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• WELL COPENTRATIONS <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 IL u IL u IL u IL u IL u IL u IL MSL ft ft MSL ft m <br /> Notes <br /> = Chromatogram pattern indicates an unidentified hydrocarbon <br /> a=Analyzed outside of EPA recommended hold time <br /> b=The TPP»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 = Hydrocarbon does not match pattern of laboratory's standard <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 <br /> Top-of-casing measurements prior to December 7, 2001, are measured to arbitrary Site Datum <br /> Page 15 <br />