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i <br /> WELL CONCENTRATIONS <br /> Former Shell Service Station <br /> 1313 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 /> u /L u /L u /L uIL uIL u1L uIL u /L uIL u /L u /L u /L ug/L) u /L MSL ft MSL <br /> MW-5 10/09/2003 <50 <0 50 <0 50 <0 50 <1 0 -1050 1 <2 0 <2 0 <2 0 <5 0 NA <50 4 4 <0 50 18 75 4442 -25 67 <br /> MW-5 01/16/2004 <60 <0 50 00 50 <0 50 <1 0 <050_[_ <20 <2 0 <20 <50 <500 <50 42 <0 50 18 75 4391 -2516 <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608 <br /> BTEX=Benzene,toluene,ethylbenzene,xylenes by EPA Method 82608 <br /> MTBE=Methyl-tertiary-butyl ether <br /> DIPE=Dusopropyl ether <br /> ETBE=Ethyl tertiary butyl ether <br /> TAME=Tertiary amyl methyl ether <br /> TBA=Tertiary butanol <br /> 1,2-DCA=1,2-Dichloroethane <br /> EDS=1,2-Dibromoethane(ethylene dibromide) <br /> TOC=Top of Casing Elevation <br /> GW=Groundwater <br /> uglL=Parts per billion <br /> MSL=Mean sea level <br /> ft=Feet <br /> <n=Below detection lima <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,California <br /> w <br /> r <br /> i <br /> P 2 <br />