If the radon level is above the EPA action level of 4.0 picocuries per liter (Pc/l), the remedy is a Radon Mitigation System. This usually involves sealing the sump pit and installing a ventilation system that uses a concept called “sub-slab depressurization”, with a special exhaust fan that creates negative pressure under the foundation. This system pulls radon out of the soil below the house and vents it outside.
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