191—3.11 (17A) Pleadings.
	 3.11(1) Petition for intervention requirements:
	  a.   	 Any petition required in a contested case proceeding shall be filed within 20 days of delivery of the notice of hearing or subsequent order of the presiding officer, unless otherwise ordered.
	  b.   	 A petition shall state in separately numbered paragraphs the following:
	 (1) 	 The persons or entities on whose behalf the petition is filed;
	 (2) 	 The particular provisions of statutes and rules involved;
	 (3) 	 The relief demanded and the facts and law relied upon for such relief; and
	 (4) 	 The name, address and telephone number of petitioner and petitioner’s attorney, if any.
	 3.11(2) An answer to a petition for intervention shall be filed within 20 days of service of the petition unless otherwise ordered. A party may move to dismiss or apply for a more definite and detailed statement when appropriate.
	  a.   	 An answer shall show on whose behalf it is filed and specifically admit, deny, or otherwise answer all material allegations of the pleading to which it responds. It shall state any facts deemed to show an affirmative defense and contain as many additional defenses as the pleader may claim.
	  b.   	 An answer shall state the name, address and telephone number of the person filing the answer, the person or entity on whose behalf it is filed, and the attorney representing that person, if any.
	  c.   	 Any allegation in the petition not denied in the answer is considered admitted. The presiding officer may refuse to consider any defense not raised in the answer which could have been raised on the basis of facts known when the answer was filed if any party would be prejudiced.
	 3.11(3) Any petition for intervention may be amended before a responsive pleading has been filed. Amendments to pleadings after a responsive pleading has been filed and to an answer may be allowed with the consent of the other parties or in the discretion of the presiding officer who may impose terms or grant a continuance.