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To: Poet who wrote (11216)1/8/2009 4:53:01 PM
From: Jorj X Mckie1 Recommendation  Read Replies (1) | Respond to of 33421
 
Fly ash isn't really considered a toxic material as long as you aren't breathing it in.

Wikipedia has a pretty good description
en.wikipedia.org

Considering the location of the spill, it is a pretty good bet that the fly ash was created from the burning of bituminous coal and therefore it is class F fly ash.

Fly ash has commercial uses, which would imply that it isn't overly toxic. I imagine that if you were encased in a flood of fly ash, it would be much like be stuck in a lahar (a volcanic mudflow). this would probably be pretty detrimental to one's health.