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DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866 -3567 <br />FAX: (303) 832 -8106 <br />To: Peter Hays <br />From: Tim Cazier, P.E. <br />Date: November 29, 2012 <br />Mined Land Reclamation <br />MEMORANDUM <br />STATE OF COLORADO <br />Re: Adequacy Review of Flood and Post Reclamation Revetment Protection <br />Analyses for Western Sugar Reclamation Land Development Project, Permit <br />No. M- 2010 -049 <br />COLORADO <br />D I V I S I O N O F <br />RECLAMATION <br />MINING <br />— &— <br />SAFETY <br />John W. Hickenlooper <br />Governor <br />Mike King <br />Executive Director <br />Loretta Pineda <br />Director <br />The Division of Reclamation, Mining and Safety (DRMS) engineering staff has reviewed both <br />the October 8, 2012 Flood Analysis prepared by Flow Technologies, LLC, and the November 9, <br />2012 riprap sizing analysis prepared by Varra Companies. <br />1. The Flood Analysis appears adequate. No action required. <br />2. The riprap sizing analysis appears adequate. No action required. <br />3. Floodway and Erosion Mitigation Map. The map only presents the areal extent of the <br />proposed riprap. In order to fully understand and evaluate the riprap protection proposed, <br />the DRMS requires sections perpendicular and parallel to the flow directions in the Tract <br />C and D weirs. Please provide sections that meet the following specifications: <br />a. Riprap layer and bedding /granular filter layer thicknesses, <br />b. Elevation of top of riprap for each weir, <br />c. Profiles in the direction of flow showing how the riprap and bedding layers tie <br />into the proposed reclamation topography (above and/or below water level). <br />d. Permanent pool water levels, and <br />e. Section(s) perpendicular to the direction of flow showing how the riprap and <br />bedding layers tie into the proposed reclamation topography. <br />If either you or the applicants have any questions regarding the comments above, please call me <br />at (303) 866 -3567, extension 8169. <br />Office of Office of <br />Denver • Grand Junction • Durango Active and Inactive Mines <br />