(A) The following described substances, materials, water or wastes shall be limited in discharges to city systems to concentrations or quantities which will not harm either the sewers, the wastewater treatment facility treatment process or equipment, will not have an adverse effect on the receiving stream and/or soil, vegetation and groundwater or will not otherwise endanger lives, limb, public property or constitute a nuisance. The Director may set limitations lower than 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 of wastes, the Director 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 wastewater treatment facility, degree of treatability of wastes in the wastewater treatment facility and other pertinent factors. The limitations or restrictions on materials or characteristics of waste or wastewaters discharged to the public sanitary sewer which stall not be violated without approval of the Director 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 facility 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 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 (O°C 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;
(3) Any quantities of flow, concentrations or both which constitute a “slug” as defined in § 53.002;
(4) Any garbage not properly shredded, as defined in §53.002. Garbage grinders may be connected to public 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 water, storm drainage or groundwater;
(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 Director 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 facility in excess of limitations set by the Director for such materials: arsenic; cadmium; copper; cyanide; lead; mercury; nickel; silver; total chromium; zinc; and phenolic compounds which cannot be removed by city’s wastewater treatment facility;
(11) Any wastewater which creates conditions at or near the wastewater treatment facility which violates any statute, rule, regulation or ordinance of any regulatory agency or state or federal regulatory body;
(12) 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 wastewater treatment facility, except as may be permitted by specific written agreement subject to the provisions of § 53.087.
(B) (1) If any waters or wastes are discharged or are proposed to be discharged to the public sanitary sewers which contain substances or possess the characteristics enumerated in division (A) of this section and/or which in the judgment of the Director may have a deleterious effect upon the wastewater treatment facilities, processes or equipment, receiving waters and/or soil, vegetation and groundwater or which otherwise create a hazard to life or constitute a public nuisance, the city may:
(a) Reject the wastes;
(b) Require pretreatment to an acceptable condition for discharge to the public sanitary sewers, pursuant to Section 307(b) of the Act and all addendums thereof;
(c) Require control over the quantities and rates of discharge; and/or
(d) Require payment to cover the added costs of handling, treating and disposing of wastes not covered by existing taxes or sewer service charges.
(2) If the city permits the pretreatment or equalization of waste flows, the design, installation, and maintenance of the facilities and equipment shall be made at the owner’s expense and shall be subject to the review and approval of the city pursuant to the requirements of the MPCA.
(Ord. 409, passed 6-21-2011) Penalty, see § 53.999