California Code, Public Utilities Code - PUC § 466

Pursuant to Section 465, the contractor to whom the contract is awarded and any subcontractor under him shall pay not less than the specified prevailing wage to all workmen performing custodial or janitorial labor in the excecution   1 of the contract.

Each contractor and subcontractor shall keep an accurate payroll record, showing the name, address, social security number, work classification, straight time and overtime hours worked each day and week, and the actual per diem wages paid to each janitorial and custodial worker employed by him in connection with the contract.  The contractor's and subcontractor's payroll records shall be available for inspection at all reasonable hours, and a copy shall be made available upon request to the employee, or his authorized representative, and the Division of Labor Standards Enforcement.  After a complaint has been filed with the Division of Labor Standards Enforcement alleging that the contractor or the subcontractor has paid less than the prevailing wage, the contractor or subcontractor shall upon receipt of a written notice from the Division of Labor Standards Enforcement within 10 days file with the public utility and the Division of Labor Standards Enforcement a certified copy of the payroll records.