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River Islands Development at Lathrop January 2021 FINAL River Islands Non-Potable Water Technical Report Rev 2 #6520 List of Figures Figure 4-1: River Islands Non-Potable Water Distribution System Schematic...........................................17 Figure 4-2: River Islands NPW Distribution Areas Exhibit..........................................................................18 Figure 5-1: River Islands Non-Potable Water Distribution Model — Phase I and II Peak Irrigation Demands (8-hr)— Headloss Gradient— 16 and 8-inch NPW Mains— P Street..........................................................21 Figure 5-2: River Islands Non-Potable Water Distribution Model — Phase I and II Peak Irrigation Demands (8-hr)— Pipe Velocities................................................................................................................................23 Figure 5-3: River Islands Non-Potable Water Distribution Model — Phase I and II Peak Irrigation Demands (8-hr)— Pipe Headloss Gradients ...............................................................................................................24 Figure 5-4: River Islands Non-Potable Water Distribution Model — Phase I and II Peak Irrigation Demands (8-hr)— Pressures.......................................................................................................................................25 List of Tables Table 2-1: Gross (Total) Non-Potable Water Irrigation Areas— Phase I ......................................................7 Table 2-2: Net Non-Potable Water Percent Irrigation Areas— Phase I ........................................................8 Table 2-3: Net Non-Potable Water Irrigation Areas— Phase 1......................................................................8 Table 2-4: Net Non-Potable Water Irrigation Percentage and Areas— Phase II ..........................................9 Table 2-5: Net Non-Potable Water Irrigation Areas— Phase I and 11............................................................9 Table 3-1: Peak Month Daily Irrigation Demand Factor Over 8 Hours.......................................................11 Table 3-2: Peak Month Daily Irrigation Demand Factor Over 8 Hours.......................................................12 Table 3-3: Main Pump Station Irrigation Skid — Firm Pumping Capacity....................................................13 Table 3-4: Proposed Phase II NPW Pump Stations— Firm Pumping Capacity..........................................14 Table 5-1: Steady State Analysis Results— Peak Month Irrigation Demands............................................22 Table 6-1: Preliminary River Islands Construction Schedule &Associated Net NPW Irrigation Area........27 Table 6-2: Preliminary River Islands Construction Schedule &Associated Peak Month Irrigation Demands over Daily 8-Hour Irrigation Window...........................................................................................................27 Table 6-3: Minimum Preliminary Improvement Implementation Schedule .................................................28 Appendices: Appendix A—Stage 1A, 1 B, 2A, and 2B Irrigation Coverage Exhibits Appendix B— Phase I Land Use Exhibit Appendix C—CIMIS Station 70 Historical Precipitation and Evapotranspiration Data Appendix D— Peak Irrigation Demand Calculation Appendix E - Phase 11 Lotting Summary Exhibit Appendix F - Phase II NPW and RW Preliminary Utility Exhibit Appendix G - Pages from 2017 River Islands Main Pump Station Plans Appendix H — Preliminary Phase II NPW Irrigation Map 3