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SOIL LOSS COMPARISON - SNOWCAP COAL MINE <br />RECLAIMED VERSUS BASELINE (SHADSCALE REFERENCE AREA) CONDITIONS <br />SUMMARY OF RESULTS <br />The following pages are a summary of calculations presented to determine if untreated <br />drainage from reclaimed ponds 6, 10, 7, 9, & 13, CBA #2, CRDA Road #1, and the G <br />Substation areas are contributing suspended solids to the stream flow or runoff outside <br />the permit area in excess of pre -mining levels. <br />In accordance with Phase II and Phase III bond release guidelines, erosional stability will <br />be evaluated during the inspections. Evaluation of the reclaimed areas can be <br />supported by a demonstration of sediment loss. For these purposes, the Universal Soil <br />Loss Equation will be used (USLE). <br />The USLE is used to calculate the soil loss from the reclaimed and adjacent areas to <br />determine if untreated drainage from the reclaimed areas are contributing suspended <br />solids in excess of premining levels. The sediment volume calculation is prepared in <br />accordance with the USDA Technical Notes #50, dated January 1977. The maps and <br />figures utilized in the USLE are obtained from the referenced Agronomy Note #50. <br />Using the Universal Soil Loss Equation <br />A=RKLSCP <br />A is the soil loss in Tons/Acre/Year <br />R = Rainfall Factor <br />K = soil erodibility factor <br />LS = combined length of slope factor <br />C = cropping management factor <br />P = erosion control practice factor <br />For evaluation purposes, the reclaimed areas were broken into seven areas. <br />1. CBA 2 <br />2. Ponds 6 & 10 <br />3. North Portal Permanent Drainages, Pond 13 and the G Substation <br />SL -9 Tab -9, Page 1 Revised 10/18/2016 <br />