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1 <br /> ' CONDOR EARTH TECHNOLOGIES INC <br /> } 21663 Brian Lane <br /> Sonora CA 95370 <br /> Phone 209.532.0361 <br /> CONDOR® FAX 209.532.0773 <br /> www.condorearth.com <br /> ' March 8, 2007 <br /> RE: City of Manteca W WTP <br /> ' WELL CASING SURVEY—Conducted February 6, 2007 <br /> ' Surveyor's Report <br /> Survey control was brought into the site by"static'GPS methods. The positions of the monitor wells and <br /> site benchmarks as surveyed are referenced to California Coordinate System Zone 3, NAD83 horizontal <br /> ' datum by post-processing static data collected at the base station with data from the Condor (CNDR) <br /> Continuously Operating Reference Station (CORS). NAVD88 vertical datum was brought into the site <br /> by post-processing static data collected at the base station and at NGS Benchmark HS0137, El. 17.15. <br /> ' The wells were located horizontally and vertically using static GPS methods in combination with <br /> conventional methods. Elevation on the surveyed wells were measured at the access plug of the well <br /> casing and determined by Topcon AT-G3 Autolevel from a remote survey point (chiseled "X" or <br /> ' concrete nail). The predictable repeatability of the established positions and elevations of the wells is <br /> 0.03 foot, plus or minus. This precision meets the "allowable discrepancy" specification for a second <br /> (2nd) order forward and backward level run, with a one-mile range between benchmarks. This survey was <br /> ' conducted under the supervision of Stan Kirkwood, P.L.S. 4096. <br /> SURVEY <br /> ' POINT at <br /> GROUND MEASURING <br /> WELL LATITUDE LONGITUDE NORTHING EASTING SURFACE POINT <br /> Cal.Zone 3 CaL Zone 3 <br /> ' U.S.Snry ey Ft U.S.St Ft. AVD88 MS.L.FL AVD88 M.S.L.Ft. <br /> —mw-11 37.7938965 -121.2583445 2112425.36 6342547.01 33.99 1 36.58 <br /> ' NA4654 C4yo[MmteeaA654\srveA654b Sa Rgon.d <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br />