Sec. 16-32. Restrictions On Other Discharges:
   (a)   No person shall discharge or cause to be discharged any substances, materials, waters, or wastes if it appears likely in the opinion of the director of public works and engineering or public health authority that such wastes can cause a public nuisance, a menace to the public safety, pollution or contamination of underground or surface waters, or impairs the use of any private sewer, storm drain channel or public or private property.
   (b)   In forming his/her opinion as to the acceptability of certain wastes, the director of public works and engineering or public health authority will consider such factors as the quantities of such wastes in relation to flows and velocities in the sewers, materials of construction of the sewers, nature of the sewage treatment process, capacity of the wastewater facilities, degree of treatability of wastes in the wastewater facilities, and maximum limits established by regulatory agencies.
   (c)   The substances prohibited are:
      (1)   Any liquid or vapor having a temperature higher than one hundred fifty degrees Fahrenheit (150°F) (65°C).
      (2)   Any waters or wastes containing toxic or poisonous materials; or oils, whether emulsified or not, in excess of one hundred milligrams per liter (100 mg/l) or containing substances which may solidify or become viscous at temperatures between thirty two degrees Fahrenheit (32°F) and one hundred fifty degrees Fahrenheit (150°F) (0°C to 65°C).
      (3)   Any waters or wastes containing strong acid, iron pickling wastes, or concentrated plating solution (whether neutralized or not).
      (4)   Any waters or wastes containing iron, chromium, copper, zinc, or similar objectionable or toxic substances; or wastes exerting an excessive chlorine requirement, to such degree that any such material received in the composite sewage at the wastewater treatment works exceeds the limits established by the director of public works and engineering for such materials.
      (5)   Any waters or wastes containing phenols or other taste or odor producing substances, in concentrations exceeding limits established by the director of public works and engineering or any state, federal, or other public agencies having jurisdiction over such discharge to the receiving waters.
      (6)   Any radioactive wastes or isotopes of such half-life or concentration as may exceed limits established by the director of public works and engineering in compliance with applicable state or federal regulations.
      (7)   Any wastes or waters having a pH in excess of 9.5.
      (8)   Any mercury or any of its compounds in excess of 0.0005 milligrams per liter except as permitted by the director of public works and engineering in compliance with applicable state and federal regulations.
      (9)   Any cyanide except as permitted by the director of public works and engineering in compliance with applicable state and federal regulations.
      (10)   Materials which exert or cause:
         (A)   Unusual concentrations of 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);
         (B)   Excessive discoloration (such as, but not limited to, dye wastes and vegetable tanning solutions);
         (C)   Unusual BOD, chemical oxygen demand, or chlorine requirements in such quantities as to constitute a significant load on the sewage treatment works;
         (D)   Unusual volume of flow or concentrations of wastes constituting "slugs" as defined herein.
      (11)   Waters or wastes containing substances which are not amenable to treatment or reduction by the sewage treatment process employed, or are amenable to treatment only to such degree that the sewage treatment plant effluent cannot meet the requirements of agencies having jurisdiction over discharge to the receiving waters.
   The foregoing list is not all inclusive, and the director of public works and engineering may publish new supplements to such list. (Ord. 0-13-51, 11-4-2013)