A.   Purpose: The purposes of this Chapter are:
      1.   To establish uniform requirements for direct and indirect contributors into the wastewater collection and treatment system owned and operated by the city/Town and to enable the city/Town to comply with applicable State and Federal laws and the general pretreatment regulations;
      2.   To prevent the introduction of pollutants into the POTW, which will:
         a.   Interfere with the operation of the system,
         b.   Cause the treatment plant to violate its NPDES discharge permit,
         c.   Contaminate the sludge,
         d.   Pass through the system, inadequately treated, into receiving waters or the atmosphere,
         e.   Pose a health threat to sewer workers, or
         f.   Be otherwise incompatible with the system.
      3.   Improve the opportunity to recycle and reclaim wastewaters and sludge from the system; and
      4.   Provide for equitable distribution of the cost of the Municipal wastewater system; and
      5.   Provide for proper handling and monitoring of liquid wastes containing floatable materials such as oil and grease and heavy inorganic material (such as sand and grit) which cannot be allowed to enter the POTW.
   B.   Abbreviations: The following abbreviations shall have the designated meanings:
biochemical oxygen demand
Code of Federal Regulations
chemical oxygen demand
Environmental Protection Agency
industrial user
milligrams per liter
National Pollutant Discharge Elimination System
publicly owned treatment works
Standard Industrial Classifications
Solid Waste Disposal Act, 42 USC 6901 et seq.
United States Code
total suspended solids
   C.   Definitions: For the purposes of this Chapter, the following words and phrases shall have the meanings respectively ascribed to them by this Section:
    ACT OR "THE ACT": The Federal Water Pollution Control Act, also known as the Clean Water Act, as amended, 33 USC 1251 et seq.
   AGREEMENT: Agreement For Intergovernmental Cooperation Concerning Industrial Wastewater Pretreatment. The "Agreement" provides a mechanism for handling the industrial pretreatment program enforcement and establishes the working relationship with the various towns, districts, the County and the city of Casper. The agreement provides for the city of Casper to act with, or on behalf of the various entities in implementing the requirements of the industrial wastewater pretreatment program.
   APPROVAL AUTHORITY: The Administrator of the United States Environmental Protection Agency or his designate.
   AUTHORIZED REPRESENTATIVE OF INDUSTRIAL USER: An authorized representative of an industrial user may be: 1) a principal executive officer of at least the level of vice president, if the industrial user is a corporation; 2) a general partner or proprietor if the industrial user is a partnership or proprietorship; 3) a duly authorized representative of the individual designated above if such representative is responsible for the overall operation of the facilities from which the indirect discharge originates.
   BIOCHEMICAL OXYGEN DEMAND (BOD): The quantity of oxygen utilized in the biochemical oxidation of organic matter under standard laboratory procedure in five (5) days at twenty degrees centigrade (20°C) expressed in milligrams per liter.
   BOILER BLOWDOWN WASTEWATER: The discharge of water with high concentrations of accumulated solids from boilers to prevent plugging of the boiler tubes and/or steam lines. In cooling towers, blowdown is discharged to reduce the concentration of dissolved salts in the recirculating cooling water. Clean "make- up" water is added to dilute the dissolved solids in the system. Blowdown also includes the discharge of condensate.
   BUILDING DRAIN: That 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 the building, and conveys it to the building sewer, being five feet (5') (1.5 m) outside the inner face of the building wall.
   BUILDING SEWER: The extension from the building drain to the public sewer or other place of disposal, also called house connection.
   BYPASS: The intentional diversion of waste streams from any portion of an industrial user's pretreatment facility.
   CATEGORICAL STANDARDS: National categorical pretreatment standards or pretreatment standard.
   CITY: The governing body of the city of Casper, Wyoming, the Casper city manager or his duly appointed representative acting in conjunction with or on behalf of the entity as per the agreement for intergovernmental cooperation concerning industrial wastewater pretreatment.
   CITY MANAGER: The Casper city manager or his duly appointed representative.
   COMBINED SEWER: A sewer intended to receive both wastewater and storm or surface water.
   COMPOSITE SAMPLE: A sample that is collected over time, formed either by continuous sampling or by mixing discrete samples. The sample may be composited either as a time-composite; composed of discrete sample aliquots collected in one container at constant time intervals providing representative samples irrespective of effluent; or as a flow-proportional composite sample, collected either as a constant sample volume at time intervals proportional to effluent, or collected by increasing the volume of each aliquot as the flow increases while maintaining a constant time interval between the aliquots. At a minimum, four (4) grab samples shall be collected every two (2) hours during normal operation.
