2025-02-10_PERMIT FILE - M2024056 (2)

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14. The applicant proposes a 100 foot setback from the South Platte River on the north end of Phase 5. For protection of the riverbank,please review the attached, "Floodplain Protection Standards for Sand and Gravel Pits Adjacent to Rivers and Perennial Streams". This Guidance document is based on the MHFD Guidelines. Note that in the scenario where no pitside bank or riverbank protection is provided, the standard setback from the river or stream is 400 feet. Based on Table I-Standard Setbacks on Page 3 in the Guidance, the minimum setback from the river is 150 feet which requires stabilization of the riverbank and pitside banks. Please update the Mining and Reclamation Plans and maps to describe the stabilization structures that will be installed on the north side of mining Phases 3 and 5. Resubmit the maps and provide detailed designs of proposed structures (e.g., riprap, grouted boulders, side channel spillways) to be installed on pitside banks and riverbanks to control water erosion. The maps and text have been updated to reflect the standards in this guidance document. The 150-foot setback has been applied to the eastern-most pit, while the previously proposed inflow/outflow structure meets the standards for pit-side and bank-side protection. All other mining has been adjusted to maintain the 400-foot minimum setback that requires no armoring. Please refer to the updated Map C-2 and Exhibits for these changes in the mining plan. Exhibit H—Wildlife Information(Rule 6.4.8): 15. The applicant must address the comments of the Colorado Parks and Wildlife Division (CPW), which are enclosed with this review letter. Each of the comments must be directly addressed in your response letter, and, as applicable, comments must also be addressed by revising Exhibit H. These comments and recommendations are addressed after the DRMS adequacy items. Exhibit H has been updated to reflect any commitments made in response to the CPW comments. 16. During the pre-operation inspection, the Division observed prairie dogs in the permit area. Please address timing considerations related to burrowing owls and update the discussion in Exhibit Has necessary. A discussion on the prairie dog presence and burrowing owl considerations have been added to the revised Exhibit H. Exhibit M—Other Permits and Licenses (Rule 6.4.13): 17. Please update the list of permits to include the City of Evans Special Use Permit. This change has been made in the revised Exhibit M. Exhibit R—Proof of Filing with County Clerk and Recorder(Rule 6.4.18): Evans Mining Resource January 2024 5 Lewicki&Associates