George Colvin—An Introduction to the Vapor Intrusion (VI) Pathway
George Colvin is a Principal Scientist and co-founder of the environmental consulting firm Cox-Colvin & Associates, Inc. He has over 30 years of consulting experience focusing on the investigation and cleanup of operating and former industrial and waste management sites in Ohio and the Mid-West. He holds a BS in Geology from Ohio University and MS in geology and hydrology from Vanderbilt University. He is a certified professional geologist with the American Association of Professional Geologist, a registered geologist in the states of Kentucky, Pennsylvania, and Tennessee, and a Certified Hazardous Materials Manager.
Vapor intrusion (VI) is the migration of vapor-forming chemicals from any subsurface source, such as contaminated soil or groundwater, into indoor air space. Contamination of soil and/or groundwater by vapor-forming chemicals such as chlorinated solvents and petroleum hydrocarbons is common at current and former industrial and commercial areas. In extreme cases, the vapors may accumulate in dwelling or occupied buildings to levels that may pose near-term safety hazards (e.g., explosion) and/or acute health effects. In buildings with lower concentrations of vapor-forming chemicals arising from VI, the chemicals may pose an unacceptable risk of health effects due to long-term (i.e. chronic) exposure, with EPA and state-defined acceptable VI indoor air concentrations often being several orders of magnitude less than comparable OSHA standards. This presentation will provide an introduction to this relevant and rapidly evolving exposure pathway, from the perspective of both safety and environmental professionals.
Presenters: George Colvin, Cox-Colvin and Associates, Inc.