Thursday
December 10, 1998
Part IV
Environmental
Protection Agency
National Recommended Water Quality
Criteria; Notice; Republication
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68354
Federal Register/Vol. 63, No. 237/Thursday, December 10, 1998/Notices
ENVIRONMENTAL PROTECTION
AGENCY
[FRL-OW-6186-6a]
National Recommended Water Quality
Criteria; Republication
Editorial Note: FR Doc. 98-30272 was
originally published as Part IV (63 FR 67548-
67558) In the issue of Monday, December 7,
1998. At the request of the agency, due to
incorrect footnote identifiers in the tables,
the corrected document is being republished
in Its entirety.
AGENCY: Environmental Protection
Agency (EPA).
ACTION: Compilation of recommended
water quality criteria and notice of
process for new and revised criteria.
SUMMARY: EPA is publishing a
compilation of its national
recommended water quality criteria for
157 pollutants, developed pursuant to
section 304 (a) of the Clean Water Act
(CWA or the Act). These recommended
criteria provide guidance for States and
Tribes in adopting water quality
standards under section 303 (c) of the
CWA, Such standards are used in
implementing a number of
environmental programs, including
setting discharge limits in National
Pollutant Discharge Elimination System
(NPDES) permits. These water quality
criteria are not regulations, and do not
impose legally binding requirements on .
EPA, States, Tribes or the public.
This document also describes changes
in EPA's process for deriving new and
revised 304 (a) criteria. Comments
provided to the Agency about the
content of this Notice will be considered
in future publications of water quality
criteria and in carrying out the process
for deriving water quality criteria. With
this improved process the public will
have more opportunity to provide data
and views for consideration by EPA.
The public may send any comments or
observations regarding the compilation
format or the process for deriving new
or revised water quality criteria to the
Agency now, or anytime while the
process is being implemented.
ADDRESSES: A copy of the document,
"National Recommended Water Quality
Criteria" is available from the U.S. EPA,
National Center for Environmental
Publications and Information, 11029
Kenwood Road, Cincinnati, Ohio 45242,
phone (513) 489-8190. The publication
is also available electronically at: http:/
/www.epa.gov/ost. Send an original and
3 copies of written comments to W-98-
24 Comment Clerk, Water Docket, MC
4104, US EPA, 401 M Street, S.W.,
Washington, D.C. 20460. Comments
may also be submitted electronically to
OW-Docket@epamail.epa.gov.
Comments should be submitted as a
WPS. 1,6.1 or an ASCII file with no form
of encryption. The documents cited in
the compilation of recommended
criteria are available for inspection from
9 to 4 p.m., Monday through Friday,
excluding legal holidays, at the Water
Docket, EB57, East Tower Basement,
USEPA, 401 M St., S.W., Washington,
D.C. 20460. For access to these
materials, please call (202) 260-3027 to
schedule an appointment.
FOR FURTHER INFORMATION CONTACT:
Cindy A. Roberts, Health and Ecological
Criteria Division (4304), U.S. EPA, 401
M. Street, S.W., Washington, D.C.
20460; (202) 260-2787;
roberts.cindy@epamail.epa.gov.
SUPPLEMENTARY INFORMATION:
I. What Are Water Quality Criteria?
Section 304(a)(l) of the Clean Water
Act requires EPA to develop and
publish, and from time to time revise,
criteria for water quality accurately
reflecting the latest scientific
knowledge. Water quality criteria
developed under section 304 (a) are
based solely on data and scientific
judgments on the relationship between
pollutant concentrations and
environmental and human health
effects. Section 304 (a) criteria do not
reflect consideration of economic
impacts or the technological feasibility
of meeting the chemical concentrations
in ambient water. Section 304 (a) criteria
provide guidance to States and Tribes in
adopting water quality standards that
ultimately provide a basis for
controlling discharges or releases of
pollutants. The criteria also provide
guidance to EPA when promulgating
federal regulations under section 303 (c)
when such action is necessary.
II. What is in the Compilation
Published Today?
EPA is today publishing a
compilation of its national
recommended water quality criteria for
157 pollutants. This compilation is also
available in hard copy at the address
given above.
