National Geodetic Survey, Retrieval Date = OCTOBER 26, 2004 JS3952 *********************************************************************** JS3952 DESIGNATION - ROBBS JS3952 PID - JS3952 JS3952 STATE/COUNTY- CA/EL DORADO JS3952 USGS QUAD - ROBBS PEAK (1973) JS3952 JS3952 *CURRENT SURVEY CONTROL JS3952 ___________________________________________________________________ JS3952* NAD 83(1992)- 38 55 29.20872(N) 120 24 13.24810(W) ADJUSTED JS3952* NAVD 88 - 2037.8 (meters) 6686. (feet) VERTCON JS3952 ___________________________________________________________________ JS3952 EPOCH DATE - 1991.35 JS3952 LAPLACE CORR- 9.52 (seconds) DEFLEC99 JS3952 GEOID HEIGHT- -24.48 (meters) GEOID03 JS3952 JS3952 HORZ ORDER - SECOND JS3952 JS3952.The horizontal coordinates were established by classical geodetic methods JS3952.and adjusted by the National Geodetic Survey in March 1994. JS3952.The horizontal coordinates are valid at the epoch date displayed above. JS3952.The epoch date for horizontal control is a decimal equivalence JS3952.of Year/Month/Day. JS3952 JS3952.The NAVD 88 height was computed by applying the VERTCON shift value to JS3952.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) JS3952 JS3952.The Laplace correction was computed from DEFLEC99 derived deflections. JS3952 JS3952.The geoid height was determined by GEOID03. JS3952 JS3952; North East Units Scale Factor Converg. JS3952;SPC CA 2 - 640,872.881 2,138,411.360 MT 0.99991855 +1 00 23.1 JS3952;SPC CA 2 - 2,102,597.11 7,015,771.27 sFT 0.99991855 +1 00 23.1 JS3952;UTM 10 - 4,311,634.677 725,074.127 MT 1.00022383 +1 37 55.0 JS3952 JS3952! - Elev Factor x Scale Factor = Combined Factor JS3952!SPC CA 2 - 0.99968421 x 0.99991855 = 0.99960278 JS3952!UTM 10 - 0.99968421 x 1.00022383 = 0.99990797 JS3952 JS3952: Primary Azimuth Mark Grid Az JS3952:SPC CA 2 - ROBBS AZ MK 324 54 03.7 JS3952:UTM 10 - ROBBS AZ MK 324 16 31.8 JS3952 JS3952|---------------------------------------------------------------------| JS3952| PID Reference Object Distance Geod. Az | JS3952| dddmmss.s | JS3952| DA9646 ROBBS RM 2 21.089 METERS 00018 | JS3952| JS3955 ROBBS PEAK LOOKOUT USFS 1940 16.571 METERS 03950 | JS3952| JS3956 ROBBS PEAK LOOKOUT 1940 16.626 METERS 05000 | JS3952| JS3954 BM NR ROBBS 21.543 METERS 06047 | JS3952| DA9645 ROBBS RM 1 3.515 METERS 14022 | JS3952| DA9644 ROBBS AZ MK 3255426.8 | JS3952|---------------------------------------------------------------------| JS3952 JS3952 SUPERSEDED SURVEY CONTROL JS3952 JS3952 NAD 83(1986)- 38 55 29.19041(N) 120 24 13.22249(W) AD(1984.00) 2 JS3952 NAD 27 - 38 55 29.52700(N) 120 24 09.51100(W) AD( ) 2 JS3952 NGVD 29 (07/19/86) 2036.8 (m) 6682. (f) VERT ANG JS3952 JS3952.Superseded values are not recommended for survey control. JS3952.