For the purpose of this chapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
ACT. The Federal Water Pollution Control Act, also referred to as the Clean Water Act, as amended, 33 U.S.C. §§ 1251 et seq.
BOD5 or BIOCHEMICAL OXYGEN DEMAND. The quantity of oxygen utilized in the biochemical oxidation of organic matter under standard laboratory procedures in five days at 20°C and as expressed in terms of milligram per liter (mg/l).
BUILDING DRAIN. The point of a building which conveys wastewater to the building sewer, beginning immediately outside the building wall.
DEBT SERVICE CHARGE. A charge to users of the wastewater treatment facility for the purpose of repaying capital costs.
EQUIVALENT RESIDENTIAL UNIT (ERU). A unit of wastewater volume of 100 gallons per day at a strength not greater than NDSW.
INDUSTRIAL USER. This term includes the following:
(1) Any entity, as defined in the Standard Industrial Classification Manual (latest edition) as categorized, that discharges wastewater to the public sewer, including:
(a) Division A: Agriculture, Forestry, and Fishing;
(b) Division B: Mining;
(c) Division D: Manufacturing;
(d) Division E: Transportation, Communications, Electric, Gas, and Sanitary Sewers; and
(e) Division I: Services.
(2) Any user whose discharges, single or by interaction with other wastes, contaminate the sludge of the wastewater treatment system, injure or interfere with the treatment process, create a public nuisance or hazard, have an adverse effect on the waters receiving wastewater treatment plant discharges, exceed NDSW limitations, or exceed normal residential unit volumes of wastewater.
INFILTRATION/INFLOW (I/I). Water other than wastewater that enters the sewer system from the ground or from surface runoff, as defined in Minnesota Rules.
MPCA. Minnesota Pollution Control Agency.
NATIONAL CATEGORICAL PRETREATMENT STANDARDS. Federal regulations establishing pretreatment standards for introduction of pollutants in publicly owned wastewater treatment facilities. (Section 307(b) of the Act, 33 U.S.C. § 1317b.)
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) PERMIT. A permit issued by the MPCA setting limits on pollutants that a permittee may legally discharge pursuant to §§ 402 and 405 of the Act, 33 U.S.C. §§ 1342 and 1345.
NATURAL OUTLET. Any outlet, including storm sewers and combined sewers, which flows into a body of surface water or ground water.
NONRESIDENTIAL USER. A user of the treatment facility whose building is not used as a private residence and discharges NDSW.
NORMAL DOMESTIC STRENGTH WASTE (NDSW). Wastewater that is primarily introduced by residential users with BOD5 concentrations not greater than 200 mg/l and total suspended solids (TSS) concentrations not greater than 240 mg/l.
OPERATION, MAINTENANCE, AND REPLACEMENT COSTS (OM&R). Expenditures necessary to provide for the dependable, economical, and efficient functioning of the treatment facility throughout its design life, including operator training and permit fees. Replacement refers to equipment replacement costs, not the cost of future replacement of the entire facility.
RESIDENTIAL USER. A user of the treatment facility whose building is used primarily as a private residence and discharges NDSW.
SEWER. A pipe or conduit that carries wastewater or drainage water.
(1) BUILDING SEWER. The extension from the building drain to the public sewer or other place of disposal, also referred to as a service connection.
(2) SANITARY SEWER. A sewer designed to carry only liquid and water-carried wastes from residential, nonresidential, and industrial sources, together with minor quantities of I/I.
(3) STORM SEWER. A sewer intended to carry unpolluted surface and subsurface water from any source.
SEWER SERVICE CHARGE. The total of the user charge and the debt service charge.
SLUG. A discharge of water or wastewater which in concentration or in quantity of flow exceeds for any period of duration longer than 15 minutes more than five times the average 24-hour concentration of flows during normal operation.
STATE DISPOSAL SYSTEM (SDS) PERMIT. A permit issued by the MPCA pursuant to M.S. § 115.07, as it may be amended from time to time, for a disposal system as defined by M.S. § 115.01, Subd. 5, as it may be amended from time to time.
TOTAL SUSPENDED SOLIDS (TSS). The total suspended matter that either floats on the surface of or is in suspension in water, wastewater, or other liquids and is removable by laboratory filtering as prescribed in Standard Methods for the Examination of Water and Wastewater (latest edition).
UNPOLLUTED WATER. 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. An example could be noncontact cooling water.
USER CHARGE. A charge to users of a treatment facility for the user’s proportionate share of the cost of operation and maintenance, including replacement.
WASTEWATER. Liquid and water-carried wastes from residential, nonresidential, and industrial users, together with any ground water, surface water, and storm water that may be present.
WASTEWATER TREATMENT FACILITIES or TREATMENT FACILITIES. The land, devices, facilities, structures, equipment, and processes owned or used by the city for the purpose of the transmission, storage, treatment, recycling, and reclamation of municipal wastewater and the disposal of residues resulting from such treatment.
(Prior Code, § 53.01) (Ord. 181, passed 8-10-1993)