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• • <br /> 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 8 T E X 8020 8260 TBA DIPE ETRE TAME EDB 1,2-DCA Ethanol Methanol TOC Water Elevation <br /> u IL (ug/L (ug/L (ug/L (ug/L u IL u IL u IL u IL u 1L (ug/L (ug/L (ug/L (ug/L u 1L u IL MSL flMSL <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 62608 pnor to January29 2001 analyzed by EPA Method 8020 <br /> MTBE=Methyl tertiary butyl ether <br /> RIPE=Di-isopropyl ether,analyzed by EPA Method 82606 <br /> ETBE=Ethyl tertiary butyl ether,analyzed by EPA Method 8260B <br /> TAME=Tertiary amyl methyl ether,analyzed by EPA Method 8260B <br /> TBA Tertiary butyl alcohol,analyzed by EPA Method 8260B <br /> EDB=Ethylene dibromide analyzed by EPA Method 8260E <br /> 1 2 DCA=1,2-Dichloroethane analyzed by EPA Method 82608 <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 /> m=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 /> e=The concentration reported reftect(s)individual or discrete unidentified peaks not matching a typical fuel pattern <br /> f=Hydrocarbon reported does not match the pattern of our 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 8260B <br /> Site surveyed January 7 2002 by Virgil Chavez Land Surveying of Vallejo CA <br /> Page 7 <br />