MAH_2019

Protocol for Conducting Measurements of ANSI/AARST MAH 2019 Radon and Radon Decay Products in Homes 15 8.5.9 Report recommended actions The test report shall include equivalent statements for each of the guidance advisories shown in the Tables 8.5.9.1 and 8.5.9.2 that apply to the test results. Note—An example of an appropriate equivalent message: “The radon measurement indicates that occupants may be exposed to radon concentrations that meet or exceed the EPA action level of 4 pCi/L. It is recommended to fix the building.” 8.5.9.1 Reporting Elevated Radon Concentrations EQUIVALENT STATEMENTS FOR THESE ADVISORIES SHALL BE INCLUDED IN THE REPORT • Fix the building. Test results indicate occupants may be exposed to radon concentrations that meet or exceed the action level, e.g., 4 pCi/L or greater. • Efforts to reduce radon concentrations are not complete until retests provide evidence of effectiveness. — Initiate short-term radon testing no sooner than 24 hours after amitigation system is operational and within 30 days after installation of the system(s). —Test again at least every 2 years to ensure that the system remains effective. If tested with only a single short-term passive detector • If this test is a first test conducted using a single short-term passive detector, test this location again. - If the first short-term test is more than twice the action level (e.g., 8 pCi/L or more): conduct a second short-term test immediately. While decisions to mitigate at any time are not prohibited, the second test aids confidence that decisions are not being made based on a faulty test result. - If the first short-term test is less than twice the action level (e.g., 4 to 8 pCi/L) conduct either a short-term or a long-term test. • If the average of two short-term tests or the average of a long-term test meets or exceeds the action level (e.g., 4 pCi/L or greater), fix the building. Note—If one test result is above the action level with the other test result below the action level and the higher test result is twice or more than the lower test result, obtaining confirmation on whether mitigation is warranted requires additional testing.”