The following described substances, materials, waters or waste shall be limited in discharges to municipal systems to concentrations or quantities which will not violate design criteria or harm either the sewers, waste water 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 approving authority may set limitations lower than the limitations established in the regulations below if in its opinion the more severe limitations are necessary to meet the above objectives. In forming the opinion as to the acceptability, the approving authority will give consideration to the factors 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, capacity of the waste water treatment plant, degree of treatability of the waste in the waste water treatment plant, limitations set forth in the city’s NPDES permit and other pertinent factors. The limitations or restrictions on materials or characteristics of waste or waste water discharged to the sanitary sewer which shall not be violated without approval of the approving authority are as follows:
(A) Waste water having a temperature higher than 150°F (65°C);
(B) Waste water containing more than 25 milligrams per liter of petroleum oil, nonbiodegradable cutting oils or product of mineral oil origin, or containing substances that may solidify or become viscous at temperatures between 32°F and 150°F (0°C and 65.6°C);
(C) Waste water from industrial plants containing floatable oil, fat or grease, in excess of concentrations permitted by the approving authority;
(D) 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 consumption elsewhere when served by caterers;
(E) Any waters or wastes containing iron, chromium, copper, zinc and similar objectionable or toxic substances to the degree that any such material received in the composite waste water at the waste water treatment works exceeds the limits established by the approving authority for the materials;
(F) Any waters or wastes containing odor-producing substances exceeding limits which may be established by the approving authority;
(G) Any radioactive materials of the half-life or concentration as may exceed limits established by the approving authority or applicable state and federal regulations;
(H) Quantities of flow, concentrations or both which constitute a “slug”, as defined in this chapter;
(I) 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;
(J) Any waste water with objectionable color not removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions;
(K) Waste water containing inert suspended solids (such as, but not limited to, Fullers earth, lime slurries and lime residues), or of dissolved solids (such as but not limited to sodium chloride and sodium sulfate) in the quantities that would cause disruption with the waste water disposal system; and
(L) Any waters or wastes containing BOD or suspended solids of the character and quantity that unusual attention or expense is required to handle the materials at the waste water treatment works, except as may be permitted by specific written agreement subject to the provisions of this subchapter.
(Ord. 201, passed 12-7-1988)