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Page 11 of 20 City of Redwood City 1017 Middlefield Road, Redwood City, CA. 94063 Tel: 650-780-7000 www.redwoodcity.org improvement projects recommended by previous updates to the SSCMP. However, future redevelopment will increase wastewater flows and may create new capacity constraints. The Comprehensive Sanitary Sewer Master Plan will support the City’s compliance requirement to prepare a system evaluation, capacity assurance and capital improvements element as part of its Sewer System Management Plan (SSMP). The SSMP addresses the overall management, operation, and maintenance of the sanitary sewer system and is required for all sanitary sewer system agencies under the SWRCB’s Statewide Waste Discharge Requirements General Order for Sanitary Sewer Systems adopted in 2022. b. Sanitary Sewer Collection System Improvements The City is upgrading the sanitary sewer collection system through the ongoing Collection System Replacement Program, which aims to replace approximately 10,000 linear feet of sewer pipes each year and rehabilitate one or two of its 31 sewer pump stations annually. Since much of the system’s infrastructure was constructed prior to 1960, some parts are reaching the end of their expected service life and requiring emergency repairs. Replacement and rehabilitation of the sanitary sewer infrastructure is more cost-effective and less disruptive than continued emergency repairs. Annual closed-circuit television (CCTV) inspections assess the condition and identify significant defects of the sewer pipelines, helping staff prioritize repairs, replacement and rehabilitation before an emergency occurs. However, the CCTV inspection program is limited by time and budget constraints. In addition to CCTV inspections, flow monitoring is used to identify areas of the system that may be vulnerable to inflow and infiltration of groundwater and stormwater. This seepage into the sanitary sewer collection system reduces the system’s capacity to handle wastewater flows. Monitoring flow capacity also helps identify areas of the collection system that may need upgrades to accommodate future development. In addition to annual sanitary sewer improvements, the City is proactively designing essential sanitary sewer improvements in the downtown area to support both current and future development. As part of this effort, we are designing approximately 950 linear feet of sanitary sewer main to replace the existing undersized 48-inch main with a larger 60-inch main. This upgrade is a critical component of the City’s backbone infrastructure, ensuring sufficient capacity not only for the downtown area but for the entire City. These improvements are vital to meeting the growing demand for sanitary sewer services and will support the City’s broader climate action, economic development and housing goals. The City is also actively pursuing funding and grants to support these much-needed upgrades. c. Sanitary Sewer System Budget Perhaps the most significant challenge for the sanitary sewer system is the ongoing reconstruction of the SVCW treatment plant. The City is contractually obligated to pay for roughly half of the expected $900M cost of this reconstruction, and this responsibility was a primary factor for sewer rate increases in the recent past. Table 3 represents the City’s funding for the sanitary sewer system over the past 10 years. The system’s capital budget has remained around 16 percent of the total allocation. 9.A. - Page 11 of 20 496