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Introduction City of Redwood City (0011239.02)1-8 Woodard & Curran, Inc. Sanitary Sewer Capacity Master Plan November 2023 developed in Tasks 4 and 5. The model was calibrated for dry and wet weather conditions using the flow monitoring data collected under Task 3. A TM was prepared to summarize the basis for model construction and calibration. •Task 7 – Evaluate System Hydraulic Performance. The model was used to determine collection system capacity requirements and identify capacity deficiencies under peak wet weather flow conditions, defined based on a design storm and system performance criteria developed in Task 5. Areas of the system with high rates of infiltration/inflow (I/I) were identified, and the potential for eliminating needed capacity improvements by reducing I/I was assessed. •Task 8 – Develop Capacity Relief Projects. Potential solutions to capacity deficiencies were identified and tested in the model, and capacity improvement projects were developed based on these analyses. •Task 9 – Develop Sewer System Capital Improvement Program (CIP). Cost estimates were prepared for each of the capacity improvement projects. Projects were assigned priority rankings based on design storm deficiency and flow confirmation levels, and a phased CIP was prepared. •Task 10 – Prepare Master Plan Report. This report was prepared to present the results and recommendations of the study. An amendment to the Master Plan agreement was executed in November 2022 and included several additional tasks, including update of development projections; update of the model network to incorporate recently constructed projects; additional review of the City’s sewer engineering standards; and an analysis of diversity, equity, and inclusion considerations for the recommended capacity improvement program. 1.5 REPORT ORGANIZATION The contents of each of the chapters and appendices of this Master Plan report are described below. Executive Summary The Executive Summary provides a brief, stand-alone summary of the Master Plan report, with emphasis on the major findings and recommendations. Chapter 1- Introduction This introductory chapter provides background information on the objectives and scope of the Master Plan, the City’s sewer system and service area, and the contents and organization of this report. Chapter 2 – Hydraulic Model Development and Calibration This chapter describes the modeled sewer system, the flow monitoring program and basis for estimating model flows, and the calibration of the model for dry and wet weather conditions. Chapter 3 – Capacity and I/I Assessment This chapter defines the basis for the capacity assessment of the system, including the selected design storm and performance criteria and describes the identified capacity deficiencies based on the model results. The chapter also identifies areas of the system with high I/I and provides recommendations for future flow monitoring to focus those efforts. Chapter 4 – Recommended Capacity Improvement Program This chapter presents the recommended capacity improvement projects. Each project is documented with a general description, planning level capital cost estimate, and relative priority rating. ATTY/RESO.0077/CC RESO SEWER SYSTEM MANAGEMENT PLAN - EXHIBIT A REV: 07-14-25 LF Page 114 of 317