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i Draft Environmental Impact Report Page IV.F-27 Forward Inc. Landfill Expansion Within six months, with a financial commitment by Forward, municipal piped water will be brought to the NCYCC and replace the current us of the supply wells; • The two private wells will continue to be supplied with bottled water; and • Because of the potential for contamination from WMU B and/or A of the shallow groundwater table downgradient and adjacent to the project, existing domestic off-site wells within 500 feet of the eastern property boundary will be sampled at the same frequency as the monitoring wells onsite and for the same constituents (see CCR, Title 27). Final determination of the sampling program and the evaluation of the test results, 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 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. This impact would still be potentially significant. An additional mitigation measure suggested by the EIR is: 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. Implementation of these procedures and mitigation measures would reduce this impact to a less than significant level. Impact F.7:Potential decreases in groundwater resources due to loss of recharge surface area and groundwater pumping. The proposed landfilling of 185 acres of unpaved agricultural land would remove that land from rainwater recharge to local aquifers. Concurrently,the increase in landfill capacity over that currently permitted area would likely result in a greater volume of groundwater extraction. 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. Additional groundwater extraction wells proposed could remove a potentially significant groundwater volume. This long-term pumping could incrementally impact local groundwater resources. A regional groundwater recharge program is apparently being considered by San Joaquin County Flood Control District for conjunctive use. Such groundwater storage and recharge programs are designed to store excess water for recharge use during the dry summer months. Thus introduced recharge would not occur during the seasonal high groundwater of the end of the wet weather cycle and potentially cause higher than historic groundwater elevations. The impact from additional groundwater extraction and treatment could be potentially significant if not mitigated by recharging the groundwater back into the aquifer.The impact from groundwater recharge would be less than significant.