Project: Canal Station
Condominium Cleanup & Development
Former New Wilson Ford
Canal Station was once the site of the New Wilson Ford car dealership. Although car dealership activities led to certain environmental conditions, the main environmental concern at the site was a groundwater plume originating off-site at a dry cleaner. Constituents in the groundwater plume were chlorinated solvents, including tetrachloroethene (PCE), trichloroethene (TCE), and (cis) 1,2-dichloroethene (DCE).
The developer purchased the property with the intent of developing a mixed-use condominium building after addressing the site environmental liabilities through the Voluntary Cleanup Program (VCP). CRETE principals developed the cleanup approach and negotiated a technical opinion letter with Ecology.
CRETE principals directed all aspects of the project,including:
- Phase I and Phase II site assessments
- Cleanup Action Plan preparation and review with Ecology
- Quarterly groundwater monitoring prior to construction
- Under-slab groundwater drainage system design
- Construction dewatering discharge authorizations from Metro King County and associated sampling and reporting
- Environmental cleanup construction oversight (i.e., removal of a leaking heating oil tank; removal of an oil-water separator containing dangerous waste)
- Excavation oversight and associated sampling
The groundwater remediation system consisted of a segregated under-slab groundwater collection system designed in conjunction with the building civil design and fully integrated into the development. Impacted groundwater is collected in a separate vault and is discharged to the sanitary sewer. A contingency for treatment of the groundwater was designed into the underground parking structure, but the contingency has not been triggered.
Work Performed
- Property transaction due diligence
- Regulatory negotiations - MTCA VCP
- Permitting - construction stormwater, Metro discharge
- Site cleanup design and redevelopment coordination
- Construction plans and specifications
- Construction oversight
- Construction stormwater management
Value Added
- Segregated and sampled soil so that most was sent off site as clean material
- Negotiated a technical opinion letter with Ecology
- Fully integrated the groundwater extraction system with development
- Designed and negotiated discharge to the sanitary sewer to minimize costs