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toward the recovery well or trench. In this manner, ground water containing dissolved <br /> gasoline hydrocarbons is removed from the subsurface and pumped to aboveground storage <br /> and treatment facilities. The extrac:cd ground water is then treated to remove the dissolved <br /> hydrocarbons; the treated Nvater is subsequently discharged to the sanitary sewer system, <br /> reinjected into the aquifer, or hauled to an appropriate disposal facility. Hydrocarbon <br /> concentrations in extracted ground water can be reduced by a variety of methods, including <br /> air stripping, carbon filtration, bioremediation, or oxidation by chemical reaction or <br /> ultraviolet light irradiation. The method used is dependant on the rate of ground-water <br /> extraction,the initial hydrocarbon concentrations,and the target hydrocarbon concentrations <br /> in the treated water. Under some circumstances,extracted ground water with relatively low <br /> concentrations of dissolved hydrocarbons can be discharged directly to the sanitary sewer <br /> without treatment. <br /> Ground-water remediation by extraction and treatment is a conventional technique and may <br /> be applicable at the site. Design of the recovery and treatment facilities will require <br /> additional hydrogeologicaI investigation, including installation of a pumping test/recovery a <br /> well and conduction and analysis of a pumping test. Data from the pumping test will be <br /> used to evaluate the hydraulic characteristics of the affected aquifer and to estimate Ill- <br /> design <br /> lt_design parameters of the recovery and treatment facilities. <br /> Applied GOOSYS MS <br />