2011-01-13_PERMIT FILE - C1981038A (6)

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• 2.05.3 mine site. Suitable unconsolidated material (subsoil) has been used to repair washout areas and to further promote the re-vegetation efforts throughout the mine site. Topsoil has been removed, stored, and reused for re-vegetative efforts along the channel. Areas to store topsoil have been designated and marked for temporary use. See Map 8-1 for location of existing topsoil storage areas. An auxiliary diversion ditch was constructed to protect the disturbed area in case of main diversion channel instability. It is 858 feet in length and was constructed during the Fall, 1982. The ditch, which traverses the outside edge of the fan level, empties into the large diversion ditch drainages on each end of the bench. The auxiliary ditch carries drainage from the fan level bench and serves as a back-up system for the large diversion ditch. The ditch was constructed during an extensive drainage reconstruction project ofthe fan and crushing and screening levels, which took place during the Fall, 1982, and Summer, 1983. Small landslide areas on the fan level cut slope were repaired, the fan level bench was re-graded, a berm was constructed on the outside edge of the bench, and the auxiliary ditch was constructed during late Fall, 1982. The drainage reconstruction, as well as the addition of the auxiliary ditch were recommended in the Phase II Stability Analysis studies by Geo-Hydro Consulting, Inc., and Merrick and Company (see Volume 6). Designs by the applicant's engineers for the landslide repair and auxiliary ditch construction may be seen in the Diversion Appendix in Volume 8A. Mine Benches and Access Roads The surface facilities as described above are built upon a series of benches at various elevations. Exact elevations can be found in tl~e text and on Maps 9A-2 through D and Map 6A-6. The benches were excavated in 1975 and 1976. With the site drainage plan, these benches meet the performance standards ofSub-chapter B and Sub-chapter K of 30 CFR. Map 6A-6 shows a plan view and across-section of the benches as titey~exist and the original ground line. No modification to these benches or roads is anticipated during the life of the facility. For a description of final reclamation and abandonment plans see Sections 2.05.4 and 2.06.5. See also post-mining (and use in Section 2.05.5. In 1982, Geo-Hydro Consulting, Inc, was retained to complete Phase 111 of a stability analysis, preparing the designs of the East Mine's final reclaimed configuration. These designs were approved in the existing permit and may be seen in the Final Abandonment Appendix (see Maps 6A-6, 6A-7, and 6A-SA through M) in Volume 6A. See Section 2.05.3(3)(6) and Maps 8A-8 for discussion of the existing mine facilities. The existing structures at the East Mine comply with 4.01, .02, .03, .04, .05, .17 and .18. Monitoring data to show conformatrce with the above performance standards are available for inspection at the mine office, • (ii) Not applicable. - Jx - 2198 TR-28/,P/v-o3 ! Z~/Q/9 9