June 18, 2015

The US EPA released in June 2015 the Vapor Intrusion Guidance Document in its final version: OSWER Technical Guide for Assessing And Mitigating the Vapor Intrusion Pathway from Subsurface Vapor Sources to Indoor Air. In 2002, the EPA released the DRAFT version of the document which quickly became outdated as practices and knowledge rapidly developed in managing sites with vapor intrusion concerns.