Alaskan Way Viaduct
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The open dirt area in the center of this photo taken Friday, Feb. 28, 2014, next to the Alaskan Way Viaduct in Seattle is the approximate area where a large shaft may have to be dug to repair the massive tunneling machine, which is currently underground and awaiting fixing, before being able to continue digging a tunnel to replace the viaduct. An official said Friday that a six-month delay in the project was a "slightly optimistic" forecast. (AP Photo/Ted S. Warren)

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This Friday, Feb. 28, 2014 photo shows an open dirt area next to the Alaskan Way Viaduct in Seattle that is the approximate area where a large shaft may have to be dug to repair the massive tunneling machine, which is currently underground and awaiting fixing, before being able to continue digging a tunnel to replace the viaduct. An official said Friday that a six-month delay in the project was a "slightly optimistic" forecast. (AP Photo/Ted S. Warren)

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In this Feb. 25, 2014 photo provided by the Washington Dept. of Transportation, temporary concrete rings used to help the massive tunneling machine being used to dig a waterfront tunnel to replace the Alaskan Way Viaduct in Seattle are shown. WSDOT says that over the next couple of weeks, the rings will be removed, making room for construction of the double-decker highway inside the tunnel. (AP Photo/Courtesy Washington Dept. of Transportation)

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In this Feb. 25, 2014 photo provided by the Washington Dept. of Transportation, temporary concrete rings used to help the massive tunneling machine being used to dig a waterfront tunnel to replace the Alaskan Way Viaduct in Seattle are shown. WSDOT says that over the next couple of weeks, the rings will be removed, making room for construction of the double-decker highway inside the tunnel. (AP Photo/Courtesy Washington Dept. of Transportation)

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In this Feb. 25, 2014 photo provided by the Washington Dept. of Transportation, a "cut and cover" portion of the waterfront tunnel being dug to replace the Alaskan Way Viaduct in Seattle is shown. (AP Photo/Courtesy Washington Dept. of Transportation)

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In this Feb. 25, 2014 photo provided by the Washington Dept. of Transportation, a "cut and cover" portion of the waterfront tunnel being dug to replace the Alaskan Way Viaduct is shown with the city of Seattle skyline in the background. (AP Photo/Courtesy Washington Dept. of Transportation)

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In this Feb. 25, 2014 photo provided by the Washington Dept. of Transportation, the launch pit that was used to start the massive tunneling machine being used to dig a waterfront tunnel to replace the Alaskan Way Viaduct in Seattle is shown. WSDOT says that over the next couple of weeks, workers will be making room for construction of the double-decker highway inside the tunnel. (AP Photo/Courtesy Washington Dept. of Transportation)