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Details for Benchmark: AB9343

N 33° 55.483 W 117° 54.583 (NAD 83)

Altitude: 370.13

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

Location:
In ORANGE county, CA View Original Datasheet
Designation:
44 OJA RESET
Marker Type:
bench mark disk
Setting:
footings/foundation walls of small/medium structures
Stability:
May hold, but of type commonly subject to surface motion.

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Recovered as described. Got some better pictures than Tigger2. An "Air Release", huh? I wonder if they might have meant "Air Relief"?

[Photos:]
photoAB9343 Wide view in Brea, CA
The tall gizmo is called an "Air Release" by the Metro Water folks.
photoAB9343 Area in Brea, CA
photoAB9343 Disk in Brea, CA

Good directions to this one made it easy. And now I know what the heck an Air Release is. Yesterdays rain made a mess of the streets and sidewalks, putting lots of tree debris all over most of the disks making them a bit hard to find. That's OK though, it just adds to the fun of the hunt.
This 'mark and AB9344 proved to me that the coordinates given on these pages is not to be trusted. They show them as AB 9344 being east of AB 9343 and they are just the opposite! By close to half a mile. A Thomas Brothers map sure does help. Tigger 2

[Photos:]
photoLooking west along Lambert
So this is an "Air Release"????!!!
photoClose up of the disk
It's pretty fuzzy so I'll reshoot it later.
photoTigger with the disk

Documented History (by the NGS)

01/01/1994 by MWDSC (MONUMENTED)
DESCRIBED BY METRO WATER DISTR SO. CALIFORNIA 1994 (JDG) BREA,CA ON LAMBERT RD. APPROX. 210 FEET (64.0 M) EASTERLY OF DELTA AVE. AND 44 FEET (13.4 M) NORTH OF LAMBERT RD. ON THE SOUTH EASTERLY CORNER OF CONCRETE FOOTING OF MWD AIR RELEASE STRUCTURE LOCATED AT STATION 1596+00, 23 FEET (7.0 M) WESTERLY OF POWER POLE NO.2134631E. SET A 1-3/8 INCH BRASS DISK STAMPED MWD BM 44OJA RESET 1994 SET FLUSH IN CONCRETE FOOTING OF MWD AIR RELEASE STRUCTURE. REFERENCE MWD FB 2016 01 037.

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 1997.
  • 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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