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Draft Supplemental Environmental Impact Report Page II-22 <br /> Forward Inc. Landfill 2014 Expansion Project <br /> berms to isolate the landfill surfaces from floodwaters. <br /> • The project design shall also include provision of replacement floodplain <br /> area and storage volume in an easement along the relocated Littlejohns <br /> Creek. <br /> • The channel and floodplain storage easement are designed to accommodate <br /> the 100-year, 24-hour storm. The design would also include a three-foot <br /> freeboard. <br /> • As required by the regulations, the surface water management system will <br /> be designed and stamped by a Registered Professional Engineer in the State <br /> of California. In addition,both the RWQCB and CalRecycle will review the <br /> surface water management system design as part of issuance of WDRs and <br /> the SWFP, respectively. These procedures would reduce potential surface <br /> water drainage impacts to a less than significant level. <br /> F.2. Uncontrolled Proposed as Part of the Project: Less than <br /> erosion from soil The current drainage control structures and monitoring would continue to be Significant <br /> stockpiles and landfill implemented to control erosion and sedimentation in the expansion areas. <br /> surfaces, or inadvertent Proposed structural controls include the drainage control system and daily <br /> spills of refuse or other cover. Operational controls include maintenance of the drainage system by <br /> substances onsite, could keeping ditches clear of debris and excessive vegetation, and making needed <br /> contaminate surface repairs to drainage structures. Corrective measures would be implemented <br /> water. if inspections show excessive erosion or damage to drainage channels. Any <br /> areas showing erosive effects would be mitigated by removing loose debris <br /> followed by replacement, regrading, and compacting the area. Monitoring <br /> and protection against sediment from entering the Little John's Creek <br /> channel would be implemented, including the diversion of part of Littlejohns <br /> Creek farther away from the landfilled 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 /> • As required by State regulations, the erosion controls stem will be designed <br />