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(24) Clean and Raw Coal Silos <br />• These cylindrical vertical concrete silos, resting on concrete footer <br />foundations, are used to store clean and raw coal. The 102-foot tall, <br />42-inch diameter structures are completely enclosed, thus there is no <br />access to the coal inside. They hydraulically-activated chute on the <br />clean coal silo is normally closed, and the bay where trucks fill up <br />with coal has electrically-operated lockable doors. The raw coal silo <br />has lockable steel plate doors. No dust dispersion occurs because the <br />units are completely enclosed and the coal stored there contains a <br />minimum of 5 percent surface moisture, <br />(25) Wash Plant <br />This building houses coal processing equipment and the coal analysis <br />laboratory. The wash plant was enlarged on the south side and on top <br />of the plant during summer, 1980, to increase the handling capacity of <br />the coal processing facility. Present dimensions are 86 feet, 9 <br />• inches in height by 66-feet in length by 60 feet in width. The system <br />uses centrifugal dryers, and the building is eompletely enclosed to <br />prevent dispersion of dust pollution to the environment. Water <br />leaving the facility is piped in a closed water system to the upper <br />and lower settling ponds via 6-inch schedule 40 pipe. Fire <br />extinguishers are located on each level of the multi-level structure. <br />(26) Coarse Refuse Bin <br />This refuse bin is identical to the one described in Item 14, except <br />that it is smaller in size (13' x 13' x 20' high). The bin is <br />equipped with a "full" indicator light, and the conveyor carrying <br />refuse to the bin is equipped with a spray bar. In addition, coal and <br />refuse that leave the coal processing plant consist of a minimum of 5 <br />percent surface moisture, minimizing threat of dust dispersion. <br />• <br />4-11 <br />