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necessary to accomplish this purpose, and the property owner shall be responsible for carrying out the instructions as the plumbing inspector deems necessary to accomplish this purpose. 1010.08 Types of Wastes Restricted or Prohibited. It shall be unlawful to discharge any wastes or cause or allow any wastes to be discharged into the municipal sanitary sewer system of the City which do not comply with the laws and regulations promulgated by the state or as set forth in this section. Subd. 1 Grease, Oil and Sand. To ensure the proper discharge of waste containing excessive amounts of grease, oil or sand, the City plumbing inspector may require that grease, oil and sand traps or interceptors be provided, which traps or interceptors shall comply in all respects with the requirements set forth in the Minnesota Plumbing Code. Traps or interceptors shall not be required for private dwelling units which discharge only normal wastes. Such traps or interceptors shall be maintained by the owner, at his or her expense, and shall be regularly cleaned and maintained for adequate performance and efficient operation at all times. Any subsequent alterations or additions to the traps or interceptors shall not be made without due notice to and approval by the City plumbing inspector. Subd. 2 Industrial Waste. With respect to the discharge or potential discharge of"industrial waste," which for purposes of this section shall be defined as any solid, liquid or gaseous waste, including cooling water, resulting from any industrial or manufacturing process or from the development, recovery or processing of natural resources, the discharger or potential discharger of the industrial waste shall be subject to the requirements and procedures of the MCES or the disposal system of plans and specifications for any and all facilities to be used in discharging the industrial waste, including meters and sampling facilities (if required), prior to construction and installation of the facilities. The City Engineer shall have first approved the metering equipment to be or being used prior to the submission of the plans to the MCES for approval. Subd. 3 Drainage Water. It shall be unlawful for any person to discharge or cause to be discharged into the municipal sanitary sewer system of the City, either directly or indirectly, any roof, storm, surface or groundwater of any type or kind. Subd. 4 Objectional Material. It shall be unlawful for any person to discharge or cause to be discharged, or for any property owner to allow the discharge of, any objectionable material, including, but not limited to, cloth, rags or similar materials, into the Municipal Sanitary Sewer System. In those cases where it can be determined that the objectionable materials are being discharged into the Municipal Sanitary Sewer System from a private sanitary sewer line, the City's Plumbing Inspector shall notify the property owner to either discontinue or cause to be discontinued the practice of discharging objectionable materials into the Municipal Sanitary Sewer System or, in the alternative, at the property owner's sole expense and cost, the property owner shall install and maintain traps, grinders, and/or interceptors within that portion of the private sanitary sewer line which connects to the Municipal Sanitary Sewer System. The notice shall be sent by certified mail. If the property owner fails to discontinue or cause to be discontinued the practice of discharging objectionable materials into the Municipal Sanitary Sewer System or fails to install and maintain traps, grinders and/or interceptors, the City may assess the costs incurred by the City for excessive maintenance or repairs to the Municipal Sanitary Sewer System, and may pursue other legal or equitable remedies against the property owner. 1010.09 Accidental Discharges. Section 5-15 of Article V of the Sewage and Waste Control Rules and Regulations for the Metropolitan Disposal System, is incorporated and adopted herein by reference and shall be applicable to any and all accidental discharges of prohibited waste into the sanitary sewer system