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WELL CON IRNTRATIONS <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 /L u /L u /L u /L u /L MSL ftMSL ft <br /> MW-3 01131/2002 <50 <0 50 <0 50 <0 50 <0 50 NA 95 12 31 a 3388 -2157 NA <br /> MW-3 05116/2002 <50 <0 50 <0 50 <0 50 <0 50 NA 50 1231 3347 -2116 NA <br /> MW-3 08/08/2002 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 1231 3846 -2615 NA <br /> MW-3 10/30/2002 <50 <0 50 1 <0 50 <0 50 1 <0 50 1 NA <5 0 1 1231 1 3965 1 -2734 NA <br /> MW-3 02/21/2003 <50 050 <0 50 <0 50 1 1 NA <5 0 1231 3561 -2330 NA <br /> MW-3 04124/2003 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 12 31 3474 -2243 NA <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B,prior to May 11,2001, analyzed by EPA Method 8015 <br /> BTEX=Benzene,toluene,ethylbenzene,xylenes by EPA Method 8260B, 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/t_=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 /> Page 7 <br />