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Contaminated soils are exposed to high temperatures and <br /> turbulence for up to 30 minutes by circulating the material <br /> in the combustion loop which consists of the combustion <br /> chamber, cyclone and return leg. The high combustion air <br /> velocity and circulating solids result in a uniform tempera- <br /> ture around this combustion loop resulting in the rapid <br /> heating of the material and highly efficient combustion. <br /> The resulting flue gases are treated in the process as <br /> required and cooled by the flue gas cooler to temperatures <br /> suitable for operation of the fabric filter baghouse where <br /> particulate matter is removed. The baghouse physically <br /> separates the particulate matter from the flue gas similar <br /> to a vacuum cleaner bag, prior to discharge to the atmos- <br /> phere from the exhaust stack. <br /> During the operation, treated soil is periodically removed <br /> from the CBC and transported to the Treated Soil Storage <br /> Building by a mechanical conveyor. For a detailed descrip- <br /> tion of the CBC process , please refer to pages 16-20 and <br /> Chapter 5 of the Report of Station Information. A CBC <br /> layout drawing, an isometric drawing of the CBC unit , and a <br /> schematic drawing of the system are presented at the end of <br /> this section. <br /> 4 . Treated Soil Storage <br /> The treated soil (also called ash) , is conveyored to a <br /> Treated Soil Storage Building for temporary storage. Within <br /> this building, the soil is moistened by water spray nozzles <br /> to control fugitive dust. After remaining in the building <br /> for 24 hours , the treated soil is transported by bucket <br /> loaders to a stockpile area where it is covered with tarpau- <br /> lins and stored prior to shipment off-site. Prior to ship- <br /> ment, the soil is tested to confirm that the treated soil is <br /> inert . The Treated Soil Stockpile has a capacity of approx- <br /> imately 5, 500 tons, which is the volume of material that can <br /> be processed by the two CBC units in a 14 day period. <br /> 5 . Administration and Control Area <br /> This segment of the project site houses the office building, <br /> the control room for the CBC units , a maintenance building, <br /> and staff/employee space. <br /> s s s s s <br /> 4 <br />