The Tunnel Replacing The Alaskan Way Viaduct (The Widest In The World), Commences With The Geotechnical Investigation

A half dozen drill rigs are currently at work in downtown Seattle boring holes 100 to 300 feet deep, sampling soils for the construction of the tunnel that will replace the Alaskan Way Viaduct. Once the test drilling is completed, the Washington State Department of Transportation will put the tunnel boring machine (custom built for the project the size of an aircraft cylinder) out for bid.

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