1 National Geodetic Survey, Retrieval Date = NOVEMBER 1, 2002 JT0275 *********************************************************************** JT0275 DESIGNATION - F 466 JT0275 PID - JT0275 JT0275 STATE/COUNTY- CA/SONOMA JT0275 USGS QUAD - SEARS POINT (1968) JT0275 JT0275 *CURRENT SURVEY CONTROL JT0275 ___________________________________________________________________ JT0275* NAD 83(1992)- 38 07 33.57629(N) 122 29 21.70262(W) ADJUSTED JT0275* NAVD 88 - 0.37 (meters) 1.2 (feet) GPS OBS JT0275 ___________________________________________________________________ JT0275 EPOCH DATE - 1997.30 JT0275 X - -2,698,489.548 (meters) COMP JT0275 Y - -4,237,516.158 (meters) COMP JT0275 Z - 3,916,435.294 (meters) COMP JT0275 LAPLACE CORR- -1.80 (seconds) DEFLEC99 JT0275 ELLIP HEIGHT- -31.60 (meters) GPS OBS JT0275 GEOID HEIGHT- -31.88 (meters) GEOID99 JT0275 JT0275 HORZ ORDER - FIRST JT0275 ELLP ORDER - FOURTH CLASS I JT0275 JT0275.The horizontal coordinates were established by GPS observations JT0275.and adjusted by the National Geodetic Survey in July 1998. JT0275.The horizontal coordinates are valid at the epoch date displayed above. JT0275.The epoch date for horizontal control is a decimal equivalence JT0275.of Year/Month/Day. JT0275 JT0275.The orthometric height was determined by GPS observations and a JT0275.high-resolution geoid model using precise GPS observation and JT0275.processing techniques. JT0275 JT0275.The X, Y, and Z were computed from the position and the ellipsoidal ht. JT0275 JT0275.The Laplace correction was computed from DEFLEC99 derived deflections. JT0275 JT0275.The ellipsoidal height was determined by GPS observations JT0275.and is referenced to NAD 83. JT0275 JT0275.The geoid height was determined by GEOID99. JT0275 JT0275; North East Units Scale Converg. JT0275;SPC CA 2 - 551,104.927 1,957,089.700 MT 1.00005346 -0 18 30.7 JT0275;SPC CA 2 - 1,808,083.41 6,420,885.12 sFT 1.00005346 -0 18 30.7 JT0275;UTM 10 - 4,219,917.536 544,755.996 MT 0.99962467 +0 18 55.0 JT0275 JT0275 SUPERSEDED SURVEY CONTROL JT0275 JT0275 NAD 83(1992)- 38 07 33.57584(N) 122 29 21.70234(W) AD(1997.30) 1 JT0275 ELLIP HT - -31.53 (m) GP(1997.30) 3 2 JT0275 JT0275.Superseded values are not recommended for survey control. JT0275.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums. JT0275.See file dsdata.txt to determine how the superseded data were derived. JT0275 JT0275_MARKER: DB = BENCH MARK DISK JT0275_SETTING: 34 = CONCRETE HEADWALL JT0275_STAMPING: F 466 1950 JT0275_MARK LOGO: CGS JT0275_MAGNETIC: N = NO MAGNETIC MATERIAL JT0275_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO JT0275+STABILITY: SURFACE MOTION JT0275_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR JT0275+SATELLITE: SATELLITE OBSERVATIONS - February 19, 1997 JT0275 JT0275 HISTORY - Date Condition Report By JT0275 HISTORY - 1950 MONUMENTED CGS JT0275 HISTORY - 1964 GOOD NGS JT0275 HISTORY - 1985 GOOD USPSQD JT0275 HISTORY - 1987 GOOD NGS JT0275 HISTORY - 19970219 