(A) The following described substances, materials, water or wastes shall be limited in discharges to municipal systems to concentrations or quantities which will not harm either sewers, the wastewater
treatment works, treatment process or equipment, will not have an adverse effect on the receiving stream and soil, vegetation and ground water, or will not otherwise endanger lives, limb, public property, or constitute a nuisance. The Administrator may set limitations lower than limitations established in the regulations below if, in his opinion, such more severe limitations are necessary to meet the above objectives. In forming his opinion as to the acceptability of wastes, the Administrator 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 sewage treatment process, the city's NPDES/SDS permit, capacity of the sewage treatment plant, degree of treatability of wastes in the sewage 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 Administrator are as follows:
(1) 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 wastewater treatment plant to have a temperature exceeding 104° F (40° C), or having heat in amounts which will inhibit biological activity in the wastewater treatment works resulting in interference therein.
(2) Any wastewater containing oil and grease concentrations of mineral origin of greater than 100 mg/l, whether emulsified or not.
(3) Any quantities of flow, concentrations, or both which constitute a "slug" as defined in § 51.001.
(4) Any garbage not properly shredded, as defined in § 51.001 of this chapter. 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.
(5) Any noxious or malodorous liquids, gases or solids which either singly 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.
(6) Any wastewater with objectionable color not removed in the treatment process such as but not limited to dye wastes and vegetable tanning solutions.
(7) Non-contact cooling water or unpolluted storm, drainage or ground water.
(8) Wastewater 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 such quantities that would cause disruption with the wastewater disposal system.
(9) Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the Administrator in compliance with applicable state or federal regulations.
(10) Any waters or wastes containing the following substances to such degree that any such material received in the composite wastewater at the wastewater treatment works in excess of the following limits for such materials:
1 mg/l arsenic
1 mg/l cadmium
2 mg/l copper
1 mg/l cyanide
1 mg/l lead
1 mg/l mercury
1 mg/l nickel
1 mg/l silver
10 mg/l total chromium
1 mg/l zinc
12 mg/l phenolic compounds which cannot be removed by the city's wastewater treatment system.
(11) Any wastewater which creates conditions at or near the wastewater disposal system which violates any statute, rule, regulation or ordinance of any regulatory agency, or state or federal regulatory body.
(12) Any waters or wastes containing an average BOD5 concentration greater than 300 mg/l, except as may be permitted by a user agreement subject to the provisions of § 51.094.
(13) Any waters or wastes containing an average suspended solids concentration greater than 350 mg/l, except as may be permitted by a user agreement subject to the provisions of § 51.094.
(14) Any waters or wastes containing an average ammonia-nitrogen concentration greater than 35 mg/l, except as may be permitted by a user agreement subject to the provisions of § 51.094.
(15) Any wastewater containing fats, wax, grease, or oils, whether emulsified or not, in excess of 100 mg/1, or containing substances which may solidify or become viscous at temperatures between 32° F and 150° F (0° C and 65.6° C), except as may be permitted by a user agreement subject to the provisions of § 51.094.
(16) Any waters or wastes of such a character or quantity that unusual attention or expense is required to handle such materials at the wastewater treatment works, except as may be permitted by a user agreement subject to the provisions of § 51.094.
(17) Any waters or wastes containing an average total phosphorus concentration greater than 8 mg/1, except as may be permitted by a user agreement subject to the provisions of § 51.094.
(Ord. 744, passed 11-27-89; Am. Ord. 927, passed 11-26-01)