Final answer:
Hazmat cannot be kept on station over 24 hours without approval from the department.
Step-by-step explanation:
According to the United States Department of Transportation hazardous materials regulations and the Environmental Protection Agency's hazardous waste regulations, hazmat cannot be kept on station over the allotted 24-hour period unless it is approved by the department. This means that if there is a need to extend the storage period, it must be officially authorized. This is to ensure the proper handling, storage, and disposal of hazardous materials to prevent accidents and environmental damage.