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Draft Supplemental Environmental Impact Report Page IV.G-16 Forward Inc. Landfill 2018 Expansion Project • Geosynthetic clay liner (GCL) • Prepared subgrade WMU F-North was constructed in 1999 and is an approximately 1.3-acre triangular-shaped impoundment located just north of the South Branch of the South Fork of LittleJohns Creek. WMU F-West was constructed in 2003 and is an approximately 0.97-acre rectangular-shaped impoundment located directly west of WMU FU-03. 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 daily 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. Impacts 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; • Substantially modify a local or regional drainage feature (i.e., creek alignment); • Cause significant erosion or sedimentation; • 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.