The records which a contractor or subcontractor is required to keep
concerning employment of employees subject to the Act are specified in
Sec. 4.6(g) of subpart A of this part. They are required to be
maintained for 3 years from the completion of the work, and must be made
available for inspection and transcription by authorized representatives
of the Administrator. Such records must be kept for each service
employee performing work under the contract, for each workweek during
the performance of the contract. If the required records are not
separately kept for the service employees performing on the contract, it
will be presumed, in the absence of affirmative proof to the contrary,
that all service employees in the department or establishment where the
contract was performed were engaged in covered work during the period of
performance. (See Sec. 4.179.)