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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 TQC Water Elevation � <br /> u IL) (u IL) ((ug/L} (ug/L u IL) (u IL) (u /L) (u IL) (u/L (u /L} (u IL) u IL) (MSL) ft (MSL) <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 82608 <br /> BTEX=Benzene,toluene,ethylbenzene xylenes by EPA Method 82606 <br /> MTBE=Methyl tertiary butyl ether <br /> DIPE=Di-isopropyl ether,analyzed by EPA Method 8260B <br /> ETBE=Ethyl tertiary butyl ether,analyzed by EPA Method 8260B <br /> TAME=Tertiary amyl methyl ether, analyzed by EPA Method 8260B <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 Dibromide, analyzed by EPA Method 8260E <br /> TOC=Top of Casing Elevation <br /> OW=Groundwater <br /> ug/L 4 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 />