(A) Prohibited discharge standards.
(1) General prohibitions. No user shall introduce or cause to be introduced into the POTW any pollutant or wastewater which causes pass through or interference. These general prohibitions apply to all users of the POTW, whether or not they are subject to categorical pretreatment standards or any other national, state, or local pretreatment standards or requirements.
(2) Specific prohibitions. No user shall introduce or cause to be introduced into the POTW the following pollutants, substances, or wastewater:
(a) Pollutants which create a fire or explosive hazard in the POTW, including, but not limited to, wastestreams with a closed-cup flashpoint of less than 140°F (60°C) using the test methods specified in 40 CFR 261.21;
(b) Wastewater having corrosive properties capable of causing damage or injury to structures, equipment and/or personnel of the POTW, as per the specific prohibition in the applicable local limits in § 51.011(D). In no case shall wastewater containing a pH less than 5.5 (TRA-CRWS) and less than 6.0 (TRA-MCRWS) be discharged, unless the works is specifically designated to accommodate such discharges;
(c) Solid or viscous substances in amounts which will cause obstruction of the flow in the POTW, resulting in interference, blockage, or damage to the POTW;
(d) Pollutants, including oxygen-demanding pollutants (BOD, etc.), released in a discharge at a flow rate and/or pollutant concentration which, either singly or by interaction with other pollutants, will cause interference with the POTW;
(e) Wastewater having a temperature greater than 150°F (65°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);
(f) Petroleum oil, non-biodegradable cutting oil, or products of mineral oil origin, in amounts that will cause interference or pass through;
(g) Pollutants which result in the presence of toxic gases, vapors, or fumes within the POTW in a quantity that may cause acute worker health and safety problems;
(h) Trucked or hauled pollutants, except at discharge points designated by the Pretreatment Coordinator and the Control Authority in accordance with § 51.012(D);
(i) Noxious or malodorous liquids, gases, solids, or other wastewater which, either singly or by interaction with other wastes, are sufficient to create a public nuisance or a hazard to life, or to prevent entry into the sewers for maintenance or repair;
(j) 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 plant’s effluent, thereby violating the applicable NPDES permit;
(k) Wastewater containing any radioactive wastes or isotopes except in compliance with applicable state or federal regulations;
(l) Storm water, surface water, ground water, artesian well water, roof runoff, subsurface drainage, and unpolluted wastewater, unless specifically authorized by the Pretreatment Coordinator and the Control Authority;
(m) Sludges, screenings, or other residues from the pretreatment of industrial wastes;
(n) Medical wastes, except as specifically authorized by the Pretreatment Coordinator and/or the Control Authority in a wastewater discharge permit;
(o) Wastewater causing, alone or in conjunction with other sources, the treatment plant’s effluent to fail toxicity test;
(p) Detergents, surface-active agents, or other substances which may cause excessive foaming in the POTW;
(q) Fats, oils, or greases of animal or vegetable origin in concentrations greater than that specified in the applicable local limits in § 51.011(D);
(r) A discharge of water, normal domestic wastewater, or industrial waste that in quantity of flow exceeds, for a duration of longer than 15 minutes, more than four times the average 24-hour flow during normal operations of the industry;
(s) Insecticides and herbicides in concentrations that are not amenable to treatment;
(t) Polychlorinated biphenyls;
(u) Garbage that is not properly shredded to such an extent that all particles will be carried freely under the flow conditions normally prevailing in wastewater mains, with no particle having greater than one-half inch cross-sectional dimension;
(v) Wastewater or industrial waste generated or produced outside the city, unless approval in writing from the Pretreatment Coordinator and the Control Authority has been given to the person discharging the waste; or
(w) Without the approval of the Pretreatment Coordinator and the Control Authority, a substance or pollutant other than industrial waste, normal domestic wastewater, septic tank waste or chemical toilet waste that is of a toxic or hazardous nature, regardless of whether or not it is amenable to treatment, including, but not limited to, bulk or packaged chemical products.
