Vapor Intrusion Assessments: Can You Trust Your Indoor Air Data?

Written by Jeff Carnahan, L.P.G, Senior Project Manager, EnviroForensics in collaboration with Stephen Henshaw, P.G., President & CEO, EnviroForensics.

As seen in the February 2012 issue of Cleaner & Launderer

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If you’ve ever had to hire an environmental consultant to investigate your property and collect samples, you’ve probably had to look at an analytical report from a laboratory and use it to answer some pretty important questions.  Is there contamination on my property? What chemicals are present? How much is there?  Most importantly, are the levels of contamination high enough to be causing harmful health effects? Only slightly less importantly, are they high enough to require a costly cleanup?  You needed to know the answers to all of these questions so that you could sell or buy a property, get a business loan, or maybe just to sleep at night.  With today’s trend of highly regulated vapor intrusion (VI) assessments being required at sites where dry cleaning with perchloroethene (PCE) has taken place, these questions have become increasingly important and more difficult to answer.

While there are challenges associated with environmental assessments of all kinds; determining the level of hazardous constituents in a building’s indoor air, assessing from where it may have come and evaluating if an unacceptable health risk exists for human occupants can be particularly delicate.  For those property owners who need answers to the questions posed in the situation above, it is extremely important that samples of indoor air collected during VI assessments are representative of the air actually being breathed by the building’s occupants and that the laboratory results can be relied upon.  Continue reading “Vapor Intrusion Assessments: Can You Trust Your Indoor Air Data?”