A. 
Any national categorical pretreatment standard promulgated by the EPA for any industry shall be deemed incorporated into this Part 4 as of the effective date of such national categorical pretreatment standards for such standards promulgated on or after the effective date of this Part 4 and as of the effective date of this Part 4 for those national categorical pretreatment standards promulgated prior to the effective date of this Part 4, except to the extent that an applicable limitation promulgated by the state or Board is more stringent than any term(s) of such national categorical pretreatment standard; in which case, the more stringent requirement shall govern.
B. 
The Board shall notify, in writing, all affected users of the pretreatment standards applicable to their respective operations.
A. 
The Board may apply to the EPA or DEC, as appropriate, for a written certificate as to whether a particular industrial user falls within the purview of any national categorical pretreatment standard promulgated by the EPA, in accord with the terms of 40 CFR 403.6. Whenever the Board decides to make such an application, it shall notify the affected industrial user in writing so that said industrial user may submit its comments to the EPA or DEC, as the case may be.
B. 
The Board may request a reconsideration of a final determination regarding such applicability or contest said final determination by submitting an appropriate petition to the Administrator or Director.
The Board may establish fixed alternate discharge limits as an alternative to the limits set forth in an applicable national categorical pretreatment standard or any approved fixed alternative discharge limits proposed by a significant industrial user in accord with the terms of 40 CFR 403.6(e).
The Board may apply for a revision of any specific limits set forth in the national categorical pretreatment standards pursuant to the terms of 40 CFR 403.7, at such time as consistent removal of pollutants, as the term is defined in said 40 CFR 403.7, is obtained and in accord with the terms of 40 CFR 403.7.
The Board, in its discretion, may apply for a variance from a national categorical pretreatment standard as an interested person, pursuant to the terms set forth in 40 CFR 403.13.
A. 
State requirements and limitations on discharges shall apply in any case where they are more stringent than the federal requirements and limitations or those set forth in this Part 4.
B. 
The Board shall have the power to establish more stringent limitations or requirements on discharges to the POTW than those imposed by applicable state and/or federal standards if deemed necessary to comply with the objectives of this Part 4.