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WELL CONCENTRATIONS <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 DIPS ETRE TAME EDB 1,2-DCA Ethanol Methanol TOC Water Elevation <br /> _J2911-) (ug/L (ug/Q' (ug/L (ug/L u IL u IL u IL (ug/L (ug/L u IL u IL (ug/L u IL u /L u IL <br /> _ML ft M5L <br /> S-6 1 8110/2004 1 NA NA I NA I NA I NA NA NA NA I NA NA NA NA NA NA NA NA 399 1521 1122 <br /> jAbbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608 pnor to January29 2001 analyzed by EPA Method 80`15 <br /> TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX=Benzene toluene ethylbenzene xylenes by EPA Method 8260B pnor to January 29 2001 analyzed by EPA Method 8020 <br /> MTBE=Methyl tertiary butyl ether <br /> DIPE=Di isopropyl ether analyzed by EPA Method 82606 <br /> ETRE=Ethyl tertiary butyl ether,analyzed by EPA Method 82608 <br /> TAME=Tertiary amyl methyl ether analyzed by EPA Method 82608 <br /> TBA=Tertiary butyl alcohol analyzed by EPA Method 82608 <br /> EDB=Ethylene dibromide analyzed by EPA Method 82608 <br /> 12 DCA=1 2-Dichloroethane analyzed by EPA Method 8260B <br /> TOC=Top of Casing Elevation <br /> SPH=Separate Phase Hydrocarbons <br /> GW=Groundwater <br /> ug/L=Parts per billion <br /> MSL=Mean sea level <br /> it =Feet <br /> <n=Below detection 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 6260B <br /> Site surveyed January 7 2002 by Virgil Chavez Land Surveying of Vallejo CA <br /> Page 6 <br />