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Draft Supplemental Environmental Impact Report Page II-27 Forward Inc. Landfill 2018 Expansion Project 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 and 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 F.4. If not properly Proposed as Part of the Project: Less than managed,the volume of The proposed measures to address concerns about additional leachate Significant leachate generated from the expansion areas generation as a result of the expanded landfill will be addressed in the JTD with could result in potential the presentation of the updated EPA HELP model results based on the projected groundwater impacts. 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 have been presented in the JTD, 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 2 to 3 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. Implementation of these procedures would reduce the impact to a less-than- significant level.