Provided, however, that no swine feeding operation pursuant to this subparagraph is a concentrated swine feeding operation if the swine feeding operation discharges only in the event of a twenty-five-year, twenty-four-hour storm event, c. the Board determines that the operation is a significant contributor of pollution to waters of the state pursuant to Section 20-6 of this title, or d. any new swine feeding operation established after November 1, 2011, with more than one hundred (100) animal units;
Okla. Stat. tit. 2, § 20-3