(a) 
General Prohibitions.
(1) 
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) 
Stormwater and all other unpolluted drainage shall be discharged to sewers that are specifically designated as storm sewers, or to a natural outlet approved by the city manager. No liquid, semi-liquid, ready-mixed concrete, mortar, asphalt material, or chemical waste shall be deposited in any area that will drain to the storm sewer or natural outlet.
(b) 
Specific prohibitions.
No user shall introduce or cause to be introduced into the POTW the following pollutants, substances, or wastewater:
(1) 
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;
(2) 
Wastewater having a pH less than 5.5 or more than 11.0, or otherwise causing corrosive structural damage to the POTW or equipment;
(3) 
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;
(4) 
Pollutants, including oxygen-demanding pollutants (BOD, etc.), released in a discharge at a flow rate or pollutant concentration which, either singly or by interaction with other pollutants, will cause interference with the POTW;
(5) 
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);
(6) 
Petroleum oil, non-biodegradable cutting oil, or products of mineral oil origin, in amounts that will cause interference and/or pass through, and in amounts specified in section 86-102 of this article;
(7) 
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;
(8) 
Trucked or hauled pollutants, except at discharge points designated by the city manager and in accordance with section 86-111 of this article;
(9) 
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;
(10) 
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 TPDES permit;
(11) 
Wastewater containing any radioactive wastes or isotopes except in compliance with applicable state or federal regulations;
(12) 
Stormwater, surface water, ground water, artesian well water, roof runoff, subsurface drainage, and unpolluted wastewater, unless specifically authorized by the city manager;
(13) 
Sludges, screenings, or other residues from the pretreatment of industrial wastes;
(14) 
Medical wastes, except as specifically authorized by the city manager, that do not cause or contribute to pass through and/or interference;
(15) 
Wastewater causing, alone or in conjunction with other sources, the treatment plant's effluent to fail a toxicity test;
(16) 
Detergents, surface-active agents, or other substances which may cause excessive foaming in the POTW;
(17) 
Fats, oils, or greases of animal or vegetable origin in concentrations greater than that specified in the applicable local limits in section 86-102;
(18) 
A discharge of water, normal domestic wastewater, or industrial waste which in quantity of flow exceeds, for a duration of longer than fifteen minutes, more than four times the average twenty-four-hour flow during normal operations of the industry;
(19) 
Insecticides and herbicides in concentrations that are not amenable to treatment;
(20) 
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 (1/2) inch cross-sectional dimension;
(21) 
Wastewater or industrial waste generated or produced outside the city, unless approval in writing from the city manager has been given to the person discharging the waste; or
(22) 
Without the approval of the city manager, 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.
(c) 
Processing and storage.
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.
[Ordinance 2409 adopted 10/8/2024]
The categorical pretreatment standards found at 40 CFR chapter I, subchapter N § 405 — 471 are hereby incorporated.
(a) 
Where a categorical pretreatment standard is expressed in terms of either the mass or the concentration of a pollutant in wastewater, the city manager may impose equivalent concentration or mass limits in accordance with 40 CFR § 403.6(c)(1).
(b) 
When wastewater subject to a categorical pretreatment standard is mixed with wastewater not regulated by the same standard, the city manager shall impose an alternate limit using the combined wastestream formula in 40 CFR § 403.6(e).
(c) 
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 the EPA when developing the categorical pretreatment standard.
(d) 
A user may obtain a net gross adjustment to a categorical standard in accordance with 40 CFR § 403.15.
[Ordinance 2409 adopted 10/8/2024]
(a) 
The following pollutant limits are established to protect against pass through and interference and apply at the point where the wastewater is discharged to the POTW. No person shall discharge, or cause or permit to be discharged, wastewater containing in excess of the following instantaneous maximum allowable discharge limits.
(1) 
Toxic pollutants specified in the following table:
Toxic Pollutant
Instantaneous Maximum Allowable Discharge Limit (mg/L)
Arsenic
0.2
Cadmium
0.1
Chromium
2.1
Copper
1.8
Cyanide
0.4
Lead
1.2
Mercury
0.06
Molybdenum
0.5
Nickel
3.3
Selenium
0.2
Silver
0.8
Zinc
6.1
Oil and Grease
200
pH
5.5-11.0 Standard Units
(b) 
All concentrations for metallic substances are for "total" metal unless indicated otherwise. The city manager may impose mass limitations in addition to, or in place of, the concentration-based limitations above.
