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<br />• <br />toast Mine <br />Pond 012A Design <br />HYDROLOGIC INPUT PARAMETERS <br />SEDCAD 4 <br />Channel YPM-18 <br />Watershed ID -Structure 4 - SWS1 <br />Watershed Area: 6.9 <br />Curve Number: <br />HYDROLOGIC CURVE AREA <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres) <br />Reciaimed Fair (30% - 70%) B 71 6'88 <br />6.88 <br />Total <br />CURVE NUMBER 71 <br />Vegetation cover conditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation <br />Baseline Report, toast Study Area (ESCO Associates, 1993). Approved toast 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 I <br />Channel YPNi-18 <br />Y watershed ID -Structure 4 - SWS1 <br /> <br />Area: <br />WATERSHED TYPE <br />Reclaimed <br />Total <br />6.9 <br />k Factor and Control Factor. <br />VEGETATION COVER <br />Fair (30% - 70%) <br />SOIL GROUP k FACTOR FACTOR (acre: <br />g 0.32 0.042 6.9 <br />6.9 <br />0.32 0.042 <br />Undisturbed vegetation information taken from Exhibit 10-1, Premining Vegetation Map. Hydrologic soil group values <br />based on soil types which were taken from Exhibit 9-1, Soils Type and Soils Salvage Map. Disturbed area vegetation <br />information (Reclaimed: vegetated, fair [30% - 70%]; or, topsoiled, no vegetation) taken from 2007 Annual Reclamation <br />Chronological Seeding Map (toast Mine 2007 Annual Reclamation Report, SCC, 2008). Field observations as of <br />September 2007 indicate areas seeded in 2006 display goad stand establishment and growth. Approved toast Mine "k" <br />Factor and Control Factor values are presented in Appendix 13-12, Postmining Drainage and Sediment Control, Tables 13- <br />12.2 and 13-12.3, respectively. <br />• <br />TR-37 <br />13-12.1-68 <br />Revised 02/08 <br />