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City of Redwood City (0011239.02)ii Woodard & Curran, Inc. Sanitary Sewer Capacity Master Plan November 2023 3.2.1 Gravity Sewer System Capacity Deficiencies ........................................................................3-3 3.2.2 Gravity Sewer Capacity Relief Projects .................................................................................3-6 3.2.3 Pump Station Capacity ..........................................................................................................3-6 3.3 Summary of System Flows .............................................................................................................3-12 3.4 Infiltration/Inflow Analysis ...............................................................................................................3-13 3.4.1 Potential I/I Reduction ..........................................................................................................3-18 4.RECOMMENDED CAPACITY IMPROVEMENT PLAN .....................................................................................4-1 4.1 Capacity Improvement Program .......................................................................................................4-1 4.1.1 Cost Criteria ...........................................................................................................................4-1 4.1.2 Project Rankings and Flow Confirmation Levels ...................................................................4-1 4.1.3 Recommended Capacity Improvement Program ...................................................................4-2 4.1.4 Project Implementation Recommendations ...........................................................................4-6 4.2 Recommendations for Future Flow Monitoring .................................................................................4-6 APPENDICES (submitted separately) Appendix A:Model Development Technical Memorandum Appendix B:Design Flow and Hydraulic Criteria Technical Memorandum Appendix C:Future Development Projects Appendix D:Capacity Improvement Project Details Appendix E:Diversity, Equity, and Inclusion Analysis TABLES Table ES-1:Summary of Wastewater Collection System Flows .............................................................................5 Table ES-2: Recommended Capacity Improvement Projects ................................................................................9 Table ES-3:Capacity Improvement Project Costs and Rankings .........................................................................11 Table 1-1:Collection System Inventory .............................................................................................................1-4 Table 2-1:Major Rainfall Events During 2018/19 Monitoring Period .................................................................2-7 Table 2-2:Sewage Generation Unit Flow Factors Based on City Standards ..................................................2-12 Table 2-3:Base Wastewater Flow Summary ..................................................................................................2-14 Table 3-1:Gravity Sewer Capacity Relief Projects ............................................................................................3-7 Table 3-2:Pump Station Capacity Results ......................................................................................................3-11 Table 3-3:Summary of Wastewater Collection System Flows ........................................................................3-12 Table 3-4:RDI/I Rates and Peaking Factors by Flow Meter Area ...................................................................3-13 Table 3-5:Potential Elimination of Capacity Relief Projects through RDI/I Reduction ....................................3-18 Table 4-1:Capacity Improvement Project Costs and Rankings ........................................................................4-3 ATTY/RESO.0077/CC RESO SEWER SYSTEM MANAGEMENT PLAN - EXHIBIT A REV: 07-14-25 LF Page 84 of 317