National Geodetic Survey, Retrieval Date = DECEMBER 19, 2002 LT0520 *********************************************************************** LT0520 DESIGNATION - THOMPSON LT0520 PID - LT0520 LT0520 STATE/COUNTY- CA/PLUMAS LT0520 USGS QUAD - JANESVILLE (1994) LT0520 LT0520 *CURRENT SURVEY CONTROL LT0520 ___________________________________________________________________ LT0520* NAD 83(1992)- 40 15 40.97670(N) 120 33 28.98093(W) ADJUSTED LT0520* NAVD 88 - 2375.4 (meters) 7793. (feet) GPS OBS LT0520 ___________________________________________________________________ LT0520 EPOCH DATE - 1991.35 LT0520 X - -2,478,909.009 (meters) COMP LT0520 Y - -4,198,619.144 (meters) COMP LT0520 Z - 4,101,696.488 (meters) COMP LT0520 LAPLACE CORR- -6.18 (seconds) DEFLEC99 LT0520 ELLIP HEIGHT- 2352.74 (meters) GPS OBS LT0520 GEOID HEIGHT- -22.95 (meters) GEOID99 LT0520 LT0520 HORZ ORDER - B LT0520 ELLP ORDER - FOURTH CLASS II LT0520 LT0520.The horizontal coordinates were established by GPS observations LT0520.and adjusted by the National Geodetic Survey in May 1992. LT0520.The horizontal coordinates are valid at the epoch date displayed above. LT0520.The epoch date for horizontal control is a decimal equivalence LT0520.of Year/Month/Day. LT0520 LT0520.The orthometric height was determined by GPS observations and a LT0520.high-resolution geoid model. LT0520 LT0520.The X, Y, and Z were computed from the position and the ellipsoidal ht. LT0520 LT0520.The Laplace correction was computed from DEFLEC99 derived deflections. LT0520 LT0520.The ellipsoidal height was determined by GPS observations LT0520.and is referenced to NAD 83. LT0520 LT0520.The geoid height was determined by GEOID99. LT0520 LT0520; North East Units Scale Converg. LT0520;SPC CA 1 - 604,058.179 2,122,650.519 MT 0.99994443 +0 56 34.3 LT0520;SPC CA 1 - 1,981,814.21 6,964,062.58 sFT 0.99994443 +0 56 34.3 LT0520;UTM 10 - 4,459,629.604 707,657.628 MT 1.00013085 +1 34 43.4 LT0520 LT0520: Primary Azimuth Mark Grid Az LT0520:SPC CA 1 - THOMPSON RM 3 304 44 08.9 LT0520:UTM 10 - THOMPSON RM 3 304 05 59.8 LT0520 LT0520|---------------------------------------------------------------------| LT0520| PID Reference Object Distance Geod. Az | LT0520| dddmmss.s | LT0520| LT0510 SHAFFER PEAK HIGHEST POINT APPROX.26.7 KM 0393027.5 | LT0520| LT0031 V 843 0574422.6 | LT0520| DB8412 THOMPSON RM 2 40.437 METERS 14306 | LT0520| LT0523 THOMPSON PEAK LOOKOUT TOWER 58.160 METERS 14315 | LT0520| LT0522 THOMPSON PEAK FIRE LOT 57.890 METERS 14346 | LT0520| LT0524 RED ROCK LOOKOUT HOUSE APPROX.13.5 KM 2870500.9 | LT0520| DB8411 THOMPSON RM 1 13.922 METERS 30211 | LT0520| DB8413 THOMPSON RM 3 3054043.2 | LT0520| LT0619 HARVEY MOUNTAIN LOH 