(1) Except as provided in ARM 17.8.744, 17.8.745, and 17.8.1602, a person may not construct, install, modify, or operate any of the following without first obtaining a Montana air quality permit issued by the department: (a) a new facility or emitting unit with the potential to emit airborne lead in an amount greater than five tons per year or a modification to an existing facility or emitting unit that results in an increase in the facility or emitting unit's potential to emit airborne lead by an