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(s) "Mgjor Contributing Industry" means any industry whose flow <br />exceeds 50,000 gallons per day or who is subject to pretreatment require- <br />ments for the removal of incompatible pollutants as defined in this <br />section. <br /> <br /> (t) "Maximum Permissible Dose" shall be a dose of radiation to any <br />part of the body, internal or external, or both, that in the light of <br />present knowledge, is not expected to cause appreciable bodily injury to <br />a person at any time during his lifetime. <br /> <br /> (u) "National Pollutant Discharge Elimination System" {NPDES) means <br />the program for issuing, conditioning and denying permits for the <br />discharge of pollutants from point sources into the navigable waters, the <br />contiguous zone, and the oceans pursuant to section 402 of the Act. <br /> <br /> (v) .... <br /> NH3 (Nitrogen as Ammonia) shall mean the initial product in <br />the decomposition of nitrogenous organic matter as measured by using <br />standard laboratory methods, as set out herein, expressed in mg/1. <br /> <br /> (w) "PPM" means parts per million by weight expressed in pounds. <br /> <br /> (x) "Person" means any individual, firm, company, partnership, <br />corporation, association, group, or society, and includes the State of <br />North Carolina. and agencies, districts, commissions, and political <br />subdivisions created by, or pursuant to, state law. <br /> <br /> (y) "pH" means the logarithm (base 10) of the reciprocal of the <br />concentration of hydrogen ions in grams per liter of solution and <br />indicates the degree of acidity or alkalinity of a substance. A pH value <br />of 7.0 is neutral, above 7.0 is alkaline and below 7.0 is acid. <br /> <br /> (z) "Pretreatment" means application of physical, chemical, and <br />biological processes to reduce the amount of pollutants in or to alter <br />the nature of the pollutant properties of wastewater prior to discharging <br />such wastewater into the publicly owned wastewater treatment system. <br /> <br /> (aa) "Pretre~tment standards" means all applicable federal rules and <br />regulations implementing section 307 of the Act, as well as any <br />nonconflicting state or local standards. In cases of conflicting <br />standards or regulations, the more stringent thereof shall be applied. <br /> <br /> (bb) "Properly shredded garbage" means the wastes from the <br />preparation, cooking, and dispensing of food that have been shredded to <br />such degree that all 'particles will be carried freely under the flow <br />conditions normally prevailing in public sewers, with no particle greater <br />than one-half (1/2) inch in any dimension. <br /> <br /> (cc) "Receiving stream" means a body of water, stream, or watercourse <br />receiving or formed by the discharge of waters from the waste treatment <br />plant. <br /> <br /> (dd) "Residential User" means a user consisting of a single family <br />household whether it is a single family dwelling or one unit of any <br />multiple family dwelling, structure or apartment building, and which the <br />ultimate use of the system is for household purposes only. <br /> <br /> (eel "Sanitary sewer" means a sewer intended to receive domestic <br />sewage and industrial waste, except that of the type expressly prohibited <br />by this article, without the admixture of surface and storm water. <br /> <br /> I <br /> <br /> <br />