HV3866 ***********************************************************************
HV3866  DESIGNATION -  ROCK 2
HV3866  PID         -  HV3866
HV3866  STATE/COUNTY-  VA/ARLINGTON
HV3866  USGS QUAD   -  WASHINGTON WEST (1983)
HV3866
HV3866                         *CURRENT SURVEY CONTROL
HV3866  ___________________________________________________________________
HV3866* NAD 83(1993)-  38 54 40.12470(N)    077 06 02.59745(W)     ADJUSTED
HV3866* NAVD 88     -         1.     (meters)       3.     (feet)  SCALED
HV3866  ___________________________________________________________________
HV3866  LAPLACE CORR-          -2.56  (seconds)                    DEFLEC99
HV3866  GEOID HEIGHT-         -31.92  (meters)                     GEOID99
HV3866
HV3866  HORZ ORDER  -  SECOND
HV3866
HV3866.The horizontal coordinates were established by classical geodetic methods
HV3866.and adjusted by the National Geodetic Survey in November 1994.
HV3866
HV3866.The orthometric height was scaled from a topographic map.
HV3866
HV3866.The Laplace correction was computed from DEFLEC99 derived deflections.
HV3866
HV3866.The geoid height was determined by GEOID99.
HV3866
HV3866;                    North         East     Units   Scale      Converg.
HV3866;SPC MD       -   453,238.56  1,283,673.27   sFT  0.99995004 -0 03 47.6
HV3866;SPC VA N     - 2,139,062.328 3,621,356.549   MT  0.99996148 +0 52 23.9
HV3866;SPC MD       -   138,147.389   391,264.394   MT  0.99995004 -0 03 47.6
HV3866;UTM  18      - 4,309,014.241   317,858.846   MT  1.00000853 -1 19 11.5
HV3866
HV3866:                Primary Azimuth Mark                     Grid Az
HV3866:SPC VA N     -  CAMP                                     128 54 00.7
HV3866:SPC MD       -  CAMP                                     129 50 12.2
HV3866:UTM  18      -  CAMP                                     131 05 36.1
HV3866
HV3866|---------------------------------------------------------------------|
HV3866| PID    Reference Object                     Distance      Geod. Az  |
HV3866|                                                           dddmmss.s |
HV3866| HV3998 BENTON                              APPROX. 0.6 KM 0210353.6 |
HV3866| HV0308 CAMP                                APPROX. 1.1 KM 1294624.6 |
HV3866|        ROCK RM 1                            10.120 METERS 18212     |
HV3866| HV0463 BOUNDARY WITNESS MK 3 DC VA           8.805 METERS 19823     |
HV3866| HV3841 ROCK                                  0.674 METERS 20957     |
HV3866|        ROCK RM 2                            13.377 METERS 29802     |
HV3866|---------------------------------------------------------------------|
HV3866
HV3866                          SUPERSEDED SURVEY CONTROL
HV3866
HV3866  NAD 83(1993)-  38 54 40.12351(N)    077 06 02.59910(W) AD(       ) 2
HV3866  NAD 83(1986)-  38 54 40.12318(N)    077 06 02.60908(W) AD(       ) 2
HV3866  NAD 27      -  38 54 39.72200(N)    077 06 03.67900(W) AD(       ) 2
HV3866
HV3866.Superseded values are not recommended for survey control.
HV3866.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
HV3866.See file dsdata.txt to determine how the superseded data were derived.
HV3866
HV3866_MARKER: DS = TRIANGULATION STATION DISK
HV3866_SETTING: 66 = SET IN ROCK OUTCROP
HV3866
HV3866  HISTORY     - Date     Condition        Recov. By
HV3866  HISTORY     - 1935     MONUMENTED       CGS
HV3866  HISTORY     - 1946     GOOD             CGS
HV3866  HISTORY     - 1946     GOOD             CGS
HV3866  HISTORY     - 1974     GOOD             NGS
HV3866
HV3866                          STATION DESCRIPTION
HV3866
HV3866''DESCRIBED BY COAST AND GEODETIC SURVEY 1935 (JHB)
HV3866''THIS STATION WAS ESTABLISHED WHEN THE BUILDING PARTY FAILED TO
HV3866''RECOVER ROCK.  ROCK WAS LATER RECOVERED BY THE OBSERVING PARTY.
