[Federal Register: December 7, 2005 (Volume 70, Number 234)]
[Notices]
[Page 72840-72842]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr07de05-92]
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DEPARTMENT OF HEALTH AND HUMAN SERVICES
Agency for Toxic Substances and Disease Registry
[ATSDR-217]
Notice of the Revised Priority List of Hazardous Substances That
Will Be the Subject of Toxicological Profiles
AGENCY: Agency for Toxic Substances and Disease Registry (ATSDR), U.S.
Department of Health and Human Services (HHS).
ACTION: Notice.
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SUMMARY: The Comprehensive Environmental Response, Compensation, and
Liability Act (CERCLA or Superfund), as amended by the Superfund
Amendments and Reauthorization Act (SARA), requires that ATSDR and the
Environmental Protection Agency (EPA) revise the Priority List of
Hazardous Substances. This list includes substances most commonly found
at facilities on the CERCLA National Priorities List (NPL) which have
been determined to be of greatest concern to public health at or around
these NPL hazardous waste sites. This announcement provides notice that
the agencies have developed and are making available a revised CERCLA
Priority List of 275 Hazardous Substances, based on the most recent
information available. Each substance on the priority list is a
candidate to become the subject of a toxicological profile prepared by
ATSDR and
[[Page 72841]]
subsequently a candidate for the identification of priority data needs.
In addition to the Priority List of Hazardous Substances, ATSDR has
developed a Completed Exposure Pathway Site Count Report. This report
lists the number of sites or events with ATSDR activities where a
substance has been found in a completed exposure pathway (CEP). This
report is included in the Support Document of the Priority List.
ADDRESSES: Requests for a printed copy of the report, the 2005 CERCLA
Priority List of Hazardous Substances That Will Be The Subject of
Toxicological Profiles and Support Document, including the CEP report,
should bear the docket control number ATSDR-217, and should be
submitted to: Ms. Olga Dawkins, Division of Toxicology and
Environmental Medicine, Mail Stop F-32, 1600 Clifton Road, NE.,
Atlanta, GA 30333. Requests must be in writing.
Electronic Availability: The 2005 Priority List of Hazardous
Substances and Support Document will be posted on ATSDR's Web site
located at http://www.atsdr.cdc.gov/clist.html The CEP Report will also be posted at http://www.atsdr.cdc.gov/cep.html.
This is an informational notice only, and comments are not being
solicited at this time. However, any comments received will be
considered for inclusion in the next revision of the list and placed in
a publicly accessible docket; therefore, please do not submit
confidential business or other confidential information.
FOR FURTHER INFORMATION CONTACT: ATSDR, Division of Toxicology and
Environmental Medicine, 1600 Clifton Road, NE., Mail Stop F-32,
Atlanta, GA 30333, telephone 888-422-8737.
SUPPLEMENTARY INFORMATION: CERCLA establishes certain requirements for
ATSDR and EPA with regard to hazardous substances that are most
commonly found at facilities on the CERCLA NPL. Section 104(i)(2) of
CERCLA, as amended [42 U.S.C. 9604(i)(2)], required that the two
agencies prepare a list, in order of priority, of at least 100
hazardous substances that are most commonly found at facilities on the
NPL and which, in their sole discretion, have been determined to pose
the most significant potential threat to human health (see 52 FR 12866,
April 17, 1987). CERCLA also required the agencies to revise the
priority list to include 100 or more additional hazardous substances
(see 53 FR 41280, October 20, 1988), and to include at least 25
additional hazardous substances in each of the three successive years
following the 1988 revision (see 54 FR 43619, October 26, 1989; 55 FR
42067, October 17, 1990; 56 FR 52166, October 17, 1991). CERCLA also
requires that ATSDR and EPA shall, at least annually thereafter, revise
the list to include additional hazardous substances that have been
determined to pose the most significant potential threat to human
health. In 1995, the agencies altered the publication schedule of the
priority list by moving to a 2-year publication schedule, reflecting
the stability of this listing activity (60 FR 16478, March 30, 1995).
As a result, the priority list is now on a 2-year publication schedule
with a yearly informal review and revision. Each substance on the
CERCLA Priority List of Hazardous Substances is a candidate to become
the subject of a toxicological profile prepared by ATSDR and
subsequently a candidate for the identification of priority data needs.
The initial priority lists of hazardous substances (1987-1990) were
based on the most comprehensive and relevant information available when
the lists were developed. More comprehensive sources of information on
the frequency of occurrence and the potential for human exposure to
substances at NPL sites became available for use in the 1991 priority
list with the development of ATSDR's HazDat database. Utilizing this
database, a revised approach and algorithm for ranking substances was
developed in 1991, and a notice announcing the intention of ATSDR and
EPA to revise and rerank the Priority List of Hazardous Substances was
published on June 27, 1991 (56 FR 29485). The subsequent 1991 Priority
List and revised approach used for its compilation was summarized in
the ``Revised Priority List of Hazardous Substances'' Federal Register
notice published October 17, 1991 (56 FR 52166). The same approach and
the same basic algorithm have been used in all subsequent activities,
including the 2005 listing activity. The algorithm used in ranking
hazardous substances on the priority list consists of three criteria,
which are combined to result in the total score. The three criteria
are: Frequency of occurrence at NPL sites; toxicity; and potential for
human exposure.
