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I • SEDCAD NOTES <br />REFUSE AREA #2/3 -RECLAMATION <br />Typical values <br />Soils: Primarily originating from Forelle (B), Turley (B), Potts (B), and <br />Bowbac (B) with limited salvage from Moyerson (D). Hydrologic <br />soil group C was used as a conservative estimate. <br />CN = 84 Cultivated ag. Lands -Small grain -straight row -poor condition. <br />Soil K = 0.28 From NRCS <br />L =various Measured <br />S =various Measured <br />C = 0.24 Mulch under construction -Straw, 1 ton/acre.... -Subsoil - 1 <br />and 30% gradients <br />P = 1.0 <br />i • Variations from `Typical' values <br />For Structure #1, RP-2/3 Sediment Pond, the following variables were used: <br />CN = 98 Elevated due to impervious nature of pond. <br />C = 0.10 Very little erosion. Much of area is already part of sediment storage <br />area. <br />For Structure #2 & 11 watersheds, haul road, the CN was raised to 98 due to <br />permeability and C was lowered to 0.15 due to the gravel surface. <br />For Structure #3 and 4 watersheds, the CN was lowered to 81 since a substantial <br />portion of the areas contain undisturbed shrublands. <br />General Notes <br />• Minor adjoining sections of watersheds with undisturbed or miscellaneous <br />contributions included in analysis acreages. <br />• Model sensitivity to `C' and associated sediment yield is low since <br />sediment retention structures were engineered to accept runoff from bare <br />refuse. <br />• Model conservative due to using worst case conditions with out <br />consideration for consolidation, plant growth, surface roughening, etc. <br />