(a) The City shall make and enforce rules and regulations establishing the types and characteristics of sewage, industrial wastes and other matter which shall be discharged into the sanitary sewerage system, the types and characteristics of sewage and industrial wastes admissible to the system only after pretreatment, requisites for pretreatment, and otherwise governing the discharge of sewage, industrial wastes and other matter into the system in the interest of safety and efficient operation of the wastewater treatment plant.
(b) An industry must, upon application for sewer service, present to the City a tabulation of the chemical analysis of the wastes to be discharged to the sewerage system and the volume of such waste, or, if this is not available, the expected waste analysis based upon similar processes now in operation.
(c) In cases where the character of sewage or industrial waste from any manufacturing or industrial plant, building or premises is such that it will damage the sewerage system or cannot be treated satisfactorily at the wastewater treatment plant, the City shall compel such users to dispose of such waste and prevent it from entering the sewerage system.
(d) In cases where the character of the sewage or industrial waste from any manufacturing or industrial plant, building or premises shows excessive flow rates or concentration of pollutants such that it imposes an unreasonable burden upon the sewage collection, pumping or treatment works greater than that imposed by the average sewage entering the sewerage system, the City may: compel such manufacturing or industrial plant, building or premises to pretreat such sewage in such manner as specified by the City before discharging it into the sewerage system; require flow control or equalization of such wastes so as to avoid any slug loads or excessive loads that may be harmful to the treatment works; or require payment of a surcharge on any excessive flows or loadings discharged to the treatment works to cover the additional costs of having capacity for and treating such wastes.
(e) The discharge of nonacceptable industrial wastewater into the sewerage system, whether directly or indirectly, is prohibited. Wastewater shall be deemed nonacceptable when the concentration of harmful or toxic substances in the wastewater exceeds certain prescribed tolerable limits. Toxic or harmful substances include, but are not necessarily limited to the following:
Toxic or Harmful Substance | Tolerable Limits (in milligrams per liter) |
Arsenic | 0.2 |
Barium | 1.0 |
Boron | 5.0 |
Cadmium | 0.1 |
Chromium+ 3 | 0.5 |
Chromium +6 | 0.5 |
Cobalt | 1.0 |
Copper | 0.5 |
Cyanide (HCN) | 0.5 |
Fluoride | 5.0 |
Iron | 5.0 |
Lead | 0.5 |
Mercury | 0.02 |
Molybdenum | 5.0 |
Nickel | 2.0 |
Phenols | 5.0 |
Selenium | 0.10 |
Silver | 0.03 |
Sulfides | 50.0 |
Total dissolved solids | 1,500.0 |
Tungsten | 5.0 |
Zinc | 2.0 |
This list of toxic or harmful substances is subject to revisions as required to meet current water quality standards or effluent standards imposed by State or federal agencies. In special cases (low volume users), the concentration of toxic or harmful substances in the wastewater may be exceeded if it is determined by the City that the total pounds of toxic or harmful substances discharged to the sewage system is not harmful to or will not interfere with the sewage treatment process or will not violate water quality or effluent standards.
(f) No person shall discharge or cause to be discharged, either directly or indirectly to the sewerage system, any of the following described substances, materials, waters or wastes:
(1) Any liquid or vapor having a temperature higher than 150° Fahrenheit or causing the temperature at the treatment facility to exceed 104° Fahrenheit.
(2) Any gasoline, benzene, naphtha, fuel oil, mineral oil or other volatile, flammable or explosive liquid, solid or gas.
(3) Any noxious or malodorous gas or substance which, either singly, or by interaction with other wastes, is capable of creating a public nuisance or hazard to life or of preventing entry into the sewers for their maintenance and repair.
(4) Any waters or wastes having a pH lower than 5.5 or higher than 9.0, or having any other corrosive property of causing damage or hazard to structures, equipment or personnel of the sewerage system.
(5) Any ashes, cinders, sand, mud, straw, shavings, metal, glass, rags, feathers, tar, plastics, wood, paunch manure, hair and fleshings, entrails, lime slurry, lime or chemical or paint residues, cannery waste bulk solids or any other solid objects or viscous substance capable of causing obstruction to the flow operation of the sewerage system.
(6) Any waters or wastes containing a toxic or poisonous substance in sufficient quantity to injure or interfere with any sewage treatment process, constitute a hazard to humans or animals, or create any hazard in the receiving waters of the sewerage system.
(7) Any water or wastes containing emulsified oil or grease exceeding, on analysis, an average of fifty milligrams of oil and grease per liter determined from the total soluble matter.
(8) Any garbage that has not been properly shredded to a degree that all particles will be carried freely under the flow conditions of the sewer and with no particle greater than one-half inch in any dimension.
(9) Any water or wastes containing suspended solids of such character or quality that unusual attention or expense is required to handle such materials at the sewage treatment plant, or having a chlorine demand greater than twenty-five parts per million.
(10) Any water or wastes discharged in large enough quantities to cause a violation of the City's NPDES permit or to make the sludge unsuitable for reclamation.
(11) Any water or wastes discharged in large enough quantities to cause the effluent from the treatment works to be objectionably colored.
(12) Radioactive wastes or isotopes of such half-life or concentration as may exceed limits in compliance with applicable State or federal regulations.
(13) The above list is subject to revisions as required to meet current water quality standards imposed by the State or federal agencies.
(g) No statement contained in this section shall be interpreted as preventing any special agreement or arrangement between the City and any industrial concern whereby an industrial waste of unusual strength or character may be accepted by the City for treatment. In all such cases, the provisions set forth in Chapter 935 will be governing factors in any contracts entered into.
(Ord. 9(82-83). Passed 5-24-82.)