1948 APPROX.66.9 KM 3225449.0 | LT0520| LT0532 SUSANVILLE LASSEN CO W STACK APPROX.17.7 KM 3333802.8 | LT0520| LT0528 SUSANVILLE LASSEN CO E STACK APPROX.17.7 KM 3333917.6 | LT0520| LT0526 SUSANVILLE FRUIT GROWERS TANK APPROX.17.9 KM 3352915.8 | LT0520| LT0530 SUSANVILLE FRUIT GROWER NW STK APPROX.17.9 KM 3353205.9 | LT0520|---------------------------------------------------------------------| LT0520 LT0520 SUPERSEDED SURVEY CONTROL LT0520 LT0520 NAD 83(1986)- 40 15 40.97808(N) 120 33 28.97591(W) AD(1984.00) 1 LT0520 NAD 27 - 40 15 41.34600(N) 120 33 25.16900(W) AD( ) 1 LT0520 NGVD 29 - 2375.8 (m) 7795. (f) VERT ANG LT0520 LT0520.Superseded values are not recommended for survey control. LT0520.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums. LT0520.See file dsdata.txt to determine how the superseded data were derived. LT0520 LT0520_U.S. NATIONAL GRID SPATIAL ADDRESS: 10TGK0765859630(NAD 83) LT0520_MARKER: DD = SURVEY DISK LT0520_SETTING: 66 = SET IN ROCK OUTCROP LT0520_STAMPING: THOMPSON 1931 LT0520_MARK LOGO: CGS LT0520_MAGNETIC: O = OTHER; SEE DESCRIPTION LT0520_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD LT0520+STABILITY: POSITION/ELEVATION WELL LT0520_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR LT0520+SATELLITE: SATELLITE OBSERVATIONS - June 17, 1991 LT0520 LT0520 HISTORY - Date Condition Report By LT0520 HISTORY - 1931 MONUMENTED CGS LT0520 HISTORY - 1931 GOOD CGS LT0520 HISTORY - 1935 SEE DESCRIPTION USGS LT0520 HISTORY - 1948 SEE DESCRIPTION CGS LT0520 HISTORY - 1949 SEE DESCRIPTION CGS LT0520 HISTORY - 1973 SEE DESCRIPTION NGS LT0520 HISTORY - 19910617 GOOD NGS LT0520 LT0520 STATION DESCRIPTION LT0520 LT0520'DESCRIBED BY COAST AND GEODETIC SURVEY 1931 (JB) LT0520'ABOUT 12 MILES SOUTH-SOUTHEAST OF SUSANVILLE, ON SECOND HIGHEST LT0520'POINT OF THOMPSON PEAK. TO REACH FROM SUSANVILLE POST OFFICE, LT0520'GO SOUTHEAST 15.0 MILES ON RENO ROAD, TURN RIGHT ONTO DIRT ROAD LT0520'JUST TO WEST OF SMALL STREAM AND SEVERAL SMALL DESERTED SHACKS LT0520'AND GO 2.9 MILES, TAKE RIGHT FORK AND GO 1.4 MILES, TAKE RIGHT LT0520'FORK AND GO 1.2 MILES, TAKE LEFT FORK AND GO 0.9 MILE, TAKE LT0520'RIGHT FORK WHICH TURNS BACK SHARPLY AT U.S. FOREST SERVICE LT0520'SIGN, AND CONTINUE ON THIS ROAD TO TOP OF MOUNTAIN. ROAD ENDS LT0520'100 YARDS FROM STATION SITE. MARKED BY STANDARD STATION LT0520'DISK IN BEDROCK, NOTE 2. REFERENCE MARKS ARE STANDARD LT0520'REFERENCE DISKS IN BEDROCK, NOTE 12A. NO. 1 IS 45.76 FEET LT0520'FROM STATION IN AZIMUTH 122 DEG 11 MIN. NO. 2 IS 132.75 FEET LT0520'FROM STATION IN AZIMUTH 323 DEG 05 MIN. THOMPSON PEAK, FIRE LT0520'LOOKOUT TOWER IS 58.3 METERS (191 FEET) FROM STATION IN LT0520'AZIMUTH 323 DEG 41 