US EPA announced that contaminated sediment removal will begin at Pier 4 by the Port of Tacoma; 40,000 cubic yards of contaminated sediments will be soon removed from Blair Waterway.
The Port of Tacoma will dredge an additional 500,000 cubic yards of clean sediment to make the base of the pier deeper as part of the pier expansion.
“In an effort to contain costs and remain competitive, shipping lines are increasing the size of the container ships, providing economies of scale. The planned upgrades to Pier 4 will allow Husky Terminal to handle two of the world’s largest ships simultaneously,” said Don Johnson, president of the Port of Tacoma Commission.
“Today, an estimated 1,500 jobs in Washington State are connected to the movement of cargo through Husky Terminal. These berth improvements will add capacity, creating the demand for additional family-wage jobs in the region.”
In 2013, an investigation performed by the Port of Tacoma showed that the fill material used to create the bulkhead under Pier 4 was contaminated with TBT.
The Port of Tacoma removed the Pier 4 deck and pilings between May and August and plans to dredge approximately 40,000 CY of contaminated sediments. The contaminated sediments will be dewatered and trucked to a waste disposal facility. The Superfund phase of the work is expected to be completed by April of 2016 with an overall cost of $19.3 million.
The Port of Tacoma consulted with the Washington Department of Fish and Wildlife and came to the conclusion that dredging would be least harmful to out-migrating fish if dredging started after the beginning of August.
“To minimize the potential for impacts to salmon while dredging the contaminated sediments, we worked with NMFS and WDFW to begin dredging in August to reduce the chances that a work extension would be needed to complete the cleanup when smaller, out migrating juvenile chinook salmon may be present,” said Scott Hooton, Port of Tacoma environmental project manager,
“We have also made detailed guidelines for how to operate the clamshell bucket to accurately dredge the required depth and area, as well as making sure the lid is fully secure before lifting through the water to minimize sediment loss.”
Once the contamination extraction is complete, the Port of Tacoma will begin the second phase of the Blair Waterway extraction and reconstruction. This phase includes additional piling removal, deck demolition, dredging and reconfiguration of the existing pier.
Pier 4 is located in the Blair Waterway within Commencement Bay, which is a major South Puget Sound waterway.
Source: US EPA
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