.03-2 Numerical Criteria for Toxic Substances in Surface Waters.
A. Numerical toxic substance criteria shall be applied:
(1) In intermittent streams, at the end of the discharge pipe; and
(2) In all other water bodies, at the edge of the mixing zones determined in accordance with Regulation .05C—E of this chapter.
B. Acceptable laboratory methods for the detection and measurement of toxic substances shall be specified by the Department.
C. Site-specific numerical toxic substance criteria may be developed on a site-specific basis. A person who wishes to develop a site-specific numerical toxic substance criterion shall:
(1) Do so in accordance with a scientifically defensible methodology approved by the Department; and
(2) Notify the Department of their intent not later than the time specified in COMAR 26.08.04.01-1.
D. The toxicity of certain substances in Tables 1 and 6 of §G of this regulation is increased or decreased by hardness or pH. For these toxic substances:
(1) The Department may:
(a) Require the discharger to provide site-specific measurements; or
(b) Recalculate the aquatic life criteria based on available water quality data.
(2) The permittee may voluntarily provide site-specific information for the recalculation of the criteria. It is within the Department's discretion to determine the weight given this information.
(3) After reviewing the information provided in §D(1) or (2), the Department shall determine if one or more of these criteria should be modified at a particular location.
(4) For calculation of site-specific copper criteria, a discharger may use the Biotic Ligand Model in accordance with "Aquatic Life Ambient Freshwater Quality Criteria-Copper 2007 Revision (EPA-822-R-07-001, February 2007)" which is incorporated by reference.
E. In those cases where numerical toxic substance criteria for aquatic life protection and protection of human health both apply, the most restrictive of the criteria shall be used.
F. Acute and chronic numeric toxic substance criteria for fresh, estuarine, and salt water aquatic life protection and for human health protection are shown in Tables 1—6 of §G. For the instream application of the acute and chronic criteria for the protection of aquatic life in Tables 1—6 of §G of this regulation:
(1) The metals shall be measured as dissolved metal or as biologically available equivalence and may be translated to total recoverable measurements for waste load allocation to derive discharge permit limits using the procedures for the biological translator or chemical translator described in COMAR 26.08.04;
(2) The organic substances shall be measured directly or as biologically available equivalence and may be translated for waste load allocation to derive discharge permit limits using the procedures for the biological translator described in COMAR 26.08.04; and
(3) Cyanide shall be measured as either free cyanide or cyanide amenable to chlorination.
G. Tables of Ambient Water Quality Criteria.
(1) Table 1. Toxic Substances Criteria for Ambient Surface Waters — Inorganic Substances.
Substance
|
CAS#
|
Aquatic Life (μg/L)
|
Human Health for
Consumption of:
|
Fresh Water
|
Estuarine
Water
|
Salt Water
|
Drinking Water
+
Organism
(
μg/L)
|
Organism
Only
(
μg/L
)
|
Drinking
Water
MCL
(mg/L)
|
Acute
|
Chronic
|
Acute
|
Chronic
|
Acute
|
Chronic
|
Antimony
|
7440360
|
|
|
|
|
|
|
5.6
|
640
|
0.006
|
Arsenic
|
7440382
|
340
|
150
|
|
|
69
|
36
|
0.18
d
|
1.4
a,d
|
0.010
|
Asbestos
|
1332214
|
|
|
|
|
|
|
|
7 million fibers/L
|
7 million fibers/L
|
Barium
|
7440393
|
|
|
|
|
|
|
1,000
|
|
2
|
Beryllium
|
|
|
|
|
|
|
|
4
|
|
0.004
|
Cadmium
1
|
7440439
|
1.8
|
0.72
|
|
|
33.13
|
7.9
|
5
|
|
0.005
|
Chlorine
2
|
7782505
|
19
|
11
|
|
|
13
|
7.5
|
|
|
|
Chromium
(total)
|
7440473
|
|
|
|
|
|
|
100
|
|
0.1
|
Chromium III
1
|
16065831
|
570
|
74
|
|
|
|
|
|
|
|
Chromium VI
|
18540299
|
16
|
11
|
|
|
1100
|
50
|
|
|
|
Copper
1
|
7440508
|
13
|
9
|
6.1
|
|
4.8
|
3.1
|
1,300
d
|
|
1.3
c
|
Cyanide
|
57125
|
22
|
5.2
|
|
|
1
|
1
|
140
|
140
|
0.2
|
Lead
1
|
7439921
|
65
|
2.5
|
|
|
210
|
8.1
|
|
|
0.015
c
|
Mercury
|
7439976
|
1.4
|
0.77
|
|
|
1.8
|
0.94
|
|
|
0.002
|
Methylmercury
b
|
22967926
|
|
|
|
|
|
|
|
0.3 mg/kg in fish tissue
|
|
Nickel
1
|
7440020
|
470
|
52
|
|
|
74
|
8.2
|
610
|
4,600
|
|
Selenium
|
7782492
|
20
|
5
|
|
|
290
|
71
|
170
|
4,200
|
0.05
|
Silver
1
|
7440224
|
3.2
|
|
|
|
1.9
|
|
|
|
0.10
|
Thallium
|
7440280
|
|
|
|
|
|
|
0.24
|
0.47
|
0.002
|
Zinc
1
|
7440666
|
120
|
120
|
|
|
90
|
81
|
7,400
|
26,000
|
|
1 Refer to §D of this regulation.
2 The more stringent of these criteria or the discharge requirements in COMAR 26.08.03.06 shall be used as the basis for determining discharge permit limitations.
a This criterion will be applied against the actual measurement of inorganic arsenic (As+3) rather than total arsenic.
b Per EPA recommendation, total mercury concentrations, as opposed to methylmercury, will be used in MDE fish consumption risk-calculation. This approach is deemed to be most protective of human health and most cost-effective.
c Lead and Copper are regulated by a treatment technique that requires systems to control the corrosiveness of their water. If more than 10 percent of tap water samples exceed the action level, water systems must take additional steps. The values listed are technically action levels.
d Criterion is based on a carcinogenic risk level of 10-5.
* Drinking water MCLs apply to Public Water Supply designated waters only.
(2) Table 2. Coefficients Used to Adjust Applicable Numerical Toxic Substance Fresh Water Aquatic Life Criteria. *
Substance
|
CAS#
|
mA
|
bA
|
mC
|
bC
|
Cadmium
|
7440439
|
0.9789
|
-3.866
|
0.7977
|
-3.909
|
Chromium III
|
16065831
|
0.8190
|
3.7256
|
0.8190
|
0.6848
|
Lead
|
7439921
|
1.273
|
-1.460
|
1.273
|
-4.705
|
Nickel
|
7440020
|
0.8460
|
2.255
|
0.8460
|
0.0584
|
Silver
|
7440224
|
1.72
|
-6.59
|
-
|
-
|
Zinc
|
7440666
|
0.8473
|
0.884
|
0.8473
|
0.884
|
(3) Table 3. Conversion Factors Used to Adjust Applicable Numerical Toxic Substance Fresh Water Aquatic Life Criteria.
Substance
|
CAS#
|
Freshwater Acute Conversion Factor (CF)
|
Freshwater Chronic Conversion Factor (CF)
|
Cadmium
|
7440439
|
1.136672-LN(Hardness)*0.041838
|
1.101672-LN(Hardness)*0.041838
|
Chromium III
|
16065831
|
0.316
|
0.86
|
Lead
|
7439921
|
1.46203-LN(Hardness)*0.145712
|
1.46203-LN(Hardness)*0.145712
|
Nickel
|
7440020
|
0.998
|
0.997
|
Silver
|
7440224
|
0.85
|
-
|
Zinc
|
7440666
|
0.978
|
0.986
|
*Hardness-dependent criteria may be calculated from the following:
Acute Criteria = e
mA *LN(hardness)+bA
*CF
Chronic Criteria = e
mC *LN(hardness)+bC
*CF
(4) Table 4. Toxic Substances for Ambient Water Quality Criteria — Organic Compounds.
