[Code of Federal Regulations]
[Title 40, Volume 18]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR131.38]
[Page 415-426]
TITLE 40--PROTECTION OF ENVIRONMENT
CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
PART 131--WATER QUALITY STANDARDS--Table of Contents
Subpart D--Federally Promulgated Water Quality Standards
Sec. 131.38 Establishment of numeric criteria for priority toxic pollutants for the State of California.
(a) Scope. This section promulgates criteria for priority toxic
pollutants in the State of California for inland surface waters and
enclosed bays and estuaries. This section also contains a compliance
schedule provision.
(b)(1) Criteria for Priority Toxic Pollutants in the State of
California as described in the following table:
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[GRAPHIC] [TIFF OMITTED] TR18MY00.007
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[GRAPHIC] [TIFF OMITTED] TR18MY00.008
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[GRAPHIC] [TIFF OMITTED] TR18MY00.009
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[GRAPHIC] [TIFF OMITTED] TR18MY00.010
Footnotes to Table in Paragraph (b)(1):
a. Criteria revised to reflect the Agency q1* or RfD, as contained
in the Integrated Risk Information System (IRIS) as of October 1, 1996.
The fish tissue bioconcentration factor (BCF) from the 1980 documents
was retained in each case.
b. Criteria apply to California waters except for those waters
subject to objectives in Tables III-2A and III-2B of the San Francisco
Regional Water Quality Control Board's (SFRWQCB) 1986 Basin Plan, that
were adopted by the SFRWQCB and the State Water Resources Control Board,
approved by EPA, and which continue to apply.
c. Criteria are based on carcinogenicity of 10 (-6) risk.
d. Criteria Maximum Concentration (CMC) equals the highest
concentration of a pollutant to which aquatic life can be exposed for a
short period of time without deleterious effects. Criteria Continuous
Concentration (CCC) equals the highest concentration of a pollutant to
which aquatic life can be exposed for an extended period of time (4
days) without deleterious effects. ug/L equals micrograms per liter.
e. Freshwater aquatic life criteria for metals are expressed as a
function of total hardness (mg/L) in the water body. The equations are
provided in matrix at paragraph (b)(2) of this section. Values displayed
above in the matrix correspond to a total hardness of 100 mg/l.
f. Freshwater aquatic life criteria for pentachlorophenol are
expressed as a function of pH, and are calculated as follows: Values
displayed above in the matrix correspond to a pH of 7.8. CMC =
exp(1.005(pH)-4.869). CCC = exp(1.005(pH)-5.134).
g. This criterion is based on 304(a) aquatic life criterion issued
in 1980, and was issued in one of the following documents: Aldrin/
Dieldrin (EPA 440/5-80-019), Chlordane (EPA 440/5-80-027), DDT (EPA 440/
5-80-038), Endosulfan (EPA 440/5-80-046), Endrin (EPA 440/5-80-047),
Heptachlor (440/5-80-052), Hexachlorocyclohexane (EPA 440/5-80-054),
Silver (EPA 440/5-80-071). The Minimum Data
[[Page 420]]
Requirements and derivation procedures were different in the 1980
Guidelines than in the 1985 Guidelines. For example, a ``CMC'' derived
using the 1980 Guidelines was derived to be used as an instantaneous
maximum. If assessment is to be done using an averaging period, the
values given should be divided by 2 to obtain a value that is more
comparable to a CMC derived using the 1985 Guidelines.
h. These totals simply sum the criteria in each column. For aquatic
life, there are 23 priority toxic pollutants with some type of
freshwater or saltwater, acute or chronic criteria. For human health,
there are 92 priority toxic pollutants with either ``water + organism''
or ``organism only'' criteria. Note that these totals count chromium as
one pollutant even though EPA has developed criteria based on two
valence states. In the matrix, EPA has assigned numbers 5a and 5b to the
criteria for chromium to reflect the fact that the list of 126 priority
pollutants includes only a single listing for chromium.
i. Criteria for these metals are expressed as a function of the
water-effect ratio, WER, as defined in paragraph (c) of this section.
