Phase lb risk assessment

Figure 2 Flow diagram for Phase lb risk assessment...

The precise nature of the contaminant on the site may be important to the risk estimation. For example, the Phase lb risk assessment may have confirmed the presence of polychlorinated biphenyls (PCBs) that could reach humans. However, there is a large variation in the toxicology of individual PCB congeners and so congener-specific measurement is required for risk estimation. Total metal concentrations are sufficient to confirm the presence of a source but metal speciation may influence solubility and so the risk posed to groundwater. The choice of chemical analysis for source characterisation should be informed by... 

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