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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 TOC Water Elevation <br /> u IL u IL (ug/L (ug/L (ug/L (ug/L MSL ft MSL <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by EPA Method 8260B <br /> STEX=Benzene,toluene,ethylbenzene,xylenes by EPA Method 8260B <br /> MTBE= Methyl-tertiary-butyl ether <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,California <br />