What must groundwater samples always be analyzed for?

Groundwater samples should always be analyzed for BTEX (Benzene, Toluene, Ethylbenzene, and Xylene) and PAH (Polycyclic Aromatic Hydrocarbons) because these compounds are key indicators of petroleum contamination, which can occur from leaks in heating oil tanks. BTEX compounds are commonly found in petroleum products and are known to pose significant health risks if they contaminate drinking water sources. PAHs, on the other hand, can result from incomplete combustion of organic materials, and their presence in groundwater can indicate environmental contamination.

The importance of these analyses lies in identifying potential threats to human health and the environment, as both BTEX and PAH compounds are known to be toxic and can have long-term ecological effects. Monitoring for these substances helps in assessing the quality of groundwater and ensuring compliance with environmental regulations. Therefore, the analysis for BTEX and PAH is critical for effective groundwater management and remediation strategies.