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February 1999 Yoast Mine * 13-12 Drainage and Sediment Contra[ Plan • 4 <br />TABLE 13-12.2 <br />SOIL ERODIBILITY FACTOR <br />Soil Type Soil Texture Soil Erodibility <br />FactorlKl <br />Routt Cla Loam 0.28 <br />Winevada-S litro Com lex Loam 0.37 <br />Binco Clay Loam 0.28 <br />Coutis Silt Loam 0.37 <br />Aaber Cla 0.28 <br />S litro Loam 0.20 <br />Winevada Loam 0.43 <br />Foidel Silt Loam 0.28 <br />Sk wa Silt Loam 0.28 <br />Roxal Variant Silt Loam 0.28 <br />,Spoil (Disturbed) Silt and Sand 0.16 <br />3.3 LENGTH-SLOPE FACTOR, LS <br />Input parameters to determine the LS factor were obtained from scaled maps of the watershed areas. <br />Values measured from the scaled maps are shown on the attached SEDCAD4 results. <br />3.4 CONTROL FACTOR, C <br />The control factor is used to account for vegetative or mulch cover. The values utilized aze shown on <br />Table 13-12.3, Control Factor (Renard et al, 1996) (Schwab and Warner, 1987): <br />TABLE 13-12.3 <br />CONTROL FACTOR <br />Cover Cover T e Ve elation Control Factor <br />Undisturbed Aspen/Mountain <br />Shrub 25% canopy 12 m fall heightl, <br />80% rountl cover 0.042 <br /> Sagebrush 25% canopy 12 m fall heightl, <br />80% round cover 0.042 <br /> Herbaceous No cano ,80°k round cover 0.043 <br /> Mesic Draina a No cano , 40% round cover 0.100 <br />Disturbed Bare Ground None 1.0 <br />3.5 Practice Factor, P <br />The practice factor is used to account for conservation practices for the watershed. The values <br />utilized are shown in Table 13-12.4, Practice Factor (Renard et al, 1996)(Schwab and Warner, 1987): <br />L J <br />J <br />u <br />Montgomery Watson Mining Group * 165 S. Union Boulevard, Suite 460 *Lakew°od, Colorado 80128 *1303f 7635140 <br />