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Dynamic Landscape of the Vapor Intrusion Pathway

Level: Advanced
Runtime: 73 minutes
Recorded Date: February 14, 2018
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  • Understanding the Vapor Intrusion Pathway
  • Cal/EPA Supplemental VI Guidance
  • Current Legal Topics 
Runtime: 1 hour and 13 minutes
Recorded: February 14, 2018


Potential human health risks resulting from the migration of subsurface contaminants to indoor air, a scenario commonly referred to as “vapor intrusion,” are common drivers for environmental site assessment, remediation, and case re-openings. Revisions to the State of California regulatory guidance for vapor intrusion studies are pending, and they may result in a significant increase in the number of projects requiring further evaluation and a substantive shift in the technical approaches applied at those facilities.

Our expert panelists will present a summary of the current theory, policy, and practice surrounding investigation, risk evaluation, and cleanup/closure decisions, as well as potential vapor intrusion litigation issues. The panel will also discuss the implications of the evolving vapor intrusion scientific and regulatory landscape. A Q&A session will follow the presentation.

This program was recorded on February 14th, 2018.

Provided By

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Dr. Chawn Jeng

Staff Toxicologist
California Department of Toxic Substances Control

Dr. Jeng is a Staff Toxicologist at the California Department of Toxic Substances Control.

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Sherry E. Jackman

Greenberg Glusker Claman & Machtinger LLP

Sherry E. Jackman is Counsel in Greenberg Glusker's Environmental Group. Her practice focuses on environmental litigation and compliance counseling.

Sherry’s professional expertise includes (1) counseling clients regarding federal and state environmental statutes and regulations, including CERCLA, RCRA, the Clean Water Act, the Clean Air Act, CEQA, Proposition 65, California Hazardous Waste Control Law, and the Endangered Species Act; (2) representing clients in state and federal litigation and administrative enforcement proceedings; and (3) counseling clients with respect to land use entitlements and permitting.

Sherry has represented a broad array of clients, including manufacturers (chemical, semiconductor, cosmetic, and food), railroads, technology companies, landfills, waste management companies, municipalities, utility companies, museums, schools, real estate developers, pharmaceutical companies, and private individuals.

Sherry is a Lecturer in Law at the USC Gould School of Law where she co-teaches “Deposition Strategies and Techniques” with Harvey Friedman.

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Robert Ettinger

Senior Principal Scientist
Geosyntec Consultants, Inc.

Robert Ettinger is a Senior Principal Environmental Scientist based in California with more than 20 years of professional experience focused on the fate and transport of contaminants in the unsaturated zone, including soil vapor extraction system design, vapor emission estimation, and subsurface contaminant vapor migration to indoor air.

Robbie has extensive experience in assessing potential subsurface vapor intrusion to indoor air associated with former and current gasoline retail and distribution, petroleum pipeline, and petrochemical manufacturing facilities. This experience includes managing human health risk assessments, designing and implementing groundwater and soil vapor remediation systems, leading negotiations with regulatory agencies on behalf of individual companies, and developing risk-based strategies for corporate environmental liability and business management initiatives.

His contributions to advancing the state of the practice began with his co-authorship of the Johnson and Ettinger (1991) algorithm for evaluating subsurface contaminant vapor intrusion to indoor air. During the past 15 years, additional contributions have been made through field investigations and modeling evaluations on subsurface contaminant vapor intrusion to indoor air. His work is widely cited by regulators and industry groups as the reference point for beginning vapor intrusion assessments. Robbie has published numerous articles on chemical vapor intrusion, environmental fate of volatile chemicals, and design considerations for groundwater and soil vapor extraction systems.

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Ravi Arulanantham, Ph.D.

Senior Principal Consultant
Geosyntec Consultants

Ravi Arulanantham is a Senior Principal Consultant based in California with more than 20 years of experience focused on risk assessment and remediation management. He is recognized as a leader in applying risk-based decision-making to the development of remediation strategies for environmentally impacted sites.

As the first staff toxicologist for the California Regional Water Quality Control Boards, he provided expertise and leadership in expanding the application of risk assessment and risk management to the areas of policy development, case review, and staff training. From 1993 to present, he has been the principal instructor for Cal-EPA/SWRCB-sponsored training courses on risk-based decision making at petroleum-impacted sites. These courses have attracted more than 2,000 regulators, consultants, and responsible parties throughout the state, significantly affecting the movement of consultants and regulators toward accepting risk based findings as a component of decision making and site closure.

Ravi is among the few ASTM-certified national trainers for both the Risk-Based Corrective Action (RBCA) program and the Remediation by Natural Attenuation (RNA) standard and has trained over 1000 regulators, consultants, and responsible parties in more than 20 states. He has given numerous invited lectures on risk-based decision making to a wide range of audiences and is nationally acknowledged as an expert on this subject.

Since joining the private sector in 2002, he has been helping his industry clients find cost-effective business solutions to their environmental liabilities. He is very well known in his field for his abilities to develop and implement investigation, remediation, risk management strategies for contaminated properties and negotiate risk-based closures with regulatory agencies to obtain No Further Action letters for his clients.

He has served as an expert witness for numerous litigation matters ranging from chlorinated solvent releases and indoor air impacts, human exposure to petroleum releases, adequacy of site investigation and remediation conducted to protect human health, classification and disposal of hazardous waste, proper application of cleanup levels and achieving cleanup levels at contaminated sites.

Ravi Arulanantham was a Fulbright scholar at the University of California at Berkeley where he received his masters and doctorate in physiology and biochemistry in 1988.

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