621—4.3 (20) Bargaining representative determination (election petitions).
	 4.3(1) Form of petition. A petition for bargaining representative determination (election petition) shall be on a form provided by the board and shall be filed by delivery to the board. These petitions shall be of three types:
	  a.   	 A certification petition, filed by an employee organization requesting that through an election it be certified as the exclusive bargaining representative in an appropriate unit of public employees. The name of the employee organization which appears on the petition, or the petition as amended, shall be the name which appears on the election ballot.
	  b.   	 A decertification petition, filed by an employee requesting an election to determine whether a certified bargaining representative does, in fact, represent a majority of the employees in the bargaining unit, and
	  c.   	 A representation petition, filed by a public employer requesting an election to determine the bargaining representative, if any, of the employees in the bargaining unit.
	 4.3(2) Showing of interest—certification—decertification—intervention. Whenever a petition for certification or decertification is filed, or whenever intervention is requested for the purpose of being placed on an election ballot, the petitioner or intervenor shall submit therewith evidence that the petition or application for intervention is supported by employees in the unit in the following percentages: Thirty percent for certification or decertification and 10 percent for intervention in election proceedings. In petitions for certification or applications for intervention, such interest showing shall be dated and signed not more than one year prior to its submission; shall contain the job classification of the signatory; and shall contain a statement that the signatory is a member of the employee organization or has authorized it to bargain collectively on the signatory’s behalf. In appropriate cases, an authenticated dues checkoff list may be used for this purpose. In petitions for decertification, evidence of interest shall be as provided above and shall further contain a statement that the signatory no longer wishes to be represented by the certified employee organization. When a representation petition is filed by an employer, no show of interest will be required.
	 4.3(3) Determination of showing of interest. The public employer shall, within seven days of receipt of notice of a certification petition, submit to the board a list of the names and job classifications of the employees in the unit requested by the petitioner. The board shall administratively determine the sufficiency of the showing of interest upon receipt of the list. This determination, including the identification and number of signers of the showing of interest, shall be confidential and not subject to review, and parties other than the party submitting the interest showing shall not be entitled to a copy or examination of the showing of interest. If the employer fails to furnish the list of employees, the board shall determine the sufficiency of the showing of interest by whatever means it deems appropriate. In election proceedings where the petitioner withdraws its petition pursuant to subrule 4.1(3), in the presence of an intervenor, the election shall not be conducted unless the intervenor produces a 30 percent showing of interest within a time period determined by the board.
	 4.3(4) Notice. Upon the filing of a petition for certification, decertification or representation, the board shall furnish to the employer a notice to employees, giving notice to employees that an election petition has been filed and setting forth the rights of employees under the Act. Such notices shall be posted by the public employer in conspicuous places customarily used for the posting of information to employees.
	 4.3(5) Direction of election. Whenever an election petition is filed which conforms to these rules and the Act and the appropriate bargaining unit has been previously determined, an election shall be directed and conducted.
	 4.3(6) Intervention. See 4.1(2).