   COOLING WATER: The water discharged from any use such as air conditioning, cooling or refrigeration, or to which the only pollutant added is heat.
   COUNTY: The governing body of Natrona County.
   DIRECT DISCHARGE: The discharge of treated or untreated wastewater directly to the waters of the State of Wyoming.
   DISTRICT: The governing body of a water and sewer district or an improvement and service district set up under Wyoming State statutes.
   DOMESTIC WASTEWATER: Describes the liquid and water-carried wastes from residences, and the nonregulated liquid and water- carried wastes from commercial buildings, industrial plants and institutions. All other wastewaters are considered nondomestic or industrial wastes.
   EASEMENT: An acquired legal right for the specific use of land owned by others.
   ENVIRONMENTAL PROTECTION AGENCY OR EPA: The U.S. Environmental Protection Agency, or where appropriate the term may also be used as a designation for the administrator or other duly authorized official of said Agency.
   FLOATABLE OIL: Oil, fat or grease in a physical state such that it will separate from wastewater by treatment in an approved pretreatment facility. Wastewater shall be considered free of floatable fat if it is properly pretreated and the wastewater does not interfere with the collection system.
   GARBAGE: The animal and vegetable waste resulting from the handling, preparation, cooking and serving of foods.
   GRAB SAMPLE: A sample which is taken from a waste stream on a one-time basis with no regard to the flow in the waste stream and without consideration of time.
   HOLDING TANK WASTE: Any waste from holding tanks such as vessels, chemical toilets, campers, trailers, septic tanks and vacuum-pump tank trucks.
   INDIRECT DISCHARGE: The discharge or the introduction of nondomestic pollutants from any source regulated under section 307(b) or (c) of the Act (33 USC 1317), into the POTW (including holding tank waste discharged into the system).
   INDUSTRIAL USER: Any person who introduces pollutants into a POTW from any nondomestic source regulated under the Act, State law, or local ordinance.
   INDUSTRIAL WASTES: The wastewater from industrial processes, trade or business as distinct from domestic or sanitary wastes.
   INTERFERENCE: The inhibition or disruption of the POTW treatment processes or operations which contributes to a violation of any requirement of the city's NPDES permit. The term includes prevention of sewage sludge use or disposal by the POTW in accordance with 405 of the Act (33 USC 1345) or any criteria, guidelines, or regulations developed pursuant to the Solid Waste Disposal Act (SWDA), the Clean Air Act, the Toxic Substances Control Act, or more stringent State criteria (including those contained in any State sludge management plan prepared pursuant to title IV of SWDA) applicable to the method of disposal or use employed by the POTW.
   NATIONAL CATEGORICAL PRETREATMENT STANDARD OR PRETREATMENT STANDARD: Any regulation containing pollutant discharge limits promulgated by the EPA in accordance with section 307(b) and (c) of the Act (33 USC 1347) which applies to a specific category of industrial users.
   NATIONAL POLLUTION DISCHARGE ELIMINATION SYSTEM OR NPDES PERMIT: A permit issued pursuant to section 402 of the Act (33 USC 1342).
   NATIONAL PRETREATMENT STANDARD, PRETREATMENT STANDARD, OR STANDARD: "National Pretreatment Standard" means any regulation containing pollutant discharge limits promulgated by the EPA in accordance with section 307(b) and (c) of the Act (33 USC 1317), which applies to industrial users. This term includes prohibitive discharge limits established pursuant to 40 CFR part 403.5, or any revision thereto.
   NATIONAL PROHIBITIVE DISCHARGE STANDARD OR PROHIBITIVE DISCHARGE STANDARD: Any regulation developed under the authority of 307(b) of the Act and 40 CFR section 403.5.
   NATURAL OUTLET: Any outlet, including storm sewers and combined sewer overflows, into a watercourse, pond, ditch, lake or other body of surface or ground water.
   1. Any building, structure, facility or installation from which there is or may be a discharge of pollutants, the construction of which commenced after the publication of proposed pretreatment standards under section 307(c) of the Act which will be applicable to such source if such standards are thereafter promulgated in accordance with that section, provided that:
      a. The building, structure, facility or installation is constructed at a site at which no other source is located; or
      b. The building, structure, facility or installation totally replaces the process or production equipment that causes the discharge of pollutants at an existing source; or
      c. The production or wastewater generating processes of the building, structure, facility or installation are substantially independent of an existing source at the same site. In determining whether these are substantially independent, factors such as the extent to which the new facility is integrated with the existing plant, and the extent to which the new facility is engaged in the same general type of activity as the existing source should be considered.
