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West Point Treatment Plant restoration update for Friday, March 3, 2017


Restoration activities are continuing around the clock at the King County West Point Treatment Plant.


Crews working seven days a week are progressing toward full wastewater treatment function at the West Point Treatment Plant following the Feb. 9 equipment failure that reduced the facility’s wastewater treatment capabilities.

Progress report for March 3:
There are approximately 45 people at the treatment plant today, March 3, who are continuing the wastewater treatment restoration effort.

• Crews have removed more than 95 percent of pumps for inspection, cleaning, rewiring and refurbishment. Temporary motor control systems are in place.
• Nearly half of all electrical conduit in plant that was flooded following the Feb. 9 equipment failure has been cleaned, dried and tested.
• Local electrical control stations and panels are being installed as they come in.
• Temporary lighting consisting of several hundred LED fixtures has been strung throughout all of the plant’s tunnels where critical infrastructure repairs are being made.
• Crews have removed damaged insulation from about 45 percent of the heated pipe network in the plant.
• Work continues on the essential task of restoring heat to West Point’s secondary treatment system. Two boiler plants are undergoing refurbishment, and a temporary boiler is expected to come online next week. The boilers provide heat to the digester tanks that are the critical component of the secondary wastewater treatment process.

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 at the plant since Feb. 16.

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 the volume of stormwater and wastewater flowing into the plant appears to approach the upper limit of the plant’s current treatment capacity, plant operators will divert a portion of the flow coming to other wastewater treatment facilities and avoid an emergency bypass into Puget Sound.

The total estimated volume of the two emergency bypasses that occurred – first on Feb. 9, as a result of the initial equipment failure, and again on Feb. 15-16 during heavy rainfall – has been decreased from 310 million gallons to 235 million gallons.

The decrease from earlier estimates is the result of additional analysis of actual flow conditions heading to West Point.

Keep up to date:
Stay informed about restoration work at the West Point Treatment plant. Visit the incident response page, and sign up for email updates, and follow on social media:

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