23 C.F.R. § 650.509
(a) A Program Manager shall, at a minimum:
(b) A Team Leader shall, at a minimum:
(1) Meet at least one of the four qualifications listed in paragraphs (b)(1)(i) through (iv) of this section:
(iii) Have all of the following:
(iv) Have all of the following:
(e) A nationally certified tunnel inspector shall:
(f) Acceptable tunnel inspection training includes the following:
(g) In evaluating the tunnel inspection experience requirements under paragraphs (a) and (b) of this section, a combination of tunnel design, tunnel maintenance, tunnel construction, and tunnel inspection experience, with the predominant amount in tunnel inspection, is acceptable. Also, the following criteria should be considered: