This highlights the complexity of the process. A single sample cannot determine whether an area is safe or not. When we detect a high level of contamination, we have some degree of certainty in terms of the risk level. However, for an area that hasn't been tested or has been closed for a long time because of testing, it may take up to two years of sampling before we can be certain that the area has a consistent, safe pattern for reclassification and opening.
