Which of the following statements about loading and unloading cargo tanks is false?

The statement that the person in attendance must be within 50 ft of the tanker is false because there aren't specific regulations mandating a 50-foot proximity to the tanker during loading and unloading operations. Instead, the requirements emphasize that the person must be in attendance and in a position to respond quickly to any emergencies or incidents that may arise during the operation. This can vary based on the specific type of tanker and the circumstances of the loading or unloading process.

In contrast, the correct practices include wearing a safety vest for visibility and safety purposes, ensuring the tank is properly grounded to prevent static discharge during the transfer of flammable or hazardous materials, and providing adequate ventilation to mitigate the accumulation of vapors, thereby ensuring a safer environment for personnel involved in the operation. Each of these practices aligns with established safety protocols aimed at protecting workers and preventing accidents during hazardous material handling.