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iii iiiiiiiiiiiiiiii <br />C c~RUs <br />~ Yampa Valley <br />June 24, 1991 <br />Tony Waldron <br />Reclamation Specialist <br />Colorado Mined Land Reclamation Division <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203-2273 <br />Dear Mr. Waldron: <br />Cyprus Yampa Valley Coal Corporation <br />29567 Routt County Road #27 <br />Oak Creek, Colorado 60467 <br />303-879-3600 <br />JUN 2 6 1991 <br />Mined Land <br />Reclamation Division <br />RE: Area 51 Temporary Diversion Ditch; Mines 1. 2, and Eckman Park. Permit <br />C-81-071 <br />Enclosed for your reference please find the SEDCAD sizing run for the above referenced <br />diversion. This temporary diversion was cut in response to some minor downslope erosion in <br />Area 51, as allowed in the current permit. The enclosed sizing is for the 5 year/24 hour rainfall <br />event, which is extremely conservative given that the 2 year/24 hour event meets the sizing <br />requirements of the current regulations. Please note that the enclosed sizing does not include <br />the required 0.3 feet of freeboard. <br />The current diversion in place exceeds the ditch sizing requirements with freeboard included. <br />Should you have any questions or concerns, please contact me at your convenience. <br />Sincerely, <br />Marcus A. Middleton <br />Environmental Specialist <br />MAM:dg <br />