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BACKGROUND Since the beginning of the 2014 water drought, the City of Pleasanton has participated in water policy roundtables and Tri-Valley Water Liaison Committee meetings to discuss water issues in the Tri-Valley. The Tri-Valley Water Liaison Committee consists of elected officials from Zone 7 Water Agency (Zone 7), Dublin San Ramon Services District (DSRSD), California Water Service (Cal Water), and the Cities of Dublin, Livermore, Pleasanton, and San Ramon. The recent focus of these meetings has been to explore diversification of the water supply portfolio in the Tri-Valley and to enhance long-term water supply reliability. As noted in Zone 7's Water Supply Evaluation Update completed in February 2016, potential future water supply options include California WaterFix, desalination, and potable reuse. On February 11, 2016, the Tri-Valley Water Liaison Committee discussed and supported a more detailed study of potable reuse. Zone 7 and the Tri-Valley Water Retailers (DSRSD, Cal Water, and the Cities of Livermore and Pleasanton) subsequently formed a Steering Committee with representatives from all agencies to oversee policy issues related to the study. In addition, a Project Management Committee consisting of technical staff from each agency was formed to oversee the technical work, with a designated project manager from Zone 7 and efforts to address outreach and institutional issues would be pursued separately, with the City of Livermore taking the lead on outreach and the City of Pleasanton taking the lead on institutional matters. In October of 2016, Carollo Engineers (Carollo) was hired under the Tri-Valley Intergovernmental Reciprocal Services Master Agreement to prepare the Joint Tri- Valley Potable Reuse Technical Feasibility Study. The primary goals of the Study were to evaluate the feasibility of potable reuse for the Tri-Valley; to identify and evaluate a short list of alternatives based on technical, financial, and regulatory considerations; and, assuming potable reuse was found to be feasible, to recommend next steps for the agencies. The end use options to be evaluated included groundwater augmentation and raw water augmentation via a connection upstream of the Zone 7 Water Treatment Plants. Direct connection to potable water transmission systems was not considered based on input from the elected representatives at the February 2016 meeting. DISCUSSION Study Results The Study has been completed and the Executive Summary is included as Attachment 1 and the entire Study can be found on the City of Pleasanton website at http://www.cityofpleasantonca.gov/gov/depts/os/sewer/default.asp. An overview of the Study and key findings were presented to the Tri-Valley Water Liaison Committee on March 1, 2018. The Study initially developed 21 preliminary alternatives for a potable reuse project. Through a series of workshops and consultations with the Steering Committee and the Project Management Committee, these projects were modified and narrowed down to 6 alternatives in a bookend approach. Page 3 of 6