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iii iiiiiiiiniiiiii <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman SI., Room 215 <br />Denver, CO 80203 <br />Phone: 13031 866-3567 <br />FA%:13031832-8106 <br />August 4, 1993 <br />James A. I{iger <br />Senior Environmental Specialist <br />Colowyo Coal Company <br />5731 State Highway 13 <br />Meeker, CO 81641 <br />RE: Colowyo Mine, Permit C-81-019 Post-Mining Topography Changes <br />(Technical Revision No. 22). <br />Dear Mr. Kiger: <br />OF'COrO <br />1~~ 4 <br />Fs <br />~~ <br />.~ <br />Roy Romer <br />Governor <br />Michael B. Long <br />Division Direclnr <br />The Division has reviewed Colowyo's proposed revision of post-mining contours (TR-22). <br />As we have already discussed in phone conversations only a few items need further detail. <br />1. The longitudinal profile change in Gulch A is purported to be a drafting error <br />(Drawing 33). Please supply the Division a corrected map that does not indicate <br />reconfiguration of the undisturbed portion of Gulch A. <br />2. The Hydrologist reviewing this revision voiced concern over the lack of channel <br />designs for the proposed "West Tributary to Streeter" channel. All such channels <br />must be designed, using predicted peak flows, flow velocities, channel cross-sectional <br />configuration, and rip-rap designs as needed. These designs need to be submitted <br />prior to revision approval. <br />Please call if you need to discuss these items further. <br />Sincerely, <br />~. v° <br />J et H. Binns <br />Rec amation Specialist <br />m:\coal~jhb\C81019\TR22.ar <br />