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums. JS3952.See file dsdata.txt to determine how the superseded data were derived. JS3952 JS3952_U.S. NATIONAL GRID SPATIAL ADDRESS: 10SGJ2507411635(NAD 83) JS3952_MARKER: DS = TRIANGULATION STATION DISK JS3952_SETTING: 80 = SET IN A BOULDER JS3952_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO JS3952+STABILITY: SURFACE MOTION JS3952 JS3952 HISTORY - Date Condition Report By JS3952 HISTORY - 1940 MONUMENTED CGS JS3952 HISTORY - 1946 SEE DESCRIPTION CGS JS3952 HISTORY - 1949 SEE DESCRIPTION CGS JS3952 HISTORY - 1949 GOOD USGS JS3952 HISTORY - 1960 SEE DESCRIPTION CGS JS3952 JS3952 STATION DESCRIPTION JS3952 JS3952'DESCRIBED BY COAST AND GEODETIC SURVEY 1940 (JCS) JS3952'STATION IS LOCATED ABOUT 11 MILES NORTH-NORTHEAST OF RIVERTON, JS3952'1-1/2 MILES SOUTH OF THE SOUTH FORK PUBLIC CAMP, ON THE SOUTH JS3952'FORK OF THE RUBICON RIVER, 1-1/4 MILES WEST OF ROBBS VALLEY, ON JS3952'THE LAND OF THE ELDORADO NATIONAL FOREST, AND ON THE SAME JS3952'MOUNTAIN AS THE ROBBS PEAK FOREST SERVICE LOOKOUT TOWER. JS3952' JS3952'REACHED FROM RIVERTON, ON U.S. HIGHWAY 50, BY TAKING THE ICE JS3952'HOUSE ROAD LEADING LEFT OFF THE HIGHWAY, JUST EAST OF THE JS3952'AMERICAN RIVER BRIDGE EAST OF RIVERTON. GO UP HILL ON ICE JS3952'HOUSE ROAD 4.6 MILES. KEEP STRAIGHT AHEAD ON ICE HOUSE ROAD JS3952'2.4 MILES, PASS THROUGH GATE, TAKE LEFT FORK AND GO 0.4 MILE. JS3952'CROSS SOUTH FORK OF SILVER CREEK AND FOLLOW MAIN TRAVELED JS3952'ROAD 2.0 MILES, PASS THROUGH GATE AND GO 1.05 MILES. CROSS JS3952'MIDDLE FORK OF SILVER CREEK AND CONTINUE ON MAIN TRAVELED JS3952'ROAD 0.45 MILE. TAKE LEFT FORK AT SIGN, UNION VALLEY, ROBBS JS3952'VALLEY, GO 1.1 MILES. TAKE RIGHT FORK AT SIGN, ROBBS VALLEY JS3952'GO 0.6 MILE. TAKE LEFT FORK, GO 0.7 MILE AND TAKE LEFT FORK, JS3952'GO 0.1 MILE, CROSS SILVER CREEK AT THE PUBLIC CAMP GROUNDS. JS3952'TAKE THE RIGHT FORK LEADING AWAY FROM THE CREEK AND FOLLOW JS3952'THE MAIN TRAVELED ROAD 0.6 MILE TO SIGN, BASSIS, SLICK ROCK JS3952'TRAIL, TAKE LEFT FORK, GO 3.05 MILES TO ROBBS VALLEY, TAKE JS3952'LEFT FORK, GO 1.5 MILES. TAKE LEFT FORK AT SIGN, SOUTH JS3952'FORK, GO 0.6 MILE. TURN LEFT ON THE PLACERVILLE-WENTWORTH JS3952'SPRINGS ROAD, GO 1.9 MILES. TURN LEFT AT SIGN ROBBS PEAK, JS3952'GO 1.3 MILES TO AZIMUTH MARK, 20 FEET SOUTH OF THE ROAD IN A JS3952'BOULDER 6 FEET HIGH AND 40 FEET EAST OF ONE ABOUT 10 FEET JS3952'HIGH. CONTINUE EAST 1.1 MILES TO THE TOP OF THE MOUNTAIN AND JS3952'THE STATION. JS3952' JS3952'SURFACE, REFERENCE AND AZIMUTH MARKS ARE SET AS DESCRIBED IN JS3952'NOTES 4, AND 12C RESPECTIVELY. JS3952 JS3952 STATION RECOVERY (1946) JS3952 JS3952'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1946 (JAM) JS3952'RECOVERED AS DESCRIBED. AZIMUTH MARK IS PROBABLY 3/4 MILE JS3952'AIRLINE AND NOT 3.4 MILE. JS3952' JS3952'THE STONE ON WHICH STATION MARK IS SET IS LOOSE AND APPEARS TO JS3952'BE VERY SHALLOW. JS3952 JS3952 STATION RECOVERY (1949) JS3952 JS3952'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1949 (WRH) JS3952'THE STATION MARK, REFERENCE MARKS, AZIMUTH MARK AND OTHER MARKS JS3952'WERE ALL RECOVERED AND FOUND TO BE IN GOOD CONDITION. A COMPLETE JS3952'DESCRIPTION FOLLOWS-- JS3952' JS3952'THE STATION IS LOCATED ON THE SAME MOUNTAIN AS THE ROBBS PEAK JS3952'LOOKOUT, ABOUT 11 MILES AIRLINE NORTH-NORTHEAST OF RIVERTON, JS3952'ABOUT 23 MILES AIRLINE EAST OF GEORGETOWN AND ABOUT 25 MILES JS3952'AIRLINE NORTHEAST OF PLACERVILLE. JS3952' JS3952'TO REACH THE STATION FROM RIVERTON, GO EAST ON U.S. HIGHWAY 50 FOR JS3952'0.1 MILE TO A SIDE ROAD ON THE LEFT. TURN LEFT AS PER