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III IIIIIIIIIIIII III <br />999 <br />DEPARTMENT OF NATURAL RESOURCES <br />David H. Getches, Executive Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Director <br />Richard D. Lamm <br />Governor <br />DATE: November 29, 1983 <br />T0: Susan Mowry <br />FROM: Jim Herro <br />RE: Pryor Mine - 'le No. C-031-81 <br />I have completed a review of American Fuels response to Stipulation No. <br />15 regarding stream channel reconstruction of the unnamed tributary. In <br />gene-al the designs and calculations are conservative. The only <br />exception is the roughness coeffecient used when determining peak flows <br />and 'low depths. Some of the roughness coeffecients used were low, <br />therefore, the channel velocities would be lower than calculated and the <br />flow depths would be greater than calculated. However, the channels are <br />still adequately designed despite this minor error. <br />I also reviewed the bonding calculation and believe the $9,700.00 <br />calculated to be adequate. Therefore, I recommend this stipulation <br />resp m se be approved. <br />/pjh <br />Doc. No. 7411 <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />