For the purpose of this chapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
   BOD (denoting BIOCHEMICAL OXYGEN DEMAND). The quantity of oxygen utilized in the biochemical oxidation of organic matter under standard laboratory procedure in five days at 20°C, expressed in parts per million by weight.
   BUILDING DRAIN. That part of a drainage system which carries the wastewater inside the walls of the building and conveys it to the building sewer, beginning five feet outside the inner face of the building wall.
   BUILDING SEWER. The extension from the building drain to the public sewer or other place of disposal.
   CHLORINE DEMAND. The difference between the amount of chlorine added to water or wastewater and the amount of residual chlorine remaining at the end of a specified contact period.
   COD (denoting CHEMICAL OXYGEN DEMAND). The quantity of oxygen consumed from a chemical oxidant in a specific test.
   COMBINATION SEWER or COMBINED SEWER. A sewer receiving both surface run-off and sewage.
   COMPATIBLE POLLUTANT. A substance amendable to treatment in the wastewater treatment plant such as BOD, suspended solids, pH and fecal coliform bacteria, plus additional pollutants identified in the NPDES permit of the wastewater treatment plant which was designed to treat such pollutants and in fact does remove such pollutants to an acceptable degree. These additional pollutants may include COD, total organic carbon, phosphorus and phosphorus compounds, nitrogen and nitrogen compounds, fats, oils, and greases of animal or vegetable origin.
   CRITICAL MATERIALS. The organic and inorganic substances, elements or compounds listed in the register compiled by the Water Resources Commission of the Department of Natural Resources of the State of Michigan and the Federal Register compiled by the Environmental Protection Agency.
   DAILY AVERAGE. Based upon a minimum of eight grab samples at one-hour intervals.
   DOMESTIC SEWAGE. Sewage that is coming from households not from businesses or industry.
   GARBAGE. Solid wastes from the preparation, cooking and dispensing of food, and from the handling, storage, processing and sale of produce.
   INCOMPATIBLE POLLUTANT. Any pollutant which is not a compatible pollutant as defined in this section.
   INDUSTRIAL COST RECOVERY. A charge imposed on an industrial user to reflect its share of the amount of grant funds received to construct wastewater treatment works as provided under 33 U.S.C. §§ 1251 et seq. (Pub. L. No. 92-500), and the regulations promulgated thereunder.
   INDUSTRIAL USER. Any nongovernmental or nonresidential user of the wastewater treatment system, identified in the “Standard Industrial Classification Manual” (1972 Edition) under Divisions A, B, C, E or I.
   INDUSTRIAL WASTES. The liquid wastes, solids, or semisolids from nondomestic processes as distinct from domestic sewage.
   NATURAL OUTLET. Any outlet into a watercourse, pond, ditch, lake, or other body of water, either surface or ground water.
   NONDOMESTIC SEWAGE. Sewage that is coming from offices, business or industry, not from households.
   OPERATION AND MAINTENANCE COSTS. The expenditures required for operating, maintaining and replacement of the treatment works.
   pH. The logarithm of the reciprocal of the weight of hydrogen ions in grams per liter of solution. A neutral pH is 7.0; below 7.0 is acidic, above 7.0 is alkaline.
   PROPERLY SHREDDED GARBAGE. The wastes from the cooking, preparation and dispensing of food that has been cut or shredded to such a degree that all particles will be carried freely under flow conditions normally prevailing in public sewers, with no particle greater than one-half inch in any dimension.
   PUBLIC SEWER. A sewer in which all owners of abutting property have equal rights and is controlled by public authority.
   REPLACEMENT COSTS. The expenditures for obtaining and installing equipment, accessories or appurtenances during the useful life of the treatment works necessary to maintain the capacity and performance for which such works are designed and constructed.
   SANITARY SEWAGE. Any liquid wastes discharged from residences, business buildings and institutions, as distinct from industrial wastes with strengths not exceeding the limits set forth in § 51.04.
   SANITARY SEWER. A sewer which carries domestic and nondomestic sewage and to which storm and surface waters are not intentionally admitted.
   SEWAGE TREATMENT PLANT. Any arrangement of devices and structures used for treating sewage.
   SEWAGE WORKS. All facilities for collecting, pumping, treating and disposing of sewage.
   SEWAGE. Any combination of water-carried wastes from residences, business and commercial buildings, institutions, and industrial establishments.
   SEWER. Any pipe, tile, tube, or conduit for carrying sewage.
   SLUG. Any discharge of water or wastewater which in concentration of any given constituent or in quantity of flow exceeds for any period of duration longer than 15 minutes more than five times the average 24 hour concentration or flows during normal operation.
   STORM SEWER or STORM DRAIN. A sewer which carries storm and surface waters and drainage but which excludes sewage and polluted industrial wastes.
   SURCHARGE. The additional treatment charges made by the city for the treatment of wastewater containing pollutants in excess of normal domestic wastewater.
   SUSPENDED SOLIDS. The solids that either float on the surface of or are suspended in water, sewage, or other liquids and which are removable by laboratory filtering.
   SWRC. The State Water Resources Commission.
   WATERCOURSE. A channel in which a flow of water occurs, either continuously or intermittently.
(1990 Code, § 2.81)  (Am. Ord. 586, passed 12-14-2009)