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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 3725 South Tracy Boulevard <br /> Tracy, CA <br /> MTBE MTBE Depth to GW <br /> Well ID Date TPP H TEPH B T E X 8020 8260 DIPS ETRE TAME TBA Methanol Ethanol TO Water Elevation <br /> u /L u IL u IL u IL a /L hin, <br /> a IL u IL u IL u IL u IL u IL a IL u IL MSL ft MSL <br /> RW 06/05/2001 73 NA 1 0 21 071 56 NA <0 50 NA NA JNA NA NA NA NA 534 NA <br /> RW 01/22/2003 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 469 NA <br /> RW 01/30/2003 <50 NA <0 50 <0 50 <0 50 <0 50 NA <0 50 <2 0 <2 0 <2 0 <50 <1,000 <500 NA 474 NA <br /> RW 04/28/2003 linable to locate NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82606, prior to January 23,2001, analyzed by EPA Method 8015 <br /> TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX=Benzene,toluene, ethylbenzene,xylenes by EPA Method 8260B, prior to January 23,2001,analyzed by EPA Method 8020 <br /> MTBE=Methyl tertiary butyl ether <br /> DIPS W Di-isopropyl ether,analyzed by EPA Method 8260B <br /> ETBE=Ethyl tertiary butyl ether,analyzed by EPA Method 8260B <br /> TAME=Tertiary amyl methyl ether, analyzed by EPA Method 8260B <br /> TBA=Tertiary butyl alcohol,analyzed by EPA Method 82608 <br /> TOC=Top of Casing Elevation <br /> GW=Groundwater <br /> RW=Rediscovered well <br /> ug1L=Parts per billion <br /> j MSL=Mean sea level <br /> ft =Feet <br /> <n=Below detection limit <br /> (D)=Duplicate sample <br /> NA=Not applicable <br /> Notes <br /> a=Hydrocarbon does not match the laboratory standard <br /> Ethanol and Methanol analyzed by EPA Method 8260B <br /> Wells MWA through MW-3,were decommissioned in July 1990 during station reconstruction and replaced by MW-1A through MW-3A in August 1990 <br /> Site surveyed February 24,2002 by Virgil Chavez Land Surveying of Vallejo, CA <br /> Page 7 <br />