOVERY NOTE BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (CB)
 HV2135'RECOVERED BY DE LEUW CATHER CO.
 HV2135'
 HV2135'GOOD
 HV2135'
 HV2135'ALL TIES IN GOOD CONDITION
 HV2135
 HV2135                          STATION RECOVERY (1971)
 HV2135
 HV2135'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2135'STATION AND REFERENCE POINTS RECOVERED AS DESCRIBED.  IT IS ALSO
 HV2135'4 FEET WEST OF WEST EDGE OF SIDEWALK AND 2-INCHES UNDER GROUND
 HV2135'SURFACE.
 HV2135'
 HV2135'NW 127-AZ. WAS RECOVERED IN GOOD CONDITION.  FOLLOWING ARE SOME
 HV2135'ADDITIONAL MEASUREMENTS.  8.15 FEET EAST OF FACE OF CURB AND
 HV2135'1.0 FOOT WEST OF EDGE OF SIDEWALK AND IS IN CORNER WHERE SIDEWALK
 HV2135'JOINS THE PAVED AREA TO CURB.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2177 ***********************************************************************
 HV2177  DESIGNATION -  NW 128 DCDHT
 HV2177  PID         -  HV2177
 HV2177  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2177  COUNTRY     -  US
 HV2177  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2177
 HV2177                         *CURRENT SURVEY CONTROL
 HV2177  ______________________________________________________________________
 HV2177* NAD 83(1993) POSITION- 38 58 11.91959(N) 077 01 07.87707(W)   ADJUSTED
 HV2177* NAVD 88 ORTHO HEIGHT -    75.477 (meters)      247.63  (feet) ADJUSTED
 HV2177  ______________________________________________________________________
 HV2177  GEOID HEIGHT    -        -31.999 (meters)                     GEOID18
 HV2177  LAPLACE CORR    -         -2.65  (seconds)                    DEFLEC18
 HV2177  DYNAMIC HEIGHT  -         75.437 (meters)      247.50  (feet) COMP
 HV2177  MODELED GRAVITY -    980,094.1   (mgal)                       NAVD 88
 HV2177
 HV2177  HORZ ORDER      -  SECOND
 HV2177  VERT ORDER      -  SECOND    CLASS 0
 HV2177
 HV2177.The horizontal coordinates were established by classical geodetic methods
 HV2177.and adjusted by the National Geodetic Survey in November 1994.
 HV2177
 HV2177.The orthometric height was determined by differential leveling and
 HV2177.adjusted by the NATIONAL GEODETIC SURVEY
 HV2177.in June 1991.
 HV2177
 HV2177.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2177.GEOID18 height accuracy estimate available here.
 HV2177
 HV2177.Click photographs - Photos may exist for this station.
 HV2177
 HV2177.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2177
 HV2177.The dynamic height is computed by dividing the NAVD 88
 HV2177.geopotential number by the normal gravity value computed on the
 HV2177.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2177.degrees latitude (g = 980.6199 gals.).
 HV2177
 HV2177.The modeled gravity was interpolated from observed gravity values.
 HV2177
 HV2177. The following values were computed from the NAD 83(1993) position.
 HV2177
 HV2177;                    North         East     Units Scale Factor Converg.
 HV2177;SPC MD       -   144,673.602   398,366.071   MT  0.99995119   -0 00 42.6
 HV2177;SPC MD       -   474,649.98  1,306,972.68   sFT  0.99995119   -0 00 42.6
 HV2177;SPC VA N     - 2,145,703.819 3,628,350.721   MT  0.99996726   +0 55 27.9
 HV2177;SPC VA N     - 7,039,696.61 11,904,013.99   sFT  0.99996726   +0 55 27.9
 HV2177;UTM  18      - 4,315,383.308   325,102.330   MT  0.99997667   -1 16 12.0
 HV2177
 HV2177!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2177!SPC MD       -   0.99999318  x   0.99995119  =   0.99994437
 HV2177!SPC VA N     -   0.99999318  x   0.99996726  =   0.99996044
 HV2177!UTM  18      -   0.99999318  x   0.99997667  =   0.99996985
 HV2177
 HV2177:                Primary Azimuth Mark                     Grid Az
 HV2177:SPC MD       -  HOME 1912 ECC                            167 47 43.9
 HV2177:SPC VA N     -  HOME 1912 ECC                            166 51 33.4
 HV2177:UTM  18      -  HOME 1912 ECC                            169 03 13.3
 HV2177
 HV2177_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2510215383(NAD 83)
 HV2177
 HV2177|---------------------------------------------------------------------|
 HV2177| PID    Reference Object                     Distance      Geod. Az  |
 HV2177|                                                           dddmmss.s |
 HV2177| HV4534 HOME 1912 ECC                       APPROX. 3.2 KM 1674701.3 |
 HV2177| HV4107 N W 128 A 1960                      228.636 METERS 27033     |
 HV2177|---------------------------------------------------------------------|
 HV2177
 HV2177                          SUPERSEDED SURVEY CONTROL
 HV2177
 HV2177  NAD 83(1991)-  38 58 11.91861(N)    077 01 07.87795(W) AD(       ) 2
 HV2177  NAD 83(1986)-  38 58 11.91800(N)    077 01 07.88767(W) AD(       ) 2
 HV2177  NAD 27      -  38 58 11.52450(N)    077 01 08.96740(W) AD(       ) 2
 HV2177  NGVD 29              75.71   (m)          248.4    (f) LEVELING    3  
 HV2177  NGVD 29 (11/26/84)   75.707  (m)          248.38   (f) ADJUSTED    2 0
 HV2177
 HV2177.Superseded values are not recommended for survey control.
 HV2177
 HV2177.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2177.See file dsdata.pdf to determine how the superseded data were derived.
 HV2177
 HV2177_MARKER: DD = SURVEY DISK
 HV2177_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2177_SP_SET: MONUMENT
 HV2177_STAMPING: USCGS NO NW 128
 HV2177_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2177_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV2177+SATELLITE: SATELLITE OBSERVATIONS - November 08, 2000
 HV2177
 HV2177  HISTORY     - Date     Condition        Report By
 HV2177  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2177  HISTORY     - 1960     GOOD             MADHOP
 HV2177  HISTORY     - 1966     GOOD             LOCENG
 HV2177  HISTORY     - 1971     GOOD             NGS
 HV2177  HISTORY     - 20001108 GOOD             DEWDAV
 HV2177
 HV2177                          STATION DESCRIPTION
 HV2177
 HV2177'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2177'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2177'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO NW 128 SET IN
 HV2177'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2177'COVER WITH LID LABELED SURVEY.
 HV2177
 HV2177                          STATION RECOVERY (1960)
 HV2177
 HV2177'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2177'IN WASHINGTON DC.
 HV2177'LOCATED ON VAN BUREN ST. N.W. IN FRONT OF BUILDING 413.  EAST
 HV2177'OF 5TH ST. 9.03 FT. SOUTHEAST OF SOUTHWEST CORNER OF BRICK WALL,
 HV2177'AND 8.66 FT. SOUTHWEST OF SOUTHEAST CORNER OF BRICK WALL ON WEST
 HV2177'SIDE OF STEPS.  SET ON EDGE OF SIDEWALK.  A STANDARD BRASS DISC
 HV2177'SET IN TOP OF A 12 IN. CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV2177'MANHOLE COVER WITH LID LABELED SURVEY.
 HV2177
 HV2177                          STATION RECOVERY (1966)
 HV2177
 HV2177'RECOVERY NOTE BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (WST)
 HV2177'RECOVERED BY DE LEUW CATHER CO.
 HV2177'
 HV2177'GOOD
 HV2177
 HV2177                          STATION RECOVERY (1971)
 HV2177
 HV2177'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2177'STATION AND REFERENCE POINTS RECOVERED IN GOOD CONDITION.  IT IS
 HV2177'ALSO 5.0 FEET NORTHEAST OF UTILITY POLE AND 4.8 FEET NORTH OF
 HV2177'FACE OF CURB.
 HV2177
 HV2177                          STATION RECOVERY (2000)
 HV2177
 HV2177'RECOVERY NOTE BY DEWBERRY DAVIS 2000 (CSW)
 HV2177'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2178 ***********************************************************************
 HV2178  DESIGNATION -  NW 129
 HV2178  PID         -  HV2178
 HV2178  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2178  COUNTRY     -  US
 HV2178  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2178
 HV2178                         *CURRENT SURVEY CONTROL
 HV2178  ______________________________________________________________________
 HV2178* NAD 83(1993) POSITION- 38 57 16.79094(N) 077 00 33.09854(W)   ADJUSTED
 HV2178* NAVD 88 ORTHO HEIGHT -    78.237 (meters)      256.68  (feet) ADJUSTED
 HV2178  ______________________________________________________________________
 HV2178  GEOID HEIGHT    -        -32.022 (meters)                     GEOID18
 HV2178  LAPLACE CORR    -         -2.64  (seconds)                    DEFLEC18
 HV2178  DYNAMIC HEIGHT  -         78.196 (meters)      256.55  (feet) COMP
 HV2178  MODELED GRAVITY -    980,102.9   (mgal)                       NAVD 88
 HV2178
 HV2178  HORZ ORDER      -  SECOND
 HV2178  VERT ORDER      -  SECOND    CLASS 0
 HV2178
 HV2178.The horizontal coordinates were established by classical geodetic methods
 HV2178.and adjusted by the National Geodetic Survey in November 1994.
 HV2178
 HV2178.The orthometric height was determined by differential leveling and
 HV2178.adjusted by the NATIONAL GEODETIC SURVEY
 HV2178.in June 1991.
 HV2178
 HV2178.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2178.GEOID18 height accuracy estimate available here.
 HV2178
 HV2178.Click photographs - Photos may exist for this station.
 HV2178
 HV2178.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2178
 HV2178.The dynamic height is computed by dividing the NAVD 88
 HV2178.geopotential number by the normal gravity value computed on the
 HV2178.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2178.degrees latitude (g = 980.6199 gals.).
 HV2178
 HV2178.The modeled gravity was interpolated from observed gravity values.
 HV2178
 HV2178. The following values were computed from the NAD 83(1993) position.
 HV2178
 HV2178;                    North         East     Units Scale Factor Converg.
 HV2178;SPC MD       -   142,973.531   399,203.085   MT  0.99995079   -0 00 20.8
 HV2178;SPC MD       -   469,072.33  1,309,718.79   sFT  0.99995079   -0 00 20.8
 HV2178;SPC VA N     - 2,144,017.625 3,629,215.414   MT  0.99996566   +0 55 49.6
 HV2178;SPC VA N     - 7,034,164.49 11,906,850.90   sFT  0.99996566   +0 55 49.6
 HV2178;UTM  18      - 4,313,665.230   325,901.838   MT  0.99997324   -1 15 48.6
 HV2178
 HV2178!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2178!SPC MD       -   0.99999275  x   0.99995079  =   0.99994354
 HV2178!SPC VA N     -   0.99999275  x   0.99996566  =   0.99995841
 HV2178!UTM  18      -   0.99999275  x   0.99997324  =   0.99996599
 HV2178
 HV2178:                Primary Azimuth Mark                     Grid Az
 HV2178:SPC MD       -  NW 129 AZ MK                             228 10 57.5
 HV2178:SPC VA N     -  NW 129 AZ MK                             227 14 47.1
 HV2178:UTM  18      -  NW 129 AZ MK                             229 26 25.3
 HV2178
 HV2178_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2590113665(NAD 83)
 HV2178
 HV2178|---------------------------------------------------------------------|
 HV2178| PID    Reference Object                     Distance      Geod. Az  |
 HV2178|                                                           dddmmss.s |
 HV2178| HV4163 N E 129 E 1960                      284.018 METERS 07414     |
 HV2178| HV4149 N W 129 A 1960                      244.499 METERS 17915     |
 HV2178| DC6947 NW 129 AZ MK                                       2281036.7 |
 HV2178|---------------------------------------------------------------------|
 HV2178
 HV2178                          SUPERSEDED SURVEY CONTROL
 HV2178
 HV2178  NAD 83(1991)-  38 57 16.78993(N)    077 00 33.09949(W) AD(       ) 2
 HV2178  NAD 83(1986)-  38 57 16.78918(N)    077 00 33.10941(W) AD(       ) 2
 HV2178  NAD 27      -  38 57 16.39740(N)    077 00 34.18790(W) AD(       ) 2
 HV2178  NGVD 29              78.47   (m)          257.4    (f) LEVELING    3  
 HV2178  NGVD 29 (11/26/84)   78.467  (m)          257.44   (f) ADJUSTED    2 0
 HV2178
 HV2178.Superseded values are not recommended for survey control.
 HV2178
 HV2178.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2178.See file dsdata.pdf to determine how the superseded data were derived.
 HV2178
 HV2178_MARKER: DD = SURVEY DISK
 HV2178_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2178_SP_SET: MONUMENT
 HV2178_STAMPING: USCGS NO NW 129
 HV2178_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2178
 HV2178  HISTORY     - Date     Condition        Report By
 HV2178  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2178  HISTORY     - 1960     GOOD             MADHOP
 HV2178  HISTORY     - 1971     GOOD             NGS
 HV2178
 HV2178                          STATION DESCRIPTION
 HV2178
 HV2178'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2178'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2178'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. N.W. 129 SET IN
 HV2178'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2178'COVER WITH LID LABELED SURVEY.
 HV2178
 HV2178                          STATION RECOVERY (1960)
 HV2178
 HV2178'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2178'IN WASHINGTON DC.
 HV2178'AT THE INTERSECTION OF NORTH CAPITOL ST., RIGGS RD, MISSOURI
 HV2178'AVE. N.W., AND INGRAHAM ST. N.W., 23.95 FT. SOUTHWEST OF CROSS
 HV2178'CUT IN RIM OF MANHOLE ADJACENT TO MISSOURI AVE, AND 31.10 FT.
 HV2178'NORTHWEST OF CROSS CUT IN RIM OF MANHOLE IN ROADWAY OF INGRAHAM
 HV2178'ST., AND 14.97 FT. NORTHEAST OF CROSS CUT IN RIM OF MANHOLE IN
 HV2178'ROADWAY OF INGRAHAM ST.  A STANDARD BRASS DISC SET IN TOP OF
 HV2178'12 IN. CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER
 HV2178'WITH LID LABELED SURVEY.
 HV2178
 HV2178                          STATION RECOVERY (1971)
 HV2178
 HV2178'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2178'THE STATION AND ALL REFERENCE POINTS RECOVERED AS DESCRIBED AND
 HV2178'IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4152 ***********************************************************************
 HV4152  DESIGNATION -  NW 132
 HV4152  PID         -  HV4152
 HV4152  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4152  COUNTRY     -  US
 HV4152  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4152
 HV4152                         *CURRENT SURVEY CONTROL
 HV4152  ______________________________________________________________________
 HV4152* NAD 83(1993) POSITION- 38 55 00.34262(N) 077 00 32.11553(W)   ADJUSTED
 HV4152* NAVD 88 ORTHO HEIGHT -    35.90  (+/-2cm)      117.8   (feet) VERTCON3
 HV4152  ______________________________________________________________________
 HV4152  GEOID HEIGHT    -        -32.072 (meters)                     GEOID18
 HV4152  LAPLACE CORR    -         -3.19  (seconds)                    DEFLEC18
 HV4152  HORZ ORDER      -  SECOND
 HV4152  VERT ORDER      -  THIRD ? (See Below)
 HV4152
 HV4152.The horizontal coordinates were established by classical geodetic methods
 HV4152.and adjusted by the National Geodetic Survey in November 1994.
 HV4152
 HV4152.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4152.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4152
 HV4152.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4152.GEOID18 height accuracy estimate available here.
 HV4152
 HV4152.The vertical order pertains to the NGVD 29 superseded value.
 HV4152
 HV4152.Click photographs - Photos may exist for this station.
 HV4152
 HV4152.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4152
 HV4152. The following values were computed from the NAD 83(1993) position.
 HV4152
 HV4152;                    North         East     Units Scale Factor Converg.
 HV4152;SPC MD       -   138,766.040   399,226.342   MT  0.99995010   -0 00 20.2
 HV4152;SPC MD       -   455,268.25  1,309,795.09   sFT  0.99995010   -0 00 20.2
 HV4152;SPC VA N     - 2,139,811.020 3,629,307.416   MT  0.99996199   +0 55 50.2
 HV4152;SPC VA N     - 7,020,363.32 11,907,152.75   sFT  0.99996199   +0 55 50.2
 HV4152;UTM  18      - 4,309,458.145   325,832.772   MT  0.99997354   -1 15 44.3
 HV4152
 HV4152!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4152!SPC MD       -   0.99999940  x   0.99995010  =   0.99994950
 HV4152!SPC VA N     -   0.99999940  x   0.99996199  =   0.99996139
 HV4152!UTM  18      -   0.99999940  x   0.99997354  =   0.99997294
 HV4152
 HV4152:                Primary Azimuth Mark                     Grid Az
 HV4152:SPC MD       -  NE 131 B                                 000 00 10.6
 HV4152:SPC VA N     -  NE 131 B                                 359 04 00.2
 HV4152:UTM  18      -  NE 131 B                                 001 15 34.7
 HV4152
 HV4152_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2583209458(NAD 83)
 HV4152
 HV4152|---------------------------------------------------------------------|
 HV4152| PID    Reference Object                     Distance      Geod. Az  |
 HV4152|                                                           dddmmss.s |
 HV4152| DC6948 NW 132 RM 1                          11.610 METERS 11656     |
 HV4152| DC6949 NW 132 RM 2                          11.598 METERS 13822     |
 HV4152| HV4151 N E 132 A 1960                      384.294 METERS 18005     |
 HV4152| HV2182 NE 131 B                            495.965 METERS 3595950.4 |
 HV4152|---------------------------------------------------------------------|
 HV4152
 HV4152                          SUPERSEDED SURVEY CONTROL
 HV4152
 HV4152  NAD 83(1991)-  38 55 00.34153(N)    077 00 32.11664(W) AD(       ) 2
 HV4152  NAD 83(1986)-  38 55 00.34068(N)    077 00 32.12713(W) AD(       ) 2
 HV4152  NAD 27      -  38 54 59.94140(N)    077 00 33.20880(W) AD(       ) 2
 HV4152  NGVD 29              36.13   (m)          118.5    (f) LEVELING    3  
 HV4152
 HV4152.Superseded values are not recommended for survey control.
 HV4152
 HV4152.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4152.See file dsdata.pdf to determine how the superseded data were derived.
 HV4152
 HV4152_MARKER: DS = TRIANGULATION STATION DISK
 HV4152_SETTING: 0 = UNSPECIFIED SETTING
 HV4152
 HV4152  HISTORY     - Date     Condition        Report By
 HV4152  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4152  HISTORY     - 1960     GOOD             CGS
 HV4152  HISTORY     - 1964     SEE DESCRIPTION  CGS
 HV4152  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4152
 HV4152                          STATION DESCRIPTION
 HV4152
 HV4152'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4152'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4152'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO N.W. 132 IN TOP
 HV4152'OF CURB.
 HV4152'
 HV4152'NOTE - TO BE RESET.
 HV4152
 HV4152                          STATION RECOVERY (1960)
 HV4152
 HV4152'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960 (CEO)
 HV4152'MARK TO BE DESTROYED BY THE NORTH CAPITOL STREET - RHODE ISLAND
 HV4152'AVENUE OVERPASS.  REPLACEMENT MARK TO BE SET ON THE TOP OF THE
 HV4152'OVERPASS WHEN COMPLETED.  REFERENCE MEASUREMENTS HAVE BEEN MADE
 HV4152'SO THAT BOTH HORIZONTAL AND VERTICAL DETERMINATIONS CAN BE MADE
 HV4152'TO THE NEW MARK.
 HV4152
 HV4152                          STATION RECOVERY (1964)
 HV4152
 HV4152'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1964 (CEO)
 HV4152'REFERENCED IN MARCH 1962 FOR RESETTING AFTER CONSTRUCTION OF THE
 HV4152'RHODE ISLAND AVENUE OVERPASS AT NORTH CAPITOL STREET.  THREE
 HV4152'REFERENCE POINTS WERE ESTABLISHED.  TEMPORARY REFERENCE POINT
 HV4152'NUMBER 3 WAS DESTROYED SOON AFTER THE OBSERVATIONS WERE COMPLETED.
 HV4152'
 HV4152'IN 1964 WHEN CONSTRUCTION WAS COMPLETED AND THE STATION WAS TO BE
 HV4152'RESET, TEMPORARY REFERENCE POINT NUMBER 2 WAS NOT FOUND IS PRESUMED
 HV4152'DESTROYED.  TEMPORARY REFERENCE POINT NUMBER 1 COULD NOT BE
 HV4152'MEASURED TO WITHOUT DIFFICULTY AND THEREFORE NOT USED IN MAKING
 HV4152'HORIZONTAL MEASUREMENTS.
 HV4152'
 HV4152'THE ORIGINAL REFERENCES WERE NOT FOUND.
 HV4152'
 HV4152'A NEW STATION NW 132 RESET 1964 WAS ESTABLISHED BY OBSERVATIONS
 HV4152'TO NW 133 RESET, ST. MATTHEWS CATHEDRAL AND HEAD ON CAPITOL DOME.
 HV4152
 HV4152                          STATION RECOVERY (1971)
 HV4152
 HV4152'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4152'STATION DESTROYED BY CONSTRUCTION OF ROAD OVERPASS.  NOTE--THIS
 HV4152'STATION WAS TO HAVE BEEN RESET, ACCORDING TO NOTE IN ORIGINAL
 HV4152'DESCRIPTION, HOWEVER NO MARK COULD BE FOUND IN THIS AREA.
 HV4152'
 HV4152'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4152'IN DISTRICT OF COLUMBIA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2183 ***********************************************************************
 HV2183  DESIGNATION -  NW 132 DCDHT RESET 1964
 HV2183  PID         -  HV2183
 HV2183  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2183  COUNTRY     -  US
 HV2183  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2183
 HV2183                         *CURRENT SURVEY CONTROL
 HV2183  ______________________________________________________________________
 HV2183* NAD 83(1986) POSITION- 38 55 00.     (N) 077 00 33.     (W)   SCALED
 HV2183* NAVD 88 ORTHO HEIGHT -    35.79  (+/-2cm)      117.4   (feet) VERTCON3
 HV2183  ______________________________________________________________________
 HV2183  GEOID HEIGHT    -        -32.072 (meters)                     GEOID18
 HV2183  VERT ORDER      -  THIRD (See Below)
 HV2183
 HV2183.The horizontal coordinates were scaled from a map and have
 HV2183.an estimated accuracy of +/- 6 seconds.
 HV2183
 HV2183.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV2183.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV2183
 HV2183.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2183.GEOID18 height accuracy estimate available here.
 HV2183
 HV2183.The vertical order pertains to the NGVD 29 superseded value.
 HV2183
 HV2183.Click photographs - Photos may exist for this station.
 HV2183
 HV2183
 HV2183_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ258094(NAD 83)
 HV2183
 HV2183                          SUPERSEDED SURVEY CONTROL
 HV2183
 HV2183  NGVD 29 (??/??/??)   36.02   (m)          118.2    (f) RESET       3  
 HV2183
 HV2183.Superseded values are not recommended for survey control.
 HV2183
 HV2183.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2183.See file dsdata.pdf to determine how the superseded data were derived.
 HV2183
 HV2183_MARKER: DD = SURVEY DISK
 HV2183_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV2183_SP_SET: OVERPASS
 HV2183_STAMPING: NW 132 RESET 1964
 HV2183_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV2183
 HV2183  HISTORY     - Date     Condition        Report By
 HV2183  HISTORY     - 1964     MONUMENTED       MADHOP
 HV2183
 HV2183                          STATION DESCRIPTION
 HV2183
 HV2183'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1964
 HV2183'AT WASHINGTON DC.
 HV2183'AT WASHINGTON, D.C., AT THE INTERSECTION OF NORTH CAPITAL
 HV2183'STREET AND RHODE ISLAND AVENUE NORTHEAST, 3.8 FEET NORTH OF A
 HV2183'D.C. DEPT. OF HIGHWAYS DISK, 2.4 FEET SOUTHWEST OF A METAL
 HV2183'TRAFFIC LIGHT POST, 1.9 FEET SOUTH OF A CURB, AND SET IN THE TOP OF
 HV2183'THE SIDEWALK OF THE OVERPASS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1888 ***********************************************************************
 HV1888  DESIGNATION -  NW 14
 HV1888  PID         -  HV1888
 HV1888  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1888  COUNTRY     -  US
 HV1888  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1888
 HV1888                         *CURRENT SURVEY CONTROL
 HV1888  ______________________________________________________________________
 HV1888* NAD 83(1986) POSITION- 38 55 43.2    (N) 077 02 09.4    (W)   HD_HELD2
 HV1888* NAVD 88 ORTHO HEIGHT -    60.921 (meters)      199.87  (feet) ADJUSTED
 HV1888  ______________________________________________________________________
 HV1888  GEOID HEIGHT    -        -32.017 (meters)                     GEOID18
 HV1888  DYNAMIC HEIGHT  -         60.888 (meters)      199.76  (feet) COMP
 HV1888  MODELED GRAVITY -    980,096.0   (mgal)                       NAVD 88
 HV1888
 HV1888  VERT ORDER      -  FIRST     CLASS II
 HV1888
 HV1888.The horizontal coordinates were established by autonomous hand held GPS
 HV1888.observations and have an estimated accuracy of +/- 10 meters.
 HV1888
 HV1888.The orthometric height was determined by differential leveling and
 HV1888.adjusted by the NATIONAL GEODETIC SURVEY
 HV1888.in June 1991.
 HV1888
 HV1888.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1888.GEOID18 height accuracy estimate available here.
 HV1888
 HV1888.Click photographs - Photos may exist for this station.
 HV1888
 HV1888.The dynamic height is computed by dividing the NAVD 88
 HV1888.geopotential number by the normal gravity value computed on the
 HV1888.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1888.degrees latitude (g = 980.6199 gals.).
 HV1888
 HV1888.The modeled gravity was interpolated from observed gravity values.
 HV1888
 HV1888
 HV1888_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2351910831(NAD 83)
 HV1888
 HV1888                          SUPERSEDED SURVEY CONTROL
 HV1888
 HV1888  NGVD 29 (11/26/84)   61.154  (m)          200.64   (f) ADJUSTED    1 2
 HV1888
 HV1888.Superseded values are not recommended for survey control.
 HV1888
 HV1888.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1888.See file dsdata.pdf to determine how the superseded data were derived.
 HV1888
 HV1888_MARKER: DB = BENCH MARK DISK
 HV1888_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1888_SP_SET: FOUNDATION
 HV1888_STAMPING: NW 14
 HV1888_MARK LOGO: PBPP
 HV1888_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1888_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1888+SATELLITE: SATELLITE OBSERVATIONS - August 18, 2002
 HV1888
 HV1888  HISTORY     - Date     Condition        Report By
 HV1888  HISTORY     - UNK      MONUMENTED       PBPP
 HV1888  HISTORY     - 1926     GOOD             PBPP
 HV1888  HISTORY     - 1960     GOOD             CGS
 HV1888  HISTORY     - 20020818 GOOD             INDIV
 HV1888  HISTORY     - 20111113 GOOD             NGS
 HV1888
 HV1888                          STATION DESCRIPTION
 HV1888
 HV1888'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1888'AT WASHINGTON.
 HV1888'AT WASHINGTON, ON SIXTEENTH STREET NORTHWEST, AT THE INTERSECTION
 HV1888'OF IRVING STREET, 100 FEET EAST OF THE CENTERLINE OF SIXTEENTH
 HV1888'STREET, AT THE CENTRAL PRESBYTERIAN CHURCH, IN THE FACE OF THE
 HV1888'NORTH FOUNDATION, 15 INCHES EAST OF THE NORTHWEST CORNER OF THE
 HV1888'CHURCH, AND 8 INCHES ABOVE THE GROUND.  A PUBLIC BUILDINGS AND
 HV1888'PUBLIC PARKS STANDARD DISK, STAMPED NW 14 AND SET VERTICALLY.
 HV1888
 HV1888                          STATION RECOVERY (1960)
 HV1888
 HV1888'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1888'RECOVERED IN GOOD CONDITION.
 HV1888
 HV1888                          STATION RECOVERY (2002)
 HV1888
 HV1888'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 HV1888'CHURCH BUILDING HAS BEEN LARGELY GUTTED AND APPEARS SLATED FOR
 HV1888'RENOVATION OR RESTORATION. AREA OF FACADE AROUND STATION IS CURRENTLY
 HV1888'INTACT AND APPEARS UNAFFECTED BY WORK SO FAR.
 HV1888
 HV1888                          STATION RECOVERY (2011)
 HV1888
 HV1888'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2011 (DRD)
 HV1888'THE BUILDING IS NOW THE CAPITAL CITY PUBLIC CHARTER SCHOOL LOCATED AT
 HV1888'3047 15TH ST. NORTHWEST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1889 ***********************************************************************
 HV1889  DESIGNATION -  NW 15=SACRED HEART
 HV1889  PID         -  HV1889
 HV1889  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1889  COUNTRY     -  US
 HV1889  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1889
 HV1889                         *CURRENT SURVEY CONTROL
 HV1889  ______________________________________________________________________
 HV1889* NAD 83(1986) POSITION- 38 55 52.     (N) 077 02 09.     (W)   SCALED
 HV1889* NAVD 88 ORTHO HEIGHT -    60.833 (meters)      199.58  (feet) ADJUSTED
 HV1889  ______________________________________________________________________
 HV1889  GEOID HEIGHT    -        -32.014 (meters)                     GEOID18
 HV1889  DYNAMIC HEIGHT  -         60.801 (meters)      199.48  (feet) COMP
 HV1889  MODELED GRAVITY -    980,095.6   (mgal)                       NAVD 88
 HV1889
 HV1889  VERT ORDER      -  FIRST     CLASS II
 HV1889
 HV1889.The horizontal coordinates were scaled from a map and have
 HV1889.an estimated accuracy of +/- 6 seconds.
 HV1889
 HV1889.The orthometric height was determined by differential leveling and
 HV1889.adjusted by the NATIONAL GEODETIC SURVEY
 HV1889.in June 1991.
 HV1889
 HV1889.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1889.GEOID18 height accuracy estimate available here.
 HV1889
 HV1889.Click photographs - Photos may exist for this station.
 HV1889
 HV1889.The dynamic height is computed by dividing the NAVD 88
 HV1889.geopotential number by the normal gravity value computed on the
 HV1889.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1889.degrees latitude (g = 980.6199 gals.).
 HV1889
 HV1889.The modeled gravity was interpolated from observed gravity values.
 HV1889
 HV1889
 HV1889_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ235111(NAD 83)
 HV1889
 HV1889                          SUPERSEDED SURVEY CONTROL
 HV1889
 HV1889  NGVD 29 (11/26/84)   61.066  (m)          200.35   (f) ADJUSTED    1 2
 HV1889
 HV1889.Superseded values are not recommended for survey control.
 HV1889
 HV1889.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1889.See file dsdata.pdf to determine how the superseded data were derived.
 HV1889
 HV1889_MARKER: B = BOLT
 HV1889_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1889_SP_SET: BUILDING
 HV1889_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1889
 HV1889  HISTORY     - Date     Condition        Report By
 HV1889  HISTORY     - UNK      MONUMENTED       PBPP
 HV1889  HISTORY     - 1926     GOOD             PBPP
 HV1889  HISTORY     - 1960     GOOD             CGS
 HV1889
 HV1889                          STATION DESCRIPTION
 HV1889
 HV1889'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1889'AT WASHINGTON.
 HV1889'AT WASHINGTON, ON SIXTEENTH STREET NORTHWEST, AT THE INTERSECTION
 HV1889'OF PARK ROAD NORTHWEST, 100 FEET EAST OF THE CENTERLINE OF
 HV1889'SIXTEENTH STREET, 25 FEET SOUTH OF THE SOUTH CURB OF PARK ROAD,
 HV1889'AT THE SACRED HEART CATHOLIC CHURCH, AT THE SOUTHWEST CORNER
 HV1889'OF THE STEPS, IN THE NORTH CONCRETE WALL, 1 FOOT EAST OF THE
 HV1889'OUTER EDGE OF THE WALL, AND 1 FOOT WEST OF A HEDGE.  A BRASS
 HV1889'PLUG.  NOTE-- THE MARK LOOKS LIKE AN IRON-PIPE CAP ABOUT 1 INCH
 HV1889'IN DIAMETER.
 HV1889
 HV1889                          STATION RECOVERY (1960)
 HV1889
 HV1889'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1889'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1890 ***********************************************************************
 HV1890  DESIGNATION -  NW 16
 HV1890  PID         -  HV1890
 HV1890  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1890  COUNTRY     -  US
 HV1890  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1890
 HV1890                         *CURRENT SURVEY CONTROL
 HV1890  ______________________________________________________________________
 HV1890* NAD 83(1986) POSITION- 38 56 18.7    (N) 077 02 11.0    (W)   HD_HELD2
 HV1890* NAVD 88 ORTHO HEIGHT -    47.431 (meters)      155.61  (feet) ADJUSTED
 HV1890  ______________________________________________________________________
 HV1890  GEOID HEIGHT    -        -32.006 (meters)                     GEOID18
 HV1890  DYNAMIC HEIGHT  -         47.406 (meters)      155.53  (feet) COMP
 HV1890  MODELED GRAVITY -    980,094.4   (mgal)                       NAVD 88
 HV1890
 HV1890  VERT ORDER      -  FIRST     CLASS II
 HV1890
 HV1890.The horizontal coordinates were established by autonomous hand held GPS
 HV1890.observations and have an estimated accuracy of +/- 10 meters.
 HV1890
 HV1890.The orthometric height was determined by differential leveling and
 HV1890.adjusted by the NATIONAL GEODETIC SURVEY
 HV1890.in June 1991.
 HV1890
 HV1890.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1890.GEOID18 height accuracy estimate available here.
 HV1890
 HV1890.Click photographs - Photos may exist for this station.
 HV1890
 HV1890.The dynamic height is computed by dividing the NAVD 88
 HV1890.geopotential number by the normal gravity value computed on the
 HV1890.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1890.degrees latitude (g = 980.6199 gals.).
 HV1890
 HV1890.The modeled gravity was interpolated from observed gravity values.
 HV1890
 HV1890
 HV1890_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2350511926(NAD 83)
 HV1890
 HV1890                          SUPERSEDED SURVEY CONTROL
 HV1890
 HV1890  NGVD 29 (11/26/84)   47.663  (m)          156.37   (f) ADJUSTED    1 2
 HV1890
 HV1890.Superseded values are not recommended for survey control.
 HV1890
 HV1890.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1890.See file dsdata.pdf to determine how the superseded data were derived.
 HV1890
 HV1890_MARKER: DB = BENCH MARK DISK
 HV1890_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1890_SP_SET: BRIDGE
 HV1890_STAMPING: NW 16
 HV1890_MARK LOGO: PBPP
 HV1890_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1890_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1890+SATELLITE: SATELLITE OBSERVATIONS - November 12, 2011
 HV1890
 HV1890  HISTORY     - Date     Condition        Report By
 HV1890  HISTORY     - UNK      MONUMENTED       PBPP
 HV1890  HISTORY     - 1926     GOOD             PBPP
 HV1890  HISTORY     - 1960     GOOD             CGS
 HV1890  HISTORY     - 20020818 GOOD             INDIV
 HV1890  HISTORY     - 20111112 GOOD             NGS
 HV1890
 HV1890                          STATION DESCRIPTION
 HV1890
 HV1890'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1890'AT WASHINGTON.
 HV1890'AT WASHINGTON, ON SIXTEENTH STREET NORTHWEST, AT THE NORTH END
 HV1890'OF THE BRIDGE OVER PINEY BRANCH PARKWAY, IN THE NORTH FACE OF THE
 HV1890'CONCRETE BASE OF THE BRONZE LION, 7 INCHES EAST OF THE NORTHWEST
 HV1890'CORNER, AND 6 INCHES ABOVE THE SIDEWALK.  A PUBLIC BUILDINGS
 HV1890'AND PUBLIC PARKS STANDARD DISK, STAMPED NW 16 AND SET VERTICALLY.
 HV1890
 HV1890                          STATION RECOVERY (1960)
 HV1890
 HV1890'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1890'RECOVERED IN GOOD CONDITION.
 HV1890
 HV1890                          STATION RECOVERY (2002)
 HV1890
 HV1890'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 HV1890'RECOVERED IN GOOD CONDITION.
 HV1890
 HV1890                          STATION RECOVERY (2011)
 HV1890
 HV1890'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2011 (DRD)
 HV1890'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1891 ***********************************************************************
 HV1891  DESIGNATION -  NW 17
 HV1891  PID         -  HV1891
 HV1891  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1891  COUNTRY     -  US
 HV1891  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1891
 HV1891                         *CURRENT SURVEY CONTROL
 HV1891  ______________________________________________________________________
 HV1891* NAD 83(1986) POSITION- 38 56 43.     (N) 077 02 10.     (W)   SCALED
 HV1891* NAVD 88 ORTHO HEIGHT -    67.255 (meters)      220.65  (feet) ADJUSTED
 HV1891  ______________________________________________________________________
 HV1891  GEOID HEIGHT    -        -32.000 (meters)                     GEOID18
 HV1891  DYNAMIC HEIGHT  -         67.219 (meters)      220.53  (feet) COMP
 HV1891  MODELED GRAVITY -    980,093.5   (mgal)                       NAVD 88
 HV1891
 HV1891  VERT ORDER      -  FIRST     CLASS II
 HV1891
 HV1891.The horizontal coordinates were scaled from a map and have
 HV1891.an estimated accuracy of +/- 6 seconds.
 HV1891
 HV1891.The orthometric height was determined by differential leveling and
 HV1891.adjusted by the NATIONAL GEODETIC SURVEY
 HV1891.in June 1991.
 HV1891
 HV1891.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1891.GEOID18 height accuracy estimate available here.
 HV1891
 HV1891.Click photographs - Photos may exist for this station.
 HV1891
 HV1891.The dynamic height is computed by dividing the NAVD 88
 HV1891.geopotential number by the normal gravity value computed on the
 HV1891.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1891.degrees latitude (g = 980.6199 gals.).
 HV1891
 HV1891.The modeled gravity was interpolated from observed gravity values.
 HV1891
 HV1891
 HV1891_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ235126(NAD 83)
 HV1891
 HV1891                          SUPERSEDED SURVEY CONTROL
 HV1891
 HV1891  NGVD 29 (11/26/84)   67.485  (m)          221.41   (f) ADJUSTED    1 2
 HV1891
 HV1891.Superseded values are not recommended for survey control.
 HV1891
 HV1891.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1891.See file dsdata.pdf to determine how the superseded data were derived.
 HV1891
 HV1891_MARKER: DD = SURVEY DISK
 HV1891_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1891_SP_SET: BUILDING
 HV1891_STAMPING: NW 17
 HV1891_MARK LOGO: PBPP
 HV1891_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1891
 HV1891  HISTORY     - Date     Condition        Report By
 HV1891  HISTORY     - UNK      MONUMENTED       PBPP
 HV1891  HISTORY     - 1926     GOOD             PBPP
 HV1891  HISTORY     - 1960     GOOD             CGS
 HV1891
 HV1891                          STATION DESCRIPTION
 HV1891
 HV1891'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1891'AT WASHINGTON.
 HV1891'AT WASHINGTON, ON SIXTEENTH STREET NORTHWEST, AT THE INTERSECTION
 HV1891'OF ALLISON STREET NORTHWEST, AT THE HAMLINE METHODIST CHURCH,
 HV1891'IN THE NORTH WALL, 12 FEET EAST OF THE NORTHWEST CORNER OF THE
 HV1891'BUILDING, 2 FEET WEST OF A BASEMENT WINDOW, AND 4.5 INCHES
 HV1891'EAST OF A CONCRETE AREA WALL.  A PUBLIC BUILDINGS AND PUBLIC
 HV1891'PARKS STANDARD DISK, STAMPED NW 17 AND SET VERTICALLY.
 HV1891
 HV1891                          STATION RECOVERY (1960)
 HV1891
 HV1891'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1891'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1892 ***********************************************************************
 HV1892  DESIGNATION -  NW 19
 HV1892  PID         -  HV1892
 HV1892  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1892  COUNTRY     -  US
 HV1892  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1892
 HV1892                         *CURRENT SURVEY CONTROL
 HV1892  ______________________________________________________________________
 HV1892* NAD 83(1986) POSITION- 38 57 46.     (N) 077 02 11.     (W)   SCALED
 HV1892* NAVD 88 ORTHO HEIGHT -    69.92  (+/-2cm)      229.4   (feet) VERTCON3
 HV1892  ______________________________________________________________________
 HV1892  GEOID HEIGHT    -        -31.982 (meters)                     GEOID18
 HV1892  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1892
 HV1892.The horizontal coordinates were scaled from a map and have
 HV1892.an estimated accuracy of +/- 6 seconds.
 HV1892
 HV1892.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1892.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1892
 HV1892.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1892.GEOID18 height accuracy estimate available here.
 HV1892
 HV1892.The vertical order pertains to the NGVD 29 superseded value.
 HV1892
 HV1892.Click photographs - Photos may exist for this station.
 HV1892
 HV1892
 HV1892_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ235146(NAD 83)
 HV1892
 HV1892                          SUPERSEDED SURVEY CONTROL
 HV1892
 HV1892  NGVD 29 (11/26/84)   70.141  (m)          230.12   (f) ADJUSTED    1 2
 HV1892
 HV1892.Superseded values are not recommended for survey control.
 HV1892
 HV1892.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1892.See file dsdata.pdf to determine how the superseded data were derived.
 HV1892
 HV1892_MARKER: DD = SURVEY DISK
 HV1892_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1892_SP_SET: BRIDGE
 HV1892_STAMPING: NW 19
 HV1892_MARK LOGO: PBPP
 HV1892_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1892
 HV1892  HISTORY     - Date     Condition        Report By
 HV1892  HISTORY     - UNK      MONUMENTED       PBPP
 HV1892  HISTORY     - 1926     GOOD             PBPP
 HV1892  HISTORY     - 1943     GOOD             CGS
 HV1892
 HV1892                          STATION DESCRIPTION
 HV1892
 HV1892'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1892'AT WASHINGTON.
 HV1892'AT WASHINGTON, ON SIXTEENTH STREET NORTHWEST, AT THE BRIDGE OVER
 HV1892'MILITARY ROAD, IN THE TOP OF THE NORTHEAST WING WALL, AND 4
 HV1892'INCHES NORTHEAST OF THE END OF THE RAIL ON TOP OF THE WALL.
 HV1892'A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED
 HV1892'NW 19.
 HV1892
 HV1892                          STATION RECOVERY (1943)
 HV1892
 HV1892'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943
 HV1892'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1861 ***********************************************************************
 HV1861  DESIGNATION -  NW 1=NATL ACAD OF SCI
 HV1861  PID         -  HV1861
 HV1861  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1861  COUNTRY     -  US
 HV1861  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1861
 HV1861                         *CURRENT SURVEY CONTROL
 HV1861  ______________________________________________________________________
 HV1861* NAD 83(1986) POSITION- 38 53 33.9    (N) 077 02 51.8    (W)   HD_HELD2
 HV1861* NAVD 88 ORTHO HEIGHT -     8.79  (+/-2cm)       28.8   (feet) VERTCON3
 HV1861  ______________________________________________________________________
 HV1861  GEOID HEIGHT    -        -32.066 (meters)                     GEOID18
 HV1861  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1861
 HV1861.The horizontal coordinates were established by autonomous hand held GPS
 HV1861.observations and have an estimated accuracy of +/- 10 meters.
 HV1861
 HV1861.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1861.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1861
 HV1861.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1861.GEOID18 height accuracy estimate available here.
 HV1861
 HV1861.The vertical order pertains to the NGVD 29 superseded value.
 HV1861
 HV1861.Click photographs - Photos may exist for this station.
 HV1861
 HV1861
 HV1861_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2240806868(NAD 83)
 HV1861
 HV1861                          SUPERSEDED SURVEY CONTROL
 HV1861
 HV1861  NGVD 29 (11/26/84)    9.027  (m)           29.62   (f) ADJUSTED    1 2
 HV1861
 HV1861.Superseded values are not recommended for survey control.
 HV1861
 HV1861.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1861.See file dsdata.pdf to determine how the superseded data were derived.
 HV1861
 HV1861_MARKER: Z = SEE DESCRIPTION
 HV1861_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1861_SP_SET: STEP
 HV1861_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1861
 HV1861  HISTORY     - Date     Condition        Report By
 HV1861  HISTORY     - UNK      MONUMENTED       PBPP
 HV1861  HISTORY     - 1926     GOOD             CGS
 HV1861  HISTORY     - 1948     GOOD             CGS
 HV1861
 HV1861                          STATION DESCRIPTION
 HV1861
 HV1861'DESCRIBED BY COAST AND GEODETIC SURVEY 1926
 HV1861'AT WASHINGTON.
 HV1861'AT WASHINGTON, ON CONSTITUTION AVENUE BETWEEN TWENTY-SECOND AND
 HV1861'TWENTY-THIRD STREETS NORTHWEST, AT THE NATIONAL ACADEMY OF
 HV1861'SCIENCES, AT THE SECOND FLIGHT OF STEPS AT THE FRONT ENTRANCE, ON
 HV1861'THE TOP OF THE SECOND STEP FROM THE BOTTOM, 3 FEET WEST OF THE
 HV1861'EAST MARBLE SIDE WALL, 1/2 INCH EAST OF THE FIRST MORTAR JOINT
 HV1861'OF THE SIDE WALL, AND 1/4 INCH NORTH OF THE EDGE OF THE STEP.  AN
 HV1861'UNMARKED POINT.  NOTE-- THE ONLY POINT TO SATISFY THE DESCRIPTION
 HV1861'IS ON THE SECOND SET OF STEPS SOUTH OF THE BUILDING WHICH ARE
 HV1861'BETWEEN THE TWO ENTRANCE LAMPPOSTS.
 HV1861
 HV1861                          STATION RECOVERY (1948)
 HV1861
 HV1861'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1948
 HV1861'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1893 ***********************************************************************
 HV1893  DESIGNATION -  NW 20
 HV1893  PID         -  HV1893
 HV1893  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1893  COUNTRY     -  US
 HV1893  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1893
 HV1893                         *CURRENT SURVEY CONTROL
 HV1893  ______________________________________________________________________
 HV1893* NAD 83(1986) POSITION- 38 58 23.67   (N) 077 02 09.64   (W)   HD_HELD1
 HV1893* NAVD 88 ORTHO HEIGHT -    82.957 (meters)      272.17  (feet) ADJUSTED
 HV1893  ______________________________________________________________________
 HV1893  GEOID HEIGHT    -        -31.974 (meters)                     GEOID18
 HV1893  DYNAMIC HEIGHT  -         82.913 (meters)      272.02  (feet) COMP
 HV1893  MODELED GRAVITY -    980,088.8   (mgal)                       NAVD 88
 HV1893
 HV1893  VERT ORDER      -  FIRST     CLASS II
 HV1893
 HV1893.The horizontal coordinates were determined by differentially corrected
 HV1893.hand held GPS observations or other comparable positioning techniques
 HV1893.and have an estimated accuracy of +/- 3 meters.
 HV1893
 HV1893.The orthometric height was determined by differential leveling and
 HV1893.adjusted by the NATIONAL GEODETIC SURVEY
 HV1893.in June 1991.
 HV1893
 HV1893.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1893.GEOID18 height accuracy estimate available here.
 HV1893
 HV1893.Click photographs - Photos may exist for this station.
 HV1893
 HV1893.The dynamic height is computed by dividing the NAVD 88
 HV1893.geopotential number by the normal gravity value computed on the
 HV1893.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1893.degrees latitude (g = 980.6199 gals.).
 HV1893
 HV1893.The modeled gravity was interpolated from observed gravity values.
 HV1893
 HV1893
 HV1893_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2362415778(NAD 83)
 HV1893
 HV1893                          SUPERSEDED SURVEY CONTROL
 HV1893
 HV1893  NGVD 29 (11/26/84)   83.189  (m)          272.93   (f) ADJUSTED    1 2
 HV1893
 HV1893.Superseded values are not recommended for survey control.
 HV1893
 HV1893.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1893.See file dsdata.pdf to determine how the superseded data were derived.
 HV1893
 HV1893_MARKER: DD = SURVEY DISK
 HV1893_SETTING: 35 = SET IN A MAT FOUNDATION OR CONCRETE SLAB OTHER THAN
 HV1893+WITH SETTING: PAVEMENT
 HV1893_SP_SET: GATE POST
 HV1893_STAMPING: NW 20
 HV1893_MARK LOGO: PBPP
 HV1893_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1893+STABILITY: SURFACE MOTION
 HV1893_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1893+SATELLITE: SATELLITE OBSERVATIONS - November 28, 2008
 HV1893
 HV1893  HISTORY     - Date     Condition        Report By
 HV1893  HISTORY     - UNK      MONUMENTED       PBPP
 HV1893  HISTORY     - 1926     GOOD             PBPP
 HV1893  HISTORY     - 1960     GOOD             CGS
 HV1893  HISTORY     - 20081128 GOOD             NGS
 HV1893
 HV1893                          STATION DESCRIPTION
 HV1893
 HV1893'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1893'AT WASHINGTON.
 HV1893'AT WASHINGTON, ON SIXTEENTH STREET NORTHWEST, AT THE ENTRANCE
 HV1893'TO WALTER REED HOSPITAL, 60 FEET EAST OF THE EAST CURB OF
 HV1893'SIXTEENTH STREET, 11 FEET NORTH OF THE NORTH CURB OF THE ENTRANCE
 HV1893'ROAD, AT THE NORTH BRICK GATEPOST, IN THE CENTER OF THE WEST
 HV1893'FACE OF THE STONE BASE, AND ABOUT 6 INCHES ABOVE THE GROUND.
 HV1893'A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED
 HV1893'NW 20 AND SET VERTICALLY.
 HV1893
 HV1893                          STATION RECOVERY (1960)
 HV1893
 HV1893'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1893'RECOVERED IN GOOD CONDITION.
 HV1893
 HV1893                          STATION RECOVERY (2008)
 HV1893
 HV1893'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DRD)
 HV1893'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1788 ***********************************************************************
 HV1788  DESIGNATION -  NW 21 PBPP
 HV1788  PID         -  HV1788
 HV1788  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1788  COUNTRY     -  US
 HV1788  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1788
 HV1788                         *CURRENT SURVEY CONTROL
 HV1788  ______________________________________________________________________
 HV1788* NAD 83(1986) POSITION- 38 59 09.     (N) 077 02 14.     (W)   SCALED
 HV1788* NAVD 88 ORTHO HEIGHT -    71.125 (meters)      233.35  (feet) ADJUSTED
 HV1788  ______________________________________________________________________
 HV1788  GEOID HEIGHT    -        -31.963 (meters)                     GEOID18
 HV1788  DYNAMIC HEIGHT  -         71.087 (meters)      233.22  (feet) COMP
 HV1788  MODELED GRAVITY -    980,086.6   (mgal)                       NAVD 88
 HV1788
 HV1788  VERT ORDER      -  FIRST     CLASS II
 HV1788
 HV1788.The horizontal coordinates were scaled from a map and have
 HV1788.an estimated accuracy of +/- 6 seconds.
 HV1788
 HV1788.The orthometric height was determined by differential leveling and
 HV1788.adjusted by the NATIONAL GEODETIC SURVEY
 HV1788.in June 1991.
 HV1788
 HV1788.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1788.GEOID18 height accuracy estimate available here.
 HV1788
 HV1788.Click photographs - Photos may exist for this station.
 HV1788
 HV1788.The dynamic height is computed by dividing the NAVD 88
 HV1788.geopotential number by the normal gravity value computed on the
 HV1788.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1788.degrees latitude (g = 980.6199 gals.).
 HV1788
 HV1788.The modeled gravity was interpolated from observed gravity values.
 HV1788
 HV1788
 HV1788_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ235171(NAD 83)
 HV1788
 HV1788                          SUPERSEDED SURVEY CONTROL
 HV1788
 HV1788  NGVD 29 (11/26/84)   71.358  (m)          234.11   (f) ADJUSTED    1 2
 HV1788
 HV1788.Superseded values are not recommended for survey control.
 HV1788
 HV1788.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1788.See file dsdata.pdf to determine how the superseded data were derived.
 HV1788
 HV1788_MARKER: DD = SURVEY DISK
 HV1788_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1788_SP_SET: BUILDING
 HV1788_STAMPING: NW 21
 HV1788_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1788
 HV1788  HISTORY     - Date     Condition        Report By
 HV1788  HISTORY     - UNK      MONUMENTED       PBPP
 HV1788  HISTORY     - 1933     GOOD             CGS
 HV1788  HISTORY     - 1960     GOOD             CGS
 HV1788  HISTORY     - 20000617 GOOD             USPSQD
 HV1788
 HV1788                          STATION DESCRIPTION
 HV1788
 HV1788'DESCRIBED BY COAST AND GEODETIC SURVEY 1933
 HV1788'0.9 MI SW FROM SILVER SPRINGS.
 HV1788'IN THE DISTRICT OF COLUMBIA, 0.9 MILE SOUTHWEST OF THE BALTIMORE
 HV1788'AND OHIO RAILROAD STATION AT SILVER SPRING, MONTGOMERY COUNTY,
 HV1788'MARYLAND, 215 FEET WEST OF THE WEST CURB OF SIXTEENTH STREET
 HV1788'NORTHWEST, AT 1603 KALMIA ROAD, AT A SMALL BUILDING FORMERLY
 HV1788'USED AS A REAL ESTATE OFFICE, IN THE EAST WALL, 1 FOOT NORTH OF
 HV1788'THE SOUTHEAST CORNER OF THE BUILDING, AND 6 INCHES ABOVE THE
 HV1788'GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK,
 HV1788'STAMPED NW 21 AND SET VERTICALLY.
 HV1788
 HV1788                          STATION RECOVERY (1960)
 HV1788
 HV1788'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1788'RECOVERED IN GOOD CONDITION.
 HV1788
 HV1788                          STATION RECOVERY (2000)
 HV1788
 HV1788'RECOVERY NOTE BY US POWER SQUADRON 2000 (CEM)
 HV1788'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1962 ***********************************************************************
 HV1962  DESIGNATION -  NW 24
 HV1962  PID         -  HV1962
 HV1962  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1962  COUNTRY     -  US
 HV1962  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1962
 HV1962                         *CURRENT SURVEY CONTROL
 HV1962  ______________________________________________________________________
 HV1962* NAD 83(1986) POSITION- 38 54 21.3    (N) 077 04 42.2    (W)   HD_HELD2
 HV1962* NAVD 88 ORTHO HEIGHT -    13.619 (meters)       44.68  (feet) ADJUSTED
 HV1962  ______________________________________________________________________
 HV1962  GEOID HEIGHT    -        -32.000 (meters)                     GEOID18
 HV1962  DYNAMIC HEIGHT  -         13.612 (meters)       44.66  (feet) COMP
 HV1962  MODELED GRAVITY -    980,091.6   (mgal)                       NAVD 88
 HV1962
 HV1962  VERT ORDER      -  FIRST     CLASS II
 HV1962
 HV1962.The horizontal coordinates were established by autonomous hand held GPS
 HV1962.observations and have an estimated accuracy of +/- 10 meters.
 HV1962
 HV1962.The orthometric height was determined by differential leveling and
 HV1962.adjusted by the NATIONAL GEODETIC SURVEY
 HV1962.in June 1991.
 HV1962
 HV1962.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1962.GEOID18 height accuracy estimate available here.
 HV1962
 HV1962.Click photographs - Photos may exist for this station.
 HV1962
 HV1962.The dynamic height is computed by dividing the NAVD 88
 HV1962.geopotential number by the normal gravity value computed on the
 HV1962.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1962.degrees latitude (g = 980.6199 gals.).
 HV1962
 HV1962.The modeled gravity was interpolated from observed gravity values.
 HV1962
 HV1962
 HV1962_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1978208389(NAD 83)
 HV1962
 HV1962                          SUPERSEDED SURVEY CONTROL
 HV1962
 HV1962  NGVD 29 (11/26/84)   13.849  (m)           45.44   (f) ADJUSTED    1 2
 HV1962
 HV1962.Superseded values are not recommended for survey control.
 HV1962
 HV1962.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1962.See file dsdata.pdf to determine how the superseded data were derived.
 HV1962
 HV1962_MARKER: DD = SURVEY DISK
 HV1962_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
 HV1962_SP_SET: RETAINING WALL
 HV1962_STAMPING: NW 24
 HV1962_MARK LOGO: PBPP
 HV1962_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1962+STABILITY: SURFACE MOTION
 HV1962
 HV1962  HISTORY     - Date     Condition        Report By
 HV1962  HISTORY     - UNK      MONUMENTED       PBPP
 HV1962  HISTORY     - 1931     GOOD             PBPP
 HV1962  HISTORY     - 1960     GOOD             CGS
 HV1962  HISTORY     - 20061119 GOOD             GEOCAC
 HV1962
 HV1962                          STATION DESCRIPTION
 HV1962
 HV1962'DESCRIBED BY PUB BLDGS AND PARKS 1931
 HV1962'AT WASHINGTON.
 HV1962'AT WASHINGTON, ON CANAL ROAD NORTHWEST, AT THE JUNCTION OF FOXHALL
 HV1962'ROAD, OPPOSITE A LIGHT POLE, IN THE TOP OF THE CONCRETE WALL
 HV1962'SEPARATING THE ROAD FROM THE CANAL, AND 7 FEET EAST OF THE JUNCTION
 HV1962'OF THE CONCRETE WALL AND THE STONE WALL.  A PUBLIC BUILDINGS AND
 HV1962'PUBLIC PARKS STANDARD DISK, STAMPED NW 24.
 HV1962
 HV1962                          STATION RECOVERY (1960)
 HV1962
 HV1962'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1962'RECOVERED IN GOOD CONDITION.
 HV1962
 HV1962                          STATION RECOVERY (2006)
 HV1962
 HV1962'RECOVERY NOTE BY GEOCACHING 2006 (APC)
 HV1962'FOUND AS DESCRIBED ON TOP OF A CONCRETE WALL IMMEDIATELY NORTH OF THE
 HV1962'C AND O CANAL AND SOUTH OF CANAL ROAD, AND JUST EAST OF WHERE THE
 HV1962'CONCRETE AND STONE PARTS OF THE WALL MEET.
 HV1962'
 HV1962'LOCATION IS ABOUT 250 FEET EAST OF THE INTERSECTION OF CANAL ROAD AND
 HV1962'FOXHALL ROAD.
 HV1962'
 HV1962'IT IS ALSO APPROXIMATELY ACROSS CANAL ROAD FROM THE ENTRANCE OF A
 HV1962'BICYCLE-PEDESTRIAN TRAIL LEADING VIA TUNNEL TO THE CANAL. THE TRAIL
 HV1962'ENTRANCE IS MARKED BY A YELLOW CAUTION 'WALK STEEP SLOPE' SIGN.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1964 ***********************************************************************
 HV1964  DESIGNATION -  NW 25
 HV1964  PID         -  HV1964
 HV1964  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1964  COUNTRY     -  US
 HV1964  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1964
 HV1964                         *CURRENT SURVEY CONTROL
 HV1964  ______________________________________________________________________
 HV1964* NAD 83(1986) POSITION- 38 54 39.5    (N) 077 05 21.7    (W)   HD_HELD2
 HV1964* NAVD 88 ORTHO HEIGHT -    45.875 (meters)      150.51  (feet) ADJUSTED
 HV1964  ______________________________________________________________________
 HV1964  GEOID HEIGHT    -        -31.976 (meters)                     GEOID18
 HV1964  DYNAMIC HEIGHT  -         45.850 (meters)      150.43  (feet) COMP
 HV1964  MODELED GRAVITY -    980,092.1   (mgal)                       NAVD 88
 HV1964
 HV1964  VERT ORDER      -  FIRST     CLASS II
 HV1964
 HV1964.The horizontal coordinates were established by autonomous hand held GPS
 HV1964.observations and have an estimated accuracy of +/- 10 meters.
 HV1964
 HV1964.The orthometric height was determined by differential leveling and
 HV1964.adjusted by the NATIONAL GEODETIC SURVEY
 HV1964.in June 1991.
 HV1964
 HV1964.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1964.GEOID18 height accuracy estimate available here.
 HV1964
 HV1964.Click photographs - Photos may exist for this station.
 HV1964
 HV1964.The dynamic height is computed by dividing the NAVD 88
 HV1964.geopotential number by the normal gravity value computed on the
 HV1964.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1964.degrees latitude (g = 980.6199 gals.).
 HV1964
 HV1964.The modeled gravity was interpolated from observed gravity values.
 HV1964
 HV1964
 HV1964_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1884308972(NAD 83)
 HV1964
 HV1964                          SUPERSEDED SURVEY CONTROL
 HV1964
 HV1964  NGVD 29 (11/26/84)   46.101  (m)          151.25   (f) ADJUSTED    1 2
 HV1964
 HV1964.Superseded values are not recommended for survey control.
 HV1964
 HV1964.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1964.See file dsdata.pdf to determine how the superseded data were derived.
 HV1964
 HV1964_MARKER: DD = SURVEY DISK
 HV1964_SETTING: 34 = SET IN THE FOOTINGS OF SMALL/MEDIUM STRUCTURES
 HV1964_SP_SET: PUMPHOUSE
 HV1964_STAMPING: NW 25
 HV1964_MARK LOGO: PBPP
 HV1964_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1964+STABILITY: SURFACE MOTION
 HV1964
 HV1964  HISTORY     - Date     Condition        Report By
 HV1964  HISTORY     - UNK      MONUMENTED       PBPP
 HV1964  HISTORY     - 1931     GOOD             PBPP
 HV1964  HISTORY     - 1960     GOOD             CGS
 HV1964
 HV1964                          STATION DESCRIPTION
 HV1964
 HV1964'DESCRIBED BY PUB BLDGS AND PARKS 1931
 HV1964'AT WASHINGTON.
 HV1964'AT WASHINGTON, ON MAC ARTHUR BOULEVARD NORTHWEST, AT THE EAST END
 HV1964'OF THE DISTRIBUTING RESERVOIR, AT THE NORTHEAST CORNER OF THE
 HV1964'PUMPHOUSE, IN THE WALL FACING THE BOULEVARD, MIDWAY BETWEEN THE
 HV1964'CORNERS OF THE TOWER, AND 1.5 FEET ABOVE THE SIDEWALK.  A PUBLIC
 HV1964'BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED NW 25 AND SET
 HV1964'VERTICALLY.
 HV1964
 HV1964                          STATION RECOVERY (1960)
 HV1964
 HV1964'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1964'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1965 ***********************************************************************
 HV1965  DESIGNATION -  NW 26
 HV1965  PID         -  HV1965
 HV1965  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1965  COUNTRY     -  US
 HV1965  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1965
 HV1965                         *CURRENT SURVEY CONTROL
 HV1965  ______________________________________________________________________
 HV1965* NAD 83(1986) POSITION- 38 54 55.68   (N) 077 05 41.24   (W)   HD_HELD1
 HV1965* NAVD 88 ORTHO HEIGHT -    46.184 (meters)      151.52  (feet) ADJUSTED
 HV1965  ______________________________________________________________________
 HV1965  GEOID HEIGHT    -        -31.963 (meters)                     GEOID18
 HV1965  DYNAMIC HEIGHT  -         46.159 (meters)      151.44  (feet) COMP
 HV1965  MODELED GRAVITY -    980,093.6   (mgal)                       NAVD 88
 HV1965
 HV1965  VERT ORDER      -  FIRST     CLASS II
 HV1965
 HV1965.The horizontal coordinates were determined by differentially corrected
 HV1965.hand held GPS observations or other comparable positioning techniques
 HV1965.and have an estimated accuracy of +/- 3 meters.
 HV1965
 HV1965.The orthometric height was determined by differential leveling and
 HV1965.adjusted by the NATIONAL GEODETIC SURVEY
 HV1965.in June 1991.
 HV1965
 HV1965.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1965.GEOID18 height accuracy estimate available here.
 HV1965
 HV1965.Click photographs - Photos may exist for this station.
 HV1965
 HV1965.The dynamic height is computed by dividing the NAVD 88
 HV1965.geopotential number by the normal gravity value computed on the
 HV1965.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1965.degrees latitude (g = 980.6199 gals.).
 HV1965
 HV1965.The modeled gravity was interpolated from observed gravity values.
 HV1965
 HV1965
 HV1965_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1838409481(NAD 83)
 HV1965
 HV1965                          SUPERSEDED SURVEY CONTROL
 HV1965
 HV1965  NGVD 29 (11/26/84)   46.407  (m)          152.25   (f) ADJUSTED    1 2
 HV1965
 HV1965.Superseded values are not recommended for survey control.
 HV1965
 HV1965.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1965.See file dsdata.pdf to determine how the superseded data were derived.
 HV1965
 HV1965_MARKER: DD = SURVEY DISK
 HV1965_SETTING: 34 = SET IN THE FOOTINGS OF SMALL/MEDIUM STRUCTURES
 HV1965_SP_SET: BUILDING
 HV1965_MARK LOGO: PBPP
 HV1965_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1965+STABILITY: SURFACE MOTION
 HV1965_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1965+SATELLITE: SATELLITE OBSERVATIONS - March 29, 1990
 HV1965
 HV1965  HISTORY     - Date     Condition        Report By
 HV1965  HISTORY     - UNK      MONUMENTED       PBPP
 HV1965  HISTORY     - 1931     GOOD             PBPP
 HV1965  HISTORY     - 1965     GOOD             CGS
 HV1965  HISTORY     - 1979     GOOD             NGS
 HV1965  HISTORY     - 19900329 GOOD             NGS
 HV1965
 HV1965                          STATION DESCRIPTION
 HV1965
 HV1965'DESCRIBED BY PUB BLDGS AND PARKS 1931
 HV1965'AT WASHINGTON.
 HV1965'AT WASHINGTON, ON MAC ARTHUR BOULEVARD NORTHWEST, NEAR THE
 HV1965'INTERSECTION OF RESERVOIR ROAD, AT THE WEST END OF THE DISTRIBUTING
 HV1965'RESERVOIR, AT AN OCTAGONAL STONE HOUSE, IN THE WALL PARALLELING
 HV1965'RESERVOIR ROAD, MIDWAY BETWEEN THE TWO CORNERS, AND ABOUT 2 FEET
 HV1965'ABOVE THE GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD
 HV1965'DISK, SET VERTICALLY.
 HV1965
 HV1965                          STATION RECOVERY (1965)
 HV1965
 HV1965'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1965
 HV1965'RECOVERED IN GOOD CONDITION.
 HV1965
 HV1965                          STATION RECOVERY (1979)
 HV1965
 HV1965'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1965'RECOVERED IN GOOD CONDITION.
 HV1965
 HV1965                          STATION RECOVERY (1990)
 HV1965
 HV1965'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990
 HV1965'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1966 ***********************************************************************
 HV1966  DESIGNATION -  NW 27 PBPP
 HV1966  PID         -  HV1966
 HV1966  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1966  COUNTRY     -  US
 HV1966  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1966
 HV1966                         *CURRENT SURVEY CONTROL
 HV1966  ______________________________________________________________________
 HV1966* NAD 83(1986) POSITION- 38 55 23.     (N) 077 06 02.     (W)   SCALED
 HV1966* NAVD 88 ORTHO HEIGHT -    45.97  (+/-2cm)      150.8   (feet) VERTCON3
 HV1966  ______________________________________________________________________
 HV1966  GEOID HEIGHT    -        -31.944 (meters)                     GEOID18
 HV1966  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1966
 HV1966.The horizontal coordinates were scaled from a map and have
 HV1966.an estimated accuracy of +/- 6 seconds.
 HV1966
 HV1966.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1966.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1966
 HV1966.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1966.GEOID18 height accuracy estimate available here.
 HV1966
 HV1966.The vertical order pertains to the NGVD 29 superseded value.
 HV1966
 HV1966.Click photographs - Photos may exist for this station.
 HV1966
 HV1966
 HV1966_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ179103(NAD 83)
 HV1966
 HV1966                          SUPERSEDED SURVEY CONTROL
 HV1966
 HV1966  NGVD 29 (11/26/84)   46.192  (m)          151.55   (f) ADJUSTED    1 2
 HV1966
 HV1966.Superseded values are not recommended for survey control.
 HV1966
 HV1966.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1966.See file dsdata.pdf to determine how the superseded data were derived.
 HV1966
 HV1966_MARKER: DD = SURVEY DISK
 HV1966_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1966_SP_SET: CHIMNEY
 HV1966_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1966
 HV1966  HISTORY     - Date     Condition        Report By
 HV1966  HISTORY     - UNK      MONUMENTED       PBPP
 HV1966  HISTORY     - 1931     GOOD             PBPP
 HV1966  HISTORY     - 1960     GOOD             CGS
 HV1966
 HV1966                          STATION DESCRIPTION
 HV1966
 HV1966'DESCRIBED BY PUB BLDGS AND PARKS 1931
 HV1966'AT WASHINGTON.
 HV1966'AT WASHINGTON, ON MACARTHUR BOULEVARD NORTHWEST (FORMERLY CONDUIT
 HV1966'ROAD), AT THE HOUSE AT 4937 MACARTHUR BOULEVARD, ON THE WEST SIDE
 HV1966'OF THE HOUSE, IN THE SOUTH SIDE OF A BRICK CHIMNEY, 0.5 FOOT FROM
 HV1966'THE HOUSE WALL, AND ABOUT 2 FEET ABOVE THE GROUND.  A PUBLIC
 HV1966'BUILDINGS AND PUBLIC PARKS STANDARD DISK, SET VERTICALLY.
 HV1966
 HV1966                          STATION RECOVERY (1960)
 HV1966
 HV1966'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1966'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1963 ***********************************************************************
 HV1963  DESIGNATION -  NW 29
 HV1963  PID         -  HV1963
 HV1963  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1963  COUNTRY     -  US
 HV1963  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1963
 HV1963                         *CURRENT SURVEY CONTROL
 HV1963  ______________________________________________________________________
 HV1963* NAD 83(1986) POSITION- 38 54 44.     (N) 077 05 04.     (W)   SCALED
 HV1963* NAVD 88 ORTHO HEIGHT -    55.01  (+/-2cm)      180.5   (feet) VERTCON3
 HV1963  ______________________________________________________________________
 HV1963  GEOID HEIGHT    -        -31.980 (meters)                     GEOID18
 HV1963  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1963
 HV1963.The horizontal coordinates were scaled from a map and have
 HV1963.an estimated accuracy of +/- 6 seconds.
 HV1963
 HV1963.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1963.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1963
 HV1963.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1963.GEOID18 height accuracy estimate available here.
 HV1963
 HV1963.The vertical order pertains to the NGVD 29 superseded value.
 HV1963
 HV1963.Click photographs - Photos may exist for this station.
 HV1963
 HV1963
 HV1963_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ192091(NAD 83)
 HV1963
 HV1963                          SUPERSEDED SURVEY CONTROL
 HV1963
 HV1963  NGVD 29 (11/26/84)   55.238  (m)          181.23   (f) ADJUSTED    1 2
 HV1963
 HV1963.Superseded values are not recommended for survey control.
 HV1963
 HV1963.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1963.See file dsdata.pdf to determine how the superseded data were derived.
 HV1963
 HV1963_MARKER: DD = SURVEY DISK
 HV1963_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1963_SP_SET: BUILDING
 HV1963_STAMPING: NW 29
 HV1963_MARK LOGO: PBPP
 HV1963_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1963
 HV1963  HISTORY     - Date     Condition        Report By
 HV1963  HISTORY     - UNK      MONUMENTED       PBPP
 HV1963  HISTORY     - 1931     GOOD             PBPP
 HV1963  HISTORY     - 1943     GOOD             CGS
 HV1963
 HV1963                          STATION DESCRIPTION
 HV1963
 HV1963'DESCRIBED BY PUB BLDGS AND PARKS 1931
 HV1963'AT WASHINGTON.
 HV1963'AT WASHINGTON, ON RESERVOIR ROAD NORTHWEST, 150 FEET EAST OF
 HV1963'FOXHALL ROAD, AT THE BRICK HOUSE AT 4478 RESERVOIR ROAD, IN THE
 HV1963'REAR (SOUTH) WALL, 2 FEET EAST OF THE SOUTHWEST CORNER OF THE
 HV1963'HOUSE, AND ABOUT 1 FOOT ABOVE THE SIDEWALK.  A PUBLIC BUILDINGS
 HV1963'AND PUBLIC PARKS STANDARD DISK, STAMPED NW 29 AND SET VERTICALLY.
 HV1963
 HV1963                          STATION RECOVERY (1943)
 HV1963
 HV1963'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943
 HV1963'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1895 ***********************************************************************
 HV1895  DESIGNATION -  NW 3
 HV1895  PID         -  HV1895
 HV1895  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1895  COUNTRY     -  US
 HV1895  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1895
 HV1895                         *CURRENT SURVEY CONTROL
 HV1895  ______________________________________________________________________
 HV1895* NAD 83(1986) POSITION- 38 53 54.86   (N) 077 02 17.37   (W)   HD_HELD1
 HV1895* NAVD 88 ORTHO HEIGHT -    17.517 (meters)       57.47  (feet) ADJUSTED
 HV1895  ______________________________________________________________________
 HV1895  GEOID HEIGHT    -        -32.066 (meters)                     GEOID18
 HV1895  DYNAMIC HEIGHT  -         17.508 (meters)       57.44  (feet) COMP
 HV1895  MODELED GRAVITY -    980,097.5   (mgal)                       NAVD 88
 HV1895
 HV1895  VERT ORDER      -  FIRST     CLASS II
 HV1895
 HV1895.The horizontal coordinates were determined by differentially corrected
 HV1895.hand held GPS observations or other comparable positioning techniques
 HV1895.and have an estimated accuracy of +/- 3 meters.
 HV1895
 HV1895.The orthometric height was determined by differential leveling and
 HV1895.adjusted by the NATIONAL GEODETIC SURVEY
 HV1895.in April 2010.
 HV1895
 HV1895.No vertical observational check was made to the station.
 HV1895
 HV1895.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1895.GEOID18 height accuracy estimate available here.
 HV1895
 HV1895.Click photographs - Photos may exist for this station.
 HV1895
 HV1895.The dynamic height is computed by dividing the NAVD 88
 HV1895.geopotential number by the normal gravity value computed on the
 HV1895.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1895.degrees latitude (g = 980.6199 gals.).
 HV1895
 HV1895.The modeled gravity was interpolated from observed gravity values.
 HV1895
 HV1895
 HV1895_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2325207495(NAD 83)
 HV1895
 HV1895                          SUPERSEDED SURVEY CONTROL
 HV1895
 HV1895  NAVD 88 (06/15/91)   17.513  (m)           57.46   (f) SUPERSEDED  1 0
 HV1895  NGVD 29 (08/12/92)   17.745  (m)           58.22   (f) ADJUSTED    1 0
 HV1895  NGVD 29 (??/??/87)   17.745  (m)           58.22   (f) SUPERSEDED  1 0
 HV1895
 HV1895.Superseded values are not recommended for survey control.
 HV1895
 HV1895.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1895.See file dsdata.pdf to determine how the superseded data were derived.
 HV1895
 HV1895_MARKER: DD = SURVEY DISK
 HV1895_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1895_SP_SET: STONE FOUNDATION FOR FENCE
 HV1895_STAMPING: NW 3
 HV1895_MARK LOGO: NONE
 HV1895_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1895_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1895_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1895+SATELLITE: SATELLITE OBSERVATIONS - July 18, 2018
 HV1895
 HV1895  HISTORY     - Date     Condition        Report By
 HV1895  HISTORY     - UNK      MONUMENTED       PBPP
 HV1895  HISTORY     - 1971     GOOD             NGS
 HV1895  HISTORY     - 1974     GOOD             NGS
 HV1895  HISTORY     - 1978     GOOD             NGS
 HV1895  HISTORY     - 1978     GOOD             NGS
 HV1895  HISTORY     - 1979     GOOD             NGS
 HV1895  HISTORY     - 1984     GOOD             NGS
 HV1895  HISTORY     - 19920615 GOOD             NGS
 HV1895  HISTORY     - 20020812 GOOD             GEOCAC
 HV1895  HISTORY     - 20081009 GOOD             NGS
 HV1895  HISTORY     - 20081222 GOOD             NGS
 HV1895  HISTORY     - 20180718 GOOD             USPSQD
 HV1895
 HV1895                          STATION DESCRIPTION
 HV1895
 HV1895'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1895'AT WASHINGTON.
 HV1895'AT WASHINGTON, D.C., ABOUT 0.1 MILE NORTHWEST OF THE WHITE
 HV1895'HOUSE, AT THE NORTHEAST CORNER OF A METAL FENCE AROUND THE OLD
 HV1895'EXECUTIVE OFFICE BUILDING, SET IN THE TOP OF THE STONE FOUNDATION
 HV1895'FOR THE FENCE, 41 FEET WEST OF THE CENTER OF A METAL GATE
 HV1895'ACROSS WEST EXECUTIVE AVENUE, 36.0 FEET SOUTH OF THE SOUTH CURB
 HV1895'OF PENNSYLVANIA AVENUE, 0.8 FOOT WEST OF THE WEST FACE OF THE
 HV1895'STONE CORNER FENCE POST, AND ABOUT 1 1/2 FEET ABOVE THE LEVEL
 HV1895'OF THE SIDEWALK.
 HV1895
 HV1895                          STATION RECOVERY (1974)
 HV1895
 HV1895'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974
 HV1895'RECOVERED IN GOOD CONDITION.
 HV1895
 HV1895                          STATION RECOVERY (1978)
 HV1895
 HV1895'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV1895'RECOVERED IN GOOD CONDITION.
 HV1895
 HV1895                          STATION RECOVERY (1978)
 HV1895
 HV1895'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV1895'RECOVERED IN GOOD CONDITION.
 HV1895
 HV1895                          STATION RECOVERY (1979)
 HV1895
 HV1895'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1895'RECOVERED IN GOOD CONDITION.
 HV1895
 HV1895                          STATION RECOVERY (1984)
 HV1895
 HV1895'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984
 HV1895'RECOVERED IN GOOD CONDITION.
 HV1895
 HV1895                          STATION RECOVERY (1992)
 HV1895
 HV1895'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1895'IN WASHINGTON, D.C., 0.2 KM (0.10 MI) NORTHWEST OF THE WHITE HOUSE, AT
 HV1895'THE NORTHEAST CORNER OF A METAL FENCE SURROUNDING THE OLD EXECUTIVE
 HV1895'OFFICE BUILDING, SET IN THE TOP OF THE STONE FOUNDATION FOR THE
 HV1895'FENCE, 12.5 M (41.0 FT) WEST OF THE CENTER OF A GATE ACROSS WEST
 HV1895'EXECUTIVE AVENUE, 11.0 M (36.1 FT) SOUTH OF THE SOUTH CURB OF
 HV1895'PENNSYLVANIA AVENUE, 0.5 M (1.6 FT) ABOVE THE LEVEL OF THE SIDEWALK,
 HV1895'AND 0.3 M (1.0 FT) WEST OF THE WEST FACE OF THE FENCE CORNER POST.
 HV1895
 HV1895                          STATION RECOVERY (2002)
 HV1895
 HV1895'RECOVERY NOTE BY GEOCACHING 2002 (APC)
 HV1895'RECOVERED IN GOOD CONDITION.
 HV1895
 HV1895                          STATION RECOVERY (2008)
 HV1895
 HV1895'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DRD)
 HV1895'RECOVERED IN GOOD CONDITION.
 HV1895
 HV1895                          STATION RECOVERY (2008)
 HV1895
 HV1895'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV1895'RECOVERED AS DESCRIBED.
 HV1895
 HV1895                          STATION RECOVERY (2018)
 HV1895
 HV1895'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV1895'THE STAMPING IS WORN.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1955 ***********************************************************************
 HV1955  DESIGNATION -  NW 30
 HV1955  PID         -  HV1955
 HV1955  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1955  COUNTRY     -  US
 HV1955  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1955
 HV1955                         *CURRENT SURVEY CONTROL
 HV1955  ______________________________________________________________________
 HV1955* NAD 83(1986) POSITION- 38 54 45.     (N) 077 04 36.     (W)   SCALED
 HV1955* NAVD 88 ORTHO HEIGHT -    46.50  (+/-2cm)      152.6   (feet) VERTCON3
 HV1955  ______________________________________________________________________
 HV1955  GEOID HEIGHT    -        -31.990 (meters)                     GEOID18
 HV1955  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1955
 HV1955.The horizontal coordinates were scaled from a map and have
 HV1955.an estimated accuracy of +/- 6 seconds.
 HV1955
 HV1955.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1955.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1955
 HV1955.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1955.GEOID18 height accuracy estimate available here.
 HV1955
 HV1955.The vertical order pertains to the NGVD 29 superseded value.
 HV1955
 HV1955.Click photographs - Photos may exist for this station.
 HV1955
 HV1955
 HV1955_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ199091(NAD 83)
 HV1955
 HV1955                          SUPERSEDED SURVEY CONTROL
 HV1955
 HV1955  NGVD 29 (11/26/84)   46.732  (m)          153.32   (f) ADJUSTED    1 2
 HV1955
 HV1955.Superseded values are not recommended for survey control.
 HV1955
 HV1955.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1955.See file dsdata.pdf to determine how the superseded data were derived.
 HV1955
 HV1955_MARKER: DD = SURVEY DISK
 HV1955_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1955_SP_SET: BUILDING
 HV1955_STAMPING: NW 30
 HV1955_MARK LOGO: PBPP
 HV1955_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1955
 HV1955  HISTORY     - Date     Condition        Report By
 HV1955  HISTORY     - UNK      MONUMENTED       PBPP
 HV1955  HISTORY     - 1926     GOOD             PBPP
 HV1955  HISTORY     - 1943     GOOD             CGS
 HV1955
 HV1955                          STATION DESCRIPTION
 HV1955
 HV1955'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1955'AT WASHINGTON.
 HV1955'IN SOUTH PLASTERED WALL OF GATEHOUSE, ON NORTH SIDE OF RESERVOIR
 HV1955'ROAD AT ENTRANCE TO ARCHBOLD ESTATE, 6 FT EAST OF S.W. CORNER
 HV1955'OF HOUSE AND 1 FT ABOVE GROUND.  NOTE-- MARK IS OPPOSITE EAST
 HV1955'WING OF GEORGETOWN UNIVERSITY MEDICAL SCHOOL.
 HV1955
 HV1955                          STATION RECOVERY (1943)
 HV1955
 HV1955'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943
 HV1955'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1956 ***********************************************************************
 HV1956  DESIGNATION -  NW 31
 HV1956  PID         -  HV1956
 HV1956  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1956  COUNTRY     -  US
 HV1956  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1956
 HV1956                         *CURRENT SURVEY CONTROL
 HV1956  ______________________________________________________________________
 HV1956* NAD 83(1986) POSITION- 38 54 46.02   (N) 077 04 15.23   (W)   HD_HELD1
 HV1956* NAVD 88 ORTHO HEIGHT -    57.498 (meters)      188.64  (feet) ADJUSTED
 HV1956  ______________________________________________________________________
 HV1956  GEOID HEIGHT    -        -31.998 (meters)                     GEOID18
 HV1956  DYNAMIC HEIGHT  -         57.467 (meters)      188.54  (feet) COMP
 HV1956  MODELED GRAVITY -    980,090.6   (mgal)                       NAVD 88
 HV1956
 HV1956  VERT ORDER      -  FIRST     CLASS I
 HV1956
 HV1956.The horizontal coordinates were determined by differentially corrected
 HV1956.hand held GPS observations or other comparable positioning techniques
 HV1956.and have an estimated accuracy of +/- 3 meters.
 HV1956
 HV1956.The orthometric height was determined by differential leveling and
 HV1956.adjusted by the NATIONAL GEODETIC SURVEY
 HV1956.in June 1991.
 HV1956
 HV1956.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1956.GEOID18 height accuracy estimate available here.
 HV1956
 HV1956.Click photographs - Photos may exist for this station.
 HV1956
 HV1956.The dynamic height is computed by dividing the NAVD 88
 HV1956.geopotential number by the normal gravity value computed on the
 HV1956.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1956.degrees latitude (g = 980.6199 gals.).
 HV1956
 HV1956.The modeled gravity was interpolated from observed gravity values.
 HV1956
 HV1956
 HV1956_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2044909136(NAD 83)
 HV1956
 HV1956                          SUPERSEDED SURVEY CONTROL
 HV1956
 HV1956  NGVD 29 (11/26/84)   57.727  (m)          189.39   (f) ADJUSTED    1 1
 HV1956
 HV1956.Superseded values are not recommended for survey control.
 HV1956
 HV1956.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1956.See file dsdata.pdf to determine how the superseded data were derived.
 HV1956
 HV1956_MARKER: DD = SURVEY DISK
 HV1956_SETTING: 40 = SET IN A LARGE STRUCTURE WITH DEEP FOUNDATIONS
 HV1956_SP_SET: BUILDING
 HV1956_STAMPING: NW 31
 HV1956_MARK LOGO: PBPP
 HV1956_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 HV1956+STABILITY: POSITION/ELEVATION WELL
 HV1956_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1956+SATELLITE: SATELLITE OBSERVATIONS - March 30, 1990
 HV1956
 HV1956  HISTORY     - Date     Condition        Report By
 HV1956  HISTORY     - UNK      MONUMENTED       PBPP
 HV1956  HISTORY     - 1926     GOOD             PBPP
 HV1956  HISTORY     - 1943     GOOD             CGS
 HV1956  HISTORY     - 1984     GOOD             NGS
 HV1956  HISTORY     - 19900330 GOOD             NGS
 HV1956
 HV1956                          STATION DESCRIPTION
 HV1956
 HV1956'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1956'AT WASHINGTON.
 HV1956'AT WASHINGTON, AT THE INTERSECTION OF THIRTY-SIXTH STREET AND
 HV1956'RESERVOIR ROAD NORTHWEST, AT WESTERN HIGH SCHOOL, IN THE WEST
 HV1956'BRICK WALL OF THE ANNEX, 1 FOOT NORTH OF THE SOUTHWEST CORNER,
 HV1956'AND ABOUT 1 FOOT ABOVE THE GROUND.  A PUBLIC BUILDINGS AND PUBLIC
 HV1956'PARKS STANDARD DISK, STAMPED NW 31 AND SET VERTICALLY.
 HV1956
 HV1956                          STATION RECOVERY (1943)
 HV1956
 HV1956'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943
 HV1956'RECOVERED IN GOOD CONDITION.
 HV1956
 HV1956                          STATION RECOVERY (1984)
 HV1956
 HV1956'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984
 HV1956'RECOVERED IN GOOD CONDITION.
 HV1956
 HV1956                          STATION RECOVERY (1990)
 HV1956
 HV1956'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990
 HV1956'IN WASHINGTON DC, AT THE INTERSECTION OF NORTHWEST RIVER ROAD AND 36TH
 HV1956'STREET, SET VERTICALLY IN THE WEST FACE OF A LARGE BRICK BUILDING,
 HV1956'19.5 M (63.98 FT) EAST OF THE CENTER OF THE STREET, 16.5 M
 HV1956'(54.13 FT) NORTH OF THE CENTERLINE OF THE ROAD, 2.5 M (8.20 FT) ABOVE
 HV1956'THE LEVEL OF THE ROAD, 0.3 M (0.98 FT) NORTH OF THE SOUTHWEST CORNER
 HV1956'OF THE BUILDING, AND 0.3 M (0.98 FT) ABOVE THE GROUND SURFACE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1957 ***********************************************************************
 HV1957  DESIGNATION -  NW 32
 HV1957  PID         -  HV1957
 HV1957  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1957  COUNTRY     -  US
 HV1957  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1957
 HV1957                         *CURRENT SURVEY CONTROL
 HV1957  ______________________________________________________________________
 HV1957* NAD 83(1986) POSITION- 38 55 03.     (N) 077 04 10.     (W)   SCALED
 HV1957* NAVD 88 ORTHO HEIGHT -    72.259 (meters)      237.07  (feet) ADJUSTED
 HV1957  ______________________________________________________________________
 HV1957  GEOID HEIGHT    -        -31.992 (meters)                     GEOID18
 HV1957  DYNAMIC HEIGHT  -         72.220 (meters)      236.94  (feet) COMP
 HV1957  MODELED GRAVITY -    980,089.5   (mgal)                       NAVD 88
 HV1957
 HV1957  VERT ORDER      -  FIRST     CLASS II
 HV1957
 HV1957.The horizontal coordinates were scaled from a map and have
 HV1957.an estimated accuracy of +/- 6 seconds.
 HV1957
 HV1957.The orthometric height was determined by differential leveling and
 HV1957.adjusted by the NATIONAL GEODETIC SURVEY
 HV1957.in June 1991.
 HV1957
 HV1957.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1957.GEOID18 height accuracy estimate available here.
 HV1957
 HV1957.Click photographs - Photos may exist for this station.
 HV1957
 HV1957.The dynamic height is computed by dividing the NAVD 88
 HV1957.geopotential number by the normal gravity value computed on the
 HV1957.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1957.degrees latitude (g = 980.6199 gals.).
 HV1957
 HV1957.The modeled gravity was interpolated from observed gravity values.
 HV1957
 HV1957
 HV1957_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ205096(NAD 83)
 HV1957
 HV1957                          SUPERSEDED SURVEY CONTROL
 HV1957
 HV1957  NGVD 29 (11/26/84)   72.486  (m)          237.81   (f) ADJUSTED    1 2
 HV1957
 HV1957.Superseded values are not recommended for survey control.
 HV1957
 HV1957.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1957.See file dsdata.pdf to determine how the superseded data were derived.
 HV1957
 HV1957_MARKER: DD = SURVEY DISK
 HV1957_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
 HV1957_SP_SET: RETAINING WALL
 HV1957_STAMPING: NW 32
 HV1957_MARK LOGO: PBPP
 HV1957_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1957+STABILITY: SURFACE MOTION
 HV1957_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1957+SATELLITE: SATELLITE OBSERVATIONS - March 30, 1990
 HV1957
 HV1957  HISTORY     - Date     Condition        Report By
 HV1957  HISTORY     - UNK      MONUMENTED       PBPP
 HV1957  HISTORY     - 1926     GOOD             PBPP
 HV1957  HISTORY     - 1960     GOOD             CGS
 HV1957  HISTORY     - 1984     GOOD             NGS
 HV1957  HISTORY     - 19900330 GOOD             NGS
 HV1957
 HV1957                          STATION DESCRIPTION
 HV1957
 HV1957'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1957'AT WASHINGTON.
 HV1957'AT WASHINGTON, ON WISCONSIN AVENUE NORTHWEST, AT THE INTERSECTION
 HV1957'OF THIRTY-FIFTH STREET, OPPOSITE THE HOUSE AT 2101 WISCONSIN
 HV1957'AVENUE, IN THE FACE OF A STONE WALL ALONG THE WEST SIDE OF THE
 HV1957'AVENUE (THE WALL IS AROUND A CEMETERY), 1 FOOT NORTH OF AN OBLIQUE
 HV1957'CORNER OF THE WALL, AND ABOUT 2 FEET ABOVE THE SIDEWALK.  A PUBLIC
 HV1957'BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED NW 32 AND
 HV1957'SET VERTICALLY.
 HV1957
 HV1957                          STATION RECOVERY (1960)
 HV1957
 HV1957'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1957'RECOVERED IN GOOD CONDITION.
 HV1957
 HV1957                          STATION RECOVERY (1984)
 HV1957
 HV1957'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984
 HV1957'RECOVERED IN GOOD CONDITION.
 HV1957
 HV1957                          STATION RECOVERY (1990)
 HV1957
 HV1957'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990
 HV1957'IN WASHINGTON DC, AT THE INTERSECTION OF 35TH STREET AND NORTHWEST
 HV1957'WISCONSIN AVENUE, SET VERTICALLY IN THE NORTHEAST FACE OF A ROCK
 HV1957'RETAINING WALL AROUND A CEMETERY, 12.5 M (41.01 FT) WEST OF THE
 HV1957'EXTENDED CENTER OF THE STREET, 9.9 M (32.48 FT) SOUTHWEST OF THE
 HV1957'CENTERLINE OF THE AVENUE, 0.6 M (1.97 FT) ABOVE THE LEVEL OF THE
 HV1957'AVENUE, AND 0.3 M (0.98 FT) NORTHWEST OF THE NORTHEAST CORNER OF THE
 HV1957'RETAINING WALL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1958 ***********************************************************************
 HV1958  DESIGNATION -  NW 33
 HV1958  PID         -  HV1958
 HV1958  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1958  COUNTRY     -  US
 HV1958  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1958
 HV1958                         *CURRENT SURVEY CONTROL
 HV1958  ______________________________________________________________________
 HV1958* NAD 83(1986) POSITION- 38 55 45.1    (N) 077 04 23.7    (W)   HD_HELD2
 HV1958* NAVD 88 ORTHO HEIGHT -   114.824 (meters)      376.72  (feet) ADJUSTED
 HV1958  ______________________________________________________________________
 HV1958  GEOID HEIGHT    -        -31.967 (meters)                     GEOID18
 HV1958  DYNAMIC HEIGHT  -        114.762 (meters)      376.52  (feet) COMP
 HV1958  MODELED GRAVITY -    980,085.6   (mgal)                       NAVD 88
 HV1958
 HV1958  VERT ORDER      -  FIRST     CLASS II
 HV1958
 HV1958.The horizontal coordinates were established by autonomous hand held GPS
 HV1958.observations and have an estimated accuracy of +/- 10 meters.
 HV1958
 HV1958.The orthometric height was determined by differential leveling and
 HV1958.adjusted by the NATIONAL GEODETIC SURVEY
 HV1958.in June 1991.
 HV1958
 HV1958.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1958.GEOID18 height accuracy estimate available here.
 HV1958
 HV1958.Click photographs - Photos may exist for this station.
 HV1958
 HV1958.The dynamic height is computed by dividing the NAVD 88
 HV1958.geopotential number by the normal gravity value computed on the
 HV1958.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1958.degrees latitude (g = 980.6199 gals.).
 HV1958
 HV1958.The modeled gravity was interpolated from observed gravity values.
 HV1958
 HV1958
 HV1958_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2028610962(NAD 83)
 HV1958
 HV1958                          SUPERSEDED SURVEY CONTROL
 HV1958
 HV1958  NGVD 29 (11/26/84)  115.048  (m)          377.45   (f) ADJUSTED    1 2
 HV1958
 HV1958.Superseded values are not recommended for survey control.
 HV1958
 HV1958.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1958.See file dsdata.pdf to determine how the superseded data were derived.
 HV1958
 HV1958_MARKER: DD = SURVEY DISK
 HV1958_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1958_SP_SET: BUILDING
 HV1958_STAMPING: NW 33
 HV1958_MARK LOGO: PBPP
 HV1958_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1958_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1958+SATELLITE: SATELLITE OBSERVATIONS - November 10, 2020
 HV1958
 HV1958  HISTORY     - Date     Condition        Report By
 HV1958  HISTORY     - UNK      MONUMENTED       PBPP
 HV1958  HISTORY     - 1926     GOOD             PBPP
 HV1958  HISTORY     - 1943     GOOD             CGS
 HV1958  HISTORY     - 20201110 GOOD             NGS
 HV1958
 HV1958                          STATION DESCRIPTION
 HV1958
 HV1958'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1958'AT WASHINGTON.
 HV1958'AT WASHINGTON, ON WISCONSIN AVENUE NORTHWEST, NEAR THE INTERSECTION
 HV1958'OF MASSACHUSETTS AVENUE NORTHWEST, AT THE INTERSECTION OF CATHEDRAL
 HV1958'AVENUE, AT THE TAN BRICK APARTMENT HOUSE AT THE NORTHWEST CORNER
 HV1958'OF THE INTERSECTION, IN THE EAST WALL, 3 FEET NORTH OF THE
 HV1958'SOUTHEAST CORNER, AND ABOUT 1 FOOT ABOVE THE GROUND.  A PUBLIC
 HV1958'BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED NW 33 AND SET
 HV1958'VERTICALLY.
 HV1958
 HV1958                          STATION RECOVERY (1943)
 HV1958
 HV1958'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943
 HV1958'RECOVERED IN GOOD CONDITION.
 HV1958
 HV1958                          STATION RECOVERY (2020)
 HV1958
 HV1958'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JH)
 HV1958'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1959 ***********************************************************************
 HV1959  DESIGNATION -  NW 34
 HV1959  PID         -  HV1959
 HV1959  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1959  COUNTRY     -  US
 HV1959  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1959
 HV1959                         *CURRENT SURVEY CONTROL
 HV1959  ______________________________________________________________________
 HV1959* NAD 83(1986) POSITION- 38 56 12.27   (N) 077 05 13.83   (W)   HD_HELD1
 HV1959* NAVD 88 ORTHO HEIGHT -   120.079 (meters)      393.96  (feet) ADJUSTED
 HV1959  ______________________________________________________________________
 HV1959  GEOID HEIGHT    -        -31.939 (meters)                     GEOID18
 HV1959  DYNAMIC HEIGHT  -        120.014 (meters)      393.75  (feet) COMP
 HV1959  MODELED GRAVITY -    980,082.4   (mgal)                       NAVD 88
 HV1959
 HV1959  VERT ORDER      -  FIRST     CLASS II
 HV1959
 HV1959.The horizontal coordinates were determined by differentially corrected
 HV1959.hand held GPS observations or other comparable positioning techniques
 HV1959.and have an estimated accuracy of +/- 3 meters.
 HV1959
 HV1959.The orthometric height was determined by differential leveling and
 HV1959.adjusted by the NATIONAL GEODETIC SURVEY
 HV1959.in June 1991.
 HV1959
 HV1959.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1959.GEOID18 height accuracy estimate available here.
 HV1959
 HV1959.Click photographs - Photos may exist for this station.
 HV1959
 HV1959.The dynamic height is computed by dividing the NAVD 88
 HV1959.geopotential number by the normal gravity value computed on the
 HV1959.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1959.degrees latitude (g = 980.6199 gals.).
 HV1959
 HV1959.The modeled gravity was interpolated from observed gravity values.
 HV1959
 HV1959
 HV1959_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1909811828(NAD 83)
 HV1959
 HV1959                          SUPERSEDED SURVEY CONTROL
 HV1959
 HV1959  NGVD 29 (11/26/84)  120.299  (m)          394.68   (f) ADJUSTED    1 2
 HV1959
 HV1959.Superseded values are not recommended for survey control.
 HV1959
 HV1959.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1959.See file dsdata.pdf to determine how the superseded data were derived.
 HV1959
 HV1959_MARKER: DD = SURVEY DISK
 HV1959_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1959_SP_SET: BUILDING
 HV1959_STAMPING: NW 34
 HV1959_MARK LOGO: PBPP
 HV1959_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1959_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1959+SATELLITE: SATELLITE OBSERVATIONS - August 06, 2005
 HV1959
 HV1959  HISTORY     - Date     Condition        Report By
 HV1959  HISTORY     - UNK      MONUMENTED       PBPP
 HV1959  HISTORY     - 1926     GOOD             PBPP
 HV1959  HISTORY     - 1960     GOOD             CGS
 HV1959  HISTORY     - 1979     GOOD             NGS
 HV1959  HISTORY     - 20031220 GOOD             USPSQD
 HV1959  HISTORY     - 20050806 GOOD             GEOCAC
 HV1959
 HV1959                          STATION DESCRIPTION
 HV1959
 HV1959'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1959'AT WASHINGTON.
 HV1959'AT WASHINGTON, ON MASSACHUSETTS AVENUE NORTHWEST, 600 FEET
 HV1959'SOUTHWEST OF THE INTERSECTION OF NEBRASKA AVENUE NORTHWEST, AT
 HV1959'WARD CIRCLE, ON THE CAMPUS OF AMERICAN UNIVERSITY, AT HURST HALL
 HV1959'OF HISTORY (THE BUILDING NEAREST NEBRASKA AVENUE), IN THE EAST
 HV1959'GRANITE WALL, MIDWAY BETWEEN THE CORNERS OF THE BUILDING, BELOW
 HV1959'A BRONZE-LETTERED INSCRIPTION, AND 0.5 FOOT ABOVE THE SIDEWALK.
 HV1959'A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED NW 34
 HV1959'AND SET VERTICALLY.
 HV1959
 HV1959                          STATION RECOVERY (1960)
 HV1959
 HV1959'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1959'RECOVERED IN GOOD CONDITION.
 HV1959
 HV1959                          STATION RECOVERY (1979)
 HV1959
 HV1959'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1959'IN WESLEY HEIGHTS, 0.15 MILE SOUTHWEST ALONG LOUGHBORO ROAD
 HV1959'FROM WARD CIRCLE, SET VERTICALLY IN THE CENTER OF THE SOUTHEAST
 HV1959'FACE OF UNIVERSITY COLLEGE OF LIBERAL ARTS BUILDING, HURTS HALL,
 HV1959'14.3 FEET NORTHEAST OF THE CENTER OF A LARGE CATCH BASIN, 25.5 FEET
 HV1959'NORTHWEST OF A COMMEMORATIVE HEAD STONE FOR CAMP LEACH, 83.5 FEET
 HV1959'NORTHWEST OF THE NORTHWEST CURB OF LOUGHBORO ROAD.
 HV1959
 HV1959                          STATION RECOVERY (2003)
 HV1959
 HV1959'RECOVERY NOTE BY US POWER SQUADRON 2003 (CM)
 HV1959'RECOVERED IN GOOD CONDITION.
 HV1959
 HV1959                          STATION RECOVERY (2005)
 HV1959
 HV1959'RECOVERY NOTE BY GEOCACHING 2005 (APC)
 HV1959'LOCATED AS DESCRIBED, ON THE NEBRASKA AVENUE SIDE OF HURST HALL (NOTE
 HV1959'CORRECTED SPELLING). IT IS IN THE CENTER OF THE BUILDING, MORE OR LESS
 HV1959'DIRECTLY OPPOSITE PARKING LOT ENTRANCE ACROSS THE AVENUE. THE BRONZE
 HV1959'INSCRIPTION MENTIONED IN THE 1926 DESCRIPTION HAS BEEN REMOVED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1960 ***********************************************************************
 HV1960  DESIGNATION -  NW 35
 HV1960  PID         -  HV1960
 HV1960  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1960  COUNTRY     -  US
 HV1960  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1960
 HV1960                         *CURRENT SURVEY CONTROL
 HV1960  ______________________________________________________________________
 HV1960* NAD 83(1986) POSITION- 38 56 49.     (N) 077 05 55.     (W)   SCALED
 HV1960* NAVD 88 ORTHO HEIGHT -    77.071 (meters)      252.86  (feet) ADJUSTED
 HV1960  ______________________________________________________________________
 HV1960  GEOID HEIGHT    -        -31.915 (meters)                     GEOID18
 HV1960  DYNAMIC HEIGHT  -         77.029 (meters)      252.72  (feet) COMP
 HV1960  MODELED GRAVITY -    980,085.4   (mgal)                       NAVD 88
 HV1960
 HV1960  VERT ORDER      -  FIRST     CLASS II
 HV1960
 HV1960.The horizontal coordinates were scaled from a map and have
 HV1960.an estimated accuracy of +/- 6 seconds.
 HV1960
 HV1960.The orthometric height was determined by differential leveling and
 HV1960.adjusted by the NATIONAL GEODETIC SURVEY
 HV1960.in June 1991.
 HV1960
 HV1960.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1960.GEOID18 height accuracy estimate available here.
 HV1960
 HV1960.Click photographs - Photos may exist for this station.
 HV1960
 HV1960.The dynamic height is computed by dividing the NAVD 88
 HV1960.geopotential number by the normal gravity value computed on the
 HV1960.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1960.degrees latitude (g = 980.6199 gals.).
 HV1960
 HV1960.The modeled gravity was interpolated from observed gravity values.
 HV1960
 HV1960
 HV1960_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ181129(NAD 83)
 HV1960
 HV1960                          SUPERSEDED SURVEY CONTROL
 HV1960
 HV1960  NGVD 29 (11/26/84)   77.294  (m)          253.59   (f) ADJUSTED    1 2
 HV1960
 HV1960.Superseded values are not recommended for survey control.
 HV1960
 HV1960.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1960.See file dsdata.pdf to determine how the superseded data were derived.
 HV1960
 HV1960_MARKER: DD = SURVEY DISK
 HV1960_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1960_SP_SET: FOUNDATION WALL
 HV1960_STAMPING: NW 35
 HV1960_MARK LOGO: PBPP
 HV1960_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1960
 HV1960  HISTORY     - Date     Condition        Report By
 HV1960  HISTORY     - UNK      MONUMENTED       PBPP
 HV1960  HISTORY     - 1926     GOOD             PBPP
 HV1960  HISTORY     - 1960     GOOD             CGS
 HV1960
 HV1960                          STATION DESCRIPTION
 HV1960
 HV1960'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1960'AT WASHINGTON.
 HV1960'AT WASHINGTON, ON MASSACHUSETTS AVENUE NORTHWEST, 600 FEET
 HV1960'SOUTHEAST OF THE INTERSECTION OF WESTERN AVENUE, AT THE HOUSE AT
 HV1960'5047 MASSACHUSETTS AVENUE, IN THE NORTHWEST BRICK FOUNDATION WALL,
 HV1960'1 FOOT SOUTHWEST OF THE NORTH CORNER OF THE HOUSE, AND 0.5 FOOT
 HV1960'ABOVE THE GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD
 HV1960'DISK, SET VERTICALLY.
 HV1960
 HV1960                          STATION RECOVERY (1960)
 HV1960
 HV1960'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1960'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1961 ***********************************************************************
 HV1961  DESIGNATION -  NW 36
 HV1961  PID         -  HV1961
 HV1961  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1961  COUNTRY     -  US
 HV1961  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1961
 HV1961                         *CURRENT SURVEY CONTROL
 HV1961  ______________________________________________________________________
 HV1961* NAD 83(1986) POSITION- 38 57 17.     (N) 077 05 34.     (W)   SCALED
 HV1961* NAVD 88 ORTHO HEIGHT -    91.916 (meters)      301.56  (feet) ADJUSTED
 HV1961  ______________________________________________________________________
 HV1961  GEOID HEIGHT    -        -31.913 (meters)                     GEOID18
 HV1961  DYNAMIC HEIGHT  -         91.866 (meters)      301.40  (feet) COMP
 HV1961  MODELED GRAVITY -    980,084.6   (mgal)                       NAVD 88
 HV1961
 HV1961  VERT ORDER      -  SECOND    CLASS 0
 HV1961
 HV1961.The horizontal coordinates were scaled from a map and have
 HV1961.an estimated accuracy of +/- 6 seconds.
 HV1961
 HV1961.The orthometric height was determined by differential leveling and
 HV1961.adjusted by the NATIONAL GEODETIC SURVEY
 HV1961.in June 1991.
 HV1961
 HV1961.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1961.GEOID18 height accuracy estimate available here.
 HV1961
 HV1961.Click photographs - Photos may exist for this station.
 HV1961
 HV1961.The dynamic height is computed by dividing the NAVD 88
 HV1961.geopotential number by the normal gravity value computed on the
 HV1961.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1961.degrees latitude (g = 980.6199 gals.).
 HV1961
 HV1961.The modeled gravity was interpolated from observed gravity values.
 HV1961
 HV1961
 HV1961_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ186138(NAD 83)
 HV1961
 HV1961                          SUPERSEDED SURVEY CONTROL
 HV1961
 HV1961  NGVD 29 (11/26/84)   92.142  (m)          302.30   (f) ADJUSTED    2 0
 HV1961
 HV1961.Superseded values are not recommended for survey control.
 HV1961
 HV1961.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1961.See file dsdata.pdf to determine how the superseded data were derived.
 HV1961
 HV1961_MARKER: DD = SURVEY DISK
 HV1961_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1961_SP_SET: FOUNDATION WALL
 HV1961_STAMPING: NW 36
 HV1961_MARK LOGO: PBPP
 HV1961_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1961
 HV1961  HISTORY     - Date     Condition        Report By
 HV1961  HISTORY     - UNK      MONUMENTED       PBPP
 HV1961  HISTORY     - 1926     GOOD             PBPP
 HV1961  HISTORY     - 1960     GOOD             CGS
 HV1961
 HV1961                          STATION DESCRIPTION
 HV1961
 HV1961'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1961'AT WASHINGTON.
 HV1961'AT WASHINGTON, AT THE NORTHWEST CORNER OF THE INTERSECTION OF
 HV1961'FORTY-SEVENTH AND FESSENDEN STREETS NORTHWEST, AT A HOUSE, IN THE
 HV1961'EAST STONE FOUNDATION WALL, UNDER A BAY WINDOW FACING FORTY-SEVENTH
 HV1961'STREET, 10 INCHES SOUTH OF A CELLAR WINDOW, AND 0.5 FOOT ABOVE
 HV1961'THE GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK,
 HV1961'STAMPED NW 36 AND SET VERTICALLY.
 HV1961
 HV1961                          STATION RECOVERY (1960)
 HV1961
 HV1961'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1961'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1899 ***********************************************************************
 HV1899  DESIGNATION -  NW 37
 HV1899  PID         -  HV1899
 HV1899  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1899  COUNTRY     -  US
 HV1899  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1899
 HV1899                         *CURRENT SURVEY CONTROL
 HV1899  ______________________________________________________________________
 HV1899* NAD 83(1986) POSITION- 38 55 43.02   (N) 077 03 16.49   (W)   HD_HELD1
 HV1899* NAVD 88 ORTHO HEIGHT -    63.637 (meters)      208.78  (feet) ADJUSTED
 HV1899  ______________________________________________________________________
 HV1899  GEOID HEIGHT    -        -31.998 (meters)                     GEOID18
 HV1899  DYNAMIC HEIGHT  -         63.603 (meters)      208.67  (feet) COMP
 HV1899  MODELED GRAVITY -    980,089.5   (mgal)                       NAVD 88
 HV1899
 HV1899  VERT ORDER      -  SECOND    CLASS 0
 HV1899
 HV1899.The horizontal coordinates were determined by differentially corrected
 HV1899.hand held GPS observations or other comparable positioning techniques
 HV1899.and have an estimated accuracy of +/- 3 meters.
 HV1899
 HV1899.The orthometric height was determined by differential leveling and
 HV1899.adjusted by the NATIONAL GEODETIC SURVEY
 HV1899.in June 1991.
 HV1899
 HV1899.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1899.GEOID18 height accuracy estimate available here.
 HV1899
 HV1899.Click photographs - Photos may exist for this station.
 HV1899
 HV1899.The dynamic height is computed by dividing the NAVD 88
 HV1899.geopotential number by the normal gravity value computed on the
 HV1899.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1899.degrees latitude (g = 980.6199 gals.).
 HV1899
 HV1899.The modeled gravity was interpolated from observed gravity values.
 HV1899
 HV1899
 HV1899_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2190310862(NAD 83)
 HV1899
 HV1899                          SUPERSEDED SURVEY CONTROL
 HV1899
 HV1899  NGVD 29 (11/26/84)   63.864  (m)          209.53   (f) ADJUSTED    2 0
 HV1899
 HV1899.Superseded values are not recommended for survey control.
 HV1899
 HV1899.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1899.See file dsdata.pdf to determine how the superseded data were derived.
 HV1899
 HV1899_MARKER: DD = SURVEY DISK
 HV1899_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1899_SP_SET: BUILDING
 HV1899_STAMPING: NW 37
 HV1899_MARK LOGO: PBPP
 HV1899_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1899_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1899+SATELLITE: SATELLITE OBSERVATIONS - March 14, 2010
 HV1899
 HV1899  HISTORY     - Date     Condition        Report By
 HV1899  HISTORY     - UNK      MONUMENTED       PBPP
 HV1899  HISTORY     - 1926     GOOD             PBPP
 HV1899  HISTORY     - 1960     GOOD             CGS
 HV1899  HISTORY     - 20021024 GOOD             INDIV
 HV1899  HISTORY     - 20081204 GOOD             AMTHOM
 HV1899  HISTORY     - 20100314 GOOD             NGS
 HV1899
 HV1899                          STATION DESCRIPTION
 HV1899
 HV1899'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1899'AT WASHINGTON.
 HV1899'AT WASHINGTON, ON CONNECTICUT AVENUE, AT THE INTERSECTION OF
 HV1899'CATHEDRAL AVENUE NORTHWEST, 150 FEET NORTH OF THE CENTERLINE
 HV1899'OF CATHEDRAL AVENUE, AT THE SOUTHEAST CORNER OF CATHEDRAL
 HV1899'MANSIONS SOUTH, IN THE EAST BRICK WALL, 1 FOOT NORTH OF THE
 HV1899'SOUTHEAST CORNER OF THE BUILDING, AND ABOUT 1 FOOT ABOVE THE
 HV1899'GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK,
 HV1899'STAMPED NW 37 AND SET VERTICALLY.
 HV1899
 HV1899                          STATION RECOVERY (1960)
 HV1899
 HV1899'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1899'RECOVERED IN GOOD CONDITION.
 HV1899
 HV1899                          STATION RECOVERY (2002)
 HV1899
 HV1899'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 HV1899'RECOVERED IN GOOD CONDITION.
 HV1899
 HV1899                          STATION RECOVERY (2008)
 HV1899
 HV1899'RECOVERY NOTE BY A MORTON THOMAS AND ASSOCIATES 2008 (JAN)
 HV1899'RECOVERED IN GOOD CONDITION.
 HV1899
 HV1899                          STATION RECOVERY (2010)
 HV1899
 HV1899'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2010 (DRD)
 HV1899'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1900 ***********************************************************************
 HV1900  DESIGNATION -  NW 38 PBPP
 HV1900  PID         -  HV1900
 HV1900  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1900  COUNTRY     -  US
 HV1900  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1900
 HV1900                         *CURRENT SURVEY CONTROL
 HV1900  ______________________________________________________________________
 HV1900* NAD 83(1986) POSITION- 38 55 50.     (N) 077 03 21.     (W)   SCALED
 HV1900* NAVD 88 ORTHO HEIGHT -    67.62  (+/-2cm)      221.9   (feet) VERTCON3
 HV1900  ______________________________________________________________________
 HV1900  GEOID HEIGHT    -        -31.993 (meters)                     GEOID18
 HV1900  VERT ORDER      -  SECOND    CLASS II (See Below)
 HV1900
 HV1900.The horizontal coordinates were scaled from a map and have
 HV1900.an estimated accuracy of +/- 6 seconds.
 HV1900
 HV1900.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1900.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1900
 HV1900.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1900.GEOID18 height accuracy estimate available here.
 HV1900
 HV1900.The vertical order pertains to the NGVD 29 superseded value.
 HV1900
 HV1900.Click photographs - Photos may exist for this station.
 HV1900
 HV1900
 HV1900_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ217110(NAD 83)
 HV1900
 HV1900                          SUPERSEDED SURVEY CONTROL
 HV1900
 HV1900  NGVD 29 (11/26/84)   67.845  (m)          222.59   (f) ADJUSTED    2 2
 HV1900
 HV1900.Superseded values are not recommended for survey control.
 HV1900
 HV1900.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1900.See file dsdata.pdf to determine how the superseded data were derived.
 HV1900
 HV1900_MARKER: DD = SURVEY DISK
 HV1900_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1900_SP_SET: WATER TABLE
 HV1900_STAMPING: NW 38
 HV1900_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1900
 HV1900  HISTORY     - Date     Condition        Report By
 HV1900  HISTORY     - UNK      MONUMENTED       PBPP
 HV1900  HISTORY     - 1926     GOOD             PBPP
 HV1900  HISTORY     - 1943     GOOD             CGS
 HV1900  HISTORY     - 20081204 MARK NOT FOUND   AMTHOM
 HV1900
 HV1900                          STATION DESCRIPTION
 HV1900
 HV1900'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1900'AT WASHINGTON.
 HV1900'AT WASHINGTON, AT 3000 CONNECTICUT AVENUE, AT CATHEDRAL MANSIONS
 HV1900'NORTH, 7 FEET SOUTH OF THE DOOR, IN THE TOP OF THE WATER TABLE,
 HV1900'AND 0.5 FOOT FROM THE STONE WALL.  A PUBLIC BUILDINGS AND PUBLIC
 HV1900'PARKS STANDARD DISK, STAMPED NW 38.
 HV1900
 HV1900                          STATION RECOVERY (1943)
 HV1900
 HV1900'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943
 HV1900'RECOVERED IN GOOD CONDITION.
 HV1900
 HV1900                          STATION RECOVERY (2008)
 HV1900
 HV1900'RECOVERY NOTE BY A MORTON THOMAS AND ASSOCIATES 2008 (JAN)
 HV1900'STONE WALL NO LONGER EXISTS
 HV1900'NO STEM OR MARK OF DISK EVIDENT
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1881 ***********************************************************************
 HV1881  DESIGNATION -  NW 4
 HV1881  PID         -  HV1881
 HV1881  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1881  COUNTRY     -  US
 HV1881  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1881
 HV1881                         *CURRENT SURVEY CONTROL
 HV1881  ______________________________________________________________________
 HV1881* NAD 83(1986) POSITION- 38 53 59.     (N) 077 02 10.     (W)   SCALED
 HV1881* NAVD 88 ORTHO HEIGHT -    19.022 (meters)       62.41  (feet) ADJUSTED
 HV1881  ______________________________________________________________________
 HV1881  GEOID HEIGHT    -        -32.066 (meters)                     GEOID18
 HV1881  DYNAMIC HEIGHT  -         19.012 (meters)       62.38  (feet) COMP
 HV1881  MODELED GRAVITY -    980,097.9   (mgal)                       NAVD 88
 HV1881
 HV1881  VERT ORDER      -  FIRST     CLASS 0
 HV1881
 HV1881.The horizontal coordinates were scaled from a map and have
 HV1881.an estimated accuracy of +/- 6 seconds.
 HV1881
 HV1881.The orthometric height was determined by differential leveling and
 HV1881.adjusted by the NATIONAL GEODETIC SURVEY
 HV1881.in June 1991.
 HV1881
 HV1881.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1881.GEOID18 height accuracy estimate available here.
 HV1881
 HV1881.Click photographs - Photos may exist for this station.
 HV1881
 HV1881.The dynamic height is computed by dividing the NAVD 88
 HV1881.geopotential number by the normal gravity value computed on the
 HV1881.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1881.degrees latitude (g = 980.6199 gals.).
 HV1881
 HV1881.The modeled gravity was interpolated from observed gravity values.
 HV1881
 HV1881
 HV1881_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234076(NAD 83)
 HV1881
 HV1881                          SUPERSEDED SURVEY CONTROL
 HV1881
 HV1881  NGVD 29 (11/26/84)   19.255  (m)           63.17   (f) ADJUSTED    1 0
 HV1881
 HV1881.Superseded values are not recommended for survey control.
 HV1881
 HV1881.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1881.See file dsdata.pdf to determine how the superseded data were derived.
 HV1881
 HV1881_MARKER: DD = SURVEY DISK
 HV1881_SETTING: 34 = SET IN THE FOOTINGS OF SMALL/MEDIUM STRUCTURES
 HV1881_SP_SET: BLDG
 HV1881_STAMPING: NW 4
 HV1881_MARK LOGO: PBPP
 HV1881_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1881+STABILITY: SURFACE MOTION
 HV1881
 HV1881  HISTORY     - Date     Condition        Report By
 HV1881  HISTORY     - UNK      MONUMENTED       PBPP
 HV1881  HISTORY     - 1971     GOOD             NGS
 HV1881  HISTORY     - 1974     GOOD             NGS
 HV1881  HISTORY     - 1978     GOOD             NGS
 HV1881  HISTORY     - 1978     GOOD             NGS
 HV1881  HISTORY     - 1989     GOOD             USPSQD
 HV1881  HISTORY     - 20020812 MARK NOT FOUND   GEOCAC
 HV1881
 HV1881                          STATION DESCRIPTION
 HV1881
 HV1881'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1881'AT WASHINGTON.
 HV1881'AT WASHINGTON, D.C., IN THE NORTH SIDE OF LAFAYETTE PARK, 129
 HV1881'FEET EAST OF THE CENTER LINE OF 16TH STREET, SET IN THE TOP OF
 HV1881'THE EAST SIDE OF THE STONE LANDING AT THE SOUTH DOORWAY TO THE
 HV1881'PUBLIC REST ROOMS, 50.0 FEET SOUTH OF THE SOUTH CURB OF NW H
 HV1881'STREET, 3.9 FEET NORTH OF THE NORTH EDGE OF A BRICK SIDEWALK, 1.1
 HV1881'FEET SOUTH OF THE SOUTH FACE OF THE BUILDING, AND ABOUT 2 INCHES
 HV1881'ABOVE THE LEVEL OF THE GROUND.  NOTE-- THE STONE LANDING HAS
 HV1881'BEEN PARTIALLY COVERED WITH ASPHALT.
 HV1881
 HV1881                          STATION RECOVERY (1974)
 HV1881
 HV1881'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974
 HV1881'RECOVERED IN GOOD CONDITION.
 HV1881
 HV1881                          STATION RECOVERY (1978)
 HV1881
 HV1881'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV1881'RECOVERED IN GOOD CONDITION.
 HV1881
 HV1881                          STATION RECOVERY (1978)
 HV1881
 HV1881'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV1881'RECOVERED IN GOOD CONDITION.
 HV1881
 HV1881                          STATION RECOVERY (1989)
 HV1881
 HV1881'RECOVERY NOTE BY US POWER SQUADRON 1989 (NJP)
 HV1881'RECOVERED IN GOOD CONDITION.
 HV1881
 HV1881                          STATION RECOVERY (2002)
 HV1881
 HV1881'RECOVERY NOTE BY GEOCACHING 2002 (APC)
 HV1881'NOT VISIBLE BUT STATION DISK MAY UNDER PRESENT SURFACE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1901 ***********************************************************************
 HV1901  DESIGNATION -  NW 40
 HV1901  PID         -  HV1901
 HV1901  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1901  COUNTRY     -  US
 HV1901  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1901
 HV1901                         *CURRENT SURVEY CONTROL
 HV1901  ______________________________________________________________________
 HV1901* NAD 83(1986) POSITION- 38 56 11.2    (N) 077 03 32.3    (W)   HD_HELD2
 HV1901* NAVD 88 ORTHO HEIGHT -    64.034 (meters)      210.08  (feet) ADJUSTED
 HV1901  ______________________________________________________________________
 HV1901  GEOID HEIGHT    -        -31.981 (meters)                     GEOID18
 HV1901  DYNAMIC HEIGHT  -         63.999 (meters)      209.97  (feet) COMP
 HV1901  MODELED GRAVITY -    980,086.3   (mgal)                       NAVD 88
 HV1901
 HV1901  VERT ORDER      -  SECOND    CLASS 0
 HV1901
 HV1901.The horizontal coordinates were established by autonomous hand held GPS
 HV1901.observations and have an estimated accuracy of +/- 10 meters.
 HV1901
 HV1901.The orthometric height was determined by differential leveling and
 HV1901.adjusted by the NATIONAL GEODETIC SURVEY
 HV1901.in June 1991.
 HV1901
 HV1901.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1901.GEOID18 height accuracy estimate available here.
 HV1901
 HV1901.Click photographs - Photos may exist for this station.
 HV1901
 HV1901.The dynamic height is computed by dividing the NAVD 88
 HV1901.geopotential number by the normal gravity value computed on the
 HV1901.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1901.degrees latitude (g = 980.6199 gals.).
 HV1901
 HV1901.The modeled gravity was interpolated from observed gravity values.
 HV1901
 HV1901
 HV1901_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2154211739(NAD 83)
 HV1901
 HV1901                          SUPERSEDED SURVEY CONTROL
 HV1901
 HV1901  NGVD 29 (11/26/84)   64.262  (m)          210.83   (f) ADJUSTED    2 0
 HV1901
 HV1901.Superseded values are not recommended for survey control.
 HV1901
 HV1901.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1901.See file dsdata.pdf to determine how the superseded data were derived.
 HV1901
 HV1901_MARKER: DD = SURVEY DISK
 HV1901_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1901_SP_SET: BUILDING
 HV1901_STAMPING: NW 40
 HV1901_MARK LOGO: PBPP
 HV1901_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1901_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1901+SATELLITE: SATELLITE OBSERVATIONS - November 10, 2020
 HV1901
 HV1901  HISTORY     - Date     Condition        Report By
 HV1901  HISTORY     - UNK      MONUMENTED       PBPP
 HV1901  HISTORY     - 1926     GOOD             PBPP
 HV1901  HISTORY     - 1960     GOOD             CGS
 HV1901  HISTORY     - 20021024 GOOD             INDIV
 HV1901  HISTORY     - 20100314 GOOD             NGS
 HV1901  HISTORY     - 20201110 GOOD             NGS
 HV1901
 HV1901                          STATION DESCRIPTION
 HV1901
 HV1901'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1901'AT WASHINGTON.
 HV1901'AT WASHINGTON, ON CONNECTICUT AVENUE, NEAR THE INTERSECTION OF
 HV1901'PORTER STREET NORTHWEST, 170 FEET SOUTH OF THE CENTERLINE OF
 HV1901'PORTER STREET, AT FIRE STATION NO. 28, IN THE FRONT WALL, 4
 HV1901'FEET NORTH OF THE SOUTHEAST CORNER OF THE BUILDING, AND ABOUT
 HV1901'8 INCHES ABOVE THE GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS
 HV1901'STANDARD DISK, STAMPED NW 40 AND SET VERTICALLY.
 HV1901
 HV1901                          STATION RECOVERY (1960)
 HV1901
 HV1901'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1901'RECOVERED IN GOOD CONDITION.
 HV1901
 HV1901                          STATION RECOVERY (2002)
 HV1901
 HV1901'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 HV1901'RECOVERED IN GOOD CONDITION.
 HV1901
 HV1901                          STATION RECOVERY (2010)
 HV1901
 HV1901'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2010 (DRD)
 HV1901'RECOVERED IN GOOD CONDITION.
 HV1901
 HV1901                          STATION RECOVERY (2020)
 HV1901
 HV1901'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JH)
 HV1901'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1902 ***********************************************************************
 HV1902  DESIGNATION -  NW 41 PBPP
 HV1902  PID         -  HV1902
 HV1902  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1902  COUNTRY     -  US
 HV1902  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1902
 HV1902                         *CURRENT SURVEY CONTROL
 HV1902  ______________________________________________________________________
 HV1902* NAD 83(1986) POSITION- 38 56 35.     (N) 077 03 47.     (W)   SCALED
 HV1902* NAVD 88 ORTHO HEIGHT -    80.653 (meters)      264.61  (feet) ADJUSTED
 HV1902  ______________________________________________________________________
 HV1902  GEOID HEIGHT    -        -31.967 (meters)                     GEOID18
 HV1902  DYNAMIC HEIGHT  -         80.609 (meters)      264.46  (feet) COMP
 HV1902  MODELED GRAVITY -    980,083.6   (mgal)                       NAVD 88
 HV1902
 HV1902  VERT ORDER      -  SECOND    CLASS 0
 HV1902
 HV1902.The horizontal coordinates were scaled from a map and have
 HV1902.an estimated accuracy of +/- 6 seconds.
 HV1902
 HV1902.The orthometric height was determined by differential leveling and
 HV1902.adjusted by the NATIONAL GEODETIC SURVEY
 HV1902.in June 1991.
 HV1902
 HV1902.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1902.GEOID18 height accuracy estimate available here.
 HV1902
 HV1902.Click photographs - Photos may exist for this station.
 HV1902
 HV1902.The dynamic height is computed by dividing the NAVD 88
 HV1902.geopotential number by the normal gravity value computed on the
 HV1902.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1902.degrees latitude (g = 980.6199 gals.).
 HV1902
 HV1902.The modeled gravity was interpolated from observed gravity values.
 HV1902
 HV1902
 HV1902_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ212124(NAD 83)
 HV1902
 HV1902                          SUPERSEDED SURVEY CONTROL
 HV1902
 HV1902  NGVD 29 (11/26/84)   80.880  (m)          265.35   (f) ADJUSTED    2 0
 HV1902
 HV1902.Superseded values are not recommended for survey control.
 HV1902
 HV1902.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1902.See file dsdata.pdf to determine how the superseded data were derived.
 HV1902
 HV1902_MARKER: DD = SURVEY DISK
 HV1902_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1902_SP_SET: CURBSTONE
 HV1902_STAMPING: NW 41
 HV1902_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1902
 HV1902  HISTORY     - Date     Condition        Report By
 HV1902  HISTORY     - UNK      MONUMENTED       PBPP
 HV1902  HISTORY     - 1926     GOOD             PBPP
 HV1902  HISTORY     - 1960     GOOD             CGS
 HV1902
 HV1902                          STATION DESCRIPTION
 HV1902
 HV1902'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1902'AT WASHINGTON.
 HV1902'AT WASHINGTON, ON CONNECTICUT AVENUE, AT THE INTERSECTION OF
 HV1902'VAN NESS STREET NORTHWEST, 108 FEET FROM A FIRE HYDRANT AT
 HV1902'THE NORTHWEST CORNER OF THE INTERSECTION, AT THE MC DOWELL
 HV1902'BROTHERS SERVICE STATION, MIDWAY BETWEEN TWO LAMPPOSTS, 15
 HV1902'FEET WEST OF THE OUTER ROW OF PUMPS, AT THE WEST EDGE OF THE
 HV1902'DRIVEWAY, AND IN THE TOP OF THE CURBSTONE.  A PUBLIC BUILDINGS
 HV1902'AND PUBLIC PARKS STANDARD DISK, STAMPED NW 41.
 HV1902
 HV1902                          STATION RECOVERY (1960)
 HV1902
 HV1902'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1902'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1916 ***********************************************************************
 HV1916  DESIGNATION -  NW 43 PBPP
 HV1916  PID         -  HV1916
 HV1916  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1916  COUNTRY     -  US
 HV1916  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1916
 HV1916                         *CURRENT SURVEY CONTROL
 HV1916  ______________________________________________________________________
 HV1916* NAD 83(1986) POSITION- 38 57 34.37   (N) 077 04 22.04   (W)   HD_HELD1
 HV1916* NAVD 88 ORTHO HEIGHT -    98.832 (meters)      324.25  (feet) ADJUSTED
 HV1916  ______________________________________________________________________
 HV1916  GEOID HEIGHT    -        -31.934 (meters)                     GEOID18
 HV1916  DYNAMIC HEIGHT  -         98.778 (meters)      324.07  (feet) COMP
 HV1916  MODELED GRAVITY -    980,083.7   (mgal)                       NAVD 88
 HV1916
 HV1916  VERT ORDER      -  SECOND    CLASS 0
 HV1916
 HV1916.The horizontal coordinates were determined by differentially corrected
 HV1916.hand held GPS observations or other comparable positioning techniques
 HV1916.and have an estimated accuracy of +/- 3 meters.
 HV1916
 HV1916.The orthometric height was determined by differential leveling and
 HV1916.adjusted by the NATIONAL GEODETIC SURVEY
 HV1916.in June 1991.
 HV1916
 HV1916.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1916.GEOID18 height accuracy estimate available here.
 HV1916
 HV1916.Click photographs - Photos may exist for this station.
 HV1916
 HV1916.The dynamic height is computed by dividing the NAVD 88
 HV1916.geopotential number by the normal gravity value computed on the
 HV1916.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1916.degrees latitude (g = 980.6199 gals.).
 HV1916
 HV1916.The modeled gravity was interpolated from observed gravity values.
 HV1916
 HV1916
 HV1916_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2040314330(NAD 83)
 HV1916
 HV1916                          SUPERSEDED SURVEY CONTROL
 HV1916
 HV1916  NGVD 29 (11/26/84)   99.058  (m)          324.99   (f) ADJUSTED    2 0
 HV1916
 HV1916.Superseded values are not recommended for survey control.
 HV1916
 HV1916.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1916.See file dsdata.pdf to determine how the superseded data were derived.
 HV1916
 HV1916_MARKER: DD = SURVEY DISK
 HV1916_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1916_SP_SET: BUTTRESS
 HV1916_STAMPING: NW 43
 HV1916_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1916_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1916+SATELLITE: SATELLITE OBSERVATIONS - March 14, 2010
 HV1916
 HV1916  HISTORY     - Date     Condition        Report By
 HV1916  HISTORY     - UNK      MONUMENTED       PBPP
 HV1916  HISTORY     - 1926     GOOD             PBPP
 HV1916  HISTORY     - 1960     GOOD             CGS
 HV1916  HISTORY     - 20021020 GOOD             INDIV
 HV1916  HISTORY     - 20100314 GOOD             NGS
 HV1916
 HV1916                          STATION DESCRIPTION
 HV1916
 HV1916'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1916'AT WASHINGTON.
 HV1916'AT WASHINGTON, ON CONNECTICUT AVENUE, AT THE SOUTHWEST CORNER
 HV1916'OF THE INTERSECTION OF JOCELYN STREET NORTHWEST, AT THE
 HV1916'EAST SIDE OF WESLEY METHODIST CHURCH, IN THE EAST FACE OF THE
 HV1916'FOURTH BUTTRESS FROM THE NORTHEAST CORNER, 0.6 FOOT NORTH OF THE
 HV1916'SOUTH EDGE OF THE BUTTRESS, AND 0.3 FOOT ABOVE THE GROUND.
 HV1916'A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED W 43
 HV1916'AND SET VERTICALLY.
 HV1916
 HV1916                          STATION RECOVERY (1960)
 HV1916
 HV1916'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1916'RECOVERED IN GOOD CONDITION.
 HV1916
 HV1916                          STATION RECOVERY (2002)
 HV1916
 HV1916'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (CRA)
 HV1916'RECOVERED IN GOOD CONDITION.
 HV1916
 HV1916                          STATION RECOVERY (2010)
 HV1916
 HV1916'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2010 (DRD)
 HV1916'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2023 ***********************************************************************
 HV2023  DESIGNATION -  NW 45 PBPP
 HV2023  PID         -  HV2023
 HV2023  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2023  COUNTRY     -  US
 HV2023  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2023
 HV2023                         *CURRENT SURVEY CONTROL
 HV2023  ______________________________________________________________________
 HV2023* NAD 83(1986) POSITION- 38 57 39.     (N) 077 04 00.     (W)   SCALED
 HV2023* NAVD 88 ORTHO HEIGHT -    78.268 (meters)      256.78  (feet) ADJUSTED
 HV2023  ______________________________________________________________________
 HV2023  GEOID HEIGHT    -        -31.941 (meters)                     GEOID18
 HV2023  DYNAMIC HEIGHT  -         78.225 (meters)      256.64  (feet) COMP
 HV2023  MODELED GRAVITY -    980,084.2   (mgal)                       NAVD 88
 HV2023
 HV2023  VERT ORDER      -  SECOND    CLASS 0
 HV2023
 HV2023.The horizontal coordinates were scaled from a map and have
 HV2023.an estimated accuracy of +/- 6 seconds.
 HV2023
 HV2023.The orthometric height was determined by differential leveling and
 HV2023.adjusted by the NATIONAL GEODETIC SURVEY
 HV2023.in June 1991.
 HV2023
 HV2023.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2023.GEOID18 height accuracy estimate available here.
 HV2023
 HV2023.Click photographs - Photos may exist for this station.
 HV2023
 HV2023.The dynamic height is computed by dividing the NAVD 88
 HV2023.geopotential number by the normal gravity value computed on the
 HV2023.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2023.degrees latitude (g = 980.6199 gals.).
 HV2023
 HV2023.The modeled gravity was interpolated from observed gravity values.
 HV2023
 HV2023
 HV2023_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ209144(NAD 83)
 HV2023
 HV2023                          SUPERSEDED SURVEY CONTROL
 HV2023
 HV2023  NGVD 29 (11/26/84)   78.495  (m)          257.53   (f) ADJUSTED    2 0
 HV2023
 HV2023.Superseded values are not recommended for survey control.
 HV2023
 HV2023.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2023.See file dsdata.pdf to determine how the superseded data were derived.
 HV2023
 HV2023_MARKER: DD = SURVEY DISK
 HV2023_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2023_SP_SET: STEP
 HV2023_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2023
 HV2023  HISTORY     - Date     Condition        Report By
 HV2023  HISTORY     - UNK      MONUMENTED       PBPP
 HV2023  HISTORY     - 1971     GOOD             NGS
 HV2023
 HV2023                          STATION DESCRIPTION
 HV2023
 HV2023'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV2023'AT WASHINGTON.
 HV2023'AT WASHINGTON, AT THE INTERSECTION OF MILITARY ROAD, NEBRASKA
 HV2023'AVENUE AND BROAD BRANCH ROAD, 300 FEET SOUTH ALONG BROAD BRANCH
 HV2023'ROAD FROM THE INTERSECTION, IN THE REAR OF A TAN TAPESTRY BRICK
 HV2023'HOUSE, ON THE WEST SIDE OF THE STREET, NEAR LAMPPOST 1258, IN THE
 HV2023'TOP OF THE SECOND CELLAR STEP, AND NEAR THE WALL.  A PUBLIC
 HV2023'BUILDINGS AND PUBLIC PARKS STANDARD DISK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1896 ***********************************************************************
 HV1896  DESIGNATION -  NW 5
 HV1896  PID         -  HV1896
 HV1896  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1896  COUNTRY     -  US
 HV1896  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1896
 HV1896                         *CURRENT SURVEY CONTROL
 HV1896  ______________________________________________________________________
 HV1896* NAD 83(1986) POSITION- 38 54 06.99   (N) 077 02 19.98   (W)   HD_HELD1
 HV1896* NAVD 88 ORTHO HEIGHT -    19.491 (meters)       63.95  (feet) ADJUSTED
 HV1896  ______________________________________________________________________
 HV1896  GEOID HEIGHT    -        -32.059 (meters)                     GEOID18
 HV1896  DYNAMIC HEIGHT  -         19.481 (meters)       63.91  (feet) COMP
 HV1896  MODELED GRAVITY -    980,097.2   (mgal)                       NAVD 88
 HV1896
 HV1896  VERT ORDER      -  FIRST     CLASS II
 HV1896
 HV1896.The horizontal coordinates were determined by differentially corrected
 HV1896.hand held GPS observations or other comparable positioning techniques
 HV1896.and have an estimated accuracy of +/- 3 meters.
 HV1896
 HV1896.The orthometric height was determined by differential leveling and
 HV1896.adjusted by the NATIONAL GEODETIC SURVEY
 HV1896.in June 1991.
 HV1896
 HV1896.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1896.GEOID18 height accuracy estimate available here.
 HV1896
 HV1896.Click photographs - Photos may exist for this station.
 HV1896
 HV1896.The dynamic height is computed by dividing the NAVD 88
 HV1896.geopotential number by the normal gravity value computed on the
 HV1896.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1896.degrees latitude (g = 980.6199 gals.).
 HV1896
 HV1896.The modeled gravity was interpolated from observed gravity values.
 HV1896
 HV1896
 HV1896_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2319807871(NAD 83)
 HV1896
 HV1896                          SUPERSEDED SURVEY CONTROL
 HV1896
 HV1896  NGVD 29 (11/26/84)   19.737  (m)           64.75   (f) ADJUSTED    1 2
 HV1896
 HV1896.Superseded values are not recommended for survey control.
 HV1896
 HV1896.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1896.See file dsdata.pdf to determine how the superseded data were derived.
 HV1896
 HV1896_MARKER: DD = SURVEY DISK
 HV1896_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1896_SP_SET: STEP
 HV1896_STAMPING: NW 5
 HV1896_MARK LOGO: PBPP
 HV1896_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1896_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1896+SATELLITE: SATELLITE OBSERVATIONS - November 04, 2020
 HV1896
 HV1896  HISTORY     - Date     Condition        Report By
 HV1896  HISTORY     - UNK      MONUMENTED       PBPP
 HV1896  HISTORY     - 1926     GOOD             PBPP
 HV1896  HISTORY     - 1964     GOOD             CGS
 HV1896  HISTORY     - 20081009 GOOD             NGS
 HV1896  HISTORY     - 20201104 GOOD             NGS
 HV1896
 HV1896                          STATION DESCRIPTION
 HV1896
 HV1896'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1896'AT WASHINGTON.
 HV1896'AT WASHINGTON, NEAR THE INTERSECTION OF CONNECTICUT AVENUE AND
 HV1896'K STREET NORTHWEST, AT THE CENTER OF FARRAGUT SQUARE, AT THE
 HV1896'FARRAGUT MONUMENT, AT THE SOUTHEAST CORNER OF THE PEDESTAL,
 HV1896'IN THE TOP OF THE BOTTOM STEP, 30 INCHES NORTH OF THE SOUTH
 HV1896'EDGE OF THE STEP, 19 INCHES WEST OF THE EAST EDGE, AND IN THE
 HV1896'JOINT BETWEEN TWO STONES.  A PUBLIC BUILDINGS AND PUBLIC PARKS
 HV1896'STANDARD DISK, STAMPED NW 5.
 HV1896
 HV1896                          STATION RECOVERY (1964)
 HV1896
 HV1896'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1964
 HV1896'RECOVERED IN GOOD CONDITION.
 HV1896
 HV1896                          STATION RECOVERY (2008)
 HV1896
 HV1896'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DRD)
 HV1896'RECOVERED IN GOOD CONDITION.
 HV1896
 HV1896                          STATION RECOVERY (2020)
 HV1896
 HV1896'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JKH)
 HV1896'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1883 ***********************************************************************
 HV1883  DESIGNATION -  NW 6 RESET
 HV1883  PID         -  HV1883
 HV1883  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1883  COUNTRY     -  US
 HV1883  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1883
 HV1883                         *CURRENT SURVEY CONTROL
 HV1883  ______________________________________________________________________
 HV1883* NAD 83(1986) POSITION- 38 54 26.22   (N) 077 02 11.43   (W)   HD_HELD1
 HV1883* NAVD 88 ORTHO HEIGHT -    23.331 (meters)       76.55  (feet) ADJUSTED
 HV1883  ______________________________________________________________________
 HV1883  GEOID HEIGHT    -        -32.051 (meters)                     GEOID18
 HV1883  VERT ORDER      -  FIRST     CLASS II
 HV1883
 HV1883.The horizontal coordinates were determined by differentially corrected
 HV1883.hand held GPS observations or other comparable positioning techniques
 HV1883.and have an estimated accuracy of +/- 3 meters.
 HV1883
 HV1883.The orthometric height was determined by differential leveling and
 HV1883.adjusted by the NATIONAL GEODETIC SURVEY
 HV1883.in June 1991.
 HV1883
 HV1883.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1883.GEOID18 height accuracy estimate available here.
 HV1883
 HV1883.Click photographs - Photos may exist for this station.
 HV1883
 HV1883
 HV1883_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2341708459(NAD 83)
 HV1883
 HV1883                          SUPERSEDED SURVEY CONTROL
 HV1883
 HV1883  NGVD 29 (11/26/84)   23.578  (m)           77.36   (f) ADJUSTED    1 2
 HV1883
 HV1883.Superseded values are not recommended for survey control.
 HV1883
 HV1883.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1883.See file dsdata.pdf to determine how the superseded data were derived.
 HV1883
 HV1883_MARKER: DD = SURVEY DISK
 HV1883_SETTING: 35 = SET IN A MAT FOUNDATION OR CONCRETE SLAB OTHER THAN
 HV1883+WITH SETTING: PAVEMENT
 HV1883_SP_SET: STONE BASE
 HV1883_STAMPING: NW 6 RESET
 HV1883_MARK LOGO: PBPP
 HV1883_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1883+STABILITY: SURFACE MOTION
 HV1883_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1883+SATELLITE: SATELLITE OBSERVATIONS - May 29, 2003
 HV1883
 HV1883  HISTORY     - Date     Condition        Report By
 HV1883  HISTORY     - UNK      MONUMENTED       PBPP
 HV1883  HISTORY     - 1946     GOOD             CGS
 HV1883  HISTORY     - 1964     GOOD             CGS
 HV1883  HISTORY     - 1989     GOOD             USPSQD
 HV1883  HISTORY     - 20030529 GOOD             GEOCAC
 HV1883  HISTORY     - 20100314 GOOD             GEOCAC
 HV1883  HISTORY     - 20160513 GOOD             INDIV
 HV1883  HISTORY     - 20201104 GOOD             NGS
 HV1883
 HV1883                          STATION DESCRIPTION
 HV1883
 HV1883'DESCRIBED BY COAST AND GEODETIC SURVEY 1946
 HV1883'AT WASHINGTON.
 HV1883'AT WASHINGTON, ON SIXTEENTH STREET NORTHWEST, AT SCOTT CIRCLE,
 HV1883'AT THE STATUE OF GENERAL SCOTT, IN THE TOP OF THE STONE BASE,
 HV1883'AND 4 FEET WEST OF THE NORTHEAST CORNER.  A PUBLIC BUILDINGS
 HV1883'AND PUBLIC PARKS STANDARD DISK, STAMPED NW 6 RESET.  NOTE-- THIS
 HV1883'STATUE WAS REMOVED IN FEBRUARY 1941 TO ALLOW CONSTRUCTION OF THE
 HV1883'SCOTT CIRCLE UNDERPASS, AND REPLACED AT A LATER DATE.
 HV1883
 HV1883                          STATION RECOVERY (1964)
 HV1883
 HV1883'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1964
 HV1883'RECOVERED IN GOOD CONDITION.
 HV1883
 HV1883                          STATION RECOVERY (1989)
 HV1883
 HV1883'RECOVERY NOTE BY US POWER SQUADRON 1989 (MJP)
 HV1883'RECOVERED IN GOOD CONDITION.
 HV1883
 HV1883                          STATION RECOVERY (2003)
 HV1883
 HV1883'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV1883'RECOVERED IN GOOD CONDITION.
 HV1883
 HV1883                          STATION RECOVERY (2010)
 HV1883
 HV1883'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 HV1883'RECOVERED IN GOOD CONDITION.
 HV1883
 HV1883                          STATION RECOVERY (2016)
 HV1883
 HV1883'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2016 (JFS)
 HV1883'RECOVERED AS DESCRIBED
 HV1883
 HV1883                          STATION RECOVERY (2020)
 HV1883
 HV1883'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JKH)
 HV1883'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1884 ***********************************************************************
 HV1884  DESIGNATION -  NW 8
 HV1884  PID         -  HV1884
 HV1884  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1884  COUNTRY     -  US
 HV1884  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1884
 HV1884                         *CURRENT SURVEY CONTROL
 HV1884  ______________________________________________________________________
 HV1884* NAD 83(1986) POSITION- 38 54 48.16   (N) 077 02 10.50   (W)   HD_HELD1
 HV1884* NAVD 88 ORTHO HEIGHT -    27.57  (+/-2cm)       90.5   (feet) VERTCON3
 HV1884  ______________________________________________________________________
 HV1884  GEOID HEIGHT    -        -32.041 (meters)                     GEOID18
 HV1884  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1884
 HV1884.The horizontal coordinates were determined by differentially corrected
 HV1884.hand held GPS observations or other comparable positioning techniques
 HV1884.and have an estimated accuracy of +/- 3 meters.
 HV1884
 HV1884.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1884.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1884
 HV1884.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1884.GEOID18 height accuracy estimate available here.
 HV1884
 HV1884.The vertical order pertains to the NGVD 29 superseded value.
 HV1884
 HV1884.Click photographs - Photos may exist for this station.
 HV1884
 HV1884
 HV1884_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2345409135(NAD 83)
 HV1884
 HV1884                          SUPERSEDED SURVEY CONTROL
 HV1884
 HV1884  NGVD 29 (11/26/84)   27.806  (m)           91.23   (f) ADJUSTED    1 2
 HV1884
 HV1884.Superseded values are not recommended for survey control.
 HV1884
 HV1884.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1884.See file dsdata.pdf to determine how the superseded data were derived.
 HV1884
 HV1884_MARKER: DB = BENCH MARK DISK
 HV1884_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1884_SP_SET: STEP
 HV1884_STAMPING: NW 8
 HV1884_MARK LOGO: PBPP
 HV1884_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1884_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1884+SATELLITE: SATELLITE OBSERVATIONS - November 12, 2011
 HV1884
 HV1884  HISTORY     - Date     Condition        Report By
 HV1884  HISTORY     - UNK      MONUMENTED       PBPP
 HV1884  HISTORY     - 1926     GOOD             PBPP
 HV1884  HISTORY     - 1943     GOOD             CGS
 HV1884  HISTORY     - 20111112 GOOD             NGS
 HV1884
 HV1884                          STATION DESCRIPTION
 HV1884
 HV1884'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1884'AT WASHINGTON.
 HV1884'AT WASHINGTON, ON SIXTEENTH STREET NORTHWEST, AT THE INTERSECTION
 HV1884'OF S STREET NORTHWEST, AT THE SOUTHWEST CORNER OF THE SCOTTIST
 HV1884'RITE TEMPLE, AT THE SOUTHEAST CORNER OF THE FRONT STEPS, AND
 HV1884'IN THE TOP OF THE SECOND LOWEST STEP.  A PUBLIC BUILDINGS AND
 HV1884'PUBLIC PARKS STANDARD DISK, STAMPED NW 8.
 HV1884
 HV1884                          STATION RECOVERY (1943)
 HV1884
 HV1884'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943
 HV1884'RECOVERED IN GOOD CONDITION.
 HV1884
 HV1884                          STATION RECOVERY (2011)
 HV1884
 HV1884'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2011 (DRD)
 HV1884'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1897 ***********************************************************************
 HV1897  DESIGNATION -  NW 9 PBPP
 HV1897  PID         -  HV1897
 HV1897  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1897  COUNTRY     -  US
 HV1897  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1897
 HV1897                         *CURRENT SURVEY CONTROL
 HV1897  ______________________________________________________________________
 HV1897* NAD 83(1986) POSITION- 38 54 52.     (N) 077 02 45.     (W)   SCALED
 HV1897* NAVD 88 ORTHO HEIGHT -    34.86  (+/-2cm)      114.4   (feet) VERTCON3
 HV1897  ______________________________________________________________________
 HV1897  GEOID HEIGHT    -        -32.029 (meters)                     GEOID18
 HV1897  VERT ORDER      -  SECOND    CLASS I (See Below)
 HV1897
 HV1897.The horizontal coordinates were scaled from a map and have
 HV1897.an estimated accuracy of +/- 6 seconds.
 HV1897
 HV1897.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1897.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1897
 HV1897.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1897.GEOID18 height accuracy estimate available here.
 HV1897
 HV1897.The vertical order pertains to the NGVD 29 superseded value.
 HV1897
 HV1897.Click photographs - Photos may exist for this station.
 HV1897
 HV1897
 HV1897_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ226092(NAD 83)
 HV1897
 HV1897                          SUPERSEDED SURVEY CONTROL
 HV1897
 HV1897  NGVD 29 (11/26/84)   35.088  (m)          115.12   (f) ADJUSTED    2 1
 HV1897
 HV1897.Superseded values are not recommended for survey control.
 HV1897
 HV1897.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1897.See file dsdata.pdf to determine how the superseded data were derived.
 HV1897
 HV1897_MARKER: DD = SURVEY DISK
 HV1897_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1897_SP_SET: STONE WALL
 HV1897_STAMPING: NW 9
 HV1897_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1897
 HV1897  HISTORY     - Date     Condition        Report By
 HV1897  HISTORY     - UNK      MONUMENTED       PBPP
 HV1897  HISTORY     - 1926     GOOD             PBPP
 HV1897  HISTORY     - 1943     MARK NOT FOUND   CGS
 HV1897  HISTORY     - 20060327 MARK NOT FOUND   GEOCAC
 HV1897
 HV1897                          STATION DESCRIPTION
 HV1897
 HV1897'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1897'AT WASHINGTON.
 HV1897'AT WASHINGTON, ON CONNECTICUT AVENUE, AT THE NORTHEAST CORNER
 HV1897'OF THE INTERSECTION OF FLORIDA AVENUE NORTHWEST, IN A STONE
 HV1897'WALL SURROUNDING THE OLD MASONIC TEMPLE GROUNDS, 17.4 FEET
 HV1897'NORTHWEST OF THE CURB OF FLORIDA AVENUE, 16 FEET FROM A FIRE
 HV1897'HYDRANT, 11.5 FEET NORTHEAST OF THE POINT OF CURVE OF THE WALL,
 HV1897'3.1 FEET BELOW THE COPING ON TOP OF THE WALL, AND 0.5 FOOT ABOVE
 HV1897'THE GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD
 HV1897'DISK, STAMPED NW 9 AND SET VERTICALLY.
 HV1897
 HV1897                          STATION RECOVERY (1943)
 HV1897
 HV1897'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943
 HV1897'MARK NOT FOUND.
 HV1897
 HV1897                          STATION RECOVERY (2006)
 HV1897
 HV1897'RECOVERY NOTE BY GEOCACHING 2006 (APC)
 HV1897'AREA HAS BEEN COMPLETELY REDEVELOPED IN INTERVENING DECADES. THERE IS
 HV1897'NO STONE WALL AT THE NORTHEAST CORNER OF FLORIDA AND CONNECTICUT
 HV1897'AVENUES.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4057 ***********************************************************************
 HV4057  DESIGNATION -  OAK 1913
 HV4057  PID         -  HV4057
 HV4057  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4057  COUNTRY     -  US
 HV4057  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4057
 HV4057                         *CURRENT SURVEY CONTROL
 HV4057  ______________________________________________________________________
 HV4057* NAD 83(1993) POSITION- 38 55 20.84114(N) 077 06 10.26575(W)   ADJUSTED
 HV4057* NAVD 88 ORTHO HEIGHT -    35.    (meters)      115.    (feet) SCALED
 HV4057  ______________________________________________________________________
 HV4057  GEOID HEIGHT    -        -31.943 (meters)                     GEOID18
 HV4057  LAPLACE CORR    -         -2.12  (seconds)                    DEFLEC18
 HV4057  HORZ ORDER      -  THIRD
 HV4057
 HV4057.The horizontal coordinates were established by classical geodetic methods
 HV4057.and adjusted by the National Geodetic Survey in November 1994.
 HV4057
 HV4057.The orthometric height was scaled from a topographic map.
 HV4057
 HV4057.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4057.GEOID18 height accuracy estimate available here.
 HV4057
 HV4057.Click photographs - Photos may exist for this station.
 HV4057
 HV4057.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4057
 HV4057. The following values were computed from the NAD 83(1993) position.
 HV4057
 HV4057;                    North         East     Units Scale Factor Converg.
 HV4057;SPC MD       -   139,403.113   391,081.065   MT  0.99995018   -0 03 52.4
 HV4057;SPC MD       -   457,358.38  1,283,071.79   sFT  0.99995018   -0 03 52.4
 HV4057;SPC VA N     - 2,140,314.902 3,621,152.718   MT  0.99996251   +0 52 19.1
 HV4057;SPC VA N     - 7,022,016.47 11,880,398.54   sFT  0.99996251   +0 52 19.1
 HV4057;UTM  18      - 4,310,273.757   317,703.095   MT  1.00000922   -1 19 17.5
 HV4057
 HV4057!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4057!SPC MD       -   0.99999956  x   0.99995018  =   0.99994974
 HV4057!SPC VA N     -   0.99999956  x   0.99996251  =   0.99996207
 HV4057!UTM  18      -   0.99999956  x   1.00000922  =   1.00000878
 HV4057
 HV4057:                Primary Azimuth Mark                     Grid Az
 HV4057:SPC MD       -  SAND                                     230 59 31.6
 HV4057:SPC VA N     -  SAND                                     230 03 20.1
 HV4057:UTM  18      -  SAND                                     232 14 56.7
 HV4057
 HV4057_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1770310273(NAD 83)
 HV4057
 HV4057|---------------------------------------------------------------------|
 HV4057| PID    Reference Object                     Distance      Geod. Az  |
 HV4057|                                                           dddmmss.s |
 HV4057| HV4374 WM                                  APPROX. 0.5 KM 1404441.7 |
 HV4057| HV3077 SAND                                448.747 METERS 2305539.2 |
 HV4057| HV4372 STAFF                               248.117 METERS 32534     |
 HV4057| HV4371 REFORM SCHOOL TANK                  APPROX. 1.6 KM 3465038.6 |
 HV4057|---------------------------------------------------------------------|
 HV4057
 HV4057                          SUPERSEDED SURVEY CONTROL
 HV4057
 HV4057  NAD 83(1991)-  38 55 20.84001(N)    077 06 10.26738(W) AD(       ) 3
 HV4057  NAD 83(1986)-  38 55 20.83993(N)    077 06 10.27755(W) AD(       ) 3
 HV4057  NAD 27      -  38 55 20.44000(N)    077 06 11.34800(W) AD(       ) 3
 HV4057  USSD        -  38 55 20.77700(N)    077 06 11.17900(W) AD(       ) 3
 HV4057
 HV4057.Superseded values are not recommended for survey control.
 HV4057
 HV4057.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4057.See file dsdata.pdf to determine how the superseded data were derived.
 HV4057
 HV4057_MARKER: DS = TRIANGULATION STATION DISK
 HV4057_SETTING: 80 = SET IN A BOULDER
 HV4057_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV4057+STABILITY: SURFACE MOTION
 HV4057
 HV4057  HISTORY     - Date     Condition        Report By
 HV4057  HISTORY     - 1913     MONUMENTED       CGS
 HV4057  HISTORY     - 1925     GOOD             CGS
 HV4057  HISTORY     - 1935     SEE DESCRIPTION  CGS
 HV4057
 HV4057                          STATION DESCRIPTION
 HV4057
 HV4057'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4057'STATION IS ON THE BROW OF A PROMINENT HILL ABOUT 1/2 MILE NW
 HV4057'OF THE DISTRIBUTING RESERVOIR IN GEORGETOWN AND NEARLY A
 HV4057'MILE SE OF THE CHAIN BRIDGE.  IT IS ABOUT 100 METERS W OF THE
 HV4057'ELECTRIC RAILROAD AND 100 METERS S OF A PROMINENT TRAIL FROM
 HV4057'THE RAILROAD TO THE CANAL ROAD BEING A CONTINUATION OF A ROAD
 HV4057'WHICH ENDS AT THE CAR TRACKS.  THERE IS A LARGE OAK TREE
 HV4057'ABOUT 3 FEET IN DIAMETER DISTANT 15 FEET N FROM THE STATION.
 HV4057'THE SUBSURFACE MARK IS 3/4-INCH DRILL HOLE SURROUNDED BY A
 HV4057'TRIANGLE CUT IN THE TOP OF A LARGE BOULDER SET ABOUT 1 FOOT
 HV4057'BELOW THE SURFACE OF THE GROUND.  THE SURFACE MARK IS A
 HV4057'REGULAR C. AND G.S. STATION MARK SET IN THE TOP OF A LARGE
 HV4057'BOULDER AND IS SLIGHTLY ABOVE THE SURFACE OF THE GROUND.
 HV4057
 HV4057                          STATION RECOVERY (1925)
 HV4057
 HV4057'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1925 (GLB)
 HV4057'STATION FOUND AS DESCRIBED.
 HV4057
 HV4057                          STATION RECOVERY (1935)
 HV4057
 HV4057'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4057'STATION BELIEVED TO BE RECOVERED.  THE STONE WITH THE STATION
 HV4057'MARK IN PLACE WAS FOUND LYING LOOSE ON THE GROUND BUT THE
 HV4057'SUBSURFACE MARK WAS FOUND TO BE IN PLACE.  THE LARGE OAK
 HV4057'TREE REFERRED TO IN THE ORIGINAL DESCRIPTION HAS FALLEN DOWN
 HV4057'DIRECTLY ACROSS THE MARK.  A NEW STATION OAK 2, WAS ESTABLISHED
 HV4057'25.850 METERS TO THE SW OF THE STATION AND OAK TIED IN BY A
 HV4057'TRAVERSE MEASUREMENT.  THE SURFACE MARK WAS NOT REPLACED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4049 ***********************************************************************
 HV4049  DESIGNATION -  OAK 2
 HV4049  PID         -  HV4049
 HV4049  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4049  COUNTRY     -  US
 HV4049  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4049
 HV4049                         *CURRENT SURVEY CONTROL
 HV4049  ______________________________________________________________________
 HV4049* NAD 83(1993) POSITION- 38 55 20.40036(N) 077 06 09.35293(W)   ADJUSTED
 HV4049* NAVD 88 ORTHO HEIGHT -    35.    (meters)      115.    (feet) SCALED
 HV4049  ______________________________________________________________________
 HV4049  GEOID HEIGHT    -        -31.943 (meters)                     GEOID18
 HV4049  LAPLACE CORR    -         -2.12  (seconds)                    DEFLEC18
 HV4049  HORZ ORDER      -  SECOND
 HV4049
 HV4049.The horizontal coordinates were established by classical geodetic methods
 HV4049.and adjusted by the National Geodetic Survey in November 1994.
 HV4049
 HV4049.The orthometric height was scaled from a topographic map.
 HV4049
 HV4049.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4049.GEOID18 height accuracy estimate available here.
 HV4049
 HV4049.Click photographs - Photos may exist for this station.
 HV4049
 HV4049.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4049
 HV4049. The following values were computed from the NAD 83(1993) position.
 HV4049
 HV4049;                    North         East     Units Scale Factor Converg.
 HV4049;SPC MD       -   139,389.496   391,103.038   MT  0.99995018   -0 03 51.8
 HV4049;SPC MD       -   457,313.70  1,283,143.88   sFT  0.99995018   -0 03 51.8
 HV4049;SPC VA N     - 2,140,301.647 3,621,174.911   MT  0.99996250   +0 52 19.7
 HV4049;SPC VA N     - 7,021,972.99 11,880,471.35   sFT  0.99996250   +0 52 19.7
 HV4049;UTM  18      - 4,310,259.661   317,724.765   MT  1.00000913   -1 19 16.9
 HV4049
 HV4049!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4049!SPC MD       -   0.99999956  x   0.99995018  =   0.99994974
 HV4049!SPC VA N     -   0.99999956  x   0.99996250  =   0.99996206
 HV4049!UTM  18      -   0.99999956  x   1.00000913  =   1.00000869
 HV4049
 HV4049:                Primary Azimuth Mark                     Grid Az
 HV4049:SPC MD       -  BATTERY                                  032 30 40.2
 HV4049:SPC VA N     -  BATTERY                                  031 34 28.7
 HV4049:UTM  18      -  BATTERY                                  033 46 05.3
 HV4049
 HV4049_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1772410259(NAD 83)
 HV4049
 HV4049|---------------------------------------------------------------------|
 HV4049| PID    Reference Object                     Distance      Geod. Az  |
 HV4049|                                                           dddmmss.s |
 HV4049| HV3985 BATTERY                             APPROX. 1.1 KM 0322648.4 |
 HV4049| DC6981 OAK 2 RM 1                           14.400 METERS 10057     |
 HV4049| HV3077 SAND                                457.903 METERS 2335901.6 |
 HV4049| HV4057 OAK 1913                             25.851 METERS 30143     |
 HV4049|---------------------------------------------------------------------|
 HV4049
 HV4049                          SUPERSEDED SURVEY CONTROL
 HV4049
 HV4049  NAD 83(1991)-  38 55 20.39923(N)    077 06 09.35456(W) AD(       ) 2
 HV4049  NAD 83(1986)-  38 55 20.39904(N)    077 06 09.36448(W) AD(       ) 2
 HV4049  NAD 27      -  38 55 19.99900(N)    077 06 10.43500(W) AD(       ) 2
 HV4049
 HV4049.Superseded values are not recommended for survey control.
 HV4049
 HV4049.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4049.See file dsdata.pdf to determine how the superseded data were derived.
 HV4049
 HV4049_MARKER: DS = TRIANGULATION STATION DISK
 HV4049_SETTING: 0 = UNSPECIFIED SETTING
 HV4049
 HV4049  HISTORY     - Date     Condition        Report By
 HV4049  HISTORY     - 1935     MONUMENTED       CGS
 HV4049  HISTORY     - 1938     GOOD             CGS
 HV4049  HISTORY     - 1946     GOOD             CGS
 HV4049  HISTORY     - 1971     GOOD             NGS
 HV4049
 HV4049                          STATION DESCRIPTION
 HV4049
 HV4049'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4049'STATION IS ON A PROMINENT HILL ABOUT 1/2 MILE NW OF THE
 HV4049'DISTRIBUTING RESERVOIR IN GEORGETOWN AND NEARLY 1 MILE SE OF THE
 HV4049'CHAIN BRIDGE ACROSS THE POTOMAC RIVER.  IT IS ABOUT 75 YARDS W OF
 HV4049'THE ELECTRIC RAILROAD AND ABOUT 100 YARDS S OF A DIRT ROAD WHICH
 HV4049'IS A CONTINUATION OF CHAIN BRIDGE ROAD BETWEEN CONDUIT ROAD AND
 HV4049'CANAL ROAD.
 HV4049'
 HV4049'STATION MARK AND SUBSURFACE MARK SET IN CONCRETE POSTS.
 HV4049'
 HV4049'REFERENCE MARK SET IN CONCRETE POST.
 HV4049'
 HV4049'TO REACH STATION GO OUT CONDUIT ROAD TO CHAIN BRIDGE ROAD AND
 HV4049'TURN LEFT ONTO STREET GOING DOWNHILL.  ABOUT 1/2 BLOCK FROM
 HV4049'CONDUIT ROAD THE STREET FORKS, THE LEFT HAND ONE HAVING A SIGN NO
 HV4049'THROUGH STREET.  TAKE THIS LEFT HAND STREET, AND GO TO STREET
 HV4049'CAR TRACKS.  FOLLOW PATH LEADING SW FROM THE INTERSECTION OF THE
 HV4049'STREET AND THE CAR TRACKS FOR ABOUT 100 YARDS TO STATION.
 HV4049'
 HV4049'HEIGHT OF LIGHT ABOVE STATION MARK - 19.5 METERS.
 HV4049
 HV4049                          STATION RECOVERY (1938)
 HV4049
 HV4049'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4049'STATION MARK RECOVERED.  OTHER MARKS NOT SEARCHED FOR.
 HV4049
 HV4049                          STATION RECOVERY (1946)
 HV4049
 HV4049'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4049'LAST SENTENCE OF DESCRIPTION SHOULD READ--FOLLOW ROAD LEADING SW
 HV4049'FROM THE INTERSECTION OF THE STREET AND THE CAR TRACKS TO A
 HV4049'TWO-STORY FRAME HOUSE.  STATION IS 65 FEET NW OF THE W CORNER
 HV4049'OF HOUSE.  OTHERWISE, RECOVERED AS DESCRIBED AND FOUND TO BE IN
 HV4049'GOOD CONDITION.
 HV4049
 HV4049                          STATION RECOVERY (1971)
 HV4049
 HV4049'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4049'STATION AND REFERENCE MARK RECOVERED AS DESCRIBED AND FOUND TO BE
 HV4049'IN GOOD CONDITION.  FOLLOWING ARE SOME ADDITIONAL NOTES AND
 HV4049'MEASUREMENTS IN RECOVERY OF THE STATION--
 HV4049'
 HV4049'THE STATION IS IN A LAWN, 85 FEET NORTHEAST OF WHERE THE HILL
 HV4049'BRAKES SHAPE TO THE WEST, 47 FEET EAST OF WHERE HILL STARTS BRAKE
 HV4049'FOR SLOPE TO THE WEST, 66.3 FEET WEST OF THE WEST CORNER OF HOUSE
 HV4049'NO. 2309, AND 8.0 FEET SOUTH OF THE WEST END OF A STONE WALL,
 HV4049'MARKING THE PROPERTY BOUNDARY.  THE MARK IS FLUSH WITH SURFACE OF
 HV4049'GROUND AND THE DISK IS OAK 2 1935.
 HV4049'
 HV4049'REFERENCE MARK NO. 1 IS IN THE YARD OF HOUSE NO. 2309, PROJECTS
 HV4049'4-INCHES ABOVE SURFACE OF GROUND, AND IS 19.2 FEET WEST OF THE
 HV4049'WEST CORNER OF HOUSE.  IT IS STAMPED OAK 2 NO 1 1935.
 HV4049'
 HV4049'THE GENERAL LOCATION DESCRIPTION AND TO REACH DESCRIPTION IS
 HV4049'ADEQUATE.
 HV4049'
 HV4049'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN-- IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4355 ***********************************************************************
 HV4355  DESIGNATION -  OB 1913
 HV4355  PID         -  HV4355
 HV4355  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4355  COUNTRY     -  US
 HV4355  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4355
 HV4355                         *CURRENT SURVEY CONTROL
 HV4355  ______________________________________________________________________
 HV4355* NAD 83(1993) POSITION- 38 53 26.74936(N) 077 03 13.42768(W)   ADJUSTED
 HV4355* NAVD 88 ORTHO HEIGHT -     2.    (meters)        7.    (feet) SCALED
 HV4355  ______________________________________________________________________
 HV4355  GEOID HEIGHT    -        -32.063 (meters)                     GEOID18
 HV4355  LAPLACE CORR    -         -2.54  (seconds)                    DEFLEC18
 HV4355  HORZ ORDER      -  THIRD
 HV4355
 HV4355.The horizontal coordinates were established by classical geodetic methods
 HV4355.and adjusted by the National Geodetic Survey in November 1994.
 HV4355
 HV4355.The orthometric height was scaled from a topographic map.
 HV4355
 HV4355.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4355.GEOID18 height accuracy estimate available here.
 HV4355
 HV4355.Click photographs - Photos may exist for this station.
 HV4355
 HV4355.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4355
 HV4355. The following values were computed from the NAD 83(1993) position.
 HV4355
 HV4355;                    North         East     Units Scale Factor Converg.
 HV4355;SPC MD       -   135,881.372   395,338.657   MT  0.99994988   -0 02 01.4
 HV4355;SPC MD       -   445,804.13  1,297,040.24   sFT  0.99994988   -0 02 01.4
 HV4355;SPC VA N     - 2,136,863.177 3,625,467.346   MT  0.99995973   +0 54 09.5
 HV4355;SPC VA N     - 7,010,691.94 11,894,554.12   sFT  0.99995973   +0 54 09.5
 HV4355;UTM  18      - 4,306,659.322   321,882.646   MT  0.99999068   -1 17 23.1
 HV4355
 HV4355!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4355!SPC MD       -   1.00000475  x   0.99994988  =   0.99995463
 HV4355!SPC VA N     -   1.00000475  x   0.99995973  =   0.99996448
 HV4355!UTM  18      -   1.00000475  x   0.99999068  =   0.99999543
 HV4355
 HV4355_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2188206659(NAD 83)
 HV4355
 HV4355                          SUPERSEDED SURVEY CONTROL
 HV4355
 HV4355  NAD 83(1991)-  38 53 26.74812(N)    077 03 13.42922(W) AD(       ) 3
 HV4355  NAD 83(1986)-  38 53 26.74784(N)    077 03 13.43973(W) AD(       ) 3
 HV4355  NAD 27      -  38 53 26.34900(N)    077 03 14.51700(W) AD(       ) 3
 HV4355  USSD        -  38 53 26.68700(N)    077 03 14.34900(W) AD(       ) 3
 HV4355
 HV4355.Superseded values are not recommended for survey control.
 HV4355
 HV4355.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4355.See file dsdata.pdf to determine how the superseded data were derived.
 HV4355
 HV4355_MARKER: B = BOLT
 HV4355_SETTING: 0 = UNSPECIFIED SETTING
 HV4355_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4355
 HV4355  HISTORY     - Date     Condition        Report By
 HV4355  HISTORY     - 1913     MONUMENTED       CGS
 HV4355  HISTORY     - 1939     MARK NOT FOUND   CGS
 HV4355
 HV4355                          STATION DESCRIPTION
 HV4355
 HV4355'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4355'STATION IS 1/2-INCH BOLT SET IN COPING ON W WING WALL OF
 HV4355'OUTFALL SEWER NEAR EASBYS POINT, 7.1 FEET ABOVE MEAN LOW
 HV4355'WATER, AND .05 FOOT ABOVE TOP OF STONE COPING.
 HV4355
 HV4355                          STATION RECOVERY (1939)
 HV4355
 HV4355'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4355'STATION IS DESTROYED BY NEW CONSTRUCTION WORK ON THE SEA
 HV4355'WALL AND PARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9360 ***********************************************************************
 HV9360  DESIGNATION -  OLD NE CORNER
 HV9360  PID         -  HV9360
 HV9360  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9360  COUNTRY     -  US
 HV9360  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9360
 HV9360                         *CURRENT SURVEY CONTROL
 HV9360  ______________________________________________________________________
 HV9360* NAD 83(1993) POSITION- 38 53 25.05851(N) 077 00 31.84183(W)   NO CHECK
 HV9360* NAVD 88 ORTHO HEIGHT -    23.    (meters)       75.    (feet) SCALED
 HV9360  ______________________________________________________________________
 HV9360  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 HV9360  LAPLACE CORR    -         -3.30  (seconds)                    DEFLEC18
 HV9360  HORZ ORDER      -  THIRD
 HV9360
 HV9360.The horizontal coordinates were established by classical geodetic methods
 HV9360.and adjusted by the National Geodetic Survey in November 1994.
 HV9360
 HV9360.No horizontal observational check was made to the station.
 HV9360
 HV9360.The orthometric height was scaled from a topographic map.
 HV9360
 HV9360.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9360.GEOID18 height accuracy estimate available here.
 HV9360
 HV9360.Click photographs - Photos may exist for this station.
 HV9360
 HV9360.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9360
 HV9360. The following values were computed from the NAD 83(1993) position.
 HV9360
 HV9360;                    North         East     Units Scale Factor Converg.
 HV9360;SPC MD       -   135,827.899   399,232.650   MT  0.99994988   -0 00 20.0
 HV9360;SPC MD       -   445,628.70  1,309,815.79   sFT  0.99994988   -0 00 20.0
 HV9360;SPC VA N     - 2,136,873.342 3,629,361.732   MT  0.99995969   +0 55 50.4
 HV9360;SPC VA N     - 7,010,725.29 11,907,330.95   sFT  0.99995969   +0 55 50.4
 HV9360;UTM  18      - 4,306,520.502   325,774.657   MT  0.99997379   -1 15 41.5
 HV9360
 HV9360!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9360!SPC MD       -   1.00000146  x   0.99994988  =   0.99995134
 HV9360!SPC VA N     -   1.00000146  x   0.99995969  =   0.99996115
 HV9360!UTM  18      -   1.00000146  x   0.99997379  =   0.99997525
 HV9360
 HV9360_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2577406520(NAD 83)
 HV9360
 HV9360                          SUPERSEDED SURVEY CONTROL
 HV9360
 HV9360  NAD 83(1991)-  38 53 25.05920(N)    077 00 31.84176(W) AD(       ) 3
 HV9360
 HV9360.Superseded values are not recommended for survey control.
 HV9360
 HV9360.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9360.See file dsdata.pdf to determine how the superseded data were derived.
 HV9360
 HV9360_MARKER: Z = SEE DESCRIPTION
 HV9360_SETTING: 0 = UNSPECIFIED SETTING
 HV9360_MARK LOGO: NGS
 HV9360_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9360_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9360_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV9360+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9360
 HV9360  HISTORY     - Date     Condition        Report By
 HV9360  HISTORY     - 1992     MONUMENTED       NGS
 HV9360
 HV9360                          STATION DESCRIPTION
 HV9360
 HV9360'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9360'STATION IS THE OLD (ORIGINAL) NORTHEAST CORNER OF THE SENATE WING OF
 HV9360'THE CAPITOL LOCATED OFF THE NORTH-SOUTH BASEMENT HALLWAY ON THE EAST
 HV9360'SIDE OF THE BUILDING JUST SOUTH OF A RIGHT (EAST) TURN IN THE HALLWAY
 HV9360'BEHIND DOUBLE STEEL DOORS.  STATION IS MARKED BY THE EXPOSED CORNER
 HV9360'OF THE FOUNDATION 0.37 METER (1.21 FT) INSIDE THE DOORWAY, 1.61
 HV9360'METERS (5.28 FT) SOUTH OF THE NORTH EDGE OF THE DOOR.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4264 ***********************************************************************
 HV4264  DESIGNATION -  OLD POST OFFICE FINIAL
 HV4264  PID         -  HV4264
 HV4264  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4264  COUNTRY     -  US
 HV4264  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4264
 HV4264                         *CURRENT SURVEY CONTROL
 HV4264  ______________________________________________________________________
 HV4264* NAD 83(1993) POSITION- 38 53 39.91756(N) 077 01 39.29160(W)   ADJUSTED
 HV4264  ______________________________________________________________________
 HV4264  GEOID HEIGHT    -        -32.088 (meters)                     GEOID18
 HV4264  LAPLACE CORR    -         -2.69  (seconds)                    DEFLEC18
 HV4264  HORZ ORDER      -  THIRD
 HV4264
 HV4264.The horizontal coordinates were established by classical geodetic methods
 HV4264.and adjusted by the National Geodetic Survey in November 1994.
 HV4264
 HV4264.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4264.GEOID18 height accuracy estimate available here.
 HV4264
 HV4264.Click photographs - Photos may exist for this station.
 HV4264
 HV4264.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4264
 HV4264. The following values were computed from the NAD 83(1993) position.
 HV4264
 HV4264;                    North         East     Units Scale Factor Converg.
 HV4264;SPC MD       -   136,286.410   397,607.330   MT  0.99994990   -0 01 02.3
 HV4264;SPC MD       -   447,133.00  1,304,483.38   sFT  0.99994990   -0 01 02.3
 HV4264;SPC VA N     - 2,137,305.238 3,627,729.121   MT  0.99996003   +0 55 08.3
 HV4264;SPC VA N     - 7,012,142.27 11,901,974.62   sFT  0.99996003   +0 55 08.3
 HV4264;UTM  18      - 4,307,014.544   324,159.735   MT  0.99998075   -1 16 24.3
 HV4264
 HV4264_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2415907014(NAD 83)
 HV4264
 HV4264                          SUPERSEDED SURVEY CONTROL
 HV4264
 HV4264  NAD 83(1991)-  38 53 39.91674(N)    077 01 39.29276(W) AD(       ) 3
 HV4264  NAD 83(1986)-  38 53 39.91622(N)    077 01 39.30339(W) AD(       ) 3
 HV4264  NAD 27      -  38 53 39.51600(N)    077 01 40.37900(W) AD(       ) 3
 HV4264  USSD        -  38 53 39.85100(N)    077 01 40.21300(W) AD(       ) 3
 HV4264
 HV4264.Superseded values are not recommended for survey control.
 HV4264
 HV4264.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4264.See file dsdata.pdf to determine how the superseded data were derived.
 HV4264
 HV4264_MARKER: 86 = CUPOLA
 HV4264_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4264+SATELLITE: SATELLITE OBSERVATIONS - March 19, 2009
 HV4264
 HV4264  HISTORY     - Date     Condition        Report By
 HV4264  HISTORY     - 1913     FIRST OBSERVED   CGS
 HV4264  HISTORY     - 1934     GOOD             CGS
 HV4264  HISTORY     - 1959     GOOD             CGS
 HV4264  HISTORY     - 1979     GOOD             NGS
 HV4264  HISTORY     - 20030529 GOOD             GEOCAC
 HV4264  HISTORY     - 20050718 GOOD             USPSQD
 HV4264  HISTORY     - 20060506 GOOD             GEOCAC
 HV4264  HISTORY     - 20090319 GOOD             GEOCAC
 HV4264  HISTORY     - 20100521 GOOD             GEOCAC
 HV4264
 HV4264                          STATION DESCRIPTION
 HV4264
 HV4264'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4264'STATION IS THE TIP OF THE LARGE CUPOLA ON THE POST OFFICE
 HV4264'BUILDING ON PENNSYLVANIA AVENUE BETWEEN 11TH AND 12TH STREETS, NW.
 HV4264
 HV4264                          STATION RECOVERY (1934)
 HV4264
 HV4264'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1934 (JB)
 HV4264'STATION REDETERMINED.
 HV4264
 HV4264                          STATION RECOVERY (1959)
 HV4264
 HV4264'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (JKR)
 HV4264'STATION RECOVERED IN GOOD CONDITION AS DESCRIBED.
 HV4264
 HV4264                          STATION RECOVERY (1979)
 HV4264
 HV4264'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 (BMP)
 HV4264'THE STATION IS THE ROUND TIP OF THE LARGE CUPOLA ON THE
 HV4264'OLD POST OFFICE BUILDING ON PENNSYLAVANIA AVENUE BETWEEN 11TH
 HV4264'AND 12TH STREETS IN WASHINGTON D.C. THE CUPOLA ABOUT 200 FEET
 HV4264'HIGH AND VERY CONSPICUOUS WAS REMOVED AND REPLACED THIS YEAR WITH
 HV4264'A NEW CUPOLA. THE NEW CUPOLA IS AN EXACT COPY OF THE OLD ONE AND
 HV4264'POSITIONED WITHIN AN INCH OR TWO OF THE OLD ONE ACCORDING
 HV4264'TO THE CONTRACTOR.
 HV4264
 HV4264                          STATION RECOVERY (2003)
 HV4264
 HV4264'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV4264'RECOVERED IN GOOD CONDITION.
 HV4264
 HV4264                          STATION RECOVERY (2005)
 HV4264
 HV4264'RECOVERY NOTE BY US POWER SQUADRON 2005 (FM)
 HV4264'RECOVERED IN GOOD CONDITION.
 HV4264
 HV4264                          STATION RECOVERY (2006)
 HV4264
 HV4264'RECOVERY NOTE BY GEOCACHING 2006 (JER)
 HV4264'RECOVERED IN GOOD CONDITION.
 HV4264
 HV4264                          STATION RECOVERY (2009)
 HV4264
 HV4264'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV4264'RECOVERED IN GOOD CONDITION.
 HV4264
 HV4264                          STATION RECOVERY (2010)
 HV4264
 HV4264'RECOVERY NOTE BY GEOCACHING 2010 (MTT)
 HV4264'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI7414 ***********************************************************************
 AI7414  DESIGNATION -  OSTENSO
 AI7414  PID         -  AI7414
 AI7414  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI7414  COUNTRY     -  US
 AI7414  USGS QUAD   -  WASHINGTON WEST (2016)
 AI7414
 AI7414                         *CURRENT SURVEY CONTROL
 AI7414  ______________________________________________________________________
 AI7414* NAD 83(2011) POSITION- 38 57 36.44397(N) 077 03 12.39625(W)   ADJUSTED
 AI7414* NAD 83(2011) ELLIP HT-    62.830 (meters)        (06/27/12)   ADJUSTED
 AI7414* NAD 83(2011) EPOCH   -  2010.00
 AI7414* NAVD 88 ORTHO HEIGHT -    94.8   (meters)      311.    (feet) GPS OBS
 AI7414  ______________________________________________________________________
 AI7414  NAVD 88 orthometric height was determined with an earlier geoid model
 AI7414  GEOID HEIGHT    -        -31.962 (meters)                     GEOID18
 AI7414  NAD 83(2011) X  -  1,112,629.126 (meters)                     COMP
 AI7414  NAD 83(2011) Y  - -4,839,918.485 (meters)                     COMP
 AI7414  NAD 83(2011) Z  -  3,988,915.202 (meters)                     COMP
 AI7414  LAPLACE CORR    -         -2.82  (seconds)                    DEFLEC18
 AI7414
 AI7414  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AI7414  Standards:
 AI7414         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AI7414            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AI7414  -------------------------------------------------------------------
 AI7414  NETWORK    0.52   1.84           0.24   0.17   0.94     -0.01608900
 AI7414  -------------------------------------------------------------------
 AI7414  Click here for local accuracies and other accuracy information.
 AI7414
 AI7414.The horizontal coordinates were established by GPS observations
 AI7414.and adjusted by the National Geodetic Survey in June 2012.
 AI7414
 AI7414.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AI7414.been affixed to the stable North American tectonic plate. See 
 AI7414.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AI7414
 AI7414.The horizontal coordinates are valid at the epoch date displayed above
 AI7414.which is a decimal equivalence of Year/Month/Day.
 AI7414
 AI7414.The orthometric height was determined by GPS observations and a
 AI7414.high-resolution geoid model.
 AI7414
 AI7414.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI7414.GEOID18 height accuracy estimate available here.
 AI7414
 AI7414.Click photographs - Photos may exist for this station.
 AI7414
 AI7414.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AI7414
 AI7414.The Laplace correction was computed from DEFLEC18 derived deflections.
 AI7414
 AI7414.The ellipsoidal height was determined by GPS observations
 AI7414.and is referenced to NAD 83.
 AI7414
 AI7414. The following values were computed from the NAD 83(2011) position.
 AI7414
 AI7414;                    North         East     Units Scale Factor Converg.
 AI7414;UTM  18      - 4,314,356.626   322,080.913   MT  0.99998980   -1 17 29.4
 AI7414
 AI7414!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AI7414!UTM  18      -   0.99999014  x   0.99998980  =   0.99997994
 AI7414
 AI7414_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2208014356(NAD 83)
 AI7414
 AI7414                          SUPERSEDED SURVEY CONTROL
 AI7414
 AI7414  NAD 83(2007)-  38 57 36.44414(N)    077 03 12.39693(W) AD(2002.00) 0
 AI7414  ELLIP H (02/10/07)   62.856  (m)                       GP(2002.00)    
 AI7414  ELLIP H (08/09/02)   62.859  (m)                       GP(       ) 3 2
 AI7414  NAD 83(1991)-  38 57 36.44428(N)    077 03 12.39706(W) AD(       ) B
 AI7414  ELLIP H (08/03/00)   62.846  (m)                       GP(       ) 2 1
 AI7414  NAVD 88 (08/03/00)   94.8    (m)  GEOID99  model used  GPS OBS        
 AI7414
 AI7414.Superseded values are not recommended for survey control.
 AI7414
 AI7414.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AI7414.See file dsdata.pdf to determine how the superseded data were derived.
 AI7414
 AI7414_MARKER: DH = HORIZONTAL CONTROL DISK
 AI7414_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 AI7414_STAMPING: OSTENSO 1996
 AI7414_MARK LOGO: NGS
 AI7414_PROJECTION: RECESSED 5 CENTIMETERS
 AI7414_MAGNETIC: N = NO MAGNETIC MATERIAL
 AI7414_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AI7414+STABILITY: SURFACE MOTION
 AI7414_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AI7414+SATELLITE: SATELLITE OBSERVATIONS - June 11, 2019
 AI7414
 AI7414  HISTORY     - Date     Condition        Report By
 AI7414  HISTORY     - 1996     MONUMENTED       NGS
 AI7414  HISTORY     - 20000330 GOOD             NGS
 AI7414  HISTORY     - 20190611 GOOD             NGS
 AI7414
 AI7414                          STATION DESCRIPTION
 AI7414
 AI7414'DESCRIBED BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 AI7414'3.95 MI (6.36 KM) WEST ALONG MILITARY BOULVARD FROM THE INTERSECTION
 AI7414'OF 16TH STREET NW IN WASHINGTON DC TO THE INTERSECTION OF OREGON AVE.,
 AI7414'THENCE 0.1 MI (0.16 KM) SOUTH ALONG OREGON AVE. ENTERING ROCK CREEK
 AI7414'PARK TO A PARKING LOT ON RIGHT AND MARK ON THE NORTHWEST CORNER OF A
 AI7414'KNOLL, 32.2 METERS (105.8 FT) WEST OF THE CENTERLINE OF OREGON AVE.,
 AI7414'24.2 METERS (79.3 FT) NORTHWEST OF A MAPLE TREE, AND 18.6 METERS (61.0
 AI7414'FT) NORTH OF NORTH CURB OF PARKING AREA, A CONCRETE POST RECESSED 1 CM
 AI7414'(0.04 FT).
 AI7414
 AI7414                          STATION RECOVERY (2019)
 AI7414
 AI7414'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2019 (RWA)
 AI7414'THE MAPLE TREE IN THE ORIGINAL DESCRIPTION NO LONGER EXISTS.  ORIGINAL
 AI7414'MEASUREMENTS ARE GOOD.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2009 ***********************************************************************
 HV2009  DESIGNATION -  OUTLET GATES USE
 HV2009  PID         -  HV2009
 HV2009  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2009  COUNTRY     -  US
 HV2009  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2009
 HV2009                         *CURRENT SURVEY CONTROL
 HV2009  ______________________________________________________________________
 HV2009* NAD 83(1986) POSITION- 38 52 58.     (N) 077 01 59.     (W)   SCALED
 HV2009* NAVD 88 ORTHO HEIGHT -     3.433 (meters)       11.26  (feet) ADJUSTED
 HV2009  ______________________________________________________________________
 HV2009  GEOID HEIGHT    -        -32.105 (meters)                     GEOID18
 HV2009  DYNAMIC HEIGHT  -          3.431 (meters)       11.26  (feet) COMP
 HV2009  MODELED GRAVITY -    980,097.6   (mgal)                       NAVD 88
 HV2009
 HV2009  VERT ORDER      -  FIRST     CLASS II
 HV2009
 HV2009.The horizontal coordinates were scaled from a map and have
 HV2009.an estimated accuracy of +/- 6 seconds.
 HV2009
 HV2009.The orthometric height was determined by differential leveling and
 HV2009.adjusted by the NATIONAL GEODETIC SURVEY
 HV2009.in June 1991.
 HV2009
 HV2009.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2009.GEOID18 height accuracy estimate available here.
 HV2009
 HV2009.Click photographs - Photos may exist for this station.
 HV2009
 HV2009.The dynamic height is computed by dividing the NAVD 88
 HV2009.geopotential number by the normal gravity value computed on the
 HV2009.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2009.degrees latitude (g = 980.6199 gals.).
 HV2009
 HV2009.The modeled gravity was interpolated from observed gravity values.
 HV2009
 HV2009
 HV2009_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ236057(NAD 83)
 HV2009
 HV2009                          SUPERSEDED SURVEY CONTROL
 HV2009
 HV2009  NGVD 29 (11/26/84)    3.667  (m)           12.03   (f) ADJUSTED    1 2
 HV2009
 HV2009.Superseded values are not recommended for survey control.
 HV2009
 HV2009.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2009.See file dsdata.pdf to determine how the superseded data were derived.
 HV2009
 HV2009_MARKER: B = BOLT
 HV2009_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV2009_SP_SET: BRIDGE
 HV2009_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV2009
 HV2009  HISTORY     - Date     Condition        Report By
 HV2009  HISTORY     - UNK      MONUMENTED       CGS
 HV2009  HISTORY     - 1956     GOOD             CGS
 HV2009
 HV2009                          STATION DESCRIPTION
 HV2009
 HV2009'DESCRIBED BY COAST AND GEODETIC SURVEY 1956
 HV2009'AT WASHINGTON.
 HV2009'AT WASHINGTON, D.C., AT THE TIDAL BASIN OUTLET GATE, ON THE
 HV2009'LOWEST LEVEL BRIDGE CARRYING A SIDEWALK OVER THE OUTLET, ON THE
 HV2009'NW SIDE OF THE BRIDGE, AND IN THE CENTER OF THE 11TH GRANITE
 HV2009'SQUARE FROM THE S END OF THE BRIDGE.  (BY STADIA, MARK IS
 HV2009'APPROXIMATELY 130 FT S OF RV OUTLET.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4210 ***********************************************************************
 HV4210  DESIGNATION -  P 1913
 HV4210  PID         -  HV4210
 HV4210  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4210  COUNTRY     -  US
 HV4210  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4210
 HV4210                         *CURRENT SURVEY CONTROL
 HV4210  ______________________________________________________________________
 HV4210* NAD 83(1993) POSITION- 38 54 36.60807(N) 077 02 59.32671(W)   ADJUSTED
 HV4210* NAVD 88 ORTHO HEIGHT -    15.    (meters)       49.    (feet) SCALED
 HV4210  ______________________________________________________________________
 HV4210  GEOID HEIGHT    -        -32.032 (meters)                     GEOID18
 HV4210  LAPLACE CORR    -         -2.21  (seconds)                    DEFLEC18
 HV4210  HORZ ORDER      -  THIRD
 HV4210
 HV4210.The horizontal coordinates were established by classical geodetic methods
 HV4210.and adjusted by the National Geodetic Survey in November 1994.
 HV4210
 HV4210.The orthometric height was scaled from a topographic map.
 HV4210
 HV4210.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4210.GEOID18 height accuracy estimate available here.
 HV4210
 HV4210.Click photographs - Photos may exist for this station.
 HV4210
 HV4210.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4210
 HV4210. The following values were computed from the NAD 83(1993) position.
 HV4210
 HV4210;                    North         East     Units Scale Factor Converg.
 HV4210;SPC MD       -   138,035.311   395,679.646   MT  0.99995003   -0 01 52.6
 HV4210;SPC MD       -   452,870.85  1,298,158.97   sFT  0.99995003   -0 01 52.6
 HV4210;SPC VA N     - 2,139,022.425 3,625,773.094   MT  0.99996140   +0 54 18.3
 HV4210;SPC VA N     - 7,017,776.07 11,895,557.23   sFT  0.99996140   +0 54 18.3
 HV4210;UTM  18      - 4,308,805.353   322,270.793   MT  0.99998897   -1 17 16.2
 HV4210
 HV4210!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4210!SPC MD       -   1.00000271  x   0.99995003  =   0.99995274
 HV4210!SPC VA N     -   1.00000271  x   0.99996140  =   0.99996411
 HV4210!UTM  18      -   1.00000271  x   0.99998897  =   0.99999168
 HV4210
 HV4210:                Primary Azimuth Mark                     Grid Az
 HV4210:SPC MD       -  NAVAL 1912                               310 34 45.3
 HV4210:SPC VA N     -  NAVAL 1912                               309 38 34.4
 HV4210:UTM  18      -  NAVAL 1912                               311 50 08.9
 HV4210
 HV4210_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2227008805(NAD 83)
 HV4210
 HV4210|---------------------------------------------------------------------|
 HV4210| PID    Reference Object                     Distance      Geod. Az  |
 HV4210|                                                           dddmmss.s |
 HV4210| HV4208 NAVAL 1912                          APPROX. 1.8 KM 3103252.7 |
 HV4210|---------------------------------------------------------------------|
 HV4210
 HV4210                          SUPERSEDED SURVEY CONTROL
 HV4210
 HV4210  NAD 83(1991)-  38 54 36.60703(N)    077 02 59.32810(W) AD(       ) 3
 HV4210  NAD 83(1986)-  38 54 36.60659(N)    077 02 59.33842(W) AD(       ) 3
 HV4210  NAD 27      -  38 54 36.20600(N)    077 03 00.41600(W) AD(       ) 3
 HV4210  USSD        -  38 54 36.54300(N)    077 03 00.24700(W) AD(       ) 3
 HV4210
 HV4210.Superseded values are not recommended for survey control.
 HV4210
 HV4210.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4210.See file dsdata.pdf to determine how the superseded data were derived.
 HV4210
 HV4210_MARKER: Z = SEE DESCRIPTION
 HV4210_SETTING: 0 = UNSPECIFIED SETTING
 HV4210_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4210
 HV4210  HISTORY     - Date     Condition        Report By
 HV4210  HISTORY     - 1913     MONUMENTED       CGS
 HV4210  HISTORY     - 1939     MARK NOT FOUND   CGS
 HV4210
 HV4210                          STATION DESCRIPTION
 HV4210
 HV4210'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4210'STATION IS A STUB WITH HOLE IN TOP ABOUT 100 FEET N OF P STREET,
 HV4210'AND JUST ON THE TOP OF THE E BANK OF ROCK CREEK.  WAS USED MERELY
 HV4210'FOR THE SURVEY OF FLORIDA AVENUE AND NOT MARKED PERMANENTLY AS IT
 HV4210'IS NOT LIKELY TO BE PRESERVED.
 HV4210
 HV4210                          STATION RECOVERY (1939)
 HV4210
 HV4210'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4210'STATION LOST.  ORIGINALLY ONLY A TEMPORARY MARK, AND THERE HAS
 HV4210'BEEN MUCH CONSTRUCTION SINCE THEN WHICH WOULD HAVE DESTROYED IT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2044 ***********************************************************************
 HV2044  DESIGNATION -  P 2
 HV2044  PID         -  HV2044
 HV2044  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2044  COUNTRY     -  US
 HV2044  USGS QUAD   -  ALEXANDRIA (2019)
 HV2044
 HV2044                         *CURRENT SURVEY CONTROL
 HV2044  ______________________________________________________________________
 HV2044* NAD 83(1986) POSITION- 38 50 36.     (N) 077 00 38.     (W)   SCALED
 HV2044* NAVD 88 ORTHO HEIGHT -    10.370 (meters)       34.02  (feet) ADJUSTED
 HV2044  ______________________________________________________________________
 HV2044  GEOID HEIGHT    -        -32.204 (meters)                     GEOID18
 HV2044  DYNAMIC HEIGHT  -         10.364 (meters)       34.00  (feet) COMP
 HV2044  MODELED GRAVITY -    980,091.3   (mgal)                       NAVD 88
 HV2044
 HV2044  VERT ORDER      -  FIRST     CLASS II
 HV2044
 HV2044.The horizontal coordinates were scaled from a map and have
 HV2044.an estimated accuracy of +/- 6 seconds.
 HV2044
 HV2044.The orthometric height was determined by differential leveling and
 HV2044.adjusted by the NATIONAL GEODETIC SURVEY
 HV2044.in June 1991.
 HV2044
 HV2044.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2044.GEOID18 height accuracy estimate available here.
 HV2044
 HV2044.Click photographs - Photos may exist for this station.
 HV2044
 HV2044.The dynamic height is computed by dividing the NAVD 88
 HV2044.geopotential number by the normal gravity value computed on the
 HV2044.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2044.degrees latitude (g = 980.6199 gals.).
 HV2044
 HV2044.The modeled gravity was interpolated from observed gravity values.
 HV2044
 HV2044
 HV2044_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ255013(NAD 83)
 HV2044
 HV2044                          SUPERSEDED SURVEY CONTROL
 HV2044
 HV2044  NGVD 29 (11/26/84)   10.614  (m)           34.82   (f) ADJUSTED    1 2
 HV2044
 HV2044.Superseded values are not recommended for survey control.
 HV2044
 HV2044.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2044.See file dsdata.pdf to determine how the superseded data were derived.
 HV2044
 HV2044_MARKER: DB = BENCH MARK DISK
 HV2044_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2044_SP_SET: PLATFORM
 HV2044_STAMPING: P 2 1944
 HV2044_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2044
 HV2044  HISTORY     - Date     Condition        Report By
 HV2044  HISTORY     - 1944     MONUMENTED       CGS
 HV2044  HISTORY     - 1960     GOOD             CGS
 HV2044
 HV2044                          STATION DESCRIPTION
 HV2044
 HV2044'DESCRIBED BY COAST AND GEODETIC SURVEY 1944
 HV2044'IN WASHINGTON.
 HV2044'IN SOUTHEAST WASHINGTON, AT BOLLING AIR FORCE BASE, 110 FEET
 HV2044'EAST OF THE CENTERLINE OF DUNCAN AVENUE, AT THE MAIN ENTRANCE
 HV2044'TO THE MATERIAL BUILDING (BUILDING T-412), 14 FEET NORTH OF THE
 HV2044'MAIN DOOR, IN THE TOP OF THE CONCRETE PLATFORM, 6 INCHES WEST
 HV2044'OF THE WEST SIDE OF A PILASTER, AND ABOUT 2 FEET ABOVE THE LEVEL
 HV2044'OF THE DRIVEWAY.  A STANDARD DISK, STAMPED P 2 1944.
 HV2044
 HV2044                          STATION RECOVERY (1960)
 HV2044
 HV2044'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV2044'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1784 ***********************************************************************
 HV1784  DESIGNATION -  P 242 WSSC
 HV1784  PID         -  HV1784
 HV1784  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1784  COUNTRY     -  US
 HV1784  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1784
 HV1784                         *CURRENT SURVEY CONTROL
 HV1784  ______________________________________________________________________
 HV1784* NAD 83(1986) POSITION- 38 58 38.     (N) 077 01 08.     (W)   SCALED
 HV1784* NAVD 88 ORTHO HEIGHT -    91.032 (meters)      298.66  (feet) ADJUSTED
 HV1784  ______________________________________________________________________
 HV1784  GEOID HEIGHT    -        -31.994 (meters)                     GEOID18
 HV1784  DYNAMIC HEIGHT  -         90.983 (meters)      298.50  (feet) COMP
 HV1784  MODELED GRAVITY -    980,091.2   (mgal)                       NAVD 88
 HV1784
 HV1784  VERT ORDER      -  FIRST     CLASS II
 HV1784
 HV1784.The horizontal coordinates were scaled from a map and have
 HV1784.an estimated accuracy of +/- 6 seconds.
 HV1784
 HV1784.The orthometric height was determined by differential leveling and
 HV1784.adjusted by the NATIONAL GEODETIC SURVEY
 HV1784.in June 1991.
 HV1784
 HV1784.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1784.GEOID18 height accuracy estimate available here.
 HV1784
 HV1784.Click photographs - Photos may exist for this station.
 HV1784
 HV1784.The dynamic height is computed by dividing the NAVD 88
 HV1784.geopotential number by the normal gravity value computed on the
 HV1784.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1784.degrees latitude (g = 980.6199 gals.).
 HV1784
 HV1784.The modeled gravity was interpolated from observed gravity values.
 HV1784
 HV1784
 HV1784_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ251161(NAD 83)
 HV1784
 HV1784                          SUPERSEDED SURVEY CONTROL
 HV1784
 HV1784  NGVD 29 (11/26/84)   91.244  (m)          299.36   (f) ADJUSTED    1 2
 HV1784
 HV1784.Superseded values are not recommended for survey control.
 HV1784
 HV1784.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1784.See file dsdata.pdf to determine how the superseded data were derived.
 HV1784
 HV1784_MARKER: B = BOLT
 HV1784_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1784_SP_SET: SIGNAL FOUNDATION
 HV1784_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1784
 HV1784  HISTORY     - Date     Condition        Report By
 HV1784  HISTORY     - UNK      MONUMENTED       WSSC
 HV1784  HISTORY     - 1933     GOOD             CGS
 HV1784  HISTORY     - 1951     MARK NOT FOUND   CGS
 HV1784
 HV1784                          STATION DESCRIPTION
 HV1784
 HV1784'DESCRIBED BY COAST AND GEODETIC SURVEY 1933
 HV1784'AT TAKOMA PARK.
 HV1784'AT TAKOMA PARK, D.C., ON THE METROPOLITAN BRANCH OF THE BALTIMORE
 HV1784'AND OHIO RAILROAD, ABOUT 1/4 MILE NORTH OF THE STATION, AT THE
 HV1784'ABANDONED CHESTNUT AVENUE CROSSING, ON THE WEST SIDE OF THE
 HV1784'SOUTHBOUND TRACK, AT SIGNAL POST E 6-24, AND IN THE TOP OF THE
 HV1784'FOUNDATION.  A CROSS ON THE TOP OF A STEEL BOLT.
 HV1784
 HV1784                          STATION RECOVERY (1951)
 HV1784
 HV1784'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1951
 HV1784'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1829 ***********************************************************************
 HV1829  DESIGNATION -  P 4 WMATA
 HV1829  PID         -  HV1829
 HV1829  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1829  COUNTRY     -  US
 HV1829  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1829
 HV1829                         *CURRENT SURVEY CONTROL
 HV1829  ______________________________________________________________________
 HV1829* NAD 83(1986) POSITION- 38 53 50.0    (N) 077 01 21.6    (W)   HD_HELD2
 HV1829* NAVD 88 ORTHO HEIGHT -    11.998 (meters)       39.36  (feet) ADJUSTED
 HV1829  ______________________________________________________________________
 HV1829  GEOID HEIGHT    -        -32.090 (meters)                     GEOID18
 HV1829  DYNAMIC HEIGHT  -         11.992 (meters)       39.34  (feet) COMP
 HV1829  MODELED GRAVITY -    980,100.5   (mgal)                       NAVD 88
 HV1829
 HV1829  VERT ORDER      -  FIRST     CLASS I
 HV1829
 HV1829.The horizontal coordinates were established by autonomous hand held GPS
 HV1829.observations and have an estimated accuracy of +/- 10 meters.
 HV1829
 HV1829.The orthometric height was determined by differential leveling and
 HV1829.adjusted by the NATIONAL GEODETIC SURVEY
 HV1829.in June 1991.
 HV1829
 HV1829.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1829.GEOID18 height accuracy estimate available here.
 HV1829
 HV1829.Click photographs - Photos may exist for this station.
 HV1829
 HV1829.The dynamic height is computed by dividing the NAVD 88
 HV1829.geopotential number by the normal gravity value computed on the
 HV1829.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1829.degrees latitude (g = 980.6199 gals.).
 HV1829
 HV1829.The modeled gravity was interpolated from observed gravity values.
 HV1829
 HV1829
 HV1829_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2459207315(NAD 83)
 HV1829
 HV1829                          SUPERSEDED SURVEY CONTROL
 HV1829
 HV1829  NGVD 29 (11/26/84)   12.231  (m)           40.13   (f) ADJUSTED    1 1
 HV1829
 HV1829.Superseded values are not recommended for survey control.
 HV1829
 HV1829.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1829.See file dsdata.pdf to determine how the superseded data were derived.
 HV1829
 HV1829_MARKER: Z = SEE DESCRIPTION
 HV1829_SETTING: 66 = SET IN ROCK OUTCROP
 HV1829_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 HV1829+STABILITY: POSITION/ELEVATION WELL
 HV1829
 HV1829  HISTORY     - Date     Condition        Report By
 HV1829  HISTORY     - UNK      MONUMENTED       WMATA
 HV1829  HISTORY     - 1974     GOOD             NGS
 HV1829  HISTORY     - 20100314 GOOD             GEOCAC
 HV1829
 HV1829                          STATION DESCRIPTION
 HV1829
 HV1829'DESCRIBED BY NATIONAL GEODETIC SURVEY 1974
 HV1829'IN WASHINGTON.
 HV1829'IN THE NORTH SIDE-WALK OF F STREET NW BETWEEN 7TH AND 9TH
 HV1829'STREETS.  THREE METERS NORTH FROM THE CURB AND 12 METERS EAST
 HV1829'FROM THE EAST CORNER OF THE STEPS LEADING TO THE F STREET
 HV1829'ENTRANCE OF THE NATIONAL PORTRAIT GALLERY.  THE MARK CONSISTS
 HV1829'OF A 3 1/2 IN. DIAMETER OUTER PIPE SET ON THE BEDROCK AND A
 HV1829'2 IN. DIAMETER INNER PIPE TEN FEET IN THE BEDROCK.  A 2 IN.
 HV1829'DIAMETER STAINLESS STEEL BALL IS WELDED TO THE TOP OF THE
 HV1829'INNER PIPE.  A 12 IN. X 12 IN. X 12 IN. ACCESS BOX WITH A CAST
 HV1829'IRON COVER PROTECTS THE TOP OF THE BM.  A LARGE SCREW DRIVER IS
 HV1829'NEEDED TO OPEN THE BOX.
 HV1829
 HV1829                          STATION RECOVERY (2010)
 HV1829
 HV1829'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 HV1829'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2054 ***********************************************************************
 HV2054  DESIGNATION -  P 414=DC BOUNDARY STONE 8
 HV2054  PID         -  HV2054
 HV2054  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2054  COUNTRY     -  US
 HV2054  USGS QUAD   -  ALEXANDRIA (2019)
 HV2054
 HV2054                         *CURRENT SURVEY CONTROL
 HV2054  ______________________________________________________________________
 HV2054* NAD 83(1986) POSITION- 38 48 38.     (N) 077 00 52.     (W)   SCALED
 HV2054* NAVD 88 ORTHO HEIGHT -     0.87  (+/-2cm)        2.9   (feet) VERTCON3
 HV2054  ______________________________________________________________________
 HV2054  GEOID HEIGHT    -        -32.257 (meters)                     GEOID18
 HV2054  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV2054
 HV2054.The horizontal coordinates were scaled from a map and have
 HV2054.an estimated accuracy of +/- 6 seconds.
 HV2054
 HV2054.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV2054.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV2054
 HV2054.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2054.GEOID18 height accuracy estimate available here.
 HV2054
 HV2054.The vertical order pertains to the NGVD 29 superseded value.
 HV2054
 HV2054.Click photographs - Photos may exist for this station.
 HV2054
 HV2054
 HV2054_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH250976(NAD 83)
 HV2054
 HV2054                          SUPERSEDED SURVEY CONTROL
 HV2054
 HV2054  NGVD 29 (11/26/84)    1.122  (m)            3.68   (f) ADJUSTED    1 2
 HV2054
 HV2054.Superseded values are not recommended for survey control.
 HV2054
 HV2054.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2054.See file dsdata.pdf to determine how the superseded data were derived.
 HV2054
 HV2054_MARKER: Z = SEE DESCRIPTION
 HV2054_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2054_SP_SET: BOUNDARY STONE
 HV2054_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2054
 HV2054  HISTORY     - Date     Condition        Report By
 HV2054  HISTORY     - UNK      MONUMENTED       PBPP
 HV2054  HISTORY     - 1931     GOOD             PBPP
 HV2054
 HV2054                          STATION DESCRIPTION
 HV2054
 HV2054'DESCRIBED BY PUB BLDGS AND PARKS 1931
 HV2054'AT WASHINGTON.
 HV2054'ON THE DISTRICT OF COLUMBIA-MARYLAND LINE, 0.3 MILE SOUTH-SOUTHEAST
 HV2054'OF THE HOME FOR THE AGED AND INFIRM AT BLUE PLAINS, D.C., AND
 HV2054'AT AN OLD STONE DATED 1792 AND ENCLOSED IN A WIRE GRATING BY
 HV2054'THE D.A.R. (THIS STONE IS KNOWN AS DC 8).  THE HIGHEST POINT
 HV2054'ON THE BOUNDARY STONE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1857 ***********************************************************************
 HV1857  DESIGNATION -  P 5
 HV1857  PID         -  HV1857
 HV1857  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1857  COUNTRY     -  US
 HV1857  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1857
 HV1857                         *CURRENT SURVEY CONTROL
 HV1857  ______________________________________________________________________
 HV1857* NAD 83(1986) POSITION- 38 54 09.     (N) 077 03 27.     (W)   SCALED
 HV1857* NAVD 88 ORTHO HEIGHT -     6.780 (meters)       22.24  (feet) ADJUSTED
 HV1857  ______________________________________________________________________
 HV1857  GEOID HEIGHT    -        -32.036 (meters)                     GEOID18
 HV1857  DYNAMIC HEIGHT  -          6.777 (meters)       22.23  (feet) COMP
 HV1857  MODELED GRAVITY -    980,093.8   (mgal)                       NAVD 88
 HV1857
 HV1857  VERT ORDER      -  FIRST     CLASS I
 HV1857
 HV1857.The horizontal coordinates were scaled from a map and have
 HV1857.an estimated accuracy of +/- 6 seconds.
 HV1857
 HV1857.The orthometric height was determined by differential leveling and
 HV1857.adjusted by the NATIONAL GEODETIC SURVEY
 HV1857.in June 1991.
 HV1857
 HV1857.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1857.GEOID18 height accuracy estimate available here.
 HV1857
 HV1857.Click photographs - Photos may exist for this station.
 HV1857
 HV1857.The dynamic height is computed by dividing the NAVD 88
 HV1857.geopotential number by the normal gravity value computed on the
 HV1857.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1857.degrees latitude (g = 980.6199 gals.).
 HV1857
 HV1857.The modeled gravity was interpolated from observed gravity values.
 HV1857
 HV1857
 HV1857_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ215079(NAD 83)
 HV1857
 HV1857                          SUPERSEDED SURVEY CONTROL
 HV1857
 HV1857  NGVD 29 (11/26/84)    7.016  (m)           23.02   (f) ADJUSTED    1 1
 HV1857
 HV1857.Superseded values are not recommended for survey control.
 HV1857
 HV1857.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1857.See file dsdata.pdf to determine how the superseded data were derived.
 HV1857
 HV1857_MARKER: DB = BENCH MARK DISK
 HV1857_SETTING: 38 = SET IN THE ABUTMENT OR PIER OF A LARGE BRIDGE
 HV1857_SP_SET: PIER
 HV1857_STAMPING: P 5 1971
 HV1857_MARK LOGO: NGS
 HV1857_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1857_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1857+SATELLITE: SATELLITE OBSERVATIONS - April 06, 1990
 HV1857
 HV1857  HISTORY     - Date     Condition        Report By
 HV1857  HISTORY     - 1971     MONUMENTED       NGS
 HV1857  HISTORY     - 1974     GOOD             NGS
 HV1857  HISTORY     - 1984     GOOD             NGS
 HV1857  HISTORY     - 19900406 GOOD             NGS
 HV1857
 HV1857                          STATION DESCRIPTION
 HV1857
 HV1857'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1857'AT WASHINGTON.
 HV1857'AT WASHINGTON, D.C., ABOUT 1.3 MILES NORTH ALONG ROCK CREEK
 HV1857'PARKWAY FROM THE LINCOLN MEMORIAL, AT THE FIRST NEW CONCRETE
 HV1857'OVERPASS SOUTH OF THE WHITEHURST FREEWAY, SET VERTICALLY IN THE
 HV1857'SOUTHEAST FACE OF THE MORE SOUTHWESTERLY OF TWO CONCRETE PILLARS
 HV1857'FOR THE OVERPASS, 26 FEET SOUTHEAST OF THE CENTER LINE OF THE
 HV1857'SOUTHEAST LANES OF THE PARKWAY, ABOUT 2 1/2 FEET ABOVE THE LEVEL
 HV1857'OF THE GROUND, AND ABOUT 3 1/2 FEET ABOVE THE PARKWAY.
 HV1857
 HV1857                          STATION RECOVERY (1974)
 HV1857
 HV1857'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974
 HV1857'RECOVERED IN GOOD CONDITION.
 HV1857
 HV1857                          STATION RECOVERY (1984)
 HV1857
 HV1857'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984
 HV1857'RECOVERED IN GOOD CONDITION.
 HV1857
 HV1857                          STATION RECOVERY (1990)
 HV1857
 HV1857'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990
 HV1857'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7657 ***********************************************************************
 HV7657  DESIGNATION -  P USE 1931
 HV7657  PID         -  HV7657
 HV7657  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7657  COUNTRY     -  US
 HV7657  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7657
 HV7657                         *CURRENT SURVEY CONTROL
 HV7657  ______________________________________________________________________
 HV7657* NAD 83(1993) POSITION- 38 54 34.00053(N) 076 56 30.77671(W)   ADJUSTED
 HV7657* NAVD 88 ORTHO HEIGHT -     6.7   (meters)       22.    (feet) VERTCON3
 HV7657  ______________________________________________________________________
 HV7657  GEOID HEIGHT    -        -32.230 (meters)                     GEOID18
 HV7657  LAPLACE CORR    -         -4.39  (seconds)                    DEFLEC18
 HV7657  HORZ ORDER      -  THIRD
 HV7657
 HV7657.The horizontal coordinates were established by classical geodetic methods
 HV7657.and adjusted by the National Geodetic Survey in November 1994.
 HV7657
 HV7657.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV7657.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV7657
 HV7657.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7657.GEOID18 height accuracy estimate available here.
 HV7657
 HV7657.Click photographs - Photos may exist for this station.
 HV7657
 HV7657.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7657
 HV7657. The following values were computed from the NAD 83(1993) position.
 HV7657
 HV7657;                    North         East     Units Scale Factor Converg.
 HV7657;SPC MD       -   137,955.332   405,040.676   MT  0.99995002   +0 02 11.3
 HV7657;SPC MD       -   452,608.45  1,328,870.95   sFT  0.99995002   +0 02 11.3
 HV7657;SPC VA N     - 2,139,095.401 3,635,134.287   MT  0.99996133   +0 58 20.8
 HV7657;SPC VA N     - 7,018,015.49 11,926,269.74   sFT  0.99996133   +0 58 20.8
 HV7657;UTM  18      - 4,308,520.116   331,627.994   MT  0.99994909   -1 13 11.9
 HV7657
 HV7657!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7657!SPC MD       -   1.00000401  x   0.99995002  =   0.99995403
 HV7657!SPC VA N     -   1.00000401  x   0.99996133  =   0.99996534
 HV7657!UTM  18      -   1.00000401  x   0.99994909  =   0.99995310
 HV7657
 HV7657:                Primary Azimuth Mark                     Grid Az
 HV7657:SPC MD       -  RACE USE 1931                            224 36 53.8
 HV7657:SPC VA N     -  RACE USE 1931                            223 40 44.3
 HV7657:UTM  18      -  RACE USE 1931                            225 52 17.0
 HV7657
 HV7657_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3162708520(NAD 83)
 HV7657
 HV7657|---------------------------------------------------------------------|
 HV7657| PID    Reference Object                     Distance      Geod. Az  |
 HV7657|                                                           dddmmss.s |
 HV7657| HV7668 RACE USE 1931                       APPROX. 1.0 KM 2243905.1 |
 HV7657|---------------------------------------------------------------------|
 HV7657
 HV7657                          SUPERSEDED SURVEY CONTROL
 HV7657
 HV7657  NAD 83(1991)-  38 54 33.99930(N)    076 56 30.77774(W) AD(       ) 3
 HV7657  NAD 83(1986)-  38 54 33.99831(N)    076 56 30.78879(W) AD(       ) 3
 HV7657  NAD 27      -  38 54 33.59100(N)    076 56 31.89400(W) AD(       ) 3
 HV7657  NGVD 29 (07/19/86)    6.9    (m)           23.     (f) VERT ANG       
 HV7657
 HV7657.Superseded values are not recommended for survey control.
 HV7657
 HV7657.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7657.See file dsdata.pdf to determine how the superseded data were derived.
 HV7657
 HV7657
 HV7657  HISTORY     - Date     Condition        Report By
 HV7657  HISTORY     - 1931     MONUMENTED       CGS
 HV7657  HISTORY     - 1972     MARK NOT FOUND   NGS
 HV7657
 HV7657                          STATION DESCRIPTION
 HV7657
 HV7657'DESCRIBED BY NATIONAL GEODETIC SURVEY 1972 (RDO)
 HV7657'STATION WAS SEARCHED FOR AND NOT FOUND.  A STREET HAS BEEN
 HV7657'CONSTRUCTED IN THE AREA WITH ROAD GRADE BEING CUT OVER THE STATION
 HV7657'SIGHT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9070 ***********************************************************************
 HV9070  DESIGNATION -  PARADE
 HV9070  PID         -  HV9070
 HV9070  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9070  COUNTRY     -  US
 HV9070  USGS QUAD   -  ALEXANDRIA (2019)
 HV9070
 HV9070                         *CURRENT SURVEY CONTROL
 HV9070  ______________________________________________________________________
 HV9070* NAD 83(2011) POSITION- 38 52 05.92410(N) 077 00 59.53787(W)   ADJUSTED
 HV9070* NAD 83(2011) ELLIP HT-   -28.525 (meters)        (06/27/12)   ADJUSTED
 HV9070* NAD 83(2011) EPOCH   -  2010.00
 HV9070* NAVD 88 ORTHO HEIGHT -     3.634 (meters)       11.92  (feet) ADJUSTED
 HV9070  ______________________________________________________________________
 HV9070  GEOID HEIGHT    -        -32.157 (meters)                     GEOID18
 HV9070  NAD 83(2011) X  -  1,117,168.812 (meters)                     COMP
 HV9070  NAD 83(2011) Y  - -4,845,370.250 (meters)                     COMP
 HV9070  NAD 83(2011) Z  -  3,980,927.297 (meters)                     COMP
 HV9070  LAPLACE CORR    -         -3.10  (seconds)                    DEFLEC18
 HV9070  DYNAMIC HEIGHT  -          3.632 (meters)       11.92  (feet) COMP
 HV9070  MODELED GRAVITY -    980,096.2   (mgal)                       NAVD 88
 HV9070
 HV9070  VERT ORDER      -  FIRST     CLASS II
 HV9070
 HV9070  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV9070  Standards:
 HV9070         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV9070            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV9070  -------------------------------------------------------------------
 HV9070  NETWORK    3.65  16.09           1.44   1.49   8.21      0.34514160
 HV9070  -------------------------------------------------------------------
 HV9070  Click here for local accuracies and other accuracy information.
 HV9070
 HV9070.The horizontal coordinates were established by GPS observations
 HV9070.and adjusted by the National Geodetic Survey in June 2012.
 HV9070
 HV9070.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV9070.been affixed to the stable North American tectonic plate. See 
 HV9070.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV9070
 HV9070.The horizontal coordinates are valid at the epoch date displayed above
 HV9070.which is a decimal equivalence of Year/Month/Day.
 HV9070
 HV9070.The orthometric height was determined by differential leveling and
 HV9070.adjusted by the NATIONAL GEODETIC SURVEY
 HV9070.in February 1993.
 HV9070
 HV9070.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9070.GEOID18 height accuracy estimate available here.
 HV9070
 HV9070.Click photographs - Photos may exist for this station.
 HV9070
 HV9070.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV9070
 HV9070.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9070
 HV9070.The ellipsoidal height was determined by GPS observations
 HV9070.and is referenced to NAD 83.
 HV9070
 HV9070.The dynamic height is computed by dividing the NAVD 88
 HV9070.geopotential number by the normal gravity value computed on the
 HV9070.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV9070.degrees latitude (g = 980.6199 gals.).
 HV9070
 HV9070.The modeled gravity was interpolated from observed gravity values.
 HV9070
 HV9070. The following values were computed from the NAD 83(2011) position.
 HV9070
 HV9070;                    North         East     Units Scale Factor Converg.
 HV9070;SPC MD       -   133,387.847   398,564.767   MT  0.99994986   -0 00 37.4
 HV9070;SPC MD       -   437,623.29  1,307,624.57   sFT  0.99994986   -0 00 37.4
 HV9070;SPC VA N     - 2,134,422.681 3,628,733.801   MT  0.99995794   +0 55 33.1
 HV9070;SPC VA N     - 7,002,685.08 11,905,270.81   sFT  0.99995794   +0 55 33.1
 HV9070;UTM  18      - 4,304,095.610   325,053.445   MT  0.99997689   -1 15 56.8
 HV9070
 HV9070!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9070!SPC MD       -   1.00000448  x   0.99994986  =   0.99995434
 HV9070!SPC VA N     -   1.00000448  x   0.99995794  =   0.99996242
 HV9070!UTM  18      -   1.00000448  x   0.99997689  =   0.99998137
 HV9070
 HV9070_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2505304095(NAD 83)
 HV9070
 HV9070                          SUPERSEDED SURVEY CONTROL
 HV9070
 HV9070  NAD 83(2007)-  38 52 05.92428(N)    077 00 59.53875(W) AD(2002.00) 0
 HV9070  ELLIP H (02/10/07)  -28.501  (m)                       GP(2002.00)    
 HV9070  ELLIP H (08/09/02)  -28.496  (m)                       GP(       ) 4 2
 HV9070  NAD 83(1993)-  38 52 05.92511(N)    077 00 59.53877(W) AD(       ) 1
 HV9070  ELLIP H (06/29/94)  -28.476  (m)                       GP(       ) 4 1
 HV9070  NAD 83(1993)-  38 52 05.92514(N)    077 00 59.53876(W) AD(       ) 1
 HV9070  ELLIP H (04/04/94)  -28.476  (m)                       GP(       ) 4 1
 HV9070  NAD 83(1991)-  38 52 05.92519(N)    077 00 59.53864(W) AD(       ) 1
 HV9070  ELLIP H (12/31/92)  -28.476  (m)                       GP(       ) 4 2
 HV9070  NAVD 88               3.63   (m)           11.9    (f) LEVELING    3  
 HV9070  NAVD 88 (12/31/92)    3.6    (m)  GEOID90  model used  GPS OBS        
 HV9070  NGVD 29 (08/12/92)    3.870  (m)           12.70   (f) ADJUSTED    1 2
 HV9070
 HV9070.Superseded values are not recommended for survey control.
 HV9070
 HV9070.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9070.See file dsdata.pdf to determine how the superseded data were derived.
 HV9070
 HV9070_MARKER: I = METAL ROD
 HV9070_SETTING: 59 = STAINLESS STEEL ROD IN SLEEVE (10 FT.+)
 HV9070_STAMPING: PARADE 1992
 HV9070_MARK LOGO: NGS
 HV9070_PROJECTION: RECESSED 9 CENTIMETERS
 HV9070_MAGNETIC: I = MARKER IS A STEEL ROD
 HV9070_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV9070_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV9070+SATELLITE: SATELLITE OBSERVATIONS - August 25, 2009
 HV9070_ROD/PIPE-DEPTH: 17.7 meters
 HV9070_SLEEVE-DEPTH  : 0.9 meters
 HV9070
 HV9070  HISTORY     - Date     Condition        Report By
 HV9070  HISTORY     - 1992     MONUMENTED       NGS
 HV9070  HISTORY     - 19920513 GOOD             NGS
 HV9070  HISTORY     - 20030612 GOOD             DMW
 HV9070  HISTORY     - 20090825 GOOD             JMTMD
 HV9070
 HV9070                          STATION DESCRIPTION
 HV9070
 HV9070'DESCRIBED BY NATIONAL GEODETIC SURVEY 1992
 HV9070'THE STATION IS LOCATED ABOUT 2.4 KM (1.49 MI) SOUTH FROM THE U.S.
 HV9070'CAPITOL BUILDING IN WASHINGTON, D.C., IN THE MIDDLE OF THE FORT
 HV9070'MCNAIR PARADE GROUND.  OWNERSHIP--U.S. ARMY, DIRECTORATE OF PUBLIC
 HV9070'WORKS, (ANTW-END), ATTENTION CHARLES R. CHALFANT, BUILDING 203, FORT
 HV9070'MYERS, ARLINGTON, VA 22211-5050.  TELEPHONE NUMBER 703-696-6730.
 HV9070'TO REACH THE STATION FROM THE JUNCTION OF INDEPENDENCE AVENUE AND
 HV9070'SOUTHWEST 12TH STREET IN DOWNTOWN WASHINGTON, D.C., GO SOUTH ON
 HV9070'SOUTHWEST 12TH STREET FOR 0.48 KM (0.30 MI) TO A TUNNEL.  CONTINUE
 HV9070'SOUTHERLY ON MAIN AVEUNE FOR 1.3 KM (0.81 MI) TO 4TH STREET.  TURN
 HV9070'RIGHT, SOUTH, ON 4TH STREET FOR 0.5 KM (0.31 MI) TO P STREET AND THE
 HV9070'MAIN GATE TO FORT MCNAIR.  PASS THROUGH GATE, SOUTH, ON B STREET FOR
 HV9070'0.16 KM.  TURN RIGHT, WEST, ON B STREET FOR 0.16 KM (0.10 MI) TO 2ND
 HV9070'AVENUE.  TURN LEFT, SOUTH, ON 2ND AVENUE FOR 0.32 KM (0.20 MI) TO A
 HV9070'PAVED ROAD LEFT.  TURN LEFT, EAST, FOR 0.16 KM (0.10 MI) TO FOURTH
 HV9070'AVENUE.  TURN LEFT, NORTH, ON FOURTH AVENUE FOR 0.32 KM (0.20 MI) TO
 HV9070'THE STATION ON THE LEFT IN THE PARADE FIELD.
 HV9070'THE STATION IS LOCATED 43.0 M (141.08 FT) WEST FROM THE CENTERLINE OF
 HV9070'FOURTH AVENUE AND 108 M (354.33 FT) EAST FROM THE REVIEWING STAND.
 HV9070
 HV9070                          STATION RECOVERY (1992)
 HV9070
 HV9070'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV9070'0.5 KM (0.30 MI) SOUTHERLY AND WESTERLY ALONG B STREET FROM THE MAIN
 HV9070'GATE AT FORT MCNAIR, THENCE 0.3 KM (0.20 MI) SOUTHERLY ALONG 2ND
 HV9070'AVENUE, THENCE 0.2 KM (0.10 MI) EASTERLY ALONG A PAVED ROAD, THENCE
 HV9070'0.3 KM (0.20 MI) NORTHERLY ALONG 4TH AVENUE, 108.0 M (354.3 FT) EAST
 HV9070'OF A REVIEWING STAND, AND 43.0 M (141.1 FT) WEST OF THE AVENUE
 HV9070'CENTERLINE.  NOTE--ACCESS TO THE DATUM POINT IS THROUGH A 5-INCH LOGO
 HV9070'CAP.
