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<br />26 <br />the roads, buildings, and coal stockpiles do not exist; therefore, <br />no impervious area vas assumed. <br />r <br /> <br />The average suspended sediment concentration for the 100-year design storm <br />is 2950 ppm. This is within the range of sediment concentrations found in un- <br />disturbed subwatersheds with similar geometry in both the Magpie Creek and <br />Newlin Creek watersheds. <br />~.J <br />