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Draft Supplemental Environmental Impact Report Page II-24 Forward Inc. Landfill 2018 Expansion Project 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 The drainage study utilizes San Joaquin County local rainfall data, and the could become Rational Method would be used to estimate maximum potential runoff from contaminated through a 1,000-year, 24-hour storm event. The surface water control system and contact with the landfill drainage control structures for the proposed project would be sized to refuse. accommodate the calculated peak flows. • 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 Littlejohn Creek by a levee system or other acceptable method designed to protect the site from a 100-year flood event. Note—In this SEIR's Hydrology and Water Quality Chapter,these impacts and mitigation measures are numbered"G.—"for document organizational purposes • 4000 * so 00000 * 0000 • • 0 • • • 0 * 04000000004100400000 . 4