In the application of effluent standards and limitations, water quality standards, and other legally applicable requirements under section 11-55-19, each issued NPDES permit shall specify average and maximum daily quantitative limitations for the level of pollutants in the authorized discharge in terms of weight (except pH, temperature, radiation, and any other pollutants not appropriately expressed by weight). The director, at the director's discretion, in addition to the specification of daily quantitative limitations by weight, may specify other limitations, such as average or maximum concentration limits.
Haw. Code R. § 11-55-20