vvEPA
United States           Office of Water
Environmental Protection        Office of Science and Technology  2006
Agency             (4304T)
                   Recommended
        Water Quality Criteria

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                   NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR PRIORITY TOXIC POLLUTANTS
8a
8b
        Priority Pollutant
1      Antimony

2      Arsenic
6      Copper

7      Lead
Mercury
Methylmercury
9     Nickel

10    Selenium
                           CAS
                           Number
                   Freshwater
                CMC         CCC
                (• g/L)        (• g/L)
                             7440360
                             7440382     340 A.D.K
                                   7440417
 7440508

 7439921

 7439976
22967926
13 D,E,K,cc


65 D,E,bb,gg


1.4 D,K,hh
                             7440020     470o,E,K

                             7782492       L.R-T
                                    Saltwater
                              CMC         CCC
                              (• g/L)         (• g/L)
                                            Human Health
                                          For Consumption of:
                                         Water +     Organism
                                         Organism     Only
                                         (• g/L)       (• g/L)
                                                                      5 6
                                                                      640]
                            150 A.D.K
4 Cadmium

5a Chromium (III)
5h rVirnmiiim fVTl
7440439 2.0D,E,K,bb

16065831 570D.E.K
18WI9QQ Ifinii-
0.25 D,E,K,bl

74 D.E.K
11 r,ic
9.0D,E,K,cc

2.5D,E,bb,gg
     ^m
0.77D,K,hh



 52 D.E.K



   5.0 T
                              69 A,D,bb
                                                                             40 D,bb
                                           74 D.bb
                                                                            290 o.bb.dd
                              36 A,D,bb
                                                                                     8.8o,bb
                                                                                                      0.018 C.M.S    0.14c,M,s
                        FR Cite/
                        Source
                        65FR66443

                        65FR31682
                        57FR60848

                        65FR31682

                      EPA-822-R-01-001
                        65FR31682
                                            8.2o,bb
                                                                                    71 D.bb.dd
610B
                                                                                                         170 z
4,600 B
                                                                                                              4200
                                                                                                                                EPA820/B-96-
                                                                                                                                        001
                                                                                                                                65FR31682
                        65FR31682

                            31682

                        65FR31682

                        62FR42160
          0.3 mg/kg J     EPA823-R-01-
                               001
65FR31682

62FR42160
65FR31682
65FR66443
11
Silver
 7440224
 3.2D.E.G
                1.9D.G
                        65FR31682

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                   NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR PRIORITY TOXIC POLLUTANTS
        Priority Pollutant
12    Thallium

13    Zinc
      Asbestos
16    2,3,7,8-TCDD (Dioxin)
17    Acrolein

18    Acrylonitrile

19    Benzene


20    Bromoform

21    Carbon Tetrachloride

22    Chlorobenzene

23    Chlorodibromomethane

24    Chloroethane
CAS
Number
  7440280
  1332214


  1746016
   107028

   107131

    71432


    75252

    56235

   108907

   124481

    75003
   Freshwater
CMC        CCC
(• g/L)        (• g/L)
      Saltwater
CMC        CCC
(• g/L)        (• g/L)
              Human Health
           For Consumption of:
          Water +     Organism
           Organism     Only
           (• g/L)       (• g/L)
  7440666     120 D.E.K
                                    57125      22K.Q
            120 D.E.K
90 o.bb
                                                                             Q,bb
81 D,bb
                                                          Q,bb
FR Cite/
 Source
24
00 u
•
tOjj
illion
rs/L i
E-9c
90
51 B,C
2 B,C
! B,C
3 B,C
)z,u,
OB.C
0.47
26,000 u
140 jj


5.1E-9c
290
0.25 B,C
51B.C
140 B,C
1.6 B,C
l,600u
13B.C
68FR75510
65FR31682
65FR66443
EPA820/B-96-
001
57FR60848
68FR75510
57FR60848

65FR66443
65FR66443
65FR66443
IRIS 01/1 9/00
&65FR66443
65FR66443
65FR66443
68FR75510
65FR66443

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                   NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR PRIORITY TOXIC POLLUTANTS
25

26

27

28

29

30

31

32

33
"
35

36

37

38
        Priority Pollutant
2-Chloroethylvinyl Ether

Chloroform

Dichlorobromomethane

1,1 -Dichloroethane

1,2-Dichloroethane
1,1 -Dichloroethy lene

1,2-Dichloropropane

1,3 -Dichloropropene

Ethylbenzene

Methyl Bromide

Methyl Chloride

Methylene Chloride

1,1,2,2-Tetrachloroethane

Tetrachloroethylene
      Toluene

      1,2-Trans-Dichloroethylene
                           CAS
                           Number
110758

 67663

 75274

 75343

107062
 75354
 78875

542756

100414

 74839

 74873

 75092

 79345

127184

108883

156605
                 Freshwater
             CMC         CCC
             (• g/L)        (• g/L)
      Saltwater
CMC         CCC
(• g/L)         (• g/L)
    Human Health
 For Consumption of:
Water +     Organism
 Organism     Only
 (• g/L)       (• g/L)
                          0.38 B,C
                            330
               37B,c

               7,100
FR Cite/
 Source
                                                  62FR42160

                                                  65FR66443
65FR66443

68FR75510
                          0.50 B,C

                           0.34 c

                            530
               15B.C

               21 c

               2,100
                           4.6 B,C

                          0.17B.C

                           0.69 c
              590 B,C

              4.0 B,C

               3.3 c
                                                                                                1,300 z
                                       15,000

                                       10,000
65FR66443

68FR75510

68FR75510

65FR66443

65FR31682
65FR66443

65FR66443

65FR66443

68FR75510

68FR75510

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                   NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR PRIORITY TOXIC POLLUTANTS
43
44

