29 C.F.R. § 5.22
The Davis-Bacon Act and the prevailing wage provisions of the statutes referenced in § 1.1 of this subtitle confer upon the Secretary of Labor the authority to predetermine, as minimum wages, those wage rates found to be prevailing for corresponding classes of laborers and mechanics employed on projects of a character similar to the contract work in the area in which the work is to be performed. See the definitions of the terms "prevailing wage" and "area" in § 1.2 of this subtitle. The fringe benefits amendments enlarge the scope of this authority by including certain bona fide fringe benefits within the meaning of the terms "wages", "scale of wages", "wage rates", "minimum wages", and "prevailing wages", as used in the Davis-Bacon Act.
29 C.F.R. §5.22