Vapor intrusion into buildings from underground plumes of contamination is a problem at Fort Ord and other contaminated sites. This is a public workshop for students, environmental and public health groups, citizen scientists, and other members of the public, as well as county and state officials, interested in collecting data on toxic exposures.

Vapor Intrusion: The Complete Picture from Fundamentals to Redevelopment – Working Together
Workshop 5: Collecting Quality Data to Support Effective and Efficient Vapor Intrusion Decision Making
The California Environmental Protection Agency (CalEPA) Vapor Intrusion Workgroup (CalEPA VI Workgroup or Workgroup) is pleased to host five virtual public workshops to share and gain input on CalEPA’s efforts to address vapor intrusion at contaminated sites from February through June 2026. The fifth workshop in the series is Vapor Intrusion Data.
The workshop is virtual only with no physical location.
Workshop 5 Attendance Information
Collecting Quality Data to Support Effective and Efficient Vapor Intrusion Decision Making
November 17, 2026 (date subject to change)
9:00am – 2:00pm PST
PDF notice
Via Video and Teleconference Only
No Physical Meeting Location
Workshops will be recorded.
Zoom registration is required.
Zoom Registration Link:
Collecting Quality Data to Support Effective and Efficient Vapor Intrusion Decision Making Registration Link
This workshop will build on the previous workshops in CalEPA’s Vapor Intrusion Workshop Series, providing a deeper dive into collecting quality vapor data to support effective, efficient, and riskbased decision making.
Presentations from CalEPA staff and environmental cleanup professionals
will:
- Emphasize the importance of collecting quality vapor data to support building robust conceptual site models, developing multiple lines of evidence (both quantitative and qualitative), and making risk-based decisions;
- Walk through California’s VI guidance and tackle frequently asked questions;
- Review strategies for vapor data collection and field considerations for effective VI site investigations;
- Dive into data quality review, including data quality objectives, quality assurance and control, and laboratory considerations;
- Discuss the complexities of vapor intrusion and related data analyses;
- Review how vapor data is managed in GeoTracker and EnviroStor; and
- Share CalEPA’s takeaways from feedback received throughout the workshop series.
Attendees will have the opportunity to engage with industry professionals and regulators on current challenges and lessons learned around these topics during the workshop’s question and answer (Q&A) portions.
For any questions, please email the program host at: DWQ-vaporintrusion@waterboards.ca.gov
The California Environmental Protection Agency (CalEPA) Vapor Intrusion Workgroup (CalEPA VI Workgroup or Workgroup) is pleased to host five virtual public workshops to share and gain input on CalEPA’s efforts to address vapor intrusion at contaminated sites from February through November 2026.
2026 Vapor Intrusion Workshop Series:
- Vapor Intrusion Cleanup Case Basics Training – Feb 12, 2026
- Vapor Intrusion in the Community – Feb 25, 2026
- Vapor Intrusion Holistic Approach Part 1: Conceptual Site Model and Best Practices –
March 10, 2026 - Vapor Intrusion Holistic Approach Part 2: Paths to Closure and Risk Management DecisionMaking – May 14, 2026
- Collecting Quality Data to Support Effective and Efficient Vapor Intrusion Decision Making – November 17, 2026 (final date is subject to change)
Background
The CalEPA VI Workgroup is a multi-agency workgroup consisting of DTSC [Department of Toxic Substances Control], the State Water Resources Control Board (State Water Board), multiple Regional Water Quality Control Boards, and the Office of Environmental Health Hazard Assessment (OEHHA) that serves as a technical and regulatory resource for addressing contaminated sites impacted by vapor intrusion across California. The CalEPA VI Workgroup is hosting this 2026 Vapor Intrusion Workshop Series to present and gather feedback on its efforts and approaches to addressing and managing vapor intrusion.




