13.12.090 General sewer user requirements.
(1) Prohibited Discharge Standards. No user shall contribute, or cause to be contributed, directly or indirectly, any pollutant or wastewater which will cause interference or pass through. These general prohibitions apply to all users of the municipal wastewater system whether or not the user is subject to categorical pretreatment standards or any other national, state or local pretreatment standards or requirements. Furthermore, no use may contribute the following substances to the system:
(a) Any liquids, solids, or gases which by reason of their nature or quantity are, or may be, sufficient, either alone or by interaction with other substances, to cause fire or explosion, or be injurious in any other way to the municipal wastewater system. Included in this prohibition are waste-streams with a closed cup flashpoint of less than 140 degrees Fahrenheit (60 degrees centigrade) using the test methods prescribed in 40 CFR 261.21.
(b) Solid or viscous substances in amounts which will cause interference with the flow in a
sewer but in no case solids greater than one-half inch (1.27 centimeters) in any dimension.
(c) Any fat, oils or greases, including but not limited to petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin in amounts that will cause interference or pass through.
(d) Any wastewater having a pH less than 5.5 or more than 10.0, or which may otherwise cause corrosive structural damage to the system, city personnel or equipment.
(e) Any wastewater containing pollutants in sufficient quantity (flow or concentration), either singly or by interaction with other pollutants, to pass through or interfere with the municipal wastewater system, any wastewater treatment or sludge process, or constitute a hazard to humans or animals.
(f) Any noxious or malodorous liquids, gases or solids or other wastewater 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 sewers for maintenance and repair.
(g) Any substance which may cause the treatment plant effluent or any other 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 system cause the city to be in noncompliance with sludge use or disposal regulations or permits issued under Section 405 of the Act, the Solid Waste Disposal Act, the Clean Air Act, the Toxic Substances Control Act, or other state requirements applicable to the sludge use and disposal practices being used by the city.
(h) Any wastewater which imparts color which cannot be removed by the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions, which consequently imparts color to the treatment plants effluent thereby violating the city’s NPDES permit. Color (in combination with turbidity) shall not cause the treatment plant effluent to reduce the depth of the compensation point for photosynthetic activity by more than 10 percent from the seasonably established norm for aquatic life.
(i) Any wastewater having a temperature greater than 150 degrees Fahrenheit (55 degrees centigrade), or which will inhibit biological activity in the treatment plant resulting in interference, but in no case wastewater which causes the temperature at the introduction into the treatment plant to exceed 104 degrees Fahrenheit (40 degrees centigrade).
(j) Any wastewater containing any radioactive waste or isotopes except as specifically approved by the superintendent in compliance with applicable state or federal regulations.
(k) Any pollutants which result in the presence of toxic gases, vapor or fumes within the system in a quantity that may cause worker health and safety problems.
(l) Any trucked or hauled pollutants, except at discharge points designated by the city in accordance with NBCC 13.12.100(6), Hauled Wastewater.
(m) Stormwater, surface water, ground water, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, deionized water, cooling water and unpolluted industrial wastewater, unless specifically authorized by the superintendent.
(n) Any sludges, screenings, or other residues from the pretreatment of industrial wastes.
(o) Any medical wastes except as specifically authorized by the superintendent in a wastewater permit.
(p) Any material containing ammonia, ammonia salts, or other chelating agents which will produce metallic complexes that interfere with the municipal wastewater system.
(q) Any material identified as hazardous waste according to 40 CFR Part 261 except as specifically authorized by the superintendent.
(r) Any wastewater causing the treatment plant effluent to demonstrate toxicity to test species during a biomonitoring evaluation.
(s) Recognizable portions of the human or animal anatomy.
(t) Any wastes containing detergents, surface active agents, or other substances which may cause excessive foaming in the municipal wastewater system.
(i) Wastes prohibited by this section shall not be processed or stored in such a manner that these wastes could be discharged to the municipal wastewater system.
(2) Federal Categorical Pretreatment Standards. Users subject to categorical pretreatment standards are required to comply with applicable standards as set out in 40 CFR Chapter 1, Subchapter N, Parts 405 – 471, and incorporated herein.
(3) State Requirements. Users are required to comply with applicable state pretreatment standards and requirements set out in Chapter 340 OAR. These standards and requirements are incorporated herein.
(4) Specific Pollutant Limitations. No nonresidential user shall discharge wastewater containing restricted substances into the municipal wastewater system in excess of limitations specified in its wastewater discharge permit or published by the superintendent. The superintendent shall publish and revise from time to time standards for specific restricted substances. These standards shall be developed in accordance with 40 CFR 403.5 and shall implement the objectives of this chapter. Standards published in accordance with this section will be deemed pretreatment standards for the purposes of Section 307(d) of the Act.
(a) At his discretion, the superintendent may impose mass limitations in addition to or in place of the concentration based limitations referenced above.
(5) City’s Right to Revision. The city reserves the right to establish, by ordinance or in wastewater permit, more stringent limitations or requirements or discharges to the municipal wastewater system if deemed necessary to comply with the objectives presented in subsection (1) of this section, Prohibited Discharge Standards.
(6) Special Agreement. The city reserves the right to enter into special agreements with users setting out special terms under which the industrial user may discharge to the system. In no case will a special agreement waive compliance with a pretreatment standard. However, the industrial user may request a net gross adjustment to a categorical standard in accordance with 40 CFR 403.15. Industrial users may also request a variance from the categorical pretreatment standard from U.S. EPA. Such a request will be approved only if the user can prove that factors relating to its discharge are fundamentally different from the factors considered by U.S. EPA when establishing that pretreatment standard. An industrial user requesting a fundamentally different factor variance must comply with the procedural and substantive provisions in 40 CFR 403.13.
(7) Dilution. No user shall ever 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 a discharge limitation unless expressly authorized by an applicable pretreatment standard, or any other pollutant-specific limitation developed by the city. (Ord. 1770 § 2, 1991; Ord. 1104 § 8(A), 1958)