For a decade, the people of Libby have longed for the day when they will be rid of the asbestos that turned their town into the deadliest Superfund site in America. Now they are being forced to live through the agony all over again, thanks to two giant piles of bark and wood chips on the edge of town. An Associated Press investigation found that the federal government has known for at least three years that the wood piles were contaminated.