6-3-4: USE OF PUBLIC SEWERS:
   A.   Discharge Of Unpolluted Water: No person shall discharge or cause to be discharged any unpolluted waters such as storm water, ground water, roof runoff, subsurface drainage, or cooling water to any sanitary sewer.
Storm water and all other unpolluted drainage shall be discharged to such sewers as are specifically designated as storm sewers or to a natural outlet approved by the Town Engineer and other regulatory agencies. Unpolluted industrial cooling water or process waters may be discharged, on approval of the Town Engineer, to a storm sewer or natural outlet.
   B.   General Discharge Prohibitions: No user shall contribute or cause to be contributed, directly or indirectly, any pollutant or wastewater which will interfere with the operations or performance of the POTW. These general prohibitions or performance of the POTW whether or not the user is subject to National Categorical Pretreatment Standards or any other national, State, or local pretreatment standards or requirements. A user may not contribute the following substances to any POTW:
      1.   Any liquids, solids, or gases which by reason of their nature or quantity are, or may be, sufficient either along or by interaction with other substances to cause fire or explosion or be injurious in any other way to the POTW or to the operation of the POTW. At no time shall two (2) successive readings on an explosion hazard meter, at the point of discharge into the system (or at any point in the system), be more than five percent (5%) nor any single reading over ten percent (10%) of the lower explosive limit (LEL) of the meter. Prohibited materials include, but are not limited to: gasoline, kerosene, naphtha, benzene, toluene, xylene, ethers, alcohols, ketones, aldehydes, peroxides, chlorates, perchlorates, bromates, carbides, hydrides and sulfides, and any other substances which the city/Town, the State, or EPA has notified the user is a fire hazard or a hazard to the system.
      2.   Solid or viscous substances which may cause obstruction to the flow in a sewer or other interference with the operation of wastewater treatment facilities such as, but not limited to: grease, garbage with particles greater than one-half inch (1/2") in any dimension, animal guts or tissues, paunch manure, bones, hair, hides or fleshings, entrails, whole blood, feathers, ashes, cinders, sand, spent lime, stone, or marble dust, metal, glass, straw, shavings, grass clippings, rags, spent grains, spent hops, wastepaper, wood, plastics, tar, asphalt residues, residues from refining, or processing of fuel or lubricating oil, mud, or glass grinding or polishing wastes.
      3.   Petroleum based oil in sufficient enough amounts that cause pass-through or interference to the system, and in no cases, exceeding one hundred milligrams per liter (100 mg/l).
      4.   Any wastewater having a pH less than 5.0 or greater than 9.00, unless the POTW is specifically designed to accommodate such wastewater, or wastewater having any other corrosive property capable of causing damage or hazard to structures, equipment, and/or personnel of the POTW.
      5.   Any wastewater containing toxic pollutants in sufficient quantity, either singly or by interaction with other pollutants, to injure or interfere with any wastewater treatment process, constitute a hazard to humans or animals, result in toxic gases, vapors or fumes within the POTW in a quantity that may cause acute worker health and safety problems, create a toxic effect in the receiving waters of the POTW or to exceed the limitation set forth in a categorical standard. A toxic pollutant shall include, but not be limited to, any pollutant identified pursuant to section 307(a) of the Act.
      6.   Any noxious or malodorous liquids, gases, or solids which either singly or by interaction with other wastes are sufficient to create a public nuisance or hazard to life or are sufficient to prevent entry into the public sewers for maintenance and repair.
      7.   Any substance which may cause the POTW's effluent or any other product of the POTW such as residues, sludges, or scums, to be unsuitable for reclamation and reuse or to interfere with the reclamation process. In no case, shall a substance discharged to the POTW cause the POTW to be in noncompliance with sludge use or disposal criteria, guidelines or regulations developed under section 405 of the Act; any criteria, guidelines, or regulations affecting sludge use or disposal developed pursuant to the Solid Waste Disposal Act, the Clean Air Act, the Toxic Substances Control Act, or State criteria applicable to the sludge management method being used.
      8.   Any substance which will cause the POTW to violate its NPDES and/or State disposal system permit or the receiving water quality standards.
      9.   Any wastewater with objectionable color which cannot be removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions.
      10.   Any wastewater having a temperature which will inhibit biological activity in the POTW treatment plant resulting in interference, but in no case wastewater with a temperature above sixty five degrees Celsius (65°C) (150°F) or a temperature that causes the POTW influent to exceed forty degrees Celsius (40°C) (104°F), unless the POTW treatment plant is designed to accommodate such temperature.
      11.   Any pollutants, including oxygen demanding pollutants (BOD, etc.) released at a flow rate and/or pollutant concentration which a user knows or has reason to know will cause interference to the POTW. In no case shall a slug load have a flow rate or contain concentrations or quantities of pollutants that exceed limits set by the city.
      12.   Any wastewater containing any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the city in compliance with applicable State or Federal regulations.
