Ordinance 3070-08 - Laserfiche WebLink

zinc 4.00 mg/L nonpolar fats, oils, 200 mg/L and grease (NPFOG) The above limits apply at the point where the wastewater is discharged to the POTW (end of the pipe). Categorical pretreatment standards apply at the end of the process. However, the Director may elect to have local limits apply after pretreatment and/or prior to mixing with dilution flows. All concentrations for metallic substances are for "total" metal unless indicated otherwise. The Director may impose mass limitations in addition to (or in place of) the concentration based limitations above. Where a user is subject to a categorical pretreatment standard and a local limit for a given pollutant, the more stringent limit or applicable pretreatment standard shall apply. The City Council authorizes the Director to revise local limits. 2.5 pH Effluent Limitations Under Continuous Monitoring A. Where a permittee continuously monitors the pH of wastewater discharged to the City's sewer system pursuant to a requirement in their discharge permit, the permittee shall maintain the pH of such wastewater within the range set forth in the permit, except excursions from the range are permitted subject to the following limitations: (1). The total time during which the pH values are outside the required range of pH values shall not exceed 2 hours in any calendar month; and (2). No individual excursion from the allowable range of pH values shall exceed 15 minutes. B. At no time will the pH value be outside the allowable range of pH values by more than one pH unit. C. At no time shall the pH be less than 5.0 pH units. D. All batch discharges shall be in compliance with the allowable pH range. E. For the purposes of this Ordinance, an excursion is an unintentional and temporary incident in which the pH value of the discharged wastewater exceeds the range set forth in the user's discharge permit. 18