As part of its ongoing leadership, the California EPA (CalEPA) Vapor Intrusion (VI) Workgroup is rolling out a series of technical workshops aimed at presenting best practices in site assessment and long-term management of contaminated sites potentially impacted by VI. Recordings from the first three workshops are available now and Workshops 4 & 5 are scheduled for May and June 2026.
The most recent session, Workshop #3: “Vapor Intrusion Holistic Approach Part 1:Conceptual Site Model (CSM) and Best Practices” highlights a clear and growing preference for passive soil gas samplers as a high-resolution site characterization tool. A featured case study, presented by Jay Jones from Environmental Navigation Services, Inc., reinforces how Beacon Passive Samplers were critical in building a robust CSM that accurately guided site characterization and targeted remediation strategies by collecting amore spatially dense dataset.
The workshop also highlights the expanding role of passive samplers in indoor air sampling and long-term site stewardship monitoring where consistent, defensible data over extended durations is critical. Collecting time-integrated data that normalizes the known temporal variability existing in VOC vapor concentrations leads to more reliable VI risk evaluation and successful long-term site management.
The takeaway: an incomplete CSM is a liability – high-resolution, time-integrated data is key to reducing uncertainty and minimizing data gaps.
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