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The U.S. Coast Guard has cleared BP to remove the containment boom in Lake Michigan after teams didn’t find any more oil during the latest search of the Lake’s shore following last weeks malfunction that caused a discharge into the water 20 miles south of Chicago.

A joint Coast Guard, BP, and U.S. Environmental Protection Agency assessment team checked the area near the Whiting refinery where the incident occurred, and found no visible oil on the shore or in the water.

BP estimates between 15 and 39 barrels of oil were discharged because of the malfunction.