Here is what needs to be done NOW! Get the local counties, states and indian tribes to hire a private organization to get out there and stem that flow downstream.
They could use mill felt..a type of screen used in paper mills in the primary part of making paper. Get that felt out and install it halfway across the river in a part of the river that is slow and shallow. Halfway across one side, then halfway across downstream a ways. Make that water zigzag so the water flows into that felt which will collect at least some of the contaminates. Do this in as many places as can be done. Then take portable drudges and suck the contaminates off the screens (felt) and discharge it into containment ponds dug Along the river banks about 2 to 300 feet from the water edge. Let that water stay and evaporate. What would be left is the contaminates.
What this would require is the mill felt/screen, piling material such as 7x9 timbers by whatever length, a pile driver. excavators to dug the retaining ponds and liner to line the bottom.
I fear its is too late as the finger pointing has begun and they are busy wringing their hands.
I have seen these things done and it works.
Excellent point!
But it got into lake Powell sometime on Sunday; they told people in the San Juan arm of Lake Powell not to drink or swim in there.