2010-06-04_PERMIT FILE - C1982056A (9)

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• 500 -foot, 36 -inch conveyor extending from the reclaim bunker to the top of the truck loadout • Conveyor support bents • Truck loadout (fabricated metal structure, with steel siding, approximately 85 -feet high, w /140 -ton surge bin, 35 -ton weigh bin, sampling system, and Motor Control (MCC) room) • Truck loadout foundation and concrete loading pad • 2,5 -inch water supply line and valving • Electrical distribution line • Truck loadout yard area and road Because the truck loadout and associated facilities are constructed within an existing disturbance area, this revision resulted in no new surface disturbance, and no soil material stripping was necessary. As an existing disturbance area, disturbed area runoff is already captured and controlled by the existing drainage and sediment control system. Construction of the truck loadout facilities involved excavation in the existing Tipple Coal Stockpile area for the reclaim bunker, vibratory feeder, and reclaim and escape tunnels. Other affected areas were graded, consistent with the site plan, to address drainage, construction, and operational requirements. The estimated total cut /fill volume is approximately 8,000 cy. A culvert, of the same size as the existing culvert, was installed in the existing road ditch for the future road connection. The truck loadout yard area and road were ripped, graded, compacted, and surfaced with road -base and gravel to handle anticipated truck and heavy equipment traffic. Drilled concrete piers or caissons are used to support and stabilize both the conveyor and loadout foundations. Conveyor bents are set on spread concrete footers attached to piers, and the loadout building is supported by spread footers and a floor slab tied to either concrete piers or caissons. The loadout building floor slab extends under the loading chute to provide a loading pad. The pre -cast concrete reclaim bunker is approximately 15 x 20 x 20 feet and includes a 2 x 4 x 8 foot sump to collect water from the coal feed as well as wash -down water. A 1,000 tph vibratory feeder and chutework, within . the reclaim bunker, transfers coal from the stockpile to the truck loadout reclaim conveyor. The 10 -foot diameter corrugated steel reclaim tunnel extends approximately 240 feet from the reclaim bunker to the daylight point. A 140 foot long, 42 -inch escape tube fitted with an intake fan, provides an emergency escapeway for the reclaim tunnel. The truck loadout reclaim conveyor is elevated from the tunnel daylight point to the top of the truck loadout structure (approximately 70 feet above grade). For the elevated portion, the conveyor structure is supported by steel trusses, a walkway will provide access for inspection and maintenance, belly pans protect from coal spillage, and corrugated steel arch covers provide weather protection and help to control dust. The truck loadout building and associated equipment was pre- fabricated off -site, and assembled and erected by the site contractor. The approximately 40 x 40 x 85 foot building includes a control room for truck- loading operations and an MCC building for the electrical equipment associated with the conveyor drives, pumps, reclaim tunnel ventilation fan, and other ancillary equipment. Power is provided to the facility from a transformer on the existing nearby distribution line. Minor quantities of wash -down water from both the reclaim conveyor and truck loadout drain to Pond C. Dust from transfers within the loadout building is controlled by both enclosures at the transfer points and by the enclosed building. During truck loading, dust is controlled by a telescoping extension chute with flexible dust boot, which discharges below the top of the trucks. Miscellaneous Coal Handling System Modifications Repairs to a support structure on the ROM conveyor were required after steel conveyor bents were damaged by contact with heavy equipment. Damaged structural steel was replaced/repaired and a protective concrete curb was constructed around the existing support pylons without significantly altering the existing conveyor structure. Design drawings for the repairs and protective structure are provided in Exhibit 49D. • TR06 -53 2.05 - 37.3 06/20/06