Vapor intrusion is an exposure pathway where volatile or gaseous
chemicals in subsurface soil or groundwater can enter indoor air. Volatile
chemicals may be released into the environment and then seep into the soil and
into groundwater. Other vapors or gases may be released by naturally-occurring
chemical and physical processes in the subsurface environment. These vapors or
gases travel through unsaturated soil seeking the atmosphere; however,
buildings with sump pits or cracks their foundations may offer a path of lower
resistance for these substances. As a result, elevated levels of these vapors
or gases may be present in affected buildings.This presentation will share case studies that have unique and interesting features, including gasoline vapor intrusion and the intrusion of carbon dioxide into homes. Attendees will have the opportunity to discuss and speculate on environmental conditions that produce sources of vapor intrusion.
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