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discharge into navigable waters of the United States pursuant to Sections 402 and <br />405 of the Act. <br />25. Natural Outlet. Any outlet, including storm sewers and combined sewers, <br />which overflow into a watercourse, pond, ditch, lake or other body of surface <br />water or ground water. <br />26. Non - Contact Cooling Water. The water discharged from any use such as <br />air conditioning, cooling or refrigeration, or during which the only pollutant <br />added, is heat. <br />27. Normal Domestic Strength Waste. Wastewater that is primarily <br />introduced by residential users with a BODs concentration not greater than 250 <br />mg /1 and a suspended solids (TSS) concentration not greater than 302mg /1. <br />28. Person. Any individual, firm, company, association, society, corporation, <br />or group. <br />29. "pH" The logarithm of the reciprocal of the concentration of hydrogen <br />ions in terms of grams per liter of solution. <br />30. Pretreatment. The treatment of wastewater from industrial sources prior <br />to the introduction of the waste effluent into a publicly owned treatment works. <br />(See Sec. 23.) <br />31. Properly Shredded Garbage. The wastes from the preparation, cooking <br />and dispensing of food that have been shredded to such a degree that all particles <br />will be carried freely under the flow conditions normally prevailing in public <br />sewers with no particle greater than %a inch (1.27 cm) in any dimension. <br />32. Sewage. The spent water of a community. The preferred term is <br />wastewater. <br />33. Sewer. A pipe or conduit that carries wastewater or drainage water. <br />A. Collection Sewer. A sewer whose primary purpose is to collect <br />wastewaters from individual point source discharges and <br />connections. <br />B. Combined Sewer. A sewer intended to serve as a sanitary sewer <br />and a storm sewer. <br />C. Force Main. A pipe in which wastewater is carried under pressure. <br />D. Interceptor Sewer. A sewer whose primary purpose is to transport <br />wastewater from collection sewers to a treatment facility. <br />