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Draft Supplemental Environmental Impact Report Page II-28 Forward Inc. Landfill 2018 Expansion Project F. 5: The re-routing of Proposed as Part of the Project: Less than the South Branch of The following measures are proposed as part of the project, as described in the Significant South Littlejohns Creek Project Description and design study for the proposed creek realignment: could result in flooding if the new alignment is not • The channel must function as a natural corridor,require little or no maintenance designed to accommo- once the vegetation is established, and should provide 100-year flood protection. date peak flows. • The channel slope and depth will be appropriate to the 100-year flood protection. The channel slope and depth are based on the invert elevations of the existing channel at the start and end of the new channel. The slope between these two points along this alignment is designed for 0.00055 ft/ft which translates into a ground surface profile along the alignment a channel depth between 10 and 12 feet. • The appropriate responsible agencies must review and approve the updated April 2018 design for the relocation of the South Branch of South Littlejohns Creek. Implementation of these procedures would reduce the impact to a less-than- significant level. F.6. Adding significant Proposed as Part of the Project. Less than new landfill volume Significant could potentially Forward Landfill has agreed to a short-term and long-term mitigation of the contribute to the known offsite impacts of the existing VOC plume,to provide an alternative source of VOC-contaminated drinking water to those residents in the downgradient area who are using domestic water wells for drinking water and whose domestic wells may be plume and other adversely affected by the VOC plume. A long-term solution currently being groundwater contamination. investigated by Forward to assist those residents on Newcastle Road,who are already being provided with bottled drinking water by Forward, is for Forward to provide the property owners on Newcastle Road in the footprint of the downgradient plume with municipal piped water to replace the current use of the supply wells;