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W • Draft Supplemental Environmental Impact Report Page IV.G-17 • Forward Inc. Landfill 2018 Expansion Project • There are currently two Class II surface impoundments at the Forward Landfill: WMU F-West and WMU F-North. An additional Class II impoundment, WMU F-South, is permitted but has not yet been constructed. A Compost Pond is located in the southern portion of the site • (southern expansion area). Both Class II impoundments have 1:1 (horizontal:verticaI) slopes, • contain a sump with a side slope riser and a double liner system consisting of, from top to • bottom: • 60-mil HDPE primary geomembrane • • Geonet • • 60-mil HDPE secondary geomembrane. • • 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 Little John 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 cleaned and closed and a new • leachate evaporation pond would be constructed in the southwest corner of the expansion area. • As operations of the landfill move into the southeast corner of the site, 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 month. • 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. Historically, the pan lysimeters have been reported dry, and as a result, no water quality samples have been collected. • • 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; • • • • • •