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iii iiiiiiiiniii iii <br />999 <br />R~~~%~~- <br />Nov 1 81989 <br />November 17, 1999 <br />Steve S. Shuey, Environmental Protection Specialist <br />Division of Minerals & Geology <br />Durango Field Office <br />484 Turner Drive, Bldg F, Suite 101 <br />Durango, CO 81301 <br />Dear Mr. Shuey: <br />O~ <br />,,,,.~bn c ~ FreM <br />Miners 0I/l~ <br />6 ~~~ <br />In the on-going pursuit to improve stream channel stability for in-stream mining <br />operations, a series of cross sections and profiles are being established to measure <br />bedload and channel downcutting. This initial data will be obtained this fall and measured <br />again annually following spring runoff. In an effort to roughly determine approximate <br />bedload moved in the channel during runoff several calculations were performed relating <br />particle size and flow. These equations developed by Einstein, Larson (et. al.), and others <br />have estimated the bedload at 10,000 cubic yards per year. Again these are very rough <br />calculations and will be verified annually with actual channel measurements. <br />If I can be of any further assistance relating to the mining, monitoring, or reclamation <br />aspects of this application, please contact me at your earliest convenience. <br />Sincerely, <br />Jaffory Crane <br />Fluvial Geomorphologist/Civil Engineer <br />2917 L50 Lane, Hotchkiss, CO 81419.970-872-2433 • cranhckl@rmi.net <br />