 This is being done to dry out a pile of saturated mining waste that's in danger of collapsing and falling into the river. ADEQ spokeswoman Josephine Marissa says over the next 90 days, they're going to install a pipeline. The Hasegawa River will resume its normal course downstream after exiting the pipeline. That's dangerous because the contamination that occurs from the runoff of the water, that carries heavy pollutants.