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Details for Benchmark: JT2189

N 38° 06.345 W 122° 13.781 (NAD 83)

Altitude: 39

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

Location:
In SOLANO county, CA View Original Datasheet
Designation:
SPRINGS
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

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Documented History (by the NGS)

01/01/1959 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1959 (JCM) THE STATION IS LOCATED ON THE SOUTH SIDE OF THE SPRINGS ROAD OVERCROSSING (OVER THE U.S. HIGHWAY 40 FREEWAY) IN THE EAST CENTRAL PART OF VALLEJO, AIRLINE ABOUT 1-1/2 MILES EAST OF THE CITY HALL. TO REACH THE STATION FROM THE POST OFFICE IN VALLEJO GO SOUTH ON MARIN STREET 0.2 MILE TO AN INTERSECTION. TURN LEFT ONTO GEORGIA STREET AND GO EAST 0.9 MILE TO AN INTERSECTION. TURN LEFT ONTO SOLANO AVENUE AND GO NORTHEAST 0.6 MILE TO THE SPRINGS ROAD OVERCROSSING AND THE STATION. THE STATION MARK IS A STNADARD DISK STAMPED SPRINGS 1959 CEMENTED IN A DRILL HOLE IN THE TOP OF THE CONCRETE SIDEWALK ON THE SOUTH SIDE OF THE OVERCROSSING. IT IS OVER THE CENTER PIER OF THE OVERCROSSING AND IS 16.5 FEET SOUTH OF THE CENTERLINE OF THE EAST-BOUND LANE OF THE ROAD, 2.1 FEET SOUTH OF THE FACE OF THE CURB, AND 1.1 FEET WEST OF AN EXPANSION JOINT. REFERENCE MARK NUMBER 1 IS A STANDARD DISK STAMPED SPRINGS NO 1 1959 CEMENTED IN A DRILL HOLE IN THE TOP OF THE CONCRETE ISLAND IN THE CENTER OF THE OVERCROSSING. IT IS ABOUT 1 FOOT HIGHER THAN THE STATION. REFERENCE MARK NUMBER 2 IS A STANDARD DISK STAMPED SPRINGS NO 2 1959 CEMENTED IN A DRILL HOLE IN THE TOP OF THE SIDEWALK ON THE SOUTH SIDE OF THE OVERCROSSING. IT IS 4.6 FEET SOUTH OF THE FACE OF THE CURB AND ABOUT THE SAME ELEVATION AS THE STATION.
01/01/1963 by LOCENG (MONUMENTED)
RECOVERY NOTE BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1963 RECOVERED BY J.P. BERRY. STATION AND REFERENCE MARKS FOUND IN EXCELLENT CONDITION. DESCRIPTION ADEQUATE.
01/01/1987 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1987 (TM) RECOVERED IN GOOD CONDITION.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (TS) RECOVERED IN GOOD CONDITION.

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 orthometric height was scaled from a topographic map.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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