The following described substances, materials, waters or wastes shall be limited, in discharges to municipal systems, 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 life, limb or public property or constitute a nuisance. The Superintendent may set limitations lower than the limitations established in the regulations below if, in his or her opinion, such 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 his or her opinion as to the acceptability, the Superintendent 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, the capacity of the wastewater treatment plant, the 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 sanitary sewer which shall not be violated without approval of the Superintendent are as follows:
(a) Wastewater having a temperature higher than 150 degrees Fahrenheit.
(b) Wastewater containing more than fifty milligrams per liter of petroleum oil, nonbiodegradable cutting oils, products of mineral oil origin or floatable oils, fat, wax or grease.
(c) 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 wastes discharged to the public sewers:
total cyanide (CN), none permitted
hexavalent chromium, 0.5 mg/l
copper, 0.2 mg/l
zinc, 1.0 mg/l
cadmium, 0.2 mg/l
nickel, 0.2 mg/l
phenols, 0.2 mg/l
lead, 0.5 mg/l
mercury, 0.01 mg/l
silver, 0.2 mg/l
These maximum concentrations may be changed as necessary by the Superintendent or State regulatory agencies, based on current or historical laboratory results or new information concerning inhibitory substances, to meet NPDES limits or to protect treatment plant processes. Industrial discharges covered by Federal pretreatment requirements shall meet those limitations specified under the effluent guidelines published under Title 40 CFR Part 403 of the Federal Act, or the above concentrations, whichever are more stringent. Major contributing industries discharging incompatible pollutants into the public sewers shall be regulated as provided in Section 1040.08.
(d) Any waters or wastes containing odor-producing substances exceeding limits which may be established by the Superintendent or any local or State regulatory agencies.
(e) Any radioactive wastes or isotopes of such half-life or concentrations as may exceed limits in compliance with applicable State or Federal regulations or which may interfere with the efficient processing of wastewater or biosolids.
(f) Quantities of flow, of concentrations or of both which constitute a "slug" as defined herein.
(g) Waters or wastes containing substances which are not amenable to treatment or reduction by the wastewater treatment process employed, or which are amenable only to such a degree that the wastewater treatment plant effluent cannot meet the requirements of other agencies having jurisdiction over discharge to the receiving waters.
(h) Any water or wastes which, by interaction with other water 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.
(Ord. 09-119. Passed 11-17-09.)