What must be done to the container valve in a hazardous materials operation?

In a hazardous materials operation, the proper action for the container valve is to close it securely. This ensures that there is no risk of leaks or spills that could compromise safety. Closing the valve prevents the release of hazardous substances into the environment, which is essential for maintaining a safe operational area.

Opening a valve by hand can increase the risk of exposure to the hazardous material contained within, and it might not be necessary if the goal is to contain the substance. Ensuring that the valve is closed securely allows for better control over the contents and comprehensively reduces the potential hazards associated with accidental releases.

Maintaining clear labeling and performing regular inspections are important, but the immediate action regarding the container valve focuses on securely closing it to mitigate risks during hazardous materials operations.