The Citizen's Guide series is a set of 22 fact sheets that summarizes cleanup methods used at Superfund and other sites. This guide describes how vapor intrusion is the movement of chemical vapors from contaminated soil and groundwater into nearby buildings.
Vapors primarily enter through openings in the building foundation or basement walls ─ such as cracks in the concrete slab, gaps around utility lines, and sumps.

• A Citizen's Guide to Vapor Intrustion Mitigation (PDF)(2 pp, 2 MB, 2012, 542-F-12-021)