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Details for Benchmark: HS5111

N 37° 42.875 W 121° 53.341 (NAD 83)

Altitude: 389.9

Coordinates may not be exact. Altitude is VERTCON and location is ADJUSTED. (more info)

Location:
In ALAMEDA county, CA View Original Datasheet
Designation:
ACC SITE 1964
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

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Documented History (by the NGS)

01/01/1964 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1964 (LGB) THE STATION IS 6-3/4 MILES NORTH-NORTHWEST OF LIVERMORE, 3-3/4 MILES NORTH OF PLEASANTON, 1 MILE NORTH OF U.S. HIGHWAY 50, AND ON PROPERTY OF CAMP PARKS MILITARY RESERVATION. TO REACH THE STATION FROM THE NORTH GATE OF TWO GATES AT THE WEST ENTRANCE TO CAMP PARKS, WHICH IS ABOUT 4 MILES NORTHWEST OF PLEASANTON, GO EAST ON 8TH STREET FOR 0.9 MILE TO ARNOLD AVENUE. CONTINUE EAST ON 8TH STREET FOR 0.2 MILE TO A PAVED SIDE ROAD RIGHT AND P 13 IN THE SOUTHEAST ANGLE. TURN RIGHT AND GO SOUTH ON PAVED ROAD FOR 0.1 MILE TO THE TOP OF THE HILL AND A CROSSROAD. TURN LEFT AND GO 0.05 MILE TO THE STATION ON THE LEFT AS DESCRIBED. THE STATION MARK IS A STANDARD DISK STAMPED ACC SITE 1964, SET IN THE TOP OF A CYLINDRICAL CONCRETE POST 18 INCHES IN DIAMETER AT THE TOP AND ENLARGED TO 24 INCHES IN DIAMETER LOWER DOWN. THE MARK IS FLUSH WITH THE GROUND. IT IS 129 FEET EAST OF THE CENTER OF THE NORTH-SOUTH PAVED ROAD, 44 FEET SOUTH-SOUTHWEST OF THE SOUTHWEST CORNER OF A BRICK BUILDING AND 39-1/2 FEET NORTH OF THE CENTER OF THE EAST-WEST PAVED ROAD. P 13 IS A STANDARD TRIANGULATION DISK STAMPED P 13 1964, SET IN THE TOP OF A CYLINDRICAL CONCRETE POST 18 INCHES IN DIAMETER AT THE TOP AND ENLARGED TO 24 INCHES IN DIAMETER LOWER DOWN. THE MARK IS FLUSH WITH THE GROUND. IT IS 73-1/2 FEET EAST OF THE CENTER OF A PAVED ROAD AND 69 FEET SOUTH OF THE CENTER OF 8TH STREET.
01/01/1969 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1969 (GRS) THE STATION WAS RECOVERED AND FOUND IN GOOD CONDITION AS DESCRIBED IN THE 1964 DESCRIPTION. THERE WAS NO NOTICEABLE EARTH MOVEMENT IN THE AREA OF THIS STATION. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--AT CAMP PARKS

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in March 1994. The horizontal coordinates are valid at the epoch date displayed above. The epoch date for horizontal control is a decimal equivalence of Year/Month/Day.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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