Vapor Intrusion Guidance Continues to Take Form With the Release of EPA’s Final Draft Guidance

The United States Environmental Protection Agency (“EPA”) recently released its long-awaited final vapor intrusion draft guidance (“Final VI Guidance”). The nearly 200-page document establishes a complex framework for assessing vapor intrusion from analyzing key factors; making risk management decisions; and implementing, monitoring and terminating mitigation strategies and is intended to be used at any site that is being evaluated under CERCLA, RCRA, EPA’s brownfield grantees, or state agencies with delegated authority. The Final VI Guidance supercedes all prior EPA guidance documents addressing vapor intrusion assessment and mitigation including the 2002 Draft Vapor Intrusion Guidance, but takes into account the public comments submitted from 2002 through 2012 and the recommendations of the Office of Inspector General (OIG).