SITE INFORMATION AND CORRESPONDENCE

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and groundwater is feasible. Uriah recommends, therefore, that a field study be performed to determine whether this proven and cost effective technology may be employed at the site. Existing groundwater monitoring wells appear to be appropriately located for use as extraction/injection wells_ These wells would permit the removal of any non-aqueous phase liquid contaminants ( free product) and groundwater containing significant concentrations of dissolved constituents. Upon extraction, these fluids would be delivered to a surface storage tank_ Contaminated water would be pumped from the bottom of the storage tank and delivered to the bioreactor for treatment and subsequent discharge. Residual free product would remain in the tank until collected for recycling, or until mixed with an emulsifier and introduced into the bioreactor for treatment.The emulsifier would convert the free product into a colloidal material that would make the hydrocarbon material available for prompt degradation. The primary component of a fixed-film or fluidized-bed bioreactor system is the columnar reactor vessel which contains a consortium of non-pathogenic, hydrocarbon utilizing bacteria capable of thoroughly degrading ( i .e. mineralizing) hydrocarbon contaminants to form the non-toxic end products of carbon dioxide, minerals, and water. These bacteria would be resident upon activated carbon, or similar material, which would serve as attachment substrate and encourage the development of the high biomass necessary for rapid degradation. Nutrients would be metered into the system to support biological growth; while the hydrocarbon contaminants within the extracted water would provide the carbon necessary to meet bacteria metabolic and energy requirements. The oxygen required for the aerobic process would be supplied by a small compressor, with influent water and the compressed air providing the force necessary to fluidize the treatment bed substate if such fluidization is deemed appropriate. Subsequent to being treated within the bioreactor, a portion of the remediated water- now rich in dissolved oxygen, nutrients, and viable biomass, could be injected into vadose soil containing residual hydrocarbons in order to facilitate in-situ bio- degradation of these compounds. Illustrations of both soil vapor extraction and bioreactor systems are enclosed for your information. Additional information regarding these technologies and their site specific applications may be provided upon request. If you have any questions, or if I may otherwise be of 3 .