(a) The Board may grant a petition to intervene in a proceeding set for modified procedure if intervention:

(1) Will not unduly disrupt the schedule for filing verified statements, except for good cause shown; and

(2) Would not unduly broaden the issues raised in the proceeding.

(b) The petition to intervene shall set out:

(1) The petitioner's interest in the proceeding;

(2) Whether the petitioner supports or opposes the relief sought or the action proposed or is otherwise concerned with the issues presented in the proceeding; and

(3) The petitioner's request, if any, for relief.