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WELL CONCENTRATIONS <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 TBA DIPS ETBE TAME 1,2-DCA EDB Ethanol Methanol To Water Elevation Thickness Reading <br /> u IL (u21) u 1L u 1L u 1L u IL u IL ul��f IL u IL u 1L u fl u 1L u IL u 1L u 1L MSL ft MSL ft m <br /> Abbreviations J <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82606 prior to November 21 20100 analyzed by EPA Method 8015 except where noted <br /> BTEX=Benzene toluene ethylbenzene xylenes by EPA Method 82608,prior to November 21 2000 analyzed by EPA Method 8020 except where noted <br /> MTBE=Mothyl tertiary butyl ether <br /> TBA=Tertiary butyl alcohol or tertiary butanol <br /> DIPE=Di-isopropyl ether <br /> ETBE=Ethyl tertiary butyl ether <br /> TAME =Tertiary amyl methyl ether <br /> 1,2 DCA=1,2-Dichloroethane <br /> EDB=Ethylene dibromide <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=Duplscate 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 GC1MS <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 CA Previous elevations referenced to site datum <br /> g=Hydrocarbon reported does not match the pattern of the laboratory's standard <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+(D 8 x hydrocarbon ihicicness) <br /> • Q 17 � _ <br />