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Mr. Gregg Squire 3 July 20, 1987 Colorado Mined Land Recl. Div. 1.3 acre-feet of water to a 2-acre livestock pond. (All proposed livestock ponds at Trapper will be under two acre-feet in size.) The remaining issues in the above item have been addressed in the summary of Mr. Jurgens comments as stated above. 2. Physical Controls The next major item of the revised plan involves various physical controls, singularly or in combination in the drainageway. The application of physical controls would be dependent upon the physical conditions of the drainage at the point of control and expected flow volume and velocity. For example, in very steep reaches with high flows, channel lining such as rip-rap may be required. In such instances, plans for the rip-rapped drainage sections would be forwarded to the Division for approval. If other types of physical con- trols such as rock check structures are appropriate, then these would be installed. Other types of suitable materials may also be installed. Such materials include straw bale check structures, various erosion control mats, brush, etc. For the 1987 construction season, we intend to treat all of east and west No-Name drainages, and Coyote drainage with various combinations of straw bale check structuces, rock check structures in steep segments, the applica- tions of landglass and other types of erosion control materials. The drainage channels will be re-shaped into an approximately parabolic shape, in cross sections. Also, a layer of topsoil at Least six inches deep will be Laid down in drainageways. Prior to application of physical controls, the reshaped drainageways will be seeded to a quickestablishing sterile biennial and our approved drainageway seed mix. Provided climatic conditions are suitable, the treatments will be completed by September 30th. The primary objective of the above practices is [o stabilize the reestablished drainageway until such time when perennial vegetation becomes established. 3. Monitoring and repair Any plan can only be effective if the applications and controls within a reestablished drainage are monitored for failed sections. In the past, Trapper has closely monitored drainagway stabilization practices throughout the summer seasons for failed sections. Where failures have occurred, we have made repairs. This practice will be continued to the extent practical. Trapper recognizes that stabilization of reestablished drainageways is an important step in the total reclamation process. The above proposed refine- ment of our existing plan represents an aggressive effort on our part toward good reclamation and supercedes Trapper's letter of May 7, 1987. However, the cont.