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• STORAGE CAPACITY <br />The storage capacity of Sedimentation Pond 002 was also analyzed using <br />the SEDIMOT II computer program. Table 2 is a summary of the as-built <br />storage capacity (see Exhibit 13-13A for pond geometry). <br />TABLE 2 <br />As-Built Storage Capacity Summary <br />Sediment Pond 002 <br />Stage Capacity <br />Elevation (Feet) (Ac-f t) Description <br />5694.2 0.0 0.00 Bottom of Pand <br />5697.0 2.8 0.07 Elevation of Principal <br />Spillway and 100% <br />Sediment Storage <br />5699.36 5.16 0.28 10-year, 24-hour Peak <br />Stage <br />5700.10 5.9 0.35 Elevation of Emergency <br />Spillway <br />• 5700.75 6.55 0.44 25-year, 24-hour Peak <br />Stage <br />5701.35 7.15 0.52 100-year, 24-hour Peak <br />Stage <br />5703.3 9.1 0.84 Top of the Embankment <br />Peabody does not anticipate any pit pumpage or other inflow to the pond <br />at this time. <br />SPILLWAY <br />Sediment Pond 002 provides for a combination of principal-emergency <br />spillway to safely discharge the runoff from a 25-year, 24-hour storm. <br />The principal spillway inlet will also be used as the nonclogging <br />dewatering device and is located at an elevation higher than the maximum <br />sediment storage volume (Elev. 5697.0). The principal spillway inlet is <br />a 0.5-inch diameter hole located on the riser of the emergency spillway <br />drop inlet structure (see Exhibit 13-13A) and located in a position on <br />the embankment so as to prevent short-circuiting as much as possible. <br />. The stage-discharge relationship of the emergency spillway inlet (12" <br />4 <br />