National Priorities List

SUPPLEMENTARY INFORMATION:

Table of Contents

I. Background

A. What are CERCLA and SARA?

B. What is the NCP?

C. What is the National Priorities List (NPL)?

D. How are sites listed on the NPL?

E. What happens to sites on the NPL?

F. Does the NPL define the boundaries of sites?

G. How are sites removed from the NPL?

H. May the EPA delete portions of sites from the NPL as they are cleaned up?

I. What is the Construction Completion List (CCL)?

J. What is the Sitewide Ready for Anticipated Use measure?

K. What is State/Tribal correspondence concerning NPL Listing?

II. Availability of Information to the Public

A. May I review the documents relevant to this final rule?

B. What documents are available for review at the EPA Headquarters docket?

C. What documents are available for review at the EPA regional dockets?

D. How do I access the documents?

E. How may I obtain a current list of NPL sites?

III. Contents of This Final Rule

A. Additions to the NPL

B. What did the EPA do with the public comments it received?

IV. Statutory and Executive Order Reviews

A. Executive Order 12866: Regulatory Planning and Review and Executive Order 13563: Improving Regulation and Regulatory Review

B. Paperwork Reduction Act (PRA)

C. Regulatory Flexibility Act (RFA)

D. Unfunded Mandates Reform Act (UMRA)

E. Executive Order 13132: Federalism

F. Executive Order 13175: Consultation and Coordination With Indian Tribal Governments

G. Executive Order 13045: Protection of Children From Environmental Health and Safety Risks

H. Executive Order 13211: Actions That Significantly Affect Energy Supply, Distribution, or Use

I. National Technology Transfer and Advancement Act (NTTAA)

J. Executive Order 12898: Federal Actions To Address Environmental Justice in Minority Populations and Low-Income Populations

K. Congressional Review Act

I. Background

A. What are CERCLA and SARA?

In 1980, Congress enacted the Comprehensive Environmental Response, Compensation, and Liability Act, 42 U.S.C. 9601-9675 (“CERCLA” or “the Act”), in response to the dangers of uncontrolled releases or threatened releases of hazardous substances, and releases or substantial threats of releases into the environment of any pollutant or contaminant that may present an imminent or substantial danger to the public health or welfare. CERCLA was amended on October 17, 1986, by the Superfund Amendments and Reauthorization Act (“SARA”), Public Law 99-499, 100 Stat. 1613 et seq.

B. What is the NCP?

To implement CERCLA, the EPA promulgated the revised National Oil and Hazardous Substances Pollution Contingency Plan (“NCP”), 40 CFR part 300, on July 16, 1982 (47 FR 31180), pursuant to CERCLA section 105 and Executive Order 12316 (46 FR 42237, August 20, 1981). The NCP sets guidelines and procedures for responding to releases and threatened releases of hazardous substances, or releases or substantial threats of releases into the environment of any pollutant or contaminant that may present an imminent or substantial danger to the public health or welfare. The EPA has revised the NCP on several occasions. The most recent comprehensive revision was on March 8, 1990 (55 FR 8666).

As required under section 105(a)(8)(A) of CERCLA, the NCP also includes “criteria for determining priorities among releases or threatened releases throughout the United States for the purpose of taking remedial action and, to the extent practicable, taking into account the potential urgency of such action, for the purpose of taking removal action.” “Removal” actions are defined broadly and include a wide range of actions taken to study, clean up, prevent or otherwise address releases and threatened releases of hazardous substances, pollutants or contaminants (42 U.S.C. 9601(23)).

C. What is the National Priorities List (NPL)?

The NPL is a list of national priorities among the known or threatened releases of hazardous substances, pollutants or contaminants throughout the United States. The list, which is appendix B of the NCP (40 CFR part 300), was required under section 105(a)(8)(B) of CERCLA, as amended. Section 105(a)(8)(B) defines the NPL as a list of “releases” and the highest priority “facilities” and requires that the NPL be revised at least annually. The NPL is intended primarily to guide the EPA in determining which sites warrant further investigation to assess the nature and extent of public health and environmental risks associated with a release of hazardous substances, pollutants or contaminants. The NPL is of only limited significance, however, as it does not assign liability to any party or to the owner of any specific property. Also, placing a site on the NPL does not mean that any remedial or removal action necessarily need be taken.

For purposes of listing, the NPL includes two sections, one of sites that are generally evaluated and cleaned up by the EPA (the “General Superfund section”) and one of sites that are owned or operated by other Federal agencies (the “Federal Facilities section”). With respect to sites in the Federal Facilities section, these sites are generally being addressed by other Federal agencies. Under Executive Order 12580 (52 FR 2923, January 29, 1987) and CERCLA section 120, each Federal agency is responsible for carrying out most response actions at facilities under its own jurisdiction, custody or control, although the EPA is responsible for preparing a Hazard Ranking System (“HRS”) score and determining whether the facility is placed on the NPL.

