The following described substances, materials, waters, or wastes shall be limited in discharges to the wastewater treatment works to concentrations or quantities which will not harm the wastewater treatment works, process or equipment, will not have an adverse effect on the receiving stream, or will not otherwise endanger life, limb or public property or constitute a nuisance. The Service Director may set limitations more stringent than the limitations established herein if, in his opinion, such more stringent limitations are necessary to meet the above-mentioned objectives. Deliberate dilution with unpolluted water to meet the concentrations established in this chapter shall not be acceptable. In forming his opinion as to the acceptability, the Director will give consideration to such facts as the quantity of subject 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, degree of treatability of the waste in the wastewater treatment plant and other pertinent factors. The limitations or restrictions on materials or characteristics of waste or wastewater discharged to the wastewater treatment works which shall not be violated without approval of the Director are as follows:
(a) Wastewater having a temperature higher than one hundred fifty degrees Fahrenheit (150o);
(b) Wastewater containing more than fifty milligrams per liter of petroleum oils, nonbiodegradable cutting oils, products of mineral oil origin or floatable oils, fat, wax or grease, whether emulsified or not;
(c) Any garbage that has not been properly shredded. Garbage grinders may be connected to sanitary sewers from homes, hotels, institutions, restaurants, hospitals, catering establishments or similar places where garbage originates from the preparation of food in kitchens for the purpose of consumption on the premises or when served by caterers;
(d) 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:
Ag (silver) - 0.2 milligrams per liter (mg/1)
Cd (Cadmium) - 0.2 mg/1
CN (total cyanide) - 0.5 mg/1
Cr + 6 (hexavalent chromium) - 0.25 mg/1
Cr (total Chromium) - 4.2 mg/1
Cu (Copper) - 1.0 mg/1
Fe (Iron) -
Hg (Mercury) - 0.01 mg/1
Ni (Nickel) - 2.0 mg/1
Pb (Lead) - 0.5 mg/1
Phenols - 0.2 mg/1
Zn (Zinc) - 1.0 mg/1
These maximum concentrations may be changed as necessary by the Director or State regulatory agencies, based on new information concerning inhibitory substances or to protect treatment plant processes. Industrial dischargers covered by Federal pretreatment requirements shall meet those limitations specified under the effluent guidelines published pursuant to the Federal Act, or the above concentrations, whichever are more stringent. Major contributing industries discharging incompatible pollutants into the public sewers shall be regulated, in addition, as provided in Section 927.40;
(e) Any waters or wastes containing odor-producing substances exceeding limits which may be established by the Director or any local or State regulatory agencies;
(f) Any radioactive wastes or isotopes of such half-life or concentrations as may exceed limits established by applicable State and/or Federal regulations;
(g) Quantities of flow, concentrations or both which constitute a "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 waters or wastes which, by interaction with other waters or wastes in the public sewer system, release obnoxious gases, or form suspended solids which interfere with the collection system or create a condition deleterious to the wastewater treatment works.
(Ord. 135-1981. Passed 11-30-81.)