Vapor Intrusion Exposure:
Long-Term Evidence-Based Protection & Sustainability in
Residential, Commercial, and Industrial Buildings
The 25th Annual AEHS International Conference on Soil, Water, Energy, and
Air—March 23-24, 2015, San Diego, CA
Presenter Bios
Nathaniel L. Burden, Jr., Fidelity Inspections and Consulting Services, Warminster, PA
“Nate” is the Director of Environmental Services and Training Director for Fidelity Inspection and Consulting
Services and attended Carnegie-Mellon University with graduate studies in Nuclear Engineering. He was a
nuclear operator for the now decommissioned Shippingport Atomic Power Station-LWBR and Beaver Valley
Nuclear Power state in Beaver Valley, PA. Nate has over 25 years in environmental and nuclear decontamination
and chemical clean-up and risk assessment. He has been involved in VI and radon projects where he has
provided the initial risk communication to the communities, condominium complexes and low income housing
in the Pennsylvania. He has provided risk communication packages to the military housing families, American
military schools and German environmental engineering groups on radon risks and mitigation reduction
strategies for Garmisch-Partenkirchen, Germany (Artillery Karserne and the Marshall Center), Livorno, Italy
(Camp Darby). He has also been in involved in specialized hype-sensitive radon reduction for the Sudbury
Neutrino Laboratory (SNO) in cooperation with the Argonne National Laboratory with new radon mitigation
methodologies. Licensed radon mitigation contractor in Pennsylvania since 1986 and have installed over 2000
radon mitigation systems (residential, commercial and military), along with full radon mitigation systems in malls
in Pennsylvania. Nate was received a EPA/PA DEP SIRG grant in communicating, empowering low-income
minority communities in Easter Pennsylvania and completing free of charge to the families over 50 radon
mitigations along with long-term cleaning and quality of life practices (smoking, HEPA vacuuming, etc.) Nate
considers the issue of proper risk communication to a VI impacted community as mission critical component
that often not given the priority or proper preparation that is needed. Have performed numerous environmental
professional career days for middle and high schools in Pennsylvania with student radon projects. There is
uniform preparation plan that should be part of any VI project. Also member of the American Association of
Radon Scientists and Technicians (AARST) along with being a board member of the PA AARST chapter and the
Indoor Air Quality Association/ASHRAE. Also a member of the Worldwide Employee Relocation Council and EPA
CIAQ.
Daniel Carr, P.E., P.G., Sanborn|Head & Associates, Portland, ME
Daniel Carr, a Senior Principal Emeritus with Sanborn Head & Associates, Inc., is a registered professional
engineer and geologist with over 30 years of experience. With an M.S. degree from the Groundwater Program
at Colorado State University, Dan brings expertise in vadose zone processes which have been applied to many
projects related to vapor intrusion. Since its inception in 2002, Dan has served as the principal investigator on
the Endicott NY Groundwater Vapor Project.
Dr. Helen Dawson, Geosyntec, Falls Church, VA
Helen Dawson, Ph.D., is a senior consultant with Geosyntec Consultants and has more than 30 years of
experience in private practice, academia, and public service. Dr. Dawson’s prior experience includes serving as
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US EPA’s Chief of the Superfund Science Policy Branch in Washington DC. In this role, she was responsible for
developing Superfund program policy and guidance incorporating scientific advances in characterization and
cleanup of contaminated sites. Prior to that position, Helen served as the US EPA Region 8 (Denver) Superfund
Hydrogeologist, where she oversaw contaminant characterization and remedy monitoring at the Region’s
groundwater sites. Dr. Dawson is a recognized leader in the field of vapor intrusion. She was the primary author
of the U.S. EPA’s Office of Solid Waste Emergency Response (OSWER) Draft Guidance for Evaluating the Vapor
Intrusion to Indoor Air Pathway from Groundwater and Soils in 2002. She also was the primary investigator and
author on two key technical US EPA documents that support vapor intrusion assessment: US EPA’s 2012 VI
database paper (“EPA's Vapor Intrusion Database: Evaluation and Characterization of Attenuation Factors for
Chlorinated Volatile Organic Compounds and Residential Buildings”) and US EPA’s 2011 background indoor air
paper (“Background Indoor Air Concentrations of Volatile Organic Compounds in North American Residences”).
