Site Visit SB Exp-ENG 11.7.2025_rev.pptx
PPTX presentation 1 MB Posted
- Attached to
- Operation & Maintenance of the South Bay Wastewater Treatment Plant Federal contract opportunity
- Solicitation number
- FY26OMSBIWTP
About this file
This PowerPoint presentation provides a detailed overview of the South Bay International Wastewater Treatment Plant (SBIWTP) Rehabilitation and Expansion project. The presentation outlines major infrastructure upgrades including new electrical buildings, additional sedimentation tanks, sludge thickening and storage systems, integrated headworks, and enhanced chemical treatment capabilities. Key improvements include replacing influent pumps with submersible types, installing new coarse and fine screens, implementing advanced grit removal technology, and increasing plant capacity by 35 MGD.
The project timeline indicates major construction will be completed by 8/28/25, with ongoing fine-tuning of operations and SCADA integration. Significant benefits include decreased dry-weather sewage flows in the Tijuana River, improved hydrogen sulfide levels, and overall environmental improvements. The expansion includes mobile sludge dewatering units, new chemical systems, repairs to influent pump stations, and the ability to bypass 10 MGD of primary treated flows while maintaining 25 MGD through secondary treatment. The current estimated construction completion date is 7/30/2031, with design completion projected for 7/30/2026.
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Text version
INTERNATIONAL BOUNDARY AND WATER COMMISSION
UNITED STATES SECTION
SBIWTP Expansion
November 7, 2025
SBIWTP Rehabilitation and Expansion Current Design Completion: 7/30/2026* *Pending time impact/extension for design of incremental increase Current Estimated Construction Completion: 7/30/2031 Construction is still phased with primary treatment and headworks completing sooner than secondary treatment expansion Construction issued in various packages to start construction early:
Grit Rehab in progress Concrete Repairs Replace in kind Site Work Long Lead Procurement AST Rehabilitation Major Concrete Structures Planning for potential acceleration to the expansion in progress but not yet finalized or executed
MIKE
SBIWTP Rehabilitation and Expansion Overview New 12 kV Electrical Building 2 Additional Primary Sedimentation Tanks
10 New SSTs
New Sludge Thickening and Storage Expanded Operations Personnel Building and Rehab New Sludge Dewatering and Odor Control System Rehabbed Grit Facility (Temporary) New Chemical Enhanced Primary Treatment 7 New ASTs New Integrated Headworks 2 New PSTs New 12kV Electrical Building and Generators New Warehouse Storage New Chemical Storage
MIKE
Replaces influent pumps with submersible type that are more effective for our type of influent Better Coarse Screens New Fine Screens (does not currently exist) Grit Removal through advanced technology Redundancy for operations and maintenance
Fine Screens Grit Removal New Headworks Influent Pump Station & Coarse Screens
ROBUST HEADWORKS PLANNED
35 MGD Capacity Increase SBIWTP Rehab and Expansion Major construction completed 8/28/25; fine tuning operations and SCADA integration ongoing Reestablished Chemically Enhanced Primary Treatment (CEPT) to provide Advanced Primary Treatment for 35 MGD (increase of 10MGD) Installed additional solids handling equipment (rented and purchased) Solids thickening (rented-gravity belt thickeners, to be purchased-rotary drum thickeners) Solids dewatering (screw presses) Completed necessary upgrades to receive temporary equipment for increased flows Bypass 10 MGD of primary treated flows around the secondary process and blend at the effluent outfall structure Flows and processes will be monitored using existing SCADA system Performed SBOO modifications Worked with RWQCB to issue CDO to allow 35MGD blended effluent (25MGD Secondary & 10MGD Primary) Benefits:
Decrease dry-weather sewage flows in the Tijuana River Improvement in H2S levels Overall environmental improvement
Replacement of American Canal
ESD-AG
35 MGD Operation Schematic SBIWTP Rehab and Expansion
Mobile sludge dewater unit and integration with existing dewatering system (2 screw presses) New chem systems and rehab of mech systems Repairs to influent PS and grit equipment Mobile sludge thickening units (2 GBTs) 10MGD Primary Bypassed to Effluent 25MGD Continues through Secondary Treatment
Replacement of American Canal
ESD-AG
Q&A
International Boundary and Water Commission United States Section image4.png image5.jpeg image6.png image7.png image3.png image8.png image9.png image2.png image1.png
File details come from the government source that posted it. Updated .