HV3866''IT IS MARKED BY A U.S. ENGINEERS DISK, WHILE ROCK 2 IS MARKED
HV3866''BY A STANDARD U.S.C. AND G.S. DISK UNSTAMPED.
HV3866''
HV3866''ROCK 2 DISK WAS CEMENTED IN THE DRILL HOLE THAT SERVED AS
HV3866''WITNESS MARK FOR ROCK.  IT IS ON A ROCK LEDGE ON THE VIRGINIA
HV3866''SIDE OF THE POTOMAC RIVER, ALMOST W OF THE TWIN RESERVOIRS, ABOUT
HV3866''50 METERS S OF A ROCK QUARRY NOW BEING WORKED, WITH A LOW STONE
HV3866''HUT DIRECTLY ABOVE IT, AND THE PATH ABOUT 5 METERS ABOVE IT,
HV3866''THE MARK BEING NEAR THE HIGH-WATER LINE.  IT IS ABOUT 15 INCHES
HV3866''ABOVE ROCK.
HV3866''
HV3866''ROCK REFERENCE MARK NO. 1 IS A STANDARD REFERENCE MARK SET IN
HV3866''A LARGE BOULDER ON THE OPPOSITE SIDE OF THE PATH AND ABOUT 2 METERS
HV3866''HIGHER.
HV3866''
HV3866''REFERENCE MARK NO. 2 IS A BOLT SET IN A BOULDER AT THE WATERS
HV3866''EDGE.
HV3866''
HV3866''ROCK IS A U.S.E.D. DISK CEMENTED IN A DRILL HOLE IN THE SAME
HV3866''LEDGE WITH ROCK 2.
HV3866''
HV3866''A 4-FOOT STAND WAS USED.
HV3866
HV3866                          STATION RECOVERY (1946)
HV3866
HV3866''RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JMN)
HV3866''REFERENCE MARK 1 HAS BEEN MOVED TOWARD RIVER, PROBABLY DUE TO A
HV3866''LANDSLIDE.  OTHERWISE, AS DESCRIBED AND IN GOOD CONDITION.
HV3866
HV3866                          STATION RECOVERY (1946)
HV3866
HV3866''RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (RCB)
HV3866''THE STATION WAS RECOVERED AS DESCRIBED AND ALL MARKS WERE FOUND
HV3866''TO BE IN GOOD CONDITION, EXCEPT THAT R.M. 2 WAS NOT RECOVERED.
HV3866''A COMPLETE NEW DESCRIPTION FOLLOWS--THE STATION IS LOCATED ON THE
HV3866''VIRGINIA SIDE OF THE POTOMAC ALMOST DIRECTLY ACROSS THE RIVER FROM
HV3866''THE N END OF THE TWIN RESERVOIRS.  THE ROCK QUARRY MENTIONED
HV3866''IN THE OLD DESCRIPTION IS NOW ABANDONED AND OVERGROWN AND THE
HV3866''STONE HUT NEAR THE STATION HAS BEEN DESTROYED.  THE DISK AND
HV3866''THE STONE HUT NEAR THE STATION HAS BEEN DESTROYED.  THE DISK IS
HV3866''ON THE POINT OF A BOULDER AT THE WATERS EDGE AND IS UNSTAMPED.
HV3866''
HV3866''REFERENCE MARK 1 IS 33.20 FEET SW OF THE STATION.  THE DISK IS
HV3866''UNSTAMPED AND ALSO SERVES AS A REFERENCE MARK FOR D.C. - VA.
HV3866''BOUNDARY WITNESS MARK NO. 3.  DISK IS CEMENTED IN A DRILL HOLE
HV3866''IN A BOULDER NEAR THE WATERS EDGE.
HV3866''
HV3866''A TRAVERSE CONNECTION WAS MADE FROM ROCK 2 TO D.C. - VA. BOUNDARY
HV3866''WITNESS MARK NO. 3 AND THE DISTANCE WAS FOUND TO BE 8.805 METERS.
HV3866
HV3866                          STATION RECOVERY (1974)
HV3866
HV3866''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974 (GWJ)
HV3866''RECOVERED AS DESCRIBED.