She also developed US EPA’s Vapor Intrusion Screening Level Calculator. Since joining Geosyntec she has
successfully derived defensible site-specific vapor intrusion attenuation factors to support risk assessment and
development of subsurface media cleanup levels. She also has received research funding from the US
Department of Defense to demonstrate the use of mass flux monitoring as an alternative approach for VI
assessment. Education: Stanford University, Ph.D., Civil/Environmental Engineering, 1992; Colorado School of
Mines, M.Sc., Geochemistry, 1981; Stanford University, B.Sc., Geology, 1978.
David Gillay, Barnes & Thornburg LLP, Indianapolis, IN
David Gillay is a partner in the Indianapolis office of Barnes & Thornburg. He heads the Brownfields and
Environmental Transactional Practice Groups and provides environmental counseling in connection with
assessing environmentally challenged properties. Over the last decade, David has focused on the legal,
regulatory, and technical impact and implications related to the vapor intrusion pathway. He also represents an
influential multi-state environmental consultants’ association and works closely with leading technical experts
on a wide array of environmental matters, including rapidly evolving vapor intrusion guidance. Prior to joining
Barnes & Thornburg, he obtained an advanced environmental engineering degree and practiced as an
environmental consultant on various projects across the country. David can be reached at (317) 231-7474 or
dgillay@btlaw.com.
Doug Grosse, U.S. EPA ORD National Risk Management Research Laboratory, Cincinnati, OH
Douglas W. Grosse has a B.A. in English Literature from Ohio University and an M.S. in Environmental
Engineering from the University of Cincinnati. He has worked as an Environmental Engineer at the U.S.
Environmental Protection Agency (EPA) in Cincinnati, Ohio for the past 36 years. Mr. Grosse is currently working
in EPA's National Risk Management Research Laboratory (NRMRL) as a Senior Environmental Engineer. Past
experiences have included: in-house research at EPA's pilot plant facilities in wastewater and hazardous waste
research; pilot facility manger and project officer (Center Hill Laboratory); Superfund Innovative Technology
Evaluation (SITE) Program; RCRA corrective action coordinator and technical assistance in Superfund, RCRA and
treatability study assistance, as an aqueous treatment specialist, Acting Branch Chief, Technology Transfer
Branch, and ETV/AMS Center PO. Most recently, Mr. Grosse has worked in the Remediation and Redevelopment
Branch and Engineering Technical Support Center, as a specialist in site remediation and technology transfer. He
retired from EPA in January, 2015. Currently, he is serving as a professional consultant.
Megan Hamilton, EnviroForensics, Indianapolis, IN
Megan Hamilton is the Director of Vapor Intrusion and Risk Assessment for the Environmental Forensic
Investigations, Inc. (EnviroForensics) team and has over 15 years of experience in environmental regulatory
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oversight and consulting. She develops, helps implement, and oversees the VI investigations and mitigation for
all of EnviroForensic’s projects. She is also the main contact for risk communication issues and community
outreach development. Her diversified professional experience includes research, policy development, technical
writing, public outreach, vapor intrusion investigation and remediation, data analysis and interpretation, human
health risk assessment, and conceptual site model analysis. Ms. Hamilton served as the coordinator and team
leader for the Indiana Department of Environmental Management’s (IDEM) Vapor Intrusion Workgroup for six
years and is the principal author of the current Indiana Vapor Intrusion Guidance. Ms. Hamilton has presented at
several National Conferences, is a member of the National VI Science Advisory Committee, and currently serves
on the Board of Directors for the Midwestern States Environmental Consultants Association (MSECA). Ms.
Hamilton can be reached at (317) 972-7870 or mhamilton@enviroforensics.com.
