; and (2) the Secretary shall provide an opportunity for the process of informal consultation relating to a preliminary deficiency determination under section 2101. (f) Regulations (1) Interim regulations Not later than 1 year after the date of enactment of the Protecting and Securing Chemical Facilities from Terrorist Attacks Act of 2020 , the Secretary shall develop and issue interim final regulations, including guidance as necessary, under which an owner or operator of a covered chemical facility may apply to the Secretary for a waiver under subsection (a). (2) Final regulations Not later than 2 years after enactment of the Protecting and Securing Chemical Facilities from Terrorist Attacks Act of 2020 , and after consideration of comments received in response to the interim final regulations, the Secretary shall develop and issue a detailed final regulation for the waiver program under this section. (g) GAO review Not later than 3 years after the effective date of the interim final regulation prescribed under subsection (f)(1), the Comptroller General of the United States shall submit to the appropriate congressional committees a report on the waiver program under this section, including— (1) how effectively the Secretary has implemented the waiver program under this section, and recommendations for improvements; (2) the extent to which the waiver program under this section has— (A) resulted in cost savings to the whole of the Federal Government and covered chemical facilities; and (B) created any security improvements or deficiencies at covered chemical facilities; (3) recommendations for the Secretary to waive covered chemical facilities subject to the security requirements under other Federal regulatory programs and remove chemicals of interest from Appendix A to part 27 of title 6, Code of Federal Regulations, or any successor thereto, that are covered by the security requirements of other Federal regulatory programs