In addition to any other records required by reason of the Washington Minimum Wage and Hour Act, the educational institution shall keep and maintain the following records specifically relating to student workers employed at subminimum wage rates:

(1) Each student worker employed under a student worker certificate shall be designated as such on the payroll records kept by the institution, with each student worker's occupation and rate of pay being shown.

(2) The records required including a copy of any special certificate issued, shall be kept and made available for inspection at all times for at least three years from the effective date of the certificate.