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West Point Treatment Plant restoration update for Wednesday, Feb. 22, 2017


Workers continue to make steady progress in restoring full operations at the West Point Treatment Plant – and a favorable weather forecast for only light showers through the end of the week means there should be no need for additional emergency bypasses during that time from the treatment plant.


Work continues around the clock to restore full operations at the West Point Treatment Plant, and the forecast for several more days of light precipitation means that any additional emergency bypasses of highly diluted stormwater and wastewater from the plant are unlikely.

Wastewater treatment is continuing at the plant, including screening, some solids settling and disinfection. This treated wastewater is being discharged through the plant’s deepwater outfall, which is roughly three-quarters of a mile offshore on the bottom of Puget Sound where currents provide continuous dilution.

No emergency bypasses of highly diluted stormwater and wastewater have occurred at the plant since early on Feb. 16.

The plant, which suffered an equipment failure early on Feb. 9 during a period of record rainfall, continues to have capacity to provide limited wastewater treatment for up to 250 million gallons per day – nearly double the amount needed to treat an average day this time of year, but well below the plant’s designed capacity of 450 million gallons per day.

Progress report for Feb. 22:
Employee safety is the top priority, and crews follow rigorous safety protocols that King County has put in place to ensure worker safety. Work is being done carefully and methodically.

• Crews have cleaned and sanitized about 95 percent of the treatment plant, and this work should be completed by the end of the day on Wednesday, Feb. 22. Electrical and mechanical workers have been entering cleaned and sanitized areas as they come available to assess damage, and restore or replace damaged equipment.

• Employees and contractors continue working on electrical and mechanical systems, including removing and rehabilitating pump motors. About 50 percent of this work has been completed.

• Workers continue cleaning and dewatering electrical conduits throughout the plant, and additional equipment has been brought in to help dry areas where heavy condensation can slow electrical assessments.

• King County engineers are working on the design and replacement of electrical panels, and consulting engineers are assisting in electrical restoration throughout the plant.

Upcoming weather:
The current weather forecast through the end of the workweek calls for scattered showers and low precipitation totals that are well below the 24-hour rainfall threshold that might trigger an emergency bypass.

West Point currently has capacity of providing limited wastewater treatment to roughly 250 million gallons per day. This is nearly twice the capacity needed to safely treat all of the stormwater and wastewater the plant receives on an average day for this time of year.

Rainfall amounts of one inch or more during a 24-hour period in Seattle could lead to an emergency bypass of highly diluted stormwater and wastewater from the West Point plant.

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