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KENNECOTT ENERGY CORPORATION <br />COLOWYO MINE <br />01 QA -East Taylor 1Natershed SEDCAD Model Input <br />Structure 3, Subwatershed 1 {S3-SWS1} <br />Disturbance: <br />Topsoil & Seeded: 24.00 acres <br />1-2 Year Reclamation: 29.44 acres <br />3+ Year Reclamation: 50.51 acres <br />Undisturbed: 94.14 acres <br />Total Subwatershed Area; 19$A9 acres <br />Hydrology; <br />Time of Concentration: <br />Elevation Length Description <br />13 199 Upland <br />325 1436 Grassed Waterway <br />263 3931 Diversion <br />Curve Number: 56 <br />8edimen#: <br />Rain~alt Factor: 18 <br />• <br />Solt Erodibtlity Factor: 0.28 <br />Length-Slope Factor, <br />Elevation Length Slope <br />300 1300 23.1 <br />z5o laoo z5.o~° <br />22.5 1100 20,5% <br />225 950 23.7°!0 <br />Average <br />250 10$8 23.1°la <br />Control Factor: 0.14 <br />PraCtlGe Factor. 0.63 <br /> <br />Exh. 7-ET-11 Revision Date: 2/1/06 <br />Revision No.: TR-63 <br />