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Draft Supplemental Environmental Impact Report Page I1-30 <br /> Forward Inc. Landfill 2018 Expansion Project <br /> for peak year rainfall and the description oft e leachate collection system <br /> designed to meet the maximum probable leachate generated. Engineering <br /> control systems(leachate collection system, drainage control,groundwater and <br /> gas controls),monitoring programs,and institutional controls have been <br /> presented in the JTD,which has been reviewed by the RWQCB. Reporting on <br /> leachate generation volume and quality is a requirement of the RWQCB- <br /> stipulated progress reporting through the various proposed landfilling phases. <br /> • The landfill cell anchor trenches would be elevated 2 to 3 feet above the <br /> surrounding land to minimize the possibility of water from major storm events <br /> draining into the cells and adding to the volume of leachate. <br /> Implementation of these procedures would reduce the impact to a less-than- <br /> significant level. <br /> F.5: The re-routing of the Proposed as Part of the Project. Less than <br /> South Branch of South The following measures are proposed as part of the project,as described in the Significant <br /> Littlejohns Creek could Project Description and design study for the proposed creek realignment: <br /> result in flooding if the <br /> new alignment is not • The channel must function as a natural corridor, require little or no <br /> designed to accommo- maintenance once the vegetation is established, and should provide 100-year <br /> date peak flows. flood protection. <br /> • The channel slope and depth will be appropriate to the 100-year flood <br /> protection.The channel slope and depth are based on the invert elevations of <br /> the existing channel at the start and end of the new channel.The slope between <br /> these two points along this alignment is designed for 0.00055 ft/ft which <br /> translates into a ground surface profile along the alignment a channel depth <br /> between 10 and 12 feet. <br /> • The appropriate responsible agencies must review and approve the updated <br /> April 2018 design for the relocation of the South Branch of South Littlejohns <br />