David J. Folkes, P.E.
Mr. Folkes is the Project Director for the largest solvent vapor intrusion project in
North America, including mitigation of over 340 residences impacted by chlorinated
solvent vapors and indoor air testing of nearly 700 homes. An invited speaker at
EPA's national RCRA convention in 2000 and 2002, he has provided federal and state
regulators with practical experience on vapor intrusion testing, mitigation, and
community interaction issues. Areas of research include background or indoor sources
of solvents in air, which can be mistaken for vapor intrusion, and groundwater to indoor
air correlations. With over 24 years experience in environmental consulting, Mr. Folkes
has investigated and remediated a wide variety of industrial and natural resources sites
with organic, petroleum, and metals impacts. He has published and presented papers on
numerous environmental topics, including groundwater and vapor intrusion remediation,
and served as an expert witness in both state and federal court, including testimony in
three class action lawsuits.
Jeffrey P. Kurtz, Ph.D.
Dr. Kurtz has degrees in chemistry, geochemistry, and geology, and specializes in
statistical evaluation of contaminant data, including roles as the statistician and
advisor for sampling of chlorinated solvent impacted indoor air and groundwater at
several major vapor intrusion sites in metropolitan Denver. He was responsible
for: method development for indoor air COC selection; DQOs and sampling plans to
define background air concentrations and the spatial extent of indoor air contamination;
geostatistical mapping of indoor air contamination; defining groundwater to indoor air
correlations for determination of preliminary remediation goals for groundwater;
developing methods for identification of non-groundwater derived chlorinated solvents
in indoor air; developing statistically based post-remediation monitoring plans
using surrogates; uncertainty characterization in the risk assessment; writing
significant portions of indoor air reports and the indoor air corrective measures plan;
presentations to the Colorado Department of Public Health and Environment and the U.S. EPA.
He has authored or co-authored several papers on vapor intrusion.
Bill Morris
Mr. Morris served as the Kansas Department of
Health and Environment’s expert on vapor intrusion overseeing all department
vapor intrusion activities on a wide range of sites across the state.
This includes performing oversight on vapor intrusion related sampling activities at 35 sites
and on installation of over 100 mitigation systems. Mr. Morris served as
co-lead of the Interstate Technology and Regulatory Council's vapor intrusion team
participating in development of the 2007 vapor intrusion guidance and serving as a classroom
training instructor on that guidance. Mr. Morris has 20 years of experience in the
environmental field including serving 15 years as a state regulator, managing the
underground storage tank program, serving as a quality assurance officer, and working in an
environmental laboratory. Mr. Morris served on the ASTM committee which developed the E2600-08
Standard Practice for Assessment of Vapor Intrusion into Structures on Property Involved in Real Estate
Transactions. Mr. Morris has prepared several papers and given numerous presentations on vapor intrusion.
James B. Cowart, P.E.
Mr. Cowart is a Professional Engineer with over 35 years experience in environmental consulting.
Mr. Cowart is considered an expert in vapor intrusion mitigation, having managed two of the largest
projects in the nation: Headquarters CDOT, Denver and River Point at Sheridan, Colorado. Mr. Cowart
is Project Director for the Voluntary Cleanup (VCUP) and redevelopment of a 130 acre former landfill in
Sheridan, Colorado. A Vapor Mitigation Plan for this site was prepared by Mr. Cowart and approved by the Colorado
Department of Public Health and Environment in 2006. Vapor assessment and mitigation of $4 to $6 million are being
performed for 800,000 square feet of commercial buildings, including Target and Costco, as well as parking lots
and utilities, in order to protect public health and safety from explosive levels of methane and other toxic gases.
Mr. Cowart was Program Manager from 1997-2001 for the first large, complex vapor intrusion related hazardous waste
investigation and remediation in the U.S. at the CDOT Headquarters in Denver, Colorado. Leaking underground storage
tanks on-site contaminated groundwater with solvents, which in turn led to air quality impacts to 750 occupants of
apartment buildings and single family residences above the groundwater plume. For this project, Mr. Cowart directed
a RCRA Facilities Investigation, an Interim Measures Action consisting of soil vapor extraction at 30 structures,
a Baseline Risk Assessment which established Preliminary Remediation Goals, a Long Term Corrective Measures Plan,
and an Operations & Maintenance and Monitoring program which provides for more than $20 million for treatment of
indoor air over the next 20 years. Mr. Cowart has served as an expert in deposition or testimony for three vapor
intrusion cases.
Susan B. Welt, MPH, P.E.
Ms. Welt is a registered professional engineer with an MS in environmental engineering from Cornell,
an MPH from the Rochester School of Medicine, and over 11 years experience in environmental consulting and
regulatory work. She is also a Fellow of the Centers for Disease Control and Prevention Environmental
Public Health Leadership Institute.
