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STATEWIDE MAPPING OF FLORIDA SOIL RADON POTENTIALS VOLUME 2. APPENDICES A-P
Citation:
Nielson, K., R. Holt, AND V. Rogers. STATEWIDE MAPPING OF FLORIDA SOIL RADON POTENTIALS VOLUME 2. APPENDICES A-P. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-95/142b (NTIS 96-104369), 1995.
Impact/Purpose:
information
Description:
The report gives results of a statewide mapping of Florida soil radon potentials. Statewide maps identify Florida Regions with different levels of soil radon potential. The maps provide scientific estimates of regional radon potentials that can serve as a basis for implementing radon-protective residential building standards where they are needed. The maps were developed from state soil maps and surface geology maps, which divided the state into 3,919 regions with unique combinations of soil and geologic properties. The potentials of the soil profiles in each region to contribute to indoor radon levels were calculated and used to classify each map region into one of seven tiers of radon potential. The maps were validated by comparisons with more than 1,000 radon flux measurements and with 9,038 indoor radon measurements from three data sets. The comparisons showed consistency between the measurements and the radon potential maps, with approximately the expected numbers of outlier points. Field investigations of the outlier data points showed trends associating certain construction details with positive or negative biases. Radon potentials were calculated using a mathematical model of radon generation and transport from the top 5 m of surface soils into a reference house. Upper confidence limits of 70, 90, and 95% were defined for the radon potentials, in addition to regional median values.