National Geodetic Survey, Retrieval Date = JANUARY 1, 2003 DX4890 *********************************************************************** DX4890 DESIGNATION - COOLIDGE DX4890 PID - DX4890 DX4890 STATE/COUNTY- CA/IMPERIAL DX4890 USGS QUAD - OASIS (1974) DX4890 DX4890 *CURRENT SURVEY CONTROL DX4890 ___________________________________________________________________ DX4890* NAD 83(1992)- 33 22 56.15861(N) 116 04 38.03385(W) ADJUSTED DX4890* NAVD 88 - 684.2 (meters) 2245. (feet) VERTCON DX4890 ___________________________________________________________________ DX4890 EPOCH DATE - 1991.35 DX4890 LAPLACE CORR- -8.97 (seconds) DEFLEC99 DX4890 GEOID HEIGHT- -33.26 (meters) GEOID99 DX4890 DX4890 HORZ ORDER - FIRST DX4890 DX4890.The horizontal coordinates were established by classical geodetic methods DX4890.and adjusted by the National Geodetic Survey in June 1996. DX4890.The horizontal coordinates are valid at the epoch date displayed above. DX4890.The epoch date for horizontal control is a decimal equivalence DX4890.of Year/Month/Day. DX4890 DX4890.The NAVD 88 height was computed by applying the VERTCON shift value to DX4890.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) DX4890 DX4890.The Laplace correction was computed from DEFLEC99 derived deflections. DX4890 DX4890.The geoid height was determined by GEOID99. DX4890 DX4890; North East Units Scale Converg. DX4890;SPC CA 6 - 634,826.587 2,016,075.037 MT 0.99995450 +0 05 41.8 DX4890;SPC CA 6 - 2,082,760.23 6,614,406.18 sFT 0.99995450 +0 05 41.8 DX4890;UTM 11 - 3,694,046.630 585,829.011 MT 0.99969082 +0 30 27.9 DX4890 DX4890: Primary Azimuth Mark Grid Az DX4890:SPC CA 6 - B 577 117 51 04.1 DX4890:UTM 11 - B 577 117 26 18.0 DX4890 DX4890|---------------------------------------------------------------------| DX4890| PID Reference Object Distance Geod. Az | DX4890| dddmmss.s | DX4890| DW1487 MECCA HILLS AIRWAY BEACON APPROX.31.8 KM 0152421.2 | DX4890| CE9175 COOLIDGE RM 1 4.953 METERS 08452 | DX4890| CE9174 COOLIDGE AZ MK 0894533.4 | DX4890| DX0454 B 577 1175645.9 | DX4890| CE9176 COOLIDGE RM 2 4.252 METERS 17410 | DX4890| DX4877 LOS ANGELES PHOENIX AWY BCN 12 APPROX.44.5 KM 3384335.5 | DX4890|---------------------------------------------------------------------| DX4890 DX4890 SUPERSEDED SURVEY CONTROL DX4890 DX4890 NAD 83(1986)- 33 22 56.16464(N) 116 04 38.03429(W) AD(1984.00) 1 DX4890 NAD 27 - 33 22 56.05500(N) 116 04 35.02600(W) AD( ) 1 DX4890 NGVD 29 - 683.5 (m) 2242. (f) VERT ANG DX4890 DX4890.Superseded values are not recommended for survey control. DX4890.