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WELL CONCE TRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, CA <br /> Wic #204-7524-4305 <br /> MTBE MTBE Depth to GW SPH DO <br /> Well I❑ Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness Reading <br /> (ug/L (ug/L (ug/L u IL (ug/L (ug/L (ug/L MSL ft. MSL ft. m <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 /> 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 />