Crossing below the Montlake Cut waterway and connecting the University District and Capitol Hill with downtown Seattle, the University Link extension is anticipated to add 71,000 riders to Sound Transit’s light rail system by 2030. Reducing design uncertainty and construction risks, Aspect’s geologic and hydrogeologic analyses for the 3.15-mile twin-rail tunnel and two deep underground stations contributed to the overall success of the tunnel boring project, which came in $100M under budget and 6 months ahead of schedule. Our dewatering analysis and construction oversight further helped the project sustain progress on schedule-critical construction elements.