Thomas Hatton, Clean Vapor, LLC, Blairstown, NJ
Tom has over 30 years of leadership experience in the design and installation management of radon and vapor
intrusion mitigation systems totaling approximately 10,500 combined commercial and residential properties. As
Clean Vapor’s CEO and Project Director, he is responsible for providing leadership and direction in a rapidly
changing and growing industry. With a background of developing detection equipment and implementing
innovative mitigation technology, Tom has contributed to multiple state and national mitigation standards and
guidance documents. Tom is a licensed Radon Mitigation and Measurement Specialist and NRPP Radon
Mitigation Provider. He has authored multiple technical papers and guidance/fact sheets on energy efficient soil
gas venting systems for new construction and existing buildings. Tom is the patent holder of the next generation
energy efficient, dynamic controls and remote management technology for vapor systems.
Heidi Hayes, Eurofins Air Toxics, Sacramento, CA
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 20 years in the environmental laboratory industry designing and testing
new analytical methods with the last 18 years at Eurofins Air Toxics. She currently oversees the testing of new
media, protocols, and technology related to air phase analysis. Her recent research activities have been focused
on meeting the challenges of the vapor intrusion investigations from soil gas collection and analysis to trace
level indoor air VOC methods. She serves as a resource for the regulatory community in evaluating soil gas and
indoor air sampling and analytical protocols and has presented several papers specific to these topics. Over the
last several years, Ms. Hayes’ research has concentrated on the effectiveness of passive sampling techniques to
collect time-integrated VOC measurements in indoor air. In this effort, she has collaborated on EPA-funded
projects designed to evaluate and compare passive technologies to standard methods.
Dr. Ian Hers, P.E., Golder Associates, Vancouver, BC
Ian Hers is a senior consultant and Principal of Golder Associates located in Vancouver, B.C., Canada with 26
years professional experience, and is the global vapour practice leader for Golder Associates. Much of his work
over the past two decades has focused on the evaluation of soil vapor fate and transport, vadose zone
processes, and the prediction, measurement and mitigation of soil vapour intrusion into buildings. He is highly
familiar with soil gas and indoor air characterization techniques, appropriate methods to obtain high quality,
defensible data, and regulatory guidance and analytical and numerical models for this pathway. He has
developed guidance for numerous regulatory agencies including U.S. EPA, Health Canada, UK Environmental
Agency, and several provinces and states in Canada and the U.S. He is the principal investigator for several
current or recently completed applied research projects for the American Petroleum Institute, Shell Global and
Electric Power Research Institute. Dr. Hers holds a Ph.D. in Civil Engineering (University of British Columbia), is
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on the Board of Directors of the Science Advisory Board for Contaminated Sites, and is a member of the
Contaminated Sites Approved Professionals in British Columbia.
Kyle Hoylman, Protect Environmental, Louisville, KY
Kyle Hoylman founded Protect Environmental in 2005, where he currently serves as the managing partner. He
has worked on more than 100 vapor intrusion projects over the past 9 years, focusing on VI assessment,
mitigation and long-term risk management. Kyle currently serves on the task force working to develop the
national vapor mitigation contractor credential and ANSI standards. He also serves on the board of the
American Association of Radon Scientists and Technologists (AARST), and is involved with ongoing research
projects regarding the economic impact of radon-induced cancer and the effectiveness of national lending
guidance for multifamily radon assessments. Kyle can be reached at 502-410-5000 or
Kyle@ProtectEnvironmental.com.
Dr. Paul C. Johnson, Arizona State University, Tempe, AZ
Dr. Johnson is a Professor and the Dean of the Ira A. Fulton Schools of Engineering, which is one of the largest
engineering schools in the U.S. with almost 17,000 students. Dr. Johnson’s expertise is in soil and groundwater
remediation and risk assessment, specifically, the design, monitoring and optimization of remediation systems
and the monitoring and modeling of exposure pathways. His research group is currently engaged in field, lab,
and modeling studies of the vapor intrusion pathway, including the evaluation of pathway assessment
approaches and testing the effectiveness of VI mitigation strategies.
