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Evaluation of vapor mitigation system effectiveness and unsaturated zone VOC vapor transport using a 1-D vapor model
Miller, Matt
Miller, Matt
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2024
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We assess the potential for successful cessation of a sub-slab vapor intrusion mitigation system (VIMS) at a volatile organic compound (VOC) contaminated site. A numerical model is developed to simulate migration of VOCs within the unsaturated zone where two primary migration pathways are considered: (1) Beneath a building where residual non-aqueous phase liquid contamination may be present, and (2) beneath an adjacent open ground surface where rainfall will infiltrate. Both pathways include vapor migration from contaminated groundwater, but only the building model includes measured shallow soil contamination and only the open-ground pathway includes the effects of migrating infiltration fronts. Model simulations are used to assess the potential for vapor intrusion (VI) following VIMS operation, including the magnitude of remaining source concentrations, infiltration impact, and potential for vapor contaminant rebound. The model, developed using historical data from a VI-impacted Superfund Site with two contaminant sources (shallow soil and shallow groundwater), addresses concerns regarding VIMS deactivation that has been operating since 2016.
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