Case Study: Seattle Center / Gates Foundation Remedial Design & Redevelopment

Client: Seattle Center Location: King County (Seattle), WA Contact for environmental projects: Doug Hillman

Project Background & Challenges

The Gates Foundation is purchasing a 12-acre parcel from Seattle Center. Both soils and groundwater on this parcel have been contaminated from decades of fuel-storage and vehicle-maintenance activities. To facilitate property transfer and redevelopment, the current owner wants to remediate groundwater at the site. Aspect Consulting was retained by the current property owner and as a member of the Shannon & Wilson team to lead these efforts.

Solution

Aspect helped characterize the site, evaluated remedial alternatives and costs, and conducted pilot tests to assess the effectiveness of the preferred remedy. We are currently designing full-scale remediation plans and working with the development team to integrate a cleanup system installation into construction activities. Our design features a soil vapor extraction/air sparging system that will be implemented in two phases—prior to construction (phase 1) and during construction (phase 2). This system will neither disrupt construction nor impact the developed campus.