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Webuild Begins Excavating Tunnel for Ship Canal Water Quality Project in Seattle, Washington

SEATTLE, WA — Webuild Group’s U.S. subsidiary, Lane, began excavating with the MudHoney tunnel-boring machine (TBM) the 2.7-mile storage tunnel for the Ship Canal Water Quality Project, an environmental sustainability project designed to prevent untreated stormwater and sewage from flowing into major bodies of water in Seattle, Washington. The TBM began at Ballard, the western end of the planned 18.1-foot diameter tunnel and will head toward Fremont and Wallingford.

In Seattle, the tunnel will prevent up to 75 million gallons of untreated stormwater and sewage — known as combined sewer overflow (CSO) — from flowing into the Lake Washington Ship Canal, Salmon Bay, and Lake Union every year. The tunnel will capture and temporarily hold more than 29 million gallons of stormwater and sewage during heavy rainfall.

The project is one of several being developed by Lane in the clean water sector in the United States, highlighting Webuild’s commitment to provide solutions for the sustainable management of water, such as hydraulic tunnels and treatment and desalination plants. These works bring potable water to areas that suffer from a lack of water, while protecting others from extreme weather.

Among Lane’s other projects, there is a Caloosahatchee basin storage reservoir to reduce harmful discharges into an estuary in Florida, and the Three Rivers Protection & Overflow Reduction Tunnel in Ft. Wayne, Indiana.

Webuild, the new group born in 2020 from Salini Impregilo, is a global construction player specializing in building large works and complex infrastructure for the sustainable mobility, hydroelectric energy, water, green buildings, and the tunnelling sectors.

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