The Vapor Intrusion 101 training series provides an overview of vapor intrusion (VI) and presents information from the 2026 ITRC VI Toolkit (which includes fact sheets, technology information sheets, and checklists). This course introduces participants to the fundamentals of vapor intrusion, the process by which vapor-forming chemicals in contaminated soil or groundwater volatilize and migrate into buildings. The course will discuss sources, pathways, and receptors. It will identify and assess VI risks in various settings (residential, commercial, industrial) and familiarize participants with regulatory frameworks and guidelines (e.g., USEPA, state-specific regulations). The participants will gain working knowledge of how to develop a Conceptual Site Model (CSM), design and implement sampling strategies, establish data quality objectives (DQOs), and conduct data and risk evaluations. It will provide an overview of mitigation strategies, including various closure strategies, land use covenants, and institutional controls. Session 1 will focus on:What is Vapor IntrusionVI Exposure PathwayVI in Practice - including common CSMs, Scenarios, and ChemicalsPotential Limiting Factors for VI - PVI vs Chlorinated VI, Geology, Hydrogeology, and Building Operating ConditionsHow is VI Different & Challenges in Evaluating VI Session 2 will focus on:How VI is DifferentHow to assess VI - CSM, Sample Collection, Data Interpretation, Risk Assessment, and Project Life CycleManaging VI Risk at a Site - Mitigation, Remediation, MonitoringWhat does Closure look like & Various Exit Strategies The course will provide connections to the 2026 ITRC VI Toolkit to help the audience understand how to find and use these new resources for VI sites. To view this archive online or download the slides associated with this seminar, please visit http://clu-in.org/conf/itrc/VI-introductory_090826/

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“What did the council decide on item 42?” — answered with the speaker and the moment.

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