 HV9070
 HV9070                          STATION RECOVERY (2003)
 HV9070
 HV9070'RECOVERY NOTE BY DAFT MCCUNE WALKER INCORPORATED 2003 (JMS)
 HV9070'THIS IS A HIGH SECURITY AREA AND EXTENSIVE VEHICLE AND PERSONAL
 HV9070'INFORMATION MUST BE SENT PRIOR TO ACCESS TO THE MILITARY GROUNDS.
 HV9070'INSPECTIONS WILL BE PERFORMED UPON ENTRY TO THE PROPERTY.
 HV9070
 HV9070                          STATION RECOVERY (2009)
 HV9070
 HV9070'RECOVERY NOTE BY JMT ENGINEERING 2009 (GPS)
 HV9070'FD USED FOR GPS STATIC
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4331 ***********************************************************************
 HV4331  DESIGNATION -  PARK USE 1932
 HV4331  PID         -  HV4331
 HV4331  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4331  COUNTRY     -  US
 HV4331  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4331
 HV4331                         *CURRENT SURVEY CONTROL
 HV4331  ______________________________________________________________________
 HV4331* NAD 83(1993) POSITION- 38 53 35.18145(N) 077 03 20.73798(W)   ADJUSTED
 HV4331* NAVD 88 ORTHO HEIGHT -     6.    (meters)       20.    (feet) SCALED
 HV4331  ______________________________________________________________________
 HV4331  GEOID HEIGHT    -        -32.056 (meters)                     GEOID18
 HV4331  LAPLACE CORR    -         -2.54  (seconds)                    DEFLEC18
 HV4331  HORZ ORDER      -  THIRD
 HV4331
 HV4331.The horizontal coordinates were established by classical geodetic methods
 HV4331.and adjusted by the National Geodetic Survey in November 1994.
 HV4331
 HV4331.The orthometric height was scaled from a topographic map.
 HV4331
 HV4331.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4331.GEOID18 height accuracy estimate available here.
 HV4331
 HV4331.Click photographs - Photos may exist for this station.
 HV4331
 HV4331.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4331
 HV4331. The following values were computed from the NAD 83(1993) position.
 HV4331
 HV4331;                    North         East     Units Scale Factor Converg.
 HV4331;SPC MD       -   136,141.485   395,162.647   MT  0.99994989   -0 02 06.0
 HV4331;SPC MD       -   446,657.52  1,296,462.78   sFT  0.99994989   -0 02 06.0
 HV4331;SPC VA N     - 2,137,120.382 3,625,287.108   MT  0.99995992   +0 54 05.0
 HV4331;SPC VA N     - 7,011,535.79 11,893,962.79   sFT  0.99995992   +0 54 05.0
 HV4331;UTM  18      - 4,306,923.242   321,712.373   MT  0.99999142   -1 17 27.9
 HV4331
 HV4331!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4331!SPC MD       -   1.00000413  x   0.99994989  =   0.99995402
 HV4331!SPC VA N     -   1.00000413  x   0.99995992  =   0.99996405
 HV4331!UTM  18      -   1.00000413  x   0.99999142  =   0.99999555
 HV4331
 HV4331:                Primary Azimuth Mark                     Grid Az
 HV4331:SPC MD       -  ABUTMENT                                 152 14 44.1
 HV4331:SPC VA N     -  ABUTMENT                                 151 18 33.1
 HV4331:UTM  18      -  ABUTMENT                                 153 30 06.0
 HV4331
 HV4331_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2171206923(NAD 83)
 HV4331
 HV4331|---------------------------------------------------------------------|
 HV4331| PID    Reference Object                     Distance      Geod. Az  |
 HV4331|                                                           dddmmss.s |
 HV4331| HV4282 ABUTMENT                            APPROX. 0.6 KM 1521238.1 |
 HV4331| HV4300 F USE 1932                          355.905 METERS 26811     |
 HV4331| HV4299 BASE                                481.248 METERS 3112711.5 |
 HV4331| HV4326 CRANFORD                            312.309 METERS 34723     |
 HV4331|---------------------------------------------------------------------|
 HV4331
 HV4331                          SUPERSEDED SURVEY CONTROL
 HV4331
 HV4331  NAD 83(1991)-  38 53 35.18020(N)    077 03 20.73951(W) AD(       ) 3
 HV4331  NAD 83(1986)-  38 53 35.17993(N)    077 03 20.75006(W) AD(       ) 3
 HV4331  NAD 27      -  38 53 34.78000(N)    077 03 21.82600(W) AD(       ) 3
 HV4331
 HV4331.Superseded values are not recommended for survey control.
 HV4331
 HV4331.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4331.See file dsdata.pdf to determine how the superseded data were derived.
 HV4331
 HV4331_MARKER: Z = SEE DESCRIPTION
 HV4331_SETTING: 0 = UNSPECIFIED SETTING
 HV4331_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4331
 HV4331  HISTORY     - Date     Condition        Report By
 HV4331  HISTORY     - 1932     MONUMENTED       USACE
 HV4331  HISTORY     - 1946     GOOD             CGS
 HV4331
 HV4331                          STATION DESCRIPTION
 HV4331
 HV4331'DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4331'STATION SITE IS ON THE DISTRICT OF COLUMBIA BANK OF THE
 HV4331'POTOMAC RIVER, IN THE UPRIVER PART OF WEST POTOMAC PARK, ABOVE
 HV4331'MEMORIAL BRIDGE, AND ABEAST OF THE DOWNSTREAM END OF ROOSEVELT
 HV4331'ISLAND, AND ABOUT 400 FEET N ALONG THE SIDEWALK ALONG ROCK
 HV4331'CREEK PARKWAY FROM THE INTERSECTION OF THE CENTER LINE OF
 HV4331'CONSTITUTION AVENUE AND A CIRCULAR FLOWER BED ON A BULGE IN
 HV4331'THE SEA WALL ALONG THE RIVER.  STATION IS A STANDARD U.S.E.
 HV4331'TABLET SET IN W EDGE OF SEA WALL AND DIRECTLY OVER MONUMENT
 HV4331'134.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1848 ***********************************************************************
 HV1848  DESIGNATION -  PAUL JONES
 HV1848  PID         -  HV1848
 HV1848  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1848  COUNTRY     -  US
 HV1848  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1848
 HV1848                         *CURRENT SURVEY CONTROL
 HV1848  ______________________________________________________________________
 HV1848* NAD 83(1986) POSITION- 38 53 17.85   (N) 077 02 22.10   (W)   HD_HELD1
 HV1848* NAVD 88 ORTHO HEIGHT -     3.058 (meters)       10.03  (feet) ADJUSTED
 HV1848  ______________________________________________________________________
 HV1848  GEOID HEIGHT    -        -32.085 (meters)                     GEOID18
 HV1848  DYNAMIC HEIGHT  -          3.056 (meters)       10.03  (feet) COMP
 HV1848  MODELED GRAVITY -    980,097.1   (mgal)                       NAVD 88
 HV1848
 HV1848  VERT ORDER      -  FIRST     CLASS II
 HV1848
 HV1848.The horizontal coordinates were determined by differentially corrected
 HV1848.hand held GPS observations or other comparable positioning techniques
 HV1848.and have an estimated accuracy of +/- 3 meters.
 HV1848
 HV1848.The orthometric height was determined by differential leveling and
 HV1848.adjusted by the NATIONAL GEODETIC SURVEY
 HV1848.in April 2010.
 HV1848
 HV1848.No vertical observational check was made to the station.
 HV1848
 HV1848.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1848.GEOID18 height accuracy estimate available here.
 HV1848
 HV1848.Click photographs - Photos may exist for this station.
 HV1848
 HV1848.The dynamic height is computed by dividing the NAVD 88
 HV1848.geopotential number by the normal gravity value computed on the
 HV1848.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1848.degrees latitude (g = 980.6199 gals.).
 HV1848
 HV1848.The modeled gravity was interpolated from observed gravity values.
 HV1848
 HV1848
 HV1848_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2311306357(NAD 83)
 HV1848
 HV1848                          SUPERSEDED SURVEY CONTROL
 HV1848
 HV1848  NAVD 88 (02/03/93)    3.060  (m)           10.04   (f) SUPERSEDED  1 2
 HV1848  NAVD 88 (06/15/91)    3.060  (m)           10.04   (f) SUPERSEDED  1 2
 HV1848  NGVD 29 (08/12/92)    3.293  (m)           10.80   (f) ADJUSTED    1 2
 HV1848  NGVD 29 (??/??/87)    3.296  (m)           10.81   (f) SUPERSEDED  1 2
 HV1848
 HV1848.Superseded values are not recommended for survey control.
 HV1848
 HV1848.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1848.See file dsdata.pdf to determine how the superseded data were derived.
 HV1848
 HV1848_MARKER: Z = SEE DESCRIPTION
 HV1848_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1848_SP_SET: STEP
 HV1848_MARK LOGO: NONE
 HV1848_PROJECTION: FLUSH
 HV1848_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1848_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1848_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1848+SATELLITE: SATELLITE OBSERVATIONS - November 04, 2020
 HV1848
 HV1848  HISTORY     - Date     Condition        Report By
 HV1848  HISTORY     - UNK      MONUMENTED       CGS
 HV1848  HISTORY     - 1941     GOOD             CGS
 HV1848  HISTORY     - 1956     GOOD             CGS
 HV1848  HISTORY     - 19920513 GOOD             NGS
 HV1848  HISTORY     - 19980928 GOOD             NGS
 HV1848  HISTORY     - 20040612 GOOD             NGS
 HV1848  HISTORY     - 20070717 GOOD             USACE
 HV1848  HISTORY     - 20081222 GOOD             NGS
 HV1848  HISTORY     - 20100321 GOOD             GEOCAC
 HV1848  HISTORY     - 20120315 GOOD             GEOCAC
 HV1848  HISTORY     - 20180718 GOOD             USPSQD
 HV1848  HISTORY     - 20201104 GOOD             NGS
 HV1848
 HV1848                          STATION DESCRIPTION
 HV1848
 HV1848'DESCRIBED BY COAST AND GEODETIC SURVEY 1941
 HV1848'AT WASHINGTON.
 HV1848'AT WASHINGTON, IN WEST POTOMAC PARK, AT THE FOOT OF SEVENTEENTH
 HV1848'STREET, AT THE JOHN PAUL JONES MONUMENT, ON THE NORTH SIDE OF
 HV1848'THE MONUMENT, ON THE NORTHEAST CORNER OF THE PROJECTING WALL AT
 HV1848'THE WEST END OF THE STEPS, AND ABOUT 2 FEET ABOVE THE SIDEWALK.
 HV1848'AN UNMARKED POINT.
 HV1848
 HV1848                          STATION RECOVERY (1956)
 HV1848
 HV1848'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956
 HV1848'RECOVERED IN GOOD CONDITION.
 HV1848
 HV1848                          STATION RECOVERY (1992)
 HV1848
 HV1848'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1848'IN WASHINGTON, D.C., AT THE INTERSECTION OF 17TH STREET AND
 HV1848'INDEPENDENCE AVENUE, THE POINT LEVELED WAS THE NORTHEAST CORNER OF
 HV1848'THE PROJECTING WALL AT THE WEST END OF THE STEPS ON THE NORTH SIDE OF
 HV1848'THE JOHN PAUL JONES MONUMENT NEAR THE CENTER OF A TRIANGLE FORMED BY
 HV1848'THE INTERSECTION, AND 0.3 M (1.0 FT) ABOVE THE LEVEL OF A SIDEWALK.
 HV1848
 HV1848                          STATION RECOVERY (1998)
 HV1848
 HV1848'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1998 (RLA)
 HV1848'RECOVERED AS DESCRIBED.
 HV1848
 HV1848                          STATION RECOVERY (2004)
 HV1848
 HV1848'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2004 (DW)
 HV1848'RECOVERED IN GOOD CONDITION.
 HV1848
 HV1848                          STATION RECOVERY (2007)
 HV1848
 HV1848'RECOVERY NOTE BY US ARMY CORPS OF ENGINEERS 2007 (JBC)
 HV1848'RECOVERED IN GOOD CONDITION.
 HV1848
 HV1848                          STATION RECOVERY (2008)
 HV1848
 HV1848'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV1848'RECOVERED AS DESCRIBED.
 HV1848
 HV1848                          STATION RECOVERY (2010)
 HV1848
 HV1848'RECOVERY NOTE BY GEOCACHING 2010 (MFM)
 HV1848'RECOVERED IN GOOD CONDITION.
 HV1848
 HV1848                          STATION RECOVERY (2012)
 HV1848
 HV1848'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV1848'RECOVERED IN GOOD CONDITION.
 HV1848
 HV1848                          STATION RECOVERY (2018)
 HV1848
 HV1848'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV1848'RECOVERED IN GOOD CONDITION.
 HV1848
 HV1848                          STATION RECOVERY (2020)
 HV1848
 HV1848'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JKH)
 HV1848'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1951 ***********************************************************************
 HV1951  DESIGNATION -  PIER CLOCK HOUSE
 HV1951  PID         -  HV1951
 HV1951  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1951  COUNTRY     -  US
 HV1951  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1951
 HV1951                         *CURRENT SURVEY CONTROL
 HV1951  ______________________________________________________________________
 HV1951* NAD 83(1986) POSITION- 38 55 16.     (N) 077 03 56.     (W)   SCALED
 HV1951* NAVD 88 ORTHO HEIGHT -    86.185 (meters)      282.76  (feet) ADJUSTED
 HV1951  ______________________________________________________________________
 HV1951  GEOID HEIGHT    -        -31.992 (meters)                     GEOID18
 HV1951  DYNAMIC HEIGHT  -         86.139 (meters)      282.61  (feet) COMP
 HV1951  MODELED GRAVITY -    980,089.0   (mgal)                       NAVD 88
 HV1951
 HV1951  VERT ORDER      -  SECOND    CLASS 0
 HV1951
 HV1951.The horizontal coordinates were scaled from a map and have
 HV1951.an estimated accuracy of +/- 6 seconds.
 HV1951
 HV1951.The orthometric height was determined by differential leveling and
 HV1951.adjusted by the NATIONAL GEODETIC SURVEY
 HV1951.in June 1991.
 HV1951
 HV1951.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1951.GEOID18 height accuracy estimate available here.
 HV1951
 HV1951.Click photographs - Photos may exist for this station.
 HV1951
 HV1951.The dynamic height is computed by dividing the NAVD 88
 HV1951.geopotential number by the normal gravity value computed on the
 HV1951.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1951.degrees latitude (g = 980.6199 gals.).
 HV1951
 HV1951.The modeled gravity was interpolated from observed gravity values.
 HV1951
 HV1951
 HV1951_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ209100(NAD 83)
 HV1951
 HV1951                          SUPERSEDED SURVEY CONTROL
 HV1951
 HV1951  NGVD 29 (11/26/84)   86.410  (m)          283.50   (f) ADJUSTED    2 0
 HV1951
 HV1951.Superseded values are not recommended for survey control.
 HV1951
 HV1951.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1951.See file dsdata.pdf to determine how the superseded data were derived.
 HV1951
 HV1951_MARKER: X = CHISELED CROSS
 HV1951_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1951_SP_SET: CONCRETE PIER
 HV1951_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1951
 HV1951  HISTORY     - Date     Condition        Report By
 HV1951  HISTORY     - UNK      MONUMENTED       CGS
 HV1951  HISTORY     - 1927     GOOD             CGS
 HV1951
 HV1951                          STATION DESCRIPTION
 HV1951
 HV1951'DESCRIBED BY COAST AND GEODETIC SURVEY 1927
 HV1951'AT WASHINGTON.
 HV1951'LOCATED IN THE CENTER OF THE WEST EDGE OF THE NEAREST CONCRETE
 HV1951'PIER NE OF THE CENTER OF THE CLOCK HOUSE.  NOTE-- IN THE VICINITY
 HV1951'OF THE NAVAL OBSERVATORY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4672 ***********************************************************************
 HV4672  DESIGNATION -  PILES 1913
 HV4672  PID         -  HV4672
 HV4672  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4672  COUNTRY     -  US
 HV4672  USGS QUAD   -  ALEXANDRIA (2019)
 HV4672
 HV4672                         *CURRENT SURVEY CONTROL
 HV4672  ______________________________________________________________________
 HV4672* NAD 83(1993) POSITION- 38 50 57.20808(N) 077 01 10.54533(W)   ADJUSTED
 HV4672* NAVD 88 ORTHO HEIGHT -    -0.    (meters)       -0.    (feet) SCALED
 HV4672  ______________________________________________________________________
 HV4672  GEOID HEIGHT    -        -32.183 (meters)                     GEOID18
 HV4672  LAPLACE CORR    -         -2.73  (seconds)                    DEFLEC18
 HV4672  HORZ ORDER      -  THIRD
 HV4672
 HV4672.The horizontal coordinates were established by classical geodetic methods
 HV4672.and adjusted by the National Geodetic Survey in November 1994.
 HV4672
 HV4672.The orthometric height was scaled from a topographic map.
 HV4672
 HV4672.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4672.GEOID18 height accuracy estimate available here.
 HV4672
 HV4672.Click photographs - Photos may exist for this station.
 HV4672
 HV4672.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4672
 HV4672. The following values were computed from the NAD 83(1993) position.
 HV4672
 HV4672;                    North         East     Units Scale Factor Converg.
 HV4672;SPC MD       -   131,269.018   398,298.964   MT  0.99994995   -0 00 44.3
 HV4672;SPC MD       -   430,671.77  1,306,752.52   sFT  0.99994995   -0 00 44.3
 HV4672;SPC VA N     - 2,132,299.776 3,628,502.653   MT  0.99995654   +0 55 26.2
 HV4672;SPC VA N     - 6,995,720.18 11,904,512.45   sFT  0.99995654   +0 55 26.2
 HV4672;UTM  18      - 4,301,983.053   324,741.285   MT  0.99997824   -1 16 01.8
 HV4672
 HV4672!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4672!SPC MD       -   1.00000509  x   0.99994995  =   0.99995504
 HV4672!SPC VA N     -   1.00000509  x   0.99995654  =   0.99996163
 HV4672!UTM  18      -   1.00000509  x   0.99997824  =   0.99998333
 HV4672
 HV4672:                Primary Azimuth Mark                     Grid Az
 HV4672:SPC MD       -  V                                        271 00 43.2
 HV4672:SPC VA N     -  V                                        270 04 32.7
 HV4672:UTM  18      -  V                                        272 16 00.7
 HV4672
 HV4672_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2474101983(NAD 83)
 HV4672
 HV4672|---------------------------------------------------------------------|
 HV4672| PID    Reference Object                     Distance      Geod. Az  |
 HV4672|                                                           dddmmss.s |
 HV4672| HV4712 THEODORE ROOSEVELT HALL FLGSTF      APPROX. 1.6 KM 0081136.4 |
 HV4672| HV4593 LARGE IRON STACK POWERHOUSE         APPROX. 2.9 KM 2610013.7 |
 HV4672| HV4589 IRON CAP STACK                      APPROX. 1.8 KM 2611302.0 |
 HV4672| HV4625 V                                   APPROX. 1.8 KM 2705958.9 |
 HV4672|---------------------------------------------------------------------|
 HV4672
 HV4672                          SUPERSEDED SURVEY CONTROL
 HV4672
 HV4672  NAD 83(1991)-  38 50 57.20656(N)    077 01 10.54663(W) AD(       ) 3
 HV4672  NAD 83(1986)-  38 50 57.20631(N)    077 01 10.55781(W) AD(       ) 3
 HV4672  NAD 27      -  38 50 56.80400(N)    077 01 11.63800(W) AD(       ) 3
 HV4672  USSD        -  38 50 57.14200(N)    077 01 11.46700(W) AD(       ) 3
 HV4672
 HV4672.Superseded values are not recommended for survey control.
 HV4672
 HV4672.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4672.See file dsdata.pdf to determine how the superseded data were derived.
 HV4672
 HV4672_MARKER: H = DRILL HOLE
 HV4672_SETTING: 0 = UNSPECIFIED SETTING
 HV4672_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4672
 HV4672  HISTORY     - Date     Condition        Report By
 HV4672  HISTORY     - 1913     MONUMENTED       CGS
 HV4672  HISTORY     - 1940     SEE DESCRIPTION  CGS
 HV4672
 HV4672                          STATION DESCRIPTION
 HV4672
 HV4672'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4672'STATION IS ON S END OF SEA WALL ON GIESBORO POINT.  A FEW
 HV4672'PILES ARE STILL IN THE WATER BEING REMAINS OF A WHARF WHICH
 HV4672'EXTENDED OUT FROM END OF THIS WALL.
 HV4672'
 HV4672'MARK IS 3/4-INCH DRILLHOLE ABOUT 3 INCHES FROM END OF WALL AND
 HV4672'14 INCHES FROM FRONT.
 HV4672
 HV4672                          STATION RECOVERY (1940)
 HV4672
 HV4672'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV4672'STATION LOST.  THE SEA WALL IS BROKEN OFF AT THIS PLACE, THE
 HV4672'STATION COULD NOT BE FOUND AND IS APPARENTLY DESTROYED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1950 ***********************************************************************
 HV1950  DESIGNATION -  PLATE CLOCK HOUSE
 HV1950  PID         -  HV1950
 HV1950  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1950  COUNTRY     -  US
 HV1950  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1950
 HV1950                         *CURRENT SURVEY CONTROL
 HV1950  ______________________________________________________________________
 HV1950* NAD 83(1986) POSITION- 38 55 16.     (N) 077 03 59.     (W)   SCALED
 HV1950* NAVD 88 ORTHO HEIGHT -    87.161 (meters)      285.96  (feet) ADJUSTED
 HV1950  ______________________________________________________________________
 HV1950  GEOID HEIGHT    -        -31.990 (meters)                     GEOID18
 HV1950  DYNAMIC HEIGHT  -         87.114 (meters)      285.81  (feet) COMP
 HV1950  MODELED GRAVITY -    980,088.8   (mgal)                       NAVD 88
 HV1950
 HV1950  VERT ORDER      -  SECOND    CLASS 0
 HV1950
 HV1950.The horizontal coordinates were scaled from a map and have
 HV1950.an estimated accuracy of +/- 6 seconds.
 HV1950
 HV1950.The orthometric height was determined by differential leveling and
 HV1950.adjusted by the NATIONAL GEODETIC SURVEY
 HV1950.in June 1991.
 HV1950
 HV1950.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1950.GEOID18 height accuracy estimate available here.
 HV1950
 HV1950.Click photographs - Photos may exist for this station.
 HV1950
 HV1950.The dynamic height is computed by dividing the NAVD 88
 HV1950.geopotential number by the normal gravity value computed on the
 HV1950.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1950.degrees latitude (g = 980.6199 gals.).
 HV1950
 HV1950.The modeled gravity was interpolated from observed gravity values.
 HV1950
 HV1950
 HV1950_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ208100(NAD 83)
 HV1950
 HV1950                          SUPERSEDED SURVEY CONTROL
 HV1950
 HV1950  NGVD 29 (11/26/84)   87.386  (m)          286.70   (f) ADJUSTED    2 0
 HV1950
 HV1950.Superseded values are not recommended for survey control.
 HV1950
 HV1950.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1950.See file dsdata.pdf to determine how the superseded data were derived.
 HV1950
 HV1950_MARKER: Z = SEE DESCRIPTION
 HV1950_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1950_SP_SET: RADIATOR
 HV1950_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1950
 HV1950  HISTORY     - Date     Condition        Report By
 HV1950  HISTORY     - UNK      MONUMENTED       CGS
 HV1950  HISTORY     - 1927     GOOD             CGS
 HV1950
 HV1950                          STATION DESCRIPTION
 HV1950
 HV1950'DESCRIBED BY COAST AND GEODETIC SURVEY 1927
 HV1950'AT WASHINGTON.
 HV1950'THE CENTER OF HORIZONTAL BRASS PLATE MOUNTED UPON A PEDESTAL OF
 HV1950'BRASS TUBING, PROJECTING VERTICALLY FROM THE CENTER OF A CIRCULAR
 HV1950'RADIATOR IN CENTER OF CLOCK HOUSE.  NOTE-- IN THE VICINITY OF
 HV1950'THE NAVAL OBSERVATORY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1998 ***********************************************************************
 HV1998  DESIGNATION -  POTOMAC PARK NW BASE
 HV1998  PID         -  HV1998
 HV1998  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1998  COUNTRY     -  US
 HV1998  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1998
 HV1998                         *CURRENT SURVEY CONTROL
 HV1998  ______________________________________________________________________
 HV1998* NAD 83(1993) POSITION- 38 52 40.91003(N) 077 02 02.11671(W)   ADJUSTED
 HV1998* NAVD 88 ORTHO HEIGHT -     3.36  (+/-2cm)       11.0   (feet) VERTCON3
 HV1998  ______________________________________________________________________
 HV1998  GEOID HEIGHT    -        -32.113 (meters)                     GEOID18
 HV1998  LAPLACE CORR    -         -2.76  (seconds)                    DEFLEC18
 HV1998  HORZ ORDER      -  FIRST
 HV1998  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1998
 HV1998.The horizontal coordinates were established by classical geodetic methods
 HV1998.and adjusted by the National Geodetic Survey in November 1994.
 HV1998
 HV1998.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1998.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1998
 HV1998.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1998.GEOID18 height accuracy estimate available here.
 HV1998
 HV1998.The vertical order pertains to the NGVD 29 superseded value.
 HV1998
 HV1998.Click photographs - Photos may exist for this station.
 HV1998
 HV1998.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1998
 HV1998. The following values were computed from the NAD 83(1993) position.
 HV1998
 HV1998;                    North         East     Units Scale Factor Converg.
 HV1998;SPC MD       -   134,467.069   397,056.628   MT  0.99994985   -0 01 16.6
 HV1998;SPC MD       -   441,164.04  1,302,676.62   sFT  0.99994985   -0 01 16.6
 HV1998;SPC VA N     - 2,135,477.125 3,627,208.216   MT  0.99995870   +0 54 54.0
 HV1998;SPC VA N     - 7,006,144.53 11,900,265.62   sFT  0.99995870   +0 54 54.0
 HV1998;UTM  18      - 4,305,207.653   323,569.270   MT  0.99998331   -1 16 37.0
 HV1998
 HV1998!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1998!SPC MD       -   1.00000451  x   0.99994985  =   0.99995436
 HV1998!SPC VA N     -   1.00000451  x   0.99995870  =   0.99996321
 HV1998!UTM  18      -   1.00000451  x   0.99998331  =   0.99998782
 HV1998
 HV1998:                Primary Azimuth Mark                     Grid Az
 HV1998:SPC MD       -  NEAR                                     188 31 27.8
 HV1998:SPC VA N     -  NEAR                                     187 35 17.2
 HV1998:UTM  18      -  NEAR                                     189 46 48.2
 HV1998
 HV1998_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2356905207(NAD 83)
 HV1998
 HV1998|---------------------------------------------------------------------|
 HV1998| PID    Reference Object                     Distance      Geod. Az  |
 HV1998|                                                           dddmmss.s |
 HV1998| HV1999 POTOMAC PARK NW BASE RM 2            35.330 METERS 01341     |
 HV1998| HV4264 OLD POST OFFICE FINIAL              APPROX. 1.9 KM 0164909.9 |
 HV1998| HV4358 ST DOMINIC CHURCH SPIRE             APPROX. 1.3 KM 0650024.7 |
 HV1998| HV4724 ST ELIZABETHS ASYLUM WHITE STK      APPROX. 4.1 KM 1340753.6 |
 HV1998| HV4726 ST ELIZABETHS ASYLUM RED STK        APPROX. 4.1 KM 1344050.2 |
 HV1998| HV7905 NEAR                                APPROX. 3.6 KM 1883011.2 |
 HV1998| HV4441 RR                                  238.178 METERS 22016     |
 HV1998| HV3621 ARLINGTON CEMETERY LEE MANSION      APPROX. 3.3 KM 2755924.4 |
 HV1998| DC7066 POTOMAC PARK NW BASE RM 1            23.002 METERS 28604     |
 HV1998| HV3990 COL                                 APPROX. 4.7 KM 3135905.1 |
 HV1998|---------------------------------------------------------------------|
 HV1998
 HV1998                          SUPERSEDED SURVEY CONTROL
 HV1998
 HV1998  NAD 83(1991)-  38 52 40.90869(N)    077 02 02.11812(W) AD(       ) 1
 HV1998  NAD 83(1986)-  38 52 40.90838(N)    077 02 02.12891(W) AD(       ) 1
 HV1998  NAD 27      -  38 52 40.50700(N)    077 02 03.20700(W) AD(       ) 1
 HV1998  USSD        -  38 52 40.84400(N)    077 02 03.03800(W) AD(       ) 3
 HV1998  NGVD 29               3.61   (m)           11.8    (f) LEVELING    3  
 HV1998  NGVD 29 (11/26/84)    3.607  (m)           11.83   (f) ADJUSTED    1 2
 HV1998
 HV1998.Superseded values are not recommended for survey control.
 HV1998
 HV1998.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1998.See file dsdata.pdf to determine how the superseded data were derived.
 HV1998
 HV1998_MARKER: DS = TRIANGULATION STATION DISK
 HV1998_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1998_MARK LOGO: CGS
 HV1998_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1998+STABILITY: SURFACE MOTION
 HV1998
 HV1998  HISTORY     - Date     Condition        Report By
 HV1998  HISTORY     - 1913     MONUMENTED       CGS
 HV1998  HISTORY     - 1924     GOOD             CGS
 HV1998  HISTORY     - 1926     GOOD             PBPP
 HV1998  HISTORY     - 1934     GOOD             CGS
 HV1998  HISTORY     - 1935     GOOD             CGS
 HV1998  HISTORY     - 1938     GOOD             CGS
 HV1998  HISTORY     - 1946     GOOD             CGS
 HV1998  HISTORY     - 1956     MARK NOT FOUND   CGS
 HV1998  HISTORY     - 1959     MARK NOT FOUND   CGS
 HV1998  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV1998
 HV1998                          STATION DESCRIPTION
 HV1998
 HV1998'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV1998'STATION IS LOCATED ABOUT 75 METERS S OF THE RAILROAD AND A
 HV1998'LITTLE NEARER THE MAIN RIVER THAN THE HARBOR.  BY SIGHTING
 HV1998'ALONG THE N FACE OF THE WALL AT THE MIDDLE OPENING UNDER THE
 HV1998'RAILROAD, THE PIER IS ENTIRELY VISIBLE.  THE OPENINGS UNDER
 HV1998'THE RAILROAD AT EITHER SIDE OF THE POINT ARE USED FOR ROADWAYS,
 HV1998'BUT THIS MIDDLE OPENING IS NOT SO USED AT PRESENT.
 HV1998'
 HV1998'A DRILL HOLE IN THE RIVER WALL IS 238.12 FROM NORTHWEST BASE
 HV1998'AT AN AZIMUTH OF 40 DEG 16 MIN.  A CONCRETE BLOCK 3 FEET SQUARE
 HV1998'PLACED 2 FEET BELOW GROUND WITH A REGULAR TRIANGLE STATION MARK
 HV1998'INDICATING CENTER.  THROUGH ABOUT 6 INCHES OF DIRT AND A PIER
 HV1998'OF CONCRETE PLACED ON TOP 2-1/2 FEET SQUARE AT BOTTOM OR 1-1/2
 HV1998'FEET SQUARE AT TOP, THE TOP BEING SOME 1-1/2 FEET ABOVE
 HV1998'GROUND.  THE CENTER MARKED BY REGULAR TRIANGULATIN STATION
 HV1998'MARK.
 HV1998
 HV1998                          STATION RECOVERY (1924)
 HV1998
 HV1998'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1924 (EWE)
 HV1998'STATION RECOVERED AS DESCRIBED.  STATION IS 15 METERS E OF
 HV1998'THE CENTER LINE OF EASTERN ROAD OF THE TOURIST CAMP.
 HV1998
 HV1998                          STATION RECOVERY (1926)
 HV1998
 HV1998'RECOVERY NOTE BY PUB BLDGS AND PARKS 1926
 HV1998'AT WASHINGTON.
 HV1998'AT WASHINGTON, IN EAST POTOMAC PARK, NEAR THE NORTH CORNER OF
 HV1998'THE TOURIST CAMP, 65 YARDS EAST OF THE CAMP OFFICE, 41 FEET
 HV1998'NORTHEAST OF MAIN STREET, 118 FEET SOUTHEAST OF THE SOUTHEAST
 HV1998'END OF THE BUILDING KNOWN IN 1944 AS THE ICE CREAM BAR, AND 2
 HV1998'YARDS SOUTHWEST OF A LINE OF MAPLE TREES ALONG THE NORTHEAST
 HV1998'BOUNDARY OF THE TOURIST CAMP.  A STANDARD TRIANGULATION-STATION
 HV1998'DISK, SET IN THE TOP OF AN 18-INCH-SQUARE BLOCK OF CONCRETE
 HV1998'PROJECTING ABOUT 2 FEET ABOVE GROUND.  NOTE-- LEVELING BY THE
 HV1998'NATIONAL CAPITAL PARK SURVEY OFFICE HAS SHOWN THAT SOME OF THEM
 HV1998'HAVE SETTLED.  USE WITH CAUTION.  MARK PREVIOUSLY DESIGNATED
 HV1998'POTOMAC PARK NORTHWEST BASE=EP 2=TIDAL MARK.
 HV1998
 HV1998                          STATION RECOVERY (1934)
 HV1998
 HV1998'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1934 (JB)
 HV1998'THIS STATION IS LOCATED 41 FEET E OF MAINE STREET IN THE
 HV1998'POTOMAC PARK TOURIST CAMP 71.90 FEET S OF THE ICE CREAM BAR
 HV1998'BUILDING, 6 FEET W OF THE LINE OF MAPLE TREES THAT FORM A
 HV1998'SCREEN AROUND THE TOURIST CAMP.  MARK IS SET IN BLOCK OF CONCRETE
 HV1998'18 BY 18 INCHES AND PROJECTS 2 FEET ABOVE THE GROUND.
 HV1998'
 HV1998'REFERENCE MARK NO. 1 IS LOCATED 75.51 FEET E OF THE STATION,
 HV1998'SET IN THE S CURB OF THE SECOND DRIVEWAY S OF CONNECTICUT
 HV1998'STREET, 6 INCHES W OF THE NE CORNER OF THE SECOND CABIN S
 HV1998'OF CONNECTICUT STREET.
 HV1998'
 HV1998'REFERENCE MARK NO. 2 IS LOCATED 91.90 FEET N OF THE STATION,
 HV1998'0.6 FOOT S OF THE S WALL OF THE BUILDING CALLED THE ICE
 HV1998'CREAM BAR, 12.5 FEET W OF THE SW CORNER ABOUT 6 FEET E OF THE
 HV1998'SE CORNER OF THE BUILDING.  MARK IS 1- BY 1-FOOT BLOCK OF
 HV1998'CONCRETE AND PROJECTS 6 INCHES.  A 64-FOOT TOWER WAS USED.
 HV1998'
 HV1998'TO REACH FROM THE WASHINGTON MONUMENT FOLLOW U.S. HIGHWAY 1
 HV1998'S TO THE POTOMAC PARK TOURIST CAMP SIGN TURN LEFT INTO CAMP
 HV1998'GROUNDS, GO S PAST THE OFFICE BUILDING AND THE STATION IS
 HV1998'ON THE LEFT SIDE OF MAINE STREET, 71 FEET S OF THE LAST BUILDING
 HV1998'ON THE LEFT.
 HV1998
 HV1998                          STATION RECOVERY (1935)
 HV1998
 HV1998'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV1998'THE STATION AND TWO REFERENCE MARKS WERE RECOVERED IN GOOD
 HV1998'CONDITION.  A DISCREPANCY WAS FOUND IN THE DISTANCE TO
 HV1998'REFERENCE MARK NO. 2.  THE STATION IS LOCATED ON THE GROUNDS
 HV1998'OF THE POTOMAC PARK TOURIST CAMP, ON THE NE SIDE OF THE CAMP,
 HV1998'ABOUT 60 METERS SE OF THE CAMP OFFICE, 12.5 METERS E OF MAINE
 HV1998'STREET, 36 METERS S OF THE S END OF A BUILDING KNOWN AS THE
 HV1998'ICE CREAM BAR, AND 2 METERS W OF THE LINE OF MAPLE TREES
 HV1998'THAT FORM A SCREEN ALONG THE E SIDE OF THE CAMP.  THE MARK
 HV1998'IS A STANDARD DISK SET IN THE TOP OF A CONCRETE BLOCK 18
 HV1998'BY 18 INCHES THAT PROJECTS ABOUT 2 FEET ABOVE GROUND.
 HV1998'
 HV1998'REFERENCE MARK NO. 1 IS W OF THE STATION, ACROSS MAINE STREET,
 HV1998'SET IN THE S CURB OF THE SECOND DRIVEWAY S OF CONNECTICUT
 HV1998'STREET, AND 0.015 METER E OF THE NE CORNER OF THE PORCH OF
 HV1998'CABIN A30.  IT IS A STANDARD REFERENCE DISK.
 HV1998'
 HV1998'REFERENCE MARK NO. 2 IS N OF THE STATION AT THE S END OF THE
 HV1998'ICE CREAM BAR, 4 METERS W OF THE SE CORNER AND 2 METERS E
 HV1998'OF THE SW CORNER.  IT IS A STANDARD BRONZE DISK SET IN CONCRETE,
 HV1998'
 HV1998'THE DIRECTION TO THE REFERENCE MARK FOR STATION WALK WAS
 HV1998'DETERMINED SO THAT A TRAVERSE CONNECTION MAY BE MADE.  STATION
 HV1998'WALK WAS OBSTRUCTED TO THE TOWER.
 HV1998
 HV1998                          STATION RECOVERY (1938)
 HV1998
 HV1998'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV1998'STATION MARK RECOVERED.  REFERENCE MARKS NOT SEARCHED FOR.
 HV1998'PREFERENCE SHOULD BE GIVEN TO THE 1935 RECOVERY NOTE OVER THE
 HV1998'1934 RECOVERY NOTE, SINCE THE LATTER CONTAINS TWO LARGE ERRORS
 HV1998'IN DIRECTION.  THE 1935 RECOVERY NOTE IS, ITSELF, NOT PERFECTLY
 HV1998'ORIENTED.  WHAT WAS CONSIDERED A N DIRECTION IN BOTH THE 1934
 HV1998'AND 1935 RECOVERY NOTES WAS ACTUALLY A NW DIRECTION AND ALL THE
 HV1998'OTHER DIRECTIONS REFERRING TO POINTS OF THE COMPASS ARE IN
 HV1998'ERROR ACCORDINGLY, THROUGHOUT THE DESCRIPTION.  THIS MAY BE
 HV1998'READILY CHECKED BY COMPARING THE AZIMUTH TO THE REFERENCE
 HV1998'MARKS AS GIVEN IN THE OBSERVED DIRECTIONS, TO THE DIRECTIONS
 HV1998'TO THE REFERENCE MARKS ACCORDING TO COMPASS AS GIVEN IN THE
 HV1998'BODY OF THE WRITTEN PART OF THE DESCRIPTION.
 HV1998
 HV1998                          STATION RECOVERY (1946)
 HV1998
 HV1998'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV1998'STATION RECOVERED AS DESCRIBED AND FOUND TO BE IN GOOD
 HV1998'CONDITION.  REFERENCE MARK 2 RECOVERED IN GOOD CONDITION.
 HV1998'REFERENCE MARK 1 NOT FOUND.  CABIN NUMBERS ARE CHANGED.
 HV1998'DESCRIPTION IS ADEQUATE.
 HV1998
 HV1998                          STATION RECOVERY (1956)
 HV1998
 HV1998'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956
 HV1998'MARK NOT FOUND.
 HV1998
 HV1998                          STATION RECOVERY (1959)
 HV1998
 HV1998'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (BFL)
 HV1998'STATION AND R.M. 1 WERE SEARCHED FOR BUT NOT RECOVERED.  STATION
 HV1998'SITE IS COVERED WITH FILL SO BOTH STATION AND SUB SURFACE
 HV1998'MARKS COULD STILL EXIST.
 HV1998'
 HV1998'ORIGINAL CURBING IN WHICH R.M. 1 WAS SET SEEMS TO HAVE BEEN
 HV1998'REPLACED BY NEWER CURBING.
 HV1998'
 HV1998'R.M. 2 WAS RECOVERED AS DESCRIBED.
 HV1998
 HV1998                          STATION RECOVERY (1971)
 HV1998
 HV1998'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1998'THE STATION WAS NOT RECOVERED, NEITHER WERE REFERENCE MARK
 HV1998'NO. 1 OR REFERENCE MARK NO. 2.  CONSTRUCTION IS BEING DONE IN
 HV1998'THE AREA AND AT THE SITE OF THIS STATION AND THE MARKS ARE
 HV1998'PRESUMED LOST.
 HV1998'
 HV1998'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DIST.
 HV1998'OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1999 ***********************************************************************
 HV1999  DESIGNATION -  POTOMAC PARK NW BASE RM 2
 HV1999  PID         -  HV1999
 HV1999  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1999  COUNTRY     -  US
 HV1999  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1999
 HV1999                         *CURRENT SURVEY CONTROL
 HV1999  ______________________________________________________________________
 HV1999* NAD 83(1986) POSITION- 38 52 42.02   (N) 077 02 01.77   (W)   HD_HELD1
 HV1999* NAVD 88 ORTHO HEIGHT -     2.845 (meters)        9.33  (feet) ADJUSTED
 HV1999  ______________________________________________________________________
 HV1999  GEOID HEIGHT    -        -32.112 (meters)                     GEOID18
 HV1999  DYNAMIC HEIGHT  -          2.843 (meters)        9.33  (feet) COMP
 HV1999  MODELED GRAVITY -    980,097.1   (mgal)                       NAVD 88
 HV1999
 HV1999  VERT ORDER      -  FIRST     CLASS II
 HV1999
 HV1999.The horizontal coordinates were determined by differentially corrected
 HV1999.hand held GPS observations or other comparable positioning techniques
 HV1999.and have an estimated accuracy of +/- 3 meters.
 HV1999
 HV1999.The orthometric height was determined by differential leveling and
 HV1999.adjusted by the NATIONAL GEODETIC SURVEY
 HV1999.in June 1991.
 HV1999
 HV1999.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1999.GEOID18 height accuracy estimate available here.
 HV1999
 HV1999.Click photographs - Photos may exist for this station.
 HV1999
 HV1999.The dynamic height is computed by dividing the NAVD 88
 HV1999.geopotential number by the normal gravity value computed on the
 HV1999.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1999.degrees latitude (g = 980.6199 gals.).
 HV1999
 HV1999.The modeled gravity was interpolated from observed gravity values.
 HV1999
 HV1999
 HV1999_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2357805241(NAD 83)
 HV1999
 HV1999                          SUPERSEDED SURVEY CONTROL
 HV1999
 HV1999  NGVD 29 (11/26/84)    3.079  (m)           10.10   (f) ADJUSTED    1 2
 HV1999
 HV1999.Superseded values are not recommended for survey control.
 HV1999
 HV1999.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1999.See file dsdata.pdf to determine how the superseded data were derived.
 HV1999
 HV1999_MARKER: DR = REFERENCE MARK DISK
 HV1999_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1999_MARK LOGO: CGS
 HV1999_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1999+STABILITY: SURFACE MOTION
 HV1999
 HV1999  HISTORY     - Date     Condition        Report By
 HV1999  HISTORY     - 1934     MONUMENTED       CGS
 HV1999  HISTORY     - 1956     GOOD             CGS
 HV1999
 HV1999                          STATION DESCRIPTION
 HV1999
 HV1999'DESCRIBED BY COAST AND GEODETIC SURVEY 1956
 HV1999'AT WASHINGTON.
 HV1999'AT WASHINGTON, D.C., AT THE POTOMAC PARK TOURIST CAMP, AT THE
 HV1999'SNACK BAR NORTH ACROSS THE STREET FROM THE TOURIST CAMP OFFICE.
 HV1999'0.6 FT. S OF THE S WALL, 12.5 FT W OF THE SE CORNER AND 6 FT E
 HV1999'OF THE SW CORNER.  A STANDARD REFERENCE MARK BRONZE DISK IS A
 HV1999'1X1 FOOT CONCRETE POST PROJECTING 3 INCHES ABOVE GROUND SURFACE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4719 ***********************************************************************
 HV4719  DESIGNATION -  POTOMAC PARK SE BASE OLD MARK
 HV4719  PID         -  HV4719
 HV4719  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4719  COUNTRY     -  US
 HV4719  USGS QUAD   -  ALEXANDRIA (2019)
 HV4719
 HV4719                         *CURRENT SURVEY CONTROL
 HV4719  ______________________________________________________________________
 HV4719* NAD 83(1993) POSITION- 38 51 25.54819(N) 077 01 20.02137(W)   ADJUSTED
 HV4719* NAVD 88 ORTHO HEIGHT -     2.    (meters)        7.    (feet) SCALED
 HV4719  ______________________________________________________________________
 HV4719  GEOID HEIGHT    -        -32.167 (meters)                     GEOID18
 HV4719  LAPLACE CORR    -         -2.92  (seconds)                    DEFLEC18
 HV4719  HORZ ORDER      -  SECOND
 HV4719
 HV4719.The horizontal coordinates were established by classical geodetic methods
 HV4719.and adjusted by the National Geodetic Survey in November 1994.
 HV4719
 HV4719.The orthometric height was scaled from a topographic map.
 HV4719
 HV4719.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4719.GEOID18 height accuracy estimate available here.
 HV4719
 HV4719.Click photographs - Photos may exist for this station.
 HV4719
 HV4719.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4719
 HV4719. The following values were computed from the NAD 83(1993) position.
 HV4719
 HV4719;                    North         East     Units Scale Factor Converg.
 HV4719;SPC MD       -   132,142.946   398,070.684   MT  0.99994990   -0 00 50.2
 HV4719;SPC MD       -   433,538.98  1,306,003.57   sFT  0.99994990   -0 00 50.2
 HV4719;SPC VA N     - 2,133,169.863 3,628,260.122   MT  0.99995710   +0 55 20.3
 HV4719;SPC VA N     - 6,998,574.79 11,903,716.75   sFT  0.99995710   +0 55 20.3
 HV4719;UTM  18      - 4,302,861.797   324,532.195   MT  0.99997914   -1 16 08.5
 HV4719
 HV4719!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4719!SPC MD       -   1.00000477  x   0.99994990  =   0.99995467
 HV4719!SPC VA N     -   1.00000477  x   0.99995710  =   0.99996187
 HV4719!UTM  18      -   1.00000477  x   0.99997914  =   0.99998391
 HV4719
 HV4719_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2453202861(NAD 83)
 HV4719
 HV4719                          SUPERSEDED SURVEY CONTROL
 HV4719
 HV4719  NAD 83(1991)-  38 51 25.54672(N)    077 01 20.02270(W) AD(       ) 2
 HV4719  NAD 83(1986)-  38 51 25.54649(N)    077 01 20.03376(W) AD(       ) 2
 HV4719  NAD 27      -  38 51 25.14400(N)    077 01 21.11300(W) AD(       ) 2
 HV4719
 HV4719.Superseded values are not recommended for survey control.
 HV4719
 HV4719.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4719.See file dsdata.pdf to determine how the superseded data were derived.
 HV4719
 HV4719
 HV4719  HISTORY     - Date     Condition        Report By
 HV4719  HISTORY     - UNK      MONUMENTED
 HV4719  HISTORY     - 1978     GOOD             ALSTER
 HV4719
 HV4719                          STATION DESCRIPTION
 HV4719
 HV4719'DESCRIBED BY ALSTER AND ASSOCIATES ENGINEERS 1978 (LOC)
 HV4719'POTOMAC PARK SE BASE 1913 RECOVERED GOOD.  (APPEARS.)
 HV4719'
 HV4719'POTOMAC PARK SE BASE NO 3, 1913-1960 RECOVERED GOOD.
 HV4719'
 HV4719'RM NO. 4 NOT STAMPED RECOVERED GOOD.
 HV4719'
 HV4719'CHAINED DISTANCE
 HV4719'POTOMAC PARK SE BASE RM NO. 4 - 128.39 DIFFERENCE +0.1 FOOT.
 HV4719'POTOMAC PARK SE BASE RM NO. 3 - 89.70 DIFFERENCE +0.07 FOOT.
 HV4719'
 HV4719'POSSIBLE SHIFT OF TRIANGULATION STATION.
 HV4719'
 HV4719'DIRECTIONS WITH WILD T-2 (FOUR SETS OF OBSERVATIONS)
 HV4719'DIFFERENCE--ALSO IN PRESENT BOX SCORE, THE MASONIC MEMORIAL IS SSW
 HV4719'NOT SE.
 HV4719'
 HV4719'DISTANCE AND DIRECTION FROM NEAREST TOWN--WASHINGTON D.C. AREA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2015 ***********************************************************************
 HV2015  DESIGNATION -  POTOMAC PARK SOUTHEAST BASE RESET
 HV2015  PID         -  HV2015
 HV2015  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2015  COUNTRY     -  US
 HV2015  USGS QUAD   -  ALEXANDRIA (2019)
 HV2015
 HV2015                         *CURRENT SURVEY CONTROL
 HV2015  ______________________________________________________________________
 HV2015* NAD 83(1993) POSITION- 38 51 25.18093(N) 077 01 20.14320(W)   ADJUSTED
 HV2015* NAVD 88 ORTHO HEIGHT -     1.66  (+/-2cm)        5.4   (feet) VERTCON3
 HV2015  ______________________________________________________________________
 HV2015  GEOID HEIGHT    -        -32.167 (meters)                     GEOID18
 HV2015  LAPLACE CORR    -         -2.92  (seconds)                    DEFLEC18
 HV2015  HORZ ORDER      -  FIRST
 HV2015  VERT ORDER      -  ? (See Below)
 HV2015
 HV2015.The horizontal coordinates were established by classical geodetic methods
 HV2015.and adjusted by the National Geodetic Survey in November 1994.
 HV2015
 HV2015.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV2015.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV2015
 HV2015.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2015.GEOID18 height accuracy estimate available here.
 HV2015
 HV2015.The vertical order pertains to the NGVD 29 superseded value.
 HV2015
 HV2015.Click photographs - Photos may exist for this station.
 HV2015
 HV2015.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2015
 HV2015. The following values were computed from the NAD 83(1993) position.
 HV2015
 HV2015;                    North         East     Units Scale Factor Converg.
 HV2015;SPC MD       -   132,131.622   398,067.744   MT  0.99994990   -0 00 50.3
 HV2015;SPC MD       -   433,501.83  1,305,993.92   sFT  0.99994990   -0 00 50.3
 HV2015;SPC VA N     - 2,133,158.493 3,628,257.367   MT  0.99995710   +0 55 20.2
 HV2015;SPC VA N     - 6,998,537.49 11,903,707.71   sFT  0.99995710   +0 55 20.2
 HV2015;UTM  18      - 4,302,850.540   324,529.007   MT  0.99997916   -1 16 08.6
 HV2015
 HV2015!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2015!SPC MD       -   1.00000479  x   0.99994990  =   0.99995469
 HV2015!SPC VA N     -   1.00000479  x   0.99995710  =   0.99996189
 HV2015!UTM  18      -   1.00000479  x   0.99997916  =   0.99998395
 HV2015
 HV2015:                Primary Azimuth Mark                     Grid Az
 HV2015:SPC MD       -  ALEXANDRIA WASH MASON MEMORIAL           214 38 02.7
 HV2015:SPC VA N     -  ALEXANDRIA WASH MASON MEMORIAL           213 41 52.2
 HV2015:UTM  18      -  ALEXANDRIA WASH MASON MEMORIAL           215 53 21.0
 HV2015
 HV2015_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2452902850(NAD 83)
 HV2015
 HV2015|---------------------------------------------------------------------|
 HV2015| PID    Reference Object                     Distance      Geod. Az  |
 HV2015|                                                           dddmmss.s |
 HV2015| HV4719 POTOMAC PARK SE BASE OLD MARK        11.700 METERS 01432     |
 HV2015| HV4681 ST ELIZABETHS ASYLUM AIR BCN        APPROX. 1.9 KM 0972021.1 |
 HV2015| DC7068 POTOMAC PARK SE BASE RM 1            35.275 METERS 10009     |
 HV2015| HV4724 ST ELIZABETHS ASYLUM WHITE STK      APPROX. 2.0 KM 1051951.5 |
 HV2015| HV4726 ST ELIZABETHS ASYLUM RED STK        APPROX. 2.0 KM 1061311.2 |
 HV2015| DC7070 POTOMAC PARK SE BASE RM 3             2.732 METERS 17811     |
 HV2015| HV4650 BELLEVUE BLACK TANK                 APPROX. 3.7 KM 1812810.3 |
 HV2015| HV4655 BELLEVUE NRL POWERHSE STK           APPROX. 4.0 KM 1852329.6 |
 HV2015| HV4742 ALEXANDRIA GSA CENTER TANK          APPROX. 6.9 KM 1935912.0 |
 HV2015| HV4584 GROVETON AIRWAY BEACON              APPROX.10.7 KM 2092723.0 |
 HV2015| DC7069 POTOMAC PARK SE BASE RM 2            25.040 METERS 21346     |
 HV2015| HV4631 ALEXANDRIA WASH MASON MEMORIAL      APPROX. 6.7 KM 2143712.4 |
 HV2015| DC7071 POTOMAC PARK SE BASE RM               3.910 METERS 28906     |
 HV2015|---------------------------------------------------------------------|
 HV2015
 HV2015                          SUPERSEDED SURVEY CONTROL
 HV2015
 HV2015  NAD 83(1991)-  38 51 25.17946(N)    077 01 20.14454(W) AD(       ) 1
 HV2015  NAD 83(1986)-  38 51 25.17923(N)    077 01 20.15560(W) AD(       ) 1
 HV2015  NAD 27      -  38 51 24.77700(N)    077 01 21.23500(W) AD(       ) 1
 HV2015  NGVD 29 (07/19/86)    1.9    (m)            6.     (f) VERT ANG       
 HV2015  NGVD 29 (11/26/84)    1.912  (m)            6.27   (f) ADJUSTED       
 HV2015
 HV2015.Superseded values are not recommended for survey control.
 HV2015
 HV2015.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2015.See file dsdata.pdf to determine how the superseded data were derived.
 HV2015
 HV2015_MARKER: DS = TRIANGULATION STATION DISK
 HV2015_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV2015_SP_SET: CONCRETE BLOCK
 HV2015_STAMPING: POTOMAC PARK SOUTHEAST BASE 1913 1934
 HV2015_MARK LOGO: CGS
 HV2015_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV2015+STABILITY: SURFACE MOTION
 HV2015
 HV2015  HISTORY     - Date     Condition        Report By
 HV2015  HISTORY     - 1934     MONUMENTED       CGS
 HV2015  HISTORY     - 1935     GOOD             CGS
 HV2015  HISTORY     - 1937     GOOD             CGS
 HV2015  HISTORY     - 1938     GOOD             CGS
 HV2015  HISTORY     - 1946     GOOD             CGS
 HV2015  HISTORY     - 1953     GOOD             CGS
 HV2015  HISTORY     - 1958     GOOD             CGS
 HV2015  HISTORY     - 1959     GOOD             CGS
 HV2015  HISTORY     - 1960     GOOD             CGS
 HV2015  HISTORY     - 1961     GOOD             CGS
 HV2015  HISTORY     - 1965     GOOD             CGS
 HV2015  HISTORY     - 1971     GOOD             NGS
 HV2015  HISTORY     - 1983     MARK NOT FOUND   NGS
 HV2015
 HV2015                          STATION DESCRIPTION
 HV2015
 HV2015'DESCRIBED BY COAST AND GEODETIC SURVEY 1934 (JB)
 HV2015'RE-MARKED SOUTHEAST BASE BY MOVING OLD SURFACE MARK AND ESTABLISHING
 HV2015'NEW CONCRETE BLOCK USING ORIGINAL TABLET.  THE OLD MARK WAS
 HV2015'SETTING ON TOP OF THE GROUND.  THE UNDERGROUND MARK WAS IN GOOD
 HV2015'CONDITION BUT ONLY 4 INCHES UNDER GROUND.  REINFORCED UNDERGROUND
 HV2015'MARK BUT DID NOT DISTURB IT.  STATION MARK WAS FOUND TO BE 0.045
 HV2015'METER ENE OF THE SUB-SURFACE MARK.  STATION MARK WAS RESET AS IT
 HV2015'WAS FOUND (0.45 METER ENE OF SUB-SURFACE MARK).  NEW MARK IS
 HV2015'PYRAMID SHAPED, PROJECTING 2 FEET ABOVE SURFACE OF GROUND.
 HV2015
 HV2015                          STATION RECOVERY (1935)
 HV2015
 HV2015'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV2015'STATION MARK AND TWO REFERENCE MARKS WERE CHECKED.
 HV2015'
 HV2015'STATION IS NEAR THE EXTREME END OF HAINS POINT, IN A GRASSY
 HV2015'PLOT S OF THE S LOOP OF THE SPEEDWAY, 85.8 METERS SW OF THE S
 HV2015'CURB OF THIS ROAD, AND 27.6 METERS NE OF THE NEAREST POINT OF THE
 HV2015'SEA WALL.  THE MARK IS A STANDARD DISK SET IN TOP OF A LARGE
 HV2015'BLOCK OF CONCRETE, ABOUT 24 INCHES SQUARE AT THE BOTTOM, 18
 HV2015'INCHES SQUARE AT THE TOP, AND STANDING ABOUT 24 INCHES ABOVE
 HV2015'GROUND.  THE ORIGINAL DESCRIPTION STATES THAT THE UNDERGROUND
 HV2015'MARK IS AS DESCRIBED.
 HV2015'
 HV2015'REFERENCE MARK NO. 1 IS ESE OF THE STATION, CEMENTED IN THE
 HV2015'CURB OF THE SIDEWALK ALONG THE SEA WALL, 2.94 METERS FROM THE
 HV2015'OUTSIDE EDGE OF THE SEA WALL, AND ABOUT 1 METER E OF A LIGHT POST.
 HV2015'
 HV2015'REFERENCE MARK NO. 2 IS SW OF THE STATION, ALSO CEMENTED IN
 HV2015'THE CURB ALONG THE INSIDE OF THE WALK ALONG THE SEA WALL, 2.94
 HV2015'METERS FROM THE OUTSIDE EDGE OF THE SEA WALL, AND ABOUT 1 METER S
 HV2015'OF A LIGHT POST.
 HV2015'
 HV2015'NO AZIMUTH MARK HAS BEEN ESTABLISHED, BUT THE TOWER OF THE
 HV2015'MASONIC TEMPLE IN ALEXANDRIA MAY BE USED.  THE DIRECTION TO
 HV2015'THIS IS GIVEN IN THE DESCRIPTION OF 1934 BY J. BOWIE, JR.
 HV2015'
 HV2015'IN DISTANCES AND DIRECTIONS TO THE REFERENCE MARKS, IT WILL
 HV2015'BE NOTED THAT THERE IS A DIFFERENCE IN THE ANGLE BETWEEN THE
 HV2015'MARKS AS MEASURED BY J. BOWIE JR.
 HV2015
 HV2015                          STATION RECOVERY (1937)
 HV2015
 HV2015'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1937
 HV2015'AT WASHINGTON.
 HV2015'AT WASHINGTON, IN EAST POTOMAC PARK, NEAR THE EXTREME END OF
 HV2015'HAINS POINT, IN A GRASSY PLOT SOUTH OF THE SOUTH LOOP OF THE
 HV2015'SPEEDWAY, 250 FEET SOUTH OF THE SOUTH CURB OF THE ROAD, AND 90
 HV2015'FEET NORTHEAST OF THE NEAREST POINT OF THE SEAWALL.  A STANDARD
 HV2015'TRINAGULATION-STATION DISK, STAMPED POTOMAC PARK SOUTHEAST BASE
 HV2015'1913 1934 AND SET IN THE TOP OF A CONCRETE BLOCK PYRAMIDAL IN
 HV2015'SHAPE PROJECTING 2 FEET ABOVE GROUND.  NOTE-- LEVELING BY THE
 HV2015'NATIONAL CAPITAL PARKS SURVEY OFFICE HAS SHOWN THAT SOME OF THEM
 HV2015'HAVE SETTLED.  USE WITH CAUTION.
 HV2015
 HV2015                          STATION RECOVERY (1938)
 HV2015
 HV2015'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV2015'STATION MARK RECOVERED.  REFERENCE MARKS NOT SEARCHED FOR.
 HV2015
 HV2015                          STATION RECOVERY (1946)
 HV2015
 HV2015'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (RCB)
 HV2015'STATION RECOVERED AS DESCRIBED EXCEPT THAT THE REFERENCE MARKS
 HV2015'AND THE CURB IN WHICH THEY WERE SET HAVE SUNK ABOUT 6 INCHES
 HV2015'DUE TO CAVING IN OF THE BANK.  STATION MARK IS IN GOOD CONDITION.
 HV2015'A COMPLETE NEW DESCRIPTION FOLLOWS--STATION IS LOCATED ON THE S
 HV2015'TIP OF HAINS POINT ABOUT 250 FEET S OF THE PARKWAY AND ABOUT 90
 HV2015'FEE FROM THE SEA WALL BORDERING THE RIVER.  THE MARK IS A
 HV2015'CONCRETE BLOCK, PYRAMIDAL IN SHAPE, ABOUT 2 FEET TALL AND 2 FEET
 HV2015'ACROSS AT THE BASE.  THE MARK IS A BRONZE DISK STAMPED
 HV2015'POTOMAC PARK SOUTHEAST BASE 1913 1934.
 HV2015'
 HV2015'REFERENCE MARK 1 IS 35.275 METERS S OF THE STATION.  IT IS IN
 HV2015'A DRILL HOLE IN THE SIDEWALK CURB AND IS STAMPED POTOMAC PARK
 HV2015'SOUTHEAST BASE NO 1.
 HV2015'
 HV2015'REFERENCE MARK 2 IS 25.040 METERS W OF THE STATION.
 HV2015'IT IS IN A DRILL HOLE IN THE SIDEWALK CURB AND IS STAMPED
 HV2015'POTOMAC PARK SOUTHEAST BASE NO 2.
 HV2015
 HV2015                          STATION RECOVERY (1953)
 HV2015
 HV2015'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1953 (JHB)
 HV2015'STATION WAS RECOVERED AS DESCRIBED, PREVIOUS DESCRIPTION IS
 HV2015'ADEQUATE.
 HV2015
 HV2015                          STATION RECOVERY (1958)
 HV2015
 HV2015'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV2015'THE STATION MARK AND REFERENCE MARKS NO 1 AND NO 2 WERE RECOVRED
 HV2015'IN GOOD CONDITION.  THE 1935 DESCRIPTION BY J.H.B. IS ADEQUATE
 HV2015'AND COMPLETE.
 HV2015
 HV2015                          STATION RECOVERY (1959)
 HV2015
 HV2015'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959
 HV2015'RECOVERED IN GOOD CONDITION.
 HV2015
 HV2015                          STATION RECOVERY (1960)
 HV2015
 HV2015'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960 (CJM)
 HV2015'STATION RECOVERED AS DESCRIBED.  REFERENCE MARKS NOT SEARCHED FOR.
 HV2015
 HV2015                          STATION RECOVERY (1961)
 HV2015
 HV2015'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1961 (JLA)
 HV2015'STATION WAS RECOVERED AS DESCRIBED AND FOUND IN GOOD CONDITION.
 HV2015'REFERENCE MARKS NO. 1 AND 2 HAD BEEN DESTROYED IN THE RECONSTRUCTION
 HV2015'OF THE SEAWALL IN 1960 AND THE GENERAL AREA AROUND THE STATION
 HV2015'MARK WAS FILLED WITH TOP SOIL, TO THE EXTENT THAT THE STATION
 HV2015'MARK IS NOW FLUSH.  REFERENCE MARKS 3 AND 4 WERE SET AT THIS
 HV2015'TIME AND A COMPLETE NEW DESCRIPTION FOLLOWS.
 HV2015'
 HV2015'STATION IS LOCATED NEAR THE SOUTHERN TIP OF HAINES POINT.  IT IS
 HV2015'102 FEET EAST OF A GUARD RAIL, 93 FEET NORTH OF THE GUARD RAIL,
 HV2015'85 FEET NORTH OF A CONCRETE FOUNTAIN AND 14.9 FEET SOUTHWEST OF A
 HV2015'14 X 14 INCH CONCRETE POST WITH A 2-INCH PIPE IN THE CENTER.
 HV2015'THE MARK IS SET FLUSH AND THE DISK IS STAMPED POTOMAC PARK SE
 HV2015'BASE 1913.
 HV2015'
 HV2015'REFERENCE MARK NO. 3 IS SET IN A DRILL HOLE IN THE RETAINING WALL
 HV2015'AND IT IS 2.1 FEET NORTH OF EDGE OF THE WALL, 42 FEET WEST OF THE
 HV2015'FOUNTAIN AND 8.0 FEET SOUTH OF EDGE OF THE SIDEWALK.  THE MARK IS
 HV2015'STAMPED POTOMAC PARK SE BASE NO 3 1913-1960.
 HV2015'
 HV2015'REFERENCE MARK NO. 4 IS A PUBLIC BUILDING AND PUBLIC PARK BENCH
 HV2015'MARK DISK SET IN A DRILL HOLE IN SIDEWALK EAST OF RAIL AND
 HV2015'NORTHWEST OF STATION, 9.8 FEET EAST OF THE WALL AND 50 PACES
 HV2015'SOUTHWEST OF A 10-INCH TREE.  THE MARK IS NOT STAMPED.
 HV2015
 HV2015                          STATION RECOVERY (1965)
 HV2015
 HV2015'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1965 (DCW)
 HV2015'THE STATION AND REFERENCE MARK NO. 3 WERE RECOVERED IN GOOD
 HV2015'CONDITION AS DESCRIBED IN THE NEW DESCRIPTION BY J.L.A. 1961.
 HV2015
 HV2015                          STATION RECOVERY (1971)
 HV2015
 HV2015'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2015'THE STATION, REFERENCE MARK NO. 3 AND REFERENCE MARK NO. 4 WERE
 HV2015'ALL RECOVERED AS DESCRIBED AND FOUND TO BE IN GOOD CONDITION.  THE
 HV2015'1961 DESCRIPTION IS ADEQUATE.
 HV2015'
 HV2015'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2015'IN DIST. OF COL.
 HV2015
 HV2015                          STATION RECOVERY (1983)
 HV2015
 HV2015'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1983 (DAH)
 HV2015'REFERENCE MARKS THREE AND FOUR WERE RECOVERED IN GOOD CONDITION
 HV2015'AS DESCRIBED IN THE 1961 NOTE BY JLA.  THE STATION SURFACE MARK
 HV2015'APPEARS TO HAVE BEEN DESTROYED AS NO LARGE MASS OF CONCRETE
 HV2015'REMAINS IN THE AREA.  NO SEARCH WAS MADE FOR THE UNDERGROUND
 HV2015'MARK.
 HV2015'
 HV2015'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN POTOMAC PARK,
 HV2015'SOUTH PART OF WASHINGTON, DC.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4453 ***********************************************************************
 HV4453  DESIGNATION -  POWER 1913
 HV4453  PID         -  HV4453
 HV4453  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4453  COUNTRY     -  US
 HV4453  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4453
 HV4453                         *CURRENT SURVEY CONTROL
 HV4453  ______________________________________________________________________
 HV4453* NAD 83(1993) POSITION- 38 54 07.02934(N) 077 03 44.17745(W)   ADJUSTED
 HV4453* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV4453  ______________________________________________________________________
 HV4453  GEOID HEIGHT    -        -32.031 (meters)                     GEOID18
 HV4453  LAPLACE CORR    -         -2.64  (seconds)                    DEFLEC18
 HV4453  HORZ ORDER      -  SECOND
 HV4453
 HV4453.The horizontal coordinates were established by classical geodetic methods
 HV4453.and adjusted by the National Geodetic Survey in November 1994.
 HV4453
 HV4453.The orthometric height was scaled from a topographic map.
 HV4453
 HV4453.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4453.GEOID18 height accuracy estimate available here.
 HV4453
 HV4453.Click photographs - Photos may exist for this station.
 HV4453
 HV4453.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4453
 HV4453. The following values were computed from the NAD 83(1993) position.
 HV4453
 HV4453;                    North         East     Units Scale Factor Converg.
 HV4453;SPC MD       -   137,123.897   394,598.476   MT  0.99994995   -0 02 20.7
 HV4453;SPC MD       -   449,880.65  1,294,611.83   sFT  0.99994995   -0 02 20.7
 HV4453;SPC VA N     - 2,138,093.453 3,624,706.951   MT  0.99996068   +0 53 50.3
 HV4453;SPC VA N     - 7,014,728.27 11,892,059.39   sFT  0.99996068   +0 53 50.3
 HV4453;UTM  18      - 4,307,917.829   321,169.853   MT  0.99999381   -1 17 43.5
 HV4453
 HV4453!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4453!SPC MD       -   1.00000491  x   0.99994995  =   0.99995486
 HV4453!SPC VA N     -   1.00000491  x   0.99996068  =   0.99996559
 HV4453!UTM  18      -   1.00000491  x   0.99999381  =   0.99999872
 HV4453
 HV4453:                Primary Azimuth Mark                     Grid Az
 HV4453:SPC MD       -  WASHINGTON MONUMENT                      120 36 52.6
 HV4453:SPC VA N     -  WASHINGTON MONUMENT                      119 40 41.6
 HV4453:UTM  18      -  WASHINGTON MONUMENT                      121 52 15.4
 HV4453
 HV4453_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2116907917(NAD 83)
 HV4453
 HV4453|---------------------------------------------------------------------|
 HV4453| PID    Reference Object                     Distance      Geod. Az  |
 HV4453|                                                           dddmmss.s |
 HV4453| HV4442 WASHINGTON MONUMENT                 APPROX. 2.7 KM 1203431.9 |
 HV4453| HV4207 DAM                                 453.750 METERS 2370401.7 |
 HV4453| HV4224 BARREL                              243.863 METERS 28413     |
 HV4453| HV2164 NW 111 DCDHT                        146.914 METERS 28420     |
 HV4453|---------------------------------------------------------------------|
 HV4453
 HV4453                          SUPERSEDED SURVEY CONTROL
 HV4453
 HV4453  NAD 83(1991)-  38 54 07.02810(N)    077 03 44.17901(W) AD(       ) 2
 HV4453  NAD 83(1986)-  38 54 07.02778(N)    077 03 44.18935(W) AD(       ) 2
 HV4453  NAD 27      -  38 54 06.62520(N)    077 03 45.26700(W) AD(       ) 2
 HV4453  USSD        -  38 54 06.96500(N)    077 03 45.09800(W) AD(       ) 3
 HV4453
 HV4453.Superseded values are not recommended for survey control.
 HV4453
 HV4453.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4453.See file dsdata.pdf to determine how the superseded data were derived.
 HV4453
 HV4453_MARKER: Z = SEE DESCRIPTION
 HV4453_SETTING: 0 = UNSPECIFIED SETTING
 HV4453_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4453
 HV4453  HISTORY     - Date     Condition        Report By
 HV4453  HISTORY     - 1913     MONUMENTED       CGS
 HV4453  HISTORY     - 1924     GOOD             CGS
 HV4453  HISTORY     - 1935     GOOD             CGS
 HV4453  HISTORY     - 1938     MARK NOT FOUND   CGS
 HV4453  HISTORY     - 1960     SEE DESCRIPTION  MADHOP
 HV4453  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4453
 HV4453                          STATION DESCRIPTION
 HV4453
 HV4453'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4453'STATION IS ON THE S END OF THE HIGHEST PART OF THE ROOF OF THE
 HV4453'LARGE POWER HOUSE OF THE CAPITAL TRACTION COMPANY WHICH IS LOCATED
 HV4453'ON THE BANK OF THE POTOMAC RIVER AT THE E SIDE OF WISCONSIN AVENUE
 HV4453'IN GEORGETOWN.  THE STATION WAS NOT MARKED OTHER THAN BY
 HV4453'MEASUREMENTS TO THE PARAPET.  THIS PARAPET IS AN EXTENSION OF THE
 HV4453'S WALL OF THE BUILDING ABOVE THE ROOF AND HAS A TERRA COTTA CAP
 HV4453'TO WHICH ALL MEASUREMENTS WERE MADE.  THE STATION IS 0.25 METER
 HV4453'FROM THE CAP, 0.48 METER FROM THE W END, AND 1.08 METERS FROM
 HV4453'THE E CORNER.  THE POLE UPON WHICH OBSERVATIONS WERE MADE WAS 2
 HV4453'BY 2 INCHES SET FLUSH WITH THE FACE OF THE CAP AND 0.425 METER
 HV4453'FROM THE W CORNER AND 1.015 METERS FROM THE E CORNER.
 HV4453
 HV4453                          STATION RECOVERY (1924)
 HV4453
 HV4453'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1924 (EWE)
 HV4453'STATION LOCATED AS DESCRIBED.  THIS STATION IS DIFFICULT TO OCCUPY
 HV4453'ON ACCOUNT OF VIBRATION CAUSED BY CONVEYORS AND OTHER POWER
 HV4453'APPARATUS.  BY ARRANGING A PROPER SCHEDULE WITH THE CHIEF ENGINEER
 HV4453'A SUITABLE TIME FOR OBSERVING CAN BE HAD.
 HV4453
 HV4453                          STATION RECOVERY (1935)
 HV4453
 HV4453'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4453'THIS STATION IS NOT MARKED, BUT IS DEFINED BY MEASUREMENTS TO
 HV4453'NEARBY POINTS.  IT WAS OCCUPIED ECCENTRICALLY BY THIS PARTY.  THE
 HV4453'DESCRIPTION AS GIVEN BY O.B.F. FOLLOWS--
 HV4453'
 HV4453'THE STATION IS ON S END OF THE HIGHEST PART OF THE ROOF OF THE
 HV4453'LARGE POWER HOUSE OF THE CAPITAL TRACTION COMPANY WHICH IS LOCATED
 HV4453'ON THE BANK OF THE POTOMAC RIVER AT THE E SIDE OF WISCONSIN AVENUE
 HV4453'IN GEORGETOWN.  THE STATION WAS NOT MARKED OTHER THAN BY
 HV4453'MEASUREMENTS TO THE PARAPET.  THIS PARAPET IS AN EXTENSION TO THE
 HV4453'S WALL OF THE BUILDING ABOVE THE ROOF AND HAS A TERRA COTTA CAP
 HV4453'TO WHICH ALL MEASUREMENTS WERE MADE.  THE STATION IS 0.25 METER
 HV4453'FROM THE CAP, 0.48 METER FROM THE W END, AND 1.08 METERS FROM
 HV4453'THE E CORNER.
 HV4453
 HV4453                          STATION RECOVERY (1938)
 HV4453
 HV4453'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4453'ROOF OF BUILDING WAS NOT VISITED BUT FROM THE GROUND THERE APPEARS
 HV4453'TO HAVE BEEN NO CONSTRUCTION SINCE THE ESTABLISHMENT OF STATION
 HV4453'WHICH WOULD PREVENT RECOVERY FROM THE REFERENCE TIES GIVEN IN THE
 HV4453'DESCRIPTION.
 HV4453'
 HV4453'NOVEMBER 20, 1939, TELEPHONE REPORT BY MR. T.M.P.  THE BUILDING
 HV4453'IS THE PROPERTY OF THE CAPITAL TRACTION COMPANY AND WAS FORMERLY
 HV4453'USED AS A POWER HOUSE BUT IS NO LONGER USED.
 HV4453
 HV4453                          STATION RECOVERY (1960)
 HV4453
 HV4453'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV4453'THE STATION WAS RESET WITH A SMALL HOLE IN ROOF IN ACCORDANCE WITH
 HV4453'ORIGINAL DESCRIPTION.  THE OLD POWER HOUSE IS NOW BEING RENTED BY
 HV4453'EARLE CONTRACTORS CO.
 HV4453'
 HV4453'EXTREME CAUTION SHOULD BE EXERCISED WHEN CLIMBING OUTSIDE LADDERS
 HV4453'TO STATION.  THE LADDERS ARE IN VERY POOR CONDITION.
 HV4453
 HV4453                          STATION RECOVERY (1971)
 HV4453
 HV4453'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4453'THE STATION WAS NOT VISITED.  THE ROOF OF THE BUILDING IS LITTERED
 HV4453'WITH OPERATING EQUIPMENT AND APPARATUS OF VARIOUS CONVEYOR
 HV4453'BELTS.  THE STATION MAY BE IN POSITION AND COULD BE RECOVERED IF
 HV4453'NOT COVERED BY EQUIPMENT.
 HV4453'
 HV4453'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4453'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4420 ***********************************************************************
 HV4420  DESIGNATION -  PRESIDENTS 1935
 HV4420  PID         -  HV4420
 HV4420  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4420  COUNTRY     -  US
 HV4420  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4420
 HV4420                         *CURRENT SURVEY CONTROL
 HV4420  ______________________________________________________________________
 HV4420* NAD 83(1993) POSITION- 38 52 40.06079(N) 077 02 55.14169(W)   ADJUSTED
 HV4420* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV4420  ______________________________________________________________________
 HV4420  GEOID HEIGHT    -        -32.092 (meters)                     GEOID18
 HV4420  LAPLACE CORR    -         -2.78  (seconds)                    DEFLEC18
 HV4420  HORZ ORDER      -  THIRD
 HV4420
 HV4420.The horizontal coordinates were established by classical geodetic methods
 HV4420.and adjusted by the National Geodetic Survey in November 1994.
 HV4420
 HV4420.The orthometric height was scaled from a topographic map.
 HV4420
 HV4420.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4420.GEOID18 height accuracy estimate available here.
 HV4420
 HV4420.Click photographs - Photos may exist for this station.
 HV4420
 HV4420.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4420
 HV4420. The following values were computed from the NAD 83(1993) position.
 HV4420
 HV4420;                    North         East     Units Scale Factor Converg.
 HV4420;SPC MD       -   134,441.461   395,778.557   MT  0.99994985   -0 01 49.9
 HV4420;SPC MD       -   441,080.03  1,298,483.48   sFT  0.99994985   -0 01 49.9
 HV4420;SPC VA N     - 2,135,430.634 3,625,930.722   MT  0.99995868   +0 54 20.9
 HV4420;SPC VA N     - 7,005,992.01 11,896,074.38   sFT  0.99995868   +0 54 20.9
 HV4420;UTM  18      - 4,305,210.057   322,290.898   MT  0.99998889   -1 17 10.3
 HV4420
 HV4420!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4420!SPC MD       -   1.00000492  x   0.99994985  =   0.99995477
 HV4420!SPC VA N     -   1.00000492  x   0.99995868  =   0.99996360
 HV4420!UTM  18      -   1.00000492  x   0.99998889  =   0.99999381
 HV4420
 HV4420:                Primary Azimuth Mark                     Grid Az
 HV4420:SPC MD       -  HEURICHS BREWERY FINIAL                  346 51 29.4
 HV4420:SPC VA N     -  HEURICHS BREWERY FINIAL                  345 55 18.6
 HV4420:UTM  18      -  HEURICHS BREWERY FINIAL                  348 06 49.8
 HV4420
 HV4420_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2229005210(NAD 83)
 HV4420
 HV4420|---------------------------------------------------------------------|
 HV4420| PID    Reference Object                     Distance      Geod. Az  |
 HV4420|                                                           dddmmss.s |
 HV4420| HV4301 HEURICHS BREWERY FINIAL             APPROX. 1.9 KM 3464939.5 |
 HV4420|---------------------------------------------------------------------|
 HV4420
 HV4420                          SUPERSEDED SURVEY CONTROL
 HV4420
 HV4420  NAD 83(1991)-  38 52 40.05950(N)    077 02 55.14318(W) AD(       ) 3
 HV4420  NAD 83(1986)-  38 52 40.05914(N)    077 02 55.15392(W) AD(       ) 3
 HV4420  NAD 27      -  38 52 39.65700(N)    077 02 56.23300(W) AD(       ) 3
 HV4420
 HV4420.Superseded values are not recommended for survey control.
 HV4420
 HV4420.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4420.See file dsdata.pdf to determine how the superseded data were derived.
 HV4420
 HV4420_MARKER: DE = TRAVERSE STATION DISK
 HV4420_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV4420_STAMPING: PRESIDENTS 1935
 HV4420_MARK LOGO: CGS
 HV4420_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV4420+STABILITY: SURFACE MOTION
 HV4420
 HV4420  HISTORY     - Date     Condition        Report By
 HV4420  HISTORY     - 1935     MONUMENTED       CGS
 HV4420  HISTORY     - 1939     MARK NOT FOUND   CGS
 HV4420  HISTORY     - 1946     GOOD             CGS
 HV4420  HISTORY     - 1959     GOOD             CGS
 HV4420  HISTORY     - 20120511 MARK NOT FOUND   NGS
 HV4420
 HV4420                          STATION DESCRIPTION
 HV4420
 HV4420'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (LOC)
 HV4420'THIS TRAVERSE STATION IS A STANDARD BRONZE DISK STAMPED PRESIDENTS
 HV4420'1935 SET IN THE TOP OF A CONCRETE MONUMENT, 8 INCHES IN DIAMETER
 HV4420'AT THE TOP, 14 INCHES SQUARE AT THE BOTTOM, AND 32 INCHES DEEP
 HV4420'WITH THE MARK 3 INCHES BELOW THE GROUND LEVEL, IN THE GRASS ABOUT
 HV4420'1/8 MILE NW OF THE SE END OF COLUMBIA ISLAND, 122.3 FEET NE OF
 HV4420'THE STREET EDGE OF THE CURB ON THE NE SIDE (POTOMAC RIVER SIDE)
 HV4420'OF THE MOUNT VERNON HIGHWAY, 188.7 FEET ENE OF THE CENTER LINE
 HV4420'OF TALL IRON LAMP POST NO. 38 ON THE SW SIDE OF THE MOUNT
 HV4420'VERNON HIGHWAY, 228.5 FEET ESE OF THE CENTER LINE OF TALL IRON
 HV4420'LAMP POST NO. 37, WHICH IS THE 16TH LAMP POST ON THE NE
 HV4420'SIDE (POTOMAC RIVER SIDE) OF THE MOUNT VERNON HIGHWAY STARTING
 HV4420'WITH THE FIRST LAMP POST WHICH IS ABOUT 15 FEET FROM THE
 HV4420'ARLINGTON END OF THE ARLINGTON MEMORIAL BRIDGE, 19.6 FEET NE
 HV4420'OF THE CENTER LINE OF THE CINDER BRIDLE PATH, 12.0 FEET SW
 HV4420'OF THE EDGE OF THE BANK WHERE IT BREAKS SHARPLY OFF TO THE
 HV4420'WATER, ABOUT 12.0 FEET ABOVE AND 26.5 FEET FROM THE HIGH-WATER
 HV4420'LINE, 25.5 FEET WSW FROM THE CENTER LINE OF A DOUBLE MAPLE
 HV4420'TREE GROWING JUST ABOVE HIGH-WATER LINE, AND 35.6 FEET NNE OF
 HV4420'THE CENTER LINE OF A 2-INCH DIAMETER WILLOW TREE.  MARK IS THE
 HV4420'1/8-MILE MARK FOR THE 1 MILE SPEEDBOAT RACE COURSE WITH THE
 HV4420'START AT GATE - START.
 HV4420'
 HV4420'THE LINE MOTOR-PRESIDENTS IS 90 DEG TO THE AXIS OF THE RACE
 HV4420'COURSE.
 HV4420'
 HV4420'NOTE--DISTANCES MEASURED ON THE GROUND OR SLOPE AS THE CASE
 HV4420'MAY BE.
 HV4420
 HV4420                          STATION RECOVERY (1939)
 HV4420
 HV4420'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4420'DESCRIBED AS A TRAVERSE STATION.  IT WAS NOT VISITED, BUT IN
 HV4420'RECOVERING OTHER STATIONS IN THE VICINITY IT WAS NOTICED THAT
 HV4420'THE LAMP POST NUMBERS HAVE CHANGED ALONG THIS SECTION OF THE
 HV4420'MOUNT VERNON MEMORIAL HIGHWAY, REFERENCES TO LAMP POST NUMBERS
 HV4420'IN THE DESCRIPTION OF THIS STATION SHOULD BE DISREGARDED.
 HV4420
 HV4420                          STATION RECOVERY (1946)
 HV4420
 HV4420'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4420'STATION IS AT THE UPSTREAM LIMIT OF A WILLOW GROVE.  IT IS 119.2
 HV4420'FEET (SLOPE) FROM E CURB OF MOUNT VERNON HIGHWAY.  OTHERWISE, AS
 HV4420'DESCRIBED AND IN GOOD CONDITION.
 HV4420
 HV4420                          STATION RECOVERY (1959)
 HV4420
 HV4420'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (BFL)
 HV4420'RECOVERED AS DESCRIBED EXCEPT DELETE REFERENCE TO 2-INCH WILLOW
 HV4420'AND SUBSTITUTE (46.2 FEET NORTH OF 24 INCH TWIN WILLOW).
 HV4420
 HV4420                          STATION RECOVERY (2012)
 HV4420
 HV4420'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (JRO)
 HV4420'NOT RECOVERED, POSSIBLY DESTROYED.  THE POSITION OF THE MARK WAS
 HV4420'ESTABLISHED BY OPUS-RS AND FELL ON THE NORTH-BOUND SIDE OF THE ASPHALT
 HV4420'BIKE PATH.  THAT AREA WAS SEARCHED BY A METAL DETECTOR WHICH GOT NO
 HV4420'REACTION.  NO REFERENCES SURVIVE FROM WHICH TO LOCATE THE POSITION
 HV4420'EXCEPT THE CURB OF THE GW PARKWAY.  THAT DISTANCE WAS NOT MEASURED
 HV4420'THIS DATE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2043 ***********************************************************************
 HV2043  DESIGNATION -  Q 2
 HV2043  PID         -  HV2043
 HV2043  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2043  COUNTRY     -  US
 HV2043  USGS QUAD   -  ALEXANDRIA (2019)
 HV2043
 HV2043                         *CURRENT SURVEY CONTROL
 HV2043  ______________________________________________________________________
 HV2043* NAD 83(1986) POSITION- 38 50 24.     (N) 077 00 49.     (W)   SCALED
 HV2043* NAVD 88 ORTHO HEIGHT -     5.853 (meters)       19.20  (feet) ADJUSTED
 HV2043  ______________________________________________________________________
 HV2043  GEOID HEIGHT    -        -32.205 (meters)                     GEOID18
 HV2043  DYNAMIC HEIGHT  -          5.849 (meters)       19.19  (feet) COMP
 HV2043  MODELED GRAVITY -    980,091.3   (mgal)                       NAVD 88
 HV2043
 HV2043  VERT ORDER      -  FIRST     CLASS II
 HV2043
 HV2043.The horizontal coordinates were scaled from a map and have
 HV2043.an estimated accuracy of +/- 6 seconds.
 HV2043
 HV2043.The orthometric height was determined by differential leveling and
 HV2043.adjusted by the NATIONAL GEODETIC SURVEY
 HV2043.in June 1991.
 HV2043
 HV2043.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2043.GEOID18 height accuracy estimate available here.
 HV2043
 HV2043.Click photographs - Photos may exist for this station.
 HV2043
 HV2043.The dynamic height is computed by dividing the NAVD 88
 HV2043.geopotential number by the normal gravity value computed on the
 HV2043.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2043.degrees latitude (g = 980.6199 gals.).
 HV2043
 HV2043.The modeled gravity was interpolated from observed gravity values.
 HV2043
 HV2043
 HV2043_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ252009(NAD 83)
 HV2043
 HV2043                          SUPERSEDED SURVEY CONTROL
 HV2043
 HV2043  NGVD 29 (11/26/84)    6.113  (m)           20.06   (f) ADJUSTED    1 2
 HV2043
 HV2043.Superseded values are not recommended for survey control.
 HV2043
 HV2043.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2043.See file dsdata.pdf to determine how the superseded data were derived.
 HV2043
 HV2043_MARKER: DB = BENCH MARK DISK
 HV2043_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2043_SP_SET: STEP
 HV2043_STAMPING: Q 2 1944
 HV2043_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2043
 HV2043  HISTORY     - Date     Condition        Report By
 HV2043  HISTORY     - 1944     MONUMENTED       CGS
 HV2043
 HV2043                          STATION DESCRIPTION
 HV2043
 HV2043'DESCRIBED BY COAST AND GEODETIC SURVEY 1944
 HV2043'IN WASHINGTON.
 HV2043'IN SOUTHEAST WASHINGTON, AT BOLLING AIR FORCE BASE, AT HANGAR
 HV2043'NO. 1 AND THE CONTROL TOWER BUILDING, AT THE SOUTHWEST ENTRANCE,
 HV2043'IN THE TOP OF THE FIRST CONCRETE STEP, 30 FEET NORTH OF THE
 HV2043'SOUTHWEST CORNER OF THE BUILDING, 8 INCHES EAST OF THE WEST
 HV2043'EDGE OF THE STEP, AND 8 INCHES NORTH OF THE SOUTH EDGE.  A
 HV2043'STANDARD DISK, STAMPED Q 2 1944.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1830 ***********************************************************************
 HV1830  DESIGNATION -  Q 4 WMATA
 HV1830  PID         -  HV1830
 HV1830  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1830  COUNTRY     -  US
 HV1830  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1830
 HV1830                         *CURRENT SURVEY CONTROL
 HV1830  ______________________________________________________________________
 HV1830* NAD 83(1986) POSITION- 38 53 53.     (N) 077 01 23.     (W)   SCALED
 HV1830* NAVD 88 ORTHO HEIGHT -    10.688 (meters)       35.07  (feet) ADJUSTED
 HV1830  ______________________________________________________________________
 HV1830  GEOID HEIGHT    -        -32.087 (meters)                     GEOID18
 HV1830  DYNAMIC HEIGHT  -         10.682 (meters)       35.05  (feet) COMP
 HV1830  MODELED GRAVITY -    980,100.5   (mgal)                       NAVD 88
 HV1830
 HV1830  VERT ORDER      -  FIRST     CLASS I
 HV1830
 HV1830.The horizontal coordinates were scaled from a map and have
 HV1830.an estimated accuracy of +/- 6 seconds.
 HV1830
 HV1830.The orthometric height was determined by differential leveling and
 HV1830.adjusted by the NATIONAL GEODETIC SURVEY
 HV1830.in June 1991.
 HV1830
 HV1830.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1830.GEOID18 height accuracy estimate available here.
 HV1830
 HV1830.Click photographs - Photos may exist for this station.
 HV1830
 HV1830.The dynamic height is computed by dividing the NAVD 88
 HV1830.geopotential number by the normal gravity value computed on the
 HV1830.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1830.degrees latitude (g = 980.6199 gals.).
 HV1830
 HV1830.The modeled gravity was interpolated from observed gravity values.
 HV1830
 HV1830
 HV1830_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ245074(NAD 83)
 HV1830
 HV1830                          SUPERSEDED SURVEY CONTROL
 HV1830
 HV1830  NGVD 29 (11/26/84)   10.920  (m)           35.83   (f) ADJUSTED    1 1
 HV1830
 HV1830.Superseded values are not recommended for survey control.
 HV1830
 HV1830.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1830.See file dsdata.pdf to determine how the superseded data were derived.
 HV1830
 HV1830_MARKER: Z = SEE DESCRIPTION
 HV1830_SETTING: 66 = SET IN ROCK OUTCROP
 HV1830_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 HV1830+STABILITY: POSITION/ELEVATION WELL
 HV1830
 HV1830  HISTORY     - Date     Condition        Report By
 HV1830  HISTORY     - UNK      MONUMENTED       WMATA
 HV1830  HISTORY     - 1974     GOOD             NGS
 HV1830
 HV1830                          STATION DESCRIPTION
 HV1830
 HV1830'DESCRIBED BY NATIONAL GEODETIC SURVEY 1974
 HV1830'IN WASHINGTON.
 HV1830'THE MARK IS IN THE BASEMENT OF THE NATIONAL COLLECTION OF
 HV1830'FINE ARTS BUILDING ON G STREET NW BETWEEN 7TH AND 9TH STREETS.
 HV1830'THERE IS A DRIVEWAY TO THE BASEMENT ENTRANCE FROM BOTH 7TH AND
 HV1830'9TH STREETS.  THE BASEMENT DOOR IS ABOUT 80 METERS EAST FROM
 HV1830'THE EAST CURB OF 9TH STREET THROUGH A ROLL-UP TYPE GATE AND
 HV1830'THE MARK IS ABOUT 10 METERS INSIDE THE BUILDING FROM THE
 HV1830'BASEMENT DOOR.  THE MARK CONSISTS OF A 3 1/2 INCH DIAMETER OUTER
 HV1830'PIPE SET ON THE BEDROCK AND A 2 IN. DIAMETER INNER PIPE TEN
 HV1830'FEET IN THE BEDROCK.  A 2 IN. DIAMETER STAINLESS STEEL BALL IS
 HV1830'WELDED TO THE TOP OF THE INNER PIPE.  A LARGE DIAMETER STEEL
 HV1830'CASING WITH A BRASS COVER PROTECTS THE TOP OF THE MARK.  A LARGE
 HV1830'SCREWDRIVER IS NEEDED FOR OPENING THE COVER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1224 ***********************************************************************
 HV1224  DESIGNATION -  Q DC
 HV1224  PID         -  HV1224
 HV1224  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1224  COUNTRY     -  US
 HV1224  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1224
 HV1224                         *CURRENT SURVEY CONTROL
 HV1224  ______________________________________________________________________
 HV1224* NAD 83(1986) POSITION- 38 53 55.     (N) 076 59 34.     (W)   SCALED
 HV1224* NAVD 88 ORTHO HEIGHT -    13.885 (meters)       45.55  (feet) ADJUSTED
 HV1224  ______________________________________________________________________
 HV1224  GEOID HEIGHT    -        -32.140 (meters)                     GEOID18
 HV1224  DYNAMIC HEIGHT  -         13.878 (meters)       45.53  (feet) COMP
 HV1224  MODELED GRAVITY -    980,103.1   (mgal)                       NAVD 88
 HV1224
 HV1224  VERT ORDER      -  FIRST     CLASS II
 HV1224
 HV1224.The horizontal coordinates were scaled from a map and have
 HV1224.an estimated accuracy of +/- 6 seconds.
 HV1224
 HV1224.The orthometric height was determined by differential leveling and
 HV1224.adjusted by the NATIONAL GEODETIC SURVEY
 HV1224.in June 1991.
 HV1224
 HV1224.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1224.GEOID18 height accuracy estimate available here.
 HV1224
 HV1224.Click photographs - Photos may exist for this station.
 HV1224
 HV1224.The dynamic height is computed by dividing the NAVD 88
 HV1224.geopotential number by the normal gravity value computed on the
 HV1224.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1224.degrees latitude (g = 980.6199 gals.).
 HV1224
 HV1224.The modeled gravity was interpolated from observed gravity values.
 HV1224
 HV1224
 HV1224_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ271074(NAD 83)
 HV1224
 HV1224                          SUPERSEDED SURVEY CONTROL
 HV1224
 HV1224  NGVD 29 (11/26/84)   14.134  (m)           46.37   (f) ADJUSTED    1 2
 HV1224
 HV1224.Superseded values are not recommended for survey control.
 HV1224
 HV1224.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1224.See file dsdata.pdf to determine how the superseded data were derived.
 HV1224
 HV1224_MARKER: DB = BENCH MARK DISK
 HV1224_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1224_SP_SET: SCHOOL BUILDING
 HV1224_STAMPING: Q 1917
 HV1224_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1224_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1224+SATELLITE: SATELLITE OBSERVATIONS - July 13, 2003
 HV1224
 HV1224  HISTORY     - Date     Condition        Report By
 HV1224  HISTORY     - 1917     MONUMENTED       CGS
 HV1224  HISTORY     - 1929     GOOD             CGS
 HV1224  HISTORY     - 1941     GOOD             CGS
 HV1224  HISTORY     - 20030713 GOOD             GEOCAC
 HV1224
 HV1224                          STATION DESCRIPTION
 HV1224
 HV1224'DESCRIBED BY COAST AND GEODETIC SURVEY 1929
 HV1224'AT WASHINGTON.
 HV1224'AT WASHINGTON, AT THE SOUTHEAST CORNER OF THE INTERSECTION OF
 HV1224'TENTH AND G STREETS NORTHEAST, AT THE MADISON SCHOOL, IN THE
 HV1224'WEST WALL, 7.5 FEET SOUTH OF THE CENTER OF THE ENTRANCE, AND
 HV1224'3.5 FEET ABOVE THE SIDEWALK.  A STANDARD DISK, STAMPED Q 1917
 HV1224'AND SET VERTICALLY.
 HV1224
 HV1224                          STATION RECOVERY (1941)
 HV1224
 HV1224'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1941
 HV1224'RECOVERED IN GOOD CONDITION.
 HV1224
 HV1224                          STATION RECOVERY (2003)
 HV1224
 HV1224'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV1224'BUILDING IS NO LONGER A SCHOOL. STATION DISK IS LOCATED TO RIGHT OF
 HV1224'ENTRANCE, BEHIND GAS PIPES. DISK IS PAINTED BUT STAMPING IS LEGIBLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4717 ***********************************************************************
 HV4717  DESIGNATION -  Q USE 1913
 HV4717  PID         -  HV4717
 HV4717  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4717  COUNTRY     -  US
 HV4717  USGS QUAD   -  ALEXANDRIA (2019)
 HV4717
 HV4717                         *CURRENT SURVEY CONTROL
 HV4717  ______________________________________________________________________
 HV4717* NAD 83(1993) POSITION- 38 51 25.11433(N) 077 01 21.51749(W)   ADJUSTED
 HV4717* NAVD 88 ORTHO HEIGHT -     2.    (meters)        7.    (feet) SCALED
 HV4717  ______________________________________________________________________
 HV4717  GEOID HEIGHT    -        -32.166 (meters)                     GEOID18
 HV4717  LAPLACE CORR    -         -2.92  (seconds)                    DEFLEC18
 HV4717  HORZ ORDER      -  THIRD
 HV4717
 HV4717.The horizontal coordinates were established by classical geodetic methods
 HV4717.and adjusted by the National Geodetic Survey in November 1994.
 HV4717
 HV4717.The orthometric height was scaled from a topographic map.
 HV4717
 HV4717.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4717.GEOID18 height accuracy estimate available here.
 HV4717
 HV4717.Click photographs - Photos may exist for this station.
 HV4717
 HV4717.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4717
 HV4717. The following values were computed from the NAD 83(1993) position.
 HV4717
 HV4717;                    North         East     Units Scale Factor Converg.
 HV4717;SPC MD       -   132,129.577   398,034.609   MT  0.99994990   -0 00 51.2
 HV4717;SPC MD       -   433,495.12  1,305,885.21   sFT  0.99994990   -0 00 51.2
 HV4717;SPC VA N     - 2,133,155.906 3,628,224.270   MT  0.99995710   +0 55 19.4
 HV4717;SPC VA N     - 6,998,529.00 11,903,599.13   sFT  0.99995710   +0 55 19.4
 HV4717;UTM  18      - 4,302,849.221   324,495.835   MT  0.99997930   -1 16 09.4
 HV4717
 HV4717!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4717!SPC MD       -   1.00000477  x   0.99994990  =   0.99995467
 HV4717!SPC VA N     -   1.00000477  x   0.99995710  =   0.99996187
 HV4717!UTM  18      -   1.00000477  x   0.99997930  =   0.99998407
 HV4717
 HV4717:                Primary Azimuth Mark                     Grid Az
 HV4717:SPC MD       -  O                                        092 08 12.3
 HV4717:SPC VA N     -  O                                        091 12 01.7
 HV4717:UTM  18      -  O                                        093 23 30.5
 HV4717
 HV4717_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2449502849(NAD 83)
 HV4717
 HV4717|---------------------------------------------------------------------|
 HV4717| PID    Reference Object                     Distance      Geod. Az  |
 HV4717|                                                           dddmmss.s |
 HV4717| HV4667 O                                   APPROX. 0.6 KM 0920721.1 |
 HV4717| HV4710 RED STANDPIPE                       APPROX. 1.3 KM 1664839.5 |
 HV4717| HV4708 TOWER                               APPROX. 1.5 KM 1752803.1 |
 HV4717| HV4589 IRON CAP STACK                      APPROX. 1.9 KM 2323027.4 |
 HV4717| HV4593 LARGE IRON STACK POWERHOUSE         APPROX. 3.0 KM 2432500.6 |
 HV4717| HV4610 SIGNAL TOWER                        APPROX. 2.2 KM 3075156.7 |
 HV4717|---------------------------------------------------------------------|
 HV4717
 HV4717                          SUPERSEDED SURVEY CONTROL
 HV4717
 HV4717  NAD 83(1991)-  38 51 25.11286(N)    077 01 21.51881(W) AD(       ) 3
 HV4717  NAD 83(1986)-  38 51 25.11258(N)    077 01 21.52988(W) AD(       ) 3
 HV4717  NAD 27      -  38 51 24.71100(N)    077 01 22.60900(W) AD(       ) 3
 HV4717  USSD        -  38 51 25.04900(N)    077 01 22.43900(W) AD(       ) 3
 HV4717
 HV4717.Superseded values are not recommended for survey control.
 HV4717
 HV4717.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4717.See file dsdata.pdf to determine how the superseded data were derived.
 HV4717
 HV4717_MARKER: H = DRILL HOLE
 HV4717_SETTING: 0 = UNSPECIFIED SETTING
 HV4717_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4717
 HV4717  HISTORY     - Date     Condition        Report By
 HV4717  HISTORY     - 1913     MONUMENTED       USACE
 HV4717  HISTORY     - 1919     GOOD             CGS
 HV4717  HISTORY     - 1940     MARK NOT FOUND   CGS
 HV4717
 HV4717                          STATION DESCRIPTION
 HV4717
 HV4717'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1913 (OBF)
 HV4717'STATION IS A DRILL HOLE IN SEA WALL ON RIVER SIDE DISTANT 33
 HV4717'METERS FROM SOUTHEAST BASE.
 HV4717
 HV4717                          STATION RECOVERY (1919)
 HV4717
 HV4717'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1919 (PBT)
 HV4717'STATION IS MARKED BY A 3/4-INCH DRILL HOLE.  A 1-1/8 INCH DRILL HOLE
 HV4717'CONTAINING METAL BOLT WAS FOUND ON THE SEA WALL ABOUT 1 METER N OF
 HV4717'STATION Q.
 HV4717
 HV4717                          STATION RECOVERY (1940)
 HV4717
 HV4717'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV4717'STATION LOST.  NEITHER THE STATION MARK NOR ANY OF THE MARKINGS
 HV4717'FOUND IN 1919 ARE NOW TO BE SEEN.  THE SEA WALL HAS BEEN
 HV4717'COVERED OVER WITH A THICK CONCRETE SIDEWALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1223 ***********************************************************************
 HV1223  DESIGNATION -  R
 HV1223  PID         -  HV1223
 HV1223  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1223  COUNTRY     -  US
 HV1223  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1223
 HV1223                         *CURRENT SURVEY CONTROL
 HV1223  ______________________________________________________________________
 HV1223* NAD 83(1986) POSITION- 38 53 40.     (N) 076 59 37.     (W)   SCALED
 HV1223* NAVD 88 ORTHO HEIGHT -    26.973 (meters)       88.49  (feet) ADJUSTED
 HV1223  ______________________________________________________________________
 HV1223  GEOID HEIGHT    -        -32.147 (meters)                     GEOID18
 HV1223  DYNAMIC HEIGHT  -         26.958 (meters)       88.44  (feet) COMP
 HV1223  MODELED GRAVITY -    980,102.0   (mgal)                       NAVD 88
 HV1223
 HV1223  VERT ORDER      -  FIRST     CLASS II
 HV1223
 HV1223.The horizontal coordinates were scaled from a map and have
 HV1223.an estimated accuracy of +/- 6 seconds.
 HV1223
 HV1223.The orthometric height was determined by differential leveling and
 HV1223.adjusted by the NATIONAL GEODETIC SURVEY
 HV1223.in June 1991.
 HV1223
 HV1223.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1223.GEOID18 height accuracy estimate available here.
 HV1223
 HV1223.Click photographs - Photos may exist for this station.
 HV1223
 HV1223.The dynamic height is computed by dividing the NAVD 88
 HV1223.geopotential number by the normal gravity value computed on the
 HV1223.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1223.degrees latitude (g = 980.6199 gals.).
 HV1223
 HV1223.The modeled gravity was interpolated from observed gravity values.
 HV1223
 HV1223
 HV1223_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ271069(NAD 83)
 HV1223
 HV1223                          SUPERSEDED SURVEY CONTROL
 HV1223
 HV1223  NGVD 29 (11/26/84)   27.220  (m)           89.30   (f) ADJUSTED    1 2
 HV1223
 HV1223.Superseded values are not recommended for survey control.
 HV1223
 HV1223.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1223.See file dsdata.pdf to determine how the superseded data were derived.
 HV1223
 HV1223_MARKER: DB = BENCH MARK DISK
 HV1223_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1223_SP_SET: SCHOOL BUILDING
 HV1223_STAMPING: R 1917
 HV1223_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1223
 HV1223  HISTORY     - Date     Condition        Report By
 HV1223  HISTORY     - 1917     MONUMENTED       CGS
 HV1223  HISTORY     - 1929     GOOD             CGS
 HV1223  HISTORY     - 1942     GOOD             CGS
 HV1223  HISTORY     - 20050424 GOOD             GEOCAC
 HV1223
 HV1223                          STATION DESCRIPTION
 HV1223
 HV1223'DESCRIBED BY COAST AND GEODETIC SURVEY 1929
 HV1223'AT WASHINGTON.
 HV1223'AT WASHINGTON, AT THE SOUTHEAST CORNER OF THE INTERSECTION OF
 HV1223'NINTH AND D STREETS NORTHEAST, 76 FEET SOUTH OF THE SOUTH CURBING
 HV1223'OF D STREET, 34.8 FEET EAST OF THE EAST CURBING OF NINTH STREET,
 HV1223'AT THE EDMUNDS SCHOOL, IN THE WEST BRICK WALL, 4.5 FEET NORTH
 HV1223'OF THE NORTH EDGE OF THE WEST ENTRANCE, AND 1.7 FEET ABOVE THE
 HV1223'SIDEWALK.  A STANDARD DISK, STAMPED R 1917 AND SET VERTICALLY.
 HV1223
 HV1223                          STATION RECOVERY (1942)
 HV1223
 HV1223'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1942
 HV1223'RECOVERED IN GOOD CONDITION.
 HV1223
 HV1223                          STATION RECOVERY (2005)
 HV1223
 HV1223'RECOVERY NOTE BY GEOCACHING 2005 (APC)
 HV1223'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1831 ***********************************************************************
 HV1831  DESIGNATION -  R 4 WMATA
 HV1831  PID         -  HV1831
 HV1831  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1831  COUNTRY     -  US
 HV1831  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1831
 HV1831                         *CURRENT SURVEY CONTROL
 HV1831  ______________________________________________________________________
 HV1831* NAD 83(1986) POSITION- 38 53 52.     (N) 077 02 01.     (W)   SCALED
 HV1831* NAVD 88 ORTHO HEIGHT -    13.294 (meters)       43.62  (feet) ADJUSTED
 HV1831  ______________________________________________________________________
 HV1831  GEOID HEIGHT    -        -32.073 (meters)                     GEOID18
 HV1831  DYNAMIC HEIGHT  -         13.286 (meters)       43.59  (feet) COMP
 HV1831  MODELED GRAVITY -    980,098.4   (mgal)                       NAVD 88
 HV1831
 HV1831  VERT ORDER      -  FIRST     CLASS 0
 HV1831
 HV1831.The horizontal coordinates were scaled from a map and have
 HV1831.an estimated accuracy of +/- 6 seconds.
 HV1831
 HV1831.The orthometric height was determined by differential leveling and
 HV1831.adjusted by the NATIONAL GEODETIC SURVEY
 HV1831.in June 1991.
 HV1831
 HV1831.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1831.GEOID18 height accuracy estimate available here.
 HV1831
 HV1831.Click photographs - Photos may exist for this station.
 HV1831
 HV1831.The dynamic height is computed by dividing the NAVD 88
 HV1831.geopotential number by the normal gravity value computed on the
 HV1831.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1831.degrees latitude (g = 980.6199 gals.).
 HV1831
 HV1831.The modeled gravity was interpolated from observed gravity values.
 HV1831
 HV1831
 HV1831_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ236073(NAD 83)
 HV1831
 HV1831                          SUPERSEDED SURVEY CONTROL
 HV1831
 HV1831  NGVD 29 (08/12/92)   13.525  (m)           44.37   (f) ADJUSTED    1 0
 HV1831  NGVD 29 (??/??/87)   13.525  (m)           44.37   (f) SUPERSEDED  1 0
 HV1831
 HV1831.Superseded values are not recommended for survey control.
 HV1831
 HV1831.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1831.See file dsdata.pdf to determine how the superseded data were derived.
 HV1831
 HV1831_MARKER: Z = SEE DESCRIPTION
 HV1831_SETTING: 66 = SET IN ROCK OUTCROP
 HV1831_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 HV1831+STABILITY: POSITION/ELEVATION WELL
 HV1831
 HV1831  HISTORY     - Date     Condition        Report By
 HV1831  HISTORY     - UNK      MONUMENTED       WMATA
 HV1831  HISTORY     - 1974     GOOD             NGS
 HV1831  HISTORY     - 1978     GOOD             NGS
 HV1831  HISTORY     - 1978     GOOD             NGS
 HV1831  HISTORY     - 1979     GOOD             NGS
 HV1831  HISTORY     - 1984     GOOD             NGS
 HV1831
 HV1831                          STATION DESCRIPTION
 HV1831
 HV1831'DESCRIBED BY NATIONAL GEODETIC SURVEY 1974
 HV1831'IN WASHINGTON.
 HV1831'AT THE INTERSECTION OF 15TH AND G STS., N.W. IN THE WEST SIDEWALK
 HV1831'OF 15TH ST. AT THE FRONT OF THE U.S. TREASURY BUILDING, 8
 HV1831'METERS SOUTH FROM THE NE CORNER OF THE BLDG., 3 METERS WEST
 HV1831'FROM THE WEST CURB OF 15TH STREET.  THE MARK CONSISTS OF A
 HV1831'3 1/2 IN. DIA. OUTER PIPE SET ON THE BEDROCK AND A 2 IN. DIA.
 HV1831'INNER PIPE CEMENTED INTO THE BEDROCK.  A 2 1/8 IN. DIA.
 HV1831'STAINLESS STEEL BALL IS WELDED TO THE TOP OF THE INNER PIPE.
 HV1831'A ROUND CAST IRON BOX WITH A COVER SET FLUSH WITH THE SIDEWALK
 HV1831'PROTECTS THE BM.
 HV1831
 HV1831                          STATION RECOVERY (1978)
 HV1831
 HV1831'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV1831'RECOVERED IN GOOD CONDITION.
 HV1831
 HV1831                          STATION RECOVERY (1978)
 HV1831
 HV1831'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV1831'RECOVERED IN GOOD CONDITION.
 HV1831
 HV1831                          STATION RECOVERY (1979)
 HV1831
 HV1831'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1831'RECOVERED IN GOOD CONDITION.
 HV1831
 HV1831                          STATION RECOVERY (1984)
 HV1831
 HV1831'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984
 HV1831'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4687 ***********************************************************************
 HV4687  DESIGNATION -  RACE COURSE AIR BCN PYRAMID
 HV4687  PID         -  HV4687
 HV4687  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4687  COUNTRY     -  US
 HV4687  USGS QUAD   -  ALEXANDRIA (2019)
 HV4687
 HV4687                         *CURRENT SURVEY CONTROL
 HV4687  ______________________________________________________________________
 HV4687* NAD 83(1993) POSITION- 38 48 06.98926(N) 077 01 38.90058(W)   ADJUSTED
 HV4687  ______________________________________________________________________
 HV4687  GEOID HEIGHT    -        -32.254 (meters)                     GEOID18
 HV4687  LAPLACE CORR    -         -3.17  (seconds)                    DEFLEC18
 HV4687  HORZ ORDER      -  THIRD
 HV4687
 HV4687.The horizontal coordinates were established by classical geodetic methods
 HV4687.and adjusted by the National Geodetic Survey in November 1994.
 HV4687
 HV4687.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4687.GEOID18 height accuracy estimate available here.
 HV4687
 HV4687.Click photographs - Photos may exist for this station.
 HV4687
 HV4687.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4687
 HV4687. The following values were computed from the NAD 83(1993) position.
 HV4687
 HV4687;                    North         East     Units Scale Factor Converg.
 HV4687;SPC MD       -   126,020.467   397,613.664   MT  0.99995067   -0 01 02.1
 HV4687;SPC MD       -   413,452.15  1,304,504.16   sFT  0.99995067   -0 01 02.1
 HV4687;SPC VA N     - 2,127,040.703 3,627,903.203   MT  0.99995355   +0 55 08.5
 HV4687;SPC VA N     - 6,978,466.04 11,902,545.76   sFT  0.99995355   +0 55 08.5
 HV4687;UTM  18      - 4,296,750.605   323,941.243   MT  0.99998171   -1 16 14.9
 HV4687
 HV4687_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2394196750(NAD 83)
 HV4687
 HV4687                          SUPERSEDED SURVEY CONTROL
 HV4687
 HV4687  NAD 83(1991)-  38 48 06.98757(N)    077 01 38.90205(W) AD(       ) 3
 HV4687  NAD 83(1986)-  38 48 06.98757(N)    077 01 38.91406(W) AD(       ) 3
 HV4687  NAD 27      -  38 48 06.57400(N)    077 01 39.99500(W) AD(       ) 3
 HV4687
 HV4687.Superseded values are not recommended for survey control.
 HV4687
 HV4687.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4687.See file dsdata.pdf to determine how the superseded data were derived.
 HV4687
 HV4687
 HV4687  HISTORY     - Date     Condition        Report By
 HV4687  HISTORY     - 1929     FIRST OBSERVED   CGS
 HV4687  HISTORY     - 1974     MARK NOT FOUND   NGS
 HV4687
 HV4687                          STATION DESCRIPTION
 HV4687
 HV4687'DESCRIBED BY NATIONAL GEODETIC SURVEY 1974 (GWJ)
 HV4687'STATION SEARCHED FOR AND NOT FOUND.  STATION IS BELIEVED TO BE LOST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7668 ***********************************************************************
 HV7668  DESIGNATION -  RACE USE 1931
 HV7668  PID         -  HV7668
 HV7668  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7668  COUNTRY     -  US
 HV7668  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7668
 HV7668                         *CURRENT SURVEY CONTROL
 HV7668  ______________________________________________________________________
 HV7668* NAD 83(1993) POSITION- 38 54 11.45330(N) 076 56 59.28201(W)   ADJUSTED
 HV7668* NAVD 88 ORTHO HEIGHT -     6.3   (meters)       21.    (feet) VERTCON3
 HV7668  ______________________________________________________________________
 HV7668  GEOID HEIGHT    -        -32.222 (meters)                     GEOID18
 HV7668  LAPLACE CORR    -         -4.12  (seconds)                    DEFLEC18
 HV7668  HORZ ORDER      -  THIRD
 HV7668
 HV7668.The horizontal coordinates were established by classical geodetic methods
 HV7668.and adjusted by the National Geodetic Survey in November 1994.
 HV7668
 HV7668.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV7668.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV7668
 HV7668.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7668.GEOID18 height accuracy estimate available here.
 HV7668
 HV7668.Click photographs - Photos may exist for this station.
 HV7668
 HV7668.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7668
 HV7668. The following values were computed from the NAD 83(1993) position.
 HV7668
 HV7668;                    North         East     Units Scale Factor Converg.
 HV7668;SPC MD       -   137,259.668   404,354.299   MT  0.99994996   +0 01 53.4
 HV7668;SPC MD       -   450,326.09  1,326,619.06   sFT  0.99994996   +0 01 53.4
 HV7668;SPC VA N     - 2,138,388.609 3,634,459.358   MT  0.99996078   +0 58 03.0
 HV7668;SPC VA N     - 7,015,696.63 11,924,055.41   sFT  0.99996078   +0 58 03.0
 HV7668;UTM  18      - 4,307,839.667   330,926.529   MT  0.99995201   -1 13 29.2
 HV7668
 HV7668!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7668!SPC MD       -   1.00000407  x   0.99994996  =   0.99995403
 HV7668!SPC VA N     -   1.00000407  x   0.99996078  =   0.99996485
 HV7668!UTM  18      -   1.00000407  x   0.99995201  =   0.99995608
 HV7668
 HV7668:                Primary Azimuth Mark                     Grid Az
 HV7668:SPC MD       -  COAL USE 1931                            250 01 05.7
 HV7668:SPC VA N     -  COAL USE 1931                            249 04 56.1
 HV7668:UTM  18      -  COAL USE 1931                            251 16 28.3
 HV7668
 HV7668_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3092607839(NAD 83)
 HV7668
 HV7668|---------------------------------------------------------------------|
 HV7668| PID    Reference Object                     Distance      Geod. Az  |
 HV7668|                                                           dddmmss.s |
 HV7668| HV7706 COAL USE 1931                       APPROX. 0.9 KM 2500259.1 |
 HV7668|---------------------------------------------------------------------|
 HV7668
 HV7668                          SUPERSEDED SURVEY CONTROL
 HV7668
 HV7668  NAD 83(1991)-  38 54 11.45204(N)    076 56 59.28307(W) AD(       ) 3
 HV7668  NAD 83(1986)-  38 54 11.45112(N)    076 56 59.29416(W) AD(       ) 3
 HV7668  NAD 27      -  38 54 11.04500(N)    076 57 00.39600(W) AD(       ) 3
 HV7668  NGVD 29 (07/19/86)    6.5    (m)           21.     (f) VERT ANG       
 HV7668
 HV7668.Superseded values are not recommended for survey control.
 HV7668
 HV7668.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7668.See file dsdata.pdf to determine how the superseded data were derived.
 HV7668
 HV7668
 HV7668  HISTORY     - Date     Condition        Report By
 HV7668  HISTORY     - 1931     MONUMENTED       CGS
 HV7668  HISTORY     - 1958     MARK NOT FOUND   CGS
 HV7668
 HV7668                          STATION DESCRIPTION
 HV7668
 HV7668'DESCRIBED BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7668'DUE TO THE LACK OF A DESCRIPTION, THIS STATION IS NOT RECOVERABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4397 ***********************************************************************
 HV4397  DESIGNATION -  RANGE 1943
 HV4397  PID         -  HV4397
 HV4397  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4397  COUNTRY     -  US
 HV4397  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4397
 HV4397                         *CURRENT SURVEY CONTROL
 HV4397  ______________________________________________________________________
 HV4397* NAD 83(1993) POSITION- 38 56 30.11595(N) 077 03 55.44607(W)   ADJUSTED
 HV4397* NAVD 88 ORTHO HEIGHT -   105.    (meters)      344.    (feet) SCALED
 HV4397  ______________________________________________________________________
 HV4397  GEOID HEIGHT    -        -31.964 (meters)                     GEOID18
 HV4397  LAPLACE CORR    -         -3.11  (seconds)                    DEFLEC18
 HV4397  HORZ ORDER      -  SECOND
 HV4397
 HV4397.The horizontal coordinates were established by classical geodetic methods
 HV4397.and adjusted by the National Geodetic Survey in November 1994.
 HV4397
 HV4397.The orthometric height was scaled from a topographic map.
 HV4397
 HV4397.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4397.GEOID18 height accuracy estimate available here.
 HV4397
 HV4397.Click photographs - Photos may exist for this station.
 HV4397
 HV4397.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4397
 HV4397. The following values were computed from the NAD 83(1993) position.
 HV4397
 HV4397;                    North         East     Units Scale Factor Converg.
 HV4397;SPC MD       -   141,536.259   394,330.122   MT  0.99995051   -0 02 27.8
 HV4397;SPC MD       -   464,356.88  1,293,731.41   sFT  0.99995051   -0 02 27.8
 HV4397;SPC VA N     - 2,142,500.895 3,624,366.519   MT  0.99996435   +0 53 43.3
 HV4397;SPC VA N     - 7,029,188.35 11,890,942.49   sFT  0.99996435   +0 53 43.3
 HV4397;UTM  18      - 4,312,335.210   320,998.342   MT  0.99999456   -1 17 54.6
 HV4397
 HV4397!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4397!SPC MD       -   0.99998858  x   0.99995051  =   0.99993909
 HV4397!SPC VA N     -   0.99998858  x   0.99996435  =   0.99995293
 HV4397!UTM  18      -   0.99998858  x   0.99999456  =   0.99998314
 HV4397
 HV4397:                Primary Azimuth Mark                     Grid Az
 HV4397:SPC MD       -  UNITY                                    124 30 26.0
 HV4397:SPC VA N     -  UNITY                                    123 34 14.9
 HV4397:UTM  18      -  UNITY                                    125 45 52.8
 HV4397
 HV4397_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2099812335(NAD 83)
 HV4397
 HV4397|---------------------------------------------------------------------|
 HV4397| PID    Reference Object                     Distance      Geod. Az  |
 HV4397|                                                           dddmmss.s |
 HV4397| HV4439 UNITY                               APPROX. 3.1 KM 1242758.2 |
 HV4397| HV4314 BROAD                               APPROX. 0.7 KM 1284147.2 |
 HV4397| HV4399 SEDGWICK                            443.969 METERS 1300230.8 |
 HV4397| HV4325 KLINGLE                             APPROX. 1.2 KM 1401940.5 |
 HV4397| HV4316 ORDWAY                              APPROX. 0.9 KM 1403645.4 |
 HV4397| HV4404 SWANK                               APPROX. 1.4 KM 1421029.0 |
 HV4397| HV4405 WARDMAN                             APPROX. 2.1 KM 1544751.9 |
 HV4397|---------------------------------------------------------------------|
 HV4397
 HV4397                          SUPERSEDED SURVEY CONTROL
 HV4397
 HV4397  NAD 83(1991)-  38 56 30.11527(N)    077 03 55.44727(W) AD(       ) 2
 HV4397  NAD 83(1986)-  38 56 30.11486(N)    077 03 55.45743(W) AD(       ) 2
 HV4397  NAD 27      -  38 56 29.71600(N)    077 03 56.53400(W) AD(       ) 2
 HV4397
 HV4397.Superseded values are not recommended for survey control.
 HV4397
 HV4397.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4397.See file dsdata.pdf to determine how the superseded data were derived.
 HV4397
 HV4397_MARKER: I = METAL ROD
 HV4397_SETTING: 0 = UNSPECIFIED SETTING
 HV4397_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4397
 HV4397  HISTORY     - Date     Condition        Report By
 HV4397  HISTORY     - 1943     MONUMENTED       CGS
 HV4397
 HV4397                          STATION DESCRIPTION
 HV4397
 HV4397'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4397'THE STATION IS ON THE FLAT ROOF OF THE EAST BUILDING ON THE
 HV4397'GROUNDS OF THE BUREAU OF STANDARDS, 2.71 METERS FROM WEST
 HV4397'PARAPET, 4.71 METERS FROM EAST PARAPET, 11.88 METERS FROM
 HV4397'PARAPET-S.W. CORNER, 12.50 METERS FROM PARAPET-S.E. CORNER,
 HV4397'7.85 METERS FROM CENTER OF ANTENNAE POLE ON SOUTH END OF
 HV4397'BUILDING, AND 55.247 METERS FROM TRIANGULATION STATION STANDARDS
 HV4397'2 ON N.E. CORNER OF ROOF OF SOUTH BUILDING.  MEASUREMENTS TO
 HV4397'PARAPET WERE TO CENTER OF TOP OF ROUNDED TILE COPING.
 HV4397'
 HV4397'THE STATION IS MARKED BY A CROSS IN TOP END OF A BRASS ROD
 HV4397'APPROXIMATELY 5/16 INCH IN DIAMETER AND 4 INCHES LONG LET
 HV4397'INTO A DRILL HOLE IN THE BRICK OF THE ROOF AND SET WITH NEAT
 HV4397'PORTLAND CEMENT AND FINISHED WITH ASPHALT.  TOP OF ROD PROJECTS
 HV4397'APPROXIMATELY 1/8 INCH ABOVE ROOF SURFACE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4367 ***********************************************************************
 HV4367  DESIGNATION -  RAP
 HV4367  PID         -  HV4367
 HV4367  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4367  COUNTRY     -  US
 HV4367  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4367
 HV4367                         *CURRENT SURVEY CONTROL
 HV4367  ______________________________________________________________________
 HV4367* NAD 83(1993) POSITION- 38 56 04.14684(N) 077 07 08.00834(W)   ADJUSTED
 HV4367* NAVD 88 ORTHO HEIGHT -     6.    (meters)       20.    (feet) SCALED
 HV4367  ______________________________________________________________________
 HV4367  GEOID HEIGHT    -        -31.911 (meters)                     GEOID18
 HV4367  LAPLACE CORR    -         -2.15  (seconds)                    DEFLEC18
 HV4367  HORZ ORDER      -  SECOND
 HV4367
 HV4367.The horizontal coordinates were established by classical geodetic methods
 HV4367.and adjusted by the National Geodetic Survey in November 1994.
 HV4367
 HV4367.The orthometric height was scaled from a topographic map.
 HV4367
 HV4367.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4367.GEOID18 height accuracy estimate available here.
 HV4367
 HV4367.Click photographs - Photos may exist for this station.
 HV4367
 HV4367.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4367
 HV4367. The following values were computed from the NAD 83(1993) position.
 HV4367
 HV4367;                    North         East     Units Scale Factor Converg.
 HV4367;SPC MD       -   140,740.163   389,691.906   MT  0.99995037   -0 04 28.6
 HV4367;SPC MD       -   461,745.02  1,278,514.19   sFT  0.99995037   -0 04 28.6
 HV4367;SPC VA N     - 2,141,629.085 3,619,741.872   MT  0.99996365   +0 51 43.1
 HV4367;SPC VA N     - 7,026,328.09 11,875,769.79   sFT  0.99996365   +0 51 43.1
 HV4367;UTM  18      - 4,311,641.048   316,343.520   MT  1.00001535   -1 19 55.0
 HV4367
 HV4367!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4367!SPC MD       -   1.00000410  x   0.99995037  =   0.99995447
 HV4367!SPC VA N     -   1.00000410  x   0.99996365  =   0.99996775
 HV4367!UTM  18      -   1.00000410  x   1.00001535  =   1.00001945
 HV4367
 HV4367:                Primary Azimuth Mark                     Grid Az
 HV4367:SPC MD       -  RED                                      083 09 02.4
 HV4367:SPC VA N     -  RED                                      082 12 50.7
 HV4367:UTM  18      -  RED                                      084 24 28.8
 HV4367
 HV4367_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1634311641(NAD 83)
 HV4367
 HV4367|---------------------------------------------------------------------|
 HV4367| PID    Reference Object                     Distance      Geod. Az  |
 HV4367|                                                           dddmmss.s |
 HV4367| HV1826 RED                                 424.846 METERS 0830433.8 |
 HV4367| HV2606 OUT                                 440.435 METERS 1570822.0 |
 HV4367| HV0796 IN                                  267.419 METERS 15802     |
 HV4367|---------------------------------------------------------------------|
 HV4367
 HV4367                          SUPERSEDED SURVEY CONTROL
 HV4367
 HV4367  NAD 83(1991)-  38 56 04.14584(N)    077 07 08.01004(W) AD(       ) 2
 HV4367  NAD 83(1986)-  38 56 04.14520(N)    077 07 08.01952(W) AD(       ) 2
 HV4367  NAD 27      -  38 56 03.74700(N)    077 07 09.08900(W) AD(       ) 2
 HV4367  USSD        -  38 56 04.08700(N)    077 07 08.91700(W) AD(       ) 3
 HV4367
 HV4367.Superseded values are not recommended for survey control.
 HV4367
 HV4367.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4367.See file dsdata.pdf to determine how the superseded data were derived.
 HV4367
 HV4367_MARKER: DS = TRIANGULATION STATION DISK
 HV4367_SETTING: 80 = SET IN A BOULDER
 HV4367_MARK LOGO: CGS
 HV4367_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV4367+STABILITY: SURFACE MOTION
 HV4367
 HV4367  HISTORY     - Date     Condition        Report By
 HV4367  HISTORY     - 1913     MONUMENTED       CGS
 HV4367  HISTORY     - 1925     GOOD             CGS
 HV4367  HISTORY     - 1935     GOOD             CGS
 HV4367  HISTORY     - 1946     GOOD             CGS
 HV4367
 HV4367                          STATION DESCRIPTION
 HV4367
 HV4367'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4367'STATION IS NEARLY 1/2 MILE ABOVE CHAIN BRIDGE, AMONG THE ROCKS
 HV4367'ON THE N SIDE OF THE MAIN CHANNEL OF THE POTOMAC RIVER.  STATION
 HV4367'IS ON LARGE FLAT ROCK ABOUT 10 METERS FROM EDGE OF MAIN
 HV4367'PART OF RIVER CHANNEL AND ABREAST OF LONG LEDGE OF ROCKS
 HV4367'NEAR MIDDLE OF THE STREAM AND OPPOSITE THE FIRST LARGE BEND
 HV4367'IN THE BLUFF ON THE VIRGINIA SIDE OF THE RIVER.  THERE IS
 HV4367'A HIGHER POINT OF ROCKS SOME 10 METERS NW AND ANOTHER ABOUT 7
 HV4367'METERS S FROM THE STATION.  MARKED BY BRONZE DISK IN SOLID
 HV4367'ROCK.
 HV4367
 HV4367                          STATION RECOVERY (1925)
 HV4367
 HV4367'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1925 (GLB)
 HV4367'STATION FOUND AS DESCRIBED.
 HV4367
 HV4367                          STATION RECOVERY (1935)
 HV4367
 HV4367'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4367'STATION RECOVERED AS DESCRIBED.  TO REACH THE STATION GO TO
 HV4367'THE E END OF THE CHAIN BRIDGE, GO DOWN STEPS FROM BRIDGE TO
 HV4367'W BANK OF CANAL AND FOLLOW TOW PATH N FOR ABOUT 600 YARDS TO
 HV4367'A POINT ACROSS CANAL AND ABOUT 40 YARDS S OF A SMALL POWER
 HV4367'HOUSE.  TAKE PATH AT THIS POINT TO LEFT AND FOLLOW ALONG THE
 HV4367'N SIDE OF A DITCH LEADING FROM POWER HOUSE TO POTOMAC RIVER.
 HV4367'FOLLOW THIS PATH TO THE RIVER AND GO N ALONG RIVER BANK TO
 HV4367'THE STATION, A DISTANCE OF ABOUT 250 YARDS.
 HV4367
 HV4367                          STATION RECOVERY (1946)
 HV4367
 HV4367'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4367'STATION IS IN DISTRICT OF COLUMBIA, NOT VIRGINIA.  OTHERWISE,
 HV4367'RECOVERED AS DESCRIBED AND FOUND TO BE IN GOOD CONDITION.
 HV4367'DESCRIPTION IS ADEQUATE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4366 ***********************************************************************
 HV4366  DESIGNATION -  RAPID
 HV4366  PID         -  HV4366
 HV4366  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4366  COUNTRY     -  US
 HV4366  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4366
 HV4366                         *CURRENT SURVEY CONTROL
 HV4366  ______________________________________________________________________
 HV4366* NAD 83(1993) POSITION- 38 56 04.46118(N) 077 07 08.26200(W)   ADJUSTED
 HV4366* NAVD 88 ORTHO HEIGHT -     6.    (meters)       20.    (feet) SCALED
 HV4366  ______________________________________________________________________
 HV4366  GEOID HEIGHT    -        -31.911 (meters)                     GEOID18
 HV4366  LAPLACE CORR    -         -2.15  (seconds)                    DEFLEC18
 HV4366  HORZ ORDER      -  SECOND
 HV4366
 HV4366.The horizontal coordinates were established by classical geodetic methods
 HV4366.and adjusted by the National Geodetic Survey in November 1994.
 HV4366
 HV4366.The orthometric height was scaled from a topographic map.
 HV4366
 HV4366.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4366.GEOID18 height accuracy estimate available here.
 HV4366
 HV4366.Click photographs - Photos may exist for this station.
 HV4366
 HV4366.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4366
 HV4366. The following values were computed from the NAD 83(1993) position.
 HV4366
 HV4366;                    North         East     Units Scale Factor Converg.
 HV4366;SPC MD       -   140,749.864   389,685.809   MT  0.99995037   -0 04 28.8
 HV4366;SPC MD       -   461,776.85  1,278,494.19   sFT  0.99995037   -0 04 28.8
 HV4366;SPC VA N     - 2,141,638.685 3,619,735.617   MT  0.99996366   +0 51 43.0
 HV4366;SPC VA N     - 7,026,359.59 11,875,749.27   sFT  0.99996366   +0 51 43.0
 HV4366;UTM  18      - 4,311,650.881   316,337.637   MT  1.00001538   -1 19 55.2
 HV4366
 HV4366!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4366!SPC MD       -   1.00000410  x   0.99995037  =   0.99995447
 HV4366!SPC VA N     -   1.00000410  x   0.99996366  =   0.99996776
 HV4366!UTM  18      -   1.00000410  x   1.00001538  =   1.00001948
 HV4366
 HV4366:                Primary Azimuth Mark                     Grid Az
 HV4366:SPC MD       -  FILTER 1935                              057 07 01.8
 HV4366:SPC VA N     -  FILTER 1935                              056 10 50.0
 HV4366:UTM  18      -  FILTER 1935                              058 22 28.2
 HV4366
 HV4366_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1633711650(NAD 83)
 HV4366
 HV4366|---------------------------------------------------------------------|
 HV4366| PID    Reference Object                     Distance      Geod. Az  |
 HV4366|                                                           dddmmss.s |
 HV4366| HV3980 FILTER 1935                         APPROX. 0.6 KM 0570233.0 |
 HV4366| HV4367 RAP                                  11.458 METERS 14747     |
 HV4366| HV0796 IN                                  278.701 METERS 15737     |
 HV4366| HV0165 AUX                                  85.412 METERS 18354     |
 HV4366| HV0439 BOUNDARY WITNESS MK 1 DC VA          84.562 METERS 25049     |
 HV4366|---------------------------------------------------------------------|
 HV4366
 HV4366                          SUPERSEDED SURVEY CONTROL
 HV4366
 HV4366  NAD 83(1991)-  38 56 04.46018(N)    077 07 08.26369(W) AD(       ) 2
 HV4366  NAD 83(1986)-  38 56 04.46006(N)    077 07 08.27357(W) AD(       ) 2
 HV4366  NAD 27      -  38 56 04.06100(N)    077 07 09.34300(W) AD(       ) 2
 HV4366
 HV4366.Superseded values are not recommended for survey control.
 HV4366
 HV4366.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4366.See file dsdata.pdf to determine how the superseded data were derived.
 HV4366
 HV4366_MARKER: DS = TRIANGULATION STATION DISK
 HV4366_SETTING: 80 = SET IN A BOULDER
 HV4366_STAMPING: RAPID 1935
 HV4366_MARK LOGO: CGS
 HV4366_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV4366+STABILITY: SURFACE MOTION
 HV4366
 HV4366  HISTORY     - Date     Condition        Report By
 HV4366  HISTORY     - 1935     MONUMENTED       CGS
 HV4366  HISTORY     - 1946     GOOD             CGS
 HV4366  HISTORY     - 1946     GOOD             CGS
 HV4366
 HV4366                          STATION DESCRIPTION
 HV4366
 HV4366'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4366'THIS STATION IS NEARLY 1/2 MILE ABOVE CHAIN BRIDGE AMONG THE
 HV4366'ROCKS ON THE NE SIDE OF THE MAIN CHANNEL OF THE POTOMAC RIVER.
 HV4366'IT IS ON A LARGE IRREGULAR ROCK ABREAST OF THE MIDDLE OF THE
 HV4366'LONG LEDGE OF ROCKS NEAR THE MIDDLE OF THE STREAM AND OPPOSITE
 HV4366'THE FIRST LARGE BEND IN THE BLUFF ON THE VIRGINIA SIDE OF THE
 HV4366'RIVER.  THE STATION IS ABOUT 10 METERS E OF THE E EDGE OF THE
 HV4366'MAIN PART OF THE CHANNEL, AND ABOUT 12 METERS N OF THE U.S.C.
 HV4366'AND G.S. STATION RAP.  STATION RAP COULD NOT BE USED AS THE LINE
 HV4366'TO FILTER IS OBSTRUCTED.
 HV4366'
 HV4366'STATION IS MARKED BY A STANDARD BRONZE DISK WEDGED IN A DRILL
 HV4366'HOLE IN A BOULDER.
 HV4366'
 HV4366'35.974 METERS N OF THE STATION IS A STATION OF THE U.S.P.B.,
 HV4366'WHICH IS MARKED BY A COPPER BOLT SET IN A DRILL HOLE IN A LARGE
 HV4366'BOULDER AND PAINTED ON THE BOULDER ARE THE LETTERS U.S.P.B.
 HV4366'ACCORDING TO F.R. BRANT, OF THE P.B. AND P.P., THIS MARK WAS SET
 HV4366'BY A P.B. AND P.P. TOPOGRAPHIC PARTY BUT NEVER TIED TO THEIR
 HV4366'WORK OR GIVEN A NUMBER.
 HV4366'
 HV4366'TO REACH THIS STATION GO TO THE E END OF THE CHAIN BRIDGE, GO
 HV4366'DOWN STEPS FROM BRIDGE TO W BANK OF CANAL AND GO N ALONG TOW PATH
 HV4366'FOR ABOUT 600 YARDS TO A POINT ACROSS CANAL FROM SMALL POWER
 HV4366'HOUSE AND ABOUT 40 YARDS S OF POWER HOUSE.  TAKE PATH AT THIS
 HV4366'POINT TO THE LEFT WHICH LEADS TO THE MAIN CHANNEL OF THE POTOMAC
 HV4366'ALONG THE N SIDE OF THE DITCH LEADING FROM THE POWERHOUSE TO THE
 HV4366'RIVER.  FOLLOW THE RIVER BANK N ABOUT 250 YARDS TO THE STATION.
 HV4366
 HV4366                          STATION RECOVERY (1946)
 HV4366
 HV4366'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4366'STATION RECOVERED AS DESCRIBED AND FOUND TO BE IN GOOD CONDITION.
 HV4366'DESCRIPTION IS ADEQUATE.
 HV4366
 HV4366                          STATION RECOVERY (1946)
 HV4366
 HV4366'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (RCB)
 HV4366'STATION WAS RECOVERED AS DESCRIBED AND THE MARK WAS IN GOOD
 HV4366'CONDITION.  A COMPLETE NEW DESCRIPTION FOLLOWS--STATION IS LOCATED
 HV4366'ABOUT 1/2 MILE ABOVE THE CHAIN BRIDGE ON THE DISTRICT SIDE OF THE
 HV4366'POTOMAC RIVER.  STATION IS IN A DRILL HOLE IN A LARGE IRREGULAR
 HV4366'ROCK NEAR A LARGE BOULDER WHICH HAS A FIRE BLACKENED STREAK ON
 HV4366'ITS S SIDE.  IT IS ABOUT 30 FEET E OF THE MAIN BANK OF THE RIVER
 HV4366'AND 11.457 METERS N OF TRIANGULATION STATION RAP.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7560 ***********************************************************************
 HV7560  DESIGNATION -  RAY USE 1923
 HV7560  PID         -  HV7560
 HV7560  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7560  COUNTRY     -  US
 HV7560  USGS QUAD   -  ANACOSTIA (2016)
 HV7560
 HV7560                         *CURRENT SURVEY CONTROL
 HV7560  ______________________________________________________________________
 HV7560* NAD 83(1993) POSITION- 38 52 10.90422(N) 076 59 20.65549(W)   ADJUSTED
 HV7560* NAVD 88 ORTHO HEIGHT -     7.48  (+/-2cm)       24.5   (feet) VERTCON3
 HV7560  ______________________________________________________________________
 HV7560  GEOID HEIGHT    -        -32.199 (meters)                     GEOID18
 HV7560  LAPLACE CORR    -         -3.06  (seconds)                    DEFLEC18
 HV7560  HORZ ORDER      -  THIRD
 HV7560  VERT ORDER      -  THIRD ? (See Below)
 HV7560
 HV7560.The horizontal coordinates were established by classical geodetic methods
 HV7560.and adjusted by the National Geodetic Survey in November 1994.
 HV7560
 HV7560.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV7560.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV7560
 HV7560.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7560.GEOID18 height accuracy estimate available here.
 HV7560
 HV7560.The vertical order pertains to the NGVD 29 superseded value.
 HV7560
 HV7560.Click photographs - Photos may exist for this station.
 HV7560
 HV7560.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7560
 HV7560. The following values were computed from the NAD 83(1993) position.
 HV7560
 HV7560;                    North         East     Units Scale Factor Converg.
 HV7560;SPC MD       -   133,541.338   400,948.429   MT  0.99994985   +0 00 24.7
 HV7560;SPC MD       -   438,126.87  1,315,444.97   sFT  0.99994985   +0 00 24.7
 HV7560;SPC VA N     - 2,134,615.099 3,631,114.657   MT  0.99995805   +0 56 34.8
 HV7560;SPC VA N     - 7,003,316.37 11,913,082.00   sFT  0.99995805   +0 56 34.8
 HV7560;UTM  18      - 4,304,196.843   327,439.950   MT  0.99996668   -1 14 54.8
 HV7560
 HV7560!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7560!SPC MD       -   1.00000388  x   0.99994985  =   0.99995373
 HV7560!SPC VA N     -   1.00000388  x   0.99995805  =   0.99996193
 HV7560!UTM  18      -   1.00000388  x   0.99996668  =   0.99997056
 HV7560
 HV7560_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2743904196(NAD 83)
 HV7560
 HV7560|---------------------------------------------------------------------|
 HV7560| PID    Reference Object                     Distance      Geod. Az  |
 HV7560|                                                           dddmmss.s |
 HV7560| HV7573 CHICAGO USE 1923                    369.458 METERS 24917     |
 HV7560| HV7558 BRIDGE USE 1923                     332.879 METERS 32702     |
 HV7560|---------------------------------------------------------------------|
 HV7560
 HV7560                          SUPERSEDED SURVEY CONTROL
 HV7560
 HV7560  NAD 83(1991)-  38 52 10.90281(N)    076 59 20.65669(W) AD(       ) 3
 HV7560  NAD 83(1986)-  38 52 10.90226(N)    076 59 20.66788(W) AD(       ) 3
 HV7560  NAD 27      -  38 52 10.49900(N)    076 59 21.75600(W) AD(       ) 3
 HV7560  NGVD 29               7.72   (m)           25.3    (f) LEVELING    3  
 HV7560
 HV7560.Superseded values are not recommended for survey control.
 HV7560
 HV7560.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7560.See file dsdata.pdf to determine how the superseded data were derived.
 HV7560
 HV7560
 HV7560  HISTORY     - Date     Condition        Report By
 HV7560  HISTORY     - 1923     MONUMENTED       CGS
 HV7560  HISTORY     - 1958     MARK NOT FOUND   CGS
 HV7560
 HV7560                          STATION DESCRIPTION
 HV7560
 HV7560'DESCRIBED BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7560'A THOROUGH SEARCH WAS MADE ALONG THE SEA WALL FOR THIS UNDESCRIBED
 HV7560'STATION WITHOUT RESULTS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1934 ***********************************************************************
 HV1934  DESIGNATION -  RC 1 PBPP
 HV1934  PID         -  HV1934
 HV1934  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1934  COUNTRY     -  US
 HV1934  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1934
 HV1934                         *CURRENT SURVEY CONTROL
 HV1934  ______________________________________________________________________
 HV1934* NAD 83(1986) POSITION- 38 55 59.     (N) 077 03 01.     (W)   SCALED
 HV1934* NAVD 88 ORTHO HEIGHT -    18.94  (+/-2cm)       62.1   (feet) VERTCON3
 HV1934  ______________________________________________________________________
 HV1934  GEOID HEIGHT    -        -31.998 (meters)                     GEOID18
 HV1934  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1934
 HV1934.The horizontal coordinates were scaled from a map and have
 HV1934.an estimated accuracy of +/- 6 seconds.
 HV1934
 HV1934.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1934.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1934
 HV1934.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1934.GEOID18 height accuracy estimate available here.
 HV1934
 HV1934.The vertical order pertains to the NGVD 29 superseded value.
 HV1934
 HV1934.Click photographs - Photos may exist for this station.
 HV1934
 HV1934
 HV1934_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ222113(NAD 83)
 HV1934
 HV1934                          SUPERSEDED SURVEY CONTROL
 HV1934
 HV1934  NGVD 29 (11/26/84)   19.168  (m)           62.89   (f) ADJUSTED    1 2
 HV1934
 HV1934.Superseded values are not recommended for survey control.
 HV1934
 HV1934.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1934.See file dsdata.pdf to determine how the superseded data were derived.
 HV1934
 HV1934_MARKER: DD = SURVEY DISK
 HV1934_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1934_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1934+STABILITY: SURFACE MOTION
 HV1934
 HV1934  HISTORY     - Date     Condition        Report By
 HV1934  HISTORY     - UNK      MONUMENTED       PBPP
 HV1934  HISTORY     - 1926     GOOD             PBPP
 HV1934  HISTORY     - 20081204 MARK NOT FOUND   AMTHOM
 HV1934
 HV1934                          STATION DESCRIPTION
 HV1934
 HV1934'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1934'AT WASHINGTON.
 HV1934'AT WASHINGTON, IN ROCK CREEK PARK, AT THE INTERSECTION OF KLINGLE
 HV1934'ROAD AND BEACH DRIVE NORTHWEST, AT THE NORTH ENTRANCE TO THE
 HV1934'ZOOLOGICAL PARK, AND AT THE SOUTHWEST CORNER OF THE STREET
 HV1934'INTERSECTION.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD
 HV1934'DISK, SET IN THE TOP OF A CONCRETE POST.
 HV1934
 HV1934                          STATION RECOVERY (2008)
 HV1934
 HV1934'RECOVERY NOTE BY A MORTON THOMAS AND ASSOCIATES 2008 (JAN)
 HV1934'KLINGLE ROAD RE-ALIGNED, NEW OVERPASS FOR PORTER STREET
 HV1934'NEW INTERSECTION AND ENTERANCE TO ZOOLOGICAL PARK
 HV1934'NO SIGN OF CONCRETE POST OR DISK
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1943 ***********************************************************************
 HV1943  DESIGNATION -  RC 10 PBPP
 HV1943  PID         -  HV1943
 HV1943  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1943  COUNTRY     -  US
 HV1943  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1943
 HV1943                         *CURRENT SURVEY CONTROL
 HV1943  ______________________________________________________________________
 HV1943* NAD 83(1986) POSITION- 38 57 40.     (N) 077 02 36.     (W)   SCALED
 HV1943* NAVD 88 ORTHO HEIGHT -    44.12  (+/-2cm)      144.8   (feet) VERTCON3
 HV1943  ______________________________________________________________________
 HV1943  GEOID HEIGHT    -        -31.975 (meters)                     GEOID18
 HV1943  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1943
 HV1943.The horizontal coordinates were scaled from a map and have
 HV1943.an estimated accuracy of +/- 6 seconds.
 HV1943
 HV1943.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1943.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1943
 HV1943.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1943.GEOID18 height accuracy estimate available here.
 HV1943
 HV1943.The vertical order pertains to the NGVD 29 superseded value.
 HV1943
 HV1943.Click photographs - Photos may exist for this station.
 HV1943
 HV1943
 HV1943_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ229144(NAD 83)
 HV1943
 HV1943                          SUPERSEDED SURVEY CONTROL
 HV1943
 HV1943  NGVD 29 (11/26/84)   44.340  (m)          145.47   (f) ADJUSTED    1 2
 HV1943
 HV1943.Superseded values are not recommended for survey control.
 HV1943
 HV1943.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1943.See file dsdata.pdf to determine how the superseded data were derived.
 HV1943
 HV1943_MARKER: DD = SURVEY DISK
 HV1943_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1943_STAMPING: 339 12 RC 10
 HV1943_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1943+STABILITY: SURFACE MOTION
 HV1943
 HV1943  HISTORY     - Date     Condition        Report By
 HV1943  HISTORY     - UNK      MONUMENTED       PBPP
 HV1943  HISTORY     - 1926     GOOD             PBPP
 HV1943  HISTORY     - 1944     GOOD             CGS
 HV1943
 HV1943                          STATION DESCRIPTION
 HV1943
 HV1943'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1943'AT WASHINGTON.
 HV1943'AT WASHINGTON, IN ROCK CREEK PARK, AT THE INTERSECTION OF BEACH
 HV1943'DRIVE AND MILITARY ROAD, 82.5 FEET EAST OF THE MILITARY ROAD
 HV1943'BRIDGE OVER ROCK CREEK, 10 FEET SOUTH OF MILITARY ROAD, AND 10
 HV1943'FEET SOUTHWEST OF LIGHT POLE 11.  A PUBLIC BUILDINGS AND PUBLIC
 HV1943'PARKS STANDARD DISK, STAMPED 339 12 RC 10 AND SET IN THE TOP
 HV1943'OF A CONCRETE POST FLUSH WITH THE GROUND.
 HV1943
 HV1943                          STATION RECOVERY (1944)
 HV1943
 HV1943'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1943'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2020 ***********************************************************************
 HV2020  DESIGNATION -  RC 11
 HV2020  PID         -  HV2020
 HV2020  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2020  COUNTRY     -  US
 HV2020  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2020
 HV2020                         *CURRENT SURVEY CONTROL
 HV2020  ______________________________________________________________________
 HV2020* NAD 83(1986) POSITION- 38 57 37.     (N) 077 02 50.     (W)   SCALED
 HV2020* NAVD 88 ORTHO HEIGHT -    59.42  (+/-2cm)      194.9   (feet) VERTCON3
 HV2020  ______________________________________________________________________
 HV2020  GEOID HEIGHT    -        -31.971 (meters)                     GEOID18
 HV2020  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV2020
 HV2020.The horizontal coordinates were scaled from a map and have
 HV2020.an estimated accuracy of +/- 6 seconds.
 HV2020
 HV2020.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV2020.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV2020
 HV2020.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2020.GEOID18 height accuracy estimate available here.
 HV2020
 HV2020.The vertical order pertains to the NGVD 29 superseded value.
 HV2020
 HV2020.Click photographs - Photos may exist for this station.
 HV2020
 HV2020
 HV2020_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ226143(NAD 83)
 HV2020
 HV2020                          SUPERSEDED SURVEY CONTROL
 HV2020
 HV2020  NGVD 29 (11/26/84)   59.641  (m)          195.67   (f) ADJUSTED    1 2
 HV2020
 HV2020.Superseded values are not recommended for survey control.
 HV2020
 HV2020.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2020.See file dsdata.pdf to determine how the superseded data were derived.
 HV2020
 HV2020_MARKER: DD = SURVEY DISK
 HV2020_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV2020_MARK LOGO: PBPP
 HV2020_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV2020+STABILITY: SURFACE MOTION
 HV2020
 HV2020  HISTORY     - Date     Condition        Report By
 HV2020  HISTORY     - UNK      MONUMENTED       PBPP
 HV2020  HISTORY     - 1971     GOOD             NGS
 HV2020
 HV2020                          STATION DESCRIPTION
 HV2020
 HV2020'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV2020'AT WASHINGTON.
 HV2020'AT WASHINGTON, IN ROCK CREEK PARK, ON MILITARY ROAD, NEAR THE
 HV2020'BRIDGE OVER ROCK CREEK, 44.2 FEET SOUTHEAST OF THE EIGHTH
 HV2020'LAMPPOST WEST OF THE BRIDGE, 17 FEET SOUTH OF THE CENTERLINE OF
 HV2020'THE ROAD, 66 FEET SOUTHWEST OF A 24-INCH POPLAR TREE, AND 35.5
 HV2020'FEET SOUTH OF A 12-INCH WHITE OAK TREE.  A PUBLIC BUILDINGS AND
 HV2020'PUBLIC PARKS STANDARD TRIANGULATION-STATION DISK, SET IN THE TOP
 HV2020'OF A CONCRETE POST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2021 ***********************************************************************
 HV2021  DESIGNATION -  RC 13
 HV2021  PID         -  HV2021
 HV2021  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2021  COUNTRY     -  US
 HV2021  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2021
 HV2021                         *CURRENT SURVEY CONTROL
 HV2021  ______________________________________________________________________
 HV2021* NAD 83(1986) POSITION- 38 57 37.     (N) 077 03 22.     (W)   SCALED
 HV2021* NAVD 88 ORTHO HEIGHT -    98.38  (+/-2cm)      322.8   (feet) VERTCON3
 HV2021  ______________________________________________________________________
 HV2021  GEOID HEIGHT    -        -31.958 (meters)                     GEOID18
 HV2021  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV2021
 HV2021.The horizontal coordinates were scaled from a map and have
 HV2021.an estimated accuracy of +/- 6 seconds.
 HV2021
 HV2021.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV2021.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV2021
 HV2021.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2021.GEOID18 height accuracy estimate available here.
 HV2021
 HV2021.The vertical order pertains to the NGVD 29 superseded value.
 HV2021
 HV2021.Click photographs - Photos may exist for this station.
 HV2021
 HV2021
 HV2021_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ218143(NAD 83)
 HV2021
 HV2021                          SUPERSEDED SURVEY CONTROL
 HV2021
 HV2021  NGVD 29 (11/26/84)   98.601  (m)          323.49   (f) ADJUSTED    1 2
 HV2021
 HV2021.Superseded values are not recommended for survey control.
 HV2021
 HV2021.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2021.See file dsdata.pdf to determine how the superseded data were derived.
 HV2021
 HV2021_MARKER: DD = SURVEY DISK
 HV2021_SETTING: 17 = SET INTO TOP OF METAL PIPE DRIVEN INTO GROUND
 HV2021_MARK LOGO: PBPP
 HV2021_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2021
 HV2021  HISTORY     - Date     Condition        Report By
 HV2021  HISTORY     - UNK      MONUMENTED       PBPP
 HV2021  HISTORY     - 1971     GOOD             NGS
 HV2021
 HV2021                          STATION DESCRIPTION
 HV2021
 HV2021'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV2021'AT WASHINGTON.
 HV2021'AT WASHINGTON, IN ROCK CREEK PARK, 250 FEET SOUTHEAST OF THE
 HV2021'INTERSECTION OF MILITARY ROAD AND ROCK CREEK FORD ROAD, AND ON
 HV2021'THE TOP OF A SMALL HILL.  A PUBLIC BUILDINGS AND PUBLIC PARKS
 HV2021'STANDARD TRIANGULATION-STATION DISK, SET IN THE TOP OF A
 HV2021'CONCRETE-FILLED 5-INCH IRON PIPE PROJECTING 3 INCHES ABOVE
 HV2021'GROUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2022 ***********************************************************************
 HV2022  DESIGNATION -  RC 14 PBPP
 HV2022  PID         -  HV2022
 HV2022  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2022  COUNTRY     -  US
 HV2022  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2022
 HV2022                         *CURRENT SURVEY CONTROL
 HV2022  ______________________________________________________________________
 HV2022* NAD 83(1986) POSITION- 38 57 39.     (N) 077 03 23.     (W)   SCALED
 HV2022* NAVD 88 ORTHO HEIGHT -    93.09  (+/-2cm)      305.4   (feet) VERTCON3
 HV2022  ______________________________________________________________________
 HV2022  GEOID HEIGHT    -        -31.957 (meters)                     GEOID18
 HV2022  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV2022
 HV2022.The horizontal coordinates were scaled from a map and have
 HV2022.an estimated accuracy of +/- 6 seconds.
 HV2022
 HV2022.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV2022.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV2022
 HV2022.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2022.GEOID18 height accuracy estimate available here.
 HV2022
 HV2022.The vertical order pertains to the NGVD 29 superseded value.
 HV2022
 HV2022.Click photographs - Photos may exist for this station.
 HV2022
 HV2022
 HV2022_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ218144(NAD 83)
 HV2022
 HV2022                          SUPERSEDED SURVEY CONTROL
 HV2022
 HV2022  NGVD 29 (11/26/84)   93.309  (m)          306.13   (f) ADJUSTED    1 2
 HV2022
 HV2022.Superseded values are not recommended for survey control.
 HV2022
 HV2022.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2022.See file dsdata.pdf to determine how the superseded data were derived.
 HV2022
 HV2022_MARKER: DD = SURVEY DISK
 HV2022_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2022_SP_SET: CONCRETE BASE
 HV2022_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2022
 HV2022  HISTORY     - Date     Condition        Report By
 HV2022  HISTORY     - UNK      MONUMENTED       PBPP
 HV2022  HISTORY     - 1971     GOOD             NGS
 HV2022
 HV2022                          STATION DESCRIPTION
 HV2022
 HV2022'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV2022'AT WASHINGTON.
 HV2022'AT WASHINGTON, ON MILITARY ROAD, AT THE INTERSECTION OF ROCK
 HV2022'CREEK FORD ROAD, AT THE NORTHEAST CORNER OF THE INTERSECTION, IN
 HV2022'THE TOP OF THE SQUARE CONCRETE BASE SUPPORTING AN IRON MANHOLE
 HV2022'COVER, 1.6 FEET EAST OF THE CENTER OF THE MANHOLE, AND 0.5 FOOT
 HV2022'WEST OF THE EAST EDGE OF THE BASE.  A PUBLIC BUILDINGS AND PUBLIC
 HV2022'PARKS STANDARD DISK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1944 ***********************************************************************
 HV1944  DESIGNATION -  RC 15 PBPP
 HV1944  PID         -  HV1944
 HV1944  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1944  COUNTRY     -  US
 HV1944  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1944
 HV1944                         *CURRENT SURVEY CONTROL
 HV1944  ______________________________________________________________________
 HV1944* NAD 83(1986) POSITION- 38 57 54.     (N) 077 02 51.     (W)   SCALED
 HV1944* NAVD 88 ORTHO HEIGHT -    44.08  (+/-2cm)      144.6   (feet) VERTCON3
 HV1944  ______________________________________________________________________
 HV1944  GEOID HEIGHT    -        -31.966 (meters)                     GEOID18
 HV1944  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1944
 HV1944.The horizontal coordinates were scaled from a map and have
 HV1944.an estimated accuracy of +/- 6 seconds.
 HV1944
 HV1944.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1944.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1944
 HV1944.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1944.GEOID18 height accuracy estimate available here.
 HV1944
 HV1944.The vertical order pertains to the NGVD 29 superseded value.
 HV1944
 HV1944.Click photographs - Photos may exist for this station.
 HV1944
 HV1944
 HV1944_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ226148(NAD 83)
 HV1944
 HV1944                          SUPERSEDED SURVEY CONTROL
 HV1944
 HV1944  NGVD 29 (11/26/84)   44.299  (m)          145.34   (f) ADJUSTED    1 2
 HV1944
 HV1944.Superseded values are not recommended for survey control.
 HV1944
 HV1944.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1944.See file dsdata.pdf to determine how the superseded data were derived.
 HV1944
 HV1944_MARKER: DD = SURVEY DISK
 HV1944_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1944_SP_SET: CONCRETE PLATFORM
 HV1944_STAMPING: RC 15
 HV1944_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1944
 HV1944  HISTORY     - Date     Condition        Report By
 HV1944  HISTORY     - UNK      MONUMENTED       PBPP
 HV1944  HISTORY     - 1926     GOOD             PBPP
 HV1944  HISTORY     - 1944     GOOD             CGS
 HV1944  HISTORY     - 20101030 MARK NOT FOUND   GEOCAC
 HV1944
 HV1944                          STATION DESCRIPTION
 HV1944
 HV1944'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1944'AT WASHINGTON.
 HV1944'AT WASHINGTON, IN ROCK CREEK PARK, 0.4 MILE NORTH ALONG BEACH
 HV1944'DRIVE FROM THE INTERSECTION OF MILITARY ROAD, AT THE SOUTHEAST
 HV1944'END OF MILKHOUSE FORD, AND IN THE TOP OF THE CONCRETE PLATFORM
 HV1944'AROUND A MANHOLE.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD
 HV1944'DISK, STAMPED RC 15.
 HV1944
 HV1944                          STATION RECOVERY (1944)
 HV1944
 HV1944'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1944'RECOVERED IN GOOD CONDITION.
 HV1944
 HV1944                          STATION RECOVERY (2010)
 HV1944
 HV1944'RECOVERY NOTE BY GEOCACHING 2010 (RLM)
 HV1944'THE CONCRETE PLATFORM HAS BEEN REDONE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1945 ***********************************************************************
 HV1945  DESIGNATION -  RC 16 PBPP
 HV1945  PID         -  HV1945
 HV1945  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1945  COUNTRY     -  US
 HV1945  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1945
 HV1945                         *CURRENT SURVEY CONTROL
 HV1945  ______________________________________________________________________
 HV1945* NAD 83(1986) POSITION- 38 58 16.     (N) 077 02 39.     (W)   SCALED
 HV1945* NAVD 88 ORTHO HEIGHT -    48.92  (+/-2cm)      160.5   (feet) VERTCON3
 HV1945  ______________________________________________________________________
 HV1945  GEOID HEIGHT    -        -31.965 (meters)                     GEOID18
 HV1945  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1945
 HV1945.The horizontal coordinates were scaled from a map and have
 HV1945.an estimated accuracy of +/- 6 seconds.
 HV1945
 HV1945.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1945.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1945
 HV1945.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1945.GEOID18 height accuracy estimate available here.
 HV1945
 HV1945.The vertical order pertains to the NGVD 29 superseded value.
 HV1945
 HV1945.Click photographs - Photos may exist for this station.
 HV1945
 HV1945
 HV1945_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ229155(NAD 83)
 HV1945
 HV1945                          SUPERSEDED SURVEY CONTROL
 HV1945
 HV1945  NGVD 29 (11/26/84)   49.141  (m)          161.22   (f) ADJUSTED    1 2
 HV1945
 HV1945.Superseded values are not recommended for survey control.
 HV1945
 HV1945.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1945.See file dsdata.pdf to determine how the superseded data were derived.
 HV1945
 HV1945_MARKER: DD = SURVEY DISK
 HV1945_SETTING: 80 = SET IN A BOULDER
 HV1945_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1945+STABILITY: SURFACE MOTION
 HV1945
 HV1945  HISTORY     - Date     Condition        Report By
 HV1945  HISTORY     - UNK      MONUMENTED       PBPP
 HV1945  HISTORY     - 1926     GOOD             PBPP
 HV1945
 HV1945                          STATION DESCRIPTION
 HV1945
 HV1945'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1945'AT WASHINGTON.
 HV1945'AT WASHINGTON, IN ROCK CREEK PARK, ABOUT 1 MILE NORTH ALONG BEACH
 HV1945'DRIVE FROM MILKHOUSE FORD, 80 FEET WEST OF A SMALL CULVERT UNDER
 HV1945'BEACH DRIVE, 20 FEET NORTH OF A PATH LEADING TO A SPRING, NEAR
 HV1945'A SMALL WOODEN BRIDGE OVER ROCK CREEK, AND IN THE TOP OF A LARGE
 HV1945'BOULDER.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1946 ***********************************************************************
 HV1946  DESIGNATION -  RC 17
 HV1946  PID         -  HV1946
 HV1946  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1946  COUNTRY     -  US
 HV1946  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1946
 HV1946                         *CURRENT SURVEY CONTROL
 HV1946  ______________________________________________________________________
 HV1946* NAD 83(1986) POSITION- 38 58 19.     (N) 077 02 27.     (W)   SCALED
 HV1946* NAVD 88 ORTHO HEIGHT -    48.64  (+/-2cm)      159.6   (feet) VERTCON3
 HV1946  ______________________________________________________________________
 HV1946  GEOID HEIGHT    -        -31.969 (meters)                     GEOID18
 HV1946  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1946
 HV1946.The horizontal coordinates were scaled from a map and have
 HV1946.an estimated accuracy of +/- 6 seconds.
 HV1946
 HV1946.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1946.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1946
 HV1946.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1946.GEOID18 height accuracy estimate available here.
 HV1946
 HV1946.The vertical order pertains to the NGVD 29 superseded value.
 HV1946
 HV1946.Click photographs - Photos may exist for this station.
 HV1946
 HV1946
 HV1946_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ232156(NAD 83)
 HV1946
 HV1946                          SUPERSEDED SURVEY CONTROL
 HV1946
 HV1946  NGVD 29 (11/26/84)   48.864  (m)          160.31   (f) ADJUSTED    1 2
 HV1946
 HV1946.Superseded values are not recommended for survey control.
 HV1946
 HV1946.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1946.See file dsdata.pdf to determine how the superseded data were derived.
 HV1946
 HV1946_MARKER: DD = SURVEY DISK
 HV1946_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1946_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1946+STABILITY: SURFACE MOTION
 HV1946
 HV1946  HISTORY     - Date     Condition        Report By
 HV1946  HISTORY     - UNK      MONUMENTED       PBPP
 HV1946  HISTORY     - 1926     GOOD             PBPP
 HV1946  HISTORY     - 19900406 MARK NOT FOUND   NGS
 HV1946
 HV1946                          STATION DESCRIPTION
 HV1946
 HV1946'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1946'AT WASHINGTON.
 HV1946'AT WASHINGTON, IN ROCK CREEK PARK, ON BEACH DRIVE, AT THE FIRST
 HV1946'CURVE SOUTH OF SHERRILL DRIVE, 21 FEET SOUTHEAST OF LAMPPOST 140,
 HV1946'AND 18 FEET EAST OF BEACH DRIVE.  A PUBLIC BUILDINGS AND PUBLIC
 HV1946'PARKS STANDARD TRIANGULATION-STATION DISK, SET IN THE TOP OF A
 HV1946'CONCRETE POST.
 HV1946
 HV1946                          STATION RECOVERY (1990)
 HV1946
 HV1946'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990
 HV1946'THE AREA HAS BEEN LANDSCAPED AND IS NOW A PICNIC AREA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1947 ***********************************************************************
 HV1947  DESIGNATION -  RC 18
 HV1947  PID         -  HV1947
 HV1947  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1947  COUNTRY     -  US
 HV1947  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1947
 HV1947                         *CURRENT SURVEY CONTROL
 HV1947  ______________________________________________________________________
 HV1947* NAD 83(1986) POSITION- 38 58 32.     (N) 077 02 26.     (W)   SCALED
 HV1947* NAVD 88 ORTHO HEIGHT -    50.41  (+/-2cm)      165.4   (feet) VERTCON3
 HV1947  ______________________________________________________________________
 HV1947  GEOID HEIGHT    -        -31.967 (meters)                     GEOID18
 HV1947  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1947
 HV1947.The horizontal coordinates were scaled from a map and have
 HV1947.an estimated accuracy of +/- 6 seconds.
 HV1947
 HV1947.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1947.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1947
 HV1947.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1947.GEOID18 height accuracy estimate available here.
 HV1947
 HV1947.The vertical order pertains to the NGVD 29 superseded value.
 HV1947
 HV1947.Click photographs - Photos may exist for this station.
 HV1947
 HV1947
 HV1947_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ232160(NAD 83)
 HV1947
 HV1947                          SUPERSEDED SURVEY CONTROL
 HV1947
 HV1947  NGVD 29 (11/26/84)   50.626  (m)          166.10   (f) ADJUSTED    1 2
 HV1947
 HV1947.Superseded values are not recommended for survey control.
 HV1947
 HV1947.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1947.See file dsdata.pdf to determine how the superseded data were derived.
 HV1947
 HV1947_MARKER: DD = SURVEY DISK
 HV1947_SETTING: 66 = SET IN ROCK OUTCROP
 HV1947_STAMPING: RC 18
 HV1947_MARK LOGO: PBPP
 HV1947_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 HV1947+STABILITY: POSITION/ELEVATION WELL
 HV1947
 HV1947  HISTORY     - Date     Condition        Report By
 HV1947  HISTORY     - UNK      MONUMENTED       PBPP
 HV1947  HISTORY     - 1926     GOOD             PBPP
 HV1947  HISTORY     - 19900406 MARK NOT FOUND   NGS
 HV1947
 HV1947                          STATION DESCRIPTION
 HV1947
 HV1947'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1947'AT WASHINGTON.
 HV1947'AT WASHINGTON, IN ROCK CREEK PARK, ABOUT 1/4 MILE NORTH ALONG
 HV1947'BEACH DRIVE FROM BENCH MARK RC 17 DESCRIBED ABOVE, 65 FEET NORTH
 HV1947'OF LAMPPOST 133, 17 FEET WEST OF THE CENTERLINE OF BEACH DRIVE,
 HV1947'AND IN THE TOP OF A GRANITE LEDGE.  A PUBLIC BUILDINGS AND PUBLIC
 HV1947'PARKS STANDARD DISK.
 HV1947
 HV1947                          STATION RECOVERY (1990)
 HV1947
 HV1947'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990
 HV1947'THERE HAS BEEN HIGHWAY CONSTRUCTION AT THE DESCRIBED LOCATION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1948 ***********************************************************************
 HV1948  DESIGNATION -  RC 19
 HV1948  PID         -  HV1948
 HV1948  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1948  COUNTRY     -  US
 HV1948  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1948
 HV1948                         *CURRENT SURVEY CONTROL
 HV1948  ______________________________________________________________________
 HV1948* NAD 83(1986) POSITION- 38 58 54.     (N) 077 02 33.     (W)   SCALED
 HV1948* NAVD 88 ORTHO HEIGHT -    63.87  (+/-2cm)      209.5   (feet) VERTCON3
 HV1948  ______________________________________________________________________
 HV1948  GEOID HEIGHT    -        -31.960 (meters)                     GEOID18
 HV1948  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1948
 HV1948.The horizontal coordinates were scaled from a map and have
 HV1948.an estimated accuracy of +/- 6 seconds.
 HV1948
 HV1948.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1948.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1948
 HV1948.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1948.GEOID18 height accuracy estimate available here.
 HV1948
 HV1948.The vertical order pertains to the NGVD 29 superseded value.
 HV1948
 HV1948.Click photographs - Photos may exist for this station.
 HV1948
 HV1948
 HV1948_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ230167(NAD 83)
 HV1948
 HV1948                          SUPERSEDED SURVEY CONTROL
 HV1948
 HV1948  NGVD 29 (11/26/84)   64.090  (m)          210.27   (f) ADJUSTED    1 2
 HV1948
 HV1948.Superseded values are not recommended for survey control.
 HV1948
 HV1948.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1948.See file dsdata.pdf to determine how the superseded data were derived.
 HV1948
 HV1948_MARKER: DD = SURVEY DISK
 HV1948_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1948_STAMPING: RC 19
 HV1948_MARK LOGO: PBPP
 HV1948_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1948+STABILITY: SURFACE MOTION
 HV1948
 HV1948  HISTORY     - Date     Condition        Report By
 HV1948  HISTORY     - UNK      MONUMENTED       PBPP
 HV1948  HISTORY     - 1926     GOOD             PBPP
 HV1948  HISTORY     - 1944     GOOD             CGS
 HV1948  HISTORY     - 19900406 MARK NOT FOUND   NGS
 HV1948
 HV1948                          STATION DESCRIPTION
 HV1948
 HV1948'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1948'AT WASHINGTON.
 HV1948'AT WASHINGTON, IN ROCK CREEK PARK, ON BEACH DRIVE, 125 FEET SOUTH
 HV1948'OF THE JUNCTION OF WISE ROAD, IN A LEVEL OPEN GRASSY SPACE AT THE
 HV1948'TOP OF A STEEP HILL, 19 FEET NORTH OF LAMPPOST 175, AND 10 FEET
 HV1948'EAST OF BEACH DRIVE.  A PUBLIC BUILDINGS AND PUBLIC PARKS
 HV1948'STANDARD DISK, SET IN THE TOP OF A CONCRETE POST.
 HV1948
 HV1948                          STATION RECOVERY (1944)
 HV1948
 HV1948'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1948'RECOVERED IN GOOD CONDITION.
 HV1948
 HV1948                          STATION RECOVERY (1990)
 HV1948
 HV1948'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990
 HV1948'THERE HAS BEEN HIGHWAY CONSTRUCTION AT THE DESCRIBED LOCATION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1935 ***********************************************************************
 HV1935  DESIGNATION -  RC 2 PBPP
 HV1935  PID         -  HV1935
 HV1935  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1935  COUNTRY     -  US
 HV1935  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1935
 HV1935                         *CURRENT SURVEY CONTROL
 HV1935  ______________________________________________________________________
 HV1935* NAD 83(1986) POSITION- 38 56 06.     (N) 077 02 52.     (W)   SCALED
 HV1935* NAVD 88 ORTHO HEIGHT -    17.99  (+/-2cm)       59.0   (feet) VERTCON3
 HV1935  ______________________________________________________________________
 HV1935  GEOID HEIGHT    -        -31.999 (meters)                     GEOID18
 HV1935  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1935
 HV1935.The horizontal coordinates were scaled from a map and have
 HV1935.an estimated accuracy of +/- 6 seconds.
 HV1935
 HV1935.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1935.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1935
 HV1935.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1935.GEOID18 height accuracy estimate available here.
 HV1935
 HV1935.The vertical order pertains to the NGVD 29 superseded value.
 HV1935
 HV1935.Click photographs - Photos may exist for this station.
 HV1935
 HV1935
 HV1935_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ225115(NAD 83)
 HV1935
 HV1935                          SUPERSEDED SURVEY CONTROL
 HV1935
 HV1935  NGVD 29 (11/26/84)   18.213  (m)           59.75   (f) ADJUSTED    1 2
 HV1935
 HV1935.Superseded values are not recommended for survey control.
 HV1935
 HV1935.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1935.See file dsdata.pdf to determine how the superseded data were derived.
 HV1935
 HV1935_MARKER: DD = SURVEY DISK
 HV1935_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1935_SP_SET: GRANITE GUARDRAIL
 HV1935_STAMPING: RC 2
 HV1935_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1935
 HV1935  HISTORY     - Date     Condition        Report By
 HV1935  HISTORY     - UNK      MONUMENTED       PBPP
 HV1935  HISTORY     - 1926     GOOD             PBPP
 HV1935  HISTORY     - 1944     GOOD             CGS
 HV1935  HISTORY     - 20081204 MARK NOT FOUND   AMTHOM
 HV1935
 HV1935                          STATION DESCRIPTION
 HV1935
 HV1935'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1935'AT WASHINGTON.
 HV1935'AT WASHINGTON, IN ROCK CREEK PARK, ON BEACH DRIVE, AT THE SOUTHWEST
 HV1935'CORNER OF THE BRIDGE OVER PINEY BRANCH, IN THE TOP OF THE GRANITE
 HV1935'GUARDRAIL, 1 FOOT NORTH OF THE END POST, AND ABOUT 2-1/2 FEET
 HV1935'HIGHER THAN BEACH DRIVE.  A PUBLIC BUILDINGS AND PUBLIC PARKS
 HV1935'STANDARD DISK, STAMPED RC 2.
 HV1935
 HV1935                          STATION RECOVERY (1944)
 HV1935
 HV1935'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1935'RECOVERED IN GOOD CONDITION.
 HV1935
 HV1935                          STATION RECOVERY (2008)
 HV1935
 HV1935'RECOVERY NOTE BY A MORTON THOMAS AND ASSOCIATES 2008 (JAN)
 HV1935'GRANITE GUARDRAIL NO LONGER EXISTS
 HV1935'STEEL PIPE GUARDRAIL NOW IN PLACE
 HV1935'NO SIGN OF DISK
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1949 ***********************************************************************
 HV1949  DESIGNATION -  RC 20
 HV1949  PID         -  HV1949
 HV1949  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1949  COUNTRY     -  US
 HV1949  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1949
 HV1949                         *CURRENT SURVEY CONTROL
 HV1949  ______________________________________________________________________
 HV1949* NAD 83(1986) POSITION- 38 59 00.     (N) 077 02 34.     (W)   SCALED
 HV1949* NAVD 88 ORTHO HEIGHT -    57.89  (+/-2cm)      189.9   (feet) VERTCON3
 HV1949  ______________________________________________________________________
 HV1949  GEOID HEIGHT    -        -31.958 (meters)                     GEOID18
 HV1949  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1949
 HV1949.The horizontal coordinates were scaled from a map and have
 HV1949.an estimated accuracy of +/- 6 seconds.
 HV1949
 HV1949.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1949.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1949
 HV1949.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1949.GEOID18 height accuracy estimate available here.
 HV1949
 HV1949.The vertical order pertains to the NGVD 29 superseded value.
 HV1949
 HV1949.Click photographs - Photos may exist for this station.
 HV1949
 HV1949
 HV1949_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ230169(NAD 83)
 HV1949
 HV1949                          SUPERSEDED SURVEY CONTROL
 HV1949
 HV1949  NGVD 29 (11/26/84)   58.105  (m)          190.63   (f) ADJUSTED    1 2
 HV1949
 HV1949.Superseded values are not recommended for survey control.
 HV1949
 HV1949.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1949.See file dsdata.pdf to determine how the superseded data were derived.
 HV1949
 HV1949_MARKER: DD = SURVEY DISK
 HV1949_SETTING: 66 = SET IN ROCK OUTCROP
 HV1949_STAMPING: RC 20
 HV1949_MARK LOGO: PBPP
 HV1949_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 HV1949+STABILITY: POSITION/ELEVATION WELL
 HV1949
 HV1949  HISTORY     - Date     Condition        Report By
 HV1949  HISTORY     - UNK      MONUMENTED       PBPP
 HV1949  HISTORY     - 1926     GOOD             PBPP
 HV1949  HISTORY     - 19900406 MARK NOT FOUND   NGS
 HV1949
 HV1949                          STATION DESCRIPTION
 HV1949
 HV1949'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1949'AT WASHINGTON.
 HV1949'AT WASHINGTON, IN ROCK CREEK PARK, ON BEACH DRIVE, 0.1 MILE NORTH
 HV1949'OF BENCH MARK RC 19 DESCRIBED ABOVE, 150 FEET SOUTHWEST OF THE
 HV1949'SOUTHWEST CORNER OF A BRIDGE OVER ROCK CREEK, 50 FEET WEST OF
 HV1949'THE LAMPPOST JUST SOUTH OF THE BRIDGE, AND IN THE TOP OF A ROCK
 HV1949'LEDGE.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK.
 HV1949
 HV1949                          STATION RECOVERY (1990)
 HV1949
 HV1949'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990
 HV1949'THE BRIDGE HAS BEEN REPLACED AND THERE HAS BEEN HIGHWAY CONSTRUCTION
 HV1949'AT THE DESCRIBED LOCATION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2132 ***********************************************************************
 HV2132  DESIGNATION -  RC 24 MADHOP
 HV2132  PID         -  HV2132
 HV2132  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2132  COUNTRY     -  US
 HV2132  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2132
 HV2132                         *CURRENT SURVEY CONTROL
 HV2132  ______________________________________________________________________
 HV2132* NAD 83(1986) POSITION- 38 58 35.     (N) 077 03 09.     (W)   SCALED
 HV2132* NAVD 88 ORTHO HEIGHT -    63.454 (meters)      208.18  (feet) ADJUSTED
 HV2132  ______________________________________________________________________
 HV2132  GEOID HEIGHT    -        -31.950 (meters)                     GEOID18
 HV2132  DYNAMIC HEIGHT  -         63.420 (meters)      208.07  (feet) COMP
 HV2132  MODELED GRAVITY -    980,086.1   (mgal)                       NAVD 88
 HV2132
 HV2132  VERT ORDER      -  SECOND    CLASS 0
 HV2132
 HV2132.The horizontal coordinates were scaled from a map and have
 HV2132.an estimated accuracy of +/- 6 seconds.
 HV2132
 HV2132.The orthometric height was determined by differential leveling and
 HV2132.adjusted by the NATIONAL GEODETIC SURVEY
 HV2132.in June 1991.
 HV2132
 HV2132.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2132.GEOID18 height accuracy estimate available here.
 HV2132
 HV2132.Click photographs - Photos may exist for this station.
 HV2132
 HV2132.The dynamic height is computed by dividing the NAVD 88
 HV2132.geopotential number by the normal gravity value computed on the
 HV2132.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2132.degrees latitude (g = 980.6199 gals.).
 HV2132
 HV2132.The modeled gravity was interpolated from observed gravity values.
 HV2132
 HV2132
 HV2132_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ222161(NAD 83)
 HV2132
 HV2132                          SUPERSEDED SURVEY CONTROL
 HV2132
 HV2132  NGVD 29 (11/26/84)   63.684  (m)          208.94   (f) ADJUSTED    2 0
 HV2132
 HV2132.Superseded values are not recommended for survey control.
 HV2132
 HV2132.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2132.See file dsdata.pdf to determine how the superseded data were derived.
 HV2132
 HV2132_MARKER: Z = SEE DESCRIPTION
 HV2132_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2132_SP_SET: STREET
 HV2132_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2132
 HV2132  HISTORY     - Date     Condition        Report By
 HV2132  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2132  HISTORY     - 1960     GOOD             MADHOP
 HV2132
 HV2132                          STATION DESCRIPTION
 HV2132
 HV2132'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2132'IN WASHINGTON DC.
 HV2132'LOCATED ON OREGON AVE. N.W. BETWEEN NEBRASKA AVE. AND CHESTNUT
 HV2132'ST. (ABOUT 1200 FT SOUTH OF CHESTNUT ST.) 5.42 FT NORTH EAST OF
 HV2132'P.E.P.C.O. POLE 13957, AND 24.51 FT NORTHWEST OF NAIL ON
 HV2132'SOUTHWEST CORNER OF PARAPET WALL OVER A CREEK ON THE EAST SIDE OF
 HV2132'OREGON AVE., AND 15.16 FT SOUTH OF SOUTHEAST CORNER OF PARAPET
 HV2132'WALL ON WEST SIDE OF OREGON AVE.  A PIPE AND SCREW 1 IN BELOW
 HV2132'SURFACE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1936 ***********************************************************************
 HV1936  DESIGNATION -  RC 3 PBPP
 HV1936  PID         -  HV1936
 HV1936  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1936  COUNTRY     -  US
 HV1936  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1936
 HV1936                         *CURRENT SURVEY CONTROL
 HV1936  ______________________________________________________________________
 HV1936* NAD 83(1986) POSITION- 38 56 07.     (N) 077 02 45.     (W)   SCALED
 HV1936* NAVD 88 ORTHO HEIGHT -    33.84  (+/-2cm)      111.0   (feet) VERTCON3
 HV1936  ______________________________________________________________________
 HV1936  GEOID HEIGHT    -        -32.001 (meters)                     GEOID18
 HV1936  VERT ORDER      -  SECOND    CLASS I (See Below)
 HV1936
 HV1936.The horizontal coordinates were scaled from a map and have
 HV1936.an estimated accuracy of +/- 6 seconds.
 HV1936
 HV1936.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1936.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1936
 HV1936.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1936.GEOID18 height accuracy estimate available here.
 HV1936
 HV1936.The vertical order pertains to the NGVD 29 superseded value.
 HV1936
 HV1936.Click photographs - Photos may exist for this station.
 HV1936
 HV1936
 HV1936_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ226115(NAD 83)
 HV1936
 HV1936                          SUPERSEDED SURVEY CONTROL
 HV1936
 HV1936  NGVD 29 (11/26/84)   34.063  (m)          111.76   (f) ADJUSTED    2 1
 HV1936
 HV1936.Superseded values are not recommended for survey control.
 HV1936
 HV1936.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1936.See file dsdata.pdf to determine how the superseded data were derived.
 HV1936
 HV1936_MARKER: DD = SURVEY DISK
 HV1936_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1936_SP_SET: BRIDGE
 HV1936_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1936
 HV1936  HISTORY     - Date     Condition        Report By
 HV1936  HISTORY     - UNK      MONUMENTED       PBPP
 HV1936  HISTORY     - 1926     GOOD             PBPP
 HV1936
 HV1936                          STATION DESCRIPTION
 HV1936
 HV1936'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1936'AT WASHINGTON.
 HV1936'AT WASHINGTON, IN ROCK CREEK PARK, AT THE PARK ROAD BRIDGE OVER
 HV1936'PINEY BRANCH PARKWAY, AT THE SOUTH ABUTMENT ON THE WEST SIDE OF
 HV1936'THE BRIDGE, IN THE TOP OF THE CONCRETE WALL, AND 1 FOOT SOUTH
 HV1936'OF THE SOUTH END OF THE WEST RAILING.  A PUBLIC BUILDINGS AND
 HV1936'PUBLIC PARKS STANDARD DISK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1937 ***********************************************************************
 HV1937  DESIGNATION -  RC 4 PBPP
 HV1937  PID         -  HV1937
 HV1937  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1937  COUNTRY     -  US
 HV1937  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1937
 HV1937                         *CURRENT SURVEY CONTROL
 HV1937  ______________________________________________________________________
 HV1937* NAD 83(1986) POSITION- 38 56 22.     (N) 077 03 05.     (W)   SCALED
 HV1937* NAVD 88 ORTHO HEIGHT -    18.51  (+/-2cm)       60.7   (feet) VERTCON3
 HV1937  ______________________________________________________________________
 HV1937  GEOID HEIGHT    -        -31.989 (meters)                     GEOID18
 HV1937  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1937
 HV1937.The horizontal coordinates were scaled from a map and have
 HV1937.an estimated accuracy of +/- 6 seconds.
 HV1937
 HV1937.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1937.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1937
 HV1937.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1937.GEOID18 height accuracy estimate available here.
 HV1937
 HV1937.The vertical order pertains to the NGVD 29 superseded value.
 HV1937
 HV1937.Click photographs - Photos may exist for this station.
 HV1937
 HV1937
 HV1937_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ222120(NAD 83)
 HV1937
 HV1937                          SUPERSEDED SURVEY CONTROL
 HV1937
 HV1937  NGVD 29 (11/26/84)   18.735  (m)           61.47   (f) ADJUSTED    1 2
 HV1937
 HV1937.Superseded values are not recommended for survey control.
 HV1937
 HV1937.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1937.See file dsdata.pdf to determine how the superseded data were derived.
 HV1937
 HV1937_MARKER: DD = SURVEY DISK
 HV1937_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1937_SP_SET: ABUTMENT
 HV1937_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1937
 HV1937  HISTORY     - Date     Condition        Report By
 HV1937  HISTORY     - UNK      MONUMENTED       PBPP
 HV1937  HISTORY     - 1926     GOOD             PBPP
 HV1937
 HV1937                          STATION DESCRIPTION
 HV1937
 HV1937'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1937'AT WASHINGTON.
 HV1937'AT WASHINGTON, IN ROCK CREEK PARK, AT THE PIERCE MILL BRIDGE OVER
 HV1937'ROCK CREEK, IN THE FACE OF THE EAST ABUTMENT, 2 FEET SOUTH OF THE
 HV1937'NORTH END OF THE ABUTMENT, AND 2.5 FEET ABOVE THE GROUND.  A
 HV1937'PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK, SET VERTICALLY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1938 ***********************************************************************
 HV1938  DESIGNATION -  RC 5 PBPP
 HV1938  PID         -  HV1938
 HV1938  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1938  COUNTRY     -  US
 HV1938  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1938
 HV1938                         *CURRENT SURVEY CONTROL
 HV1938  ______________________________________________________________________
 HV1938* NAD 83(1986) POSITION- 38 56 39.     (N) 077 03 00.     (W)   SCALED
 HV1938* NAVD 88 ORTHO HEIGHT -    22.88  (+/-2cm)       75.1   (feet) VERTCON3
 HV1938  ______________________________________________________________________
 HV1938  GEOID HEIGHT    -        -31.985 (meters)                     GEOID18
 HV1938  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1938
 HV1938.The horizontal coordinates were scaled from a map and have
 HV1938.an estimated accuracy of +/- 6 seconds.
 HV1938
 HV1938.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1938.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1938
 HV1938.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1938.GEOID18 height accuracy estimate available here.
 HV1938
 HV1938.The vertical order pertains to the NGVD 29 superseded value.
 HV1938
 HV1938.Click photographs - Photos may exist for this station.
 HV1938
 HV1938
 HV1938_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ223125(NAD 83)
 HV1938
 HV1938                          SUPERSEDED SURVEY CONTROL
 HV1938
 HV1938  NGVD 29 (11/26/84)   23.109  (m)           75.82   (f) ADJUSTED    1 2
 HV1938
 HV1938.Superseded values are not recommended for survey control.
 HV1938
 HV1938.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1938.See file dsdata.pdf to determine how the superseded data were derived.
 HV1938
 HV1938_MARKER: DD = SURVEY DISK
 HV1938_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1938_SP_SET: BRIDGE
 HV1938_STAMPING: RC 5
 HV1938_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1938
 HV1938  HISTORY     - Date     Condition        Report By
 HV1938  HISTORY     - UNK      MONUMENTED       PBPP
 HV1938  HISTORY     - 1926     GOOD             PBPP
 HV1938  HISTORY     - 1944     GOOD             CGS
 HV1938
 HV1938                          STATION DESCRIPTION
 HV1938
 HV1938'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1938'AT WASHINGTON.
 HV1938'AT WASHINGTON, IN ROCK CREEK PARK, ON BEACH DRIVE, AT THE JUNCTION
 HV1938'OF BROAD BRANCH ROAD NORTHWEST, AT THE NORTHEAST CORNER OF THE
 HV1938'BRIDGE OVER BROAD BRANCH, AND IN THE TOP OF THE CONCRETE GUARDRAIL.
 HV1938'A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED RC 5.
 HV1938
 HV1938                          STATION RECOVERY (1944)
 HV1938
 HV1938'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1938'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1939 ***********************************************************************
 HV1939  DESIGNATION -  RC 6 PBPP
 HV1939  PID         -  HV1939
 HV1939  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1939  COUNTRY     -  US
 HV1939  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1939
 HV1939                         *CURRENT SURVEY CONTROL
 HV1939  ______________________________________________________________________
 HV1939* NAD 83(1986) POSITION- 38 56 44.     (N) 077 02 47.     (W)   SCALED
 HV1939* NAVD 88 ORTHO HEIGHT -    21.65  (+/-2cm)       71.0   (feet) VERTCON3
 HV1939  ______________________________________________________________________
 HV1939  GEOID HEIGHT    -        -31.988 (meters)                     GEOID18
 HV1939  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1939
 HV1939.The horizontal coordinates were scaled from a map and have
 HV1939.an estimated accuracy of +/- 6 seconds.
 HV1939
 HV1939.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1939.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1939
 HV1939.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1939.GEOID18 height accuracy estimate available here.
 HV1939
 HV1939.The vertical order pertains to the NGVD 29 superseded value.
 HV1939
 HV1939.Click photographs - Photos may exist for this station.
 HV1939
 HV1939
 HV1939_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ226127(NAD 83)
 HV1939
 HV1939                          SUPERSEDED SURVEY CONTROL
 HV1939
 HV1939  NGVD 29 (11/26/84)   21.877  (m)           71.77   (f) ADJUSTED    1 2
 HV1939
 HV1939.Superseded values are not recommended for survey control.
 HV1939
 HV1939.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1939.See file dsdata.pdf to determine how the superseded data were derived.
 HV1939
 HV1939_MARKER: DD = SURVEY DISK
 HV1939_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1939_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1939+STABILITY: SURFACE MOTION
 HV1939
 HV1939  HISTORY     - Date     Condition        Report By
 HV1939  HISTORY     - UNK      MONUMENTED       PBPP
 HV1939  HISTORY     - 1926     GOOD             PBPP
 HV1939  HISTORY     - 1944     MARK NOT FOUND   CGS
 HV1939
 HV1939                          STATION DESCRIPTION
 HV1939
 HV1939'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1939'AT WASHINGTON.
 HV1939'AT WASHINGTON, IN ROCK CREEK PARK, ABOUT 1/4 MILE NORTH ALONG
 HV1939'BEACH DRIVE FROM THE BRIDGE OVER BROAD BRANCH, AT A BEND JUST
 HV1939'NORTH OF A SMALL WOODEN BRIDGE OVER ROCK CREEK, 14.4 FEET SOUTH
 HV1939'OF A SEWER MANHOLE, AND EAST OF BEACH DRIVE.  A PUBLIC BUILDINGS
 HV1939'AND PUBLIC PARKS STANDARD TRIANGULATION-STATION DISK, SET IN
 HV1939'THE TOP OF A CONCRETE POST.
 HV1939
 HV1939                          STATION RECOVERY (1944)
 HV1939
 HV1939'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1939'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1940 ***********************************************************************
 HV1940  DESIGNATION -  RC 7
 HV1940  PID         -  HV1940
 HV1940  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1940  COUNTRY     -  US
 HV1940  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1940
 HV1940                         *CURRENT SURVEY CONTROL
 HV1940  ______________________________________________________________________
 HV1940* NAD 83(1986) POSITION- 38 56 53.     (N) 077 02 42.     (W)   SCALED
 HV1940* NAVD 88 ORTHO HEIGHT -    25.71  (+/-2cm)       84.4   (feet) VERTCON3
 HV1940  ______________________________________________________________________
 HV1940  GEOID HEIGHT    -        -31.987 (meters)                     GEOID18
 HV1940  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1940
 HV1940.The horizontal coordinates were scaled from a map and have
 HV1940.an estimated accuracy of +/- 6 seconds.
 HV1940
 HV1940.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1940.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1940
 HV1940.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1940.GEOID18 height accuracy estimate available here.
 HV1940
 HV1940.The vertical order pertains to the NGVD 29 superseded value.
 HV1940
 HV1940.Click photographs - Photos may exist for this station.
 HV1940
 HV1940
 HV1940_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ227130(NAD 83)
 HV1940
 HV1940                          SUPERSEDED SURVEY CONTROL
 HV1940
 HV1940  NGVD 29 (11/26/84)   25.933  (m)           85.08   (f) ADJUSTED    1 2
 HV1940
 HV1940.Superseded values are not recommended for survey control.
 HV1940
 HV1940.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1940.See file dsdata.pdf to determine how the superseded data were derived.
 HV1940
 HV1940
 HV1940  HISTORY     - Date     Condition        Report By
 HV1940  HISTORY     - UNK      MONUMENTED       PBPP
 HV1940  HISTORY     - 1926     GOOD             PBPP
 HV1940  HISTORY     - 20201015 MARK NOT FOUND   NGS
 HV1940
 HV1940                          STATION DESCRIPTION
 HV1940
 HV1940'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1940'AT WASHINGTON.
 HV1940'AT WASHINGTON, IN ROCK CREEK PARK, 0.5 MILE NORTH ALONG BEACH DRIVE
 HV1940'FROM THE BRIDGE OVER BROAD BRANCH, 14 FEET FROM THE SOUTHWEST
 HV1940'CORNER OF BOULDER BRIDGE OVER ROCK CREEK, AND IN THE TOP OF A
 HV1940'ROCK LEDGE.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK.
 HV1940
 HV1940                          STATION RECOVERY (2020)
 HV1940
 HV1940'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JKH)
 HV1940'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1941 ***********************************************************************
 HV1941  DESIGNATION -  RC 8 PBPP
 HV1941  PID         -  HV1941
 HV1941  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1941  COUNTRY     -  US
 HV1941  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1941
 HV1941                         *CURRENT SURVEY CONTROL
 HV1941  ______________________________________________________________________
 HV1941* NAD 83(1986) POSITION- 38 57 11.     (N) 077 02 36.     (W)   SCALED
 HV1941* NAVD 88 ORTHO HEIGHT -    29.55  (+/-2cm)       96.9   (feet) VERTCON3
 HV1941  ______________________________________________________________________
 HV1941  GEOID HEIGHT    -        -31.983 (meters)                     GEOID18
 HV1941  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1941
 HV1941.The horizontal coordinates were scaled from a map and have
 HV1941.an estimated accuracy of +/- 6 seconds.
 HV1941
 HV1941.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1941.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1941
 HV1941.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1941.GEOID18 height accuracy estimate available here.
 HV1941
 HV1941.The vertical order pertains to the NGVD 29 superseded value.
 HV1941
 HV1941.Click photographs - Photos may exist for this station.
 HV1941
 HV1941
 HV1941_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ229135(NAD 83)
 HV1941
 HV1941                          SUPERSEDED SURVEY CONTROL
 HV1941
 HV1941  NGVD 29 (11/26/84)   29.773  (m)           97.68   (f) ADJUSTED    1 2
 HV1941
 HV1941.Superseded values are not recommended for survey control.
 HV1941
 HV1941.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1941.See file dsdata.pdf to determine how the superseded data were derived.
 HV1941
 HV1941_MARKER: DD = SURVEY DISK
 HV1941_SETTING: 80 = SET IN A BOULDER
 HV1941_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1941+STABILITY: SURFACE MOTION
 HV1941
 HV1941  HISTORY     - Date     Condition        Report By
 HV1941  HISTORY     - UNK      MONUMENTED       PBPP
 HV1941  HISTORY     - 1926     GOOD             PBPP
 HV1941
 HV1941                          STATION DESCRIPTION
 HV1941
 HV1941'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1941'AT WASHINGTON.
 HV1941'AT WASHINGTON, IN ROCK CREEK PARK, 0.6 MILE SOUTH ALONG BEACH
 HV1941'DRIVE FROM THE INTERSECTION OF MILITARY ROAD, 0.6 MILE NORTH OF
 HV1941'BOULDER BRIDGE OVER ROCK CREEK, 8 FEET FROM THE SOUTHEAST CORNER
 HV1941'OF A SMALL FOOTBRIDGE, AND IN THE TOP OF A LARGE BOULDER ON
 HV1941'THE EAST BANK OF ROCK CREEK.  A PUBLIC BUILDINGS AND PUBLIC
 HV1941'PARKS STANDARD DISK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1942 ***********************************************************************
 HV1942  DESIGNATION -  RC 9 PBPP
 HV1942  PID         -  HV1942
 HV1942  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1942  COUNTRY     -  US
 HV1942  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1942
 HV1942                         *CURRENT SURVEY CONTROL
 HV1942  ______________________________________________________________________
 HV1942* NAD 83(1986) POSITION- 38 57 41.     (N) 077 02 36.     (W)   SCALED
 HV1942* NAVD 88 ORTHO HEIGHT -    45.14  (+/-2cm)      148.1   (feet) VERTCON3
 HV1942  ______________________________________________________________________
 HV1942  GEOID HEIGHT    -        -31.975 (meters)                     GEOID18
 HV1942  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1942
 HV1942.The horizontal coordinates were scaled from a map and have
 HV1942.an estimated accuracy of +/- 6 seconds.
 HV1942
 HV1942.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1942.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1942
 HV1942.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1942.GEOID18 height accuracy estimate available here.
 HV1942
 HV1942.The vertical order pertains to the NGVD 29 superseded value.
 HV1942
 HV1942.Click photographs - Photos may exist for this station.
 HV1942
 HV1942
 HV1942_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ229144(NAD 83)
 HV1942
 HV1942                          SUPERSEDED SURVEY CONTROL
 HV1942
 HV1942  NGVD 29 (11/26/84)   45.362  (m)          148.83   (f) ADJUSTED    1 2
 HV1942
 HV1942.Superseded values are not recommended for survey control.
 HV1942
 HV1942.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1942.See file dsdata.pdf to determine how the superseded data were derived.
 HV1942
 HV1942_MARKER: DD = SURVEY DISK
 HV1942_SETTING: 80 = SET IN A BOULDER
 HV1942_STAMPING: RC 9
 HV1942_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1942+STABILITY: SURFACE MOTION
 HV1942
 HV1942  HISTORY     - Date     Condition        Report By
 HV1942  HISTORY     - UNK      MONUMENTED       PBPP
 HV1942  HISTORY     - 1926     GOOD             PBPP
 HV1942  HISTORY     - 1944     GOOD             CGS
 HV1942
 HV1942                          STATION DESCRIPTION
 HV1942
 HV1942'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1942'AT WASHINGTON.
 HV1942'AT WASHINGTON, IN ROCK CREEK PARK, AT THE INTERSECTION OF BEACH
 HV1942'DRIVE, MORROW DRIVE AND MILITARY ROAD, 15 YARDS SOUTH OF THE
 HV1942'CENTERLINE OF MILITARY ROAD, 9 FEET WEST OF THE WEST CURB OF
 HV1942'MORROW DRIVE, IN A RECESS OF A LARGE GRANITE BOULDER, AND ABOUT
 HV1942'2 FEET ABOVE THE GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS
 HV1942'STANDARD DISK, STAMPED RC-9.
 HV1942
 HV1942                          STATION RECOVERY (1944)
 HV1942
 HV1942'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1942'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1924 ***********************************************************************
 HV1924  DESIGNATION -  RCPP 10
 HV1924  PID         -  HV1924
 HV1924  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1924  COUNTRY     -  US
 HV1924  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1924
 HV1924                         *CURRENT SURVEY CONTROL
 HV1924  ______________________________________________________________________
 HV1924* NAD 83(1986) POSITION- 38 54 38.     (N) 077 03 04.     (W)   SCALED
 HV1924* NAVD 88 ORTHO HEIGHT -     9.72  (+/-2cm)       31.9   (feet) VERTCON3
 HV1924  ______________________________________________________________________
 HV1924  GEOID HEIGHT    -        -32.030 (meters)                     GEOID18
 HV1924  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1924
 HV1924.The horizontal coordinates were scaled from a map and have
 HV1924.an estimated accuracy of +/- 6 seconds.
 HV1924
 HV1924.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1924.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1924
 HV1924.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1924.GEOID18 height accuracy estimate available here.
 HV1924
 HV1924.The vertical order pertains to the NGVD 29 superseded value.
 HV1924
 HV1924.Click photographs - Photos may exist for this station.
 HV1924
 HV1924
 HV1924_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ221088(NAD 83)
 HV1924
 HV1924                          SUPERSEDED SURVEY CONTROL
 HV1924
 HV1924  NGVD 29 (11/26/84)    9.956  (m)           32.66   (f) ADJUSTED    1 2
 HV1924
 HV1924.Superseded values are not recommended for survey control.
 HV1924
 HV1924.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1924.See file dsdata.pdf to determine how the superseded data were derived.
 HV1924
 HV1924_MARKER: DD = SURVEY DISK
 HV1924_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1924_SP_SET: BRIDGE
 HV1924_MARK LOGO: PBPP
 HV1924_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1924
 HV1924  HISTORY     - Date     Condition        Report By
 HV1924  HISTORY     - UNK      MONUMENTED       PBPP
 HV1924  HISTORY     - 1926     GOOD             PBPP
 HV1924  HISTORY     - 1944     MARK NOT FOUND   CGS
 HV1924
 HV1924                          STATION DESCRIPTION
 HV1924
 HV1924'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1924'AT WASHINGTON.
 HV1924'AT WASHINGTON, AT THE Q STREET BRIDGE OVER THE ROCK CREEK
 HV1924'AND POTOMAC PARK PARKWAY, AT THE EAST ABUTMENT (WHERE THE BRIDLE
 HV1924'PATH PASSES UNDER THE BRIDGE), AND IN THE COPING AT THE SOUTHEAST
 HV1924'CORNER.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK.
 HV1924
 HV1924                          STATION RECOVERY (1944)
 HV1924
 HV1924'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1924'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1925 ***********************************************************************
 HV1925  DESIGNATION -  RCPP 11
 HV1925  PID         -  HV1925
 HV1925  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1925  COUNTRY     -  US
 HV1925  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1925
 HV1925                         *CURRENT SURVEY CONTROL
 HV1925  ______________________________________________________________________
 HV1925* NAD 83(1986) POSITION- 38 54 40.2    (N) 077 03 03.3    (W)   HD_HELD2
 HV1925* NAVD 88 ORTHO HEIGHT -    22.82  (+/-2cm)       74.9   (feet) VERTCON3
 HV1925  ______________________________________________________________________
 HV1925  GEOID HEIGHT    -        -32.029 (meters)                     GEOID18
 HV1925  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1925
 HV1925.The horizontal coordinates were established by autonomous hand held GPS
 HV1925.observations and have an estimated accuracy of +/- 10 meters.
 HV1925
 HV1925.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1925.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1925
 HV1925.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1925.GEOID18 height accuracy estimate available here.
 HV1925
 HV1925.The vertical order pertains to the NGVD 29 superseded value.
 HV1925
 HV1925.Click photographs - Photos may exist for this station.
 HV1925
 HV1925
 HV1925_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2217708918(NAD 83)
 HV1925
 HV1925                          SUPERSEDED SURVEY CONTROL
 HV1925
 HV1925  NGVD 29 (11/26/84)   23.056  (m)           75.64   (f) ADJUSTED    1 2
 HV1925
 HV1925.Superseded values are not recommended for survey control.
 HV1925
 HV1925.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1925.See file dsdata.pdf to determine how the superseded data were derived.
 HV1925
 HV1925_MARKER: DD = SURVEY DISK
 HV1925_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1925_SP_SET: BRIDGE
 HV1925_STAMPING: RCP 11
 HV1925_MARK LOGO: PBPP
 HV1925_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1925_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1925+SATELLITE: SATELLITE OBSERVATIONS - December 29, 2024
 HV1925
 HV1925  HISTORY     - Date     Condition        Report By
 HV1925  HISTORY     - UNK      MONUMENTED       PBPP
 HV1925  HISTORY     - 1926     GOOD             PBPP
 HV1925  HISTORY     - 1944     GOOD             CGS
 HV1925  HISTORY     - 20020813 GOOD             INDIV
 HV1925  HISTORY     - 20060308 GOOD             GEOCAC
 HV1925  HISTORY     - 20241229 GOOD             INDIV
 HV1925
 HV1925                          STATION DESCRIPTION
 HV1925
 HV1925'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1925'AT WASHINGTON.
 HV1925'AT WASHINGTON, AT THE EAST END OF THE Q STREET BRIDGE OVER THE
 HV1925'ROCK CREEK AND POTOMAC PARK PARKWAY, IN THE TOP OF THE NORTH WING
 HV1925'WALL, AND 5.5 FEET NORTH OF THE BASE OF THE BRONZE BUFFALO.
 HV1925'A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED RCP 11.
 HV1925
 HV1925                          STATION RECOVERY (1944)
 HV1925
 HV1925'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1925'RECOVERED IN GOOD CONDITION.
 HV1925
 HV1925                          STATION RECOVERY (2002)
 HV1925
 HV1925'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 HV1925'RECOVERED IN GOOD CONDITION.
 HV1925
 HV1925                          STATION RECOVERY (2006)
 HV1925
 HV1925'RECOVERY NOTE BY GEOCACHING 2006 (WD)
 HV1925'RECOVERED IN GOOD CONDITION.
 HV1925
 HV1925                          STATION RECOVERY (2024)
 HV1925
 HV1925'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2024 (EF)
 HV1925'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1926 ***********************************************************************
 HV1926  DESIGNATION -  RCPP 12
 HV1926  PID         -  HV1926
 HV1926  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1926  COUNTRY     -  US
 HV1926  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1926
 HV1926                         *CURRENT SURVEY CONTROL
 HV1926  ______________________________________________________________________
 HV1926* NAD 83(1986) POSITION- 38 54 46.4    (N) 077 03 35.4    (W)   HD_HELD2
 HV1926* NAVD 88 ORTHO HEIGHT -    51.21  (+/-2cm)      168.0   (feet) VERTCON3
 HV1926  ______________________________________________________________________
 HV1926  GEOID HEIGHT    -        -32.014 (meters)                     GEOID18
 HV1926  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1926
 HV1926.The horizontal coordinates were established by autonomous hand held GPS
 HV1926.observations and have an estimated accuracy of +/- 10 meters.
 HV1926
 HV1926.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1926.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1926
 HV1926.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1926.GEOID18 height accuracy estimate available here.
 HV1926
 HV1926.The vertical order pertains to the NGVD 29 superseded value.
 HV1926
 HV1926.Click photographs - Photos may exist for this station.
 HV1926
 HV1926
 HV1926_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2140809126(NAD 83)
 HV1926
 HV1926                          SUPERSEDED SURVEY CONTROL
 HV1926
 HV1926  NGVD 29 (11/26/84)   51.442  (m)          168.77   (f) ADJUSTED    1 2
 HV1926
 HV1926.Superseded values are not recommended for survey control.
 HV1926
 HV1926.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1926.See file dsdata.pdf to determine how the superseded data were derived.
 HV1926
 HV1926_MARKER: DB = BENCH MARK DISK
 HV1926_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1926_SP_SET: BUILDING
 HV1926_STAMPING: RCP 12
 HV1926_MARK LOGO: PBPP
 HV1926_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1926
 HV1926  HISTORY     - Date     Condition        Report By
 HV1926  HISTORY     - UNK      MONUMENTED       PBPP
 HV1926  HISTORY     - 1926     GOOD             PBPP
 HV1926  HISTORY     - 1944     GOOD             CGS
 HV1926  HISTORY     - 20050522 GOOD             GEOCAC
 HV1926  HISTORY     - 20181225 GOOD             GEOCAC
 HV1926
 HV1926                          STATION DESCRIPTION
 HV1926
 HV1926'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1926'AT WASHINGTON.
 HV1926'AT WASHINGTON, OPPOSITE THE HOUSE AT 3018-1/2 R STREET NORTHWEST,
 HV1926'IN THE SOUTHEAST CORNER OF MONTROSE PARK, AT THE LODGE, IN THE
 HV1926'WEST BRICK WALL, 2 FEET NORTH OF THE MAIN ENTRANCE, AND ABOUT
 HV1926'1-1/2 FEET ABOVE THE SIDEWALK.  A PUBLIC BUILDINGS AND PUBLIC
 HV1926'PARKS STANDARD DISK, STAMPED RCP 12 AND SET VERTICALLY.
 HV1926
 HV1926                          STATION RECOVERY (1944)
 HV1926
 HV1926'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1926'RECOVERED IN GOOD CONDITION.
 HV1926
 HV1926                          STATION RECOVERY (2005)
 HV1926
 HV1926'RECOVERY NOTE BY GEOCACHING 2005 (APC)
 HV1926'RECOVERED IN GOOD CONDITION.
 HV1926
 HV1926                          STATION RECOVERY (2018)
 HV1926
 HV1926'RECOVERY NOTE BY GEOCACHING 2018 (APC)
 HV1926'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1927 ***********************************************************************
 HV1927  DESIGNATION -  RCPP 13 PBPP
 HV1927  PID         -  HV1927
 HV1927  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1927  COUNTRY     -  US
 HV1927  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1927
 HV1927                         *CURRENT SURVEY CONTROL
 HV1927  ______________________________________________________________________
 HV1927* NAD 83(1986) POSITION- 38 54 57.     (N) 077 03 36.     (W)   SCALED
 HV1927* NAVD 88 ORTHO HEIGHT -    30.66  (+/-2cm)      100.6   (feet) VERTCON3
 HV1927  ______________________________________________________________________
 HV1927  GEOID HEIGHT    -        -32.009 (meters)                     GEOID18
 HV1927  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1927
 HV1927.The horizontal coordinates were scaled from a map and have
 HV1927.an estimated accuracy of +/- 6 seconds.
 HV1927
 HV1927.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1927.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1927
 HV1927.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1927.GEOID18 height accuracy estimate available here.
 HV1927
 HV1927.The vertical order pertains to the NGVD 29 superseded value.
 HV1927
 HV1927.Click photographs - Photos may exist for this station.
 HV1927
 HV1927
 HV1927_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ214094(NAD 83)
 HV1927
 HV1927                          SUPERSEDED SURVEY CONTROL
 HV1927
 HV1927  NGVD 29 (11/26/84)   30.887  (m)          101.34   (f) ADJUSTED    1 2
 HV1927
 HV1927.Superseded values are not recommended for survey control.
 HV1927
 HV1927.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1927.See file dsdata.pdf to determine how the superseded data were derived.
 HV1927
 HV1927_MARKER: DD = SURVEY DISK
 HV1927_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1927_SP_SET: CONCRETE BASE
 HV1927_STAMPING: RCP 13
 HV1927_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1927
 HV1927  HISTORY     - Date     Condition        Report By
 HV1927  HISTORY     - UNK      MONUMENTED       PBPP
 HV1927  HISTORY     - 1926     GOOD             PBPP
 HV1927  HISTORY     - 1944     GOOD             CGS
 HV1927  HISTORY     - 20090329 GOOD             GEOCAC
 HV1927
 HV1927                          STATION DESCRIPTION
 HV1927
 HV1927'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1927'AT WASHINGTON.
 HV1927'AT WASHINGTON, ON THE EAST SIDE OF DUMBARTON OAKS PARK (THE FORMER
 HV1927'BLISS ESTATE), IN THE CONCRETE, BASE OF THE STONE RETAINING WALL
 HV1927'ALONG THE WEST SIDE OF LOVERS LANE, IN THE ONLY PART OF THE BASE
 HV1927'THAT SHOWS ABOVE GROUND, 100 FEET SOUTH ALONG THE CURVE IN THE
 HV1927'WALL FROM THE NORTH END OF THE WALL, AT A BULGE IN THE WALL, AND
 HV1927'NEAR THE LEVEL OF THE GROUND.  A PUBLIC BUILDINGS AND PUBLIC
 HV1927'PARKS STANDARD DISK, STAMPED RCP 13 AND SET VERTICALLY.
 HV1927
 HV1927                          STATION RECOVERY (1944)
 HV1927
 HV1927'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1927'RECOVERED IN GOOD CONDITION.
 HV1927
 HV1927                          STATION RECOVERY (2009)
 HV1927
 HV1927'RECOVERY NOTE BY GEOCACHING 2009 (APC)
 HV1927'LOCATION IS AT THE REAR OF DUMBARTON OAKS ADJACENT TO MONTROSE PARK.
 HV1927'THE CONCRETE FOUNDATION WHERE THE DISK IS MOUNTED IS CRACKED, AND THE
 HV1927'TWO PIECES OFFSET, SO THE MARK MAY HAVE SHIFTED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1928 ***********************************************************************
 HV1928  DESIGNATION -  RCPP 14 PBPP
 HV1928  PID         -  HV1928
 HV1928  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1928  COUNTRY     -  US
 HV1928  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1928
 HV1928                         *CURRENT SURVEY CONTROL
 HV1928  ______________________________________________________________________
 HV1928* NAD 83(1986) POSITION- 38 54 57.     (N) 077 03 30.     (W)   SCALED
 HV1928* NAVD 88 ORTHO HEIGHT -     5.93  (+/-2cm)       19.5   (feet) VERTCON3
 HV1928  ______________________________________________________________________
 HV1928  GEOID HEIGHT    -        -32.011 (meters)                     GEOID18
 HV1928  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1928
 HV1928.The horizontal coordinates were scaled from a map and have
 HV1928.an estimated accuracy of +/- 6 seconds.
 HV1928
 HV1928.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1928.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1928
 HV1928.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1928.GEOID18 height accuracy estimate available here.
 HV1928
 HV1928.The vertical order pertains to the NGVD 29 superseded value.
 HV1928
 HV1928.Click photographs - Photos may exist for this station.
 HV1928
 HV1928
 HV1928_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ215094(NAD 83)
 HV1928
 HV1928                          SUPERSEDED SURVEY CONTROL
 HV1928
 HV1928  NGVD 29 (11/26/84)    6.162  (m)           20.22   (f) ADJUSTED    1 2
 HV1928
 HV1928.Superseded values are not recommended for survey control.
 HV1928
 HV1928.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1928.See file dsdata.pdf to determine how the superseded data were derived.
 HV1928
 HV1928_MARKER: DD = SURVEY DISK
 HV1928_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1928_SP_SET: RETAINING WALL
 HV1928_STAMPING: RCP 14
 HV1928_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1928
 HV1928  HISTORY     - Date     Condition        Report By
 HV1928  HISTORY     - UNK      MONUMENTED       PBPP
 HV1928  HISTORY     - 1926     GOOD             PBPP
 HV1928  HISTORY     - 1944     GOOD             CGS
 HV1928
 HV1928                          STATION DESCRIPTION
 HV1928
 HV1928'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1928'AT WASHINGTON.
 HV1928'AT WASHINGTON, ON THE ROCK CREEK AND POTOMAC PARK PARKWAY, 200
 HV1928'YARDS SOUTHWEST OF THE MASSACHUSETTS AVENUE BRIDGE, 200 FEET
 HV1928'SOUTHWEST OF THE SOUTH CORNER OF A STONE BUILDING (A PUMPING
 HV1928'STATION) EAST OF THE PARKWAY, 100 FEET WEST OF THE WEST CURB OF
 HV1928'THE WEST LANE OF THE PARKWAY, AT A DAM ON ROCK CREEK, IN THE
 HV1928'TOP OF THE CONCRETE RETAINING WALL, 11.5 FEET SOUTHWEST OF THE
 HV1928'STEPS LEADING TO THE EAST END OF THE DAM, AND ABOUT 3 FEET ABOVE
 HV1928'THE GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK,
 HV1928'STAMPED RCP 14.
 HV1928
 HV1928                          STATION RECOVERY (1944)
 HV1928
 HV1928'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1928'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1929 ***********************************************************************
 HV1929  DESIGNATION -  RCPP 16 PBPP
 HV1929  PID         -  HV1929
 HV1929  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1929  COUNTRY     -  US
 HV1929  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1929
 HV1929                         *CURRENT SURVEY CONTROL
 HV1929  ______________________________________________________________________
 HV1929* NAD 83(1986) POSITION- 38 55 06.     (N) 077 03 32.     (W)   SCALED
 HV1929* NAVD 88 ORTHO HEIGHT -    36.856 (meters)      120.92  (feet) ADJUSTED
 HV1929  ______________________________________________________________________
 HV1929  GEOID HEIGHT    -        -32.006 (meters)                     GEOID18
 HV1929  DYNAMIC HEIGHT  -         36.837 (meters)      120.86  (feet) COMP
 HV1929  MODELED GRAVITY -    980,090.8   (mgal)                       NAVD 88
 HV1929
 HV1929  VERT ORDER      -  FIRST     CLASS II
 HV1929
 HV1929.The horizontal coordinates were scaled from a map and have
 HV1929.an estimated accuracy of +/- 6 seconds.
 HV1929
 HV1929.The orthometric height was determined by differential leveling and
 HV1929.adjusted by the NATIONAL GEODETIC SURVEY
 HV1929.in June 1991.
 HV1929
 HV1929.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1929.GEOID18 height accuracy estimate available here.
 HV1929
 HV1929.Click photographs - Photos may exist for this station.
 HV1929
 HV1929.The dynamic height is computed by dividing the NAVD 88
 HV1929.geopotential number by the normal gravity value computed on the
 HV1929.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1929.degrees latitude (g = 980.6199 gals.).
 HV1929
 HV1929.The modeled gravity was interpolated from observed gravity values.
 HV1929
 HV1929
 HV1929_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ215097(NAD 83)
 HV1929
 HV1929                          SUPERSEDED SURVEY CONTROL
 HV1929
 HV1929  NGVD 29 (11/26/84)   37.092  (m)          121.69   (f) ADJUSTED    1 2
 HV1929
 HV1929.Superseded values are not recommended for survey control.
 HV1929
 HV1929.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1929.See file dsdata.pdf to determine how the superseded data were derived.
 HV1929
 HV1929_MARKER: DD = SURVEY DISK
 HV1929_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1929_SP_SET: BUILDING FOUNDATION
 HV1929_STAMPING: RCP 16
 HV1929_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1929
 HV1929  HISTORY     - Date     Condition        Report By
 HV1929  HISTORY     - UNK      MONUMENTED       PBPP
 HV1929  HISTORY     - 1926     GOOD             PBPP
 HV1929  HISTORY     - 1944     GOOD             CGS
 HV1929
 HV1929                          STATION DESCRIPTION
 HV1929
 HV1929'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1929'AT WASHINGTON.
 HV1929'AT WASHINGTON, AT THE INTERSECTION OF MASSACHUSETTS AVENUE AND
 HV1929'ROCK CREEK DRIVE NORTHWEST, AT THE HOUSE AT 2929 MASSACHUSETTS
 HV1929'AVENUE (ONCE OCCUPIED BY THE HUNGARIAN LEGATION, BUT OCCUPIED
 HV1929'IN 1944 BY THE FRENCH LEGATION), IN THE SOUTHEAST CONCRETE FOUNDATION
 HV1929'WALL, 7.5 FEET NORTHEAST OF THE SOUTH CORNER OF THE HOUSE, BELOW
 HV1929'THE NORTHEAST EDGE OF AN IRON COAL-CHUTE WINDOW, AND ABOUT 1-1/2
 HV1929'FEET ABOVE THE GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS
 HV1929'STANDARD DISK, STAMPED RCP 16 AND SET VERTICALLY.
 HV1929
 HV1929                          STATION RECOVERY (1944)
 HV1929
 HV1929'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1929'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1930 ***********************************************************************
 HV1930  DESIGNATION -  RCPP 17 PBPP
 HV1930  PID         -  HV1930
 HV1930  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1930  COUNTRY     -  US
 HV1930  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1930
 HV1930                         *CURRENT SURVEY CONTROL
 HV1930  ______________________________________________________________________
 HV1930* NAD 83(1986) POSITION- 38 55 18.     (N) 077 03 09.     (W)   SCALED
 HV1930* NAVD 88 ORTHO HEIGHT -    32.15  (+/-2cm)      105.5   (feet) VERTCON3
 HV1930  ______________________________________________________________________
 HV1930  GEOID HEIGHT    -        -32.010 (meters)                     GEOID18
 HV1930  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1930
 HV1930.The horizontal coordinates were scaled from a map and have
 HV1930.an estimated accuracy of +/- 6 seconds.
 HV1930
 HV1930.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1930.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1930
 HV1930.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1930.GEOID18 height accuracy estimate available here.
 HV1930
 HV1930.The vertical order pertains to the NGVD 29 superseded value.
 HV1930
 HV1930.Click photographs - Photos may exist for this station.
 HV1930
 HV1930
 HV1930_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ220100(NAD 83)
 HV1930
 HV1930                          SUPERSEDED SURVEY CONTROL
 HV1930
 HV1930  NGVD 29 (11/26/84)   32.383  (m)          106.24   (f) ADJUSTED    1 2
 HV1930
 HV1930.Superseded values are not recommended for survey control.
 HV1930
 HV1930.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1930.See file dsdata.pdf to determine how the superseded data were derived.
 HV1930
 HV1930_MARKER: DD = SURVEY DISK
 HV1930_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1930_SP_SET: STONE TOWER
 HV1930_STAMPING: RCP 17
 HV1930_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1930
 HV1930  HISTORY     - Date     Condition        Report By
 HV1930  HISTORY     - UNK      MONUMENTED       PBPP
 HV1930  HISTORY     - 1926     GOOD             PBPP
 HV1930  HISTORY     - 1944     GOOD             CGS
 HV1930  HISTORY     - 20081204 MARK NOT FOUND   AMTHOM
 HV1930
 HV1930                          STATION DESCRIPTION
 HV1930
 HV1930'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1930'AT WASHINGTON.
 HV1930'AT WASHINGTON, ON THE ROCK CREEK AND POTOMAC PARK PARKWAY, DUE
 HV1930'WEST OF THE NORTH END OF THE CONNECTICUT AVENUE BRIDGE, AT THE
 HV1930'FORMER WARDMAN PARK SADDLE CLUB (USED IN 1944 BY THE SHOREHAM
 HV1930'HOTEL FOR RAISING CHICKENS), 60 FEET EAST OF THE ENTRANCE FACING
 HV1930'ROCK CREEK, IN THE SOUTH FACE OF THE STONE TOWER, 1 FOOT EAST OF
 HV1930'THE SOUTHWEST CORNER OF THE TOWER, AND ABOUT 1 FOOT ABOVE THE
 HV1930'GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED
 HV1930'RCP 17 AND SET VERTICALLY.
 HV1930
 HV1930                          STATION RECOVERY (1944)
 HV1930
 HV1930'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1930'RECOVERED IN GOOD CONDITION.
 HV1930
 HV1930                          STATION RECOVERY (2008)
 HV1930
 HV1930'RECOVERY NOTE BY A MORTON THOMAS AND ASSOCIATES 2008 (JAN)
 HV1930'STONE TOWER NO LONGER EXISTS
 HV1930'PADDOCK FOR RAISING CHICKENS NOT FOUND
 HV1930'EXTENSIVE LANDSCAPING SINCE 1944
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1932 ***********************************************************************
 HV1932  DESIGNATION -  RCPP 18 PBPP
 HV1932  PID         -  HV1932
 HV1932  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1932  COUNTRY     -  US
 HV1932  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1932
 HV1932                         *CURRENT SURVEY CONTROL
 HV1932  ______________________________________________________________________
 HV1932* NAD 83(1986) POSITION- 38 55 16.     (N) 077 03 00.     (W)   SCALED
 HV1932* NAVD 88 ORTHO HEIGHT -     9.08  (+/-2cm)       29.8   (feet) VERTCON3
 HV1932  ______________________________________________________________________
 HV1932  GEOID HEIGHT    -        -32.014 (meters)                     GEOID18
 HV1932  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1932
 HV1932.The horizontal coordinates were scaled from a map and have
 HV1932.an estimated accuracy of +/- 6 seconds.
 HV1932
 HV1932.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1932.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1932
 HV1932.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1932.GEOID18 height accuracy estimate available here.
 HV1932
 HV1932.The vertical order pertains to the NGVD 29 superseded value.
 HV1932
 HV1932.Click photographs - Photos may exist for this station.
 HV1932
 HV1932
 HV1932_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ222100(NAD 83)
 HV1932
 HV1932                          SUPERSEDED SURVEY CONTROL
 HV1932
 HV1932  NGVD 29 (11/26/84)    9.305  (m)           30.53   (f) ADJUSTED    1 2
 HV1932
 HV1932.Superseded values are not recommended for survey control.
 HV1932
 HV1932.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1932.See file dsdata.pdf to determine how the superseded data were derived.
 HV1932
 HV1932_MARKER: DD = SURVEY DISK
 HV1932_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1932_SP_SET: PIER
 HV1932_STAMPING: RCP 18
 HV1932_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1932_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1932+SATELLITE: SATELLITE OBSERVATIONS - October 24, 2002
 HV1932
 HV1932  HISTORY     - Date     Condition        Report By
 HV1932  HISTORY     - UNK      MONUMENTED       PBPP
 HV1932  HISTORY     - 1926     GOOD             PBPP
 HV1932  HISTORY     - 1944     GOOD             CGS
 HV1932  HISTORY     - 20021024 GOOD             INDIV
 HV1932  HISTORY     - 20081204 MARK NOT FOUND   AMTHOM
 HV1932
 HV1932                          STATION DESCRIPTION
 HV1932
 HV1932'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1932'AT WASHINGTON.
 HV1932'AT WASHINGTON, AT THE CONNECTICUT AVENUE BRIDGE OVER THE ROCK
 HV1932'CREEK AND POTOMAC PARK PARKWAY, 120 FEET BELOW THE BRIDGE FLOOR,
 HV1932'IN THE WEST FACE OF THE PIER ON THE EAST BANK OF ROCK CREEK, 11.5
 HV1932'FEET SOUTH OF THE NORTH END OF THE PIER, AND ABOUT 16 INCHES ABOVE
 HV1932'THE GROUND.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK,
 HV1932'STAMPED RCP 18 AND SET VERTICALLY.
 HV1932
 HV1932                          STATION RECOVERY (1944)
 HV1932
 HV1932'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1932'RECOVERED IN GOOD CONDITION.
 HV1932
 HV1932                          STATION RECOVERY (2002)
 HV1932
 HV1932'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 HV1932'ACCESS TO STATION IS VIA PARK POLICE TRAINING CENTER - EDGEWATER
 HV1932'STABLE, BEHIND FUEL PUMPS
 HV1932
 HV1932                          STATION RECOVERY (2008)
 HV1932
 HV1932'RECOVERY NOTE BY A MORTON THOMAS AND ASSOCIATES 2008 (JAN)
 HV1932'NO STEM OR MARK OF DISK EVIDENT
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1931 ***********************************************************************
 HV1931  DESIGNATION -  RCPP 20 PBPP
 HV1931  PID         -  HV1931
 HV1931  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1931  COUNTRY     -  US
 HV1931  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1931
 HV1931                         *CURRENT SURVEY CONTROL
 HV1931  ______________________________________________________________________
 HV1931* NAD 83(1986) POSITION- 38 55 22.     (N) 077 03 04.     (W)   SCALED
 HV1931* NAVD 88 ORTHO HEIGHT -    45.73  (+/-2cm)      150.0   (feet) VERTCON3
 HV1931  ______________________________________________________________________
 HV1931  GEOID HEIGHT    -        -32.010 (meters)                     GEOID18
 HV1931  VERT ORDER      -  SECOND    CLASS I (See Below)
 HV1931
 HV1931.The horizontal coordinates were scaled from a map and have
 HV1931.an estimated accuracy of +/- 6 seconds.
