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C ~ the vegetation cover <br />P ~ erosion practice <br />The factors for the equation were obtained from the book Soil <br />Erosion by RirRby ~ Morgan, 1980, data in the original lower <br />waste permit report and from projected slopes as shown on the <br />various phase diagrams. The sediment yield for each phase, the <br />sediment yields for the vegetated areas, the sediment yield for <br />the unvegetated slopes, the expected maximum sediment level for <br />each phase, the 508 sediment level for each phase, the maximum <br />sediment level allowed for adequate storage for the 10-year, 24- <br />hour storm without discharge, and the maximum water elevation <br />obtained for each phase is shown on Table 6.3. -.~nr ail phase <br />-sed~mew~-wi-11•t3et be rliowed to -risz higher t2ran the -maximu~ <br />owable sediment level without removal ~ It should be noted <br />that the pond will be pumped dry as soon as possible after the <br />storm event. The water will be treated as stated in Section 6.4 <br />of this report. In no case will the water or sediment level be <br />allowed to remain above the maximum allowable sediment elevation <br />shown on Table 6.3 for any long duration period of time since <br />water or sediment levels above the maximum allowable sediment <br />elevation may result in discharge from a 10-year, 24-hour storm. <br />elevations for both the sediment and water levels will be <br />itored with the use of a staff gauge placed in the pond. <br />Elevations will be monitored by West Elk Coal on a routine basis. <br />This information will be periodically reviewed during the various <br />phases to verify the original design assumptions. <br />23 <br />