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WELL CONSTRATIONS <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 8264 DIPE ETBE TAME TBA Methanol Ethanol 1,2-DCA EDB TOC Water Elevation <br /> u IL u u IL u IL u ! u IL u IL u IL u IL <br /> IL (ug/L (u/L u IL (ug/L (ug/L MSL ft MSL <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by 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 tertiary butyl ether,analyzed by EPA Method 8260B <br /> TAME=Tertiary amyl methyl ether,analyzed by EPA Method 8260B <br /> TBA=Tertiary butyl alcohol or Tertiary butanol,analyzed by EPA Method 8260B <br /> 1,2-DCA=1,2-Dichloroethane, analyzed by EPA Method 8260B <br /> EDB= 1,2-Dibromoethane or Ethylene Dibromide,analyzed by EPA Method 8260B <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,CA <br /> Page 3 <br />