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The initial phase in the construction of the sedimentation pond will be <br />• to clear all unstable material from the location of the pond. In no <br />instances will coal processing waste be used as an embankment. Any fill <br />material used in the embankment will be selected to exclude the presence <br />of sod, large roots, or frozen material. The placing and spreading of <br />any fill material will be started at the lowest point of an embankment <br />foundation. <br />The pond will be examined periodically for structural weakness, erosion, <br />and other hazardous conditions. Maintenance procedures may include <br />mowing or cutting excessive vegetative growth to facilitate inspections <br />and repairs, keeping ditches, culverts, and spillways free of debris, <br />and removing all combustible material other than mulch and other <br />material required far erosion control and surface stability. Sediment <br />will be removed from the sedimentation pond when the volume of sediment <br />accumulates to 60% of the design sediment storage volume. The <br />accumulated sediment found in the pond will be removed and placed in <br />• existing topsoil stockpiles if the sediment meets the appropriate <br />topsoil criteria. <br />Sedimentation pond and diversion ditch removal are discussed in Section <br />4.05. <br />The location of the proposed sedimentation pond and diversion structures <br />to be constructed within the permit area are shown on the Drainage and <br />Sediment Control Plan Map (Map 6). The Drainage and Sediment Control <br />Plan Map (Map 6) shows the location of watershed boundaries from which, <br />along with other sources, the design criteria were established. <br />Generally, the pond and spillways were sized and placed according to <br />such hydrological factors as required sediment storage volume, rate of <br />flow, and volume of flow for the appropriate storm event. The pond, <br />spillways, and construction methods have been designed according to such <br />engineering factors as structural integrity and ability, slope and <br />surface stability; adequacy in height, size, and shape to provide <br /> <br />2.05-18 <br />