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WELL CONCENTRATIONS <br /> Former Shell Service Station <br /> 1160 West Yosemite Avenue <br /> Manteca, CA <br /> X TBE Lu u IL Depth to <br /> Well Date TPPH B T E 8260 D1 1. IPE ETBE TAME GW <br /> u IL a L u IL u IL uM , Water <br /> Elevation Iu (' u IL u IL MSL ft MSL <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 8260B <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 8260B <br /> ETBE=Ethyl ternary butyl ether,analyzed by EPA Method 82608 <br /> TAME=Tertiary amyl methyl ether,analyzed by EPA Method 82608 <br /> TBA=Tertiary butyl alcohol, analyzed by EPA Method 8260B <br /> 1,2-DCA= 1,2-Drchloroethane,analyzed by EPA Method 82606 <br /> EDB=Ethylene Dibromide,analyzed by EPA Method 82606 <br /> i <br /> TOC=Top of Casing Elevation <br /> GW=Groundwater <br /> ug/L=Parts per billion <br /> MSL=Mean sea level <br /> It =Feet <br /> <n=Below detection limit <br /> NA=Not applicable <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 3 <br /> I <br />