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<br /> <br /> <br />Yoast Mine <br />Pond O'f2A Design <br />HYDROLOGIC INPUT PARAMETERS <br />SEDCAD 4 <br />Pond 012A <br />OPTION 2 <br />Watershed ID -Structure 11 - SWS1 <br />Watershed Area: 3.8 <br />Curve Number: <br />HYDROLOGIC <br />CURVE <br />AREA <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres; <br /> <br />Reclaimed To soiled, No Ve etation <br />P g B 71 3.2 <br /> <br /> <br />AspeniMountain Shrub <br />Good >70% <br />( ) <br />B <br />30 0.6 <br /> <br />3 8 <br />Total <br /> CURVE NUMBER 65 <br /> SEDCAD 4 <br /> Pond 012A <br /> OPTION 2 <br /> Watershed ID -Structure 11 - SWS2 <br />Pond surface <br />Watershed Area: 1.5 <br />Curve Number: <br />HYDROLOGIC CURVE AREA <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (a;r~s) <br />Pond Water surface N/A 99 <br />1.5 <br />Total <br />CURVE NUMBER 99 <br />Vegetation cover conditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation <br />Baseline Report, Yoast Sfudy 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, Sail Conservation Service, <br />1986. <br />SEDCAD 4 <br />Pond 012A <br />OPTION 2 <br />watershed ID -Structure 11 - SWS1 <br />tology: k factor AREP <br />MAP UNITISOILS <br />HYDROLOGIC SOIL GROUP <br />2OR <br />k FA acres <br />( <br />SERIES O 3 3.20 <br />:d B <br />B <br />0.28 <br />0.6 <br />- Foidel loam 3.8 <br />Total <br /> Weiohted k Factor 0.31 <br />i~ <br />13-12.1-78 D <br />Revised 02108 <br />TR-37 <br />