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West Point Treatment Plant restoration update for Thursday, March 2, 2017


Fully staffed crews continue working to restore complete wastewater treatment capacity and function at King County’s West Point Treatment Plant, where plant operators are carefully monitoring weather forecasts for rainfall totals that could exceed the plant’s reduced treatment capabilities.


Restoration work continues at the West Point Treatment Plant, where employees and contractors have been working 24 hours a day since a Feb. 9 equipment failure reduced wastewater treatment capabilities at the plant.

Progress report for March 2:
There are approximately 60 workers at the treatment plant today, March 2, including 50 people who are dedicated to ongoing restoration work.

• Crews have removed more than 95 percent of all the pumps for inspection, cleaning, rewiring and refurbishment. Temporary motor control systems are in place.

• Instrumentation inspections and repairs continue, as do light fixture replacements. Temporary lighting has been in place throughout the plant to facilitate recovery work.

• Electrical panel replacement work continues, with contractor teams developing design and construction of the replacement panel structure.

• Repairs are also underway to the heating systems for the West Point Treatment Plant’s secondary treatment process, which includes sludge digesters that must be maintained at a certain temperature. Boiler repair work is moving forward, and a portable boiler system will be in place for use beginning next week – another critical component of getting the plant’s secondary treatment functioning again.

Upcoming weather:
The plant currently has capacity to provide limited wastewater treatment for up to 250 million gallons per day – nearly twice the capacity needed to safely treat all of the stormwater and wastewater the plant receives on an average day in early March.

No emergency bypasses of highly diluted stormwater and wastewater into Puget Sound have occurred since Feb. 16 at the plant, which has a designed wastewater treatment capacity of about 440 million gallons per day.

However, rainfall in Seattle totaling one inch or more over two or three consecutive days could lead to an emergency bypass of highly diluted stormwater and wastewater from the West Point plant.

Treatment plant operators are carefully monitoring weather reports and will watch rainfall totals.

If stormwater and wastewater volumes flowing into the plant appear to be approaching upper limit of the plant’s current treatment capacity, plant operators will to divert a portion of the incoming flow to other wastewater treatment facilities within King County’s system to avoid an emergency bypass into Puget Sound.

Keep up to date:
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