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The post-mining berm shown on the Loadout Area Surface and <br />Groundwater Hydrology Map, (Map 13), is designed to route runoff <br />and sediment to Sedimentation Pond L1. The l0-year, 24-hour <br />event was used as the design storm to size the post-mining berm. <br />The maximum flow rate for this event is 8.50 cubic feet per <br />second. A typical section of the Post-Mining berm is shown on <br />the East Loadout Area Pond L1 and Drainage Structure Design Map, <br />(Map 26), along with a summary table listing all design details <br />for the berm. The berm is designed as a triangular channel with <br />6H:1V and 3H:1V sideslopes. The post-mining berm ditch conforms <br />to the existing slopes at the loadout site. <br />Hydrology <br />Hydrology Inputs <br />All hydrology inputs for the post-mining berm are <br />shown on Table 23a SEDCAD+ Version 3.0, Pond L1 <br />and post-mining berm. <br />• <br />• <br />`"`°""-'" 173 Revised - June 1997 <br />°6/30/Vl OJ: f°.~ Yap <br />