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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, CA <br /> MTBE MTBE Depth to GW SPH Lg <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness R <br /> u /L (u21L) u IL u /L u IL u /L u & MSL ft MSL ft <br /> MW-10 02/1412002 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 7 41 f 1877 -1136 NA 18/21 <br /> MW-10 05/3112002 Well inaccessible NA NA NA NA NA 741 NA NA NA NA <br /> MW-10 08/2312002 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 741 2022 -1281 NA NA <br /> MW-10 11/13/2002 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 741 2102 -1361 NA NA <br /> MW-10 02/11/2003 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 741 1987 -1246 NA NA <br /> MWA Of 05/29/2003 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 7 41 1948 -12 07 NA NA <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82606, prior to November 21,2000,analyzed by EPA Method 8015,except where noted <br /> BTEX=Benzene,toluene, ethylbenzene,xylenes by EPA Method 8260B,prior to November 21,2000,analyzed by EPA Method 8020,except where noted <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 /> ug1L=Parts per billion <br /> ppm=Parts per million <br /> MSL=Mean sea level <br /> ft=Feet <br /> <n=Below detection limit <br /> D=Duplicate sample <br /> NA=Not applicable <br /> n/n=Pre-purge/Post-purge <br /> Page 21 <br />