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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way - <br /> Stockton, CA <br /> Wic #204-7324-4305 <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 IL u IL u IL u IL u IL u IL u IL MSL ft. MSL ft. m <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 /> 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 /> j Notes: j <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 and BTEX analyzed by EPA Method 8260B. <br /> d = Insufficient water to record measurement. <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 19 <br />