2024-05-03_PERMIT FILE - C1980007 (2)

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2.05-85 Rev. 11/96- PR07; 04/06-PR10; 12/14- TR136, 04/24 – TR153 Backfill and Grade 16 Weeks Replace topsoil 14 Weeks Seed 3 Weeks * Refer to Exhibit 77 for detail of the Reclamation Plan. ** Tasks could occur concurrently Post-Mining Drainage and Sediment Control Plan This plan is being carried out in three phases. The timing of each phase will be determined based upon the establishment of sufficient vegetation to control runoff. Phase One will involve the removal of all surface facilities (except those described below), backfilling and recontouring, as necessary, all cuts and fills. All unnecessary access and haul roads will be removed as described in the Diversions and Collection Ditches and Impoundments Section. Only the main access road will be retained to access the main drainage ditches. During this phase however, even this road will be partially reclaimed, leaving only enough road width to allow passage of a pickup truck. All sedimentation ponds which are needed to maintain sediment control during this initial reclamation phase will be retained. Phase Two will begin when the vegetation becomes sufficiently established to reduce the sediment load from runoff so that with control measures such as water spreading, undisturbed area water quality conditions can be met. At this time, the sedimentation ponds would be removed. Since the post-mining land use is grazing and wildlife habitat, portions of some of the sedimentation ponds may be converted to wildlife and livestock watering ponds. This of course, would be done in cooperation with the appropriate regulatory authorities. During this phase, the major ditches flowing to Sedimentation Ponds MB-1 and 2 will be water- barred to spread the runoff over the established vegetation for irrigation and filtering. In steep areas, where erosion may be a problem, small catchment basins made from straw bales or soil may be built to slow the velocity and retain sediment. During Phase Three, the remaining access road and ditches will be reclaimed when water quality monitoring indicates that the vegetation is sufficiently established to control sediment loading and that undisturbed area water quality conditions are being met by the runoff. Any small remaining areas that need reseeding and mulching will be revegetated at this time. (2) Reclamation Cost Estimate The revegetation cost estimate (Exhibit 53) represents the estimated costs for demolishing facilities, backfilling and grading, and revegetating the West Elk Mine site. These costs are expressed in the current dollar value at the time of calculation; however, most areas will not be scheduled for revegetation until mine closure. (3) Backfilling and Grading Information on backfilling and grading has been presented throughout Section 2.05.4. Please refer