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subwatershed and taking an average of these measurements. As a general <br /> rule, lengths varied from 200 feet to 800 feet and slopes from 3 percent <br /> to 12 percent. <br /> Particle Size Distributions <br /> The particle size distribution for this sediment pond was taken from <br /> Simon, Li and Associates (Design of Sediment Control Measures for Small <br /> Areas in Surface Coal Mining) . This distirbution is representative of a <br /> sandy loam soil similar to those described in Tab 9 of the current Nucla <br /> Mine Plan. The specific gravity of the soil and the submerged bulk <br /> specific gravity were estimated based on the references cited above. <br /> STORAGE CAPACITY <br /> The storage capacity of Sediment Pond 006 was also analyzed using the <br /> SEDIMOT II computer program. The capacity of this pond was designed to <br /> provide storage for the runoff entering the pond as the result of a <br /> 10-year, 24-hour precipitation event plus the inflow from potential pit <br /> pumpage while maintaining a minimum of 0.5 feet of freeboard from the <br /> emergency spillway elevation. This design also includes a minimum <br /> storage volume for sediment. Table 4 is a summary of the designed <br /> storage capacity. <br /> TABLE 4 <br /> Design Storage Capacity Summary <br /> Sediment Pond 006 <br /> Capacity <br /> Elevation (Ac-ft) Description <br /> 5632.00 --- Elevation of Top of- <br /> Embankment <br /> 5631.54 --- Elevation of 100-year, <br /> 24-hour Peak Stage <br /> 5629.00 --- Elevation of Emergency <br /> Spillway <br /> --- 0.75 Storage Capacity dedicated <br /> to Emergency Spillway <br /> Freeboard <br /> 7 <br />