CMC = column B1 or C1 value x WER; CCC = column B2 or C2 value x WER.
j. No criterion for protection of human health from consumption of
aquatic organisms (excluding water) was presented in the 1980 criteria
document or in the 1986 Quality Criteria for Water. Nevertheless,
sufficient information was presented in the 1980 document to allow a
calculation of a criterion, even though the results of such a
calculation were not shown in the document.
k. The CWA 304(a) criterion for asbestos is the MCL.
l. [Reserved]
m. These freshwater and saltwater criteria for metals are expressed
in terms of the dissolved fraction of the metal in the water column.
Criterion values were calculated by using EPA's Clean Water Act 304(a)
guidance values (described in the total recoverable fraction) and then
applying the conversion factors in Sec. 131.36(b)(1) and (2).
n. EPA is not promulgating human health criteria for these
contaminants. However, permit authorities should address these
contaminants in NPDES permit actions using the State's existing
narrative criteria for toxics.
o. These criteria were promulgated for specific waters in California
in the National Toxics Rule (``NTR''), at Sec. 131.36. The specific
waters to which the NTR criteria apply include: Waters of the State
defined as bays or estuaries and waters of the State defined as inland,
i.e., all surface waters of the State not ocean waters. These waters
specifically include the San Francisco Bay upstream to and including
Suisun Bay and the Sacramento-San Joaquin Delta. This section does not
apply instead of the NTR for this criterion.
p. A criterion of 20 ug/l was promulgated for specific waters in
California in the NTR and was promulgated in the total recoverable form.
The specific waters to which the NTR criterion applies include: Waters
of the San Francisco Bay upstream to and including Suisun Bay and the
Sacramento-San Joaquin Delta; and waters of Salt Slough, Mud Slough
(north) and the San Joaquin River, Sack Dam to the mouth of the Merced
River. This section does not apply instead of the NTR for this
criterion. The State of California adopted and EPA approved a site
specific criterion for the San Joaquin River, mouth of Merced to
Vernalis; therefore, this section does not apply to these waters.
q. This criterion is expressed in the total recoverable form. This
criterion was promulgated for specific waters in California in the NTR
and was promulgated in the total recoverable form. The specific waters
to which the NTR criterion applies include: Waters of the San Francisco
Bay upstream to and including Suisun Bay and the Sacramento-San Joaquin
Delta; and waters of Salt Slough, Mud Slough (north) and the San Joaquin
River, Sack Dam to Vernalis. This criterion does not apply instead of
the NTR for these waters. This criterion applies to additional waters of
the United States in the State of California pursuant to 40 CFR
131.38(c). The State of California adopted and EPA approved a site-
specific criterion for the Grassland Water District, San Luis National
Wildlife Refuge, and the Los Banos State Wildlife Refuge; therefore,
this criterion does not apply to these waters.
r. These criteria were promulgated for specific waters in California
in the NTR. The specific waters to which the NTR criteria apply include:
Waters of the State defined as bays or estuaries including the San
Francisco Bay upstream to and including Suisun Bay and the Sacramento-
San Joaquin Delta. This section does not apply instead of the NTR for
these criteria.
s. These criteria were promulgated for specific waters in California
in the NTR. The specific waters to which the NTR criteria apply include:
Waters of the Sacramento-San Joaquin Delta and waters of the State
defined as inland ( i.e., all surface waters of the State not bays or
estuaries or ocean) that include a MUN use designation. This section
does not apply instead of the NTR for these criteria.
t. These criteria were promulgated for specific waters in California
in the NTR. The specific waters to which the NTR criteria apply include:
Waters of the State defined as bays and estuaries including San
Francisco Bay upstream to and including Suisun Bay and the Sacramento-
San Joaquin Delta; and waters of the State defined as inland (i.e., all
[[Page 421]]
surface waters of the State not bays or estuaries or ocean) without a
MUN use designation. This section does not apply instead of the NTR for
these criteria.
