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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 6931 Pacific Avenue <br /> Stockton, CA <br /> Wic #204-7525-0104 <br /> MTBE MTBE Depth to Depth to GW SPH DO <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water SPH Elevation Thickness Reading <br /> u l1_(jj/L) u !L u IL (ug/L (u L (ug/L MSL ft ft MSL ft ( m <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 <br /> TEPH =Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX= benzene,toluene, ethylbenzene,xylenes by EPA Method 8020 <br /> MTBE= methyl-tertiary-butyl ether by E=PA Method 8020 <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 /> I <br /> ppm= parts per million <br /> msl= Mean sea level <br /> ft= Feet <br /> <n= Below detection limit <br /> NA= Not Applicable <br /> Notes <br /> *= Chromatogram pattern indicates an unidentified hydrocarbon <br /> a=Analyzed outside of EPA recommended hold time <br /> Dissolved Oxygen readings given prior to well purging <br /> I <br /> E <br /> I <br /> I <br /> Page 9 <br />