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Seneca Coal Company will monitor the sediment storage capacity to ensure enough capacity O <br />is evailsbl e. The estimated design storm sediment volume is based on a worst-case <br />disturbance in the watershed. This worst ease will not occur until eppr oximately 1998. <br />Therefore the constructed sediment storage capacity should be adequate for et least three <br />years. <br />Particle Size Distributions. The particle size distribution for this setlimentation pond <br />was based on sieve and hydrometer analysis of various soil types in the Yoast permit area. <br />This distribution is representative of the wet er shed for Pond 010 and based on a weighted <br />average. The specific gravity and the submerged bulk specific gravity of the soil ere <br />estimated to be 2.50 end 1.17, respectively. <br />Particle Size Distribution(s) <br />Yeighted Average <br />NAT1 SPL2 <br />Sixe (nun) X Finer % Finer <br />12.7000 100.00 100 <br />11.2000 96.00 97 <br />2.0000 86.00 91 <br />0000 83 <br />1 <br />00 87 <br />. <br />. <br />0.5000 81.00 84 <br />0.2500 80.00 82 <br />0.1060 75.00 79 <br />0.0450 41.00 56 <br />0.0200 20.00 40 <br />0.0100 12.00 31 <br />0.0050 8.00 24 <br />0.0020 7.00 17 <br />0.0010 4.00 14 ~, <br />0.0001 0.00 0 <br />Length-Slone Factor (LS). The lengthslope is described as the typical length-slope for <br />the subwetershed and the distance from the point of origin of overland flow to a point <br />where the slope decreases such that significant deposition occurs or until the flow enters <br />e defined channel. The length-slope for watersheds above Pond 010 was determined to be <br />between 100 and 400 feet, end the average slope was determined <br />percent. Following is McKOOI et al's. (1987) LS equation: to be approximately 15.0 <br />13-3-6 Revised 03/01/95 <br />