BM0673 ***********************************************************************
BM0673  DESIGNATION -  W 1221
BM0673  PID         -  BM0673
BM0673  STATE/COUNTY-  TX/TRAVIS
BM0673  USGS QUAD   -  MONTOPOLIS (1988)
BM0673
BM0673                         *CURRENT SURVEY CONTROL
BM0673  ___________________________________________________________________
BM0673* NAD 83(1986)-  30 12 06.     (N)    097 38 15.     (W)     SCALED
BM0673* NAVD 88     -       138.104  (meters)     453.10   (feet)  ADJUSTED
BM0673  ___________________________________________________________________
BM0673  GEOID HEIGHT-         -26.00  (meters)                     GEOID99
BM0673  DYNAMIC HT  -         137.916 (meters)     452.48  (feet)  COMP
BM0673  MODELED GRAV-     979,277.4   (mgal)                       NAVD 88
BM0673
BM0673  VERT ORDER  -  FIRST     CLASS I
BM0673
BM0673.The horizontal coordinates were scaled from a topographic map and have
BM0673.an estimated accuracy of +/- 6 seconds.
BM0673
BM0673.The orthometric height was determined by differential leveling
BM0673.and adjusted by the National Geodetic Survey in June 1991.
BM0673.WARNING-Repeat measurements at this control monument indicate possible
BM0673.vertical movement.
BM0673
BM0673.The geoid height was determined by GEOID99.
BM0673
BM0673.The dynamic height is computed by dividing the NAVD 88
BM0673.geopotential number by the normal gravity value computed on the
BM0673.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
BM0673.degrees latitude (G = 980.6199 gals.).
BM0673
BM0673.The modeled gravity was interpolated from observed gravity values.
BM0673
BM0673;                    North         East    Units  Estimated Accuracy
BM0673;SPC TX C     - 3,062,450.      959,550.      MT  (+/- 180 meters Scaled)
BM0673
BM0673                          SUPERSEDED SURVEY CONTROL
BM0673
BM0673  NGVD 29     -       138.026  (m)          452.84   (f) ADJ UNCH    1 1
BM0673
BM0673.Superseded values are not recommended for survey control.
BM0673.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
BM0673.See file dsdata.txt to determine how the superseded data were derived.
BM0673
BM0673_MARKER: DB = BENCH MARK DISK
BM0673_SETTING: 46 = COPPER-CLAD STEEL ROD W/O SLEEVE (10 FT.+)
BM0673_STAMPING: W 1221 1973
BM0673_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
BM0673
BM0673  HISTORY     - Date     Condition        Recov. By
BM0673  HISTORY     - 1973     MONUMENTED       NGS
BM0673  HISTORY     - 1978     GOOD             NGS
BM0673  HISTORY     - 1989     GOOD             USPSQD
BM0673  HISTORY     - 1989     GOOD             USPSQD
BM0673  HISTORY     - 1991     GOOD             USPSQD
BM0673  HISTORY     - 19980718 GOOD             USPSQD
BM0673
BM0673                          STATION DESCRIPTION
BM0673
BM0673''DESCRIBED BY NATIONAL GEODETIC SURVEY 1973
BM0673''1.45 MI SE FROM DEL VALLE.
BM0673''ABOUT 1.45 MILES SOUTHEAST ALONG STATE HIGHWAY 71 FROM THE MAIN
BM0673''ENTRANCE AND PRESIDENTIAL BLVD. UNDERPASS TO THE BERGSTROM AIRFORCE
BM0673''BASE AT DEL VALLE, 165.0 FEET NORTHEAST OF THE NORTH CORNER OF LA MAR
BM0673''SCHOOL WHICH IS A BRICK BUILDING, 123.0 FEET EAST OF THE CENTER LINE
BM0673''OF FARM ROAD 973, 85.5 FEET SOUTHWEST OF THE CENTER LINE OF THE
BM0673''SOUTHWEST LANE OF ST HIGHWAY 71, 6.4 FEET EAST OF THE EAST CORNER OF A
BM0673''SIDEWALK, 4.5 FEET EAST OF A 24-INCH HACKBERRY TREE, 3.5 FEET
BM0673''NORTHWEST OF A POWER POLE, 0.6 MILES SOUTHEAST OF V 1221, 1.3 FEET
BM0673''SOUTHWEST OF A METAL WITNESS POST AND IS A DISK ON TOP OF A COPPER
BM0673''COATED STEEL ROD FLUSH WITH THE GROUND PROTECTED BY A 6-INCH IRON
BM0673''PIPE.  THE ROD WAS DRIVEN TO A REFUSAL OF 16.0 FEET.
BM0673
BM0673                          STATION RECOVERY (1978)
BM0673
BM0673''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978
BM0673''RECOVERED IN GOOD CONDITION.
BM0673
BM0673                          STATION RECOVERY (1989)
BM0673
BM0673''RECOVERY NOTE BY US POWER SQUADRON 1989 (CGG)
BM0673''RECOVERED IN GOOD CONDITION.
BM0673
BM0673                          STATION RECOVERY (1989)
BM0673
BM0673''RECOVERY NOTE BY US POWER SQUADRON 1989 (CAG)
BM0673''RECOVERED IN GOOD CONDITION.
BM0673
BM0673                          STATION RECOVERY (1991)
BM0673
BM0673''RECOVERY NOTE BY US POWER SQUADRON 1991 (CAG)
BM0673''RECOVERED IN GOOD CONDITION.
BM0673
BM0673                          STATION RECOVERY (1998)
BM0673
BM0673''RECOVERY NOTE BY US POWER SQUADRON 1998
BM0673''RECOVERED IN GOOD CONDITION.