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i <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, CA <br /> MTBE MTBE Depth to GW SPH DO <br /> Well ID Date TPPH B T E Xi-(uq/Q <br /> 8020 8260 TOC Water Elevation Thickness Reading <br /> u /L u IL u IL u IL a IL u L MSL ft MSL ftm <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, byV�rgd Chavez Land Surveying of Vallejo, California Previous elevations referenced to site datum <br /> When separate-phase hydrocarbons are present,ground water elevation III <br /> s adjusted using the relation <br /> Corrected ground water elevation=Top-of-casing elevation-depth to water +(0 8 x hydrocarbon thickness) <br /> F <br /> P 22 • <br />