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• • Draft Supplemental Environmental Impact Report Page IV.G-23 • Forward Inc. Landfill 2018 Expansion Project • • Forward Landfill has agreed to a short-term and long-term mitigation of the offsite impacts of the VOC plume,providing of mitigation water to residence in the downgradient area who's domestic wells are still adversely affected by the VOC plume. The long-term solution, • with a financial commitment by Forward, is that all affected property owners in the • footprint of the downgradient plume will have municipal piped water will be brought in to • replace the current use of the supply wells; • • The residences would continue to be supplied with bottled water until municipal piped • water is provided; • • Because of the potential for impact from the plume to the downgradient receptors • determination of the sampling program frequency and any changes to it, along with the • appropriate mitigation, is the responsibility of the RWQCB and must be carried out under their permit authorization; and • • The groundwater capture and remediation system could be augmented to capture the current offsite plume to the satisfaction of the RWQCB based on their review of future • source control reports. Implementation of these procedures and protections would reduce the impact to a less-than- significant level. • Mitigation Measure G.6: None required. Impact G.7: Potential decreases in groundwater resources due to loss of recharge surface area. • The proposed landfilling over the currently unpaved land in the expansion areas would remove that land from rainwater recharge to local aquifers, resulting in a loss of recharge. As discussed in the setting section,groundwater resources in the Central Valley have historically suffered • from overdrafting—where more groundwater is removed than is naturally recharged into the aquifers. • A regional groundwater recharge program is being considered by San Joaquin County Flood • Control District and Water Conservation District (SJCFCWCD)for conjunctive use. Such • groundwater storage and recharge programs are designed to store excess water for recharge use • during the dry summer months. This introduced recharge would not occur during the seasonal high groundwater of the end of the wet weather cycle, and would not result in groundwater • elevations that would be higher than historic levels. The following measures are proposed as part of the project: • • Continued recharge of extracted and treated groundwater. In the GeoLogic 2017 Corrective Action Monitoring Workplan the construction of a storage basin for treatment system effluent that would subsequently infiltrate and recharge the groundwater is proposed. • Although the recharge program does not specifically address the loss of infiltration within the expansion area it is designed to generally meet the intent of the water district to • minimize overdrafting. • • • • •