51-81 New Chpt 913 - Streets - Muni & private sewers & drains

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requiremehts in ~;uch quantities as to constitute a .;iKnificant load on the wastewater treatment works. ~4) Unusual volume or concentration of wastes con- ~;[itutin~ "slugs" as defined herein. (5) Any unpolluted water including, but not limited To, cooling water, storm water, or groundwater. (f) Limitations on Wastewater Strength. (1) Federal Pretreatment Standards. Federal pretreat-ment s~andards promulgated by the U. S. Environmental Protection Agency (EPA) pursuant to the Act shall be met by.all users which are subject to such standards in any instance where they are more stringent than the limita- tions in this Ordinance unless the City Engineer has applied for, and obtained from the OEPA approval to modify the specific limits in the federal pretreatment standards. When requested, an application for modification of the federal pretreatment standards will be considered for submitzal by the City Engineer when the City's wastewater treatment system achieves consistent removal of the pollutants. "Consistent re- moval'' shall mean reduction in the amount of pollutant or alteration of the nature of a pollutant which is in the influent to the wastewater treatment system to a less toxic or harmless state by the time it is discharged in the effluent. The reduction or alteration must be achieved in 95 percent of the samples taken when measured according =o the procedures set forth in 40 CFR Section 403.7(c)(2) of the "General Pretreatment Regulations for Existing and New Sources of Pollution." <2) State Recuirements. State requirements and limitations on discharges shall be met by all users 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. (3) City's Rizht of Revision. The City reserves the right =o establish by ordinance more stringent limitations or requirements on discharges to the wastewater disposal system if deemed necessary to comply With the objecuives presented in Section 250.00 of this chapter. (A) Dilution. No user shall increase the use of process wa~er or, in any way, attempt to dilute a discharge as a ~artial or conpieue subset=ute for adequate treatment to achieve compliance with the limitations contained herein, contained in the federal pre:rea~ment standards, or contained in any state requirements. (g) Accidennal Discharges. Each user shall provide protection from accidental discharge of prohibited materials or other substances regulated by this chapter. Where necessary, facilities to prevent acciaenuai discharge of prohibited materials shall be provided and ~intaine~ ag ~he owner or user's own cost and expense. Detailed olans showing facilities and operating procedures to provide this pro:ec:ion shall be submitted to the City Engineer review, and shall be approved by the City Engineer before construction of the facility. Revzew eno approval of such plans and operating procedures shall not re!love the industrial user from the responsibility to modify ~he :~ user's facility as necessary to meet the requirements of this Chapter. (h) If any waners or wastes are discharged, or are proposed to be discharged [o the public sewers, which waters contain the substances or possess zhe characteristics enumerated in Subd. 3 and Subd. 4 of this Sec:ion, and which in ~he judgement of the City Engineer may have a deleterious effec~ upon the wastewater disposal system processes, equipmenn or recezving waters, or which otherwise create a hazard to life or cons5i~ute a public nuisance, the City Engineer may: (1) Reject the wastes, (2) Require pretreatmen~ to an acceptable condition. for discharge to the public sewers, (3) Require control over the quantities and rates of discharge, and/or, -9-