SEATTLE – The 900,000-pound machine that started boring a gargantuan sewage and stormwater tunnel under Seattle in 2021 at last burst into the open this month, completing its rocky 2.7-mile route in ...
A 21-ft, 8-in dia earth pressure balance tunnel boring machine has launched in Seattle to begin creation of a 2.7-mile-long tunnel that will store combined sewer overflow as part of the city's consent ...
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