What is the primary function of a geophysical survey in Environmental Site Assessments?

The primary function of a geophysical survey in Environmental Site Assessments is to help locate the source of contamination and identify subsurface conditions. Geophysical methods involve using various technologies to measure physical properties of the earth, such as density, magnetic fields, and electrical conductivity. This data provides valuable insights into the subsurface environment, which is crucial for identifying potential contamination sources, mapping the extent of contamination, and determining the geological and hydrogeological conditions that may affect the migration of pollutants.

By utilizing geophysical surveys, professionals can non-invasively assess the site, which aids in decision-making for remediation strategies and overall site management. This information is vital for understanding how contaminants may have affected the site and what actions might be necessary to ensure its safety and compliance with regulatory standards.

The other options do not align with the primary objectives of a geophysical survey within the context of Environmental Site Assessments. Gathering data on flora and fauna pertains to biological assessments, estimating property value relates to real estate evaluations, and analyzing natural disaster hazards focuses on risks unrelated to contamination or subsurface conditions.