MIN. AZIMUTH FROM STATION TO KETTLE ROCK, LT0520'FIRE LOOKOUT TOWER IS 47 DEG 20 MIN 53 SEC. LT0520 LT0520 STATION RECOVERY (1931) LT0520 LT0520'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1931 LT0520'RECOVERED IN GOOD CONDITION. LT0520 LT0520 STATION RECOVERY (1935) LT0520 LT0520'RECOVERY NOTE BY US GEOLOGICAL SURVEY 1935 LT0520'STATION AND REFERENCE MARKS FOUND AS DESCRIBED. MARK APPARENTLY LT0520'UNDISTURBED. STAMPED THOMPSON 1931. LT0520 LT0520 STATION RECOVERY (1948) LT0520 LT0520'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1948 (WRH) LT0520'THE STATION WAS RECOVERED AS DESCRIBED, AND THE STATION AND TWO LT0520'REFERENCE MARKS WERE FOUND IN GOOD CONDITION. A NEW DESCRIPTION LT0520'FOLLOWS. LT0520' LT0520'THE STATION IS LOCATED ON THE SECOND HIGHEST POINT OF THOMPSON LT0520'PEAK, ABOUT 12 MILES SOUTH SOUTHWEST OF SUSANVILLE, ABOUT 6 LT0520'MILES WEST OF JANESVILLE, AND 192 FEET NORTHWEST OF THE THOMPSON LT0520'PEAK LOOKOUT TOWER. LT0520' LT0520'THE STATION MARK IS STANDARD DISK, STAMPED THOMPSON 1931, SET LT0520'INTO A DRILL HOLE IN OUTCROPPING BEDROCK WHICH PROJECTS ABOUT LT0520'4 INCHES. LT0520' LT0520'REFERENCE MARK NUMBER 1 IS A STANDARD DISK, STAMPED THOMPSON LT0520'NO 1 1931, SET INTO A DRILL HOLE IN OUTCROPPING BEDROCK WHICH LT0520'PROJECTS ABOUT 3 FEET AND IS ABOUT THE SAME ELEVATION AS THE LT0520'STATION. LT0520' LT0520'REFERENCE MARK NUMBER 2 IS A STANDARD DISK, STAMPED THOMPSON LT0520'NO 2 1931, SET INTO A DRILL HOLE IN OUTCROPPING BEDROCK WHICH LT0520'PROJECTS ABOUT 10 INCHES AND IS ABOUT THE SAME ELEVATION AS THE LT0520'STATION. LT0520' LT0520'THE AZIMUTH MARK IS A U.S. COAST AND GEODETIC SURVEY BENCH MARK, LT0520'STAMPED V843 1947, SET INTO A DRILL HOLE IN A CONCRETE CULVERT LT0520'WHICH PROJECTS ABOUT 6 INCHES. IT IS LOCATED ALONG U.S. HIGHWAY LT0520'395, ABOUT 60 FEET WEST OF THE JUNCTION OF U.S. HIGHWAY 395 LT0520'AND THE DIRT ROAD TO THOMPSON PEAK LOOKOUT TOWER, AND ABOUT LT0520'15 FEET SOUTH OF THE CENTERLINE OF U.S. HIGHWAY 395. LT0520' LT0520'TO REACH, FROM THE U.S. POST OFFICE IN JANESVILLE, GO EAST, ON LT0520'U.S. HIGHWAY 395, FOR 1.5 MILES TO SIDE ROAD RIGHT AND THE LT0520'AZIMUTH MARK. TURN RIGHT, AS PER SIGN THOMPSON PEAK LOOKOUT LT0520'12, AND GO SOUTHERLY 10.0 MILES TO THE HIGHEST POINT OF LT0520'THOMPSON PEAK AND THE LOOKOUT TOWER. THENCE PACK, NORTHERLY, FOR LT0520'ABOUT 200 YARDS TO THE STATION SITE. LT0520' LT0520'THOMPSON PEAK LOOKOUT TOWER IS LOCATED ON THE HIGHEST POINT OF LT0520'THOMPSON PEAK. IT IS ABOUT 20 FEET SQUARE, 30 FEET HIGH, LT0520'PAINTED WHITE, AND OF WOOD STRUCTURE. LT0520 LT0520 STATION RECOVERY (1949) LT0520 LT0520'RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1949 (WRH) LT0520'THE STATION MARK, REFERENCE MARKS AND THE AZIMUTH MARK WERE LT0520'RECOVERED AND FOUND TO BE IN GOOD CONDITION. A NEW DESCRIPTION LT0520'FOLLOWS-- LT0520' LT0520'THE STATION IS LOCATED ON THE SECOND HIGHEST POINT OF LT0520'THOMPSON PEAK, ABOUT 12-1/2 MILES AIRLINE SOUTH-SOUTHEAST OF LT0520'SUSANVILLE, ABOUT 3 MILES AIRLINE SOUTHWEST OF JANESVILLE AND LT0520'ABOUT 3-1/2 MILES AIRLINE WEST-SOUTHWEST OF BUNTINGVILLE. LT0520' LT0520'THE STATION MARK IS A STANDARD DISK STAMPED THOMPSON 1931 SET LT0520'IN A DRILL HOLE IN BEDROCK THAT PROJECTS ABOUT 3 INCHES ABOVE LT0520'THE GROUND. LT0520' LT0520'REFERENCE MARK NUMBER 1 IS A STANDARD DISK STAMPED THOMPSON NO 1 LT0520'1931 SET IN A DRILL HOLE IN BEDROCK THAT PROJECTS ABOUT 3 FEET LT0520'ABOVE THE GROUND. IT IS ABOUT 1 FOOT HIGHER THAN THE STATION. LT0520' LT0520'REFERENCE MARK NUMBER 2 IS A STANDARD DISK STAMPED THOMPSON LT0520'NO 2 1931 SET IN A DRILL HOLE IN BEDROCK THAT PROJECTS 1 FOOT LT0520'ABOVE THE SURROUNDING ROCK. IT IS ABOUT THE SAME ELEVATION AS LT0520'THE STATION. LT0520' LT0520'THE AZIMUTH MARK IS A STANDARD BENCH-MARK DISK STAMPED V843 1947 LT0520'SET IN A DRILL HOLE IN THE TOP OF A CONCRETE CULVERT THAT IS LT0520'FLUSH WITH THE SURFACE OF THE ROAD. IT IS 1.9 FEET EAST OF A LT0520'WHITE POST, ABOUT 90 FEET WEST OF THE JUNCTION OF U.S. HIGHWAY LT0520'395 AND A SIDE ROAD THAT GOES TO THE RIGHT, AND 13.0 FEET SOUTH LT0520'OF THE CENTER LINE OF U.S. HIGHWAY 395. LT0520' LT0520'THOMPSON PEAK LOOKOUT IS LOCATED ON THE HIGHEST POINT OF THOMPSON LT0520'PEAK AND IS BUILT ON ROCK THAT IS ABOUT 8 FEET HIGHER THAN THE LT0520'STATION. IT IS A WOODEN BUILDING, PAINTED WHITE, ABOUT 20 FEET LT0520'SQUARE AND THE TOP OF THE ROOF IS ABOUT 30 FEET ABOVE THE LT0520'GROUND. LT0520' LT0520'TO REACH THE STATION FROM THE POST OFFICE IN JANESVILLE, GO LT0520'1.5 MILES EAST ON U.S. HIGHWAY 395 TO A SIDE ROAD AND THE AZIMUTH LT0520'MARK ON THE RIGHT. TURN RIGHT AS PER SIGN THOMPSON PEAK LOOKOUT LT0520'12 MI. AND GO SOUTHERLY 10.1 MILES TO THE HIGHEST POINT AND LT0520'THE LOOKOUT. PACK NORTHERLY, PAST THE LOOKOUT, ABOUT 200 YARDS LT0520'TO THE STATION. LT0520 LT0520 STATION RECOVERY (1973) LT0520 LT0520'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1973 (CLN) LT0520'THE STATION MARK, REFERENCE MARKS 1 AND 2, AND THOMPSON PEAK LT0520'LOOKOUT TOWER 1948 WERE RECOVERED IN GOOD CONDITION. THE LT0520'AZIMUTH MARK (BM V 843) HAS EVIDENTLY BEEN DESTROYED DURING LT0520'ROAD CONSTRUCTION SO A NEW AZIMUTH MARK WAS ESTABLISHED ON THIS LT0520'DATE. THE DISTANCES AND DIRECTIONS TO REFERENCE MARKS 1 AND 2 LT0520'AND TO THOMPSON PEAK LOOKOUT TOWER 1948 MEASURED ON THIS DATE LT0520'AGREED WITH THE 1948 AND 1949 