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AWurM <br /> aim' l■�sWES, <br /> Working to Restore Nature <br /> and benzene for the most recent monitoring event (November 29, 1993) are shown on Plate <br /> 12. The analytical results are summarized in Table 11 <br /> 6.0 REMEDUTION OPTIONS <br /> 6�1 Soil Remediation <br /> Based upon the results obtained during the VET,we conclude that soil beneath the site can <br /> be remediated by vapor extraction (RESNA, February 10, 1992) Based upon the estimated <br /> limits of residual hydrocarbons in soil and the evaluated radius of influence for vapor <br /> extraction system wells at the site, it is our opinion that the existing vapor extraction system, <br /> with the addition of two vapor extraction wells, will be adequate for sal remediation in the <br /> vicinity of the tank cavity <br /> 6_2 Groundwater Remediation <br /> As an alternative to conventional groundwater pump and treat and aboveground treatment, <br /> air sparging can be used to provide in-situ soil vapor extraction and air-stripping to remove <br /> residual gasoline hydrocarbons from sal and dissolved hydrocarbons from groundwater <br /> Air sparging involves infecting pressurized air below the water surface to "strip" dissolved <br /> hydrocarbons from the groundwater to the vadose zone and remove residual hydrocarbons <br /> from the saturated soil Air bubbles that exit the sparge well move vertically and <br /> horizontally through the saturated soil column "stripping" dissolved hydrocarbons from <br /> groundwater Hydrocarbon vapors entrained in the air bubbles rise through the saturated <br /> zone into the vadose zone Control of off-gas in the vadose zone is accomplished using a <br /> conventional vapor extraction system Data collected and evaluated from the sparge pilot <br /> test indicate air sparging is feasible for removing dissolved hydrocarbons from the capillary <br /> it 30003-7 10 <br />