The compilation is presented as a
summary table containing EPA's water
quality criteria for 147 pollutants, and
for an additional 10 pollutants, criteria
solely for organoleptic effects. For each
set of criteria, EPA lists a Federal
Register citation, EPA document
number or Integrated Risk Information
System (IRIS) entry (www.epa.gov/
ngispgm3/iris/irisdat). Specific
information pertinent to the derivation
of individual criteria may be found in
cited references. If no criteria are listed
for a pollutant, EPA does not have any
national recommended water quality
criteria.
These water quality criteria are the
Agency's current recommended 304 (a)
criteria, reflecting the latest scientific
knowledge. They are generally
applicable to the waters of the United
States. EPA recommends that States and
Tribes use these water quality criteria as
guidance in adopting water quality
standards pursuant to section 303 (c) of
the Act and the implementing of federal
regulations at 40 CFR part 131. Water
quality criteria derived to address site-
specific situations are not included;
EPA recommends that States and Tribes
follow EPA's technical guidance in the
"Water Quality Standards Handbook—
2nd Edition," EPA, August 1994, in
deriving such site-specific criteria. EPA
recognizes that in limited circumstances
there may be regulatory voids in the
absence of State or Tribal water quality
standards for specific pollutants.
However, States and Tribes should
utilize the existing State and Tribal
narrative criteria to address such
situations; States and Tribes may
consult EPA criteria documents and
cites in the summary table for additional
information.
The national recommended water
quality criteria include: previously
published criteria that are unchanged;
criteria that have been recalculated from
earlier criteria; and newly calculated
criteria, based on peer-reviewed
assessments, methodologies and data,
that have not been previously
published.
The information used to calculate the
water quality criteria is not included in
the summary table. Most information
has been previously published by the
Agency in a variety of sources, and the
summary table cites those sources.
When using these 304 (a) criteria as
guidance in adopting water quality
standards, EPA recommends States and
Tribes consult the citations referenced
in the summary table for additional
information regarding the derivation of
individual criteria.
The Agency intends to revise the
compilation of national recommended
water quality criteria from time to time
to keep States and Tribes informed as to
the most current recommended water
quality criteria.
III. How Are National Recommended
Water Quality Criteria Used?
Once new or revised 304 (a) criteria
are published by EPA, the Agency
expects States and Tribes to adopt
promptly new or revised numeric water
quality criteria into their Standards
consistent with one of the three options
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Federal Register/Vol. 63. No. 237/Thursday. 'December 10, 1998/Nptices
68355
in 40 CFR 131.11. These options are: (1)
Adopt the recommended section 304 (a)
criteria; (2) adopt section 304 (a) criteria
modified to reflect site-specific
conditions; or, (3) adopt criteria derived
using other scientifically defensible
methods. In adopting criteria under
option (2) or (3), States and Tribes must
adopt water quality criteria sufficient to
protect the designated uses of their
waters. When establishing a numerical
value based on 304 (a) criteria, States
and Tribes may reflect site specific
conditions or use other scientifically
. defensible methods: However, States'
and Tribes should not selectively apply
data or selectively use endpoints,
species, risk levels, or exposure
parameters in deriving criteria; this
would not accurately characterize risk
and would not result in criteria
protective of designated uses.
EPA emphasizes that,,in the course of
carrying out its responsibilities under
section 303 (c), it reviews State and
Tribal water quality standards to assess
the need for new or revised water
quality criteria. EPA generally believes
that five years from the date of EPA's
publication of new or revised water
quality criteria is a reasonable time by "
which States and Tribes should take
action to adopt new or revised water
quality criteria necessary to protect the
designated uses of their waters. This
period is intended to accommodate
those States and Tribes that have begun
a triennial review and wish to complete
the actions they have underway,
deferring initiating adoption of new or
revised section 304(a) criteria until the
next triennial review.
IV. What is the Status of Existing
Criteria While They Are Under
Revision?
