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Hazard Ranking System

The HRS is a numerically based scoring system that uses information obtained primarily from the initial, limited investigations conducted at a site: the PA and SI. The HRS score is the primary criterion EPA uses to determine whether a site should be placed on the NPL.

The HRS is a screening tool and not a site specific risk assessment.

NPL listing informs the public that the site appears to present sufficient relative risk to warrant the more extensive site characterization of a remedial investigation and feasibility study (RI/FS).

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