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Users must comply with the categorical Pretreatment Standards found at 40 CFR Chapter 1, Subchapter N, Parts 405-471. Effluent limitations promulgated by the federal act shall apply in any instance where they are more stringent than those in this chapter. The categorical pretreatment standards found at 40 CFR Chapter 1, Subchapter N, Parts 405-471 and any future promulgated regulations are hereby incorporated.
(A) Where a categorical pretreatment standard is expressed only in terms of the concentration of a pollutant in wastewater, the Board may impose equivalent mass limits in accordance with § 52.016(D) and 40 CFR 403.6(c).
(B) When wastewater subject to a categorical pretreatment standard is mixed with wastewater not regulated by the same standard, the Board shall impose an alternate limit in accordance with 40 CFR 403.6(e).
(C) A CIU may obtain a net/gross adjustment to a categorical pretreatment standard in accordance with 40 CFR 403.15.
(D) When a categorical pretreatment standard is expressed only in terms of pollutant concentrations, a CIU may request that the Board convert the limits to equivalent mass limits. The determination to convert concentration limits to mass limits is within the discretion of the Board. The Board may establish equivalent mass limits only if the CIU meets all the conditions set forth in 40 CFR 403.6(c)(5).
(E) Once included in its permit, the CIU must comply with the equivalent limitations developed in this section in lieu of the promulgated categorical standards from which the equivalent limitations were derived.
(F) 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.
(G) Any CIU operating under a permit incorporating equivalent mass limits calculated from a production-based standard shall notify the Board within two business days after the CIU has a reasonable basis to know that the production level will significantly change within the next calendar month. Any CIU not notifying the Board 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.
(H) When the limits in a categorical pretreatment standard are expressed only in terms of mass of pollutant per unit of production, the Board may convert the limits to equivalent limitations expressed either as mass of pollutant discharged per day or effluent concentration for purposes of calculating effluent limitations applicable to CIUs.
(Ord. 9-2016, passed 6-7-2016)
A user shall comply with state pretreatment standards applicable to the user. If the state pretreatment standards are less stringent than the national pretreatment standards or local limits applicable to the user, the user shall comply with the more stringent standards. The state pretreatment standards, as amended from time to time, are hereby incorporated by reference into this chapter.
(Ord. 9-2016, passed 6-7-2016)
(A) The Board is authorized to establish local limits, by ordinance, order, in wastewater discharge permits, in other control documents, or in other notice to the user, pursuant to 40 CFR 403.5(c). The local limits allocation for a given pollutant shall not exceed the most recent calculated maximum allowable industrial loading for that pollutant. Local limits may be allocated to any user whose discharge exceeds or has the potential to exceed the most recent calculated domestic background concentrations.
(B) Local limits apply at the point where the wastewater is discharged to the POTW or as specified in the SIU wastewater discharge permit or other control document. All concentrations for metallic substances are for total metal unless indicated otherwise. The Board may impose mass or concentration-based limitations.
(C) The Board may develop Best Management Practices (BMPs) for any SIU or other user, as needed, to implement this chapter. BMPs may be implemented through a wastewater discharge permit, other control document, order, or other notice to the user. BMPs are pretreatment standards and enforceable under this chapter.
(Ord. 9-2016, passed 6-7-2016)
No user shall ever increase the use of process water, or in any way attempt to dilute a discharge, as a partial or complete substitute for adequate treatment to achieve compliance with a discharge limitation unless expressly authorized by an applicable pretreatment standard or requirement. The Board may impose mass limitations on users who are using dilution to meet applicable pretreatment standards or requirements, or in other cases when the imposition of mass limitations is appropriate.
(Ord. 9-2016, passed 6-7-2016)
Where circumstances so warrant the Board may agree to arrangements with users which modify the terms of this chapter if that arrangement complies with the NPDES permit of the Board and all other federal and state laws and regulations governing the operation of the wastewater treatment plant.
(Ord. 9-2016, passed 6-7-2016)
PRETREATMENT OF WASTEWATER
(A) In the event that a user is exceeding the limitations as set forth in §§ 52.015 through 52.021, the Board shall direct the user causing the discharge of any such materials to cease and desist from those activities or operations which cause a violation of established discharge standards or to provide wastewater treatment as necessary to comply with this chapter and to achieve compliance with all categorical pretreatment standards, local limits, and the prohibitions set out in §§ 52.015 through 52.021 within the time limitations specified by EPA, the state, or the board, whichever is more stringent.
(B) Any facilities necessary for compliance shall be provided, operated, and maintained at the user's expense. Detailed plans describing such facilities and operating procedures shall be submitted to the Board for review, and shall be acceptable to the Board before such facilities are constructed. The review of such plans and operating procedures shall in no way relieve the user from the responsibility of modifying such facilities as necessary to produce a discharge acceptable to the Board under the provisions of this chapter.
(C) Any facility classified as an industrial treatment plant per 327 IAC 5-22 shall meet the operator certification requirements in accordance with 327 IAC 5-22, as amended.
(Ord. 9-2016, passed 6-7-2016)
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