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City of Redwood City (0011239.02)1-1 Woodard & Curran, Inc. Sanitary Sewer Capacity Master Plan November 2023 1.INTRODUCTION This report presents the results and recommendations of the Sanitary Sewer Capacity Master Plan (Master Plan) for the City of Redwood City (City). The report was prepared by Woodard & Curran under an agreement with the City dated February 14, 2019. 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 the Master Plan report. 1.1 BACKGROUND AND STUDY OBJECTIVES The City’s previous Sewer Master Plan was completed in 2008, and a limited update was prepared in 2013. Since then, the City has experienced significant development, particularly in its downtown area, and has also implemented a proactive program of flow monitoring, sewer inspection, and sewer rehabilitation and replacement to address extraneous storm water and groundwater entering the sanitary sewer system, termed infiltration/inflow (I/I), and structural deficiencies in the system. The City has completed a number of the capacity improvement projects recommended in the previous master plans, but areas of capacity deficiencies still remain. Additional redevelopment is projected in the future, which will further increase wastewater flows and may create additional capacity constraints. The objective of this study is to update the City’s 2008 Sewer System Master Plan and 2013 Sewer Master Plan Update, and to provide input for the City’s Capital Improvement Program and guidance for the City’s future sewer assessment and improvement efforts. This Master Plan also supports the City in meeting the requirements to prepare a System Evaluation and Capacity Assurance Plan (SECAP) as part of its Sewer System Management Plan (SSMP). The SSMP addresses the overall management, operation, and maintenance of the sewer system and is required for all sewer system agencies under the Statewide General Waste Discharge Requirements for Sanitary Sewer Systems adopted in 2006 by the State Water Resources Control Board. The overall objectives of this Master Plan are to develop up-to-date wastewater flow projections for the City’s collection area using current water use and flow monitoring data and future development information; develop an updated hydraulic model including all of the sewers in the collection system; use the model to identify existing capacity deficiencies and future capacity requirements; identify areas that may be a priority for flow monitoring and rehabilitation efforts to reduce I/I; and develop a prioritized plan, including budget estimates, for implementing the needed capacity improvements to the sanitary sewer system. 1.2 STUDY AREA The City is located in San Mateo County and is bounded by the San Francisco Bay on the east, the Cities of Foster City, Belmont, and San Carlos on the north and west, and the City of Menlo Park and Towns of Woodside and Atherton to the south. The census-designated places of North Fair Oaks and Emerald Lakes Hills, unincorporated areas of San Mateo County, are also located adjacent to the City on its east and west sides, respectively. The City has three fairly distinct collection system areas. The main part of the City (“Main City”), located southwest of Highway 101, includes the City’s downtown as well as residential areas. Seaport/Pacific Shores and Redwood Shores, the other two areas, are both located on the east side of Highway 101, near the San Francisco Bay. Figure 1-1 shows the Redwood City area. ATTY/RESO.0077/CC RESO SEWER SYSTEM MANAGEMENT PLAN - EXHIBIT A REV: 07-14-25 LF Page 107 of 317