The Act applies to any adversary adjudication pending before the Department at any time between October 1, 1981 and September 30, 1984. This includes proceedings begun before October 1, 1981 if final agency action has not been taken before that date, and proceedings pending on September 30, 1984, regardless of when they were initiated or when final agency action occurs, except that it shall not apply in any case pending on October 1, 1981 in which a decision has been issued, but final agency action has not been taken by reason of an abatement.