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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 341 East Main Street <br /> Ripon, CA <br /> Wic #204-6522-0307 <br /> Depth <br /> MTBE MTBE to Depth GW SPH DO <br /> Well ID Date TPPH TEPH B T E X 8020 8260 TOC Water to SPH Elevation Thickness Reading <br /> u /L u /L u IL u IL u /L u /L (ug/ u /L MSL ft ft MSL ft m <br /> EW-2 10/27/99 <50 0 NA <0 500 0 518 <0 500 <0 500 b 1,620 6410 29 68 NA 3442 NA a <br /> EW-2 1/12100 <50 0 NA <0 500 <0 500 <0 500 <0 500 899 126 6410 2913 NA 3497 NA 08 <br /> EW-2 4117100 <50 0 NA <0 500 <0 500 <0 500 <0 500 2,060 2,100 6410 2707 NA 3703 NA 25 <br /> EW-2 7121100 <50 0 NA I <0 500 <0 500 <0 500 <0 500 <2 50 <1 00 6410 2937 NA 3473 NA 1 3 7 <br /> Abbreviations <br /> TPPH=Total petroleum iydrocarbons as gasoline by modified EPA Method 8015 <br /> TEPH=Total petroleum iydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX=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 /> I <br /> <n = Below detection lien t <br /> NA=Not applicable <br /> I <br /> i 4 ' <br /> Page 7 <br />