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WELL COANTRATIONS <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> Stockton, CA <br /> Wic #204-7525-0104 <br /> IATBE MTBEDepth 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 I u It_ u IL u IL u IL u !L u IL MSL ftft MSL ft m <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B, prior to May 11,2001, analyzed by EPA Method 8015 <br /> TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> STEX= Benzene, toluene,ethylbenzene,xylenes by EPA Method 82606, prior to May 11, 2001, analyzed by EPA Method 8020 <br /> MTBE=Methyl-terbary-butyl ether <br /> TOC=Top of Casing Elevation <br /> SPH =Separate-Prase Hydrocarbons <br /> GW=Groundwater <br /> DO=Dissolved Oxygen <br /> ug/L= Parts per billion <br /> ppm=Parts per million <br /> MSI.=Mean Sea Level <br /> It=Feet <br /> m= 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 /> Dissolved Oxygen readings given prior to well purging <br /> Site surveyed November 30, 2001,by Virgil Chavez Land Surveying of Vallejo, California <br /> Top-of-casing measurements prior to December 7,2001, are measured by Site Datum <br /> Page 11 <br />