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WELL CONCENTRATIONS <br /> Former Shell Service Station <br /> 1267 Country Club <br /> Stockton,CA <br /> MTBE MTBE Depth toGW <br /> Well ID Date TPPH TEPH B T E X 8020 8280 TSA p1PE ETRE TAME EDS 1,2-DCA Ethanal Methanol TOC Water Elevation <br /> {u !L u 1L) (u IL u 1L (u 1L u !L (u IL u IL u !L (u IL (u IL) (u IL) NIL) (u 1L u !L) u IL MSL ft (MSL) <br /> S6 05114!2003 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 399 1340 949 <br /> S6 00114/2003 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 399 1478 -1079 <br /> S6 11/26/2003 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 399 1569 1170 <br /> S6 02123/2004 <10000 <50 b <100 <100 <100 <200 NA NA NA NA NA NA NA <100 NA NA 399 1449 1050 <br /> 86 05121/2004 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 399 1392 1 -993 <br /> S6 08110/2004 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 399 1521 -1122 <br /> S-6 11/24/2004 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 3 99 1576 -11 77 <br /> S6 02/2512005 <50 <50 b <0 50 <0 50 <0 50 <1 0 NA NA NA NA NA NA NA <0 50 NA NA 399 1393 -994 <br /> S-6 0512012005 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 399 1250 a 51 <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260E 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 82606 prior to January 29,2001,analyzed by EPA Method 8020 <br /> MTBE=Methyl tertiary butyl ether <br /> RIPE=Di-isopropyl ether analyzed by EPA Method 82608 <br /> ETBE=Ethyl tertiary butyl ether analyzed by EPA Method 82608 <br /> TAME=Tertiary amyt 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 82606 <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 /> ug1L=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 /> I <br /> Page 6 <br />