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• s M. A. Koperski CAMP DRESSER 8 McKEEINC. MLRB Envimnmenlnl Suences OinsWn 23 May 1978 -2- ~? During and immediately after a precipitation event, mining will either cease until the active pit dries or water will be pumped from the active pit into the holding pond within that particular _~' mining area. The holding ponds have been sized to collect run- %~~• off from the respective mining areas during a 10-year 29-hour storm. '~ °yi. Small berms will be built along the edges of each mining cut as ~^ it is reclaimed to divert water into, the holding pond. These berms will be removed after reclamation is deemed successful. The diversion ditches at the tops of each mining area are intended to divert water away from the mining area, but into its normal drain- age pattern (i.e., into Grassy Creek). Rip rap will be installed at the outlet of each diversion ditch to minimize erosion. The diversion ditches will be filled and reclaimed after reclamation is complete. In anticipation of a precipitation event greater than the 10-year 24-hour design criteria, outlet structures from the holding ponds will be made by digging a ditch across the undisturbed land below the holding pond, The purpose for such a ditch (outlet structure) will be to drain excess water into Grassy Creek. The bottom of these ditches will be lined with rock to lessen erosion. Rip rap will be installed at the bottom of the ditch to reduce the kinetic energy of the running water and prevent erosion. These outlet structures will be filled and reclaimed after complete reclamation. Buffer zones have been shaded in yellow on the premining and mining plan map. The haul roads shown on the map must enter the buffer zone at several points within the permit area due to the topography of the land. The Rockcastle Company requests authorization to con- struct and use the haul roads shown on the premining and mining plan maps. The haul roads will be constructed to meet all applicable federal and state regulations on safety. The haul roads will also be con- structed to minimize contribution of the runoff water to the total suspended solid concentration in Grassy Creek, when possible, ditches will be constructed alongside the haul roads to carry run- off water. Straw dikes and/or ditch checks will be placed inter- mittently within these ditches. When necessary, cross-drains will be installed to transfer water to the side of the road where ditches with adequate sediment control can be constructed. Also, ditch relief drains will be installed to direct water into Grassy Creek as often as possible. This will prevent an accumulation of a torrent of water within the road ditches. Rip rap will be used at the exit of all ditch relief drains to prevent erosion.