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Details for Benchmark: HS3012

N 37° 24.033 W 121° 57.767 (NAD 83)

Altitude: 19

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

Location:
In SANTA CLARA county, CA View Original Datasheet
Designation:
Y 591
Marker Type:
bench 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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Described as MARK NOT FOUND. 50sumtin

Documented History (by the NGS)

01/01/1950 by CGS (MONUMENTED)
01/01/1954 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1954 0.5 MI NW FROM AGNEW. 0.5 MILE NORTHWEST ALONG SANTA CLARA-ALVISO ROAD FROM THE SOUTHERN PACIFIC COMPANY RAILROAD STATION AT AGNEW, AT THE T JUNCTION OF A FARM ROAD LEADING NORTHEAST, 44.4 FEET NORTHWEST OF TELEPHONE POLE 93, 29.5 FEET NORTHEAST OF THE CENTER LINE OF SANTA CLARA-ALVISO ROAD, 11 1/2 FEET SOUTHWEST OF THE SOUTHEAST ONE OF TWO LARGE GUM TREES, 14.7 FEET SOUTHEAST OF THE CENTER LINE OF THE FARM ROAD, 1.5 FEET SOUTHEAST OF A WITNESS POST, ABOUT LEVEL WITH THE ROAD, 0.1 FOOT UNDERGROUND, AND SET IN THE TOP OF A CONCRETE POST.
01/01/1960 by NGS (MARK NOT FOUND)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1960 MARK NOT FOUND.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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