Actions that must be undertaken immediately or within a time too short to allow full compliance with these rules, to avoid an imminent threat to public health or safety, to prevent an imminent danger to public or private property, or to prevent an imminent threat of serious environmental degradation, shall be exempt from the procedural requirements of this chapter. Such actions include, but are not limited to, the following:

(1) Emergency pollution control actions responding to accidental discharges, leaks or spills into the air, water, or land.

(2) Implementation of a change in waste disposal procedures caused by unanticipated changes in waste sources which are in compliance with federal and state regulations and standards.

(3) Cleanup or decontamination of the corporation's facilities or equipment accidentally exposed or contaminated, to permit maintenance, repair or relocation, when procedures followed are in accordance with federal or state guidelines, recommendations, or standards.

(4) Emergency actions implemented to reduce an imminent hazard to the public health or safety resulting from structural failure, accidental or intentional acts or omissions, equipment malfunction, human error or natural event.