Here are helpful resources about the Portland Harbor Superfund Site
Updates
The Pre-Final 90% Remedial Design package has been completed – October 2025
- Pre-Final 90% RD – Volume I – Design Criteria Report
- Pre-Final 90% RD – Volume II – Plans
- Pre-Final 90% RD – Volume III – Specifications and Drawings
The Draft 50% Remedial Design package has been completed – March 2025
- Draft 50% RD – Volume I – Design Criteria Report
- Draft 50% RD – Volume II – Plans
- Draft 50% RD – Volume III – Specifications and Drawings
The Final Sufficiency Assessment Report – February 2025
The Remedial Design Work Plan – February 2025
EPA 9/11/24 Portland Harbor Information Session: Swan Island Basin Project Area Focus
Sampling completed
Environmental samples have been collected in the Swan Island Basin Project Area from riverbanks, sediments, and stormwater. In addition, hydrodynamic, geotechnical, and habitat conditions were studied. The information gathered will be used to design the remedy for the Swan Island Basin Project Area.
2,340 Total Samples Collected
- 267 Sediment Cores – over 1,000 samples
- 311 Soil Cores
- 420 riverbank samples
- 33 stormwater samples
- 26 stormwater solids samples
Pre-Design Investigation
Using environmental samples taken in 2022 and 2023 A work plan and evaluation report for the Swan Island Basin area were completed.
Basis of Design Report
The Basis of Design report identified remedial technologies and how they may be used in the cleanup. It also includes a conceptual site model and evaluates the design will consider constructability, structural, flood and climate change, and habitat impacts.