§ 51.088 SUBSTANCES PROHIBITED IN PUBLIC SEWERS EXCEPT BY PERMISSION.

   No person shall discharge or cause to be discharged the following described substances, materials, waters or wastes if it appears likely in the opinion of the Inspector that the wastes can harm either the sewers, sewage treatment process or equipment, have an adverse effect on the receiving stream or can otherwise endanger life, limb, public property or constitute a nuisance. In forming his or her opinion as to the acceptability of these wastes, the Inspector will give consideration to the factors as the quantities of subject wastes in relation to flows and velocities in the sewers, materials of construction of the sewers, nature of the sewage treatment process, capacity of the sewage treatment plant, degree of treat-ability of wastes in the sewage treatment plant and other pertinent factors. The substances prohibited are:

   (A)   Any liquid or vapor having a temperature higher than 150°F (65°C);

   (B)   Any water or waste containing fats, wax, grease or oils, whether emulsified or not, in excess of 100 mg/l or containing substances which may solidify or become viscous at temperatures between 32°F and 150°F (0°C and 65°C);

   (C)   Any garbage that has not been properly shredded. The installation and operation of any garbage grinder equipped with a motor of three-fourths horsepower (0.76 hp metric) or greater shall be subject to the review and approval of the Inspector;

   (D)   Any waters or wastes containing strong acid iron pickling wastes or concentrated plating solutions, whether neutralized or not;

   (E)   Any waters or wastes containing iron, chromium, copper, zinc and similar objectionable or toxic substances; or wastes exerting an excessive chlorine requirement, to the degree that any material received in the composite sewage at the sewage treatment works exceeds the limits established by the Inspector for the materials;

   (F)   Any waters or wastes containing phenols or other taste or odor-producing substances, in the concentrations exceeding limits which may be established by the Inspector as necessary, after treatment of the composite sewage, to meet the requirements of the state, federal or other public agencies of jurisdiction for the discharge to the receiving waters;

   (G)   Any radioactive wastes or isotopes of the half-life or concentration as may exceed limits established by the Inspector in compliance with the applicable state or federal regulations;

   (H)   Any waters or wastes having a pH in excess of (9.5);

   (I)   Materials which exert or cause:

      (1)   Unusual concentrations of inert suspended solids (such as, but not limited to, fullers earth, lime slurries and lime residues) or of dissolved solids (such as, but not limited to, sodium chloride and sodium sulfate);

      (2)   Excessive discoloration (such as, but not limited to, dye wastes and vegetable tanning solutions);

      (3)   Unusual BOD, chemical oxygen demand or chlorine requirements in the quantities as to constitute a significant load on the sewage treatment works; and

      (4)   Unusual volume of flow or concentration of wastes constituting “slugs” as defined herein.

   (J)   Waters or wastes containing substances which are not amenable to treatment or reduction by the sewage treatment processes employed, or are amenable to treatment only to the degree that the sewage treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.

(Ord. 304, passed 4-7-1975) Penalty, see § 51.999

§ 51.089 REQUIREMENTS FOR DISCHARGE OF SPECIAL WASTES.

   (A)   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 § 51.088, and which in the judgment of the Inspector 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 Inspector 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; and/or

      (4)   Require payment to cover the added cost of handling and treating the wastes not covered by existing taxes or sewer charges under the provisions of § 51.094.

   (B)   If the Inspector permits the pretreatment or equalization of waste flows, the design and installation of the plants and equipment shall be subject to the review and approval of the Inspector and subject to the requirements of all applicable codes, ordinances and laws.

(Ord. 304, passed 4-7-1975)

§ 51.090 INTERCEPTORS.

   Grease, oil and sand interceptors shall be provided when, in the opinion of the Inspector, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts, or any flammable wastes, sand or other harmful ingredients; except, that the interceptors shall not be required for private living quarters or dwelling units. All interceptors shall be of a type and capacity approved by the Inspector and shall be located as to be readily and easily accessible for cleaning and inspection.

(Ord. 304, passed 4-7-1975)

§ 51.091 PRETREATMENT OR FLOW EQUALIZATION.

   Where preliminary treatment or flow-equalizing facilities are provided for any waters or wastes, they shall be maintained continuously in satisfactory and effective operation by the owner at his or her expense.

(Ord. 304, passed 4-7-1975)

§ 51.092 MANHOLES.

   When required by the Inspector, the owner of any property serviced by a building sewer carrying industrial wastes shall install a suitable control manhole together with the necessary meters and other appurtenances in the building sewer to facilitate observation, sampling and measurement of the wastes. The manhole, when required, shall be accessibly and safely located and shall be constructed in accordance with plans approved by the Inspector. The manhole shall be installed by the owner at his or her expense and shall be maintained by him or her so as to be safe and accessible at all times.

(Ord. 304, passed 4-7-1975)

§ 51.093 SAMPLING AND TESTING.

   All measurements, tests and analysis of the characteristics of waters and wastes to which reference is made in this chapter shall be determined in accordance with the latest edition of Standard Methods for the Examination of Water and Wastewater, published by the American Public Health Association, and shall be determined at the control manhole provided, or upon suitable samples taken at the control manhole. In the event that no special manhole has been required, the control manhole shall be considered to be the nearest downstream manhole in the public sewer to the point at which the building sewer is connected. Sampling shall be carried out by customarily accepted methods to reflect the effect of constituents upon the sewage works and to determine the existence of hazards to life, limb and property. (The particular analyses involved will determine whether a 24-hour composite of all outfalls of a premises is appropriate or whether a grab sample or samples should be taken. Normally, but not always, BOD and suspended solids analyses are obtained from 24-hour composites of all outfalls, whereas pH’s are determined from periodic grab samples.)

(Ord. 304, passed 4-7-1975)

§ 51.094 SPECIAL ARRANGEMENTS.

   No statement contained in this chapter shall be construed 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, subject to payment therefore by the industrial concern.

(Ord. 304, passed 4-7-1975)

PROTECTION FROM DAMAGE