u. PCBs are a class of chemicals which include aroclors 1242, 1254,
1221, 1232, 1248, 1260, and 1016, CAS numbers 53469219, 11097691,
11104282, 11141165, 12672296, 11096825, and 12674112, respectively. The
aquatic life criteria apply to the sum of this set of seven aroclors.
v. This criterion applies to total PCBs, e.g., the sum of all
congener or isomer or homolog or aroclor analyses.
w. This criterion has been recalculated pursuant to the 1995
Updates: Water Quality Criteria Documents for the Protection of Aquatic
Life in Ambient Water, Office of Water, EPA-820-B-96-001, September
1996. See also Great Lakes Water Quality Initiative Criteria Documents
for the Protection of Aquatic Life in Ambient Water, Office of Water,
EPA-80-B-95-004, March 1995.
x. The State of California has adopted and EPA has approved site
specific criteria for the Sacramento River (and tributaries) above
Hamilton City; therefore, these criteria do not apply to these waters.
General Notes to Table in Paragraph (b)(1)
1. The table in this paragraph (b)(1) lists all of EPA's priority
toxic pollutants whether or not criteria guidance are available. Blank
spaces indicate the absence of national section 304(a) criteria
guidance. Because of variations in chemical nomenclature systems, this
listing of toxic pollutants does not duplicate the listing in Appendix A
to 40 CFR Part 423-126 Priority Pollutants. EPA has added the Chemical
Abstracts Service (CAS) registry numbers, which provide a unique
identification for each chemical.
2. The following chemicals have organoleptic-based criteria
recommendations that are not included on this chart: zinc, 3-methyl-4-
chlorophenol.
3. Freshwater and saltwater aquatic life criteria apply as specified
in paragraph (c)(3) of this section.
(2) Factors for Calculating Metals Criteria. Final CMC and CCC
values should be rounded to two significant figures.
(i) CMC = WER x (Acute Conversion Factor) x (exp{mA[lsqb]1n
(hardness)[rsqb]+bA{time} )
(ii) CCC = WER x (Chronic Conversion Factor) x
(exp{mC[ln(hardness)]+bC{time} )
(iii) Table 1 to paragraph (b)(2) of this section:
----------------------------------------------------------------------------------------------------------------
Metal mA bA mC bC
----------------------------------------------------------------------------------------------------------------
Cadmium......................................... 1.128 -3.6867 0.7852 -2.715
Copper.......................................... 0.9422 -1.700 0.8545 -1.702
Chromium (III).................................. 0.8190 3.688 0.8190 1.561
Lead............................................ 1.273 -1.460 1.273 -4.705
Nickel.......................................... 0.8460 2.255 0.8460 0.0584
Silver.......................................... 1.72 -6.52
Zinc............................................ 0.8473 0.884 0.8473 0.884
----------------------------------------------------------------------------------------------------------------
Note to Table 1: The term ``exp'' represents the base e exponential function.
(iv) Table 2 to paragraph (b)(2) of this section:
----------------------------------------------------------------------------------------------------------------
Conversion CF for CF a for
factor (CF) for freshwater CF for saltwater
Metal freshwater chronic saltwater chronic
acute criteria criteria acute criteria criteria
----------------------------------------------------------------------------------------------------------------
Antimony....................................... (d) (d) (d) (d)
Arsenic........................................ 1.000 1.000 1.000 1.000
Beryllium...................................... (d) (d) (d) (d)
Cadmium........................................ b 0.944 b 0.909 0.994 0.994
Chromium (III)................................. 0.316 0.860 (d) (d)
Chromium (VI).................................. 0.982 0.962 0.993 0.993
Copper......................................... 0.960 0.960 0.83 0.83
Lead........................................... b 0.791 b 0.791 0.951 0.951
Mercury........................................ ............... .............. .............. ..............
