[1]Seattle Tunnel Partners (“STP”), a joint venture of Dragados USA and Tutor Perini, entered into a $1.4 billion contract with the Washington State Department of Transportation (“WSDOT”) to replace the Highway 99 viaduct. In December 2013, a tunnel boring machine (“TBM”) bearing the moniker “Bertha,” then the largest TBM ever built, measuring 425 feet long and 57 feet in diameter, struck an underground pipe. Shortly after the impact, Bertha overheated and eventually could no longer make forward progress. A massive repair effort ensued causing a 2.5-year delay in reaching substantial completion.

WSDOT sued STP for the delay, seeking liquidated damages of $57 million. In response, STP argued its delay was excusable because it was caused by Bertha’s impact with the pipe, and the steel well casing was a Differing Site Condition (DSC) undisclosed in the contract documents. STP asserted counterclaims against WSDOT, alleging breach of contract and seeking $300 million in damages. Ultimately, a jury found that the steel well casing on the pipe was not a DSC, foreclosing STP’s excusable delay defense and counterclaims, and resulting in a $57 million verdict, plus interest, in favor of WSDOT.