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SOUTHFIELD COAL MINE <br />CALCULATED SEDIMENTOLOGY DATA <br />ESTIMATED PRE -MINE CONDITION LOADOUT <br />R FACTOR <br />P 2,6 R <br />(in) I (Annual) <br />1.2 1 24.7 <br />R= 16.55(P21)12 <br />SOIL ERODIBILITYFACTOR: <br />SLOPE FACTOR: <br />Length <br />ft <br />Slope <br />% <br />Soil Type <br />Erodibility <br />LS <br />Factor <br />Factor, K <br />Clay Loam <br />0.32 <br />SLOPE FACTOR: <br />Length <br />ft <br />Slope <br />% <br />m <br />Slope <br />Angle <br />de <br />LS <br />Factor <br />220 <br />11.0% <br />0.6 <br />6.3 <br />2.60 <br />270 <br />3.0% <br />0.3 <br />1.7 <br />0.52 <br />400 <br />13.0% <br />0.6 <br />7.4 <br />4.64 <br />160 <br />3.0% <br />0.3 <br />1.7 <br />0.45 <br />Average LS = 2.05 <br />The LS Factor was calculated by. <br />LS = (Slope Length 172.6) ^m'(10.8'sin(s1ope angle) - 0.03) lbr Slopes < 9% <br />LS = (Slope Length 172.6)^m'(16.8'sin(slope angle) - 0.5) for Slopes > 9% <br />Where: <br />Slope < 3016 m = 0.3 <br />Slope = 4% m = 0.4 <br />5 % > Slope <10% m =0.5 <br />Slope > 10% m = 0.6 <br />COVER AND PRACTICE FACTORS: <br />Cover <br />Cover <br />Canopy <br />Cover <br />Practice <br />Type <br />Cover Factor <br />0.10 <br />Factor, C <br />Factor, P <br />Gross Annual Sediment Yield <br />1.62 tons/acre/year <br />Pre Mine Estimate <br />39% <br />0% <br />0.10 <br />1.00 <br />Weighted C = Total C'Ar @a/ Total Area = 0.100 <br />Weighted P = Total P'Area/ Total Area = 1.000 <br />ANNUAL SEDIMENT YIELD <br />The following spreadsheet calculates the predicted sediment yield for the project area. The gross sediment yield <br />is determined according to the Revised Universal Soil Loss Equation. <br />PARAMETER DESCRIPTION VALUE <br />Annual Rainfall Factor <br />24.72 <br />Soil Erodibility Factor <br />0.32 <br />Length Slope Factor <br />2.05 <br />Cover Factor <br />0.10 <br />Practice Factor <br />1.00 <br />Gross Annual Sediment Yield <br />1.62 tons/acre/year <br />