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Details for Benchmark: AA2666

N 38° 53.004 W 077° 10.419 (NAD 83)

Altitude: 331.2

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

Location:
In C OF FALLS CHURCH county, VA View Original Datasheet
Designation:
FC GPS 03
Marker Type:
survey disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

Reference Points

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Area was under construction

Found on the way to the Mad Fox Brewery.

The post office has moved farther west on Broad Street, but this mark is still there. It was in a depression next to a square metal pole with an Adopt-a-street sign. Had to clean some dirt off of it but not much. The small building next door that sold coffee is no longer there, but the median strip is obvious.

Much easier the second time around, thanks in great part to better descriptions written by Geocachers than by the professional surveyors.

I'll add my own: Mark is about seven feet NNW of a metal light pole. It is the easternmost of two such poles, and the first one encountered when entering the parking lot from Broad Street. Station disk is also about 6 inches NNW of a two-inch square sign post near the end of a small island jutting into the parking lot. A couple of painted stripes on the curb and adjacent pavement indicate usage as an aerial target.

[Photos:]
photoCloseup, FC GPS 03 (AA2666), Falls Church, VA
photoArea view, FC GPS 03, Falls Church, VA (AA2666)
Post office is behind the photographer. Broad Street is to the left. Note coffee stand, small building, in distance.

It is exactly where it is said to be. I had to dig down through about 3" of mulch but it is there.

The Wulfpack

This disk was found.

In the location instructions, delete the sentence with the parking lot and building measurements and replace with the following:

The station is 91 feet SW along the parking lot curb from the inside of a 3 foot brick wall along the Broad Street sidewalk and then 13 feet NW from the face of the parking lot curb. The station is in a narrow mulched island in the parking lot 2 feet SE from the face of the NW curb end of the island, in the center of its long axis, and 4 inches deep in the mulch. From the Post Office building, the station is 99 feet S from the E corner of the building and 87.9 feet E from the S corner of the building.

[Photos:]
photoat FC GPS 03
The location is in the little island where the blue arrow is pointing.
photoFC GPS 03 in Falls Church City, Virginia
The disk.

It appears this mark should be in the grass across the parking lot from the Falls Church post office, but I could not find it. There were some areas where the grass was quite overgrown, however, and since this is a recently-monumented station, it is likely there for the finding.

I have been here twice and can't find this station. Somewhat surprising because it is AA category.

Documented History (by the NGS)

01/01/1994 by GEOMET (MONUMENTED)
DESCRIBED BY GEOMETRICS GPS INCORPORATED 1994 (DAR) THE STATION IS LOCATED IN THE CITY OF FALLS CHURCH, VIRGINIA. TO REACH THE STATION FROM THE INTERSECTION OF ROUTE 29 (WASHINGTON STREET) AND ROUTE 7 (BROAD STREET) PROCEED NORTHWEST ALONG ROUTE 7 (BROAD STREET) 0.2 MILE (0.3 KM) TO THE FALLS CHURCH POST OFFICE ON THE LEFT. TURN LEFT INTO THE PARKING LOT TO THE STATION ON THE LEFT. THE STATION IS A 3.5 INCH BRASS FAIRFAX COUNTY DISK SET IN THE TOP OF A 10 INCH DIAMETER CONCRETE MONUMENT FLUSH WITH THE GROUND AND IS STAMPED FC GPS NO. 03 1994. THE STATION IS 99.0 FEET (30.2 M) SOUTH FROM THE NORTHEAST CORNER OF THE BUILDING, 87.9 FEET (26.8 M) SOUTHEAST FROM THE SOUTHWEST CORNER OF THE BUILDING, AND 91.6 FEET (27.9 M) SOUTHWEST FROM FACE OF CURB CORNER OF THE PARKING LOT.
03/10/1994 by GEOMET (GOOD)
RECOVERY NOTE BY GEOMETRICS GPS INCORPORATED 1994 THE STATION IS LOCATED IN THE CITY OF FALLS CHURCH, VIRGINIA. TO REACH THE STATION FROM THE INTERSECTION OF ROUTE 29 (WASHINGTON STREET) AND ROUTE 7 (BROAD STREET) PROCEED NORTHWEST ALONG ROUTE 7 (BROAD STREET) 0.2 MILES (0.3 KM) TO THE FALLS CHURCH POST OFFICE ON THE LEFT. TURN LEFT INTO THE PARKING LOT TO THE STATION ON THE LEFT. THE STATION IS A 3.5 INCH BRASS FAIRFAX COUNTY DISK SET IN THE TOP OF A 10 INCH DIAMETER CONCRETE MONUMENT FLUSH WITH THE GROUND AND IS STAMPED FC GPS NO. 03 1994. THE STATION IS 99.0 FEET (30.2 M) SOUTHEAST FROM THE NORTHEAST CORNER OF THE BUILDING, 87.9 FEET (26.8 M) SOUTHEAST FROM THE SOUTHWEST CORNER OF THE BUILDING, AND 91.6 FEET (27.9 M) SOUTHWEST FROM FACE OF CURB CORNER OF THE PARKING LOT.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in May 1995.
  • 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 X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.

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