 HV1931
 HV1931.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1931.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1931
 HV1931.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1931.GEOID18 height accuracy estimate available here.
 HV1931
 HV1931.The vertical order pertains to the NGVD 29 superseded value.
 HV1931
 HV1931.Click photographs - Photos may exist for this station.
 HV1931
 HV1931
 HV1931_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ221102(NAD 83)
 HV1931
 HV1931                          SUPERSEDED SURVEY CONTROL
 HV1931
 HV1931  NGVD 29 (11/26/84)   45.957  (m)          150.78   (f) ADJUSTED    2 1
 HV1931
 HV1931.Superseded values are not recommended for survey control.
 HV1931
 HV1931.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1931.See file dsdata.pdf to determine how the superseded data were derived.
 HV1931
 HV1931_MARKER: DD = SURVEY DISK
 HV1931_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1931_SP_SET: PYLON BASE
 HV1931_STAMPING: RCP 20
 HV1931_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1931
 HV1931  HISTORY     - Date     Condition        Report By
 HV1931  HISTORY     - UNK      MONUMENTED       PBPP
 HV1931  HISTORY     - 1926     GOOD             PBPP
 HV1931  HISTORY     - 1944     GOOD             CGS
 HV1931  HISTORY     - 20081204 MARK NOT FOUND   AMTHOM
 HV1931  HISTORY     - 20090319 GOOD             GEOCAC
 HV1931
 HV1931                          STATION DESCRIPTION
 HV1931
 HV1931'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1931'AT WASHINGTON.
 HV1931'AT WASHINGTON, AT THE NORTHWEST CORNER OF THE CONNECTICUT AVENUE
 HV1931'BRIDGE OVER THE ROCK CREEK AND POTOMAC PARK PARKWAY, IN THE BASE
 HV1931'OF THE NORTHWEST PYLON, IN THE NORTH FACE, 5 INCHES WEST OF THE
 HV1931'NORTHEAST CORNER, AND ABOUT 5 INCHES ABOVE THE SIDEWALK.  A
 HV1931'PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED RCP 20
 HV1931'AND SET VERTICALLY.
 HV1931
 HV1931                          STATION RECOVERY (1944)
 HV1931
 HV1931'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1931'RECOVERED IN GOOD CONDITION.
 HV1931
 HV1931                          STATION RECOVERY (2008)
 HV1931
 HV1931'RECOVERY NOTE BY A MORTON THOMAS AND ASSOCIATES 2008 (JAN)
 HV1931'NO SIGN OF STEM OR DISK
 HV1931'STONE FACING CLEANED OR NEW
 HV1931
 HV1931                          STATION RECOVERY (2009)
 HV1931
 HV1931'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV1931'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1920 ***********************************************************************
 HV1920  DESIGNATION -  RCPP 5
 HV1920  PID         -  HV1920
 HV1920  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1920  COUNTRY     -  US
 HV1920  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1920
 HV1920                         *CURRENT SURVEY CONTROL
 HV1920  ______________________________________________________________________
 HV1920* NAD 83(1986) POSITION- 38 54 14.     (N) 077 03 11.     (W)   SCALED
 HV1920* NAVD 88 ORTHO HEIGHT -    14.16  (+/-2cm)       46.5   (feet) VERTCON3
 HV1920  ______________________________________________________________________
 HV1920  GEOID HEIGHT    -        -32.039 (meters)                     GEOID18
 HV1920  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1920
 HV1920.The horizontal coordinates were scaled from a map and have
 HV1920.an estimated accuracy of +/- 6 seconds.
 HV1920
 HV1920.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1920.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1920
 HV1920.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1920.GEOID18 height accuracy estimate available here.
 HV1920
 HV1920.The vertical order pertains to the NGVD 29 superseded value.
 HV1920
 HV1920.Click photographs - Photos may exist for this station.
 HV1920
 HV1920
 HV1920_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ219081(NAD 83)
 HV1920
 HV1920                          SUPERSEDED SURVEY CONTROL
 HV1920
 HV1920  NGVD 29 (11/26/84)   14.395  (m)           47.23   (f) ADJUSTED    1 2
 HV1920
 HV1920.Superseded values are not recommended for survey control.
 HV1920
 HV1920.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1920.See file dsdata.pdf to determine how the superseded data were derived.
 HV1920
 HV1920_MARKER: DD = SURVEY DISK
 HV1920_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
 HV1920_SP_SET: SILL
 HV1920_STAMPING: RCP 5
 HV1920_MARK LOGO: PBPP
 HV1920_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1920+STABILITY: SURFACE MOTION
 HV1920
 HV1920  HISTORY     - Date     Condition        Report By
 HV1920  HISTORY     - UNK      MONUMENTED       PBPP
 HV1920  HISTORY     - 1926     GOOD             PBPP
 HV1920  HISTORY     - 1944     GOOD             CGS
 HV1920
 HV1920                          STATION DESCRIPTION
 HV1920
 HV1920'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1920'AT WASHINGTON.
 HV1920'AT WASHINGTON, AT THE INTERSECTION OF PENNSYLVANIA AVENUE
 HV1920'AND TWENTY-SIXTH STREET NORTHWEST, AT THE CHESTNUT FARMS DAIRY,
 HV1920'AT A MILK-DELIVERY PLATFORM ON TWENTY-SIXTH STREET, 37.7 FEET
 HV1920'SOUTH OF THE NORTHWEST CORNER OF THE BUILDING, IN THE TOP OF
 HV1920'THE CONCRETE SILL, AND LEVEL WITH THE SIDEWALK.  A PUBLIC
 HV1920'BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED RCP 5.
 HV1920'NOTE-- THE LOCATION DESCRIBED IN NOW WALLED UP ABOUT 10 FEET
 HV1920'EAST OF THE BUILDING LINE, AND THREE ROLLER CHUTES FOR DELIVERING
 HV1920'CASES OF MILK BOTTLES COME THROUGH THE WALL.
 HV1920
 HV1920                          STATION RECOVERY (1944)
 HV1920
 HV1920'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1920'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1921 ***********************************************************************
 HV1921  DESIGNATION -  RCPP 6
 HV1921  PID         -  HV1921
 HV1921  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1921  COUNTRY     -  US
 HV1921  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1921
 HV1921                         *CURRENT SURVEY CONTROL
 HV1921  ______________________________________________________________________
 HV1921* NAD 83(1986) POSITION- 38 54 18.     (N) 077 03 25.     (W)   SCALED
 HV1921* NAVD 88 ORTHO HEIGHT -    14.27  (+/-2cm)       46.8   (feet) VERTCON3
 HV1921  ______________________________________________________________________
 HV1921  GEOID HEIGHT    -        -32.033 (meters)                     GEOID18
 HV1921  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1921
 HV1921.The horizontal coordinates were scaled from a map and have
 HV1921.an estimated accuracy of +/- 6 seconds.
 HV1921
 HV1921.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1921.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1921
 HV1921.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1921.GEOID18 height accuracy estimate available here.
 HV1921
 HV1921.The vertical order pertains to the NGVD 29 superseded value.
 HV1921
 HV1921.Click photographs - Photos may exist for this station.
 HV1921
 HV1921
 HV1921_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ216082(NAD 83)
 HV1921
 HV1921                          SUPERSEDED SURVEY CONTROL
 HV1921
 HV1921  NGVD 29 (11/26/84)   14.504  (m)           47.59   (f) ADJUSTED    1 2
 HV1921
 HV1921.Superseded values are not recommended for survey control.
 HV1921
 HV1921.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1921.See file dsdata.pdf to determine how the superseded data were derived.
 HV1921
 HV1921_MARKER: DD = SURVEY DISK
 HV1921_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1921_SP_SET: BUILDING
 HV1921_STAMPING: RCP 6
 HV1921_MARK LOGO: PBPP
 HV1921_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1921_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1921+SATELLITE: SATELLITE OBSERVATIONS - October 15, 2020
 HV1921
 HV1921  HISTORY     - Date     Condition        Report By
 HV1921  HISTORY     - UNK      MONUMENTED       PBPP
 HV1921  HISTORY     - 1926     GOOD             PBPP
 HV1921  HISTORY     - 1944     GOOD             CGS
 HV1921  HISTORY     - 20020822 GOOD             GEOCAC
 HV1921  HISTORY     - 20201015 GOOD             NGS
 HV1921
 HV1921                          STATION DESCRIPTION
 HV1921
 HV1921'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1921'AT WASHINGTON.
 HV1921'AT WASHINGTON, AT THE INTERSECTION OF TWENTY-EIGHTH AND M STREETS
 HV1921'NORTHWEST, 100 FEET NORTH OF THE CENTERLINE OF M STREET, ON
 HV1921'THE EAST SIDE OF TWENTY-EIGHTH STREET, AT THE CORCORAN SCHOOL,
 HV1921'MIDWAY BETWEEN THE CORNERS OF THE BUILDING, IN THE BRICK WALL,
 HV1921'BETWEEN TWO BASEMENT WINDOWS, AND ABOUT 1 FOOT ABOVE THE SIDEWALK.
 HV1921'A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD DISK, STAMPED
 HV1921'RCP 6 AND SET VERTICALLY.
 HV1921
 HV1921                          STATION RECOVERY (1944)
 HV1921
 HV1921'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1921'RECOVERED IN GOOD CONDITION.
 HV1921
 HV1921                          STATION RECOVERY (2002)
 HV1921
 HV1921'RECOVERY NOTE BY GEOCACHING 2002 (APC)
 HV1921'FORMER SCHOOL BUILDING AT 1219 28TH STREET, NW, IN GEORGETOWN NOW
 HV1921'HOUSES THE HOTEL EMPLOYEES AND RESTAURANT EMPLOYEES INTERNATIONAL
 HV1921'UNION.
 HV1921
 HV1921                          STATION RECOVERY (2020)
 HV1921
 HV1921'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JKH)
 HV1921'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1922 ***********************************************************************
 HV1922  DESIGNATION -  RCPP 7
 HV1922  PID         -  HV1922
 HV1922  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1922  COUNTRY     -  US
 HV1922  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1922
 HV1922                         *CURRENT SURVEY CONTROL
 HV1922  ______________________________________________________________________
 HV1922* NAD 83(1986) POSITION- 38 54 27.     (N) 077 03 22.     (W)   SCALED
 HV1922* NAVD 88 ORTHO HEIGHT -    18.08  (+/-2cm)       59.3   (feet) VERTCON3
 HV1922  ______________________________________________________________________
 HV1922  GEOID HEIGHT    -        -32.029 (meters)                     GEOID18
 HV1922  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1922
 HV1922.The horizontal coordinates were scaled from a map and have
 HV1922.an estimated accuracy of +/- 6 seconds.
 HV1922
 HV1922.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1922.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1922
 HV1922.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1922.GEOID18 height accuracy estimate available here.
 HV1922
 HV1922.The vertical order pertains to the NGVD 29 superseded value.
 HV1922
 HV1922.Click photographs - Photos may exist for this station.
 HV1922
 HV1922
 HV1922_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ217085(NAD 83)
 HV1922
 HV1922                          SUPERSEDED SURVEY CONTROL
 HV1922
 HV1922  NGVD 29 (11/26/84)   18.310  (m)           60.07   (f) ADJUSTED    1 2
 HV1922
 HV1922.Superseded values are not recommended for survey control.
 HV1922
 HV1922.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1922.See file dsdata.pdf to determine how the superseded data were derived.
 HV1922
 HV1922_MARKER: DD = SURVEY DISK
 HV1922_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1922_SP_SET: STEP
 HV1922_STAMPING: RCP 7
 HV1922_MARK LOGO: PBPP
 HV1922_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1922
 HV1922  HISTORY     - Date     Condition        Report By
 HV1922  HISTORY     - UNK      MONUMENTED       PBPP
 HV1922  HISTORY     - 1926     GOOD             PBPP
 HV1922  HISTORY     - 1944     MARK NOT FOUND   CGS
 HV1922
 HV1922                          STATION DESCRIPTION
 HV1922
 HV1922'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1922'AT WASHINGTON.
 HV1922'AT WASHINGTON, AT THE INTERSECTION OF TWENTY-SEVENTH STREET AND
 HV1922'DUMBARTON AVENUE NORTHWEST, AT THE HOUSE AT 2603 DUMBARTON
 HV1922'AVENUE NORTHWEST, AND IN THE TOP OF THE WEST END OF THE BOTTOM
 HV1922'CONCRETE STEP.  A PUBLIC BUILDINGS AND PUBLIC PARKS STANDARD
 HV1922'DISK.  NOTE-- THE PRESENT STEPS LEADING UP TO THE LAST HOUSE
 HV1922'ON THE NORTH SIDE OF DUMBARTON AVENUE ARE BRICK.  THE BOTTOM
 HV1922'STEP IS CONCRETE WITH A BRICK COVERING.  THE MARK MAY BE UNDER
 HV1922'THE BRICKS.
 HV1922
 HV1922                          STATION RECOVERY (1944)
 HV1922
 HV1922'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1922'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1923 ***********************************************************************
 HV1923  DESIGNATION -  RCPP 8
 HV1923  PID         -  HV1923
 HV1923  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1923  COUNTRY     -  US
 HV1923  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1923
 HV1923                         *CURRENT SURVEY CONTROL
 HV1923  ______________________________________________________________________
 HV1923* NAD 83(1986) POSITION- 38 54 26.     (N) 077 03 00.     (W)   SCALED
 HV1923* NAVD 88 ORTHO HEIGHT -    17.933 (meters)       58.84  (feet) ADJUSTED
 HV1923  ______________________________________________________________________
 HV1923  GEOID HEIGHT    -        -32.037 (meters)                     GEOID18
 HV1923  DYNAMIC HEIGHT  -         17.923 (meters)       58.80  (feet) COMP
 HV1923  MODELED GRAVITY -    980,094.6   (mgal)                       NAVD 88
 HV1923
 HV1923  VERT ORDER      -  FIRST     CLASS II
 HV1923
 HV1923.The horizontal coordinates were scaled from a map and have
 HV1923.an estimated accuracy of +/- 6 seconds.
 HV1923
 HV1923.The orthometric height was determined by differential leveling and
 HV1923.adjusted by the NATIONAL GEODETIC SURVEY
 HV1923.in June 1991.
 HV1923
 HV1923.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1923.GEOID18 height accuracy estimate available here.
 HV1923
 HV1923.Click photographs - Photos may exist for this station.
 HV1923
 HV1923.The dynamic height is computed by dividing the NAVD 88
 HV1923.geopotential number by the normal gravity value computed on the
 HV1923.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1923.degrees latitude (g = 980.6199 gals.).
 HV1923
 HV1923.The modeled gravity was interpolated from observed gravity values.
 HV1923
 HV1923
 HV1923_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ222084(NAD 83)
 HV1923
 HV1923                          SUPERSEDED SURVEY CONTROL
 HV1923
 HV1923  NGVD 29 (11/26/84)   18.163  (m)           59.59   (f) ADJUSTED    1 2
 HV1923
 HV1923.Superseded values are not recommended for survey control.
 HV1923
 HV1923.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1923.See file dsdata.pdf to determine how the superseded data were derived.
 HV1923
 HV1923_MARKER: DD = SURVEY DISK
 HV1923_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1923_SP_SET: STEP
 HV1923_STAMPING: RCP 8
 HV1923_MARK LOGO: PBPP
 HV1923_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1923
 HV1923  HISTORY     - Date     Condition        Report By
 HV1923  HISTORY     - UNK      MONUMENTED       PBPP
 HV1923  HISTORY     - 1926     GOOD             PBPP
 HV1923  HISTORY     - 1960     GOOD             CGS
 HV1923
 HV1923                          STATION DESCRIPTION
 HV1923
 HV1923'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1923'AT WASHINGTON.
 HV1923'AT WASHINGTON, AT THE NORTHEAST CORNER OF THE INTERSECTION
 HV1923'OF TWENTY-THIRD AND N STREETS NORTHWEST, AT THE NORTH SIDE OF
 HV1923'AN APARTMENT HOUSE, AT THE BASEMENT ENTRANCE, AND IN THE TOP
 HV1923'OF THE CONCRETE STEPS.  A PUBLIC BUILDINGS AND PUBLIC PARKS
 HV1923'STANDARD DISK, STAMPED RCP 8.
 HV1923
 HV1923                          STATION RECOVERY (1960)
 HV1923
 HV1923'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1923'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1826 ***********************************************************************
 HV1826  DESIGNATION -  RED
 HV1826  PID         -  HV1826
 HV1826  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1826  COUNTRY     -  US
 HV1826  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1826
 HV1826                         *CURRENT SURVEY CONTROL
 HV1826  ______________________________________________________________________
 HV1826* NAD 83(1993) POSITION- 38 56 05.80732(N) 077 06 50.49748(W)   ADJUSTED
 HV1826* NAVD 88 ORTHO HEIGHT -    44.52  (+/-2cm)      146.1   (feet) VERTCON3
 HV1826  ______________________________________________________________________
 HV1826  GEOID HEIGHT    -        -31.915 (meters)                     GEOID18
 HV1826  LAPLACE CORR    -         -1.93  (seconds)                    DEFLEC18
 HV1826  HORZ ORDER      -  SECOND
 HV1826  VERT ORDER      -  THIRD (See Below)
 HV1826
 HV1826.The horizontal coordinates were established by classical geodetic methods
 HV1826.and adjusted by the National Geodetic Survey in November 1994.
 HV1826
 HV1826.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1826.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1826
 HV1826.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1826.GEOID18 height accuracy estimate available here.
 HV1826
 HV1826.The vertical order pertains to the NGVD 29 superseded value.
 HV1826
 HV1826.Click photographs - Photos may exist for this station.
 HV1826
 HV1826.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1826
 HV1826. The following values were computed from the NAD 83(1993) position.
 HV1826
 HV1826;                    North         East     Units Scale Factor Converg.
 HV1826;SPC MD       -   140,790.827   390,113.699   MT  0.99995038   -0 04 17.6
 HV1826;SPC MD       -   461,911.24  1,279,898.03   sFT  0.99995038   -0 04 17.6
 HV1826;SPC VA N     - 2,141,686.637 3,620,162.786   MT  0.99996370   +0 51 54.0
 HV1826;SPC VA N     - 7,026,516.91 11,877,150.74   sFT  0.99996370   +0 51 54.0
 HV1826;UTM  18      - 4,311,682.447   316,766.350   MT  1.00001344   -1 19 44.1
 HV1826
 HV1826!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1826!SPC MD       -   0.99999802  x   0.99995038  =   0.99994840
 HV1826!SPC VA N     -   0.99999802  x   0.99996370  =   0.99996172
 HV1826!UTM  18      -   0.99999802  x   1.00001344  =   1.00001146
 HV1826
 HV1826_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1676611682(NAD 83)
 HV1826
 HV1826                          SUPERSEDED SURVEY CONTROL
 HV1826
 HV1826  NAD 83(1991)-  38 56 05.80616(N)    077 06 50.49891(W) AD(       ) 2
 HV1826  NAD 83(1986)-  38 56 05.80552(N)    077 06 50.50876(W) AD(       ) 2
 HV1826  NAD 27      -  38 56 05.40800(N)    077 06 51.57800(W) AD(       ) 2
 HV1826  USSD        -  38 56 05.74700(N)    077 06 51.40600(W) AD(       ) 3
 HV1826  NGVD 29 (??/??/92)   44.741  (m)          146.79   (f) ADJ UNCH    3 0
 HV1826  NGVD 29              44.74   (m)          146.8    (f) LEVELING    3  
 HV1826
 HV1826.Superseded values are not recommended for survey control.
 HV1826
 HV1826.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1826.See file dsdata.pdf to determine how the superseded data were derived.
 HV1826
 HV1826_MARKER: DS = TRIANGULATION STATION DISK
 HV1826_SETTING: 80 = SET IN A BOULDER
 HV1826_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1826+STABILITY: SURFACE MOTION
 HV1826
 HV1826  HISTORY     - Date     Condition        Report By
 HV1826  HISTORY     - 1913     MONUMENTED       CGS
 HV1826  HISTORY     - 1925     GOOD             CGS
 HV1826  HISTORY     - 1925     GOOD             CGS
 HV1826  HISTORY     - 1943     MARK NOT FOUND   CGS
 HV1826  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV1826
 HV1826                          STATION DESCRIPTION
 HV1826
 HV1826'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV1826'STATION IS NEAR SUMMIT OF PROMINENT HILL LOCATED ABOUT 300
 HV1826'METERS SE OF THE NW LINE OF THE DISTRICT OF COLUMBIA AND
 HV1826'500 METERS N OF CHAIN BRIDGE.  STATION IS 44 FEET FROM EDGE
 HV1826'OF RAILROAD CUT, 50 OR 75 FEET S OF THE SUMMIT OF HILL AND 62
 HV1826'AND 63 FEET FROM NEAREST OF SMALL TREES BORDERING PROPOSED
 HV1826'STREET.  IT IS ABOUT 50 FEET ABOVE THE RAILROAD TRACK AND
 HV1826'4 FEET BELOW THE HILL SUMMIT.  MARKED BY A STANDARD COAST
 HV1826'AND GEODETIC SURVEY BRONZE DISK SET IN 2- BY 1-FOOT TRIANGULAR
 HV1826'BOULDER WITH ITS TOP SLIGHTLY ABOVE THE SURFACE OF THE
 HV1826'GROUND.  THE SUBSURFACE MARK IS A 3/4-INCH DRILL HOLE
 HV1826'SURROUNDED BY A TRIANGLE CUT IN AN IRREGULAR-SHAPED 2- BY
 HV1826'1/2-FOOT BOULDER SET WITH TOP 1 FOOT BELOW THE SURFACE OF
 HV1826'THE GROUND.
 HV1826
 HV1826                          STATION RECOVERY (1925)
 HV1826
 HV1826'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1925 (GLB)
 HV1826'STATION FOUND AS DESCRIBED.
 HV1826
 HV1826                          STATION RECOVERY (1925)
 HV1826
 HV1826'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1925
 HV1826'AT WASHINGTON.
 HV1826'AT WASHINGTON, NEAR THE DALECARLIA FILTRATION PLANT, ABOUT 1000
 HV1826'FEET SOUTHEAST OF THE DISTRICT OF COLUMBIA-MARYLAND LINE, ABOUT
 HV1826'1500 FEET NORTH OF THE EAST END OF CHAIN BRIDGE, ON THE EAST SIDE
 HV1826'OF POTOMAC RIVER, NEAR THE SUMMIT OF A PROMINENT HILL, 44 FEET
 HV1826'FROM THE EDGE OF A RAILROAD CUT, 62 FEET SOUTHWEST OF THE TENTH
 HV1826'TREE FROM THE NORTHWEST END OF A ROW OF TREES ALONG POTOMAC
 HV1826'AVENUE, IN THE TOP OF A LARGE TRIANGULAR-SHAPED BOULDER, ABOUT
 HV1826'50 FEET HIGHER THAN THE TRACK, AND ABOUT 4 FEET BELOW THE SUMMIT
 HV1826'OF THE HILL.  A STANDARD TRIANGULATION-STATION DISK.  NOTE-- IT
 HV1826'WAS REPORTED THAT NO TRIANGULAR-SHAPED 1- BY 2-FOOT BOULDER IS
 HV1826'VISIBLE BETWEEN THE STREET AND THE RAILROAD CUT.
 HV1826
 HV1826                          STATION RECOVERY (1943)
 HV1826
 HV1826'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943
 HV1826'MARK NOT FOUND.
 HV1826
 HV1826                          STATION RECOVERY (1971)
 HV1826
 HV1826'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1826'STATION WAS SEARCHED FOR BUT NOT FOUND, AND IS BELIEVED TO
 HV1826'HAVE BEEN DESTROYED BY LATER WIDENING OF POTOMAC AVENUE,
 HV1826'AS THE DISTANCE OF 44 FEET FROM EDGE OF RAILROAD CUT NOW
 HV1826'FALLS IN THE MACADAM SURFACE OF THE STREET.
 HV1826'
 HV1826'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DISTRICT
 HV1826'OF COLUMBIA
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4715 ***********************************************************************
 HV4715  DESIGNATION -  RED BRICK STACK S OF BELLEVUE
 HV4715  PID         -  HV4715
 HV4715  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4715  COUNTRY     -  US
 HV4715  USGS QUAD   -  ALEXANDRIA (2019)
 HV4715
 HV4715                         *CURRENT SURVEY CONTROL
 HV4715  ______________________________________________________________________
 HV4715* NAD 83(1993) POSITION- 38 48 50.66424(N) 077 00 54.27009(W)   ADJUSTED
 HV4715  ______________________________________________________________________
 HV4715  GEOID HEIGHT    -        -32.249 (meters)                     GEOID18
 HV4715  LAPLACE CORR    -         -3.08  (seconds)                    DEFLEC18
 HV4715  HORZ ORDER      -  THIRD
 HV4715
 HV4715.The horizontal coordinates were established by classical geodetic methods
 HV4715.and adjusted by the National Geodetic Survey in November 1994.
 HV4715
 HV4715.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4715.GEOID18 height accuracy estimate available here.
 HV4715
 HV4715.Click photographs - Photos may exist for this station.
 HV4715
 HV4715.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4715
 HV4715. The following values were computed from the NAD 83(1993) position.
 HV4715
 HV4715;                    North         East     Units Scale Factor Converg.
 HV4715;SPC MD       -   127,366.938   398,690.759   MT  0.99995043   -0 00 34.1
 HV4715;SPC MD       -   417,869.70  1,308,037.93   sFT  0.99995043   -0 00 34.1
 HV4715;SPC VA N     - 2,128,404.598 3,628,958.157   MT  0.99995425   +0 55 36.4
 HV4715;SPC VA N     - 6,982,940.75 11,906,006.89   sFT  0.99995425   +0 55 36.4
 HV4715;UTM  18      - 4,298,073.224   325,047.573   MT  0.99997692   -1 15 48.1
 HV4715
 HV4715_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2504798073(NAD 83)
 HV4715
 HV4715                          SUPERSEDED SURVEY CONTROL
 HV4715
 HV4715  NAD 83(1991)-  38 48 50.66257(N)    077 00 54.27149(W) AD(       ) 3
 HV4715  NAD 83(1986)-  38 48 50.66236(N)    077 00 54.28323(W) AD(       ) 3
 HV4715  NAD 27      -  38 48 50.25000(N)    077 00 55.36000(W) AD(       ) 3
 HV4715
 HV4715.Superseded values are not recommended for survey control.
 HV4715
 HV4715.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4715.See file dsdata.pdf to determine how the superseded data were derived.
 HV4715
 HV4715_MARKER: 63 = STACK
 HV4715
 HV4715  HISTORY     - Date     Condition        Report By
 HV4715  HISTORY     - 1928     FIRST OBSERVED   CGS
 HV4715  HISTORY     - 1938     GOOD             CGS
 HV4715
 HV4715                          STATION DESCRIPTION
 HV4715
 HV4715'DESCRIBED BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4715'NO PREVIOUSLY DESCRIPTION OF STATION.  THIS STATION IS
 HV4715'ERRONEOUSLY LISTED AS BEING IN MARYLAND.  IT IS LOCATED IN THE
 HV4715'GROUNDS OF THE HOME FOR THE AGED AND INFIRM.  STATION RECOVERED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4411 ***********************************************************************
 HV4411  DESIGNATION -  REGATTA
 HV4411  PID         -  HV4411
 HV4411  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4411  COUNTRY     -  US
 HV4411  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4411
 HV4411                         *CURRENT SURVEY CONTROL
 HV4411  ______________________________________________________________________
 HV4411* NAD 83(1993) POSITION- 38 52 53.64538(N) 077 03 14.01163(W)   ADJUSTED
 HV4411* NAVD 88 ORTHO HEIGHT -     5.2   (meters)       17.    (feet) VERTCON3
 HV4411  ______________________________________________________________________
 HV4411  GEOID HEIGHT    -        -32.078 (meters)                     GEOID18
 HV4411  LAPLACE CORR    -         -2.82  (seconds)                    DEFLEC18
 HV4411  HORZ ORDER      -  THIRD
 HV4411
 HV4411.The horizontal coordinates were established by classical geodetic methods
 HV4411.and adjusted by the National Geodetic Survey in November 1994.
 HV4411
 HV4411.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4411.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4411
 HV4411.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4411.GEOID18 height accuracy estimate available here.
 HV4411
 HV4411.Click photographs - Photos may exist for this station.
 HV4411
 HV4411.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4411
 HV4411. The following values were computed from the NAD 83(1993) position.
 HV4411
 HV4411;                    North         East     Units Scale Factor Converg.
 HV4411;SPC MD       -   134,860.603   395,323.982   MT  0.99994985   -0 02 01.8
 HV4411;SPC MD       -   442,455.16  1,296,992.10   sFT  0.99994985   -0 02 01.8
 HV4411;SPC VA N     - 2,135,842.295 3,625,469.354   MT  0.99995898   +0 54 09.2
 HV4411;SPC VA N     - 7,007,342.60 11,894,560.71   sFT  0.99995898   +0 54 09.2
 HV4411;UTM  18      - 4,305,639.078   321,845.600   MT  0.99999084   -1 17 22.5
 HV4411
 HV4411!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4411!SPC MD       -   1.00000422  x   0.99994985  =   0.99995407
 HV4411!SPC VA N     -   1.00000422  x   0.99995898  =   0.99996320
 HV4411!UTM  18      -   1.00000422  x   0.99999084  =   0.99999506
 HV4411
 HV4411:                Primary Azimuth Mark                     Grid Az
 HV4411:SPC MD       -  WASHINGTON MONUMENT                      061 34 33.3
 HV4411:SPC VA N     -  WASHINGTON MONUMENT                      060 38 22.3
 HV4411:UTM  18      -  WASHINGTON MONUMENT                      062 49 54.0
 HV4411
 HV4411_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2184505639(NAD 83)
 HV4411
 HV4411|---------------------------------------------------------------------|
 HV4411| PID    Reference Object                     Distance      Geod. Az  |
 HV4411|                                                           dddmmss.s |
 HV4411| HV4264 OLD POST OFFICE FINIAL              APPROX. 2.7 KM 0575902.4 |
 HV4411| HV4442 WASHINGTON MONUMENT                 APPROX. 1.8 KM 0613231.5 |
 HV4411| HV4522 BUREAU ENGRAVING RED TWR            APPROX. 2.0 KM 0705411.9 |
 HV4411| HV3621 ARLINGTON CEMETERY LEE MANSION      APPROX. 1.6 KM 2682456.0 |
 HV4411| HV3961 GEORGETOWN UNIV LOWER SPIRE         APPROX. 3.3 KM 3294331.2 |
 HV4411|---------------------------------------------------------------------|
 HV4411
 HV4411                          SUPERSEDED SURVEY CONTROL
 HV4411
 HV4411  NAD 83(1991)-  38 52 53.64410(N)    077 03 14.01312(W) AD(       ) 3
 HV4411  NAD 83(1986)-  38 52 53.64385(N)    077 03 14.02375(W) AD(       ) 3
 HV4411  NAD 27      -  38 52 53.23800(N)    077 03 15.10800(W) AD(       ) 3
 HV4411  NGVD 29 (07/19/86)    5.4    (m)           18.     (f) VERT ANG       
 HV4411
 HV4411.Superseded values are not recommended for survey control.
 HV4411
 HV4411.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4411.See file dsdata.pdf to determine how the superseded data were derived.
 HV4411
 HV4411_MARKER: DE = TRAVERSE STATION DISK
 HV4411_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV4411_STAMPING: REGATTA 1935
 HV4411_MARK LOGO: CGS
 HV4411_PROJECTION: RECESSED 15 CENTIMETERS
 HV4411_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV4411+STABILITY: SURFACE MOTION
 HV4411_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4411+SATELLITE: SATELLITE OBSERVATIONS - March 30, 2022
 HV4411
 HV4411  HISTORY     - Date     Condition        Report By
 HV4411  HISTORY     - 1935     MONUMENTED       CGS
 HV4411  HISTORY     - 1939     GOOD             CGS
 HV4411  HISTORY     - 1946     GOOD             CGS
 HV4411  HISTORY     - 1959     GOOD             CGS
 HV4411  HISTORY     - 1979     GOOD             NGS
 HV4411  HISTORY     - 20120519 GOOD             PROFLN
 HV4411  HISTORY     - 20220330 GOOD             NGS
 HV4411
 HV4411                          STATION DESCRIPTION
 HV4411
 HV4411'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (LOC)
 HV4411'THIS TRAVERSE STATION IS A STANDARD BRONZE DISK STAMPED REGATTA
 HV4411'1935 SET IN THE TOP OF A CONCRETE MONUMENT, 10 INCHES IN DIAMETER
 HV4411'AT THE TOP, 14 INCHES SQUARE AT THE BOTTOM, AND 36 INCHES DEEP
 HV4411'WITH THE MARK 5 INCHES BELOW THE GROUND LEVEL (A 2 1/2- BY 5-INCH
 HV4411'BY 4-FOOT OAK PLANK WAS DRIVEN IN THE BOTTOM OF THE HOLE LEAVING
 HV4411'ABOUT 6 INCHES PROTRUDING, WHICH WAS SURROUNDED BY THE CONCRETE
 HV4411'OF THE MONUMENT) NEAR THE CENTER OF THE E SIDE OF COLUMBIA
 HV4411'ISLAND IN THE GRASS AND ABOUT 1/2 MILE NW OF THE SE END.  MARK
 HV4411'IS ON THE EDGE OF THE BANK WHERE IT BREAKS OFF SHARPLY TO THE
 HV4411'WATER, ABOUT 16 FEET ABOVE AND 54 FEET (INCLINED) FROM THE
 HV4411'HIGH-WATER LINE, 89.1 FEET NE OF TALL IRON LAMP POST NO. 25, WHICH
 HV4411'IS THE 10TH LAMP POST ON THE NE SIDE OF THE MOUNT VERNON
 HV4411'HIGHWAY STARTING WITH THE FIRST LAMP POST WHICH IS ABOUT 15
 HV4411'FEET FROM THE ARLINGTON END OF THE ARLINGTON MEMORIAL
 HV4411'BRIDGE, 59.5 FEET NE OF THE CENTER LINE OF THE CINDER BRIDLE
 HV4411'PATH, 47.4 FEET NE OF AN 8-INCH DIAMETER APPLE TREE,
 HV4411'21.8 FEET N OF AN 1 1/2-INCH DIAMTERE ELM TREE, AND 33.8 FEET
 HV4411'NNW OF A 1 1/2-INCH DIAMETER ELM TREE.  THE MARK IS THE
 HV4411'1/2-MILE FOR THE 1 MILE SPEEDBOAT RACE COURSE WITH THE START AT
 HV4411'GATE - START AND THE FINISH AT COURSE - FINISH.
 HV4411'
 HV4411'THE LINE SPEED-REGATTA IS 90 DEG TO THE AXIS OF THE RACE COURSE.
 HV4411'
 HV4411'NOTE--DISTANCES MEASURED ON THE GROUND OR SLOPE AS CASE MAY BE.
 HV4411
 HV4411                          STATION RECOVERY (1939)
 HV4411
 HV4411'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4411'THE STATION RECOVERED IN GOOD CONDITION.  THE DESCRIPTION IS
 HV4411'ADEQUATE, HOWEVER, THE LAMP POST NUMBERS SHOULD BE DISREGARDED
 HV4411'AS THEY ARE CHANGED.  THE STATION IS DESCRIBED AND MARKED AS A
 HV4411'TRAVERSE STATION.
 HV4411
 HV4411                          STATION RECOVERY (1946)
 HV4411
 HV4411'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4411'STATION RECOVERED AS DESCRIBED AND FOUND TO BE IN GOOD CONDITION.
 HV4411'DESCRIPTION IS ADEQUATE.
 HV4411
 HV4411                          STATION RECOVERY (1959)
 HV4411
 HV4411'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (BFL)
 HV4411'RECOVERED AS DESCRIBED EXCEPT DELETE REFERENCE (21.8 FT N OF
 HV4411'1-1/2 INCH ELM) AND CHANGE (33.8 FT NNW OF 1-1/2 IN ELM) TO
 HV4411'(33.8 FT NNW OF 12 INCH ELM).  ALSO CHANGE (8 IN. APPLE TREE)
 HV4411'TO (18 INCH APPLE TREE).
 HV4411
 HV4411                          STATION RECOVERY (1979)
 HV4411
 HV4411'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 (BMP)
 HV4411'THE STATION IS ON COLUMBIA ISLAND A PART OF THE DISTRICT OF
 HV4411'COLUMBIA ON THE WEST OR VIRGINIA SIDE OF THE POTOMAC RIVER.
 HV4411'
 HV4411'TO REACH THE STATION FROM THE PARKING AREA FOR THE MARINERS
 HV4411'MEMORIAL AT THE SOUTH END OF THE ISLAND PROCEED NORTH ON THE
 HV4411'GEORGE WASHINGTON PARKWAY FOR 0.7 KM (0.43 MI) TO APPROXIMATELY
 HV4411'80 METERS SOUTH OF WHERE THE NORTH BOUND LANE OF THE PARKWAY
 HV4411'DIVIDES ABOUT 800 METERS SOUTH OF MEMORIAL BRIDGE. THE STATION IS
 HV4411'ON THE RIGHT RIVER SIDE OF THE PARKWAY.
 HV4411'
 HV4411'THE STATION IS A STANDARD TRAVERSE DISK STAMPED---REGATTA 1935---
 HV4411'SET IN A CONCRETE MONUMENT 10 CM BELOW GROUND LEVEL. IT IS AT THE
 HV4411'TOP OF A GRASS EMBANKMENT APPROXIMATELY 30 METERS FROM THE RIVER
 HV4411'BANK, 26.5 METERS (87.3 FT) EAST OF AND JUST BELOW THE LEVEL
 HV4411'OF THE PARKWAY, 14.5 METERS (47.5 FT) NORTH NORTHEAST OF A
 HV4411'1 METER IN DIAMETER CRABAPPLE TREE, 10.0 METERS (33.0 FT)
 HV4411'NORTH OF A 0.5 METER FRUIT TREE, AND 5.7 METERS (18.7 FT) EAST OF
 HV4411'A PAVED BICYCLE PATH.
 HV4411
 HV4411                          STATION RECOVERY (2012)
 HV4411
 HV4411'RECOVERY NOTE BY PROFESSIONAL LAND SURVEYOR 2012 (JRO)
 HV4411'THE STATION IS ON THE EASTERLY SIDE OF THE BIKE PATH THAT RUNS ALONG
 HV4411'THE GEORGE WASHINGTON MEMORIAL PARKWAY, ABOUT 0.75 MI (1.2 KM)
 HV4411'NORTHERLY FROM THE PENTAGON.  OWNERSHIP--NATIONAL PARK SERVICE.
 HV4411'
 HV4411'THE STATION WAS RECOVERED BY TRAVERSE FROM AN ECCENTRIC POINT
 HV4411'POSITIONED BY OPUS-RS.  IT IS ON THE EASTERLY OR RIVER SIDE OF THE
 HV4411'BIKE PATH, ALONG A SHORT SECTION OF TANGENT BETWEEN TWO CURVES OF THE
 HV4411'PATH, A LITTLE NORTH AND ACROSS THE PATH FROM A BENCH.  THIS AREA IS
 HV4411'EASTERLY FROM A POINT ALONG THE GW PARKWAY THAT IS ABOUT 300 FT (91.4
 HV4411'M) SOUTH OF THE SPLIT WHERE YOU GO LEFT FOR US 50 AND RIGHT FOR I-66
 HV4411'AND I-495.  A VEHICLE CAN BE PARKED AT THE LARGE LOT FOR THE US PARK
 HV4411'SERVICE LYNDON B. JOHNSON MEMORIAL GROVE ON COLUMBIA ISLAND / COLUMBIA
 HV4411'ISLAND MARINA.  THIS LOT IS REACHED FROM SOUTHBOUND GW PARKWAY.  FROM
 HV4411'THE SOUTH END OF THE LOT TAKE THE BIKE PATH UNDER THE PARKWAY
 HV4411'OVERPASS, THEN PROCEED NORTHERLY 0.5 MI (0.8 KM) TO THE MARK ON THE
 HV4411'RIGHT.  ANOTHER PARKING POSSIBILITY IS THE SMALLER PARK SERVICE LOT ON
 HV4411'THE EAST SIDE OF THE ACCESS ROAD ON THE EAST SIDE OF THE PENTAGON
 HV4411'RESERVATION.  FROM THIS LOT, CROSS THE BRIDGE TO COLUMBIA ISLAND AND
 HV4411'THEN EITHER WALK SOUTH ALMOST HALF A MILE TO THE BIKE PATH MENTIONED
 HV4411'ABOVE OR HEAD NORTHEAST ACROSS COUNTRY TO THE PARKWAY, WHERE YOU'RE ON
 HV4411'YOUR OWN TO CROSS, BUT CLOSER TO THE STATION.
 HV4411'
 HV4411'AZIMUTHS BELOW ARE REFERENCED TO GEODETIC NORTH, THE THEODOLITE BEING
 HV4411'ORIENTED TO THE AZIMUTH TO THE WASHINGTON MONUMENT.  THE AZIMUTH OF
 HV4411'THE BIKE PATH HERE IS SE-NW.  THE STATION IS 17.5 FT (5.3 M) NORTHEAST
 HV4411'OF THE CENTERLINE OF THE BIKE PATH AND 10 FT (3.0 M) NORTHWEST OF THE
 HV4411'LINE EXTENDED FROM A STREETLIGHT OUT BY GW PARKWAY THROUGH THE BACK
 HV4411'RIGHT OR NORTHWEST LEG OF THE BENCH, 4 FT (1.2 M) BELOW THE PAVEMENT
 HV4411'OF THE PARKWAY, 2 FT (0.6 M) BELOW THE BIKE PATH AND 0.5 FT (15 CM)
 HV4411'BELOW GROUND.
 HV4411'
 HV4411'ALSO 30.5 FT (9.3 M) NORTH-NORTHEAST (AZ 20 DEG) FROM THAT LEG OF THE
 HV4411'BENCH, 88.0 FT (26.8 M) NORTHEAST (AZ 35) FROM THE EASTERLY CURB OF
 HV4411'THE PARKWAY, 83.7 FT (25.5 M) ON THE SAME AZIMUTH FROM THE STREETLIGHT
 HV4411'AND 81.0 FT (24.7 M) NORTHEAST FROM A MANHOLE BY THE STREETLIGHT, 80.5
 HV4411'FT (24.5 M) NORTHWEST (AZ 330) FROM AN 18 INCH (46 CM) PINE TREE WHICH
 HV4411'IS 4 FT (1.2 M) NORTHEAST OF THE BIKE PATH (MEASURED FROM 4 FT (1.2 M)
 HV4411'UP ON THE TREE, WHICH LEANS AWAY FROM THE STATION), 58.5 FT (17.8 M)
 HV4411'NORTHWEST (AZ 315) FROM A 24 INCH (61 CM) PINE WHICH IS 20 FT (6.1 M)
 HV4411'NORTHEAST OF THE PATH, 46.5 FT (14.2 M) NORTHEAST (AZ 40) FROM A 30
 HV4411'INCH (76 CM) MULTI-TRUNK WILLOW TREE WHICH IS 23 FT (7.0 M) SOUTHWEST
 HV4411'OF THE PATH, 39.5 FT (12.0 M) EASTERLY (AZ 75) FROM A 30 INCH (76 CM)
 HV4411'WILLOW WHICH IS 15 FT (4.6 M) SOUTHWEST OF THE PATH, 76 FT (23.2 M)
 HV4411'SOUTHWEST MEASURED ON THE SLOPE FROM THE MOWED GRASS EDGE AT THE TOP
 HV4411'OF THE RIVER BANK, WHICH IS ABOUT 15 FT (4.6 M) BELOW THE STATION.
 HV4411
 HV4411                          STATION RECOVERY (2022)
 HV4411
 HV4411'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2022 (GAS)
 HV4411'THE MARK IS UNDER AN IRRIGATION CONTROL VALVE COVER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4384 ***********************************************************************
 HV4384  DESIGNATION -  RENO RESET
 HV4384  PID         -  HV4384
 HV4384  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4384  COUNTRY     -  US
 HV4384  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4384
 HV4384                         *CURRENT SURVEY CONTROL
 HV4384  ______________________________________________________________________
 HV4384* NAD 83(1993) POSITION- 38 57 09.41804(N) 077 04 40.09581(W)   ADJUSTED
 HV4384* NAVD 88 ORTHO HEIGHT -   149.2   (meters)      490.    (feet) VERTCON3
 HV4384  ______________________________________________________________________
 HV4384  GEOID HEIGHT    -        -31.934 (meters)                     GEOID18
 HV4384  LAPLACE CORR    -         -2.69  (seconds)                    DEFLEC18
 HV4384  HORZ ORDER      -  FIRST
 HV4384
 HV4384.The horizontal coordinates were established by classical geodetic methods
 HV4384.and adjusted by the National Geodetic Survey in November 1994.
 HV4384
 HV4384.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4384.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4384
 HV4384.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4384.GEOID18 height accuracy estimate available here.
 HV4384
 HV4384.Click photographs - Photos may exist for this station.
 HV4384
 HV4384.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4384
 HV4384. The following values were computed from the NAD 83(1993) position.
 HV4384
 HV4384;                    North         East     Units Scale Factor Converg.
 HV4384;SPC MD       -   142,749.015   393,255.925   MT  0.99995074   -0 02 55.8
 HV4384;SPC MD       -   468,335.73  1,290,207.15   sFT  0.99995074   -0 02 55.8
 HV4384;SPC VA N     - 2,143,695.950 3,623,272.630   MT  0.99996545   +0 53 15.4
 HV4384;SPC VA N     - 7,033,109.13 11,887,353.62   sFT  0.99996545   +0 53 15.4
 HV4384;UTM  18      - 4,313,571.307   319,950.973   MT  0.99999919   -1 18 23.8
 HV4384
 HV4384!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4384!SPC MD       -   0.99998160  x   0.99995074  =   0.99993235
 HV4384!SPC VA N     -   0.99998160  x   0.99996545  =   0.99994706
 HV4384!UTM  18      -   0.99998160  x   0.99999919  =   0.99998079
 HV4384
 HV4384:                Primary Azimuth Mark                     Grid Az
 HV4384:SPC MD       -  WASHINGTON MONUMENT                      152 15 59.9
 HV4384:SPC VA N     -  WASHINGTON MONUMENT                      151 19 48.7
 HV4384:UTM  18      -  WASHINGTON MONUMENT                      153 31 27.9
 HV4384
 HV4384_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1995013571(NAD 83)
 HV4384
 HV4384|---------------------------------------------------------------------|
 HV4384| PID    Reference Object                     Distance      Geod. Az  |
 HV4384|                                                           dddmmss.s |
 HV4384| HV4200 CATHOLIC                            APPROX. 1.8 KM 0071816.0 |
 HV4384| JV4299 WHEATON RAD STA WMDO TOWER          APPROX.10.0 KM 0112754.3 |
 HV4384| JV4306 WHEATON RAD STA WTOP CEN TOWER      APPROX.10.3 KM 0152853.0 |
 HV4384| JV4286 FOREST GLEN STANDPIPE               APPROX. 6.8 KM 0160916.3 |
 HV4384| JV4288 WHEATON RAD STA WGAY MAST           APPROX.10.7 KM 0222937.3 |
 HV4384| JV4303 FOREST GLEN RAD STA WOL FM TWR      APPROX. 6.0 KM 0255420.7 |
 HV4384| HV4281 MEDICO                              APPROX. 4.9 KM 0591002.8 |
 HV4384| HV4385 RENO STANDPIPE                       77.043 METERS 09146     |
 HV4384| DC7102 RENO RM 3 CROSS                       1.915 METERS 10232     |
 HV4384| HV4148 CLOCK                               APPROX. 6.1 KM 1081927.8 |
 HV4384| HV4202 N W 115 A                           317.482 METERS 11755     |
 HV4384| HV4439 UNITY                               APPROX. 4.7 KM 1291540.8 |
 HV4384| HV4206 BUREAU STANDARDS WIRELESS TWR       APPROX. 1.5 KM 1432557.7 |
 HV4384| HV4442 WASHINGTON MONUMENT                 APPROX. 7.9 KM 1521304.1 |
 HV4384| HV4557 ARLINGTON TALL RAD TWR OF 3         APPROX. 9.5 KM 1812719.2 |
 HV4384| DC7101 RENO RM 2                             5.570 METERS 18217     |
 HV4384| HV4171 WASHINGTON TV STA WRC TOWER         APPROX. 1.4 KM 1920633.0 |
 HV4384| HV4186 WASHINGTON TV STA WTOP TOWER        317.646 METERS 20459     |
 HV4384| DC7103 RENO RM 3                             4.375 METERS 28031     |
 HV4384| HV4480 WASHINGTON TOLMAN LAUNDRY STK       APPROX. 0.9 KM 3120606.2 |
 HV4384| JV4345 BETHESDA RAD STA WMAL E TWR         APPROX. 8.8 KM 3221635.8 |
 HV4384| HV4369 STANDPIPE NEAR STA DULCE            APPROX. 4.7 KM 3224104.4 |
 HV4384| JV4278 ALTA VISTA WHITE STANDPIPE          APPROX. 6.4 KM 3350327.3 |
 HV4384| JV4361 AIRWAY BCN FLASH RED AND WHITE      APPROX.13.2 KM 3410204.3 |
 HV4384| DC7100 RENO RM 2 CROSS                       1.577 METERS 35452     |
 HV4384| DC7099 RENO RM 1                                          35558     |
 HV4384|---------------------------------------------------------------------|
 HV4384
 HV4384                          SUPERSEDED SURVEY CONTROL
 HV4384
 HV4384  NAD 83(1991)-  38 57 09.41728(N)    077 04 40.09687(W) AD(       ) 1
 HV4384  NAD 83(1986)-  38 57 09.41689(N)    077 04 40.10690(W) AD(       ) 1
 HV4384  NAD 27      -  38 57 09.01908(N)    077 04 41.18144(W) AD(       ) 1
 HV4384  USSD        -  38 57 09.35500(N)    077 04 41.00000(W) AD(       ) 3
 HV4384  NGVD 29 (07/19/86)  149.4    (m)          490.     (f) VERT ANG       
 HV4384
 HV4384.Superseded values are not recommended for survey control.
 HV4384
 HV4384.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4384.See file dsdata.pdf to determine how the superseded data were derived.
 HV4384
 HV4384_MARKER: DS = TRIANGULATION STATION DISK
 HV4384_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV4384
 HV4384  HISTORY     - Date     Condition        Report By
 HV4384  HISTORY     - 1933     MONUMENTED       CGS
 HV4384  HISTORY     - 1934     GOOD             CGS
 HV4384  HISTORY     - 1934     GOOD             CGS
 HV4384  HISTORY     - 1935     GOOD             CGS
 HV4384  HISTORY     - 1956     GOOD             CGS
 HV4384  HISTORY     - 1960     GOOD             MADHOP
 HV4384  HISTORY     - 1969     GOOD             CGS
 HV4384
 HV4384                          STATION DESCRIPTION
 HV4384
 HV4384'DESCRIBED BY COAST AND GEODETIC SURVEY 1933 (RDH)
 HV4384'STATION IS IN TENNALLYTOWN, ON THE TOP OF THE RENO STANDPIPE.  THE
 HV4384'STATION WAS MARKED WITH A REGULAR STANDARD BRONZE DISK SET IN A
 HV4384'CONCRETE BLOCK WHICH WAS SET OVER THE OLD STATION.  THE OLD STATION
 HV4384'WAS A CHALKED TRIANGLE MARKING THE STATION AND THE BRONZE MARK WAS
 HV4384'SET OVER THIS TRIANGLE BUT THE TILE WAS NOT PUNCTURED, DUE TO THE
 HV4384'WATER RESERVOIR BELOW.  THE TWO (CROSSES) REFERENCES TO THE
 HV4384'STATION WERE RECOVERED ON THE TOP OF THE PARAPET ENCIRCLING THE
 HV4384'TOP OF THE TOWER.  THE N CROSS OR REFERENCE MARK NO.2 IS 1.625
 HV4384'METERS N OF THE STATION AND THE E CROSS OR REFERENCE MARK NO.3
 HV4384'IS 1.915 METERS E OF THE STATION.  THESE CROSSES ARE RANGED TO
 HV4384'STATIONS CHEVY AND HOME RESPECTIVELY.
 HV4384'
 HV4384'TWO NEW REFERENCE MARKS WERE ESTABLISHED AT THIS STATION AND
 HV4384'MARKED RENO 1917 1933.
 HV4384'
 HV4384'REFERENCE MARK NO.2 IS 5.570 METERS SW OF THE STATION SET
 HV4384'VERTICALLY IN THE WALL ENCIRCLING THE TOP OF THE TOWER, 3-1/2 FEET
 HV4384'ABOVE THE FLOOR SPACE, IN THE CRACK BETWEEN THE FIRST AND SECOND
 HV4384'ROW OF BRICK BELOW THE COPING.
 HV4384'
 HV4384'REFERENCE MARK NO.3 IS 4.375 METERS NW OF THE STATION SET
 HV4384'VERTICALLY ON THE INSIDE OF THE COPING WALL, 3 FEET ABOVE THE FLOOR
 HV4384'SPACE SET IN THE CRACK BETWEEN THE THIRD AND FOURTH ROW OF BRICK
 HV4384'BELOW THE COPING.
 HV4384'
 HV4384'THE REFERENCE MARKS WERE TOO CLOSE TO GET AN ACCURATE POINTING AS
 HV4384'THE INSTRUMENT COULD NOT BE FOCUSED ON THEM.
 HV4384'
 HV4384'THE STATION IS REACHED BY GOING OUT EITHER WISCONSIN OR CONNECTICUT
 HV4384'AVENUES TO POINTS OPPOSITE THE NEW STANDPIPE WHICH IS VISIBLE FROM
 HV4384'POINTS ALONG EITHER AVENUE.  THE NEW STANDPIPE HAS A LIGHT ON TOP
 HV4384'AND IS DIRECTLY BELOW THE FINIAL.
 HV4384'
 HV4384'THERE ARE PLENTY OF CUT INS AT THIS STATION TO USE AS AZIMUTH
 HV4384'MARKS AND SEVERAL OF THE MOST PROMINENT WERE CUT IN.
 HV4384
 HV4384                          STATION RECOVERY (1934)
 HV4384
 HV4384'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1934 (JB)
 HV4384'THE DESCRIPTION OF THE MARKS AND THE STATION ARE GOOD.  THE
 HV4384'DISTANCES TO THE REFERENCES TO THE STATION CHECKED VERY
 HV4384'CLOSELY.  THE STATION WAS SET ECCENTRICALLY IN ORDER TO CLEAR THE
 HV4384'LINE TO TEMPLE WHICH WAS OBSTRUCTED BY A CONCRETE ELEVATOR WHICH
 HV4384'IS ERECTED FOR THE CONSTRUCTION OF A NEW BUILDING.  THIS BUILDING
 HV4384'WHEN ERECTED WILL OBSTRUCT THIS LINE COMPLETELY IN THE FUTURE.
 HV4384'THE DISTANCE AND DIRECTION WERE MEASURED FROM THE ECCENTRIC
 HV4384'STATION TO THE TRUE STATION.
 HV4384'
 HV4384'DISTANCES TO THE REFERENCE MARKS BOTH THE TABLETS AND THE CROSSES
 HV4384'WERE MEASURED TO THE TRUE STATION.
 HV4384'
 HV4384'STATION IS A REGULAR MARK SET IN A CONCRETE BLOCK ON THE TILE
 HV4384'FLOOR OF THE TOP OF THE STANDPIPE AND STAMPED RENO 1917 1933.  THE
 HV4384'MARK IS IN EXCELLENT CONDITION AS ARE THE TWO REFERENCE MARKS SET
 HV4384'VERTICALLY IN THE WALL COPING.  THE REFERENCE MARKS ARE STAMPED
 HV4384'RENO 1917 1933.
 HV4384'
 HV4384'TO REACH THE STATION GO OUT EITHER WISCONSIN OR CONNECTICUT
 HV4384'AVENUES ON THE NW PART OF THE CITY TO FESSENDEN STREET WHICH RUNS
 HV4384'BETWEEN WISCONSIN AND CONNECTICUT AVENUES.  THE STANDPIPE CAN BE
 HV4384'SEEN FROM EITHER AVENUE AND IS KNOWN AS THE RENO STANDPIPE.
 HV4384'
 HV4384'THREE ADDITIONAL CUTS WERE MADE WHICH ARE AIR BEACONS AND CAN BE
 HV4384'REDUCED TO THE TRUE STATION.
 HV4384
 HV4384                          STATION RECOVERY (1934)
 HV4384
 HV4384'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1934 (JB)
 HV4384'THIS FIRST-ORDER STATION IS LOCATED ON THE ROOF OF THE OLD MUNICIPAL
 HV4384'STANDPIPE, WHICH CAN BE REACHED BY GOING OUT EITHER WISCONSIN OR
 HV4384'CONNECTICUT AVENUES TO POINTS OPPOSITE THE NEW STANDPIPE WHICH IS
 HV4384'VISIBLE FROM POINTS ALONG EITHER AVENUE.  THE OLD STANDPIPE IS
 HV4384'CLOSE TO THE NEW ONE.
 HV4384'
 HV4384'STATION MARK IS AN 8- BY 8-INCH CONCRETE BLOCK SET ON THE ROOF
 HV4384'(TILE) AND PROJECTING ABOUT 3 INCHES.  IT IS STAMPED RENO 1917 1933,
 HV4384'IN STANDARD DISK.
 HV4384'
 HV4384'REFERENCE MARK NO.2 IS 18.53 FEET S OF STATION (INCLINED DISTANCE)
 HV4384'ABOUT 3-1/2 FEET HIGH ON THE SIDE OF THE PARAPET WALL.
 HV4384'
 HV4384'REFERENCE MARK NO.3 IS 14.55 FEET W OF STATION MARK ALSO SET
 HV4384'FLUSH IN THE BRICK PARAPET WALL, ABOUT 3 FEET ABOVE THE TILE FLOOR
 HV4384'(ALSO INCLINED DISTANCE).  PREVIOUS DESCRIPTIONS CHECKED VERY
 HV4384'CLOSELY THROUGHOUT.  SEVERAL OUTS WERE TAKEN WHICH CAN BE USED FOR
 HV4384'AZIMUTH MARKS.
 HV4384
 HV4384                          STATION RECOVERY (1935)
 HV4384
 HV4384'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4384'THE STATION MARK AND TWO REFERENCE MARKS WERE RECOVERED IN GOOD
 HV4384'CONDITION.
 HV4384'
 HV4384'THE STATION IS ON THE OLD WATER TOWER AT THE RENO PUMPING
 HV4384'STATION.  THIS TOWER IS THE WESTERLY ONE OF TWO AND IS FLAT-TOPPED.
 HV4384'
 HV4384'THE STATION IS MARKED BY A STANDARD DISK SET IN THE TOP OF A
 HV4384'SQUARE CONCRETE BLOCK, STAMPED RENO 1917 1933.
 HV4384'
 HV4384'REFERENCE MARK NO.2 IS 18.53 FEET S OF THE STATION, SLOPE DISTANCE,
 HV4384'SET IN THE VERTICAL SIDE OF THE BRICK PARAPET ABOUT 3-1/2 FEET
 HV4384'ABOVE THE TOP OF THE TOWER.
 HV4384'
 HV4384'REFERENCE MARK NO.3 IS 14.55 FEET, SLOPE DISTANCE, W OF THE
 HV4384'STATION, ALSO SET IN THE SIDE OF THE PARAPET 3 FEET ABOVE THE TOP
 HV4384'OF THE TOWER.
 HV4384'
 HV4384'IT MAY BE REACHED BY EITHER WISCONSIN OR CONNECTICUT AVENUES AND
 HV4384'FESSENDEN STREET.
 HV4384
 HV4384                          STATION RECOVERY (1956)
 HV4384
 HV4384'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956 (MLC)
 HV4384'THE STATION AND REFERENCE MARKS WERE RECOVERED.  THE ORIGINAL
 HV4384'DESCRIPTIONS ARE GOOD.  THE DISTANCES TO ALL THE REFERENCE MARKS
 HV4384'CHECKED VERY CLOSELY.
 HV4384'
 HV4384'THE STATION MARK IS A CONCRETE BLOCK PROJECTING ABOUT 3 IN.  IT
 HV4384'(THE MARK) IS STAMPED RENO 1917 1933, AND IS A STANDARD DISK.
 HV4384
 HV4384                          STATION RECOVERY (1960)
 HV4384
 HV4384'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4384'THIS STATION WAS RECOVERED ALONG WITH BOTH REFERENCE
 HV4384'MARKS.  DESCRIPTION GOOD.
 HV4384'
 HV4384'NOTE--SEVERAL METAL POLES APPROXIMATELY 3 INCHES IN DIAMETER HAVE
 HV4384'BEEN BUILT AROUND THE TOWER AND COULD OBSTRUCT THE LINE OF SIGHT IN
 HV4384'SOME DIRECTIONS.
 HV4384
 HV4384                          STATION RECOVERY (1969)
 HV4384
 HV4384'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1969 (JBJ)
 HV4384'THE STATION MARK, REFERENCE MARKS 1 AND 2 WERE RECOVERED AS
 HV4384'DESCRIBED IN 1956.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4385 ***********************************************************************
 HV4385  DESIGNATION -  RENO STANDPIPE
 HV4385  PID         -  HV4385
 HV4385  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4385  COUNTRY     -  US
 HV4385  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4385
 HV4385                         *CURRENT SURVEY CONTROL
 HV4385  ______________________________________________________________________
 HV4385* NAD 83(1993) POSITION- 38 57 09.34120(N) 077 04 36.89771(W)   ADJUSTED
 HV4385  ______________________________________________________________________
 HV4385  GEOID HEIGHT    -        -31.935 (meters)                     GEOID18
 HV4385  LAPLACE CORR    -         -2.72  (seconds)                    DEFLEC18
 HV4385  HORZ ORDER      -  THIRD
 HV4385
 HV4385.The horizontal coordinates were established by classical geodetic methods
 HV4385.and adjusted by the National Geodetic Survey in November 1994.
 HV4385
 HV4385.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4385.GEOID18 height accuracy estimate available here.
 HV4385
 HV4385.Click photographs - Photos may exist for this station.
 HV4385
 HV4385.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4385
 HV4385. The following values were computed from the NAD 83(1993) position.
 HV4385
 HV4385;                    North         East     Units Scale Factor Converg.
 HV4385;SPC MD       -   142,746.580   393,332.926   MT  0.99995074   -0 02 53.8
 HV4385;SPC MD       -   468,327.74  1,290,459.77   sFT  0.99995074   -0 02 53.8
 HV4385;SPC VA N     - 2,143,694.774 3,623,349.662   MT  0.99996545   +0 53 17.4
 HV4385;SPC VA N     - 7,033,105.27 11,887,606.35   sFT  0.99996545   +0 53 17.4
 HV4385;UTM  18      - 4,313,567.182   320,027.906   MT  0.99999885   -1 18 21.8
 HV4385
 HV4385_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2002713567(NAD 83)
 HV4385
 HV4385                          SUPERSEDED SURVEY CONTROL
 HV4385
 HV4385  NAD 83(1991)-  38 57 09.34039(N)    077 04 36.89875(W) AD(       ) 3
 HV4385  NAD 83(1986)-  38 57 09.33993(N)    077 04 36.90881(W) AD(       ) 3
 HV4385  NAD 27      -  38 57 08.94212(N)    077 04 37.99423(W) AD(       ) 3
 HV4385
 HV4385.Superseded values are not recommended for survey control.
 HV4385
 HV4385.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4385.See file dsdata.pdf to determine how the superseded data were derived.
 HV4385
 HV4385_MARKER: 52 = STANDPIPE TANK
 HV4385_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4385+SATELLITE: SATELLITE OBSERVATIONS - March 15, 2012
 HV4385
 HV4385  HISTORY     - Date     Condition        Report By
 HV4385  HISTORY     - 1934     FIRST OBSERVED   CGS
 HV4385  HISTORY     - 19950605 GOOD             USPSQD
 HV4385  HISTORY     - 20120315 GOOD             GEOCAC
 HV4385
 HV4385                          STATION DESCRIPTION
 HV4385
 HV4385'NO DESCRIPTIVE TEXT AVAILABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1824 ***********************************************************************
 HV1824  DESIGNATION -  RES
 HV1824  PID         -  HV1824
 HV1824  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1824  COUNTRY     -  US
 HV1824  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1824
 HV1824                         *CURRENT SURVEY CONTROL
 HV1824  ______________________________________________________________________
 HV1824* NAD 83(1993) POSITION- 38 54 44.49083(N) 077 05 42.64265(W)   ADJUSTED
 HV1824* NAVD 88 ORTHO HEIGHT -    45.45  (+/-2cm)      149.1   (feet) VERTCON3
 HV1824  ______________________________________________________________________
 HV1824  GEOID HEIGHT    -        -31.967 (meters)                     GEOID18
 HV1824  LAPLACE CORR    -         -2.48  (seconds)                    DEFLEC18
 HV1824  HORZ ORDER      -  SECOND
 HV1824  VERT ORDER      -  ? (See Below)
 HV1824
 HV1824.The horizontal coordinates were established by classical geodetic methods
 HV1824.and adjusted by the National Geodetic Survey in November 1994.
 HV1824
 HV1824.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1824.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1824
 HV1824.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1824.GEOID18 height accuracy estimate available here.
 HV1824
 HV1824.The vertical order pertains to the NGVD 29 superseded value.
 HV1824
 HV1824.Click photographs - Photos may exist for this station.
 HV1824
 HV1824.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1824
 HV1824. The following values were computed from the NAD 83(1993) position.
 HV1824
 HV1824;                    North         East     Units Scale Factor Converg.
 HV1824;SPC MD       -   138,281.506   391,745.280   MT  0.99995005   -0 03 35.1
 HV1824;SPC MD       -   453,678.57  1,285,250.97   sFT  0.99995005   -0 03 35.1
 HV1824;SPC VA N     - 2,139,204.288 3,621,835.184   MT  0.99996159   +0 52 36.4
 HV1824;SPC VA N     - 7,018,372.73 11,882,637.60   sFT  0.99996159   +0 52 36.4
 HV1824;UTM  18      - 4,309,137.786   318,342.585   MT  1.00000636   -1 18 59.1
 HV1824
 HV1824!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1824!SPC MD       -   0.99999789  x   0.99995005  =   0.99994794
 HV1824!SPC VA N     -   0.99999789  x   0.99996159  =   0.99995948
 HV1824!UTM  18      -   0.99999789  x   1.00000636  =   1.00000425
 HV1824
 HV1824:                Primary Azimuth Mark                     Grid Az
 HV1824:SPC MD       -  CATHOLIC CHURCH SPIRE                    003 33 04.3
 HV1824:SPC VA N     -  CATHOLIC CHURCH SPIRE                    002 36 52.8
 HV1824:UTM  18      -  CATHOLIC CHURCH SPIRE                    004 48 28.3
 HV1824
 HV1824_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1834209137(NAD 83)
 HV1824
 HV1824|---------------------------------------------------------------------|
 HV1824| PID    Reference Object                     Distance      Geod. Az  |
 HV1824|                                                           dddmmss.s |
 HV1824| HV3993 CATHOLIC CHURCH SPIRE               430.978 METERS 0032929.2 |
 HV1824| HV4375 RESERVOIR SCHOOL FLAGSTAFF          APPROX. 0.5 KM 1322333.1 |
 HV1824| HV1823 VOIR                                448.330 METERS 1334619.5 |
 HV1824| HV1182 LEDGE                               APPROX. 0.6 KM 1884541.0 |
 HV1824| HV1457 LOW                                 476.676 METERS 2453803.7 |
 HV1824|---------------------------------------------------------------------|
 HV1824
 HV1824                          SUPERSEDED SURVEY CONTROL
 HV1824
 HV1824  NAD 83(1991)-  38 54 44.48963(N)    077 05 42.64427(W) AD(       ) 2
 HV1824  NAD 83(1986)-  38 54 44.48950(N)    077 05 42.65417(W) AD(       ) 2
 HV1824  NAD 27      -  38 54 44.08800(N)    077 05 43.72600(W) AD(       ) 2
 HV1824  USSD        -  38 54 44.42600(N)    077 05 43.55800(W) AD(       ) 3
 HV1824  NGVD 29              45.67   (m)          149.8    (f) LEVELING    3  
 HV1824  NGVD 29 (11/26/84)   45.675  (m)          149.85   (f) ADJUSTED       
 HV1824
 HV1824.Superseded values are not recommended for survey control.
 HV1824
 HV1824.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1824.See file dsdata.pdf to determine how the superseded data were derived.
 HV1824
 HV1824_MARKER: DS = TRIANGULATION STATION DISK
 HV1824_SETTING: 80 = SET IN A BOULDER
 HV1824_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1824+STABILITY: SURFACE MOTION
 HV1824
 HV1824  HISTORY     - Date     Condition        Report By
 HV1824  HISTORY     - 1913     MONUMENTED       CGS
 HV1824  HISTORY     - 1925     GOOD             CGS
 HV1824  HISTORY     - 1925     GOOD             CGS
 HV1824  HISTORY     - 1940     GOOD             CGS
 HV1824  HISTORY     - 1947     GOOD             CGS
 HV1824  HISTORY     - 1947     GOOD             CGS
 HV1824  HISTORY     - 1972     MARK NOT FOUND   NGS
 HV1824
 HV1824                          STATION DESCRIPTION
 HV1824
 HV1824'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV1824'STATION IS ON THE SW BANK OF THE TWIN RESERVOIR IN GEORGETOWN.
 HV1824'THERE IS AN IRON FENCE AROUND THE TOP OF THE BANK WITH AN ANGLE
 HV1824'ABOUT 300 METERS SE OF THE N CORNER.  THE IRON POSTS OF THIS
 HV1824'FENCE ARE SET IN CONCRETE POSTS WITH THEIR TOPS ABOUT LEVEL
 HV1824'WITH THE GROUND.  THE ANGLE OF THE FENCE IS NW OF THE
 HV1824'STATION SOME 50 METERS.  THE PERPENDICULAR TO THE FENCE FROM
 HV1824'THE STATION IS 1.35 METERS AND THE NEAREST POST IS DISTANT
 HV1824'1.70 METERS FROM THE STATION AND AT AN ANGLE ABOUT 5 DEGREES
 HV1824'TO RIGHT OF THE CATHOLIC CHURCH.
 HV1824'
 HV1824'STATION IS MARKED BY A 3/4-INCH DRILL HOLE SURROUNDED BY A
 HV1824'TRIANGLE CUT IN A LARGE BOULDER SET WITH ITS TOP ABOUT 15
 HV1824'INCHES BELOW THE SURFACE OF THE GROUND AND A REGULAR C. AND G.S.
 HV1824'STATION MARK SET IN THE TOP OF A LARGE BOULDER SLIGHTLY ABOVE
 HV1824'THE SURFACE OF THE GROUND.
 HV1824
 HV1824                          STATION RECOVERY (1925)
 HV1824
 HV1824'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1925 (GLB)
 HV1824'THE STATION WAS FOUND AS DESCRIBED.
 HV1824
 HV1824                          STATION RECOVERY (1925)
 HV1824
 HV1824'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1925
 HV1824'AT WASHINGTON.
 HV1824'AT WASHINGTON, ON MAC ARTHUR BOULEVARD NORTHWEST, ON THE
 HV1824'TWIN-RESERVOIR GROUNDS, ABOUT 160 YARDS NORTHWEST OF THE
 HV1824'CENTERLINE OF THE DIVISION BETWEEN THE RESERVOIRS, 150 FEET
 HV1824'SOUTHEAST OF A CURVE IN THE BANK, 12 FEET SOUTHWEST OF THE ROCK
 HV1824'REVETMENT OF THE RESERVOIR BASIN, 9 FEET NORTHEAST OF THE EDGE
 HV1824'OF THE EMBANKMENT, IN THE TOP OF A BOULDER, AND 0.4 FOOT UNDER
 HV1824'GROUND.  A STANDARD TRIANGULATION-STATION DISK.
 HV1824
 HV1824                          STATION RECOVERY (1940)
 HV1824
 HV1824'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV1824'THE STATION WAS RECOVERED.  IT IS ABOUT 160 YARDS NW OF THE CENTER
 HV1824'LINE OF THE DIVISION BETWEEN THE TWIN RESERVOIRS, AND IS 34.4
 HV1824'METERS SE OF THE ANGLE IN THE FENCE WHICH IS ABOUT 200 METERS
 HV1824'SE OF THE NW CORNER OF THE DISTRIBUTING RESERVOIR.  THE MARK
 HV1824'IS 3.7 METERS SW OF THE ROCK REVETMENT OF THE RESERVOIR
 HV1824'BASIN, 2.7 METERS NE OF THE EDGE OF THE EMBANKMENT, AND 0.75
 HV1824'METER SW OF THE WIRE FENCE WHICH IS HUNG ON THE SW SIDE OF
 HV1824'CONCRETE FENCE POSTS (4 BY 4 INCHES BY 4-1/2 FEET).  THIS IS
 HV1824'A DIFFERENT FENCE FROM THE ONE IN 1913.  THE DISK IS
 HV1824'COUNTERSUNK IN A ROCK, IS ABOUT 2 INCHES BELOW THE GROUND
 HV1824'SURFACE, AND IS NOT STAMPED.
 HV1824
 HV1824                          STATION RECOVERY (1947)
 HV1824
 HV1824'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947 (RMB)
 HV1824'STATION RECOVERED IN GOOD CONDITION.  THE FENCE REFERRED TO
 HV1824'IN THE PREVIOUS DESCRIPTIONS HAS BEEN MOVED ABOUT 100 YARDS
 HV1824'FROM THE BANK.
 HV1824
 HV1824                          STATION RECOVERY (1947)
 HV1824
 HV1824'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947
 HV1824'RECOVERED IN GOOD CONDITION.
 HV1824
 HV1824                          STATION RECOVERY (1972)
 HV1824
 HV1824'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1972 (RDO)
 HV1824'THE STATION WAS SEARCHED FOR BUT NOT RECOVERED.  A COMPACTED
 HV1824'LAYER OF NEW ROAD GRAVEL SEEMS TO HAVE COVERED THE STATION AND
 HV1824'RENDERS DIGGING FOR IT DIFFICULT, THOUGH EVIDENCE DOES NOT
 HV1824'NECESSARILY INDICATE THAT THE STATION MAY BE DESTROYED.
 HV1824'
 HV1824'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV1824'IN D.C.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1278 ***********************************************************************
 HV1278  DESIGNATION -  RIVET BORR
 HV1278  PID         -  HV1278
 HV1278  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1278  COUNTRY     -  US
 HV1278  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1278
 HV1278                         *CURRENT SURVEY CONTROL
 HV1278  ______________________________________________________________________
 HV1278* NAD 83(1986) POSITION- 38 55 18.     (N) 076 59 45.     (W)   SCALED
 HV1278* NAVD 88 ORTHO HEIGHT -    35.058 (meters)      115.02  (feet) ADJUSTED
 HV1278  ______________________________________________________________________
 HV1278  GEOID HEIGHT    -        -32.085 (meters)                     GEOID18
 HV1278  DYNAMIC HEIGHT  -         35.039 (meters)      114.96  (feet) COMP
 HV1278  MODELED GRAVITY -    980,107.5   (mgal)                       NAVD 88
 HV1278
 HV1278  VERT ORDER      -  FIRST     CLASS I
 HV1278
 HV1278.The horizontal coordinates were scaled from a map and have
 HV1278.an estimated accuracy of +/- 6 seconds.
 HV1278
 HV1278.The orthometric height was determined by differential leveling and
 HV1278.adjusted by the NATIONAL GEODETIC SURVEY
 HV1278.in June 1991.
 HV1278
 HV1278.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1278.GEOID18 height accuracy estimate available here.
 HV1278
 HV1278.Click photographs - Photos may exist for this station.
 HV1278
 HV1278.The dynamic height is computed by dividing the NAVD 88
 HV1278.geopotential number by the normal gravity value computed on the
 HV1278.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1278.degrees latitude (g = 980.6199 gals.).
 HV1278
 HV1278.The modeled gravity was interpolated from observed gravity values.
 HV1278
 HV1278
 HV1278_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ269099(NAD 83)
 HV1278
 HV1278                          SUPERSEDED SURVEY CONTROL
 HV1278
 HV1278  NGVD 29 (11/26/84)   35.285  (m)          115.76   (f) ADJUSTED    1 1
 HV1278
 HV1278.Superseded values are not recommended for survey control.
 HV1278
 HV1278.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1278.See file dsdata.pdf to determine how the superseded data were derived.
 HV1278
 HV1278_MARKER: R = RIVET
 HV1278_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1278_SP_SET: GUARDRAIL FOUNDATION
 HV1278_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1278
 HV1278  HISTORY     - Date     Condition        Report By
 HV1278  HISTORY     - UNK      MONUMENTED       BORR
 HV1278  HISTORY     - 1971     GOOD             NGS
 HV1278
 HV1278                          STATION DESCRIPTION
 HV1278
 HV1278'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1278'AT WASHINGTON.
 HV1278'AT WASHINGTON, D.C., AT THE SUBDIVISION OF BROOKLAND, SET IN
 HV1278'THE TOP OF THE NORTH END OF THE CONCRETE FOUNDATION FOR THE EAST
 HV1278'GUARDRAIL ON THE BALTIMORE AND OHIO RAILROAD OVERPASS FOR U.S.
 HV1278'HIGHWAY 1 (RHODE ISLAND AVENUE), 156 FEET NORTH OF TOWER QN, 10
 HV1278'FEET EAST OF THE CENTER LINE OF THE EAST TRACK, AND ABOUT 1 FOOT
 HV1278'ABOVE THE LEVEL OF THE TRACK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1871 ***********************************************************************
 HV1871  DESIGNATION -  RM 3=TIDAL BM USGS
 HV1871  PID         -  HV1871
 HV1871  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1871  COUNTRY     -  US
 HV1871  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1871
 HV1871                         *CURRENT SURVEY CONTROL
 HV1871  ______________________________________________________________________
 HV1871* NAD 83(1986) POSITION- 38 54 08.     (N) 077 03 43.     (W)   SCALED
 HV1871* NAVD 88 ORTHO HEIGHT -     6.87  (+/-2cm)       22.5   (feet) VERTCON3
 HV1871  ______________________________________________________________________
 HV1871  GEOID HEIGHT    -        -32.031 (meters)                     GEOID18
 HV1871  VERT ORDER      -  ? (See Below)
 HV1871
 HV1871.The horizontal coordinates were scaled from a map and have
 HV1871.an estimated accuracy of +/- 6 seconds.
 HV1871
 HV1871.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1871.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1871
 HV1871.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1871.GEOID18 height accuracy estimate available here.
 HV1871
 HV1871.The vertical order pertains to the NGVD 29 superseded value.
 HV1871
 HV1871.Click photographs - Photos may exist for this station.
 HV1871
 HV1871
 HV1871_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ211079(NAD 83)
 HV1871
 HV1871                          SUPERSEDED SURVEY CONTROL
 HV1871
 HV1871  NGVD 29 (11/26/84)    7.109  (m)           23.32   (f) ADJUSTED       
 HV1871
 HV1871.Superseded values are not recommended for survey control.
 HV1871
 HV1871.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1871.See file dsdata.pdf to determine how the superseded data were derived.
 HV1871
 HV1871_MARKER: B = BOLT
 HV1871_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1871_SP_SET: FOUNDATION
 HV1871_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1871
 HV1871  HISTORY     - Date     Condition        Report By
 HV1871  HISTORY     - UNK      MONUMENTED       USGS
 HV1871  HISTORY     - 1941     GOOD             CGS
 HV1871  HISTORY     - 1947     GOOD             CGS
 HV1871
 HV1871                          STATION DESCRIPTION
 HV1871
 HV1871'DESCRIBED BY COAST AND GEODETIC SURVEY 1941
 HV1871'AT GEORGETOWN.
 HV1871'AT GEORGETOWN, WASHINGTON D.C., ON THE NORTH SIDE OF K STREET
 HV1871'NORTHWEST BETWEEN WISCONSIN AVENUE AND THIRTY-FIRST STREET, AT
 HV1871'THE DISTRICT OF COLUMBIA INCINERATOR PLANT, IN THE SOUTH FACE OF
 HV1871'THE FOUNDATION OF THE STACK, 3.3 FEET BELOW THE TOP OF THE GRANITE
 HV1871'FACING, 2.1 FEET WEST OF THE EAST CORNER OF THE FOUNDATION, AND
 HV1871'IN A JOINT OF THE FACING.  A HORIZONTAL HAIRLINE ON THE END OF
 HV1871'A 1/2-INCH COPPER BOLT.
 HV1871
 HV1871                          STATION RECOVERY (1947)
 HV1871
 HV1871'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947
 HV1871'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4441 ***********************************************************************
 HV4441  DESIGNATION -  RR
 HV4441  PID         -  HV4441
 HV4441  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4441  COUNTRY     -  US
 HV4441  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4441
 HV4441                         *CURRENT SURVEY CONTROL
 HV4441  ______________________________________________________________________
 HV4441* NAD 83(1993) POSITION- 38 52 35.01569(N) 077 02 08.50220(W)   ADJUSTED
 HV4441* NAVD 88 ORTHO HEIGHT -     1.425 (meters)        4.68  (feet) ADJUSTED
 HV4441  ______________________________________________________________________
 HV4441  GEOID HEIGHT    -        -32.113 (meters)                     GEOID18
 HV4441  LAPLACE CORR    -         -2.77  (seconds)                    DEFLEC18
 HV4441  DYNAMIC HEIGHT  -          1.424 (meters)        4.67  (feet) COMP
 HV4441  MODELED GRAVITY -    980,096.8   (mgal)                       NAVD 88
 HV4441
 HV4441  HORZ ORDER      -  SECOND
 HV4441  VERT ORDER      -  FIRST     CLASS II
 HV4441
 HV4441.The horizontal coordinates were established by classical geodetic methods
 HV4441.and adjusted by the National Geodetic Survey in November 1994.
 HV4441
 HV4441.The orthometric height was determined by differential leveling and
 HV4441.adjusted by the NATIONAL GEODETIC SURVEY
 HV4441.in April 2010.
 HV4441
 HV4441.No vertical observational check was made to the station.
 HV4441
 HV4441.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4441.GEOID18 height accuracy estimate available here.
 HV4441
 HV4441.Click photographs - Photos may exist for this station.
 HV4441
 HV4441.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4441
 HV4441.The dynamic height is computed by dividing the NAVD 88
 HV4441.geopotential number by the normal gravity value computed on the
 HV4441.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV4441.degrees latitude (g = 980.6199 gals.).
 HV4441
 HV4441.The modeled gravity was interpolated from observed gravity values.
 HV4441
 HV4441. The following values were computed from the NAD 83(1993) position.
 HV4441
 HV4441;                    North         East     Units Scale Factor Converg.
 HV4441;SPC MD       -   134,285.374   396,902.648   MT  0.99994985   -0 01 20.7
 HV4441;SPC MD       -   440,567.93  1,302,171.44   sFT  0.99994985   -0 01 20.7
 HV4441;SPC VA N     - 2,135,292.935 3,627,057.224   MT  0.99995857   +0 54 50.0
 HV4441;SPC VA N     - 7,005,540.24 11,899,770.24   sFT  0.99995857   +0 54 50.0
 HV4441;UTM  18      - 4,305,029.369   323,411.340   MT  0.99998400   -1 16 40.9
 HV4441
 HV4441!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4441!SPC MD       -   1.00000481  x   0.99994985  =   0.99995466
 HV4441!SPC VA N     -   1.00000481  x   0.99995857  =   0.99996338
 HV4441!UTM  18      -   1.00000481  x   0.99998400  =   0.99998881
 HV4441
 HV4441:                Primary Azimuth Mark                     Grid Az
 HV4441:SPC MD       -  RS 2                                     244 01 15.3
 HV4441:SPC VA N     -  RS 2                                     243 05 04.6
 HV4441:UTM  18      -  RS 2                                     245 16 35.5
 HV4441
 HV4441_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2341105029(NAD 83)
 HV4441
 HV4441|---------------------------------------------------------------------|
 HV4441| PID    Reference Object                     Distance      Geod. Az  |
 HV4441|                                                           dddmmss.s |
 HV4441| HV4610 SIGNAL TOWER                        APPROX. 1.0 KM 2190151.6 |
 HV4441| HV4642 RS 2                                APPROX. 0.9 KM 2435954.6 |
 HV4441| HV4438 TB 1913                             447.264 METERS 3094837.2 |
 HV4441|---------------------------------------------------------------------|
 HV4441
 HV4441                          SUPERSEDED SURVEY CONTROL
 HV4441
 HV4441  NAD 83(1991)-  38 52 35.01435(N)    077 02 08.50361(W) AD(       ) 2
 HV4441  NAD 83(1986)-  38 52 35.01408(N)    077 02 08.51439(W) AD(       ) 2
 HV4441  NAD 27      -  38 52 34.61400(N)    077 02 09.59000(W) AD(       ) 2
 HV4441  USSD        -  38 52 34.95100(N)    077 02 09.42100(W) AD(       ) 3
 HV4441
 HV4441.Superseded values are not recommended for survey control.
 HV4441
 HV4441.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4441.See file dsdata.pdf to determine how the superseded data were derived.
 HV4441
 HV4441_MARKER: H = DRILL HOLE
 HV4441_SETTING: 0 = UNSPECIFIED SETTING
 HV4441_SP_SET: RAILROAD BRIDGE FOUNDATION
 HV4441_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV4441_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV4441+SATELLITE: SATELLITE OBSERVATIONS - December 22, 2008
 HV4441
 HV4441  HISTORY     - Date     Condition        Report By
 HV4441  HISTORY     - 1913     MONUMENTED       USACE
 HV4441  HISTORY     - 1924     GOOD             CGS
 HV4441  HISTORY     - 1928     SEE DESCRIPTION  MDGS
 HV4441  HISTORY     - 1940     GOOD             CGS
 HV4441  HISTORY     - 1946     GOOD             CGS
 HV4441  HISTORY     - 1953     GOOD             CGS
 HV4441  HISTORY     - 1971     GOOD             NGS
 HV4441  HISTORY     - 20070928 GOOD             NGS
 HV4441  HISTORY     - 20081222 GOOD             NGS
 HV4441
 HV4441                          STATION DESCRIPTION
 HV4441
 HV4441'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1913 (OBF)
 HV4441'STATION IS A DRILL HOLE IN SEA WALL SOME 100 METERS S OF
 HV4441'RAILROAD ON RIVER SIDE OF POTOMAC PARK.  DISTANT 238 METERS
 HV4441'FROM NORTHWEST BASE.
 HV4441
 HV4441                          STATION RECOVERY (1924)
 HV4441
 HV4441'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1924 (EWE)
 HV4441'STATION WAS RECOVERED AS DESCRIBED.
 HV4441
 HV4441                          STATION RECOVERY (1928)
 HV4441
 HV4441'RECOVERY NOTE BY MARYLAND GEODETIC SURVEY 1928
 HV4441'BRONZE DISK MARKED PUBLIC BUILDINGS AND PUBLIC PARKS.  MARKED
 HV4441'AS FOLLOWS--LETTERS CHISELED ON STONE OF WALL, R.R. LOOK MORE
 HV4441'LIKE KK AND E LOOKS MORE LIKE F AS A RESULT OF WEATHERING AND
 HV4441'CHIPPING OF ROCK.
 HV4441
 HV4441                          STATION RECOVERY (1940)
 HV4441
 HV4441'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV4441'STATION WAS RECOVERED.  AT THE SITE OF THIS STATION THERE IS
 HV4441'NOW A PUBLIC BUILDINGS AND PUBLIC PARKS TRIANGULATION STATION DISK,
 HV4441'UNSTAMPED, SET FLUSH IN THE SURFACE OF A CONCRETE SIDEWALK WHICH
 HV4441'IS NOW LAID OVER THE SEA WALL.  THERE IS NO LETTERING CHISELED
 HV4441'IN THE WALL AS DESCRIBED IN THE 1928 RECOVERY NOTE AND IT IS
 HV4441'BELIEVED THAT THE WALK HAS BEEN BUILT SINCE 1928 THUS COVERING
 HV4441'THE OLD MARK AND LETTERS.  THE GEOGRAPHIC POSITION OF THIS DISK
 HV4441'AS DETERMINED FROM MEASUREMENTS MADE BY THE U.S.E. AGREES WITH
 HV4441'THE POSITION OF R.R., SO APPARENTLY THE POSITION OF THE OLD
 HV4441'STATION HAS BEEN PRESERVED BY THE PUBLIC BUILDINGS AND
 HV4441'PUBLIC PARKS.
 HV4441'
 HV4441'THE MARK IS 2.6 FEET IN FROM THE OUTER EDGE OF THE SEA WALL.
 HV4441'IT IS USED AS A REFERENCE MARK FOR STATION WALK, U.S.E., WHICH
 HV4441'IS A BRASS TUBE LEADED IN THE CENTER OF THE SIDEWALK 85.66 FEET
 HV4441'UPSTREAM FROM THIS STATION.
 HV4441
 HV4441                          STATION RECOVERY (1946)
 HV4441
 HV4441'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4441'STATION RECOVERED AS DESCRIBED AND FOUND TO BE IN GOOD CONDITION.
 HV4441'DESCRIPTION IS ADEQUATE.
 HV4441
 HV4441                          STATION RECOVERY (1953)
 HV4441
 HV4441'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1953 (JHB)
 HV4441'STATION IS MARKED BY A PUBLIC BUILDINGS AND PUBLIC PARKS
 HV4441'TRIANGULATION-STATION DISK, AS PREVIOUSLY PUBLISHED.
 HV4441
 HV4441                          STATION RECOVERY (1971)
 HV4441
 HV4441'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4441'THE STATION WAS RECOVERED AS DESCRIBED SET IN SIDEWALK 2.6
 HV4441'FEET NORTHEAST FROM THE OUTEREDGE OF THE SEAWALL AND 305.0 FEET
 HV4441'SOUTHEAST OF THE SOUTH FACE OF RAILROAD BRIDGE.  THE DESCRIPTION
 HV4441'IS ADEQUATE.
 HV4441'
 HV4441'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--DIST. OF COL.
 HV4441
 HV4441                          STATION RECOVERY (2007)
 HV4441
 HV4441'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2007 (DRD)
 HV4441'RECOVERED IN GOOD CONDITION.
 HV4441
 HV4441                          STATION RECOVERY (2008)
 HV4441
 HV4441'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV4441'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7993 ***********************************************************************
 HV7993  DESIGNATION -  RS
 HV7993  PID         -  HV7993
 HV7993  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7993  COUNTRY     -  US
 HV7993  USGS QUAD   -  WASHINGTON WEST (2016)
 HV7993
 HV7993                         *CURRENT SURVEY CONTROL
 HV7993  ______________________________________________________________________
 HV7993* NAD 83(1986) POSITION- 38 53 46.74   (N) 077 02 13.12   (W)   HD_HELD1
 HV7993* NAVD 88 ORTHO HEIGHT -    10.916 (meters)       35.81  (feet) ADJUSTED
 HV7993  ______________________________________________________________________
 HV7993  GEOID HEIGHT    -        -32.072 (meters)                     GEOID18
 HV7993  DYNAMIC HEIGHT  -         10.910 (meters)       35.79  (feet) COMP
 HV7993  MODELED GRAVITY -    980,097.6   (mgal)                       NAVD 88
 HV7993
 HV7993  VERT ORDER      -  FIRST     CLASS II
 HV7993
 HV7993.The horizontal coordinates were determined by differentially corrected
 HV7993.hand held GPS observations or other comparable positioning techniques
 HV7993.and have an estimated accuracy of +/- 3 meters.
 HV7993
 HV7993.The orthometric height was determined by differential leveling and
 HV7993.adjusted by the NATIONAL GEODETIC SURVEY
 HV7993.in May 1999.
 HV7993
 HV7993.No vertical observational check was made to the station.
 HV7993
 HV7993.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7993.GEOID18 height accuracy estimate available here.
 HV7993
 HV7993.Click photographs - Photos may exist for this station.
 HV7993
 HV7993.The dynamic height is computed by dividing the NAVD 88
 HV7993.geopotential number by the normal gravity value computed on the
 HV7993.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV7993.degrees latitude (g = 980.6199 gals.).
 HV7993
 HV7993.The modeled gravity was interpolated from observed gravity values.
 HV7993
 HV7993
 HV7993_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2334907243(NAD 83)
 HV7993
 HV7993                          SUPERSEDED SURVEY CONTROL
 HV7993
 HV7993  NAVD 88 (06/15/91)   10.914  (m)           35.81   (f) SUPERSEDED  1 0
 HV7993  NGVD 29 (08/12/92)   11.147  (m)           36.57   (f) ADJUSTED    1 0
 HV7993  NGVD 29 (??/??/87)   11.147  (m)           36.57   (f) SUPERSEDED  1 0
 HV7993
 HV7993.Superseded values are not recommended for survey control.
 HV7993
 HV7993.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7993.See file dsdata.pdf to determine how the superseded data were derived.
 HV7993
 HV7993_MARKER: F = FLANGE-ENCASED ROD
 HV7993_SETTING: 59 = STAINLESS STEEL ROD IN SLEEVE (10 FT.+)
 HV7993_STAMPING: RS
 HV7993_MARK LOGO: NGS
 HV7993_PROJECTION: FLUSH
 HV7993_MAGNETIC: I = MARKER IS A STEEL ROD
 HV7993_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV7993
 HV7993  HISTORY     - Date     Condition        Report By
 HV7993  HISTORY     - 1978     MONUMENTED       NGS
 HV7993  HISTORY     - 1982     GOOD             NGS
 HV7993  HISTORY     - 19920615 GOOD             NGS
 HV7993  HISTORY     - 19980928 GOOD             NGS
 HV7993  HISTORY     - 20081222 GOOD             NGS
 HV7993  HISTORY     - 201203   GOOD             NGS
 HV7993
 HV7993                          STATION DESCRIPTION
 HV7993
 HV7993'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV7993'IN WASHINGTON DC.
 HV7993'THE MARK IS 1 FT BELOW DRIVEWAY.
 HV7993'SET IN THE SOUTH LAWN OF THE WHITE HOUSE, ABOUT 500 FEET SOUTH OF THE
 HV7993'SOUTHWEST CORNER OF THE WHITE HOUSE, ABOUT 165 FEET EAST OF THE
 HV7993'SOUTHWEST GATE, 18 FEET SOUTH OF THE SOUTH EDGE OF A PAVED DRIVEWAY,
 HV7993'37 FEET EAST-SOUTHEAST OF A LAMP POLE, 23.5 FEET WEST OF A 6-INCH
 HV7993'AMERICAN ELM, AND 7 FEET NORTH OF THE NORTHEAST CORNER OF THE
 HV7993'FLAGSTONE PAVING OF THE PATH TO THE CHILDRENS GARDEN.
 HV7993'A STAINLESS STEEL ROD IN SLEEVE SET TO THE DEPTH OF 64 FEET ENCASED
 HV7993'IN A PIPE FLUSH WITH THE GROUND.
 HV7993
 HV7993                          STATION RECOVERY (1982)
 HV7993
 HV7993'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV7993'RECOVERED IN GOOD CONDITION.
 HV7993
 HV7993                          STATION RECOVERY (1992)
 HV7993
 HV7993'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV7993'IN WASHINGTON, D.C., IN THE SOUTH LAWN OF THE WHITE HOUSE, 152.4 M
 HV7993'(500.0 FT) SOUTH OF THE SOUTHWEST CORNER OF THE BUILDING, 50.3 M
 HV7993'(165.0 FT) EAST OF THE SOUTHWEST GATE, 11.3 M (37.1 FT)
 HV7993'EAST-SOUTHEAST OF A LAMP POLE, 7.2 M (23.6 FT) WEST OF A 6-INCH
 HV7993'AMERICAN ELM TREE, 5.5 M (18.0 FT) SOUTH OF THE SOUTH EDGE OF A PAVED
 HV7993'DRIVEWAY, AND 2.2 M (7.2 FT)  NORTH OF THE NORTHEAST CORNER OF THE
 HV7993'FLAGSTONE PAVING OF A PATH TO THE CHILDRENS GARDEN.
 HV7993'ACCORDING TO THE 1978 DESCRIPTION--A STAINLESS STEEL ROD IN SLEEVE
 HV7993'SET TO THE DEPTH OF 64 FEET ENCASED IN A PIPE FLUSH WITH THE GROUND.
 HV7993'(THE DEPTH OF THE SLEEVE WAS NOT REPORTED.)
 HV7993
 HV7993                          STATION RECOVERY (1998)
 HV7993
 HV7993'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1998 (RLA)
 HV7993'RECOVERED AS DESCRIBED.
 HV7993
 HV7993                          STATION RECOVERY (2008)
 HV7993
 HV7993'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV7993'RECOVERED AS DESCRIBED. NOTE--ACCESS TO THE DATUM POINT IS THROUGH A
 HV7993'5-INCH LOGO CAP WHICH IS PARTLY GONE.
 HV7993
 HV7993                          STATION RECOVERY (2012)
 HV7993
 HV7993'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV7993'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4417 ***********************************************************************
 HV4417  DESIGNATION -  RT
 HV4417  PID         -  HV4417
 HV4417  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4417  COUNTRY     -  US
 HV4417  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4417
 HV4417                         *CURRENT SURVEY CONTROL
 HV4417  ______________________________________________________________________
 HV4417* NAD 83(1993) POSITION- 38 52 44.86535(N) 077 03 12.66020(W)   ADJUSTED
 HV4417  ______________________________________________________________________
 HV4417  GEOID HEIGHT    -        -32.083 (meters)                     GEOID18
 HV4417  LAPLACE CORR    -         -2.86  (seconds)                    DEFLEC18
 HV4417  HORZ ORDER      -  THIRD
 HV4417
 HV4417.The horizontal coordinates were established by classical geodetic methods
 HV4417.and adjusted by the National Geodetic Survey in November 1994.
 HV4417
 HV4417.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4417.GEOID18 height accuracy estimate available here.
 HV4417
 HV4417.Click photographs - Photos may exist for this station.
 HV4417
 HV4417.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4417
 HV4417. The following values were computed from the NAD 83(1993) position.
 HV4417
 HV4417;                    North         East     Units Scale Factor Converg.
 HV4417;SPC MD       -   134,589.848   395,356.395   MT  0.99994985   -0 02 00.9
 HV4417;SPC MD       -   441,566.86  1,297,098.44   sFT  0.99994985   -0 02 00.9
 HV4417;SPC VA N     - 2,135,572.103 3,625,506.188   MT  0.99995878   +0 54 10.0
 HV4417;SPC VA N     - 7,006,456.14 11,894,681.55   sFT  0.99995878   +0 54 10.0
 HV4417;UTM  18      - 4,305,367.666   321,872.073   MT  0.99999072   -1 17 21.4
 HV4417
 HV4417_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2187205367(NAD 83)
 HV4417
 HV4417                          SUPERSEDED SURVEY CONTROL
 HV4417
 HV4417  NAD 83(1991)-  38 52 44.86405(N)    077 03 12.66176(W) AD(       ) 3
 HV4417  NAD 83(1986)-  38 52 44.86387(N)    077 03 12.67238(W) AD(       ) 3
 HV4417  NAD 27      -  38 52 44.46200(N)    077 03 13.74900(W) AD(       ) 3
 HV4417  USSD        -  38 52 44.80100(N)    077 03 13.58000(W) AD(       ) 3
 HV4417
 HV4417.Superseded values are not recommended for survey control.
 HV4417
 HV4417.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4417.See file dsdata.pdf to determine how the superseded data were derived.
 HV4417
 HV4417_MARKER: Z = SEE DESCRIPTION
 HV4417_SETTING: 21 = SET IN CONCRETE IN A CLAY TILE PIPE
 HV4417_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4417
 HV4417  HISTORY     - Date     Condition        Report By
 HV4417  HISTORY     - 1913     MONUMENTED       CGS
 HV4417  HISTORY     - 1940     MARK NOT FOUND   CGS
 HV4417
 HV4417                          STATION DESCRIPTION
 HV4417
 HV4417'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4417'STATION IS IN CONCRETE MONUMENT, 8-INCH TERRA COTTA PIPE,
 HV4417'CENTERED WITH 1/4-INCH BRASS PIPE, 0.3 FOOT ABOVE GROUND, ON
 HV4417'HIGH-WATER LINE, 9 FEET NE OF 10-INCH ELM, WITH BLAZED NAIL,
 HV4417'AND 27 FEET NE OF 15-INCH ELM.
 HV4417
 HV4417                          STATION RECOVERY (1940)
 HV4417
 HV4417'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV4417'STATION IS LOST.  THE SITE OF THE STATION HAS RECENTLY BEEN
 HV4417'COVERED WITH A 10-FOOT FILL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4370 ***********************************************************************
 HV4370  DESIGNATION -  RUIN
 HV4370  PID         -  HV4370
 HV4370  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4370  COUNTRY     -  US
 HV4370  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4370
 HV4370                         *CURRENT SURVEY CONTROL
 HV4370  ______________________________________________________________________
 HV4370* NAD 83(1993) POSITION- 38 55 40.51480(N) 077 06 33.24535(W)   ADJUSTED
 HV4370* NAVD 88 ORTHO HEIGHT -    37.    (meters)      121.    (feet) SCALED
 HV4370  ______________________________________________________________________
 HV4370  GEOID HEIGHT    -        -31.929 (meters)                     GEOID18
 HV4370  LAPLACE CORR    -         -2.02  (seconds)                    DEFLEC18
 HV4370  HORZ ORDER      -  THIRD
 HV4370
 HV4370.The horizontal coordinates were established by classical geodetic methods
 HV4370.and adjusted by the National Geodetic Survey in November 1994.
 HV4370
 HV4370.The orthometric height was scaled from a topographic map.
 HV4370
 HV4370.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4370.GEOID18 height accuracy estimate available here.
 HV4370
 HV4370.Click photographs - Photos may exist for this station.
 HV4370
 HV4370.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4370
 HV4370. The following values were computed from the NAD 83(1993) position.
 HV4370
 HV4370;                    North         East     Units Scale Factor Converg.
 HV4370;SPC MD       -   140,010.406   390,528.261   MT  0.99995026   -0 04 06.8
 HV4370;SPC MD       -   459,350.81  1,281,258.14   sFT  0.99995026   -0 04 06.8
 HV4370;SPC VA N     - 2,140,913.087 3,620,590.054   MT  0.99996303   +0 52 04.8
 HV4370;SPC VA N     - 7,023,979.02 11,878,552.54   sFT  0.99996303   +0 52 04.8
 HV4370;UTM  18      - 4,310,893.069   317,163.713   MT  1.00001165   -1 19 32.5
 HV4370
 HV4370!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4370!SPC MD       -   0.99999924  x   0.99995026  =   0.99994950
 HV4370!SPC VA N     -   0.99999924  x   0.99996303  =   0.99996227
 HV4370!UTM  18      -   0.99999924  x   1.00001165  =   1.00001089
 HV4370
 HV4370:                Primary Azimuth Mark                     Grid Az
 HV4370:SPC MD       -  STAFF                                    134 16 59.8
 HV4370:SPC VA N     -  STAFF                                    133 20 48.2
 HV4370:UTM  18      -  STAFF                                    135 32 25.5
 HV4370
 HV4370_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1716310893(NAD 83)
 HV4370
 HV4370|---------------------------------------------------------------------|
 HV4370| PID    Reference Object                     Distance      Geod. Az  |
 HV4370|                                                           dddmmss.s |
 HV4370| HV4371 REFORM SCHOOL TANK                  APPROX. 1.0 KM 0113857.6 |
 HV4370| HV4372 STAFF                               APPROX. 0.6 KM 1341253.0 |
 HV4370| HV3551 YEL                                 464.325 METERS 2501706.8 |
 HV4370|---------------------------------------------------------------------|
 HV4370
 HV4370                          SUPERSEDED SURVEY CONTROL
 HV4370
 HV4370  NAD 83(1991)-  38 55 40.51373(N)    077 06 33.24699(W) AD(       ) 3
 HV4370  NAD 83(1986)-  38 55 40.51344(N)    077 06 33.25703(W) AD(       ) 3
 HV4370  NAD 27      -  38 55 40.11400(N)    077 06 34.32600(W) AD(       ) 3
 HV4370  USSD        -  38 55 40.45300(N)    077 06 34.15700(W) AD(       ) 3
 HV4370
 HV4370.Superseded values are not recommended for survey control.
 HV4370
 HV4370.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4370.See file dsdata.pdf to determine how the superseded data were derived.
 HV4370
 HV4370_MARKER: DS = TRIANGULATION STATION DISK
 HV4370_SETTING: 80 = SET IN A BOULDER
 HV4370_MARK LOGO: CGS
 HV4370_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV4370+STABILITY: SURFACE MOTION
 HV4370
 HV4370  HISTORY     - Date     Condition        Report By
 HV4370  HISTORY     - 1913     MONUMENTED       CGS
 HV4370  HISTORY     - 1925     MARK NOT FOUND   CGS
 HV4370
 HV4370                          STATION DESCRIPTION
 HV4370
 HV4370'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4370'STATION IS ON THE SUMMIT OF A PROMINENT BARE HILL WHICH IS
 HV4370'LOCATED ABOUT 400 METERS SE OF THE CHAIN BRIDGE ON TH E SIDE
 HV4370'OF THE POTOMAC RIVER.  THERE IS ANOTHER HILL JUST AS PROMINENT
 HV4370'A SHORT DISTANCE NW WITH SEVERAL HOUSES UPON IT.  THE STATION
 HV4370'IS ON THE S CORNER OF THE FILL MADE IN FRONT OF A HOUSE WHICH
 HV4370'HAS BURNED DOWN.  IT IS ABOUT MIDWAY BETWEEN THE FOUNDATION
 HV4370'AND THE EDGE OF THE FILL.
 HV4370'
 HV4370'THE UNDERGROUND MARK IS A 3/4-INCH DRILL HOLE SURROUNDED BY
 HV4370'A TRIANGLE CUT IN THE TOP OF A LARGE BOULDER, IRREGULAR IN
 HV4370'SHAPE SET WITH ITS TOP ABOUT 1-1/2 BELOW THE SURFACE OF THE
 HV4370'GROUND.
 HV4370'
 HV4370'THE SURFACE MARK IS A REGULAR C. AND G.S. STATION MARK IN A
 HV4370'LARGE IRREGULAR SHAPED BOULDER SET WITH ITS TOP SLIGHTLY
 HV4370'ABOVE THE SURFACE OF THE GROUND.
 HV4370
 HV4370                          STATION RECOVERY (1925)
 HV4370
 HV4370'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1925 (GLB)
 HV4370'SEARCHED FOR THOROUGHLY AND NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8006 ***********************************************************************
 HV8006  DESIGNATION -  RV 1
 HV8006  PID         -  HV8006
 HV8006  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8006  COUNTRY     -  US
 HV8006  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8006
 HV8006                         *CURRENT SURVEY CONTROL
 HV8006  ______________________________________________________________________
 HV8006* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8006* NAVD 88 ORTHO HEIGHT -    21.023 (meters)       68.97  (feet) ADJUSTED
 HV8006  ______________________________________________________________________
 HV8006  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8006  DYNAMIC HEIGHT  -         21.012 (meters)       68.94  (feet) COMP
 HV8006  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8006
 HV8006  VERT ORDER      -  FIRST     CLASS 0
 HV8006
 HV8006.The horizontal coordinates were scaled from a map and have
 HV8006.an estimated accuracy of +/- 6 seconds.
 HV8006
 HV8006.The orthometric height was determined by differential leveling and
 HV8006.adjusted by the NATIONAL GEODETIC SURVEY
 HV8006.in June 1991.
 HV8006
 HV8006.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8006.GEOID18 height accuracy estimate available here.
 HV8006
 HV8006.Click photographs - Photos may exist for this station.
 HV8006
 HV8006.The dynamic height is computed by dividing the NAVD 88
 HV8006.geopotential number by the normal gravity value computed on the
 HV8006.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8006.degrees latitude (g = 980.6199 gals.).
 HV8006
 HV8006.The modeled gravity was interpolated from observed gravity values.
 HV8006
 HV8006
 HV8006_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8006
 HV8006                          SUPERSEDED SURVEY CONTROL
 HV8006
 HV8006  NGVD 29 (08/12/92)   21.253  (m)           69.73   (f) ADJUSTED    1 0
 HV8006
 HV8006.Superseded values are not recommended for survey control.
 HV8006
 HV8006.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8006.See file dsdata.pdf to determine how the superseded data were derived.
 HV8006
 HV8006_MARKER: R = RIVET
 HV8006_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8006_SP_SET: BUILDING
 HV8006_MARK LOGO: NONE
 HV8006_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8006_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8006
 HV8006  HISTORY     - Date     Condition        Report By
 HV8006  HISTORY     - 1949     MONUMENTED       CGS
 HV8006  HISTORY     - 1978     GOOD             NGS
 HV8006  HISTORY     - 1978     GOOD             NGS
 HV8006  HISTORY     - 1982     GOOD             NGS
 HV8006  HISTORY     - 19920615 GOOD             NGS
 HV8006
 HV8006                          STATION DESCRIPTION
 HV8006
 HV8006'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8006'IN WASHINGTON DC.
 HV8006'AT THE WHITE HOUSE, SET IN TOP OF THE SOUTHWEST CORNER OF THE SECOND
 HV8006'PILLAR NORTH OF THE WHITE HOUSE AND ON THE WEST SIDE OF THE NORTH
 HV8006'ENTRANCE.
 HV8006
 HV8006                          STATION RECOVERY (1978)
 HV8006
 HV8006'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8006'AT THE WHITE HOUSE, SET IN TOP OF THE SOUTHWEST CORNER OF THE SECOND
 HV8006'PILLAR NORTH OF THE WHITE HOUSE AND ON THE WEST SIDE OF THE NORTH
 HV8006'ENTRANCE.
 HV8006
 HV8006                          STATION RECOVERY (1982)
 HV8006
 HV8006'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8006'RECOVERED IN GOOD CONDITION.
 HV8006
 HV8006                          STATION RECOVERY (1992)
 HV8006
 HV8006'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8006'IN WASHINGTON, D.C., AT THE WHITE HOUSE, SET IN TOP OF THE SOUTHWEST
 HV8006'CORNER OF THE SECOND PILLAR NORTH OF THE WHITE HOUSE AND ON THE WEST
 HV8006'SIDE OF THE NORTH ENTRANCE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1279 ***********************************************************************
 HV1279  DESIGNATION -  RV 1 BORR
 HV1279  PID         -  HV1279
 HV1279  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1279  COUNTRY     -  US
 HV1279  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1279
 HV1279                         *CURRENT SURVEY CONTROL
 HV1279  ______________________________________________________________________
 HV1279* NAD 83(1986) POSITION- 38 54 42.     (N) 076 59 54.     (W)   SCALED
 HV1279* NAVD 88 ORTHO HEIGHT -    25.223 (meters)       82.75  (feet) ADJUSTED
 HV1279  ______________________________________________________________________
 HV1279  GEOID HEIGHT    -        -32.101 (meters)                     GEOID18
 HV1279  DYNAMIC HEIGHT  -         25.210 (meters)       82.71  (feet) COMP
 HV1279  MODELED GRAVITY -    980,106.6   (mgal)                       NAVD 88
 HV1279
 HV1279  VERT ORDER      -  FIRST     CLASS I
 HV1279
 HV1279.The horizontal coordinates were scaled from a map and have
 HV1279.an estimated accuracy of +/- 6 seconds.
 HV1279
 HV1279.The orthometric height was determined by differential leveling and
 HV1279.adjusted by the NATIONAL GEODETIC SURVEY
 HV1279.in June 1991.
 HV1279
 HV1279.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1279.GEOID18 height accuracy estimate available here.
 HV1279
 HV1279.Click photographs - Photos may exist for this station.
 HV1279
 HV1279.The dynamic height is computed by dividing the NAVD 88
 HV1279.geopotential number by the normal gravity value computed on the
 HV1279.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1279.degrees latitude (g = 980.6199 gals.).
 HV1279
 HV1279.The modeled gravity was interpolated from observed gravity values.
 HV1279
 HV1279
 HV1279_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ267088(NAD 83)
 HV1279
 HV1279                          SUPERSEDED SURVEY CONTROL
 HV1279
 HV1279  NGVD 29 (11/26/84)   25.452  (m)           83.50   (f) ADJUSTED    1 1
 HV1279
 HV1279.Superseded values are not recommended for survey control.
 HV1279
 HV1279.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1279.See file dsdata.pdf to determine how the superseded data were derived.
 HV1279
 HV1279_MARKER: R = RIVET
 HV1279_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1279_SP_SET: CON CURB OF SIDE DITCH
 HV1279_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1279
 HV1279  HISTORY     - Date     Condition        Report By
 HV1279  HISTORY     - UNK      MONUMENTED       BORR
 HV1279  HISTORY     - 1971     GOOD             NGS
 HV1279
 HV1279                          STATION DESCRIPTION
 HV1279
 HV1279'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1279'AT WASHINGTON.
 HV1279'AT WASHINGTON, D.C., ABOUT 700 FEET NORTHEAST ALONG THE BALTIMORE
 HV1279'AND OHIO RAILROAD FROM THE UNDERPASS FOR NEW YORK AVENUE, 300
 HV1279'FEET NORTH OF THE CENTER LINE OF THE AVENUE, 15 FEET NORTH OF THE
 HV1279'NORTH RAIL OF THE 4TH SET OF TRACKS NORTH OF THE AVENUE, SET IN
 HV1279'THE TOP AND 1.0 FOOT EAST OF THE WEST END OF A CONCRETE CURB FOR
 HV1279'A CONCRETE SIDE-DITCH, AND ABOUT 3 FEET BELOW THE LEVEL OF THE
 HV1279'TRACK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8013 ***********************************************************************
 HV8013  DESIGNATION -  RV 10
 HV8013  PID         -  HV8013
 HV8013  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8013  COUNTRY     -  US
 HV8013  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8013
 HV8013                         *CURRENT SURVEY CONTROL
 HV8013  ______________________________________________________________________
 HV8013* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8013* NAVD 88 ORTHO HEIGHT -    21.023 (meters)       68.97  (feet) ADJUSTED
 HV8013  ______________________________________________________________________
 HV8013  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8013  DYNAMIC HEIGHT  -         21.011 (meters)       68.93  (feet) COMP
 HV8013  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8013
 HV8013  VERT ORDER      -  FIRST     CLASS 0
 HV8013
 HV8013.The horizontal coordinates were scaled from a map and have
 HV8013.an estimated accuracy of +/- 6 seconds.
 HV8013
 HV8013.The orthometric height was determined by differential leveling and
 HV8013.adjusted by the NATIONAL GEODETIC SURVEY
 HV8013.in June 1991.
 HV8013
 HV8013.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8013.GEOID18 height accuracy estimate available here.
 HV8013
 HV8013.Click photographs - Photos may exist for this station.
 HV8013
 HV8013.The dynamic height is computed by dividing the NAVD 88
 HV8013.geopotential number by the normal gravity value computed on the
 HV8013.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8013.degrees latitude (g = 980.6199 gals.).
 HV8013
 HV8013.The modeled gravity was interpolated from observed gravity values.
 HV8013
 HV8013
 HV8013_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8013
 HV8013                          SUPERSEDED SURVEY CONTROL
 HV8013
 HV8013  NGVD 29 (08/12/92)   21.253  (m)           69.73   (f) ADJUSTED    1 0
 HV8013
 HV8013.Superseded values are not recommended for survey control.
 HV8013
 HV8013.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8013.See file dsdata.pdf to determine how the superseded data were derived.
 HV8013
 HV8013_MARKER: R = RIVET
 HV8013_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8013_SP_SET: BUILDING
 HV8013_MARK LOGO: NONE
 HV8013_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8013_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8013
 HV8013  HISTORY     - Date     Condition        Report By
 HV8013  HISTORY     - 1949     MONUMENTED       CGS
 HV8013  HISTORY     - 1978     GOOD             NGS
 HV8013  HISTORY     - 1978     GOOD             NGS
 HV8013  HISTORY     - 1982     GOOD             NGS
 HV8013  HISTORY     - 19920615 GOOD             NGS
 HV8013
 HV8013                          STATION DESCRIPTION
 HV8013
 HV8013'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8013'IN WASHINGTON DC.
 HV8013'AT THE WHITE HOUSE, SET IN TOP OF THE SOUTHEAST CORNER OF THE BASE OF
 HV8013'THE SECOND PILLAR NORTH OF THE WHITE HOUSE AND ON THE EAST SIDE OF THE
 HV8013'NORTH ENTRANCE TO THE WHITE HOUSE.
 HV8013
 HV8013                          STATION RECOVERY (1978)
 HV8013
 HV8013'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8013'AT THE WHITE HOUSE, SET IN TOP OF THE SOUTHEAST CORNER OF THE BASE OF
 HV8013'THE SECOND PILLAR NORTH OF THE WHITE HOUSE AND ON THE EAST SIDE OF THE
 HV8013'NORTH ENTRANCE TO THE WHITE HOUSE.
 HV8013
 HV8013                          STATION RECOVERY (1982)
 HV8013
 HV8013'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8013'RECOVERED IN GOOD CONDITION.
 HV8013
 HV8013                          STATION RECOVERY (1992)
 HV8013
 HV8013'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8013'IN WASHINGTON, D.C., AT THE WHITE HOUSE, SET IN TOP OF THE SOUTHEAST
 HV8013'CORNER OF THE BASE OF THE SECOND PILLAR NORTH OF THE WHITE HOUSE AND
 HV8013'ON THE EAST SIDE OF THE NORTH ENTRANCE TO THE WHITE HOUSE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8007 ***********************************************************************
 HV8007  DESIGNATION -  RV 2
 HV8007  PID         -  HV8007
 HV8007  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8007  COUNTRY     -  US
 HV8007  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8007
 HV8007                         *CURRENT SURVEY CONTROL
 HV8007  ______________________________________________________________________
 HV8007* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8007* NAVD 88 ORTHO HEIGHT -    21.025 (meters)       68.98  (feet) ADJUSTED
 HV8007  ______________________________________________________________________
 HV8007  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8007  DYNAMIC HEIGHT  -         21.014 (meters)       68.94  (feet) COMP
 HV8007  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8007
 HV8007  VERT ORDER      -  FIRST     CLASS 0
 HV8007
 HV8007.The horizontal coordinates were scaled from a map and have
 HV8007.an estimated accuracy of +/- 6 seconds.
 HV8007
 HV8007.The orthometric height was determined by differential leveling and
 HV8007.adjusted by the NATIONAL GEODETIC SURVEY
 HV8007.in June 1991.
 HV8007
 HV8007.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8007.GEOID18 height accuracy estimate available here.
 HV8007
 HV8007.Click photographs - Photos may exist for this station.
 HV8007
 HV8007.The dynamic height is computed by dividing the NAVD 88
 HV8007.geopotential number by the normal gravity value computed on the
 HV8007.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8007.degrees latitude (g = 980.6199 gals.).
 HV8007
 HV8007.The modeled gravity was interpolated from observed gravity values.
 HV8007
 HV8007
 HV8007_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8007
 HV8007                          SUPERSEDED SURVEY CONTROL
 HV8007
 HV8007  NGVD 29 (08/12/92)   21.256  (m)           69.74   (f) ADJUSTED    1 0
 HV8007
 HV8007.Superseded values are not recommended for survey control.
 HV8007
 HV8007.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8007.See file dsdata.pdf to determine how the superseded data were derived.
 HV8007
 HV8007_MARKER: R = RIVET
 HV8007_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8007_SP_SET: BUILDING
 HV8007_MARK LOGO: NONE
 HV8007_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8007_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8007
 HV8007  HISTORY     - Date     Condition        Report By
 HV8007  HISTORY     - 1949     MONUMENTED       CGS
 HV8007  HISTORY     - 1978     GOOD             NGS
 HV8007  HISTORY     - 1978     GOOD             NGS
 HV8007  HISTORY     - 1982     GOOD             NGS
 HV8007  HISTORY     - 19920615 GOOD             NGS
 HV8007
 HV8007                          STATION DESCRIPTION
 HV8007
 HV8007'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8007'IN WASHINGTON DC.
 HV8007'AT THE WHITE HOUSE, SET IN TOP OF THE NORTHEAST CORNER OF THE SECOND
 HV8007'PILLAR NORTH OF THE WHITE HOUSE AND ON THE WEST SIDE OF THE NORTH
 HV8007'ENTRANCE.
 HV8007
 HV8007                          STATION RECOVERY (1978)
 HV8007
 HV8007'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8007'AT THE WHITE HOUSE, SET IN TOP OF THE NORTHEAST CORNER OF THE SECOND
 HV8007'PILLAR NORTH OF THE WHITE HOUSE AND ON THE WEST SIDE OF THE NORTH
 HV8007'ENTRANCE.
 HV8007
 HV8007                          STATION RECOVERY (1982)
 HV8007
 HV8007'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8007'RECOVERED IN GOOD CONDITION.
 HV8007
 HV8007                          STATION RECOVERY (1992)
 HV8007
 HV8007'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8007'IN WASHINGTON, D.C., AT THE WHITE HOUSE, SET IN TOP OF THE NORTHEAST
 HV8007'CORNER OF THE SECOND PILLAR NORTH OF THE WHITE HOUSE AND ON THE WEST
 HV8007'SIDE OF THE NORTH ENTRANCE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1274 ***********************************************************************
 HV1274  DESIGNATION -  RV 2 BORR
 HV1274  PID         -  HV1274
 HV1274  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1274  COUNTRY     -  US
 HV1274  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1274
 HV1274                         *CURRENT SURVEY CONTROL
 HV1274  ______________________________________________________________________
 HV1274* NAD 83(1986) POSITION- 38 54 52.     (N) 076 59 25.     (W)   SCALED
 HV1274* NAVD 88 ORTHO HEIGHT -    31.315 (meters)      102.74  (feet) POSTED
 HV1274  ______________________________________________________________________
 HV1274  GEOID HEIGHT    -        -32.111 (meters)                     GEOID18
 HV1274  DYNAMIC HEIGHT  -         31.30  (meters)      102.7   (feet) COMP
 HV1274  MODELED GRAVITY -    980,106.3   (mgal)                       NAVD 88
 HV1274
 HV1274  VERT ORDER      -  * POSTED, SEE BELOW
 HV1274
 HV1274.The horizontal coordinates were scaled from a map and have
 HV1274.an estimated accuracy of +/- 6 seconds.
 HV1274
 HV1274.The orthometric height was determined by differential leveling
 HV1274.and adjusted by the NATIONAL GEODETIC SURVEY in 1992.
 HV1274
 HV1274.* This is a POSTED BENCH MARK height.
 HV1274
 HV1274.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1274.GEOID18 height accuracy estimate available here.
 HV1274
 HV1274.Click photographs - Photos may exist for this station.
 HV1274
 HV1274.The dynamic height is computed by dividing the NAVD 88
 HV1274.geopotential number by the normal gravity value computed on the
 HV1274.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1274.degrees latitude (g = 980.6199 gals.).
 HV1274
 HV1274.The modeled gravity was interpolated from observed gravity values.
 HV1274
 HV1274
 HV1274_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ274091(NAD 83)
 HV1274
 HV1274                          SUPERSEDED SURVEY CONTROL
 HV1274
 HV1274  NGVD 29 (11/26/84)   31.544  (m)          103.49   (f) ADJUSTED    1 2
 HV1274
 HV1274.Superseded values are not recommended for survey control.
 HV1274
 HV1274.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1274.See file dsdata.pdf to determine how the superseded data were derived.
 HV1274
 HV1274_MARKER: R = RIVET
 HV1274_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1274_SP_SET: CONC BASE
 HV1274_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1274
 HV1274  HISTORY     - Date     Condition        Report By
 HV1274  HISTORY     - UNK      MONUMENTED       BORR
 HV1274  HISTORY     - 1942     GOOD             CGS
 HV1274  HISTORY     - 1971     MARK NOT FOUND   BORR
 HV1274
 HV1274                          STATION DESCRIPTION
 HV1274
 HV1274'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1274'1.6 MI NE FROM WASHINGTON.
 HV1274'1.6 MILES NORTHEAST ALONG THE WASHINGTON-BALTIMORE BRANCH OF THE
 HV1274'BALTIMORE AND OHIO RAILROAD FROM UNION STATION AT WASHINGTON, AT
 HV1274'IVY CITY, 125 FEET SOUTHEAST OF THE F TOWER, AT A SIGNAL BRIDGE,
 HV1274'IN THE SOUTH SIDE OF THE CONCRETE BASE, 35 FEET NORTHWEST OF THE
 HV1274'CENTERLINE OF THE TRACK, AND LEVEL WITH THE TOP OF THE RAIL.  A
 HV1274'STANDARD MONEL-METAL RIVET.
 HV1274
 HV1274                          STATION RECOVERY (1971)
 HV1274
 HV1274'RECOVERY NOTE BY BALTIMORE AND OHIO RAILROAD 1971
 HV1274'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8008 ***********************************************************************
 HV8008  DESIGNATION -  RV 3
 HV8008  PID         -  HV8008
 HV8008  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8008  COUNTRY     -  US
 HV8008  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8008
 HV8008                         *CURRENT SURVEY CONTROL
 HV8008  ______________________________________________________________________
 HV8008* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8008* NAVD 88 ORTHO HEIGHT -    21.026 (meters)       68.98  (feet) ADJUSTED
 HV8008  ______________________________________________________________________
 HV8008  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8008  DYNAMIC HEIGHT  -         21.014 (meters)       68.94  (feet) COMP
 HV8008  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8008
 HV8008  VERT ORDER      -  FIRST     CLASS 0
 HV8008
 HV8008.The horizontal coordinates were scaled from a map and have
 HV8008.an estimated accuracy of +/- 6 seconds.
 HV8008
 HV8008.The orthometric height was determined by differential leveling and
 HV8008.adjusted by the NATIONAL GEODETIC SURVEY
 HV8008.in June 1991.
 HV8008
 HV8008.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8008.GEOID18 height accuracy estimate available here.
 HV8008
 HV8008.Click photographs - Photos may exist for this station.
 HV8008
 HV8008.The dynamic height is computed by dividing the NAVD 88
 HV8008.geopotential number by the normal gravity value computed on the
 HV8008.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8008.degrees latitude (g = 980.6199 gals.).
 HV8008
 HV8008.The modeled gravity was interpolated from observed gravity values.
 HV8008
 HV8008
 HV8008_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8008
 HV8008                          SUPERSEDED SURVEY CONTROL
 HV8008
 HV8008  NGVD 29 (08/12/92)   21.256  (m)           69.74   (f) ADJUSTED    1 0
 HV8008
 HV8008.Superseded values are not recommended for survey control.
 HV8008
 HV8008.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8008.See file dsdata.pdf to determine how the superseded data were derived.
 HV8008
 HV8008_MARKER: R = RIVET
 HV8008_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8008_SP_SET: BUILDING
 HV8008_MARK LOGO: NONE
 HV8008_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8008_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8008
 HV8008  HISTORY     - Date     Condition        Report By
 HV8008  HISTORY     - 1949     MONUMENTED       CGS
 HV8008  HISTORY     - 1978     GOOD             NGS
 HV8008  HISTORY     - 1978     GOOD             NGS
 HV8008  HISTORY     - 1982     GOOD             NGS
 HV8008  HISTORY     - 19920615 GOOD             NGS
 HV8008
 HV8008                          STATION DESCRIPTION
 HV8008
 HV8008'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8008'IN WASHINGTON DC.
 HV8008'AT THE WHITE HOUSE, SET IN TOP OF THE SOUTHWEST CORNER OF THE THIRD
 HV8008'PILLAR NORTH OF THE WHITE HOUSE ON THE WEST SIDE OF THE NORTH
 HV8008'ENTRANCE.
 HV8008
 HV8008                          STATION RECOVERY (1978)
 HV8008
 HV8008'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8008'AT THE WHITE HOUSE, SET IN TOP OF THE SOUTHWEST CORNER OF THE THIRD
 HV8008'PILLAR NORTH OF THE WHITE HOUSE ON THE WEST SIDE OF THE NORTH
 HV8008'ENTRANCE.
 HV8008
 HV8008                          STATION RECOVERY (1982)
 HV8008
 HV8008'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8008'RECOVERED IN GOOD CONDITION.
 HV8008
 HV8008                          STATION RECOVERY (1992)
 HV8008
 HV8008'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8008'IN WASHINGTON, D.C., AT THE WHITE HOUSE, SET IN TOP OF THE SOUTHWEST
 HV8008'CORNER OF THE THIRD PILLAR NORTH OF THE WHITE HOUSE ON THE WEST SIDE
 HV8008'OF THE NORTH ENTRANCE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1273 ***********************************************************************
 HV1273  DESIGNATION -  RV 3 BORR
 HV1273  PID         -  HV1273
 HV1273  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1273  COUNTRY     -  US
 HV1273  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1273
 HV1273                         *CURRENT SURVEY CONTROL
 HV1273  ______________________________________________________________________
 HV1273* NAD 83(1986) POSITION- 38 55 10.     (N) 076 58 35.     (W)   SCALED
 HV1273* NAVD 88 ORTHO HEIGHT -    24.675 (meters)       80.95  (feet) POSTED
 HV1273  ______________________________________________________________________
 HV1273  GEOID HEIGHT    -        -32.132 (meters)                     GEOID18
 HV1273  DYNAMIC HEIGHT  -         24.66  (meters)       80.9   (feet) COMP
 HV1273  MODELED GRAVITY -    980,105.3   (mgal)                       NAVD 88
 HV1273
 HV1273  VERT ORDER      -  * POSTED, SEE BELOW
 HV1273
 HV1273.The horizontal coordinates were scaled from a map and have
 HV1273.an estimated accuracy of +/- 6 seconds.
 HV1273
 HV1273.The orthometric height was determined by differential leveling
 HV1273.and adjusted by the NATIONAL GEODETIC SURVEY in 1992.
 HV1273
 HV1273.* This is a POSTED BENCH MARK height.
 HV1273
 HV1273.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1273.GEOID18 height accuracy estimate available here.
 HV1273
 HV1273.Click photographs - Photos may exist for this station.
 HV1273
 HV1273.The dynamic height is computed by dividing the NAVD 88
 HV1273.geopotential number by the normal gravity value computed on the
 HV1273.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1273.degrees latitude (g = 980.6199 gals.).
 HV1273
 HV1273.The modeled gravity was interpolated from observed gravity values.
 HV1273
 HV1273
 HV1273_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ286096(NAD 83)
 HV1273
 HV1273                          SUPERSEDED SURVEY CONTROL
 HV1273
 HV1273  NGVD 29 (11/26/84)   24.905  (m)           81.71   (f) ADJUSTED    1 2
 HV1273
 HV1273.Superseded values are not recommended for survey control.
 HV1273
 HV1273.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1273.See file dsdata.pdf to determine how the superseded data were derived.
 HV1273
 HV1273_MARKER: R = RIVET
 HV1273_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1273_SP_SET: CONC BASE OF SIGNAL
 HV1273_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1273
 HV1273  HISTORY     - Date     Condition        Report By
 HV1273  HISTORY     - UNK      MONUMENTED       BORR
 HV1273  HISTORY     - 1942     GOOD             CGS
 HV1273  HISTORY     - 1971     MARK NOT FOUND   BORR
 HV1273
 HV1273                          STATION DESCRIPTION
 HV1273
 HV1273'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1273'AT LANGDON.
 HV1273'AT LANGON, IN NORTHEAST WASHINGTON, ON THE BALTIMORE AND OHIO
 HV1273'RAILROAD, AT AUTOMATIC SIGNAL E 36-2, IN THE WEST CORNER OF THE
 HV1273'CONCRETE BASE, 8 FEET SOUTHEAST OF THE SOUTHEAST RAIL, AND ABOUT
 HV1273'6 INCHES BELOW THE BASE OF THE RAIL.  A STANDARD MONEL-METAL
 HV1273'RIVET.
 HV1273
 HV1273                          STATION RECOVERY (1971)
 HV1273
 HV1273'RECOVERY NOTE BY BALTIMORE AND OHIO RAILROAD 1971
 HV1273'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8009 ***********************************************************************
 HV8009  DESIGNATION -  RV 4
 HV8009  PID         -  HV8009
 HV8009  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8009  COUNTRY     -  US
 HV8009  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8009
 HV8009                         *CURRENT SURVEY CONTROL
 HV8009  ______________________________________________________________________
 HV8009* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8009* NAVD 88 ORTHO HEIGHT -    21.025 (meters)       68.98  (feet) ADJUSTED
 HV8009  ______________________________________________________________________
 HV8009  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8009  DYNAMIC HEIGHT  -         21.014 (meters)       68.94  (feet) COMP
 HV8009  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8009
 HV8009  VERT ORDER      -  FIRST     CLASS 0
 HV8009
 HV8009.The horizontal coordinates were scaled from a map and have
 HV8009.an estimated accuracy of +/- 6 seconds.
 HV8009
 HV8009.The orthometric height was determined by differential leveling and
 HV8009.adjusted by the NATIONAL GEODETIC SURVEY
 HV8009.in June 1991.
 HV8009
 HV8009.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8009.GEOID18 height accuracy estimate available here.
 HV8009
 HV8009.Click photographs - Photos may exist for this station.
 HV8009
 HV8009.The dynamic height is computed by dividing the NAVD 88
 HV8009.geopotential number by the normal gravity value computed on the
 HV8009.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8009.degrees latitude (g = 980.6199 gals.).
 HV8009
 HV8009.The modeled gravity was interpolated from observed gravity values.
 HV8009
 HV8009
 HV8009_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8009
 HV8009                          SUPERSEDED SURVEY CONTROL
 HV8009
 HV8009  NGVD 29 (08/12/92)   21.256  (m)           69.74   (f) ADJUSTED    1 0
 HV8009
 HV8009.Superseded values are not recommended for survey control.
 HV8009
 HV8009.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8009.See file dsdata.pdf to determine how the superseded data were derived.
 HV8009
 HV8009_MARKER: R = RIVET
 HV8009_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8009_SP_SET: BUILDING
 HV8009_MARK LOGO: NONE
 HV8009_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8009_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8009
 HV8009  HISTORY     - Date     Condition        Report By
 HV8009  HISTORY     - 1949     MONUMENTED       CGS
 HV8009  HISTORY     - 1978     GOOD             NGS
 HV8009  HISTORY     - 1978     GOOD             NGS
 HV8009  HISTORY     - 1982     GOOD             NGS
 HV8009  HISTORY     - 19920615 GOOD             NGS
 HV8009
 HV8009                          STATION DESCRIPTION
 HV8009
 HV8009'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8009'IN WASHINGTON DC.
 HV8009'AT THE WHITE HOUSE, SET IN TOP OF THE NORTHEAST CORNER OF THE BASE
 HV8009'OF THE THIRD PILLAR NORTH OF THE WHITE HOUSE AND ON THE WEST SIDE OF
 HV8009'THE NORTH ENTRANCE TO THE WHITE HOUSE.
 HV8009
 HV8009                          STATION RECOVERY (1978)
 HV8009
 HV8009'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8009'AT THE WHITE HOUSE, SET IN TOP OF THE NORTHEAST CORNER OF THE BASE
 HV8009'OF THE THIRD PILLAR NORTH OF THE WHITE HOUSE AND ON THE WEST SIDE OF
 HV8009'THE NORTH ENTRANCE TO THE WHITE HOUSE.
 HV8009
 HV8009                          STATION RECOVERY (1982)
 HV8009
 HV8009'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8009'RECOVERED IN GOOD CONDITION.
 HV8009
 HV8009                          STATION RECOVERY (1992)
 HV8009
 HV8009'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8009'IN WASHINGTON, D.C., AT THE WHITE HOUSE, SET IN TOP OF THE NORTHEAST
 HV8009'CORNER OF THE BASE OF THE THIRD PILLAR NORTH OF THE WHITE HOUSE AND
 HV8009'ON THE WEST SIDE OF THE NORTH ENTRANCE TO THE WHITE HOUSE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1271 ***********************************************************************
 HV1271  DESIGNATION -  RV 4 BORR
 HV1271  PID         -  HV1271
 HV1271  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1271  COUNTRY     -  US
 HV1271  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1271
 HV1271                         *CURRENT SURVEY CONTROL
 HV1271  ______________________________________________________________________
 HV1271* NAD 83(1986) POSITION- 38 55 44.     (N) 076 57 50.     (W)   SCALED
 HV1271* NAVD 88 ORTHO HEIGHT -    20.182 (meters)       66.21  (feet) POSTED
 HV1271  ______________________________________________________________________
 HV1271  GEOID HEIGHT    -        -32.143 (meters)                     GEOID18
 HV1271  DYNAMIC HEIGHT  -         20.17  (meters)       66.2   (feet) COMP
 HV1271  MODELED GRAVITY -    980,104.6   (mgal)                       NAVD 88
 HV1271
 HV1271  VERT ORDER      -  * POSTED, SEE BELOW
 HV1271
 HV1271.The horizontal coordinates were scaled from a map and have
 HV1271.an estimated accuracy of +/- 6 seconds.
 HV1271
 HV1271.The orthometric height was determined by differential leveling
 HV1271.and adjusted by the NATIONAL GEODETIC SURVEY in 1992.
 HV1271
 HV1271.* This is a POSTED BENCH MARK height.
 HV1271
 HV1271.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1271.GEOID18 height accuracy estimate available here.
 HV1271
 HV1271.Click photographs - Photos may exist for this station.
 HV1271
 HV1271.The dynamic height is computed by dividing the NAVD 88
 HV1271.geopotential number by the normal gravity value computed on the
 HV1271.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1271.degrees latitude (g = 980.6199 gals.).
 HV1271
 HV1271.The modeled gravity was interpolated from observed gravity values.
 HV1271
 HV1271
 HV1271_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ297107(NAD 83)
 HV1271
 HV1271                          SUPERSEDED SURVEY CONTROL
 HV1271
 HV1271  NGVD 29 (11/26/84)   20.412  (m)           66.97   (f) ADJUSTED    1 2
 HV1271
 HV1271.Superseded values are not recommended for survey control.
 HV1271
 HV1271.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1271.See file dsdata.pdf to determine how the superseded data were derived.
 HV1271
 HV1271_MARKER: R = RIVET
 HV1271_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1271_SP_SET: CONC BASE OF SIGNAL
 HV1271_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1271
 HV1271  HISTORY     - Date     Condition        Report By
 HV1271  HISTORY     - UNK      MONUMENTED       BORR
 HV1271  HISTORY     - 1942     GOOD             CGS
 HV1271  HISTORY     - 1971     MARK NOT FOUND   BORR
 HV1271
 HV1271                          STATION DESCRIPTION
 HV1271
 HV1271'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1271'AT LANGDON.
 HV1271'AT LANGDON, IN NORTHEAST WASHINGTON, ON THE BALTIMORE AND OHIO
 HV1271'RAILROAD, AT AUTOMATIC SIGNAL E 35-2, IN THE WEST CORNER OF THE
 HV1271'CONCRETE BASE, 10 FEET SOUTHEAST OF THE SOUTHEAST RAIL, AND LEVEL
 HV1271'WITH THE BASE OF THE RAIL.  A STANDARD MONEL-METAL RIVET.
 HV1271
 HV1271                          STATION RECOVERY (1971)
 HV1271
 HV1271'RECOVERY NOTE BY BALTIMORE AND OHIO RAILROAD 1971
 HV1271'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8042 ***********************************************************************
 HV8042  DESIGNATION -  RV 5
 HV8042  PID         -  HV8042
 HV8042  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8042  COUNTRY     -  US
 HV8042  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8042
 HV8042                         *CURRENT SURVEY CONTROL
 HV8042  ______________________________________________________________________
 HV8042* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8042* NAVD 88 ORTHO HEIGHT -    21.032 (meters)       69.00  (feet) ADJUSTED
 HV8042  ______________________________________________________________________
 HV8042  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8042  DYNAMIC HEIGHT  -         21.020 (meters)       68.96  (feet) COMP
 HV8042  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8042
 HV8042  VERT ORDER      -  FIRST     CLASS 0
 HV8042
 HV8042.The horizontal coordinates were scaled from a map and have
 HV8042.an estimated accuracy of +/- 6 seconds.
 HV8042
 HV8042.The orthometric height was determined by differential leveling and
 HV8042.adjusted by the NATIONAL GEODETIC SURVEY
 HV8042.in June 1991.
 HV8042
 HV8042.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8042.GEOID18 height accuracy estimate available here.
 HV8042
 HV8042.Click photographs - Photos may exist for this station.
 HV8042
 HV8042.The dynamic height is computed by dividing the NAVD 88
 HV8042.geopotential number by the normal gravity value computed on the
 HV8042.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8042.degrees latitude (g = 980.6199 gals.).
 HV8042
 HV8042.The modeled gravity was interpolated from observed gravity values.
 HV8042
 HV8042
 HV8042_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8042
 HV8042                          SUPERSEDED SURVEY CONTROL
 HV8042
 HV8042  NGVD 29 (08/12/92)   21.262  (m)           69.76   (f) ADJUSTED    1 0
 HV8042
 HV8042.Superseded values are not recommended for survey control.
 HV8042
 HV8042.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8042.See file dsdata.pdf to determine how the superseded data were derived.
 HV8042
 HV8042_MARKER: R = RIVET
 HV8042_SETTING: 34 = SET IN THE FOOTINGS OF SMALL/MEDIUM STRUCTURES
 HV8042_SP_SET: FOOTING FOR PILLAR
 HV8042_MARK LOGO: NONE
 HV8042_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8042_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV8042+STABILITY: SURFACE MOTION
 HV8042
 HV8042  HISTORY     - Date     Condition        Report By
 HV8042  HISTORY     - 1949     MONUMENTED       CGS
 HV8042  HISTORY     - 1982     GOOD             NGS
 HV8042  HISTORY     - 19920615 GOOD             NGS
 HV8042
 HV8042                          STATION DESCRIPTION
 HV8042
 HV8042'DESCRIBED BY NATIONAL GEODETIC SURVEY 1982
 HV8042'IN WASHINGTON DC.
 HV8042'SET IN THE TOP OF THE NORTHWEST CORNER OF THE BASE OF THE FOURTH
 HV8042'PILLAR NORTH OF THE WHITE HOUSE AND ON THE EAST SIDE OF THE NORTH
 HV8042'ENTRANCE.
 HV8042
 HV8042                          STATION RECOVERY (1992)
 HV8042
 HV8042'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8042'IN WASHINGTON, D.C., AT THE WHITE HOUSE, SET IN THE TOP OF THE
 HV8042'NORTHWEST CORNER OF THE BASE OF THE FOURTH PILLAR NORTH OF THE WHITE
 HV8042'HOUSE AND ON THE EAST SIDE OF THE NORTH ENTRANCE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1817 ***********************************************************************
 HV1817  DESIGNATION -  RV 55 BORR
 HV1817  PID         -  HV1817
 HV1817  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1817  COUNTRY     -  US
 HV1817  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1817
 HV1817                         *CURRENT SURVEY CONTROL
 HV1817  ______________________________________________________________________
 HV1817* NAD 83(1986) POSITION- 38 55 29.     (N) 077 06 26.     (W)   SCALED
 HV1817* NAVD 88 ORTHO HEIGHT -    18.365 (meters)       60.25  (feet) ADJUSTED
 HV1817  ______________________________________________________________________
 HV1817  GEOID HEIGHT    -        -31.935 (meters)                     GEOID18
 HV1817  DYNAMIC HEIGHT  -         18.355 (meters)       60.22  (feet) COMP
 HV1817  MODELED GRAVITY -    980,091.5   (mgal)                       NAVD 88
 HV1817
 HV1817  VERT ORDER      -  FIRST     CLASS II
 HV1817
 HV1817.The horizontal coordinates were scaled from a map and have
 HV1817.an estimated accuracy of +/- 6 seconds.
 HV1817
 HV1817.The orthometric height was determined by differential leveling and
 HV1817.adjusted by the NATIONAL GEODETIC SURVEY
 HV1817.in June 1991.
 HV1817
 HV1817.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1817.GEOID18 height accuracy estimate available here.
 HV1817
 HV1817.Click photographs - Photos may exist for this station.
 HV1817
 HV1817.The dynamic height is computed by dividing the NAVD 88
 HV1817.geopotential number by the normal gravity value computed on the
 HV1817.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1817.degrees latitude (g = 980.6199 gals.).
 HV1817
 HV1817.The modeled gravity was interpolated from observed gravity values.
 HV1817
 HV1817
 HV1817_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ173105(NAD 83)
 HV1817
 HV1817                          SUPERSEDED SURVEY CONTROL
 HV1817
 HV1817  NGVD 29 (11/26/84)   18.590  (m)           60.99   (f) ADJUSTED    1 2
 HV1817
 HV1817.Superseded values are not recommended for survey control.
 HV1817
 HV1817.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1817.See file dsdata.pdf to determine how the superseded data were derived.
 HV1817
 HV1817_MARKER: R = RIVET
 HV1817_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1817_SP_SET: BRIDGE
 HV1817_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1817
 HV1817  HISTORY     - Date     Condition        Report By
 HV1817  HISTORY     - UNK      MONUMENTED       BORR
 HV1817  HISTORY     - 1933     GOOD             CGS
 HV1817  HISTORY     - 1947     GOOD             CGS
 HV1817
 HV1817                          STATION DESCRIPTION
 HV1817
 HV1817'DESCRIBED BY COAST AND GEODETIC SURVEY 1933
 HV1817'2.8 MI NW FROM GEORGETOWN.
 HV1817'2.8 MILES NORTHWEST ALONG THE GEORGETOWN BRANCH OF THE BALTIMORE
 HV1817'AND OHIO RAILROAD FROM KEY BRIDGE AT GEORGETOWN, D.C., ABOUT
 HV1817'1 MILE SOUTHEAST OF THE DISTRICT OF COLUMBIA-MARYLAND LINE,
 HV1817'AT POTOMAC HEIGHTS, 150 FEET NORTHWEST OF THE INTERSECTION OF
 HV1817'CANAL ROAD AND WEAVER PLACE, AT THE BRIDGE OVER THE CHESAPEAKE
 HV1817'AND OHIO CANAL AND CANAL ROAD, IN THE TOP OF THE NORTHEAST
 HV1817'WING WALL, 8 FEET NORTHWEST OF THE EAST CORNER OF THE NORTH
 HV1817'CONCRETE ABUTMENT, 75 FEET NORTHWEST OF THE CENTERLINE OF
 HV1817'CANAL ROAD, AND 10 FEET EAST OF THE CENTERLINE OF THE TRACK.  A
 HV1817'STANDARD MONEL-METAL RIVET.
 HV1817
 HV1817                          STATION RECOVERY (1947)
 HV1817
 HV1817'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947
 HV1817'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1819 ***********************************************************************
 HV1819  DESIGNATION -  RV 56 BORR
 HV1819  PID         -  HV1819
 HV1819  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1819  COUNTRY     -  US
 HV1819  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1819
 HV1819                         *CURRENT SURVEY CONTROL
 HV1819  ______________________________________________________________________
 HV1819* NAD 83(1986) POSITION- 38 54 28.     (N) 077 05 28.     (W)   SCALED
 HV1819* NAVD 88 ORTHO HEIGHT -     9.815 (meters)       32.20  (feet) ADJUSTED
 HV1819  ______________________________________________________________________
 HV1819  GEOID HEIGHT    -        -31.979 (meters)                     GEOID18
 HV1819  DYNAMIC HEIGHT  -          9.809 (meters)       32.18  (feet) COMP
 HV1819  MODELED GRAVITY -    980,092.1   (mgal)                       NAVD 88
 HV1819
 HV1819  VERT ORDER      -  FIRST     CLASS II
 HV1819
 HV1819.The horizontal coordinates were scaled from a map and have
 HV1819.an estimated accuracy of +/- 6 seconds.
 HV1819
 HV1819.The orthometric height was determined by differential leveling and
 HV1819.adjusted by the NATIONAL GEODETIC SURVEY
 HV1819.in June 1991.
 HV1819
 HV1819.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1819.GEOID18 height accuracy estimate available here.
 HV1819
 HV1819.Click photographs - Photos may exist for this station.
 HV1819
 HV1819.The dynamic height is computed by dividing the NAVD 88
 HV1819.geopotential number by the normal gravity value computed on the
 HV1819.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1819.degrees latitude (g = 980.6199 gals.).
 HV1819
 HV1819.The modeled gravity was interpolated from observed gravity values.
 HV1819
 HV1819
 HV1819_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ186086(NAD 83)
 HV1819
 HV1819                          SUPERSEDED SURVEY CONTROL
 HV1819
 HV1819  NGVD 29 (11/26/84)   10.043  (m)           32.95   (f) ADJUSTED    1 2
 HV1819
 HV1819.Superseded values are not recommended for survey control.
 HV1819
 HV1819.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1819.See file dsdata.pdf to determine how the superseded data were derived.
 HV1819
 HV1819_MARKER: R = RIVET
 HV1819_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1819_SP_SET: RETAINING WALL
 HV1819_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1819
 HV1819  HISTORY     - Date     Condition        Report By
 HV1819  HISTORY     - UNK      MONUMENTED       BORR
 HV1819  HISTORY     - 1933     GOOD             CGS
 HV1819
 HV1819                          STATION DESCRIPTION
 HV1819
 HV1819'DESCRIBED BY COAST AND GEODETIC SURVEY 1933
 HV1819'1.3 MI NW FROM GEORGETOWN.
 HV1819'1.3 MILES NORTHWEST ALONG THE GEORGETOWN BRANCH OF THE BALTIMORE
 HV1819'AND OHIO RAILROAD FROM KEY BRIDGE AT GEORGETOWN, D.C., 0.7 MILE
 HV1819'NORTHWEST OF BRIDGE NO. 22, 290 FEET SOUTHEAST OF THE POINT OF
 HV1819'SWITCH OF A SIDING, 300 FEET SOUTHWEST OF THE HOME OF H. STROUPE
 HV1819'AT 4521 CANAL ROAD, 200 FEET NORTH OF THE NORTH BANK OF POTOMAC
 HV1819'RIVER, 50 FEET NORTH OF THE CENTERLINE OF THE TRACK, IN THE STONE
 HV1819'MASONRY RETAINING WALL ALONG THE CHESAPEAKE AND OHIO CANAL, AND
 HV1819'ABOUT 6 FEET ABOVE THE TOP OF THE RAIL.  A STANDARD MONEL-METAL
 HV1819'RIVET.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1820 ***********************************************************************
 HV1820  DESIGNATION -  RV 57 BORR
 HV1820  PID         -  HV1820
 HV1820  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1820  COUNTRY     -  US
 HV1820  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1820
 HV1820                         *CURRENT SURVEY CONTROL
 HV1820  ______________________________________________________________________
 HV1820* NAD 83(1986) POSITION- 38 54 20.     (N) 077 04 41.     (W)   SCALED
 HV1820* NAVD 88 ORTHO HEIGHT -     5.049 (meters)       16.56  (feet) ADJUSTED
 HV1820  ______________________________________________________________________
 HV1820  GEOID HEIGHT    -        -32.001 (meters)                     GEOID18
 HV1820  DYNAMIC HEIGHT  -          5.046 (meters)       16.56  (feet) COMP
 HV1820  MODELED GRAVITY -    980,091.6   (mgal)                       NAVD 88
 HV1820
 HV1820  VERT ORDER      -  FIRST     CLASS II
 HV1820
 HV1820.The horizontal coordinates were scaled from a map and have
 HV1820.an estimated accuracy of +/- 6 seconds.
 HV1820
 HV1820.The orthometric height was determined by differential leveling and
 HV1820.adjusted by the NATIONAL GEODETIC SURVEY
 HV1820.in June 1991.
 HV1820
 HV1820.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1820.GEOID18 height accuracy estimate available here.
 HV1820
 HV1820.Click photographs - Photos may exist for this station.
 HV1820
 HV1820.The dynamic height is computed by dividing the NAVD 88
 HV1820.geopotential number by the normal gravity value computed on the
 HV1820.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1820.degrees latitude (g = 980.6199 gals.).
 HV1820
 HV1820.The modeled gravity was interpolated from observed gravity values.
 HV1820
 HV1820
 HV1820_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ198083(NAD 83)
 HV1820
 HV1820                          SUPERSEDED SURVEY CONTROL
 HV1820
 HV1820  NGVD 29 (11/26/84)    5.278  (m)           17.32   (f) ADJUSTED    1 2
 HV1820
 HV1820.Superseded values are not recommended for survey control.
 HV1820
 HV1820.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1820.See file dsdata.pdf to determine how the superseded data were derived.
 HV1820
 HV1820_MARKER: R = RIVET
 HV1820_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1820_SP_SET: CULVERT
 HV1820_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1820
 HV1820  HISTORY     - Date     Condition        Report By
 HV1820  HISTORY     - UNK      MONUMENTED       BORR
 HV1820  HISTORY     - 1933     GOOD             CGS
 HV1820  HISTORY     - 1941     POOR             CGS
 HV1820
 HV1820                          STATION DESCRIPTION
 HV1820
 HV1820'DESCRIBED BY COAST AND GEODETIC SURVEY 1933
 HV1820'0.6 MI W FROM GEORGETOWN.
 HV1820'0.6 MILE WEST ALONG THE GEORGETOWN BRANCH OF THE BALTIMORE AND
 HV1820'OHIO RAILROAD FROM KEY BRIDGE AT GEORGETOWN, D.C., 150 FEET
 HV1820'WEST OF BRIDGE NO. 24, 100 FEET EAST OF BRIDGE NO. 22, 125 FEET
 HV1820'NORTH OF THE NORTH BANK OF POTOMAC RIVER, 125 FEET SOUTH OF THE
 HV1820'CHESAPEAKE AND OHIO CANAL, AT A CONCRETE CULVERT, IN THE SOUTHEAST
 HV1820'END OF THE SOUTH HEADWALL, 10 FEET SOUTH OF THE CENTERLINE OF THE
 HV1820'TRACK, AND ABOUT 1 FOOT BELOW THE TOP OF THE RAIL.  A STANDARD
 HV1820'MONEL-METAL RIVET.
 HV1820
 HV1820                          STATION RECOVERY (1941)
 HV1820
 HV1820'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1941
 HV1820'MARK RECOVERED IN POOR CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1821 ***********************************************************************
 HV1821  DESIGNATION -  RV 58 BORR
 HV1821  PID         -  HV1821
 HV1821  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1821  COUNTRY     -  US
 HV1821  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1821
 HV1821                         *CURRENT SURVEY CONTROL
 HV1821  ______________________________________________________________________
 HV1821* NAD 83(1986) POSITION- 38 54 16.     (N) 077 04 12.     (W)   SCALED
 HV1821* NAVD 88 ORTHO HEIGHT -     3.403 (meters)       11.16  (feet) ADJUSTED
 HV1821  ______________________________________________________________________
 HV1821  GEOID HEIGHT    -        -32.016 (meters)                     GEOID18
 HV1821  DYNAMIC HEIGHT  -          3.401 (meters)       11.16  (feet) COMP
 HV1821  MODELED GRAVITY -    980,092.1   (mgal)                       NAVD 88
 HV1821
 HV1821  VERT ORDER      -  FIRST     CLASS II
 HV1821
 HV1821.The horizontal coordinates were scaled from a map and have
 HV1821.an estimated accuracy of +/- 6 seconds.
 HV1821
 HV1821.The orthometric height was determined by differential leveling and
 HV1821.adjusted by the NATIONAL GEODETIC SURVEY
 HV1821.in June 1991.
 HV1821
 HV1821.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1821.GEOID18 height accuracy estimate available here.
 HV1821
 HV1821.Click photographs - Photos may exist for this station.
 HV1821
 HV1821.The dynamic height is computed by dividing the NAVD 88
 HV1821.geopotential number by the normal gravity value computed on the
 HV1821.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1821.degrees latitude (g = 980.6199 gals.).
 HV1821
 HV1821.The modeled gravity was interpolated from observed gravity values.
 HV1821
 HV1821
 HV1821_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ205082(NAD 83)
 HV1821
 HV1821                          SUPERSEDED SURVEY CONTROL
 HV1821
 HV1821  NGVD 29 (11/26/84)    3.629  (m)           11.91   (f) ADJUSTED    1 2
 HV1821
 HV1821.Superseded values are not recommended for survey control.
 HV1821
 HV1821.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1821.See file dsdata.pdf to determine how the superseded data were derived.
 HV1821
 HV1821_MARKER: R = RIVET
 HV1821_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1821_SP_SET: WATER COLUMN FOUNDATION
 HV1821_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1821
 HV1821  HISTORY     - Date     Condition        Report By
 HV1821  HISTORY     - UNK      MONUMENTED       BORR
 HV1821  HISTORY     - 1933     GOOD             CGS
 HV1821  HISTORY     - 1941     GOOD             CGS
 HV1821
 HV1821                          STATION DESCRIPTION
 HV1821
 HV1821'DESCRIBED BY COAST AND GEODETIC SURVEY 1933
 HV1821'AT GEORGETOWN.
 HV1821'AT GEORGETOWN, D.C., ON THE BALTIMORE AND OHIO RAILROAD, 400 FEET
 HV1821'WEST OF KEY BRIDGE, 100 FEET SOUTH OF THE CHESAPEAKE AND OHIO
 HV1821'CANAL, 15 FEET WEST OF THE ARCH OF THE OLD AQUEDUCT BRIDGE, AT
 HV1821'A WATER COLUMN, IN THE CENTER OF THE EAST SIDE OF THE CONCRETE
 HV1821'FOUNDATION, 9 FEET NORTH OF THE CENTERLINE OF THE TRACK, AND
 HV1821'ABOUT 1 FOOT BELOW THE TOP OF THE RAIL.  A STANDARD MONEL-METAL
 HV1821'RIVET.
 HV1821
 HV1821                          STATION RECOVERY (1941)
 HV1821
 HV1821'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1941
 HV1821'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8043 ***********************************************************************
 HV8043  DESIGNATION -  RV 6
 HV8043  PID         -  HV8043
 HV8043  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8043  COUNTRY     -  US
 HV8043  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8043
 HV8043                         *CURRENT SURVEY CONTROL
 HV8043  ______________________________________________________________________
 HV8043* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8043* NAVD 88 ORTHO HEIGHT -    21.034 (meters)       69.01  (feet) ADJUSTED
 HV8043  ______________________________________________________________________
 HV8043  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8043  DYNAMIC HEIGHT  -         21.023 (meters)       68.97  (feet) COMP
 HV8043  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8043
 HV8043  VERT ORDER      -  FIRST     CLASS 0
 HV8043
 HV8043.The horizontal coordinates were scaled from a map and have
 HV8043.an estimated accuracy of +/- 6 seconds.
 HV8043
 HV8043.The orthometric height was determined by differential leveling and
 HV8043.adjusted by the NATIONAL GEODETIC SURVEY
 HV8043.in June 1991.
 HV8043
 HV8043.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8043.GEOID18 height accuracy estimate available here.
 HV8043
 HV8043.Click photographs - Photos may exist for this station.
 HV8043
 HV8043.The dynamic height is computed by dividing the NAVD 88
 HV8043.geopotential number by the normal gravity value computed on the
 HV8043.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8043.degrees latitude (g = 980.6199 gals.).
 HV8043
 HV8043.The modeled gravity was interpolated from observed gravity values.
 HV8043
 HV8043
 HV8043_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8043
 HV8043                          SUPERSEDED SURVEY CONTROL
 HV8043
 HV8043  NGVD 29 (08/12/92)   21.265  (m)           69.77   (f) ADJUSTED    1 0
 HV8043
 HV8043.Superseded values are not recommended for survey control.
 HV8043
 HV8043.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8043.See file dsdata.pdf to determine how the superseded data were derived.
 HV8043
 HV8043_MARKER: R = RIVET
 HV8043_SETTING: 34 = SET IN THE FOOTINGS OF SMALL/MEDIUM STRUCTURES
 HV8043_SP_SET: FOOTING FOR PILLAR
 HV8043_MARK LOGO: NONE
 HV8043_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8043_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV8043+STABILITY: SURFACE MOTION
 HV8043
 HV8043  HISTORY     - Date     Condition        Report By
 HV8043  HISTORY     - 1949     MONUMENTED       CGS
 HV8043  HISTORY     - 1982     GOOD             NGS
 HV8043  HISTORY     - 19920615 GOOD             NGS
 HV8043
 HV8043                          STATION DESCRIPTION
 HV8043
 HV8043'DESCRIBED BY NATIONAL GEODETIC SURVEY 1982
 HV8043'IN WASHINGTON DC.
 HV8043'SET IN THE SOUTHEAST CORNER OF THE BASE OF THE FOURTH PILLAR NORTH
 HV8043'OF THE WHITE HOUSE AND ON THE EAST SIDE OF THE NORTH ENTRANCE.
 HV8043
 HV8043                          STATION RECOVERY (1992)
 HV8043
 HV8043'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8043'IN WASHINGTON, D.C., AT THE WHITE HOUSE, SET IN THE SOUTHEAST CORNER
 HV8043'OF THE BASE OF THE FOURTH PILLAR NORTH OF THE WHITE HOUSE AND ON THE
 HV8043'EAST SIDE OF THE NORTH ENTRANCE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1375 ***********************************************************************
 HV1375  DESIGNATION -  RV 6 BORR
 HV1375  PID         -  HV1375
 HV1375  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1375  COUNTRY     -  US
 HV1375  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1375
 HV1375                         *CURRENT SURVEY CONTROL
 HV1375  ______________________________________________________________________
 HV1375* NAD 83(1986) POSITION- 38 55 56.     (N) 076 59 40.     (W)   SCALED
 HV1375* NAVD 88 ORTHO HEIGHT -    46.661 (meters)      153.09  (feet) ADJUSTED
 HV1375  ______________________________________________________________________
 HV1375  GEOID HEIGHT    -        -32.069 (meters)                     GEOID18
 HV1375  DYNAMIC HEIGHT  -         46.637 (meters)      153.01  (feet) COMP
 HV1375  MODELED GRAVITY -    980,108.8   (mgal)                       NAVD 88
 HV1375
 HV1375  VERT ORDER      -  FIRST     CLASS I
 HV1375
 HV1375.The horizontal coordinates were scaled from a map and have
 HV1375.an estimated accuracy of +/- 6 seconds.
 HV1375
 HV1375.The orthometric height was determined by differential leveling and
 HV1375.adjusted by the NATIONAL GEODETIC SURVEY
 HV1375.in June 1991.
 HV1375
 HV1375.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1375.GEOID18 height accuracy estimate available here.
 HV1375
 HV1375.Click photographs - Photos may exist for this station.
 HV1375
 HV1375.The dynamic height is computed by dividing the NAVD 88
 HV1375.geopotential number by the normal gravity value computed on the
 HV1375.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1375.degrees latitude (g = 980.6199 gals.).
 HV1375
 HV1375.The modeled gravity was interpolated from observed gravity values.
 HV1375
 HV1375
 HV1375_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ271111(NAD 83)
 HV1375
 HV1375                          SUPERSEDED SURVEY CONTROL
 HV1375
 HV1375  NGVD 29 (11/26/84)   46.886  (m)          153.83   (f) ADJUSTED    1 1
 HV1375
 HV1375.Superseded values are not recommended for survey control.
 HV1375
 HV1375.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1375.See file dsdata.pdf to determine how the superseded data were derived.
 HV1375
 HV1375_MARKER: R = RIVET
 HV1375_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1375_SP_SET: SIGNAL FOUNDATION
 HV1375_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1375
 HV1375  HISTORY     - Date     Condition        Report By
 HV1375  HISTORY     - UNK      MONUMENTED       BORR
 HV1375  HISTORY     - 1971     GOOD             NGS
 HV1375
 HV1375                          STATION DESCRIPTION
 HV1375
 HV1375'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1375'AT WASHINGTON.
 HV1375'AT WASHINGTON, D.C., AT THE SUBDIVISION OF BROOKLAND, ABOUT
 HV1375'0.4 MILE SOUTHWEST ALONG U.S. HIGHWAY 1 FROM THE POST OFFICE
 HV1375'AT LANGDON, THENCE 0.7 MILE WEST ALONG GIRARD STREET, THENCE
 HV1375'0.35 MILE NORTH ALONG THE BALTIMORE AND OHIO RAILROAD, SET IN
 HV1375'THE TOP OF THE NORTHWEST CORNER OF THE CONCRETE FOUNDATION FOR
 HV1375'A SIGNAL (SIGNAL HAS BEEN REMOVED), 33 FEET SOUTH OF THE RAILROAD
 HV1375'UNDERPASS FOR MONROE STREET, 9 FEET EAST OF THE CENTER LINE OF
 HV1375'THE EAST TRACK, AND ABOUT 1 FOOT ABOVE THE LEVEL OF THE TRACK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8010 ***********************************************************************
 HV8010  DESIGNATION -  RV 7
 HV8010  PID         -  HV8010
 HV8010  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8010  COUNTRY     -  US
 HV8010  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8010
 HV8010                         *CURRENT SURVEY CONTROL
 HV8010  ______________________________________________________________________
 HV8010* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8010* NAVD 88 ORTHO HEIGHT -    21.027 (meters)       68.99  (feet) ADJUSTED
 HV8010  ______________________________________________________________________
 HV8010  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8010  DYNAMIC HEIGHT  -         21.016 (meters)       68.95  (feet) COMP
 HV8010  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8010
 HV8010  VERT ORDER      -  FIRST     CLASS 0
 HV8010
 HV8010.The horizontal coordinates were scaled from a map and have
 HV8010.an estimated accuracy of +/- 6 seconds.
 HV8010
 HV8010.The orthometric height was determined by differential leveling and
 HV8010.adjusted by the NATIONAL GEODETIC SURVEY
 HV8010.in June 1991.
 HV8010
 HV8010.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8010.GEOID18 height accuracy estimate available here.
 HV8010
 HV8010.Click photographs - Photos may exist for this station.
 HV8010
 HV8010.The dynamic height is computed by dividing the NAVD 88
 HV8010.geopotential number by the normal gravity value computed on the
 HV8010.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8010.degrees latitude (g = 980.6199 gals.).
 HV8010
 HV8010.The modeled gravity was interpolated from observed gravity values.
 HV8010
 HV8010
 HV8010_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8010
 HV8010                          SUPERSEDED SURVEY CONTROL
 HV8010
 HV8010  NGVD 29 (08/12/92)   21.258  (m)           69.74   (f) ADJUSTED    1 0
 HV8010
 HV8010.Superseded values are not recommended for survey control.
 HV8010
 HV8010.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8010.See file dsdata.pdf to determine how the superseded data were derived.
 HV8010
 HV8010_MARKER: R = RIVET
 HV8010_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8010_SP_SET: BUILDING
 HV8010_MARK LOGO: NONE
 HV8010_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8010_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8010
 HV8010  HISTORY     - Date     Condition        Report By
 HV8010  HISTORY     - 1949     MONUMENTED       CGS
 HV8010  HISTORY     - 1978     GOOD             NGS
 HV8010  HISTORY     - 1978     GOOD             NGS
 HV8010  HISTORY     - 1982     GOOD             NGS
 HV8010  HISTORY     - 19920615 GOOD             NGS
 HV8010
 HV8010                          STATION DESCRIPTION
 HV8010
 HV8010'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8010'IN WASHINGTON DC.
 HV8010'AT THE WHITE HOUSE, SET IN TOP OF THE NORTHWEST CORNER OF THE BASE OF
 HV8010'THE THIRD PILLAR NORTH OF THE WHITE HOUSE AND ON THE EAST SIDE OF THE
 HV8010'NORTH ENTRANCE.
 HV8010
 HV8010                          STATION RECOVERY (1978)
 HV8010
 HV8010'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8010'AT THE WHITE HOUSE, SET IN TOP OF THE NORTHWEST CORNER OF THE BASE OF
 HV8010'THE THIRD PILLAR NORTH OF THE WHITE HOUSE AND ON THE EAST SIDE OF THE
 HV8010'NORTH ENTRANCE.
 HV8010
 HV8010                          STATION RECOVERY (1982)
 HV8010
 HV8010'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8010'RECOVERED IN GOOD CONDITION.
 HV8010
 HV8010                          STATION RECOVERY (1992)
 HV8010
 HV8010'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8010'IN WASHINGTON, D.C., AT THE WHITE HOUSE, SET IN TOP OF THE NORTHWEST
 HV8010'CORNER OF THE BASE OF THE THIRD PILLAR NORTH OF THE WHITE HOUSE AND
 HV8010'ON THE EAST SIDE OF THE NORTH ENTRANCE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1779 ***********************************************************************
 HV1779  DESIGNATION -  RV 7 BORR
 HV1779  PID         -  HV1779
 HV1779  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1779  COUNTRY     -  US
 HV1779  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1779
 HV1779                         *CURRENT SURVEY CONTROL
 HV1779  ______________________________________________________________________
 HV1779* NAD 83(1986) POSITION- 38 57 04.     (N) 077 00 05.     (W)   SCALED
 HV1779* NAVD 88 ORTHO HEIGHT -    56.794 (meters)      186.33  (feet) ADJUSTED
 HV1779  ______________________________________________________________________
 HV1779  GEOID HEIGHT    -        -32.036 (meters)                     GEOID18
 HV1779  DYNAMIC HEIGHT  -         56.764 (meters)      186.23  (feet) COMP
 HV1779  MODELED GRAVITY -    980,107.4   (mgal)                       NAVD 88
 HV1779
 HV1779  VERT ORDER      -  FIRST     CLASS II
 HV1779
 HV1779.The horizontal coordinates were scaled from a map and have
 HV1779.an estimated accuracy of +/- 6 seconds.
 HV1779
 HV1779.The orthometric height was determined by differential leveling and
 HV1779.adjusted by the NATIONAL GEODETIC SURVEY
 HV1779.in June 1991.
 HV1779
 HV1779.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1779.GEOID18 height accuracy estimate available here.
 HV1779
 HV1779.Click photographs - Photos may exist for this station.
 HV1779
 HV1779.The dynamic height is computed by dividing the NAVD 88
 HV1779.geopotential number by the normal gravity value computed on the
 HV1779.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1779.degrees latitude (g = 980.6199 gals.).
 HV1779
 HV1779.The modeled gravity was interpolated from observed gravity values.
 HV1779
 HV1779
 HV1779_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ265132(NAD 83)
 HV1779
 HV1779                          SUPERSEDED SURVEY CONTROL
 HV1779
 HV1779  NGVD 29 (11/26/84)   57.017  (m)          187.06   (f) ADJUSTED    1 2
 HV1779
 HV1779.Superseded values are not recommended for survey control.
 HV1779
 HV1779.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1779.See file dsdata.pdf to determine how the superseded data were derived.
 HV1779
 HV1779_MARKER: R = RIVET
 HV1779_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1779_SP_SET: PLATFORM WALL
 HV1779_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1779
 HV1779  HISTORY     - Date     Condition        Report By
 HV1779  HISTORY     - UNK      MONUMENTED       BORR
 HV1779  HISTORY     - 1933     GOOD             CGS
 HV1779  HISTORY     - 20090317 MARK NOT FOUND   GEOCAC
 HV1779
 HV1779                          STATION DESCRIPTION
 HV1779
 HV1779'DESCRIBED BY COAST AND GEODETIC SURVEY 1933
 HV1779'AT TERRA COTTA.
 HV1779'AT TERRA COTTA, D.C, ON THE METROPOLITAN BRANCH OF THE BALTIMORE
 HV1779'AND OHIO RAILROAD, 66 FEET NORTH OF THE STATION, 135 FEET SOUTH
 HV1779'OF OVERHEAD BRIDGE NO. 5 A, IN THE TOP OF THE NORTH END OF THE
 HV1779'CONCRETE RETAINING WALL AT THE STATION PLATFORM, 10 FEET EAST OF
 HV1779'THE CENTERLINE OF THE NORTHBOUND TRACK, AND ABOUT 6 INCHES ABOVE
 HV1779'THE TOP OF THE RAIL.  A STANDARD MONEL-METAL RIVET.
 HV1779
 HV1779                          STATION RECOVERY (2009)
 HV1779
 HV1779'RECOVERY NOTE BY GEOCACHING 2009 (LPC)
 HV1779'WE SEARCHED CAREFULLY BUT WERE UNABLE TO FIND THIS MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8011 ***********************************************************************
 HV8011  DESIGNATION -  RV 8
 HV8011  PID         -  HV8011
 HV8011  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8011  COUNTRY     -  US
 HV8011  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8011
 HV8011                         *CURRENT SURVEY CONTROL
 HV8011  ______________________________________________________________________
 HV8011* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8011* NAVD 88 ORTHO HEIGHT -    21.025 (meters)       68.98  (feet) ADJUSTED
 HV8011  ______________________________________________________________________
 HV8011  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8011  DYNAMIC HEIGHT  -         21.014 (meters)       68.94  (feet) COMP
 HV8011  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8011
 HV8011  VERT ORDER      -  FIRST     CLASS 0
 HV8011
 HV8011.The horizontal coordinates were scaled from a map and have
 HV8011.an estimated accuracy of +/- 6 seconds.
 HV8011
 HV8011.The orthometric height was determined by differential leveling and
 HV8011.adjusted by the NATIONAL GEODETIC SURVEY
 HV8011.in June 1991.
 HV8011
 HV8011.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8011.GEOID18 height accuracy estimate available here.
 HV8011
 HV8011.Click photographs - Photos may exist for this station.
 HV8011
 HV8011.The dynamic height is computed by dividing the NAVD 88
 HV8011.geopotential number by the normal gravity value computed on the
 HV8011.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8011.degrees latitude (g = 980.6199 gals.).
 HV8011
 HV8011.The modeled gravity was interpolated from observed gravity values.
 HV8011
 HV8011
 HV8011_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8011
 HV8011                          SUPERSEDED SURVEY CONTROL
 HV8011
 HV8011  NGVD 29 (08/12/92)   21.256  (m)           69.74   (f) ADJUSTED    1 0
 HV8011
 HV8011.Superseded values are not recommended for survey control.
 HV8011
 HV8011.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8011.See file dsdata.pdf to determine how the superseded data were derived.
 HV8011
 HV8011_MARKER: R = RIVET
 HV8011_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8011_SP_SET: BUILDING
 HV8011_MARK LOGO: NONE
 HV8011_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8011_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8011
 HV8011  HISTORY     - Date     Condition        Report By
 HV8011  HISTORY     - 1949     MONUMENTED       CGS
 HV8011  HISTORY     - 1978     GOOD             NGS
 HV8011  HISTORY     - 1978     GOOD             NGS
 HV8011  HISTORY     - 1982     GOOD             NGS
 HV8011  HISTORY     - 19920615 GOOD             NGS
 HV8011
 HV8011                          STATION DESCRIPTION
 HV8011
 HV8011'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8011'IN WASHINGTON DC.
 HV8011'AT THE WHITE HOUSE, SET IN TOP OF THE SOUTHEAST CORNER OF THE BASE OF
 HV8011'THE THIRD PILLAR NORTH OF THE WHITE HOUSE AND ON THE EAST SIDE OF THE
 HV8011'NORTH ENTRANCE.
 HV8011
 HV8011                          STATION RECOVERY (1978)
 HV8011
 HV8011'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8011'AT THE WHITE HOUSE, SET IN TOP OF THE SOUTHEAST CORNER OF THE BASE OF
 HV8011'THE THIRD PILLAR NORTH OF THE WHITE HOUSE AND ON THE EAST SIDE OF THE
 HV8011'NORTH ENTRANCE.
 HV8011
 HV8011                          STATION RECOVERY (1982)
 HV8011
 HV8011'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8011'RECOVERED IN GOOD CONDITION.
 HV8011
 HV8011                          STATION RECOVERY (1992)
 HV8011
 HV8011'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8011'IN WASHINGTON, D.C., AT THE WHITE HOUSE, SET IN TOP OF THE SOUTHEAST
 HV8011'CORNER OF THE BASE OF THE THIRD PILLAR NORTH OF THE WHITE HOUSE AND
 HV8011'ON THE EAST SIDE OF THE NORTH ENTRANCE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8012 ***********************************************************************
 HV8012  DESIGNATION -  RV 9
 HV8012  PID         -  HV8012
 HV8012  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8012  COUNTRY     -  US
 HV8012  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8012
 HV8012                         *CURRENT SURVEY CONTROL
 HV8012  ______________________________________________________________________
 HV8012* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8012* NAVD 88 ORTHO HEIGHT -    21.019 (meters)       68.96  (feet) ADJUSTED
 HV8012  ______________________________________________________________________
 HV8012  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8012  DYNAMIC HEIGHT  -         21.008 (meters)       68.92  (feet) COMP
 HV8012  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8012
 HV8012  VERT ORDER      -  FIRST     CLASS 0
 HV8012
 HV8012.The horizontal coordinates were scaled from a map and have
 HV8012.an estimated accuracy of +/- 6 seconds.
 HV8012
 HV8012.The orthometric height was determined by differential leveling and
 HV8012.adjusted by the NATIONAL GEODETIC SURVEY
 HV8012.in June 1991.
 HV8012
 HV8012.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8012.GEOID18 height accuracy estimate available here.
 HV8012
 HV8012.Click photographs - Photos may exist for this station.
 HV8012
 HV8012.The dynamic height is computed by dividing the NAVD 88
 HV8012.geopotential number by the normal gravity value computed on the
 HV8012.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8012.degrees latitude (g = 980.6199 gals.).
 HV8012
 HV8012.The modeled gravity was interpolated from observed gravity values.
 HV8012
 HV8012
 HV8012_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8012
 HV8012                          SUPERSEDED SURVEY CONTROL
 HV8012
 HV8012  NGVD 29 (08/12/92)   21.250  (m)           69.72   (f) ADJUSTED    1 0
 HV8012
 HV8012.Superseded values are not recommended for survey control.
 HV8012
 HV8012.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8012.See file dsdata.pdf to determine how the superseded data were derived.
 HV8012
 HV8012_MARKER: R = RIVET
 HV8012_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8012_SP_SET: BUILDING
 HV8012_MARK LOGO: NONE
 HV8012_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8012_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8012
 HV8012  HISTORY     - Date     Condition        Report By
 HV8012  HISTORY     - 1949     MONUMENTED       CGS
 HV8012  HISTORY     - 1978     GOOD             NGS
 HV8012  HISTORY     - 1978     GOOD             NGS
 HV8012  HISTORY     - 1982     GOOD             NGS
 HV8012  HISTORY     - 19920615 GOOD             NGS
 HV8012
 HV8012                          STATION DESCRIPTION
 HV8012
 HV8012'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8012'IN WASHINGTON DC.
 HV8012'AT THE WHITE HOUSE, SET IN TOP OF THE NORTHEAST CORNER OF THE BASE OF
 HV8012'THE SECOND PILLAR NORTH OF THE WHITE HOUSE AND ON THE EAST SIDE OF
 HV8012'THE NORTH ENTRANCE OF THE WHITE HOUSE.
 HV8012
 HV8012                          STATION RECOVERY (1978)
 HV8012
 HV8012'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8012'AT THE WHITE HOUSE, SET IN TOP OF THE NORTHEAST CORNER OF THE BASE OF
 HV8012'THE SECOND PILLAR NORTH OF THE WHITE HOUSE AND ON THE EAST SIDE OF
 HV8012'THE NORTH ENTRANCE OF THE WHITE HOUSE.
 HV8012
 HV8012                          STATION RECOVERY (1982)
 HV8012
 HV8012'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8012'RECOVERED IN GOOD CONDITION.
 HV8012
 HV8012                          STATION RECOVERY (1992)
 HV8012
 HV8012'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8012'IN WASHINGTON, D.C., AT THE WHITE HOUSE, SET IN TOP OF THE NORTHWEST
 HV8012'CORNER OF THE BASE OF THE SECOND PILLAR NORTH OF THE WHITE HOUSE AND
 HV8012'ON THE EAST SIDE OF THE NORTH ENTRANCE OF THE WHITE HOUSE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2010 ***********************************************************************
 HV2010  DESIGNATION -  RV OUTLET
 HV2010  PID         -  HV2010
 HV2010  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2010  COUNTRY     -  US
 HV2010  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2010
 HV2010                         *CURRENT SURVEY CONTROL
 HV2010  ______________________________________________________________________
 HV2010* NAD 83(1986) POSITION- 38 52 58.     (N) 077 01 58.     (W)   SCALED
 HV2010* NAVD 88 ORTHO HEIGHT -     4.007 (meters)       13.15  (feet) ADJUSTED
 HV2010  ______________________________________________________________________
 HV2010  GEOID HEIGHT    -        -32.105 (meters)                     GEOID18
 HV2010  DYNAMIC HEIGHT  -          4.005 (meters)       13.14  (feet) COMP
 HV2010  MODELED GRAVITY -    980,097.6   (mgal)                       NAVD 88
 HV2010
 HV2010  VERT ORDER      -  FIRST     CLASS II
 HV2010
 HV2010.The horizontal coordinates were scaled from a map and have
 HV2010.an estimated accuracy of +/- 6 seconds.
 HV2010
 HV2010.The orthometric height was determined by differential leveling and
 HV2010.adjusted by the NATIONAL GEODETIC SURVEY
 HV2010.in June 1991.
 HV2010
 HV2010.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2010.GEOID18 height accuracy estimate available here.
 HV2010
 HV2010.Click photographs - Photos may exist for this station.
 HV2010
 HV2010.The dynamic height is computed by dividing the NAVD 88
 HV2010.geopotential number by the normal gravity value computed on the
 HV2010.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2010.degrees latitude (g = 980.6199 gals.).
 HV2010
 HV2010.The modeled gravity was interpolated from observed gravity values.
 HV2010
 HV2010
 HV2010_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ236057(NAD 83)
 HV2010
 HV2010                          SUPERSEDED SURVEY CONTROL
 HV2010
 HV2010  NGVD 29 (11/26/84)    4.241  (m)           13.91   (f) ADJUSTED    1 2
 HV2010
 HV2010.Superseded values are not recommended for survey control.
 HV2010
 HV2010.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2010.See file dsdata.pdf to determine how the superseded data were derived.
 HV2010
 HV2010_MARKER: R = RIVET
 HV2010_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV2010_SP_SET: BRIDGE
 HV2010_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV2010
 HV2010  HISTORY     - Date     Condition        Report By
 HV2010  HISTORY     - UNK      MONUMENTED       CGS
 HV2010  HISTORY     - 1956     GOOD             CGS
 HV2010
 HV2010                          STATION DESCRIPTION
 HV2010
 HV2010'DESCRIBED BY COAST AND GEODETIC SURVEY 1956
 HV2010'AT WASHINGTON.
 HV2010'AT WASHINGTON, D.C., AT THE NW CORNER OF THE NW BRIDGE (NEAREST
 HV2010'THE BASIN) OVER THE OUTLET OF THE TIDAL BASIN, 0.4 FT E OF THE
 HV2010'RAILING WALL, DIRECTLY OVER THE N ABUTMENT, 1.5 FT S OF THE N
 HV2010'EDGE OF THE CONCRETE SIDEWALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1983 ***********************************************************************
 HV1983  TIDAL BM    -  This is a Tidal Bench Mark.
 HV1983  DESIGNATION -  RV PIER 4
 HV1983  PID         -  HV1983
 HV1983  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1983  COUNTRY     -  US
 HV1983  USGS QUAD   -  ALEXANDRIA (2019)
 HV1983
 HV1983                         *CURRENT SURVEY CONTROL
 HV1983  ______________________________________________________________________
 HV1983* NAD 83(1986) POSITION- 38 52 27.00   (N) 077 01 17.87   (W)   HD_HELD1
 HV1983* NAVD 88 ORTHO HEIGHT -     2.335 (meters)        7.66  (feet) ADJUSTED
 HV1983  ______________________________________________________________________
 HV1983  GEOID HEIGHT    -        -32.138 (meters)                     GEOID18
 HV1983  DYNAMIC HEIGHT  -          2.333 (meters)        7.65  (feet) COMP
 HV1983  MODELED GRAVITY -    980,097.2   (mgal)                       NAVD 88
 HV1983
 HV1983  VERT ORDER      -  FIRST     CLASS II
 HV1983
 HV1983.The horizontal coordinates were determined by differentially corrected
 HV1983.hand held GPS observations or other comparable positioning techniques
 HV1983.and have an estimated accuracy of +/- 3 meters.
 HV1983
 HV1983.The orthometric height was determined by differential leveling and
 HV1983.adjusted by the NATIONAL GEODETIC SURVEY
 HV1983.in April 2010.
 HV1983
 HV1983.No vertical observational check was made to the station.
 HV1983
 HV1983.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1983.GEOID18 height accuracy estimate available here.
 HV1983
 HV1983.This Tidal Bench Mark is designated as VM 467
 HV1983.by the CENTER FOR OPERATIONAL OCEANOGRAPHIC PRODUCTS AND SERVICES.
 HV1983
 HV1983.Click photographs - Photos may exist for this station.
 HV1983
 HV1983.The dynamic height is computed by dividing the NAVD 88
 HV1983.geopotential number by the normal gravity value computed on the
 HV1983.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1983.degrees latitude (g = 980.6199 gals.).
 HV1983
 HV1983.The modeled gravity was interpolated from observed gravity values.
 HV1983
 HV1983
 HV1983_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2462604755(NAD 83)
 HV1983
 HV1983                          SUPERSEDED SURVEY CONTROL
 HV1983
 HV1983  NAVD 88 (06/15/91)    2.325  (m)            7.63   (f) SUPERSEDED  1 1
 HV1983  NGVD 29 (08/12/92)    2.561  (m)            8.40   (f) ADJUSTED    1 1
 HV1983  NGVD 29 (??/??/87)    2.563  (m)            8.41   (f) SUPERSEDED  1 1
 HV1983
 HV1983.Superseded values are not recommended for survey control.
 HV1983
 HV1983.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1983.See file dsdata.pdf to determine how the superseded data were derived.
 HV1983
 HV1983_MARKER: R = RIVET
 HV1983_SETTING: 38 = SET IN THE ABUTMENT OR PIER OF A LARGE BRIDGE
 HV1983_SP_SET: PIER
 HV1983_MARK LOGO: NONE
 HV1983_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1983_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1983_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1983+SATELLITE: SATELLITE OBSERVATIONS - November 24, 2008
 HV1983
 HV1983  HISTORY     - Date     Condition        Report By
 HV1983  HISTORY     - UNK      MONUMENTED       CGS
 HV1983  HISTORY     - 1972     GOOD             NGS
 HV1983  HISTORY     - 19920512 GOOD             NGS
 HV1983  HISTORY     - 20081124 GOOD             NGS
 HV1983
 HV1983                          STATION DESCRIPTION
 HV1983
 HV1983'DESCRIBED BY NATIONAL GEODETIC SURVEY 1972
 HV1983'AT WASHINGTON DC.
 HV1983'AT WASHINGTON, D.C., ALONG WATER STREET AT PIER 4 OF THE WILSON
 HV1983'BOAT LINE, ALONG THE SOUTHEAST SIDE AND AT THE SOUTHWEST END OF
 HV1983'PIER 4, 7 FEET NORTHWEST OF THE SOUTHEAST EDGE OF THE PIER AND AT
 HV1983'A POINT WHERE THERE IS A CURVE IN THE PIER, 9 FEET SOUTHWEST OF
 HV1983'THE CENTER OF THE SOUTHWEST BOAT ANCHOR ON THE SOUTHEAST SIDE
 HV1983'OF THE PIER, AND IS A MONEL METAL RIVET SET IN THE PIER AND LEVEL
 HV1983'WITH THE PIER FLOOR.
 HV1983
 HV1983                          STATION RECOVERY (1992)
 HV1983
 HV1983'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1983'IN WASHINGTON, D.C., AT 6TH AND WATER STREET, A MONEL RIVET NEAR THE
 HV1983'SOUTHWEST CORNER OF THE SPIRIT OF WASHINGTON CRUISES LOADING DOCK
 HV1983'(PIER 4), 2.4 M (7.9 FT) EAST OF A BUMPER POST WITH A LIGHT, 0.6 M
 HV1983'(2.0 FT) NORTH OF THE MOST EASTERLY OF 9 BUMPER POST AT THE SOUTHWEST
 HV1983'END OF THE PIER, 0.2 M (0.7 FT) NORTHWEST OF THE SOUTHEAST EDGE OF
 HV1983'THE PIER, AND LEVEL WITH THE PIER.
 HV1983
 HV1983                          STATION RECOVERY (2008)
 HV1983
 HV1983'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV1983'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1839 ***********************************************************************
 HV1839  DESIGNATION -  RV VENT
 HV1839  PID         -  HV1839
 HV1839  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1839  COUNTRY     -  US
 HV1839  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1839
 HV1839                         *CURRENT SURVEY CONTROL
 HV1839  ______________________________________________________________________
 HV1839* NAD 83(1986) POSITION- 38 53 31.     (N) 077 02 01.     (W)   SCALED
 HV1839* NAVD 88 ORTHO HEIGHT -     2.479 (meters)        8.13  (feet) ADJUSTED
 HV1839  ______________________________________________________________________
 HV1839  GEOID HEIGHT    -        -32.085 (meters)                     GEOID18
 HV1839  DYNAMIC HEIGHT  -          2.478 (meters)        8.13  (feet) COMP
 HV1839  MODELED GRAVITY -    980,098.2   (mgal)                       NAVD 88
 HV1839
 HV1839  VERT ORDER      -  FIRST     CLASS II
 HV1839
 HV1839.The horizontal coordinates were scaled from a map and have
 HV1839.an estimated accuracy of +/- 6 seconds.
 HV1839
 HV1839.The orthometric height was determined by differential leveling and
 HV1839.adjusted by the NATIONAL GEODETIC SURVEY
 HV1839.in June 1991.
 HV1839
 HV1839.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1839.GEOID18 height accuracy estimate available here.
 HV1839
 HV1839.Click photographs - Photos may exist for this station.
 HV1839
 HV1839.The dynamic height is computed by dividing the NAVD 88
 HV1839.geopotential number by the normal gravity value computed on the
 HV1839.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1839.degrees latitude (g = 980.6199 gals.).
 HV1839
 HV1839.The modeled gravity was interpolated from observed gravity values.
 HV1839
 HV1839
 HV1839_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ236067(NAD 83)
 HV1839
 HV1839                          SUPERSEDED SURVEY CONTROL
 HV1839
 HV1839  NGVD 29 (11/26/84)    2.714  (m)            8.90   (f) ADJUSTED    1 2
 HV1839
 HV1839.Superseded values are not recommended for survey control.
 HV1839
 HV1839.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1839.See file dsdata.pdf to determine how the superseded data were derived.
 HV1839
 HV1839_MARKER: R = RIVET
 HV1839_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1839_SP_SET: COAMING GRILL
 HV1839_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1839
 HV1839  HISTORY     - Date     Condition        Report By
 HV1839  HISTORY     - UNK      MONUMENTED       CGS
 HV1839  HISTORY     - 1956     GOOD             CGS
 HV1839
 HV1839                          STATION DESCRIPTION
 HV1839
 HV1839'DESCRIBED BY COAST AND GEODETIC SURVEY 1956
 HV1839'AT WASHINGTON.
 HV1839'AT WASHINGTON, D.C., NEAR THE SE QUADRANT OF THE INTERSECTION
 HV1839'OF CONSTITUTION AVENUE AND 15TH STREET NW, 71 FT S OF THE GATE
 HV1839'POST AT THE CORNER, 8.3 FT E OF THE E CURB ALONG 15TH STREET,
 HV1839'IN THE SE CORNER OF THE COAMING AROUND A 4-FT SQUARE GRILL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1222 ***********************************************************************
 HV1222  DESIGNATION -  S
 HV1222  PID         -  HV1222
 HV1222  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1222  COUNTRY     -  US
 HV1222  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1222
 HV1222                         *CURRENT SURVEY CONTROL
 HV1222  ______________________________________________________________________
 HV1222* NAD 83(1986) POSITION- 38 53 34.4    (N) 076 59 59.8    (W)   HD_HELD2
 HV1222* NAVD 88 ORTHO HEIGHT -    27.019 (meters)       88.64  (feet) ADJUSTED
 HV1222  ______________________________________________________________________
 HV1222  GEOID HEIGHT    -        -32.138 (meters)                     GEOID18
 HV1222  DYNAMIC HEIGHT  -         27.005 (meters)       88.60  (feet) COMP
 HV1222  MODELED GRAVITY -    980,101.9   (mgal)                       NAVD 88
 HV1222
 HV1222  VERT ORDER      -  FIRST     CLASS II
 HV1222
 HV1222.The horizontal coordinates were established by autonomous hand held GPS
 HV1222.observations and have an estimated accuracy of +/- 10 meters.
 HV1222
 HV1222.The orthometric height was determined by differential leveling and
 HV1222.adjusted by the NATIONAL GEODETIC SURVEY
 HV1222.in June 1991.
 HV1222
 HV1222.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1222.GEOID18 height accuracy estimate available here.
 HV1222
 HV1222.Click photographs - Photos may exist for this station.
 HV1222
 HV1222.The dynamic height is computed by dividing the NAVD 88
 HV1222.geopotential number by the normal gravity value computed on the
 HV1222.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1222.degrees latitude (g = 980.6199 gals.).
 HV1222
 HV1222.The modeled gravity was interpolated from observed gravity values.
 HV1222
 HV1222
 HV1222_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2655206791(NAD 83)
 HV1222
 HV1222                          SUPERSEDED SURVEY CONTROL
 HV1222
 HV1222  NGVD 29 (??/??/92)   27.25   (m)           89.4    (f) COMPUTED    1 2
 HV1222
 HV1222.Superseded values are not recommended for survey control.
 HV1222
 HV1222.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1222.See file dsdata.pdf to determine how the superseded data were derived.
 HV1222
 HV1222_MARKER: DB = BENCH MARK DISK
 HV1222_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1222_SP_SET: SCHOOL BUILDING
 HV1222_STAMPING: S 1917
 HV1222_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1222_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1222+SATELLITE: SATELLITE OBSERVATIONS - July 13, 2003
 HV1222
 HV1222  HISTORY     - Date     Condition        Report By
 HV1222  HISTORY     - 1917     MONUMENTED       CGS
 HV1222  HISTORY     - 1929     GOOD             CGS
 HV1222  HISTORY     - 1960     GOOD             CGS
 HV1222  HISTORY     - 20030713 GOOD             GEOCAC
 HV1222
 HV1222                          STATION DESCRIPTION
 HV1222
 HV1222'DESCRIBED BY COAST AND GEODETIC SURVEY 1929
 HV1222'AT WASHINGTON.
 HV1222'AT WASHINGTON, AT THE INTERSECTION OF FIFTH AND C STREETS
 HV1222'NORTHEAST, OPPOSITE STANTON PARK, AT THE NORTH ENTRANCE TO THE
 HV1222'PEABODY SCHOOL, AT THE WEST SIDE OF THE STEPS, IN THE TOP OF THE
 HV1222'STONE SLAB COPING OF THE SIDE WALL, AND ABOUT 4 INCHES NORTH OF
 HV1222'THE BUILDING WALL.  A STANDARD DISK, STAMPED S 1917.
 HV1222
 HV1222                          STATION RECOVERY (1960)
 HV1222
 HV1222'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960
 HV1222'RECOVERED IN GOOD CONDITION.
 HV1222
 HV1222                          STATION RECOVERY (2003)
 HV1222
 HV1222'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV1222'FORMER PEABODY SCHOOL IS NOW PEABODY EARLY CHILDHOOD CAMPUS, 425 C
 HV1222'STREET, NE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1973 ***********************************************************************
 HV1973  DESIGNATION -  S 1
 HV1973  PID         -  HV1973
 HV1973  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1973  COUNTRY     -  US
 HV1973  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1973
 HV1973                         *CURRENT SURVEY CONTROL
 HV1973  ______________________________________________________________________
 HV1973* NAD 83(1986) POSITION- 38 53 40.9    (N) 077 00 17.3    (W)   HD_HELD2
 HV1973* NAVD 88 ORTHO HEIGHT -    18.455 (meters)       60.55  (feet) ADJUSTED
 HV1973  ______________________________________________________________________
 HV1973  GEOID HEIGHT    -        -32.125 (meters)                     GEOID18
 HV1973  DYNAMIC HEIGHT  -         18.445 (meters)       60.52  (feet) COMP
 HV1973  MODELED GRAVITY -    980,102.4   (mgal)                       NAVD 88
 HV1973
 HV1973  VERT ORDER      -  FIRST     CLASS II
 HV1973
 HV1973.The horizontal coordinates were established by autonomous hand held GPS
 HV1973.observations and have an estimated accuracy of +/- 10 meters.
 HV1973
 HV1973.The orthometric height was determined by differential leveling and
 HV1973.adjusted by the NATIONAL GEODETIC SURVEY
 HV1973.in August 2020.
 HV1973
 HV1973.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1973.GEOID18 height accuracy estimate available here.
 HV1973
 HV1973.Click photographs - Photos may exist for this station.
 HV1973
 HV1973.The dynamic height is computed by dividing the NAVD 88
 HV1973.geopotential number by the normal gravity value computed on the
 HV1973.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1973.degrees latitude (g = 980.6199 gals.).
 HV1973
 HV1973.The modeled gravity was interpolated from observed gravity values.
 HV1973
 HV1973
 HV1973_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2613507001(NAD 83)
 HV1973
 HV1973                          SUPERSEDED SURVEY CONTROL
 HV1973
 HV1973  NAVD 88 (06/15/91)   18.451  (m)           60.53   (f) SUPERSEDED  1 1
 HV1973  NGVD 29 (11/26/84)   18.686  (m)           61.31   (f) ADJUSTED    1 1
 HV1973
 HV1973.Superseded values are not recommended for survey control.
 HV1973
 HV1973.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1973.See file dsdata.pdf to determine how the superseded data were derived.
 HV1973
 HV1973_MARKER: DB = BENCH MARK DISK
 HV1973_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1973_SP_SET: BUILDING
 HV1973_STAMPING: S 1 1929
 HV1973_MARK LOGO: CGS
 HV1973_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1973_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1973+SATELLITE: SATELLITE OBSERVATIONS - March 16, 2020
 HV1973
 HV1973  HISTORY     - Date     Condition        Report By
 HV1973  HISTORY     - 1929     MONUMENTED       CGS
 HV1973  HISTORY     - 1971     GOOD             NGS
 HV1973  HISTORY     - 1979     GOOD             NGS
 HV1973  HISTORY     - 20091006 GOOD             GEOCAC
 HV1973  HISTORY     - 20111023 GOOD             GEOCAC
 HV1973  HISTORY     - 20120301 GOOD             NGS
 HV1973  HISTORY     - 20180716 GOOD             USPSQD
 HV1973  HISTORY     - 20200316 GOOD             MDSHA
 HV1973
 HV1973                          STATION DESCRIPTION
 HV1973
 HV1973'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1973'AT WASHINGTON.
 HV1973'AT WASHINGTON, D.C., AT THE U.S. IMMIGRATION AND NATURALIZATION
 HV1973'SERVICE BUILDING, (119 D STREET), SET VERTICALLY 15 INCHES EAST
 HV1973'OF THE NORTHWEST CORNER AND IN THE SECOND COURSE OF STONE OF THE
 HV1973'BUILDING, AND ABOUT 3 FEET ABOVE THE SIDEWALK.
 HV1973
 HV1973                          STATION RECOVERY (1979)
 HV1973
 HV1973'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1973'RECOVERED IN GOOD CONDITION.
 HV1973
 HV1973                          STATION RECOVERY (2009)
 HV1973
 HV1973'RECOVERY NOTE BY GEOCACHING 2009 (RCF)
 HV1973'THE BUILDING IS LOCATED ON D ST NE, AND NOW HOUSES THE US CAPITOL
 HV1973'POLICE.
 HV1973
 HV1973                          STATION RECOVERY (2011)
 HV1973
 HV1973'RECOVERY NOTE BY GEOCACHING 2011 (BSB)
 HV1973'THE IS HOUSED ON THE NW CORNER OF THE US CAPITOL POLICE HEADQUARTERS.
 HV1973'
 HV1973'THE S1 TAG IS HARD TO READ BUT THE REST IS READABLE. THE MARKER COULD
 HV1973'
 HV1973'USE SOME TLC, AS IT IS WEATHERED.
 HV1973
 HV1973                          STATION RECOVERY (2012)
 HV1973
 HV1973'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1973'RECOVERED AS DESCRIBED.
 HV1973
 HV1973                          STATION RECOVERY (2018)
 HV1973
 HV1973'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV1973'RECOVERED IN GOOD CONDITION.
 HV1973
 HV1973                          STATION RECOVERY (2020)
 HV1973
 HV1973'RECOVERY NOTE BY MARYLAND DOT HIGHWAY ADMINISTRATION 2020 (JML)
 HV1973'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8026 ***********************************************************************
 HV8026  DESIGNATION -  S 1
 HV8026  PID         -  HV8026
 HV8026  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8026  COUNTRY     -  US
 HV8026  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8026
 HV8026                         *CURRENT SURVEY CONTROL
 HV8026  ______________________________________________________________________
 HV8026* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8026* NAVD 88 ORTHO HEIGHT -    16.933 (meters)       55.55  (feet) ADJUSTED
 HV8026  ______________________________________________________________________
 HV8026  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8026  DYNAMIC HEIGHT  -         16.924 (meters)       55.52  (feet) COMP
 HV8026  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8026
 HV8026  VERT ORDER      -  FIRST     CLASS 0
 HV8026
 HV8026.The horizontal coordinates were scaled from a map and have
 HV8026.an estimated accuracy of +/- 6 seconds.
 HV8026
 HV8026.The orthometric height was determined by differential leveling and
 HV8026.adjusted by the NATIONAL GEODETIC SURVEY
 HV8026.in June 1991.
 HV8026
 HV8026.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8026.GEOID18 height accuracy estimate available here.
 HV8026
 HV8026.Click photographs - Photos may exist for this station.
 HV8026
 HV8026.The dynamic height is computed by dividing the NAVD 88
 HV8026.geopotential number by the normal gravity value computed on the
 HV8026.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8026.degrees latitude (g = 980.6199 gals.).
 HV8026
 HV8026.The modeled gravity was interpolated from observed gravity values.
 HV8026
 HV8026
 HV8026_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8026
 HV8026                          SUPERSEDED SURVEY CONTROL
 HV8026
 HV8026  NGVD 29 (08/12/92)   17.166  (m)           56.32   (f) ADJUSTED    1 0
 HV8026
 HV8026.Superseded values are not recommended for survey control.
 HV8026
 HV8026.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8026.See file dsdata.pdf to determine how the superseded data were derived.
 HV8026
 HV8026_MARKER: Z = SEE DESCRIPTION
 HV8026_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8026_SP_SET: BUILDING
 HV8026_MARK LOGO: NONE
 HV8026_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8026_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8026
 HV8026  HISTORY     - Date     Condition        Report By
 HV8026  HISTORY     - 1949     MONUMENTED       CGS
 HV8026  HISTORY     - 1978     GOOD             NGS
 HV8026  HISTORY     - 1978     GOOD             NGS
 HV8026  HISTORY     - 1982     GOOD             NGS
 HV8026  HISTORY     - 19920615 GOOD             NGS
 HV8026
 HV8026                          STATION DESCRIPTION
 HV8026
 HV8026'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8026'IN WASHINGTON DC.
 HV8026'AT THE WHITE HOUSE, 3.8 FEET EAST FROM SE CORNER IN THE NW SECTION OF
 HV8026'THE EAST GARDEN, 3 FEET ABOVE THE GROUND IN THE SOUTH WALL.
 HV8026'WHITE HOUSE WALL MARK.
 HV8026
 HV8026                          STATION RECOVERY (1978)
 HV8026
 HV8026'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8026'AT THE WHITE HOUSE, 3.8 FEET EAST FROM SE CORNER IN THE NW SECTION OF
 HV8026'THE EAST GARDEN, 3 FEET ABOVE THE GROUND IN THE SOUTH WALL.
 HV8026'WHITE HOUSE WALL MARK.
 HV8026
 HV8026                          STATION RECOVERY (1982)
 HV8026
 HV8026'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8026'RECOVERED IN GOOD CONDITION.
 HV8026
 HV8026                          STATION RECOVERY (1992)
 HV8026
 HV8026'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8026'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 3.8 FEET (1.2 M) WEST FROM
 HV8026'SOUTHEAST CORNER IN THE NORTHWEST SECTION OF THE EAST GARDEN, 3 FEET
 HV8026'(0.9 M) ABOVE THE GROUND IN THE SOUTH WALL.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7998 ***********************************************************************
 HV7998  DESIGNATION -  S 10
 HV7998  PID         -  HV7998
 HV7998  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7998  COUNTRY     -  US
 HV7998  USGS QUAD   -  WASHINGTON WEST (2016)
 HV7998
 HV7998                         *CURRENT SURVEY CONTROL
 HV7998  ______________________________________________________________________
 HV7998* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV7998* NAVD 88 ORTHO HEIGHT -    20.805 (meters)       68.26  (feet) ADJUSTED
 HV7998  ______________________________________________________________________
 HV7998  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV7998  DYNAMIC HEIGHT  -         20.794 (meters)       68.22  (feet) COMP
 HV7998  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV7998
 HV7998  VERT ORDER      -  FIRST     CLASS 0
 HV7998
 HV7998.The horizontal coordinates were scaled from a map and have
 HV7998.an estimated accuracy of +/- 6 seconds.
 HV7998
 HV7998.The orthometric height was determined by differential leveling and
 HV7998.adjusted by the NATIONAL GEODETIC SURVEY
 HV7998.in June 1991.
 HV7998
 HV7998.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7998.GEOID18 height accuracy estimate available here.
 HV7998
 HV7998.Click photographs - Photos may exist for this station.
 HV7998
 HV7998.The dynamic height is computed by dividing the NAVD 88
 HV7998.geopotential number by the normal gravity value computed on the
 HV7998.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV7998.degrees latitude (g = 980.6199 gals.).
 HV7998
 HV7998.The modeled gravity was interpolated from observed gravity values.
 HV7998
 HV7998
 HV7998_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV7998
 HV7998                          SUPERSEDED SURVEY CONTROL
 HV7998
 HV7998  NGVD 29 (08/12/92)   21.037  (m)           69.02   (f) ADJUSTED    1 0
 HV7998
 HV7998.Superseded values are not recommended for survey control.
 HV7998
 HV7998.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7998.See file dsdata.pdf to determine how the superseded data were derived.
 HV7998
 HV7998_MARKER: Z = SEE DESCRIPTION
 HV7998_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV7998_SP_SET: BUILDING
 HV7998_MARK LOGO: NONE
 HV7998_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV7998_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV7998
 HV7998  HISTORY     - Date     Condition        Report By
 HV7998  HISTORY     - 1949     MONUMENTED       CGS
 HV7998  HISTORY     - 1978     GOOD             NGS
 HV7998  HISTORY     - 1978     GOOD             NGS
 HV7998  HISTORY     - 1982     GOOD             NGS
 HV7998  HISTORY     - 19920615 GOOD             NGS
 HV7998
 HV7998                          STATION DESCRIPTION
 HV7998
 HV7998'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV7998'IN WASHINGTON DC.
 HV7998'AT THE WHITE HOUSE, SET IN THE OUTSIDE WEST WALL OF THE STATE DINING
 HV7998'ROOM, 26 FEET SOUTH OF THE WEST ENTRANCE FROM THE ROOF OF THE WEST
 HV7998'WING.  WHITE HOUSE WALL MARK.
 HV7998
 HV7998                          STATION RECOVERY (1978)
 HV7998
 HV7998'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV7998'AT THE WHITE HOUSE, SET IN THE OUTSIDE WEST WALL OF THE STATE DINING
 HV7998'ROOM, 26 FEET SOUTH OF THE WEST ENTRANCE FROM THE ROOF OF THE WEST
 HV7998'WING.  WHITE HOUSE WALL MARK.
 HV7998
 HV7998                          STATION RECOVERY (1982)
 HV7998
 HV7998'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV7998'RECOVERED IN GOOD CONDITION.  NEW DESCRIPTION FOLLOWS.  AT THE WHITE
 HV7998'HOUSE, SET OUTSIDE OF THE WEST WALL OF THE STATE DINING ROOM, 7.92
 HV7998'METERS (26 FT) SOUTH OF THE WEST ENTRANCE TO THE ROOF OF WEST WING.
 HV7998'MARK IS THE TOP OF THE KNOB AT THE END OF A 1 INCH DIAMETER BRASS
 HV7998'PIN THAT PROTRUDES ABOUT 6 INCHES FROM THE WALL 1 FOOT ABOVE ROOF.
 HV7998
 HV7998                          STATION RECOVERY (1992)
 HV7998
 HV7998'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV7998'IN WASHINGTON, D.C., AT THE WHITE HOUSE, SET IN THE OUTSIDE WEST WALL
 HV7998'OF THE STATE DINING ROOM, 7.92 METERS (25.98 FT) SOUTH OF THE WEST
 HV7998'ENTRANCE FROM THE ROOF OF WEST WING, AND THE MARK IS THE TOP OF THE
 HV7998'KNOB AT THE END OF A 1-INCH DIAMETER BRASS PIN THAT PROTRUDES ABOUT
 HV7998'6 INCHES FROM THE WALL 1 FOOT (0.3 M) ABOVE ROOF.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7999 ***********************************************************************
 HV7999  DESIGNATION -  S 11
 HV7999  PID         -  HV7999
 HV7999  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7999  COUNTRY     -  US
 HV7999  USGS QUAD   -  WASHINGTON WEST (2016)
 HV7999
 HV7999                         *CURRENT SURVEY CONTROL
 HV7999  ______________________________________________________________________
 HV7999* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV7999* NAVD 88 ORTHO HEIGHT -    20.807 (meters)       68.26  (feet) ADJUSTED
 HV7999  ______________________________________________________________________
 HV7999  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV7999  DYNAMIC HEIGHT  -         20.796 (meters)       68.23  (feet) COMP
 HV7999  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV7999
 HV7999  VERT ORDER      -  FIRST     CLASS 0
 HV7999
 HV7999.The horizontal coordinates were scaled from a map and have
 HV7999.an estimated accuracy of +/- 6 seconds.
 HV7999
 HV7999.The orthometric height was determined by differential leveling and
 HV7999.adjusted by the NATIONAL GEODETIC SURVEY
 HV7999.in June 1991.
 HV7999
 HV7999.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7999.GEOID18 height accuracy estimate available here.
 HV7999
 HV7999.Click photographs - Photos may exist for this station.
 HV7999
 HV7999.The dynamic height is computed by dividing the NAVD 88
 HV7999.geopotential number by the normal gravity value computed on the
 HV7999.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV7999.degrees latitude (g = 980.6199 gals.).
 HV7999
 HV7999.The modeled gravity was interpolated from observed gravity values.
 HV7999
 HV7999
 HV7999_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV7999
 HV7999                          SUPERSEDED SURVEY CONTROL
 HV7999
 HV7999  NGVD 29 (08/12/92)   21.038  (m)           69.02   (f) ADJUSTED    1 0
 HV7999
 HV7999.Superseded values are not recommended for survey control.
 HV7999
 HV7999.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7999.See file dsdata.pdf to determine how the superseded data were derived.
 HV7999
 HV7999_MARKER: Z = SEE DESCRIPTION
 HV7999_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV7999_SP_SET: BUILDING
 HV7999_MARK LOGO: NONE
 HV7999_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV7999_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV7999
 HV7999  HISTORY     - Date     Condition        Report By
 HV7999  HISTORY     - 1949     MONUMENTED       CGS
 HV7999  HISTORY     - 1978     GOOD             NGS
 HV7999  HISTORY     - 1978     GOOD             NGS
 HV7999  HISTORY     - 1982     GOOD             NGS
 HV7999  HISTORY     - 19920615 GOOD             NGS
 HV7999
 HV7999                          STATION DESCRIPTION
 HV7999
 HV7999'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV7999'IN WASHINGTON DC.
 HV7999'AT THE WHITE HOUSE, SET IN THE OUTSIDE WEST WALL OF THE STATE DINING
 HV7999'ROOM, 11 FEET SOUTH OF THE WEST ENTRANCE FROM THE ROOF OF THE WEST
 HV7999'WING.  WHITE HOUSE WALL MARK.
 HV7999
 HV7999                          STATION RECOVERY (1978)
 HV7999
 HV7999'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV7999'AT THE WHITE HOUSE, SET IN THE OUTSIDE WEST WALL OF THE STATE DINING
 HV7999'ROOM, 11 FEET SOUTH OF THE WEST ENTRANCE FROM THE ROOF OF THE WEST
 HV7999'WING.  WHITE HOUSE WALL MARK.
 HV7999
 HV7999                          STATION RECOVERY (1982)
 HV7999
 HV7999'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV7999'RECOVERED IN GOOD CONDITION.  NEW DESCRIPTION FOLLOWS.  AT THE WHITE
 HV7999'HOUSE, SET IN THE OUTSIDE OF THE WEST WALL OF THE STATE DINING ROOM,
 HV7999'3.35 METERS (11 FT) SOUTH OF THE WEST ENTRANCE TO THE ROOF OF THE
 HV7999'WEST WING.  MARK IS THE TOP OF THE KNOB AT THE END OF A 1 INCH
 HV7999'DIAMETER BRASS PIN THAT PROTRUDES ABOUT 6 INCHES FROM THE WALL 1 FT
 HV7999'ABOVE ROOF.
 HV7999
 HV7999                          STATION RECOVERY (1992)
 HV7999
 HV7999'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV7999'IN WASHINGTON, D.C., AT THE WHITE HOUSE, SET IN THE OUTSIDE OF THE
 HV7999'WEST WALL OF THE STATE DINING ROOM, 3.35 METERS (10.99 FT) SOUTH OF
 HV7999'THE WEST ENTRANCE TO THE ROOF OF THE WEST WING, AND THE MARK IS THE
 HV7999'TOP OF THE KNOB AT THE END OF A 1-INCH DIAMETER BRASS PIN THAT
 HV7999'PROTRUDES ABOUT 6 INCHES FROM THE WALL 1 FOOT (0.3 M) ABOVE THE ROOF.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8001 ***********************************************************************
 HV8001  DESIGNATION -  S 13
 HV8001  PID         -  HV8001
 HV8001  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8001  COUNTRY     -  US
 HV8001  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8001
 HV8001                         *CURRENT SURVEY CONTROL
 HV8001  ______________________________________________________________________
 HV8001* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8001* NAVD 88 ORTHO HEIGHT -    17.105 (meters)       56.12  (feet) ADJUSTED
 HV8001  ______________________________________________________________________
 HV8001  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8001  DYNAMIC HEIGHT  -         17.096 (meters)       56.09  (feet) COMP
 HV8001  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8001
 HV8001  VERT ORDER      -  FIRST     CLASS 0
 HV8001
 HV8001.The horizontal coordinates were scaled from a map and have
 HV8001.an estimated accuracy of +/- 6 seconds.
 HV8001
 HV8001.The orthometric height was determined by differential leveling and
 HV8001.adjusted by the NATIONAL GEODETIC SURVEY
 HV8001.in June 1991.
 HV8001
 HV8001.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8001.GEOID18 height accuracy estimate available here.
 HV8001
 HV8001.Click photographs - Photos may exist for this station.
 HV8001
 HV8001.The dynamic height is computed by dividing the NAVD 88
 HV8001.geopotential number by the normal gravity value computed on the
 HV8001.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8001.degrees latitude (g = 980.6199 gals.).
 HV8001
 HV8001.The modeled gravity was interpolated from observed gravity values.
 HV8001
 HV8001
 HV8001_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8001
 HV8001                          SUPERSEDED SURVEY CONTROL
 HV8001
 HV8001  NGVD 29 (08/12/92)   17.336  (m)           56.88   (f) ADJUSTED    1 0
 HV8001
 HV8001.Superseded values are not recommended for survey control.
 HV8001
 HV8001.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8001.See file dsdata.pdf to determine how the superseded data were derived.
 HV8001
 HV8001_MARKER: Z = SEE DESCRIPTION
 HV8001_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8001_SP_SET: BUILDING
 HV8001_MARK LOGO: NONE
 HV8001_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8001_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8001
 HV8001  HISTORY     - Date     Condition        Report By
 HV8001  HISTORY     - 1949     MONUMENTED       CGS
 HV8001  HISTORY     - 1978     GOOD             NGS
 HV8001  HISTORY     - 1978     GOOD             NGS
 HV8001  HISTORY     - 1982     GOOD             NGS
 HV8001  HISTORY     - 19920615 GOOD             NGS
 HV8001
 HV8001                          STATION DESCRIPTION
 HV8001
 HV8001'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8001'IN WASHINGTON DC.
 HV8001'AT THE WHITE HOUSE, 3.9 FEET SOUTH OF THE NORTHWEST CORNER OF THE
 HV8001'WHITE HOUSE AND IN LINE WITH A SERVICE DRIVEWAY FOR DELIVERIES TO
 HV8001'KITCHEN AND OTHER ROOMS.  WHITE HOUSE WALL MARK.
 HV8001
 HV8001                          STATION RECOVERY (1978)
 HV8001
 HV8001'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8001'AT THE WHITE HOUSE, 3.9 FEET SOUTH OF THE NORTHWEST CORNER OF THE
 HV8001'WHITE HOUSE AND IN LINE WITH A SERVICE DRIVEWAY FOR DELIVERIES TO
 HV8001'KITCHEN AND OTHER ROOMS.  WHITE HOUSE WALL MARK.
 HV8001
 HV8001                          STATION RECOVERY (1982)
 HV8001
 HV8001'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8001'RECOVERED IN GOOD CONDITION.
 HV8001
 HV8001                          STATION RECOVERY (1992)
 HV8001
 HV8001'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8001'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 3.9 FEET (1.2 M) SOUTH OF THE
 HV8001'NORTHWEST CORNER OF THE WHITE HOUSE AND IN LINE WITH A SERVICE
 HV8001'DRIVEWAY FOR DELIVERIES TO KITCHEN AND OTHER ROOMS.  WHITE HOUSE WALL
 HV8001'MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8002 ***********************************************************************
 HV8002  DESIGNATION -  S 14
 HV8002  PID         -  HV8002
 HV8002  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8002  COUNTRY     -  US
 HV8002  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8002
 HV8002                         *CURRENT SURVEY CONTROL
 HV8002  ______________________________________________________________________
 HV8002* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8002* NAVD 88 ORTHO HEIGHT -    17.116 (meters)       56.15  (feet) ADJUSTED
 HV8002  ______________________________________________________________________
 HV8002  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8002  DYNAMIC HEIGHT  -         17.107 (meters)       56.13  (feet) COMP
 HV8002  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8002
 HV8002  VERT ORDER      -  FIRST     CLASS 0
 HV8002
 HV8002.The horizontal coordinates were scaled from a map and have
 HV8002.an estimated accuracy of +/- 6 seconds.
 HV8002
 HV8002.The orthometric height was determined by differential leveling and
 HV8002.adjusted by the NATIONAL GEODETIC SURVEY
 HV8002.in June 1991.
 HV8002
 HV8002.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8002.GEOID18 height accuracy estimate available here.
 HV8002
 HV8002.Click photographs - Photos may exist for this station.
 HV8002
 HV8002.The dynamic height is computed by dividing the NAVD 88
 HV8002.geopotential number by the normal gravity value computed on the
 HV8002.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8002.degrees latitude (g = 980.6199 gals.).
 HV8002
 HV8002.The modeled gravity was interpolated from observed gravity values.
 HV8002
 HV8002
 HV8002_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8002
 HV8002                          SUPERSEDED SURVEY CONTROL
 HV8002
 HV8002  NGVD 29 (08/12/92)   17.347  (m)           56.91   (f) ADJUSTED    1 0
 HV8002
 HV8002.Superseded values are not recommended for survey control.
 HV8002
 HV8002.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8002.See file dsdata.pdf to determine how the superseded data were derived.
 HV8002
 HV8002_MARKER: Z = SEE DESCRIPTION
 HV8002_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8002_SP_SET: BUILDING
 HV8002_MARK LOGO: NONE
 HV8002_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8002_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8002
 HV8002  HISTORY     - Date     Condition        Report By
 HV8002  HISTORY     - 1949     MONUMENTED       CGS
 HV8002  HISTORY     - 1978     GOOD             NGS
 HV8002  HISTORY     - 1978     GOOD             NGS
 HV8002  HISTORY     - 1982     GOOD             NGS
 HV8002  HISTORY     - 19920615 GOOD             NGS
 HV8002
 HV8002                          STATION DESCRIPTION
 HV8002
 HV8002'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8002'IN WASHINGTON DC.
 HV8002'AT THE WHITE HOUSE, 3.8 FEET EAST OF THE NORTHWEST CORNER OF THE
 HV8002'WHITE HOUSE, AND 3.1 FEET ABOVE A BLACKTOP DELIVERY AREA.  WHITE HOUSE
 HV8002'WALL MARK.
 HV8002
 HV8002                          STATION RECOVERY (1978)
 HV8002
 HV8002'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8002'AT THE WHITE HOUSE, 3.8 FEET EAST OF THE NORTHWEST CORNER OF THE
 HV8002'WHITE HOUSE, AND 3.1 FEET ABOVE A BLACKTOP DELIVERY AREA.  WHITE HOUSE
 HV8002'WALL MARK.
 HV8002
 HV8002                          STATION RECOVERY (1982)
 HV8002
 HV8002'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8002'RECOVERED IN GOOD CONDITION.
 HV8002
 HV8002                          STATION RECOVERY (1992)
 HV8002
 HV8002'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8002'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 3.8 FEET (1.2 M) EAST OF THE
 HV8002'NORTHWEST CORNER OF THE WHITE HOUSE, AND 3.1 FEET (0.9 M) ABOVE A
 HV8002'BLACKTOP DELIVERY AREA.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8003 ***********************************************************************
 HV8003  DESIGNATION -  S 16
 HV8003  PID         -  HV8003
 HV8003  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8003  COUNTRY     -  US
 HV8003  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8003
 HV8003                         *CURRENT SURVEY CONTROL
 HV8003  ______________________________________________________________________
 HV8003* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8003* NAVD 88 ORTHO HEIGHT -    17.171 (meters)       56.34  (feet) ADJUSTED
 HV8003  ______________________________________________________________________
 HV8003  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8003  DYNAMIC HEIGHT  -         17.162 (meters)       56.31  (feet) COMP
 HV8003  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8003
 HV8003  VERT ORDER      -  FIRST     CLASS 0
 HV8003
 HV8003.The horizontal coordinates were scaled from a map and have
 HV8003.an estimated accuracy of +/- 6 seconds.
 HV8003
 HV8003.The orthometric height was determined by differential leveling and
 HV8003.adjusted by the NATIONAL GEODETIC SURVEY
 HV8003.in June 1991.
 HV8003
 HV8003.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8003.GEOID18 height accuracy estimate available here.
 HV8003
 HV8003.Click photographs - Photos may exist for this station.
 HV8003
 HV8003.The dynamic height is computed by dividing the NAVD 88
 HV8003.geopotential number by the normal gravity value computed on the
 HV8003.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8003.degrees latitude (g = 980.6199 gals.).
 HV8003
 HV8003.The modeled gravity was interpolated from observed gravity values.
 HV8003
 HV8003
 HV8003_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8003
 HV8003                          SUPERSEDED SURVEY CONTROL
 HV8003
 HV8003  NGVD 29 (08/12/92)   17.402  (m)           57.09   (f) ADJUSTED    1 0
 HV8003
 HV8003.Superseded values are not recommended for survey control.
 HV8003
 HV8003.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8003.See file dsdata.pdf to determine how the superseded data were derived.
 HV8003
 HV8003_MARKER: Z = SEE DESCRIPTION
 HV8003_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8003_SP_SET: BUILDING
 HV8003_MARK LOGO: NONE
 HV8003_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8003_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8003
 HV8003  HISTORY     - Date     Condition        Report By
 HV8003  HISTORY     - 1949     MONUMENTED       CGS
 HV8003  HISTORY     - 1978     GOOD             NGS
 HV8003  HISTORY     - 1978     GOOD             NGS
 HV8003  HISTORY     - 1982     GOOD             NGS
 HV8003  HISTORY     - 19920615 GOOD             NGS
 HV8003
 HV8003                          STATION DESCRIPTION
 HV8003
 HV8003'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8003'IN WASHINGTON DC.
 HV8003'AT THE WHITE HOUSE, 28.2 FEET EAST OF THE NORTHWEST CORNER OF THE
 HV8003'WHITE HOUSE, AND 12.7 FEET WEST OF THE CENTER OF THE DELIVERY ENTRANCE
 HV8003'UNDER THE NORTH PORTICO.  WHITE HOUSE WALL MARK.
 HV8003
 HV8003                          STATION RECOVERY (1978)
 HV8003
 HV8003'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8003'AT THE WHITE HOUSE, 28.2 FEET EAST OF THE NORTHWEST CORNER OF THE
 HV8003'WHITE HOUSE, AND 12.7 FEET WEST OF THE CENTER OF THE DELIVERY ENTRANCE
 HV8003'UNDER THE NORTH PORTICO.  WHITE HOUSE WALL MARK.
 HV8003
 HV8003                          STATION RECOVERY (1982)
 HV8003
 HV8003'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8003'RECOVERED IN GOOD CONDITION.
 HV8003
 HV8003                          STATION RECOVERY (1992)
 HV8003
 HV8003'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8003'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 28.2 FEET (8.6 M) EAST OF THE
 HV8003'NORTHWEST CORNER OF THE WHITE HOUSE, AND 12.7 FEET (3.9 M) WEST OF
 HV8003'THE CENTER OF THE DELIVERY ENTRANCE UNDER THE NORTH PORTICO.  WHITE
 HV8003'HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8004 ***********************************************************************
 HV8004  DESIGNATION -  S 16 A
 HV8004  PID         -  HV8004
 HV8004  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8004  COUNTRY     -  US
 HV8004  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8004
 HV8004                         *CURRENT SURVEY CONTROL
 HV8004  ______________________________________________________________________
 HV8004* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8004* NAVD 88 ORTHO HEIGHT -    19.595 (meters)       64.29  (feet) ADJUSTED
 HV8004  ______________________________________________________________________
 HV8004  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8004  DYNAMIC HEIGHT  -         19.585 (meters)       64.26  (feet) COMP
 HV8004  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8004
 HV8004  VERT ORDER      -  FIRST     CLASS 0
 HV8004
 HV8004.The horizontal coordinates were scaled from a map and have
 HV8004.an estimated accuracy of +/- 6 seconds.
 HV8004
 HV8004.The orthometric height was determined by differential leveling and
 HV8004.adjusted by the NATIONAL GEODETIC SURVEY
 HV8004.in June 1991.
 HV8004
 HV8004.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8004.GEOID18 height accuracy estimate available here.
 HV8004
 HV8004.Click photographs - Photos may exist for this station.
 HV8004
 HV8004.The dynamic height is computed by dividing the NAVD 88
 HV8004.geopotential number by the normal gravity value computed on the
 HV8004.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8004.degrees latitude (g = 980.6199 gals.).
 HV8004
 HV8004.The modeled gravity was interpolated from observed gravity values.
 HV8004
 HV8004
 HV8004_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8004
 HV8004                          SUPERSEDED SURVEY CONTROL
 HV8004
 HV8004  NGVD 29 (08/12/92)   19.826  (m)           65.05   (f) ADJUSTED    1 0
 HV8004
 HV8004.Superseded values are not recommended for survey control.
 HV8004
 HV8004.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8004.See file dsdata.pdf to determine how the superseded data were derived.
 HV8004
 HV8004_MARKER: Z = SEE DESCRIPTION
 HV8004_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8004_SP_SET: BUILDING
 HV8004_MARK LOGO: NONE
 HV8004_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8004_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8004
 HV8004  HISTORY     - Date     Condition        Report By
 HV8004  HISTORY     - 1949     MONUMENTED       CGS
 HV8004  HISTORY     - 1978     GOOD             NGS
 HV8004  HISTORY     - 1978     GOOD             NGS
 HV8004  HISTORY     - 1982     GOOD             NGS
 HV8004  HISTORY     - 19920615 GOOD             NGS
 HV8004
 HV8004                          STATION DESCRIPTION
 HV8004
 HV8004'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8004'IN WASHINGTON DC.
