A federal judge said Wednesday he won’t keep the U.S. Army Corps of Engineers from launching a full environmental study of the $3.8 billion Dakota Access pipeline’s disputed crossing under a Missouri River reservoir in North Dakota. U.S. District Judge James Boasberg denied Texas-based Energy Transfer Partners’ request to stop the Corps from proceeding until he rules on whether the company already has the necessary permission to lay pipe under Lake Oahe, the water source for the Standing Rock Sioux tribe.