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Peabody Sage Creek Mine <br />Pond 002 System <br />HYDROLOGIC INPUT PARAMETERS <br />Area: <br />1.4 <br />Curve Number: <br />SEDCAD 4 <br />WATERSHED ID <br />Structure 2 - SWS1 <br />Cha nnel PM -6b <br />M r LJMULUUIU CURVE AREA <br />WATERSHED TYPE GROUND COVER SOIL GROUP NUMBER (acres <br />Reclaim >3 years Good ( >70 %) g <br />62 1.40 <br />Total <br />1.4 <br />CURVE NUMBER 62 <br />Peabody Sage Creek Mine curve number (CN) values are based on CN values previously approved by CDRMS for the <br />Seneca If 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), <br />Soil Conservation Service, 1986. <br />Watershed Area: <br />StDCAD4 <br />WATERSHED ID <br />Structure 2 - SWS1 <br />Channel PM -6b <br />1.4 <br />edimentology: k Factor and Control Factor <br />WATERSiu: E COVER <br />Recla Good ( >70 %) <br />tal <br />rUMULUU IC <br />k <br />CONTROL <br />ARE <br />SOIL GROUP <br />FACTOR <br />FACTOR <br />(acr6 <br />B. <br />0.24 <br />0.043 <br />1.4 <br />1.4 <br />0.24 0.043 <br />The soil erodibility factor, "k- Factor", values were determined based on Seneca II soil survey information (see Tab 9, <br />Exhibit 9 -1, Soil Type and Sampling Locations, and Attachment 9 -6 of the Seneca II Mine PAP) as presented in Soils of <br />Colorado, Loss Factors and Erodibility, Soil Conservation Service, 1983, <br />The Control Factor values were 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. <br />The values are based on 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 <br />Loss Equation (RUSLE) . Agricultural Handbook 703. U.S. Department of Agriculture. <br />TRO1 -10 <br />20.5.3 -E2 -A 1.74 <br />12/10 <br />