 HV8004'THE MARK IS 12 FT ABOVE BLACKTOP AREA.
 HV8004'AT THE WHITE HOUSE, 1 FOOT WEST OF THE NORTHWEST CORNER OF THE NORTH
 HV8004'PORTICO, 45 FEET EAST OF THE NORTHWEST CORNER OF THE WHITE HOUSE.
 HV8004'WHITE HOUSE WALL MARK.
 HV8004
 HV8004                          STATION RECOVERY (1978)
 HV8004
 HV8004'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8004'THE MARK IS 12 FT ABOVE BLACKTOP AREA.
 HV8004'AT THE WHITE HOUSE, 1 FOOT WEST OF THE NORTHWEST CORNER OF THE NORTH
 HV8004'PORTICO, 45 FEET EAST OF THE NORTHWEST CORNER OF THE WHITE HOUSE.
 HV8004'WHITE HOUSE WALL MARK.
 HV8004
 HV8004                          STATION RECOVERY (1982)
 HV8004
 HV8004'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8004'RECOVERED IN GOOD CONDITION.
 HV8004
 HV8004                          STATION RECOVERY (1992)
 HV8004
 HV8004'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8004'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 1 FOOT (0.3 M) WEST OF THE
 HV8004'NORTHWEST CORNER OF THE NORTH PORTICO, 45 FEET (13.7 M) EAST OF THE
 HV8004'NORTHWEST CORNER OF THE WHITE HOUSE.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8005 ***********************************************************************
 HV8005  DESIGNATION -  S 18
 HV8005  PID         -  HV8005
 HV8005  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8005  COUNTRY     -  US
 HV8005  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8005
 HV8005                         *CURRENT SURVEY CONTROL
 HV8005  ______________________________________________________________________
 HV8005* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8005* NAVD 88 ORTHO HEIGHT -    20.235 (meters)       66.39  (feet) ADJUSTED
 HV8005  ______________________________________________________________________
 HV8005  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8005  DYNAMIC HEIGHT  -         20.224 (meters)       66.35  (feet) COMP
 HV8005  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8005
 HV8005  VERT ORDER      -  FIRST     CLASS 0
 HV8005
 HV8005.The horizontal coordinates were scaled from a map and have
 HV8005.an estimated accuracy of +/- 6 seconds.
 HV8005
 HV8005.The orthometric height was determined by differential leveling and
 HV8005.adjusted by the NATIONAL GEODETIC SURVEY
 HV8005.in June 1991.
 HV8005
 HV8005.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8005.GEOID18 height accuracy estimate available here.
 HV8005
 HV8005.Click photographs - Photos may exist for this station.
 HV8005
 HV8005.The dynamic height is computed by dividing the NAVD 88
 HV8005.geopotential number by the normal gravity value computed on the
 HV8005.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8005.degrees latitude (g = 980.6199 gals.).
 HV8005
 HV8005.The modeled gravity was interpolated from observed gravity values.
 HV8005
 HV8005
 HV8005_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8005
 HV8005                          SUPERSEDED SURVEY CONTROL
 HV8005
 HV8005  NGVD 29 (08/12/92)   20.465  (m)           67.14   (f) ADJUSTED    1 0
 HV8005
 HV8005.Superseded values are not recommended for survey control.
 HV8005
 HV8005.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8005.See file dsdata.pdf to determine how the superseded data were derived.
 HV8005
 HV8005_MARKER: Z = SEE DESCRIPTION
 HV8005_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8005_SP_SET: BUILDING
 HV8005_MARK LOGO: NONE
 HV8005_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8005_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8005
 HV8005  HISTORY     - Date     Condition        Report By
 HV8005  HISTORY     - 1949     MONUMENTED       CGS
 HV8005  HISTORY     - 1978     GOOD             NGS
 HV8005  HISTORY     - 1978     GOOD             NGS
 HV8005  HISTORY     - 1982     GOOD             NGS
 HV8005  HISTORY     - 19920615 GOOD             NGS
 HV8005
 HV8005                          STATION DESCRIPTION
 HV8005
 HV8005'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8005'IN WASHINGTON DC.
 HV8005'AT THE WHITE HOUSE, IN THE FIRST PILLAR WEST OF THE NORTH ENTRANCE TO
 HV8005'THE WHITE HOUSE, 8.3 FEET WEST OF THE CENTER OF THE ENTRANCE.  WHITE
 HV8005'HOUSE WALL MARK.
 HV8005
 HV8005                          STATION RECOVERY (1978)
 HV8005
 HV8005'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8005'AT THE WHITE HOUSE, IN THE FIRST PILLAR WEST OF THE NORTH ENTRANCE TO
 HV8005'THE WHITE HOUSE, 8.3 FEET WEST OF THE CENTER OF THE ENTRANCE.  WHITE
 HV8005'HOUSE WALL MARK.
 HV8005
 HV8005                          STATION RECOVERY (1982)
 HV8005
 HV8005'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8005'RECOVERED IN GOOD CONDITION.
 HV8005
 HV8005                          STATION RECOVERY (1992)
 HV8005
 HV8005'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8005'IN WASHINGTON, D.C., AT THE WHITE HOUSE, IN THE FIRST PILLAR WEST OF
 HV8005'THE NORTH ENTRANCE TO THE WHITE HOUSE, 8.3 FEET (2.5 M) WEST OF THE
 HV8005'CENTER OF THE ENTRANCE.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8014 ***********************************************************************
 HV8014  DESIGNATION -  S 19
 HV8014  PID         -  HV8014
 HV8014  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8014  COUNTRY     -  US
 HV8014  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8014
 HV8014                         *CURRENT SURVEY CONTROL
 HV8014  ______________________________________________________________________
 HV8014* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8014* NAVD 88 ORTHO HEIGHT -    20.229 (meters)       66.37  (feet) ADJUSTED
 HV8014  ______________________________________________________________________
 HV8014  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8014  DYNAMIC HEIGHT  -         20.218 (meters)       66.33  (feet) COMP
 HV8014  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8014
 HV8014  VERT ORDER      -  FIRST     CLASS 0
 HV8014
 HV8014.The horizontal coordinates were scaled from a map and have
 HV8014.an estimated accuracy of +/- 6 seconds.
 HV8014
 HV8014.The orthometric height was determined by differential leveling and
 HV8014.adjusted by the NATIONAL GEODETIC SURVEY
 HV8014.in June 1991.
 HV8014
 HV8014.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8014.GEOID18 height accuracy estimate available here.
 HV8014
 HV8014.Click photographs - Photos may exist for this station.
 HV8014
 HV8014.The dynamic height is computed by dividing the NAVD 88
 HV8014.geopotential number by the normal gravity value computed on the
 HV8014.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8014.degrees latitude (g = 980.6199 gals.).
 HV8014
 HV8014.The modeled gravity was interpolated from observed gravity values.
 HV8014
 HV8014
 HV8014_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8014
 HV8014                          SUPERSEDED SURVEY CONTROL
 HV8014
 HV8014  NGVD 29 (08/12/92)   20.460  (m)           67.13   (f) ADJUSTED    1 0
 HV8014
 HV8014.Superseded values are not recommended for survey control.
 HV8014
 HV8014.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8014.See file dsdata.pdf to determine how the superseded data were derived.
 HV8014
 HV8014_MARKER: Z = SEE DESCRIPTION
 HV8014_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8014_SP_SET: BUILDING
 HV8014_MARK LOGO: NONE
 HV8014_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8014_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8014
 HV8014  HISTORY     - Date     Condition        Report By
 HV8014  HISTORY     - 1949     MONUMENTED       CGS
 HV8014  HISTORY     - 1978     GOOD             NGS
 HV8014  HISTORY     - 1978     GOOD             NGS
 HV8014  HISTORY     - 1982     GOOD             NGS
 HV8014  HISTORY     - 19920615 GOOD             NGS
 HV8014
 HV8014                          STATION DESCRIPTION
 HV8014
 HV8014'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8014'IN WASHINGTON DC.
 HV8014'AT THE WHITE HOUSE, SET IN THE FIRST PILLAR NORTH OF THE WHITE HOUSE
 HV8014'AND 8.4 FEET EAST OF THE CENTER OF THE NORTH ENTRANCE TO THE WHITE
 HV8014'HOUSE.  WHITE HOUSE WALL MARK.
 HV8014
 HV8014                          STATION RECOVERY (1978)
 HV8014
 HV8014'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8014'AT THE WHITE HOUSE, SET IN THE FIRST PILLAR NORTH OF THE WHITE HOUSE
 HV8014'AND 8.4 FEET EAST OF THE CENTER OF THE NORTH ENTRANCE TO THE WHITE
 HV8014'HOUSE.  WHITE HOUSE WALL MARK.
 HV8014
 HV8014                          STATION RECOVERY (1982)
 HV8014
 HV8014'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8014'RECOVERED IN GOOD CONDITION.
 HV8014
 HV8014                          STATION RECOVERY (1992)
 HV8014
 HV8014'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8014'IN WASHINGTON, D.C., AT THE WHITE HOUSE, SET IN THE FIRST PILLAR NORTH
 HV8014'OF THE WHITE HOUSE AND 8.4 FEET (2.6 M) EAST OF THE CENTER OF THE
 HV8014'NORTH ENTRANCE TO THE WHITE HOUSE.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8041 ***********************************************************************
 HV8041  DESIGNATION -  S 2
 HV8041  PID         -  HV8041
 HV8041  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8041  COUNTRY     -  US
 HV8041  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8041
 HV8041                         *CURRENT SURVEY CONTROL
 HV8041  ______________________________________________________________________
 HV8041* NAD 83(1986) POSITION- 38 53 48.     (N) 077 02 08.     (W)   SCALED
 HV8041* NAVD 88 ORTHO HEIGHT -    14.256 (meters)       46.77  (feet) ADJUSTED
 HV8041  ______________________________________________________________________
 HV8041  GEOID HEIGHT    -        -32.073 (meters)                     GEOID18
 HV8041  DYNAMIC HEIGHT  -         14.248 (meters)       46.75  (feet) COMP
 HV8041  MODELED GRAVITY -    980,098.0   (mgal)                       NAVD 88
 HV8041
 HV8041  VERT ORDER      -  FIRST     CLASS 0
 HV8041
 HV8041.The horizontal coordinates were scaled from a map and have
 HV8041.an estimated accuracy of +/- 6 seconds.
 HV8041
 HV8041.The orthometric height was determined by differential leveling and
 HV8041.adjusted by the NATIONAL GEODETIC SURVEY
 HV8041.in June 1991.
 HV8041
 HV8041.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8041.GEOID18 height accuracy estimate available here.
 HV8041
 HV8041.Click photographs - Photos may exist for this station.
 HV8041
 HV8041.The dynamic height is computed by dividing the NAVD 88
 HV8041.geopotential number by the normal gravity value computed on the
 HV8041.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8041.degrees latitude (g = 980.6199 gals.).
 HV8041
 HV8041.The modeled gravity was interpolated from observed gravity values.
 HV8041
 HV8041
 HV8041_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234072(NAD 83)
 HV8041
 HV8041                          SUPERSEDED SURVEY CONTROL
 HV8041
 HV8041  NGVD 29 (??/??/92)   14.492  (m)           47.55   (f) ADJ UNCH    1 0
 HV8041
 HV8041.Superseded values are not recommended for survey control.
 HV8041
 HV8041.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8041.See file dsdata.pdf to determine how the superseded data were derived.
 HV8041
 HV8041_MARKER: DB = BENCH MARK DISK
 HV8041_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV8041_STAMPING: S 2 1949
 HV8041_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV8041+STABILITY: SURFACE MOTION
 HV8041
 HV8041  HISTORY     - Date     Condition        Report By
 HV8041  HISTORY     - 1949     MONUMENTED       CGS
 HV8041
 HV8041                          STATION DESCRIPTION
 HV8041
 HV8041'DESCRIBED BY COAST AND GEODETIC SURVEY 1949
 HV8041'IN WASHINGTON DC.
 HV8041'AT WASHINGTON, D.C. ON THE WHITE HOUSE GROUNDS, ABOUT 200 FEET SOUTH
 HV8041'25 DEGRESS EAST FROM THE SOUTHEAST CORNER OF THE WHITE HOUSE,
 HV8041'SOUTHWEST OF THE CURVED DRIVEWAY, 40.5 FEET FROM A LAMPPOST LOCATED
 HV8041'ACROSS THE DRIVEWAY, 21.2 FEET SOUTHWEST OF THE SOUTH CORNER OF THE
 HV8041'RAISED BACK ON AN IRON GRATING OVER A CATCH BASIN LOCATED IN THE
 HV8041'SOUTHWEST EDGE OF THE DRIVEWAY, 20.2 FEET FROM THE MOST EASTERLY
 HV8041'CORNER OF A SHALLOW MARBLE TROUGH, AND (IN 1952) ABOUT 4 1/2 INCHES
 HV8041'BELOW THE SURFACE OF THE GROUND. A BRASS DISK, STAMPED 'S 2 1949' AND
 HV8041'SET IN THE TOP OF A CONCRETE POST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8015 ***********************************************************************
 HV8015  DESIGNATION -  S 21 A
 HV8015  PID         -  HV8015
 HV8015  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8015  COUNTRY     -  US
 HV8015  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8015
 HV8015                         *CURRENT SURVEY CONTROL
 HV8015  ______________________________________________________________________
 HV8015* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8015* NAVD 88 ORTHO HEIGHT -    19.605 (meters)       64.32  (feet) ADJUSTED
 HV8015  ______________________________________________________________________
 HV8015  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8015  DYNAMIC HEIGHT  -         19.595 (meters)       64.29  (feet) COMP
 HV8015  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8015
 HV8015  VERT ORDER      -  FIRST     CLASS 0
 HV8015
 HV8015.The horizontal coordinates were scaled from a map and have
 HV8015.an estimated accuracy of +/- 6 seconds.
 HV8015
 HV8015.The orthometric height was determined by differential leveling and
 HV8015.adjusted by the NATIONAL GEODETIC SURVEY
 HV8015.in June 1991.
 HV8015
 HV8015.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8015.GEOID18 height accuracy estimate available here.
 HV8015
 HV8015.Click photographs - Photos may exist for this station.
 HV8015
 HV8015.The dynamic height is computed by dividing the NAVD 88
 HV8015.geopotential number by the normal gravity value computed on the
 HV8015.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8015.degrees latitude (g = 980.6199 gals.).
 HV8015
 HV8015.The modeled gravity was interpolated from observed gravity values.
 HV8015
 HV8015
 HV8015_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8015
 HV8015                          SUPERSEDED SURVEY CONTROL
 HV8015
 HV8015  NGVD 29 (08/12/92)   19.836  (m)           65.08   (f) ADJUSTED    1 0
 HV8015
 HV8015.Superseded values are not recommended for survey control.
 HV8015
 HV8015.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8015.See file dsdata.pdf to determine how the superseded data were derived.
 HV8015
 HV8015_MARKER: Z = SEE DESCRIPTION
 HV8015_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8015_SP_SET: BUILDING
 HV8015_MARK LOGO: NONE
 HV8015_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8015_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8015
 HV8015  HISTORY     - Date     Condition        Report By
 HV8015  HISTORY     - 1949     MONUMENTED       CGS
 HV8015  HISTORY     - 1978     GOOD             NGS
 HV8015  HISTORY     - 1978     GOOD             NGS
 HV8015  HISTORY     - 1982     GOOD             NGS
 HV8015  HISTORY     - 19920615 GOOD             NGS
 HV8015
 HV8015                          STATION DESCRIPTION
 HV8015
 HV8015'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8015'IN WASHINGTON DC.
 HV8015'THE MARK IS 12 FT ABOVE BLACKTOP AREA.
 HV8015'AT THE WHITE HOUSE, 1.5 FEET EAST OF THE EAST WALL AND THE CORNER OF
 HV8015'THE WHITE HOUSE AND THE PORTICO, 44 FEET EAST OF THE CENTER OF THE
 HV8015'NORTH ENTRANCE TO THE WHITE HOUSE.  WHITE HOUSE WALL MARK.
 HV8015
 HV8015                          STATION RECOVERY (1978)
 HV8015
 HV8015'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8015'THE MARK IS 12 FT ABOVE BLACKTOP AREA.
 HV8015'AT THE WHITE HOUSE, 1.5 FEET EAST OF THE EAST WALL AND THE CORNER OF
 HV8015'THE WHITE HOUSE AND THE PORTICO, 44 FEET EAST OF THE CENTER OF THE
 HV8015'NORTH ENTRANCE TO THE WHITE HOUSE.  WHITE HOUSE WALL MARK.
 HV8015
 HV8015                          STATION RECOVERY (1982)
 HV8015
 HV8015'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8015'RECOVERED IN GOOD CONDITION.
 HV8015
 HV8015                          STATION RECOVERY (1992)
 HV8015
 HV8015'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8015'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 1.5 FEET (0.5 M) EAST OF THE
 HV8015'EAST WALL AND THE CORNER OF THE WHITE HOUSE AND THE PORTICO, 44 FEET
 HV8015'(13.4 M) EAST OF THE CENTER OF THE NORTH ENTRANCE TO THE WHITE HOUSE.
 HV8015'WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8035 ***********************************************************************
 HV8035  DESIGNATION -  S 22
 HV8035  PID         -  HV8035
 HV8035  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8035  COUNTRY     -  US
 HV8035  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8035
 HV8035                         *CURRENT SURVEY CONTROL
 HV8035  ______________________________________________________________________
 HV8035* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8035* NAVD 88 ORTHO HEIGHT -    17.158 (meters)       56.29  (feet) ADJUSTED
 HV8035  ______________________________________________________________________
 HV8035  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8035  DYNAMIC HEIGHT  -         17.149 (meters)       56.26  (feet) COMP
 HV8035  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8035
 HV8035  VERT ORDER      -  FIRST     CLASS 0
 HV8035
 HV8035.The horizontal coordinates were scaled from a map and have
 HV8035.an estimated accuracy of +/- 6 seconds.
 HV8035
 HV8035.The orthometric height was determined by differential leveling and
 HV8035.adjusted by the NATIONAL GEODETIC SURVEY
 HV8035.in June 1991.
 HV8035
 HV8035.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8035.GEOID18 height accuracy estimate available here.
 HV8035
 HV8035.Click photographs - Photos may exist for this station.
 HV8035
 HV8035.The dynamic height is computed by dividing the NAVD 88
 HV8035.geopotential number by the normal gravity value computed on the
 HV8035.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8035.degrees latitude (g = 980.6199 gals.).
 HV8035
 HV8035.The modeled gravity was interpolated from observed gravity values.
 HV8035
 HV8035
 HV8035_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8035
 HV8035                          SUPERSEDED SURVEY CONTROL
 HV8035
 HV8035  NGVD 29 (08/12/92)   17.389  (m)           57.05   (f) ADJUSTED    1 0
 HV8035
 HV8035.Superseded values are not recommended for survey control.
 HV8035
 HV8035.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8035.See file dsdata.pdf to determine how the superseded data were derived.
 HV8035
 HV8035_MARKER: Z = SEE DESCRIPTION
 HV8035_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8035_SP_SET: BUILDING
 HV8035_MARK LOGO: NONE
 HV8035_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8035_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8035
 HV8035  HISTORY     - Date     Condition        Report By
 HV8035  HISTORY     - 1949     MONUMENTED       CGS
 HV8035  HISTORY     - 1978     GOOD             NGS
 HV8035  HISTORY     - 1978     GOOD             NGS
 HV8035  HISTORY     - 1982     GOOD             NGS
 HV8035  HISTORY     - 19920615 GOOD             NGS
 HV8035
 HV8035                          STATION DESCRIPTION
 HV8035
 HV8035'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8035'IN WASHINGTON DC.
 HV8035'AT THE WHITE HOUSE, 19.2 FEET WEST OF THE NORTHEAST CORNER OF THE
 HV8035'WHITE HOUSE IN THE ALLEY.  WHITE HOUSE WALL MARK.
 HV8035
 HV8035                          STATION RECOVERY (1978)
 HV8035
 HV8035'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8035'AT THE WHITE HOUSE, 19.2 FEET WEST OF THE NORTHEAST CORNER OF THE
 HV8035'WHITE HOUSE IN THE ALLEY.  WHITE HOUSE WALL MARK.
 HV8035
 HV8035                          STATION RECOVERY (1982)
 HV8035
 HV8035'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8035'RECOVERED IN GOOD CONDITION.
 HV8035
 HV8035                          STATION RECOVERY (1992)
 HV8035
 HV8035'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8035'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 19.2 FEET (5.9 M) WEST OF THE
 HV8035'NORTHEAST CORNER OF THE WHITE HOUSE IN THE ALLEY.  WHITE HOUSE WALL
 HV8035'MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8033 ***********************************************************************
 HV8033  DESIGNATION -  S 24
 HV8033  PID         -  HV8033
 HV8033  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8033  COUNTRY     -  US
 HV8033  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8033
 HV8033                         *CURRENT SURVEY CONTROL
 HV8033  ______________________________________________________________________
 HV8033* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8033* NAVD 88 ORTHO HEIGHT -    17.151 (meters)       56.27  (feet) ADJUSTED
 HV8033  ______________________________________________________________________
 HV8033  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8033  DYNAMIC HEIGHT  -         17.142 (meters)       56.24  (feet) COMP
 HV8033  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8033
 HV8033  VERT ORDER      -  FIRST     CLASS 0
 HV8033
 HV8033.The horizontal coordinates were scaled from a map and have
 HV8033.an estimated accuracy of +/- 6 seconds.
 HV8033
 HV8033.The orthometric height was determined by differential leveling and
 HV8033.adjusted by the NATIONAL GEODETIC SURVEY
 HV8033.in June 1991.
 HV8033
 HV8033.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8033.GEOID18 height accuracy estimate available here.
 HV8033
 HV8033.Click photographs - Photos may exist for this station.
 HV8033
 HV8033.The dynamic height is computed by dividing the NAVD 88
 HV8033.geopotential number by the normal gravity value computed on the
 HV8033.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8033.degrees latitude (g = 980.6199 gals.).
 HV8033
 HV8033.The modeled gravity was interpolated from observed gravity values.
 HV8033
 HV8033
 HV8033_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8033
 HV8033                          SUPERSEDED SURVEY CONTROL
 HV8033
 HV8033  NGVD 29 (08/12/92)   17.383  (m)           57.03   (f) ADJUSTED    1 0
 HV8033
 HV8033.Superseded values are not recommended for survey control.
 HV8033
 HV8033.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8033.See file dsdata.pdf to determine how the superseded data were derived.
 HV8033
 HV8033_MARKER: Z = SEE DESCRIPTION
 HV8033_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8033_SP_SET: BUILDING
 HV8033_MARK LOGO: NONE
 HV8033_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8033_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8033_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV8033+SATELLITE: SATELLITE OBSERVATIONS - June 15, 1992
 HV8033
 HV8033  HISTORY     - Date     Condition        Report By
 HV8033  HISTORY     - 1949     MONUMENTED       CGS
 HV8033  HISTORY     - 1978     GOOD             NGS
 HV8033  HISTORY     - 1978     GOOD             NGS
 HV8033  HISTORY     - 1982     GOOD             NGS
 HV8033  HISTORY     - 19920615 GOOD             NGS
 HV8033
 HV8033                          STATION DESCRIPTION
 HV8033
 HV8033'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8033'IN WASHINGTON DC.
 HV8033'AT THE WHITE HOUSE, 4.4 FEET SOUTH OF THE NORTHEAST CORNER OF THE
 HV8033'WHITE HOUSE IN THE ALLEY.  WHITE HOUSE WALL MARK.
 HV8033
 HV8033                          STATION RECOVERY (1978)
 HV8033
 HV8033'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8033'AT THE WHITE HOUSE, 4.4 FEET SOUTH OF THE NORTHEAST CORNER OF THE
 HV8033'WHITE HOUSE IN THE ALLEY.  WHITE HOUSE WALL MARK.
 HV8033
 HV8033                          STATION RECOVERY (1982)
 HV8033
 HV8033'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8033'RECOVERED IN GOOD CONDITION.
 HV8033
 HV8033                          STATION RECOVERY (1992)
 HV8033
 HV8033'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8033'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 4.4 FEET (1.3 M) SOUTH OF THE
 HV8033'NORTHEAST CORNER OF THE WHITE HOUSE IN THE ALLEY.  WHITE HOUSE WALL
 HV8033'MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8030 ***********************************************************************
 HV8030  DESIGNATION -  S 26
 HV8030  PID         -  HV8030
 HV8030  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8030  COUNTRY     -  US
 HV8030  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8030
 HV8030                         *CURRENT SURVEY CONTROL
 HV8030  ______________________________________________________________________
 HV8030* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8030* NAVD 88 ORTHO HEIGHT -    20.981 (meters)       68.84  (feet) ADJUSTED
 HV8030  ______________________________________________________________________
 HV8030  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8030  DYNAMIC HEIGHT  -         20.969 (meters)       68.80  (feet) COMP
 HV8030  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8030
 HV8030  VERT ORDER      -  FIRST     CLASS 0
 HV8030
 HV8030.The horizontal coordinates were scaled from a map and have
 HV8030.an estimated accuracy of +/- 6 seconds.
 HV8030
 HV8030.The orthometric height was determined by differential leveling and
 HV8030.adjusted by the NATIONAL GEODETIC SURVEY
 HV8030.in June 1991.
 HV8030
 HV8030.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8030.GEOID18 height accuracy estimate available here.
 HV8030
 HV8030.Click photographs - Photos may exist for this station.
 HV8030
 HV8030.The dynamic height is computed by dividing the NAVD 88
 HV8030.geopotential number by the normal gravity value computed on the
 HV8030.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8030.degrees latitude (g = 980.6199 gals.).
 HV8030
 HV8030.The modeled gravity was interpolated from observed gravity values.
 HV8030
 HV8030
 HV8030_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8030
 HV8030                          SUPERSEDED SURVEY CONTROL
 HV8030
 HV8030  NGVD 29 (08/12/92)   21.212  (m)           69.59   (f) ADJUSTED    1 0
 HV8030
 HV8030.Superseded values are not recommended for survey control.
 HV8030
 HV8030.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8030.See file dsdata.pdf to determine how the superseded data were derived.
 HV8030
 HV8030_MARKER: Z = SEE DESCRIPTION
 HV8030_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8030_SP_SET: BUILDING
 HV8030_MARK LOGO: NONE
 HV8030_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8030_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8030
 HV8030  HISTORY     - Date     Condition        Report By
 HV8030  HISTORY     - 1949     MONUMENTED       CGS
 HV8030  HISTORY     - 1978     GOOD             NGS
 HV8030  HISTORY     - 1978     GOOD             NGS
 HV8030  HISTORY     - 1982     GOOD             NGS
 HV8030  HISTORY     - 19920615 GOOD             NGS
 HV8030
 HV8030                          STATION DESCRIPTION
 HV8030
 HV8030'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8030'IN WASHINGTON DC.
 HV8030'AT THE WHITE HOUSE, SET IN THE EAST OUTSIDE WALL OF THE EAST BALLROOM
 HV8030'OF THE WHITE HOUSE, 11.4 FEET SOUTH OF THE ENTRANCE LEADING TO THE
 HV8030'ROOF OF THE EAST WING.  WHITE HOUSE WALL MARK.
 HV8030
 HV8030                          STATION RECOVERY (1978)
 HV8030
 HV8030'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8030'AT THE WHITE HOUSE, SET IN THE EAST OUTSIDE WALL OF THE EAST BALLROOM
 HV8030'OF THE WHITE HOUSE, 11.4 FEET SOUTH OF THE ENTRANCE LEADING TO THE
 HV8030'ROOF OF THE EAST WING.  WHITE HOUSE WALL MARK.
 HV8030
 HV8030                          STATION RECOVERY (1982)
 HV8030
 HV8030'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8030'RECOVERED IN GOOD CONDITION.  NEW DESCRIPTION FOLLOWS.  AT THE WHITE
 HV8030'HOUSE SET IN THE OUTSIDE OF THE EAST WALL OF THE EAST BALLROOM OF THE
 HV8030'WHITE HOUSE, 2.47 METERS (11.4 FT) SOUTH OF THE ENTRANCE LEADING TO
 HV8030'THE ROOF OF THE EAST WING.  MARK IS THE TOP OF THE KNOB AT THE END
 HV8030'OF A 1 INCH DIAMETER BRASS PIN THAT PROTRUDES ABOUT 6 INCHES FROM THE
 HV8030'WALL, 1 FT ABOVE THE ROOF OF THE EAST WING.
 HV8030
 HV8030                          STATION RECOVERY (1992)
 HV8030
 HV8030'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8030'IN WASHINGTON, D.C., AT THE WHITE HOUSE, SET IN THE OUTSIDE OF THE
 HV8030'EAST WALL OF THE EAST BALLROOM OF THE WHITE HOUSE, 2.47 METERS
 HV8030'(8.10 FT) SOUTH OF THE ENTRANCE LEADING TO THE ROOF OF THE EAST WING.
 HV8030'MARK IS THE TOP OF THE KNOB AT THE END OF A 1-INCH DIAMETER BRASS
 HV8030'PIN THAT PROTRUDES ABOUT 6 INCHES FROM THE WALL, 1 FOOT (0.3 M) ABOVE
 HV8030'THE ROOF OF THE EAST WING.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8031 ***********************************************************************
 HV8031  DESIGNATION -  S 27
 HV8031  PID         -  HV8031
 HV8031  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8031  COUNTRY     -  US
 HV8031  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8031
 HV8031                         *CURRENT SURVEY CONTROL
 HV8031  ______________________________________________________________________
 HV8031* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8031* NAVD 88 ORTHO HEIGHT -    20.980 (meters)       68.83  (feet) ADJUSTED
 HV8031  ______________________________________________________________________
 HV8031  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8031  DYNAMIC HEIGHT  -         20.969 (meters)       68.80  (feet) COMP
 HV8031  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8031
 HV8031  VERT ORDER      -  FIRST     CLASS 0
 HV8031
 HV8031.The horizontal coordinates were scaled from a map and have
 HV8031.an estimated accuracy of +/- 6 seconds.
 HV8031
 HV8031.The orthometric height was determined by differential leveling and
 HV8031.adjusted by the NATIONAL GEODETIC SURVEY
 HV8031.in June 1991.
 HV8031
 HV8031.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8031.GEOID18 height accuracy estimate available here.
 HV8031
 HV8031.Click photographs - Photos may exist for this station.
 HV8031
 HV8031.The dynamic height is computed by dividing the NAVD 88
 HV8031.geopotential number by the normal gravity value computed on the
 HV8031.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8031.degrees latitude (g = 980.6199 gals.).
 HV8031
 HV8031.The modeled gravity was interpolated from observed gravity values.
 HV8031
 HV8031
 HV8031_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8031
 HV8031                          SUPERSEDED SURVEY CONTROL
 HV8031
 HV8031  NGVD 29 (08/12/92)   21.212  (m)           69.59   (f) ADJUSTED    1 0
 HV8031
 HV8031.Superseded values are not recommended for survey control.
 HV8031
 HV8031.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8031.See file dsdata.pdf to determine how the superseded data were derived.
 HV8031
 HV8031_MARKER: Z = SEE DESCRIPTION
 HV8031_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8031_SP_SET: BUILDING
 HV8031_MARK LOGO: NONE
 HV8031_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8031_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8031
 HV8031  HISTORY     - Date     Condition        Report By
 HV8031  HISTORY     - 1949     MONUMENTED       CGS
 HV8031  HISTORY     - 1978     GOOD             NGS
 HV8031  HISTORY     - 1978     GOOD             NGS
 HV8031  HISTORY     - 1982     GOOD             NGS
 HV8031  HISTORY     - 19920615 GOOD             NGS
 HV8031
 HV8031                          STATION DESCRIPTION
 HV8031
 HV8031'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8031'IN WASHINGTON DC.
 HV8031'AT THE WHITE HOUSE, SET IN THE EAST OUTSIDE WALL OF THE EAST BALLROOM
 HV8031'OF THE WHITE HOUSE, 26 FEET SOUTH OF THE ENTRANCE LEADING TO ROOF OF
 HV8031'EAST WING.  WHITE HOUSE WALL MARK.
 HV8031
 HV8031                          STATION RECOVERY (1978)
 HV8031
 HV8031'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8031'AT THE WHITE HOUSE, SET IN THE EAST OUTSIDE WALL OF THE EAST BALLROOM
 HV8031'OF THE WHITE HOUSE, 26 FEET SOUTH OF THE ENTRANCE LEADING TO ROOF OF
 HV8031'EAST WING.  WHITE HOUSE WALL MARK.
 HV8031
 HV8031                          STATION RECOVERY (1982)
 HV8031
 HV8031'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8031'RECOVERED IN GOOD CONDITION.  NEW DESCRIPTION FOLLOWS.  AT THE WHITE
 HV8031'WHITE SET IN THE OUTSIDE OF THE EAST WALL OF THE EAST BALLROOM OF THE
 HV8031'WHITE HOUSE, 10.97 METERS (36 FT) SOUTH OF THE ENTRANCE LEADING TO
 HV8031'THE ROOF OF THE EAST WING.  MARK IS THE TOP OF THE KNOB AT THE END
 HV8031'OF A 1 INCH DIAMETER BRASS PIN THAT PROTRUDES ABOUT 6 INCHES FROM
 HV8031'THE WALL 1 FT ABOVE THE ROOF OF THE EAST WING.
 HV8031
 HV8031                          STATION RECOVERY (1992)
 HV8031
 HV8031'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8031'IN WASHINGTON, D.C., AT THE WHITE HOUSE, SET IN THE OUTSIDE OF THE
 HV8031'EAST WALL OF THE EAST BALLROOM OF THE WHITE HOUSE, 10.97 METERS
 HV8031'(35.99 FT) SOUTH OF THE ENTRANCE LEADING TO THE ROOF OF THE EAST
 HV8031'WING.  MARK IS THE TOP OF THE KNOB AT THE END OF A 1-INCH DIAMETER
 HV8031'BRASS PIN THAT PROTRUDES ABOUT 6 INCHES FROM THE WALL 1 FT (0.3 M)
 HV8031'ABOVE THE ROOF OF THE EAST WING.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8027 ***********************************************************************
 HV8027  DESIGNATION -  S 28
 HV8027  PID         -  HV8027
 HV8027  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8027  COUNTRY     -  US
 HV8027  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8027
 HV8027                         *CURRENT SURVEY CONTROL
 HV8027  ______________________________________________________________________
 HV8027* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8027* NAVD 88 ORTHO HEIGHT -    16.900 (meters)       55.45  (feet) ADJUSTED
 HV8027  ______________________________________________________________________
 HV8027  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8027  DYNAMIC HEIGHT  -         16.891 (meters)       55.42  (feet) COMP
 HV8027  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8027
 HV8027  VERT ORDER      -  FIRST     CLASS 0
 HV8027
 HV8027.The horizontal coordinates were scaled from a map and have
 HV8027.an estimated accuracy of +/- 6 seconds.
 HV8027
 HV8027.The orthometric height was determined by differential leveling and
 HV8027.adjusted by the NATIONAL GEODETIC SURVEY
 HV8027.in June 1991.
 HV8027
 HV8027.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8027.GEOID18 height accuracy estimate available here.
 HV8027
 HV8027.Click photographs - Photos may exist for this station.
 HV8027
 HV8027.The dynamic height is computed by dividing the NAVD 88
 HV8027.geopotential number by the normal gravity value computed on the
 HV8027.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8027.degrees latitude (g = 980.6199 gals.).
 HV8027
 HV8027.The modeled gravity was interpolated from observed gravity values.
 HV8027
 HV8027
 HV8027_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8027
 HV8027                          SUPERSEDED SURVEY CONTROL
 HV8027
 HV8027  NGVD 29 (08/12/92)   17.133  (m)           56.21   (f) ADJUSTED    1 0
 HV8027
 HV8027.Superseded values are not recommended for survey control.
 HV8027
 HV8027.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8027.See file dsdata.pdf to determine how the superseded data were derived.
 HV8027
 HV8027_MARKER: Z = SEE DESCRIPTION
 HV8027_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8027_SP_SET: BUILDING
 HV8027_MARK LOGO: NONE
 HV8027_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8027_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8027
 HV8027  HISTORY     - Date     Condition        Report By
 HV8027  HISTORY     - 1949     MONUMENTED       CGS
 HV8027  HISTORY     - 1978     GOOD             NGS
 HV8027  HISTORY     - 1978     GOOD             NGS
 HV8027  HISTORY     - 1982     GOOD             NGS
 HV8027  HISTORY     - 19920615 GOOD             NGS
 HV8027
 HV8027                          STATION DESCRIPTION
 HV8027
 HV8027'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8027'IN WASHINGTON DC.
 HV8027'AT THE WHITE HOUSE, 4.3 FEET N OF SE CORNER IN THE NW SECTION OF THE
 HV8027'EAST GARDEN, 3 FEET OFF THE GROUND IN THE EAST WALL.  WHITE HOUSE
 HV8027'WALL MARK.
 HV8027
 HV8027                          STATION RECOVERY (1978)
 HV8027
 HV8027'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8027'AT THE WHITE HOUSE, 4.3 FEET N OF SE CORNER IN THE NW SECTION OF THE
 HV8027'EAST GARDEN, 3 FEET OFF THE GROUND IN THE SOUTH WALL.  WHITE HOUSE
 HV8027'WALL MARK.
 HV8027
 HV8027                          STATION RECOVERY (1982)
 HV8027
 HV8027'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8027'RECOVERED IN GOOD CONDITION.
 HV8027
 HV8027                          STATION RECOVERY (1992)
 HV8027
 HV8027'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8027'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 4.3 FEET (1.3 M) NORTH OF
 HV8027'SOUTHEAST CORNER IN THE NORTHWEST SECTION OF THE EAST GARDEN, 3 FEET
 HV8027'(0.9 M) OFF THE GROUND IN THE EAST WALL.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8025 ***********************************************************************
 HV8025  DESIGNATION -  S 3
 HV8025  PID         -  HV8025
 HV8025  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8025  COUNTRY     -  US
 HV8025  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8025
 HV8025                         *CURRENT SURVEY CONTROL
 HV8025  ______________________________________________________________________
 HV8025* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8025* NAVD 88 ORTHO HEIGHT -    17.024 (meters)       55.85  (feet) ADJUSTED
 HV8025  ______________________________________________________________________
 HV8025  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8025  DYNAMIC HEIGHT  -         17.015 (meters)       55.82  (feet) COMP
 HV8025  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8025
 HV8025  VERT ORDER      -  FIRST     CLASS 0
 HV8025
 HV8025.The horizontal coordinates were scaled from a map and have
 HV8025.an estimated accuracy of +/- 6 seconds.
 HV8025
 HV8025.The orthometric height was determined by differential leveling and
 HV8025.adjusted by the NATIONAL GEODETIC SURVEY
 HV8025.in June 1991.
 HV8025
 HV8025.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8025.GEOID18 height accuracy estimate available here.
 HV8025
 HV8025.Click photographs - Photos may exist for this station.
 HV8025
 HV8025.The dynamic height is computed by dividing the NAVD 88
 HV8025.geopotential number by the normal gravity value computed on the
 HV8025.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8025.degrees latitude (g = 980.6199 gals.).
 HV8025
 HV8025.The modeled gravity was interpolated from observed gravity values.
 HV8025
 HV8025
 HV8025_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8025
 HV8025                          SUPERSEDED SURVEY CONTROL
 HV8025
 HV8025  NGVD 29 (08/12/92)   17.257  (m)           56.62   (f) ADJUSTED    1 0
 HV8025
 HV8025.Superseded values are not recommended for survey control.
 HV8025
 HV8025.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8025.See file dsdata.pdf to determine how the superseded data were derived.
 HV8025
 HV8025_MARKER: Z = SEE DESCRIPTION
 HV8025_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8025_SP_SET: BUILDING
 HV8025_MARK LOGO: NONE
 HV8025_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8025_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8025
 HV8025  HISTORY     - Date     Condition        Report By
 HV8025  HISTORY     - 1949     MONUMENTED       CGS
 HV8025  HISTORY     - 1978     GOOD             NGS
 HV8025  HISTORY     - 1978     GOOD             NGS
 HV8025  HISTORY     - 1982     GOOD             NGS
 HV8025  HISTORY     - 19920615 GOOD             NGS
 HV8025
 HV8025                          STATION DESCRIPTION
 HV8025
 HV8025'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8025'IN WASHINGTON DC.
 HV8025'AT THE WHITE HOUSE, 30 FEET WEST FROM THE SE CORNER OF WHITE HOUSE IN
 HV8025'THE NW SECTION OF THE EAST GARDEN, 3 FEET ABOVE GROUND IN THE SOUTH
 HV8025'WALL.  WHITE HOUSE WALL MARK.
 HV8025
 HV8025                          STATION RECOVERY (1978)
 HV8025
 HV8025'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8025'AT THE WHITE HOUSE, 30 FEET WEST FROM THE SE CORNER OF WHITE HOUSE IN
 HV8025'THE NW SECTION OF THE EAST GARDEN, 3 FEET ABOVE GROUND IN THE SOUTH
 HV8025'WALL.  WHITE HOUSE WALL MARK.
 HV8025
 HV8025                          STATION RECOVERY (1982)
 HV8025
 HV8025'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8025'RECOVERED IN GOOD CONDITION.
 HV8025
 HV8025                          STATION RECOVERY (1992)
 HV8025
 HV8025'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8025'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 30 FEET (9.1 M) WEST FROM THE
 HV8025'SE CORNER OF WHITE HOUSE IN THE NW SECTION OF THE EAST GARDEN, 3 FEET
 HV8025'(0.9 M) ABOVE GROUND IN THE SOUTH WALL.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1832 ***********************************************************************
 HV1832  DESIGNATION -  S 4
 HV1832  PID         -  HV1832
 HV1832  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1832  COUNTRY     -  US
 HV1832  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1832
 HV1832                         *CURRENT SURVEY CONTROL
 HV1832  ______________________________________________________________________
 HV1832* NAD 83(1986) POSITION- 38 53 56.     (N) 077 02 11.     (W)   SCALED
 HV1832* NAVD 88 ORTHO HEIGHT -    16.398 (meters)       53.80  (feet) ADJUSTED
 HV1832  ______________________________________________________________________
 HV1832  GEOID HEIGHT    -        -32.068 (meters)                     GEOID18
 HV1832  DYNAMIC HEIGHT  -         16.390 (meters)       53.77  (feet) COMP
 HV1832  MODELED GRAVITY -    980,097.9   (mgal)                       NAVD 88
 HV1832
 HV1832  VERT ORDER      -  FIRST     CLASS 0
 HV1832
 HV1832.The horizontal coordinates were scaled from a map and have
 HV1832.an estimated accuracy of +/- 6 seconds.
 HV1832
 HV1832.The orthometric height was determined by differential leveling and
 HV1832.adjusted by the NATIONAL GEODETIC SURVEY
 HV1832.in June 1991.
 HV1832
 HV1832.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1832.GEOID18 height accuracy estimate available here.
 HV1832
 HV1832.Click photographs - Photos may exist for this station.
 HV1832
 HV1832.The dynamic height is computed by dividing the NAVD 88
 HV1832.geopotential number by the normal gravity value computed on the
 HV1832.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1832.degrees latitude (g = 980.6199 gals.).
 HV1832
 HV1832.The modeled gravity was interpolated from observed gravity values.
 HV1832
 HV1832
 HV1832_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234075(NAD 83)
 HV1832
 HV1832                          SUPERSEDED SURVEY CONTROL
 HV1832
 HV1832  NGVD 29 (08/12/92)   16.631  (m)           54.56   (f) ADJUSTED    1 0
 HV1832  NGVD 29 (??/??/87)   16.631  (m)           54.56   (f) SUPERSEDED  1 0
 HV1832
 HV1832.Superseded values are not recommended for survey control.
 HV1832
 HV1832.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1832.See file dsdata.pdf to determine how the superseded data were derived.
 HV1832
 HV1832_MARKER: Z = SEE DESCRIPTION
 HV1832_SETTING: 66 = SET IN ROCK OUTCROP
 HV1832_MARK LOGO: NONE
 HV1832_PROJECTION: FLUSH
 HV1832_MAGNETIC: P = MARKER IS A STEEL PIPE
 HV1832_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 HV1832+STABILITY: POSITION/ELEVATION WELL
 HV1832
 HV1832  HISTORY     - Date     Condition        Report By
 HV1832  HISTORY     - 1949     MONUMENTED       WMATA
 HV1832  HISTORY     - 1974     GOOD             NGS
 HV1832  HISTORY     - 1978     GOOD             NGS
 HV1832  HISTORY     - 1978     GOOD             NGS
 HV1832  HISTORY     - 1979     GOOD             NGS
 HV1832  HISTORY     - 1984     GOOD             NGS
 HV1832  HISTORY     - 1989     MARK NOT FOUND   USPSQD
 HV1832  HISTORY     - 19920615 GOOD             NGS
 HV1832  HISTORY     - 19980928 GOOD             NGS
 HV1832  HISTORY     - 20090319 GOOD             GEOCAC
 HV1832
 HV1832                          STATION DESCRIPTION
 HV1832
 HV1832'DESCRIBED BY NATIONAL GEODETIC SURVEY 1974
 HV1832'IN WASHINGTON.
 HV1832'THE BMS IN THE NORTH SIDEWALK ON PENNSYLVANIA AVE. ACROSS THE
 HV1832'WHITE HOUSE IN LAFAYETTE PARK.  1.5 METERS FROM THE NORTH CURB
 HV1832'OF PA. AVE., AND 7 METERS EAST FROM THE IMAGINARY LINE BETWEEN
 HV1832'THE FLAG POLE ON THE WHITE HOUSE AND THE STATUE OF CLARK MILLS
 HV1832'IN THE CENTER OF THE PARK.  THE MARK CONSISTS OF A 3 1/2 IN.
 HV1832'DIA. OUTER PIPE SET ON THE BEDROCK AND A 2 IN. DIA. INNER PIPE
 HV1832'CEMENTED INTO THE BEDROCK.  A 2 1/8 IN. DIA. STAINLESS STEEL
 HV1832'BALL IS WELDED TO THE TOP OF THE INNER PIPE.  A ROUND CAST IRON
 HV1832'BOX WITH A COVER SET FLUSH WITH THE SIDEWALK PROTECTS THE BM.
 HV1832
 HV1832                          STATION RECOVERY (1978)
 HV1832
 HV1832'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV1832'RECOVERED IN GOOD CONDITION.
 HV1832
 HV1832                          STATION RECOVERY (1978)
 HV1832
 HV1832'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV1832'RECOVERED IN GOOD CONDITION.
 HV1832
 HV1832                          STATION RECOVERY (1979)
 HV1832
 HV1832'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1832'RECOVERED IN GOOD CONDITION.
 HV1832
 HV1832                          STATION RECOVERY (1984)
 HV1832
 HV1832'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984
 HV1832'RECOVERED IN GOOD CONDITION.
 HV1832
 HV1832                          STATION RECOVERY (1989)
 HV1832
 HV1832'RECOVERY NOTE BY US POWER SQUADRON 1989 (NJP)
 HV1832'MARK NOT FOUND.
 HV1832
 HV1832                          STATION RECOVERY (1992)
 HV1832
 HV1832'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1832'IN WASHINGTON, D.C., IN LAFAYETTE PARK ACROSS FROM THE WHITE HOUSE, IN
 HV1832'THE NORTH SIDEWALK OF PENNSYLVANIA AVENUE, A 2 1/8-INCH STAINLESS
 HV1832'STEEL BALL WELDED TO THE TOP OF A 2-INCH METAL PIPE CEMENTED INTO
 HV1832'BEDROCK AND SURROUNDED BY A 3 1/2-INCH METAL PIPE SET ON THE BEDROCK,
 HV1832'1.5 M (4.9 FT) NORTH OF THE NORTH CURB OF THE AVENUE, AND 7.0 M
 HV1832'(23.0 FT) EAST OF A PROJECTED LINE FROM THE FLAGPOLE AT THE WHITE
 HV1832'HOUSE AND A STATUE OF CLARK MILLS IN THE CENTER OF THE PARK.
 HV1832'NOTE--ACCESS TO THE DATUM POINT IS THROUGH A CAST IRON COVER THAT IS
 HV1832'FLUSH WITH THE SIDEWALK.
 HV1832
 HV1832                          STATION RECOVERY (1998)
 HV1832
 HV1832'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1998 (RLA)
 HV1832'RECOVERED AS DESCRIBED.
 HV1832
 HV1832                          STATION RECOVERY (2009)
 HV1832
 HV1832'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV1832'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8016 ***********************************************************************
 HV8016  DESIGNATION -  S 6
 HV8016  PID         -  HV8016
 HV8016  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8016  COUNTRY     -  US
 HV8016  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8016
 HV8016                         *CURRENT SURVEY CONTROL
 HV8016  ______________________________________________________________________
 HV8016* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8016* NAVD 88 ORTHO HEIGHT -    17.002 (meters)       55.78  (feet) ADJUSTED
 HV8016  ______________________________________________________________________
 HV8016  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8016  DYNAMIC HEIGHT  -         16.993 (meters)       55.75  (feet) COMP
 HV8016  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8016
 HV8016  VERT ORDER      -  FIRST     CLASS 0
 HV8016
 HV8016.The horizontal coordinates were scaled from a map and have
 HV8016.an estimated accuracy of +/- 6 seconds.
 HV8016
 HV8016.The orthometric height was determined by differential leveling and
 HV8016.adjusted by the NATIONAL GEODETIC SURVEY
 HV8016.in June 1991.
 HV8016
 HV8016.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8016.GEOID18 height accuracy estimate available here.
 HV8016
 HV8016.Click photographs - Photos may exist for this station.
 HV8016
 HV8016.The dynamic height is computed by dividing the NAVD 88
 HV8016.geopotential number by the normal gravity value computed on the
 HV8016.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8016.degrees latitude (g = 980.6199 gals.).
 HV8016
 HV8016.The modeled gravity was interpolated from observed gravity values.
 HV8016
 HV8016
 HV8016_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8016
 HV8016                          SUPERSEDED SURVEY CONTROL
 HV8016
 HV8016  NGVD 29 (08/12/92)   17.235  (m)           56.55   (f) ADJUSTED    1 0
 HV8016
 HV8016.Superseded values are not recommended for survey control.
 HV8016
 HV8016.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8016.See file dsdata.pdf to determine how the superseded data were derived.
 HV8016
 HV8016_MARKER: Z = SEE DESCRIPTION
 HV8016_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8016_SP_SET: BUILDING
 HV8016_MARK LOGO: NONE
 HV8016_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8016_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8016
 HV8016  HISTORY     - Date     Condition        Report By
 HV8016  HISTORY     - 1949     MONUMENTED       CGS
 HV8016  HISTORY     - 1978     GOOD             NGS
 HV8016  HISTORY     - 1978     GOOD             NGS
 HV8016  HISTORY     - 1982     GOOD             NGS
 HV8016  HISTORY     - 19920615 GOOD             NGS
 HV8016
 HV8016                          STATION DESCRIPTION
 HV8016
 HV8016'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8016'IN WASHINGTON DC.
 HV8016'AT THE WHITE HOUSE, LOCATED IN THE SW HALF OF THE SOUTH WALL OF THE
 HV8016'MAIN BUILDING, 25 FEET WEST FROM THE MOST
 HV8016'WESTERLY SIDE OF THE SOUTH PORTICO, 30.5 FEET EAST FROM THE SW CORNER
 HV8016'OF SOUTH WALL.  WHITE HOUSE WALL MARK.
 HV8016
 HV8016                          STATION RECOVERY (1978)
 HV8016
 HV8016'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8016'AT THE WHITE HOUSE, LOCATED IN THE SW HALF OF THE SOUTH WALL OF THE
 HV8016'MAIN BUILDING, 25 FEET WEST FROM THE MOST
 HV8016'WESTERLY SIDE OF THE SOUTH PORTICO, 30.5 FEET EAST FROM THE SW CORNER
 HV8016'OF SOUTH WALL.  WHITE HOUSE WALL MARK.
 HV8016
 HV8016                          STATION RECOVERY (1982)
 HV8016
 HV8016'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8016'RECOVERED IN GOOD CONDITION.
 HV8016
 HV8016                          STATION RECOVERY (1992)
 HV8016
 HV8016'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8016'IN WASHINGTON, D.C., AT THE WHITE HOUSE, LOCATED IN THE SW HALF OF THE
 HV8016'SOUTH WALL OF THE MAIN BUILDING, 25 FEET (7.6 M) WEST FROM THE MOST
 HV8016'WESTERLY SIDE OF THE SOUTH PORTICO, 30.5 FEET (9.3 M) EAST FROM THE
 HV8016'SW CORNER OF SOUTH WALL.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7994 ***********************************************************************
 HV7994  DESIGNATION -  S 8
 HV7994  PID         -  HV7994
 HV7994  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7994  COUNTRY     -  US
 HV7994  USGS QUAD   -  WASHINGTON WEST (2016)
 HV7994
 HV7994                         *CURRENT SURVEY CONTROL
 HV7994  ______________________________________________________________________
 HV7994* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV7994* NAVD 88 ORTHO HEIGHT -    16.946 (meters)       55.60  (feet) ADJUSTED
 HV7994  ______________________________________________________________________
 HV7994  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV7994  DYNAMIC HEIGHT  -         16.937 (meters)       55.57  (feet) COMP
 HV7994  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV7994
 HV7994  VERT ORDER      -  FIRST     CLASS 0
 HV7994
 HV7994.The horizontal coordinates were scaled from a map and have
 HV7994.an estimated accuracy of +/- 6 seconds.
 HV7994
 HV7994.The orthometric height was determined by differential leveling and
 HV7994.adjusted by the NATIONAL GEODETIC SURVEY
 HV7994.in June 1991.
 HV7994
 HV7994.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7994.GEOID18 height accuracy estimate available here.
 HV7994
 HV7994.Click photographs - Photos may exist for this station.
 HV7994
 HV7994.The dynamic height is computed by dividing the NAVD 88
 HV7994.geopotential number by the normal gravity value computed on the
 HV7994.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV7994.degrees latitude (g = 980.6199 gals.).
 HV7994
 HV7994.The modeled gravity was interpolated from observed gravity values.
 HV7994
 HV7994
 HV7994_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV7994
 HV7994                          SUPERSEDED SURVEY CONTROL
 HV7994
 HV7994  NGVD 29 (08/12/92)   17.179  (m)           56.36   (f) ADJUSTED    1 0
 HV7994
 HV7994.Superseded values are not recommended for survey control.
 HV7994
 HV7994.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7994.See file dsdata.pdf to determine how the superseded data were derived.
 HV7994
 HV7994_MARKER: Z = SEE DESCRIPTION
 HV7994_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV7994_SP_SET: BUILDING
 HV7994_MARK LOGO: NONE
 HV7994_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV7994_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV7994
 HV7994  HISTORY     - Date     Condition        Report By
 HV7994  HISTORY     - 1949     MONUMENTED       CGS
 HV7994  HISTORY     - 1978     GOOD             NGS
 HV7994  HISTORY     - 1978     GOOD             NGS
 HV7994  HISTORY     - 1982     GOOD             NGS
 HV7994  HISTORY     - 19920615 GOOD             NGS
 HV7994
 HV7994                          STATION DESCRIPTION
 HV7994
 HV7994'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV7994'IN WASHINGTON DC.
 HV7994'AT THE WHITE HOUSE, 3.8 FEET EAST OF THE SOUTHWEST CORNER OF THE
 HV7994'WHITE HOUSE, AND 3.1 FEET ABOVE THE SIDEWALK.  WHITE HOUSE WALL MARK.
 HV7994
 HV7994                          STATION RECOVERY (1978)
 HV7994
 HV7994'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV7994'AT THE WHITE HOUSE, 3.8 FEET EAST OF THE SOUTHWEST CORNER OF THE
 HV7994'WHITE HOUSE, AND 3.1 FEET ABOVE THE SIDEWALK.  WHITE HOUSE WALL MARK.
 HV7994
 HV7994                          STATION RECOVERY (1982)
 HV7994
 HV7994'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV7994'RECOVERED IN GOOD CONDITION.
 HV7994
 HV7994                          STATION RECOVERY (1992)
 HV7994
 HV7994'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV7994'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 3.8 FEET (1.2 M) EAST OF THE
 HV7994'SOUTHWEST CORNER OF THE WHITE HOUSE, AND 3.1 FEET (0.9 M) ABOVE THE
 HV7994'SIDEWALK.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7995 ***********************************************************************
 HV7995  DESIGNATION -  S 9
 HV7995  PID         -  HV7995
 HV7995  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7995  COUNTRY     -  US
 HV7995  USGS QUAD   -  WASHINGTON WEST (2016)
 HV7995
 HV7995                         *CURRENT SURVEY CONTROL
 HV7995  ______________________________________________________________________
 HV7995* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV7995* NAVD 88 ORTHO HEIGHT -    17.321 (meters)       56.83  (feet) ADJUSTED
 HV7995  ______________________________________________________________________
 HV7995  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV7995  DYNAMIC HEIGHT  -         17.312 (meters)       56.80  (feet) COMP
 HV7995  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV7995
 HV7995  VERT ORDER      -  FIRST     CLASS 0
 HV7995
 HV7995.The horizontal coordinates were scaled from a map and have
 HV7995.an estimated accuracy of +/- 6 seconds.
 HV7995
 HV7995.The orthometric height was determined by differential leveling and
 HV7995.adjusted by the NATIONAL GEODETIC SURVEY
 HV7995.in June 1991.
 HV7995
 HV7995.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7995.GEOID18 height accuracy estimate available here.
 HV7995
 HV7995.Click photographs - Photos may exist for this station.
 HV7995
 HV7995.The dynamic height is computed by dividing the NAVD 88
 HV7995.geopotential number by the normal gravity value computed on the
 HV7995.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV7995.degrees latitude (g = 980.6199 gals.).
 HV7995
 HV7995.The modeled gravity was interpolated from observed gravity values.
 HV7995
 HV7995
 HV7995_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV7995
 HV7995                          SUPERSEDED SURVEY CONTROL
 HV7995
 HV7995  NGVD 29 (08/12/92)   17.554  (m)           57.59   (f) ADJUSTED    1 0
 HV7995
 HV7995.Superseded values are not recommended for survey control.
 HV7995
 HV7995.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7995.See file dsdata.pdf to determine how the superseded data were derived.
 HV7995
 HV7995_MARKER: Z = SEE DESCRIPTION
 HV7995_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV7995_SP_SET: BUILDING
 HV7995_MARK LOGO: NONE
 HV7995_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV7995_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV7995
 HV7995  HISTORY     - Date     Condition        Report By
 HV7995  HISTORY     - 1949     MONUMENTED       CGS
 HV7995  HISTORY     - 1978     GOOD             NGS
 HV7995  HISTORY     - 1978     GOOD             NGS
 HV7995  HISTORY     - 1982     GOOD             NGS
 HV7995  HISTORY     - 19920615 GOOD             NGS
 HV7995
 HV7995                          STATION DESCRIPTION
 HV7995
 HV7995'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV7995'IN WASHINGTON DC.
 HV7995'AT WHITE HOUSE, 3.3 FEET NORTH OF THE SOUTHWEST CORNER OF THE
 HV7995'WHITE HOUSE, 7.1 FEET AROUND THE CORNER FROM S 8, 18.5 FEET SOUTHEAST
 HV7995'OF THE CENTER OF THE SOUTH ENTRANCE TO THE CHINESE ROOM, WHITE HOUSE
 HV7995'WALL MARK.
 HV7995
 HV7995                          STATION RECOVERY (1978)
 HV7995
 HV7995'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV7995'AT WHITE HOUSE, 3.3 FEET NORTH OF THE SOUTHWEST CORNER OF THE
 HV7995'WHITE HOUSE, 7.1 FEET AROUND THE CORNER FROM S 8, 18.5 FEET SOUTHEAST
 HV7995'OF THE CENTER OF THE SOUTH ENTRANCE TO THE CHINESE ROOM, WHITE HOUSE
 HV7995'WALL MARK.
 HV7995
 HV7995                          STATION RECOVERY (1982)
 HV7995
 HV7995'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV7995'RECOVERED IN GOOD CONDITION.
 HV7995
 HV7995                          STATION RECOVERY (1992)
 HV7995
 HV7995'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV7995'IN WASHINGTON, D.C., 3.3 FEET (1.0 M) NORTH OF THE SOUTHWEST CORNER OF
 HV7995'THE WHITE HOUSE, 7.1 FEET (2.2 M) AROUND THE CORNER FROM S 8, 18.5
 HV7995'FEET (5.6 M) SOUTHEAST OF THE CENTER OF THE SOUTH ENTRANCE TO THE
 HV7995'CHINESE ROOM, WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7702 ***********************************************************************
 HV7702  DESIGNATION -  S E 143 D 1960
 HV7702  PID         -  HV7702
 HV7702  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7702  COUNTRY     -  US
 HV7702  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7702
 HV7702                         *CURRENT SURVEY CONTROL
 HV7702  ______________________________________________________________________
 HV7702* NAD 83(1993) POSITION- 38 52 57.06014(N) 076 59 29.09035(W)   ADJUSTED
 HV7702* NAVD 88 ORTHO HEIGHT -    23.    (meters)       75.    (feet) SCALED
 HV7702  ______________________________________________________________________
 HV7702  GEOID HEIGHT    -        -32.173 (meters)                     GEOID18
 HV7702  LAPLACE CORR    -         -3.53  (seconds)                    DEFLEC18
 HV7702  HORZ ORDER      -  SECOND
 HV7702
 HV7702.The horizontal coordinates were established by classical geodetic methods
 HV7702.and adjusted by the National Geodetic Survey in November 1994.
 HV7702
 HV7702.The orthometric height was scaled from a topographic map.
 HV7702
 HV7702.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7702.GEOID18 height accuracy estimate available here.
 HV7702
 HV7702.Click photographs - Photos may exist for this station.
 HV7702
 HV7702.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7702
 HV7702. The following values were computed from the NAD 83(1993) position.
 HV7702
 HV7702;                    North         East     Units Scale Factor Converg.
 HV7702;SPC MD       -   134,964.554   400,744.967   MT  0.99994985   +0 00 19.4
 HV7702;SPC MD       -   442,796.21  1,314,777.45   sFT  0.99994985   +0 00 19.4
 HV7702;SPC VA N     - 2,136,034.813 3,630,887.967   MT  0.99995905   +0 56 29.5
 HV7702;SPC VA N     - 7,007,974.22 11,912,338.27   sFT  0.99995905   +0 56 29.5
 HV7702;UTM  18      - 4,305,624.200   327,267.719   MT  0.99996741   -1 15 01.3
 HV7702
 HV7702!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7702!SPC MD       -   1.00000148  x   0.99994985  =   0.99995133
 HV7702!SPC VA N     -   1.00000148  x   0.99995905  =   0.99996053
 HV7702!UTM  18      -   1.00000148  x   0.99996741  =   0.99996889
 HV7702
 HV7702:                Primary Azimuth Mark                     Grid Az
 HV7702:SPC MD       -  SE 153 RESET                             180 01 29.7
 HV7702:SPC VA N     -  SE 153 RESET                             179 05 19.6
 HV7702:UTM  18      -  SE 153 RESET                             181 16 50.4
 HV7702
 HV7702_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2726705624(NAD 83)
 HV7702
 HV7702|---------------------------------------------------------------------|
 HV7702| PID    Reference Object                     Distance      Geod. Az  |
 HV7702|                                                           dddmmss.s |
 HV7702| HV1475 SE 153 RESET                        449.911 METERS 1800149.1 |
 HV7702|---------------------------------------------------------------------|
 HV7702
 HV7702                          SUPERSEDED SURVEY CONTROL
 HV7702
 HV7702  NAD 83(1991)-  38 52 57.05886(N)    076 59 29.09150(W) AD(       ) 2
 HV7702  NAD 83(1986)-  38 52 57.05815(N)    076 59 29.10233(W) AD(       ) 2
 HV7702  NAD 27      -  38 52 56.65700(N)    076 59 30.18660(W) AD(       ) 2
 HV7702
 HV7702.Superseded values are not recommended for survey control.
 HV7702
 HV7702.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7702.See file dsdata.pdf to determine how the superseded data were derived.
 HV7702
 HV7702_MARKER: DS = TRIANGULATION STATION DISK
 HV7702_SETTING: 0 = UNSPECIFIED SETTING
 HV7702_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7702
 HV7702  HISTORY     - Date     Condition        Report By
 HV7702  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7702  HISTORY     - 1971     GOOD             NGS
 HV7702
 HV7702                          STATION DESCRIPTION
 HV7702
 HV7702'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7702'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV7702'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO S.E. 143-D
 HV7702'GROUTED IN CONCRETE WALK.
 HV7702
 HV7702                          STATION RECOVERY (1971)
 HV7702
 HV7702'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7702'THE STATION AND REFERENCE POINTS WERE RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7648 ***********************************************************************
 HV7648  DESIGNATION -  S E 148 D 1960
 HV7648  PID         -  HV7648
 HV7648  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7648  COUNTRY     -  US
 HV7648  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7648
 HV7648                         *CURRENT SURVEY CONTROL
 HV7648  ______________________________________________________________________
 HV7648* NAD 83(1993) POSITION- 38 53 22.72695(N) 076 55 22.69491(W)   ADJUSTED
 HV7648* NAVD 88 ORTHO HEIGHT -    32.    (meters)      105.    (feet) SCALED
 HV7648  ______________________________________________________________________
 HV7648  GEOID HEIGHT    -        -32.301 (meters)                     GEOID18
 HV7648  LAPLACE CORR    -         -4.67  (seconds)                    DEFLEC18
 HV7648  HORZ ORDER      -  SECOND
 HV7648
 HV7648.The horizontal coordinates were established by classical geodetic methods
 HV7648.and adjusted by the National Geodetic Survey in November 1994.
 HV7648
 HV7648.The orthometric height was scaled from a topographic map.
 HV7648
 HV7648.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7648.GEOID18 height accuracy estimate available here.
 HV7648
 HV7648.Click photographs - Photos may exist for this station.
 HV7648
 HV7648.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7648
 HV7648. The following values were computed from the NAD 83(1993) position.
 HV7648
 HV7648;                    North         East     Units Scale Factor Converg.
 HV7648;SPC MD       -   135,758.787   406,682.779   MT  0.99994988   +0 02 54.0
 HV7648;SPC MD       -   445,401.95  1,334,258.42   sFT  0.99994988   +0 02 54.0
 HV7648;SPC VA N     - 2,136,925.948 3,636,812.068   MT  0.99995964   +0 59 03.3
 HV7648;SPC VA N     - 7,010,897.88 11,931,774.26   sFT  0.99995964   +0 59 03.3
 HV7648;UTM  18      - 4,306,288.108   333,221.542   MT  0.99994252   -1 12 27.2
 HV7648
 HV7648!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7648!SPC MD       -   1.00000009  x   0.99994988  =   0.99994997
 HV7648!SPC VA N     -   1.00000009  x   0.99995964  =   0.99995973
 HV7648!UTM  18      -   1.00000009  x   0.99994252  =   0.99994261
 HV7648
 HV7648_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3322106288(NAD 83)
 HV7648
 HV7648|---------------------------------------------------------------------|
 HV7648| PID    Reference Object                     Distance      Geod. Az  |
 HV7648|                                                           dddmmss.s |
 HV7648| HV7649 N E 148 C 1960                      284.407 METERS 00730     |
 HV7648| HV1477 SE 157                              375.883 METERS 16810     |
 HV7648|---------------------------------------------------------------------|
 HV7648
 HV7648                          SUPERSEDED SURVEY CONTROL
 HV7648
 HV7648  NAD 83(1991)-  38 53 22.72562(N)    076 55 22.69600(W) AD(       ) 2
 HV7648  NAD 83(1986)-  38 53 22.72449(N)    076 55 22.70668(W) AD(       ) 2
 HV7648  NAD 27      -  38 53 22.32340(N)    076 55 23.80010(W) AD(       ) 2
 HV7648
 HV7648.Superseded values are not recommended for survey control.
 HV7648
 HV7648.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7648.See file dsdata.pdf to determine how the superseded data were derived.
 HV7648
 HV7648_MARKER: Z = SEE DESCRIPTION
 HV7648_SETTING: 0 = UNSPECIFIED SETTING
 HV7648_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7648
 HV7648  HISTORY     - Date     Condition        Report By
 HV7648  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7648  HISTORY     - 1971     GOOD             NGS
 HV7648
 HV7648                          STATION DESCRIPTION
 HV7648
 HV7648'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7648'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7648
 HV7648                          STATION RECOVERY (1971)
 HV7648
 HV7648'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7648'THE STATION AND ALL REFERENCE POINTS WERE RECOVERED AND FOUND
 HV7648'TO BE IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4360 ***********************************************************************
 HV4360  DESIGNATION -  S E 152 A 1960
 HV4360  PID         -  HV4360
 HV4360  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4360  COUNTRY     -  US
 HV4360  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4360
 HV4360                         *CURRENT SURVEY CONTROL
 HV4360  ______________________________________________________________________
 HV4360* NAD 83(1993) POSITION- 38 52 42.52680(N) 077 00 24.01528(W)   ADJUSTED
 HV4360* NAVD 88 ORTHO HEIGHT -     9.    (meters)       30.    (feet) SCALED
 HV4360  ______________________________________________________________________
 HV4360  GEOID HEIGHT    -        -32.154 (meters)                     GEOID18
 HV4360  LAPLACE CORR    -         -3.18  (seconds)                    DEFLEC18
 HV4360  HORZ ORDER      -  SECOND
 HV4360
 HV4360.The horizontal coordinates were established by classical geodetic methods
 HV4360.and adjusted by the National Geodetic Survey in November 1994.
 HV4360
 HV4360.The orthometric height was scaled from a topographic map.
 HV4360
 HV4360.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4360.GEOID18 height accuracy estimate available here.
 HV4360
 HV4360.Click photographs - Photos may exist for this station.
 HV4360
 HV4360.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4360
 HV4360. The following values were computed from the NAD 83(1993) position.
 HV4360
 HV4360;                    North         East     Units Scale Factor Converg.
 HV4360;SPC MD       -   134,516.398   399,421.165   MT  0.99994985   -0 00 15.1
 HV4360;SPC MD       -   441,325.88  1,310,434.27   sFT  0.99994985   -0 00 15.1
 HV4360;SPC VA N     - 2,135,565.083 3,629,571.652   MT  0.99995873   +0 55 55.2
 HV4360;SPC VA N     - 7,006,433.11 11,908,019.66   sFT  0.99995873   +0 55 55.2
 HV4360;UTM  18      - 4,305,205.153   325,934.387   MT  0.99997311   -1 15 35.4
 HV4360
 HV4360!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4360!SPC MD       -   1.00000367  x   0.99994985  =   0.99995352
 HV4360!SPC VA N     -   1.00000367  x   0.99995873  =   0.99996240
 HV4360!UTM  18      -   1.00000367  x   0.99997311  =   0.99997678
 HV4360
 HV4360:                Primary Azimuth Mark                     Grid Az
 HV4360:SPC MD       -  SW 152                                   269 50 10.4
 HV4360:SPC VA N     -  SW 152                                   268 54 00.1
 HV4360:UTM  18      -  SW 152                                   271 05 30.7
 HV4360
 HV4360_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2593405205(NAD 83)
 HV4360
 HV4360|---------------------------------------------------------------------|
 HV4360| PID    Reference Object                     Distance      Geod. Az  |
 HV4360|                                                           dddmmss.s |
 HV4360| HV4357 S E 152 B 1960                      330.797 METERS 09019     |
 HV4360| HV2190 SW 152                              486.022 METERS 2694955.3 |
 HV4360|---------------------------------------------------------------------|
 HV4360
 HV4360                          SUPERSEDED SURVEY CONTROL
 HV4360
 HV4360  NAD 83(1991)-  38 52 42.52547(N)    077 00 24.01644(W) AD(       ) 2
 HV4360  NAD 83(1986)-  38 52 42.52493(N)    077 00 24.02715(W) AD(       ) 2
 HV4360  NAD 27      -  38 52 42.12320(N)    077 00 25.10980(W) AD(       ) 2
 HV4360
 HV4360.Superseded values are not recommended for survey control.
 HV4360
 HV4360.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4360.See file dsdata.pdf to determine how the superseded data were derived.
 HV4360
 HV4360_MARKER: Z = SEE DESCRIPTION
 HV4360_SETTING: 0 = UNSPECIFIED SETTING
 HV4360_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4360
 HV4360  HISTORY     - Date     Condition        Report By
 HV4360  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4360  HISTORY     - 1971     GOOD             NGS
 HV4360
 HV4360                          STATION DESCRIPTION
 HV4360
 HV4360'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4360'STATION AND THE TWO REFERENCE POINTS ON RIMS OF MANHOLES WERE
 HV4360'RECOVERED IN GOOD CONDITION.  THE SYCAMORE TREE REFERENCED TO IS
 HV4360'GONE.  ADDITIONAL NOTES ARE.  STATION IS AT EAST EDGE OF CURBING
 HV4360'ALONG THE EAST SIDE OF AN ALLEY BETWEEN FIRST ST. TO THE EAST AND
 HV4360'HALF ST. TO THE WEST AND NORTH OF K ST.  IT IS 14.4 FEET SOUTH
 HV4360'OF THE SOUTHWEST CORNER OF A CONCRETE BLOCK BUILDING AND 10.2
 HV4360'FEET NORTH OF THE FACE OF CURB ALONG THE NORTH SIDE OF K ST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4357 ***********************************************************************
 HV4357  DESIGNATION -  S E 152 B 1960
 HV4357  PID         -  HV4357
 HV4357  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4357  COUNTRY     -  US
 HV4357  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4357
 HV4357                         *CURRENT SURVEY CONTROL
 HV4357  ______________________________________________________________________
 HV4357* NAD 83(1993) POSITION- 38 52 42.46800(N) 077 00 10.29175(W)   ADJUSTED
 HV4357* NAVD 88 ORTHO HEIGHT -     9.    (meters)       30.    (feet) SCALED
 HV4357  ______________________________________________________________________
 HV4357  GEOID HEIGHT    -        -32.161 (meters)                     GEOID18
 HV4357  LAPLACE CORR    -         -3.22  (seconds)                    DEFLEC18
 HV4357  HORZ ORDER      -  SECOND
 HV4357
 HV4357.The horizontal coordinates were established by classical geodetic methods
 HV4357.and adjusted by the National Geodetic Survey in November 1994.
 HV4357
 HV4357.The orthometric height was scaled from a topographic map.
 HV4357
 HV4357.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4357.GEOID18 height accuracy estimate available here.
 HV4357
 HV4357.Click photographs - Photos may exist for this station.
 HV4357
 HV4357.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4357
 HV4357. The following values were computed from the NAD 83(1993) position.
 HV4357
 HV4357;                    North         East     Units Scale Factor Converg.
 HV4357;SPC MD       -   134,514.567   399,751.940   MT  0.99994985   -0 00 06.5
 HV4357;SPC MD       -   441,319.88  1,311,519.49   sFT  0.99994985   -0 00 06.5
 HV4357;SPC VA N     - 2,135,568.658 3,629,902.416   MT  0.99995873   +0 56 03.8
 HV4357;SPC VA N     - 7,006,444.84 11,909,104.84   sFT  0.99995873   +0 56 03.8
 HV4357;UTM  18      - 4,305,196.075   326,265.050   MT  0.99997169   -1 15 26.8
 HV4357
 HV4357!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4357!SPC MD       -   1.00000367  x   0.99994985  =   0.99995352
 HV4357!SPC VA N     -   1.00000367  x   0.99995873  =   0.99996240
 HV4357!UTM  18      -   1.00000367  x   0.99997169  =   0.99997536
 HV4357
 HV4357_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2626505196(NAD 83)
 HV4357
 HV4357|---------------------------------------------------------------------|
 HV4357| PID    Reference Object                     Distance      Geod. Az  |
 HV4357|                                                           dddmmss.s |
 HV4357| HV7695 S E 152 C 1960                      381.681 METERS 08945     |
 HV4357| HV4360 S E 152 A 1960                      330.797 METERS 27019     |
 HV4357|---------------------------------------------------------------------|
 HV4357
 HV4357                          SUPERSEDED SURVEY CONTROL
 HV4357
 HV4357  NAD 83(1991)-  38 52 42.46667(N)    077 00 10.29291(W) AD(       ) 2
 HV4357  NAD 83(1986)-  38 52 42.46609(N)    077 00 10.30366(W) AD(       ) 2
 HV4357  NAD 27      -  38 52 42.06440(N)    077 00 11.38680(W) AD(       ) 2
 HV4357
 HV4357.Superseded values are not recommended for survey control.
 HV4357
 HV4357.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4357.See file dsdata.pdf to determine how the superseded data were derived.
 HV4357
 HV4357_MARKER: Z = SEE DESCRIPTION
 HV4357_SETTING: 0 = UNSPECIFIED SETTING
 HV4357_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4357
 HV4357  HISTORY     - Date     Condition        Report By
 HV4357  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4357  HISTORY     - 1971     GOOD             NGS
 HV4357
 HV4357                          STATION DESCRIPTION
 HV4357
 HV4357'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4357'STATION AND REFERENCE POINTS ALL RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7695 ***********************************************************************
 HV7695  DESIGNATION -  S E 152 C 1960
 HV7695  PID         -  HV7695
 HV7695  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7695  COUNTRY     -  US
 HV7695  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7695
 HV7695                         *CURRENT SURVEY CONTROL
 HV7695  ______________________________________________________________________
 HV7695* NAD 83(1993) POSITION- 38 52 42.52160(N) 076 59 54.45716(W)   ADJUSTED
 HV7695* NAVD 88 ORTHO HEIGHT -    12.    (meters)       39.    (feet) SCALED
 HV7695  ______________________________________________________________________
 HV7695  GEOID HEIGHT    -        -32.168 (meters)                     GEOID18
 HV7695  LAPLACE CORR    -         -3.27  (seconds)                    DEFLEC18
 HV7695  HORZ ORDER      -  SECOND
 HV7695
 HV7695.The horizontal coordinates were established by classical geodetic methods
 HV7695.and adjusted by the National Geodetic Survey in November 1994.
 HV7695
 HV7695.The orthometric height was scaled from a topographic map.
 HV7695
 HV7695.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7695.GEOID18 height accuracy estimate available here.
 HV7695
 HV7695.Click photographs - Photos may exist for this station.
 HV7695
 HV7695.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7695
 HV7695. The following values were computed from the NAD 83(1993) position.
 HV7695
 HV7695;                    North         East     Units Scale Factor Converg.
 HV7695;SPC MD       -   134,516.217   400,133.598   MT  0.99994985   +0 00 03.5
 HV7695;SPC MD       -   441,325.29  1,312,771.65   sFT  0.99994985   +0 00 03.5
 HV7695;SPC VA N     - 2,135,576.543 3,630,283.999   MT  0.99995873   +0 56 13.7
 HV7695;SPC VA N     - 7,006,470.71 11,910,356.75   sFT  0.99995873   +0 56 13.7
 HV7695;UTM  18      - 4,305,189.361   326,646.661   MT  0.99997006   -1 15 16.9
 HV7695
 HV7695!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7695!SPC MD       -   1.00000320  x   0.99994985  =   0.99995305
 HV7695!SPC VA N     -   1.00000320  x   0.99995873  =   0.99996193
 HV7695!UTM  18      -   1.00000320  x   0.99997006  =   0.99997326
 HV7695
 HV7695_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2664605189(NAD 83)
 HV7695
 HV7695|---------------------------------------------------------------------|
 HV7695| PID    Reference Object                     Distance      Geod. Az  |
 HV7695|                                                           dddmmss.s |
 HV7695| HV7694 S E 152 D 1960                      287.917 METERS 09025     |
 HV7695| HV4357 S E 152 B 1960                      381.681 METERS 26945     |
 HV7695|---------------------------------------------------------------------|
 HV7695
 HV7695                          SUPERSEDED SURVEY CONTROL
 HV7695
 HV7695  NAD 83(1991)-  38 52 42.52027(N)    076 59 54.45833(W) AD(       ) 2
 HV7695  NAD 83(1986)-  38 52 42.51965(N)    076 59 54.46912(W) AD(       ) 2
 HV7695  NAD 27      -  38 52 42.11790(N)    076 59 55.55280(W) AD(       ) 2
 HV7695
 HV7695.Superseded values are not recommended for survey control.
 HV7695
 HV7695.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7695.See file dsdata.pdf to determine how the superseded data were derived.
 HV7695
 HV7695_MARKER: Z = SEE DESCRIPTION
 HV7695_SETTING: 0 = UNSPECIFIED SETTING
 HV7695_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7695
 HV7695  HISTORY     - Date     Condition        Report By
 HV7695  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7695  HISTORY     - 1971     GOOD             NGS
 HV7695
 HV7695                          STATION DESCRIPTION
 HV7695
 HV7695'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7695'THE STATION MARK IS AN IRON PIPE WITH A BRASS SCREW IN THE CENTER,
 HV7695'SET IN THE SIDEWALK.
 HV7695
 HV7695                          STATION RECOVERY (1971)
 HV7695
 HV7695'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7695'THIS STATION AND REFERENCE POINTS WERE ALL RECOVERED AND FOUND IN
 HV7695'GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7701 ***********************************************************************
 HV7701  DESIGNATION -  S E 153 A 1960
 HV7701  PID         -  HV7701
 HV7701  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7701  COUNTRY     -  US
 HV7701  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7701
 HV7701                         *CURRENT SURVEY CONTROL
 HV7701  ______________________________________________________________________
 HV7701* NAD 83(1993) POSITION- 38 52 42.45559(N) 076 59 20.77384(W)   ADJUSTED
 HV7701* NAVD 88 ORTHO HEIGHT -    17.    (meters)       56.    (feet) SCALED
 HV7701  ______________________________________________________________________
 HV7701  GEOID HEIGHT    -        -32.184 (meters)                     GEOID18
 HV7701  LAPLACE CORR    -         -3.41  (seconds)                    DEFLEC18
 HV7701  HORZ ORDER      -  SECOND
 HV7701
 HV7701.The horizontal coordinates were established by classical geodetic methods
 HV7701.and adjusted by the National Geodetic Survey in November 1994.
 HV7701
 HV7701.The orthometric height was scaled from a topographic map.
 HV7701
 HV7701.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7701.GEOID18 height accuracy estimate available here.
 HV7701
 HV7701.Click photographs - Photos may exist for this station.
 HV7701
 HV7701.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7701
 HV7701. The following values were computed from the NAD 83(1993) position.
 HV7701
 HV7701;                    North         East     Units Scale Factor Converg.
 HV7701;SPC MD       -   134,514.237   400,945.460   MT  0.99994985   +0 00 24.6
 HV7701;SPC MD       -   441,318.79  1,315,435.23   sFT  0.99994985   +0 00 24.6
 HV7701;SPC VA N     - 2,135,587.828 3,631,095.793   MT  0.99995873   +0 56 34.7
 HV7701;SPC VA N     - 7,006,507.73 11,913,020.11   sFT  0.99995873   +0 56 34.7
 HV7701;UTM  18      - 4,305,169.590   327,458.299   MT  0.99996660   -1 14 55.7
 HV7701
 HV7701!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7701!SPC MD       -   1.00000242  x   0.99994985  =   0.99995227
 HV7701!SPC VA N     -   1.00000242  x   0.99995873  =   0.99996115
 HV7701!UTM  18      -   1.00000242  x   0.99996660  =   0.99996902
 HV7701
 HV7701_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2745805169(NAD 83)
 HV7701
 HV7701                          SUPERSEDED SURVEY CONTROL
 HV7701
 HV7701  NAD 83(1991)-  38 52 42.45427(N)    076 59 20.77499(W) AD(       ) 2
 HV7701  NAD 83(1986)-  38 52 42.45358(N)    076 59 20.78584(W) AD(       ) 2
 HV7701  NAD 27      -  38 52 42.05160(N)    076 59 21.87080(W) AD(       ) 2
 HV7701
 HV7701.Superseded values are not recommended for survey control.
 HV7701
 HV7701.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7701.See file dsdata.pdf to determine how the superseded data were derived.
 HV7701
 HV7701_MARKER: Z = SEE DESCRIPTION
 HV7701_SETTING: 0 = UNSPECIFIED SETTING
 HV7701_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7701
 HV7701  HISTORY     - Date     Condition        Report By
 HV7701  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7701  HISTORY     - 1971     GOOD             NGS
 HV7701
 HV7701                          STATION DESCRIPTION
 HV7701
 HV7701'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7701'THE STATION IS A TACK SET IN A PIPE IN THE SIDEWALK.
 HV7701
 HV7701                          STATION RECOVERY (1971)
 HV7701
 HV7701'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7701'THE STATION WAS RECOVERED IN GOOD CONDITION.  ALL REFERENCE POINTS
 HV7701'WERE RECOVERED AND FOUND TO BE CORRECT.  THIS STATION IS 5.05
 HV7701'FEET SOUTH-SOUTHEAST OF THE AZ. MK. FOR STATION SE 153 RESET
 HV7701'WHICH IS A CONCRETE MONUMENT WITH A DISK AND UNDER A MANHOLE
 HV7701'COVER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7681 ***********************************************************************
 HV7681  DESIGNATION -  S E 153 B 1960
 HV7681  PID         -  HV7681
 HV7681  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7681  COUNTRY     -  US
 HV7681  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7681
 HV7681                         *CURRENT SURVEY CONTROL
 HV7681  ______________________________________________________________________
 HV7681* NAD 83(1993) POSITION- 38 52 42.44955(N) 076 59 08.36610(W)   ADJUSTED
 HV7681* NAVD 88 ORTHO HEIGHT -    16.    (meters)       52.    (feet) SCALED
 HV7681  ______________________________________________________________________
 HV7681  GEOID HEIGHT    -        -32.190 (meters)                     GEOID18
 HV7681  LAPLACE CORR    -         -3.44  (seconds)                    DEFLEC18
 HV7681  HORZ ORDER      -  SECOND
 HV7681
 HV7681.The horizontal coordinates were established by classical geodetic methods
 HV7681.and adjusted by the National Geodetic Survey in November 1994.
 HV7681
 HV7681.The orthometric height was scaled from a topographic map.
 HV7681
 HV7681.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7681.GEOID18 height accuracy estimate available here.
 HV7681
 HV7681.Click photographs - Photos may exist for this station.
 HV7681
 HV7681.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7681
 HV7681. The following values were computed from the NAD 83(1993) position.
 HV7681
 HV7681;                    North         East     Units Scale Factor Converg.
 HV7681;SPC MD       -   134,514.092   401,244.521   MT  0.99994985   +0 00 32.4
 HV7681;SPC MD       -   441,318.32  1,316,416.40   sFT  0.99994985   +0 00 32.4
 HV7681;SPC VA N     - 2,135,592.569 3,631,394.819   MT  0.99995873   +0 56 42.5
 HV7681;SPC VA N     - 7,006,523.29 11,914,001.17   sFT  0.99995873   +0 56 42.5
 HV7681;UTM  18      - 4,305,162.891   327,757.290   MT  0.99996533   -1 14 47.9
 HV7681
 HV7681!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7681!SPC MD       -   1.00000258  x   0.99994985  =   0.99995243
 HV7681!SPC VA N     -   1.00000258  x   0.99995873  =   0.99996131
 HV7681!UTM  18      -   1.00000258  x   0.99996533  =   0.99996791
 HV7681
 HV7681_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2775705162(NAD 83)
 HV7681
 HV7681                          SUPERSEDED SURVEY CONTROL
 HV7681
 HV7681  NAD 83(1991)-  38 52 42.44823(N)    076 59 08.36725(W) AD(       ) 2
 HV7681  NAD 83(1986)-  38 52 42.44752(N)    076 59 08.37807(W) AD(       ) 2
 HV7681  NAD 27      -  38 52 42.04550(N)    076 59 09.46360(W) AD(       ) 2
 HV7681
 HV7681.Superseded values are not recommended for survey control.
 HV7681
 HV7681.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7681.See file dsdata.pdf to determine how the superseded data were derived.
 HV7681
 HV7681_MARKER: Z = SEE DESCRIPTION
 HV7681_SETTING: 0 = UNSPECIFIED SETTING
 HV7681_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7681
 HV7681  HISTORY     - Date     Condition        Report By
 HV7681  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7681  HISTORY     - 1971     GOOD             NGS
 HV7681
 HV7681                          STATION DESCRIPTION
 HV7681
 HV7681'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7681'THE STATION MARK IS AN IRON PIPE WITH A BRASS SCREW IN THE CENTER,
 HV7681'SET IN THE SIDEWALK.
 HV7681
 HV7681                          STATION RECOVERY (1971)
 HV7681
 HV7681'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7681'STATION IS BETWEEN CRACK IN SIDEWALK.  IT WAS RECOVERED IN GOOD
 HV7681'CONDITION.  ALL REFERENCE POINTS WERE RECOVERED AND CHECKED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7686 ***********************************************************************
 HV7686  DESIGNATION -  S E 153 C 1960
 HV7686  PID         -  HV7686
 HV7686  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7686  COUNTRY     -  US
 HV7686  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7686
 HV7686                         *CURRENT SURVEY CONTROL
 HV7686  ______________________________________________________________________
 HV7686* NAD 83(1993) POSITION- 38 52 42.01670(N) 076 58 55.38633(W)   ADJUSTED
 HV7686* NAVD 88 ORTHO HEIGHT -    14.    (meters)       46.    (feet) SCALED
 HV7686  ______________________________________________________________________
 HV7686  GEOID HEIGHT    -        -32.197 (meters)                     GEOID18
 HV7686  LAPLACE CORR    -         -3.44  (seconds)                    DEFLEC18
 HV7686  HORZ ORDER      -  SECOND
 HV7686
 HV7686.The horizontal coordinates were established by classical geodetic methods
 HV7686.and adjusted by the National Geodetic Survey in November 1994.
 HV7686
 HV7686.The orthometric height was scaled from a topographic map.
 HV7686
 HV7686.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7686.GEOID18 height accuracy estimate available here.
 HV7686
 HV7686.Click photographs - Photos may exist for this station.
 HV7686
 HV7686.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7686
 HV7686. The following values were computed from the NAD 83(1993) position.
 HV7686
 HV7686;                    North         East     Units Scale Factor Converg.
 HV7686;SPC MD       -   134,500.800   401,557.373   MT  0.99994985   +0 00 40.6
 HV7686;SPC MD       -   441,274.71  1,317,442.81   sFT  0.99994985   +0 00 40.6
 HV7686;SPC VA N     - 2,135,584.390 3,631,707.848   MT  0.99995872   +0 56 50.6
 HV7686;SPC VA N     - 7,006,496.45 11,915,028.16   sFT  0.99995872   +0 56 50.6
 HV7686;UTM  18      - 4,305,142.747   328,069.780   MT  0.99996401   -1 14 39.8
 HV7686
 HV7686!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7686!SPC MD       -   1.00000289  x   0.99994985  =   0.99995274
 HV7686!SPC VA N     -   1.00000289  x   0.99995872  =   0.99996161
 HV7686!UTM  18      -   1.00000289  x   0.99996401  =   0.99996690
 HV7686
 HV7686_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2806905142(NAD 83)
 HV7686
 HV7686                          SUPERSEDED SURVEY CONTROL
 HV7686
 HV7686  NAD 83(1991)-  38 52 42.01538(N)    076 58 55.38747(W) AD(       ) 2
 HV7686  NAD 83(1986)-  38 52 42.01465(N)    076 58 55.39827(W) AD(       ) 2
 HV7686  NAD 27      -  38 52 41.61250(N)    076 58 56.48440(W) AD(       ) 2
 HV7686
 HV7686.Superseded values are not recommended for survey control.
 HV7686
 HV7686.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7686.See file dsdata.pdf to determine how the superseded data were derived.
 HV7686
 HV7686_MARKER: Z = SEE DESCRIPTION
 HV7686_SETTING: 0 = UNSPECIFIED SETTING
 HV7686_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7686
 HV7686  HISTORY     - Date     Condition        Report By
 HV7686  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7686  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7686
 HV7686                          STATION DESCRIPTION
 HV7686
 HV7686'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7686'THE STATION MARK IS AN IRON PIPE WITH A BRASS SCREW IN THE CENTER,
 HV7686'SET IN THE SIDEWALK.
 HV7686
 HV7686                          STATION RECOVERY (1971)
 HV7686
 HV7686'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7686'THIS STATION HAS BEEN DESTROYED.  THE AREA IS PRESENTLY UNDER
 HV7686'NEW CONSTRUCTION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7575 ***********************************************************************
 HV7575  DESIGNATION -  S E 154 A
 HV7575  PID         -  HV7575
 HV7575  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7575  COUNTRY     -  US
 HV7575  USGS QUAD   -  ANACOSTIA (2016)
 HV7575
 HV7575                         *CURRENT SURVEY CONTROL
 HV7575  ______________________________________________________________________
 HV7575* NAD 83(1993) POSITION- 38 52 22.86880(N) 076 59 01.77024(W)   ADJUSTED
 HV7575* NAVD 88 ORTHO HEIGHT -     5.    (meters)       16.    (feet) SCALED
 HV7575  ______________________________________________________________________
 HV7575  GEOID HEIGHT    -        -32.202 (meters)                     GEOID18
 HV7575  LAPLACE CORR    -         -3.19  (seconds)                    DEFLEC18
 HV7575  HORZ ORDER      -  SECOND
 HV7575
 HV7575.The horizontal coordinates were established by classical geodetic methods
 HV7575.and adjusted by the National Geodetic Survey in November 1994.
 HV7575
 HV7575.The orthometric height was scaled from a topographic map.
 HV7575
 HV7575.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7575.GEOID18 height accuracy estimate available here.
 HV7575
 HV7575.Click photographs - Photos may exist for this station.
 HV7575
 HV7575.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7575
 HV7575. The following values were computed from the NAD 83(1993) position.
 HV7575
 HV7575;                    North         East     Units Scale Factor Converg.
 HV7575;SPC MD       -   133,910.338   401,403.607   MT  0.99994985   +0 00 36.5
 HV7575;SPC MD       -   439,337.50  1,316,938.33   sFT  0.99994985   +0 00 36.5
 HV7575;SPC VA N     - 2,134,991.489 3,631,563.749   MT  0.99995830   +0 56 46.6
 HV7575;SPC VA N     - 7,004,551.24 11,914,555.40   sFT  0.99995830   +0 56 46.6
 HV7575;UTM  18      - 4,304,555.787   327,903.111   MT  0.99996471   -1 14 43.2
 HV7575
 HV7575!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7575!SPC MD       -   1.00000431  x   0.99994985  =   0.99995416
 HV7575!SPC VA N     -   1.00000431  x   0.99995830  =   0.99996261
 HV7575!UTM  18      -   1.00000431  x   0.99996471  =   0.99996902
 HV7575
 HV7575:                Primary Azimuth Mark                     Grid Az
 HV7575:SPC MD       -  SE 159 DCDHT                             236 21 25.3
 HV7575:SPC VA N     -  SE 159 DCDHT                             235 25 15.2
 HV7575:UTM  18      -  SE 159 DCDHT                             237 36 45.0
 HV7575
 HV7575_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2790304555(NAD 83)
 HV7575
 HV7575|---------------------------------------------------------------------|
 HV7575| PID    Reference Object                     Distance      Geod. Az  |
 HV7575|                                                           dddmmss.s |
 HV7575| HV1474 SE 159 DCDHT                        APPROX. 0.6 KM 2362201.8 |
 HV7575|---------------------------------------------------------------------|
 HV7575
 HV7575                          SUPERSEDED SURVEY CONTROL
 HV7575
 HV7575  NAD 83(1991)-  38 52 22.86747(N)    076 59 01.77139(W) AD(       ) 2
 HV7575  NAD 83(1986)-  38 52 22.86674(N)    076 59 01.78222(W) AD(       ) 2
 HV7575  NAD 27      -  38 52 22.46430(N)    076 59 02.86740(W) AD(       ) 2
 HV7575
 HV7575.Superseded values are not recommended for survey control.
 HV7575
 HV7575.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7575.See file dsdata.pdf to determine how the superseded data were derived.
 HV7575
 HV7575_MARKER: Z = SEE DESCRIPTION
 HV7575_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7575
 HV7575  HISTORY     - Date     Condition        Report By
 HV7575  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7575  HISTORY     - 1963     GOOD             CGS
 HV7575  HISTORY     - 1971     GOOD             NGS
 HV7575  HISTORY     - 1972     GOOD             NGS
 HV7575
 HV7575                          STATION DESCRIPTION
 HV7575
 HV7575'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7575'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7575
 HV7575                          STATION RECOVERY (1963)
 HV7575
 HV7575'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1963 (JLA)
 HV7575'STATION RECOVERED AS DESCRIBED WITH THE FOLLOWING CORRECTIONS.
 HV7575'
 HV7575'FAIRLAWN AVENUE S. E. AS INDICATED ON THE DESCRIPTIVE SKETCH
 HV7575'SHOULD BE NOTED ANACOSTIA DRIVE.
 HV7575'
 HV7575'THE DISTANCE TO THE REFERENCE CROSS CUT IN THE LAMP POST IS 51.49
 HV7575'FEET AND THE STATION MARK IS A 1 INCH GALVANIZED PIPE DRIVEN FLUSH
 HV7575'INTO THE GROUND AT THE SOUTH WEST EDGE OF INDICATED PAVED DRIVE.
 HV7575
 HV7575                          STATION RECOVERY (1971)
 HV7575
 HV7575'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7575'STATION AND REFERENCE POINTS RECOVERED IN GOOD CONDITION.  THE
 HV7575'DISTANCE FROM STATION TO CROSS CUT IN LAMP POST BASE IS 51.55
 HV7575'FEET.  THE MINITURE GOLF COURSE REFERRED TO IN DESCRIPTION HAS
 HV7575'BEEN ABANDONED BUT THE RUINS REMAIN.  IT IS NORTHWEST OF THE ONLY
 HV7575'BUILDING BETWEEN THE RIVER AND FARMINGTON AVE. IN THIS AREA.
 HV7575'
 HV7575'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7575'IN DIST. OF COL.
 HV7575
 HV7575                          STATION RECOVERY (1972)
 HV7575
 HV7575'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1972 (RDO)
 HV7575'RECOVERED AS DESCRIBED IN 1960-1971.  THE 1960 SKETCH IS
 HV7575'CONSIDERABLY SHORTENED IN THE N-S DIRECTION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7674 ***********************************************************************
 HV7674  DESIGNATION -  S E 155 1960
 HV7674  PID         -  HV7674
 HV7674  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7674  COUNTRY     -  US
 HV7674  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7674
 HV7674                         *CURRENT SURVEY CONTROL
 HV7674  ______________________________________________________________________
 HV7674* NAD 83(1993) POSITION- 38 53 21.29200(N) 076 57 35.73193(W)   ADJUSTED
 HV7674* NAVD 88 ORTHO HEIGHT -    17.    (meters)       56.    (feet) SCALED
 HV7674  ______________________________________________________________________
 HV7674  GEOID HEIGHT    -        -32.222 (meters)                     GEOID18
 HV7674  LAPLACE CORR    -         -3.65  (seconds)                    DEFLEC18
 HV7674  HORZ ORDER      -  SECOND
 HV7674
 HV7674.The horizontal coordinates were established by classical geodetic methods
 HV7674.and adjusted by the National Geodetic Survey in November 1994.
 HV7674
 HV7674.The orthometric height was scaled from a topographic map.
 HV7674
 HV7674.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7674.GEOID18 height accuracy estimate available here.
 HV7674
 HV7674.Click photographs - Photos may exist for this station.
 HV7674
 HV7674.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7674
 HV7674. The following values were computed from the NAD 83(1993) position.
 HV7674
 HV7674;                    North         East     Units Scale Factor Converg.
 HV7674;SPC MD       -   135,712.483   403,476.738   MT  0.99994988   +0 01 30.5
 HV7674;SPC MD       -   445,250.04  1,323,739.93   sFT  0.99994988   +0 01 30.5
 HV7674;SPC VA N     - 2,136,827.279 3,633,607.180   MT  0.99995960   +0 57 40.3
 HV7674;SPC VA N     - 7,010,574.16 11,921,259.56   sFT  0.99995960   +0 57 40.3
 HV7674;UTM  18      - 4,306,312.086   330,015.259   MT  0.99995581   -1 13 50.8
 HV7674
 HV7674!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7674!SPC MD       -   1.00000243  x   0.99994988  =   0.99995231
 HV7674!SPC VA N     -   1.00000243  x   0.99995960  =   0.99996203
 HV7674!UTM  18      -   1.00000243  x   0.99995581  =   0.99995824
 HV7674
 HV7674:                Primary Azimuth Mark                     Grid Az
 HV7674:SPC MD       -  9 23                                     223 40 28.9
 HV7674:SPC VA N     -  9 23                                     222 44 19.1
 HV7674:UTM  18      -  9 23                                     224 55 50.2
 HV7674
 HV7674_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3001506312(NAD 83)
 HV7674
 HV7674|---------------------------------------------------------------------|
 HV7674| PID    Reference Object                     Distance      Geod. Az  |
 HV7674|                                                           dddmmss.s |
 HV7674| HV7705 N E 146 D 1960                      APPROX. 0.5 KM 0483210.0 |
 HV7674| HV1472 9 23                                APPROX. 2.1 KM 2234159.4 |
 HV7674|---------------------------------------------------------------------|
 HV7674
 HV7674                          SUPERSEDED SURVEY CONTROL
 HV7674
 HV7674  NAD 83(1991)-  38 53 21.29068(N)    076 57 35.73306(W) AD(       ) 2
 HV7674  NAD 83(1986)-  38 53 21.28980(N)    076 57 35.74368(W) AD(       ) 2
 HV7674  NAD 27      -  38 53 20.88930(N)    076 57 36.83180(W) AD(       ) 2
 HV7674
 HV7674.Superseded values are not recommended for survey control.
 HV7674
 HV7674.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7674.See file dsdata.pdf to determine how the superseded data were derived.
 HV7674
 HV7674_MARKER: DS = TRIANGULATION STATION DISK
 HV7674_SETTING: 0 = UNSPECIFIED SETTING
 HV7674_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7674
 HV7674  HISTORY     - Date     Condition        Report By
 HV7674  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7674
 HV7674                          STATION DESCRIPTION
 HV7674
 HV7674'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7674'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV7674'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. S.E. 155 GROUTED
 HV7674'IN CONCRETE CURB.  MARK HAS BEEN DESTROYED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7666 ***********************************************************************
 HV7666  DESIGNATION -  S E 156 A 1960
 HV7666  PID         -  HV7666
 HV7666  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7666  COUNTRY     -  US
 HV7666  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7666
 HV7666                         *CURRENT SURVEY CONTROL
 HV7666  ______________________________________________________________________
 HV7666* NAD 83(1993) POSITION- 38 52 56.66918(N) 076 56 47.00572(W)   ADJUSTED
 HV7666* NAVD 88 ORTHO HEIGHT -    58.    (meters)      190.    (feet) SCALED
 HV7666  ______________________________________________________________________
 HV7666  GEOID HEIGHT    -        -32.257 (meters)                     GEOID18
 HV7666  LAPLACE CORR    -         -3.87  (seconds)                    DEFLEC18
 HV7666  HORZ ORDER      -  SECOND
 HV7666
 HV7666.The horizontal coordinates were established by classical geodetic methods
 HV7666.and adjusted by the National Geodetic Survey in November 1994.
 HV7666
 HV7666.The orthometric height was scaled from a topographic map.
 HV7666
 HV7666.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7666.GEOID18 height accuracy estimate available here.
 HV7666
 HV7666.Click photographs - Photos may exist for this station.
 HV7666
 HV7666.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7666
 HV7666. The following values were computed from the NAD 83(1993) position.
 HV7666
 HV7666;                    North         East     Units Scale Factor Converg.
 HV7666;SPC MD       -   134,953.829   404,651.444   MT  0.99994985   +0 02 01.1
 HV7666;SPC MD       -   442,761.02  1,327,593.95   sFT  0.99994985   +0 02 01.1
 HV7666;SPC VA N     - 2,136,087.909 3,634,794.134   MT  0.99995905   +0 58 10.7
 HV7666;SPC VA N     - 7,008,148.41 11,925,153.75   sFT  0.99995905   +0 58 10.7
 HV7666;UTM  18      - 4,305,527.866   331,173.059   MT  0.99995098   -1 13 19.5
 HV7666
 HV7666!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7666!SPC MD       -   0.99999600  x   0.99994985  =   0.99994585
 HV7666!SPC VA N     -   0.99999600  x   0.99995905  =   0.99995505
 HV7666!UTM  18      -   0.99999600  x   0.99995098  =   0.99994698
 HV7666
 HV7666_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3117305527(NAD 83)
 HV7666
 HV7666|---------------------------------------------------------------------|
 HV7666| PID    Reference Object                     Distance      Geod. Az  |
 HV7666|                                                           dddmmss.s |
 HV7666| HV7663 S E 156 B 1960                      332.764 METERS 16223     |
 HV7666| HV1479 SE 156 DCDHT                        215.588 METERS 33428     |
 HV7666|---------------------------------------------------------------------|
 HV7666
 HV7666                          SUPERSEDED SURVEY CONTROL
 HV7666
 HV7666  NAD 83(1991)-  38 52 56.66782(N)    076 56 47.00681(W) AD(       ) 2
 HV7666  NAD 83(1986)-  38 52 56.66686(N)    076 56 47.01759(W) AD(       ) 2
 HV7666  NAD 27      -  38 52 56.26690(N)    076 56 48.10620(W) AD(       ) 2
 HV7666
 HV7666.Superseded values are not recommended for survey control.
 HV7666
 HV7666.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7666.See file dsdata.pdf to determine how the superseded data were derived.
 HV7666
 HV7666_MARKER: Z = SEE DESCRIPTION
 HV7666_SETTING: 0 = UNSPECIFIED SETTING
 HV7666_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7666
 HV7666  HISTORY     - Date     Condition        Report By
 HV7666  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7666  HISTORY     - 1971     GOOD             NGS
 HV7666
 HV7666                          STATION DESCRIPTION
 HV7666
 HV7666'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7666'THE STATION MARK IS AN IRON PIPE WITH A BRASS SCREW IN THE CENTER,
 HV7666'SET IN THE SIDEWALK.
 HV7666
 HV7666                          STATION RECOVERY (1971)
 HV7666
 HV7666'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7666'STATION AND REFERENCE POINTS RECOVERED IN GOOD CONDITION AS
 HV7666'INDICATED IN DESCRIPTION.  THE FOLLOWING CHANGES SHOULD BE
 HV7666'NOTED.  THE APARTMENT BUILDING BEARS THE NUMBERS 510, 512, AND
 HV7666'514.  IT IS NEXT TO CURB AND AT POINT OF JOINT WHERE THE CURVED
 HV7666'CUT STONE CURB FROM ALLEY JOINS THE STRAIGHT PART OF CONCRETE
 HV7666'CURBING.
 HV7666'
 HV7666'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7666'IN WASHINGTON, D.C.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7663 ***********************************************************************
 HV7663  DESIGNATION -  S E 156 B 1960
 HV7663  PID         -  HV7663
 HV7663  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7663  COUNTRY     -  US
 HV7663  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7663
 HV7663                         *CURRENT SURVEY CONTROL
 HV7663  ______________________________________________________________________
 HV7663* NAD 83(1993) POSITION- 38 52 46.38423(N) 076 56 42.82728(W)   ADJUSTED
 HV7663* NAVD 88 ORTHO HEIGHT -    61.    (meters)      200.    (feet) SCALED
 HV7663  ______________________________________________________________________
 HV7663  GEOID HEIGHT    -        -32.263 (meters)                     GEOID18
 HV7663  LAPLACE CORR    -         -3.96  (seconds)                    DEFLEC18
 HV7663  HORZ ORDER      -  SECOND
 HV7663
 HV7663.The horizontal coordinates were established by classical geodetic methods
 HV7663.and adjusted by the National Geodetic Survey in November 1994.
 HV7663
 HV7663.The orthometric height was scaled from a topographic map.
 HV7663
 HV7663.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7663.GEOID18 height accuracy estimate available here.
 HV7663
 HV7663.Click photographs - Photos may exist for this station.
 HV7663
 HV7663.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7663
 HV7663. The following values were computed from the NAD 83(1993) position.
 HV7663
 HV7663;                    North         East     Units Scale Factor Converg.
 HV7663;SPC MD       -   134,636.748   404,752.340   MT  0.99994985   +0 02 03.8
 HV7663;SPC MD       -   441,720.73  1,327,924.97   sFT  0.99994985   +0 02 03.8
 HV7663;SPC VA N     - 2,135,772.515 3,634,900.197   MT  0.99995882   +0 58 13.3
 HV7663;SPC VA N     - 7,007,113.66 11,925,501.73   sFT  0.99995882   +0 58 13.3
 HV7663;UTM  18      - 4,305,208.649   331,266.983   MT  0.99995059   -1 13 16.6
 HV7663
 HV7663!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7663!SPC MD       -   0.99999553  x   0.99994985  =   0.99994538
 HV7663!SPC VA N     -   0.99999553  x   0.99995882  =   0.99995435
 HV7663!UTM  18      -   0.99999553  x   0.99995059  =   0.99994612
 HV7663
 HV7663_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3126605208(NAD 83)
 HV7663
 HV7663|---------------------------------------------------------------------|
 HV7663| PID    Reference Object                     Distance      Geod. Az  |
 HV7663|                                                           dddmmss.s |
 HV7663| HV7670 S E 156 C 1960                      262.409 METERS 14837     |
 HV7663| HV7666 S E 156 A 1960                      332.764 METERS 34223     |
 HV7663|---------------------------------------------------------------------|
 HV7663
 HV7663                          SUPERSEDED SURVEY CONTROL
 HV7663
 HV7663  NAD 83(1991)-  38 52 46.38283(N)    076 56 42.82834(W) AD(       ) 2
 HV7663  NAD 83(1986)-  38 52 46.38190(N)    076 56 42.83917(W) AD(       ) 2
 HV7663  NAD 27      -  38 52 45.98220(N)    076 56 43.92780(W) AD(       ) 2
 HV7663
 HV7663.Superseded values are not recommended for survey control.
 HV7663
 HV7663.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7663.See file dsdata.pdf to determine how the superseded data were derived.
 HV7663
 HV7663_MARKER: Z = SEE DESCRIPTION
 HV7663_SETTING: 0 = UNSPECIFIED SETTING
 HV7663_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7663
 HV7663  HISTORY     - Date     Condition        Report By
 HV7663  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7663  HISTORY     - 1971     GOOD             NGS
 HV7663
 HV7663                          STATION DESCRIPTION
 HV7663
 HV7663'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7663'THE STATION MARK IS AN IRON PIPE WITH A BRASS SCREW IN THE CENTER,
 HV7663'SET IN THE SIDEWALK.
 HV7663
 HV7663                          STATION RECOVERY (1971)
 HV7663
 HV7663'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7663'THE STATION WAS RECOVERED IN GOOD CONDITION AND IS AGAINST
 HV7663'CURB.  THE REFERENCE POLES REFERRED TO HAVE BEEN REPLACED OR
 HV7663'RESET.  THE STATION IS NOW 50.9 FEET NORTH OF NAIL AND WASHER IN
 HV7663'POLE NO. 58962 AND 27.8 FET SOUTH OF THE CENTER OF POLE NO. 53466.
 HV7663'
 HV7663'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7663'IN WASHINGTON, D. C.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7670 ***********************************************************************
 HV7670  DESIGNATION -  S E 156 C 1960
 HV7670  PID         -  HV7670
 HV7670  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7670  COUNTRY     -  US
 HV7670  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7670
 HV7670                         *CURRENT SURVEY CONTROL
 HV7670  ______________________________________________________________________
 HV7670* NAD 83(1993) POSITION- 38 52 39.11937(N) 076 56 37.15848(W)   ADJUSTED
 HV7670* NAVD 88 ORTHO HEIGHT -    62.    (meters)      203.    (feet) SCALED
 HV7670  ______________________________________________________________________
 HV7670  GEOID HEIGHT    -        -32.269 (meters)                     GEOID18
 HV7670  LAPLACE CORR    -         -4.07  (seconds)                    DEFLEC18
 HV7670  HORZ ORDER      -  SECOND
 HV7670
 HV7670.The horizontal coordinates were established by classical geodetic methods
 HV7670.and adjusted by the National Geodetic Survey in November 1994.
 HV7670
 HV7670.The orthometric height was scaled from a topographic map.
 HV7670
 HV7670.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7670.GEOID18 height accuracy estimate available here.
 HV7670
 HV7670.Click photographs - Photos may exist for this station.
 HV7670
 HV7670.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7670
 HV7670. The following values were computed from the NAD 83(1993) position.
 HV7670
 HV7670;                    North         East     Units Scale Factor Converg.
 HV7670;SPC MD       -   134,412.816   404,889.111   MT  0.99994985   +0 02 07.3
 HV7670;SPC MD       -   440,986.05  1,328,373.69   sFT  0.99994985   +0 02 07.3
 HV7670;SPC VA N     - 2,135,550.846 3,635,040.608   MT  0.99995866   +0 58 16.8
 HV7670;SPC VA N     - 7,006,386.40 11,925,962.39   sFT  0.99995866   +0 58 16.8
 HV7670;UTM  18      - 4,304,981.774   331,398.814   MT  0.99995005   -1 13 12.9
 HV7670
 HV7670!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7670!SPC MD       -   0.99999537  x   0.99994985  =   0.99994522
 HV7670!SPC VA N     -   0.99999537  x   0.99995866  =   0.99995403
 HV7670!UTM  18      -   0.99999537  x   0.99995005  =   0.99994542
 HV7670
 HV7670:                Primary Azimuth Mark                     Grid Az
 HV7670:SPC MD       -  SE 162 RESET                             124 56 56.6
 HV7670:SPC VA N     -  SE 162 RESET                             124 00 47.1
 HV7670:UTM  18      -  SE 162 RESET                             126 12 16.8
 HV7670
 HV7670_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3139804981(NAD 83)
 HV7670
 HV7670|---------------------------------------------------------------------|
 HV7670| PID    Reference Object                     Distance      Geod. Az  |
 HV7670|                                                           dddmmss.s |
 HV7670| HV1478 SE 162 RESET                        APPROX. 0.8 KM 1245903.9 |
 HV7670| HV7663 S E 156 B 1960                      262.409 METERS 32837     |
 HV7670|---------------------------------------------------------------------|
 HV7670
 HV7670                          SUPERSEDED SURVEY CONTROL
 HV7670
 HV7670  NAD 83(1991)-  38 52 39.11793(N)    076 56 37.15951(W) AD(       ) 2
 HV7670  NAD 83(1986)-  38 52 39.11702(N)    076 56 37.17040(W) AD(       ) 2
 HV7670  NAD 27      -  38 52 38.71770(N)    076 56 38.25920(W) AD(       ) 2
 HV7670
 HV7670.Superseded values are not recommended for survey control.
 HV7670
 HV7670.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7670.See file dsdata.pdf to determine how the superseded data were derived.
 HV7670
 HV7670_MARKER: DS = TRIANGULATION STATION DISK
 HV7670_SETTING: 0 = UNSPECIFIED SETTING
 HV7670_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7670
 HV7670  HISTORY     - Date     Condition        Report By
 HV7670  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7670  HISTORY     - 1971     GOOD             NGS
 HV7670
 HV7670                          STATION DESCRIPTION
 HV7670
 HV7670'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7670'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV7670'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. S.E. 156-C
 HV7670'GROUTED IN CONCRETE CURB.
 HV7670
 HV7670                          STATION RECOVERY (1971)
 HV7670
 HV7670'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7670'THE STATION AND ALL REFERENCE POINTS GIVEN ARE IN GOOD CONDITION
 HV7670'AS SHOWN ON SKETCH.
 HV7670'
 HV7670'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7670'IN WASHINGTON, D. C.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7646 ***********************************************************************
 HV7646  DESIGNATION -  S E 157 A 1960
 HV7646  PID         -  HV7646
 HV7646  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7646  COUNTRY     -  US
 HV7646  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7646
 HV7646                         *CURRENT SURVEY CONTROL
 HV7646  ______________________________________________________________________
 HV7646* NAD 83(1993) POSITION- 38 53 12.70794(N) 076 55 36.99496(W)   ADJUSTED
 HV7646* NAVD 88 ORTHO HEIGHT -    50.    (meters)      164.    (feet) SCALED
 HV7646  ______________________________________________________________________
 HV7646  GEOID HEIGHT    -        -32.295 (meters)                     GEOID18
 HV7646  LAPLACE CORR    -         -4.62  (seconds)                    DEFLEC18
 HV7646  HORZ ORDER      -  SECOND
 HV7646
 HV7646.The horizontal coordinates were established by classical geodetic methods
 HV7646.and adjusted by the National Geodetic Survey in November 1994.
 HV7646
 HV7646.The orthometric height was scaled from a topographic map.
 HV7646
 HV7646.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7646.GEOID18 height accuracy estimate available here.
 HV7646
 HV7646.Click photographs - Photos may exist for this station.
 HV7646
 HV7646.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7646
 HV7646. The following values were computed from the NAD 83(1993) position.
 HV7646
 HV7646;                    North         East     Units Scale Factor Converg.
 HV7646;SPC MD       -   135,449.562   406,338.409   MT  0.99994987   +0 02 45.1
 HV7646;SPC MD       -   444,387.44  1,333,128.60   sFT  0.99994987   +0 02 45.1
 HV7646;SPC VA N     - 2,136,611.137 3,636,472.792   MT  0.99995941   +0 58 54.4
 HV7646;SPC VA N     - 7,009,865.04 11,930,661.15   sFT  0.99995941   +0 58 54.4
 HV7646;UTM  18      - 4,305,986.508   332,870.480   MT  0.99994396   -1 12 35.9
 HV7646
 HV7646!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7646!SPC MD       -   0.99999726  x   0.99994987  =   0.99994713
 HV7646!SPC VA N     -   0.99999726  x   0.99995941  =   0.99995667
 HV7646!UTM  18      -   0.99999726  x   0.99994396  =   0.99994122
 HV7646
 HV7646:                Primary Azimuth Mark                     Grid Az
 HV7646:SPC MD       -  SE 157                                   097 54 23.2
 HV7646:SPC VA N     -  SE 157                                   096 58 13.9
 HV7646:UTM  18      -  SE 157                                   099 09 44.2
 HV7646
 HV7646_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3287005986(NAD 83)
 HV7646
 HV7646|---------------------------------------------------------------------|
 HV7646| PID    Reference Object                     Distance      Geod. Az  |
 HV7646|                                                           dddmmss.s |
 HV7646| HV1477 SE 157                              425.870 METERS 0975708.3 |
 HV7646| HV7645 S E 157 B 1960                      228.159 METERS 28233     |
 HV7646|---------------------------------------------------------------------|
 HV7646
 HV7646                          SUPERSEDED SURVEY CONTROL
 HV7646
 HV7646  NAD 83(1991)-  38 53 12.70661(N)    076 55 36.99605(W) AD(       ) 2
 HV7646  NAD 83(1986)-  38 53 12.70550(N)    076 55 37.00677(W) AD(       ) 2
 HV7646  NAD 27      -  38 53 12.30440(N)    076 55 38.09920(W) AD(       ) 2
 HV7646
 HV7646.Superseded values are not recommended for survey control.
 HV7646
 HV7646.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7646.See file dsdata.pdf to determine how the superseded data were derived.
 HV7646
 HV7646_MARKER: Z = SEE DESCRIPTION
 HV7646_SETTING: 0 = UNSPECIFIED SETTING
 HV7646_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7646
 HV7646  HISTORY     - Date     Condition        Report By
 HV7646  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7646  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7646
 HV7646                          STATION DESCRIPTION
 HV7646
 HV7646'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7646'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7646
 HV7646                          STATION RECOVERY (1971)
 HV7646
 HV7646'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7646'STATION WAS NOT RECOVERED.  A JUNKED CAR WAS PARKED OVER STATION
 HV7646'SITE.  ALL REFERENCE POINTS REMAIN AS GIVEN WITH THE EXCEPTION OF
 HV7646'PEPCO POLE 525735, THIS POLE HAS BEEN REPLACED BY A NEW POLE AND
 HV7646'GIVEN THE SAME NUMBER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7645 ***********************************************************************
 HV7645  DESIGNATION -  S E 157 B 1960
 HV7645  PID         -  HV7645
 HV7645  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7645  COUNTRY     -  US
 HV7645  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7645
 HV7645                         *CURRENT SURVEY CONTROL
 HV7645  ______________________________________________________________________
 HV7645* NAD 83(1993) POSITION- 38 53 14.31612(N) 076 55 46.23538(W)   ADJUSTED
 HV7645* NAVD 88 ORTHO HEIGHT -    55.    (meters)      180.    (feet) SCALED
 HV7645  ______________________________________________________________________
 HV7645  GEOID HEIGHT    -        -32.288 (meters)                     GEOID18
 HV7645  LAPLACE CORR    -         -4.56  (seconds)                    DEFLEC18
 HV7645  HORZ ORDER      -  SECOND
 HV7645
 HV7645.The horizontal coordinates were established by classical geodetic methods
 HV7645.and adjusted by the National Geodetic Survey in November 1994.
 HV7645
 HV7645.The orthometric height was scaled from a topographic map.
 HV7645
 HV7645.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7645.GEOID18 height accuracy estimate available here.
 HV7645
 HV7645.Click photographs - Photos may exist for this station.
 HV7645
 HV7645.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7645
 HV7645. The following values were computed from the NAD 83(1993) position.
 HV7645
 HV7645;                    North         East     Units Scale Factor Converg.
 HV7645;SPC MD       -   135,498.976   406,115.677   MT  0.99994987   +0 02 39.3
 HV7645;SPC MD       -   444,549.56  1,332,397.85   sFT  0.99994987   +0 02 39.3
 HV7645;SPC VA N     - 2,136,656.907 3,636,249.280   MT  0.99995944   +0 58 48.6
 HV7645;SPC VA N     - 7,010,015.20 11,929,927.85   sFT  0.99995944   +0 58 48.6
 HV7645;UTM  18      - 4,306,040.791   332,648.886   MT  0.99994487   -1 12 41.8
 HV7645
 HV7645!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7645!SPC MD       -   0.99999647  x   0.99994987  =   0.99994634
 HV7645!SPC VA N     -   0.99999647  x   0.99995944  =   0.99995591
 HV7645!UTM  18      -   0.99999647  x   0.99994487  =   0.99994134
 HV7645
 HV7645:                Primary Azimuth Mark                     Grid Az
 HV7645:SPC MD       -  S E 157 C 1960                           268 03 36.0
 HV7645:SPC VA N     -  S E 157 C 1960                           267 07 26.7
 HV7645:UTM  18      -  S E 157 C 1960                           269 18 57.1
 HV7645
 HV7645_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3264806040(NAD 83)
 HV7645
 HV7645|---------------------------------------------------------------------|
 HV7645| PID    Reference Object                     Distance      Geod. Az  |
 HV7645|                                                           dddmmss.s |
 HV7645| HV7646 S E 157 A 1960                      228.159 METERS 10233     |
 HV7645| HV7658 S E 157 C 1960                      APPROX. 0.9 KM 2680615.3 |
 HV7645|---------------------------------------------------------------------|
 HV7645
 HV7645                          SUPERSEDED SURVEY CONTROL
 HV7645
 HV7645  NAD 83(1991)-  38 53 14.31479(N)    076 55 46.23648(W) AD(       ) 2
 HV7645  NAD 83(1986)-  38 53 14.31370(N)    076 55 46.24719(W) AD(       ) 2
 HV7645  NAD 27      -  38 53 13.91260(N)    076 55 47.33880(W) AD(       ) 2
 HV7645
 HV7645.Superseded values are not recommended for survey control.
 HV7645
 HV7645.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7645.See file dsdata.pdf to determine how the superseded data were derived.
 HV7645
 HV7645_MARKER: Z = SEE DESCRIPTION
 HV7645_SETTING: 0 = UNSPECIFIED SETTING
 HV7645_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7645
 HV7645  HISTORY     - Date     Condition        Report By
 HV7645  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7645  HISTORY     - 1971     GOOD             NGS
 HV7645
 HV7645                          STATION DESCRIPTION
 HV7645
 HV7645'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7645'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7645
 HV7645                          STATION RECOVERY (1971)
 HV7645
 HV7645'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7645'STATION RECOVERED AND FOUND TO BE IN GOOD CONDITION.  IT IS NEXT
 HV7645'TO A DRIVEWAY AND AT THE NORTH EDGE OF WALK, ALSO 13.6 FEET
 HV7645'EAST-NORTHEAST OF THE TOP NUT ON A FIRE HYDRANT.  REFERENCE
 HV7645'POINTS WERE RECOVERED WITH THE EXCEPTION THE CHISELED CROSS ON
 HV7645'MANHOLE RIM LOCATED IN STREET TO SOUTHWEST OF STATION WAS COVERED
 HV7645'WITH ASPHALT AND COULD NOT BE VISIBLY SEEN.
 HV7645'
 HV7645'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7645'IN WASHINGTON, D.C.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7658 ***********************************************************************
 HV7658  DESIGNATION -  S E 157 C 1960
 HV7658  PID         -  HV7658
 HV7658  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7658  COUNTRY     -  US
 HV7658  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7658
 HV7658                         *CURRENT SURVEY CONTROL
 HV7658  ______________________________________________________________________
 HV7658* NAD 83(1993) POSITION- 38 53 13.34180(N) 076 56 23.83406(W)   ADJUSTED
 HV7658* NAVD 88 ORTHO HEIGHT -    49.    (meters)      161.    (feet) SCALED
 HV7658  ______________________________________________________________________
 HV7658  GEOID HEIGHT    -        -32.265 (meters)                     GEOID18
 HV7658  LAPLACE CORR    -         -4.16  (seconds)                    DEFLEC18
 HV7658  HORZ ORDER      -  SECOND
 HV7658
 HV7658.The horizontal coordinates were established by classical geodetic methods
 HV7658.and adjusted by the National Geodetic Survey in November 1994.
 HV7658
 HV7658.The orthometric height was scaled from a topographic map.
 HV7658
 HV7658.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7658.GEOID18 height accuracy estimate available here.
 HV7658
 HV7658.Click photographs - Photos may exist for this station.
 HV7658
 HV7658.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7658
 HV7658. The following values were computed from the NAD 83(1993) position.
 HV7658
 HV7658;                    North         East     Units Scale Factor Converg.
 HV7658;SPC MD       -   135,468.285   405,209.576   MT  0.99994987   +0 02 15.7
 HV7658;SPC MD       -   444,448.87  1,329,425.08   sFT  0.99994987   +0 02 15.7
 HV7658;SPC VA N     - 2,136,611.418 3,635,343.793   MT  0.99995942   +0 58 25.1
 HV7658;SPC VA N     - 7,009,865.96 11,926,957.09   sFT  0.99995942   +0 58 25.1
 HV7658;UTM  18      - 4,306,029.966   331,742.333   MT  0.99994862   -1 13 05.4
 HV7658
 HV7658!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7658!SPC MD       -   0.99999741  x   0.99994987  =   0.99994728
 HV7658!SPC VA N     -   0.99999741  x   0.99995942  =   0.99995683
 HV7658!UTM  18      -   0.99999741  x   0.99994862  =   0.99994603
 HV7658
 HV7658:                Primary Azimuth Mark                     Grid Az
 HV7658:SPC MD       -  S E 157 B 1960                           088 03 36.0
 HV7658:SPC VA N     -  S E 157 B 1960                           087 07 26.6
 HV7658:UTM  18      -  S E 157 B 1960                           089 18 57.1
 HV7658
 HV7658_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3174206029(NAD 83)
 HV7658
 HV7658|---------------------------------------------------------------------|
 HV7658| PID    Reference Object                     Distance      Geod. Az  |
 HV7658|                                                           dddmmss.s |
 HV7658| HV7645 S E 157 B 1960                      APPROX. 0.9 KM 0880551.7 |
 HV7658|---------------------------------------------------------------------|
 HV7658
 HV7658                          SUPERSEDED SURVEY CONTROL
 HV7658
 HV7658  NAD 83(1991)-  38 53 13.34048(N)    076 56 23.83516(W) AD(       ) 2
 HV7658  NAD 83(1986)-  38 53 13.33944(N)    076 56 23.84587(W) AD(       ) 2
 HV7658  NAD 27      -  38 53 12.93880(N)    076 56 24.93560(W) AD(       ) 2
 HV7658
 HV7658.Superseded values are not recommended for survey control.
 HV7658
 HV7658.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7658.See file dsdata.pdf to determine how the superseded data were derived.
 HV7658
 HV7658_MARKER: Z = SEE DESCRIPTION
 HV7658_SETTING: 0 = UNSPECIFIED SETTING
 HV7658_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7658
 HV7658  HISTORY     - Date     Condition        Report By
 HV7658  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7658  HISTORY     - 1971     GOOD             NGS
 HV7658
 HV7658                          STATION DESCRIPTION
 HV7658
 HV7658'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7658'THE STATION IS A CROSS CUT IN THE RIM OF THE ROOF DRAIN.
 HV7658
 HV7658                          STATION RECOVERY (1971)
 HV7658
 HV7658'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7658'STATION RECOVERED AS SHOWN ON SKETCH OF DESCRIPTION.
 HV7658'
 HV7658'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7658'IN WASHINGTON, D.C.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4697 ***********************************************************************
 HV4697  DESIGNATION -  S E 158 A 1960
 HV4697  PID         -  HV4697
 HV4697  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4697  COUNTRY     -  US
 HV4697  USGS QUAD   -  ALEXANDRIA (2019)
 HV4697
 HV4697                         *CURRENT SURVEY CONTROL
 HV4697  ______________________________________________________________________
 HV4697* NAD 83(1993) POSITION- 38 51 28.48150(N) 077 00 17.97975(W)   ADJUSTED
 HV4697* NAVD 88 ORTHO HEIGHT -     3.    (meters)       10.    (feet) SCALED
 HV4697  ______________________________________________________________________
 HV4697  GEOID HEIGHT    -        -32.191 (meters)                     GEOID18
 HV4697  LAPLACE CORR    -         -2.75  (seconds)                    DEFLEC18
 HV4697  HORZ ORDER      -  SECOND
 HV4697
 HV4697.The horizontal coordinates were established by classical geodetic methods
 HV4697.and adjusted by the National Geodetic Survey in November 1994.
 HV4697
 HV4697.The orthometric height was scaled from a topographic map.
 HV4697
 HV4697.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4697.GEOID18 height accuracy estimate available here.
 HV4697
 HV4697.Click photographs - Photos may exist for this station.
 HV4697
 HV4697.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4697
 HV4697. The following values were computed from the NAD 83(1993) position.
 HV4697
 HV4697;                    North         East     Units Scale Factor Converg.
 HV4697;SPC MD       -   132,233.173   399,566.513   MT  0.99994990   -0 00 11.3
 HV4697;SPC MD       -   433,835.00  1,310,911.13   sFT  0.99994990   -0 00 11.3
 HV4697;SPC VA N     - 2,133,284.520 3,629,754.288   MT  0.99995716   +0 55 59.0
 HV4697;SPC VA N     - 6,998,950.96 11,908,618.86   sFT  0.99995716   +0 55 59.0
 HV4697;UTM  18      - 4,302,919.239   326,029.680   MT  0.99997270   -1 15 29.6
 HV4697
 HV4697!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4697!SPC MD       -   1.00000462  x   0.99994990  =   0.99995452
 HV4697!SPC VA N     -   1.00000462  x   0.99995716  =   0.99996178
 HV4697!UTM  18      -   1.00000462  x   0.99997270  =   0.99997732
 HV4697
 HV4697:                Primary Azimuth Mark                     Grid Az
 HV4697:SPC MD       -  S E 158 B 1960                           194 39 48.3
 HV4697:SPC VA N     -  S E 158 B 1960                           193 43 38.0
 HV4697:UTM  18      -  S E 158 B 1960                           195 55 06.6
 HV4697
 HV4697_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2602902919(NAD 83)
 HV4697
 HV4697|---------------------------------------------------------------------|
 HV4697| PID    Reference Object                     Distance      Geod. Az  |
 HV4697|                                                           dddmmss.s |
 HV4697| HV4699 S E 158 B 1960                      APPROX. 0.8 KM 1943937.0 |
 HV4697|---------------------------------------------------------------------|
 HV4697
 HV4697                          SUPERSEDED SURVEY CONTROL
 HV4697
 HV4697  NAD 83(1991)-  38 51 28.48012(N)    077 00 17.98094(W) AD(       ) 2
 HV4697  NAD 83(1986)-  38 51 28.47955(N)    077 00 17.99201(W) AD(       ) 2
 HV4697  NAD 27      -  38 51 28.07630(N)    077 00 19.07400(W) AD(       ) 2
 HV4697
 HV4697.Superseded values are not recommended for survey control.
 HV4697
 HV4697.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4697.See file dsdata.pdf to determine how the superseded data were derived.
 HV4697
 HV4697_MARKER: Z = SEE DESCRIPTION
 HV4697_SETTING: 0 = UNSPECIFIED SETTING
 HV4697_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4697
 HV4697  HISTORY     - Date     Condition        Report By
 HV4697  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4697  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4697
 HV4697                          STATION DESCRIPTION
 HV4697
 HV4697'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4697'STATION WAS NOT RECOVERED, REFERENCE POINTS ALL RECOVERED AND
 HV4697'STATION WAS DUG FOR BUT NO EVIDENCE OF STATION UNCOVERED.
 HV4697'
 HV4697'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4697'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4699 ***********************************************************************
 HV4699  DESIGNATION -  S E 158 B 1960
 HV4699  PID         -  HV4699
 HV4699  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4699  COUNTRY     -  US
 HV4699  USGS QUAD   -  ALEXANDRIA (2019)
 HV4699
 HV4699                         *CURRENT SURVEY CONTROL
 HV4699  ______________________________________________________________________
 HV4699* NAD 83(1993) POSITION- 38 51 03.51784(N) 077 00 26.33127(W)   ADJUSTED
 HV4699* NAVD 88 ORTHO HEIGHT -     9.    (meters)       30.    (feet) SCALED
 HV4699  ______________________________________________________________________
 HV4699  GEOID HEIGHT    -        -32.197 (meters)                     GEOID18
 HV4699  LAPLACE CORR    -         -2.59  (seconds)                    DEFLEC18
 HV4699  HORZ ORDER      -  SECOND
 HV4699
 HV4699.The horizontal coordinates were established by classical geodetic methods
 HV4699.and adjusted by the National Geodetic Survey in November 1994.
 HV4699
 HV4699.The orthometric height was scaled from a topographic map.
 HV4699
 HV4699.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4699.GEOID18 height accuracy estimate available here.
 HV4699
 HV4699.Click photographs - Photos may exist for this station.
 HV4699
 HV4699.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4699
 HV4699. The following values were computed from the NAD 83(1993) position.
 HV4699
 HV4699;                    North         East     Units Scale Factor Converg.
 HV4699;SPC MD       -   131,463.424   399,365.098   MT  0.99994994   -0 00 16.5
 HV4699;SPC MD       -   431,309.58  1,310,250.33   sFT  0.99994994   -0 00 16.5
 HV4699;SPC VA N     - 2,132,511.577 3,629,565.476   MT  0.99995666   +0 55 53.8
 HV4699;SPC VA N     - 6,996,415.07 11,907,999.40   sFT  0.99995666   +0 55 53.8
 HV4699;UTM  18      - 4,302,154.069   325,811.449   MT  0.99997363   -1 15 34.2
 HV4699
 HV4699!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4699!SPC MD       -   1.00000368  x   0.99994994  =   0.99995362
 HV4699!SPC VA N     -   1.00000368  x   0.99995666  =   0.99996034
 HV4699!UTM  18      -   1.00000368  x   0.99997363  =   0.99997731
 HV4699
 HV4699_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2581102154(NAD 83)
 HV4699
 HV4699                          SUPERSEDED SURVEY CONTROL
 HV4699
 HV4699  NAD 83(1991)-  38 51 03.51644(N)    077 00 26.33247(W) AD(       ) 2
 HV4699  NAD 83(1986)-  38 51 03.51592(N)    077 00 26.34365(W) AD(       ) 2
 HV4699  NAD 27      -  38 51 03.11190(N)    077 00 27.42520(W) AD(       ) 2
 HV4699
 HV4699.Superseded values are not recommended for survey control.
 HV4699
 HV4699.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4699.See file dsdata.pdf to determine how the superseded data were derived.
 HV4699
 HV4699_MARKER: Z = SEE DESCRIPTION
 HV4699_SETTING: 0 = UNSPECIFIED SETTING
 HV4699_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4699
 HV4699  HISTORY     - Date     Condition        Report By
 HV4699  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4699  HISTORY     - 1965     MARK NOT FOUND   DCDHT
 HV4699  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4699
 HV4699                          STATION DESCRIPTION
 HV4699
 HV4699'DESCRIBED BY DC DEPARTMENT OF HIGHWAYS AND TRAFFIC 1965
 HV4699'REPORTED DESTROYED D.C. DEPARTMENT OF HIGHWAYS AND TRAFFIC
 HV4699
 HV4699                          STATION RECOVERY (1971)
 HV4699
 HV4699'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4699'THE STATION WAS NOT RECOVERED AND NEITHER WERE THE REFERENCE
 HV4699'POINTS.  IT IS BELIEVED THAT THIS STATION WAS DESTROYED BY
 HV4699'CONSTRUCTION IN THE AREA.
 HV4699'
 HV4699'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4699'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4703 ***********************************************************************
 HV4703  DESIGNATION -  S E 158 C 1960
 HV4703  PID         -  HV4703
 HV4703  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4703  COUNTRY     -  US
 HV4703  USGS QUAD   -  ALEXANDRIA (2019)
 HV4703
 HV4703                         *CURRENT SURVEY CONTROL
 HV4703  ______________________________________________________________________
 HV4703* NAD 83(1993) POSITION- 38 50 55.13711(N) 077 00 29.36307(W)   ADJUSTED
 HV4703* NAVD 88 ORTHO HEIGHT -    11.    (meters)       36.    (feet) SCALED
 HV4703  ______________________________________________________________________
 HV4703  GEOID HEIGHT    -        -32.199 (meters)                     GEOID18
 HV4703  LAPLACE CORR    -         -2.58  (seconds)                    DEFLEC18
 HV4703  HORZ ORDER      -  SECOND
 HV4703
 HV4703.The horizontal coordinates were established by classical geodetic methods
 HV4703.and adjusted by the National Geodetic Survey in November 1994.
 HV4703
 HV4703.The orthometric height was scaled from a topographic map.
 HV4703
 HV4703.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4703.GEOID18 height accuracy estimate available here.
 HV4703
 HV4703.Click photographs - Photos may exist for this station.
 HV4703
 HV4703.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4703
 HV4703. The following values were computed from the NAD 83(1993) position.
 HV4703
 HV4703;                    North         East     Units Scale Factor Converg.
 HV4703;SPC MD       -   131,205.008   399,291.972   MT  0.99994996   -0 00 18.4
 HV4703;SPC MD       -   430,461.76  1,310,010.41   sFT  0.99994996   -0 00 18.4
 HV4703;SPC VA N     - 2,132,251.999 3,629,496.581   MT  0.99995650   +0 55 51.9
 HV4703;SPC VA N     - 6,995,563.43 11,907,773.37   sFT  0.99995650   +0 55 51.9
 HV4703;UTM  18      - 4,301,897.310   325,732.680   MT  0.99997397   -1 15 35.9
 HV4703
 HV4703!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4703!SPC MD       -   1.00000337  x   0.99994996  =   0.99995333
 HV4703!SPC VA N     -   1.00000337  x   0.99995650  =   0.99995987
 HV4703!UTM  18      -   1.00000337  x   0.99997397  =   0.99997734
 HV4703
 HV4703_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2573201897(NAD 83)
 HV4703
 HV4703                          SUPERSEDED SURVEY CONTROL
 HV4703
 HV4703  NAD 83(1991)-  38 50 55.13570(N)    077 00 29.36428(W) AD(       ) 2
 HV4703  NAD 83(1986)-  38 50 55.13519(N)    077 00 29.37550(W) AD(       ) 2
 HV4703  NAD 27      -  38 50 54.73060(N)    077 00 30.45700(W) AD(       ) 2
 HV4703
 HV4703.Superseded values are not recommended for survey control.
 HV4703
 HV4703.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4703.See file dsdata.pdf to determine how the superseded data were derived.
 HV4703
 HV4703_MARKER: DS = TRIANGULATION STATION DISK
 HV4703_SETTING: 0 = UNSPECIFIED SETTING
 HV4703_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4703
 HV4703  HISTORY     - Date     Condition        Report By
 HV4703  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4703  HISTORY     - 1962     MARK NOT FOUND   CGS
 HV4703  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4703
 HV4703                          STATION DESCRIPTION
 HV4703
 HV4703'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4703'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4703'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO S E 158-C SET IN
 HV4703'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV4703'COVER WITH LID LABELED SURVEY.
 HV4703
 HV4703                          STATION RECOVERY (1962)
 HV4703
 HV4703'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1962 (CEO)
 HV4703'STATION S.E. 158-C WAS DESTROYED BY HIGHWAY CONSTRUCTION.  THE
 HV4703'AZIMUTH FOR STATION 163 S.E. WAS TRANSFERRED TO THE CENTER
 HV4703'ANTENNAE ON THE CONTROL TOWER, WASHINGTON NATIONAL AIRPORT.
 HV4703
 HV4703                          STATION RECOVERY (1971)
 HV4703
 HV4703'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4703'STATION WAS NOT RECOVERED AND BELIEVED DESTROYED AS REPORTED
 HV4703'IN 1962.
 HV4703'
 HV4703'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4703'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4725 ***********************************************************************
 HV4725  DESIGNATION -  S E 159 A 1960
 HV4725  PID         -  HV4725
 HV4725  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4725  COUNTRY     -  US
 HV4725  USGS QUAD   -  ALEXANDRIA (2019)
 HV4725
 HV4725                         *CURRENT SURVEY CONTROL
 HV4725  ______________________________________________________________________
 HV4725* NAD 83(1993) POSITION- 38 52 10.08387(N) 077 00 03.58942(W)   ADJUSTED
 HV4725* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV4725  ______________________________________________________________________
 HV4725  GEOID HEIGHT    -        -32.180 (meters)                     GEOID18
 HV4725  LAPLACE CORR    -         -3.08  (seconds)                    DEFLEC18
 HV4725  HORZ ORDER      -  SECOND
 HV4725
 HV4725.The horizontal coordinates were established by classical geodetic methods
 HV4725.and adjusted by the National Geodetic Survey in November 1994.
 HV4725
 HV4725.The orthometric height was scaled from a topographic map.
 HV4725
 HV4725.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4725.GEOID18 height accuracy estimate available here.
 HV4725
 HV4725.Click photographs - Photos may exist for this station.
 HV4725
 HV4725.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4725
 HV4725. The following values were computed from the NAD 83(1993) position.
 HV4725
 HV4725;                    North         East     Units Scale Factor Converg.
 HV4725;SPC MD       -   133,515.986   399,913.474   MT  0.99994985   -0 00 02.3
 HV4725;SPC MD       -   438,043.70  1,312,049.46   sFT  0.99994985   -0 00 02.3
 HV4725;SPC VA N     - 2,134,572.840 3,630,080.245   MT  0.99995803   +0 56 08.0
 HV4725;SPC VA N     - 7,003,177.73 11,909,688.27   sFT  0.99995803   +0 56 08.0
 HV4725;UTM  18      - 4,304,194.172   326,404.668   MT  0.99997109   -1 15 21.7
 HV4725
 HV4725!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4725!SPC MD       -   1.00000493  x   0.99994985  =   0.99995478
 HV4725!SPC VA N     -   1.00000493  x   0.99995803  =   0.99996296
 HV4725!UTM  18      -   1.00000493  x   0.99997109  =   0.99997602
 HV4725
 HV4725:                Primary Azimuth Mark                     Grid Az
 HV4725:SPC MD       -  SE 159 DCDHT                             085 59 03.0
 HV4725:SPC VA N     -  SE 159 DCDHT                             085 02 52.7
 HV4725:UTM  18      -  SE 159 DCDHT                             087 14 22.4
 HV4725
 HV4725_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2640404194(NAD 83)
 HV4725
 HV4725|---------------------------------------------------------------------|
 HV4725| PID    Reference Object                     Distance      Geod. Az  |
 HV4725|                                                           dddmmss.s |
 HV4725| HV1474 SE 159 DCDHT                        APPROX. 1.0 KM 0855900.7 |
 HV4725|---------------------------------------------------------------------|
 HV4725
 HV4725                          SUPERSEDED SURVEY CONTROL
 HV4725
 HV4725  NAD 83(1991)-  38 52 10.08254(N)    077 00 03.59057(W) AD(       ) 2
 HV4725  NAD 83(1986)-  38 52 10.08194(N)    077 00 03.60146(W) AD(       ) 2
 HV4725  NAD 27      -  38 52 09.67950(N)    077 00 04.68410(W) AD(       ) 2
 HV4725
 HV4725.Superseded values are not recommended for survey control.
 HV4725
 HV4725.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4725.See file dsdata.pdf to determine how the superseded data were derived.
 HV4725
 HV4725_MARKER: DS = TRIANGULATION STATION DISK
 HV4725_SETTING: 0 = UNSPECIFIED SETTING
 HV4725_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4725
 HV4725  HISTORY     - Date     Condition        Report By
 HV4725  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4725  HISTORY     - 1971     GOOD             NGS
 HV4725
 HV4725                          STATION DESCRIPTION
 HV4725
 HV4725'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4725'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4725'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO SE 159A SET IN
 HV4725'THE TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV4725'COVER WITH LID LABELED SURVEY.
 HV4725
 HV4725                          STATION RECOVERY (1971)
 HV4725
 HV4725'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4725'STATION WAS RECOVERED IN GOOD CONDITION.  THE LID TO MANHOLE
 HV4725'COVERING THE STATION WAS FOUND TO BE BROKEN.  THE STREET INLET
 HV4725'DRAIN NO LONGER EXISTS.  CHANGES IN THE AREA REQUIRES A NEW
 HV4725'SKETCH DESCRIPTION.
 HV4725'
 HV4725'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4725'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7553 ***********************************************************************
 HV7553  DESIGNATION -  S E 160 A 1960
 HV7553  PID         -  HV7553
 HV7553  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7553  COUNTRY     -  US
 HV7553  USGS QUAD   -  ANACOSTIA (2016)
 HV7553
 HV7553                         *CURRENT SURVEY CONTROL
 HV7553  ______________________________________________________________________
 HV7553* NAD 83(1993) POSITION- 38 51 25.78198(N) 076 58 11.00107(W)   ADJUSTED
 HV7553* NAVD 88 ORTHO HEIGHT -    87.    (meters)      285.    (feet) SCALED
 HV7553  ______________________________________________________________________
 HV7553  GEOID HEIGHT    -        -32.248 (meters)                     GEOID18
 HV7553  LAPLACE CORR    -         -3.40  (seconds)                    DEFLEC18
 HV7553  HORZ ORDER      -  SECOND
 HV7553
 HV7553.The horizontal coordinates were established by classical geodetic methods
 HV7553.and adjusted by the National Geodetic Survey in November 1994.
 HV7553
 HV7553.The orthometric height was scaled from a topographic map.
 HV7553
 HV7553.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7553.GEOID18 height accuracy estimate available here.
 HV7553
 HV7553.Click photographs - Photos may exist for this station.
 HV7553
 HV7553.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7553
 HV7553. The following values were computed from the NAD 83(1993) position.
 HV7553
 HV7553;                    North         East     Units Scale Factor Converg.
 HV7553;SPC MD       -   132,150.356   402,627.963   MT  0.99994990   +0 01 08.4
 HV7553;SPC MD       -   433,563.29  1,320,955.24   sFT  0.99994990   +0 01 08.4
 HV7553;SPC VA N     - 2,133,251.731 3,632,816.704   MT  0.99995711   +0 57 18.3
 HV7553;SPC VA N     - 6,998,843.39 11,918,666.14   sFT  0.99995711   +0 57 18.3
 HV7553;UTM  18      - 4,302,769.383   329,088.631   MT  0.99995971   -1 14 09.8
 HV7553
 HV7553!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7553!SPC MD       -   0.99999145  x   0.99994990  =   0.99994135
 HV7553!SPC VA N     -   0.99999145  x   0.99995711  =   0.99994856
 HV7553!UTM  18      -   0.99999145  x   0.99995971  =   0.99995116
 HV7553
 HV7553:                Primary Azimuth Mark                     Grid Az
 HV7553:SPC MD       -  GARFIELD                                 188 44 12.0
 HV7553:SPC VA N     -  GARFIELD                                 187 48 02.1
 HV7553:UTM  18      -  GARFIELD                                 189 59 30.2
 HV7553
 HV7553_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2908802769(NAD 83)
 HV7553
 HV7553|---------------------------------------------------------------------|
 HV7553| PID    Reference Object                     Distance      Geod. Az  |
 HV7553|                                                           dddmmss.s |
 HV7553| HV1454 SE 160                              376.214 METERS 03440     |
 HV7553| HV7551 GARFIELD                            APPROX. 0.6 KM 1884520.4 |
 HV7553|---------------------------------------------------------------------|
 HV7553
 HV7553                          SUPERSEDED SURVEY CONTROL
 HV7553
 HV7553  NAD 83(1991)-  38 51 25.78048(N)    076 58 11.00180(W) AD(       ) 2
 HV7553  NAD 83(1986)-  38 51 25.77983(N)    076 58 11.01316(W) AD(       ) 2
 HV7553  NAD 27      -  38 51 25.37980(N)    076 58 12.10640(W) AD(       ) 2
 HV7553
 HV7553.Superseded values are not recommended for survey control.
 HV7553
 HV7553.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7553.See file dsdata.pdf to determine how the superseded data were derived.
 HV7553
 HV7553_MARKER: DS = TRIANGULATION STATION DISK
 HV7553_SETTING: 0 = UNSPECIFIED SETTING
 HV7553_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7553
 HV7553  HISTORY     - Date     Condition        Report By
 HV7553  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7553  HISTORY     - 1971     GOOD             NGS
 HV7553
 HV7553                          STATION DESCRIPTION
 HV7553
 HV7553'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7553'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV7553'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. S.E. 160-A
 HV7553'GROUTED IN CONCRETE CURB.
 HV7553
 HV7553                          STATION RECOVERY (1971)
 HV7553
 HV7553'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7553'STATION RECOVERED AS DESCRIBED IN GOOD CONDITION.
 HV7553'
 HV7553'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7553'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7547 ***********************************************************************
 HV7547  DESIGNATION -  S E 160 B 1960
 HV7547  PID         -  HV7547
 HV7547  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7547  COUNTRY     -  US
 HV7547  USGS QUAD   -  ANACOSTIA (2016)
 HV7547
 HV7547                         *CURRENT SURVEY CONTROL
 HV7547  ______________________________________________________________________
 HV7547* NAD 83(1993) POSITION- 38 51 02.63868(N) 076 58 31.34744(W)   ADJUSTED
 HV7547* NAVD 88 ORTHO HEIGHT -    84.    (meters)      276.    (feet) SCALED
 HV7547  ______________________________________________________________________
 HV7547  GEOID HEIGHT    -        -32.247 (meters)                     GEOID18
 HV7547  LAPLACE CORR    -         -3.48  (seconds)                    DEFLEC18
 HV7547  HORZ ORDER      -  SECOND
 HV7547
 HV7547.The horizontal coordinates were established by classical geodetic methods
 HV7547.and adjusted by the National Geodetic Survey in November 1994.
 HV7547
 HV7547.The orthometric height was scaled from a topographic map.
 HV7547
 HV7547.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7547.GEOID18 height accuracy estimate available here.
 HV7547
 HV7547.Click photographs - Photos may exist for this station.
 HV7547
 HV7547.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7547
 HV7547. The following values were computed from the NAD 83(1993) position.
 HV7547
 HV7547;                    North         East     Units Scale Factor Converg.
 HV7547;SPC MD       -   131,436.578   402,137.605   MT  0.99994994   +0 00 55.6
 HV7547;SPC MD       -   431,221.51  1,319,346.46   sFT  0.99994994   +0 00 55.6
 HV7547;SPC VA N     - 2,132,530.032 3,632,338.069   MT  0.99995665   +0 57 05.6
 HV7547;SPC VA N     - 6,996,475.61 11,917,095.81   sFT  0.99995665   +0 57 05.6
 HV7547;UTM  18      - 4,302,066.508   328,582.752   MT  0.99996184   -1 14 22.0
 HV7547
 HV7547!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7547!SPC MD       -   0.99999192  x   0.99994994  =   0.99994186
 HV7547!SPC VA N     -   0.99999192  x   0.99995665  =   0.99994857
 HV7547!UTM  18      -   0.99999192  x   0.99996184  =   0.99995376
 HV7547
 HV7547:                Primary Azimuth Mark                     Grid Az
 HV7547:SPC MD       -  GARFIELD                                 074 54 29.0
 HV7547:SPC VA N     -  GARFIELD                                 073 58 19.0
 HV7547:UTM  18      -  GARFIELD                                 076 09 46.6
 HV7547
 HV7547_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2858202066(NAD 83)
 HV7547
 HV7547|---------------------------------------------------------------------|
 HV7547| PID    Reference Object                     Distance      Geod. Az  |
 HV7547|                                                           dddmmss.s |
 HV7547| HV7551 GARFIELD                            411.332 METERS 0745524.6 |
 HV7547| HV7549 S E 160 C 1960                      156.154 METERS 23638     |
 HV7547|---------------------------------------------------------------------|
 HV7547
 HV7547                          SUPERSEDED SURVEY CONTROL
 HV7547
 HV7547  NAD 83(1991)-  38 51 02.63714(N)    076 58 31.34820(W) AD(       ) 2
 HV7547  NAD 83(1986)-  38 51 02.63656(N)    076 58 31.35960(W) AD(       ) 2
 HV7547  NAD 27      -  38 51 02.23580(N)    076 58 32.45400(W) AD(       ) 2
 HV7547
 HV7547.Superseded values are not recommended for survey control.
 HV7547
 HV7547.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7547.See file dsdata.pdf to determine how the superseded data were derived.
 HV7547
 HV7547_MARKER: Z = SEE DESCRIPTION
 HV7547_SETTING: 0 = UNSPECIFIED SETTING
 HV7547_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7547
 HV7547  HISTORY     - Date     Condition        Report By
 HV7547  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7547  HISTORY     - 1971     SEE DESCRIPTION  NGS
 HV7547
 HV7547                          STATION DESCRIPTION
 HV7547
 HV7547'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7547'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7547
 HV7547                          STATION RECOVERY (1971)
 HV7547
 HV7547'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7547'STATION WAS DESTROYED WHEN NEW SIDEWALK WAS PUT IN.  THE REFERENCE
 HV7547'POINTS REMAIN, HOWEVER, THE CROSSES CUT IN THE RIMS OF MANHOLES
 HV7547'ARE WORN OFF.
 HV7547'
 HV7547'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7547'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7549 ***********************************************************************
 HV7549  DESIGNATION -  S E 160 C 1960
 HV7549  PID         -  HV7549
 HV7549  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7549  COUNTRY     -  US
 HV7549  USGS QUAD   -  ANACOSTIA (2016)
 HV7549
 HV7549                         *CURRENT SURVEY CONTROL
 HV7549  ______________________________________________________________________
 HV7549* NAD 83(1993) POSITION- 38 50 59.85335(N) 076 58 36.75565(W)   ADJUSTED
 HV7549* NAVD 88 ORTHO HEIGHT -    79.    (meters)      259.    (feet) SCALED
 HV7549  ______________________________________________________________________
 HV7549  GEOID HEIGHT    -        -32.246 (meters)                     GEOID18
 HV7549  LAPLACE CORR    -         -3.46  (seconds)                    DEFLEC18
 HV7549  HORZ ORDER      -  SECOND
 HV7549
 HV7549.The horizontal coordinates were established by classical geodetic methods
 HV7549.and adjusted by the National Geodetic Survey in November 1994.
 HV7549
 HV7549.The orthometric height was scaled from a topographic map.
 HV7549
 HV7549.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7549.GEOID18 height accuracy estimate available here.
 HV7549
 HV7549.Click photographs - Photos may exist for this station.
 HV7549
 HV7549.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7549
 HV7549. The following values were computed from the NAD 83(1993) position.
 HV7549
 HV7549;                    North         East     Units Scale Factor Converg.
 HV7549;SPC MD       -   131,350.657   402,007.223   MT  0.99994995   +0 00 52.2
 HV7549;SPC MD       -   430,939.61  1,318,918.70   sFT  0.99994995   +0 00 52.2
 HV7549;SPC VA N     - 2,132,441.992 3,632,209.107   MT  0.99995659   +0 57 02.2
 HV7549;SPC VA N     - 6,996,186.77 11,916,672.71   sFT  0.99995659   +0 57 02.2
 HV7549;UTM  18      - 4,301,983.463   328,450.518   MT  0.99996240   -1 14 25.3
 HV7549
 HV7549!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7549!SPC MD       -   0.99999270  x   0.99994995  =   0.99994265
 HV7549!SPC VA N     -   0.99999270  x   0.99995659  =   0.99994929
 HV7549!UTM  18      -   0.99999270  x   0.99996240  =   0.99995510
 HV7549
 HV7549_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2845001983(NAD 83)
 HV7549
 HV7549                          SUPERSEDED SURVEY CONTROL
 HV7549
 HV7549  NAD 83(1991)-  38 50 59.85179(N)    076 58 36.75643(W) AD(       ) 2
 HV7549  NAD 83(1986)-  38 50 59.85124(N)    076 58 36.76780(W) AD(       ) 2
 HV7549  NAD 27      -  38 50 59.45020(N)    076 58 37.86240(W) AD(       ) 2
 HV7549
 HV7549.Superseded values are not recommended for survey control.
 HV7549
 HV7549.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7549.See file dsdata.pdf to determine how the superseded data were derived.
 HV7549
 HV7549_MARKER: Z = SEE DESCRIPTION
 HV7549_SETTING: 0 = UNSPECIFIED SETTING
 HV7549_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7549
 HV7549  HISTORY     - Date     Condition        Report By
 HV7549  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7549  HISTORY     - 1971     GOOD             NGS
 HV7549
 HV7549                          STATION DESCRIPTION
 HV7549
 HV7549'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7549'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7549
 HV7549                          STATION RECOVERY (1971)
 HV7549
 HV7549'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7549'STATION WAS RECOVERED IN GOOD CONDITION.  ONE OF THE HOUSES
 HV7549'REFERENCED TO HAS BEEN REBUILT.  IT IS NOW NOS. 1900, 1902, AND
 HV7549'1904, THE DISTANCE TO STATION FROM THE NORTHEAST CORNER OF THIS
 HV7549'HOUSE IS 50.5 FEET.  IT IS 58.81 FEET SOUTHWEST OF THE SOUTHEAST
 HV7549'CORNER OF HOUSE NO. 1906, AS SHOWN ON SKETCH, AND 25.3 FEET
 HV7549'SOUTHWEST OF PEP POLE NO. 523038.  THE STATION IS AT BACK OF
 HV7549'CURB.
 HV7549'
 HV7549'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7549'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7548 ***********************************************************************
 HV7548  DESIGNATION -  S E 160 D 1960
 HV7548  PID         -  HV7548
 HV7548  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7548  COUNTRY     -  US
 HV7548  USGS QUAD   -  ANACOSTIA (2016)
 HV7548
 HV7548                         *CURRENT SURVEY CONTROL
 HV7548  ______________________________________________________________________
 HV7548* NAD 83(1993) POSITION- 38 50 51.96324(N) 076 58 43.05908(W)   ADJUSTED
 HV7548* NAVD 88 ORTHO HEIGHT -    62.    (meters)      203.    (feet) SCALED
 HV7548  ______________________________________________________________________
 HV7548  GEOID HEIGHT    -        -32.246 (meters)                     GEOID18
 HV7548  LAPLACE CORR    -         -3.45  (seconds)                    DEFLEC18
 HV7548  HORZ ORDER      -  SECOND
 HV7548
 HV7548.The horizontal coordinates were established by classical geodetic methods
 HV7548.and adjusted by the National Geodetic Survey in November 1994.
 HV7548
 HV7548.The orthometric height was scaled from a topographic map.
 HV7548
 HV7548.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7548.GEOID18 height accuracy estimate available here.
 HV7548
 HV7548.Click photographs - Photos may exist for this station.
 HV7548
 HV7548.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7548
 HV7548. The following values were computed from the NAD 83(1993) position.
 HV7548
 HV7548;                    North         East     Units Scale Factor Converg.
 HV7548;SPC MD       -   131,107.326   401,855.289   MT  0.99994997   +0 00 48.3
 HV7548;SPC MD       -   430,141.29  1,318,420.23   sFT  0.99994997   +0 00 48.3
 HV7548;SPC VA N     - 2,132,196.210 3,632,061.168   MT  0.99995644   +0 56 58.3
 HV7548;SPC VA N     - 6,995,380.40 11,916,187.35   sFT  0.99995644   +0 56 58.3
 HV7548;UTM  18      - 4,301,743.514   328,293.290   MT  0.99996306   -1 14 29.1
 HV7548
 HV7548!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7548!SPC MD       -   0.99999537  x   0.99994997  =   0.99994534
 HV7548!SPC VA N     -   0.99999537  x   0.99995644  =   0.99995181
 HV7548!UTM  18      -   0.99999537  x   0.99996306  =   0.99995843
 HV7548
 HV7548_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2829301743(NAD 83)
 HV7548
 HV7548                          SUPERSEDED SURVEY CONTROL
 HV7548
 HV7548  NAD 83(1991)-  38 50 51.96166(N)    076 58 43.05988(W) AD(       ) 2
 HV7548  NAD 83(1986)-  38 50 51.96114(N)    076 58 43.07125(W) AD(       ) 2
 HV7548  NAD 27      -  38 50 51.55980(N)    076 58 44.16580(W) AD(       ) 2
 HV7548
 HV7548.Superseded values are not recommended for survey control.
 HV7548
 HV7548.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7548.See file dsdata.pdf to determine how the superseded data were derived.
 HV7548
 HV7548_MARKER: Z = SEE DESCRIPTION
 HV7548_SETTING: 0 = UNSPECIFIED SETTING
 HV7548_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7548
 HV7548  HISTORY     - Date     Condition        Report By
 HV7548  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7548  HISTORY     - 1971     GOOD             NGS
 HV7548
 HV7548                          STATION DESCRIPTION
 HV7548
 HV7548'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7548'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7548
 HV7548                          STATION RECOVERY (1971)
 HV7548
 HV7548'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7548'STATION RECOVERED IN GOOD CONDITION.  THE CROSS CUT ON MANHOLE RIM
 HV7548'IS NOT IDENTIFIABLE.  ADDITIONAL NOTES FOLLOW--IT IS 94.5 FEET
 HV7548'NORTHEAST OF THE NORTHWEST CORNER OF BUILDING NO. 1811 AND 46.7
 HV7548'FEET EAST-NORTHEAST OF PEPCO POLE NO. 80 5369-9635)
 HV7548'
 HV7548'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7548'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7556 ***********************************************************************
 HV7556  DESIGNATION -  S E 161 A 1960
 HV7556  PID         -  HV7556
 HV7556  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7556  COUNTRY     -  US
 HV7556  USGS QUAD   -  ANACOSTIA (2016)
 HV7556
 HV7556                         *CURRENT SURVEY CONTROL
 HV7556  ______________________________________________________________________
 HV7556* NAD 83(1993) POSITION- 38 51 50.63616(N) 076 57 20.20164(W)   ADJUSTED
 HV7556* NAVD 88 ORTHO HEIGHT -    81.    (meters)      266.    (feet) SCALED
 HV7556  ______________________________________________________________________
 HV7556  GEOID HEIGHT    -        -32.263 (meters)                     GEOID18
 HV7556  LAPLACE CORR    -         -3.71  (seconds)                    DEFLEC18
 HV7556  HORZ ORDER      -  SECOND
 HV7556
 HV7556.The horizontal coordinates were established by classical geodetic methods
 HV7556.and adjusted by the National Geodetic Survey in November 1994.
 HV7556
 HV7556.The orthometric height was scaled from a topographic map.
 HV7556
 HV7556.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7556.GEOID18 height accuracy estimate available here.
 HV7556
 HV7556.Click photographs - Photos may exist for this station.
 HV7556
 HV7556.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7556
 HV7556. The following values were computed from the NAD 83(1993) position.
 HV7556
 HV7556;                    North         East     Units Scale Factor Converg.
 HV7556;SPC MD       -   132,917.244   403,852.364   MT  0.99994987   +0 01 40.3
 HV7556;SPC MD       -   436,079.32  1,324,972.30   sFT  0.99994987   +0 01 40.3
 HV7556;SPC VA N     - 2,134,038.525 3,634,028.423   MT  0.99995762   +0 57 50.0
 HV7556;SPC VA N     - 7,001,424.73 11,922,641.58   sFT  0.99995762   +0 57 50.0
 HV7556;UTM  18      - 4,303,509.272   330,329.546   MT  0.99995450   -1 13 38.6
 HV7556
 HV7556!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7556!SPC MD       -   0.99999239  x   0.99994987  =   0.99994226
 HV7556!SPC VA N     -   0.99999239  x   0.99995762  =   0.99995001
 HV7556!UTM  18      -   0.99999239  x   0.99995450  =   0.99994689
 HV7556
 HV7556:                Primary Azimuth Mark                     Grid Az
 HV7556:SPC MD       -  SE 161                                   066 36 18.9
 HV7556:SPC VA N     -  SE 161                                   065 40 09.2
 HV7556:UTM  18      -  SE 161                                   067 51 37.8
 HV7556
 HV7556_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3032903509(NAD 83)
 HV7556
 HV7556|---------------------------------------------------------------------|
 HV7556| PID    Reference Object                     Distance      Geod. Az  |
 HV7556|                                                           dddmmss.s |
 HV7556| HV1453 SE 161                              430.348 METERS 0663759.2 |
 HV7556| HV7555 S E 161 B 1960                      180.146 METERS 20927     |
 HV7556|---------------------------------------------------------------------|
 HV7556
 HV7556                          SUPERSEDED SURVEY CONTROL
 HV7556
 HV7556  NAD 83(1991)-  38 51 50.63468(N)    076 57 20.20248(W) AD(       ) 2
 HV7556  NAD 83(1986)-  38 51 50.63391(N)    076 57 20.21368(W) AD(       ) 2
 HV7556  NAD 27      -  38 51 50.23440(N)    076 57 21.30380(W) AD(       ) 2
 HV7556
 HV7556.Superseded values are not recommended for survey control.
 HV7556
 HV7556.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7556.See file dsdata.pdf to determine how the superseded data were derived.
 HV7556
 HV7556_MARKER: Z = SEE DESCRIPTION
 HV7556_SETTING: 0 = UNSPECIFIED SETTING
 HV7556_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7556
 HV7556  HISTORY     - Date     Condition        Report By
 HV7556  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7556  HISTORY     - 1971     GOOD             NGS
 HV7556
 HV7556                          STATION DESCRIPTION
 HV7556
 HV7556'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7556'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7556
 HV7556                          STATION RECOVERY (1971)
 HV7556
 HV7556'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7556'STATION AND REFERENCE POINTS RECOVERED AS DESCRIBED IN GOOD
 HV7556'CONDITION.
 HV7556'
 HV7556'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7556'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7555 ***********************************************************************
 HV7555  DESIGNATION -  S E 161 B 1960
 HV7555  PID         -  HV7555
 HV7555  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7555  COUNTRY     -  US
 HV7555  USGS QUAD   -  ANACOSTIA (2016)
 HV7555
 HV7555                         *CURRENT SURVEY CONTROL
 HV7555  ______________________________________________________________________
 HV7555* NAD 83(1993) POSITION- 38 51 45.54895(N) 076 57 23.87501(W)   ADJUSTED
 HV7555* NAVD 88 ORTHO HEIGHT -    87.    (meters)      285.    (feet) SCALED
 HV7555  ______________________________________________________________________
 HV7555  GEOID HEIGHT    -        -32.263 (meters)                     GEOID18
 HV7555  LAPLACE CORR    -         -3.68  (seconds)                    DEFLEC18
 HV7555  HORZ ORDER      -  SECOND
 HV7555
 HV7555.The horizontal coordinates were established by classical geodetic methods
 HV7555.and adjusted by the National Geodetic Survey in November 1994.
 HV7555
 HV7555.The orthometric height was scaled from a topographic map.
 HV7555
 HV7555.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7555.GEOID18 height accuracy estimate available here.
 HV7555
 HV7555.Click photographs - Photos may exist for this station.
 HV7555
 HV7555.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7555
 HV7555. The following values were computed from the NAD 83(1993) position.
 HV7555
 HV7555;                    North         East     Units Scale Factor Converg.
 HV7555;SPC MD       -   132,760.336   403,763.882   MT  0.99994987   +0 01 38.0
 HV7555;SPC MD       -   435,564.54  1,324,682.00   sFT  0.99994987   +0 01 38.0
 HV7555;SPC VA N     - 2,133,880.191 3,633,942.515   MT  0.99995751   +0 57 47.7
 HV7555;SPC VA N     - 7,000,905.26 11,922,359.73   sFT  0.99995751   +0 57 47.7
 HV7555;UTM  18      - 4,303,354.339   330,237.648   MT  0.99995489   -1 13 40.8
 HV7555
 HV7555!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7555!SPC MD       -   0.99999145  x   0.99994987  =   0.99994132
 HV7555!SPC VA N     -   0.99999145  x   0.99995751  =   0.99994896
 HV7555!UTM  18      -   0.99999145  x   0.99995489  =   0.99994634
 HV7555
 HV7555_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3023703354(NAD 83)
 HV7555
 HV7555                          SUPERSEDED SURVEY CONTROL
 HV7555
 HV7555  NAD 83(1991)-  38 51 45.54746(N)    076 57 23.87585(W) AD(       ) 2
 HV7555  NAD 83(1986)-  38 51 45.54671(N)    076 57 23.88707(W) AD(       ) 2
 HV7555  NAD 27      -  38 51 45.14720(N)    076 57 24.97730(W) AD(       ) 2
 HV7555
 HV7555.Superseded values are not recommended for survey control.
 HV7555
 HV7555.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7555.See file dsdata.pdf to determine how the superseded data were derived.
 HV7555
 HV7555_MARKER: Z = SEE DESCRIPTION
 HV7555_SETTING: 0 = UNSPECIFIED SETTING
 HV7555_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7555
 HV7555  HISTORY     - Date     Condition        Report By
 HV7555  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7555  HISTORY     - 1971     GOOD             NGS
 HV7555
 HV7555                          STATION DESCRIPTION
 HV7555
 HV7555'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7555'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7555
 HV7555                          STATION RECOVERY (1971)
 HV7555
 HV7555'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7555'STATION WAS NOT RECOVERED.  A NEW WALK HAS BEEN PUT IN OVER THE
 HV7555'STATION SITE.  THE MANHOLES REFERENCED TO REMAIN, HOWEVER, THE
 HV7555'CHISELED CROSSES HAVE BEEN WORN OFF BY TRAFFIC.
 HV7555'
 HV7555'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7555'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7554 ***********************************************************************
 HV7554  DESIGNATION -  S E 161 C 1960
 HV7554  PID         -  HV7554
 HV7554  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7554  COUNTRY     -  US
 HV7554  USGS QUAD   -  ANACOSTIA (2016)
 HV7554
 HV7554                         *CURRENT SURVEY CONTROL
 HV7554  ______________________________________________________________________
 HV7554* NAD 83(1993) POSITION- 38 51 42.90104(N) 076 57 31.10789(W)   ADJUSTED
 HV7554* NAVD 88 ORTHO HEIGHT -    88.    (meters)      289.    (feet) SCALED
 HV7554  ______________________________________________________________________
 HV7554  GEOID HEIGHT    -        -32.260 (meters)                     GEOID18
 HV7554  LAPLACE CORR    -         -3.61  (seconds)                    DEFLEC18
 HV7554  HORZ ORDER      -  SECOND
 HV7554
 HV7554.The horizontal coordinates were established by classical geodetic methods
 HV7554.and adjusted by the National Geodetic Survey in November 1994.
 HV7554
 HV7554.The orthometric height was scaled from a topographic map.
 HV7554
 HV7554.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7554.GEOID18 height accuracy estimate available here.
 HV7554
 HV7554.Click photographs - Photos may exist for this station.
 HV7554
 HV7554.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7554
 HV7554. The following values were computed from the NAD 83(1993) position.
 HV7554
 HV7554;                    North         East     Units Scale Factor Converg.
 HV7554;SPC MD       -   132,678.605   403,589.548   MT  0.99994988   +0 01 33.4
 HV7554;SPC MD       -   435,296.39  1,324,110.04   sFT  0.99994988   +0 01 33.4
 HV7554;SPC VA N     - 2,133,795.623 3,633,769.538   MT  0.99995746   +0 57 43.2
 HV7554;SPC VA N     - 7,000,627.81 11,921,792.23   sFT  0.99995746   +0 57 43.2
 HV7554;UTM  18      - 4,303,276.447   330,061.564   MT  0.99995562   -1 13 45.2
 HV7554
 HV7554!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7554!SPC MD       -   0.99999129  x   0.99994988  =   0.99994117
 HV7554!SPC VA N     -   0.99999129  x   0.99995746  =   0.99994875
 HV7554!UTM  18      -   0.99999129  x   0.99995562  =   0.99994691
 HV7554
 HV7554_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3006103276(NAD 83)
 HV7554
 HV7554|---------------------------------------------------------------------|
 HV7554| PID    Reference Object                     Distance      Geod. Az  |
 HV7554|                                                           dddmmss.s |
 HV7554| HV7555 S E 161 B 1960                      192.551 METERS 06454     |
 HV7554| HV7546 S E 161 D 1960                      329.143 METERS 26500     |
 HV7554|---------------------------------------------------------------------|
 HV7554
 HV7554                          SUPERSEDED SURVEY CONTROL
 HV7554
 HV7554  NAD 83(1991)-  38 51 42.89955(N)    076 57 31.10870(W) AD(       ) 2
 HV7554  NAD 83(1986)-  38 51 42.89881(N)    076 57 31.11996(W) AD(       ) 2
 HV7554  NAD 27      -  38 51 42.49920(N)    076 57 32.21050(W) AD(       ) 2
 HV7554
 HV7554.Superseded values are not recommended for survey control.
 HV7554
 HV7554.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7554.See file dsdata.pdf to determine how the superseded data were derived.
 HV7554
 HV7554_MARKER: Z = SEE DESCRIPTION
 HV7554_SETTING: 0 = UNSPECIFIED SETTING
 HV7554_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7554
 HV7554  HISTORY     - Date     Condition        Report By
 HV7554  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7554  HISTORY     - 1971     GOOD             NGS
 HV7554
 HV7554                          STATION DESCRIPTION
 HV7554
 HV7554'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7554'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7554
 HV7554                          STATION RECOVERY (1971)
 HV7554
 HV7554'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7554'THE STATION AND REFERENCE POINTS RECOVERED AS DESCRIBED.
 HV7554'
 HV7554'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7554'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7546 ***********************************************************************
 HV7546  DESIGNATION -  S E 161 D 1960
 HV7546  PID         -  HV7546
 HV7546  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7546  COUNTRY     -  US
 HV7546  USGS QUAD   -  ANACOSTIA (2016)
 HV7546
 HV7546                         *CURRENT SURVEY CONTROL
 HV7546  ______________________________________________________________________
 HV7546* NAD 83(1993) POSITION- 38 51 41.97163(N) 076 57 44.70795(W)   ADJUSTED
 HV7546* NAVD 88 ORTHO HEIGHT -    90.    (meters)      295.    (feet) SCALED
 HV7546  ______________________________________________________________________
 HV7546  GEOID HEIGHT    -        -32.254 (meters)                     GEOID18
 HV7546  LAPLACE CORR    -         -3.48  (seconds)                    DEFLEC18
 HV7546  HORZ ORDER      -  SECOND
 HV7546
 HV7546.The horizontal coordinates were established by classical geodetic methods
 HV7546.and adjusted by the National Geodetic Survey in November 1994.
 HV7546
 HV7546.The orthometric height was scaled from a topographic map.
 HV7546
 HV7546.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7546.GEOID18 height accuracy estimate available here.
 HV7546
 HV7546.Click photographs - Photos may exist for this station.
 HV7546
 HV7546.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7546
 HV7546. The following values were computed from the NAD 83(1993) position.
 HV7546
 HV7546;                    North         East     Units Scale Factor Converg.
 HV7546;SPC MD       -   132,649.805   403,261.684   MT  0.99994988   +0 01 24.9
 HV7546;SPC MD       -   435,201.90  1,323,034.37   sFT  0.99994988   +0 01 24.9
 HV7546;SPC VA N     - 2,133,761.470 3,633,442.186   MT  0.99995744   +0 57 34.7
 HV7546;SPC VA N     - 7,000,515.76 11,920,718.24   sFT  0.99995744   +0 57 34.7
 HV7546;UTM  18      - 4,303,254.835   329,733.146   MT  0.99995700   -1 13 53.8
 HV7546
 HV7546!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7546!SPC MD       -   0.99999098  x   0.99994988  =   0.99994086
 HV7546!SPC VA N     -   0.99999098  x   0.99995744  =   0.99994842
 HV7546!UTM  18      -   0.99999098  x   0.99995700  =   0.99994798
 HV7546
 HV7546:                Primary Azimuth Mark                     Grid Az
 HV7546:SPC MD       -  SE 160                                   245 39 07.3
 HV7546:SPC VA N     -  SE 160                                   244 42 57.5
 HV7546:UTM  18      -  SE 160                                   246 54 26.0
 HV7546
 HV7546_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2973303254(NAD 83)
 HV7546
 HV7546|---------------------------------------------------------------------|
 HV7546| PID    Reference Object                     Distance      Geod. Az  |
 HV7546|                                                           dddmmss.s |
 HV7546| HV7554 S E 161 C 1960                      329.143 METERS 08500     |
 HV7546| HV1454 SE 160                              460.832 METERS 2454032.2 |
 HV7546|---------------------------------------------------------------------|
 HV7546
 HV7546                          SUPERSEDED SURVEY CONTROL
 HV7546
 HV7546  NAD 83(1991)-  38 51 41.97013(N)    076 57 44.70872(W) AD(       ) 2
 HV7546  NAD 83(1986)-  38 51 41.96942(N)    076 57 44.72001(W) AD(       ) 2
 HV7546  NAD 27      -  38 51 41.56980(N)    076 57 45.81140(W) AD(       ) 2
 HV7546
 HV7546.Superseded values are not recommended for survey control.
 HV7546
 HV7546.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7546.See file dsdata.pdf to determine how the superseded data were derived.
 HV7546
 HV7546_MARKER: Z = SEE DESCRIPTION
 HV7546_SETTING: 0 = UNSPECIFIED SETTING
 HV7546_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7546
 HV7546  HISTORY     - Date     Condition        Report By
 HV7546  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7546  HISTORY     - 1971     GOOD             NGS
 HV7546
 HV7546                          STATION DESCRIPTION
 HV7546
 HV7546'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7546'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7546
 HV7546                          STATION RECOVERY (1971)
 HV7546
 HV7546'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7546'STATION RECOVERED AS DESCRIBED IN GOOD CONDITION.  THE CROSS CUT
 HV7546'ON MAN HOLE RIM IN SIDEWALK STILL REMAINS, THE CROSS ON MAN HOLE
 HV7546'RIM IN STREET HAS BEEN WORN OFF.
 HV7546'
 HV7546'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7546'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7582 ***********************************************************************
 HV7582  DESIGNATION -  S E 162 A
 HV7582  PID         -  HV7582
 HV7582  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7582  COUNTRY     -  US
 HV7582  USGS QUAD   -  ANACOSTIA (2016)
 HV7582
 HV7582                         *CURRENT SURVEY CONTROL
 HV7582  ______________________________________________________________________
 HV7582* NAD 83(1993) POSITION- 38 52 17.58275(N) 076 56 22.24693(W)   ADJUSTED
 HV7582* NAVD 88 ORTHO HEIGHT -    91.    (meters)      299.    (feet) SCALED
 HV7582  ______________________________________________________________________
 HV7582  GEOID HEIGHT    -        -32.286 (meters)                     GEOID18
 HV7582  LAPLACE CORR    -         -4.29  (seconds)                    DEFLEC18
 HV7582  HORZ ORDER      -  SECOND
 HV7582
 HV7582.The horizontal coordinates were established by classical geodetic methods
 HV7582.and adjusted by the National Geodetic Survey in November 1994.
 HV7582
 HV7582.The orthometric height was scaled from a topographic map.
 HV7582
 HV7582.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7582.GEOID18 height accuracy estimate available here.
 HV7582
 HV7582.Click photographs - Photos may exist for this station.
 HV7582
 HV7582.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7582
 HV7582. The following values were computed from the NAD 83(1993) position.
 HV7582
 HV7582;                    North         East     Units Scale Factor Converg.
 HV7582;SPC MD       -   133,748.955   405,248.965   MT  0.99994985   +0 02 16.7
 HV7582;SPC MD       -   438,808.03  1,329,554.31   sFT  0.99994985   +0 02 16.7
 HV7582;SPC VA N     - 2,134,892.946 3,635,411.262   MT  0.99995819   +0 58 26.1
 HV7582;SPC VA N     - 7,004,227.94 11,927,178.45   sFT  0.99995819   +0 58 26.1
 HV7582;UTM  18      - 4,304,310.188   331,744.036   MT  0.99994861   -1 13 02.9
 HV7582
 HV7582!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7582!SPC MD       -   0.99999083  x   0.99994985  =   0.99994068
 HV7582!SPC VA N     -   0.99999083  x   0.99995819  =   0.99994902
 HV7582!UTM  18      -   0.99999083  x   0.99994861  =   0.99993944
 HV7582
 HV7582_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3174404310(NAD 83)
 HV7582
 HV7582|---------------------------------------------------------------------|
 HV7582| PID    Reference Object                     Distance      Geod. Az  |
 HV7582|                                                           dddmmss.s |
 HV7582| HV1478 SE 162 RESET                        363.311 METERS 05630     |
 HV7582|---------------------------------------------------------------------|
 HV7582
 HV7582                          SUPERSEDED SURVEY CONTROL
 HV7582
 HV7582  NAD 83(1991)-  38 52 17.58131(N)    076 56 22.24787(W) AD(       ) 2
 HV7582  NAD 83(1986)-  38 52 17.58038(N)    076 56 22.25891(W) AD(       ) 2
 HV7582  NAD 27      -  38 52 17.18130(N)    076 56 23.34780(W) AD(       ) 2
 HV7582
 HV7582.Superseded values are not recommended for survey control.
 HV7582
 HV7582.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7582.See file dsdata.pdf to determine how the superseded data were derived.
 HV7582
 HV7582
 HV7582  HISTORY     - Date     Condition        Report By
 HV7582  HISTORY     - 1960     FIRST OBSERVED   MADHOP
 HV7582  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7582
 HV7582                          STATION DESCRIPTION
 HV7582
 HV7582'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7582'THE STATION WAS NOT RECOVERED, HOWEVER, IT WAS NOT STATED IN THE
 HV7582'DESCRIPTION AS TO HOW THE STATION WAS MARKED.  IT APPEARS TO BE A NEW
 HV7582'CURB AT LOCATION FOR STATION.  ALL THREE REFERENCE POINTS WERE
 HV7582'RECOVERED AS DESCRIBED.
 HV7582'
 HV7582'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7580 ***********************************************************************
 HV7580  DESIGNATION -  S E 162 B 1960
 HV7580  PID         -  HV7580
 HV7580  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7580  COUNTRY     -  US
 HV7580  USGS QUAD   -  ANACOSTIA (2016)
 HV7580
 HV7580                         *CURRENT SURVEY CONTROL
 HV7580  ______________________________________________________________________
 HV7580* NAD 83(1993) POSITION- 38 52 12.95519(N) 076 56 46.09954(W)   ADJUSTED
 HV7580* NAVD 88 ORTHO HEIGHT -    91.    (meters)      299.    (feet) SCALED
 HV7580  ______________________________________________________________________
 HV7580  GEOID HEIGHT    -        -32.273 (meters)                     GEOID18
 HV7580  LAPLACE CORR    -         -4.04  (seconds)                    DEFLEC18
 HV7580  HORZ ORDER      -  SECOND
 HV7580
 HV7580.The horizontal coordinates were established by classical geodetic methods
 HV7580.and adjusted by the National Geodetic Survey in November 1994.
 HV7580
 HV7580.The orthometric height was scaled from a topographic map.
 HV7580
 HV7580.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7580.GEOID18 height accuracy estimate available here.
 HV7580
 HV7580.Click photographs - Photos may exist for this station.
 HV7580
 HV7580.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7580
 HV7580. The following values were computed from the NAD 83(1993) position.
 HV7580
 HV7580;                    North         East     Units Scale Factor Converg.
 HV7580;SPC MD       -   133,605.902   404,674.079   MT  0.99994985   +0 02 01.7
 HV7580;SPC MD       -   438,338.70  1,327,668.21   sFT  0.99994985   +0 02 01.7
 HV7580;SPC VA N     - 2,134,740.520 3,634,838.785   MT  0.99995809   +0 58 11.3
 HV7580;SPC VA N     - 7,003,727.86 11,925,300.25   sFT  0.99995809   +0 58 11.3
 HV7580;UTM  18      - 4,304,179.765   331,166.154   MT  0.99995101   -1 13 17.8
 HV7580
 HV7580!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7580!SPC MD       -   0.99999082  x   0.99994985  =   0.99994067
 HV7580!SPC VA N     -   0.99999082  x   0.99995809  =   0.99994891
 HV7580!UTM  18      -   0.99999082  x   0.99995101  =   0.99994183
 HV7580
 HV7580:                Primary Azimuth Mark                     Grid Az
 HV7580:SPC MD       -  S E 162 A                                076 01 35.4
 HV7580:SPC VA N     -  S E 162 A                                075 05 25.8
 HV7580:UTM  18      -  S E 162 A                                077 16 54.9
 HV7580
 HV7580_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3116604179(NAD 83)
 HV7580
 HV7580|---------------------------------------------------------------------|
 HV7580| PID    Reference Object                     Distance      Geod. Az  |
 HV7580|                                                           dddmmss.s |
 HV7580| HV7582 S E 162 A                           APPROX. 0.6 KM 0760337.1 |
 HV7580| HV7579 S E 162 C 1960                      336.046 METERS 22532     |
 HV7580|---------------------------------------------------------------------|
 HV7580
 HV7580                          SUPERSEDED SURVEY CONTROL
 HV7580
 HV7580  NAD 83(1991)-  38 52 12.95374(N)    076 56 46.10044(W) AD(       ) 2
 HV7580  NAD 83(1986)-  38 52 12.95287(N)    076 56 46.11153(W) AD(       ) 2
 HV7580  NAD 27      -  38 52 12.55380(N)    076 56 47.19970(W) AD(       ) 2
 HV7580
 HV7580.Superseded values are not recommended for survey control.
 HV7580
 HV7580.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7580.See file dsdata.pdf to determine how the superseded data were derived.
 HV7580
 HV7580_MARKER: Z = SEE DESCRIPTION
 HV7580_SETTING: 0 = UNSPECIFIED SETTING
 HV7580_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7580
 HV7580  HISTORY     - Date     Condition        Report By
 HV7580  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7580  HISTORY     - 1971     SEE DESCRIPTION  NGS
 HV7580
 HV7580                          STATION DESCRIPTION
 HV7580
 HV7580'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7580'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7580
 HV7580                          STATION RECOVERY (1971)
 HV7580
 HV7580'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7580'STATION WAS NOT RECOVERED.  THE SIDEWALK REFERENCED TO HAS BEEN
 HV7580'TAKEN UP AND A NEW CONCRETE DRIVEWAY PUT IN WHERE GRAVEL
 HV7580'DRIVEWAY WAS SHOWN ON SKETCH.
 HV7580'
 HV7580'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7580'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7579 ***********************************************************************
 HV7579  DESIGNATION -  S E 162 C 1960
 HV7579  PID         -  HV7579
 HV7579  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7579  COUNTRY     -  US
 HV7579  USGS QUAD   -  ANACOSTIA (2016)
 HV7579
 HV7579                         *CURRENT SURVEY CONTROL
 HV7579  ______________________________________________________________________
 HV7579* NAD 83(1993) POSITION- 38 52 05.32177(N) 076 56 56.04802(W)   ADJUSTED
 HV7579* NAVD 88 ORTHO HEIGHT -    90.    (meters)      295.    (feet) SCALED
 HV7579  ______________________________________________________________________
 HV7579  GEOID HEIGHT    -        -32.270 (meters)                     GEOID18
 HV7579  LAPLACE CORR    -         -3.95  (seconds)                    DEFLEC18
 HV7579  HORZ ORDER      -  SECOND
 HV7579
 HV7579.The horizontal coordinates were established by classical geodetic methods
 HV7579.and adjusted by the National Geodetic Survey in November 1994.
 HV7579
 HV7579.The orthometric height was scaled from a topographic map.
 HV7579
 HV7579.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7579.GEOID18 height accuracy estimate available here.
 HV7579
 HV7579.Click photographs - Photos may exist for this station.
 HV7579
 HV7579.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7579
 HV7579. The following values were computed from the NAD 83(1993) position.
 HV7579
 HV7579;                    North         East     Units Scale Factor Converg.
 HV7579;SPC MD       -   133,370.385   404,434.397   MT  0.99994986   +0 01 55.5
 HV7579;SPC MD       -   437,566.00  1,326,881.85   sFT  0.99994986   +0 01 55.5
 HV7579;SPC VA N     - 2,134,501.117 3,634,602.981   MT  0.99995793   +0 58 05.0
 HV7579;SPC VA N     - 7,002,942.41 11,924,526.61   sFT  0.99995793   +0 58 05.0
 HV7579;UTM  18      - 4,303,949.555   330,921.369   MT  0.99995203   -1 13 23.8
 HV7579
 HV7579!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7579!SPC MD       -   0.99999098  x   0.99994986  =   0.99994084
 HV7579!SPC VA N     -   0.99999098  x   0.99995793  =   0.99994891
 HV7579!UTM  18      -   0.99999098  x   0.99995203  =   0.99994301
 HV7579
 HV7579_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3092103949(NAD 83)
 HV7579
 HV7579|---------------------------------------------------------------------|
 HV7579| PID    Reference Object                     Distance      Geod. Az  |
 HV7579|                                                           dddmmss.s |
 HV7579| HV7580 S E 162 B 1960                      336.046 METERS 04532     |
 HV7579| HV7578 S E 162 D 1960                      202.758 METERS 21023     |
 HV7579|---------------------------------------------------------------------|
 HV7579
 HV7579                          SUPERSEDED SURVEY CONTROL
 HV7579
 HV7579  NAD 83(1991)-  38 52 05.32031(N)    076 56 56.04891(W) AD(       ) 2
 HV7579  NAD 83(1986)-  38 52 05.31947(N)    076 56 56.06003(W) AD(       ) 2
 HV7579  NAD 27      -  38 52 04.92000(N)    076 56 57.14890(W) AD(       ) 2
 HV7579
 HV7579.Superseded values are not recommended for survey control.
 HV7579
 HV7579.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7579.See file dsdata.pdf to determine how the superseded data were derived.
 HV7579
 HV7579_MARKER: Z = SEE DESCRIPTION
 HV7579_SETTING: 0 = UNSPECIFIED SETTING
 HV7579_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7579
 HV7579  HISTORY     - Date     Condition        Report By
 HV7579  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7579  HISTORY     - 1971     GOOD             NGS
 HV7579
 HV7579                          STATION DESCRIPTION
 HV7579
 HV7579'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7579'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7579
 HV7579                          STATION RECOVERY (1971)
 HV7579
 HV7579'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7579'STATION AND REFERENCE POINTS RECOVERED AS DESCRIBED AND ARE IN
 HV7579'GOOD CONDITION.
 HV7579'
 HV7579'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7579'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7578 ***********************************************************************
 HV7578  DESIGNATION -  S E 162 D 1960
 HV7578  PID         -  HV7578
 HV7578  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7578  COUNTRY     -  US
 HV7578  USGS QUAD   -  ANACOSTIA (2016)
 HV7578
 HV7578                         *CURRENT SURVEY CONTROL
 HV7578  ______________________________________________________________________
 HV7578* NAD 83(1993) POSITION- 38 51 59.64992(N) 076 57 00.30252(W)   ADJUSTED
 HV7578* NAVD 88 ORTHO HEIGHT -    90.    (meters)      295.    (feet) SCALED
 HV7578  ______________________________________________________________________
 HV7578  GEOID HEIGHT    -        -32.270 (meters)                     GEOID18
 HV7578  LAPLACE CORR    -         -3.91  (seconds)                    DEFLEC18
 HV7578  HORZ ORDER      -  SECOND
 HV7578
 HV7578.The horizontal coordinates were established by classical geodetic methods
 HV7578.and adjusted by the National Geodetic Survey in November 1994.
 HV7578
 HV7578.The orthometric height was scaled from a topographic map.
 HV7578
 HV7578.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7578.GEOID18 height accuracy estimate available here.
 HV7578
 HV7578.Click photographs - Photos may exist for this station.
 HV7578
 HV7578.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7578
 HV7578. The following values were computed from the NAD 83(1993) position.
 HV7578
 HV7578;                    North         East     Units Scale Factor Converg.
 HV7578;SPC MD       -   133,195.435   404,331.933   MT  0.99994986   +0 01 52.8
 HV7578;SPC MD       -   436,992.02  1,326,545.68   sFT  0.99994986   +0 01 52.8
 HV7578;SPC VA N     - 2,134,324.515 3,634,503.387   MT  0.99995781   +0 58 02.4
 HV7578;SPC VA N     - 7,002,363.01 11,924,199.86   sFT  0.99995781   +0 58 02.4
 HV7578;UTM  18      - 4,303,776.891   330,815.096   MT  0.99995247   -1 13 26.3
 HV7578
 HV7578!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7578!SPC MD       -   0.99999098  x   0.99994986  =   0.99994084
 HV7578!SPC VA N     -   0.99999098  x   0.99995781  =   0.99994879
 HV7578!UTM  18      -   0.99999098  x   0.99995247  =   0.99994345
 HV7578
 HV7578_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3081503776(NAD 83)
 HV7578
 HV7578                          SUPERSEDED SURVEY CONTROL
 HV7578
 HV7578  NAD 83(1991)-  38 51 59.64845(N)    076 57 00.30340(W) AD(       ) 2
 HV7578  NAD 83(1986)-  38 51 59.64763(N)    076 57 00.31454(W) AD(       ) 2
 HV7578  NAD 27      -  38 51 59.24810(N)    076 57 01.40370(W) AD(       ) 2
 HV7578
 HV7578.Superseded values are not recommended for survey control.
 HV7578
 HV7578.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7578.See file dsdata.pdf to determine how the superseded data were derived.
 HV7578
 HV7578_MARKER: Z = SEE DESCRIPTION
 HV7578_SETTING: 0 = UNSPECIFIED SETTING
 HV7578_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7578
 HV7578  HISTORY     - Date     Condition        Report By
 HV7578  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7578  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7578
 HV7578                          STATION DESCRIPTION
 HV7578
 HV7578'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7578'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7578
 HV7578                          STATION RECOVERY (1971)
 HV7578
 HV7578'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7578'STATION WAS NOT RECOVERED AND IS PROBABLY DESTROYED.  HOWEVER,
 HV7578'THE REFERENCE POINTS WERE ALL RECOVERED IN GOOD CONDITION AND
 HV7578'THE STATIONS POSITION CAN BE RE-DETERMINED FROM THEIR MEASUREMENTS
 HV7578'GIVEN IN SKETCH.
 HV7578'
 HV7578'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7578'DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7569 ***********************************************************************
 HV7569  DESIGNATION -  S E 164 1960
 HV7569  PID         -  HV7569
 HV7569  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7569  COUNTRY     -  US
 HV7569  USGS QUAD   -  ANACOSTIA (2016)
 HV7569
 HV7569                         *CURRENT SURVEY CONTROL
 HV7569  ______________________________________________________________________
 HV7569* NAD 83(1993) POSITION- 38 50 36.92965(N) 076 59 39.54525(W)   ADJUSTED
 HV7569* NAVD 88 ORTHO HEIGHT -    53.    (meters)      174.    (feet) SCALED
 HV7569  ______________________________________________________________________
 HV7569  GEOID HEIGHT    -        -32.227 (meters)                     GEOID18
 HV7569  LAPLACE CORR    -         -2.93  (seconds)                    DEFLEC18
 HV7569  HORZ ORDER      -  SECOND
 HV7569
 HV7569.The horizontal coordinates were established by classical geodetic methods
 HV7569.and adjusted by the National Geodetic Survey in November 1994.
 HV7569
 HV7569.The orthometric height was scaled from a topographic map.
 HV7569
 HV7569.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7569.GEOID18 height accuracy estimate available here.
 HV7569
 HV7569.Click photographs - Photos may exist for this station.
 HV7569
 HV7569.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7569
 HV7569. The following values were computed from the NAD 83(1993) position.
 HV7569
 HV7569;                    North         East     Units Scale Factor Converg.
 HV7569;SPC MD       -   130,643.559   400,493.258   MT  0.99995001   +0 00 12.8
 HV7569;SPC MD       -   428,619.74  1,313,951.63   sFT  0.99995001   +0 00 12.8
 HV7569;SPC VA N     - 2,131,710.250 3,630,706.887   MT  0.99995615   +0 56 23.0
 HV7569;SPC VA N     - 6,993,786.05 11,911,744.18   sFT  0.99995615   +0 56 23.0
 HV7569;UTM  18      - 4,301,309.678   326,921.408   MT  0.99996889   -1 15 04.1
 HV7569
 HV7569!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7569!SPC MD       -   0.99999678  x   0.99995001  =   0.99994679
 HV7569!SPC VA N     -   0.99999678  x   0.99995615  =   0.99995293
 HV7569!UTM  18      -   0.99999678  x   0.99996889  =   0.99996567
 HV7569
 HV7569:                Primary Azimuth Mark                     Grid Az
 HV7569:SPC MD       -  S E 165 A 1960                           077 35 54.9
 HV7569:SPC VA N     -  S E 165 A 1960                           076 39 44.7
 HV7569:UTM  18      -  S E 165 A 1960                           078 51 11.8
 HV7569
 HV7569_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2692101309(NAD 83)
 HV7569
 HV7569|---------------------------------------------------------------------|
 HV7569| PID    Reference Object                     Distance      Geod. Az  |
 HV7569|                                                           dddmmss.s |
 HV7569| HV1456 SE 164 RESET                         22.864 METERS 07514     |
 HV7569| HV7562 S E 165 A 1960                      APPROX. 0.5 KM 0773607.7 |
 HV7569| HV7571 S E 164 A 1960                      177.482 METERS 17128     |
 HV7569|---------------------------------------------------------------------|
 HV7569
 HV7569                          SUPERSEDED SURVEY CONTROL
 HV7569
 HV7569  NAD 83(1991)-  38 50 36.92804(N)    076 59 39.54613(W) AD(       ) 2
 HV7569  NAD 83(1986)-  38 50 36.92762(N)    076 59 39.55742(W) AD(       ) 2
 HV7569  NAD 27      -  38 50 36.52540(N)    076 59 40.65010(W) AD(       ) 2
 HV7569
 HV7569.Superseded values are not recommended for survey control.
 HV7569
 HV7569.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7569.See file dsdata.pdf to determine how the superseded data were derived.
 HV7569
 HV7569_MARKER: DS = TRIANGULATION STATION DISK
 HV7569_SETTING: 0 = UNSPECIFIED SETTING
 HV7569_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7569
 HV7569  HISTORY     - Date     Condition        Report By
 HV7569  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7569  HISTORY     - 1971     GOOD             NGS
 HV7569
 HV7569                          STATION DESCRIPTION
 HV7569
 HV7569'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7569'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV7569'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO S.E. 164 SET
 HV7569'IN CONCRETE WALK.
 HV7569
 HV7569                          STATION RECOVERY (1971)
 HV7569
 HV7569'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7569'THIS STATION WAS RECOVERED IN GOOD CONDITION AND IS STILL IN
 HV7569'POSITION.
 HV7569'
 HV7569'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7569'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7571 ***********************************************************************
 HV7571  DESIGNATION -  S E 164 A 1960
 HV7571  PID         -  HV7571
 HV7571  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7571  COUNTRY     -  US
 HV7571  USGS QUAD   -  ANACOSTIA (2016)
 HV7571
 HV7571                         *CURRENT SURVEY CONTROL
 HV7571  ______________________________________________________________________
 HV7571* NAD 83(1993) POSITION- 38 50 31.23771(N) 076 59 38.45428(W)   ADJUSTED
 HV7571* NAVD 88 ORTHO HEIGHT -    52.    (meters)      171.    (feet) SCALED
 HV7571  ______________________________________________________________________
 HV7571  GEOID HEIGHT    -        -32.230 (meters)                     GEOID18
 HV7571  LAPLACE CORR    -         -2.97  (seconds)                    DEFLEC18
 HV7571  HORZ ORDER      -  SECOND
 HV7571
 HV7571.The horizontal coordinates were established by classical geodetic methods
 HV7571.and adjusted by the National Geodetic Survey in November 1994.
 HV7571
 HV7571.The orthometric height was scaled from a topographic map.
 HV7571
 HV7571.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7571.GEOID18 height accuracy estimate available here.
 HV7571
 HV7571.Click photographs - Photos may exist for this station.
 HV7571
 HV7571.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7571
 HV7571. The following values were computed from the NAD 83(1993) position.
 HV7571
 HV7571;                    North         East     Units Scale Factor Converg.
 HV7571;SPC MD       -   130,468.049   400,519.577   MT  0.99995002   +0 00 13.5
 HV7571;SPC MD       -   428,043.92  1,314,037.98   sFT  0.99995002   +0 00 13.5
 HV7571;SPC VA N     - 2,131,535.191 3,630,736.071   MT  0.99995604   +0 56 23.7
 HV7571;SPC VA N     - 6,993,211.71 11,911,839.93   sFT  0.99995604   +0 56 23.7
 HV7571;UTM  18      - 4,301,133.629   326,943.879   MT  0.99996879   -1 15 03.3
 HV7571
 HV7571!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7571!SPC MD       -   0.99999694  x   0.99995002  =   0.99994696
 HV7571!SPC VA N     -   0.99999694  x   0.99995604  =   0.99995298
 HV7571!UTM  18      -   0.99999694  x   0.99996879  =   0.99996573
 HV7571
 HV7571:                Primary Azimuth Mark                     Grid Az
 HV7571:SPC MD       -  S E 164 B 1960                           174 13 15.3
 HV7571:SPC VA N     -  S E 164 B 1960                           173 17 05.1
 HV7571:UTM  18      -  S E 164 B 1960                           175 28 32.1
 HV7571
 HV7571_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2694301133(NAD 83)
 HV7571
 HV7571|---------------------------------------------------------------------|
 HV7571| PID    Reference Object                     Distance      Geod. Az  |
 HV7571|                                                           dddmmss.s |
 HV7571| HV7572 S E 164 B 1960                      APPROX. 0.6 KM 1741328.8 |
 HV7571| HV7569 S E 164 1960                        177.482 METERS 35129     |
 HV7571| HV1456 SE 164 RESET                        181.395 METERS 35840     |
 HV7571|---------------------------------------------------------------------|
 HV7571
 HV7571                          SUPERSEDED SURVEY CONTROL
 HV7571
 HV7571  NAD 83(1991)-  38 50 31.23612(N)    076 59 38.45517(W) AD(       ) 2
 HV7571  NAD 83(1986)-  38 50 31.23477(N)    076 59 38.46627(W) AD(       ) 2
 HV7571  NAD 27      -  38 50 30.83210(N)    076 59 39.55880(W) AD(       ) 2
 HV7571
 HV7571.Superseded values are not recommended for survey control.
 HV7571
 HV7571.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7571.See file dsdata.pdf to determine how the superseded data were derived.
 HV7571
 HV7571_MARKER: Z = SEE DESCRIPTION
 HV7571_SETTING: 0 = UNSPECIFIED SETTING
 HV7571_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7571
 HV7571  HISTORY     - Date     Condition        Report By
 HV7571  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7571  HISTORY     - 1971     GOOD             NGS
 HV7571
 HV7571                          STATION DESCRIPTION
 HV7571
 HV7571'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7571'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7571
 HV7571                          STATION RECOVERY (1971)
 HV7571
 HV7571'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7571'STATION AND REFERENCE POINTS RECOVERED AS DESCRIBED IN GOOD
 HV7571'CONDITION.  THE STATION IS ACROSS THE STREET FROM, AND 3 FEET
 HV7571'NORTH OF THE EXTENDED TANGENT OF THE NORTH SIDE OF A BRICK HOUSE,
 HV7571'NO. 3306.
 HV7571'
 HV7571'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7571'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7572 ***********************************************************************
 HV7572  DESIGNATION -  S E 164 B 1960
 HV7572  PID         -  HV7572
 HV7572  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7572  COUNTRY     -  US
 HV7572  USGS QUAD   -  ANACOSTIA (2016)
 HV7572
 HV7572                         *CURRENT SURVEY CONTROL
 HV7572  ______________________________________________________________________
 HV7572* NAD 83(1993) POSITION- 38 50 12.39986(N) 076 59 36.01823(W)   ADJUSTED
 HV7572* NAVD 88 ORTHO HEIGHT -    27.    (meters)       89.    (feet) SCALED
 HV7572  ______________________________________________________________________
 HV7572  GEOID HEIGHT    -        -32.241 (meters)                     GEOID18
 HV7572  LAPLACE CORR    -         -3.08  (seconds)                    DEFLEC18
 HV7572  HORZ ORDER      -  SECOND
 HV7572
 HV7572.The horizontal coordinates were established by classical geodetic methods
 HV7572.and adjusted by the National Geodetic Survey in November 1994.
 HV7572
 HV7572.The orthometric height was scaled from a topographic map.
 HV7572
 HV7572.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7572.GEOID18 height accuracy estimate available here.
 HV7572
 HV7572.Click photographs - Photos may exist for this station.
 HV7572
 HV7572.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7572
 HV7572. The following values were computed from the NAD 83(1993) position.
 HV7572
 HV7572;                    North         East     Units Scale Factor Converg.
 HV7572;SPC MD       -   129,887.183   400,578.365   MT  0.99995008   +0 00 15.1
 HV7572;SPC MD       -   426,138.20  1,314,230.85   sFT  0.99995008   +0 00 15.1
 HV7572;SPC VA N     - 2,130,955.360 3,630,804.342   MT  0.99995569   +0 56 25.2
 HV7572;SPC VA N     - 6,991,309.38 11,912,063.91   sFT  0.99995569   +0 56 25.2
 HV7572;UTM  18      - 4,300,551.605   326,989.935   MT  0.99996860   -1 15 01.2
 HV7572
 HV7572!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7572!SPC MD       -   1.00000086  x   0.99995008  =   0.99995094
 HV7572!SPC VA N     -   1.00000086  x   0.99995569  =   0.99995655
 HV7572!UTM  18      -   1.00000086  x   0.99996860  =   0.99996946
 HV7572
 HV7572:                Primary Azimuth Mark                     Grid Az
 HV7572:SPC MD       -  S E 164 A 1960                           354 13 15.2
 HV7572:SPC VA N     -  S E 164 A 1960                           353 17 05.1
 HV7572:UTM  18      -  S E 164 A 1960                           355 28 31.5
 HV7572
 HV7572_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2698900551(NAD 83)
 HV7572
 HV7572|---------------------------------------------------------------------|
 HV7572| PID    Reference Object                     Distance      Geod. Az  |
 HV7572|                                                           dddmmss.s |
 HV7572| HV7574 S E 164 C 1960                      239.829 METERS 14435     |
 HV7572| HV7571 S E 164 A 1960                      APPROX. 0.6 KM 3541330.3 |
 HV7572|---------------------------------------------------------------------|
 HV7572
 HV7572                          SUPERSEDED SURVEY CONTROL
 HV7572
 HV7572  NAD 83(1991)-  38 50 12.39825(N)    076 59 36.01913(W) AD(       ) 2
 HV7572  NAD 83(1986)-  38 50 12.39691(N)    076 59 36.03026(W) AD(       ) 2
 HV7572  NAD 27      -  38 50 11.99400(N)    076 59 37.12280(W) AD(       ) 2
 HV7572
 HV7572.Superseded values are not recommended for survey control.
 HV7572
 HV7572.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7572.See file dsdata.pdf to determine how the superseded data were derived.
 HV7572
 HV7572_MARKER: Z = SEE DESCRIPTION
 HV7572_SETTING: 0 = UNSPECIFIED SETTING
 HV7572_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7572
 HV7572  HISTORY     - Date     Condition        Report By
 HV7572  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7572  HISTORY     - 1971     GOOD             NGS
 HV7572
 HV7572                          STATION DESCRIPTION
 HV7572
 HV7572'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7572'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7572
 HV7572                          STATION RECOVERY (1971)
 HV7572
 HV7572'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7572'STATION AND REFERENCE POINTS RECOVERED, STATION IS IN GOOD
 HV7572'CONDITION.  THE CROSS CUT ON MANHOLES REFERENCED TO HAVE WORN OFF
 HV7572'NOT VISIBLE, HOWEVER, THE MANHOLES REMAIN.  THE ARROW INDICATING
 HV7572'NORTH IS INCORRECT, THE ARROW IS POINTING EAST INSTEAD OF NORTH
 HV7572'THAT IS SHOWN ON THE SKETCH.
 HV7572'
 HV7572'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7572'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7574 ***********************************************************************
 HV7574  DESIGNATION -  S E 164 C 1960
 HV7574  PID         -  HV7574
 HV7574  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7574  COUNTRY     -  US
 HV7574  USGS QUAD   -  ANACOSTIA (2016)
 HV7574
 HV7574                         *CURRENT SURVEY CONTROL
 HV7574  ______________________________________________________________________
 HV7574* NAD 83(1993) POSITION- 38 50 06.06200(N) 076 59 30.25493(W)   ADJUSTED
 HV7574* NAVD 88 ORTHO HEIGHT -    49.    (meters)      161.    (feet) SCALED
 HV7574  ______________________________________________________________________
 HV7574  GEOID HEIGHT    -        -32.247 (meters)                     GEOID18
 HV7574  LAPLACE CORR    -         -3.13  (seconds)                    DEFLEC18
 HV7574  HORZ ORDER      -  SECOND
 HV7574
 HV7574.The horizontal coordinates were established by classical geodetic methods
 HV7574.and adjusted by the National Geodetic Survey in November 1994.
 HV7574
 HV7574.The orthometric height was scaled from a topographic map.
 HV7574
 HV7574.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7574.GEOID18 height accuracy estimate available here.
 HV7574
 HV7574.Click photographs - Photos may exist for this station.
 HV7574
 HV7574.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7574
 HV7574. The following values were computed from the NAD 83(1993) position.
 HV7574
 HV7574;                    North         East     Units Scale Factor Converg.
 HV7574;SPC MD       -   129,691.765   400,717.376   MT  0.99995010   +0 00 18.7
 HV7574;SPC MD       -   425,497.07  1,314,686.92   sFT  0.99995010   +0 00 18.7
 HV7574;SPC VA N     - 2,130,762.239 3,630,946.527   MT  0.99995557   +0 56 28.8
 HV7574;SPC VA N     - 6,990,675.78 11,912,530.40   sFT  0.99995557   +0 56 28.8
 HV7574;UTM  18      - 4,300,353.187   327,124.636   MT  0.99996802   -1 14 57.4
 HV7574
 HV7574!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7574!SPC MD       -   0.99999741  x   0.99995010  =   0.99994751
 HV7574!SPC VA N     -   0.99999741  x   0.99995557  =   0.99995298
 HV7574!UTM  18      -   0.99999741  x   0.99996802  =   0.99996543
 HV7574
 HV7574_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2712400353(NAD 83)
 HV7574
 HV7574                          SUPERSEDED SURVEY CONTROL
 HV7574
 HV7574  NAD 83(1991)-  38 50 06.06039(N)    076 59 30.25583(W) AD(       ) 2
 HV7574  NAD 83(1986)-  38 50 06.05906(N)    076 59 30.26697(W) AD(       ) 2
 HV7574  NAD 27      -  38 50 05.65610(N)    076 59 31.35960(W) AD(       ) 2
 HV7574
 HV7574.Superseded values are not recommended for survey control.
 HV7574
 HV7574.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7574.See file dsdata.pdf to determine how the superseded data were derived.
 HV7574
 HV7574_MARKER: Z = SEE DESCRIPTION
 HV7574_SETTING: 0 = UNSPECIFIED SETTING
 HV7574_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7574
 HV7574  HISTORY     - Date     Condition        Report By
 HV7574  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7574  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7574
 HV7574                          STATION DESCRIPTION
 HV7574
 HV7574'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7574'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7574
 HV7574                          STATION RECOVERY (1971)
 HV7574
 HV7574'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7574'THE STATION WAS NOT RECOVERED AND CAN BE CONSIDERED LOST.  IT
 HV7574'APPEARS THAT A NEW SEWER LINE HAS BEEN PUT IN AT THIS SITE AND THE
 HV7574'PORTION OF THE CURBING AT STATION SITE HAS BEEN REPLACED.  THE
 HV7574'REFERENCE POINTS WERE RECOVERED IN GOOD CONDITION AND A POINT TO
 HV7574'BE USED FOR THE STATION CAN BE RE-ESTABLISHED FROM THEM.  STATION
 HV7574'SITE IS AT INTERSECTION OF WHEELER RD. SE AND VARNEY STREET SE.
 HV7574'
 HV7574'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7574'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7559 ***********************************************************************
 HV7559  DESIGNATION -  S E 164 D 1960
 HV7559  PID         -  HV7559
 HV7559  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7559  COUNTRY     -  US
 HV7559  USGS QUAD   -  ANACOSTIA (2016)
 HV7559
 HV7559                         *CURRENT SURVEY CONTROL
 HV7559  ______________________________________________________________________
 HV7559* NAD 83(1993) POSITION- 38 50 01.10611(N) 076 59 22.49748(W)   ADJUSTED
 HV7559* NAVD 88 ORTHO HEIGHT -    55.    (meters)      180.    (feet) SCALED
 HV7559  ______________________________________________________________________
 HV7559  GEOID HEIGHT    -        -32.253 (meters)                     GEOID18
 HV7559  LAPLACE CORR    -         -3.17  (seconds)                    DEFLEC18
 HV7559  HORZ ORDER      -  SECOND
 HV7559
 HV7559.The horizontal coordinates were established by classical geodetic methods
 HV7559.and adjusted by the National Geodetic Survey in November 1994.
 HV7559
 HV7559.The orthometric height was scaled from a topographic map.
 HV7559
 HV7559.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7559.GEOID18 height accuracy estimate available here.
 HV7559
 HV7559.Click photographs - Photos may exist for this station.
 HV7559
 HV7559.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7559
 HV7559. The following values were computed from the NAD 83(1993) position.
 HV7559
 HV7559;                    North         East     Units Scale Factor Converg.
 HV7559;SPC MD       -   129,538.968   400,904.483   MT  0.99995012   +0 00 23.5
 HV7559;SPC MD       -   424,995.76  1,315,300.79   sFT  0.99995012   +0 00 23.5
 HV7559;SPC VA N     - 2,130,612.518 3,631,136.107   MT  0.99995548   +0 56 33.6
 HV7559;SPC VA N     - 6,990,184.57 11,913,152.38   sFT  0.99995548   +0 56 33.6
 HV7559;UTM  18      - 4,300,196.328   327,308.357   MT  0.99996724   -1 14 52.4
 HV7559
 HV7559!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7559!SPC MD       -   0.99999647  x   0.99995012  =   0.99994659
 HV7559!SPC VA N     -   0.99999647  x   0.99995548  =   0.99995195
 HV7559!UTM  18      -   0.99999647  x   0.99996724  =   0.99996371
 HV7559
 HV7559_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2730800196(NAD 83)
 HV7559
 HV7559                          SUPERSEDED SURVEY CONTROL
 HV7559
 HV7559  NAD 83(1991)-  38 50 01.10450(N)    076 59 22.49838(W) AD(       ) 2
 HV7559  NAD 83(1986)-  38 50 01.10316(N)    076 59 22.50953(W) AD(       ) 2
 HV7559  NAD 27      -  38 50 00.70020(N)    076 59 23.60240(W) AD(       ) 2
 HV7559
 HV7559.Superseded values are not recommended for survey control.
 HV7559
 HV7559.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7559.See file dsdata.pdf to determine how the superseded data were derived.
 HV7559
 HV7559_MARKER: Z = SEE DESCRIPTION
 HV7559_SETTING: 0 = UNSPECIFIED SETTING
 HV7559_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7559
 HV7559  HISTORY     - Date     Condition        Report By
 HV7559  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7559  HISTORY     - 1971     GOOD             NGS
 HV7559
 HV7559                          STATION DESCRIPTION
 HV7559
 HV7559'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7559'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7559
 HV7559                          STATION RECOVERY (1971)
 HV7559
 HV7559'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7559'STATION RECOVERED IN GOOD CONDITION AND REFERENCE POINTS RECOVERED
 HV7559'AS SHOWN ON SKETCH DESCRIPTION.
 HV7559'
 HV7559'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7559'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7562 ***********************************************************************
 HV7562  DESIGNATION -  S E 165 A 1960
 HV7562  PID         -  HV7562
 HV7562  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7562  COUNTRY     -  US
 HV7562  USGS QUAD   -  ANACOSTIA (2016)
 HV7562
 HV7562                         *CURRENT SURVEY CONTROL
 HV7562  ______________________________________________________________________
 HV7562* NAD 83(1993) POSITION- 38 50 40.73834(N) 076 59 17.38680(W)   ADJUSTED
 HV7562* NAVD 88 ORTHO HEIGHT -    55.    (meters)      180.    (feet) SCALED
 HV7562  ______________________________________________________________________
 HV7562  GEOID HEIGHT    -        -32.235 (meters)                     GEOID18
 HV7562  LAPLACE CORR    -         -3.16  (seconds)                    DEFLEC18
 HV7562  HORZ ORDER      -  SECOND
 HV7562
 HV7562.The horizontal coordinates were established by classical geodetic methods
 HV7562.and adjusted by the National Geodetic Survey in November 1994.
 HV7562
 HV7562.The orthometric height was scaled from a topographic map.
 HV7562
 HV7562.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7562.GEOID18 height accuracy estimate available here.
 HV7562
 HV7562.Click photographs - Photos may exist for this station.
 HV7562
 HV7562.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7562
 HV7562. The following values were computed from the NAD 83(1993) position.
 HV7562
 HV7562;                    North         East     Units Scale Factor Converg.
 HV7562;SPC MD       -   130,761.053   401,027.584   MT  0.99994999   +0 00 26.7
 HV7562;SPC MD       -   429,005.22  1,315,704.67   sFT  0.99994999   +0 00 26.7
 HV7562;SPC VA N     - 2,131,836.458 3,631,239.226   MT  0.99995622   +0 56 36.8
 HV7562;SPC VA N     - 6,994,200.11 11,913,490.69   sFT  0.99995622   +0 56 36.8
 HV7562;UTM  18      - 4,301,415.444   327,458.188   MT  0.99996660   -1 14 50.3
 HV7562
 HV7562!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7562!SPC MD       -   0.99999647  x   0.99994999  =   0.99994646
 HV7562!SPC VA N     -   0.99999647  x   0.99995622  =   0.99995269
 HV7562!UTM  18      -   0.99999647  x   0.99996660  =   0.99996307
 HV7562
 HV7562:                Primary Azimuth Mark                     Grid Az
 HV7562:SPC MD       -  SE 165                                   070 27 52.1
 HV7562:SPC VA N     -  SE 165                                   069 31 42.0
 HV7562:UTM  18      -  SE 165                                   071 43 09.1
 HV7562
 HV7562_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2745801415(NAD 83)
 HV7562
 HV7562|---------------------------------------------------------------------|
 HV7562| PID    Reference Object                     Distance      Geod. Az  |
 HV7562|                                                           dddmmss.s |
 HV7562| HV1455 SE 165                              APPROX. 0.7 KM 0702818.8 |
 HV7562|---------------------------------------------------------------------|
 HV7562
 HV7562                          SUPERSEDED SURVEY CONTROL
 HV7562
 HV7562  NAD 83(1991)-  38 50 40.73673(N)    076 59 17.38766(W) AD(       ) 2
 HV7562  NAD 83(1986)-  38 50 40.73628(N)    076 59 17.39898(W) AD(       ) 2
 HV7562  NAD 27      -  38 50 40.33440(N)    076 59 18.49240(W) AD(       ) 2
 HV7562
 HV7562.Superseded values are not recommended for survey control.
 HV7562
 HV7562.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7562.See file dsdata.pdf to determine how the superseded data were derived.
 HV7562
 HV7562_MARKER: DS = TRIANGULATION STATION DISK
 HV7562_SETTING: 0 = UNSPECIFIED SETTING
 HV7562_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7562
 HV7562  HISTORY     - Date     Condition        Report By
 HV7562  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7562  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7562
 HV7562                          STATION DESCRIPTION
 HV7562
 HV7562'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7562'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV7562'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO S.E. 165-A
 HV7562'GROUTED IN CONCRETE.
 HV7562
 HV7562                          STATION RECOVERY (1971)
 HV7562
 HV7562'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7562'STATION WAS NOT RECOVERED AND HAS BEEN PROBABLY DESTROYED WHEN
 HV7562'NEW SECTION OF SIDEWALK WAS PUT IN.
 HV7562'
 HV7562'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7562'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7561 ***********************************************************************
 HV7561  DESIGNATION -  S E 167 A 1960
 HV7561  PID         -  HV7561
 HV7561  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7561  COUNTRY     -  US
 HV7561  USGS QUAD   -  ANACOSTIA (2016)
 HV7561
 HV7561                         *CURRENT SURVEY CONTROL
 HV7561  ______________________________________________________________________
 HV7561* NAD 83(1993) POSITION- 38 49 52.82658(N) 076 59 18.37864(W)   ADJUSTED
 HV7561* NAVD 88 ORTHO HEIGHT -    56.    (meters)      184.    (feet) SCALED
 HV7561  ______________________________________________________________________
 HV7561  GEOID HEIGHT    -        -32.259 (meters)                     GEOID18
 HV7561  LAPLACE CORR    -         -3.18  (seconds)                    DEFLEC18
 HV7561  HORZ ORDER      -  SECOND
 HV7561
 HV7561.The horizontal coordinates were established by classical geodetic methods
 HV7561.and adjusted by the National Geodetic Survey in November 1994.
 HV7561
 HV7561.The orthometric height was scaled from a topographic map.
 HV7561
 HV7561.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7561.GEOID18 height accuracy estimate available here.
 HV7561
 HV7561.Click photographs - Photos may exist for this station.
 HV7561
 HV7561.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7561
 HV7561. The following values were computed from the NAD 83(1993) position.
 HV7561
 HV7561;                    North         East     Units Scale Factor Converg.
 HV7561;SPC MD       -   129,283.679   401,003.853   MT  0.99995015   +0 00 26.1
 HV7561;SPC MD       -   424,158.20  1,315,626.81   sFT  0.99995015   +0 00 26.1
 HV7561;SPC VA N     - 2,130,358.886 3,631,239.636   MT  0.99995533   +0 56 36.2
 HV7561;SPC VA N     - 6,989,352.45 11,913,492.04   sFT  0.99995533   +0 56 36.2
 HV7561;UTM  18      - 4,299,938.920   327,402.116   MT  0.99996684   -1 14 49.6
 HV7561
 HV7561!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7561!SPC MD       -   0.99999631  x   0.99995015  =   0.99994646
 HV7561!SPC VA N     -   0.99999631  x   0.99995533  =   0.99995164
 HV7561!UTM  18      -   0.99999631  x   0.99996684  =   0.99996315
 HV7561
 HV7561:                Primary Azimuth Mark                     Grid Az
 HV7561:SPC MD       -  S E 167 B 1960                           225 10 13.7
 HV7561:SPC VA N     -  S E 167 B 1960                           224 14 03.6
 HV7561:UTM  18      -  S E 167 B 1960                           226 25 29.4
 HV7561
 HV7561_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2740299938(NAD 83)
 HV7561
 HV7561|---------------------------------------------------------------------|
 HV7561| PID    Reference Object                     Distance      Geod. Az  |
 HV7561|                                                           dddmmss.s |
 HV7561| HV7557 SE 167                              120.946 METERS 05142     |
 HV7561| HV7570 S E 167 B 1960                      APPROX. 0.7 KM 2251039.8 |
 HV7561|---------------------------------------------------------------------|
 HV7561
 HV7561                          SUPERSEDED SURVEY CONTROL
 HV7561
 HV7561  NAD 83(1991)-  38 49 52.82497(N)    076 59 18.37957(W) AD(       ) 2
 HV7561  NAD 83(1986)-  38 49 52.82354(N)    076 59 18.39078(W) AD(       ) 2
 HV7561  NAD 27      -  38 49 52.42000(N)    076 59 19.48550(W) AD(       ) 2
 HV7561
 HV7561.Superseded values are not recommended for survey control.
 HV7561
 HV7561.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7561.See file dsdata.pdf to determine how the superseded data were derived.
 HV7561
 HV7561_MARKER: Z = SEE DESCRIPTION
 HV7561_SETTING: 0 = UNSPECIFIED SETTING
 HV7561_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7561
 HV7561  HISTORY     - Date     Condition        Report By
 HV7561  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7561  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7561
 HV7561                          STATION DESCRIPTION
 HV7561
 HV7561'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7561'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7561
 HV7561                          STATION RECOVERY (1971)
 HV7561
 HV7561'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7561'STATION NOT RECOVERED, LOCATION HAS BEEN COVERED WITH CONCRETE AND
 HV7561'BRICK, POSSIBLY THE STATION HAS BEEN DESTROYED.
 HV7561'
 HV7561'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7561'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7570 ***********************************************************************
 HV7570  DESIGNATION -  S E 167 B 1960
 HV7570  PID         -  HV7570
 HV7570  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7570  COUNTRY     -  US
 HV7570  USGS QUAD   -  ANACOSTIA (2016)
 HV7570
 HV7570                         *CURRENT SURVEY CONTROL
 HV7570  ______________________________________________________________________
 HV7570* NAD 83(1993) POSITION- 38 49 37.16867(N) 076 59 38.51963(W)   ADJUSTED
 HV7570* NAVD 88 ORTHO HEIGHT -    43.    (meters)      141.    (feet) SCALED
 HV7570  ______________________________________________________________________
 HV7570  GEOID HEIGHT    -        -32.258 (meters)                     GEOID18
 HV7570  LAPLACE CORR    -         -3.11  (seconds)                    DEFLEC18
 HV7570  HORZ ORDER      -  SECOND
 HV7570
 HV7570.The horizontal coordinates were established by classical geodetic methods
 HV7570.and adjusted by the National Geodetic Survey in November 1994.
 HV7570
 HV7570.The orthometric height was scaled from a topographic map.
 HV7570
 HV7570.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7570.GEOID18 height accuracy estimate available here.
 HV7570
 HV7570.Click photographs - Photos may exist for this station.
 HV7570
 HV7570.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7570
 HV7570. The following values were computed from the NAD 83(1993) position.
 HV7570
 HV7570;                    North         East     Units Scale Factor Converg.
