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The river and bay bottom sediments are badly contaminated with thousands of pounds of toxic chemicals called PCBs (polychlorinated biphenyls), which continue to flow downstream and spread throughout Green Bay and Lake Michigan.
In an active, eroding river system it would be only a matter of time before the capping material (of sand or rock) wore away, especially in major storms and flooding.
Multiple dredging crews working on several parts of the river and lower bay at once could achieve major progress in less than 10 years, if the public support is strong enough to push for rapid action.
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