HV7992 ***********************************************************************
HV7992  DESIGNATION -  46 002 RESET
HV7992  PID         -  HV7992
HV7992  STATE/COUNTY-  VA/ARLINGTON
HV7992  USGS QUAD   -  ALEXANDRIA (1994)
HV7992
HV7992                         *CURRENT SURVEY CONTROL
HV7992  ___________________________________________________________________
HV7992* NAD 83(1993)-  38 50 29.24524(N)    077 02 52.89001(W)     ADJUSTED
HV7992* NAVD 88     -         4.649  (meters)      15.25   (feet)  ADJUSTED
HV7992  ___________________________________________________________________
HV7992  X           -   1,114,925.287 (meters)                     COMP
HV7992  Y           -  -4,847,807.049 (meters)                     COMP
HV7992  Z           -   3,978,606.409 (meters)                     COMP
HV7992  LAPLACE CORR-          -3.08  (seconds)                    DEFLEC99
HV7992  ELLIP HEIGHT-         -27.36  (meters)                     GPS OBS
HV7992  GEOID HEIGHT-         -32.11  (meters)                     GEOID99
HV7992  DYNAMIC HT  -           4.646 (meters)      15.24  (feet)  COMP
HV7992  MODELED GRAV-     980,093.6   (mgal)                       NAVD 88
HV7992
HV7992  HORZ ORDER  -  SECOND
HV7992  VERT ORDER  -  FIRST     CLASS II
HV7992  ELLP ORDER  -  FOURTH    CLASS II
HV7992
HV7992.The horizontal coordinates were established by GPS observations
HV7992.and adjusted by the National Geodetic Survey in November 1994.
HV7992
HV7992.The orthometric height was determined by differential leveling
HV7992.and adjusted by the National Geodetic Survey in November 2000.
HV7992.No vertical observational check was made to the station.
HV7992
HV7992.The X, Y, and Z were computed from the position and the ellipsoidal ht.
HV7992
HV7992.The Laplace correction was computed from DEFLEC99 derived deflections.
HV7992
HV7992.The ellipsoidal height was determined by GPS observations
HV7992.and is referenced to NAD 83.
HV7992
HV7992.The geoid height was determined by GEOID99.
HV7992
HV7992.The dynamic height is computed by dividing the NAVD 88
HV7992.geopotential number by the normal gravity value computed on the
HV7992.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
HV7992.degrees latitude (g = 980.6199 gals.).
HV7992
HV7992.The modeled gravity was interpolated from observed gravity values.
HV7992
HV7992;                    North         East     Units   Scale      Converg.
HV7992;SPC MD       -   427,845.90  1,298,654.58   sFT  0.99995003 -0 01 48.5
HV7992;SPC VA N     - 2,131,398.224 3,626,048.785   MT  0.99995600 +0 54 22.3
HV7992;SPC MD       -   130,407.690   395,830.707   MT  0.99995003 -0 01 48.5
HV7992;UTM  18      - 4,301,175.954   322,254.675   MT  0.99998905 -1 17 05.2
HV7992
HV7992                          SUPERSEDED SURVEY CONTROL
HV7992
HV7992  NAD 83(1993)-  38 50 29.24610(N)    077 02 52.88793(W) AD(       ) 2
HV7992  ELLIP HT    -         -27.34  (m)                      GP(       ) 4 2
HV7992  NGVD 29     -         4.88   (m)           16.0    (f) RESET       3
HV7992
HV7992.Superseded values are not recommended for survey control.
HV7992.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
HV7992.See file dsdata.txt to determine how the superseded data were derived.
HV7992
HV7992_MARKER: DV = VERTICAL CONTROL DISK
HV7992_SETTING: 32 = RETAINING WALL
HV7992_STAMPING: 46 002 NPS RESET 1973
HV7992_MAGNETIC: N = NO MAGNETIC MATERIAL
HV7992_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
HV7992+STABILITY: SURFACE MOTION
HV7992_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
HV7992+SATELLITE: SATELLITE OBSERVATIONS - September 07, 1991
HV7992
HV7992  HISTORY     - Date     Condition        Recov. By
HV7992  HISTORY     - 1973     MONUMENTED       USE
HV7992  HISTORY     - 19910907 GOOD             WHGAI
HV7992  HISTORY     - 20000801 GOOD             NGS
HV7992
HV7992                          STATION DESCRIPTION
HV7992
HV7992''DESCRIBED BY US ENGINEERS 1973
HV7992''AT ARLINGTON.
HV7992''ABOUT 2.25 MILES SOUTH ALONG THE MT. VERNON MEMORIAL HIGHWAY FROM
HV7992''THE SOUTHWEST END OF THE RICHMOND, FREDRICKSBURG AND POTOMAC RAIL ROAD
HV7992''BRIDGE OVER THE POTOMAC RIVER, 2.65 MILES NORTH ALONG THE MT.VERNON
HV7992''MEMORIAL HIGHWAY FROM THE POST OFFICE AT ALEXANDRIA, SET ON THE NORTH
HV7992''EAST CORNER OF THE BIKE PATH BRIDGE OVER FOUR MILE RUN.
HV7992
HV7992                          STATION RECOVERY (1991)
HV7992
HV7992''RECOVERY NOTE BY W H GORDON ASSC 1991
HV7992''RECOVERED IN GOOD CONDITION.
HV7992
HV7992                          STATION RECOVERY (2000)
HV7992
HV7992''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2000 (DBC)
HV7992''1.05 MILE (1.69 KM) NORTH ALONG G W MEMORIAL PARKWAY FROM THE JUNCTION
HV7992''OF SLATER LANE AND G W MEMORIAL PARKWAY IN ALEXANDRIA AT THE NORTH END
HV7992''OF A BRIDGE OVER 4 MILE (6.4 KM) RUN.  34.0 FEET (10.4 M) EAST OF
HV7992''CENTERLINE OF PARKWAY NORTHBOUND LANES, 3.0 FEET (0.9 M) NORTH OF
HV7992''NORTH EDGE OF HAND RAIL, 32.0 FEET (9.8 M) SOUTHWEST OF Y JUNCTION FOR
HV7992''BIKE AND WALKING TRAILS, 11.0 FEET (3.4 M) EAST OF NORTH END OF
HV7992''BULKHEAD, 37.6 FEET (11.5 M) NORTH OF THE NORTH END OF MAIN BRIDGE,
HV7992''ABOUT LEVEL WITH GROUND.