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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> J� 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 /> u IL (u /L) (u IL) ug/L) (ug/L u IL) (uglL (MSL) (ft) ft 1nnM1 <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 <br /> BTEX= benzene,toluene,ethylbenzene,xylenes by EPA Method 8020 <br /> 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 /> 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 /> j Notes <br /> = Field data sheets for this event misplaced, no field measurements available for this event <br /> *`W MTBE confirmed, Benzene did not confirm by GC/MS <br /> a=Analysis was run past recommended hold time <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 18 <br />