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SYSTEM EVALUATION, CAPACITY ASSURANCE, CAPITAL IMPROVEMENTS © 2025 Fischer Compliance, LLC. All rights reserved. Sewer System Management Plan licensed for Redwood City use only Page 48 of 59 8.3. Prioritization of Corrective Action WDR REQUIREMENTS Attachment D-8.3 (pg. D-9) “The findings of the condition assessments and capacity assessments must be used to prioritize corrective actions. Prioritization must consider the severity of the consequences of potential spills.” COMPLIANCE The 2023 Sanitary Sewer Capacity Master Plan revision included a hydraulic analysis with updated flow monitoring information and land use data. The results were similar to the 2013 Master Plan, which at that time required a significant increase in the recommended capital improvement program to address existing and future growth and pipeline capacities. The 2013 Master Plan identified approximately $45 million of recommended capital improvements to the City’s wastewater collection system, while the 2023 Master Plan identified approximately $42 million in capital improvements. Based on priority rankings, approximately $14,242,000 of capital projects were ranked in the highest priority categories (1 and 2). This means that the flow model identified the risk of potential spills under existing conditions. Despite this information, the City has not experienced any spills as projected by the model in those locations. The City has been proactively conducting CCTV inspections of the wastewater collection system to assess the conditions to identify sources of infiltration and inflow into the City’s sewer system. Reductions in infiltration and inflow could reduce the potential spill conditions and may also reduce the need for the capital improvements identified in the updated master plan. Currently, the City is working on developing a prioritization matrix for the City’s sewer management and capital improvement program which would incorporate priorities such as reliability, responsiveness, and environmental protection. Reliability is to address system capacity and condition concerns. Responsiveness is to document the City’s plan of action to address system problems such as spills. The City’s response actions include repairs or spill containment and clean-up. Environmental protection is to document the City’s plan for prevention of spills. The matrix will help develop a plan based on the ranking of the priorities. The recommended capacity improvement projects listed in the 2023 Sanitary Sewer Capacity Master Plan are found in the table below. Project ID 1 Location Length (lf.) Existing Dia. (in.) Proposed Dia. (in.) C2 2 Bradford St. (Jefferson Ave. to Main St.) 540 24 36 C32 Beech St., Stambaugh St., Walnut St. (Caltrain ROW to Bradford St.) 3,310 27 36 C42 California St., Broadway St., Marshall St., Jefferson Ave. (south of Winklebleck St. to Bradford St.) 2,430 12/15/18 18/21/24 C5 Jefferson Ave. (n/o Redwood Creek siphon and Broadway St. to Marshall St.) 590 10/12 12/18 1 Project C1 was originally identified to replace one of the existing 27-inch trunk lines in Walnut Avenue between Bradford Street and Veterans Boulevard. However, the City has already authorized the South Main Sanitary Sewer Mitigation project, which will replace one of those lines with a new 42-inch sewer. 2 Project also identified in previous master plans. ATTY/RESO.0077/CC RESO SEWER SYSTEM MANAGEMENT PLAN - EXHIBIT A REV: 07-14-25 LF Page 55 of 317