This Order pertains to the in-water portion of the Lower Duwamish Waterway Superfund Site in Seattle, King County, Washington (?Site?). The Lower Duwamish Waterway Superfund Site also includes upland and adjacent areas (?Upland Areas?) that were and continue to be sources of contamination to the Site. Unless otherwise directed by EPA, Upland Areas are not currently subject to this Order. This Order directs Respondents to perform the remedial design and remedial action (?RD/RA?) selected in the Record of Decision (?ROD?) for the Site on November 21, 2014, and an Explanation of Significant Differences (?ESD?) for the Site on September 30, 2021.