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Details for Benchmark: HS3507

N 37° 41.867 W 121° 47.267 (NAD 83)

Altitude: 437.8

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

Location:
In ALAMEDA county, CA View Original Datasheet
Designation:
Q 929 RESET 1973
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Found where described

[Photos:]
photoeye level

Found Q929 RESET 1973 as described and in good shape. The coordinates posted by Low594 are quite good.

Bench mark was in good shape.

[Photos:]
photoBenchmark Q929
Right on the drain.
photoSidewalk
Gotta love the construction cone. I wonder how long it will stay there?

This is the first benchmark I found by myself... well, with the help of the photos of previous finders. Now to figure out how to upload a picture...

[Photos:]
photoLivermore, California
I'll try to get a better angle on my batty friend next time.
N 37° 41.929 W 121° 47.344

Easy, as said previously, look for the boat shop across the way.

[Photos:]
photoIMG_0487
photoIMG_0486

The posted coords were a little off, we used the coords below. Our favorite store is just across the street (Malibu). We are using this fopr requirement #11B for the Orient Express.

N 37° 41.929 W 121° 47.346

Easy find across from the boat store.

[Photos:]
photoHS 3507 Q929

Documented History (by the NGS)

01/01/1973 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1973 1.5 MI NW FROM LIVERMORE. 0.7 MILE NORTH ALONG L STREET FROM THE SOUTHERN PACIFIC COMPANY RAILROAD STATION AT LIVERMORE, THENCE 0.8 MILE NORTHWEST ALONG PORTOLA AVENUE, IN THE SOUTH 1/2 OF SEC. 6, T 3 S, R 2 E, 170 YARDS NORTHWEST OF THE ENTRANCE TO THE SUN VALLEY MOBILE ESTATES, ABOUT 60 YARDS SOUTH OF THE EAST-BOUND LANES OF INTERSTATE HIGHWAY 580, IN THE TOP OF THE CONCRETE CURB ABOVE A 2 X 3-FOOT CATCH BASIN, 34.0 FEET SOUTHWEST OF THE CENTER LINE OF THE AVENUE, 9.5 FEET NORTHEAST OF A BOARD FENCE, 0.5 FOOT SOUTH OF THE SOUTH CORNER OF THE CATCH BASIN AND ABOUT LEVEL WITH THE AVENUE.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (LK) 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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