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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way ' <br /> Stockton, CA <br /> Wic #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 /> (ug/L (ug/L (ug/L (u/L (u/L (u/L (u/L MSL ft MSL ft m <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline dy modified EPA Method 8260B, 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 /> Page 21 <br />