For the purpose of this chapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
AUTHORITY. The City of Hoyt Lakes, Minnesota.
BIOCHEMICAL OXYGEN DEMAND (BOD). The quantity of oxygen, expressed in mg/l, utilized in the biochemical oxidation of organic matter under standard laboratory procedures in five days at 20°C.
BUILDING DRAIN. The part of the lowest horizontal piping of a drainage system which receives the discharge from soil, waste and other drainage pipes inside the walls of a building and conveys it to the building sewer beginning three feet outside the building wall.
(1) BUILDING DRAIN - SANITARY. A building drain which conveys sanitary or industrial sewage only.
(2) BUILDING DRAIN - STORM. A building drain which conveys storm water or other clearwater drainage but no waste water.
BUILDING SEWER. The extension from the building drain to the public sewer or other place of disposal (also called HOUSE CONNECTION).
(1) BUILDING SEWER - SANITARY. A building sewer which conveys sanitary or industrial sewage only.
(2) BUILDING SEWER - STORM. A building sewer which conveys storm water or other clearwater drainage, but no sanitary or industrial sewage.
CLASSES OF USERS. The division of waste water treatment customers by waste characteristics, and process or discharge similarities.
(1) COMMERCIAL. Includes transient lodging, retail and wholesale establishments or places engaged in selling merchandise for personal, household or industrial consumption and/or rendering services to others.
(2) GOVERNMENTAL. Includes legislative, judicial, administrative and regulatory activities of federal, state and local governments, such as courthouses, police and fire stations, city halls and similar governmental users.
(3) INDUSTRIAL. Includes manufacturing activities involving the mechanical or chemical transformations of materials or substances into other products. These activities occur in establishments usually described as plants, factories or mills and characteristically use power driven machines and material handling equipment.
(4) INSTITUTIONAL. Includes social, charitable, religious and educational activities such as schools, churches, hospitals, nursing homes, penal institutions and similar institutional users.
(5) RESIDENTIAL. Includes all dwelling units such as detached, semidetached and row houses, mobile homes, garden and standard apartments, permanent multi-family dwellings. (Transient lodging, considered commercial in nature, is not included.)
COMPATIBLE POLLUTANT.
(1) Biochemical oxygen demand, suspended solids, pH and fecal coliform bacteria, plus additional pollutants identified in the NPDES permit if the treatment works was designed to treat the pollutants, and in fact does remove the pollutants to a substantial degree.
(2) The term substantial degree is not subject to precise definition, but generally contemplates removals in the order of 80% or greater. Minor incidental removals in the order of 10 to 30% are not considered substantial.
(3) Examples of the additional pollutants which may be considered compatible include:
(a) Chemical oxygen demand;
(b) Total organic carbon;
(c) Phosphorus and phosphorus compounds;
(d) Nitrogen and nitrogen compounds; and
(e) Fats, oils and greases of animal or vegetable origin (except as prohibited where these materials would interfere with the operation of the treatment works).
DEPRECIATION. An annual operating cost reflecting capital consumption and obsolescence (reduction of future service potential) of the treatment works.
EASEMENT. An acquired legal right for the specific use of land owned by others.
FECAL COLIFORM. Any of a number of organisms common to the intestinal tract of humans and animals, whose presence in sanitary sewage is an indicator of pollution.
FLOATABLE OIL. Oil, fat or grease in a physical state, so that will separate by gravity from waste water by treatment in a pretreatment facility approved by the authority.
GARBAGE. Solid wastes from the domestic and commercial preparation, cooking and dispensing of food, and from the commercial handling, storage and sale of produce.
INCOMPATIBLE POLLUTANT. Any pollutant that is not defined as a compatible pollutant, including non-biodegradable dissolved solids.
INDUSTRIAL COST RECOVERY. Recovery from the industrial users of a treatment works of the grant amount allocable to treatment of wastes from the users pursuant to § 204(b) of PL 92-500, being 33 U.S.C. §§ 1284(b).
INFILTRATION. The water entering a sewer system, including building drains and sewers, from the ground, through means such as, but not limited to, defective pipes, pipe joints, connections or manhole walls. (INFILTRATION does not include and is distinguished from inflow.)
INFILTRATION/INFLOW. The water discharge into a sewer system, including building drains and sewers, from those sources such as, but not limited to, roof leaders, cellar, yard and area drains, foundation drains, unpolluted cooling water discharges, drains from springs and swampy areas, manhole covers, cross-connections from storm sewers and combined sewers, catch basins, storm waters, surface runoff, street wash waters or drainage. (INFLOW does not include, and is distinguished from, INFILTRATION.)
MAJOR CONTRIBUTING INDUSTRY. An industry that:
(1) Has a flow of 50,000 gallons or more per average work day;
(2) Has a flow greater than 5% of the flow carried by the municipal system receiving the waste;
(3) Has in its waste a toxic pollutant in toxic amounts as defined in standards issued under § 307(a) of PL 92-500, being 33 U.S.C. § 1317(a); or
(4) Has a significant impact, either singly or in combination with other contributing industries, on a treatment works or on the quality of effluent from that treatment works.