Substance
|
CAS#
|
Aquatic Life (μg/L)
|
Human Health for
Consumption of:
|
Fresh Water
|
Salt Water
|
Drinking Water
+
Organism
(μg/L)
|
Organism
Only
(μg/L)
|
Drinking
Water
MCL
(mg/L)
|
Acute
|
Chronic
|
Acute
|
Chronic
|
1,1 Dichloroethylene (DCE)
|
75354
|
|
|
|
|
300
|
20000
|
0.007
|
1,1,1-Trichloroethane (TCA)
|
71556
|
|
|
|
|
200
|
|
0.2
|
1,1,2,2-Tetrachloroethane
|
79345
|
|
|
|
|
1.7
a
|
40
a
|
|
1,1,2-Trichloroethane
|
79005
|
|
|
|
|
5.9
a
|
160
a
|
0.005
|
1,2,4-Trichlorobenzene
|
120821
|
|
|
|
|
35
a
|
70
a
|
0.07
|
1,2,4,5-Tetrachlorobenzene
|
95943
|
|
|
|
|
0.03
|
0.03
|
|
1,2-Dichlorobenzene
|
95501
|
|
|
|
|
1000
|
3000
|
0.6
|
1,2-Dichloroethane
|
107062
|
|
|
|
|
99
a
|
6500
a
|
0.005
|
1,2-Dichloropropane
|
78875
|
|
|
|
|
5
a
|
150
a
|
0.005
|
1,2-Diphenylhydrazine
|
122667
|
|
|
|
|
0.3
a
|
2
a
|
|
1,2-Trans-Dichloroethylene
|
156605
|
|
|
|
|
100
|
4000
|
0.1
|
1,3-Dichlorobenzene
|
541731
|
|
|
|
|
320
|
960
|
|
1,3-Dichloropropene
|
542756
|
|
|
|
|
3.4
a
|
210
a
|
|
1,4-Dichlorobenzene
|
106467
|
|
|
|
|
300
|
900
|
0.075
|
2,4,5-Trichlorophenol
|
95954
|
|
|
|
|
300
|
600
|
|
2,4,6-Trichlorophenol
|
88062
|
|
|
|
|
14
a
|
24
a
|
|
2,4-Dichlorophenol
|
120832
|
|
|
|
|
77
|
290
|
|
2,4-Dimethylphenol
|
105679
|
|
|
|
|
100
|
3000
|
|
2,4-Dinitrotoluene
|
121142
|
|
|
|
|
1.1
a
|
34
a
|
|
2-Chloronapthalene
|
91587
|
|
|
|
|
800
|
1000
|
|
2-Chlorophenol
|
95578
|
|
|
|
|
81
|
150
|
|
2-Methyl-4,6-Dinitrophenol
|
534521
|
|
|
|
|
2
|
30
|
|
3,3'-Dichlorobenzidine
|
91941
|
|
|
|
|
0.49
a
|
1.5
a
|
|
3-Methyl-4-Chlorophenol
|
59507
|
|
|
|
|
500
|
2000
|
|
Acrolein
|
107028
|
3
|
3
|
|
|
6
|
9
|
|
Acrylonitrile
|
107131
|
|
|
|
|
0.61
a
|
70
a
|
|
Benzene
|
71432
|
|
|
|
|
22
a
|
510
a
|
0.005
|
Benzidine
|
92875
|
|
|
|
|
0.0014
a
|
0.11
a
|
|
Bis(2-Chloroethyl) Ether
|
111444
|
|
|
|
|
0.3
a
|
22
a
|
|
Bis2(Chloroisopropyl) Ether
|
108601
|
|
|
|
|
200
|
4000
|
|
Bis(Chloromethyl) Ether
|
542881
|
|
|
|
|
0.0015
a
|
0.17
a
|
|
Bromoform
1
|
75252
|
|
|
|
|
See
Trihalomethanes
|
1400
a
|
|
Carbon tetrachloride
|
56235
|
|
|
|
|
4
a
|
50
a
|
0.005
|
Chlorobenzene
|
108907
|
|
|
|
|
130
|
1600
|
0.1
|
Chlorodibromomethane
1
|
124481
|
|
|
|
|
8
a
|
210
a
|
|
Chloroform
1
|
67663
|
|
|
|
|
60
|
2000
|
|
Chlorophenoxy Herbicide (2,4-D)
|
94757
|
|
|
|
|
1300
|
12000
|
|
Chlorophenoxy Herbicide (2,4,5-TP)
|
93721
|
|
|
|
|
100
|
400
|
|
Dichlorobromomethane
1
|
75274
|
|
|
|
|
See
Trihalomethanes
|
170
a
|
|
Dinitrophenols
|
25550587
|
|
|
|
|
10
|
1000
|
|
Ethylbenzene
|
100414
|
|
|
|
|
530
|
2100
|
0.7
|
Hexachlorobenzene
|
118741
|
|
|
|
|
0.00079
a
|
0.00079
a
|
0.001
|
Hexachlorobutadiene
|
87683
|
|
|
|
|
4.4
a
|
180
a
|
|
Hexachlorocyclopenta-diene
|
77474
|
|
|
|
|
4
|
4
|
0.05
|
Hexachloroethane
|
67721
|
|
|
|
|
14
a
|
33
a
|
|
Hexachlorocyclohexane (HCH)-Technical
|
608731
|
|
|
|
|
0.066
a
|
0.1
a
|
|
Isophorone
|
78591
|
|
|
|
|
340
a
|
18000
a
|
|
Methoxychlor
|
72435
|
|
|
|
|
0.02
|
0.02
|
|
Methyl bromide
|
74839
|
|
|
|
|
100
|
10000
|
|
Methylene chloride
|
75092
|
|
|
|
|
200
a
|
10000
a
|
0.005
|
Nitrobenzene
|
98953
|
|
|
|
|
10
|
600
|
|
N-Nitrosodimethylamine
|
62759
|
|
|
|
|
0.0069
a
|
30
a
|
|
N-Nitrosodi-n-Propylamine
|
621647
|
|
|
|
|
0.05
a
|
5.1
a
|
|
N-Nitrosodiphenylamine
|
86306
|
|
|
|
|
33
a
|
60
a
|
|
Nonylphenol
|
84852153
|
28
|
6.6
|
7
|
1.7
|
|
|
|
Phenol
|
108952
|
|
|
|
|
4000
|
300000
|
|
Tetrachloroethylene
|
127184
|
|
|
|
|
100
a
|
290
a
|
0.005
|
Toluene
|
108883
|
|
|
|
|
1300
|
15000
|
1
|
Trichloroethylene (TCE)
|
79016
|
|
|
|
|
6
a
|
70
a
|
0.005
|
Trihalomethanes
1
|
|
|
|
|
|
80
|
|
0.08
|
Vinyl chloride
|
75014
|
|
|
|
|
0.22
a
|
16
a
|
0.002
|
1
Four compounds (bromoform, chlorodibromomethane, chloroform, and dichlorobromomethane) are found in combination and comprise a category of contaminants called "trihalomethanes" formed as a result of drinking water disinfection. The concentration of any of these compounds individually, or all of them in sum, may not exceed 80 micrograms per liter. This criterion is equal to the Safe Drinking Water Act Maximum Contaminant Level.
a
Criterion is based on a carcinogenic risk level of 10
-5
.
* Drinking water MCLs apply to Public Water Supply designated waters only.
(5) Table 5. Toxic Substances for Ambient Water Quality Criteria-Polycyclic Aromatic Hydrocarbons and Phthalates.
Substance
|
CAS#
|
Aquatic Life (μg/L)
|
Human Health for
Consumption of:
|
Fresh Water
|
Salt Water
|
Drinking Water
+
Organism
(μg/L)
|
Organism
Only
(μg/L)
|
Drinking
Water
MCL
(mg/L)
|
Acute
|
Chronic
|
Acute
|
Chronic
|
Acenaphthene
|
83329
|
|
|
|
|
70
|
90
|
|
Anthracene
|
120127
|
|
|
|
|
300
|
400
|
|
Benzo(a)Anthracene
|
56553
|
|
|
|
|
0.012
a
|
0.013
a
|
|
Benzo(a)Pyrene
|
50328
|
|
|
|
|
0.0012
a
|
0.0013
a
|
0.0002
|
Benzo(b)Fluoranthene
|
205992
|
|
|
|
|
0.012
a
|
0.013
a
|
|
Benzo(k)Fluoranthene
|
207089
|
|
|
|
|
0.12
a
|
0.13
a
|
|
Chrysene
|
218019
|
|
|
|
|
0.038
a
|
0.18
a
|
|
Dibenzo(a,h)Anthracene
|
53703
|
|
|
|
|
0.0012
a
|
0.0013
a
|
|
Fluoranthene
|
206440
|
|
|
|
|
20
|
20
|
|
Fluorene
|
86737
|
|
|
|
|
50
|
70
|
|
Ideno(1,2,3-cd)Pyrene
|
193395
|
|
|
|
|
0.012
a
|
0.013
a
|
|
Pyrene
|
129000
|
|
|
|
|
20
|
30
|
|
Bis(2-Ethylhexyl) Phthalate
|
117817
|
|
|
|
|
3.2
a
|
3.7
a
|
0.006
|
Butylbenzyl Phthalate
|
85687
|
|
|
|
|
1
a
|
1
a
|
|
Diethyl Phthalate
|
84662
|
|
|
|
|
600
|
600
|
|
Dimethyl Phthalate
|
131113
|
|
|
|
|
2000
|
2000
|
|
Di-n-Butyl Phthalate
|
84742
|
|
|
|
|
20
|
30
|
|
a
Criterion is based on a carcinogenic risk level of 10
-5
.
