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Pg. 2 (f) "Industrial wastes" shall mean all waterborne solids, liquids or •gaseous wastes resulting from any industrial manufacturing, trade, business or food processing operation or process, or from the development of any natural resource, or any mixture of these with water or domestic sewage as distinct from normal domestic sewage. (g) "Natural outlet" shall mean any outlet into a watercourse, pond, ditch, lake or other body of surface or groundwater. (h) "Normal domestic sewage" shall mean sewage in which concentration of suspended materials and five day 20°C B.O.D. is established at 240 parts per million each, by weight, on the basis of the normal daily contri- bution of twenty hundredths pounds per capita, per 100 gallons. (i) "Parts per million" shall mean a weight to weight ratio; the parts per million value multiplied by the factor 8.345 shall be equivalent to pounds per million gallons of water. (j) "Persons" shall mean any and all persons, natural or artificial, including any individual, firm, company, industry, municipal or private corporation. (k) "pH" shall mean the logarithm (base 10) of the reciprocal of the hydrogen ion concentration of a solution. It shall be determined by one • of the procedures outlined in "Standard Methods". (1) "Point of discharge" shall mean the point at which waste is discharged to the Rivanna Water and Sewer Authority sewers by the City of Charlottesville and/or the Albemarle County Service Authority. (m) "Properly shredded garbage" shall mean wastes from the prepara- tion, cooking and dispensing of food which have been shredded to such a degree that all particles will be carried under the flow conditions normally prevailing in the city sanitary sewer system, with no particle greater than one-half inch in any dimension. (n) "Sanitary sewer" shall mean a sewer which carries sewage and to which storm, surface and groundwaters are not intentionally admitted. (o) "Sewage" shall mean a combination of water -carried waste from residential, commercial, institutional and industrial establishments, together with such ground, surface and storm waters as may be present. (p) "Sewage treatment plant" shall mean any arrangement of devices and structures used for treating sewage. •(q) "Sewer" shall mean a pipe or conduit used to collect and carry away sewage or storm water run off from the generating source to treatment sewage plants or receiving streams.