This subpart prescribes policies and procedures for applying the requirements of 40 U.S.C. chapter 37, Contract Work Hours and Safety Standards (the statute) to contracts that may require or involve laborers or mechanics. In this subpart, the term “laborers or mechanics” includes apprentices, trainees, helpers, watchmen, guards, firefighters, fireguards, and workmen who perform services in connection with dredging or rock excavation in rivers or harbors, but does not include any employee employed as a seaman.