October 4, 2016
Vapor Intrusion – Revisions to the Superfund National Priorities List – Hazard Ranking System
POSTED BYKen Kirk, P.G.
The United States Environmental Protection Agency’s (USEPA’s) final rule to add vapor intrusion to the Superfund listing criteria was submitted to the White House Office of Management and Budget for review on September 2, 2016. The rule would make vapor intrusion a component of the Hazard Ranking System (HRS) used to evaluate sites eligible for the Superfund National Priorities List (NPL). EPA’s HRS currently evaluates four exposure pathways: ground water migration, soil exposure, surface water migration, and (outdoor) air migration. The new rule would also consider both vapor intrusion and intrusion from contaminated groundwater when determining whether to add a contaminated site to the NPL.
The final review is projected to be published in the Federal Register in December 2016.