When obvious contamination is observed, what action must be taken regarding soil samples?

When obvious contamination is observed, the correct action is to sample from the worst contaminated areas. This approach is essential for accurately assessing the extent of the contamination. By focusing on the areas that show the most severe signs of contamination, an environmental assessment can be conducted that reflects the true scope of the problem.

Collecting soil samples from the most affected locations allows for a comprehensive understanding of the contaminants' movement and concentration. It helps inform appropriate remediation strategies and ensures that the response to the contamination is both effective and efficient. This method prioritizes the health of the environment and nearby communities by addressing the highest risks associated with the contamination first.

In contrast, sampling only from the tank may not provide a complete picture, as it misses the broader contaminated areas. Ignoring visual observations or only sampling from predetermined locations disregards real-time evidence of contamination and can lead to inadequate efforts in addressing the issue at hand.