§ 47-186. Definitions.

For the purpose of this article, the following words and terms shall have the following meanings unless the context indicates otherwise:

Average quality. The arithmetic average of all the "daily determinations of concentration," as that term is defined herein, made during a calendar month.

BOD (biochemical oxygen demand). The quantity of oxygen consumed from the biochemical oxidation of organic matter under standard laboratory conditions for five days at a temperature of 20 degrees Celsius, reported in mg/l, as described in 40 CFR part 136.

Categorical pretreatment standards. See "pretreatment standards."

CFR. The Code of Federal Regulations. True copies of 40 CFR part 403 and 40 CFR part 136 are on file in the office of the city secretary.

COD (chemical oxygen demand). The quantity of oxygen consumed from a chemical oxidation of inorganic and organic matter present in water or wastewater, expressed in mg/l, as described in 40 CFR part 136.

Control authority. This term has the meaning established in 40 CFR 403.12.

Daily composite sample. A sample of effluent collected in several portions during a normal operating day.

Daily composite sample quality. The concentration of some parameter tested in a "daily composite sample," as that term is defined herein.

Daily determination of concentration. For composite samples, "daily determination of concentration" shall be the same as "daily composite sample quality," as the term is defined herein. For grab samples, the daily determination of concentration shall be the arithmetic average of all "grab sample qualities," as that term is defined herein, determined for any twenty-four-hour period.

Domestic waste. A typical, residential-type waste which requires no pretreatment under the provisions of this article and does not contain industrial waste.

EPA. The Environmental Protection Agency.

Establishment, plant. Any establishment or plant producing industrial waste that is discharged into the sewer system.

Grab sample. An individual sample of effluent collected in less than 15 minutes.

Grab sample quality. The concentration of some parameter tested in a "grab sample," as that term is defined herein.

Industrial user. Any person that discharges industrial waste into the sanitary sewer system.

Industrial waste. Any waterborne solid, liquid or gaseous waste, resulting from any production, industrial, manufacturing or food processing operation or from the development, recovery or processing of any natural resource including waste that is required to be pretreated by this article or plumbing code.

Industrial waste permit or permit. Any permit issued pursuant to this article.

Interference. This term has the meaning established in 40 CFR 403.3(i).

Milligrams per liter (mg/l). The same as parts per million (ppm). The milligram per liter value multiplied by the factor 8.34 gives the ratio in pounds per million gallons of water.

New source. This term has the meaning established in 40 CFR 403.3(k).

NPDES permit. A permit issued to the POTW pursuant to section 402 of the Clean Water Act.

Pass through. A discharge which exits the POTW into waters of the United States in quantities or concentrations which, alone or in conjunction with a discharge or discharges from other sources, is a cause of a violation of any requirement of the POTWs NPDES or state discharge permit.

Permittee, permit holder. Any person who owns, operates, possesses or controls an establishment or plant being operated under a valid industrial waste permit.

pH determination. Determination of pH made according to 40 CFR part 136.

pH value. The logarithm of the reciprocal of the hydrogen ion concentration in grams per liter; i.e.:

			1
pH	=	Log 10	_____
			[H+]

 

Plant, establishment. See "establishment, plant."

Pretreatment requirements. Any substantive or procedural pretreatment requirement promulgated by the EPA, other than a pretreatment standard.

Pretreatment standards. Any regulation applicable to industrial users containing pollutant discharge limits promulgated by the EPA in accordance with sections 307(b) and (c) of the Clean Water Act.

Publicly owned treatment works or POTW. All city wastewater treatment facilities, wastewater lift stations, and all wastewater collection and/or conveyance systems. The term is synonymous with "sanitary sewer system" below.

Sample tap. A physical connection on an industrial user's discharge to the city's sewer for the purpose of obtaining a sample.

Sample well. A physical connection on an industrial user's discharge sewer that is constructed to allow access for sampling and inspection.

Sanitary sewer system, sewers, sewage works, sewer system. All city facilities for collecting, conveying, pumping, treating and disposing of sanitary sewage and industrial wastes. For the purposes of this article, however, waterways shall not be included in this definition.

Significant industrial user.

(1)

All industrial users subject to EPA categorical pretreatment standards.

(2)

Any other industrial user that discharges an average of 25,000 gallons or more of process wastewater (excluding sanitary, noncontact cooling and boiler blowdown wastewater) per day or contributes a process wastestream equal to or greater than five percent of the dry weather flow or organic capacity of the city wastewater treatment plant into which it discharges.

(3)

Industrial users that are designated by the control authority due to the potential to adversely affect the POTWs operation or cause a violation of any pretreatment standard or requirement.

Suspended solids (SS). Solids measured in mg/l that either float on the surface of or are in suspension in water, wastewater, or other liquids, and which are largely removable by a laboratory filtration device, as defined in 40 CFR part 136.

User charges. Charges established under article III of this chapter for discharging wastes into the sanitary sewer system.

(Code 1968, § 49-145; Ord. No. 74-222, § 1, 2-6-74; Ord. No. 77-499, § 7, 3-15-77; Ord. No. 83-1139, § 1, 7-26-83; Ord. No. 90-635, § 164, 5-23-90; Ord. No. 92-1309, § 2, 9-30-92; Ord. No. 93-514, § 123, 5-5-93)