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KENNECOTT ENERGY CORPORATION <br />COLOWYO MINE <br />Streeter Watershed SEDCAD Model Input <br />Structure 6, Subwatershed I <br />Disturbance* <br />Topsoil & Seeded: <br />0 acres <br />1-2 Year Reclamation: <br />0 acres <br />3+ Year Reclamation: <br />16.37 acres <br />Undisturbed- <br />11.13 acres <br />Total Subwatershed Area: <br />27.5 acres <br />Hydrology: <br />Time of Concentration: <br />Elevation Length <br />Description <br />13 70 <br />Upland <br />125 412 <br />Grassed Waterway <br />250 864 <br />Diversion <br />Curve Number., 52 <br />Sediment* <br />• Rainfall Factor., 19 <br />Soil Erodibility Factor., 0.28 <br />Length -Slope Factor. <br />Elevation Length Slope <br />125 190 65.8% <br />150 500 30.0% <br />200 440 45.5% <br />.7 <br />Average <br />158 377 47.1% <br />Control Factor 0.03 <br />Practice Factor: 0.59 <br />Exh. 7 -SP -18 <br />Revision Date: 2/1/06 <br />Revision No.: TR -63 <br />