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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 1267 Country Club <br /> Stockton, CA <br /> Wlc #204-7524-0204 <br /> MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPH TEPH B T E X 8020 8260 TOC Water Elevation Thickness <br /> (ug/L uIL (u IL) (u IL) (u IL) (u IL (ug/L (ug/L MSL ft (MSI ft <br /> i <br /> S-6 11/10/1998 <50 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA 400 1300 -900 NA <br /> S-6 02/11/1999 <50 0 <60 0 <0 500 <0 500 <0 500 <0 500 <2 00 <0 500* 400 1201 -801 NA <br /> S-6 05/06/1999 <50 0 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00 <2 00 400 1062 -662 NA <br /> S-6 08/31/1999 <50 0 <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 <2 00 400 1061 -661 NA <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 <br /> TEPH=Total petroleum hydrocarbons 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 /> 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 /> ND= Not detected at or above the minimum quantitation limits <br /> Notes <br /> MTBE by EPA method 8260 was run out of recommended hold time,value should be considered an estimate <br /> Page 3 <br />