Radon Mitigation questions and answers rated A+

Radon MitigationWhat are four things that can be addressed when there are elevated levels of radon? - correct answer • sources of radon in the soil, building material and/or well water; • transport mechanisms that drive radon into a building, usually through pressure differentials; • radon entry-pathways that allow radon inside, usually through cracks or openings in the foundation or through open crawlspaces; and • the accumulation of radon and RDPs in the building. What is the most common mitigation technique? - correct answer Controlling radon transport by pressure-driven entry is the most common mitigation technique employed. This is called active soil depressurization (ASD). This technique creates a suction or area of low pressure beneath the structure that is stronger than the partial vacuum applied to the soil by the building. What is an ASD system? - correct answer An active soil depressurization system. ASD systems consist of pipes connected to a fan that draws gases from under the building. Radon is captured and vented to the outside before it has a chance to enter the home. Types of ASD (active soil depressurization) systems include: - correct answer • sub-slab depressurization systems; • drain tile depressurization systems; • sub-membrane depressurization systems; • block-wall depressurization systems; and • a combination of the above methods. What is the EPA's action level for indoor radon? - correct answer If radon is found at or above 4 pCi/l, those levels should be mitigated. What is the average level of radon in outdoor air? - correct answer Outdoor air has an average of approximately 0.4 pCi/L.