(1) All modifications to tier I systems must be submitted to the department for purposes of maintaining records of the approved versions of the approved system.

(2) Any proposed substantial modification of a tier I system or a series of minor modifications whose total result is substantial must meet all of the specific law or rule requirements in effect at the time of submission. The department's determination that a modification is substantial may be contested pursuant to the Montana Administrative Procedure Act.

(3) All modifications to tier II systems that modify the information or communication of the information required for tier II systems by ARM 23.16.2105(2) (b) (i) must be approved by the department.