The grievance procedure shall contain special provision for responding to grievances of an emergency nature. Emergency grievances shall be defined, at a minimum, as matters regarding which disposition according to the regular time limits would subject the inmate to a substantial risk of personal injury, or cause other serious and irreparable harm to the inmate. Emergency grievances shall be forwarded immediately, without substantive review, to the level at which corrective action can be taken. The procedure for resolving emergency grievances shall provide for expedited responses at every level of decision. The emergency procedure shall also include review by a person or entity not under the supervision or control of the institution.