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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 Dale TPPH B T E X 8020 8260 DIPE ETBE TAME TBA 1,2 DCA EDB Ethanol Methanol TOC <br /> Water Elevation Thickness Reading <br /> u u u u L u L u L u u L u fL u L u L u IL u !L u fL u 2 MSL fl MSL ft m <br /> Abbrwabons <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608,prior to November 21,2000 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=Methyl tedlary butyl ether <br /> DIPE=DHsopropyl ether,analyzed by EPA Method 8260B <br /> ETBE=Ethyl lerbary butyl ether,analyzed by EPA Method 82608 <br /> TAME =Tertiary amyl methyl ether,analyzed by EPA Method 82606 <br /> TBA=Tertiary butyl alcohol or tertlary butanol,analyzed by EPA Method 82608 <br /> 1,2 OCA=1,2 Dlrhloroelhane,analyzed by EPA Method 82608 <br /> EDB=Ethylene dibromide,onelyzed by EPA Method 82606 <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> DO=Dissolved Oxygen <br /> uglL=Parts per Millon <br /> ppm=Parts per milllon <br /> MSL=Mean sea levet <br /> n =Feet <br /> m=Below detection Iifntt <br /> (D)=Duplicate sample <br /> NA=Not appirrable <br /> rJn=Pro-purgelPost-purga <br /> Notes <br /> a=Analyals was run past recommended hold Urns <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=Insuffident 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 20,20D2 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 /> h=The concentratlon reported railecls[ndrvldual or discrete unrdentlfied peaks not matchlrhg a typical fuel pattern <br /> I=Quantity of unknown hydrocarbon(s)In sample biased on gasoline <br /> '=Field data shoals for this event misplaced no field measurements available for this event <br /> MTBE confirmed,Benzene did not confirm by GC/MS <br /> Ethanol and Methanol analyzed by EPA Method 8260B <br /> When separate phase hydrocarbons are present,ground water elevation is adjusted using the rotation Corrected ground water elevation=Top-of-casing elevation-depth to water+(0 8 x hydrocarbon thickness). <br /> Page 19 <br />