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i <br /> WELL CONOINTRATIONS <br /> Shell-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton, CA <br /> MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness <br /> u IL (u/L u IL u IL u /L (ug/L (ug/L MSL ft MSL ft <br /> MW-3 11/14/2001 <50 <0 50 <0 50 <0 50 <0 50 NA 13 9893 3668 6225 NA <br /> MW-3 01/31/2002 <50 <0 50 <0 50 <0 50 <0 50 NA 95 12 31 a 3388 -2157 NA <br /> MW-3 05/16/2002 <50 <0 50 <0 50 <0 50 <0 50 NA 50 1231 3347 -21 16 NA <br /> MW-3 08108/2002 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 1 1231 1 3846 -2615 NA <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by EPA Method 8260B, prior to May 11, 2001,analyzed by EPA Method 6015 <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 <br /> TOC=Top of Casing Elevation <br /> SPH =Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> ug/L=Parts per billion <br /> MSL=Mean sea level <br /> ft=Feet <br /> <n= Below detection limit <br /> D=Duplicate sample <br /> NA=Not applicable <br /> I <br /> i <br /> Page 7 <br />