SAME Environmental COI Webinar: Identifying and Solving Vapor Intrusion Problems at Military Sites-- State of the Practice

Vapor intrusion (VI) is a common exposure pathway to be considered when redeveloping, building, or renovating buildings on land that includes active and closed military bases. The speakers will briefly recap the VI hazard posed to occupants of buildings that overly volatile chemical-release sites, and the current state of the industry for assessing and mitigating this hazard. The presentation will first focus on scenarios for assessment, and matching investigation strategies to the scenarios to achieve protective and compliant results, followed by a brief review of mitigation approaches. The webinar will then present an investigation and mitigation Case Study for an industrial building converted to residential use. Mitigation required a design to tackle crawlspaces, slab-on-grade construction, wooden floors, and a basement with dirt, rubble, and concrete floors. The Case Study will cover strategies used to assess VI risk; results from VI assessments; pilot studies (e.g., pressure-field extension tests); design aspects for the VI mitigation system (VIMS) selected for the crawlspaces, basement, and first-floor areas; VIMS performance verification data; results from pre-occupancy testing; and construction challenges & lessons learned.