Groundwater Impacts and a Complete Exposure Pathway: Vapor Intrusion (VI) Case Studies with Mitigation Options
Various parameters of groundwater impacts affect the potential for a complete VI exposure pathway. These parameters include contaminant concentrations, depth to groundwater, lateral distance from groundwater impacts to occupied buildings, lithology of the unsaturated zone, and the individual characteristics of the Potential Contaminant (PC) at the Site.
There are several mitigation techniques currently available for sites with a complete/potentially complete VI exposure pathway. While numerous techniques are available for new construction (such as a vapor barrier, preemptive passive/active systems, and other new industry-specific products), the most common/effective strategy for existing buildings continues to be the installation/operation of Sub-Slab Depressurization Systems (SSDSs). These SSDSs introduce a pressure differential between the indoor air and sub-slab air. This pressure differential prevents the site PCs from entering the occupied building.
This poster will enable the reader to discover new sampling techniques, how to evaluate analytical data to determine the VI potential (with a focus on contaminant concentrations, depth to groundwater, and lithologic conditions), and learn about the common VI mitigation techniques. This poster will include case studies in which groundwater impacts have led to a potentially complete VI exposure pathway and the VI mitigation techniques used to effectively mitigate VI.