HT0496 ***********************************************************************
HT0496  DESIGNATION -  P 386
HT0496  PID         -  HT0496
HT0496  STATE/COUNTY-  CA/SAN MATEO
HT0496  USGS QUAD   -  SAN MATEO (1997)
HT0496
HT0496                         *CURRENT SURVEY CONTROL
HT0496  ___________________________________________________________________
HT0496* NAD 83(1986)-  37 31 46.     (N)    122 21 44.     (W)     SCALED
HT0496* NAVD 88     -        93.15   (+/-2cm)     305.6    (feet)  VERTCON
HT0496  ___________________________________________________________________
HT0496  GEOID HEIGHT-         -32.51  (meters)                     GEOID99
HT0496
HT0496  VERT ORDER  -  FIRST     CLASS II (See Below)
HT0496
HT0496.The horizontal coordinates were scaled from a topographic map and have
HT0496.an estimated accuracy of +/- 6 seconds.
HT0496
HT0496.The NAVD 88 height was computed by applying the VERTCON shift value to
HT0496.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
HT0496.The vertical order pertains to the superseded datum.
HT0496
HT0496.The geoid height was determined by GEOID99.
HT0496
HT0496;                    North         East    Units  Estimated Accuracy
HT0496;SPC CA 3     -   615,890.    1,835,420.      MT  (+/- 180 meters Scaled)
HT0496
HT0496                          SUPERSEDED SURVEY CONTROL
HT0496
HT0496  NGVD 29     -        92.288  (m)          302.78   (f) ADJ UNCH    1 2
HT0496
HT0496.Superseded values are not recommended for survey control.
HT0496.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
HT0496.See file dsdata.txt to determine how the superseded data were derived.
HT0496
HT0496_MARKER: DB = BENCH MARK DISK
HT0496_SETTING: 36 = BRIDGE WHEEL GUARD
HT0496_STAMPING: P 386 1936
HT0496_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
HT0496
HT0496  HISTORY     - Date     Condition        Recov. By
HT0496  HISTORY     - 1936     MONUMENTED       CGS
HT0496  HISTORY     - 1973     GOOD             NGS
HT0496
HT0496                          STATION DESCRIPTION
HT0496
HT0496''DESCRIBED BY NATIONAL GEODETIC SURVEY 1973
HT0496''4 MI SW FROM SAN MATEO.
HT0496''ABOUT 0.7 MILE SOUTHWEST ALONG THIRD AVENUE FROM THE SOUTHERN
HT0496''PACIFIC COMPANY RAILROAD STATION AT SAN MATEO, THENCE 3.2 MILES
HT0496''SOUTHWEST ALONG CRYSTAL SPRINGS ROAD, THENCE 0.1 MILE SOUTH ALONG
HT0496''SKYLINE BOULEVARD, IN THE TOP OF THE NORTH END OF THE WEST
HT0496''CONCRETE WHEEL GUARD OF BRIDGE 35-05 OVER CRYSTAL SPRINGS DAM,
HT0496''15.6 FEET WEST OF THE CENTER LINE OF THE ROAD, 2.7 FEET SOUTH
HT0496''OF THE NORTH END OF THE WEST BARRIER RAIL AND 1/2 FOOT HIGHER
HT0496''THAN THE ROAD.  NOTE-- A ROD CAN NOT BE HELD ON THE MARK AS THE
HT0496''BARRIER RAIL IS DIRECTLY OVER IT.