Why is a former vermiculite processing plant site being evaluated?
ATSDR is evaluating a number of sites throughout the United States where facilities received vermiculite from a mine in Libby, Montana. Vermiculite from Libby plants was found to contain asbestos.
The former Zonolite/W.R. Grace facility in St. Louis received Libby vermiculite between the late 1940s and 1988.

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