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OPERATION AND MAINTENANCE PROGRAM © 2025 Fischer Compliance, LLC. All rights reserved. Sewer System Management Plan licensed for Redwood City use only Page 33 of 59 Specifications 5.19 - Operations and Maintenance WDR REQUIREMENTS Specification. 5.19 (pg. 27) “To prevent discharges to the environment, the Enrollee shall maintain in good working order, and operate as designed, any facility or treatment and control system designed to contain sewage and convey it to a treatment plant.” COMPLIANCE The City maintains a robust maintenance program, as described below. Gravity Sewer Maintenance All sewer mains are assigned a preventive maintenance schedule, which consists of performing sewer cleaning at a minimum of once every four years. In addition, the City assigns more frequent preventive maintenance to sewer mains susceptible to root intrusion, grease accumulation, and debris deposition with the goal of preventing sewer line blockages and spills. More frequent preventive maintenance of a sewer main is determined by a combination of a history of blockages, sewer cleaning crew feedback, maintenance defects identified through CCTV inspection, and location with respect to other risk factors. The City maintains a list of the sewer mains identified as requiring more frequent preventative maintenance. This list is continually being updated as additional information is collected and analyzed and is available upon request. One of the primary sources of information utilized by the City to determine the appropriate preventive maintenance schedules for sewer mains is feedback from sewer cleaning crews who include this information in Hiperweb inspections and work orders. The work orders include the following information: date, location, method of cleaning, findings, and whether further actions are necessary. These reports provide the Utilities Field Supervisor with additional information to determine whether to increase or decrease preventive maintenance on a particular sewer main. Work orders are also utilized to identify locations where further inspection and repairs are warranted. Based on the information from these cleaning reports, the Utilities Field Supervisor may create work orders for sewer line repair or manhole construction projects. Staff reviews the high frequency cleaning program and spill locations annually for further evaluation. Line segments with noted fats, oils, and grease are flagged for further follow-up either by SVCW’s source control inspectors for food service locations, or Public Works Services for residential areas. Operations feedback is shared with the Engineering and Transportation Department for consideration in future capital improvement projects. Gravity Main Condition Assessment The City has implemented a multi-year program to perform both CCTV inspection of all sewer pipeline segments and visual inspection of all sewer manholes. The City utilizes a CCTV contractor for its CCTV inspections. CCTV inspections are documented utilizing the National Association of Sewer Service Companies (NASSCO) Pipeline Assessment Certification Program (PACP) inspection ratings. Inspection data is collected and stored in WinCan VX, a commercially available CCTV inspection software. The City maintains a master CCTV database repository of all sewer pipeline inspections on the City’s shared network drive. Inspection of the sewer system is performed by sewerage catchment basins and prioritized based on inflow/infiltration factors documented in the November 2023 Sanitary Sewer Master Plan update. WinCan does not currently interface with Hiperweb. If City staff need to review videos, they must review them through WinCan software at the City office. ATTY/RESO.0077/CC RESO SEWER SYSTEM MANAGEMENT PLAN - EXHIBIT A REV: 07-14-25 LF Page 40 of 317