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Details for Benchmark: HS3512

N 37° 40.667 W 121° 47.383 (NAD 83)

Altitude: 459.8

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

Location:
In ALAMEDA county, CA View Original Datasheet
Designation:
LIVERMORE EAST BASE RM 1
Marker Type:
reference mark disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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HS3513 provides precise location data for this RM, but I couldn't find it.

Darn! Maybe another day.

Documented History (by the NGS)

01/01/1947 by CGS (MONUMENTED)
01/01/1958 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1958 1.1 MI W FROM LIVERMORE. 1.1 MILES WEST ALONG THE SOUTHERN PACIFIC COMPANY RAILROAD FROM THE STATION AT LIVERMORE, IN R2E T3S S18, 9 RAILS EAST OF THE CROSSING OF A PRIVATE ASPHALT ROAD, AT A DIRT CUT BANK, 110 FEET NORTHWEST OF THE WEST END OF WOODEN BRIDGE 45.90 OVER ARROYO MOCHO, 88.7 FEET EAST OF TRIANGULATION STATION LIVERMORE EAST BASE, 54 FEET NORTH OF THE NORTH RAIL OF THE SOUTHERN PACIFIC COMPANY RAILROAD TRACK, AND SET IN THE TOP OF A CONCRETE POST FLUSH WITH THE GROUND.
01/01/1974 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974 RECOVERED IN GOOD CONDITION.
01/01/1976 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1976 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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 geoid height was determined by GEOID99.

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