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MP5 Assessing Contaminated Soil Sites
(129) Identification of Critical Issues in the Assessment of Subsurface Vapor Intrusion Risks at Industrial Sites.
Huntsman, B1, Staples, C2, Athmer, C1, 1 Terran Corporation, Beavercreek, OH, USA2 Assessment Technologies, Inc, Fairfax, VA, USA
ABSTRACT- Risk-based evaluations of contaminant pathways at industrial sites must consider vapor intrusion to indoor air from underlying soils and groundwater. Johnson and Ettinger (J&E) developed a one-dimensional analytical model that considers convective and diffusive vapor transport. The model is used by the regulated community to predict indoor air concentrations in residential buildings near hazardous waste facilities. Model input parameters include contaminant chemical properties, saturated and unsaturated soil properties, and structural properties of the building. The J&E model was designed primarily for residential building evaluations assuming the total building footprint is exposed to contaminant vapors. To convert the J&E model, which was originally applied to residential sites, for use at industrial facilities, several key parameters needs to be adjusted using site-specific data. For example, floor integrity and the only partially affected perimeter have a large influence on the actual indoor air concentrations caused by vapor intrusion. A study was completed at an industrial facility with known soil contamination that compared the modeled indoor air concentrations of contaminants of concern with actual measured contaminant concentrations at various locations and times. Potential risk to building occupants was assessed using both the J&E model and measured results. Overall, the results suggest that the J&E model can be successfully converted for use at industrial facilities to support risk assessment and remediation decisions regarding volatile organic compounds.
Key words: volatile organic compounds, indoor air , soil contamination, analytical models
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