MAH_2019

Protocol for Conducting Measurements of ANSI/AARST MAH 2019 Radon and Radon Decay Products in Homes 13 2. the beginning and ending dates and times of the exposure period and information on the detector locations such as a diagram, photos or narrative description. b) Radon gas results reported in picocuries per liter (pCi/L) shall be reported to only one digit after the decimal (e.g. 3.2 pCi/L). If the average of two measurements produces a result of ≥ 3.95 pCi/L, standard mathematical rules should be followed, and such average shall be reported as 4.0 pCi/L. c) The average of collocated measurement detectors shall be reported as well as the individual results. d) Measurements made in separate locations shall not be averaged. Detectors located more than 8 inches (20 cm) from each other shall be considered to be in separate locations. They shall be reported individually. 8.5.3 Continuous monitors reports Additional requirements when using and reporting continuous radon monitor test results include: a) hourly data shall either be included in the test report or provided to the client upon request; b) the calibration date of continuous monitor(s) shall be included on the test report; and c) removal of or “backing out” portions of hourly data imbedded within the contiguous sampling period reported (such as to account for weather or other conditions) shall invalidate the measurement. Exceptions: 1. The first 4 hours of data are to be discarded or incorporated into the result using system correction factors (EPA 402-R-92-004, EPA 1992); 2. The first 12 or more hours are to be discarded in reported results as required for meeting closed-building requirements in Sections 4 , 6.1.2 and 7.3.2 b ; and 3. The first 24 or more hours are to be discarded in reported results as required in Section 7.3.2 b after activation of a mitigation system fan or completion of other mitigation efforts, for evaluation of post- mitigation effectiveness. 8.5.4 Report temporary conditions A specific client advisory and description shall be included in the test report of observed temporary building conditions or other factors that may cause the test to not reflect the client’s risk from radon, such as unusually local severe weather. This requirement also extends to the following conditions that shall be included in the report if: a) the property tested was vacant during the test period; b) systems were temporarily ventilating with outdoor air for seasonal comfort or energy savings during the test period, including: 1. Closable passive crawl space vents were open during the test period but are normally closed in cold weather because of energy penalties or the likelihood of frozen water pipes. Note— Crawl space humidity control systems that function during all seasons are not a temporary condition; 2. Window air conditioners did not have closed outside air dampers during the test period; 3. Energy recovery or heat recovery ventilators were operating under either of the following conditions: i. the systemwas not set to the lowest outdoor air ventilation rate that occurs for any season. ii. all thermostats in the building were not set to normal occupiable temperatures ; 4. Evaporative cooling systems were operating or not covered during the test period; and