What precaution should be taken before proceeding with an overturned aluminum MC-306/DOT-406 tank?

Ensuring that the contents of the overturned aluminum MC-306/DOT-406 tank have been removed is crucial for a safe response. This tank is designed to transport liquids and can carry hazardous materials. If the contents are not removed prior to intervention, it poses a significant risk of leakage, which can lead to environmental hazards, health risks to responders, and further complications during the recovery process.

Confirming that the tank is emptied or the contents are contained allows for a more controlled and safer operation during the recovery and clean-up efforts. This helps minimize exposure to potential hazards for both the response team and the surrounding environment.

Options involving immediate environmental release or trying to address the situation without proper assessment could lead to severe consequences, including contamination, injury, or fatalities. Additionally, while assessing the number of people around the scene is important, it is not sufficient as a primary precaution when dealing with hazardous materials in a compromised tank. Hence, ensuring the removal of contents is the most prudent choice to ensure safety and effective handling of the situation.