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• Table 10. RUSLE calculations for the four blocks in the post-mining stage Factor East Pit A East Pit B East Pit C $e16°n Explanation/Units R 19 19 19 19 Permit C-81-019 Exhibit 7 Item 13 K 0.28 0.28 0.28 0.28 Permit C-81-019 Exhibit 7 Item 13 LS 1.33 2.7 .742 3.06 RUSLE vers. 1.06 Application Table 11 C 0.0003 0.0003 0.0003 0.0003 RUSLE vers. 1.06 Program Printout P 0.38 0.38 0.38 0.38 Permit C-81-019 Exhibit 7 Item 13 A 0.0008 0.0016 0.0005 0.0019 Tons per acre per year The post-mine factors R, K, and P were previously calculated in Permit C-81-019 Exhibit 7 Item 13. The LS and C factors obtained from RUSLE vers. 1.06. The RUSLE Control "C" Factor is attached for the Division's information. The average K factor for the three dominant soil series (Campspass, Burnette, and Work) found on the pre-mining blocks was used for the K factor for each block selected for the success comparison. The control practice factor is used to account for vegetative andlor mulch cover. The support • practice is used to account for conservation practices in the selected watershed. Colowyo employs tillage practices such as seedbed preparation, chiseling and seeding on the contour resulting in a roughened surface exhibiting a series of furrows oriented perpendicular to the slope. In addition, large amounts of litter on the reclaimed surface also contribute to the roughness features. Colowyo also employs other features, such as contour furrows, ditches, stockponds, etc. which aid in additional erosion control well after vegetation has established. The LS factor for the reclaim areas was also calculated using the RUSLE vers. 1.06 application. The inputs used to calculate the factor are found in Table 11. Table 11. LS factor values for the post-mining blocks. East Pit A East Pit B East Pit C Section 16 Soil texture Loam Loam Loam Loam Gradient of 7 5% 12% 4 6% 13% Slope . Length of 1000 ft 1000 ft 1000 ft 1000 ft Segment LS factor 1.33 2.7 0.742 3.06 19