45

46

47
49
51

52

53
        Priority Pollutant
1,1,1 -Trichloroethane

1,1,2-Trichloroethane

Trichloroethylene
Vinyl Chloride

2-Chlorophenol
2,4-Dichlorophenol

2,4-Dimethylphenol

2-Methyl-4,6-Dinitrophenol

2,4-Dinitrophenol

 -Nitrophenol

4-Nitrophenol

3 -Methyl-4-Chlorophenol

Pentachlorophenol
54    Phenol

55    2,4,6-Trichlorophenol

56    Acenaphthene
                           CAS
                           Number
 71556

 79005

 79016

 75014

 95578

120832
                              108952

                               88062

                               83329
                 Freshwater
             CMC         CCC
             (• g/L)         (• g/L)
      Saltwater
CMC         CCC
(• g/L)         (• g/L)
             Human Health
           For Consumption of:
          Water +     Organism
          Organism     Only
          (• g/L)       (• g/L)
                          0.59B.C

                           2.5 c
                         16B.C

                         30 c
                         0.025 c,kk    2.4 c,kk

                           8lB,U       150 B,U
                           77 B,U      290 B,U
                                                                   380 B       850 B,U
FR Cite/
 Source
65FR31682

65FR66443

65FR66443

68FR75510

65FR66443

65FR66443

65FR66443

65FR66443

65FR66443
                                                19F.K
                           15F.K
 13 bb
7.9 bb
                                                                                                      0.27 B,C
                                                                                                            3.0 B,C,H
                                                                 21,000 B,U    1,700,000 B,U

                                                                   1.4B,c      2.4B,c,u

                                                                  670 B,U      990 B,U
65FR31682
65FR66443
                                                   65FR66443

                                                   65FR66443

                                                   65FR66443

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                   NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR PRIORITY TOXIC POLLUTANTS
57

58

59

60

61

62

63

64

65
67

68

69

70

71

72
        Priority Pollutant
Acenaphthylene

Anthracene

Benzidine

Benzo(a)Anthracene

Benzo(a)Pyrene
Benzo(b)Fluoranthene
Benzo(ghi)Perylene

Benzo(k)Fluoranthene

Bis(2-Chloroethoxy)Methane

 is(2-Chloroethyl)Ether

Bis(2-Chloroisopropyl)Ether

Bis(2-Ethylhexyl)Phthalatex

4-Bromophenyl Phenyl Ether

Butylbenzyl Phthalatew

2-Chloronaphthalene

4-Chlorophenyl Phenyl Ether
                           CAS
                           Number
208968

120127

 92875

 56553

 50328
                 Freshwater
             CMC         CCC
             (• g/L)        (• g/L)
      Saltwater
CMC         CCC
(• g/L)        (• g/L)
    Human Health
 For Consumption of:
Water +     Organism
 Organism     Only
 (• g/L)       (• g/L)
                           8,300 B     40,000 B

                         0.000086 B,C   0.00020 B,C
                                   ^^^^H
                         0.0038 B,C    0.018 B,C

                         0.0038 B,C    0.018 B,C
                                                                  0.0038 B,C     0.018 B,C
FR Cite/
 Source
                          65FR66443

                          65FR66443

                          65FR66443

                          65FR66443

                          65FR66443
                                                                  0.0038 B,C     0.018 B,C



                                                                    330 B,C     0.53 B,C

                                                                    1,400 B      65,000 B

                                                                    1.2 B,C       2.2 B,C
                                                   65FR66443
                                                   65FR66443

                                                   65FR66443
                                                                                            65FR66443

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                   NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR PRIORITY TOXIC POLLUTANTS
73

74

75

76

77

78

79

80

81
.
83

84

85

86
        Priority Pollutant
Chrysene

Dibenzo(a,h)Anthracene

1,2-Dichlorobenzene

1,3 -Dichlorobenzene

1,4-Dichlorobenzene

3,3 '-Dichlorobenzidine

Diethyl Phthalatew

Dimethyl Phthalat

Di-n-Butyl Phthalatew

2,4-Dmitrotoluene

2,6-Dmitrotoluene

Di-n-Octyl Phthalate

1,2-Diphenylhydrazine

Fluoranthene
87    Fluorene

88    Hexachlorobenzene
                           CAS
                           Number
218019

 53703

 95501

541731

106467

 91941

 84662

131113

 84742
                 Freshwater
             CMC         CCC
             (• g/L)        (• g/L)
      Saltwater
CMC         CCC
(• g/L)         (• g/L)
    Human Health
 For Consumption of:
Water +     Organism
 Organism     Only
 (• g/L)       (• g/L)
                         0.0038 B,C    0.018 B,C

                         0.0038 B,C    0.018 B,C

                            420        1,300
                            63
                190
FR Cite/
 Source
65FR66443

65FR66443

68FR75510

65FR66443

68FR75510
                          0.021 B,C
                          17,000 B

                          270,000

                          2,000 B
                         ^^m
                           O.llc
             0.028 B,C

             44,000 B

             1,100,000

              4,500 B

                 l-c
65FR66443

65FR66443

65FR66443

65FR66443

65FR66443
                                                                                              0.00028 B,C  0.00029 B,C
                                                                                           65FR66443

                                                                                           65FR66443

                                                                                           65FR66443

                                                                                           65FR66443

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                   NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR PRIORITY TOXIC POLLUTANTS
89

90

91

92

93

94

95

96

97
        Priority Pollutant
                           CAS
                           Number
                 Freshwater
             CMC         CCC
             (• g/L)        (• g/L)
      Saltwater
CMC         CCC
(• g/L)         (• g/L)
Hexachlorobutadiene              87683

