2008-12-04_PERMIT FILE - C1994082 (2)

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• YOAST MINE Pond 10 System HYDROLOGIC INPUT PARAh1ETERS SEDCAD 4 Structure 10 - S~PiS1 Watershed -Channel YFNt-21 B Watershed Area: 24.6 Curve Number: HYDROLOGIC CURVE WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER AREA (acres) Reclaimed Fair (30%<x<70%) B 71 24.57 Total 24.6 CURVE NUMBER 71 Vegetation cover conditicns presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation Baseline Report, Yoasf Study Area (ESCOAssociates, 1993). Approved Yoast Mine curve numbers are presented in Attachment 13-12, Postmining Drainage and Sediment Control, Table 13-12.1. Values were adapted from Urban Hydrology fcr Small Wafersheds, Technical Re/ease No. 55, Soil Conservation Service, 1986. SEDCAD 4 Structure 10 - SWS1 Watershed YFM-21 B Sedimentology: k factcr SOILS MAP UNIT/SOILS HYDROLOGIC SOIL SERIES GROUP k FACTOR AREA (acres) d l i R B 0.32 24.57 a me ec Total 24.6 Weighted k Factor 0.32 Soils series infomtatien from Ycast Mine Permit Application Package (see Tab 9, Soil Baseline Study [Nyenhuis, 1994]). Hydrologic Soil Group values are approved Yoast values (see Attachment 13-12, Table 13-12.2), The soil erodibility factor, "k-Factor", values are presented in Attachment 13-12, Table 13-12.2. SEDCAD 4 Structure 10 - SWS1 Watershed YPM-21 B Sedimentology: Control Factor CONTROL LAND USE CONDITION COVER TYPE VEGETATION FACTOR AREA (acres) d i R l Reclaimed 60% ground cover 0.042 24.57 me ec a Total 24'6 Weighted Control Factor 0.042 The Control Factor values are approved Yoast Mine values as presented in Attachment 13-12, Table 13- 12.3. The values were originally presented in Renard, et al. (1997) Predicting Soil Erosion by Water. A Guide to Converation Planning with the Revised Universal Soil Loss Equation (RUBLE), Agricultural Handbook 703, U.S. Department of Agriculture as reported in Warner et al. (1998) as reported in Warner et al. (1998). TR-37 13-3A.1-A.38 Revised 02/08