To only allow an individual who has been designing both conventional and alternative designs to choose one or the other will harm that person's business. I recommend that if someone gains the AOSE license they are qualified to also do conventional systems. The regulatory text needs to read as such.

C. No person shall act as an conventional onsite soil evaluator, alternative onsite soil evaluator, conventional onsite sewage system installer, alternative onsite sewage system installer, conventional onsite sewage system operator, or alternative onsite sewage system operator without possessing a valid license issued by the board. Issuance of an alternative license shall void all previously issued conventional licenses. No licensee shall hold both a conventional and an alternative license simultaneously. The board shall issue a license only after an individual has met all experience and examination requirements as set forth in this chapter.

Note the definition of AOSE

"Alternative onsite soil evaluator" means an individual licensed by the board to construct, install, and repair a treatment works that is not a conventional onsite sewage system and does not result in a point source discharge.