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• • III IIIIIIIIIIIIIIII <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmenl of Natural Resources <br />1313 Sherman SI., Room 215 `y <br /> <br />Denver, Colorado 80203 I <br />~~ <br /> <br />Phone: (3031 866-3567 II <br />FA%: 1303) 832-8106 <br /> DEPARTMENT OF <br /> NATURAL <br />August 3, 1995 RESOURCES <br /> Roy Romer <br />Mr. Allen Weaver c^vernor <br />Energy Fuels Coal, Inc. fames s E«nhead <br /> Executive Direcmr <br />Box 449 <br />P <br />O <br />. <br />. Michael B. Long <br />Florence, CO 81226 Division Direnor <br />Re: Southfield Mine (Permit No. C-81-014) <br />Technical Revision No. 21 - Loadout Drainage Control <br />Dear Mr. Weaver: <br />We have reviewed the Technical Revision No. 21 (TR-21) response materials received July 27, <br />1995. Ow remaining concerns and comments follow. We retain the number scheme used in ow <br />June I, 1995 adequacy letter. <br />1. through 11.) Responses accepted. <br />12.) Response accepted. Please be awaze, however, that the inlet riprap must be maintained, and <br />must function in good condition at all times to enswe compliance. <br />13.) Response accepted. <br />14.) Our previously stated concern remains. EFCI proposes a southeast ditch which will have a <br />maximum flow depth of 0.9 feet deep, and a total ditch depth of 1.2 feet. This limits <br />available headwater (total flow depth at culvert inlet) to 0.9 feet. Based upon the SEDCAD <br />culvert utility, assuming a total headwater depth of 0.9 feet, tallwater depth 0 feet (which is <br />not likely), n of 0.024 and entrance loss coefficient Ke of 0.9, the predicted 6.5 cubic feet <br />per second will not safely pass through either of the proposed culvert configurations. Please <br />revise the plan as needed. <br />15.) Response accepted. <br />Additional Concerns <br />l.) The material received July 17, 1995 include a revised page 206a (Ex. 19). This page does <br />not seem to fit with our binders which contain page 206R (November 1993) and 206Ra <br />(November 1993). Yow assistance is requested in resolving the possible page discrepancy. <br />