The question of the status of the
. existing section 304 (a) criteria often
arises when EPA announces that it is
beginning a reassessment of existing •
criteria. The general answer is that ;
water quality criteria published by EPA
remain the Agency's recommended
water quality criteria until EPA revises
or withdraws the criteria. For example,
while undertaking recent reassessments
of dioxin, PCBs, and other chemicals,
EPA has consistently upheld the use of
the current section 304 (a) criteria for
these chemicals and considers them to
be scientifically sound until new, peer
.reviewed, scientific assessments.
indicate changes are needed. Therefore,
the criteria in today's notice are and Will
continue to be the Agency's national
recommended water quality criteria for
States and Tribes to use in adopting or
revising their water quality standards
until superseded by the publication of
revised criteria, or withdrawn by notice
in the Federal Register.
V. What is the Process for Developing
New or Revised Criteria?
Section 3Q4(a)(l) of the CWA requires
the Agency to develop and publish, and
from time to time revise, criteria for
water quality accurately reflecting the
latest scientific knowledge. The Agency
has developed an improved process that
it intends to use when deriving new
criteria or conducting a major
reassessment of existing criteria. The
purpose of the improved process is to
provide expanded opportunities for"
public input, and to make the process
more efficient. " ' •
When deriving new criteria, or when
initiating a major reassessment of
existing criteria, EPA will take the
following steps. .
1. EPA will first undertake a
comprehensive review of available data
and information.
2. EPA will publish a notice in the
Federal Register and on the Internet
announcing its assessment or
•reassessment of the pollutant, the .
notice will describe the data available to
the Agency, and will solicit any
additional pertinent data or views that
may be useful in deriving new or
revised criteria. EPA is especially
interested in hearing from the public
regarding new data or information that
was unavailable to the Agency, and
scientific views as to the application of
the relevant Agency methodology for
deriving water quality criteria.
3. After public input is received and
evaluated, EPA will then utilize
information obtained from both the -
Agency's literature review and the.
public to develop draft recommended
Water quality criteria. . ..
4. EPA will initiate a peer review of
the draft criteria. Agency peer review
consists of a documented critical review
by qualified independent experts.
Information about EPA peer review
practices may be found in the Science
Policy Council's Peer Review Handbook
(EPA 100-B-98-001, www.epa.gov).
5. Concurrent with the peer review-in
step four, EPA will publish a notice in
the Federal Register and on the Internet,
of the availability of the draft water
quality criteria and solicit views from
the public on issues of science
pertaining to the,inforrhation used in
deriving the,draft criteria. The Agency
believes it is important to provide the
public with the opportunity to provide
scientific views on the draft criteria
even though we are not required to '
invite and respond to written
comments.
6. EPA will evaluate the results of the
peer review, and prepare a response
document for the record in accordance
with EPA's Peer Review Handbook. EPA
at the same time will consider views
provided by the public on issues of
science. Major scientific issues will be
addressed in the record whether from
the peer review or the public.
' 7. EPA will then revise the draft
criteria as necessary, and announce the
availability of the final water quality
criteria in the Federal Register and on
the Internet.
VI. What is the Process for Minor
Revisions to Criteria?
In addition to developing new
criteria, and conducting major
reassessments of existing criteria, EPA
also from time to time recalculates
criteria based on new information
pertaining tb individual components of
the criteria. For example^ in today's
notice, EPA has recalculated a number
of criteria based on new, peer-reviewed
data contained in EPA's IRIS. Because
such recalculations normally result in
only minor changes to the criteria, do
not ordinarily involve a change in the
underlying scientific methodologies,
and reflect peer-reviewed data, EPA will
typically publish such recalculated
criteria directly as the Agency's
recommended water quality criteria. If it
appears that a recalculation results in a
significant change EPA will follow the
process of peer review and public input
outlined above. Further, when EPA
recalculates national water quality
criteria in the course of proposing or
promulgating state-specific federal
water quality standards pursuant to
section 303(c), EPA will offer an
opportunity for national public input on
the recalculated criteria.
VII. How Does the Process Outlined
Above Improve Public Input and
Efficiency?
In the past, EPA developed draft
criteria documents and announced their
availability for public comment in the
Federal Register. This led to new data
and views coming to EPA's attention
after draft criteria had already been
developed. Responding to new data
would sometimes lead to .extensive
revisions.
