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American Indian tribes fighting the Dakota Access oil pipeline are asking a judge to shut down the line while more environmental review is conducted, but they've also presented a fallback plan should the judge disagree.

The "alternative relief" that Standing Rock Sioux attorney Jan Hasselmen "reluctantly" proposed in court documents filed Monday includes increased public reporting of pipeline issues such as repairs, and implementation of a spill response plan — including equipment staging — at the Lake Oahe reservoir on the Missouri River, from which the tribe draws its water.

"Neither the corps (of Engineers) nor DAPL has ever communicated with the tribes about spill response planning," Hasselman wrote.

The $3.8 billion pipeline built by Texas-based Energy Transfer Partners began moving oil from western North Dakota to a distribution point in Illinois on June 1, after President Donald Trump earlier this year pushed through its completion.