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SANBORN CREEK MINE PROTECTION OF THE HYDROLOGIC BALANCE SMALL AREA EXEMPTIONS The Sanborn Creek Mine portals are to be located approximately 4500 feet east of the Somerset Mine facilities. A haul road and conveyor is to be constructed between the new portals and the existing mine facilities. Sedimentation control for about one half of the haul road and conveyor is provided by existing sedimentation control structures. The existing sedimentation control system extends from the mine facilities to the east yard sediment pond. The Sanborn Creek Mine portals are to be located approximately 2100 feet east of the east yard sedimentation control pond. A corridor is to be constructed between the new portals and the east yard. The areas to be disturbed by the construction of this corridor are as follows: Area Description Acreage A Portal Area 0.6 Acres B Haul Road, Mine Water Treatment 1.3 Acres Pond, Ditches and Cut Slopes East of Sanborn Creek C Conveyor Corridor 0+00 - 13+00 0.6 Acres D Haul Road, Ditches and Cut Slopes 0.92 Acres west of Sanborn Creek to East Yard E Conveyor Corridor 13+00 - 21+00 0.2 Acres Areas B and D; the haul road, cut slopes and mine water treatment pond are not considered disturbed area in accordance with rule 4.05.2(4). Areas A, C & E are considered disturbed area for which small area exemptions are requested. Drawing 5-021 is a small area exemption map which shows the exempted areas. Drawing 5-004 shows the details of the sedimentation control measures proposed. It is not feasible to pass the run-off from these areas through a sediment pond because on space limitations and grade. The conveyor corridors slopes towards the portal area where there is simply not adequate room to construct a sediment pond. The area is restricted to the south by the railroad and State Highway 133 and it is restricted to the north by steep mountainous terrain. • 8-86