Any variance or renewal thereof shall be subject to the following limitations:
(a) If the variance is granted on the ground that there is no practicable means known or available for the adequate prevention, abatement, or control of the pollution involved, it shall be only until the necessary means for prevention, abatement or control become known and available, and subject to the taking of any substitute or alternate measures that the Commission may prescribe.
(b) If the variance is granted on the ground that compliance with the particular requirement or requirements from which variance is sought will necessitate the taking of measures which, because of their extent or cost, must be spread over a considerable period of time, it shall be for a period not to exceed such reasonable time as, in the view of the Commission, is requisite for the taking of the necessary measures. A variance granted on this ground shall contain a timetable for the taking of action in an expeditious manner and shall be conditioned on adherence to such timetable.
(c) If the variance is granted on the ground that it is justified to relieve or prevent hardship of a kind other than that provided for in subsections (a) and (b), it shall be for not more than 1 year.History: 1972, PL 12-45 § 1, 2000, PL 26-22.