This guidance document (Federal Contaminated Site Risk Assessment in Canada, Part VII: Guidance for Soil Vapour Intrusion Assessment at Contaminated Sites) was prepared to provide guidance for federal departments.
Vapour intrusion is the migration of volatile or semi-volatile chemicals from contaminated groundwater and soil into the indoor air of buildings. This vapour intrusion guidance describes how to determine if there is the potential for subsurface vapours to migrate into a building, and if so, if vapour intrusion poses a potential unacceptable risk to human health. The guidance is written in a series of questions and steps the user can follow to evaluate the potential risks. The information in the appendices provides technical rationale for the information presented in this document.
This vapour intrusion guidance is intended to supplement the Health Canada Guidance on Human Health Preliminary Quantitative Risk Assessment (PQRA), which does not provide quantitative guidance for the soil vapour intrusion pathway.
The Federal Contaminated Sites Action Plan (FCSAP) is a program of the Government of Canada designed to ensure improved and continuing federal environmental stewardship as it relates to contaminated sites located on federally owned or operated properties.