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WELL CONCENTRATIONS <br /> Shell-brander!Service Station <br /> 6131 Pacific Avenue <br /> Stockton, CA <br /> MTBE MTBE Depth to GW SPH <br /> Fell Date TPPH B T E X 8020 8260 DWE ETBE TAME TBA Ethanol Methanol 1,2-DCA EDB TOC Water Elevation Thickness <br /> u !L u IL u /L u !L u /L u IL u IL u 1L u IL u /L u IL u /L u IL u IL u IL MSL ft MSL ft <br /> Notes <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 i-pnmanly 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 /> h=Sample contains discrete peak in gasoline range <br /> '=Chromatogram pattern indicates an unidentified hydrocarbon <br /> Ethanol and Methanol analyzed by EPA Method 82606 <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 /> Top-of-casing measurements prior to December 7,2001 are measured to arbitrary Site Datum <br /> Wells MW-12 and MW 3 surveyed March 5,2004 by Virgil Chavez Land Surveying of Vallejo CA <br /> Page 14 <br />