2025-06-30_PERMIT FILE - C1981019

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RULE 2 PERMITS Rule 2 Permits 2.04-38 Revision Date: 11/1/21 Revision No.: TR-150 The upper reaches of Prospects Gulch will be reconstructed in its approximate original location. The reconstructed channel will tie into the existing drainage at the disturbance limit and route water to a sediment pond at the base of Prospects Gulch. The final pit for the East Pit multiple seam operation will be adjacent to an un-named tributary to Goodspring Creek. The upper reaches, above the disturbance limits, of this un-named tributary will be reconstructed slightly south of the original location. This ditch will drain the Final East Pit area to a diversion that routes the drainage to the proposed Prospect Pond. In the West Pit area the tributary to Taylor Creek will be reconstructed along the length of the disturbance. Also in the West Pit area, three additional ditches will be constructed including the West Pit Fill Ditch, the Gulch B Ditch, and the Final West Pit Ditch. other diversion ditches, built on existing natural ground, to collect and route runoff from disturbed areas include the North Prospects Ditch, the South Collection Ditch, Section 16 West Ditch and Section 16 North Ditch. It should be noted that once the West Pit is developed the Section 16 West Ditch, the Section 16 North Ditch, and the Temporary Section 16 Pond will no longer be needed. See Map 19 for the locations of all drainages. The stream channels of Wilson, Taylor and Goodspring Creek will be undisturbed. Although there will be some changes in the areas tributary to the intermittent and ephemeral drainages in the vicinity of the mine, there will be no, change in the major drainage areas tributary to Goodspring Creek, Taylor Creek or Wilson Creek. Premining and postmining tributary areas for the various drainage basins are summarized as follows: Estimated Tributary Areas Acres Basin Premining Postmining Differences Goodspring Creek 25,600 25,600 0 Tributaries to Goodspring Creek: Streeter Gulch 1,424 1,186 -238 Gulch “A” 419 648 +229 Prospect Gulch and 905 881 - 24 Other Drainages Taylor Creek 3,977 3,977 0 Tributaries to Taylor Creek: Taylor tributary 1,379 1,403 + 24 All of the mining area drainages have been designed in accordance with the Colorado Mined Land Reclamation Board's regulations. Particular attention has been given to the design of the permanent channels draining Streeter Fill, the Gulch A mine area and the unnamed tributary to Taylor Creek. When designing channels constructed in erodible material, several criteria must be met. The channel must have adequate capacity to carry the maximum flow (in this case the runoff from the 100-year, 24-hour precipitation event) and it must have adequate stability to resist the erosive action of flowing water under all flow conditions. There are two main design procedures for insuring the stability of erodible channels. One procedure is based on a limiting velocity concept