A.   Basis For Effluent Limitations:
      1.   Effluent limitations shall be based upon the more stringent of the following:
         a.   National categorical pretreatment standards;
         b.   State pretreatment requirements; or
         c.   Local limitations calculated by mass balance or other valid scientific methods necessary to protect the POTW from materials described in the sewer discharge regulations subsection C. The basis for effluent limitations will be reviewed as part of the NPDES permit application (every 5 years).
   B.   Compliance; Initial Report:
      1.   Within ninety (90) days following the date for final compliance with applicable categorical standards or, in the case of a new source, following commencement of the introduction of wastewater into the POTW, any user subject to categorical standards and requirements shall submit to the city a report indicating the nature and concentration of all pollutants in the discharge from the regulated process which are limited by categorical standards and requirements and the average and maximum daily flow for these process units in the user facility which are limited by such categorical standards or requirements. The report shall state whether the applicable categorical standards or requirements are being met on a consistent basis and, if not, what additional operation and maintenance (O&M) and/or pretreatment is necessary to bring the user into compliance with the applicable categorical standards and requirements. This statement shall be signed by an authorized representative of the industrial user and certified to by a professional engineer.
      2.   Industrial users shall immediately notify the city and as soon as possible thereafter the EPA regional waste management division manager, and State hazardous waste authorities in writing of any discharge into the POTW of a substance which, if otherwise disposed of, would be a hazardous waste under 40 CFR, part 261, as enacted or hereafter amended, or any applicable Federal regulations. The notification requirement in this subsection does not apply to pollutants already reported under the self- monitoring requirements of the industrial users contribution permit.
   C.   Compliance; Periodic Report:
      1.   Any user subject to a categorical standard, after the compliance date of such pretreatment standard or, in the case of a new source, after commencement of the discharge into the POTW, shall submit to the city during the months of June and December, unless required more frequently in the pretreatment standard or by the city, a report indicating the nature and concentration of pollutants in the effluent which are limited by such pretreatment standards or permits. In addition, this report shall include a record of all daily flows which during the reporting period exceeded the average daily flow allowed in the wastewater contribution permit. At the discretion of the city and in consideration of such factors as high or low flow rates, holidays, budget cycles, etc., the city may agree to alter the months during which the above reports are to be submitted.
      2.   The city may impose mass limitations on users which are using dilution to meet applicable pretreatment standards or requirements, or in other cases where the imposition of mass limitations are appropriate. In such cases, the report required by subsection C1 of this Section shall indicate the mass of pollutants regulated by pretreatment standards in the effluent of the user. These reports shall contain the results of sampling and analysis of the discharge, including the flow and the nature and concentration, or production and mass where requested by the city, of pollutants contained therein which are limited by the applicable pretreatment standards. All analysis shall be performed in accordance with procedures established by the approval authority pursuant to section 304(h) of the Act and contained in 40 CFR, part 136, and amendments thereto or with any other test procedures approved by the approval authority. Sampling shall be performed in accordance with the techniques approved by the approval authority. Where 40 CFR, part 136, does not include a sampling or analytical technique for the pollutant in question, sampling and analysis shall be performed in accordance with the procedures set forth in the EPA publication, Sampling and Analysis Procedures for Screening of Industrial Effluents for Priority Pollutants, April 1977, and amendments thereto, or with any other sampling and analytical procedures approved by the approval authority.
   D.   Notice Of Change In Discharge: All permitted industrial users shall notify the POTW in writing within forty five (45) days of when their discharge changes significantly. A significant change shall include changes to the pollutant concentration levels, discharges of previously unreported pollutants, or flow increases of ten percent (10%) or greater.
   E.   Reports From Noncategorical Industrial Users: All industrial users not subject to categorical pretreatment standards shall provide appropriate reports to the POTW as the city may require.
   F.   Automatic Resampling: If the results of the industrial user's wastewater analysis indicate a violation has occurred, the user must notify the POTW within twenty four (24) hours of becoming aware of the violation and repeat the sampling and pollutant analysis and submit, in writing, the results of this repeat analysis within thirty (30) days after becoming aware of the violation.
   G.   Timing: Written reports required by the industrial user's wastewater contribution permit will be deemed to have been submitted to the POTW on the date postmarked if mailed via U.S. mail, postage prepaid. If not mailed as set forth, then the date of receipt of the report at the POTW shall govern.
   H.   Accidental Spill Or Slug Control Plans:
      1.   Industrial users that store hazardous substances shall not contribute to the POTW after the effective date hereof unless a spill prevention plan has been approved by the city. Approval of such plans shall not relieve the industrial user from complying with all other laws and regulations governing the use, storage, and transportation of hazardous substances.
      2.   At least once every two (2) years, the city must evaluate whether each significant industrial user needs a slug control plan to control slug discharges as defined in the definitions and abbreviations section of this Chapter. The plan shall contain at least the following elements:
         a.   Description of discharge practices, including nonroutine batch discharge;
         b.   Description of stored chemicals;
         c.   Procedures for promptly notifying the POTW of slug discharges, including any discharge that would violate a specific prohibition of this Section with procedures for follow-up written notification within five (5) days;
         d.   If necessary, procedures to prevent adverse impacts from accidental spills, including inspection and maintenance of storage areas, handling and transfer of materials, loading and unloading operations, control of plant site runoff, worker training, building of containment structures or equipment, measures for containing toxic organic pollutants (including solvents), and/or measures and equipment for emergency response; and
         e.   If necessary, follow-up practices to limit the damage suffered by the treatment plant or the environment. (Ord. 99-03, 11-16-1999)