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r Draft Supplemental Environmental Impact Report Page IV.G-16 Forward Inc. Landfill 2018 Expansion Project As part of the proposed expansion,WMU F-North would be clean closed and a new leachate evaporation pond would be constructed in the southwest corner of the expansion area.An additional leachate evaporation pond would be constructed in the current entrance facility area. Required leachate monitoring consists of dam-weekly inspections of the system and sumps for the presence of leachate. If leachate is present, the sumps are pumped and the leachate is disposed. Leachate detected in a previously dry sump is sampled and that sump is added to the semi-annual sampling program.The leachate samples are analyzed for the constituents and parameters listed in the site's WDRs, and include the field parameters discussed in the surface water monitoring.The quantity and quality of leachate pumped from each sump is measured and reported to the RWQCB in gallons per day. Monitoring devices are also in place beneath the sumps of the leachate collection system to detect if there is leakage through the leachate collection system.These pan lysimeter monitoring devices are sampled and tested for constituents of concern, including VOCs, as required by the RWQCB. rImpacts and Mitigation Standards of Significance According to CEQA Guidelines, the proposed project could have a significant impact with regard to hydrology and water quality if it would: • Substantially degrade water quality; • Contaminate a public water supply; • Substantially degrade or deplete groundwater resources; • Substantially interfere with groundwater recharge; • Cause flooding or subject structures to flood hazards; r Substantially modify a local or regional drainage feature (i.e., creek alignment); • Cause significant erosion or sedimentation; r • Generate more leachate than can be handle by the existing or planned control systems;or • Cause or be subject to substantial flooding,erosion, or siltation. As described in the Project Description, State and Federal standards have been established for the siting, design, construction, operation, closure, and post-closure of Class II landfills. Similarly,the closed Class I landfill has post-closure monitoring and maintenance requirements. These standards incorporate state-of-the-art engineering requirements that are intended to reduce the risks associated with waste disposal facilities to an acceptable level. An inconsistency between the proposed project and regulations related to surface or groundwater hydrology and water quality also would have the potential to result in significant impacts. r r r