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• WELL COANTRATIONS • <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 X 8020 8260 TOC Water Elevation Thickness Reading <br /> u IL u IL u IL u IL u IL u L u /L MSL f# MSL ft m <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by EPA Method 82608, prior to November 21, 2000, analyzed by EPA Method 8015,except where noted <br /> BTEX= Benzene,toluene,ethylbenzene,xylenes by EPA Method 8260B, prior to November 21,2000, analyzed by EPA Method 8020, except where noted <br /> j MTBE=Methyl-tertiary-butyl ether <br /> TOC=Top of Casing Elevation <br /> SPH =Separate-Phase Hydrocarbons <br /> GW =Groundwater <br /> DO=Dissolved Oxygen <br /> ug/L=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 /> nln=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 />