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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 /> (ug/L (u/L (u/L (u/L .__(22/L (ug/L MSL ft MSL <br /> MW-5 07/11/2003 <50 <0 50 <0 50 <0 50 <1 0 <0 50 1875 43 15 -2440 <br /> MW-5 10109/2003 <50 <0 50 <0 50 <0 50 <1 0 <0 50 1875 4442 -2567 <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608 <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 /> Pa e 2 <br />