 HV7570;SPC MD       -   128,800.818   400,518.110   MT  0.99995021   +0 00 13.5
 HV7570;SPC MD       -   422,574.02  1,314,033.17   sFT  0.99995021   +0 00 13.5
 HV7570;SPC VA N     - 2,129,868.150 3,630,761.844   MT  0.99995505   +0 56 23.6
 HV7570;SPC VA N     - 6,987,742.42 11,911,924.48   sFT  0.99995505   +0 56 23.6
 HV7570;UTM  18      - 4,299,466.799   326,905.911   MT  0.99996896   -1 15 01.8
 HV7570
 HV7570!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7570!SPC MD       -   0.99999835  x   0.99995021  =   0.99994856
 HV7570!SPC VA N     -   0.99999835  x   0.99995505  =   0.99995340
 HV7570!UTM  18      -   0.99999835  x   0.99996896  =   0.99996731
 HV7570
 HV7570:                Primary Azimuth Mark                     Grid Az
 HV7570:SPC MD       -  S E 167 A 1960                           045 10 13.7
 HV7570:SPC VA N     -  S E 167 A 1960                           044 14 03.6
 HV7570:UTM  18      -  S E 167 A 1960                           046 25 29.0
 HV7570
 HV7570_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2690599466(NAD 83)
 HV7570
 HV7570|---------------------------------------------------------------------|
 HV7570| PID    Reference Object                     Distance      Geod. Az  |
 HV7570|                                                           dddmmss.s |
 HV7570| HV7561 S E 167 A 1960                      APPROX. 0.7 KM 0451027.2 |
 HV7570|---------------------------------------------------------------------|
 HV7570
 HV7570                          SUPERSEDED SURVEY CONTROL
 HV7570
 HV7570  NAD 83(1991)-  38 49 37.16704(N)    076 59 38.52059(W) AD(       ) 2
 HV7570  NAD 83(1986)-  38 49 37.16568(N)    076 59 38.53183(W) AD(       ) 2
 HV7570  NAD 27      -  38 49 36.76190(N)    076 59 39.62560(W) AD(       ) 2
 HV7570
 HV7570.Superseded values are not recommended for survey control.
 HV7570
 HV7570.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7570.See file dsdata.pdf to determine how the superseded data were derived.
 HV7570
 HV7570_MARKER: Z = SEE DESCRIPTION
 HV7570_SETTING: 0 = UNSPECIFIED SETTING
 HV7570_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7570
 HV7570  HISTORY     - Date     Condition        Report By
 HV7570  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7570  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7570
 HV7570                          STATION DESCRIPTION
 HV7570
 HV7570'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7570'THE STATION IS A SCREW SET IN A PIPE IN THE SIDEWALK.
 HV7570
 HV7570                          STATION RECOVERY (1971)
 HV7570
 HV7570'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7570'STATION WAS DESTROYED WHEN NEW SIDEWALK WAS PUT IN AND A NEW
 HV7570'APARTMENT BUILDING WAS BUILT TO THE NORTH OF STATION SITE PARK
 HV7570'SOUTHERN 800.
 HV7570'
 HV7570'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7570'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4459 ***********************************************************************
 HV4459  DESIGNATION -  S USE 1913
 HV4459  PID         -  HV4459
 HV4459  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4459  COUNTRY     -  US
 HV4459  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4459
 HV4459                         *CURRENT SURVEY CONTROL
 HV4459  ______________________________________________________________________
 HV4459* NAD 83(1993) POSITION- 38 52 50.49425(N) 077 01 53.98126(W)   ADJUSTED
 HV4459* NAVD 88 ORTHO HEIGHT -     2.    (meters)        7.    (feet) SCALED
 HV4459  ______________________________________________________________________
 HV4459  GEOID HEIGHT    -        -32.111 (meters)                     GEOID18
 HV4459  LAPLACE CORR    -         -2.75  (seconds)                    DEFLEC18
 HV4459  HORZ ORDER      -  THIRD
 HV4459
 HV4459.The horizontal coordinates were established by classical geodetic methods
 HV4459.and adjusted by the National Geodetic Survey in November 1994.
 HV4459
 HV4459.The orthometric height was scaled from a topographic map.
 HV4459
 HV4459.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4459.GEOID18 height accuracy estimate available here.
 HV4459
 HV4459.Click photographs - Photos may exist for this station.
 HV4459
 HV4459.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4459
 HV4459. The following values were computed from the NAD 83(1993) position.
 HV4459
 HV4459;                    North         East     Units Scale Factor Converg.
 HV4459;SPC MD       -   134,762.533   397,252.819   MT  0.99994985   -0 01 11.5
 HV4459;SPC MD       -   442,133.41  1,303,320.29   sFT  0.99994985   -0 01 11.5
 HV4459;SPC VA N     - 2,135,775.757 3,627,399.555   MT  0.99995891   +0 54 59.1
 HV4459;SPC VA N     - 7,007,124.30 11,900,893.37   sFT  0.99995891   +0 54 59.1
 HV4459;UTM  18      - 4,305,498.755   323,771.896   MT  0.99998243   -1 16 32.2
 HV4459
 HV4459!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4459!SPC MD       -   1.00000476  x   0.99994985  =   0.99995461
 HV4459!SPC VA N     -   1.00000476  x   0.99995891  =   0.99996367
 HV4459!UTM  18      -   1.00000476  x   0.99998243  =   0.99998719
 HV4459
 HV4459_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2377105498(NAD 83)
 HV4459
 HV4459                          SUPERSEDED SURVEY CONTROL
 HV4459
 HV4459  NAD 83(1991)-  38 52 50.49298(N)    077 01 53.98263(W) AD(       ) 3
 HV4459  NAD 83(1986)-  38 52 50.49263(N)    077 01 53.99341(W) AD(       ) 3
 HV4459  NAD 27      -  38 52 50.09000(N)    077 01 55.07000(W) AD(       ) 3
 HV4459  USSD        -  38 52 50.42800(N)    077 01 54.90300(W) AD(       ) 3
 HV4459
 HV4459.Superseded values are not recommended for survey control.
 HV4459
 HV4459.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4459.See file dsdata.pdf to determine how the superseded data were derived.
 HV4459
 HV4459_MARKER: H = DRILL HOLE
 HV4459_SETTING: 0 = UNSPECIFIED SETTING
 HV4459_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4459
 HV4459  HISTORY     - Date     Condition        Report By
 HV4459  HISTORY     - 1913     MONUMENTED       USACE
 HV4459  HISTORY     - 1939     MARK NOT FOUND   CGS
 HV4459
 HV4459                          STATION DESCRIPTION
 HV4459
 HV4459'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1913 (OBF)
 HV4459'STATION IS A 3/4-INCH DRILL HOLE 1 INCH DEEP IN SEA WALL ON
 HV4459'HARBOR SIDE OF POTOMAC PARK AND S OF RAILROAD SOME 100 METERS.
 HV4459'IT IS AT S END OF THE GROUNDS SURROUNDING THE SHOPS, ETC., AT
 HV4459'ENGINEERS WHARF.  IT IS JUST BELOW A 6-INCH CHANGE IN ELEVATION
 HV4459'OF THE WALL.
 HV4459
 HV4459                          STATION RECOVERY (1939)
 HV4459
 HV4459'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4459'THE SEA WALL AT THIS PLACE HAS BEEN REPAIRED AND THE MARK
 HV4459'DESTROYED OR COVERED OVER WITH MASONRY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4706 ***********************************************************************
 HV4706  DESIGNATION -  S W 1 1960
 HV4706  PID         -  HV4706
 HV4706  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4706  COUNTRY     -  US
 HV4706  USGS QUAD   -  ALEXANDRIA (2019)
 HV4706
 HV4706                         *CURRENT SURVEY CONTROL
 HV4706  ______________________________________________________________________
 HV4706* NAD 83(1993) POSITION- 38 51 49.19921(N) 077 00 43.72623(W)   ADJUSTED
 HV4706* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV4706  ______________________________________________________________________
 HV4706  GEOID HEIGHT    -        -32.172 (meters)                     GEOID18
 HV4706  LAPLACE CORR    -         -3.00  (seconds)                    DEFLEC18
 HV4706  HORZ ORDER      -  SECOND
 HV4706
 HV4706.The horizontal coordinates were established by classical geodetic methods
 HV4706.and adjusted by the National Geodetic Survey in November 1994.
 HV4706
 HV4706.The orthometric height was scaled from a topographic map.
 HV4706
 HV4706.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4706.GEOID18 height accuracy estimate available here.
 HV4706
 HV4706.Click photographs - Photos may exist for this station.
 HV4706
 HV4706.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4706
 HV4706. The following values were computed from the NAD 83(1993) position.
 HV4706
 HV4706;                    North         East     Units Scale Factor Converg.
 HV4706;SPC MD       -   132,872.069   398,945.857   MT  0.99994987   -0 00 27.4
 HV4706;SPC MD       -   435,931.11  1,308,874.87   sFT  0.99994987   -0 00 27.4
 HV4706;SPC VA N     - 2,133,913.194 3,629,123.271   MT  0.99995759   +0 55 42.9
 HV4706;SPC VA N     - 7,001,013.54 11,906,548.60   sFT  0.99995759   +0 55 42.9
 HV4706;UTM  18      - 4,303,571.593   325,423.154   MT  0.99997530   -1 15 46.4
 HV4706
 HV4706!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4706!SPC MD       -   1.00000493  x   0.99994987  =   0.99995480
 HV4706!SPC VA N     -   1.00000493  x   0.99995759  =   0.99996252
 HV4706!UTM  18      -   1.00000493  x   0.99997530  =   0.99998023
 HV4706
 HV4706:                Primary Azimuth Mark                     Grid Az
 HV4706:SPC MD       -  INSANE                                   133 03 42.3
 HV4706:SPC VA N     -  INSANE                                   132 07 32.0
 HV4706:UTM  18      -  INSANE                                   134 19 01.3
 HV4706
 HV4706_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2542303571(NAD 83)
 HV4706
 HV4706|---------------------------------------------------------------------|
 HV4706| PID    Reference Object                     Distance      Geod. Az  |
 HV4706|                                                           dddmmss.s |
 HV4706| HV4675 INSANE                              APPROX. 1.4 KM 1330314.9 |
 HV4706|---------------------------------------------------------------------|
 HV4706
 HV4706                          SUPERSEDED SURVEY CONTROL
 HV4706
 HV4706  NAD 83(1991)-  38 51 49.19774(N)    077 00 43.72739(W) AD(       ) 2
 HV4706  NAD 83(1986)-  38 51 49.19734(N)    077 00 43.73832(W) AD(       ) 2
 HV4706  NAD 27      -  38 51 48.79540(N)    077 00 44.81970(W) AD(       ) 2
 HV4706
 HV4706.Superseded values are not recommended for survey control.
 HV4706
 HV4706.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4706.See file dsdata.pdf to determine how the superseded data were derived.
 HV4706
 HV4706_MARKER: Z = SEE DESCRIPTION
 HV4706_SETTING: 0 = UNSPECIFIED SETTING
 HV4706_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4706
 HV4706  HISTORY     - Date     Condition        Report By
 HV4706  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4706  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4706
 HV4706                          STATION DESCRIPTION
 HV4706
 HV4706'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4706'STATION WAS NOT RECOVERED.  THE ROAD HAS BEEN RESURFACED OVER THIS
 HV4706'POINT.  THE EAST ONE OF 4 POST REFERENCED TO HAS BEEN
 HV4706'DESTROYED.  THE TACK IN TOP OF THE MOST WESTERLY ONE OF 4 POST
 HV4706'WAS RECOVERED, THE C AND P POLE NO. 613-A HAS BEEN REPLACED BY A
 HV4706'NEW POLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2905 ***********************************************************************
 HV2905  DESIGNATION -  S W 149 A
 HV2905  PID         -  HV2905
 HV2905  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2905  COUNTRY     -  US
 HV2905  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2905
 HV2905                         *CURRENT SURVEY CONTROL
 HV2905  ______________________________________________________________________
 HV2905* NAD 83(1993) POSITION- 38 53 19.59925(N) 077 03 45.61390(W)   ADJUSTED
 HV2905* NAVD 88 ORTHO HEIGHT -     6.    (meters)       20.    (feet) SCALED
 HV2905  ______________________________________________________________________
 HV2905  GEOID HEIGHT    -        -32.053 (meters)                     GEOID18
 HV2905  LAPLACE CORR    -         -2.93  (seconds)                    DEFLEC18
 HV2905  HORZ ORDER      -  SECOND
 HV2905
 HV2905.The horizontal coordinates were established by classical geodetic methods
 HV2905.and adjusted by the National Geodetic Survey in November 1994.
 HV2905
 HV2905.The orthometric height was scaled from a topographic map.
 HV2905
 HV2905.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2905.GEOID18 height accuracy estimate available here.
 HV2905
 HV2905.Click photographs - Photos may exist for this station.
 HV2905
 HV2905.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2905
 HV2905. The following values were computed from the NAD 83(1993) position.
 HV2905
 HV2905;                    North         East     Units Scale Factor Converg.
 HV2905;SPC MD       -   135,661.389   394,562.861   MT  0.99994987   -0 02 21.6
 HV2905;SPC MD       -   445,082.41  1,294,494.99   sFT  0.99994987   -0 02 21.6
 HV2905;SPC VA N     - 2,136,630.544 3,624,695.242   MT  0.99995956   +0 53 49.4
 HV2905;SPC VA N     - 7,009,928.71 11,892,020.97   sFT  0.99995956   +0 53 49.4
 HV2905;UTM  18      - 4,306,456.388   321,102.182   MT  0.99999411   -1 17 43.1
 HV2905
 HV2905!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2905!SPC MD       -   1.00000413  x   0.99994987  =   0.99995399
 HV2905!SPC VA N     -   1.00000413  x   0.99995956  =   0.99996369
 HV2905!UTM  18      -   1.00000413  x   0.99999411  =   0.99999824
 HV2905
 HV2905:                Primary Azimuth Mark                     Grid Az
 HV2905:SPC MD       -  SW 149 DCDHT                             272 40 13.4
 HV2905:SPC VA N     -  SW 149 DCDHT                             271 44 02.4
 HV2905:UTM  18      -  SW 149 DCDHT                             273 55 34.9
 HV2905
 HV2905_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2110206456(NAD 83)
 HV2905
 HV2905|---------------------------------------------------------------------|
 HV2905| PID    Reference Object                     Distance      Geod. Az  |
 HV2905|                                                           dddmmss.s |
 HV2905| HV2173 SW 149 DCDHT                        441.678 METERS 2723751.8 |
 HV2905| HV1695 BOUNDARY WITNESS MK 6 DC VA         164.698 METERS 27532     |
 HV2905|---------------------------------------------------------------------|
 HV2905
 HV2905                          SUPERSEDED SURVEY CONTROL
 HV2905
 HV2905  NAD 83(1991)-  38 53 19.59798(N)    077 03 45.61543(W) AD(       ) 2
 HV2905  NAD 83(1986)-  38 53 19.59777(N)    077 03 45.62576(W) AD(       ) 2
 HV2905  NAD 27      -  38 53 19.19410(N)    077 03 46.70380(W) AD(       ) 2
 HV2905
 HV2905.Superseded values are not recommended for survey control.
 HV2905
 HV2905.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2905.See file dsdata.pdf to determine how the superseded data were derived.
 HV2905
 HV2905_MARKER: Z = SEE DESCRIPTION
 HV2905_SETTING: 0 = UNSPECIFIED SETTING
 HV2905
 HV2905  HISTORY     - Date     Condition        Report By
 HV2905  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2905  HISTORY     - 1966     GOOD             LOCENG
 HV2905
 HV2905                          STATION DESCRIPTION
 HV2905
 HV2905'DESCRIBED BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1966 (CJM)
 HV2905'STATION RECOVERED BY DELEUW CATHER CO
 HV2905'
 HV2905'PIPE AND TIES FOUND AS INDICATED BUT PIPE HAS NO DEFINITE
 HV2905'POINT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4716 ***********************************************************************
 HV4716  DESIGNATION -  S W 166 A 1960
 HV4716  PID         -  HV4716
 HV4716  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4716  COUNTRY     -  US
 HV4716  USGS QUAD   -  ALEXANDRIA (2019)
 HV4716
 HV4716                         *CURRENT SURVEY CONTROL
 HV4716  ______________________________________________________________________
 HV4716* NAD 83(1993) POSITION- 38 49 53.35218(N) 077 00 53.57498(W)   ADJUSTED
 HV4716* NAVD 88 ORTHO HEIGHT -    23.    (meters)       75.    (feet) SCALED
 HV4716  ______________________________________________________________________
 HV4716  GEOID HEIGHT    -        -32.217 (meters)                     GEOID18
 HV4716  LAPLACE CORR    -         -2.87  (seconds)                    DEFLEC18
 HV4716  HORZ ORDER      -  SECOND
 HV4716
 HV4716.The horizontal coordinates were established by classical geodetic methods
 HV4716.and adjusted by the National Geodetic Survey in November 1994.
 HV4716
 HV4716.The orthometric height was scaled from a topographic map.
 HV4716
 HV4716.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4716.GEOID18 height accuracy estimate available here.
 HV4716
 HV4716.Click photographs - Photos may exist for this station.
 HV4716
 HV4716.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4716
 HV4716. The following values were computed from the NAD 83(1993) position.
 HV4716
 HV4716;                    North         East     Units Scale Factor Converg.
 HV4716;SPC MD       -   129,299.928   398,707.843   MT  0.99995015   -0 00 33.6
 HV4716;SPC MD       -   424,211.51  1,308,093.98   sFT  0.99995015   -0 00 33.6
 HV4716;SPC VA N     - 2,130,337.618 3,628,943.655   MT  0.99995534   +0 55 36.8
 HV4716;SPC VA N     - 6,989,282.67 11,905,959.31   sFT  0.99995534   +0 55 36.8
 HV4716;UTM  18      - 4,300,005.429   325,106.963   MT  0.99997666   -1 15 49.4
 HV4716
 HV4716!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4716!SPC MD       -   1.00000149  x   0.99995015  =   0.99995164
 HV4716!SPC VA N     -   1.00000149  x   0.99995534  =   0.99995683
 HV4716!UTM  18      -   1.00000149  x   0.99997666  =   0.99997815
 HV4716
 HV4716_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2510600005(NAD 83)
 HV4716
 HV4716                          SUPERSEDED SURVEY CONTROL
 HV4716
 HV4716  NAD 83(1991)-  38 49 53.35075(N)    077 00 53.57625(W) AD(       ) 2
 HV4716  NAD 83(1986)-  38 49 53.35037(N)    077 00 53.58781(W) AD(       ) 2
 HV4716  NAD 27      -  38 49 52.94350(N)    077 00 54.66770(W) AD(       ) 2
 HV4716
 HV4716.Superseded values are not recommended for survey control.
 HV4716
 HV4716.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4716.See file dsdata.pdf to determine how the superseded data were derived.
 HV4716
 HV4716_MARKER: Z = SEE DESCRIPTION
 HV4716_SETTING: 0 = UNSPECIFIED SETTING
 HV4716_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4716
 HV4716  HISTORY     - Date     Condition        Report By
 HV4716  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4716  HISTORY     - 1965     MARK NOT FOUND   DCDHT
 HV4716
 HV4716                          STATION DESCRIPTION
 HV4716
 HV4716'DESCRIBED BY DC DEPARTMENT OF HIGHWAYS AND TRAFFIC 1965
 HV4716'STATION DESTROYED DUE TO CONSTRUCTION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4701 ***********************************************************************
 HV4701  DESIGNATION -  S W 166 B 1960
 HV4701  PID         -  HV4701
 HV4701  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4701  COUNTRY     -  US
 HV4701  USGS QUAD   -  ALEXANDRIA (2019)
 HV4701
 HV4701                         *CURRENT SURVEY CONTROL
 HV4701  ______________________________________________________________________
 HV4701* NAD 83(1993) POSITION- 38 50 21.10195(N) 077 00 32.81089(W)   ADJUSTED
 HV4701* NAVD 88 ORTHO HEIGHT -    23.    (meters)       75.    (feet) SCALED
 HV4701  ______________________________________________________________________
 HV4701  GEOID HEIGHT    -        -32.213 (meters)                     GEOID18
 HV4701  LAPLACE CORR    -         -2.74  (seconds)                    DEFLEC18
 HV4701  HORZ ORDER      -  SECOND
 HV4701
 HV4701.The horizontal coordinates were established by classical geodetic methods
 HV4701.and adjusted by the National Geodetic Survey in November 1994.
 HV4701
 HV4701.The orthometric height was scaled from a topographic map.
 HV4701
 HV4701.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4701.GEOID18 height accuracy estimate available here.
 HV4701
 HV4701.Click photographs - Photos may exist for this station.
 HV4701
 HV4701.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4701
 HV4701. The following values were computed from the NAD 83(1993) position.
 HV4701
 HV4701;                    North         East     Units Scale Factor Converg.
 HV4701;SPC MD       -   130,155.532   399,208.731   MT  0.99995005   -0 00 20.6
 HV4701;SPC MD       -   427,018.61  1,309,737.31   sFT  0.99995005   -0 00 20.6
 HV4701;SPC VA N     - 2,131,201.297 3,629,430.498   MT  0.99995585   +0 55 49.8
 HV4701;SPC VA N     - 6,992,116.26 11,907,556.56   sFT  0.99995585   +0 55 49.8
 HV4701;UTM  18      - 4,300,849.884   325,626.475   MT  0.99997443   -1 15 37.1
 HV4701
 HV4701!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4701!SPC MD       -   1.00000149  x   0.99995005  =   0.99995154
 HV4701!SPC VA N     -   1.00000149  x   0.99995585  =   0.99995734
 HV4701!UTM  18      -   1.00000149  x   0.99997443  =   0.99997592
 HV4701
 HV4701_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2562600849(NAD 83)
 HV4701
 HV4701                          SUPERSEDED SURVEY CONTROL
 HV4701
 HV4701  NAD 83(1991)-  38 50 21.10054(N)    077 00 32.81212(W) AD(       ) 2
 HV4701  NAD 83(1986)-  38 50 21.10010(N)    077 00 32.82353(W) AD(       ) 2
 HV4701  NAD 27      -  38 50 20.69380(N)    077 00 33.90450(W) AD(       ) 2
 HV4701
 HV4701.Superseded values are not recommended for survey control.
 HV4701
 HV4701.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4701.See file dsdata.pdf to determine how the superseded data were derived.
 HV4701
 HV4701_MARKER: Z = SEE DESCRIPTION
 HV4701_SETTING: 0 = UNSPECIFIED SETTING
 HV4701_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4701
 HV4701  HISTORY     - Date     Condition        Report By
 HV4701  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4701  HISTORY     - 1965     MARK NOT FOUND   DCDHT
 HV4701  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4701
 HV4701                          STATION DESCRIPTION
 HV4701
 HV4701'DESCRIBED BY DC DEPARTMENT OF HIGHWAYS AND TRAFFIC 1965
 HV4701'STATION DESTROYED DUE TO CONSTRUCTION.
 HV4701
 HV4701                          STATION RECOVERY (1971)
 HV4701
 HV4701'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4701'NEITHER THE STATION OR THE REFERENCE POINTS COULD BE
 HV4701'RECOVERED.  ROADS IN THE AREA HAVE BEEN CHANGED, APPARENTLY THE
 HV4701'STATION WAS DESTROYED.
 HV4701'
 HV4701'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4701'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4702 ***********************************************************************
 HV4702  DESIGNATION -  S W 168 B
 HV4702  PID         -  HV4702
 HV4702  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4702  COUNTRY     -  US
 HV4702  USGS QUAD   -  ALEXANDRIA (2019)
 HV4702
 HV4702                         *CURRENT SURVEY CONTROL
 HV4702  ______________________________________________________________________
 HV4702* NAD 83(1993) POSITION- 38 49 14.98553(N) 077 00 30.58831(W)   ADJUSTED
 HV4702* NAVD 88 ORTHO HEIGHT -    46.    (meters)      151.    (feet) SCALED
 HV4702  ______________________________________________________________________
 HV4702  GEOID HEIGHT    -        -32.247 (meters)                     GEOID18
 HV4702  LAPLACE CORR    -         -3.07  (seconds)                    DEFLEC18
 HV4702  HORZ ORDER      -  SECOND
 HV4702
 HV4702.The horizontal coordinates were established by classical geodetic methods
 HV4702.and adjusted by the National Geodetic Survey in November 1994.
 HV4702
 HV4702.The orthometric height was scaled from a topographic map.
 HV4702
 HV4702.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4702.GEOID18 height accuracy estimate available here.
 HV4702
 HV4702.Click photographs - Photos may exist for this station.
 HV4702
 HV4702.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4702
 HV4702. The following values were computed from the NAD 83(1993) position.
 HV4702
 HV4702;                    North         East     Units Scale Factor Converg.
 HV4702;SPC MD       -   128,116.814   399,262.141   MT  0.99995031   -0 00 19.2
 HV4702;SPC MD       -   420,329.91  1,309,912.54   sFT  0.99995031   -0 00 19.2
 HV4702;SPC VA N     - 2,129,163.714 3,629,517.212   MT  0.99995466   +0 55 51.1
 HV4702;SPC VA N     - 6,985,431.29 11,907,841.05   sFT  0.99995466   +0 55 51.1
 HV4702;UTM  18      - 4,298,810.436   325,635.244   MT  0.99997439   -1 15 33.9
 HV4702
 HV4702!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4702!SPC MD       -   0.99999788  x   0.99995031  =   0.99994819
 HV4702!SPC VA N     -   0.99999788  x   0.99995466  =   0.99995254
 HV4702!UTM  18      -   0.99999788  x   0.99997439  =   0.99997227
 HV4702
 HV4702:                Primary Azimuth Mark                     Grid Az
 HV4702:SPC MD       -  S E 168 A                                100 30 04.1
 HV4702:SPC VA N     -  S E 168 A                                099 33 53.8
 HV4702:UTM  18      -  S E 168 A                                101 45 18.8
 HV4702
 HV4702_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2563598810(NAD 83)
 HV4702
 HV4702|---------------------------------------------------------------------|
 HV4702| PID    Reference Object                     Distance      Geod. Az  |
 HV4702|                                                           dddmmss.s |
 HV4702| HV4723 S E 168 A                           APPROX. 0.8 KM 1002944.9 |
 HV4702| HV4700 S W 168 C                           226.148 METERS 25922     |
 HV4702|---------------------------------------------------------------------|
 HV4702
 HV4702                          SUPERSEDED SURVEY CONTROL
 HV4702
 HV4702  NAD 83(1991)-  38 49 14.98413(N)    077 00 30.58953(W) AD(       ) 2
 HV4702  NAD 83(1986)-  38 49 14.98360(N)    077 00 30.60141(W) AD(       ) 2
 HV4702  NAD 27      -  38 49 14.57580(N)    077 00 31.68280(W) AD(       ) 2
 HV4702
 HV4702.Superseded values are not recommended for survey control.
 HV4702
 HV4702.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4702.See file dsdata.pdf to determine how the superseded data were derived.
 HV4702
 HV4702_MARKER: Z = SEE DESCRIPTION
 HV4702_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4702
 HV4702  HISTORY     - Date     Condition        Report By
 HV4702  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4702  HISTORY     - 1971     GOOD             NGS
 HV4702
 HV4702                          STATION DESCRIPTION
 HV4702
 HV4702'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4702'STATION AND REFERENCE POINTS RECOVERED IN GOOD CONDITION.
 HV4702'
 HV4702'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4702'IN WASHINGTON D.C.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4700 ***********************************************************************
 HV4700  DESIGNATION -  S W 168 C
 HV4700  PID         -  HV4700
 HV4700  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4700  COUNTRY     -  US
 HV4700  USGS QUAD   -  ALEXANDRIA (2019)
 HV4700
 HV4700                         *CURRENT SURVEY CONTROL
 HV4700  ______________________________________________________________________
 HV4700* NAD 83(1993) POSITION- 38 49 13.63291(N) 077 00 39.80205(W)   ADJUSTED
 HV4700* NAVD 88 ORTHO HEIGHT -    47.    (meters)      154.    (feet) SCALED
 HV4700  ______________________________________________________________________
 HV4700  GEOID HEIGHT    -        -32.243 (meters)                     GEOID18
 HV4700  LAPLACE CORR    -         -3.07  (seconds)                    DEFLEC18
 HV4700  HORZ ORDER      -  SECOND
 HV4700
 HV4700.The horizontal coordinates were established by classical geodetic methods
 HV4700.and adjusted by the National Geodetic Survey in November 1994.
 HV4700
 HV4700.The orthometric height was scaled from a topographic map.
 HV4700
 HV4700.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4700.GEOID18 height accuracy estimate available here.
 HV4700
 HV4700.Click photographs - Photos may exist for this station.
 HV4700
 HV4700.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4700
 HV4700. The following values were computed from the NAD 83(1993) position.
 HV4700
 HV4700;                    North         East     Units Scale Factor Converg.
 HV4700;SPC MD       -   128,075.130   399,039.880   MT  0.99995031   -0 00 25.0
 HV4700;SPC MD       -   420,193.16  1,309,183.34   sFT  0.99995031   -0 00 25.0
 HV4700;SPC VA N     - 2,129,118.403 3,629,295.661   MT  0.99995464   +0 55 45.4
 HV4700;SPC VA N     - 6,985,282.63 11,907,114.18   sFT  0.99995464   +0 55 45.4
 HV4700;UTM  18      - 4,298,773.625   325,412.118   MT  0.99997535   -1 15 39.6
 HV4700
 HV4700!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4700!SPC MD       -   0.99999772  x   0.99995031  =   0.99994804
 HV4700!SPC VA N     -   0.99999772  x   0.99995464  =   0.99995237
 HV4700!UTM  18      -   0.99999772  x   0.99997535  =   0.99997308
 HV4700
 HV4700:                Primary Azimuth Mark                     Grid Az
 HV4700:SPC MD       -  S W 168 D 1960                           244 22 12.8
 HV4700:SPC VA N     -  S W 168 D 1960                           243 26 02.4
 HV4700:UTM  18      -  S W 168 D 1960                           245 37 27.4
 HV4700
 HV4700_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2541298773(NAD 83)
 HV4700
 HV4700|---------------------------------------------------------------------|
 HV4700| PID    Reference Object                     Distance      Geod. Az  |
 HV4700|                                                           dddmmss.s |
 HV4700| HV4702 S W 168 B                           226.148 METERS 07922     |
 HV4700| HV4718 S W 168 D 1960                      APPROX. 1.1 KM 2442147.8 |
 HV4700|---------------------------------------------------------------------|
 HV4700
 HV4700                          SUPERSEDED SURVEY CONTROL
 HV4700
 HV4700  NAD 83(1991)-  38 49 13.63150(N)    077 00 39.80330(W) AD(       ) 2
 HV4700  NAD 83(1986)-  38 49 13.63100(N)    077 00 39.81515(W) AD(       ) 2
 HV4700  NAD 27      -  38 49 13.22310(N)    077 00 40.89660(W) AD(       ) 2
 HV4700
 HV4700.Superseded values are not recommended for survey control.
 HV4700
 HV4700.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4700.See file dsdata.pdf to determine how the superseded data were derived.
 HV4700
 HV4700_MARKER: Z = SEE DESCRIPTION
 HV4700_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4700
 HV4700  HISTORY     - Date     Condition        Report By
 HV4700  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4700  HISTORY     - 1971     GOOD             NGS
 HV4700
 HV4700                          STATION DESCRIPTION
 HV4700
 HV4700'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4700'STATION RECOVERED IN GOOD CONDITION AND ALL REFERENCE POINTS
 HV4700'RECOVERED WITH THE EXCEPTION OF CROSSES CUT IN RIMS OF MANHOLES
 HV4700'IN STREET, WHICH HAVE BEEN WORN OFF.  FOLLOWING ARE SOME
 HV4700'MEASUREMENTS THAT WILL ASSIST IN RECOVERY.  3.15 FT. WEST OF
 HV4700'FACE OF CURB, 6.3 FEET SOUTH OF CENTER OF SEWER MANHOLE LID, 6.4
 HV4700'FEET NORTH-NORTHWEST OF SOUTH END OF IRON RIM ON DRAIN BASIN
 HV4700'ALONG CURB, 22.8 FEET NORTH OF PEPCO POLE NO. 796 359-7341, AND
 HV4700'27.2 FEET SOUTH OF TOP NUT ON A FIRE HYDRANT.
 HV4700'
 HV4700'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4700'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4718 ***********************************************************************
 HV4718  DESIGNATION -  S W 168 D 1960
 HV4718  PID         -  HV4718
 HV4718  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4718  COUNTRY     -  US
 HV4718  USGS QUAD   -  ALEXANDRIA (2019)
 HV4718
 HV4718                         *CURRENT SURVEY CONTROL
 HV4718  ______________________________________________________________________
 HV4718* NAD 83(1993) POSITION- 38 48 57.97341(N) 077 01 21.50450(W)   ADJUSTED
 HV4718* NAVD 88 ORTHO HEIGHT -     5.    (meters)       16.    (feet) SCALED
 HV4718  ______________________________________________________________________
 HV4718  GEOID HEIGHT    -        -32.233 (meters)                     GEOID18
 HV4718  LAPLACE CORR    -         -3.05  (seconds)                    DEFLEC18
 HV4718  HORZ ORDER      -  SECOND
 HV4718
 HV4718.The horizontal coordinates were established by classical geodetic methods
 HV4718.and adjusted by the National Geodetic Survey in November 1994.
 HV4718
 HV4718.The orthometric height was scaled from a topographic map.
 HV4718
 HV4718.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4718.GEOID18 height accuracy estimate available here.
 HV4718
 HV4718.Click photographs - Photos may exist for this station.
 HV4718
 HV4718.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4718
 HV4718. The following values were computed from the NAD 83(1993) position.
 HV4718
 HV4718;                    North         East     Units Scale Factor Converg.
 HV4718;SPC MD       -   127,592.453   398,033.797   MT  0.99995039   -0 00 51.2
 HV4718;SPC MD       -   418,609.57  1,305,882.55   sFT  0.99995039   -0 00 51.2
 HV4718;SPC VA N     - 2,128,619.349 3,628,297.595   MT  0.99995438   +0 55 19.4
 HV4718;SPC VA N     - 6,983,645.31 11,903,839.69   sFT  0.99995438   +0 55 19.4
 HV4718;UTM  18      - 4,298,313.069   324,395.686   MT  0.99997974   -1 16 05.4
 HV4718
 HV4718!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4718!SPC MD       -   1.00000431  x   0.99995039  =   0.99995470
 HV4718!SPC VA N     -   1.00000431  x   0.99995438  =   0.99995869
 HV4718!UTM  18      -   1.00000431  x   0.99997974  =   0.99998405
 HV4718
 HV4718:                Primary Azimuth Mark                     Grid Az
 HV4718:SPC MD       -  S W 168 C                                064 22 12.8
 HV4718:SPC VA N     -  S W 168 C                                063 26 02.2
 HV4718:UTM  18      -  S W 168 C                                065 37 27.0
 HV4718
 HV4718_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2439598313(NAD 83)
 HV4718
 HV4718|---------------------------------------------------------------------|
 HV4718| PID    Reference Object                     Distance      Geod. Az  |
 HV4718|                                                           dddmmss.s |
 HV4718| HV4700 S W 168 C                           APPROX. 1.1 KM 0642121.6 |
 HV4718|---------------------------------------------------------------------|
 HV4718
 HV4718                          SUPERSEDED SURVEY CONTROL
 HV4718
 HV4718  NAD 83(1991)-  38 48 57.97199(N)    077 01 21.50578(W) AD(       ) 2
 HV4718  NAD 83(1986)-  38 48 57.97162(N)    077 01 21.51765(W) AD(       ) 2
 HV4718  NAD 27      -  38 48 57.56390(N)    077 01 22.59660(W) AD(       ) 2
 HV4718
 HV4718.Superseded values are not recommended for survey control.
 HV4718
 HV4718.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4718.See file dsdata.pdf to determine how the superseded data were derived.
 HV4718
 HV4718_MARKER: Z = SEE DESCRIPTION
 HV4718_SETTING: 0 = UNSPECIFIED SETTING
 HV4718_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4718
 HV4718  HISTORY     - Date     Condition        Report By
 HV4718  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4718  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4718
 HV4718                          STATION DESCRIPTION
 HV4718
 HV4718'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4718'STATION WAS NOT RECOVERED.  APPARENTLY THE DIGESTION PITS HAVE
 HV4718'BEEN ENLARGED, AS THE SKETCH DOES NOT FIT THE AREA DESCRIBED.
 HV4718'
 HV4718'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4718'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4713 ***********************************************************************
 HV4713  DESIGNATION -  S W 168 E 1960
 HV4713  PID         -  HV4713
 HV4713  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4713  COUNTRY     -  US
 HV4713  USGS QUAD   -  ALEXANDRIA (2019)
 HV4713
 HV4713                         *CURRENT SURVEY CONTROL
 HV4713  ______________________________________________________________________
 HV4713* NAD 83(1993) POSITION- 38 49 21.23733(N) 077 00 59.46374(W)   ADJUSTED
 HV4713* NAVD 88 ORTHO HEIGHT -    15.    (meters)       49.    (feet) SCALED
 HV4713  ______________________________________________________________________
 HV4713  GEOID HEIGHT    -        -32.230 (meters)                     GEOID18
 HV4713  LAPLACE CORR    -         -3.01  (seconds)                    DEFLEC18
 HV4713  HORZ ORDER      -  SECOND
 HV4713
 HV4713.The horizontal coordinates were established by classical geodetic methods
 HV4713.and adjusted by the National Geodetic Survey in November 1994.
 HV4713
 HV4713.The orthometric height was scaled from a topographic map.
 HV4713
 HV4713.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4713.GEOID18 height accuracy estimate available here.
 HV4713
 HV4713.Click photographs - Photos may exist for this station.
 HV4713
 HV4713.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4713
 HV4713. The following values were computed from the NAD 83(1993) position.
 HV4713
 HV4713;                    North         East     Units Scale Factor Converg.
 HV4713;SPC MD       -   128,309.685   398,565.635   MT  0.99995028   -0 00 37.3
 HV4713;SPC MD       -   420,962.69  1,307,627.42   sFT  0.99995028   -0 00 37.3
 HV4713;SPC VA N     - 2,129,345.179 3,628,817.645   MT  0.99995477   +0 55 33.1
 HV4713;SPC VA N     - 6,986,026.64 11,905,545.89   sFT  0.99995477   +0 55 33.1
 HV4713;UTM  18      - 4,299,018.510   324,943.109   MT  0.99997737   -1 15 52.2
 HV4713
 HV4713!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4713!SPC MD       -   1.00000274  x   0.99995028  =   0.99995302
 HV4713!SPC VA N     -   1.00000274  x   0.99995477  =   0.99995751
 HV4713!UTM  18      -   1.00000274  x   0.99997737  =   0.99998011
 HV4713
 HV4713:                Primary Azimuth Mark                     Grid Az
 HV4713:SPC MD       -  S W 168 D 1960                           216 33 26.8
 HV4713:SPC VA N     -  S W 168 D 1960                           215 37 16.4
 HV4713:UTM  18      -  S W 168 D 1960                           217 48 41.7
 HV4713
 HV4713_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2494399018(NAD 83)
 HV4713
 HV4713|---------------------------------------------------------------------|
 HV4713| PID    Reference Object                     Distance      Geod. Az  |
 HV4713|                                                           dddmmss.s |
 HV4713| HV4718 S W 168 D 1960                      APPROX. 0.9 KM 2163249.5 |
 HV4713| HV4711 S W 168 F                           346.413 METERS 34655     |
 HV4713|---------------------------------------------------------------------|
 HV4713
 HV4713                          SUPERSEDED SURVEY CONTROL
 HV4713
 HV4713  NAD 83(1991)-  38 49 21.23589(N)    077 00 59.46505(W) AD(       ) 2
 HV4713  NAD 83(1986)-  38 49 21.23549(N)    077 00 59.47678(W) AD(       ) 2
 HV4713  NAD 27      -  38 49 20.82840(N)    077 01 00.55620(W) AD(       ) 2
 HV4713
 HV4713.Superseded values are not recommended for survey control.
 HV4713
 HV4713.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4713.See file dsdata.pdf to determine how the superseded data were derived.
 HV4713
 HV4713_MARKER: DS = TRIANGULATION STATION DISK
 HV4713_SETTING: 0 = UNSPECIFIED SETTING
 HV4713_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4713
 HV4713  HISTORY     - Date     Condition        Report By
 HV4713  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4713  HISTORY     - 1971     GOOD             NGS
 HV4713
 HV4713                          STATION DESCRIPTION
 HV4713
 HV4713'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4713'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV4713'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO S.W. 168-E
 HV4713'GROUTED IN CONCRETE.
 HV4713
 HV4713                          STATION RECOVERY (1971)
 HV4713
 HV4713'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4713'STATION RECOVERED IN GOOD CONDITION, REFERENCE POINTS RECOVERED
 HV4713'AS DESCRIBED.  THERE IS NO STAMPING ON THE STATION DISK.
 HV4713'
 HV4713'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4713'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4711 ***********************************************************************
 HV4711  DESIGNATION -  S W 168 F
 HV4711  PID         -  HV4711
 HV4711  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4711  COUNTRY     -  US
 HV4711  USGS QUAD   -  ALEXANDRIA (2019)
 HV4711
 HV4711                         *CURRENT SURVEY CONTROL
 HV4711  ______________________________________________________________________
 HV4711* NAD 83(1993) POSITION- 38 49 32.17953(N) 077 01 02.71451(W)   ADJUSTED
 HV4711* NAVD 88 ORTHO HEIGHT -    23.    (meters)       75.    (feet) SCALED
 HV4711  ______________________________________________________________________
 HV4711  GEOID HEIGHT    -        -32.223 (meters)                     GEOID18
 HV4711  LAPLACE CORR    -         -2.95  (seconds)                    DEFLEC18
 HV4711  HORZ ORDER      -  SECOND
 HV4711
 HV4711.The horizontal coordinates were established by classical geodetic methods
 HV4711.and adjusted by the National Geodetic Survey in November 1994.
 HV4711
 HV4711.The orthometric height was scaled from a topographic map.
 HV4711
 HV4711.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4711.GEOID18 height accuracy estimate available here.
 HV4711
 HV4711.Click photographs - Photos may exist for this station.
 HV4711
 HV4711.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4711
 HV4711. The following values were computed from the NAD 83(1993) position.
 HV4711
 HV4711;                    North         East     Units Scale Factor Converg.
 HV4711;SPC MD       -   128,647.104   398,487.285   MT  0.99995023   -0 00 39.4
 HV4711;SPC MD       -   422,069.71  1,307,370.37   sFT  0.99995023   -0 00 39.4
 HV4711;SPC VA N     - 2,129,681.274 3,628,733.792   MT  0.99995496   +0 55 31.1
 HV4711;SPC VA N     - 6,987,129.31 11,905,270.78   sFT  0.99995496   +0 55 31.1
 HV4711;UTM  18      - 4,299,357.572   324,872.161   MT  0.99997768   -1 15 54.5
 HV4711
 HV4711!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4711!SPC MD       -   1.00000149  x   0.99995023  =   0.99995172
 HV4711!SPC VA N     -   1.00000149  x   0.99995496  =   0.99995645
 HV4711!UTM  18      -   1.00000149  x   0.99997768  =   0.99997917
 HV4711
 HV4711_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2487299357(NAD 83)
 HV4711
 HV4711|---------------------------------------------------------------------|
 HV4711| PID    Reference Object                     Distance      Geod. Az  |
 HV4711|                                                           dddmmss.s |
 HV4711| HV2196 SW 166                              382.619 METERS 00108     |
 HV4711| HV4713 S W 168 E 1960                      346.413 METERS 16655     |
 HV4711|---------------------------------------------------------------------|
 HV4711
 HV4711                          SUPERSEDED SURVEY CONTROL
 HV4711
 HV4711  NAD 83(1991)-  38 49 32.17809(N)    077 01 02.71581(W) AD(       ) 2
 HV4711  NAD 83(1986)-  38 49 32.17770(N)    077 01 02.72749(W) AD(       ) 2
 HV4711  NAD 27      -  38 49 31.77070(N)    077 01 03.80680(W) AD(       ) 2
 HV4711
 HV4711.Superseded values are not recommended for survey control.
 HV4711
 HV4711.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4711.See file dsdata.pdf to determine how the superseded data were derived.
 HV4711
 HV4711_MARKER: Z = SEE DESCRIPTION
 HV4711_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4711
 HV4711  HISTORY     - Date     Condition        Report By
 HV4711  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4711  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4711
 HV4711                          STATION DESCRIPTION
 HV4711
 HV4711'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4711'THE REFERENCE POINTS WERE RECOVERED AS SHOWN ON SKETCH.  HOWEVER,
 HV4711'NO MEASUREMENTS WERE GIVEN TO STATION FROM REFERENCE POINTS.  THE
 HV4711'STATION WAS NOT RECOVERED.
 HV4711'
 HV4711'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4711'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4707 ***********************************************************************
 HV4707  DESIGNATION -  S W 2 1960
 HV4707  PID         -  HV4707
 HV4707  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4707  COUNTRY     -  US
 HV4707  USGS QUAD   -  ALEXANDRIA (2019)
 HV4707
 HV4707                         *CURRENT SURVEY CONTROL
 HV4707  ______________________________________________________________________
 HV4707* NAD 83(1993) POSITION- 38 52 13.70617(N) 077 00 43.61818(W)   ADJUSTED
 HV4707* NAVD 88 ORTHO HEIGHT -     5.    (meters)       16.    (feet) SCALED
 HV4707  ______________________________________________________________________
 HV4707  GEOID HEIGHT    -        -32.160 (meters)                     GEOID18
 HV4707  LAPLACE CORR    -         -3.13  (seconds)                    DEFLEC18
 HV4707  HORZ ORDER      -  SECOND
 HV4707
 HV4707.The horizontal coordinates were established by classical geodetic methods
 HV4707.and adjusted by the National Geodetic Survey in November 1994.
 HV4707
 HV4707.The orthometric height was scaled from a topographic map.
 HV4707
 HV4707.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4707.GEOID18 height accuracy estimate available here.
 HV4707
 HV4707.Click photographs - Photos may exist for this station.
 HV4707
 HV4707.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4707
 HV4707. The following values were computed from the NAD 83(1993) position.
 HV4707
 HV4707;                    North         East     Units Scale Factor Converg.
 HV4707;SPC MD       -   133,627.750   398,948.562   MT  0.99994985   -0 00 27.4
 HV4707;SPC MD       -   438,410.38  1,308,883.74   sFT  0.99994985   -0 00 27.4
 HV4707;SPC VA N     - 2,134,668.825 3,629,113.628   MT  0.99995811   +0 55 43.0
 HV4707;SPC VA N     - 7,003,492.64 11,906,516.96   sFT  0.99995811   +0 55 43.0
 HV4707;UTM  18      - 4,304,327.053   325,442.414   MT  0.99997522   -1 15 47.0
 HV4707
 HV4707!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4707!SPC MD       -   1.00000430  x   0.99994985  =   0.99995415
 HV4707!SPC VA N     -   1.00000430  x   0.99995811  =   0.99996241
 HV4707!UTM  18      -   1.00000430  x   0.99997522  =   0.99997952
 HV4707
 HV4707_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2544204327(NAD 83)
 HV4707
 HV4707|---------------------------------------------------------------------|
 HV4707| PID    Reference Object                     Distance      Geod. Az  |
 HV4707|                                                           dddmmss.s |
 HV4707| HV4705 S W 3 1960                          348.699 METERS 35801     |
 HV4707|---------------------------------------------------------------------|
 HV4707
 HV4707                          SUPERSEDED SURVEY CONTROL
 HV4707
 HV4707  NAD 83(1991)-  38 52 13.70475(N)    077 00 43.61934(W) AD(       ) 2
 HV4707  NAD 83(1986)-  38 52 13.70432(N)    077 00 43.63014(W) AD(       ) 2
 HV4707  NAD 27      -  38 52 13.30250(N)    077 00 44.71190(W) AD(       ) 2
 HV4707
 HV4707.Superseded values are not recommended for survey control.
 HV4707
 HV4707.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4707.See file dsdata.pdf to determine how the superseded data were derived.
 HV4707
 HV4707_MARKER: Z = SEE DESCRIPTION
 HV4707_SETTING: 0 = UNSPECIFIED SETTING
 HV4707_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4707
 HV4707  HISTORY     - Date     Condition        Report By
 HV4707  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4707  HISTORY     - 1971     GOOD             NGS
 HV4707
 HV4707                          STATION DESCRIPTION
 HV4707
 HV4707'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4707'STATION WAS RECOVERED AS SHOWN ON SKETCH OF DESCRIPTION.  IT IS
 HV4707'ALSO 8.3 FEET SOUTHWEST OF THE CENTER OF A MANHOLE COVER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4705 ***********************************************************************
 HV4705  DESIGNATION -  S W 3 1960
 HV4705  PID         -  HV4705
 HV4705  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4705  COUNTRY     -  US
 HV4705  USGS QUAD   -  ALEXANDRIA (2019)
 HV4705
 HV4705                         *CURRENT SURVEY CONTROL
 HV4705  ______________________________________________________________________
 HV4705* NAD 83(1993) POSITION- 38 52 25.00723(N) 077 00 44.11849(W)   ADJUSTED
 HV4705* NAVD 88 ORTHO HEIGHT -     6.    (meters)       20.    (feet) SCALED
 HV4705  ______________________________________________________________________
 HV4705  GEOID HEIGHT    -        -32.154 (meters)                     GEOID18
 HV4705  LAPLACE CORR    -         -3.13  (seconds)                    DEFLEC18
 HV4705  HORZ ORDER      -  SECOND
 HV4705
 HV4705.The horizontal coordinates were established by classical geodetic methods
 HV4705.and adjusted by the National Geodetic Survey in November 1994.
 HV4705
 HV4705.The orthometric height was scaled from a topographic map.
 HV4705
 HV4705.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4705.GEOID18 height accuracy estimate available here.
 HV4705
 HV4705.Click photographs - Photos may exist for this station.
 HV4705
 HV4705.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4705
 HV4705. The following values were computed from the NAD 83(1993) position.
 HV4705
 HV4705;                    North         East     Units Scale Factor Converg.
 HV4705;SPC MD       -   133,976.224   398,936.549   MT  0.99994985   -0 00 27.7
 HV4705;SPC MD       -   439,553.66  1,308,844.33   sFT  0.99994985   -0 00 27.7
 HV4705;SPC VA N     - 2,135,017.059 3,629,095.923   MT  0.99995835   +0 55 42.7
 HV4705;SPC VA N     - 7,004,635.13 11,906,458.87   sFT  0.99995835   +0 55 42.7
 HV4705;UTM  18      - 4,304,675.716   325,438.039   MT  0.99997524   -1 15 47.6
 HV4705
 HV4705!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4705!SPC MD       -   1.00000414  x   0.99994985  =   0.99995399
 HV4705!SPC VA N     -   1.00000414  x   0.99995835  =   0.99996249
 HV4705!UTM  18      -   1.00000414  x   0.99997524  =   0.99997938
 HV4705
 HV4705_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2543804675(NAD 83)
 HV4705
 HV4705                          SUPERSEDED SURVEY CONTROL
 HV4705
 HV4705  NAD 83(1991)-  38 52 25.00585(N)    077 00 44.11965(W) AD(       ) 2
 HV4705  NAD 83(1986)-  38 52 25.00539(N)    077 00 44.13040(W) AD(       ) 2
 HV4705  NAD 27      -  38 52 24.60360(N)    077 00 45.21220(W) AD(       ) 2
 HV4705
 HV4705.Superseded values are not recommended for survey control.
 HV4705
 HV4705.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4705.See file dsdata.pdf to determine how the superseded data were derived.
 HV4705
 HV4705_MARKER: DD = SURVEY DISK
 HV4705_SETTING: 35 = SET IN A MAT FOUNDATION OR CONCRETE SLAB OTHER THAN
 HV4705+WITH SETTING: PAVEMENT
 HV4705_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV4705+STABILITY: SURFACE MOTION
 HV4705
 HV4705  HISTORY     - Date     Condition        Report By
 HV4705  HISTORY     - 1960     MONUMENTED       MADHOP
 HV4705  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4705
 HV4705                          STATION DESCRIPTION
 HV4705
 HV4705'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4705'THIS STATION WAS DESTROYED WHEN A NEW SLAB WAS REPLACED IN THE
 HV4705'SIDEWALK.  MEASUREMENTS FROM REFERENCE POINTS CHECK TO A CROSS
 HV4705'CHISELED ON THE NEW SLAB OF THE SIDEWALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8292 ***********************************************************************
 HV8292  DESIGNATION -  SARGENT GPS E2
 HV8292  PID         -  HV8292
 HV8292  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8292  COUNTRY     -  US
 HV8292  USGS QUAD   -  WASHINGTON EAST (2016)
 HV8292
 HV8292                         *CURRENT SURVEY CONTROL
 HV8292  ______________________________________________________________________
 HV8292* NAD 83(2011) POSITION- 38 57 10.78933(N) 076 59 15.76763(W)   ADJUSTED
 HV8292* NAD 83(2011) ELLIP HT-    -0.063 (meters)        (06/27/12)   ADJUSTED
 HV8292* NAD 83(2011) EPOCH   -  2010.00
 HV8292* NAVD 88 ORTHO HEIGHT -    32.0   (meters)      105.    (feet) VERTCON3
 HV8292  ______________________________________________________________________
 HV8292  GEOID HEIGHT    -        -32.058 (meters)                     GEOID18
 HV8292  NAD 83(2011) X  -  1,118,281.770 (meters)                     COMP
 HV8292  NAD 83(2011) Y  - -4,839,075.866 (meters)                     COMP
 HV8292  NAD 83(2011) Z  -  3,988,260.461 (meters)                     COMP
 HV8292  LAPLACE CORR    -         -3.61  (seconds)                    DEFLEC18
 HV8292
 HV8292  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV8292  Standards:
 HV8292         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV8292            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV8292  -------------------------------------------------------------------
 HV8292  NETWORK    1.35   2.25           0.54   0.55   1.15     -0.28499852
 HV8292  -------------------------------------------------------------------
 HV8292  Click here for local accuracies and other accuracy information.
 HV8292
 HV8292.The horizontal coordinates were established by GPS observations
 HV8292.and adjusted by the National Geodetic Survey in June 2012.
 HV8292
 HV8292.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV8292.been affixed to the stable North American tectonic plate. See 
 HV8292.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV8292
 HV8292.The horizontal coordinates are valid at the epoch date displayed above
 HV8292.which is a decimal equivalence of Year/Month/Day.
 HV8292
 HV8292.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV8292.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV8292
 HV8292.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8292.GEOID18 height accuracy estimate available here.
 HV8292
 HV8292.Click photographs - Photos may exist for this station.
 HV8292
 HV8292.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV8292
 HV8292.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV8292
 HV8292.The ellipsoidal height was determined by GPS observations
 HV8292.and is referenced to NAD 83.
 HV8292
 HV8292. The following values were computed from the NAD 83(2011) position.
 HV8292
 HV8292;                    North         East     Units Scale Factor Converg.
 HV8292;SPC MD       -   142,788.498   401,065.010   MT  0.99995075   +0 00 27.8
 HV8292;SPC MD       -   468,465.26  1,315,827.45   sFT  0.99995075   +0 00 27.8
 HV8292;UTM  18      - 4,313,439.369   327,759.288   MT  0.99996532   -1 14 59.8
 HV8292
 HV8292!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV8292!SPC MD       -   1.00000001  x   0.99995075  =   0.99995076
 HV8292!UTM  18      -   1.00000001  x   0.99996532  =   0.99996533
 HV8292
 HV8292_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2775913439(NAD 83)
 HV8292
 HV8292                          SUPERSEDED SURVEY CONTROL
 HV8292
 HV8292  NAD 83(2007)-  38 57 10.78994(N)    076 59 15.76845(W) AD(2002.00) 0
 HV8292  ELLIP H (02/10/07)   -0.051  (m)                       GP(2002.00)    
 HV8292  ELLIP H (09/18/02)   -0.060  (m)                       GP(       ) 4 2
 HV8292  NAD 83(1993)-  38 57 10.79034(N)    076 59 15.76807(W) AD(       ) 1
 HV8292  ELLIP H (11/14/94)   -0.068  (m)                       GP(       ) 4 2
 HV8292  NAD 83(1991)-  38 57 10.78988(N)    076 59 15.76805(W) AD(       ) 1
 HV8292  NAD 83(1986)-  38 57 10.78854(N)    076 59 15.77881(W) AD(       ) 1
 HV8292  NGVD 29 (05/23/89)   32.2    (m)  RAPSU86  model used  GPS OBS        
 HV8292
 HV8292.Superseded values are not recommended for survey control.
 HV8292
 HV8292.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8292.See file dsdata.pdf to determine how the superseded data were derived.
 HV8292
 HV8292_MARKER: A = ALUMINUM MARKER
 HV8292_SETTING: 15 = METAL ROD DRIVEN INTO GROUND. SEE TEXT FOR ADDITIONAL
 HV8292+WITH SETTING: INFORMATION.
 HV8292_STAMPING: GPS E2
 HV8292_MARK LOGO: DEWDAV
 HV8292_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8292_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV8292+STABILITY: SURFACE MOTION
 HV8292_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV8292+SATELLITE: SATELLITE OBSERVATIONS - May 06, 2008
 HV8292
 HV8292  HISTORY     - Date     Condition        Report By
 HV8292  HISTORY     - 1988     MONUMENTED       DEWDAV
 HV8292  HISTORY     - 20030516 GOOD             DEWDAV
 HV8292  HISTORY     - 20040318 GOOD             GEOCAC
 HV8292  HISTORY     - 20080506 GOOD             NGS
 HV8292
 HV8292                          STATION DESCRIPTION
 HV8292
 HV8292'DESCRIBED BY DEWBERRY DAVIS 1988
 HV8292'THE STATION IS LOCATED NEAR THE MID POINT OF THE NORTHEAST BOUNDARY
 HV8292'BETWEEN THE DISTRICT OF COLUMBIA AND MARYLAND.
 HV8292'TO REACH THE STATION FROM THE INTERSECTION OF SOUTH DAKOTA AVENUE AND
 HV8292'SARGENT STREET, GO NORTH ON SARGENT STREET FOR 0.5 MILE TO GALLOWAY
 HV8292'ROAD, TURN RIGHT ON TO GALLOWAY ROAD AND GO EAST FOR APPROXIMATELY 150
 HV8292'FEET TO STATION ON RIGHT AT THE EDGE OF A FIELD.
 HV8292'THE STATION MARK IS A 2.5 INCH ALUMINUM DISK ATTATCHED TO A BERNTSEN
 HV8292'3-D MONUMENT AND STAMPED ---GPS-E2---SET IN A 5 INCH ROUND ALUMINUM
 HV8292'MONUMENT BOX, MARK RECESSED 0.5 FEET BELOW GROUND.  THE STATION IS 5
 HV8292'FEET SOUTH OF THE SOUTH EDGE OF PAVEMENT OF GALLOWAY ROAD OPPOSITE
 HV8292'HOUSE NUMBER 1318, AND APPROXIMATELY 150 FEET EAST OF THE EAST EDGE OF
 HV8292'PAVEMENT OF SARGENT ROAD.  THE STATION IS LOCATED BETWEEN TWO 4 INCH
 HV8292'SQUARE POSTS PROJECTING 4 FEET ABOVE GROUND.
 HV8292'REFERENCE MARK 1 IS PEPCO POLE NUMBER 803407-2572 NEAR THE CORNER OF
 HV8292'SARGENT AND GALLOWAY ROADS.  THE STATION IS  129.8 FEET  ESE FROM THE
 HV8292'POLE.
 HV8292'REFERENCE MARK 2 IS A PK NAIL SET IN PEPCO POLE NUMBER 803407-4075
 HV8292'LOCATED IN FRONT OF 1318 GALLOWAY ROAD.  THE STATION IS  46.08 FEET
 HV8292'SOUTH OF RM 2.
 HV8292'TO REACH THE AZIMUTH MARK, GO BACK TO THE INTERSECTION OF SARGENT AND
 HV8292'GALLOWAY ROADS, AND GO SOUTH ON SARGENT ROAD FOR 0.1 MILE TO
 HV8292'INTERSECTION OF SARGENT AND GALLATIN ROADS, TURN LEFT ON TO GALLATIN
 HV8292'ROAD AND GO EAST FOR 0.2 MILE TO STATION ON THE RIGHT.
 HV8292'THE AZIMUTH MARK IS AN UNSTAMPED 3.5 INCH METRO CONTROL SURVEY DISK
 HV8292'SET IN CONCRETE 8 INCHES BELOW GROUND PLACED IN A ROUND 6 INCH PVC
 HV8292'MONUMENT BOX.  THE MARK IS APPROXIMARELY 100 FEET EAST OF TH EAST EDGE
 HV8292'ON PAVEMENT OF 14TH STREET AND 3 FEET SOUTH OF THE SOUTH CURB OF
 HV8292'GALLATIN ROAD.  IT IS 5.55 FEET WEST OF PEPCO POLE NUMBER 804406-1098,
 HV8292'AND 25.27 FEET NORTH OF THE NORTHEAST CORNER OF THE HOUSE AT 5015
 HV8292'GALLATIN STREET.
 HV8292
 HV8292                          STATION RECOVERY (2003)
 HV8292
 HV8292'RECOVERY NOTE BY DEWBERRY DAVIS 2003 (KEC)
 HV8292'RECOVERED IN GOOD CONDITION.
 HV8292
 HV8292                          STATION RECOVERY (2004)
 HV8292
 HV8292'RECOVERY NOTE BY GEOCACHING 2004 (APC)
 HV8292'STATION DISK IS MORE DIRECTLY OPPOSITE 1316 GALLOWAY ROAD THAN 1318 AS
 HV8292'STATED IN THE 1988 DESCRIPTION. THE 4 FOOT TALL SQUARE POSTS MENTIONED
 HV8292'IN THAT DESCRIPTION WERE NOT OBSERVED.
 HV8292'
 HV8292'THE AZIMUTH MARK WAS NOT SEARCHED FOR.
 HV8292
 HV8292                          STATION RECOVERY (2008)
 HV8292
 HV8292'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DRD)
 HV8292'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4487 ***********************************************************************
 HV4487  DESIGNATION -  SCOTT
 HV4487  PID         -  HV4487
 HV4487  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4487  COUNTRY     -  US
 HV4487  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4487
 HV4487                         *CURRENT SURVEY CONTROL
 HV4487  ______________________________________________________________________
 HV4487* NAD 83(1993) POSITION- 38 56 25.94681(N) 077 00 40.06934(W)   ADJUSTED
 HV4487* NAVD 88 ORTHO HEIGHT -   127.4   (meters)      418.    (feet) VERTCON3
 HV4487  ______________________________________________________________________
 HV4487  GEOID HEIGHT    -        -32.031 (meters)                     GEOID18
 HV4487  LAPLACE CORR    -         -2.67  (seconds)                    DEFLEC18
 HV4487  HORZ ORDER      -  FIRST
 HV4487
 HV4487.The horizontal coordinates were established by classical geodetic methods
 HV4487.and adjusted by the National Geodetic Survey in November 1994.
 HV4487
 HV4487.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4487.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4487
 HV4487.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4487.GEOID18 height accuracy estimate available here.
 HV4487
 HV4487.Click photographs - Photos may exist for this station.
 HV4487
 HV4487.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4487
 HV4487. The following values were computed from the NAD 83(1993) position.
 HV4487
 HV4487;                    North         East     Units Scale Factor Converg.
 HV4487;SPC MD       -   141,405.729   399,035.057   MT  0.99995048   -0 00 25.1
 HV4487;SPC MD       -   463,928.63  1,309,167.52   sFT  0.99995048   -0 00 25.1
 HV4487;SPC VA N     - 2,142,447.264 3,629,073.024   MT  0.99996424   +0 55 45.2
 HV4487;SPC VA N     - 7,029,012.40 11,906,383.75   sFT  0.99996424   +0 55 45.2
 HV4487;UTM  18      - 4,312,101.457   325,699.439   MT  0.99997411   -1 15 51.6
 HV4487
 HV4487!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4487!SPC MD       -   0.99998504  x   0.99995048  =   0.99993552
 HV4487!SPC VA N     -   0.99998504  x   0.99996424  =   0.99994928
 HV4487!UTM  18      -   0.99998504  x   0.99997411  =   0.99995915
 HV4487
 HV4487:                Primary Azimuth Mark                     Grid Az
 HV4487:SPC MD       -  TAKOMA PARK PEPCO MICROWAVE              019 22 27.3
 HV4487:SPC VA N     -  TAKOMA PARK PEPCO MICROWAVE              018 26 17.0
 HV4487:UTM  18      -  TAKOMA PARK PEPCO MICROWAVE              020 37 53.8
 HV4487
 HV4487_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2569912101(NAD 83)
 HV4487
 HV4487|---------------------------------------------------------------------|
 HV4487| PID    Reference Object                     Distance      Geod. Az  |
 HV4487|                                                           dddmmss.s |
 HV4487| HV7748 TAKOMA PARK PEPCO MICROWAVE         APPROX. 3.4 KM 0192202.2 |
 HV4487| DC6958 SCOTT BLDG NE CORNER                  4.380 METERS 05356     |
 HV4487| HV4488 WASHINGTON IMM CON SHRINE TWR       APPROX. 1.2 KM 1335738.3 |
 HV4487| DC6974 SCOTT BLDG NW CORNER                 15.842 METERS 30012     |
 HV4487|---------------------------------------------------------------------|
 HV4487
 HV4487                          SUPERSEDED SURVEY CONTROL
 HV4487
 HV4487  NAD 83(1991)-  38 56 25.94617(N)    077 00 40.06999(W) AD(       ) 1
 HV4487  NAD 83(1986)-  38 56 25.94564(N)    077 00 40.08118(W) AD(       ) 1
 HV4487  NAD 27      -  38 56 25.54610(N)    077 00 41.16353(W) AD(       ) 1
 HV4487  NGVD 29 (07/19/86)  127.6    (m)          419.     (f) VERT ANG       
 HV4487
 HV4487.Superseded values are not recommended for survey control.
 HV4487
 HV4487.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4487.See file dsdata.pdf to determine how the superseded data were derived.
 HV4487
 HV4487_MARKER: DS = TRIANGULATION STATION DISK
 HV4487_SETTING: 0 = UNSPECIFIED SETTING
 HV4487
 HV4487  HISTORY     - Date     Condition        Report By
 HV4487  HISTORY     - 1970     MONUMENTED       NGS
 HV4487
 HV4487                          STATION DESCRIPTION
 HV4487
 HV4487'DESCRIBED BY NATIONAL GEODETIC SURVEY 1970 (JBJ)
 HV4487'THE STATION IS LOCATED ON THE ROOF OF THE WINFIELD SCOTT BUILDING
 HV4487'OF THE U.S. SOLDIERS HOME IN THE DISTRICT OF COLUMBIA.
 HV4487'
 HV4487'THE STATION MARK IS A STANDARD DISK, STAMPED SCOTT 1969, FIXED TO
 HV4487'THE ROOF WITH ROOFING COMPOUND UNDER A 6-INCH CYLINDRICAL COPPER
 HV4487'CAP, THAT PROJECTS 6 INCHES ABOVE THE ROOF.  IT IS 6.7 FEET
 HV4487'SOUTHWEST OF AN ANTENNA POLE AND 4.3 FEET NORTH OF THE NORTHWEST
 HV4487'CORNER OF THE ACCESS HATCHWAY TO THE ROOF.
 HV4487'
 HV4487'THE NW CORNER IS A CROSS ETCHED IN THE NORTHWEST CORNER OF THE WALL
 HV4487'OF THE BUILDING.
 HV4487'
 HV4487'THE NE CORNER IS A CROSS ETCHED IN THE NORTHEAST CORNER OF THE WALL
 HV4487'OF THE BUILDING.
 HV4487'
 HV4487'STATION HOME 1933 IS A CROSS ETCHED IN THE ROOF OF THE OLD SCOTT
 HV4487'BUILDING OF THE U.S. SOLDIERS HOME.  THE STATION WAS FOUND BY
 HV4487'MEASURING FROM TWO REFERENCES MARKS ON THAT BUILDING.  NO LOCAL
 HV4487'MEASUREMENTS WERE MADE TO REFERENCE THE STATION TO LOCAL OBJECTS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1475 ***********************************************************************
 HV1475  DESIGNATION -  SE 153 RESET
 HV1475  PID         -  HV1475
 HV1475  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1475  COUNTRY     -  US
 HV1475  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1475
 HV1475                         *CURRENT SURVEY CONTROL
 HV1475  ______________________________________________________________________
 HV1475* NAD 83(1993) POSITION- 38 52 42.47017(N) 076 59 29.10022(W)   ADJUSTED
 HV1475* NAVD 88 ORTHO HEIGHT -    17.53  (meters)       57.5   (feet) RESET
 HV1475  ______________________________________________________________________
 HV1475  GEOID HEIGHT    -        -32.180 (meters)                     GEOID18
 HV1475  LAPLACE CORR    -         -3.38  (seconds)                    DEFLEC18
 HV1475  HORZ ORDER      -  SECOND
 HV1475  VERT ORDER      -  THIRD
 HV1475
 HV1475.The horizontal coordinates were established by classical geodetic methods
 HV1475.and adjusted by the National Geodetic Survey in November 1994.
 HV1475
 HV1475.The orthometric height was computed from unverified reset data.
 HV1475
 HV1475.No vertical observational check was made to the station.
 HV1475
 HV1475.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1475.GEOID18 height accuracy estimate available here.
 HV1475
 HV1475.Click photographs - Photos may exist for this station.
 HV1475
 HV1475.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1475
 HV1475. The following values were computed from the NAD 83(1993) position.
 HV1475
 HV1475;                    North         East     Units Scale Factor Converg.
 HV1475;SPC MD       -   134,514.665   400,744.771   MT  0.99994985   +0 00 19.4
 HV1475;SPC MD       -   441,320.20  1,314,776.80   sFT  0.99994985   +0 00 19.4
 HV1475;SPC VA N     - 2,135,584.977 3,630,895.121   MT  0.99995873   +0 56 29.5
 HV1475;SPC VA N     - 7,006,498.38 11,912,361.74   sFT  0.99995873   +0 56 29.5
 HV1475;UTM  18      - 4,305,174.416   327,257.664   MT  0.99996745   -1 15 00.9
 HV1475
 HV1475!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1475!SPC MD       -   1.00000230  x   0.99994985  =   0.99995215
 HV1475!SPC VA N     -   1.00000230  x   0.99995873  =   0.99996103
 HV1475!UTM  18      -   1.00000230  x   0.99996745  =   0.99996975
 HV1475
 HV1475:                Primary Azimuth Mark                     Grid Az
 HV1475:SPC MD       -  S E 143 D 1960                           000 01 29.7
 HV1475:SPC VA N     -  S E 143 D 1960                           359 05 19.6
 HV1475:UTM  18      -  S E 143 D 1960                           001 16 50.0
 HV1475
 HV1475_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2725705174(NAD 83)
 HV1475
 HV1475|---------------------------------------------------------------------|
 HV1475| PID    Reference Object                     Distance      Geod. Az  |
 HV1475|                                                           dddmmss.s |
 HV1475| HV7702 S E 143 D 1960                      449.911 METERS 0000149.1 |
 HV1475| CX3700 SE 153 AZ MK                                       0894445.5 |
 HV1475| HV7701 S E 153 A 1960                      200.700 METERS 09008     |
 HV1475|---------------------------------------------------------------------|
 HV1475
 HV1475                          SUPERSEDED SURVEY CONTROL
 HV1475
 HV1475  NAD 83(1991)-  38 52 42.46885(N)    076 59 29.10138(W) AD(       ) 2
 HV1475  NAD 83(1986)-  38 52 42.46817(N)    076 59 29.11226(W) AD(       ) 2
 HV1475  NAD 27      -  38 52 42.06630(N)    076 59 30.19680(W) AD(       ) 2
 HV1475  NGVD 29 (??/??/??)   17.77   (m)           58.3    (f) RESET       3  
 HV1475  NGVD 29              17.76   (m)           58.3    (f) LEVELING    3  
 HV1475
 HV1475.Superseded values are not recommended for survey control.
 HV1475
 HV1475.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1475.See file dsdata.pdf to determine how the superseded data were derived.
 HV1475
 HV1475_MARKER: DD = SURVEY DISK
 HV1475_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1475_STAMPING: USCGS NO SE 153
 HV1475_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1475+STABILITY: SURFACE MOTION
 HV1475
 HV1475  HISTORY     - Date     Condition        Report By
 HV1475  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1475  HISTORY     - 1960     GOOD             MADHOP
 HV1475  HISTORY     - 1971     GOOD             NGS
 HV1475
 HV1475                          STATION DESCRIPTION
 HV1475
 HV1475'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1475'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1475'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. S.E. 153 SET
 HV1475'IN TOP OF A 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV1475'MANHOLE COVER WITH LID LABELED SURVEY.  SE 153 WAS LOWERED IN SAME
 HV1475'HORIZONTAL POSITION.
 HV1475'
 HV1475'AZIMUTH MARK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1475'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO SE 153-AZ. SET
 HV1475'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV1475'MANHOLE COVER WITH LID LABELED SURVEY.
 HV1475'
 HV1475'NO GEOGRAPHIC POSITION.
 HV1475
 HV1475                          STATION RECOVERY (1960)
 HV1475
 HV1475'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1475'IN DC.
 HV1475'LOCATED AT INTERSECTION OF 11TH ST. S.E. AND K ST. S.E. IN
 HV1475'NORTHEAST CORNER OF INTERSECTION,  13.92 FT SOUTHEAST OF CROSS
 HV1475'CUT IN MANHOLE RIM ADJACENT TO 11TH ST., AND 5.87 FT EAST OF CROSS
 HV1475'CUT IN MANHOLE RIM IN ROADWAY OF 11TH ST., AND 13.75 FT NORTH OF
 HV1475'CROSS CUT IN MANHOLE RIM IN ROADWAY OF K STREET.  A STANDARD
 HV1475'BRASS DISC SET IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY
 HV1475'A STANDARD MANHOLE COVER WITH LID LABELED SURVEY.
 HV1475
 HV1475                          STATION RECOVERY (1971)
 HV1475
 HV1475'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1475'THE STATION WAS RECOVERED.  IT IS PRESENTLY IN THE TRAFFIC LANE
 HV1475'OF THE NORTH BOUND TRAFFIC OF 11TH. ST. WHERE IT PASSES UNDER
 HV1475'BRIDGE FOR HIGHWAY I-695.  IT IS 17.3 FEET NORTH-NORTHWEST OF THE
 HV1475'TOP NUT OF A FIRE HYDRANT AND AT THE JUNCTION OF K ST. SE AND
 HV1475'11TH ST. SE.
 HV1475'
 HV1475'SE 153-AZ. WAS RECOVERED AS DESCRIBED AND IN GOOD CONDITION.  IT
 HV1475'IS ALSO 5.05 FEET NORTH-NORTHWEST OF STATION SE 153-A.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1463 ***********************************************************************
 HV1463  DESIGNATION -  SE 155 DCDHT RESET
 HV1463  PID         -  HV1463
 HV1463  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1463  COUNTRY     -  US
 HV1463  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1463
 HV1463                         *CURRENT SURVEY CONTROL
 HV1463  ______________________________________________________________________
 HV1463* NAD 83(1993) POSITION- 38 53 21.26930(N) 076 57 35.80641(W)   ADJUSTED
 HV1463* NAVD 88 ORTHO HEIGHT -    17.117 (meters)       56.16  (feet) ADJUSTED
 HV1463  ______________________________________________________________________
 HV1463  GEOID HEIGHT    -        -32.222 (meters)                     GEOID18
 HV1463  LAPLACE CORR    -         -3.65  (seconds)                    DEFLEC18
 HV1463  DYNAMIC HEIGHT  -         17.108 (meters)       56.13  (feet) COMP
 HV1463  MODELED GRAVITY -    980,093.0   (mgal)                       NAVD 88
 HV1463
 HV1463  HORZ ORDER      -  SECOND
 HV1463  VERT ORDER      -  SECOND    CLASS 0
 HV1463
 HV1463.The horizontal coordinates were established by classical geodetic methods
 HV1463.and adjusted by the National Geodetic Survey in November 1994.
 HV1463
 HV1463.The orthometric height was determined by differential leveling and
 HV1463.adjusted by the NATIONAL GEODETIC SURVEY
 HV1463.in June 1991.
 HV1463
 HV1463.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1463.GEOID18 height accuracy estimate available here.
 HV1463
 HV1463.Click photographs - Photos may exist for this station.
 HV1463
 HV1463.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1463
 HV1463.The dynamic height is computed by dividing the NAVD 88
 HV1463.geopotential number by the normal gravity value computed on the
 HV1463.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1463.degrees latitude (g = 980.6199 gals.).
 HV1463
 HV1463.The modeled gravity was interpolated from observed gravity values.
 HV1463
 HV1463. The following values were computed from the NAD 83(1993) position.
 HV1463
 HV1463;                    North         East     Units Scale Factor Converg.
 HV1463;SPC MD       -   135,711.782   403,474.943   MT  0.99994988   +0 01 30.5
 HV1463;SPC MD       -   445,247.74  1,323,734.04   sFT  0.99994988   +0 01 30.5
 HV1463;SPC VA N     - 2,136,826.549 3,633,605.397   MT  0.99995960   +0 57 40.2
 HV1463;SPC VA N     - 7,010,571.77 11,921,253.71   sFT  0.99995960   +0 57 40.2
 HV1463;UTM  18      - 4,306,311.424   330,013.449   MT  0.99995582   -1 13 50.8
 HV1463
 HV1463!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1463!SPC MD       -   1.00000237  x   0.99994988  =   0.99995225
 HV1463!SPC VA N     -   1.00000237  x   0.99995960  =   0.99996197
 HV1463!UTM  18      -   1.00000237  x   0.99995582  =   0.99995819
 HV1463
 HV1463:                Primary Azimuth Mark                     Grid Az
 HV1463:SPC MD       -  N E 146 D 1960                           048 35 12.1
 HV1463:SPC VA N     -  N E 146 D 1960                           047 39 02.4
 HV1463:UTM  18      -  N E 146 D 1960                           049 50 33.4
 HV1463
 HV1463_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3001306311(NAD 83)
 HV1463
 HV1463|---------------------------------------------------------------------|
 HV1463| PID    Reference Object                     Distance      Geod. Az  |
 HV1463|                                                           dddmmss.s |
 HV1463| HV7705 N E 146 D 1960                      APPROX. 0.5 KM 0483642.6 |
 HV1463| HV7674 S E 155 1960                          1.927 METERS 06842     |
 HV1463|---------------------------------------------------------------------|
 HV1463
 HV1463                          SUPERSEDED SURVEY CONTROL
 HV1463
 HV1463  NAD 83(1991)-  38 53 21.26797(N)    076 57 35.80755(W) AD(       ) 2
 HV1463  NAD 83(1986)-  38 53 21.26709(N)    076 57 35.81817(W) AD(       ) 2
 HV1463  NAD 27      -  38 53 20.86660(N)    076 57 36.90610(W) AD(       ) 2
 HV1463  NGVD 29 (??/??/??)   17.40   (m)           57.1    (f) RESET       3  
 HV1463  NGVD 29              17.39   (m)           57.1    (f) LEVELING    3  
 HV1463
 HV1463.Superseded values are not recommended for survey control.
 HV1463
 HV1463.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1463.See file dsdata.pdf to determine how the superseded data were derived.
 HV1463
 HV1463_MARKER: DD = SURVEY DISK
 HV1463_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1463_STAMPING: USCGS NO SE 155 RESET
 HV1463_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1463+STABILITY: SURFACE MOTION
 HV1463
 HV1463  HISTORY     - Date     Condition        Report By
 HV1463  HISTORY     - 1961     MONUMENTED       MADHOP
 HV1463  HISTORY     - 1961     GOOD             MADHOP
 HV1463  HISTORY     - 1971     GOOD             NGS
 HV1463
 HV1463                          STATION DESCRIPTION
 HV1463
 HV1463'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1961 (CJM)
 HV1463'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1463'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO SE 155-RESET
 HV1463'SET IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV1463'MANHOLE COVER WITH LID LABELED SURVEY.
 HV1463
 HV1463                          STATION RECOVERY (1961)
 HV1463
 HV1463'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1961
 HV1463'IN DC.
 HV1463'LOCATED ON BRIDGE ABOVE EAST CAPITOL ST. 6.20 FT SOUTH OF SOUTH
 HV1463'END OF WALK ON WEST SIDE OF BRIDGE, AND 54.81 FT SOUTH WEST OF X IN
 HV1463'SOUTHWEST CORNER OF CATCH BASIN ON EAST SIDE OF BRIDGE, AND 34.23
 HV1463'FT NORTHWEST OF X ON NORTHWEST CORNER OF CATCH BASIN SOUTH OF
 HV1463'PREVIOUS CATCH BASIN.  A STANDARD BRASS DISC SET IN TOP OF 12
 HV1463'IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH
 HV1463'LID LABELED SURVEY.
 HV1463
 HV1463                          STATION RECOVERY (1971)
 HV1463
 HV1463'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1463'THE STATION WAS RECOVERED.  HOWEVER, NOT AT THE LOCATION SHOWN
 HV1463'ON THE DESCRIPTION SKETCH.  THE DISK IS SET IN A DRILL HOLE ON
 HV1463'THE WALKWAY ALONG SOUTH BOUND TRAFFIC LANE, JUST NORTH OF AND
 HV1463'OPPOSITE A JOINT IN THE BRIDGE, AT A POINT ABOUT DIRECTLY OVER
 HV1463'THE SOUTH EDGE OF APPROACH RAMP LANE TO KENILWORTH AVE.  THE DISK
 HV1463'IS STAMPED RESET SE 155.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1479 ***********************************************************************
 HV1479  DESIGNATION -  SE 156 DCDHT
 HV1479  PID         -  HV1479
 HV1479  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1479  COUNTRY     -  US
 HV1479  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1479
 HV1479                         *CURRENT SURVEY CONTROL
 HV1479  ______________________________________________________________________
 HV1479* NAD 83(1993) POSITION- 38 53 02.97732(N) 076 56 50.86191(W)   ADJUSTED
 HV1479* NAVD 88 ORTHO HEIGHT -    56.595 (meters)      185.68  (feet) ADJUSTED
 HV1479  ______________________________________________________________________
 HV1479  GEOID HEIGHT    -        -32.252 (meters)                     GEOID18
 HV1479  LAPLACE CORR    -         -3.81  (seconds)                    DEFLEC18
 HV1479  DYNAMIC HEIGHT  -         56.565 (meters)      185.58  (feet) COMP
 HV1479  MODELED GRAVITY -    980,087.9   (mgal)                       NAVD 88
 HV1479
 HV1479  HORZ ORDER      -  SECOND
 HV1479  VERT ORDER      -  SECOND    CLASS 0
 HV1479
 HV1479.The horizontal coordinates were established by classical geodetic methods
 HV1479.and adjusted by the National Geodetic Survey in November 1994.
 HV1479
 HV1479.The orthometric height was determined by differential leveling and
 HV1479.adjusted by the NATIONAL GEODETIC SURVEY
 HV1479.in June 1991.
 HV1479
 HV1479.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1479.GEOID18 height accuracy estimate available here.
 HV1479
 HV1479.Click photographs - Photos may exist for this station.
 HV1479
 HV1479.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1479
 HV1479.The dynamic height is computed by dividing the NAVD 88
 HV1479.geopotential number by the normal gravity value computed on the
 HV1479.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1479.degrees latitude (g = 980.6199 gals.).
 HV1479
 HV1479.The modeled gravity was interpolated from observed gravity values.
 HV1479
 HV1479. The following values were computed from the NAD 83(1993) position.
 HV1479
 HV1479;                    North         East     Units Scale Factor Converg.
 HV1479;SPC MD       -   135,148.289   404,558.392   MT  0.99994986   +0 01 58.7
 HV1479;SPC MD       -   443,399.01  1,327,288.66   sFT  0.99994986   +0 01 58.7
 HV1479;SPC VA N     - 2,136,280.825 3,634,697.917   MT  0.99995919   +0 58 08.3
 HV1479;SPC VA N     - 7,008,781.34 11,924,838.08   sFT  0.99995919   +0 58 08.3
 HV1479;UTM  18      - 4,305,724.319   331,084.292   MT  0.99995135   -1 13 22.1
 HV1479
 HV1479!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1479!SPC MD       -   0.99999618  x   0.99994986  =   0.99994604
 HV1479!SPC VA N     -   0.99999618  x   0.99995919  =   0.99995537
 HV1479!UTM  18      -   0.99999618  x   0.99995135  =   0.99994753
 HV1479
 HV1479:                Primary Azimuth Mark                     Grid Az
 HV1479:SPC MD       -  S E 157 C 1960                           063 49 48.9
 HV1479:SPC VA N     -  S E 157 C 1960                           062 53 39.3
 HV1479:UTM  18      -  S E 157 C 1960                           065 05 09.7
 HV1479
 HV1479_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3108405724(NAD 83)
 HV1479
 HV1479|---------------------------------------------------------------------|
 HV1479| PID    Reference Object                     Distance      Geod. Az  |
 HV1479|                                                           dddmmss.s |
 HV1479| HV7658 S E 157 C 1960                      APPROX. 0.7 KM 0635147.6 |
 HV1479| HV7666 S E 156 A 1960                      215.588 METERS 15428     |
 HV1479|---------------------------------------------------------------------|
 HV1479
 HV1479                          SUPERSEDED SURVEY CONTROL
 HV1479
 HV1479  NAD 83(1991)-  38 53 02.97600(N)    076 56 50.86301(W) AD(       ) 2
 HV1479  NAD 83(1986)-  38 53 02.97501(N)    076 56 50.87376(W) AD(       ) 2
 HV1479  NAD 27      -  38 53 02.57470(N)    076 56 51.96220(W) AD(       ) 2
 HV1479  NGVD 29              56.83   (m)          186.4    (f) LEVELING    3  
 HV1479  NGVD 29 (11/26/84)   56.834  (m)          186.46   (f) ADJUSTED    2 0
 HV1479
 HV1479.Superseded values are not recommended for survey control.
 HV1479
 HV1479.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1479.See file dsdata.pdf to determine how the superseded data were derived.
 HV1479
 HV1479_MARKER: DD = SURVEY DISK
 HV1479_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1479_STAMPING: USCGS NO SE 156
 HV1479_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1479+STABILITY: SURFACE MOTION
 HV1479
 HV1479  HISTORY     - Date     Condition        Report By
 HV1479  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1479  HISTORY     - 1960     GOOD             MADHOP
 HV1479  HISTORY     - 1971     GOOD             NGS
 HV1479
 HV1479                          STATION DESCRIPTION
 HV1479
 HV1479'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1479'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1479'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO. S. E. 156 SET IN
 HV1479'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1479'COVER WITH LID LABELED SURVEY.
 HV1479
 HV1479                          STATION RECOVERY (1960)
 HV1479
 HV1479'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1479'IN DC.
 HV1479'LOCATED ADJACENT TO RIDGE RD. SE. AND THE ENTRANCE OT PARKING
 HV1479'FOR A TWO STORY BRICK APT. BUILDING NO. 428 AND 430.  18.86 FT
 HV1479'SOUTH OF CROSS CUT IN RIM OF MANHOLE, AND 50.61 FT WEST OF
 HV1479'SOUTH WEST CORNER OF APT. BUILDING.  A STANDARD BRASS DISC SET
 HV1479'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1479'COVER WITH LID LABELED SURVEY.
 HV1479
 HV1479                          STATION RECOVERY (1971)
 HV1479
 HV1479'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1479'STATION RECOVERED AS DESCRIBED.  THE SKETCH IS ADEQUATE WITH THE
 HV1479'FOLLOWING NOTATIONS--THE BUILDING REFERRED TO NO. 428 AND 430
 HV1479'IS A THREE STORY BRICK BUILDING AND NOT TWO STORY AS
 HV1479'DESCRIBED.  STATION IS ON THE NORTHEAST SIDE OF RIDGE ROAD,
 HV1479'BETWEEN D ST. AND ELY PL., ABOUT 162 FEET NORTHWEST OF CENTERLINE
 HV1479'OF ELY PL. SE, AT INTERSECTION OF RIDGE ROAD.
 HV1479'
 HV1479'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV1479'IN WASHINGTON, D. C.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1477 ***********************************************************************
 HV1477  DESIGNATION -  SE 157
 HV1477  PID         -  HV1477
 HV1477  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1477  COUNTRY     -  US
 HV1477  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1477
 HV1477                         *CURRENT SURVEY CONTROL
 HV1477  ______________________________________________________________________
 HV1477* NAD 83(1993) POSITION- 38 53 10.79693(N) 076 55 19.49491(W)   ADJUSTED
 HV1477* NAVD 88 ORTHO HEIGHT -    39.831 (meters)      130.68  (feet) ADJUSTED
 HV1477  ______________________________________________________________________
 HV1477  GEOID HEIGHT    -        -32.308 (meters)                     GEOID18
 HV1477  LAPLACE CORR    -         -4.67  (seconds)                    DEFLEC18
 HV1477  DYNAMIC HEIGHT  -         39.809 (meters)      130.61  (feet) COMP
 HV1477  MODELED GRAVITY -    980,082.1   (mgal)                       NAVD 88
 HV1477
 HV1477  HORZ ORDER      -  SECOND
 HV1477  VERT ORDER      -  SECOND    CLASS 0
 HV1477
 HV1477.The horizontal coordinates were established by classical geodetic methods
 HV1477.and adjusted by the National Geodetic Survey in November 1994.
 HV1477
 HV1477.The orthometric height was determined by differential leveling and
 HV1477.adjusted by the NATIONAL GEODETIC SURVEY
 HV1477.in June 1991.
 HV1477
 HV1477.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1477.GEOID18 height accuracy estimate available here.
 HV1477
 HV1477.Click photographs - Photos may exist for this station.
 HV1477
 HV1477.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1477
 HV1477.The dynamic height is computed by dividing the NAVD 88
 HV1477.geopotential number by the normal gravity value computed on the
 HV1477.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1477.degrees latitude (g = 980.6199 gals.).
 HV1477
 HV1477.The modeled gravity was interpolated from observed gravity values.
 HV1477
 HV1477. The following values were computed from the NAD 83(1993) position.
 HV1477
 HV1477;                    North         East     Units Scale Factor Converg.
 HV1477;SPC MD       -   135,390.984   406,760.210   MT  0.99994986   +0 02 56.1
 HV1477;SPC MD       -   444,195.25  1,334,512.46   sFT  0.99994986   +0 02 56.1
 HV1477;SPC VA N     - 2,136,559.456 3,636,895.497   MT  0.99995936   +0 59 05.3
 HV1477;SPC VA N     - 7,009,695.48 11,932,047.98   sFT  0.99995936   +0 59 05.3
 HV1477;UTM  18      - 4,305,918.700   333,290.893   MT  0.99994223   -1 12 24.9
 HV1477
 HV1477!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1477!SPC MD       -   0.99999882  x   0.99994986  =   0.99994868
 HV1477!SPC VA N     -   0.99999882  x   0.99995936  =   0.99995818
 HV1477!UTM  18      -   0.99999882  x   0.99994223  =   0.99994105
 HV1477
 HV1477:                Primary Azimuth Mark                     Grid Az
 HV1477:SPC MD       -  SE 157 AZ MK                             353 09 51.1
 HV1477:SPC VA N     -  SE 157 AZ MK                             352 13 41.9
 HV1477:UTM  18      -  SE 157 AZ MK                             354 25 12.1
 HV1477
 HV1477_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3329005918(NAD 83)
 HV1477
 HV1477|---------------------------------------------------------------------|
 HV1477| PID    Reference Object                     Distance      Geod. Az  |
 HV1477|                                                           dddmmss.s |
 HV1477| HV7646 S E 157 A 1960                      425.870 METERS 2775719.3 |
 HV1477| HV7648 S E 148 D 1960                      375.883 METERS 34810     |
 HV1477| CX3701 SE 157 AZ MK                                       3531247.2 |
 HV1477|---------------------------------------------------------------------|
 HV1477
 HV1477                          SUPERSEDED SURVEY CONTROL
 HV1477
 HV1477  NAD 83(1991)-  38 53 10.79560(N)    076 55 19.49601(W) AD(       ) 2
 HV1477  NAD 83(1986)-  38 53 10.79446(N)    076 55 19.50672(W) AD(       ) 2
 HV1477  NAD 27      -  38 53 10.39320(N)    076 55 20.60040(W) AD(       ) 2
 HV1477  NGVD 29              40.07   (m)          131.5    (f) LEVELING    3  
 HV1477  NGVD 29 (11/26/84)   40.068  (m)          131.46   (f) ADJUSTED    2 0
 HV1477
 HV1477.Superseded values are not recommended for survey control.
 HV1477
 HV1477.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1477.See file dsdata.pdf to determine how the superseded data were derived.
 HV1477
 HV1477_MARKER: DD = SURVEY DISK
 HV1477_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1477_STAMPING: USCGS NO SE 1957
 HV1477_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1477+STABILITY: SURFACE MOTION
 HV1477
 HV1477  HISTORY     - Date     Condition        Report By
 HV1477  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1477  HISTORY     - 1960     GOOD             MADHOP
 HV1477  HISTORY     - 1971     GOOD             NGS
 HV1477
 HV1477                          STATION DESCRIPTION
 HV1477
 HV1477'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1477'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1477'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO. SE 157 SET IN
 HV1477'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1477'COVER WITH LID LABELED SURVEY.
 HV1477'
 HV1477'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1477'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO SE 157-AZ. SET
 HV1477'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1477'COVER WITH LID LABELED SURVEY.
 HV1477'
 HV1477'NO GEOGRAPHIC POSITION.
 HV1477
 HV1477                          STATION RECOVERY (1960)
 HV1477
 HV1477'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1477'IN DC.
 HV1477'LOCATED AT INTERSECTION OF CENTRAL AVE. S.E. AND 55TH ST. S.E.
 HV1477'IN FRONT OF BUILDINGS 5441 AND 5443.  36.60 FT SOUTHEAST OF CROSS
 HV1477'CUT IN MANHOLE RIM IN ROADWAY OF CENTRAL AVE. S.E., AND 36.52
 HV1477'FT SOUTHEAST OF CROSS CUT IN MANHOLE RIM ADJACENT TO CENTRAL
 HV1477'AVE., AND 6.91 FT SOUTHWEST OF CROSS CUT IN MANHOLE RIM IN
 HV1477'SIDEWALK PARALLEL TO CENTRAL AVE. IN EAST INTERSECTION OF CONCRETE
 HV1477'WALKS.  A STANDARD BRASS DISC SET IN TOP OF 12 IN CONCRETE
 HV1477'MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID LABELED
 HV1477'SURVEY.
 HV1477
 HV1477                          STATION RECOVERY (1971)
 HV1477
 HV1477'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1477'STATION AND REFERENCE POINTS RECOVERED AS DESCRIBED, WITH THE
 HV1477'EXCEPTION THAT THE CROSS ON MANHOLE RIM IN STREET AREA HAS BEEN
 HV1477'WORN OFF BY TRAFFIC.  STATION IS IN GOOD CONDITION.
 HV1477'
 HV1477'SE 157 AZ.  THIS MARK WAS RECOVERED AS DESCRIBED AND FOUND TO BE
 HV1477'IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2194 ***********************************************************************
 HV2194  DESIGNATION -  SE 158 DCDHT
 HV2194  PID         -  HV2194
 HV2194  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2194  COUNTRY     -  US
 HV2194  USGS QUAD   -  ALEXANDRIA (2019)
 HV2194
 HV2194                         *CURRENT SURVEY CONTROL
 HV2194  ______________________________________________________________________
 HV2194* NAD 83(1993) POSITION- 38 51 46.91595(N) 077 00 07.23067(W)   ADJUSTED
 HV2194* NAVD 88 ORTHO HEIGHT -     3.924 (meters)       12.87  (feet) ADJUSTED
 HV2194  ______________________________________________________________________
 HV2194  GEOID HEIGHT    -        -32.188 (meters)                     GEOID18
 HV2194  LAPLACE CORR    -         -2.91  (seconds)                    DEFLEC18
 HV2194  DYNAMIC HEIGHT  -          3.921 (meters)       12.86  (feet) COMP
 HV2194  MODELED GRAVITY -    980,093.8   (mgal)                       NAVD 88
 HV2194
 HV2194  HORZ ORDER      -  SECOND
 HV2194  VERT ORDER      -  SECOND    CLASS 0
 HV2194
 HV2194.The horizontal coordinates were established by classical geodetic methods
 HV2194.and adjusted by the National Geodetic Survey in November 1994.
 HV2194
 HV2194.The orthometric height was determined by differential leveling and
 HV2194.adjusted by the NATIONAL GEODETIC SURVEY
 HV2194.in June 1991.
 HV2194
 HV2194.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2194.GEOID18 height accuracy estimate available here.
 HV2194
 HV2194.Click photographs - Photos may exist for this station.
 HV2194
 HV2194.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2194
 HV2194.The dynamic height is computed by dividing the NAVD 88
 HV2194.geopotential number by the normal gravity value computed on the
 HV2194.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2194.degrees latitude (g = 980.6199 gals.).
 HV2194
 HV2194.The modeled gravity was interpolated from observed gravity values.
 HV2194
 HV2194. The following values were computed from the NAD 83(1993) position.
 HV2194
 HV2194;                    North         East     Units Scale Factor Converg.
 HV2194;SPC MD       -   132,801.595   399,825.683   MT  0.99994987   -0 00 04.5
 HV2194;SPC MD       -   435,699.90  1,311,761.43   sFT  0.99994987   -0 00 04.5
 HV2194;SPC VA N     - 2,133,857.105 3,630,004.138   MT  0.99995754   +0 56 05.7
 HV2194;SPC VA N     - 7,000,829.52 11,909,438.58   sFT  0.99995754   +0 56 05.7
 HV2194;UTM  18      - 4,303,481.861   326,301.245   MT  0.99997154   -1 15 23.4
 HV2194
 HV2194!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2194!SPC MD       -   1.00000443  x   0.99994987  =   0.99995430
 HV2194!SPC VA N     -   1.00000443  x   0.99995754  =   0.99996197
 HV2194!UTM  18      -   1.00000443  x   0.99997154  =   0.99997597
 HV2194
 HV2194:                Primary Azimuth Mark                     Grid Az
 HV2194:SPC MD       -  S E 158 A 1960                           204 30 37.5
 HV2194:SPC VA N     -  S E 158 A 1960                           203 34 27.3
 HV2194:UTM  18      -  S E 158 A 1960                           205 45 56.4
 HV2194
 HV2194_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2630103481(NAD 83)
 HV2194
 HV2194|---------------------------------------------------------------------|
 HV2194| PID    Reference Object                     Distance      Geod. Az  |
 HV2194|                                                           dddmmss.s |
 HV2194| HV4697 S E 158 A 1960                      APPROX. 0.6 KM 2043033.0 |
 HV2194|---------------------------------------------------------------------|
 HV2194
 HV2194                          SUPERSEDED SURVEY CONTROL
 HV2194
 HV2194  NAD 83(1991)-  38 51 46.91458(N)    077 00 07.23183(W) AD(       ) 2
 HV2194  NAD 83(1986)-  38 51 46.91399(N)    077 00 07.24283(W) AD(       ) 2
 HV2194  NAD 27      -  38 51 46.51120(N)    077 00 08.32520(W) AD(       ) 2
 HV2194  NGVD 29               4.17   (m)           13.7    (f) LEVELING    3  
 HV2194  NGVD 29 (11/26/84)    4.166  (m)           13.67   (f) ADJUSTED    2 0
 HV2194
 HV2194.Superseded values are not recommended for survey control.
 HV2194
 HV2194.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2194.See file dsdata.pdf to determine how the superseded data were derived.
 HV2194
 HV2194_MARKER: DD = SURVEY DISK
 HV2194_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2194_SP_SET: MONUMENT
 HV2194_STAMPING: USCGS NO SE 158
 HV2194_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2194
 HV2194  HISTORY     - Date     Condition        Report By
 HV2194  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2194  HISTORY     - 1960     GOOD             MADHOP
 HV2194  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV2194
 HV2194                          STATION DESCRIPTION
 HV2194
 HV2194'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2194'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2194'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO S.E. 158 SET IN
 HV2194'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2194'COVER WITH LID LABELED SURVEY.
 HV2194
 HV2194                          STATION RECOVERY (1960)
 HV2194
 HV2194'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2194'IN WASHINGTON DC.
 HV2194'LOCATED ADJACENT TO ROAD WHICH RUNS NORTHWEST-SOUTHEAST OF SOUTH
 HV2194'CAPITOL ST. SOUTH OF SUITLAND PARKWAY.  EAST OF NAVAL AIR STATION.
 HV2194'30.08 FT NORTH OF CROSS ON LAMP POST BASE.  (SEE SE 163 FOR
 HV2194'ORIENTATION)  A STANDARD BRASS DISC SET IN TOP OF 12 IN CONCRETE
 HV2194'MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID LABELED
 HV2194'SURVEY.
 HV2194
 HV2194                          STATION RECOVERY (1971)
 HV2194
 HV2194'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2194'STATION WAS NOT RECOVERED, ROADS IN THE AREA HAVE BEEN CHANGED AND
 HV2194'WITH THE INADEQUATE DESCRIPTION THE STATION WILL BE VERY DIFFICULT
 HV2194'TO RECOVER IF IT STILL EXISTS.
 HV2194'
 HV2194'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2194'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1474 ***********************************************************************
 HV1474  DESIGNATION -  SE 159 DCDHT
 HV1474  PID         -  HV1474
 HV1474  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1474  COUNTRY     -  US
 HV1474  USGS QUAD   -  ANACOSTIA (2016)
 HV1474
 HV1474                         *CURRENT SURVEY CONTROL
 HV1474  ______________________________________________________________________
 HV1474* NAD 83(1993) POSITION- 38 52 12.36667(N) 076 59 21.96415(W)   ADJUSTED
 HV1474* NAVD 88 ORTHO HEIGHT -     7.460 (meters)       24.48  (feet) ADJUSTED
 HV1474  ______________________________________________________________________
 HV1474  GEOID HEIGHT    -        -32.198 (meters)                     GEOID18
 HV1474  LAPLACE CORR    -         -3.07  (seconds)                    DEFLEC18
 HV1474  DYNAMIC HEIGHT  -          7.456 (meters)       24.46  (feet) COMP
 HV1474  MODELED GRAVITY -    980,094.2   (mgal)                       NAVD 88
 HV1474
 HV1474  HORZ ORDER      -  SECOND
 HV1474  VERT ORDER      -  SECOND    CLASS 0
 HV1474
 HV1474.The horizontal coordinates were established by classical geodetic methods
 HV1474.and adjusted by the National Geodetic Survey in November 1994.
 HV1474
 HV1474.The orthometric height was determined by differential leveling and
 HV1474.adjusted by the NATIONAL GEODETIC SURVEY
 HV1474.in June 1991.
 HV1474
 HV1474.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1474.GEOID18 height accuracy estimate available here.
 HV1474
 HV1474.Click photographs - Photos may exist for this station.
 HV1474
 HV1474.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1474
 HV1474.The dynamic height is computed by dividing the NAVD 88
 HV1474.geopotential number by the normal gravity value computed on the
 HV1474.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1474.degrees latitude (g = 980.6199 gals.).
 HV1474
 HV1474.The modeled gravity was interpolated from observed gravity values.
 HV1474
 HV1474. The following values were computed from the NAD 83(1993) position.
 HV1474
 HV1474;                    North         East     Units Scale Factor Converg.
 HV1474;SPC MD       -   133,586.429   400,916.878   MT  0.99994985   +0 00 23.9
 HV1474;SPC MD       -   438,274.81  1,315,341.46   sFT  0.99994985   +0 00 23.9
 HV1474;SPC VA N     - 2,134,659.669 3,631,082.372   MT  0.99995808   +0 56 34.0
 HV1474;SPC VA N     - 7,003,462.60 11,912,976.08   sFT  0.99995808   +0 56 34.0
 HV1474;UTM  18      - 4,304,242.615   327,409.393   MT  0.99996681   -1 14 55.6
 HV1474
 HV1474!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1474!SPC MD       -   1.00000388  x   0.99994985  =   0.99995373
 HV1474!SPC VA N     -   1.00000388  x   0.99995808  =   0.99996196
 HV1474!UTM  18      -   1.00000388  x   0.99996681  =   0.99997069
 HV1474
 HV1474:                Primary Azimuth Mark                     Grid Az
 HV1474:SPC MD       -  S E 159 A 1960                           265 59 02.9
 HV1474:SPC VA N     -  S E 159 A 1960                           265 02 52.8
 HV1474:UTM  18      -  S E 159 A 1960                           267 14 22.4
 HV1474
 HV1474_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2740904242(NAD 83)
 HV1474
 HV1474|---------------------------------------------------------------------|
 HV1474| PID    Reference Object                     Distance      Geod. Az  |
 HV1474|                                                           dddmmss.s |
 HV1474| HV4725 S E 159 A 1960                      APPROX. 1.0 KM 2655926.8 |
 HV1474|---------------------------------------------------------------------|
 HV1474
 HV1474                          SUPERSEDED SURVEY CONTROL
 HV1474
 HV1474  NAD 83(1991)-  38 52 12.36533(N)    076 59 21.96531(W) AD(       ) 2
 HV1474  NAD 83(1986)-  38 52 12.36465(N)    076 59 21.97618(W) AD(       ) 2
 HV1474  NAD 27      -  38 52 11.96220(N)    076 59 23.06050(W) AD(       ) 2
 HV1474  NGVD 29               7.70   (m)           25.3    (f) LEVELING    3  
 HV1474  NGVD 29 (11/26/84)    7.702  (m)           25.27   (f) ADJUSTED    2 0
 HV1474
 HV1474.Superseded values are not recommended for survey control.
 HV1474
 HV1474.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1474.See file dsdata.pdf to determine how the superseded data were derived.
 HV1474
 HV1474_MARKER: DD = SURVEY DISK
 HV1474_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1474_STAMPING: USCGS NO SE
 HV1474_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1474+STABILITY: SURFACE MOTION
 HV1474
 HV1474  HISTORY     - Date     Condition        Report By
 HV1474  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1474  HISTORY     - 1960     GOOD             MADHOP
 HV1474  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV1474
 HV1474                          STATION DESCRIPTION
 HV1474
 HV1474'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1474'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1474'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO S.E. 159 SET
 HV1474'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV1474'MANHOLE LID LABELED SURVEY.
 HV1474
 HV1474                          STATION RECOVERY (1960)
 HV1474
 HV1474'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1474'IN DC.
 HV1474'LOCATED ADJACENT TO 11TH ST. NEAR BRIDGE WHICH CROSSES ANACOSTIA
 HV1474'RIVER, 49.35 FT WEST OF CROSS CUT IN MANHOLE RIM LOCATED ON
 HV1474'EAST SIDE OF 11TH ST. 24.11 FT SOUTHWEST OF CROSS  CUT IN MANHOLE
 HV1474'RIM LOCATED ON 11TH ST. BRIDGE, AND 3.87 FT NORTHEAST OF CROSS
 HV1474'CUT IN MANHOLE RIM ADJACENT TO 11TH ST.  A STANDARD BRASS DISC
 HV1474'SET IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV1474'MANHOLE LID LABELED SURVEY.
 HV1474
 HV1474                          STATION RECOVERY (1971)
 HV1474
 HV1474'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1474'NEITHER THE STATION OR ANY OF THE REFERENCE POINTS COULD BE
 HV1474'RECOVERED.  NEW BRIDGES HAVE BEEN PUT IN AT THIS SITE AND NO
 HV1474'EVIDENCE OF STATION OR REFERENCE POINTS REMAIN.
 HV1474'
 HV1474'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV1474'WASHINGTON, D.C.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1454 ***********************************************************************
 HV1454  DESIGNATION -  SE 160
 HV1454  PID         -  HV1454
 HV1454  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1454  COUNTRY     -  US
 HV1454  USGS QUAD   -  ANACOSTIA (2016)
 HV1454
 HV1454                         *CURRENT SURVEY CONTROL
 HV1454  ______________________________________________________________________
 HV1454* NAD 83(1993) POSITION- 38 51 35.81573(N) 076 58 02.12472(W)   ADJUSTED
 HV1454* NAVD 88 ORTHO HEIGHT -    84.934 (meters)      278.65  (feet) ADJUSTED
 HV1454  ______________________________________________________________________
 HV1454  GEOID HEIGHT    -        -32.248 (meters)                     GEOID18
 HV1454  LAPLACE CORR    -         -3.37  (seconds)                    DEFLEC18
 HV1454  DYNAMIC HEIGHT  -         84.888 (meters)      278.50  (feet) COMP
 HV1454  MODELED GRAVITY -    980,086.6   (mgal)                       NAVD 88
 HV1454
 HV1454  HORZ ORDER      -  SECOND
 HV1454  VERT ORDER      -  SECOND    CLASS 0
 HV1454
 HV1454.The horizontal coordinates were established by classical geodetic methods
 HV1454.and adjusted by the National Geodetic Survey in November 1994.
 HV1454
 HV1454.The orthometric height was determined by differential leveling and
 HV1454.adjusted by the NATIONAL GEODETIC SURVEY
 HV1454.in June 1991.
 HV1454
 HV1454.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1454.GEOID18 height accuracy estimate available here.
 HV1454
 HV1454.Click photographs - Photos may exist for this station.
 HV1454
 HV1454.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1454
 HV1454.The dynamic height is computed by dividing the NAVD 88
 HV1454.geopotential number by the normal gravity value computed on the
 HV1454.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1454.degrees latitude (g = 980.6199 gals.).
 HV1454
 HV1454.The modeled gravity was interpolated from observed gravity values.
 HV1454
 HV1454. The following values were computed from the NAD 83(1993) position.
 HV1454
 HV1454;                    North         East     Units Scale Factor Converg.
 HV1454;SPC MD       -   132,459.824   402,841.861   MT  0.99994989   +0 01 14.0
 HV1454;SPC MD       -   434,578.61  1,321,657.01   sFT  0.99994989   +0 01 14.0
 HV1454;SPC VA N     - 2,133,564.655 3,633,025.519   MT  0.99995731   +0 57 23.8
 HV1454;SPC VA N     - 6,999,870.04 11,919,351.22   sFT  0.99995731   +0 57 23.8
 HV1454;UTM  18      - 4,303,074.095   329,309.258   MT  0.99995878   -1 14 04.5
 HV1454
 HV1454!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1454!SPC MD       -   0.99999173  x   0.99994989  =   0.99994162
 HV1454!SPC VA N     -   0.99999173  x   0.99995731  =   0.99994904
 HV1454!UTM  18      -   0.99999173  x   0.99995878  =   0.99995051
 HV1454
 HV1454:                Primary Azimuth Mark                     Grid Az
 HV1454:SPC MD       -  SE 160 AZ MK                             214 26 10.4
 HV1454:SPC VA N     -  SE 160 AZ MK                             213 30 00.6
 HV1454:UTM  18      -  SE 160 AZ MK                             215 41 28.9
 HV1454
 HV1454_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2930903074(NAD 83)
 HV1454
 HV1454|---------------------------------------------------------------------|
 HV1454| PID    Reference Object                     Distance      Geod. Az  |
 HV1454|                                                           dddmmss.s |
 HV1454| HV7546 S E 161 D 1960                      460.832 METERS 0654021.2 |
 HV1454| CX3702 SE 160 AZ MK                                       2142724.4 |
 HV1454| HV7553 S E 160 A 1960                      376.214 METERS 21440     |
 HV1454|---------------------------------------------------------------------|
 HV1454
 HV1454                          SUPERSEDED SURVEY CONTROL
 HV1454
 HV1454  NAD 83(1991)-  38 51 35.81423(N)    076 58 02.12545(W) AD(       ) 2
 HV1454  NAD 83(1986)-  38 51 35.81356(N)    076 58 02.13678(W) AD(       ) 2
 HV1454  NAD 27      -  38 51 35.41360(N)    076 58 03.22910(W) AD(       ) 2
 HV1454  NGVD 29              85.18   (m)          279.5    (f) LEVELING    3  
 HV1454  NGVD 29 (11/26/84)   85.176  (m)          279.45   (f) ADJUSTED    2 0
 HV1454
 HV1454.Superseded values are not recommended for survey control.
 HV1454
 HV1454.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1454.See file dsdata.pdf to determine how the superseded data were derived.
 HV1454
 HV1454_MARKER: DD = SURVEY DISK
 HV1454_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1454_STAMPING: USCGS NO SE 160
 HV1454_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1454+STABILITY: SURFACE MOTION
 HV1454
 HV1454  HISTORY     - Date     Condition        Report By
 HV1454  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1454  HISTORY     - 1960     GOOD             MADHOP
 HV1454  HISTORY     - 1971     GOOD             NGS
 HV1454
 HV1454                          STATION DESCRIPTION
 HV1454
 HV1454'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1454'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1454'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO SE 160 SET
 HV1454'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV1454'MANHOLE COVER WITH LID LABELED SURVEY.
 HV1454'
 HV1454'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1454'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO SE 160-AZ. SET
 HV1454'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV1454'MANHOLE COVER WITH LID LABELED SURVEY.
 HV1454'
 HV1454'NO GEOGRAPHIC POSITION.
 HV1454
 HV1454                          STATION RECOVERY (1960)
 HV1454
 HV1454'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1454'AT WASHINGTON DC.
 HV1454'LOCATED AT THE Y INTERSECTION OF ALABAMA AVE S.E. AND GOOD HOPE
 HV1454'RD.  SEARS AND ROEBUCK IS ON THE EAST SIDE OF ALABAMA AVE.
 HV1454'33.10 FT SOUTHEAST OF CROSS CUT IN MANHOLE RIM ON GOOD HOPE RD.,
 HV1454'AND 37.74 FT NORTHWEST OF CROSS CUT IN MANHOLE RIM ON MEDIAN OF
 HV1454'ALABAMA AVE S.E.  A STANDARD BRASS DISC SET IN TOP OF 12 IN
 HV1454'CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH
 HV1454'LID LABELED SURVEY.
 HV1454
 HV1454                          STATION RECOVERY (1971)
 HV1454
 HV1454'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1454'THE AZIMUTH MARK WAS RECOVERED IN GOOD CONDITION AS DESCRIBED
 HV1454'WITH THE FOLLOWING EXCEPTIONS.  THE OLD CHURCH REFERENCED TO HAS
 HV1454'BEEN TORN DOWN AND A NEW CHURCH WAS BUILT IN 1966, THE AZIMUTH
 HV1454'MARK IS 39.8 FEET SOUTHEAST OF THE SOUTHEAST CORNER OF THE NEW
 HV1454'CHURCH BUILDING, 22.75 FEET SOUTH OF A CROSS CUT IN RIM OF
 HV1454'MANHOLE, AND 6.5 FEET WEST OF THE CENTER OF A MANHOLE COVER OF
 HV1454'THE BELL SYSTEM THAT IS IN THE STREET.
 HV1454'
 HV1454'STATION WAS RECOVERED AS DESCRIBED IN GOOD CONDITION.  HOWEVER,
 HV1454'THE SKETCH GIVEN ON DESCRIPTION IS IN-CORRECT AT PRESENT, SEE
 HV1454'SKETCH BELOW.
 HV1454'
 HV1454'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV1454'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1453 ***********************************************************************
 HV1453  DESIGNATION -  SE 161
 HV1453  PID         -  HV1453
 HV1453  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1453  COUNTRY     -  US
 HV1453  USGS QUAD   -  ANACOSTIA (2016)
 HV1453
 HV1453                         *CURRENT SURVEY CONTROL
 HV1453  ______________________________________________________________________
 HV1453* NAD 83(1993) POSITION- 38 51 56.17088(N) 076 57 03.81509(W)   ADJUSTED
 HV1453* NAVD 88 ORTHO HEIGHT -    84.168 (meters)      276.14  (feet) ADJUSTED
 HV1453  ______________________________________________________________________
 HV1453  GEOID HEIGHT    -        -32.269 (meters)                     GEOID18
 HV1453  LAPLACE CORR    -         -3.88  (seconds)                    DEFLEC18
 HV1453  DYNAMIC HEIGHT  -         84.122 (meters)      275.99  (feet) COMP
 HV1453  MODELED GRAVITY -    980,083.2   (mgal)                       NAVD 88
 HV1453
 HV1453  HORZ ORDER      -  SECOND
 HV1453  VERT ORDER      -  FIRST     CLASS I
 HV1453
 HV1453.The horizontal coordinates were established by classical geodetic methods
 HV1453.and adjusted by the National Geodetic Survey in November 1994.
 HV1453
 HV1453.The orthometric height was determined by differential leveling and
 HV1453.adjusted by the NATIONAL GEODETIC SURVEY
 HV1453.in June 1991.
 HV1453
 HV1453.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1453.GEOID18 height accuracy estimate available here.
 HV1453
 HV1453.Click photographs - Photos may exist for this station.
 HV1453
 HV1453.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1453
 HV1453.The dynamic height is computed by dividing the NAVD 88
 HV1453.geopotential number by the normal gravity value computed on the
 HV1453.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1453.degrees latitude (g = 980.6199 gals.).
 HV1453
 HV1453.The modeled gravity was interpolated from observed gravity values.
 HV1453
 HV1453. The following values were computed from the NAD 83(1993) position.
 HV1453
 HV1453;                    North         East     Units Scale Factor Converg.
 HV1453;SPC MD       -   133,088.111   404,247.313   MT  0.99994986   +0 01 50.6
 HV1453;SPC MD       -   436,639.91  1,326,268.06   sFT  0.99994986   +0 01 50.6
 HV1453;SPC VA N     - 2,134,215.823 3,634,420.531   MT  0.99995773   +0 58 00.2
 HV1453;SPC VA N     - 7,002,006.41 11,923,928.03   sFT  0.99995773   +0 58 00.2
 HV1453;UTM  18      - 4,303,671.447   330,728.146   MT  0.99995284   -1 13 28.5
 HV1453
 HV1453!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1453!SPC MD       -   0.99999186  x   0.99994986  =   0.99994172
 HV1453!SPC VA N     -   0.99999186  x   0.99995773  =   0.99994959
 HV1453!UTM  18      -   0.99999186  x   0.99995284  =   0.99994470
 HV1453
 HV1453:                Primary Azimuth Mark                     Grid Az
 HV1453:SPC MD       -  S E 161 A 1960                           246 36 18.9
 HV1453:SPC VA N     -  S E 161 A 1960                           245 40 09.3
 HV1453:UTM  18      -  S E 161 A 1960                           247 51 38.0
 HV1453
 HV1453_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3072803671(NAD 83)
 HV1453
 HV1453|---------------------------------------------------------------------|
 HV1453| PID    Reference Object                     Distance      Geod. Az  |
 HV1453|                                                           dddmmss.s |
 HV1453| HV7578 S E 162 D 1960                      136.677 METERS 03817     |
 HV1453| HV7556 S E 161 A 1960                      430.348 METERS 2463809.5 |
 HV1453| CX3703 SE 161 AZ MK                                       2470340.9 |
 HV1453|---------------------------------------------------------------------|
 HV1453
 HV1453                          SUPERSEDED SURVEY CONTROL
 HV1453
 HV1453  NAD 83(1991)-  38 51 56.16941(N)    076 57 03.81596(W) AD(       ) 2
 HV1453  NAD 83(1986)-  38 51 56.16860(N)    076 57 03.82712(W) AD(       ) 2
 HV1453  NAD 27      -  38 51 55.76910(N)    076 57 04.91630(W) AD(       ) 2
 HV1453  NGVD 29              84.41   (m)          276.9    (f) LEVELING    3  
 HV1453  NGVD 29 (11/26/84)   84.410  (m)          276.94   (f) ADJUSTED    1 1
 HV1453
 HV1453.Superseded values are not recommended for survey control.
 HV1453
 HV1453.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1453.See file dsdata.pdf to determine how the superseded data were derived.
 HV1453
 HV1453_STAMPING: USCGS NO SE 161
 HV1453_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1453+SATELLITE: SATELLITE OBSERVATIONS - May 17, 2002
 HV1453
 HV1453  HISTORY     - Date     Condition        Report By
 HV1453  HISTORY     - UNK      MONUMENTED       DCDHT
 HV1453  HISTORY     - 1960     GOOD             MADHOP
 HV1453  HISTORY     - 1960     GOOD             MADHOP
 HV1453  HISTORY     - 1971     GOOD             NGS
 HV1453  HISTORY     - 1971     GOOD             NGS
 HV1453  HISTORY     - 20020517 GOOD             WR
 HV1453  HISTORY     - 20191028 MARK NOT FOUND   ARCSHE
 HV1453
 HV1453                          STATION DESCRIPTION
 HV1453
 HV1453'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1453'AT WASHINGTON DC.
 HV1453'LOCATED AT INTERSECTION OF PENNSYLVANIA AVE. S.E. AND ALABAMA
 HV1453'AVE. S.E. IN NORTHEAST CORNER OF INTERSECTION.  22.07 FT
 HV1453'SOUTHEAST OF CROSS CUT IN MANHOLE RIM, AND 9.97 FT SOUTHEAST OF
 HV1453'CROSS CUT IN MANHOLE RIM, AND 11.75 FT NORTHWEST OF CROSS CUT IN
 HV1453'MANHOLE RIM.  A STANDARD BRASS DISC SET IN TOP OF A 12 IN
 HV1453'CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID
 HV1453'LABELED SURVEY.
 HV1453
 HV1453                          STATION RECOVERY (1960)
 HV1453
 HV1453'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1453'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1453'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO SE 161 SET
 HV1453'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV1453'MANHOLE COVER WITH LID LABELED SURVEY.
 HV1453'
 HV1453'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1453'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO SE 161-AZ. SET
 HV1453'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV1453'MANHOLE COVER WITH LID LABELED SURVEY.
 HV1453'
 HV1453'NO GEOGRAPHIC POSITION.
 HV1453
 HV1453                          STATION RECOVERY (1971)
 HV1453
 HV1453'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1453'THE STATION AND ALL REFERENCE POINTS RECOVERED IN GOOD
 HV1453'CONDITION.
 HV1453'
 HV1453'SE 161-AZ, RECOVERED IN GOOD CONDITION AS DESCRIBED.  ALL
 HV1453'REFERENCE POINTS RECOVERED AS GIVEN.
 HV1453'
 HV1453'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV1453'IN DIST. OF COL.
 HV1453
 HV1453                          STATION RECOVERY (1971)
 HV1453
 HV1453'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971
 HV1453'AT WASHINGTON.
 HV1453'AT WASHINGTON, D.C., ABOUT 1.6 MILES SOUTHEAST ALONG PENNSYLVANIA
 HV1453'AVENUE FROM THE SOUTHEAST END OF THE JOHN PHILIP SOUSA BRIDGE
 HV1453'OVER THE ANACOSTIA RIVER, ABOUT 0.25 MILE NORTHWEST OF THE
 HV1453'D.C. - MARYLAND BOUNDARY LINE, IN THE EAST ANGLE OF THE
 HV1453'INTERSECTION OF PENNSYLVANIA AND SE ALABAMA AVENUES, 15.6
 HV1453'FEET SOUTHEAST OF THE SOUTHEAST CURB OF PENNSYLVANIA AVENUE,
 HV1453'ABOUT 1/2 FOOT BELOW THE LEVEL OF THE SIDEWALK, AND IS A
 HV1453'DISTRICT OF COLUMBIA DEPARTMENT OF HIGHWAYS AND TRAFFIC CONTROL
 HV1453'DISK SET IN THE TOP OF A CONCRETE POST 6 INCHES BELOW THE
 HV1453'SIDEWALK, ACCESS TO WHICH IS HAD THROUGH A 1-FOOT SQUARE METAL
 HV1453'BOX WITH A METAL COVER.
 HV1453
 HV1453                          STATION RECOVERY (2002)
 HV1453
 HV1453'RECOVERY NOTE BY WHITMAN, REQUARDT & ASSOCIATES 2002 (FL)
 HV1453'RECOVERED IN GOOD CONDITION.
 HV1453
 HV1453                          STATION RECOVERY (2019)
 HV1453
 HV1453'RECOVERY NOTE BY ARCHER-SHEE LAND SURVEYING 2019 (MRA)
 HV1453'APPEARS TO BE NEW SIDEWALK IN THIS AREA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1478 ***********************************************************************
 HV1478  DESIGNATION -  SE 162 RESET
 HV1478  PID         -  HV1478
 HV1478  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1478  COUNTRY     -  US
 HV1478  USGS QUAD   -  ANACOSTIA (2016)
 HV1478
 HV1478                         *CURRENT SURVEY CONTROL
 HV1478  ______________________________________________________________________
 HV1478* NAD 83(1993) POSITION- 38 52 24.08644(N) 076 56 09.67992(W)   ADJUSTED
 HV1478* NAVD 88 ORTHO HEIGHT -    89.14  (meters)      292.5   (feet) RESET
 HV1478  ______________________________________________________________________
 HV1478  GEOID HEIGHT    -        -32.292 (meters)                     GEOID18
 HV1478  LAPLACE CORR    -         -4.41  (seconds)                    DEFLEC18
 HV1478  HORZ ORDER      -  SECOND
 HV1478  VERT ORDER      -  THIRD
 HV1478
 HV1478.The horizontal coordinates were established by classical geodetic methods
 HV1478.and adjusted by the National Geodetic Survey in November 1994.
 HV1478
 HV1478.The orthometric height was computed from unverified reset data.
 HV1478
 HV1478.No vertical observational check was made to the station.
 HV1478
 HV1478.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1478.GEOID18 height accuracy estimate available here.
 HV1478
 HV1478.Click photographs - Photos may exist for this station.
 HV1478
 HV1478.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1478
 HV1478. The following values were computed from the NAD 83(1993) position.
 HV1478
 HV1478;                    North         East     Units Scale Factor Converg.
 HV1478;SPC MD       -   133,949.705   405,551.754   MT  0.99994985   +0 02 24.6
 HV1478;SPC MD       -   439,466.66  1,330,547.71   sFT  0.99994985   +0 02 24.6
 HV1478;SPC VA N     - 2,135,098.617 3,635,710.734   MT  0.99995833   +0 58 34.0
 HV1478;SPC VA N     - 7,004,902.71 11,928,160.97   sFT  0.99995833   +0 58 34.0
 HV1478;UTM  18      - 4,304,504.256   332,051.150   MT  0.99994734   -1 12 55.2
 HV1478
 HV1478!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1478!SPC MD       -   0.99999108  x   0.99994985  =   0.99994093
 HV1478!SPC VA N     -   0.99999108  x   0.99995833  =   0.99994941
 HV1478!UTM  18      -   0.99999108  x   0.99994734  =   0.99993842
 HV1478
 HV1478:                Primary Azimuth Mark                     Grid Az
 HV1478:SPC MD       -  S E 156 C 1960                           304 56 56.5
 HV1478:SPC VA N     -  S E 156 C 1960                           304 00 47.1
 HV1478:UTM  18      -  S E 156 C 1960                           306 12 16.3
 HV1478
 HV1478_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3205104504(NAD 83)
 HV1478
 HV1478|---------------------------------------------------------------------|
 HV1478| PID    Reference Object                     Distance      Geod. Az  |
 HV1478|                                                           dddmmss.s |
 HV1478| HV7582 S E 162 A                           363.311 METERS 23630     |
 HV1478| HV7670 S E 156 C 1960                      APPROX. 0.8 KM 3045921.1 |
 HV1478| CX3704 SE 162 AZ MK                                       3053854.0 |
 HV1478|---------------------------------------------------------------------|
 HV1478
 HV1478                          SUPERSEDED SURVEY CONTROL
 HV1478
 HV1478  NAD 83(1991)-  38 52 24.08500(N)    076 56 09.68089(W) AD(       ) 2
 HV1478  NAD 83(1986)-  38 52 24.08405(N)    076 56 09.69189(W) AD(       ) 2
 HV1478  NAD 27      -  38 52 23.68520(N)    076 56 10.78140(W) AD(       ) 2
 HV1478  NGVD 29 (??/??/??)   89.37   (m)          293.2    (f) RESET       3  
 HV1478  NGVD 29              89.36   (m)          293.2    (f) LEVELING    3  
 HV1478
 HV1478.Superseded values are not recommended for survey control.
 HV1478
 HV1478.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1478.See file dsdata.pdf to determine how the superseded data were derived.
 HV1478
 HV1478_MARKER: DD = SURVEY DISK
 HV1478_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1478_STAMPING: USCGS NO SE 162 RESET
 HV1478_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1478+STABILITY: SURFACE MOTION
 HV1478
 HV1478  HISTORY     - Date     Condition        Report By
 HV1478  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1478  HISTORY     - 1960     GOOD             MADHOP
 HV1478  HISTORY     - 1971     GOOD             NGS
 HV1478
 HV1478                          STATION DESCRIPTION
 HV1478
 HV1478'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1478'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1478'DEPARTMENT OF HIGHWAYS AND TRAFFIC USC AND GS NO S.E. 162 RESET IN
 HV1478'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1478'COVER WITH LID LABELED SURVEY.  SE 162 WAS LOWERED IN SAME
 HV1478'HORIZONTAL POSITION.
 HV1478'
 HV1478'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1478'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO SE 162-AZ. SET
 HV1478'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1478'COVER WITH LID LABELED SURVEY.
 HV1478'
 HV1478'NO GEOGRAPHIC POSITION.
 HV1478
 HV1478                          STATION RECOVERY (1960)
 HV1478
 HV1478'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1478'IN DC.
 HV1478'LOCATED AT THE INTERSECTIONS OF BOWEN RD. S.E., RIDGE RD. S.E.,
 HV1478'AND 44TH PL. S.E.  IN SOUTHWEST CORNER OF INTERSECTION.  42.11
 HV1478'FT SOUTHWEST OF CROSS CUT IN RIM OF MANHOLE IN RIDGE RD - 44TH PL.
 HV1478'ROADWAY INTERSECTION, AND 16.28 FT WEST OF CROSS CUT IN RIM OF
 HV1478'MANHOLE IN BOWEN RD. ROADWAY AND 24.33 FT NORTHEAST OF CROSS
 HV1478'CUT IN RIM OF MANHOLE ON ISLAND.  A STANDARD BRASS DISC SET IN
 HV1478'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1478'COVER WITH LID LABELED SURVEY.
 HV1478
 HV1478                          STATION RECOVERY (1971)
 HV1478
 HV1478'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1478'STATION RECOVERED IN GOOD CONDITION AS DESCRIBED.  THE CHISELED
 HV1478'CROSSES ON MANHOLE RIMS IN STREETS HAVE BEEN WORN OFF BY TRAFFIC.
 HV1478'
 HV1478'SE 162-AZ.  STATION RECOVERED AS DESCRIBED AND AS SHOWN ON
 HV1478'SKETCH IN DESCRIPTION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2193 ***********************************************************************
 HV2193  DESIGNATION -  SE 163 DCDHT
 HV2193  PID         -  HV2193
 HV2193  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2193  COUNTRY     -  US
 HV2193  USGS QUAD   -  ALEXANDRIA (2019)
 HV2193
 HV2193                         *CURRENT SURVEY CONTROL
 HV2193  ______________________________________________________________________
 HV2193* NAD 83(1993) POSITION- 38 50 42.35019(N) 077 00 31.01220(W)   ADJUSTED
 HV2193* NAVD 88 ORTHO HEIGHT -    13.142 (meters)       43.12  (feet) ADJUSTED
 HV2193  ______________________________________________________________________
 HV2193  GEOID HEIGHT    -        -32.204 (meters)                     GEOID18
 HV2193  LAPLACE CORR    -         -2.61  (seconds)                    DEFLEC18
 HV2193  DYNAMIC HEIGHT  -         13.135 (meters)       43.09  (feet) COMP
 HV2193  MODELED GRAVITY -    980,091.3   (mgal)                       NAVD 88
 HV2193
 HV2193  HORZ ORDER      -  SECOND
 HV2193  VERT ORDER      -  SECOND    CLASS 0
 HV2193
 HV2193.The horizontal coordinates were established by classical geodetic methods
 HV2193.and adjusted by the National Geodetic Survey in November 1994.
 HV2193
 HV2193.The orthometric height was determined by differential leveling and
 HV2193.adjusted by the NATIONAL GEODETIC SURVEY
 HV2193.in June 1991.
 HV2193
 HV2193.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2193.GEOID18 height accuracy estimate available here.
 HV2193
 HV2193.Click photographs - Photos may exist for this station.
 HV2193
 HV2193.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2193
 HV2193.The dynamic height is computed by dividing the NAVD 88
 HV2193.geopotential number by the normal gravity value computed on the
 HV2193.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2193.degrees latitude (g = 980.6199 gals.).
 HV2193
 HV2193.The modeled gravity was interpolated from observed gravity values.
 HV2193
 HV2193. The following values were computed from the NAD 83(1993) position.
 HV2193
 HV2193;                    North         East     Units Scale Factor Converg.
 HV2193;SPC MD       -   130,810.723   399,252.170   MT  0.99994999   -0 00 19.5
 HV2193;SPC MD       -   429,168.18  1,309,879.83   sFT  0.99994999   -0 00 19.5
 HV2193;SPC VA N     - 2,131,857.114 3,629,463.226   MT  0.99995625   +0 55 50.9
 HV2193;SPC VA N     - 6,994,267.88 11,907,663.93   sFT  0.99995625   +0 55 50.9
 HV2193;UTM  18      - 4,301,503.982   325,684.251   MT  0.99997418   -1 15 36.6
 HV2193
 HV2193!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2193!SPC MD       -   1.00000299  x   0.99994999  =   0.99995298
 HV2193!SPC VA N     -   1.00000299  x   0.99995625  =   0.99995924
 HV2193!UTM  18      -   1.00000299  x   0.99997418  =   0.99997717
 HV2193
 HV2193:                Primary Azimuth Mark                     Grid Az
 HV2193:SPC MD       -  NATIONAL AIRPORT CONTROL TOWER           280 05 38.6
 HV2193:SPC VA N     -  NATIONAL AIRPORT CONTROL TOWER           279 09 28.2
 HV2193:UTM  18      -  NATIONAL AIRPORT CONTROL TOWER           281 20 55.7
 HV2193
 HV2193_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2568401503(NAD 83)
 HV2193
 HV2193|---------------------------------------------------------------------|
 HV2193| PID    Reference Object                     Distance      Geod. Az  |
 HV2193|                                                           dddmmss.s |
 HV2193| HV4703 S E 158 C 1960                      396.308 METERS 00546     |
 HV2193| HV4597 NATIONAL AIRPORT CONTROL TOWER      APPROX. 2.9 KM 2800519.1 |
 HV2193|---------------------------------------------------------------------|
 HV2193
 HV2193                          SUPERSEDED SURVEY CONTROL
 HV2193
 HV2193  NAD 83(1991)-  38 50 42.34877(N)    077 00 31.01342(W) AD(       ) 2
 HV2193  NAD 83(1986)-  38 50 42.34830(N)    077 00 31.02471(W) AD(       ) 2
 HV2193  NAD 27      -  38 50 41.94300(N)    077 00 32.10600(W) AD(       ) 2
 HV2193  NGVD 29              13.39   (m)           43.9    (f) LEVELING    3  
 HV2193  NGVD 29 (11/26/84)   13.386  (m)           43.92   (f) ADJUSTED    2 0
 HV2193
 HV2193.Superseded values are not recommended for survey control.
 HV2193
 HV2193.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2193.See file dsdata.pdf to determine how the superseded data were derived.
 HV2193
 HV2193_MARKER: DD = SURVEY DISK
 HV2193_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2193_SP_SET: MONUMENT
 HV2193_STAMPING: USCGS NO SE 163
 HV2193_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2193
 HV2193  HISTORY     - Date     Condition        Report By
 HV2193  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2193  HISTORY     - 1960     GOOD             MADHOP
 HV2193  HISTORY     - 1962     GOOD             CGS
 HV2193  HISTORY     - 1971     GOOD             NGS
 HV2193
 HV2193                          STATION DESCRIPTION
 HV2193
 HV2193'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2193'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2193'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO S.E. 163 SET IN
 HV2193'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2193'COVER WITH LID LABELED SURVEY.
 HV2193
 HV2193                          STATION RECOVERY (1960)
 HV2193
 HV2193'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2193'IN WASHINGTON DC.
 HV2193'LOCATED AT INTERSECTION OF S. CAPITOL ST. AND PORTLAND ST. S.W.
 HV2193'S. CAPITOL STREET TUNNELS BENEATH INTERSECTION.  MARK IS IN EAST
 HV2193'END OF ISLAND AT ENTRANCE TO BOLLING FIELD.  12.64 FT NORTHWEST
 HV2193'OF CROSS IN MANHOLE RIM, AND 5.72 FT SOUTHWEST OF CROSS IN MANHOLE
 HV2193'RIM.  A STANDARD BRASS DISC SET IN TOP OF 12 IN CONCRETE MONUMENT
 HV2193'SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID LABELED SURVEY.
 HV2193
 HV2193                          STATION RECOVERY (1962)
 HV2193
 HV2193'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1962 (CEO)
 HV2193'STATION S.E. 163 WAS RECOVERED AS DESCRIBED.  HOWEVER, THE
 HV2193'AZIMUTH MARK, STATION S.E. 158 WAS TO BE DESTROYED BY
 HV2193'CONSTRUCTION.  THE MAIN ANTENNAE ON THE ROOF (CENTERED) OF THE
 HV2193'WASHINGTON NATIONAL CONTROL TOWER WAS OBSERVED FOR AZIMUTH.
 HV2193
 HV2193                          STATION RECOVERY (1971)
 HV2193
 HV2193'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2193'STATION RECOVERED IN GOOD CONDITION.  THE REFERENCE, CHISELED
 HV2193'CROSSES, ON RIMS OF MANHOLE RIMS HAVE BEEN WORN OFF, HOWEVER, THE
 HV2193'MANHOLES REMAIN IN POSITION.  THE STATION IS 3-INCHES UNDER
 HV2193'SURFACE OF GROUND, 4 FEET NORTH OF THE CENTER OF A SIGNAL LAMP
 HV2193'POST, AND 1.5 FEET IN FROM THE CURB.
 HV2193'
 HV2193'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2193'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1456 ***********************************************************************
 HV1456  DESIGNATION -  SE 164 RESET
 HV1456  PID         -  HV1456
 HV1456  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1456  COUNTRY     -  US
 HV1456  USGS QUAD   -  ANACOSTIA (2016)
 HV1456
 HV1456                         *CURRENT SURVEY CONTROL
 HV1456  ______________________________________________________________________
 HV1456* NAD 83(1993) POSITION- 38 50 37.11856(N) 076 59 38.62846(W)   ADJUSTED
 HV1456* NAVD 88 ORTHO HEIGHT -    53.58  (meters)      175.8   (feet) RESET
 HV1456  ______________________________________________________________________
 HV1456  GEOID HEIGHT    -        -32.227 (meters)                     GEOID18
 HV1456  LAPLACE CORR    -         -2.94  (seconds)                    DEFLEC18
 HV1456  HORZ ORDER      -  SECOND
 HV1456  VERT ORDER      -  THIRD
 HV1456
 HV1456.The horizontal coordinates were established by classical geodetic methods
 HV1456.and adjusted by the National Geodetic Survey in November 1994.
 HV1456
 HV1456.The orthometric height was computed from unverified reset data.
 HV1456
 HV1456.No vertical observational check was made to the station.
 HV1456
 HV1456.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1456.GEOID18 height accuracy estimate available here.
 HV1456
 HV1456.Click photographs - Photos may exist for this station.
 HV1456
 HV1456.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1456
 HV1456. The following values were computed from the NAD 83(1993) position.
 HV1456
 HV1456;                    North         East     Units Scale Factor Converg.
 HV1456;SPC MD       -   130,649.386   400,515.365   MT  0.99995000   +0 00 13.4
 HV1456;SPC MD       -   428,638.86  1,314,024.16   sFT  0.99995000   +0 00 13.4
 HV1456;SPC VA N     - 2,131,716.437 3,630,728.897   MT  0.99995615   +0 56 23.6
 HV1456;SPC VA N     - 6,993,806.34 11,911,816.39   sFT  0.99995615   +0 56 23.6
 HV1456;UTM  18      - 4,301,315.019   326,943.638   MT  0.99996879   -1 15 03.5
 HV1456
 HV1456!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1456!SPC MD       -   0.99999665  x   0.99995000  =   0.99994665
 HV1456!SPC VA N     -   0.99999665  x   0.99995615  =   0.99995280
 HV1456!UTM  18      -   0.99999665  x   0.99996879  =   0.99996544
 HV1456
 HV1456:                Primary Azimuth Mark                     Grid Az
 HV1456:SPC MD       -  S E 165 A 1960                           077 42 05.8
 HV1456:SPC VA N     -  S E 165 A 1960                           076 45 55.6
 HV1456:UTM  18      -  S E 165 A 1960                           078 57 22.7
 HV1456
 HV1456_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2694301315(NAD 83)
 HV1456
 HV1456|---------------------------------------------------------------------|
 HV1456| PID    Reference Object                     Distance      Geod. Az  |
 HV1456|                                                           dddmmss.s |
 HV1456| CX3705 SE 164 AZ MK                                       0732156.1 |
 HV1456| HV7562 S E 165 A 1960                      APPROX. 0.5 KM 0774219.2 |
 HV1456| HV7571 S E 164 A 1960                      181.395 METERS 17840     |
 HV1456|---------------------------------------------------------------------|
 HV1456
 HV1456                          SUPERSEDED SURVEY CONTROL
 HV1456
 HV1456  NAD 83(1991)-  38 50 37.11695(N)    076 59 38.62935(W) AD(       ) 2
 HV1456  NAD 83(1986)-  38 50 37.11657(N)    076 59 38.64045(W) AD(       ) 2
 HV1456  NAD 27      -  38 50 36.71430(N)    076 59 39.73340(W) AD(       ) 2
 HV1456  NGVD 29 (??/??/??)   53.82   (m)          176.6    (f) RESET       3  
 HV1456  NGVD 29              53.81   (m)          176.5    (f) LEVELING    3  
 HV1456
 HV1456.Superseded values are not recommended for survey control.
 HV1456
 HV1456.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1456.See file dsdata.pdf to determine how the superseded data were derived.
 HV1456
 HV1456_MARKER: DD = SURVEY DISK
 HV1456_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1456_STAMPING: USGS NO SE 164 RESET
 HV1456_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1456+STABILITY: SURFACE MOTION
 HV1456
 HV1456  HISTORY     - Date     Condition        Report By
 HV1456  HISTORY     - 1960     MONUMENTED       MADHOP
 HV1456  HISTORY     - 1961     GOOD             MADHOP
 HV1456  HISTORY     - 1971     GOOD             NGS
 HV1456
 HV1456                          STATION DESCRIPTION
 HV1456
 HV1456'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV1456'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1456'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO SE 164 RESET
 HV1456'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV1456'MANHOLE COVER WITH LID LABELED SURVEY.
 HV1456'
 HV1456'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1456'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO SE 164-AZ. SET
 HV1456'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV1456'MANHOLE COVER WITH LID LABELED SURVEY.
 HV1456'
 HV1456'NO GEOGRAPHIC POSITION.
 HV1456
 HV1456                          STATION RECOVERY (1961)
 HV1456
 HV1456'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1961
 HV1456'AT WASHINGTON DC.
 HV1456'LOCATED NEAR THE INTERSECTION OF ALABAMA AVE. S.E. AND WHEELER
 HV1456'RD 21.37 FT NORTHEAST OF NAIL AND WASHER IN 15 IN MAPLE TREE
 HV1456'ADJACENT TO WHEELER RD., AND 18.13 FT SOUTHEAST OF X CUT IN GAS
 HV1456'VALVE RIM IN ROADWAY OF ALABAMA AVE., AND 31.18 FT NORTHWEST OF
 HV1456'X CUT IN MANHOLE RIM ON SIDEWALK PARALLELING ALABAMA AVE.  A
 HV1456'STANDARD BRASS DISC SET IN TOP OF 12 IN CONCRETE MONUMENT
 HV1456'SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID LABELED SURVEY.
 HV1456
 HV1456                          STATION RECOVERY (1971)
 HV1456
 HV1456'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1456'STATION AND REFERENCE POINTS RECOVERED IN GOOD CONDITION, WITH
 HV1456'THE EXCEPTION OF REFERENCE POINT REFERRED TO AS NAIL AND WASHER IN
 HV1456'15-INCH MAPLE TREE.
 HV1456'
 HV1456'SE 164-AZ.  THIS MARKER WAS RECOVERED IN GOOD CONDITION AND ALL
 HV1456'REFERENCE POINTS RECOVERED AS DESCRIBED WITH THE EXCEPTION OF NAIL
 HV1456'AND WASHER IN 12-INCH ELM TREE TO THE WEST OF STATION, THE TREE
 HV1456'IS GONE.
 HV1456'
 HV1456'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV1456'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1455 ***********************************************************************
 HV1455  DESIGNATION -  SE 165
 HV1455  PID         -  HV1455
 HV1455  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1455  COUNTRY     -  US
 HV1455  USGS QUAD   -  ANACOSTIA (2016)
 HV1455
 HV1455                         *CURRENT SURVEY CONTROL
 HV1455  ______________________________________________________________________
 HV1455* NAD 83(1993) POSITION- 38 50 48.49409(N) 076 58 49.42031(W)   ADJUSTED
 HV1455* NAVD 88 ORTHO HEIGHT -    58.245 (meters)      191.09  (feet) ADJUSTED
 HV1455  ______________________________________________________________________
 HV1455  GEOID HEIGHT    -        -32.245 (meters)                     GEOID18
 HV1455  LAPLACE CORR    -         -3.42  (seconds)                    DEFLEC18
 HV1455  DYNAMIC HEIGHT  -         58.214 (meters)      190.99  (feet) COMP
 HV1455  MODELED GRAVITY -    980,086.8   (mgal)                       NAVD 88
 HV1455
 HV1455  HORZ ORDER      -  SECOND
 HV1455  VERT ORDER      -  SECOND    CLASS 0
 HV1455
 HV1455.The horizontal coordinates were established by classical geodetic methods
 HV1455.and adjusted by the National Geodetic Survey in November 1994.
 HV1455
 HV1455.The orthometric height was determined by differential leveling and
 HV1455.adjusted by the NATIONAL GEODETIC SURVEY
 HV1455.in June 1991.
 HV1455
 HV1455.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1455.GEOID18 height accuracy estimate available here.
 HV1455
 HV1455.Click photographs - Photos may exist for this station.
 HV1455
 HV1455.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1455
 HV1455.The dynamic height is computed by dividing the NAVD 88
 HV1455.geopotential number by the normal gravity value computed on the
 HV1455.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1455.degrees latitude (g = 980.6199 gals.).
 HV1455
 HV1455.The modeled gravity was interpolated from observed gravity values.
 HV1455
 HV1455. The following values were computed from the NAD 83(1993) position.
 HV1455
 HV1455;                    North         East     Units Scale Factor Converg.
 HV1455;SPC MD       -   131,000.319   401,701.922   MT  0.99994998   +0 00 44.3
 HV1455;SPC MD       -   429,790.21  1,317,917.06   sFT  0.99994998   +0 00 44.3
 HV1455;SPC VA N     - 2,132,086.712 3,631,909.569   MT  0.99995637   +0 56 54.3
 HV1455;SPC VA N     - 6,995,021.15 11,915,689.98   sFT  0.99995637   +0 56 54.3
 HV1455;UTM  18      - 4,301,639.891   328,137.615   MT  0.99996372   -1 14 33.0
 HV1455
 HV1455!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1455!SPC MD       -   0.99999592  x   0.99994998  =   0.99994590
 HV1455!SPC VA N     -   0.99999592  x   0.99995637  =   0.99995229
 HV1455!UTM  18      -   0.99999592  x   0.99996372  =   0.99995964
 HV1455
 HV1455:                Primary Azimuth Mark                     Grid Az
 HV1455:SPC MD       -  S E 165 A 1960                           250 27 52.0
 HV1455:SPC VA N     -  S E 165 A 1960                           249 31 42.0
 HV1455:UTM  18      -  S E 165 A 1960                           251 43 09.3
 HV1455
 HV1455_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2813701639(NAD 83)
 HV1455
 HV1455|---------------------------------------------------------------------|
 HV1455| PID    Reference Object                     Distance      Geod. Az  |
 HV1455|                                                           dddmmss.s |
 HV1455| HV7548 S E 160 D 1960                      187.016 METERS 05506     |
 HV1455| HV7562 S E 165 A 1960                      APPROX. 0.7 KM 2502836.3 |
 HV1455| CX3706 SE 165 AZ MK                                       2514719.2 |
 HV1455|---------------------------------------------------------------------|
 HV1455
 HV1455                          SUPERSEDED SURVEY CONTROL
 HV1455
 HV1455  NAD 83(1991)-  38 50 48.49249(N)    076 58 49.42113(W) AD(       ) 2
 HV1455  NAD 83(1986)-  38 50 48.49200(N)    076 58 49.43248(W) AD(       ) 2
 HV1455  NAD 27      -  38 50 48.09040(N)    076 58 50.52710(W) AD(       ) 2
 HV1455  NGVD 29              58.49   (m)          191.9    (f) LEVELING    3  
 HV1455  NGVD 29 (11/26/84)   58.487  (m)          191.89   (f) ADJUSTED    2 0
 HV1455
 HV1455.Superseded values are not recommended for survey control.
 HV1455
 HV1455.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1455.See file dsdata.pdf to determine how the superseded data were derived.
 HV1455
 HV1455_MARKER: DD = SURVEY DISK
 HV1455_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV1455_STAMPING: USCGS NO SE 165
 HV1455_MARK LOGO: DCDHT
 HV1455_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1455+STABILITY: SURFACE MOTION
 HV1455
 HV1455  HISTORY     - Date     Condition        Report By
 HV1455  HISTORY     - 1960     MONUMENTED       DCDHT
 HV1455  HISTORY     - 1960     GOOD             MADHOP
 HV1455  HISTORY     - 1971     GOOD             NGS
 HV1455
 HV1455                          STATION DESCRIPTION
 HV1455
 HV1455'DESCRIBED BY DC DEPARTMENT OF HIGHWAYS AND TRAFFIC 1960 (CJM)
 HV1455'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV1455'DEPARTMENT OF HIGHWAYS AND TRAFFIC - CGS NO SE 165 SET IN TOP OF 12 IN
 HV1455'CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID
 HV1455'LABELED SURVEY.
 HV1455'
 HV1455'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA DEPARTMENT
 HV1455'OF HIGHWAYS AND TRAFFIC - CGS NO SE 165-AZ. SET IN TOP OF 12 IN
 HV1455'CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER WITH LID
 HV1455'LABELED SURVEY.  NO GEOGRAPHIC POSITION.
 HV1455
 HV1455                          STATION RECOVERY (1960)
 HV1455
 HV1455'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV1455'AT WASHINGTON DC.
 HV1455'LOCATED AT INTERSECTION OF STANTON RD S.E. AND ALABAMA AVE.  IN
 HV1455'SOUTHWEST CORNER OF INTERSECTION.  32.41 FT SOUTHWEST OF CROSS
 HV1455'ON RIM OF MANHOLE, AND 33.17 FT SOUTHWEST OF CROSS ON RIM OF
 HV1455'MANHOLE NEAR CENTER OF INTERSECTION, AND 36.80 FT SOUTH OF CROSS
 HV1455'ON RIM OF MANHOLE ON ALABAMA AVE.  A STANDARD BRASS DISC SET IN
 HV1455'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV1455'COVER WITH LID LABELED SURVEY.
 HV1455
 HV1455                          STATION RECOVERY (1971)
 HV1455
 HV1455'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1455'STATION RECOVERED IN GOOD CONDITION.  THE CROSSES CUT ON MANHOLE RIMS
 HV1455'HAVE BEEN WORN OFF BY TRAFFIC.
 HV1455'
 HV1455'SE 165 AZ. STATION AZIMUTH MARK RECOVERED AS DESCRIBED ON DESCRIPTION
 HV1455'CARD AND SKETCH.
 HV1455'
 HV1455'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7557 ***********************************************************************
 HV7557  DESIGNATION -  SE 167
 HV7557  PID         -  HV7557
 HV7557  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7557  COUNTRY     -  US
 HV7557  USGS QUAD   -  ANACOSTIA (2016)
 HV7557
 HV7557                         *CURRENT SURVEY CONTROL
 HV7557  ______________________________________________________________________
 HV7557* NAD 83(1993) POSITION- 38 49 55.25780(N) 076 59 14.44382(W)   ADJUSTED
 HV7557* NAVD 88 ORTHO HEIGHT -    57.09  (+/-2cm)      187.3   (feet) VERTCON3
 HV7557  ______________________________________________________________________
 HV7557  GEOID HEIGHT    -        -32.260 (meters)                     GEOID18
 HV7557  LAPLACE CORR    -         -3.20  (seconds)                    DEFLEC18
 HV7557  HORZ ORDER      -  SECOND
 HV7557  VERT ORDER      -  THIRD ? (See Below)
 HV7557
 HV7557.The horizontal coordinates were established by classical geodetic methods
 HV7557.and adjusted by the National Geodetic Survey in November 1994.
 HV7557
 HV7557.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV7557.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV7557
 HV7557.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7557.GEOID18 height accuracy estimate available here.
 HV7557
 HV7557.The vertical order pertains to the NGVD 29 superseded value.
 HV7557
 HV7557.Click photographs - Photos may exist for this station.
 HV7557
 HV7557.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7557
 HV7557. The following values were computed from the NAD 83(1993) position.
 HV7557
 HV7557;                    North         East     Units Scale Factor Converg.
 HV7557;SPC MD       -   129,358.659   401,098.746   MT  0.99995014   +0 00 28.6
 HV7557;SPC MD       -   424,404.20  1,315,938.14   sFT  0.99995014   +0 00 28.6
 HV7557;SPC VA N     - 2,130,435.406 3,631,333.291   MT  0.99995537   +0 56 38.7
 HV7557;SPC VA N     - 6,989,603.49 11,913,799.31   sFT  0.99995537   +0 56 38.7
 HV7557;UTM  18      - 4,300,011.806   327,498.629   MT  0.99996643   -1 14 47.2
 HV7557
 HV7557!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7557!SPC MD       -   0.99999610  x   0.99995014  =   0.99994624
 HV7557!SPC VA N     -   0.99999610  x   0.99995537  =   0.99995147
 HV7557!UTM  18      -   0.99999610  x   0.99996643  =   0.99996253
 HV7557
 HV7557:                Primary Azimuth Mark                     Grid Az
 HV7557:SPC MD       -  SE 167 AZ MK                             312 45 37.1
 HV7557:SPC VA N     -  SE 167 AZ MK                             311 49 27.0
 HV7557:UTM  18      -  SE 167 AZ MK                             314 00 52.9
 HV7557
 HV7557_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2749800011(NAD 83)
 HV7557
 HV7557|---------------------------------------------------------------------|
 HV7557| PID    Reference Object                     Distance      Geod. Az  |
 HV7557|                                                           dddmmss.s |
 HV7557| CX3707 SE 167 AZ MK                                       3124605.7 |
 HV7557| HV7559 S E 164 D 1960                      265.059 METERS 31252     |
 HV7557|---------------------------------------------------------------------|
 HV7557
 HV7557                          SUPERSEDED SURVEY CONTROL
 HV7557
 HV7557  NAD 83(1991)-  38 49 55.25620(N)    076 59 14.44473(W) AD(       ) 2
 HV7557  NAD 83(1986)-  38 49 55.25481(N)    076 59 14.45585(W) AD(       ) 2
 HV7557  NAD 27      -  38 49 54.85220(N)    076 59 15.54940(W) AD(       ) 2
 HV7557  NGVD 29              57.34   (m)          188.1    (f) LEVELING    3  
 HV7557
 HV7557.Superseded values are not recommended for survey control.
 HV7557
 HV7557.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7557.See file dsdata.pdf to determine how the superseded data were derived.
 HV7557
 HV7557_MARKER: DS = TRIANGULATION STATION DISK
 HV7557_SETTING: 0 = UNSPECIFIED SETTING
 HV7557
 HV7557  HISTORY     - Date     Condition        Report By
 HV7557  HISTORY     - 1960     MONUMENTED       MADHOP
 HV7557  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV7557
 HV7557                          STATION DESCRIPTION
 HV7557
 HV7557'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7557'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV7557'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO SE 167 SET IN
 HV7557'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV7557'COVER WITH LID LABELED SURVEY.
 HV7557'
 HV7557'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV7557'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO SE 176-AZ. SET
 HV7557'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD
 HV7557'MANHOLE COVER WITH LID LABELED SURVEY.
 HV7557'
 HV7557'NO GEOGRAPHIC POSITION.
 HV7557
 HV7557                          STATION RECOVERY (1971)
 HV7557
 HV7557'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7557'STATION WAS NOT RECOVERED, AREA IS COVERED WITH NEW CONCRETE AND
 HV7557'BRICK SIDEWALK AT STATION LOCATION.  THE MANHOLES REFERRED TO WERE
 HV7557'ALL RECOVERED BUT THE CHISELED CROSSES MARKING THE REFERENCE
 HV7557'POINTS HAVE ALL BEEN WORN OFF BY TRAFFIC.
 HV7557'
 HV7557'SE 167 AZ.  THIS MARK WAS RECOVERED AS DESCRIBED AND REFERENCE
 HV7557'POINTS REMAIN THE SAME.
 HV7557'
 HV7557'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV7557'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1451 ***********************************************************************
 HV1451  DESIGNATION -  SE 167 2
 HV1451  PID         -  HV1451
 HV1451  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1451  COUNTRY     -  US
 HV1451  USGS QUAD   -  ANACOSTIA (2016)
 HV1451
 HV1451                         *CURRENT SURVEY CONTROL
 HV1451  ______________________________________________________________________
 HV1451* NAD 83(1993) POSITION- 38 49 55.37922(N) 076 59 15.20786(W)   NO CHECK
 HV1451* NAVD 88 ORTHO HEIGHT -    57.15  (meters)      187.5   (feet) RESET
 HV1451  ______________________________________________________________________
 HV1451  GEOID HEIGHT    -        -32.259 (meters)                     GEOID18
 HV1451  LAPLACE CORR    -         -3.20  (seconds)                    DEFLEC18
 HV1451  HORZ ORDER      -  THIRD
 HV1451  VERT ORDER      -  THIRD
 HV1451
 HV1451.The horizontal coordinates were established by classical geodetic methods
 HV1451.and adjusted by the National Geodetic Survey in November 1994.
 HV1451
 HV1451.No horizontal observational check was made to the station.
 HV1451
 HV1451.The orthometric height was computed from unverified reset data.
 HV1451
 HV1451.No vertical observational check was made to the station.
 HV1451
 HV1451.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1451.GEOID18 height accuracy estimate available here.
 HV1451
 HV1451.Click photographs - Photos may exist for this station.
 HV1451
 HV1451.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1451
 HV1451. The following values were computed from the NAD 83(1993) position.
 HV1451
 HV1451;                    North         East     Units Scale Factor Converg.
 HV1451;SPC MD       -   129,362.400   401,080.318   MT  0.99995014   +0 00 28.1
 HV1451;SPC MD       -   424,416.47  1,315,877.68   sFT  0.99995014   +0 00 28.1
 HV1451;SPC VA N     - 2,130,438.846 3,631,314.804   MT  0.99995538   +0 56 38.2
 HV1451;SPC VA N     - 6,989,614.78 11,913,738.65   sFT  0.99995538   +0 56 38.2
 HV1451;UTM  18      - 4,300,015.950   327,480.287   MT  0.99996651   -1 14 47.7
 HV1451
 HV1451!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1451!SPC MD       -   0.99999609  x   0.99995014  =   0.99994623
 HV1451!SPC VA N     -   0.99999609  x   0.99995538  =   0.99995147
 HV1451!UTM  18      -   0.99999609  x   0.99996651  =   0.99996260
 HV1451
 HV1451_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2748000015(NAD 83)
 HV1451
 HV1451                          SUPERSEDED SURVEY CONTROL
 HV1451
 HV1451  NAD 83(1991)-  38 49 55.37762(N)    076 59 15.20878(W) AD(       ) 3
 HV1451  NAD 83(1986)-  38 49 55.37624(N)    076 59 15.21992(W) AD(       ) 3
 HV1451  NAD 27      -  38 49 54.97360(N)    076 59 16.31343(W) AD(       ) 3
 HV1451  NGVD 29 (??/??/??)   57.39   (m)          188.3    (f) RESET       3  
 HV1451  NGVD 29              57.38   (m)          188.3    (f) LEVELING    3  
 HV1451
 HV1451.Superseded values are not recommended for survey control.
 HV1451
 HV1451.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1451.See file dsdata.pdf to determine how the superseded data were derived.
 HV1451
 HV1451_MARKER: DE = TRAVERSE STATION DISK
 HV1451_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1451_SP_SET: SIDEWALK
 HV1451_STAMPING: DC DEPT H AND T SE 167 2 1967
 HV1451_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1451
 HV1451  HISTORY     - Date     Condition        Report By
 HV1451  HISTORY     - 1967     MONUMENTED       CGS
 HV1451  HISTORY     - 1967     GOOD             CGS
 HV1451  HISTORY     - 1971     GOOD             NGS
 HV1451
 HV1451                          STATION DESCRIPTION
 HV1451
 HV1451'DESCRIBED BY COAST AND GEODETIC SURVEY 1967 (KDB)
 HV1451'STATION IS A USC AND GS TRAVERSE DISK STAMPED D.C.DEPT.H AND
 HV1451'T. S.E. 167 2 1967 CEMENTED IN A DRILL HOLE IN THE SIDEWALK, IN
 HV1451'THE NORTHWEST ANGLE OF THE INTERSECTION OF WHEELER ROAD AND
 HV1451'SOUTHERN AVE.  IT IS 17.8 FEET WEST OF A HIGHLINE POLE WITH
 HV1451'STREET SIGNS ATTACHED, 12 FEET SOUTH OF THE SOUTHEAST CORNER OF
 HV1451'APARTMENT BUILDING 954 AND 6 INCHES SOUTH OF THE NORTH EDGE
 HV1451'OF THE SIDEWALK.  DUE TO CONSTRUCTION IN THE AREA THE AZIMUTH
 HV1451'MARK COULD NOT BE INTERSECTED.
 HV1451
 HV1451                          STATION RECOVERY (1967)
 HV1451
 HV1451'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1967
 HV1451'AT WASHINGTON DC.
 HV1451'LOCATED IN THE NORTHWEST ANGLE OF THE INTERSECTION OF WHEELER
 HV1451'ROAD AND SOUTHERN AVENUE, 17.8 FEET WEST OF A HIGHLINE POLE WITH
 HV1451'STREET SIGNS ATTACHED, 12 FEET SOUTH OF THE SOUTHEAST CORNER OF
 HV1451'APARTMENT BUILDING 954 SOUTHERN AVENUE AND 6 INCHES SOUTH OF
 HV1451'THE NORTH EDGE OF THE SIDEWALK AND SET IN THE SIDE WALK.
 HV1451
 HV1451                          STATION RECOVERY (1971)
 HV1451
 HV1451'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV1451'STATION IS A COAST AND GEODETIC SURVEY STATION TRIANGULATION DISK,
 HV1451'STAMPED D.C. DEPT. H. AND T. SE 167 2 1967, IT IS CEMENTED IN
 HV1451'A DRILL HOLE IN A CONCRETE SIDEWALK AND FLUSH WITH SURFACE OF
 HV1451'WALK.  IT IS LOCATED AS SHOWN ON SKETCH.
 HV1451'
 HV1451'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV1451'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2195 ***********************************************************************
 HV2195  DESIGNATION -  SE 168
 HV2195  PID         -  HV2195
 HV2195  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2195  COUNTRY     -  US
 HV2195  USGS QUAD   -  ALEXANDRIA (2019)
 HV2195
 HV2195                         *CURRENT SURVEY CONTROL
 HV2195  ______________________________________________________________________
 HV2195* NAD 83(1993) POSITION- 38 49 16.19009(N) 077 00 04.88799(W)   ADJUSTED
 HV2195* NAVD 88 ORTHO HEIGHT -    11.830 (meters)       38.81  (feet) ADJUSTED
 HV2195  ______________________________________________________________________
 HV2195  GEOID HEIGHT    -        -32.258 (meters)                     GEOID18
 HV2195  LAPLACE CORR    -         -3.08  (seconds)                    DEFLEC18
 HV2195  DYNAMIC HEIGHT  -         11.824 (meters)       38.79  (feet) COMP
 HV2195  MODELED GRAVITY -    980,086.4   (mgal)                       NAVD 88
 HV2195
 HV2195  HORZ ORDER      -  SECOND
 HV2195  VERT ORDER      -  SECOND    CLASS 0
 HV2195
 HV2195.The horizontal coordinates were established by classical geodetic methods
 HV2195.and adjusted by the National Geodetic Survey in November 1994.
 HV2195
 HV2195.The orthometric height was determined by differential leveling and
 HV2195.adjusted by the NATIONAL GEODETIC SURVEY
 HV2195.in June 1991.
 HV2195
 HV2195.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2195.GEOID18 height accuracy estimate available here.
 HV2195
 HV2195.Click photographs - Photos may exist for this station.
 HV2195
 HV2195.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2195
 HV2195.The dynamic height is computed by dividing the NAVD 88
 HV2195.geopotential number by the normal gravity value computed on the
 HV2195.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2195.degrees latitude (g = 980.6199 gals.).
 HV2195
 HV2195.The modeled gravity was interpolated from observed gravity values.
 HV2195
 HV2195. The following values were computed from the NAD 83(1993) position.
 HV2195
 HV2195;                    North         East     Units Scale Factor Converg.
 HV2195;SPC MD       -   128,153.924   399,882.091   MT  0.99995030   -0 00 03.1
 HV2195;SPC MD       -   420,451.67  1,311,946.49   sFT  0.99995030   -0 00 03.1
 HV2195;SPC VA N     - 2,129,210.948 3,630,136.476   MT  0.99995468   +0 56 07.2
 HV2195;SPC VA N     - 6,985,586.25 11,909,872.76   sFT  0.99995468   +0 56 07.2
 HV2195;UTM  18      - 4,298,833.968   326,255.872   MT  0.99997173   -1 15 17.8
 HV2195
 HV2195!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2195!SPC MD       -   1.00000321  x   0.99995030  =   0.99995350
 HV2195!SPC VA N     -   1.00000321  x   0.99995468  =   0.99995789
 HV2195!UTM  18      -   1.00000321  x   0.99997173  =   0.99997494
 HV2195
 HV2195:                Primary Azimuth Mark                     Grid Az
 HV2195:SPC MD       -  S E 167 B 1960                           044 30 51.6
 HV2195:SPC VA N     -  S E 167 B 1960                           043 34 41.3
 HV2195:UTM  18      -  S E 167 B 1960                           045 46 06.3
 HV2195
 HV2195_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2625598833(NAD 83)
 HV2195
 HV2195|---------------------------------------------------------------------|
 HV2195| PID    Reference Object                     Distance      Geod. Az  |
 HV2195|                                                           dddmmss.s |
 HV2195| DE5017 SE 168 AZ MK                                       0441801.5 |
 HV2195| HV7570 S E 167 B 1960                      APPROX. 0.9 KM 0443048.5 |
 HV2195| HV4723 S E 168 A                           214.481 METERS 14441     |
 HV2195|---------------------------------------------------------------------|
 HV2195
 HV2195                          SUPERSEDED SURVEY CONTROL
 HV2195
 HV2195  NAD 83(1991)-  38 49 16.18845(N)    077 00 04.88897(W) AD(       ) 2
 HV2195  NAD 83(1986)-  38 49 16.18718(N)    077 00 04.90025(W) AD(       ) 2
 HV2195  NAD 27      -  38 49 15.78610(N)    077 00 05.98880(W) AD(       ) 2
 HV2195  NGVD 29              12.08   (m)           39.6    (f) LEVELING    3  
 HV2195  NGVD 29 (11/26/84)   12.076  (m)           39.62   (f) ADJUSTED    2 0
 HV2195
 HV2195.Superseded values are not recommended for survey control.
 HV2195
 HV2195.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2195.See file dsdata.pdf to determine how the superseded data were derived.
 HV2195
 HV2195_MARKER: DD = SURVEY DISK
 HV2195_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2195_SP_SET: MONUMENT
 HV2195_STAMPING: USCGS NO SE 168
 HV2195_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2195
 HV2195  HISTORY     - Date     Condition        Report By
 HV2195  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2195  HISTORY     - 1960     GOOD             MADHOP
 HV2195  HISTORY     - 1971     GOOD             NGS
 HV2195
 HV2195                          STATION DESCRIPTION
 HV2195
 HV2195'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2195'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2195'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO S E 168 SET
 HV2195'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2195'COVER WITH LID LABELED SURVEY.
 HV2195'
 HV2195'AZ MK IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2195'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS SE 168-AZ SET
 HV2195'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2195'COVER WITH LID LABELED SURVEY.
 HV2195'
 HV2195'NO GEOGRAPHIC POSITION
 HV2195
 HV2195                          STATION RECOVERY (1960)
 HV2195
 HV2195'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2195'IN WASHINGTON DC.
 HV2195'LOCATED AT INTERSECTION OF SOUTH CAPITOL ST. AND SOUTHERN AVE.
 HV2195'SE.  IN SOUTHEAST CORNER OF INTERSECTION BETWEEN SOUTHERN AVE
 HV2195'AND BRIDGE.  46.91 FT SOUTHEAST OF CROSS CUT IN RIM OF MANHOLE
 HV2195'IN INTERSECTION, AND 36.72 FT SOUTHEAST OF CROSS CUT IN RIM OF
 HV2195'MANHOLE IN ROADWAY OF SOUTHERN AVE., AND 8.03 FT SOUTHWEST OF
 HV2195'CROSS CUT IN WSSC BM RIM.  A STANDARD BRASS DISC SET IN TOP OF
 HV2195'12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE COVER
 HV2195'WITH LID LABELED SURVEY.
 HV2195
 HV2195                          STATION RECOVERY (1971)
 HV2195
 HV2195'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2195'STATION WAS RECOVERED AS DESCRIBED AND FOUND TO BE IN GOOD
 HV2195'CONDITION.
 HV2195'
 HV2195'S E 168 AZ.  THIS MARK COULD NOT BE RECOVERED, IF IT IS STILL AT
 HV2195'LOCATION IT WOULD BE UNDER A NEW CONCRETE AND BRICK PAVEMENT
 HV2195'BETWEEN CURB AND SIDEWALK.  ALL REFERENCE POINTS WERE RECOVERED
 HV2195'IN GOOD CONDITION.
 HV2195'
 HV2195'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2195'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2185 ***********************************************************************
 HV2185  DESIGNATION -  SE 168 DCDHT RESET
 HV2185  PID         -  HV2185
 HV2185  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2185  COUNTRY     -  US
 HV2185  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2185
 HV2185                         *CURRENT SURVEY CONTROL
 HV2185  ______________________________________________________________________
 HV2185* NAD 83(1986) POSITION- 38 54 46.     (N) 077 01 12.     (W)   SCALED
 HV2185* NAVD 88 ORTHO HEIGHT -    23.27  (+/-2cm)       76.3   (feet) VERTCON3
 HV2185  ______________________________________________________________________
 HV2185  GEOID HEIGHT    -        -32.062 (meters)                     GEOID18
 HV2185  VERT ORDER      -  THIRD (See Below)
 HV2185
 HV2185.The horizontal coordinates were scaled from a map and have
 HV2185.an estimated accuracy of +/- 6 seconds.
 HV2185
 HV2185.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV2185.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV2185
 HV2185.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2185.GEOID18 height accuracy estimate available here.
 HV2185
 HV2185.The vertical order pertains to the NGVD 29 superseded value.
 HV2185
 HV2185.Click photographs - Photos may exist for this station.
 HV2185
 HV2185
 HV2185_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ248090(NAD 83)
 HV2185
 HV2185                          SUPERSEDED SURVEY CONTROL
 HV2185
 HV2185  NGVD 29 (??/??/??)   23.50   (m)           77.1    (f) RESET       3  
 HV2185
 HV2185.Superseded values are not recommended for survey control.
 HV2185
 HV2185.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2185.See file dsdata.pdf to determine how the superseded data were derived.
 HV2185
 HV2185_MARKER: DD = SURVEY DISK
 HV2185_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2185_SP_SET: MONUMENT
 HV2185_STAMPING: USCGS NOSE 168 RESET
 HV2185_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2185
 HV2185  HISTORY     - Date     Condition        Report By
 HV2185  HISTORY     - UNK      MONUMENTED       MADHOP
 HV2185  HISTORY     - 1961     GOOD             MADHOP
 HV2185  HISTORY     - 1964     GOOD             CGS
 HV2185
 HV2185                          STATION DESCRIPTION
 HV2185
 HV2185'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1961
 HV2185'IN WASHINGTON DC.
 HV2185'LOCATED AT THE INTERSECTION OF RHODE ISLAND AVE. N.W. AND 6TH ST.
 HV2185'N.W. AT THE EAST END OF THE ISLAND IN CENTER OF RHODE ISLAND
 HV2185'AVE. AT INTERSECTION. 18.40 FT. NORTHWEST CROSS CUT IN MANHOLE
 HV2185'RIM, AND 20.12 FT. SOUTH OF CROSS CUT IN MANHOLE RIM.  A STANDARD
 HV2185'BRASS DISC SET IN TOP OF 12 IN. CONCRETE MONUMENT SURMOUNTED BY
 HV2185'A STANDARD MANHOLE COVER WITH LID LABELED SURVEY.
 HV2185
 HV2185                          STATION RECOVERY (1964)
 HV2185
 HV2185'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1964
 HV2185'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7698 ***********************************************************************
 HV7698  DESIGNATION -  SEATON ASTRONOMICAL STA 1850
 HV7698  PID         -  HV7698
 HV7698  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7698  COUNTRY     -  US
 HV7698  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7698
 HV7698                         *CURRENT SURVEY CONTROL
 HV7698  ______________________________________________________________________
 HV7698* NAD 83(1993) POSITION- 38 53 29.02855(N) 076 59 58.61990(W)   ADJUSTED
 HV7698* NAVD 88 ORTHO HEIGHT -    29.    (meters)       95.    (feet) SCALED
 HV7698  ______________________________________________________________________
 HV7698  GEOID HEIGHT    -        -32.141 (meters)                     GEOID18
 HV7698  LAPLACE CORR    -         -3.52  (seconds)                    DEFLEC18
 HV7698  HORZ ORDER      -  FIRST
 HV7698
 HV7698.The horizontal coordinates were established by classical geodetic methods
 HV7698.and adjusted by the National Geodetic Survey in November 1994.
 HV7698
 HV7698.The orthometric height was scaled from a topographic map.
 HV7698
 HV7698.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7698.GEOID18 height accuracy estimate available here.
 HV7698
 HV7698.Click photographs - Photos may exist for this station.
 HV7698
 HV7698.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7698
 HV7698. The following values were computed from the NAD 83(1993) position.
 HV7698
 HV7698;                    North         East     Units Scale Factor Converg.
 HV7698;SPC MD       -   135,950.280   400,033.258   MT  0.99994988   +0 00 00.9
 HV7698;SPC MD       -   446,030.21  1,312,442.45   sFT  0.99994988   +0 00 00.9
 HV7698;SPC VA N     - 2,137,008.789 3,630,160.241   MT  0.99995978   +0 56 11.1
 HV7698;SPC VA N     - 7,011,169.67 11,909,950.72   sFT  0.99995978   +0 56 11.1
 HV7698;UTM  18      - 4,306,625.307   326,577.773   MT  0.99997035   -1 15 20.8
 HV7698
 HV7698!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7698!SPC MD       -   1.00000053  x   0.99994988  =   0.99995041
 HV7698!SPC VA N     -   1.00000053  x   0.99995978  =   0.99996031
 HV7698!UTM  18      -   1.00000053  x   0.99997035  =   0.99997088
 HV7698
 HV7698:                Primary Azimuth Mark                     Grid Az
 HV7698:SPC MD       -  SOLDIERS HOME 1880                       349 58 36.6
 HV7698:SPC VA N     -  SOLDIERS HOME 1880                       349 02 26.4
 HV7698:UTM  18      -  SOLDIERS HOME 1880                       351 13 58.3
 HV7698
 HV7698_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2657706625(NAD 83)
 HV7698
 HV7698|---------------------------------------------------------------------|
 HV7698| PID    Reference Object                     Distance      Geod. Az  |
 HV7698|                                                           dddmmss.s |
 HV7698| HV4526 SOLDIERS HOME 1880                  APPROX. 5.7 KM 3495837.5 |
 HV7698|---------------------------------------------------------------------|
 HV7698
 HV7698                          SUPERSEDED SURVEY CONTROL
 HV7698
 HV7698  NAD 83(1991)-  38 53 29.02790(N)    076 59 58.62066(W) AD(       ) 1
 HV7698  NAD 83(1986)-  38 53 29.02710(N)    076 59 58.63166(W) AD(       ) 1
 HV7698  NAD 27      -  38 53 28.63000(N)    076 59 59.70000(W) AD(       ) 1
 HV7698  USBS        -  38 53 25.60000(N)    076 59 40.98000(W) AD(       ) 3
 HV7698  USSD        -  38 53 28.96100(N)    076 59 59.54300(W) AD(       ) 3
 HV7698
 HV7698.Superseded values are not recommended for survey control.
 HV7698
 HV7698.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7698.See file dsdata.pdf to determine how the superseded data were derived.
 HV7698
 HV7698
 HV7698  HISTORY     - Date     Condition        Report By
 HV7698  HISTORY     - 1850     MONUMENTED       COASUR
 HV7698  HISTORY     - 1869     SEE DESCRIPTION  COASUR
 HV7698
 HV7698                          STATION DESCRIPTION
 HV7698
 HV7698'DESCRIBED BY COAST SURVEY (CGS) 1869
 HV7698'THIS STATION IS IDENTICAL WITH THE TRIANGULATION STATION OF
 HV7698'THE SAME NAME, 6.43 METERS (21.1 FEET), E OF THE W SIDE OF FIFTH
 HV7698'STREET, NE, 37.49 METERS (123.0 FEET) N OF THE N SIDE OF A
 HV7698'STREET, AND 54.74 METERS (179.6 FEET), S OF THE S SIDE OF
 HV7698'B STREET.  THE STATION WAS MARKED BY A BRICK PIER ABOUT
 HV7698'6 BY 4 BY 2 FEET, WITH ITS TOP ABOUT 1-1/2 FEET BELOW THE
 HV7698'SURFACE OF THE GROUND.  IN 1869 STREET IMPROVEMENTS DESTROYED
 HV7698'THE STATION MARKS, BUT A PORTION OF THE BRICK FOUNDATION
 HV7698'WAS LEFT BENEATH THE SIDEWALK AND CURB.  THE CURB BEARS AN
 HV7698'E AND W CUT IN ITS UPPER SURFACE AT VERY NEARLY THE LOCATION
 HV7698'OF THE STATION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4399 ***********************************************************************
 HV4399  DESIGNATION -  SEDGWICK
 HV4399  PID         -  HV4399
 HV4399  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4399  COUNTRY     -  US
 HV4399  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4399
 HV4399                         *CURRENT SURVEY CONTROL
 HV4399  ______________________________________________________________________
 HV4399* NAD 83(1993) POSITION- 38 56 20.85335(N) 077 03 41.33303(W)   ADJUSTED
 HV4399  ______________________________________________________________________
 HV4399  GEOID HEIGHT    -        -31.974 (meters)                     GEOID18
 HV4399  LAPLACE CORR    -         -3.07  (seconds)                    DEFLEC18
 HV4399  HORZ ORDER      -  THIRD
 HV4399
 HV4399.The horizontal coordinates were established by classical geodetic methods
 HV4399.and adjusted by the National Geodetic Survey in November 1994.
 HV4399
 HV4399.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4399.GEOID18 height accuracy estimate available here.
 HV4399
 HV4399.Click photographs - Photos may exist for this station.
 HV4399
 HV4399.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4399
 HV4399. The following values were computed from the NAD 83(1993) position.
 HV4399
 HV4399;                    North         East     Units Scale Factor Converg.
 HV4399;SPC MD       -   141,250.404   394,669.792   MT  0.99995046   -0 02 18.9
 HV4399;SPC MD       -   463,419.03  1,294,845.81   sFT  0.99995046   -0 02 18.9
 HV4399;SPC VA N     - 2,142,220.624 3,624,710.820   MT  0.99996410   +0 53 52.1
 HV4399;SPC VA N     - 7,028,268.83 11,892,072.08   sFT  0.99996410   +0 53 52.1
 HV4399;UTM  18      - 4,312,041.956   321,331.671   MT  0.99999309   -1 17 45.5
 HV4399
 HV4399_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2133112041(NAD 83)
 HV4399
 HV4399                          SUPERSEDED SURVEY CONTROL
 HV4399
 HV4399  NAD 83(1991)-  38 56 20.85269(N)    077 03 41.33428(W) AD(       ) 3
 HV4399  NAD 83(1986)-  38 56 20.85224(N)    077 03 41.34443(W) AD(       ) 3
 HV4399  NAD 27      -  38 56 20.45300(N)    077 03 42.42100(W) AD(       ) 3
 HV4399
 HV4399.Superseded values are not recommended for survey control.
 HV4399
 HV4399.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4399.See file dsdata.pdf to determine how the superseded data were derived.
 HV4399
 HV4399_MARKER: Z = SEE DESCRIPTION
 HV4399_SETTING: 0 = UNSPECIFIED SETTING
 HV4399_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4399
 HV4399  HISTORY     - Date     Condition        Report By
 HV4399  HISTORY     - 1943     MONUMENTED       CGS
 HV4399
 HV4399                          STATION DESCRIPTION
 HV4399
 HV4399'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4399'STATION IS CENTER OF VENT PIPE, EXTENDED WITH 6-FOOT SECTION OF
 HV4399'2-INCH GALVANIZED IRON PIPE PAINTED WHITE, ON ROOF OF SEDGWICK
 HV4399'GARDENS, APARTMENT HOUSE, 3725 CONNECTICUT AVE., N.W.
 HV4399'
 HV4399'STATION IS 2.54 METERS FROM PARAPET ON WESTERN SIDE OF BUILDING,
 HV4399'16.43 METERS FROM PARAPET ON NORTH (FACING SEDGWICK ST., 14.21
 HV4399'METERS FROM PARAPET AT BACK OF BUILDING, 9.11 METERS FROM PARAPET
 HV4399'LINE EXTENDED ON THE EAST SIDE OF THE WEST WING.
 HV4399'
 HV4399'MEASUREMENTS WERE TAKEN TO INNER FACE OF PARAPET.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4406 ***********************************************************************
 HV4406  DESIGNATION -  SEWER USE 1924
 HV4406  PID         -  HV4406
 HV4406  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4406  COUNTRY     -  US
 HV4406  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4406
 HV4406                         *CURRENT SURVEY CONTROL
 HV4406  ______________________________________________________________________
 HV4406* NAD 83(1993) POSITION- 38 53 25.42503(N) 077 03 15.63401(W)   ADJUSTED
 HV4406* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV4406  ______________________________________________________________________
 HV4406  GEOID HEIGHT    -        -32.062 (meters)                     GEOID18
 HV4406  LAPLACE CORR    -         -2.57  (seconds)                    DEFLEC18
 HV4406  HORZ ORDER      -  THIRD
 HV4406
 HV4406.The horizontal coordinates were established by classical geodetic methods
 HV4406.and adjusted by the National Geodetic Survey in November 1994.
 HV4406
 HV4406.The orthometric height was scaled from a topographic map.
 HV4406
 HV4406.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4406.GEOID18 height accuracy estimate available here.
 HV4406
 HV4406.Click photographs - Photos may exist for this station.
 HV4406
 HV4406.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4406
 HV4406. The following values were computed from the NAD 83(1993) position.
 HV4406
 HV4406;                    North         East     Units Scale Factor Converg.
 HV4406;SPC MD       -   135,840.567   395,285.463   MT  0.99994988   -0 02 02.8
 HV4406;SPC MD       -   445,670.26  1,296,865.72   sFT  0.99994988   -0 02 02.8
 HV4406;SPC VA N     - 2,136,821.508 3,625,414.826   MT  0.99995970   +0 54 08.1
 HV4406;SPC VA N     - 7,010,555.23 11,894,381.81   sFT  0.99995970   +0 54 08.1
 HV4406;UTM  18      - 4,306,619.691   321,828.568   MT  0.99999091   -1 17 24.4
 HV4406
 HV4406!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4406!SPC MD       -   1.00000491  x   0.99994988  =   0.99995479
 HV4406!SPC VA N     -   1.00000491  x   0.99995970  =   0.99996461
 HV4406!UTM  18      -   1.00000491  x   0.99999091  =   0.99999582
 HV4406
 HV4406_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2182806619(NAD 83)
 HV4406
 HV4406                          SUPERSEDED SURVEY CONTROL
 HV4406
 HV4406  NAD 83(1991)-  38 53 25.42377(N)    077 03 15.63554(W) AD(       ) 3
 HV4406  NAD 83(1986)-  38 53 25.42350(N)    077 03 15.64600(W) AD(       ) 3
 HV4406  NAD 27      -  38 53 25.02200(N)    077 03 16.72300(W) AD(       ) 3
 HV4406
 HV4406.Superseded values are not recommended for survey control.
 HV4406
 HV4406.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4406.See file dsdata.pdf to determine how the superseded data were derived.
 HV4406
 HV4406_MARKER: DD = SURVEY DISK
 HV4406_SETTING: 0 = UNSPECIFIED SETTING
 HV4406_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4406
 HV4406  HISTORY     - Date     Condition        Report By
 HV4406  HISTORY     - 1924     MONUMENTED       USACE
 HV4406  HISTORY     - 1939     MARK NOT FOUND   CGS
 HV4406
 HV4406                          STATION DESCRIPTION
 HV4406
 HV4406'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1924 (EWE)
 HV4406'STATION IS ON THE EASTERN SHORE OF THE POTOMAC RIVER, ON THE
 HV4406'OUTFALL SEWER 140 METERS N OF THE LINCOLN MEMORIAL.  THE SEWER
 HV4406'ENDS IN A RECTANGULAR CONCRETE STRUCTURE, AND THE STANDARD U.S.E.
 HV4406'DISK WAS CEMENTED INTO A DRILL HOLE IN THIS STRUCTURE.
 HV4406
 HV4406                          STATION RECOVERY (1939)
 HV4406
 HV4406'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4406'STATION IS DESTROYED BY NEW CONSTRUCTION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DR4186 ***********************************************************************
 DR4186  DESIGNATION -  SHA 705
 DR4186  PID         -  DR4186
 DR4186  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DR4186  COUNTRY     -  US
 DR4186  USGS QUAD   -  WASHINGTON EAST (2016)
 DR4186
 DR4186                         *CURRENT SURVEY CONTROL
 DR4186  ______________________________________________________________________
 DR4186* NAD 83(1986) POSITION- 38 52 33.6    (N) 076 58 33.5    (W)   HD_HELD2
 DR4186* NAVD 88 ORTHO HEIGHT -    10.840 (meters)       35.56  (feet) ADJUSTED
 DR4186  ______________________________________________________________________
 DR4186  GEOID HEIGHT    -        -32.211 (meters)                     GEOID18
 DR4186  DYNAMIC HEIGHT  -         10.835 (meters)       35.55  (feet) COMP
 DR4186  MODELED GRAVITY -    980,093.1   (mgal)                       NAVD 88
 DR4186
 DR4186  VERT ORDER      -  FIRST     CLASS II
 DR4186
 DR4186.The horizontal coordinates were established by autonomous hand held GPS
 DR4186.observations and have an estimated accuracy of +/- 10 meters.
 DR4186
 DR4186.The orthometric height was determined by differential leveling and
 DR4186.adjusted by the NATIONAL GEODETIC SURVEY
 DR4186.in August 2020.
 DR4186
 DR4186.Significant digits in the geoid height do not necessarily reflect accuracy.
 DR4186.GEOID18 height accuracy estimate available here.
 DR4186
 DR4186.Click photographs - Photos may exist for this station.
 DR4186
 DR4186.The dynamic height is computed by dividing the NAVD 88
 DR4186.geopotential number by the normal gravity value computed on the
 DR4186.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DR4186.degrees latitude (g = 980.6199 gals.).
 DR4186
 DR4186.The modeled gravity was interpolated from observed gravity values.
 DR4186
 DR4186
 DR4186_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2859104871(NAD 83)
 DR4186
 DR4186                          SUPERSEDED SURVEY CONTROL
 DR4186
 DR4186.No superseded survey control is available for this station.
 DR4186
 DR4186_MARKER: DD = SURVEY DISK
 DR4186_SETTING: 38 = SET IN THE ABUTMENT OR PIER OF A LARGE BRIDGE
 DR4186_SP_SET: ABUTMENT BACK WALL
 DR4186_STAMPING: SHA 705 2020
 DR4186_MARK LOGO: MDSHA
 DR4186_MAGNETIC: N = NO MAGNETIC MATERIAL
 DR4186_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 DR4186_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 DR4186+SATELLITE: SATELLITE OBSERVATIONS - March 15, 2020
 DR4186
 DR4186  HISTORY     - Date     Condition        Report By
 DR4186  HISTORY     - 20200315 MONUMENTED       MDSHA
 DR4186
 DR4186                          STATION DESCRIPTION
 DR4186
 DR4186'DESCRIBED BY MARYLAND DOT HIGHWAY ADMINISTRATION 2020 (JML)
 DR4186'THE MARK IS LOCATED ABOUT 8.8 MI (14.1 KM) SOUTHWEST OF LANHAM, 4.8 MI
 DR4186'(7.8 KM) WEST-NORTHWEST OF DISTRICT HEIGHTS AND 3.0 MI (4.8 KM) WEST
 DR4186'OF CORAL HILLS.
 DR4186'
 DR4186'TO REACH FROM THE I-495 MD 4 INTERCHANGE, GO NORTHWEST ON MD
 DR4186'4/PENNSYLVANIA AVENUE FOR 6.7 MI (10.8 KM) TO THE JOHN PHILLIP SOUSA
 DR4186'BRIDGE AND THE MARK ON THE RIGHT IN THE BRIDGE WALKWAY.
 DR4186'
 DR4186'IT IS 10.2 FT (3.1 M) NORTHWEST OF AN ELECTRICAL HAND BOX, 8.8 FT (2.7
 DR4186'M) WEST OF A LIGHT POLE, 6.1 FT (1.9 M) NORTHEAST OF A GUARDRAIL, 3.0
 DR4186'FT (0.9 M) SOUTHWEST OF A RAILING, 2.8 FT (0.9 M) SOUTH OF A BRIDGE
 DR4186'EXPANSION JOINT AND ABOUT LEVEL WITH THE ROAD.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DR4187 ***********************************************************************
 DR4187  DESIGNATION -  SHA 706
 DR4187  PID         -  DR4187
 DR4187  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DR4187  COUNTRY     -  US
 DR4187  USGS QUAD   -  WASHINGTON EAST (2016)
 DR4187
 DR4187                         *CURRENT SURVEY CONTROL
 DR4187  ______________________________________________________________________
 DR4187* NAD 83(1986) POSITION- 38 52 40.8    (N) 076 58 47.0    (W)   HD_HELD2
 DR4187* NAVD 88 ORTHO HEIGHT -    13.920 (meters)       45.67  (feet) ADJUSTED
 DR4187  ______________________________________________________________________
 DR4187  GEOID HEIGHT    -        -32.202 (meters)                     GEOID18
 DR4187  DYNAMIC HEIGHT  -         13.912 (meters)       45.64  (feet) COMP
 DR4187  MODELED GRAVITY -    980,094.5   (mgal)                       NAVD 88
 DR4187
 DR4187  VERT ORDER      -  FIRST     CLASS II
 DR4187
 DR4187.The horizontal coordinates were established by autonomous hand held GPS
 DR4187.observations and have an estimated accuracy of +/- 10 meters.
 DR4187
 DR4187.The orthometric height was determined by differential leveling and
 DR4187.adjusted by the NATIONAL GEODETIC SURVEY
 DR4187.in August 2020.
 DR4187
 DR4187.Significant digits in the geoid height do not necessarily reflect accuracy.
 DR4187.GEOID18 height accuracy estimate available here.
 DR4187
 DR4187.Click photographs - Photos may exist for this station.
 DR4187
 DR4187.The dynamic height is computed by dividing the NAVD 88
 DR4187.geopotential number by the normal gravity value computed on the
 DR4187.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DR4187.degrees latitude (g = 980.6199 gals.).
 DR4187
 DR4187.The modeled gravity was interpolated from observed gravity values.
 DR4187
 DR4187
 DR4187_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2827105100(NAD 83)
 DR4187
 DR4187                          SUPERSEDED SURVEY CONTROL
 DR4187
 DR4187.No superseded survey control is available for this station.
 DR4187
 DR4187_MARKER: DV = VERTICAL CONTROL DISK
 DR4187_SETTING: 38 = SET IN THE ABUTMENT OR PIER OF A LARGE BRIDGE
 DR4187_SP_SET: BRIDGE ABUTMENT BACK WALL
 DR4187_STAMPING: SHA 706
 DR4187_MARK LOGO: MDSHA
 DR4187_MAGNETIC: N = NO MAGNETIC MATERIAL
 DR4187_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 DR4187
 DR4187  HISTORY     - Date     Condition        Report By
 DR4187  HISTORY     - 20200315 MONUMENTED       MDSHA
 DR4187
 DR4187                          STATION DESCRIPTION
 DR4187
 DR4187'DESCRIBED BY MARYLAND DOT HIGHWAY ADMINISTRATION 2020 (JML)
 DR4187'THE MARK IS LOCATED ABOUT 8.8 MI (14.2 KM) SOUTHWEST OF LANHAM, 5.1 MI
 DR4187'(8.2 KM) WEST-NORTHWEST OF DISTRICT HEIGHTS AND 3.2 MI (5.1 KM) WEST
 DR4187'OF CORAL HILLS.
 DR4187'
 DR4187'TO REACH FROM THE I-495 MD 4 INTERCHANGE, GO NORTHWEST ON MD
 DR4187'4/PENNSYLVANIA AVENUE FOR 6.9 MI (11.1 KM) TO THE MARK ON THE RIGHT ON
 DR4187'THE NORTHWEST ABUTMENT OF THE JOHN PHILLIP SOUSA BRIDGE.
 DR4187'
 DR4187'IT IS 65.4 FT (19.9 M) SOUTH OF AN ELECTRIC MANHOLE, 55.9 FT (17.0 M)
 DR4187'NORTHWEST OF LIGHT POLE NUMBER 66269, 10.8 FT (3.3 M) NORTHWEST OF AN
 DR4187'ELECTRICAL JUNCTION BOX, 5.3 FT (1.6 M) NORTH OF AN ELECTRICAL
 DR4187'JUNCTION BOX, 5.0 FT (1.5 M) NORTHEAST OF A HANDRAIL, 2.4 FT (0.7 M)
 DR4187'SOUTHWEST OF THE FACE OF A CURB, 1.2 FT (0.4 M) NORTH OF AN EXPANSION
 DR4187'JOINT AND ABOUT LEVEL WITH THE ROAD.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4380 ***********************************************************************
 HV4380  DESIGNATION -  SIS USE 1932
 HV4380  PID         -  HV4380
 HV4380  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4380  COUNTRY     -  US
 HV4380  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4380
 HV4380                         *CURRENT SURVEY CONTROL
 HV4380  ______________________________________________________________________
 HV4380* NAD 83(1993) POSITION- 38 54 14.55944(N) 077 04 53.51894(W)   ADJUSTED
 HV4380* NAVD 88 ORTHO HEIGHT -    -0.    (meters)       -0.    (feet) SCALED
 HV4380  ______________________________________________________________________
 HV4380  GEOID HEIGHT    -        -31.999 (meters)                     GEOID18
 HV4380  LAPLACE CORR    -         -2.83  (seconds)                    DEFLEC18
 HV4380  HORZ ORDER      -  THIRD
 HV4380
 HV4380.The horizontal coordinates were established by classical geodetic methods
 HV4380.and adjusted by the National Geodetic Survey in November 1994.
 HV4380
 HV4380.The orthometric height was scaled from a topographic map.
 HV4380
 HV4380.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4380.GEOID18 height accuracy estimate available here.
 HV4380
 HV4380.Click photographs - Photos may exist for this station.
 HV4380
 HV4380.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4380
 HV4380. The following values were computed from the NAD 83(1993) position.
 HV4380
 HV4380;                    North         East     Units Scale Factor Converg.
 HV4380;SPC MD       -   137,357.408   392,927.911   MT  0.99994997   -0 03 04.2
 HV4380;SPC MD       -   450,646.76  1,289,130.99   sFT  0.99994997   -0 03 04.2
 HV4380;SPC VA N     - 2,138,299.633 3,623,032.775   MT  0.99996086   +0 53 07.0
 HV4380;SPC VA N     - 7,015,404.71 11,886,566.70   sFT  0.99996086   +0 53 07.0
 HV4380;UTM  18      - 4,308,187.925   319,504.730   MT  1.00000118   -1 18 27.3
 HV4380
 HV4380!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4380!SPC MD       -   1.00000506  x   0.99994997  =   0.99995503
 HV4380!SPC VA N     -   1.00000506  x   0.99996086  =   0.99996592
 HV4380!UTM  18      -   1.00000506  x   1.00000118  =   1.00000624
 HV4380
 HV4380:                Primary Azimuth Mark                     Grid Az
 HV4380:SPC MD       -  CRAMPTON                                 078 12 22.6
 HV4380:SPC VA N     -  CRAMPTON                                 077 16 11.4
 HV4380:UTM  18      -  CRAMPTON                                 079 27 45.7
 HV4380
 HV4380_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1950408187(NAD 83)
 HV4380
 HV4380|---------------------------------------------------------------------|
 HV4380| PID    Reference Object                     Distance      Geod. Az  |
 HV4380|                                                           dddmmss.s |
 HV4380| HV4197 CRAMPTON                            435.061 METERS 0780918.4 |
 HV4380| HV3620 MAPLE POINT 147                     343.826 METERS 12331     |
 HV4380|---------------------------------------------------------------------|
 HV4380
 HV4380                          SUPERSEDED SURVEY CONTROL
 HV4380
 HV4380  NAD 83(1991)-  38 54 14.55820(N)    077 04 53.52051(W) AD(       ) 3
 HV4380  NAD 83(1986)-  38 54 14.55778(N)    077 04 53.52986(W) AD(       ) 3
 HV4380  NAD 27      -  38 54 14.15800(N)    077 04 54.60300(W) AD(       ) 3
 HV4380
 HV4380.Superseded values are not recommended for survey control.
 HV4380
 HV4380.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4380.See file dsdata.pdf to determine how the superseded data were derived.
 HV4380
 HV4380
 HV4380  HISTORY     - Date     Condition        Report By
 HV4380  HISTORY     - 1932     MONUMENTED       CGS
 HV4380  HISTORY     - 1946     GOOD             CGS
 HV4380
 HV4380                          STATION DESCRIPTION
 HV4380
 HV4380'DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4380'STATION SITE IS ON THE FARTHEST UPSTREAM GROUP OF ROCKS THAT
 HV4380'FORM WHAT IS CALLED THE THREE SISTER ISLANDS (ROCKS) THAT
 HV4380'LIE IN THE POTOMAC RIVER NEAR THE E SHORE ABOVE KEY BRIDGE
 HV4380'AT A POINT WHERE THE RIVER SWINGS FROM ITS SE COURSE BELOW
 HV4380'THE GEORGETOWN RESERVOIR.  THE STATION IS A STANDARD U.S.E.
 HV4380'1/4-INCH BRASS PIPE LEADED IN A 1-INCH DRILL HOLE IN A FLAT
 HV4380'TOP ROCK, ABOUT THE ONLY ROCK IN THE GROUP OF WHICH A TRANSIT
 HV4380'COULD BE SET UP, ELEVATION ABOUT 6 FEET ABOVE MEAN LOW WATER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7568 ***********************************************************************
 HV7568  DESIGNATION -  SLIP USE 1923
 HV7568  PID         -  HV7568
 HV7568  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7568  COUNTRY     -  US
 HV7568  USGS QUAD   -  ANACOSTIA (2016)
 HV7568
 HV7568                         *CURRENT SURVEY CONTROL
 HV7568  ______________________________________________________________________
 HV7568* NAD 83(1993) POSITION- 38 52 17.98524(N) 076 59 39.88353(W)   ADJUSTED
 HV7568* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV7568  ______________________________________________________________________
 HV7568  GEOID HEIGHT    -        -32.187 (meters)                     GEOID18
 HV7568  LAPLACE CORR    -         -3.12  (seconds)                    DEFLEC18
 HV7568  HORZ ORDER      -  THIRD
 HV7568
 HV7568.The horizontal coordinates were established by classical geodetic methods
 HV7568.and adjusted by the National Geodetic Survey in November 1994.
 HV7568
 HV7568.The orthometric height was scaled from a topographic map.
 HV7568
 HV7568.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7568.GEOID18 height accuracy estimate available here.
 HV7568
 HV7568.Click photographs - Photos may exist for this station.
 HV7568
 HV7568.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7568
 HV7568. The following values were computed from the NAD 83(1993) position.
 HV7568
 HV7568;                    North         East     Units Scale Factor Converg.
 HV7568;SPC MD       -   133,759.642   400,484.909   MT  0.99994985   +0 00 12.6
 HV7568;SPC MD       -   438,843.09  1,313,924.24   sFT  0.99994985   +0 00 12.6
 HV7568;SPC VA N     - 2,134,825.802 3,630,647.628   MT  0.99995820   +0 56 22.8
 HV7568;SPC VA N     - 7,004,007.65 11,911,549.76   sFT  0.99995820   +0 56 22.8
 HV7568;UTM  18      - 4,304,425.254   326,981.316   MT  0.99996863   -1 15 07.1
 HV7568
 HV7568!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7568!SPC MD       -   1.00000493  x   0.99994985  =   0.99995478
 HV7568!SPC VA N     -   1.00000493  x   0.99995820  =   0.99996313
 HV7568!UTM  18      -   1.00000493  x   0.99996863  =   0.99997356
 HV7568
 HV7568:                Primary Azimuth Mark                     Grid Az
 HV7568:SPC MD       -  CANNON USE 1923                          287 25 11.8
 HV7568:SPC VA N     -  CANNON USE 1923                          286 29 01.6
 HV7568:UTM  18      -  CANNON USE 1923                          288 40 31.5
 HV7568
 HV7568_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2698104425(NAD 83)
 HV7568
 HV7568|---------------------------------------------------------------------|
 HV7568| PID    Reference Object                     Distance      Geod. Az  |
 HV7568|                                                           dddmmss.s |
 HV7568| HV7558 BRIDGE USE 1923                     288.832 METERS 07750     |
 HV7568| HV7573 CHICAGO USE 1923                    368.503 METERS 16120     |
 HV7568| HV7566 STICKFOOT USE 1923                  388.877 METERS 21549     |
 HV7568| HV7564 CANNON USE 1923                     413.241 METERS 2872524.4 |
 HV7568|---------------------------------------------------------------------|
 HV7568
 HV7568                          SUPERSEDED SURVEY CONTROL
 HV7568
 HV7568  NAD 83(1991)-  38 52 17.98384(N)    076 59 39.88476(W) AD(       ) 3
 HV7568  NAD 83(1986)-  38 52 17.98332(N)    076 59 39.89590(W) AD(       ) 3
 HV7568  NAD 27      -  38 52 17.58000(N)    076 59 40.98300(W) AD(       ) 3
 HV7568
 HV7568.Superseded values are not recommended for survey control.
 HV7568
 HV7568.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7568.See file dsdata.pdf to determine how the superseded data were derived.
 HV7568
 HV7568
 HV7568  HISTORY     - Date     Condition        Report By
 HV7568  HISTORY     - 1923     MONUMENTED       CGS
 HV7568  HISTORY     - 1958     MARK NOT FOUND   CGS
 HV7568
 HV7568                          STATION DESCRIPTION
 HV7568
 HV7568'DESCRIBED BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7568'A THOROUGH SEARCH WAS MADE ALONG THE SEA WALL FOR THIS UNDESCRIBED
 HV7568'STATION WITHOUT RESULTS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4455 ***********************************************************************
 HV4455  DESIGNATION -  SOLDIERS HOME LIGHTNING ROD
 HV4455  PID         -  HV4455
 HV4455  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4455  COUNTRY     -  US
 HV4455  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4455
 HV4455                         *CURRENT SURVEY CONTROL
 HV4455  ______________________________________________________________________
 HV4455* NAD 83(1993) POSITION- 38 56 29.91518(N) 077 00 39.54654(W)   ADJUSTED
 HV4455  ______________________________________________________________________
 HV4455  GEOID HEIGHT    -        -32.030 (meters)                     GEOID18
 HV4455  LAPLACE CORR    -         -2.66  (seconds)                    DEFLEC18
 HV4455  HORZ ORDER      -  THIRD
 HV4455
 HV4455.The horizontal coordinates were established by classical geodetic methods
 HV4455.and adjusted by the National Geodetic Survey in November 1994.
 HV4455
 HV4455.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4455.GEOID18 height accuracy estimate available here.
 HV4455
 HV4455.Click photographs - Photos may exist for this station.
 HV4455
 HV4455.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4455
 HV4455. The following values were computed from the NAD 83(1993) position.
 HV4455
 HV4455;                    North         East     Units Scale Factor Converg.
 HV4455;SPC MD       -   141,528.095   399,047.662   MT  0.99995051   -0 00 24.8
 HV4455;SPC MD       -   464,330.09  1,309,208.87   sFT  0.99995051   -0 00 24.8
 HV4455;SPC VA N     - 2,142,569.821 3,629,083.628   MT  0.99996435   +0 55 45.6
 HV4455;SPC VA N     - 7,029,414.49 11,906,418.54   sFT  0.99996435   +0 55 45.6
 HV4455;UTM  18      - 4,312,223.520   325,714.726   MT  0.99997404   -1 15 51.4
 HV4455
 HV4455_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2571412223(NAD 83)
 HV4455
 HV4455                          SUPERSEDED SURVEY CONTROL
 HV4455
 HV4455  NAD 83(1991)-  38 56 29.91459(N)    077 00 39.54722(W) AD(       ) 3
 HV4455  NAD 83(1986)-  38 56 29.91371(N)    077 00 39.55778(W) AD(       ) 3
 HV4455  NAD 27      -  38 56 29.52000(N)    077 00 40.64000(W) AD(       ) 3
 HV4455  USSD        -  38 56 29.85500(N)    077 00 40.47600(W) AD(       ) 3
 HV4455
 HV4455.Superseded values are not recommended for survey control.
 HV4455
 HV4455.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4455.See file dsdata.pdf to determine how the superseded data were derived.
 HV4455
 HV4455_MARKER: 84 = LIGHTNING ROD
 HV4455
 HV4455  HISTORY     - Date     Condition        Report By
 HV4455  HISTORY     - 1869     FIRST OBSERVED   COASUR
 HV4455
 HV4455                          STATION DESCRIPTION
 HV4455
 HV4455'NO DESCRIPTIVE TEXT AVAILABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8023 ***********************************************************************
 HV8023  DESIGNATION -  SP 2
 HV8023  PID         -  HV8023
 HV8023  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8023  COUNTRY     -  US
 HV8023  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8023
 HV8023                         *CURRENT SURVEY CONTROL
 HV8023  ______________________________________________________________________
 HV8023* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8023* NAVD 88 ORTHO HEIGHT -    20.383 (meters)       66.87  (feet) ADJUSTED
 HV8023  ______________________________________________________________________
 HV8023  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8023  DYNAMIC HEIGHT  -         20.372 (meters)       66.84  (feet) COMP
 HV8023  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8023
 HV8023  VERT ORDER      -  FIRST     CLASS 0
 HV8023
 HV8023.The horizontal coordinates were scaled from a map and have
 HV8023.an estimated accuracy of +/- 6 seconds.
 HV8023
 HV8023.The orthometric height was determined by differential leveling and
 HV8023.adjusted by the NATIONAL GEODETIC SURVEY
 HV8023.in June 1991.
 HV8023
 HV8023.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8023.GEOID18 height accuracy estimate available here.
 HV8023
 HV8023.Click photographs - Photos may exist for this station.
 HV8023
 HV8023.The dynamic height is computed by dividing the NAVD 88
 HV8023.geopotential number by the normal gravity value computed on the
 HV8023.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8023.degrees latitude (g = 980.6199 gals.).
 HV8023
 HV8023.The modeled gravity was interpolated from observed gravity values.
 HV8023
 HV8023
 HV8023_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8023
 HV8023                          SUPERSEDED SURVEY CONTROL
 HV8023
 HV8023  NGVD 29 (08/12/92)   20.616  (m)           67.64   (f) ADJUSTED    1 0
 HV8023
 HV8023.Superseded values are not recommended for survey control.
 HV8023
 HV8023.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8023.See file dsdata.pdf to determine how the superseded data were derived.
 HV8023
 HV8023_MARKER: Z = SEE DESCRIPTION
 HV8023_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8023_SP_SET: BUILDING
 HV8023_MARK LOGO: NONE
 HV8023_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8023_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8023
 HV8023  HISTORY     - Date     Condition        Report By
 HV8023  HISTORY     - 1949     MONUMENTED       CGS
 HV8023  HISTORY     - 1978     GOOD             NGS
 HV8023  HISTORY     - 1978     GOOD             NGS
 HV8023  HISTORY     - 1982     GOOD             NGS
 HV8023  HISTORY     - 19920615 GOOD             NGS
 HV8023
 HV8023                          STATION DESCRIPTION
 HV8023
 HV8023'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8023'IN WASHINGTON DC.
 HV8023'THE MARK IS 0.8 FT ABOVE GROUND.
 HV8023'AT THE WHITE HOUSE, ON THE BALCONY ABOVE THE SOUTH PORTICO JUST
 HV8023'OUTSIDE THE BLUE ROOM, 14 FEET WEST FROM THE EAST RAIL OF BALCONY,
 HV8023'7.6 FEET WEST FROM THE MOST EASTERLY DOOR
 HV8023'OF BALCONY, 10 FEET NW OF NW CORNER OF MOST WESTERLY PILLAR ON
 HV8023'BALCONY.  WHITE HOUSE WALL MARK.
 HV8023
 HV8023                          STATION RECOVERY (1978)
 HV8023
 HV8023'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8023'THE MARK IS 0.8 FT ABOVE GROUND.
 HV8023'AT THE WHITE HOUSE, ON THE BALCONY ABOVE THE SOUTH PORTICO JUST
 HV8023'OUTSIDE THE BLUE ROOM, 14 FEET WEST FROM THE EAST RAIL OF BALCONY,
 HV8023'7.6 FEET WEST FROM THE MOST EASTERLY DOOR
 HV8023'OF BALCONY, 10 FEET NW OF NW CORNER OF MOST WESTERLY PILLAR ON
 HV8023'BALCONY.  WHITE HOUSE WALL MARK.
 HV8023
 HV8023                          STATION RECOVERY (1982)
 HV8023
 HV8023'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8023'RECOVERED IN GOOD CONDITION.
 HV8023
 HV8023                          STATION RECOVERY (1992)
 HV8023
 HV8023'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8023'IN WASHINGTON, D.C., AT THE WHITE HOUSE, ON THE BALCONY ABOVE THE
 HV8023'SOUTH PORTICO JUST OUTSIDE THE BLUE ROOM, 14 FEET (4.3 M) WEST FROM
 HV8023'THE EAST RAIL OF BALCONY, 7.6 FEET (2.3 M) WEST FROM THE MOST
 HV8023'EASTERLY DOOR OF BALCONY, 10 FEET (3.0 M) NORTHWEST OF NORTHWEST
 HV8023'CORNER OF MOST WESTERLY PILLAR ON BALCONY.  WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8024 ***********************************************************************
 HV8024  DESIGNATION -  SP 5
 HV8024  PID         -  HV8024
 HV8024  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8024  COUNTRY     -  US
 HV8024  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8024
 HV8024                         *CURRENT SURVEY CONTROL
 HV8024  ______________________________________________________________________
 HV8024* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8024* NAVD 88 ORTHO HEIGHT -    20.334 (meters)       66.71  (feet) ADJUSTED
 HV8024  ______________________________________________________________________
 HV8024  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8024  DYNAMIC HEIGHT  -         20.323 (meters)       66.68  (feet) COMP
 HV8024  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8024
 HV8024  VERT ORDER      -  FIRST     CLASS 0
 HV8024
 HV8024.The horizontal coordinates were scaled from a map and have
 HV8024.an estimated accuracy of +/- 6 seconds.
 HV8024
 HV8024.The orthometric height was determined by differential leveling and
 HV8024.adjusted by the NATIONAL GEODETIC SURVEY
 HV8024.in June 1991.
 HV8024
 HV8024.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8024.GEOID18 height accuracy estimate available here.
 HV8024
 HV8024.Click photographs - Photos may exist for this station.
 HV8024
 HV8024.The dynamic height is computed by dividing the NAVD 88
 HV8024.geopotential number by the normal gravity value computed on the
 HV8024.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8024.degrees latitude (g = 980.6199 gals.).
 HV8024
 HV8024.The modeled gravity was interpolated from observed gravity values.
 HV8024
 HV8024
 HV8024_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8024
 HV8024                          SUPERSEDED SURVEY CONTROL
 HV8024
 HV8024  NGVD 29 (08/12/92)   20.567  (m)           67.48   (f) ADJUSTED    1 0
 HV8024
 HV8024.Superseded values are not recommended for survey control.
 HV8024
 HV8024.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8024.See file dsdata.pdf to determine how the superseded data were derived.
 HV8024
 HV8024_MARKER: Z = SEE DESCRIPTION
 HV8024_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8024_SP_SET: BUILDING
 HV8024_MARK LOGO: NONE
 HV8024_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8024_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8024
 HV8024  HISTORY     - Date     Condition        Report By
 HV8024  HISTORY     - 1949     MONUMENTED       CGS
 HV8024  HISTORY     - 1978     GOOD             NGS
 HV8024  HISTORY     - 1978     GOOD             NGS
 HV8024  HISTORY     - 1982     GOOD             NGS
 HV8024  HISTORY     - 19920615 GOOD             NGS
 HV8024
 HV8024                          STATION DESCRIPTION
 HV8024
 HV8024'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8024'IN WASHINGTON DC.
 HV8024'THE MARK IS 0.8 FT ABOVE GROUND.
 HV8024'AT THE WHITE HOUSE, 14 FEET EAST OF WEST RAIL ON BALCONY ABOVE SOUTH
 HV8024'PORTICO, 7 FEET EAST FROM MOST WESTERLY DOOR
 HV8024'OF BALCONY ABOVE SOUTH PORTICO, 10 FEET NE FROM NE CORNER OF MOST
 HV8024'WESTERLY PILLAR ON BALCONY.  WHITE HOUSE WALL MARK.
 HV8024
 HV8024                          STATION RECOVERY (1978)
 HV8024
 HV8024'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8024'THE MARK IS 0.8 FT ABOVE GROUND.
 HV8024'AT THE WHITE HOUSE, 14 FEET EAST OF WEST RAIL ON BALCONY ABOVE SOUTH
 HV8024'PORTICO, 7 FEET EAST FROM MOST WESTERLY DOOR
 HV8024'OF BALCONY ABOVE SOUTH PORTICO, 10 FEET NE FROM NE CORNER OF MOST
 HV8024'WESTERLY PILLAR ON BALCONY.  WHITE HOUSE WALL MARK.
 HV8024
 HV8024                          STATION RECOVERY (1982)
 HV8024
 HV8024'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8024'RECOVERED IN GOOD CONDITION.
 HV8024
 HV8024                          STATION RECOVERY (1992)
 HV8024
 HV8024'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8024'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 14 FEET (4.3 M) EAST OF WEST
 HV8024'RAIL ON BALCONY ABOVE SOUTH PORTICO, 7 FEET (2.1 M) EAST FROM MOST
 HV8024'WESTERLY DOOR OF BALCONY ABOVE SOUTH PORTICO, 10 FEET (3.0 M)
 HV8024'NORTHEAST FROM NORTHEAST CORNER OF MOST WESTERLY PILLAR ON BALCONY.
 HV8024'WHITE HOUSE WALL MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2007 ***********************************************************************
 HV2007  DESIGNATION -  SPEED
 HV2007  PID         -  HV2007
 HV2007  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2007  COUNTRY     -  US
 HV2007  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2007
 HV2007                         *CURRENT SURVEY CONTROL
 HV2007  ______________________________________________________________________
 HV2007* NAD 83(1993) POSITION- 38 53 05.17132(N) 077 02 52.78083(W)   ADJUSTED
 HV2007* NAVD 88 ORTHO HEIGHT -     2.066 (meters)        6.78  (feet) ADJUSTED
 HV2007  ______________________________________________________________________
 HV2007  GEOID HEIGHT    -        -32.081 (meters)                     GEOID18
 HV2007  LAPLACE CORR    -         -2.59  (seconds)                    DEFLEC18
 HV2007  DYNAMIC HEIGHT  -          2.065 (meters)        6.77  (feet) COMP
 HV2007  MODELED GRAVITY -    980,096.0   (mgal)                       NAVD 88
 HV2007
 HV2007  HORZ ORDER      -  THIRD
 HV2007  VERT ORDER      -  FIRST     CLASS II
 HV2007
 HV2007.The horizontal coordinates were established by classical geodetic methods
 HV2007.and adjusted by the National Geodetic Survey in November 1994.
 HV2007
 HV2007.The orthometric height was determined by differential leveling and
 HV2007.adjusted by the NATIONAL GEODETIC SURVEY
 HV2007.in October 2012.
 HV2007
 HV2007.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2007.GEOID18 height accuracy estimate available here.
 HV2007
 HV2007.Click photographs - Photos may exist for this station.
 HV2007
 HV2007.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2007
 HV2007.The dynamic height is computed by dividing the NAVD 88
 HV2007.geopotential number by the normal gravity value computed on the
 HV2007.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2007.degrees latitude (g = 980.6199 gals.).
 HV2007
 HV2007.The modeled gravity was interpolated from observed gravity values.
 HV2007
 HV2007. The following values were computed from the NAD 83(1993) position.
 HV2007
 HV2007;                    North         East     Units Scale Factor Converg.
 HV2007;SPC MD       -   135,215.725   395,835.868   MT  0.99994986   -0 01 48.4
 HV2007;SPC MD       -   443,620.26  1,298,671.51   sFT  0.99994986   -0 01 48.4
 HV2007;SPC VA N     - 2,136,205.739 3,625,975.373   MT  0.99995924   +0 54 22.4
 HV2007;SPC VA N     - 7,008,535.00 11,896,220.87   sFT  0.99995924   +0 54 22.4
 HV2007;UTM  18      - 4,305,982.910   322,365.167   MT  0.99998856   -1 17 09.5
 HV2007
 HV2007!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2007!SPC MD       -   1.00000471  x   0.99994986  =   0.99995457
 HV2007!SPC VA N     -   1.00000471  x   0.99995924  =   0.99996395
 HV2007!UTM  18      -   1.00000471  x   0.99998856  =   0.99999327
 HV2007
 HV2007:                Primary Azimuth Mark                     Grid Az
 HV2007:SPC MD       -  WASHINGTON MONUMENT                      062 52 52.7
 HV2007:SPC VA N     -  WASHINGTON MONUMENT                      061 56 41.9
 HV2007:UTM  18      -  WASHINGTON MONUMENT                      064 08 13.8
 HV2007
 HV2007_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2236505982(NAD 83)
 HV2007
 HV2007|---------------------------------------------------------------------|
 HV2007| PID    Reference Object                     Distance      Geod. Az  |
 HV2007|                                                           dddmmss.s |
 HV2007| HV4421 W P P 5 PB AND PP 1935               59.675 METERS 00511     |
 HV2007| HV4442 WASHINGTON MONUMENT                 APPROX. 1.2 KM 0625104.3 |
 HV2007| HV4279 F B 1913                            131.482 METERS 14154     |
 HV2007| HV4411 REGATTA                             APPROX. 0.6 KM 2351307.7 |
 HV2007| HV3621 ARLINGTON CEMETERY LEE MANSION      APPROX. 2.2 KM 2601756.7 |
 HV2007| HV2008 SPEED RM 1                           42.975 METERS 30502     |
 HV2007|---------------------------------------------------------------------|
 HV2007
 HV2007                          SUPERSEDED SURVEY CONTROL
 HV2007
 HV2007  NAD 83(1991)-  38 53 05.17004(N)    077 02 52.78232(W) AD(       ) 3
 HV2007  NAD 83(1986)-  38 53 05.16974(N)    077 02 52.79289(W) AD(       ) 3
 HV2007  NAD 27      -  38 53 04.77200(N)    077 02 53.86600(W) AD(       ) 3
 HV2007  NAVD 88 (04/20/10)    2.073  (m)            6.80   (f) SUPERSEDED  1 2
 HV2007  NAVD 88 (06/15/91)    2.195  (m)            7.20   (f) SUPERSEDED  1 2
 HV2007  NGVD 29               2.43   (m)            8.0    (f) LEVELING    3  
 HV2007  NGVD 29 (11/26/84)    2.431  (m)            7.98   (f) ADJUSTED    1 2
 HV2007
 HV2007.Superseded values are not recommended for survey control.
 HV2007
 HV2007.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2007.See file dsdata.pdf to determine how the superseded data were derived.
 HV2007
 HV2007_MARKER: DE = TRAVERSE STATION DISK
 HV2007_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV2007_STAMPING: SPEED 1935
 HV2007_MARK LOGO: CGS
 HV2007_PROJECTION: RECESSED 3 CENTIMETERS
 HV2007_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV2007+STABILITY: SURFACE MOTION
 HV2007
 HV2007  HISTORY     - Date     Condition        Report By
 HV2007  HISTORY     - 1935     MONUMENTED       CGS
 HV2007  HISTORY     - 1935     GOOD             CGS
 HV2007  HISTORY     - 1939     GOOD             CGS
 HV2007  HISTORY     - 1946     GOOD             CGS
 HV2007  HISTORY     - 1965     MARK NOT FOUND   CGS
 HV2007  HISTORY     - 1979     GOOD             NGS
 HV2007  HISTORY     - 20081222 GOOD             NGS
 HV2007  HISTORY     - 20120301 GOOD             NGS
 HV2007  HISTORY     - 20141106 GOOD             PROFLN
 HV2007
 HV2007                          STATION DESCRIPTION
 HV2007
 HV2007'DESCRIBED BY COAST AND GEODETIC SURVEY 1935
 HV2007'AT WASHINGTON.
 HV2007'THIS TRAVERSE STATION IS A STANDARD BRONZE DISK STAMPED SPEED
 HV2007'1935 SET IN THE TOP OF A CONCRETE MONUMENT, 8 INCHES IN DIAMETER
 HV2007'AT THE TOP, 12 INCHES SQUARE AT THE BOTTOM, AND 32 INCHES DEEP
 HV2007'WITH THE MARK 3 INCHES BELOW THE GROUND LEVEL, IN THE LAWN 63.0
 HV2007'FEET SW OF THE CENTERLINE OF THE SW GUTTER OF THE DRIVE ON THE
 HV2007'SW SIDE OF THE GOLF PRACTICE COURSE IN WEST POTOMAC PARK, 65.8
 HV2007'FEET NE OF THE WATER FACE OF THE SEA WALL, 110.9 FEET SW OF THE
 HV2007'U.S. PARK SERVICE TRAVERSE MARK WEST POTOMAC PARK NO. 5 107.8
 HV2007'FEET SW OF PARK LAMP POST NO. 353, 32.3 FEET NNW OF THE NORTHERN
 HV2007'SIDE OF A 36-INCH DIAMETER WILLOW TREE, AND 158.0 FEET W OF PARK
 HV2007'LAMP POST NO. 354.  THIS MARK IS THE 1/2-MILE MARK FOR THE 1 MILE
 HV2007'SPEEDBOAT RACE COURSE WITH THE ZERO AT GATE AND THE 1-MILE POINT
 HV2007'AT COURSE.
 HV2007
 HV2007                          STATION RECOVERY (1935)
 HV2007
 HV2007'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (LOC)
 HV2007'THIS TRAVERSE STATION IS A STANDARD BRONZE DISK STAMPED
 HV2007'SPEED 1935 SET IN THE TOP OF A CONCRETE MONUMENT, 8 INCHES
 HV2007'IN DIAMETER AT THE TOP, 12 INCHES SQUARE AT THE BOTTOM, AND
 HV2007'32 INCHES DEEP WITH THE MARK 3 INCHES BELOW THE GROUND LEVEL,
 HV2007'IN THE LAWN 63.0 FEET SW OF THE CENTER LINE OF THE SW GUTTER
 HV2007'OF THE DRIVE ON THE SW SIDE OF THE GOLF PRACTICE COURSE
 HV2007'IN WEST POTOMAC PARK, 65.8 FEET NE OF THE WATER FACE OF THE
 HV2007'SEA WALL, 110.9 FEET SW OF THE U.S. PARK SERVICE TRAVERSE
 HV2007'MARK WEST POTOMAC PARK NO. 5, 107.8 FEET SW OF PARK LAMP POST
 HV2007'NO. 353, 32.3 FEET NNW OF THE NORTHERN SIDE OF A 36-INCH
 HV2007'DIAMETER WILLOW TREE, AND 158.0 FEET W OF PARK LAMP POST
 HV2007'NO. 354.  THIS MARK IS THE 1/2-MILE MARK FOR THE 1 MILE
 HV2007'SPEEDBOAT RACE COURSE WITH THE ZERO AT GATE AND THE
 HV2007'1-MILE POINT AT COURSE.
 HV2007'
 HV2007'REFERENCE MARK NO. 1 IS A STANDARD BRONZE REFERENCE DISK
 HV2007'STAMPED NO. 1 1935 SET IN THE CONCRETE TOP OF THE GRANITE SEA
 HV2007'WALL ALONG WEST POTOMAC PARK 1/2 MILE NW OF THE INLET GATE
 HV2007'BRIDGE OF THE TIDAL BASIN, AND S OF THE COMFORT STATION AT
 HV2007'THE GOLF PRACTICE COURSE IN WEST POTOMAC PARK.  MARK IS
 HV2007'1.2 FEET IN FROM THE WATER FACE OF THE SEA WALL, AND IS
 HV2007'SET ON LINE BETWEEN SPEED AND REGATTA.
 HV2007'
 HV2007'NOTE--DISTANCES MEASURED ON THE GROUND OR SLOPE AS THE CASE
 HV2007'MAY BE.
 HV2007
 HV2007                          STATION RECOVERY (1939)
 HV2007
 HV2007'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV2007'THIS STATION IS MARKED AND DESCRIBED AS A TRAVERSE STATION.
 HV2007'IT SHOULD NOT BE CONFUSED WITH TRIANGULATION STATION SPEED
 HV2007'AT BOLLING FIELD ALSO IN DISTRICT OF COLUMBIA AND ALSO 1935.
 HV2007'
 HV2007'THE STATION MARK WAS RECOVERED IN GOOD CONDITION.  THE DESCRIPTION
 HV2007'IS ADEQUATE.  THE REFERENCE MARK WAS NOT SEARCHED FOR.
 HV2007
 HV2007                          STATION RECOVERY (1946)
 HV2007
 HV2007'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV2007'THE 36-INCH WILLOW REFERRED TO HAS BEEN REMOVED.  STATION
 HV2007'IS 19.6 FEET NNW OF AN 18-INCH WILLOW TREE.  OTHERWISE,
 HV2007'RECOVERED AS DESCRIBED AND IN GOOD CONDITION.
 HV2007
 HV2007                          STATION RECOVERY (1965)
 HV2007
 HV2007'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1965 (DCW)
 HV2007'STATION SEARCHED FOR NOT RECOVERED.
 HV2007
 HV2007                          STATION RECOVERY (1979)
 HV2007
 HV2007'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 (BMP)
 HV2007'THE STATION IS LOCATED IN WASHINGTON D.C. ALONG THE DISTRICT OR
 HV2007'EAST SIDE OF THE POTOMAC RIVER IN WEST POTOMAC PARK.
 HV2007'
 HV2007'TO REACH THE STATION FROM THE LINCOLN MEMORIAL GO SOUTH TO THE
 HV2007'ERICSSON STATUE WHICH IS ON A SMALL TRAFFIC CIRCLE, THEN SOUTH
 HV2007'ALONG THE RIVER ON RIVERSIDE DRIVE 0.29 KM (0.18 MI) TO THE
 HV2007'STATION ON THE RIGHT.
