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CANOPY NO APPRECIABLE CANOPY <br />PERCENT GROUND COVER <br />40.0% 47.5% 60.0% <br />No G 0.100 0.078 0.042 <br />appreciable d"acent C "Factor.078 <br />canopy <br />RECLAIMED AREA -"C" FACTOR <br />No appreciable canopy. Canopy is assumed to be the cover contributed by trees and shrubs. Based on <br />the 2009 Vegetation Evaluation the combined tree and shrub cover totals 9.4 %. The percent ground cover for <br />the reclaimed area shown on the preceding page is 54.4 %. Use figure 7 identified above and <br />interpolate to determine the C factor for 54.4% cover. <br />CANOPY NO APPRECIABLE CANOPY <br />PERCENT GROUND COVER <br />40.0% 54.4% 60.0% <br />No G 0.100 0.058 0.042 <br />appreciable Reclaimed 'C" actor.058 <br />canopy <br />USING THE UNIVERSAL SOIL LOSS EQUATION <br />A= RKLSCP <br />• <br />A is the soil loss in Tons /Acre/Year <br />A <br />30 0.24 0.62 0.078 1.0 0.35 <br />Adjacent Area <br />30 0.24 0.73 0.058 1.0 0.31 <br />Reclaimed Area <br />r1 <br />�J <br />It can be seen from the above calculation that the revegetated area of the reclaimed mine site <br />may loose about 0.31 tons per acre per year to erosion. The baseline conditions may loose <br />about 0.35 tons per acre per year to erosion. <br />The above calculation demonstrates that untreated drainage from the reclaimed area will <br />contribute fewer suspended solids to streamflow or runoff outside the permit area <br />as untreated drainage from the natural surrounding premining area. <br />MR -11 2.05 -8vi <br />MRi) <br />I' )16) cri <br />10/09 <br />Adjacent Reclaimed <br />R = rainfall factor <br />30.00 <br />30.00 <br />K =soil erodibility factor- Nihill channery loan <br />0.24 <br />0.24 <br />LS =: combined length slope factor <br />0.62 <br />0.73 <br />C =cropping management factor: <br />"C" - Crop Management - Adjacent <br />Canopy 8.7% <br />Cover - Grass 9.3% <br />Ground Cover 47.5% <br />0.078 <br />"C" - Crop Management - Reclaimed <br />Canopy 9.4% <br />Cover - Grass 17.0% <br />Ground Cover 54.4% <br />0.058 <br />P = erosion control practice factor <br />1.00 <br />1.00 <br />Soil Loss <br />AREA R K LS <br />C <br />P <br />A <br />30 0.24 0.62 0.078 1.0 0.35 <br />Adjacent Area <br />30 0.24 0.73 0.058 1.0 0.31 <br />Reclaimed Area <br />r1 <br />�J <br />It can be seen from the above calculation that the revegetated area of the reclaimed mine site <br />may loose about 0.31 tons per acre per year to erosion. The baseline conditions may loose <br />about 0.35 tons per acre per year to erosion. <br />The above calculation demonstrates that untreated drainage from the reclaimed area will <br />contribute fewer suspended solids to streamflow or runoff outside the permit area <br />as untreated drainage from the natural surrounding premining area. <br />MR -11 2.05 -8vi <br />MRi) <br />I' )16) cri <br />10/09 <br />