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums. DX4890.See file dsdata.txt to determine how the superseded data were derived. DX4890 DX4890_U.S. NATIONAL GRID SPATIAL ADDRESS: 11SNS8582994047(NAD 83) DX4890_MARKER: DO = NOT SPECIFIED OR SEE DESCRIPTION DX4890_SETTING: 80 = SET IN A BOULDER DX4890 DX4890 HISTORY - Date Condition Report By DX4890 HISTORY - 1939 MONUMENTED CGS DX4890 HISTORY - 1954 SEE DESCRIPTION USGS DX4890 HISTORY - 1955 SEE DESCRIPTION CGS DX4890 HISTORY - 1972 SEE DESCRIPTION NGS DX4890 DX4890 STATION DESCRIPTION DX4890 DX4890'DESCRIBED BY COAST AND GEODETIC SURVEY 1939 (FGJ) DX4890'ABOUT 12 MILES SOUTH OF MECCA AND ABOUT 3-1/2 MILES WEST OF DX4890'U.S. HIGHWAY NO. 99, ABOUT 3.0 MILES NORTHWEST OF COOLIDGE DX4890'SPRINGS, ON THE HIGHEST POINT OF THE EAST END OF THE SANTA DX4890'ROSA MOUNTAINS. DX4890' DX4890'TO REACH FROM INDIO GO SOUTH ON U.S. HIGHWAY NO. 99 FOR DX4890'20.0 MILES TO THE OASIS SERVICE STATION. CONTINUE ON FOR DX4890'6.5 MILES TO AN OLD PAVED ROAD TURNING BACK SHARP RIGHT. DX4890'TURN RIGHT ON THIS ROAD 0.4 MILES TO A TRACK ROAD FORKING DX4890'LEFT. TAKE TRACK ROAD WEST UPGRADE 0.8 MILE. THERE ARE DX4890'SEVERAL TRACKS CRISS-CROSS IN HERE. KEEP ROAD WHICH GOES DX4890'TO MOUTH OF MAIN CANYON AND ENDS IN BOULDER PILE. END OF DX4890'TRUCK TRAVEL. PACK WEST UP WASH TO TOP OF RIDGE AND THEN DX4890'NORTHWEST AND WEST TO HIGHEST POINT AND STATION. (VERY DX4890'ROUGH AND STEEP, ABOUT 2-1/2 HOUR PACK WITH LOAD). DX4890' DX4890'SURFACE, REFERENCE AND AZIMUTH MARKS ARE STANDARD BRONZE DX4890'DISKS IN A BOULDER AND IN CONCRETE, NOTES 4, 12C AND 11A. DX4890' DX4890'STATION AND REFERENCE MARKS ARE IN BARE ROCK AND EASILY DX4890'LOCATED. DX4890' DX4890'AZIMUTH MARK IS AT CROSSROADS OF U.S. HIGHWAY NO. 99 AND DX4890'A DIRT ROAD LEADING EAST TO SALTON SEA, 40-1/2 FEET SOUTHWEST DX4890'OF CENTER OF U.S. HIGHWAY 99, 18 FEET SOUTHWEST OF ENAMELED DX4890'SIGN (SALTON SEA 1-1/2). REACHED FROM THE DESCRIPTION BEFORE DX4890'TURNING OFF OF U.S. HIGHWAY 99 ON OLD PAVED ROAD LEADING DX4890'BACK SHARP RIGHT, CONTINUE ON HIGHWAY 99 FOR 0.6 MILE TO DX4890'CROSS ROAD AND MARK. STAMPED COOLIDGE 1939. DX4890 DX4890 STATION RECOVERY (1954) DX4890 DX4890'RECOVERY NOTE BY US GEOLOGICAL SURVEY 1954 DX4890'THE REINFORCED CONCRETE POST (BUT NOT THE TABLET) WAS FOUND DX4890'WHERE IT HAD BEEN DUG OUT WHEN THE SHOULDER OF THE HIGHWAY DX4890'AND A BORROW PIT HAD BEEN BULLDOZED OVER. DX4890 DX4890 STATION RECOVERY (1955) DX4890 DX4890'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955 (LSB) DX4890'THE STATION MARK AND REFERENCE MARKS 1 AND 2 WERE RECOVERED