In a regulatory phase of site investigation, which statement best describes its purpose?

• A. The final remedy is selected
• B. The site is demolished
• C. Groundwater is never sampled
• D. The nature and extent of contamination is determined

Answer: (D)

The main idea is to identify what contaminants are present, where they are, and how far they have spread. In regulatory phases of site investigation, collecting data on contaminant types, concentrations, and their distribution across soils, groundwater, and other media establishes the extent and boundaries of contamination. This information is essential for risk assessment and for planning appropriate regulatory actions and cleanup strategies. The final remedy is not decided at this stage; that comes after understanding the contamination and its risks. Demolishing the site isn’t the purpose of this phase, and groundwater sampling is typically a key part of delineating the contamination rather than being omitted.