(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