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Forward Inc. Landfill Expansion Project MMRP all ashes which are dumped are damp. Active faces need to have a certain moisture content so as to preclude the generation of dust. It is recognized that a balance must be struck between maintaining sufficient moisture for dust control and applying too much moisture such that the generation of excess leachate occurs. The conditions at the active faces of a ' landfill as well as the leachate generated, shall be monitored and professional judgment utilized at all times to keep these two factors in balance. F.HYDROLOGYAND WATER QUALITY 54. Proposed as Part of the Project: • The drainage study utilizes San Joaquin County local rainfall data,and the Rational Method would be used to estimate maximum potential runoff from a 1,000-year,24-hour storm event. 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 expansion,Forward will complete 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 nun-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. • Channel design features are proposed as part of the expansion project: 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. 55. Proposed as Part of the Project: • The current drainage control structures and monitoring would continue to be implemented to ' control erosion and sedimentation in the expansion areas. Proposed structural controls include the drainage control system and daily cover. Operational controls include maintenance of the drainage system by keeping ditches clear of debris and excessive vegetation, and making needed repairs to drainage structures. Corrective measures would be implemented if inspections show excessive erosion or damage to drainage channels. Any areas showing erosive effects would be mitigated by removing loose debris followed by replacement,regrading, and compacting the area. Monitoring and protection against sediment from entering the Little John's Creek channel would be implemented, including the diversion of part of Littlejohns Creek farther away from the landfilled area. • In order to minimize sediment transport to Littlejohns Creek, landfill slopes, ridge tops, and peripheral areas would be revegetated to inhibit erosion. 56. Proposed as Part of the Project: The following groundwater quality protection measures are proposed as part of the project: (as required under CCR Title 27) Page 17