* Drinking water MCLs apply to Public Water Supply designated waters only.
(6) Table 6. Toxic Substances for Ambient Water Quality Criteria — Pesticides and Chlorinated Compounds.
Substance
|
CAS#
|
Aquatic Life (μg/L)
|
Human Health for
Consumption of:
|
Fresh Water
|
Salt Water
|
Drinking Water
+
Organism
(μg/L)
|
Organism
Only
(μg/L)
|
Drinking
Water
MCL
(mg/L)
|
Acute
|
Chronic
|
Acute
|
Chronic
|
2, 3, 7, 8-TCDD (Dioxin)
|
1746016
|
|
|
|
|
0.00000005
a
|
0.00000051
a
|
3 X 10
-8
|
4,4'-DDD
|
72548
|
|
|
|
|
0.0012
a
|
0.0012
a
|
|
4,4'-DDE
|
72559
|
|
|
|
|
0.0018
a
|
0.0018
a
|
|
4,4'-DDT
|
50293
|
1.1
|
0.001
|
0.13
|
0.001
|
0.0003
a
|
0.0003
a
|
|
Aldrin
|
309002
|
3
|
|
1.3
|
|
0.0000077
a
|
0.0000077
a
|
|
alpha-BHC
|
319846
|
|
|
|
|
0.036
a
|
0.039
a
|
|
alpha-Endosulfan
|
959988
|
0.22
|
0.056
|
0.034
|
0.0087
|
20
|
30
|
|
Atrazine
|
1912249
|
|
|
|
|
3
|
|
0.003
|
beta-BHC
|
319857
|
|
|
|
|
0.08
a
|
0.14
a
|
|
beta-Endosulfan
|
33213659
|
0.22
|
0.056
|
0.034
|
0.0087
|
20
|
40
|
|
Carbaryl
|
63252
|
2.1
|
2.1
|
1.6
|
|
|
|
|
Chlordane
|
57749
|
2.4
|
0.0043
|
0.09
|
0.004
|
0.0031
a
|
0.0032
a
|
0.002
|
Chlorpyrifos
|
2921882
|
0.083
|
0.041
|
0.011
|
0.0056
|
|
|
|
Diazinon
|
333415
|
0.17
|
0.17
|
0.82
|
0.82
|
|
|
|
Dieldrin
|
60571
|
0.24
|
0.056
|
0.71
|
0.0019
|
0.000012
a
|
0.000012
a
|
|
Endosulfan Sulfate
|
1031078
|
|
|
|
|
20
|
40
|
|
Endrin
|
72208
|
0.086
|
0.036
|
0.037
|
0.0023
|
0.059
|
0.060
|
0.002
|
Endrin Aldehyde
|
7421934
|
|
|
|
|
1
|
1
|
|
gamma-BHC (Lindane)
|
58899
|
0.95
|
|
0.16
|
|
4.2
|
4.4
|
0.0002
|
Heptachlor
|
76448
|
0.52
|
0.0038
|
0.053
|
0.0036
|
0.000059
a
|
0.000059
a
|
0.0004
|
Heptachlor Epoxide
|
1024573
|
0.52
|
0.0038
|
0.053
|
0.0036
|
0.00032
a
|
0.00032
a
|
0.0002
|
Polychlorinated Biphenyls PCBs
|
|
|
0.014
|
|
0.03
|
0.00064
a
|
0.00064
a
|
0.0005
|
Toxaphene
|
8001352
|
0.73
|
0.002
|
0.21
|
0.002
|
0.007
a
|
0.0071
a
|
0.003
|
Tributyltin (TBT)
|
|
0.46
|
0.072
|
0.42
|
0.0074
|
|
|
|
Pentachlorobenzene
|
608935
|
|
|
|
|
0.1
|
0.1
|
|
Pentachlorophenol (PCP)
1
|
87865
|
19
|
15
|
13
|
7.9
|
2.7
a
|
30
a
|
0.001
|
1
The freshwater aquatic life criteria for PCP are expressed as a function of pH. Refer to §D of this regulation.
a
Criterion is based on a carcinogenic risk level of 10
-5
.
* Drinking water MCLs apply to Public Water Supply designated waters only.
H. Acute Numeric Toxic Substance Criteria for Ammonia for the Protection of Fresh Water Aquatic Life.
(1) The use of Tables 3 and 4 requires documentation acceptable to the Department of the absence of freshwater mussels using the methods outlined in the document “Procedures for Applying the Mussel-Absent Ammonia Criteria to Maryland Surface Waters”, which is incorporated by reference.
(2) Presence of Salmonid Fish. In Class III, III-P, IV, and IV-P waters, the concentration of total ammonia (in milligrams of nitrogen per liter) may not exceed the acute criterion listed in Table 1.
(3) Absence of Salmonid Fish. In Class I and I-P waters, the concentration of total ammonia (in milligrams of nitrogen per liter) may not exceed the acute criterion listed in Table 2.
(4) Presence of Salmonid Fish and Absence of Freshwater Mussels. In Class III, III-P, IV, and IV-P waters, the concentration of total ammonia (in milligrams of nitrogen per liter) may not exceed the acute criterion listed in Table 3.
(5) Absence of Salmonid Fish and Absence of Freshwater Mussels. In Class I and I-P waters, the concentration of total ammonia (in milligrams of nitrogen per liter) may not exceed the acute criterion listed in Table 4.
(6) Table 1. Acute Water Quality Criteria for Freshwater Aquatic Life for Ammonia Where Salmonids May Be Present (milligrams of nitrogen per liter)
1
.
