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! • <br /> WELL CONCENTRATIONS - <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> Stockton, CA <br /> MTBE MBE Dept i to Dept1h to PH DO <br /> V <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water SPH Elevation Thickness Reading <br /> u /L u IL u IL u h- u 11 u L u /L MSL ft ft 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 /> BTEX= Benzene,toluene,ethyfbenzene,xylenes by EPA Method 82606, 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 <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 <br /> Page 13 <br />