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| Title | Norfolk Combined Sewer Overflow (Duwamish River) Sediment Cap Recontamination, Phase I Investigation | |||
| Month-Year Published | February 2003 | |||
| Online Availability |
1102 kilobytes, requires version 4.0 or later of Adobe Acrobat Reader Software get Acrobat Reader
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| Short 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. (Also see abstract below) | |||
| Publication Number | 03-03-004 | |||
| Author(s) | Blakley, N. | |||
| Print Availability | ||||
| Number of pages | 19 pp. + app (50 total) | |||
| Keywords | contamination, county, investigation, river, sediment, standards, study | |||
| Subject Waterbodies |
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| Related Publications | Title | Relationship | ||
| Quality Assurance Project Plan: Norfolk CSO Sediment Cap Recontamination Phase 1 Inspection | similar topic | |||
| Abstract | Long Description |
Sediments were sampled for PCBs in the vicinity of the Norfolk Combined Sewer Overflow (CSO) outfall on the Duwamish River, where a cleanup was conducted in 1999. The cleanup involved dredging of contaminated sediment and backfilling with clean sand. PCB-contaminated sediment found outside the cleanup area could potentially erode and move 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 general, results from this study are consistent with previous findings from post-remedial monitoring conducted by King County. However, PCB contamination also was found above Sediment Management Standards at one location not previously sampled by King County, between the Boeing storm drain and Norfolk CSO outfalls. |
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