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City of Pleasanton Final Water Supply Assessment Stoneridge Drive Specific Plan Amendment and Staples Ranch Project Table of Contents TABLE OF CONTENTS Table of Contents ii List of Tables List of Figures iii Acronyms iv 1.0 Introduction 1 -1 2.0 Project Overview 2 -2 2.1 Project Location 2 -2 2.2 Project Description 2 -2 2.3 Document Structure 2-2 3.0 City of Pleasanton Information and Staples Ranch Land Use Designation 3 -1 3.1 City of Pleasanton Population and Community 3 -1 3.2 Local Land Use Designations 3 -1 3.2.1 Existing General Plan Land Use and Zoning Designations 3 -1 4.0 Water Supply Planning 4-1 4.1 Water Supply Planning Under SB 610 and SB 221 4 -1 4.1.1 is the Project Subject to CEQA 4-2 4.1.2 "Is It a Project Under SB 610? 4 -2 4.1.3 "Is There a Public Water System 4-3 4.1.4 "Is There a Current UWMP That Accounts for the Project Demand? 4-3 4.1.5 Is groundwater a component of the supplies for the project?' 4-4 4.1.6 Are There Sufficient Supplies to Serve the Project Over the Next Twenty Years 4-4 5.0 Water Agency Background 5-1 5.1 Zone 7 Water Service Area 5-1 5.1.1 Water Treatment and Capacity 5-3 5.2 City of Pleasanton Service Area and Water System 5 -3 5.3 Water Supply Setting 5-3 5.3.1 Climate 5-3 5.3.2 Supply Sources 5-6 5.3.3 Zone 7 Water Supplies 5-6 5.3.4 Local Groundwater 5-6 5.4 Cawelo Water Storage District 5 -15 5.5 Zone 7 Supply Reliability in Single and Multiple Dry Years 5-16 5.6 City of Pleasanton Water Supply 5 -17 6.0 Demands 6-1 6.1 Regional Demands 6-1 6.1.1 Regional Historical and Projected Demands 6-1 PAProissle wna+411I2m%WuRon* INEINFIrafinel Wswu." ii