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WELL CONONTRATIONS <br /> Shell-branded Service Station <br /> 4315 Waterloo Road - <br /> Stockton, CA <br /> MTBE MTBE Depth to GW <br /> Well ID Date TPPH B T E X 8020 8260 DIPE ETBE TAME TBA 1,2-DCA EDB Ethanol TQC Water Elevation <br /> u /L u /L u /L uIL u !L u1L u1L u /L u /L uIL u /L uIL uIL u1L MSL ft MSL <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by EPA Method 82603, pnor to July 23,2001, analyzed by EPA Method 8015 <br /> TEPH =Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> 8TEX=Benzene,toluene, ethylbenzene,xylenes by EPA Method 82606, prior to July 23,2001, analyzed by EPA Method 8020 <br /> MTBE =Methyl tertiary butyl ether <br /> 1,2 DCA= 1,2-D:chloroethane <br /> EDB= 1,2-Dibromoethane <br /> DIPE=Di-isopropyl ether <br /> ETBE=Ethyl tertiary butyl ether <br /> TAME=Tertiary amyl methyl ether <br /> TBA=Tertiary butyl alcohol or Tertiary butanol <br /> TOC =Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocarbons <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 /> Site surveyed December 20, 2001 by Virgil Chavez Land Surveying of Vallejo, CA <br /> Page 4 <br />