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TECHNICAL GUIDE FOR ASSESSING AND MITIGATING THE VAPOR INTRUSION PATHWAY FROM SUBSURFACE VAPOR SOURCES TO INDOOR AIR
U.S. EPA, Office of Solid Waste and Emergency Response.
OSWER Publication 9200.2-154, 267 pp, 2015

This guide presents EPA's technical recommendations based on current understanding of vapor intrusion into indoor air from subsurface vapor sources. One of its main purposes is to promote national consistency in assessing the vapor intrusion pathway while providing a flexible science-based approach to assessment that accommodates the different circumstances in which vapor intrusion is first considered at a site. The guide is intended for use at any site (and any building or structure on a site) being evaluated by EPA pursuant to CERCLA or the corrective action provisions of RCRA, EPA's brownfield grantees, or state agencies acting pursuant to CERCLA or an authorized RCRA corrective action program where vapor intrusion may be of potential concern. This document and the 2015 Technical Guide for Addressing Petroleum Vapor Intrusion at Leaking Underground Storage Tank Sites supersede and replace EPA's 2002 draft vapor intrusion guidance. http://www.epa.gov/oswer/vaporintrusion/documents/OSWER-Vapor-Intrusion-Technical-Guide-Final.pdf



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