HT1801 ***********************************************************************
HT1801  DESIGNATION -  K 481
HT1801  PID         -  HT1801
HT1801  STATE/COUNTY-  CA/MARIN
HT1801  USGS QUAD   -  POINT BONITA (1993)
HT1801
HT1801                         *CURRENT SURVEY CONTROL
HT1801  ___________________________________________________________________
HT1801* NAD 83(1986)-  37 49 51.     (N)    122 31 23.     (W)     SCALED
HT1801* NAVD 88     -         7.35   (+/-2cm)      24.1    (feet)  VERTCON
HT1801  ___________________________________________________________________
HT1801  GEOID HEIGHT-         -32.48  (meters)                     GEOID99
HT1801
HT1801  VERT ORDER  -  FIRST     CLASS II (See Below)
HT1801
HT1801.The horizontal coordinates were scaled from a topographic map and have
HT1801.an estimated accuracy of +/- 6 seconds.
HT1801
HT1801.The NAVD 88 height was computed by applying the VERTCON shift value to
HT1801.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
HT1801.The vertical order pertains to the superseded datum.
HT1801
HT1801.The geoid height was determined by GEOID99.
HT1801
HT1801;                    North         East    Units  Estimated Accuracy
HT1801;SPC CA 3     -   649,620.    1,821,930.      MT  (+/- 180 meters Scaled)
HT1801
HT1801                          SUPERSEDED SURVEY CONTROL
HT1801
HT1801  NGVD 29     -         6.515  (m)           21.37   (f) ADJ UNCH    1 2
HT1801
HT1801.Superseded values are not recommended for survey control.
HT1801.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
HT1801.See file dsdata.txt to determine how the superseded data were derived.
HT1801
HT1801_MARKER: DB = BENCH MARK DISK
HT1801_SETTING: 30 = CULVERT
HT1801_STAMPING: K 481 1951
HT1801_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
HT1801
HT1801  HISTORY     - Date     Condition        Recov. By
HT1801  HISTORY     - 1951     MONUMENTED       CGS
HT1801  HISTORY     - 1964     GOOD             NGS
HT1801
HT1801                          STATION DESCRIPTION
HT1801
HT1801''DESCRIBED BY COAST AND GEODETIC SURVEY 1951
HT1801''1.1 MI NE FROM POINT BONITA CG STATION.
HT1801''ABOUT 0.1 MILES WEST ALONG A GRAVEL ROAD FROM THE U.S. COAST
HT1801''GUARD STATION AT POINT BONITA, THENCE 1 MILES NORTHEAST ALONG
HT1801''FIELD ROAD, ABOUT 105 YARDS SOUTHWEST OF THE Y JUNCTION OF BUNKER
HT1801''AND FIELD ROADS, AT THE JUNCTION OF BUNKER AND BOSWORTH ROADS,
HT1801''IN THE TOP OF THE SOUTHWEST END OF A LONG CURVED HEADWALL,
HT1801''28 FEET SOUTH OF THE CENTER LINE OF BUNKER ROAD, 14 FEET
HT1801''EAST OF THE CENTER LINE OF BOSWORTH ROAD, AND SET LEVEL WITH
HT1801''THE ROADS.
HT1801
HT1801                          STATION RECOVERY (1964)
HT1801
HT1801''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1964
HT1801''RECOVERED IN GOOD CONDITION.