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• When the sedimentation ponds and temporary impoundments are <br />removed, the area will be regraded to conform with surrounding <br />topography, topsoiled and seeded as required for final reclamation, <br />or documentation provided to retain the impoundments as permanent <br />structures. <br />All sedimentation ponds and temporary impoundments are <br />planned to be 10 ft high or less from the bottom of the channel to <br />the bottom of the emergency spillway and will impound less than 20 <br />acre-ft of sediment and/or water; therefore, required approval by <br />the State Engineer in accordance with CRS 37-87-105 and the Mine <br />Safety and Health Administration 30 CFR 77.216 design criteria is <br />not applicable. <br />Wyoming Fuel Company expects the plan herein submitted to be <br />complete; however, if changes are required in the future MLRB will <br />be notified of the changes in writing and Wyoming Fuel Company will <br />• wait for review and written approval before implementing these <br />changes. <br />All sedimentation and impoundment dams will be constructed <br />5 percent over the design height to allow for settlement. <br />All supporting calculations used in designing Sedimentation <br />Pond #1, #2, #3, #4, Temporary Impoundment #1 and diversion ditches <br />are found in Appendix Q. <br />All sedimentation ponds will be cleaned out when sediment <br />accumulates to sixty percent of the design sediment volume. <br />(a)(ii) Sedimentation Ponds #1, #2, and #3 were built by <br />Wyoming Fuel as approved by the Colorado MLRB during the fall of <br />1979 and 1980 (see Appendix Q). Sedimentation Pond #4 and Impound- <br />h..ai . <br />ment #1 are planned for construction during the summer of 1981.-''°^"` <br />• -37- Revised 11/29/94 <br />