S.D. Admin. R. tit. 74, art. 74:51, ch. 74:51:01, app A

Current through Register Vol. 51, page 67, December 16, 2024

Appendix A - Total Ammonia Criteria

APPENDIX A TO CHAPTER 74:51:01

Equation 1: Acute criterion for waters where salmonid fish are present.

MIN(((0.275/(1+10^7.204-pH))+(39/(1+10^pH-7.204))),(0.7249*((0.0114/(1+10^^7.204-pH))+(1.6181/(1+10^^pH-7.204)))*(23.12*10^^0.036*(20-T))))

MIN = use either the value of (((0.275/(1+10^7.204-pH))+(39/(1+10^pH-7.204))) or the value of (0.7249*((0.0114/(1+10^^7.204-pH))+(1.6181/(1+10^^pH-7.204)))*(23.12*10^^0.036*(20-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.

Equation 2: Acute criterion for waters where salmonid fish are not present.

0.7249*(((0.0114/(1+10^7.204-pH))+(1.6181/(1+10^pH-7.204)))*MIN(51.93,23.12*10^0.036*(20-T))

MIN = use either 51.93 or the value of 23.12*10^0.036*(20-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.

Equation 3: Chronic criterion

0.8876*(((0.0278/(1+10^7.688-pH))+(1.1994/(1+10^pH-7.688)))*(2.126*10^{0.028*(20-MAX(T,7)}))

T = the water temperature of the sample in degrees Centigrade.

pH - the pH of the water quality sample in standard units.MAX = use either the water temperature (T) for the sample, or 7, whichever is the greater value.

S.D. Admin. R. tit. 74, art. 74:51, ch. 74:51:01, app A

Effective 11/14/1980; transferred from Chapter 74:03:02, Appendix A, July 1, 1996; transferred from Chapter 74:51:01, Appendix C, 24 SDR 10, effective 7/20/1997; 31 SDR 29, effective 9/13/2004; 35 SDR 253, effective 5/12/2009; 47 SDR 110, effective 4/27/2021..

Aquatic Life Ambient Water Quality Criteria for Ammonia ' Freshwater 2013, EPA 822-R-13-001, April 2013.