Dr. Loren Lund, CH2M Hill, Shelley, ID
Dr. Lund has over 24 years of experience in environmental risk and vapor intrusion (VI) assessments. He became
involved with assessing vapor intrusion 20 years ago as a regulatory toxicologist for the state of Texas. Loren is
CH2M HILL’s Vapor Intrusion Practice Leader and is responsible for overseeing/training staff and insuring vapor
intrusion best practices are applied. He is responsible for the company’s compendium of best practices,
standard operating procedures, quality assurance procedures, and VI website. Dr. Lund is an organizing
committee member, classroom instructor, session chair, and presenter for the Air and Waste Management
Association (AWMA) VI specialty conferences. He is a member and internet instructor for the Interstate
Technology Regulatory Council (ITRC) Petroleum VI team, co-chairs the Navy VI Focus Group, a co-author of the
Navy 2011 Background Indoor Air Guidance for VI, and the senior technical leader for the Navy Web-based VI
Tool and the current Navy Environmental Sustainability Development to Integration (NESDI) VI Decision
Framework database project. He has reviewed multiple national VI guidance documents, authored more than a
dozen papers, and has been a session chair or featured speaker at over a dozen VI conferences or sessions since
2004. Loren has presented over a dozen webinar training sessions on VI assessment and mitigation in the last
five years. He earned a bachelor’s degree in chemistry, a Ph.D. in biochemistry, and was a post-doctorate and
adjunct professor in toxicology at the University of Texas in Austin.
Chris Lutes, CH2M Hill, Raleigh, NC
Christopher Lutes (Chris) is a Principal Technologist with CH2MHILL in Raleigh NC. Mr. Lutes has 23 years of
experience managing vapor intrusion (VI) projects, technology evaluations, remediation projects, treatability
studies, pollutant fate and transport studies, and air emissions characterizations. His primary role is developing
client site strategies and cleanup solutions as a leader in CH2M HILL’s Site Remediation and Revitalization
practice. Mr. Lutes is a nationally recognized expert in the study of the intrusion of contaminated vapors into
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buildings. He was a lead author for the EPA engineering issue on Vapor Intrusion Mitigation, coauthored a
recent EPA report on oxygen shadows beneath buildings and has authored more than 125 other publications.
Two EPA engineering issue papers he coauthored – one on the application of passive samplers for vapor
intrusion and the other on the uses of excavation at VI sites are expected to be released in early 2015. He has
worked with EPA to conduct and publish several research studies on aspects of vapor intrusion including uses of
radon as a tracer, temporal variability and passive sampling methods. Having worked on commercial vapor
intrusion projects in more than 15 states and several countries Mr. Lutes is highly familiar with the complex and
swiftly evolving status of regulatory guidance in vapor intrusion. His knowledge of building systems is not only
scientific – he also has extensive hands on experience in building renovation and property management. Mr.
Lutes is serving as a member of the ANSI/AARST committee writing a vapor intrusion mitigation standard for 1-4
family residential buildings. He has recently completed a study of the vapor intrusion characteristics of a
database of 49 military commercial/industrial buildings. That study is expected to facilitate the acceptance of
more appropriate screening levels and attenuation factors for commercial buildings. Mr. Lutes holds a B.S. in
Chemistry from the University of Virginia and an M.S. in Environmental Science and Engineering from the
University of North Carolina at Chapel Hill.
Dr. Todd McAlary, P.E., P.G., Geosyntec Consultants, Inc., Guelph, ON
Todd McAlary is the Vapor Intrusion Practice Leader for Geosyntec Consultants, Inc. He has degrees in
Geological Engineering and Hydrogeology from the University of Waterloo, where he measured and modeled
vapor diffusion through unsaturated sands as his Master’s Thesis. Mr. McAlary has over 20 years of consulting
experience, primarily for Fortune 500 companies in the United States. He has conducted site-specific
investigations of vapor intrusion since 1992, co-authored or peer reviewed over a dozen guidance documents on
vapor intrusion over the past 12 years, and has presented research in this field at over 40 conferences,
workshops, and training sessions. He received the 2006 Industry Recognition Award for his contribution to the
ITRC vapor intrusion guidance and has been a member of the Federal EPA Expert Panel on Vapor Intrusion since
2000. Mr. McAlary is currently managing large-scale vapor intrusion investigations for the DOD, conducting
applied research for ESTCP, the Navy and the Air Force to improve vapor intrusion assessment methods,
completing a part-time Ph.D. in Chemistry and teaching part-time at the University of Toronto.
