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C-SHADR[FS91.6/GW PP.B <br /> 01/22/92 <br /> alternatives and two optional components (for the Central Area only) for <br /> groundwater cleanup at SHARPE. <br /> At this site, arsenic in groundwater is not mobile and does not appear to <br /> threaten the water quality at potable wells. However, groundwater extracted for <br /> VOC treatment may have to be treated for arsenic (via one of the two optional <br /> components) so it can be properly reused. <br /> Alternative 1, air stripping, has an estimated present-worth cost of$4,147,000 <br /> and would require 16 years to complete remediation. Alternative 1 consists of <br /> the technologies to pump and treat groundwater (North and South Balloon Areas <br /> and Central Area) and treat air emissions from the air stripper (Central Area <br /> only). The air stripper will be designed to reduce VOC concentrations to <br /> acceptable levels. Air stripping is a mass-transfer process in which a liquid (for <br /> example, groundwater) containing volatile compounds is brought into contact <br /> with air, and an exchange of gases takes place between the air and the liquid. <br /> The major components include: <br /> Extraction wellfield and associated piping network; <br /> Equalization tank to stabilize groundwater flow and VOC <br /> concentrations in the influent (Central Area only); <br /> Air stripping system consisting of two countercurrent packed towers to <br /> remove VOC contamination; <br /> Gas-phase carbon adsorber for treatment of offgas (Central Area only); <br /> Optional groundwater treatment for arsenic removal (Optional <br /> Component A or B in the Central Area only); and <br /> Groundwater disposal via surface water discharge, water reuse, and <br /> evaporation/infiltration ponds with connector wells. <br /> 10 <br />