The U.S. Environmental Protection Agency (EPA) has released two technical guides to support assessment and mitigation activities at sites where vapor intrusion is an actual or potential concern.
The Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway from Subsurface Vapor Sources to Indoor Air applies to all sites being evaluated under federal land cleanup statutes by EPA, other federal agencies, state and tribal governments and brownfield grantees. A companion document, the Technical Guide for Addressing Petroleum Vapor Intrusion at Leaking Underground Storage Tank Sites addresses any sites where vapor intrusion related to petroleum contamination from underground storage tanks is a potential concern. Both guides are applicable to residential and non-residential settings.
According to Mathy Stanislaus, assistant administrator for the agency’s Office of Solid Waste and Emergency Response, 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. He says that States, tribes and localities, in particular, will find the guides to be critical resources for identifying and considering key factors related to vapor intrusion assessments, risk management decisions and mitigation actions.