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Draft Supplemental Environmental Impact Report Page II-28 <br /> Forward Inc. Landfill 2018 Expansion Project <br /> F.2. Uncontrolled erosion Proposed as Part of the Project. Less than <br /> from soil stockpiles and The current drainage control structures and monitoring would continue to Significant <br /> landfill surfaces, or be implemented to control erosion and sedimentation in the expansion <br /> inadvertent spills of areas. Proposed structural controls include the drainage control system and <br /> refuse or other substances daily cover. Operational controls include maintenance of the drainage <br /> onsite, could contaminate system by keeping ditches clear of debris and excessive vegetation, and <br /> surface water. making needed repairs to drainage structures. Corrective measures would <br /> be implemented if inspections show excessive erosion or damage to <br /> drainage channels. Any areas showing erosive effects would be mitigated <br /> by removing loose debris followed by replacement, regrading, and <br /> compacting the area. Monitoring and protection against sediment from <br /> entering the Littlejohns Creek channel would be implemented, including <br /> the diversion of part of Littlejohns Creek farther away from the landfilled <br /> area. <br /> • In order to minimize sediment transport to Littlejohns Creek, landfill slopes, <br /> ridge tops, and peripheral areas would be revegetated to inhibit erosion. <br /> F.3. Groundwater Proposed as Part of the Project(required under CCR Title 27} Less t an <br /> contamination would • Significant <br /> A pan lysimeter(secondary liner)would be installed under the sump area, <br /> result if the leachate as previously required by the RWQCB; <br /> collection systems for the <br /> expansion areas fail. The liner and leachate collection system for the two new expansion areas <br /> would meet Title 27 requirements and be reviewed and approved by the <br /> RWQCB and new WDRs issued,as warranted; <br /> • The regulatory required separation between the liner and groundwater shall <br /> be implemented to allow for chemicals in the leachate to attenuate before <br /> reaching the groundwater, should the leachate breach the liner and leachate <br /> collection system; <br /> • Leak location testing of the liner in each WMU shall be conducted before <br />