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 28 8.2.5 Low Radon Concentrations Guidance in summary reports and otherwise provided where test results are below the action level shall comply with all applicable requirements in a), b) and c) of this Section 8.2.5 . a) Specific messages The final summary report shall include equivalent statements for each of the guidance messages shown in Table 8-A where test results are below the action level . b) Seasonal reliability If not already accounted for, additional testing shall be recommended, no later than within the first year after occupancy or ownership of property management, where: 1. Testing was not conducted under conditions that are representative of the normal occupied building operating condition that prevails during the greatest amount of time each year; or 2. Testing was conducted under conditions that inhibit clear characterization of a radon hazard. c) Post-mitigation Where the low test result is related to verifying mitigation effectiveness, the final summary report shall include all applicable requirements in b), c), d) and e) of the following Section 8.2.6 . 8-A Reporting Low Radon Concentrations EQUIVALENT STATEMENTS FOR THESE ADVISORIES SHALL BE INCLUDED IN THE REPORT. “Consider fixing the building if test results indicate radon concentrations greater than half the action level, (e.g., between 2 and 4 pCi/L). Responsible care requires repeating initial testing procedures for all building(s) at least every 5 years and in conjunction with any sale of a building. Radon testing should also be conducted when any of the following circumstances occur: ü a new addition is constructed or alterations for building reconfiguration or rehabilitation occur; ü a ground contact area not previously tested is occupied, or a building is newly occupied; ü heating or cooling systems are significantly altered, resulting in changes to air pressures or pressure relationships; ü ventilation is significantly altered by extensive weatherization, changes to mechanical systems or comparable procedures; ü significant openings to soil occur due to: — groundwater or slab surface water control systems that are altered or added (e.g., sumps, perimeter drain tile, shower/tub retrofits, etc.) or, — natural settlement causing major cracks to develop; ü earthquakes or construction blasting, fracking or formation of sink holes nearby; or ü a mitigation system is altered, modified or repaired. Should testing indicate concentrations that meet or exceed the action level, conduct evaluations, corrections and further testing until radon concentrations have been mitigated to below the action level.”