(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, commonwealth, or local pretreatment standards or requirements.
(2) Specific prohibitions.
(a) 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 C.F.R. § 261.21;
2. Wastewater having a pH less than 5.5 or more than 9.0, 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 with the proper operation of the sanitary sewer and wastewater treatment plant system of the city;
4. Pollutants, including oxygen-demanding pollutants (BOD, and the like), 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 150°F, 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 or pass through;
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; and
8. Trucked or hauled pollutants, except at discharge points designated by the Superintendent in accordance with § 53.55(C).
(b) 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.
(1) Users must comply with the categorical pretreatment standards found at 40 C.F.R. Ch. I, Subchp. N, pts. 405 through 471.
(2) When wastewater subject to a categorical pretreatment standard is mixed with wastewater not regulated by the same standard, the Superintendent shall impose an alternate limit in accordance with 40 C.F.R. § 403.6(e).
(C) Commonwealth pretreatment standards. Users must comply with city pretreatment standards codified at KRS Ch. 224 and Kentucky Administrative Regulations thereto.
(D) Local limits.
(1) The Superintendent is authorized to establish local limits pursuant to 40 C.F.R. § 403.5(c).
(2) (a) The following pollutant limits are established to protect against pass through and interference.
(b) No person shall discharge wastewater containing in excess of the following daily maximum limit:
Arsenic | 2.33 |
Cadmium | 0.03 |
Chromium, Total | 2.77 |
Chromium, Hexavalent | 0.21 |
Copper | 3.39 |
Cyanide | 0.27 |
Iron | 10 |
Lead | 0.62 |
Mercury | 0.007 |
Nickel | 3.17 |
Selenium | 0.22 |
Silver | 1.01 |
Zinc | 1.74 |
(c) 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 Superintendent may impose mass limitations in addition to the concentration-based limitations above.
(E) City’s right of revision. The city reserves the right to establish, by ordinance or in individual wastewater discharge permits, more stringent standards or requirements on discharges to the POTW consistent with the purpose of this subchapter.
(F) Dilution.
(1) 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.
(2) The Superintendent may impose 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.
(Ord. 775-11, passed 7-11-2011; Ord. 806-16, passed - -2016)