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°~llJ ~ ¢~ ~ i '"' ~ ~.~ ~ C ~T/h!\l~v la! ~C h._c1 ~ t~' r^ti. C~~ a "J II I III III I II IIII'II <br />Colorado Yampa Coal Company B°x 772,29 <br />Steamboat Springs, CO 80477 <br />A Subsidiary of Getty Coal Company (303) 879-3800 <br />February 2, 1983 <br />RECEIVED <br />Ms. Sandra Emrich FEB 071883 <br />Reclamation Specialist <br />Colorado Mined Land Reclamation Division M1NED LAND RECLAMATION <br />423 Centennial Building COIQ ~FDl• OF NATURAL RESO::RCES <br />1313 Sherman Street <br />Denver, CO 80203 <br />RE: Sediment Control Plan, Mines 1, 2 and Eckman Park <br />Dear Sandy: <br />You have expressed a need for documentation on the sediment storage <br />criteria used in the design and construction of Sedimentation Ponds K and ti at <br />Mine No. 2. Certification of construction was submitted to the Division on <br />November 5, 1982. The sediment storage criteria used in the design was 0.02 <br />acre-feet per acre of disturbance. <br />Sedimentation ponds are designed to contain and treat runoff and sediment <br />generated by the 10-yr, 24-hr precipitation event. Enclosed are calculations <br />showing the sediment yield from the 10-yr, 24-hr event, utilizing the Modified <br />Universal Soil Loss Equation. These calculations demonstrate that the sediment <br />storage volumes prescribed for Ponds K and M are adequate. <br />Please contact me with any questions on this matter. <br />Sincerely, <br />COLO~(/R~/Ap/CD~O YAMPA COAL COMPANY <br />Geoffrey P. Saunders <br />Staff Hydrologist <br />GPSJfc <br />cc: K. Crofts <br />B. Batker <br />E. Fidler <br />