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Assessment Phase

Vapor Intrusion

Vapor intrusion occurs due to the migration of vapor-forming chemicals from any subsurface source into an overlying building.

Petroleum Vapor Intrusion (PVI-1)
Section 2 (Introduction)

VI occurs when vapors from contaminated groundwater or other subsurface sources migrate upward through vadose zone soils and into overlying buildings.

Vapor Intrusion (VI-1)
Section 1.6.3 (Preferential Pathways)

Discussion about vapor intrusion pathways and the permeability of subsurface materials.