Since HazDat is a dynamic database with ongoing data collection,
additional information from the HazDat database became available for
the 2005 listing activity. This additional information has been entered
into HazDat since the development of the 2003 Priority List of
Hazardous Substances. The site-specific information from HazDat that is
used in the listing activity has been collected from ATSDR public
health assessments and from site file data packages that are used to
develop these public health assessments. The new information may
include more recent NPL frequency of occurrence data, additional
concentration data, and more information on exposure to substances at
NPL sites. With these additional data, 10 substances have been replaced
on the list of 275 substances since the 2003 publication. Of the 10
replacement substances, 2 are new candidate substances, and 8 are
substances that were previously under consideration. These replacement
substances and changes in the order of substances appearing on the
CERCLA Priority List of Hazardous Substances will be reflected in the
program activities that rely on the list for future direction.
The 2005 Priority List of Hazardous Substances includes 275
substances that have been determined to be of greatest concern to
public health based on the criteria of CERCLA section 104(i)(2) [42
U.S.C. 9604(i)(2)]. A total of 861 candidate substances have been
analyzed and ranked with the current algorithm. Of these candidates,
the 275 substances on the priority list may become the subject of
toxicological profiles in the future. The top 25 substances on the 2005
Priority List of Hazardous Substances are listed below.
------------------------------------------------------------------------
Rank Substance name
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1................................ Arsenic
2................................ Lead
3................................ Mercury
4................................ Vinyl Chloride
5................................ Polychlorinated Biphenyls
6................................ Benzene
7................................ Polycyclic Aromatic Hydrocarbons
8................................ Cadmium
9................................ Benzo (A) Pyrene
10............................... Benzo (B) Fluoranthene
11............................... Chloroform
12............................... Ddt, P,P'-
13............................... Aroclor 1254
14............................... Aroclor 1260
15............................... Dibenzon (A,H) Anthracene
16............................... Trichloroethylene
17............................... Dieldrin
18............................... Chromium, Hexavalent
19............................... Phosphorus, White
20............................... Dde, P,P'-
21............................... Chlordane
22............................... Hexachlorobutadiene
23............................... Coal Tar Creosote
24............................... Ddd, P',P'-
25............................... Aldrin
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ATSDR intends to publish the next revised list of hazardous
substances in two years, with an informal review and revision performed
in one year. These revisions will reflect changes and improvements in
data collection and
[[Page 72842]]
availability. Additional information on the existing methodology used
in the development of the CERCLA Priority List of Hazardous Substances
can be found in the Support Document to the List and in the Federal
Register notices mentioned above.
In addition to the revised priority list, ATSDR is also releasing a
Completed Exposure Pathway Site Count Report. A completed exposure
pathway (CEP) is an exposure pathway that links a contaminant source to
a receptor population. The CEP ranking is very similar to a sub-
component of the potential-for-human-exposure component of the listing
algorithm. The CEP ranking is based on a site frequency count, and thus
lists the number of sites at which a substance has been found in a CEP.
ATSDR's HazDat database contains this information which is derived from
ATSDR public health assessments and health consultations. Because
exposure to hazardous substances is of significant concern, ATSDR is
publishing this CEP report along with the CERCLA Priority List of
Hazardous Substances. Since this CEP report focuses on documented
exposure, it provides an important prioritization based on substances
to which people are exposed.
The substances on the CEP report are similar to the substances on
the CERCLA Priority List of Hazardous Substances. However, there are
some substances that are on the CEP report because they are frequently
found in completed exposure pathways, but are not on the CERCLA
Priority List because they have a very low toxicity (e.g., sodium).
Since the CERCLA Priority List incorporates three different components
(toxicity, frequency of occurrence, and potential for human exposure)
to determine its priority substances, substances with very low toxicity
are not on the CERCLA Priority List and consequently are not the
subject of toxicological profiles. In addition, since the Priority List
is mandated by CERCLA, it only uses data from sites on the CERCLA
National Priorities List, whereas the CEP report uses data from all
sites with ATSDR activities that have a CEP. Of the 100 substances on
the CEP report, the 25 substances found at the most number of sites in
a CEP are presented below.
------------------------------------------------------------------------
Number of
sites with
substance in a
Substance name CEP
---------------
All NPL
sites sites
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Lead.................................................... 431 267
Trichloroethylene....................................... 363 286
Arsenic................................................. 341 208
Tetrachloroethylene..................................... 280 207
Benzene................................................. 210 137
Cadmium................................................. 207 136
Volatile Organic Compounds, Unspecified................. 193 132
Chromium................................................ 193 129
Polychlorinated Biphenyls............................... 177 116
Mercury................................................. 167 93
Manganese............................................... 164 95
Zinc.................................................... 158 95
Copper.................................................. 143 83
1,1,1-Trichloroethane................................... 135 110
Chloroform.............................................. 124 92
Benzo(A)Pyrene.......................................... 122 58
1,1-Dichloroethene...................................... 117 96
Polycyclic Aromatic Hydrocarbons........................ 117 79
Nickel.................................................. 112 70
Methylene Chloride...................................... 111 73
Toluene................................................. 111 68
Antimony................................................ 108 69
Vinyl Chloride.......................................... 103 84
Barium.................................................. 102 56
1,2-Dichloroethane...................................... 96 77
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Note: Sorted by the All Sites column.
All Sites = all sites with ATSDR activities that have a CEP; NPL.
Sites = current and former sites on the National Priorities List, as
mandated.
Dated: November 29, 2005.
Ken Rose,
Acting Director, Office of Policy, Planning and Evaluation, National
Center for Environmental Health/Agency for Toxic Substances and Disease
Registry.
[FR Doc. E5-6971 Filed 12-6-05; 8:45 am]
BILLING CODE 4163-70-P