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Draft Supplemental Environmental Impact Report Page II-25 Forward Inc. Landfill 2018 Expansion Project 100-year flood event. • The project includes channel reconfiguration and localized flood protection berms to isolate the landfill surfaces from floodwaters. • The project design shall also include provision of replacement floodplain area and storage volume in an easement along the relocated South Branch of South Littlejohns Creek. • The channel and floodplain storage easement are designed to accommodate the 100-year,24-hour storm. The design would also include a three-foot freeboard. All of these measures have been incorporated into the design of the landfill expansion and relocated South Branch channel. Therefore,potential surface water drainage impacts would be reduced to a less than significant level. F.2. Uncontrolled Proposed as Part of the Project. Less than erosion from soil Significant stockpiles and landfill • The current drainage control structures and monitoring would continue to be surfaces, or inadvertent implemented to control erosion and sedimentation in the expansion areas. spills of refuse or other Proposed structural controls include the drainage control system and daily substances onsite, could cover. Operational controls include maintenance of the drainage system by contaminate surface keeping ditches clear of debris and excessive vegetation, and making needed water. repairs to drainage structures. Corrective measures would be implemented if inspections show excessive erosion or damage to drainage channels. Any areas showing erosive effects would be mitigated by removing loose debris followed by replacement, regrading, and compacting the area. Monitoring and protection against sediment from entering the Littlejohns Creek channel would be implemented, including the diversion of part of Littlejohns Creek farther away from the landfilled area. • In order to minimize sediment transport to Littlejohns Creek,landfill slopes,