74:52:03:19Mass limits.

All pollutants limited in permits for continuous discharges shall have limits, standards, or prohibitions expressed in terms of mass except: (1) For pH, temperature, radiation, or other pollutants which cannot be expressed by mass; (2) When applicable standards and limits are expressed in terms of other units of measurement; or (3) If, in establishing permit limits case by case, limits expressed in terms of mass are infeasible because the mass of the pollutant discharged cannot be related to a measure of operation, and permit conditions ensure that dilution will not be used as a substitute for treatment. Pollutants limited in terms of mass may be limited additionally in terms of other units of measurement, and the permit shall require the permittee to comply with both limits.

Source: 14 SDR 86, effective December 24, 1987; 19 SDR 122, effective February 21, 1993; transferred from § 74:03:19:18, July 1, 1996.