Final EPA Vapor Intrusion Guidance Released

Aug 13, 2015

Golder's summary outlines the important changes to vapor intrusion evaluation methodologies discussed in the OSWER Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway from Subsurface Vapor Sources to Indoor Air, released in June 2015, by the United States Environmental Protection Agency (EPA).

The new guidance document covers residential and nonresidential settings, and is intended for use at brownfield redevelopment sites, sites being evaluated by EPA in accordance with CERCLA, and sites being evaluated under authorized RCRA corrective-action programs. Two important aspects of the new guidance discussed in our summary are the:

  • Emphasis on using multiple lines of evidence to determine if unacceptable, site-related vapor intrusion risk exists
  • Reclassification of more than 100 chemicals as volatile, based on new volatility criteria
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Golder's experienced team of environmental engineers and scientists, geologists and hydrogeologists, toxicologists and risk assessors, and civil, mechanical, and electrical engineers has completed vapor intrusion assessments and mitigation projects worldwide. From plan development to assessment and implementation, we can address your challenges and create optimal solutions.


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Download and review our Golder Bulletin: EPA's 2015 Vapor Intrusion Guidance today.

For more information, contact:
Marie Lewis,
Senior Environmental Scientist
Tel: +1(856) 793-2005

Ian Hers, Ph. D., P. Eng.
Principal, Vapor Intrusion Practice Leader
Tel:+ 1(604) 296-4223