On November 3, 2011, the Agency for Toxic Substances and Disease Registry ("ATSDR") published its 2011 Priority List of Hazardous Substances. Pursuant to Section 104(i)(2)(A) of the Comprehensive Environmental Response, Compensation, and Liability Act ("CERCLA"), ATSDR, in collaboration with EPA, is charged with developing a list of hazardous substances, in priority order, that are most commonly found at sites on the National Priorities List ("NPL") and pose the most significant potential threat to human health. The Substances Priority List consists of the hazardous substances receiving the top 275 highest scores according to ATSDR's priority calculation. ATSDR calculates a priority score for each hazardous substance that is determined to be a "candidate" for the list, based on its presence in at least one environmental media at three or more NPL sites. For 2011, the candidate list was 847 substances long.
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