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WELL CONC�TRATIONS • <br /> Former Shell Service Station <br /> 1267 Country Club <br /> Stockton, CA <br /> MTBE MTBE Depth to GW <br /> Well ID Date TPPH TEPH B T E X 8020 8260 TBA DIPE ETBE TAME EDB 1,2-DCA Ethanol Methanol TQC Water Elevation <br /> (ug/L (ug/L (ug/L (ug/L (ug/1L u 1L u 1L ug/L)( u /L u /L u lL u IL u 1L u IL u /L u 1L MSL (ft MSL <br /> S-6 10811012004 NA NA NA NA NA NA NA I NA I NA NA I NA NA NA NA NA NA 3 99 15 21 -1122 <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608,prior to January 29,2001 analyzed by EPA Method 8015 <br /> TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX=Benzene toluene ethylbenzene xylenes by EPA Method 826013 prior to January 29 2001 analyzed by EPA Method 8020 <br /> MTBE=Methyl ternary butyl ether <br /> DIPE=Di-isopropyl ether,analyzed by EPA Method 8260B <br /> ETBE=Ethyl tertiary butyl ether,analyzed by EPA Method 82606 <br /> TAME=Tertiary amyl methyl ether,analyzed by EPA Method 82608 <br /> TBA=Tertiary butyl alcohol analyzed by EPA Method 82606 <br /> EDB=Ethylene dibromide,analyzed by EPA Method 8260B <br /> 1 2-DCA=1,2-Dichloroethane,analyzed by EPA Method 8260B <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> ug1L=Parts per billion <br /> MSL=Mean sea level <br /> ft =Feet <br /> <n=Below detecllon limit <br /> (D)=Duplicate sample <br /> NA=Not applicable <br /> ND=Not detected at or above the minimum quantitation limits <br /> Notes <br /> a=This sample was analyzed outside of EPA recommended hold time <br /> b=TEPH with Silica Gel cleanup <br /> c=Hydrocarbon reported does not match the pattern of the laboratory's standard <br /> d=Hydrocarbon reported is in the early diesel range and does not match the laboratory's diesel standard <br /> *MTBE by EPA method 8260 was run out of recommended hold time,value should be considered an estimate <br /> Ethanol analyzed by EPA Method 82608 <br /> Site surveyed January 7,2002 by Virgil Chavez Land Surveying of Vallejo,CA <br /> Page 6 <br />