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Western Fuels -Utah, tnc. <br />Deserado Mine <br />• <br />P.O. 8OX 7589 <br />RANGELY, COLORADO 87648 <br />PHONE: (3031 675-8131 <br />March 30, 1983 ~~, ,, <br />Mr. Dan Matthews <br />Reclamation Specialist <br />Colorado Mined Land Reclamation <br />Division <br />1313 Sherman Street <br />Denver, CO 80203 <br />RE: Bonanza Power Plant <br />Deserado Mine <br />Sedimentation Ponds #1 & #2 <br />Analysis and Design Pursuant <br />to March 8, 1983, Minor <br />Revision Request - Temporary <br />Coal Stockpile <br />Mr. Matthews: <br />• Sediment Ponds #1 and #2 of the Temporary Coal Stockpile <br />were sized according to the same conceptual design and <br />analysis as those in Western Fuels' Permit Application. <br />The Universal Soil Loss Equation (LISLE) and the runoff <br />of a 10-year, 24-hour event were summed to attain the <br />total storage volume. <br />Sediment Volume (Acre-Feet) _ <br />Tons/Year X 2000 Lb/Ton <br />X 1 Year = 0.000574 X Tons/Y. <br />80 Lb/Ft3 X 43,560 Ft2/Acre <br />Tons/Year = 27.0 <br />Sediment Volume (Per Acre) = 0.0155 Acre-Feet <br />= 674 Ft3/Acre <br />10-Year, 24-Hour Rainfall = 1.8 Inches <br />Runoff = 0.9 Inches <br />Runoff/Acre - 1 Acre X .9 In. X 43,560 Ft2 X 1 Foot <br />Acre 12 Inches <br />= 3,267 Ft3/Acre <br /> <br />