Although not a part of a Certified Payroll Report there is an additional record which must be maintained pursuant to Labor Code §1812 which states: 

Every contractor and subcontractor shall keep an accurate record showing the name of and actual hours worked each calendar day and each calendar week by each worker employed by him or her in connection with the public work.  The record shall be kept open at all reasonable hours to the inspection of the awarding body and to the Division of Labor Standards Enforcement.

This record, when deemed necessary, should be compared to the payroll reports in order to verify that all hours are consistent which are reported on each of the separate records.