Temperature (
o
C)
|
pH
|
14
|
15
|
16
|
17
|
18
|
19
|
20
|
21
|
22
|
23
|
24
|
25
|
26
|
27
|
28
|
29
|
30
|
6.5
|
32.6
|
32.6
|
31.6
|
29.1
|
26.8
|
24.6
|
22.7
|
20.9
|
19.2
|
17.7
|
16.3
|
15.0
|
13.8
|
12.7
|
11.7
|
10.8
|
9.9
|
6.6
|
31.3
|
31.3
|
30.3
|
27.9
|
25.7
|
23.6
|
21.8
|
20.0
|
18.4
|
17.0
|
15.6
|
14.4
|
13.2
|
12.2
|
11.2
|
10.3
|
9.5
|
6.7
|
29.8
|
29.8
|
28.8
|
26.5
|
24.4
|
22.5
|
20.7
|
19.0
|
17.5
|
16.1
|
14.9
|
13.7
|
12.6
|
11.6
|
10.7
|
9.8
|
9.0
|
6.8
|
28.0
|
28.0
|
27.2
|
25.0
|
23.0
|
21.2
|
19.5
|
18.0
|
16.5
|
15.2
|
14.0
|
12.9
|
11.9
|
10.9
|
10.0
|
9.2
|
8.5
|
6.9
|
26.2
|
26.2
|
25.3
|
23.3
|
21.5
|
19.8
|
18.2
|
16.7
|
15.4
|
14.2
|
13.1
|
12.0
|
11.1
|
10.2
|
9.4
|
8.6
|
7.9
|
7.0
|
24.1
|
24.1
|
23.3
|
21.5
|
19.8
|
18.2
|
16.8
|
15.4
|
14.2
|
13.1
|
12.0
|
11.1
|
10.2
|
9.4
|
8.6
|
7.9
|
7.3
|
7.1
|
21.9
|
21.9
|
21.3
|
19.6
|
18.0
|
16.6
|
15.3
|
14.0
|
12.9
|
11.9
|
11.0
|
10.1
|
9.3
|
8.5
|
7.9
|
7.2
|
6.7
|
7.2
|
19.7
|
19.7
|
19.1
|
17.6
|
16.2
|
14.9
|
13.7
|
12.6
|
11.6
|
10.7
|
9.8
|
9.1
|
8.3
|
7.7
|
7.1
|
6.5
|
6.0
|
7.3
|
17.5
|
17.5
|
17.0
|
15.6
|
14.4
|
13.2
|
12.2
|
11.2
|
10.3
|
9.5
|
8.7
|
8.0
|
7.4
|
6.8
|
6.3
|
5.8
|
5.3
|
7.4
|
15.3
|
15.3
|
14.9
|
13.7
|
12.6
|
11.6
|
10.7
|
9.8
|
9.0
|
8.3
|
7.7
|
7.0
|
6.5
|
6.0
|
5.5
|
5.1
|
4.7
|
7.5
|
13.3
|
13.3
|
12.9
|
11.8
|
10.9
|
10.0
|
9.2
|
8.5
|
7.8
|
7.2
|
6.6
|
6.1
|
5.6
|
5.2
|
4.8
|
4.4
|
4.0
|
7.6
|
11.4
|
11.4
|
11.0
|
10.1
|
9.3
|
8.6
|
7.9
|
7.3
|
6.7
|
6.2
|
5.7
|
5.2
|
4.8
|
4.4
|
4.1
|
3.8
|
3.5
|
7.7
|
9.6
|
9.6
|
9.3
|
8.6
|
7.9
|
7.3
|
6.7
|
6.2
|
5.7
|
5.2
|
4.8
|
4.4
|
4.1
|
3.8
|
3.5
|
3.2
|
2.9
|
7.8
|
8.1
|
8.1
|
7.9
|
7.2
|
6.7
|
6.1
|
5.6
|
5.2
|
4.8
|
4.4
|
4.0
|
3.7
|
3.4
|
3.2
|
2.9
|
2.7
|
2.5
|
7.9
|
6.8
|
6.8
|
6.6
|
6.0
|
5.6
|
5.1
|
4.7
|
4.3
|
4.0
|
3.7
|
3.4
|
3.1
|
2.9
|
2.6
|
2.4
|
2.2
|
2.1
|
8.0
|
5.6
|
5.6
|
5.4
|
5.0
|
4.6
|
4.2
|
3.9
|
3.6
|
3.3
|
3.0
|
2.8
|
2.6
|
2.4
|
2.2
|
2.0
|
1.9
|
1.7
|
8.1
|
4.6
|
4.6
|
4.5
|
4.1
|
3.8
|
3.5
|
3.2
|
3.0
|
2.7
|
2.5
|
2.3
|
2.1
|
2.0
|
1.8
|
1.7
|
1.5
|
1.4
|
8.2
|
3.8
|
3.8
|
3.7
|
3.4
|
3.1
|
2.9
|
2.7
|
2.4
|
2.3
|
2.1
|
1.9
|
1.8
|
1.6
|
1.5
|
1.4
|
1.3
|
1.2
|
8.3
|
3.1
|
3.1
|
3.1
|
2.8
|
2.6
|
2.4
|
2.2
|
2.0
|
1.9
|
1.7
|
1.6
|
1.4
|
1.3
|
1.2
|
1.1
|
1.0
|
1.0
|
8.4
|
2.6
|
2.6
|
2.5
|
2.3
|
2.1
|
2.0
|
1.8
|
1.7
|
1.5
|
1.4
|
1.3
|
1.2
|
1.1
|
1.0
|
0.9
|
0.9
|
0.8
|
8.5
|
2.1
|
2.1
|
2.1
|
1.9
|
1.8
|
1.6
|
1.5
|
1.4
|
1.3
|
1.2
|
1.1
|
1.0
|
0.9
|
0.8
|
0.8
|
0.7
|
0.6
|
8.6
|
1.8
|
1.8
|
1.7
|
1.6
|
1.5
|
1.3
|
1.2
|
1.1
|
1.0
|
1.0
|
0.9
|
0.8
|
0.7
|
0.7
|
0.6
|
0.6
|
0.5
|
8.7
|
1.5
|
1.5
|
1.4
|
1.3
|
1.2
|
1.1
|
1.0
|
0.9
|
0.9
|
0.8
|
0.7
|
0.7
|
0.6
|
0.6
|
0.5
|
0.5
|
0.4
|
8.8
|
1.2
|
1.2
|
1.2
|
1.1
|
1.0
|
0.9
|
0.9
|
0.8
|
0.7
|
0.7
|
0.6
|
0.6
|
0.5
|
0.5
|
0.4
|
0.4
|
0.4
|
8.9
|
1.0
|
1.0
|
1.0
|
0.9
|
0.9
|
0.8
|
0.7
|
0.7
|
0.6
|
0.6
|
0.5
|
0.5
|
0.4
|
0.4
|
0.4
|
0.3
|
0.3
|
9.0
|
0.9
|
0.9
|
0.9
|
0.8
|
0.7
|
0.7
|
0.6
|
0.6
|
0.5
|
0.5
|
0.4
|
0.4
|
0.4
|
0.3
|
0.3
|
0.3
|
0.3
|
1
The acute water quality criteria for total ammonia where salmonids may be present was calculated using the following equation, which may also be used to calculate unlisted values: Acute water quality criteria for ammonia (salmonids present) =
Where MIN indicates the lesser of the two values separated by a comma.
(7) Table 2. Acute Water Quality Criteria for Freshwater Aquatic Life for Ammonia Where Salmonids Are Absent (milligrams of nitrogen per liter)
1
.
pH
|
10
|
11
|
12
|
13
|
14
|
15
|
16
|
17
|
18
|
19
|
20
|
21
|
22
|
23
|
24
|
25
|
26
|
27
|
28
|
29
|
30
|
6.5
|
50.9
|
47.8
|
44.0
|
40.5
|
37.3
|
34.3
|
31.6
|
29.1
|
26.8
|
24.6
|
22.7
|
20.9
|
19.2
|
17.7
|
16.3
|
15.0
|
13.8
|
12.7
|
11.7
|
10.8
|
9.9
|
6.6
|
48.9
|
45.9
|
42.2
|
38.9
|
35.8
|
32.9
|
30.3
|
27.9
|
25.7
|
23.6
|
21.8
|
20.0
|
18.4
|
17.0
|
15.6
|
14.4
|
13.2
|
12.2
|
11.2
|
10.3
|
9.5
|
6.7
|
46.5
|
43.6
|
40.2
|
37.0
|
34.0
|
31.3
|
28.8
|
26.5
|
24.4
|
22.5
|
20.7
|
19.0
|
17.5
|
16.1
|
14.9
|
13.7
|
12.6
|
11.6
|
10.7
|
9.8
|
9.0
|
6.8
|
43.8
|
41.1
|
37.9
|
34.8
|
32.1
|
29.5
|
27.2
|
25.0
|
23.0
|
21.2
|
19.5
|
18.0
|
16.5
|
15.2
|
14.0
|
12.9
|
11.9
|
10.9
|
10.0
|
9.2
|
8.5
|
6.9
|
40.8
|
38.3
|
35.3
|
32.5
|
29.9
|
27.5
|
25.3
|
23.3
|
21.5
|
19.8
|
18.2
|
16.7
|
15.4
|
14.2
|
13.1
|
12.0
|
11.1
|
10.2
|
9.4
|
8.6
|
7.9
|
7.0
|
37.6
|
35.3
|
32.5
|
29.9