DX4890'AS DESCRIBED AND IN GOOD CONDITION. A SEARCH WAS MADE FOR DX4890'THE AZIMUTH MARK, BUT IT WAS NOT RECOVERED. INDICATIONS DX4890'ARE THAT IT HAS BEEN DESTROYED BY HEAVY EQUIPMENT. THE DX4890'ORIGINAL DESCRIPTION OF THE ROUTE TO THE STATION IS ADEQUATE DX4890'FOR RECOVERY, BUT ADDITIONS AND CORRECTIONS ARE ADDED. BENCH DX4890'MARK B 577 WAS USED FOR THE AZIMUTH MARK. DX4890' DX4890'REACHED FROM THE JUNCTION OF U.S. HIGHWAY 99 AND STATE HIGHWAY DX4890'78 (16 MI. NW OF WESTMORLAND), DRIVE NW ON U.S. HIGHWAY 99 DX4890'FOR 17.2 MI. TO A RICHFIELD SERVICE STATION ON THE LEFT DX4890'(W) SIDE OF U.S. HIGHWAY 99. CONTINUE NW FOR 1.35 MI. TO DX4890'BENCH MARK B 577 1939 ON THE LEFT (W) SIDE OF U.S. HIGHWAY DX4890'99, 37.07 FT. W OF THE CENTERLINE OF U.S. HIGHWAY 99, AND DX4890'1 FT. NW OF A WHITE WITNESS POST. FROM BENCH MARK B 577, DX4890'THE STATION BEARS ABOUT 290 DEG MAGNETIC. CONTINUE NW ON DX4890'U.S. HIGHWAY 99 FOR 2.2 MI. TO A SIDE ROAD E (LEADING TO DX4890'BEACH) AND A SUN DIAL INC SIGN. CONTINUE NW ON U.S. HIGHWAY DX4890'99 FOR 0.55 MI. TO HIGHWAY BRIDGE 58-72 AND AN OLD PAVEMENT DX4890'(CONCRETE) BEARING LEFT (NW). TURN LEFT AND FOLLOW THE DX4890'OLD PAVEMENT FOR 0.4 MI. TO A TRACK ROAD LEFT (W). TURN DX4890'LEFT ON THE TRACK ROAD AND GO 0.3 MI. TO A POWERLINE AND A DX4890'POWERLINE ROAD. CROSS THE POWERLINE ROAD AND CONTINUE W ON DX4890'THE TRACK ROAD FOR 0.1 MI. TO SEVERAL TRACK ROADS. TAKE DX4890'THE LEFT ONE AND DRIVE FOR 0.6 MI. TO THE END OF TRUCK DX4890'TRAVEL IN A BOULDER FIELD WHICH IS ABOUT 200 YD. FROM THE DX4890'BASE OF THE MOUNTAIN. PACK W UP THE WASH FOR ABOUT 200 YD. DX4890'TO A FORK IN THE WASH. TAKE THE LEFT FORK OF THE WASH AND DX4890'CONTINUE FOR A FEW HUNDRED YD. TO A LIKELY SPOT TO LEAVE THE DX4890'WASH ON THE LEFT. LEAVE THE WASH AND PACK TO THE TOP OF DX4890'THE RIDGE ON THE S, THENCE FOLLOW THE RIDGE W AND SW TO DX4890'THE HIGHEST POINT IN THE VICINITY AND THE STATION. A 2-HOUR DX4890'AND 45-MINUTE PACK. A FOUR-WHEEL DRIVE VEHICLE IS NEEDED DX4890'FOR THE LAST 1 MI. DX4890 DX4890 STATION RECOVERY (1972) DX4890 DX4890'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1972 (ATD) DX4890'THE STATION WAS RECOVERED EXACTLY AS PREVIOUSLY DESCRIBED DX4890'AND ALL MARKS ARE IN GOOD CONDITION. DISTANCES AND DIRECTIONS DX4890'CHECK 1939 DATA. THE PREVIOUS DESCRIPTION OF THE ROUTE TO DX4890'THE STATION IS ADEQUATE. DX4890' DX4890'A HELICOPTER LANDING AREA HAS BEEN CLEARED 300 FEET N.E. OF DX4890'THE STATION. DX4890' DX4890'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--ABOUT DX4890'13 MILES SOUTH OF MECCA