(A)   General prohibitions.  No user shall introduce or cause to be introduced into the POTW any pollutant or wastewater which causes pass through or interference.  These general prohibitions apply to all users of the POTW.
   (B)   Specific prohibitions.
      (1)   No user shall introduce or cause to be introduced into the POTW the following pollutants, substances, or wastewater:
         (a)   Pollutants which create a fire or explosive hazard in the POTW, including, but not limited to, waste streams with a closed-cup flashpoint of less than 140°F (60°C) using the test methods specified in 40 CFR 261.21;
         (b)   Wastewater having a pH less than 6.0 or higher than 11.0, or otherwise causing corrosive structural damage to the POTW or equipment;
         (c)   Any liquid or water having a temperature higher than 104°F.
         (d)   Any radioactive wastes or isotopes.
         (e)   Any noxious or malodorous liquids, gases, or solids sufficient to create a public nuisance or hazard.
         (f)   Any water or waste containing suspended solids, viscous substances or soluble solids of such character and quality that unusual attention or expense is required to prevent obstruction of flow in the POTW or to handle such materials in the POTW.
         (g)   Any pollutants or wastes containing a toxic or poisonous substance in sufficient quantity resulting in the presence of toxic gases, vapors or fumes to interfere with any sewage treatment process, constitute a hazard or create a hazard, such as acute worker health and safety problems.
         (h)   Any substance which will cause damage or imbalance of any portion of the treatment sludge disposal process.
         (i)   Any substance which will cause the POTW to violate any state receiving water quality standards.
         (j)   Pollutants, including oxygen-demanding pollutants (BOD, etc.), released in a discharge at a flow rate and/or pollutant concentration which, either singly or by interaction with other pollutants, will cause interference with the POTW;
         (k)   Petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin, in amounts that will cause interference or pass through;
         (l)   Sludges, screenings, or other residues from the pretreatment of industrial wastes;
         (m)   Detergents, surface-active agents, or other substances which may cause excessive foaming in the POTW;
         (n)   Storm water, groundwater, street drainage, subsurface drainage or yard drainage shall not be discharged directly or indirectly to the city's POTW. The city may approve the temporary discharge of such water only when no alternate method of disposal is reasonably available.
      (2)   If a temporary permit is granted for the discharge of such water into a tributary sewer, the user shall pay the applicable charges for use and fees, and shall meet such other conditions as required by the city.
   (C)   Dilution.  No user shall ever increase the use of process water, or in any way attempt to dilute a discharge, as a partial or complete substitute for adequate treatment to achieve compliance with a discharge limitation unless expressly authorized by an applicable pretreatment standard or requirement.  The Director of Public Works may impose mass limitations on users who are using dilution to meet applicable pretreatment standards or requirements, or in other cases when the imposition of mass limitations is appropriate.
(Ord. 95-05, passed 4-10-95)