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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, CA <br /> Wic #204-7524-4305 <br /> MTBE MTBE Depth to �GW SPH DO <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness Reading <br /> (ug/L (u/L (ug/L (u/L (ug/L (ug/L u IL MSL ft MSL ft m <br /> Notes <br /> '-Field data sheets for this event misplaced, no field measurements available for this event <br /> "=MTBE confirmed,Benzene did not confirm by GC/MS <br /> a=Analysis was run past recommended hold time <br /> b=Result was generated out of hold time <br /> c=TPPH analyzed by modified EPA Method 8015 and BTEX analyzed by EPA Method 8020 <br /> d= Insufficient water to record measurement <br /> e=Top of casing elevation altered during wellhead maintenance <br /> f=Site wells surveyed to mean sea level on February 20,2002, 1 Virgil Chavez Land Surveying of Vallejo,California Previous elevations referenced to site datum <br /> When separate-phase hydrocarbons are present,ground water elevation is adjusted using the relation <br /> Corrected ground water elevation=Top-of-casing elevation-depth to water+ (0 8 x hydrocarbon thickness) <br /> 4 <br /> Pa 2 <br />