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KENNECOTT ENERGY CORPORATION <br />COLOWYO MINE <br />Streeter Watershed SEDCAD Model Input <br />Structure 4, Subwatershed 2 <br />Rainfall Factor. <br />Disturbance: <br />19 <br />Topsoil & Seeded: <br />0 acres <br />1-2 Year Reclamation: <br />0 acres <br />3+ Year Reclamation: <br />110.93 acres <br />Undisturbed: <br />0 acres <br />Total Subwatershed Area: <br />110.93 acres <br />Hydrology: <br />16.7% <br />Time of Concentration: <br />930 <br />Elevation Length Description <br />10 275 <br />Upland <br />150 1564 <br />Diversion <br />100 2124 <br />Diversion <br />75 434 <br />Diversion <br />Curve Number., 56 <br />Sediment: <br />Rainfall Factor. <br />19 <br />Soil Erodibility Factor: <br />0.28 <br />Length -Slope Factor: <br />Elevation <br />Length <br />Slope <br />100 <br />600 <br />16.7% <br />50 <br />930 <br />5.4% <br />75 <br />700 <br />10.7% <br />Average <br />75 <br />743 <br />10.9% <br />Control Factor: <br />0.01 <br />Practice Factor. <br />0.38 <br />• <br />Exh. 7 -SP -15 <br />Revision Date: 2/1/06 <br />Revision No.: TR -63 <br />