Viaduct tunnel faces challenges, potential cost overruns

07/12/2010 | SeattlePI.com · Seattle Times, The

Worries about Seattle's Viaduct tunnel coming in over budget may not be unfounded, given these two reports. Globally, tunneling projects tend to cost about one-third more than originally estimated. And in Seattle, crews will confront glacially packed soil that makes boring a tunnel particularly challenging.

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SeattlePI.com · Seattle Times, The

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