NR 700 Overview of Vapor Intrusion Vapor intrusion generally refers to subsurface contamination that can volatilize and the vapors enter the breathing space of buildings. One of the ways to mitigate vapor intrusion into buildings is to remediate the underlying sources of contaminants in soil or groundwater. ITRC has developed a series of fact sheets that summarizes the latest science, engineering, and technologies regarding vapor intrusion (VI) mitigation. 292; Wis. Admin. The foundation type determines whether we recommend a sub-slab depressurization system or a sub-membrane depressurization system, which may be supplemented by other vapor mitigation techniques. Mitigation of vapor intrusion is necessary for as long as there is a health risk to building occupants. The document also provides information on selecting appropriate technologies in consultation with qualified engineering and risk management professionals. These sub slab depressurization systems are similar in some cases to radon mitigation systems. Code ch. Remediation of vapor intrusion issues take a considerable amount of evaluation of the source and migration routes of vapors, i.e., how the vapors are entering the building environment. Remediation; Vapor Intrusion; Vapor Intrusion. The most common method used in Vapor Intrusion Mitigation is Sub Slab Depressurization, similar to the method used in radon mitigation . The concept is to create a vacuum under the slab and draw the gas into the system where it can be discharged to a safe location. Mitigation of vapor intrusion comprises the many approaches to lessen the severity of of vapor entry into buildings. For example, properties such as gas stations, dry cleaners, or businesses operating metal parts degreasers use chemicals like gasoline or solvents that can cause vapor intrusion. According to the US Environmental Protection Agency (EPA), vapor intrusion occurs when vapor-forming chemicals migrate from a subsurface source into an overlying building. Addressing Vapor Intrusion at Remediation & Redevelopment Sites in Wisconsin Wis. Stat. Typically a VI investigation is triggered due to a known contaminant below ground that has the potential for vapors to migrate into a building interior. Vapor intrusion assessments form the starting point for architecting and installing a vapor mitigation system to retrofit an existing building. Oftentimes, mitigation is employed as an interim measure until soil and groundwater remediation is complete, which can take months to years. ch. Active Vapor Intrusion Mitigation Systems – Fans and pumps can be strategically placed to raise or lower air pressure to direct impacted indoor air out of the building. However, this can take considerable time, so other mitigation methods to prevent human exposure may be needed. 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