28 - Article III Chapter 34 Wastewater Discharge and Disposal Revisions

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Interference. Any inhibition or disruption of the POTW treatment processes or operations which contributes to a violation of any requirements or limitations of the city's NPDES permit. The term also includes any prevention of sludge use or disposal by the POTW in accordance with Section 405 of the Act (33 USC 1345) or any criteria, guidelines or regulations developed pursuant to the Solid Waste Disposal Act (SWDA), the Clean Air Act, the Toxic Substances Control Act or more stringent state criteria (including those contained in any state sludge management plan prepared pursuant to Title IV of SWDA applicable to the methods of disposal or use employed by the POTW). May. May is permissive or discretionary. Maximum allowable discharge limit. The maximum concentration of any pollutant discharged to the POTW based on daily or monthly averages or a single grab sample as established by the city based on technically based local limits development, national categorical pretreatment standards, or best professional judgment of the city. If state, federal, and local discharge limits are different, then the most stringent limit shall apply. Dilution of the wastestream to achieve an allowable discharge limit is prohibited. Milligrams per liter (mg/1). A weight -to -volume ratio equivalent to parts per million. Monthly Average. The sum of all discharges measured during a calendar month divided by the number of daily discharges measured during that month. Monthly Average Limit. The highest allowable average of daily discharges measured over a calendar month. National pollutant discharge elimination system (NPDES) permit. A permit issued pursuant to Section 402 of the Act (33 USC 1342). Natural outlet. Any outlet into a watercourse, ditch, lake or other body of surface water or groundwater. New source. Any user who commences discharge to the POTW after the publication of a proposed federal pretreatment standard under section 307(c) of the Act applicable to such user and thereafter promulgated in accordance with that section, provided that: (1) a. The facility is constructed at a site at which no other source is located; or b. The facility totally replaces the process or production equipment that causes the discharge of pollutants at an existing source; or c. The production or wastewater generating processes of the facility are substantially independent of an existing source at the same time. In determining whether these are substantially independent, factors such as the extent to which the new facility is integrated with the existing plant, and the extent to which the new facility is engaged in the same general type of activity as the existing source should be considered. Page 9 of 45