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<br /> i Zone 7 Water Agency <br />December, 2025 <br /> <br />TABLE OF CONTENTS TABLE OF CONTENTS <br />Executive Summary ....................................................................................................................................... 1 <br />1. Introduction .............................................................................................................................................. 1 <br />1.1. Background ........................................................................................................................................ 1 <br />1.2. Purpose .............................................................................................................................................. 3 <br />1.3. Approach to Study ............................................................................................................................. 3 <br />1.4. Zone 7 / City of Pleasanton Coordination ......................................................................................... 3 <br />2. Groundwater Supply ................................................................................................................................. 5 <br />2.1. Hydrogeologic Setting ....................................................................................................................... 5 <br />2.1.1. Water Quality ............................................................................................................................. 5 <br />PFAS Assessment ............................................................................................................................. 6 <br />2.1.2. Groundwater Production Rates ................................................................................................. 6 <br />2.1.3. Well Pump Sizing ........................................................................................................................ 8 <br />2.2. Modeling of Future Groundwater Levels .......................................................................................... 8 <br />3. Project Alternatives Overview ................................................................................................................ 10 <br />3.1. Initial Screening of Project Alternatives .......................................................................................... 10 <br />3.2. Project Alternatives ......................................................................................................................... 11 <br />3.2.1. Alternative 1 – Tennis Park Well .............................................................................................. 11 <br />3.2.2. Alternative 2 – Tennis and Hansen Park Wells ......................................................................... 12 <br />3.2.3. Alternative 3 – Tennis and Del Prado Park Wells ..................................................................... 12 <br />3.2.4. Alternative 4 – Tennis, Hansen, and Del Prado Park Wells ...................................................... 12 <br />3.3. Project Alternative Production Rates .............................................................................................. 17 <br />3.4. Cost Estimates ................................................................................................................................. 19 <br />3.4.1. Capital Costs ............................................................................................................................. 19 <br />3.4.2. Annual Costs ............................................................................................................................. 20 <br />3.4.3. Cost Summary .......................................................................................................................... 21 <br />4. Project Alternatives Evaluation ............................................................................................................... 22 <br />4.1. Evaluation Overview ........................................................................................................................ 22 <br />4.1.1. Evaluation Criteria .................................................................................................................... 22 <br />4.1.2. Weighting Criteria .................................................................................................................... 24 <br />4.1.3. Scoring Criteria ......................................................................................................................... 25 <br />4.1.4. Ranking Methodology .............................................................................................................. 26 <br />4.2. Evaluation Results............................................................................................................................ 27 <br />5. Recommended Project and Next Steps .................................................................................................. 30 <br />6. Basis Of Design And Future Treatment Considerations .......................................................................... 33 <br />7. References .............................................................................................................................................. 35