What is the minimum number of confirmation samples needed in areas where contamination was observed?

In areas where contamination has been observed, collecting a minimum of two confirmation samples is necessary to ensure that the data obtained is reliable and representative of the extent of contamination. Using two samples allows for a better assessment of the contamination levels and can help identify any spatial variability in the site. By comparing results from both samples, you gain confidence in the findings and can make more informed decisions regarding remediation actions or further investigation.

The sampling process must be designed to ensure that you are not drawing conclusions from a single point measurement, which may not accurately reflect the true nature of the contamination. Multiple samples help establish a pattern or trend in contamination levels and contribute to a more robust understanding of the environmental impact.