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 basin or facility, if applicable; and 11. Estimated total spill volume recovered. 3.2.2. Certified Spill Report for Category 2 Spills Within 15 calendar days of the spill end date, the Enrollee shall submit a Certified Spill Report for the Category 2 spill, to the online CIWQS Sanitary Sewer System Database (https://ciwgs.waterboards.ca.gov). Upon completion of the Certified Spill Report, the online CIWQS Sanitary Sewer System Database will issue a final spill event identification number. The Certified Spill Report must, at minimum, include the following mandatory information in addition to all information in the Draft Spill Report per section 3.2.1 (Draft Spill Report for Category 2 Spills) above: 1. Description of the spill event destination(s), including GPS coordinates if available, that represent the full spread and reach of the spill; 2. Spill end date and time; 3. Description of how the spill volume estimations were calculated, including at a minimum: o The methodology, assumptions and type of data relied upon, such as 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(ies), assumptions and type of data relied upon for estimations of the spill start time and the spill end time; 4. Spill cause(s) (for example, root intrusion, grease deposition, etc.); 5. System failure location (for example, main, pump station, etc.); 6. Description of the pipe/infrastructure material, and estimated age of the pipe material, at the failure location; 7. Description of the impact of the spill; 8. Whether or not the spill was associated with a storm event; 9. Description of spill response activities including description of immediate spill containment and cleanup efforts; 10. Description of spill corrective action, including steps planned or taken to reduce, eliminate, and prevent reoccurrence of the spill, and a schedule of major milestones for those steps; 11. Spill response completion date; 12. Detailed narrative of investigation and investigation findings of cause of spill; 13. Reasons for an ongoing investigation (as applicable) and the expected date of completion; and ATTACHMENT E1 — NOTIFICATION, MONITORING, REPORTING AND RECORDKEEPING REQUIREMENTS December 6, 2022 E1 - 13