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Portland Harbor CAD Cell

Supporting the working waterfront with the first contained aquatic disposal (CAD) cell in the State of Maine

  • Portland and South Portland, Maine

    Portland and South Portland, Maine

We completed initial design, surveys, and testing for a CAD cell in Portland Harbor, and are now working to permit the project

For years, the economic growth of Portland Harbor’s historic working waterfront was increasingly threatened by the lack of adequate berthing room due to shallow depth between piers, caused by decades of sediment accumulation. Something needed to change—that’s where we came in.

Wharf owners identified sediment buildup as a key barrier to economic growth and reinvestment—to help remedy this, we set out to create the first contained aquatic disposal (CAD) cell in the State of Maine. This solution would stimulate waterfront economic development by dredging and disposing sediments from berthing areas, some of which have not been dredged in over 70 years. 

Finding a CAD cell location in Portland Harbor required meeting sophisticated geotechnical, environmental, and engineering criteria. We completed bathymetric surveys, sub-bottom profiling, geotechnical borings, vibracore sampling, underwater video, and SCUBA surveys as part of the characterization of the proposed CAD cell site for both engineering feasibility and permitting. Working with the US Army Corps of Engineers, we developed a sampling strategy to test the CAD cell sediments for suitability for offshore disposal. 

Once the removed materials are cleaned for offshore disposal, Portland Harbor will have cleared berthing areas and a more secure economic future. 

At a Glance

  • City of Portland, Maine
Meet Our Team

Brooke Barnes, Principal, Environmental Services

Success is found in the space between us and our clients, coworkers, environment, and communities. Relationships are everything!
Brooke Barnes Principal, Environmental Services Read More

Kurt Howard, Senior Associate

Don’t focus on one path in your field. Keep an open mind and take new directions that are offered to you.

Michael Johnson, Vice President, Power Sector, Environmental Services (US)

It is beyond rewarding to team up with clients and colleagues to constantly improve and drive innovative solutions in the Power market.
Michael Johnson Vice President, Power Sector, Environmental Services (US) Read More

Brooke Barnes

Principal, Environmental Services

Kurt Howard

Senior Associate

Michael Johnson

Vice President, Power Sector, Environmental Services (US)

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  • Design your career

    Work with passionate people who are experts in their field. Our teams love what they do and are driven by how their work makes an impact on the communities they serve.

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