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taken. Normally, but not always, BOD and TSS analyses are obtained from twenty-four hour composites of all outfalls, whereas pHs are determined from periodic grab samples. Within ninety days following the date for final compliance with applicable categorical pretreatment standards or in the case of a new source following commencement of the introduction of wastewater into the treatment facility, any industrial user subject to pretreatment standards and requirements shall submit to the City a report containing the information described in 40 CFR 403.1 (b)(4) - (6). (h) No statement contained in this section shall be construed as preventing any special agreement or arrangement between the City and any industrial concern whereby an industrial waste of unusual strength or character may be accepted by the City for treatment, subject to payment therefor by the industrial concern in proportion to cost and consistent with the user charge system in Chapter 915. No special agreement shall be in violation of any federal or state standards. (i) No person shall cause the discharge of slugs of water or wastes. Each person producing a discharge into the public sewers in excess of 100,000 gallons in any one day, shall construct and maintain at his own expense, a suitable storage and flow -control facility to insure equalization of discharge over a twenty-four hour period. This facility shall have a capacity of at least fifty percent (50%) of the total normal volume of a twenty-four hour production period, and the outlet to the sewer shall be equipped with a rate -discharge controller or other approved device, the regulation of which shall be directed by the Service Director. 917.02 LIMITATIONS ON WASTEWATER STRENGTH. (a) All dischargers shall comply with Section 911.12. (b) National Categorical Pretreatment Standards. National categorical pretreatment standards as promulgated by the U.S. Environmental Protection Agency (EPA) pursuant to the Act shall be met by all dischargers. An application for modification of the national categorical pretreatment standards may be considered for submittal to the Regional Administrator by the City when the City's wastewater treatment system achieves consistent removal of the pollutants as defined by 40 CFR 403.7. (c) State Requirements. State requirements and limitations on discharges to the sewage disposal system 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 or any other applicable ordinance. (d) Right of Revision. The City reserves the right to amend the Codified Ordinances to provide for more stringent limitations or requirements on discharges to the sewage disposal system where deemed necessary to comply with the objectives set forth in this chapter. (e) Dilution. No discharger shall increase the use of potable or process water in any way 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 the Codified Ordinances, contained in the Federal pretreatment standards or contained in any State requirements. This shall not prohibit the use of equalization tanks utilized to regulate flows. (f) Supplementary Limitations. No discharger shall discharge wastewater containing concentrations of the following enumerated materials, exceeding the following values: Material I (mg/L)