Lower Duwamish Waterway
Source Control Investigation

Click on map to view larger size.Sea King Industrial Park
River Mile (RM) 3.8 to 4.2 West

Site Background 

The Sea King Industrial Park source control area is located along the western side of the Lower Duwamish Waterway (LDW) Superfund Site between RM 3.8 to 4.2 as measured from the southern end of Harbor Island.
The aerial photograph shows the area of interest. There are fifty-one upland properties that could potentially affect RM 3.8 to 4.2 West sediments.  Properties in this source control area include portions of Boeing South Park, tenants of Sea King Industrial Park, KRS Marine, Duwamish Yacht Club, Delta Marine and facilities in the S 96th Street storm drain basin.  


Sediments in the Sea King Industrial Park portion of the LDW have been impacted by chemical contaminants from various sources. Before reaching the LDW sediments, the contaminants may have affected other media including surface water, groundwater, soil, and air.

The following chemicals are considered to be contaminants of concern in the Sea King Industrial Park source control area.

Metals Organics
Mercury Polychlorinated biphenyls (PCBs)
Arsenic Polynuclear Aromatic Hydrocarbons (PAHs)
Zinc Dioxins/Furans
  Other semi-volatile organic compounds

Source Control

Ecology is the lead for source control for the LDW Superfund site. Source control is the process of finding and then stopping or reducing as much as possible releases of pollution to the river.

Potential sources of sediment contamination associated with the Sea King Industrial Park source control area include discharges from adjacent and upland properties. Transport pathways that could contribute to the contamination of sediments associated with the Sea King Industrial Park source control area include direct discharges via outfalls, surface runoff (sheet flow) from adjacent properties, bank erosion, groundwater discharges, air deposition, and spills directly to the LDW.

Source Control Action Plan

Ecology hired a contractor to put together a Summary of Existing Information and Data Gaps report.  Ecology and its contractor used the report to develop a Source Control Action Plan for the Sea King Industrial Park source control area. This plan describes the source control actions that are necessary to reduce the potential for sediment contamination.

Related Information

Additional Resources