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USING THE UNIVERSAL SOIL LOSS EQUATION <br />A=RKLSCP <br />A is the soil loss in Tons/Acre/Year <br />R = rainfall factor I <br />K = soil erodibility factor - Cerro Stony Loam <br />LS = combined length slope factor <br />C =cropping management factor. <br />"C" -Crop Management -Adjacent <br />Canopy 43.7%1 -- <br />Ground Cover <br />"C" - Crop Management - East Mine <br />! _Canopy -- - - - 0.3%1 <br />Ground Cover _ 66.9_%1 <br />P = erosion control practice factor <br />Upper <br />Lower <br />Adjacent <br />Area <br />East Mine <br />East Mine <br />Reclaimed <br />Adjacent <br />Area <br />East Mine <br />East Mine <br />Reclaimed <br />30.00 <br />30.00 <br />30.00 <br />3_0.0_0_ <br />0.17 <br />- 17.51 <br />0.17 <br />24.25 <br />0.171 <br />0.17 <br />- 23.44 <br />0.032 _ <br />0.17 <br />20.42 <br />0.171 <br />3.82 <br />Adjacent East Mine - Lower <br />I 30 1 0.17 <br />0.032 <br />1.t)0 <br />1.00 1.00 1.00 <br />SOIL LOSS CALCULATION <br />AREA R K <br />LS I <br />C P <br />A <br />Adjacent Area -East Mine - Upper <br />30 0.17 <br />24.25 1 <br />_ <br />0.171 1.0 <br />21.18 <br />East Mine Reclaimed - Upper <br />30 0.17- <br />1 1 <br />1 2344 <br />- 0.032 1.0 - <br />3.82 <br />Adjacent East Mine - Lower <br />I 30 1 0.17 <br />1 20.422 <br />0.171 1.0 <br />17.84 <br />East -MineReclaimed- Lower <br />30 0.17 <br />17.512 <br />0.032 1.0 <br />j 2.86 <br />1 <br />It can be seen from the above calculation that the revegetated area of the East Mine (Upper) <br />and East mine (Lower) may loose about 3.82 and 2.86 tons per acre per year respectively to erosion. <br />The East Mine (Upper) and East Mine (Lower) adjacent areas which represents the baseline conditions <br />may lose 21.18 and 17.84 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 streamilow or runoff outside the permit area than untreated drainage from the natural <br />surrounding premining area. Based on this demonstration the four sedimentation ponds and the gob pile <br />pond at the east mine can be reclaimed. <br />TR -62 Volume 8A- 12 10116 <br />