Nickel......................................... 0.998 0.997 0.990 0.990
Selenium....................................... ............... (c) 0.998 0.998
Silver......................................... 0.85 (d) 0.85 (d)
Thallium....................................... (d) (d) (d) (d)
Zinc........................................... 0.978 0.986 0.946 0.946
----------------------------------------------------------------------------------------------------------------
Footnotes to Table 2 of Paragraph (b)(2):
a Conversion Factors for chronic marine criteria are not currently available. Conversion Factors for acute
marine criteria have been used for both acute and chronic marine criteria.
b Conversion Factors for these pollutants in freshwater are hardness dependent. CFs are based on a hardness of
100 mg/l as calcium carbonate (CaCO3). Other hardness can be used; CFs should be recalculated using the
equations in table 3 to paragraph (b)(2) of this section.
[[Page 422]]
c Bioaccumulative compound and inappropriate to adjust to percent dissolved.
d EPA has not published an aquatic life criterion value.
Note to Table 2 of Paragraph (b)(2):
The term ``Conversion Factor'' represents the recommended conversion
factor for converting a metal criterion expressed as the total
recoverable fraction in the water column to a criterion expressed as the
dissolved fraction in the water column. See ``Office of Water Policy and
Technical Guidance on Interpretation and Implementation of Aquatic Life
Metals Criteria'', October 1, 1993, by Martha G. Prothro, Acting
Assistant Administrator for Water available from Water Resource Center,
USEPA, Mailcode RC4100, M Street SW, Washington, DC 20460 and the note
to Sec. 131.36(b)(1).
(v) Table 3 to paragraph (b)(2) of this section:
------------------------------------------------------------------------
Acute Chronic
------------------------------------------------------------------------
Cadmium..................... CF=1.136672--[(ln CF = 1.101672--[(ln
{hardness{time} ) {hardness{time} )(0
(0.041838)]. .041838)]
Lead........................ CF=1.46203--[(ln CF = 1.46203--[(ln
{hardness{time} )(0 {hardness{time} )(0
.145712)]. .145712)]
------------------------------------------------------------------------
(c) Applicability. (1) The criteria in paragraph (b) of this section
apply to the State's designated uses cited in paragraph (d) of this
section and apply concurrently with any criteria adopted by the State,
except when State regulations contain criteria which are more stringent
for a particular parameter and use, or except as provided in footnotes
p, q, and x to the table in paragraph (b)(1) of this section.
(2) The criteria established in this section are subject to the
State's general rules of applicability in the same way and to the same
extent as are other Federally-adopted and State-adopted numeric toxics
criteria when applied to the same use classifications including mixing
zones, and low flow values below which numeric standards can be exceeded
in flowing fresh waters.
(i) For all waters with mixing zone regulations or implementation
procedures, the criteria apply at the appropriate locations within or at
the boundary of the mixing zones; otherwise the criteria apply
throughout the water body including at the point of discharge into the
water body.
(ii) The State shall not use a low flow value below which numeric
standards can be exceeded that is less stringent than the flows in Table
4 to paragraph (c)(2) of this section for streams and rivers.
(iii) Table 4 to paragraph (c)(2) of this section:
------------------------------------------------------------------------
Criteria Design flow
------------------------------------------------------------------------
Aquatic Life Acute Criteria (CMC)......... 1 Q 10 or 1 B 3
Aquatic Life Chronic Criteria (CCC)....... 7 Q 10 or 4 B 3
Human Health Criteria..................... Harmonic Mean Flow
------------------------------------------------------------------------
Note to Table 4 of Paragraph (c)(2): 1. CMC (Criteria Maximum
Concentration) is the water quality criteria to protect against acute
effects in aquatic life and is the highest instream concentration of a
priority toxic pollutant consisting of a short-term average not to be
exceeded more than once every three years on the average.
2. CCC (Continuous Criteria Concentration) is the water quality
criteria to protect against chronic effects in aquatic life and is the
highest in stream concentration of a priority toxic pollutant consisting
of a 4-day average not to be exceeded more than once every three years
on the average.
3. 1 Q 10 is the lowest one day flow with an average recurrence
frequency of once in 10 years determined hydrologically.
