13.06.050  General Sewer Use Requirements -- Prohibited Discharges
   A.   General Prohibitions. No non-domestic user shall introduce or cause to be introduced into the POTW any pollutant or industrial wastewater which causes pass through or interference. These general prohibitions apply to all non-domestic users of the POTW whether or not they are subject to categorical pretreatment standards or any other National, State, or local pretreatment standards or requirements.
   B.   Specific Prohibitions. No user shall introduce or cause to be introduced into the POTW the following pollutants, substances, or industrial wastewater described below, nor shall such pollutants, substances, or industrial wastewater be processed or stored in such a manner that they could be discharged to the POTW:
      1.   Pollutants which create a fire or explosive hazard in the POTW, including, but not limited to, wastestreams with a closed-cup flashpoint of less than 140ºF (60ºC) using the test methods specified in 40 CFR 261.21;
      2.   Industrial wastewater having a pH less than 6.0 or more than 8.5, or otherwise causing corrosive structural damage to the POTW or equipment;
      3.   Solid or viscous substances in amounts which will cause obstruction of the flow in the POTW resulting in interference, but in no case solids greater than one and one-half inches (1.5") in any dimension;
      4.   Pollutants, including oxygen-demanding pollutant (BOD5> 300 mg/l, 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;
      5.   Industrial wastewater having a temperature greater than 150ºF, or which will inhibit biological activity in the treatment plant resulting in interference, but in no case industrial wastewater which causes the temperature at the introduction into the treatment plant to exceed 104ºF;
      6.   Petroleum oil, nonbiodegradable cutting oil, or products of mineral oil origin, in amounts that will cause interference or pass through;
      7.   Pollutants which result in the presence of toxic gases, vapors, or fumes within the POTW in a quantity that may cause acute worker health and safety problems;
      8.   Trucked or hauled pollutants, except at discharge points designated by the Director of Public Works in accordance with this chapter;
      9.   Noxious or malodorous liquids, gases, solids, or other industrial wastewater which, either singly or by interaction with other wastes, are sufficient to create a public nuisance or a hazard to life, or to prevent entry into the sewers for maintenance or repair;
      10.   Industrial wastewater which imparts color which cannot be removed by the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions, which consequently imparts color to the treatment plant's effluent, thereby violating the City's Waste Discharge permit;
      11.   Industrial wastewater containing any radioactive wastes or isotopes except in compliance with applicable State or Federal regulations;
      12.   Storm water, surface water, ground water, artesian well water, roof runoff, subsurface drainage, swimming pool drainage, condensate, deionized water, noncontact cooling water, and unpolluted wastewater, unless specifically authorized by the Director of Public Works;
      13.   Sludges, screenings, or other residues from the pretreatment of industrial wastes;
      14.   Medical wastes, except as specifically authorized by the Director of Public Works in an industrial wastewater discharge permit;
      15.   Industrial wastewater causing, alone or in conjunction with other sources, the treatment plant's treated wastewater to fail a toxicity test;
      16.   Detergents, surface-active agents, or other substances which may cause excessive foaming in the POTW;
      17.   Fats, oils, or greases of animal or vegetable origin in concentrations greater than 100 mg/1;
      18.   Total Suspended Solids concentrations greater than 200 mg/l.
      19.   Specific Conductivity greater than 200 micromhos/cm above source water levels.
      20.   Industrial wastewater causing two readings on an explosion hazard meter at the point of discharge into the POTW, or at any point in the POTW, of more than five percent (5%) or any single reading over ten percent (10%) of the Lower Explosive Limit of the meter.