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Enbridge built this 350,000 gallon temporary water tank (like a giant, above-ground swimming pool) to flush the pipelines as workers prepare to pressure test the west leg of the Line Five pipeline under the Straits of Mackinac on Thursday, June 8, 2017, in Mackinaw City, Mich. (Dale G Young/Detroit News via AP)

Enbridge built this 350,000 gallon temporary water tank (like a giant, above-ground swimming pool) to flush the pipelines as workers prepare to pressure test the west leg of the Line Five pipeline under the Straits of Mackinac on Thursday, June 8, 2017, in Mackinaw City, Mich. (Dale G Young/Detroit News via AP)

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