(a) Federal Categorical Pretreatment Standards. Upon the promulgation of the Federal categorical pretreatment standards for a particular industrial subcategory, the Federal standard, if more stringent than limitations imposed under this chapter for sources in that subcategory, shall immediately supersede the limitations imposed under this chapter. The Superintendent shall notify all affected users of the applicable reporting requirements under 40 CFR, Section 403.12.
(b) Modification of Federal Standards. Where the City's wastewater treatment system achieves consistent removal of pollutants limited by Federal pretreatment standards, the City may apply to the approval authority for modification of specific limits in the Federal pretreatment standards. "Consistent removal" means reduction in the amount of a pollutant or alteration of the nature of the pollutant by the wastewater treatment system to a less toxic or harmless state in the effluent which in achieved by the system in ninety-five percent (95%) of the samples taken when measured according to the procedures set forth in Section 403.7 (c) (2) of Title 40 of the Code of Federal Regulations, Part 403 "General Pretreatment Regulations for Existing and New Sources of Pollution" promulgated pursuant to the Act. The City may then modify pollutant discharge limits in the Federal pretreatment standards if the requirements contained in 40 CFR, Part 403, Section 403.7, are fulfilled and prior approval from the approval authority is obtained.
(c) State Requirements. State requirements and limitations on discharges to the POTW shall be met by all dischargers which are subject to such standards in any instance in which they are more stringent than Federal requirements and limitations or those in this chapter or any other applicable ordinance.
(d) Right of Revision. The City reserves the right to amend this chapter to provide for more stringent limitations or requirements on discharges to the POTW where deemed necessary to comply with the objectives set forth in Section 916.01.
(e) Dilution. No discharger shall increase the use of potable or process water in any way, nor mix separate waste streams for the purpose of diluting a discharge as a partial or complete substitute for adequate treatment to achieve compliance with the standards set forth in this chapter.
(f) Supplementary Limitations No discharger shall discharge wastewater containing concentrations of the following enumerated materials, exceeding the following values:
MATERIALS | INDUSTRIAL EFFLUENT LIMITATIONS MAX/DAY (mg/l) |
Arsenic | 0.043 |
Mercury | 0.0002 |
Silver | 0.021 |
Oil and Grease |
100 |
Any other pollutants of concern shall be controlled in the industrial users control document (permit) based on mass proportioning of these pollutants. Annual review and proportioning shall occur by the City, with written notification to the user.
(Ord. 16-15. Passed 11-23-15.)