The Port of New Bedford in Massachusetts is the number one commercial fishing port by value in the U.S., generating $11.1 billion in economic value each year by supporting a blend of commercial, industrial, and recreational opportunities. Some of the port’s historic manufacturing activities have resulted in high concentrations of PCBs, or polychlorinated biphenyl, a toxic compound once widely used in hundreds of industrial and commercial applications, and heavy metals. Since being designated a Superfund site in 1988, the Environmental Protection Agency, the Massachusetts Department of Environmental Protection, and the port have dredged approximately 1.4 million cubic yards of contaminated sediment from the harbor through the use of Confined Aquatic Disposal (CAD) cells.
Foth was engaged in 2018 to undertake three major initiatives.
The construction of CAD Cell No. 4 in the lower harbor area included dredging and disposal of a top layer of PCB- and heavy metal-impacted sediments into existing CAD cells, disposal of a middle layer of suitable (clean) materials at the approved offshore disposal site, and beneficial reuse of a bottom layer of structurally suitable dredged materials as both backfill at the North Terminal extension site and capping material for an existing CAD cell.
The North Terminal extension is designed to meet the infrastructure needs of commercial fishermen, the offshore wind industry, and other port users. Foth designed the terminal extension, including construction of a cellular cofferdam bulkhead, construction of a pile-supported concrete deck, installation of stormwater, electrical, lighting, and water utilities, backfill and compaction of the cofferdam footprint and site infield area, and finished grading of the proposed site to create new upland terminal area.
Services provided from conceptualization to construction included:
At the completion of the construction of CAD Cell No. 4, the Phase V navigational dredging project will be conducted at more than 40 commercial and residential sites along the New Bedford and Fairhaven shoreline. The cleanup effort will provide a major boost to the local economy by maintaining berths and stimulating development of shoreline sites with improved navigable access.
Foth’s expertise in dredging, management of contaminated sediments, marine infrastructure and port development provides significant value to the port, optimizing the environmental cleanup, navigation and commercial uses within the harbor. Funding for the project included local, state and federal sources totaling over $52M.
Markets: Waterfront and Marine