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Details for Benchmark: EV2479

N 34° 09.083 W 117° 59.667 (NAD 83)

Altitude: 623.3

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

Location:
In LOS ANGELES county, CA View Original Datasheet
Designation:
A 13
Marker Type:
bench mark disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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If you stare at it long enough you realize the zip code here is the same upside-down.

[Photos:]
photo

Recovered this benchmark successfully as described. Mark is in good condition.

[Photos:]
photoEV2479

My first benchmark! The longitude was a bit off; should be more like W 177 degrees, 59.693 minutes.

[This entry was edited by wkiri on Friday, September 12, 2008 at 11:05:50 PM.]

Documented History (by the NGS)

1/1/1923 by USGS (MONUMENTED)
1/1/1931 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1931 AT MONROVIA. 25 FEET SOUTH AND 30 FEET EAST OF INTERSECTION OF CALIFORNIA AVE. AND FOOTHILL BLVD.

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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.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