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i S <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> Stockton, CA <br /> MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPH $ T E X 8020 8260 DIPE ETBE TAME TBA Ethanol Methanol 1,2-DCA EDB TOC Water Elevation Thickness <br /> u /L u /L u IL a IL u 1L u IL u IL u IL u IL u !L u IL u IL u IL u /L u IL MSLft MSL ft <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B pnor to May 11 2001,analyzed by EPA Method 8015 <br /> TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> STEX=Benzene toluene,ethylbenzene,xylenes by EPA Method 8260B prior to May 11,2001 analyzed by EPA Method 8020 <br /> MTBE=Methyl tertiary butyl ether <br /> RIPE=Di-isopropyl ether analyzed by EPA Method 8260B <br /> ETBE=Ethyl terbary butyl ether analyzed by EPA Method 82608 <br /> TAME=Tertiary amyl methyl ether analyzed by EPA Method 8260B <br /> TBA=Tertiary butyl alcohol analyzed by EPA Method 8260B <br /> 1,2-DCA=1,2-Dichloroethane,analyzed by EPA Method 82608 <br /> EDB=Ethylene dibromide analyzed by EPA Method 8260B <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> ug1L=Parts per billion <br /> MSL=Mean Sea Level <br /> ft =Feet <br /> <n=Below detection limit <br /> c <br /> NA=Not Applicable <br /> I <br /> Page 13 <br />