Hexachlorocyclopentadiene        77474

Hexachloroethane                67721

Ideno(l,2,3-cd)Pyrene            193395

Isophorone                      78591
    Human Health
 For Consumption of:
Water +     Organism
 Organism     Only
 (• g/L)       (• g/L)
                                                                  0.44 B,C       18 B,C

                                                                              l,100u

                                                                   1.4B,c      3.3 B,C
                                                                 0.0038 B,C     0.018 B,C

                                                                   35 B,C       960 B,C
FR Cite/
 Source
                                                   65FR66443

                                                   68FR75510

                                                   65FR66443

                                                   65FR66443

                                                   65FR66443
99

100
Naphthalene
 91203
Nitrobenzene

N-Nitrosodimethylamine

N-Nitrosodi-n-Propylamine

N-Nitrosodiphenylamine

Phenanthrene

Pyrene
101    1,2,4-Trichlorobenzene

102    Aldrin



103    alpha-BHC
      ^H
104    beta-BH(
 98953

 62759

621647

 86306

 85018

129000

120821

309002
                              319846

                              319857
                            17 B

                         0.00069 B,C

                         0.0050 B,C

                           3.3 B,C
                                                                                               0.000049     0.000050
                                                                                                              B,C
                                                                 0.0026 B,C    0.0049 B,C

                                                                 0.0091 B,C     0.017 B,C
                          65FR66443

                          65FR66443

                          65FR66443

                          65FR66443
                                                   65FR66443

                                                   68FR75510

                                                   65FR31682
                                                   65FR66443

                                                   65FR66443

                                                   65FR66443

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                   NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR PRIORITY TOXIC POLLUTANTS
        Priority Pollutant
105   gamma-BHC (Lindane)


106   delta-BHC

107   Chlordane
CAS
Number
   Freshwater
CMC        CCC
(• g/L)        (• g/L)
109   4,4'-DDE

110   4,4'-DDD

111   Dieldrin
112   alpha-Endosulfan
113   beta-Endosulfan


114   Endosulfan Sulfate

115   Endrin
    58899      0.95 K
      Saltwater
 CMC         CCC
 (• g/L)        (• g/L)
                           0.16G
                            Human Health
                         For Consumption of:
                        Water +     Organism
                        Organism     Only
                        (• g/L)       (• g/L)
                                      FR Cite/
                                       Source
   319868

    57749      2.4 G
               0.24 K
   959988     0.22 G,Y
 33213659     0.22 G,Y


  1031078

    72208     0.086 K
            0.056 K,O
            0.056 G,Y

            0.056 G,Y


           •
            0.036 K,O
                           0.09 G        0.004 G.aa                              65FR31682
                                                   0.00080 B,C  0.00081 B,C    65FR66443
                                                                                        O.OOlG,aa,u                             65FR31682
                                                                                                     0.00022 B,C  0.00022 B,C    65FR66443
                         0.00022 B,C  0.00022 B,C    65FR66443

                         0.0003 IB.C  0.0003 IB.C    65FR66443

                                                   65FR31682
                          0.000052    0.000054     65FR66443
                             B,C          B,C
0.71 G
0.034 G,Y
0.034 G,Y
 0.037 G
0.0019 G,a
            0.0087 G,Y

            0.0087 G,Y


           ^
            0.0023 G.aa
                                                                                                       62 B
                                                                                  89i
                            62 B
                                                                                                       0.059
                           89 B
                                                                                  0.060
                                      65FR31682
                                      65FR66443
65FR31682
65FR66443

65FR66443

65FR31682
68FR75510

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                     NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR PRIORITY TOXIC POLLUTANTS
        Prioritv Pollutant
CAS
Number
      Freshwater
  CMC          CCC
  (• g/L)         (• g/L)
                        Saltwater
                  CMC         CCC
                  (• g/L)         (• g/L)
117    Heptachlor
118    Heptachlor Epoxide
    76448
  1024573
 0.52 G
0.52 G,V
119    Polychlorinated Biphenyls
       PCBs:
120    Toxaphene
  8001352
  0.73
 0.0038 G,a
0.0038 G.V.aa
 0.053 G
0.0036 G,a
0.053 G,V      0.0036 G.V.aa
                               Human Health
                            For Consumption of:
                           Water +     Organism
                            Organism     Only
                            (• g/L)       (• g/L)
                                                                                                              0.000079     0.000079
                                                                                                                 B,C           B,C
                                                                                                              0.000039     0.000039
                                         FR Cite/
                                          Source
65FR31682
65FR66443


65FR31682
65FR66443
                              0.014N,aa
                                              0.03 N.aa
                                                                          0.000064     0.000064
                                                                            B,C,N         B,C,N
 0.0002 aa
  0.21
0.0002 aa
                                                                                                             0.00028B,C   0.00028 B,C
                                                                        65FR31682
                                                                        65FR66443
65FR31682
65FR66443
Footnotes:
A This recommended water quality criterion was derived from data for arsenic (III), but is applied here to total arsenic, which might imply that arsenic (III) and
   arsenic  (V) are equally toxic to aquatic life and that their toxicities are additive. In the arsenic criteria document (EPA 440/5-84-033, January 1985), Species
   Mean Acute Values are given for both arsenic (III) and arsenic (V) for five species and the ratios of the SMAVs for each species range from 0.6 to 1.7.
   Chronic values are available for both arsenic (III) and arsenic (V) for one species; for the fathead minnow, the chronic value for arsenic (V) is 0.29 times the
   chronic value for arsenic (III).  No data are known to be available concerning whether the toxicities of the forms of arsenic to aquatic organisms are additive.
B This criterion has been revised to reflect The Environmental Protection Agency's ql* or RfD, as contained in the Integrated Risk Information System (IRIS)
   as of May 17, 2002. The fish tissue bioconcentration factor (BCF) from the 1980 Ambient Water Quality Criteria document was retained in each case.
C This criterion is 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).
D Freshwater and saltwater criteria for metals are expressed in terms of the dissolved metal in the water column.  The recommended water quality criteria
    value was calculated by using the previous 304(a) aquatic life criteria expressed in terms of total recoverable metal, and multiplying it by a conversion factor
    (CF). The term "Conversion Factor"  (CF) 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. (Conversion Factors for saltwater CCCs are not currently
   available.  Conversion factors derived for saltwater CMCs have been used for both saltwater CMCs and CCCs). 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

