Development of a Human Health Risk Assessment Tool for Sustainable Decision-Making at Crude-Oil-Contaminated Sites in the Energy Sector

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Abstract
Numerous studies have examined the contribution of polycyclic aromatic hydrocarbons (PAHs) to soil contamination, resulting from legacy oil extraction and storage activities in the energy sector, and the human health risks. In this research, a human health risk assessment (HHRA) was performed on a site contaminated with crude oil, incorporating spatial analysis to identify hotspots of carcinogenic and non-carcinogenic risk from PAH-contaminated soil. In total, eight soil sampling locations were considered. The HHRA was conducted using a software tool developed by the National University of Science and Technology POLIETHNICA of Bucharest according to the United States Environmental Protection Agency (US EPA) and American Society for Testing and Materials (ASTM International) standards. The results obtained in the current assessment were validated against the Risk-net software 3.2 (an Italian tool for risk assessment validated by the ISPRA). The assessment considered a residential scenario (adult and child receptors) using four different exposure pathways: soil ingestion, dermal contact, vapor inhalation (due to the volatilization process) and groundwater ingestion (because of the leaching process). The carcinogenic risk (CR = 1 × 10−5) and total hazard index (THI < 1) in the studied area were above the threshold values for both adults’ and children’s receptors. The highest concern is given to the process of PAHs leaching from soil to groundwater. The highest carcinogenic concern is benzo(a)pyrene for children’s exposure via groundwater ingestion (CR = 3.53 × 10−5), while the highest toxic effect is registered for the contaminant naphthalene (THI = 6.22) for the same receptor and exposure pathway.

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