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Details for Benchmark: HV9301

N 38° 43.417 W 077° 48.312 (NAD 83)

Altitude: 548

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

Location:
In FAUQUIER county, VA View Original Datasheet
Designation:
TW02
Marker Type:
triangulation station disk
Setting:
set into the top of a round concrete monument
Stability:
Most reliable and expected to hold position/elevation well.

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Saw this benchmark while caching in the area with Schwandt.

[Photos:]
photoHV9301
photoHV9301 Area

Found in good condition.

[Photos:]
photoClose up of benchmark
photoIn its new surroundings

A quick find about 7 feet from U.S 29-211 next to a reasonable sized oak tree. Area has changed since the earlier photos were taken.

Easy find. Stamped TW002, just like the last person indicated.

Located as described, except gas station is now Exxon.

Note that the station stamping is different from that given on the datasheet (TW02 1992). The actual stamping reads GPS 1/8/92 TW 002. (This disk, and others in this TWxx series, appear to be factory-stamped, and there is no evidence of the crude, uneven stamping typical of generic disks stamped in the field.)

[last edit: 12/26/2003 8:10:18 PM PST]

[Photos:]
photoCloseup of station TW02, Warrenton, VA
photoView along Rt. Business 15; station TW02 indicated at arrow

Documented History (by the NGS)

01/01/1992 by VA2570 (MONUMENTED)
DESCRIBED BY CITY OF WARRENTON VIRGINIA 1992 THE STATION IS LOCATED APPROX. 1.0 MILE WEST OF THE CENTER OF THE CITY OF WARRENTON, VIRGINIA, IN A GRASSY AREA BETWEEN THE ROAD AND SIDEWALK IN FRONT OF THE CHEVRON GAS STATION. TO REACH THE STATION FROM THE INTERSECTION OF STATE ROUTES 211 AND BUSINESS 15 IN SOUTHWEST WARRENTON, PROCEED NORTH ON BUSINESS 15 FOR APPROX. 0.4 MILE TO THE STATION ON THE LEFT, WEST, AT THE ENTRANCE TO THE CHEVRON GAS STATION. DRIVE INTO THE FRONT PARKING AREA OF THE GAS STATION TO A POINT BETWEEN THE ROAD, THE SIDEWALK, AND PARKING AREA. THE MARK IS LOCATED AT THE CENTERLINE OF THE GRASSY AREA BETWEEN THE ROAD AND THE SIDEWALK. THE MARK IS EIGHT (8) FEET WEST OF THE WEST EDGE OF ROUTE 15, FIFTY FIVE (55) NORTH OF THE SOUTH EDGE OF THE GRASSY ISLAND, AND FORTY SEVEN POINT FIVE (47.5) FEET SOUTH OF THE NORTH EDGE OF THE GRASSY ISLAND, SIX (6) FEET EAST OF THE EAST EDGE OF THE SIDEWALK. THE MARK IS A STANDARD BRASS CAP SET IN THE CENTER OF A ROUND CONCRETE MASS FLUSH WITH THE SURFACE AND STAMPED TW02 1992 TOWN OF WARRENTON GPS.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in November 1994.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • 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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