City of Norman

PROJECT PURPOSE

Clarifiers 1 and 2 at the Norman Water Treatment Plant were installed in 1965 when the treatment plant was first built. Each clarifier holds 1 million gallons of Lake Thunderbird water being treated with lime and ferric sulfate. Due to the age of these clarifiers staff is concerned about the structural integrity and how much longer they will last without significant damage. NUA hired SUEZ Technologies to do a small visual inspection at the beginning of this fiscal year and they found significant corrosion on parts of the structure. The NUA is currently under contract with Carollo Engineering to provide a more detailed inspection and provide rehabilitation suggestions. This contract is ongoing, but it is expected that rehabilitation, once determined, will cost approximately $500,000.

EVIDENCE

As mentioned in number 4, NUA hired SUEZ Water Technology Solutions to provide a small visual inspection of one of these clarifiers. This company owns the ?Accelerator? technology employed by these two clarifiers. They found significant pitting and corrosion of steel and indicated the need to repair/replace the launder and outer wall brackets, in addition to realignment for the hood structure and circular deckplate, as well as re-painting the structure. A copy of their report is attached to this document.

POPULATION DESCRIPTION

All citizens in Norman utilizing treated drinking water will be impacted by this project. This project will get a head start to any future emergency shutdown that might be needed due to series damage caused by potential failure if rehabilitation doesn?t take place now.

PERFORMANCE MEASURING

The NUA has had two other clarifiers installed since the plant was first built and maintenance has occurred for each of these clarifiers. However, maintenance due to age have not been investigated before. Once the project is complete, the clarifiers will be put back into service allowing for peak demand. Operators are skilled at dosage flow adjustments and monitor each clarifier every 2 hours.

ONGOING INVESTMENT AMOUNT

$

ONGOING INVESTMENT DESCRIPTION

None

ONGOING INVESTMENT REQUIRED

Able to continue operation without additional funding from the State of Oklahoma