ME1728 ***********************************************************************
ME1728  DESIGNATION -  PBM 115
ME1728  PID         -  ME1728
ME1728  STATE/COUNTY-  IL/COOK
ME1728  USGS QUAD   -  SAG BRIDGE (1997)
ME1728
ME1728                         *CURRENT SURVEY CONTROL
ME1728  ___________________________________________________________________
ME1728* NAD 83(1986)-  41 40 44.     (N)    087 59 59.     (W)     SCALED
ME1728* NAVD 88     -       179.667  (meters)     589.46   (feet)  ADJUSTED
ME1728  ___________________________________________________________________
ME1728  GEOID HEIGHT-         -33.15  (meters)                     GEOID99
ME1728  DYNAMIC HT  -         179.601 (meters)     589.24  (feet)  COMP
ME1728  MODELED GRAV-     980,252.2   (mgal)                       NAVD 88
ME1728
ME1728  VERT ORDER  -  FIRST     CLASS II
ME1728
ME1728.The horizontal coordinates were scaled from a topographic map and have
ME1728.an estimated accuracy of +/- 6 seconds.
ME1728
ME1728.The orthometric height was determined by differential leveling
ME1728.and adjusted by the National Geodetic Survey in June 1991.
ME1728
ME1728.The geoid height was determined by GEOID99.
ME1728
ME1728.The dynamic height is computed by dividing the NAVD 88
ME1728.geopotential number by the normal gravity value computed on the
ME1728.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
ME1728.degrees latitude (g = 980.6199 gals.).
ME1728
ME1728.The modeled gravity was interpolated from observed gravity values.
ME1728
ME1728;                    North         East    Units  Estimated Accuracy
ME1728;SPC IL E     -   556,490.      327,780.      MT  (+/- 180 meters Scaled)
ME1728
ME1728                          SUPERSEDED SURVEY CONTROL
ME1728
ME1728  NGVD 29     -       179.756  (m)          589.75   (f) ADJ UNCH    1 2
ME1728
ME1728.Superseded values are not recommended for survey control.
ME1728.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
ME1728.See file dsdata.txt to determine how the superseded data were derived.
ME1728
ME1728_MARKER: B = BOLT
ME1728_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
ME1728_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
ME1728+STABILITY: SURFACE MOTION
ME1728
ME1728  HISTORY     - Date     Condition        Recov. By
ME1728  HISTORY     - UNK      MONUMENTED       CGS
ME1728  HISTORY     - 1947     GOOD             NGS
ME1728
ME1728                          STATION DESCRIPTION
ME1728
ME1728''DESCRIBED BY NATIONAL GEODETIC SURVEY 1947
ME1728''AT LEMONT.
ME1728''AT LEMONT, COOK COUNTY, AT THE ATCHISON, TOPEKA AND SANTA FE
ME1728''RAILWAY BRIDGE OVER THE CHICAGO DRAINAGE CANAL, IN THE WING WALL
ME1728''OF THE SOUTH ABUTMENT, IN THE TOP OF THE WEST END STONE OF THE
ME1728''SECOND COURSE ABOVE THE GROUND, 2.2 FEET FROM THE WEST END OF THE
ME1728''STONE, AND 1.1 FEET BACK FROM THE FACE OF THE WING WALL.  THE
ME1728''TOP OF A COPPER BOLT LEADED VERTICALLY IN THE STONE AND SURROUNDED
ME1728''BY THE LETTERS USPBM.