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• Ponds. Impoundments and Diversions <br />To control runoff and protect surface water quality, TCC will construct diversion ditches, <br />sedimentation pond and a dugout pond. The Sedimentation Control and Small Area <br />Exemption Map (Map 14) shows the locations of the diversion structures, the sediment <br />pond and the dugout pond. The design and dimensions of the sediment pond are <br />represented on the Sedimentation Pond Design Map (Map 7). <br />The sedimentation ponds have been designed to collect all runoff from the facilities area. <br />The ponds provide a method for meeting the water discharge limitations of the NPDES <br />Permit for operation of the facility. Since no water is used during [he operation of the <br />facility except for dust control, the ponds only has to serve as a treatment facility for <br />runoff from the facilities area. The sediment ponds have been designed and constructed <br />to adequately contain and allow treatment as required of runoff from the facilities area. <br />Detailed calculations are shown in Exhibit 9, Drainage and Sediment Control Plan <br />Calculations. <br />The initial phase in the construction of the sedimentation ponds will be to clear all <br />unstable material from the location of the pond embankment. No coal or coal processing <br />waste will be used in the embankment. Any fill material used in the embankment will be <br />selected to exclude the presence of sod, large roots or frozen material. The placing and <br />• spreading of any fil] material will be started at the lowest point in the embankment <br />foundation. Thin, horizontally continuous lifts will be systematically placed and <br />compacted to final constructed height. <br />The ponds will be examined quarterly for structural weakness, erosion and other <br />hazardous conditions. Maintenance procedures may include mowing or cutting excessive <br />vegetative growth to facilitate inspections and repairs, keeping ditches, culverts and <br />spillways free of debris and removing all combustible material other than mulch and <br />other material required for erosion control and surface stability. Sediment will be <br />periodically removed from the sedimentation ponds to ensure proper function. The <br />sediment removed from the ponds will be placed in the sediment storage pile shown on <br />Map 5. <br />The maximum amount of material to be stored in the sediment pile will be 1500 tons <br />which is approximately the size of the sediment pile as of July 1992. Annually, during <br />the summer months, a portion or all of the sediment pile will be spread over the site to <br />improve drainage. Portions or all of the pile may also be transported to Mountain Coal. <br />Company's approved gob disposal area. <br />C~ <br />2.05-3 <br />Rev. 6-15-98 <br />Permit Renewal 3 <br />/hQ-!7 <br />