The city may dig a hole, about 450 by 450 feet and 47 feet deep, between Lido Isle and Bay Island, to entomb material unfit for open ocean disposal.
Newport Harbor dredge spoils deemed too contaminated for disposal in the open ocean may be buried in a deep underwater hole not far from where they’ve accumulated.
The mercury-tainted sediment was found mostly near the turning basin and in the area near Lido Peninsula, reflecting a time when Newport had more shipyards and other industrial uses, according to maps that Harbor Resources Manager Chris Miller showed the city Harbor Commission and Water Quality and Coastal Tidelands Committee this month..
Instead, Newport may dig a hole, about 450 by 450 feet and 47 feet deep, between Lido Isle and Bay Island, to entomb the unfit material.“It’s actually preferred by the [federal] agencies,” Miller said. “The agencies have admitted to us that there are very limited, if not no options, for sediment disposal of unsuitable material in the region … in the immediate future.”Dredging is an interagency affair that also involves the U.S. Army Corps of Engineers and the Environmental Protection Agency.
Ideally, the next dredge will get Newport’s boating channels back to their intended depths of 10 to 20 feet. The most clogged areas have at least 5 feet of sediment to be removed, according to the city.
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