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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> R <br /> 620 West Charter Way <br /> Stockton, CA <br /> MTBE MTBE Depth to GW SPH DO <br /> 11 <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness Reading <br /> u IL uIL u IL u IL u 1L Ll IL MSL ft MSL ft m <br /> If it <br /> MW-10 12/0612001 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 8819 2039 6780 NA 21/23 <br /> MW-10 02/14/2002 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 741 f 1877 -1136 NA 1'8/2 1 <br /> MW-10 05/31/2002 Well inaccessible NA NA NA NA NA 741 NA �NA NA NA <br /> MWA 0 1 08/2312002 1 <50 I <0 50 1 <050 1 <0 50 <0 50 NA <5 0 741 2022 -1281 NA NA <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608I, prior to November 21, 2000,analyzed by EPA Method 8015, except where noted <br /> BTEX= Benzene,toluene,ethylbenzene,xylenes by EPA Method 8260B, prior to November 21, 2000,analyzed by EPA Method 8020,except where noted <br /> MTBE= Methyl-tertiary-butyl ether <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 /> D = Duplicate sample <br /> NA=Not applicable <br /> nln= Pre-purge/Post-purge <br /> I <br /> I <br /> i <br /> P 20 <br />