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TRAPPER MINE <br />SEDIMENT LOAD DEMONSTRATION <br />BLOCK D8F PITS RSA88 96-01 PRE-MINING <br />I• <br />Area 263.0 acres <br />Curve Number <br />Hydrologic Soil Group: <br />Cover Type: <br />Hydrologic Condition: <br />CN (AMC Ip: <br />CN (AMC III): <br />B (Permit C-81-010, Appendix D. Section XII) <br />OaWASpen - Sage/Grass (Permit C-81-070, Appendix O, SecBon XII) <br />Fair <br />48 (SEDCAD 4 CN table -Arid & Semi-arid Rangelands) <br />68.2 (Barfield, Wamer, Haan p. 84) <br />Erodibility Factor <br />K: <br />Control Factor <br />Type and Height of Canopy: <br />Canopy Cover: <br />Percent Ground Cover: <br />CP: <br />0.25 (Permit No. C-81-010, Appendix O, Section XIII, Table E-4) <br />Appreciable brush - 2 m hall ht. <br />50% (Permit C$1-010, Table 2.3-13) <br />55% (Permit G81-010, Table 4.4-2, range site area-weighted data) <br />0.050 (SEDCAD 4 table for Permanent Pasture, Rangeland) <br />Average Slope and Slope Length (D pit range sites A88 previously determined under SL-1) <br />f ,, <br />u <br />Site <br />D Pit RSA <br />D Pit RSB <br />F Pit RSA&B <br />F-Pit RSA88 average <br />Overall Average <br />Time of Concentration <br /> <br />Land Use Category <br />Slope <br />Length (tt) <br />Tc (hrs) <br />Len th tt Slone (%1 <br />371 13.4 <br />483 15.3 <br /> Elevation <br />Length Chance Slone <br />500 115 23.0 <br />300 90 30.0 <br />250 90 36.0 <br />300 95 31.7 <br />350 125 35.7 <br />300 100 33.3 <br />500 60 12.0 <br />500 60 12.0 <br />900 140 15.6 <br />1500 225 15.0 <br />300 80 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 19.8 <br />464 16.7 <br />1 Forest with heavy ground litter (ovedand bow) <br />16.4% <br />464 <br />0.126 <br />SCADINPS2xb. D8F RSAB <br />