Note: The ITRC Vapor Intrusion Toolkit (VI Toolkit) published in January 2026 updates the information in this original guidance document. This document has not been amended since publication. Some content may be out of date and may no longer apply. For the most recent information, please visit the ITRC VI Toolkit at https://itrcweb.org/vapor-intrusion-toolkit/.
Vapor Intrusion Pathway: A Practical Guideline (VI-1) is a practical, user-friendly resource that provides step-by-step guidance for assessing the vapor intrusion pathway. Additional supporting information is included in the appendices and in the companion document, Vapor Intrusion Pathway: Investigative Approaches for Typical Scenarios (VI-1A), which offers practitioners further assistance and investigative approaches for applying the guideline in common scenarios.
Topic(s): Vapor Intrusion
