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WELL CONCENTRATIONS <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 /> (ug/L (ug/L (ug/L (u2/L) (ug/L (ug/L u IL MSL ftMSL ft <br /> MW-3 08/30/2001 <50 054 14 052 38 NA 20 9893 3779 6114 NA <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 -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 <0 50 <0 50 <0 50 NA <5 0 1231 3965 -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 04/24/2003 <50 <0 50 1 <0 50 1 <0 50 1 <0 50 NA <5 Q 1 1231 1 3474 1 -2243 1 NA <br /> MW-3 08/1412003 <50 <0 50 1 <0 50 1 <0 50 <1 0 NA 19 1231 4061 -2830 NA <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608,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 /> SPM=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 /> Page 7 <br />