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Section 1: Introduction Water Supply Alternatives Study <br />1-4 <br />DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the end of this document. <br />Water Supply Alternatives Study-Draft Report.docx <br />1.3.2 Zone 7 Coordination <br />BC and City staff coordinated with Zone 7 management and staff throughout the Study. Zone 7 staff <br />provided BC well data and a copy of its existing groundwater flow and transport model. As described <br />in Appendix D, BC used this existing model in evaluating scenarios as part of the Study. The model <br />was used without modification to determine the potential impact on groundwater quality from the <br />existing PFAS plume in the upper and lower aquifers of the Livermore Valley groundwater basin <br />around the City. <br />BC and City staff held meetings with Zone 7 management and staff on April 11, 2023, and June 13, <br />2023. Discussions during those meetings focused on potential water supply options considered in <br />the Study that could involve Zone 7. In addition, the City and Zone 7 communicated throughout the <br />Study to exchange information. <br />1.3.3 Evaluation Approach <br />The Study involved a multi-step process for identifying and evaluating potential water supply <br />alternatives, as shown in Figure 1-2. The outcomes from the evaluation are presented in the <br />following sections, with further detail on the methodology included in Appendix A.