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Chapter II <br /> (3) Central Complex/Preparation <br /> Plant Area . <br /> The central complex/preparation plant area is heavily used. The area is adjacent to <br /> Dutch and Bear Creeks. <br /> In this area are, besides the coal preparation plant, storage facilities, coal refuse <br /> disposal area, office/training center, maintenance shop, oil and gas storage, power <br /> transmission lines, parking lot, etc. <br /> The David E. Fleming Co. designed the drainage and sediment control plan for the <br /> area in May, 1978. See Att. 3 of Ap. II-13-7. <br /> The drainage plan has been updated as a result of new construction (blending bins) <br /> in the plant area. A chart giving the revised sediment pond capacity calculations is <br /> contained in the Attachment, on page 62.* <br /> (4) Adit/Rock Tunnel. <br /> Water discharged through the Adit/Rock Tunnel, and water flowing off the surface <br /> disturbed areas around the tunnel portal is collected in a system of diversion ditches <br /> and conveyed to sediment ponds. <br /> The Adit/Rock Tunnel portal area facilities are on both sides of the South Fork of <br /> Dutch Creek, and all facilities are constructed above the 100-year flood plain; <br /> normal creek runoff is routed through the portal area. To move equipment and rock <br /> spoil from one side of the creek to the other, cross-over culverts have been installed <br /> which are capable of handling the peak flow of the creek in a 100 year/24 hour <br /> storm event. <br /> A 10' diameter culvert and temporary fill is located in a tributary of the South Fork of <br /> Dutch Creek to be used for access to the tunnel face-up and yard area. A <br /> multi-plate pipe culvert with a cross-sectional area of 158 square feet has been <br /> installed in the main creek to gain access to the permanent tunnel spoil disposal <br /> area. <br /> Water collected above the rock disposal area is diverted around it to the sediment <br /> ponds by a 2800 foot long perimeter diversion ditch system. <br /> TR-5 was approved Oct. 16, 1986 for constuction of two ponds, in addition to the <br /> three previously constructed, for the Adit/Rock Tunnel area. <br /> * TR-3, approved 811186, allowed removal of one sediment pond from this area. <br /> 26 <br />