PC-2026-15 - Laserfiche WebLink

ARROYO LAGO RESIDENTIAL PROJECT ADDENDUM 142 FCS Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480036/Addendum/21480036 Arroyo Lago Residential Project Addendum.docx explained that Zone 7—designated by the California Department of Water Resources as the Groundwater Sustainability Agency for this medium-priority basin—has an Alternative GSP approved by the State, showing the basin has operated within sustainable yield for more than a decade. The County Project’s groundwater demands and on-site well plans fall within the parameters evaluated in the Alternative GSP, meaning no undesirable results (such as significant depletion or degradation) are anticipated, and therefore the County Project was considered consistent with the sustainability objectives established under SGMA. Furthermore, the WWTP would be designed and required to produce disinfected tertiary recycled water per Title 22 standards and be regulated during operations under Water Reclamation Requirements (Order WQ 2016-0068-DDW). A Notice of Intent would be filed with the RWQCB for Waste Discharge Requirements (WDRs), further ensuring consistency with applicable water quality plans. Therefore, the Prior FEIR concluded that impacts would be less than significant. (Draft EIR, pp. 3.9-34, 6-16). Proposed Project Analysis and Conclusion As described in the Prior FEIR, the RWQCB has established regulatory standards and objectives for water quality in its Basin Plan. Consistent with the analysis of the Prior FEIR, the proposed project would not conflict with the Basin Plan or the County’s NPDES program. Given that proposed construction would disturb more than 1 acre of land, the proposed project would be required to comply with the terms of the Construction General Permit, which require the preparation and implementation of a SWPPP that includes BMPs to ensure reduction of pollutants from construction activities potentially entering surface waters. Therefore, consistent with the impact conclusions in the Prior FEIR, construction impacts related to a water quality control plan or groundwater management plan consistency would be less than significant. As described above, any groundwater used by the City to serve the proposed project comes from the Livermore Valley Groundwater Basin through contracts with Zone 7, which is considered a medium- priority groundwater basin. While the City previously obtained a portion of its supply from City-owned groundwater wells, those wells are no longer in operation. The City is actively evaluating future supply alternatives, including potential joint groundwater wells in coordination with Zone 7; however, at present, all water supplies are purchased from Zone 7. The Basin is regulated under SGMA, and the preparation and implementation of a GSP is required. Adherence to the objectives and sustainability goals provided in the GSP would reduce impacts to groundwater quality within the City. Thus, the proposed project would not interfere substantially with groundwater supply. Furthermore, the proposed project would not include the construction of the WWTP included under the County Project, further reducing the potential for any significant impacts. Therefore, impacts related to sustainable groundwater management would be less than significant. Therefore, the proposed project would not introduce new significant impacts or create substantially more severe significant impacts than those previously identified in the Prior FEIR. No additional analysis is required.