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WELL CONCENTRATIONS <br /> Former Shell Service Station <br /> i07i North Main Street <br /> Manteca, CA <br /> MTBE MTBE Depth to GW DO <br /> Well ID Date TPPH B T E X 8020 8250 DIPE ETRE TAME TBA 1,2-DCA EDB Methanol Ethanol TOC Water Elevation Reading <br /> u IL u IL u IL u IL u 6IL u IL u IL u IL u I- u IL u IL u IL u IL (.10L 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 /> i <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 butanol by EPA Method 82608 <br /> DIPS=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 <br /> 1,2-DCA=1,2-d3chloroethane by EPA Method 8010 or 8260B <br /> EDB=Ethylene dibromide or1,2-dibromosthane by EPA Method 8010 or 82608 <br /> TOC=Top of Casing Elevation y <br /> GW=Groundwater <br /> ug/L=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 /> 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 8260B <br /> TPPH and BTEX analyzed by EPA Method 8260B 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 /> i P 4 <br /> I <br />