(A) The following described substances, materials, water or waste shall be limited in discharges to municipal systems to concentrations or quantities which will not harm either the sewers, 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. 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. In forming his or her opinion as to the acceptability, the Superintendent will give consideration to such factors 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.
(B) The limitations or restrictions on materials or characteristics of waste or wastewaters discharged to the sanitary sewer which shall not be violated without approval of the Superintendent are as follows:
(1) Wastewater having a temperature higher than 150°F (65°C);
(2) Wastewater containing more than 25 milligrams per liter of petroleum oil, non-biodegradable cutting oils or product of mineral oil origin;
(3) Wastewater from industrial plants containing floatable oils, fat or grease;
(4) 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;
(5) Any waters or wastes containing iron, chromium, copper, zinc and similar objectionable or toxic substances to such degree that any such material received in the composite wastewater at the sewage treatment works exceeds the limits established by the Superintendent for such materials;
(6) Any waters or wastes containing odor-producing substances exceeding limits which may be established by the Superintendent;
(7) Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the Superintendent in compliance with applicable state or federal regulations;
(8) Quantities of flow, concentrations or both which constitute a “slug”, as defined herein;
(9) Materials which exert or cause:
(a) Unusual concentrations of inert suspended solids (such as, but not limited to, Fuller’s earth, lime slurries and lime residues) or of dissolved solids, (such as but not limited to, sodium chloride or sodium sulfate);
(b) Excessive discoloration (such as, but not limited to, dye wastes and vegetable tanning solutions);
(c) Unusual BOD, chemical oxygen demand or chlorine requirements in such quantities as to constitute a significant load on the sewage treatment works; and
(d) Unusual volume of flow or concentration of wastes constituting “slugs”, as defined herein.
(10) Waters or wastes containing substances which are not amenable to treatment or reduction by the wastewater treatment processes employed, or are amenable to treatment 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; and
(11) Any water or wastes which, by interaction with other water or wastes in the public sewer system, release obnoxious gases, for suspended solids which interfere with the collection system, or create a condition deleterious to structures and treatment processes.
(Prior Code, § 3-226)