of the waste spill one week after the agency accidentally unleashed millions of gallons of toxic chemicals into the colorado river. picture you're looking at is at the gold king mine in silverton. if i believes now say polluted waters along the animas and san juan rivers are clearing up, but toxic spill is expanding, now making its way downstream hundreds of miles to the source. utah, and may take decades before we know the full impact. joining me now is a conservation analys analysis. >> good morning, jose. >> talk to me about this, there must be long-term concerns, right? >> yeah, look, what we do know is this, when the water was tested, mercury was ten times higher, beryllium, 33 times higher, and it's just awful, the san juan flows into the colorado, the colorado goes into lake powell, lake powell feeds