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*BLE 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 I I <br /> Date (ft) (ft) (fl) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) <br /> VOCs NO except Benzene 14000,Toluene 18000 <br /> ppb,Xylenes 13000 All in ppb <br /> Oxygenate Compounds NO except for MTBE 350000 <br /> 02-Sep-97 NA NA NA 130000 15000 21000 2900 16000 360000 240000 ppb <br /> i <br /> xygena a Compounds By 8260 NU except or MTBE <br /> 02-Dec-97 NA NA NA 54000 6300 8800 1500 8400 180000 77000 190000 ppb <br /> I <br /> Abbreviations, <br /> NA=Not analyzed or not available <br /> (DUP)=Duplicate sample <br /> <x=Not detected at detection limit of x <br /> TPPH=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 butanol(TBA),methyl-tertiary-butyl other(MTBE),di-isopropyl ether(DIPE),ethyl tertiary-butyl ether(ETBE), <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 notched/marked on top north side of well casing <br /> Elevation referenced to mean sea level If measurable product was noted,elevation corrected using hydrocarbon specific gravity of 0 8 <br /> 2400783 9 <br />