(A) Prohibited discharges.
(1) 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 user may contribute the following substances to the system:
(a) The admission into the public sewers of any waters or wastes having:
1. A five-day biochemical oxygen demand greater than 300 milligrams per liter (mg/l) by weight; or
2. Containing more than 350 milligrams per liter (mg/l) by weight of suspended solids.
(b) 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 the prohibition are wastestreams with a closed cup flashpoint of less than 140°F (60°C) using the test methods prescribed in 40 C.F.R. § 261.21;
(c) 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;
(d) Any fats, oils or greases, including, but not limited to, petroleum oil, non-biodegradable cutting oil, or products of mineral oil origin, in amounts exceeding 100 milligrams per liter or that will cause interference or pass through;
(e) Any wastewater having a pH less than six or more than nine, or which may otherwise cause corrosive structural damage to the system, city personnel or equipment;
(f) 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 facility, any wastewater treatment or sludge process or constitute a hazard to humans or animals;
(g) 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. This includes dissolved hydrogen sulfide concentrations exceeding 0.1 milligrams per liter (mg/l);
(h) Any substances 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 § 405 of the Clean Water Act, being 33 U.S.C. § 1345, the Solid Waste Disposal Act, the Clean Air Act, the Toxic Substance Control Act or the state requirements applicable to the sludge use and disposal practices being used by the city;
(i) 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% from the seasonable established norm for aquatic life;
(j) Any wastewater having a temperature greater than 150°F (55°C), 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°F (40°C);
(k) Any wastewater containing any radioactive waste or isotopes except as specifically approved by the Manager in compliance with applicable state or federal regulations;
(l) 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;
(m) Any trucked or hauled pollutants, except at discharge points designated by the city in accordance with § 50.21;
(n) Storm water, 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 Manager. (NOTE: Certain of these waters may require an NPDES permit from DEQ if discharged to a storm sewer or natural outlet.);
(o) Any sludges, screenings or other residues from the pretreatment of industrial wastes;
(p) Any medical wastes, except as specifically authorized by the Manager in a wastewater permit;
(q) Any material containing ammonia, ammonia salts or other chelating agents, which will produce metallic complexes that interfere with the municipal treatment system;
(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; and
(t) Any wastes containing detergents, surface active agents or other substances which may cause excessive foaming in the municipal treatment system.
(2) Wastes prohibited by this section shall not be processed or stored in a manner that these wastes could be discharged to the municipal treatment system.
(B) Federal categorical pretreatment standards. Users subject to categorical pretreatment standards are required to comply with applicable standards as set out in 40 C.F.R. Ch. I, Subch. N, parts 405 through 471 and incorporated herein.
(C) State requirements. Users are required to comply with applicable state pretreatment standards and requirement set out in O.A.R. Ch. 340. These standards and requirements are incorporated herein.
(D) Specific pollutant limitations.
(1) No nonresidential user shall discharge wastewater containing restricted substances into the wastewater sewer in excess of limitations specified in its wastewater discharge permit or published by the Manager. The Manager may publish and revise, from time to time, standards for specific restricted substances.
(2) At his or her discretion, the Manager may impose mass limitations in addition to or in place of the concentration-based limitations referenced above.
(E) Rejection and the like.
(1) If any wastewater is discharged or is proposed to be discharged to the public sewers, which waters contain the substances or possess the characteristics enumerated above and which in the judgment of the Manager may have a deleterious effect upon the treatment works, processes, equipment or receiving waters, or which may otherwise create a hazard to life or constitute a public nuisance, the Manager may:
(a) Reject the wastes;
(b) Require pretreatment to an acceptable condition for discharge to the public sewers;
(c) Require control over the quantities and rates of discharge; and/or
(d) Require payment to cover the added cost of handling and treating the wastes not covered by existing sewer charges.
(2) If the Manager permits the pretreatment of equalization of waste flows, the design and installation of the plants and equipment shall be subject to the review and approval of the Manager and/or City Engineer, and subject to the requirements of all applicable codes, ordinances and laws.
(F) Maintenance. Where preliminary treatment or flow-equalizing facilities are provided for any wastewater, they shall be maintained continuously in satisfactory and effective operation by the owner at his or her expense.
(G) Grease, oil and sand interceptors. Grease, oil and sand interceptors shall be provided when, in the opinion of the Manager, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts, or any flammable wastes, sand or other harmful ingredients. However, the interceptors shall not be required for private residences. All interceptors shall be of a type and capacity approved by the Manager and/or City Engineer, and shall be located so as to be readily and easily accessible for cleaning and inspection.
(H) Sampling.
(1) All measurements, tests, and analyses of the characteristics of waters and wastes to which reference is made in this subchapter shall be determined in accordance with 40 C.F.R. part 136 or, if 40 C.F.R. part 136 does not contain sampling of analytical techniques for the pollutant in question, in accordance with procedures approved by the Environmental Protection Agency (EPA), DEQ and the city.
(2) Except as indicated below, wastewater samples collected for purposes of determining compliance with standards and requirements of this subchapter must be obtained using flow proportional composite collection techniques. In the event that flow proportional sampling is infeasible, the Manager may authorize the use of time proportional or grab sampling.
(3) Samples for fats, oil and grease (FOG), temperature, pH, cyanide, phenols, sulfides and volatile organic chemicals must be obtained using grab collection techniques.
(I) Agreements. No statement contained in this section shall be construed to prohibit an agreement between the city and any person whereby a discharge of unusual strength or character may be accepted by the city for treatment. An agreement may be made when, in the opinion of the Manager, special circumstances justify the agreement; provided that, no interference or pass through result from the discharge and no additional costs are incurred by the city without recompense by the person. Federal and state pretreatment standards and requirements shall not be waived by any special agreement of the parties.
(Ord. 157, passed 6-18-1998) Penalty, see § 50.99