(1) The presiding officer may grant a petition for intervention pursuant to RCW 34.05.443.

(2) A request to intervene will be handled as a prehearing motion and will be subject to the dates contained in the scheduling order. The presiding officer may allow intervention if:

(a) The intervenor is not a party to the matter but has a substantial interest in the outcome of the matter and the interest of the intervenor is not adequately represented by a party, or other good cause exists; and

(b) Any representative of the intervenor meets the requirements of WAC 246-10-108.

(3) A person will not be allowed to intervene if that person had notice of the agency's decision and, upon timely application, would have been able to appear as a party in the matter in which intervention is sought, but failed to make such timely application.

(4) If intervention is granted, the intervenor shall comply with this chapter on the same basis as the other parties to the proceeding, unless otherwise limited in the order granting intervention.