The US Environmental Protection Agency (EPA) and Minnesota Pollution Control Agency (MPCA) signed a project agreement to remediate contaminated sediment in the “ponds behind Erie Pier,” two backwater ponds surrounded by shallow marsh wetlands in Duluth, Minnesota. The sediment was primarily contaminated with PCBs, PAHs, mercury, and chromium.

Hired as the subcontractor of a joint venture, Brennan remediated 47,915 cubic yards of contaminated sediment in the two ponds near the Duluth-Superior Harbor in the St. Louis River Area of Concern (AOC). Our role consisted of dredging all contaminated sediment in the project area, dewatering the sediments on-site, and placing 6 inches of clean cap material over the dredged area. The cleanup reduced toxins in the “benthic” or bottom-dwelling community in the ponds, reducing the contaminants in the macroinvertebrates that live in the pond sediment and provide an important food source for fish.

We extend gratitude to all Brennan team members for their involvement in the Ponds Behind Erie Pier project. Thank you to the US Environmental Protection Agency, Minnesota Pollution Control Agency, Environmental Quality Management, Jacobs Solutions, and everyone involved on-site for making it successful.

Funding for this project was provided jointly by the EPA and MPCA as part of a multi-project task:
Contract #68HERH19D009
Task Project #68HE0521F0071

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J.F. Brennan Company, Inc. (Brennan) is a fourth-generation, family-owned marine construction firm specializing in environmental remediation, dam construction, commercial dive, harbor management, and submarine cable services. Working closely with public and private owners of water-based infrastructure since 1919, Brennan operates throughout the coastal and inland waterways of the United States.

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