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3. Anchor top of blanket at end of channel section using trench and/or staples/stakes. <br />4. Unroll center blanket in direction of water flow on bottom of channel. Securely fasten <br />blanket to soil surface with staples/stakes in accordance with manufacmrex's staple <br />pattern guide. If available, use colored dot pattern corresponding to the manufacturer's <br />recommended staple pattern- In applicable, overlap adjacent blankets and staple. <br />5. Anchor full-length margin of blankets at top of side slopes with a row of staples/stakes. <br />Backfill soil material over final 12-inches of blanket margin and compact. <br />3.3 Rock Riprap Channel Desiga <br />Rock ripxap may be used as a channel lining for the steepest channel sections. Riprap size was <br />determined using the SEDCAD4 xprap lined channel sub-routine, utilizing the PADER (Pennsylvania <br />Department of Environmental Resources, Stover, 1990) method. Given the uncertainty in determuilug <br />riprap Dso for steep slopes with the PADER Method, SCC adds an additional 3-inches to the <br />SEDCAD4 model recommended Dso size. <br />3.4 Channel Design Summary <br />The channel design is summarized in Table 4, Cbanne! PLl Derign Summary. The SEDCAD4 channel <br />utility outputs axe presented in Attachment C, Cbauuel Derign Retultr. <br />TABLE 4 <br />CHANNEL PL-1 DESIGN SUMMARY <br /> <br />Dischazge <br />Slope Bottom <br />Side Slope <br />Velocity Flow Design <br />Liner <br />Channel (cfs) (%) Width (H:1V) (fPs) Depth Depth TYPe <br /> (tt) @ (ft) <br /> 2-19 8.8 1.20 1.50 TRM <br />PL-1 7.4 20-44 3 4 6.5 0.4 0.7 6-inch Dso <br /> 45-47 6.5 0.3 0.6 9-inch Dso <br />Notes: Velocity value based on maximum grade for haze soil conditions. <br />Flow depth value calculated using minimum grade for vegetated with TRM conditions. <br />Desi de th assumes 0.3 feet of freeboard. <br />4.0 REFERENCES <br />Colbond Geosynthetics, Inc., Product Specificatiou Informatiou, Enka, North Carolina 28728, <br />www. colbond-usa.com. <br />Erosion Control Technical Council (ECTC), 2006. Standard Specifzcationr for Rolled Erorion Control <br />Products, St. Paul, Minnesota 551]8, www.ectc.oxg <br />Greenfix America, Product Specifzcation Information, Brawley, California 92227, www.gxeenfix.com <br />North American Green, Product Specification Information, Evansville, Indiana 47725 <br />Schwab, P.J., 1998. SEDCAD4 for Windomr. Civil Software Design, Ames, Iowa. <br />SoIl Conservation Service (SCS), 1986. Eugineering Field Handbook, Chapter 7, Grarred Waterways. U.S. <br />Old Wolf Creek Area Remediation Plan 7 Revised 06/07 <br />