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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 1267 Country Club <br /> Stockton,CA <br /> I MTBE MTBE € Depth to I GW <br /> [Well ID Date TPPH TEPH B T E X 8020 8260 TBA DIPE ETBE TAME 1 EDB 11.2-DCA Ethanol € Methanol TOC Water Elevation <br /> u 1L u 1L OWL) u u IL u 1L u 1L u 1L u 1L a /L a 1L ! u L I u IL u /L u /L I MSL I ( MSL <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B pnor 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 B260B prior to January 29 2001 analyzed by EPA Method 8020 <br /> MTBE=Methyl tertiary butyl ether <br /> TBA=Tertiary butyl alcohol or tertiary butand <br /> DIPE=Di-isopropyl ether <br /> ETBE=Ethyl tertiary butyl ether <br /> TAME=Tertiary amyl methyl ether <br /> EDB=Ethylene dibromide <br /> 1 2 DCA=1 2 Dichloroethane <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 /> A=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 /> MTBE by EPA method 8260 was run out of recommended hold time value should be considered an estimate <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 laboratorys standard <br /> Site surveyed January 7 2002 by Virgil Chavez Land Surveying of Vallejo California <br /> Page 6 <br /> I <br />