Which is NOT a requirement of the Transportation of Dangerous Goods Regulation when shipping dangerous substances?

The correct choice is based on the requirements set forth by the Transportation of Dangerous Goods Regulation, which outlines specific criteria for the safe shipment of dangerous substances.

Inclusion of "dry ice" in a sealed container is indeed a necessary procedure for ensuring that dry ice, categorized as a dangerous good due to its sublimation into carbon dioxide gas, is transported safely. However, the regulation allows for certain exemptions or conditions under which dry ice can be shipped, including not needing to be placed in completely sealed containers as long as the packaging is designed to allow the gas to escape.

On the other hand, the other requirements—having a completed "shipper's declaration" document, providing emergency contact information, and ensuring specific package labeling and hazard symbols—are critical and mandatory elements in the transportation of dangerous goods. The shipper's declaration formally indicates that the goods being shipped are classified as dangerous, emergency contact information ensures that immediate assistance can be obtained if needed, and proper labeling and hazard symbols visually communicate the risks associated with the material to handlers and emergency responders.

Thus, while careful handling and transportation is critical, the requirement pertaining to dry ice does not align strictly with the overarching regulations as it maintains flexibility under certain stipulated conditions.