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FE <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> Vii South Tracy Boulevard <br /> I ' Tracy, CA <br /> I <br /> 4 MTBE MTBE Depth to GW <br /> Well ID Date TPPH TEPH B T E X 8020 8260 DIPE ETBE TAME TBA Methanol Ethanol TOC Water Elevation <br /> u /L u IL u 2 a /L u IL u IL it IL u ILu u IL u IL u IL u IL u IL u MSL ft MSL <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbonsas gasoline by EPA Method 8260B, pnor to January 23,2001, analyzed by EPA Method 8015 <br /> r r <br /> TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015 I <br /> BTEX=Benzene,toluene,ethylbenzenet xylenes by EPA Method 8260B,pnor to January 23,2001,analyzed by EPA Method 8020 <br /> MTBE=Methyl tertiary butyl ether I� i - <br /> DIPE=DE-isopropyl ether, analyzed by EPA Method 8260B <br /> ETRE=Ethyl tertiary butyl ether, analyzed by EPA Method 82608 <br /> TAME=Tertiary amyl methyl ether,analyzed by EPA Method 8260B <br /> TBA=Tertiary butyl alcohol,analyzed byr EPA Method 6260B I i <br /> TOC=Top of Casing Elevation r <br /> GW=Groundwater c ', - - <br /> RW=Rediscovered well <br /> u IL=Parts per bon <br /> MSL=Mean sea levet +_ _ <br /> ft =Feet <br /> r _ _ <br /> <n=Below detection limit <br /> (D)=Duplicate sample <br /> NA=Not applicable € - <br /> ii <br /> Notes - <br /> a=Hydrocarbon does not match the laboratory standard <br /> Ethanol and Methanol analyzed by EPA Method 8260B <br /> Wells MW-1 through MW-3,were decommissioned in July 1990 during station reconstnucbon and replaced by MWAA through MW-3A in August 1990 r <br /> 1 s f k - <br /> Site surveyed February 24,2002 by Virgil Chavez Land Surveying of Vallejo;CA <br /> E = <br /> f <br /> 1 <br /> • I — E —.. a -� ti -� <br /> f Page 8 <br />