(1) The party served by the division shall have five working days from receipt of the petition in which to file a counter petition with the division.

(2) The party served shall file a counter petition when the party served disagrees with the appropriateness of the proposed unit as described in the petition.

(3) The petition shall contain:

(a) discussion of the nature of the disagreement with the petitioner(s) proposed appropriate unit;

(b) description of the served party's proposed appropriate unit;

(c) the number of employees in the served party's proposed unit;

(d) the expiration dates and brief description of any contracts covering any employees in the served party's proposed unit; and

(e) any other relevant facts.

(4) The division shall serve a copy of the counter petition upon the petitioner.