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Peabody Sage Creek Mine - Drainage and Sediment Control Plan <br />control sediment delivery from the SAE and that peak 24 -hour average settleable solid <br />concentrations would be less than the water quality criterion (0.5 ml /1). Table 2.05.3- E2 -14, Small <br />• Area Exemption Summary, summarizes the results of the SEDCAD+ modeling for the SAE. Results <br />of the SAE demonstration are presented in Appendix 2.05.3 -E2 -J, Small Area Exemption <br />Demonstration. As presented in the SAE demonstrations, alternative sediment control is not needed <br />to treat surface runoff from the various areas of the SAE. <br />0 <br />TABLE 2.05.3 -E2 -14 <br />Small Area Exem tion Summar <br />If ASC Installed <br />Peak <br />Inflow <br />Need <br />Outflow <br />Area <br />Acres <br />Runoff <br />Concentration <br />for <br />(cfs) <br />24AA (ml/1) <br />ASCZ <br />Concentration <br />Type of ASC <br />24AA ml/1) <br />Old Boneyard <br />2.5 <br />0.76 <br />0.24 <br />N <br />0.01 <br />porous rock check dam <br />New Boneyard <br />0.82 <br />0.76 <br />0.47 <br />N <br />0.06 <br />porous rock check dam <br />(NWF -1 <br />New Boneyard <br />0.83 <br />0.77 <br />0.06 <br />N <br />0.0 <br />porous rock check dam <br />WF -2 <br />New Boneyard SWF) <br />0.4 <br />0.34 <br />0.31 <br />N <br />0.01 <br />porous rock check dam <br />New Boneyard Gate <br />0.70 <br />0.60 <br />0.35 <br />N <br />0.01 <br />porous rock check dam <br />Office Parking Area <br />1.0 <br />0.36 <br />0.22 <br />N <br />0.01 <br />porous rock check dam <br />Notes: 1) 24AA -peak 24 hour arithmetic average settleable solids concentration <br />2 ASC - altemative sediment control <br />7.0 REFERENCES <br />Barfield, B.J., R.C. Warner, and C.T. Haan, 1981. Applied Hydrology and Sedimentology for <br />Disturbed Areas. Oklahoma Technical Press, Stillwater, OK. 603p. <br />Colbond Inc., Product Specification Information, Enka, North Carolina 28728, www.colbond- <br />usa.com <br />to <br />Erosion Control Technical Council, 2006. Standard Specifications for Rolled Erosion Control <br />Products, St. Paul, Minnesota 55118, www.eetc.org <br />Haan, C.T., B.J. Barfield and J.C. Hayes, 1994., Design Hydrology and Sedimentology for Small <br />Catchments. Academic Press, Inc. San Diego, CA. 588p. <br />Greenfix America, Product Specification Information, Brawley, California 92227, <br />www.greenfix.com <br />2.05.3 -E2.25 <br />