(1) Whenever a rule in this sub-chapter imposes a time limit within which an action must be performed and further provides that such time limit may be extended by the state veterinarian for good cause shown, the state veterinarian shall investigate the claim for a good cause and, upon finding that such good cause does exist and that no other livestock producer will suffer significant harm as a result of such action, a time extension for a period not to exceed 60 days may be granted.