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i <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, CA <br /> �Wlc #204-7524-4305 <br /> MTBE MTBEDepth to GW SPH DO <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness Reading <br /> u /L (ug/L (Ug/L (ug/L (ug/L (ug/L (u/L MSL ft MSL ft m <br /> If 11 i <br /> MW-10 5/17101 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 88 19e 1815 7004 NA 1 512 1 <br /> MW-10 8116101 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 8819 1950 6869 NA 24/16 <br /> MW-10 1216101 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 8819 2039 6780 NA 21/23 <br /> MW-10 2/14102 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 7 41 If 1877 -11136 NA 18/21 <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 82606,prior to November 21,2000, analyzed by EPA Method 80i 5,except where noted <br /> BTEX=Benzene,toluene,ethylbenzene,xylenes by EPA Method 82608, 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 1 <br /> n/n=Pre-purge/Post-purge <br /> . P&20 <br />