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• 4.05 HYDROLOGIC BALANCE 4.05.1 General Requirements The crushing, screening, and loadout activities at the Mt. Harris operation will be conducted to minimize chances in the hydrologic balance in both the permit and adjacent areas, and to prevent long-term adverse effects in the balance that might result from the activities. It should be noted that the loadout facilities are located in an area that has seen extensive disturbance from previous mining activities since the turn of the century. The postmining land use for the Mt. Harris Loadout will be for industrial use. Since the land use is consistent with the pre-mining land use, changes in the hydrologic balance will be minimized so that the postmining land use of industrial uses will not adversely affect the surrounding area. • It is planned that an embankment and a small sedimentation pond will be used to prevent any discharge greater than a 10-year, 24-hour event from leaving the site. Likewise, no acid-forming or toxic-farming materials are present in the area which would require any special handling. No coal processing waste will be produced. As discussed in Section 2.05.4, Mt. Harris will plan to cover the area after reclamation with 2 inches of gravel to prevent wind or water erosion. 4.05.2 Water Quality Standards and Effluent Limitations The permit area of the Mt. Harris loadout will be surrounded by an embankment which will prevent water from exiting the affected area. This water will be routed to a sedimentation structure such that no water will be allowed off the site. The embankment and sedimentation pond have been designed and will be constructed and maintained to effectively trap sediment from runoff resulting from a 10-year, 24-hour • precipitation event. Drainage from the operational area is not anticipated to create any problems with regard to adjacent water 4.05-1