Sound Transit’s University Link Light Rail Seattle, Washington Twin-bore tunnels connect downtown Seattle with the University of Washington • Bored through massive retaining walls under I-5 • No significant settlements, no impact to I-5 traffic • Delivered early and under budget By threading its University Link light rail extension through 3 miles of twin-bore tunnels, Sound Transit circumvented surface traffic on one of the Pacific Northwest’s most congested corridors. HNTB, part of the integrated joint venture team of Jacobs Associates and AECOM, was contract manager for design of both the Interstate 5 undercrossing and the Capitol Hill to Pine Street tunneling, which concluded by boring into an active transit tunnel. To support massive retaining walls under I-5, HNTB designed four struc

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