(a) Upon inspection or investigation of a workplace, if the Director or his or her authorized representative believes that a public employer has violated a requirement of this Act or a standard, rule, or regulation promulgated under this Act, he or she shall with reasonable promptness issue a citation to the employer. A citation shall: (i) be in writing, (ii) describe with particularity the nature of the violation and include a reference to the provision of the Act, standard, rule, or regulation alleged to have been violated, and (iii) fix a reasonable time for the abatement of the violation.
     (b) Each citation issued under this Section, or a copy or copies thereof, shall be prominently posted at or near the place at which the violation occurred as prescribed in rules adopted by the Director.
     (c) A citation shall be served on the employer or the employer’s agent by delivering a copy to the person upon whom the service is to be had, or by leaving a copy at his or her usual place of business or abode, or by sending a copy by certified mail to his or her place of business, or by sending a copy by email to an email address previously designated by the employer for purposes of receiving notice under this Act.
     (d) A citation may not be issued under this Section after the expiration of 6 months following the occurrence of any violation.