Tests Show Concentrations of Cyanide near CFAC LandfillsNews Type: State, Regional, Federal Source: Daily Inter Lake
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Columbia Falls Aluminum Co. officials released more data in a meeting Wednesday night that further pinpoints old landfills north of the plant as being the primary culprits for pollution at the Superfund site.
Tests taken last spring and summer show one test well near the former drum storage area and the wet scrubber sludge pond with concentrations of 5,000 micrograms of cyanide per liter. To put that in perspective, the Montana safe water drinking threshold for cyanide is 200 micrograms per liter. That one well has 25 times the cyanide that’s considered safe for drinking water.
Another contaminant in the water is fluoride. Like the cyanide, fluoride concentrations are the highest at that well, as much as 40,000 micrograms per liter, which is 10 times the safe water drinking threshold.