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t <br />1 <br />The second step in the use of this approach would be to Finish the <br />filling after the ice melts. After the ice melts there would undoubtedly be <br />some settling. This Finish work might actually produce a better bed for <br />the water course. When the ice slowly melts the rocks and fines sh~~uld <br />' move about and establish a well compacted layer. When final filling and <br />grading is done the integrity of the bed should be capable of withstanding <br />erosion much better than a single step process. <br />' Another alternative for use during the drainage period would be the <br />installation of a Silt fence at the location where the water exits the p~~nd. <br />This probably would be far more effective than a gravel Filter layer. <br />' Furthermore, the silt fence, although much more expensive, would need to <br />be small and only In place for a short period. <br />' On November 20, 1989, a discussion was held with Fa.t Nelson of the <br />Water Quality Control Division of the Colorado Department of Health <br />regarding the need for a discharge permit to release the water from the <br />' blockage. Ms. Nelson indicated that if provisions are taken to a~~oid <br />serious amounts of siltation in the drainage a discharge permit would not <br />be needed. But iP heavy flows oP silt laden water occur then a discho~rge <br />permit would be needed. Because our work will be done in such a manner <br />' as to avoid heavy silt flows and to control sediment by any number of <br /> possible methods then it is our opinion a discharge permit will not be <br /> required. <br />' On November 20, 1989, a conversation was held with Anita Culp of the <br /> U.S. Army Corps oP Engineers, Pueblo office, regarding the need fora 404 <br /> permit to backflll the pond produced by the slide and for the sediment <br />' basin. Without further information, Ms. Culp was unable to make a <br /> determination whether a permit would be needed or not. Therefore, we _._ <br /> will be sending a package of information similar to the materials included <br /> in the Corrective Action Plan for review by the Corps of Engineers. If a <br />' permit is required for one or the other or both projects then the perivits <br /> will be obtained prior to implementing the work. It 1s possible all the <br /> work could be done under the Nationwide Permit Por the Black Canyon <br />' area. Ms. Culp is familiar with the situation through discussions ~Aith <br /> other parties, but is not Familiar with the details of the site or whether a <br /> 404 permit would In fact be needed. <br />' <br /> ITEM N0. 13 RESPONSE: Regarding a channel in the inundation area, the <br /> initial ththought was that none would be provided during construction and a <br /> natural channel alignment would be established by the runoff. The <br />' configuration has been further considered and the Operator will ir#ogimit <br /> to 'the following relative to establishment of a new water course. The <br /> material to be used for fill is relatively large, non-eroding rocks at the <br />' toe of the Area 1 disturbance. A pilot channel of this materiallle' wide <br /> with 3:1 sides would be developed in a "meander" configuration as opposed <br /> to a "straight" alignment. Plant growth medium and revegetation w~~uld <br /> not be placed within this corridor. This corridor resembles the existing <br /> natural unvegetated drainage channel at the bottom the canyon. The <br /> <br />s <br /> <br />