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Design calculations and detailed specifications for post-mining drainages <br />are presented in Exhibit 19, Drainage and Sediment Control Plan. All <br />post-mining drainages have been designed to pass the peak flows resulting <br />from a 100-year, 24-hour storm event with a minimum freeboard with 0.3 <br />feet. <br />Post-mining drainages and temporary ditches will route any disturbed area <br />runoff to sedimentation ponds through the post-reclamation period to the <br />point of bond release. Following determination of reclamation success, <br />sedimentation ponds and temporary diversion ditches will be reclaimed and <br />post-mining drainages will be connected to existing natural drainages. <br />Where post-mining drainages intersect existing natural drainages, the <br />transition channel will be constructed to provide a smooth transition of <br />both channel configuration and flow. <br />4.05.18 STREAM BUFFER ZONES <br />• There are no surface drainages within either the mine or loadout areas <br />which exhibit perennial flow characteristics or which support a <br />significant biological community. Consequently, no stream buffer zones <br />are necessary and the provisions of this section are not applicable. <br />C~ <br />4.05-29 <br />