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Section - 2.05.3 <br />Clean Watet Diversions -Clean water diversions have been established for most of the mine <br />disturbance areas to intercept and divert runoff from undisturbed upgradient areas around the mining <br />disturbance. The purpose of these diversions is to route natural runoff around disturbance areas to <br />avoid potential contamination or additional sediment contributions and to minimize the volume of <br />drainage passing across disturbance areas which must be intercepted and handled by the mine <br />drainage and sediment control systems. <br />Clean water diversions are designed to minimize erosion and additional sediment contributions and to <br />safely pass design flows while maintaining adequate freeboard. Where design flow velocities would <br />result in excessive erosive forces, adequate channel protection is provided to prevent erosion and <br />down-cutting. Clean water diversions are identified and associated design calculations for both the <br />diversion ditches and any associated culverts are provided in Exhibit 2.05-E3. Diversion locations <br />and configuration are shown on the Drainage and Sediment Control Plan Map, (Map 2.05-M4). <br />TR-60 2.05-36b Revised Jan 2009 <br />