567—134.18 (455B) Applicability of Part C. All persons and companies that are currently licensed under the former board rules in 591—Chapter 15 shall be subject to Part C of this chapter. All persons conducting underground storage tank installations and installation inspections as provided in 567—subparagraph 135.3(1)“e”(2) and installers, installer inspectors and testers required to be licensed under board rules shall be licensed by the department in accordance with this chapter.