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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 SPM DO <br /> Well ID Date TPPH TEPH B T E X 8020 8260 TOC Water Elevation Thickness Reading <br /> u L u L u L (Ug/Q. u L u IL u L u L MSL ft MSL ft m <br /> Abbreviations. <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82606,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 82608,prior to May 17,2001,analyzed by EPA Method 8020 <br /> MTBE= Methyl-terdary-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 /> uglL=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 a Result reported was generated out of hold time. <br /> b=Well not sampled due to lack of access agreement. <br /> Site surveyed(except MW-8)on February 20,2002,by Virgil Chavez Land Surveying of Vallejo, California <br /> Wells MW-8, MWA 1-82, MW-11-122, MW-16.80, MW-18-120,MW-18-84, and MW-19-120 surveyed September 20,2002, by Virgil Chavez <br /> Land Surveying of Vallejo, California. <br /> Page 31 <br />