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I ~ TRAPPER MINE <br />SEDIMENT LOAD DEMONSTRATION <br />BLOCK A&H PIT RSB 95-01 POST-MINING <br />Area 433.6 acres <br />Curve Number <br />Hydrologic Soil Group: B (Permit G81-010, Appendix O, Section XII) <br />Cover Type: Pasture, Grassland, or Range <br />Hydrologic Condition: Good <br />CN (AMC II): 61 (SEDCAD 4 CN table -Other Agricultural Lands) <br />CN (AMC III): 78.8 (Barfield, Warner, Haan p. 84) <br />Erodlbility Factor <br />K: 0.25 (Permit No. C-81-010, Appendix O, Section XIII, Table E-4) <br /> <br />Control Factor <br />Type and Height of Canopy: None <br />Canopy Cover: None <br />Percent Ground Cover: 90.7% (Trapper Mine Phase 11 Bond Release App., Table 2.2-1) <br />CP: 0.012 (SEDCAD 4 table for Permanent Pasture, Rangeland) <br />Roughness Modifier: 0.65 (Contour fanning operations, effective herbaceous cover, <br /> contour ditches, livestock water tanks) <br />Modified CP: 0.007 <br />Average Slope and Slope Length (previously determined for range sites A 8 B under SL-1 and SL-2) <br />Site <br />H Pit RSB <br />A Pit RSB <br />Average <br />Time of Concentration <br />Land Use Category <br />Sbpe <br />Length (ft) <br />Tc (hrs) <br /> <br />SCADINPS2.xls, ASH RSB <br />Len th Sloe <br />463 17.1 SL-2 <br />579 17.2 SL-1 <br />521 17.2 <br />1 Forest with heavy ground litter (overland flow) <br />17.2% <br />521 <br />0.139 <br />(18I2ar2004 <br />