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                     NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR PRIORITY TOXIC POLLUTANTS

   Water, available from the Water Resource center, USEPA, 401 M St., SW, mail code RC4100, Washington, DC 20460; and 40CFR§131.36(b)(l).
   Conversion Factors applied in the table can be found in Appendix A to the Preamble- Conversion Factors for Dissolved Metals.
E  The freshwater criterion for this metal is expressed as a function of hardness (mg/L) in the water column. The value given here corresponds to a hardness of
   100 mg/L. Criteria values for other hardness may be calculated from the following: CMC (dissolved) = exp{mA [ln(hardness)]+ bA} (CF), or CCC
   (dissolved) = exp{mc [In (hardness)]+ bc} (CF) and the parameters specified in Appendix B- Parameters for Calculating Freshwater Dissolved Metals Criteria
   That Are Hardness-Dependent.
F  Freshwater aquatic life values for pentachlorophenol are expressed as a function of pH, and are calculated as follows: CMC = exp(1.005(pH)-4.869);
    CCC = exp(1.005(pH)-5.134).  Values displayed in table correspond to a pH of 7.8.
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 (EPA 440/5-80-
   052), Hexachlorocyclohexane (EPA 440/5-80-054), Silver (EPA 440/5-80-071).  The Minimum Data 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  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 the calculation of a criterion, even though
   the results of such a calculation were not shown in the document.
I  This criterion for asbestos is the Maximum Contaminant Level (MCL) developed under the Safe Drinking Water Act (SDWA).
J  This fish tissue residue criterion for methylmercury is based on a total fish consumption rate of 0.0175 kg/day.
K  This recommended criterion is based on a 304(a) aquatic life criterion that was  issued in the 1995 Updates:  Water Quality Criteria Documents for the
   Protection of Aquatic Life in Ambient Water, (EPA-820-B-96-001, September 1996). This value was derived using the GLI Guidelines (60FR15393-15399,
   March 23, 1995; 40CFR132 Appendix A); the difference between the 1985 Guidelines and the GLI Guidelines are explained on page iv of the 1995 Updates.
   None of the decisions concerning the derivation of this criterion were affected by  any considerations that are specific to the Great Lakes.
L  The CMC =  l/[(f I/CMC 1) + (f2/CMC2)] where f 1 and f2 are the fractions of total selenium that are treated as selenite and selenate, respectively, and CMC1
   and CMC2 are 185.9  • g/1 and 12.82 • g/1, respectively.
M EPA is currently reassessing the criteria for arsenic.
N  This criterion applies to total pcbs, (e.g., the sum of all congener or all isomer or homolog or Aroclor analyses.)
O  The derivation of the CCC for this pollutant (Endrin) did not consider exposure through the diet, which is probably important for aquatic life occupying
   upper trophic levels.
P  Although a new RfD is available in IRIS, the surface water criteria will not be revised until the National Primary Drinking Water Regulations: Stage 2
   Disinfectants and Disinfection Byproducts Rule (Stage 2 DBPR) is completed,  since public comment on the relative  source contribution (RSC) for chloroform
   is anticipated.
Q  This recommended water quality criterion is expressed as • g free cyanide (as CN)/L.
R  This value for selenium was announced (61FR58444-58449, November 14, 1996) as a proposed GLI 303(c) aquatic life criterion. EPA is currently working
   on this criterion and so this value might change substantially in the near future.
S  This recommended water quality criterion for arsenic refers to the inorganic form only.

                                                                      10

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                     NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR PRIORITY TOXIC POLLUTANTS

