SITE INFORMATION AND CORRESPONDENCE

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, throughout the region. The initial on-site activity will involve unloading the contaminated soil at the Unloading Ramp and depositing the material in segregated piles within the Contaminated Storage Area. The Unloading Ramp will be equipped to wash down the transport trucks prior to leaving the site. The Contaminated Soil Storage Area is constructed so that the bottom is sealed and the sides are bermed to contain any leachate. The piles of contaminated soil are covered to control dust, odors, exposure of the material to weather and preventing hydrocarbons from escaping into the atmosphere. The storage capacity of the Storage Area is approximately 10,000 tons. It is anticipated the average storage time for contaminated soil will be 14 days, with a maximum storage time of 60 days. 2 . Leachate and Runoff Collection and Pretreatment System Wash down water at the Unloading Ramp and storm water runoff from the contaminated soil stockpile will be collected by a sump and pipe system for pretreatment prior to discharge into the city of Stockton municipal sewage system. The pretreatment system consists of a settling tank, an oil- water separator, and a dual carbon bed filter. The pre- treatment system is capable of processing up to 7 , 200 gal- lons per day. 3 . Circulating Bed Combuster (CBC) System Prior to treatment, the contaminated soil is pretreated in the tent structure located in the southwest corner of the Contaminated Soil Stockpile area. This pretreatment con- sists of mechanically screening the material and/or size reduction of the material to prepare it for thermal heating. The tent structure is designed to contain fugitive dust and odors. The SSTF project proposes to utilize two CBC units, each capable of processing up to 7 tons of material per day. The CBC units are proposed to operate 24 hours per day (two 12 hour shifts) , and to operate 310 days per year. The remain- der of the year is set aside for planned maintenance and normal repair activities. The pretreated contaminated soil is transported by conveyor belt from the tent structure to one of the CBC units for processing. The CBC unit is an advanced fluidized bed combuster that uses high-velocity air to entrain circulating solids in a highly turbulent combustion loop. Upon entering the CBC, the contaminated soils are rapidly heated using natural gas burners and exposed to high temperatures ( 1450 deg F to 1600 deg F) . The main components of the CBC system include: - combustion chamber - cyclone/return leg - flue gas cooler - fabric filter baghouse. 3