Section Soil 209.01 - Intervention(a) A non-party may intervene in a matter pending before the board under the provisions of RSA 541-A:32, by filing a motion stating facts demonstrating that the non-party's rights or other substantial interests might be affected by the proceeding or that the non-party qualifies as an intervenor under any provision of law.(b) If the presiding officer determines that such intervention would be in the interests of justice and would not impair the orderly and prompt conduct of the hearing, he or she shall grant the motion for intervention.(c) Participation by intervenors shall be limited to that which is necessary to protect the interest identified in the petition for intervention.(d) Petitions for intervention shall be filed any time after commencement of a proceeding, and state:(1) The petitioner's interest in the subject matter of the hearing;(2) Whether the petitioner appears in support of the complainant, or the respondent, as well as for his or her own interest;(3) Why the interests of the parties and the orderly and prompt conduct of the proceeding would not be impaired; and(4) Any other reasons why the petitioner should be permitted to intervene.(e) A person filing a complaint that becomes the subject of a disciplinary hearing shall be served with the hearing notice and notified of the right to intervene in the proceeding.(f) Once granted leave to intervene, an intervenor shall take the proceeding as he or she find it and no portion of the proceeding shall be repeated because of the fact of intervention.N.H. Admin. Code § Soil 209.01