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• Pond 012 as-built calculations <br />Runoff Curve Number and Runoff <br />Project: POND 012 By: R. L. GUBIG4 Date: <br />Location: NEW HORIZON MINE Checked: Date: <br />Present <br />UNDISTURBED 80 C 12.152 Acres <br />UNDISTURBED 0.500 12.152 Acres <br />DISTURBED 85 C 42.933 Acres <br />DISTURBED 0.500 42.933 Acres <br />CN (weighted): 84 <br />CF (weighted): 0.500 <br />2. Runoff <br />Frequency ..............: 10 yr <br />Rainfall, P (24-hour) ..:2.00 in <br />Runoff, O ..............:0.74 in <br />Runoff Volume ..........:3.39 Acre-Ft <br />• <br />Graphical Peak Discharge <br />Project: POND 012 By: R. L. GUBKA Date: 03/29/05 <br />Location: NEW HORIZON MINE Checked: Date: <br />Presenl <br />1. Data: <br />Drainage area :....................A = 55.0850 Acres <br />Runoff Curve Number :.............CN = 84 <br />Time of Concentration:...........Tc = 0.23 <br />Storm Type :....................... = II <br />Pond and swamp areas spread <br />throughout watershed ............... = 0.00 percent of A <br />0.0000 Acres <br />• REVISED MARCH 2006 Attachment 205.3(3)-13-3 <br />