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P/SHAR2E/GWROD.30 <br /> 01/07/93 <br /> The state has accepted the FS and endorses implementation of Alternative 1A to <br /> remediate groundwater. <br /> 8.9 COMMUNITY ACCEPTANCE <br /> Based on the public review and comment on the Proposed Plan, the community <br /> has no significant concerns regarding selection and/or implementation of any of <br /> the alternatives investigated by DDRW to remediate contaminated groundwater. <br /> 9.0 THE SELECTED REMEDY <br /> Based on consideration of the requirements of CERCLA, the detailed analysis of <br /> alternatives, and public comments, DDRW, SHARPE, EPA, and the State of <br /> California have determined that Alternative 1A, Groundwater Extraction and Air <br /> Stripping, is the most appropriate remedy for SHARPE. This alternative consists <br /> of groundwater extraction and air stripping using packed towers to achieve the <br /> ARLs and EDSs defined in Tables 8 and 9. Alternative 1A includes the following <br /> components for each of the three treatment areas (i.e., North Balloon, South <br /> Balloon, and Central Areas): <br /> 1. Extraction wellfield and associated piping network to remove <br /> groundwater from the contaminated aquifer zones; <br /> 2. Equalization tank designed to stabilize groundwater flow and VOC <br /> concentrations in the influent (in Central Area only); <br /> 3. Air stripping systems consisting of countercurrent packed towers <br /> designed to remove VOC contamination from groundwater (includes <br /> treatment of air stripper offgases with carbon adsorption in the Central <br /> Area); and <br /> 4. Groundwater discharge via surface water discharge, water <br /> reuse, and evaporation ponds with connector/injection wells. <br /> The goal of this remedial action is to restore groundwater to its beneficial reuse. <br /> Based on information obtained during the RI (ESE, 1990) and on a careful <br /> analysis of all remedial alternatives, EPA and the State of California believe that <br /> the selected remedy will achieve this goal. However, studies suggest that <br /> groundwater extraction and treatment are not, in all cases, completely successful <br /> in reducing contaminants to health-based levels in the aquifer. EPA and the <br /> State of California recognize that operation of the selected extraction and <br /> treatment system may indicate the technical impracticality of reaching health- <br /> 56 <br />