(A) An “emergency” means any situation arising from sudden and reasonably unforeseeable events beyond the control of the source which situation requires immediate corrective action to restore normal operation, and that causes the source to exceed a technology-based emission limitation under the permit, due to unavoidable increases in emissions attributable to the emergency. An emergency shall not include non-compliance to the extent caused by improperly designed equipment, lack of preventative maintenance, careless or improper operation, or operator error.

(B) An emergency constitutes an affirmative defense to an action brought for non-compliance with such technology-based emission limitations if the following conditions are met. The affirmative defense of emergency shall be demonstrated through properly signed, contemporaneous operating logs, or other relevant evidence that:

(C) In any enforcement proceeding, the permittee seeking to establish the occurrence of an emergency has the burden of proof.

(D) This provision is in addition to any emergency or upset provision contained in any applicable requirement.