The project consisted of the cleanup of a large 2.5-acre site containing a former laundry and industrial dry cleaning facility in use from 1928 until 1985. The site is located three blocks south of Lake Union. Historical building status resulted in remediation and redevelopment requirements to comply with Seattle Landmark Regulations. Liability for aspects of the remediation was divided between multiple stakeholders. All aspects of the remediation process were conducted under review and approval both of Ecology and the public.
The property contained complicated geology that resulted in widespread distribution of contaminants. Site hazard risk assessment and sediment sampling revealed soil contamination, including land-banned and dangerous waste concentrations of PCE, extended to 65 feet below ground surface, and groundwater contamination extended at least 110 feet below ground surface. The project also included Source Control Actions and installation of a 520-foot groundwater supply well in the center of the historically designated building, and monitoring of that well. Redevelopment activities included seven additions to the historical building. SoundEarth personnel worked with the client’s counsel to facilitate entry into Ecology’s formal Voluntary Cleanup Program, and coordination of the means by which interim Remedial Actions (i.e., large-scale excavation of solvent- and petroleum-contaminated soil) could be completed without a formal public participation plan and review.
SoundEarth conducted the Phase I and II ESAs, RI, FS, CAP, Remedial Action, and prepared the SEPA Environmental Checklist. LUST File Review/Path Forward actions were performed for 20 USTs ranging in capacity from 350 gallons to 12,000 gallons. Our work also included the Remedial Design and construction of a stormwater management system.