Petersburg officials are improvising as the North Harbor’s dredge material is more fluid than they expected.

Because copper levels were too high to dispose the spoils into the ocean, the original plan was to use the dredge material to cover the landfill’s scrap metal pile but Karl Hagerman, Public Works Director, stated in a report to the borough that when the project began September 12, “it was immediately evident that the material being delivered to the landfill was different than what the sanitation department was expecting.”

The Army Corp of Engineers tested the consistency of...