From Superfund Site To Drinking Water Well

"For 17 years, more than 240 corporations and study groups have researched against the clock to contain the 26 billion gallons of contaminated groundwater sitting in the Berkeley Pit before it leaks into nearby aquifers and water surfaces... The Pit's sink reaches a depth of 1,800 feet, and the water level rises an average of 2 feet per month. In 1994, the Environmental Protection Agency and the Montana Department of Environmental Quality (MDEQ) established the Pit's critical water level — the point at which the water would leak into aquifers — at 5,410 feet."