B’ at 18.) Vermillion County has been designated by U.S.
EPA as either an attainment area or “unclassified” for carbon
monoxide.
(Tr.
B at 24.) Cupola melting is used by GM to melt scrap metal. (Tr. B at 30.) In November 1988, GM filed thisvariance in order to continue the operation of the foundry whileit implemented corrective action to reduce the concentration ofcarbon monoxide in its emissions. (Tr. B at 39.) Emissions havedropped from a high ...
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