AARST_Radon_Reporter_Q32025_Single

18 | SEPTEMBER 2025 VAPOR INTRUSION The business need for mitigation contractor certification in Wisconsin is discussed in the recently published “Issue Paper: Establishment of a Mitigation Contractor Certification Program” document. It was developed by the Remediation and Redevelopment External Advisory Group (RR EAG) and members of the public. IEA participated in the development of the paper. The paper discusses why a mitigation certification program is being considered to address issues with contractor qualifications and accountability identified in Wisconsin with both radon and vapor intrusion mitigation systems. Once approved, the state’s programwould require that mitigators be certified by NRPP’s national credential for vapor intrusion mitigation. The goal of mitigation contractor certification is to ensure soil gas mitigation systems, designed and installed by qualified personnel according to established industry consensus standards, are protective of the health of occupants and limit potentially harmful exposures. Recommendations will be developed after the NRPP VI mitigation credential has been finalized and reviewed by Wisconsin stakeholders. The WI RR EAG issue paper on mitigation certification is available HERE. The Interstate Technology & Regulatory Council (ITRC) and its Vapor Intrusion Team will soon be releasing several updated resources for the environmental community. The new ITRC Vapor Intrusion (VI) Pathway Evaluation and Mitigation Guidance Document will update, combine and replace ITRC’s three previous VI documents and provide regulators, practitioners and stakeholders with a comprehensive document that includes a summary of current state practices and a “VI 101” Chapter for users who are new to VI issues. While much of the content of this guidance has been pulled forward from previous ITRC Guidance documents, processes and technologies have been updated to reflect current state of practice and available research, and additional resources such as Fact Sheets and Checklists have been created. The new Guidance Document and associated resources are scheduled to be released in January 2026. Several new web-based training courses and educational materials are also being developed to support the document: an update to the popular ITRC Vapor Intrusion Mitigation training series, a new VI 101 course, and two case scenario trainings focused on petroleum and chlorinated compound impacted sites. These courses will launch in 2026. To learn more about ITRC and the Vapor Intrusion Team, visit https://itrcweb.org/vip-update-team/ Coming Soon: New ITRC Vapor Intrusion Guidance and Training News fromWisconsin: Mitigation Contractor Certification Issue Paper