[Ordinance 2409 adopted 10/8/2024]
The city reserves the right to establish, by article or in wastewater discharge permits, more stringent standards or requirements on discharges to the POTW.
[Ordinance 2409 adopted 10/8/2024]
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 city manager 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.
[Ordinance 2409 adopted 10/8/2024]
(a) 
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.)
(b) 
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.
[Ordinance 2409 adopted 10/8/2024]
Users shall provide wastewater treatment as necessary to comply with this article and shall achieve compliance with all categorical pretreatment standards, local limits, and the prohibitions set out in section 86-100 of this article within the time limitations specified by EPA, the state, or the city manager whichever is more stringent. Any facilities necessary for compliance shall be provided, operated, and maintained at the user's expense. Detailed plans describing such facilities and operating procedures shall be submitted to the city manager for review, and shall be acceptable to the city manager before the facilities are constructed. The review of such plans and operating procedures shall in no way relieve the user from the responsibility of modifying such facilities as necessary to produce a discharge acceptable to the city under the provisions of this article.
[Ordinance 2409 adopted 10/8/2024]
(a) 
Whenever deemed necessary, the city manager may require users to restrict their discharge during peak flow periods, designate that certain wastewater be discharged only into specific sewers, relocate and/or consolidate points of discharge, separate sewage wastestreams from industrial wastestreams, and require such other conditions as may be necessary to protect the POTW and determine the user's compliance with the requirements of this article.
(b) 
The city manager may require any person discharging into the POTW to install and maintain, on their property and at their expense, a suitable storage and flow-control facility to ensure equalization of flow. A wastewater discharge permit may be issued solely for flow equalization.
[Ordinance 2409 adopted 10/8/2024]
Grease, oil, and sand interceptors shall be provided when, in the opinion of the city manager they are necessary for the proper handling of wastewater containing excessive amounts of grease and oil, or sand; except that these interceptors shall not be required for residential users. All interception units shall be of type and capacity approved by the city manager and shall be so located to be easily accessible for cleaning and inspection. Such interceptors shall be inspected, cleaned, and repaired regularly, as needed, by the user at the user's expense.
[Ordinance 2409 adopted 10/8/2024]
Users with the potential to discharge flammable substances may be required to install and maintain an approved combustible gas detection meter or other control device as deemed necessary by the pretreatment coordinator.
[Ordinance 2409 adopted 10/8/2024]
(a) 
The city manager shall evaluate whether each permitted significant industrial user needs a slug control plan or other action to control slug discharges no later than (1) one year of the SIU determination. The city manager may require any user to develop, submit for approval, and implement such a plan. All the activities associated with slug control evaluation and results are to be kept in the industrial user file.
(b) 
A slug control plan shall address, at a minimum, the following:
(1) 
Description of discharge practices, including nonroutine batch discharges;
(2) 
Description of stored chemicals;
(3) 
Procedures for immediately notifying the city manager and control authority of any slug discharge, as required by section 86-132 of this article; and
(4) 
Procedures to prevent adverse impact from any slug discharge. Such procedures include, but are not limited to, inspection and maintenance of storage areas, handling and transfer of materials, loading and unloading operations, control of plant site runoff, worker training, building of containment structures or equipment, measures for containing toxic organic pollutants, including solvents, and/or measures and equipment for emergency response.
[Ordinance 2409 adopted 10/8/2024]
(a) 
Septage waste may be introduced into the POTW only at locations designated by the city manager and control authority, and at such times as are established by the city manager and control authority. Such waste shall not violate section 86-100 through 86-102 of this article or any other requirements established by the city. The city manager and/or control authority may require septic tank waste haulers to obtain wastewater discharge permits.
(b) 
Septage waste haulers must provide a waste-tracking form for every load. This form shall include, at a minimum, the name and address of the waste hauler, permit number, truck identification, names and addresses of sources of waste, and volume and characteristics of waste. The form shall identify the type of generator, known or suspected waste constituents, and whether any wastes are RCRA hazardous wastes.
[Ordinance 2409 adopted 10/8/2024]
The city manager may develop best management practices and require users to implement such BMPs if necessary to protect the POTW. Such BMPs would be supplemental and not used as a replacement for compliance with local limits listed in section 86-102 and prohibited discharge standards in section 86-100.
[Ordinance 2409 adopted 10/8/2024]