COMPLIANCE INFO_FINAL WMU FU-23 DESIGN RPT & CONCURRENCE LTRS

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WMU FINAL WMU FU-23 DESIGN REPORT 2-18-23 1-1 SECTION 1 Introduction The Forward Landfill is an active, permitted Class II and Class III disposal facility that is owned and operated by Forward, Inc. (Forward), a subsidiary of Republic Services. The landfill is located approximately seven (7) miles southeast of the City of Stockton in San Joaquin County. This report presents the design and construction documents for the development of Waste Management Unit (WMU) FU-23 at the Forward Landfill. WMU FU-23 is east of WMUs FU-17 and 19. The location of WMU FU-23 is shown on the Site Plan (see the Construction Drawings in Appendix A). The design and construction documents for WMU FU-23 were prepared in accordance with Forward's approved Joint Technical Document (JTD), Waste Discharge Requirements (WDR Order No. R5-2014-0006), and applicable regulations. The applicable state regulations include California Code of Regulations (CCR), Title 27, Division 2 (Title 27). The federal regulations are incorporated in 40 Code of Federal Regulations (CFR), Parts 257 and 258 (Subtitle D). Some of the provisions of particular importance regarding the design include: • The WMU FU-23 liner and leachate collection and removal system (LCRS) design conform to the prescriptive standards of both Title 27 and Subtitle D. • Seismic studies have indicated that the Forward Landfill site is not located within 200 feet of a Holocene aged fault (GeoSyntec, January 2001) and therefore complies with the regulatory provision regarding active faults. The liner will encompass approximately 4.5-acres and will extend approximately 200 feet in the east- west dimension, although the southern portion of WMU FU-23 connects with WMU FU-19 and is approximately 540-ft. The north-south dimension is approximately 680 feet. The top of clay liner on the base of WMU FU-23 will be at approximately elevation 2-foot to 8-feet, which is about 32 to 38- feet below the native ground surface on the south side of the WMU. A composite lining system consisting of a 2-foot-thick clay liner overlain by a 60-mil, high-density polyethylene (HDPE) geomembrane, and LCRS consisting of 1 foot of granular drainage material will be constructed on the WMU FU-23 base. The base liner of WMU FU-23 is sloped to drain at a minimum one percent grade to the east. Two temporary sumps with HDPE tanks will be constructed on the eastern edge of the WMU FU-23 base. Leachate will be pumped from the tanks and routed to the onsite Class II leachate ponds.