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4-1 40 4.0 WASTE MANAGEMENT UNITS 4.1 Existing Facilities The Forward Landfill facility consists of WMUs, a RRF, an entrance facilities area, scales and scalehouses, a landfill gas flare station, water production wells, a groundwater extraction and treatment facility, sedimentation basins, and storage and support areas (i.e., office trailer and maintenance buildings), as well as a hazardous materials storage locker. Future permitted facilities will include additional WMUs, a wildlife preserve and floodplain, and relocation of existing scales/scalehouse. It should be noted that the LFGTE facility (i.e., the former Covanta plant) was shut down as of October 23, 2012. SJVAPCD has cancelled its associated operating permits (see Appendix B). Additional information on the new LFGTE facility is included in Section 7.5.1.1. 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 conjunction with site development, and has several overlapping units. The first WMU established at the original Forward Landfill was an approximately 8 -acre Class disposal 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 north to south orientation, with a compacted clay liner and dendritic LCRS in each trench. Hazardous and designated wastes, consisting primarily of plant process waste, were disposed of in WMU A from 1979 through 1984. The unit was closed in 1989 and has received post -closure permits from both the RWQCB and DTSC. 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 and construction debris. WMUs B and B -North began operations in the late 197Os. WMU B -North has been inactive since 1986 and WMU B is inactive as well. WMU C, an approximately 4 -acre Class III unit, overlies the south end of in WMU A. Since WMU A is a Class I unit, a compacted clay dike was constructed along the north end of the cell to separate the WMU A hazardous wastes from the WMU C nonhazardous wastes. Operations began in WMU C in 1984. In 1994, the western portion of the waste in WMU C was overlain by a liner and LCRS. Municipal solid waste and designated wastes were placed over these liner/LCRS components. Municipal solid waste was placed over the portions not underlain by the liner and LCRS. Forward Landfill SWT Engineering Joint Technical Document - April 2014 zAprojects\allied waste\forward\five year permit rvw 2013\jtd-5 yr pr 2013\text\sec 4_final.dou