The response action selected in this Record of Decision (ROD) is necessary to protect the public health or welfare or the environment from actual or threatened releases of hazardous substances into the environment. Such a release or threat of release may present an imminent and substantial endangerment to public health, welfare, or the environmentThis decision document presents the Selected Remedy for the In-waterway Portion of the Lower Duwamish Waterway Superfund Site, in King County, Washington. The Selected Remedy was chosen in accordance with the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), and to the extent practicable, the National Contingency Plan (NCP). This decision is based on the Administrative Record file for this site. The State of Washington, through the Washington Department of Ecology, concurs with the Selected Remedy.