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TRAPPER MINE <br /> SEDIMENT LOAD DEMONSTRATION <br /> BLOCK A,D&H PITS RSC 03-04 PRE-MINING <br /> <br /> Area 89.7 acres <br /> Curve Number <br /> Hydrologic Soil Group: B (Permit <br /> Cover Type: Oak/Aspen <br /> Hydrologic Condition: Fair <br /> CN (AMC II): 48 .(SEDC <br /> CN (AMC III): 68.2 (Barf <br /> Erodibility Factor <br /> K: 0.25 (Perm <br /> Control Factor <br /> Type and Height of Canopy: <br /> Canopy Cover: <br /> Percent Ground Cover: <br /> CP: <br /> Average Slope and Slope Length <br />C-81-010, Appendix Q, Section XII) <br />- Sage/Grass (Permit C-81-010, Appendix Q, Section XII) <br />AD 4 CN table - Arid & Semi-arid Rangelands) <br />eld, Warner, Haan p. 84) <br />it No. C-81-010, Appendix Q, Section XIII, Table E-4) <br />Appreciable brush - 2 m fall ht. <br />50% (Permit C-81-010, Table 2.3-13) <br />55.4% (Permit C-81-010, Table 4.4-2, range site area-weighted data) <br />0.049 (SEDCAD 4 table for Permanent Pasture, Rangeland) <br />Elevation <br />Length Change Sloe <br />A-Pit RSC 250 10 4.0 <br />200 10 5.0 <br />Average 225 10 5 <br />D-Pit RSC 650 110 16.9 <br />650 95 14.6 <br />350 40 11.4 <br />Average 550 82 14 <br />H-Pit RSC 400 40 10.0 <br />525 30 5.7 <br />900 92 10.2 <br />250 40 16.0 <br />• <br />09/12/2008 <br />Land Use Category 1 Forest with heavy ground litter (overland flow) <br />Slope 10.0% <br />Length (ft) 431 <br />Tc (hrs) 0.149 <br />Average 519 51 10 <br />Overall average 431 47 10 <br />Time of Concentration <br />SCADINPS2.x1s. A,D&H RSC