The following described substances, materials, waters or waste shall be limited in discharges to sanitary sewerage systems to concentrations or quantities which will not harm either the sewers, waste water treatment process or equipment, will not otherwise endanger lives, limb, public property or constitute a nuisance. The City, acting through its Engineer, may set limitations lower than the limitations established in the Title below if, in his opinion, more severe limitations are necessary to meet the above objectives. Deliberate dilution with unpolluted water to meet the concentrations established in this Title shall not be acceptable. In forming his opinion as to the acceptability, the Engineer 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 waste water treatment process employed, the capacity of the waste water treatment plant, the degree of treatability of the waste in the waste water treatment plant, and other pertinent factors. The limitations or restrictions on materials or characteristics of waste or waste water discharged to the sanitary newer which shall not be violated without approval of the Engineer are as follows:
(a) Waste water having a temperature higher than one hundred and fifty degrees Fahrenheit (65 degrees Centigrade) or lower than thirty-two degrees Fahrenheit (O degrees Centigrade).
(b) Waste water containing more than fifty (50) milligrams per liter of petroleum oil, nonbiodegradable cutting oils, product of mineral oil origin or floatable oils, fat, wax or grease.
(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 waste water treatment process, constitute a hazard to humans or animals, create a public nuisance, or create any hazard in the receiving waters of the Waste Water 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 concentration shall not be exceeded in industrial wastes discharged to the public sewers:
Arsenic | 0.05 | mg/l |
Barium | 1.0 | mg/l |
Boron | 5.0 | mg/l |
Cadmium +3 | 0.05 | mg/l |
Chromium+6 | 0.5 | mg/l |
Chromium | 0.5 | mg/l |
Cobalt | 1.0 | mg/l |
Copper | 0.5 | mg/l |
Cyanide (HCN) | 0.1 | mg/l |
Fluoride | 5.0 | mg/l |
Iron | 5.0 | mg/l |
Lead | 0.5 | mg/l |
Mercury | 0.002 | mg/l |
Molybdenum | 5.0 | mg/l |
Nickel | 2.0 | mg/l |
Phenols | 5.0 | mg/l |
Selenium | 0.01 | mg/l |
Silver | 0.03 | mg/l |
Sulfides | 50.0 | mg/l |
Total Dissolved Solids | 1,500.0 | mg/l |
Tungsten | 5.0 | mg/l |
Zinc | 2.0 | mg/l |
Any toxic substance as defined in the Federal Register, Volume 38, published September 7, 1973, shall not be discharged into the sanitary sewer system in concentrations which exceed 0.1 of the ninety-six hour median tolerance limit.
(e) Any waters or wastes containing odor-producing substances exceeding limits which may be established by the Engineer or any appropriate 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 a "slug" as defined herein.
(h) Waters or wastes containing substances which are not amenable to treatment or reduction by the waste water treatment processes employed, or are amenable only to such degree that the waste water 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, form suspended solids which interfere with the collection system, or create a condition deleterious to structures and treatment processes.
These maximum concentrations may be changed as necessary by the City acting through its Engineer or State and/or Federal 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 under Section 304(b) and 307(b) of the Federal Act or the above concentration, whichever is more stringent. Major contributing industries discharging incompatible pollutants into the public sewers shall be regulated as provided in Section 919.05.
(Ord. 5476-84. Passed 6-4-84.)