Crews assess next segment of the Caldecott Tunnel's fourth bore

03/29/2011 | Contra Costa Times (Walnut Creek, Calif.)

Crews began work to determine earth hardness, rock strength and other characteristics before carving the next 42-foot portion of the Caldecott Tunnel's fourth bore. "We do these probes because we want to know what lies ahead of us," said Ivan Ramirez, a Caltrans senior engineer.

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Contra Costa Times (Walnut Creek, Calif.)

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