[Ord. No. 5918 § 1, 4-25-2013; Ord. No. 7655, 6-23-2022]
A. 
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.
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, waste streams with a closed-cup flashpoint of less than one hundred forty degrees Fahrenheit (140° F.) (sixty degrees Celsius (60° C.)) using the test methods specified in 40 CFR 261.21;
2. 
Wastewater having a pH less than five and one-half (5.5) or more than ten (10), 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 but in no case solids greater than one-half (1/2) inch or one and twenty-seven hundredths (1.27) cm in any dimension;
4. 
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;
5. 
Wastewater having a temperature greater than one hundred four degrees Fahrenheit (104° F.) (forty degrees Celsius (40° 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 one hundred four degrees Fahrenheit (104° F.) (forty degrees Celsius (40° C.));
6. 
Petroleum oil, non-biodegradable cutting oil, or products of mineral oil origin in amounts that will cause interference or pass through at the POTW;
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 Manager in accordance with Section 715.130 of this Chapter;
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 City's NPDES permit;
11. 
Wastewater containing any radioactive wastes or isotopes not in compliance with applicable State or Federal regulations;
12. 
Storm water, surface water, ground water, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, deionized water, non-contact cooling water, and unpolluted wastewater not specifically authorized by the Manager;
13. 
Sludges, screenings, or other residues from the pretreatment of industrial wastes;
14. 
Medical wastes, not as specifically authorized by the Manager in an individual wastewater discharge permit;
15. 
Wastewater causing, alone or in conjunction with other sources, the treatment plant's effluent to fail toxicity test;
16. 
Detergents, surface-active agents, or other substances which might cause excessive foaming at the POTW not identified by the Manager;
17. 
Fats, oils, or greases of animal or vegetable origin in concentrations greater than one hundred (100) mg/l total oil and grease;
18. 
Wastewater causing two (2) readings on an explosion hazard meter at the point of discharge into the POTW, or at any point in the POTW, of more than five percent (5%) or any single reading over ten percent (10%) of the lower explosive limit of the meter.
C. 
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.
D. 
Any waste discharges containing the following pollutants to such a degree that the monthly average total mass loading from all SIU's exceed the quantity specified below. The Manager will distribute the permit limitations in pounds per day for all users that meet the definition of SIU as defined by City ordinance. At the discretion of the Manager, equivalent monthly average pollutant concentrations may be imposed. All metallic pollutants are for total metals and based on a twenty-four (24) hour composite sample unless otherwise authorized by the Manager. The Table of Masses is as defined in Exhibit B, Table of Allowable Industrial Mass.
Pollutant
Monthly Average Maximum Allowable Industrial Load (lbs/day)
Sample Type1
Silver
2.82
Composite
Arsenic
4.23
Composite
Cadmium
0.172
Composite
Cyanide
0.586
Grab
Chromium (total)
41.2
Composite
Copper
3.99
Composite
Mercury
0.078
Composite
Molybdenum
8.66
Composite
Nickel
6.94
Composite
Lead
0.930
Composite
Selenium
0.359
Composite
Zinc
9.59
Composite
QACs
12.8
Composite
MBAS
12.8
Composite
Chloride2
4,278
Composite
BOD5
7,470
Composite
TSS
6,550
Composite
Ammonia
864
Composite
1
The sample type shall be as specified unless specified otherwise by the Manager.
2
The Chloride effective date shall correspond to the effective date for the chloride effluent limit in the State Operating Permit for the wastewater treatment plant.
E. 
When the Manager determines that a user is contributing to the POTW, any of the above enumerated substances in such amounts as to interfere with the operation of the POTW, the Manager shall:
1. 
Advise the user of the impact of the contribution of the POTW; and
2. 
Develop effluent limitations for such user to correct the interference with the POTW.
[Ord. No. 5918 § 1, 4-25-2013; Ord. No. 7655, 6-23-2022]
A. 
Users must comply with the categorical pretreatment standards found at 40 CFR Chapter I, Subchapter N, Parts 405 — 471.
1. 
Where a categorical pretreatment standard is expressed only in terms of either the mass or the concentration of a pollutant in wastewater, the Manager may impose equivalent concentration or mass limits in accordance with Subsections (A)(4) and (5).
2. 
When the limits in a categorical pretreatment standard are expressed only in terms of mass of pollutant per unit of production, the Manager may convert the limits to equivalent limitations expressed either as mass of pollutant discharged per day or effluent concentration for purposes of calculating effluent limitations applicable to individual industrial users.
3. 
