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0 <br /> WELL CONCENTRATIONS <br /> Shelf-branded Service Station <br /> 620 West Charter Way <br /> Stockton, CA <br /> Wic #204-7524-4305 <br /> MTBE MTBE Depth to GW SPH DO <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness Reading <br /> (ug/L- <br /> IL u IL u IL u IL u IL u IL u IL MSL ft. (MSL) ft. m <br /> MW-10 05/25/1999 <50.0 <0.500 <0.500 <0.500 <0.500 <5.00 NA 88.37 18.02 70.35 NA 1.9 <br /> MW-10 08/18/1999 <50.0 <0.500 <0.500 <0.500 <0.500 <5.00 NA 88.37 18.43 69.94 NA 1.4 <br /> MW-10 11/05/1999 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 NA 88.37 18.96 69.41 NA 1.211.4 <br /> MW-10 02/22/2000 <50.0 <0.500 <0.500 <0.500 <0.500 <5.00 NA 88.37 18.17 70.20 NA 0.611.6 <br /> MW-10 05/16/2000 <50.0 <0.500 1 <0.500 <0.500 <0.500 <2.50 NA 1 88.37 17.15 71.22 NA 0.810.6 <br /> MW-10 08/30/2000 <50.0 <0.500 <0.500 <0.500 <0.500 4.89 NA 88.37 18.27 70.10 NA 1.110.8 <br /> MW-10c 11/21/2000 <50 <0.50 <0.50 <0.50 <0.50 NA <5.0 88.37 18.96 69.41 NA 2.512.1 <br /> MWA 02/15/2001 71.8 X0.500 <0.500 0.977 3.49 <2.50 NA 88.37 18.95 69.42 NA 1.613.8 <br /> Abbreviations: <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 <br /> STEX=benzene,toluene,ethylbenzene,xylenes 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 /> DO= Dissolved Oxygen <br /> ug/L=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 /> nln= Pre-purge/Post-purge <br /> Page 19 <br />