N.J. Stat. Ann. § 34:11-56.61

4. Each contractor and subcontractor shall keep an accurate record showing the name, classification, and actual hourly rate of wages and any benefits paid to each worker employed by him to perform building services pursuant to a State contract or subcontract, and shall preserve those records for two years after the date of payment. Each covered airport or related location employer shall keep an accurate record showing the name, classification, and actual hourly rate of wages and any benefits paid to each covered airport or related location employee, and shall preserve those records for two years after the date of payment. Such records shall be open at all reasonable hours to inspection by the Director of the Division of Purchase and Property and the commissioner.