City Council Agenda
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Memo to: |
Manteca City Council |
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From: |
Jose Jasso, Assistant City Manager / Interim Director of Public Works |
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Prepared by: |
Dustin Valiquette, Wastewater Operations Manager |
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Date: |
November 4, 2025 |
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Subject: |
Approve the - City of Manteca’s Sewer System Management Plan |
Recommendation:
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Adopt a resolution approving the update of the Sewer System Management Plan, as mandated by the State Water Resources Control Board.
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Background:
The City’s sanitary sewer system is regulated by the State Water Resources Control Board (SWRCB). On May 2, 2006, the SWRCB adopted Order No. 2006-0003-DWQ, Statewide General Waste Discharge Requirements (WDR) for Sanitary Sewer Systems. On December 6, 2022, the SWRCB adopted a revised WDR Order No. WQ 2022-0103-DWQ1. The revised WDR became effective on June 5, 2023.
The WDR governs the operations and maintenance of wastewater collection systems and requires agencies to develop, implement, and periodically update a system-specific Sewer System Management Plan (SSMP). The SSMP is a guiding document for the proper management, operation, and maintenance of all parts of the sanitary sewer system. The goal of the WDR and the SSMP is to reduce and prevent Sanitary Sewer Spills (SSS), and to mitigate the effects of any SSS that do occur. Adherence to the SSMP aids staff in achieving the City’s goal of reducing SSS and ensures continued compliance with all State and Federal regulations. The SSMP must be approved by the “Enrollees” governing board (Manteca City Council) at a public meeting. Failure to approve and/or update the SSMP would be in violation of Order No. WQ 2022-0103-DWQ statewide general waste discharge requirements. The failure to approve and or update could result in penalties up to $10,000 dollars per day.
The revised WDR requires staff to perform audits on the SSMP a minimum of every three (3) years and complete updates to the SSMP every six (6) years, or when significant changes are made to operations. Other significant changes to the previous order include:
• Expanding sewer spill definitions to include a prohibition on “Waters of the State”, including groundwater,
• Adding a new spill category; Category 4 - Spills under 50 gals,
• Requirements to assess risks associated with climate change,
• Requirements to provide list Capital Improvement Project (CIP) funding sources and expected completion dates,
• Requires adequate funding to ensure compliance with WDR,
• Requires pro-active management of the sewer system, and
• Requires preplanning and coordination with other agencies.
The most recent audit report and findings are included in Section 10 of the City of Manteca SSMP update (Attachment 2). The findings include, but are not limited to the following:
Major SSMP audit findings:
• Amended org chart with names and phone numbers of staff responsible for SSMP
• Revised reporting schedule (new increased monitoring requirement)
• Plan to identify system assets vulnerable to the impacts of climate change is needed (new requirement)
• Funding sources and estimated completion dates need to be added to CIP project list (new requirement)
• Updates to the SSO Trends in SSMP Chapter 9, Monitoring, measurement, and plan modifications (2019 and 2021 Audits)
Fiscal Impact:
There is no fiscal impact associated with this resolution.
Documents Attached:
1. Attachment 1 - Resolution
2. Attachment 2 - Sewer System Management Plan