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GENERAL SEWER USE REQUIREMENTS
(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, 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 5.0 or more than 10.0, 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, but in no case solids greater than 1/2 inch(es) (0.5") or 1.27 centimeter(s) (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 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, nonbiodegradable 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;
(8) Trucked or hauled pollutants, except at discharge points designated by the Utilities Manager in accordance with § 3.4 of this appendix;
(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 (No. IN0025666);
(11) Wastewater containing any radioactive wastes or isotopes except 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, noncontact cooling water, and unpolluted wastewater, unless specifically authorized by the Utilities Manager;
(13) Sludges, screenings, or other residues from the pretreatment of industrial wastes;
(14) Medical wastes, except as specifically authorized by the Utilities Manager in a wastewater discharge permit;
(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.
(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.
(Ord. 1998-20, passed 11-17-98; Am. Ord. 2012-19, passed 9-18-12)
(A) In the event an IU discharges abnormal industrial wastes to the POTW having an average total suspended solids (TSS) content in excess of 250 mg/l and/or an average of five day BOD in excess of 225 mg/l, and/or an average of COD in excess of 500 mg/l, the customer will be subject to a surcharge based upon the excess strength of his waste at the rates established in § 51.166 of this code.
(B) No reduction in sewerage service charges, fees, or taxes will be permitted because of the fact that certain industrial wastes discharged to the public sanitary sewerage system contain less than 250 mg/l of total suspended solids, or 225 mg/l BOD5.
(Ord. 1998-20, passed 11-17-98; Am. Ord. 2012-19, passed 9-18-12; Am. Ord. 2019-9, passed 12-3-19)
The categorical pretreatment standards found at 40 CFR Chapter I Subchapter N, Parts 405-471 are hereby incorporated.
(A) Where a categorical pretreatment standard is expressed only in terms of either the mass or the concentration of a pollutant in wastewater, the Utilities Manager may impose equivalent concentration or mass limits in accordance with 40 CFR 403.6(c).
(B) When wastewater subject to a categorical pretreatment standard is mixed with wastewater not regulated by the same standard, the Utilities Manager shall impose an alternate limit using the combined wastestream formula in 40 CFR 403.6(e).
(C) A user may apply for 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.
(D) A user may apply for a net gross adjustment to a categorical standard in accordance with 40 CFR 403.15.
(Ord. 1998-20, passed 11-17-98; Am. Ord. 2012-19, passed 9-18-12)
(A) The following pollutant limitations are established to protect against pass through and interference. No person shall discharge wastewater containing in excess of the following daily. maximum concentrations based upon a 24-hour composite sample. Additionally, no person shall discharge wastewater containing in excess of the following maximum concentrations times a multiplier of 1.5 based upon a grab sample. The 1.5 grab sample multiplier does not apply to Hex. Chromium, Cyanide and Phenols in that analytical procedures do not allow for composite techniques to be applied to these parameters. For Hex. Chromium, Cyanide and Phenols, three grab sample results shall be analyzed with results not to exceed the following noted limitations.
.168 mg/l Arsenic (total)[1] |
.034 mg/l Cadmium (total)[1] |
.143 mg/l Hex. Chromium |
10.8 mg/l Total Chromium |
1.13 mg/l Copper[2] |
.515 mg/l Cyanide (total)[2] |
.40 mg/l Lead (total)[1] |
.03 mg/l Mercury (total)[1] |
.067 mg/l Molybdenum (total)[1] |
2.52 mg/l Nickel[1] |
[1] Limitation determination based upon U.S. EPA 40 CFR Part 503 Biosolids Regulations. |
[2] Limitation determination based upon NPDES Daily Effluent Limitations. |
100 mg/l Oil & Grease[3] |
.09 mg/l Selenium[1] |
.5 mg/l Silver |
1.0 mg/l Phenols |
3.62 mg/l Zinc (total)[1] |
[1] Limitation determination based upon U.S. EPA 40 CFR Part 503 Biosolids Regulations. |
[3] As an alternative to the total oil and grease limitations established by this section, the Control Authority may establish in an IWP a limitation of 100 mg/1 for non-polar grease. The alternative limitation is subject to the following conditions: |
1. The user submits an application for the alternative limit; |
2. The user provides information regarding the user's products, processes, and operations that shows to the Control Authority's satisfaction that the oil and grease discharge by the user is predominantly of animal or vegetable origin; |
3. The user shows that the oil and grease in the user's discharges is not visible, free, or floating at 50 F at any time; |
4. The user has sampling facilities that allow for both visual inspections of the user's discharge and using the equipment necessary for collection samples for floatable oil and grease; |
5. The oil and grease in the user's discharge is not related to past instances of obstruction, interference, or pass though; |
6. Users subject to the alternative limit shall continue to operate and maintain grease traps and any other oil and grease separation and treatment equipment and shall continue all existing practices that reduce discharge of oil and grease; |
7. If the Control Authority determines that a user subject to the alternative limits has caused, along or in conjunction with other discharge, obstructions, interference, or pass through, then the user shall comply with the total oil and grease limitation or another appropriate limitation established by the District in the user's IWP; and |
8. Any other appropriate conditions set forth in the user's SIU. |
(B) 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 Utilities Manager may impose mass limitations in addition to, or in place of, the concentration-based limitations above.
(C) Upon the promulgation of the National Categorical Pretreatment Standard (NCPS) for a particular user, the said standard, if more stringent then the limitations imposed under this appendix for sources in that category, shall, when effective, immediately supersede the limitations and conditions imposed under this appendix. The Utility Manager shall notify all known affected users of the applicable permitting and reporting requirements under 40 CFR 403.12.
(Ord. 1998-20, passed 11-17-98; Am. Ord. 2012-19, passed 9-18-12; Am. Ord. 2019-9, passed 12-3-19)
The Board reserves the right to establish, by ordinance or in wastewater discharge permits, more stringent standards or requirements on discharges to the POTW consistent with the purposes of this appendix.
(Ord. 1998-20, passed 11-17-98; Am. Ord. 2012-19, passed 9-18-12)
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