She served as a vapor intrusion expert with the New York State Department of Health overseeing major
industrial and residential vapor intrusion sites in the state, commenting on regulatory guidance documents,
and serving on the interagency petroleum soil vapor intrusion workgroup. Prior to that, she developed the
vapor intrusion investigation and mitigation services for a major environmental consulting firm in New York.
In this role, she oversaw and reviewed all soil vapor intrusion assessment and mitigation approaches
implemented at hundreds of sites contaminated with both chlorinated and petroleum-based volatile organic
compounds in commercial and residential settings in the United States and internationally. Ms. Welt
is a former member of the ITRC vapor intrusion team, assisting with the development of the ITRC vapor
intrusion guidance document, and has also authored numerous papers and given presentations on a variety
of topics including vapor intrusion sampling, assessment, and engineering mitigation techniques.
Eric Lovenduski
Mr. Lovenduski is a geologist and project manager with EnviroGroup. He has nine years
of experience in environmental consulting with a focus on vapor intrusion investigations,
remedial investigations, hydrogeology, and indoor air testing. Mr. Lovenduski's experience
includes development, implementation, and the successful completion of soil vapor investigations
in accordance with regulatory requirements across the US, including office and industrial
facilities in New York, New Jersey, Colorado and Tennessee. Mr. Lovenduski regularly coordinates
all aspect of vapor intrusion activities including working with clients to identify the specific
goals of their project, work plan development, permitting, hiring/oversight of sub-contractors,
and interaction with regulatory agencies, as well as business and community representatives.
Mr. Lovenduski also has experience in completing Phase I Environmental Site Assessments (ESAs)
in accordance with USEPA's All Appropriate Inquiry/ASTM E1527-05 requirements, and is currently
a member of the ASTM task group responsible for development and any revisions to the E2600-08,
the new standard for evaluating vapor intrusion at properties involved in real estate transactions.
Garry J. Stanley
Mr. Stanley, an EnviroGroup project manager and hydrogeologist, has over 10 years of experience
with a focus on vapor intrusion surveys, soil vapor and indoor air testing, and related site investigations.
His experience includes development and implementation of major soil vapor and indoor air investigations in
accordance with regulatory requirements at facilities in Colorado, New York, and other states. In addition
to his project experience, Mr. Stanley has completed the ITRC 2 day vapor intrusion class and is familiar
with modern day vapor intrusion guidance requirements. Mr. Stanley regularly coordinates all aspects of
vapor intrusion investigation activities including working with clients to identify the specific goals of
their project, work plan development, permitting, hiring/oversight of sub-contractors, installation and
sampling of active sampling devices, and interaction with regulatory agencies, as well as business and
community representatives.
Lisa A. Sigler, APR
Ms. Sigler is a senior-level community relations expert who helps companies meet their
business and technical goals through successful communications and public involvement.
During her 17 years in the communications business, she has developed dozens of community
involvement plans and programs on Superfund and RCRA sites. Ms. Sigler currently manages
community relations on a number of U.S. and Canadian vapor intrusion sites including
the largest known chlorinated solvent plume in the U.S. She was invited to speak
at the 2002 EPA RCRA conference highlighting community involvement success stories
at two vapor intrusion sites. She has expertise communicating with a wide variety
of stakeholders, including multi-ethnic communities, civic and community leaders,
elected officials, regulators, news media, and residents. Ms. Sigler has been involved
in creating specific strategies and tools to successfully address concerns about health
and real estate issues, two major issues on vapor intrusions sites involving residential
communities.
Stephen J. Foster, Ph.D.
Dr. Foster is a risk assessment professional, and contract consultant to EnviroGroup, with
over 25 years experience in environmental consulting for both industrial clients and State agencies.
Dr. Foster is considered an expert in all aspects of vapor intrusion risk assessment including:
the preparation of work plans; data quality objectives; data evaluation; risk calculations; and
the toxicology of the volatile organic chemicals common in vapor intrusion. He has used his education
in chemistry and toxicology to manage and conduct human health risk assessments at a number of large
vapor intrusion sites across the country including the CDOT-Material Testing Laboratory in Denver.
As part of this management process, Dr. Foster has directed indoor air data collection efforts at a
number of sites where continuous and on-going interaction with the lead regulatory agency has been required.
Dr. Foster is an expert in the toxicology of many of the volatile chemicals including trichloroethene,
perchloroethene and 1,1-dichloroethene, and on background indoor air chemicals. He has conducted public
meetings related to vapor intrusion and has prepared community relations plans and risk communication
documents for a number of sites. Dr. Foster has been working on vapor intrusion sites since 1989.
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