National Geodetic Survey, Retrieval Date = OCTOBER 26, 2004 JS3948 *********************************************************************** JS3948 DESIGNATION - BIG HILL JS3948 PID - JS3948 JS3948 STATE/COUNTY- CA/EL DORADO JS3948 USGS QUAD - RIVERTON (1973) JS3948 JS3948 *CURRENT SURVEY CONTROL JS3948 ___________________________________________________________________ JS3948* NAD 83(1992)- 38 50 32.60540(N) 120 24 27.16178(W) ADJUSTED JS3948* NAVD 88 - 1876.97 (+/-2cm) 6158.0 (feet) VERTCON JS3948 ___________________________________________________________________ JS3948 EPOCH DATE - 1991.35 JS3948 LAPLACE CORR- 10.18 (seconds) DEFLEC99 JS3948 GEOID HEIGHT- -24.73 (meters) GEOID03 JS3948 JS3948 HORZ ORDER - FIRST JS3948 VERT ORDER - THIRD ? (See Below) JS3948 JS3948.The horizontal coordinates were established by classical geodetic methods JS3948.and adjusted by the National Geodetic Survey in March 1994. JS3948.The horizontal coordinates are valid at the epoch date displayed above. JS3948.The epoch date for horizontal control is a decimal equivalence JS3948.of Year/Month/Day. JS3948 JS3948.The NAVD 88 height was computed by applying the VERTCON shift value to JS3948.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) JS3948.The vertical order pertains to the NGVD 29 superseded value. JS3948 JS3948.The Laplace correction was computed from DEFLEC99 derived deflections. JS3948 JS3948.The geoid height was determined by GEOID03. JS3948 JS3948; North East Units Scale Factor Converg. JS3948;SPC CA 2 - 631,722.767 2,138,236.532 MT 0.99992357 +1 00 14.4 JS3948;SPC CA 2 - 2,072,577.11 7,015,197.69 sFT 0.99992357 +1 00 14.4 JS3948;UTM 10 - 4,302,480.432 724,998.949 MT 1.00022343 +1 37 35.8 JS3948 JS3948! - Elev Factor x Scale Factor = Combined Factor JS3948!SPC CA 2 - 0.99970947 x 0.99992357 = 0.99963306 JS3948!UTM 10 - 0.99970947 x 1.00022343 = 0.99993284 JS3948 JS3948: Primary Azimuth Mark Grid Az JS3948:SPC CA 2 - ROBBS PEAK LOOKOUT 1940 001 10 18.2 JS3948:UTM 10 - ROBBS PEAK LOOKOUT 1940 000 32 56.8 JS3948 JS3948|---------------------------------------------------------------------| JS3948| PID Reference Object Distance Geod. Az | JS3948| dddmmss.s | JS3948| JS3956 ROBBS PEAK LOOKOUT 1940 APPROX. 9.2 KM 0021032.6 | JS3948| DA8748 BIG HILL RM 1 9.715 METERS 24753 | JS3948| JS3951 BIG HILL ECC RM 3 20.215 METERS 30700 | JS3948| JS3949 BIG HILL LOOKOUT TOWER 1949 23.740 METERS 30859 | JS3948| DA8749 BIG HILL RM 2 8.966 METERS 31925 | JS3948|---------------------------------------------------------------------| JS3948 JS3948 SUPERSEDED SURVEY CONTROL JS3948 JS3948 NAD 83(1986)- 38 50 32.58232(N) 120 24 27.14012(W) AD(1984.00) 1 JS3948 NAD 27 - 38 50 32.92300(N) 120 24 23.43000(W) AD( ) 1 JS3948 NGVD 29 (07/19/86) 1875.96 (m) 6154.7 (f) LEVELING 3 JS3948 JS3948.Superseded values are not recommended for survey control. JS3948.