SIGN JS3952'ICE HOUSE ROAD AND GO 2.0 MILES TO A FORK. TAKE THE LEFT FORK JS3952'AS PER SIGN ICE HOUSE AND GO 2.3 MILES TO A FORK. TAKE THE JS3952'LEFT FORK AS PER SIGN BIG SILVER CREEK 7 AND GO 1.5 MILES JS3952'TO A FORK. TAKE THE RIGHT FORK AS PER SIGN BIG SILVER CREEK 5 JS3952'AND GO 5.4 MILES TO A FORK. TAKE THE RIGHT FORK AND GO 3.4 MILES JS3952'TO A FORK. TAKE THE LEFT FORK AS PER SIGN 12 WENTWORTH JS3952'SPRINGS AND GO 1.5 MILES TO A FORK. TAKE THE LEFT FORK AS PER JS3952'SIGN GEORGETOWN AND GO 2.4 MILES TO A FORK. TURN SHARP JS3952'LEFT AS PER SIGN ROBBS L.O. AND GO 1.3 MILES TO THE CREST OF JS3952'A LOW RIDGE AND THE AZIMUTH MARK ON THE RIGHT. KEEP STRAIGHT JS3952'AHEAD AND GO 1.1 MILES TO THE TOP OF THE MOUNTAIN, THE JS3952'LOOKOUT AND THE STATION. JS3952' JS3952'THE STATION MARK IS A STANDARD DISK STAMPED ROBBS 1940 SET JS3952'IN A DRILL HOLE IN A BOULDER THAT PROJECTS ABOUT 3 INCHES ABOVE JS3952'THE GROUND. IT IS 45.4 FEET SOUTHWEST OF THE SOUTHWEST CORNER JS3952'OF THE LOOKOUT. JS3952' JS3952'REFERENCE MARK NUMBER 1 IS A STANDARD DISK STAMPED ROBBS NO JS3952'1 1940 SET IN A DRILL HOLE IN A BOULDER THAT PROJECTS ABOUT JS3952'2 INCHES ABOVE THE GROUND. IT IS ABOUT 24 INCHES LOWER THAN JS3952'THE STATION. JS3952' JS3952'REFERENCE MARK NUMBER 2 IS A STANDARD DISK STAMPED ROBBS JS3952'NO 2 1940 SET IN A DRILL HOLE IN A BOULDER THAT PROJECTS ABOUT JS3952'3 INCHES ABOVE THE GROUND. IT IS ABOUT 24 INCHES LOWER THAN THE JS3952'STATION. JS3952' JS3952'THE AZIMUTH MARK IS A STANDARD DISK STAMPED ROBBS 1940 SET IN A JS3952'DRILL HOLE IN A LARGE BOULDER THAT PROJECTS ABOUT 6 FEET ABOVE JS3952'THE GROUND. IT IS ABOUT 20 FEET SOUTH OF THE CENTER OF THE ROAD JS3952'AND ABOUT 40 FEET EAST OF A PROMINENT BOULDER THAT IS ABOUT JS3952'10 FEET HIGH. JS3952' JS3952'THE U.S. DEPARTMENT OF AGRICULTURE FOREST SERVICE DISK IS JS3952'STAMPED F.S.M. ROBBS PK LOOKOUT ELEV. L.B.L. 1939 AND IS SET IN JS3952'A DRILL HOLE IN THE WEST SIDE OF THE CONCRETE FOUNDATION OF THE JS3952'LOOKOUT. IT IS 0.5 FOOT SOUTH OF THE NORTHWEST CORNER OF THE JS3952'LOOKOUT, ABOUT 10 INCHES ABOVE THE GROUND AND ABOUT 4 FEET HIGHER JS3952'THAN THE STATION. JS3952' JS3952'THE BUREAU OF RECLAMATION BENCH-MARK DISK IS NOT STAMPED AND IS JS3952'SET IN THE TOP OF A 9-INCH TILE PIPE THAT IS FILLED WITH JS3952'CONCRETE. IT PROJECTS ABOUT 5 INCHES ABOVE THE SURROUNDING JS3952'ROCKS AND IS ABOUT 3 FEET HIGHER THAN THE STATION. JS3952' JS3952'ROBBS PEAK LOOKOUT IS A WHITE, WOODEN BUILDING WITH A CONCRETE JS3952'FOUNDATION. A BOARD WALK SURROUNDS THE BUILDING ABOUT 7 FEET JS3952'ABOVE THE GROUND. JS3952 JS3952 STATION RECOVERY (1949) JS3952 JS3952'RECOVERY NOTE BY US GEOLOGICAL SURVEY 1949 JS3952'RECOVERED AS DESCRIBED. ALL MARKS IN GOOD CONDITION. JS3952' JS3952'ROBBS ECC--A FAIRCHILD STATION. JS3952' JS3952'ROBBS PEAK LO--NOT DESCRIBED. JS3952 JS3952 STATION RECOVERY (1960) JS3952 JS3952'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960 (IRR) JS3952'THE STATION MARK, REFERENCE MARKS, AND ROBBS PEAK LOOKOUT TOWER JS3952'WERE RECOVERED IN GOOD CONDITION AND THE 1949 DESCRIPTION IS JS3952'ADEQUATE. NO ATTEMPT WAS MADE TO RECOVER THE AZIMUTH MARK JS3952'ON THIS DATE.