(A) 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 authorized city representative that such 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 the authorized representative’s opinion as to the acceptability of these wastes, the authorized representative will give consideration to such factors as the quantities of subject wastes in relation to flows and velocities in sewers, materials of construction of the sewers, nature of the sewage treatment process, capacity of the wastewater treatment works, degree of treatability of wastes in the wastewater treatment works and maximum limits established by regulatory agencies.
(B) The substances prohibited are:
(1) High temperatures. Any liquid or vapor having a temperature higher than 150°F (65°C);
(2) Oily/toxic wastes. Any waters or wastes containing toxic or poisonous materials; 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;
(3) Garbage. Any garbage that has been properly shredded. The installation and operation of a garbage grinder equipped with a motor of three-fourths horsepower or greater shall be subject to the review and approval of authorized city representative;
(4) Acids. Any waters or wastes containing strong acid, iron pickling waste or concentrated plating solutions, whether neutralized or not;
(5) Plant design limit. Any waters or wastes containing iron, chromium, copper, zinc or similar objectionable or toxic substances; or wastes exerting an excessive chlorine requirement, to such degree that any such materials received in the composite sewage at the sewage treatment works exceeds the limits established by the authorized city representative for such materials;
(6) Odor or taste. Any waters or wastes containing phenols or other taste or odor-producing substances in such concentrations exceeding limits which may be established by the authorized city representative as necessary after treatment of the composite sewage, to meet the requirements of the state, federal and other public agencies of jurisdiction for such discharge into the receiving waters;
(7) Radioactive wastes. Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the authorized city representative in compliance with applicable state or federal regulations;
(8) Excess pH. Any waters or wastes having a pH in excess of 9.5;
(9) Mercury. Any mercury or any of its compounds in excess of 0.0005 mg/l as Hg at any time, except as permitted by the authorized city representative in compliance with applicable state or federal regulations;
(10) Cyanide. Any cyanide in excess of 0.025 mg/l at any time, except as permitted by the authorized city representative in compliance with applicable state and federal regulations;
(11) Other. Materials which exert or cause:
(a) 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);
(b) Excessive discoloration (such as, but not limited to, dye wastes and vegetable tanning solution);
(c) Unusual BOD, chemical oxygen demand or chlorine requirements in such quantities as to constitute a significant load on the sewage treatment works; and/or
(d) Unusual volume of flow or concentration of wastes constituting “slugs”, as defined herein.
(12) Untreatable waste. 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 such degree that the wastewater treatment works effluent cannot meet the requirements of agencies having jurisdiction over discharge to the receiving waters; and
(13) Excessive load.
(a) Any waters or wastes shall be subject to the review of the authorized city representative having:
1. A five-day BOD greater than 300 parts per million by weight;
2. Containing more than 350 parts per million by weight of suspended solids;
3. Having an average daily flow greater than 2% of the average sewage flow of the city; or
4. Having wastewater concentrations greater than normal as determined by sampling and testing of a user’s wastewater discharge.
(b) Where necessary in the opinion of the authorized city representative, the owner shall provide, at the owner’s expense, such preliminary treatment as may be necessary to:
1. Reduce the biochemical oxygen demand to 300 parts per million by weight;
2. Reduce the suspended solids to 350 parts per million by weight; or
3. Control the quantities and rates of discharge of such waters or wastes.
(c) Plans, specifications and any other pertinent information relating to proposed preliminary treatment facilities shall be submitted for the approval of the authorized city representative and no construction of such facilities shall be commenced until said approvals are obtained in writing.
(2011 Code, § 24.0404) Penalty, see § 52.999