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Please refer to Addendums A, B, end C for capacities of both spillways during passage of <br />the 10, 25, end 100-year storm events. Table 13-3C-12 presents the As-built details for <br />the principal and emergency spillway. <br />TABLE 53-3C-12 <br />As-Built and Emergency Spillway Data Summary <br />Sediment Pond 005 <br />Principal Spillway: <br />TYpe Drop Inlet (CMP) <br />Sn(et Elevation 6872.2 <br />Length 140 feet <br />Diameter 24 inches (opening) <br />Slope 1.4 X <br />10-Yr, 24-Hr Peak Stage (estimate) 6873.0 <br />Emergency Spillway: <br />TYpe Trapezoidal Channel <br />Channel Protection Rock <br />• Bottom Yidth 12 feet <br />Minimum Depth (w/freeboard) 2 feet <br />Length 40 feet (embankment) <br />Side Slopes 4H: 1V <br />inlet Elevation 6874.1 <br />100-year, 24-hour Peak Stage (estimate) 6875.7 <br />Summary <br />The capacity of Sedimentation Pond 005 is attributed partially to the embankment and <br />partially to the pond eKCavetion. During passage of the 10-year, 24-hour storm the <br />spillway does not discharge sediment downstream nor is there any flow through the <br />emergency spillway. In addition, the spillway is designed and constructed to safely <br />discharge Lhe 25 and 100-year, 24-hour storm event. <br />The embankment was constructed to be stable and provide adequate freeboard. Therefore, <br />based on the design, this structure complies with the appropriate regulaCions for a <br />sedimentation structure. A toe drain and horizontal drainage system was constructed to <br />collect any seepage and discharge below the embankment. A 4-inch PVC dewatering pipe was <br />13-3.13 Revised 08/11/02 <br />