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14 <br /> <br />2.5 Special Agreement <br /> <br />The City reserves the right to enter into special agreements with permitted users setting out <br />special terms under which they may discharge to the POTW. In no case will a special <br />agreement waive compliance with a categorical pretreatment standard or federal <br />pretreatment requirement. However, the user may request a net gross adjustment to a <br />categorical standard in accordance with 40 CFR 403.15. They may also request a variance <br />from the categorical pretreatment standard from the Approval Authority in accordance with <br />403.13. <br /> <br />2.6 Dilution <br /> <br /> A user shall not increase the use of process water, or in any way attempt to dilute a <br />discharge, as a partial or complete substitute for adequate treatment to achieve compliance <br />with an applicable pretreatment standard or requirement unless expressly authorized by an <br />applicable pretreatment standard or requirement. The Director may impose mass <br />limitations on users that the Director believes may be using dilution to meet applicable <br />pretreatment standards or requirements, or in other cases when the imposition of mass <br />limitations is appropriate. <br /> <br />2.7 Pretreatment Facilities <br /> <br />A. General: Users shall provide all known, available, and reasonable methods of <br />prevention, control, and treatment (AKART) as required to comply with this <br />ordinance and shall achieve compliance with all applicable pretreatment standards <br />and requirements set out in this ordinance within the time limitations specified by <br />the EPA, the State, or the Director, whichever is more stringent. <br />Any facilities required to pretreat wastewater to a level acceptable to the City shall <br />be provided, operated, and maintained at the user's expense. <br />In addition, the Director may establish Best Management Practices (BMPs) for <br />particular groups of users. These BMPs may include but are not limited to types or <br />methods of pretreatment technology to be used, methods of source control, <br />minimum maintenance requirements, spill prevention, pollution prevention, and <br />housekeeping practices (e.g. in trash enclosures), or other requirements as deemed <br />necessary. <br />B. If a failure to maintain any GRS results in partial or complete blockage of the <br />building sewer, private sewer system discharging to the City Sewer System, or <br />other parts of the City Sewer System, or adversely affects the treatment or <br />transmission capabilities of the POTW, or requires excessive maintenance by the <br />City, or poses a possible health hazard, the discharger responsible for the facilities