Skip to Content

Details for Benchmark: HS4080

N 37° 42.067 W 121° 53.317 (NAD 83)

Altitude: 344.1

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

Location:
In ALAMEDA county, CA View Original Datasheet
Designation:
C 994 RESET
Marker Type:
bench mark disk
Setting:
copper-clad steel rod
Stability:
Probably hold position/elevation well.

Must Read!

Benchmarks may be on private property or in dangerous locations. Obey local laws. By using the services on Geocaching.com you agree to this disclaimer.

Documented History (by the NGS)

01/01/1974 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1974 4.3 KM (2.65 MI) EAST FROM DUBLIN. 2.65 MILES EAST ALONG INTERSTATE HIGHWAY 580 FROM THE JUNCTION OF FOOTHILL ROAD IN DUBLIN, AT THE SOUTHEAST END OF A GROUP OF WAREHOUSES, 180 FEET NORTH OF THE NORTH MOST CENTERLINE OF THE WEST BOUND LANES OF INTERSTATE HIGHWAY 580, 106.5 FEET NORTH OF THE CENTERLINE OF THE FRONTAGE ROAD, 91.6 FEET SOUTHWEST AND ACROSS THE TRACKS FROM THE SOUTHWEST CORNER OF A WAREHOUSE, 33.6 FEET SOUTHEAST OF THE SOUTHEAST END OF THE FOUNDATION OF A WAREHOUSE, 32.5 FEET NORTHWEST OF THE CENTERLINE OF A ASPHALT ROAD, 1.5 FEET WEST OF POWERLINE POLE NO. 1-11, 3 FEET WEST OF A METAL WITNESS POST, A DISK ON TOP OF A 5/8-INCH COPPER COATED STEEL ROD DRIVEN TO REFUSAL AT DEPTH OF 88 FEET, THE UPPER PORTION OF THE ROD IS ENCASED IN CONCRETE AROUND A 4-INCH PLASTIC PIPE FLUSH WITH THE GROUND. C 994 N IS A PORTION OF THE COPPER COATED ROD IN TOP OF THE CONCRETE POST SURROUNDING THE ROD.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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

Advertising with Us

Return to the Top of the Page