Portland gets OK to build Confined Aquatic Disposal (CAD) Cell April 16, 2021, by Eldin Ganic The City of Portland has received state and federal approvals to build Maine’s first Confined Aquatic Disposal (CAD) Cell in Portland Harbor to address long-term dredging needs. The City and its partners, the City of South Portland, the State of Maine, and the Portland Harbor Commission, have been working for years to find a solution for dredging the piers, wharfs and waterfront properties in Portland Harbor. “We’re losing the best berths in the Harbor,” said Bill Needelman, Portland’s Waterfront Coordinator. “Commercial vessels want to be in protected water and that’s where sedimentation is the most rapid.”