T  This recommended water quality criterion for selenium is expressed in terms of total recoverable metal in the water column. It is scientifically acceptable to
   use the conversion factor (0.996- CMC or 0.922- CCC) that was used in the GLI to convert this to a value that is expressed in terms of dissolved metal.
U  The organoleptic effect criterion is more stringent than the value for priority toxic pollutants.
V  This value was derived from data for heptachlor and the criteria document provides insufficient data to estimate the relative toxicities of heptachlor and
   heptachlor epoxide.
W Although EPA has not published a completed criteria document for butylbenzyl phthalate it is EPA's understanding that sufficient data exist to allow
   calculation of aquatic criteria.  It is anticipated that industry intends to publish in the peer reviewed literature draft aquatic life criteria generated in accordance
   with EPA Guidelines.  EPA will review such criteria for possible issuance as national WQC.
X  There is a full set of aquatic life toxicity  data that show that DEHP is not toxic to aquatic organisms at or below its solubility limit.
Y  This value was derived from data for endosulfan and is most appropriately applied to the sum of alpha-endosulfan and beta-endosulfan.
Z  A more stringent MCL has been issued by EPA. Refer to drinking water regulations (40 CFR 141) or Safe Drinking Water Hotline (1-800-426-4791) for
    values.
aa This criterion is based on a 304(a) aquatic life criterion issued in 1980 or 1986, 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), Endrin (EPA 440/5-80-047), Heptachlor (EPA 440/5-80-052), Polychlorinated
   biphenyls (EPA 440/5-80-068), Toxaphene (EPA 440/5-86-006). This CCC is currently based on the Final Residue Value (FRY) procedure. Since the
   publication of the Great Lakes Aquatic Life Criteria Guidelines in 1995  (60FR15393-15399, March 23, 1995), the Agency no longer uses the Final Residue
   Value procedure for deriving CCCs for new or revised 304(a) aquatic life criteria. Therefore, the Agency anticipates that future revisions of this CCC will not
   be based on the FRY procedure.
bb This water quality criterion is based on a 304(a) aquatic life criterion that was derived using the 1985 Guidelines (Guidelines for Deriving Numerical National
   Water Quality Criteria for the Protection of Aquatic Organisms and Their Uses, PB85-227049, January 1985) and was  issued in one of the  following criteria
   documents: Arsenic (EPA 440/5-84-033), Cadmium (EPA-822-R-01-001), Chromium (EPA 440/5-84-029), Copper (EPA 440/5-84-031), Cyanide (EPA
   440/5- 84-028), Lead (EPA 440/5-84-027), Nickel (EPA 440/5-86-004), Pentachlorophenol (EPA 440/5-86-009), Toxaphene, (EPA 440/5-86-006), Zinc
   (EPA 440/5-87- 003).
cc When the concentration of dissolved  organic carbon is elevated, copper is  substantially less toxic and use of Water-Effect Ratios might be appropriate.
dd The selenium criteria document (EPA 440/5-87-006, September 1987) provides that if selenium is as toxic to saltwater fishes in the field as  it is to freshwater
   fishes in the field, the status of the fish community should be monitored whenever the concentration of selenium exceeds 5.0 • g/L  in salt water because the
   saltwater CCC does not take into account uptake via the food chain.
ee This recommended water quality criterion was derived on page 43 of the mercury criteria document (EPA 440/5-84-026, January 1985). The saltwater CCC
   of 0.025 ug/L given on page 23 of the criteria document is based on the Final Residue Value procedure in the 1985 Guidelines. Since the publication of the
   Great Lakes Aquatic Life Criteria Guidelines in 1995 (60FR15393-15399, March 23, 1995), the Agency no longer uses the Final Residue Value procedure for
   deriving CCCs for new or revised 304(a) aquatic life criteria.
ff  This recommended water quality criterion was derived mAmbient Water Quality Criteria Saltwater  Copper Addendum (Draft, April 14, 1995) and was
   promulgated  in the Interim final National Toxics Rule (60FR22228-222237, May 4, 1995).
gg EPA is actively working on this criterion and so this recommended water quality criterion may change substantially in the near future.
hh This recommended water quality criterion was derived from data for inorganic mercury  (II), but is applied here to total mercury.  If a substantial portion of the
   mercury in the water column is methylmercury, this criterion will probably be under protective. In addition, even though inorganic mercury is converted to

                                                                       11

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                    NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR PRIORITY TOXIC POLLUTANTS

   methylmercury and methylmercury bioaccumulates to a great extent, this criterion does not account for uptake via the food chain because sufficient data were
   not available when the criterion was derived.
ii  This criterion applies to DDT and its metabolites (i.e., the total concentration of DDT and its metabolites should not exceed this value).
jj  This recommended water quality criterion is expressed  as total cyanide, even though the IRIS RFD we used to derive the criterion is based on free cyanide.
   The multiple forms of cyanide that are present in ambient water have significant differences in toxicity due to their differing abilities to liberate the CN-
   moiety. Some complex cyanides require even more extreme conditions than refluxing with sulfuric acid to liberate the CN-moiety.  Thus, these complex
   cyanides are expected to have little or no 'bioavailability' to humans. If a substantial fraction of the cyanide present in a water body is present in a complexed
   form (e.g., Fe4[Fe(CN)6]3), this criterion may be over conservative.
kk This recommended water quality criterion was derived using the cancer slope factor of 1.4 (LMS exposure from birth).
                                                                      12

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                   NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR NON PRIORITY POLLUTANTS
     Non Priority Pollutant
1    Alkalinity

2    Aluminum pH 6.5 - 9.0

3    Ammonia
                         CAS
                         Number
              Freshwater
            CMC      CCC
           (• g/L)      (• g/L)
              Saltwater
           CMC      CCC
           (• g/L)      (• g/L)
                            Human Health
                          For Consumption of:
                       Water +      Organism
                     Organism (• g/L) Only (• g/L)
                          7429905   750 G,I
                     20000 F

                     87 G,I,L
                          7664417   FRESHWATER CRITERIA ARE pH, Temperature and Life-stage DEPENDENT - SEE
                                                              DOCUMENT   D
                                         SALTWATER CRITERIA ARE pH AND TEMPERATURE DEPENDENT
                                          FR
                                       Cite/Source
                                                              Gold Book

                                                             53FR33178
                                                                                  EPA822-R-
                                                                                     99-014
                                                                                                                 EPA440/5-
                                                                                                                     88-004
     Aesthetic Qualities

     Bacteria

     Barium

     Boron

     Chloride

     Chlorine

10   Chlorophenoxy Herbicide
     (2,4,5,-TP)
                                                  NARRATIVE STATEMENT- SEE DOCUMENT

                                       FOR PRIMARY RECREATION AND SHELLFISH USES - SEE DOCUMENT

                                                                                 1,000 A
                                                  NARRATIVE STATEMENT- SEE DOCUMENT

                         16887006  860000 G   230000 G

                          7782505
            19
  11
  13
  7.5
                            93721
11


12

,3
Chlorophenoxy Herbicide
(2,4-D)
Chloropyrifos

Color
2921882    0.083 G
0.041 G
0.011 G
0.0056 G
 Gold Book

 Gold Book

 Gold Book

 Gold Book

53FR19028

 Gold Book

 Gold Book
                       NARRATIVE STATEMENT- SEE DOCUMENT F
 Gold Book

 Gold Book
                                                            13

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                    NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR NON PRIORITY POLLUTANTS
     Non Priority Pollutant
CAS
Number
14   Demeton
15   Ether, Bis( Chloromethyl)

