Vapor Intrusion Pathway Assessment: State-of-the-Practice and Opportunities for v3.0
2010
Johnson, Paul C | Fulton, Ira A
Presented at the Annual Partners in Environmental Technology Technical Symposium & Workshop (15th), Washington, DC, 30 Nov - 2 Dec 2010. Sponsored by SERDP and ESTCP. U.S. Government or Federal Rights License
Show more [+] Less [-]Guidance for assessing the soil vapor-to-indoor air exposure pathway continues to evolve with documents being drafted by regulatory agencies, industry, and industry-regulatory collaborations. While variable across the federal, state, and local levels, guidance is converging toward a multiple-lines-of-evidence-based paradigm that involves combinations of indoor air sub-slab soil gas, deeper soil gas, groundwater, and soil sampling in addition to screening-level modeling. There are concerns about implementing this type of guidance due to questions about current data collection methods, possible indoor air sources, a lack of knowledge about temporal behavior, not knowing how to deal with conflicting lines of evidence, and pathway assessment costs. This talk will provide an overview of current issues with pathway assessment and tie those to ongoing studies and opportunities for future research, and discuss alternate pathway assessment paradigms.
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