§ 25-843. Certain discharges into public sewers limited and regulated.

(a)

The following substances, materials, waters or waste shall be limited in discharges to municipal system to the concentrations or quantities which will not harm either the sewers, sewage treatment process or equipment, will not have an adverse effect on the receiving stream, or will not otherwise endanger lives, limb, public property, or constitute a nuisance. The director of public utilities may set limitations lower than the limitations established in the regulations below if in its opinion such more severe limitations are necessary to meet the above objectives. In forming the opinion as to acceptability, the director will 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 sewage treatment process employed, capacity of the sewage treatment plant, degree of treatability of the waste in the sewage treatment plant, NPDES permit requirements, and other pertinent factors. The limitations or restrictions on materials or characteristics of waste or waste waters discharged to the sanitary sewer which shall not be violated without approval of the director of public utilities are as follows:

(1)

Any waste water having a temperature higher than one hundred fifty (150) degrees Fahrenheit (sixty-five (65) degrees Celsius).

(2)

Any waste water containing more than twenty-five (25) milligrams per liter of petroleum oil, nonbiodegradable cutting oils, or product of mineral oil origin.

(3)

Any water or waste containing animal fats, wax, grease, or oils, whether emulsified or not, in excess of one hundred (100) milligrams per liter or containing substances which may demulsify, solidify, or become viscous at temperatures between thirty-two (32) and one hundred fifty (150) degrees Fahrenheit (zero (0) and sixty-five (65) degrees Celsius).

(4)

Any garbage that has not been properly shredded. Garbage grinders may be connected to sanitary sewers from homes, hotels, 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 consumption elsewhere when served by caterers.

(5)

Waste water containing substances which are not amenable to treatment or reduction by the waste water treatment or reduction by the waste water treatment processes employed, or are amenable to treatment only to such degree that the sewage treatment facilities effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.

(6)

Any waste water which, alone or by interaction with other waste water in the public sewer system, releases obnoxious gases, forms suspended solids which interfere with the collection system or creates a condition deleterious to structures and treatment processes.

(7)

Any radioactive wastes or isotopes of such half-life or concentrations as may exceed limits established by the city engineer in compliance with applicable state or federal regulations.

(8)

Any waste water containing unusual concentrations of inert suspended solids (such as, but not limited to, fuller's earth, lime slurries, and lime residues) or of dissolved solids (such as, but not limited to, sodium chloride and sodium sulfate).

(9)

Any waste water containing or causing excessive discoloration (such as, but not limited to, dye wastes and vegetable tanning solutions).

(10)

Any waste water having biochemical oxygen demand (BOD) or chemical oxygen demand (COD) in excess of one thousand (1,000) parts per million and chlorine (cl ₂ ) demand in excess of twenty-five (25) parts per million.

(11)

Any waste water having a volume of flow in excess of fifty thousand (50,000) gallons per day or concentration of wastes constituting slugs.

(12)

Any waste water containing toxic or poisonous substances in sufficient quantity either singularly or following interaction with any other substance, to injure or interfere with any waste water treatment process, to constitute a hazard to humans or animals, or to create any hazard in the receiving waters of the waste water treatment facilities.

(13)

Any waste water containing phenols greater than five (5) parts per million.

(14)

Any waste water containing cyanide (CN) greater than one (1) part per million.

(15)

Any waste water containing iron greater than ten (10) parts per million.

(16)

Any waste water containing trivalent chromium greater than ten (10) parts per million.

(17)

Any waste water containing greater than one (1) part per million individually or five (5) parts per million collectively of silver, hexavalent chromium, copper, nickel, cadmium, zinc and tin.

(b)

If any waters or wastes are discharged, or are proposed to be discharged to the public sewers, which waters contain the substances or possess the characteristics enumerated in subsection (a) of this section, and which in the judgment of the director of public utilities, may have a deleterious effect upon the sewage works, processes, equipment, or receiving waters, or which otherwise create a hazard to life or constitute a public nuisance, the city may:

(1)

Reject the wastes.

(2)

Require pretreatment to an acceptable condition for discharge to the public sewers.

(3)

Require control over the quantities and rates of discharge.

(4)

Require payment to cover the added cost of handling and treating the wastes not covered by existing taxes or sewer charges.

If the director of public utilities permits the pretreatment or equalization of waste flows, the design and installation of the plants and equipment shall be subject to the requirements of all applicable codes, ordinances and laws.

(Code 1984, Title 4, § 440(5))