As used in this chapter:
"C. O. D." (denoting chemical oxygen demand) is a measure of the oxygen-consuming capacity of organic and inorganic matter present in wastewater as milligrams per liter (mg/1)
"Domestic sewage" means waterborne wastes normally discharging from the sanitary conveniences of buildings (including apartment houses and hotels), office buildings, factories and institutions, free from storm surface water and industrial wastes. "Normal domestic sewage" means normal sewage for the city.
"Garage" means solid wastes from the preparation, cooking and dispensing of food, and from the handling, storage and sale of produce.
"Industrial liquid wastes" means all waterborne 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 as distinct from normal domestic sewage. Industrial processes shall include but are not limited to production or refining of petroleum and petroleum products, processing of foods or beverages, the production of fertilizer, keeping of livestock and operation of dairies, manufacture of paper, production or dyeing of textiles, production of soap or detergents or chemicals, cleaning of tanks, tank cars or barrels, plating of metals, processing or reclamation of refuse, all kinds of manufacturing and other similar operations, the washing of equipment or spaces used in industrial operations and the disposal of waste products contained in Liquids from laundries, hospitals, grocery stores, restaurants, and other public establishments. Unless the sewage contains the waste substances above described, industrial liquid waste shall not include wastewater resulting from the operation of hotels, motels, schools or other retail establishments other than those listed above, nor shall industrial liquid waste include wastewater from the operation of vehicle service stations, wash racks or garages. Liquid industrial waste shall not include any domestic sewage from industrial or retail establishments.
"Interference with any sewage treatment process" means any condition or combination of conditions which causes degradation of the operational efficiency of a sewage treatment process.
"pH" means the logarithm (base ten) of the reciprocal of the hydrogen ion concentration of a solution.
"Public sewer" means a sewer in which all owners of abutting properties shall have equal rights, and is controlled by public authority.
"Sanitary sewer" or "sewerage system" means a public sewer which transports sewage and to which stormwater, surface water and groundwater are not intentionally admitted.
"Settleable solids" means those solids which settle during a preselected period of time as expressed in milliliters per liter of sample.
"Sewage" means a combination of the water-carried wastes from residences, business buildings, institutions and industrial establishments.
"Sewage treatment plant" or "sewage works" means any facilities, devices and structures used for receiving and treating sewage from the sanitary sewer system.
"Standard methods" means the laboratory procedures set forth in the latest edition, at the time of analysis, of "Standard Methods for the Examination of Water and Sewage," as prepared, approved and published jointly by the American Public Health Association and American Water Works Association and the Water Pollution Control Federation.
"Storm sewer" means a sewer which carries stormwaters, surface waters and drainage, but excludes sewage and polluted industrial wastes.
"Trap" means a device for retaining sand, silt, grit, mineral material, petroleum solvent, grease or oil by gravity differential separation from wastewater and of a design and capacity approved by the city.
"Unpolluted process water" means any water or waste containing none of the following: emulsified grease or oil; acid or alkali; phenols, or other substances imparting taste and odor to receiving water; toxic substances in suspension, colloidal state or solution; and noxious or odorous gases. (Prior code § 4-3-47 (2))