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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 /> WelIID Date TPPH B T E X 8a2a 82Sa DIPE ETBE TAME TBA 1,2-DCA EDB Methanol Ethanol TOC Water Elevation Reading <br /> u 11_ u !L u !L u IL u IL u 1L u IL u L u L u IL u Ljug/L)--I- <br /> well <br /> u IL u L (ug/L (ug/L MSL ft MSI 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 /> DIPE=DAsopropyl ether by EPA Method 82608 <br /> ETBE= Ethyl ternary butyl ether by EPA Method 8260B <br /> TAME=Tertiary amyl methyl ether by EPA Method 62608 <br /> TBA=Tertiary butyl alcohol or Tertiary butanol by EPA Method 82608 ' <br /> 1,24DCA=1,2ihchloroethane by EPA Method 8010 or 82608 <br /> EDS=Ethylene drbromde art,2-dibromoethane by EPA Method 8010 or 82608 _ <br /> TOC=Top of Casing Elevation <br /> DO=Dissolved Oxygen <br /> GW=Groundwater s <br /> ug1L=Parts 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 /> . a <br /> Notes <br /> a=Sample reanalyzed past hold We,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 IN Analytical <br /> Site surveyed May 7,2002 by Virgil Chavez Land Surveying of Vallejo,CA <br /> i <br /> Page 4 <br />