The steps outlined above improve the
criteria development process in the
following ways.
1, The new process is Internet-based
which is in line with EPA policy for
public access and dissemination of
information gathered by EPA. Use of the
Internet will allow the public to be more
engaged in the criteria development
process than previously and to more
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68356
Federal Register/Vol. 63, No. 237/Thursday, December 10, 1998/Notices
knowledgeably follow criteria
development. For new criteria or major
revisions, EPA will announce its
Intentions to derive the new or revised
criteria on the Internet and include a list
of the available literature. This will give
the public an opportunity to provide
additional data that might not otherwise
be identified by the Agency.
2. The public now has two
opportunities to contribute data and
views, before development and during
development, instead of a single
opportunity after development.
3. EPA has instituted broader and
more formal peer review procedures.
This independent scientific review is a
more rigorous disciplinary practice to
ensure technical improvements in
Agency decision making. Previously,
EPA used the public comment process
outlined above to obtain peer review.
The new process allows for both public
input and a formal peer review.
resulting in a more thorough and
complete evaluation of the criteria.
4. Announcing the availability of the
draft water quality criteria on the
Internet will give the public an
opportunity to provide input on issues
of science in a more timely manner.
VIII. Where Can I Find More
Information About Water Quality
Criteria and Water Quality Standards?
For more information about water
quality criteria and Water Quality
Standards refer to the following: Water
Quality Standards Handbook (EPA 823-
B94-005a); Advanced Notice of
Proposed Rule Making (ANPRM), (63 FR
36742); Water Quality Criteria and
Standards Plan—Priorities for the
Future (EPA 822-R-98-003); Guidelines
and Methodologies Used in the
Preparation of Health Effects
Assessment Chapters of the Consent
'Decree Water Criteria Documents (45 FR
79347); Draft Water Quality Criteria
Methodology Revisions: Human Health
(63 FR 43755, EPA 822-Z-98-001); and
Guidelines for Deriving Numerical
National Water Quality Criteria for the
Protection of Aquatic Organisms and
Their Uses (EPA 822/R-85-100); s
National Strategy for the Development
of Regional Nutrient Criteria (EPA 822- -
R-98-002).
These publications may also be
accessed through EPA's National Center
for Environmental Publications and
Information (NCEPI)»or on the Office of
Science and Technology's Home-page
(www.epa.gov/OST).
IX. What Are the National
Recommended Water Quality Criteria?
The following compilation and its
associated footnotes and notes presents
the national recommended water quality
criteria.
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Federal Register/Vol. 63, No. 237/Thursday, December 10, 1998/Notices
68357
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Federal Register/Vol. 63, No. 237/Thursday, December 10, 1998/Notices.
68361
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68362
Federal Register/Vol. 63, No. 237/Thursday, December 10, 1998/Notices
NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR ORGANOLEPTIC EFFECTS
Pollutant
1 Acenaphthene ;
2 Monochlorobenzene
3 3-Chlorophenol
4 4-Chlorophenol
5 2,3-Dlchlorophenol
6 2,5-DichlorophenoI
7 2,6-Dlchlorophenol
8 3,4-Dichlorophenol '.
9 2,4,5-Trichlorophenol
10 2,4,6-Trichforophenol
11 2,3,4,6-TetrachIorophenol '.
12 2-Methyl-4-Chlorophenol
13 3-M8thyl-4-Chlorophenol
14 3-Methyl-6-Chlorophenol
15 2-Chlorophenol
18 Copper
17 2,4-Dichlorophenol : :
18 2,4-Ditnethylphenol
19 Hexachlorocyclopentadiene .
20 Nitrobenzene i
21 Pentachlorophenol .'
22 Phenol '.
23 Zinc
GAS No.
