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-2- • PROPOSED PLAN: To avoid continual siltation of the Taylor Creek Pond, Colowyo proposes to construct a temporary diversion of Taylor Creek around the pond. Included in the initial diversion structure will be an outlet pipe that will allow the pond to be filled by Taylor Creek if the water is acceptable. As we discussed on September 12, the diversion will be designed to safely pass the runoff from a 10 year, 24 hour precipitation event since it is temporary. After mining operations are complete, the diversion and associated structures will be removed and the area reclaimed in conjunction with the haul road reclamation and in accordance with the plan submitted in the Colowyo Permit C-019-81 for the loadout area. The Taylor Pond will remain intact for stack watering purposes. During construction of the diversion structures, all available top- soil will be removed and stockpiled in accordance with the Colowyo Permit C-019-81. Construction will consist of a diversion dam on Taylor Creek, a concrete diversion structure and associated headgate, a diversion ditch that ties in with the spillway of the Taylor Pond, and a low level outlet for the Taylor Pond. The locations and designs of the structures are shown on the enclosed map, Proposed Taylor Creek Diversion System and associated figures and calculations. During operation of the structures, Ovate;- will be diverted around the Taylor Pond, unless it is acceptable for use in the water system, in which case it will be allowed to flow into the Pond. When sediment buildup in the pond creates operational problems for the water system, the pond will be dredged. The proposed low level outlet will be used to drain the pond prior to dredging. If the dredged material is acceptable for use as topsoil, it will be stockpiled. The dredging operation will require the construction and maintenance of a pad for a small mobile drag- line to operate on. The dragline will stockpile the dredged material alongside the pond or load the material into trucks to haul to a stockpile (if it is acceptable as topsoil) or to a mine dump. A Proposed Public Notice is attached for your review. We would appreciate your expeditious review of this request, as we would like to begin construction this Fall, weather permitting. Thank you for your consideration, and if you have any questions, please call me. Sincerely, COLOWYO COAL CO~~IPANY ~i RicG~ hard Atkinson Chief Reclamation Engineer RGA/yml Attachments cc: L.B. Gray Central Files