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Details for Benchmark: HS3517

N 37° 40.617 W 121° 47.717 (NAD 83)

Altitude: 436.4

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

Location:
In ALAMEDA county, CA View Original Datasheet
Designation:
LIVERMORE EB AZ RESET 64
Marker Type:
azimuth mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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I think I could see where this was, but the location is under a sidewalk, as a reported in 1976 for HS3513, the station this was originally the AZ for.

Documented History (by the NGS)

01/01/1964 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1964 1.4 MI W FROM LIVERMORE. 1.4 MILES WEST ALONG THE SOUTHERN PACIFIC COMPANY RAILROAD TRACK FROM THE STATION AT LIVERMORE, ON THE SOUTH SIDE OF THE PLEASANTON-LIVERMORE ROAD, AT A DOUBLE 48-INCH CONCRETE PIPE CULVERT, CEMENTED IN A DRILL HOLE IN THE TOP AND CENTER OF THE SOUTH CONCRETE HEADWALL, 146 FEET WEST OF THE CENTERLINE OF A STREET LEADING SOUTH, 143.0 FEET SOUTH OF THE SOUTH RAIL OF THE SOUTHERN PACIFIC COMPANY RAILROAD TRACK, 66.0 FEET SOUTH OF THE CENTERLINE OF THE PLEASANTON-LIVERMORE ROAD, 17.6 FEET WEST OF A FENCE CORNER, 0.3 FOOT NORTH OF A FENCE LINE, AND ABOUT 1 FOOT LOWER THAN THE ROAD.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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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