(A) General discharge prohibitions.

(1) No person shall discharge or cause to be discharged any storm water, surface water, ground water, road runoff, subsurface drainage, uncontaminated cooling water or unpolluted industrial process waters to any sanitary sewer.

(2) Storm water and all other unpolluted drainage shall be discharged to the sewers as are specifically designated as combined sewers or storm sewers or to a natural outlet approved by the City Administration. Industrial cooling water or unpolluted process waters may be discharged, on approval of the city and applicable regulatory agencies to a storm sewer, combined sewer or natural outlet.

(3) No Industrial User (IU) shall discharge, cause or permit to be discharged, directly or indirectly, any pollutant or wastewater which will cause interference or pass through. These general and specific prohibitions apply to all IUs of the city's wastewater system whether or not the user is subject to categorical pretreatment standards or any other national, state or local pretreatment standards or requirements.

(B) Specific discharge prohibitions. No person shall discharge or cause to be discharged the following described substances, materials, waters or wastes into the system:

(1) Any liquids, solids or gases which by reason of their nature or quantity are, or may be sufficient either alone or by interaction to cause fire or explosion or be injurious in any other way to the facilities or operations of the city. This prohibition include waste streams with a closed cup flash point of less than 140°F or 6°C, using the test method specified in 40 CFR 261.21; or any waste stream which two consecutive readings on an explosive hazard meter, at the point discharge into the system (or at any point in the system), are more than 5% nor any single reading over 10% of the lower explosive limit (LEL) of the meter.

(2) The flammable or explosive substances including, but are not limited to, gasoline, kerosene, naphtha, benzene, hexane, toluene, xylene, ethers, alcohols, ketones, aldehyde peroxides, chlorates, perchlorates, bromates, carbides, hydrides and sulfides.

(3) Solids (greater than ½-inch in any dimension) or viscous substances (including but not limited to petroleum oil, non-biodegradable cutting oil or products of mineral oil origin which will or may cause obstruction to the flow in a sewer or other interference with the operation of the wastewater system including, but not limited to: animal and vegetable-based fats, wax, grease or oils, emulsified or not, in excess of 100 mg/l or containing substances which may solidify or become viscous at temperatures between 32°F and 150°F (0°C and 65°C).

(4) Any wastewater having a pH less than 5.5 or greater than 9.5 or having any other corrosive property capable of causing damage or hazard to structures, equipment, personnel of the city system, unless the city approves the waste in variance because special conditions in the system, but in no case shall the pH be less than 5.0.

(5) (a) Any wastewater containing pollutants or other wastes in sufficient quantity (flow concentration including, but not limited to BOD, COD, etc.), either singly or by interaction, to pass through or interfere with any wastewater treatment or solids handling and utilization process, or constitute a hazard to humans or animals, or to exceed any limitations adopted as categorical pretreatment standards.

(b) A toxic pollutant shall include, but not be limited to, any pollutant identified in the “Toxic Pollutant List” set forth in 40 CFR Part 122, Appendix D.

(c) All toxic pollutants shall be deemed to be prohibited or regulated substances for purposes of this sub-chapter.

(6) Any noxious or malodorous liquids, gases, solids or other wastewater which either singly or by interaction are capable of creating a public nuisance or hazard to life or are sufficient to prevent entry into the sewers for their maintenance and repair. No discharge shall result in toxic gases, vapors or fumes within the collection or treatment system in a quantity that may cause worker health and safety problems.

(7) Any substance which may cause the system's effluent or treatment residues, sludges, or scums, to be unsuitable for reclamation and reuse or to interfere with the reclamation process or any substance which may cause the system 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 standards applicable to the solids management methods being used.

(8) Any sludges, screenings or other residues from the pretreatment of industrial wastes.

(9) Any substance discharged in such a strength as to potentially cause the city system to violate its NPDES and/or other disposal system permits.

(10) Any trucked or hauled pollutants, except at discharge points designated by the city.

(11) Any substances identified as hazardous waste according to 40 CFR Part 261, except specifically authorized by the city.

(12) Any wastewater having a temperature which will inhibit biological activity in any city treatment plant resulting in interference; but in no case, wastewater with a temperature at the introduction into the POTW (measured at the nearest downstream manhole) which exceeds 104°F or 40°C.

