Sediment contaminated with heavy metals and spread over 600 acres to cover even more dangerous mining waste at a Superfund site near Anaconda in western Montana appears unable to support vegetation.
The 2.5-million cubic yards of fine-grained sediment dredged from a former reservoir east of Missoula was spread 2 feet thick over a portion of a 5,000-acre Superfund site that holds mine and smelter wastes up to 50 feet deep.
Charlie Coleman of U.S. Environmental Protection Agency tells the Missoulian that this was the first year the agency expected to see the sediment covered with grass.
Officials say the sediment isn't posing a health hazard because it's covering the mine waste and doesn't appear to be blowing away as dust.
Chris Brick of the Clark Fork Coalition, a watchdog group, says the area should be capped with clean soil that will grow vegetation.
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