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River Islands Development at Lathrop January 2021 Final River Islands Potable Water Technical Report—Rev 3 #6520 List of Figures Figure 4-1: River Islands Potable Water Distribution System Schematic...................................................18 Figure 4-2: Proposed Preliminary Phase II PW Storage and Booster Pump Station Site Plan..................25 Figure 5-1: Phase I & II Overall Potable Water Distribution System...........................................................27 Figure 5-2: Phase I & II Steady State Analysis Results: Average Day Demands— Pipe Velocities...........28 Figure 5-3: Phase I & II Steady State Analysis Results: Average Day Demands— Headloss Gradients...29 Figure 5-4: Phase I & II Steady State Analysis Results: Average Day Demands— Pressures..................30 Figure 5-5: Phase I & II Steady State Analysis Results: Maximum Day Demands— Pipe Velocities ........32 Figure 5-6: Phase I & II Steady State Analysis Results: Maximum Day Demands— Headloss Gradients 33 Figure 5-7: Phase I & II Steady State Analysis Results: Maximum Day Demands— Pressures................34 Figure 5-8: Phase I & II Steady State Analysis Results: Maximum Day Demands Plus Fire Flows ..........35 Figure 5-9: Phase I & II Steady State Analysis Results: Peak Hour Demands— Pipe Velocities ..............37 Figure 5-10: Phase I & II Steady State Analysis Results: Peak Hour Demands — Headloss Gradients ....38 Figure 5-11: Phase I & II Steady State Analysis Results: Peak Hour Demands— Pressures....................39 List of Tables Table 2-1: River Islands Land Uses—Applicable Parcel Area.....................................................................8 Table 2-2: River Islands— Phase I and II Land Uses ...................................................................................9 Table 2-3: River Islands— Phase I and II Average Day Demands ...............................................................9 Table 2-4: River Islands— Phase I and II Maximum Day Demands (Peaking Factor= 1.7)......................10 Table 2-5: River Islands— Phase I and 11 Peak Hour Demands (Peaking Factor= 3.4)............................10 Table 2-6: Fire Flow Requirements.............................................................................................................10 Table 2-7: Phase I City of Lathrop Potable Water Storage and Booster Pump Station at River Islands— FirmPumping Capacity...............................................................................................................................11 Table 2-8: Proposed Phase II City of Lathrop Potable Water Storage and Booster Pump Station at River Islands - Firm Pumping Capacity................................................................................................................12 Table 3-1: City of Lathrop and River Islands Fire Storage Requirements..................................................13 Table 3-2: River Islands Phase I and 11 —Total Potable Water Storage Requirement ...............................14 Table 4-1: City of Lathrop—Allocated SCWSP Potable Water from SSJID...............................................19 Table 4-2: City of Lathrop— Design SSJID Turnout Capacities..................................................................19 Table 4-3: SSJID PW Storage and Transfer Pump Station at River Islands (Site A)— Firm Pumping Capacity......................................................................................................................................................21 Table 5-1: Steady State Analysis Results—Average Day Demands .........................................................26 Table 5-2: Steady State Analysis Results— Maximum Day Demands.......................................................31 Table 5-3: Steady State Analysis Results— Maximum Day Demands Plus Fire Flows .............................31 Table 5-4: Steady State Analysis Results— Peak Hour Demands.............................................................36 Table 6-1: Preliminary River Islands Construction Schedule &Associated Demands...............................40 Table 6-2: Minimum Preliminary Improvement Implementation Schedule .................................................41 Appendices: Appendix A— Land Use Exhibits Appendix B— Irrigation Coverage Exhibits Appendix C—City of Lathrop Updated Demand Projection (August 2020) Appendix D— Fire Flow Requirements—2019 City of Lathrop Design and Construction Standards 4