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Petroleum Vapor Intrusion: Fundamentals of Screening, Investigation, and Management


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August 4, 2016 by John Nicholson

The U.S. Interstate Technology and Regulatory Council (ITRC), an organization focused on advancing environmental solutions, is hosting a webinar on petroleum vapour intrusion.  The webinar is schedule for August 30, 2016 from 1:00PM-3:15PM EDT (17:00-19:15 GMT).

Chemical contaminants in soil and groundwater can volatilize into soil gas and migrate through unsaturated soils of the vadose zone.  Vapor intrusion (VI) occurs when these vapors migrate upward into overlying buildings through cracks and gaps in the building floors, foundations, and utility conduits, and contaminate indoor air.  If present at sufficiently high concentrations, these vapors may present a threat to the health and safety of building occupants.

Petroleum vapor intrusion (PVI) is a subset of VI and is the process by which volatile petroleum hydrocarbons (PHCs) released as vapors from light non-aqueous phase liquids (LNAPL), petroleum-contaminated soils, or petroleum-contaminated groundwater migrate through the vadose zone and into overlying buildings.

The ITRC Technical and Regulatory Guidance Web-Based Document, Petroleum Vapor Intrusion: Fundamentals of Screening, Investigation, and Management (PVI-1, 2014) and this associated Internet-based training provides regulators and practitioners with consensus information based on empirical data and recent research to support PVI decision making under different regulatory frameworks.

The PVI assessment strategy described in this guidance document enables confident decision making that protects human health for various types of petroleum sites and multiple PHC compounds.  This guidance provides a comprehensive methodology for screening, investigating, and managing potential PVI sites and is intended to promote the efficient use of resources and increase confidence in decision making when evaluating the potential for vapor intrusion at petroleum-contaminated sites.

By using the ITRC guidance document, the vapor intrusion pathway can be eliminated from further investigation at many sites where soil or groundwater is contaminated with petroleum hydrocarbons or where LNAPL is present.

For more information and to register, see https://clu-in.org/conf/itrc/PVI/.


John Nicholson

John Nicholson

John is a cleantech and environmental expert with over 25 years of experience. He is a registered professional engineer and has a Masters degree in environmental engineering.
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