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Sediment Management Program
King County's Wastewater Treatment Division is carrying out a Sediment Management Plan developed in the late 1990s to remediate sediment contamination near county outfalls for combined sewer overflows, or CSOs, in Seattle. Those areas are contaminated with variety heavy metals (lead, copper, zinc), phthalates, polychlorinated biphenyls (PCBs), and hydrocarbons. Correcting those identified errors of the past will cost the county $26 million to $36 million. During the past 20 years, industrial discharges, stormwater discharges, and CSOs to Elliott Bay and the Duwamish River were reduced substantially. Despite that achievement, however, historical, persistent chemical contaminants in sediment continue to pose a risk to aquatic life, wildlife and human health. Areas with contaminated sediment exist near some CSOs now operated by King County. Most of that contamination is historical--from the first half of the 20th century. Since the 1960s, the county's Industrial Waste Program and CSO Control Program have dramatically reduced pollutants from CSOs. Sediment remediations projectsTo deal with sediment issues, King County is collaborating with other agencies and organizations to clean up the following contaminated sites in Elliott Bay and Duwamish Waterway:
View the program library for available documents on these projects. News releases
For more information
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Department of Natural Resources and Parks Updated: Jan. 25, 2008 |
Related Information: Lower Duwamish Waterway Programs WA State Dept. of Ecology Sediment Management Unit Elliott Bay/Duwamish River Restoration Program US Army Corps of Engineers Center for Contaminated Sediments Regional Wastewater Services Plan
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King County | Natural Resources & Parks | Wastewater Treatment Division Links to external sites do not constitute endorsements by King County. |