208968
108907
106489
95954
88062
59507
95578
744058
1 20832
1 05679
77474
98953
87865
108952
7440666
Organoleptic
effect criteria
. (W3/L)
20
20
0.1
0 1
0 04
0 5
02
03
1
2
1
1800
3000
20
01
1000
03
400
1
30
30
300
5000
FR cite/source
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
Gold Book
45 -FR 79341
General Notes:
1. These criteria are based on organoleptic (taste and odor) effects. Because of variations in chemical nomenclature systems, this listing of
pollutants does not duplicate the listing in Appendix A of 40 CFR Part 423. Also listed are the Chemical Abstracts Service (CAS) registry num-
bers, which provide a unique identification for each chemical. , ' -
National Recommended Water Quality Criteria
Additional Notes
1. Criteria Maximum Concentration and Criterion Continuous Concentration
The Criteria Maximum Concentration (CMC) is an estimate of the highest concentration of a material in surface water to which .
an aquatic community can be exposed briefly without resulting in an unacceptable effect. The Criterion Continuous Concentration
(CCC) is an estimate of the highest concentration of a material in surface water to which an aquatic community can be exposed
Indefinitely without resulting in an unacceptable effect. The CMC and CCC are just two of the six parts of a aquatic life criterion;
the other four parts are the acute averaging period, chronic averaging period, acute frequency of allowed exceedence, and chronic
frequency of allowed exceedence. Because 304(a) aquatic life criteria are national guidance, they are intended to be protective of
the vast majority of the aquatic communities in the United States.
2. Criteria Recommendations for Priority Pollutants, Non Priority Pollutants and Organoleptic Effects
This compilation lists all priority toxic pollutants and some non priority toxic pollutants, and both human health effect and
organoleptic effect criteria issued pursuant to CWA §304(a). Blank spaces indicate that EPA has no CWA §304(a) criteria recommenda-
tions. For a number of non-priority toxic pollutants not listed, CWA §304(a) "water + organism" human health criteria are not available,
but, EPA has published MCLs under the SDWA that may be used in establishing water quality standards to protect water supply
designated uses. Because of variations in chemical nomenclature systems, this listing of toxic pollutants does not duplicate the listing
In Appendix A of 40 CFR Part 423. Also listed are the Chemical Abstracts Service CAS registry numbers, which provide a unique
Identification for each chemical.
3. Human Health Risk
The human health criteria for the priority and non priority pollutants are based on carcinogenicity of 10 ~6 risk. Alternate risk
levels may be obtained by moving the decimal point (e.g., for a risk level of 10-5, move the decimal point in the recommended
criterion one place to the right).
4. Water Quality Criteria Published Pursuant to Section 304(a) or Section 303(c) of the CWA
Many of the values "in the compilation were published in the proposed California Toxics Rule (CTR, 62 FR 42160). Although
such values were published pursuant to Section 303(c) of the CWA, they represent the Agency's most recent calculation of water*
quality criteria and thus are published today as the Agency's 304 (a) criteria. Water quality criteria published in the proposed CTR
may be revised when EPA takes final action on the CTR.
5. Calculation of Dissolved Metals Criteria
The 304(a) criteria for metals, shown as dissolved metals, are calculated in one of two ways. For freshwater metals criteria that
are hardness-dependent, the dissolved metal criteria'were calculated using a hardness of 100 mg/1 as CaCO3 for illustrative purposes
only. Saltwater and freshwater metals' criteria that are not hardness-dependent are calculated by multiplying the total recoverable
criteria before rounding by the appropriate conversion factors. The final dissolved metals' criteria in the table are rounded to two
significant figures. Information regarding the calculation of hardness dependent conversion factors are included in the .footnotes.
6. Correction of Chemical Abstract Services Number
The Chemical Abstract Services number (CAS) for Bis(2-Chloroisopropyl) Ether, has been corrected in the table. The correct CAS
number for this chemical is 39638-32-9. Previous publications listed 108-60-1 as the CAS number for this chemical.
