How many soil samples should be taken from the bottom of the tank?

The correct answer is that two samples should be taken from the bottom of the tank. This approach is rooted in the need for thorough testing to assess potential contamination levels accurately. By collecting two samples, it allows for a better representation of the area at the base of the tank, where issues such as leaks or spills are most likely to manifest. This method helps to account for variability in soil conditions and contamination, providing a more reliable analysis overall.

In environmental assessments, collecting multiple samples is crucial for accurately determining the extent of contamination. Having two samples from different points can help identify whether there are localized areas of contamination or if it's more widespread. This kind of due diligence is vital for appropriate remediation actions and compliance with local regulations regarding soil testing and environmental protection.