HV1676 ***********************************************************************
HV1676  DESIGNATION -  YARDS
HV1676  PID         -  HV1676
HV1676  STATE/COUNTY-  VA/C OF ALEXANDRIA
HV1676  USGS QUAD   -  ALEXANDRIA (1994)
HV1676
HV1676                         *CURRENT SURVEY CONTROL
HV1676  ___________________________________________________________________
HV1676* NAD 83(1993)-  38 50 18.53681(N)    077 02 44.01318(W)     ADJUSTED
HV1676* NAVD 88     -         7.726  (meters)      25.35   (feet)  ADJUSTED
HV1676  ___________________________________________________________________
HV1676  LAPLACE CORR-          -3.06  (seconds)                    DEFLEC99
HV1676  GEOID HEIGHT-         -32.12  (meters)                     GEOID99
HV1676  DYNAMIC HT  -           7.721 (meters)      25.33  (feet)  COMP
HV1676  MODELED GRAV-     980,093.5   (mgal)                       NAVD 88
HV1676
HV1676  HORZ ORDER  -  SECOND
HV1676  VERT ORDER  -  FIRST     CLASS I
HV1676
HV1676.The horizontal coordinates were established by classical geodetic methods
HV1676.and adjusted by the National Geodetic Survey in November 1994.
HV1676
HV1676.The orthometric height was determined by differential leveling
HV1676.and adjusted by the National Geodetic Survey in June 1991.
HV1676.WARNING-Repeat measurements at this control monument indicate possible
HV1676.vertical movement.
HV1676
HV1676.The Laplace correction was computed from DEFLEC99 derived deflections.
HV1676
HV1676.The geoid height was determined by GEOID99.
HV1676
HV1676.The dynamic height is computed by dividing the NAVD 88
HV1676.geopotential number by the normal gravity value computed on the
HV1676.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
HV1676.degrees latitude (g = 980.6199 gals.).
HV1676
HV1676.The modeled gravity was interpolated from observed gravity values.
HV1676
HV1676;                    North         East     Units   Scale      Converg.
HV1676;SPC MD       -   426,762.21  1,299,356.36   sFT  0.99995006 -0 01 42.9
HV1676;SPC VA N     - 2,131,071.455 3,626,268.058   MT  0.99995580 +0 54 27.9
HV1676;SPC MD       -   130,077.383   396,044.610   MT  0.99995006 -0 01 42.9
HV1676;UTM  18      - 4,300,841.031   322,461.302   MT  0.99998815 -1 16 59.4
HV1676
HV1676:                Primary Azimuth Mark                     Grid Az
HV1676:SPC VA N     -  GREBLE 2                                 118 00 30.7
HV1676:SPC MD       -  GREBLE 2                                 118 56 41.5
HV1676:UTM  18      -  GREBLE 2                                 120 11 58.0
HV1676
HV1676|---------------------------------------------------------------------|
HV1676| PID    Reference Object                     Distance      Geod. Az  |
HV1676|                                                           dddmmss.s |
HV1676| HV4666 GREBLE 2                            APPROX. 3.0 KM 1185458.6 |
HV1676|        YARDS RM 1                           14.286 METERS 21355     |
HV1676|        YARDS RM 2                           14.265 METERS 28345     |
HV1676|---------------------------------------------------------------------|
HV1676
HV1676                          SUPERSEDED SURVEY CONTROL
HV1676
HV1676  NAD 83(1993)-  38 50 18.53524(N)    077 02 44.01465(W) AD(       ) 2
HV1676  NAD 83(1986)-  38 50 18.53525(N)    077 02 44.02581(W) AD(       ) 2
HV1676  NAD 27      -  38 50 18.13200(N)    077 02 45.10400(W) AD(       ) 2
HV1676  NGVD 29     -         7.963  (m)           26.13   (f) ADJUSTED    1 1
HV1676
HV1676.Superseded values are not recommended for survey control.
HV1676.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
HV1676.See file dsdata.txt to determine how the superseded data were derived.
