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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 DIPE ETBE TAME 7,2-ACA EDB Ethanol Methanol TOCIWater Elevation Thickness Reading <br /> ! u !LL u u !LMSL MSL ftu L u L m <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608 pnor to November 21 2000 analyzed by EPA Method 8015,except where noted <br /> BTEX a Benzene toluene,ethylbenzene xylenes by EPA Method 82608 prior to November 21,2000,analyzed by EPA Method 8020 except where noted <br /> MTBE=Methyl-tertiary-butyl ether <br /> TBA-Tertiary butyl alcohol or tertiary butanol <br /> DIPS=Dr-isopropyl ether <br /> ETRE=Ethyl tertiary butyl ether <br /> TAME a Tertiary amyl methyl ether <br /> 1 2-DCA=1 2.Otchlomethane <br /> EDS a 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 /> R=Feet <br /> <n a Below detection luno <br /> D=Duplicate 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 GUMS <br /> a=Analysts was run past recommended hold time <br /> b=Result was generated out of hold time <br /> c=TPPH anatyzed 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,Caltfomia Previous elevations referenced to site datum <br /> g=Hydrocarbon reported does not match the pattern of the laboratorys standard 1k <br /> When separate phase hydrocarbons are present ground water elevation is adjusted using the relation I4 <br /> Corrected ground water elevation=Top-of-casing elevation-depth to water+(0 8 x hydrocarbon thickness) <br /> • <br /> 0 <br /> 16 . <br />