(A) It is unlawful for anyone to discharge or permit the discharge of any industrial wastes into any public sewer unless prior approval by the City is obtained, as provided in subsection (A)15b of this Section if such industrial wastes have any of the following characteristics:
1. A standard five (5) day biochemical oxygen demand greater than four hundred (400) milligrams per liter (mg/l); or fifty (50) pounds in any one day;
2. A chemical oxygen demand greater than five hundred (500) mg/l; or eighty five (85) pounds in any one day;
3. Wastes containing more than four hundred (400) mg/l of suspended solids or fifty (50) pounds in any one day;
4. A flow of fifty thousand (50,000) gallons or more per average work day or a flow greater than five percent (5%) of the flow carried by the treatment facility receiving the waste;
5. Chlorine demand of more than twenty (20) mg/l;
6. Wastewater at a flow rate and/or pollutant discharge which is excessive over relatively short time periods so that there is a treatment process upset and subsequent loss of treatment efficiency;
7. Wastes containing harmful substances as enumerated in Section 6-3-060;
8. Food wastes and garbage, etc.;
9. Any liquid or vapor having a temperature higher than twenty seven degrees (27o) centigrade, eighty degrees (80o) Fahrenheit; or
10. Any soluble waste or wastes having a pH lower than 6.0 or higher than 9.0 or having any other corrosive property which reasonably could be hazardous to structures, equipment or personnel of the City such as but not limited to, battery or plating acids and wastes, copper sulfate, chromium salts and compounds or salt brine.
11. Any water or waste containing a toxic or poisonous substance in sufficient quantity to injure or interfere with any wastewater treatment process, to constitute a hazard to humans or to create any hazard to receiving waters or the effluent of the wastewater treatment plants. Liquids containing copper, zinc or similar toxic substances at the point of discharge to the City sewer shall not exceed the following limits:
Parameter | Maximum Month Average Daily | Maximum Instantaneous |
Aluminum | 3.00 mg/l | 5.00 mg/l |
Arsenic | 0.03 mg/l | 0.05 mg/l |
Total Ammonia as Nitrogen | 25.00 mg/l | 50.00 mg/l |
Cadmium | 0.01 mg/l | 0.02 mg/l |
Chromium (Hexavalent) | 0.05 mg/l | 1.00 mg/l |
Chromium (Total) | 1.00 mg/l | 2.00 mg/l |
Copper | 0.30 mg/l | 0.50 mg/l |
Cyanide (Total) | 0.20 mg/l | 0.50 mg/l |
Fluoride | 2.00 mg/l | 2.70 mg/l |
Iron | 2.00 mg/l | 5.00 mg/l |
Lead | 0.05 mg/l | 0.10 mg/l |
Nickel | 0.30 mg/l | 0.50 mg/l |
Zinc | 0.30 mg/l | 0.50 mg/l |
Mercury | 0.03 mg/l | 0.05 mg/l |
Silver | 0.03 mg/l | 0.05 mg/l |
12. Any material which exerts or causes:
(a) Concentrations of inert suspended solids, such as, but not limited to, fuller's earth, lime slurries, lime residue, or fly ash which are so high as to constitute a danger to the wastewater treatment plant.
(b) Concentrations of dissolved solids such as, but not limited to, sodium chloride, calcium chloride or sodium sulfate, which are so high as to constitute a danger to the wastewater treatment plant.
13. Any wastes containing chlorinated hydrocarbons in concentrations greater than 9.5 mg/l.
14. Any water or wastes which the Public Works Director determines will by itself or with other water or wastes in the public sewer system, release obnoxious gases; or develop color or undesirable intensity; or form suspended solids in objectionable concentrations; or create any other condition deleterious to life, structures, or treatment processes.
15. (a) Waters or wastes containing substances in such concentrations that they are not amenable to treatment or reduction by wastewater treatment processes employed or are amenable to treatment only to such degree that the wastewater treatment plant effluent cannot meet the requirements of any other agency having jurisdiction over discharge to the receiving waters.
(b) It is unlawful for anyone to discharge or permit the discharge of industrial wastes as enumerated in this Section unless prior written approval is obtained from the City. If any industrial wastes are discharged or are proposed to be discharged into a public sewer, which wastes contain the substances or possess the characteristics enumerated in Section 6-3-070, and which, in the judgment of the City may have a deleterious effect upon the wastewater treatment processes, equipment or receiving waters, or which otherwise create a hazard to life or create malodors, the City may:
(1) Reject the waste; or
(2) Require preliminary treatment to an acceptable condition for discharge to the public sanitary sewer system and/or sampling and metering manholes and equipment and/or may;
(3) Require reduction of the standard five (5) day biochemical oxygen demand to less than four hundred (400) mg/l; and/or
(4) Require reduction of the suspended solids content to less than four hundred (400) mg/l; and/or
(5) Require reduction in chemical oxygen demand to less than five hundred (500) mg/l; and/or
(6) Require regulation of the quantities of organic and inorganic loads and/or rates of discharge; and/or
(7) Require payment of a charge and fee for the cost and expenses of processing such water or wastes so admitted into the sewer system and any other costs or charges that would be and are incurred by the City in the maintenance, operation, replacement and repair of the sewer system and wastewater treatment facilities caused by such waters or wastes into the system.
(c) Plans, specifications and other information relating to the construction or installation of preliminary treatment and other facilities required by this Chapter shall be submitted by the industry to the City.
The industry shall comply with the Environmental Protection Agency (EPA) pretreatment regulations as published in the Federal Register, volume 38, number 215, dated November 8, 1973. No construction or installation thereof shall commence until written approval of the plans and specifications by the City. Every facility for the preliminary treatment or handling of industrial wastes shall be constructed in accordance with the approved plans and specifications, and shall be installed and maintained at the expense of the occupant or owner of the property discharging the industrial wastes.
(1) Any person constructing a preliminary treatment facility, as required by the City shall also install at his sole expense, and maintain a sampling and metering manhole for checking and investigating the discharge from the preliminary treatment facility to the public sewer. Such sampling and metering manhole shall be placed in a location approved by the City and in accordance with specifications approved by the City.
(2) Wastes requiring pretreatment for pH control and adjustment, temperature control and adjustment of dissolved oxygen must be continuously metered, and a fail-safe guarantee including alarms and holding ponds must be provided to assure quality of effluent.
(3) The City may require any person constructing a preliminary treatment facility to provide flow measurement.
(d) The City Council shall, in writing notify the occupant of any property which it has reason to believe is producing industrial wastes that such person shall comply with the requirements of this Chapter. No later than eighteen (18) months after notification by the City, the occupant or owner of the property discharging the industrial wastes shall have completed construction of all facilities required by this Chapter. Said occupant or owner shall submit periodic notice (at intervals not to exceed 6 months) to the City regarding specific actions taken to achieve full compliance with the requirements of this Chapter. The City may extend such requirements, upon agreement of State and Federal authorities, for reasonable cause, but no such extension of time shall excuse the payment of the charges imposed by Sections 6-4-050(B) and 6-4-100. If the required facilities have not been completed by the required date the City may shut off any sewer service from the City to the occupant, in addition to other penalties provided by this Chapter; provided, no such service shall be terminated until written notice of at least ten (10) days has been given by the City.
(e) Every facility for preliminary treatment or handling of industrial wastes shall be subject to inspection by the City or its authorized representative, who shall determine whether or not such facility has been constructed and is being maintained in effective operation. (Ord. 632, 7-28-93)