Block 38 West cleanup site, Seattle

The Block 38 West site is located in Seattle’s South Lake Union neighborhood. Investigations found petroleum hydrocarbons, benzene, naphthalenes, carcinogenic polycyclic aromatic hydrocarbons (cPAHs), and metals in soil and groundwater above state standards. Most contamination was removed during interim actions tied to property redevelopment, which included large-scale soil excavation and disposal. Remaining contamination is contained under new pavement and building structures. Site restrictions will ensure the cleanup remains protective of human health and the environment.