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Consolidated Forward . _. Landfill Page 14 The operator will remove any hazardous materials spotted during delivery, thus minimizing the potential for leachate -con ta mirLation if a break occurs in the liner or the leachate collection system. A double liner shall be installed urxi-r the sump area, as required by the RWQCB; Electric testing of the liner in each Waste Management Unit shall be conducted before waste can be disposed in that Unit, as required by the RWQCB; and Identified in This EM: If any modifications to the leachate collection system and associated monitoring described in the JTD are required the RWQCB, The landfill operator shall implement those changes. 47 (F.4) Proposed as Part of the Project: Proposed measures to address concerns about additional leachate generation as a result of the combined landfill have been addres---&d in the JTD with the presentation of the EPA HELP model results based on the projected volumes of refuse, 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 currently under review at the RWQCB. Reporting on leachate generation volume and quality is a requirement of the RWQCB-stipulated progress reporting through the various proposed landfilling phases. IrAWk The landfill cell anchor trenches will be elevated two to three feet above the surrounding land to minimize the possibility of Rater from major storm events draining into the cells and adding to the volume of leachate. Identified in This EIR: Continued monitoring of the effectivmess of mitigation measures for leachate shall be performed by the responsible regulatory agencies (currently the RWQCB and, for the WMU- A, the DTSC). These agencies keep abreast of state-of-the-art information on leachate generation mechanisms andmitigation. if, in the future, monitoring demonstrates that the procedures above were insufficient to mitigate the effects of landfill -generated . leachate, the agencies will, as appropriate, require additional mitigation measures. 48 (F.5) Proposed as Part of the Project: Maximum pre -loaded settlement of the combined landfill is projected in the JTD to provide the maximum period for settlement and take advantage of anticipated improvements in geosynthetic technology. Future design for the vertical etp}xaaasion will, if necessary, include additional components in the liner system, depending on fbn= differential settlement on the liner system. The extraction wells proposed as pert of the Revised Engineering Feasibility Study (AEE, 200113) will be maintained and monitored during combined landfill build -out phases, and modified as needed based on the RWQCB's review of monitoring data.