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Tabetha, <br />Concerning the questions produced by DRN1S over the curve numbers in the Deacon/Jeffway drainage design. <br />These curve numbers were derived using a weighted average approach for sub -watersheds that contained more than <br />one curve number. The initial curve numbers utilized all have been approved in the permit: 87 CN for active mining and <br />47 CN for undisturbed conditions. <br />Structure 1: <br />Structure 2: <br />Structure 3: <br />(8.28 Acres)(87CN) + (9.24 Acres)(47CN) <br />17.52 Total Acres = 66 CN <br />(23.24 Acres)(87CN) + (13.97 Acres)(47CN) <br />37.21 Total Acres =72 CN <br />(12.48 Acres)(87CN) + (18.18 Acres)(47CN) <br />30.66 Total Acres <br />= 63 CN <br />Please contact me if there are any further concerns, <br />_T <br />Thomas Scott Paulson <br />Mining Engineer <br />P.O. Box 187 <br />Craig, CO. 81626 <br />(970) 824-4401 Ext. 466 <br />(970) 826-6178 (Fax) <br />(970) 819-6380 (Cell) <br />tom(tiArappermine.com <br />