announce the publication of the “Interim Final Vapor Intrusion Guidance ” (WSC#-11-435). This guidance is provided to parties conducting response actions at disposal sites regulated under the Massachusetts Contingency Plan (MCP), 310 CMR 40.0000, to support the identification, assessment, and mitigation of vapor intrusion and compliance with the related provisions of the MCP. Vapor intrusion of environmental contaminants into indoor air is widely recognized as an important and complex issue that poses many challenges. Achieving sufficient certainty in the identification and assessment of the vapor intrusion pathway is critical for ensuring health-protective cleanups that can be relied upon now and into the future. In the course of developing this guidance, MassDEP and external stakeholders have identified provisions in the MCP that could be revised to enhance, expedite and more efficiently assess, mitigate and close disposal sites with vapor intrusion concerns. The Department intends to revise the regulations over the next six months. Following the promulgation of those amendments, MassDEP will revisit this guidance and update it to reflect the regulatory changes, as well as any comments we receive on your experience implementing this interim guidance. I would like to thank the many program stakeholders who have provided valuable input in the development of this document
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