Tony McDonald, A-Z Solutions, Inc., Canton, OH
Tony McDonald is the Vice President of Operations at A-Z Solutions and acts as Senior Project Director
overseeing all commercial and residential vapor intrusion systems. He is a member of the board of directors of
the American Association of Radon Scientists and Technologist (AARST). He is also a committee member of the
AARST/ANSI Residential Radon/VI Mitigation Standards committee. Tony has a Bachelor of Science Degree from
Mount Union University
Lenny Siegel, Center for Public Environmental Oversight, Mountain View, CA
Lenny Siegel has been Executive Director of the Center for Public Environmental Oversight since 1994. He is one
of the American environmental movement’s leading experts on both military facility contamination and the
vapor intrusion pathway, and for his organization he runs two Internet newsgroups: the Military Environmental
Forum and the Brownfields Internet Forum. In July 2011 Siegel was awarded U.S. EPA’s Superfund Citizen of the
Year award. Siegel serves on numerous advisory and technical committees, including the ITRC Munitions
Response Classification and Complex Sites Work Teams and the Moffett Field Restoration Advisory Board. Siegel
has served on a dozen U.S. National Research Council (National Academies of Sciences) committees. In
November 2014 he was elected to the Mountain View, California City Council.
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Dr. Brian Schumacher, U.S. EPA ORD National Exposure Research Laboratory, Las Vegas, NV
Brian Schumacher is the Branch Chief of the Environmental Chemistry Branch of the United States
Environmental Protection Agency’s Office of Research and Development in Las Vegas, NV. Brian was hired by
the U.S. EPA in 1991 to take the lead and address ways to improve the sampling and analysis of soils
contaminated with volatile organic compounds. This research has led to his natural progression into the arena
of vapor intrusion. Dr. Schumacher is currently conducting research in numerous areas related to vapor
intrusion including: the improvement/standardization of soil gas sampling methodologies; the spatial and
temporal variability of VOCs in the environment (in both subslab and uncovered areas), and passive vapor
intrusion sampling. His recent research efforts have been focused on looking at the long-term (>1 year)
temporal and spatial variability of VOC and radon concentrations in and around a home in Indianapolis, Indiana.
The latest research effort at the Indianapolis house is designed to examine the influence of an installed
mitigation system on the fluctuation of VOC and radon concentrations.
Dr. Henry Schuver, U.S. EPA OSWER Office of Resource Conservation and Recovery, Washington, DC
Originally trained as geologist (BS, MS), Henry Schuver began his environmental career in the hazardous waste
program in New Jersey Department of Environmental Protection (NJDEP; 1986-1989), proceeded to private
consulting (1989-1995), returned to a regulatory position as Resource Conservation and Recovery Act (RCRA)
case manager in U.S. EPA Region 2 (1995- 1997) and then transferred to U.S. EPA headquarters RCRA Cleanup
Program. In headquarters to help meet GPRA requirements he authored the 1999 guidance for multiple
pathway RCRA Environmental Indicators (EIs) for Human Health and Groundwater Under Control
determinations, which became the model for Superfund program’s EI and are still used as common metric for
progress at cleanup sites for the Agency-wide annual Report on the Environment. For the EI guidance he
convinced the RCRA program to evaluate indoor air at all of the high priority sites and managed the
development of the 2001 RCRA vapor Intrusion (VI) guidance which lead to the OSWER-wide 2002 draft and
2012 draft-final VI guidance efforts. Over the years in headquarters he has lead national conferences on EIs and
more recently VI, earned his Dr. of Public Health degree, and is currently focused on evidence-based approaches
to maximize the health benefits and cost-effectiveness of VI efforts for all parties involved.
