74:51:01:52Criteria for fish and

wildlife propagation, recreation, and stock watering waters. The criteria of parameters for fish and wildlife propagation, recreation, and stock watering waters and their allowable variations that are not included under § 74:51:01:55 and Appendix B, unless set under § 74:51:01:24, are as found in the following table: Parameter Criteria Unit of Measure Special Conditions Total alkalinity as calcium carbonate < 750 mg/L 30-day average < 1313 mg/L daily maximum Total dissolved solids < 2,500 mg/L 30-day average < 4,375 mg/L daily maximum Conductivity at 25°C < 4,000 micromhos/cm 30-day average < 7,000 micromhos/cm daily maximum Nitrates as N < 50 mg/L 30-day average < 88 mg/L daily maximum pH > 6.0 - < 9.5 units see § 74:51:01:07 Total petroleum hydrocarbon < 10 mg/L see § 74:51:01:10 Oil and grease < 10 mg/L see § 74:51:01:10

Source: SL 1975, ch 16, § 1; 4 SDR 32, effective December 4, 1977; transferred from § 34:04:02:42, effective July 1, 1979; 10 SDR 145, effective July 4, 1984; 13 SDR 129, 13 SDR 141, effective July 1, 1987; 19 SDR 111, effective January 31, 1993; transferred from § 74:03:02:42, July 1, 1996; 24 SDR 10, effective July 20, 1997; 25 SDR 98, effective January 27, 1999.