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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, CA <br /> iWic #204-7524-4305 <br /> MTBE MTBE Depth to GW SPH DO <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness Reading <br /> u IL u IL u IL u IL u IL u IL a IL MSL ft MSL ft m <br /> MW-10 05117/2001 <50 <0 50 <0 50 <0 50 ][ <0 50 NA <5 0 88 19e 1815 70'04 NA 1 512 1 <br /> MW-10 08/16/2001 <50 <0 50 <0 50 <0 50 ][ <0 50 NA <5 0 8819 1950 68169 NA 24116 <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by modified EPA Method 82606,prior to November 21,2000 analyzed by EPA Method 8015,lexcept where noted <br /> BTEX= benzene,toluene, ethylbenzene,xylenes by EPA Method 826013, pnor to November 21,2000,analyzed by EPA Method 8020 except where Hated <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 /> ms] = 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 /> Page 20 s <br /> 0 0 s <br />