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Draft Supplemental Environmental Impact Report Page IV.G-19 Forward Inc. Landfill 2018 Expansion Project Impact G.3: Potential groundwater impacts could result if the proposed liners and leachate collection systems for the Landfill expansion areas were not properly designed or installed, or if they were to fail. Without a properly designed landfill cell liner and LCRS installed in the project expansion areas,landfill leachate could percolate through the ground underlying the landfill units and potentially contaminate groundwater. To address this potential,the expansion areas would have a leachate collection system installed that will meet the federal and state Class II landfill design requirements. The following groundwater quality protection measures are proposed as part of the project: (as required under CCR Title 27) • A pan lysimeter(secondary liner)would be installed under the sump area, as previously required by the RWQCB; • The liner and leachate collection system for the two new expansion areas would meet Title 27 requirements and be reviewed and approved by the RWQCB and new WDRs issued, as warranted; • The regulatory required separation between the liner and groundwater shall be implemented to allow for chemicals in the leachate to attenuate before reaching the groundwater, should the leachate breach the liner and leachate collection system; • Leak location testing of the liner in each WMU shall be conducted before waste can be disposed in that Unit, as required by the RWQCB; • If any modifications to the leachate collection system and associated monitoring are required by the RWQCB,the landfill operator shall implement those changes; • The liner system will be overlain by a protective operations layer consisting of a one-foot thickness of soil and a one-foot thick gravel layer that serves as the leachate collection layer. This two-foot layer will serve to protect the liner system from sharp or jagged materials in the waste. • The operator will remove any hazardous materials spotted during delivery, thus minimizing the potential for leachate impacts to groundwater if a break occurs in the liner or the leachate collection system. • Landfill operations and maintenance are designed with appropriate schedules to identify and correct any failures in the leachate collection system. In addition, the RWQCB will review the updated Joint Technical Document(JTD), the leachate collection system, and associated monitoring, and could require changes to the planned leachate collection system or monitoring. Implementation of the described protection measures,long-term operations and maintenance procedures, obtaining new RWQCB Waste Discharge Requirements, and compliance with RWQCB orders would reduce the impact to a less-than-significant level.