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WELL CONCENTRATIONS <br /> Former Shell Service Station <br /> 9313 East Charter Way <br /> Stockton, CA <br /> MTBE Depth to GW <br /> well ID Date TPPH B T E X 8260 DIPS ETBE TAME TBA Methanol Ethanol 1,2-DCA EDB TOC Water Elevation <br /> _(WLLL_ u (ug/L u /L (ug/L (ug/L u ILu IL u IL u IL u u (WIL) u MSL ftMSL <br /> M[W-5 01/14/2003 NA NA NA NA NA NA NA NA NA NA NA NA NA NA 1875 4262 -2387 <br /> MW-5 01122!2003 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <20 <2 0 <2 0 <50 <1,000 <500 73 <201875 4258 -2383 <br /> MW-5 06/30/2003 <50 <0 50 <0 50 <0 50 <1 0 <0 50 <20 <20 <2 0 <50 <500 <50 47 <0 50 1875 4298 -2423 <br /> MW-5 07/11/2003 <50 <0 50 450 <0 50 <1 0 <0 50 <2 0 <2 0 <2 0 <5 0 <500 <50 48 <0 50 1875 4315 -2440 <br /> MW-5 10/09/2003 <50 <0 50 <0 50 <0 50 <1 0 <0 50 <2 0 <2 0 <2 D <5 0 NA <50 44 <0 50 1875 4442 -2567 <br /> MW-5 01/16/2004 <50 1 <0 50 <050 <0 50 110 1050 <2 0 <2 0 <2 0 <5 0 <500 <50 42 <0 50 1875 4391 -2516 <br /> MW-5 04/28/2004 <50 <0 50 <0 50 <0 50 <1 0 <0 50 <2 0 <2 0 <20 <5 0 <500 <50 31 <0 50 1875 4291 -2416 <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608 <br /> BTEX=Benzene,toluene,ethylbenzene,xylenes by EPA Method 8260B <br /> MTBE=Methyl-tertiary-butyl ether <br /> DIPE=Diisopropyl ether <br /> ETRE=Ethyl tertiary butyl ether <br /> TAME=Tertiary amyl methyl ether <br /> TBA=Tertiary butanol <br /> 1,2-DCA=1,2-Dichloroethans <br /> EDB=1,2-Dibromoethane(Ethylene Dibromide) <br /> TOC=Top of Casing Elevation <br /> GW=Groundwater <br /> ug/L=Parts per billion <br /> MSL=Mean sea level <br /> ft=Feet <br /> <n=Below detection limit <br /> NA=Not applicable <br /> Notes <br /> a=Hydrocarbon does not match pattern of laboratory's standard <br /> b=Top of casing elevation altered during wellhead maintenance <br /> Site surveyed December 23,2002,by Virgil Chavez Land Surveying of Vallejo,CA <br /> 0 if s <br />