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C-SHADRIFS91.6/GWPP.9 <br /> 01/22/92 <br /> Alternative 2, GAC treatment, involves pumping contaminated groundwater <br /> through a bed of granular activated carbon (GAC) which is capable of removing <br /> contaminants from groundwater through adsorption. This alternative has an <br /> estimated present-worth cost of $6,264,000 and requires 16 years to complete <br /> remediation. The major components of Alternative 2 are the same as for <br /> Alternative 1 with GAC treatment substituted for the air stripping system. <br /> Alternative 3, ozonation with hydrogen peroxide (H2O2) and ultraviolet (LTV) <br /> light, converts contaminants in the groundwater water to innocuous compounds <br /> (such as water, carbon dioxide, and chloride ion) which remain in the water. <br /> This alternative has an estimated present-worth cost of $6,976,000 and requires <br /> 16 years to complete remediation. The major components of Alternative 3 are <br /> the same as for Alternative 1 with an ozonation unit with W light and <br /> secondary H2O2 treatment substituted for the air stripping system. <br /> Alternative 4, fixed-bed biological towers, uses microbial bacteria, which are <br /> supported on media in a tower, to biologically remove contaminants from the <br /> groundwater. This alternative has an estimated present-worth cost of <br /> $9,655,000 and requires 16 years to complete remediation. Alternative 4 would <br /> also reduce VOC concentrations in the groundwater to acceptable levels. The <br /> major components include: <br /> Extraction wellfield and associated piping network; <br /> Equalization tank to stabilize organics and groundwater flow in the <br /> influent; <br /> Nutrient feed to enhance growth of microorganisms; <br /> Air source to provide oxygen to the aerobic microorganisms; <br /> Three fixed-bed biological towers to reduce organics in groundwater; <br /> 11 <br />