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WELL CONCENTRATIONS <br /> Former Shell Service Station <br /> 1071 North Main Street <br /> Manteca, CA <br /> MTBE MTBE Depth to GW DO <br /> Well ID Date TPPH 8 T E X 8020 8260 �DIPE ETBE TAME TBA 1,2-DCA EDB Methanol Ethanol TOC Water Elevation Reading <br /> u IL u u 1(U/L u `IL u /L (ug/L (ug/L (ug/L u IL (ug/L (ug/L (ug/L u IL u IL MSL ft M5L m <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B,pnor to July 11,2001,analyzed by EPA Method 8015,except where noted ` <br /> BTEX=Benzene,toluene,ethylbenzene,xylenes by EPA Method 82608,prior 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 butanal by EPA Method 82608 <br /> DIPE=Di-isopropyl ether by EPA Method 8260B <br /> ETBE= Ethyl tertiary butyl ether by EPA Method 8260B <br /> TAME=Tertiary amyl methyl ether by EPA Method 8260E = t <br /> 1,2-DCA=1,2-dichloroethane by EPA Method 8010 or 8260B r <br /> EDB=Ethylene dibromrde or1,2-dibromoethane by EPA Method 8010 or 8260B <br /> TOC=Top of Casing Elevabon i <br /> GW=Groundwater <br /> ug/L=Parts per billion <br /> ppm=Parts per million <br /> MSL=Mean sea level _ <br /> ft =Feet <br /> <n w Below detection lima <br /> (D)=Duplicate sample I <br /> Notes _ <br /> a=Sample reanalyzed past hold time,results should be considered estimates <br /> b=Hydrocarbon does not match pattern of laboratory's standard <br /> Ethanol and Methanol analyzed by EPA Method 82608 ! <br /> TPPH and BTEX 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 /> Page 4 <br />