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• <br />. <br />incorporate the recommendations for minimizing impacts during dewatering into their mining <br />and reclamation plan. Finally, in the event [hat the applicant wishes to dewater areas larger than <br />1-acre and/or deeper than 25 feet below the ground surface, the Division will require a <br />Codification to the permit which includes a hydrologic assessment of the potential impacts and <br />mitigation measures to be employed, as necessary. The Division will evaluate (at the time of <br />submittal) whether the permit modification should be processed as a technical revision or a <br />permit amendment. <br />9. Due to the close proximity of the S & H Mine to the South Platte River and the length of time <br />projected for mining and reclamation (100+ years), it is likely that disturbed areas within the <br />permit area will experience a significant flood event several or more times throughout the life of <br />mine. Accordingly, the Division requests that the applicant clarify the flood elevation and peak <br />flow velocity expected a "worst case" flooding event and specific measures that the operator will <br />implement to minimize the potential for any offsite impacts. Mitigation measures might include <br />mining dry pit slopes at a maximum of 1:1, installation of flood control spillways within the <br />reclaimed lakes, installation of drainage pipes within the internal berms separating pits and/or <br />reclaimed lakes, armoring internal berms separating pits and/or reclaimed lakes, or armoring <br />reclaimed pit slopes in close proximity to the South Platte River with erosion control riprap. <br />Please address. <br />6.4.13 EXHIBIT M -Other Permits & Licenses <br />12. In the event that a 404 or other permit is required by the Arn~y Corps of Engineers (either <br />now or in the future), the Division requests that the applicant review the terms and conditions of <br />the permit. If such terms and conditions require wetlands mitigation, wetlands construction, or <br />wetlands enhancement within the permit boundary for M-2000-158, then the plans and costs for <br />such mitigation, construction, or enhancement will need to be incorporated into the reclamation <br />plan. This may be accomplished via a technical revision to the mining and reclamation permit. <br />Please comment. <br />