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contaminants, and the configuration would have a will operate for at least 50 years. ETR techr <br /> Cher <br /> plumes. A small percentage an accepted,proven technology that can be <br /> minimal effect on o p p <br /> contaminant mass would not be to perform reliably with proper mai <br /> �2 percents of the cont r. <br /> silts; however human health Recirculating well technology is used <br /> captured or caught ins <br /> and ecological risk associated with that portion is contaminant mass removal south of Sandwi <br /> Because ETR is a proven technology, r( <br /> very low. <br /> • agency involvement to obtain approval <br /> Socioeconomic impacts associ0 ated with the minimal. <br /> uncaptured portion of the plume, such as impacts on <br /> commercial or residential interests recreation, and Most of the ETR wells would be installed <br /> sites are expected to be property, greatly simplifying access to the <br /> historical and archeologicalp <br /> Institutional controls will prohibit drilling of tions. Recirculating wells, however, v► <br /> low. Inst P <br /> 'n or in the direct path of,the CS-10 installed on private property between i <br /> new wells within, p <br /> 1 Road and Ashumet Pond. Because reci <br /> groundwater plume. Residences over or directly <br /> of the fume have been or are wells are somewhat less intrusive than E <br /> down grad ient p <br /> scheduled to be connected to Public water supply. nology, it is anticipated that property <br /> There may adequate controls on existing possi <br /> Th y not be ble,though perhaps difficult. <br /> wells. <br /> Manageable risks to human health are ai <br /> ` Effectiveness of Treatment Systems: The ETR during construction and operation of t t <br /> ion of the treatment s stem is capable of Treatment plants would be located on b <br /> part Y <br /> ' and EDB to below detection limits. minimizing potential risks to the off-base <br /> removing VDCs <br /> , <br /> Other contaminants such as semi-volatiles and hood. Recirculating wells would present h <br /> inorganics, would also be treated to background the off-base neighborhood. <br /> levels, if technically and economically feasible, if Adverse impacts to rare species, to rar <br /> the appear <br /> in the extracted water. The 1 in and communi <br /> Yhabitats,to a coastal,p a p t) <br /> recirculating wells remove only VOCs and will not' , wetlands complex are expected, but can <br /> � tiles or in <br /> p • <br /> effectively remove EDB, semi-vola gated with a moderate level of scheduling <br /> organics without additional above-ground processes, struction planning. The impacts associ� <br /> which are not included in this alternative. These construction along the Ashumet Pond <br /> contaminants are not anticipated in the vicinity of s far recirculating well technc <br /> would be les g <br /> the recirculating wells. If EDB, semi-volatiles, or <br /> for ETR. <br /> inorganics are detected in the plume at levels <br /> treatment systems would Construction and operation would cause <br /> requiring action,additional t y y • <br /> be added. socioeconomic impacts on the residential <br /> hood near Ashumet Pond because <br /> Spent carbon produced by the system would be rhood. <br /> p recirculating wells in the neighbo <br /> transferred offsite for regeneration, which destroys <br /> the contaminants. Residual solid wastes would be Cost: Total annual capital cost is estimi <br /> transferred o p appropriate offsite and disposed of in an a ro riate $45.8 million. Annual operating and mE <br /> manner. The residual solid wastes are not expected cost is*estimated to be $3.8 million. Life-� <br /> to be a hazardous waste. Risks to workers including capital cost, based on 20 years <br /> with handling, treating, and disposing of tion for cost-estimating purposes only) is <br /> associatedg� g� p g <br /> residuals would be low. The alternative satisfies a to be$122 million. <br /> statutory preference for treatment as a principal <br /> Public Acceptance. The public acce pto <br /> element. the response alternatives will be d <br /> Implementability: Full system startup would begin throughout the public comment period. T <br /> by the EPA-enforceable milestone of June 28, 1999. tive organizations, agencies, and commun <br /> f Partial system startup may be achievable for the (acceptance groups)will review the inforn <br /> Sandwich Road extraction fence in less than 12 indicate a preferred choice, acceptable s+ <br /> months from the decision date, given funding and third choices,and any unacceptable altern� <br /> regulatory approval. It is estimated that the system <br /> 8 <br />