; 116 Stat. 2135) is amended by striking the item relating to section 2109 and inserting the following: Sec. 2109. Explosive materials. . 13. Changes in Appendix A to part 27 of title 6, Code of Federal Regulations (a) In general Title XXI of the Homeland Security Act of 2002 ( 6 U.S.C. 621 et seq.), as amended by section 12 of this Act, is amended by adding at the end the following: 2110. Changes in Appendix A to part 27 of title 6, Code of Federal Regulations (a) Definition In this section, the term Appendix A means Appendix A to part 27 of title 6, Code of Federal Regulations, or any successor thereto. (b) Notice of proposed rulemaking The Secretary shall publish a notice of proposed rulemaking in the Federal Register relating to any proposed change to Appendix A if the Secretary determines that— (1) a chemical should be designated as a chemical of interest under Appendix A; (2) a chemical designated as a chemical of interest under Appendix A should not be so designated; or (3) a chemical amount, concentration, or threshold quantity described in Appendix A should be modified. . (b) Technical and conforming amendment The table of contents in section 1(b) of the Homeland Security Act of 2002 ( Public Law 107–196 ; 116 Stat. 2135) is amended by inserting after the item relating to section 2109 the following: Sec. 2110. Changes in Appendix A to part 27 of title 6, Code of Federal Regulations. . 14. Assessment, report, briefing, and updated retrospective estimate on costs (a) Definitions In this section— (1) the term applicable committee means— (A) the Committee on Homeland Security and Governmental Affairs of the Senate; (B) the Committee on Homeland Security of the House of Representatives; and (C) the Committee on Energy and Commerce of the House of Representatives; (2) the terms CFATS regulation and covered chemical facility have the meanings given those terms in section 2101 of the Homeland Security Act of 2002 ( 6 U.S.C. 621 )