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IDX Tower Cleanup

IDX tower cleanup - large construction site

Farallon completed a cleanup action for the IDX Tower project in Seattle that included supervision of the characterization, segregation, and disposal of over 80,000 tons of petroleum-contaminated soil.

The cleanup action was conducted under Ecology’s Voluntary Cleanup Program and included supervision and coordination of field personnel; daily on-site meetings with the general contractor and subcontractors to coordinate the segregation, transport, and daily disposal of 3,000 to 4,000 tons of petroleum-contaminated soil over a 6-month period; and weekly and monthly reporting to Ecology and King County regulatory agencies.

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Prior to construction start-up, Farallon compiled a comprehensive list of disposal options for the petroleum-contaminated soil, which included a summary of costs and associated liabilities for each treatment, storage, and disposal (TSD) facility. Farallon then assisted the client in selecting an appropriate TSD facility. During construction activities, Farallon developed and implemented a Work Plan to characterize and segregate clean soil from petroleum-contaminated soil prior to excavation, which kept the overall construction project on schedule. Farallon also developed a stockpile resampling program at the TSD facility that reclassified petroleum-contaminated soil according to contaminant level, resulting in significant cost savings.

Implementation of Farallon’s Cleanup Action Plan significantly reduced total remediation costs and allowed the construction project to remain on schedule. The site was successfully remediated and received a No Further Action determination from Ecology. In addition, Farallon provided technical oversight in litigation support for cost-recovery efforts. Farallon's development of a conceptual site model demonstrating that off-site sources were the main contributor of contamination affecting the client’s site led to a successful mediation settlement for the client.

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Services Utilized

Construction Support

Our work is integrated with redevelopment design and construction at project sites that have involved deep excavations, steep slopes, and critical habitat areas. Our ability to conduct cleanup actions concurrently with redevelopment...

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headshot of J. Riley Conkin J. Riley Conkin Principal Geologist

Riley is a licensed geologist and licensed hydrogeologist in Washington with more than 25 years of experience in contaminant hydrogeology and cleanup. His expertise includes investigation and delineation of...

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