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I <br /> I <br /> WELL CONCENTRATIONS <br /> !' Former Shelf Service Station ; <br /> 1160 West Yosemite Avenue <br /> F Manteca, CA <br /> MTBE Depth to GW <br /> Well ID Date TPPH B T E X 8260 DIPS ETBE TAME TBA 1,2-DCA EDB TOC Water Elevation <br /> u IL u IL u IL u IL u IL (ug/L u /L u IL u IL u IL u /L a /L MSLft MSL <br /> MWS 0311512005 <50 <0 50 1 <0 50 1 <0 50 <1 0 NA NA NA NA <5 0 1 <0 50 NA 28 71 16 68 12 43 <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 8260B <br /> BTEX= Benzene,toluene,ethylbenzene,xylenes by EPA Method 82608 <br /> MTBE=Methyl tertiary butyl ether <br /> DIPS=Di-isopropyl ether,analyzed by EPA Method 8260B <br /> ETBE=Ethyl tertiary butyl ether,analyzed by EPA Method 8260B <br /> TAME W Tertiary amyl methyl ether,analyzed by EPA Method 8260B <br /> TSA=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 8260B <br /> TQC=Top of Casing Elevation <br /> I GW=Groundwater <br /> ug/L=Parts per billion <br /> MSL=Mean sea level <br /> ft =Feet <br /> r <n=Below detection limit <br /> NA=Not applicable <br /> I <br /> Notes <br /> a=Quantity of unknown hydrocarbon in sample based on gasoline <br /> Site surveyed June 4,2004 by Virgil Chavez Land Surveying of Vallejo,CA <br /> Page 2 <br /> I I <br />