16   Gases, Total Dissolved

17   Guthion
  8065483

   542881
    86500
   Freshwater
CMC      CCC
(• g/L)      (• g/L)
             Saltwater
          CMC      CCC
          (• g/L)      (• g/L)
       Human Health
     For Consumption of:
  Water +      Organism
Organism (• g/L)  Only (• g/L)
           0.1 F                    0.1 F

                                            0.00010 E,H    0.00029 E,H

            NARRATIVE STATEMENT - SEE DOCUMENT  F

           0.01 F                  0.01 F
18   Hardness

19   Hexachlorocyclo-hexane-        319868
     Technical

20   Iron                        7439896



22   Manganese                   7439965



24   Mirex                       2385855

25   Nitrates                    14797558

26   Nitrosamines

27   Dinitrophenols               25550587
                           NARRATIVE STATEMENT- SEE DOCUMENT

                                                             0.0123
                        1000 F
                        0.03 F

                        0.001 F
                                  0.03 F

                                  0.001 F
                                   300 A

                                   •
                                   50A,O

                                  100 A,C


                                  10,000 A

                                   0.0008
                                                              69
                                                              0.0414
                                                                            100 A
                                                                             1.24
                                                               5300
                                                      FR
                                                  Cite/Source
                                                               Gold Book

                                                               65FR66443

                                                               Gold Book

                                                               Gold Book

                                                               Gold Book

                                                               Gold Book
                               Gold Book

                               Gold Book

                               Gold Book

                               Gold Book

                               Gold Book

                               Gold Book

                               Gold Book

                               65FR66443

                               71FR9337

                               65FR66443

                               Gold Book
28   Nonylphenol

29   Nitrosodibutylamine,N

30   Nitrosodiethylamine,N
  1044051

   924163

    55185
 28
6.6
7.0
1.7
                                             0.0063 A,H

                                             0.0008 A,H
                                                 0.22 A,H

                                                 1.24A,H
                                                                14

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                   NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR NON PRIORITY POLLUTANTS
     Non Priority Pollutant
31   Nitrosopyrrolidine,N

32   Oil and Grease

33
„
35

36

37

38

39
Oxygen, Dissolved
Freshwater
Oxygen, Dissolved
Saltwater

Diazinon

Parathion

Pentachlorobenzene

pH

Phosphorus Elemental
  •
Nutrients
                          CAS
                          Number
                            930552
               Freshwater
            CMC      CCC
            (• g/L)      (• g/L)
                                                                Saltwater
                                                             CMC      CCC
                                                             (• g/L)      (• g/L)
       Human Health
     For Consumption of:
  Water +      Organism
Organism (• g/L)  Only (• g/L)
                                                          0.016 H

                       NARRATIVE STATEMENT - SEE DOCUMENT  F
                                                                                                     34 H
                           7782447
               WARMWATER AND COLD WATER MATRIX - SEE DOCUMENT  N

                                SALTWATER - SEE DOCUMENT
 40  Solids Dissolved and Salinity
'
49
42

43
Solids Suspem
Turbidity
Sulfide-Hydrogen Sulfide

Tainting Substances
           See EPA's Ecoregional criteria for Total Phosphorus, Total Nitrogen, Chlorophyll a and
             Water Clarity (Secchi depth for lakes; turbidity for streams and rivers) (& Level III
                                      Ecoregional criteria)

                                                         250,000 A

                       NARRATIVE STATEMENT - SEE DOCUMENT  F
7783064
44   Temperature
                                                  2.0 F                   2.0 F

                                                     NARRATIVE STATEMENT- SEE DOCUMENT

                                                SPECIES DEPENDENT CRITERIA - SEE DOCUMENT  M
    FR
Cite/Source
                              65FR66443

                               Gold Book

                               Gold Book
                                                                                                                      EPA-822R-
                                                                                                                          00-012

                                                                                                                  Gold Book
                               Gold Book

                               Gold Book

                               Gold Book
                                                               15

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                     NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR NON PRIORITY POLLUTANTS
      Non Priority Pollutant
45    Tetrachlorobenzene,l,2,4,5-

46    Tributyltin (TBT)


      Trichlorophenol,2,4,5-
CAS
Number
                                    95943
                                      95954
   Freshwater
CMC       CCC
(• g/L)       (• g/L)
   Saltwater
CMC       CCC
(• g/L)      (• g/L)
                                                                                                        Human Health
                                                                                                      For Consumption of:
                                                                                                   Water +       Organism
                                                                                                Organism (• g/L) Only (• g/L)
                                                 0.46 Q    0.072 Q       0.42 Q      0.0074 Q
                                                                 0.97 E
                                                                1,800 B,E
                                                                    LIE
                                                                 3,600 B,E
    FR
Cite/Source
                                                         65FR66443

