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i <br /> WELL CONWTRATIONS <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 ID Date TPPH B T £ X 8020 8260 TOC Water Elevation Thickness Reading <br /> u IL u IL u IL ug/L)( u IL (ug/L (ug/L 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 /> nln= Pre-purge/Post-purge <br /> I <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 /> 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 19 <br />