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WELL CONCENTRATIONS <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 8260 DIPE ETBE TAME TBA Methanol Ethanol 1,2-DCA EDB TOC Water Eierrataon <br /> (ug/L (WIL) (ug/L (ua) u IL (u/L (u_/L u !L fu/L)( (u/L (u/L IL (u/L (u/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 82606 <br /> MTBE=Methyl tertiary butyl ether <br /> DIPE=Di-isopropyl ether,analyzed by EPA Method 8260B <br /> ETBE=Ethyl terhary 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 W Parts per billion <br /> MSL=Mean sea level <br /> ft=Feet <br /> <n=Below detection limit <br /> NAW 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 /> c=Unable to gauge due to well being submerged in puddle <br /> Ethanol and Methanol analyzed by EPA Method 8260B <br /> i <br /> Site surveyed December 23,2002 by Virgil Chavez Land Surveying of Vallejo,CA <br /> Wells MW-6 through MW-9 surveyed January 12,2005 by Virgil Chavez Land Surveying of Vallejo,CA <br /> Pa e 4 <br />