74:51:01:41Application of

chronic/acute criteria. Acute and chronic criteria established under § 74:51:01:55 and as translated by Appendix B at the end of this chapter shall be applied as follows: (1) Compliance with the chronic criteria or criteria continuous concentration (CCC) is based on the results of a 30-day average. Compliance with CCC in a surface water discharge permit may be based on grab or composite samples; (2) Compliance with the acute criteria or criteria maximum concentration (CMC) is based on the results of any one grab sample. However, compliance with CMC in a surface water discharge permit may be based on a composite sample.

Source: 19 SDR 111, effective January 31, 1993; transferred from § 74:03:02:32.01, July 1, 1996; 24 SDR 10, effective July 20, 1997.