HV1676
HV1676_MARKER: DS = TRIANGULATION STATION DISK
HV1676_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
HV1676_STAMPING: YARDS 1935
HV1676_MAGNETIC: N = NO MAGNETIC MATERIAL
HV1676_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
HV1676+STABILITY: SURFACE MOTION
HV1676
HV1676  HISTORY     - Date     Condition        Recov. By
HV1676  HISTORY     - 1935     MONUMENTED       CGS
HV1676  HISTORY     - 1938     GOOD             CGS
HV1676  HISTORY     - 1946     GOOD             CGS
HV1676  HISTORY     - 1946     GOOD             CGS
HV1676  HISTORY     - 1949     GOOD             CGS
HV1676  HISTORY     - 1965     GOOD             CGS
HV1676  HISTORY     - 1971     GOOD             NGS
HV1676  HISTORY     - 20000801 GOOD             NGS
HV1676
HV1676                          STATION DESCRIPTION
HV1676
HV1676''DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (JHB)
HV1676''THIS STATION IS LOCATED ON THE W BANK OF THE POTOMAC RIVER, ABOUT
HV1676''0.6 MILE SW OF HUNTERS POINT AND 2.7 MILES S BY ROAD OF
HV1676''WASHINGTON.  IT IS ABOUT 150 FEET E OF THE MEMORIAL HIGHWAY,
HV1676''8 FEET W OF THE BANK, AND 27 FEET E OF THE CENTER LINE OF THE
HV1676''BRIDLE PATH WHICH RUNS N AND S OVER THE BLUFF.  LAND IS OWNED
HV1676''BY THE U.S. GOVERNMENT.  MARK PROJECTS 3 INCHES.
HV1676''
HV1676''SURFACE, UNDERGROUND, AND REFERENCE MARKS ARE STANDARD BRONZE
HV1676''DISKS SET IN CONCRETE.
HV1676''
HV1676''REFERENCE MARK NO. 1 IS SW OF THE STATION ON THE SIDE OF THE
HV1676''BRIDLE PATH.  MARK PROJECTS 3 INCHES.
HV1676''
HV1676''REFERENCE MARK NO. 2 IS WNW OF THE STATION, 3 FEET W OF THE
HV1676''BRIDLE PATH AND PROJECTS 3 INCHES.
HV1676''
HV1676''REACHED FROM WASHINGTON BY FOLLOWING 2.7 MILES S ON THE MEMORIAL
HV1676''HIGHWAY FROM THE W END OF THE FOURTEENTH STREET BRIDGE.
HV1676
HV1676                          STATION RECOVERY (1938)
HV1676
HV1676''RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1938 (TMP)
HV1676''STATION MARK AND REFERENCE MARKS RECOVERED.
HV1676
HV1676                          STATION RECOVERY (1946)
HV1676
HV1676''RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
HV1676''STATION RECOVERED AS DESCRIBED AND FOUND TO BE IN GOOD CONDITION.
HV1676''REFERENCE MARKS WERE DESTROYED BY GRADING.  DESCRIPTION IS
HV1676''ADEQUATE.
HV1676
HV1676                          STATION RECOVERY (1946)
HV1676
HV1676''RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (RCB)
HV1676''THE STATION WAS RECOVERED IN GOOD CONDITION, BUT THE MARK IS
HV1676''NOW ABOUT 1 FOOT UNDERGROUND DUE TO FILLING-IN DONE WHEN OIL
HV1676''DOCKS WERE BUILT.  IT IS BELIEVED THAT THE REFERENCE MARKS WERE
HV1676''COVERED AT THIS TIME ALSO.  THEY COULD NOT BE RECOVERED AT
HV1676''THIS TIME.  A COMPLETE NEW DESCRIPTION FOLLOWS--
HV1676''
HV1676''THE STATION IS LOCATED ABOUT 1/4 MILE S OF NATIONAL AIRPORT
HV1676''ON THE VIRGINIA SIDE OF THE POTOMAC RIVER.  IT IS 150 FEET E OF
HV1676''MEMORIAL HIGHWAY, ON A LINE AND BETWEEN TWO SMALL WHITE BUILDINGS
HV1676''ON THE BLUFF OVERLOOKING THE RIVER.  IT IS ABOUT 50 FEET N OF THE
HV1676''ENTRANCE TO THE OIL DOCK WHICH SERVICES THE AIRPORT.
