The creek from Y-12 that ran into downtown Oak Ridge next to city hall through the park and on over towards the city pool was full of it years ago. I you look at it today there are still warnings it keep out of it due to chemical polutaints. They spent years cleaning up the mercury. I also am starting to believe that the fall out of power plants is dusting the polar caps with soot and that is to blame for a good majority of icecap melting glacial melting and such. If the mercury is in the soot it still concemtrated at the poles but it is still on the surface of the ice and has not gotten into the sealife. Just my thoughts.