|
27.6
|
25.4
|
23.3
|
21.5
|
19.8
|
18.2
|
16.8
|
15.4
|
14.2
|
13.1
|
12.0
|
11.1
|
10.2
|
9.4
|
8.6
|
7.9
|
7.3
|
7.1
|
34.3
|
32.2
|
29.6
|
27.3
|
25.1
|
23.1
|
21.3
|
19.6
|
18.0
|
16.6
|
15.3
|
14.0
|
12.9
|
11.9
|
11.0
|
10.1
|
9.3
|
8.5
|
7.9
|
7.2
|
6.7
|
7.2
|
30.8
|
28.9
|
26.6
|
24.5
|
22.6
|
20.8
|
19.1
|
17.6
|
16.2
|
14.9
|
13.7
|
12.6
|
11.6
|
10.7
|
9.8
|
9.1
|
8.3
|
7.7
|
7.1
|
6.5
|
6.0
|
7.3
|
27.3
|
25.7
|
23.6
|
21.7
|
20.0
|
18.4
|
17.0
|
15.6
|
14.4
|
13.2
|
12.2
|
11.2
|
10.3
|
9.5
|
8.7
|
8.0
|
7.4
|
6.8
|
6.3
|
5.8
|
5.3
|
7.4
|
24.0
|
22.5
|
20.7
|
19.1
|
17.5
|
16.1
|
14.9
|
13.7
|
12.6
|
11.6
|
10.7
|
9.8
|
9.0
|
8.3
|
7.7
|
7.0
|
6.5
|
6.0
|
5.5
|
5.1
|
4.7
|
7.5
|
20.7
|
19.5
|
17.9
|
16.5
|
15.2
|
14.0
|
12.9
|
11.8
|
10.9
|
10.0
|
9.2
|
8.5
|
7.8
|
7.2
|
6.6
|
6.1
|
5.6
|
5.2
|
4.8
|
4.4
|
4.0
|
7.6
|
17.8
|
16.7
|
15.4
|
14.1
|
13.0
|
12.0
|
11.0
|
10.1
|
9.3
|
8.6
|
7.9
|
7.3
|
6.7
|
6.2
|
5.7
|
5.2
|
4.8
|
4.4
|
4.1
|
3.8
|
3.5
|
7.7
|
15.1
|
14.1
|
13.0
|
12.0
|
11.0
|
10.1
|
9.3
|
8.6
|
7.9
|
7.3
|
6.7
|
6.2
|
5.7
|
5.2
|
4.8
|
4.4
|
4.1
|
3.8
|
3.5
|
3.2
|
2.9
|
7.8
|
12.7
|
11.9
|
10.9
|
10.1
|
9.3
|
8.5
|
7.9
|
7.2
|
6.7
|
6.1
|
5.6
|
5.2
|
4.8
|
4.4
|
4.0
|
3.7
|
3.4
|
3.2
|
2.9
|
2.7
|
2.5
|
7.9
|
10.6
|
9.9
|
9.1
|
8.4
|
7.7
|
7.1
|
6.6
|
6.0
|
5.6
|
5.1
|
4.7
|
4.3
|
4.0
|
3.7
|
3.4
|
3.1
|
2.9
|
2.6
|
2.4
|
2.2
|
2.1
|
8.0
|
8.8
|
8.2
|
7.6
|
7.0
|
6.4
|
5.9
|
5.4
|
5.0
|
4.6
|
4.2
|
3.9
|
3.6
|
3.3
|
3.0
|
2.8
|
2.6
|
2.4
|
2.2
|
2.0
|
1.9
|
1.7
|
8.1
|
7.2
|
6.8
|
6.3
|
5.8
|
5.3
|
4.9
|
4.5
|
4.1
|
3.8
|
3.5
|
3.2
|
3.0
|
2.7
|
2.5
|
2.3
|
2.1
|
2.0
|
1.8
|
1.7
|
1.5
|
1.4
|
8.2
|
6.0
|
5.6
|
5.2
|
4.8
|
4.4
|
4.0
|
3.7
|
3.4
|
3.1
|
2.9
|
2.7
|
2.4
|
2.3
|
2.1
|
1.9
|
1.8
|
1.6
|
1.5
|
1.4
|
1.3
|
1.2
|
8.3
|
4.9
|
4.6
|
4.2
|
3.9
|
3.6
|
3.3
|
3.1
|
2.8
|
2.6
|
2.4
|
2.2
|
2.0
|
1.9
|
1.7
|
1.6
|
1.4
|
1.3
|
1.2
|
1.1
|
1.0
|
1.0
|
8.4
|
4.1
|
3.8
|
3.5
|
3.2
|
3.0
|
2.7
|
2.5
|
2.3
|
2.1
|
2.0
|
1.8
|
1.7
|
1.5
|
1.4
|
1.3
|
1.2
|
1.1
|
1.0
|
0.9
|
0.9
|
0.8
|
8.5
|
3.3
|
3.1
|
2.9
|
2.7
|
2.4
|
2.3
|
2.1
|
1.9
|
1.8
|
1.6
|
1.5
|
1.4
|
1.3
|
1.2
|
1.1
|
1.0
|
0.9
|
0.8
|
0.8
|
0.7
|
0.6
|
8.6
|
2.8
|
2.6
|
2.4
|
2.2
|
2.0
|
1.9
|
1.7
|
1.6
|
1.5
|
1.3
|
1.2
|
1.1
|
1.0
|
1.0
|
0.9
|
0.8
|
0.7
|
0.7
|
0.6
|
0.6
|
0.5
|
8.7
|
2.3
|
2.2
|
2.0
|
1.8
|
1.7
|
1.5
|
1.4
|
1.3
|
1.2
|
1.1
|
1.0
|
0.9
|
0.9
|
0.8
|
0.7
|
0.7
|
0.6
|
0.6
|
0.5
|
0.5
|
0.4
|
8.8
|
1.9
|
1.8
|
1.7
|
1.5
|
1.4
|
1.3
|
1.2
|
1.1
|
1.0
|
0.9
|
0.9
|
0.8
|
0.7
|
0.7
|
0.6
|
0.6
|
0.5
|
0.5
|
0.4
|
0.4
|
0.4
|
8.9
|
1.6
|
1.5
|
1.4
|
1.3
|
1.2
|
1.1
|
1.0
|
0.9
|
0.9
|
0.8
|
0.7
|
0.7
|
0.6
|
0.6
|
0.5
|
0.5
|
0.4
|
0.4
|
0.4
|
0.3
|
0.3
|
9.0
|
1.4
|
1.3
|
1.2
|
1.1
|
1.0
|
0.9
|
0.9
|
0.8
|
0.7
|
0.7
|
0.6
|
0.6
|
0.5
|
0.5
|
0.4
|
0.4
|
0.4
|
0.3
|
0.3
|
0.3
|
0.3
|
1
The acute water quality criteria for total ammonia where salmonids are absent were calculated using the following equation, which may also be used to calculate unlisted values: Acute water quality criteria for ammonia (salmonids absent) =
Where MIN indicates the lesser of the two values separated by a comma.
(8) Table 3. Acute Water Quality Criteria for Freshwater Aquatic Life for Ammonia Where Salmonids May Be Present and Freshwater Mussels Are Absent (milligrams of nitrogen per liter)
1
.
Temperature (
o
C)
|
pH
|
14
|
15
|
16
|
17
|
18
|
19
|
20
|
21
|
22
|
23
|
24
|
25
|
26
|
27
|
28
|
29
|
30
|
6.5
|
32.6
|
32.6
|
32.6
|
32.6
|
32.6
|
32.6
|
32.6
|
32.6
|
32.6
|
32.6
|
32.6
|
32.6
|
32.6
|
32.6
|
31.4
|
28.9
|
26.6
|
6.6
|
31.3
|
31.3
|
31.3
|
31.3
|
31.3
|
31.3
|
31.3
|
31.3
|
31.3
|
31.3
|
31.3
|
31.3
|
31.3
|
31.3
|
30.1
|
27.7
|
25.5
|
6.7
|
29.8
|
29.8
|
29.8
|
29.8
|
29.8
|
29.8
|
29.8
|
29.8
|
29.8
|
29.8
|
29.8
|
29.8
|
29.8
|
29.8
|
28.7
|
26.4
|
24.3
|
6.8
|
28.0
|
28.0
|
28.0
|
28.0
|
28.0
|
28.0
|
28.0
|
28.0
|
28.0
|
28.0
|
28.0
|
28.0
|
28.0
|
28.0
|
27.0
|
24.9
|
22.9
|
6.9
|
26.2
|
26.2
|
26.2
|
26.2
|
26.2
|
26.2
|
26.2
|
26.2
|
26.2
|
26.2
|
26.2
|
26.2
|
26.2
|
26.2
|
25.2
|
23.2
|
21.3
|
7.0
|
24.1
|
24.1
|
24.1
|
24.1
|
24.1
|
24.1
|
24.1
|
24.1
|
24.1
|
24.1
|
24.1
|
24.1
|
24.1
|
24.1
|
23.2
|
21.4
|
19.7
|
7.1
|
21.9
|
21.9
|
21.9
|
21.9
|
21.9
|
21.9
|
21.9
|
21.9
|
21.9
|
21.9
|
21.9
|
21.9
|
21.9
|
21.9
|
21.1
|
19.5
|
17.9
|
7.2
|
19.7
|
19.7
|
19.7
|
19.7
|
19.7
|
19.7
|
19.7
|
19.7
|
19.7
|
19.7
|
19.7
|
19.7
|
