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t Draft Environmental Impac Report Page III-12 Forward Inc. Landfill Expansion Forward Landfill uses certain waste materials ink beneficial r use,pr gram subject.to -ifapproval and supervision of the-Sa,n Joaquin County-Public Healt4r. ervic Envi7o-n ental3 dielth-Division(SJPHS) which acts as Local Enforcement Agency (LEA) for the California integrated Waste Management Board(CIWMB), materials such as treated automobile shredder waste are substituted for"virgin' materials used as alternative daily cover (ADC). Inert materials such as concrete, rock, and asphalt are used for wet-weather roads and drainage improvements. Limited amounts of wood and yard waste are processed and used for ADC. E. EXISTING LANDFILL OPERATIONS Waste Handling and Screening Procedures Landfill Operation The existing Forward Landfill is constructed by the "area fill" method. Under this method,the waste cells are approximately 150 feet wide, and refuse is placed in lifts 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,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 appropriatevc_ustorimers with recyclable-or_salvageable# items are-dir—ccfed-to-the MRF" 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 b 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 Although most contaminated soils accepted at the existing Forward Landfill are disposed directly into Class II WMUs, Forward,4lnc may,occa-s--ionally temporarily,Stockpile or-treat-I certain contaminated moil's. Soils that are temporarily stockpiled are typically those that have been received at the site without the required analytical testing documentation. The soils are stockpiled until the generator provides the necessary documentation. Once the documentation is received and depending on the test results, the soils are either disposed in an appropriate WMU or removed from the site by the generator. From 2002-2007, there has been one disposal and removal occurrence. (Bryan A.Stirrat & Associates, 2007). 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