For HOT cleanup, what must contaminated soil be kept within?

The correct choice underscores the importance of environmental safety and contamination control during a heating oil tank (HOT) cleanup operation. Contaminated soil must be kept within a secure area and adequately covered to prevent the spread of pollutants, protect public health, and minimize environmental impact. A secure area ensures that unauthorized access is restricted, reducing the risk of accidental exposure to hazardous materials. Covering the soil prevents rainwater or wind from spreading contaminants, helping to maintain a controlled and safe cleanup environment.

This approach aligns with best practices in managing hazardous waste, emphasizing the need for thorough management of contaminated materials to safeguard both human health and the environment. Such measures are essential in compliance with regulations and standards that govern hazardous substance management, ensuring that the cleanup process does not inadvertently expose the community or ecosystem to additional risks.