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Vapor Intrusion Newsletter
October 2013
Vapor Intrusion Newsletter
In This Issue:

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Helen Dawson joins Geosyntec

Helen Dawson, Ph.D, has recently joined Geosyntec's Vapor Intrusion Practice as a Senior Consultant, to provide specialized consulting services in regulatory analysis and negotiation, litigation support, and forensic evaluation of complex environmental systems. Helen is a recognized leader in vapor intrusion. She was the primary author of the U.S. EPA's Office of Solid Waste Emergency Response (OSWER) Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils in 2002. She also was the primary investigator and author on two key technical documents that support vapor intrusion assessment: one on background indoor air concentrations in residences and another on the subsurface-to-indoor air attenuation at vapor intrusion sites. For more information, please visit:

New York Department of Health Lowers Air Guideline Value for PCE

In September the NYSDOH reduced the Air Guideline Value for PCE from 100 micrograms per cubic meter to 30 ug/m3 based on new toxicity data and the USEPA's risk assessment. Information can be found at:

Alliance for Risk Assessment hosts Webinar on TCE Nov. 4

The Alliance for Risk Assessment (ARA) - a coalition of environmental consultants, industry representatives, and regulatory observers - has developed a recommended range to consider when evaluating noncancer risks from TCE inhalation exposures (http://www.allianceforrisk.org/Projects/ARA_TCE_Risk_Assessment_Guidance_for_Contaminated_Sites_2013.pdf ). ARA judged the range to be 3 micrograms/m3 to 20 micrograms/m3 and suggested that sites with exposure levels primarily below this range (i.e., generally below 3 ug/m3) have a low probability of inducing any noncancer effects in the exposure population. Sites with exposure levels primarily above this range (i.e., above 20 ug/m3), ARA suggests, have a higher probability of inducing any noncancer effects in the exposure population and higher priority for risk management action. These and related topics will be discussed in the upcoming November 4 webinar hosted by ARA at:

AWMA Vapor Intrusion Conference in Philadelphia Sept. 10-11, 2014

The 7th AWMA Specialty Conference on Vapor Intrusion, Remediation, and Site Closure will take place Sept. 10-11, 2014 in the Philadelphia/Cherry Hills area. Abstracts are due by December 16, 2013. Abstracts are being sought which demonstrate innovative, scientific approaches for site investigation and remediation, including those with a vapor intrusion component Information is available at:

Louisiana DEQ issues draft VI Regulations for Public Comment

The Louisiana Department of Environmental Quality's Risk Evaluation/Corrective Action Program (RECAP) regulation has issued draft public comment versions of revisions to the current regulation, promulgated on October 20, 2003. Preliminary draft revisions to Appendix G, which addresses the assessment of the vapor intrusion pathway from subsurface sources to indoor air, have been completed and DEQ welcomes feedback from interested parties. To submit written comments or questions, send an email to RECAP@la.gov. A preliminary draft of Appendix G of the RECAP regulations is posted on DEQ's Website below:

phone: 303-790-1340
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