Radon and Chemical Soil-Gas/Vapor Intrusion – Update on Testing Associations by Henry Schuver

H. Schuver*, C. Lutes, C. Holton, J. Kurtz, B. Schumacher, J. Zimmerman and R. Truesdale USEPA – RCRA Cleanup Programs
Washington, DC


While radon typically presents numerically higher risks in indoor air than chemical vapor intrusion (CVI), the risk of CVI typically raises more concerns for the public and is much more expensive and disruptive to assess. However, the similarities between the intrusion of these two components of soil gas could be used to increase the protection of public health from both risks. Recent analyses have shown associations, with 98 and 99% confidence, where the direction of concentration change of indoor radon over time was predictive of the direction of concentration change of chemicals from CVI over hundreds of days, in two well-studied homes with substantial variation in intrusion over time. This suggests radon is a tracer incorporating many building-specific variables. Evidence from further testing of additional buildings from across the US, for both temporal and spatial associations between indoor concentrations of radon and chemicals from soil gas/vapor intrusion, is present. 

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