Source control area map

We have 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.

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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.

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Source control area map

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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