   2.   Construction on a site at which an existing source is located results in a modification rather than a new source if the construction does not create a new building, structure, facility or installation meeting the criteria of subsections 1b and 1c of this definition but otherwise alters, replaces, or adds to existing process or production equipment.
      3.   Construction of a "new source" as defined under this definition has commenced if the owner or operator has:
         a. Begun, or caused to begin as part of a continuous on-site construction program;
            (1) Any placement, assembly, or installation of facilities or equipment; or
            (2) Significant site preparation work including clearing, excavation, or removal of existing buildings, structures, or facilities which is necessary for the placement, assembly, or installation of new source facilities or equipment; or
         b. Entered into a binding contractual obligation for the purchase of facilities or equipment which are intended to be used in its operation within a reasonable time. Options to purchase or contracts which can be terminated or modified without substantial loss, and contracts for feasibility, engineering, and design studies do not constitute a contractual obligation under this definition.
   NONCONTACT COOLING WATER: Water used for cooling which does not come into direct contact with any raw material, intermediate product, waste product, or finished product.
   NONSIGNIFICANT INDUSTRIAL USER: Shall refer to all other industrial users of the POTW not currently classified as significant industrial users as defined in this subsection.
   POTW TREATMENT PLANT: That portion of the POTW designed to provide treatment to wastewater.
   PASS-THROUGH: A discharge which exits the POTW into waters of the State in quantities or concentrations which, alone or in conjunction with a discharge or discharges from other sources, causes a violation of any requirement of the POTW's NPDES permit (including an increase in the magnitude or duration of a violation).
   PERSON: Any individual, partnership, copartnership, firm, company, corporation, association, joint stock company, trust, estate, governmental entity or any other legal entity, or their legal representatives, agents or assigns. The masculine gender shall include the feminine, and the singular shall include the plural where indicated by the context.
   pH: The logarithm (base 10) of the reciprocal of the concentration of hydrogen ions expressed in grams per liter of solution.
   POLLUTANT: Any dredged spoil, solid waste, incinerator residue, sewage, garbage, sewage sludge, munitions, chemical wastes, biological materials, radioactive materials, heat, wrecked or discarded equipment, rock, sand, cellar dirt and industrial, municipal and agricultural waste discharged into water.
   POLLUTION: The manmade or man-induced alteration of the chemical, physical, biological and radiological integrity of water.
   PRETREATMENT OR TREATMENT: The reduction of the amount of pollutants, the elimination of pollutants, or the alteration of the nature of pollutant properties in wastewater to a less harmful state prior to or in lieu of discharging or otherwise introducing such pollutants into a POTW. The reduction or alteration can be obtained by physical, chemical or biological processes, or process changes by other means, except as prohibited by 40 CFR section 403.6(d).
   PRETREATMENT PROGRAM: The document developed in accordance with EPA guidance to demonstrate how the general pretreatment regulations of 40 CFR part 403 will be implemented. The document is used to support and complement the directives of this division wastewater.
   PRETREATMENT REQUIREMENTS: Any substantial or procedural requirement related to pretreatment, other than a national pretreatment standard imposed on an industrial user.
   PROCESS WASTEWATER: Any water which, during manufacturing or processing, comes into direct contact with or results from the production of or use of any raw material, intermediate product, finished product, byproduct, or waste product.
   PROPERLY SHREDDED GARBAGE: 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 (1/2") (1.27 cm) in any dimension.
   PUBLIC SEWER: A common sewer controlled by a governmental agency or public utility.
   PUBLICLY OWNED TREATMENT WORKS (POTW): A wastewater treatment works owned by the Town or other governmental agency or public utility. This definition includes any sewers that convey wastewater to the POTW treatment plant, but does not include pipes, sewers, or other conveyances not connected to a facility providing treatment. For the purposes of this Chapter, "POTW" shall also include any sewers that convey wastewaters to the POTW from other governmental agencies or persons outside the city who are, by contract or agreement with the city, users of the city's POTW.
   REGIONAL WASTEWATER SYSTEM BOUNDARY: The area designated by the city/Town entities and approved by EPA as being served currently or in the future by public sewer.
   SANITARY SEWER: A sewer that carries liquid and water-carried wastes from residences, commercial buildings, industrial plants and institutions, together with minor quantities of ground, storm and surface waters that are not admitted intentionally.
   SEVERE PROPERTY DAMAGE: Substantial physical damage to property, or damage to the treatment facilities which causes them to become inoperable, or substantial and permanent loss of natural resources which can reasonably be expected to occur in the absence of a bypass. Severe property damage does not mean economic loss caused by delays in production.
   SEWAGE: The spent water of a community. The preferred term is "wastewater".
   SEWER: A pipe or conduit that carries wastewater or drainage water.
