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River Islands Development at Lathrop November 2020 Final Phase 2 Sewer Technical Report Rev 1 #6520 List of Figures Figure 2-1: Phase I and II Wastewater Collection System —Overview......................................................10 Figure 6-1: Preliminary Phase 11 Sewer Peak Wet Weather Flows ............................................................21 Figure 7-1: Phase I Collection Area Al — Pipe Capacity— Peak Wet Weather Flows ...............................28 Figure 7-2: Phase I Collection Area Al — Pipe Velocity— Peak Wet Weather Flows.................................29 Figure 7-3: Collection Area Sewer Lift Station Al Site Plan View..............................................................30 Figure 7-4: Phase I Collection Area A2 — Pipe Capacity— Peak Wet Weather Flows ...............................33 Figure 7-5: Phase I Collection Area A2— Pipe Velocity— Peak Wet Weather Flows.................................34 Figure 7-6: Collection Area Sewer Lift Station Al Site Plan View..............................................................35 List of Tables Table 2-1: River Islands Land Uses..............................................................................................................9 Table 3-1: Land Use Sewer Flow Factors...................................................................................................12 Table 3-2: Phase I and II Average Dry Weather Flows ..............................................................................12 Table 4-1: Pipe Depth/Diameter Ratio........................................................................................................14 Table 4-2: Minimum and Maximum Pipe Velocities....................................................................................15 Table4-3: Minimum Pipe Slopes................................................................................................................15 Table 6-1: Sewer Collection Area C1 — Land Uses, ADWF, and PWWF...................................................20 Table 6-2: Sewer Lift Station Area C1 (LS-C1)— Preliminary Firm Pumping Capacity Requirements ......22 Table 6-3: Sewer Collection Area C2 — Land Uses, ADWF, and PWWF...................................................23 Table 6-4: Sewer Lift Station Area C2 (LS-C2)— Preliminary Firm Pumping Capacity Requirements ......23 Table 6-5: Sewer Collection Area B1 — Land Uses, ADWF, and PWWF...................................................24 Table 6-6: Sewer Lift Station Area B1 (LS-131)— Preliminary Firm Pumping Capacity Requirements.......24 Table 6-7: Sewer Collection Area B2 — Land Uses, ADWF, and PWWF...................................................25 Table 6-8: Sewer Lift Station Area B2 — Preliminary Firm Pumping Capacity Requirements....................25 Table 6-9: Summary of Collection Areas C1, C2, 131 & B2 Model Results.................................................25 Table 7-1: Sewer Collection Area Al — Land Uses, ADWF, and PWWF...................................................26 Table 7-2: Sewer Lift Station Al — Firm Pump Capacity at Full Buildout ...................................................30 Table 7-3: Sewer Lift Station LS-A1 Preliminary Capacity Analysis...........................................................31 Table 7-4: Sewer Collection Area A2— Land Uses, ADWF, and PWWF...................................................32 Table 7-5. Sewer Lift Station Al — Firm Pumping Capacity at Full Buildout...............................................35 Table 7-6: Sewer Lift Station PS-A2 Preliminary Capacity Analysis...........................................................36 List of Appendices Appendix A— River Islands Land Use Exhibits Appendix B— Preliminary Phase 11 Sanitary Sewer Exhibit from Odell Engineering Appendix C— King's Variable Chart Appendix D—City Standard Detail S-1: Sanitary Sewer Peaking Factors 4