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reliability were the Delta Conveyance (previously referred to as the California Water Fix), regional desalination, potable reuse, the Sites Reservoir, water transfers, and water storage with the expansion of the Los Vaqueros Reservoir. The 2014-16 drought created the emphasis on self- sufficiency as the City only received 5% of its requested allocation from the State Water Project at the drought's height. She reported the TVWLC supported a more detailed study of potable reuse in February 2016 with Council approving a Task Order in October 2016. She noted the Council prioritized Potable Reuse Study in 2017 in collaboration with regional agencies for 2018. The joint study was completed in May 2018 demonstrated potable reuse is technically feasible. Council authorized staff to coordinate with TVWLC to explore additional uses of potable reuse technologies, and periodically update the Council. Council prioritized the continuation of the work plan for 2019-20, allocating $300,000 in Capital Improvement Program No. 18151 to fund the studies. Zone 7 reaffirmed the need to pursue options to enhance the area's long-term supply reliability in 2019 and noted public outreach and water supply studies are ongoing. Director Yurchak reported that since determining potable reuse was feasible, the supply and technical investigation studies have been ongoing, but a decision needs to be made. She advised the options are to either eliminate the City's continued participation with the regional agencies on the potable reuse studies and reallocate funds towards Per- and Polyfluorinated Substances (PFAS) treatment or make no changes. In response to Councilmember Balch's inquiries, Director Yurchak clarified during the 2014-16 drought Zone 7's allotment fluctuated from nearly 0% up to 5% of its regular allocation which typically averages 10% and that Zone 7 receives 2% of the State Water Project supply overall. In response to Councilmember Balch's inquiries, Director Yurchak clarified PFAS was unknown when the 2016-18 Feasibility Study was conducted. She advised some of the upcoming studies could investigate how injecting water into the groundwater could affect PFAS in Pleasanton's groundwater basin. She confirmed hydrology would be studied further to see how PFAS infiltrates the groundwater. She confirmed all the other TVWLC agencies have funded their portion of the studies other than the California Water Service. She added the California Water Service was not unexpected among the other agencies because it has less flexibility in funding local projects. Lastly, she confirmed Pleasanton was represented by Mayor Brown and Councilmember Narum at the 2019 TVWLC meeting which approved the potable reuse studies, and the Council was unanimous in its support of those studies. In response to Vice Mayor Testa's inquiry, Director Yurchak confirmed potable reuse is the costliest water supply option based on the 2018 study. She explained what makes potable reuse unique is the City has local control over the supply whereas Delta Conveyance is part of the State Water Project. She advised desalination requires having seawater piped in and noted Sites Reservoir would be another infrastructure project. She noted Zone 7 has taken the lead in the other studies, but the Potable Reuse Study was specific to the Tri-Valley because of the local water supply source. In response to Vice Mayor Testa's inquiry, Director Yurchak clarified the intent of the community outreach is to discuss the water supply challenges facing the Tri-Valley and to educate the community about those challenges during dry years. In response to Councilmember Narum's inquiries, Director Yurchak confirmed some of the studies will look at the use of recycled water through Livermore's and DSRSD's wastewater treatment plants. She commented that with the emergence of PFAS regulators are looking at Pleasanton's wastewater treatment facilities and PFAS's impact on groundwater sources. She added DSRSD's data is just starting to come in and Livermore has not been required to do testing and sampling yet. City Council Minutes Page 4 of 12 February 2, 2021