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e e P. Existing Source - Any source of discharge, the construction or operation of which commenced prior to the publication of proposed categorical pretreatment which will be applicable to such source if the standard is thereafter promulgated in accordance with Section 307 of the act. Q. Grab Sample - A sample collected over a period of time not to exceed 15 minutes from a waste stream without regard to flow of the waste stream. R. Indirect Discharge or Discharge - The introduction of a non-domestic pollutant into the POTW from any non-domestic source regulated under Section 307 (b), (c) or (d) of the act. S. Industrial User or User - An industry or business which discharges wastewater into the City's wastewater treatment plant. A source of direct discharge. T. Industrial Waste Questionnaire - The document provided by the City to all potential industrial users on which basic information and data are documented describing the applicant's production process, raw materials, and other information as deemed necessary by the City to accurately assess the nature of any potential waste discharges. U. Industrial Wastes - All water-borne solids, liquids, or gaseous wastes resulting from any industrial, manufacturing, or food processing operation or process, or from the development of any natural resource, or any mixture of these with water or domestic sewage distinct from domestic sewage. V. Instantaneous Maximum Allowable Discharge Limit - The maximum concentration (or loading) of a pollutant allowed to be discharged at any time, determined from the analysis of any discrete or composite sample collected, independent of the industrial flow rate and the duration of the sampling event. W. Interference - A discharge which alone or in conjunction with a discharge or discharges from other sources: 1.) inhibits or disrupts the POTW , its treatment process or operations or its sludge processes, use or disposal; and 2.) therefore is a cause of a violation of City's TPDES permit or of the prevention of sewage sludge use or disposal in compliance with any of the following statutory / regulatory provisions or permits issued thereunder ( or more stringent state or local regulations) : Section 405 of the Clean Water Act; the Solid Waste Disposal Act ( SWDA), including Title II ( Resource Conservation and Recovery Act - RCRA; and State regulations contained in any 5