(13) Any slugload.

(14) Any unpolluted water including, but not limited to, non-contact cooling water, rainwater, groundwater, surface drainage, roof drainage, water from yard fountains, ponds or pool (except filter backwash water from swimming pools and to reject water) unless prior written approval has been obtained from the city.

(15) Any wastewater containing any radioactive wastes or isotopes (except those included in “Oregon Regulations for the Control of Radiation,” OAR 333-22-150, of the half-life or concentration as to exceed limits established by the city or any applicable state or federal regulations.

(16) 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 NPDES permit.

(17) Materials which exert or cause:

(a) Unusual concentrations of inert suspended solids (such as but not limited to fullers, earth, lime substrate and lime residues) or of dissolved solids (such as but not limited to sodium chloride and sodium sulfate);

(b) Excessive discoloration (such as but not limited to dye wastes and vegetable tanning solutions);

(c) Unusual BOD, chemical oxygen demand (COD) or chlorine requirements in the quantities as to constitute a significant load on the sewage treatment works; and/or

(d) Unusual volume of flow or concentrations of wastes constituting “slugs” as defined herein.

(18) Waters or wastes containing substances which are not amenable to treatment or reduction by sewage treatment processes employed or are amenable to treatment only to the degree that the sewage treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.

(19) Wastes prohibited by this section shall not be processed or stored in a manner so that these wastes could be discharged to the municipal wastewater system.

(C) Dilution. No user shall increase the use of potable or process water in any way, for the purpose of diluting a discharge as a partial or complete substitute for adequate treatment to achieve compliance with the standards set forth in this sub-chapter or its discharge permit or in lieu of proper disposal of any material as solid waste. The city may impose mass limitations on dischargers that in its judgment appear to be using dilution to meet applicable pretreatment standards or requirements of this section, or in cases where the imposition of mass limitations is otherwise deemed appropriate by the city.

(D) More stringent limitations. The city retains the right to amend this sub-chapter to provide for more stringent limitations or requirements on discharges to the city system when deemed necessary.

(E) Categorical pretreatment standards. IU's subject to categorical pretreatment standards are required to comply with applicable standards set out in 40 CFR Chapter 1, Sub-chapter N, Parts 405-471.

(F) State requirements. Users are required to comply with applicable state pretreatment standards and requirements set out in OAR Chapter 340. These standards and requirements are incorporated herein.

(G) Specific pollutant limitations and local limitations. In addition to categorical pretreatment standards referenced in other portions of this sub-chapter, no SIU shall discharge wastewater containing pollutants into the system in excess of limitations specified in its wastewater discharge permit or other limits established by the city. The city may establish and revise from time to time standards for specific restricted substances. These standards shall be developed in accordance with 40 CFR Section 403.5 and shall implement the objectives of this subchapter. Standards established in accordance with this section will be deemed pretreatment standards for the purposes of Section 307(d) of the Act. Wherever a discharger is subject to both categorical pretreatment standards and a local limit for a give pollutant, the more stringent shall apply.

(H) Mass limitations. The city may issue mass limitations for dischargers in addition to or in place of concentration-based limitations.

I) Grease interceptor. A grease interceptor shall be installed on all building sewers for all commercial and multiple dwelling unit users. Any conversion to commercial or multiple dwelling use may be required to install a grease interceptor. The requirement for a grease interceptor may be waived by the city administration when a written request is filed indicating all of the following:

(1) The waste stream from the commercial establishment meets the terms of domestic waste defined in this sub-chapter; and

(2) No kitchen facilities for public service or service to more than ten residents or dwelling units as defined herein.

(J) Oil and sand interceptors. Oil and sand interceptors shall be required when they are necessary for the proper handling of liquid wastes containing grease in excessive amounts or any flammable wastes, sand or other harmful ingredients; except that the interceptors shall not be required for private living quarters or dwelling units. All interceptors shall be of a type and capacity approved by the city administration and shall be located as to be ready and easily accessible for cleaning and inspection. The city administration shall be the final determination of the requirements.

(Ord. 1941, passed 11-24-97) Penalty, see §51.999