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C-SHADRIFS91.6/GWPP.10 <br /> 01/22/92 <br /> Effluent clarifier to provide solids/liquid separation prior to effluent <br /> discharge; <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 ponds with connector wells. <br /> Alternative 5, termed the no-action alternative, involves monitoring only and has <br /> an estimated present-worth cost of $1,228,000. The National Oil and Hazardous <br /> Substances Pollution Contingency Plan (NCP) requires that the no-action <br /> alternative be considered at every Superfund site for comparison to other <br /> alternatives. Use of this alternative would leave the site in its current condition; <br /> however, groundwater monitoring would be conducted so that contaminant <br /> migration pathways could be evaluated. Quarterly monitoring would be ongoing <br /> using the existing network of wells onsite for approximately 4 years until site- <br /> wide cleanup is implemented. <br /> DISPOSAL OF TREATED GROUNDWATER <br /> All of the remaining treatment alternatives, with the exception of the no-action <br /> alternative, would use multiple disposal alternatives for the treated groundwater <br /> (Map 2). Disposal would consist of pumping treated groundwater to: <br /> Surface water, <br /> Water users (local industry and agriculture), and <br /> Evaporation/infiltration pond with connector wells. <br /> Currently, disposal of the treated groundwaters from the interim treatment <br /> systems at the North and South Balloon Areas is to surface water and through <br /> reuse. The only disposal alternative capable of managing the entire final volume <br /> 12 <br />