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- ~ - III IIIlIIIIIIIIIIII i s °°~ STATE, Or COLOI~UU i~ ~ ,~ Roy Romer, Gove DEPARTMENT OF NATURAL RESOURCES MINED LAND RECLAMATION DIVISION FRED R. BANTA, Director DATE: November 17, 1988 T0: Candy Thompson/~ FROP1: Tim Y.i ng RE: Waste Pile Diversion Designs For our team, six mines have waste piles. Therefore, waste pile diversions are required. They are listed below with comments, and book and page references. 7 C-80-007 - 11t. Gunnison The lower waste pile diversion is calculated using a 10 year, 24 hour event, as stated on page Z1 of Appendix C-2, within Volume 12 of said pe rmit. This pile is in the process of being constructed. The upper waste pile diversion is designed for a 10 year, 24 hour event, as stated on page 42 of Section 3, within Volume 11 of said permit. Please note that this pile has been permitted, but has not been constructed as of this memo. C-83-038 - Orchard Valley The East Ridge and the West Ridge waste pile diversions are calcula±ed using a 100 year, 24 hour event, as stated on various panes of the Stability Analysis section of Volume 6A of said permit. C-81-034 - Red Ca The main site diversion is calculated using a 100 Year, 24 hour event, as stated on page 128a, Section 2.05.4(2)(c) of Volume 1 of said permit. However, this diversion is not only for the wastepile. It runs entirely through the site, from North to South, and is located below the waste pile. There are two terrace ditches that run through the cover on the wastepile, but these are not considered the main diversions. Also, there is no undisturbed diversion at the top of the waste pile. '-', C-81-047 - Blue Ribbon The Cline bench diversion, labeled "68C", is calculated using a 100 year, 24 _ hour event, as stated on page C-6 of Appendix C of said permit. This diversion also drains the undisturbed drainage also labeled "B&C". 215 Centennial Building, 1313 Sherman Street Denver, Colorado 802G3-2273 Tel. (303) 856-3567