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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.
Paul S. Arell, P.E., DEE
A senior environmental engineer with EnviroGroup, Mr. Arell has over 28 years experience
managing regulatory programs at EPA, including 11 years in hazardous waste cleanup under
both RCRA and CERCLA. He was most recently head of RCRA Corrective Action at Region
VIII. He was responsible for oversight of two high profile, chlorinated solvent vapor
intrusion sites and led teams that successfully negotiated RCRA consent orders and work
plans with the owner/operators of these two sites. Mr. Arell currently participates on
EPA's vapor intrusion work group. He also participated in the development by EPA of the
RCRA environmental indicator guidance, which requires the evaluation of the indoor air
pathway. Mr. Arell has over 17 years of experience in a variety of Clean Water Act
programs.
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.
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.
Kenneth C. Scott, P.G.
Mr. Scott is the investigation Task Manager on the largest known chlorinated solvent
vapor intrusion plume in North America, including direction of hundreds of indoor
air samples and groundwater plume delineation. He has over 25 years experience in
the geological and environmental professions, including investigation and remediation
of chlorinated solvent plumes using vapor extraction systems. Mr. Scott has interfaced
with regulatory personnel and developed numerous work plans, testing procedures, and
quality control programs for both indoor air testing and groundwater investigation
programs.
David W. Kurz, P.E.
Mr. Kurz is the engineering and mitigation Task Manager on the largest known chlorinated
solvent vapor intrusion plume in North America, including mitigation of over 340
buildings including commercial, single family residential, and multi-family residential
structures. He is responsible for installation and operation of the groundwater containment
and treatment system. He has 18 years experience in environmental engineering, including
investigations and remedial design and construction for numerous sites across North
America. Mr. Kurz managed the remedial design and construction phases of a soil and
ground water cleanup project at a superfund site in Albuquerque, New Mexico, including
pilot and full-scale programs for soil vapor extraction in shallow soil and ground
water extraction, treatment, and re-injection in shallow and deep aquifers. Mr. Kurz
has authored or co-authored several papers on vapor intrusion.
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