(A) Standards generally.
(1) The national categorical pretreatment standards, located in 40 C.F.R. Ch. I, Subch. N, parts 405 to 471, are hereby adopted and incorporated by reference into this chapter, and include amendments to those standards that occur hereafter as the same are published in the C.F.R. with effective dates as fixed therein.
(2) All dischargers shall meet state and local requirements and limitations on discharges when such requirements and limitations are more stringent than federal requirements and limitations.
(B) National categorical pretreatment standards.
(1) When the limits in a categorical pretreatment standard are expressed only in terms of mass of pollutant per unit of production, the Superintendent may convert the limits to equivalent limitations expressed either as mass of pollutant discharged per day or effluent concentration for the purposes of calculating effluent limitations applicable to individual industrial users.
(2) When wastewater subject to a categorical pretreatment standard is mixed with wastewater not regulated by the same standard, the Superintendent shall impose an alternate limit in accordance with 40 C.F.R. § 403.6(e).
(3) Many categorical pretreatment standards specify one limit for calculating maximum daily discharge limitations and a second limit for calculating maximum monthly average, or four-day average, limitations. Where such standards are being applied, the same production or flow figure shall be used in calculating both the average and the maximum equivalent limitation.
(4) Any industrial user operating under a permit incorporating equivalent mass or concentration limits calculated from a production-based standard shall notify the Superintendent within two business days after the user has a reasonable basis to know that the production level will significantly change within the next calendar month. Any user not notifying the Superintendent of such anticipated change will be required to meet the mass or concentration limits in its permit that were based on the original estimate of the long-term average production rate.
(C) State pretreatment standards. Users must comply with the state’s Department of Environmental Management pretreatment standards, codified at 327 IAC §§ 5-16 to 5-21.
(Ord. 7-2010, passed 11-22-2010) Penalty, see § 53.999