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DRAFT [TENTATIVE] WASTE DISCHARGE REQUIREMENTS ORDER R5-2023-OOXX 23 FORWARD, INC. FORWARD LANDFILL SAN JOAQUIN COUNTY Discharges from the groundwater extraction system are regulated by WDR Order R5-2003-0080 for the discharge of treated groundwater. Unit Construction 72. Liners for new Class II WMUs (landfills and surface impoundments) must be designed and constructed to contain fluids (e.g., leachate, waste and landfill gas condensate), to prevent the migration of waste to adjacent geologic materials, groundwater and surface water (see Title 27, section 20310 subdiv. (a), 20330 subdiv. (a)). 73. Liners for new Class III WMUs (landfills) must be designed and constructed to contain fluids (e.g., leachate, waste and landfill gas condensate), so as to be capable of preventing degradation of groundwater and surface water, even with inadequate site characteristics (see Title 27, section 20310 subdiv. (c), 20330 subdiv. (a)). 74. General water quality monitoring and system requirements (Title 27, section 20415 subdiv. (e)(6)) require initial background sampling for each unit. At minimum, the Discharger needs to collect analytical data obtained during the quarterly sampling of all the Background Monitoring Points for a period of one year. For a new unit, this data shall be collected before waste is discharged at the unit and background soil-pore liquid data shall be collected from beneath the unit before the unit is constructed. 75. The Central Valley Water Board is authorized to approve an engineered alternative to Title 27 prescriptive standards (see, e.g., Title 27, section 20330, subdiv. (c)), provided that the discharger demonstrates that compliance with the prescriptive standard would be unreasonably and unnecessarily burdensome in comparison to the proposed alternative. (Title 27, section 20080, subdiv. (b), (c); State Water Board Resolution 93-62). 76. A Liner Performance Demonstration for a Single Composite Liner (GLA, 2002) was submitted to and approved by the Central Valley Regional Water Quality Control Board (CVRWQCB) for final determination of the existing base liner design. Future landfill modules shall have an engineered alternative base and side slope outlined in Attachment E, which is incorporated herein. 77. The Discharger submitted Construction Plans for the construction of new WMUs at the Facility, specifically the Infill Expansion Area located within the proposed WMU H unit and Future FU unit, which incorporate an engineered alternative outlined in Finding 75. 78. The Discharger proposes to construct new Class II surface impoundments (WMU F East and WMU F South, see Table 1) as needed to contain and evaporate