45 CFR 160.205 - Duration of effectiveness of exception determinations.
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An exception granted under this subpart remains in effect until:
(a) Either the State law or the federal standard, requirement, or implementation specification that provided the basis for the exception is materially changed such that the ground for the exception no longer exists; or
Title 45 published on 2014-10-01
no entries appear in the Federal Register after this date.