2001-04-23_REVISION - M2000158 (4)

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located along the western and southern edge of the proposed lakes. This slope protection (riprap) is intended to be installed during mine operations only. The riprap protection would be installed during the mining operation and it is intended that no more than 500 feet of completed mined slope edge be allowed to remain unprotected at any one time. Once the mine operations are complete and mitigation procedures begin, it is intended for this riprap protection to remain in place as indicated on the enclosed cross-section titled "Lake Slope Protection." 3. The cost of this mitigation is estimated below. It is estimated that the riverbank armor will utilize approximately six tons of material per linear feet. We estimate the cost at $3 per Yon or $18 per lineaz foot. Again, this armoring is optional but if the entire length were armored we estimated 20,000 linear feet or $360,000. Likewise the lake slope protection azea is estimated to require about 4 %: tons of material per lineaz foot. At $3 per ton this would cost $13.50 per lineaz foot. We estimate currently that there is 22,000 linear feet of protection required for a cost of $297,000. Both of these are total maximum project costs. 4. Describe when during the mining and reclamation sequence that this specified mitigation procedures will be employed: As previously described, the riverbank armoring should be applied, if the applicant desires to maintain the current location of the river and/or when mining operations or other requirements of the applicant require that the applicant armor the river. The lake slope protection will occur during mining operations. Once the mining operations have reached the point of the extremity of the lake, in the azea so highlighted on the enclosed map, these azeas will be armored at that time. No more than 500 linear feet of bank will remain unprotected for a continuous operation. If mining operations cease along the bank edge this protection should be placed within ninety days of cessation of mining operations along the edge regardless of the length. Please do not hesitate to contact me if you need further information. Sincerely, PICKETi ENGINEERING, INC. /'~^~ Kris- i/cke~tt, P-E- rPresiaent KAP/jz cc: Clerk to the Board, Board of County Commissioners Weld County Planning Platte Sand and Cnavel, LLC Steve O'Brian, Environment, Inc.