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DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES

 

WATER POLLUTION CONTROL PROGRAM

 

 

 

 

TOTAL AMMONIA CRITERIA

 

 

Chapter 74:51:01

 

APPENDIX A

 

SEE: ยง 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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