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Details for Benchmark: HS3503

N 37° 41.017 W 121° 45.917 (NAD 83)

Altitude: 494.4

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

Location:
In ALAMEDA county, CA View Original Datasheet
Designation:
M 832
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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My first benchmark. It's located in the middle of 2nd St. at the intersection of Old 1st St. in Livermore, presumably under a handhole labeled "Monument". I didn't try to lift the lid to verify that I had the right one. The GPS coordinates given in geocaching.com are accurate. I looked up a 1961 topo map on the USGS website that showed the Southern Pacific tracks right where 1st St. is now. Since then, the SP was relocated a block or so to the northwest right next to the Western Pacific track through Livermore. The Union Pacific bought the Western Pacific and made numerous improvements. A bit later, UP merged with SP, and the SP line through Livermore was rebuilt as a second track of the UP. 1st St. was relocated to its present location and the grade crossing where 1st St. crossed the two railroads was replaced by an overpass further out 1st St. As far as I can tell, none of the landmarks in the Documented History at http://www.geocaching.com/mark/details.aspx?PID=HS3503 is still there.

This entry was edited by gg14800 on Thursday, 25 June 2015 at 16:04:33 UTC.

[Photos:]
photoView of intersection 2nd St. and Old 1st St.
Location of monument, presumably M 832, shown.
photoHandhole cover in the middle of 2nd St at Old 1st
This handhole is at the GPS coordinates given for M 832.

Searched for it 08:30, 25 January 2015. The benchmark was not located but may remain in place. Most of the described ties to the benchmark have been removed however, a corrugated metal building can be found at the approximate location of the coordinates. It is unknown if the westerly corner of the corrugated building is the original westerly corner of the corrugated metal building, or if a portion of it has been removed. The area has been groomed with gravel, and the corrugated metal siding comes all the way to the ground. No concrete foundation can be seen, however it may still exist and the mark may still be intact.

However, this building lies southeast of First Street. The goto description for the mark says it lies 200 feet northwest of First Street and 37 feet southeast of the rails. The only place where First Street and the rails are 237 feet apart is about 700 feet north of the metal building found at the coordinate location.

No new coordinates were taken.

Keep on Caching!
- Kewaneh

This entry was edited by Kewaneh & Shark on Tuesday, 10 February 2015 at 01:47:32 UTC.

[Photos:]
photoHS3503-001
HS3503 "M 832" - Benchmark setting: "corrugated metal building". View west across Old First Street.
photoHS3503-002
HS3503 "M 832" - Benchmark setting: "corrugated metal building". View southerly at the northerly corner of the building.
photoHS3503-004
HS3503 "M 832" - Benchmark setting: "corrugated metal building". View southeasterly at the northwest face of the building.
photoHS3503-006
HS3503 "M 832" - Benchmark setting: view behind the gate. The metal siding touches the ground; no concrete foundation is exposed.
photoHS3503-103
HS3503 "M 832" - This is the only place where First Street and the rails are approximately 237 feet apart. There is no building, or wooden box culvert under the railroad, in the area matching those described in the benchmark datasheet.
photoHS3503-102
HS3503 "M 832" - This is the only place where First Street and the rails are approximately 237 feet apart. There is no building, or wooden box culvert under the railroad, in the area matching those described in the benchmark datasheet.
photoHS3503-101
HS3503 "M 832" - The mark is described as 200' northwest of First Street and 37' southeast of the southeast rail. The coordinate location and metal sided building near the location, are southeast of First Street. It's not the correct building.

Very new to the benchmark thing. Found corrugated metal building. If they meant the foundation of that building, no idea where it was. Could not find. If someone has a picture, would love to see it for a hint.

I circled it three times to be sure.

Documented History (by the NGS)

01/01/1947 by CGS (MONUMENTED)
01/01/1958 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1958 AT LIVERMORE. AT LIVERMORE, IN R2E T3S S9, ALONG THE SOUTHERN PACIFIC COMPANY RAILROAD, 200 FEET NORTHEAST OF THE NORTHEAST CURB OF EAST FIRST STREET, 37 FEET SOUTHEAST OF THE SOUTHEAST RAIL OF THE MAIN TRACK, 30 FEET SOUTHEAST OF THE SOUTHEAST END OF A WOODEN BOX CULVERT UNDER THE RAILROAD, AT THE WEST CORNER OF A LARGE CORRUGATED METAL BUILDING (FORMERLY THE CENTRAL CALIFORNIA POULTRY COMPANY), SET VERTICALLY IN THE NORTHWEST CONCRETE FACE OF THE FOUNDATION, 6 FEET NORTHEAST OF THE WEST CORNER OF THE FOUNDATION, AND ABOUT 0.2 FOOT ABOVE THE GROUND.
01/01/1974 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974 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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