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Draft Supplemental Environmental Impact Report Page II-24 <br /> Forward Inc. Landfill 2018 Expansion Project <br /> by the VOC- <br /> contaminated <br /> groundwater plume. <br /> E.B. Emissions of air Less than Significant. None required. Less than <br /> toxics could pose a risk Significant <br /> to human health. <br /> F. HYDROLOGY AND <br /> WATER QUALITY3 <br /> F.1. If rainfall runoff was Proposed as Part of the Project. Less than <br /> not properly controlled, Significant <br /> surface water bodies <br /> • The drainage study utilizes San Joaquin County local rainfall data, and the <br /> could become Rational Method would be used to estimate maximum potential runoff from <br /> contaminated through a 1,000-year,24-hour storm event. The surface water control system and <br /> contact with the landfill drainage control structures for the proposed project would be sized to <br /> accommodate the calculated peak flows. <br /> refuse. <br /> • As part of the design plans for the proposed landfill expansion,Forward has <br /> completed calculations of the 1000-year, 24-hour storm event peak <br /> discharges. The hydraulic and drainage study would be used to design <br /> appropriate drainage controls.Drainage controls would be designed to <br /> prevent contact between surface water and refuse. Site run-on and run-off <br /> control facilities consist of drains and perimeter ditches that channel surface <br /> water to holding and evaporation ponds on the site. The surface-water <br /> collection drain system would be designed to divert the water to the onsite <br /> sedimentation basins. All waste at the proposed Forward Landfill would be <br /> separated from the North and South Branches of South Littlejohns Creek by <br /> a levee system or other acceptable method designed to protect the site from a <br /> s Note—In this SEIR's Hydrology and Water Quality Chapter,these impacts and mitigation measures are numbered"G._"for document organizational purposes <br />