 HV2007'
 HV2007'THE STATION IS A STANDARD BRASS TRAVERSE DISK
 HV2007'STAMPED---SPEED 1935---,
 HV2007'SET IN A ROUND CONCRETE MONUMENT 6 CM BELOW GROUND
 HV2007'LEVEL. THE STATION IS IN THE LAWN 19.7 METERS (64.7 FT) SOUTHWEST
 HV2007'0F THE SOUTHWEST CURB OF THE DRIVE, 19.9 METERS (65.3 FT)
 HV2007'NORTHEAST OF REFERENCE MARK NO. 1 , 9.8 METERS (32.2 FT)
 HV2007'NORTHWEST OF A 0.39 METER WILLOW TREE AND 14.0 METERS (45.9 FT)
 HV2007'SOUTHWEST OF THE CENTER OF AN ASPHALT PATH PARALLEL TO THE ROAD.
 HV2007'
 HV2007'REFERENCE MARK NO. 1 IS A STANDARD CGS REFERENCE MARK DISK
 HV2007'STAMPED NO 1 SET IN THE SEA WALL 0.36 METERS (1.2 FT) FROM THE
 HV2007'WATER.
 HV2007
 HV2007                          STATION RECOVERY (2008)
 HV2007
 HV2007'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV2007'RECOVERED AS DESCRIBED.
 HV2007
 HV2007                          STATION RECOVERY (2012)
 HV2007
 HV2007'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV2007'RECOVERED AS DESCRIBED.
 HV2007
 HV2007                          STATION RECOVERY (2014)
 HV2007
 HV2007'RECOVERY NOTE BY PROFESSIONAL LAND SURVEYOR 2014 (JRO)
 HV2007'A 12 INCH (30 CM) BY 18 INCH PLASTIC VALVE BOX WITH GREEN LID WAS PUT
 HV2007'AROUND THE MARK TODAY IN COOPERATION WITH THE NATIONAL PARK SERVICE.
 HV2007'NEW PHOTOS WERE TAKEN TO SHOW THE BOX.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4721 ***********************************************************************
 HV4721  DESIGNATION -  SPEED
 HV4721  PID         -  HV4721
 HV4721  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4721  COUNTRY     -  US
 HV4721  USGS QUAD   -  ALEXANDRIA (2019)
 HV4721
 HV4721                         *CURRENT SURVEY CONTROL
 HV4721  ______________________________________________________________________
 HV4721* NAD 83(1993) POSITION- 38 50 45.91890(N) 077 01 18.32519(W)   ADJUSTED
 HV4721* NAVD 88 ORTHO HEIGHT -    -0.    (meters)       -0.    (feet) SCALED
 HV4721  ______________________________________________________________________
 HV4721  GEOID HEIGHT    -        -32.185 (meters)                     GEOID18
 HV4721  LAPLACE CORR    -         -2.74  (seconds)                    DEFLEC18
 HV4721  HORZ ORDER      -  SECOND
 HV4721
 HV4721.The horizontal coordinates were established by classical geodetic methods
 HV4721.and adjusted by the National Geodetic Survey in November 1994.
 HV4721
 HV4721.The orthometric height was scaled from a topographic map.
 HV4721
 HV4721.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4721.GEOID18 height accuracy estimate available here.
 HV4721
 HV4721.Click photographs - Photos may exist for this station.
 HV4721
 HV4721.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4721
 HV4721. The following values were computed from the NAD 83(1993) position.
 HV4721
 HV4721;                    North         East     Units Scale Factor Converg.
 HV4721;SPC MD       -   130,920.955   398,111.288   MT  0.99994998   -0 00 49.2
 HV4721;SPC MD       -   429,529.83  1,306,136.78   sFT  0.99994998   -0 00 49.2
 HV4721;SPC VA N     - 2,131,948.691 3,628,320.688   MT  0.99995632   +0 55 21.4
 HV4721;SPC VA N     - 6,994,568.33 11,903,915.46   sFT  0.99995632   +0 55 21.4
 HV4721;UTM  18      - 4,301,639.174   324,546.026   MT  0.99997908   -1 16 06.4
 HV4721
 HV4721!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4721!SPC MD       -   1.00000509  x   0.99994998  =   0.99995507
 HV4721!SPC VA N     -   1.00000509  x   0.99995632  =   0.99996141
 HV4721!UTM  18      -   1.00000509  x   0.99997908  =   0.99998417
 HV4721
 HV4721:                Primary Azimuth Mark                     Grid Az
 HV4721:SPC MD       -  BELL                                     195 11 37.3
 HV4721:SPC VA N     -  BELL                                     194 15 26.7
 HV4721:UTM  18      -  BELL                                     196 26 54.5
 HV4721
 HV4721_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2454601639(NAD 83)
 HV4721
 HV4721|---------------------------------------------------------------------|
 HV4721| PID    Reference Object                     Distance      Geod. Az  |
 HV4721|                                                           dddmmss.s |
 HV4721| DC7182 SPEED RM                             99.064 METERS 09712     |
 HV4721| HV4644 BELL                                APPROX. 2.2 KM 1951048.1 |
 HV4721|---------------------------------------------------------------------|
 HV4721
 HV4721                          SUPERSEDED SURVEY CONTROL
 HV4721
 HV4721  NAD 83(1991)-  38 50 45.91736(N)    077 01 18.32652(W) AD(       ) 2
 HV4721  NAD 83(1986)-  38 50 45.91715(N)    077 01 18.33772(W) AD(       ) 2
 HV4721  NAD 27      -  38 50 45.51300(N)    077 01 19.41700(W) AD(       ) 2
 HV4721  USSD        -  38 50 45.85300(N)    077 01 19.24900(W) AD(       ) 3
 HV4721
 HV4721.Superseded values are not recommended for survey control.
 HV4721
 HV4721.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4721.See file dsdata.pdf to determine how the superseded data were derived.
 HV4721
 HV4721_MARKER: Z = SEE DESCRIPTION
 HV4721_SETTING: 0 = UNSPECIFIED SETTING
 HV4721
 HV4721  HISTORY     - Date     Condition        Report By
 HV4721  HISTORY     - 1922     MONUMENTED       CGS
 HV4721  HISTORY     - 1928     MARK NOT FOUND   CGS
 HV4721  HISTORY     - 1932     MARK NOT FOUND   CGS
 HV4721
 HV4721                          STATION DESCRIPTION
 HV4721
 HV4721'DESCRIBED BY COAST AND GEODETIC SURVEY 1922 (HPO)
 HV4721'STATION IS THE CENTER OF THE MAST OF THE W TARGET MARKING THE
 HV4721'N RANGE OF THE SPEED TRIAL COURSE.  THE MAST CONSISTS OF A
 HV4721'4- BY 4-INCH TIMBER, SECURELY NAILED TO THE PILING AT THE SW
 HV4721'CORNER OF THE WHARF BELONGING TO THE FIRTH STERLING STEEL
 HV4721'COMPANY.
 HV4721'
 HV4721'REFERENCE MARK IS A STANDARD BRONZE DISK SET IN CONCRETE.
 HV4721'
 HV4721'THE REFERENCE MARK IS 1 METER N OF THE BRICK POWER-HOUSE NEAR
 HV4721'THE FOOT OF THE WHARF.
 HV4721
 HV4721                          STATION RECOVERY (1928)
 HV4721
 HV4721'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1928 (SAB)
 HV4721'UNABLE TO LOCATE STATION.  WHARF IS PRETTY WELL ROTTED AWAY.
 HV4721
 HV4721                          STATION RECOVERY (1932)
 HV4721
 HV4721'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1932 (JPL)
 HV4721'UNABLE TO LOCATE STATION.  WHARF, AS MENTIONED IN ORIGINAL
 HV4721'DESCRIPTION, IS ENTIRELY ROTTED AWAY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2008 ***********************************************************************
 HV2008  DESIGNATION -  SPEED RM 1
 HV2008  PID         -  HV2008
 HV2008  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2008  COUNTRY     -  US
 HV2008  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2008
 HV2008                         *CURRENT SURVEY CONTROL
 HV2008  ______________________________________________________________________
 HV2008* NAD 83(1993) POSITION- 38 53 04.80182(N) 077 02 53.46124(W)   ADJUSTED
 HV2008* NAVD 88 ORTHO HEIGHT -     0.882 (meters)        2.89  (feet) ADJUSTED
 HV2008  ______________________________________________________________________
 HV2008  GEOID HEIGHT    -        -32.081 (meters)                     GEOID18
 HV2008  LAPLACE CORR    -         -2.60  (seconds)                    DEFLEC18
 HV2008  DYNAMIC HEIGHT  -          0.881 (meters)        2.89  (feet) COMP
 HV2008  MODELED GRAVITY -    980,096.0   (mgal)                       NAVD 88
 HV2008
 HV2008  HORZ ORDER      -  THIRD
 HV2008  VERT ORDER      -  FIRST     CLASS II
 HV2008
 HV2008.The horizontal coordinates were established by classical geodetic methods
 HV2008.and adjusted by the National Geodetic Survey in November 1994.
 HV2008
 HV2008.The orthometric height was determined by differential leveling and
 HV2008.adjusted by the NATIONAL GEODETIC SURVEY
 HV2008.in October 2012.
 HV2008
 HV2008.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2008.GEOID18 height accuracy estimate available here.
 HV2008
 HV2008.Click photographs - Photos may exist for this station.
 HV2008
 HV2008.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2008
 HV2008.The dynamic height is computed by dividing the NAVD 88
 HV2008.geopotential number by the normal gravity value computed on the
 HV2008.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2008.degrees latitude (g = 980.6199 gals.).
 HV2008
 HV2008.The modeled gravity was interpolated from observed gravity values.
 HV2008
 HV2008. The following values were computed from the NAD 83(1993) position.
 HV2008
 HV2008;                    North         East     Units Scale Factor Converg.
 HV2008;SPC MD       -   135,204.340   395,819.463   MT  0.99994986   -0 01 48.9
 HV2008;SPC MD       -   443,582.91  1,298,617.69   sFT  0.99994986   -0 01 48.9
 HV2008;UTM  18      - 4,305,971.887   322,348.516   MT  0.99998864   -1 17 09.9
 HV2008
 HV2008!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2008!SPC MD       -   1.00000490  x   0.99994986  =   0.99995475
 HV2008!UTM  18      -   1.00000490  x   0.99998864  =   0.99999354
 HV2008
 HV2008_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2234805971(NAD 83)
 HV2008
 HV2008                          SUPERSEDED SURVEY CONTROL
 HV2008
 HV2008  NAD 83(1991)-  38 53 04.80054(N)    077 02 53.46273(W) AD(       ) 3
 HV2008  NAD 83(1986)-  38 53 04.80025(N)    077 02 53.47330(W) AD(       ) 3
 HV2008  NAD 27      -  38 53 04.40252(N)    077 02 54.54641(W) AD(       ) 3
 HV2008  NAVD 88 (04/20/10)    0.888  (m)            2.91   (f) SUPERSEDED  1 2
 HV2008  NAVD 88 (06/15/91)    1.017  (m)            3.34   (f) SUPERSEDED  1 2
 HV2008  NGVD 29               1.25   (m)            4.1    (f) LEVELING    3  
 HV2008  NGVD 29 (11/26/84)    1.253  (m)            4.11   (f) ADJUSTED    1 2
 HV2008
 HV2008.Superseded values are not recommended for survey control.
 HV2008
 HV2008.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2008.See file dsdata.pdf to determine how the superseded data were derived.
 HV2008
 HV2008_MARKER: DR = REFERENCE MARK DISK
 HV2008_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV2008_SP_SET: SEA WALL
 HV2008_STAMPING: NO 1 1935
 HV2008_MARK LOGO: CGS
 HV2008_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2008_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV2008+SATELLITE: SATELLITE OBSERVATIONS - March 01, 2012
 HV2008
 HV2008  HISTORY     - Date     Condition        Report By
 HV2008  HISTORY     - 1935     MONUMENTED       CGS
 HV2008  HISTORY     - 20081118 GOOD             NGS
 HV2008  HISTORY     - 20081222 GOOD             NGS
 HV2008  HISTORY     - 20120301 GOOD             NGS
 HV2008
 HV2008                          STATION DESCRIPTION
 HV2008
 HV2008'DESCRIBED BY COAST AND GEODETIC SURVEY 1935
 HV2008'AT WASHINGTON.
 HV2008'AT STANDARD BRONZE REFERENCE DISK STAMPED NO. 1 1935 SET IN THE
 HV2008'CONCRETE TOP OF THE GRANITE SEA WALL ALONG WEST POTOMAC PARK
 HV2008'1/2 MILE NW OF THE INLET GATE BRIDGE OF THE TIDAL BASIN, AND S
 HV2008'OF THE COMFORT STATION AT THE GOLF PRACTICE COURSE IN WEST
 HV2008'POTOMAC PARK.  MARK IS 1.2 FEET IN FROM THE WATER FACE OF THE SEA
 HV2008'WALL, AND 65 FEET SW OF SPEED.
 HV2008
 HV2008                          STATION RECOVERY (2008)
 HV2008
 HV2008'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DRD)
 HV2008'RECOVERED IN GOOD CONDITION.
 HV2008
 HV2008                          STATION RECOVERY (2008)
 HV2008
 HV2008'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV2008'RECOVERED AS DESCRIBED.
 HV2008
 HV2008                          STATION RECOVERY (2012)
 HV2008
 HV2008'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV2008'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4444 ***********************************************************************
 HV4444  DESIGNATION -  SQUARE
 HV4444  PID         -  HV4444
 HV4444  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4444  COUNTRY     -  US
 HV4444  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4444
 HV4444                         *CURRENT SURVEY CONTROL
 HV4444  ______________________________________________________________________
 HV4444* NAD 83(1993) POSITION- 38 57 38.03755(N) 077 01 50.47932(W)   ADJUSTED
 HV4444  ______________________________________________________________________
 HV4444  GEOID HEIGHT    -        -31.992 (meters)                     GEOID18
 HV4444  LAPLACE CORR    -         -2.34  (seconds)                    DEFLEC18
 HV4444  HORZ ORDER      -  THIRD
 HV4444
 HV4444.The horizontal coordinates were established by classical geodetic methods
 HV4444.and adjusted by the National Geodetic Survey in November 1994.
 HV4444
 HV4444.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4444.GEOID18 height accuracy estimate available here.
 HV4444
 HV4444.Click photographs - Photos may exist for this station.
 HV4444
 HV4444.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4444
 HV4444. The following values were computed from the NAD 83(1993) position.
 HV4444
 HV4444;                    North         East     Units Scale Factor Converg.
 HV4444;SPC MD       -   143,629.096   397,340.204   MT  0.99995094   -0 01 09.3
 HV4444;SPC MD       -   471,223.13  1,303,606.99   sFT  0.99995094   -0 01 09.3
 HV4444;SPC VA N     - 2,144,642.673 3,627,342.042   MT  0.99996627   +0 55 01.3
 HV4444;SPC VA N     - 7,036,215.17 11,900,704.68   sFT  0.99996627   +0 55 01.3
 HV4444;UTM  18      - 4,314,361.549   324,053.748   MT  0.99998120   -1 16 37.9
 HV4444
 HV4444_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2405314361(NAD 83)
 HV4444
 HV4444                          SUPERSEDED SURVEY CONTROL
 HV4444
 HV4444  NAD 83(1991)-  38 57 38.03689(N)    077 01 50.48030(W) AD(       ) 3
 HV4444  NAD 83(1986)-  38 57 38.03618(N)    077 01 50.49047(W) AD(       ) 3
 HV4444  NAD 27      -  38 57 37.64200(N)    077 01 51.57400(W) AD(       ) 3
 HV4444
 HV4444.Superseded values are not recommended for survey control.
 HV4444
 HV4444.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4444.See file dsdata.pdf to determine how the superseded data were derived.
 HV4444
 HV4444_MARKER: 87 = DOME
 HV4444
 HV4444  HISTORY     - Date     Condition        Report By
 HV4444  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4444  HISTORY     - 1971     GOOD             NGS
 HV4444
 HV4444                          STATION DESCRIPTION
 HV4444
 HV4444'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4444'THE STATION IS THE FINIAL DOME ON SQUARE CUPOLA ON BRIGHTWOOD
 HV4444'SCHOOL LOCATED ON N SIDE OF NICHOLSON STREET BETWEEN THIRTEENTH
 HV4444'AND FOURTEENTH STREETS, N.W.
 HV4444
 HV4444                          STATION RECOVERY (1971)
 HV4444
 HV4444'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4444'THE STATION WAS RECOVERED AS DESCRIBED IS ON THE TOP OF THE
 HV4444'BRIGHTWOOD ELEMENTARY SCHOOL AND HAS AN OVERALL HEIGHT OF
 HV4444'APPROXIMATELY 90 FEET.
 HV4444'
 HV4444'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DIST. OF
 HV4444'COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4358 ***********************************************************************
 HV4358  DESIGNATION -  ST DOMINIC CHURCH SPIRE
 HV4358  PID         -  HV4358
 HV4358  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4358  COUNTRY     -  US
 HV4358  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4358
 HV4358                         *CURRENT SURVEY CONTROL
 HV4358  ______________________________________________________________________
 HV4358* NAD 83(1993) POSITION- 38 52 58.95447(N) 077 01 12.58452(W)   ADJUSTED
 HV4358  ______________________________________________________________________
 HV4358  GEOID HEIGHT    -        -32.123 (meters)                     GEOID18
 HV4358  LAPLACE CORR    -         -2.96  (seconds)                    DEFLEC18
 HV4358  HORZ ORDER      -  THIRD
 HV4358
 HV4358.The horizontal coordinates were established by classical geodetic methods
 HV4358.and adjusted by the National Geodetic Survey in November 1994.
 HV4358
 HV4358.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4358.GEOID18 height accuracy estimate available here.
 HV4358
 HV4358.Click photographs - Photos may exist for this station.
 HV4358
 HV4358.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4358
 HV4358. The following values were computed from the NAD 83(1993) position.
 HV4358
 HV4358;                    North         East     Units Scale Factor Converg.
 HV4358;SPC MD       -   135,023.124   398,250.623   MT  0.99994986   -0 00 45.6
 HV4358;SPC MD       -   442,988.37  1,306,593.92   sFT  0.99994986   -0 00 45.6
 HV4358;SPC VA N     - 2,136,052.621 3,628,392.976   MT  0.99995910   +0 55 24.9
 HV4358;SPC VA N     - 7,008,032.64 11,904,152.62   sFT  0.99995910   +0 55 24.9
 HV4358;UTM  18      - 4,305,737.424   324,775.201   MT  0.99997809   -1 16 06.4
 HV4358
 HV4358_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2477505737(NAD 83)
 HV4358
 HV4358                          SUPERSEDED SURVEY CONTROL
 HV4358
 HV4358  NAD 83(1991)-  38 52 58.95324(N)    077 01 12.58584(W) AD(       ) 3
 HV4358  NAD 83(1986)-  38 52 58.95277(N)    077 01 12.59659(W) AD(       ) 3
 HV4358  NAD 27      -  38 52 58.54900(N)    077 01 13.67200(W) AD(       ) 3
 HV4358  USSD        -  38 52 58.88200(N)    077 01 13.50600(W) AD(       ) 3
 HV4358
 HV4358.Superseded values are not recommended for survey control.
 HV4358
 HV4358.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4358.See file dsdata.pdf to determine how the superseded data were derived.
 HV4358
 HV4358_MARKER: 90 = CHURCH SPIRE
 HV4358_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV4358+SATELLITE: SATELLITE OBSERVATIONS - May 06, 2006
 HV4358
 HV4358  HISTORY     - Date     Condition        Report By
 HV4358  HISTORY     - 1913     FIRST OBSERVED   CGS
 HV4358  HISTORY     - 1928     GOOD             CGS
 HV4358  HISTORY     - 1939     GOOD             CGS
 HV4358  HISTORY     - 1959     GOOD             CGS
 HV4358  HISTORY     - 1971     GOOD             NGS
 HV4358  HISTORY     - 1974     GOOD             NGS
 HV4358  HISTORY     - 1979     GOOD             NGS
 HV4358  HISTORY     - 20020902 GOOD             GEOCAC
 HV4358  HISTORY     - 20050718 GOOD             USPSQD
 HV4358  HISTORY     - 20060506 GOOD             GEOCAC
 HV4358  HISTORY     - 20100521 GOOD             GEOCAC
 HV4358
 HV4358                          STATION DESCRIPTION
 HV4358
 HV4358'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4358'THIS STATION IS THE TALL SPIRE ON ST. DOMINIC CHURCH, AT SW CORNER
 HV4358'OF 6TH AND E STREETS, SW.
 HV4358
 HV4358                          STATION RECOVERY (1928)
 HV4358
 HV4358'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1928 (EOH)
 HV4358'THIS STATION IS LOCATED ON TOP OF ST. DOMINICS CHURCH, 6TH AND E
 HV4358'STREETS, SW.  IT IS AT THE TOP OF THE HIGH CHURCH STEEPLE, IN A
 HV4358'WSW DIRECTION, AND ABOUT 1 MILE DISTANT FROM U.S.C. AND G.S.
 HV4358'OFFICE, WITH A LOWER CHURCH STEEPLE, SPIRE A ABOUT MIDWAY BETWEEN,
 HV4358'AND ALMOST IN LINE WITH SAME.  THIS SPIRE B IS ABOUT 31 DEG
 HV4358'TO THE LEFT OF THE WASHINGTON MONUMENT, WHEN VIEWED FROM
 HV4358'STATION SURVEY LOCATED ON TOP OF THE U.S.C. AND G.S. BUILDING.
 HV4358'
 HV4358'THE POINT TAKEN IS THE BOTTOM OF THE UPRIGHT ROD WHERE IT
 HV4358'PROJECTS ABOVE THE POINT OF THE MAIN PART OF THE STEEPLE.  THIS
 HV4358'SPIRE IS ON THE NE CORNER OF THE CHURCH, WHICH FACES E, AND WHICH
 HV4358'ALSO HAS A SMALLER SPIRE, OR STEEPLE, ON THE SE CORNER.
 HV4358
 HV4358                          STATION RECOVERY (1939)
 HV4358
 HV4358'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4358'STATION RECOVERED INTACT.  THE SPIRE IS ON THE NE CORNER OF THE
 HV4358'CHURCH AND IS ABOUT 100 FEET HIGH.  THE CHURCH IS ON THE SW
 HV4358'CORNER OF 6TH AND E STREETS SW.
 HV4358
 HV4358                          STATION RECOVERY (1959)
 HV4358
 HV4358'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (JKR)
 HV4358'STATION RECOVERED IN GOOD CONDITION AS DESCRIBED.
 HV4358
 HV4358                          STATION RECOVERY (1971)
 HV4358
 HV4358'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4358'STATION WAS RECOVERED AS PREVIOUSLY DESCRIBED.
 HV4358'
 HV4358'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DISTRICT OF
 HV4358'COLUMBIA.
 HV4358
 HV4358                          STATION RECOVERY (1974)
 HV4358
 HV4358'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974 (GWJ)
 HV4358'STATION RECOVERED AS DESCRIBED.
 HV4358'
 HV4358'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4358'IN DC.
 HV4358
 HV4358                          STATION RECOVERY (1979)
 HV4358
 HV4358'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 (BMP)
 HV4358'THE STATION IS THE SPIRE ON THE NORTHEAST CORNER OF THE CATHOLIC
 HV4358'CHURCH AT 6TH AND E STREETS IN SOUTHWEST WASHINGTON. THE SPIRE IS
 HV4358'TALL AND THIN AND THE HIGHEST IN THAT AREA OF THE CITY. THERE IS
 HV4358'A CROSS ON THE SPIRE AND WAS THE POINT OBSERVED.
 HV4358
 HV4358                          STATION RECOVERY (2002)
 HV4358
 HV4358'RECOVERY NOTE BY GEOCACHING 2002 (APC)
 HV4358'RECOVERED IN GOOD CONDITION.
 HV4358
 HV4358                          STATION RECOVERY (2005)
 HV4358
 HV4358'RECOVERY NOTE BY US POWER SQUADRON 2005 (FM)
 HV4358'RECOVERED IN GOOD CONDITION.
 HV4358
 HV4358                          STATION RECOVERY (2006)
 HV4358
 HV4358'RECOVERY NOTE BY GEOCACHING 2006 (JER)
 HV4358'RECOVERED IN GOOD CONDITION.
 HV4358
 HV4358                          STATION RECOVERY (2010)
 HV4358
 HV4358'RECOVERY NOTE BY GEOCACHING 2010 (MTT)
 HV4358'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4724 ***********************************************************************
 HV4724  DESIGNATION -  ST ELIZABETHS ASYLUM WHITE STK
 HV4724  PID         -  HV4724
 HV4724  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4724  COUNTRY     -  US
 HV4724  USGS QUAD   -  ANACOSTIA (2016)
 HV4724
 HV4724                         *CURRENT SURVEY CONTROL
 HV4724  ______________________________________________________________________
 HV4724* NAD 83(1993) POSITION- 38 51 07.88954(N) 076 59 59.51836(W)   ADJUSTED
 HV4724  ______________________________________________________________________
 HV4724  GEOID HEIGHT    -        -32.205 (meters)                     GEOID18
 HV4724  LAPLACE CORR    -         -2.67  (seconds)                    DEFLEC18
 HV4724  HORZ ORDER      -  THIRD
 HV4724
 HV4724.The horizontal coordinates were established by classical geodetic methods
 HV4724.and adjusted by the National Geodetic Survey in November 1994.
 HV4724
 HV4724.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4724.GEOID18 height accuracy estimate available here.
 HV4724
 HV4724.Click photographs - Photos may exist for this station.
 HV4724
 HV4724.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4724
 HV4724. The following values were computed from the NAD 83(1993) position.
 HV4724
 HV4724;                    North         East     Units Scale Factor Converg.
 HV4724;SPC MD       -   131,598.201   400,011.613   MT  0.99994993   +0 00 00.3
 HV4724;SPC MD       -   431,751.76  1,312,371.43   sFT  0.99994993   +0 00 00.3
 HV4724;SPC VA N     - 2,132,656.901 3,630,209.706   MT  0.99995675   +0 56 10.5
 HV4724;SPC VA N     - 6,996,891.85 11,910,113.01   sFT  0.99995675   +0 56 10.5
 HV4724;UTM  18      - 4,302,274.657   326,460.775   MT  0.99997085   -1 15 17.5
 HV4724
 HV4724_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2646002274(NAD 83)
 HV4724
 HV4724                          SUPERSEDED SURVEY CONTROL
 HV4724
 HV4724  NAD 83(1991)-  38 51 07.88805(N)    076 59 59.51947(W) AD(       ) 3
 HV4724  NAD 83(1986)-  38 51 07.88775(N)    076 59 59.53079(W) AD(       ) 3
 HV4724  NAD 27      -  38 51 07.48400(N)    077 00 00.61900(W) AD(       ) 3
 HV4724
 HV4724.Superseded values are not recommended for survey control.
 HV4724
 HV4724.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4724.See file dsdata.pdf to determine how the superseded data were derived.
 HV4724
 HV4724_MARKER: 63 = STACK
 HV4724
 HV4724  HISTORY     - Date     Condition        Report By
 HV4724  HISTORY     - 1934     FIRST OBSERVED   CGS
 HV4724  HISTORY     - 1938     GOOD             CGS
 HV4724  HISTORY     - 1958     GOOD             CGS
 HV4724  HISTORY     - 1972     GOOD             NGS
 HV4724  HISTORY     - 1974     GOOD             NGS
 HV4724  HISTORY     - 20030901 GOOD             GEOCAC
 HV4724
 HV4724                          STATION DESCRIPTION
 HV4724
 HV4724'DESCRIBED BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4724'STATION RECOVERED.
 HV4724
 HV4724                          STATION RECOVERY (1958)
 HV4724
 HV4724'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV4724'THE STATION WAS RECOVERED IN GOOD CONDITION.  IT IS THE MOST
 HV4724'EASTLY OF TWO TALL STACKS AT THE ST. ELIZABETH INSANE ASYLUM
 HV4724'IN WASHINGTON D.C. BOTH STACKS ARE PAINTED RED AND WHITE.
 HV4724'
 HV4724'DESCRIBED BY-- R.S.T.
 HV4724
 HV4724                          STATION RECOVERY (1972)
 HV4724
 HV4724'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1972 (RDO)
 HV4724'STATION RECOVERED IN GOOD CONDITION AS DESCRIBED BY J.P.R. IN 1958.
 HV4724
 HV4724                          STATION RECOVERY (1974)
 HV4724
 HV4724'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974 (GWJ)
 HV4724'STATION RECOVERED AS DESCRIBED IN 1958.
 HV4724
 HV4724                          STATION RECOVERY (2003)
 HV4724
 HV4724'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV4724'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4726 ***********************************************************************
 HV4726  DESIGNATION -  ST ELIZABETHS ASYLUM RED STK
 HV4726  PID         -  HV4726
 HV4726  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4726  COUNTRY     -  US
 HV4726  USGS QUAD   -  ANACOSTIA (2016)
 HV4726
 HV4726                         *CURRENT SURVEY CONTROL
 HV4726  ______________________________________________________________________
 HV4726* NAD 83(1993) POSITION- 38 51 07.14378(N) 077 00 00.88163(W)   ADJUSTED
 HV4726  ______________________________________________________________________
 HV4726  GEOID HEIGHT    -        -32.205 (meters)                     GEOID18
 HV4726  LAPLACE CORR    -         -2.66  (seconds)                    DEFLEC18
 HV4726  HORZ ORDER      -  THIRD
 HV4726
 HV4726.The horizontal coordinates were established by classical geodetic methods
 HV4726.and adjusted by the National Geodetic Survey in November 1994.
 HV4726
 HV4726.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4726.GEOID18 height accuracy estimate available here.
 HV4726
 HV4726.Click photographs - Photos may exist for this station.
 HV4726
 HV4726.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4726
 HV4726. The following values were computed from the NAD 83(1993) position.
 HV4726
 HV4726;                    North         East     Units Scale Factor Converg.
 HV4726;SPC MD       -   131,575.205   399,978.742   MT  0.99994993   -0 00 00.6
 HV4726;SPC MD       -   431,676.32  1,312,263.59   sFT  0.99994993   -0 00 00.6
 HV4726;SPC VA N     - 2,132,633.371 3,630,177.215   MT  0.99995674   +0 56 09.7
 HV4726;SPC VA N     - 6,996,814.65 11,910,006.41   sFT  0.99995674   +0 56 09.7
 HV4726;UTM  18      - 4,302,252.386   326,427.408   MT  0.99997100   -1 15 18.3
 HV4726
 HV4726_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2642702252(NAD 83)
 HV4726
 HV4726                          SUPERSEDED SURVEY CONTROL
 HV4726
 HV4726  NAD 83(1991)-  38 51 07.14230(N)    077 00 00.88279(W) AD(       ) 3
 HV4726  NAD 83(1986)-  38 51 07.14195(N)    077 00 00.89409(W) AD(       ) 3
 HV4726  NAD 27      -  38 51 06.73900(N)    077 00 01.98200(W) AD(       ) 3
 HV4726  USSD        -  38 51 07.07400(N)    077 00 01.79600(W) AD(       ) 3
 HV4726
 HV4726.Superseded values are not recommended for survey control.
 HV4726
 HV4726.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4726.See file dsdata.pdf to determine how the superseded data were derived.
 HV4726
 HV4726_MARKER: 63 = STACK
 HV4726
 HV4726  HISTORY     - Date     Condition        Report By
 HV4726  HISTORY     - 1913     FIRST OBSERVED   CGS
 HV4726  HISTORY     - 1938     GOOD             CGS
 HV4726  HISTORY     - 1940     GOOD             CGS
 HV4726  HISTORY     - 1972     GOOD             NGS
 HV4726  HISTORY     - 1974     GOOD             NGS
 HV4726  HISTORY     - 20030901 GOOD             GEOCAC
 HV4726
 HV4726                          STATION DESCRIPTION
 HV4726
 HV4726'DESCRIBED BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4726'STATION RECOVERED.
 HV4726
 HV4726                          STATION RECOVERY (1940)
 HV4726
 HV4726'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV4726'STATION RECOVERED INTACT.  THIS IS THE SAME OBJECT AS STATION
 HV4726'ST. ELIZABETHS INSANE ASYLUM, RED STACK, WHICH WAS USED BY
 HV4726'J.B. JR. IN 1934.
 HV4726
 HV4726                          STATION RECOVERY (1972)
 HV4726
 HV4726'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1972 (RDO)
 HV4726'STATION RECOVERED IN GOOD CONDITION.  IT IS THE MOST WESTERLY OF
 HV4726'TWO TALL STACKS AT THE ST. ELIZABETH INSANE ASYLUM.  BOTH STACKS
 HV4726'ARE PAINTED RED AND WHITE.
 HV4726
 HV4726                          STATION RECOVERY (1974)
 HV4726
 HV4726'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974 (GWJ)
 HV4726'STATION RECOVERED.
 HV4726'
 HV4726'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4726'IN DC.
 HV4726
 HV4726                          STATION RECOVERY (2003)
 HV4726
 HV4726'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV4726'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4437 ***********************************************************************
 HV4437  DESIGNATION -  ST MATTHEWS CH CROSS ON DOME
 HV4437  PID         -  HV4437
 HV4437  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4437  COUNTRY     -  US
 HV4437  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4437
 HV4437                         *CURRENT SURVEY CONTROL
 HV4437  ______________________________________________________________________
 HV4437* NAD 83(1993) POSITION- 38 54 23.14232(N) 077 02 25.03007(W)   ADJUSTED
 HV4437  ______________________________________________________________________
 HV4437  GEOID HEIGHT    -        -32.049 (meters)                     GEOID18
 HV4437  LAPLACE CORR    -         -2.13  (seconds)                    DEFLEC18
 HV4437  HORZ ORDER      -  THIRD
 HV4437
 HV4437.The horizontal coordinates were established by classical geodetic methods
 HV4437.and adjusted by the National Geodetic Survey in November 1994.
 HV4437
 HV4437.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4437.GEOID18 height accuracy estimate available here.
 HV4437
 HV4437.Click photographs - Photos may exist for this station.
 HV4437
 HV4437.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4437
 HV4437. The following values were computed from the NAD 83(1993) position.
 HV4437
 HV4437;                    North         East     Units Scale Factor Converg.
 HV4437;SPC MD       -   137,619.679   396,505.740   MT  0.99994999   -0 01 31.0
 HV4437;SPC MD       -   451,507.23  1,300,869.25   sFT  0.99994999   -0 01 31.0
 HV4437;SPC VA N     - 2,138,620.343 3,626,605.879   MT  0.99996107   +0 54 39.7
 HV4437;SPC VA N     - 7,016,456.91 11,898,289.45   sFT  0.99996107   +0 54 39.7
 HV4437;UTM  18      - 4,308,371.690   323,087.605   MT  0.99998541   -1 16 54.2
 HV4437
 HV4437_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2308708371(NAD 83)
 HV4437
 HV4437                          SUPERSEDED SURVEY CONTROL
 HV4437
 HV4437  NAD 83(1991)-  38 54 23.14121(N)    077 02 25.03138(W) AD(       ) 3
 HV4437  NAD 83(1986)-  38 54 23.14072(N)    077 02 25.04183(W) AD(       ) 3
 HV4437  NAD 27      -  38 54 22.74200(N)    077 02 26.12000(W) AD(       ) 3
 HV4437  USSD        -  38 54 23.07700(N)    077 02 25.95600(W) AD(       ) 3
 HV4437
 HV4437.Superseded values are not recommended for survey control.
 HV4437
 HV4437.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4437.See file dsdata.pdf to determine how the superseded data were derived.
 HV4437
 HV4437_MARKER: 91 = CHURCH CROSS
 HV4437_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV4437+SATELLITE: SATELLITE OBSERVATIONS - March 19, 2009
 HV4437
 HV4437  HISTORY     - Date     Condition        Report By
 HV4437  HISTORY     - 1913     FIRST OBSERVED   CGS
 HV4437  HISTORY     - 1939     GOOD             CGS
 HV4437  HISTORY     - 1959     GOOD             CGS
 HV4437  HISTORY     - 1961     GOOD             CGS
 HV4437  HISTORY     - 1971     GOOD             NGS
 HV4437  HISTORY     - 20030529 GOOD             GEOCAC
 HV4437  HISTORY     - 20050718 GOOD             USPSQD
 HV4437  HISTORY     - 20090319 GOOD             GEOCAC
 HV4437  HISTORY     - 20201104 GOOD             NGS
 HV4437
 HV4437                          STATION DESCRIPTION
 HV4437
 HV4437'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4437'STATION IS THE CENTER OF THE CROSS ON THE TOP OF THE LARGE
 HV4437'YELLOW DOME OF ST. MATTHEWS CATHOLIC CHURCH OF RHODE ISLAND
 HV4437'AVENUE NEAR CONNECTICUT AVENUE, NW.
 HV4437
 HV4437                          STATION RECOVERY (1939)
 HV4437
 HV4437'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4437'THE CHURCH (CATHOLIC) IS LOCATED ON THE N SIDE OF RHODE
 HV4437'ISLAND AVENUE, BETWEEN CONNECTICUT AVENUE AND 17TH STREET,
 HV4437'NW.  THE DOME IS VERY PROMINENT, AND IS AN OUTSTANDING LANDMARK
 HV4437'FOR THAT PART OF THE CITY.
 HV4437
 HV4437                          STATION RECOVERY (1959)
 HV4437
 HV4437'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (JKR)
 HV4437'STATION RECOVERED IN GOOD CONDITION AS DESCRIBED.
 HV4437
 HV4437                          STATION RECOVERY (1961)
 HV4437
 HV4437'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1961 (JPP)
 HV4437'STATION RECOVERED AS DESCRIBED.
 HV4437
 HV4437                          STATION RECOVERY (1971)
 HV4437
 HV4437'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4437'STATION RECOVERED AS DESCRIBED IN GOOD CONDITION.
 HV4437
 HV4437                          STATION RECOVERY (2003)
 HV4437
 HV4437'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV4437'STRUCTURE IS PROPERLY KNOWN AS ST. MATTHEW'S CATHEDRAL (NOT CHURCH),
 HV4437'AND DOME IS A DARKENED COPPER COLOR (NOT YELLOW), CORRECTING THE 1913
 HV4437'DESCRIPTION.
 HV4437
 HV4437                          STATION RECOVERY (2005)
 HV4437
 HV4437'RECOVERY NOTE BY US POWER SQUADRON 2005 (FM)
 HV4437'RECOVERED IN GOOD CONDITION.
 HV4437
 HV4437                          STATION RECOVERY (2009)
 HV4437
 HV4437'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV4437'RECOVERED IN GOOD CONDITION.
 HV4437
 HV4437                          STATION RECOVERY (2020)
 HV4437
 HV4437'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JKH)
 HV4437'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4387 ***********************************************************************
 HV4387  DESIGNATION -  STANDARDS 2
 HV4387  PID         -  HV4387
 HV4387  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4387  COUNTRY     -  US
 HV4387  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4387
 HV4387                         *CURRENT SURVEY CONTROL
 HV4387  ______________________________________________________________________
 HV4387* NAD 83(1993) POSITION- 38 56 30.11075(N) 077 03 57.74103(W)   ADJUSTED
 HV4387* NAVD 88 ORTHO HEIGHT -   107.    (meters)      351.    (feet) SCALED
 HV4387  ______________________________________________________________________
 HV4387  GEOID HEIGHT    -        -31.963 (meters)                     GEOID18
 HV4387  LAPLACE CORR    -         -3.12  (seconds)                    DEFLEC18
 HV4387  HORZ ORDER      -  FIRST
 HV4387
 HV4387.The horizontal coordinates were established by classical geodetic methods
 HV4387.and adjusted by the National Geodetic Survey in November 1994.
 HV4387
 HV4387.The orthometric height was scaled from a topographic map.
 HV4387
 HV4387.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4387.GEOID18 height accuracy estimate available here.
 HV4387
 HV4387.Click photographs - Photos may exist for this station.
 HV4387
 HV4387.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4387
 HV4387. The following values were computed from the NAD 83(1993) position.
 HV4387
 HV4387;                    North         East     Units Scale Factor Converg.
 HV4387;SPC MD       -   141,536.139   394,274.856   MT  0.99995051   -0 02 29.2
 HV4387;SPC MD       -   464,356.48  1,293,550.09   sFT  0.99995051   -0 02 29.2
 HV4387;SPC VA N     - 2,142,499.871 3,624,311.262   MT  0.99996435   +0 53 41.9
 HV4387;SPC VA N     - 7,029,184.99 11,890,761.20   sFT  0.99996435   +0 53 41.9
 HV4387;UTM  18      - 4,312,336.302   320,943.084   MT  0.99999480   -1 17 56.1
 HV4387
 HV4387!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4387!SPC MD       -   0.99998826  x   0.99995051  =   0.99993877
 HV4387!SPC VA N     -   0.99998826  x   0.99996435  =   0.99995261
 HV4387!UTM  18      -   0.99998826  x   0.99999480  =   0.99998306
 HV4387
 HV4387:                Primary Azimuth Mark                     Grid Az
 HV4387:SPC MD       -  RENO STANDPIPE                           322 06 39.6
 HV4387:SPC VA N     -  RENO STANDPIPE                           321 10 28.5
 HV4387:UTM  18      -  RENO STANDPIPE                           323 22 06.5
 HV4387
 HV4387_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2094312336(NAD 83)
 HV4387
 HV4387|---------------------------------------------------------------------|
 HV4387| PID    Reference Object                     Distance      Geod. Az  |
 HV4387|                                                           dddmmss.s |
 HV4387| DC7583 STANDARDS 2 RM 2                      3.051 METERS 11841     |
 HV4387| HV4196 CATHEDRAL                           APPROX. 1.3 KM 1960558.1 |
 HV4387| HV4385 RENO STANDPIPE                      APPROX. 1.5 KM 3220410.4 |
 HV4387| DC7582 STANDARDS 2 RM 1                      1.055 METERS 35950     |
 HV4387|---------------------------------------------------------------------|
 HV4387
 HV4387                          SUPERSEDED SURVEY CONTROL
 HV4387
 HV4387  NAD 83(1991)-  38 56 30.11007(N)    077 03 57.74224(W) AD(       ) 1
 HV4387  NAD 83(1986)-  38 56 30.10966(N)    077 03 57.75239(W) AD(       ) 1
 HV4387  NAD 27      -  38 56 29.71100(N)    077 03 58.82800(W) AD(       ) 1
 HV4387
 HV4387.Superseded values are not recommended for survey control.
 HV4387
 HV4387.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4387.See file dsdata.pdf to determine how the superseded data were derived.
 HV4387
 HV4387_MARKER: DS = TRIANGULATION STATION DISK
 HV4387_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV4387
 HV4387  HISTORY     - Date     Condition        Report By
 HV4387  HISTORY     - 1934     MONUMENTED       CGS
 HV4387  HISTORY     - 1938     MARK NOT FOUND   CGS
 HV4387  HISTORY     - 1943     GOOD             CGS
 HV4387  HISTORY     - 1951     SEE DESCRIPTION  CGS
 HV4387  HISTORY     - 1960     GOOD             MADHOP
 HV4387
 HV4387                          STATION DESCRIPTION
 HV4387
 HV4387'DESCRIBED BY COAST AND GEODETIC SURVEY 1934 (JB)
 HV4387'THIS FIRST-ORDER STATION CONSISTS OF A STANDARD MARK SET IN
 HV4387'THE ROOF OF THE S BUILDING OF THE U.S. BUREAU OF STANDARDS
 HV4387'LOCATED ON CONNECTICUT AVENUE, NW, WASHINGTON, D.C.  THE
 HV4387'STATION IS ON THE NE CORNER OF THE ROOF AND CAN BE REACHED
 HV4387'BY A TRAP-DOOR ON THE S SIDE OF THE ROOF.
 HV4387'
 HV4387'STATION AND REFERENCE MARKS ARE STANDARD BRONZE DISKS SET IN
 HV4387'CONCRETE.
 HV4387'
 HV4387'REFERENCE MARK NO. 1 IS ON THE N PARAPET WALL, IS 3.46
 HV4387'FEET FROM THE STATION AND LIKEWISE 9.50 FEET FROM THE NE CORNER
 HV4387'OF THE BUILDING.
 HV4387'
 HV4387'REFERENCE MARK NO. 2 IS ON THE E PARAPET WALL, IS 10.01 FEET FROM
 HV4387'THE STATION AND 8.65 FEET FRM THE NE CORNER OF THE BUILDING.
 HV4387'
 HV4387'STATION AND REFERENCE MARKS ARE ALL DATED 1934.
 HV4387'
 HV4387'MARKS ARE NOT STAMPED 2 BUT SHOULD BE.
 HV4387'
 HV4387'AZIMUTH MARK IS THE FINIAL OF A TOWER TALLER AND SLIGHTLY TO
 HV4387'THE E OF STATION RENO.
 HV4387'
 HV4387'A 4-FOOT STAND WILL CLEAR ALL LINES.
 HV4387
 HV4387                          STATION RECOVERY (1938)
 HV4387
 HV4387'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4387'ROOF OF BUILDING NOT VISITED, BUT FROM THE GROUND THERE
 HV4387'APPEARS TO HAVE BEEN NO STRUCTURAL CHANGE WHICH WOULD CAUSE
 HV4387'LOSS OF MARKS.
 HV4387
 HV4387                          STATION RECOVERY (1943)
 HV4387
 HV4387'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1943 (FN)
 HV4387'THE ORIGINAL DESCRIPTION IS COMPLETE.
 HV4387'
 HV4387'DISTANCE TO REFERENCE MARKS WERE REMEASURED.
 HV4387
 HV4387                          STATION RECOVERY (1951)
 HV4387
 HV4387'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1951 (EJP)
 HV4387'STATION AND REFERENCE MARKS WERE RECOVERED IN LOCATIONS
 HV4387'DESCRIBED.  STATION MARK IS ACTUALLY A DISK (WITH THE SHANK
 HV4387'CUT OFF) SOLDERED TO THE TIN ROOFING.  EXPANSION AND CONTRACTION
 HV4387'OF THE TIN OVER THE CONCRETE ROOF MAY ACCOUNT FOR THE VARIATION
 HV4387'IN THE MEASUREMENTS TO THE REFERENCE MARKS.
 HV4387'
 HV4387'TO PRESERVE THE MARK DURING THE INSTALLATION OF A NEW TIN
 HV4387'ROOF, SEVERAL CONCRETE NAILS WERE DRIVEN TO FORM A CIRCLE
 HV4387'AROUND THE DISK.  THE OLD TIN WILL BE CUT AROUND THIS CIRCLE
 HV4387'LEAVING THE MARK IN PLACE.  A HOLE THE SIZE OF THE DISK WILL
 HV4387'BE CUT IN THE NEW TIN WHEN IT IS LAID.  IT WILL THEN BE
 HV4387'SOLDERED AROUND THE DISK.
 HV4387'
 HV4387'NEW MEASUREMENTS WERE MADE BETWEEN THE STATION AND REFERENCE
 HV4387'MARKS AS FOLLOWS--REFERENCE MARK 1 IS 1.050 M. (3.445 FT.),
 HV4387'REFERENCE MARK 2 IS 3.048 M. (9.999 FT.).
 HV4387
 HV4387                          STATION RECOVERY (1960)
 HV4387
 HV4387'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV4387'STATION AND REFERENCE MARKS RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7584 ***********************************************************************
 HV7584  DESIGNATION -  STANTON 2 1938
 HV7584  PID         -  HV7584
 HV7584  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7584  COUNTRY     -  US
 HV7584  USGS QUAD   -  ANACOSTIA (2016)
 HV7584
 HV7584                         *CURRENT SURVEY CONTROL
 HV7584  ______________________________________________________________________
 HV7584* NAD 83(1993) POSITION- 38 51 32.38876(N) 076 58 11.07451(W)   ADJUSTED
 HV7584* NAVD 88 ORTHO HEIGHT -    85.    (meters)      279.    (feet) SCALED
 HV7584  ______________________________________________________________________
 HV7584  GEOID HEIGHT    -        -32.245 (meters)                     GEOID18
 HV7584  LAPLACE CORR    -         -3.34  (seconds)                    DEFLEC18
 HV7584  HORZ ORDER      -  THIRD
 HV7584
 HV7584.The horizontal coordinates were established by classical geodetic methods
 HV7584.and adjusted by the National Geodetic Survey in November 1994.
 HV7584
 HV7584.The orthometric height was scaled from a topographic map.
 HV7584
 HV7584.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7584.GEOID18 height accuracy estimate available here.
 HV7584
 HV7584.Click photographs - Photos may exist for this station.
 HV7584
 HV7584.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7584
 HV7584. The following values were computed from the NAD 83(1993) position.
 HV7584
 HV7584;                    North         East     Units Scale Factor Converg.
 HV7584;SPC MD       -   132,354.078   402,626.125   MT  0.99994989   +0 01 08.4
 HV7584;SPC MD       -   434,231.67  1,320,949.21   sFT  0.99994989   +0 01 08.4
 HV7584;SPC VA N     - 2,133,455.397 3,632,811.538   MT  0.99995724   +0 57 18.2
 HV7584;SPC VA N     - 6,999,511.58 11,918,649.19   sFT  0.99995724   +0 57 18.2
 HV7584;UTM  18      - 4,302,973.098   329,091.256   MT  0.99995970   -1 14 10.1
 HV7584
 HV7584!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7584!SPC MD       -   0.99999176  x   0.99994989  =   0.99994165
 HV7584!SPC VA N     -   0.99999176  x   0.99995724  =   0.99994900
 HV7584!UTM  18      -   0.99999176  x   0.99995970  =   0.99995146
 HV7584
 HV7584:                Primary Azimuth Mark                     Grid Az
 HV7584:SPC MD       -  CAPITOL STATUE OF FREEDOM HEAD           315 04 00.9
 HV7584:SPC VA N     -  CAPITOL STATUE OF FREEDOM HEAD           314 07 51.1
 HV7584:UTM  18      -  CAPITOL STATUE OF FREEDOM HEAD           316 19 19.4
 HV7584
 HV7584_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2909102973(NAD 83)
 HV7584
 HV7584|---------------------------------------------------------------------|
 HV7584| PID    Reference Object                     Distance      Geod. Az  |
 HV7584|                                                           dddmmss.s |
 HV7584| HV4150 CAPITOL STATUE OF FREEDOM HEAD      APPROX. 4.8 KM 3150509.3 |
 HV7584|---------------------------------------------------------------------|
 HV7584
 HV7584                          SUPERSEDED SURVEY CONTROL
 HV7584
 HV7584  NAD 83(1991)-  38 51 32.38733(N)    076 58 11.07522(W) AD(       ) 3
 HV7584  NAD 83(1986)-  38 51 32.38664(N)    076 58 11.08659(W) AD(       ) 3
 HV7584  NAD 27      -  38 51 31.98500(N)    076 58 12.18200(W) AD(       ) 3
 HV7584
 HV7584.Superseded values are not recommended for survey control.
 HV7584
 HV7584.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7584.See file dsdata.pdf to determine how the superseded data were derived.
 HV7584
 HV7584_MARKER: 53 = ELEVATED TANK
 HV7584
 HV7584  HISTORY     - Date     Condition        Report By
 HV7584  HISTORY     - 1938     FIRST OBSERVED   WSSC
 HV7584  HISTORY     - 1943     GOOD             CGS
 HV7584  HISTORY     - 1958     GOOD             CGS
 HV7584  HISTORY     - 1971     GOOD             NGS
 HV7584
 HV7584                          STATION DESCRIPTION
 HV7584
 HV7584'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV7584'STATION IS THE CENTER OF ELEVATED STEEL WATER TANK, WITH
 HV7584'CONICAL ROOF, ON THE GROUNDS OF THE STANTON SCHOOL LOCATED AT
 HV7584'HAMILTON AND GOOD HOPE ROADS, S.E.
 HV7584
 HV7584                          STATION RECOVERY (1958)
 HV7584
 HV7584'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7584'THE STATION WAS RECOVERED IN GOOD CONDITION.  THE 1943
 HV7584'DESCRIPTION BY W.H.B. IS ADEQUATE AND COMPLETE.
 HV7584
 HV7584                          STATION RECOVERY (1971)
 HV7584
 HV7584'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV7584'THE STATION WAS RECOVERED AS DESCRIBED AND THE ORIGINAL DESCRIPTION
 HV7584'IS ADEQUATE.  AFTER CHECKING WITH THE WAASHINGTON SUBURBAN
 HV7584'SANITARY COMMISSION, THE POSITION OF THIS STATION IS TO BE THE
 HV7584'SAME AS WHEN ESTABLISHED IN 1938.
 HV7584'
 HV7584'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4431 ***********************************************************************
 HV4431  DESIGNATION -  START 1935
 HV4431  PID         -  HV4431
 HV4431  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4431  COUNTRY     -  US
 HV4431  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4431
 HV4431                         *CURRENT SURVEY CONTROL
 HV4431  ______________________________________________________________________
 HV4431* NAD 83(1993) POSITION- 38 52 35.16139(N) 077 02 49.53509(W)   ADJUSTED
 HV4431* NAVD 88 ORTHO HEIGHT -     3.    (meters)       10.    (feet) SCALED
 HV4431  ______________________________________________________________________
 HV4431  GEOID HEIGHT    -        -32.097 (meters)                     GEOID18
 HV4431  LAPLACE CORR    -         -2.78  (seconds)                    DEFLEC18
 HV4431  HORZ ORDER      -  THIRD
 HV4431
 HV4431.The horizontal coordinates were established by classical geodetic methods
 HV4431.and adjusted by the National Geodetic Survey in November 1994.
 HV4431
 HV4431.The orthometric height was scaled from a topographic map.
 HV4431
 HV4431.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4431.GEOID18 height accuracy estimate available here.
 HV4431
 HV4431.Click photographs - Photos may exist for this station.
 HV4431
 HV4431.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4431
 HV4431. The following values were computed from the NAD 83(1993) position.
 HV4431
 HV4431;                    North         East     Units Scale Factor Converg.
 HV4431;SPC MD       -   134,290.315   395,913.615   MT  0.99994985   -0 01 46.4
 HV4431;SPC MD       -   440,584.14  1,298,926.59   sFT  0.99994985   -0 01 46.4
 HV4431;SPC VA N     - 2,135,281.714 3,626,068.234   MT  0.99995857   +0 54 24.4
 HV4431;SPC VA N     - 7,005,503.42 11,896,525.53   sFT  0.99995857   +0 54 24.4
 HV4431;UTM  18      - 4,305,055.982   322,422.617   MT  0.99998831   -1 17 06.6
 HV4431
 HV4431!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4431!SPC MD       -   1.00000460  x   0.99994985  =   0.99995445
 HV4431!SPC VA N     -   1.00000460  x   0.99995857  =   0.99996317
 HV4431!UTM  18      -   1.00000460  x   0.99998831  =   0.99999291
 HV4431
 HV4431:                Primary Azimuth Mark                     Grid Az
 HV4431:SPC MD       -  TIDAL USE                                040 10 11.5
 HV4431:SPC VA N     -  TIDAL USE                                039 14 00.7
 HV4431:UTM  18      -  TIDAL USE                                041 25 31.7
 HV4431
 HV4431_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2242205055(NAD 83)
 HV4431
 HV4431|---------------------------------------------------------------------|
 HV4431| PID    Reference Object                     Distance      Geod. Az  |
 HV4431|                                                           dddmmss.s |
 HV4431| HV4436 TIDAL USE                           APPROX. 0.6 KM 0400825.1 |
 HV4431| HV4301 HEURICHS BREWERY FINIAL             APPROX. 2.1 KM 3440843.9 |
 HV4431|---------------------------------------------------------------------|
 HV4431
 HV4431                          SUPERSEDED SURVEY CONTROL
 HV4431
 HV4431  NAD 83(1991)-  38 52 35.16009(N)    077 02 49.53657(W) AD(       ) 3
 HV4431  NAD 83(1986)-  38 52 35.15993(N)    077 02 49.54727(W) AD(       ) 3
 HV4431  NAD 27      -  38 52 34.75000(N)    077 02 50.63600(W) AD(       ) 3
 HV4431
 HV4431.Superseded values are not recommended for survey control.
 HV4431
 HV4431.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4431.See file dsdata.pdf to determine how the superseded data were derived.
 HV4431
 HV4431_MARKER: DE = TRAVERSE STATION DISK
 HV4431_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV4431_STAMPING: START 1935
 HV4431_MARK LOGO: CGS
 HV4431_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV4431+STABILITY: SURFACE MOTION
 HV4431
 HV4431  HISTORY     - Date     Condition        Report By
 HV4431  HISTORY     - 1935     MONUMENTED       CGS
 HV4431  HISTORY     - 1939     GOOD             CGS
 HV4431  HISTORY     - 1948     MARK NOT FOUND   CGS
 HV4431  HISTORY     - 20120511 MARK NOT FOUND   NGS
 HV4431
 HV4431                          STATION DESCRIPTION
 HV4431
 HV4431'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (LOC)
 HV4431'THIS TRAVERSE STATION IS A STANDARD BRONZE DISK STAMPED START 1935
 HV4431'SET IN THE TOP OF A CONCRETE MONUMENT, 8 INCHES IN DIAMETER AT
 HV4431'THE TOP, 12 INCHES SQUARE AT THE BOTTOM, AND 36 INCHES DEEP WITH
 HV4431'THE MARK 1 INCH BELOW THE GROUND LEVEL, IN THE LAWN 75.9 FEET NE
 HV4431'OF THE CENTER OF THE NORTHERN END OF THE POLISHED GRANITE BASE OF
 HV4431'THE MEMORIAL MONUMENT TO SEAFARING MEN OF THE U.S. AT THE SE
 HV4431'END OF COLUMBIA ISLAND, 74.0 FEET NE OF THE CENTER OF THE
 HV4431'SOUTHERN END OF THE POLISHED GRANITE BASE OF THE MEMORIAL,
 HV4431'20.0 FEET SW OF THE CENTER LINE OF THE CINDER BRIDLE PATH, 27.6
 HV4431'FEET W OF A SMALL APPLE TREE, AND 41.0 FEET SW OF THE EDGE OF
 HV4431'THE BANK WHERE IT DROPS SHARPLY OFF TO THE POTOMAC RIVER.
 HV4431'FROM THE NORTHERN END OF THE POLISHED GRANITE BASE OF THE
 HV4431'MEMORIAL THE MARK IS IN LINE WITH THE CENTER LINE OF THE INLET
 HV4431'GATE BRIDGE OF THE TIDAL BASIN.  MARK IS ABOUT 7 FEET BELOW THE
 HV4431'LEVEL OF THE LOWEST PART OF THE POLISHED GRANITE BASE OF THE
 HV4431'MEMORIAL.  THIS MARK AND GATE MAKE THE LINE GATE - START,
 HV4431'WHICH IS THE START LINE OF THE SPEEDBOAT RACE COURSE AND IS 90
 HV4431'DEG TO THE AXIS OF THE RACE COURSE.
 HV4431'
 HV4431'NOTE--DISTANCES MEASURED ON THE GROUND OR SLOPE AS THE CASE MAY BE.
 HV4431
 HV4431                          STATION RECOVERY (1939)
 HV4431
 HV4431'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4431'DESCRIBED AND MARKED AS A TRAVERSE STATION.  RECOVERED IN GOOD
 HV4431'CONDITION.  THE DESCRIPTION IS ADEQUATE.
 HV4431
 HV4431                          STATION RECOVERY (1948)
 HV4431
 HV4431'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1948 (RJS)
 HV4431'STATION NOT RECOVERED.  THIS STATION PLOTTED UNDER AN ASPHALT
 HV4431'SIDEWALK.  THE AREA ADJACENT TO THE SIDEWALK WAS PROBED, BUT NO
 HV4431'DIGGING WAS ATTEMPTED.
 HV4431
 HV4431                          STATION RECOVERY (2012)
 HV4431
 HV4431'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (JRO)
 HV4431'NOT RECOVERED, POSSIBLY LOST OR BURIED KIND OF DEEP.  THE POSITION OF
 HV4431'THIS MARK WAS RE-ESTABLISHED BY OPUS-RS OBSERVATION.  AS NOTED IN THE
 HV4431'1948 RECOVERY NOTE, IT DOES INDEED FALL UNDER AN ASPHALT SIDEWALK,
 HV4431'ABOUT UNDER THE CENTERLINE OF THE SIDEWALK THAT CIRCLES THE MARINERS
 HV4431'MEMORIAL.  PROBING FROM THE SIDE IS NOT FEASIBLE.
 HV4431'
 HV4431'THE AREA WAS SEARCHED BY AN ALL-METAL DETECTOR.  THERE WAS NO REACTION
 HV4431'FROM IT TO INDICATE THAT THE DISK STILL EXISTS.  IF THE SIDEWALK IS
 HV4431'EVER RE-DONE THE MARK COULD BE SEARCHED FOR THEN IN COOPERATION WITH
 HV4431'THE PARK SERVICE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4709 ***********************************************************************
 HV4709  DESIGNATION -  STEEL 610
 HV4709  PID         -  HV4709
 HV4709  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4709  COUNTRY     -  US
 HV4709  USGS QUAD   -  ALEXANDRIA (2019)
 HV4709
 HV4709                         *CURRENT SURVEY CONTROL
 HV4709  ______________________________________________________________________
 HV4709* NAD 83(1993) POSITION- 38 50 53.78460(N) 077 01 13.01647(W)   ADJUSTED
 HV4709* NAVD 88 ORTHO HEIGHT -    -0.    (meters)       -0.    (feet) SCALED
 HV4709  ______________________________________________________________________
 HV4709  GEOID HEIGHT    -        -32.184 (meters)                     GEOID18
 HV4709  LAPLACE CORR    -         -2.73  (seconds)                    DEFLEC18
 HV4709  HORZ ORDER      -  SECOND
 HV4709
 HV4709.The horizontal coordinates were established by classical geodetic methods
 HV4709.and adjusted by the National Geodetic Survey in November 1994.
 HV4709
 HV4709.The orthometric height was scaled from a topographic map.
 HV4709
 HV4709.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4709.GEOID18 height accuracy estimate available here.
 HV4709
 HV4709.Click photographs - Photos may exist for this station.
 HV4709
 HV4709.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4709
 HV4709. The following values were computed from the NAD 83(1993) position.
 HV4709
 HV4709;                    North         East     Units Scale Factor Converg.
 HV4709;SPC MD       -   131,163.467   398,239.355   MT  0.99994996   -0 00 45.8
 HV4709;SPC MD       -   430,325.47  1,306,556.95   sFT  0.99994996   -0 00 45.8
 HV4709;SPC VA N     - 2,132,193.264 3,628,444.776   MT  0.99995647   +0 55 24.7
 HV4709;SPC VA N     - 6,995,370.73 11,904,322.57   sFT  0.99995647   +0 55 24.7
 HV4709;UTM  18      - 4,301,878.830   324,679.377   MT  0.99997851   -1 16 03.2
 HV4709
 HV4709!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4709!SPC MD       -   1.00000509  x   0.99994996  =   0.99995505
 HV4709!SPC VA N     -   1.00000509  x   0.99995647  =   0.99996156
 HV4709!UTM  18      -   1.00000509  x   0.99997851  =   0.99998360
 HV4709
 HV4709:                Primary Azimuth Mark                     Grid Az
 HV4709:SPC MD       -  NEAR                                     261 28 35.3
 HV4709:SPC VA N     -  NEAR                                     260 32 24.8
 HV4709:UTM  18      -  NEAR                                     262 43 52.7
 HV4709
 HV4709_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2467901878(NAD 83)
 HV4709
 HV4709|---------------------------------------------------------------------|
 HV4709| PID    Reference Object                     Distance      Geod. Az  |
 HV4709|                                                           dddmmss.s |
 HV4709| DC7588 STEEL 610 RM 2                        9.716 METERS 03546     |
 HV4709| DC7587 STEEL 610 RM 1                       22.950 METERS 20025     |
 HV4709| HV7905 NEAR                                APPROX. 1.7 KM 2612749.5 |
 HV4709|---------------------------------------------------------------------|
 HV4709
 HV4709                          SUPERSEDED SURVEY CONTROL
 HV4709
 HV4709  NAD 83(1991)-  38 50 53.78309(N)    077 01 13.01780(W) AD(       ) 2
 HV4709  NAD 83(1986)-  38 50 53.78286(N)    077 01 13.02896(W) AD(       ) 2
 HV4709  NAD 27      -  38 50 53.38000(N)    077 01 14.10900(W) AD(       ) 2
 HV4709
 HV4709.Superseded values are not recommended for survey control.
 HV4709
 HV4709.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4709.See file dsdata.pdf to determine how the superseded data were derived.
 HV4709
 HV4709_MARKER: Z = SEE DESCRIPTION
 HV4709_SETTING: 0 = UNSPECIFIED SETTING
 HV4709
 HV4709  HISTORY     - Date     Condition        Report By
 HV4709  HISTORY     - 1935     MONUMENTED       USACE
 HV4709  HISTORY     - 1938     MARK NOT FOUND   CGS
 HV4709  HISTORY     - 1953     MARK NOT FOUND   CGS
 HV4709
 HV4709                          STATION DESCRIPTION
 HV4709
 HV4709'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1935 (JHB)
 HV4709'THIS STATION IS ONE ESTABLISHED BY THE U.S. ARMY ENGINEERS ON
 HV4709'THE E BANK OF THE POTOMAC RIVER AND ON THE S SIDE OF THE ANACOSTIA
 HV4709'RIVER, ON A ROUNDING POINT AT THE EDGE OF BOLLING FIELD.  THE
 HV4709'STATION IS AT THE FOOT OF A BLUFF WHICH IS ABOUT 15 FEET HIGH
 HV4709'AT THIS POINT, ABOUT 25 YARDS N OF A SMALL DRAW, ABOUT 100 YARDS
 HV4709'S OF THE S END OF A STONE SEA WALL, AND ABOUT 4 FEET INSHORE FROM
 HV4709'HIGH-WATER LINE.  STATION IS ON THE RESTRICTED AREA OF THE
 HV4709'U.S.  ARMY.  PERMISSION SHOULD BE OBTAINED AT THE FIELD TO GO
 HV4709'TO THE STATION.
 HV4709'
 HV4709'REFERENCE MARKS ARE STANDARD BRONZE DISKS SET IN CONCRETE.
 HV4709'
 HV4709'THE STATION MARK IS A U.S.E.D. TABLET SET IN A CONCRETE POST
 HV4709'AND STAMPED, 610.
 HV4709'
 HV4709'TWO REFERENCE MARKS WERE ESTABLISHED.  NO. 1 S OF THE STATION AND
 HV4709'CLOSE TO THE FOOT OF THE BLUFF, AND NO. 2 N OF THE STATION AND
 HV4709'CLOSE TO THE FOOT OF THE BLUFF.
 HV4709'
 HV4709'TO REACH STATION FROM ANACOSTIA, GO S ON NICHOLS AVENUE FROM
 HV4709'JUNCTION WITH STATE HIGHWAY 5 FOR 1.7 MILES (SIGN HERE BOLLING
 HV4709'FIELD), TURN RIGHT AND GO STRAIGHT AHEAD THROUGH GATE INTO
 HV4709'FIELD, CONTINUE ABOUT 300 YARDS AND TURN RIGHT ON ROAD AND
 HV4709'PROCEED TO A POINT JUST S OF A PROMINENT LONE TREE.  LEAVE TRUCK
 HV4709'HERE AND GO DOWN ON BEACH.  STATION IS ABOUT 100 YARDS S ALONG
 HV4709'BEACH.
 HV4709'
 HV4709'HEIGHT OF LIGHT ABOVE STATION MARK - 2 METERS.
 HV4709
 HV4709                          STATION RECOVERY (1938)
 HV4709
 HV4709'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4709'STATION AND REFERENCE MARKS LOST.  ONE HOUR SPENT IN SEARCH.
 HV4709'U.S.E SURVEYORS HAVE PREVIOUSLY SEARCHED FOR THIS MARK AND BEEN
 HV4709'UNABLE TO FIND IT.
 HV4709
 HV4709                          STATION RECOVERY (1953)
 HV4709
 HV4709'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1953 (JHB)
 HV4709'A THOROUGH SEARCH WAS MADE FOR THIS STATION BY 3 MEN BUT IT WAS
 HV4709'NOT RECOVERED.  THE AREA IN WHICH IT IS LOCATED IS SUBJECT TO
 HV4709'FLOODING AND THE STATION MAY BE LOST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9834 ***********************************************************************
 HV9834  DESIGNATION -  STEINKOLK GPS E14H
 HV9834  PID         -  HV9834
 HV9834  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9834  COUNTRY     -  US
 HV9834  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9834
 HV9834                         *CURRENT SURVEY CONTROL
 HV9834  ______________________________________________________________________
 HV9834* NAD 83(2011) POSITION- 38 56 27.09050(N) 077 01 15.37611(W)   ADJUSTED
 HV9834* NAD 83(2011) ELLIP HT-    35.702 (meters)        (06/27/12)   ADJUSTED
 HV9834* NAD 83(2011) EPOCH   -  2010.00
 HV9834* NAVD 88 ORTHO HEIGHT -    67.7   (meters)      222.    (feet) VERTCON3
 HV9834  ______________________________________________________________________
 HV9834  GEOID HEIGHT    -        -32.019 (meters)                     GEOID18
 HV9834  NAD 83(2011) X  -  1,115,672.003 (meters)                     COMP
 HV9834  NAD 83(2011) Y  - -4,840,576.060 (meters)                     COMP
 HV9834  NAD 83(2011) Z  -  3,987,234.907 (meters)                     COMP
 HV9834  LAPLACE CORR    -         -2.16  (seconds)                    DEFLEC18
 HV9834
 HV9834  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV9834  Standards:
 HV9834         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV9834            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV9834  -------------------------------------------------------------------
 HV9834  NETWORK    1.00   1.82           0.44   0.37   0.93      0.06897313
 HV9834  -------------------------------------------------------------------
 HV9834  Click here for local accuracies and other accuracy information.
 HV9834
 HV9834.The horizontal coordinates were established by GPS observations
 HV9834.and adjusted by the National Geodetic Survey in June 2012.
 HV9834
 HV9834.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV9834.been affixed to the stable North American tectonic plate. See 
 HV9834.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV9834
 HV9834.The horizontal coordinates are valid at the epoch date displayed above
 HV9834.which is a decimal equivalence of Year/Month/Day.
 HV9834
 HV9834.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV9834.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV9834
 HV9834.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9834.GEOID18 height accuracy estimate available here.
 HV9834
 HV9834.Click photographs - Photos may exist for this station.
 HV9834
 HV9834.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV9834
 HV9834.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9834
 HV9834.The ellipsoidal height was determined by GPS observations
 HV9834.and is referenced to NAD 83.
 HV9834
 HV9834. The following values were computed from the NAD 83(2011) position.
 HV9834
 HV9834;                    North         East     Units Scale Factor Converg.
 HV9834;SPC MD       -   141,441.144   398,184.814   MT  0.99995049   -0 00 47.3
 HV9834;SPC MD       -   464,044.82  1,306,378.01   sFT  0.99995049   -0 00 47.3
 HV9834;SPC VA N     - 2,142,468.783 3,628,222.304   MT  0.99996427   +0 55 23.2
 HV9834;SPC VA N     - 7,029,083.00 11,903,592.68   sFT  0.99996427   +0 55 23.2
 HV9834;UTM  18      - 4,312,155.523   324,850.156   MT  0.99997776   -1 16 13.9
 HV9834
 HV9834!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9834!SPC MD       -   0.99999440  x   0.99995049  =   0.99994489
 HV9834!SPC VA N     -   0.99999440  x   0.99996427  =   0.99995867
 HV9834!UTM  18      -   0.99999440  x   0.99997776  =   0.99997216
 HV9834
 HV9834_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2485012155(NAD 83)
 HV9834
 HV9834|---------------------------------------------------------------------|
 HV9834| PID    Reference Object                     Distance      Geod. Az  |
 HV9834|                                                           dddmmss.s |
 HV9834| HV9830 DICKSON GPS E 14I                   343.165 METERS 02933     |
 HV9834|---------------------------------------------------------------------|
 HV9834
 HV9834                          SUPERSEDED SURVEY CONTROL
 HV9834
 HV9834  NAD 83(2007)-  38 56 27.09112(N)    077 01 15.37692(W) AD(2002.00) 0
 HV9834  ELLIP H (02/10/07)   35.714  (m)                       GP(2002.00)    
 HV9834  ELLIP H (08/30/02)   35.709  (m)                       GP(       ) 4 2
 HV9834  NAD 83(1993)-  38 56 27.09160(N)    077 01 15.37666(W) AD(       ) 1
 HV9834  ELLIP H (11/14/94)   35.702  (m)                       GP(       ) 4 2
 HV9834  NAD 83(1991)-  38 56 27.09103(N)    077 01 15.37664(W) AD(       ) 1
 HV9834  NGVD 29 (11/30/93)   68.0    (m)  GEOID93  model used  GPS OBS        
 HV9834
 HV9834.Superseded values are not recommended for survey control.
 HV9834
 HV9834.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9834.See file dsdata.pdf to determine how the superseded data were derived.
 HV9834
 HV9834_MARKER: DD = SURVEY DISK
 HV9834_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV9834_SP_SET: FLUSH IN SIDEWALK
 HV9834_STAMPING: STEINKOLK GPS E14H 9-92
 HV9834_MARK LOGO: DEWDAV
 HV9834_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9834_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9834_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV9834+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9834
 HV9834  HISTORY     - Date     Condition        Report By
 HV9834  HISTORY     - 1992     MONUMENTED       DEWDAV
 HV9834
 HV9834                          STATION DESCRIPTION
 HV9834
 HV9834'DESCRIBED BY DEWBERRY DAVIS 1992
 HV9834'STATION IS LOCATED IN DOWNTOWN WASHINGTON, DISTRICT OF COLUMBIA.
 HV9834'TO REACH STATION PROCEED TO INTERSECTION OF NEW HAMPSHIRE AVENUE
 HV9834'NORTHWEST AND TAYLOR STREET NORTHWEST. STATION IS 2.5 INCH STANDARD
 HV9834'BRASS METRO SURVEY DISK SET FLUSH IN SIDEWALK IN CONCRETE TRAFFIC
 HV9834'ISLAND CENTER OF NEW HAMPSHIRE AVE. SOUTH OF CENTERLINE INTERSECTION.
 HV9834'STATION IS 421.097 FT (128.351 M) NORTHWEST OF REFERENCE DISK D,
 HV9834'425.277 FT (129.625 M) EAST OF REFERENCE DISK B, 193.807 FT
 HV9834'(59.072 M) WEST OF REFERENCE DISK A, 202.972 FT (61.866 M)
 HV9834'SOUTH-SOUTHEAST OF REFERENCE DISK C, NORTH 27-15-22 EAST 833.081 FT
 HV9834'(253.924 M) FROM METRO CONTROL POINT E-14G, BEARING SOUTH 29-31-07
 HV9834'WEST 1012.239 FT (308.531 M) FROM METRO CONTROL POINT E-14I, SOUTH
 HV9834'29-33-33 WEST 1125.877 FT (343.168 M) FROM METRO CONTROL STATION
 HV9834'DICKSON GPS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4446 ***********************************************************************
 HV4446  DESIGNATION -  STEVENS
 HV4446  PID         -  HV4446
 HV4446  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4446  COUNTRY     -  US
 HV4446  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4446
 HV4446                         *CURRENT SURVEY CONTROL
 HV4446  ______________________________________________________________________
 HV4446* NAD 83(1993) POSITION- 38 57 40.72123(N) 077 01 29.27734(W)   ADJUSTED
 HV4446  ______________________________________________________________________
 HV4446  GEOID HEIGHT    -        -31.998 (meters)                     GEOID18
 HV4446  LAPLACE CORR    -         -2.36  (seconds)                    DEFLEC18
 HV4446  HORZ ORDER      -  THIRD
 HV4446
 HV4446.The horizontal coordinates were established by classical geodetic methods
 HV4446.and adjusted by the National Geodetic Survey in November 1994.
 HV4446
 HV4446.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4446.GEOID18 height accuracy estimate available here.
 HV4446
 HV4446.Click photographs - Photos may exist for this station.
 HV4446
 HV4446.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4446
 HV4446. The following values were computed from the NAD 83(1993) position.
 HV4446
 HV4446;                    North         East     Units Scale Factor Converg.
 HV4446;SPC MD       -   143,711.695   397,850.665   MT  0.99995096   -0 00 56.0
 HV4446;SPC MD       -   471,494.12  1,305,281.72   sFT  0.99995096   -0 00 56.0
 HV4446;SPC VA N     - 2,144,733.603 3,627,851.094   MT  0.99996635   +0 55 14.5
 HV4446;SPC VA N     - 7,036,513.50 11,902,374.80   sFT  0.99996635   +0 55 14.5
 HV4446;UTM  18      - 4,314,432.923   324,565.915   MT  0.99997899   -1 16 24.6
 HV4446
 HV4446_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2456514432(NAD 83)
 HV4446
 HV4446                          SUPERSEDED SURVEY CONTROL
 HV4446
 HV4446  NAD 83(1991)-  38 57 40.72056(N)    077 01 29.27823(W) AD(       ) 3
 HV4446  NAD 83(1986)-  38 57 40.71981(N)    077 01 29.28843(W) AD(       ) 3
 HV4446  NAD 27      -  38 57 40.32700(N)    077 01 30.37300(W) AD(       ) 3
 HV4446
 HV4446.Superseded values are not recommended for survey control.
 HV4446
 HV4446.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4446.See file dsdata.pdf to determine how the superseded data were derived.
 HV4446
 HV4446_MARKER: 86 = CUPOLA
 HV4446
 HV4446  HISTORY     - Date     Condition        Report By
 HV4446  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4446  HISTORY     - 1971     GOOD             NGS
 HV4446
 HV4446                          STATION DESCRIPTION
 HV4446
 HV4446'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4446'STATION IS THE FINIAL ON THE DOUBLE CUPOLA OF THE PAUL JUNIOR
 HV4446'HIGH SCHOOL LOCATED ON THE W SIDE OF EIGHTH STREET AT OGLETHORPE
 HV4446'STREET, N.W.
 HV4446'
 HV4446'THE UPPER AND SMALL SECTION OF THE CUPOLA HAS LOUVRES IN THE
 HV4446'SIDE, WITH LOW WOODEN RAILING ABOUT ITS BASE.  THE BOTTOM
 HV4446'SECTION HAS GLASS WINDOWS WITH IRON WORK RAILING ABOUT ITS
 HV4446'BASE.
 HV4446
 HV4446                          STATION RECOVERY (1971)
 HV4446
 HV4446'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4446'THE STATION WAS RECOVERED AS DESCRIBED IT HAS AN OVERALL
 HV4446'HEIGHT OF APPROXIMATELY 110 FEET.
 HV4446'
 HV4446'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DIST. OF
 HV4446'COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1844 ***********************************************************************
 HV1844  DESIGNATION -  SURVEY LODGE
 HV1844  PID         -  HV1844
 HV1844  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1844  COUNTRY     -  US
 HV1844  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1844
 HV1844                         *CURRENT SURVEY CONTROL
 HV1844  ______________________________________________________________________
 HV1844* NAD 83(1986) POSITION- 38 53 17.19   (N) 077 02 14.33   (W)   HD_HELD1
 HV1844* NAVD 88 ORTHO HEIGHT -     4.837 (meters)       15.87  (feet) ADJUSTED
 HV1844  ______________________________________________________________________
 HV1844  GEOID HEIGHT    -        -32.089 (meters)                     GEOID18
 HV1844  DYNAMIC HEIGHT  -          4.834 (meters)       15.86  (feet) COMP
 HV1844  MODELED GRAVITY -    980,097.4   (mgal)                       NAVD 88
 HV1844
 HV1844  VERT ORDER      -  FIRST     CLASS II
 HV1844
 HV1844.The horizontal coordinates were determined by differentially corrected
 HV1844.hand held GPS observations or other comparable positioning techniques
 HV1844.and have an estimated accuracy of +/- 3 meters.
 HV1844
 HV1844.The orthometric height was determined by differential leveling and
 HV1844.adjusted by the NATIONAL GEODETIC SURVEY
 HV1844.in October 2012.
 HV1844
 HV1844.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1844.GEOID18 height accuracy estimate available here.
 HV1844
 HV1844.Click photographs - Photos may exist for this station.
 HV1844
 HV1844.The dynamic height is computed by dividing the NAVD 88
 HV1844.geopotential number by the normal gravity value computed on the
 HV1844.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1844.degrees latitude (g = 980.6199 gals.).
 HV1844
 HV1844.The modeled gravity was interpolated from observed gravity values.
 HV1844
 HV1844
 HV1844_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2329906332(NAD 83)
 HV1844
 HV1844                          SUPERSEDED SURVEY CONTROL
 HV1844
 HV1844  NAVD 88 (04/20/10)    4.838  (m)           15.87   (f) SUPERSEDED  1 2
 HV1844  NAVD 88 (05/07/99)    4.838  (m)           15.87   (f) SUPERSEDED  1 2
 HV1844  NAVD 88 (02/03/93)    4.837  (m)           15.87   (f) SUPERSEDED  1 2
 HV1844  NAVD 88 (??/??/92)    4.834  (m)           15.86   (f) SUPERSEDED  1 2
 HV1844  NGVD 29 (08/12/92)    5.069  (m)           16.63   (f) ADJUSTED    1 2
 HV1844  NGVD 29 (??/??/87)    5.073  (m)           16.64   (f) SUPERSEDED  1 2
 HV1844
 HV1844.Superseded values are not recommended for survey control.
 HV1844
 HV1844.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1844.See file dsdata.pdf to determine how the superseded data were derived.
 HV1844
 HV1844_MARKER: X = CHISELED CROSS
 HV1844_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1844_SP_SET: DOORSILL
 HV1844_MARK LOGO: NONE
 HV1844_PROJECTION: FLUSH
 HV1844_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1844_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1844_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1844+SATELLITE: SATELLITE OBSERVATIONS - November 04, 2020
 HV1844
 HV1844  HISTORY     - Date     Condition        Report By
 HV1844  HISTORY     - UNK      MONUMENTED       PBPP
 HV1844  HISTORY     - 1941     GOOD             CGS
 HV1844  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV1844  HISTORY     - 19920513 GOOD             NGS
 HV1844  HISTORY     - 19980928 GOOD             NGS
 HV1844  HISTORY     - 20040226 GOOD             FHWA
 HV1844  HISTORY     - 20050718 GOOD             USPSQD
 HV1844  HISTORY     - 20081223 GOOD             NGS
 HV1844  HISTORY     - 20090319 GOOD             GEOCAC
 HV1844  HISTORY     - 20100321 GOOD             GEOCAC
 HV1844  HISTORY     - 20120222 GOOD             NGS
 HV1844  HISTORY     - 20120301 GOOD             NGS
 HV1844  HISTORY     - 20180718 POOR             USPSQD
 HV1844  HISTORY     - 20201104 GOOD             NGS
 HV1844
 HV1844                          STATION DESCRIPTION
 HV1844
 HV1844'DESCRIBED BY COAST AND GEODETIC SURVEY 1941
 HV1844'AT WASHINGTON.
 HV1844'AT WASHINGTON, BETWEEN THE WASHINGTON MONUMENT AND THE TIDAL
 HV1844'BASIN, AT A BUILDING KNOWN AS THE SURVEY LODGE AND USED AS AN
 HV1844'OFFICE BY THE SURVEY DIVISION OF THE NATIONAL PARK SERVICE, ON
 HV1844'THE SOUTH SIDE OF THE BUILDING, 5 FEET WEST OF THE SOUTHEAST
 HV1844'CORNER, ON THE STONE DOORSILL, 1.5 INCHES NORTH OF THE SOUTH
 HV1844'SIDE OF THE SILL, AND 2.5 INCHES WEST OF THE DOOR JAMB.  A
 HV1844'CHISELED CROSS.
 HV1844
 HV1844                          STATION RECOVERY (1971)
 HV1844
 HV1844'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971
 HV1844'MARK NOT FOUND.
 HV1844
 HV1844                          STATION RECOVERY (1992)
 HV1844
 HV1844'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1844'1.2 KM (0.75 MI) EASTERLY ALONG INDEPENDENCE AVENUE FROM THE LINCOLN
 HV1844'MEMORIAL IN WASHINGTON, D.C., A CHISELED CROSS IN THE NORTHWEST END
 HV1844'OF THE STONE DOOR SILL OF THE MOST NORTHEASTERLY DOOR ON THE
 HV1844'SOUTHEAST SIDE OF A STONE BUILDING USED AS AN INFORMATION OFFICE BY
 HV1844'THE NATIONAL PARK SERVICE, 36.0 M (118.1 FT) NORTH OF THE NORTH CURB
 HV1844'OF THE EASTBOUND LANES OF THE AVENUE, 1.5 M (4.9 FT) SOUTHWEST OF THE
 HV1844'NORTHEAST CORNER OF THE BUILDING, AND 0.2 M (0.7 FT) ABOVE THE GROUND
 HV1844'SURFACE.
 HV1844
 HV1844                          STATION RECOVERY (1998)
 HV1844
 HV1844'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1998 (RLA)
 HV1844'RECOVERED AS DESCRIBED.
 HV1844
 HV1844                          STATION RECOVERY (2004)
 HV1844
 HV1844'RECOVERY NOTE BY FEDERAL HIGHWAY ADMINISTRATION 2004 (JDW)
 HV1844'RECOVERED IN GOOD CONDITION.
 HV1844
 HV1844                          STATION RECOVERY (2005)
 HV1844
 HV1844'RECOVERY NOTE BY US POWER SQUADRON 2005 (FM)
 HV1844'RECOVERED IN GOOD CONDITION.
 HV1844
 HV1844                          STATION RECOVERY (2008)
 HV1844
 HV1844'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV1844'RECOVERED AS DESCRIBED.
 HV1844
 HV1844                          STATION RECOVERY (2009)
 HV1844
 HV1844'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV1844'RECOVERED IN GOOD CONDITION.
 HV1844
 HV1844                          STATION RECOVERY (2010)
 HV1844
 HV1844'RECOVERY NOTE BY GEOCACHING 2010 (MFM)
 HV1844'RECOVERED IN GOOD CONDITION. STATION IN ON THE DOOR SILL TO THE UNUSED
 HV1844'DOOR IN THE SURVEY LODGE.
 HV1844
 HV1844                          STATION RECOVERY (2012)
 HV1844
 HV1844'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1844'RECOVERED IN GOOD CONDITION.
 HV1844
 HV1844                          STATION RECOVERY (2012)
 HV1844
 HV1844'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1844'RECOVERED AS DESCRIBED.
 HV1844
 HV1844                          STATION RECOVERY (2018)
 HV1844
 HV1844'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV1844'CROSS IS GETTING VERY HARD TO SEE.
 HV1844
 HV1844                          STATION RECOVERY (2020)
 HV1844
 HV1844'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JKH)
 HV1844'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8032 ***********************************************************************
 HV8032  DESIGNATION -  SW 11
 HV8032  PID         -  HV8032
 HV8032  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8032  COUNTRY     -  US
 HV8032  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8032
 HV8032                         *CURRENT SURVEY CONTROL
 HV8032  ______________________________________________________________________
 HV8032* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV8032* NAVD 88 ORTHO HEIGHT -    19.640 (meters)       64.44  (feet) ADJUSTED
 HV8032  ______________________________________________________________________
 HV8032  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV8032  DYNAMIC HEIGHT  -         19.630 (meters)       64.40  (feet) COMP
 HV8032  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV8032
 HV8032  VERT ORDER      -  FIRST     CLASS 0
 HV8032
 HV8032.The horizontal coordinates were scaled from a map and have
 HV8032.an estimated accuracy of +/- 6 seconds.
 HV8032
 HV8032.The orthometric height was determined by differential leveling and
 HV8032.adjusted by the NATIONAL GEODETIC SURVEY
 HV8032.in June 1991.
 HV8032
 HV8032.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8032.GEOID18 height accuracy estimate available here.
 HV8032
 HV8032.Click photographs - Photos may exist for this station.
 HV8032
 HV8032.The dynamic height is computed by dividing the NAVD 88
 HV8032.geopotential number by the normal gravity value computed on the
 HV8032.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8032.degrees latitude (g = 980.6199 gals.).
 HV8032
 HV8032.The modeled gravity was interpolated from observed gravity values.
 HV8032
 HV8032
 HV8032_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV8032
 HV8032                          SUPERSEDED SURVEY CONTROL
 HV8032
 HV8032  NGVD 29 (08/12/92)   19.871  (m)           65.19   (f) ADJUSTED    1 0
 HV8032
 HV8032.Superseded values are not recommended for survey control.
 HV8032
 HV8032.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8032.See file dsdata.pdf to determine how the superseded data were derived.
 HV8032
 HV8032_MARKER: Z = SEE DESCRIPTION
 HV8032_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV8032_SP_SET: BUILDING
 HV8032_MARK LOGO: NONE
 HV8032_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV8032_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV8032
 HV8032  HISTORY     - Date     Condition        Report By
 HV8032  HISTORY     - 1949     MONUMENTED       CGS
 HV8032  HISTORY     - 1978     GOOD             NGS
 HV8032  HISTORY     - 1978     GOOD             NGS
 HV8032  HISTORY     - 1982     GOOD             NGS
 HV8032  HISTORY     - 19920615 GOOD             NGS
 HV8032
 HV8032                          STATION DESCRIPTION
 HV8032
 HV8032'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV8032'IN WASHINGTON DC.
 HV8032'THE MARK IS 12 FT ABOVE BLACKTOP AREA.
 HV8032'AT THE WHITE HOUSE, SET IN THE NORTH WALL OF THE EAST WING, 21.5 FEET
 HV8032'EAST OF THE EAST WALL OF THE WHITE HOUSE.  WHITE HOUSE WALL MARK.
 HV8032
 HV8032                          STATION RECOVERY (1978)
 HV8032
 HV8032'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV8032'THE MARK IS 12 FT ABOVE BLACKTOP AREA.
 HV8032'AT THE WHITE HOUSE, SET IN THE NORTH WALL OF THE EAST WING, 21.5 FEET
 HV8032'EAST OF THE EAST WALL OF THE WHITE HOUSE.  WHITE HOUSE WALL MARK.
 HV8032
 HV8032                          STATION RECOVERY (1982)
 HV8032
 HV8032'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV8032'RECOVERED IN GOOD CONDITION.  NEW DESCRIPTION FOLLOWS.  SET IN THE
 HV8032'NORTH WALL OF THE EAST WING, 6.55 METERS (21.5 FT) EAST OF THE EAST
 HV8032'WALL OF THE WHITE HOUSE.  MARK IS THE TOP OF THE KNOB AT THE END OF
 HV8032'A 1 INCH DIAMETER BRASS PIN THAT PROTRUDES ABOUT 6 INCHES FROM THE
 HV8032'WALL 12 FT ABOVE BLACKTOP AREA.
 HV8032
 HV8032                          STATION RECOVERY (1992)
 HV8032
 HV8032'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV8032'IN WASHINGTON, D.C., AT THE WHITE HOUSE, SET IN THE NORTH WALL, 6.55
 HV8032'METERS (21.49 FT) EAST OF THE EAST WALL OF THE WHITE HOUSE.  MARK IS
 HV8032'THE TOP OF THE KNOB AT THE END OF A 1-INCH DIAMETER BRASS PIN THAT
 HV8032'PROTRUDES ABOUT 6 INCHES FROM THE WALL 12 FEET (3.7 M) ABOVE BLACKTOP
 HV8032'AREA.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2191 ***********************************************************************
 HV2191  DESIGNATION -  SW 151
 HV2191  PID         -  HV2191
 HV2191  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2191  COUNTRY     -  US
 HV2191  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2191
 HV2191                         *CURRENT SURVEY CONTROL
 HV2191  ______________________________________________________________________
 HV2191* NAD 83(1993) POSITION- 38 52 41.14890(N) 077 02 13.35440(W)   ADJUSTED
 HV2191* NAVD 88 ORTHO HEIGHT -     3.777 (meters)       12.39  (feet) ADJUSTED
 HV2191  ______________________________________________________________________
 HV2191  GEOID HEIGHT    -        -32.108 (meters)                     GEOID18
 HV2191  LAPLACE CORR    -         -2.73  (seconds)                    DEFLEC18
 HV2191  DYNAMIC HEIGHT  -          3.775 (meters)       12.39  (feet) COMP
 HV2191  MODELED GRAVITY -    980,096.9   (mgal)                       NAVD 88
 HV2191
 HV2191  HORZ ORDER      -  SECOND
 HV2191  VERT ORDER      -  FIRST     CLASS I
 HV2191
 HV2191.The horizontal coordinates were established by classical geodetic methods
 HV2191.and adjusted by the National Geodetic Survey in November 1994.
 HV2191
 HV2191.The orthometric height was determined by differential leveling and
 HV2191.adjusted by the NATIONAL GEODETIC SURVEY
 HV2191.in June 1991.
 HV2191
 HV2191.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2191.GEOID18 height accuracy estimate available here.
 HV2191
 HV2191.Click photographs - Photos may exist for this station.
 HV2191
 HV2191.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2191
 HV2191.The dynamic height is computed by dividing the NAVD 88
 HV2191.geopotential number by the normal gravity value computed on the
 HV2191.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2191.degrees latitude (g = 980.6199 gals.).
 HV2191
 HV2191.The modeled gravity was interpolated from observed gravity values.
 HV2191
 HV2191. The following values were computed from the NAD 83(1993) position.
 HV2191
 HV2191;                    North         East     Units Scale Factor Converg.
 HV2191;SPC MD       -   134,474.540   396,785.770   MT  0.99994985   -0 01 23.7
 HV2191;SPC MD       -   441,188.55  1,301,787.98   sFT  0.99994985   -0 01 23.7
 HV2191;SPC VA N     - 2,135,480.169 3,626,937.270   MT  0.99995870   +0 54 47.0
 HV2191;SPC VA N     - 7,006,154.52 11,899,376.69   sFT  0.99995870   +0 54 47.0
 HV2191;UTM  18      - 4,305,221.058   323,298.632   MT  0.99998449   -1 16 44.1
 HV2191
 HV2191!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2191!SPC MD       -   1.00000445  x   0.99994985  =   0.99995429
 HV2191!SPC VA N     -   1.00000445  x   0.99995870  =   0.99996314
 HV2191!UTM  18      -   1.00000445  x   0.99998449  =   0.99998894
 HV2191
 HV2191:                Primary Azimuth Mark                     Grid Az
 HV2191:SPC MD       -  COMMERCE                                 013 01 05.4
 HV2191:SPC VA N     -  COMMERCE                                 012 04 54.7
 HV2191:UTM  18      -  COMMERCE                                 014 16 25.8
 HV2191
 HV2191_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2329805221(NAD 83)
 HV2191
 HV2191|---------------------------------------------------------------------|
 HV2191| PID    Reference Object                     Distance      Geod. Az  |
 HV2191|                                                           dddmmss.s |
 HV2191| HV4243 COMMERCE                            APPROX. 1.6 KM 0125941.7 |
 HV2191|---------------------------------------------------------------------|
 HV2191
 HV2191                          SUPERSEDED SURVEY CONTROL
 HV2191
 HV2191  NAD 83(1991)-  38 52 41.14767(N)    077 02 13.35572(W) AD(       ) 2
 HV2191  NAD 83(1986)-  38 52 41.14733(N)    077 02 13.36652(W) AD(       ) 2
 HV2191  NAD 27      -  38 52 40.74650(N)    077 02 14.44410(W) AD(       ) 2
 HV2191  NGVD 29               4.01   (m)           13.2    (f) LEVELING    3  
 HV2191  NGVD 29 (11/26/84)    4.014  (m)           13.17   (f) ADJUSTED    1 1
 HV2191
 HV2191.Superseded values are not recommended for survey control.
 HV2191
 HV2191.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2191.See file dsdata.pdf to determine how the superseded data were derived.
 HV2191
 HV2191_MARKER: DD = SURVEY DISK
 HV2191_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2191_SP_SET: MONUMENT
 HV2191_STAMPING: USCGS NO SW 151
 HV2191_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2191
 HV2191  HISTORY     - Date     Condition        Report By
 HV2191  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2191  HISTORY     - 1960     GOOD             MADHOP
 HV2191  HISTORY     - 1971     GOOD             NGS
 HV2191  HISTORY     - 1971     GOOD             NGS
 HV2191  HISTORY     - 1978     MARK NOT FOUND   DMA
 HV2191  HISTORY     - 19920512 MARK NOT FOUND   NGS
 HV2191
 HV2191                          STATION DESCRIPTION
 HV2191
 HV2191'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2191'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2191'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO S.W. 151 SET
 HV2191'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2191'COVER WITH LID LABELED SURVEY.
 HV2191
 HV2191                          STATION RECOVERY (1960)
 HV2191
 HV2191'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2191'IN WASHINGTON DC.
 HV2191'LOCATED ADJACENT TO OHIO DR. S.W. WHERE THE NORTHBOUND ROADWAY
 HV2191'OF ROCHAM BEAU BRIDGE CROSSES OVER OHIO DR.  61.10 FT SOUTHEAST
 HV2191'OF NORTHEAST CORNER OF BRIDGE SUPPORT, AND 97.45 FT SOUTHEAST
 HV2191'OF ROCHAM BEAU BRIDGE ROAD EDGE.  A STANDARD BRASS DISC SET IN
 HV2191'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2191'COVER WITH LID LABELED SURVEY.
 HV2191
 HV2191                          STATION RECOVERY (1971)
 HV2191
 HV2191'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2191'STATION RECOVERED UNDER MANHOLE LID AS DESCRIBED.  HOWEVER, THE
 HV2191'BRIDGE HAS BEEN REMODELED.  A CORRECTION IN MEASUREMENTS ARE
 HV2191'GIVEN.  THE 61.10 FT. MEASUREMENT SHOULD BE 57.3 FT..  THE 97.45
 HV2191'FT. MEASUREMENT GIVEN SHOULD BE 97.6 FT.  IT IS ALSO 118.8 FEET
 HV2191'NORTHEAST FROM THE NORTH EDGE OF PAVEMENT OF OHIO DRIVE S.W.
 HV2191'
 HV2191'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2191'IN DIST. OF COL.
 HV2191
 HV2191                          STATION RECOVERY (1971)
 HV2191
 HV2191'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971
 HV2191'RECOVERED IN GOOD CONDITION.
 HV2191
 HV2191                          STATION RECOVERY (1978)
 HV2191
 HV2191'RECOVERY NOTE BY DEFENSE MAP AGENCY 1978
 HV2191'MARK NOT FOUND.
 HV2191
 HV2191                          STATION RECOVERY (1992)
 HV2191
 HV2191'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV2191'A THOROUGH SEARCH REVEALED NO EVIDENCE OF THE MARK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2196 ***********************************************************************
 HV2196  DESIGNATION -  SW 166
 HV2196  PID         -  HV2196
 HV2196  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2196  COUNTRY     -  US
 HV2196  USGS QUAD   -  ALEXANDRIA (2019)
 HV2196
 HV2196                         *CURRENT SURVEY CONTROL
 HV2196  ______________________________________________________________________
 HV2196* NAD 83(1993) POSITION- 38 49 44.58501(N) 077 01 02.40058(W)   ADJUSTED
 HV2196* NAVD 88 ORTHO HEIGHT -    22.452 (meters)       73.66  (feet) ADJUSTED
 HV2196  ______________________________________________________________________
 HV2196  GEOID HEIGHT    -        -32.217 (meters)                     GEOID18
 HV2196  LAPLACE CORR    -         -2.89  (seconds)                    DEFLEC18
 HV2196  DYNAMIC HEIGHT  -         22.440 (meters)       73.62  (feet) COMP
 HV2196  MODELED GRAVITY -    980,090.4   (mgal)                       NAVD 88
 HV2196
 HV2196  HORZ ORDER      -  SECOND
 HV2196  VERT ORDER      -  SECOND    CLASS 0
 HV2196
 HV2196.The horizontal coordinates were established by classical geodetic methods
 HV2196.and adjusted by the National Geodetic Survey in November 1994.
 HV2196
 HV2196.The orthometric height was determined by differential leveling and
 HV2196.adjusted by the NATIONAL GEODETIC SURVEY
 HV2196.in June 1991.
 HV2196
 HV2196.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2196.GEOID18 height accuracy estimate available here.
 HV2196
 HV2196.Click photographs - Photos may exist for this station.
 HV2196
 HV2196.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2196
 HV2196.The dynamic height is computed by dividing the NAVD 88
 HV2196.geopotential number by the normal gravity value computed on the
 HV2196.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2196.degrees latitude (g = 980.6199 gals.).
 HV2196
 HV2196.The modeled gravity was interpolated from observed gravity values.
 HV2196
 HV2196. The following values were computed from the NAD 83(1993) position.
 HV2196
 HV2196;                    North         East     Units Scale Factor Converg.
 HV2196;SPC MD       -   129,029.628   398,494.930   MT  0.99995018   -0 00 39.2
 HV2196;SPC MD       -   423,324.70  1,307,395.45   sFT  0.99995018   -0 00 39.2
 HV2196;SPC VA N     - 2,130,063.874 3,628,735.186   MT  0.99995518   +0 55 31.3
 HV2196;SPC VA N     - 6,988,384.56 11,905,275.36   sFT  0.99995518   +0 55 31.3
 HV2196;UTM  18      - 4,299,739.847   324,888.178   MT  0.99997761   -1 15 54.7
 HV2196
 HV2196!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2196!SPC MD       -   1.00000153  x   0.99995018  =   0.99995171
 HV2196!SPC VA N     -   1.00000153  x   0.99995518  =   0.99995671
 HV2196!UTM  18      -   1.00000153  x   0.99997761  =   0.99997914
 HV2196
 HV2196:                Primary Azimuth Mark                     Grid Az
 HV2196:SPC MD       -  POTOMAC PARK SOUTHEAST BASE RESET        352 09 32.1
 HV2196:SPC VA N     -  POTOMAC PARK SOUTHEAST BASE RESET        351 13 21.6
 HV2196:UTM  18      -  POTOMAC PARK SOUTHEAST BASE RESET        353 24 47.6
 HV2196
 HV2196_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2488899739(NAD 83)
 HV2196
 HV2196|---------------------------------------------------------------------|
 HV2196| PID    Reference Object                     Distance      Geod. Az  |
 HV2196|                                                           dddmmss.s |
 HV2196| HV4716 S W 166 A 1960                      344.101 METERS 03813     |
 HV2196| HV2015 POTOMAC PARK SOUTHEAST BASE RESET   APPROX. 3.1 KM 3520852.9 |
 HV2196|---------------------------------------------------------------------|
 HV2196
 HV2196                          SUPERSEDED SURVEY CONTROL
 HV2196
 HV2196  NAD 83(1991)-  38 49 44.58355(N)    077 01 02.40189(W) AD(       ) 2
 HV2196  NAD 83(1986)-  38 49 44.58318(N)    077 01 02.41351(W) AD(       ) 2
 HV2196  NAD 27      -  38 49 44.17630(N)    077 01 03.49300(W) AD(       ) 2
 HV2196  NGVD 29              22.70   (m)           74.5    (f) LEVELING    3  
 HV2196  NGVD 29 (11/26/84)   22.700  (m)           74.47   (f) ADJUSTED    2 0
 HV2196
 HV2196.Superseded values are not recommended for survey control.
 HV2196
 HV2196.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2196.See file dsdata.pdf to determine how the superseded data were derived.
 HV2196
 HV2196_MARKER: DD = SURVEY DISK
 HV2196_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV2196_SP_SET: MONUMENT
 HV2196_STAMPING: USCGS NO SW 166
 HV2196_MARK LOGO: DC001
 HV2196_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV2196+STABILITY: SURFACE MOTION
 HV2196
 HV2196  HISTORY     - Date     Condition        Report By
 HV2196  HISTORY     - 1960     MONUMENTED       MADHOP
 HV2196  HISTORY     - 1960     GOOD             MADHOP
 HV2196  HISTORY     - 1971     GOOD             NGS
 HV2196
 HV2196                          STATION DESCRIPTION
 HV2196
 HV2196'DESCRIBED BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV2196'STATION IS A STANDARD BRASS DISC STAMPED DISTRICT OF COLUMBIA
 HV2196'DEPARTMENT OF HIGHWAYS AND TRAFFIC - USC AND GS NO SW 166 SET
 HV2196'IN TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2196'COVER WITH LID LABELED SURVEY.
 HV2196
 HV2196                          STATION RECOVERY (1960)
 HV2196
 HV2196'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2196'IN WASHINGTON DC.
 HV2196'LOCATED NEAR INTERSECTION OF OVERLOOK AVE. S.W. AND CHESAPEAKE
 HV2196'ST. S.W.  BETWEEN OVERLOOK AVE AND ENTRANCE TO BOLLING FIELD.
 HV2196'150 FT PLUS OR MINUS NORTH OF ROAD EDGE OF CHESAPEAKE ST., AND
 HV2196'NORTH OF P.E.P.C.O. POLE 526867.  A STANDARD BRASS DISC SET IN
 HV2196'TOP OF 12 IN CONCRETE MONUMENT SURMOUNTED BY A STANDARD MANHOLE
 HV2196'COVER WITH LID LABELED SURVEY.
 HV2196
 HV2196                          STATION RECOVERY (1971)
 HV2196
 HV2196'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2196'STATION AND REFERENCE POINTS RECOVERED IN GOOD CONDITION.  NO
 HV2196'MEASUREMENTS WERE GIVEN IN DESCRIPTION TO REFERENCE POINTS, THEY
 HV2196'ARE GIVEN HERE AND MAY BE REFERRED TO THE SKETCH OF THE
 HV2196'DESCRIPTION--78 FEET SOUTH OF FENCE CORNER, 68 FEET SOUTH OF END
 HV2196'OF EXTENSION ON FENCE FROM CORNER, 56.5 FEET SOUTH OF CENTER OF A
 HV2196'STREET LIGHT POLE, 9.4 FEET WEST OF EDGE OF PAVEMENT AND LOW
 HV2196'CURB, AND 32 FEET NORTH OF PEPCO POLE NO. 526867.  STATION IS
 HV2196'UNDER MANHOLE COVER MARKED SURVEY.
 HV2196'
 HV2196'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2196'IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7996 ***********************************************************************
 HV7996  DESIGNATION -  SW 4
 HV7996  PID         -  HV7996
 HV7996  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7996  COUNTRY     -  US
 HV7996  USGS QUAD   -  WASHINGTON WEST (2016)
 HV7996
 HV7996                         *CURRENT SURVEY CONTROL
 HV7996  ______________________________________________________________________
 HV7996* NAD 83(1986) POSITION- 38 53 50.     (N) 077 02 11.     (W)   SCALED
 HV7996* NAVD 88 ORTHO HEIGHT -    19.632 (meters)       64.41  (feet) ADJUSTED
 HV7996  ______________________________________________________________________
 HV7996  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 HV7996  DYNAMIC HEIGHT  -         19.622 (meters)       64.38  (feet) COMP
 HV7996  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 HV7996
 HV7996  VERT ORDER      -  FIRST     CLASS 0
 HV7996
 HV7996.The horizontal coordinates were scaled from a map and have
 HV7996.an estimated accuracy of +/- 6 seconds.
 HV7996
 HV7996.The orthometric height was determined by differential leveling and
 HV7996.adjusted by the NATIONAL GEODETIC SURVEY
 HV7996.in June 1991.
 HV7996
 HV7996.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7996.GEOID18 height accuracy estimate available here.
 HV7996
 HV7996.Click photographs - Photos may exist for this station.
 HV7996
 HV7996.The dynamic height is computed by dividing the NAVD 88
 HV7996.geopotential number by the normal gravity value computed on the
 HV7996.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV7996.degrees latitude (g = 980.6199 gals.).
 HV7996
 HV7996.The modeled gravity was interpolated from observed gravity values.
 HV7996
 HV7996
 HV7996_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234073(NAD 83)
 HV7996
 HV7996                          SUPERSEDED SURVEY CONTROL
 HV7996
 HV7996  NGVD 29 (08/12/92)   19.863  (m)           65.17   (f) ADJUSTED    1 0
 HV7996
 HV7996.Superseded values are not recommended for survey control.
 HV7996
 HV7996.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7996.See file dsdata.pdf to determine how the superseded data were derived.
 HV7996
 HV7996_MARKER: Z = SEE DESCRIPTION
 HV7996_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV7996_SP_SET: BUILDING
 HV7996_MARK LOGO: NONE
 HV7996_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV7996_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV7996
 HV7996  HISTORY     - Date     Condition        Report By
 HV7996  HISTORY     - 1949     MONUMENTED       CGS
 HV7996  HISTORY     - 1978     GOOD             NGS
 HV7996  HISTORY     - 1978     GOOD             NGS
 HV7996  HISTORY     - 1982     GOOD             NGS
 HV7996  HISTORY     - 19920615 GOOD             NGS
 HV7996
 HV7996                          STATION DESCRIPTION
 HV7996
 HV7996'DESCRIBED BY NATIONAL GEODETIC SURVEY 1978
 HV7996'IN WASHINGTON DC.
 HV7996'THE MARK IS 12 FT ABOVE GROUND.
 HV7996'AT THE WHITE HOUSE, 13 FEET WEST OF THE CENTER OF THE SOUTH ENTRANCE
 HV7996'TO THE CHINESE ROOM.  WHITE HOUSE WALL MARK.
 HV7996
 HV7996                          STATION RECOVERY (1978)
 HV7996
 HV7996'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV7996'THE MARK IS 12 FT ABOVE GROUND.
 HV7996'AT THE WHITE HOUSE, 13 FEET WEST OF THE CENTER OF THE SOUTH ENTRANCE
 HV7996'TO THE CHINESE ROOM.  WHITE HOUSE WALL MARK.
 HV7996
 HV7996                          STATION RECOVERY (1982)
 HV7996
 HV7996'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1982
 HV7996'RECOVERED IN GOOD CONDITION.  NEW DESCRIPTION FOLLOWS. AT THE WHITE
 HV7996'HOUSE 3.96 METERS (13 FT) WEST OF THE CENTER OF THE SOUTH ENTRANCE TO
 HV7996'THE CHINESE ROOM.  MARK IS THE TOP OF THE KNOB AT THE END OF A 1 INCH
 HV7996'DIAMETER BRASS PIN THAT PRATRUDES ABOUT 6 INCHES FROM THE WALL 12 FT
 HV7996'ABOVE THE GROUND.
 HV7996
 HV7996                          STATION RECOVERY (1992)
 HV7996
 HV7996'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV7996'IN WASHINGTON, D.C., AT THE WHITE HOUSE, 3.96 METERS (12.99 FT) WEST
 HV7996'OF THE CENTER OF THE SOUTH ENTRANCE TO THE CHINESE ROOM, MARK IS THE
 HV7996'TOP OF THE KNOB AT THE END OF A 1-INCH DIAMETER BRASS PIN THAT
 HV7996'PROTRUDES ABOUT 6 INCHES FROM THE WALL 12 FT (3.7 M) ABOVE THE
 HV7996'GROUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4404 ***********************************************************************
 HV4404  DESIGNATION -  SWANK
 HV4404  PID         -  HV4404
 HV4404  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4404  COUNTRY     -  US
 HV4404  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4404
 HV4404                         *CURRENT SURVEY CONTROL
 HV4404  ______________________________________________________________________
 HV4404* NAD 83(1993) POSITION- 38 55 54.28884(N) 077 03 19.83516(W)   ADJUSTED
 HV4404  ______________________________________________________________________
 HV4404  GEOID HEIGHT    -        -31.992 (meters)                     GEOID18
 HV4404  LAPLACE CORR    -         -2.77  (seconds)                    DEFLEC18
 HV4404  HORZ ORDER      -  THIRD
 HV4404
 HV4404.The horizontal coordinates were established by classical geodetic methods
 HV4404.and adjusted by the National Geodetic Survey in November 1994.
 HV4404
 HV4404.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4404.GEOID18 height accuracy estimate available here.
 HV4404
 HV4404.Click photographs - Photos may exist for this station.
 HV4404
 HV4404.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4404
 HV4404. The following values were computed from the NAD 83(1993) position.
 HV4404
 HV4404;                    North         East     Units Scale Factor Converg.
 HV4404;SPC MD       -   140,430.935   395,187.012   MT  0.99995032   -0 02 05.4
 HV4404;SPC MD       -   460,730.49  1,296,542.72   sFT  0.99995032   -0 02 05.4
 HV4404;SPC VA N     - 2,141,409.707 3,625,241.370   MT  0.99996339   +0 54 05.5
 HV4404;SPC VA N     - 7,025,608.35 11,893,812.73   sFT  0.99996339   +0 54 05.5
 HV4404;UTM  18      - 4,311,211.302   321,830.807   MT  0.99999090   -1 17 31.2
 HV4404
 HV4404_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2183011211(NAD 83)
 HV4404
 HV4404                          SUPERSEDED SURVEY CONTROL
 HV4404
 HV4404  NAD 83(1991)-  38 55 54.28803(N)    077 03 19.83635(W) AD(       ) 3
 HV4404  NAD 83(1986)-  38 55 54.28761(N)    077 03 19.84659(W) AD(       ) 3
 HV4404  NAD 27      -  38 55 53.88800(N)    077 03 20.92300(W) AD(       ) 3
 HV4404
 HV4404.Superseded values are not recommended for survey control.
 HV4404
 HV4404.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4404.See file dsdata.pdf to determine how the superseded data were derived.
 HV4404
 HV4404_MARKER: 82 = FINIAL
 HV4404_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4404+SATELLITE: SATELLITE OBSERVATIONS - March 19, 2009
 HV4404
 HV4404  HISTORY     - Date     Condition        Report By
 HV4404  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4404  HISTORY     - 1971     GOOD             NGS
 HV4404  HISTORY     - 20021024 GOOD             INDIV
 HV4404  HISTORY     - 20090319 GOOD             GEOCAC
 HV4404
 HV4404                          STATION DESCRIPTION
 HV4404
 HV4404'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4404'THE STATION IS THE CENTER OF THE FINIAL ON THE WESTERN END
 HV4404'OF THE HIP ROOF ABOVE THE ENTRANCE OF THE KENNEDY WARREN,
 HV4404'APARTMENT HOUSE, 3133 CONNECTICUT AVE., N.W.
 HV4404
 HV4404                          STATION RECOVERY (1971)
 HV4404
 HV4404'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4404'STATION WAS RECOVERED AS PREVIOUSLY DESCRIBED.  THE ORIGINAL
 HV4404'DESCRIPTION IS ADEQUATE.
 HV4404
 HV4404                          STATION RECOVERY (2002)
 HV4404
 HV4404'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 HV4404'RECOVERED IN GOOD CONDITION.
 HV4404
 HV4404                          STATION RECOVERY (2009)
 HV4404
 HV4404'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV4404'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1974 ***********************************************************************
 HV1974  DESIGNATION -  T
 HV1974  PID         -  HV1974
 HV1974  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1974  COUNTRY     -  US
 HV1974  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1974
 HV1974                         *CURRENT SURVEY CONTROL
 HV1974  ______________________________________________________________________
 HV1974* NAD 83(1986) POSITION- 38 53 14.1    (N) 077 00 28.4    (W)   HD_HELD2
 HV1974* NAVD 88 ORTHO HEIGHT -    22.528 (meters)       73.91  (feet) ADJUSTED
 HV1974  ______________________________________________________________________
 HV1974  GEOID HEIGHT    -        -32.135 (meters)                     GEOID18
 HV1974  DYNAMIC HEIGHT  -         22.516 (meters)       73.87  (feet) COMP
 HV1974  MODELED GRAVITY -    980,100.3   (mgal)                       NAVD 88
 HV1974
 HV1974  VERT ORDER      -  FIRST     CLASS I
 HV1974
 HV1974.The horizontal coordinates were established by autonomous hand held GPS
 HV1974.observations and have an estimated accuracy of +/- 10 meters.
 HV1974
 HV1974.The orthometric height was determined by differential leveling and
 HV1974.adjusted by the NATIONAL GEODETIC SURVEY
 HV1974.in June 1991.
 HV1974
 HV1974.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1974.GEOID18 height accuracy estimate available here.
 HV1974
 HV1974.Click photographs - Photos may exist for this station.
 HV1974
 HV1974.The dynamic height is computed by dividing the NAVD 88
 HV1974.geopotential number by the normal gravity value computed on the
 HV1974.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1974.degrees latitude (g = 980.6199 gals.).
 HV1974
 HV1974.The modeled gravity was interpolated from observed gravity values.
 HV1974
 HV1974
 HV1974_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2585006180(NAD 83)
 HV1974
 HV1974                          SUPERSEDED SURVEY CONTROL
 HV1974
 HV1974  NGVD 29 (11/26/84)   22.765  (m)           74.69   (f) ADJUSTED    1 1
 HV1974
 HV1974.Superseded values are not recommended for survey control.
 HV1974
 HV1974.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1974.See file dsdata.pdf to determine how the superseded data were derived.
 HV1974
 HV1974_MARKER: DB = BENCH MARK DISK
 HV1974_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1974_SP_SET: WATER TABLE
 HV1974_STAMPING: T 1923
 HV1974_MARK LOGO: CGS
 HV1974_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1974
 HV1974  HISTORY     - Date     Condition        Report By
 HV1974  HISTORY     - 1923     MONUMENTED       CGS
 HV1974  HISTORY     - 1971     GOOD             NGS
 HV1974
 HV1974                          STATION DESCRIPTION
 HV1974
 HV1974'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1974'AT WASHINGTON.
 HV1974'AT WASHINGTON, D.C., AT THE INTERSECTION OF INDEPENDENCE AND NEW
 HV1974'JERSEY AVENUES, ABOUT 0.2 MILE SOUTHEAST OF THE SOUTHEAST CORNER
 HV1974'OF THE CAPITOL BUILDING, SET IN THE TOP OF A MARBLE WATER TABLE
 HV1974'AT THE BOTTOM OF A STONE VERANDA AND RAILING WHICH SURROUNDS THE
 HV1974'WEST SIDE OF THE OLD HOUSE OFFICE BUILDING, 48.7 FEET SOUTH OF THE
 HV1974'SOUTHWEST CORNER OF THE BOTTOM STEP AT STREET LEVEL, 46 1/2 FEET
 HV1974'EAST OF THE CENTER LINE OF NEW JERSEY AVENUE, 0.3 FOOT WEST OF THE
 HV1974'WEST FACE OF THE VERANDA WALL, AND 0.8 FOOT ABOVE THE LEVEL OF THE
 HV1974'SIDEWALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1970 ***********************************************************************
 HV1970  DESIGNATION -  T 1
 HV1970  PID         -  HV1970
 HV1970  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1970  COUNTRY     -  US
 HV1970  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1970
 HV1970                         *CURRENT SURVEY CONTROL
 HV1970  ______________________________________________________________________
 HV1970* NAD 83(1986) POSITION- 38 53 50.3    (N) 077 00 26.2    (W)   HD_HELD2
 HV1970* NAVD 88 ORTHO HEIGHT -    18.572 (meters)       60.93  (feet) ADJUSTED
 HV1970  ______________________________________________________________________
 HV1970  GEOID HEIGHT    -        -32.115 (meters)                     GEOID18
 HV1970  DYNAMIC HEIGHT  -         18.562 (meters)       60.90  (feet) COMP
 HV1970  MODELED GRAVITY -    980,102.9   (mgal)                       NAVD 88
 HV1970
 HV1970  VERT ORDER      -  FIRST     CLASS II
 HV1970
 HV1970.The horizontal coordinates were established by autonomous hand held GPS
 HV1970.observations and have an estimated accuracy of +/- 10 meters.
 HV1970
 HV1970.The orthometric height was determined by differential leveling and
 HV1970.adjusted by the NATIONAL GEODETIC SURVEY
 HV1970.in October 2012.
 HV1970
 HV1970.No vertical observational check was made to the station.
 HV1970
 HV1970.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1970.GEOID18 height accuracy estimate available here.
 HV1970
 HV1970.Click photographs - Photos may exist for this station.
 HV1970
 HV1970.The dynamic height is computed by dividing the NAVD 88
 HV1970.geopotential number by the normal gravity value computed on the
 HV1970.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1970.degrees latitude (g = 980.6199 gals.).
 HV1970
 HV1970.The modeled gravity was interpolated from observed gravity values.
 HV1970
 HV1970
 HV1970_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2592707295(NAD 83)
 HV1970
 HV1970                          SUPERSEDED SURVEY CONTROL
 HV1970
 HV1970  NAVD 88 (06/15/91)   18.580  (m)           60.96   (f) SUPERSEDED  1 1
 HV1970  NGVD 29 (11/26/84)   18.814  (m)           61.73   (f) ADJUSTED    1 1
 HV1970
 HV1970.Superseded values are not recommended for survey control.
 HV1970
 HV1970.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1970.See file dsdata.pdf to determine how the superseded data were derived.
 HV1970
 HV1970_MARKER: DB = BENCH MARK DISK
 HV1970_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1970_SP_SET: PEDESTAL
 HV1970_STAMPING: T 1 1929
 HV1970_MARK LOGO: CGS
 HV1970_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1970_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1970+SATELLITE: SATELLITE OBSERVATIONS - March 16, 2020
 HV1970
 HV1970  HISTORY     - Date     Condition        Report By
 HV1970  HISTORY     - 1929     MONUMENTED       CGS
 HV1970  HISTORY     - 1971     GOOD             NGS
 HV1970  HISTORY     - 1974     GOOD             NGS
 HV1970  HISTORY     - 1978     GOOD             DMA
 HV1970  HISTORY     - 1979     GOOD             NGS
 HV1970  HISTORY     - 20030713 GOOD             GEOCAC
 HV1970  HISTORY     - 20080320 GOOD             NGS
 HV1970  HISTORY     - 20090319 GOOD             GEOCAC
 HV1970  HISTORY     - 20100109 GOOD             GEOCAC
 HV1970  HISTORY     - 20120301 GOOD             NGS
 HV1970  HISTORY     - 20180716 GOOD             USPSQD
 HV1970  HISTORY     - 20200316 GOOD             MDSHA
 HV1970
 HV1970                          STATION DESCRIPTION
 HV1970
 HV1970'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1970'AT WASHINGTON.
 HV1970'AT WASHINGTON, D.C., ON THE SOUTHWEST SIDE OF UNION STATION,
 HV1970'10 FEET SOUTHEAST OF SOUTHEAST EDGE OF THE TAXICAB STATION,
 HV1970'IN THE SOUTH CORNER OF THE SQUARE PEDESTAL OF THE COLUMN, AND
 HV1970'3.5 FEET ABOVE THE LEVEL OF THE STREET.  A STANDARD DISK, STAMPED
 HV1970'T 1 1929.  NOTE-- CONSTRUCTION IS IN PROGRESS AROUND THE STATION
 HV1970'AT THIS TIME.  THE CONSTRUCTION FOREMAN INFORMED THIS PARTY THAT
 HV1970'CONSIDERABLE CHANGE WOULD BE MADE IN THE NEAR FUTURE, BUT THE
 HV1970'MARK WOULD BE PRESERVED IF POSSIBLE.  IT IS IMPRACTICAL TO WRITE
 HV1970'A NEW DESCRIPTION AT THIS TIME.
 HV1970
 HV1970                          STATION RECOVERY (1974)
 HV1970
 HV1970'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974
 HV1970'RECOVERED IN GOOD CONDITION.
 HV1970
 HV1970                          STATION RECOVERY (1978)
 HV1970
 HV1970'RECOVERY NOTE BY DEFENSE MAP AGENCY 1978
 HV1970'RECOVERED IN GOOD CONDITION.
 HV1970
 HV1970                          STATION RECOVERY (1979)
 HV1970
 HV1970'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1970'RECOVERED IN GOOD CONDITION.
 HV1970
 HV1970                          STATION RECOVERY (2003)
 HV1970
 HV1970'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV1970'FORMER TAXI AREA IS NOW LOCATION OF ESCALATOR DOWN TO METRO SUBWAY.
 HV1970'THE STATION DISK IS PLACED HORIZONTALLY ON THE SQUARE BASE OF A
 HV1970'HALF-COLUMN TO THE RIGHT (EAST) OF A LARGE ARCHWAY AT THE WEST END OF
 HV1970'THE SOUTHERN (MAIN) FACADE OF UNION STATION.
 HV1970'
 HV1970'THE DISK IS LOCATED APPROXIMATELY 66 FEET SOUTH OF THE SOUTH SIDE OF
 HV1970'THE GRANITE WALL SURROUNDING THE METRO ESCALATORS AND ABOUT 55 FEET
 HV1970'EAST OF A METRO PYLON LOCATED AT THE SOUTHWEST EXTERIOR CORNER OF THE
 HV1970'UNION STATION BUILDING.
 HV1970
 HV1970                          STATION RECOVERY (2008)
 HV1970
 HV1970'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DRD)
 HV1970'RECOVERED IN GOOD CONDITION.
 HV1970
 HV1970                          STATION RECOVERY (2009)
 HV1970
 HV1970'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV1970'RECOVERED IN GOOD CONDITION.
 HV1970
 HV1970                          STATION RECOVERY (2010)
 HV1970
 HV1970'RECOVERY NOTE BY GEOCACHING 2010 (MFM)
 HV1970'RECOVERED IN GOOD CONDITION.
 HV1970
 HV1970                          STATION RECOVERY (2012)
 HV1970
 HV1970'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1970'RECOVERED AS DESCRIBED.
 HV1970
 HV1970                          STATION RECOVERY (2018)
 HV1970
 HV1970'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV1970'RECOVERED IN GOOD CONDITION.
 HV1970
 HV1970                          STATION RECOVERY (2020)
 HV1970
 HV1970'RECOVERY NOTE BY MARYLAND DOT HIGHWAY ADMINISTRATION 2020 (JML)
 HV1970'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4615 ***********************************************************************
 HV4615  DESIGNATION -  T 4
 HV4615  PID         -  HV4615
 HV4615  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4615  COUNTRY     -  US
 HV4615  USGS QUAD   -  ALEXANDRIA (2019)
 HV4615
 HV4615                         *CURRENT SURVEY CONTROL
 HV4615  ______________________________________________________________________
 HV4615* NAD 83(1993) POSITION- 38 52 22.88528(N) 077 03 03.07745(W)   ADJUSTED
 HV4615* NAVD 88 ORTHO HEIGHT -    -0.    (meters)       -0.    (feet) SCALED
 HV4615  ______________________________________________________________________
 HV4615  GEOID HEIGHT    -        -32.097 (meters)                     GEOID18
 HV4615  LAPLACE CORR    -         -2.89  (seconds)                    DEFLEC18
 HV4615  HORZ ORDER      -  SECOND
 HV4615
 HV4615.The horizontal coordinates were established by classical geodetic methods
 HV4615.and adjusted by the National Geodetic Survey in November 1994.
 HV4615
 HV4615.The orthometric height was scaled from a topographic map.
 HV4615
 HV4615.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4615.GEOID18 height accuracy estimate available here.
 HV4615
 HV4615.Click photographs - Photos may exist for this station.
 HV4615
 HV4615.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4615
 HV4615. The following values were computed from the NAD 83(1993) position.
 HV4615
 HV4615;                    North         East     Units Scale Factor Converg.
 HV4615;SPC MD       -   133,911.951   395,586.986   MT  0.99994985   -0 01 54.9
 HV4615;SPC MD       -   439,342.79  1,297,854.97   sFT  0.99994985   -0 01 54.9
 HV4615;SPC VA N     - 2,134,898.060 3,625,747.829   MT  0.99995830   +0 54 16.0
 HV4615;SPC VA N     - 7,004,244.72 11,895,474.34   sFT  0.99995830   +0 54 16.0
 HV4615;UTM  18      - 4,304,684.852   322,087.763   MT  0.99998978   -1 17 14.8
 HV4615
 HV4615!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4615!SPC MD       -   1.00000508  x   0.99994985  =   0.99995492
 HV4615!SPC VA N     -   1.00000508  x   0.99995830  =   0.99996337
 HV4615!UTM  18      -   1.00000508  x   0.99998978  =   0.99999486
 HV4615
 HV4615_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2208704684(NAD 83)
 HV4615
 HV4615                          SUPERSEDED SURVEY CONTROL
 HV4615
 HV4615  NAD 83(1991)-  38 52 22.88395(N)    077 03 03.07899(W) AD(       ) 2
 HV4615  NAD 83(1986)-  38 52 22.88382(N)    077 03 03.08973(W) AD(       ) 2
 HV4615  NAD 27      -  38 52 22.48300(N)    077 03 04.16500(W) AD(       ) 2
 HV4615
 HV4615.Superseded values are not recommended for survey control.
 HV4615
 HV4615.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4615.See file dsdata.pdf to determine how the superseded data were derived.
 HV4615
 HV4615_MARKER: DD = SURVEY DISK
 HV4615_SETTING: 21 = SET IN CONCRETE IN A CLAY TILE PIPE
 HV4615_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4615
 HV4615  HISTORY     - Date     Condition        Report By
 HV4615  HISTORY     - 1924     MONUMENTED       USACE
 HV4615  HISTORY     - 1940     MARK NOT FOUND   CGS
 HV4615
 HV4615                          STATION DESCRIPTION
 HV4615
 HV4615'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1924 (EWE)
 HV4615'STATION IS ON THE WESTERN SIDE OF THE POTOMAC RIVER ESTABLISHED
 HV4615'TO MARK THE OLD HIGH-WATER LINE OF ALEXANDERS ISLAND, LOCATED
 HV4615'143 METERS W OF THE PRESENT HIGH-WATER LINE AND SW OF THE
 HV4615'MILITARY ROAD.  MARKED BY A STANDARD U.S.E. DISK SET IN CONCRETE
 HV4615'IN A TILE PIPE.  ADDITIONAL MARKING TO BE MADE BY THE BUREAU
 HV4615'OF PUBLIC BUILDINGS AND GROUNDS.
 HV4615
 HV4615                          STATION RECOVERY (1940)
 HV4615
 HV4615'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV4615'THIS STATION HAS BEEN LOST BY CONSTRUCTION AT THE WASHINGTON
 HV4615'HOOVER AIRPORT NEAR THE BOUNDARY CHANNEL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1833 ***********************************************************************
 HV1833  DESIGNATION -  T 4 WMATA
 HV1833  PID         -  HV1833
 HV1833  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1833  COUNTRY     -  US
 HV1833  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1833
 HV1833                         *CURRENT SURVEY CONTROL
 HV1833  ______________________________________________________________________
 HV1833* NAD 83(1986) POSITION- 38 54 00.     (N) 077 02 18.     (W)   SCALED
 HV1833* NAVD 88 ORTHO HEIGHT -    20.259 (meters)       66.47  (feet) ADJUSTED
 HV1833  ______________________________________________________________________
 HV1833  GEOID HEIGHT    -        -32.063 (meters)                     GEOID18
 HV1833  DYNAMIC HEIGHT  -         20.248 (meters)       66.43  (feet) COMP
 HV1833  MODELED GRAVITY -    980,097.5   (mgal)                       NAVD 88
 HV1833
 HV1833  VERT ORDER      -  FIRST     CLASS 0
 HV1833
 HV1833.The horizontal coordinates were scaled from a map and have
 HV1833.an estimated accuracy of +/- 6 seconds.
 HV1833
 HV1833.The orthometric height was determined by differential leveling and
 HV1833.adjusted by the NATIONAL GEODETIC SURVEY
 HV1833.in June 1991.
 HV1833
 HV1833.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1833.GEOID18 height accuracy estimate available here.
 HV1833
 HV1833.Click photographs - Photos may exist for this station.
 HV1833
 HV1833.The dynamic height is computed by dividing the NAVD 88
 HV1833.geopotential number by the normal gravity value computed on the
 HV1833.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1833.degrees latitude (g = 980.6199 gals.).
 HV1833
 HV1833.The modeled gravity was interpolated from observed gravity values.
 HV1833
 HV1833
 HV1833_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ232076(NAD 83)
 HV1833
 HV1833                          SUPERSEDED SURVEY CONTROL
 HV1833
 HV1833  NGVD 29 (11/26/84)   20.491  (m)           67.23   (f) ADJUSTED    1 0
 HV1833
 HV1833.Superseded values are not recommended for survey control.
 HV1833
 HV1833.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1833.See file dsdata.pdf to determine how the superseded data were derived.
 HV1833
 HV1833_MARKER: Z = SEE DESCRIPTION
 HV1833_SETTING: 66 = SET IN ROCK OUTCROP
 HV1833_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 HV1833+STABILITY: POSITION/ELEVATION WELL
 HV1833
 HV1833  HISTORY     - Date     Condition        Report By
 HV1833  HISTORY     - UNK      MONUMENTED       WMATA
 HV1833  HISTORY     - 1974     GOOD             NGS
 HV1833  HISTORY     - 1978     GOOD             NGS
 HV1833  HISTORY     - 1978     GOOD             NGS
 HV1833  HISTORY     - 1979     GOOD             NGS
 HV1833  HISTORY     - 1989     MARK NOT FOUND   USPSQD
 HV1833
 HV1833                          STATION DESCRIPTION
 HV1833
 HV1833'DESCRIBED BY NATIONAL GEODETIC SURVEY 1974
 HV1833'IN WASHINGTON.
 HV1833'THE BM IS IN THE WEST SIDEWALK ON CONNECTICUT AVE., N.W. IN
 HV1833'FRONT OF THE NATIONAL BANK OF WASHINGTON AT THE INTERSECTION OF
 HV1833'H ST. AND CONN. AVE., 4 M FROM THE WEST CURB OF CONN. AVE.,
 HV1833'8 M FROM THE EAST WALL OF THE BANK BUILDING, 30 M NW FROM THE
 HV1833'NORTH CURB OF H ST.  THE MARK CONSISTS OF A 3 1/2 IN. DIA.
 HV1833'OUTER PIPE SET ON THE BEDROCK AND A 2 IN. DIA. INNER PIPE
 HV1833'CEMENTED INTO THE BEDROCK. A 2 1/8 IN. DIA. STAINLESS STEEL
 HV1833'BALL IS WELDED TO THE TOP OF THE INNER PIPE.  A ROUND CAST
 HV1833'IRON BOX WITH A COVER SET FLUSH WITH THE SIDEWALK PROTECTS THE
 HV1833'BM.
 HV1833
 HV1833                          STATION RECOVERY (1978)
 HV1833
 HV1833'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV1833'RECOVERED IN GOOD CONDITION.
 HV1833
 HV1833                          STATION RECOVERY (1978)
 HV1833
 HV1833'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
 HV1833'RECOVERED IN GOOD CONDITION.
 HV1833
 HV1833                          STATION RECOVERY (1979)
 HV1833
 HV1833'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1833'RECOVERED IN GOOD CONDITION.
 HV1833
 HV1833                          STATION RECOVERY (1989)
 HV1833
 HV1833'RECOVERY NOTE BY US POWER SQUADRON 1989 (NJP)
 HV1833'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4454 ***********************************************************************
 HV4454  DESIGNATION -  T USE 1913
 HV4454  PID         -  HV4454
 HV4454  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4454  COUNTRY     -  US
 HV4454  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4454
 HV4454                         *CURRENT SURVEY CONTROL
 HV4454  ______________________________________________________________________
 HV4454* NAD 83(1993) POSITION- 38 52 36.92960(N) 077 01 35.72948(W)   ADJUSTED
 HV4454* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV4454  ______________________________________________________________________
 HV4454  GEOID HEIGHT    -        -32.125 (meters)                     GEOID18
 HV4454  LAPLACE CORR    -         -2.89  (seconds)                    DEFLEC18
 HV4454  HORZ ORDER      -  THIRD
 HV4454
 HV4454.The horizontal coordinates were established by classical geodetic methods
 HV4454.and adjusted by the National Geodetic Survey in November 1994.
 HV4454
 HV4454.The orthometric height was scaled from a topographic map.
 HV4454
 HV4454.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4454.GEOID18 height accuracy estimate available here.
 HV4454
 HV4454.Click photographs - Photos may exist for this station.
 HV4454
 HV4454.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4454
 HV4454. The following values were computed from the NAD 83(1993) position.
 HV4454
 HV4454;                    North         East     Units Scale Factor Converg.
 HV4454;SPC MD       -   134,344.120   397,692.602   MT  0.99994985   -0 01 00.1
 HV4454;SPC MD       -   440,760.67  1,304,763.15   sFT  0.99994985   -0 01 00.1
 HV4454;SPC VA N     - 2,135,364.583 3,627,846.120   MT  0.99995861   +0 55 10.5
 HV4454;SPC VA N     - 7,005,775.30 11,902,358.48   sFT  0.99995861   +0 55 10.5
 HV4454;UTM  18      - 4,305,070.792   324,202.418   MT  0.99998057   -1 16 20.3
 HV4454
 HV4454!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4454!SPC MD       -   1.00000492  x   0.99994985  =   0.99995477
 HV4454!SPC VA N     -   1.00000492  x   0.99995861  =   0.99996353
 HV4454!UTM  18      -   1.00000492  x   0.99998057  =   0.99998549
 HV4454
 HV4454:                Primary Azimuth Mark                     Grid Az
 HV4454:SPC MD       -  POTOMAC PARK NW BASE                     280 56 30.1
 HV4454:SPC VA N     -  POTOMAC PARK NW BASE                     280 00 19.5
 HV4454:UTM  18      -  POTOMAC PARK NW BASE                     282 11 50.3
 HV4454
 HV4454_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2420205070(NAD 83)
 HV4454
 HV4454|---------------------------------------------------------------------|
 HV4454| PID    Reference Object                     Distance      Geod. Az  |
 HV4454|                                                           dddmmss.s |
 HV4454| HV1998 POTOMAC PARK NW BASE                APPROX. 0.6 KM 2805530.0 |
 HV4454|---------------------------------------------------------------------|
 HV4454
 HV4454                          SUPERSEDED SURVEY CONTROL
 HV4454
 HV4454  NAD 83(1991)-  38 52 36.92825(N)    077 01 35.73075(W) AD(       ) 3
 HV4454  NAD 83(1986)-  38 52 36.92790(N)    077 01 35.74161(W) AD(       ) 3
 HV4454  NAD 27      -  38 52 36.52600(N)    077 01 36.82000(W) AD(       ) 3
 HV4454  USSD        -  38 52 36.86400(N)    077 01 36.65200(W) AD(       ) 3
 HV4454
 HV4454.Superseded values are not recommended for survey control.
 HV4454
 HV4454.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4454.See file dsdata.pdf to determine how the superseded data were derived.
 HV4454
 HV4454_MARKER: H = DRILL HOLE
 HV4454_SETTING: 0 = UNSPECIFIED SETTING
 HV4454_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4454
 HV4454  HISTORY     - Date     Condition        Report By
 HV4454  HISTORY     - 1913     MONUMENTED       USACE
 HV4454  HISTORY     - 1939     MARK NOT FOUND   CGS
 HV4454
 HV4454                          STATION DESCRIPTION
 HV4454
 HV4454'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1913 (OBF)
 HV4454'STATION IS ON HARBOR SIDE OF POTOMAC PARK ABOUT 700 METERS S OF
 HV4454'RAILROAD.  IT IS SOME 50 FEET S OF THE END OF THE STRAIGHT PART
 HV4454'OF THE SEA WALL AND IS A 3/4-INCH DRILL HOLE 1 INCH DEEP IN THE
 HV4454'TOP OF THE SEA WALL.
 HV4454
 HV4454                          STATION RECOVERY (1939)
 HV4454
 HV4454'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4454'STATION IS LOST.  THE SEA WALL AT THIS PLACE HAS BEEN REPAIRED
 HV4454'AND THE MARK IS DESTROYED OR COVERED OVER WITH MASONRY.  THE
 HV4454'STATION WAS DESCRIBED IN 1913 AS T, U.S.E.  THERE IS AT PRESENT A
 HV4454'STATION CALLED TEE (U.S.E.) 1931, MARKED BY A TRIANGULATION
 HV4454'DISK OF THE U.S.E., THE GEOGRAPHIC POSITION OF WHICH IS WITHIN
 HV4454'ABOUT 1 METER OF THAT OF T. HOWEVER, THE TWO STATIONS ARE
 HV4454'BELIEVED TO BE ENTIRELY DIFFERENT, AND IT IS THOUGHT THAT THE
 HV4454'1931 STATION WAS PUT IN AND LOCATED TO REPLACE THE LOST 1913
 HV4454'STATION, RATHER THAN TO PRESERVE THE ORIGINAL POSITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4438 ***********************************************************************
 HV4438  DESIGNATION -  TB 1913
 HV4438  PID         -  HV4438
 HV4438  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4438  COUNTRY     -  US
 HV4438  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4438
 HV4438                         *CURRENT SURVEY CONTROL
 HV4438  ______________________________________________________________________
 HV4438* NAD 83(1993) POSITION- 38 52 44.30169(N) 077 02 22.75610(W)   ADJUSTED
 HV4438* NAVD 88 ORTHO HEIGHT -     3.    (meters)       10.    (feet) SCALED
 HV4438  ______________________________________________________________________
 HV4438  GEOID HEIGHT    -        -32.103 (meters)                     GEOID18
 HV4438  LAPLACE CORR    -         -2.70  (seconds)                    DEFLEC18
 HV4438  HORZ ORDER      -  SECOND
 HV4438
 HV4438.The horizontal coordinates were established by classical geodetic methods
 HV4438.and adjusted by the National Geodetic Survey in November 1994.
 HV4438
 HV4438.The orthometric height was scaled from a topographic map.
 HV4438
 HV4438.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4438.GEOID18 height accuracy estimate available here.
 HV4438
 HV4438.Click photographs - Photos may exist for this station.
 HV4438
 HV4438.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4438
 HV4438. The following values were computed from the NAD 83(1993) position.
 HV4438
 HV4438;                    North         East     Units Scale Factor Converg.
 HV4438;SPC MD       -   134,571.853   396,559.204   MT  0.99994985   -0 01 29.6
 HV4438;SPC MD       -   441,507.82  1,301,044.66   sFT  0.99994985   -0 01 29.6
 HV4438;SPC VA N     - 2,135,573.767 3,626,709.142   MT  0.99995877   +0 54 41.1
 HV4438;SPC VA N     - 7,006,461.60 11,898,628.24   sFT  0.99995877   +0 54 41.1
 HV4438;UTM  18      - 4,305,323.316   323,074.245   MT  0.99998547   -1 16 50.1
 HV4438
 HV4438!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4438!SPC MD       -   1.00000460  x   0.99994985  =   0.99995445
 HV4438!SPC VA N     -   1.00000460  x   0.99995877  =   0.99996337
 HV4438!UTM  18      -   1.00000460  x   0.99998547  =   0.99999007
 HV4438
 HV4438:                Primary Azimuth Mark                     Grid Az
 HV4438:SPC MD       -  FARM                                     278 52 22.8
 HV4438:SPC VA N     -  FARM                                     277 56 12.1
 HV4438:UTM  18      -  FARM                                     280 07 43.3
 HV4438
 HV4438_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2307405323(NAD 83)
 HV4438
 HV4438|---------------------------------------------------------------------|
 HV4438| PID    Reference Object                     Distance      Geod. Az  |
 HV4438|                                                           dddmmss.s |
 HV4438| HV4441 RR                                  447.264 METERS 1294828.2 |
 HV4438| HV4610 SIGNAL TOWER                        APPROX. 1.1 KM 1951219.2 |
 HV4438| HV4337 FARM                                APPROX. 1.4 KM 2785053.2 |
 HV4438|---------------------------------------------------------------------|
 HV4438
 HV4438                          SUPERSEDED SURVEY CONTROL
 HV4438
 HV4438  NAD 83(1991)-  38 52 44.30037(N)    077 02 22.75754(W) AD(       ) 2
 HV4438  NAD 83(1986)-  38 52 44.30012(N)    077 02 22.76826(W) AD(       ) 2
 HV4438  NAD 27      -  38 52 43.90100(N)    077 02 23.84500(W) AD(       ) 2
 HV4438  USSD        -  38 52 44.23800(N)    077 02 23.67500(W) AD(       ) 3
 HV4438
 HV4438.Superseded values are not recommended for survey control.
 HV4438
 HV4438.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4438.See file dsdata.pdf to determine how the superseded data were derived.
 HV4438
 HV4438_MARKER: Z = SEE DESCRIPTION
 HV4438_SETTING: 0 = UNSPECIFIED SETTING
 HV4438_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4438
 HV4438  HISTORY     - Date     Condition        Report By
 HV4438  HISTORY     - 1913     MONUMENTED       CGS
 HV4438  HISTORY     - 1924     GOOD             CGS
 HV4438  HISTORY     - 1939     MARK NOT FOUND   CGS
 HV4438
 HV4438                          STATION DESCRIPTION
 HV4438
 HV4438'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4438'STATION IS IN CONCRETE MONUMENT, 8-INCH TERRA COTTA PIPE,
 HV4438'CENTERED WITH 1/2-INCH BRASS PIPE, 0.3 FOOT ABOVE GROUND,
 HV4438'ABOUT 6 FEET ABOVE MEAN LOW WATER, 3.8 FEET E OF EDGE OF
 HV4438'SEA WALL, 18.5 FEET W OF 12-INCH WILLOW TREE, 55 FEET SE OF
 HV4438'36-INCH GUARDED WILLOW TREE.
 HV4438
 HV4438                          STATION RECOVERY (1924)
 HV4438
 HV4438'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1924 (EWE)
 HV4438'STATION RECOVERED AS DESCRIBED.  THE MARK IS 40 METERS N
 HV4438'OF THE HIGHWAY BRIDGE.
 HV4438
 HV4438                          STATION RECOVERY (1939)
 HV4438
 HV4438'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4438'STATION IS LOST.  THE SEA WALL AT THIS PLACE HAS BEEN REPAIRED
 HV4438'AND A CONCRETE WALK CONSTRUCTED WHICH HAS EITHER DESTROYED
 HV4438'OR COVERED OVER THE OLD MARK IF IT WAS NOT LOST PREVIOUSLY.
 HV4438'
 HV4438'A BRASS TRIANGULATION DISK OF THE PUBLIC BUILDINGS AND PUBLIC
 HV4438'PARKS IS SE IN THE WALK AND STAMPED TB 1.  THIS IS PROBABLY
 HV4438'THE MARK WHICH WAS LOCATED BY THE PUBLIC BUILDINGS AND PUBLIC
 HV4438'PARKS ABOUT 1933 AND CALLED TB U.S.E.  THE POSITION OF THIS
 HV4438'POINT IS WITHIN ABOUT 1 METER OF THE POSITION OF THE OLD STATION,
 HV4438'TB 1913, BUT IT IS BELIEVED THAT THE TWO ARE ENTIRELY DISTINCT
 HV4438'STATIONS, AND THAT THE NEWER ONE WAS SET AND LOCATED TO REPLACE
 HV4438'THE OLDER, LOST, 1913 STATION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7731 ***********************************************************************
 HV7731  DESIGNATION -  TEE
 HV7731  PID         -  HV7731
 HV7731  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7731  COUNTRY     -  US
 HV7731  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7731
 HV7731                         *CURRENT SURVEY CONTROL
 HV7731  ______________________________________________________________________
 HV7731* NAD 83(1993) POSITION- 38 52 34.20733(N) 076 58 07.68234(W)   ADJUSTED
 HV7731* NAVD 88 ORTHO HEIGHT -     9.15  (+/-2cm)       30.0   (feet) VERTCON3
 HV7731  ______________________________________________________________________
 HV7731  GEOID HEIGHT    -        -32.224 (meters)                     GEOID18
 HV7731  LAPLACE CORR    -         -3.28  (seconds)                    DEFLEC18
 HV7731  HORZ ORDER      -  THIRD
 HV7731  VERT ORDER      -  THIRD ? (See Below)
 HV7731
 HV7731.The horizontal coordinates were established by classical geodetic methods
 HV7731.and adjusted by the National Geodetic Survey in November 1994.
 HV7731
 HV7731.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV7731.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV7731
 HV7731.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7731.GEOID18 height accuracy estimate available here.
 HV7731
 HV7731.The vertical order pertains to the NGVD 29 superseded value.
 HV7731
 HV7731.Click photographs - Photos may exist for this station.
 HV7731
 HV7731.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7731
 HV7731. The following values were computed from the NAD 83(1993) position.
 HV7731
 HV7731;                    North         East     Units Scale Factor Converg.
 HV7731;SPC MD       -   134,260.305   402,707.256   MT  0.99994985   +0 01 10.5
 HV7731;SPC MD       -   440,485.68  1,321,215.39   sFT  0.99994985   +0 01 10.5
 HV7731;SPC VA N     - 2,135,362.711 3,632,861.518   MT  0.99995855   +0 57 20.3
 HV7731;SPC VA N     - 7,005,769.16 11,918,813.16   sFT  0.99995855   +0 57 20.3
 HV7731;UTM  18      - 4,304,877.109   329,214.131   MT  0.99995918   -1 14 09.6
 HV7731
 HV7731!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7731!SPC MD       -   1.00000362  x   0.99994985  =   0.99995347
 HV7731!SPC VA N     -   1.00000362  x   0.99995855  =   0.99996217
 HV7731!UTM  18      -   1.00000362  x   0.99995918  =   0.99996280
 HV7731
 HV7731:                Primary Azimuth Mark                     Grid Az
 HV7731:SPC MD       -  END                                      267 49 30.2
 HV7731:SPC VA N     -  END                                      266 53 20.4
 HV7731:UTM  18      -  END                                      269 04 50.3
 HV7731
 HV7731_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2921404877(NAD 83)
 HV7731
 HV7731|---------------------------------------------------------------------|
 HV7731| PID    Reference Object                     Distance      Geod. Az  |
 HV7731|                                                           dddmmss.s |
 HV7731| HV7733 L USE 1931                          APPROX. 0.6 KM 0144428.5 |
 HV7731| HV7725 END                                 APPROX. 0.6 KM 2675040.7 |
 HV7731|---------------------------------------------------------------------|
 HV7731
 HV7731                          SUPERSEDED SURVEY CONTROL
 HV7731
 HV7731  NAD 83(1991)-  38 52 34.20595(N)    076 58 07.68347(W) AD(       ) 3
 HV7731  NAD 83(1986)-  38 52 34.20523(N)    076 58 07.69473(W) AD(       ) 3
 HV7731  NAD 27      -  38 52 33.80200(N)    076 58 08.78900(W) AD(       ) 3
 HV7731  NGVD 29               9.39   (m)           30.8    (f) LEVELING    3  
 HV7731
 HV7731.Superseded values are not recommended for survey control.
 HV7731
 HV7731.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7731.See file dsdata.pdf to determine how the superseded data were derived.
 HV7731
 HV7731_MARKER: Z = SEE DESCRIPTION
 HV7731_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7731
 HV7731  HISTORY     - Date     Condition        Report By
 HV7731  HISTORY     - 1931     MONUMENTED       USACE
 HV7731  HISTORY     - 1958     MARK NOT FOUND   CGS
 HV7731
 HV7731                          STATION DESCRIPTION
 HV7731
 HV7731'DESCRIBED BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7731'DUE TO THE LACK OF A DESCRIPTION, THIS STATION IS NOT RECOVERABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4712 ***********************************************************************
 HV4712  DESIGNATION -  THEODORE ROOSEVELT HALL FLGSTF
 HV4712  PID         -  HV4712
 HV4712  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4712  COUNTRY     -  US
 HV4712  USGS QUAD   -  ALEXANDRIA (2019)
 HV4712
 HV4712                         *CURRENT SURVEY CONTROL
 HV4712  ______________________________________________________________________
 HV4712* NAD 83(1993) POSITION- 38 51 47.74751(N) 077 01 01.23772(W)   ADJUSTED
 HV4712  ______________________________________________________________________
 HV4712  GEOID HEIGHT    -        -32.165 (meters)                     GEOID18
 HV4712  LAPLACE CORR    -         -3.01  (seconds)                    DEFLEC18
 HV4712  HORZ ORDER      -  THIRD
 HV4712
 HV4712.The horizontal coordinates were established by classical geodetic methods
 HV4712.and adjusted by the National Geodetic Survey in November 1994.
 HV4712
 HV4712.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4712.GEOID18 height accuracy estimate available here.
 HV4712
 HV4712.Click photographs - Photos may exist for this station.
 HV4712
 HV4712.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4712
 HV4712. The following values were computed from the NAD 83(1993) position.
 HV4712
 HV4712;                    North         East     Units Scale Factor Converg.
 HV4712;SPC MD       -   132,827.372   398,523.686   MT  0.99994987   -0 00 38.4
 HV4712;SPC MD       -   435,784.47  1,307,489.79   sFT  0.99994987   -0 00 38.4
 HV4712;SPC VA N     - 2,133,861.605 3,628,701.883   MT  0.99995756   +0 55 32.0
 HV4712;SPC VA N     - 7,000,844.28 11,905,166.09   sFT  0.99995756   +0 55 32.0
 HV4712;UTM  18      - 4,303,536.155   325,000.093   MT  0.99997712   -1 15 57.3
 HV4712
 HV4712_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2500003536(NAD 83)
 HV4712
 HV4712                          SUPERSEDED SURVEY CONTROL
 HV4712
 HV4712  NAD 83(1991)-  38 51 47.74609(N)    077 01 01.23903(W) AD(       ) 3
 HV4712  NAD 83(1986)-  38 51 47.74575(N)    077 01 01.25004(W) AD(       ) 3
 HV4712  NAD 27      -  38 51 47.34400(N)    077 01 02.33000(W) AD(       ) 3
 HV4712  USSD        -  38 51 47.68200(N)    077 01 02.16000(W) AD(       ) 3
 HV4712
 HV4712.Superseded values are not recommended for survey control.
 HV4712
 HV4712.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4712.See file dsdata.pdf to determine how the superseded data were derived.
 HV4712
 HV4712_MARKER: 83 = FLAGSTAFF
 HV4712
 HV4712  HISTORY     - Date     Condition        Report By
 HV4712  HISTORY     - 1913     FIRST OBSERVED   CGS
 HV4712  HISTORY     - 1939     GOOD             CGS
 HV4712  HISTORY     - 19950810 GOOD             USPSQD
 HV4712
 HV4712                          STATION DESCRIPTION
 HV4712
 HV4712'DESCRIBED BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4712'STATION FOUND.  NOT PREVIOUSLY DESCRIBED.  THERE EXISTS AT
 HV4712'PRESENT A FLAGSTAFF IN THE LOCATION CORRESPONDING TO THE POSITION
 HV4712'OF THIS STATION.  THE CHIEF CLERK AT THE ARMY WAR COLLEGE ASSERTS
 HV4712'THAT THE POSITION OF THE PRESENT FLAGSTAFF IS THE SAME AS IN
 HV4712'1913.  THE STATION WAS USED, AS THUS RECOVERED, IN A 1--00,000
 HV4712'AIR PHOTOGRAPHIC SURVEY IN WHICH THERE WAS A GREAT DEAL OF
 HV4712'OTHER TRIANGULATION CONTROL, AND THE POINT CHECKED.
 HV4712'
 HV4712'THE FLAGSTAFF IS ON THE MAIN BUILDING OF THE ARMY WAR COLLEGE,
 HV4712'OVER THE CENTER OF THE N (MAIN) ENTRANCE, AT THE PEAK OF THE
 HV4712'GABLE, AND ABOUT 5 FEET IN FROM THE FACE.
 HV4712
 HV4712                          STATION RECOVERY (1995)
 HV4712
 HV4712'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4712'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4436 ***********************************************************************
 HV4436  DESIGNATION -  TIDAL USE
 HV4436  PID         -  HV4436
 HV4436  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4436  COUNTRY     -  US
 HV4436  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4436
 HV4436                         *CURRENT SURVEY CONTROL
 HV4436  ______________________________________________________________________
 HV4436* NAD 83(1993) POSITION- 38 52 50.46614(N) 077 02 33.02292(W)   ADJUSTED
 HV4436* NAVD 88 ORTHO HEIGHT -     1.8   (meters)        6.    (feet) VERTCON3
 HV4436  ______________________________________________________________________
 HV4436  GEOID HEIGHT    -        -32.096 (meters)                     GEOID18
 HV4436  LAPLACE CORR    -         -2.66  (seconds)                    DEFLEC18
 HV4436  HORZ ORDER      -  THIRD
 HV4436
 HV4436.The horizontal coordinates were established by classical geodetic methods
 HV4436.and adjusted by the National Geodetic Survey in November 1994.
 HV4436
 HV4436.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4436.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4436
 HV4436.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4436.GEOID18 height accuracy estimate available here.
 HV4436
 HV4436.Click photographs - Photos may exist for this station.
 HV4436
 HV4436.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4436
 HV4436. The following values were computed from the NAD 83(1993) position.
 HV4436
 HV4436;                    North         East     Units Scale Factor Converg.
 HV4436;SPC MD       -   134,762.048   396,311.835   MT  0.99994985   -0 01 36.0
 HV4436;SPC MD       -   442,131.82  1,300,233.08   sFT  0.99994985   -0 01 36.0
 HV4436;SPC VA N     - 2,135,759.896 3,626,458.696   MT  0.99995891   +0 54 34.7
 HV4436;SPC VA N     - 7,007,072.26 11,897,806.57   sFT  0.99995891   +0 54 34.7
 HV4436;UTM  18      - 4,305,518.893   322,831.095   MT  0.99998653   -1 16 56.7
 HV4436
 HV4436!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4436!SPC MD       -   1.00000476  x   0.99994985  =   0.99995461
 HV4436!SPC VA N     -   1.00000476  x   0.99995891  =   0.99996367
 HV4436!UTM  18      -   1.00000476  x   0.99998653  =   0.99999129
 HV4436
 HV4436:                Primary Azimuth Mark                     Grid Az
 HV4436:SPC MD       -  WALK USE 1932                            128 38 15.1
 HV4436:SPC VA N     -  WALK USE 1932                            127 42 04.4
 HV4436:UTM  18      -  WALK USE 1932                            129 53 35.8
 HV4436
 HV4436_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2283105518(NAD 83)
 HV4436
 HV4436|---------------------------------------------------------------------|
 HV4436| PID    Reference Object                     Distance      Geod. Az  |
 HV4436|                                                           dddmmss.s |
 HV4436| HV4440 WALK USE 1932                       APPROX. 0.7 KM 1283639.1 |
 HV4436| HV4279 F B 1913                            APPROX. 0.5 KM 3113211.0 |
 HV4436| HV4291 FB 2 USE 1944                       APPROX. 0.5 KM 3130636.0 |
 HV4436|---------------------------------------------------------------------|
 HV4436
 HV4436                          SUPERSEDED SURVEY CONTROL
 HV4436
 HV4436  NAD 83(1991)-  38 52 50.46485(N)    077 02 33.02441(W) AD(       ) 3
 HV4436  NAD 83(1986)-  38 52 50.46461(N)    077 02 33.03512(W) AD(       ) 3
 HV4436  NAD 27      -  38 52 50.06400(N)    077 02 34.11300(W) AD(       ) 3
 HV4436  NGVD 29 (07/19/86)    2.0    (m)            7.     (f) VERT ANG       
 HV4436
 HV4436.Superseded values are not recommended for survey control.
 HV4436
 HV4436.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4436.See file dsdata.pdf to determine how the superseded data were derived.
 HV4436
 HV4436_MARKER: DD = SURVEY DISK
 HV4436_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV4436_STAMPING: 691
 HV4436_MARK LOGO: USACE
 HV4436_PROJECTION: RECESSED 15 CENTIMETERS
 HV4436_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV4436+STABILITY: SURFACE MOTION
 HV4436
 HV4436  HISTORY     - Date     Condition        Report By
 HV4436  HISTORY     - UNK      MONUMENTED       USACE
 HV4436  HISTORY     - 1946     GOOD             CGS
 HV4436  HISTORY     - 1979     SEE DESCRIPTION  NGS
 HV4436  HISTORY     - 20120429 GOOD             NGS
 HV4436  HISTORY     - 20141106 GOOD             PROFLN
 HV4436
 HV4436                          STATION DESCRIPTION
 HV4436
 HV4436'DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4436'STATION SITE IS IN POTOMAC PARK LOCATED ON THE E SHORE OF THE
 HV4436'POTOMAC RIVER AND ON THE W SHORE OF THE TIDAL BASIN BETWEEN
 HV4436'THE MEMORIAL AND THE HIGHWAY BRIDGES ACROSS THE RIVER.  STATION
 HV4436'IS A CONCRETE MONUMENT SET IN A 4-INCH CAST-IRON PIPE FLUSH WITH
 HV4436'CONCRETE COLLAR HALF-WAY BETWEEN SPEEDWAY AND SEA WALL, 26.4 FEET
 HV4436'IN FROM SEA WALL FACE, AND ABOUT 500 FEET ABOVE INLET GATES TO
 HV4436'THE TIDAL BASIN.
 HV4436'
 HV4436'WILLOW TREE REFERRED TO HAS BEEN REMOVED.
 HV4436
 HV4436                          STATION RECOVERY (1979)
 HV4436
 HV4436'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 (BMP)
 HV4436'THE STATION IS LOCATED IN WASHINGTON D.C. ALONG THE DISTRICT OR
 HV4436'EAST SIDE OF THE POTOMAC RIVER IN WEST POTOMAC PARK.
 HV4436'
 HV4436'TO REACH THE STATION FROM THE LINCOLN MEMORIAL GO SOUTH TO THE
 HV4436'ERICSSON STATUE WHICH IS ON A SMALL TRAFFIC CIRCLE, THEN SOUTH
 HV4436'ALONG THE RIVER ON RIVERSIDE DRIVE FOR 1.0 KM (0.6 MI) TO THE
 HV4436'STATION ON THE RIGHT.
 HV4436'
 HV4436'THE STATION IS A U.S.E.D. DISK STAMPED---691---SET AT GROUND
 HV4436'LEVEL IN A CONCRETE FILLED 13 CM CAST IRON PIPE. THE STATION IS
 HV4436'8.8 METERS (28.9 FT) SOUTH SOUTHWEST OF THE LAST LIGHT POLE,
 HV4436'STAMPED 5-20 ON BOTTOM PLATE, ON THE RIVERSIDE DRIVE
 HV4436'BEFORE THE TURN TO THE GATE BRIDGE, 12.6 METERS (41.4 FT)
 HV4436'NORTHWEST OF A CONCRETE EMBEDDED WATER PIPE WHICH IS IN THE LAWN,
 HV4436'15.9 METERS (52.2 FT) SOUTH SOUTHWEST OF THE CENTERLINE OF THE
 HV4436'DRIVE AND 8.1 METERS (26.6 FT) NORTHEAST OF THE SEAWALL AND
 HV4436'A METER ABOVE THE WATER.
 HV4436'
 HV4436'A TRAVERSE CONNECTION WAS MADE TO STATION MOTOR 1935 AT THIS
 HV4436'TIME.
 HV4436
 HV4436                          STATION RECOVERY (2012)
 HV4436
 HV4436'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (JRO)
 HV4436'THIS MARK IS IN WEST POTOMAC PARK, ABOUT 0.6 MI (1.0 KM) SOUTHEAST
 HV4436'ALONG OHIO DRIVE FROM THE JOHN ERICSSON STATUE, ON THE RIGHT JUST
 HV4436'BEFORE THE LEFT-HAND CURVE OVER THE BRIDGE OVER THE TIDAL INLET.
 HV4436'PARKING RESTRICTIONS MAY APPLY.  CONTACT NATIONAL PARK SERVICE POLICE,
 HV4436'1100 OHIO DRIVE, ON 202-610-7505 WITH ANY QUESTIONS ABOUT ACCESS.  FOR
 HV4436'AZIMUTH REFERENCE, OHIO DRIVE AND THE SIDEWALK ALONG IT RUN SE-NW,
 HV4436'AZIMUTH 130-310 TRUE.
 HV4436'
 HV4436'THE MARK IS 140.6 FT (42.9 M) SE (AZ 140) FROM THE SOUTHEAST EDGE OF A
 HV4436'STREET LIGHT, 126.3 FT (38.5 M) SE (AZ 145) FROM CENTER OF THE
 HV4436'SOUTHEAST ONE OF THREE MANHOLES IN A DRAINAGE STRUCTURE, 51.2 FT (15.6
 HV4436'M) SOUTH-SOUTHEAST (AZ 160) FROM THE NEAR EDGE OF A 12 INCH (30 CM)
 HV4436'TREE, 33.0 FT (10.1 M) SOUTH (AZ 190) FROM A SIGN POST--NO PARKING,
 HV4436'32.3 FT (9.8 M) SW (AZ 220) FROM THE FACE OF GRANITE CURB, 9.0 FT (2.7
 HV4436'M) SOUTHWEST OF THE SOUTHWEST EDGE (GRASS LINE) OF ASPHALT SIDEWALK,
 HV4436'26.4 FT (8.0 M) SW (AZ 240) FROM A 9 INCH (23 CM) TREE, 75.0 FT (22.9
 HV4436'M) WNW (AZ 290) FROM A 16 INCH (41 CM) TREE, 104.0 FT (31.7 M) WNW (AZ
 HV4436'295) FROM A STREET LIGHT, 132.3 FT (40.3 M) NORTHWEST (AZ 305) FROM
 HV4436'THE NEAR EDGE OF A 48 INCH (122 CM) TREE, 170.5 FT (52.0 M) NORTHWEST
 HV4436'(AZ 310) FROM THE NORTHWEST EDGE OF THE CONCRETE PAD FOR TRASH AND
 HV4436'RECYCLING CANS, 8 FT (2.4 M) NORTHEAST OF THE TOP OF BANK AND RIP AND
 HV4436'RAP, 1.5 FT (0.5 M) BELOW SIDEWALK AND 0.5 FT (15 CM) BELOW GROUND.
 HV4436
 HV4436                          STATION RECOVERY (2014)
 HV4436
 HV4436'RECOVERY NOTE BY PROFESSIONAL LAND SURVEYOR 2014 (JRO)
 HV4436'A 12 INCH (30 CM) BY 18 INCH PLASTIC VALVE BOX WITH GREEN LID WAS PUT
 HV4436'AROUND THE MARK TODAY IN COOPERATION WITH THE NATIONAL PARK SERVICE.
 HV4436'NEW PHOTOS WERE TAKEN TO SHOW THE BOX.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4398 ***********************************************************************
 HV4398  DESIGNATION -  TILDEN
 HV4398  PID         -  HV4398
 HV4398  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4398  COUNTRY     -  US
 HV4398  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4398
 HV4398                         *CURRENT SURVEY CONTROL
 HV4398  ______________________________________________________________________
 HV4398* NAD 83(1993) POSITION- 38 56 26.55029(N) 077 03 42.87671(W)   ADJUSTED
 HV4398  ______________________________________________________________________
 HV4398  GEOID HEIGHT    -        -31.971 (meters)                     GEOID18
 HV4398  LAPLACE CORR    -         -3.07  (seconds)                    DEFLEC18
 HV4398  HORZ ORDER      -  THIRD
 HV4398
 HV4398.The horizontal coordinates were established by classical geodetic methods
 HV4398.and adjusted by the National Geodetic Survey in November 1994.
 HV4398
 HV4398.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4398.GEOID18 height accuracy estimate available here.
 HV4398
 HV4398.Click photographs - Photos may exist for this station.
 HV4398
 HV4398.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4398
 HV4398. The following values were computed from the NAD 83(1993) position.
 HV4398
 HV4398;                    North         East     Units Scale Factor Converg.
 HV4398;SPC MD       -   141,426.098   394,632.735   MT  0.99995049   -0 02 19.9
 HV4398;SPC MD       -   463,995.46  1,294,724.23   sFT  0.99995049   -0 02 19.9
 HV4398;SPC VA N     - 2,142,395.693 3,624,670.897   MT  0.99996426   +0 53 51.1
 HV4398;SPC VA N     - 7,028,843.20 11,891,941.10   sFT  0.99996426   +0 53 51.1
 HV4398;UTM  18      - 4,312,218.430   321,298.478   MT  0.99999324   -1 17 46.6
 HV4398
 HV4398_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2129812218(NAD 83)
 HV4398
 HV4398                          SUPERSEDED SURVEY CONTROL
 HV4398
 HV4398  NAD 83(1991)-  38 56 26.54961(N)    077 03 42.87796(W) AD(       ) 3
 HV4398  NAD 83(1986)-  38 56 26.54916(N)    077 03 42.88809(W) AD(       ) 3
 HV4398  NAD 27      -  38 56 26.15000(N)    077 03 43.96500(W) AD(       ) 3
 HV4398
 HV4398.Superseded values are not recommended for survey control.
 HV4398
 HV4398.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4398.See file dsdata.pdf to determine how the superseded data were derived.
 HV4398
 HV4398_MARKER: Z = SEE DESCRIPTION
 HV4398_SETTING: 0 = UNSPECIFIED SETTING
 HV4398_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4398
 HV4398  HISTORY     - Date     Condition        Report By
 HV4398  HISTORY     - 1943     MONUMENTED       CGS
 HV4398
 HV4398                          STATION DESCRIPTION
 HV4398
 HV4398'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4398'STATION IS CENTER OF VENT PIPE EXTENDED WITH 6-FOOT SECTION OF
 HV4398'2-INCH GALVANIZED IRON PIPE PAINTED WHITE ON ROOF OF TILDEN
 HV4398'GARDENS, APARTMENT HOUSE, 3000 TILDEN ST., N.W.
 HV4398'
 HV4398'STATION IS 3.780 METERS NORTHEAST OF THE NORTHEAST CORNER OF
 HV4398'NORTHERMOST PENTHOUSE, 2,860 METERS SOUTHEAST OF NORTHWEST INNER
 HV4398'CORNER OF PARAPET AND 2.085 METERS NORTHWEST OF SOUTHWEST INNER
 HV4398'CORNER OF PARAPET AND 1.290 METERS FROM PARAPET OF COURT RECESS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7653 ***********************************************************************
 HV7653  DESIGNATION -  TOP WSSD 1931
 HV7653  PID         -  HV7653
 HV7653  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7653  COUNTRY     -  US
 HV7653  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7653
 HV7653                         *CURRENT SURVEY CONTROL
 HV7653  ______________________________________________________________________
 HV7653* NAD 83(1993) POSITION- 38 53 14.09504(N) 076 55 00.19315(W)   ADJUSTED
 HV7653* NAVD 88 ORTHO HEIGHT -    64.    (meters)      210.    (feet) SCALED
 HV7653  ______________________________________________________________________
 HV7653  GEOID HEIGHT    -        -32.319 (meters)                     GEOID18
 HV7653  LAPLACE CORR    -         -4.69  (seconds)                    DEFLEC18
 HV7653  HORZ ORDER      -  THIRD
 HV7653
 HV7653.The horizontal coordinates were established by classical geodetic methods
 HV7653.and adjusted by the National Geodetic Survey in November 1994.
 HV7653
 HV7653.The orthometric height was scaled from a topographic map.
 HV7653
 HV7653.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7653.GEOID18 height accuracy estimate available here.
 HV7653
 HV7653.Click photographs - Photos may exist for this station.
 HV7653
 HV7653.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7653
 HV7653. The following values were computed from the NAD 83(1993) position.
 HV7653
 HV7653;                    North         East     Units Scale Factor Converg.
 HV7653;SPC MD       -   135,493.094   407,225.292   MT  0.99994987   +0 03 08.2
 HV7653;SPC MD       -   444,530.26  1,336,038.31   sFT  0.99994987   +0 03 08.2
 HV7653;SPC VA N     - 2,136,669.150 3,637,358.854   MT  0.99995944   +0 59 17.4
 HV7653;SPC VA N     - 7,010,055.37 11,933,568.17   sFT  0.99995944   +0 59 17.4
 HV7653;UTM  18      - 4,306,010.591   333,758.097   MT  0.99994032   -1 12 12.9
 HV7653
 HV7653!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7653!SPC MD       -   0.99999507  x   0.99994987  =   0.99994494
 HV7653!SPC VA N     -   0.99999507  x   0.99995944  =   0.99995451
 HV7653!UTM  18      -   0.99999507  x   0.99994032  =   0.99993539
 HV7653
 HV7653:                Primary Azimuth Mark                     Grid Az
 HV7653:SPC MD       -  CAPITOL STATUE OF FREEDOM HEAD           272 00 31.3
 HV7653:SPC VA N     -  CAPITOL STATUE OF FREEDOM HEAD           271 04 22.1
 HV7653:UTM  18      -  CAPITOL STATUE OF FREEDOM HEAD           273 15 52.4
 HV7653
 HV7653_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3375806010(NAD 83)
 HV7653
 HV7653|---------------------------------------------------------------------|
 HV7653| PID    Reference Object                     Distance      Geod. Az  |
 HV7653|                                                           dddmmss.s |
 HV7653| HV4150 CAPITOL STATUE OF FREEDOM HEAD      APPROX. 8.0 KM 2720339.5 |
 HV7653|---------------------------------------------------------------------|
 HV7653
 HV7653                          SUPERSEDED SURVEY CONTROL
 HV7653
 HV7653  NAD 83(1991)-  38 53 14.09431(N)    076 55 00.19374(W) AD(       ) 3
 HV7653  NAD 83(1986)-  38 53 14.09321(N)    076 55 00.20532(W) AD(       ) 3
 HV7653  NAD 27      -  38 53 13.69100(N)    076 55 01.30400(W) AD(       ) 3
 HV7653
 HV7653.Superseded values are not recommended for survey control.
 HV7653
 HV7653.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7653.See file dsdata.pdf to determine how the superseded data were derived.
 HV7653
 HV7653
 HV7653  HISTORY     - Date     Condition        Report By
 HV7653  HISTORY     - 1931     MONUMENTED       CGS
 HV7653  HISTORY     - 1955     GOOD             CGS
 HV7653
 HV7653                          STATION DESCRIPTION
 HV7653
 HV7653'DESCRIBED BY COAST AND GEODETIC SURVEY 1955 (JHP)
 HV7653'BRASS SCREW IN AN IRON PIPE.  AT TOP OF HILL ON SOUTHERN
 HV7653'AVENUE.  1,000 FEET SOUTHWEST OF THE INTERSECTION OF SOUTHERN
 HV7653'AVENUE AND SIXTY-FIRST STREET.  HUB IS IN THE CENTER OF A
 HV7653'FOOTPATH OVER THE TOP OF A HILL.
 HV7653'
 HV7653'DESCRIPTION--D.C. BOUNDARY STONE BM 157 ON SOUTHERN AVENUE,
 HV7653'1,000 FEET SOUTHWEST OF THE SIXTY-FIRST STREET INTERSECTION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2032 ***********************************************************************
 HV2032  DESIGNATION -  TP 4=AIRPLANE COMPASS
 HV2032  PID         -  HV2032
 HV2032  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2032  COUNTRY     -  US
 HV2032  USGS QUAD   -  ALEXANDRIA (2019)
 HV2032
 HV2032                         *CURRENT SURVEY CONTROL
 HV2032  ______________________________________________________________________
 HV2032* NAD 83(1986) POSITION- 38 51 16.     (N) 077 00 29.     (W)   SCALED
 HV2032* NAVD 88 ORTHO HEIGHT -     1.615 (meters)        5.30  (feet) ADJUSTED
 HV2032  ______________________________________________________________________
 HV2032  GEOID HEIGHT    -        -32.191 (meters)                     GEOID18
 HV2032  DYNAMIC HEIGHT  -          1.614 (meters)        5.30  (feet) COMP
 HV2032  MODELED GRAVITY -    980,092.9   (mgal)                       NAVD 88
 HV2032
 HV2032  VERT ORDER      -  FIRST     CLASS II
 HV2032
 HV2032.The horizontal coordinates were scaled from a map and have
 HV2032.an estimated accuracy of +/- 6 seconds.
 HV2032
 HV2032.The orthometric height was determined by differential leveling and
 HV2032.adjusted by the NATIONAL GEODETIC SURVEY
 HV2032.in June 1991.
 HV2032
 HV2032.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2032.GEOID18 height accuracy estimate available here.
 HV2032
 HV2032.Click photographs - Photos may exist for this station.
 HV2032
 HV2032.The dynamic height is computed by dividing the NAVD 88
 HV2032.geopotential number by the normal gravity value computed on the
 HV2032.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2032.degrees latitude (g = 980.6199 gals.).
 HV2032
 HV2032.The modeled gravity was interpolated from observed gravity values.
 HV2032
 HV2032
 HV2032_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ257025(NAD 83)
 HV2032
 HV2032                          SUPERSEDED SURVEY CONTROL
 HV2032
 HV2032  NGVD 29 (11/26/84)    1.874  (m)            6.15   (f) ADJUSTED    1 2
 HV2032
 HV2032.Superseded values are not recommended for survey control.
 HV2032
 HV2032.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2032.See file dsdata.pdf to determine how the superseded data were derived.
 HV2032
 HV2032_MARKER: DB = BENCH MARK DISK
 HV2032_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2032_SP_SET: CONCRETE CIRCLE
 HV2032_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2032
 HV2032  HISTORY     - Date     Condition        Report By
 HV2032  HISTORY     - UNK      MONUMENTED       CGS
 HV2032  HISTORY     - 1944     GOOD             CGS
 HV2032  HISTORY     - 1956     GOOD             CGS
 HV2032
 HV2032                          STATION DESCRIPTION
 HV2032
 HV2032'DESCRIBED BY COAST AND GEODETIC SURVEY 1944
 HV2032'IN WASHINGTON.
 HV2032'IN SOUTHEAST WASHINGTON, AT THE NAVAL AIR STATION, 0.25 MILE
 HV2032'WST-SOUTHWEST OF THE MAIN GATE, 0.2 MILE EAST-NORTHEAST OF THE
 HV2032'ADMINISTRATION BUILDING, 61 FEET SOUTHEAST OF THE CENTERLINE
 HV2032'OF THE MACADAM ROAD LEADING TO THE STATION, AND AT THE CENTER
 HV2032'OF A 34-FOOT CONCRETE CIRCLE.  THE TOP OF A 5-INCH BRONZE
 HV2032'DISK, PROJECTING 1 INCH ABOVE THE CONCRETE.
 HV2032
 HV2032                          STATION RECOVERY (1956)
 HV2032
 HV2032'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956
 HV2032'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1786 ***********************************************************************
 HV1786  DESIGNATION -  TPP 243 WSSC
 HV1786  PID         -  HV1786
 HV1786  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1786  COUNTRY     -  US
 HV1786  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1786
 HV1786                         *CURRENT SURVEY CONTROL
 HV1786  ______________________________________________________________________
 HV1786* NAD 83(1986) POSITION- 38 58 45.     (N) 077 01 12.     (W)   SCALED
 HV1786* NAVD 88 ORTHO HEIGHT -    93.294 (meters)      306.08  (feet) ADJUSTED
 HV1786  ______________________________________________________________________
 HV1786  GEOID HEIGHT    -        -31.991 (meters)                     GEOID18
 HV1786  DYNAMIC HEIGHT  -         93.244 (meters)      305.92  (feet) COMP
 HV1786  MODELED GRAVITY -    980,090.2   (mgal)                       NAVD 88
 HV1786
 HV1786  VERT ORDER      -  FIRST     CLASS II
 HV1786
 HV1786.The horizontal coordinates were scaled from a map and have
 HV1786.an estimated accuracy of +/- 6 seconds.
 HV1786
 HV1786.The orthometric height was determined by differential leveling and
 HV1786.adjusted by the NATIONAL GEODETIC SURVEY
 HV1786.in June 1991.
 HV1786
 HV1786.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1786.GEOID18 height accuracy estimate available here.
 HV1786
 HV1786.Click photographs - Photos may exist for this station.
 HV1786
 HV1786.The dynamic height is computed by dividing the NAVD 88
 HV1786.geopotential number by the normal gravity value computed on the
 HV1786.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1786.degrees latitude (g = 980.6199 gals.).
 HV1786
 HV1786.The modeled gravity was interpolated from observed gravity values.
 HV1786
 HV1786
 HV1786_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ250164(NAD 83)
 HV1786
 HV1786                          SUPERSEDED SURVEY CONTROL
 HV1786
 HV1786  NGVD 29 (11/26/84)   93.505  (m)          306.77   (f) ADJUSTED    1 2
 HV1786
 HV1786.Superseded values are not recommended for survey control.
 HV1786
 HV1786.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1786.See file dsdata.pdf to determine how the superseded data were derived.
 HV1786
 HV1786_MARKER: Z = SEE DESCRIPTION
 HV1786_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1786_SP_SET: BOUNDARY MONUMENT
 HV1786_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1786
 HV1786  HISTORY     - Date     Condition        Report By
 HV1786  HISTORY     - UNK      MONUMENTED       WSSC
 HV1786  HISTORY     - 1933     GOOD             CGS
 HV1786  HISTORY     - 1951     MARK NOT FOUND   CGS
 HV1786
 HV1786                          STATION DESCRIPTION
 HV1786
 HV1786'DESCRIBED BY COAST AND GEODETIC SURVEY 1933
 HV1786'AT TAKOMA PARK.
 HV1786'AT TAKOMA PARK, MONTGOMERY COUNTY, MARYLAND, ON THE METROPOLITAN
 HV1786'BRANCH OF THE BALTIMORE AND OHIO RAILROAD, ABOUT 1000 FEET SOUTHEAST
 HV1786'OF THE SITE OF THE OLD NORTH TAKOMA STATION, 30 FEET EAST OF THE
 HV1786'CENTERLINE OF THE NORTHBOUND TRACK, 50 FEET WEST OF THE CENTERLINE
 HV1786'OF TAKOMA AVENUE, AT A GRANITE BOUNDARY STONE MARKING THE
 HV1786'MARYLAND-DISTRICT OF COLUMBIA LINE, AND ABOUT 2 FEET ABOVE THE
 HV1786'TOP OF THE RAIL.  THE EAST CORNER OF THE STONE BOUNDARY MONUMENT.
 HV1786
 HV1786                          STATION RECOVERY (1951)
 HV1786
 HV1786'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1951
 HV1786'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7672 ***********************************************************************
 HV7672  DESIGNATION -  TRAINING 1912
 HV7672  PID         -  HV7672
 HV7672  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7672  COUNTRY     -  US
 HV7672  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7672
 HV7672                         *CURRENT SURVEY CONTROL
 HV7672  ______________________________________________________________________
 HV7672* NAD 83(1993) POSITION- 38 55 30.86182(N) 076 57 33.42187(W)   ADJUSTED
 HV7672* NAVD 88 ORTHO HEIGHT -    33.    (meters)      108.    (feet) SCALED
 HV7672  ______________________________________________________________________
 HV7672  GEOID HEIGHT    -        -32.161 (meters)                     GEOID18
 HV7672  LAPLACE CORR    -         -4.73  (seconds)                    DEFLEC18
 HV7672  HORZ ORDER      -  SECOND
 HV7672
 HV7672.The horizontal coordinates were established by classical geodetic methods
 HV7672.and adjusted by the National Geodetic Survey in November 1994.
 HV7672
 HV7672.The orthometric height was scaled from a topographic map.
 HV7672
 HV7672.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7672.GEOID18 height accuracy estimate available here.
 HV7672
 HV7672.Click photographs - Photos may exist for this station.
 HV7672
 HV7672.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7672
 HV7672. The following values were computed from the NAD 83(1993) position.
 HV7672
 HV7672;                    North         East     Units Scale Factor Converg.
 HV7672;SPC MD       -   139,707.870   403,530.626   MT  0.99995022   +0 01 32.0
 HV7672;SPC MD       -   458,358.24  1,323,916.73   sFT  0.99995022   +0 01 32.0
 HV7672;SPC VA N     - 2,140,823.058 3,633,595.792   MT  0.99996277   +0 57 41.7
 HV7672;SPC VA N     - 7,023,683.65 11,921,222.19   sFT  0.99996277   +0 57 41.7
 HV7672;UTM  18      - 4,310,305.353   330,156.740   MT  0.99995522   -1 13 52.8
 HV7672
 HV7672!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7672!SPC MD       -   0.99999990  x   0.99995022  =   0.99995012
 HV7672!SPC VA N     -   0.99999990  x   0.99996277  =   0.99996267
 HV7672!UTM  18      -   0.99999990  x   0.99995522  =   0.99995512
 HV7672
 HV7672:                Primary Azimuth Mark                     Grid Az
 HV7672:SPC MD       -  INSANE                                   204 19 20.3
 HV7672:SPC VA N     -  INSANE                                   203 23 10.6
 HV7672:UTM  18      -  INSANE                                   205 34 45.1
 HV7672
 HV7672_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3015610305(NAD 83)
 HV7672
 HV7672|---------------------------------------------------------------------|
 HV7672| PID    Reference Object                     Distance      Geod. Az  |
 HV7672|                                                           dddmmss.s |
 HV7672| HV7710 PEPCO CENTER STK OF THREE STKS      APPROX. 3.1 KM 1801718.2 |
 HV7672| HV4675 INSANE                              APPROX. 8.6 KM 2042052.3 |
 HV7672| HV7567 NAVY YARD EAST WIRELESS MAST        APPROX. 6.6 KM 2083312.2 |
 HV7672| HV7692 COLUMBIA DEAF AND DUMB INST FS      APPROX. 3.8 KM 2350842.2 |
 HV7672| HV4272 GARFIELD HOSP FLAG ON MAIN TWR      APPROX. 5.8 KM 2660958.2 |
 HV7672| HV4365 TRINITY COLLEGE DOME                APPROX. 3.9 KM 2733001.7 |
 HV7672|---------------------------------------------------------------------|
 HV7672
 HV7672                          SUPERSEDED SURVEY CONTROL
 HV7672
 HV7672  NAD 83(1991)-  38 55 30.86101(N)    076 57 33.42242(W) AD(       ) 2
 HV7672  NAD 83(1986)-  38 55 30.86008(N)    076 57 33.43332(W) AD(       ) 2
 HV7672  NAD 27      -  38 55 30.46300(N)    076 57 34.52200(W) AD(       ) 2
 HV7672  USSD        -  38 55 30.79900(N)    076 57 34.35200(W) AD(       ) 3
 HV7672
 HV7672.Superseded values are not recommended for survey control.
 HV7672
 HV7672.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7672.See file dsdata.pdf to determine how the superseded data were derived.
 HV7672
 HV7672
 HV7672  HISTORY     - Date     Condition        Report By
 HV7672  HISTORY     - 1912     MONUMENTED       CGS
 HV7672  HISTORY     - 1917     GOOD             CGS
 HV7672  HISTORY     - 1931     GOOD             CGS
 HV7672  HISTORY     - 1934     GOOD             CGS
 HV7672  HISTORY     - 1939     GOOD             CGS
 HV7672  HISTORY     - 1952     GOOD             CGS
 HV7672  HISTORY     - 1954     MARK NOT FOUND   CGS
 HV7672  HISTORY     - 1958     GOOD             CGS
 HV7672  HISTORY     - 1960     SEE DESCRIPTION  MADHOP
 HV7672  HISTORY     - 20070421 MARK NOT FOUND   GEOCAC
 HV7672
 HV7672                          STATION DESCRIPTION
 HV7672
 HV7672'DESCRIBED BY COAST AND GEODETIC SURVEY 1917
 HV7672'THIS STATION IS THE CENTER OF THE TOP OF THE TOWER ON THE
 HV7672'MAIN OR ADMINISTRATION BUILDING AT THE BOYS TRAINING SCHOOL
 HV7672'JUST E OF THE BLADENSBURG ROAD.  IT IS SOMETIMES CALLED THE
 HV7672'REFORM SCHOOL.  THE CENTER WAS TRANSFERRED FROM THE TIP OF THE
 HV7672'TOWER TO THE PLATFORM BELOW WHICH IS SURROUNDED BY LARGE
 HV7672'PILLARS.  IT WAS MARKED BY A TACK DRIVEN IN THE TIN ROOF OR
 HV7672'PLATFORM, AND IS MIDWAY BETWEEN PILLARS E AND W, AND ABOUT 1/4
 HV7672'INCH S OF THE MIDDLE POINT N AND S BETWEEN PILLARS.
 HV7672'
 HV7672'A REFERENCE MARK, SET IN A GRANITE POST IS JUST NORTH OF THE
 HV7672'CONCRETE WALK LEADING FROM THE TRAINING SCHOOL DOWN TO THE
 HV7672'CAR LINE JUST EAST OF THE POINT WHERE A BRANCH WALK LEADS
 HV7672'OFF TO THE NORTH TOWARD THE OTHER BUILDINGS.
 HV7672
 HV7672                          STATION RECOVERY (1931)
 HV7672
 HV7672'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1931 (HSR)
 HV7672'STATION RECOVERED AS DESCRIBED.
 HV7672
 HV7672                          STATION RECOVERY (1934)
 HV7672
 HV7672'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1934 (JB)
 HV7672'THIS STATION IS LOCATED ON THE PLATFORM UNDER THE CUPOLA ON
 HV7672'THE ADMINISTRATION BUILDING AT THE NATIONAL TRAINING SCHOOL
 HV7672'FOR BOYS.  STATION IS MARKED BY A NAILHEAD IN THE CENTER OF
 HV7672'PLATFORM.  STATION WAS OCCUPIED ECCENTRICALLY IN 1934, AND
 HV7672'IT IS PROBABLE THAT ANY FUTURE OBSERVATIONS WILL HAVE TO BE
 HV7672'MADE FROM SOME ECCENTRIC POINT BECAUSE OF INTERFERENCE FROM
 HV7672'COLUMNS.  THE ORIGINAL DESCRIPTION WAS CHECKED AND FOUND TO BE
 HV7672'CORRECT.  NO NEW MARKS WERE ESTABLISHED.
 HV7672
 HV7672                          STATION RECOVERY (1939)
 HV7672
 HV7672'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV7672'STATION RECOVERED AS DESCRIBED.
 HV7672
 HV7672                          STATION RECOVERY (1952)
 HV7672
 HV7672'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1952 (IWS)
 HV7672'THE STATION WAS RECOVERED AS DESCRIBED.  NO EFFORT MADE TO
 HV7672'RECOVER THE AZIMUTH MARK
 HV7672
 HV7672                          STATION RECOVERY (1954)
 HV7672
 HV7672'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1954 (JAD)
 HV7672'AN UNSTAMPED REFERENCE MARK WAS FOUND IN GRANITE POST FLUSH
 HV7672'WITH THE BRICK LATERAL SECTION OF SIDEWALK LEADING FROM
 HV7672'TRAINING SCHOOL TO BLADENSBURG ROAD.  THE MIDDLE SECTION
 HV7672'OF SIDEWALK IS 4 OR 5 FEET WIDE AND IN 1938, W.P.A. IS REPORTED
 HV7672'TO HAVE BUILT THE BRICK SIDE SECTIONS ABOUT 1 OR 1-1/2 FEET
 HV7672'WIDE.  THE REFERENCE MARK IS IN THE NORTH BRICK SECTION ON
 HV7672'THE SECOND LANDING FROM THE TOP OF THE HILL.
 HV7672'
 HV7672'DISTANCES ON 1931 SKETCH APPEAR TO BE CORRECT.
 HV7672
 HV7672                          STATION RECOVERY (1958)
 HV7672
 HV7672'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1958 (JPR)
 HV7672'THE STATION WAS RECOVERED IN GOOD CONDITION.  THE 1934
 HV7672'DESCRIPTION BY J.B. JR. IS ADEQUATE AND COMPLETE.
 HV7672
 HV7672                          STATION RECOVERY (1960)
 HV7672
 HV7672'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960 (CJM)
 HV7672'STATION MARK WAS NOT RECOVERED AND WAS RESET BY A CROSS CUT
 HV7672'IN TIN ROOF BY MEASURING BETWEEN PILLARS AS DESCRIBED
 HV7672'IN 1917 RECOVERY NOTE.  THE LARGE PILLARS SURROUNDING PLATFORM
 HV7672'MAKE THIS STATION VERY DIFFICULT TO OCCUPY.
 HV7672
 HV7672                          STATION RECOVERY (2007)
 HV7672
 HV7672'RECOVERY NOTE BY GEOCACHING 2007 (APC)
 HV7672'SITE IS NOW LOCATED APPROXIMATELY AT THE TENNIS COURTS OF FORT LINCOLN
 HV7672'NEW TOWN, AN URBAN REDEVELOPMENT PROJECT CONSTRUCTED IN THE 1970S.
 HV7672'BUILDING BELIEVED DEMOLISHED AT THAT TIME OR EARLIER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7673 ***********************************************************************
 HV7673  DESIGNATION -  TRAINING ECC 1934
 HV7673  PID         -  HV7673
 HV7673  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7673  COUNTRY     -  US
 HV7673  USGS QUAD   -  WASHINGTON EAST (2016)
 HV7673
 HV7673                         *CURRENT SURVEY CONTROL
 HV7673  ______________________________________________________________________
 HV7673* NAD 83(1993) POSITION- 38 55 30.87380(N) 076 57 33.43864(W)   ADJUSTED
 HV7673* NAVD 88 ORTHO HEIGHT -    33.    (meters)      108.    (feet) SCALED
 HV7673  ______________________________________________________________________
 HV7673  GEOID HEIGHT    -        -32.161 (meters)                     GEOID18
 HV7673  LAPLACE CORR    -         -4.73  (seconds)                    DEFLEC18
 HV7673  HORZ ORDER      -  FIRST
 HV7673
 HV7673.The horizontal coordinates were established by classical geodetic methods
 HV7673.and adjusted by the National Geodetic Survey in November 1994.
 HV7673
 HV7673.The orthometric height was scaled from a topographic map.
 HV7673
 HV7673.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7673.GEOID18 height accuracy estimate available here.
 HV7673
 HV7673.Click photographs - Photos may exist for this station.
 HV7673
 HV7673.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV7673
 HV7673. The following values were computed from the NAD 83(1993) position.
 HV7673
 HV7673;                    North         East     Units Scale Factor Converg.
 HV7673;SPC MD       -   139,708.239   403,530.222   MT  0.99995022   +0 01 32.0
 HV7673;SPC MD       -   458,359.45  1,323,915.40   sFT  0.99995022   +0 01 32.0
 HV7673;SPC VA N     - 2,140,823.421 3,633,595.382   MT  0.99996277   +0 57 41.7
 HV7673;SPC VA N     - 7,023,684.84 11,921,220.85   sFT  0.99996277   +0 57 41.7
 HV7673;UTM  18      - 4,310,305.731   330,156.344   MT  0.99995522   -1 13 52.8
 HV7673
 HV7673!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV7673!SPC MD       -   0.99999990  x   0.99995022  =   0.99995012
 HV7673!SPC VA N     -   0.99999990  x   0.99996277  =   0.99996267
 HV7673!UTM  18      -   0.99999990  x   0.99995522  =   0.99995512
 HV7673
 HV7673:                Primary Azimuth Mark                     Grid Az
 HV7673:SPC MD       -  DUPONT                                   164 12 58.8
 HV7673:SPC VA N     -  DUPONT                                   163 16 49.1
 HV7673:UTM  18      -  DUPONT                                   165 28 23.6
 HV7673
 HV7673_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ3015610305(NAD 83)
 HV7673
 HV7673|---------------------------------------------------------------------|
 HV7673| PID    Reference Object                     Distance      Geod. Az  |
 HV7673|                                                           dddmmss.s |
 HV7673| HV7672 TRAINING 1912                         0.547 METERS 13227     |
 HV7673| HV7581 DUPONT                              APPROX. 6.1 KM 1641430.8 |
 HV7673| HV7683 MONASTERY FINIAL ON DOME            APPROX. 2.6 KM 3011002.2 |
 HV7673|---------------------------------------------------------------------|
 HV7673
 HV7673                          SUPERSEDED SURVEY CONTROL
 HV7673
 HV7673  NAD 83(1991)-  38 55 30.87298(N)    076 57 33.43917(W) AD(       ) 1
 HV7673  NAD 83(1986)-  38 55 30.87204(N)    076 57 33.45007(W) AD(       ) 1
 HV7673  NAD 27      -  38 55 30.47500(N)    076 57 34.53900(W) AD(       ) 1
 HV7673
 HV7673.Superseded values are not recommended for survey control.
 HV7673
 HV7673.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7673.See file dsdata.pdf to determine how the superseded data were derived.
 HV7673
 HV7673_MARKER: Z = SEE DESCRIPTION
 HV7673_SETTING: 0 = UNSPECIFIED SETTING
 HV7673_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7673
 HV7673  HISTORY     - Date     Condition        Report By
 HV7673  HISTORY     - 1934     MONUMENTED       CGS
 HV7673  HISTORY     - 20070421 MARK NOT FOUND   GEOCAC
 HV7673
 HV7673                          STATION DESCRIPTION
 HV7673
 HV7673'DESCRIBED BY COAST AND GEODETIC SURVEY 1934
 HV7673'THE STATION WAS MARKED BY A TACK DRIVEN IN THE TIN ROOF OR
 HV7673'PLATFORM, AND IS MIDWAY BETWEEN PILLARS E AND W, AND ABOUT 1/4
 HV7673'INCH S OF THE MIDDLE POINT N AND S BETWEEN PILLARS.
 HV7673
 HV7673                          STATION RECOVERY (2007)
 HV7673
 HV7673'RECOVERY NOTE BY GEOCACHING 2007 (APC)
 HV7673'SITE IS NOW LOCATED APPROXIMATELY AT THE TENNIS COURTS OF FORT LINCOLN
 HV7673'NEW TOWN, AN URBAN REDEVELOPMENT PROJECT CONSTRUCTED IN THE 1970S.
 HV7673'BUILDING BELIEVED DEMOLISHED AT THAT TIME OR EARLIER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1840 ***********************************************************************
 HV1840  DESIGNATION -  TRAVERSE STATION PBPP
 HV1840  PID         -  HV1840
 HV1840  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1840  COUNTRY     -  US
 HV1840  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1840
 HV1840                         *CURRENT SURVEY CONTROL
 HV1840  ______________________________________________________________________
 HV1840* NAD 83(1986) POSITION- 38 53 31.     (N) 077 02 12.     (W)   SCALED
 HV1840* NAVD 88 ORTHO HEIGHT -     2.138 (meters)        7.01  (feet) ADJUSTED
 HV1840  ______________________________________________________________________
 HV1840  GEOID HEIGHT    -        -32.082 (meters)                     GEOID18
 HV1840  DYNAMIC HEIGHT  -          2.136 (meters)        7.01  (feet) COMP
 HV1840  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 HV1840
 HV1840  VERT ORDER      -  FIRST     CLASS II
 HV1840
 HV1840.The horizontal coordinates were scaled from a map and have
 HV1840.an estimated accuracy of +/- 6 seconds.
 HV1840
 HV1840.The orthometric height was determined by differential leveling and
 HV1840.adjusted by the NATIONAL GEODETIC SURVEY
 HV1840.in June 1991.
 HV1840
 HV1840.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1840.GEOID18 height accuracy estimate available here.
 HV1840
 HV1840.Click photographs - Photos may exist for this station.
 HV1840
 HV1840.The dynamic height is computed by dividing the NAVD 88
 HV1840.geopotential number by the normal gravity value computed on the
 HV1840.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1840.degrees latitude (g = 980.6199 gals.).
 HV1840
 HV1840.The modeled gravity was interpolated from observed gravity values.
 HV1840
 HV1840
 HV1840_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ233067(NAD 83)
 HV1840
 HV1840                          SUPERSEDED SURVEY CONTROL
 HV1840
 HV1840  NGVD 29 (11/26/84)    2.373  (m)            7.79   (f) ADJUSTED    1 2
 HV1840
 HV1840.Superseded values are not recommended for survey control.
 HV1840
 HV1840.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1840.See file dsdata.pdf to determine how the superseded data were derived.
 HV1840
 HV1840_MARKER: DE = TRAVERSE STATION DISK
 HV1840_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1840_SP_SET: SIDEWALK
 HV1840_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1840
 HV1840  HISTORY     - Date     Condition        Report By
 HV1840  HISTORY     - UNK      MONUMENTED       PBPP
 HV1840  HISTORY     - 1956     GOOD             CGS
 HV1840  HISTORY     - 20040612 MARK NOT FOUND   NGS
 HV1840
 HV1840                          STATION DESCRIPTION
 HV1840
 HV1840'DESCRIBED BY COAST AND GEODETIC SURVEY 1956
 HV1840'AT WASHINGTON.
 HV1840'AT WASHINGTON, D.C., IN THE SIDEWALK ON THE S SIDE OF CONSTITUTION
 HV1840'AVENUE, AT THE NW CORNER OF THE MONUMENT GROUNDS, 64 FT E OF THE
 HV1840'E CURB OF 16TH STREET EXTENDED, 10 INCHES S OF THE N EDGE OF THE
 HV1840'SIDEWALK.
 HV1840
 HV1840                          STATION RECOVERY (2004)
 HV1840
 HV1840'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2004 (DW)
 HV1840'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4365 ***********************************************************************
 HV4365  DESIGNATION -  TRINITY COLLEGE DOME
 HV4365  PID         -  HV4365
 HV4365  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4365  COUNTRY     -  US
 HV4365  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4365
 HV4365                         *CURRENT SURVEY CONTROL
 HV4365  ______________________________________________________________________
 HV4365* NAD 83(1993) POSITION- 38 55 38.57091(N) 077 00 15.41532(W)   ADJUSTED
 HV4365  ______________________________________________________________________
 HV4365  GEOID HEIGHT    -        -32.060 (meters)                     GEOID18
 HV4365  LAPLACE CORR    -         -3.24  (seconds)                    DEFLEC18
 HV4365  HORZ ORDER      -  THIRD
 HV4365
 HV4365.The horizontal coordinates were established by classical geodetic methods
 HV4365.and adjusted by the National Geodetic Survey in November 1994.
 HV4365
 HV4365.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4365.GEOID18 height accuracy estimate available here.
 HV4365
 HV4365.Click photographs - Photos may exist for this station.
 HV4365
 HV4365.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4365
 HV4365. The following values were computed from the NAD 83(1993) position.
 HV4365
 HV4365;                    North         East     Units Scale Factor Converg.
 HV4365;SPC MD       -   139,944.807   399,628.702   MT  0.99995025   -0 00 09.7
 HV4365;SPC MD       -   459,135.59  1,311,115.17   sFT  0.99995025   -0 00 09.7
 HV4365;SPC VA N     - 2,140,996.218 3,629,690.468   MT  0.99996297   +0 56 00.6
 HV4365;SPC VA N     - 7,024,251.76 11,908,409.48   sFT  0.99996297   +0 56 00.6
 HV4365;UTM  18      - 4,310,627.829   326,260.901   MT  0.99997170   -1 15 34.8
 HV4365
 HV4365_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2626010627(NAD 83)
 HV4365
 HV4365                          SUPERSEDED SURVEY CONTROL
 HV4365
 HV4365  NAD 83(1991)-  38 55 38.57007(N)    077 00 15.41617(W) AD(       ) 3
 HV4365  NAD 83(1986)-  38 55 38.56933(N)    077 00 15.42670(W) AD(       ) 3
 HV4365  NAD 27      -  38 55 38.17200(N)    077 00 16.50900(W) AD(       ) 3
 HV4365  USSD        -  38 55 38.50800(N)    077 00 16.33900(W) AD(       ) 3
 HV4365
 HV4365.Superseded values are not recommended for survey control.
 HV4365
 HV4365.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4365.See file dsdata.pdf to determine how the superseded data were derived.
 HV4365
 HV4365_MARKER: 87 = DOME
 HV4365_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4365+SATELLITE: SATELLITE OBSERVATIONS - March 19, 2009
 HV4365
 HV4365  HISTORY     - Date     Condition        Report By
 HV4365  HISTORY     - 1913     FIRST OBSERVED   CGS
 HV4365  HISTORY     - 1939     GOOD             CGS
 HV4365  HISTORY     - 1961     GOOD             CGS
 HV4365  HISTORY     - 1971     GOOD             NGS
 HV4365  HISTORY     - 20030626 GOOD             GEOCAC
 HV4365  HISTORY     - 20090319 GOOD             GEOCAC
 HV4365
 HV4365                          STATION DESCRIPTION
 HV4365
 HV4365'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4365'STATION IS TIP OF THE LARGE DOME (NOT SPHERICAL) ON THE NEW
 HV4365'BUILDING OF CATHOLIC UNIVERSITY JUST E OF N CAPITOL STREET,
 HV4365'AND OPPOSITE THE S END OF SOLDIERS HOME GROUNDS.  THIS IS
 HV4365'TRINITY COLLEGE.
 HV4365
 HV4365                          STATION RECOVERY (1939)
 HV4365
 HV4365'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4365'STATION RECOVERED, TOP OF THE LARGE DOME OF THE MAIN BUILDING OF
 HV4365'TRINITY COLLEGE, LOCATED ON THE S SIDE OF MICHIGAN AVENUE,
 HV4365'BETWEEN N CAPITOL AND 4TH STREET, NE.  THE DOME IS SURMOUNTED BY
 HV4365'A GOLD CROSS.  BUILDING IS OF GRAY STONE AND THE DOME, WHICH
 HV4365'IS IN THE SHAPE OF A TRUNCATED ELLIPSOID, IS RED.  SHOULD NOT
 HV4365'BE CONFUSED WITH THE NEW CHAPEL BUILDING WHICH IS A HUNDRED
 HV4365'YARDS OR SO TO THE N WHICH ALSO HAS A DOME, BUT A SMALLER AND
 HV4365'SHORTER ONE.
 HV4365
 HV4365                          STATION RECOVERY (1961)
 HV4365
 HV4365'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1961 (JPP)
 HV4365'THE STATION WAS RECOVERED AS DESCRIBED.
 HV4365
 HV4365                          STATION RECOVERY (1971)
 HV4365
 HV4365'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4365'STATION WAS RECOVERED AS PREVIOUSLY DESCRIBED, HOWEVER IT IS
 HV4365'LOCATED BETWEEN FRANKLIN ST. N.E. AND IRVING ST. N.E., ALONG THE
 HV4365'SOUTH SIDE OF MICHIGAN AVE.
 HV4365'
 HV4365'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN DISTRICT OF
 HV4365'COLUMBIA
 HV4365
 HV4365                          STATION RECOVERY (2003)
 HV4365
 HV4365'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV4365'AS THE 1939 RECOVERY NOTE POINTS OUT, THERE ARE TWO ADJACENT DOMED
 HV4365'BUILDINGS AT THE TRINITY COLLEGE CAMPUS. THE STATION IS THE DOME ATOP
 HV4365'THE GRAY, ROUGH STONE STRUCTURE THAT APPEARS TO BE A CLASSROOM OR
 HV4365'ADMINISTRATION BUILDING. THE DOME IS MOSTLY COVERED IN RED TILE. IT IS
 HV4365'-NOT- THE ROUND DOME ON THE CHAPEL BUILDING TO THE NORTHEAST.
 HV4365
 HV4365                          STATION RECOVERY (2009)
 HV4365
 HV4365'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV4365'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4696 ***********************************************************************
 HV4696  DESIGNATION -  U 1913
 HV4696  PID         -  HV4696
 HV4696  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4696  COUNTRY     -  US
 HV4696  USGS QUAD   -  ALEXANDRIA (2019)
 HV4696
 HV4696                         *CURRENT SURVEY CONTROL
 HV4696  ______________________________________________________________________
 HV4696* NAD 83(1993) POSITION- 38 52 01.48101(N) 077 02 12.32614(W)   ADJUSTED
 HV4696* NAVD 88 ORTHO HEIGHT -    -0.    (meters)       -0.    (feet) SCALED
 HV4696  ______________________________________________________________________
 HV4696  GEOID HEIGHT    -        -32.127 (meters)                     GEOID18
 HV4696  LAPLACE CORR    -         -2.90  (seconds)                    DEFLEC18
 HV4696  HORZ ORDER      -  THIRD
 HV4696
 HV4696.The horizontal coordinates were established by classical geodetic methods
 HV4696.and adjusted by the National Geodetic Survey in November 1994.
 HV4696
 HV4696.The orthometric height was scaled from a topographic map.
 HV4696
 HV4696.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4696.GEOID18 height accuracy estimate available here.
 HV4696
 HV4696.Click photographs - Photos may exist for this station.
 HV4696
 HV4696.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4696
 HV4696. The following values were computed from the NAD 83(1993) position.
 HV4696
 HV4696;                    North         East     Units Scale Factor Converg.
 HV4696;SPC MD       -   133,251.355   396,810.062   MT  0.99994986   -0 01 23.1
 HV4696;SPC MD       -   437,175.49  1,301,867.68   sFT  0.99994986   -0 01 23.1
 HV4696;SPC VA N     - 2,134,257.533 3,626,981.546   MT  0.99995785   +0 54 47.6
 HV4696;SPC VA N     - 7,002,143.26 11,899,521.96   sFT  0.99995785   +0 54 47.6
 HV4696;UTM  18      - 4,303,997.591   323,296.116   MT  0.99998450   -1 16 42.3
 HV4696
 HV4696!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4696!SPC MD       -   1.00000508  x   0.99994986  =   0.99995494
 HV4696!SPC VA N     -   1.00000508  x   0.99995785  =   0.99996293
 HV4696!UTM  18      -   1.00000508  x   0.99998450  =   0.99998958
 HV4696
 HV4696:                Primary Azimuth Mark                     Grid Az
 HV4696:SPC MD       -  ST ELIZABETHS ASYLUM RED STK             117 52 39.7
 HV4696:SPC VA N     -  ST ELIZABETHS ASYLUM RED STK             116 56 29.0
 HV4696:UTM  18      -  ST ELIZABETHS ASYLUM RED STK             119 07 58.9
 HV4696
 HV4696_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2329603997(NAD 83)
 HV4696
 HV4696|---------------------------------------------------------------------|
 HV4696| PID    Reference Object                     Distance      Geod. Az  |
 HV4696|                                                           dddmmss.s |
 HV4696| HV4712 THEODORE ROOSEVELT HALL FLGSTF      APPROX. 1.8 KM 1035226.0 |
 HV4696| HV4726 ST ELIZABETHS ASYLUM RED STK        APPROX. 3.6 KM 1175116.6 |
 HV4696| HV4710 RED STANDPIPE                       APPROX. 2.8 KM 1472112.8 |
 HV4696| HV4589 IRON CAP STACK                      APPROX. 2.3 KM 1861444.1 |
 HV4696| HV4610 SIGNAL TOWER                        APPROX. 0.6 KM 2945638.0 |
 HV4696|---------------------------------------------------------------------|
 HV4696
 HV4696                          SUPERSEDED SURVEY CONTROL
 HV4696
 HV4696  NAD 83(1991)-  38 52 01.47961(N)    077 02 12.32756(W) AD(       ) 3
 HV4696  NAD 83(1986)-  38 52 01.47937(N)    077 02 12.33843(W) AD(       ) 3
 HV4696  NAD 27      -  38 52 01.07900(N)    077 02 13.41500(W) AD(       ) 3
 HV4696  USSD        -  38 52 01.41600(N)    077 02 13.24500(W) AD(       ) 3
 HV4696
 HV4696.Superseded values are not recommended for survey control.
 HV4696
 HV4696.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4696.See file dsdata.pdf to determine how the superseded data were derived.
 HV4696
 HV4696_MARKER: Z = SEE DESCRIPTION
 HV4696_SETTING: 0 = UNSPECIFIED SETTING
 HV4696_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4696
 HV4696  HISTORY     - Date     Condition        Report By
 HV4696  HISTORY     - 1913     MONUMENTED       CGS
 HV4696  HISTORY     - 1922     GOOD             CGS
 HV4696  HISTORY     - 1924     POOR             CGS
 HV4696  HISTORY     - 1939     MARK NOT FOUND   CGS
 HV4696
 HV4696                          STATION DESCRIPTION
 HV4696
 HV4696'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4696'STATION IS A CONCRETE MONUMENT, 8-INCH TERRA COTTA PIPE, CENTERED
 HV4696'WITH 1/4-INCH BRASS PIPE, 0.5 FOOT ABOVE GROUND, 12 FEET BACK
 HV4696'N HIGH-WATER LINE, 14.5 FEET SW OF 6-INCH WILLOW (FORKS),
 HV4696'33 FEET N OF 8-INCH AND 12-INCH DOUBLE FORKED WATER MAPLE.
 HV4696
 HV4696                          STATION RECOVERY (1922)
 HV4696
 HV4696'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1922 (HPO)
 HV4696'STATION MARK WAS FOUND IN GOOD CONDITION, BUT THE TERRA COTTA
 HV4696'PIPE IS NOW TWO METERS OUTSIDE THE HIGH-WATER MARK.  THE
 HV4696'STATION IS ABOUT 18 METERS NE OF THE NE CORNER OF A FISHERMANS
 HV4696'SHACK ON THE POINT.
 HV4696'
 HV4696'A REFERENCE MARK, CONSISTING OF A STANDARD BRASS DISK IN A
 HV4696'BLOCK OF CONCRETE, 12 BY 12 INCHES, BY 3 FEET, WAS ESTABLISHED.
 HV4696'THE REFERENCE MARK IS 2 METERS N OF A 4-FORKED WILLOW TREE.
 HV4696'A TRIANGULAR BLAZE WAS CUT IN THE LIMB NE OF THE REFERENCE
 HV4696'MARK.  THE BLAZE IS 3 FEET ABOVE THE GROUND.  REFERENCE MARK
 HV4696'IS 44.192 METERS (144.95 FEET) FROM STATION ON LINE 114 DEG
 HV4696'59 MIN 05.0 SEC TO RIGHT OF POTOMAC S.E. BASE.
 HV4696
 HV4696                          STATION RECOVERY (1924)
 HV4696
 HV4696'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1924 (EWE)
 HV4696'RECOVERED AND DESCRIBED, EXCEPT THAT THE MARK LEANS OUT TOWARD
 HV4696'THE RIVER AND HAS PROBABLY SHIFTED A CERTAIN EXTENT.
 HV4696
 HV4696                          STATION RECOVERY (1939)
 HV4696
 HV4696'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4696'STATION LOST.  ENTIRE POINT DREDGED AWAY.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI7403 ***********************************************************************
 AI7403  CORS        -  This is a GPS Continuously Operating Reference Station.
 AI7403  DESIGNATION -  U.S. NAVAL OBSERV CORS ARP
 AI7403  CORS_ID     -  USNO
 AI7403  PID         -  AI7403
 AI7403  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI7403  COUNTRY     -  US
 AI7403  USGS QUAD   -  WASHINGTON WEST (2016)
 AI7403
 AI7403                         *CURRENT SURVEY CONTROL
 AI7403  ______________________________________________________________________
 AI7403* NAD 83(2011) POSITION- 38 55 08.23640(N) 077 03 58.39621(W)   ADJUSTED
 AI7403* NAD 83(2011) ELLIP HT-    50.152 (meters)        (12/??/25)   ADJUSTED
 AI7403* NAD 83(2011) EPOCH   -  2010.00
 AI7403  ______________________________________________________________________
 AI7403  GEOID HEIGHT    -        -31.994 (meters)                     GEOID18
 AI7403  NAD 83(2011) X  -  1,112,190.452 (meters)                     COMP
 AI7403  NAD 83(2011) Y  - -4,842,956.483 (meters)                     COMP
 AI7403  NAD 83(2011) Z  -  3,985,352.361 (meters)                     COMP
 AI7403
 AI7403.Formal positional accuracy estimates are not available for this CORS
 AI7403.because its coordinates were determined in part using modeled velocities.
 AI7403.A time-series residual plot is available that shows daily coordinate
 AI7403.variations relative to the published coordinates and modeled velocities.
 AI7403.Large residuals may indicate a potential error in the modeled velocities.
 AI7403
 AI7403.Residual plot at:
 AI7403.https://geodesy.noaa.gov/CORS/ncn_station_pages/index.html?stationID=USNO.
 AI7403
 AI7403.The coordinates were established by GPS observations
 AI7403.and adjusted by the National Geodetic Survey in December 2025.
 AI7403
 AI7403.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AI7403.been affixed to the stable North American Tectonic Plate. 
 AI7403
 AI7403.The coordinates are valid at the epoch date displayed above
 AI7403.which is a decimal equivalence of Year/Month/Day.
 AI7403
 AI7403.NGS completed the third reprocessing of daily RINEX data from 1996 to 2022
 AI7403.for all stations in the NOAA CORS Network (NCN).  The reprocessed solution,
 AI7403.known as the Multi-Year CORS Solution 3 (MYCS3), is aligned with the
 AI7403.ITFR2020 global frame, epoch 2020.00.  The resulting MYCS3 coordinates
 AI7403.were then transformed to NAD83(2011/MA11/PA11), maintaining the currently
 AI7403.published epoch of 2010.00.
 AI7403
 AI7403.Additional information on MYCS is available at:
 AI7403.https://geodesy.noaa.gov/CORS/index.shtml
 AI7403
 AI7403.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI7403.GEOID18 height accuracy estimate available here.
 AI7403
 AI7403.The PID for the CORS L1 Phase Center is AI7440.
 AI7403
 AI7403.Click photographs - Photos may exist for this station.
 AI7403
 AI7403.The XYZ, and position/ellipsoidal ht. are equivalent.
 AI7403
 AI7403.The ellipsoidal height was determined by GPS observations
 AI7403.and is referenced to NAD 83.
 AI7403
 AI7403. The following values were computed from the NAD 83(2011) position.
 AI7403
 AI7403;                    North         East     Units Scale Factor Converg.
 AI7403;UTM  18      - 4,309,812.540   320,870.086   MT  0.99999513   -1 17 54.2
 AI7403
 AI7403!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AI7403!UTM  18      -   0.99999213  x   0.99999513  =   0.99998726
 AI7403
 AI7403_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2087009812(NAD 83)
 AI7403
 AI7403                          SUPERSEDED SURVEY CONTROL
 AI7403
 AI7403  NAD 83(2011)-  38 55 08.23634(N)    077 03 58.39621(W) AD(2010.00) c
 AI7403  ELLIP H (04/??/25)   50.152  (m)                       GP(2010.00) c c
 AI7403  NAD 83(2011)-  38 55 08.23642(N)    077 03 58.39618(W) AD(2010.00) c
 AI7403  ELLIP H (05/??/20)   50.152  (m)                       GP(2010.00) c c
 AI7403  NAD 83(2011)-  38 55 08.23643(N)    077 03 58.39618(W) AD(2010.00) c
 AI7403  ELLIP H (06/??/19)   50.151  (m)                       GP(2010.00) c c
 AI7403  NAD 83(2011)-  38 55 08.23647(N)    077 03 58.39606(W) AD(2010.00) c
 AI7403  NAD 83(2011)-  38 55 08.23647(N)    077 03 58.39613(W) AD(2010.00) c
 AI7403  ELLIP H (08/??/11)   50.151  (m)                       GP(2010.00) c c
 AI7403  NAD 83(2007)-  38 55 08.23669(N)    077 03 58.39673(W) AD(2002.00) c
 AI7403  NAD 83(CORS)-  38 55 08.23669(N)    077 03 58.39673(W) AD(2002.00) c
 AI7403  ELLIP H (03/??/02)   50.172  (m)                       GP(2002.00) c c
 AI7403  NAD 83(CORS)-  38 55 08.23678(N)    077 03 58.39707(W) AD(1997.00) c
 AI7403  ELLIP H (07/??/00)   50.177  (m)                       GP(1997.00) c c
 AI7403
 AI7403.Superseded values are not recommended for survey control.
 AI7403
 AI7403.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AI7403.See file dsdata.pdf to determine how the superseded data were derived.
 AI7403
 AI7403_MARKER: STATION IS THE ANTENNA REFERENCE POINT OF THE GPS ANTENNA
 AI7403
 AI7403                          STATION DESCRIPTION
 AI7403
 AI7403'DESCRIBED BY NATIONAL GEODETIC SURVEY 2025
 AI7403'THIS STATION IS PART OF THE NOAA CORS NETWORK (NCN).  LATEST INFORMATION
 AI7403'INCLUDING POSITIONS AND VELOCITIES ARE AVAILABLE IN THE COORDINATE
 AI7403'AND LOG FILES ACCESSIBLE AT:
 AI7403'https://geodesy.noaa.gov/CORS/index.shtml
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV9835 ***********************************************************************
 HV9835  DESIGNATION -  UNGER GPS COL 5R E 14A
 HV9835  PID         -  HV9835
 HV9835  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV9835  COUNTRY     -  US
 HV9835  USGS QUAD   -  WASHINGTON WEST (2016)
 HV9835
 HV9835                         *CURRENT SURVEY CONTROL
 HV9835  ______________________________________________________________________
 HV9835* NAD 83(2011) POSITION- 38 55 52.22446(N) 077 01 47.80687(W)   ADJUSTED
 HV9835* NAD 83(2011) ELLIP HT-    26.139 (meters)        (06/27/12)   ADJUSTED
 HV9835* NAD 83(2011) EPOCH   -  2010.00
 HV9835* NAVD 88 ORTHO HEIGHT -    58.2   (meters)      191.    (feet) VERTCON3
 HV9835  ______________________________________________________________________
 HV9835  GEOID HEIGHT    -        -32.020 (meters)                     GEOID18
 HV9835  NAD 83(2011) X  -  1,115,060.897 (meters)                     COMP
 HV9835  NAD 83(2011) Y  - -4,841,402.627 (meters)                     COMP
 HV9835  NAD 83(2011) Z  -  3,986,392.571 (meters)                     COMP
 HV9835  LAPLACE CORR    -         -1.85  (seconds)                    DEFLEC18
 HV9835
 HV9835  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV9835  Standards:
 HV9835         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV9835            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV9835  -------------------------------------------------------------------
 HV9835  NETWORK    1.02   1.82           0.45   0.38   0.93      0.10849100
 HV9835  -------------------------------------------------------------------
 HV9835  Click here for local accuracies and other accuracy information.
 HV9835
 HV9835.The horizontal coordinates were established by GPS observations
 HV9835.and adjusted by the National Geodetic Survey in June 2012.
 HV9835
 HV9835.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV9835.been affixed to the stable North American tectonic plate. See 
 HV9835.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV9835
 HV9835.The horizontal coordinates are valid at the epoch date displayed above
 HV9835.which is a decimal equivalence of Year/Month/Day.
 HV9835
 HV9835.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV9835.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV9835
 HV9835.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV9835.GEOID18 height accuracy estimate available here.
 HV9835
 HV9835.Click photographs - Photos may exist for this station.
 HV9835
 HV9835.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV9835
 HV9835.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV9835
 HV9835.The ellipsoidal height was determined by GPS observations
 HV9835.and is referenced to NAD 83.
 HV9835
 HV9835. The following values were computed from the NAD 83(2011) position.
 HV9835
 HV9835;                    North         East     Units Scale Factor Converg.
 HV9835;SPC MD       -   140,366.241   397,403.473   MT  0.99995031   -0 01 07.7
 HV9835;SPC MD       -   460,518.24  1,303,814.56   sFT  0.99995031   -0 01 07.7
 HV9835;SPC VA N     - 2,141,381.241 3,627,458.621   MT  0.99996333   +0 55 03.0
 HV9835;SPC VA N     - 7,025,514.95 11,901,087.16   sFT  0.99996333   +0 55 03.0
 HV9835;UTM  18      - 4,311,097.991   324,045.395   MT  0.99998124   -1 16 33.3
 HV9835
 HV9835!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV9835!SPC MD       -   0.99999590  x   0.99995031  =   0.99994621
 HV9835!SPC VA N     -   0.99999590  x   0.99996333  =   0.99995923
 HV9835!UTM  18      -   0.99999590  x   0.99998124  =   0.99997714
 HV9835
 HV9835_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2404511097(NAD 83)
 HV9835
 HV9835|---------------------------------------------------------------------|
 HV9835| PID    Reference Object                     Distance      Geod. Az  |
 HV9835|                                                           dddmmss.s |
 HV9835| HV9831 FALKEN III GPS E 14                 255.569 METERS 25013     |
 HV9835|---------------------------------------------------------------------|
 HV9835
 HV9835                          SUPERSEDED SURVEY CONTROL
 HV9835
 HV9835  NAD 83(2007)-  38 55 52.22509(N)    077 01 47.80768(W) AD(2002.00) 0
 HV9835  ELLIP H (02/10/07)   26.151  (m)                       GP(2002.00)    
 HV9835  ELLIP H (08/30/02)   26.146  (m)                       GP(       ) 4 2
 HV9835  NAD 83(1993)-  38 55 52.22553(N)    077 01 47.80747(W) AD(       ) 1
 HV9835  ELLIP H (11/14/94)   26.140  (m)                       GP(       ) 4 2
 HV9835  NAD 83(1991)-  38 55 52.22494(N)    077 01 47.80751(W) AD(       ) 1
 HV9835  NGVD 29 (11/30/93)   58.4    (m)  GEOID93  model used  GPS OBS        
 HV9835
 HV9835.Superseded values are not recommended for survey control.
 HV9835
 HV9835.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV9835.See file dsdata.pdf to determine how the superseded data were derived.
 HV9835
 HV9835_MARKER: DD = SURVEY DISK
 HV9835_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV9835_SP_SET: FLUSH IN SIDEWALK
 HV9835_STAMPING: UNGER GPS COL5R
 HV9835_MARK LOGO: DEWDAV
 HV9835_MAGNETIC: O = OTHER; SEE DESCRIPTION
 HV9835_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV9835_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV9835+SATELLITE: SATELLITE OBSERVATIONS - 1992
 HV9835
 HV9835  HISTORY     - Date     Condition        Report By
 HV9835  HISTORY     - 1992     MONUMENTED       DEWDAV
 HV9835
 HV9835                          STATION DESCRIPTION
 HV9835
 HV9835'DESCRIBED BY DEWBERRY DAVIS 1992
 HV9835'STATION IS LOCATED IN DOWNTOWN WASHINGTON, DISTRICT OF COLUMBIA.
 HV9835'TO REACH STATION PROCEED TO INTERSECTION OF 13TH STREET NORTHWEST AND
 HV9835'PARK ROAD. STATION IS STANDARD 2.5 INCH DIAMETER METRO DISK SET FLUSH
 HV9835'IN SIDEWALK IN SOUTHWEST QUADRANT OF SAID INTERSECTION.
 HV9835'STATION IS 432.876 FT (131.941 M) SOUTHWEST OF REFERENCE DISK B,
 HV9835'192.902 FT (58.797 M) SOUTHWEST OF REFERENCE DISK A, 131.795 FT
 HV9835'(40.171 M) NORTHWEST OF REFERENCE POINT C, 294.457 FT (89.751 M)
 HV9835'NORTHWEST OF REFERENCE DISK D, NORTH 70-14-15 EAST 838.486 FT
 HV9835'(255.571 M) FROM METRO CONTROL STATION FALKEN III GPS, SOUTH 66-09-05
 HV9835'WEST 729.245 FT (222.274 M) FROM METRO CONTROL POINT COL 4-R AND
 HV9835'NORTH 66-03-15 EAST 554.578 FT (169.036 M) FROM METRO CONTROL POINT
 HV9835'PARK NO. 2.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4439 ***********************************************************************
 HV4439  DESIGNATION -  UNITY
 HV4439  PID         -  HV4439
 HV4439  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4439  COUNTRY     -  US
 HV4439  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4439
 HV4439                         *CURRENT SURVEY CONTROL
 HV4439  ______________________________________________________________________
 HV4439* NAD 83(1993) POSITION- 38 55 33.59127(N) 077 02 10.04903(W)   ADJUSTED
 HV4439  ______________________________________________________________________
 HV4439  GEOID HEIGHT    -        -32.021 (meters)                     GEOID18
 HV4439  LAPLACE CORR    -         -1.88  (seconds)                    DEFLEC18
 HV4439  HORZ ORDER      -  THIRD
 HV4439
 HV4439.The horizontal coordinates were established by classical geodetic methods
 HV4439.and adjusted by the National Geodetic Survey in November 1994.
 HV4439
 HV4439.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4439.GEOID18 height accuracy estimate available here.
 HV4439
 HV4439.Click photographs - Photos may exist for this station.
 HV4439
 HV4439.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4439
 HV4439. The following values were computed from the NAD 83(1993) position.
 HV4439
 HV4439;                    North         East     Units Scale Factor Converg.
