If the director finds that, because of conditions beyond control, necessary equipment is not obtainable with which to make changes necessary to reduce such discharge in extent or time, or both, than that permitted by Sections 8.28.020 through 8.28.040, he may prescribe other and different standards applicable to plants and equipment operated either by named classes of industries or persons or to the operations of separate persons.
(Prior code § 6.04.180 (Ord. 284 § 23, 1947))