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Hitachi progress under San Francisco Bay

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Published on Apr 4, 2012

Some five months into excavation, the Hitachi Zosen EPBM is more than 4,700ft or 18% into its drive on the 5 mile long water supply tunnel under the San Francisco Bay for the SFPUC. On a January 28, 2011 site visit, crews were navigating a pocket of bad ground that had slowed progress rates dramatically.

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