Summary: | This class presents a comprehensive and interactive discussion on how to understand and assess the vapor intrusion pathway. With increasing regularity, PennDOT's facilities are subject to vapor intrusion assessment as a result of one or a combination of factors including off-site influence. Pennsylvania's vapor intrusion assessment criteria is relatively new and PennDOT has been subjected to a variations in assessment methods and requirements throughout the Commonwealth. The class will provide background and knowledge to determine the need for vapor intrusion assessment, choose the appropriate assessment methodology, and interpret the results.
This course presents a review of the principles behind this risk pathway, a discussion on existing vapor intrusion guidances, a description of the available methods, detailed description of soil gas sampling methods, and recommended sampling protocols for assessing the vapor pathway.
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Learning Outcomes: | A) Understand the vapor intrusion basics including attenuation factors, fate and transport, and contaminant partitioning.
B) Review and select an appropriate method to assess vapor intrusion using groundwater and soil sampling, use of modeling, direct measurement of flux, soil vapor surveys methods.
C) Understand the details of active gas surveys including: sampling and analyses issues, spatial strategy, vertical sampling strategy, sub-slab versus near-slab sampling, chlorinated versus hydrocarbon sites, and accounting for bioattenuation.
D) Review and select an appropriate mitigation methods.
PowerPoint presentation with speaker notes can be found at this location:
P:\penndot shared\Webinars\Environmental Special Topics\Vapor Intrusion
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