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Details for Benchmark: HS3978

N 37° 42.100 W 121° 52.750 (NAD 83)

Altitude: 353.5

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

Location:
In ALAMEDA county, CA View Original Datasheet
Designation:
P 24 N
Marker Type:
nail
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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Documented History (by the NGS)

Unknown by CGS (MONUMENTED)
01/01/1964 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1964 4.8 MI NW FROM PLEASANTON. A COPPER NAIL AND WASHER SET IN THE SIDE OF THE CONCRETE POST SURROUNDING THE ROD. FOR DESCRIPTION SEE P 24 ABOVE.
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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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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