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- W2968235812 abstract "Abstract Vapor intrusion (VI) involves migration of volatile contaminants from subsurface through unsaturated soil into overlying buildings. In 2015, the US EPA recommended an approach for screening VI risks associated with gasoline releases from underground storage tank (UST) sites. Additional assessment of the VI risk from petroleum hydrocarbons was deemed unnecessary for buildings separated from vapor sources by more than recommended vertical screening distances. However, these vertical screening distances did not apply to potential VI risks associated with releases of former leaded gasoline containing 1,2‐dichloroethane (1,2‐DCA), because of a lack of empirical data on the attenuation of 1,2‐DCA in soil gas. This study empirically evaluated 144 paired measurements of 1,2‐DCA concentrations in soil gas and groundwater collected at 47 petroleum UST sites combined with BioVapor modeling. This included (1) assessing the frequency of 1,2‐DCA detections in soil gas below 10 −6 risk‐based screening levels at different vertical separation distances and (2) comparing the US EPA recommended vertical screening distances with those predicted by BioVapor modeling. Vertical screening distances were predicted for different soil types using aerobic biodegradation rate constants estimated from the measured soil‐gas data combined with conservative estimates of source concentrations. The modeling indicates that the vertical screening distance of 6 feet (1.8 m) recommended for dissolved‐phase sources is applicable for 1,2‐DCA below certain threshold concentrations in groundwater, while 15 feet (4.6 m) recommended for light nonaqueous phase liquid (LNAPL) sources is applicable for sites with clay and loam soils in the vadose zone, but not sand, if 1,2‐DCA concentrations in groundwater exceed 150 μg/L. This dependence of the predicted vertical screening distances on soil type places added emphasis on proper soil characterization for VI screening at sites with 1,2‐DCA sources. The soil‐gas data suggests that a vertical screening distance of 15 feet (4.6 m) is necessary for both dissolved‐phase and LNAPL sources." @default.
- W2968235812 created "2019-08-22" @default.
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- W2968235812 date "2019-09-09" @default.
- W2968235812 modified "2023-09-30" @default.
- W2968235812 title "Vertical Screening Distance Criteria to Evaluate Vapor Intrusion Risk from 1,2‐Dichloroethane (1,2‐DCA)" @default.
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- W2968235812 doi "https://doi.org/10.1111/gwmr.12351" @default.
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