Brent Pautler, Ph.D. (ON) will present “Passive Sampling for Vapor Intrusion Assessment – Let Diffusion do he Work for You!” at the 2020 Virtual Environmental Conference on December 10th.

Brent’s co-presenters are Heidi Hayes, Eurofins Air Toxics; and Todd McAlary, Ph.D., Geosyntec Consultants.

Dr. Brent Pautler is the Customer Service Coordinator at SiREM and an environmental analytical chemist with advanced technical experience in passive sampling, spectroscopy, chromatography, mass spectrometry and chemistry informatics. His is the lead contact at SiREM for passive sampling products and services including the Waterloo Membrane Sampler (WMS™) for vapor intrusion and soil gas, SP3™ and SPeepers™ for sediment pore water and surface water while support SiREM’s bioaugmentation culture clients.

Heidi Hayes is the Technical Director at Eurofins Air Toxics. Ms. Hayes has a MS in Chemistry from the Colorado School of Mines in Golden, CO and over 25 years in the environmental laboratory industry with the last 23 years at Eurofins Air Toxics. In her role as Technical Director, Ms. Hayes oversees the development and validation of new media, protocols and technology related to air phase measurements.

Dr. McAlary has been the Practice Leader for Vapor Intrusion Services at Geosyntec Consultants Inc. for 22 years and recently completed a Doctoral degree with passive sampling as his dissertation subject. He has 32 years of consulting experience, a certificate in university teaching and is an Adjunct Professor at the University of Toronto.

The 2020 Virtual Environmental Conference hosted by the Midwestern States Environmental Consultants Association is a conference dedicated to advancing the professional competence of attendees through education and dissemination of environmental information relevant to the world’s leading businesses.

The Midwestern States Environmental Consultants Association was established to advance the field of environmental consulting by improving the professional competence of our members through education and dissemination of information related to technical developments, regulations, training, and codes, all pertaining to environmental protection. Collectively they represent hundreds of professional consultants along with vendors and suppliers to the environmental consulting community.


This presentation will cover the application of passive sampling for soil vapor, indoor air and outdoor air in support of assessments of subsurface vapor intrusion to indoor air. Theoretical considerations for sampler selection, sorbent selection, sample duration and uptake rate verification will be included. Laboratory considerations for high quality data will be covered in detail. A patented breakthrough for quantifying soil vapor concentration will be discussed. Benefits relative to conventional summa canister/TO-15 methods of sampling and analysis will be presented.

More Information

About the event:
About MSECA:
For consultation regarding Passive Sampling for Vapor Intrusion, contact Brent at
Learn more about Brent:
Learn more about Heidi:
Learn more about Todd: