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Details for Benchmark: CZ2170

N 32° 41.407 W 111° 40.323 (NAD 83)

Altitude: 1550.4

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

Location:
In PINAL county, AZ View Original Datasheet
Designation:
AJ 57
Marker Type:
survey disk
Setting:
set into the top of a round concrete monument
Stability:

Reference Points

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Found in good shape.

[Photos:]
photoCZ2170
photoCZ2170 w GPSr

Found in good shape, as described.

[Photos:]
photoCZ2170
photoCZ2170 Wider View
photoCZ2170 Petals

Recovered as described, in good condition.

[Photos:]
photoAJ 57 / CZ2170
A close-up of the mark, with the GPSr.
photoAJ 57 / CZ2170
A close-up of the mark alone.
photoAJ 57 / CZ2170
A wide view of the general area, looking east.

Recovered Station Mark, Reference Mark E, and Reference Mark S in good condition as described with the following update to the description – the Station Mark is flanked on 4 sides by 25 foot concrete petals that form a cross.

To reach the Station from the intersection of I-10 and Sunland Gin Road – take S. Sunland Gin Road South for 8 miles to the Station on the right.

[Photos:]
photoCZ2170 - Benchmark – Pinal County, AZ
photoCZ2170 - RME
photoCZ2170 - RMS
photoCZ2170 – East looking West

Logged this one between Farmer Tom and Mine is a Terrible Thing to Waste.

After finding out about this series of benchmarks in the Casa Grande area, that are similar to the ones near my [url=http://www.geocaching.com/seek/cache_details.aspx?guid=6d6ac28b-2223-4855-ae20-283eecb62368] Lonesome Bush Cache, [/url] we had to come and check them out.

Our final benchmark for the day, and after the running around in the heat, it is probably a good thing we called it quits when we did. We came here from [url=http://www.geocaching.com/mark/details.aspx?PID=CZ2168] CZ2168. [/url] I would have liked to have gone on, but the terrain looked like it was all farmland and most like the crosses and benchmarks down the road were plowed under. We will return and look for more of these benchmarks. Perhaps by then I will have found out more information. I happen to recall the company which did the archaeological survey for the CAP canal. The canal did obliterate a few of the cross benchmarks. They should have historical background on this military project.

Reportedly these benchmarks were for camera alignment and resolution studies. There are others believed to be in the area consisting of lines of different length and some with a bullseye pattern, but I have not found them or seen reports of them as yet.

Did this after doing A Mine is a Terrible Thing To Waste Cache and found this Benchmark before doing AJ-55,AJ-53 and AF-43. First find.

Documented History (by the NGS)

1/1/1966 by DMA (MONUMENTED)
DESCRIBED BY DEFENSE MAP AGENCY 1966 T-8-S. R-6-E. IN SECTION 25 NEAR THE SOUTHEAST CORNER. THE STATION MARK IS A CORPS OF ENGINEERS, U.S. ARMY DISK CENTERED IN THE TOP OF A ROUND CONCRETE POST 8 INCHES IN DIAMETER PROJECTING 0.3 FOOT ABOVE THE SURFACE OF THE GROUND. THE MARK IS STAMPED--AJ 57 1966 ARMY MAP SERVICE. THE STATION MARK IS LOCATED 75 FEET NORTH OF SMALL EAST-WEST DIKE. 81 FEET WEST OF THE CENTERLINE OF NORTH-SOUTH ROAD. 51 FEET WEST OF NORTH-SOUTH FENCE. 53 FEET NORTH OF ASSUMED EAST-WEST SECTION LINE. TO REACH FROM THE JUNCTION OF STATE ROUTES 84 AND 93 IN CASA GRANDE, ARIZONA GO SOUTHEAST ON 84 AND 93 FOR 6.4 MILES TO A ROAD SOUTH. TURN RIGHT AND GO SOUTH FOR 9.2 MILES TO A T TRAIL WEST AND THE STATION SITE. (4.5 MILES SOUTH OF THE ARIZONA CITY POST OFFICE)

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in August 1993.
  • 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 Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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