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Details for Benchmark: JT0146

N 38° 02.750 W 122° 08.217 (NAD 83)

Altitude: 44.4

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

Location:
In SOLANO county, CA View Original Datasheet
Designation:
BENICIA ARSENAL 13
Marker Type:
survey disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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This one is apparently missing. The retaining wall is there, but just at the spot mentioned in the description there is a big chunk missing. Everything else matches up, so we assume this one's gone.

Documented History (by the NGS)

Unknown by DOD (MONUMENTED)
01/01/1956 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1956 AT BENICIA ARSENAL. AT BENICIA ARSENAL, AT BUILDING 45, 52 FEET NORTH OF AND ACROSS AN ASPHALT STREET FROM THE NORTHWEST CORNER OF BUILDING 52, IN THE TOP OF A CONCRETE RETAINING WALL FOR AN ACCESS WALK TO THE BASEMENT ROOMS, 27 FEET NORTH OF THE CENTER LINE OF THE STREET, 22.6 FEET EAST OF THE NORTHEAST CORNER OF A CONCRETE BRIDGE OVER A NORTH-SOUTH STREET, 8.4 FEET WEST OF THE EAST END OF THE RETAINING WALL, 7.5 FEET SOUTH OF THE SOUTHEAST CORNER OF THE BUILDING, AND ABOUT 1/2 FOOT HIGHER THAN THE STREET.
01/01/1964 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1964 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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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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