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WELL CONCENTRATIONS <br /> Former Shell Service Station <br /> 1267 Country Club <br /> Stockton, CA <br /> MTBE MTBE I I 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 TOC Water Elevation <br /> (u 21L u 1L u IL u !L u !L u L u IL u IL u IL u L u IL u 1L) u !L (u !L u !L u L MSL ft MSL <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B 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 8260B,prior to January 29 2001,analyzed by EPA Method 8020 <br /> MTSE=Methyl tertiary butyl ether <br /> DIPE=Di isopropyl ether,analyzed by EPA Method 8260B <br /> ETBE=Ethyl tertiary butyl ether analyzed by EPA Method 82608 <br /> TAME=Tertiary amyl methyl ether,analyzed by EPA Method 82808 <br /> TBA=Tertiary butyl alcohol,analyzed by EPA Method 8260B <br /> EDB=Ethylene dibromide analyzed by EPA Method 82608 <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 /> uglL=Parts per billion <br /> MSL=Mean sea level <br /> ft =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 /> I <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 reflects)individual or discrete unidentified peaks not matching a typical fuel pattern <br /> f=Sample was reanalyzed past hold time with surrogate recovenes wwthin control limits and results of X50 ug& <br /> g=Phthalate peaks were found in the sample which are not believed to be related to the client sample If they were eliminated from the DRO analysis the concentration would be 36 uglL <br /> =MTBE by EPA method 8280 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 />