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• <br />KENNECOTT ENERGY CORPORATION <br />COLOWYO MINE <br />Streeter Watershed SEDCAD Model Input <br />Structure 2, Subwatershed 2 <br />Disturbance* <br />Topsoil & Seeded: 85.63 acres <br />1-2 Year Reclamation: 89.48 acres <br />3+ Year Reclamation: 206.46 acres <br />Undisturbed: 0 acres <br />Total Subwatershed Area: 381.57 acres <br />Hydrology: <br />Time of Concentration, <br />Elevation Length Description <br />38 367 Upland <br />75 2313 Grassed Channel <br />125 4498 Diversion <br />Curve Number 64 <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 />175 <br />1300 <br />115% <br />80 <br />960 <br />8.30/a <br />120 <br />950 <br />12.6% <br />130 <br />1100 <br />11.8% <br />150 <br />1960 <br />7.7% <br />Average <br />131 <br />1254 <br />10.8% <br />• <br />Control Factor. 0.20 <br />Practice Factor., 0.38 <br />Exh. 7 -SP -11 <br />. ......... <br />Revision Date: 2/1/06 <br />Revision No.: TR -63 <br />