   SHALL/MAY: Shall is mandatory, may is permissive.
   SIGNIFICANT INDUSTRIAL USER: 1. Except as provided in subsection 2 of this definition, the term "significant industrial user" means any user of the POTW who:
   a. Is subject to national categorical pretreatment standards;
   b. Has a discharge flow of twenty five thousand (25,000) gallons or more per average workday of process wastewater to the POTW (excluding sanitary, noncontact cooling and boiler blowdown wastewater);
   c. Contributes a process waste stream which makes up five percent (5%) or more of the average dry weather hydraulic or organic capacity of the POTW treatment plant;
   d. Has in its wastes toxic pollutants as defined pursuant to section 307 of the Act, or State statutes and rules; or
   e. Is found by the, city/Town, Wyoming Department of Environmental Quality, or the U.S. Environmental Protection Agency (EPA) to have significant impact, either singly or in combination with other contributing industries, on the wastewater treatment system, the quality of sludge, the system's effluent quality, or air emissions generated by the system.
      2.   Upon a finding that an industrial user meeting the criteria in subsection 1 of this definition has no reasonable potential for adversely affecting the POTW's operation or for violating any pretreatment standard or requirement, the utility manager may at any time, on his own initiative or in response to a petition received from an industrial user, and in accordance with subsection entitled wastewater discharge conditions, Article I, required when, paragraph g, determine that such industrial user is not a significant industrial user.
   SIGNIFICANT NONCOMPLIANCE: A violation(s) which:
      1.   Occurs in sixty six percent (66%) or more of the samples taken over a six (6) month period (any magnitude);
      2.   Exceeds the technical review criteria (TRC) for the same discharge limit in thirty three percent (33%) or more of the samples taken over a six (6) month period; TRC - 1.4 (40 percent exceedance) for BOD, TSS, fats, oils, and grease; TRC - 1.2 (20 percent exceedance) for all other pollutants;
      3.   Causes, alone or in combination with other discharges, interference or pass-through, including endangering POTW personnel or the public;
      4.   Endangers human health or the environment, or results in the POTW's exercise of its emergency power;
      5.   A delay in meeting a compliance schedule milestone (failure to begin or complete construction, or attain final compliance) by ninety (90) days or more;
      6.   Failure to submit any required report within thirty (30) days of the due date;
      7.   Failure to report noncompliance; or
      8.   Any other violation(s) which the POTW considers significant.
   SLUG: Any discharge of water or wastewater which in concentration of any given constituent, or in quantity of flow, which will cause interference with or pass through the system or exceeds a time limit for the discharge as set by the city.
   STANDARD INDUSTRIAL CLASSIFICATION (SIC): A classification pursuant to the Standard Industrial Classification Manual issued by the executive office of the President, Office of Management and Budget, 1972.
   STATE: State of Wyoming.
   STORM DRAIN (STORM SEWER): A drain or sewer for conveying water, ground water, subsurface water, or unpolluted water from any source.
   STORM WATER: Any flow of water occurring during or following any form of natural precipitation and resulting therefrom.
   SUPERINTENDENT: The Mayor or Town Engineer, or his duly appointed representative.
   SUSPENDED SOLIDS: The total suspended matter that floats on the surface of, or is suspended in, water, wastewater or other liquids, and which is removable by laboratory filtering and expressed in mg/l.
   TOWN: The Town of Bar Nunn, Wyoming, the Mayor, or his duly appointed representative.
   TOXIC POLLUTANT: Any pollutant or combination of pollutants listed as toxic in regulations promulgated by the administrator of the Environmental Protection Agency under the provisions of CWA 307(a) or other acts.
   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 benefited by discharge to the sanitary sewers and wastewater treatment facilities provided.
   USER: Any person who contributes, causes, or permits the contribution of wastewater into the Town's POTW.
   WASTEWATER: The liquid and water-carried industrial or domestic wastes from dwellings, commercial buildings, industrial facilities, and institutions, together with what may be present, whether treated or untreated, which is contributed into or permitted to enter the POTW.
   WASTEWATER CONTRIBUTION PERMIT: An authorization to permit a significant user to discharge wastewater into the POTW system.
   WATERCOURSE: A natural or artificial channel for the passage of water, either continuously or intermittently.
   WATERS OF THE STATE: All streams, lakes, ponds, marshes, watercourses, waterways, wells, springs, reservoirs, aquifers, irrigation systems, drainage systems and all other bodies or accumulations of water, surface or underground, natural or artificial, public or private, which are contained within, flow through or border upon the State or any portion thereof. (Ord. 99-03, 11-16-1999)