2019-03-18_PERMIT FILE - M2018016 (9)

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See the attached copy of the CDOT access permit. 11. On Page D-1, the Applicant states the CDOT right-of-way can be seen on Map C-1. The location of the right-of-way is not obvious due to the complex parcel ownership for the area. Please update the Exhibit C-1 map to clearly indicate the CDOT right-of-way. The CDOT right-of-way has been highlighted on Map C-1. 12. On Page D-1, the Applicant states no portion of the mining will enter the West Fork of Clear Creek and a barrier of in place native material will be maintained until the very end of the operation to prevent stormwater from discharging from the operation to the creek. Please describe the method of mining to be employed to remove the native material barrier as the mine elevation is lowered and at the end of the operation pursuant to Rule 6.4.4(a). See the revised page D-1. 13. On Page D-1, the Applicant states no portion of the mining will enter the West Fork of Clear Creek and a barrier of in place native material will be maintained until the very end of the operation to prevent stormwater from discharging from the operation to the creek. This way the hydrologic balance of the West Fork of Clear Creek is protected. Please describe how the hydrologic balance of the West Fork of Clear Creek will be protected following the removal of the native material barrier. The barrier will not be removed until revegetation has succeeded on the disturbed areas. With the barrier removed, the hydrologic conditions of the site will be the same as the pre-mine condition: rangeland meadow draining to the West Fork of Clear Creek. 14. On Page D-2, the Applicant states the crest of each cut will be knocked down with a dozer to create the final 3H.-1 V reclamation slope. Please describe how the mining excavation will be conducted including the perimeter slope configuration prior to construction of the final reclamation slope. See the revised Exhibit D. 15. Please provide a typical mining excavation cross-section(s)for the perimeter and active highwall configurations. See Figure D-1 in the revised Exhibit D. The active highwall will be maintained until it is at the midpoint of the final reclamation slope, and then it will be knocked down to create the final slope for topsoil placement. 16. On Page D-2, the Applicant states topsoil will be stripped in advance of mining and placed in a windrow ahead of the mining area. Please provide the anticipated configuration and volume of the topsoil windrows. A typical topsoil windrow can be seen on Map C-2A. The volume will vary as mining progresses throughout the site, since its length will change. It is expected to be between 7400 and 23,000 CY in size. It will be seeded each time it is built to print loss of soil to erosion. DMR Mine Ah1-01 4 (.irk Le ck.and 1ssocuto,PI t