The following substances, materials, waters, or wastes shall be limited in discharges to the wastewater treatment facilities to concentrations or quantities which will not harm either sewers or the treatment facilities’ treatment process or equipment; will not have an adverse effect on the receiving stream and/or soil, vegetation, and ground water; or will not otherwise endanger life, limb, or public property or constitute a nuisance. The city may set limitations lower than limitations established in the regulations below if, in its opinion, such more severe limitations are necessary to meet the above objectives. In forming its opinion as to the acceptability of wastes, the city will give consideration to such factors as the quantity of subject waste in reaction to flows and velocities in the sewers, materials of construction of the sewers, nature of the wastewater treatment process, the city’s NPDES and/or SDS permit, capacity of the treatment plant, degree of treatability of wastes in the 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 Wastewater System Operator are as follows:
(A) Any wastewater having a temperature greater than 150°F (65.6°C), or causing, individually or in combination with other wastewater, the influent at the treatment facilities to have a temperature exceeding 104°F (40°C), or having heat in amounts which will inhibit biological activity in the treatment facilities resulting in interference therein.
(B) Any wastewater containing fats, wax, grease, or oils, whether emulsified or not, in excess of 100 mg/l or containing substances which may solidify or become viscous at temperatures between 32°F and 150°F (0° and 65.6°C); and any wastewater containing oil and grease concentrations of mineral origin of greater than 100 mg/l, whether emulsified or not.
(C) Any quantities of flow, concentrations, or both which constitute a “slug” as defined herein.
(D) A discharge of water or wastewater which in concentration or in quantity of flow exceeds for any period of duration longer than 15 minutes more than five times the average 24-hour concentration of flows during normal operation.
(E) Any garbage not properly shredded, as defined in § 51.01. 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 on the premises or when served by caterers.
(F) Any noxious or malodorous liquids, gases, or solids which either alone or by interaction with other wastes are capable of creating a public nuisance or hazard to life, or are sufficient to prevent entry into the sewers for their maintenance and repair.
(G) Any wastewater with objectionable color not removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions.
(H) Non-contact cooling water or unpolluted storm, drainage, or ground water.
(I) Wastewater containing 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 and sodium sulfate) in such quantities that would cause disruption of the wastewater treatment facilities.
(J) Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the Wastewater System Operator in compliance with applicable state or federal regulations.
(K) Any waters or wastes containing arsenic, total chromium, copper, zinc, cadmium, cyanide, lead, mercury, nickel, silver, and similar objectionable or toxic substances to such degree that any such material received in the composite wastewater at the treatment works exceeds the limits established by the Wastewater System Operator for such materials.
(L) Any waters or wastes containing BOD5 or suspended solids of such character and quantity that unusual attention or expense is required to handle such materials at the treatment facilities, except as may be permitted by specific written agreement subject to the provisions of § 51.44.
(M) Waters or wastes containing substances which are not amenable to treatment or reduction by the wastewater treatment process employed, or are amenable to treatment only to such degree that the effluent cannot meet the requirements or otherwise causes a violation of any statute, rule, regulation, or ordinance of any regulatory agency or state or federal regulatory body having jurisdiction over discharge into the receiving waters.
(Ord. 89, passed 11-22-94) Penalty, see § 51.99