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` - 4 Alternative A2--Excavalion with On-Site Incineration. This method involves excavating the soil and thermally treating it on site with a rotary-klln incinerator. Tile incineration process will destroy the BTX compo•tnds in the soil matrix. Once the BTX compounds have been destroyed, the soil would be used zs backfill. The excavation and incineration procc;ss would be completed within about I year. Alternative A3--Insiiu 'foil Aeration With Vapor Phase GAC Filtration. T1us method involves collecting the volatilized BTX compounds ut an insitu soil aeration system and then adsorbing the vapors onto a vapor phase granulated activated carbon (GAC) filter. This alternative can be separated into two processes. (1) the insitu soil aeration system and (2) the vapor phase GAC filtration system. The soil aeration system will draw air through the contaminated soil matrix by inducing a vacuum between air intake wells and an air collection well. As the air is passed through the soil the liquid phase BTX compounds in the soil matrix will volatilize into the airstream. The airstream containing the volatilized BTX compounds will be collected in the air collection well. The collected air will be routed to the vapor phase GAC emission control system. A plan and profile schematic of the insitu soil aeration _. system is shown on Figure 2. The vapor phase BTX compounds will be adsorbed to the GAC. The GAC £'titration system would consist of two down-flow GAC Filters in series. The soil aeration system would be expected to operate for about I year. Alternative A4--insitu Soil Aeration With Vapor Incineration. Ibis alternative incorporates the same soil' aeration system as Alternative A3, except the GAC Filtration system is replaced with an incineration process. The incinerator would be a two-chamber incinerator capable of 99.99 percent destruction efficiency. The system would be in r . I operation for about I year. Contaminated Groundwater Remediation Three remediation alternatives were analyzed to determine the preferred method for removing the product from the groundwater. Alternative 131--Groundwater Extraction/Reinjection With On-Site Biological Treatment. This alternative involves extracting the groundwater from the aquifer, treating it in a ! biological reactor, and reinjecting it back into the aquifer. The biological reactor would consist of a gasoline/water separator, an aerobic Fixed-Film biological reactor, gravity s filter,aqueous phase GAC,and disinfection. g The extraction well and injection well system will be located such that the injection well will be within the zone of influence of the extraction well. Therefore, the treated groundwater injected into the aquifer will flow toward the extraction well. The extraction wel!/injection well system will allow for recycling of the treated eff4uent for additional treatment. The system would be expected to be operated for about Iyear. f _--"-- -_ Alternative 112--(;roundwater Extraction/Reinjection-With Aqueous Phase GAC l+iltralion:- — - nvolves extractingthe groundwater, passing it through a gasoline/water - separator, a series of down-flow GAC filters, and reinjecting the treated effluent into the aquifer. The system would operate for about I year.. f i