Hear new voices of radon-induced lung cancer survival woven throughout the Symposium. Be inspired by how three Keynote Speakers diagnosis and recovery shifted personal passions to an action planBe a part of their plan and take away new tools to increase radon testing and mitigation in your service area.  You will discover new directions for radon policy, emerging technical advances in measurement and mitigation, and cutting-edge radon science and research.  Visit  the  Trade Show featuring radon and business-related companies offering useful and interesting products and services.
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Tuesday, October 2 • 2:20pm - 2:40pm
Science & Research: Summary of Research Mitigation System Design and Monitoring

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Todd McAlary, Ph.D., P.Eng., P.G., CUT, William Wertz, Darius Mali
Geosyntec Consultants, Inc.
Toronto, Ontario, Canada
The U.S. DOD sponsored research through the ESTCP Program for improved understanding of mitigation systems for radon and volatile organic compounds under project number ER2013-22.  This presentation summarizes the findings of the 5-year study.  For large buildings, the research indicates that significant improvements in cost-effectiveness can be achieved using a few new lines of evidence and a spreadsheet model.  Lines of evidence include steady vacuum versus radial distance from a suction point, transient vacuum measurements (change in vacuum vs time in response to turning the fan on or off) and fitting data to equations to calculate the transmissivity (T) of the material below the floor slab and the leakance (B) of the floor slab.  Helium tracer testing to measure flow rates below the slab and mass removal rate monitoring provide added value for system design and monitoring.  Case studies of one residence and two commercial buildings will be included.  

avatar for Todd McAlary

Todd McAlary

Practice Leader, Vapor Intrusion Geosyntec Consultants, Inc.
Todd McAlary, Ph.D., P.Eng., P.G., CUTDr. McAlary is a consulting engineer, specializing primarily in sites contaminated with chlorinated solvents for 30+ years.  He has been the Practice Leader for Vapor Intrusion Services at Geosyntec Consultants for 20 years and a member of the... Read More →

Tuesday October 2, 2018 2:20pm - 2:40pm EDT