Radon-Reporter-2026-Issue-1FINAL

THE RADON REPORTER | 15 Symposium Speaker Spotlight: Jennifer Borski Wisconsin’s Updated Vapor Intrusion Guidance and Its Updated Mitigation Appendix The Indoor Environments 2026 Radon and Vapor Intrusion Symposium is proud to feature Jennifer Borski , Vapor Intrusion Team Leader / Hydrogeologist for the WI Remediation & Redevelopment Program / Environmental Management Division, who will present one of the most timely state-level updates in the vapor intrusion field: the Wisconsin Department of Natural Resources (WDNR) Vapor Intrusion Guidance, updated in January 2026. This revision reflects Wisconsin’s ongoing effort to modernize its vapor intrusion framework and provide clearer expectations for practitioners working at sites where subsurface vapors may pose a risk. A central focus of Borski’s presentation will be the guidance’s updated mitigation appendix , which offers detailed requirements and recommendations for implementing mitigation at vapor intrusion sites in Wisconsin. The appendix includes updates on system design, installation, commissioning, documentation, and long-term stewardship/operation, maintenance, and monitoring (OM&M) . These additions strengthen the guidance by clarifying what constitutes a complete and defensible mitigation approach, from the initial engineering considerations to the long-term responsibilities that ensure continued protectiveness. Borski will walk attendees through how WDNR’s update aligns with current science and field practice, and how the mitigation appendix supports more consistent decision-making across consultants, responsible parties, and regulatory reviewers. Her session will also highlight how the updated guidance improves clarity around system performance verification and long-term management, areas of growing emphasis nationwide as states refine their vapor intrusion programs. As part of the Symposium’s Vapor Intrusion Track , sponsoredby Barnes&Thornburg , Borski’s presentation offers an important look at how one state is advancing its approach to vapor intrusion mitigation. With participation from EPA and state regulators , attendees will gain valuable insight into how Wisconsin’s updated guidance fits into the broader national landscape and what it means for practitioners working on mitigation projects today.