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Draft Supplemental Environmental Impact Report Page III-24 Forward Inc.Landfill 2018 Expansion Project Waste Handling and Screening Procedures Landfill Operation The existing Forward Landfill is constructed by the"area fill"method. Under this method,each lift of refuse is approximately 150 feet wide and up to 20 feet high. Waste placed during the day is covered with soil and/or an approved Alternative Daily cover(ADC),which is then compacted by a dozer or compactor to complete the cell. Forward Landfill uses synthetic tarps,preprocessed treated automobile shredder waste,processed green material,ash and cement kiln dust,and shredded tires as ADC. As refuse is being unloaded,landfill staff inspects the loads for recyclable or prohibited materials. Unacceptable waste identified by landfill staff is separated for proper treatment and disposal,or rejected and returned to the customer. As appropriate,customers with recyclable or salvageable items are directed to the RRF. To achieve adequate waste compaction,the active working face is sloped at approximately 3:1 (horizontal:vertical)or flatter. The working face is covered daily with at least 6 inches of cover soil or a permitted alternative daily cover material. The top surface and sides of the advancing lift are covered with a layer of soil at least one foot thick when wastes are not scheduled to be placed there within 180 days. Land Treatment Units and Treatment of Contaminated Soil Contaminated soils accepted at the existing Forward Landfill are disposed directly into Class II WMUs as regulated by the RWQCB. The RWQCB sets parameters for the acceptance of contaminated soils, as articulated in the site's Waste Discharge Requirements. The contaminated soils that can be accepted at the Forward Landfill are considered non-hazardous in accordance with state and federal regulations. All contaminated soils that are accepted at Forward have been approved prior to arriving at the site based on analytical testing documentation. In the past, Forward has implemented programs for treating both gasoline and nonvolatile petroleum hydrocarbon contaminated soil, as described below. The contaminated soil treatment system consists of an area where appropriate fertilizers are added to the contaminated soil and the soil is mechanically aerated to accelerate biodegradation of hydrocarbons (bioremediation process). The objective of the treatment process is to biodegrade the hydrocarbons to levels appropriate for landfilling. After the contaminated soils have been adequately treated,the soil can be used for daily cover, intermediate cover,or foundation layer for the closure cap. If necessary,the treated soils can be disposed in a Class II or Class III WMU. Although there are currently no Land Treatment Units(LTUs) at the site, LTUs have been constructed in the past and may be utilized in the future. A LTU is an area constructed with a liner,berm, stormwater collection system, and monitoring system, in which a layer of contaminated soil is placed for treatment. LTUs for contaminated soil are permitted within WMU G-North or G-South. These treatment units may also be used to treat other nonvolatile