§ 13.16.120. Wastewater and its characteristics.

A.

"BOD" (denoting Biochemical Oxygen Demand) means the quantity of oxygen utilized in the biochemical oxidation of organic matter under standard laboratory procedure in five days at twenty degrees Centigrade, expressed in milligrams per liter.

B.

"Effluent criteria" are defined in any applicable NPDES permit.

C.

"Floatable oil" means and is oil, fat or grease in a physical state such that it will separate by gravity from wastewater by treatment in an approved pretreatment facility. A wastewater shall be considered free of floatable fat if it is properly pretreated and the wastewater does not interfere with the collection system.

D.

"Garbage" means solid wastes from the domestic and commercial preparation, cooking and dispensing of food and from the handling, storage and sale of produce.

E.

"Industrial waste" means any solid, liquid or gaseous substance discharged, permitted to flow or escaping from any industrial, manufacturing, commercial or business establishment or process or from the development recovery or processing of any natural resource as distinct from sanitary sewage.

F.

"Major contributing industry" means an industrial user of the publicly owned treatment works that:

1.

Has a flow of fifty thousand gallons or more per average work day; or

2.

Has a flow greater than ten percent of the flow carried by the municipal system receiving the waste; or

3.

Has in its waste, a toxic pollutant in toxic amounts as defined in standards issued under Section 307(a) of the Federal Act; or

4.

Is found by the permit issuance authority, in connection with the issuance of the NPDES permit to the publicly owned treatment works receiving the waste, to have significant impact, either singly or in combination with other contributing industries, on that treatment works or upon the quality of effluent from that treatment works.

G.

"Milligrams per liter" means a unit of the concentration of water or wastewater constituent. It is 0.001 g of the constituent in 1.00 ml of water. It has replaced the unit formerly used commonly, parts per million, to which it is approximately equivalent, in reporting the results of water and wastewater analysis.

H.

"pH" means the logarithm (base 10) of the reciprocal of the hydrogen-ion concentration expressed by one of the procedures set forth in the most recent edition of "Standard Methods for the Examination of Water and Wastewater" published jointly by the Americal Public Health Association, the American Water Works Association and the Water Pollution Control Federation.

I.

"Population equivalent" is a term used to evaluate the impact of industrial or other waste on a treatment works or stream. One population equivalent is one hundred gallons of sewage per day, containing 0.17 pounds of BOD and 0.20 pounds of suspended solids.

J.

"ppm" means parts per million by weight.

K.

"Properly shredded garbage" means the wastes from the preparation, cooking and dispensing of food that have been shredded to such a degree that all particles will be carried freely under the flow conditions normally prevailing in public sewers, with no particle greater than one-half inch (1.27 centimeters) in any dimension.

L.

"Sewage" is used interchangeably with "wastewater."

M.

"Slug" means any discharge of water, sewage or industrial wastes which in concentration of any given constituent or in quantity of flow exceeds for any period of duration longer than fifteen minutes more than five times the average twenty-four-hour concentration or flows during normal operation.

N.

"Suspended solids" means solids that either float on the surface of, or are in suspension in water, sewage or industrial waste and which are removable by a laboratory filtration device. Quantitative determination of suspended solids shall be made in accordance with procedures set forth in "Standard Methods."

O.

"Unpolluted water" is water of quality equal to or better than the effluent criteria in effect or water that would not cause violation of receiving water quality standards and would not be benefited by discharge to the sanitary sewers and wastewater treatment facilities provided.

P.

"Wastewater" means the spent water of a community. From this standpoint of course, it may be a combination of the liquid and water carried wastes from residences, commercial buildings, industrial plants and institutions, together with any groundwater, surface water and stormwater that may be present.

Q.

"Water quality standards" are defined in the Water Pollution Regulations of Illinois.

(Ord. 665 Art. I, §7, 1988).