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Draft Supplemental Environmental Impact Report Page IV.G-19 ' Forward Inc. Landfill 2018 Expansion Project • 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 J� 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. Impact GA If not properly managed,the volume of leachate generated from the expansion areas could result in potential groundwater impacts. More refuse would be generated by the expanded landfill than would be under the existing landfill operating permit, so that there is a potential for more leachate to be produced over time given the additional 8.12 million cubic yards (CY)of landfilling covered by the expansion.The base liner system design would be required to be in compliance with the current WDRs for the existing facilities and in accordance with 27 CCR,Section 20330 requirements for a Class II liner system. ' Spacing of LCRS lateral pipes and headers was evaluated by HELP2 leachate generation modeling, and modified by the higher historical indications of leachate volume. Leachate would ' be collected and discharged to the new onsite leachate ponds in addition to the existing ponds. If during the service life of the landfill,the demand on the leachate impoundment exceeds capacity,Forward would implement an alternative leachate management plan. Leachate in ' excess of the impoundment's capacity would either be pumped to temporary onsite tanks,