Written by Stephen Henshaw, P.G., President and CEO, EnviroForensics
As seen in the March 2010 issue Western Cleaner and Launderer.
Vapor Intrusion, or VI, is probably the hottest topic among regulators these days. Vapor intrusion may be best described as the contamination of indoor breathing air as a result of being in proximity to soil or groundwater releases of hazardous chemicals. Generally speaking, volatile organic compounds that have been released or spilled into the subsurface display a preference to evaporate into air spaces, or voids, in the soils. These vapors can then disperse and travel through the soils to nearby buildings. Contaminated soil vapors are most likely to travel along utility corridors where backfill material, such as sand, typically has more air spaces than the surrounding soils that were laid down naturally by Mother Nature. Once the vapors travel through a utility corridor, they may migrate into the building through concrete block basement walls, floor drains, drainage sumps or cracks in the floor. Continue reading “Vapor Intrusion and Indoor Air Sampling Expensive Testing – Make Sure It’s Done Correctly”