IAVI
--
---
 Home
---
 Vapor Intrusion Guidance (VIG) Conference Call
---
 Guidance
---
 Workshops and
 Conferences
---
 Other Documents
---
 Related Links
---
 Contact Info
---
 Login
---
Vapor intrusion is the migration of volatile chemicals from the subsurface into overlying buildings. Volatile chemicals in contaminated soil or groundwater can emit vapors that may migrate through soil and into indoor air spaces.

This website includes general information on vapor intrusion, along with information on some of the efforts being conducted in support of the Environmental Protection Agency’s (EPA’s) developing Vapor Intrusion Guidance.

EPA’s Vapor Intrusion (VI) Database is designed to hold data to support site-specific measurements of vapor attenuation, or the reduction in vapor concentrations as volatile contaminants move from soil and groundwater into indoor air. High-quality, representative, and reproducible measurements of soil gas, groundwater, and indoor air contaminant concentrations from VI sites are needed to measure vapor attenuation, verify that VI model predictions are accurate, improve understanding of the operating physical phenomena of VI, and help EPA, states, and other practitioners evaluate and improve predictive models and screening algorithms for the VI pathway. In March 2008, EPA released an improved and updated version of the EPA VI database that was originally developed in support of the 2002 VI Guidance. Documentation of this update, and how it differs from the 2002 database, can be downloaded here (or by clicking on "Other Documents" on the left of this page). To access the updated data, please login, which will enable you to access the “Database Downloads” section of this website.

This website also includes presentations and supporting materials for several workshops conducted by EPA in support of the developing guidance. These presentations can be accessed by clicking on the “Workshops and Conferences” link on the left of this page.

Disclaimer:  This is a development site for public use and in support of Agency activities. It is not an official US EPA website. It is operated by RTI International, who is under contract to the US EPA for developing and maintaining an indoor air vapor intrusion database, along with other activities to improve EPA's Vapor Intrusion Guidance.
 



RTI International     Strategic Brownfields Solutions    


For more information, please contact:    Robert Truesdale

Web Administrator: Jennifer Lloyd RTI
24/04/2014