GOOD NGS JT0275 HISTORY - 20000606 GOOD NGS JT0275 JT0275 STATION DESCRIPTION JT0275 JT0275'DESCRIBED BY NATIONAL GEODETIC SURVEY 1964 JT0275'1.8 MI NE FROM BLACK POINT. JT0275'0.2 MILE WEST ALONG HARBOR DRIVE FROM THE BLACK POINT INN JT0275'AT BLACK POINT, THENCE 1.6 MILES NORTHEAST ALONG STATE HIGHWAY JT0275'37, 1.0 MILE NORTHEAST OF THE MARIN-SONOMA COUNTY LINE, 0.9 JT0275'MILE NORTHEAST OF THE NORTHEAST END OF A CONCRETE BRIDGE OVER JT0275'PETALUMA RIVER, AT DOUBLE 4 X 6-FOOT CONCRETE BOX CULVERT A2 JT0275'296+35, IN THE TOP OF THE SOUTHEAST CONCRETE HEADWALL, 28.1 FEET JT0275'SOUTHEAST OF THE CENTERLINE OF THE NORTHEAST-BOUND LANE OF THE JT0275'HIGHWAY, 0.6 FOOT NORTHEAST OF THE SOUTHWEST END OF THE HEADWALL, JT0275'AND ABOUT 2 FEET LOWER THAN THE HIGHWAY. JT0275 JT0275 STATION RECOVERY (1985) JT0275 JT0275'RECOVERY NOTE BY US POWER SQUADRON 1985 JT0275'RECOVERED IN GOOD CONDITION. JT0275 JT0275 STATION RECOVERY (1987) JT0275 JT0275'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1987 JT0275'RECOVERED IN GOOD CONDITION. A NEW TO REACH FOLLOWS. 10.1 KM JT0275'(6.30 MI) NORTHERLY ALONG U.S. HIGHWAY 101 FROM THE JUNCTION OF SAN JT0275'PEDRO ROAD IN SAN RAFAEL, THENCE 7.3 KM (4.55 MI) NORTHEASTERLY ALONG JT0275'STATE HIGHWAY 37. JT0275 JT0275 STATION RECOVERY (1997) JT0275 JT0275'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1997 (JDD) JT0275'THE STATION WAS RECOVERED. IT IS ABOUT 5 MI (8.0 KM) EAST OF THE TOWN JT0275'OF NOVATO ALONG STATE HIGHWAY 37. TO REACH THE STATION FROM THE JT0275'INTERSECTION OF HIGHWAY 101 AND STATE HIGHWAY 37 ABOUT I MI SOUTHEAST JT0275'OF NOVATO GO NORTHEAST ON STATE HIGHWAY 37 FOR ABOUT 3.4 MI (5.5 KM) JT0275'TO THE MARIN-SONOMA COUNTY LINE OVER THE PETALUMA RIVER. CONTINUE JT0275'NORTHEAST ON HIGHWAY 37 FOR 0.9 MI (1.4 KM) TO A SIDE ROAD RIGHT, THE JT0275'ENTRANCE TO PORT SONOMA MARINA. CONTINUE NORTHEAST FOR ABOUT 0.2 MI JT0275'(0.3 KM) TO THE STATION ON THE RIGHT AT HIGHWAY POST MILE 1.13. THE JT0275'STATION IS ABOUT 0.2 MI (0.3 KM) NORTHEAST OF THE ENTRANCE TO THE PORT JT0275'SOMOMA MARINA. IT IS ABOUT 215 FT (65.5 M) NORTHEAST OF AN EMERGENCY JT0275'ROADSIDE CALL BOX, SN 37-012, 28.1 FT (8.6 M) SOUTHEAST OF THE JT0275'NORTHEAST-BOUND LANES OF HIGHWAY 37. IT IS IN THE TOP OF A CONCRETE JT0275'CULVERT HEADWALL, 0.6 FT (0.2 M) NORTHEAST OF THE SOUTHWEST END OF THE JT0275'HEADWALL AND ABOUT 2 FT (0.6 M) LOWER THAN THE HIGHWAY. NOTE - FOR JT0275'SAFETY REASONS THE VEHICLE SHOULD BE PARKED NEAR THE ENTRANCE TO THE JT0275'PORT SONOMA MARINA. JT0275 JT0275 STATION RECOVERY (2000) JT0275 JT0275'RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 2000 (MEI) JT0275'RECOVERED AS DESCRIBED WITH THE FOLLOWING CHANGES. JT0275'PORT SONOMA MARINA IS AT 270 SEARS PT RD. THERE IS ENOUGH SHOULDER ON JT0275'HWY 37 SO THAT SAFE PARKING IS AVAILABLE IN THE VICINITY OF THE MARK. JT0275'THIS STATION WAS OBSERVED IN FEB, 2000 AS PART OF THE HAMILTON FIELD JT0275'GEODETIC/TIDAL DATUMS DETERMINATION STUDY.