RWCF Modifications Project
East Bank Outfall Relocation
Supplemental Environmental Impact Report
Stockton City Council
October 18, 2022
Agenda Item No. 15.3
RWCF Modifications Project
Supplemental EIR (SEIR)
• Original EIR
• Use existing pipelines to convey to outfall on west bank • CEQA and permitting to proceed to meet schedule
• EIR certified at Council Meeting on July 29, 2019
• Install temporary pipelines to serve until new outfall permitted and constructed in future
• Temporary solution for approximately five years
• Purpose of East Bank Outfall Relocation Project
• Consolidate operations at Main Plant (east side of River) • Avoid cost of temporary pipelines and structures of $1M • Allow gravity discharge more than 90% of time
• Comply with NPDES Discharge Permit
Work No Longer Needed (Temporary)
East Bank Outfall Relocation Construction
East Bank Outfall Relocation SEIR
• Evaluation
• Located formerly-used outfall pipe through levee (circa 1970s) • Considered its use for east bank outfall
• Determined acceptable for Project
• Updated Design
• Pipe suitable for reuse with lining
• Modify Final Effluent Pump Station (FEPS)
• Reroute effluent pipeline to existing outfall pipe
• Extend existing outfall pipe out and down into river
East Bank Outfall Relocation SEIR
• Resources Analysed In the SEIR
• Hydrology
• Water Quality
• Terrestrial Biology
• Aquatic Biology
• Permitting
• Central Valley Flood Protection Board (Flood Board)-complete • Reclamation District 404-In progress
• Corp of Engineers (COE)-In progress
• Endangered Species Act (ESA): National Marine Fisheries Service (NMFS), Biological Assessment & Biological Opinion • California State Lands Commission Lease
SEIR Review/Comment Process
• Notice of Availability: February 25, 2022
• Comment Period: February 25 to April 11, 2022
• Final EIR
• Findings of Fact
• Mitigation Monitoring and Reporting Program (MMRP)
• Council Consideration of Final EIR
SEIR Findings
• No significant and unavoidable impacts
• Less-than-significant impacts
• Hydrology
• Water Quality
• Less-than-significant impacts with mitigation
• Terrestrial biology
• Aquatic biology
Recommendations
• Summary of Requested Actions:
1. Adopt a resolution to certify that the Final Supplemental Environmental Impact Report (SEIR) prepared for the
Regional Wastewater Control Facility (RWCF) Modifications Project has been completed in compliance with the
California Environmental Quality Act and finds the Final EIR adequately addresses the environmental issues of the
RWCF Modifications Project.
2. Adopt the Findings of Fact.
3. Adopt the Mitigation Monitoring and Reporting Program.
4. Authorize City Manager to execute a lease agreement with the California State Lands Commission.