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Runoff Curve Number and Runoff 12/3/2007 16:00 <br />Project: 011 POND By: R L GUBKA Date: <br />Location NEW HORIZON MINE Checked: Date: <br />Developed <br />1. Runoff curve number (Cn) <br />Cover description CN Soil Type Area <br />pit pumpage 74 C 7.300 Acres <br />pasture 74 c 126.850 Acres <br />CN (weighted): 74 <br />2. Runoff <br />Frequency ..............: 25 yr <br />Rainfall, P (24 -hour) ..: 2.4 in <br />Runoff, Q ..............: 0.5529 in <br />Runoff Volume ..........: 6.1804 Acre -Ft <br />C- Factor Calculation <br />Project: 011 POND <br />Location: NEW HORIZON MINE <br />Developed <br />C- factor (CF) <br />Cover description CF <br />PIT PUMPAGE 0.500 <br />IRRIGATED 0.500 <br />CF (weighted): 0.500 <br />Total Area: 134.150 Acre <br />12/3/2007 11:59 <br />By: R L GUBKA Date: 12/03/07 <br />Checked: Date: <br />Area(Acre) <br />7.300 <br />126.850 <br />Graphical Peak Discharge 12/3/2007 16:07 <br />Project: 011 POND By: R L GUBKA Date: 12/03/07 <br />Location: NEW HORIZON MINE Checked: Date: <br />Developed <br />1. Data: <br />Drainage area: .................... A = 135.1500 Acres <br />X: \Western Fuels Nucla\Permit Revision 2009Wdequacy Response #1\Final Files\ATTACHMENT 2.05.3(3) -14 POND 011 <br />AS -BUILT 28JAN10 DRAFT.wpd Attachment 2.05.3(3) -14 -21 <br />