§ 51.113 SUBSTANCES WHICH MAY BE PROHIBITED FROM PUBLIC SEWERS.

   (A)   (1)   No person shall discharge or cause to be discharged the following described substances, materials, waters or wastes if it appears in the opinion of the Director of Public Works that such wastes can harm 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.

      (2)   In forming its opinion as to the acceptability of these wastes, the city will give consideration to such 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 treatability of wastes in the sewage treatment plant, and other pertinent factors.

   (B)   The substances prohibited are:

      (1)   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 or 0°C and 65°C;

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

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

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

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

      (6)   Materials which exert or cause:

         (a)   Unusual concentration 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 sulfate);

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

         (c)   Unusual BOD, COD or chlorine requirements in such quantities as to constitute a significant load on the sewage treatment works; or

         (d)   Unusual volume of flow or concentration of wastes causing interference in process or operations constituting slugs.

(Prior Code, § 51.113) (Ord. 2270, passed 6-17-1972; Ord. 2535, passed 12-5-1977; Ord. 03-39, passed 11-17-2003) Penalty, see § 51.999

§ 51.114 DILUTION.

   The admission into the public sewers of any waters or wastes in volumes, or with constituents, such that existing dilution conditions in the sewers or at the treatment facility would be adversely affected, shall be subject to review and approval of the Director of Public Works. Where necessary, in the opinion of the Director, pretreatment or equalizing units may be required to bring constituents or volume of flow within an acceptable level, and to hold or equalize flows so that no peak flow conditions may hamper the operation of any unit of the sewer system. The equalization or holding unit shall have a capacity suitable to serve its intended purpose and be equipped with acceptable outlet control facilities to provide flexibility in operation and accommodate changing conditions in the waste flow.

(Prior Code, § 51.114) Penalty, see § 51.999

§ 51.115 DELETERIOUS DISCHARGES.

   (A)   If any waters or wastes are discharged, or are proposed to be discharged to the public sewers, which contain substances or possess the characteristics enumerated in the preceding sections of this subchapter, and which in the judgment of the City Engineer, Public Works Director or Chief Building and Code Inspector or the local, state and federal agencies having jurisdiction, may have a deleterious effect upon the wastewater treatment processes, equipment or receiving waters, or which otherwise create a hazard to life or constitute a public nuisance, the Director of Public Works 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

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

   (B)   In forming an opinion as to the acceptability of wastes, the Director of Public Works will give consideration to such 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 wastewater treatment process, capacity of the wastewater treatment facility, degree of treatability of wastes in the wastewater treatment facility and other pertinent factors. Any waters or wastes having a BOD5 concentration greater than 250 mg/l or a suspended solids concentration greater than 250 mg/l or an average daily flow greater than 2% of the average total waste flow of the city shall be subject to the review of the Director of Public Works.

   (C)   If the Director of Public Works 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 City Engineer, Chief Building and Code Inspector or Director of Public Works, and the local, state and federal agencies having jurisdiction and subject to the requirements of all applicable codes, resolutions and laws. See § 51.132 of this code.

   (D)   In the event of an accidental spill or unavoidable loss to the drains of any deleterious materials, the owner shall promptly notify the Director of Public Works of the nature of the spill, the quantity and time of occurrence.

(Prior Code, § 51.115) (Ord. 03-39, passed 11-17-2003) Penalty, see § 51.999

§ 51.116 WASTES FROM GARBAGE SHREDDERS.

   (A)   No person shall install and operate any garbage shredder equipped with a motor of three-fourths horsepower (seventy-six hundredths metric) or greater in size.

   (B)   No commercial/industrial establishment shall install any garbage shredder or replace an existing garbage shredder.

   (C)   All garbage shredders shall shred the waste to a degree that all particles will be carried freely under normal flow conditions prevailing in the public sewer system. Garbage shredders shall not be used for grinding plastic, paper products, inert materials or garden refuse.

(Prior Code, § 51.116) Penalty, see § 51.999

§ 51.117 GREASE, OIL AND SAND TRAPS.

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

(Prior Code, § 51.117) (Ord. 03-39, passed 11-17-2003) Penalty, see § 51.999

§ 51.118 UNLAWFUL USE OF MANHOLES.

   (A)   Opening or entering manholes or inlets for any purpose whatever is strictly prohibited, except by persons duly authorized to do so.

   (B)   No person shall discharge any substance directly into a manhole, inlet or other opening in the public sewers other than through an approved building sewer, unless upon written application to the Director of Public Works and payment of the applicable user charges and fees, and the Director of Public Works issues a permit for such direct discharges.

(Prior Code, § 51.118) Penalty, see § 51.999

INDUSTRIAL WASTES AND DISCHARGE PERMITS

§ 51.130 MAJOR CONTRIBUTING INDUSTRIES.

   All major contributing industries proposing to directly or indirectly connect to or discharge wastes into the sanitary sewers shall obtain a state indirect discharge (SID) permit from the state before connecting to or discharging into these sewers.

(Prior Code, § 51.130) Penalty, see § 51.999

§ 51.131 INDUSTRIAL WASTES; REQUIREMENTS.

   Persons proposing to or who actually discharge industrial wastes which contain none of the prohibited ingredients or characteristics set forth in §§ 51.110 through 51.118 of this code, other than excessive concentrations of BOD5, suspended solids and grease, hydrogen sulfide or ammonia shall be required to pretreat their wastes to meet the requirements of normal strength wastewater with the exception that wastes may be accepted for treatment if all the following requirements are met:

   (A)   The wastes will not cause damage to the sanitary sewer system;

   (B)   The wastes will not impair the wastewater treatment process; and

   (C)   The discharger of the waste agrees to pay a surcharge over and above the published sewer rates when the waste strength exceeds that of normal strength wastewater.

(Prior Code, § 51.131) Penalty, see § 51.999