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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> Stockton, CA <br /> Wic #204-7525-0104 <br /> MTBE MTBE Depth to Depth to GW SPH DO <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water SPH Elevation Thickness Reading <br /> (ug/L (ug/L u IL u IL (ug/L (ug/L u IL MSL ft ft MSL ft m <br /> VEW-2 05115/2000 112,000 3,050 13,000 2,200 20,500 <500 NA NA 3195 NA NA NA NA <br /> VEW-2 08/16/2000 73,400 3,200 9,770 1,900 17,900 <2,000 228 NA 3512 NA NA NA NA <br /> VEW-2 11/21/2000 68,200 2,530 8,350 1,950 14,600 <500 NA NA 3318 NA NA NA NA <br /> VEW-2 03/16/2001 84,200 7,480 12,600 1,680 19,300 <2,500 NA I NA 1 3172 NA NA NA NA <br /> VEW-2 0511112001 1 130,000 1 9,900 1 14,000 1 2,000 1 23,000 NA <500 NA 3173 NA NA NA NA <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by modified EPA Method 82606, 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, ethylbenzene,xylenes by EPA Method 82606, prior to May 11, 2001,analyzed by EPA Method 8020 <br /> MTBE= methyl-tertiary-butyl ether by EPA Method 8020 <br /> TOC=Top of Casing Elevation <br /> SPH= Separate-Phase Hydrocarbons <br /> GW= Groundwater <br /> DO= Dissolved Oxygen <br /> ug/t_=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 /> i= Chromatogram pattern indicates an unidentified hydrocarbon <br /> a =Analyzed outside of EPA recommended hold time <br /> Dissolved Oxygen readings given prior to well purging <br /> Page 9 <br />