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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> Stockton, CA <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 1L (ug/L.) (ug/L) ( <br /> ugIL (ug/L (ug/L ug/L MSL ft ft MSL ft ppm <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by EPA Method 82606, prior to May 11, 2001, analyzed by EPA Method 8015 <br /> TEPH =Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX= Benzene, toluene, ethylbenzene, xylenes by EPA Method 8260B, prior to May 11, 2001, analyzed by EPA Method 8020 <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 j <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 /> b=The TPPH values for these samples are primarily caused by the presence of chlorinated compounds <br /> c= Survey date <br /> d= Based on historical data, the samples for MW-6 and MW-7 appear to have been switched <br /> e=The reported value is primarily due to the presence of Tetrachloroethene <br /> f=Top of casing elevation altered during wellhead maintenance <br /> g = Hydrocarbons reported as TPPH do not exhibit a typical Gasoline chromatographic pattern <br /> Dissolved Oxygen readings given prior to well purging <br /> Site surveyed November 30, 2001, and September 20, 2002, by Virgil Chavez Land Surveying of Vallejo, California j <br /> Page 13 <br />