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not be discharged into the sewer system except where present ,in contaminated groundwater discharges being discharged under an exceptional waste permit issued by the City. Where groundwater discharges contain such contaminants, the discharger shall monitor the sewer atmosphere for explosivity and flammability using a properly calibrated meter designed for the purpose. The frequency of such monitoring shall be defined in the permit. Whenever a lower explosive level is threatened to be exceeded, the discharger shall immediately notify the City Engineer of the potential hazard in the sewer within fifteen minutes of making the determination of threatened explosivity. The discharger shall follow verbal notification with a written explanation of the cause of the explosive hazard within five working days, with corrective actions taken to alleviate the situation and measures taken to prevent a reoccurrence. The discharger shall not recommence discharges without prior written approval of the City Engineer or his designated representative. Where flammable substances are used in processes,' separate collection and disposal outside the sewer system shall be provided. (e) Grease and Oil . Grease and/or oil shall not be discharged into the sewer system if the average concentration of floatable oil and/or grease (defined as that which is subject to gravity separation at a temperature of twenty degrees Celsius and at a pH of 4.5) exceeds twenty mg/liter; nor shall the total and/or grease concentration exceed two hundred mg/liter. In addition, the discharge of petroleum oil, nonbiodegradable cutting oil, or products of mineral origin in amounts that cause interference or pass through, as defined by EPA regulations, shall be prohibited. (g) Noxious, Hazardous or Malodorous Substances. No industrial waste shall be discharged which alone or in combination with other wastes may create a public nuisance, hazard, make human entry into the sewers abnormally hazardous, or which constitutes a discharge of hazardous substances as defined by Title 22, Part II of the California Code of Regulations; or statutes of the United States government. Dischargers shall be required to certify at least every six months that their waste does not constitute a hazardous waste, as defined by EPA regulations, and that during the previous six months no discharge of hazardous substances or waste has occurred. Should any discharge of a hazardous waste occur, the discharger - 5 -