On April 16, 2013, the US Environmental Protection Agency, Office of Solid Waste and Emergency Response (OSWER), released for public comment draft final vapor intrusion guidance documents. The first guidance document is general guidance for all compounds, while the second guidance document focuses on petroleum released from underground storage tanks.
The draft final guidance represents significant changes from the previous versions proposed in 2002. All persons interested in vapor intrusion issues are encouraged to review the guidance documents and provide input to OSWER. Public input must be submitted by May 24, 2013, through an established website for docket number: EPA-HQ-RCRA-2002-0033-007.