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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 DO <br /> Well ID Date TPPH TEPH B T E x 8020 8260 TOC Water Elevation Thickness Reading <br /> _1u 91L u IL u /LL u IuW1L (ug/L) LqILj u IL SL Mft MSL ft m <br /> aF <br /> Abbreviations J <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 826013, pnor 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 8267B,p 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 /> 00=Dissolved Oxygen <br /> ppm=Parts per million <br /> ug1L=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 Ii ` <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 /> I <br /> I, <br /> I <br /> Page 32 <br />