10b. Presentation - Clean-up Design for Middle Third of Lower Duwamish Wate
Item No. 10b supp Meeting Date: June 8, 2021 Clean-Up Design for the Middle Third of the Lower Duwamish Waterway Joanna Florer Kathy Bahnick Sandy Kilroy Lower Duwamish Waterway (LDW) Located in South Seattle through Seattle's industrial core and South Seattle residential neighborhoods of Georgetown and South Park Cleanup of the river helps improve environmental justice communities 2 LDW Cleanup Timeline 3 Lower Duwamish Waterway Cleanup Goals Reduce risks to: 1. People who eat resident fish and shellfish 2. People coming into contact with contaminated sediments 3. Bottom dwelling organisms: worms, crabs and clams 4. Fish, birds, and mammals (including salmon and orcas) 4 Cleanup Accomplishments Five "early actions" completed: Reduced average surface sediment Lower levels of polychlorinated biphenyl (PCB) contamination by 50% Targeted areas with the highest PCB contamination in the sediment Middle Cleaned up 29 acres of sediment Design of the Upper Third 2/3 complete Upper 5 5th Amendment to the Administrative Order on Consent (AOC) Cleanup Design for the middle third of the LDW - 1.5 miles Continue monitoring water and fish/shellfish tissue concentrations Continue to fund the seafood consumption advisory efforts Port's share of cost around $4-5M from the annual ERL authorization 6 Timeline of Current Activities 2019 2020 2021 2022 2023 2024 2025 2026 2027 Cleanup Design of the Upper Third (AOC4) Cleanup Design of the Middle Third and Ongoing Monitoring (AOC5) Seafood Consumption Advisory (AOC1, AOC3, AOC4, and AOC5) Cleanup Construction 7 Elements of the Cleanup Design Sediment sampling to define the extent of cleanup needed Determining the appropriate cleanup method Engineer design drawings and specifications 8 Another Notable Sediment Clean-up Milestone EPA's proposed clean-up plan for the East Waterway Superfund Site will be published this summer Adjacent and downstream of the LDW and is a separate cleanup Will also remove a considerable quantity of PCBs from the environment, to the benefit of people, salmon, and orcas 9
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