2019-10-10_GENERAL DOCUMENTS - C1981010

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Table 6. USLE Variables and Basis for Selection. Pre-mining Variable Trapper's Trapper's Source Division's Comment Selection pp R 30 SCS Map: R factors for Colorado Reasonable, as per Trapper's location on R factor map. K 0.25 Trapper Permit C1981010 Reasonable, as per soil types of bond release Appendix Q Section XIII,Table E3 blocks delineated on map M29. LS 6.83 SCS LS Table, 675 ft, 15%Sloe Reasonable based on the 15%slope and 675 ft. p slope length C 0.05 NRCS C factor table for specified Reasonable as per pre-mining rangeland conditions conditions and applicable C value table. NRCS P factor table for specified Reasonable as per erosion control practice P 1 conditions factor,consistent with pre-mining practice on bond release blocks. Post-mining Variable Trapper's Trapper's Source Division's Comment Selection pp R 30 SCS Map: R factors for Colorado Reasonable, as per Trapper's location on R factor map. K 0.25 Trapper Permit C1981010 Reasonable,as per soil types on bond release Appendix Q Section XIII,Table E3 blocks delineated on map M29. LS 6.83 SCS LS Table, 675 ft, 15%Sloe Reasonable based on the 15%slope and 675 ft. p slope length NRCS C factor table for permanent pasture, rangeland, idle land and C 0.014 grazed woodland - no canopy, Reasonable as per vegetation data submitted 74.1 herbaceous cover,grass type with SL19 application (Table 1.2-1). (Table 1.2-1 of bond release application. P 1 NRCS P factor table for specified Reasonable, as no control practices were conditions employed. SEDCAD Comparison: Trapper utilized baseline data for selecting SEDCAD 4 parameters for modeling pre-mining conditions. Trapper utilized recent vegetative data in the bond release submittal for modeling post-mining conditions. The parameters employed in the SEDCAD model and their definitions are presented in the table below: Permit Number C 1981010 SL19