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the October 31, 1990, letter from S]CPHS to Forward. <br /> The contaminated soil treatment system consists of an area where appropriate <br /> fertilizers are added to the contaminated soil and the soil is mechanically <br /> aerated to accelerate biodegradation of hydrocarbons (bioremediation process). <br /> The objective of the treatment process is to biodegrade the hydrocarbons to <br /> levels appropriate for landfilling. After the contaminated soils have been <br /> adequately treated, the soil can be used for daily cover, intermediate cover, or <br /> foundation layer for the closure cap. If necessary, the treated soils can be <br /> disposed in a <br /> Class II or Class III WMU. <br /> Although there are currently no Land Treatment Units (LTUs) at the site, LTUs <br /> have been constructed in the past and may be utilized in the future. LTUs for <br /> contaminated soil are permitted within WMU G-North or G-South. The units are <br /> approximately 40 feet wide by 500 feet long. The number of operating LTUs at <br /> any given time will vary according to the market need for the soil treatment <br /> process. Previously constructed LTUs have consisted of a 40-mil polyvinyl <br /> chloride (PVC) liner covered with a 6-inch-minimum thickness layer of sand and <br /> gravel, an 18-inch minimum thickness layer of compacted clay, and a 6-inch- <br /> minimum thickness layer of a sand and gravel buffer zone. A layer of <br /> contaminated soil approximately 18 inches thick is placed within each LTU for <br /> treatment. <br /> Berms contain stormwater within the LTUs, and a drainage system removes <br /> stormwater that accumulates. The surfaces of the LTUs will be sloped so that <br /> excess rainwater drains to a storage tank. Water stored in the tank will be <br /> used for soil moisture control during the treatment process or pumped to the <br /> leachate evaporation pond. <br /> A monitoring system has been designed to test the soils to ensure the <br /> efficiency of hydrocarbon biodegradation. Soils in the LTUs will be sampled <br /> regularly to evaluate and manage the key treatment parameters such as soil <br /> moisture, soil pH, soil nutrient levels, and air temperature. Following <br /> treatment, the soil will be analyzed to determine if the petroleum hydrocarbon <br /> concentration meets the level acceptable for use as alternative cover or <br /> foundation material, or disposal. <br /> Forward Landfill)TD 6-13 <br /> L:\Allied\2000.193\Reports\finaljtd:Sec-6.0 6-9-03:5/22/02 <br /> Rev. 1: 7/2002: Rev. 2: 4/2003; Rev 3: 6/2003 <br />