(A) The following described substances, materials, waters, or wastes shall be limited in discharges to the city system to concentrations or quantities which will not harm either the sewers or the wastewater treatment process or equipment; will not have an adverse effect on the receiving stream; or will not otherwise endanger lives, limb, public property, or constitute a nuisance.
(B) The city may set limitations lower than the limitations established in the regulations below if in its opinion more severe limitations are necessary to meet the above objectives. Deliberate dilution with unpolluted water to meet the concentrations established in the regulations below shall not be acceptable. In forming its opinion as to the acceptability, the city will give consideration to such facts as the quantity of such waste in relation to flows and velocities in the sewers, materials of construction of the sewers, the wastewater treatment process employed, capacity of the wastewater treatment plant, and other pertinent factors.
(C) The limitations or restrictions on materials or characteristics of waste or water discharged to the sanitary sewer which shall not be violated without approval of the city are as follows:
(1) Wastewater having a temperature higher than 150°F.
(2) Wastewater containing more than 50 milligrams per liter of petroleum oil, non-biodegradable cutting oils, products of mineral oil origin, floatable oils, fat, wax and grease.
(3) Any garbage that has not been properly shredded.
(4) Any waters or wastes containing solids, liquids or gases in sufficient quantity, either singly or by interaction with other wastes, to injure or interfere with any wastewater treatment process, constitute a hazard to humans or animals, create a public nuisance or create any hazard in the receiving waters of the wastewater treatment plant, including but not limited to cyanides, hexavalent chromium, copper, zinc, cadmium, nickel and phenols in the wastes as discharged to the public sewer. The following concentrations shall not be exceeded in industrial wastes discharged to the public sewers:
Total cyanide (NC) | By permit only |
Total cyanide (NC) | By permit only |
Hexavalent chromium | 1.71 mg/l |
Copper | 2.07 mg/l |
Zinc | 1.48 mg/l |
Cadmium | 0.26 mg/l |
Nickel | 1.7 mg/l |
Phenols | 0.2 mg/l |
Lead | 0.43 mg/l |
Mercury | 0.01 mg/l |
Silver | 0.2 mg/l |
Hydrogen sulfide | 10 mg/l |
Sulfur dioxide gas | 5 mg/l |
(D) These maximum concentrations may be changed as necessary by the city or state regulatory agencies based on new information concerning inhibitory substances or to protect treatment plant processes. Industrial discharges covered by federal pretreatment requirements shall meet those limitations specified under effluent guidelines published under Section 304(b) and 307(b) of the Federal Act or the above concentrations, whichever is more stringent. Major contributing industries discharging incompatible pollutants into the public sewers shall be regulated as provided in §§ 51.085 through 51.090. Industrial dischargers must comply with this chapter and Ch. 52. For cases in which different limitations are presented in each chapter, the more stringent shall apply.
(E) Any waters or wastes containing odor-producing substances exceeding limits which may be established by the city or any local or state regulatory agencies.
(F) Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits in compliance with applicable state or federal regulations.
(G) Quantities of flow, concentrations or both which constitute
SLUG as defined herein.
(H) Waters or wastes containing substances which are not amenable to treatment or reduction by the wastewater treatment processes employed, or are amenable only to such degree that the wastewater treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.
(I) Any water or wastes which by interaction with other water or wastes in the public sewer system release noxious gases, form suspended solids which interfere with the collection system or create a condition deleterious to structures and treatment processes.
(1981 Code, § 51.020) (Ord. 6405-90, passed 9-10-1990) Penalty, see § 51.999