4. 1 B 3 is biologically based and indicates an allowable exceedence
of once every 3 years. It is determined by EPA's computerized method
(DFLOW model).
5. 7 Q 10 is the lowest average 7 consecutive day low flow with an
average recurrence frequency of once in 10 years determined
hydrologically.
6. 4 B 3 is biologically based and indicates an allowable exceedence
for 4 consecutive days once every 3 years. It is determined by EPA's
computerized method (DFLOW model).
(iv) If the State does not have such a low flow value below which
numeric standards do not apply, then the criteria included in paragraph
(d) of this section apply at all flows.
(v) If the CMC short-term averaging period, the CCC four-day
averaging period, or once in three-year frequency is inappropriate for a
criterion or the site
[[Page 423]]
to which a criterion applies, the State may apply to EPA for approval of
an alternative averaging period, frequency, and related design flow. The
State must submit to EPA the bases for any alternative averaging period,
frequency, and related design flow. Before approving any change, EPA
will publish for public comment, a document proposing the change.
(3) The freshwater and saltwater aquatic life criteria in the matrix
in paragraph (b)(1) of this section apply as follows:
(i) For waters in which the salinity is equal to or less than 1 part
per thousand 95% or more of the time, the applicable criteria are the
freshwater criteria in Column B;
(ii) For waters in which the salinity is equal to or greater than 10
parts per thousand 95% or more of the time, the applicable criteria are
the saltwater criteria in Column C except for selenium in the San
Francisco Bay estuary where the applicable criteria are the freshwater
criteria in Column B (refer to footnotes p and q to the table in
paragraph (b)(1) of this section); and
(iii) For waters in which the salinity is between 1 and 10 parts per
thousand as defined in paragraphs (c)(3)(i) and (ii) of this section,
the applicable criteria are the more stringent of the freshwater or
saltwater criteria. However, the Regional Administrator may approve the
use of the alternative freshwater or saltwater criteria if
scientifically defensible information and data demonstrate that on a
site-specific basis the biology of the water body is dominated by
freshwater aquatic life and that freshwater criteria are more
appropriate; or conversely, the biology of the water body is dominated
by saltwater aquatic life and that saltwater criteria are more
appropriate. Before approving any change, EPA will publish for public
comment a document proposing the change.
(4) Application of metals criteria. (i) For purposes of calculating
freshwater aquatic life criteria for metals from the equations in
paragraph (b)(2) of this section, for waters with a hardness of 400 mg/l
or less as calcium carbonate, the actual ambient hardness of the surface
water shall be used in those equations. For waters with a hardness of
over 400 mg/l as calcium carbonate, a hardness of 400 mg/l as calcium
carbonate shall be used with a default Water-Effect Ratio (WER) of 1, or
the actual hardness of the ambient surface water shall be used with a
WER. The same provisions apply for calculating the metals criteria for
the comparisons provided for in paragraph (c)(3)(iii) of this section.
(ii) The hardness values used shall be consistent with the design
discharge conditions established in paragraph (c)(2) of this section for
design flows and mixing zones.
(iii) The criteria for metals (compounds 1--13 in
the table in paragraph (b)(1) of this section) are expressed as
dissolved except where otherwise noted. For purposes of calculating
aquatic life criteria for metals from the equations in footnote i to the
table in paragraph (b)(1) of this section and the equations in paragraph
(b)(2) of this section, the water effect ratio is generally computed as
a specific pollutant's acute or chronic toxicity value measured in water
from the site covered by the standard, divided by the respective acute
or chronic toxicity value in laboratory dilution water. To use a water
effect ratio other than the default of 1, the WER must be determined as
set forth in Interim Guidance on Determination and Use of Water Effect
Ratios, U.S. EPA Office of Water, EPA-823-B-94-001, February 1994, or
alternatively, other scientifically defensible methods adopted by the
State as part of its water quality standards program and approved by
EPA. For calculation of criteria using site-specific values for both the
hardness and the water effect ratio, the hardness used in the equations
in paragraph (b)(2) of this section must be determined as required in
paragraph (c)(4)(ii) of this section. Water hardness must be calculated
from the measured calcium and magnesium ions present, and the ratio of
calcium to magnesium should be approximately the same in standard
laboratory toxicity testing water as in the site water.
