December 2019 Vol. 74 No. 12


Lane Construction

Lane Construction Corporation, the U.S. subsidiary of Salini Impregilo Group, won its first contract in the state of Washington to build a water storage tunnel to reduce polluted overflows into the Seattle, Washington Lake Washington Ship Canal. The contract is valued at $255 million.

Sewage and stormwater from many older parts of Seattle, including the Ballard, Fremont, Wallingford, and Queen Anne neighborhoods, is collected and conveyed in one set of pipes. In dry weather conditions, all sewage flows to a local wastewater treatment plant. During wet weather conditions, polluted runoff can exceed the pipes’ capacity and send a mixture of stormwater (90 percent) and sewage (10 percent) to outfalls that flow into the nearest water body. These combined sewer overflows (CSOs) contain contaminants that can make people sick and harm fish, wildlife and the environment.

The 2.7-mile, 18-foot, 10-inch internal diameter tunnel, known as the Ship Canal Water Quality Project –Storage Tunnel project, will keep an average of more than 75 million gallons of polluted stormwater and sewage out of the Lake Washington Ship Canal, Salmon Bay, and Lake Union each year. Construction work is expected to start December 2019 and be completed in 2023.

Lane Construction Corporation is one of America’s leading construction companies, specializing in large, complex civil infrastructure and a pioneer in the use of design-build and public-private partnership methods of project delivery. Based in Cheshire, Conn., it is wholly owned by Salini Impregilo, a global infrastructure group headquartered in Italy.

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