Each plume is a bit unique. In fact, one plume is extending into an area that will be mined out, so it will be returned into the pond systems. Another area occurred at a pond that had a potential to impact surface water. The pond was reclaimed and that impact was eliminated, at least in the long term. There is one plume that is still out there that probably has tens of years before it will approach any surface water body. I'm not sure what the company is going to do, but one approach would be to continue to monitor that plume to see if in fact this slow attenuation reduces the toxicity effectively.
Dr. Dixon has worked on some of the toxicity studies. I'll ask him how toxic the water is.