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WELL CONONTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, CA <br /> MTBE MTBEDepth to GW SPH DO <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness Reading <br /> u1L u1L u1L u1L uIL u1L) (u /Q MSL ft MSL ft m <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by EPA Method 8260B, prior to November 21, 2000, analyzed by EPA Method 8015, except where noted <br /> BTEX=Benzene,toluene,ethylbenzene,xylenes by EPA Method 82606, prior to November 21, 2000, analyzed by EPA Method 8020, except where noted <br /> MT8E=Methyl-tertiary-butyl ether <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocarbons <br /> GW = Groundwater <br /> DO =Dissolved Oxygen <br /> ug1L= Parts per billion <br /> ppm = Parts per million <br /> MSL= Mean sea level <br /> ft=Feet <br /> <n= Below detection limit <br /> D=Duplicate sample <br /> NA= Not applicable <br /> n/n= Pre-purge/Post-purge <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 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, 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 /> Page 21 <br />