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Peabody Sage Creek Mine - Drainage and Sediment Control Plan <br />during three (3) events in 1993. The sample results indicated only one sample from one <br />location exceeded the receiving stream water quality criterion (0.5 milliliters per liter [ml /1]). <br />Because the sampling results were inconclusive, Seneca Coal Company modeled runoff <br />from the areas using SEDCAD+ (Schwab, 1988) to demonstrate that alternative sediment <br />control methods, if necessary, would successfully control sediment delivery from the SAE <br />and that peak 24 -hour average settleable solid concentrations would be less than the water <br />quality criterion (0.5 ml /1). Table 2.05.3- E2 -14, Small Area Exemption Summary. As <br />presented in the SAE demonstrations, alternative sediment control is not needed to treat <br />surface runoff from the various areas of the SAE. <br />TABLE 2.05.3 -E2 -14 <br />Small Area Exem tion Summa <br />If ASC Installed <br />Outflow <br />Type of ASC <br />Area <br />Acres <br />Peak <br />Inflow Concentration <br />Need for <br />Runoff <br />24AA' (m1 /1) <br />ASCZ <br />Concentration <br />(cfs) <br />24AA ml /1 <br />Old Boneyard <br />2.5 <br />0.76 <br />0.24 <br />No <br />0.01 <br />Porous rock <br />check dam <br />New Boneyard <br />0.82 <br />0.76 <br />0.47 <br />No <br />0.06 <br />Porous rock <br />(NWF -1) <br />check dam <br />New Boneyard <br />0.83 <br />0.77 <br />0.06 <br />No <br />0.0 <br />Porous rock <br />(NWF -2) <br />check dam <br />New Boneyard <br />0.4 <br />0.34 <br />0.31 <br />No <br />0.01 <br />Porous rock <br />(SWF) <br />check dam <br />New Boneyard <br />0.70 <br />0.60 <br />0.35 <br />No <br />0.01 <br />Porous rock <br />Gate <br />check dam <br />Office Parking <br />1.0 <br />0.36 <br />0.22 <br />No <br />0.01 <br />Porous rock <br />Area <br />check dam <br />Notes: 1) 24AA - peak 24 -hour arithmetic average settleable solids concentration <br />2) ASC - alternative sediment control <br />7.0 REFERENCES <br />Barfield, B.J., R.C. Warner, and C.T. Hann, 1981. Applied Hydrology and Sedimentology for <br />Disturbed Areas. Oklahoma Technical Press, Stillwater, OK. 603 pp. <br />Colbond Inc., Product Specification Information, Enka, North Carolina 28728, <br />www.colbond - usa.com <br />Erosion Control Technical Council, 2006. Standard Specifications for Rolled Erosion <br />Control Products, St. Paul, MN 55118, www.ectc.or <br />Haan, C.T., B.J. Barfield and J.C. Hayes, 1994. Design hydrology and Sedimentology for <br />Small Catchments. Academic Press, Inc. San Diego, CA. 588pp <br />Greenfix America, Product <br />www.greenfix.com <br />Specification Information, Brawley, <br />CA 92227, <br />TR -0/ 2.05.3 -E2.26 Revised 04/12 <br />