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Yoast Mine <br />Pond 0121012A System <br />HYDROLOGIC IiUPUT PARAMETi=RS <br /> SEDCAD 4 <br /> Channel YPM-2 <br /> Watershed ID -Structure 2 - SWS1 <br />~/ <br /> ~Natershed Area: 4.9 <br /> Curve Number: <br /> HYDROLOGIC CURVE AREA <br /> WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (a4r3si <br /> Reclaimed Fair (30% - 70%) B 71 <br />6 <br />0 <br /> Aspen/Mountain Shrub B <br />Good (>70%) 30 . <br />4.9 <br /> Total <br /> CURVE NUMBER 66 <br />Vegetation cover conditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation <br />Baseline Report, Yoast Study Area (ESCO Associates, 1993). Approved Yoast Mine curve numbers are <br />presented in Attachment 13-12, Postmining Drainage and Sediment Control ,Table 13-12.1. Values were <br />adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55, Soil Conservation Service, <br />1986. <br />SEDCAD 4 <br />Channel YPM-2 <br />d ID -Structure 2 - SWS1 <br /> Sedimentology: k factor AREE <br /> SOILS MAP UNITlSOILS HYDROLOGIC SOIL k FACTOR (acres <br /> SERIES GROUP <br />4 <br />30 <br /> B 0.32 . <br /> Reclaimed <br />B <br />0.23 0.6 <br /> 53C/DlE/F - Winevada loam 4 9 <br /> Total <br /> Weighted k Factor 0.31 <br />Soils series information from Yoast Mine Permit Application Package (see Tab 9, Soil Baseline Study <br />[Nyenhuis, 1994]). Hydrologic Sail Group values are approved Yoast values (see Attachment 13-12, Table <br />13-12.2). The soil erodibility factor, "k-Factor", values are presented in Attachment 13-12, Table 13-12.2. <br />SEDCAD 4 <br />Structure 2 - SWS1 <br />Watershed W-11 (YPM-11) <br />Sedimentology: Control Factor <br />CONTROL AREA <br />COVER TYPE VEGETATION FACTOR (acres) <br />LAND USE CONDITION <br />25% canopy, 80% 0.042 0.6 <br />Undistrubed AspenlMtn. Brush ground cover <br />Reclaimed Reclaimed 60% ground cover 0.042 4.3 <br />4.9 <br />I Weighted C Factor 0.042 1 <br />The Control Factor values are approved Yoast Mine values as presented in Attachment 13-12, Table 13- <br />12.3. The values were originally presented in Renard, et al. (1997) Predicting Soi! Erosion by Water.• A <br />Guide to Converation Planning with the Revised Universal Soil Loss Equation (RUBLE), Agricultural <br />Handbook 703, U.S. Department of Agriculture as reported in Warner et al. (1998) as reported in Warner et <br />al. (1998). <br />_ . _.. Revised 08!08 <br />TR-37 • - <br />