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums. JS3948.See file dsdata.txt to determine how the superseded data were derived. JS3948 JS3948_U.S. NATIONAL GRID SPATIAL ADDRESS: 10SGJ2499902480(NAD 83) JS3948_MARKER: DS = TRIANGULATION STATION DISK JS3948_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT JS3948_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO JS3948+STABILITY: SURFACE MOTION JS3948 JS3948 HISTORY - Date Condition Report By JS3948 HISTORY - 1940 MONUMENTED CGS JS3948 HISTORY - 1949 SEE DESCRIPTION CGS JS3948 HISTORY - 1949 GOOD USGS JS3948 HISTORY - 1960 SEE DESCRIPTION CGS JS3948 HISTORY - 1973 SEE DESCRIPTION NGS JS3948 JS3948 STATION DESCRIPTION JS3948 JS3948'DESCRIBED BY COAST AND GEODETIC SURVEY 1940 (JCS) JS3948'STATION IS LOCATED IN THE ELDORADO NATIONAL FOREST ON THE SAME JS3948'PEAK AS THE BIG HILL LOOKOUT TOWER OF THE U.S. FOREST SERVICE, JS3948'ABOUT 5-1/2 MILES NORTH-NORTHEAST OF RIVERTON, 7-1/2 MILES JS3948'NORTHWEST OF KYBURZ. JS3948' JS3948'REACHED FROM RIVERTON, A SMALL SETTLEMENT ON U.S. HIGHWAY 50, BY JS3948'TAKING THE ICE HOUSE ROAD (ABOUT 50 YARDS EAST OF THE AMERICAN JS3948'RIVER BRIDGE) NORTHWARD 1.7 MILES TO FORKS. KEEP TO THE RIGHT JS3948'FORK (MAIN TRAVELED ROAD) FOR 0.8 MILE TO FORKS. TAKE LEFT FORK JS3948'AT SIGN, ICE HOUSE ROAD, ICE HOUSE RANGER STATION, GO 2.1 JS3948'MILES. KEEP STRAIGHT AHEAD FROM SIGN, ICE HOUSE 2-1/2 BIG HILL JS3948'L.O. 6 FOR 2.3 MILES (ICE HOUSE RANGER STATION TO RIGHT OF JS3948'ROAD). SIGN, SOUTH SILVER CREEK 1/2 MILE, MIDDLE SILVER CREEK 3. JS3948'CONTINUE STRAIGHT AHEAD ON MAIN TRAVELED ROAD FOR 0.4 JS3948'MILE. CROSS SOUTH SILVER CREEK AND CONTINUE 1.1 MILES TO JS3948'FORKS. TAKE LEFT FORK AT SIGN, BIG HILL L.O. 2-1/2 AND JS3948'FOLLOW BIG HILL ROAD 2.6 MILES TO LOOKOUT TOWER AND STATION. JS3948' JS3948'STATION IS MARKED BY A STANDARD DISK SET IN A SQUARE BLOCK OF JS3948'CONCRETE PROJECTING ABOUT 6 INCHES ABOVE THE GROUND, ABOUT 24 JS3948'METERS SOUTHEAST OF THE CENTER OF THE FOREST SERVICE LOOKOUT JS3948'TOWER. MARK STAMPED BIG HILL 1940. JS3948' JS3948'REFERENCE MARK NO. 1 IS A STANDARD DISK SET IN OUTCROPPING JS3948'BEDROCK ABOUT 10 METERS WEST-SOUTHWEST OF STATION, SET FLUSH JS3948'WITH THE GROUND. STAMPED BIG HILL NO. 1 1940. JS3948' JS3948'REFERENCE MARK NO. 2 IS A STANDARD DISK SET IN THE CONCRETE JS3948'RAMP OF GARAGE ENTRANCE, ABOUT 9 METERS NORTHWEST OF STATION. JS3948'STAMPED BIG HILL NO. 2, 1940. JS3948' JS3948'U.S. FOREST SERVICE LOOKOUT TOWER ON ROBBS HILL, ABOUT 6 MILES JS3948'NORTH OF STATION, WAS USED AS AN AZIMUTH MARK. JS3948' JS3948'SURFACE MARK, UNDERGROUND MARK AND REFERENCE MARK NO. 1 ARE JS3948'SET AS DESCRIBED IN NOTES 1A, 7A AND 12A RESPECTIVELY. JS3948 JS3948 STATION RECOVERY (1949) JS3948 JS3948'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1949 (WRH) JS3948'THE STATION WAS RECOVERED AS DESCRIBED. ALL