(d)(1) Except as specified in paragraph (d)(3) of this section, all
waters assigned any aquatic life or human health use classifications in
the Water Quality Control Plans for the various
[[Page 424]]
Basins of the State (``Basin Plans'') adopted by the California State
Water Resources Control Board (``SWRCB''), except for ocean waters
covered by the Water Quality Control Plan for Ocean Waters of California
(``Ocean Plan'') adopted by the SWRCB with resolution Number 90-27 on
March 22, 1990, are subject to the criteria in paragraph (d)(2) of this
section, without exception. These criteria apply to waters identified in
the Basin Plans. More particularly, these criteria apply to waters
identified in the Basin Plan chapters designating beneficial uses for
waters within the region. Although the State has adopted several use
designations for each of these waters, for purposes of this action, the
specific standards to be applied in paragraph (d)(2) of this section are
based on the presence in all waters of some aquatic life designation and
the presence or absence of the MUN use designation (municipal and
domestic supply). (See Basin Plans for more detailed use definitions.)
(2) The criteria from the table in paragraph (b)(1) of this section
apply to the water and use classifications defined in paragraph (d)(1)
of this section as follows:
------------------------------------------------------------------------
Water and use classification Applicable criteria
------------------------------------------------------------------------
(i) All inland waters of the United (A) Columns B1 and B2--all
States or enclosed bays and estuaries pollutants
that are waters of the United States (B) Columns C1 and C2--all
that include a MUN use designation. pollutants
(C) Column D1--all pollutants
----------------------------------------
(ii) All inland waters of the United (A) Columns B1 and B2--all
States or enclosed bays and estuaries pollutants
that are waters of the United States (B) Columns C1 and C2--all
that do not include a MUN use pollutants
designation. (C) Column D2--all pollutants
------------------------------------------------------------------------
(3) Nothing in this section is intended to apply instead of specific
criteria, including specific criteria for the San Francisco Bay estuary,
promulgated for California in the National Toxics Rule at Sec. 131.36.
(4) The human health criteria shall be applied at the State-adopted
10 (-6) risk level.
(5) Nothing in this section applies to waters located in Indian
Country.
(e) Schedules of compliance. (1) It is presumed that new and
existing point source dischargers will promptly comply with any new or
more restrictive water quality-based effluent limitations (``WQBELs'')
based on the water quality criteria set forth in this section.
(2) When a permit issued on or after May 18, 2000 to a new
discharger contains a WQBEL based on water quality criteria set forth in
paragraph (b) of this section, the permittee shall comply with such
WQBEL upon the commencement of the discharge. A new discharger is
defined as any building, structure, facility, or installation from which
there is or may be a ``discharge of pollutants'' (as defined in 40 CFR
122.2) to the State of California's inland surface waters or enclosed
bays and estuaries, the construction of which commences after May 18,
2000.
(3) Where an existing discharger reasonably believes that it will be
infeasible to promptly comply with a new or more restrictive WQBEL based
on the water quality criteria set forth in this section, the discharger
may request approval from the permit issuing authority for a schedule of
compliance.
(4) A compliance schedule shall require compliance with WQBELs based
on water quality criteria set forth in paragraph (b) of this section as
soon as possible, taking into account the dischargers' technical ability
to achieve compliance with such WQBEL.
[[Page 425]]
(5) If the schedule of compliance exceeds one year from the date of
permit issuance, reissuance or modification, the schedule shall set
forth interim requirements and dates for their achievement. The dates of
completion between each requirement may not exceed one year. If the time
necessary for completion of any requirement is more than one year and is
not readily divisible into stages for completion, the permit shall
require, at a minimum, specified dates for annual submission of progress
reports on the status of interim requirements.
