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.