THE MARKS WERE IN JS3948'GOOD CONDITION. A COMPLETE DESCRIPTION FOLLOWS. JS3948' JS3948'THE STATION IS LOCATED IN THE ELDORADO NATIONAL FOREST AND ON JS3948'THE SAME HILL THAT THE BIG HILL LOOKOUT TOWER IS ON. IT IS JS3948'ABOUT 23 MILES AIRLINE EAST-NORTHEAST OF PLACERVILLE, ABOUT JS3948'5-1/2 MILES AIRLINE NORTH-NORTHEAST OF RIVERTON, AND ABOUT 7-1/2 JS3948'MILES AIRLINE NORTHWEST OF KYBURZ. JS3948' JS3948'THE STATION IS 77 FEET SOUTHEAST OF THE BIG HILL LOOKOUT TOWER, JS3948'AND 35 FEET SOUTHEAST OF THE SOUTHEAST CORNER OF THE GARAGE. JS3948'IT IS A STANDARD DISK SET IN THE TOP OF A CONCRETE POST THAT JS3948'PROJECTS 6 INCHES ABOVE THE GROUND. THE DISK IS STAMPED--BIG JS3948'HILL 1940. JS3948' JS3948'REFERENCE MARK NUMBER ONE IS 41 FEET SOUTH OF THE SOUTH SIDE JS3948'OF THE GARAGE, AND 2 FEET WEST OF A TRAIL THAT GOES TO THE JS3948'GARBAGE PIT. IT IS A STANDARD DISK SET IN A DRILL HOLE IN JS3948'BEDROCK THAT PROJECTS 6 INCHES ABOVE THE GROUND. THE DISK JS3948'IS STAMPED--BIG HILL NO 1 1940. JS3948' JS3948'REFERENCE MARK NUMBER TWO IS 6 FEET SOUTH OF THE SOUTH SIDE JS3948'OF THE GARAGE. IT IS A STANDARD DISK SET IN A DRILL HOLE IN JS3948'THE CONCRETE RAMP OF THE GARAGE ENTRANCE. IT IS ABOUT 6 JS3948'INCHES ABOVE THE GROUND. THE DISK IS STAMPED--BIG HILL NO 2 1940. JS3948' JS3948'THE CENTER OF THE ROOF OF THE ROBBS HILL LOOKOUT TOWER WILL BE JS3948'USED AS THE AZIMUTH MARK. IT IS ABOUT 6 MILES AIRLINE NORTH JS3948'OF THE STATION, AND ON THE SUMMIT OF A BARE AND ROUND TOPPED JS3948'HILL. JS3948' JS3948'THE BIG HILL LOOKOUT TOWER IS A 14 FOOT SQUARE BUILDING THAT JS3948'IS ON THE TOP OF A 30 FOOT STEEL TOWER. THE BASE OF THE TOWER JS3948'IS 18 FEET SQUARE AND ABOUT 4 FEET HIGHER THAN THE STATION. JS3948'THE OUTSIDE OF THE BUILDING IS PAINTED BROWN COLOR AND THE JS3948'STEEL TOWER IS PAINTED SILVER COLOR. THE CENTER OF THE BASE JS3948'OF THE TOWER WILL SERVE AS THE SUBSTITUTE STATION. JS3948' JS3948'TO REACH THE STATION FROM RIVERTON, A SMALL SETTLEMENT ON JS3948'U.S. HIGHWAY 50 THAT IS 16 MILES EAST OF PLACERVILLE, GO EAST JS3948'AND CROSS THE BRIDGE OVER THE AMERICAN RIVER AND GO TO A SIDE ROAD JS3948'TO THE LEFT. TURN LEFT AS PER SIGN ICE HOUSE RD. AND GO 6.7 JS3948'MILES TO A FORK THAT IS JUST AFTER PASSING THROUGH A POLE JS3948'GATE. TAKE THE LEFT FORK AS PER SIGN SOUTH SILVER CREEK 1/2 JS3948'MILE AND GO 1.6 MILES TO A FORK. TAKE THE LEFT FORK AS PER JS3948'SIGN BIG HILL LOOKOUT 2-1/2 AND GO 2.6 MILES TO THE BIG HILL JS3948'LOOKOUT TOWER AND THE STATION AS DESCRIBED. JS3948 JS3948 STATION RECOVERY (1949) JS3948 JS3948'RECOVERY NOTE BY US GEOLOGICAL SURVEY 1949 JS3948'RECOVERED AS DESCRIBED. ALL MARKS IN GOOD CONDITION. JS3948' JS3948'BIG HILL LOT--37-FT STEEL USFS LOT. JS3948 JS3948 STATION RECOVERY (1960) JS3948 JS3948'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960 (IRR) JS3948'THE UNDERGROUND-STATION