(A) When limits in a categorical pre-treatment standard are expressed only in terms of mass of pollutant per unit of production, the control authority (legal authority) may convert the limits to equivalent limitations expressed either as massed of pollutant discharged per day or effluent concentration for purposes of calculating effluent limitations applicable to individual industrial users.
(B) The control authority (legal authority) calculating equivalent mass-per-day limitations under division (A) above shall calculate such limitations by multiplying the limits in the standard by the industrial user’s average rate of production. This average rate of production shall be based not upon the designed production capacity, but rather upon a reasonable measure of the industrial user’s actual long-term daily production, such as the average daily production during a representative year. For new sources, actual production shall be estimated using projected production.
(C) The control authority (legal authority) calculating equivalent concentration limitations under division (A) of this section shall calculate such limitations by dividing the mass limitations derived under division (B) of this section by the average daily flow rate of the industrial user’s regulated process wastewater. This average daily flow rate shall be based upon a reasonable measure of the industrial user’s actual long-term average flow rate, such as the average daily flow rate during the representative year.
(D) Equivalent limitations calculated in accordance with division (B) and (C) of this section shall be deemed pre-treatment standards for the purposes of this chapter. Industrial users will be required to comply with the equivalent limitations in lieu of the promulgated categorical standards from which the equivalent limitations were derived.
(Ord. 610.1-07-08-13, passed 7-8-2013) Penalty, see § 55.999