As used in this chapter:

"BOD" (denoting "biochemical oxygen demand") means the quantity of oxygen utilized in the biochemical oxidation of organic matter under statutory standard laboratory procedure in five days at twenty (20) degrees Celsius, expressed in milligrams per liter.

"Building sewer" means the extension from the building drain to the public sewer or other place of disposal.

"Industrial or commercial waste" means water-carried wastes originating from industrial or commercial processes, trade or businesses as distinct from water-carried wastes originating from a residential user.

"Operation and maintenance" means those activities undertaken to achieve the required level of sewage collection system and sewage treatment plant performance and to extend the operating life of plant and collection system components.

"Replacement" means obtaining and installing equipment, accessories or appurtenances which are necessary during the design or useful life, whichever is longer, of the sewage treatment plant and collection sewers to maintain the capacity and performance for which the plant and system were designed and constructed.

"Residential user" means user of a single-family dwelling.

"Sanitary sewer" means a sewer which carries sewage and to which storm, surface and ground water are not intentionally admitted.

"Side sewer" means those public sanitary sewers which extend from a tee or wye in the public sewer to the property line.

"Suspended solids" means the solid residual resulting from filtering and drying a sample of wastewater in accordance with laboratory procedures dictated by Standard Methods for the Examination of Water and Wastewater, latest edition, expressed in milligrams per liter.

"Unusual strength of character" means any wastewater or combination of wastewaters which:

1. Measures greater than three hundred (300) mg/L BOD);

2. Measures greater than three hundred (300) mg/L suspended solids;

3. Measures less than pH 6.0 or greater than pH 9.0; and

4. Demonstrates toxicity to or inhibition of sewage treatment processes.

"User charge" means a charge levied on the user of the sewage collection system and sewage treatment plant for the user’s proportionate share of the cost of operation, maintenance and replacement of these facilities. (Prior code § 4.050)