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February 1999 Yoast :Nine " 1312 Drainage and Sediment Contro; Plan ~ 8 <br />Channels SEDCAD4 Results. The design results are summarized on Figure 13-12.3, Post Mining <br />Channel Designs. As shown on this figure, channel sections with shallow slopes or low flows will•be <br />grass-lined. However, channels with steep slopes and velocities exceeding 4 fps will be armored. The <br />Pader method for steep slopes was used to estimate rip rap size. $ased on our experience, the rock • <br />size estimated by Pader was a little loo aggressive. Therefore, we have doubles the rock size required <br />for design purposes. <br />7.0 TOPSOIL STOCKPILE SAE <br />A request for a small area exemption (SAE) has been included in this submittal to cover the planned <br />topsoil stockpiles at the Yoast mine. Runoff from the stockpiles will be controlled by constructing a <br />small containment berm immediately down-gradient of the piles. The SAE request is presented in <br />Appendix 13-12.4, Topsoil Stockpile SAE, of this Attachment. <br />8.0 REFERENCES <br />Barfield, Warner, & Haan (1981). Applied Hydrology and Sedimentology for Disturbed Areas. <br />Oklahoma <br />Technical Press, Stillwater, Oklahoma. <br />Nyenhuis, J. (Dec. 1997). Seneca II WSouth Expansion Soil Survey. <br />Renard, K.G., G.R. Foster, G.A. Weesies, D.K. McCool, and D.C. Yoder, coordinators (1996). <br />Predicting Soil Erosion by Water: A Guide to Conservation Planning with the Revised <br />Universal Soil Loss Equation (RUSLE). Agricultural Handbook No. 703. U.S. Department of <br />Agriculture. ~nal draft) <br />Schwab and Warner (1498); SEDCAD4 Design Manual and user's Guide. University of Kentucky, • <br />Biosystems and Agricultural Engineering Depanment. <br />Soil Conservation Service (1983). Soils of Colorado, Loss Factors and Erodibility Hydrologic Groupings. <br />Soil Conservation Service (1986). Urban Hydrology for Small Watersheds (7R-SSJ. <br />i <br />Revised 5/99 <br />Montgomery Watson Mining Group * 165 S. Union Boulevard, Suite 460 * Lakewood, Colo>ado 80218 "(303) 7635740 <br />