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Draft Supplemental Environmental Impact Report Page III-20 Forward Inc.Landfill 2014 Expansion Project alternative daily cover(ADC). Inert materials such as concrete, rock, and asphalt are used for wet-weather roads and drainage improvements. Wood and yard waste are processed and used for ADC. E. EXISTING LANDFILL OPERATIONS Existing operations at the Forward Landfill are described in III.E Existing Landfill Operations, pages 111-16 to III-26 of the 2013 Forward Landfill Expansion Final Environmental Impact Report(FEIR), and reproduced below. No substantial changes to existing operations at the landfill have occurred since the 2013 FEIR was prepared,with the exception of installation of an improved tire washing system at the site's main driveway, discussed under Dust,below, the land application of cannery wastes, and the start of operation of the Ameresco Landfill Gas to Energy plant, described under Air Quality Control,below. In the 2013 EIR, the tire washing system was described as part of the previously proposed project, and the Ameresco Landfill Gas to Energy plant was described as permitted but not constructed. 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 FRRF. 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 J 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