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Draft.Environmental Impact Report Page II-21 Forward Inc. Landfill Expansion the responsibility of the RWQCB and must be carried out under their permit authorization;and • The groundwater capture and remediation system will be augmented to capture the current offsite plume to the satisfaction of the RWQCB based on their review of the current Source Control Report before them and other forthcoming reports. Identified in This EIR: Mitigation Measure F.6:Water quality at the offsite wells, such as the two private wells along Austin Road and the CYACC wells, shall be monitored quarterly to determine effectiveness of the new extraction system to be installed, currently being reviewed by the RWQCB. Continued operation of the augmented groundwater extraction system at the site would help limit the contaminant plume from expanding further downgradient but would not address the offsite component potentially beyond the reach of the newly proposed wells, such as the affected NCYCC wells. The NCYCC and the other offsite private wells would only likely achieve the WQOs through long-term attenuation and dilution over time. F.7. Potential decreases Identified in This EIR: Less than in groundwater Significant resources due to loss of Mitigation Measure F.7: Two infiltration methods are currently used at the landfill. recharge surface area and The groundwater currently pumped by the former agricultural well is used onsite;thus, groundwater pumping some of it will infiltrate through the unlined parts of the site and migrate back to the groundwater aquifer from where it was extracted. Secondly, the treated groundwater from the groundwater extraction system is discharged into the infiltration basin, which recharges aquifers below and moves offsite. Treated groundwater from the groundwater extraction system is infiltrated back to the aquifer through an infiltration basin located near well MW-11. This has resulted in a dilution of the previous concentrations at M W-11 but and may have bifurcated the plume between a northern and northeastern component but has not mitigated the plume from further downgradient. More changes to the current infiltration system and groundwater extraction is currently being reviewed by the applicant.The RWQCB is currently reviewing a Source Control Report by the applicant to address the need for