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r r t r r __, r r r r r r r r I Draft Supplemental Environmental Impact Report Page 11-21 Forward Inc.Landfill 2014 Expansion Project landfill may be affected by the VOC- contaminated groundwater plume. E.B.Emissions of air Less than Significant. None required. Less than toxics could pose a risk Significant to human health. F.HYDROLOGY AND WATER QUALITY F.1.If rainfall runoff was Proposed as Part of the Project. Less than not properly controlled, Significant surface water bodies An updated JTD by the applicant would be completed to include a permit- could become level drainage study for the proposed expansion. The drainage study would contaminated through utilize San Joaquin County local rainfall data, and the Rational Method to contact with the landfill estimate maximum potential runoff from a 1,000-year,24-hour storm event. refuse. The surface water control system and drainage control structures for the proposed project would be sized to accommodate the calculated peak flows. • As part of the design plans for the proposed landfill,Forward would complete permit-level 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 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