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The podcast "Screening Vapour Intrusion Risks at Underground Storage Tank Sites" is now available for everyone. Click here>>>>>

In this podcast, Dr Matthew Lahvis, Shell Global Solutions (US) presents the latest developments in scientific understanding on petroleum vapour intrusion (PVI).  He includes updates on the understanding of the PVI conceptual site model, the importance of understanding the role atmospheric oxygen plays in the unsaturated zone and explain the development of vertical screening distances for dissolved phase hydrocarbon plumes in groundwater. These recent developments have been led by the US Interstate Technology Regulatory Council (ITRC) and implemented by the USEPA to support improved decision making at petroleum release sites. Knowledge of this latest research can help regulators and decision makers to confidently screen out sites (based on there being no PVI risk), therefore focusing limited resources on the small fraction of petroleum-contaminated sites that warrant vapour control or additional site management.