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September 2012
Vapor Intrusion Newsletter
In This Issue:

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AWMA Vapor Intrusion Conference in Denver

The sixth Air & Waste Management Association (AWMA) Vapor Intrusion Conference is to be held in Denver, Colorado on October 3-4, 2012. Information is available at:

28th Annual International Conference on Soils, Sediments, Water, and Energy

AEHS and the University of Massachusetts-Amherst are holding the 28th Annual Conference on Soils, Sediments, Water, and Energy on October 15-18. The conference includes two sessions and two workshops on vapor intrusion. Information can be found at:

Montana DEQ Issues Background Indoor Air Report

In August 2012, the Montana DEQ released a report entitled "Typical Indoor Air Concentrations of Volatile Organic Compounds in Non-Smoking Montana Residences Not Impacted by Vapor Intrusion". The study included 50 residences in urban and rural settings with indoor air analyzed for TO-15 VOCs and Massachusetts Air-Phase Petroleum Hydrocarbons. The document is available on the DEQ VI Guidance website at:

Final EPA Vapor Intrusion Guidance to be issued by November

EPA is planning to issue final Subsurface Vapor Intrusion Guidance by November 30, 2012. A request for public input was announced in the Federal Register and the comment period ended on May 14, 2011. All comments that were received will be considered in the development of the final guidance. The comments received can be found at:

California Water Board issues Low Threat Closure Policy

The California Water Resources Control Board recently issued a new Low-Threat Underground Storage Tank Case Closure Policy. The policy specifies general criteria that must be met and media-specific criteria, including four potential vapor intrusion scenarios with varying exclusion distances. The policy can be found at:

Risk Group Agrees to Industry Request to Review EPA's New TCE Policies

An Inside EPA article, posted August 17, 2012, indicates that the Alliance for Risk Assessment has agreed to a request from the Alliance for Site Closure to convene a panel of experts to address concerns related to EPA's new risk assessment for TCE and agency efforts to apply the new risk values at waste sites. Of particular concern for the site closure group are the non-cancer risk values EPA set in its recently finalized Integrated Risk Information System (IRIS) assessment for TCE, as well as its decision to list cardiac birth defects as a potential adverse endpoint from TCE exposure. The full text of this article is available, courtesy of InsideEPA.com, at:

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This newsletter is issued periodically to provide our readers with information on new regulatory and technical developments in the rapidly changing field of vapor intrusion. While every effort is made to ensure that the information and links presented in this newsletter are accurate at the time of publication, they are presented for general information purposes only. Users should independently verify the accuracy and applicability of this information and seek professional advice for any specific sites or purposes. Articles on or links to any document or website do not imply endorsement of that document or website by EnviroGroup. Copyright EnviroGroup Limited 2006. 7009 S. Potomac Street, Centennial, CO 80112.
Please contact us if you have any questions about the topics presented in this newsletter, or vapor intrusion in general. More information about EnviroGroup Limited, including several useful links to vapor intrusion websites, is available at: http://www.envirogroup.com/vaporintrusion.php