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Details for Benchmark: HS3509

N 37° 41.783 W 121° 47.167 (NAD 83)

Altitude: 450.1

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

Location:
In ALAMEDA county, CA View Original Datasheet
Designation:
T 832
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Documented History (by the NGS)

01/01/1947 by CGS (MONUMENTED)
01/01/1960 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1960 1.4 MI NW FROM LIVERMORE. 0.7 MILE NORTH ALONG L STREET FROM THE SOUTHERN PACIFIC RAILROAD STATION AT LIVERMORE, THENCE 0.7 MILE NORTHWEST ALONG JUNCTION AVENUE, AT THE LIVERMORE SKY RANCH AIRPORT, NEAR THE SOUTHEAST CORNER OF THE FIELD, AT A BEACON LIGHT, IN TOP OF THE CONCRETE BASE, 4.4 FEET WEST-SOUTHWEST OF THE NORTHEAST CORNER OF THE BASE AND 1.7 FEET SOUTH OF THE NORTH EDGE OF THE BASE.
01/01/1965 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1965 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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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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