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Details for Benchmark: JT2124

N 38° 02.019 W 122° 06.935 (NAD 83)

Altitude: 0

Coordinates may not be exact. Altitude is UNKNOWN and location is ADJUSTED. (more info)

Location:
In CONTRA COSTA county, CA View Original Datasheet
Designation:
STAUFFER CHEMICAL CO STK 1977
Marker Type:
stack
Setting:
setting not listed - see description
Stability:

Must Read!

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Oaknest and I spotted the stack benchmark while geocaching.

[Photos:]
photoStack Benchmark

Drove by really fast and saw this one.

[Photos:]
photoStack

Documented History (by the NGS)

01/01/1977 by NGS (FIRST OBSERVED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1977 (CA) THE STATION IS A 208 FOOT STACK ON BULLS HEAD POINT AT THE EASTERN END OF CARQUINEZ STRAIT AND AT THE SOUTH END OF THE BENICIA BRIDGE. IT IS 1.3 N.M. NORTHEAST OF MARTINEZ. THE STACK IS CREAM COLORED AND TOPPED BY A SILVER METAL CONE. IT IS OWNED BY THE STAUFFER CHEMICAL COMPANY OF MARTINEZ. THE CENTER TOP OF THE CONE WAS INTERSECTED.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in March 1994. The horizontal coordinates are valid at the epoch date displayed above. The epoch date for horizontal control is a decimal equivalence of Year/Month/Day.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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