19.7
|
19.7
|
19.0
|
17.5
|
16.1
|
7.3
|
17.5
|
17.5
|
17.5
|
17.5
|
17.5
|
17.5
|
17.5
|
17.5
|
17.5
|
17.5
|
17.5
|
17.5
|
17.5
|
17.5
|
16.9
|
15.5
|
14.3
|
7.4
|
15.3
|
15.3
|
15.3
|
15.3
|
15.3
|
15.3
|
15.3
|
15.3
|
15.3
|
15.3
|
15.3
|
15.3
|
15.3
|
15.3
|
14.8
|
13.6
|
12.5
|
7.5
|
13.3
|
13.3
|
13.3
|
13.3
|
13.3
|
13.3
|
13.3
|
13.3
|
13.3
|
13.3
|
13.3
|
13.3
|
13.3
|
13.3
|
12.8
|
11.8
|
10.8
|
7.6
|
11.4
|
11.4
|
11.4
|
11.4
|
11.4
|
11.4
|
11.4
|
11.4
|
11.4
|
11.4
|
11.4
|
11.4
|
11.4
|
11.4
|
11.0
|
10.1
|
9.3
|
7.7
|
9.6
|
9.6
|
9.6
|
9.6
|
9.6
|
9.6
|
9.6
|
9.6
|
9.6
|
9.6
|
9.6
|
9.6
|
9.6
|
9.6
|
9.3
|
8.5
|
7.9
|
7.8
|
8.1
|
8.1
|
8.1
|
8.1
|
8.1
|
8.1
|
8.1
|
8.1
|
8.1
|
8.1
|
8.1
|
8.1
|
8.1
|
8.1
|
7.8
|
7.2
|
6.6
|
7.9
|
6.8
|
6.8
|
6.8
|
6.8
|
6.8
|
6.8
|
6.8
|
6.8
|
6.8
|
6.8
|
6.8
|
6.8
|
6.8
|
6.8
|
6.5
|
6.0
|
5.5
|
8.0
|
5.6
|
5.6
|
5.6
|
5.6
|
5.6
|
5.6
|
5.6
|
5.6
|
5.6
|
5.6
|
5.6
|
5.6
|
5.6
|
5.6
|
5.4
|
5.0
|
4.6
|
8.1
|
4.6
|
4.6
|
4.6
|
4.6
|
4.6
|
4.6
|
4.6
|
4.6
|
4.6
|
4.6
|
4.6
|
4.6
|
4.6
|
4.6
|
4.5
|
4.1
|
3.8
|
8.2
|
3.8
|
3.8
|
3.8
|
3.8
|
3.8
|
3.8
|
3.8
|
3.8
|
3.8
|
3.8
|
3.8
|
3.8
|
3.8
|
3.8
|
3.7
|
3.4
|
3.1
|
8.3
|
3.1
|
3.1
|
3.1
|
3.1
|
3.1
|
3.1
|
3.1
|
3.1
|
3.1
|
3.1
|
3.1
|
3.1
|
3.1
|
3.1
|
3.0
|
2.8
|
2.6
|
8.4
|
2.6
|
2.6
|
2.6
|
2.6
|
2.6
|
2.6
|
2.6
|
2.6
|
2.6
|
2.6
|
2.6
|
2.6
|
2.6
|
2.6
|
2.5
|
2.3
|
2.1
|
8.5
|
2.1
|
2.1
|
2.1
|
2.1
|
2.1
|
2.1
|
2.1
|
2.1
|
2.1
|
2.1
|
2.1
|
2.1
|
2.1
|
2.1
|
2.1
|
1.9
|
1.7
|
8.6
|
1.8
|
1.8
|
1.8
|
1.8
|
1.8
|
1.8
|
1.8
|
1.8
|
1.8
|
1.8
|
1.8
|
1.8
|
1.8
|
1.8
|
1.7
|
1.6
|
1.4
|
8.7
|
1.5
|
1.5
|
1.5
|
1.5
|
1.5
|
1.5
|
1.5
|
1.5
|
1.5
|
1.5
|
1.5
|
1.5
|
1.5
|
1.5
|
1.4
|
1.3
|
1.2
|
8.8
|
1.2
|
1.2
|
1.2
|
1.2
|
1.2
|
1.2
|
1.2
|
1.2
|
1.2
|
1.2
|
1.2
|
1.2
|
1.2
|
1.2
|
1.2
|
1.1
|
1.0
|
8.9
|
1.0
|
1.0
|
1.0
|
1.0
|
1.0
|
1.0
|
1.0
|
1.0
|
1.0
|
1.0
|
1.0
|
1.0
|
1.0
|
1.0
|
1.0
|
0.9
|
0.8
|
9.0
|
0.9
|
0.9
|
0.9
|
0.9
|
0.9
|
0.9
|
0.9
|
0.9
|
0.9
|
0.9
|
0.9
|
0.9
|
0.9
|
0.9
|
0.9
|
0.8
|
0.7
|
1
The acute water quality criteria for total ammonia where salmonids are present and freshwater mussels are absent were calculated using the following equation, which may also be used to calculate unlisted values: Acute water quality criteria for ammonia (salmonids present and freshwater mussels absent) =CMC=
Where MIN indicates the lesser of the two values separated by a comma.
(9) Table 4. Acute Water Quality Criteria for Freshwater Aquatic Life for Ammonia Where Salmonids Are Absent and Freshwater Mussels Are Absent (milligrams of nitrogen per liter)
1
.
Temperature (
o
C)
|
pH
|
14
|
15
|
16
|
17
|
18
|
19
|
20
|
21
|
22
|
23
|
24
|
25
|
26
|
27
|
28
|
29
|
30
|
6.5
|
50.9
|
50.9
|
50.9
|
50.9
|
50.9
|
50.9
|
50.9
|
50.9
|
50.9
|
47.5
|
43.8
|
40.3
|
37.1
|
34.1
|
31.4
|
28.9
|
26.6
|
6.6
|
48.9
|
48.9
|
48.9
|
48.9
|
48.9
|
48.9
|
48.9
|
48.9
|
48.9
|
45.6
|
42.0
|
38.6
|
35.6
|
32.7
|
30.1
|
27.7
|
25.5
|
6.7
|
46.5
|
46.5
|
46.5
|
46.5
|
46.5
|
46.5
|
46.5
|
46.5
|
46.5
|
43.4
|
39.9
|
36.8
|
33.8
|
31.1
|
28.7
|
26.4
|
24.3
|
6.8
|
43.8
|
43.8
|
43.8
|
43.8
|
43.8
|
43.8
|
43.8
|
43.8
|
43.8
|
40.9
|
37.6
|
34.6
|
31.9
|
29.3
|
27.0
|
24.9
|
22.9
|
6.9
|
40.8
|
40.8
|
40.8
|
40.8
|
40.8
|
40.8
|
40.8
|
40.8
|
40.8
|
38.1
|
35.1
|
32.3
|
29.7
|
27.4
|
25.2
|
23.2
|
21.3
|
7.0
|
37.6
|
37.6
|
37.6
|
37.6
|
37.6
|
37.6
|
37.6
|
37.6
|
37.6
|
35.1
|
32.3
|
29.8
|
27.4
|
25.2
|
23.2
|
21.4
|
19.7
|
7.1
|
34.3
|
34.3
|
34.3
|
34.3
|
34.3
|
34.3
|
34.3
|
34.3
|
34.3
|
32.0
|
29.4
|
27.1
|
24.9
|
23.0
|
21.1
|
19.5
|
17.9
|
7.2
|
30.8
|
30.8
|
30.8
|
30.8
|
30.8
|
30.8
|
30.8
|
30.8
|
30.8
|
28.8
|
26.5
|
24.4
|
22.4
|
20.6
|
19.0
|
17.5
|
16.1
|
7.3
|
27.3
|
27.3
|
27.3
|
27.3
|
27.3
|
27.3
|
27.3
|
27.3
|
27.3
|
25.5
|
23.5
|
21.6
|
19.9
|
18.3
|
16.9
|
15.5
|
14.3
|
7.4
|
24.0
|
24.0
|
24.0
|
24.0
|
24.0
|
24.0
|
24.0
|
24.0
|
24.0
|
22.4
|
20.6
|
18.9
|
17.4
|
16.1
|
14.8
|
13.6
|
12.5
|
7.5
|
20.7
|
20.7
|
20.7
|
20.7
|
20.7
|
20.7
|
20.7
|
20.7
|
20.7
|
19.4
|
17.8
|
16.4
|
15.1
|
13.9
|
12.8
|
11.8
|
10.8
|
7.6
|
17.8
|
17.8
|
17.8
|
17.8
|
17.8
|
17.8
|
17.8
|
17.8
|
17.8
|
16.6
|
15.3
|
14.0
|
12.9
|
11.9
|
11.0
|
10.1
|
9.3
|
7.7
|
15.1
|
15.1
|
15.1
|
15.1
|
15.1
|
15.1
|
15.1
|
15.1
|
15.1
|
14.1
|
12.9
|
11.9
|
11.0
|
10.1
|
9.3
|
8.5
|
7.9
|
7.8
|
12.7
|
12.7
|
12.7
|
12.7
|
12.7
|
12.7
|
12.7
|
12.7
|
12.7
|
11.8
|
