SUPPLEMENTAL MATERIAL - Laserfiche WebLink

THE CITY OF 4ia��Iwwd PLEASANTON Date: November 19, 2024 To Mayor and City Council From: Gerry Beaudin, City Manager N_ Siew-Chin Yeong, Director of Public Works Subject: Supplemental Material for the November 19, 2024, Agenda Report, Item 11, Approve Amendment No. 1 to Agreement between the City of Pleasanton and Zone 7 Water Agency to perform Phase I Feasibility review for the Regional Groundwater Facilities Project for a revised total not -to -exceed amount of $2,733,178 In November 2022, the City ceased operating Wells 5 and 6 (Well 8 was taken out of service in 2019) due to detectable PFAS concentrations as determined by new regulatory requirements. Since then, the City has been purchasing 100% of its water supply from Zone 7. Concurrently, the City was engaged in a detailed water supply alternatives study to ensure long-term water sustainability and reliability, from which the City Council approved (in October 2023) a preferred alternative to pursue two new wells to replace the City's groundwater production quota of 3,500-acre feet that was unavailable after taking the wells offline. The City Council's approval also included the evaluation of a potential partnership with Zone 7 for a joint wells project. Regional Groundwater Feasibility Study To date, the City and Zone 7 have initiated Phase 1 of the Regional Groundwater Facilities Project, which undertakes a feasibility study based on installing test wells to collect water samples and hydraulic data. Zone 7, as the regional groundwater management agency, is leading this effort, leveraging its expertise in water quality, aquifer studies, and groundwater production, with the City as a partner agency. The feasibility study aims to provide critical data on groundwater reliability, production capacity, and treatment requirements. Based on Zone 7's assessment, the test wells will have minimal impact or no significant impact on the groundwater basin storage or water quality as these are smaller diameter wells with temporary pumps to be operated for testing purposes for a short duration. Test wells are essential for determining the feasibility of production wells, potential yields, water quality conditions and cost share for each agency. No final decision to drill permanent wells has yet been made; on completion of the feasibility study, the findings and recommendations will be presented to the City Council and the Zone 7 Board of Directors to guide data -driven decisions regarding the feasibility of permanent wells for the City and the region.