Who must monitor cargo tanks while loading or unloading?

The requirement for monitoring cargo tanks during loading or unloading is crucial to ensure safety and compliance with hazardous materials regulations. The correct answer emphasizes that a qualified person must be present within a specified distance (25 feet) of the tank. This is to ensure that someone who has the necessary training and knowledge is able to respond appropriately to any potential hazards or emergencies that may arise during the operation, such as leaks or spills.

Having a qualified person nearby helps ensure that they can monitor the process for safety compliance, handle any equipment malfunctions, and make informed decisions if an emergency occurs. This individual is typically trained in the specific risks associated with the materials being loaded or unloaded, which is essential for maintaining a safe environment.

Other options, such as anyone nearby or just the driver being responsible, do not ensure that a knowledgeable individual is present to manage the specific risks associated with hazardous materials. A security officer may also lack the necessary training in handling hazardous materials, making them an unsuitable choice for monitoring during these operations. Thus, the emphasis on having a qualified person present underscores the importance of safety and regulatory compliance in hazardous materials handling.