"BUTTE, Montana (Reuters) - Long before Hurricane Katrina inundated New Orleans with what officials describe as a dangerous toxic soup, Montana's mining capital struggled to deal with a massive watery hazard.
Even as bad as the sewage and chemical infested water around New Orleans may be, the Berkeley Pit, a toxic lake filling a 1-1/2 by 1 mile open pit mine in Butte (pop. 34,000) may pose an even greater long-term ecological risk.
The site, which includes land near the lake, is the largest
Superfund environmental clean-up project in the country in terms of area. The Superfund program, created in 1980 and run by the U.S. Environmental Protection Agency, seeks to clean up the worst U.S. hazardous waste sites..."
http://news.yahoo.com/s/nm/20050923/sc_nm/environment_montana_dcSo it goes.