Item 07 - Sewer System Management Plan 2025 Update

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STATEWIDE SANITARY SEWER SYSTEMS GENERAL ORDER 2022-0103-DWQ o Estimated spill volume discharged to a groundwater infiltration basis or facility, if applicable. 10. Estimated total spill volume recovered; 11. Description of the spill event destination(s), including GPS coordinates, if available, that represent the full spread and reaches of the spill; 12. Spill end date and time; 13. Description of how the spill volume estimations were calculated, including, at minimum: o The methodology and type of data relied upon, including supervisory control and data acquisition (SCADA) records, flow monitoring or other telemetry information used to estimate the volume of the spill discharged, and the volume of the spill recovered (if any volume of the spill was recovered), and o The methodology and type of data relied upon to estimate the spill start time, on -going spill rate at time of arrival (if applicable), and the spill end time; 14. Spill cause(s) (for example, root intrusion, grease deposition, etc.); 15. System failure location (for example, main, pump station, etc.); 16. Description of the pipe/infrastructure material, and estimated age of the pipe/infrastructure material, at the failure location; 17. Description of the impact of the spill; 18. Whether or not the spill was associated with a storm event; 19. Description of spill response activities including description of immediate spill containment and cleanup efforts; 20. Description of spill corrective actions, including steps planned or taken to reduce, eliminate, and prevent reoccurrence of the spill, and a schedule of the major milestones for those steps; including, at minimum: o Local regulatory enforcement action taken against an illicit discharge in response to this spill, as applicable, and o Identifiable system modifications, and operation and maintenance program modifications needed to prevent repeated spill occurrences at the same spill event location, including: ■ Adjusted schedule/method of preventive maintenance, ■ Planned rehabilitation or replacement of sanitary sewer asset, ■ Inspected, repaired asset(s), or replaced defective asset(s), ■ Capital improvements, ■ Documentation verifying immediately implemented system modifications and operating/maintenance modifications, ■ Description of spill response activities, ATTACHMENT E1 — NOTIFICATION, MONITORING, REPORTING AND RECORDKEEPING REQUIREMENTS December 6, 2022 E1 - 15