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KENNECOTT ENERGY CORPORATION <br />COLOWYO MINE <br />• <br />4'I OA -East Taylor Watershed SEDCAD Model Input <br />Struature~4, Subwatershed 1 {S4-SWS1~ <br />Olstur6ance: <br />Topsoil & Seeded: 0 acres <br />i-2 Year Reclamation: 0 acres <br />3+ Year Reclamation: 61..49 acres <br />Undisturbed: 48.48 acres <br />Total Subwatershed Area: '109.97 acres <br />Hydrology: <br />Time of Concentration: <br />Elevation Length Desctiption <br />15 281 Upland <br />178 828 Grassed Waterway <br />225 3075 Diversion <br />Curve Number: 52 <br />Sediment: <br />• Rainial! Factor.: 49 <br />Soil Erodibility Factor.• 0.28 <br />Length-Slope Factor: <br />Elevation Length Slope <br />250 970 25.$°to <br />150 7$0 19.2°l0 <br />150 1050 14.3°l0 <br />Average <br />183 933 19.8°l0 <br />Control Factor. tl.tl4 <br />Practice Factor: 0,61 <br />r~ <br />L_J <br />Exh. 7-ET-12 Revision Date: 2/1/06 <br />Revision No.: TR-63 <br />