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• WELL CENTRATIONS ' <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> Stockton,CA <br /> TB MTB Depth to SPH <br /> KEel Date TPPH B T E X 8020 8260 DIPE ETBE TAME TBA Ethanol Methanol 1,2-DCA EDB TOC Water Elevation Thickness <br /> u /L u1L u1L u1L u /L u /L uIL u /L u !L u1L uIL u /L u /L u /L u /L MSL R MSL ft <br /> Notes <br /> "=Chromatogram pattern indicates an unidentified hydrocarbon <br /> a=Analyzed outside of EPA recommended hold time <br /> b=The TPPH values far 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 CA <br /> Tap-of-casing measurements prior to December 7 2001 are measured to arbitrary Site Datum <br /> Wells MVV-12 and MW 13 surveyed March 5 2004 by Virgil Chavez Land Surveying of Vallejo CA <br /> I <br /> I <br /> Page 12 <br />