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Peabody Sage Creek Mine <br />Pond 002 System <br />HYDROLOGIC INPUT PARAMETERS <br />SEDCAD4 <br />WATERSHED ID <br />Structure 1 - SWS1 <br />Channel PM -6a <br />watershed Area: <br />16.3 <br />;urve Number: <br />WATERSHED TYPE <br />Reclaim >3 years <br />Total <br />HYDROLOGIC CURVE AREA <br />GROUND COVER SOIL GROUP NUMBER acres <br />Good ( >70 %) 1 B 62 16.30 <br />16.3 <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 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), <br />Soil Conservation Service, 1986. <br />StUGAD4 <br />E 7 WATERSHED ID <br />Structure 1 - SWS1 <br />Channel PM -6a <br />ed Area: <br />16.3 <br />imentology: k Factor and Control Factor <br />VEGETATION HYDROLOGIC k CONTROL AREA <br />WAT 7nt COVER SOIL GROUP FACTOR FACTOR acres <br />Good ( >70 %) g <br />0.24 0.043 16.3 <br />16.3 <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 Emdibility, 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 CORMS 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 20.5.3- E2 -A1.73 12/10 <br />