Lower Duwamish Waterway
|Arsenic||Polychlorinated biphenyls (PCBs)|
|Cadmium||Polynuclear Aromatic Hydrocarbons (PAHs)|
|Other semi-volatile organic compounds|
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 source control area include discharges from adjacent and upland properties. Transport pathways that could contribute to the contamination of sediments associated with the Restoration Areas 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.
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 Restoration Areas source control area. This plan describes the source control actions that are necessary to reduce the potential for sediment contamination.
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