Okla. Stat. tit. 27A, § 27A-2-2-104: Board rules incorporating by reference federal

provisions - No effect on rules from subsequent changes in federal

provisions.

Insofar as permitted by law and upon recommendation from the

appropriate Council, rules promulgated by the Environmental Quality

Board may incorporate a federal statute or regulation by reference.

Any Board rule which incorporates a federal provision by reference

incorporates the language of the federal provision as it existed at

the time of the incorporation by reference. Any subsequent

modification, repeal or invalidation of the federal provision shall

not be deemed to affect the incorporating Board rule.