Okla. Stat. tit. 2, § 2-20-20: Exemptions applicable to certain operations

A. The provisions of Section 20-19 of this title relating to

setback requirements and the provisions of subsections B and C of

Section 20-12 of this title relating to utilization of liners in

retention structures or documentation of no hydrologic connection

and to a minimum separation of ten (10) feet between the bottom of

the retention structure and the maximum groundwater elevation shall

not apply to any concentrated swine feeding operation that is

licensed by or submitted a substantially completed application on or

before September 1, 1997.

B. Any expanding operations shall be in accordance with the

Oklahoma Swine Feeding Operations Act and rules promulgated pursuant

thereto.