The draft Florida residential construction standard for radon control is based on requiring radon controls only in regions of the state where they are needed. A radon protection map was developed that identifies regions that require no special radon controls, regions where only passive radon controls are needed, and regions that require both active and passive radon controls. The radon potentials upon which the map is based are determined by calculating annual radon entry into a reference house using regional radon source term, radon transport, and soil characteristics. The interfaces between the map categories were determined from a cost-benefit analysis that considered all soil polygons in the state. The cost-benefit analysis yielded a confidence limit of 95 percent to be associated with the state's indoor radon limit of 4 pCi L"'. A site-specific radon potential determination alternative was also included in the standard
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