D. How are sites listed on the NPL?

There are three mechanisms for placing sites on the NPL for possible remedial action (see 40 CFR 300.425(c) of the NCP): (1) A site may be included on the NPL if it scores sufficiently high on the HRS, which the EPA promulgated as appendix A of the NCP (40 CFR part 300). The HRS serves as a screening tool to evaluate the relative potential of uncontrolled hazardous substances, pollutants or contaminants to pose a threat to human health or the environment. On December 14, 1990 (55 FR 51532), the EPA promulgated revisions to the HRS partly in response to CERCLA section 105(c), added by SARA. On January 9, 2017 (82 FR 2760), a subsurface intrusion component was added to the HRS to enable the EPA to consider human exposure to hazardous substances or pollutants and contaminants that enter regularly occupied structures through subsurface intrusion when evaluating sites for the NPL. The current HRS evaluates four pathways: ground water, surface water, soil exposure and subsurface intrusion, and air. As a matter of agency policy, those sites that score 28.50 or greater on the HRS are eligible for the NPL. (2) Each State may designate a single site as its top priority to be listed on the NPL, without any HRS score. This provision of CERCLA requires that, to the extent practicable, the NPL include one facility designated by each State as the greatest danger to public health, welfare or the environment among known facilities in the State. This mechanism for listing is set out in the NCP at 40 CFR 300.425(c)(2). (3) The third mechanism for listing, included in the NCP at 40 CFR 300.425(c)(3), allows certain sites to be listed without any HRS score, if all of the following conditions are met:

• The Agency for Toxic Substances and Disease Registry (ATSDR) of the U.S. Public Health Service has issued a health advisory that recommends dissociation of individuals from the release.
• The EPA determines that the release poses a significant threat to public health.
• The EPA anticipates that it will be more cost-effective to use its remedial authority than to use its removal authority to respond to the release.

The EPA promulgated an original NPL of 406 sites on September 8, 1983 (48 FR 40658) and generally has updated it at least annually.

E. What happens to sites on the NPL?

A site may undergo remedial action financed by the Trust Fund established under CERCLA (commonly referred to as the “Superfund”) only after it is placed on the NPL, as provided in the NCP at 40 CFR 300.425(b)(1). (“Remedial actions” are those “consistent with a permanent remedy, taken instead of or in addition to removal actions” (40 CFR 300.5).) However, under 40 CFR 300.425(b)(2), placing a site on the NPL “does not imply that monies will be expended.” The EPA may pursue other appropriate authorities to respond to the releases, including enforcement action under CERCLA and other laws.

F. Does the NPL define the boundaries of sites?

The NPL does not describe releases in precise geographical terms; it would be neither feasible nor consistent with the limited purpose of the NPL (to identify releases that are priorities for further evaluation), for it to do so. Indeed, the precise nature and extent of the site are typically not known at the time of listing.

Although a CERCLA “facility” is broadly defined to include any area where a hazardous substance has “come to be located” (CERCLA section 101(9)), the listing process itself is not intended to define or reflect the boundaries of such facilities or releases. Of course, HRS data (if the HRS is used to list a site) upon which the NPL placement was based will, to some extent, describe the release(s) at issue. That is, the NPL site would include all releases evaluated as part of that HRS analysis.

When a site is listed, the approach generally used to describe the relevant release(s) is to delineate a geographical area (usually the area within an installation or plant boundaries) and identify the site by reference to that area. However, the NPL site is not necessarily coextensive with the boundaries of the installation or plant, and the boundaries of the installation or plant are not necessarily the “boundaries” of the site. Rather, the site consists of all contaminated areas within the area used to identify the site, as well as any other location where that contamination has come to be located, or from where that contamination came.

In other words, while geographic terms are often used to designate the site ( e.g., the “Jones Co. Plant site”) in terms of the property owned by a particular party, the site, properly understood, is not limited to that property ( e.g., it may extend beyond the property due to contaminant migration), and conversely may not occupy the full extent of the property ( e.g., where there are uncontaminated parts of the identified property, they may not be, strictly speaking, part of the “site”). The “site” is thus neither equal to, nor confined by, the boundaries of any specific property that may give the site its name, and the name itself should not be read to imply that this site is coextensive with the entire area within the property boundary of the installation or plant. In addition, the site name is merely used to help identify the geographic location of the contamination; and is not meant to constitute any determination of liability at a site. For example, the name “Jones Co. plant site,” does not imply that the Jones Company is responsible for the contamination located on the plant site.

