Vapor Intrusion (VI) refers to the migration of volatile chemicals from subsurface contaminated soils and groundwater into the indoor spaces of overlying buildings through openings in the building foundation, or via pathways such as underground utilities. The presence of such chemicals can impact indoor air quality and create a hazard for occupants.
As the vapors migrate, contaminate concentrations decrease. This happens as a result of natural processes in soil such as diffusion, advection, and sorption. The vapors also become diluted when mixed with indoor air. The level of concentration of vapors in the indoor air can be measured and monitored to determine air quality.
FEA personnel have conducted numerous VI assessments and investigations. You can rely on us to accurately determine if VI is a real concern at your site.