David Shea, P.E., Sanborn|Head & Associates, Concord, NH
David Shea, P.E. has 25 years of experience as an environmental and site remediation engineer, the last 12 of
which have included vapor intrusion assessment and mitigation design for residential, commercial, and
industrial buildings. He is a Principal Engineer with Sanborn, Head & Associates in Concord, New Hampshire. He
is responsible for leading vapor intrusion and environmental remediation projects throughout the US and
abroad. He holds a B.S. in Civil Engineering from Princeton University and a M.S. in Civil Engineering from M.I.T.
He is a licensed professional engineer in 12 states.
Dr. Lloyd "Bo" Stewart, P.E., Praxis Environmental Technologies Inc., Burlingame, CA
Dr. Lloyd Stewart is Vice President and founder of Praxis Environmental Technologies, Inc. For 23 years, Praxis
has dedicated itself to developing innovative, cost-cutting technologies for both the government and private
sector. Dr. Stewart has a variety of technical expertise and experience. These include remedial design and
operation, site characterization, and transport modeling. For example, he developed a well logging technology,
known as PneuLog®, to characterize the vadose zone and optimize soil vapor extraction (SVE) systems. In total,
Praxis has performed site characterization, SVE optimization and site closure at nearly 100 Air Force sites,
several Army sites, many Superfund sites, and numerous private sector sites under Dr. Stewart’s direction. The
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Army Corps of Engineers contracted with Dr. Stewart to prepare an appendix on evaluation of SVE rebound data
for the Army Corp of Engineer’s Soil Vapor Extraction and Bioventing Engineer’s Manual (EM 1110-1-4001). Dr.
Stewart is also a co-inventor of an in situ steam injection process. He has designed and overseen numerous
successful applications of steam injection and thermal enhanced SVE including the first application of steam
injection to address DNAPL accumulated below the water table. Dr. Stewart received his Ph.D. from the
University of California Berkeley, an MS degree from Georgia Institute of Technology, and a BS from North
Carolina State University, all in mechanical engineering. He is a registered PE in CA.
Robert S. Truesdale, RTI International, Research Triangle Park, NC
Robert Truesdale is a Senior Research Geologist with RTI International. Mr. Truesdale has worked in support of
U.S. EPA research on multimedia environmental pollution issues for over 35 years, with work ranging from
sampling and analysis to risk assessment. One of the principal technical authors of EPA’s Soil Screening
Guidance, Mr. Truesdale has been involved in vapor intrusion research and regulatory development since 2000,
including work for the Indiana Department of Environmental Management and EPA’s ORCR, ORD, and OUST. He
has managed and organized 10 consecutive vapor intrusion technical workshops and two stakeholder forums for
EPA ORCR and ORD. He received a B.A. in Geology from Duke University in 1975 and a M.S. in Geologic Sciences
from the University of Maine in 1975. He has worked at RTI since 1978.
Nadine Weinberg, ARCADIS U.S., Inc. (ARCADIS), Portland, ME
Ms. Nadine Weinberg is a Principal Scientist at ARCADIS with more than 20 years of experience working on
projects involving the evaluation of human health risks including the vapor intrusion pathway. Currently Ms.
Weinberg serves as ARCADIS’ National Technical Lead for vapor intrusion. In this role she provides technical
review and oversight on vapor intrusion projects nationwide. Ms. Weinberg has a BS from Cornell University
and a Masters in Environmental Management from Duke University.
John H. Zimmerman, U.S. EPA ORD National Exposure Research Laboratory, Las Vegas, NV
John H. Zimmerman is a Supervisory Physical Scientist with the EPA. He received a B.A. in Chemistry and an M.S.
in Water Resource Management from the University of Nevada, Las Vegas. He has worked on research activities
focused on development, evaluation, and verification of methodologies for collection, transportation, and
analysis of VOCs in soils, water and air for over 20 years. The current focus of his research has been on VI issues
related to sampling and analysis.
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