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Mayor Thorne commented on the importance of making sure the community is aware of what the City is doing. He spoke positively about the TMP and about the importance of public input. Mayor Thorne called for a break at 8:50 p.m. The meeting was reconvened at 8:55 p.m. with all Members present. 19. Presentation on the Joint Tri-Valley Potable Reuse Technical Feasibility Study Director of Operations and Water Utilities Kathleen Yurchak introduced new Utilities Planning Manager Todd Yamello and provided a brief overview of the project to date. She displayed a PowerPoint Presentation addressing Background including Tri-Valley Actions, formation of the Liaison Committee and its support of a potable reuse study; Tri-Valley Collaboration, City Council 2017/2018 Work Plan Priority and results of the March 2018 Liaison Committee Meeting. She deferred to Carollo Engineers for further presentations. Lydia Holmes, Carollo Engineers, presented details of the Joint Tri-Valley Potable Reuse Technical Feasibility Study addressing its Primary Goals and the Status of Regulations for "Potable Reuse" in California, noting Potable reuse uses multiple barriers for reliable purification to assure protection of public health. She added an engineered storage buffer will allow time to monitor water quality. In response to Councilmember Pentin's question regarding the time allowed to monitor water quality, Ms. Holmes reported the regulations are currently under development on different projects, her company has proposed different amounts, and for this project, the cost estimate was generated at two hours. She added there is online monitoring that would cause an automatic stop if any problems show up. Councilmember Brown reported people have reported hormones getting through the system and asked at what point hormones would be blocked through the process. Ms. Holmes reported hormones fall under the Contaminants of Emerging Concern and noted the processes to address those items. Ms. Holmes addressed alternatives analysis used to develop the shortlist/bookends and sources evaluated to consider potential lowest and highest purified water supply yields. In response to Councilmember Brown's question regarding storage of water, Ms. Holmes reported because there is flow available when there is no irrigation demand, the water could be stored for use during the summer months, but there are no places to build storage facilities and it is expensive. Instead, they are building facilities that will only be run during winter months. Councilmember Olson asked whether this reduces the amount of fluid LAVWMA needs to pump over the hill and Ms. Holmes responded affirmatively. Ms. Holmes continued with the presentation, noting alternatives use different combinations of sources, sites and end uses and detailing each. She addressed details of the six short-listed alternatives resulting from the alternatives analysis including locations, end uses, yields, project costs and unit costs, and a Qualitative Comparison of Alternatives. She addressed a Summary of Study Findings and reported they did not conduct a rate study, however there was a quick analysis that considered a potential $10 - $15 increase in monthly water bills. Ms. Holmes presented Technical Next Steps and stated there needs to be an update in the water supply planning document to consider the different options. Additionally, there is a need to take a better look at demands in the valley, and there are additional technical evaluations that could be conducted to narrow the project by type of end use. She recommended the City implement an independent advisory panel, which validates the process for the public. City Council Minutes Page 8 of 11 May 15, 2018