When wastewater subject to a categorical pretreatment standard is mixed with wastewater not regulated by the same standard, the Manager shall impose an alternate limit in accordance with 40 CFR 403.6(e).
4. 
When a categorical pretreatment standard is expressed only in terms of pollutant concentrations, an industrial user may request that the City convert the limits to equivalent mass limits. The determination to convert concentration limits to mass limits is within the discretion of the Manager. The City may establish equivalent mass limits only if the industrial user meets all the conditions set forth in Subsections (A)(5)(a)(1) through (A)(5)(a)(5) below.
5. 
Equivalent Mass Limits.
a. 
To be eligible for equivalent mass limits, the industrial user must:
(1) 
Employ, or demonstrate that it will employ, water conservation methods and technologies that substantially reduce water use during the term of its individual wastewater discharge permit;
(2) 
Currently use control and treatment technologies adequate to achieve compliance with the applicable categorical pretreatment standard, and not have used dilution as a substitute for treatment;
(3) 
Provide sufficient information to establish the facility's actual average daily flow rate for all waste streams, based on data from a continuous effluent flow monitoring device, as well as the facility's long-term average production rate. Both the actual average daily flow rate and the long-term average production rate must be representative of current operating conditions. Effluent flow monitoring devices shall be calibrated annually and a copy of the certification shall be submitted to the Manager as part of the reporting requirements;
(4) 
Not have daily flow rates, production levels, or pollutant levels that vary so significantly that equivalent mass limits are not appropriate to control the discharge; and
(5) 
Have consistently complied with all applicable categorical pretreatment standards during the period prior to the industrial user's request for equivalent mass limits.
b. 
An industrial user subject to equivalent mass limits must:
(1) 
Maintain and effectively operate control and treatment technologies adequate to achieve compliance with the equivalent mass limits;
(2) 
Continue to record the facility's flow rates through the use of a continuous effluent flow monitoring device;
(3) 
Continue to record the facility's production rates and notify the Manager whenever production rates are expected to vary by more than twenty percent (20%) from its baseline production rates determined in Subsection (A)(5)(a)(3) of this Section. Upon notification of a revised production rate, the Manager will reassess the equivalent mass limit and revise the limit as necessary to reflect changed conditions at the facility; and
(4) 
Continue to employ the same or comparable water conservation methods and technologies as those implemented pursuant to Subsection (A)(5)(a)(1) of this Section so long as it discharges under an equivalent mass limit.
c. 
When developing equivalent mass limits, the Manager:
(1) 
Will calculate the equivalent mass limit by multiplying the actual average daily flow rate of the regulated process(es) of the industrial user by the concentration-based daily maximum and monthly average standard for the applicable categorical pretreatment standard and the appropriate unit conversion factor;
(2) 
Upon notification of a revised production rate, will reassess the equivalent mass limit and recalculate the limit as necessary to reflect changed conditions at the facility; and
(3) 
May retain the same equivalent mass limit in subsequent individual wastewater discharge permit terms if the industrial user's actual average daily flow rate was reduced solely as a result of the implementation of water conservation methods and technologies, and the actual average daily flow rates used in the original calculation of the equivalent mass limit were not based on the use of dilution as a substitute for treatment pursuant to Section 715.090. The industrial user must also be in compliance with Section 715.660 regarding the prohibition of bypass.
[Ord. No. 5918 § 1, 4-25-2013; Ord. No. 7655, 6-23-2022]
Users must comply with Missouri State Pretreatment Standards codified at 10 CSR 20-6.100, General Pretreatment Regulation, et seq., as promulgated under Section 644.006, RSMo., the "Missouri Clean Water Act."
[Ord. No. 5918 § 1, 4-25-2013; Ord. No. 7655, 6-23-2022]
A. 
The Manager is authorized to establish local limits pursuant to 40 CFR 403.5(c).
B. 
Pollutant Limitations.
1. 
The Manager is authorized to establish local limits pursuant to Missouri 10 CSR 20-6.100.
2. 
Refer to Section 715.040(D) which references the Maximum Allowable Industrial Loads as authorized by 40 CFR 403.5(c) in lieu of uniform local limits.
C. 
The Manager may require the development of Best Management Practices (BMPs), by Chapter or in individual wastewater discharge permits, to ensure compliance with requirements of this Section.
[Ord. No. 5918 § 1, 4-25-2013; Ord. No. 7655, 6-23-2022]
The City reserves the right to establish, by Chapter or in individual wastewater discharge permits, more stringent standards or requirements on discharges to the POTW consistent with the purpose of this Chapter.
[Ord. No. 5918 § 1, 4-25-2013; Ord. No. 7655, 6-23-2022]
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 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.