10.9
|
10.0
|
9.2
|
8.5
|
7.8
|
7.2
|
6.6
|
7.9
|
10.6
|
10.6
|
10.6
|
10.6
|
10.6
|
10.6
|
10.6
|
10.6
|
10.6
|
9.9
|
9.1
|
8.4
|
7.7
|
7.1
|
6.5
|
6.0
|
5.5
|
8.0
|
8.8
|
8.8
|
8.8
|
8.8
|
8.8
|
8.8
|
8.8
|
8.8
|
8.8
|
8.2
|
7.5
|
6.9
|
6.4
|
5.9
|
5.4
|
5.0
|
4.6
|
8.1
|
7.2
|
7.2
|
7.2
|
7.2
|
7.2
|
7.2
|
7.2
|
7.2
|
7.2
|
6.8
|
6.2
|
5.7
|
5.3
|
4.9
|
4.5
|
4.1
|
3.8
|
8.2
|
6.0
|
6.0
|
6.0
|
6.0
|
6.0
|
6.0
|
6.0
|
6.0
|
6.0
|
5.6
|
5.1
|
4.7
|
4.3
|
4.0
|
3.7
|
3.4
|
3.1
|
8.3
|
4.9
|
4.9
|
4.9
|
4.9
|
4.9
|
4.9
|
4.9
|
4.9
|
4.9
|
4.6
|
4.2
|
3.9
|
3.6
|
3.3
|
3.0
|
2.8
|
2.6
|
8.4
|
4.1
|
4.1
|
4.1
|
4.1
|
4.1
|
4.1
|
4.1
|
4.1
|
4.1
|
3.8
|
3.5
|
3.2
|
2.9
|
2.7
|
2.5
|
2.3
|
2.1
|
8.5
|
3.3
|
3.3
|
3.3
|
3.3
|
3.3
|
3.3
|
3.3
|
3.3
|
3.3
|
3.1
|
2.9
|
2.6
|
2.4
|
2.2
|
2.1
|
1.9
|
1.7
|
8.6
|
2.8
|
2.8
|
2.8
|
2.8
|
2.8
|
2.8
|
2.8
|
2.8
|
2.8
|
2.6
|
2.4
|
2.2
|
2.0
|
1.9
|
1.7
|
1.6
|
1.4
|
8.7
|
2.3
|
2.3
|
2.3
|
2.3
|
2.3
|
2.3
|
2.3
|
2.3
|
2.3
|
2.1
|
2.0
|
1.8
|
1.7
|
1.5
|
1.4
|
1.3
|
1.2
|
8.8
|
1.9
|
1.9
|
1.9
|
1.9
|
1.9
|
1.9
|
1.9
|
1.9
|
1.9
|
1.8
|
1.7
|
1.5
|
1.4
|
1.3
|
1.2
|
1.1
|
1.0
|
8.9
|
1.6
|
1.6
|
1.6
|
1.6
|
1.6
|
1.6
|
1.6
|
1.6
|
1.6
|
1.5
|
1.4
|
1.3
|
1.2
|
1.1
|
1.0
|
0.9
|
0.8
|
9.0
|
1.4
|
1.4
|
1.4
|
1.4
|
1.4
|
1.4
|
1.4
|
1.4
|
1.4
|
1.3
|
1.2
|
1.1
|
1.0
|
0.9
|
0.9
|
0.8
|
0.7
|
1
The acute water quality criteria for total ammonia where salmonids are present and freshwater mussels are absent were calculated using the following equation, which may also be used to calculate unlisted values: Acute water quality criteria for ammonia (salmonids present and freshwater mussels absent) =
Where MIN indicates the lesser of the two values separated by a comma.
I. Chronic Numeric Toxic Substance Criteria for Ammonia, Expressed as a 30-day Average, for the Protection of Fresh Water Aquatic Life.
(1) Averaging Period. The concentration of total ammonia nitrogen (in milligrams of nitrogen per liter) expressed as a 30-day average may not exceed the chronic criterion listed in Tables 1, 2 or 3.
(2) The use of Table 3 requires documentation acceptable to the Department of the absence of fish early life stages.
(3) The use of Table 2 or 3 requires documentation acceptable to the Department of the absence of freshwater mussels using the methods outlined in the document Procedures for Applying Mussel-Absent Ammonia Criteria to Maryland Surface Waters.
(4) In addition, the highest 4-day average within the 30-day period may not exceed 2 1/2 times the chronic criterion.
(5) Table 1. Chronic Ammonia Criteria for Waters Where Freshwater Fish Early Life Stages May Be Present (milligrams of nitrogen per liter).
1
|
Temperature (℃)
|
pH
|
7
|
8
|
9
|
10
|
11
|
12
|
13
|
14
|
15
|
16
|
17
|
18
|
19
|
20
|
21
|
22
|
23
|
24
|
25
|
26
|
27
|
28
|
29
|
30
|
6.5
|
4.92
|
4.61
|
4.33
|
4.06
|
3.80
|
3.57
|
3.34
|
3.13
|
2.94
|
2.75
|
2.58
|
2.42
|
2.27
|
2.13
|
2.00
|
1.87
|
1.75
|
1.64
|
1.54
|
1.45
|
1.36
|
1.27
|
1.19
|
1.12
|
6.6
|
4.85
|
4.54
|
4.26
|
3.99
|
3.75
|
3.51
|
3.29
|
3.09
|
2.89
|
2.71
|
2.54
|
2.38
|
2.24
|
2.10
|
1.97
|
1.84
|
1.73
|
1.62
|
1.52
|
1.42
|
1.33
|
1.25
|
1.17
|
1.10
|
6.7
|
4.76
|
4.46
|
4.18
|
3.92
|
3.68
|
3.45
|
3.23
|
3.03
|
2.84
|
2.66
|
2.50
|
2.34
|
2.19
|
2.06
|
1.93
|
1.81
|
1.70
|
1.59
|
1.49
|
1.40
|
1.31
|
1.23
|
1.15
|
1.08
|
6.8
|
4.65
|
4.36
|
4.08
|
3.83
|
3.59
|
3.37
|
3.16
|
2.96
|
2.77
|
2.60
|
2.44
|
2.29
|
2.14
|
2.01
|
1.88
|
1.77
|
1.66
|
1.55
|
1.46
|
1.37
|
1.28
|
1.20
|
1.13
|
1.05
|
6.9
|
4.52
|
4.23
|
3.97
|
3.72
|
3.49
|
3.27
|
3.07
|
2.88
|
2.70
|
2.53
|
2.37
|
2.22
|
2.08
|
1.95
|
1.83
|
1.72
|
1.61
|
1.51
|
1.42
|
1.33
|
1.24
|
1.17
|
1.09
|
1.03
|
7
|
4.36
|
4.09
|
3.84
|
3.60
|
3.37
|
3.16
|
2.96
|
2.78
|
2.60
|
2.44
|
2.29
|
2.15
|
2.01
|
1.89
|
1.77
|
1.66
|
1.56
|
1.46
|
1.37
|
1.28
|
1.20
|
1.13
|
1.06
|
0.99
|
7.1
|
4.18
|
3.92
|
3.68
|
3.45
|
3.23
|
3.03
|
2.84
|
2.66
|
2.50
|
2.34
|
2.20
|
2.06
|
1.93
|
1.81
|
1.70
|
1.59
|
1.49
|
1.40
|
1.31
|
1.23
|
1.15
|
1.08
|
1.01
|
0.95
|
7.2
|
3.98
|
3.73
|
3.50
|
3.28
|
3.07
|
2.88
|
2.70
|
2.53
|
2.38
|
2.23
|
2.09
|
1.96
|
1.84
|
1.72
|
1.61
|
1.51
|
1.42
|
1.33
|
1.25
|
1.17
|
1.10
|
1.03
|
0.96
|
0.90
|
7.3
|
3.75
|
3.51
|
3.29
|
3.09
|
2.90
|
2.72
|
2.55
|
2.39
|
2.24
|
2.10
|
1.97
|
1.84
|
1.73
|
1.62
|
1.52
|
1.43
|
1.34
|
1.25
|
1.17
|
1.10
|
1.03
|
0.97
|
0.91
|
0.85
|
7.4
|
3.49
|
3.28
|
3.07
|
