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Details for Benchmark: HV8604

N 38° 47.759 W 077° 23.768 (NAD 83)

Altitude: 394

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

Location:
In FAIRFAX county, VA View Original Datasheet
Designation:
POPES
Marker Type:
survey disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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The description indicates this station is on private property, so I did not try to search for it.

Documented History (by the NGS)

01/01/1969 by VA-059 (MONUMENTED)
DESCRIBED BY FAIRFAX COUNTY VIRGINIA 1969 (HWC) THE STATION IS 1.2 MILES NORTHWEST OF CLIFTON. TO REACH THE STATION FROM CLIFTON PROCEED NORTHWEST ON ROUTE 645, 1.3 MILES TO ENTRANCE TO HORSE FARM ON LEFT. STATION IS ON TOP OF BALD HILL, 12.0 FEET WEST OF A LARGE BOULDER, SET IN A SMALL ROCK. STATION IS A STANDARD FAIRFAX COUNTY DISK STAMPED---POPES 1969---.
01/01/1969 by VA-059 (GOOD)
RECOVERY NOTE BY FAIRFAX COUNTY VIRGINIA 1969 RECOVERED IN GOOD CONDITION.
01/01/1975 by VA-059 (GOOD)
RECOVERY NOTE BY FAIRFAX COUNTY VIRGINIA 1975 (EYB) THE STATION WAS RECOVERED IN GOOD CONDITION. SEE FAIRFAX COUNTY TAX MAP 75-1, REVISED TO 1-1-76.
01/01/1977 by VA-059 (GOOD)
RECOVERY NOTE BY FAIRFAX COUNTY VIRGINIA 1977 (EYB) THE STATION WAS RECOVERED IN GOOD CONDITION PER ORIGINAL DESCRIPTION.
01/28/1992 by MSI (GOOD)
RECOVERY NOTE BY MEASUREMENT SCIENCE INCORPORATED 1992 THE STATION IS 1.2 MILES (1.9 KM) NORTHWEST OF CLIFTON. TO REACH THE STATION FROM CLIFTON PROCEED NORTHWEST ON ROUTE 645, 1.3 MILES (2.1 KM) TO ENTRANCE TO HORSE FARM ON LEFT. STATION IS ON TOP OF BALD HILL, 12.0 FEET (3.7 M) WEST OF A LARGE BOULDER, SET IN A SMALL ROCK. SEE FAIRFAX COUNTY TAX MAP 75-1, REVISED TO 1-1-76.

Control Text

  • The horizontal coordinates were established by classical geodetic methods 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  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)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 Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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