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WELL CONCENTRATIONS <br /> Former Shell Service Station <br /> 1267 Country Club <br /> Stockton, CA <br /> ,MTBE MTBE 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 1L (ug/L (ug/L (u/L (ug/L u IL u !L u1L (ug/L (ug/L u !L u IL u /L u /L)( (Ug/lL (ug/L MSL ftMSL <br /> S-6 05/14/2003 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 399 1348 949 <br /> S-6 08/1412003 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 399 1478 -1079 <br /> S-6 11/26/2003 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 399 1569 -1170 <br /> S-6 02!2312004 <10000 <50 b <100 <100 <100 <200 NA NA NA NA NA NA NA <100 NA NA 399 1449 1050 <br /> S-6 05!2112004 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 399 1392 1 -9 93 <br /> S-6 08!10!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 399 1576 -1177 <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method B260B 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 /> MTBE=Methyl tertiary butyl ether <br /> RIPE=De-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 8260B <br /> TBA=Tertiary butyl alcohol analyzed by EPA Method 82606 <br /> EDB=Ethylene dibromide analyzed by EPA Method 82608 <br /> 1 2-DCA=1,2 Dichloroethane,analyzed by EPA Method 82606 <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 />