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I <br /> , I <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 3725 South Tracy Boulevard <br /> SII 1 Tracy, CA <br /> MTBE MTBE Depth to GW <br /> Well ID Date TPPH I B T E EX 8020 8260 DIPS ETRE TAME TBA Methanol Ethanol TOC Water Elevation <br /> u IL u IL u IL u IL u IL u IL u L u IL u /L u IL u IL u IL u IL u IL MSL ft MSL <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82606,pnor to'January 23, 2001,analyzed by EPA Method 8015 <br /> TEPH=Total petroleum hydrocarbons asldieselby modified EPA Method 8015 <br /> BTEX=Benzene toluene eth (benzene, lanes by EPA Method 8260B,pnor to Jan u ary 23,2001,analyzed by EPA Method 8020 <br /> Y <br /> MTBE=Methyl tertiary butyl ether <br /> RIPE=Di-isopropyl ether, analyzed by EPA Method 8260B ilk <br /> ETBE=Ethyl tertiary butyl ether, analyzed by EPA Method 8260B li <br /> TAME=Tertiary amyl methyl ether, analyzed by EPA Method 8260B l h <br /> TSA=Tertiary butyl alcohol,analyzed by EPA Method 8260B I' <br /> TOC=Top of Casing Elevation I, <br /> GW=Groundwater <br /> RW=Rediscovered well <br /> u <br /> ug/L=Parts per billion I <br /> MSL=Mean sea level <br /> ft =Feet <br /> I <br /> <n=Below detection limit <br /> (D)=Duplicate sample <br /> NA=Not applicable r" <br /> II <br /> 1f <br /> Notes I I <br /> a=Hydrocarbon does not match the laboratory standard I ;' <br /> Ethanol and Methanol analyzed by EPA Method 8260B <br /> Wells MW-1 through MW-3,were decommissioned in July 1990 during station reconstruction and replaced by MW 1A through MW-3A+n August 1990 <br /> Site surveyed February 24, 2002 by Virgit Chavez Land Surveying of Vallejo, CA �, <br /> I I <br /> I <br /> a I <br /> I - <br /> Page 8 <br />