(6) In no event shall the permit issuing authority approve a
schedule of compliance for a point source discharge which exceeds five
years from the date of permit issuance, reissuance, or modification,
whichever is sooner. Where shorter schedules of compliance are
prescribed or schedules of compliance are prohibited by law, those
provisions shall govern.
(7) If a schedule of compliance exceeds the term of a permit,
interim permit limits effective during the permit shall be included in
the permit and addressed in the permit's fact sheet or statement of
basis. The administrative record for the permit shall reflect final
permit limits and final compliance dates. Final compliance dates for
final permit limits, which do not occur during the term of the permit,
must occur within five years from the date of issuance, reissuance or
modification of the permit which initiates the compliance schedule.
Where shorter schedules of compliance are prescribed or schedules of
compliance are prohibited by law, those provisions shall govern.
(8) The provisions in this paragraph (e), Schedules of compliance,
shall expire on May 18, 2005.
[65 FR 31711, May 18, 2000, as amended at 66 FR 9961, Feb. 13, 2001]
Editorial Note: At 66 FR 9961, Feb. 13, 2001, Sec. 131.38 was
amended in the table to paragraph (b)(1) under the column heading for
``B Freshwater'' by revising the column headings for ``Criterion Maximum
Concentration'' and ``Criterion Continuous Concentration''; under the
column heading for ``C Saltwater'' by revising the column headings for
``Criterion Maximum Concentration'' and ``Criterion Continuous
Concentration''; and by revising entries ``23.'' and ``67.'', effective
Feb. 13, 2001. However, this is a photographed table and the amendments
could not be incorporated into the text. For the convenience of the
user, the amended text is set forth as follows:
Sec. 131.38 Establishment of Numeric Criteria for priority toxic
pollutants for the State of California.
* * * * *
(b)(1) * * *
[[Page 426]]
--------------------------------------------------------------------------------------------------------------------------------------------------------
A B Freshwater C Saltwater D Human health (10-6)
------------------------------------------------------------------------------------------------------------------------------- risk for carcinogens)
For consumption of:
Criterion Criterion Criterion Criterion -------------------------
CAS number maximum continous maximum continious Water & Organisms
Compound conc. conc. conc. conc. organisms only
([mu]g/L)d ([mu]g/L)d ([mu]g/L)d ([mu]g/L)d ([mu]g/L) ([mu]g/L)
B1 B2 C1 C2 D1 D2
--------------------------------------------------------------------------------------------------------------------------------------------------------
* * * * * * *
23. Chlorodibromomethane..................................... 124481 ........... ........... ........... ........... a,c 0.41 a,c 34
* * * * * * *
67. Bis(2-Chloroisopropyl)Ether.............................. 108601 ........... ........... ........... ........... a 1,400 a,t 170,000
* * * * * * *
--------------------------------------------------------------------------------------------------------------------------------------------------------
Footnotes to table in Paragraph (b)(1):
* * * * * * *
a Criteria revised to reflect the Agency q1* or RfD, as contained in the Integrated Risk Information System (IRIS) as of October 1, 1996. The fish
tissue bioconcentration factor (BCF) from the 1980 documents was retained in each case.
c Criteria are based on carcinogenicity of 10-6 risk.
d Criteria Maximum Concentration (CMC) equals the highest concentration of a pollutant to which aquatic life can be exposed for a short period of time
without deleterious effects. Criteria Continuous Concentration (CCC) equals the highest concentration of a pollutant to which aquatic life can be
exposed for an extended period of time (4 days) without deleterious effects. [mu]g/L equals micrograms per liter.
* * * * * * *
t These criteria were promulgated for specific waters in California in the NTR. The specific waters to which the NTR criteria apply include: Waters of
the State defined as bays and estuaries including San Francisco Bay upstream to and including Suisun Bay and the Sacramento-San Joaquin Delta; and
waters of the State defined as inland (i.e., all surface waters of the State not bays or estuaries or ocean) without a MUN use designation. This
section does not apply instead of the NTR for these criteria.
[[Page 427]]
* * * * *