Nothing in this chapter shall be held to limit or repeal additional requirements imposed by statute or otherwise recognized by law. No procedural requirement shall be mandatory as to any agency proceeding initiated prior to the effective date of this chapter. If any provision of this chapter or the application thereof to any person or circumstance is held invalid, such invalidity shall not affect other provisions or applications of the chapter which can be given effect without the invalid provision or its application, and to this end the provisions of this chapter are declared to be severable.
W. Va. Code § 29A-7-4