Webuild Group’s U.S. subsidiary, Lane, began excavating with the MudHoney TBM the 2.7-mile (4.2-m) 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-feet (5.5 m) diametre tunnel and will head towards Fremont and Wallingford.   

In Seattle, the tunnel will prevent up to 75 million gallons (276 million litres) 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 (109.8 million litres) of stormwater and sewage during heavy rainfall.   Click here  and us/127 for more detailed information and project news in the tunnelbuilder archive.  Visit http://www.seattle.gov/ and https://www.webuildgroup.com/en/. 32/21.