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-WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 1267 Country Club <br /> Stockton, CA <br /> MTBE MTBE Depth to GW SPH <br /> well 10 Date TPPH TEPH B T E x 8020 6260 TOC Water Elevation Thickness <br /> u !� fL. u i_ u fL U&)( u 11< (u/L (ug/L MSL ft. MS, ft. <br /> i S-6 06103/2002 NA NA NA NA NA NA NA NA 3.99 12.50 II -8.51 NA <br /> S-6 0810$12002 NA NA NA NA NA NA NA NA 3.99 13.73 ]+ -9.74 NA <br /> S-6 11/15/2002 NA I NA NA NA NA NA NA NA 3.99 14.76 -10.77 NA <br /> S-6 0//0312003 L <50450 <0.50 <0.501 <0.50 <0.50 NA 840 3.99 94.04 -10.05 NA <br /> Abbreviations: <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method82508; prior to January 29, 2001,analyzed by EPA Method 8015. <br /> % TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015. <br /> STEX=Benzene,toluene, ethylbenzene,xylenes by EPA Method 82608; prior to January 29,2001, 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 /> ug1L= 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 /> NO= Not detected at or above the minimum quantitation limits. <br /> Notes: <br /> *MTBE by EPA method 8260 was run out of recommended hold#Ime;value should be considered an estimate. <br /> a=This sample was analyzed outside of EPA recommended hold time. <br /> Site surveyed January 7,2002,by Virgil Chavez Land Surveyingof Vallejo,California. <br /> P 6 <br />