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WELL CON TRATIONS <br /> Shell-branded Service Station <br /> 4315 Waterloo Road <br /> Stockton, California <br /> MTBE MTBE Depth to Depth to GW SPH DO <br /> Well ID Date TPPH TEPHB T E X 8020 8260 TOC Water SPH Elevation Thickness Reading <br /> (ug/L) (ug/L) (uglL) (uglL) (ug/L) (ug/L) (ug/L) (uglL) (MSL) (ft)} (ft)} (MSL) (ft ) (ppm) <br /> MWA 10/27/1999 758 NA <0 500 <0 500 <0 500 <0 500 221 211 NA 5937 NA NA NA NA <br /> MW-1 01/06/2000 <50 0 NA <0 500 <0 500 <0 500 <0 500 168 172 NA 5811 NA NA NA NA <br /> MWA 04/18/2000 <50 0 NA <0 500 <0 500 <0 500 <0 500 150 168 NA 4995 NA NA NA NA <br /> MWA 07/2712000 <50 0 NA <0 500 <0 500 <0 500 <0 500 452 441 NA 5680 NA NA NA NA <br /> MW-1 10/19/2000 <50 0 NA <0 500 <0 500 <0 500 <0 500 611 659 NA 5967 NA NA NA NA <br /> MWA 01/16/2001 532 NA <0 500 <0 500 <0 500 131 151 136 NA 5840 NA NA NA NA <br /> MWA 04/12/2001 <50 0 NA <0 500 <0 500 <0 500 <0 500 189 164 NA 5720 NA NA NA NA <br /> MW-1 07/2312001 <50 NA <0 50 <0 50 <0 50 <0 50 NA 97 NA 6204 NA NA NA NA <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82606, prior to July 23,2001,analyzed by EPA Method 8015 <br /> TEPH =Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX=benzene,toluene,ethylbenzene,xylenes by EPA Method 8260B, prior to July 23,2001,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 /> 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 /> NA=Not applicable <br /> Page 1 <br />