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4.0 WASTE MANAGEMENT UNITS 4.1 EXISTING AND PLANNED FACILITIES The Forward Landfill facility consists of waste management units (WMUs), a transfer station/materials recovery facility, soil borrow areas, composting areas, and storage and support areas. Future permitted facilities will include additional WMUs, a wildlife preserve and floodplain and relocation of existing scales/scale house. Potential facilities that may also be constructed-include,entrance and administration facilities and a temporary hazardous materials storage locker. 4.1.1 PERMITTED WASTE MANAGEMENT UNITS Existing Units The existing Forward Landfill consists of several WMUs, as shown on Figure 9. The labeling of the WMUs has occurred in co qunction.with,site, ,velopment, but is somewhat complicated by several overlapping units. The first WMU established at the Forward Landfill was an approximately 8-acre area labeled WMU A. WMU A is located on the eastern side of the site, near the main entrance facility. The unit consists of four trenches constructed in a:,raorth to south orientation, with a compacted clay liner and dendritic LCRS in each trench. Hazardous and designated wastes, consisting primarily=,o+plant pm+ ss waste, were disposed of in WMU A from 1979 through 1984. The unit was closed in 1989 and hasreceivedpostclosure permits from both the RWQCB and DTSC. WMUs B and B-North are Class III landfills 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 Trench 4 in WMU A. Because WMU A is a Class I unit, a compacted clay dike was Forward Landfill JTD 4-1 L•\AII ied\2000.193\Reports\fina Ij td:Sec-4.0.doc:08/20/01 BRYAN A.STIRRAT S ASSOCIATES