EPA Releases New Resources for Vapor Intrusion Assessment, Mitigation

Published June 17, 2015
Two new technical documents from EPA provide recommendations for identifying, evaluating, and managing vapor intrusion, and describe technical approaches for site-specific conditions and circumstances. The new documents supersede and replace EPA’s Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils, which was released in 2002.

The Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway from Subsurface Vapor Sources to Indoor Air applies to sites being evaluated under federal land cleanup statutes by EPA, other federal agencies, state and tribal governments and brownfield grantees. The Technical Guide for Addressing Petroleum Vapor Intrusion at Leaking Underground Storage Tank Sites addresses sites where vapor intrusion related to petroleum contamination from underground storage tanks is a potential concern.

“These guides will promote national consistency in assessing and addressing the vapor intrusion human exposure pathway at contaminated sites to protect human health -- particularly the most vulnerable,” said Mathy Stanislaus, assistant administrator for EPA’s Office of Solid Waste and Emergency Response.

Both guides are applicable to residential and non-residential settings.

According to an agency press release, the hazards presented by vapor intrusion can typically be prevented or reduced through relatively inexpensive actions such as changing building pressure and ventilation.