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Quarterly Journal of Engineering Geology and Hydrogeology

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Presentation on theme: "Quarterly Journal of Engineering Geology and Hydrogeology"— Presentation transcript:

1 Quarterly Journal of Engineering Geology and Hydrogeology
Vertical screening distances for total petroleum hydrocarbon for vapour intrusion risk assessment at petroleum underground storage tank sites by Matthew A. Lahvis Quarterly Journal of Engineering Geology and Hydrogeology Volume 51(1):3-12 February 15, 2018 © 2018 Shell Global Solutions International BV

2 Regulatory Generic (Tier I) soil-gas RBSL used for TPH vapour intrusion risk assessment in the US.
Matthew A. Lahvis Quarterly Journal of Engineering Geology and Hydrogeology 2018;51:3-12 © 2018 Shell Global Solutions International BV

3 Plot of (a) C5–C8 aliphatic, (b) C9–C12 aliphatic, (c) C9–C10 aromatic, (d) n-hexane, (e) naphthalene and (f) TPH (Total Petroleum Hydrocarbon) concentrations in soil gas v. distance above a LNAPL hydrocarbon source. Plot of (a) C5–C8 aliphatic, (b) C9–C12 aliphatic, (c) C9–C10 aromatic, (d) n-hexane, (e) naphthalene and (f) TPH (Total Petroleum Hydrocarbon) concentrations in soil gas v. distance above a LNAPL hydrocarbon source. Non-detect values are plotted at the reporting limit. Matthew A. Lahvis Quarterly Journal of Engineering Geology and Hydrogeology 2018;51:3-12 © 2018 Shell Global Solutions International BV

4 Probability of (a) C5–C8 aliphatics, (b) C9–C12 aliphatics, (c) C9–C10 aromatics, (d) n-hexane, (e) naphthalene and (f) TPH (Total Petroleum Hydrocarbon) concentrations in soil gas ≤minimum, median and maximum soil-gas RBSLs (risk-based screening levels) at specified vertical distances above a LNAPL source, for the soil-gas data reported in Figure 1. Probability of (a) C5–C8 aliphatics, (b) C9–C12 aliphatics, (c) C9–C10 aromatics, (d) n-hexane, (e) naphthalene and (f) TPH (Total Petroleum Hydrocarbon) concentrations in soil gas ≤minimum, median and maximum soil-gas RBSLs (risk-based screening levels) at specified vertical distances above a LNAPL source, for the soil-gas data reported in Figure 1. Matthew A. Lahvis Quarterly Journal of Engineering Geology and Hydrogeology 2018;51:3-12 © 2018 Shell Global Solutions International BV

5 Kaplan–Meier conditional probability statistics for soil-gas concentration data as a function of distance above a LNAPL hydrocarbon source. Kaplan–Meier conditional probability statistics for soil-gas concentration data as a function of distance above a LNAPL hydrocarbon source Matthew A. Lahvis Quarterly Journal of Engineering Geology and Hydrogeology 2018;51:3-12 © 2018 Shell Global Solutions International BV

6 Plots of detectable (a) C5–C8 aliphatic, (b) C9–C12 aliphatic, (c) C9–C10 aromatic, (d) n-hexane, (e) naphthalene, and (f) total (bulk) TPH (Total Petroleum Hydrocarbon) v. benzene concentrations in soil gas. Plots of detectable (a) C5–C8 aliphatic, (b) C9–C12 aliphatic, (c) C9–C10 aromatic, (d) n-hexane, (e) naphthalene, and (f) total (bulk) TPH (Total Petroleum Hydrocarbon) v. benzene concentrations in soil gas. Matthew A. Lahvis Quarterly Journal of Engineering Geology and Hydrogeology 2018;51:3-12 © 2018 Shell Global Solutions International BV

7 Plots of n-hexane concentrations in soil gas v
Plots of n-hexane concentrations in soil gas v. distance above a LNAPL source for data collected in (a) the US and (b) Australia. Plots of n-hexane concentrations in soil gas v. distance above a LNAPL source for data collected in (a) the US and (b) Australia. Non-detect values are plotted at the reporting limit. Matthew A. Lahvis Quarterly Journal of Engineering Geology and Hydrogeology 2018;51:3-12 © 2018 Shell Global Solutions International BV

8 Probability n-hexane concentrations in soil gas are ≤minimum, median and maximum soil-gas RBSLs (risk-based screening levels) at specified vertical distances above a LNAPL source, for (a) the US and (b) Australia soil-gas data reported in Figure 4. Probability n-hexane concentrations in soil gas are ≤minimum, median and maximum soil-gas RBSLs (risk-based screening levels) at specified vertical distances above a LNAPL source, for (a) the US and (b) Australia soil-gas data reported in Figure 4. Matthew A. Lahvis Quarterly Journal of Engineering Geology and Hydrogeology 2018;51:3-12 © 2018 Shell Global Solutions International BV

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