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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 2494 Fremont Street <br /> Stockton, CA <br /> MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness <br /> u IL u L (un/L fu/L)( (U/L u /L (u/L MSS ft I MSL ft <br /> if I <br /> S-4 02/18/2002 <50 <0 50 <0 50 <0 50 <0 50 NA <0 50 2229 5110 -2881 NA <br /> S-4 05/01/2002 110 21 23 062 67 NA <0 50 2229 5074 -2845 NA <br /> S-4 08/08/2002 62 43 055 <0 50 22 NA 48 2229 5358 -3129 NA <br /> S-4 10/28/2002 71 <0 50 <0 50 <0 50 <0 50 NA 057 2229 5568 -3339 NA <br /> 8-4 1 01/06120031 51 1 <0 50 1 <0 50 1 <0 50 1 <0 50 NA =5 0 22= 5461 -3232 NA <br /> 5-483 12131/2002 NA NA NA NA NA NA NA 2243 54.92 -3249 NA <br /> S-4-83 01/06/2003 240 <0 50 <0 50 18 31 NA <5 0 2243 5426 -3183 NA <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by EPA Method 82606, pnor to May 14,2001,analyzed by EPA Method 8015,except where noted <br /> BTEX= Benzene,toluene, ethylbenzene,xylenes by EPA Method 82606, pnor to May 14, 2001, analyzed by EPA Method 8020, except where noted <br /> MTBE=Methyl-terbary-butyl ether <br /> TOC=Top of Casing Elevation <br /> SPH= Separate-Phase Hydrocarbons <br /> GW = Groundwater <br /> ug/L=Parts per billion <br /> MSL= Mean sea level <br /> ft=Feet <br /> <n=Selow detection limit <br /> NA= Not applicable <br /> I <br /> I <br /> P 4 <br />