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River Islands Development at Lathrop November 2020 Final Phase 2 Sewer Technical Report Rev 1 #6520 Table of Contents 1. Introduction .........................................................................................................................................6 1.1 Background ...................................................................................................................................6 1.2 Report Objectives..........................................................................................................................6 2. River Islands Sewer Collection System............................................................................................8 2.1 Existing River Islands Sewer Collection System...........................................................................8 2.1.1 Interim Sewer Pump Station .....................................................................................................8 2.1.1.1 Capacity Evaluation ..........................................................................................................8 2.1.2 Existing River Islands Recycled Water Flushing System..........................................................8 2.2 Phase I and II River Islands Sewer Collection System.................................................................8 2.2.1 Land Uses.................................................................................................................................9 2.2.2 Phase II Recycled Water Flushing System.............................................................................11 2.2.3 Interim and Emergency Bypass System — Phase 11................................................................11 3. Sewer Generation Rates...................................................................................................................12 3.1 Sewer Generation Rates.............................................................................................................12 3.1.1 Sewer Generation Rates—Average Dry Weather Flow .........................................................12 3.1.2 Sewer Generation Rates— Peak Wet Weather Flow..............................................................13 4. Sewer Collection System Design and Performance Requirements.............................................14 4.1 Pipe Capacity..............................................................................................................................14 4.1.1 Pipe Capacity- Depth/Diameter Ratio....................................................................................14 4.1.2 Pipe Capacity— Minimum and Maximum Velocities and Slope..............................................14 4.2 Sewer Lift Stations— Firm Pumping Capacity.............................................................................16 5. River Islands Sewer Collection System Model ..............................................................................17 5.1 GIS Sewer Collection System Model..........................................................................................17 5.2 GIS Sewer Collection System Model Basis and Assumptions ...................................................17 5.2.1 Areas Without Finalized Improvement Plans Assumptions ....................................................17 6. River Islands Sewer Collection System Model — Preliminary Phase 2 Results..........................19 6.1 Overview .....................................................................................................................................19 6.2 Sewer Collection Area C1 ...........................................................................................................19 6.2.1 Sewer Collection Area C1 — Land Uses, Average Dry Weather Flows, and Peak Wet Weather Flows 19 6.2.2 Sewer Lift Station C1 (LS-C1)— Preliminary Firm Pumping Capacity Requirements ............22 6.3 Sewer Collection Area C2 — Preliminary Steady State Results..................................................22 6.3.1 Sewer Collection Area C2— Land Uses, Average Dry Weather Flows, and Peak Wet Weather Flows 22 6.3.2 Sewer Lift Station C2 (LS-C2)— Preliminary Firm Pumping Capacity Requirements ............23 6.4 Sewer Collection Area B1 — Preliminary Steady State Results ..................................................23 6.4.1 Sewer Collection Area B1 — Land Uses, Average Dry Weather Flows, and Peak Wet Weather Flows 23 6.4.2 Sewer Lift Station B1 (LS-B1)— Preliminary Firm Pumping Capacity Requirements.............24 2