-------
• . • Federal Register/Vol. 63. No. 237/Thursday, December 10, 1998/Notices ' 68363
7. Maximum Contaminant Levels •
The compilation includes footnotes for pollutants with Maximum Contaminant Levels (MCLs) more stringent than the recommended
water quality criteria in the compilation, MCLs for these pollutants are not included in the compilation, but can be found in the
appropriate drinking water regulations (40 CFR 141.11-16 arid 141,.60-63), or can be accessed through the Safe Drinking Water Hotline
(800-426-4791) or the Internet (http://www.epa.gov/ost/tools/dwstds.-s.html). . -
.8. Organoleptic Effects '-.-'•
The compilation contains 304 (a) criteria for pollutants with toxicity-based criteria as well as non-tpxicity based criteria. The basis
for the non-toxicity based criteria are organoleptic effects (e.g., taste and odor) which would make water and edible aquatic life
unpalatable but not toxic to humans. The table includes criteria for organoleptic effects for 23 pollutants. Pollutants with organoleptic
effect criteria more 'stringent than the criteria based on toxicity (e.g., included in both the priority and non-priority pollutant tables)
- are footnoted as such..
9. Category Criteria .
In the 1980 criteria documents, certain recommended water quality criteria were published for categories of pollutants rather than
for individual pollutants within that category. Subsequently, in a series of separate actions, the Agency derived criteria for specific
pollutants within a category. Therefore, in this compilation EPA is replacing criteria representing categories with individual pollutant
criteria (e.g., 1,3-dichlorobenzene, 1,4-dichlorobenzene and 1,2-dichlorobenzene).
10. Specific Chemical Calculations , .-'.-.
A. Selenium
(1) Human Health •
In the 1980 Selenium document, a criterion for the protection of human health from consumption'of water and organisms was
calculated based on a BCF of 6.0 L/kg and a maximum wateMelated contribution of 35 (ig Se/day.' Subsequently, the EPA Office
of Health and Environmental Assessment issued an errata notice (February 23, 1982), revising the BCF for selenium to 4.8 L/kg.
In 1988, EPA issued an addendum (ECAO-CIN-668) revising the human health criteria for-selenium. Later in the final National
Toxic Rule (NTR, 57 FR 60848), EPA withdrew previously published selenium human health criteria,, pending Agency review of
new epidemiological data. • . ... •
, This compilation includes human health criteria for selenium, calculated using a BCF of 4.8 L/kg along with the current IRIS
RfD of 0.005 mg/kg/day. EPA included these recommended water quality criteria in the compilation because the data necessary for
calculating a criteria in accordance with EPA's 1980 human health methodology are available. . '
(2) Aquatic Life
This compilation contains aquatic, life criteria for selenium that are the same as those published in the proposed CTR. In the
CTR, EPA proposed an acute criterion for selenium based oh the criterion proposed for selenium in the Water Quality" Guidance
for the Great Lakes. System (61 FR 58444). The GLI and CTR proposals take into account data showing that selenium's two most
prevalent oxidation states, selenite and selenate, present .differing potentials for aquatic toxicity, as well as new data indicating that
various forms of selenium are additive. The new approach produces a different selenium acute criterion concentration, or CMC, depending
upon the relative proportions of selenite, selenate, and other forms of selenium that are present.
EPA notes it is currently undertaking a reassessment of selenium, and expects the 304(a) criteria for selenium will be revised
based on the final reassessment (63 FR 26186). However, until such time as revised water quality criteria for selenium are published
by the Agency, the recommended water quality criteria in this compilation are EPA's current 304 (a) criteria. "
B. 1,2,4-Trichlorobenzene and Zinc
Human health criteria for 1,2,4-trichlorobenzene and zinc have hot been previously published.. Sufficient information is now available
for calculating water quality criteria for the protection of human health from the consumption of aquatic organisms and.the consumption
of aquatic organisms and water for both-these compounds. Therefore, EPA is publishing-criteria for these pollutants in this compilation.
C. Chromium (III)
The recommended aquatic life water quality criteria for chromium (III) included in the compilation are based on the values presented
in the document titled: 1995 Updates: Water Quality Criteria Documents for the Protection of Aquatic Life in Ambient Water, however,
this document contains criteria, based on the total recoverable fraction. The chromium (III) criteria in this compilation were calculated
by applying the conversion factors used in the Final Water Quality Guidance for the Great Lakes System (60 FR 15366) to the
