“Sections 3141–3144, 3146, and 3147 of title 40” substituted in subsec. (b) for “the Act of March 3, 1931 (40 U.S.C. 276a—276a–5, known as the Davis-Bacon Act)” on authority of Pub. L. 107–217, § 5(c), Aug. 21, 2002, 116 Stat. 1303, the first section of which enacted Title 40, Public Buildings, Property, and Works.