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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> '[071 North Main Street <br /> Manteca, CA <br /> MTBE MTBE Depth to GW D O <br /> Well ID Date TPPH B T E X 8020 8260 D1PE ETBE TAME TBA 1,2-DCA EDB Methanol Ethanol TOC Water Elevation Reading <br /> u !L u IL u !L u IL u IL u !L u IL u /L u IL u IL u IL u !L u 1L u IL u IL MSL ft MSL m <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B,prior to July 11,2001,analyzed by EPA Method 8015,except where noted <br /> BTEX=Benzene,toluene,ethylbenzene xylenes by EPA Method 82608,pnor to July 11,2001 analyzed by EPA Method 8020,except where noted <br /> MTBE=Methyl tertiary butyl ether <br /> TBA=Tertiary butyl alcohol or Tertiary butanol by EPA Method 82608 <br /> DIPE=Di-isopropyl ether by EPA Method 8260B <br /> ETRE= Ethyl tertiary butyl ether by EPA Method 6260B <br /> TAME=Tertiary amyl methyl ether by EPA Method 8260B <br /> 1,2-DCA=1,2-dichloroethane by EPA Method 8010 or 8260E <br /> EDB=Ethylene dibromide orl,2-dibromoelhane by EPA1Method 8010 or 82608 <br /> TOC=Top of Casing Elevation <br /> GW=Groundwater <br /> ug/L=farts per billion <br /> ppm=Parts per million <br /> MSL=Mean sea level <br /> ft =Feet <br /> <n=Below detection limit <br /> (D)=Duplicate sample - <br /> Notes <br /> a=Sample re-analyzed past hold time,results should be considered estimates <br /> b=Hydrocarbon does no#match pattern of laboratory's standard <br /> TPPH and BTF_X analyzed by EPA Method 82608 on January 23,2001 <br /> For the April 26,2001 event,Sequoia's couner mistakenly took samples which were intended for Kiff Analytical <br /> Site surveyed May 7,2002 by Virgil Chavez Land Surveying of Vallejo,CA <br /> P 4 i <br />