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North Portal Permanent Drainages, Pond 13, G Substation and CBA #1 <br />SOIL LOSS CALCULATION <br />AREA <br />R <br />K <br />I LS <br />C <br />I P <br />A <br />Ad'acent Area -Pond 13 & Reclaimed Draina es <br />30 <br />0.24 4.15 0.192 <br />1.0 <br />5.74 <br />Pond 13 & Reclaimed Drainages <br />0.98 <br />30 <br />0.24 <br />2.200 <br />0.191 <br />1.0 <br />3.03 <br />Adjacent Area Cameo Borrow Area #1 <br />0.92 <br />30 <br />0.24 <br />0.163 <br />0.192 <br />1.0 <br />0.23 <br />Cameo Borrow Area #1 <br />0.37 <br />30 <br />0.24 <br />0.163 <br />0.191 <br />1.0 <br />0.22 <br />It can be seen from the above calculation that the revegetated areas at the G - <br />Substation, Pond 13 and permanent drainages areas and the Cameo Borrow Area #1 <br />Sump may loose about 3.03 and 0.22 tons per acre per year, respectively, to erosion. <br />The G -Substation, Pond 13 and permanent drainages areas and the Cameo Borrow Area <br />#1 Sump adjacent areas, which represent the baseline conditions, may lose 5.74 and <br />0.23 tons per acre per year. Based on this demonstration, the reclaimed areas are not <br />contributing suspended solids in excess of pre -mining levels. <br />Pond 7 and Pond 9 <br />SOIL LOSS CALCULATION <br />AREA <br />R <br />K <br />LS <br />C <br />P <br />A <br />Adjacent Area -Pond 7 <br />30 <br />0.24 <br />0.706 <br />0.192 <br />1.0 <br />0.98 <br />Reclaimed Pond 7 Area <br />30 <br />0.24 <br />0.671 <br />0.191 <br />1.0 <br />0.92 <br />Adjacent Area -Pond 9 <br />30 <br />0.24 <br />0.27 <br />0.192 <br />1.0 <br />0.37 <br />Reclaimed Pond 9 Area <br />30 <br />0.24 <br />0.194 <br />0.191 <br />1.0 <br />0.27 <br />SL -9 Tab -9, Page 3 Revised 10/18/2016 <br />