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TRAPPER MINE <br />SEDIMENT LOAD DEMONSTRATION <br />BLOCK D8F PITS RSASB 96-01 POST-MINING <br /> Area <br /> Curve Number <br />.263.0 acres <br />Hydrologic Soil Group: <br />Cover Type: <br />Hydrologic Condition: <br />CN (AMC II): <br />CN (AMC III): <br />Erodibility Factor <br />K: <br />Control Factor <br />B (Permit C-St-010, Appendix O, Section XII) <br />Pasture, Grassland, w Range <br />Good <br />61 (SEDCAD 4 CN table -Other Agricultural Lands) <br />78.8 (Barfield, Wamer, Haan p. 84) <br />0.25 (Permit No. C-61-010, Appendix O, Section XIII. Table E-4) <br />Type and Height of Canopy: Nona <br />Canopy Cover: None <br />Percent Ground Cover: 78.1% (Trapper Mine Phase II Bond Release App., Table 2.2-1) <br />CP: 0.007 (SEDCAD 4 table for Permanent Pasture, Rangeland) <br />Roughness Modifier: 0.65 (Contour fanning operations, effectlve herbaceous cover, <br />contour ditches, Ilvestock water tanks) <br />Modified CP: 0.005 <br />Averege Slope and Slope Length (D pit range sites A&B previously determined under SL-1) <br /> <br />it <br />D Pit RSA <br />D Pit RSB <br />F Pit RSASB <br />Time of Concentration <br />L_~ <br />F-Pit RSASB average <br />Overall Average <br />Land Use Category <br />Slope <br />Length (ft) <br />Tc (hrs) <br />L n th ft Slone (°'°) <br />371 13.4 <br />463 15.3 <br /> Elevation <br />Lenoth han a Io e <br />500 115 23.0 <br />300 90 30.0 <br />250 g0 36.0 <br />300 95 31.7 <br />350 125 35.7 <br />300 100 33.3 <br />500 60 12.0 <br />50D 60 12.0 <br />900 140 15.6 <br />1500 225 15.0 <br />app 60 20.0 <br />1100 190 17.3 <br />300 85 28.3 <br />350 65 18.6 <br />600 75 12.5 <br />537 105 19.6 <br />464 16.1 <br />1 Forest with heary ground litter (overland flow) <br />16.4% <br />464 <br />0.126 <br />SCADINP52.ris, DdF RSAB <br />