Georgetown Steam Plant Characterization and Interim Action
The characterization of soils at the Georgetown Steam Plant, and subsequent interim cleanup action, grew out of Integral’s site investigation and remedial design work in Slip 4, located within the Lower Duwamish Waterway CERCLA site in Seattle, Washington. The primary chemical of concern in Slip 4 sediments is PCBs which may have been transported to the slip via storm drains from North Boeing Field and a steam plant flume. As part of a broad investigation of potential sources to Slip 4, Integral identified eroding soils with elevated PCBs along one corner of the Georgetown Steam Plant property.
These soils may have entered one of several storm drains that eventually discharge to Slip 4. After delineating the eroding area with elevated PCBs, Integral developed a design for an interim removal action, prepared construction bid specifications, and oversaw construction. Integral also developed and conducted a groundwater monitoring and soil sampling program to address contamination on other areas of the site.
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