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Details for Benchmark: HV9026

N 38° 44.535 W 077° 30.771 (NAD 83)

Altitude: 190

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

Location:
In PRINCE WILLIAM county, VA View Original Datasheet
Designation:
E
Marker Type:
alumnium marker (other than a disk)
Setting:
driven into the ground
Stability:
Mark of questionable or unknown stability.

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Did not find the benchmark but I did find the witness post, so I photographed that. Should make it easier to locate after the swamp drains. It was just wayyyy too wet to find the station today. My GPS coordinates of the witness post are:
N38 44.534 W077 30.770.

[Photos:]
photoHV9026 general area and witness post

This station was found. It is about 3 inches below the general surface, but was found exposed in a small water channel. The 14-inch ash tree is gone and the 8-inch stump is gone. The station is 48 feet South of a 14-inch ash tree that is covered by poison ivy.

[Photos:]
photoStation E i n Prince William County, Virginia
The disk.
photoAt station E i n Prince William County, Virginia
The disk is in the lower center of the picture between the stake and the yellow compass. The ash tree is in the background. A surveyor marked the station sometime after Artman searched the area.

If I understood the description - and it conforms to the readings from my GPS receiver - this station is some 20 yards outside the cemetery grounds in a marshy, overgrown, bramble-filled area. The last recovery, in January 1987, was in winter, and maybe that's the time to go, because it was pretty impenetrable in summer.

[Photos:]
photoGeneral area where HV9026 is believed to be, Manassas, VA

Documented History (by the NGS)

01/01/1986 by LOCENG (MONUMENTED)
DESCRIBED BY LOCAL ENGINEER (INDIVIDUAL OR FIRM) 1986 THE STATION IS LOCATED IN CENTRAL PRINCE WILLIAM COUNTY VIRGINIA. TO REACH THE STATION FROM THE INTERSECTION OF ROUTE 234 AND ROUTE 28 IN THE CITY OF MANASSAS VIRGINIA. PROCEED WEST ON ROUTE 28 FOR 2.2 MILES TO THE INTERSECTION WITH GODWIN DRIVE, TURN LEFT AND HEAD SOUTH-SOUTHWEST ON GODWIN DRIVE FOR 0.1 MILE TO THE CEMETERY ON THE RIGHT. STATION E LIES 61.8 FEET AT AN AZIMUTH OF 260 DEGREES FROM THE SOUTHWEST CORNER OF THE CEMETARY STONE WALL BOUNDARY. THE STATION IS A BRASS CAP 2-INCH IN DIAMETER SET IN CONCRETE STAMPED---STA E---. THE STATION IS 105.5 FEET SOUTHEAST OF A PK NAIL IN A 14-INCH ASH TREE, 15.9 FEET SOUTHWEST OF A PK NAIL IN THE EAST SIDE OF A 8-INCH STUMP, 61.8 FEET SOUTH OF THE CENTER OF THE SOUTHWEST CORNER PEDESTAL OF THE CEMETERYS STONE WALL, AND 82.5 FEET NORTH OF A PK NAIL IN THE SOUTH SIDE OF A POWER POLE. THE AZIMUTH MARK IS A BRASS DISK SET IN A MASS OF CONCRETE, AND IS STAMPED---83 E PWC AZIMUTH 1986---.THE MARK IS 52.00 FEET EAST OF THE CENTERLINE OF GOODWIN DRIVE, 42.05 FEET NORTH OF THE CENTERLINE OF ROUTE 28, AND 2.5 FEET EAST OF POWER POLE OK72. THE DISTANCE FROM THE AZIMUTH MARK TO THE STATION IS 297.1 METERS. TO REACH THE AZIMUTH MARK FROM THE STATION, PROCEED NORTHWEST ON GOODWIN DRIVE FOR 0.2 MILES TO THE MARK IN THE NORTHEAST CORNER OF THE INTERSECTION OF GOODWIN DRIVE AND ROUTE 28.
01/16/1987 by (GOOD)
RECOVERED 1987 RECOVERED IN GOOD CONDITION.

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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