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EXHIBIT 25 <br />• USING THE UNIVERSAL SOIL LOSS EQUATION <br />A= RKLS CP #1 Mine #2 Mine <br />A is the soil loss in Tons/Acre/Year <br />R = rainfall factor 30 30 <br />K = soil erodibility factor 0.20 0.32 <br />LS = combined length slope factor <br />270' Slope 22.5$ 8.05 <br />100' Slope 19.7$ 3.93 <br />C = cropping management factor: <br />"C" - Crop Management Both Mines 0.036 0.036 <br />P = erosion control practice factor 1.00 1.00 <br />AREA R K LS C P A <br />#1 Mine 30 0.20 3.9 0.036 1.0 0.8 <br />#2 Mine 30 0.20 8.1 0.036 1.0 1.7 <br />It can be seen from the above calculation that the reclaimed <br />mine sites may lose up to 1.7 tons per acre per year to <br />erosion. The natural conditions may lose the amount equal <br />to the published T-Factor of 5 tons per acre per year to <br />erosion. <br />• The above calculation demonstrates that untreated drainage from <br />the reclaimed mines will contribute substaintially fewer <br />suspended solids than untreated drainage from the natural <br />surrounding area. <br />Therefore, the above caculation demonstrates that the No. 1 <br />and No. 2 Mine reclaimed areas cease to contribute additional <br />suspended solids above natural conditions as required by Rule <br />4.05.2(2)- <br />RUNOFF2.WK1 <br />• <br />-10- <br />