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Source control area map

We defined 24 source control areas around the Lower Duwamish Waterway. We work with the Source Control Work Group to control sources of pollution (such as contaminated sites, stormwater, and combined sewer overflows) within these areas.

 

We developed a Source Control Action Plan (SCAP) for each source control area. Each SCAP identifies potential contaminant sources and transport pathways that may affect sediments. The plan evaluates the significance of these sources and their potential for recontamination of sediments, and identifies actions needed to control them. It also describes sampling and monitoring that will be conducted to identify any additional sources.

The Source Control Action Plan Handbook explains how the SCAPs were developed and the reason for some of the differences between earlier and later SCAPs and associated reports. In addition, it identifies some of the challenges that were encountered during this process.

Scroll down below the map to view the SCAP and related documents for each area, and to see which cleanup sites are located in each area. The Combined Sewer Overflow (CSO) Basins are being addressed under King County’s and City of Seattle’s CSO Control Plans.
This map shows the land area that drains into the Lower Duwamish Waterway, divided into 24 source control areas.

Lower Duwamish Source Control Areas

1. Spokane Street to Ash Grove Cement (River Mile 0-0.1 East)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

2. Duwamish/Diagonal Way Early Action Area (River Mile 0.1-0.9 East)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

King County's Duwamish Diagonal Sediment Remediation Project

3. Slip 1 (River Mile 0.9-1.0 East)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

4. King County Lease Parcels (River Mile 1.0-1.2 East)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

5. St. Gobain to Glacier Northwest (River Mile 1.2-1.7 East)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

6. Slip 2 to Slip 3 (River Mile 1.7-2.0 East)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

Cleanup sites within this area:

7. Slip 3 to Seattle Boiler Works (River Mile 2.0-2.3 East)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

Cleanup sites within this area:

8. Seattle Boiler Works to Slip 4 (River Mile 2.3-2.8 East)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

Cleanup sites within this area:

9. Slip 4 Early Action Area (River Mile 2.8 East)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

For more information about the early action cleanup, visit EPA's website.

Cleanup sites within this area:

10. Boeing Plant 2/Jorgensen Forge Early Action Area (River Mile 2.8-3.7 East)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

For more information about the early action cleanup, visit EPA's website.

Cleanup sites within this area:

11. Boeing Isaacson/Central King County International Airport (River Mile 2.8-3.7 East)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

Cleanup sites within this area:

12. Slip 6 (River Mile 3.9-4.3 East)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

Cleanup sites within this area:

13. Boeing Developmental Center (River Mile 4.3-4.9 East)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

14. Norfolk Combined Sewer Overflow/Storm Drain Early Action Area (River Mile 4.9 East)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

King County's Norfolk CSO Sediment Remediation Project

15. Spokane Street to Kellogg Island (River Mile 0-1.0 West)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

16. Glacier Bay (River Mile 1.3-1.6 West)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

Cleanup sites within this area:

17. Kellogg Island to Lafarge Cement (River Mile 1.0-1.3 West)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

Cleanup sites within this area:

18. Terminal 115 (River Mile 1.6-2.1 West)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

Cleanup sites within this area:

19. 1st Avenue S Storm Drain (River Mile 2.1 West)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

Cleanup sites within this area:

20. Trotsky Inlet (River Mile 2.1-2.2 West)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

Cleanup sites within this area:

21. Riverside Drive (River Mile 2.2-3.4 West)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

Cleanup sites within this area:

22. Terminal 117 Early Action Area (River Mile 3.4-3.8 West)

Source Control Action Plan

Property Reviews

For more information about the early action cleanup, visit EPA's website.

23. Sea King Industrial Park (River Mile 3.8-4.2 West)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps

24. Restoration Areas (River Mile 4.2-4.8 West)

Source Control Action Plan

Summary of Existing Information and Identification of Data Gaps