Soil-Gas and Vapor Intrusion

Representative Projects
Soil-Gas and Vapor Intrusion

In recent years, regulatory agencies across the United States have recognized that the migration of volatile organic compounds in soil gas, and the resultant intrusion of vapors into buildings, can cause significant exposure risk at and near contaminated sites. As a consequence, agencies have increasingly required studies of soil gas and indoor air at such sites, in some cases even re-opening investigations previously thought to be complete. Unfortunately, technical guidance for conducting vapor intrusion (VI) studies is often either in development or completely lacking, causing confusion for both regulators and the regulated community.

TriAD offers expertise in the assessment of soil gas and indoor air that is necessary in determining the VI risk at contaminated sites. Using active and passive sampling technologies, TriAD can collect the data needed to evaluate the potential risk to human health posed by volatile organic compounds migrating upward from contaminated soil or groundwater. Our expertise includes knowledge of the current, uncertain regulatory environment and the ways agencies are approaching the issue. In fact, TriAD professionals are among the first in Tennessee to develop a long-term soil-gas monitoring plan, allowing regulators to incorporate vapor intrusion evaluation into a monitoring-only remedy.

Evaluation of VI potential is also becoming an important aspect of Phase I Environmental Site Assessments. An ASTM Standard Practice has been developed for VI assessment during real-estate transactions, and such assessments may soon become a required part of Phase I ESAs.

Representative Projects

TriAD Environmental Consultants
(615) 889-6888
207 Donelson Pike Ste 200
Nashville, TN 37214