(1) Hazardous waste management facilities located in Montana that possessed an effective final hazardous waste management permit issued by EPA prior to September 16, 1983 (the effective date of former ARM Title 17, chapter 54, subchapter 1) are considered to possess a valid Montana hazardous waste management permit for the duration of the unexpired term of the federal permit, if the facility remains in compliance with all the conditions specified in the federal permit and the requirements of this chapter.