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Figure 5 | Environmental Health

Figure 5

From: Cancer risk to First Nations’ people from exposure to polycyclic aromatic hydrocarbons near in-situ bitumen extraction in Cold Lake, Alberta

Figure 5

Calculated excess life time cancer risk as a function of soil PAH concentration (expressed as BaP equivalents) for different soil ingestion rates. Assumed exposure frequency of 153 days per year. The solid grey line denotes an excess lifetime risk of 1 extra cancer case per 100,000 people. This 1E-05 risk occurs at a BaP concentration of 724 ng g-1, 7066 ng g-1, and 13072 ng g-1 for soil ingestion rates of 361 mg d-1, 37 mg d-1, and 20 mg d-1, respectively. The solid black vertical line denotes the maximum BaP equivalent concentration. Two of the chosen soil ingestion rates are the 95th percentile (361 mg d-1) and median rates (37 mg d-1) from the Cold Lake soil ingestion study. The third value (i.e., 20 mg d-1) is the ingestion rate recommended by Health Canada for adult HHRA of contaminated sites.

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