EPA regulations provide that the remedial investigation (“RI”) “is a process undertaken . . . to determine the nature and extent of the problem presented by the release” as more information is developed on site contamination, and which is generally performed in an interactive fashion with the feasibility study (“FS”) (40 CFR 300.5). During the RI/FS process, the release may be found to be larger or smaller than was originally thought, as more is learned about the source(s) and the migration of the contamination. However, the HRS inquiry focuses on an evaluation of the threat posed and therefore the boundaries of the release need not be exactly defined. Moreover, it generally is impossible to discover the full extent of where the contamination “has come to be located” before all necessary studies and remedial work are completed at a site. Indeed, the known boundaries of the contamination can be expected to change over time. Thus, in most cases, it may be impossible to describe the boundaries of a release with absolute certainty.

Further, as noted previously, NPL listing does not assign liability to any party or to the owner of any specific property. Thus, if a party does not believe it is liable for releases on discrete parcels of property, it can submit supporting information to the agency at any time after it receives notice it is a potentially responsible party.

For these reasons, the NPL need not be amended as further research reveals more information about the location of the contamination or release.

G. How are sites removed from the NPL?

The EPA may delete sites from the NPL where no further response is appropriate under Superfund, as explained in the NCP at 40 CFR 300.425(e). This section also provides that the EPA shall consult with States on proposed deletions and shall consider whether any of the following criteria have been met:

(i) Responsible parties or other persons have implemented all appropriate response actions required;

(ii) All appropriate Superfund-financed response has been implemented and no further response action is required; or

(iii) The remedial investigation has shown the release poses no significant threat to public health or the environment and taking of remedial measures is not appropriate.

H. May the EPA delete portions of sites from the NPL as they are cleaned up?

In November 1995, the EPA initiated a policy to delete portions of NPL sites where cleanup is complete (60 FR 55465, November 1, 1995). Total site cleanup may take many years, while portions of the site may have been cleaned up and made available for productive use.

I. What is the Construction Completion List (CCL)?

The EPA also has developed an NPL construction completion list (“CCL”) to simplify its system of categorizing sites and to better communicate the successful completion of cleanup activities (58 FR 12142, March 2, 1993). Inclusion of a site on the CCL has no legal significance.

Sites qualify for the CCL when: (1) Any necessary physical construction is complete, whether or not final cleanup levels or other requirements have been achieved; (2) the EPA has determined that the response action should be limited to measures that do not involve construction ( e.g., institutional controls); or (3) the site qualifies for deletion from the NPL. For more information on the CCL, see the EPA's internet site at https://www.epa.gov/superfund/construction-completions-national-priorities-list-npl-sites-number.

J. What is the Sitewide Ready for Anticipated Use measure?

The Sitewide Ready for Anticipated Use measure represents important Superfund accomplishments, and the measure reflects the high priority the EPA places on considering anticipated future land use as part of the remedy selection process. See Guidance for Implementing the Sitewide Ready-for-Reuse Measure, May 24, 2006, OSWER 9365.0-36. This measure applies to final and deleted sites where construction is complete, all cleanup goals have been achieved, and all institutional or other controls are in place. The EPA has been successful on many occasions in carrying out remedial actions that ensure protectiveness of human health and the environment for current and future land uses, in a manner that allows contaminated properties to be restored to environmental and economic vitality. For further information, please go to https://www.epa.gov/superfund/about-superfund-cleanup-process#reuse.

K. What is State/Tribal correspondence concerning NPL listing?

In order to maintain close coordination with States and Tribes in the NPL listing decision process, the EPA's policy is to determine the position of the States and Tribes regarding sites that the EPA is considering for listing. This consultation process is outlined in two memoranda that can be found at the following website: https://www.epa.gov/superfund/statetribal-correspondence-concerning-npl-site-listing.

The EPA has improved the transparency of the process by which State and Tribal input is solicited. The EPA is using the Web and where appropriate more structured State and Tribal correspondence that: (1) Explains the concerns at the site and the EPA's rationale for proceeding; (2) requests an explanation of how the State intends to address the site if placement on the NPL is not favored; and (3) emphasizes the transparent nature of the process by informing States that information on their responses will be publicly available.

A model letter and correspondence between the EPA and States and Tribes where applicable, is available on the EPA's website at https://www.epa.gov/superfund/Statetribal-correspondence-concerning-npl-site-listing.

II. Availability of Information to the Public

A. May I review the documents relevant to this final rule?

Yes, documents relating to the evaluation and scoring of the site in this final rule are contained in dockets located both at the EPA headquarters and in the EPA regional offices.

An electronic version of the public docket is available through https://www.regulations.gov (see table below for docket identification numbers). Although not all docket materials may be available electronically, you may still access any of the publicly available docket materials through the docket facilities identified in section II.D.