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Forward Inc. Landfill Expansion Project MMRP • 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(TTD), the leachate collection system, and associated monitoring, and could require changes to the planned leachate collection system or monitoring. 57. Proposed as Part of the Project: • The proposed measures to address concerns about additional leachate generation as a result of ' the expanded landfill will be addressed in the JTD with the presentation of the updated EPA HELP model results based on the projected volumes of refuse, a historical analyses of actual leachate generation volumes(which were at significantly higher volumes than the model predicted for peak year rainfall)and the description of the leachate collection system ' designed to meet the maximum probable leachate generated. Engineering control systems (leachate collection system,drainage control,groundwater and gas controls),monitoring programs, and institutional controls will be similar to the successful systems that have been presented in the JTD for the existing Forward Landfill,which has been reviewed by the RWQCB. Reporting on leachate generation volume and quality is a requirement of the RWQCB-stipulated progress reporting through the various proposed landfilling phases. ' • The landfill cell anchor trenches would be elevated two to three feet above the surrounding land to minimize the possibility of water from major storm events draining into the cells and adding to the volume of leachate. 58. Proposed as Part of the Project The following measures are proposed as part of the project, as described in the Project Description ' and design study for the proposed creek realignment: I Page 18