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i TAS 1 i <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 2575 Country Club Boulevard <br /> Stockton,California <br /> WIC#204-7524-3505 <br /> Sample Measured Corrected SP TPPH B T E X MTBE Methanol Comments <br /> GW Depth GW Elev <br /> Date (ft) (ft) (ft) (ug/L) (ug/L) (ug/L) (uglL) (uglL) (ugl) (ug/L) <br /> RW-1A(DUP) <br /> 30-Jul-96 NA NA NA 140000 23000 28000 <500 14000 820000 NA MTBE by EPA Method 8260 890000 ppb <br /> 02-Apr-97 NA NA NA 130000 15000 24000 3400 19000 450000 NA <br />' VOCs ND except Benzene 14004,Toluene 18000 <br /> ppb Xylenes 13000 All in ppb <br /> Oxygenate Compounds ND except for MTBE 350000 <br /> 02-Sep-97 NA NA NA 130000 15000 21000 2900 16000 360000 240000 ppb <br /> Oxygenate Compounds by 8260 ND except for MTBE <br /> 02-Dec-97 NA NA NA 54000 6300 8800 1500 8400 180000 77000 190000 ppb <br /> Abbreviahoms <br /> NA=Not analyzed or not available <br /> (DUP)=Duplicate sample <br /> <x=Not detected at detection limit of x <br /> TP PH=Total Purgeable Petroleum Hydrocarbons carbon range C6 to C12 by EPA Method 8015(Modified) <br /> (previously Total Petroleum Hydrocarbons as Gasoline) <br /> BTEX=benzene,toluene,ethylbenzene,and xylenes by EPA Method 8020 <br /> MTBE=methyl tertiary butyl ether by EPA Method 8020 <br /> SP=Separate Phase hydrocarbon <br /> Oxygenate Compounds = tertiary butane!(TBA),methyl-tertiary-butyl ether(MTBE) di isopropyl ether(DIPS),ethyl tertiary butyl ether(ETRE) <br /> and tertiary amyl methyl ether(TAME)by EPA Method 8260 <br /> Notes <br /> a=Depth to ground water measurement and reference elevation datum is top of boot(adapted for vapor extraction)at well head <br /> b=Depth to ground water measurement and reference elevation datum is notchedimarked on top north side of well casing <br /> Elevation referenced to mean sea level It measurable product was noted,elevation corrected using hydrocarbon specific gravity of 0 8 <br /> I <br /> 240-0783 8 <br />