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Draft Supplemental Environmental Impact Report Page III-14 Forward Inc. Landfill 2014 Expansion Project Existing Waste Management Units and Facilities The existing Forward Landfill consists of a number of Waste Management Units (WMUs), as shown on Figure III.0-3. The labeling of the WMUs has occurred in conjunction with site development. The existing Forward Landfill includes the approximately 123-acre original disposal areas of the former Austin Road Sanitary Landfill, which,unlike more recently constructed areas of the landfill, does not contain a base liner or leachate collection and removal system (LCRS). Figure III.0-7 shows typical cross-sections of the liner, the leachate collection trenches and pipes, and final cover. The first WMU established at the original Forward Landfill was an approximately 8-acre Class I6 disposal area labeled WMU A, located on the eastern side of the site, near the main entrance facility. Hazardous and designated wastes, consisting primarily of industrial plant process waste, were disposed of in WMU A from 1979 through 1984, and the unit was closed in 1989. J WMUs B and B-North are Class III units encompassing a combined area of approximately 15 acres. The waste in WMU B consists primarily of nonhazardous solid wastes, while WMU B-North contains inert wastes. WMUs B and B-North began operations in the late 1970s. WMU B-North is temporarily inactive and WMU B is near capacity. WMU C, an approximately 4-acre Class III unit, overlies the south end of WMU A. Because WMU A is a Class I unit, a compacted clay dike was constructed in the north end to separate the hazardous WMU A wastes from the nonhazardous WMU C wastes. In 1994, the western portion of the waste in WMU C was overlain by a liner and LCRS, and municipal solid waste and designated wastes were placed over the liner. Only municipal solid waste and not designated wastes were placed over the portions not underlain by an interface liner and LCRS. WMU D comprises a significant portion of the area north of the South Fork of South Littlejohns Creek. Operating WMUs in this area are permitted to receive designated wastes, and were constructed to meet Class II regulatory requirements for base liners and LCRSs. WMU E is an ash fill, also known as the Eastern Ash Disposal Pit, was constructed in 1987 at — 4 acres and was expanded to 6 acres in 1992. A liner was placed over the northern,eastern, and western sides of WMU E in 1999 and 2000 to separate the ash from designated waste that would be placed above it. A final cover was placed on the south side in 1999. _ WMU F North, constructed in 1999, is an approximately 1-acre leachate?impoundment located just north of the South Branch on the western side of the site. The leachate impoundment was s The former City of Stockton's Austin Road Sanitary Landfill(now the northern portion of the current Forward Landfill)consisted of a total of 410 acres,as mentioned above. The 410 total acres included various non-disposal uses,as well as the original disposal area of 123 acres. 6 Hazardous(Class I)wastes are defined by California law,and include wastes specifically listed because s of their known hazardous natures,and wastes that show any of the characteristics of a hazardous waste (ignitability, corrosivity, reactivity,and toxicity). Designated(Class II)wastes are defined as nonhazardous wastes that contain pollutants that could be released in excess of water quality objectives - or could cause degradation of waters,or hazardous wastes that have been granted a variance by the California Department of Toxic Substances Control(DTSC)to be disposed in a Class II unit. Class III waste is nonhazardous Municipal Solid Waste. 7 Leachate is the liquid that drains or'leaches'from a landfill. It varies in composition depending on the age of the landfill and the type of waste that it contains,but usually contains both dissolved and suspended material and may contain various contaminants.