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• The principal spillway is a 24-inch (SIP culvert, with a 10-inch <br />diameter gated decant designed to dewater the pond. The gated decant <br />will drain the pond down to an elevation of 5,220.96 feet. To <br />maintain adequate capacity the water level must be maintained at <br />5,219.4 feet. EFCI will utilize a pump to remove the remaining <br />volume below the gated decant. A marker will be placed at the design <br />elevation (5219.4 ft.) to ensure that the water level is maintained <br />at or below this level. In addition, a mark will also be placed at <br />the design sediment level. Dewatering is performed only after 24 to <br />36 hours of detention time is achieved to allow for settling of <br />suspended solids. The emergency spillway is a riprap trapezoidal <br />channel designed to safely pass the peak discharge from the 25-year, <br />24-hour event. <br />Refer to Table 23,.Sedimentation Pond L1 - Design Summary, for design <br />results. The storage capacity table and stage/storage curve are <br />shown on the East Loadout Area Pond L1 and Drainage Structure Design <br />• Map (Map 26), along with cross section drawings illustrating all <br />design results. The storage capacity table and stage/storage curve <br />illustrate the pond's available sediment and runoff storage volume. <br />• <br />C:\86018-21.RESP <br />os/lz/ss e:osan, kep 169 Revised - July 1995 <br />