How is the extent of a release characterized during site assessments?

Characterizing the extent of a release during site assessments is a critical step in understanding potential contamination and its impact on the environment. Collecting soil and groundwater samples is essential because it provides quantitative data about the presence and concentration of contaminants. This approach allows professionals to assess not only if a release has occurred but also the breadth and depth of contamination in both soil and groundwater.

Soil samples can reveal the extent of contamination at different depths, while groundwater sampling helps determine how far pollutants could have migrated through the soil and into aquifers. Together, these analyses provide a comprehensive picture of the contamination situation, allowing for informed decisions about remediation strategies and regulatory compliance.

Visual inspection, while useful for initial assessments, is not sufficient on its own, as it may not reveal concealed contamination that could be present below the surface or in water sources. Similarly, relying solely on water testing would overlook potential issues in the soil that might be contributing to groundwater contamination. Lastly, using local regulations, while important for compliance, does not provide the necessary scientific data needed to characterize the extent of a release accurately. Therefore, collecting both soil and groundwater samples is central to effective site assessments.