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Peabody Sage Creek Mine <br />Pond 002 System <br />HYDROLOGIC INPUT PARAMETERS <br />'Watershed Area: <br />31.6 <br />Curve Number: <br />WATERSHED TYPE <br />Reclaim >3 years <br />Total <br />CURVE NUMBER <br />62 <br />Peabody Sage Creek Mine curve number (CN) values are based on CN values previously approved by CDRMS for the <br />Seneca II Mine, Permit C -80 -003. The CN values are presented in the Seneca II Mine PAP in Appendix 7 -12, Postiming <br />Drainage Control. Values are adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55 (TR -55), Soil <br />Conservation Service, 1986. <br />SEDCAD4 <br />WATERSHED ID <br />Structure 11 - SWS1 <br />Vatershed Area: Channel PM -16 <br />31.6 <br />edimentology: k Factor and Control Factor <br />VEGETATION HYDROLOGIC k CONTROL AREA <br />WATERSHED TYPE COVER SOIL GROUP FACTOR FACTOR (acres <br />Reclaimed Good ( >70 %) B 0.24 0.042 31.63 <br />Total <br />31.6 <br />0.24 0.042 <br />The soil erodibility factor, "k- Factor', values are based on Seneca II soil survey information (see Tab 9, Exhibit 9 -1, Soil Type <br />and Sampling Locations, and Attachment 9 -6 of the Seneca II Mine PAP) as presented in Soils of Colorado, Loss Factors <br />and Erodibility, Soil Conservation Service, 1983. <br />The Control Factor values are adapted from Seneca Coal Company mine permit application packages. They are <br />representative of regional conditions and previously approved by CDRMS in the Seneca II Mine PAP, Permit C -80 -003. The <br />values are adapted from Renard, et al. (Renard, K.G., Foster, G.R., Weesies, G.A., McCool, D.K., and D.C. Yoder, <br />coordinators, 1996. Predicting Soil Erosion by Water. A Guide to Converation Planning with the Revised Universal Soil Loss <br />Equation (RUSLE). Agricultural Handbook 703. U.S. Department of Agriculture. <br />TRO1 -10 <br />SEDCAD4 <br />WATERSHED ID <br />Structure 11 - SWS1 <br />Channel PM -16 <br />HYDROLOGIC <br />GROUND COVER SOIL GROUP <br />Good ( >70 %) B <br />CURVE AREA <br />NUMBER (acres <br />62 31.63 <br />31.6 <br />20.5.3- E2 -A1.83 <br />12/10 <br />