JW1712 ***********************************************************************
JW1712  DESIGNATION -  SHA 218
JW1712  PID         -  JW1712
JW1712  STATE/COUNTY-  MD/GARRETT
JW1712  USGS QUAD   -  GRANTSVILLE (1994)
JW1712
JW1712                         *CURRENT SURVEY CONTROL
JW1712  ___________________________________________________________________
JW1712* NAD 83(1986)-  39 41 37.     (N)    079 10 16.     (W)     SCALED
JW1712* NAVD 88     -       696.540  (meters)    2285.23   (feet)  ADJUSTED
JW1712  ___________________________________________________________________
JW1712  GEOID HEIGHT-         -31.51  (meters)                     GEOID99
JW1712  DYNAMIC HT  -         696.094 (meters)    2283.77  (feet)  COMP
JW1712  MODELED GRAV-     979,961.7   (mgal)                       NAVD 88
JW1712
JW1712  VERT ORDER  -  SECOND    CLASS I
JW1712
JW1712.The horizontal coordinates were scaled from a topographic map and have
JW1712.an estimated accuracy of +/- 6 seconds.
JW1712
JW1712.The orthometric height was determined by differential leveling
JW1712.and adjusted by the National Geodetic Survey in April 1995.
JW1712
JW1712.The geoid height was determined by GEOID99.
JW1712
JW1712.The dynamic height is computed by dividing the NAVD 88
JW1712.geopotential number by the normal gravity value computed on the
JW1712.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
JW1712.degrees latitude (g = 980.6199 gals.).
JW1712
JW1712.The modeled gravity was interpolated from observed gravity values.
JW1712
JW1712;                    North         East    Units  Estimated Accuracy
JW1712;SPC MD       -   227,230.      213,780.      MT  (+/- 180 meters Scaled)
JW1712
JW1712                          SUPERSEDED SURVEY CONTROL
JW1712
JW1712.No superseded survey control is available for this station.
JW1712
JW1712_MARKER: DD = SURVEY DISK
JW1712_SETTING: 38 = BRIDGE ABUTMENT
JW1712_STAMPING: SHA 218 1992
JW1712_MAGNETIC: O = OTHER; SEE DESCRIPTION
JW1712_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
JW1712
JW1712  HISTORY     - Date     Condition        Recov. By
JW1712  HISTORY     - 1992     MONUMENTED       MDSHA
JW1712
JW1712                          STATION DESCRIPTION
JW1712
JW1712''DESCRIBED BY MARYLAND DOT HIGHWAY ADMINISTRATION 1992
JW1712''THE MARKER IS LOCATED ABOUT 4.1 MI (6.6 KM) EAST OF KEYSERS RIDGE,
JW1712''0.9 MI (1.4 KM) WEST-SOUTHWEST OF GRANTSVILLE, AND 9.1 MI (14.6 KM)
JW1712''EAST-NORTHEAST OF ACCIDENT.  IT IS LOCATED ON INTERSTATE HIGHWAY 68
JW1712''RIGHT-OF-WAY.  TO REACH FROM A POINT WHERE STATE HIGHWAY 495 CROSSES
JW1712''OVER INTERSTATE HIGHWAY 68 NEAR GRANTSVILLE, GO WEST ON INTERSTATE
JW1712''HIGHWAY 68 FOR 0.65 MI (1.05 KM) TO THE MARKER ON THE LEFT.  THE
JW1712''POINT IS MARKED WITH A MARYLAND STATE HIGHWAY ADMINISTRATION SURVEY
JW1712''DISK, CEMENTED IN A DRILL HOLE ON THE SOUTH END OF A BACKWALL WHICH
JW1712''IS PART OF THE WEST ABUTMENT OF A BRIDGE NUMBERED 11050 WHERE THE
JW1712''EASTBOUND LANE OF INTERSTATE HIGHWAY 68 CROSSES OVER SHADE HOLLOW
JW1712''ROAD.  IT IS 0.7 FT (21.3 CM) WEST OF THE MOST WEST BRIDGE EXPANSION
JW1712''JOINT, 2.0 FT (0.6 M) NORTHEAST OF THE NORTH EDGE OF THE SOUTH BRIDGE
JW1712''PARAPET WALL, 9.5 FT (2.9 M) SOUTHEAST OF THE NORTHWEST END OF THE
JW1712''SOUTH BRIDGE PARAPET WALL 19.5 FT (5.9 M) SOUTHWEST FROM THE CENTER
JW1712''OF THE EASTBOUND LANE OF INTERSTATE HIGHWAY 68, AND 20.9 FT (6.4 M)
JW1712''SOUTHEAST FROM THE CENTER OF A DROP INLET.  IT IS ABOUT THE SAME
JW1712''ELEVATION AS THE SURFACE OF THE HIGHWAY.