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Norfolk Combined Sewer Overflow (Duwamish River) Sediment Cap Recontamination, Phase I Investigation

Publication number Date Published
03-03-004February 2003
VIEW NOW Norfolk Combined Sewer Overflow (Duwamish River) Sediment Cap Recontamination, Phase I Investigation (Number of pages: 50) (Publication Size: 1MB)

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Author(s) Blakley, N.
Description Sediments were sampled for PCBs in the vicinity of the Norfolk CSO outfall on the Duwamish River, where a cleanup was conducted in 1999.

PCB-contaminated sediment found outside the cleanup area could potentially erode and migrate onto the clean backfill sediment cap. The contamination, located in the vicinity of a Boeing storm drain outfall, exceeds Sediment Management Standards. Below the outfall, PCB recontamination was found at one location within the cleanup area.

In addition, PCB contamination exceeded Sediment Management Standards outside the cleanup area between the Boeing storm drain and Norfolk CSO outfalls.
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Keywords investigation, county, study, river, sediment, standards, management, sediment management standards, contamination
WATERSHED Water Resource Inventory Area 09 Duwamish-Green
DATA Environmental Information Management (EIM) #NBLA0001


Quality Assurance Project Plan: Norfolk CSO Sediment Cap Recontamination Phase 1 Inspection