The chief executive officer-
(a) may require the applicant, at the applicant’s expense, to provide him or her by a given date with-
(i) any information, in addition to the information contained in the application; and
(ii) an independent review of that information by a person acceptable to the board;
(b) may direct that an investigation be conducted on the effect of the proposed safety permit on safe railway operations;
(c) may invite written comments from any organ of state which has an interest in the matter; and
(d) must afford the applicant an opportunity to make representations on any aspect of the safety permit application.