                                                         EPA 822-F-
                                                             00-008

                                                         65FR66443
Footnotes:
A This human health criterion is the same as originally published in the Red Book which predates the 1980 methodology and did not utilize the fish ingestion
   BCF approach. This same criterion value is now published in the Gold Book.
B The organoleptic effect criterion is more stringent than the value presented in the non priority pollutants table.
C A more stringent Maximum Contaminant Level (MCL) has been issued by EPA under the Safe Drinking Water Act. Refer to drinking water regulations
   40CFR141 or Safe Drinking Water Hotline (1-800-426-4791) for values.
D According to the procedures described in the Guidelines for Deriving Numerical National Water Quality Criteria for the Protection of Aquatic Organisms
   and Their Uses, except possibly where a very sensitive species is important at a site, freshwater aquatic life should be protected if both conditions specified in
   Appendix C to the Preamble- Calculation of Freshwater Ammonia Criterion are satisfied.
E This criterion has been revised to reflect EPA's ql* or RfD, as contained in the Integrated Risk Information System (IRIS) as of May 17, 2002.  The fish
   tissue bioconcentration factor (BCF) used to derive the original criterion was retained in each case.
F  The derivation of this value is presented in the Red Book (EPA 440/9-76-023, July, 1976).
G This value is based on a 304(a) aquatic life criterion that was derived using the 1985 Guidelines (Guidelines for Deriving Numerical National Water Quality
   Criteria for the Protection of Aquatic Organisms and Their Uses, PB85-227049, January 1985) and was issued in one of the following criteria documents:
   Aluminum (EPA 440/5-86-008); Chloride (EPA 440/5-88-001); Chloropyrifos (EPA 440/5-86-005).
H This criterion is 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).
I  This value for aluminum is expressed in terms of total recoverable metal in the water column.
J  This value is based on a 304(a) aquatic life criterion that was issued in the 1995 Updates: Water Quality Criteria Documents for the Protection of Aquatic Life
   in Ambient Water (EPA-820-B-96-001). This value was derived using the GLI Guidelines (60FR15393-15399, March 23, 1995; 40CFR132 Appendix A); the
   differences between the 1985 Guidelines and the GLI Guidelines are explained on page iv of the 1995 Updates. No decision concerning this criterion was
   affected by any considerations that are specific to the Great Lakes.
K According to page 181 of the Red Book:
                                                                     16

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                     NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR NON PRIORITY POLLUTANTS

        For open ocean waters where the depth is substantially greater than the euphotic zone, the pH should not be changed more than 0.2 units from the
        naturally occurring variation or any case outside the range of 6.5 to 8.5. For shallow, highly productive coastal and estuarine areas where naturally
        occurring pH variations approach the lethal limits of some species, changes in pH should be avoided but in any case should not exceed the limits
        established for fresh water, i.e., 6.5-9.0.
L  There are three major reasons why the use of Water-Effect Ratios might be appropriate. (l)The value of 87« micro-g/1 is based on a toxicity test with the striped
   bass in water with pH= 6.5-6.6 and hardness <10 mg/L. Data in "Aluminum Water-Effect Ratio for the 3M Plant Effluent Discharge, Middleway, West
   Virginia" (May 1994) indicate that aluminum is substantially less toxic at higher pH and hardness, but the effects of pH and hardness are not well quantified at
   this time. (2) In tests with the brook trout at low pH and hardness, effects increased with increasing concentrations of total aluminum even though the
   concentration of dissolved aluminum was constant, indicating that total recoverable is a more appropriate  measurement than dissolved, at least when
   paniculate aluminum is primarily aluminum hydroxide particles. In surface waters, however, the total recoverable procedure might measure aluminum
   associated with clay particles, which might be less toxic than aluminum associated with aluminum hydroxide. (3) EPA is aware of field data indicating that
   many high quality waters in the U.S. contain more than 87 • g aluminum/L, when either total recoverable or dissolved is measured.
M U.S. EPA.  1973.  Water Quality Criteria 1972. EPA-R3-73-033. National Technical Information Service, Springfield, VA.; U.S. EPA. 1977. Temperature
   Criteria for Freshwater Fish: Protocol and Procedures. EPA-600/3-77-061.  National Technical Information Service, Springfield, VA.
N  U.S. EPA. 1986. Ambient Water Quality Criteria for Dissolved Oxygen. EPA 440/5-86-003. National Technical Information Service, Springfield, VA.
O  This criterion for manganese is not based on toxic effects, but rather is intended to  minimize objectionable qualities such as laundry stains and
   objectionable tastes in beverages.
P  Lakes and Reservoirs in Nutrient Ecoregion: II EPA 822-B-00-007, III EPA 822-B-01-008, IV EPA 822-B-01-009, V EPA 822-B-01-010, VI EPA 822-B-OO-
   008 , VII EPA 822-B-00-009, VIII EPA 822-B-01-015, IX EPA 822-B-00-011, XI EPA 822-B-00-012, XII EPA 822-B-00-013, XIII EPA 822-B-00-014,
   XIV EPA 822-B-01-011; Rivers and Streams in Nutrient Ecoregion: I EPA 822-B-01-012, II EPA 822-B-00-015,  III EPA 822-B-00-016, IV EPA 822-B-01-
   013, V EPA 822-B-01-014, VI EPA 822-B-00-017, VII EPA 822-B-00-018, VIII EPA 822-B-01-015, IX EPA 822-B-00-019, X EPA 822-B-01-016, XI EPA
   822-B-00-020, XII EPA 822-B-00-021, XIV EPA 822-B-00-022;  and Wetlands in Nutrient Ecoregion XIII EPA 822-B-00-023.
Q  EPA announced the availability of a draft updated tributyltin (TBT) document on August 7, 1997 (62FR42554). The Agency has reevaluated this  document
   and anticipates releasing an updated document for public comment in the near future.
                                                                      17

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                       NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR ORGANOLEPTIC EFFECTS
                    Pollutant
       Acenaphthene

       Monochlorobenzene

       3-Chlorophenol

       4-Chlorophenol
            ^^^m
       1,3 -Dichlorophenol

       2,5-Dichlorophenol

       2,6-Dichlorophenol

       3,4-Dichlorophenol

       2,4,5-Trichlorophenol

       2,4,6-Trichloropehnol

       2,3,4,6-Tetrachlorophenol

       2-Methyl-4-Chlorophenol
                                      CAS Number
Organoleptic Effect Criteria
          (•S/L)
FR Cite/Source
 13
 14
 15

i:
 18
3 -Methyl-4-Chlorophenol

3 -Methyl-6-Chlorophenol

2-Chlorophenol

Copper

2,4-Dichloropheno

2,4-Dimethylpehnol
                                    83329

                                    108907
                               Gold Book

                               Gold Book

                                  dBook

                               Gold Book

                               Gold Book

                               Gold Book

                               Gold Book

                               Gold Book

                               Gold Book

                               Gold Book

                               Gold Book

                               Gold Book

                               Gold Book

                               Gold Book
                               Gold Book

                                 old Book

                               Gold Book
                                                                  18

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                      NATIONAL RECOMMENDED WATER QUALITY CRITERIA FOR ORGANOLEPTIC EFFECTS
                   Pollutant
19

20
       Hexachlorocyclopentadiene

       Nitrobenzene

I 21    Pentachlorophenol

 22    Phenol

 23    Zinc
                                              CAS Number
77474
                        Organoleptic Effect Criteria
                                  (•S/L)
 1
98953

87865

108952

7440666
30
                                                              300
                            FR Cite/Source
Gold Book

Gold Book

Gold Book

Gold Book

45 FR79341
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 numbers, which provide a unique
   identification for each chemical.
                                                                   19

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                                         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 an 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 recommendations. 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 cril
moving the decimal point (e.g., for a risk level of 10"3, move the decimal point in the recommended criterion one place to the right).
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
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 California Toxics Rule.  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 are thus the Agency's 304(a) criteria.

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. 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 and 141.60-63), or can be accessed through the Safe Drinking Water Hotline (800-426-4791) or the Internet

                                                                      20

-------
(http://www.epa.gov/waterscience/drinking/standards/dwstandards.pdf).

7. Organoleptic Effects
   The compilation contains 304(a) criteria for pollutants with toxicity-based criteria as well as non-toxicity 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.

8. Gold Book
   The "Gold Book" is Quality Criteria for Water: 1986.  EPA 440/5-86-001.

9. Correction of Chemical Abstract Services Number
   The Chemical Abstract Services number (CAS) for Bis(2-Chlorisoprpyl) Ether, has been revised in IRIS and in the table. The correct CAS number for this
chemical is 108-60-1.  The previous CAS number for this pollutant was 39638-32-9.

10. Contaminants with Blanks
   EPA has not calculated criteria for contaminants with blanks. However, permit authorities should address these contaminants in NPDES permit actions using
the States' existing narrative criteria for toxics.

11. Specific Chemical Calculations
   A.  Selenium
   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 on 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 prevalent oxidation states in water, 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 is currently undertaking a reassessment of selenium, and expects the 304(a) criteria for selenium will be revised based on the final reassessment
(63FR26186). 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.
                                                                       21

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Appendices
Appendix A - Conversion Factors for Dissolved Metals
Arsenic

Cadmium


Chromium III

Chromium VI

Copper

Lead
                 Conversion Factor
                  freshwater CMC
       1.000

    1.136672-[(ln
hardness)(0.041838)]
      0.316

      0.982

      0.960

    1.46203-[(ln
hardness₯0.145712)1
                      Conversion Factor
                       freshwater CCC
       1.000

   1.101672-[(ln
hardness)(0.041838)]
                      Conversion Factor
                       saltwater CMC
1.000

0.994
      0.860
      0.960

     1.46203-[(ln
hardness₯0.145712)1
3.993

0.83

0.951
               Conversion Factor
                 saltwater CCC1
1.000

0.994
0.993

0.83

3.951
Mercury

Nickel

Selenium

Silver

Zinc
                            0.85
                            0.85

                           0.990

                           0.998

                            0.85

                           0.946
                     0.85

                     0.990

                     0.998
                                                                 22

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Appendix B - Parameters for Calculating Freshwater Dissolved Metals Criteria That Are Hardness-Dependent
Cadmium
                             -4.719
                                1.136672-[(ln
                            hardness)(0.041838)]

                                   0.316
                                                                                   ccc
                                            1.101672-[(ln
                                         hardness)(0.041838)]

                                               0.860
                                                             0.960
                                                                  0.960
                                    1.273
                             -4.705
                                1.46203-[(ln
                            hardness)(0.145712)]
                                            1.46203-[(ln
                                         hardness)(0.145712)]
Nickel

Silver

Zinc
0.8460
 1.72

0.8473
2.255

-6.59

0.884
0.8460     0.0584
               0.998
                     0.997
0.8473
0.884
 0.85

0.978
0.986
                       Hardness-dependant metals' criteria may be calculated from the following:
                       CMC (dissolved) = exp{mA [ln(hardness)]+ bA} (CF)
                       CCC (dissolved) = exp{nic [ln(hardness)]+ bc} (CF)

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 (acute criterion) calculated using the following equations.

   Where salmonid fish are present:
                                    0.275
                                         39.0
                      CMC =
                                                                 23

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                                   1 + 1()7-204-PH         1 +



  Or where salmonid fish are not present:


                                     0.411                  58.4

                       CMC = .................... +
2A. 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 (chronic criterion) calculated using the following equations.


   When fish early life stages are present:

                                     0.0577              2.487


                       CCC = ~ .................... + ........................ - ••   MIN (2.85, 1.45 •iO°-028<(25-T))
                                  I _|_ JQ7.688-pH        j + jQpH-7.688



   When fish early life stages are absent:


                                     0.0577             2.487


                       CCC = ~ .................... + ........................ - ••   1.45 ^o°'028'(25"MAX(T'7))
                                  I _|_ JQ7.688-PH        j + jQpH-7.688



2B. In addition, the highest four-day average within the 30-day period should not exceed 2.5 times the CCC.
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