§ 50.023  POLLUTANT DISCHARGE LIMITS.
   (A)   General conditions. The following described substances, materials, waters or wastes shall be limited in discharges to municipal systems to concentration or quantities which: will not harm either the sewers, wastewater treatment process or equipment, will maintain and protect water quality in the lives, limb, public property, or constitute a nuisance. The Director of Engineering and Utilities may set additional limitations or limitations more stringent than those established in the provisions below if in his or her opinion more severe limitations are necessary to meet the above objectives. In forming his or her opinion as to the acceptability of a discharge, the Director shall give consideration to such factors as the quantity of subject waste in relation to flows and velocities in the sewers, materials of construction of the sewers, the wastewater treatment process employed, capacity of the wastewater treatment plant, and other pertinent factors.
   (B)   Restricted discharges.
      (1)   Wastewater containing more than 100 mg/l of hydrocarbon oil, nonbiodegradable cutting oils, or products of mineral oil origin.
      (2)   Wastewater containing total oil and grease, floatable oils, fat, or grease, whether emulsified or not, in amounts which may cause pass through or upset of the POTW or may solidify or become viscous at temperate between 32 degrees Fahrenheit and 150 degrees Fahrenheit (zero degrees Celsius and 65 degrees Celsius).
      (3)   Any garbage that has not been properly shredded. Garbage grinders may not be connected to sanitary sewers from homes, motels, institutions, restaurants, hospitals, catering establishments, or similar places where garbage originates from the preparation of food in kitchens for the purpose of consumption on the premises or when served by caterers.
      (4)   Any wastewater containing toxic pollutants in sufficient quantity, either singly or by interaction with other pollutants which: injure or interfere with any wastewater treatment process, constitute a hazard to humans or animals, causes the city to violate the terms of its KPDES permit, prevents the use of acceptable sludge disposal methods, or exceed a limitation set forth in a categorical pretreatment standard.
      (5)   Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the city in compliance with applicable state or federal regulations.
      (6)   Any water or wastes which by interaction with other water or wastes in the public sewer system, release obnoxious gases, form suspended solids which interfere with the collection system, or create a condition deleterious to structures and treatment processes.
      (7)   Any wastewater with objectionable color which cannot be removed to an acceptable level within the operation of the wastewater treatment process.
      (8)   Waters or wastes containing substances which are not amenable to treatment or reduction by the wastewater treatment processes employed to the extent required by the city’s NPDES/KPDES permit.
      (9)   Any waste(s) or wastewater(s) classified as a hazard waste by the Resource Conservation and Recovery Act (RCRA) without a 60-day prior notification of such discharge to the Director of Engineering and Utilities. This notification must include the name of the hazardous waste, the EPA hazardous waste number, type of discharge, volume/mass of discharge and time of occurrence(s). The Director may prohibit or condition the discharge(s) at any time.
   (C)   Surcharge limits.
      (1)   Any water or wastes which have characteristics based on a 24-hour composite sample, grab or a shorter period composite sample, if more representative, that exceed the following normal maximum domestic wastewater parameter concentrations:
MAXIMUM ALLOWABLE CONCENTRATION WITHOUT SURCHARGES
PARAMETER
LIMITS
UNITS
PARAMETER
LIMITS
UNITS
Biochemical Oxygen Demand (BOD)
250
mg/l
Chemical Oxygen Demand (COD)
658
mg/l
Total Suspended Solids (TSS)
250
mg/l
Ammonia Nitrogen (NH3-N)
20
mg/l
Oil & Grease, Total
50
mg/l
Thiocyanate (SCN)
0
mg/l
NOTE:  Surcharges shall be levied for excess BOD or COD, whichever is higher, but not both.
 
      (2)   Any user discharging wastewater exceeding the maximum allowable concentration as noted above, shall be subject to a surcharge fee for each pound loading over and above the set limit as listed below:
 
PARAMETER
RATE/POUND
Biochemical Oxygen Demand (BOD) or Chemical Oxygen Demand (COD)
$0.2193
Total Suspended Solids (TSS)
$0.2706
Ammonia Nitrogen (NH3-N)
$0.5327
Oil & Grease, Total
$0.5007
Thiocyanate (SCN)
As stated below
 
      (3)   Any other amenable constituents requiring the addition of specific chemicals for proper treatment will also be subject to surcharge as noted on the wastewater discharge permit. Exceeding the effluent limits specified above shall not be deemed to constitute a violation of a permit condition of these regulations if the appropriated surcharge fee is paid and the discharge does not cause interference or pass through of the POTW.
   (D)   Local limits.
      (1)   The Director is authorized to establish local limits pursuant to 40 CFR 403.5(c).
      (2)   The following daily maximum discharge limitations are established for characteristics of any wastewaters to be discharged into the municipal sewer system. All users must comply with these limitations if they are more stringent than applicable state and or federal regulations.
PARAMETER
LIMITS
UNITS
PARAMETER
LIMITS
UNITS
pH
<6
s.u.
Arsenic (As)
0.96
mg/l
Cadmium (Cd)
0.007
mg/l
Chromium, Total (Cr)
3.47
mg/l
Chromium, Hexavalent (Cr+6)
0.36
mg/l
Copper (Cu)
0.79
mg/l
Cyanide, Free
1.19
mg/l
Lead (Pb)
0.50
mg/l
Mercury (Hg)
0.004
mg/l
Nickel (Ni)
1.65
mg/l
Oil and Grease, Hydrocarbon
100
mg/l
Phenols
97.5
mg/l
Selenium
0.05
mg/l
Silver (Ag)
1.90
mg/l
Zinc (Zn)
3.19
mg/l
 
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. Director may impose mass limitations in addition to the concentration-based limitations above.
      (3)   The Director may develop Best Management Practices (BMPs), by ordinance or in individual wastewater discharge permits or general permits, to implement local limits and the requirements of § 50.015.
(Ord. 62-2012, passed 8-16-12; Am. Ord. 30- 2015, passed 3-26-15; Am. Ord. 28-2016, passed 2-26-16; Am. Ord. 110-2016, passed 9-22-16; Am. Ord. 15, 2021, passed 2-25-21