MARK, REFERENCE MARKS, AND BIG HILL JS3948'LOOKOUT TOWER WERE RECOVERED IN GOOD CONDITION BUT THE JS3948'SURFACE-STATION MARK HAD BEEN ACCIDENTALLY DESTROYED BY A JS3948'MOTOR PATROL TRUCK WHILE GRADING THE ACCESS ROAD TO THE JS3948'BIG HILL LOOKOUT IN THE SPRING OF 1960 SO A NEW SURFACE-STATION JS3948'MARK WAS SET ON THIS DATE. THE 1949 DESCRIPTION WAS FOUND JS3948'TO BE ADEQUATE WITH THE FOLLOWING ADDITIONS-- JS3948' JS3948'THE NEW SURFACE STATION MARK IS A STANDARD DISK STAMPED BIG JS3948'HILL 1940 1960 SET IN THE TOP OF A 12-INCH CONCRETE CYLINDER JS3948'THAT PROJECTS 3 INCHES ABOVE THE GROUND. IT IS 77.8 FEET JS3948'SOUTHEAST OF THE CENTER OF THE BIG HILL LOOKOUT TOWER, 40.2 JS3948'FEET NORTHWEST OF THE NORTHWEST CORNER OF A CONCRETE-BLOCK JS3948'POWER SUPPLY BUILDING, AND 33.4 FEET SOUTHEAST OF THE SOUTHEAST JS3948'CORNER OF A GARAGE. JS3948' JS3948'HEIGHT OF TRIPOD--1 METER JS3948 JS3948 STATION RECOVERY (1973) JS3948 JS3948'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1973 (GAW) JS3948'THE STATION MARK AND REFERENCE MARK 2 WERE RECOVERED IN GOOD JS3948'CONDITION AS DESCRIBED BY I.R. RUBOTTOM IN 1960. REFERENCE MARK JS3948'1 WAS SEARCHED FOR AND WAS NOT FOUND, REFERENCE MARK 3 WAS JS3948'SET AT THIS TIME (USED AS AN ECCENTRIC). JS3948' JS3948'A COMPLETE NEW DESCRIPTION FOLLOWS-- JS3948' JS3948'THE STATION IS LOCATED ABOUT 4.7 MILES NORTH OF WHITE HALL JS3948'AND ABOUT 7.7 MILES NORTHWEST OF KYBURZ ON THE NORTH END OF BIG JS3948'HILL RIDGE NEAR THE BIG HILL LOOKOUT TOWER. JS3948' JS3948'TO REACH THE STATION FROM RIVERTON (INTERSECTION OF STATE HIGHWAY JS3948'50 AND ICE HOUSE ROAD), GO NORTHERLY ON ICE HOUSE ROAD 10.2 JS3948'MILES TO ROAD ON LEFT AND BIG HILL LOOKOUT SIGN, TURN LEFT AND GO JS3948'1.25 MILES TO A ROAD ON RIGHT AND BIG HILL LOOKOUT SIGN ON JS3948'RIGHT, TURN RIGHT AND GO 1.3 MILES TO LOOKOUT AND STATION. JS3948' JS3948'STATION MARK IS A STANDARD USC AND GS DISK STAMPED BIG HILL JS3948'1940 1960 SET IN A 12-INCH CONCRETE CYLINDER 0.5 FOOT BELOW JS3948'GROUND, 77.8 FEET SOUTHEAST OF THE CENTER OF THE LOOKOUT TOWER, JS3948'40.2 FEET NORTHWEST OF THE SOUTHWEST CORNER OF CONCRETE BLOCK JS3948'POWER SUPPLY BUILDING, 33.4 FEET SOUTHEAST OF CORNER OF GARAGE. JS3948' JS3948'REFERENCE MARK 2 IS A STANDARD USC AND GS DISK STAMPED BIG HILL JS3948'NO 2 1940 SET IN GARAGE DRIVEWAY 6.0 FEET SOUTH OF SOUTHEAST JS3948'CORNER OF GARAGE AND 3.0 FEET HIGHER THAN STATION. JS3948' JS3948'REFERENCE MARK 3 IS A DIVISION OF HIGHWAYS BRASS DISK STAMPED JS3948'BIG HILL 1940 1960 R.M. NO 3 1973 SET IN DRILL HOLE IN SIDEWALK JS3948'0.5 FOOT SOUTH OF JOINT IN SIDEWALK, 1.0 FOOT SOUTHEAST OF JS3948'SOUTHEAST LEG OF LOOKOUT TOWER AND 4.4 FEET HIGHER THAN STATION. JS3948' JS3948'HEIGHT OF LIGHT ABOVE STATION MARK 26.01 FEET. JS3948' JS3948'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--7.7 MILES JS3948'NORTHWEST OF KYBURZ