SEATTLE: Groundwater flow affects boring work

December 21, 2013 

The contractors drilling a tunnel under downtown Seattle say so much groundwater is flowing into the tunnel it will take another few weeks before they can look at what’s blocking their boring machine.

Chris Dixon of Seattle Tunnel Partners told The Seattle Times that a sealed-off chamber is almost full of water, even though six wells have been dug to try to pump water away from the machine.

The state Department of Transportation wants to see what mystery object stopped the machine Dec. 6.

The object is thought to be an unstable boulder, or a giant rock brought along by a glacier sometime in the distant past.

The machine is about 60 feet under Seattle streets and about one-tenth of the way toward completing a 1.7-mile tunnel.

The Associated Press

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