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'-~ ~ + • <br />T880144 <br />using natural gas within the combustion chamber of the kiln. The natural gas will also <br />be utilized as a backup fuel source for the kiln. The shale is introduced into the kiln <br />at the opposite end of the kiln's combustion chamber. Within the kiln the material is <br />dried and heated to approximately 2000°F at which point it undergoes a volumetric <br />expansion. The expansion, loss of moisture, and the surface hardening which occurs at <br />2000°F results in a lightweight, durable aggregate material. After firing, the material <br />dischargers from the kiln into a reciprocating grate cooler which cools the product ag- <br />gregate to approximately 150°F using forced air. The forced air, after passing through <br />the bed of hot aggregate, is diverted so that approximately one-half of the heated air <br />enters the combustion chamber of the kiln and the remaining lower temperature air goes <br />to a fabric filter collector to remove particulates prior to exhausting to the atmosphere. <br />After the finished product discharges from the grate cooler, it is separated into various <br />sizes using vibrating screens. A portion of the product stream is crushed to make a <br />product suitable for use as an aggregate for the manufacture of concrete block. The <br />screened coarse aggregate (3/q' x 3/g') is conveyed to outside storage, whereas the <br />finer sizes are conveyed to the enclosed product silos for storage. <br />The coarse aggregate stored outside in piles will be transferred to trucks with front end <br />loaders as sales warrant. Sales of the finer sizes of aggregate will require trucks be <br />loaded by telescoping chutes from beneath the product silos. <br />It is not anticipated that the project would produce any industrial wastewater or any <br />hazardous materials. Used crankcase oil from quarrying equipment would be properly <br />stored on-site until there is sufficient quantity for transfer and sale to a recycling firm <br />for refinin;; and reuse. Non-hazardous solid waste (paper products, shipping and packing <br />materials, scrap lumber, etc.) would be contained on-site and periodically transported to <br />a Jefferson County landfill by a commercial refuse disposal service. It is estimated that <br />10 to 20 cubic yards of non-hazardous solid waste would be produced per week during <br />construction, and 5 to 10 cubic yards would be produced per week during operation. <br />-3- <br />Hydro-Sea~rch, II1C. HYDROLOGISTS-GEOLOGISTS-ENGINEERS <br />