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Draft Supplemental Environmental Impact Report Page II-27 Forward Inc. Landfill 2018 Expansion Project not properly controlled, The drainage study utilizes San Joaquin County local rainfall data, and the Significant surface water bodies Rational Method would be used to estimate maximum potential runoff from could become a 1,000-year,24-hour storm event.The surface water control system and contaminated through drainage control structures for the proposed project would be sized to contact with the landfill accommodate the calculated peak flows. refuse. As part of the design plans for the proposed landfill expansion, Forward has completed calculations of the 1000-year,24-hour storm event peak discharges.The hydraulic and drainage study would be used to design appropriate drainage controls.Drainage controls would be designed to prevent contact between surface water and refuse.Site run-on and run-off control facilities consist of drains and perimeter ditches that channel surface water to holding and evaporation ponds on the site.The surface-water collection drain system would be designed to divert the water to the onsite sedimentation basins.All waste at the proposed Forward Landfill would be separated from the North and South Branches of South Littlejohns Creek by a levee system or other acceptable method designed to protect the site from a 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.