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Available information and analyses indicate that the potential for impacts to springs and seeps due to mining and <br />subsidence is minimal (worst-case projections) to negligible. <br />GENERAL SUMMARY AND CONCLUSION <br />The described streamflow and water quality impacts for expansion of underground mining into the EMD at the <br />Foidel Creek Mine are within the limits of impacts discussed by Kaman Tempo (1982) and by Parker and Norris <br />(1983) relative to the study area. It is apparent that such hydrologic impacts are relatively greater in stream <br />reaches near mine discharges. Mine discharges may be treated, as necessary, to reduce levels of total suspended <br />solids, and possibly to settle out oxidized trace metals prior to discharge to a stream. For the most part, <br />dissolved solids and major ionic solute concentrations associated with mine flows will be unaffected by <br />treatment, and will be mixed with receiving stream waters. Total Recoverable Iron will be removed by the FCB <br />treatment facility at Site 115. <br />Dissolution of soluble minerals will occur as a result of the process of dewatering and handling of discharged <br />water from the underground mine. Because ongoing underground mining opearations, and adjacent surface <br />mined areas are located in areas recharging groundwater to the overburden unit,. hydro-geochemical changes in <br />water flowing through this unit have already occurred and are expected to continue. The supporting analysis <br />conducted to assess these changes is included in the groundwater PHC section. <br />PR09-08 2.05-164 10/29/09