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GOLDEN GRAIN COMPANY 43 <br /> December 21, 1989 <br /> 202/799-5045.06 <br /> 5.5 GROUNDMI-M EXTRACTION AND TREATMENT <br /> The remedial action of groundwater extraction and treatment <br /> involves the installation of a recovery well to pump groundwater <br /> to the surface for treatment prior to discharge (to the sanitary <br /> or storm sewer system) or re-infiltration. The pumping action <br /> creates a cone of depression that hydraulically controls miara- <br /> tion of hydrocarbons in the water and induces flow toward the <br /> well. Discharge of the treated water in an upgradent well or <br /> gallery can enhance this movement. Treatment options for the <br /> extracted water would depend on the rate and degree of treatment <br /> required, but would typically consist of air stripping, carbon <br /> adsorption, or biological treatment. The advantages and disad- <br /> vantages of groundwater extraction and treatment are as follows: <br /> Groundwater Extraction and Treatment Advantages: <br /> r 1. Logistically simple to install with minimum inter- <br /> ference to land use. <br /> 2. Hydrocarbons would be ramoved from groundwater. <br /> 3. The volume of contaminated sails displaced is minimal. <br /> 4. Proven technology for establishing hydraulic control, <br /> especially in permeable layers such as those that <br /> dominate this site. <br /> 5. A single well may be adequate to establish hydraulic <br /> control. <br /> GROUNDWATER <br /> i <br /> TECnNOLOGY,INC. <br />