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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 624 West Charter Way <br /> Stockton,CA <br /> MTBE MTBE Depth to GW 5PH DO <br /> Well ID Date TPPH B T E X 8020 8260 DIPE ETRE TAME TBA 1,2-DCA EDB Ethanol[Methanol TQC Water Elevation Thickness Reading <br /> u L u (u2!g u u IL u (ug&) u L u !L u u L u L u L u IL MSL ft MSL ft m <br /> MW-10 02106/2006 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 741 1921 -1180 NA NA <br /> MW-10 05/08/2006 X50 -CO 50 <10_ 1 <1 0 [_<10 NA c7 0 <20 <20 <20 <10 NA NA NA NA 7 41 1672 -9 31 NA NA <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B pnor to November 21,2000 analyzed by EPA Method 8015 except where noted <br /> BTEX=Benzene toluene,elhylbenzene,xylenes by EPA Method 82608 prior to November 21,2000,analyzed by EPA Method 8020 except where noted <br /> MTBE Melhyl tertiary butyt ether <br /> DIPE=1314sopropyl ether analyzed by EPA Method 8260B <br /> r <br /> ETRE=Ethyl tertiary butyl ether analyzed by EPA Method 82608 ✓c� <br /> TAME =Tertiary amyl methyl ether anaryzed by EPA Method 826DB O-� <br /> Olt <br /> TBA=Tertiary butyl alcohol or tertiary butanol analyzed by EPA Method 82608 <br /> 1 2-DCA=1 2 Dichioroethane analyzed by EPA Method 82608 <br /> EDS=Ethylene dibromide,analyzed by EPA Method 82608 <br /> TOC=Top at Casing Elevation <br /> SPH=Separate Phase Hydrocarbons <br /> GW=Groundwater <br /> DO a Dissolved Oxygen <br /> uglL=Parts per billion <br /> ppm=Parts per million <br /> MSL=Mean sea level <br /> it =Feet <br /> <n=Below detection limit <br /> (D)=Duplicate sample <br /> NA=Not applicable <br /> nln=Pre-purge/Post purge <br /> Page 19 <br />