MALB_2014 with 1-21 Revisions

Conducting Measurements of Radon and Radon ANSI/AARST MALB-2014 with 1/21 Revisions Decay Products in Schools and Large Buildings 31 8.3 Summary Report Attachments Immediately attached to or otherwise accompanying a summary report, there shall be supplemental clarity provided in accordance with all requirements of this Section 8.3 . 8.3.1 Test Results Across the Building Floor plan diagrams shall be provided with summary reports that show the average of each test result from all locations where valid test resulted were achieved. Exception: Where residential addresses are not expected to change, narrative identification and vicinity within the building shall be permitted in lieu of floor plan diagrams. 8.3.2 Test Conditions For current or future evaluations for the effect of weather and building operating conditions on the reliability of a test to reflect occupant risk from radon , the summary report attachments shall include: a. The minimum, maximum and average outdoor temperature that existed 12 hours prior to and during the test period; b. If the degree of precipitation was near to flood or drought conditions and if the ground is covered by snow or ice; and c. The seasonal relationship between test conditions and annual average conditions, in accordance with Normative Appendix A . Reporting this relationship shall include: 1. The percentage of time across the year for each differing occupied operating condition , and 2. The operating condition(s) that occurred during the test. Fig. 8.3.2 Example Report Format Informative advisories : 1. Fluctuations in radon concentrations are usually caused by either: — changes in the strength of indoor air pressures that draw soil gas into a building; or — changes in the volume of outside air entering a building. 2. Clear characterization of a radon hazard is more likely to occur when: — Outdoor temperatures extend below 65˚F (18˚C), at least intermittently, which causes natural indoor air pressures that draw radon laden soil gas into a building; and — Heating or cooling distribution fans are at least intermittently active during a test. 3. Measurements more likely to reflect an occupant’s exposure to radon are measurements conducted under conditions that most closely align to the building operating conditions that prevail during the greatest amount of time each year. Outdoor Temperatures Averages Annual During the Test 45˚ 70˚ Operating Conditions Heating Conditions 75% compared to 25% Cooling Conditions - - Mixed Conditions 25% 75% Prevailing Operating Condition Averages Heating Conditions compared to Mixed Conditions Condition less likely to inhibit characterization of a radon hazard Air distribution systems active Air distribution systems intermittent