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