      13.   Any wastewater which causes a hazard to human life or creates a public nuisance.
When the city/Town determines that a user is contributing to the POTW, any of the above enumerated substances in such amounts as to interfere with the operation of the POTW, the city/Town shall: a) advise the user of the impact of the contribution on the POTW; and b) develop effluent limitations for such user to correct the interference with the POTW provided, however, nothing contained herein shall be interpreted to prohibit the city/Town from taking immediate enforcement action against a user who is contributing in violation of this Chapter.
      14.   Any discharge of trucked or hauled nonhazardous liquid wastes is prohibited except at discharge points designated by the POTW. Designation points shall be pursuant to rules and regulations of the city.
      15.   Any wastewater that causes the influent to the POTW to exceed the maximum allowable industrial loadings specified in the specific pollutants limitation-local limits subsection 6-3-4C of this Section.
   C.   Specific Pollutant Limitations Designated - Local Limits:
      1.   Maximum total allowable industrial loading that can be accepted at the POTW for treatment in accordance with guidance established by Federal law will be adopted by each town by resolution to reference the values established by the city of Casper.
      2.   Any other specific pollutants identified by the city may also have specific effluent permit limitations set to restrict their discharge into the system.
      3.   The above maximum allowable industrial loadings in pounds per day will be distributed using criteria established in Casper's report on the development of local limits under the Pretreatment Program, June 1994, and EPA Guidance Manual on the Development and Implementation of Local Discharge Limitations Under the Pretreatment Program, December 1987 (as they now exist or as they are hereafter revised).
      4.   Best Available Technology (BAT) shall be used for pretreatment of any discharges to the POTW from the clean-up activities, of soil, aquifer, or ground water table associated with leading underground storage tanks of spills of any petroleum products. The BAT shall be capable of reducing the benzene concentration to less than 0.05 mg/l and the "total" benzene, ethyl benzene, toluene and xylene (BETX) to less than 0.750 mg/l. This is in accordance with guidance established in EPA's Model NPDES Permit for Discharges resulting from the Cleanup of Gasoline Released from Underground Storage Tanks, June 1989.
   D.   State Requirements To Apply: State requirements and limitations on discharges shall apply in any case where they are more stringent than Federal requirements and limitations or those in this Chapter.
   E.   Excessive Discharges: No user shall increase the use of process water or, in any way, attempt to dilute a discharge as a partial or complete substitute for adequate treatment to achieve compliance with the limitations contained in the categorical standard, or in any other pollutant-specific limitation developed for the industrial user.
   F.   Tenant Responsibility: Where an owner of property leases premises to any other person as a tenant under any rental or lease agreement, if either the owner or the tenant is an industrial user, either or both may be held responsible for compliance with the provisions of this Chapter.
   G.   Accidental Discharges: Each significant industrial user shall provide protection from accidental discharge of prohibited materials or other substances regulated by this Chapter. Facilities to prevent accidental discharge of prohibited materials shall be provided and maintained at the owner's or user's own cost and expense. Detailed plans showing facilities and operating procedures to provide this protection shall be submitted to the Town for review, and shall be approved by the Town before construction of the facility. No significant industrial user who commences contribution to the POTW after the effective date hereof shall be permitted to introduce pollutants into the system until accidental discharge procedures have been approved by the Town. Review and approval of such plans and operating procedures shall not relieve the significant industrial user's facility as necessary to meet the requirements of this Chapter. In the case of an accidental discharge, it is the responsibility of the significant industrial user to immediately telephone and notify the POTW of the incident. The notification shall include location of discharge, type of waste, concentration and volume, and corrective actions.
   H.   Notices:
      1.   Written Notice: Within five (5) days following an accidental discharge, the significant industrial user shall submit to the Town Engineer and city a detailed written report describing the cause of the discharge and the measures to be taken by the significant industrial user to prevent similar future occurrences. Such notification shall not relieve the significant industrial user of any expense, loss, damage, or other liability which may be incurred as a result of damage to the POTW, fish kills, or any other damage to persons or property; nor shall such notification relieve the significant industrial user of any fines, civil penalties, or other liability which may be imposed by this Chapter or other applicable law.
      2.   Notice To Employees: A notice shall be permanently posted on the user's bulletin board or other prominent place advertising employees whom to call in the event of an accidental discharge. Employers shall ensure that all employees who may cause or suffer such an accidental discharge to occur are advised of the emergency notification procedure.
   I.   Federal Categorical Pretreatment Standards: Upon the promulgation of the categorical standard for a particular industrial subcategory, the standard, if more stringent than limitations imposed under this Chapter for sources in that subcategory, shall immediately supersede the limitations imposed under this Chapter. The City shall notify all affected users of the applicable reporting requirements under 40 CFR, section 403.12, as enacted or hereafter amended. (Ord. 99-03, 11-16-1999)