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• <br />• <br />~/ <br />Yoast Mine <br />Pond 012/0'92A Systam <br />HYDRO?_OGIC [iVPUT PARAMETERS <br />SEDCAD 4 <br />Channel YPM-18 <br />Nlatershed ID -Structure 4 - SWS1 <br />Nlatershed Area: 6.9 <br />Curve Number: <br />HYDROLOGIC CURVE AREA <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres) <br />Reclaimed Fair (30% - 70%) B 71 6'88 <br />6.88 <br />Total <br />CURVE NUMBER 71 <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 (Yoast Mine 2007 Annual Reclamation Report, SCC, 2008). Field observations as of <br />September 2007 indicate areas seeded in 2006 display good stand establishment and growth. Approved Yoast 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 />13-12.1-178 <br />Revised 08/08 <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 />