Addition of a Subsurface Intrusion Component to the Hazard Ranking System

The US EPA is working toward a proposed rule to add a new screening component (subsurface intrusion (SSI) component) to the Hazard Ranking System (HRS) that would allow sites with vapor intrusion contamination to be evaluated for placement on the National Priorities List (NPL).

The subsurface intrusion component would expand the number of available options for EPA and state and tribal organizations performing work on behalf of EPA to ...

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