DEPARTMENT
OF ENVIRONMENT AND NATURAL RESOURCES
WATER
POLLUTION CONTROL PROGRAM
TOTAL
AMMONIA CRITERIA
Chapter
74:51:01
APPENDIX
A
SEE:
§ 74:51:01:22
Source:
Effective November 14, 1980; transferred from Chapter 74:03:02, Appendix A,
July 1, 1996; transferred from Chapter 74:51:01, Appendix C, 24 SDR 10,
effective July 20, 1997; 31 SDR 29, effective September 13, 2004; 35 SDR 253,
effective May 12, 2009.
APPENDIX A to Chapter 74:51:01
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Equation
1: For waters where salmonid fish are
present.
(0.275/(1+10
7.204-pH))
+ (39.0/(1+10 pH-7.204))
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pH = the pH of the
water quality sample in standard units.
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Equation 2: For waters where salmonid fish are not
present.
(0.411/(1+10
7.204-pH))
+ (58.4/(1+10 pH-7.204))
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pH - the pH of the water
quality sample in standard units.
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Equation
3: For waters where early life stages
are present.
(((0.0577/(1
+ 10 7.688-pH))
+ (2.487/(1+10 pH-7.688)))
* MIN(2.85, 1.45 * 10 0.028 * (25-T))
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MIN
= use either 2.85 or the value of 1.45 0.028 * (25-T),
whichever is the smaller value.
T
= the water temperature of the sample in degrees Centigrade.
pH - the pH of the
water quality sample in standard units.
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Equation
4: For waters where early life stages
are absent.
(((0.0577/(1
+ 10 7.688-pH))
+ (2.487/(1 + 10 pH-7.688)))
* 1.45 * 10 0.028
* (25-MAX(T,7))
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T
= the water temperature of the sample in degrees Centigrade.
pH = the pH of the
water quality sample in standards units.
MAX
= use either the water temperature (T) for the sample, or 7, whichever is the
greater value.
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Reference: 1999
Update of Ambient Water Quality Criteria for Ammonia, EPA-822-R-99-014,
December 1999.