South Park Marina

Last updated: 9/3/2026

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We, along with the Potentially Liable Parties (PLPs) for the South Park Marina Site: South Park Marina Limited Partnership, the Port of Seattle, and the City of Seattle prepared the following documents for public comment from March 9 - April 22, 2026:

Remedial Investigation Report (RI): Describes contaminants at the Site and where they are located. Read the report in the following sections: 

• Text
• Tables & Figures
• All Appendices (except G)
• Appendix G (Part 1) (Part 2)

Agreed Order Amendment (AO): This extends the current legal agreement that requires the PLPs to continue cleanup work by preparing a feasibility study that compares cleanup options, and by drafting a cleanup action plan, describing our selected cleanup option.

We have reviewed and responded to all the comments from our spring 2026 comment period. Minor changes were made to the remedial investigation document. The specific sections that were changed are listed in our response to comments document. The final remedial investigation and signed agreed order amendment will be uploaded to this webpage in the coming weeks. Work will now begin on a study of cleanup options for this site, called a feasibility study.  

Read the fact sheet. 

The Site is located along the Duwamish River in an area of the LDW Superfund Site called the Upper Reach. A variety of commercial and residential uses have occurred on the Site dating back to 1918 including a gas station, automobile repair shop, a tire retail store, and a mobile home park.  From 1946 to 1960, the A&B Barrel Co. operated a drum reconditioning facility at the Site, which included an unlined pond used for liquid waste disposal. The A&B Barrel Co. facility was destroyed by a fire in 1960 and the pond was filled in shortly after. 

The Site has been primarily used for marina operations and has remained in continuous operation since 1961. In 2021, a fire destroyed several marina buildings and boats in the southern portion of the Site.
  

The RI divides the Site into three areas. The investigation found the following contamination in those areas: 

South Area: 

• Deep contamination: A wide range of contaminants in soil and groundwater to depths up to 18 feet in the Former A&B Barrel Pond, including metals, polychlorinated biphenyls (PCBs), dioxins and furans, polycyclic aromatic hydrocarbons (PAHs), petroleum, semivolatile organic compounds (SVOCs), volatile organic compounds (VOCs), and chlorinated pesticides.
• Shallow contamination: PCBs, metals, petroleum, PAHs, and VOCs in soil surrounding and west of the Former A&B Barrel Co. Pond, generally limited to depths of 2 feet but with a few areas up to 6 feet.

Central Area: 

• PCBs, PAHs, and metals in soil as well as a few detections of SVOCs, VOCs, dioxins and furans, and chlorinated pesticides
• Dallas Ave S Area: Higher concentrations of PCBs and PAHs at depths less than 2 feet. 

Northwest Area: 

• Gasoline-range petroleum in soil to 15 feet.
• Tetrachloroethene (PCE) in groundwater likely from a former drycleaner (Cleanup Site ID 16765) next to this Site. 

Source Control Findings:
After reviewing the data, it was determined the Site does not present a risk of recontaminating LDW sediments in the near-term and will not need an Interim Action (partial, expedited cleanup). 

The next step in the cleanup process for this Site is the creation of a Feasibility Study where different cleanup options will be evaluated, and a preferred alternative will be selected. This document will also be released for a public comment period. This work began in fall 2026.

The South Park Marina Site is near the Lower Duwamish Waterway Superfund Site, which includes a 5-mile stretch of the Duwamish River. The U.S. Environmental Protection Agency (EPA) added the LDW Superfund Site to the Superfund National Priorities List in 2001. Ecology is working to stop or reduce sources of contamination to the LDW Superfund Site, an effort known as “source control,” so that the EPA can proceed with the cleanup of the river sediment. The sediment cleanup sites are grouped together by reach (stretch of river), and the upper reach (the upstream end of the LDW) was the first to begin sediment cleanup which started in 2024.