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INFORMATION SHEET ORDER NO. R5-2010-0016 SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS NORTH COUNTY LANDFILL SAN JOAQUIN COUNTY Background The North County Landfill is an active, Class III, municipal solid waste (MSW) landfill on East Harney Lane near Atkins Road, approximately nine miles east of Lodi. The landfill has been in operation since 1991, accepting primarily household and commercial wastes. The 320-acre site includes the existing landfill, a materials recovery facility, wetlands area, and a future landfill development area. The landfill currently consists of three waste disposal modules - M1, M3, and M4, covering an area of about 53 acres. Other landfill facilities include storm water drainage systems; leachate collection systems; landfill gas controls; monitoring systems; access roads; maintenance facilities; an office and scale house; pump station; and other facilities. Approximately 400 tons per day (144,000 tons per year) of wastes, including MSW, commercial wastes, and construction and demolition debris were discharged to the landfill in 2008. Approximately 5.3 million cubic yards of waste are estimated to be in place at the landfill. Development Plans An additional 132 acres (the remainder of the landfill unit area) are planned for future landfill development. Seven additional modules (M5 through M11) will be constructed in phases for a total of 11 modules at build-out. Development will proceed module-by-module on an as needed basis. The Discharger currently estimates that Module M5 will be constructed in 2012. In addition to lateral expansion, the Discharger is proposing a vertical expansion over existing and future modules to increase landfill capacity. The maximum elevation of fill, including cover, would increase from 190 feet MSL to 320 feet MSL and total landfill capacity would increase from about 20.9 million cubic yards to about 36.9 million cubic yards. The maximum thickness of the fill, including cover, would increase to 148 feet (Module 1) and 254 feet (future modules). Landfill Design Module 1 was constructed in 1991 with a pre-Subtitle D containment system consisting of a single 60 mil HDPE liner and geonet blanket LCRS and collection piping. Module 3 was constructed in 1995 with a similar LCRS, but a single composite liner meeting Subtitle D and Title 27 requirements. Module 4 was constructed in 2004 in accordance with a liner performance demonstration and engineered alternative design (EAD) approved under previous WDRs (Order No. R5-2002-0219). The approved EAD included a single composite liner similar to Module 4, but with a gravel LCRS blanket. The Discharger plans to construct future modules consistent with existing approvals for Module 4, or as separately proposed and approved by the Board. Specific designs and construction plans will be submitted for approval as each module is proposed for development.