When is PAH analysis required on representative water samples?

The requirement for PAH analysis on representative water samples is linked to the levels of Total Petroleum Hydrocarbons (TPH) and Benzene, Toluene, Ethylbenzene, and Xylene (BTEX). In this context, when TPH and BTEX exceed the Risk-Based Concentrations (RBCs), it indicates a significant potential contamination risk that necessitates further investigation.

The PAH (Polycyclic Aromatic Hydrocarbons) analysis is crucial in such scenarios because high TPH levels often correlate with various harmful compounds, including PAHs, which can pose serious health and environmental risks. Conducting a PAH analysis allows for a comprehensive understanding of the contamination and aids in determining the necessary remedial actions to protect public health and the environment.

Therefore, performing PAH analysis provides critical insight into the nature of the contamination and informs the decision-making process regarding further assessments or remedial actions when TPH and BTEX levels exceed RBCs.