Amgen Helix Campus
Hart Crowser provided geotechnical design/construction and environmental services to support development of 1.3 million square feet at this 40-acre campus. The project involved work at both Pier 88 and Pier 89 on the Seattle waterfront.
Phase 1. This phase included seven buildings in the City of Seattle Environmentally Critical Area for potential seismic hazards (soil liquefaction) and underground utilidors; along with shoreline protection, a pedestrian bridge, and pipe-jacked utility lines under BNSF railroad tracks. The scope included site historical review and mapping, in situ testing, geophysics surveys, seismic hazard mapping, seismic response spectrum for base-isolation design, pile foundations, ground improvement, shoring, and dewatering/drainage design.
Phase 2. The phase involved a 620,00-square-foot expansion. This included a seven-tier parking garage; six buildings, including three laboratory buildings, an office building, a small mechanical building and a warehouse; underground utility corridors, and other site improvements. Improvements to a pedestrian trail that runs along the boundary of the site were also done.
Environmental Engineering. The environmental scope included Phase I and II Environmental Site Assessments, soil and groundwater sampling and analyses, a contingency plan for disposal of contaminated soil, contaminated soil excavation monitoring, a stormwater management plan, and asbestos assessment and abatement. We provided extensive on-call construction soil testing and disposal evaluation support.
Base Isolation Design/Resilience. The project included seismic hazard mapping, seismic response spectrum for base-isolation design, pile foundation, ground improvement, shoring, and dewatering/drainage design.