NATURAL OUTLET. Any outlet, including storm sewers and combined sewer overflows, into a watercourse, pond, ditch, lake or other body of surface or groundwater.
NORMAL DOMESTIC SEWAGE. As defined for the purposes of determining surcharge, shall mean waste water or sewage having an average daily suspended solids concentration of not more than 250 mg/l, and average daily BOD of not more than 200 mg/l (an average daily phosphorus concentration of 11 mg/l and containing not more than 2.5 mg/l of hexane soluble matter (grease and oil)).
NPDES PERMIT. A permit issued under the National Pollutant Discharge Elimination System for discharge of waste waters to the navigable waters of the United States pursuant to § 402 of PL 92-500, being 33 U.S.C. § 1342.
OPERATION AND MAINTENANCE COSTS. All costs, direct and indirect (other than debt service), necessary to ensure adequate waste water treatment on a continuing basis, conform with at related federal, state and local requirements, and assure optimal long-term facility management. (These costs include depreciation and replacement.)
PERSON. Any individual, firm, company, association, society, corporation or group discharging any waste water to WWTW.
pH. The reciprocal of the logarithm of the hydrogen ion concentration. The concentration is the weight of hydrogen ions in grams per liter of solution.
PRETREATMENT. The treatment of industrial sewage from privately owned industrial sources prior to introduction into a public treatment works.
PROPERLY SHREDDED GARBAGE. The wastes from the preparation, cooking and dispensing of food that has been 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 three-eighths inch in any dimension.
PRIVATE SEWER. A sewer which is not owned by a public authority.
PUBLIC AUTHORITY. Any governmental agency having jurisdiction by law over construction and use of a waste water collection or treatment facility.
PUBLIC SEWER. A sewer which is owned and controlled by the public authority and will consist of the following increments.
(1) COLLECTOR SEWER. A sewer whose primary purpose is to collect waste waters from individual point source discharges.
(2) FORCE MAIN. A pipe in which waste water is carried under pressure.
(3) INTERCEPTOR SEWER. A sewer whose primary purpose is to transport waste water from collector sewers to a treatment facility.
(4) PUMPING STATION. A station positioned in the public sewer service at which waste water is pumped to a higher level.
REPLACEMENT. Expenditures for obtaining and installing equipment, accessories or appurtenances which are necessary during the service life of the treatment works to maintain the capacity and performance for which the works were designed and constructed.
SANITARY SEWER. A sewer which carries sanitary and industrial wastes, and to which storm, surface and groundwater are not intentionally admitted.
SEWAGE. The combination of the liquid and water-carried wastes from residences, commercial buildings, industrial plants and institutions (including polluted cooling water). The two most common types of SEWAGE are as follows.
(1) SANITARY SEWAGE. The combination of liquid and water-carried wastes discharged from toilet and other sanitary plumbing facilities.
(2) INDUSTRIAL SEWAGE. A combination of liquid and water-carried wastes, discharged from any industrial establishment, and resulting from any trade or process carried on in that establishment. (This shall include the wastes from pretreatment facilities and polluted cooling water.)
SHALL. Is mandatory; MAY is permissive.
SIGNIFICANT INDUSTRY. Any industry that will contribute greater than 10% of the design flow or design pollutant loading of the treatment works.
SLUG. Any discharge of water or waste water 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 of flows during normal operation.
STANDARD METHODS. The laboratory procedures set forth in the latest edition, at the time of analysis, of Standard Methods for the Examination of Water and Waste Water prepared and published jointly by the American Public Health Association, the American Water Works Association and the Water Pollution Control Federation.
STORM SEWER. A sewer for conveying water, groundwater or unpolluted water from any source and to which sanitary and/or industrial wastes are not intentionally admitted.
SUSPENDED SOLIDS. Solids that either float on the surface of, or are in suspension in water, sewage or other liquids and which are removable by laboratory filtering.
TOTAL SOLIDS. The sum of suspended and dissolved solids.
TOXIC AMOUNT. Concentrations of any pollutant or combination of pollutants, which upon exposure to or assimilation into any organism will cause adverse effects, such as cancer, genetic mutations and physiological manifestations, as defined in standards issued pursuant to § 307(a) of PL 92-500, being 33 U.S.C. § 1317(a).
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 and would not be benefitted by discharge to the sanitary sewers and waste water treatment facilities provided.
USER CHARGE. A charge levied on users of a waste water treatment works for the cost of operation and maintenance of the works pursuant to § 204(b) of PL 92-500, being 33 U.S.C. § 1284(b).
VOLATILE ORGANIC MATTER. The material in the sewage solids transformed to gases or vapors when heated at 550°C for 15 to 20 minutes.
WASTE WATER TREATMENT WORKS. The structures, equipment and processes required to collect, transport and treat domestic and industrial wastes and dispose of the effluent and accumulated residual solids.
WATER WORKS. All facilities for water supply, filtration plant, storage reservoir, water lines and services, and booster stations for obtaining, treating and distributing potable water.
WATERCOURSE. A natural or artificial channel for the passage of water either continuously or intermittently.
(Ord. 88, passed 4-28-1981)