HV1676
HV1676                          STATION RECOVERY (1949)
HV1676
HV1676''RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1949 (BCM)
HV1676''LOCATED RECOVERED.  DESCRIPION ADEQUATE.  THERE IS A PARTLY-FILLED
HV1676''HOLE AT THE POINT DESCRIBED.  DIGGING EQUIPMENT WAS NOT
HV1676''AVAILABLE, SO MARK COULD NOT BE UNCOVERED.
HV1676
HV1676                          STATION RECOVERY (1965)
HV1676
HV1676''RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1965 (SPH)
HV1676''THE STATION MARK WAS RECOVERED IN GOOD CONDITION.  THE REFERENCE
HV1676''MARKS WERE NOT RECOVERED AND ARE EITHER COVERED BY DIRT OR
HV1676''GRADED OUT.  THE STATION IS 165 FEET EAST OF THE CENTER OF THE
HV1676''MEDIAN STRIP OF MT. VERNON HIGHWAY, 51 FEET NORTHEAST OF THE
HV1676''GATE TO OIL DOCK (SIGN ON GATE--RESTRICTED AREA), 34 FEET EAST
HV1676''OF THE CENTERLINE OF A PAVED SERVICE ROAD, AND 12 FEET NORTH
HV1676''OF A CYCLONE FENCE CORNER.  A 3 INCH YELLOW PIPE 2 FEET HIGH
HV1676''IS SET BY THE NORTHWEST CORNER OF THE MONUMENT.  THE MONUMENT
HV1676''IS 8 INCHES UNDERGROUND AND IS STAMPED YARDS 1935.
HV1676
HV1676                          STATION RECOVERY (1971)
HV1676
HV1676''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971
HV1676''AT ALEXANDRIA.
HV1676''AT ALEXANDRIA, ABOUT 2.45 MILES NORTH ALONG MT. VERNON MEMORIAL
HV1676''HIGHWAY FROM THE POST OFFICE AND COURTHOUSE AT ALEXANDRIA, 145
HV1676''FEET EAST OF THE CENTER LINE OF THE EAST LANES OF THE HIGHWAY,
HV1676''ON A SMALL BLUFF IN THE EAST EDGE OF A SMALL PARK WHICH OVERLOOKS
HV1676''THE POTOMAC RIVER, 33 FEET EAST OF THE CENTER LINE OF A PAVED
HV1676''ROAD WHICH END AT THE PARK, 81 FEET EAST AND ACROSS THE ROAD
HV1676''FROM A 32-INCH OAK TREE, 11 1/2 FEET NORTH-NORTHWEST OF THE
HV1676''METAL CORNER POST AT THE NORTHWEST CORNER OF A CHAIN LINK FENCE
HV1676''SURROUNDING AN OIL LOADING DOCK, 0.8 FOOT EAST OF A METAL WITNESS
HV1676''POST WHICH IS PAINTED ORANGE, ABOUT 5 FEET ABOVE THE LEVEL OF
HV1676''THE HIGHWAY, AND SET IN THE TOP OF A CONCRETE POST WHICH IS 5
HV1676''INCHES BELOW THE SURFACE OF THE GROUND.
HV1676
HV1676                          STATION RECOVERY (2000)
HV1676
HV1676''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2000 (RWA)
HV1676''0.95 MILE (1.53 KM) NORTH ALONG GEORGE WASHINGTON PARKWAY FROM THE
HV1676''JUNCTION OF SLATERS LANE IN ALEXANDRIA, NEA A CHAIN LINK FENCE FOR AN
HV1676''ABANDONED OIL DOCK.  145.6 FEET (44.4 M) EAST OF CENTERLINE OF
HV1676''NORTHBOUND LANES OF G W PARKWAY, 11.6 FEET (3.5 M) NORTH OF NORTHWEST
HV1676''CORNER POST FOR A CHAIN LINK FENCE, 33.0 FEET (10.1 M) EAST OF THE
HV1676''CENTERLINE OF A PAVED BIKE PATH, 69.2 FEET (21.1 M) SOUTHWEST OF A 3
HV1676''TRUNK TREE, 5 INCHES BELOW GROUND.