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City of Redwood City (0011239.02)1 Woodard & Curran, Inc. Sanitary Sewer Capacity Master Plan November 2023 EXECUTIVE SUMMARY 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. 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 capacity assessment and improvement efforts. SANITARY SEWER SYSTEM AND SERVICE AREA Redwood City is located in San Mateo County, CA and has a population of approximately 87,000, served by a wastewater collection system consisting of approximately 190 miles of sewer pipelines. (Note: the City also owns and operates a municipal separate storm sewer system.) The City’s wastewater collection system also includes 31 sewer pump stations in the Redwood Shores and Seaport/Pacific Shores areas. The City is a member of the regional wastewater agency, Silicon Valley Clean Water (SVCW), which provides conveyance and treatment of flows from its member agencies1. The main portion of the City’s collection system conveys flow to SVCW’s Maple Street Pump Station, where it is pumped to the SVCW Wastewater Treatment Plant (WWTP) in Redwood Shores. Flows from the Seaport/Pacific Shores area can be discharged to the Maple Street Pump Station or directly to SVCW’s conveyance system, or partly to both locations, depending on valve settings with the system. In the Redwood Shores area, however, the City’s collection system conveys flow directly to the SVCW WWTP. The City also conveys wastewater from several San Mateo County Sewer Maintenance Districts (SMDs) that discharge flow to the City’s system, including the Fair Oaks and Emerald Lake Heights SMDs. (Note: The Fair Oaks SMD also includes some areas within the Redwood City limits.) The City’s sewer system and sanitary sewer service area are shown in Figure ES-1 and Figure ES-2. BACKGROUND AND PURPOSE OF MASTER PLAN This Master Plan provides an up-to-date assessment of the capacity of the City’s sanitary sewer system to handle both existing and future wastewater flows. 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. 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. 1 SVCW is a joint powers authority serving the Cities of Belmont, Redwood City, San Carlos, and the West Bay Sanitary District. ATTY/RESO.0077/CC RESO SEWER SYSTEM MANAGEMENT PLAN - EXHIBIT A REV: 07-14-25 LF Page 90 of 317