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Details for Benchmark: EV2774

N 34° 06.833 W 117° 49.550 (NAD 83)

Altitude: 891.49

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

Location:
In LOS ANGELES county, CA View Original Datasheet
Designation:
C 96
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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recovered this benchmark with TheeDragon. I had a good idea where it was and walked right up to it.

[Photos:]
photoEV2774
N 34° 06.829 W 117° 49.568

Found this benchmark with Unsanctified. Benchmark is still in good shape. Coords were off. My GPS had it at N 34° 06.829 W 117° 49.568. [br][br][font=georgia][size=3][i][b][red]Thee[/red][green]Dragon[/green][/b][/i][/size]

[Photos:]
photo20130922_201618-EV2774-C_96

Recovered as described. Squeezed in the find before going to work for the day at an environmental test lab in the general area.

[Photos:]
photoEV2774 Disc closeup near Covina CA
photoEV2772 area, near Covina CA

South side of Gladstone just east of R.R. tracks between Lone Hill Ave. and the freeway over pass.

[Photos:]
photoEV2774
Close up

Documented History (by the NGS)

01/01/1931 by CGS (MONUMENTED)
01/01/1934 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1934 1.2 MI NW FROM SAN DIMAS. 1.2 MILES NORTHWEST OF SAN DIMAS, LOS ANGELES COUNTY, AT INTERSECTION OF SANTA FE R.R. AND GLADSTONE AVENUE, 25 FEET EAST OF THE CENTER OF THE TRACK, AND 42 FEET SOUTH OF CENTER OF GLADSTONE AVENUE. A STANDARD DISK, SET IN THE TOP OF A CONCRETE CULVERT HEADWALL.
01/01/1968 by CA-037 (GOOD)
RECOVERY NOTE BY LOS ANGELES COUNTY CALIFORNIA 1968 RECOVERED IN GOOD CONDITION.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in February 1993. * This is a READJUSTED BENCH MARK height. Code A indicates a distribution rate of 0.0 thru 1.0 mm/km. The height was derived from older observations constrained to new heights in a crustal motion area. The height is approximate in relation to other heights in its vicinity.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (G = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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