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. . . or significantly contributes to a violation of any requirement of the City's NPDES and/or SDS Permit. The term includes sewage sludge use or disposal by the City in accordance with published regulations providing; guidelines under Section 405 of the Act or any regulations developed pursuant to the Solid Waste Disposal Act, the Clean Air Act, the Toxic Substances Control Act, or more stringent State criteria applicable to the method of disposal or use employed by the City. MPCA: Minnesota Pollution Control Agency. NATIONAL CATEGORICAL PRETREATMENT STANDARDS: Federal regulations establishing pretreatment standards for introduction of pollutants in publicly-owned wastewater treatment facilities, which are determined to be not susceptible to treatment by such treatment facilities, or would interfere with the operation of such treatment facilities, pursuant to Section 307(b) of the Act. NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM PERMIT (NPDES PERMIT): The system for issuing, conditioning and denying permits for discharge of pollutants, from point sources into the navigable waters, the contiguous zone, and the oceans by the Administrator of the Environmental Protection Agency pursuant to Section 402 and 405 of the Federal Water Pollution Control Act Amendments of 1972. NATURAL OUTLET: Any outlet into a water course, pond, ditch, lake or other body of surface or groundwater. NON-CONTACT COOLING WATER: The water discharged from any use as air conditioning, cooling or refrigeration, or during which the only pollutant added is heat. NORMAL DOMESTIC STRENGTH WASTE: Wastewater that is primarily introduced by residential users with a BOD5 concentration not greater than 200 mg/l, a suspended solids concentration not greater than 250 mg/l. OTHER WASTES: Garbage, municipal refuse, decayed wood, sawdust, shavings, bark, lime, sand, ashes, oil tar, chemicals, offal and other substances except sewage and industrial wastes. Eli: The logarithm of the reciprocal of the weight of hydrogen ions in grams per liter of solution. PLANT OPERATION: The utilities superintendent or a deputy, agent or representative thereof. PRETREATMENT: The treatment of wastewater from industrial sources prior to the introduction of the waste effluent into a publicly-owned treatment works (See Section 21). PROCESS WATER: Any water used in the manufacturing, preparation or production of goods, material or food. Process water is an industrial waste.