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® �I1 tra rs nl Far r p aht.LX gen E=xid,r. reztment <br /> This treatment method destroys dissolved organic <br /> contaminants in water by means of chemical <br /> oxidation. ultraviolet light (W) catalyzes the <br /> chemical oxidation of organic contaminants in water <br /> by its combined effect upon the organic contaminant <br /> and ita reaction with hydrogen peroxide. Hydrogen <br /> peroxide radicals formed by reaction with EIV light <br /> are very powerful chemical oxidants which will <br /> react with any organic contaminants in the water. <br /> W treatment systems are not widely used for <br /> treatment of large volumes of ground water. The <br /> systems are prone to problems leading to effluent <br /> concentration violations. <br /> 9.4.5 Analysis of Viable Options <br /> Since all basic treatment options meet the established <br /> remedial objectives and evaluation criteria set forth <br /> herein, the preferred alternative can therefore be selected <br /> on the basis of cost, reliability, and ease of <br /> _ implementation. <br /> Based on preliminary screening of alternatives, trenching <br /> was determined to be not viable for recovery of ground <br /> —' water at this site since the volume and extent of free <br /> product does not warrant the construction of a recovery <br /> trench. The free product is located in the underground <br /> storage tank area where recovery can be accomplished <br /> through existing wells. Additionally, biological and UV <br /> treatment methods were determined to be unacceptable in <br /> terms of implementability, cost, and reliability, while air <br /> stripping was determined to be not applicable since <br /> influent concentrations of dissolved hydrocarbons will be <br /> relatively low (less than 10 ppm. ) <br /> 9.5 gelectigM of preferred alternati'm <br /> Based on the preceding evaluation of alternatives, it is <br /> apparent that the most viable option for ground water <br /> remediation to meet the established remedial objectives and <br /> evaluation criteria is recovery of water fron existing wells <br /> (or additional recovery wells) followed by activated carbon <br /> treatment and discharge of water to the sanitary sewer. <br /> Therefore, the recommended course of action is to install a <br /> ground water recovery and treatment system using activated <br /> carbon followed by discharge of treated water to the sanitary <br /> r - - <br /> --sewer.--. periodic--pumping-of--free-floating--product- from-mw <br /> will also be a part of the overall ground water remediation. <br /> 24 <br />