 HV4439;SPC MD       -   139,791.867   396,867.543   MT  0.99995023   -0 01 21.6
 HV4439;SPC MD       -   458,633.82  1,302,056.26   sFT  0.99995023   -0 01 21.6
 HV4439;SPC VA N     - 2,140,798.179 3,626,932.142   MT  0.99996284   +0 54 49.1
 HV4439;SPC VA N     - 7,023,602.03 11,899,359.87   sFT  0.99996284   +0 54 49.1
 HV4439;UTM  18      - 4,310,535.494   323,496.976   MT  0.99998362   -1 16 46.8
 HV4439
 HV4439_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2349610535(NAD 83)
 HV4439
 HV4439                          SUPERSEDED SURVEY CONTROL
 HV4439
 HV4439  NAD 83(1991)-  38 55 33.59038(N)    077 02 10.05005(W) AD(       ) 3
 HV4439  NAD 83(1986)-  38 55 33.58989(N)    077 02 10.06042(W) AD(       ) 3
 HV4439  NAD 27      -  38 55 33.19100(N)    077 02 11.13900(W) AD(       ) 3
 HV4439
 HV4439.Superseded values are not recommended for survey control.
 HV4439
 HV4439.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4439.See file dsdata.pdf to determine how the superseded data were derived.
 HV4439
 HV4439_MARKER: 82 = FINIAL
 HV4439_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4439+SATELLITE: SATELLITE OBSERVATIONS - March 15, 2012
 HV4439
 HV4439  HISTORY     - Date     Condition        Report By
 HV4439  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4439  HISTORY     - 1961     GOOD             CGS
 HV4439  HISTORY     - 20090316 GOOD             GEOCAC
 HV4439  HISTORY     - 20120315 GOOD             GEOCAC
 HV4439
 HV4439                          STATION DESCRIPTION
 HV4439
 HV4439'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4439'STATION IS CENTER OF FINIAL ON SPIRE OF ALL SOULS UNITARIAN CHURCH,
 HV4439'LOCATED ON THE SOUTHEAST CORNER OF INTERSECTION OF 16TH AND
 HV4439'HARVARD STREETS, N.W.
 HV4439
 HV4439                          STATION RECOVERY (1961)
 HV4439
 HV4439'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1961 (JPP)
 HV4439'THIS STATION RECOVERED AS DESCRIBED.
 HV4439
 HV4439                          STATION RECOVERY (2009)
 HV4439
 HV4439'RECOVERY NOTE BY GEOCACHING 2009
 HV4439'RECOVERED IN GOOD CONDITION.
 HV4439
 HV4439                          STATION RECOVERY (2012)
 HV4439
 HV4439'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV4439'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1377 ***********************************************************************
 HV1377  DESIGNATION -  UNIVERSITY
 HV1377  PID         -  HV1377
 HV1377  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1377  COUNTRY     -  US
 HV1377  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1377
 HV1377                         *CURRENT SURVEY CONTROL
 HV1377  ______________________________________________________________________
 HV1377* NAD 83(1986) POSITION- 38 56 02.     (N) 076 59 42.     (W)   SCALED
 HV1377* NAVD 88 ORTHO HEIGHT -    48.887 (meters)      160.39  (feet) ADJUSTED
 HV1377  ______________________________________________________________________
 HV1377  GEOID HEIGHT    -        -32.066 (meters)                     GEOID18
 HV1377  DYNAMIC HEIGHT  -         48.862 (meters)      160.31  (feet) COMP
 HV1377  MODELED GRAVITY -    980,109.0   (mgal)                       NAVD 88
 HV1377
 HV1377  VERT ORDER      -  FIRST     CLASS II
 HV1377
 HV1377.The horizontal coordinates were scaled from a map and have
 HV1377.an estimated accuracy of +/- 6 seconds.
 HV1377
 HV1377.The orthometric height was determined by differential leveling and
 HV1377.adjusted by the NATIONAL GEODETIC SURVEY
 HV1377.in June 1991.
 HV1377
 HV1377.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1377.GEOID18 height accuracy estimate available here.
 HV1377
 HV1377.Click photographs - Photos may exist for this station.
 HV1377
 HV1377.The dynamic height is computed by dividing the NAVD 88
 HV1377.geopotential number by the normal gravity value computed on the
 HV1377.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1377.degrees latitude (g = 980.6199 gals.).
 HV1377
 HV1377.The modeled gravity was interpolated from observed gravity values.
 HV1377
 HV1377
 HV1377_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ270113(NAD 83)
 HV1377
 HV1377                          SUPERSEDED SURVEY CONTROL
 HV1377
 HV1377  NGVD 29 (11/26/84)   49.116  (m)          161.14   (f) ADJUSTED    1 2
 HV1377
 HV1377.Superseded values are not recommended for survey control.
 HV1377
 HV1377.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1377.See file dsdata.pdf to determine how the superseded data were derived.
 HV1377
 HV1377_MARKER: DB = BENCH MARK DISK
 HV1377_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1377_SP_SET: BUILDING
 HV1377_STAMPING: UNIVERSITY 1933
 HV1377_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1377
 HV1377  HISTORY     - Date     Condition        Report By
 HV1377  HISTORY     - 1933     MONUMENTED       CGS
 HV1377  HISTORY     - 1944     GOOD             CGS
 HV1377  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV1377
 HV1377                          STATION DESCRIPTION
 HV1377
 HV1377'DESCRIBED BY COAST AND GEODETIC SURVEY 1944
 HV1377'AT BROOKLAND.
 HV1377'AT BROOKLAND, D.C., ON THE METROPOLITAN BRANCH OF THE BALTIMORE
 HV1377'AND OHIO RAILROAD, AT UNIVERSITY STATION, IN THE MIDDLE OF THE
 HV1377'EAST WALL, 27 FEET WEST OF THE CENTERLINE OF THE SOUTHBOUND
 HV1377'TRACK, AND 3 FEET ABOVE THE SIDEWALK.  A STANDARD DISK, STAMPED
 HV1377'UNIVERSITY AND SET VERTICALLY.
 HV1377
 HV1377                          STATION RECOVERY (1971)
 HV1377
 HV1377'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971
 HV1377'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4376 ***********************************************************************
 HV4376  DESIGNATION -  UP
 HV4376  PID         -  HV4376
 HV4376  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4376  COUNTRY     -  US
 HV4376  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4376
 HV4376                         *CURRENT SURVEY CONTROL
 HV4376  ______________________________________________________________________
 HV4376* NAD 83(1993) POSITION- 38 54 43.65579(N) 077 05 17.72247(W)   ADJUSTED
 HV4376* NAVD 88 ORTHO HEIGHT -    67.    (meters)      220.    (feet) SCALED
 HV4376  ______________________________________________________________________
 HV4376  GEOID HEIGHT    -        -31.976 (meters)                     GEOID18
 HV4376  LAPLACE CORR    -         -2.44  (seconds)                    DEFLEC18
 HV4376  HORZ ORDER      -  SECOND
 HV4376
 HV4376.The horizontal coordinates were established by classical geodetic methods
 HV4376.and adjusted by the National Geodetic Survey in November 1994.
 HV4376
 HV4376.The orthometric height was scaled from a topographic map.
 HV4376
 HV4376.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4376.GEOID18 height accuracy estimate available here.
 HV4376
 HV4376.Click photographs - Photos may exist for this station.
 HV4376
 HV4376.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4376
 HV4376. The following values were computed from the NAD 83(1993) position.
 HV4376
 HV4376;                    North         East     Units Scale Factor Converg.
 HV4376;SPC MD       -   138,255.154   392,345.615   MT  0.99995005   -0 03 19.4
 HV4376;SPC MD       -   453,592.12  1,287,220.57   sFT  0.99995005   -0 03 19.4
 HV4376;SPC VA N     - 2,139,187.752 3,622,435.877   MT  0.99996157   +0 52 51.9
 HV4376;SPC VA N     - 7,018,318.48 11,884,608.37   sFT  0.99996157   +0 52 51.9
 HV4376;UTM  18      - 4,309,098.272   318,942.231   MT  1.00000368   -1 18 43.4
 HV4376
 HV4376!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4376!SPC MD       -   0.99999454  x   0.99995005  =   0.99994459
 HV4376!SPC VA N     -   0.99999454  x   0.99996157  =   0.99995611
 HV4376!UTM  18      -   0.99999454  x   1.00000368  =   0.99999822
 HV4376
 HV4376:                Primary Azimuth Mark                     Grid Az
 HV4376:SPC MD       -  GEORGETOWN UNIV LOWER SPIRE              113 33 43.4
 HV4376:SPC VA N     -  GEORGETOWN UNIV LOWER SPIRE              112 37 32.1
 HV4376:UTM  18      -  GEORGETOWN UNIV LOWER SPIRE              114 49 07.4
 HV4376
 HV4376_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1894209098(NAD 83)
 HV4376
 HV4376|---------------------------------------------------------------------|
 HV4376| PID    Reference Object                     Distance      Geod. Az  |
 HV4376|                                                           dddmmss.s |
 HV4376| HV3961 GEORGETOWN UNIV LOWER SPIRE         APPROX. 1.5 KM 1133024.0 |
 HV4376| HV4375 RESERVOIR SCHOOL FLAGSTAFF          389.342 METERS 21439     |
 HV4376| HV1823 VOIR                                396.780 METERS 22413     |
 HV4376| HV3993 CATHOLIC CHURCH SPIRE               APPROX. 0.7 KM 3082721.5 |
 HV4376| DC7657 UP WM 1                              10.668 METERS 33405     |
 HV4376| DC7658 UP WM 2                              21.641 METERS 33405     |
 HV4376| DC7656 UP RM 1                              10.560 METERS 33628     |
 HV4376|---------------------------------------------------------------------|
 HV4376
 HV4376                          SUPERSEDED SURVEY CONTROL
 HV4376
 HV4376  NAD 83(1991)-  38 54 43.65458(N)    077 05 17.72406(W) AD(       ) 2
 HV4376  NAD 83(1986)-  38 54 43.65435(N)    077 05 17.73404(W) AD(       ) 2
 HV4376  NAD 27      -  38 54 43.25400(N)    077 05 18.80600(W) AD(       ) 2
 HV4376  USSD        -  38 54 43.59100(N)    077 05 18.64000(W) AD(       ) 3
 HV4376
 HV4376.Superseded values are not recommended for survey control.
 HV4376
 HV4376.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4376.See file dsdata.pdf to determine how the superseded data were derived.
 HV4376
 HV4376_MARKER: DS = TRIANGULATION STATION DISK
 HV4376_SETTING: 80 = SET IN A BOULDER
 HV4376
 HV4376  HISTORY     - Date     Condition        Report By
 HV4376  HISTORY     - 1913     MONUMENTED       CGS
 HV4376  HISTORY     - 1925     SEE DESCRIPTION  CGS
 HV4376  HISTORY     - 1927     GOOD             CGS
 HV4376  HISTORY     - 1935     GOOD             CGS
 HV4376  HISTORY     - 1938     GOOD             CGS
 HV4376  HISTORY     - 1939     GOOD             NPS
 HV4376  HISTORY     - 1946     MARK NOT FOUND   CGS
 HV4376  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4376
 HV4376                          STATION DESCRIPTION
 HV4376
 HV4376'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4376'THE STATION IS ON THE BROW OF THE PROMINENT HILL WHICH IS
 HV4376'LOCATED ABOUT 200 METERS E OF THE E END OF THE TWIN RESERVOIR IN
 HV4376'GEORGETOWN.  IT IS THE HIGHEST SUMMIT BETWEEN THE CONDUIT ROAD
 HV4376'AND NEW CUT ROAD.  THE STATION IS ON THE EXTREME S END OF THE
 HV4376'SUMMIT OF THE HILL AND ABOUT A FOOT NE OF THE BARBED WIRE FENCE
 HV4376'WHICH CROSSES THE TOP OF THE HILL.  THERE IS A SHARP DROP OF
 HV4376'ABOUT 3 FEET ON THE OPPOSITE SIDE OF THE FENCE FROM THE
 HV4376'STATION.  ON THE OPPOSITE SIDE OF THE FENCE TOWARD THE N FROM
 HV4376'THE STATION IS AN OAK TREE AT A DISTANCE OF 81 FEET AND A PINE
 HV4376'TREE AT A DISTANCE OF 42.8 FEET FROM THE STATION.
 HV4376'
 HV4376'THE SURFACE MARK IS A REGULAR C. AND G.S. STATION MARK SET IN
 HV4376'THE TOP OF A LARGE BOULDER FLUSH WITH THE SURFACE OF THE GROUND.
 HV4376'THE UNDERGROUND MARK IS A 3/4-INCH DRILL HOLE SURROUNDED BY A
 HV4376'TRIANGLE IN A LARGE BOULDER WITH ITS TOP ABOUT 15 INCHES BELOW
 HV4376'THE SURFACE OF THE GROUND.
 HV4376
 HV4376                          STATION RECOVERY (1925)
 HV4376
 HV4376'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1925 (GLB)
 HV4376'STATION FOUND AS DESCRIBED.  SURFACE MARK WAS GONE, BUT
 HV4376'UNDERGROUND MARK RECOVERED.  NEW SURFACE MARK SET IN 12-INCH TILE
 HV4376'FILLED WITH CONCRETE AND PROJECTING 8 INCHES ABOVE SURFACE
 HV4376'OF GROUND.  ENGINEER CORPS TRIANGULATION MARK USED.  ONE
 HV4376'REGULATION REFERENCE MARK SET IN CONCRETE AT THE FOOT OF THE PINE
 HV4376'TREE FORMING WITNESS MARK NO. 1.
 HV4376
 HV4376                          STATION RECOVERY (1927)
 HV4376
 HV4376'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1927 (BW)
 HV4376'STATION RECOVERED AS DESCRIBED.
 HV4376
 HV4376                          STATION RECOVERY (1935)
 HV4376
 HV4376'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4376'THE STATION MARK WAS RECOVERED AS DESCRIBED BY G.L.B. IN 1925.
 HV4376'A REFERENCE MARK WAS ESTABLISHED.  THE OLD REFERENCE MARK WAS
 HV4376'NOT RECOVERED.
 HV4376'
 HV4376'THE STATION IS ON THE BROW OF A PROMINENT HILL, BETWEEN
 HV4376'RESERVOIR ROAD AND CONDUIT ROAD, ABOUT 200 METERS E OF THE E END
 HV4376'OF THE TWIN RESERVOIR IN GEORGETOWN.
 HV4376'
 HV4376'THE STATION IS IN A FIELD IN BACK OF FARMHOUSE, NEAR THE S
 HV4376'END OF THE HILL, IN A WIRE FENCE LINE, 12.9 METERS S OF A 20-INCH
 HV4376'PINE.  THE MARK CONSISTS OF A STANDARD U.S. ENGINEERS DISK SET
 HV4376'IN THE CENTER OF THE TOP OF A 12-INCH TILE THAT PROJECTS ABOUT
 HV4376'8 INCHES ABOVE GROUND.  THE UNDERGROUND MARK IS DESCRIBED AS A
 HV4376'3/4-INCH DRILL HOLE SURROUNDED BY A TRIANGLE IN A LARGE BOULDER
 HV4376'WITH ITS TOP ABOUT 15 INCHES BELOW THE SURFACE OF THE GROUND.
 HV4376'
 HV4376'THE REFERENCE MARK IS A STANDARD BRONZE DISK SET IN CONCRETE,
 HV4376'AND STAMPED 1935, AND IS NW OF THE
 HV4376'STATION.  THE LOWER OF TWO SPIRES AT GEORGETOWN UNIVERSITY WILL
 HV4376'SERVE AS AN AZIMUTH MARK.
 HV4376'
 HV4376'TO REACH GO S ON RESERVOIR ROAD FROM ITS INTERSECTION WITH
 HV4376'CONDUIT ROAD ABOUT 0.4 MILE TO DRIVEWAY LEADING RIGHT TO
 HV4376'FARMHOUSE.
 HV4376
 HV4376                          STATION RECOVERY (1938)
 HV4376
 HV4376'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4376'STATION RECOVERED.  REFERENCE MARKS OR WITNESS MARKS NOT
 HV4376'REARCHED FOR.
 HV4376
 HV4376                          STATION RECOVERY (1939)
 HV4376
 HV4376'RECOVERY NOTE BY NATIONAL PARK SERVICE 1939
 HV4376'WAVERLY TAYLOR INCORPORATED, REALTORS, RECENTLY ADVISED THE
 HV4376'NATIONAL PARK SERVICE THAT THE AREA ON WHICH UP IS LOCATED IS TO
 HV4376'BE CUT DOWN APPROXIMATELY 8 FEET.  ACCORDINGLY, WITNESS POINTS
 HV4376'WERE SET ON THE N AND S CURBS OF RESERVOIR ROAD.
 HV4376'
 HV4376'ALL WITNESS POINTS ARE SCREWS SET IN THE CONCRETE CURB OF
 HV4376'SIDEWALK.  ALL BEARINGS ARE REFERRED TO A PLANE COORDINATE
 HV4376'SYSTEM WITH ITS ORIGIN AT U.S.C. AND G.S. STATION CAPITOL.
 HV4376
 HV4376                          STATION RECOVERY (1946)
 HV4376
 HV4376'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4376'APPARENTLY, STATION HAS BEEN DESTROYED BY GRADING.
 HV4376
 HV4376                          STATION RECOVERY (1971)
 HV4376
 HV4376'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4376'STATION CAN BE CONSIDERED LOST AS NO TRACE OF THE MARK COULD BE
 HV4376'RECOVERED AND THE AREA IN WHICH IT WAS LOCATED HAS UNDERGONE A
 HV4376'DRASTIC CHANGE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6624 ***********************************************************************
 DL6624  DESIGNATION -  UP NORTHWEST
 DL6624  PID         -  DL6624
 DL6624  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6624  COUNTRY     -  US
 DL6624  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6624
 DL6624                         *CURRENT SURVEY CONTROL
 DL6624  ______________________________________________________________________
 DL6624* NAD 83(1986) POSITION- 38 53 22.94   (N) 077 03 03.91   (W)   HD_HELD1
 DL6624* NAVD 88 ORTHO HEIGHT -     8.946 (meters)       29.35  (feet) ADJUSTED
 DL6624  ______________________________________________________________________
 DL6624  GEOID HEIGHT    -        -32.068 (meters)                     GEOID18
 DL6624  DYNAMIC HEIGHT  -          8.942 (meters)       29.34  (feet) COMP
 DL6624  MODELED GRAVITY -    980,095.5   (mgal)                       NAVD 88
 DL6624
 DL6624  VERT ORDER      -  FIRST     CLASS II
 DL6624
 DL6624.The horizontal coordinates were determined by differentially corrected
 DL6624.hand held GPS observations or other comparable positioning techniques
 DL6624.and have an estimated accuracy of +/- 3 meters.
 DL6624
 DL6624.The orthometric height was determined by differential leveling and
 DL6624.adjusted by the NATIONAL GEODETIC SURVEY
 DL6624.in October 2012.
 DL6624
 DL6624.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6624.GEOID18 height accuracy estimate available here.
 DL6624
 DL6624.Click photographs - Photos may exist for this station.
 DL6624
 DL6624.The dynamic height is computed by dividing the NAVD 88
 DL6624.geopotential number by the normal gravity value computed on the
 DL6624.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6624.degrees latitude (g = 980.6199 gals.).
 DL6624
 DL6624.The modeled gravity was interpolated from observed gravity values.
 DL6624
 DL6624
 DL6624_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2210906536(NAD 83)
 DL6624
 DL6624                          SUPERSEDED SURVEY CONTROL
 DL6624
 DL6624  NAVD 88 (04/20/10)    8.955  (m)           29.38   (f) SUPERSEDED  1 2
 DL6624
 DL6624.Superseded values are not recommended for survey control.
 DL6624
 DL6624.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 DL6624.See file dsdata.pdf to determine how the superseded data were derived.
 DL6624
 DL6624_MARKER: DD = SURVEY DISK
 DL6624_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 DL6624_SP_SET: SIDEWALK
 DL6624_STAMPING: U.P.
 DL6624_MARK LOGO: NONE
 DL6624_MAGNETIC: N = NO MAGNETIC MATERIAL
 DL6624_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 DL6624_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 DL6624+SATELLITE: SATELLITE OBSERVATIONS - December 11, 2021
 DL6624
 DL6624  HISTORY     - Date     Condition        Report By
 DL6624  HISTORY     - 2000     MONUMENTED       NPS
 DL6624  HISTORY     - 20081222 GOOD             NGS
 DL6624  HISTORY     - 20120301 GOOD             NGS
 DL6624  HISTORY     - 20180717 GOOD             USPSQD
 DL6624  HISTORY     - 20211211 GOOD             USPSQD
 DL6624
 DL6624                          STATION DESCRIPTION
 DL6624
 DL6624'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6624'THE MARK IS LOCATED ALONG THE SIDEWALK LEADING TO THE LINCOLN MEMORIAL
 DL6624'IN WASHINGTON DC NORTHWEST QUADRANT.
 DL6624'
 DL6624'IT IS 3.6 FT (1.1 M) SOUTHWEST OF A RETAINING WALL, 14.9 FT (4.5 M)
 DL6624'NORTHWEST OF THE CURB AND 95.8 FT (29.2 M) SOUTHEAST OF A STREET SIGN.
 DL6624
 DL6624                          STATION RECOVERY (2012)
 DL6624
 DL6624'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DL6624'RECOVERED AS DESCRIBED.
 DL6624
 DL6624                          STATION RECOVERY (2018)
 DL6624
 DL6624'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 DL6624'RECOVERED IN GOOD CONDITION.
 DL6624
 DL6624                          STATION RECOVERY (2021)
 DL6624
 DL6624'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 DL6624'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6626 ***********************************************************************
 DL6626  DESIGNATION -  UP SOUTH
 DL6626  PID         -  DL6626
 DL6626  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6626  COUNTRY     -  US
 DL6626  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6626
 DL6626                         *CURRENT SURVEY CONTROL
 DL6626  ______________________________________________________________________
 DL6626* NAD 83(1986) POSITION- 38 53 18.32   (N) 077 03 00.95   (W)   HD_HELD1
 DL6626* NAVD 88 ORTHO HEIGHT -     6.889 (meters)       22.60  (feet) ADJUSTED
 DL6626  ______________________________________________________________________
 DL6626  GEOID HEIGHT    -        -32.071 (meters)                     GEOID18
 DL6626  DYNAMIC HEIGHT  -          6.885 (meters)       22.59  (feet) COMP
 DL6626  MODELED GRAVITY -    980,095.7   (mgal)                       NAVD 88
 DL6626
 DL6626  VERT ORDER      -  FIRST     CLASS II
 DL6626
 DL6626.The horizontal coordinates were determined by differentially corrected
 DL6626.hand held GPS observations or other comparable positioning techniques
 DL6626.and have an estimated accuracy of +/- 3 meters.
 DL6626
 DL6626.The orthometric height was determined by differential leveling and
 DL6626.adjusted by the NATIONAL GEODETIC SURVEY
 DL6626.in October 2012.
 DL6626
 DL6626.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6626.GEOID18 height accuracy estimate available here.
 DL6626
 DL6626.Click photographs - Photos may exist for this station.
 DL6626
 DL6626.The dynamic height is computed by dividing the NAVD 88
 DL6626.geopotential number by the normal gravity value computed on the
 DL6626.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6626.degrees latitude (g = 980.6199 gals.).
 DL6626
 DL6626.The modeled gravity was interpolated from observed gravity values.
 DL6626
 DL6626
 DL6626_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2217706392(NAD 83)
 DL6626
 DL6626                          SUPERSEDED SURVEY CONTROL
 DL6626
 DL6626  NAVD 88 (04/20/10)    6.897  (m)           22.63   (f) SUPERSEDED  1 2
 DL6626
 DL6626.Superseded values are not recommended for survey control.
 DL6626
 DL6626.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 DL6626.See file dsdata.pdf to determine how the superseded data were derived.
 DL6626
 DL6626_MARKER: DD = SURVEY DISK
 DL6626_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 DL6626_SP_SET: SIDEWALK
 DL6626_STAMPING: U.P.
 DL6626_MARK LOGO: NONE
 DL6626_MAGNETIC: N = NO MAGNETIC MATERIAL
 DL6626_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 DL6626_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 DL6626+SATELLITE: SATELLITE OBSERVATIONS - December 11, 2021
 DL6626
 DL6626  HISTORY     - Date     Condition        Report By
 DL6626  HISTORY     - 2000     MONUMENTED       NPS
 DL6626  HISTORY     - 20081124 GOOD             NGS
 DL6626  HISTORY     - 20120301 GOOD             NGS
 DL6626  HISTORY     - 20180717 GOOD             USPSQD
 DL6626  HISTORY     - 20211211 GOOD             USPSQD
 DL6626
 DL6626                          STATION DESCRIPTION
 DL6626
 DL6626'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6626'THE MARK IS LOCATED ALONG THE SIDEWALK LEADING TO THE LINCOLN MEMORIAL
 DL6626'IN WASHINGTON DC NORTHWEST QUADRANT.
 DL6626'
 DL6626'IT IS 36.5 FT (11.1 M) NORTH OF THE CURB WITH THREE SEWER COVERS, 9.4
 DL6626'FT (2.9 M) NORTHWEST OF A SEWER ACCESS GRATE AND 3.7 FT (1.1 M) SOUTH
 DL6626'OF A RETAINING WALL.
 DL6626
 DL6626                          STATION RECOVERY (2012)
 DL6626
 DL6626'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DL6626'RECOVERED AS DESCRIBED.
 DL6626
 DL6626                          STATION RECOVERY (2018)
 DL6626
 DL6626'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 DL6626'U.P. STAMPING IS VERY WORN AND HARD TO SEE.
 DL6626
 DL6626                          STATION RECOVERY (2021)
 DL6626
 DL6626'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 DL6626'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6625 ***********************************************************************
 DL6625  DESIGNATION -  UP WEST
 DL6625  PID         -  DL6625
 DL6625  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6625  COUNTRY     -  US
 DL6625  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6625
 DL6625                         *CURRENT SURVEY CONTROL
 DL6625  ______________________________________________________________________
 DL6625* NAD 83(1986) POSITION- 38 53 20.32   (N) 077 03 04.30   (W)   HD_HELD1
 DL6625* NAVD 88 ORTHO HEIGHT -     8.785 (meters)       28.82  (feet) ADJUSTED
 DL6625  ______________________________________________________________________
 DL6625  GEOID HEIGHT    -        -32.069 (meters)                     GEOID18
 DL6625  DYNAMIC HEIGHT  -          8.781 (meters)       28.81  (feet) COMP
 DL6625  MODELED GRAVITY -    980,095.5   (mgal)                       NAVD 88
 DL6625
 DL6625  VERT ORDER      -  FIRST     CLASS II
 DL6625
 DL6625.The horizontal coordinates were determined by differentially corrected
 DL6625.hand held GPS observations or other comparable positioning techniques
 DL6625.and have an estimated accuracy of +/- 3 meters.
 DL6625
 DL6625.The orthometric height was determined by differential leveling and
 DL6625.adjusted by the NATIONAL GEODETIC SURVEY
 DL6625.in October 2012.
 DL6625
 DL6625.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6625.GEOID18 height accuracy estimate available here.
 DL6625
 DL6625.Click photographs - Photos may exist for this station.
 DL6625
 DL6625.The dynamic height is computed by dividing the NAVD 88
 DL6625.geopotential number by the normal gravity value computed on the
 DL6625.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6625.degrees latitude (g = 980.6199 gals.).
 DL6625
 DL6625.The modeled gravity was interpolated from observed gravity values.
 DL6625
 DL6625
 DL6625_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2209806456(NAD 83)
 DL6625
 DL6625                          SUPERSEDED SURVEY CONTROL
 DL6625
 DL6625  NAVD 88 (04/20/10)    8.792  (m)           28.85   (f) SUPERSEDED  1 2
 DL6625
 DL6625.Superseded values are not recommended for survey control.
 DL6625
 DL6625.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 DL6625.See file dsdata.pdf to determine how the superseded data were derived.
 DL6625
 DL6625_MARKER: DD = SURVEY DISK
 DL6625_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 DL6625_SP_SET: SIDEWALK
 DL6625_STAMPING: U.P.
 DL6625_MARK LOGO: NONE
 DL6625_MAGNETIC: N = NO MAGNETIC MATERIAL
 DL6625_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 DL6625_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 DL6625+SATELLITE: SATELLITE OBSERVATIONS - December 11, 2021
 DL6625
 DL6625  HISTORY     - Date     Condition        Report By
 DL6625  HISTORY     - 2000     MONUMENTED       NPS
 DL6625  HISTORY     - 20081124 GOOD             NGS
 DL6625  HISTORY     - 20120301 GOOD             NGS
 DL6625  HISTORY     - 20180717 GOOD             USPSQD
 DL6625  HISTORY     - 20211211 GOOD             USPSQD
 DL6625
 DL6625                          STATION DESCRIPTION
 DL6625
 DL6625'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6625'THE MARK IS LOCATED ALONG THE SIDEWALK LEADING TO THE LINCOLN MEMORIAL
 DL6625'IN WASHINGTON DC NORTHWEST QUADRANT.
 DL6625'
 DL6625'IT IS 15.1 FT (4.6 M) EAST OF THE WEST EDGE OF A CURB, 3.6 FT (1.1 M)
 DL6625'WEST OF A RETAINING WALL, 42.3 FT (12.9 M) SOUTHEAST OF A SEWER COVER.
 DL6625
 DL6625                          STATION RECOVERY (2012)
 DL6625
 DL6625'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DL6625'RECOVERED AS DESCRIBED.
 DL6625
 DL6625                          STATION RECOVERY (2018)
 DL6625
 DL6625'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 DL6625'RECOVERED IN GOOD CONDITION.
 DL6625
 DL6625                          STATION RECOVERY (2021)
 DL6625
 DL6625'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 DL6625'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4525 ***********************************************************************
 HV4525  DESIGNATION -  USED 1330
 HV4525  PID         -  HV4525
 HV4525  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4525  COUNTRY     -  US
 HV4525  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4525
 HV4525                         *CURRENT SURVEY CONTROL
 HV4525  ______________________________________________________________________
 HV4525* NAD 83(1993) POSITION- 38 52 34.70440(N) 077 02 49.53479(W)   ADJUSTED
 HV4525* NAVD 88 ORTHO HEIGHT -     6.39  (+/-2cm)       21.0   (feet) VERTCON3
 HV4525  ______________________________________________________________________
 HV4525  GEOID HEIGHT    -        -32.097 (meters)                     GEOID18
 HV4525  LAPLACE CORR    -         -2.78  (seconds)                    DEFLEC18
 HV4525  HORZ ORDER      -  THIRD
 HV4525  VERT ORDER      -  THIRD ? (See Below)
 HV4525
 HV4525.The horizontal coordinates were established by classical geodetic methods
 HV4525.and adjusted by the National Geodetic Survey in November 1994.
 HV4525
 HV4525.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4525.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4525
 HV4525.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4525.GEOID18 height accuracy estimate available here.
 HV4525
 HV4525.The vertical order pertains to the NGVD 29 superseded value.
 HV4525
 HV4525.Click photographs - Photos may exist for this station.
 HV4525
 HV4525.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4525
 HV4525. The following values were computed from the NAD 83(1993) position.
 HV4525
 HV4525;                    North         East     Units Scale Factor Converg.
 HV4525;SPC MD       -   134,276.223   395,913.615   MT  0.99994985   -0 01 46.4
 HV4525;SPC MD       -   440,537.91  1,298,926.59   sFT  0.99994985   -0 01 46.4
 HV4525;SPC VA N     - 2,135,267.624 3,626,068.464   MT  0.99995856   +0 54 24.4
 HV4525;SPC VA N     - 7,005,457.20 11,896,526.29   sFT  0.99995856   +0 54 24.4
 HV4525;UTM  18      - 4,305,041.893   322,422.308   MT  0.99998831   -1 17 06.6
 HV4525
 HV4525!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4525!SPC MD       -   1.00000403  x   0.99994985  =   0.99995388
 HV4525!SPC VA N     -   1.00000403  x   0.99995856  =   0.99996259
 HV4525!UTM  18      -   1.00000403  x   0.99998831  =   0.99999234
 HV4525
 HV4525:                Primary Azimuth Mark                     Grid Az
 HV4525:SPC MD       -  TIDAL USE                                039 20 26.7
 HV4525:SPC VA N     -  TIDAL USE                                038 24 15.9
 HV4525:UTM  18      -  TIDAL USE                                040 35 46.9
 HV4525
 HV4525_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2242205041(NAD 83)
 HV4525
 HV4525|---------------------------------------------------------------------|
 HV4525| PID    Reference Object                     Distance      Geod. Az  |
 HV4525|                                                           dddmmss.s |
 HV4525| HV4436 TIDAL USE                           APPROX. 0.6 KM 0391840.3 |
 HV4525|---------------------------------------------------------------------|
 HV4525
 HV4525                          SUPERSEDED SURVEY CONTROL
 HV4525
 HV4525  NAD 83(1991)-  38 52 34.70312(N)    077 02 49.53627(W) AD(       ) 3
 HV4525  NAD 83(1986)-  38 52 34.70286(N)    077 02 49.54689(W) AD(       ) 3
 HV4525  NAD 27      -  38 52 34.30035(N)    077 02 50.62193(W) AD(       ) 3
 HV4525  NGVD 29               6.63   (m)           21.8    (f) LEVELING    3  
 HV4525
 HV4525.Superseded values are not recommended for survey control.
 HV4525
 HV4525.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4525.See file dsdata.pdf to determine how the superseded data were derived.
 HV4525
 HV4525_MARKER: DD = SURVEY DISK
 HV4525_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV4525_SP_SET: SLATE WALKWAY
 HV4525_STAMPING: 1330
 HV4525_MARK LOGO: USACE
 HV4525_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4525_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4525+SATELLITE: SATELLITE OBSERVATIONS - May 11, 2012
 HV4525
 HV4525  HISTORY     - Date     Condition        Report By
 HV4525  HISTORY     - 1980     MONUMENTED       USACE
 HV4525  HISTORY     - 20020912 GOOD             GEOCAC
 HV4525  HISTORY     - 20120511 GOOD             PROFLN
 HV4525  HISTORY     - 20120519 GOOD             PROFLN
 HV4525
 HV4525                          STATION DESCRIPTION
 HV4525
 HV4525'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1980 (BMP)
 HV4525'THE STATION IS ON COLUMBIA ISLAND A PART OF THE DISTRICT OF
 HV4525'COLUMBIA ON THE VIRGINIA OR WEST SIDE OF THE POTOMAC RIVER.
 HV4525'
 HV4525'TO REACH THE STATION WHICH IS ON THE STEPS OF THE MARINERS
 HV4525'MEMORIAL ON THE SOUTH END OF THE ISLAND ONE CAN PARK IN A
 HV4525'SMALL PARKING AREA FOR THE MEMORIAL WHICH IS ON THE EAST SIDE
 HV4525'OF THE GEORGE WASHINGTON PARKWAY APPROXIMATELY 0.43 KM NORTH
 HV4525'OF THE SOUTHBOUND LANE OF THE 14TH STREET BRIDGE.
 HV4525'
 HV4525'THE STATION DISK IS A 7.5 CM CORPS OF ENGINEERS BRASS DISK
 HV4525'STAMPED---USED 1330---SET IN CONCRETE IN THE FLAGSTONE WALKWAY
 HV4525'ON THE EAST OR RIVER SIDE OF THE MEMORIAL. IT IS IN THE SECOND
 HV4525'OF FOUR LANDINGS IN THE STAIRS LEADING TO THE MONUMENT,
 HV4525'1.76 METERS (5.8 FT) NORTH OF A LOW WALL BOARDERING THE SOUTH
 HV4525'SIDE OF THE WALK, 1.86 METERS (6.1 FT) SOUTH OF THE LOW WALL
 HV4525'BOARDERING THE NORTH SIDE OF THE WALK, 10.4 METERS (34.0 FT)
 HV4525'FROM THE GRASS LAWN AT THE BOTTOM OF THE STAIRS AND 8.0 METERS
 HV4525'(26.1 FT) EAST OF THE MARBLE BASE OF THE MONUMENT.
 HV4525
 HV4525                          STATION RECOVERY (2002)
 HV4525
 HV4525'RECOVERY NOTE BY GEOCACHING 2002 (APC)
 HV4525'RECOVERED IN GOOD CONDITION.
 HV4525
 HV4525                          STATION RECOVERY (2012)
 HV4525
 HV4525'RECOVERY NOTE BY PROFESSIONAL LAND SURVEYOR 2012 (JRO)
 HV4525'THE MARK WAS RECOVERED IN GOOD CONDITION PER 1980 DESCRIPTION BY BMP.
 HV4525'THIS MARK IS NEAR STATION START (HV4431), WHICH MAY OR MAY NOT STILL
 HV4525'BE THERE UNDER ASPHALT SIDEWALK.  START INVERSES AS 14.092 M (46.2 FT)
 HV4525'ON AZIMUTH 359-58-14 FROM THIS STATION.
 HV4525'
 HV4525'TO REACH THIS STATION THERE ARE BASICALLY TWO OPTIONS--EITHER PULL OFF
 HV4525'NORTHBOUND GEORGE WASHINGTON PARKWAY IN THE VICINITY OF THE MARINERS
 HV4525'MEMORIAL (PERMISSION FROM PARK SERVICE MAY BE NEEDED), OR PARK AT THE
 HV4525'COLUMBIA ISLAND MARINA / LYNDON JOHNSON GROVE AND WALK ABOUT A QUARTER
 HV4525'MILE EASTERLY ALONG THE BIKE PATH UNDER THE PARKWAY BRIDGE FROM THE
 HV4525'SOUTH END OF THE PARKING LOT TO THE MEMORIAL.
 HV4525
 HV4525                          STATION RECOVERY (2012)
 HV4525
 HV4525'RECOVERY NOTE BY PROFESSIONAL LAND SURVEYOR 2012 (JRO)
 HV4525'THE MARK WAS RECOVERED IN GOOD CONDITION PER 1980 DESCRIPTION BY BMP.
 HV4525'THIS MARK IS NEAR STATION START (HV4431), WHICH MAY OR MAY NOT STILL
 HV4525'BE THERE UNDER ASPHALT SIDEWALK.  START INVERSES AS 14.092 M (46.2 FT)
 HV4525'ON AZIMUTH 359-58-14 FROM THIS STATION.
 HV4525'
 HV4525'TO REACH THIS STATION THERE ARE BASICALLY TWO OPTIONS--EITHER PULL OFF
 HV4525'NORTHBOUND GEORGE WASHINGTON PARKWAY IN THE VICINITY OF THE MARINERS
 HV4525'MEMORIAL (PERMISSION FROM PARK SERVICE MAY BE NEEDED), OR PARK AT THE
 HV4525'COLUMBIA ISLAND MARINA / LYNDON JOHNSON GROVE AND WALK ABOUT A QUARTER
 HV4525'MILE EASTERLY ALONG THE BIKE PATH UNDER THE PARKWAY BRIDGE FROM THE
 HV4525'SOUTH END OF THE PARKING LOT TO THE MEMORIAL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DL6618 ***********************************************************************
 DL6618  DESIGNATION -  USFS COMMEMORATIVE MARK
 DL6618  PID         -  DL6618
 DL6618  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DL6618  COUNTRY     -  US
 DL6618  USGS QUAD   -  WASHINGTON WEST (2016)
 DL6618
 DL6618                         *CURRENT SURVEY CONTROL
 DL6618  ______________________________________________________________________
 DL6618* NAD 83(2011) POSITION- 38 53 17.34662(N) 077 01 54.23701(W)   ADJUSTED
 DL6618* NAD 83(2011) ELLIP HT-   -20.568 (meters)        (02/01/15)   ADJUSTED
 DL6618* NAD 83(2011) EPOCH   -  2010.00
 DL6618* NAVD 88 ORTHO HEIGHT -    11.529 (meters)       37.82  (feet) ADJUSTED
 DL6618  ______________________________________________________________________
 DL6618  GEOID HEIGHT    -        -32.096 (meters)                     GEOID18
 DL6618  NAD 83(2011) X  -  1,115,574.997 (meters)                     COMP
 DL6618  NAD 83(2011) Y  - -4,844,325.232 (meters)                     COMP
 DL6618  NAD 83(2011) Z  -  3,982,646.856 (meters)                     COMP
 DL6618  LAPLACE CORR    -         -2.62  (seconds)                    DEFLEC18
 DL6618  DYNAMIC HEIGHT  -         11.523 (meters)       37.81  (feet) COMP
 DL6618  MODELED GRAVITY -    980,098.2   (mgal)                       NAVD 88
 DL6618
 DL6618  VERT ORDER      -  FIRST     CLASS II
 DL6618
 DL6618  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 DL6618  Standards:
 DL6618         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 DL6618            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 DL6618  -------------------------------------------------------------------
 DL6618  NETWORK    0.70   0.14           0.31   0.22   0.07      0.58497205
 DL6618  -------------------------------------------------------------------
 DL6618  Click here for local accuracies and other accuracy information.
 DL6618
 DL6618.The horizontal coordinates were established by classical geodetic methods
 DL6618.and adjusted by the National Geodetic Survey in February 2015.
 DL6618
 DL6618.The orthometric height was determined by differential leveling and
 DL6618.adjusted by the NATIONAL GEODETIC SURVEY
 DL6618.in February 2015.
 DL6618
 DL6618.Significant digits in the geoid height do not necessarily reflect accuracy.
 DL6618.GEOID18 height accuracy estimate available here.
 DL6618
 DL6618.Click photographs - Photos may exist for this station.
 DL6618
 DL6618.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 DL6618
 DL6618.The Laplace correction was computed from DEFLEC18 derived deflections.
 DL6618
 DL6618.The ellipsoidal height was determined by classical geodetic methods
 DL6618.and is referenced to NAD 83.
 DL6618
 DL6618.The dynamic height is computed by dividing the NAVD 88
 DL6618.geopotential number by the normal gravity value computed on the
 DL6618.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DL6618.degrees latitude (g = 980.6199 gals.).
 DL6618
 DL6618.The modeled gravity was interpolated from observed gravity values.
 DL6618
 DL6618. The following values were computed from the NAD 83(2011) position.
 DL6618
 DL6618;                    North         East     Units Scale Factor Converg.
 DL6618;UTM  18      - 4,306,326.720   323,784.168   MT  0.99998238   -1 16 33.1
 DL6618
 DL6618!             -  Elev Factor  x  Scale Factor =   Combined Factor
 DL6618!UTM  18      -   1.00000323  x   0.99998238  =   0.99998561
 DL6618
 DL6618_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2378406326(NAD 83)
 DL6618
 DL6618                          SUPERSEDED SURVEY CONTROL
 DL6618
 DL6618  NAVD 88 (04/20/10)   11.526  (m)           37.81   (f) SUPERSEDED  1 2
 DL6618
 DL6618.Superseded values are not recommended for survey control.
 DL6618
 DL6618.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 DL6618.See file dsdata.pdf to determine how the superseded data were derived.
 DL6618
 DL6618_MARKER: DD = SURVEY DISK
 DL6618_SETTING: 35 = SET IN A MAT FOUNDATION OR CONCRETE SLAB OTHER THAN
 DL6618+WITH SETTING: PAVEMENT
 DL6618_SP_SET: GRANITE BLOCK IN CONCRETE
 DL6618_MARK LOGO: USFS
 DL6618_MAGNETIC: N = NO MAGNETIC MATERIAL
 DL6618_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DL6618+STABILITY: SURFACE MOTION
 DL6618
 DL6618  HISTORY     - Date     Condition        Report By
 DL6618  HISTORY     - 2005     MONUMENTED       USFS
 DL6618  HISTORY     - 20081222 GOOD             NGS
 DL6618  HISTORY     - 20120301 GOOD             NGS
 DL6618  HISTORY     - 20140410 GOOD             NGS
 DL6618  HISTORY     - 20180718 GOOD             USPSQD
 DL6618  HISTORY     - 20211211 GOOD             USPSQD
 DL6618
 DL6618                          STATION DESCRIPTION
 DL6618
 DL6618'DESCRIBED BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 DL6618'THE MARK IS LOCATED 0.21 MI (0.3 KM) SOUTHEAST FROM WASHINGTON
 DL6618'MONUMENT BETWEEN INDEPENDENCE AVENUE AND JEFFERSON DRIVE ALONG 14TH
 DL6618'STREET IN A GRASSY AREA BETWEEN A PARKING LOT AND THE SIDEWALK.
 DL6618'
 DL6618'THE MARK IS A COMMERATIVE DISK SET IN A 1.8 FT (0.5 M) TALL, 1.2 FT
 DL6618'(0.4 M) SQUARE GRANITE BLOCK SET IN CONCRETE.
 DL6618'
 DL6618'THE MARK IS 8.9 FT (2.7 M) EAST OF THE WEST EDGE OF SIDEWALK, 55.3 FT
 DL6618'(16.9 M) SOUTH FROM ENTRANCE TO PARKING LOT AND 45 FT (13.7 M)
 DL6618'NORTHEAST OF A STREET SIGN.
 DL6618
 DL6618                          STATION RECOVERY (2012)
 DL6618
 DL6618'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DL6618'RECOVERED AS DESCRIBED.
 DL6618
 DL6618                          STATION RECOVERY (2014)
 DL6618
 DL6618'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (KF)
 DL6618'RECOVERED AS DESCRIBED.
 DL6618
 DL6618                          STATION RECOVERY (2018)
 DL6618
 DL6618'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 DL6618'THERE IS A LARGE PIECE OF THE GRANITE BLOCK MISSING.
 DL6618
 DL6618                          STATION RECOVERY (2021)
 DL6618
 DL6618'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 DL6618'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1388 ***********************************************************************
 HV1388  DESIGNATION -  V
 HV1388  PID         -  HV1388
 HV1388  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1388  COUNTRY     -  US
 HV1388  USGS QUAD   -  ALEXANDRIA (2019)
 HV1388
 HV1388                         *CURRENT SURVEY CONTROL
 HV1388  ______________________________________________________________________
 HV1388* NAD 83(1986) POSITION- 38 52 24.     (N) 077 00 07.     (W)   SCALED
 HV1388* NAVD 88 ORTHO HEIGHT -     5.322 (meters)       17.46  (feet) ADJUSTED
 HV1388  ______________________________________________________________________
 HV1388  GEOID HEIGHT    -        -32.172 (meters)                     GEOID18
 HV1388  DYNAMIC HEIGHT  -          5.320 (meters)       17.45  (feet) COMP
 HV1388  MODELED GRAVITY -    980,096.3   (mgal)                       NAVD 88
 HV1388
 HV1388  VERT ORDER      -  FIRST     CLASS II
 HV1388
 HV1388.The horizontal coordinates were scaled from a map and have
 HV1388.an estimated accuracy of +/- 6 seconds.
 HV1388
 HV1388.The orthometric height was determined by differential leveling and
 HV1388.adjusted by the NATIONAL GEODETIC SURVEY
 HV1388.in June 1991.
 HV1388
 HV1388.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1388.GEOID18 height accuracy estimate available here.
 HV1388
 HV1388.Click photographs - Photos may exist for this station.
 HV1388
 HV1388.The dynamic height is computed by dividing the NAVD 88
 HV1388.geopotential number by the normal gravity value computed on the
 HV1388.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1388.degrees latitude (g = 980.6199 gals.).
 HV1388
 HV1388.The modeled gravity was interpolated from observed gravity values.
 HV1388
 HV1388
 HV1388_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ263046(NAD 83)
 HV1388
 HV1388                          SUPERSEDED SURVEY CONTROL
 HV1388
 HV1388  NGVD 29 (11/26/84)    5.566  (m)           18.26   (f) ADJUSTED    1 2
 HV1388
 HV1388.Superseded values are not recommended for survey control.
 HV1388
 HV1388.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1388.See file dsdata.pdf to determine how the superseded data were derived.
 HV1388
 HV1388_MARKER: DJ = TIDAL STATION DISK
 HV1388_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1388_SP_SET: FOOTING
 HV1388_STAMPING: V
 HV1388_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1388
 HV1388  HISTORY     - Date     Condition        Report By
 HV1388  HISTORY     - UNK      MONUMENTED       CGS
 HV1388  HISTORY     - 1923     GOOD             CGS
 HV1388  HISTORY     - 1955     GOOD             CGS
 HV1388
 HV1388                          STATION DESCRIPTION
 HV1388
 HV1388'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1388'IN WASHINGTON.
 HV1388'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN
 HV1388'FACTORY, ON SECOND STREET, AT THE NORTHWEST CORNER OF BUILDING
 HV1388'153, AND IN THE SLOPING FACE OF THE CONCRETE FOOTING OF THE
 HV1388'CORNER SUPPORTING COLUMN.  A STANDARD DISK, STAMPED V.
 HV1388
 HV1388                          STATION RECOVERY (1955)
 HV1388
 HV1388'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1388'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2024 ***********************************************************************
 HV2024  DESIGNATION -  V 1
 HV2024  PID         -  HV2024
 HV2024  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2024  COUNTRY     -  US
 HV2024  USGS QUAD   -  ALEXANDRIA (2019)
 HV2024
 HV2024                         *CURRENT SURVEY CONTROL
 HV2024  ______________________________________________________________________
 HV2024* NAD 83(1986) POSITION- 38 51 25.     (N) 077 00 20.     (W)   SCALED
 HV2024* NAVD 88 ORTHO HEIGHT -     3.192 (meters)       10.47  (feet) ADJUSTED
 HV2024  ______________________________________________________________________
 HV2024  GEOID HEIGHT    -        -32.191 (meters)                     GEOID18
 HV2024  DYNAMIC HEIGHT  -          3.190 (meters)       10.47  (feet) COMP
 HV2024  MODELED GRAVITY -    980,093.0   (mgal)                       NAVD 88
 HV2024
 HV2024  VERT ORDER      -  FIRST     CLASS II
 HV2024
 HV2024.The horizontal coordinates were scaled from a map and have
 HV2024.an estimated accuracy of +/- 6 seconds.
 HV2024
 HV2024.The orthometric height was determined by differential leveling and
 HV2024.adjusted by the NATIONAL GEODETIC SURVEY
 HV2024.in June 1991.
 HV2024
 HV2024.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2024.GEOID18 height accuracy estimate available here.
 HV2024
 HV2024.Click photographs - Photos may exist for this station.
 HV2024
 HV2024.The dynamic height is computed by dividing the NAVD 88
 HV2024.geopotential number by the normal gravity value computed on the
 HV2024.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2024.degrees latitude (g = 980.6199 gals.).
 HV2024
 HV2024.The modeled gravity was interpolated from observed gravity values.
 HV2024
 HV2024
 HV2024_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ259028(NAD 83)
 HV2024
 HV2024                          SUPERSEDED SURVEY CONTROL
 HV2024
 HV2024  NGVD 29 (11/26/84)    3.451  (m)           11.32   (f) ADJUSTED    1 2
 HV2024
 HV2024.Superseded values are not recommended for survey control.
 HV2024
 HV2024.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2024.See file dsdata.pdf to determine how the superseded data were derived.
 HV2024
 HV2024_MARKER: DB = BENCH MARK DISK
 HV2024_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV2024_SP_SET: BUILDING
 HV2024_STAMPING: V 1 1931
 HV2024_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV2024
 HV2024  HISTORY     - Date     Condition        Report By
 HV2024  HISTORY     - 1931     MONUMENTED       CGS
 HV2024  HISTORY     - 1971     GOOD             NGS
 HV2024
 HV2024                          STATION DESCRIPTION
 HV2024
 HV2024'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV2024'AT WASHINGTON.
 HV2024'AT WASHINGTON, ABOUT 1 MILE SOUTHEAST ALONG THE BALTIMORE AND
 HV2024'OHIO RAILROAD FROM THE UNIONTOWN FREIGHT STATION IN ANACOSTIA, AT
 HV2024'THE TANK-CAR SIDING AT THE NAVAL AIR STATION, OPPOSITE THE FROG
 HV2024'OF THE SIDING, 26 FEET WEST OF THE WEST RAIL OF THE MAIN TRACK,
 HV2024'AT THE EAST END OF A LARGE DIRT-COVERED STORAGE TANK, AND IN THE
 HV2024'WEST SIDE OF A SMALL CONCRETE BUILDING.  A STANDARD DISK, STAMPED
 HV2024'V 1 1931.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8040 ***********************************************************************
 HV8040  DESIGNATION -  V 2
 HV8040  PID         -  HV8040
 HV8040  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8040  COUNTRY     -  US
 HV8040  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8040
 HV8040                         *CURRENT SURVEY CONTROL
 HV8040  ______________________________________________________________________
 HV8040* NAD 83(1986) POSITION- 38 53 49.     (N) 077 02 16.     (W)   SCALED
 HV8040* NAVD 88 ORTHO HEIGHT -    14.641 (meters)       48.03  (feet) ADJUSTED
 HV8040  ______________________________________________________________________
 HV8040  GEOID HEIGHT    -        -32.070 (meters)                     GEOID18
 HV8040  DYNAMIC HEIGHT  -         14.633 (meters)       48.01  (feet) COMP
 HV8040  MODELED GRAVITY -    980,097.6   (mgal)                       NAVD 88
 HV8040
 HV8040  VERT ORDER      -  FIRST     CLASS 0
 HV8040
 HV8040.The horizontal coordinates were scaled from a map and have
 HV8040.an estimated accuracy of +/- 6 seconds.
 HV8040
 HV8040.The orthometric height was determined by differential leveling and
 HV8040.adjusted by the NATIONAL GEODETIC SURVEY
 HV8040.in June 1991.
 HV8040
 HV8040.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8040.GEOID18 height accuracy estimate available here.
 HV8040
 HV8040.Click photographs - Photos may exist for this station.
 HV8040
 HV8040.The dynamic height is computed by dividing the NAVD 88
 HV8040.geopotential number by the normal gravity value computed on the
 HV8040.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8040.degrees latitude (g = 980.6199 gals.).
 HV8040
 HV8040.The modeled gravity was interpolated from observed gravity values.
 HV8040
 HV8040
 HV8040_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ232073(NAD 83)
 HV8040
 HV8040                          SUPERSEDED SURVEY CONTROL
 HV8040
 HV8040  NGVD 29 (??/??/92)   14.877  (m)           48.81   (f) ADJ UNCH    1 0
 HV8040
 HV8040.Superseded values are not recommended for survey control.
 HV8040
 HV8040.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8040.See file dsdata.pdf to determine how the superseded data were derived.
 HV8040
 HV8040_MARKER: DB = BENCH MARK DISK
 HV8040_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV8040_STAMPING: V 2 1949
 HV8040_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV8040+STABILITY: SURFACE MOTION
 HV8040
 HV8040  HISTORY     - Date     Condition        Report By
 HV8040  HISTORY     - 1949     MONUMENTED       CGS
 HV8040
 HV8040                          STATION DESCRIPTION
 HV8040
 HV8040'DESCRIBED BY COAST AND GEODETIC SURVEY 1949
 HV8040'IN WASHINGTON DC.
 HV8040'AT WASHINGTON, D.C. ON THE WHITE HOUSE GROUNDS, ABOUT 170 FEET SOUTH
 HV8040'FROM THE SOUTHWEST CORNER OF THE WHITE HOUSE, 55.0 FEET NORTH OF
 HV8040'BENCH MARK B, 54.9 FEET SOUTH OF BENCH MARK A, 47.5 FEET NORTHEAST OF
 HV8040'THE CENTER OF A MULTIPLE-TRUNK TREE, 34.4 FEET EAST-SOUTHEAST OF A
 HV8040'SMALL (8 INCHES IN 1952) TREE WHICH IS ON LINE BETWEEN C 2 1949 AND A
 HV8040'LAMPPOST, AND ABOUT 3 INCHES BELOW THE SURFACE OF THE GROUND. A BRASS
 HV8040'DISK, STAMPED 'V 2 1949' AND SET IN THE TOP OF A CONCRETE POST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4452 ***********************************************************************
 HV4452  DESIGNATION -  VIRGINIA BASE 1 USE 1932
 HV4452  PID         -  HV4452
 HV4452  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4452  COUNTRY     -  US
 HV4452  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4452
 HV4452                         *CURRENT SURVEY CONTROL
 HV4452  ______________________________________________________________________
 HV4452* NAD 83(1993) POSITION- 38 54 05.57335(N) 077 04 13.28590(W)   ADJUSTED
 HV4452* NAVD 88 ORTHO HEIGHT -    -0.    (meters)       -0.    (feet) SCALED
 HV4452  ______________________________________________________________________
 HV4452  GEOID HEIGHT    -        -32.020 (meters)                     GEOID18
 HV4452  LAPLACE CORR    -         -2.87  (seconds)                    DEFLEC18
 HV4452  HORZ ORDER      -  SECOND
 HV4452
 HV4452.The horizontal coordinates were established by classical geodetic methods
 HV4452.and adjusted by the National Geodetic Survey in November 1994.
 HV4452
 HV4452.The orthometric height was scaled from a topographic map.
 HV4452
 HV4452.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4452.GEOID18 height accuracy estimate available here.
 HV4452
 HV4452.Click photographs - Photos may exist for this station.
 HV4452
 HV4452.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4452
 HV4452. The following values were computed from the NAD 83(1993) position.
 HV4452
 HV4452;                    North         East     Units Scale Factor Converg.
 HV4452;SPC MD       -   137,079.511   393,897.078   MT  0.99994995   -0 02 39.0
 HV4452;SPC MD       -   449,735.03  1,292,310.66   sFT  0.99994995   -0 02 39.0
 HV4452;SPC VA N     - 2,138,037.609 3,624,006.364   MT  0.99996064   +0 53 32.2
 HV4452;SPC VA N     - 7,014,545.06 11,889,760.88   sFT  0.99996064   +0 53 32.2
 HV4452;UTM  18      - 4,307,888.830   320,467.618   MT  0.99999691   -1 18 01.8
 HV4452
 HV4452!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4452!SPC MD       -   1.00000506  x   0.99994995  =   0.99995501
 HV4452!SPC VA N     -   1.00000506  x   0.99996064  =   0.99996570
 HV4452!UTM  18      -   1.00000506  x   0.99999691  =   1.00000197
 HV4452
 HV4452:                Primary Azimuth Mark                     Grid Az
 HV4452:SPC MD       -  CRAMPTON                                 304 01 30.3
 HV4452:SPC VA N     -  CRAMPTON                                 303 05 19.1
 HV4452:UTM  18      -  CRAMPTON                                 305 16 53.1
 HV4452
 HV4452_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2046707888(NAD 83)
 HV4452
 HV4452|---------------------------------------------------------------------|
 HV4452| PID    Reference Object                     Distance      Geod. Az  |
 HV4452|                                                           dddmmss.s |
 HV4452| HV4195 BRIDGE                               22.813 METERS 01915     |
 HV4452| HV4457 WASHINGTON BASE 1 USE 1932          281.444 METERS 01957     |
 HV4452| HV4448 VIRGINIA BASE USE 1932               18.276 METERS 10956     |
 HV4452| HV4197 CRAMPTON                            APPROX. 0.7 KM 3035851.3 |
 HV4452|---------------------------------------------------------------------|
 HV4452
 HV4452                          SUPERSEDED SURVEY CONTROL
 HV4452
 HV4452  NAD 83(1991)-  38 54 05.57211(N)    077 04 13.28747(W) AD(       ) 2
 HV4452  NAD 83(1986)-  38 54 05.57192(N)    077 04 13.29768(W) AD(       ) 2
 HV4452  NAD 27      -  38 54 05.17200(N)    077 04 14.37000(W) AD(       ) 2
 HV4452
 HV4452.Superseded values are not recommended for survey control.
 HV4452
 HV4452.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4452.See file dsdata.pdf to determine how the superseded data were derived.
 HV4452
 HV4452
 HV4452  HISTORY     - Date     Condition        Report By
 HV4452  HISTORY     - 1932     MONUMENTED       CGS
 HV4452  HISTORY     - 1946     GOOD             CGS
 HV4452  HISTORY     - 1947     GOOD             CGS
 HV4452  HISTORY     - 1957     MARK NOT FOUND   CGS
 HV4452
 HV4452                          STATION DESCRIPTION
 HV4452
 HV4452'DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4452'STATION SITE IS ON THE KEY BRIDGE WHICH CONNECTS GEORGETOWN,
 HV4452'A SECTION IN THE DISTRICT OF COLUMBIA, WITH ROSSLYN IN VIRGINIA.
 HV4452'STATION IS A 1/4-INCH BRASS TUBE LEADED IN A 3/4-INCH DRILL
 HV4452'HOLE IN THE SIDEWALK OF THE UPSTREAM SIDE OF THE VIRGINIA
 HV4452'END OF KEY BRIDGE, AND 0.2 FOOT S OF THE CENTERLINE OF THE
 HV4452'SECOND PIER FROM THE ABUTMENT ON THE VIRGINIA SHORE
 HV4452'(BEING THE FIRST PIER IN THE RIVER), 5.30 FEET FROM THE
 HV4452'UPSTREAM GUARDRAIL, 4.95 FEET FROM UPSTREAM CURB, AND DIRECTLY
 HV4452'ACROSS THE BRIDGE FROM VIRGINIA BASE.
 HV4452
 HV4452                          STATION RECOVERY (1947)
 HV4452
 HV4452'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947 (EAD)
 HV4452'FOUND AS DESCRIBED.  A NEW DESCRIPTION FOLLOWS--ON THE UPSTREAM
 HV4452'SIDEWALK OF THE KEY BRIDGE AND OPPOSITE THE FIRST PIER OUT FROM
 HV4452'THE VIRGINIA SHORE OF THE NOW DISMANTLED BRIDGE JUST UPSTREAM
 HV4452'FROM KEY BRIDGE.  THE STATION IS A 1/4-INCH BRASS TUBE LEADED
 HV4452'INTO A 3/4-INCH HOLE IN THE SIDEWALK, 4.95 FEET FROM THE
 HV4452'CURB, 5.30 FEET FROM THE RAILING, 0.2 FOOT FROM THE CENTER
 HV4452'LINE OF THE SECOND PIER OUT FROM THE BRIDGE ABUTMENT ON THE
 HV4452'VIRGINIA SHORE, AND BETWEEN LAMPPOSTS 69 AND 71.
 HV4452
 HV4452                          STATION RECOVERY (1957)
 HV4452
 HV4452'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1957 (ROW)
 HV4452'VIRGINIA BASE
 HV4452'
 HV4452'VIRGINIA BASE 1
 HV4452'
 HV4452'BRIDGE 1924
 HV4452'
 HV4452'WASHINGTON BASE
 HV4452'
 HV4452'WASHINGTON BASE 1
 HV4452'
 HV4452'STATIONS DESTROYED.  THE ENTIRE SURFACE OF THE BRIDGE WAS
 HV4452'REBUILT DURING THE WINTER OF 1956-57.  A THIRD TRAFFIC LANE
 HV4452'WAS ADDED IN BOTH DIRECTIONS IN PLACE OF THE OLD SIDEWALKS.
 HV4452'NEW SIDEWALKS WERE PLACED BY EXTENDING THE WIDTH OF THE BRIDGE
 HV4452'ON BOTH SIDES APPARENTLY BY CANTILEVER BRACING.
 HV4452'
 HV4452'REPLACEMENT STATION WERE ESTABLISHED AND OBSERVATIONS TYING
 HV4452'THEM IN AND MADE BY THE U.S.G.B. AFTER THE BRIDGE WAS COMPLETED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4447 ***********************************************************************
 HV4447  DESIGNATION -  VIRGINIA BASE NO 1 USE 1956
 HV4447  PID         -  HV4447
 HV4447  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4447  COUNTRY     -  US
 HV4447  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4447
 HV4447                         *CURRENT SURVEY CONTROL
 HV4447  ______________________________________________________________________
 HV4447* NAD 83(1993) POSITION- 38 54 05.60742(N) 077 04 13.34552(W)   ADJUSTED
 HV4447* NAVD 88 ORTHO HEIGHT -    -0.    (meters)       -0.    (feet) SCALED
 HV4447  ______________________________________________________________________
 HV4447  GEOID HEIGHT    -        -32.020 (meters)                     GEOID18
 HV4447  LAPLACE CORR    -         -2.87  (seconds)                    DEFLEC18
 HV4447  HORZ ORDER      -  THIRD
 HV4447
 HV4447.The horizontal coordinates were established by classical geodetic methods
 HV4447.and adjusted by the National Geodetic Survey in November 1994.
 HV4447
 HV4447.The orthometric height was scaled from a topographic map.
 HV4447
 HV4447.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4447.GEOID18 height accuracy estimate available here.
 HV4447
 HV4447.Click photographs - Photos may exist for this station.
 HV4447
 HV4447.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4447
 HV4447. The following values were computed from the NAD 83(1993) position.
 HV4447
 HV4447;                    North         East     Units Scale Factor Converg.
 HV4447;SPC MD       -   137,080.562   393,895.642   MT  0.99994995   -0 02 39.0
 HV4447;SPC MD       -   449,738.48  1,292,305.95   sFT  0.99994995   -0 02 39.0
 HV4447;SPC VA N     - 2,138,038.637 3,624,004.912   MT  0.99996064   +0 53 32.1
 HV4447;SPC VA N     - 7,014,548.43 11,889,756.12   sFT  0.99996064   +0 53 32.1
 HV4447;UTM  18      - 4,307,889.913   320,466.206   MT  0.99999691   -1 18 01.8
 HV4447
 HV4447!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4447!SPC MD       -   1.00000506  x   0.99994995  =   0.99995501
 HV4447!SPC VA N     -   1.00000506  x   0.99996064  =   0.99996570
 HV4447!UTM  18      -   1.00000506  x   0.99999691  =   1.00000197
 HV4447
 HV4447:                Primary Azimuth Mark                     Grid Az
 HV4447:SPC MD       -  MAPLE POINT 147                          277 15 34.2
 HV4447:SPC VA N     -  MAPLE POINT 147                          276 19 23.1
 HV4447:UTM  18      -  MAPLE POINT 147                          278 30 57.0
 HV4447
 HV4447_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2046607889(NAD 83)
 HV4447
 HV4447|---------------------------------------------------------------------|
 HV4447| PID    Reference Object                     Distance      Geod. Az  |
 HV4447|                                                           dddmmss.s |
 HV4447| HV4451 WASHINGTON BASE NO 1 USE 1956       280.860 METERS 01954     |
 HV4447| HV2175 WASH BASE USE 1956                  281.747 METERS 02428     |
 HV4447| HV4449 VIRGINIA BASE USE 1956               22.068 METERS 10953     |
 HV4447| HV3620 MAPLE POINT 147                     APPROX. 0.7 KM 2771255.2 |
 HV4447|---------------------------------------------------------------------|
 HV4447
 HV4447                          SUPERSEDED SURVEY CONTROL
 HV4447
 HV4447  NAD 83(1991)-  38 54 05.60618(N)    077 04 13.34709(W) AD(       ) 3
 HV4447  NAD 83(1986)-  38 54 05.60590(N)    077 04 13.35705(W) AD(       ) 3
 HV4447  NAD 27      -  38 54 05.20600(N)    077 04 14.42800(W) AD(       ) 3
 HV4447
 HV4447.Superseded values are not recommended for survey control.
 HV4447
 HV4447.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4447.See file dsdata.pdf to determine how the superseded data were derived.
 HV4447
 HV4447_MARKER: DD = SURVEY DISK
 HV4447_SETTING: 0 = UNSPECIFIED SETTING
 HV4447_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4447
 HV4447  HISTORY     - Date     Condition        Report By
 HV4447  HISTORY     - 1956     MONUMENTED       USACE
 HV4447
 HV4447                          STATION DESCRIPTION
 HV4447
 HV4447'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1956
 HV4447'STATION IS LOCATED AT SOUTHWEST END OF KEY BRIDGE, SET FLUSH
 HV4447'IN SIDEWALK, 2.42 FEET W OF OUTER FACE OF WEST CURB, AND 120.02
 HV4447'FEET S OF SOUTH EDGE OF LIGHT POST 13, NEAR THE VIRGINIA END
 HV4447'OF BRIDGE ON THE UPSTREAM SIDE.  THE MARK IS A CORPS OF
 HV4447'ENGINEERS BRONZE DISC STAMPED VA BASE NO. 1 1956.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4448 ***********************************************************************
 HV4448  DESIGNATION -  VIRGINIA BASE USE 1932
 HV4448  PID         -  HV4448
 HV4448  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4448  COUNTRY     -  US
 HV4448  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4448
 HV4448                         *CURRENT SURVEY CONTROL
 HV4448  ______________________________________________________________________
 HV4448* NAD 83(1993) POSITION- 38 54 05.37127(N) 077 04 12.57289(W)   ADJUSTED
 HV4448* NAVD 88 ORTHO HEIGHT -    -0.    (meters)       -0.    (feet) SCALED
 HV4448  ______________________________________________________________________
 HV4448  GEOID HEIGHT    -        -32.021 (meters)                     GEOID18
 HV4448  LAPLACE CORR    -         -2.87  (seconds)                    DEFLEC18
 HV4448  HORZ ORDER      -  THIRD
 HV4448
 HV4448.The horizontal coordinates were established by classical geodetic methods
 HV4448.and adjusted by the National Geodetic Survey in November 1994.
 HV4448
 HV4448.The orthometric height was scaled from a topographic map.
 HV4448
 HV4448.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4448.GEOID18 height accuracy estimate available here.
 HV4448
 HV4448.Click photographs - Photos may exist for this station.
 HV4448
 HV4448.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4448
 HV4448. The following values were computed from the NAD 83(1993) position.
 HV4448
 HV4448;                    North         East     Units Scale Factor Converg.
 HV4448;SPC MD       -   137,073.266   393,914.253   MT  0.99994995   -0 02 38.5
 HV4448;SPC MD       -   449,714.54  1,292,367.01   sFT  0.99994995   -0 02 38.5
 HV4448;SPC VA N     - 2,138,031.646 3,624,023.640   MT  0.99996064   +0 53 32.6
 HV4448;SPC VA N     - 7,014,525.49 11,889,817.56   sFT  0.99996064   +0 53 32.6
 HV4448;UTM  18      - 4,307,882.210   320,484.653   MT  0.99999683   -1 18 01.3
 HV4448
 HV4448!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4448!SPC MD       -   1.00000506  x   0.99994995  =   0.99995501
 HV4448!SPC VA N     -   1.00000506  x   0.99996064  =   0.99996570
 HV4448!UTM  18      -   1.00000506  x   0.99999683  =   1.00000189
 HV4448
 HV4448:                Primary Azimuth Mark                     Grid Az
 HV4448:SPC MD       -  BARREL                                   076 07 06.2
 HV4448:SPC VA N     -  BARREL                                   075 10 55.1
 HV4448:UTM  18      -  BARREL                                   077 22 29.0
 HV4448
 HV4448_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2048407882(NAD 83)
 HV4448
 HV4448|---------------------------------------------------------------------|
 HV4448| PID    Reference Object                     Distance      Geod. Az  |
 HV4448|                                                           dddmmss.s |
 HV4448| HV4458 WASHINGTON BASE USE 1932            281.480 METERS 01958     |
 HV4448| HV4224 BARREL                              461.381 METERS 0760427.7 |
 HV4448| HV4207 DAM                                 360.966 METERS 12248     |
 HV4448| HV4452 VIRGINIA BASE 1 USE 1932             18.276 METERS 28956     |
 HV4448|---------------------------------------------------------------------|
 HV4448
 HV4448                          SUPERSEDED SURVEY CONTROL
 HV4448
 HV4448  NAD 83(1991)-  38 54 05.37003(N)    077 04 12.57446(W) AD(       ) 3
 HV4448  NAD 83(1986)-  38 54 05.36978(N)    077 04 12.58450(W) AD(       ) 3
 HV4448  NAD 27      -  38 54 04.97000(N)    077 04 13.65700(W) AD(       ) 3
 HV4448
 HV4448.Superseded values are not recommended for survey control.
 HV4448
 HV4448.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4448.See file dsdata.pdf to determine how the superseded data were derived.
 HV4448
 HV4448
 HV4448  HISTORY     - Date     Condition        Report By
 HV4448  HISTORY     - 1932     MONUMENTED       CGS
 HV4448  HISTORY     - 1946     GOOD             CGS
 HV4448  HISTORY     - 1946     GOOD             CGS
 HV4448  HISTORY     - 1947     GOOD             CGS
 HV4448  HISTORY     - 1957     SEE DESCRIPTION  CGS
 HV4448
 HV4448                          STATION DESCRIPTION
 HV4448
 HV4448'DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4448'STATION SITE IS ON THE KEY BRIDGE WHICH CONNECTS A SECTION
 HV4448'OF THE DISTRICT OF COLUMBIA KNOWN AS GEORGETOWN WITH A SECTION
 HV4448'OF VIRGINIA CALLED ROSSLYN.  STATION IS A 1/4-INCH BRASS
 HV4448'TUBE LEADED IN A 3/4-INCH DRILL HOLE IN THE BRIDGE SIDEWALK
 HV4448'ON THE DOWNSTREAM SIDE OF THE VIRGINIA END OF THE BRIDGE,
 HV4448'IN THE CENTER LINE OF THE SECOND PIER FROM THE ABUTMENT
 HV4448'OF THE VIRGINIA SHORE (THE FIRST PIER IN THE WATER), AND 5.2
 HV4448'FEET UPSTREAM FROM THE DOWNSTREAM GUARDRAIL, 4.96 FEET
 HV4448'DOWNSTREAM FROM THE CURB, AND DOWNSTREAM ACROSS THE BRIDGE
 HV4448'FROM VIRGINIA BASE 1.
 HV4448
 HV4448                          STATION RECOVERY (1946)
 HV4448
 HV4448'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (CRR)
 HV4448'THE STATION WAS RECOVERED AS DESCRIBED.  NO OLD DISTANCES
 HV4448'OR DIRECTIONS WERE TAKEN AT THIS TIME.  A COMPLETE NEW
 HV4448'DESCRIPTION FOLLOWS--THE STATION IS LOCATED ON THE KEY BRIDGE
 HV4448'DIRECTLY OVER THE FIRST VIRGINIA PIER.  IT IS ON THE DOWNSTREAM
 HV4448'SIDE OF THE BRIDGE, 4.95 FEET FROM THE CURB, 4.96 FEET FROM
 HV4448'THE RAILING AND 0.2 FOOT N OF THE CENTER LINE OF THE FIRST
 HV4448'VIRGINIA PIER.  THE MARK IS A 1/4-INCH BRASS ROD LEADED IN A
 HV4448'3/4-INCH DRILL HOLE IN THE CONCRETE SIDEWALK.
 HV4448
 HV4448                          STATION RECOVERY (1947)
 HV4448
 HV4448'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947 (EAD)
 HV4448'FOUND AS DESCRIBED.  A NEW DESCRIPTION FOLLOWS--ON THE DOWNSTREAM
 HV4448'SIDEWALK OF THE KEY BRIDGE.  THE STATION IS A 1/4-INCH BRASS
 HV4448'TUBE LEADED INTO A 3/4-INCH HOLE IN THE SIDEWALK 4.96 FEET
 HV4448'FROM THE CURB, 5.20 FEET FROM THE RAILING, CLOSE TO THE CENTER
 HV4448'LINE OF THE BRIDGE PIER, AND BETWEEN LAMPPOSTS 70 AND 72.
 HV4448'THIS IS THE SECOND PIER OUT FROM THE BRIDGE ABUTMENT ON THE
 HV4448'VIRGINIA SHORE.
 HV4448
 HV4448                          STATION RECOVERY (1957)
 HV4448
 HV4448'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1957 (ROW)
 HV4448'VIRGINIA BASE
 HV4448'
 HV4448'VIRGINIA BASE 1
 HV4448'
 HV4448'BRIDGE 1924
 HV4448'
 HV4448'WASHINGTON BASE
 HV4448'
 HV4448'WASHINGTON BASE 1
 HV4448'
 HV4448'STATIONS DESTROYED.  THE ENTIRE SURFACE OF THE BRIDGE WAS
 HV4448'REBUILT DURING THE WINTER OF 1956-57.  A THIRD TRAFFIC LANE
 HV4448'WAS ADDED IN BOTH DIRECTIONS IN PLACE OF THE OLD SIDEWALKS.
 HV4448'NEW SIDEWALKS WERE PLACED BY EXTENDING THE WIDTH OF THE BRIDGE
 HV4448'ON BOTH SIDES APPARENTLY BY CANTILEVER BRACING.
 HV4448'
 HV4448'REPLACEMENT STATIONS WERE ESTABLSIHED AND OBSERVATIONS TYING
 HV4448'THEM IN WERE MADE BY THE U.S.E.D. AFTER BRIDGE WAS COMPLETED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4449 ***********************************************************************
 HV4449  DESIGNATION -  VIRGINIA BASE USE 1956
 HV4449  PID         -  HV4449
 HV4449  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4449  COUNTRY     -  US
 HV4449  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4449
 HV4449                         *CURRENT SURVEY CONTROL
 HV4449  ______________________________________________________________________
 HV4449* NAD 83(1993) POSITION- 38 54 05.36394(N) 077 04 12.48431(W)   ADJUSTED
 HV4449* NAVD 88 ORTHO HEIGHT -    -0.    (meters)       -0.    (feet) SCALED
 HV4449  ______________________________________________________________________
 HV4449  GEOID HEIGHT    -        -32.021 (meters)                     GEOID18
 HV4449  LAPLACE CORR    -         -2.87  (seconds)                    DEFLEC18
 HV4449  HORZ ORDER      -  THIRD
 HV4449
 HV4449.The horizontal coordinates were established by classical geodetic methods
 HV4449.and adjusted by the National Geodetic Survey in November 1994.
 HV4449
 HV4449.The orthometric height was scaled from a topographic map.
 HV4449
 HV4449.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4449.GEOID18 height accuracy estimate available here.
 HV4449
 HV4449.Click photographs - Photos may exist for this station.
 HV4449
 HV4449.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4449
 HV4449. The following values were computed from the NAD 83(1993) position.
 HV4449
 HV4449;                    North         East     Units Scale Factor Converg.
 HV4449;SPC MD       -   137,073.038   393,916.387   MT  0.99994995   -0 02 38.5
 HV4449;SPC MD       -   449,713.79  1,292,374.01   sFT  0.99994995   -0 02 38.5
 HV4449;SPC VA N     - 2,138,031.453 3,624,025.777   MT  0.99996064   +0 53 32.7
 HV4449;SPC VA N     - 7,014,524.86 11,889,824.57   sFT  0.99996064   +0 53 32.7
 HV4449;UTM  18      - 4,307,881.935   320,486.782   MT  0.99999682   -1 18 01.3
 HV4449
 HV4449!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4449!SPC MD       -   1.00000506  x   0.99994995  =   0.99995501
 HV4449!SPC VA N     -   1.00000506  x   0.99996064  =   0.99996570
 HV4449!UTM  18      -   1.00000506  x   0.99999682  =   1.00000188
 HV4449
 HV4449:                Primary Azimuth Mark                     Grid Az
 HV4449:SPC MD       -  BARREL                                   076 01 37.1
 HV4449:SPC VA N     -  BARREL                                   075 05 25.9
 HV4449:UTM  18      -  BARREL                                   077 16 59.9
 HV4449
 HV4449_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2048607881(NAD 83)
 HV4449
 HV4449|---------------------------------------------------------------------|
 HV4449| PID    Reference Object                     Distance      Geod. Az  |
 HV4449|                                                           dddmmss.s |
 HV4449| HV4451 WASHINGTON BASE NO 1 USE 1956       281.720 METERS 01525     |
 HV4449| HV2175 WASH BASE USE 1956                  280.848 METERS 01959     |
 HV4449| HV4224 BARREL                              459.365 METERS 0755858.6 |
 HV4449| HV4535 DAM USE 1926 REF                    378.477 METERS 12313     |
 HV4449| HV4447 VIRGINIA BASE NO 1 USE 1956          22.068 METERS 28953     |
 HV4449|---------------------------------------------------------------------|
 HV4449
 HV4449                          SUPERSEDED SURVEY CONTROL
 HV4449
 HV4449  NAD 83(1991)-  38 54 05.36270(N)    077 04 12.48587(W) AD(       ) 3
 HV4449  NAD 83(1986)-  38 54 05.36243(N)    077 04 12.49586(W) AD(       ) 3
 HV4449  NAD 27      -  38 54 04.96200(N)    077 04 13.56700(W) AD(       ) 3
 HV4449
 HV4449.Superseded values are not recommended for survey control.
 HV4449
 HV4449.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4449.See file dsdata.pdf to determine how the superseded data were derived.
 HV4449
 HV4449_MARKER: DD = SURVEY DISK
 HV4449_SETTING: 0 = UNSPECIFIED SETTING
 HV4449_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4449
 HV4449  HISTORY     - Date     Condition        Report By
 HV4449  HISTORY     - 1956     MONUMENTED       USACE
 HV4449  HISTORY     - 1974     GOOD             NGS
 HV4449
 HV4449                          STATION DESCRIPTION
 HV4449
 HV4449'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1956
 HV4449'STATION IS LOCATED AT SOUTHEAST END OF KEY BRIDGE, SET FLUSH
 HV4449'IN SIDEWALK, 3.72 FEET EAST OF OUTER FACE OF EAST CURB ON
 HV4449'DOWNSTREAM SIDE OF BRIDGE AND 6.85 FEET N OF NORTH FACE OF
 HV4449'LIGHT POST 16 NEAR VIRGINIA END OF BRIDGE.  THE MARK IS A CORPS
 HV4449'OF ENGINEERS BRONZE DISC STAMPED VA BASE 1956.
 HV4449
 HV4449                          STATION RECOVERY (1974)
 HV4449
 HV4449'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974 (GWJ)
 HV4449'STATION RECOVERED AS DESCRIBED BY USE 1956.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1823 ***********************************************************************
 HV1823  DESIGNATION -  VOIR
 HV1823  PID         -  HV1823
 HV1823  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1823  COUNTRY     -  US
 HV1823  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1823
 HV1823                         *CURRENT SURVEY CONTROL
 HV1823  ______________________________________________________________________
 HV1823* NAD 83(1993) POSITION- 38 54 34.43291(N) 077 05 29.20590(W)   ADJUSTED
 HV1823* NAVD 88 ORTHO HEIGHT -    45.55  (+/-2cm)      149.4   (feet) VERTCON3
 HV1823  ______________________________________________________________________
 HV1823  GEOID HEIGHT    -        -31.976 (meters)                     GEOID18
 HV1823  LAPLACE CORR    -         -2.58  (seconds)                    DEFLEC18
 HV1823  HORZ ORDER      -  SECOND
 HV1823  VERT ORDER      -  ? (See Below)
 HV1823
 HV1823.The horizontal coordinates were established by classical geodetic methods
 HV1823.and adjusted by the National Geodetic Survey in November 1994.
 HV1823
 HV1823.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1823.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1823
 HV1823.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1823.GEOID18 height accuracy estimate available here.
 HV1823
 HV1823.The vertical order pertains to the NGVD 29 superseded value.
 HV1823
 HV1823.Click photographs - Photos may exist for this station.
 HV1823
 HV1823.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1823
 HV1823. The following values were computed from the NAD 83(1993) position.
 HV1823
 HV1823;                    North         East     Units Scale Factor Converg.
 HV1823;SPC MD       -   137,971.033   392,068.678   MT  0.99995002   -0 03 26.6
 HV1823;SPC MD       -   452,659.96  1,286,311.99   sFT  0.99995002   -0 03 26.6
 HV1823;SPC VA N     - 2,138,899.139 3,622,163.618   MT  0.99996134   +0 52 44.8
 HV1823;SPC VA N     - 7,017,371.59 11,883,715.14   sFT  0.99996134   +0 52 44.8
 HV1823;UTM  18      - 4,308,820.278   318,659.115   MT  1.00000494   -1 18 50.3
 HV1823
 HV1823!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1823!SPC MD       -   0.99999787  x   0.99995002  =   0.99994789
 HV1823!SPC VA N     -   0.99999787  x   0.99996134  =   0.99995921
 HV1823!UTM  18      -   0.99999787  x   1.00000494  =   1.00000281
 HV1823
 HV1823:                Primary Azimuth Mark                     Grid Az
 HV1823:SPC MD       -  CAMP                                     176 51 46.4
 HV1823:SPC VA N     -  CAMP                                     175 55 35.0
 HV1823:UTM  18      -  CAMP                                     178 07 10.1
 HV1823
 HV1823_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1865908820(NAD 83)
 HV1823
 HV1823|---------------------------------------------------------------------|
 HV1823| PID    Reference Object                     Distance      Geod. Az  |
 HV1823|                                                           dddmmss.s |
 HV1823| HV4376 UP                                  396.780 METERS 04413     |
 HV1823| HV0308 CAMP                                APPROX. 0.5 KM 1764819.8 |
 HV1823| HV1182 LEDGE                               474.450 METERS 2392826.9 |
 HV1823| HV1824 RES                                 448.330 METERS 3134627.9 |
 HV1823| HV3993 CATHOLIC CHURCH SPIRE               APPROX. 0.8 KM 3380636.9 |
 HV1823|---------------------------------------------------------------------|
 HV1823
 HV1823                          SUPERSEDED SURVEY CONTROL
 HV1823
 HV1823  NAD 83(1991)-  38 54 34.43170(N)    077 05 29.20752(W) AD(       ) 2
 HV1823  NAD 83(1986)-  38 54 34.43155(N)    077 05 29.21747(W) AD(       ) 2
 HV1823  NAD 27      -  38 54 34.03100(N)    077 05 30.28900(W) AD(       ) 2
 HV1823  USSD        -  38 54 34.36800(N)    077 05 30.12300(W) AD(       ) 3
 HV1823  NGVD 29              45.77   (m)          150.2    (f) LEVELING    3  
 HV1823  NGVD 29 (11/26/84)   45.774  (m)          150.18   (f) ADJUSTED       
 HV1823
 HV1823.Superseded values are not recommended for survey control.
 HV1823
 HV1823.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1823.See file dsdata.pdf to determine how the superseded data were derived.
 HV1823
 HV1823_MARKER: DS = TRIANGULATION STATION DISK
 HV1823_SETTING: 80 = SET IN A BOULDER
 HV1823_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1823+STABILITY: SURFACE MOTION
 HV1823
 HV1823  HISTORY     - Date     Condition        Report By
 HV1823  HISTORY     - 1913     MONUMENTED       CGS
 HV1823  HISTORY     - 1925     GOOD             CGS
 HV1823  HISTORY     - 1925     GOOD             CGS
 HV1823  HISTORY     - 1940     GOOD             CGS
 HV1823  HISTORY     - 1946     GOOD             CGS
 HV1823  HISTORY     - 1947     GOOD             CGS
 HV1823  HISTORY     - 1972     MARK NOT FOUND   NGS
 HV1823
 HV1823                          STATION DESCRIPTION
 HV1823
 HV1823'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV1823'STATION IS NEAR THE S CORNER OF THE TWIN RESERVOIR IN GEORGETOWN.
 HV1823'IT IS JUST WITHIN THE FENCE BEING 2.25 METERS NW OF THE SE
 HV1823'FENCE AND 2.55 METERS NE OF THE SW FENCE.  THIS FENCE IS MADE
 HV1823'OF WOVEN WIRE FASTENED TO IRON POSTS SET IN CONCRETE POSTS,
 HV1823'AND EXTENDS AROUND THREE SIDES OF THE RESERVOIR ON THE TOP OF
 HV1823'THE BANK.
 HV1823'
 HV1823'THE STATION IS MARKED BY A SUBSURFACE MARK AND ALSO A SURFACE
 HV1823'MARK.  THE FORMER CONSISTS OF A 3/4-INCH DRILL HOLE SURROUNDED
 HV1823'BY A TRIANGLE CUT IN THE TOP OF A LARGE BOULDER SET WITH
 HV1823'TOP SOME 15 INCHES BELOW THE SURFACE OF THE GROUND.  THE SURFACE
 HV1823'MARK IS A REGULAR C. AND G.S. STATION MARK SET IN A LARGE
 HV1823'BOULDER FLUSH WITH THE SURFACE OF THE GROUND.
 HV1823
 HV1823                          STATION RECOVERY (1925)
 HV1823
 HV1823'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1925 (GLB)
 HV1823'STATION FOUND AS DESCRIBED.
 HV1823
 HV1823                          STATION RECOVERY (1925)
 HV1823
 HV1823'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1925
 HV1823'AT WASHINGTON.
 HV1823'AT WASHINGTON, ON MAC ARTHUR BOULEVARD NORTHWEST, AT THE SOUTH
 HV1823'CORNER OF THE TWIN-RESERVOIR GROUNDS, HALFWAY BETWEEN THE FENCE
 HV1823'CORNER AND THE CORNER OF THE ROCK REVETMENT OF THE RESERVOIR
 HV1823'BASIN, 20 FEET NORTH OF THE SOUTH EDGE OF THE BANK, 20 FEET EAST OF
 HV1823'THE WEST EDGE OF THE BANK, AND IN THE TOP OF A LARGE BOULDER FLUSH
 HV1823'WITH THE GROUND.  A STANDARD TRIANGULATION-STATION DISK.
 HV1823
 HV1823                          STATION RECOVERY (1940)
 HV1823
 HV1823'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV1823'STATION WAS RECOVERED.  THE ORIGINAL DESCRIPTION IS CORRECT
 HV1823'EXCEPT FOR REFERENCES TO THE FENCE WHICH HAS SINCE BEEN
 HV1823'REBUILT.  THE MARK IS FLUSH WITH THE GROUND SURFACE.  THE
 HV1823'STATION DISK IS UNSTAMPED AND EXTENDS SLIGHTLY ABOVE THE SURFACE
 HV1823'OF THE ROCK IN WHICH IT IS SET.
 HV1823'
 HV1823'THE STATION IS IN THE S CORNER OF THE DISTRIBUTING RESERVOIR,
 HV1823'IN A GRASSY PLOT INSIDE THE ANGLE FORMED BY THE FENCE CORNER.
 HV1823'IT IS ABOUT ON THE BISECTRIX OF THIS ANGLE, AND ABOUT
 HV1823'HALFWAY BETWEEN THE FENCE CORNER AND THE CORNER OF THE ROCK
 HV1823'REVETMENT OF THE RESERVOIR BASIN.  MARK IS 3.4 METERS NE
 HV1823'OF SW FENCE AND 3.1 METERS NW OF SE FENCE (MEASUREMENTS TAKEN
 HV1823'FROM THE WIRE, WHICH IS HUNG ON THE OUTSIDE OF THE CONCRETE
 HV1823'POSTS.)
 HV1823
 HV1823                          STATION RECOVERY (1946)
 HV1823
 HV1823'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV1823'FENCE HAS BEEN MOVED ABOUT 75 FEET OUTWARD FROM RESERVOIR.
 HV1823'STATION IS 20 FEET N OF THE S EDGE OF THE TOP OF THE BANK,
 HV1823'AND 20 FEET E OF THE W EDGE OF THE TOP OF THE BANK.  OTHERWISE,
 HV1823'AS DESCRIBED.  STATION IS IN GOOD CONDITION.
 HV1823
 HV1823                          STATION RECOVERY (1947)
 HV1823
 HV1823'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947
 HV1823'RECOVERED IN GOOD CONDITION.
 HV1823
 HV1823                          STATION RECOVERY (1972)
 HV1823
 HV1823'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1972 (RDO)
 HV1823'THE STATION WAS SEARCHED FOR BUT NOT RECOVERED.  A COMPACTED
 HV1823'LAYER OF NEW ROAD GRAVEL SEEMS TO HAVE COVERED THE STATION AND
 HV1823'RENDERS DIGGING FOR IT DIFFICULT, THOUGH EVIDENCE DOES NOT
 HV1823'NECESSARILY INDICATE THAT THE STATION MAY BE DESTROYED.
 HV1823'
 HV1823'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV1823'IN D.C.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2025 ***********************************************************************
 HV2025  DESIGNATION -  W 1
 HV2025  PID         -  HV2025
 HV2025  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2025  COUNTRY     -  US
 HV2025  USGS QUAD   -  ALEXANDRIA (2019)
 HV2025
 HV2025                         *CURRENT SURVEY CONTROL
 HV2025  ______________________________________________________________________
 HV2025* NAD 83(1986) POSITION- 38 49 19.     (N) 077 01 35.     (W)   SCALED
 HV2025* NAVD 88 ORTHO HEIGHT -     6.787 (meters)       22.27  (feet) POSTED
 HV2025  ______________________________________________________________________
 HV2025  GEOID HEIGHT    -        -32.217 (meters)                     GEOID18
 HV2025  DYNAMIC HEIGHT  -          6.78  (meters)       22.2   (feet) COMP
 HV2025  MODELED GRAVITY -    980,091.0   (mgal)                       NAVD 88
 HV2025
 HV2025  VERT ORDER      -  * POSTED, SEE BELOW
 HV2025
 HV2025.The horizontal coordinates were scaled from a map and have
 HV2025.an estimated accuracy of +/- 6 seconds.
 HV2025
 HV2025.The orthometric height was determined by differential leveling
 HV2025.and adjusted by the NATIONAL GEODETIC SURVEY in 1992.
 HV2025
 HV2025.* This is a POSTED BENCH MARK height.
 HV2025
 HV2025.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2025.GEOID18 height accuracy estimate available here.
 HV2025
 HV2025.Click photographs - Photos may exist for this station.
 HV2025
 HV2025.The dynamic height is computed by dividing the NAVD 88
 HV2025.geopotential number by the normal gravity value computed on the
 HV2025.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2025.degrees latitude (g = 980.6199 gals.).
 HV2025
 HV2025.The modeled gravity was interpolated from observed gravity values.
 HV2025
 HV2025
 HV2025_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH240989(NAD 83)
 HV2025
 HV2025                          SUPERSEDED SURVEY CONTROL
 HV2025
 HV2025  NGVD 29 (11/26/84)    7.028  (m)           23.06   (f) ADJUSTED    1 2
 HV2025
 HV2025.Superseded values are not recommended for survey control.
 HV2025
 HV2025.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2025.See file dsdata.pdf to determine how the superseded data were derived.
 HV2025
 HV2025_MARKER: DB = BENCH MARK DISK
 HV2025_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2025_SP_SET: CONCRETE SHOULDER
 HV2025_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2025
 HV2025  HISTORY     - Date     Condition        Report By
 HV2025  HISTORY     - UNK      MONUMENTED       CGS
 HV2025  HISTORY     - 1931     GOOD             CGS
 HV2025
 HV2025                          STATION DESCRIPTION
 HV2025
 HV2025'DESCRIBED BY COAST AND GEODETIC SURVEY 1931
 HV2025'AT BELLEVUE.
 HV2025'MARK IS LOCATED IN A CONCRETE SHOUDER AT THE EAST SIDE OF THE
 HV2025'STEPS AT THE MAIN ENTRANCE OF THE OFFICES OF THE U.S. NAVAL
 HV2025'RESEARCH LABORATORY, MAIN ENTRANCE IS ON THE SOUTH SIDE OF THE
 HV2025'BUILDING, AND THE MARK IS ABOUT 2 1/2 FEET ABOVE THE SIDEWALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2026 ***********************************************************************
 HV2026  DESIGNATION -  W 1 RESET 1943
 HV2026  PID         -  HV2026
 HV2026  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2026  COUNTRY     -  US
 HV2026  USGS QUAD   -  ALEXANDRIA (2019)
 HV2026
 HV2026                         *CURRENT SURVEY CONTROL
 HV2026  ______________________________________________________________________
 HV2026* NAD 83(1986) POSITION- 38 49 20.     (N) 077 01 36.     (W)   SCALED
 HV2026* NAVD 88 ORTHO HEIGHT -     6.773 (meters)       22.22  (feet) ADJUSTED
 HV2026  ______________________________________________________________________
 HV2026  GEOID HEIGHT    -        -32.216 (meters)                     GEOID18
 HV2026  DYNAMIC HEIGHT  -          6.769 (meters)       22.21  (feet) COMP
 HV2026  MODELED GRAVITY -    980,091.0   (mgal)                       NAVD 88
 HV2026
 HV2026  VERT ORDER      -  FIRST     CLASS II
 HV2026
 HV2026.The horizontal coordinates were scaled from a map and have
 HV2026.an estimated accuracy of +/- 6 seconds.
 HV2026
 HV2026.The orthometric height was determined by differential leveling and
 HV2026.adjusted by the NATIONAL GEODETIC SURVEY
 HV2026.in June 1991.
 HV2026
 HV2026.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2026.GEOID18 height accuracy estimate available here.
 HV2026
 HV2026.Click photographs - Photos may exist for this station.
 HV2026
 HV2026.The dynamic height is computed by dividing the NAVD 88
 HV2026.geopotential number by the normal gravity value computed on the
 HV2026.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2026.degrees latitude (g = 980.6199 gals.).
 HV2026
 HV2026.The modeled gravity was interpolated from observed gravity values.
 HV2026
 HV2026
 HV2026_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH240989(NAD 83)
 HV2026
 HV2026                          SUPERSEDED SURVEY CONTROL
 HV2026
 HV2026  NGVD 29 (11/26/84)    7.038  (m)           23.09   (f) ADJUSTED    1 2
 HV2026
 HV2026.Superseded values are not recommended for survey control.
 HV2026
 HV2026.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2026.See file dsdata.pdf to determine how the superseded data were derived.
 HV2026
 HV2026_MARKER: DB = BENCH MARK DISK
 HV2026_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2026_SP_SET: CONCRETE SHOULDER
 HV2026_STAMPING: 23 W 1 RESET 1943
 HV2026_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2026
 HV2026  HISTORY     - Date     Condition        Report By
 HV2026  HISTORY     - 1943     MONUMENTED       DOD
 HV2026  HISTORY     - 1944     GOOD             CGS
 HV2026
 HV2026                          STATION DESCRIPTION
 HV2026
 HV2026'DESCRIBED BY COAST AND GEODETIC SURVEY 1944
 HV2026'AT WASHINGTON.
 HV2026'AT WASHINGTON, AT THE NAVAL RESEARCH LABORATORY AT BELLEVUE,
 HV2026'ON THE SOUTH SIDE OF THE RADIO AND SOUNDS LABORATORY (BUILDING 1),
 HV2026'AT THE MAIN ENTRANCE, IN THE CONCRETE SHOULDER AT THE WEST
 HV2026'SIDE OF THE STEPS, AND ABOUT 3 FEET ABOVE THE SIDEWALK.  A
 HV2026'STANDARD DISK, STAMPED 23 W 1 RESET 1943.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8036 ***********************************************************************
 HV8036  DESIGNATION -  W 2
 HV8036  PID         -  HV8036
 HV8036  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8036  COUNTRY     -  US
 HV8036  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8036
 HV8036                         *CURRENT SURVEY CONTROL
 HV8036  ______________________________________________________________________
 HV8036* NAD 83(1986) POSITION- 38 53 52.     (N) 077 02 15.     (W)   SCALED
 HV8036* NAVD 88 ORTHO HEIGHT -    17.983 (meters)       59.00  (feet) ADJUSTED
 HV8036  ______________________________________________________________________
 HV8036  GEOID HEIGHT    -        -32.069 (meters)                     GEOID18
 HV8036  DYNAMIC HEIGHT  -         17.973 (meters)       58.97  (feet) COMP
 HV8036  MODELED GRAVITY -    980,097.6   (mgal)                       NAVD 88
 HV8036
 HV8036  VERT ORDER      -  FIRST     CLASS 0
 HV8036
 HV8036.The horizontal coordinates were scaled from a map and have
 HV8036.an estimated accuracy of +/- 6 seconds.
 HV8036
 HV8036.The orthometric height was determined by differential leveling and
 HV8036.adjusted by the NATIONAL GEODETIC SURVEY
 HV8036.in June 1991.
 HV8036
 HV8036.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8036.GEOID18 height accuracy estimate available here.
 HV8036
 HV8036.Click photographs - Photos may exist for this station.
 HV8036
 HV8036.The dynamic height is computed by dividing the NAVD 88
 HV8036.geopotential number by the normal gravity value computed on the
 HV8036.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8036.degrees latitude (g = 980.6199 gals.).
 HV8036
 HV8036.The modeled gravity was interpolated from observed gravity values.
 HV8036
 HV8036
 HV8036_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ233074(NAD 83)
 HV8036
 HV8036                          SUPERSEDED SURVEY CONTROL
 HV8036
 HV8036  NGVD 29 (??/??/92)   18.218  (m)           59.77   (f) ADJ UNCH    1 0
 HV8036
 HV8036.Superseded values are not recommended for survey control.
 HV8036
 HV8036.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8036.See file dsdata.pdf to determine how the superseded data were derived.
 HV8036
 HV8036_MARKER: DB = BENCH MARK DISK
 HV8036_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV8036_STAMPING: W 2 1949
 HV8036_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV8036+STABILITY: SURFACE MOTION
 HV8036
 HV8036  HISTORY     - Date     Condition        Report By
 HV8036  HISTORY     - 1949     MONUMENTED       CGS
 HV8036
 HV8036                          STATION DESCRIPTION
 HV8036
 HV8036'DESCRIBED BY COAST AND GEODETIC SURVEY 1949
 HV8036'IN WASHINGTON DC.
 HV8036'AT WASHINGTON, D.C. ON THE WHITE HOUSE GROUNDS, ABOUT 150 FEET N 15
 HV8036'DEGREE WEST FROM THE NORTHWEST CORNER OF THE WHITE HOUSE, 46.2 FEET
 HV8036'SOUTHWEST OF THE CENTER OF THE FOURTH TREE (24 INCH IN 1952) NORTH OF
 HV8036'THE DRIVEWAY, 44.0 FEET NORTHWEST OF THE CENTER OF THE SECOND TREE
 HV8036'(20 INCH IN 1952) NORTH OF THE DRIVEWAY, 32.5 FEET WEST- NORTHWEST OF
 HV8036'THE THIRD TREE (22 INCH IN 1952) NORTH OF THE DRIVEWAY, AND JUST
 HV8036'ABOUT FLUSH WITH THE SURFACE OF THE GROUND. A BRASS DISK, STAMPED 'W
 HV8036'2 1949' AND SET IN THE TOP OF A CONCRETE POST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI4425 ***********************************************************************
 AI4425  DESIGNATION -  W M BASE NE
 AI4425  PID         -  AI4425
 AI4425  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI4425  COUNTRY     -  US
 AI4425  USGS QUAD   -  WASHINGTON WEST (2016)
 AI4425
 AI4425                         *CURRENT SURVEY CONTROL
 AI4425  ______________________________________________________________________
 AI4425* NAD 83(1986) POSITION- 38 53 22.30   (N) 077 02 06.57   (W)   HD_HELD1
 AI4425* NAVD 88 ORTHO HEIGHT -    12.082 (meters)       39.64  (feet) ADJUSTED
 AI4425  ______________________________________________________________________
 AI4425  GEOID HEIGHT    -        -32.088 (meters)                     GEOID18
 AI4425  DYNAMIC HEIGHT  -         12.075 (meters)       39.62  (feet) COMP
 AI4425  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 AI4425
 AI4425  VERT ORDER      -  FIRST     CLASS II
 AI4425
 AI4425.The horizontal coordinates were determined by differentially corrected
 AI4425.hand held GPS observations or other comparable positioning techniques
 AI4425.and have an estimated accuracy of +/- 3 meters.
 AI4425
 AI4425.The orthometric height was determined by differential leveling and
 AI4425.adjusted by the NATIONAL GEODETIC SURVEY
 AI4425.in February 2015.
 AI4425
 AI4425.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI4425.GEOID18 height accuracy estimate available here.
 AI4425
 AI4425.Click photographs - Photos may exist for this station.
 AI4425
 AI4425.The dynamic height is computed by dividing the NAVD 88
 AI4425.geopotential number by the normal gravity value computed on the
 AI4425.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AI4425.degrees latitude (g = 980.6199 gals.).
 AI4425
 AI4425.The modeled gravity was interpolated from observed gravity values.
 AI4425
 AI4425
 AI4425_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2349006486(NAD 83)
 AI4425
 AI4425                          SUPERSEDED SURVEY CONTROL
 AI4425
 AI4425  NAVD 88 (04/25/01)   12.062  (m)           39.57   (f) SUPERSEDED  1 2
 AI4425  NAVD 88 (04/19/00)   12.063  (m)           39.58   (f) SUPERSEDED  1 2
 AI4425
 AI4425.Superseded values are not recommended for survey control.
 AI4425
 AI4425.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AI4425.See file dsdata.pdf to determine how the superseded data were derived.
 AI4425
 AI4425_MARKER: Z = SEE DESCRIPTION
 AI4425_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 AI4425_SP_SET: IRON BAR
 AI4425_MARK LOGO: NONE
 AI4425_MAGNETIC: N = NO MAGNETIC MATERIAL
 AI4425_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AI4425+STABILITY: SURFACE MOTION
 AI4425
 AI4425  HISTORY     - Date     Condition        Report By
 AI4425  HISTORY     - UNK      MONUMENTED       NONE
 AI4425  HISTORY     - 19991110 GOOD             NGS
 AI4425  HISTORY     - 20000510 GOOD             NGS
 AI4425  HISTORY     - 20120301 MARK NOT FOUND   NGS
 AI4425  HISTORY     - 20140408 POOR             NGS
 AI4425
 AI4425                          STATION DESCRIPTION
 AI4425
 AI4425'DESCRIBED BY NATIONAL GEODETIC SURVEY 1999 (RWA)
 AI4425'IN WASHINGTON DC, AT THE WASHINGTON MONUMENT, AT THE NORTHEAST CORNER
 AI4425'OF THE WASHINGTON MONUMENT, AN IRON BAR SET IN THE FOUNDATION OF THE
 AI4425'MONUMENT WALL, 7 INCHES SOUTH OF NORTH SIDE ON EAST WALL AND 7 INCHES
 AI4425'BELOW THE SURFACE.
 AI4425
 AI4425                          STATION RECOVERY (2000)
 AI4425
 AI4425'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 AI4425'RECOVERED AS DESCRIBED.
 AI4425
 AI4425                          STATION RECOVERY (2012)
 AI4425
 AI4425'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 AI4425'NOT RECOVERED.
 AI4425'
 AI4425'NOTE-A NEW PROMENADE WAS LAYED AROUND THE MONUMENT.
 AI4425
 AI4425                          STATION RECOVERY (2014)
 AI4425
 AI4425'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 AI4425'RECOVERED IN GOOD CONDITION.
 AI4425'
 AI4425'NOTE-RECOVERED DUE TO THE PAVERS BEING REMOVED DURING EARTHQUAKE
 AI4425'REPAIR WORK AT THE MONUMENT DURING 2013-2014.  THE MARK IS RUSTY AND
 AI4425'DETERIORATING BUT STILL STRONG AND STABLE.  HOWEVER IT IS CLEARLY BENT
 AI4425'UPWARDS HAVING THE EFFECT OF MAKING ITS HIGHEST POINT EXACTLY 2 INCHES
 AI4425'(5 CM) ABOVE THE POINT WHERE THE PLATE ACTUALLY TOUCHES THE WALL.  DUE
 AI4425'TO THE RUST AND DETERIORATION AND FEAR OF FURTHER DAMAGE, NO ATTEMPT
 AI4425'WAS MADE TO BEND THE MARK BACK INTO PLACE.
 AI4425'
 AI4425'AT THE NORTHEAST CORNER OF WASHINGTON MONUMENT, ON THE EAST FACE OF
 AI4425'THE MONUMENT.  A FLAT IRON BAR (OR PLATE) SET IN THE FOUNDATION OF THE
 AI4425'MONUMENT WALL.
 AI4425'
 AI4425'THE MARK IS BOLTED TO THE WALL FROM BELOW AND ITS UPPER EDGE CLOSEST
 AI4425'TO THE CORNER OF THE MONUMENT IS 7 1/2 INCHES (19 CM) SOUTH OF THE
 AI4425'NORTH EDGE OF EAST SIDE AND 7 INCHES (18 CM) BELOW PAVER LEVEL.  ITS
 AI4425'OVERALL DIMENSIONS ARE 1/4 INCH (6 MM) THICK, 1 1/2 INCHES (4 CM) WIDE
 AI4425'AND IT STICKS OUT OF THE FOUNDATION 4 INCHES (10 CM).
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI4424 ***********************************************************************
 AI4424  DESIGNATION -  W M BASE NW
 AI4424  PID         -  AI4424
 AI4424  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI4424  COUNTRY     -  US
 AI4424  USGS QUAD   -  WASHINGTON WEST (2016)
 AI4424
 AI4424                         *CURRENT SURVEY CONTROL
 AI4424  ______________________________________________________________________
 AI4424* NAD 83(1986) POSITION- 38 53 22.34   (N) 077 02 07.19   (W)   HD_HELD1
 AI4424* NAVD 88 ORTHO HEIGHT -    12.059 (meters)       39.56  (feet) ADJUSTED
 AI4424  ______________________________________________________________________
 AI4424  GEOID HEIGHT    -        -32.088 (meters)                     GEOID18
 AI4424  DYNAMIC HEIGHT  -         12.053 (meters)       39.54  (feet) COMP
 AI4424  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 AI4424
 AI4424  VERT ORDER      -  FIRST     CLASS II
 AI4424
 AI4424.The horizontal coordinates were determined by differentially corrected
 AI4424.hand held GPS observations or other comparable positioning techniques
 AI4424.and have an estimated accuracy of +/- 3 meters.
 AI4424
 AI4424.The orthometric height was determined by differential leveling and
 AI4424.adjusted by the NATIONAL GEODETIC SURVEY
 AI4424.in February 2015.
 AI4424
 AI4424.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI4424.GEOID18 height accuracy estimate available here.
 AI4424
 AI4424.Click photographs - Photos may exist for this station.
 AI4424
 AI4424.The dynamic height is computed by dividing the NAVD 88
 AI4424.geopotential number by the normal gravity value computed on the
 AI4424.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AI4424.degrees latitude (g = 980.6199 gals.).
 AI4424
 AI4424.The modeled gravity was interpolated from observed gravity values.
 AI4424
 AI4424
 AI4424_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2347506487(NAD 83)
 AI4424
 AI4424                          SUPERSEDED SURVEY CONTROL
 AI4424
 AI4424  NAVD 88 (04/25/01)   12.062  (m)           39.57   (f) SUPERSEDED  1 2
 AI4424  NAVD 88 (04/19/00)   12.064  (m)           39.58   (f) SUPERSEDED  1 2
 AI4424
 AI4424.Superseded values are not recommended for survey control.
 AI4424
 AI4424.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AI4424.See file dsdata.pdf to determine how the superseded data were derived.
 AI4424
 AI4424_MARKER: Z = SEE DESCRIPTION
 AI4424_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 AI4424_SP_SET: IRON BAR
 AI4424_MARK LOGO: NONE
 AI4424_MAGNETIC: N = NO MAGNETIC MATERIAL
 AI4424_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AI4424+STABILITY: SURFACE MOTION
 AI4424
 AI4424  HISTORY     - Date     Condition        Report By
 AI4424  HISTORY     - UNK      MONUMENTED       NONE
 AI4424  HISTORY     - 19991110 GOOD             NGS
 AI4424  HISTORY     - 20000510 GOOD             NGS
 AI4424  HISTORY     - 20120301 GOOD             NGS
 AI4424  HISTORY     - 20140408 GOOD             NGS
 AI4424
 AI4424                          STATION DESCRIPTION
 AI4424
 AI4424'DESCRIBED BY NATIONAL GEODETIC SURVEY 1999 (RWA)
 AI4424'IN WASHINGTON DC, AT THE WASHINGTON MONUMENT, AT THE NORTHWEST CORNER
 AI4424'OF THE WASHINGTON MONUMENT, AN IRON BAR SET IN THE FOUNDATION OF THE
 AI4424'MONUMENT WALL, 10 INCHES SOUTH OF NORTH SIDE ON WEST WALL AND 6 INCHES
 AI4424'BELOW SURFACE.
 AI4424
 AI4424                          STATION RECOVERY (2000)
 AI4424
 AI4424'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 AI4424'RECOVERED AS DESCRIBED.
 AI4424
 AI4424                          STATION RECOVERY (2012)
 AI4424
 AI4424'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 AI4424'NOT RECOVERED.
 AI4424'
 AI4424'NOTE-A NEW PROMENADE WAS LAYED AROUND THE MONUMENT.
 AI4424
 AI4424                          STATION RECOVERY (2014)
 AI4424
 AI4424'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 AI4424'RECOVERED IN GOOD CONDITION.
 AI4424'
 AI4424'NOTE-RECOVERED DUE TO THE PAVERS BEING REMOVED DURING EARTHQUAKE
 AI4424'REPAIR WORK AT THE MONUMENT DURING 2013-2014.  THE MARK IS RUSTY
 AI4424'AND DETERIORATINGBUT STILL STRONG AND STABLE.
 AI4424'
 AI4424'AT THE NORTHWEST CORNER OF WASHINGTON MONUMENT, ON THE WEST FACE OF
 AI4424'THE MONUMENT.  A FLAT IRON BAR (OR PLATE) SET IN THE FOUNDATION OF THE
 AI4424'MONUMENT WALL.  IT IS BOLTED TO THE WALL FROM BELOW AND ITS UPPER EDGE
 AI4424'CLOSEST TO THE CORNER OF THE MONUMENT IS 8 1/2 INCHES (22 CM) SOUTH OF
 AI4424'THE NORTH EDGE OF WEST SIDE AND 9 1/2 INCHES (24 CM) BELOW PAVER
 AI4424'LEVEL.  ITS OVERALL DIMENSIONS ARE 1/4 INCH (6 MM) THICK, 1 1/2 INCHES
 AI4424'(4 CM) WIDE AND IT STICKS OUT OF THE FOUNDATION 4 INCHES (10 CM).
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI4423 ***********************************************************************
 AI4423  DESIGNATION -  W M BASE SE
 AI4423  PID         -  AI4423
 AI4423  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI4423  COUNTRY     -  US
 AI4423  USGS QUAD   -  WASHINGTON WEST (2016)
 AI4423
 AI4423                         *CURRENT SURVEY CONTROL
 AI4423  ______________________________________________________________________
 AI4423* NAD 83(1986) POSITION- 38 53 21.77   (N) 077 02 06.52   (W)   HD_HELD1
 AI4423* NAVD 88 ORTHO HEIGHT -    12.068 (meters)       39.59  (feet) ADJUSTED
 AI4423  ______________________________________________________________________
 AI4423  GEOID HEIGHT    -        -32.089 (meters)                     GEOID18
 AI4423  DYNAMIC HEIGHT  -         12.061 (meters)       39.57  (feet) COMP
 AI4423  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 AI4423
 AI4423  VERT ORDER      -  FIRST     CLASS II
 AI4423
 AI4423.The horizontal coordinates were determined by differentially corrected
 AI4423.hand held GPS observations or other comparable positioning techniques
 AI4423.and have an estimated accuracy of +/- 3 meters.
 AI4423
 AI4423.The orthometric height was determined by differential leveling and
 AI4423.adjusted by the NATIONAL GEODETIC SURVEY
 AI4423.in February 2015.
 AI4423
 AI4423.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI4423.GEOID18 height accuracy estimate available here.
 AI4423
 AI4423.Click photographs - Photos may exist for this station.
 AI4423
 AI4423.The dynamic height is computed by dividing the NAVD 88
 AI4423.geopotential number by the normal gravity value computed on the
 AI4423.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AI4423.degrees latitude (g = 980.6199 gals.).
 AI4423
 AI4423.The modeled gravity was interpolated from observed gravity values.
 AI4423
 AI4423
 AI4423_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2349106469(NAD 83)
 AI4423
 AI4423                          SUPERSEDED SURVEY CONTROL
 AI4423
 AI4423  NAVD 88 (04/25/01)   12.064  (m)           39.58   (f) SUPERSEDED  1 2
 AI4423  NAVD 88 (04/19/00)   12.066  (m)           39.59   (f) SUPERSEDED  1 2
 AI4423
 AI4423.Superseded values are not recommended for survey control.
 AI4423
 AI4423.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AI4423.See file dsdata.pdf to determine how the superseded data were derived.
 AI4423
 AI4423_MARKER: Z = SEE DESCRIPTION
 AI4423_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 AI4423_SP_SET: IRON BAR
 AI4423_MARK LOGO: NONE
 AI4423_MAGNETIC: N = NO MAGNETIC MATERIAL
 AI4423_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AI4423+STABILITY: SURFACE MOTION
 AI4423
 AI4423  HISTORY     - Date     Condition        Report By
 AI4423  HISTORY     - UNK      MONUMENTED       NONE
 AI4423  HISTORY     - 19991110 GOOD             NGS
 AI4423  HISTORY     - 20000510 GOOD             NGS
 AI4423  HISTORY     - 20120301 MARK NOT FOUND   NGS
 AI4423  HISTORY     - 20140408 POOR             NGS
 AI4423
 AI4423                          STATION DESCRIPTION
 AI4423
 AI4423'DESCRIBED BY NATIONAL GEODETIC SURVEY 1999 (RWA)
 AI4423'IN WASHINGTON DC, AT THE WASHINGTON MONUMENT, AT THE SOUTHEAST CORNER
 AI4423'OF THE WASHINGTON MONUMENT, AN IRON BAR SET IN THE FOUNDATION OF THE
 AI4423'MONUMENT WALL, 10 INCHES WEST OF EAST EDGE OF SOUTH SIDE, AND 6 INCHES
 AI4423'BELOW CONCRETE SURFACE.
 AI4423
 AI4423                          STATION RECOVERY (2000)
 AI4423
 AI4423'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 AI4423'RECOVERED AS DESCRIBED.
 AI4423
 AI4423                          STATION RECOVERY (2012)
 AI4423
 AI4423'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 AI4423'NOT RECOVERED.
 AI4423'
 AI4423'NOTE-A NEW PROMENADE WAS LAYED AROUND THE MONUMENT.
 AI4423
 AI4423                          STATION RECOVERY (2014)
 AI4423
 AI4423'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 AI4423'RECOVERED IN GOOD CONDITION.
 AI4423'
 AI4423'NOTE-RECOVERED DUE TO THE PAVERS BEING REMOVED DURING EARTHQUAKE
 AI4423'REPAIR WORK AT THE MONUMENT DURING 2013-2014.  THE MARK IS RUSTY AND
 AI4423'DETERIORATING BUT STILL STRONG AND STABLE.  HOWEVER IT IS CLEARLY
 AI4423'ROTATED ABOUT THE BOLT WHICH HOLDS IT TO THE FOUNDATION HAVING THE
 AI4423'EFFECT OF TILTING ITS UPPER SURFACE AND RAISING ITS HIGHEST POINT
 AI4423'FROM WHERE IT ONCE RESIDED.  DUE TO THE RUST AND DETERIORATION AND
 AI4423'FEAR OF FURTHER DAMAGE, NO ATTEMPT WAS MADE TO TWIST THE MARK BACK
 AI4423'INTO PLACE.
 AI4423'
 AI4423'AT THE SOUTHEAST CORNER OF WASHINGTON MONUMENT, ON THE SOUTH FACE OF
 AI4423'THE MONUMENT.  A FLAT IRON BAR (OR PLATE) SET IN THE FOUNDATION OF THE
 AI4423'MONUMENT WALL.
 AI4423'
 AI4423'THE MARK IS BOLTED TO THE WALL FROM BELOW AND ITS UPPER EDGE CLOSEST
 AI4423'TO THE CORNER OF THE MONUMENT IS 8 INCHES (20 CM) WEST OF THE EAST
 AI4423'EDGE OF SOUTH SIDE AND 7 INCHES (18 CM) BELOW PAVER LEVEL.  ITS
 AI4423'OVERALL DIMENSIONS ARE 1/4 INCH (6 MM) THICK, 1 1/2 INCHES (4 CM) WIDE
 AI4423'AND IT STICKS OUT OF THE FOUNDATION 4 INCHES (10 CM).
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ2001 ***********************************************************************
 AJ2001  DESIGNATION -  W M BASE SW
 AJ2001  PID         -  AJ2001
 AJ2001  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ2001  COUNTRY     -  US
 AJ2001  USGS QUAD   -  WASHINGTON WEST (2016)
 AJ2001
 AJ2001                         *CURRENT SURVEY CONTROL
 AJ2001  ______________________________________________________________________
 AJ2001* NAD 83(1986) POSITION- 38 53 21.79   (N) 077 02 07.15   (W)   HD_HELD1
 AJ2001* NAVD 88 ORTHO HEIGHT -    12.108 (meters)       39.72  (feet) ADJUSTED
 AJ2001  ______________________________________________________________________
 AJ2001  GEOID HEIGHT    -        -32.089 (meters)                     GEOID18
 AJ2001  DYNAMIC HEIGHT  -         12.102 (meters)       39.70  (feet) COMP
 AJ2001  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 AJ2001
 AJ2001  VERT ORDER      -  FIRST     CLASS II
 AJ2001
 AJ2001.The horizontal coordinates were determined by differentially corrected
 AJ2001.hand held GPS observations or other comparable positioning techniques
 AJ2001.and have an estimated accuracy of +/- 3 meters.
 AJ2001
 AJ2001.The orthometric height was determined by differential leveling and
 AJ2001.adjusted by the NATIONAL GEODETIC SURVEY
 AJ2001.in February 2015.
 AJ2001
 AJ2001.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ2001.GEOID18 height accuracy estimate available here.
 AJ2001
 AJ2001.Click photographs - Photos may exist for this station.
 AJ2001
 AJ2001.The dynamic height is computed by dividing the NAVD 88
 AJ2001.geopotential number by the normal gravity value computed on the
 AJ2001.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ2001.degrees latitude (g = 980.6199 gals.).
 AJ2001
 AJ2001.The modeled gravity was interpolated from observed gravity values.
 AJ2001
 AJ2001
 AJ2001_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2347606470(NAD 83)
 AJ2001
 AJ2001                          SUPERSEDED SURVEY CONTROL
 AJ2001
 AJ2001  NAVD 88 (04/25/01)   12.064  (m)           39.58   (f) SUPERSEDED  1 2
 AJ2001
 AJ2001.Superseded values are not recommended for survey control.
 AJ2001
 AJ2001.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AJ2001.See file dsdata.pdf to determine how the superseded data were derived.
 AJ2001
 AJ2001_MARKER: Z = SEE DESCRIPTION
 AJ2001_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 AJ2001_SP_SET: IRON BAR
 AJ2001_MARK LOGO: NONE
 AJ2001_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ2001_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 AJ2001+STABILITY: SURFACE MOTION
 AJ2001
 AJ2001  HISTORY     - Date     Condition        Report By
 AJ2001  HISTORY     - UNK      MONUMENTED       NONE
 AJ2001  HISTORY     - 20000510 GOOD             NGS
 AJ2001  HISTORY     - 20010301 MARK NOT FOUND   NGS
 AJ2001  HISTORY     - 20140408 SEE DESCRIPTION  NGS
 AJ2001
 AJ2001                          STATION DESCRIPTION
 AJ2001
 AJ2001'DESCRIBED BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 AJ2001'IN WASHINGTON, D.C., AT THE WASHINGTON MONUMENT, AT THE SOUTHWEST
 AJ2001'CORNER OF WASHINGTON MONUMENT, AN IRON SET SET IN THE FOUNDATION OF
 AJ2001'THE MONUMENT WALL, 7 INCHES WEST OF WEST EDGE OF SOUTH SIDE, AND 6
 AJ2001'INCHES BELOW GROUND LEVEL.
 AJ2001
 AJ2001                          STATION RECOVERY (2001)
 AJ2001
 AJ2001'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2001 (DRD)
 AJ2001'NOT RECOVERED.
 AJ2001'
 AJ2001'NOTE-A NEW PROMENADE WAS LAYED AROUND THE MONUMENT.
 AJ2001
 AJ2001                          STATION RECOVERY (2014)
 AJ2001
 AJ2001'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 AJ2001'RECOVERED IN GOOD CONDITION.
 AJ2001'
 AJ2001'NOTE-RECOVERED DUE TO THE PAVERS BEING REMOVED DURING EARTHQUAKE
 AJ2001'REPAIR WORK AT THE MONUMENT DURING 2013-2014.  THE MARK IS RUSTY AND
 AJ2001'DETERIORATING BUT STILL STRONG AND STABLE.
 AJ2001'
 AJ2001'AT THE SOUTHWEST CORNER OF WASHINGTON MONUMENT, ON THE SOUTH FACE OF
 AJ2001'THE MONUMENT.  A FLAT IRON BAR (OR PLATE) SET IN THE FOUNDATION OF THE
 AJ2001'MONUMENT WALL.  IT IS BOLTED TO THE WALL FROM BELOW AND ITS UPPER EDGE
 AJ2001'CLOSEST TO THE CORNER OF THE MONUMENT IS 11 INCHES (28 CM) EAST OF
 AJ2001'WEST EDGE OF SOUTH SIDE AND 10 INCHES (25 CM) BELOW PAVER LEVEL.  ITS
 AJ2001'OVERALL DIMENSIONS ARE 1/4 INCH (6 MM) THICK, 1 1/2 INCHES (4 CM) WIDE
 AJ2001'AND IT STICKS OUT OF THE FOUNDATION 4 INCHES (10 CM).
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ1997 ***********************************************************************
 AJ1997  DESIGNATION -  W M CASEY EAST
 AJ1997  PID         -  AJ1997
 AJ1997  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ1997  COUNTRY     -  US
 AJ1997  USGS QUAD   -  WASHINGTON WEST (2016)
 AJ1997
 AJ1997                         *CURRENT SURVEY CONTROL
 AJ1997  ______________________________________________________________________
 AJ1997* NAD 83(1986) POSITION- 38 53 22.03   (N) 077 02 06.54   (W)   HD_HELD1
 AJ1997* NAVD 88 ORTHO HEIGHT -    11.988 (meters)       39.33  (feet) ADJUSTED
 AJ1997  ______________________________________________________________________
 AJ1997  GEOID HEIGHT    -        -32.089 (meters)                     GEOID18
 AJ1997  DYNAMIC HEIGHT  -         11.982 (meters)       39.31  (feet) COMP
 AJ1997  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 AJ1997
 AJ1997  VERT ORDER      -  FIRST     CLASS II
 AJ1997
 AJ1997.The horizontal coordinates were determined by differentially corrected
 AJ1997.hand held GPS observations or other comparable positioning techniques
 AJ1997.and have an estimated accuracy of +/- 3 meters.
 AJ1997
 AJ1997.The orthometric height was determined by differential leveling and
 AJ1997.adjusted by the NATIONAL GEODETIC SURVEY
 AJ1997.in April 2001.
 AJ1997
 AJ1997.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ1997.GEOID18 height accuracy estimate available here.
 AJ1997
 AJ1997.Click photographs - Photos may exist for this station.
 AJ1997
 AJ1997.The dynamic height is computed by dividing the NAVD 88
 AJ1997.geopotential number by the normal gravity value computed on the
 AJ1997.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ1997.degrees latitude (g = 980.6199 gals.).
 AJ1997
 AJ1997.The modeled gravity was interpolated from observed gravity values.
 AJ1997
 AJ1997
 AJ1997_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2349006477(NAD 83)
 AJ1997
 AJ1997                          SUPERSEDED SURVEY CONTROL
 AJ1997
 AJ1997.No superseded survey control is available for this station.
 AJ1997
 AJ1997_MARKER: DV = VERTICAL CONTROL DISK
 AJ1997_SETTING: 40 = SET IN A LARGE STRUCTURE WITH DEEP FOUNDATIONS
 AJ1997_SP_SET: FOUNDATION
 AJ1997_STAMPING: W M CASEY EAST 2000
 AJ1997_MARK LOGO: NGS
 AJ1997_MAGNETIC: O = OTHER; SEE DESCRIPTION
 AJ1997_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 AJ1997+STABILITY: POSITION/ELEVATION WELL
 AJ1997_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AJ1997+SATELLITE: SATELLITE OBSERVATIONS - March 01, 2012
 AJ1997
 AJ1997  HISTORY     - Date     Condition        Report By
 AJ1997  HISTORY     - UNK      MONUMENTED       NONE
 AJ1997  HISTORY     - 20000811 GOOD             NGS
 AJ1997  HISTORY     - 20060216 GOOD             USPSQD
 AJ1997  HISTORY     - 20090320 GOOD             GEOCAC
 AJ1997  HISTORY     - 20120301 GOOD             NGS
 AJ1997
 AJ1997                          STATION DESCRIPTION
 AJ1997
 AJ1997'DESCRIBED BY NATIONAL GEODETIC SURVEY 2000 (DBC)
 AJ1997'IN WASHINGTON D.C..  AT THE WASHINGTON MONUMENT THE MARK IS 3.3 FEET
 AJ1997'(1.0 M) NORTH-NORTHEAST OF SOUTH EDGE OF ENTRANCE TO WASHINGTON
 AJ1997'MONUMENT, 3.0 FEET (0.9 M) SOUTH-SOUTHEAST OF NORTH EDGE OF ENTRANCE
 AJ1997'TO WASHINGTON MONUMENT, 1.0 FOOT (0.3 M) EAST OF STEP TO ENTRANCE,
 AJ1997'27.95 FEET (8.52 M) SOUTH OF NORTHEAST CORNER OF NORTH FACE OF
 AJ1997'WASHINGTON MONUMENT, AND 27.9 FEET (8.5 M) NORTH OF SOUTHEAST CORNER
 AJ1997'OF SOUTH FACE OF WASHINGTON MONUMENT.  A NGS LOGO CAP WAS PUT OVER
 AJ1997'BENCH MARK TO PROTECT IT.  NOTE--NOTIFY MR STEVE LORENZITTI WITH THE
 AJ1997'NATIONAL PARK SERVICE AT 202-485-9680 BEFORE ENTERING THE PREMISES OF
 AJ1997'THE WASHINGTON MONUMENT.
 AJ1997
 AJ1997                          STATION RECOVERY (2006)
 AJ1997
 AJ1997'RECOVERY NOTE BY US POWER SQUADRON 2006 (JCH)
 AJ1997'RECOVERED IN GOOD CONDITION.
 AJ1997
 AJ1997                          STATION RECOVERY (2009)
 AJ1997
 AJ1997'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 AJ1997'RECOVERED IN GOOD CONDITION.
 AJ1997
 AJ1997                          STATION RECOVERY (2012)
 AJ1997
 AJ1997'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 AJ1997'RECOVERED AS DESCRIBED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ1996 ***********************************************************************
 AJ1996  DESIGNATION -  W M CASEY NE
 AJ1996  PID         -  AJ1996
 AJ1996  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ1996  COUNTRY     -  US
 AJ1996  USGS QUAD   -  WASHINGTON WEST (2016)
 AJ1996
 AJ1996                         *CURRENT SURVEY CONTROL
 AJ1996  ______________________________________________________________________
 AJ1996* NAD 83(1986) POSITION- 38 53 22.30   (N) 077 02 06.57   (W)   HD_HELD1
 AJ1996* NAVD 88 ORTHO HEIGHT -    11.997 (meters)       39.36  (feet) ADJUSTED
 AJ1996  ______________________________________________________________________
 AJ1996  GEOID HEIGHT    -        -32.088 (meters)                     GEOID18
 AJ1996  DYNAMIC HEIGHT  -         11.991 (meters)       39.34  (feet) COMP
 AJ1996  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 AJ1996
 AJ1996  VERT ORDER      -  FIRST     CLASS II
 AJ1996
 AJ1996.The horizontal coordinates were determined by differentially corrected
 AJ1996.hand held GPS observations or other comparable positioning techniques
 AJ1996.and have an estimated accuracy of +/- 3 meters.
 AJ1996
 AJ1996.The orthometric height was determined by differential leveling and
 AJ1996.adjusted by the NATIONAL GEODETIC SURVEY
 AJ1996.in October 2012.
 AJ1996
 AJ1996.No vertical observational check was made to the station.
 AJ1996
 AJ1996.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ1996.GEOID18 height accuracy estimate available here.
 AJ1996
 AJ1996.Click photographs - Photos may exist for this station.
 AJ1996
 AJ1996.The dynamic height is computed by dividing the NAVD 88
 AJ1996.geopotential number by the normal gravity value computed on the
 AJ1996.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ1996.degrees latitude (g = 980.6199 gals.).
 AJ1996
 AJ1996.The modeled gravity was interpolated from observed gravity values.
 AJ1996
 AJ1996
 AJ1996_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2349006486(NAD 83)
 AJ1996
 AJ1996                          SUPERSEDED SURVEY CONTROL
 AJ1996
 AJ1996  NAVD 88 (04/20/10)   11.998  (m)           39.36   (f) SUPERSEDED  1 2
 AJ1996  NAVD 88 (04/25/01)   11.997  (m)           39.36   (f) SUPERSEDED  1 2
 AJ1996
 AJ1996.Superseded values are not recommended for survey control.
 AJ1996
 AJ1996.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AJ1996.See file dsdata.pdf to determine how the superseded data were derived.
 AJ1996
 AJ1996_MARKER: DV = VERTICAL CONTROL DISK
 AJ1996_SETTING: 40 = SET IN A LARGE STRUCTURE WITH DEEP FOUNDATIONS
 AJ1996_SP_SET: FOUNDATION
 AJ1996_STAMPING: W M CASEY NE
 AJ1996_MARK LOGO: NGS
 AJ1996_MAGNETIC: O = OTHER; SEE DESCRIPTION
 AJ1996_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 AJ1996+STABILITY: POSITION/ELEVATION WELL
 AJ1996_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AJ1996+SATELLITE: SATELLITE OBSERVATIONS - April 08, 2014
 AJ1996
 AJ1996  HISTORY     - Date     Condition        Report By
 AJ1996  HISTORY     - UNK      MONUMENTED       NONE
 AJ1996  HISTORY     - 20000811 GOOD             NGS
 AJ1996  HISTORY     - 20060216 GOOD             USPSQD
 AJ1996  HISTORY     - 200812   GOOD             NGS
 AJ1996  HISTORY     - 20090320 GOOD             GEOCAC
 AJ1996  HISTORY     - 20120301 GOOD             NGS
 AJ1996  HISTORY     - 20140408 GOOD             NGS
 AJ1996  HISTORY     - 20150301 GOOD             NGS
 AJ1996  HISTORY     - 20211211 GOOD             USPSQD
 AJ1996
 AJ1996                          STATION DESCRIPTION
 AJ1996
 AJ1996'DESCRIBED BY NATIONAL GEODETIC SURVEY 2000 (DBC)
 AJ1996'IN WASHINGTON D.C.  AT THE WASHINGTON MONUMENT.  THE MARK IS 1.6 FEET
 AJ1996'(0.5 M) NORTHEAST OF NORTHEAST CORNER OF WASHINGTON MONUMENT 28.7 FEET
 AJ1996'(8.7 M) NORTH OF WM CASEY EAST, 4.1 FEET (1.2 M) EAST-NORTHEAST OF
 AJ1996'BENCH MARK A 8.  A PROMENADE WAS LAYED AROUND THE MONUMENT AND NGS
 AJ1996'LOGO CAP WITH A 1 FOOT (0.3 M) LONG PVC PIPE TO PROTECT BENCH MARK.
 AJ1996'THE LOGO CAP IS FLUSH WITH THE PROMENADE AND BENCH MARK IS 18 INCHES
 AJ1996'BELOW CAP.  NOTE--NOTIFY MR STEVE LORENZITTI WITH THE NATIONAL PARK
 AJ1996'SERVICE AT 202-485-9680 BEFORE ENTERING THE PREMISES OF THE WASHINGTON
 AJ1996'MONUMENT.
 AJ1996
 AJ1996                          STATION RECOVERY (2006)
 AJ1996
 AJ1996'RECOVERY NOTE BY US POWER SQUADRON 2006 (JCH)
 AJ1996'RECOVERED IN GOOD CONDITION.
 AJ1996
 AJ1996                          STATION RECOVERY (2008)
 AJ1996
 AJ1996'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 AJ1996'RECOVERED AS DESCRIBED.
 AJ1996
 AJ1996                          STATION RECOVERY (2009)
 AJ1996
 AJ1996'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 AJ1996'RECOVERED IN GOOD CONDITION.
 AJ1996
 AJ1996                          STATION RECOVERY (2012)
 AJ1996
 AJ1996'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 AJ1996'RECOVERED AS DESCRIBED.
 AJ1996
 AJ1996                          STATION RECOVERY (2014)
 AJ1996
 AJ1996'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 AJ1996'RECOVERED IN GOOD CONDITION.
 AJ1996'
 AJ1996'NOTE-THE MARK IS 2 1/2 INCHES (6 CM) IN DIAMETER AND ITS CENTER IS 19
 AJ1996'1/2 INCHES (50 CM) NORTHEAST OF THE NORTHEAST CORNER OF THE MONUMENT.
 AJ1996'NEW LARGER PVC PIPE WAS INSTALLED TO REPLACE OLDER PIPE THAT WAS TOO
 AJ1996'SMALL FOR A LEVEL ROD TO FIT INSIDE.  THE LOGO CAP WAS NEWLY STAMPED
 AJ1996'IN 2014 AND REPLACED FLUSH WITH THE PAVERS.  THE MARK ITSELF WAS ALSO
 AJ1996'STAMPED IN 2014.
 AJ1996'
 AJ1996'THE FOLLOWING IS ONLY NOTICEABLE WHEN THE PAVERS AND PVC ARE REMOVED
 AJ1996'AND THE LEVEL OF THE MARK IS ACCESSIBLE.  THE MARK IS ABUTTED BY 2
 AJ1996'METAL PLATES SET VERTICALLY ON EDGE WHOSE EDGES ARE ABOUT THE SAME
 AJ1996'LEVEL AS THE MARK.  THESE VISIBLE PLATE EDGES ARE 3/4 INCHES (2 CM)
 AJ1996'WIDE AND 7 INCHES (18 CM) LONG.  THE MARK ALSO HAS A HOLE 3 INCHES
 AJ1996'(8 CM) DIAMETER SITTING 8 1/2 INCHES (22 CM) CLOSER TO THE NORTHEAST
 AJ1996'CORNER THAN THE MARK ITSELF.  THIS HOLE IS 4 INCHES (10 CM) DEEP.
 AJ1996
 AJ1996                          STATION RECOVERY (2015)
 AJ1996
 AJ1996'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2015
 AJ1996'RECOVERED IN GOOD CONDITION.
 AJ1996
 AJ1996                          STATION RECOVERY (2021)
 AJ1996
 AJ1996'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 AJ1996'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ2000 ***********************************************************************
 AJ2000  DESIGNATION -  W M CASEY NW
 AJ2000  PID         -  AJ2000
 AJ2000  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ2000  COUNTRY     -  US
 AJ2000  USGS QUAD   -  WASHINGTON WEST (2016)
 AJ2000
 AJ2000                         *CURRENT SURVEY CONTROL
 AJ2000  ______________________________________________________________________
 AJ2000* NAD 83(1986) POSITION- 38 53 22.34   (N) 077 02 07.19   (W)   HD_HELD1
 AJ2000* NAVD 88 ORTHO HEIGHT -    11.993 (meters)       39.35  (feet) ADJUSTED
 AJ2000  ______________________________________________________________________
 AJ2000  GEOID HEIGHT    -        -32.088 (meters)                     GEOID18
 AJ2000  DYNAMIC HEIGHT  -         11.986 (meters)       39.32  (feet) COMP
 AJ2000  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 AJ2000
 AJ2000  VERT ORDER      -  FIRST     CLASS II
 AJ2000
 AJ2000.The horizontal coordinates were determined by differentially corrected
 AJ2000.hand held GPS observations or other comparable positioning techniques
 AJ2000.and have an estimated accuracy of +/- 3 meters.
 AJ2000
 AJ2000.The orthometric height was determined by differential leveling and
 AJ2000.adjusted by the NATIONAL GEODETIC SURVEY
 AJ2000.in October 2012.
 AJ2000
 AJ2000.No vertical observational check was made to the station.
 AJ2000
 AJ2000.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ2000.GEOID18 height accuracy estimate available here.
 AJ2000
 AJ2000.Click photographs - Photos may exist for this station.
 AJ2000
 AJ2000.The dynamic height is computed by dividing the NAVD 88
 AJ2000.geopotential number by the normal gravity value computed on the
 AJ2000.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ2000.degrees latitude (g = 980.6199 gals.).
 AJ2000
 AJ2000.The modeled gravity was interpolated from observed gravity values.
 AJ2000
 AJ2000
 AJ2000_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2347506487(NAD 83)
 AJ2000
 AJ2000                          SUPERSEDED SURVEY CONTROL
 AJ2000
 AJ2000  NAVD 88 (04/20/10)   11.994  (m)           39.35   (f) SUPERSEDED  1 2
 AJ2000  NAVD 88 (04/25/01)   11.992  (m)           39.34   (f) SUPERSEDED  1 2
 AJ2000
 AJ2000.Superseded values are not recommended for survey control.
 AJ2000
 AJ2000.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AJ2000.See file dsdata.pdf to determine how the superseded data were derived.
 AJ2000
 AJ2000_MARKER: DV = VERTICAL CONTROL DISK
 AJ2000_SETTING: 40 = SET IN A LARGE STRUCTURE WITH DEEP FOUNDATIONS
 AJ2000_SP_SET: FOUNDATION
 AJ2000_STAMPING: W M CASEY NW
 AJ2000_MARK LOGO: NGS
 AJ2000_MAGNETIC: O = OTHER; SEE DESCRIPTION
 AJ2000_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 AJ2000+STABILITY: POSITION/ELEVATION WELL
 AJ2000_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AJ2000+SATELLITE: SATELLITE OBSERVATIONS - December 11, 2021
 AJ2000
 AJ2000  HISTORY     - Date     Condition        Report By
 AJ2000  HISTORY     - UNK      MONUMENTED       NONE
 AJ2000  HISTORY     - 20000811 GOOD             NGS
 AJ2000  HISTORY     - 20060216 GOOD             USPSQD
 AJ2000  HISTORY     - 200812   GOOD             NGS
 AJ2000  HISTORY     - 20090320 GOOD             GEOCAC
 AJ2000  HISTORY     - 20120301 GOOD             NGS
 AJ2000  HISTORY     - 20140408 GOOD             NGS
 AJ2000  HISTORY     - 20211211 GOOD             USPSQD
 AJ2000
 AJ2000                          STATION DESCRIPTION
 AJ2000
 AJ2000'DESCRIBED BY NATIONAL GEODETIC SURVEY 2000 (DBC)
 AJ2000'IN WASHINGTON D.C.  AT THE WASHINGTON MONUMENT, THE MARK IS 1.5 FOOT
 AJ2000'(0.5 M) NORTHWEST OF NORTHWEST CORNER OF WASHINGTON MONUMENT.  A
 AJ2000'PROMENADE WAS LAYED AROUND THE MONUMENT AND NGS LOGO CAP WITH A 1 FOOT
 AJ2000'(0.3 M) LONG PVC PIPE TO PROTECT BENCH MARK.  THE LOGO CAP IS FLUSH
 AJ2000'WITH THE PROMENADE AND BENCH MARK IS 18 INCHES BELOW CAP. NOTE--NOTIFY
 AJ2000'MR STEVE LORENZITTI WITH THE NATIONAL PARK SERVICE AT 202-485-9680
 AJ2000'BEFORE ENTERING THE PREMISES OF THE WASHINGTON MONUMENT.
 AJ2000
 AJ2000                          STATION RECOVERY (2006)
 AJ2000
 AJ2000'RECOVERY NOTE BY US POWER SQUADRON 2006 (JCH)
 AJ2000'RECOVERED IN GOOD CONDITION.
 AJ2000
 AJ2000                          STATION RECOVERY (2008)
 AJ2000
 AJ2000'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 AJ2000'RECOVERED AS DESCRIBED.
 AJ2000
 AJ2000                          STATION RECOVERY (2009)
 AJ2000
 AJ2000'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 AJ2000'RECOVERED IN GOOD CONDITION.
 AJ2000
 AJ2000                          STATION RECOVERY (2012)
 AJ2000
 AJ2000'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 AJ2000'RECOVERED AS DESCRIBED.
 AJ2000
 AJ2000                          STATION RECOVERY (2014)
 AJ2000
 AJ2000'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 AJ2000'RECOVERED IN GOOD CONDITION.
 AJ2000'
 AJ2000'NOTE-THE MARK IS 2 1/2 INCHES (6 CM) IN DIAMETER AND ITS CENTER IS 17
 AJ2000'1/4 INCHES (44 CM) NORTHWEST OF THE NORTHWEST CORNER OF THE MONUMENT.
 AJ2000'NEW LARGER PVC PIPE WAS INSTALLED TO REPLACE OLDER PIPE THAT WAS TOO
 AJ2000'SMALL FOR A LEVEL ROD TO FIT INSIDE.  THE LOGO CAP WAS NEWLY STAMPED
 AJ2000'IN 2014 AND REPLACED FLUSH WITH THE PAVERS.  THE MARK ITSELF WAS ALSO
 AJ2000'STAMPED IN 2014.
 AJ2000'
 AJ2000'THE FOLLOWING IS ONLY NOTICEABLE WHEN THE PAVERS AND PVC ARE REMOVED
 AJ2000'AND THE LEVEL OF THE MARK IS ACCESSIBLE.  THE MARK IS NEIGHBORED BY A
 AJ2000'LARGE METAL EYEBOLT SITTING ABOUT 5 INCHES (13 CM) NORTHWEST OF THE
 AJ2000'MARK CENTER.  THERE IS ALSO AN IRON ROD SET VERTICALLY WHOSE TOP
 AJ2000'SURFACE IS VERY CLOSE TO THE SURFACE OF THE MARK.  THIS IRON ROD IS
 AJ2000'ABOUT 4 1/4 INCHES (11 CM) SOUTH OF THE CENTER OF THE MARK.  FINALLY
 AJ2000'THE MARK, EYEBOLT AND IRON ROD ALL SEEM TO BE SITTING ON A LARGE STONE
 AJ2000'PAD SOMEWHAT DISTINCTLY DIFFERENT THAN THE SURROUNDING AREA.
 AJ2000
 AJ2000                          STATION RECOVERY (2021)
 AJ2000
 AJ2000'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 AJ2000'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ1999 ***********************************************************************
 AJ1999  DESIGNATION -  W M CASEY SE
 AJ1999  PID         -  AJ1999
 AJ1999  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ1999  COUNTRY     -  US
 AJ1999  USGS QUAD   -  WASHINGTON WEST (2016)
 AJ1999
 AJ1999                         *CURRENT SURVEY CONTROL
 AJ1999  ______________________________________________________________________
 AJ1999* NAD 83(1986) POSITION- 38 53 21.76   (N) 077 02 06.52   (W)   HD_HELD1
 AJ1999* NAVD 88 ORTHO HEIGHT -    11.994 (meters)       39.35  (feet) ADJUSTED
 AJ1999  ______________________________________________________________________
 AJ1999  GEOID HEIGHT    -        -32.089 (meters)                     GEOID18
 AJ1999  DYNAMIC HEIGHT  -         11.988 (meters)       39.33  (feet) COMP
 AJ1999  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 AJ1999
 AJ1999  VERT ORDER      -  FIRST     CLASS II
 AJ1999
 AJ1999.The horizontal coordinates were determined by differentially corrected
 AJ1999.hand held GPS observations or other comparable positioning techniques
 AJ1999.and have an estimated accuracy of +/- 3 meters.
 AJ1999
 AJ1999.The orthometric height was determined by differential leveling and
 AJ1999.adjusted by the NATIONAL GEODETIC SURVEY
 AJ1999.in April 2010.
 AJ1999
 AJ1999.No vertical observational check was made to the station.
 AJ1999
 AJ1999.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ1999.GEOID18 height accuracy estimate available here.
 AJ1999
 AJ1999.Click photographs - Photos may exist for this station.
 AJ1999
 AJ1999.The dynamic height is computed by dividing the NAVD 88
 AJ1999.geopotential number by the normal gravity value computed on the
 AJ1999.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ1999.degrees latitude (g = 980.6199 gals.).
 AJ1999
 AJ1999.The modeled gravity was interpolated from observed gravity values.
 AJ1999
 AJ1999
 AJ1999_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2349106469(NAD 83)
 AJ1999
 AJ1999                          SUPERSEDED SURVEY CONTROL
 AJ1999
 AJ1999  NAVD 88 (04/25/01)   11.992  (m)           39.34   (f) SUPERSEDED  1 2
 AJ1999
 AJ1999.Superseded values are not recommended for survey control.
 AJ1999
 AJ1999.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AJ1999.See file dsdata.pdf to determine how the superseded data were derived.
 AJ1999
 AJ1999_MARKER: DV = VERTICAL CONTROL DISK
 AJ1999_SETTING: 40 = SET IN A LARGE STRUCTURE WITH DEEP FOUNDATIONS
 AJ1999_SP_SET: FOUNDATION
 AJ1999_STAMPING: W M CASEY SE
 AJ1999_MARK LOGO: NGS
 AJ1999_MAGNETIC: O = OTHER; SEE DESCRIPTION
 AJ1999_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 AJ1999+STABILITY: POSITION/ELEVATION WELL
 AJ1999_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AJ1999+SATELLITE: SATELLITE OBSERVATIONS - December 11, 2021
 AJ1999
 AJ1999  HISTORY     - Date     Condition        Report By
 AJ1999  HISTORY     - UNK      MONUMENTED       NONE
 AJ1999  HISTORY     - 20000811 GOOD             NGS
 AJ1999  HISTORY     - 20060216 GOOD             USPSQD
 AJ1999  HISTORY     - 20081224 GOOD             NGS
 AJ1999  HISTORY     - 20090320 GOOD             GEOCAC
 AJ1999  HISTORY     - 20120301 GOOD             NGS
 AJ1999  HISTORY     - 20140408 GOOD             NGS
 AJ1999  HISTORY     - 20211211 GOOD             USPSQD
 AJ1999
 AJ1999                          STATION DESCRIPTION
 AJ1999
 AJ1999'DESCRIBED BY NATIONAL GEODETIC SURVEY 2000 (DBC)
 AJ1999'IN WASHINGTON D.C.  AT THE WASHINGTON MONUMENT, THE MARK IS 1.3 FOOT
 AJ1999'(0.4 M) SOUTHEAST OF SOUTHEAST CORNER OF WASHINGTON MONUMENT, 28.5
 AJ1999'FEET (8.7 M) SOUTH OF WM CASEY EAST, 25.6 FEET (7.8 M) SOUTH OF SOUTH
 AJ1999'EDGE OF EAST ENTRANCE.  A PROMENADE WAS LAYED AROUND THE MONUMENT AND
 AJ1999'NGS LOGO CAP WITH A 1 FOOT (0.3 M) LONG PVC PIPE TO PROTECT BENCH
 AJ1999'MARK.  THE LOGO CAP IS FLUSH WITH THE PROMENADE AND BENCH MARK IS 18
 AJ1999'INCHES BELOW CAP.  NOTE--NOTIFY MR STEVE LORENZITTI WITH THE NATIONAL
 AJ1999'PARK SERVICE AT 202-485-9680 BEFORE ENTERING THE PREMISES OF THE
 AJ1999'WASHINGTON MONUMENT.
 AJ1999
 AJ1999                          STATION RECOVERY (2006)
 AJ1999
 AJ1999'RECOVERY NOTE BY US POWER SQUADRON 2006 (JCH)
 AJ1999'RECOVERED IN GOOD CONDITION.
 AJ1999
 AJ1999                          STATION RECOVERY (2008)
 AJ1999
 AJ1999'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 AJ1999'RECOVERED AS DESCRIBED.
 AJ1999
 AJ1999                          STATION RECOVERY (2009)
 AJ1999
 AJ1999'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 AJ1999'RECOVERED IN GOOD CONDITION.
 AJ1999
 AJ1999                          STATION RECOVERY (2012)
 AJ1999
 AJ1999'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 AJ1999'RECOVERED AS DESCRIBED.
 AJ1999
 AJ1999                          STATION RECOVERY (2014)
 AJ1999
 AJ1999'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 AJ1999'RECOVERED IN GOOD CONDITION.
 AJ1999'
 AJ1999'NOTE-THE MARK IS 2 1/2 INCHES (6 CM) IN DIAMETER AND ITS CENTER IS 15
 AJ1999'1/2 INCHES (39 CM) SOUTHEAST OF THE SOUTHEAST CORNER OF THE MONUMENT.
 AJ1999'NEW LARGER PVC PIPE WAS INSTALLED TO REPLACE OLDER PIPE THAT WAS TOO
 AJ1999'SMALL FOR A LEVEL ROD TO FIT INSIDE.  THE LOGO CAP WAS NEWLY STAMPED
 AJ1999'IN 2014 AND REPLACED FLUSH WITH THE PAVERS.  THE MARK ITSELF WAS ALSO
 AJ1999'STAMPED IN 2014.
 AJ1999'
 AJ1999'THE FOLLOWING IS ONLY NOTICEABLE WHEN THE PAVERS AND PVC ARE REMOVED
 AJ1999'AND THE LEVEL OF THE MARK IS ACCESSIBLE.  THE MARK IS NEIGHBORED BY A
 AJ1999'HOLE 3 INCHES (8 CM) IN DIAMETER ABOUT 6 1/2 INCHES (17 CM) CLOSER TO
 AJ1999'THE CORNER OF THE MONUMENT THAN THE MARK ITSELF.
 AJ1999
 AJ1999                          STATION RECOVERY (2021)
 AJ1999
 AJ1999'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 AJ1999'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ1998 ***********************************************************************
 AJ1998  DESIGNATION -  W M CASEY SW
 AJ1998  PID         -  AJ1998
 AJ1998  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ1998  COUNTRY     -  US
 AJ1998  USGS QUAD   -  WASHINGTON WEST (2016)
 AJ1998
 AJ1998                         *CURRENT SURVEY CONTROL
 AJ1998  ______________________________________________________________________
 AJ1998* NAD 83(1986) POSITION- 38 53 21.78   (N) 077 02 07.15   (W)   HD_HELD1
 AJ1998* NAVD 88 ORTHO HEIGHT -    11.999 (meters)       39.37  (feet) ADJUSTED
 AJ1998  ______________________________________________________________________
 AJ1998  GEOID HEIGHT    -        -32.089 (meters)                     GEOID18
 AJ1998  DYNAMIC HEIGHT  -         11.993 (meters)       39.35  (feet) COMP
 AJ1998  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 AJ1998
 AJ1998  VERT ORDER      -  FIRST     CLASS II
 AJ1998
 AJ1998.The horizontal coordinates were determined by differentially corrected
 AJ1998.hand held GPS observations or other comparable positioning techniques
 AJ1998.and have an estimated accuracy of +/- 3 meters.
 AJ1998
 AJ1998.The orthometric height was determined by differential leveling and
 AJ1998.adjusted by the NATIONAL GEODETIC SURVEY
 AJ1998.in October 2012.
 AJ1998
 AJ1998.No vertical observational check was made to the station.
 AJ1998
 AJ1998.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ1998.GEOID18 height accuracy estimate available here.
 AJ1998
 AJ1998.Click photographs - Photos may exist for this station.
 AJ1998
 AJ1998.The dynamic height is computed by dividing the NAVD 88
 AJ1998.geopotential number by the normal gravity value computed on the
 AJ1998.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ1998.degrees latitude (g = 980.6199 gals.).
 AJ1998
 AJ1998.The modeled gravity was interpolated from observed gravity values.
 AJ1998
 AJ1998
 AJ1998_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2347606470(NAD 83)
 AJ1998
 AJ1998                          SUPERSEDED SURVEY CONTROL
 AJ1998
 AJ1998  NAVD 88 (04/20/10)   12.000  (m)           39.37   (f) SUPERSEDED  1 2
 AJ1998  NAVD 88 (04/25/01)   11.999  (m)           39.37   (f) SUPERSEDED  1 2
 AJ1998
 AJ1998.Superseded values are not recommended for survey control.
 AJ1998
 AJ1998.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AJ1998.See file dsdata.pdf to determine how the superseded data were derived.
 AJ1998
 AJ1998_MARKER: DV = VERTICAL CONTROL DISK
 AJ1998_SETTING: 40 = SET IN A LARGE STRUCTURE WITH DEEP FOUNDATIONS
 AJ1998_SP_SET: FOUNDATION
 AJ1998_STAMPING: W M CASEY SW
 AJ1998_MARK LOGO: NGS
 AJ1998_MAGNETIC: O = OTHER; SEE DESCRIPTION
 AJ1998_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 AJ1998+STABILITY: POSITION/ELEVATION WELL
 AJ1998_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AJ1998+SATELLITE: SATELLITE OBSERVATIONS - December 11, 2021
 AJ1998
 AJ1998  HISTORY     - Date     Condition        Report By
 AJ1998  HISTORY     - UNK      MONUMENTED       NONE
 AJ1998  HISTORY     - 20000811 GOOD             NGS
 AJ1998  HISTORY     - 20060216 GOOD             USPSQD
 AJ1998  HISTORY     - 20081223 GOOD             NGS
 AJ1998  HISTORY     - 20090320 GOOD             GEOCAC
 AJ1998  HISTORY     - 20120301 GOOD             NGS
 AJ1998  HISTORY     - 20140408 GOOD             NGS
 AJ1998  HISTORY     - 20211211 GOOD             USPSQD
 AJ1998
 AJ1998                          STATION DESCRIPTION
 AJ1998
 AJ1998'DESCRIBED BY NATIONAL GEODETIC SURVEY 2000 (DBC)
 AJ1998'IN WASHINGTON D.C.  AT THE WASHINGTON MONUMENT.  A SOLID BRASS PIN SET
 AJ1998'IN LEAD IN THE FOUNDATION OF THE WASHINGTON MONUMENT, 1.3 FOOT (0.4 M)
 AJ1998'SOUTHWEST OF SOUTHWEST CORNER OF THE MONUMENT, 4.2 FEET (1.3 M)
 AJ1998'WEST-SOUTHWEST OF SOUTHWEST CORNER OF MONUMENT.  A PROMENADE WAS LAYED
 AJ1998'AROUND THE MONUMENT AND NGS LOGO CAP WITH A 1 FOOT (0.3 M) LONG PVC
 AJ1998'PIPE TO PROTECT BENCH MARK.  THE LOGO CAP IS FLUSH WITH THE PROMENADE
 AJ1998'AND BENCH MARK IS 18 INCHES BELOW CAP.  NOTE--NOTIFY MR STEVE
 AJ1998'LORENZITTI WITH THE NATIONAL PARK SERVICE AT 202-485-9680 BEFORE
 AJ1998'ENTERING THE PREMISES OF THE WASHINGTON MONUMENT.
 AJ1998
 AJ1998                          STATION RECOVERY (2006)
 AJ1998
 AJ1998'RECOVERY NOTE BY US POWER SQUADRON 2006 (JCH)
 AJ1998'RECOVERED IN GOOD CONDITION.
 AJ1998
 AJ1998                          STATION RECOVERY (2008)
 AJ1998
 AJ1998'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 AJ1998'RECOVERED AS DESCRIBED.
 AJ1998
 AJ1998                          STATION RECOVERY (2009)
 AJ1998
 AJ1998'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 AJ1998'RECOVERED IN GOOD CONDITION.
 AJ1998
 AJ1998                          STATION RECOVERY (2012)
 AJ1998
 AJ1998'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 AJ1998'RECOVERED AS DESCRIBED.
 AJ1998
 AJ1998                          STATION RECOVERY (2014)
 AJ1998
 AJ1998'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 AJ1998'RECOVERED IN GOOD CONDITION.
 AJ1998'
 AJ1998'NOTE-THE MARK IS 2 1/2 INCHES (6 CM) IN DIAMETER AND ITS CENTER IS 15
 AJ1998'1/4 INCHES (39 CM) SOUTHWEST OF THE CORNER OF THE MONUMENT.  NEW
 AJ1998'LARGER PVC PIPE WAS INSTALLED TO REPLACE OLDER PIPE THAT WAS TOO SMALL
 AJ1998'FOR A LEVEL ROD TO FIT INSIDE.  THE LOGO CAP WAS NEWLY STAMPED IN 2014
 AJ1998'AND REPLACED FLUSH WITH THE PAVERS.  THE MARK ITSELF WAS ALSO STAMPED
 AJ1998'IN 2014.
 AJ1998'
 AJ1998'THE FOLLOWING IS ONLY NOTICEABLE WHEN THE PAVERS AND PVC ARE REMOVED
 AJ1998'AND THE LEVEL OF THE MARK IS ACCESSIBLE.  THE MARK IS NEIGHBORED BY A
 AJ1998'LARGE METAL EYEBOLT SITTING ABOUT 6 INCHES (15 CM) SOUTHWEST OF THE
 AJ1998'MARK CENTER.  THE MARK ALSO HAS A HOLE 3 INCHES (8 CM) DIAMETER
 AJ1998'SITTING 6 1/2 INCHES (17 CM) CLOSER TO THE SOUTHWEST CORNER THAN THE
 AJ1998'MARK ITSELF.  THIS HOLE IS 4 INCHES (10 CM) DEEP.
 AJ1998
 AJ1998                          STATION RECOVERY (2021)
 AJ1998
 AJ1998'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 AJ1998'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI4420 ***********************************************************************
 AI4420  DESIGNATION -  W M EAST
 AI4420  PID         -  AI4420
 AI4420  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI4420  COUNTRY     -  US
 AI4420  USGS QUAD   -  WASHINGTON WEST (2016)
 AI4420
 AI4420                         *CURRENT SURVEY CONTROL
 AI4420  ______________________________________________________________________
 AI4420* NAD 83(2011) POSITION- 38 53 26.08230(N) 077 01 40.64755(W)   ADJUSTED
 AI4420* NAD 83(2011) ELLIP HT-   -23.945 (meters)        (06/27/12)   ADJUSTED
 AI4420* NAD 83(2011) EPOCH   -  2010.00
 AI4420* NAVD 88 ORTHO HEIGHT -     8.157 (meters)       26.76  (feet) ADJUSTED
 AI4420  ______________________________________________________________________
 AI4420  GEOID HEIGHT    -        -32.096 (meters)                     GEOID18
 AI4420  NAD 83(2011) X  -  1,115,855.602 (meters)                     COMP
 AI4420  NAD 83(2011) Y  - -4,844,084.355 (meters)                     COMP
 AI4420  NAD 83(2011) Z  -  3,982,854.411 (meters)                     COMP
 AI4420  LAPLACE CORR    -         -2.71  (seconds)                    DEFLEC18
 AI4420  DYNAMIC HEIGHT  -          8.153 (meters)       26.75  (feet) COMP
 AI4420  MODELED GRAVITY -    980,098.8   (mgal)                       NAVD 88
 AI4420
 AI4420  VERT ORDER      -  FIRST     CLASS II
 AI4420
 AI4420  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AI4420  Standards:
 AI4420         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AI4420            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AI4420  -------------------------------------------------------------------
 AI4420  NETWORK    0.62   0.71           0.28   0.22   0.36      0.02166276
 AI4420  -------------------------------------------------------------------
 AI4420  Click here for local accuracies and other accuracy information.
 AI4420
 AI4420.The horizontal coordinates were established by GPS observations
 AI4420.and adjusted by the National Geodetic Survey in June 2012.
 AI4420
 AI4420.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AI4420.been affixed to the stable North American tectonic plate. See 
 AI4420.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AI4420
 AI4420.The horizontal coordinates are valid at the epoch date displayed above
 AI4420.which is a decimal equivalence of Year/Month/Day.
 AI4420
 AI4420.The orthometric height was determined by differential leveling and
 AI4420.adjusted by the NATIONAL GEODETIC SURVEY
 AI4420.in October 2012.
 AI4420
 AI4420.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI4420.GEOID18 height accuracy estimate available here.
 AI4420
 AI4420.Click photographs - Photos may exist for this station.
 AI4420
 AI4420.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AI4420
 AI4420.The Laplace correction was computed from DEFLEC18 derived deflections.
 AI4420
 AI4420.The ellipsoidal height was determined by GPS observations
 AI4420.and is referenced to NAD 83.
 AI4420
 AI4420.The dynamic height is computed by dividing the NAVD 88
 AI4420.geopotential number by the normal gravity value computed on the
 AI4420.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AI4420.degrees latitude (g = 980.6199 gals.).
 AI4420
 AI4420.The modeled gravity was interpolated from observed gravity values.
 AI4420
 AI4420. The following values were computed from the NAD 83(2011) position.
 AI4420
 AI4420;                    North         East     Units Scale Factor Converg.
 AI4420;UTM  18      - 4,306,588.745   324,117.584   MT  0.99998093   -1 16 24.8
 AI4420
 AI4420!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AI4420!UTM  18      -   1.00000376  x   0.99998093  =   0.99998469
 AI4420
 AI4420_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2411706588(NAD 83)
 AI4420
 AI4420                          SUPERSEDED SURVEY CONTROL
 AI4420
 AI4420  NAD 83(2007)-  38 53 26.08256(N)    077 01 40.64825(W) AD(2002.00) 0
 AI4420  ELLIP H (02/10/07)  -23.925  (m)                       GP(2002.00)    
 AI4420  NAD 83(1993)-  38 53 26.08267(N)    077 01 40.64788(W) AD(       ) A
 AI4420  ELLIP H (09/11/02)  -23.904  (m)                       GP(       ) 4 2
 AI4420  NAVD 88               8.15   (m)           26.7    (f) LEVELING    3  
 AI4420  NAVD 88 (04/19/00)    8.154  (m)           26.75   (f) SUPERSEDED  1 2
 AI4420
 AI4420.Superseded values are not recommended for survey control.
 AI4420
 AI4420.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AI4420.See file dsdata.pdf to determine how the superseded data were derived.
 AI4420
 AI4420_MARKER: DV = VERTICAL CONTROL DISK
 AI4420_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 AI4420_SP_SET: OVERPASS
 AI4420_STAMPING: W M EAST 1999
 AI4420_MARK LOGO: NGS
 AI4420_MAGNETIC: N = NO MAGNETIC MATERIAL
 AI4420_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 AI4420_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AI4420+SATELLITE: SATELLITE OBSERVATIONS - December 11, 2021
 AI4420
 AI4420  HISTORY     - Date     Condition        Report By
 AI4420  HISTORY     - 1999     MONUMENTED       NGS
 AI4420  HISTORY     - 20031230 GOOD             DMW
 AI4420  HISTORY     - 20051216 GOOD             GEOCAC
 AI4420  HISTORY     - 200812   GOOD             NGS
 AI4420  HISTORY     - 20090317 GOOD             GEOCAC
 AI4420  HISTORY     - 20100521 GOOD             GEOCAC
 AI4420  HISTORY     - 20120301 GOOD             NGS
 AI4420  HISTORY     - 20180717 GOOD             USPSQD
 AI4420  HISTORY     - 20211211 GOOD             USPSQD
 AI4420
 AI4420                          STATION DESCRIPTION
 AI4420
 AI4420'DESCRIBED BY NATIONAL GEODETIC SURVEY 1999 (RLA)
 AI4420'IN WASHINGTON, AT THE NORTHWEST CORNER OF 12TH STREET AND ALSO WEST
 AI4420'AND ACROSS A ONE WAY RAMP ROAD FROM THE NATIONAL MUSEUM OF NATURAL
 AI4420'HISTORY BUILDING, IN TOP OF A GRANITE BLOCK OVER A CONCRETE FOUNDATION
 AI4420'FOR AN OVERPASS FOR 12TH STREET. 1.4 FEET SOUTHEAST OF A STEEL GRATE
 AI4420'ACROSS, 15.4 FEET NORTHWEST OF THE CENTERLINE OF A ONE WAY RAMP ROAD
 AI4420'LEADING TO CONSTITUTION AVENUE, 38.2 FEET NORTHEAST OF THE CENTERLINE
 AI4420'OF MADISON DRIVE (ONE WAY), 25.11 FEET SOUTHEAST OF THE CENTER OF 3
 AI4420'LANES FOR 12TH STREET NORTHERLY, 1.9 FEET ABOVE SIDEWALK.
 AI4420
 AI4420                          STATION RECOVERY (2003)
 AI4420
 AI4420'RECOVERY NOTE BY DAFT MCCUNE WALKER INCORPORATED 2003 (DMM)
 AI4420'RECOVERED IN GOOD CONDITION.
 AI4420
 AI4420                          STATION RECOVERY (2005)
 AI4420
 AI4420'RECOVERY NOTE BY GEOCACHING 2005 (WD)
 AI4420'RECOVERED IN GOOD CONDITION.
 AI4420
 AI4420                          STATION RECOVERY (2008)
 AI4420
 AI4420'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 AI4420'RECOVERED AS DESCRIBED.
 AI4420
 AI4420                          STATION RECOVERY (2009)
 AI4420
 AI4420'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 AI4420'RECOVERED IN GOOD CONDITION.
 AI4420
 AI4420                          STATION RECOVERY (2010)
 AI4420
 AI4420'RECOVERY NOTE BY GEOCACHING 2010 (MTT)
 AI4420'RECOVERED IN GOOD CONDITION.
 AI4420
 AI4420                          STATION RECOVERY (2012)
 AI4420
 AI4420'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 AI4420'RECOVERED AS DESCRIBED.
 AI4420
 AI4420                          STATION RECOVERY (2018)
 AI4420
 AI4420'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 AI4420'RECOVERED IN GOOD CONDITION.
 AI4420
 AI4420                          STATION RECOVERY (2021)
 AI4420
 AI4420'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 AI4420'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DP2632 ***********************************************************************
 DP2632  DESIGNATION -  W M FLOOR 1
 DP2632  PID         -  DP2632
 DP2632  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DP2632  COUNTRY     -  US
 DP2632  USGS QUAD   -  WASHINGTON WEST (2016)
 DP2632
 DP2632                         *CURRENT SURVEY CONTROL
 DP2632  ______________________________________________________________________
 DP2632* NAD 83(1986) POSITION- 38 53 21.81   (N) 077 02 07.13   (W)   HD_HELD1
 DP2632* NAVD 88 ORTHO HEIGHT -    12.387 (meters)       40.64  (feet) ADJUSTED
 DP2632  ______________________________________________________________________
 DP2632  GEOID HEIGHT    -        -32.089 (meters)                     GEOID18
 DP2632  DYNAMIC HEIGHT  -         12.381 (meters)       40.62  (feet) COMP
 DP2632  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 DP2632
 DP2632  VERT ORDER      -  FIRST     CLASS II
 DP2632
 DP2632.The horizontal coordinates were determined by differentially corrected
 DP2632.hand held GPS observations or other comparable positioning techniques
 DP2632.and have an estimated accuracy of +/- 3 meters.
 DP2632
 DP2632.The orthometric height was determined by differential leveling and
 DP2632.adjusted by the NATIONAL GEODETIC SURVEY
 DP2632.in February 2015.
 DP2632
 DP2632.Significant digits in the geoid height do not necessarily reflect accuracy.
 DP2632.GEOID18 height accuracy estimate available here.
 DP2632
 DP2632.Click photographs - Photos may exist for this station.
 DP2632
 DP2632.The dynamic height is computed by dividing the NAVD 88
 DP2632.geopotential number by the normal gravity value computed on the
 DP2632.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DP2632.degrees latitude (g = 980.6199 gals.).
 DP2632
 DP2632.The modeled gravity was interpolated from observed gravity values.
 DP2632
 DP2632
 DP2632_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2347606471(NAD 83)
 DP2632
 DP2632                          SUPERSEDED SURVEY CONTROL
 DP2632
 DP2632.No superseded survey control is available for this station.
 DP2632
 DP2632_MARKER: Z = SEE DESCRIPTION
 DP2632_SETTING: 40 = SET IN A LARGE STRUCTURE WITH DEEP FOUNDATIONS
 DP2632_SP_SET: MOSAIC FLOOR INSIDE MONUMENT
 DP2632_MAGNETIC: N = NO MAGNETIC MATERIAL
 DP2632_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 DP2632+STABILITY: POSITION/ELEVATION WELL
 DP2632_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 DP2632+SATELLITE: SATELLITE OBSERVATIONS - April 23, 2014
 DP2632
 DP2632  HISTORY     - Date     Condition        Report By
 DP2632  HISTORY     - 20140423 MONUMENTED       NGS
 DP2632
 DP2632                          STATION DESCRIPTION
 DP2632
 DP2632'DESCRIBED BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 DP2632'AT WASHINGTON D.C., AT AND INSIDE THE WASHINGTON MONUMENT.
 DP2632'
 DP2632'THE POINT IS THE EAST (BOTTOM) TIP OF THE FLAG-SHIELD ON THE MOSAIC
 DP2632'FLOOR IN THE ALCOVE WHICH HOLDS THE STATUE OF GEORGE WASHINGTON.
 DP2632'
 DP2632'IT IS 31 3/8 INCHES (80 CM) FROM THE SOUTHEAST CORNER OF THE PEDESTAL
 DP2632'UPON WHICH THE STATUE STANDS, 31 5/8 INCHES (80 CM) FROM THE NORTHEAST
 DP2632'CORNER OF SAID PEDESTAL, 24 1/2 INCHES (62 CM) DUE EAST OF THE EAST
 DP2632'FACE OF SAID PEDESTAL AND 39 5/8 INCHES (101 CM) DUE SOUTH OF THE
 DP2632'NORTH WALL OF THE ALCOVE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DP2633 ***********************************************************************
 DP2633  DESIGNATION -  W M FLOOR 2
 DP2633  PID         -  DP2633
 DP2633  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DP2633  COUNTRY     -  US
 DP2633  USGS QUAD   -  WASHINGTON WEST (2016)
 DP2633
 DP2633                         *CURRENT SURVEY CONTROL
 DP2633  ______________________________________________________________________
 DP2633* NAD 83(1986) POSITION- 38 53 21.81   (N) 077 02 06.68   (W)   HD_HELD1
 DP2633* NAVD 88 ORTHO HEIGHT -    12.354 (meters)       40.53  (feet) ADJUSTED
 DP2633  ______________________________________________________________________
 DP2633  GEOID HEIGHT    -        -32.089 (meters)                     GEOID18
 DP2633  DYNAMIC HEIGHT  -         12.348 (meters)       40.51  (feet) COMP
 DP2633  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 DP2633
 DP2633  VERT ORDER      -  FIRST     CLASS II
 DP2633
 DP2633.The horizontal coordinates were determined by differentially corrected
 DP2633.hand held GPS observations or other comparable positioning techniques
 DP2633.and have an estimated accuracy of +/- 3 meters.
 DP2633
 DP2633.The orthometric height was determined by differential leveling and
 DP2633.adjusted by the NATIONAL GEODETIC SURVEY
 DP2633.in February 2015.
 DP2633
 DP2633.Significant digits in the geoid height do not necessarily reflect accuracy.
 DP2633.GEOID18 height accuracy estimate available here.
 DP2633
 DP2633.Click photographs - Photos may exist for this station.
 DP2633
 DP2633.The dynamic height is computed by dividing the NAVD 88
 DP2633.geopotential number by the normal gravity value computed on the
 DP2633.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DP2633.degrees latitude (g = 980.6199 gals.).
 DP2633
 DP2633.The modeled gravity was interpolated from observed gravity values.
 DP2633
 DP2633
 DP2633_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2348706471(NAD 83)
 DP2633
 DP2633                          SUPERSEDED SURVEY CONTROL
 DP2633
 DP2633.No superseded survey control is available for this station.
 DP2633
 DP2633_MARKER: Z = SEE DESCRIPTION
 DP2633_SETTING: 40 = SET IN A LARGE STRUCTURE WITH DEEP FOUNDATIONS
 DP2633_SP_SET: TILE FLOOR
 DP2633_MAGNETIC: N = NO MAGNETIC MATERIAL
 DP2633_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 DP2633+STABILITY: POSITION/ELEVATION WELL
 DP2633_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 DP2633+SATELLITE: SATELLITE OBSERVATIONS - April 23, 2014
 DP2633
 DP2633  HISTORY     - Date     Condition        Report By
 DP2633  HISTORY     - 20140423 MONUMENTED       NGS
 DP2633
 DP2633                          STATION DESCRIPTION
 DP2633
 DP2633'DESCRIBED BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 DP2633'AT WASHINGTON D.C., AT AND INSIDE THE WASHINTON MONUMENT.
 DP2633'
 DP2633'THE POINT IS ON THE TILE FLOOR WHICH SURROUNDS THE EAST SIDE OF THE
 DP2633'ELEVATOR.  IT IS AT THE HALFWAY POINT OF A 5 1/2 INCH (14 CM) WIDE
 DP2633'VERTICAL DECORATIVE MOLDING THAT IS ON THE NORTH SIDE OF THE ELEVATOR
 DP2633'DOOR, JUST NORTH OF THE CURVE.  WHEN STANDING ON THE EAST SIDE OF THE
 DP2633'ELEVATOR AND FACING THE ELEVATOR DOOR, THE POINT IS AHEAD AND TO THE
 DP2633'RIGHT ON THE FLOOR AGAINST THE WALL.
 DP2633'
 DP2633'IT IS 72 1/2 INCHES (184 CM) FROM THE WEST EDGE OF THE NORTH WALL OF
 DP2633'THE RAMP LEADING UP TO THE ELEVATOR AND 107 1/4 INCHES (272 CM) FROM
 DP2633'THE WEST EDGE OF THE SOUTH WALL OF THE SAME RAMP.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DP2634 ***********************************************************************
 DP2634  DESIGNATION -  W M FLOOR 3
 DP2634  PID         -  DP2634
 DP2634  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DP2634  COUNTRY     -  US
 DP2634  USGS QUAD   -  WASHINGTON WEST (2016)
 DP2634
 DP2634                         *CURRENT SURVEY CONTROL
 DP2634  ______________________________________________________________________
 DP2634* NAD 83(1986) POSITION- 38 53 22.05   (N) 077 02 06.45   (W)   HD_HELD1
 DP2634* NAVD 88 ORTHO HEIGHT -    12.216 (meters)       40.08  (feet) ADJUSTED
 DP2634  ______________________________________________________________________
 DP2634  GEOID HEIGHT    -        -32.089 (meters)                     GEOID18
 DP2634  DYNAMIC HEIGHT  -         12.209 (meters)       40.06  (feet) COMP
 DP2634  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 DP2634
 DP2634  VERT ORDER      -  FIRST     CLASS II
 DP2634
 DP2634.The horizontal coordinates were determined by differentially corrected
 DP2634.hand held GPS observations or other comparable positioning techniques
 DP2634.and have an estimated accuracy of +/- 3 meters.
 DP2634
 DP2634.The orthometric height was determined by differential leveling and
 DP2634.adjusted by the NATIONAL GEODETIC SURVEY
 DP2634.in February 2015.
 DP2634
 DP2634.Significant digits in the geoid height do not necessarily reflect accuracy.
 DP2634.GEOID18 height accuracy estimate available here.
 DP2634
 DP2634.Click photographs - Photos may exist for this station.
 DP2634
 DP2634.The dynamic height is computed by dividing the NAVD 88
 DP2634.geopotential number by the normal gravity value computed on the
 DP2634.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DP2634.degrees latitude (g = 980.6199 gals.).
 DP2634
 DP2634.The modeled gravity was interpolated from observed gravity values.
 DP2634
 DP2634
 DP2634_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2349306478(NAD 83)
 DP2634
 DP2634                          SUPERSEDED SURVEY CONTROL
 DP2634
 DP2634.No superseded survey control is available for this station.
 DP2634
 DP2634_MARKER: Z = SEE DESCRIPTION
 DP2634_SETTING: 40 = SET IN A LARGE STRUCTURE WITH DEEP FOUNDATIONS
 DP2634_SP_SET: TILE FLOOR
 DP2634_MAGNETIC: N = NO MAGNETIC MATERIAL
 DP2634_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 DP2634+STABILITY: POSITION/ELEVATION WELL
 DP2634
 DP2634  HISTORY     - Date     Condition        Report By
 DP2634  HISTORY     - 20140423 MONUMENTED       NGS
 DP2634
 DP2634                          STATION DESCRIPTION
 DP2634
 DP2634'DESCRIBED BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 DP2634'AT WASHINGTON D.C., AT AND INSIDE THE WASHINGTON MONUMENT.
 DP2634'
 DP2634'THE POINT IS AT THE THRESHOLD OF THE ENTRYWAY TO THE ORIGINAL MONUMENT
 DP2634'(DISREGARDING THE VISITOR STRUCTURE ATTACHED TO THAT ENTRYWAY ON THE
 DP2634'EAST SIDE OF THE MONUMENT).  IT IS ON THE TILE FLOOR, AT THE BASE OF
 DP2634'THE RAMP JUST EAST OF A NORTH-SOUTH GROUT LINE WHICH RUNS EXACTLY AT
 DP2634'THE ENTRYWAY AND IS HALFWAY BETWEEN THE NORTH AND SOUTH WALLS OF THE
 DP2634'ENTRYWAY.
 DP2634'
 DP2634'IT IS 268 INCHES (681 CM) DUE EAST OF THE EDGE BETWEEN THE TILE FLOOR
 DP2634'AND THE EAST DOOR JAM OF THE ELEVATOR AND 36 1/8 INCHES (92 CM) DUE
 DP2634'NORTH OF THE EAST EDGE OF THE SOUTH WALL OF THE SMALL INDENTATION IN
 DP2634'WHICH THE SOUTH GATE IS MOUNTED.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DP2635 ***********************************************************************
 DP2635  DESIGNATION -  W M FLOOR 4
 DP2635  PID         -  DP2635
 DP2635  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DP2635  COUNTRY     -  US
 DP2635  USGS QUAD   -  WASHINGTON WEST (2016)
 DP2635
 DP2635                         *CURRENT SURVEY CONTROL
 DP2635  ______________________________________________________________________
 DP2635* NAD 83(1986) POSITION- 38 53 22.02   (N) 077 02 06.25   (W)   HD_HELD1
 DP2635* NAVD 88 ORTHO HEIGHT -    12.101 (meters)       39.70  (feet) ADJUSTED
 DP2635  ______________________________________________________________________
 DP2635  GEOID HEIGHT    -        -32.089 (meters)                     GEOID18
 DP2635  DYNAMIC HEIGHT  -         12.094 (meters)       39.68  (feet) COMP
 DP2635  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 DP2635
 DP2635  VERT ORDER      -  FIRST     CLASS II
 DP2635
 DP2635.The horizontal coordinates were determined by differentially corrected
 DP2635.hand held GPS observations or other comparable positioning techniques
 DP2635.and have an estimated accuracy of +/- 3 meters.
 DP2635
 DP2635.The orthometric height was determined by differential leveling and
 DP2635.adjusted by the NATIONAL GEODETIC SURVEY
 DP2635.in February 2015.
 DP2635
 DP2635.Significant digits in the geoid height do not necessarily reflect accuracy.
 DP2635.GEOID18 height accuracy estimate available here.
 DP2635
 DP2635.Click photographs - Photos may exist for this station.
 DP2635
 DP2635.The dynamic height is computed by dividing the NAVD 88
 DP2635.geopotential number by the normal gravity value computed on the
 DP2635.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DP2635.degrees latitude (g = 980.6199 gals.).
 DP2635
 DP2635.The modeled gravity was interpolated from observed gravity values.
 DP2635
 DP2635
 DP2635_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2349706477(NAD 83)
 DP2635
 DP2635                          SUPERSEDED SURVEY CONTROL
 DP2635
 DP2635.No superseded survey control is available for this station.
 DP2635
 DP2635_MARKER: Z = SEE DESCRIPTION
 DP2635_SETTING: 0 = UNSPECIFIED SETTING
 DP2635_MAGNETIC: N = NO MAGNETIC MATERIAL
 DP2635_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 DP2635
 DP2635  HISTORY     - Date     Condition        Report By
 DP2635  HISTORY     - 20140423 MONUMENTED       NGS
 DP2635
 DP2635                          STATION DESCRIPTION
 DP2635
 DP2635'DESCRIBED BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 DP2635'AT WASHINGTON D.C., AT THE WASHINGTON MONUMENT, INSIDE THE STRUCTURE
 DP2635'WHICH ABUTS THE MONUMENT ON ITS EAST SIDE TO ACCOMMODATE SECURITY
 DP2635'SCREENING FOR ENTRY TO THE MONUMENT.
 DP2635'
 DP2635'THE POINT IS AT THE EASTERN DOOR ON THE SOUTH WALL OF THE STRUCTURE.
 DP2635'IT IS ON THE FLOOR, JUST INSIDE OF THE DOORWAY, ON THE TILE FLOOR AND
 DP2635'JUST WEST OF A SOUTHWEST-NORTHEAST RUNNING GROUT LINE WHICH INTERSECTS
 DP2635'NEAR THE MIDDLE OF THE DOOR JAM.
 DP2635'
 DP2635'IT IS 40 1/2 INCHES (103 CM) WEST OF THE EAST WALL OF THE STRUCTURE
 DP2635'AND 274 INCHES (696 CM) NEARLY DUE WEST OF THE INTERSECTION THE DARK
 DP2635'GRAY PAVER CIRCLE AND A GROUT LINE WHICH RUNS EAST-SOUTHEAST AND IS
 DP2635'THE FOURTH SUCH LINE, BEGINNING WITH THE GROUT LINE WHICH RUNS DUE
 DP2635'EAST IN THE PAVERS AND COUNTING SOUTH (CLOCKWISE).
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DP2631 ***********************************************************************
 DP2631  DESIGNATION -  W M ROD NW
 DP2631  PID         -  DP2631
 DP2631  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DP2631  COUNTRY     -  US
 DP2631  USGS QUAD   -  WASHINGTON WEST (2016)
 DP2631
 DP2631                         *CURRENT SURVEY CONTROL
 DP2631  ______________________________________________________________________
 DP2631* NAD 83(1986) POSITION- 38 53 22.     (N) 077 02 07.     (W)   SCALED
 DP2631* NAVD 88 ORTHO HEIGHT -    11.982 (meters)       39.31  (feet) ADJUSTED
 DP2631  ______________________________________________________________________
 DP2631  GEOID HEIGHT    -        -32.088 (meters)                     GEOID18
 DP2631  DYNAMIC HEIGHT  -         11.976 (meters)       39.29  (feet) COMP
 DP2631  MODELED GRAVITY -    980,097.8   (mgal)                       NAVD 88
 DP2631
 DP2631  VERT ORDER      -  FIRST     CLASS II
 DP2631
 DP2631.The horizontal coordinates were scaled from a map and have
 DP2631.an estimated accuracy of +/- 6 seconds.
 DP2631
 DP2631.The orthometric height was determined by differential leveling and
 DP2631.adjusted by the NATIONAL GEODETIC SURVEY
 DP2631.in February 2015.
 DP2631
 DP2631.Significant digits in the geoid height do not necessarily reflect accuracy.
 DP2631.GEOID18 height accuracy estimate available here.
 DP2631
 DP2631.Click photographs - Photos may exist for this station.
 DP2631
 DP2631.The dynamic height is computed by dividing the NAVD 88
 DP2631.geopotential number by the normal gravity value computed on the
 DP2631.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DP2631.degrees latitude (g = 980.6199 gals.).
 DP2631
 DP2631.The modeled gravity was interpolated from observed gravity values.
 DP2631
 DP2631
 DP2631_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234064(NAD 83)
 DP2631
 DP2631                          SUPERSEDED SURVEY CONTROL
 DP2631
 DP2631.No superseded survey control is available for this station.
 DP2631
 DP2631_MARKER: I = METAL ROD
 DP2631_SETTING: 40 = SET IN A LARGE STRUCTURE WITH DEEP FOUNDATIONS
 DP2631_SP_SET: BUILDING FOUNDATION
 DP2631_MAGNETIC: N = NO MAGNETIC MATERIAL
 DP2631_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 DP2631+STABILITY: POSITION/ELEVATION WELL
 DP2631
 DP2631  HISTORY     - Date     Condition        Report By
 DP2631  HISTORY     - UNK      MONUMENTED
 DP2631  HISTORY     - 20140407 GOOD             NGS
 DP2631
 DP2631                          STATION DESCRIPTION
 DP2631
 DP2631'DESCRIBED BY NATIONAL GEODETIC SURVEY 2014 (DAS)
 DP2631'IN WASHINGTON D.C.  AT THE WASHINGTON MONUMENT.
 DP2631'
 DP2631'THE MARK IS THE TOP SURFACE OF AN IRON ROD SET VERTICALLY NEAR THE
 DP2631'NORTHWEST CORNER OF THE MONUMENT.
 DP2631'
 DP2631'IT IS 4 1/2 INCHES (11 CM) SOUTH OF THE CENTER OF NEIGHBORING MARK
 DP2631'W M CASEY NORTHWEST.  THE ROD IS APPROXIMATELY 3/4 INCHES (2 CM) IN
 DP2631'DIAMETER.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI4422 ***********************************************************************
 AI4422  DESIGNATION -  W M SOUTH
 AI4422  PID         -  AI4422
 AI4422  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI4422  COUNTRY     -  US
 AI4422  USGS QUAD   -  WASHINGTON WEST (2016)
 AI4422
 AI4422                         *CURRENT SURVEY CONTROL
 AI4422  ______________________________________________________________________
 AI4422* NAD 83(2011) POSITION- 38 53 06.79532(N) 077 02 11.73535(W)   ADJUSTED
 AI4422* NAD 83(2011) ELLIP HT-   -30.454 (meters)        (06/27/12)   ADJUSTED
 AI4422* NAD 83(2011) EPOCH   -  2010.00
 AI4422* NAVD 88 ORTHO HEIGHT -     1.540 (meters)        5.05  (feet) ADJUSTED
 AI4422  ______________________________________________________________________
 AI4422  GEOID HEIGHT    -        -32.095 (meters)                     GEOID18
 AI4422  NAD 83(2011) X  -  1,115,208.124 (meters)                     COMP
 AI4422  NAD 83(2011) Y  - -4,844,611.410 (meters)                     COMP
 AI4422  NAD 83(2011) Z  -  3,982,387.385 (meters)                     COMP
 AI4422  LAPLACE CORR    -         -2.59  (seconds)                    DEFLEC18
 AI4422  DYNAMIC HEIGHT  -          1.539 (meters)        5.05  (feet) COMP
 AI4422  MODELED GRAVITY -    980,097.4   (mgal)                       NAVD 88
 AI4422
 AI4422  VERT ORDER      -  FIRST     CLASS II
 AI4422
 AI4422  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AI4422  Standards:
 AI4422         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AI4422            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AI4422  -------------------------------------------------------------------
 AI4422  NETWORK    0.74   0.73           0.33   0.27   0.37      0.01904206
 AI4422  -------------------------------------------------------------------
 AI4422  Click here for local accuracies and other accuracy information.
 AI4422
 AI4422.The horizontal coordinates were established by GPS observations
 AI4422.and adjusted by the National Geodetic Survey in June 2012.
 AI4422
 AI4422.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AI4422.been affixed to the stable North American tectonic plate. See 
 AI4422.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AI4422
 AI4422.The horizontal coordinates are valid at the epoch date displayed above
 AI4422.which is a decimal equivalence of Year/Month/Day.
 AI4422
 AI4422.The orthometric height was determined by differential leveling and
 AI4422.adjusted by the NATIONAL GEODETIC SURVEY
 AI4422.in October 2012.
 AI4422
 AI4422.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI4422.GEOID18 height accuracy estimate available here.
 AI4422
 AI4422.Click photographs - Photos may exist for this station.
 AI4422
 AI4422.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AI4422
 AI4422.The Laplace correction was computed from DEFLEC18 derived deflections.
 AI4422
 AI4422.The ellipsoidal height was determined by GPS observations
 AI4422.and is referenced to NAD 83.
 AI4422
 AI4422.The dynamic height is computed by dividing the NAVD 88
 AI4422.geopotential number by the normal gravity value computed on the
 AI4422.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AI4422.degrees latitude (g = 980.6199 gals.).
 AI4422
 AI4422.The modeled gravity was interpolated from observed gravity values.
 AI4422
 AI4422. The following values were computed from the NAD 83(2011) position.
 AI4422
 AI4422;                    North         East     Units Scale Factor Converg.
 AI4422;UTM  18      - 4,306,010.836   323,355.296   MT  0.99998424   -1 16 43.8
 AI4422
 AI4422!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AI4422!UTM  18      -   1.00000478  x   0.99998424  =   0.99998902
 AI4422
 AI4422:                Primary Azimuth Mark                     Grid Az
 AI4422:UTM  18      -  WASHINGTON MONUMENT                      015 15 45.0
 AI4422
 AI4422_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2335506010(NAD 83)
 AI4422
 AI4422|---------------------------------------------------------------------|
 AI4422| PID    Reference Object                     Distance      Geod. Az  |
 AI4422|                                                           dddmmss.s |
 AI4422| HV4442 WASHINGTON MONUMENT                 485.812 METERS 0135901.2 |
 AI4422|---------------------------------------------------------------------|
 AI4422
 AI4422                          SUPERSEDED SURVEY CONTROL
 AI4422
 AI4422  NAD 83(2007)-  38 53 06.79558(N)    077 02 11.73604(W) AD(2002.00) 0
 AI4422  ELLIP H (02/10/07)  -30.434  (m)                       GP(2002.00)    
 AI4422  NAD 83(1993)-  38 53 06.79569(N)    077 02 11.73566(W) AD(       ) A
 AI4422  ELLIP H (09/11/02)  -30.414  (m)                       GP(       ) 4 2
 AI4422  NAVD 88 (04/20/10)    1.550  (m)            5.09   (f) SUPERSEDED  1 2
 AI4422  NAVD 88               1.64   (m)            5.4    (f) LEVELING    3  
 AI4422  NAVD 88 (04/19/00)    1.644  (m)            5.39   (f) SUPERSEDED  1 2
 AI4422
 AI4422.Superseded values are not recommended for survey control.
 AI4422
 AI4422.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AI4422.See file dsdata.pdf to determine how the superseded data were derived.
 AI4422
 AI4422_MARKER: DV = VERTICAL CONTROL DISK
 AI4422_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 AI4422_SP_SET: SIDEWALK
 AI4422_STAMPING: W M SOUTH 1999
 AI4422_MARK LOGO: NGS
 AI4422_MAGNETIC: N = NO MAGNETIC MATERIAL
 AI4422_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 AI4422_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AI4422+SATELLITE: SATELLITE OBSERVATIONS - March 29, 2018
 AI4422
 AI4422  HISTORY     - Date     Condition        Report By
 AI4422  HISTORY     - 1999     MONUMENTED       NGS
 AI4422  HISTORY     - 20020902 GOOD             INDIV
 AI4422  HISTORY     - 20031219 GOOD             ENGGRO
 AI4422  HISTORY     - 20051216 GOOD             GEOCAC
 AI4422  HISTORY     - 20080307 GOOD             INDIV
 AI4422  HISTORY     - 20081222 GOOD             NGS
 AI4422  HISTORY     - 20100314 GOOD             GEOCAC
 AI4422  HISTORY     - 20120301 GOOD             NGS
 AI4422  HISTORY     - 20180329 GOOD             BASE9
 AI4422
 AI4422                          STATION DESCRIPTION
 AI4422
 AI4422'DESCRIBED BY NATIONAL GEODETIC SURVEY 1999 (RLA)
 AI4422'FROM THE Y JUNCTION OF MAIN AVENUE AND INDEPENDENCE AVENUE, BEAR RIGHT
 AI4422'ON MAIN AVENUE FOR 0.2 MILE (0.3 KM) SOUTHEAST TO THE ENTRANCE TO THE
 AI4422'PARKING AREA FOR THE TIDAL BASIN, THENCE WEST-SOUTHWEST ALONG PARKING
 AI4422'AREA PAVED ROAD FOR 0.1 MILE (0.2 KM) TO MARK ON LEFT IN SIDEWALK.
 AI4422'6.11 FEET (1.86 M) EAST OF EDGE OF SIDEWALK, 6.0 FEET (1.8 M) EAST OF
 AI4422'ROUND STEEL HANDRAIL, 63.4 FEET (19.3 M) WEST OF WEST CURB OF PARKING
 AI4422'LOT, 49.0 FEET (14.9 M) SOUTH OF A 12 INCH CHERRY TREE, 58.9 FEET
 AI4422'(18.0 M) NORTH OF A 10 INCH CHERRY TREE, IN THE SIDEWALK OVER A
 AI4422'SEAWALL FOR THE EAST SIDE OF TIDAL BASIN.
 AI4422
 AI4422                          STATION RECOVERY (2002)
 AI4422
 AI4422'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2002 (APC)
 AI4422'RECOVERED IN GOOD CONDITION.
 AI4422
 AI4422                          STATION RECOVERY (2003)
 AI4422
 AI4422'RECOVERY NOTE BY THE ENGINEERING GROUPE INC 2003 (BWJ)
 AI4422'RECOVERED IN GOOD CONDITION.
 AI4422
 AI4422                          STATION RECOVERY (2005)
 AI4422
 AI4422'RECOVERY NOTE BY GEOCACHING 2005 (WD)
 AI4422'RECOVERED IN GOOD CONDITION.
 AI4422
 AI4422                          STATION RECOVERY (2008)
 AI4422
 AI4422'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2008
 AI4422'DESCRIPTION IS ADEQUATE
 AI4422
 AI4422                          STATION RECOVERY (2008)
 AI4422
 AI4422'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 AI4422'RECOVERED AS DESCRIBED.
 AI4422
 AI4422                          STATION RECOVERY (2010)
 AI4422
 AI4422'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 AI4422'RECOVERED IN GOOD CONDITION.
 AI4422
 AI4422                          STATION RECOVERY (2012)
 AI4422
 AI4422'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 AI4422'RECOVERED AS DESCRIBED.
 AI4422
 AI4422                          STATION RECOVERY (2018)
 AI4422
 AI4422'RECOVERY NOTE BY BASE 9 GEODETIC CONSULTING SERVICE 2018 (DRD)
 AI4422'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI4421 ***********************************************************************
 AI4421  DESIGNATION -  W M WEST
 AI4421  PID         -  AI4421
 AI4421  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI4421  COUNTRY     -  US
 AI4421  USGS QUAD   -  WASHINGTON WEST (2016)
 AI4421
 AI4421                         *CURRENT SURVEY CONTROL
 AI4421  ______________________________________________________________________
 AI4421* NAD 83(2011) POSITION- 38 53 20.44248(N) 077 02 21.79815(W)   ADJUSTED
 AI4421* NAD 83(2011) ELLIP HT-   -29.956 (meters)        (06/27/12)   ADJUSTED
 AI4421* NAD 83(2011) EPOCH   -  2010.00
 AI4421* NAVD 88 ORTHO HEIGHT -     2.116 (meters)        6.94  (feet) ADJUSTED
 AI4421  ______________________________________________________________________
 AI4421  GEOID HEIGHT    -        -32.084 (meters)                     GEOID18
 AI4421  NAD 83(2011) X  -  1,114,912.607 (meters)                     COMP
 AI4421  NAD 83(2011) Y  - -4,844,408.723 (meters)                     COMP
 AI4421  NAD 83(2011) Z  -  3,982,715.270 (meters)                     COMP
 AI4421  LAPLACE CORR    -         -2.46  (seconds)                    DEFLEC18
 AI4421  DYNAMIC HEIGHT  -          2.115 (meters)        6.94  (feet) COMP
 AI4421  MODELED GRAVITY -    980,097.1   (mgal)                       NAVD 88
 AI4421
 AI4421  VERT ORDER      -  FIRST     CLASS II
 AI4421
 AI4421  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 AI4421  Standards:
 AI4421         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 AI4421            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 AI4421  -------------------------------------------------------------------
 AI4421  NETWORK    0.64   0.73           0.29   0.22   0.37      0.08202426
 AI4421  -------------------------------------------------------------------
 AI4421  Click here for local accuracies and other accuracy information.
 AI4421
 AI4421.The horizontal coordinates were established by GPS observations
 AI4421.and adjusted by the National Geodetic Survey in June 2012.
 AI4421
 AI4421.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 AI4421.been affixed to the stable North American tectonic plate. See 
 AI4421.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 AI4421
 AI4421.The horizontal coordinates are valid at the epoch date displayed above
 AI4421.which is a decimal equivalence of Year/Month/Day.
 AI4421
 AI4421.The orthometric height was determined by differential leveling and
 AI4421.adjusted by the NATIONAL GEODETIC SURVEY
 AI4421.in October 2012.
 AI4421
 AI4421.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI4421.GEOID18 height accuracy estimate available here.
 AI4421
 AI4421.Click photographs - Photos may exist for this station.
 AI4421
 AI4421.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 AI4421
 AI4421.The Laplace correction was computed from DEFLEC18 derived deflections.
 AI4421
 AI4421.The ellipsoidal height was determined by GPS observations
 AI4421.and is referenced to NAD 83.
 AI4421
 AI4421.The dynamic height is computed by dividing the NAVD 88
 AI4421.geopotential number by the normal gravity value computed on the
 AI4421.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AI4421.degrees latitude (g = 980.6199 gals.).
 AI4421
 AI4421.The modeled gravity was interpolated from observed gravity values.
 AI4421
 AI4421. The following values were computed from the NAD 83(2011) position.
 AI4421
 AI4421;                    North         East     Units Scale Factor Converg.
 AI4421;UTM  18      - 4,306,436.979   323,122.235   MT  0.99998526   -1 16 50.5
 AI4421
 AI4421!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AI4421!UTM  18      -   1.00000470  x   0.99998526  =   0.99998996
 AI4421
 AI4421_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2312206436(NAD 83)
 AI4421
 AI4421|---------------------------------------------------------------------|
 AI4421| PID    Reference Object                     Distance      Geod. Az  |
 AI4421|                                                           dddmmss.s |
 AI4421| HV4442 WASHINGTON MONUMENT                 363.448 METERS 08200     |
 AI4421|---------------------------------------------------------------------|
 AI4421
 AI4421                          SUPERSEDED SURVEY CONTROL
 AI4421
 AI4421  NAD 83(2007)-  38 53 20.44273(N)    077 02 21.79885(W) AD(2002.00) 0
 AI4421  ELLIP H (02/10/07)  -29.936  (m)                       GP(2002.00)    
 AI4421  NAD 83(1993)-  38 53 20.44286(N)    077 02 21.79848(W) AD(       ) A
 AI4421  ELLIP H (09/11/02)  -29.915  (m)                       GP(       ) 4 2
 AI4421  NAVD 88 (04/20/10)    2.119  (m)            6.95   (f) SUPERSEDED  1 2
 AI4421  NAVD 88               2.13   (m)            7.0    (f) LEVELING    3  
 AI4421  NAVD 88 (04/19/00)    2.129  (m)            6.98   (f) SUPERSEDED  1 2
 AI4421
 AI4421.Superseded values are not recommended for survey control.
 AI4421
 AI4421.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 AI4421.See file dsdata.pdf to determine how the superseded data were derived.
 AI4421
 AI4421_MARKER: DV = VERTICAL CONTROL DISK
 AI4421_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 AI4421_SP_SET: CATCH BASIN
 AI4421_STAMPING: W M WEST 1999
 AI4421_MARK LOGO: NGS
 AI4421_MAGNETIC: N = NO MAGNETIC MATERIAL
 AI4421_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 AI4421_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 AI4421+SATELLITE: SATELLITE OBSERVATIONS - December 11, 2021
 AI4421
 AI4421  HISTORY     - Date     Condition        Report By
 AI4421  HISTORY     - 1999     MONUMENTED       NGS
 AI4421  HISTORY     - 20031219 GOOD             ENGGRO
 AI4421  HISTORY     - 20051216 GOOD             GEOCAC
 AI4421  HISTORY     - 20070717 GOOD             USACE
 AI4421  HISTORY     - 20071116 GOOD             PB
 AI4421  HISTORY     - 20081130 GOOD             NGS
 AI4421  HISTORY     - 20100418 GOOD             GEOCAC
 AI4421  HISTORY     - 20120301 GOOD             NGS
 AI4421  HISTORY     - 20140410 GOOD             NGS
 AI4421  HISTORY     - 20201104 GOOD             NGS
 AI4421  HISTORY     - 20211211 GOOD             USPSQD
 AI4421
 AI4421                          STATION DESCRIPTION
 AI4421
 AI4421'DESCRIBED BY NATIONAL GEODETIC SURVEY 1999 (RLA)
 AI4421'0.1 MILE (0.2 KM) NORTH ALONG 17TH STREET.  FROM THE JUNCTION OF
 AI4421'INDEPENDENCE AVENUE (WESTBOUND) IN THE TOP OF THE NORTHEAST CONCRETE
 AI4421'CORNER OF A CATCH BASIN WITH A STEEL SEWER COVER.  11.2 FEET (3.4 M)
 AI4421'WEST OF WEST EDGE OF SIDEWALK, 4.2 FEET (1.3 M) SOUTH OF A FIRE
 AI4421'HYDRANT, 19.4 FEET (5.9 M) NORTH OF A STEEL POLE WITH SIGNAL LIGHTS,
 AI4421'26.0 FEET (7.9 M) EAST OF CENTERLINE OF 4 LANES FOR 17TH STREET, 4.0
 AI4421'FEET (1.2 M) EAST OF EAST CURB.
 AI4421
 AI4421                          STATION RECOVERY (2003)
 AI4421
 AI4421'RECOVERY NOTE BY THE ENGINEERING GROUPE INC 2003 (BWJ)
 AI4421'RECOVERED IN GOOD CONDITION.
 AI4421
 AI4421                          STATION RECOVERY (2005)
 AI4421
 AI4421'RECOVERY NOTE BY GEOCACHING 2005 (WD)
 AI4421'RECOVERED IN GOOD CONDITION.
 AI4421
 AI4421                          STATION RECOVERY (2007)
 AI4421
 AI4421'RECOVERY NOTE BY US ARMY CORPS OF ENGINEERS 2007 (JBC)
 AI4421'RECOVERED IN GOOD CONDITION.
 AI4421
 AI4421                          STATION RECOVERY (2007)
 AI4421
 AI4421'RECOVERY NOTE BY PBS&J 2007
 AI4421'RECOVERED IN GOOD CONDITION.
 AI4421
 AI4421                          STATION RECOVERY (2008)
 AI4421
 AI4421'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 AI4421'RECOVERED AS DESCRIBED.
 AI4421
 AI4421                          STATION RECOVERY (2010)
 AI4421
 AI4421'RECOVERY NOTE BY GEOCACHING 2010 (GAH)
 AI4421'EXCELLENT
 AI4421
 AI4421                          STATION RECOVERY (2012)
 AI4421
 AI4421'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 AI4421'RECOVERED AS DESCRIBED.
 AI4421
 AI4421                          STATION RECOVERY (2014)
 AI4421
 AI4421'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (KF)
 AI4421'RECOVERED AS DESCRIBED.
 AI4421
 AI4421                          STATION RECOVERY (2020)
 AI4421
 AI4421'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2020 (JKH)
 AI4421'RECOVERED IN GOOD CONDITION.
 AI4421
 AI4421                          STATION RECOVERY (2021)
 AI4421
 AI4421'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 AI4421'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4435 ***********************************************************************
 HV4435  DESIGNATION -  W P P 4 PB AND PP
 HV4435  PID         -  HV4435
 HV4435  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4435  COUNTRY     -  US
 HV4435  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4435
 HV4435                         *CURRENT SURVEY CONTROL
 HV4435  ______________________________________________________________________
 HV4435* NAD 83(1993) POSITION- 38 53 04.60578(N) 077 02 45.94807(W)   ADJUSTED
 HV4435* NAVD 88 ORTHO HEIGHT -     5.    (meters)       16.    (feet) SCALED
 HV4435  ______________________________________________________________________
 HV4435  GEOID HEIGHT    -        -32.084 (meters)                     GEOID18
 HV4435  LAPLACE CORR    -         -2.58  (seconds)                    DEFLEC18
 HV4435  HORZ ORDER      -  THIRD
 HV4435
 HV4435.The horizontal coordinates were established by classical geodetic methods
 HV4435.and adjusted by the National Geodetic Survey in November 1994.
 HV4435
 HV4435.The orthometric height was scaled from a topographic map.
 HV4435
 HV4435.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4435.GEOID18 height accuracy estimate available here.
 HV4435
 HV4435.Click photographs - Photos may exist for this station.
 HV4435
 HV4435.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4435
 HV4435. The following values were computed from the NAD 83(1993) position.
 HV4435
 HV4435;                    North         East     Units Scale Factor Converg.
 HV4435;SPC MD       -   135,198.202   396,000.533   MT  0.99994986   -0 01 44.2
 HV4435;SPC MD       -   443,562.77  1,299,211.75   sFT  0.99994986   -0 01 44.2
 HV4435;SPC VA N     - 2,136,190.908 3,626,140.305   MT  0.99995922   +0 54 26.7
 HV4435;SPC VA N     - 7,008,486.34 11,896,761.98   sFT  0.99995922   +0 54 26.7
 HV4435;UTM  18      - 4,305,961.781   322,529.414   MT  0.99998785   -1 17 05.2
 HV4435
 HV4435!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4435!SPC MD       -   1.00000429  x   0.99994986  =   0.99995415
 HV4435!SPC VA N     -   1.00000429  x   0.99995922  =   0.99996351
 HV4435!UTM  18      -   1.00000429  x   0.99998785  =   0.99999214
 HV4435
 HV4435_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2252905961(NAD 83)
 HV4435
 HV4435                          SUPERSEDED SURVEY CONTROL
 HV4435
 HV4435  NAD 83(1991)-  38 53 04.60449(N)    077 02 45.94956(W) AD(       ) 3
 HV4435  NAD 83(1986)-  38 53 04.60444(N)    077 02 45.95993(W) AD(       ) 3
 HV4435  NAD 27      -  38 53 04.20500(N)    077 02 47.03600(W) AD(       ) 3
 HV4435
 HV4435.Superseded values are not recommended for survey control.
 HV4435
 HV4435.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4435.See file dsdata.pdf to determine how the superseded data were derived.
 HV4435
 HV4435_MARKER: Z = SEE DESCRIPTION
 HV4435_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4435
 HV4435  HISTORY     - Date     Condition        Report By
 HV4435  HISTORY     - 1935     MONUMENTED       CGS
 HV4435  HISTORY     - 1946     GOOD             CGS
 HV4435  HISTORY     - 20250329 MARK NOT FOUND   INDIV
 HV4435
 HV4435                          STATION DESCRIPTION
 HV4435
 HV4435'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (LOC)
 HV4435'THIS TRAVERSE STATION IS LOCATED ON N SIDE OF ROAD N OF POLO
 HV4435'FIELD ABOUT MIDWAY OF CURVE AND 3.8 FEET N OF CENTER OF
 HV4435'GUTTER.
 HV4435'
 HV4435'MARKED BY A COPPER WIRE IN 4 1/2-INCH IRON PIPE SET IN
 HV4435'CONCRETE BASE 30 INCHES IN GROUND.  TOP AT GROUND LEVEL.
 HV4435'IT IS 127.5 FEET NE OF LAMP POST NO. 423, 4.8 FEET NE OF LAMP
 HV4435'POST NO. 424, 83.8 FEET W OF CATCH BASIN IN GUTTER IN N
 HV4435'SIDE OF ROADWAY, 107.3 FEET NW OF LAMP POST NO. 425 AND 87.5
 HV4435'FEET NW OF CATCH BASIN IN GUTTER ON S SIDE OF ROADWAY.
 HV4435
 HV4435                          STATION RECOVERY (1946)
 HV4435
 HV4435'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4435'STATION RECOVERED AS DESCRIBED AND FOUND TO BE IN GOOD CONDITION.
 HV4435'DESCRIPTION IS ADEQUATE.
 HV4435
 HV4435                          STATION RECOVERY (2025)
 HV4435
 HV4435'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2025 (RF)
 HV4435'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1381 ***********************************************************************
 HV1381  DESIGNATION -  W RESET
 HV1381  PID         -  HV1381
 HV1381  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1381  COUNTRY     -  US
 HV1381  USGS QUAD   -  WASHINGTON EAST (2016)
 HV1381
 HV1381                         *CURRENT SURVEY CONTROL
 HV1381  ______________________________________________________________________
 HV1381* NAD 83(1986) POSITION- 38 52 32.6    (N) 076 59 41.0    (W)   HD_HELD2
 HV1381* NAVD 88 ORTHO HEIGHT -    11.105 (meters)       36.43  (feet) ADJUSTED
 HV1381  ______________________________________________________________________
 HV1381  GEOID HEIGHT    -        -32.179 (meters)                     GEOID18
 HV1381  DYNAMIC HEIGHT  -         11.099 (meters)       36.41  (feet) COMP
 HV1381  MODELED GRAVITY -    980,096.7   (mgal)                       NAVD 88
 HV1381
 HV1381  VERT ORDER      -  SECOND    CLASS I
 HV1381
 HV1381.The horizontal coordinates were established by autonomous hand held GPS
 HV1381.observations and have an estimated accuracy of +/- 10 meters.
 HV1381
 HV1381.The orthometric height was determined by differential leveling and
 HV1381.adjusted by the NATIONAL GEODETIC SURVEY
 HV1381.in October 2001.
 HV1381
 HV1381.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1381.GEOID18 height accuracy estimate available here.
 HV1381
 HV1381.Click photographs - Photos may exist for this station.
 HV1381
 HV1381.The dynamic height is computed by dividing the NAVD 88
 HV1381.geopotential number by the normal gravity value computed on the
 HV1381.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1381.degrees latitude (g = 980.6199 gals.).
 HV1381
 HV1381.The modeled gravity was interpolated from observed gravity values.
 HV1381
 HV1381
 HV1381_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2696404876(NAD 83)
 HV1381
 HV1381                          SUPERSEDED SURVEY CONTROL
 HV1381
 HV1381  NGVD 29 (11/26/84)   11.343  (m)           37.21   (f) ADJUSTED    2 1
 HV1381
 HV1381.Superseded values are not recommended for survey control.
 HV1381
 HV1381.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1381.See file dsdata.pdf to determine how the superseded data were derived.
 HV1381
 HV1381_MARKER: DB = BENCH MARK DISK
 HV1381_SETTING: 35 = SET IN A MAT FOUNDATION OR CONCRETE SLAB OTHER THAN
 HV1381+WITH SETTING: PAVEMENT
 HV1381_SP_SET: BELL FOUNDATION
 HV1381_STAMPING: W RESET 1955
 HV1381_MARK LOGO: CGS
 HV1381_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1381_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1381+STABILITY: SURFACE MOTION
 HV1381_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1381+SATELLITE: SATELLITE OBSERVATIONS - July 15, 2019
 HV1381
 HV1381  HISTORY     - Date     Condition        Report By
 HV1381  HISTORY     - 1955     MONUMENTED       CGS
 HV1381  HISTORY     - 19950811 GOOD             USPSQD
 HV1381  HISTORY     - 20010716 GOOD             NGS
 HV1381  HISTORY     - 20120315 GOOD             GEOCAC
 HV1381  HISTORY     - 20190715 GOOD             USPSQD
 HV1381
 HV1381                          STATION DESCRIPTION
 HV1381
 HV1381'DESCRIBED BY COAST AND GEODETIC SURVEY 1955
 HV1381'AT WASHINGTON.
 HV1381'AT WASHINGTON, AT THE NORTH END OF DAHLGREN AVENUE SOUTHEAST,
 HV1381'AT THE NORTHWEST CORNER OF LEUTZE PARK, WEST OF THE BANDSTAND,
 HV1381'AT A LARGE BELL, AND IN THE TOP OF THE NORTHWEST SIDE OF THE
 HV1381'OCTAGON-SHAPED FOUNDATION.  A STANDARD DISK, STAMPED W RESET 1955.
 HV1381
 HV1381                          STATION RECOVERY (1995)
 HV1381
 HV1381'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1381'RECOVERED IN GOOD CONDITION.
 HV1381
 HV1381                          STATION RECOVERY (2001)
 HV1381
 HV1381'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 HV1381'RECOVERED AS DESCRIBED.
 HV1381
 HV1381                          STATION RECOVERY (2012)
 HV1381
 HV1381'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV1381'RECOVERED IN GOOD CONDITION.
 HV1381
 HV1381                          STATION RECOVERY (2019)
 HV1381
 HV1381'RECOVERY NOTE BY US POWER SQUADRON 2019 (RJS)
 HV1381'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4440 ***********************************************************************
 HV4440  DESIGNATION -  WALK USE 1932
 HV4440  PID         -  HV4440
 HV4440  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4440  COUNTRY     -  US
 HV4440  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4440
 HV4440                         *CURRENT SURVEY CONTROL
 HV4440  ______________________________________________________________________
 HV4440* NAD 83(1993) POSITION- 38 52 35.62705(N) 077 02 09.25290(W)   ADJUSTED
 HV4440* NAVD 88 ORTHO HEIGHT -     1.    (meters)        3.    (feet) SCALED
 HV4440  ______________________________________________________________________
 HV4440  GEOID HEIGHT    -        -32.112 (meters)                     GEOID18
 HV4440  LAPLACE CORR    -         -2.77  (seconds)                    DEFLEC18
 HV4440  HORZ ORDER      -  THIRD
 HV4440
 HV4440.The horizontal coordinates were established by classical geodetic methods
 HV4440.and adjusted by the National Geodetic Survey in November 1994.
 HV4440
 HV4440.The orthometric height was scaled from a topographic map.
 HV4440
 HV4440.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4440.GEOID18 height accuracy estimate available here.
 HV4440
 HV4440.Click photographs - Photos may exist for this station.
 HV4440
 HV4440.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4440
 HV4440. The following values were computed from the NAD 83(1993) position.
 HV4440
 HV4440;                    North         East     Units Scale Factor Converg.
 HV4440;SPC MD       -   134,304.232   396,884.561   MT  0.99994985   -0 01 21.1
 HV4440;SPC MD       -   440,629.80  1,302,112.10   sFT  0.99994985   -0 01 21.1
 HV4440;SPC VA N     - 2,135,311.496 3,627,038.831   MT  0.99995858   +0 54 49.6
 HV4440;SPC VA N     - 7,005,601.13 11,899,709.90   sFT  0.99995858   +0 54 49.6
 HV4440;UTM  18      - 4,305,048.620   323,393.670   MT  0.99998408   -1 16 41.4
 HV4440
 HV4440!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4440!SPC MD       -   1.00000492  x   0.99994985  =   0.99995477
 HV4440!SPC VA N     -   1.00000492  x   0.99995858  =   0.99996350
 HV4440!UTM  18      -   1.00000492  x   0.99998408  =   0.99998900
 HV4440
 HV4440:                Primary Azimuth Mark                     Grid Az
 HV4440:SPC MD       -  RAIL                                     218 55 22.6
 HV4440:SPC VA N     -  RAIL                                     217 59 11.9
 HV4440:UTM  18      -  RAIL                                     220 10 42.9
 HV4440
 HV4440_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2339305048(NAD 83)
 HV4440
 HV4440|---------------------------------------------------------------------|
 HV4440| PID    Reference Object                     Distance      Geod. Az  |
 HV4440|                                                           dddmmss.s |
 HV4440| HV4604 RAIL                                APPROX. 0.8 KM 2185401.5 |
 HV4440|---------------------------------------------------------------------|
 HV4440
 HV4440                          SUPERSEDED SURVEY CONTROL
 HV4440
 HV4440  NAD 83(1991)-  38 52 35.62574(N)    077 02 09.25433(W) AD(       ) 3
 HV4440  NAD 83(1986)-  38 52 35.62547(N)    077 02 09.26511(W) AD(       ) 3
 HV4440  NAD 27      -  38 52 35.22500(N)    077 02 10.34400(W) AD(       ) 3
 HV4440
 HV4440.Superseded values are not recommended for survey control.
 HV4440
 HV4440.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4440.See file dsdata.pdf to determine how the superseded data were derived.
 HV4440
 HV4440
 HV4440  HISTORY     - Date     Condition        Report By
 HV4440  HISTORY     - 1932     MONUMENTED       CGS
 HV4440  HISTORY     - 1946     GOOD             CGS
 HV4440  HISTORY     - 1971     GOOD             NGS
 HV4440
 HV4440                          STATION DESCRIPTION
 HV4440
 HV4440'DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4440'STATION SITE IS ON THE E SHORE OF THE POTOMAC RIVER IN THE
 HV4440'DISTRICT OF COLUMBIA, IN A SECTION KNOWN AS THE EAST POTOMAC
 HV4440'PARK, NEAR THE RAILROAD BRIDGE ACROSS THE POTOMAC RIVER.
 HV4440'STATION IS A 1/4-INCH BRASS TUBE LEADED IN A 3/4-INCH DRILL
 HV4440'HOLE IN A CONCRETE SIDEWALK 48.8 FEET FROM THE FACE OF A SEA
 HV4440'WALL ON THE DOWNSTREAM SIDE OF THE WASHINGTON END OF THE
 HV4440'RAILROAD BRIDGE.  REFERENCE MONUMENT IS A STANDARD P.B. AND P.P.
 HV4440'BRASS DISK SET IN CONCRETE SIDEWALK ABOUT 3 FEET IN FROM THE
 HV4440'SEA WALL.  ELEVATION 6.98 FEET (1943).
 HV4440
 HV4440                          STATION RECOVERY (1971)
 HV4440
 HV4440'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4440'THE STATION WAS RECOVERED IN GOOD CONDITION, ALSO RECOVERED WAS
 HV4440'THE P.B. AND P.P. BRASS DISK, USED FOR REFERENCE MARK.  THE
 HV4440'GENERAL DESCRIPTION AS TO LOCATION OF STATION IS ADEQUATE.
 HV4440'HOWEVER, SOME DIFFERENCES WERE DISCOVERED IN THE MEASUREMENTS.
 HV4440'THE STATION IS IN THE SIDEWALK AS DESCRIBED, 4.88 FEET NORTHEAST
 HV4440'FROM THE FACE OF THE SEAWALL INSTEAD OF 48.8 FEET AS RECORDED IN
 HV4440'DESCRIPTION.  IT IS ALSO.  219.0 FEET SOUTHEAST OF THE SOUTH
 HV4440'FACE OF THE RAILROAD BRIDGE OVER RIVER AND SIDEWALK, AND 85.72
 HV4440'FEET NORTHWEST OF AN UNSTAMPED U.S.E. MARK DISK, THAT IS SET
 HV4440'IN THE SIDEWALK.  THIS DISK IS STATION R.R.
 HV4440'
 HV4440'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN-- IN DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4403 ***********************************************************************
 HV4403  DESIGNATION -  WALL USE 1932
 HV4403  PID         -  HV4403
 HV4403  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4403  COUNTRY     -  US
 HV4403  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4403
 HV4403                         *CURRENT SURVEY CONTROL
 HV4403  ______________________________________________________________________
 HV4403* NAD 83(1993) POSITION- 38 53 54.44705(N) 077 03 23.79501(W)   ADJUSTED
 HV4403* NAVD 88 ORTHO HEIGHT -     3.    (meters)       10.    (feet) SCALED
 HV4403  ______________________________________________________________________
 HV4403  GEOID HEIGHT    -        -32.045 (meters)                     GEOID18
 HV4403  LAPLACE CORR    -         -2.45  (seconds)                    DEFLEC18
 HV4403  HORZ ORDER      -  THIRD
 HV4403
 HV4403.The horizontal coordinates were established by classical geodetic methods
 HV4403.and adjusted by the National Geodetic Survey in November 1994.
 HV4403
 HV4403.The orthometric height was scaled from a topographic map.
 HV4403
 HV4403.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4403.GEOID18 height accuracy estimate available here.
 HV4403
 HV4403.Click photographs - Photos may exist for this station.
 HV4403
 HV4403.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4403
 HV4403. The following values were computed from the NAD 83(1993) position.
 HV4403
 HV4403;                    North         East     Units Scale Factor Converg.
 HV4403;SPC MD       -   136,735.596   395,089.348   MT  0.99994993   -0 02 07.9
 HV4403;SPC MD       -   448,606.70  1,296,222.30   sFT  0.99994993   -0 02 07.9
 HV4403;SPC VA N     - 2,137,713.221 3,625,204.108   MT  0.99996038   +0 54 03.0
 HV4403;SPC VA N     - 7,013,480.79 11,893,690.48   sFT  0.99996038   +0 54 03.0
 HV4403;UTM  18      - 4,307,518.841   321,652.113   MT  0.99999169   -1 17 30.4
 HV4403
 HV4403!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4403!SPC MD       -   1.00000459  x   0.99994993  =   0.99995452
 HV4403!SPC VA N     -   1.00000459  x   0.99996038  =   0.99996497
 HV4403!UTM  18      -   1.00000459  x   0.99999169  =   0.99999628
 HV4403
 HV4403_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2165207518(NAD 83)
 HV4403
 HV4403|---------------------------------------------------------------------|
 HV4403| PID    Reference Object                     Distance      Geod. Az  |
 HV4403|                                                           dddmmss.s |
 HV4403| HV4326 CRANFORD                            289.381 METERS 17855     |
 HV4403| HV4299 BASE                                397.854 METERS 22610     |
 HV4403| HV4400 SCOW USE 1932                       341.894 METERS 27131     |
 HV4403| HV4450 SMOOT                               334.950 METERS 32040     |
 HV4403|---------------------------------------------------------------------|
 HV4403
 HV4403                          SUPERSEDED SURVEY CONTROL
 HV4403
 HV4403  NAD 83(1991)-  38 53 54.44581(N)    077 03 23.79655(W) AD(       ) 3
 HV4403  NAD 83(1986)-  38 53 54.44547(N)    077 03 23.80705(W) AD(       ) 3
 HV4403  NAD 27      -  38 53 54.04600(N)    077 03 24.88200(W) AD(       ) 3
 HV4403
 HV4403.Superseded values are not recommended for survey control.
 HV4403
 HV4403.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4403.See file dsdata.pdf to determine how the superseded data were derived.
 HV4403
 HV4403
 HV4403  HISTORY     - Date     Condition        Report By
 HV4403  HISTORY     - 1932     MONUMENTED       CGS
 HV4403  HISTORY     - 1946     GOOD             CGS
 HV4403
 HV4403                          STATION DESCRIPTION
 HV4403
 HV4403'DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4403'STATION SITE IS ON THE E SHORE OF THE POTOMAC RIVER IN THE
 HV4403'DISTRICT OF COLUMBIA ALONG THE ROCK CREEK PARKWAY NEAR
 HV4403'THE ENTRANCE TO G STREET AND JUST BELOW THE WASHINGTON GAS
 HV4403'COMPANY PUMPHOUSE WHICH IS NEAR THE SEA WALL.
 HV4403'
 HV4403'STATION IS A STANDARD U.S.E. DISK SET IN CONCRETE IN A 4-INCH
 HV4403'CAST-IRON PIPE, 1.0 FOOT BELOW SURFACE, AND 62.55 FEET DOWN
 HV4403'RIVER FROM ANGLE IN SEA WALL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1850 ***********************************************************************
 HV1850  DESIGNATION -  WAR MEMORIAL
 HV1850  PID         -  HV1850
 HV1850  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1850  COUNTRY     -  US
 HV1850  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1850
 HV1850                         *CURRENT SURVEY CONTROL
 HV1850  ______________________________________________________________________
 HV1850* NAD 83(1986) POSITION- 38 53 15.02   (N) 077 02 36.50   (W)   HD_HELD1
 HV1850* NAVD 88 ORTHO HEIGHT -     4.273 (meters)       14.02  (feet) ADJUSTED
 HV1850  ______________________________________________________________________
 HV1850  GEOID HEIGHT    -        -32.082 (meters)                     GEOID18
 HV1850  DYNAMIC HEIGHT  -          4.271 (meters)       14.01  (feet) COMP
 HV1850  MODELED GRAVITY -    980,096.7   (mgal)                       NAVD 88
 HV1850
 HV1850  VERT ORDER      -  FIRST     CLASS II
 HV1850
 HV1850.The horizontal coordinates were determined by differentially corrected
 HV1850.hand held GPS observations or other comparable positioning techniques
 HV1850.and have an estimated accuracy of +/- 3 meters.
 HV1850
 HV1850.The orthometric height was determined by differential leveling and
 HV1850.adjusted by the NATIONAL GEODETIC SURVEY
 HV1850.in October 2012.
 HV1850
 HV1850.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1850.GEOID18 height accuracy estimate available here.
 HV1850
 HV1850.Click photographs - Photos may exist for this station.
 HV1850
 HV1850.The dynamic height is computed by dividing the NAVD 88
 HV1850.geopotential number by the normal gravity value computed on the
 HV1850.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1850.degrees latitude (g = 980.6199 gals.).
 HV1850
 HV1850.The modeled gravity was interpolated from observed gravity values.
 HV1850
 HV1850
 HV1850_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2276406277(NAD 83)
 HV1850
 HV1850                          SUPERSEDED SURVEY CONTROL
 HV1850
 HV1850  NAVD 88 (04/20/10)    4.281  (m)           14.05   (f) SUPERSEDED  1 2
 HV1850  NAVD 88 (02/03/93)    4.296  (m)           14.09   (f) SUPERSEDED  1 2
 HV1850  NAVD 88 (06/15/91)    4.302  (m)           14.11   (f) SUPERSEDED  1 2
 HV1850  NGVD 29 (08/12/92)    4.529  (m)           14.86   (f) ADJUSTED    1 2
 HV1850  NGVD 29 (??/??/87)    4.538  (m)           14.89   (f) SUPERSEDED  1 2
 HV1850
 HV1850.Superseded values are not recommended for survey control.