2.88
|
2.70
|
2.53
|
2.37
|
2.23
|
2.09
|
1.96
|
1.83
|
1.72
|
1.61
|
1.51
|
1.42
|
1.33
|
1.25
|
1.17
|
1.10
|
1.03
|
0.96
|
0.90
|
0.85
|
0.79
|
7.5
|
3.22
|
3.02
|
2.83
|
2.66
|
2.49
|
2.33
|
2.19
|
2.05
|
1.92
|
1.80
|
1.69
|
1.59
|
1.49
|
1.39
|
1.31
|
1.22
|
1.15
|
1.08
|
1.01
|
0.95
|
0.89
|
0.83
|
0.78
|
0.73
|
7.6
|
2.94
|
2.75
|
2.58
|
2.42
|
2.27
|
2.13
|
1.99
|
1.87
|
1.75
|
1.64
|
1.54
|
1.44
|
1.35
|
1.27
|
1.19
|
1.12
|
1.05
|
0.98
|
0.92
|
0.86
|
0.81
|
0.76
|
0.71
|
0.67
|
7.7
|
2.64
|
2.48
|
2.32
|
2.18
|
2.04
|
1.91
|
1.79
|
1.68
|
1.58
|
1.48
|
1.39
|
1.30
|
1.22
|
1.14
|
1.07
|
1.00
|
0.94
|
0.88
|
0.83
|
0.78
|
0.73
|
0.68
|
0.64
|
0.60
|
7.8
|
2.35
|
2.20
|
2.07
|
1.94
|
1.82
|
1.70
|
1.60
|
1.50
|
1.40
|
1.32
|
1.23
|
1.16
|
1.08
|
1.02
|
0.95
|
0.89
|
0.84
|
0.79
|
0.74
|
0.69
|
0.65
|
0.61
|
0.57
|
0.53
|
7.9
|
2.07
|
1.94
|
1.82
|
1.70
|
1.60
|
1.50
|
1.40
|
1.32
|
1.23
|
1.16
|
1.08
|
1.02
|
0.95
|
0.89
|
0.84
|
0.79
|
0.74
|
0.69
|
0.65
|
0.61
|
0.57
|
0.53
|
0.50
|
0.47
|
8
|
1.80
|
1.68
|
1.58
|
1.48
|
1.39
|
1.30
|
1.22
|
1.14
|
1.07
|
1.01
|
0.94
|
0.88
|
0.83
|
0.78
|
0.73
|
0.68
|
0.64
|
0.60
|
0.56
|
0.53
|
0.49
|
0.46
|
0.43
|
0.41
|
8.1
|
1.55
|
1.45
|
1.36
|
1.28
|
1.20
|
1.12
|
1.05
|
0.99
|
0.92
|
0.87
|
0.81
|
0.76
|
0.71
|
0.67
|
0.63
|
0.59
|
0.55
|
0.52
|
0.49
|
0.45
|
0.43
|
0.40
|
0.37
|
0.35
|
8.2
|
1.32
|
1.24
|
1.16
|
1.09
|
1.02
|
0.96
|
0.90
|
0.84
|
0.79
|
0.74
|
0.69
|
0.65
|
0.61
|
0.57
|
0.54
|
0.50
|
0.47
|
0.44
|
0.41
|
0.39
|
0.36
|
0.34
|
0.32
|
0.30
|
8.3
|
1.13
|
1.05
|
0.99
|
0.93
|
0.87
|
0.82
|
0.76
|
0.72
|
0.67
|
0.63
|
0.59
|
0.55
|
0.52
|
0.49
|
0.46
|
0.43
|
0.40
|
0.38
|
0.35
|
0.33
|
0.31
|
0.29
|
0.27
|
0.26
|
8.4
|
0.95
|
0.89
|
0.84
|
0.78
|
0.74
|
0.69
|
0.65
|
0.61
|
0.57
|
0.53
|
0.50
|
0.47
|
0.44
|
0.41
|
0.39
|
0.36
|
0.34
|
0.32
|
0.30
|
0.28
|
0.26
|
0.25
|
0.23
|
0.22
|
8.5
|
0.80
|
0.75
|
0.71
|
0.66
|
0.62
|
0.58
|
0.55
|
0.51
|
0.48
|
0.45
|
0.42
|
0.40
|
0.37
|
0.35
|
0.33
|
0.31
|
0.29
|
0.27
|
0.25
|
0.24
|
0.22
|
0.21
|
0.19
|
0.18
|
8.6
|
0.68
|
0.64
|
0.60
|
0.56
|
0.52
|
0.49
|
0.46
|
0.43
|
0.41
|
0.38
|
0.36
|
0.33
|
0.31
|
0.29
|
0.28
|
0.26
|
0.24
|
0.23
|
0.21
|
0.20
|
0.19
|
0.18
|
0.16
|
0.15
|
8.7
|
0.57
|
0.54
|
0.50
|
0.47
|
0.44
|
0.42
|
0.39
|
0.37
|
0.34
|
0.32
|
0.30
|
0.28
|
0.27
|
0.25
|
0.23
|
0.22
|
0.20
|
0.19
|
0.18
|
0.17
|
0.16
|
0.15
|
0.14
|
0.13
|
8.8
|
0.49
|
0.46
|
0.43
|
0.40
|
0.38
|
0.35
|
0.33
|
0.31
|
0.29
|
0.27
|
0.26
|
0.24
|
0.23
|
0.21
|
0.20
|
0.19
|
0.17
|
0.16
|
0.15
|
0.14
|
0.13
|
0.13
|
0.12
|
0.11
|
8.9
|
0.42
|
0.39
|
0.37
|
0.34
|
0.32
|
0.30
|
0.28
|
0.27
|
0.25
|
0.23
|
0.22
|
0.21
|
0.19
|
0.18
|
0.17
|
0.16
|
0.15
|
0.14
|
0.13
|
0.12
|
0.11
|
0.11
|
0.10
|
0.09
|
9
|
0.36
|
0.34
|
0.32
|
0.30
|
0.28
|
0.26
|
0.24
|
0.23
|
0.21
|
0.20
|
0.19
|
0.18
|
0.17
|
0.16
|
0.15
|
0.14
|
0.13
|
0.12
|
0.11
|
0.11
|
0.10
|
0.09
|
0.09
|
0.08
|
1
The freshwater chronic water quality criteria for total ammonia where fish early life stages may be present were calculated using the following equation, which may also be used to calculate unlisted values:
Freshwater chronic water quality criterion for ammonia (fish early life stages present) =
Where MAX indicates the greater of the two values separated by a comma.
(6) Table 2. Chronic Ammonia Criteria for Waters Where Freshwater Fish Early Life Stages Are Present and Freshwater mussels are absent (milligrams of nitrogen per liter).
1
|
Temperature (℃)
|
pH
|
7
|
8
|
9
|
10
|
11
|
12
|
13
|
14
|
15
|
16
|
17
|
18
|
19
|
20
|
21
|
22
|
23
|
24
|
25
|
26
|
27
|
28
|
29
|
30
|
6.5
|
7.34
|
7.34
|
7.34
|
7.34
|
7.34
|
7.34
|
7.34
|
7.34
|
7.34
|
7.34
|
7.34
|
7.34
|
7.34
|
7.34
|
7.34
|
7.04
|
6.60
|
6.19
|
5.80
|
5.44
|
5.10
|
4.78
|
4.48
|
4.20
|
6.6
|
7.23
|
7.23
|
7.23
|
7.23
|
7.23
|
7.23
|
7.23
|
7.23
|
7.23
|
7.23
|
7.23
|
7.23
|
7.23
|
7.23
|
7.23
|
6.93
|
6.50
|
6.09
|
5.71
|
5.36
|
5.02
|
4.71
|
4.41
|
4.14
|
6.7
|
7.10
|
7.10
|
7.10
|
7.10
|
7.10
|
7.10
|
7.10
|
7.10
|
7.10
|
7.10
|
7.10
|
7.10
|
7.10
|
7.10
|
7.10
|
6.80
|
6.38
|
5.98
|
5.61
|
5.26
|
4.93
|
4.62
|
4.33
|
4.06
|
6.8
|
6.93
|
6.93
|
6.93
|
6.93
|
6.93
|
6.93
|
6.93
|
6.93
|
6.93
|
6.93
|
6.93
|
6.93
|
6.93
|
6.93
|
6.93
|
6.65
|
6.23
|
5.84
|
5.48
|
5.14
|
4.81
|
4.51
|
4.23
|
3.97
|
6.9
|
6.74
|
6.74
|
6.74
|
6.74
|
6.74
|
6.74
|
6.74
|
6.74
|
6.74
|
6.74
|
6.74
|
6.74
|
6.74
|
6.74
|
6.74 |