(A) The following described substances, materials, water or wastes will 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 waters or soil, vegetation and ground water, or will not otherwise endanger life, limb, public property or constitute a nuisance. The Superintendent may set limitations lower than limitations established in the regulations below if, in the Superintendent’s opinion, much more severe limitations are necessary to meet the above objectives. In forming an opinion as to the acceptability of these wastes, the Engineer and/or 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, nature of the sewage treatment process, the city’s NPDES and/or SDS permit, capacity of the treatment plant, degree of treatability of the wastes in the sewage treatment plant and other factors deemed pertinent.
(B) The limitations or restrictions on materials or characteristics of waste or wastewaters discharged to the sanitary sewer which will not be violated without approval of the Superintendent are as follows:
(1) Any wastewater having a temperature higher than 150°F (65°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 water or waste containing fats, wax, grease, oils, whether emulsified or not, in excess of 10 mg/l or containing substances which may solidify or become viscous at temperatures between 32°F and 150°F (0 - 61°C); and any wastewater containing oil and grease concentrations of mineral origin of greater than 50 mg/l, whether emulsified or not;
(3) Any quantities of flow, concentrations or both, which constitute a “slug”, as defined herein;
(4) Any garbage not 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 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 waters or wastes 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 a half-life or concentration as may exceed limits established by the Superintendent in compliance with applicable state and federal regulations;
(10) Any waters or wastes containing the following substances to a degree that any such material received in the composite wastewater at the wastewater treatment works in excess of limits set by the Superintendent for the materials that cannot be removed by city’s wastewater treatment system:
(a) Arsenic;
(b) Cadmium;
(c) Copper;
(d) Cyanide;
(e) Lead;
(f) Mercury;
(g) Nickel;
(h) Silver;
(i) Total chromium;
(j) Zinc; and
(k) Phenolic compounds.
(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 BOD or suspended solids of a character and quantity that unusual attention or expense is required to handle the materials at the wastewater treatment works, except as may be permitted by specific written agreement subject to the provisions of this chapter; and/or
(13) Any waters or wastes exceeding the following limitations:
(a) BOD: 220 mg/l or 320 lbs/day maximum for any one user;
(b) TSS: 325 mg/l;
(c) Grease/oil: 50 mg/l; and
(d) Flow: 170,000 gpd maximum for any one user.
(Prior Code, § 710.11) (Ord. 2009-04, passed 10-7-2009)