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WELL CONSTRATIONS <br /> Shell-branded Service Station <br /> 4315 Waterloo Road l <br /> Stockton, CA <br /> MTBE MTBE Depth to GW <br /> Well ID Date TPPH B T E X 8020 8260 DIPE ETBE T7AMETBA 1,2-DCA EDB Ethanol TOC Water Elevation <br /> (u /L u /L) (u /L) {u IL} (u IL) (u IL} (u IL) (u IL} (u IL) ( (u IL (u IL) (u IL <br /> (u IL MSL (ft ) (MSL) <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B, prior to July 23, 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 July 23,2001,analyzed by EPA Method 8020 <br /> MTBE=Methyl tertiary butyl ether <br /> DIPS= Di-isopropyl ether,analyzed by EPA Method 82608 <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 or Tertiary butanol,analyzed by EPA Method 8260E <br /> 1,2 DCA= 1,2-Dichloroethane,analyzed by EPA Method 82608 <br /> EDB= 1,2-Dibromoethane,analyzed by EPA Method 8260B <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hycrocarbons <br /> GW=Groundwater <br /> DO= Dissolved Oxygen <br /> ug/L= Parts per billion <br /> ppm= Parts per million <br /> MSL=Mean sea level <br /> ft = Feet <br /> <n=Below detection limit <br /> NA=Not applicable <br /> Notes <br /> a=TOC elevation altered during wellhead maintenance <br /> b=Hydrocarbon does not match pattern of laboratory's standard <br /> Ethanol analyzed by EPA Method 8260B <br /> Site surveyed December 20,2001 by Virgil Chavez Land Surveying of Vallejo, CA <br /> Page 4 <br />