 HV1850
 HV1850.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1850.See file dsdata.pdf to determine how the superseded data were derived.
 HV1850
 HV1850_MARKER: Z = SEE DESCRIPTION
 HV1850_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1850_SP_SET: STEP
 HV1850_MARK LOGO: NONE
 HV1850_PROJECTION: FLUSH
 HV1850_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1850_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1850_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1850+SATELLITE: SATELLITE OBSERVATIONS - December 11, 2021
 HV1850
 HV1850  HISTORY     - Date     Condition        Report By
 HV1850  HISTORY     - UNK      MONUMENTED       CGS
 HV1850  HISTORY     - 1936     GOOD             CGS
 HV1850  HISTORY     - 1956     GOOD             CGS
 HV1850  HISTORY     - 19920513 GOOD             NGS
 HV1850  HISTORY     - 19980928 GOOD             NGS
 HV1850  HISTORY     - 20031211 GOOD             GEOCAC
 HV1850  HISTORY     - 20050718 GOOD             USPSQD
 HV1850  HISTORY     - 20061111 GOOD             USPSQD
 HV1850  HISTORY     - 20081222 GOOD             NGS
 HV1850  HISTORY     - 20090319 GOOD             GEOCAC
 HV1850  HISTORY     - 20100321 GOOD             GEOCAC
 HV1850  HISTORY     - 20120301 GOOD             NGS
 HV1850  HISTORY     - 20180718 GOOD             USPSQD
 HV1850  HISTORY     - 20211211 GOOD             USPSQD
 HV1850
 HV1850                          STATION DESCRIPTION
 HV1850
 HV1850'DESCRIBED BY COAST AND GEODETIC SURVEY 1936
 HV1850'AT WASHINGTON.
 HV1850'AT WASHINGTON, IN WEST POTOMAC PARK, IN THE GROVE BETWEEN TWO
 HV1850'ROADS LEADING WEST FROM THE FOOT OF SEVENTEENTH STREET, AT THE
 HV1850'DISTRICT OF COLUMBIA WORLD WAR MEMORIAL, AT THE STEPS ON THE
 HV1850'SOUTH SIDE OF THE MONUMENT, AND ON THE SOUTHEAST CORNER OF THE
 HV1850'FOURTH STEP FROM THE BOTTOM.  AN UNMARKED POINT.
 HV1850
 HV1850                          STATION RECOVERY (1956)
 HV1850
 HV1850'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1956
 HV1850'RECOVERED IN GOOD CONDITION.
 HV1850
 HV1850                          STATION RECOVERY (1992)
 HV1850
 HV1850'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1850'0.7 KM (0.45 MI) EASTERLY ALONG INDEPENDENCE AVENUE FROM THE LINCOLN
 HV1850'MEMORIAL IN WASHINGTON, D.C., THE POINT LEVELED IS THE SOUTHEAST
 HV1850'CORNER OF THE 4TH STEP FROM THE BOTTOM ON THE SOUTH SIDE OF THE
 HV1850'DISTRICT OF COLUMBIA WAR MEMORIAL, AND 31.1 M (102.0 FT) NORTH OF THE
 HV1850'NORTH CURB OF THE EASTBOUND LANES OF THE AVENUE.
 HV1850
 HV1850                          STATION RECOVERY (1998)
 HV1850
 HV1850'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1998 (RLA)
 HV1850'RECOVERED AS DESCRIBED.
 HV1850
 HV1850                          STATION RECOVERY (2003)
 HV1850
 HV1850'RECOVERY NOTE BY GEOCACHING 2003 (APC)
 HV1850'RECOVERED IN GOOD CONDITION.
 HV1850
 HV1850                          STATION RECOVERY (2005)
 HV1850
 HV1850'RECOVERY NOTE BY US POWER SQUADRON 2005 (FM)
 HV1850'RECOVERED IN GOOD CONDITION.
 HV1850
 HV1850                          STATION RECOVERY (2006)
 HV1850
 HV1850'RECOVERY NOTE BY US POWER SQUADRON 2006 (DEB)
 HV1850'RECOVERED IN GOOD CONDITION.
 HV1850
 HV1850                          STATION RECOVERY (2008)
 HV1850
 HV1850'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV1850'RECOVERED AS DESCRIBED.
 HV1850
 HV1850                          STATION RECOVERY (2009)
 HV1850
 HV1850'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV1850'RECOVERED IN GOOD CONDITION.
 HV1850
 HV1850                          STATION RECOVERY (2010)
 HV1850
 HV1850'RECOVERY NOTE BY GEOCACHING 2010 (MFM)
 HV1850'RECOVERED IN GOOD CONDITION.
 HV1850
 HV1850                          STATION RECOVERY (2012)
 HV1850
 HV1850'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1850'RECOVERED AS DESCRIBED.
 HV1850
 HV1850                          STATION RECOVERY (2018)
 HV1850
 HV1850'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV1850'RECOVERED IN GOOD CONDITION.
 HV1850
 HV1850                          STATION RECOVERY (2021)
 HV1850
 HV1850'RECOVERY NOTE BY US POWER SQUADRON 2021 (CAC)
 HV1850'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4405 ***********************************************************************
 HV4405  DESIGNATION -  WARDMAN
 HV4405  PID         -  HV4405
 HV4405  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4405  COUNTRY     -  US
 HV4405  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4405
 HV4405                         *CURRENT SURVEY CONTROL
 HV4405  ______________________________________________________________________
 HV4405* NAD 83(1993) POSITION- 38 55 28.64662(N) 077 03 18.41397(W)   ADJUSTED
 HV4405  ______________________________________________________________________
 HV4405  GEOID HEIGHT    -        -32.002 (meters)                     GEOID18
 HV4405  LAPLACE CORR    -         -2.66  (seconds)                    DEFLEC18
 HV4405  HORZ ORDER      -  THIRD
 HV4405
 HV4405.The horizontal coordinates were established by classical geodetic methods
 HV4405.and adjusted by the National Geodetic Survey in November 1994.
 HV4405
 HV4405.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4405.GEOID18 height accuracy estimate available here.
 HV4405
 HV4405.Click photographs - Photos may exist for this station.
 HV4405
 HV4405.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4405
 HV4405. The following values were computed from the NAD 83(1993) position.
 HV4405
 HV4405;                    North         East     Units Scale Factor Converg.
 HV4405;SPC MD       -   139,640.218   395,220.763   MT  0.99995021   -0 02 04.5
 HV4405;SPC MD       -   458,136.28  1,296,653.45   sFT  0.99995021   -0 02 04.5
 HV4405;SPC VA N     - 2,140,619.637 3,625,288.039   MT  0.99996272   +0 54 06.4
 HV4405;SPC VA N     - 7,023,016.26 11,893,965.84   sFT  0.99996272   +0 54 06.4
 HV4405;UTM  18      - 4,310,420.003   321,847.204   MT  0.99999083   -1 17 29.6
 HV4405
 HV4405_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2184710420(NAD 83)
 HV4405
 HV4405                          SUPERSEDED SURVEY CONTROL
 HV4405
 HV4405  NAD 83(1991)-  38 55 28.64574(N)    077 03 18.41518(W) AD(       ) 3
 HV4405  NAD 83(1986)-  38 55 28.64537(N)    077 03 18.42548(W) AD(       ) 3
 HV4405  NAD 27      -  38 55 28.24700(N)    077 03 19.50200(W) AD(       ) 3
 HV4405
 HV4405.Superseded values are not recommended for survey control.
 HV4405
 HV4405.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4405.See file dsdata.pdf to determine how the superseded data were derived.
 HV4405
 HV4405
 HV4405  HISTORY     - Date     Condition        Report By
 HV4405  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4405  HISTORY     - 1959     GOOD             CGS
 HV4405  HISTORY     - 20090319 GOOD             GEOCAC
 HV4405
 HV4405                          STATION DESCRIPTION
 HV4405
 HV4405'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4405'THE CENTER OF THE COPPER DOWNSPOUT ON THE NORTHERN FACE AND
 HV4405'NEAR THE NORTHWEST CORNER OF THE TALLEST ELEVATOR PENTHOUSE
 HV4405'NEAR THE CENTER OF THE WARDMAN PARK HOTEL, CONNECTICUT AVENUE
 HV4405'AND WOODLEY ROAD, N.W.
 HV4405'
 HV4405'JUST BENEATH THE GUTTER ON THE ROOF OF THE PENTHOUSE, THE
 HV4405'WEST EDGE OF THE DOWNSPOUT IS 0.320 METERS FROM THE NORTHWEST
 HV4405'CORNER OF THE PENTHOUSE AND AT THE LEVEL OF THE PARAPET OF
 HV4405'THE HOTEL ROOF THE DISTANCE IS 0.285 METERS.
 HV4405'
 HV4405'DIRECTIONS WERE TAKEN TO THE DOWNSPOUT NEAR THE ROOF OF THE
 HV4405'PENTHOUSE.
 HV4405
 HV4405                          STATION RECOVERY (1959)
 HV4405
 HV4405'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (JKR)
 HV4405'THE STATION WAS RECOVERED IN GOOD CONDITION.  THE HOTEL IS
 HV4405'NOW THE PARK SHERATON HOTEL.  THE DISTANCE FROM THE NORTHWEST
 HV4405'CORNER OF THE PENTHOUSE, AT THE LEVEL OF THE PARAPET OF THE
 HV4405'HOTEL ROOF, TO THE DOWNSPOUT WAS REMEASURED, AND A DISTANCE OF
 HV4405'0.285 METERS WAS OBTAINED TO THE CENTER OF THE DOWNSPOUT,
 HV4405'NOT THE WEST EDGE AS STATED IN THE ORIGINAL DESCRIPTION.
 HV4405'THERE WAS NO EVIDENCE THAT THE DOWNSPOUT HAD BEEN MOVED.
 HV4405
 HV4405                          STATION RECOVERY (2009)
 HV4405
 HV4405'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV4405'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2175 ***********************************************************************
 HV2175  DESIGNATION -  WASH BASE USE 1956
 HV2175  PID         -  HV2175
 HV2175  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2175  COUNTRY     -  US
 HV2175  USGS QUAD   -  WASHINGTON WEST (2016)
 HV2175
 HV2175                         *CURRENT SURVEY CONTROL
 HV2175  ______________________________________________________________________
 HV2175* NAD 83(1993) POSITION- 38 54 13.92341(N) 077 04 08.50233(W)   ADJUSTED
 HV2175* NAVD 88 ORTHO HEIGHT -    23.624 (meters)       77.51  (feet) ADJUSTED
 HV2175  ______________________________________________________________________
 HV2175  GEOID HEIGHT    -        -32.018 (meters)                     GEOID18
 HV2175  LAPLACE CORR    -         -2.83  (seconds)                    DEFLEC18
 HV2175  DYNAMIC HEIGHT  -         23.611 (meters)       77.46  (feet) COMP
 HV2175  MODELED GRAVITY -    980,092.3   (mgal)                       NAVD 88
 HV2175
 HV2175  HORZ ORDER      -  SECOND
 HV2175  VERT ORDER      -  SECOND    CLASS 0
 HV2175
 HV2175.The horizontal coordinates were established by classical geodetic methods
 HV2175.and adjusted by the National Geodetic Survey in November 1994.
 HV2175
 HV2175.The orthometric height was determined by differential leveling and
 HV2175.adjusted by the NATIONAL GEODETIC SURVEY
 HV2175.in June 1991.
 HV2175
 HV2175.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2175.GEOID18 height accuracy estimate available here.
 HV2175
 HV2175.Click photographs - Photos may exist for this station.
 HV2175
 HV2175.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV2175
 HV2175.The dynamic height is computed by dividing the NAVD 88
 HV2175.geopotential number by the normal gravity value computed on the
 HV2175.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2175.degrees latitude (g = 980.6199 gals.).
 HV2175
 HV2175.The modeled gravity was interpolated from observed gravity values.
 HV2175
 HV2175. The following values were computed from the NAD 83(1993) position.
 HV2175
 HV2175;                    North         East     Units Scale Factor Converg.
 HV2175;SPC MD       -   137,336.901   394,012.533   MT  0.99994997   -0 02 36.0
 HV2175;SPC MD       -   450,579.48  1,292,689.45   sFT  0.99994997   -0 02 36.0
 HV2175;SPC VA N     - 2,138,296.855 3,624,117.598   MT  0.99996084   +0 53 35.1
 HV2175;SPC VA N     - 7,015,395.60 11,890,125.82   sFT  0.99996084   +0 53 35.1
 HV2175;UTM  18      - 4,308,143.639   320,588.694   MT  0.99999637   -1 17 59.0
 HV2175
 HV2175!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV2175!SPC MD       -   1.00000132  x   0.99994997  =   0.99995129
 HV2175!SPC VA N     -   1.00000132  x   0.99996084  =   0.99996216
 HV2175!UTM  18      -   1.00000132  x   0.99999637  =   0.99999769
 HV2175
 HV2175:                Primary Azimuth Mark                     Grid Az
 HV2175:SPC MD       -  NW 111 DCDHT                             111 42 06.5
 HV2175:SPC VA N     -  NW 111 DCDHT                             110 45 55.4
 HV2175:UTM  18      -  NW 111 DCDHT                             112 57 29.5
 HV2175
 HV2175_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2058808143(NAD 83)
 HV2175
 HV2175|---------------------------------------------------------------------|
 HV2175| PID    Reference Object                     Distance      Geod. Az  |
 HV2175|                                                           dddmmss.s |
 HV2175| HV2164 NW 111 DCDHT                        477.496 METERS 1113930.5 |
 HV2175| HV4101 N W 110 A 1960                      230.161 METERS 30709     |
 HV2175|---------------------------------------------------------------------|
 HV2175
 HV2175                          SUPERSEDED SURVEY CONTROL
 HV2175
 HV2175  NAD 83(1991)-  38 54 13.92217(N)    077 04 08.50389(W) AD(       ) 2
 HV2175  NAD 83(1986)-  38 54 13.92175(N)    077 04 08.51393(W) AD(       ) 2
 HV2175  NAD 27      -  38 54 13.51940(N)    077 04 09.59030(W) AD(       ) 2
 HV2175  NGVD 29              23.86   (m)           78.3    (f) LEVELING    3  
 HV2175  NGVD 29 (11/26/84)   23.855  (m)           78.26   (f) ADJUSTED    2 0
 HV2175
 HV2175.Superseded values are not recommended for survey control.
 HV2175
 HV2175.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2175.See file dsdata.pdf to determine how the superseded data were derived.
 HV2175
 HV2175_MARKER: DD = SURVEY DISK
 HV2175_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2175_SP_SET: SIDEWALK
 HV2175_STAMPING: WASH BASE 1956
 HV2175_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2175
 HV2175  HISTORY     - Date     Condition        Report By
 HV2175  HISTORY     - 1956     MONUMENTED       USACE
 HV2175  HISTORY     - 1959     SEE DESCRIPTION  CGS
 HV2175  HISTORY     - 1960     GOOD             MADHOP
 HV2175  HISTORY     - 1971     GOOD             NGS
 HV2175  HISTORY     - 1976     GOOD             NGS
 HV2175  HISTORY     - 19950607 MARK NOT FOUND   USPSQD
 HV2175  HISTORY     - 19950818 MARK NOT FOUND   USPSQD
 HV2175  HISTORY     - 20170308 MARK NOT FOUND   NPS
 HV2175
 HV2175                          STATION DESCRIPTION
 HV2175
 HV2175'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1956
 HV2175'STATION IS LOCATED AT NORTHEAST END OF KEY BRIDGE, SET FLUSH IN
 HV2175'SIDEWALK, 2.67 FEET E OF OUTER FACE OF EAST CURB, AND 8.45 FEET S
 HV2175'OF THE NORTH END OF A ALUMINUM GUARD RAIL AT THE SOUTH SIDE OF
 HV2175'ENTRANCE TO FREEWAY.  THE MARK IS A CORPS OF ENGINEERS BRONZE DISC
 HV2175'STAMPED WASH BASE 1956.
 HV2175
 HV2175                          STATION RECOVERY (1959)
 HV2175
 HV2175'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (HAK)
 HV2175'STATION HAS BEEN RESET DUE TO BRIDGE RECONSTRUCTION.  STATION SITE
 HV2175'IS ON KEY BRIDGE.  STATION IS A STANDARD BRASS U.S.E. DISC SET IN
 HV2175'THE SIDEWALK ON THE DOWNSTREAM SIDE OF THE BRIDGE JUST SOUTH OF THE
 HV2175'TURNOFF TO THE GEORGETOWN FREEWAY EASTBOUND, 24.75 FEET NORTH OF A
 HV2175'LAMPPOST BASE, 2.57 FEET SOUTHEAST OF THE DOWNSTREAM CURB AND ON
 HV2175'THE OPPOSITE SIDE OF THE BRIDGE FROM WASH BASE 1 1956.
 HV2175
 HV2175                          STATION RECOVERY (1960)
 HV2175
 HV2175'RECOVERY NOTE BY MADDOX AND HOPKINS SURVEYORS 1960
 HV2175'AT WASHINGTON.
 HV2175'STATION IS LOCATED AT NORTHEAST END OF KEY BRIDGE, SET FLUSH
 HV2175'IN SIDEWALK, 2.67 FEET E OF OUTER FACE OF EAST CURB, AND 8.45
 HV2175'FEET S OF THE NORTH END OF A ALUMINUM GUARD RAIL AT THE
 HV2175'SOUTH SIDE OF ENTRANCE TO FREEWAY.  THE MARK IS A CORPS OF
 HV2175'ENGINEERS BRONZE DISC STAMPED WASH BASE 1956.
 HV2175
 HV2175                          STATION RECOVERY (1971)
 HV2175
 HV2175'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV2175'STATION MARK WAS RECOVERED IN GOOD CONDITION AS DESCRIBED IN 1959,
 HV2175'AT SOUTH SIDE OF THE OFF-RAMP TO THE GEORGETOWN FREEWAY.  ORIGINAL
 HV2175'DESCRIPTION IS ADEQUATE.
 HV2175'
 HV2175'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV2175'IN DISTRICT OF COLUMBIA.
 HV2175
 HV2175                          STATION RECOVERY (1976)
 HV2175
 HV2175'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1976 (CLN)
 HV2175'NO OTHER OBJECTS VG.
 HV2175'
 HV2175'THE STATION MARK AND WASH BASE NO 1 WERE RECOVERED AND FOUND IN GOOD
 HV2175'CONDITION.  THE STATION MARK WAS IN DANGER OF BEING DESTROYED BY A
 HV2175'BIKE PATH AND THERE IS NO SUITABLE PLACE TO MOVE IT TO.  SEVERAL
 HV2175'REFERENCE POINTS WERE SET ON 3-26-76 AND ALL POINTS MEASURED AND
 HV2175'INTERSECTED.  ON 10-13-76 THE SITE WAS VISITED AGAIN AND THE
 HV2175'CONSTRUCTION WAS COMPLETED.  THE POSITION OF THE STATION WAS
 HV2175'RE-ESTABLISHED AND A NEW STATION MARK SET IN THE SAME LOCATION
 HV2175'AS THE FORMER DISK.  THE DISTANCE AND DIRECTION TO ALL POINTS
 HV2175'WERE WITHIN CLOSE AGREEMENT WITH THE PREVIOUS OBSERVATION.  A NEW
 HV2175'REFERENCE MARK TWO WAS SET AT THE LAST DATE.
 HV2175'
 HV2175'A COMPLETE NEW DESCRIPTION FOLLOWS.
 HV2175'
 HV2175'THE STATION IS LOCATED IN THE SOUTHWEST PART OF THE DISTRICT OF
 HV2175'COLUMBIA, ABOUT 100 YARDS WEST OF CANAL ROAD, AND ON THE SOUTHEAST
 HV2175'SIDE OF THE KEY BRIDGE.  IT IS JUST SOUTHWEST OF AN EXIT RAMP
 HV2175'LEADING DOWN TO HIGHWAY 29 AND IN THE SLOPE OF A NEWLY BUILT BIKE
 HV2175'RAMP.
 HV2175'
 HV2175'THERE IS NO TO REACH REQUIRED FOR THIS STATION.  THE LOCATION IS
 HV2175'ADEQUATE TO FIND IT WITH.
 HV2175'
 HV2175'THE STATION MARK IS A STANDARD DISK STAMPED WASHINGTON BASE USE 1956
 HV2175'1976 SET IN A DRILL HOLE IN THE SOUTHEAST SIDEWALK OF THE KEY
 HV2175'BRIDGE.  IT IS 37 FEET SOUTHEAST OF THE CENTER OF THE ROAD WHICH
 HV2175'CROSSES THE KEY BRIDGE, 25.6 FEET NORTHEAST OF THE THIRD LIGHT
 HV2175'POLE, FROM THE NORTHEAST CORNER OF THE BRIDGE, 23 FEET SOUTHWEST
 HV2175'OF AN EXIT RAMP, 2.2 FEET NORTHWEST OF THE SOUTHEAST RAIL OF THE
 HV2175'BRIDGE, AND 1.5 FEET SOUTHEAST OF THE SOUTHEAST EDGE OF THE
 HV2175'ROAD.
 HV2175'
 HV2175'REFERENCE MARK ONE IS AN ARMY CORPS OF ENGINEERS DISK STAMPED WASH
 HV2175'BASE 1 1956 CEMENTED IN A DRILL HOLE IN THE SOUTHEAST SIDEWALK OF
 HV2175'THE BRIDGE.  IT IS 51 FEET NORTHEAST OF A LIGHT POLE, 36 FEET
 HV2175'NORTHWEST OF THE CENTER LINE OF THE ROAD ON THE BRIDGE, 2.8 FEET
 HV2175'SOUTHEAST OF THE NORTHWEST RAIL OF THE BRIDGE, AND 2.5 FEET
 HV2175'NORTHWEST OF THE GUARDRAIL ON THE NORTHWEST SIDE OF THE ROAD.
 HV2175'
 HV2175'REFERENCE MARK TWO IS A STANDARD DISK STAMPED WASHINGTON BASE USE
 HV2175'1956 NO 2 1976 CEMENTED IN A DRILL HOLE IN THE SOUTHEAST SIDEWALK OF
 HV2175'THE NORTHEAST PART OF THE KEY BRIDGE.  IT IS 43 FEET SOUTHWEST OF
 HV2175'THE CENTER OF THE EXIT RAMP, 35 FEET SOUTHEAST OF THE CENTER LINE
 HV2175'OF THE ROAD.  REFERENCE MARK TWO IS ALSO 5.4 FEET EAST OF A LIGHT
 HV2175'POLE, 4.6 FEET NORTHWEST OF THE SOUTHEAST RAIL OF THE BRIDGE,
 HV2175'AND 1 FOOT SOUTHEAST OF THE GUARD RAIL ALONG THE SOUTHEAST SIDE
 HV2175'OF THE ROAD.
 HV2175'
 HV2175'THERE IS NO SUITABLE PLACE TO SET AN AZIMUTH MARK AT THIS STATION.
 HV2175'THE WASHINGTON MONUMENT MAY BE USED AS AN AZIMUTH.
 HV2175'
 HV2175'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN SOUTHWEST
 HV2175'PART OF DIST. OF COLUMBIA.
 HV2175
 HV2175                          STATION RECOVERY (1995)
 HV2175
 HV2175'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV2175'MARK NOT FOUND.
 HV2175
 HV2175                          STATION RECOVERY (1995)
 HV2175
 HV2175'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV2175'MARK NOT FOUND.
 HV2175
 HV2175                          STATION RECOVERY (2017)
 HV2175
 HV2175'RECOVERY NOTE BY NATIONAL PARK SERVICE 2017 (JCR)
 HV2175'MARK WAS NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4457 ***********************************************************************
 HV4457  DESIGNATION -  WASHINGTON BASE 1 USE 1932
 HV4457  PID         -  HV4457
 HV4457  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4457  COUNTRY     -  US
 HV4457  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4457
 HV4457                         *CURRENT SURVEY CONTROL
 HV4457  ______________________________________________________________________
 HV4457* NAD 83(1993) POSITION- 38 54 14.15203(N) 077 04 09.29912(W)   ADJUSTED
 HV4457* NAVD 88 ORTHO HEIGHT -    24.    (meters)       79.    (feet) SCALED
 HV4457  ______________________________________________________________________
 HV4457  GEOID HEIGHT    -        -32.018 (meters)                     GEOID18
 HV4457  LAPLACE CORR    -         -2.83  (seconds)                    DEFLEC18
 HV4457  HORZ ORDER      -  THIRD
 HV4457
 HV4457.The horizontal coordinates were established by classical geodetic methods
 HV4457.and adjusted by the National Geodetic Survey in November 1994.
 HV4457
 HV4457.The orthometric height was scaled from a topographic map.
 HV4457
 HV4457.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4457.GEOID18 height accuracy estimate available here.
 HV4457
 HV4457.Click photographs - Photos may exist for this station.
 HV4457
 HV4457.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4457
 HV4457. The following values were computed from the NAD 83(1993) position.
 HV4457
 HV4457;                    North         East     Units Scale Factor Converg.
 HV4457;SPC MD       -   137,343.966   393,993.340   MT  0.99994997   -0 02 36.5
 HV4457;SPC MD       -   450,602.66  1,292,626.48   sFT  0.99994997   -0 02 36.5
 HV4457;SPC VA N     - 2,138,303.605 3,624,098.293   MT  0.99996085   +0 53 34.6
 HV4457;SPC VA N     - 7,015,417.74 11,890,062.48   sFT  0.99996085   +0 53 34.6
 HV4457;UTM  18      - 4,308,151.123   320,569.660   MT  0.99999646   -1 17 59.5
 HV4457
 HV4457!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4457!SPC MD       -   1.00000129  x   0.99994997  =   0.99995126
 HV4457!SPC VA N     -   1.00000129  x   0.99996085  =   0.99996214
 HV4457!UTM  18      -   1.00000129  x   0.99999646  =   0.99999775
 HV4457
 HV4457:                Primary Azimuth Mark                     Grid Az
 HV4457:SPC MD       -  CRAMPTON                                 279 05 33.8
 HV4457:SPC VA N     -  CRAMPTON                                 278 09 22.7
 HV4457:UTM  18      -  CRAMPTON                                 280 20 56.8
 HV4457
 HV4457_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2056908151(NAD 83)
 HV4457
 HV4457|---------------------------------------------------------------------|
 HV4457| PID    Reference Object                     Distance      Geod. Az  |
 HV4457|                                                           dddmmss.s |
 HV4457| HV4458 WASHINGTON BASE USE 1932             18.301 METERS 10949     |
 HV4457| HV4452 VIRGINIA BASE 1 USE 1932            281.444 METERS 19957     |
 HV4457| HV4197 CRAMPTON                            APPROX. 0.6 KM 2790257.3 |
 HV4457|---------------------------------------------------------------------|
 HV4457
 HV4457                          SUPERSEDED SURVEY CONTROL
 HV4457
 HV4457  NAD 83(1991)-  38 54 14.15079(N)    077 04 09.30069(W) AD(       ) 3
 HV4457  NAD 83(1986)-  38 54 14.15042(N)    077 04 09.31101(W) AD(       ) 3
 HV4457  NAD 27      -  38 54 13.75100(N)    077 04 10.38300(W) AD(       ) 3
 HV4457
 HV4457.Superseded values are not recommended for survey control.
 HV4457
 HV4457.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4457.See file dsdata.pdf to determine how the superseded data were derived.
 HV4457
 HV4457
 HV4457  HISTORY     - Date     Condition        Report By
 HV4457  HISTORY     - 1932     MONUMENTED       CGS
 HV4457  HISTORY     - 1946     GOOD             CGS
 HV4457  HISTORY     - 1957     MARK NOT FOUND   CGS
 HV4457  HISTORY     - 19950818 MARK NOT FOUND   USPSQD
 HV4457
 HV4457                          STATION DESCRIPTION
 HV4457
 HV4457'DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4457'STATION SITE IS ON THE KEY BRIDGE CROSSING THE POTOMAC RIVER
 HV4457'AT A SECTION OF THE DISTRICT OF COLUMBIA KNOWN AS GEORGETOWN.
 HV4457'THE STATION IS A 1/4-INCH BRASS TUBE LEADED IN A 3/4-INCH
 HV4457'DRILL HOLE IN THE UPSTREAM SIDEWALK OF THE BRIDGE, 0.1
 HV4457'FOOT OFFSHORE FROM THE CENTER LINE OF THE SECOND PIER OUT FROM
 HV4457'THE BRIDGE ABUTMENT ON THE DISTRICT OF COLUMBIA SHORE, 5.2 FEET
 HV4457'DOWNSTREAM FROM THE UPSTREAM RAIL, 4.97 FEET UPSTREAM FROM
 HV4457'THE UPSTREAM CURB, AND ON THE OPPOSITE SIDE OF THE BRIDGE
 HV4457'FROM WASH BASE.
 HV4457
 HV4457                          STATION RECOVERY (1957)
 HV4457
 HV4457'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1957 (ROW)
 HV4457'VIRGINIA BASE
 HV4457'
 HV4457'VIRGINIA BASE 1
 HV4457'
 HV4457'BRIDGE 1924
 HV4457'
 HV4457'WASHINGTON BASE
 HV4457'
 HV4457'WASHINGTON BASE 1
 HV4457'
 HV4457'STATION DESTROYED.  THE ENTIRE SURFACE OF THE BRIDGE WAS
 HV4457'REBUILT DURING THE WINTER OF 1956-57.  A THIRD TRAFFIC LANE
 HV4457'WAS ADDED IN BOTH DIRECTIONS IN PLACE OF THE OLD SIDEWALKS.
 HV4457'NEW SIDEWALKS WERE PLACED BY EXTENDING THE WIDTH OF THE BRIDGE
 HV4457'ON BOTH SIDES APPARENTLY BY CANTILEVER BRACING.
 HV4457'
 HV4457'REPLACEMENT STATIONS WERE ESTABLISHED AND OBSERVATIONS TYING
 HV4457'THEM IN WERE MADE BY THE U.S.G.B. AFTER THE BRIDGE WAS COMPLETED.
 HV4457
 HV4457                          STATION RECOVERY (1995)
 HV4457
 HV4457'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4457'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4451 ***********************************************************************
 HV4451  DESIGNATION -  WASHINGTON BASE NO 1 USE 1956
 HV4451  PID         -  HV4451
 HV4451  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4451  COUNTRY     -  US
 HV4451  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4451
 HV4451                         *CURRENT SURVEY CONTROL
 HV4451  ______________________________________________________________________
 HV4451* NAD 83(1993) POSITION- 38 54 14.17114(N) 077 04 09.37699(W)   ADJUSTED
 HV4451* NAVD 88 ORTHO HEIGHT -    24.    (meters)       79.    (feet) SCALED
 HV4451  ______________________________________________________________________
 HV4451  GEOID HEIGHT    -        -32.018 (meters)                     GEOID18
 HV4451  LAPLACE CORR    -         -2.83  (seconds)                    DEFLEC18
 HV4451  HORZ ORDER      -  THIRD
 HV4451
 HV4451.The horizontal coordinates were established by classical geodetic methods
 HV4451.and adjusted by the National Geodetic Survey in November 1994.
 HV4451
 HV4451.The orthometric height was scaled from a topographic map.
 HV4451
 HV4451.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4451.GEOID18 height accuracy estimate available here.
 HV4451
 HV4451.Click photographs - Photos may exist for this station.
 HV4451
 HV4451.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4451
 HV4451. The following values were computed from the NAD 83(1993) position.
 HV4451
 HV4451;                    North         East     Units Scale Factor Converg.
 HV4451;SPC MD       -   137,344.556   393,991.464   MT  0.99994997   -0 02 36.5
 HV4451;SPC MD       -   450,604.60  1,292,620.33   sFT  0.99994997   -0 02 36.5
 HV4451;SPC VA N     - 2,138,304.165 3,624,096.408   MT  0.99996085   +0 53 34.6
 HV4451;SPC VA N     - 7,015,419.58 11,890,056.30   sFT  0.99996085   +0 53 34.6
 HV4451;UTM  18      - 4,308,151.754   320,567.798   MT  0.99999647   -1 17 59.6
 HV4451
 HV4451!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4451!SPC MD       -   1.00000129  x   0.99994997  =   0.99995126
 HV4451!SPC VA N     -   1.00000129  x   0.99996085  =   0.99996214
 HV4451!UTM  18      -   1.00000129  x   0.99999647  =   0.99999776
 HV4451
 HV4451:                Primary Azimuth Mark                     Grid Az
 HV4451:SPC MD       -  CRAMPTON                                 279 04 02.1
 HV4451:SPC VA N     -  CRAMPTON                                 278 07 51.0
 HV4451:UTM  18      -  CRAMPTON                                 280 19 25.2
 HV4451
 HV4451_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2056708151(NAD 83)
 HV4451
 HV4451|---------------------------------------------------------------------|
 HV4451| PID    Reference Object                     Distance      Geod. Az  |
 HV4451|                                                           dddmmss.s |
 HV4451| HV2175 WASH BASE USE 1956                   22.417 METERS 10955     |
 HV4451| HV4449 VIRGINIA BASE USE 1956              281.720 METERS 19525     |
 HV4451| HV4447 VIRGINIA BASE NO 1 USE 1956         280.860 METERS 19954     |
 HV4451| HV4197 CRAMPTON                            APPROX. 0.6 KM 2790125.6 |
 HV4451|---------------------------------------------------------------------|
 HV4451
 HV4451                          SUPERSEDED SURVEY CONTROL
 HV4451
 HV4451  NAD 83(1991)-  38 54 14.16990(N)    077 04 09.37856(W) AD(       ) 3
 HV4451  NAD 83(1986)-  38 54 14.16948(N)    077 04 09.38858(W) AD(       ) 3
 HV4451  NAD 27      -  38 54 13.77000(N)    077 04 10.46000(W) AD(       ) 3
 HV4451
 HV4451.Superseded values are not recommended for survey control.
 HV4451
 HV4451.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4451.See file dsdata.pdf to determine how the superseded data were derived.
 HV4451
 HV4451_MARKER: DD = SURVEY DISK
 HV4451_SETTING: 0 = UNSPECIFIED SETTING
 HV4451_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4451
 HV4451  HISTORY     - Date     Condition        Report By
 HV4451  HISTORY     - 1956     MONUMENTED       USACE
 HV4451  HISTORY     - 1959     GOOD             CGS
 HV4451  HISTORY     - 19950607 MARK NOT FOUND   USPSQD
 HV4451  HISTORY     - 19950818 MARK NOT FOUND   USPSQD
 HV4451
 HV4451                          STATION DESCRIPTION
 HV4451
 HV4451'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1956
 HV4451'STATION IS LOCATED AT NORTHEAST END OF KEY BRIDGE, SET FLUSH
 HV4451'IN SIDEWLK, 3.40 FEET W OF OUTER FACE OF WEST CURB, 50.44
 HV4451'FEET N OF NORTH FACE OF LIGHT POST 7, AND 285.47 FEET S
 HV4451'OF NORTH END OF ALUMINUM GUARD RAIL ON UPPER SIDE OF BRIDGE
 HV4451'NEAR THE D.C. END.  THE MARK IS A CORPS OF ENGINEERS BRONZE
 HV4451'DISC STAMPED WASH BASE NO 1 1956.
 HV4451
 HV4451                          STATION RECOVERY (1959)
 HV4451
 HV4451'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (HAK)
 HV4451'STATION HAS BEEN RESET DUE TO BRIDGE RECONSTRUCTION.  STATION
 HV4451'SITE IS ON KEY BRIDGE.  STATION IS A STANDARD BRASS U.S.E.
 HV4451'DISC SET IN THE SIDEWALK ON THE UPSTREAM SIDE OF THE BRIDGE
 HV4451'ACROSS THE TURNOFF TO THE GEORGETOWN FREEWAY TURNOFF EASTBOUND,
 HV4451'50.40 FEET NORTH OF LAMBERT BASE, 9.00 FEET WEST OF CENTER OF
 HV4451'MANHOLE COVER, 3.40 FEET WEST OF EDGE OF UPSTREAM CURB AND ON
 HV4451'THE OPPOSITE SIDE OF THE BRIDGE FROM WASH BASE 1956.
 HV4451
 HV4451                          STATION RECOVERY (1995)
 HV4451
 HV4451'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4451'MARK NOT FOUND.
 HV4451
 HV4451                          STATION RECOVERY (1995)
 HV4451
 HV4451'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4451'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4458 ***********************************************************************
 HV4458  DESIGNATION -  WASHINGTON BASE USE 1932
 HV4458  PID         -  HV4458
 HV4458  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4458  COUNTRY     -  US
 HV4458  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4458
 HV4458                         *CURRENT SURVEY CONTROL
 HV4458  ______________________________________________________________________
 HV4458* NAD 83(1993) POSITION- 38 54 13.95077(N) 077 04 08.58459(W)   ADJUSTED
 HV4458* NAVD 88 ORTHO HEIGHT -    24.    (meters)       79.    (feet) SCALED
 HV4458  ______________________________________________________________________
 HV4458  GEOID HEIGHT    -        -32.018 (meters)                     GEOID18
 HV4458  LAPLACE CORR    -         -2.83  (seconds)                    DEFLEC18
 HV4458  HORZ ORDER      -  THIRD
 HV4458
 HV4458.The horizontal coordinates were established by classical geodetic methods
 HV4458.and adjusted by the National Geodetic Survey in November 1994.
 HV4458
 HV4458.The orthometric height was scaled from a topographic map.
 HV4458
 HV4458.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4458.GEOID18 height accuracy estimate available here.
 HV4458
 HV4458.Click photographs - Photos may exist for this station.
 HV4458
 HV4458.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4458
 HV4458. The following values were computed from the NAD 83(1993) position.
 HV4458
 HV4458;                    North         East     Units Scale Factor Converg.
 HV4458;SPC MD       -   137,337.747   394,010.552   MT  0.99994997   -0 02 36.0
 HV4458;SPC MD       -   450,582.26  1,292,682.95   sFT  0.99994997   -0 02 36.0
 HV4458;SPC VA N     - 2,138,297.668 3,624,115.604   MT  0.99996084   +0 53 35.1
 HV4458;SPC VA N     - 7,015,398.27 11,890,119.28   sFT  0.99996084   +0 53 35.1
 HV4458;UTM  18      - 4,308,144.528   320,586.732   MT  0.99999638   -1 17 59.1
 HV4458
 HV4458!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4458!SPC MD       -   1.00000129  x   0.99994997  =   0.99995126
 HV4458!SPC VA N     -   1.00000129  x   0.99996084  =   0.99996213
 HV4458!UTM  18      -   1.00000129  x   0.99999638  =   0.99999767
 HV4458
 HV4458_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2058608144(NAD 83)
 HV4458
 HV4458|---------------------------------------------------------------------|
 HV4458| PID    Reference Object                     Distance      Geod. Az  |
 HV4458|                                                           dddmmss.s |
 HV4458| HV1698 BOUNDARY WITNESS MK 5 DC VA         385.117 METERS 18150     |
 HV4458| HV4448 VIRGINIA BASE USE 1932              281.480 METERS 19958     |
 HV4458|---------------------------------------------------------------------|
 HV4458
 HV4458                          SUPERSEDED SURVEY CONTROL
 HV4458
 HV4458  NAD 83(1991)-  38 54 13.94953(N)    077 04 08.58616(W) AD(       ) 3
 HV4458  NAD 83(1986)-  38 54 13.94909(N)    077 04 08.59620(W) AD(       ) 3
 HV4458  NAD 27      -  38 54 13.55000(N)    077 04 09.66900(W) AD(       ) 3
 HV4458
 HV4458.Superseded values are not recommended for survey control.
 HV4458
 HV4458.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4458.See file dsdata.pdf to determine how the superseded data were derived.
 HV4458
 HV4458
 HV4458  HISTORY     - Date     Condition        Report By
 HV4458  HISTORY     - 1932     MONUMENTED       CGS
 HV4458  HISTORY     - 1946     GOOD             CGS
 HV4458  HISTORY     - 1946     GOOD             CGS
 HV4458  HISTORY     - 1957     MARK NOT FOUND   CGS
 HV4458  HISTORY     - 19950607 MARK NOT FOUND   USPSQD
 HV4458  HISTORY     - 19950818 MARK NOT FOUND   USPSQD
 HV4458
 HV4458                          STATION DESCRIPTION
 HV4458
 HV4458'DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (JMN)
 HV4458'STATION SITE IS ON THE KEY BRIDGE ACROSS THE POTOMAC RIVER
 HV4458'IN A SECTION KNOWN AS GEORGETOWN, DISTRICT OF COLUMBIA.
 HV4458'STATION IS A 1/4-INCH BRASS TUBE LEADED IN A 3/4-INCH DRILL
 HV4458'HOLE IN THE SIDEWALK ON THE DOWNSTREAM SIDE OF THE BRIDGE,
 HV4458'0.15 FOOT N OF THE CENTER LINE OF THE SECOND PIER OUT FROM THE
 HV4458'ABUTMENT AT THE D.C. END OF THE BRIDGE, 5.22 FEET UPSTREAM
 HV4458'FROM DOWNSTREAM GUARDRAIL, 4.96 FEET DOWNSTREAM FROM DOWNSTREAM
 HV4458'CURB, AND ON THE OPPOSITE SIDE OF THE BRIDGE FROM WASH
 HV4458'BASE 1.
 HV4458
 HV4458                          STATION RECOVERY (1946)
 HV4458
 HV4458'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (CRR)
 HV4458'STATION WAS RECOVERED AS DESCRIBED.  NO OLD DIRECTIONS OR
 HV4458'DISTANCES WERE TAKEN AT THIS TIME.  A COMPLETE NEW DESCRIPTION
 HV4458'FOLLOWS--THE STATION IS LOCATED ON THE WASHINGTON END OF THE
 HV4458'KEY BRIDGE DIRECTLY OVER THE FIRST WASHINGTON PIER.  IT IS
 HV4458'ON THE DOWNSTREAM SIDE OF THE BRIDGE, 5.2 FEET FROM THE RAIL,
 HV4458'4.97 FEET FROM THE CURB, AND 0.1 FOOT N OF THE CENTER LINE
 HV4458'OF THE FIRST WASHINGTON PIER.  THE MARK IS A 1/4 INCH BRASS ROD
 HV4458'LEADED IN A 3/4-INCH DRILL HOLE IN THE CONCRETE SIDEWALK.
 HV4458
 HV4458                          STATION RECOVERY (1957)
 HV4458
 HV4458'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1957 (ROW)
 HV4458'VIRGINIA BASE
 HV4458'
 HV4458'VIRGINIA BASE 1
 HV4458'
 HV4458'BRIDGE 1924
 HV4458'
 HV4458'WASHINGTON BASE
 HV4458'
 HV4458'WASHINGTON BASE 1
 HV4458'
 HV4458'STATION DESTROYED.  THE ENTIRE SURFACE OF THE BRIDGE WAS
 HV4458'REBUILT DURING THE WINTER OF 1956-57.  A THIRD TRAFFIC LANE
 HV4458'WAS ADDED IN BOTH DIRECTIONS IN PLACE OF THE OLD SIDEWALKS.
 HV4458'NEW SIDEWALKS WERE PLACED BY EXTENDING THE WIDTH OF THE BRIDGE
 HV4458'ON BOTH SIDES APPARENTLY BY CANTILEVER BRACING.
 HV4458'
 HV4458'REPLACEMENT STATIONS WERE ESTABLISHED AND OBSERVATIONS TYING
 HV4458'THEM IN WERE MADE BY THE U.S.G.B. AFTER THE BRIDGE WAS COMPLETED.
 HV4458
 HV4458                          STATION RECOVERY (1995)
 HV4458
 HV4458'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4458'MARK NOT FOUND.
 HV4458
 HV4458                          STATION RECOVERY (1995)
 HV4458
 HV4458'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4458'MARK NOT FOUND.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DE5965 ***********************************************************************
 DE5965  DESIGNATION -  WASHINGTON C
 DE5965  PID         -  DE5965
 DE5965  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DE5965  COUNTRY     -  US
 DE5965  USGS QUAD   -  WASHINGTON WEST (2016)
 DE5965
 DE5965                         *CURRENT SURVEY CONTROL
 DE5965  ______________________________________________________________________
 DE5965* NAD 83(1986) POSITION- 38 53 35.6    (N) 077 01 56.1    (W)   HD_HELD2
 DE5965* NAVD 88 ORTHO HEIGHT -     3.110 (meters)       10.20  (feet) ADJUSTED
 DE5965  ______________________________________________________________________
 DE5965  GEOID HEIGHT    -        -32.085 (meters)                     GEOID18
 DE5965  DYNAMIC HEIGHT  -          3.109 (meters)       10.20  (feet) COMP
 DE5965  MODELED GRAVITY -    980,098.5   (mgal)                       NAVD 88
 DE5965
 DE5965  VERT ORDER      -  FIRST     CLASS II
 DE5965
 DE5965.The horizontal coordinates were established by autonomous hand held GPS
 DE5965.observations and have an estimated accuracy of +/- 10 meters.
 DE5965
 DE5965.The orthometric height was determined by differential leveling and
 DE5965.adjusted by the NATIONAL GEODETIC SURVEY
 DE5965.in October 2012.
 DE5965
 DE5965.No vertical observational check was made to the station.
 DE5965
 DE5965.Significant digits in the geoid height do not necessarily reflect accuracy.
 DE5965.GEOID18 height accuracy estimate available here.
 DE5965
 DE5965.Click photographs - Photos may exist for this station.
 DE5965
 DE5965.The dynamic height is computed by dividing the NAVD 88
 DE5965.geopotential number by the normal gravity value computed on the
 DE5965.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 DE5965.degrees latitude (g = 980.6199 gals.).
 DE5965
 DE5965.The modeled gravity was interpolated from observed gravity values.
 DE5965
 DE5965
 DE5965_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2375106890(NAD 83)
 DE5965
 DE5965                          SUPERSEDED SURVEY CONTROL
 DE5965
 DE5965.No superseded survey control is available for this station.
 DE5965
 DE5965_MARKER: DG = GRAVITY STATION DISK
 DE5965_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 DE5965_SP_SET: STONE CURB
 DE5965_STAMPING: WASHINGTON GRAVITY METER 1950
 DE5965_MARK LOGO: CGS
 DE5965_MAGNETIC: N = NO MAGNETIC MATERIAL
 DE5965_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DE5965+STABILITY: SURFACE MOTION
 DE5965_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 DE5965+SATELLITE: SATELLITE OBSERVATIONS - March 01, 2012
 DE5965
 DE5965  HISTORY     - Date     Condition        Report By
 DE5965  HISTORY     - 1950     MONUMENTED       CGS
 DE5965  HISTORY     - 19900120 GOOD             NGS
 DE5965  HISTORY     - 20120222 GOOD             NGS
 DE5965  HISTORY     - 20120301 GOOD             NGS
 DE5965
 DE5965                          STATION DESCRIPTION
 DE5965
 DE5965'DESCRIBED BY NATIONAL GEODETIC SURVEY 1990
 DE5965'OTHER ALIASES INCLUDE IGB 11687C, U 337 A, NHO 01.02, NN 79, WHOI 552,
 DE5965'WASHINGTON 14TH ST AND ACIC 0103-2. THE STATION IS IN WASHINGTON DC,
 DE5965'ON CONSTITUTION AVENUE BETWEEN 14TH AND 15TH STREETS, AT THE COMMERCE
 DE5965'BUILDING, ABOUT 25 M (82.0 FT) WEST OF A STRIP OF BRICK ON THE WEST
 DE5965'SIDE OF 14TH STREET, ON THE SOUTH CURB OF THE NORTHERNMOST OF THREE
 DE5965'DRIVEWAYS TO THE SOUTH PARKING AREA OF THE DEPARTMENT, AT THE EAST
 DE5965'SIDE OF THE GATE, 0.1 M (0.3 FT) NORTH OF THE CONCRETE COLUMN.
 DE5965'STATION IS MONUMENTED WITH A USCGS BRASS GRAVITY DISK INSCRIBED
 DE5965'(COMMERCE GRAVITY METER 1950) .  ESTABLISHED BY GRS OF CGS IN 1950.
 DE5965'RECOVERY BY D W OF NGS ON 1/20/1990.
 DE5965
 DE5965                          STATION RECOVERY (2012)
 DE5965
 DE5965'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DE5965'MARK IS ON 14TH ST, APPROXIMATELY 385 FT NORTH OF THE NORTH CURB OF
 DE5965'CONSTITUTION AVE. AND ON THE SOUTH SIDE OF THE MOST NORTHLY ARCHED
 DE5965'ENTRANCE INTO THE PARKING AREA FOR THE DEPARTMENT OF COMMERCE
 DE5965'BUILDING.
 DE5965
 DE5965                          STATION RECOVERY (2012)
 DE5965
 DE5965'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 DE5965'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4488 ***********************************************************************
 HV4488  DESIGNATION -  WASHINGTON IMM CON SHRINE TWR
 HV4488  PID         -  HV4488
 HV4488  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4488  COUNTRY     -  US
 HV4488  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4488
 HV4488                         *CURRENT SURVEY CONTROL
 HV4488  ______________________________________________________________________
 HV4488* NAD 83(1993) POSITION- 38 55 58.12585(N) 077 00 03.13546(W)   ADJUSTED
 HV4488  ______________________________________________________________________
 HV4488  GEOID HEIGHT    -        -32.057 (meters)                     GEOID18
 HV4488  LAPLACE CORR    -         -3.32  (seconds)                    DEFLEC18
 HV4488  HORZ ORDER      -  THIRD
 HV4488
 HV4488.The horizontal coordinates were established by classical geodetic methods
 HV4488.and adjusted by the National Geodetic Survey in November 1994.
 HV4488
 HV4488.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4488.GEOID18 height accuracy estimate available here.
 HV4488
 HV4488.Click photographs - Photos may exist for this station.
 HV4488
 HV4488.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4488
 HV4488. The following values were computed from the NAD 83(1993) position.
 HV4488
 HV4488;                    North         East     Units Scale Factor Converg.
 HV4488;SPC MD       -   140,547.789   399,924.484   MT  0.99995034   -0 00 02.0
 HV4488;SPC MD       -   461,113.87  1,312,085.58   sFT  0.99995034   -0 00 02.0
 HV4488;SPC VA N     - 2,141,603.960 3,629,976.362   MT  0.99996349   +0 56 08.3
 HV4488;SPC VA N     - 7,026,245.66 11,909,347.45   sFT  0.99996349   +0 56 08.3
 HV4488;UTM  18      - 4,311,224.190   326,569.846   MT  0.99997038   -1 15 27.6
 HV4488
 HV4488_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2656911224(NAD 83)
 HV4488
 HV4488                          SUPERSEDED SURVEY CONTROL
 HV4488
 HV4488  NAD 83(1991)-  38 55 58.12508(N)    077 00 03.13604(W) AD(       ) 3
 HV4488  NAD 83(1986)-  38 55 58.12444(N)    077 00 03.14723(W) AD(       ) 3
 HV4488  NAD 27      -  38 55 57.72402(N)    077 00 04.23122(W) AD(       ) 3
 HV4488
 HV4488.Superseded values are not recommended for survey control.
 HV4488
 HV4488.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4488.See file dsdata.pdf to determine how the superseded data were derived.
 HV4488
 HV4488_MARKER: 55 = TOWER
 HV4488_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4488+SATELLITE: SATELLITE OBSERVATIONS - March 19, 2009
 HV4488
 HV4488  HISTORY     - Date     Condition        Report By
 HV4488  HISTORY     - 1970     FIRST OBSERVED   NGS
 HV4488  HISTORY     - 19950623 GOOD             USPSQD
 HV4488  HISTORY     - 20090319 GOOD             GEOCAC
 HV4488
 HV4488                          STATION DESCRIPTION
 HV4488
 HV4488'NO DESCRIPTIVE TEXT AVAILABLE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4442 ***********************************************************************
 HV4442  DESIGNATION -  WASHINGTON MONUMENT
 HV4442  PID         -  HV4442
 HV4442  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4442  COUNTRY     -  US
 HV4442  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4442
 HV4442                         *CURRENT SURVEY CONTROL
 HV4442  ______________________________________________________________________
 HV4442* NAD 83(2011) POSITION- 38 53 22.08257(N) 077 02 06.86428(W)   ADJUSTED
 HV4442* NAD 83(2011) ELLIP HT-   149.172 (meters)        (02/01/15)   ADJUSTED
 HV4442* NAD 83(2011) EPOCH   -  2010.00
 HV4442* NAVD 88 ORTHO HEIGHT -   181.3   (meters)      595.    (feet) VERT ANG
 HV4442  ______________________________________________________________________
 HV4442  GEOID HEIGHT    -        -32.088 (meters)                     GEOID18
 HV4442  NAD 83(2011) X  -  1,115,287.503 (meters)                     COMP
 HV4442  NAD 83(2011) Y  - -4,844,432.918 (meters)                     COMP
 HV4442  NAD 83(2011) Z  -  3,982,867.096 (meters)                     COMP
 HV4442  LAPLACE CORR    -         -2.52  (seconds)                    DEFLEC18
 HV4442
 HV4442  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV4442  Standards:
 HV4442         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV4442            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV4442  -------------------------------------------------------------------
 HV4442  NETWORK    0.37   0.20           0.16   0.14   0.10      0.18214230
 HV4442  -------------------------------------------------------------------
 HV4442  Click here for local accuracies and other accuracy information.
 HV4442
 HV4442.The horizontal coordinates were established by classical geodetic methods
 HV4442.and adjusted by the National Geodetic Survey in February 2015.
 HV4442
 HV4442.The orthometric height was determined by vertical angle observations.
 HV4442
 HV4442.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4442.GEOID18 height accuracy estimate available here.
 HV4442
 HV4442.Click photographs - Photos may exist for this station.
 HV4442
 HV4442.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV4442
 HV4442.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4442
 HV4442.The ellipsoidal height was determined by classical geodetic methods
 HV4442.and is referenced to NAD 83.
 HV4442
 HV4442. The following values were computed from the NAD 83(2011) position.
 HV4442
 HV4442;                    North         East     Units Scale Factor Converg.
 HV4442;SPC MD       -   135,736.687   396,942.688   MT  0.99994988   -0 01 19.6
 HV4442;SPC MD       -   445,329.45  1,302,302.80   sFT  0.99994988   -0 01 19.6
 HV4442;SPC VA N     - 2,136,744.723 3,627,073.543   MT  0.99995962   +0 54 51.1
 HV4442;SPC VA N     - 7,010,303.31 11,899,823.78   sFT  0.99995962   +0 54 51.1
 HV4442;UTM  18      - 4,306,479.506   323,483.180   MT  0.99998369   -1 16 41.1
 HV4442
 HV4442!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4442!SPC MD       -   0.99997660  x   0.99994988  =   0.99992648
 HV4442!SPC VA N     -   0.99997660  x   0.99995962  =   0.99993622
 HV4442!UTM  18      -   0.99997660  x   0.99998369  =   0.99996029
 HV4442
 HV4442:                Primary Azimuth Mark                     Grid Az
 HV4442:SPC MD       -  RENO RESET                               332 15 59.9
 HV4442:SPC VA N     -  RENO RESET                               331 19 49.2
 HV4442:UTM  18      -  RENO RESET                               333 31 21.4
 HV4442
 HV4442_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2348306479(NAD 83)
 HV4442
 HV4442|---------------------------------------------------------------------|
 HV4442| PID    Reference Object                     Distance      Geod. Az  |
 HV4442|                                                           dddmmss.s |
 HV4442| HV4233 CHRISTIAN CHURCH SPIRE              APPROX. 1.9 KM 0072836.9 |
 HV4442| HV4243 COMMERCE                            396.854 METERS 03220     |
 HV4442| HV4166 MC KINLEY HIGH SCHOOL FINIAL        APPROX. 3.9 KM 0432846.8 |
 HV4442| HV4164 B AND O ROUNDHOUSE STACK            APPROX. 2.9 KM 0622759.1 |
 HV4442| HV4165 LIBRARY CONGRESS DOME FINIAL        APPROX. 2.7 KM 0915243.6 |
 HV4442| HV4358 ST DOMINIC CHURCH SPIRE             APPROX. 1.5 KM 1183541.2 |
 HV4442| HV4681 ST ELIZABETHS ASYLUM AIR BCN        APPROX. 4.9 KM 1413411.7 |
 HV4442| HV4664 BUZZARD PT PLANT PEPCO STACK        APPROX. 3.4 KM 1425856.9 |
 HV4442| HV1841 A                                    45.246 METERS 17958     |
 HV4442| AI4422 W M SOUTH                           485.812 METERS 1935904.3 |
 HV4442| HV1845 M 17                                242.074 METERS 23732     |
 HV4442| AI4421 W M WEST                            363.448 METERS 26200     |
 HV4442| UA0024 JEFFERSON PIER                      119.221 METERS 28816     |
 HV4442| HV4301 HEURICHS BREWERY FINIAL             APPROX. 1.7 KM 2890057.1 |
 HV4442| HV4384 RENO RESET                          APPROX. 7.9 KM 3321440.3 |
 HV4442| AH7372 868 H 90002                         387.127 METERS 34255     |
 HV4442| HV4437 ST MATTHEWS CH CROSS ON DOME        APPROX. 1.9 KM 3465447.6 |
 HV4442| HV1846 MERIDIAN STONE                      APPROX. 0.5 KM 3470917.7 |
 HV4442|---------------------------------------------------------------------|
 HV4442
 HV4442                          SUPERSEDED SURVEY CONTROL
 HV4442
 HV4442  NAD 83(2011)-  38 53 22.08241(N)    077 02 06.86507(W) AD(2010.00) 0
 HV4442  ELLIP H (06/27/12)  149.151  (m)                       GP(2010.00)    
 HV4442  NAD 83(2007)-  38 53 22.08269(N)    077 02 06.86575(W) AD(2002.00) 0
 HV4442  ELLIP H (02/10/07)  149.172  (m)                       GP(2002.00)    
 HV4442  NAD 83(1993)-  38 53 22.08258(N)    077 02 06.86520(W) AD(       ) 1
 HV4442  ELLIP H (10/28/02)  149.201  (m)                       GP(       ) 5 2
 HV4442  NAD 83(1993)-  38 53 22.08377(N)    077 02 06.86378(W) AD(       ) 1
 HV4442  NAD 83(1991)-  38 53 22.08253(N)    077 02 06.86514(W) AD(       ) 1
 HV4442  NAD 83(1986)-  38 53 22.08215(N)    077 02 06.87581(W) AD(       ) 1
 HV4442  NAD 27      -  38 53 21.68140(N)    077 02 07.95500(W) AD(       ) 1
 HV4442  USSD        -  38 53 22.01200(N)    077 02 07.78200(W) AD(       ) 3
 HV4442  NAVD 88 (10/28/02)  181.3    (m)  GEOID99  model used  GPS OBS        
 HV4442
 HV4442.Superseded values are not recommended for survey control.
 HV4442
 HV4442.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4442.See file dsdata.pdf to determine how the superseded data were derived.
 HV4442
 HV4442_MARKER: 70 = MONUMENT
 HV4442_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4442+SATELLITE: SATELLITE OBSERVATIONS - January 21, 2011
 HV4442
 HV4442  HISTORY     - Date     Condition        Report By
 HV4442  HISTORY     - 1913     FIRST OBSERVED   CGS
 HV4442  HISTORY     - 1927     GOOD             CGS
 HV4442  HISTORY     - 1928     GOOD             CGS
 HV4442  HISTORY     - 1934     GOOD             CGS
 HV4442  HISTORY     - 1946     GOOD             CGS
 HV4442  HISTORY     - 1959     GOOD             CGS
 HV4442  HISTORY     - 1961     GOOD             CGS
 HV4442  HISTORY     - 1965     GOOD             CGS
 HV4442  HISTORY     - 1976     GOOD             NGS
 HV4442  HISTORY     - 1979     GOOD             NGS
 HV4442  HISTORY     - 1979     GOOD             NGS
 HV4442  HISTORY     - 1983     GOOD             NGS
 HV4442  HISTORY     - 19950619 GOOD             USPSQD
 HV4442  HISTORY     - 20020818 GOOD             GEOCAC
 HV4442  HISTORY     - 20050718 GOOD             USPSQD
 HV4442  HISTORY     - 20070331 GOOD             GEOCAC
 HV4442  HISTORY     - 20090319 GOOD             GEOCAC
 HV4442  HISTORY     - 20100418 GOOD             GEOCAC
 HV4442  HISTORY     - 20101127 GOOD             INDIV
 HV4442  HISTORY     - 20110121 GOOD             GEOCAC
 HV4442  HISTORY     - 20120301 GOOD             NGS
 HV4442  HISTORY     - 20131025 SEE DESCRIPTION  NGS
 HV4442
 HV4442                          STATION DESCRIPTION
 HV4442
 HV4442'DESCRIBED BY COAST AND GEODETIC SURVEY 1913 (OBF)
 HV4442'STATION IS CENTER OF TIP OF WASHINGTON MONUMENT.
 HV4442
 HV4442                          STATION RECOVERY (1927)
 HV4442
 HV4442'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1927 (BW)
 HV4442'STATION WAS RECOVERED.
 HV4442
 HV4442                          STATION RECOVERY (1928)
 HV4442
 HV4442'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1928 (EOH)
 HV4442'THIS STATION IS CENTER OF THE TIP OF THE WASHINGTON MONUMENT.
 HV4442
 HV4442                          STATION RECOVERY (1934)
 HV4442
 HV4442'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1934 (JB)
 HV4442'THE STATION IS THE APEX OF THE WASHINGTON MONUMENT, AND IS MARKED
 HV4442'BY THE CENTER OF THE ALUMINUM TIP THAT SURMOUNTS THE MONUMENT.  THIS
 HV4442'TIP HAS APPARENTLY BEEN BURNED BY LIGHTNING, AS THE TOP IS ABOUT
 HV4442'1/2 INCH SQUARE.
 HV4442'
 HV4442'THE STATION WAS OCCUPIED DURING THE COURSE OF WASHING AND
 HV4442'REPAIRING THE MONUMENT, AND THE SCAFFOLDING ERECTED FOR THAT
 HV4442'PURPOSE WAS USED TO REACH THE TOP.
 HV4442'
 HV4442'NO REFERENCES ARE NECESSARY.
 HV4442
 HV4442                          STATION RECOVERY (1946)
 HV4442
 HV4442'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (RCB)
 HV4442'THE STATION WAS RECOVERED AS DESCRIBED, BUT WAS NOT OCCUPIED.  A
 HV4442'COMPLETE NEW DESCRIPTION FOLLOWS--THE POINT OBSERVED UPON WAS
 HV4442'THE APEX OF THE ALUMINUM CAP AT THE TOP OF THE MONUMENT.
 HV4442
 HV4442                          STATION RECOVERY (1959)
 HV4442
 HV4442'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (JKR)
 HV4442'THIS INTERSECTION STATION WAS RECOVERED AS DESCRIBED.
 HV4442
 HV4442                          STATION RECOVERY (1961)
 HV4442
 HV4442'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1961 (JPP)
 HV4442'THIS STATION RECOVERED AS DESCRIBED AND WAS FOUND TO BE IN GOOD
 HV4442'CONDITION.
 HV4442
 HV4442                          STATION RECOVERY (1965)
 HV4442
 HV4442'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1965 (DCW)
 HV4442'STATION RECOVERED AS DESCRIBED.
 HV4442
 HV4442                          STATION RECOVERY (1976)
 HV4442
 HV4442'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1976 (AMS)
 HV4442'STATION RECOVERED AS DESCRIBED AND IN GREAT CONDITION.
 HV4442'
 HV4442'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV4442'IN D.C.
 HV4442
 HV4442                          STATION RECOVERY (1979)
 HV4442
 HV4442'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 (BMP)
 HV4442'THE STATION WAS OBSERVED APPARENTLY AS PREVIOUSLY DESCRIBED.
 HV4442
 HV4442                          STATION RECOVERY (1979)
 HV4442
 HV4442'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979 (MWJ)
 HV4442'STATION RECOVERED AS DESCRIBED.
 HV4442
 HV4442                          STATION RECOVERY (1983)
 HV4442
 HV4442'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1983 (DAH)
 HV4442'RECOVERED AS DESCRIBED, STILL IN GREAT CONDITION.
 HV4442'
 HV4442'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--IN WASHINGTON.
 HV4442
 HV4442                          STATION RECOVERY (1995)
 HV4442
 HV4442'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4442'RECOVERED IN GOOD CONDITION.
 HV4442
 HV4442                          STATION RECOVERY (2002)
 HV4442
 HV4442'RECOVERY NOTE BY GEOCACHING 2002 (APC)
 HV4442'RECOVERED IN GOOD CONDITION.
 HV4442
 HV4442                          STATION RECOVERY (2005)
 HV4442
 HV4442'RECOVERY NOTE BY US POWER SQUADRON 2005 (FM)
 HV4442'RECOVERED IN GOOD CONDITION.
 HV4442
 HV4442                          STATION RECOVERY (2007)
 HV4442
 HV4442'RECOVERY NOTE BY GEOCACHING 2007 (RLM)
 HV4442'RECOVERED IN GOOD CONDITION.
 HV4442
 HV4442                          STATION RECOVERY (2009)
 HV4442
 HV4442'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV4442'RECOVERED IN GOOD CONDITION.
 HV4442
 HV4442                          STATION RECOVERY (2010)
 HV4442
 HV4442'RECOVERY NOTE BY GEOCACHING 2010 (GAH)
 HV4442'OBSERVED FROM VARIOUS LOCATIONS AROUND MONUMENT ON THE GROUND.
 HV4442
 HV4442                          STATION RECOVERY (2010)
 HV4442
 HV4442'RECOVERY NOTE BY INDIVIDUAL CONTRIBUTORS 2010 (MPB)
 HV4442'RECOVERED IN GOOD CONDITION. WASHINGTON MONUMENT IS THE MOST VISIBLE
 HV4442'NGS MONUMENT IN THE ENTIRE DISTRICT.
 HV4442
 HV4442                          STATION RECOVERY (2011)
 HV4442
 HV4442'RECOVERY NOTE BY GEOCACHING 2011 (KMM)
 HV4442'RECOVERED IN GOOD CONDITION.
 HV4442
 HV4442                          STATION RECOVERY (2012)
 HV4442
 HV4442'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV4442'RECOVERED AS DESCRIBED.
 HV4442
 HV4442                          STATION RECOVERY (2013)
 HV4442
 HV4442'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2013 (DAS)
 HV4442'RECOVERED IN GOOD CONDITION.
 HV4442'
 HV4442'NOTE-THE STATION WAS OCCUPIED DURING THE COURSE OF THE MONUMENT
 HV4442'UNDERGOING REPAIRS FROM THE 2011 EARTHQUAKE.  THE SCAFFOLDING ERECTED
 HV4442'FOR THAT PURPOSE WAS USED   TO REACH THE TOP.  THERE IS A SMALL DIMPLE
 HV4442'IN THE CENTER OF THE PEAK WHICH WAS USED AS THE ACTUAL SURVEY MARK,
 HV4442'BUT WHETHER DUE TO WEATHERING OR MAN-MADE WAS UNCLEAR.  THE SIZE AND
 HV4442'SHAPE OF THE PEAK MATCH THE 1934 DESCRIPTION.  THE LIGHTNING
 HV4442'PROTECTION COLLAR HAS BEEN REMOVED AND REPLACED WITH A NEW SYSTEM THAT
 HV4442'DOES NOT REST DIRECTLY ON THE ALUMINUM PEAK.
 HV4442'
 HV4442'ENGRAVINGS ON EACH SIDE OF THE ALUMINUM PEAK MATCH THEIR ORIGINAL 1884
 HV4442'VERSIONS WITH TWO EXCEPTIONS.  FIRST, MUCH OF THE TEXT HAS BEEN
 HV4442'OBSCURED BECAUSE IT WAS RUBBED OFF BY THE LIGHTNING PROTECTION COLLAR
 HV4442'(NOW REMOVED).  SECOND, THERE WAS NEW TEXT FOUND ON THE EAST FACE
 HV4442'WHICH HAD BEEN ENGRAVED THERE BY THE NATIONAL PARK SERVICE IN 1934 BUT
 HV4442'NOT WIDELY REPORTED (SEE SURVEY REPORT FOR FURTHER DETAILS).  CAREFUL
 HV4442'MEASUREMENTS OF THE SIZE AND SHAPE OF THE PEAK INDICATE THAT THE
 HV4442'DIMPLE ON THE ROUNDED TOP IS APPROXIMATELY 3/8 INCH (10 MM) LOWER THAN
 HV4442'THE ORIGINAL POINTED PEAK AS CAST IN 1884.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV3984 ***********************************************************************
 HV3984  DESIGNATION -  WASHINGTON TV STA WMAL TOWER
 HV3984  PID         -  HV3984
 HV3984  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV3984  COUNTRY     -  US
 HV3984  USGS QUAD   -  WASHINGTON WEST (2016)
 HV3984
 HV3984                         *CURRENT SURVEY CONTROL
 HV3984  ______________________________________________________________________
 HV3984* NAD 83(1993) POSITION- 38 56 10.32579(N) 077 05 31.41562(W)   ADJUSTED
 HV3984  ______________________________________________________________________
 HV3984  GEOID HEIGHT    -        -31.934 (meters)                     GEOID18
 HV3984  LAPLACE CORR    -         -1.97  (seconds)                    DEFLEC18
 HV3984  HORZ ORDER      -  THIRD
 HV3984
 HV3984.The horizontal coordinates were established by classical geodetic methods
 HV3984.and adjusted by the National Geodetic Survey in November 1994.
 HV3984
 HV3984.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV3984.GEOID18 height accuracy estimate available here.
 HV3984
 HV3984.Click photographs - Photos may exist for this station.
 HV3984
 HV3984.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV3984
 HV3984. The following values were computed from the NAD 83(1993) position.
 HV3984
 HV3984;                    North         East     Units Scale Factor Converg.
 HV3984;SPC MD       -   140,928.008   392,018.423   MT  0.99995040   -0 03 28.0
 HV3984;SPC MD       -   462,361.31  1,286,147.11   sFT  0.99995040   -0 03 28.0
 HV3984;SPC VA N     - 2,141,854.934 3,622,065.038   MT  0.99996382   +0 52 43.4
 HV3984;SPC VA N     - 7,027,069.06 11,883,391.71   sFT  0.99996382   +0 52 43.4
 HV3984;UTM  18      - 4,311,777.805   318,673.738   MT  1.00000488   -1 18 54.4
 HV3984
 HV3984_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1867311777(NAD 83)
 HV3984
 HV3984                          SUPERSEDED SURVEY CONTROL
 HV3984
 HV3984  NAD 83(1991)-  38 56 10.32482(N)    077 05 31.41692(W) AD(       ) 3
 HV3984  NAD 83(1986)-  38 56 10.32456(N)    077 05 31.42675(W) AD(       ) 3
 HV3984  NAD 27      -  38 56 09.92545(N)    077 05 32.50010(W) AD(       ) 3
 HV3984
 HV3984.Superseded values are not recommended for survey control.
 HV3984
 HV3984.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV3984.See file dsdata.pdf to determine how the superseded data were derived.
 HV3984
 HV3984_MARKER: 43 = RADIO/TV TOWER
 HV3984
 HV3984  HISTORY     - Date     Condition        Report By
 HV3984  HISTORY     - 1956     FIRST OBSERVED   CGS
 HV3984  HISTORY     - 1959     GOOD             CGS
 HV3984  HISTORY     - 1969     GOOD             CGS
 HV3984  HISTORY     - 1971     GOOD             NGS
 HV3984  HISTORY     - 19950617 GOOD             USPSQD
 HV3984
 HV3984                          STATION DESCRIPTION
 HV3984
 HV3984'DESCRIBED BY COAST AND GEODETIC SURVEY 1956 (MLC)
 HV3984'THE POINT LOCATED WAS THE TOP CENTER OF THE TOWER AT THE W END OF
 HV3984'TRANSMITTER BUILDING ON THE CAMPUS AT AMERICAN UNIVERSITY.
 HV3984'
 HV3984'THE TOWER IS A FOUR-LEGGED STRUCTURE WITH A POLE ON TOP.  THE
 HV3984'OVERALL HEIGHT OF THE TOWER IS 398 FT.  THE FM ANTENNA IS
 HV3984'SUSPENDED AT THE TOP OF THE TOWER STRUCTURE AND NOT AT THE TOP OF
 HV3984'THE POLE.
 HV3984'
 HV3984'THE TOWER IS DISTINCT IN THAT THE WHITE AND ORANGE PAINTED
 HV3984'SECTIONS OF THE TOWER ARE SEPARATED BY A 2-FT. BAND OF BLACK
 HV3984'BETWEEN THEM.
 HV3984'
 HV3984'THIS IS AN INTERSECTION STATION.
 HV3984
 HV3984                          STATION RECOVERY (1959)
 HV3984
 HV3984'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (JKR)
 HV3984'THIS INTERSECTION STATION WAS RECOVERED IN GOOD CONDITION AS
 HV3984'DESCRIBED, WITH THE FOLLOWING EXCEPTION--THE TOWER IS AT THE SW
 HV3984'END OF THE TRANSMITTER BUILDING, NOT THE W END AS STATED IN THE
 HV3984'ORIGINAL DESCRIPTION.
 HV3984
 HV3984                          STATION RECOVERY (1969)
 HV3984
 HV3984'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1969 (JBJ)
 HV3984'THE STATION IS THE RED LIGHT ON TOP OF THE WASHINGTON, DISTRICT
 HV3984'OF COLUMBIA, TELEVISION STATION WMAL MAST.  IT IS ABOUT 398 FEET
 HV3984'ABOVE THE GROUND.
 HV3984'
 HV3984'THE STATION IS LOCATED ON THE CAMPUS OF THE AMERICAN UNIVERSITY.
 HV3984
 HV3984                          STATION RECOVERY (1971)
 HV3984
 HV3984'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV3984'STATION RECOVERED AS DESCRIBED.
 HV3984'
 HV3984'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN
 HV3984'IN DIST. OF COL.
 HV3984
 HV3984                          STATION RECOVERY (1995)
 HV3984
 HV3984'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV3984'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4171 ***********************************************************************
 HV4171  DESIGNATION -  WASHINGTON TV STA WRC TOWER
 HV4171  PID         -  HV4171
 HV4171  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4171  COUNTRY     -  US
 HV4171  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4171
 HV4171                         *CURRENT SURVEY CONTROL
 HV4171  ______________________________________________________________________
 HV4171* NAD 83(1993) POSITION- 38 56 24.24319(N) 077 04 52.50627(W)   ADJUSTED
 HV4171  ______________________________________________________________________
 HV4171  GEOID HEIGHT    -        -31.942 (meters)                     GEOID18
 HV4171  LAPLACE CORR    -         -2.59  (seconds)                    DEFLEC18
 HV4171  HORZ ORDER      -  THIRD
 HV4171
 HV4171.The horizontal coordinates were established by classical geodetic methods
 HV4171.and adjusted by the National Geodetic Survey in November 1994.
 HV4171
 HV4171.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4171.GEOID18 height accuracy estimate available here.
 HV4171
 HV4171.Click photographs - Photos may exist for this station.
 HV4171
 HV4171.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4171
 HV4171. The following values were computed from the NAD 83(1993) position.
 HV4171
 HV4171;                    North         East     Units Scale Factor Converg.
 HV4171;SPC MD       -   141,356.272   392,955.870   MT  0.99995047   -0 03 03.6
 HV4171;SPC MD       -   463,766.37  1,289,222.72   sFT  0.99995047   -0 03 03.6
 HV4171;SPC VA N     - 2,142,298.469 3,622,995.373   MT  0.99996419   +0 53 07.7
 HV4171;SPC VA N     - 7,028,524.23 11,886,443.99   sFT  0.99996419   +0 53 07.7
 HV4171;UTM  18      - 4,312,185.417   319,620.406   MT  1.00000066   -1 18 30.4
 HV4171
 HV4171_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1962012185(NAD 83)
 HV4171
 HV4171                          SUPERSEDED SURVEY CONTROL
 HV4171
 HV4171  NAD 83(1991)-  38 56 24.24210(N)    077 04 52.50742(W) AD(       ) 3
 HV4171  NAD 83(1986)-  38 56 24.24189(N)    077 04 52.51731(W) AD(       ) 3
 HV4171  NAD 27      -  38 56 23.84260(N)    077 04 53.59125(W) AD(       ) 3
 HV4171
 HV4171.Superseded values are not recommended for survey control.
 HV4171
 HV4171.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4171.See file dsdata.pdf to determine how the superseded data were derived.
 HV4171
 HV4171_MARKER: 43 = RADIO/TV TOWER
 HV4171
 HV4171  HISTORY     - Date     Condition        Report By
 HV4171  HISTORY     - 1958     FIRST OBSERVED   CGS
 HV4171  HISTORY     - 1959     GOOD             CGS
 HV4171  HISTORY     - 1969     GOOD             CGS
 HV4171  HISTORY     - 19950601 GOOD             USPSQD
 HV4171
 HV4171                          STATION DESCRIPTION
 HV4171
 HV4171'DESCRIBED BY COAST AND GEODETIC SURVEY 1958 (JCE)
 HV4171'STATION IS LOCATED ON THE NAVAL COMMUNICATIONS ANNEX GROUNDS,
 HV4171'BETWEEN U.S. NAVAL CHAPEL AND THE HILLCREST CHILDRENS HOUSE.
 HV4171'
 HV4171'STATION IS CONSTRUCTION OF STEEL ABOUT 200 FEET HIGH, PAINTED RED
 HV4171'AND WHITE, HAS THREE LEGS WITH 50 FEET ANTENNA ATOP OF MAST.  THE
 HV4171'POINT INTERSECTED WAS THE RED LIGHT A TOP OF ANTENNA.
 HV4171'
 HV4171'TO REACH FROM WARD CIRCLE.  GO NORTHEAST ON NEBRASKA AVENUE FOR
 HV4171'0.25 MILE AND STATION ON RIGHT.
 HV4171
 HV4171                          STATION RECOVERY (1959)
 HV4171
 HV4171'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (JKR)
 HV4171'STATION RECOVERED IN GOOD CONDITION AS DESCRIBED.
 HV4171
 HV4171                          STATION RECOVERY (1969)
 HV4171
 HV4171'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1969 (JBJ)
 HV4171'THE STATION IS THE RED LIGHT MOUNTED ON TOP OF WASHINGTON, DISTRICT
 HV4171'OF COLUMBIA, TELEVISION STATION WRC MAST.  IT IS ABOUT 459 FEET
 HV4171'ABOVE THE GROUND.
 HV4171'
 HV4171'THE STATION IS LOCATED AT 4001 NEBRSKA AVENUE.
 HV4171
 HV4171                          STATION RECOVERY (1995)
 HV4171
 HV4171'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4171'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4186 ***********************************************************************
 HV4186  DESIGNATION -  WASHINGTON TV STA WTOP TOWER
 HV4186  PID         -  HV4186
 HV4186  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4186  COUNTRY     -  US
 HV4186  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4186
 HV4186                         *CURRENT SURVEY CONTROL
 HV4186  ______________________________________________________________________
 HV4186* NAD 83(1993) POSITION- 38 57 00.08061(N) 077 04 45.66596(W)   ADJUSTED
 HV4186  ______________________________________________________________________
 HV4186  GEOID HEIGHT    -        -31.934 (meters)                     GEOID18
 HV4186  LAPLACE CORR    -         -2.64  (seconds)                    DEFLEC18
 HV4186  HORZ ORDER      -  THIRD
 HV4186
 HV4186.The horizontal coordinates were established by classical geodetic methods
 HV4186.and adjusted by the National Geodetic Survey in November 1994.
 HV4186
 HV4186.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4186.GEOID18 height accuracy estimate available here.
 HV4186
 HV4186.Click photographs - Photos may exist for this station.
 HV4186
 HV4186.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4186
 HV4186. The following values were computed from the NAD 83(1993) position.
 HV4186
 HV4186;                    North         East     Units Scale Factor Converg.
 HV4186;SPC MD       -   142,461.203   393,121.558   MT  0.99995068   -0 02 59.3
 HV4186;SPC MD       -   467,391.46  1,289,766.31   sFT  0.99995068   -0 02 59.3
 HV4186;SPC VA N     - 2,143,405.976 3,623,142.983   MT  0.99996519   +0 53 11.9
 HV4186;SPC VA N     - 7,032,157.77 11,886,928.27   sFT  0.99996519   +0 53 11.9
 HV4186;UTM  18      - 4,313,286.500   319,810.314   MT  0.99999982   -1 18 27.1
 HV4186
 HV4186_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1981013286(NAD 83)
 HV4186
 HV4186                          SUPERSEDED SURVEY CONTROL
 HV4186
 HV4186  NAD 83(1991)-  38 57 00.07980(N)    077 04 45.66705(W) AD(       ) 3
 HV4186  NAD 83(1986)-  38 57 00.07953(N)    077 04 45.67706(W) AD(       ) 3
 HV4186  NAD 27      -  38 56 59.68319(N)    077 04 46.75253(W) AD(       ) 3
 HV4186
 HV4186.Superseded values are not recommended for survey control.
 HV4186
 HV4186.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4186.See file dsdata.pdf to determine how the superseded data were derived.
 HV4186
 HV4186_MARKER: 43 = RADIO/TV TOWER
 HV4186_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4186+SATELLITE: SATELLITE OBSERVATIONS - March 15, 2012
 HV4186
 HV4186  HISTORY     - Date     Condition        Report By
 HV4186  HISTORY     - 1956     FIRST OBSERVED   CGS
 HV4186  HISTORY     - 1969     GOOD             CGS
 HV4186  HISTORY     - 19950601 GOOD             USPSQD
 HV4186  HISTORY     - 20120315 GOOD             GEOCAC
 HV4186
 HV4186                          STATION DESCRIPTION
 HV4186
 HV4186'DESCRIBED BY COAST AND GEODETIC SURVEY 1956 (MLC)
 HV4186'THE POINT LOCATED WAS THE TOP CENTER OF THE TOWER WHICH IS
 HV4186'373 FT. ABOVE THE GROUND.
 HV4186'
 HV4186'THE STATION IS LOCATED AT FORTY-FIRST STREET, AT BRANDYWINE,
 HV4186'NEAR THE NW BOUNDARY OF THE DISTRICT OF COLUMBIA.
 HV4186'
 HV4186'THIS IS AN INTERSECTION STATION.
 HV4186
 HV4186                          STATION RECOVERY (1969)
 HV4186
 HV4186'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1969 (JBJ)
 HV4186'THE STATION IS THE CENTER OF THE TOP OF THE LIGHT ON TOP OF THE
 HV4186'MAST OF THE WASHINGTON, DISTRICT OF COLUMBIA TELEVISION STATION
 HV4186'WTOP.  THE MAST IS ON A FOUR LEGGED SELF-SUPPORTED TOWER THAT IS
 HV4186'373 FEET ABOVE THE GROUND AND THE MAST IS 157 FEET ABOVE THE
 HV4186'TOWER.  THE STATION IS ABOUT 530 FEET ABOVE THE GROUND
 HV4186'SURFACE.
 HV4186'
 HV4186'THE STATION IS LOCATED AT THE CORNER OF NORTH-WEST 40TH STREET
 HV4186'AND NORTH-WEST BRANDYWINE STREET IN THE DISTRICT OF COLUMBIA.
 HV4186
 HV4186                          STATION RECOVERY (1995)
 HV4186
 HV4186'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4186'RECOVERED IN GOOD CONDITION.
 HV4186
 HV4186                          STATION RECOVERY (2012)
 HV4186
 HV4186'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV4186'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4481 ***********************************************************************
 HV4481  DESIGNATION -  WASHINGTON TV STA WTTG TOWER
 HV4481  PID         -  HV4481
 HV4481  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4481  COUNTRY     -  US
 HV4481  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4481
 HV4481                         *CURRENT SURVEY CONTROL
 HV4481  ______________________________________________________________________
 HV4481* NAD 83(1993) POSITION- 38 57 22.48282(N) 077 04 57.45582(W)   ADJUSTED
 HV4481  ______________________________________________________________________
 HV4481  GEOID HEIGHT    -        -31.923 (meters)                     GEOID18
 HV4481  LAPLACE CORR    -         -2.50  (seconds)                    DEFLEC18
 HV4481  HORZ ORDER      -  THIRD
 HV4481
 HV4481.The horizontal coordinates were established by classical geodetic methods
 HV4481.and adjusted by the National Geodetic Survey in November 1994.
 HV4481
 HV4481.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4481.GEOID18 height accuracy estimate available here.
 HV4481
 HV4481.Click photographs - Photos may exist for this station.
 HV4481
 HV4481.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4481
 HV4481. The following values were computed from the NAD 83(1993) position.
 HV4481
 HV4481;                    North         East     Units Scale Factor Converg.
 HV4481;SPC MD       -   143,152.246   392,838.300   MT  0.99995083   -0 03 06.7
 HV4481;SPC MD       -   469,658.66  1,288,836.99   sFT  0.99995083   -0 03 06.7
 HV4481;SPC VA N     - 2,144,092.307 3,622,848.464   MT  0.99996582   +0 53 04.6
 HV4481;SPC VA N     - 7,034,409.51 11,885,962.00   sFT  0.99996582   +0 53 04.6
 HV4481;UTM  18      - 4,313,983.629   319,542.280   MT  1.00000101   -1 18 35.1
 HV4481
 HV4481_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1954213983(NAD 83)
 HV4481
 HV4481                          SUPERSEDED SURVEY CONTROL
 HV4481
 HV4481  NAD 83(1991)-  38 57 22.48206(N)    077 04 57.45686(W) AD(       ) 3
 HV4481  NAD 83(1986)-  38 57 22.48164(N)    077 04 57.46647(W) AD(       ) 3
 HV4481  NAD 27      -  38 57 22.08395(N)    077 04 58.54198(W) AD(       ) 3
 HV4481
 HV4481.Superseded values are not recommended for survey control.
 HV4481
 HV4481.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4481.See file dsdata.pdf to determine how the superseded data were derived.
 HV4481
 HV4481_MARKER: 42 = RADIO/TV MAST
 HV4481_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4481+SATELLITE: SATELLITE OBSERVATIONS - March 15, 2012
 HV4481
 HV4481  HISTORY     - Date     Condition        Report By
 HV4481  HISTORY     - 1969     FIRST OBSERVED   CGS
 HV4481  HISTORY     - 19950601 GOOD             USPSQD
 HV4481  HISTORY     - 20100429 GOOD             GEOCAC
 HV4481  HISTORY     - 20120315 GOOD             GEOCAC
 HV4481
 HV4481                          STATION DESCRIPTION
 HV4481
 HV4481'DESCRIBED BY COAST AND GEODETIC SURVEY 1969 (JBJ)
 HV4481'THE STATION IS THE RED LIGHT MOUNTED ON TOP OF THE WASHINGTON,
 HV4481'DISTRICT OF COLUMBIA, TELEVISION STATION WTTG MAST.  IT IS ABOUT
 HV4481'770 FEET ABOVE THE GROUND.
 HV4481'
 HV4481'THE STATION IS LOCATED AT 5151 WISCONSIN AVENUE.
 HV4481
 HV4481                          STATION RECOVERY (1995)
 HV4481
 HV4481'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4481'RECOVERED IN GOOD CONDITION.
 HV4481
 HV4481                          STATION RECOVERY (2010)
 HV4481
 HV4481'RECOVERY NOTE BY GEOCACHING 2010 (JA)
 HV4481'RECOVERED IN GOOD CONDITION.
 HV4481
 HV4481                          STATION RECOVERY (2012)
 HV4481
 HV4481'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV4481'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DR5001 ***********************************************************************
 DR5001  HT_MOD      -  This is a Height Modernization Survey Station.
 DR5001  DESIGNATION -  WDC6 IGS ARP
 DR5001  PID         -  DR5001
 DR5001  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DR5001  COUNTRY     -  US
 DR5001  USGS QUAD   -  WASHINGTON WEST (2016)
 DR5001
 DR5001                         *CURRENT SURVEY CONTROL
 DR5001  ______________________________________________________________________
 DR5001* NAD 83(2011) POSITION- 38 55 14.00161(N) 077 03 58.72341(W)   ADJUSTED
 DR5001* NAD 83(2011) ELLIP HT-    60.264 (meters)        (04/16/20)   ADJUSTED
 DR5001* NAD 83(2011) EPOCH   -  2010.00
 DR5001* NAVD 88 ORTHO HEIGHT -    92.29  (meters)      302.8   (feet) GPS OBS
 DR5001  ______________________________________________________________________
 DR5001  GEOID HEIGHT    -        -31.991 (meters)                     GEOID18
 DR5001  NAD 83(2011) X  -  1,112,159.532 (meters)                     COMP
 DR5001  NAD 83(2011) Y  - -4,842,857.059 (meters)                     COMP
 DR5001  NAD 83(2011) Z  -  3,985,497.035 (meters)                     COMP
 DR5001  LAPLACE CORR    -         -2.96  (seconds)                    DEFLEC18
 DR5001
 DR5001  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 DR5001  Standards:
 DR5001         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 DR5001            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 DR5001  -------------------------------------------------------------------
 DR5001  NETWORK    0.22   0.80           0.09   0.09   0.41      0.00108186
 DR5001  -------------------------------------------------------------------
 DR5001  Click here for local accuracies and other accuracy information.
 DR5001
 DR5001.The horizontal coordinates were established by GPS observations
 DR5001.and adjusted by the JMT ENGINEERING in April 2020.
 DR5001
 DR5001.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 DR5001.been affixed to the stable North American tectonic plate. See 
 DR5001.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 DR5001
 DR5001.The horizontal coordinates are valid at the epoch date displayed above
 DR5001.which is a decimal equivalence of Year/Month/Day.
 DR5001
 DR5001.The orthometric height was determined by GPS observations and a
 DR5001.high-resolution geoid model using precise GPS observation and
 DR5001.processing techniques.
 DR5001
 DR5001.Significant digits in the geoid height do not necessarily reflect accuracy.
 DR5001.GEOID18 height accuracy estimate available here.
 DR5001
 DR5001.Click photographs - Photos may exist for this station.
 DR5001
 DR5001.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 DR5001
 DR5001.The Laplace correction was computed from DEFLEC18 derived deflections.
 DR5001
 DR5001.The ellipsoidal height was determined by GPS observations
 DR5001.and is referenced to NAD 83.
 DR5001
 DR5001. The following values were computed from the NAD 83(2011) position.
 DR5001
 DR5001;                    North         East     Units Scale Factor Converg.
 DR5001;UTM  18      - 4,309,990.455   320,866.235   MT  0.99999515   -1 17 54.6
 DR5001
 DR5001!             -  Elev Factor  x  Scale Factor =   Combined Factor
 DR5001!UTM  18      -   0.99999054  x   0.99999515  =   0.99998569
 DR5001
 DR5001_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2086609990(NAD 83)
 DR5001
 DR5001                          SUPERSEDED SURVEY CONTROL
 DR5001
 DR5001.No superseded survey control is available for this station.
 DR5001
 DR5001_MARKER: Z = SEE DESCRIPTION
 DR5001_SETTING: 0 = UNSPECIFIED SETTING
 DR5001_MAGNETIC: O = OTHER; SEE DESCRIPTION
 DR5001_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 DR5001+STABILITY: POSITION/ELEVATION WELL
 DR5001_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 DR5001+SATELLITE: SATELLITE OBSERVATIONS - August 28, 2015
 DR5001
 DR5001  HISTORY     - Date     Condition        Report By
 DR5001  HISTORY     - 20150828 MONUMENTED       NONE
 DR5001
 DR5001                          STATION DESCRIPTION
 DR5001
 DR5001'DESCRIBED BY NATIONAL GEODETIC SURVEY 2015
 DR5001'WDC6 IGS ARP IS A CONTINUOUSLY OPERATING REFERENCE STATION LOCATED IN
 DR5001'WASHINGTON, D.C.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4685 ***********************************************************************
 HV4685  DESIGNATION -  WEST RAD TWR BLDG NR BELLEVUE
 HV4685  PID         -  HV4685
 HV4685  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4685  COUNTRY     -  US
 HV4685  USGS QUAD   -  ALEXANDRIA (2019)
 HV4685
 HV4685                         *CURRENT SURVEY CONTROL
 HV4685  ______________________________________________________________________
 HV4685* NAD 83(1993) POSITION- 38 49 20.78707(N) 077 01 34.30014(W)   ADJUSTED
 HV4685  ______________________________________________________________________
 HV4685  GEOID HEIGHT    -        -32.216 (meters)                     GEOID18
 HV4685  LAPLACE CORR    -         -2.90  (seconds)                    DEFLEC18
 HV4685  HORZ ORDER      -  THIRD
 HV4685
 HV4685.The horizontal coordinates were established by classical geodetic methods
 HV4685.and adjusted by the National Geodetic Survey in November 1994.
 HV4685
 HV4685.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4685.GEOID18 height accuracy estimate available here.
 HV4685
 HV4685.Click photographs - Photos may exist for this station.
 HV4685
 HV4685.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4685
 HV4685. The following values were computed from the NAD 83(1993) position.
 HV4685
 HV4685;                    North         East     Units Scale Factor Converg.
 HV4685;SPC MD       -   128,295.998   397,725.319   MT  0.99995028   -0 00 59.2
 HV4685;SPC MD       -   420,917.79  1,304,870.48   sFT  0.99995028   -0 00 59.2
 HV4685;SPC VA N     - 2,129,317.763 3,627,977.661   MT  0.99995476   +0 55 11.4
 HV4685;SPC VA N     - 6,985,936.69 11,902,790.04   sFT  0.99995476   +0 55 11.4
 HV4685;UTM  18      - 4,299,023.218   324,102.670   MT  0.99998100   -1 16 14.0
 HV4685
 HV4685_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2410299023(NAD 83)
 HV4685
 HV4685                          SUPERSEDED SURVEY CONTROL
 HV4685
 HV4685  NAD 83(1991)-  38 49 20.78546(N)    077 01 34.30153(W) AD(       ) 3
 HV4685  NAD 83(1986)-  38 49 20.78537(N)    077 01 34.31303(W) AD(       ) 3
 HV4685  NAD 27      -  38 49 20.37900(N)    077 01 35.39000(W) AD(       ) 3
 HV4685
 HV4685.Superseded values are not recommended for survey control.
 HV4685
 HV4685.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4685.See file dsdata.pdf to determine how the superseded data were derived.
 HV4685
 HV4685_MARKER: 43 = RADIO/TV TOWER
 HV4685
 HV4685  HISTORY     - Date     Condition        Report By
 HV4685  HISTORY     - 1928     FIRST OBSERVED   CGS
 HV4685  HISTORY     - 1938     GOOD             CGS
 HV4685
 HV4685                          STATION DESCRIPTION
 HV4685
 HV4685'DESCRIBED BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4685'STATION NOT PREVIOUSLY DESCRIBED.  STATION RECOVERED.  THIS
 HV4685'IS THE RADIO TOWER ON THE W END OF THE ADMINISTRATION BUILDING
 HV4685'AT THE NAVAL RESEARCH LABORATORY.  THE BUILDING IS ABOUT
 HV4685'50 FEET HIGH AND THE RADIO TOWER, WHICH IS A 4-LEGGED LATTICE
 HV4685'STEEL STRUCTURE, RISES ABOUT 50 FEET ABOVE TOP OF BUILDING.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4386 ***********************************************************************
 HV4386  DESIGNATION -  WESTERN 1935
 HV4386  PID         -  HV4386
 HV4386  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4386  COUNTRY     -  US
 HV4386  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4386
 HV4386                         *CURRENT SURVEY CONTROL
 HV4386  ______________________________________________________________________
 HV4386* NAD 83(1993) POSITION- 38 54 46.06671(N) 077 04 12.65806(W)   ADJUSTED
 HV4386* NAVD 88 ORTHO HEIGHT -    46.    (meters)      151.    (feet) SCALED
 HV4386  ______________________________________________________________________
 HV4386  GEOID HEIGHT    -        -31.999 (meters)                     GEOID18
 HV4386  LAPLACE CORR    -         -2.82  (seconds)                    DEFLEC18
 HV4386  HORZ ORDER      -  SECOND
 HV4386
 HV4386.The horizontal coordinates were established by classical geodetic methods
 HV4386.and adjusted by the National Geodetic Survey in November 1994.
 HV4386
 HV4386.The orthometric height was scaled from a topographic map.
 HV4386
 HV4386.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4386.GEOID18 height accuracy estimate available here.
 HV4386
 HV4386.Click photographs - Photos may exist for this station.
 HV4386
 HV4386.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4386
 HV4386. The following values were computed from the NAD 83(1993) position.
 HV4386
 HV4386;                    North         East     Units Scale Factor Converg.
 HV4386;SPC MD       -   138,328.136   393,913.166   MT  0.99995006   -0 02 38.6
 HV4386;SPC MD       -   453,831.56  1,292,363.45   sFT  0.99995006   -0 02 38.6
 HV4386;SPC VA N     - 2,139,286.344 3,624,002.044   MT  0.99996163   +0 53 32.5
 HV4386;SPC VA N     - 7,018,641.95 11,889,746.71   sFT  0.99996163   +0 53 32.5
 HV4386;UTM  18      - 4,309,136.860   320,511.084   MT  0.99999671   -1 18 02.5
 HV4386
 HV4386!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4386!SPC MD       -   0.99999784  x   0.99995006  =   0.99994790
 HV4386!SPC VA N     -   0.99999784  x   0.99996163  =   0.99995947
 HV4386!UTM  18      -   0.99999784  x   0.99999671  =   0.99999455
 HV4386
 HV4386:                Primary Azimuth Mark                     Grid Az
 HV4386:SPC MD       -  LINCOLN ECC 1935                         146 49 25.1
 HV4386:SPC VA N     -  LINCOLN ECC 1935                         145 53 14.0
 HV4386:UTM  18      -  LINCOLN ECC 1935                         148 04 49.0
 HV4386
 HV4386_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2051109136(NAD 83)
 HV4386
 HV4386|---------------------------------------------------------------------|
 HV4386| PID    Reference Object                     Distance      Geod. Az  |
 HV4386|                                                           dddmmss.s |
 HV4386| HV4445 WMAL RADIO MAST                     APPROX. 4.0 KM 1120414.5 |
 HV4386| HV4048 LINCOLN ECC 1935                    APPROX. 3.1 KM 1464646.5 |
 HV4386| HV3961 GEORGETOWN UNIV LOWER SPIRE         APPROX. 0.7 KM 1990210.4 |
 HV4386|---------------------------------------------------------------------|
 HV4386
 HV4386                          SUPERSEDED SURVEY CONTROL
 HV4386
 HV4386  NAD 83(1991)-  38 54 46.06550(N)    077 04 12.65963(W) AD(       ) 2
 HV4386  NAD 83(1986)-  38 54 46.06514(N)    077 04 12.66977(W) AD(       ) 2
 HV4386  NAD 27      -  38 54 45.66500(N)    077 04 13.74300(W) AD(       ) 2
 HV4386
 HV4386.Superseded values are not recommended for survey control.
 HV4386
 HV4386.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4386.See file dsdata.pdf to determine how the superseded data were derived.
 HV4386
 HV4386_MARKER: N = NAIL
 HV4386_SETTING: 0 = UNSPECIFIED SETTING
 HV4386_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4386
 HV4386  HISTORY     - Date     Condition        Report By
 HV4386  HISTORY     - 1935     MONUMENTED       CGS
 HV4386  HISTORY     - 1938     MARK NOT FOUND   CGS
 HV4386  HISTORY     - 1971     MARK NOT FOUND   NGS
 HV4386
 HV4386                          STATION DESCRIPTION
 HV4386
 HV4386'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4386'STATION IS ON TOP OF THE OLD PART OF THE BUILDING OF THE WESTERN
 HV4386'HIGH SCHOOL IN GEORGETOWN AT 35TH STREET NW AND RESERVIOR ROAD.
 HV4386'
 HV4386'THE STATION IS MARKED BY A GALVANIZED NAIL IN THE TAR ROOF OF
 HV4386'THE BUILDING.  THE STATION IS ON THE HIGHEST PART OF THE OLD
 HV4386'PART OF THE BUILDING, NEAR THE S END, 1.326 METERS N OF THE S
 HV4386'OUTSIDE EDGE OF S WALL, 10.454 METERS W OF THE INSIDE FACE OF
 HV4386'THE CONCRETE WALL ON THE E SIDE OF THE ROOF, 10.214 METERS E OF
 HV4386'THE INSIDE FACE OF THE CONCRETE WALL ON THE W SIDE OF THE ROOF
 HV4386'AND 5.145 METERS S OF SE CORNER OF STEEL RADIO MAST ON THE ROOF
 HV4386'OF BUILDING.
 HV4386'
 HV4386'APPARENTLY THE ROOF HAS BEEN RE-SURFACED RECENTLY, THEREBY
 HV4386'DESTROYING THE MARK ESTABLISHED BY THE NATIONAL CAPITOL PARK
 HV4386'SERVICE.
 HV4386
 HV4386                          STATION RECOVERY (1938)
 HV4386
 HV4386'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
 HV4386'ROOF OF BUILDING WAS NOT VISITED TO FIND NAIL, BUT FROM THE
 HV4386'GROUND THERE APPEARS TO HAVE BEEN NO CONSTRUCTION SINCE THE
 HV4386'ESTABLISHMENT OF STATION WHICH WOULD PREVENT RECOVERY FROM
 HV4386'REFERENCE TIES, GIVEN IN DESCRIPTION.
 HV4386
 HV4386                          STATION RECOVERY (1971)
 HV4386
 HV4386'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LFS)
 HV4386'THE NAIL MARKING THE STATION COULD NOT BE LOCATED.  HOWEVER, THE
 HV4386'POSITION FOR THIS STATION CAN BE DETERMINED FROM REFERENCE
 HV4386'POINTS GIVEN IN THE 1935 DESCRIPTION.
 HV4386'
 HV4386'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--DIST. OF COL.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1331 ***********************************************************************
 HV1331  DESIGNATION -  WHEELER DCDHT
 HV1331  PID         -  HV1331
 HV1331  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1331  COUNTRY     -  US
 HV1331  USGS QUAD   -  ANACOSTIA (2016)
 HV1331
 HV1331                         *CURRENT SURVEY CONTROL
 HV1331  ______________________________________________________________________
 HV1331* NAD 83(1986) POSITION- 38 50 13.     (N) 076 59 36.     (W)   SCALED
 HV1331* NAVD 88 ORTHO HEIGHT -    23.388 (meters)       76.73  (feet) ADJUSTED
 HV1331  ______________________________________________________________________
 HV1331  GEOID HEIGHT    -        -32.240 (meters)                     GEOID18
 HV1331  DYNAMIC HEIGHT  -         23.375 (meters)       76.69  (feet) COMP
 HV1331  MODELED GRAVITY -    980,087.5   (mgal)                       NAVD 88
 HV1331
 HV1331  VERT ORDER      -  FIRST     CLASS II
 HV1331
 HV1331.The horizontal coordinates were scaled from a map and have
 HV1331.an estimated accuracy of +/- 6 seconds.
 HV1331
 HV1331.The orthometric height was determined by differential leveling and
 HV1331.adjusted by the NATIONAL GEODETIC SURVEY
 HV1331.in June 1991.
 HV1331
 HV1331.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1331.GEOID18 height accuracy estimate available here.
 HV1331
 HV1331.Click photographs - Photos may exist for this station.
 HV1331
 HV1331.The dynamic height is computed by dividing the NAVD 88
 HV1331.geopotential number by the normal gravity value computed on the
 HV1331.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1331.degrees latitude (g = 980.6199 gals.).
 HV1331
 HV1331.The modeled gravity was interpolated from observed gravity values.
 HV1331
 HV1331
 HV1331_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ269005(NAD 83)
 HV1331
 HV1331                          SUPERSEDED SURVEY CONTROL
 HV1331
 HV1331  NGVD 29 (11/26/84)   23.630  (m)           77.53   (f) ADJUSTED    1 2
 HV1331
 HV1331.Superseded values are not recommended for survey control.
 HV1331
 HV1331.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1331.See file dsdata.pdf to determine how the superseded data were derived.
 HV1331
 HV1331_MARKER: Z = SEE DESCRIPTION
 HV1331_SETTING: 45 = UNSPECIFIED DEEP UNSLEEVED SETTING (10 FT.+)
 HV1331_SP_SET: UNSPECIFIED DEEP SET
 HV1331_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1331+STABILITY: SURFACE MOTION
 HV1331
 HV1331  HISTORY     - Date     Condition        Report By
 HV1331  HISTORY     - UNK      MONUMENTED       DCDHT
 HV1331  HISTORY     - 1942     GOOD             CGS
 HV1331  HISTORY     - 1954     GOOD             CGS
 HV1331
 HV1331                          STATION DESCRIPTION
 HV1331
 HV1331'DESCRIBED BY COAST AND GEODETIC SURVEY 1942
 HV1331'IN WASHINGTON.
 HV1331'IN SOUTHEAST WASHINGTON, AT THE WHEELER ROAD BRIDGE OVER OXON RUN,
 HV1331'NEAR THE NORTHWEST CORNER OF THE BRIDGE, 22.6 FEET NORTH OF THE
 HV1331'EXPANSION JOINT OVER THE NORTH ABUTMENT, 4.2 FEET WEST OF
 HV1331'THE FACE OF THE CURB, 4.3 FEET SOUTHWEST OF THE CENTER OF P.E.P.
 HV1331'CO. POLE 52291, AND UNDER A 10-INCH COVER MARKED WATER METER.
 HV1331'A DISTRICT OF COLUMBIA HIGHWAY DEPARTMENT SPECIAL DEEP MARK.
 HV1331'NOTE-- THIS IS A SPECIAL MARK AND ACCESS TO IT CAN BE OBTAINED
 HV1331'BY PREARRANGEMENT WITH ENGINEERS OF THE DISTRICT OF COLUMBIA
 HV1331'HIGHWAY DEPARTMENT.  IT WAS REPORTED IN MAY 1954 THAT THE
 HV1331'WATERMETER COVER IS MISSING AND THERE IS NO OIL IN THE PIPE.
 HV1331'THE CAP ON THE OUTSIDE PIPE IS BATTERED.
 HV1331
 HV1331                          STATION RECOVERY (1954)
 HV1331
 HV1331'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1954
 HV1331'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4382 ***********************************************************************
 HV4382  DESIGNATION -  WILSON
 HV4382  PID         -  HV4382
 HV4382  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4382  COUNTRY     -  US
 HV4382  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4382
 HV4382                         *CURRENT SURVEY CONTROL
 HV4382  ______________________________________________________________________
 HV4382* NAD 83(1993) POSITION- 38 56 56.04622(N) 077 04 41.38397(W)   ADJUSTED
 HV4382  ______________________________________________________________________
 HV4382  GEOID HEIGHT    -        -31.937 (meters)                     GEOID18
 HV4382  LAPLACE CORR    -         -2.70  (seconds)                    DEFLEC18
 HV4382  HORZ ORDER      -  THIRD
 HV4382
 HV4382.The horizontal coordinates were established by classical geodetic methods
 HV4382.and adjusted by the National Geodetic Survey in November 1994.
 HV4382
 HV4382.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4382.GEOID18 height accuracy estimate available here.
 HV4382
 HV4382.Click photographs - Photos may exist for this station.
 HV4382
 HV4382.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4382
 HV4382. The following values were computed from the NAD 83(1993) position.
 HV4382
 HV4382;                    North         East     Units Scale Factor Converg.
 HV4382;SPC MD       -   142,336.710   393,224.556   MT  0.99995066   -0 02 56.6
 HV4382;SPC MD       -   466,983.02  1,290,104.23   sFT  0.99995066   -0 02 56.6
 HV4382;SPC VA N     - 2,143,283.181 3,623,248.003   MT  0.99996507   +0 53 14.6
 HV4382;SPC VA N     - 7,031,754.90 11,887,272.82   sFT  0.99996507   +0 53 14.6
 HV4382;UTM  18      - 4,313,159.770   319,910.560   MT  0.99999937   -1 18 24.3
 HV4382
 HV4382_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1991013159(NAD 83)
 HV4382
 HV4382                          SUPERSEDED SURVEY CONTROL
 HV4382
 HV4382  NAD 83(1991)-  38 56 56.04552(N)    077 04 41.38505(W) AD(       ) 3
 HV4382  NAD 83(1986)-  38 56 56.04508(N)    077 04 41.39501(W) AD(       ) 3
 HV4382  NAD 27      -  38 56 55.64700(N)    077 04 42.46900(W) AD(       ) 3
 HV4382
 HV4382.Superseded values are not recommended for survey control.
 HV4382
 HV4382.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4382.See file dsdata.pdf to determine how the superseded data were derived.
 HV4382
 HV4382_MARKER: 84 = LIGHTNING ROD
 HV4382_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV4382+SATELLITE: SATELLITE OBSERVATIONS - March 15, 2012
 HV4382
 HV4382  HISTORY     - Date     Condition        Report By
 HV4382  HISTORY     - 1943     FIRST OBSERVED   CGS
 HV4382  HISTORY     - 19950601 GOOD             USPSQD
 HV4382  HISTORY     - 20120315 GOOD             GEOCAC
 HV4382
 HV4382                          STATION DESCRIPTION
 HV4382
 HV4382'DESCRIBED BY COAST AND GEODETIC SURVEY 1943 (WHB)
 HV4382'STATION IS THE CENTER OF THE LIGHTNING ROD ON SOUTHERN FACE
 HV4382'OF SQUARE-TOPED BRICK SMOKESTACK, APPROXIMATELY 125 FEET IN
 HV4382'HEIGHT, OF THE POWER HOUSE OF THE WOODROW WILSON HIGH SCHOOL.
 HV4382'
 HV4382'THE STACK IS 31 METERS E OF THE CENTER LINE OF FORT DRIVE,
 HV4382'BETWEEN ALBEMARLE AND BRANDYWINE STREETS, N.W.
 HV4382
 HV4382                          STATION RECOVERY (1995)
 HV4382
 HV4382'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4382'RECOVERED IN GOOD CONDITION.
 HV4382
 HV4382                          STATION RECOVERY (2012)
 HV4382
 HV4382'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV4382'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4760 ***********************************************************************
 HV4760  DESIGNATION -  WINGATE
 HV4760  PID         -  HV4760
 HV4760  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4760  COUNTRY     -  US
 HV4760  USGS QUAD   -  ALEXANDRIA (2019)
 HV4760
 HV4760                         *CURRENT SURVEY CONTROL
 HV4760  ______________________________________________________________________
 HV4760* NAD 83(1993) POSITION- 38 49 22.15261(N) 077 00 36.95818(W)   ADJUSTED
 HV4760* NAVD 88 ORTHO HEIGHT -    79.1   (meters)      260.    (feet) VERTCON3
 HV4760  ______________________________________________________________________
 HV4760  GEOID HEIGHT    -        -32.240 (meters)                     GEOID18
 HV4760  LAPLACE CORR    -         -3.05  (seconds)                    DEFLEC18
 HV4760  HORZ ORDER      -  FIRST
 HV4760
 HV4760.The horizontal coordinates were established by classical geodetic methods
 HV4760.and adjusted by the National Geodetic Survey in November 1994.
 HV4760
 HV4760.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4760.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4760
 HV4760.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4760.GEOID18 height accuracy estimate available here.
 HV4760
 HV4760.Click photographs - Photos may exist for this station.
 HV4760
 HV4760.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4760
 HV4760. The following values were computed from the NAD 83(1993) position.
 HV4760
 HV4760;                    North         East     Units Scale Factor Converg.
 HV4760;SPC MD       -   128,337.828   399,108.510   MT  0.99995027   -0 00 23.2
 HV4760;SPC MD       -   421,055.02  1,309,408.50   sFT  0.99995027   -0 00 23.2
 HV4760;SPC VA N     - 2,129,382.189 3,629,359.990   MT  0.99995479   +0 55 47.2
 HV4760;SPC VA N     - 6,986,148.07 11,907,325.23   sFT  0.99995479   +0 55 47.2
 HV4760;UTM  18      - 4,299,034.764   325,486.484   MT  0.99997503   -1 15 38.1
 HV4760
 HV4760!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4760!SPC MD       -   0.99999264  x   0.99995027  =   0.99994291
 HV4760!SPC VA N     -   0.99999264  x   0.99995479  =   0.99994743
 HV4760!UTM  18      -   0.99999264  x   0.99997503  =   0.99996767
 HV4760
 HV4760:                Primary Azimuth Mark                     Grid Az
 HV4760:SPC MD       -  WASHINGTON MONUMENT                      343 41 03.6
 HV4760:SPC VA N     -  WASHINGTON MONUMENT                      342 44 53.2
 HV4760:UTM  18      -  WASHINGTON MONUMENT                      344 56 18.5
 HV4760
 HV4760_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH2548699034(NAD 83)
 HV4760
 HV4760|---------------------------------------------------------------------|
 HV4760| PID    Reference Object                     Distance      Geod. Az  |
 HV4760|                                                           dddmmss.s |
 HV4760| DC7751 WINGATE BLDG ELEVR SHAFT NE CORNER    9.867 METERS 07555     |
 HV4760| DC7752 WINGATE BLDG ELEVR SHAFT SE CORNER    9.847 METERS 10319     |
 HV4760| HV4742 ALEXANDRIA GSA CENTER TANK          APPROX. 4.0 KM 2231040.0 |
 HV4760| HV4548 ALEXANDRIA ST MARYS RC CH           APPROX. 3.7 KM 2313221.7 |
 HV4760| HV4544 ALEXANDRIA CITY HALL GOLD BALL      APPROX. 3.5 KM 2360652.7 |
 HV4760| HV4743 ALEXANDRIA DOWNTOWN BAP CH          APPROX. 3.9 KM 2360912.9 |
 HV4760| HV4733 ALEXANDRIA NORTON AND CO TANK       APPROX. 2.7 KM 2454102.3 |
 HV4760| HV4442 WASHINGTON MONUMENT                 APPROX. 7.7 KM 3434040.4 |
 HV4760|---------------------------------------------------------------------|
 HV4760
 HV4760                          SUPERSEDED SURVEY CONTROL
 HV4760
 HV4760  NAD 83(1991)-  38 49 22.15129(N)    077 00 36.95941(W) AD(       ) 1
 HV4760  NAD 83(1986)-  38 49 22.15102(N)    077 00 36.97121(W) AD(       ) 1
 HV4760  NAD 27      -  38 49 21.74486(N)    077 00 38.05505(W) AD(       ) 1
 HV4760  NGVD 29 (07/19/86)   79.4    (m)          260.     (f) VERT ANG       
 HV4760
 HV4760.Superseded values are not recommended for survey control.
 HV4760
 HV4760.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4760.See file dsdata.pdf to determine how the superseded data were derived.
 HV4760
 HV4760_MARKER: DS = TRIANGULATION STATION DISK
 HV4760_SETTING: 0 = UNSPECIFIED SETTING
 HV4760
 HV4760  HISTORY     - Date     Condition        Report By
 HV4760  HISTORY     - 1970     MONUMENTED       NGS
 HV4760
 HV4760                          STATION DESCRIPTION
 HV4760
 HV4760'DESCRIBED BY NATIONAL GEODETIC SURVEY 1970 (JBJ)
 HV4760'THE STATION IS ON THE TOP OF THE ELEVATOR SHAFT, ON THE ROOF OF THE
 HV4760'WINGATE EAST APARTMENT BUILDING, ADDRESS 74 GALVESTON SOUTH WEST,
 HV4760'WASHINGTON, DISTRICT OF COLUMBIA.
 HV4760'
 HV4760'STATION MARK IS A STANDARD DISK, STAMPED WINGATE 1970, FASTENED TO
 HV4760'THE ROOF OF THE ELEVATOR SHAFT WITH ROOFING COMPOUND UNDER A 6 INCH
 HV4760'CYLINDRICAL COPPER CAP, THE CAP PROJECTS 8 INCHES ABOVE THE ROOF.
 HV4760'
 HV4760'THE REFERENCE POINTS IS A CROSS ETCHED IN THE CONCRETE OF THE
 HV4760'NORTHEAST AND THE NORTHWEST CORNERS OF THE ROOF OF THE ELEVATOR
 HV4760'SHAFT.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4445 ***********************************************************************
 HV4445  DESIGNATION -  WMAL RADIO MAST
 HV4445  PID         -  HV4445
 HV4445  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4445  COUNTRY     -  US
 HV4445  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4445
 HV4445                         *CURRENT SURVEY CONTROL
 HV4445  ______________________________________________________________________
 HV4445* NAD 83(1993) POSITION- 38 53 57.22677(N) 077 01 38.59987(W)   ADJUSTED
 HV4445  ______________________________________________________________________
 HV4445  GEOID HEIGHT    -        -32.078 (meters)                     GEOID18
 HV4445  LAPLACE CORR    -         -2.65  (seconds)                    DEFLEC18
 HV4445  HORZ ORDER      -  THIRD
 HV4445
 HV4445.The horizontal coordinates were established by classical geodetic methods
 HV4445.and adjusted by the National Geodetic Survey in November 1994.
 HV4445
 HV4445.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4445.GEOID18 height accuracy estimate available here.
 HV4445
 HV4445.Click photographs - Photos may exist for this station.
 HV4445
 HV4445.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4445
 HV4445. The following values were computed from the NAD 83(1993) position.
 HV4445
 HV4445;                    North         East     Units Scale Factor Converg.
 HV4445;SPC MD       -   136,820.144   397,624.159   MT  0.99994993   -0 01 01.9
 HV4445;SPC MD       -   448,884.09  1,304,538.59   sFT  0.99994993   -0 01 01.9
 HV4445;SPC VA N     - 2,137,839.181 3,627,737.226   MT  0.99996044   +0 55 08.7
 HV4445;SPC VA N     - 7,013,894.05 11,902,001.22   sFT  0.99996044   +0 55 08.7
 HV4445;UTM  18      - 4,307,547.797   324,188.261   MT  0.99998063   -1 16 24.3
 HV4445
 HV4445_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2418807547(NAD 83)
 HV4445
 HV4445                          SUPERSEDED SURVEY CONTROL
 HV4445
 HV4445  NAD 83(1991)-  38 53 57.22547(N)    077 01 38.60136(W) AD(       ) 3
 HV4445  NAD 83(1986)-  38 53 57.22499(N)    077 01 38.61192(W) AD(       ) 3
 HV4445  NAD 27      -  38 53 56.82500(N)    077 01 39.69000(W) AD(       ) 3
 HV4445
 HV4445.Superseded values are not recommended for survey control.
 HV4445
 HV4445.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4445.See file dsdata.pdf to determine how the superseded data were derived.
 HV4445
 HV4445_MARKER: 42 = RADIO/TV MAST
 HV4445
 HV4445  HISTORY     - Date     Condition        Report By
 HV4445  HISTORY     - 1935     FIRST OBSERVED   CGS
 HV4445  HISTORY     - 1939     GOOD             CGS
 HV4445  HISTORY     - 19950810 GOOD             USPSQD
 HV4445
 HV4445                          STATION DESCRIPTION
 HV4445
 HV4445'DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (JHB)
 HV4445'THIS STATION IS THE RADIO MAST OF THE WMAL BROADCASTING STATION
 HV4445'NEAR THE CORNER OF 11TH STREET NW AND H STREET NW.  THE TOWER
 HV4445'IS MOUNTED ON A THREE-STORY BUILDING, HAS A SPREAD OF ABOUT
 HV4445'20 FEET AT THE BASE AND IS ABOUT 1 FOOT SQUARE AT THE TOP WITH
 HV4445'A HEIGHT OF ABOUT 126 FEET.
 HV4445'
 HV4445'THIS TOWER COULD ONLY BE SEEN FROM THREE STATIONS, PHILLIPS,
 HV4445'WESTERN, AND AIRPORT.
 HV4445
 HV4445                          STATION RECOVERY (1939)
 HV4445
 HV4445'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1939 (TMP)
 HV4445'STATION RECOVERED INTACT.  DESCRIPTION ADEQUATE, EXCEPT
 HV4445'THAT THE STATION IS NOT LOCATED AT THE CORNER OF 11TH AND H
 HV4445'STREETS NW, BUT IS 185 FEET S OF THE S CURB OF H STREET
 HV4445'AND 65 FEET W OF THE W CURB OF 11TH STREET, NW.
 HV4445
 HV4445                          STATION RECOVERY (1995)
 HV4445
 HV4445'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4445'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4521 ***********************************************************************
 HV4521  DESIGNATION -  WMG 1981
 HV4521  PID         -  HV4521
 HV4521  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4521  COUNTRY     -  US
 HV4521  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4521
 HV4521                         *CURRENT SURVEY CONTROL
 HV4521  ______________________________________________________________________
 HV4521* NAD 83(1993) POSITION- 38 53 23.11175(N) 077 02 04.00383(W)   ADJUSTED
 HV4521* NAVD 88 ORTHO HEIGHT -    10.6   (meters)       35.    (feet) VERTCON3
 HV4521  ______________________________________________________________________
 HV4521  GEOID HEIGHT    -        -32.089 (meters)                     GEOID18
 HV4521  LAPLACE CORR    -         -2.53  (seconds)                    DEFLEC18
 HV4521  HORZ ORDER      -  SECOND
 HV4521
 HV4521.The horizontal coordinates were established by classical geodetic methods
 HV4521.and adjusted by the National Geodetic Survey in November 1994.
 HV4521
 HV4521.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4521.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4521
 HV4521.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4521.GEOID18 height accuracy estimate available here.
 HV4521
 HV4521.Click photographs - Photos may exist for this station.
 HV4521
 HV4521.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4521
 HV4521. The following values were computed from the NAD 83(1993) position.
 HV4521
 HV4521;                    North         East     Units Scale Factor Converg.
 HV4521;SPC MD       -   135,768.396   397,011.634   MT  0.99994988   -0 01 17.8
 HV4521;SPC MD       -   445,433.48  1,302,529.00   sFT  0.99994988   -0 01 17.8
 HV4521;SPC VA N     - 2,136,777.555 3,627,141.963   MT  0.99995964   +0 54 52.8
 HV4521;SPC VA N     - 7,010,411.03 11,900,048.26   sFT  0.99995964   +0 54 52.8
 HV4521;UTM  18      - 4,306,509.697   323,552.807   MT  0.99998338   -1 16 39.4
 HV4521
 HV4521!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4521!SPC MD       -   1.00000338  x   0.99994988  =   0.99995326
 HV4521!SPC VA N     -   1.00000338  x   0.99995964  =   0.99996302
 HV4521!UTM  18      -   1.00000338  x   0.99998338  =   0.99998676
 HV4521
 HV4521_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2355206509(NAD 83)
 HV4521
 HV4521|---------------------------------------------------------------------|
 HV4521| PID    Reference Object                     Distance      Geod. Az  |
 HV4521|                                                           dddmmss.s |
 HV4521| HV4519 15 CON                              290.514 METERS 01637     |
 HV4521| HV4243 COMMERCE                            335.748 METERS 02516     |
 HV4521|---------------------------------------------------------------------|
 HV4521
 HV4521                          SUPERSEDED SURVEY CONTROL
 HV4521
 HV4521  NAD 83(1991)-  38 53 23.11060(N)    077 02 04.00509(W) AD(       ) 2
 HV4521  NAD 83(1986)-  38 53 23.11017(N)    077 02 04.01578(W) AD(       ) 2
 HV4521  NAD 27      -  38 53 22.71104(N)    077 02 05.09519(W) AD(       ) 2
 HV4521  NGVD 29 (07/19/86)   10.8    (m)           35.     (f) VERT ANG       
 HV4521
 HV4521.Superseded values are not recommended for survey control.
 HV4521
 HV4521.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4521.See file dsdata.pdf to determine how the superseded data were derived.
 HV4521
 HV4521_MARKER: DD = SURVEY DISK
 HV4521_SETTING: 0 = UNSPECIFIED SETTING
 HV4521_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4521
 HV4521  HISTORY     - Date     Condition        Report By
 HV4521  HISTORY     - 1981     MONUMENTED       CANDA
 HV4521
 HV4521                          STATION DESCRIPTION
 HV4521
 HV4521'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4521'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE
 HV4521'LETTER C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4521'
 HV4521'STATION IS LOCATED ON THE NORTH SIDE OF AN ASPHALT SIDEWALK LEADING
 HV4521'TO THE WASHINGTON MONUMENT FROM 15TH STREET N.W.
 HV4521'
 HV4521'STATION IS 21.18 FT. NORTH OF PK AND CAP IN 4 FT X 4 FT ASPHALT
 HV4521'PAD.
 HV4521'
 HV4521'STATION IS 49.35 FT NORTHWEST OF LIGHT POLE BASE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DO9450 ***********************************************************************
 DO9450  DESIGNATION -  WNY1
 DO9450  PID         -  DO9450
 DO9450  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DO9450  COUNTRY     -  US
 DO9450  USGS QUAD   -  ANACOSTIA (2016)
 DO9450
 DO9450                         *CURRENT SURVEY CONTROL
 DO9450  ______________________________________________________________________
 DO9450* NAD 83(2011) POSITION- 38 52 22.27466(N) 076 59 53.61500(W)   ADJUSTED
 DO9450* NAD 83(2011) ELLIP HT-   -29.411 (meters)        (09/09/13)   ADJUSTED
 DO9450* NAD 83(2011) EPOCH   -  2010.00
 DO9450* NAVD 88 ORTHO HEIGHT -     2.8   (meters)        9.    (feet) GPS OBS
 DO9450  ______________________________________________________________________
 DO9450  NAVD 88 orthometric height was determined with geoid model    GEOID12A
 DO9450  GEOID HEIGHT    -        -32.176 (meters)                     GEOID12A
 DO9450  GEOID HEIGHT    -        -32.179 (meters)                     GEOID18
 DO9450  NAD 83(2011) X  -  1,118,646.007 (meters)                     COMP
 DO9450  NAD 83(2011) Y  - -4,844,703.975 (meters)                     COMP
 DO9450  NAD 83(2011) Z  -  3,981,319.293 (meters)                     COMP
 DO9450  LAPLACE CORR    -         -3.15  (seconds)                    DEFLEC18
 DO9450
 DO9450  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 DO9450  Standards:
 DO9450         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 DO9450            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 DO9450  -------------------------------------------------------------------
 DO9450  NETWORK    0.83   2.21           0.38   0.28   1.13      0.03937957
 DO9450  -------------------------------------------------------------------
 DO9450  Click here for local accuracies and other accuracy information.
 DO9450
 DO9450.The horizontal coordinates were established by GPS observations
 DO9450.and adjusted by the GEOMETRICS GPS INCORPORATED in September 2013.
 DO9450
 DO9450.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 DO9450.been affixed to the stable North American tectonic plate. See 
 DO9450.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 DO9450
 DO9450.The horizontal coordinates are valid at the epoch date displayed above
 DO9450.which is a decimal equivalence of Year/Month/Day.
 DO9450
 DO9450.The orthometric height was determined by GPS observations and a
 DO9450.high-resolution geoid model.
 DO9450
 DO9450.Significant digits in the geoid height do not necessarily reflect accuracy.
 DO9450.GEOID18 height accuracy estimate available here.
 DO9450
 DO9450.Click photographs - Photos may exist for this station.
 DO9450
 DO9450.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 DO9450
 DO9450.The Laplace correction was computed from DEFLEC18 derived deflections.
 DO9450
 DO9450.The ellipsoidal height was determined by GPS observations
 DO9450.and is referenced to NAD 83.
 DO9450
 DO9450. The following values were computed from the NAD 83(2011) position.
 DO9450
 DO9450;                    North         East     Units Scale Factor Converg.
 DO9450;UTM  18      - 4,304,564.730   326,653.286   MT  0.99997003   -1 15 15.8
 DO9450
 DO9450!             -  Elev Factor  x  Scale Factor =   Combined Factor
 DO9450!UTM  18      -   1.00000461  x   0.99997003  =   0.99997464
 DO9450
 DO9450_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2665304564(NAD 83)
 DO9450
 DO9450|---------------------------------------------------------------------|
 DO9450| PID    Reference Object                     Distance      Geod. Az  |
 DO9450|                                                           dddmmss.s |
 DO9450| DO9451 WNY2                                390.254 METERS 05312     |
 DO9450|---------------------------------------------------------------------|
 DO9450
 DO9450                          SUPERSEDED SURVEY CONTROL
 DO9450
 DO9450.No superseded survey control is available for this station.
 DO9450
 DO9450_MARKER: DD = SURVEY DISK
 DO9450_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DO9450_STAMPING: WNY1 2013
 DO9450_MARK LOGO: USN
 DO9450_PROJECTION: FLUSH
 DO9450_MAGNETIC: N = NO MAGNETIC MATERIAL
 DO9450_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DO9450+STABILITY: SURFACE MOTION
 DO9450_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 DO9450+SATELLITE: SATELLITE OBSERVATIONS - June 10, 2013
 DO9450
 DO9450  HISTORY     - Date     Condition        Report By
 DO9450  HISTORY     - 20130610 MONUMENTED       GEOMET
 DO9450
 DO9450                          STATION DESCRIPTION
 DO9450
 DO9450'DESCRIBED BY GEOMETRICS GPS INCORPORATED 2013 (DWB)
 DO9450'THE STATION IS LOCATED ABOUT 28.5 MI (45.9 KM) WEST OF ANNAPOLIS
 DO9450'MARYLAND, 17.14 MI (27.6 KM) EAST OF FAIRFAX, VIRGINIA.  10.61 MI
 DO9450'(17.1 KM) SOUTHEAST OF MCLEAN, VIRGINIA.
 DO9450'
 DO9450'TO REACH FROM THE INTERSECTION OF M STREET SOUTHEAST AND 10TH STREET
 DO9450'SOUTHEAST, GO SOUTH ON 10TH STREET SOUTHEAST 0.13 MI (0.2 KM) TO AN
 DO9450'INTERSECTION WITH NORTH STREET SOUTHEAST.  TURN RIGHT AND GO WEST 0.08
 DO9450'MI (0.1 KM) TO AN INTERSECTION WITH HARWOOD STREET.  TURN LEFT AND GO
 DO9450'SOUTH 0.09 MI (0.1 KM) TO AN INTERSECTION WITH PAULDING AVENUE.  TURN
 DO9450'LEFT AND GO 0.04 MI (0.1 KM) TO AN INTERSECTION WITH SICARD ST
 DO9450'SOUTHEAST.  TURN RIGHT AND GO 0.16 MI (0.3 KM) TO THE MONUMENT ON THE
 DO9450'LEFT.
 DO9450'
 DO9450'THE STATION IS A DISK STAMPED --WNY1-- SET IN A ROUND CONCRETE
 DO9450'MONUMENT 1.2 M (3.9 FT) DEEP AND 0.3 M (1.0 FT) IN DIAMETER.  THE MARK
 DO9450'IS SET FLUSH WITH THE GROUND.  THE MARK IS 92.3 FT (28.1 M) EAST OF A
 DO9450'4 FT (1.2 M) TALL SIDEWALK LIGHT POLE, 53.4 FT (16.3 M) SOUTHEAST OF A
 DO9450'4 FT (1.2 M) TALL SIDEWALK LIGHT POLE, 45.5 FT (13.9 M) SOUTH OF A 4
 DO9450'FT (1.2 M) TALL SIDEWALK LIGHT POLE, 79 FT (24.1 M) SOUTHWEST OF A 4
 DO9450'FT (1.2 M) TALL SIDEWALK LIGHT POLE AT THE SIDEWALK INTERSECTION ON
 DO9450'THE WESTERN SIDE OF ISAAC HULL AVENUE AND A SIDEWALK INTERSECTING FROM
 DO9450'THE SOUTHWEST, 126.9 FT (38.7 M) NORTHWEST OF A LIGHT POLE, 104.7 FT
 DO9450'(31.9 M) NORTHWEST OF A FIRE ALARM POLE NUMBER 10 13, 128.6 FT (39.2
 DO9450'M) WEST OF THE EDGE OF PAVEMENT ON ISAAC HULL AVENUE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 DO9451 ***********************************************************************
 DO9451  DESIGNATION -  WNY2
 DO9451  PID         -  DO9451
 DO9451  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 DO9451  COUNTRY     -  US
 DO9451  USGS QUAD   -  WASHINGTON EAST (2016)
 DO9451
 DO9451                         *CURRENT SURVEY CONTROL
 DO9451  ______________________________________________________________________
 DO9451* NAD 83(2011) POSITION- 38 52 29.85504(N) 076 59 40.65115(W)   ADJUSTED
 DO9451* NAD 83(2011) ELLIP HT-   -25.298 (meters)        (09/09/13)   ADJUSTED
 DO9451* NAD 83(2011) EPOCH   -  2010.00
 DO9451* NAVD 88 ORTHO HEIGHT -     6.9   (meters)       23.    (feet) GPS OBS
 DO9451  ______________________________________________________________________
 DO9451  NAVD 88 orthometric height was determined with geoid model    GEOID12A
 DO9451  GEOID HEIGHT    -        -32.178 (meters)                     GEOID12A
 DO9451  GEOID HEIGHT    -        -32.181 (meters)                     GEOID18
 DO9451  NAD 83(2011) X  -  1,118,918.203 (meters)                     COMP
 DO9451  NAD 83(2011) Y  - -4,844,493.835 (meters)                     COMP
 DO9451  NAD 83(2011) Z  -  3,981,503.859 (meters)                     COMP
 DO9451  LAPLACE CORR    -         -3.23  (seconds)                    DEFLEC18
 DO9451
 DO9451  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 DO9451  Standards:
 DO9451         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 DO9451            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 DO9451  -------------------------------------------------------------------
 DO9451  NETWORK    0.80   2.21           0.37   0.27   1.13      0.03713662
 DO9451  -------------------------------------------------------------------
 DO9451  Click here for local accuracies and other accuracy information.
 DO9451
 DO9451.The horizontal coordinates were established by GPS observations
 DO9451.and adjusted by the GEOMETRICS GPS INCORPORATED in September 2013.
 DO9451
 DO9451.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 DO9451.been affixed to the stable North American tectonic plate. See 
 DO9451.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 DO9451
 DO9451.The horizontal coordinates are valid at the epoch date displayed above
 DO9451.which is a decimal equivalence of Year/Month/Day.
 DO9451
 DO9451.The orthometric height was determined by GPS observations and a
 DO9451.high-resolution geoid model.
 DO9451
 DO9451.Significant digits in the geoid height do not necessarily reflect accuracy.
 DO9451.GEOID18 height accuracy estimate available here.
 DO9451
 DO9451.Click photographs - Photos may exist for this station.
 DO9451
 DO9451.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 DO9451
 DO9451.The Laplace correction was computed from DEFLEC18 derived deflections.
 DO9451
 DO9451.The ellipsoidal height was determined by GPS observations
 DO9451.and is referenced to NAD 83.
 DO9451
 DO9451. The following values were computed from the NAD 83(2011) position.
 DO9451
 DO9451;                    North         East     Units Scale Factor Converg.
 DO9451;UTM  18      - 4,304,791.588   326,970.815   MT  0.99996868   -1 15 07.9
 DO9451
 DO9451!             -  Elev Factor  x  Scale Factor =   Combined Factor
 DO9451!UTM  18      -   1.00000397  x   0.99996868  =   0.99997265
 DO9451
 DO9451_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2697004791(NAD 83)
 DO9451
 DO9451|---------------------------------------------------------------------|
 DO9451| PID    Reference Object                     Distance      Geod. Az  |
 DO9451|                                                           dddmmss.s |
 DO9451| DO9450 WNY1                                390.254 METERS 23312     |
 DO9451|---------------------------------------------------------------------|
 DO9451
 DO9451                          SUPERSEDED SURVEY CONTROL
 DO9451
 DO9451.No superseded survey control is available for this station.
 DO9451
 DO9451_MARKER: DD = SURVEY DISK
 DO9451_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 DO9451_STAMPING: WNY2 2013
 DO9451_MARK LOGO: USN
 DO9451_PROJECTION: FLUSH
 DO9451_MAGNETIC: N = NO MAGNETIC MATERIAL
 DO9451_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 DO9451+STABILITY: SURFACE MOTION
 DO9451_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 DO9451+SATELLITE: SATELLITE OBSERVATIONS - July 15, 2019
 DO9451
 DO9451  HISTORY     - Date     Condition        Report By
 DO9451  HISTORY     - 20130610 MONUMENTED       GEOMET
 DO9451  HISTORY     - 20190715 GOOD             USPSQD
 DO9451
 DO9451                          STATION DESCRIPTION
 DO9451
 DO9451'DESCRIBED BY GEOMETRICS GPS INCORPORATED 2013 (DWB)
 DO9451'THE STATION IS LOCATED ABOUT 28.5 MI (45.9 KM) WEST OF ANNAPOLIS
 DO9451'MARYLAND, 17.14 MI (27.6 KM) EAST OF FAIRFAX, VIRGINIA.  10.61 MI
 DO9451'(17.1 KM) SOUTHEAST OF MCLEAN, VIRGINIA.
 DO9451'
 DO9451'TO REACH FROM THE INTERSECTION OF M STREET SOUTHEAST AND 10TH STREET
 DO9451'SOUTHEAST, GO SOUTH ON 10TH STREET SOUTHEAST 0.13 MI (0.2 KM) TO AN
 DO9451'INTERSECTION WITH NORTH STREET SOUTHEAST.  TURN RIGHT AND GO WEST 0.08
 DO9451'MI (0.1 KM) TO AN INTERSECTION WITH HARWOOD STREET.  TURN RIGHT AND GO
 DO9451'NORTH 0.01 MI (0.0 KM) TO AN INTERSECTION WITH KIDDER BREESE STREET.
 DO9451'TURN LEFT AND GO WEST 0.02 MI (0.0 KM) TO THE STATION ON THE RIGHT.
 DO9451'
 DO9451'THE STATION IS A DISK STAMPED --WNY2-- SET IN A ROUND CONCRETE
 DO9451'MONUMENT 1.2 M (3.9 FT) DEEP AND 0.3 M (1.0 FT) IN DIAMETER.  THE MARK
 DO9451'IS SET FLUSH WITH THE GROUND.  THE MARK IS 47.4 FT (14.4 M) WEST OF
 DO9451'THE NORTHEAST CORNER OF THE BRICK PAVERS, 19.8 FT (6.0 M) WEST OF THE
 DO9451'NORTHWEST CORNER OF THE BRICK PAVERS, 33.1 FT (10.1 M) NORTHWEST OF
 DO9451'THE CENTER OF A LARGE DECORATIVE ANCHOR, 9.4 FT (2.9 M) NORTHEAST OF A
 DO9451'LIGHT POLE, 46.2 FT (14.1 M) SOUTHEAST OF A SPEAKER POLE, 37 FT (11.3
 DO9451'M) NORTH OF THE EDGE OF PAVEMENT ON KIDDER BREESE ST.
 DO9451
 DO9451                          STATION RECOVERY (2019)
 DO9451
 DO9451'RECOVERY NOTE BY US POWER SQUADRON 2019 (RJS)
 DO9451'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4517 ***********************************************************************
 HV4517  DESIGNATION -  WP
 HV4517  PID         -  HV4517
 HV4517  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4517  COUNTRY     -  US
 HV4517  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4517
 HV4517                         *CURRENT SURVEY CONTROL
 HV4517  ______________________________________________________________________
 HV4517* NAD 83(1993) POSITION- 38 53 44.78498(N) 077 01 51.39197(W)   ADJUSTED
 HV4517* NAVD 88 ORTHO HEIGHT -     5.46  (+/-2cm)       17.9   (feet) VERTCON3
 HV4517  ______________________________________________________________________
 HV4517  GEOID HEIGHT    -        -32.081 (meters)                     GEOID18
 HV4517  LAPLACE CORR    -         -2.53  (seconds)                    DEFLEC18
 HV4517  HORZ ORDER      -  SECOND
 HV4517  VERT ORDER      -  THIRD ? (See Below)
 HV4517
 HV4517.The horizontal coordinates were established by classical geodetic methods
 HV4517.and adjusted by the National Geodetic Survey in November 1994.
 HV4517
 HV4517.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV4517.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV4517
 HV4517.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4517.GEOID18 height accuracy estimate available here.
 HV4517
 HV4517.The vertical order pertains to the NGVD 29 superseded value.
 HV4517
 HV4517.Click photographs - Photos may exist for this station.
 HV4517
 HV4517.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4517
 HV4517. The following values were computed from the NAD 83(1993) position.
 HV4517
 HV4517;                    North         East     Units Scale Factor Converg.
 HV4517;SPC MD       -   136,436.593   397,315.794   MT  0.99994991   -0 01 09.9
 HV4517;SPC MD       -   447,625.72  1,303,526.90   sFT  0.99994991   -0 01 09.9
 HV4517;SPC VA N     - 2,137,450.639 3,627,435.166   MT  0.99996015   +0 55 00.7
 HV4517;SPC VA N     - 7,012,619.30 11,901,010.21   sFT  0.99996015   +0 55 00.7
 HV4517;UTM  18      - 4,307,171.087   323,871.551   MT  0.99998200   -1 16 32.0
 HV4517
 HV4517!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4517!SPC MD       -   1.00000418  x   0.99994991  =   0.99995409
 HV4517!SPC VA N     -   1.00000418  x   0.99996015  =   0.99996433
 HV4517!UTM  18      -   1.00000418  x   0.99998200  =   0.99998618
 HV4517
 HV4517:                Primary Azimuth Mark                     Grid Az
 HV4517:SPC MD       -  WP AZ MK                                 078 44 28.0
 HV4517:SPC VA N     -  WP AZ MK                                 077 48 17.4
 HV4517:UTM  18      -  WP AZ MK                                 079 59 50.1
 HV4517
 HV4517_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2387107171(NAD 83)
 HV4517
 HV4517|---------------------------------------------------------------------|
 HV4517| PID    Reference Object                     Distance      Geod. Az  |
 HV4517|                                                           dddmmss.s |
 HV4517| HV4516 13 E                                130.769 METERS 07708     |
 HV4517| DC7771 WP AZ MK                                           0784318.1 |
 HV4517| HV4513 11 PEN                              374.513 METERS 11232     |
 HV4517| HV4518 15 E                                224.584 METERS 25738     |
 HV4517|---------------------------------------------------------------------|
 HV4517
 HV4517                          SUPERSEDED SURVEY CONTROL
 HV4517
 HV4517  NAD 83(1991)-  38 53 44.78383(N)    077 01 51.39322(W) AD(       ) 2
 HV4517  NAD 83(1986)-  38 53 44.78338(N)    077 01 51.40386(W) AD(       ) 2
 HV4517  NAD 27      -  38 53 44.38397(N)    077 01 52.48343(W) AD(       ) 2
 HV4517  NGVD 29 (07/19/86)    5.70   (m)           18.7    (f) LEVELING    3  
 HV4517
 HV4517.Superseded values are not recommended for survey control.
 HV4517
 HV4517.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4517.See file dsdata.pdf to determine how the superseded data were derived.
 HV4517
 HV4517_MARKER: DD = SURVEY DISK
 HV4517_SETTING: 0 = UNSPECIFIED SETTING
 HV4517
 HV4517  HISTORY     - Date     Condition        Report By
 HV4517  HISTORY     - 1981     MONUMENTED       CANDA
 HV4517
 HV4517                          STATION DESCRIPTION
 HV4517
 HV4517'DESCRIBED BY CERVANTES AND ASSOCIATES 1981 (GCC)
 HV4517'THE SURVEY POINT IS A PUNCH HOLE LOCATED IN THE OPENING OF THE
 HV4517'LETTER C IN A 3-1/2 INCH DIAMETER BRASS DISK.
 HV4517'
 HV4517'STATION IS LOCATED IN GRASSY AREA BORDERED BA A STONE MAP OF WASH.
 HV4517'D.C. ON THE CORNER OF PA. AVE N.W. AND 13TH STREET N.W.
 HV4517'
 HV4517'STATION IS 43.98 FT. NW OF CORNER OF STONEWALL ON PA. AVE.
 HV4517'
 HV4517'STATION IS 47.12 FT W OF BOTTOM OF CROSS IN STONE MAP.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1400 ***********************************************************************
 HV1400  TIDAL BM    -  This is a Tidal Bench Mark.
 HV1400  DESIGNATION -  X
 HV1400  PID         -  HV1400
 HV1400  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1400  COUNTRY     -  US
 HV1400  USGS QUAD   -  ANACOSTIA (2016)
 HV1400
 HV1400                         *CURRENT SURVEY CONTROL
 HV1400  ______________________________________________________________________
 HV1400* NAD 83(1986) POSITION- 38 52 25.     (N) 076 59 40.     (W)   SCALED
 HV1400* NAVD 88 ORTHO HEIGHT -     3.342 (meters)       10.96  (feet) ADJUSTED
 HV1400  ______________________________________________________________________
 HV1400  GEOID HEIGHT    -        -32.184 (meters)                     GEOID18
 HV1400  DYNAMIC HEIGHT  -          3.340 (meters)       10.96  (feet) COMP
 HV1400  MODELED GRAVITY -    980,096.1   (mgal)                       NAVD 88
 HV1400
 HV1400  VERT ORDER      -  SECOND    CLASS I
 HV1400
 HV1400.The horizontal coordinates were scaled from a map and have
 HV1400.an estimated accuracy of +/- 6 seconds.
 HV1400
 HV1400.The orthometric height was determined by differential leveling and
 HV1400.adjusted by the NATIONAL GEODETIC SURVEY
 HV1400.in October 2001.
 HV1400
 HV1400.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1400.GEOID18 height accuracy estimate available here.
 HV1400
 HV1400.This Tidal Bench Mark is designated as VM 12745
 HV1400.by the CENTER FOR OPERATIONAL OCEANOGRAPHIC PRODUCTS AND SERVICES.
 HV1400
 HV1400.Click photographs - Photos may exist for this station.
 HV1400
 HV1400.The dynamic height is computed by dividing the NAVD 88
 HV1400.geopotential number by the normal gravity value computed on the
 HV1400.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1400.degrees latitude (g = 980.6199 gals.).
 HV1400
 HV1400.The modeled gravity was interpolated from observed gravity values.
 HV1400
 HV1400
 HV1400_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ269046(NAD 83)
 HV1400
 HV1400                          SUPERSEDED SURVEY CONTROL
 HV1400
 HV1400  NAVD 88 (06/15/91)    3.339  (m)           10.95   (f) SUPERSEDED  1 2
 HV1400  NGVD 29 (11/26/84)    3.579  (m)           11.74   (f) ADJUSTED    1 2
 HV1400
 HV1400.Superseded values are not recommended for survey control.
 HV1400
 HV1400.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1400.See file dsdata.pdf to determine how the superseded data were derived.
 HV1400
 HV1400_MARKER: DB = BENCH MARK DISK
 HV1400_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV1400_SP_SET: DOORSILL
 HV1400_STAMPING: X
 HV1400_MARK LOGO: CGS
 HV1400_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1400_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1400_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1400+SATELLITE: SATELLITE OBSERVATIONS - July 15, 2019
 HV1400
 HV1400  HISTORY     - Date     Condition        Report By
 HV1400  HISTORY     - 1923     MONUMENTED       CGS
 HV1400  HISTORY     - 1955     GOOD             CGS
 HV1400  HISTORY     - 20010716 GOOD             NGS
 HV1400  HISTORY     - 20120315 GOOD             GEOCAC
 HV1400  HISTORY     - 20190715 GOOD             USPSQD
 HV1400
 HV1400                          STATION DESCRIPTION
 HV1400
 HV1400'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1400'IN WASHINGTON.
 HV1400'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1400'NEAR THE NORTHEAST CORNER OF THE INTERSECTION OF DAHLGREN AVENUE
 HV1400'AND MONTGOMERY SQUARE, ON THE WEST SIDE OF BUILDING 108, IN THE
 HV1400'FIRST DOORWAY FROM THE SOUTH END OF THE BUILDING, IN THE GRANITE
 HV1400'DOORSILL, 0.9 FOOT WEST OF THE DOOR, AND 0.3 FOOT NORTH OF
 HV1400'THE SOUTH END OF THE DOORWAY.  A STANDARD DISK, STAMPED X.
 HV1400
 HV1400                          STATION RECOVERY (1955)
 HV1400
 HV1400'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1400'RECOVERED IN GOOD CONDITION.
 HV1400
 HV1400                          STATION RECOVERY (2001)
 HV1400
 HV1400'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 HV1400'RECOVERED AS DESCRIBED.
 HV1400
 HV1400                          STATION RECOVERY (2012)
 HV1400
 HV1400'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV1400'RECOVERED IN GOOD CONDITION.
 HV1400
 HV1400                          STATION RECOVERY (2019)
 HV1400
 HV1400'RECOVERY NOTE BY US POWER SQUADRON 2019 (RJS)
 HV1400'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV2027 ***********************************************************************
 HV2027  DESIGNATION -  X 1
 HV2027  PID         -  HV2027
 HV2027  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV2027  COUNTRY     -  US
 HV2027  USGS QUAD   -  ALEXANDRIA (2019)
 HV2027
 HV2027                         *CURRENT SURVEY CONTROL
 HV2027  ______________________________________________________________________
 HV2027* NAD 83(1986) POSITION- 38 49 11.     (N) 077 01 27.     (W)   SCALED
 HV2027* NAVD 88 ORTHO HEIGHT -     5.967 (meters)       19.58  (feet) ADJUSTED
 HV2027  ______________________________________________________________________
 HV2027  GEOID HEIGHT    -        -32.224 (meters)                     GEOID18
 HV2027  DYNAMIC HEIGHT  -          5.964 (meters)       19.57  (feet) COMP
 HV2027  MODELED GRAVITY -    980,090.4   (mgal)                       NAVD 88
 HV2027
 HV2027  VERT ORDER      -  FIRST     CLASS II
 HV2027
 HV2027.The horizontal coordinates were scaled from a map and have
 HV2027.an estimated accuracy of +/- 6 seconds.
 HV2027
 HV2027.The orthometric height was determined by differential leveling and
 HV2027.adjusted by the NATIONAL GEODETIC SURVEY
 HV2027.in June 1991.
 HV2027
 HV2027.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV2027.GEOID18 height accuracy estimate available here.
 HV2027
 HV2027.Click photographs - Photos may exist for this station.
 HV2027
 HV2027.The dynamic height is computed by dividing the NAVD 88
 HV2027.geopotential number by the normal gravity value computed on the
 HV2027.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV2027.degrees latitude (g = 980.6199 gals.).
 HV2027
 HV2027.The modeled gravity was interpolated from observed gravity values.
 HV2027
 HV2027
 HV2027_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUH242987(NAD 83)
 HV2027
 HV2027                          SUPERSEDED SURVEY CONTROL
 HV2027
 HV2027  NGVD 29 (11/26/84)    6.233  (m)           20.45   (f) ADJUSTED    1 2
 HV2027
 HV2027.Superseded values are not recommended for survey control.
 HV2027
 HV2027.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV2027.See file dsdata.pdf to determine how the superseded data were derived.
 HV2027
 HV2027_MARKER: DB = BENCH MARK DISK
 HV2027_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV2027_SP_SET: FOOTING
 HV2027_STAMPING: 20 X 1 1931
 HV2027_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV2027
 HV2027  HISTORY     - Date     Condition        Report By
 HV2027  HISTORY     - 1931     MONUMENTED       CGS
 HV2027  HISTORY     - 1950     GOOD             CGS
 HV2027
 HV2027                          STATION DESCRIPTION
 HV2027
 HV2027'DESCRIBED BY COAST AND GEODETIC SURVEY 1931
 HV2027'AT WASHINGTON.
 HV2027'AT WASHINGTON, AT THE NAVAL RESEARCH LABORATORY AT BELLEVUE,
 HV2027'NEAR THE SOUTHWEST CORNER OF BUILDING 26, AT THE CENTER RADIO
 HV2027'TOWER (THE CENTER ONE OF A GROUP OF FOUR TOWERS), IN THE TOP
 HV2027'OF THE MOST EASTERLY CONCRETE FOOTING, AND ABOUT 3 FEET ABOVE
 HV2027'THE GROUND.  A STANDARD DISK, STAMPED 20 X 1 1931.
 HV2027
 HV2027                          STATION RECOVERY (1950)
 HV2027
 HV2027'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1950
 HV2027'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8037 ***********************************************************************
 HV8037  DESIGNATION -  X 2
 HV8037  PID         -  HV8037
 HV8037  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8037  COUNTRY     -  US
 HV8037  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8037
 HV8037                         *CURRENT SURVEY CONTROL
 HV8037  ______________________________________________________________________
 HV8037* NAD 83(1986) POSITION- 38 53 53.     (N) 077 02 14.     (W)   SCALED
 HV8037* NAVD 88 ORTHO HEIGHT -    18.093 (meters)       59.36  (feet) ADJUSTED
 HV8037  ______________________________________________________________________
 HV8037  GEOID HEIGHT    -        -32.068 (meters)                     GEOID18
 HV8037  DYNAMIC HEIGHT  -         18.083 (meters)       59.33  (feet) COMP
 HV8037  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 HV8037
 HV8037  VERT ORDER      -  FIRST     CLASS 0
 HV8037
 HV8037.The horizontal coordinates were scaled from a map and have
 HV8037.an estimated accuracy of +/- 6 seconds.
 HV8037
 HV8037.The orthometric height was determined by differential leveling and
 HV8037.adjusted by the NATIONAL GEODETIC SURVEY
 HV8037.in June 1991.
 HV8037
 HV8037.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8037.GEOID18 height accuracy estimate available here.
 HV8037
 HV8037.Click photographs - Photos may exist for this station.
 HV8037
 HV8037.The dynamic height is computed by dividing the NAVD 88
 HV8037.geopotential number by the normal gravity value computed on the
 HV8037.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8037.degrees latitude (g = 980.6199 gals.).
 HV8037
 HV8037.The modeled gravity was interpolated from observed gravity values.
 HV8037
 HV8037
 HV8037_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ233074(NAD 83)
 HV8037
 HV8037                          SUPERSEDED SURVEY CONTROL
 HV8037
 HV8037  NGVD 29 (??/??/92)   18.327  (m)           60.13   (f) ADJ UNCH    1 0
 HV8037
 HV8037.Superseded values are not recommended for survey control.
 HV8037
 HV8037.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8037.See file dsdata.pdf to determine how the superseded data were derived.
 HV8037
 HV8037_MARKER: DB = BENCH MARK DISK
 HV8037_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV8037_STAMPING: X 2 1949
 HV8037_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV8037+STABILITY: SURFACE MOTION
 HV8037
 HV8037  HISTORY     - Date     Condition        Report By
 HV8037  HISTORY     - 1949     MONUMENTED       CGS
 HV8037
 HV8037                          STATION DESCRIPTION
 HV8037
 HV8037'DESCRIBED BY COAST AND GEODETIC SURVEY 1949
 HV8037'IN WASHINGTON DC.
 HV8037'AT WASHINGTON D.C. ON THE WHITE HOUSE GROUND, ABOUT 150 FEET NORTH 10
 HV8037'DEGREE EAST FROM THE NORTHWEST CORNER OF THE WHITE HOUSE, 63.5 FEET
 HV8037'EAST OF BENCH MARK W 2 1949, 47.0 FEET FEET SOUTHEAST OF THE FOURTH
 HV8037'TREE (24 INCH IN 1952) NORTH OF THE DRIVEWAY, 44.2 FEET NORTHEAST OF
 HV8037'THE CENTER OF THE SECOND TREE (20 INCH IN 1952) NORTH OF THE
 HV8037'DRIVEWAY, 33.6 FEET EAST OF THE CENTER OF THE THIRD TREE (22 INCH IN
 HV8037'1952) NORTH OF THE DRIVEWAY, 33.3 FEET SOUTHWEST OF THE CENTER OF A
 HV8037'RECTANGULAR (7- BY 9-INCH) CAST-IRON VALVE-BOX COVER, AND ABOUT FLUSH
 HV8037'WITH THE SURFACE OF THE GROUND, A BRACE DISK, STAMPED 'X 2 1942' AND
 HV8037'SET IN THE TOP OF A CONCRETE POST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1877 ***********************************************************************
 HV1877  DESIGNATION -  XI=TIDAL BM
 HV1877  PID         -  HV1877
 HV1877  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1877  COUNTRY     -  US
 HV1877  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1877
 HV1877                         *CURRENT SURVEY CONTROL
 HV1877  ______________________________________________________________________
 HV1877* NAD 83(1986) POSITION- 38 54 15.     (N) 077 04 10.     (W)   SCALED
 HV1877* NAVD 88 ORTHO HEIGHT -     9.376 (meters)       30.76  (feet) ADJUSTED
 HV1877  ______________________________________________________________________
 HV1877  GEOID HEIGHT    -        -32.017 (meters)                     GEOID18
 HV1877  DYNAMIC HEIGHT  -          9.371 (meters)       30.74  (feet) COMP
 HV1877  MODELED GRAVITY -    980,092.2   (mgal)                       NAVD 88
 HV1877
 HV1877  VERT ORDER      -  FIRST     CLASS II
 HV1877
 HV1877.The horizontal coordinates were scaled from a map and have
 HV1877.an estimated accuracy of +/- 6 seconds.
 HV1877
 HV1877.The orthometric height was determined by differential leveling and
 HV1877.adjusted by the NATIONAL GEODETIC SURVEY
 HV1877.in June 1991.
 HV1877
 HV1877.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1877.GEOID18 height accuracy estimate available here.
 HV1877
 HV1877.Click photographs - Photos may exist for this station.
 HV1877
 HV1877.The dynamic height is computed by dividing the NAVD 88
 HV1877.geopotential number by the normal gravity value computed on the
 HV1877.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1877.degrees latitude (g = 980.6199 gals.).
 HV1877
 HV1877.The modeled gravity was interpolated from observed gravity values.
 HV1877
 HV1877
 HV1877_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ205081(NAD 83)
 HV1877
 HV1877                          SUPERSEDED SURVEY CONTROL
 HV1877
 HV1877  NGVD 29 (11/26/84)    9.606  (m)           31.52   (f) ADJUSTED    1 2
 HV1877
 HV1877.Superseded values are not recommended for survey control.
 HV1877
 HV1877.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1877.See file dsdata.pdf to determine how the superseded data were derived.
 HV1877
 HV1877_MARKER: O = CHISELED CIRCLE
 HV1877_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1877_SP_SET: WATER TABLE
 HV1877_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1877
 HV1877  HISTORY     - Date     Condition        Report By
 HV1877  HISTORY     - 1894     MONUMENTED       CGS
 HV1877  HISTORY     - 1926     GOOD             CGS
 HV1877  HISTORY     - 1935     GOOD             CGS
 HV1877
 HV1877                          STATION DESCRIPTION
 HV1877
 HV1877'DESCRIBED BY COAST AND GEODETIC SURVEY 1926
 HV1877'AT WASHINGTON.
 HV1877'AT WASHINGTON, ON K STREET NORTHWEST, WEST OF KEY BRIODGE, AT A
 HV1877'STONE ARCH OVER THE STREET (THE ONLY REMAINS OF THE OLD AQUEDUCT
 HV1877'BRIDGE), AT THE WEST WING WALL OF THE NORTH ABUTMENT, ON THE
 HV1877'WATER TABLE BELOW THE FORMER CANAL LEVEL, 11 FEET FROM THE WEST
 HV1877'END OF THE WING WALL, AND ABOUT 7 FEET BELOW THE TOP OF THE WALL.
 HV1877'THE BOTTOM OF A SQUARE HOLE.
 HV1877
 HV1877                          STATION RECOVERY (1935)
 HV1877
 HV1877'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935
 HV1877'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1398 ***********************************************************************
 HV1398  DESIGNATION -  Y
 HV1398  PID         -  HV1398
 HV1398  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1398  COUNTRY     -  US
 HV1398  USGS QUAD   -  ANACOSTIA (2016)
 HV1398
 HV1398                         *CURRENT SURVEY CONTROL
 HV1398  ______________________________________________________________________
 HV1398* NAD 83(1986) POSITION- 38 52 20.92   (N) 076 59 44.92   (W)   HD_HELD1
 HV1398* NAVD 88 ORTHO HEIGHT -     2.440 (meters)        8.01  (feet) ADJUSTED
 HV1398  ______________________________________________________________________
 HV1398  GEOID HEIGHT    -        -32.183 (meters)                     GEOID18
 HV1398  DYNAMIC HEIGHT  -          2.438 (meters)        8.00  (feet) COMP
 HV1398  MODELED GRAVITY -    980,096.3   (mgal)                       NAVD 88
 HV1398
 HV1398  VERT ORDER      -  FIRST     CLASS II
 HV1398
 HV1398.The horizontal coordinates were determined by differentially corrected
 HV1398.hand held GPS observations or other comparable positioning techniques
 HV1398.and have an estimated accuracy of +/- 3 meters.
 HV1398
 HV1398.The orthometric height was determined by differential leveling and
 HV1398.adjusted by the NATIONAL GEODETIC SURVEY
 HV1398.in June 1991.
 HV1398
 HV1398.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1398.GEOID18 height accuracy estimate available here.
 HV1398
 HV1398.Click photographs - Photos may exist for this station.
 HV1398
 HV1398.The dynamic height is computed by dividing the NAVD 88
 HV1398.geopotential number by the normal gravity value computed on the
 HV1398.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1398.degrees latitude (g = 980.6199 gals.).
 HV1398
 HV1398.The modeled gravity was interpolated from observed gravity values.
 HV1398
 HV1398
 HV1398_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2686104518(NAD 83)
 HV1398
 HV1398                          SUPERSEDED SURVEY CONTROL
 HV1398
 HV1398  NGVD 29 (11/26/84)    2.687  (m)            8.82   (f) ADJUSTED    1 2
 HV1398
 HV1398.Superseded values are not recommended for survey control.
 HV1398
 HV1398.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1398.See file dsdata.pdf to determine how the superseded data were derived.
 HV1398
 HV1398_MARKER: DB = BENCH MARK DISK
 HV1398_SETTING: 35 = SET IN A MAT FOUNDATION OR CONCRETE SLAB OTHER THAN
 HV1398+WITH SETTING: PAVEMENT
 HV1398_SP_SET: TOWER FOOTING
 HV1398_STAMPING: Y
 HV1398_MARK LOGO: CGS
 HV1398_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV1398+STABILITY: SURFACE MOTION
 HV1398_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1398+SATELLITE: SATELLITE OBSERVATIONS - July 15, 2019
 HV1398
 HV1398  HISTORY     - Date     Condition        Report By
 HV1398  HISTORY     - UNK      MONUMENTED       CGS
 HV1398  HISTORY     - 1923     GOOD             CGS
 HV1398  HISTORY     - 1955     GOOD             CGS
 HV1398  HISTORY     - 20051210 GOOD             GEOCAC
 HV1398  HISTORY     - 20120315 GOOD             GEOCAC
 HV1398  HISTORY     - 20190715 GOOD             USPSQD
 HV1398
 HV1398                          STATION DESCRIPTION
 HV1398
 HV1398'DESCRIBED BY COAST AND GEODETIC SURVEY 1923
 HV1398'IN WASHINGTON.
 HV1398'IN SOUTHEAST WASHINGTON, ON THE GROUNDS OF THE NAVAL GUN FACTORY,
 HV1398'AT THE INTERSECTION OF SICARD AND PAULDING STREETS, AT THE NORTHEAST
 HV1398'CORNER OF WILLARD PARK, AND ON THE TOP OF THE SOUTH SIDE OF A
 HV1398'42-INCH SQUARE BLOCK FORMERLY A TOWER FOOTING.  A STANDARD DISK,
 HV1398'STAMPED Y.
 HV1398
 HV1398                          STATION RECOVERY (1955)
 HV1398
 HV1398'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955
 HV1398'RECOVERED IN GOOD CONDITION.
 HV1398
 HV1398                          STATION RECOVERY (2005)
 HV1398
 HV1398'RECOVERY NOTE BY GEOCACHING 2005 (KPS)
 HV1398'FOUND BY ACCIDENT IN THE STONE BASE OF A SUN DIAL IN THE WATERFRONT
 HV1398'PARK AT WASHINGTON NAVY YARD, IN FRONT OF THE NAVAL HISTORY MUSEUM.
 HV1398
 HV1398                          STATION RECOVERY (2012)
 HV1398
 HV1398'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV1398'RECOVERED IN GOOD CONDITION.
 HV1398
 HV1398                          STATION RECOVERY (2019)
 HV1398
 HV1398'RECOVERY NOTE BY US POWER SQUADRON 2019 (RJS)
 HV1398'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1971 ***********************************************************************
 HV1971  DESIGNATION -  Y 1
 HV1971  PID         -  HV1971
 HV1971  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1971  COUNTRY     -  US
 HV1971  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1971
 HV1971                         *CURRENT SURVEY CONTROL
 HV1971  ______________________________________________________________________
 HV1971* NAD 83(1986) POSITION- 38 54 20.     (N) 077 00 10.     (W)   SCALED
 HV1971* NAVD 88 ORTHO HEIGHT -    19.402 (meters)       63.65  (feet) ADJUSTED
 HV1971  ______________________________________________________________________
 HV1971  GEOID HEIGHT    -        -32.106 (meters)                     GEOID18
 HV1971  DYNAMIC HEIGHT  -         19.392 (meters)       63.62  (feet) COMP
 HV1971  MODELED GRAVITY -    980,105.8   (mgal)                       NAVD 88
 HV1971
 HV1971  VERT ORDER      -  FIRST     CLASS I
 HV1971
 HV1971.The horizontal coordinates were scaled from a map and have
 HV1971.an estimated accuracy of +/- 6 seconds.
 HV1971
 HV1971.The orthometric height was determined by differential leveling and
 HV1971.adjusted by the NATIONAL GEODETIC SURVEY
 HV1971.in June 1991.
 HV1971
 HV1971.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1971.GEOID18 height accuracy estimate available here.
 HV1971
 HV1971.Click photographs - Photos may exist for this station.
 HV1971
 HV1971.The dynamic height is computed by dividing the NAVD 88
 HV1971.geopotential number by the normal gravity value computed on the
 HV1971.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1971.degrees latitude (g = 980.6199 gals.).
 HV1971
 HV1971.The modeled gravity was interpolated from observed gravity values.
 HV1971
 HV1971
 HV1971_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ263082(NAD 83)
 HV1971
 HV1971                          SUPERSEDED SURVEY CONTROL
 HV1971
 HV1971  NGVD 29 (11/26/84)   19.632  (m)           64.41   (f) ADJUSTED    1 1
 HV1971
 HV1971.Superseded values are not recommended for survey control.
 HV1971
 HV1971.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1971.See file dsdata.pdf to determine how the superseded data were derived.
 HV1971
 HV1971_MARKER: DB = BENCH MARK DISK
 HV1971_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1971_SP_SET: BRIDGE WALL
 HV1971_STAMPING: Y 1 1933
 HV1971_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1971
 HV1971  HISTORY     - Date     Condition        Report By
 HV1971  HISTORY     - 1933     MONUMENTED       CGS
 HV1971  HISTORY     - 1971     GOOD             NGS
 HV1971  HISTORY     - 1978     GOOD             DMA
 HV1971  HISTORY     - 1979     GOOD             NGS
 HV1971
 HV1971                          STATION DESCRIPTION
 HV1971
 HV1971'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1971'AT WASHINGTON.
 HV1971'AT WASHINGTON, D.C., AT THE NORTHEAST CORNER OF THE BALTIMORE
 HV1971'AND OHIO RAILROAD OVERPASS FOR M STREET, SET IN THE TOP OF THE
 HV1971'STONE RETAINING WALL, 1.5 FEET SOUTH OF THE NORTH END OF THE WALL,
 HV1971'3 1/2 FEET EAST OF THE EAST RAIL OF THE MOST EASTERLY TRACK, AND
 HV1971'ABOUT LEVEL WITH THE TRACKS.
 HV1971
 HV1971                          STATION RECOVERY (1978)
 HV1971
 HV1971'RECOVERY NOTE BY DEFENSE MAP AGENCY 1978
 HV1971'RECOVERED IN GOOD CONDITION.
 HV1971
 HV1971                          STATION RECOVERY (1979)
 HV1971
 HV1971'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1971'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8038 ***********************************************************************
 HV8038  DESIGNATION -  Y 2
 HV8038  PID         -  HV8038
 HV8038  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8038  COUNTRY     -  US
 HV8038  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8038
 HV8038                         *CURRENT SURVEY CONTROL
 HV8038  ______________________________________________________________________
 HV8038* NAD 83(1986) POSITION- 38 53 53.     (N) 077 02 08.     (W)   SCALED
 HV8038* NAVD 88 ORTHO HEIGHT -    18.084 (meters)       59.33  (feet) ADJUSTED
 HV8038  ______________________________________________________________________
 HV8038  GEOID HEIGHT    -        -32.070 (meters)                     GEOID18
 HV8038  DYNAMIC HEIGHT  -         18.074 (meters)       59.30  (feet) COMP
 HV8038  MODELED GRAVITY -    980,098.0   (mgal)                       NAVD 88
 HV8038
 HV8038  VERT ORDER      -  FIRST     CLASS 0
 HV8038
 HV8038.The horizontal coordinates were scaled from a map and have
 HV8038.an estimated accuracy of +/- 6 seconds.
 HV8038
 HV8038.The orthometric height was determined by differential leveling and
 HV8038.adjusted by the NATIONAL GEODETIC SURVEY
 HV8038.in June 1991.
 HV8038
 HV8038.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8038.GEOID18 height accuracy estimate available here.
 HV8038
 HV8038.Click photographs - Photos may exist for this station.
 HV8038
 HV8038.The dynamic height is computed by dividing the NAVD 88
 HV8038.geopotential number by the normal gravity value computed on the
 HV8038.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8038.degrees latitude (g = 980.6199 gals.).
 HV8038
 HV8038.The modeled gravity was interpolated from observed gravity values.
 HV8038
 HV8038
 HV8038_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234074(NAD 83)
 HV8038
 HV8038                          SUPERSEDED SURVEY CONTROL
 HV8038
 HV8038  NGVD 29 (??/??/92)   18.319  (m)           60.10   (f) ADJ UNCH    1 0
 HV8038
 HV8038.Superseded values are not recommended for survey control.
 HV8038
 HV8038.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8038.See file dsdata.pdf to determine how the superseded data were derived.
 HV8038
 HV8038_MARKER: DB = BENCH MARK DISK
 HV8038_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV8038_STAMPING: Y 2 1949
 HV8038_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV8038+STABILITY: SURFACE MOTION
 HV8038
 HV8038  HISTORY     - Date     Condition        Report By
 HV8038  HISTORY     - 1949     MONUMENTED       CGS
 HV8038
 HV8038                          STATION DESCRIPTION
 HV8038
 HV8038'DESCRIBED BY COAST AND GEODETIC SURVEY 1949
 HV8038'IN WASHINGTON DC.
 HV8038'AT WASHINGTON, D.C. ON THE WHITE HOUSE GROUNDS, ABOUT 150 FEET N 10
 HV8038'DEGREE WEST FROM THE NORTHWEST CORNER OF THE WHITE HOUSE, 107.7 FEET
 HV8038'EAST OF BENCH MARK X 2 1949, 62.2 FEET SOUTH-SOUTHWEST OF THE CENTER
 HV8038'OF A 26-INCH (1952) TREE WHICH IS NORTHWEST OF A LARGE CLUMP OF
 HV8038'FORSYTHIA, 39.8 FEET NORTHWEST OF A 24-INCH (1952) TREE, 35.6 FEET
 HV8038'EAST-SOUTHEAST OF THE CENTER OF A RECTANGULAR (7- BY 9-INCH)
 HV8038'CAST-IRON COVER MARKED 'MUELLER SPRINKLER AND FLUSHING HYDRANT', AND
 HV8038'ABOUT FLUSH WITH THE SURFACE OF THE GROUND, A BRASS DISK, STAMPED 'Y
 HV8038'2 1949' AND SET IN THE TOP OF A CONCRETE POST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV7972 ***********************************************************************
 HV7972  DESIGNATION -  Y RESET
 HV7972  PID         -  HV7972
 HV7972  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV7972  COUNTRY     -  US
 HV7972  USGS QUAD   -  ANACOSTIA (2016)
 HV7972
 HV7972                         *CURRENT SURVEY CONTROL
 HV7972  ______________________________________________________________________
 HV7972* NAD 83(1986) POSITION- 38 52 23.0    (N) 076 59 46.6    (W)   HD_HELD2
 HV7972* NAVD 88 ORTHO HEIGHT -     2.123 (meters)        6.97  (feet) ADJUSTED
 HV7972  ______________________________________________________________________
 HV7972  GEOID HEIGHT    -        -32.182 (meters)                     GEOID18
 HV7972  DYNAMIC HEIGHT  -          2.121 (meters)        6.96  (feet) COMP
 HV7972  MODELED GRAVITY -    980,096.3   (mgal)                       NAVD 88
 HV7972
 HV7972  VERT ORDER      -  SECOND    CLASS I
 HV7972
 HV7972.The horizontal coordinates were established by autonomous hand held GPS
 HV7972.observations and have an estimated accuracy of +/- 10 meters.
 HV7972
 HV7972.The orthometric height was determined by differential leveling and
 HV7972.adjusted by the NATIONAL GEODETIC SURVEY
 HV7972.in October 2001.
 HV7972
 HV7972.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV7972.GEOID18 height accuracy estimate available here.
 HV7972
 HV7972.Click photographs - Photos may exist for this station.
 HV7972
 HV7972.The dynamic height is computed by dividing the NAVD 88
 HV7972.geopotential number by the normal gravity value computed on the
 HV7972.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV7972.degrees latitude (g = 980.6199 gals.).
 HV7972
 HV7972.The modeled gravity was interpolated from observed gravity values.
 HV7972
 HV7972
 HV7972_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2682204583(NAD 83)
 HV7972
 HV7972                          SUPERSEDED SURVEY CONTROL
 HV7972
 HV7972  NGVD 29 (??/??/??)    2.36   (m)            7.7    (f) RESET       3  
 HV7972
 HV7972.Superseded values are not recommended for survey control.
 HV7972
 HV7972.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV7972.See file dsdata.pdf to determine how the superseded data were derived.
 HV7972
 HV7972_MARKER: DV = VERTICAL CONTROL DISK
 HV7972_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 HV7972_SP_SET: DOOR SILL
 HV7972_STAMPING: Y RESET 1980
 HV7972_MARK LOGO: NGS
 HV7972_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV7972_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV7972_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV7972+SATELLITE: SATELLITE OBSERVATIONS - July 15, 2019
 HV7972
 HV7972  HISTORY     - Date     Condition        Report By
 HV7972  HISTORY     - 1980     MONUMENTED       NGS
 HV7972  HISTORY     - 19950811 GOOD             USPSQD
 HV7972  HISTORY     - 20010716 GOOD             NGS
 HV7972  HISTORY     - 20120315 GOOD             GEOCAC
 HV7972  HISTORY     - 20190715 GOOD             USPSQD
 HV7972
 HV7972                          STATION DESCRIPTION
 HV7972
 HV7972'DESCRIBED BY NATIONAL GEODETIC SURVEY 1980
 HV7972'IN WASHINGTON.
 HV7972'LOCATED JUST OPPOSITE WILLARD PARK AT THE WASHINGTON NAVY YARD, AT
 HV7972'THE EAST ENTRANCE TO THE BASE CHAPEL, ABOUT 50 YDS WEST OF THE MUSEUM
 HV7972'50 YARDS WEST OF PAULING STREET, 72 FEET EAST OF THE CENTER OF A
 HV7972'NORTH SOUTH STREET, 34.5 FEET NORTH OF THE CENTER OF SICARD STREET
 HV7972'AND 4 FEET SOUTH OF THE CENTER OF THE CHAPEL DOOR AND ABOUT 0.5 FOOT
 HV7972'NORTH OF THE SOUTH EDGE OF THE DOOR. THIS BUILDING HAS A NAVY NUMBER 1
 HV7972
 HV7972                          STATION RECOVERY (1995)
 HV7972
 HV7972'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV7972'RECOVERED IN GOOD CONDITION.
 HV7972
 HV7972                          STATION RECOVERY (2001)
 HV7972
 HV7972'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 HV7972'RECOVERED AS DESCRIBED.
 HV7972
 HV7972                          STATION RECOVERY (2012)
 HV7972
 HV7972'RECOVERY NOTE BY GEOCACHING 2012 (LPC)
 HV7972'RECOVERED IN GOOD CONDITION.
 HV7972
 HV7972                          STATION RECOVERY (2019)
 HV7972
 HV7972'RECOVERY NOTE BY US POWER SQUADRON 2019 (RJS)
 HV7972'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AJ5410 ***********************************************************************
 AJ5410  DESIGNATION -  Y RESET
 AJ5410  PID         -  AJ5410
 AJ5410  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AJ5410  COUNTRY     -  US
 AJ5410  USGS QUAD   -  ANACOSTIA (2016)
 AJ5410
 AJ5410                         *CURRENT SURVEY CONTROL
 AJ5410  ______________________________________________________________________
 AJ5410* NAD 83(1986) POSITION- 38 52 28.     (N) 076 59 38.     (W)   SCALED
 AJ5410* NAVD 88 ORTHO HEIGHT -     2.553 (meters)        8.38  (feet) ADJUSTED
 AJ5410  ______________________________________________________________________
 AJ5410  GEOID HEIGHT    -        -32.183 (meters)                     GEOID18
 AJ5410  DYNAMIC HEIGHT  -          2.552 (meters)        8.37  (feet) COMP
 AJ5410  MODELED GRAVITY -    980,096.2   (mgal)                       NAVD 88
 AJ5410
 AJ5410  VERT ORDER      -  SECOND    CLASS I
 AJ5410
 AJ5410.The horizontal coordinates were scaled from a map and have
 AJ5410.an estimated accuracy of +/- 6 seconds.
 AJ5410
 AJ5410.The orthometric height was determined by differential leveling and
 AJ5410.adjusted by the NATIONAL GEODETIC SURVEY
 AJ5410.in October 2001.
 AJ5410
 AJ5410.Significant digits in the geoid height do not necessarily reflect accuracy.
 AJ5410.GEOID18 height accuracy estimate available here.
 AJ5410
 AJ5410.Click photographs - Photos may exist for this station.
 AJ5410
 AJ5410.The dynamic height is computed by dividing the NAVD 88
 AJ5410.geopotential number by the normal gravity value computed on the
 AJ5410.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 AJ5410.degrees latitude (g = 980.6199 gals.).
 AJ5410
 AJ5410.The modeled gravity was interpolated from observed gravity values.
 AJ5410
 AJ5410
 AJ5410_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ270047(NAD 83)
 AJ5410
 AJ5410                          SUPERSEDED SURVEY CONTROL
 AJ5410
 AJ5410.No superseded survey control is available for this station.
 AJ5410
 AJ5410_MARKER: DB = BENCH MARK DISK
 AJ5410_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 AJ5410_SP_SET: SUNDIAL FOUNDATION
 AJ5410_STAMPING: Y
 AJ5410_MARK LOGO: CGS
 AJ5410_MAGNETIC: N = NO MAGNETIC MATERIAL
 AJ5410_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 AJ5410
 AJ5410  HISTORY     - Date     Condition        Report By
 AJ5410  HISTORY     - 2000     MONUMENTED       NONE
 AJ5410  HISTORY     - 20010716 GOOD             NGS
 AJ5410
 AJ5410                          STATION DESCRIPTION
 AJ5410
 AJ5410'DESCRIBED BY NATIONAL GEODETIC SURVEY 2001 (RWA)
 AJ5410'IN SOUTHEAST WASHINGTON, ON THE NAVY YARD GROUNDS, AT THE INTERSECTION
 AJ5410'OF SICARD AND PAULDING STREETS, AT THE SOUTHEAST SIDE OF ADMIRAL
 AJ5410'WILLARD PARK, AT THE SOUTHEAST END OF A Y FORMED SIDEWALK, AND WEST OF
 AJ5410'A PARKING LOT, IN TOP OF THE WEST SIDE OF A SQUARE BLOCK SUPPORTING A
 AJ5410'SUNDIAL.  NOTE--IT WAS REPORTED THE WHOLE BLOCK AND SUNDIAL WITH THE
 AJ5410'BENCH MARK WERE MOVED TO ITS PRESENT LOCATION IN THE YEAR 2000.  MARK
 AJ5410'SHOULD BE CONSIDERED A RESET MARK ALTHOUGH NOT STAMPED RESET.  A NEW
 AJ5410'ELEVATION WILL BE GIVEN IN THE LEVELING OF 2001.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4378 ***********************************************************************
 HV4378  DESIGNATION -  YELLOW HOUSE RED ROOF CHIMNEY
 HV4378  PID         -  HV4378
 HV4378  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4378  COUNTRY     -  US
 HV4378  USGS QUAD   -  WASHINGTON WEST (2016)
 HV4378
 HV4378                         *CURRENT SURVEY CONTROL
 HV4378  ______________________________________________________________________
 HV4378* NAD 83(1993) POSITION- 38 54 21.00704(N) 077 04 59.77871(W)   ADJUSTED
 HV4378  ______________________________________________________________________
 HV4378  GEOID HEIGHT    -        -31.993 (meters)                     GEOID18
 HV4378  LAPLACE CORR    -         -2.74  (seconds)                    DEFLEC18
 HV4378  HORZ ORDER      -  THIRD
 HV4378
 HV4378.The horizontal coordinates were established by classical geodetic methods
 HV4378.and adjusted by the National Geodetic Survey in November 1994.
 HV4378
 HV4378.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4378.GEOID18 height accuracy estimate available here.
 HV4378
 HV4378.Click photographs - Photos may exist for this station.
 HV4378
 HV4378.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4378
 HV4378. The following values were computed from the NAD 83(1993) position.
 HV4378
 HV4378;                    North         East     Units Scale Factor Converg.
 HV4378;SPC MD       -   137,556.360   392,777.269   MT  0.99994998   -0 03 08.2
 HV4378;SPC MD       -   451,299.49  1,288,636.76   sFT  0.99994998   -0 03 08.2
 HV4378;SPC VA N     - 2,138,496.098 3,622,878.899   MT  0.99996102   +0 53 03.1
 HV4378;SPC VA N     - 7,016,049.28 11,886,061.85   sFT  0.99996102   +0 53 03.1
 HV4378;UTM  18      - 4,308,390.143   319,358.479   MT  1.00000183   -1 18 31.5
 HV4378
 HV4378_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ1935808390(NAD 83)
 HV4378
 HV4378                          SUPERSEDED SURVEY CONTROL
 HV4378
 HV4378  NAD 83(1991)-  38 54 21.00582(N)    077 04 59.78032(W) AD(       ) 3
 HV4378  NAD 83(1986)-  38 54 21.00560(N)    077 04 59.79023(W) AD(       ) 3
 HV4378  NAD 27      -  38 54 20.60600(N)    077 05 00.86200(W) AD(       ) 3
 HV4378
 HV4378.Superseded values are not recommended for survey control.
 HV4378
 HV4378.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4378.See file dsdata.pdf to determine how the superseded data were derived.
 HV4378
 HV4378_MARKER: 85 = CHIMNEY
 HV4378
 HV4378  HISTORY     - Date     Condition        Report By
 HV4378  HISTORY     - 1925     FIRST OBSERVED   CGS
 HV4378  HISTORY     - 19950617 GOOD             USPSQD
 HV4378
 HV4378                          STATION DESCRIPTION
 HV4378
 HV4378'DESCRIBED BY COAST AND GEODETIC SURVEY 1925 (GLB)
 HV4378'THIS INTERSECTION STATION IS THE SW CORNER OF A BRICK CHIMNEY ON
 HV4378'A RED ROOFED YELLOW HOUSE ABOUT 1/2 MILE W OF THE N END OF KEY
 HV4378'BRIDGE.  IT IS THE SE ONE OF TWO CHIMNEYS ON THE SAME ROOF.
 HV4378'IT IS VERY CLOSE TO THE POINT ESTABLISHED BY C.B. FRENCH IN
 HV4378'1913 AND DESCRIBED AS A CHIMNEY ON A RED ROOFED WHITE HOUSE.
 HV4378
 HV4378                          STATION RECOVERY (1995)
 HV4378
 HV4378'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV4378'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1979 ***********************************************************************
 HV1979  TIDAL BM    -  This is a Tidal Bench Mark.
 HV1979  DESIGNATION -  Z
 HV1979  PID         -  HV1979
 HV1979  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1979  COUNTRY     -  US
 HV1979  USGS QUAD   -  ALEXANDRIA (2019)
 HV1979
 HV1979                         *CURRENT SURVEY CONTROL
 HV1979  ______________________________________________________________________
 HV1979* NAD 83(1986) POSITION- 38 52 19.0    (N) 077 01 02.7    (W)   HD_HELD2
 HV1979* NAVD 88 ORTHO HEIGHT -     6.601 (meters)       21.66  (feet) ADJUSTED
 HV1979  ______________________________________________________________________
 HV1979  GEOID HEIGHT    -        -32.149 (meters)                     GEOID18
 HV1979  DYNAMIC HEIGHT  -          6.598 (meters)       21.65  (feet) COMP
 HV1979  MODELED GRAVITY -    980,096.9   (mgal)                       NAVD 88
 HV1979
 HV1979  VERT ORDER      -  FIRST     CLASS I
 HV1979
 HV1979.The horizontal coordinates were established by autonomous hand held GPS
 HV1979.observations and have an estimated accuracy of +/- 10 meters.
 HV1979
 HV1979.The orthometric height was determined by differential leveling and
 HV1979.adjusted by the NATIONAL GEODETIC SURVEY
 HV1979.in June 1991.
 HV1979
 HV1979.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1979.GEOID18 height accuracy estimate available here.
 HV1979
 HV1979.This Tidal Bench Mark is designated as VM 14009
 HV1979.by the CENTER FOR OPERATIONAL OCEANOGRAPHIC PRODUCTS AND SERVICES.
 HV1979
 HV1979.Click photographs - Photos may exist for this station.
 HV1979
 HV1979.The dynamic height is computed by dividing the NAVD 88
 HV1979.geopotential number by the normal gravity value computed on the
 HV1979.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1979.degrees latitude (g = 980.6199 gals.).
 HV1979
 HV1979.The modeled gravity was interpolated from observed gravity values.
 HV1979
 HV1979
 HV1979_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2498604500(NAD 83)
 HV1979
 HV1979                          SUPERSEDED SURVEY CONTROL
 HV1979
 HV1979  NGVD 29 (08/12/92)    6.838  (m)           22.43   (f) ADJUSTED    1 1
 HV1979  NGVD 29 (??/??/87)    6.838  (m)           22.43   (f) SUPERSEDED  1 1
 HV1979
 HV1979.Superseded values are not recommended for survey control.
 HV1979
 HV1979.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1979.See file dsdata.pdf to determine how the superseded data were derived.
 HV1979
 HV1979_MARKER: DB = BENCH MARK DISK
 HV1979_SETTING: 40 = SET IN A LARGE STRUCTURE WITH DEEP FOUNDATIONS
 HV1979_SP_SET: BUILDING
 HV1979_STAMPING: Z 1923
 HV1979_MARK LOGO: CGS
 HV1979_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1979_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD
 HV1979+STABILITY: POSITION/ELEVATION WELL
 HV1979_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1979+SATELLITE: SATELLITE OBSERVATIONS - May 13, 1992
 HV1979
 HV1979  HISTORY     - Date     Condition        Report By
 HV1979  HISTORY     - 1923     MONUMENTED       CGS
 HV1979  HISTORY     - 1972     GOOD             NGS
 HV1979  HISTORY     - 19920513 GOOD             NGS
 HV1979  HISTORY     - 20100314 GOOD             GEOCAC
 HV1979
 HV1979                          STATION DESCRIPTION
 HV1979
 HV1979'DESCRIBED BY NATIONAL GEODETIC SURVEY 1972
 HV1979'AT WASHINGTON DC.
 HV1979'AT WASHINGTON, D.C., AT THE JUNCTION OF SW P AND SW 4TH STREETS,
 HV1979'AT THE HEADQUARTER BUILDING FOR U.S. ARMY FORT LESLEY J. MC NAIR
 HV1979'MILITARY DISTRICT OF WASHINGTON, D.C. (A THREE-STORIED BRICK
 HV1979'BUILDING) SET IN TOP OF THE WATER TABLE ON THE NORTH SIDE OF THE
 HV1979'BUILDING, 42.5 FEET WEST OF THE NORTHEAST CORNER OF THE BUILDING,
 HV1979'43 FEET EAST OF THE EXTENDED CENTER LINE OF SW 4TH STREET, 23
 HV1979'FEET SOUTH OF THE SOUTH CURB OF SW P STREET, AND 3.8 FEET ABOVE
 HV1979'THE LEVEL OF THE GROUND.
 HV1979
 HV1979                          STATION RECOVERY (1992)
 HV1979
 HV1979'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1979'IN WASHINGTON, D.C., AT THE INTERSECTION OF SOUTHWEST P AND SOUTHWEST
 HV1979'4TH STREETS, IN TOP OF THE WATER TABLE ALONG THE NORTH SIDE OF THE
 HV1979'FORT LESLEY J. MCNAIR HEADQUARTERS, 13.0 M (42.7 FT) WEST OF THE
 HV1979'NORTHEAST CORNER OF THE BUILDING, 13.0 M (42.7 FT) EAST OF THE
 HV1979'EXTENDED CENTER OF 4TH STREET, 7.1 M (23.3 FT) SOUTH OF THE SOUTH
 HV1979'CURB OF P STREET, AND 1.2 M (3.9 FT) ABOVE THE LEVEL OF THE STREETS.
 HV1979
 HV1979                          STATION RECOVERY (2010)
 HV1979
 HV1979'RECOVERY NOTE BY GEOCACHING 2010 (LPC)
 HV1979'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1972 ***********************************************************************
 HV1972  DESIGNATION -  Z 1
 HV1972  PID         -  HV1972
 HV1972  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1972  COUNTRY     -  US
 HV1972  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1972
 HV1972                         *CURRENT SURVEY CONTROL
 HV1972  ______________________________________________________________________
 HV1972* NAD 83(1986) POSITION- 38 54 36.     (N) 077 00 07.     (W)   SCALED
 HV1972* NAVD 88 ORTHO HEIGHT -    25.624 (meters)       84.07  (feet) ADJUSTED
 HV1972  ______________________________________________________________________
 HV1972  GEOID HEIGHT    -        -32.098 (meters)                     GEOID18
 HV1972  DYNAMIC HEIGHT  -         25.610 (meters)       84.02  (feet) COMP
 HV1972  MODELED GRAVITY -    980,106.4   (mgal)                       NAVD 88
 HV1972
 HV1972  VERT ORDER      -  FIRST     CLASS I
 HV1972
 HV1972.The horizontal coordinates were scaled from a map and have
 HV1972.an estimated accuracy of +/- 6 seconds.
 HV1972
 HV1972.The orthometric height was determined by differential leveling and
 HV1972.adjusted by the NATIONAL GEODETIC SURVEY
 HV1972.in June 1991.
 HV1972
 HV1972.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1972.GEOID18 height accuracy estimate available here.
 HV1972
 HV1972.Click photographs - Photos may exist for this station.
 HV1972
 HV1972.The dynamic height is computed by dividing the NAVD 88
 HV1972.geopotential number by the normal gravity value computed on the
 HV1972.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1972.degrees latitude (g = 980.6199 gals.).
 HV1972
 HV1972.The modeled gravity was interpolated from observed gravity values.
 HV1972
 HV1972
 HV1972_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ264086(NAD 83)
 HV1972
 HV1972                          SUPERSEDED SURVEY CONTROL
 HV1972
 HV1972  NGVD 29 (11/26/84)   25.853  (m)           84.82   (f) ADJUSTED    1 1
 HV1972
 HV1972.Superseded values are not recommended for survey control.
 HV1972
 HV1972.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1972.See file dsdata.pdf to determine how the superseded data were derived.
 HV1972
 HV1972_MARKER: DB = BENCH MARK DISK
 HV1972_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1972_SP_SET: PIER
 HV1972_STAMPING: Z 1 1933
 HV1972_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1972
 HV1972  HISTORY     - Date     Condition        Report By
 HV1972  HISTORY     - 1933     MONUMENTED       CGS
 HV1972  HISTORY     - 1971     GOOD             NGS
 HV1972  HISTORY     - 1978     GOOD             DMA
 HV1972  HISTORY     - 1979     GOOD             NGS
 HV1972
 HV1972                          STATION DESCRIPTION
 HV1972
 HV1972'DESCRIBED BY NATIONAL GEODETIC SURVEY 1971
 HV1972'AT WASHINGTON.
 HV1972'AT WASHINGTON, D.C., AT THE NEW YORK AVENUE OVERPASS FOR THE
 HV1972'BALTIMORE AND OHIO RAILROAD, SET IN THE CENTER OF THE TOP OF THE
 HV1972'MOST EASTERLY CONCRETE PIER AND DIRECTLY BELOW THE CENTER LINE
 HV1972'OF THE AVENUE, AND ABOUT 6 FEET ABOVE THE LEVEL OF THE TRACKS.
 HV1972
 HV1972                          STATION RECOVERY (1978)
 HV1972
 HV1972'RECOVERY NOTE BY DEFENSE MAP AGENCY 1978
 HV1972'SWITCH 93 NO LONGER THERE.
 HV1972
 HV1972                          STATION RECOVERY (1979)
 HV1972
 HV1972'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1972'RECOVERED IN GOOD CONDITION.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1903 ***********************************************************************
 HV1903  DESIGNATION -  Z 1
 HV1903  PID         -  HV1903
 HV1903  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1903  COUNTRY     -  US
 HV1903  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1903
 HV1903                         *CURRENT SURVEY CONTROL
 HV1903  ______________________________________________________________________
 HV1903* NAD 83(1986) POSITION- 38 56 35.0    (N) 077 03 24.2    (W)   HD_HELD1
 HV1903* NAVD 88 ORTHO HEIGHT -    90.65  (+/-2cm)      297.4   (feet) VERTCON3
 HV1903  ______________________________________________________________________
 HV1903  GEOID HEIGHT    -        -31.977 (meters)                     GEOID18
 HV1903  VERT ORDER      -  ? (See Below)
 HV1903
 HV1903.The horizontal coordinates were determined by differentially corrected
 HV1903.hand held GPS observations or other comparable positioning techniques
 HV1903.and have an estimated accuracy of +/- 3 meters.
 HV1903
 HV1903.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1903.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1903
 HV1903.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1903.GEOID18 height accuracy estimate available here.
 HV1903
 HV1903.The vertical order pertains to the NGVD 29 superseded value.
 HV1903
 HV1903.Click photographs - Photos may exist for this station.
 HV1903
 HV1903
 HV1903_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2175412468(NAD 83)
 HV1903
 HV1903                          SUPERSEDED SURVEY CONTROL
 HV1903
 HV1903  NGVD 29 (11/26/84)   90.872  (m)          298.14   (f) ADJUSTED       
 HV1903
 HV1903.Superseded values are not recommended for survey control.
 HV1903
 HV1903.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1903.See file dsdata.pdf to determine how the superseded data were derived.
 HV1903
 HV1903_MARKER: DB = BENCH MARK DISK
 HV1903_SETTING: 36 = SET IN A MASSIVE STRUCTURE
 HV1903_SP_SET: FOUNDATION
 HV1903_STAMPING: Z 1 1932
 HV1903_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
 HV1903_SATELLITE: THE SITE LOCATION WAS REPORTED AS NOT SUITABLE FOR
 HV1903+SATELLITE: SATELLITE OBSERVATIONS - August 06, 2005
 HV1903
 HV1903  HISTORY     - Date     Condition        Report By
 HV1903  HISTORY     - 1932     MONUMENTED       CGS
 HV1903  HISTORY     - 19950605 GOOD             USPSQD
 HV1903  HISTORY     - 19991005 GOOD             NGS
 HV1903  HISTORY     - 20050806 GOOD             GEOCAC
 HV1903
 HV1903                          STATION DESCRIPTION
 HV1903
 HV1903'DESCRIBED BY COAST AND GEODETIC SURVEY 1932
 HV1903'AT WASHINGTON.
 HV1903'AT WASHINGTON, AT 2801 UPTON STREET NORTHWEST, AT THE GEOPHYSICAL
 HV1903'LABORATORY OF THE CARNEGIE INSTITUTION OF WASHINGTON, AT THE
 HV1903'SOUTHWEST CORNER OF THE BUILDING, IN THE SOUTH FACE OF THE
 HV1903'FOUNDATION, 6 INCHES EAST OF THE CORNER, AND 3.5 FEET ABOVE
 HV1903'THE GROUND.  A STANDARD DISK, STAMPED Z 1 1932 AND SET VERTICALLY.
 HV1903
 HV1903                          STATION RECOVERY (1995)
 HV1903
 HV1903'RECOVERY NOTE BY US POWER SQUADRON 1995
 HV1903'RECOVERED IN GOOD CONDITION.
 HV1903
 HV1903                          STATION RECOVERY (1999)
 HV1903
 HV1903'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1999 (DW)
 HV1903'BLDG. IS NOW THE LEVINE SCHOOL OF MUSIC, SALLIE MAE HALL.
 HV1903
 HV1903                          STATION RECOVERY (2005)
 HV1903
 HV1903'RECOVERY NOTE BY GEOCACHING 2005 (APC)
 HV1903'FOUND AS DESCRIBED AND ACROSS PARKING LOT FROM ELEVATOR ENTRANCE.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1933 ***********************************************************************
 HV1933  DESIGNATION -  Z 1 PBPP
 HV1933  PID         -  HV1933
 HV1933  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1933  COUNTRY     -  US
 HV1933  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1933
 HV1933                         *CURRENT SURVEY CONTROL
 HV1933  ______________________________________________________________________
 HV1933* NAD 83(1986) POSITION- 38 55 38.     (N) 077 02 42.     (W)   SCALED
 HV1933* NAVD 88 ORTHO HEIGHT -    16.55  (+/-2cm)       54.3   (feet) VERTCON3
 HV1933  ______________________________________________________________________
 HV1933  GEOID HEIGHT    -        -32.011 (meters)                     GEOID18
 HV1933  VERT ORDER      -  FIRST     CLASS II (See Below)
 HV1933
 HV1933.The horizontal coordinates were scaled from a map and have
 HV1933.an estimated accuracy of +/- 6 seconds.
 HV1933
 HV1933.The NAVD 88 height was computed by applying the VERTCON shift value to
 HV1933.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
 HV1933
 HV1933.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1933.GEOID18 height accuracy estimate available here.
 HV1933
 HV1933.The vertical order pertains to the NGVD 29 superseded value.
 HV1933
 HV1933.Click photographs - Photos may exist for this station.
 HV1933
 HV1933
 HV1933_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ227106(NAD 83)
 HV1933
 HV1933                          SUPERSEDED SURVEY CONTROL
 HV1933
 HV1933  NGVD 29 (11/26/84)   16.784  (m)           55.07   (f) ADJUSTED    1 2
 HV1933
 HV1933.Superseded values are not recommended for survey control.
 HV1933
 HV1933.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1933.See file dsdata.pdf to determine how the superseded data were derived.
 HV1933
 HV1933_MARKER: DD = SURVEY DISK
 HV1933_SETTING: 30 = SET IN A LIGHT STRUCTURE
 HV1933_SP_SET: RAIL BASE
 HV1933_STAMPING: Z 1
 HV1933_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1933
 HV1933  HISTORY     - Date     Condition        Report By
 HV1933  HISTORY     - UNK      MONUMENTED       PBPP
 HV1933  HISTORY     - 1926     GOOD             PBPP
 HV1933  HISTORY     - 1944     GOOD             CGS
 HV1933  HISTORY     - 20081204 MARK NOT FOUND   AMTHOM
 HV1933
 HV1933                          STATION DESCRIPTION
 HV1933
 HV1933'DESCRIBED BY PUB BLDGS AND PARKS 1926
 HV1933'AT WASHINGTON.
 HV1933'AT WASHINGTON, AT THE HARVARD STREET ENTRANCE TO THE ZOOLOGICAL
 HV1933'PARK, AT THE NORTHWEST END OF THE BRIDGE OVER ROCK CREEK, IN THE
 HV1933'TOP OF THE BASE OF THE CONCRETE RAIL, 4.5 FEET FROM THE END
 HV1933'BLOCK, AND ABOUT 4 INCHES ABOVE THE SIDEWALK.  A PUBLIC BUILDINGS
 HV1933'AND PUBLIC PARKS STANDARD DISK, STAMPED Z 1.
 HV1933
 HV1933                          STATION RECOVERY (1944)
 HV1933
 HV1933'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944
 HV1933'RECOVERED IN GOOD CONDITION.
 HV1933
 HV1933                          STATION RECOVERY (2008)
 HV1933
 HV1933'RECOVERY NOTE BY A MORTON THOMAS AND ASSOCIATES 2008 (JAN)
 HV1933'CONCRETE RAIL NO LONGER EXISTS
 HV1933'STEEL PIPE RAIL NOW IN PLACE
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV8039 ***********************************************************************
 HV8039  DESIGNATION -  Z 2
 HV8039  PID         -  HV8039
 HV8039  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV8039  COUNTRY     -  US
 HV8039  USGS QUAD   -  WASHINGTON WEST (2016)
 HV8039
 HV8039                         *CURRENT SURVEY CONTROL
 HV8039  ______________________________________________________________________
 HV8039* NAD 83(1986) POSITION- 38 53 53.     (N) 077 02 08.     (W)   SCALED
 HV8039* NAVD 88 ORTHO HEIGHT -    17.966 (meters)       58.94  (feet) ADJUSTED
 HV8039  ______________________________________________________________________
 HV8039  GEOID HEIGHT    -        -32.070 (meters)                     GEOID18
 HV8039  DYNAMIC HEIGHT  -         17.956 (meters)       58.91  (feet) COMP
 HV8039  MODELED GRAVITY -    980,098.0   (mgal)                       NAVD 88
 HV8039
 HV8039  VERT ORDER      -  FIRST     CLASS 0
 HV8039
 HV8039.The horizontal coordinates were scaled from a map and have
 HV8039.an estimated accuracy of +/- 6 seconds.
 HV8039
 HV8039.The orthometric height was determined by differential leveling and
 HV8039.adjusted by the NATIONAL GEODETIC SURVEY
 HV8039.in June 1991.
 HV8039
 HV8039.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV8039.GEOID18 height accuracy estimate available here.
 HV8039
 HV8039.Click photographs - Photos may exist for this station.
 HV8039
 HV8039.The dynamic height is computed by dividing the NAVD 88
 HV8039.geopotential number by the normal gravity value computed on the
 HV8039.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV8039.degrees latitude (g = 980.6199 gals.).
 HV8039
 HV8039.The modeled gravity was interpolated from observed gravity values.
 HV8039
 HV8039
 HV8039_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ234074(NAD 83)
 HV8039
 HV8039                          SUPERSEDED SURVEY CONTROL
 HV8039
 HV8039  NGVD 29 (??/??/92)   18.200  (m)           59.71   (f) ADJ UNCH    1 0
 HV8039
 HV8039.Superseded values are not recommended for survey control.
 HV8039
 HV8039.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV8039.See file dsdata.pdf to determine how the superseded data were derived.
 HV8039
 HV8039_MARKER: DB = BENCH MARK DISK
 HV8039_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
 HV8039_STAMPING: Z 2 1949
 HV8039_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
 HV8039+STABILITY: SURFACE MOTION
 HV8039
 HV8039  HISTORY     - Date     Condition        Report By
 HV8039  HISTORY     - 1949     MONUMENTED       CGS
 HV8039
 HV8039                          STATION DESCRIPTION
 HV8039
 HV8039'DESCRIBED BY COAST AND GEODETIC SURVEY 1949
 HV8039'IN WASHINGTON DC.
 HV8039'AT WASHINGTON, D.C. ON THE WHITE HOUSE GROUNDS, ABOUT 150 FEET N 10
 HV8039'DEGREE EAST FROM THE NORTHEAST CORNER OF THE WHITE HOUSE, 62.9 FEET
 HV8039'EAST OF BENCH MARK Y 2 1949, 59.3 FEET NORTH OF THE CENTER OF THE
 HV8039'HYDRANT WHICH IS LOCATED AT THE NORTH EDGE OF THE DRIVEWAY AND
 HV8039'OPPOSITE THE STEPS, 19.4 FEET SOUTHWEST OF A 16-INCH (1952) TREE
 HV8039'HAVING AN ENLARGED BUTT, AND ABOUT FLUSH WITH THE SURFACE OF THE
 HV8039'GROUND. A BRASS DISK, STAMPED 'Z 2 1949' AND SET IN THE TOP OF A
 HV8039'CONCRETE POST.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV4720 ***********************************************************************
 HV4720  DESIGNATION -  Z USE 1913
 HV4720  PID         -  HV4720
 HV4720  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV4720  COUNTRY     -  US
 HV4720  USGS QUAD   -  ALEXANDRIA (2019)
 HV4720
 HV4720                         *CURRENT SURVEY CONTROL
 HV4720  ______________________________________________________________________
 HV4720* NAD 83(1993) POSITION- 38 51 25.59419(N) 077 01 18.41921(W)   ADJUSTED
 HV4720* NAVD 88 ORTHO HEIGHT -     2.    (meters)        7.    (feet) SCALED
 HV4720  ______________________________________________________________________
 HV4720  GEOID HEIGHT    -        -32.168 (meters)                     GEOID18
 HV4720  LAPLACE CORR    -         -2.91  (seconds)                    DEFLEC18
 HV4720  HORZ ORDER      -  THIRD
 HV4720
 HV4720.The horizontal coordinates were established by classical geodetic methods
 HV4720.and adjusted by the National Geodetic Survey in November 1994.
 HV4720
 HV4720.The orthometric height was scaled from a topographic map.
 HV4720
 HV4720.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV4720.GEOID18 height accuracy estimate available here.
 HV4720
 HV4720.Click photographs - Photos may exist for this station.
 HV4720
 HV4720.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV4720
 HV4720. The following values were computed from the NAD 83(1993) position.
 HV4720
 HV4720;                    North         East     Units Scale Factor Converg.
 HV4720;SPC MD       -   132,144.355   398,109.312   MT  0.99994990   -0 00 49.2
 HV4720;SPC MD       -   433,543.60  1,306,130.30   sFT  0.99994990   -0 00 49.2
 HV4720;SPC VA N     - 2,133,171.903 3,628,298.722   MT  0.99995711   +0 55 21.3
 HV4720;SPC VA N     - 6,998,581.49 11,903,843.39   sFT  0.99995711   +0 55 21.3
 HV4720;UTM  18      - 4,302,862.360   324,570.846   MT  0.99997898   -1 16 07.5
 HV4720
 HV4720!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV4720!SPC MD       -   1.00000477  x   0.99994990  =   0.99995467
 HV4720!SPC VA N     -   1.00000477  x   0.99995711  =   0.99996188
 HV4720!UTM  18      -   1.00000477  x   0.99997898  =   0.99998375
 HV4720
 HV4720_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2457002862(NAD 83)
 HV4720
 HV4720                          SUPERSEDED SURVEY CONTROL
 HV4720
 HV4720  NAD 83(1991)-  38 51 25.59272(N)    077 01 18.42054(W) AD(       ) 3
 HV4720  NAD 83(1986)-  38 51 25.59243(N)    077 01 18.43162(W) AD(       ) 3
 HV4720  NAD 27      -  38 51 25.19100(N)    077 01 19.51400(W) AD(       ) 3
 HV4720  USSD        -  38 51 25.71200(N)    077 01 18.57800(W) AD(       ) 3
 HV4720
 HV4720.Superseded values are not recommended for survey control.
 HV4720
 HV4720.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV4720.See file dsdata.pdf to determine how the superseded data were derived.
 HV4720
 HV4720_MARKER: H = DRILL HOLE
 HV4720_SETTING: 0 = UNSPECIFIED SETTING
 HV4720_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV4720
 HV4720  HISTORY     - Date     Condition        Report By
 HV4720  HISTORY     - 1913     MONUMENTED       USACE
 HV4720  HISTORY     - 1940     MARK NOT FOUND   CGS
 HV4720
 HV4720                          STATION DESCRIPTION
 HV4720
 HV4720'DESCRIBED BY US ARMY CORPS OF ENGINEERS 1913 (OBF)
 HV4720'STATION IS A DRILL HOLE IN THE SEA WALL A SHORT DISTANCE FROM
 HV4720'SOUTHEAST BASE AND ON HARBOR SIDE, DISTANT 43-1/2 METERS FROM SE
 HV4720'BASE.  A 3/4-INCH HOLE 1 INCH DEEP.
 HV4720
 HV4720                          STATION RECOVERY (1940)
 HV4720
 HV4720'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (TMP)
 HV4720'STATION LOST.  THE SEA WALL HAS BEEN COVERED OVER WITH A THICK
 HV4720'CONCRETE SIDEWALK.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 AI7409 ***********************************************************************
 AI7409  DESIGNATION -  ZERO MARK US NAVAL OBSERVATORY
 AI7409  PID         -  AI7409
 AI7409  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 AI7409  COUNTRY     -  US
 AI7409  USGS QUAD   -  WASHINGTON WEST (2016)
 AI7409
 AI7409                         *CURRENT SURVEY CONTROL
 AI7409  ______________________________________________________________________
 AI7409* NAD 83(1991) POSITION- 38 55 17.10686(N) 077 04 01.31723(W)   ADJUSTED
 AI7409* NAVD 88 ORTHO HEIGHT -    86.18  (meters)      282.7   (feet) LEVELING
 AI7409  ______________________________________________________________________
 AI7409  GEOID HEIGHT    -        -31.989 (meters)                     GEOID18
 AI7409  LAPLACE CORR    -         -2.98  (seconds)                    DEFLEC18
 AI7409  HORZ ORDER      -  SECOND
 AI7409  VERT ORDER      -  THIRD ?
 AI7409
 AI7409.The horizontal coordinates were established by classical geodetic methods
 AI7409.and adjusted by the National Geodetic Survey in August 2000.
 AI7409
 AI7409.The orthometric height was determined by differential leveling.
 AI7409.The vertical network tie was performed by a horz. field party for horz.
 AI7409.obs reductions. Reset procedures were used to establish the elevation.
 AI7409
 AI7409.Significant digits in the geoid height do not necessarily reflect accuracy.
 AI7409.GEOID18 height accuracy estimate available here.
 AI7409
 AI7409.Click photographs - Photos may exist for this station.
 AI7409
 AI7409.The Laplace correction was computed from DEFLEC18 derived deflections.
 AI7409
 AI7409. The following values were computed from the NAD 83(1991) position.
 AI7409
 AI7409;                    North         East     Units Scale Factor Converg.
 AI7409;UTM  18      - 4,310,087.604   320,805.937   MT  0.99999541   -1 17 56.3
 AI7409
 AI7409!             -  Elev Factor  x  Scale Factor =   Combined Factor
 AI7409!UTM  18      -   0.99999150  x   0.99999541  =   0.99998691
 AI7409
 AI7409_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2080510087(NAD 83)
 AI7409
 AI7409                          SUPERSEDED SURVEY CONTROL
 AI7409
 AI7409.No superseded survey control is available for this station.
 AI7409
 AI7409_MARKER: Z = SEE DESCRIPTION
 AI7409_SETTING: 31 = SET IN A PAVEMENT SUCH AS STREET, SIDEWALK, CURB, ETC.
 AI7409_SP_SET: FLOOR
 AI7409_STAMPING: ZERO MARK US NAVAL OBSERVATORY
 AI7409_MARK LOGO: NONE
 AI7409_MAGNETIC: N = NO MAGNETIC MATERIAL
 AI7409_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 AI7409
 AI7409  HISTORY     - Date     Condition        Report By
 AI7409  HISTORY     - UNK      MONUMENTED       NONE
 AI7409  HISTORY     - 20000125 GOOD             NGS
 AI7409
 AI7409                          STATION DESCRIPTION
 AI7409
 AI7409'DESCRIBED BY NATIONAL GEODETIC SURVEY 2000 (RWA)
 AI7409'2.75 MILES (4.43 KM) SOUTHEAST ALONG MASSACHUSETTS AVENUE FROM THE
 AI7409'INTERSECTION WITH WESTERN AVENUE AT WESTMORELAND CIRCLE AT THE
 AI7409'MARYLAND AND DISTRICT OF COLUMBIA STATE LINE TO THE INTERSECTION OF
 AI7409'OBSERVATORY CIRCLE NORTHWEST, THENCE 0.2 MILE (0.3 KM) NORTHWEST ALONG
 AI7409'OBSERVATORY CIRCLE NORTHWEST TO THE GUARD HOUSE, THENCE 0.5 MILE (0.8
 AI7409'KM) NORTH ALONG A PAVED ROAD TO THE TOP OF INCLINE TO THE SECOND
 AI7409'SIDEWALK LEADING TO THE ENTRANCE OF BUILDING NUMBER 52, CONTINUE 0.1
 AI7409'MILE (0.2 KM) IN NORTHERLY DIRECTION FOLLOWING THE ROAD PASSING
 AI7409'BUILDING NUMBER 59 ON LEFT TO A T INTERSECTION.  THENCE 0.05 MILE
 AI7409'(0.08 KM) EAST ALONG PAVED ROAD TO A Y INTERSECTION, THENCE ABOUT 58
 AI7409'METERS (190.3 FT) NORTH ALONG SIDEWALK TO BUILDING NO 3 (CHESTER B
 AI7409'WATTS) AND MARK INSIDE BUILDING.  10.0 FEET (3.0 M) NORTH OF DOOR SILL
 AI7409'OF BUILDING, 39.7 FEET (12.1 M) WEST OF EAST DOOR SILL OF BUILDING,
 AI7409'39.6 FEET (12.1 M) EAST OF WEST DOOR SILL OF BUILDING, A 8 INCH BRASS
 AI7409'PLATE SCREWED TO FLOOR. NOTE--CONTACT HEAD OF EARTH ORIENTATION DEPT.
 AI7409'(JIM RAY) AT 202-762-1444 BEFORE ENTERING OBSERVATORY GROUNDS.
1    National Geodetic Survey, Retrieval Date = FEBRUARY 21, 2026 01:29:18 EST
 HV1847 ***********************************************************************
 HV1847  DESIGNATION -  ZERO MILESTONE
 HV1847  PID         -  HV1847
 HV1847  STATE/COUNTY-  DC/DISTRICT OF COLUMBIA
 HV1847  COUNTRY     -  US
 HV1847  USGS QUAD   -  WASHINGTON WEST (2016)
 HV1847
 HV1847                         *CURRENT SURVEY CONTROL
 HV1847  ______________________________________________________________________
 HV1847* NAD 83(2011) POSITION- 38 53 42.38736(N) 077 02 11.57299(W)   ADJUSTED
 HV1847* NAD 83(2011) ELLIP HT-   -23.642 (meters)        (06/27/12)   ADJUSTED
 HV1847* NAD 83(2011) EPOCH   -  2010.00
 HV1847* NAVD 88 ORTHO HEIGHT -     8.382 (meters)       27.50  (feet) ADJUSTED
 HV1847  ______________________________________________________________________
 HV1847  GEOID HEIGHT    -        -32.075 (meters)                     GEOID18
 HV1847  NAD 83(2011) X  -  1,115,058.547 (meters)                     COMP
 HV1847  NAD 83(2011) Y  - -4,843,944.188 (meters)                     COMP
 HV1847  NAD 83(2011) Z  -  3,983,245.940 (meters)                     COMP
 HV1847  LAPLACE CORR    -         -2.36  (seconds)                    DEFLEC18
 HV1847  DYNAMIC HEIGHT  -          8.377 (meters)       27.48  (feet) COMP
 HV1847  MODELED GRAVITY -    980,097.7   (mgal)                       NAVD 88
 HV1847
 HV1847  VERT ORDER      -  FIRST     CLASS II
 HV1847
 HV1847  Network accuracy estimates per FGDC Geospatial Positioning Accuracy
 HV1847  Standards:
 HV1847         FGDC (95% conf, cm)     Standard deviation (cm)     CorrNE
 HV1847            Horiz  Ellip           SD_N   SD_E   SD_h      (unitless)
 HV1847  -------------------------------------------------------------------
 HV1847  NETWORK    1.42   1.06           0.66   0.46   0.54     -0.00920933
 HV1847  -------------------------------------------------------------------
 HV1847  Click here for local accuracies and other accuracy information.
 HV1847
 HV1847.The horizontal coordinates were established by GPS observations
 HV1847.and adjusted by the National Geodetic Survey in June 2012.
 HV1847
 HV1847.NAD 83(2011) refers to NAD 83 coordinates where the reference frame has 
 HV1847.been affixed to the stable North American tectonic plate. See 
 HV1847.www.ngs.noaa.gov/web/surveys/NA2011 for more information. 
 HV1847
 HV1847.The horizontal coordinates are valid at the epoch date displayed above
 HV1847.which is a decimal equivalence of Year/Month/Day.
 HV1847
 HV1847.The orthometric height was determined by differential leveling and
 HV1847.adjusted by the NATIONAL GEODETIC SURVEY
 HV1847.in May 1999.
 HV1847
 HV1847.Significant digits in the geoid height do not necessarily reflect accuracy.
 HV1847.GEOID18 height accuracy estimate available here.
 HV1847
 HV1847.Click photographs - Photos may exist for this station.
 HV1847
 HV1847.The X, Y, and Z were computed from the position and the ellipsoidal ht.
 HV1847
 HV1847.The Laplace correction was computed from DEFLEC18 derived deflections.
 HV1847
 HV1847.The ellipsoidal height was determined by GPS observations
 HV1847.and is referenced to NAD 83.
 HV1847
 HV1847.The dynamic height is computed by dividing the NAVD 88
 HV1847.geopotential number by the normal gravity value computed on the
 HV1847.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
 HV1847.degrees latitude (g = 980.6199 gals.).
 HV1847
 HV1847.The modeled gravity was interpolated from observed gravity values.
 HV1847
 HV1847. The following values were computed from the NAD 83(2011) position.
 HV1847
 HV1847;                    North         East     Units Scale Factor Converg.
 HV1847;SPC MD       -   136,362.841   396,829.463   MT  0.99994990   -0 01 22.6
 HV1847;SPC MD       -   447,383.75  1,301,931.33   sFT  0.99994990   -0 01 22.6
 HV1847;SPC VA N     - 2,137,368.949 3,626,950.101   MT  0.99996009   +0 54 48.1
 HV1847;SPC VA N     - 7,012,351.29 11,899,418.79   sFT  0.99996009   +0 54 48.1
 HV1847;UTM  18      - 4,307,108.012   323,383.705   MT  0.99998412   -1 16 44.7
 HV1847
 HV1847!             -  Elev Factor  x  Scale Factor =   Combined Factor
 HV1847!SPC MD       -   1.00000371  x   0.99994990  =   0.99995361
 HV1847!SPC VA N     -   1.00000371  x   0.99996009  =   0.99996380
 HV1847!UTM  18      -   1.00000371  x   0.99998412  =   0.99998783
 HV1847
 HV1847_U.S. NATIONAL GRID SPATIAL ADDRESS: 18SUJ2338307108(NAD 83)
 HV1847
 HV1847|---------------------------------------------------------------------|
 HV1847| PID    Reference Object                     Distance      Geod. Az  |
 HV1847|                                                           dddmmss.s |
 HV1847| HV1846 MERIDIAN STONE                      130.069 METERS 17951     |
 HV1847|---------------------------------------------------------------------|
 HV1847
 HV1847                          SUPERSEDED SURVEY CONTROL
 HV1847
 HV1847  NAD 83(2007)-  38 53 42.38757(N)    077 02 11.57375(W) AD(2002.00) 0
 HV1847  ELLIP H (02/10/07)  -23.610  (m)                       GP(2002.00)    
 HV1847  NAD 83(1993)-  38 53 42.38730(N)    077 02 11.57321(W) AD(       ) A
 HV1847  ELLIP H (08/09/02)  -23.628  (m)                       GP(       ) 4 2
 HV1847  NAD 83(1993)-  38 53 42.38730(N)    077 02 11.57321(W) AD(       ) 1
 HV1847  ELLIP H (06/29/94)  -23.626  (m)                       GP(       ) 4 1
 HV1847  NAD 83(1993)-  38 53 42.38732(N)    077 02 11.57320(W) AD(       ) 1
 HV1847  ELLIP H (04/04/94)  -23.626  (m)                       GP(       ) 4 1
 HV1847  NAD 83(1991)-  38 53 42.38738(N)    077 02 11.57308(W) AD(       ) 1
 HV1847  ELLIP H (12/31/92)  -23.659  (m)                       GP(       ) 4 2
 HV1847  USSD        -  38 53 42.32200(N)    077 02 12.49200(W) AD(       ) 3
 HV1847  NAVD 88 (09/11/02)    8.4    (m)  GEOID99  model used  GPS OBS        
 HV1847  NAVD 88               8.38   (m)           27.5    (f) LEVELING    3  
 HV1847  NAVD 88 (02/03/93)    8.384  (m)           27.51   (f) SUPERSEDED  1 0
 HV1847  NAVD 88               8.39   (m)           27.5    (f) LEVELING    3  
 HV1847  NAVD 88 (06/15/91)    8.387  (m)           27.52   (f) SUPERSEDED  1 0
 HV1847  NGVD 29 (08/12/92)    8.617  (m)           28.27   (f) ADJUSTED    1 0
 HV1847  NGVD 29 (??/??/87)    8.625  (m)           28.30   (f) SUPERSEDED  1 0
 HV1847
 HV1847.Superseded values are not recommended for survey control.
 HV1847
 HV1847.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
 HV1847.See file dsdata.pdf to determine how the superseded data were derived.
 HV1847
 HV1847_MARKER: V = STONE MONUMENT
 HV1847_SETTING: 9 = POST (STONE OR PRECAST CONCRETE)
 HV1847_MARK LOGO: NONE
 HV1847_PROJECTION: FLUSH
 HV1847_MAGNETIC: N = NO MAGNETIC MATERIAL
 HV1847_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
 HV1847_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
 HV1847+SATELLITE: SATELLITE OBSERVATIONS - July 18, 2018
 HV1847
 HV1847  HISTORY     - Date     Condition        Report By
 HV1847  HISTORY     - 1923     MONUMENTED       PBPP
 HV1847  HISTORY     - 1926     GOOD             CGS
 HV1847  HISTORY     - 1974     GOOD             NGS
 HV1847  HISTORY     - 1979     GOOD             NGS
 HV1847  HISTORY     - 1984     GOOD             NGS
 HV1847  HISTORY     - 19920615 GOOD             NGS
 HV1847  HISTORY     - 19980928 GOOD             NGS
 HV1847  HISTORY     - 20040612 GOOD             NGS
 HV1847  HISTORY     - 20060206 GOOD             GEOCAC
 HV1847  HISTORY     - 20081222 GOOD             NGS
 HV1847  HISTORY     - 20090319 GOOD             GEOCAC
 HV1847  HISTORY     - 20100418 GOOD             GEOCAC
 HV1847  HISTORY     - 20120301 GOOD             NGS
 HV1847  HISTORY     - 20140410 GOOD             NGS
 HV1847  HISTORY     - 20180718 GOOD             USPSQD
 HV1847
 HV1847                          STATION DESCRIPTION
 HV1847
 HV1847'DESCRIBED BY COAST AND GEODETIC SURVEY 1926
 HV1847'AT WASHINGTON.
 HV1847'AT WASHINGTON, AT THE NORTH SIDE OF THE ELLIPSE, AT THE JUNCTION
 HV1847'OF THE ELLIPSE ROAD AND THE STREET SOUTH OF THE WHITE HOUSE
 HV1847'GROUNDS, BETWEEN TWO CONCRETE SIDEWALKS, AND AT THE ZERO
 HV1847'MILESTONE.  THE TOP OF A SMALL PYRAMID AT THE CENTER OF A BRONZE
 HV1847'COMPASS ROSE ON TOP OF THE MILESTONE.  NOTE-- TIDAL STATION
 HV1847'PREVIOUSLY DESIGNATED ZERO MILESTONE=NW 2=TIDAL MARK.
 HV1847
 HV1847                          STATION RECOVERY (1974)
 HV1847
 HV1847'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974
 HV1847'RECOVERED IN GOOD CONDITION.
 HV1847
 HV1847                          STATION RECOVERY (1979)
 HV1847
 HV1847'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1979
 HV1847'RECOVERED IN GOOD CONDITION.
 HV1847
 HV1847                          STATION RECOVERY (1984)
 HV1847
 HV1847'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1984
 HV1847'RECOVERED IN GOOD CONDITION.
 HV1847
 HV1847                          STATION RECOVERY (1992)
 HV1847
 HV1847'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1992
 HV1847'THE STATION IS AT WASHINGTON, D.C. AT THE NORTH SIDE OF THE ELLIPSE,
 HV1847'AT THE JUNCTION OF THE ELLOPSE ROAD AND THE STREET SOUTH OF THE WHITE
 HV1847'HOUSE GROUNDS, BETWEEN TWO CONCRETE SIDEWALKS, AND AT THE ZERO
 HV1847'MILESTONE.  OWNERSHIP--U.S. GOVERNMENT
 HV1847'THE STATION IS THE TOP OF A SMALL PYRAMID AT THE CENTER OF A BRONZE
 HV1847'COMPASS ROSE ON TOP OF THE MILESTONE.
 HV1847
 HV1847                          STATION RECOVERY (1998)
 HV1847
 HV1847'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1998 (RLA)
 HV1847'RECOVERED AS DESCRIBED.
 HV1847
 HV1847                          STATION RECOVERY (2004)
 HV1847
 HV1847'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2004 (DW)
 HV1847'INTACT MONUMENT SUFFERS EROSION-BY-TOURIST, AS VISITORS USE IT AS A
 HV1847'CAMERA BASE TO PHOTOGRAPH WHITE HOUSE.
 HV1847
 HV1847                          STATION RECOVERY (2006)
 HV1847
 HV1847'RECOVERY NOTE BY GEOCACHING 2006
 HV1847'RECOVERED IN GOOD CONDITION.
 HV1847
 HV1847                          STATION RECOVERY (2008)
 HV1847
 HV1847'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2008 (DBC)
 HV1847'RECOVERED AS DESCRIBED.
 HV1847
 HV1847                          STATION RECOVERY (2009)
 HV1847
 HV1847'RECOVERY NOTE BY GEOCACHING 2009 (SMC)
 HV1847'RECOVERED IN GOOD CONDITION.
 HV1847
 HV1847                          STATION RECOVERY (2010)
 HV1847
 HV1847'RECOVERY NOTE BY GEOCACHING 2010 (GAH)
 HV1847'MARK IS JUST SOUTH OF THE CENTER OF THE STRETCH WHERE E STREET NW AND
 HV1847'ELLIPSE ROAD NW JOIN BRIEFLY AND IS IN A SLIGHTLY ENLARGED AREA OF THE
 HV1847'CONCRETE WALKWAY THAT CIRCLIES THE ELLIPSE INSIDE ELLIPSE ROAD.
 HV1847'BRASS PYRAMID SOMEWHAT WORN PER 2004 REPORT BUT OTHERWISE INTACT.
 HV1847'LEGEND ON ONE SIDE OF STONE PEDESTAL SAYS STARTING POINT OF THE FIRST
 HV1847'TRANSCONTINENTAL MOTOR CONVOY OVER THE LINCOLN HIGHWAY 7 JVL 1919,
 HV1847'DATE IS IN ROMAN NUMERALS.
 HV1847'ANOTHER SIDE SAYS POINT FOR THE MEASUREMENT OF DISTANCES FROM
 HV1847'WASHINGTON ON HIGHWAYS OF THE UNITED STATES.
 HV1847'
 HV1847
 HV1847                          STATION RECOVERY (2012)
 HV1847
 HV1847'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2012 (DRD)
 HV1847'RECOVERED AS DESCRIBED.
 HV1847
 HV1847                          STATION RECOVERY (2014)
 HV1847
 HV1847'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2014 (KF)
 HV1847'RECOVERED AS DESCRIBED.
 HV1847
 HV1847                          STATION RECOVERY (2018)
 HV1847
 HV1847'RECOVERY NOTE BY US POWER SQUADRON 2018 (RJS)
 HV1847'RECOVERED IN GOOD CONDITION.

 *** retrieval complete.
