A. Pretreatment facilities. Users shall provide wastewater treatment as necessary to comply with this Part and shall achieve compliance with all categorical pretreatment standards, local limits, and the prohibitions set out in § 467-202A of this Part within the time limitations specified by EPA, the state, or the City, whichever is more stringent. 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 City for review, and shall be acceptable to the City 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 Part. The issuance of any permit by the City for pretreatment facilities pursuant to this Part does not constitute an approval of the design of any such pretreatment system. The user remains responsible for the design, construction, operation and maintenance of an acceptable pretreatment facility. The City shall have no responsibility or liability to any user whose system fails for any reason whatsoever to produce a discharge acceptable to the City.
B. Additional pretreatment measures.
(1) Whenever deemed necessary and with reasonable justification, the City 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 Part.
(2) Grease, oil, and sand interceptors shall be provided when 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 City 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. Maintenance records shall be made available to the City upon request.
(3) Users with the potential to discharge flammable substances may be required to install and maintain an approved combustible gas detection meter.
C. Accidental discharge/slug control plans. At least once every two years, the City shall evaluate whether each significant industrial user needs an accidental discharge/slug control plan. The City may require any user to develop, submit for approval, and implement such a plan. Alternatively, the City may develop such a plan for any user. An accidental discharge/ slug control plan shall address, at a minimum, the following:
(1) Description of discharge practices, including nonroutine batch discharges.
(2) Description of stored chemicals that have the reasonable potential to discharge to the POTW.
(3) Procedures for immediately notifying the City of any accidental or slug discharge, as required by § 467-206F of this Part.
(4) Procedures to prevent adverse impact from any accidental or slug 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.
D. Installation of zero-discharge pretreatment system. Prior to installation of a zero-discharge pretreatment system, the user must submit a zero-discharge pretreatment system design plan for City acceptance. In order to obtain City acceptance, the user must demonstrate that he or she will provide full pretreatment of all wastewater and will cease to discharge process wastewater to the facilities by an effective date prescribed by the City and the user must obtain a zero-discharge permit from the City.