To comply with their NPDES Permit requirements, Detroit Water and Sewerage Department (DWSD) retained the services of METCO to perform a comprehensive condition survey and design solutions for major rehabilitation of the existing architectural, structural, process and control systems at Hubbell-Southfield CSO Control Facility.

METCO had designed the following major upgrades of each system in the CSO Control Facility:

Flushing System Upgrade:

• New network of piping and spray nozzle flushing system consisting of twenty-two (22) flushing spray zones.
• New flushing pumps and strainers.

Process System Improvements:

• Replace the fourteen (14) basin slide gates and operators.
• Replace the existing chemical injection mixers.
• Redesign the existing chemical storage and feed system.
• Replace the existing sample pumps on the basin.
• Redesign the existing in-system inflatable dam as flow control device.

Structural System Improvements:

• Repair all existing cracks and other structural deficiencies in the basin floor, roof and walls.
• Replace existing HVAC equipment at the basin and Head Works Building.
• Upgrade the existing fire alarm and security system.