§ 51.25  PRETREATMENT OF WASTEWATER.
   (A)   Pretreatment facilities.  Users shall provide wastewater treatment as necessary to comply with this subchapter and shall achieve compliance with prohibitions set out in § 51.24 of this subchapter within the time limitations specified by the Director of Public Works. Any facilities necessary for compliance shall be provided, operated, and maintained at the user's expense. Detailed plans describing such facilities and operating procedures shall be submitted to the Director of Public Works for review, and shall be acceptable to the Director of Public Works before such facilities are constructed. The review of such plans and operating procedures shall in no way relieve the user from the responsibility of modifying such facilities as necessary to produce a discharge acceptable to the city under the provisions of this subchapter.
   (B)   Additional pretreatment measures.
      (1)   Whenever deemed necessary, the Director of Public Works may require users to restrict their discharge during peak flow periods, designate that certain wastewater be discharged only into specific sewers, relocate and/or consolidate points of discharge, separate sewage waste streams from industrial waste streams, and such other conditions as may be necessary to protect the POTW and determine the user's compliance with the requirements of this subchapter.
      (2)   The Director of Public Works may require any person discharging into the POTW to install and maintain, on their property and at their expense, a suitable storage and flow-control facility to ensure equalization of flow. A wastewater discharge permit may be issued solely for flow equalization.
      (3)   Grease, oil, and sand interceptors shall be provided when, in the opinion of the Director of Public Works, they are necessary for the proper handling of wastewater containing excessive amounts of grease and oil, or sand; except that such interceptors shall not be required for residential users. All interception units shall be of type and capacity approved by the Director of Public Works and shall be so located to be easily accessible for cleaning and inspection. Such interceptors shall be inspected, cleaned, and repaired regularly, as needed, by the user at their expense.
      (4)   Users with the potential to discharge flammable substances may be required to install and maintain an approved combustible gas detection meter.
   (C)   Accidental discharge/sludge control plans.  At least once every two years, the Director of Public Works shall evaluate whether each significant industrial user needs an accidental discharge/sludge control plan. The Director of Public Works may require any user to develop, submit for approval, and implement such a plan. Alternatively, the Director of Public Works may develop such a plan for any user. An accidental discharge/sludge control plan shall address, at a minimum, the following:
      (1)   Description of discharge practices, including nonroutine batch discharges;
      (2)   Description of stored chemicals;
      (3)   Procedures for immediately notifying the Director of Public Works and POTW Supervisor of any accidental or sludge discharge, as required by § 51.28 of this subchapter; and
      (4)   Procedures to prevent adverse impact from any accidental or sludge discharge. Such procedures include, but are not limited to, inspection and maintenance of storage areas, handling and transfer of materials, loading and unloading operations, control of plant site runoff, worker training, building of containment structures or equipment, measures for containing toxic organic pollutants, including solvents, and/or measures and equipment for emergency response.
(Ord. 95-05, passed 4-10-95)