MEASUREMENTS. THE PREVIOUS LT0520'DESCRIPTIONS ARE ADEQUATE WITH THE FOLLOWING ADDITIONS-- LT0520' LT0520'TO REACH THE STATION FROM THE POST OFFICE AT JANESVILLE GO LT0520'SOUTHEAST ON COUNTY ROAD 235 FOR 1.0 MILE TO THE JUNCTION OF LT0520'U.S. HIGHWAY 395 AND COUNTY ROADS 235 AND 208. TURN RIGHT LT0520'AND GO SOUTH AND SOUTHWEST ON COUNTY ROAD 208 (FOREST SERVICE LT0520'ROAD 28N01) 5.1 MILES TO A FORK. TAKE THE RIGHT FORK AS/SIGN LT0520'THOMPSON PK. L.O. 6 AND GO SOUTH AND SOUTHWEST 1.3 MILES TO A LT0520'FORK. TAKE THE RIGHT FORK AND GO WEST 1.2 MILES TO A FORK. LT0520'TAKE THE RIGHT FORK AND GO NORTH 2.7 MILES TO THE END OF THE LT0520'ROAD AT THE THOMPSON PEAK LOOKOUT. PACK NORTHWESTERLY PAST THE LT0520'LOOKOUT ABOUT 100 YARDS TO THE STATION SITE. LT0520' LT0520'THE AZIMUTH MARK SET ON THIS DATE IS LOCATED ABOUT 1/4 MILE LT0520'NORTHWEST OF THE STATION AND ON THE SAME RIDGE ON WHICH THE LT0520'STATION IS LOCATED. THE MARK IS A NGS REFERENCE MARK DISK LT0520'STAMPED THOMPSON 1931 NO 3 1973 CEMENTED IN A DRILL HOLE IN THE LT0520'TOP OF A 1-1/2 X 3-FOOT OUTCROPPING ROCK PROJECTING 0.1 FOOT LT0520'ABOVE THE GROUND AND IS ABOUT 75 FEET NORTH OF AND 4 FEET LOWER LT0520'THAN THE HIGHEST POINT IN THE IMMEDIATE AREA AND IS 1.5 FEET LT0520'SOUTHEAST OF A 2-FOOT CAIRN. LT0520' LT0520'TO REACH THE AZIMUTH MARK FROM THE STATION SITE PACK NORTHWEST LT0520'ALONG THE RIDGE ABOUT 1/4 MILE TO THE MARK. LT0520' LT0520'AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--3 MILES LT0520'SOUTHWEST OF JANESVILLE LT0520 LT0520 STATION RECOVERY (1991) LT0520 LT0520'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1991 LT0520'THE STATION IS LOCATED ABOUT 12.5 MI (20.1 KM) SOUTH-SOUTHEAST OF LT0520'SUSANVILLE, 3.5 MI (5.6 KM) WEST-SOUTHWEST OF BUNTINGVILLE, 3 MI LT0520'(4.8 KM) SOUTHWEST OF JANESVILLE AND ON THE SECOND HIGHEST POINT OF LT0520'THOMPSON PEAK. LT0520'TO REACH THE STATION FROM THE POST OFFICE IN JANESVILLE, GO SOUTHEAST LT0520'ON COUNTY ROAD 235 FOR 1.0 MI (1.6 KM) TO THE JUNCTION OF U.S. LT0520'HIGHWAY 395 AND COUNTY ROADS 235 AND 208. TURN RIGHT AND GO SOUTH LT0520'AND SOUTHWEST ON ROAD 208 (FOREST SERVICE ROAD 28N01) FOR 5.1 MI LT0520'(8.2 KM) TO A FORK. TAKE THE RIGHT FORK, AS PER SIGN, THOMPSON PK. LT0520'L.O. 6 AND GO SOUTH AND SOUTHWEST FOR 1.3 MI (2.1 KM) TO A FORK. TAKE LT0520'THE RIGHT FORK AND GO WEST FOR 1.2 MI (1.9 KM) TO A FORK. TAKE THE LT0520'RIGHT FORK AND GO NORTH FOR 2.7 MI (4.3 KM) TO THE END OF THE ROAD AT LT0520'THE THOMPSON PEAK LOOKOUT. PACK NORTHWESTERLY PAST THE LOOKOUT FOR LT0520'ABOUT 300 FT (91.4 M) TO THE STATION. LT0520'THE STATION IS A STANDARD DISK SET IN A DRILL HOLE IN BEDROCK, LT0520'PROJECTING 3 INCHES ABOVE THE GROUND.