(3) Calculation of SLs/TLs and CR/HQs for pollutants. The HERA model can be
used to calculate SLs/TLs and CR/HQs for exposure to soil and groundwater
pollutants in a single pathway, as well as SLs/TLs based on protecting human
health and water environment, and CR/HQs based on human health protection.
In addition, the contribution rate of a single exposure pathway in forward and
reverse modes can be calculated separately. In the forward mode, the concentrations of pollutants in environmental media such as crops, indoor and
outdoor air, groundwater, soil particles, soil gas, and soil solution can be
predicted.
Fig. 4.2 Conceptual model for site assessment
Fig. 4.3 Interface for exposure pathway selection
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4 Risk Assessment of Groundwater Contamination Sites
used to calculate SLs/TLs and CR/HQs for exposure to soil and groundwater
pollutants in a single pathway, as well as SLs/TLs based on protecting human
health and water environment, and CR/HQs based on human health protection.
In addition, the contribution rate of a single exposure pathway in forward and
reverse modes can be calculated separately. In the forward mode, the concentrations of pollutants in environmental media such as crops, indoor and
outdoor air, groundwater, soil particles, soil gas, and soil solution can be
predicted.
Fig. 4.2 Conceptual model for site assessment
Fig. 4.3 Interface for exposure pathway selection
78
4 Risk Assessment of Groundwater Contamination Sites