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Vapor Intrusion Investigations and Indoor Air Human Health Risk Assessments

U.S. Environmental Protection Agency, U.S. Army Corps of Engineers, and commercial clients
Location: MULTIPLE LOCATIONS - U.S.

OVERVIEW

• Vapor Intrusion Investigations
• Indoor Air Inhalation
• Johnson and Ettinger Model
• VOCs in Soil Vapor and Groundwater

DESCRIPTION

The vapor intrusion pathway is an exposure pathway that is now commonly encountered at various waste sites. Avatar staff has extensive knowledge and experience in the vapor intrusion exposure pathway. We have remained up-to-date on the evolving technologies.

We have designed and implemented sampling strategies for soil gas and indoor air to support vapor intrusion investigations for various government and private clients. Avatar has comprehensively evaluated the data collected as part of the vapor intrusion investigations to evaluate the exposure associated with the vapor intrusion pathway. Using empirical data, we have conducted a number of analyses ranging from risk-based screening evaluations using soil gas and indoor air data to baseline human health risk assessments of the indoor air at affected buildings. The risk analyses have been conducted in accordance with CERCLA guidance and guidance from various state agencies. In certain situations, empirical indoor air data directly related to the vapor intrusion pathway are not available. Avatar also has experience using the Johnson and Ettinger Model to predict indoor air concentrations from contamination observed in groundwater, soil gas, and soil.

The following list presents a few examples of vapor intrusion evaluations performed by Avatar:

• EPA Region 1 at the Kellogg-Deering and McKin Superfund Sites
• USACE-Lousiville District at a former Nike Missile Site
• Aberdeen Proving Ground's Directorate of Safety, Health, and the Environment at a cluster of sites
• commercial clients in Pennsylvania following PADEP Act 2 Guidance

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Avatar has extensive experience in all facets of the vapor intrusion exposure pathway and health based assessments of indoor air.