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USING THE UNIVERSAL SOIL LOSS EQUATION <br />A=RKLSCP <br />A is the soil loss in Tons/Acre/Year <br />Adjacent <br />30.1% <br />Adjacent <br />63.1% <br />K <br />Area <br />Run -of -Mine <br />Area <br />West Mine <br />Ground Cover <br />Run -of -Mine <br />Reclaimed <br />West Mine <br />Reclaimed <br />R = rainfall factor <br />30.00 <br />30.00 <br />30.00 <br />30.00 <br />K = soil erodibility factor -Torriorthents <br />0.15 <br />0.15 <br />0.15 <br />0.15 <br />LS = combined length slope factor <br />7.74 <br />5.62 1 <br />16.215 <br />14.815 <br />C = crnnninn mannnpmpn4 fnr4nr- <br />0.014 1 <br />1.0 <br />0.96 <br />Adjacent Run -of -Mine ROM <br />"C"- Crop Management- djacent <br />Canopy <br />30.1% <br />Ground Cover <br />63.1% <br />K <br />I LS <br />"C" - Crop Management - West Mine <br />Canopy0.6% <br />A <br />Ground Cover <br />77.8/0 <br />"C" - Crop Management - ROM <br />Canopy 1 1 <br />0.4% <br />Ground Cover 1 <br />75.4% <br />= erosion control practice factor I 1 1.00 1.00 <br />0.034 <br />0.014 <br />It can be seen from the above calculation that the revegetated area of the West Mine and the Run - <br />of -Mine (ROM) area may loose about 0.96 and 0.41 tons per acre per year respectively to <br />erosion. The West Mine and Run -of -Mine adjacent areas which represents the baseline conditions <br />may lose 2.48 and 1.18 tons per acre per year respectively to erosion. <br />The above calculation demonstrates that untreated drainage from the reclaimed areas will contribute fewer <br />suspended solids to streamflow or runoff outside the permit area than untreated drainage from the natural <br />surrounding premining area. Based on this demonstration the two sedimentation ponds at the west <br />mine can be reclaimed and the pond and alternative sedimentation control devices at the ROM <br />area can be removed. <br />TR -58 ►9pp/dvPd Volume 8A - 5 03/14 <br />0l .)an .20/4 <br />SOIL LOSS CALCULATION <br />AREA R <br />K <br />I LS <br />C <br />P <br />A <br />Adjacent Area -West Mine <br />30 1 <br />0.15 <br />1 16.22 1 <br />0.034 <br />1.0 <br />2.48 <br />West Mine <br />30 <br />0.15 <br />T 14.82___ <br />0.014 1 <br />1.0 <br />0.96 <br />Adjacent Run -of -Mine ROM <br />30 1 <br />0.15 <br />1 7.740 1 <br />0.034 1 <br />1.0 <br />T 1.18 <br />Run -of -Mine ROM <br />30 1 <br />0.15 <br />5.620 <br />0.016 <br />1.0 <br />0.41 <br />0.014 <br />It can be seen from the above calculation that the revegetated area of the West Mine and the Run - <br />of -Mine (ROM) area may loose about 0.96 and 0.41 tons per acre per year respectively to <br />erosion. The West Mine and Run -of -Mine adjacent areas which represents the baseline conditions <br />may lose 2.48 and 1.18 tons per acre per year respectively to erosion. <br />The above calculation demonstrates that untreated drainage from the reclaimed areas will contribute fewer <br />suspended solids to streamflow or runoff outside the permit area than untreated drainage from the natural <br />surrounding premining area. Based on this demonstration the two sedimentation ponds at the west <br />mine can be reclaimed and the pond and alternative sedimentation control devices at the ROM <br />area can be removed. <br />TR -58 ►9pp/dvPd Volume 8A - 5 03/14 <br />0l .)an .20/4 <br />