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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 MTBEDepth to GW SPH DO <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness Reading <br /> u u IL u IL u /L u /L u /L u /L MSL ftMSL 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 GUMS <br /> a=Analysis was run past recommended hold time <br /> b=Result was generated out of gold 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,by 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 /> i <br /> Page 21 <br />