(1) (a) The period of employment may not exceed 8 hours a day for persons employed in or about cement plants and at quarries unless the employer and employee agree to a workday of more than 8 hours:
(i) through a collective bargaining agreement when a collective bargaining unit represents the employee; or
(ii) by mutual agreement when a collective bargaining unit is not recognized.
(b) Collective bargaining agreements covering cement plants and associated quarries that propose to extend the employment period beyond 8 hours a day must contain provisions that delineate the specific hours of work or other allowable situations agreed upon by the employer and the collective bargaining agent.
(2) Any person, corporation, agent, manager, or employer that violates a provision of this section is guilty of a misdemeanor and upon conviction shall be punished by a fine of not less than $50 or more than $600 or by imprisonment in the county jail for not more than 6 months, or both.