Current projections put the project completion 35-months behind schedule because of problems with a portion of the TBM constructed tunnel. The County is suing for $74M in damages associated with the delays. This massive sewer project involves the construction of a 13- to 14-mile treated waste pipeline constructed by TBM at depths of 40 to 440-ft. You can also see previous GeoPrac coverage of this project and its cost overruns, also here and here. [Source: SeattlePI via ASCE SmartBrief. Image: Seattle Times]
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Rising Costs and Delays in Seattle Area Wastewater Plant and Tunnels
February 25, 2008
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In keeping with our theme of rising costs on tunnel projects, the Brightwater sewage-treatment plant and treated waste pipeline project in King County Washington (Seattle area) is now up to at least $1.84 billion according to the lead consultant on the project. The treated waste pipeline is 13 to 14-miles long and at depths of 40 to 440-ft! It is being constructed nearly entirely by TBM. One source of delay was due to a tunneling subcontractor not being able to get parts (ball bearings?) because they were all being requisitioned by the US War Department for use in military equipment in Iraq and Afghanistan. Click through for information sources and links.
Bertha tunnel-boring machine arrives in Seattle
April 12, 2013
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