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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 34 of 59 The City’s sewer pipeline CCTV contractor inspects sewer manholes as part of the same inspection contract. The inspection contractor performs a visual inspection of the manhole structure and documents the manhole inspection using NASSCO Manhole Assessment Certification Program (MACP) standards. Lift Station Maintenance The City operates and maintains 31 separate lift stations. Each lift station has a separate emergency response and contingency plan that details lift station asset information, spill notification procedures, maps of surrounding pipe infrastructure, bypass procedures, lift station control systems including lockout/tagout procedures and available vendors to assist with emergency response. The Wastewater Division’s Utilities Specialist and supporting Utilities Worker are responsible for performing and overseeing preventive and emergency maintenance at the lift stations, force mains, and gate and check valve systems. Hiperweb work orders are used to document preventive maintenance activities and any additional corrective maintenance, rehabilitation, or replacement needs identified at that time. Documentation of dates of recent generator testing and scheduled key maintenance is also kept on a clipboard at each lift station. Corrective maintenance activities or special projects are scheduled by the Utilities Field Supervisor based on priority. The Utilities Specialist and Utilities Worker recommend and discuss prioritization of these projects with the Utilities Field Supervisor based on their regular maintenance findings. Lift station preventative maintenance is scheduled in monthly, quarterly, bi-annual, and annual cycles. Ideally, preventive maintenance activities can be completed within the first two weeks of the month, leaving two weeks between cycles to complete follow-up maintenance activities and special projects. Any critical issue which could result in a spill is addressed right away. The City’s lift stations are equipped with Supervisory Control and Data Acquisition (SCADA) control systems. SCADA functionality is observed daily by either the Utilities Specialist or the Utilities Worker. These staff members carry mobile devices from which they can access, monitor, and make changes to station operations via SCADA at any time. Other staff access to SCADA is limited. City engineers can view the system but cannot make changes to lift station controls. The City maintains a contract with a SCADA system consultant, who provides regular system support as well as on-call emergency support as needed. Either a Utilities Specialist or Utilities Worker is on-call 24-hours a day, 7-days a week for emergency response. The City maintains written documentation describing protocols and the application of their SCADA system. The City maintains 31 separate force mains, one from each lift station. Many of the force mains were installed at the time of the original construction of the associated lift station. In addition, the City collection system contains 24 individual sewer siphons managed and operated by City staff. Sewer siphons are maintained with a high frequency maintenance schedule. Lower Lateral Maintenance The City maintains the lower portion of each service lateral from the main line to the property line by an informal procedure. The City estimates the total linear feet of City maintained laterals at approximately 575,520 feet (or 107 miles) from 18,452 connections. Customers are responsible for installing a property line cleanout, and the City is not responsible for maintenance of the lower lateral if a property line cleanout is not present. If a property line cleanout does not exist, the City will recommend that the property owner install a property line sewer cleanout to allow the City’s sewer staff to have access to the lower lateral. City staff estimates that approximately 90 percent of all service laterals include property line cleanouts. Lower lateral maintenance responsibilities include cleaning, inspections, and repairs or replacements. ATTY/RESO.0077/CC RESO SEWER SYSTEM MANAGEMENT PLAN - EXHIBIT A REV: 07-14-25 LF Page 41 of 317