Course Description

Course ID: 
Continuing Education Units: 

This course provides an overview of the vapor intrusion exposure pathway including its scientific foundation, regulatory framework, and the technical aspects of investigating and remediating contaminated vapor sites. The class will cover topics such as: screening sites for potential vapor intrusion concerns, conducting field investigations, sampling techniques, data analyses, exposure point calculations, the Johnson and Ettinger predictive model, vapor intrusion risk assessment, vapor intrusion mitigation, and remediation. Participants will work through practical problems and typical site scenarios based on case studies of established vapor intrusion sites. This course provides a comprehensive introduction for those new to the field, and will also provide insights, data analysis techniques, and the latest research for more advanced participants.

"This course was very organized and interesting...gave real life case studies that helped me understand the topics that were taught throughout the course." K. Erney, February 2013

"Thorough.  The instructor included references to local (state) guidance and its divergence from other VI guidance." C. Grover, February 2013

"I really liked how the instructor used state specific guidance and compared it to other states' + EPA guidance...the case studies were great - really illustrated the content of the course." R. Ridenour, February 2013

"The instructor is knowledgeable and very willing to engage students." D. Hammer, February 2013

"His extensive real world experience gave confidence in his knowledge." R. Timmins, August 2013

"Very good course overall very helpful as an introduction to VI.  Instructor very knowledgable and explained content in a very clear way." L. Galu, August 2013


*Reduced tuition is available to employees of Native American tribes, government agencies, nonprofits, students and NAEP members.

If you have any difficulties or questions regarding registration please call 425-270-3274 ext 103.

Please wait to receive a course confirmation email, roughly one month prior to the class, before making any travel arrangements.


Basic math skills and a general understanding of contaminated sites.

Course Materials: 

*Registered attendees will receive a PDF copy of course materials prior to the class. A physical book can be purchased for an additional $50 charge. To purchase, select "Physical Book" above.

Intended Audience: 

Environmental professionals seeking an improved understanding of vapor migration and intrusion with an emphasis on vapor assessment and modeling. The material is intended for practitioners working on remediation of hazardous substance release sites and brownfields redevelopment.

Cancelation Policy: 

Once your order has been placed, you are subject to our cancellation policy regardless of the status of your invoice.

  • 31 days prior to training -> 100% refund
  • 30-16 days prior to training -> 50% refund
  • 15 - start of course -> No refund available

Attendee replacement acceptable at anytime.Course registration fees and cancellation policy are subject to change without notice.

More Information

Course Topics

  1. Introduction

Overview and Definitions

  • Defining “volatile chemicals”
  • Migration pathways

Vapor Migration Issues

  • Human health risks
  • Universal nature of pathway
  • Mitigation/Remediation
  • Future property development/brownfields redevelopment 

Vapor Chemistry

  • 3 and 4 phase chemical partitioning
  • Partitioning as predicted by: Henry’s law, vapor pressure, and Raoult’s law

Vapor Physics

  • Diffusion
  • Fick’s law
  • Advection


  • Soils
  • Vapor permeability
  • Heterogeneities
  • Porosity (total, air-filled/water-filled)
  • Perched water
  • Preferential vapor migration


  • Chlorinated VOCs
  • Petroleum hydrocarbons 

Building Design Issues

  • Foundation types
  • Space partitioning
  • HVAC systems

Regulatory Framework:

  • ITRC guidance
  • DTSC guidance & CHHSLs

Vapor Intrusion Investigations

  • Sampling techniques for groundwater, soil, subslab, and indoor air
  • Depth discrete
  • Temporary vs. permanent monitoring points
  • Analytical methods
  • Spatial temporal variability
  • Limitations
  • Correlation to indoor levels

Data Analysis and Interpretation

  • 90/95% UCLs
  • Using means
  • Partitioned buildings
  • Separation of ventilation systems 

Johnson and Ettinger Model

  • Types
  • Data needs
  • Parameter sensitivities
  • Accuracy
  • Value
  • Problems and limitations
  • Guidance

Case Studies

Vapor Mitigation Systems and Engineered Controls

  • Modified HVAC systems
  • Air treatment
  • Sub-slab depressurization (types, performance/reliability)
  • Vapor barriers (types, specifications)
  • Combination systems

Vapor Remediation

  • Source-zone treatment
  • SVE systems
  • Dual-phase
  • Demonstrating compliance
  • Off-gas treatment

Institutional Controls

  • Government controls
  • Propietary controls
  • Enforcement tools with IC components
  • Informational devices
  • Monitoring of ICs 

New Developments in Vapor Intrusion

  • Future of Johnson and Ettinger model
  • EPA databases
  • Correlation levels
  • Empirical vs. theoretical results
  • HVOCs vs. petroleum
  • EPA guidance and use of generic attenuation factors
  • Other vapor guidance


What to Bring

Please bring a pen or pencil, and notepad if you would like to take notes (you may also choose to take notes in your book). 

Billing Information

In order to guarantee a space in a course, the tuition must be paid in full TWO WEEKS before the first day of the course by either check or credit card. State and government agencies paying with a purchase order are allowed payment under the two-week time frame if a copy of the purchase order is received by NWETC.

If You Need to Cancel


  • With 31 or more days notice, we will offer a 100% refund or credit towards a future course. The credit is good for one year and may be applied to any course.
  • With 30-8 days notice, we will offer a course credit towards a future course. The credit is good for one year and may be applied to any course.
  • With fewer than 8 days notice, there is no course credit available

*Please note that attendee replacement is welcome at any time

Disability Accommodations

Disability Accommodations:

No upcoming offerings

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