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openings and portals and all shallow open pits with severe vertical drops will be backfilled with additional waste-dump materials located at the site and then will be slightly mounded to preclude future subsidence. RECONTOUR AREAS OF DISTURBANCE After the mine openings and portals are successfully and permanently closed, all azeas of disturbance will be recontoured to blend in with the natural topography, as practicable. This recontouring includes • Reducing the slopes of the remaining waste-dump materials to less than a 3 to I ratio, while providing a basin effect on the top of the waste-dump materials to collect and contain all storm waters that contact the site. • Removing waste-dump materials from the existing natural drainages, as practicable, and eliminating the potential for these materials to enter the drainages in the future. • Recontouring the immediate azeas to provide an undulating surface that closely represents the natural surrounding topography. Any azea of disturbance that has revegetated naturally during the past several decades will not be redisturbed unless physical hazards exist that must be addressed. In either case, as much of the existing vegetation regrowth will be left (as practicable) during the reclamation efforts. Any topsoil that was previously stockpiled on the site or is in the immediate vicinity of the site will be spread across the disturbed azeas to promote revegetation. If topsoil has not been previously stockpiled or is not available within the disturbed azea, it will not be mined at another location and hauled in. A second azea of disturbance will not be created to enhance the reclamation efforts or success of the initial azea. All disturbed azeas will then be reseeded with a BLM-approved mixture of native grasses and shrubs developed for the specific climatic conditions. REDIRECT ALL STORM WATER Several efforts will be undertaken to control the effects that storm waters have on the abandoned mine site. First, all mine entrance locations will be backfilled sufficiently to provide positive drainage away from the entrance azea. Second, the waste-dump materials will be recontoured to create a basin on top of the waste-dump materials that will collect and contain all storm waters that come in contact with it. The basin will be constructed to create minibasins within the major basin feature to promote individual collection points that could enhance the revegetation efforts. Storm waters collected in the basins will be allowed to evaporate from or percolate through the basin. Third, all major drainage features leading onto the mine site will be diverted azound the site or stabilized in place to reduce the overall effects that major storm-water events could have on the reclamation efforts and the abandoned site in general. The last step will be to place silt fences or other suitable devices within and across the drainages leaving the mine site to preclude the transport of sediments from the site to downstream locations. REDUCE PQ,V.3'-IAI: EXPOSURE TO RADIOACTIVE MATERIALS All abandoned uranium mines have naturally occurring radioactive materials (NORM) associated with diem in the form of 1) low-grade materials that aze uneconomic to transport and mill or 2) residnal'ore-stocl~ile materials. Outcrops ofuranium-bearing formations often exist at the mine sites an"d'Yepreserit the initial uranium discoveries that led to the mines' development. These radioactive materials are a potential source of radiation exposure to the general public and the environment. However, it is often cost prohibitive, if not entirely impossible, to eliminate these NORM sources from the environment. It is DOE's policy to minimi~r the potential exposure to the general public resulting from mining-related radioactive materials. During reclamation activities on DOE lease tracts, the following measures will be taken to reduce or limit the potential for exposure to NORM: 1278-tab.doc