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.