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• i i <br /> WELL CONCENTRATIONS <br /> Former Shell Service Station <br /> 1160 West Yosemite Avenue <br /> Manteca, CA <br /> MTBE Depth to GW <br /> Well ID Date TPPH B T E X 8260 DIPE ETBE TAME TBA 1,2-DCA EDB TOCWater Elevation <br /> (u IL u /L) (u /L) u /L u IL (u IL) (u /L u IL u IL) (u 1L u IL u /L (MSL) <br /> MSL (ft) (MSL) <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 82606 <br /> BTEX=Benzene,toluene, ethylbenzene, xylenes by EPA Method 8260B <br /> MTBE=Methyl tertiary butyl ether <br /> DIPE= Di-isopropyl ether, analyzed by EPA Method 82606 <br /> ETRE=Ethyl tertiary butyl ether analyzed by EPA Method 8260B <br /> TAME=Tertiary amyl methyl ether, analyzed by EPA Method 82606 <br /> TBA=Tertiary butyl alcohol, analyzed by EPA Method 8260B <br /> 1,2-DCA= 1,2-Dichloroethane, analyzed by EPA Method 8260B <br /> EDB=Ethylene D+bromide, analyzed by EPA Method 8260B <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 limit <br /> NA=Not applicable <br /> Notes <br /> a=Quantity of unknown hydrocarbon in sample based on gasoline <br /> b=The sample chromatographic pattern for TPH does not match the chromatographic pattern of the specified standard Quantitation of the unknown hydrocarbon(s) <br /> in the sample was based upon the specified standard <br /> c=Concentration is greater or equal to the Method Detection Limit but lower than the Reporting Limit <br /> Site surveyed June 4,2004 by Virgil Chavez Land Surveying of Vallejo, CA <br /> Page 3 <br />