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WELL CONCENTRATIONS <br /> Former Texaco Service Station <br /> 440 W. Charter Way <br /> Stockton, CA <br /> MTBE MTBE Depth to GW SPH O <br /> Well ID Date TPPH TEPH B T E X 8020 8260 TOC Water Elevation Thickness:R:ead]ingu /L u /L u /L u /L u /L u /L u /L MSLMSL ft. <br /> Abbreviations: <br /> TPPH =Total petroleum hydrocarbons as gasoline by EPA Method 8260B; prior to May 17,2001,analyzed by EPA Method 8015. <br /> TEPH =Total petroleum hydrocarbons as diesel by modified EPA Method 8015. <br /> BTEX= Benzene,toluene,ethylbenzene, xylenes by EPA Method 8260B; prior to May 17,2001,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 /> ppm=Parts per million <br /> ug/L=Parts per billion <br /> MSL=Mean sea level <br /> ft=Feet <br /> <n=Below detection limit <br /> NA=Not applicable <br /> ND=Not detected at or above the minimum quantitation limit. <br /> Notes: <br /> a=Result reported was generated out of hold time. <br /> b=Well not sampled due to lack of access agreement. <br /> c=Hydrocarbon does not match pattern of laboratory's standard. <br /> Site surveyed(except MW-8)on February 20, 2002, by Virgil Chavez Land Surveying of Vallejo, California. <br /> Wells MW-8, MW-11-82, MW-11-122, MW-18-80, MW-18-120, MW-19-81,and MW-19-120 surveyed September 20,2002, by Virgil Chavez <br /> Land Surveying of Vallejo, California. <br /> Page 32 <br />