Chicago waterway to close again

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The U.S. Army Corps of Engineers is planning to close the Chicago Sanitary and Ship Canal Dec. 2 because of an influx of Asian carp working their way up to the Great Lakes and posing a threat to native ecosystems.

The canal could be closed for up to five days.

The Illinois Department of Natural Resources will release a pesticide called rotenone into the canal Dec. 3 and its progress will be tracked by potassium permanganate, which will increase its dissipation speed and neutralize the rotenone. Rotenone poses no danger to humans or to wildlife other than the Asian carp and other fish found in the waterway.

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