40 CFR 305.11 - Consolidation and severance.
(a) Consolidation. The Presiding Officer may, by motion or sua sponte, consolidate any or all matters at issue in two or more proceedings docketed under this part where:
(1) There exist common parties or common questions of fact or law;
(2) Consolidation would expedite and simplify consideration of the issues; and
(3) Consolidation would not adversely affect the rights of parties engaged in otherwise separate proceedings.
(b) Severance. The Presiding Officer may, by motion or sua sponte, for good cause shown, order any proceedings severed with respect to any or all parties or issues.