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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

 Equation 1:  For waters where salmonid fish are present.   (0.275/(1+10 7.204-pH)) + (39.0/(1+10 pH-7.204)) pH = the pH of the water quality sample in standard units.

 Equation 2:  For waters where salmonid fish are not present.   (0.411/(1+10 7.204-pH)) + (58.4/(1+10 pH-7.204)) pH - the pH of the water quality sample in standard units.

 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)) 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.

 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)) 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.

Reference:  1999 Update of Ambient Water Quality Criteria for Ammonia, EPA-822-R-99-014, December 1999.

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