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TAB 18 <br /> HYDROLOGIC RECLAMATION PLAN <br /> Introduction <br /> The hydrologic reclamation plan is presented in two parts. The first part focuses on <br /> specific practices which are conducted to minimize the impact of mining on the hydrologic <br /> balance within and adjacent to the leasehold. The second part addresses those impacts <br /> that may occur regardless of these practices. The emphasis of the second part is on the <br /> monitoring of the extent and magnitude of mining impacts. Where possible, reference has <br /> been made to those chapters which contain details regarding certain practices. <br /> Practices Employed to Minimize the Impacts of Mining on the Hydrologic System <br /> Ground Water Quality. The mining practices that involve replacement of spoil material <br /> into mine pits are detailed in Tab 20, Backfilling and Grading. Topsoil and overburden <br /> handling plans are detailed in Tab 21 , Minesoil Reconstruction. Based on extensive <br /> analysis performed on lithologic and ground water data (see Tab 6, Geology and Tab 17, <br /> Probable Hydrologic Consequences), it was found that no acid or toxic materials are <br /> present in significant amounts in either the Nucla Mine or Nucla East mining area and that <br /> replaced spoil will only have a minimal short term impact on ground water quality. <br /> Because of these findings, no special handling of materials is anticipated for mining <br /> operations conducted in either area, with the exception of the 5W pit located at the Nucla <br /> Mine. <br /> Each exploration hole, other drill or borehole, well , or other exposed underground opening <br /> except those used solely for surface blasting will be plugged or sealed to prevent acid or <br /> toxic drainage from entering the ground water, minimize disturbance to the prevailing <br /> hydrologic balance, and ensure safety. Any holes, wells or other exposed underground <br /> opening that will be temporarily inactive but eventually used for mining related purposes <br /> will be temporarily sealed at the surface and secured and protected for safety by surface <br /> structures or barricades. <br /> Permanent sealing of holes, wells or other exposed underground openings not completed to <br /> aquifers will be sealed by replacing cuttings or other suitable media in the hole. A <br /> suitable plug will be placed ten feet below the ground surface to support a cement plug or <br /> other media to within three feet of the ground surface. Permanent sealing of holes, <br /> 18-1 Revised 04/11/88 <br />