1995 Update document values. .
D. Ether, Bis (Chloromethyl), Pentachlorobenzene, Tetrachlorobenzene 1.2,4,5- Trichlorophenol
Human health criteria for these pollutants were last published in EPA's Quality Criteria for Water. 1986 or "Gold Book". Some
of these criteria were calculated using Acceptable Daily Intake (ADIs) rather than RfDs. Updated ql*s and RfDs are now available
in IRIS for ether, bis (chloromethyl), pentachlorobenzene, tetrachlorobenzene 1,2,4,5-, and trichlorophenol, and were used to revise
the water quality criteria for these compounds. The recommended water quality criteria for ether, bis (chloromethyl) were revised
using an updated ql*, while criteria for pentachlorobenzene, and tetrachlorobenzene 1,2,4,5-, and trichlorophenol were derived using
an updated RfD value.
E. PCBs . ' . ' .
In this compilation EPA is publishing aquatic life and human health criteria based on total PCBs rather than individual arochlors.
These criteria replace the previous criteria for the seven individual arochlors. Thus, there are criteria for a total of 102 of the 126
priority pollutants. , .
Dated: October 26, 1998. ' .
J. Charles Fox, - .
Assistant Administrator, Office of Water.
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68364
Federal Register/Vol. 63, No. 237/Thursday, December 10, 1998/Notices
Appendix A—Conversion Factors for Dissolved Metals
Metal
Arsenic , '.....
Cadmium
Chromium III
Chromium VI
CoDoer
Lead
Mercury .,
Nickel
Selenium
Silver
Zinc ,
Conversion fac-
tor freshwater
CMC
1.000
1.138672-[(ln
hardness)
(0.041838)]
0316
0982
0960
1 46203-[(ln
hardness)
(0.145712)]
0.85
0998
0.85
0978
Conversion fac-
tor freshwater
ccc.
1 000
1 101672-[(ln
hardness)
(0.041838)]
0860
0 962
0 960
1 46203-[(ln
hardness)
(0.145712)]
085
0997
0986
Conversion fac-
tor saltwater
CMC
1 000
0 994
0 993
0 83
0 951
085
0 990
0998
0 85
0 946
Conversion fac-
tor saltwater
• ccc
1 000
0 994
0 993
0 83
0 951
0 85
0 990
0998
0 946
Appendix B—Parameters for Calculating Freshwater Dissolved Metals Criteria That Are Hardness-Dependent
Chemical
Cadmium
Chromium III
Copper
Lead
Nickel
Silver
Zinc
1 128
0.8190
0.9422
1 273
0.8460
1.72
0.8473
h.
- 3 6867
3.7256
1 700
-1 460
2.255
-6.52
0.884
0 7852
0.8190
0 8545
1 273
0 8460
08473
h_
2 715
06848
1 702
4705
0 0584
0884
Freshwater conve
Acute
1 136672-[ln (hard-
ness)(0.041838)]
0316
0 960
1 46203-[ln (hard-
ness)^. 14571 2)]
0998
0 85
0 978
sion factors (CF)
Chronic
1 miR7P-rin Ihard-
ness)(0.041838)]
0 860
0 960
1 46203-[ln (hard-
ness)(0.145712)]
0 997
0 986
Appendix C—Calculation of Freshwater Ammonia Criterion
1. The one-hour average concentration of total ammonia nitrogen (in mg N/L) does not exceed, more than once every three years
on the average, the CMC calculated using the following equation:
CMC = -
0.275
39.0
1 + 107.204-pH 1 + 1()pH-7.204
In situations where salmonids do not occur, the CMC may be calculated using the following equation:
0.411 58.4
CMC =
1 + 107.204-pH l + 1()pH-7.204
2. The thirty-day average concentration of total ammonia nitrogen (in mg N/L) does not exceed, more than once every three
years on the average, the CCC calculated using the following equation:
ccc =
0.0858
3.70
1 + 107.688-pH 1 + 1()pH-7.688
Editorial Note: FR Doc. 98-30272 was originally published as Part IV (63 FR 67548-67558) in the issue of Monday, December
7, 1998. At the request of the agency, due to incorrect footnote identifiers in the tables, the corrected document is being republished
In Its entirety.
(FR Doc. 98-30272 Filed 12-4-98; 8:45 am]
BILUNG CODE 1505-01-D
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