(3) Pollutants, substances, or wastewater prohibited by this section shall not be processed or stored in such a manner that they could be discharged to the POTW.
(B) National Categorical Pretreatment Standards. The categorical pretreatment standards found at 40 CFR Chapter I, Subchapter N, Parts 405-471 are hereby incorporated.
(1) Where a categorical pretreatment standard is expressed only in terms of either the mass or the concentration of a pollutant in wastewater, the Pretreatment Coordinator may impose equivalent concentration or mass limits in accordance with 40 CFR 403.6(c).
(2) When wastewater subject to a categorical pretreatment standard is mixed with wastewater not regulated by the same standard, the Pretreatment Coordinator shall impose an alternate limit using the combined wastestream formula in 40 CFR 403.6(e).
(3) A user may obtain a variance from a categorical pretreatment standard if the user can prove, pursuant to the procedural and substantive provisions in 40 CFR 403.13, that factors relating to its discharge are fundamentally different from the factors considered by EPA when developing the categorical pretreatment standard.
(4) A user may obtain a net gross adjustment to a categorical standard in accordance with 40 CFR 403.15.
(C) Reserved.
(D) Local limits.
(1) The following pollutant limits are established to protect against pass through and interference. No person shall discharge, or cause or permit to be discharged, wastewater containing in excess of the following instantaneous maximum allowable discharge limits into the following system(s):
Toxic Pollutant | TRA CRWS Instantaneous Maximum Allowable Discharge Limits (mg/l) | TRA Mountain Creek Instantaneous Maximum Allowable Discharge Limits (mg/l) |
Toxic Pollutant | TRA CRWS Instantaneous Maximum Allowable Discharge Limits (mg/l) | TRA Mountain Creek Instantaneous Maximum Allowable Discharge Limits (mg/l) |
Arsenic | 0.2 | N/A |
Cadmium | 0.1 | 0.8 |
Chromium | 2.9 | N/A |
Copper | 2.3 | 1.78 |
Cyanide | 0.5 | N/A |
Lead | 0.9 | 1.0 |
Mercury | 0.0004 | N/A |
Molybdenum | 0.8 | N/A |
Nickel | 4.6 | N/A |
Selenium | 0.1 | N/A |
Silver | 0.8 | N/A |
Zinc | 8.0 | 2.8 |
Oil and Grease | 200 | 200 |
Total Toxic Organics | 2.13 | N/A |
pH | 5.5 to 11.0 Standard Units | 6.0 to 9.0 Standard Units |
Chlorides | N/A | 7605 |
(2) The above limits apply at the point where the wastewater is discharged to the POTW. All concentrations for metallic substances are for “total” metal unless indicated otherwise. The Pretreatment Coordinator may impose mass limitations in addition to, or in place of, the concentration-based limitations above.
(E) Right of revision. The city reserves the right to establish, by ordinance or in wastewater discharge permits, more stringent standards or requirements on discharges to the POTW.
(F) 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 requirement. The Pretreatment Coordinator may impose mass limitations on users who are using dilution to meet applicable pretreatment standards or requirements, or in other cases when the imposition of mass limitations is appropriate.
(G) Plant loading.
(1) No industry shall discharge wastewater containing a BOD or TSS loading that causes the city’s pro-rata share of the total BOD or TSS loading to the POTW System to exceed the city’s pro-rata share of the total flow to the POTW System. (Example: If the city contributes 25% of the total wastewater flow to the system, the city’s cumulative BOD or TSS loading to the system, as measured at the city’s points of entry to the system, shall not exceed 25% of the total BOD or TSS loading to the system.)
(2) Any industry with a wastewater strength that will cause the city’s cumulative wastewater loading, at the city’s points of entry, to exceed the city’s pro-rata share of the total wastewater loading based upon flow, shall be required to install pretreatment facilities to reduce its wastewater strength to an acceptable level.
(Ord. 1424, passed 4-28-03; Am. Ord. OR-1742-09, passed 5-11-09; Am. Ord. OR-2047-17, passed 4-24-17)