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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> �r <br /> 620 West Charter Way <br /> CStockton, CA <br /> �Wic #204-7524-4305 <br /> MTBE MTBE Depth to GW SPH DQ <br /> Well ID Date TPPH B T EX 8020 8260 TOC Water Elevation Thickness Reading <br /> u 1L u IL u IL u IL u IL u IL (u/L MSL ft MSL ftm <br /> 1[ 11 <br /> MW-10 05/25/1999 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00 NA 8837 1802 7035 NA 19 <br /> MW-10 08/18/1999 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00 NA 8837 1843 6d 94 NA 14 <br /> MW-10 11/05/1999 <50 0 <0 500 <0 500 <0 500 ][ <0500 <2 50 NA 8837 1896 6941 NA 12/14 <br /> MW-10 102/22/20001 <50 0 1 <0 500 <0 500 <0 500 ][ <0 500 <5 00 NA 8837 18 17 7020 NA 06/16 <br /> a <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline 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 /> <n= Below detection limit <br /> D=Duplicate sample <br /> NA=Not applicable <br /> n!n = Pre-purge/Post-purge <br /> Page 18 <br />