(1) All employers on public works contracts for construction services (including contractors and subcontractors) shall classify each employee who performs labor on a public works contract project according to the applicable standard prevailing rate of wages for such craft, classification or type of employee established by the commissioner, and shall pay each employee a rate of wages not less than the standard prevailing rate. In instances where an employee performs duties and tasks associated with other crafts for 30 minutes or less per day, the employee would still receive the appropriate rate of wages established for the employee's primary craft classification.