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Draft Supplemental Environmental Impact Report Page III-16 Forward Inc.Landfill 2018 Expansion Project D.EXISTING LANDFILL CONDITIONS Existing conditions at the Forward Landfill are described in IIID Existing Landfill Conditions, pages III-10 to III-16 of the 2013 Forward Landfill Expansion Final Environmental Impact Report(FEIR), and are reproduced below, along with a discussion of Waste Management Unit (WMU)FU-17, created since the 2013 EIR was prepared. With the exception of WMU FU-17 and application of cannery waste, discussed under Permitted Waste Stream and G. Recent Projects at the Forward Landfill,below,no substantial changes have occurred to existing conditions at the landfill since the 2013 FEIR was prepared(see Figures III.0-2 and III.0-3). 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 area'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 I'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. 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. 6 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. 7 Hazardous(Class I)wastes are defined by California law,and include wastes specifically listed because 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. r