Although the leak was reported as late as December 20, it is believed that it could have started in October. The nuclear power plant workers have not actually located the leak yet.
There is only the possibility that it may have leaked into the lake. This would have occurred if the oil leaked into the cooling tubes which draws water from the lake. One watchdog group is concerned that the power plant really does not know how much oil has been leaked.
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Source: http://www.chicagotribune.com/news/nationworld/chi-lake-michigan-oil-20150103-story.html
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Graphics: Mine
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Keywords: leak, oil, Donald C. Cook Nuclear Plant, Lake Michigan